U.S. patent application number 16/837722 was filed with the patent office on 2020-10-08 for dropper post assembly for a bicycle.
The applicant listed for this patent is D3 Innovation Inc.. Invention is credited to Jonathan Staples.
Application Number | 20200317282 16/837722 |
Document ID | / |
Family ID | 1000005104286 |
Filed Date | 2020-10-08 |
United States Patent
Application |
20200317282 |
Kind Code |
A1 |
Staples; Jonathan |
October 8, 2020 |
DROPPER POST ASSEMBLY FOR A BICYCLE
Abstract
A dropper post assembly for supporting a bicycle seat can
include an outer tube and an inner tube telescopically receivable
in the outer tube and slidable within the outer tube between a
retracted position in which a lower end of the inner tube is
proximate a lower end of the outer tube and an extended position in
which the lower end of the inner tube is axially spaced from the
lower end of the outer tube. An actuator assembly may include an
actuator body having a mounting portion connected to the lower end
of the outer tube and a cartridge rod receiving portion, and may be
configured so that when the inner tube is in the retracted position
at least the upper surface of the cartridge rod receiving portion
is nested within the inner tube.
Inventors: |
Staples; Jonathan;
(Garibaldi Highlands, CA) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
D3 Innovation Inc. |
Squamish |
|
CA |
|
|
Family ID: |
1000005104286 |
Appl. No.: |
16/837722 |
Filed: |
April 1, 2020 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
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62830405 |
Apr 6, 2019 |
|
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62839594 |
Apr 26, 2019 |
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Current U.S.
Class: |
1/1 |
Current CPC
Class: |
B62J 1/08 20130101; B62J
2001/085 20130101 |
International
Class: |
B62J 1/08 20060101
B62J001/08 |
Claims
1. A dropper post assembly for supporting a bicycle seat, the
dropper post assembly comprising: a) an outer tube extending along
a post axis between a lower end and an upper end; b) an inner tube
telescopically receivable in the outer tube and having an upper end
that is connectable to a bicycle seat and a lower end that is
disposed within the outer tube, the lower end having a lower end
surface defining a lower plane that is substantially orthogonal to
the post axis and intersects a lowermost portion of the lower end
surface, the inner tube being axially slidable within the outer
tube between a retracted position in which the lower end of the
inner tube is proximate the lower end of the outer tube and an
extended position in which the lower end of the inner tube is
axially spaced from the lower end of the outer tube; c) an actuator
assembly comprising an actuator body having a mounting portion
connected to the lower end of the outer tube, a cartridge rod
receiving portion having a cavity extending axially from an upper
surface and configured to receive a cartridge rod containing a
translatable actuation rod, and an actuating mechanism movably
connected to the actuator body and configured to selectably
translate the actuation rod when in use, the actuator assembly
configured so that when the inner tube is in the retracted position
at least the upper surface of the cartridge rod receiving portion
is nested within the inner tube and is above the lower plane.
2. The dropper post assembly of claim 1, wherein the actuator body
comprises an axially extending channel that is configured to
movably receive the actuating mechanism and is bounded by an upper
end wall having a rod aperture that is sized to receive the
actuation rod, wherein when the inner tube is in the retracted
position the upper end wall and at least a portion of the channel
are disposed within the inner tube and above the lower plane.
3. The dropper post assembly of claim 1, wherein the actuator body
has a length in the axial direction between an axially uppermost
and axially lowermost surfaces, and wherein when the inner tube is
in the retracted position at least 10% of the length of the
actuator body is nested within the inner tube.
4. The dropper post assembly of claim 1, wherein the actuator
assembly is separable from the outer tube via a single operation
when the mounting portion is disconnected from the outer tube.
5. The dropper post assembly of claim 1, wherein the cavity of the
cartridge rod receiving portion has a laterally extending lower end
wall for abutting a lower end of the cartridge rod, and wherein
when the inner tube is in the retracted position the lower end wall
is nested within the inner tube.
6. The dropper post assembly of claim 1, further comprising a
locking spring cartridge having a cartridge outer tube disposed
within and movable with the inner tube, a cartridge rod extending
from the cartridge outer tube to a lower end that is received
within the cartridge rod receiving portion of the actuator assembly
and an actuation rod translatable within the cartridge rod to
trigger the locking spring cartridge, wherein when the inner tube
is in the retracted position the lower end of the cartridge rod is
disposed within the inner tube and above the lower plane.
7. A dropper post assembly for supporting a bicycle seat, the
dropper post assembly comprising: a) an outer tube extending along
a post axis between a lower end and an upper end; b) an inner tube
telescopically receivable in the outer tube and having an upper end
comprising an upper travel edge defining an upper plane and a lower
end that is disposed within the outer tube and comprising a lower
end surface defining a lower plane, the inner tube being axially
slidable within the outer tube between a retracted position in
which the lower end of the inner tube is proximate the lower end of
the outer tube and the lower plane is coplanar with a retraction
plane, and an extended position in which the lower end of the inner
tube is axially spaced from the retraction plane by a drop length,
a travel portion of the inner tube is exposed outside the outer
tube and a lower portion of the inner tube remains axially
overlapped within the lower tube defining an overlap length; c) a
seat clamp assembly connected to the upper end of the inner tube
and comprising first and second clamping channels configured to
retain first and second bicycle seat rails when in use, the first
and second clamping channels extending along respective first and
second channel axes that lie in a common rail plane that intersects
the post axis at a head point, and wherein a distance between the
head point and the upper plane defines a head length; and d) an
actuator assembly at the lower end of the outer tube and comprising
an actuator body having an axially uppermost surface that is
disposed above the retraction plane and an opposing axially
lowermost surface that is spaced below the retraction plane by an
effective actuator length, the actuator assembly configured so that
at least the axially uppermost surface is nested within the lower
end of the inner tube and above the lower plane when the inner tube
is in the retracted position whereby a sum of the overlap length,
the head length and the effective actuator length defines a
normalized post length that is less than about 160 mm.
8. The dropper post assembly of claim 7, wherein the normalized
post length is less than about 140 mm and wherein the overlap
length is at least 80 mm.
9. The dropper post assembly of claim 7, wherein the drop length is
between about 150 mm and about 240 mm.
10. The dropper post assembly of claim 7, wherein a sum of the
overlap length, the head length, the effective actuator length and
two times the drop length defines a total post length that is
between 400 mm and about 585 mm.
11. The dropper post assembly of claim 7, wherein the effective
actuator length is less than 40 mm.
12. The dropper post of claim 7, wherein the actuator assembly is
separable from the outer tube via a single operation when the
mounting portion is disconnected from the outer tube.
13. A dropper post assembly for supporting a bicycle seat, the
dropper post assembly comprising: a) an outer tube extending along
a post axis between a lower end and an upper end; b) an inner tube
telescopically receivable in the outer tube and having an upper end
comprising an upper travel edge defining an upper plane and a lower
end that is disposed within the outer tube and comprising a lower
end surface defining a lower plane, the inner tube being axially
slidable within the outer tube between a retracted position in
which the lower end of the inner tube is proximate the lower end of
the outer tube and the lower plane is coplanar with a retraction
plane, and an extended position in which the lower end of the inner
tube is axially spaced from the retraction plane by a drop length,
a travel portion of the inner tube is exposed outside the outer
tube and a lower portion of the inner tube remains axially
overlapped within the lower tube defining an overlap length; c) a
seat clamp assembly connected to the upper end of the inner tube
and comprising first and second clamping channels configured to
retain first and second bicycle seat rails when in use, the first
and second clamping channels extending along respective first and
second channel axes that lie in a common rail plane that intersects
the post axis at a head point, and wherein an distance between the
head point and the upper plane defines a head length; and d) an
actuator assembly at the lower end of the outer tube and comprising
an actuator body having an axially uppermost surface and an
opposing axially lower most surface that is spaced below the
retraction plane by an effective actuator length, the dropper post
assembly being configured so that a sum of the overlap length, the
head length and the effective actuator length defines a normalized
post length that is less than about 140 mm.
14. The dropper post assembly of claim 14, wherein the normalized
post length is less than about 140 mm.
15. The dropper post assembly of claim 14, wherein the drop length
is between about 150 mm and about 240 mm.
16. The dropper post assembly of claim 14, wherein a sum of the
overlap length, the head length, the effective actuator length and
two times the drop length defines a total post length that is
between 400 mm and about 585 mm.
17. The dropper post assembly of claim 14, wherein the overlap
length is at least 80 mm.
18. The dropper post assembly of claim 14, wherein the effective
actuator length is less than 40 mm.
19. The dropper post assembly of claim 14, wherein the actuator
body has a length in the axial direction between the axially
uppermost and axially lowermost surfaces, and wherein when the
inner tube is in the retracted position at least 10% of the length
of the actuator body is nested within the inner tube.
20. The dropper post assembly of claim 14, wherein the actuator
assembly is separable from the outer tube via a single operation
when the mounting portion is disconnected from the outer tube.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] The present application claims the benefit of and priority
to United States provisional patent application No. 62/830,405
filed on Apr. 6, 2019, and United States patent application No.
62/839,594 filed on Apr. 26, 2019, the entirety of which are hereby
incorporated by reference.
FIELD OF THE INVENTION
[0002] In one of its aspects, the present disclosure relates to a
bicycle seat post assembly, and in particular to a dropper post
assembly for a bicycle and an actuator assembly for controlling the
internal spring/mechanism of the dropper seat post.
INTRODUCTION
[0003] Adjustable bicycle seat posts can provide a variety of seat
height options to riders. To enable riders to adjust the height of
their seat post while riding, so-called "dropper" seat posts have
been developed. Dropper seat posts are telescopic posts that allow
the rider to change the height of their seat without having to stop
and manually adjust the mechanically tightened seat post collar. A
typical dropper seat post allows a rider to extend and retract a
portion of their seat post while in motion to provide a high and
low seat position, respectively.
[0004] Taiwan patent publication no. TW201801969 discloses a casing
gap filling structure for a bicycle seat tube, which comprises a
casing set having an outer tube and an inner tube which are sleeved
onto each other and move linearly. A rotation constraining set is
arranged between the inner tube and the outer tube and is provided
with a first constraining groove arranged on the inner diameter
edge of the outer tube and a second constraining groove arranged on
an outer diameter edge of the inner tube. The first and second
constraining grooves form a constraining space together, and at
least one constraining member made of a metal material is
accommodated in the constraining space and capable of conducting
synchronous linear displacement with the inner tube. A gap filler
set is disposed in the constraining space and provided with at
least one constraining member made of a plastic material. The gap
filler set and the metal constraining member respectively overlap
with each other in the constraining space along the axial direction
of the inner and outer tubes, and the plastic constraining member
fills the constraining space so as to eliminate the gaps among the
plastic constraining member and the first and second constraining
grooves. In this way, the rotation constraining set and the gap
filler set are used to achieve the dual function of constraining
the rotation and eliminating the gaps between the inner tube and
the outer tube at the same time. The manufacturing cost of the
filling structure is low because the overall components are simple
and easy to be assembled quickly. Further, the gaps among the
components generated by the fit tolerance and the manufacturing
tolerance are reduced with no requirement of tight rotation
actions. The automatic filling function is thus achieved and
compatible with the lifting seat tube and the suspension seat
tube.
[0005] U.S. Pat. No. 9,688,331 discloses a bicycle seat post
assembly, which includes first and second tubes that are
telescopically arranged, a fluid chamber that includes a
compressible fluid to generate a force to expand the first and
second tubes relative to each other, and a positioning structure.
The positioning structure includes a support member on one of the
first tube and the second tube, a positioning member that pivots
about an axis between a first position and a second position, a
control unit, which is connected to the positioning member to move
the positioning member between the first position and the second
position, and a position maintaining member, which is provided on
the other of the first tube and the second tube. The position
maintaining member includes an engaging portion that engages with
the positioning member to maintain a positional relationship
between the first and second tubes.
[0006] U.S. Pat. No. 8,079,772 discloses an adjustable height seat
post for bicycles that comprises an inner tube slidably contained
within an outer tube which supports a bicycle seat. The outer tube
clamps into a bicycle frame and contains a spring which acts to
force the inner tube upward. The inner tube is allowed longitudinal
movement within the fixed outer tube via a locking mechanism that
forces ball bearings into pockets or channels on the inner tube.
The locking mechanism can be remotely activated with a handlebar
mounted lever or manually with a seat post mounted lever.
[0007] US patent publication no. 2015/0232158 discloses a bicycle
seat post assembly that includes a first cylinder, a second
cylinder, and a positioning structure. The second cylinder is
configured to be telescopically received in the first cylinder. The
positioning structure is configured to relatively position the
first cylinder and the second cylinder. The positioning structure
is configured to switch a state of the bicycle seat post assembly
among a first adjustable state and a second adjustable state. In
the first adjustable state, a positional relationship between the
first cylinder and the second cylinder is continuously adjustable
within a first adjustable position range. In the second adjustable
state, the positional relationship between the first cylinder and
the second cylinder is continuously adjustable within a second
adjustable position range different from the first adjustable
position range.
SUMMARY
[0008] In recent years, "dropper" seat posts have become more
desirable. It is advantageous to lower a bicycle seat as far as
possible when riding through technical terrain to allow the rider
to change their body position or bend their knees deeply without
contacting the seat.
[0009] Shorter riders are often required to use shorter travel
dropper posts to reduce the overall length because there is less
distance between an insertion limiting feature of the seat tube and
the rails of the bicycle seat when at their preferred seat height.
This distance relates to the total length of the dropper post.
[0010] It is typical for dropper posts to be sold in a variety of
travel lengths. For example, a manufacturer may offer stock dropper
post models with travel lengths that vary by 20 mm to 25 mm with
each model (e.g., 125 mm travel, 150 mm travel, 170 mm travel,
etc.).
[0011] Despite the advances made to date in the development of
bicycle seat post assemblies, there is room for improvement to
address the above-mentioned problems and shortcomings of the prior
art.
[0012] In accordance with one broad aspect of the teachings
described herein, a dropper post assembly for supporting a bicycle
seat may include an outer tube extending along a post axis between
a lower end and an upper end. An inner tube may be telescopically
receivable in the outer tube and may have an upper end that is
connectable to a bicycle seat and a lower end that is disposed
within the outer tube. The lower end may have a lower end surface
defining a lower plane that is substantially orthogonal to the post
axis and intersects as lowermost portion of the lower end surface.
The inner tube ay be axially slidable within the outer tube between
a retracted position in which the lower end of the inner tube is
proximate the lower end of the outer tube and an extended position
in which the lower end of the inner tube is axially spaced from the
lower end of the outer tube. An actuator assembly may include an
actuator body having a mounting portion connected to the lower end
of the outer tube, a cartridge rod receiving portion having a
cavity extending axially from an upper surface and configured to
receive a cartridge rod containing a translatable actuation rod,
and an actuating mechanism movably connected to the actuator body
and configured to selectably translate the actuation rod when in
use. The actuator assembly may be configured so that when the inner
tube is in the retracted position at least the upper surface of the
cartridge rod receiving portion is nested within the inner tube and
is above the lower plane.
[0013] The actuator body may include an axially extending channel
that is configured to movably receive the actuating mechanism and
is bounded by an upper end wall having a rod aperture that is sized
to receive the actuation rod. When the inner tube is in the
retracted position the upper end wall and at least a portion of the
channel may be disposed within the inner tube and above the lower
plane.
[0014] The actuating mechanism may include an engagement member
that is movable within the channel and that includes an actuation
rod contact surface configured to bear against a lower end of the
actuation rod when in use. While the inner tube is in the retracted
position the engagement member may be movable relative to the
actuator body between a lower position in which the actuation rod
contact surface is below the lower plane and an upper position in
which the actuation rod contact surface is within the inner tube,
above the upper plane and proximate the upper end wall of the
channel.
[0015] The entire engagement member may be disposed laterally
inboard of/within the inner tube.
[0016] The actuator assembly further may include a tube stop
surface upon which the lower end surface rests when the inner tube
is in the retracted position, and the upper end wall may be spaced
axially above the tube stop surface.
[0017] The mounting portion may have a first diameter sized to
engage the outer tube and an insertable portion of the actuator
body may be disposed above the mounting portion and may have a
diameter second smaller diameter and is sized to be nested within
the inner tube. The insertable portion may include the cartridge
rod receiving portion, the upper end wall and at least a portion of
the channel.
[0018] The actuator body may have a length in the axial direction
between an axially uppermost and axially lowermost surfaces, and
when the inner tube is in the retracted position at least 10% of
the length of the actuator body may be nested within the inner
tube, or when the inner tube is in the retracted position at least
20% or at least 30% of the length of the actuator body may be
nested within the inner tube.
[0019] The actuator assembly may be separable from the outer tube
via a single operation when the mounting portion is disconnected
from the outer tube.
[0020] The mounting portion may include a threaded portion that
threadingly engages corresponding threads on an inner surface of
the outer tube. The actuator assembly may be removable from the
outer tube in a single operation by unthreading the threaded
portion from the outer tube.
[0021] The actuator body may be of integrally formed, one-piece
construction.
[0022] The cavity of the cartridge rod receiving portion may have a
laterally extending lower end wall for abutting a lower end of the
cartridge rod. When the inner tube is in the retracted position the
lower end wall may be nested within the inner tube.
[0023] When the inner tube is in the retracted position the lower
end wall may be disposed above the lower plane by least about 2
mm.
[0024] The dropper post assembly may include a locking spring
cartridge having a cartridge outer tube disposed within and movable
with the inner tube, a cartridge rod extending from the cartridge
outer tube to a lower end that is received within the cartridge rod
receiving portion of the actuator assembly and an actuation rod
translatable within the cartridge rod to trigger the locking spring
cartridge. When the inner tube is in the retracted position the
lower end of the cartridge rod may be disposed within the inner
tube and above the lower plane.
[0025] The lower end of the cartridge rod may have an end surface
that is spaced above the lower plane by about 2 mm when the inner
tube is in the retracted position.
[0026] The cavity of the cartridge rod receiving portion may extend
from the upper surface to a lower end wall that is spaced axially
from the upper surface and comprises an aperture through which the
actuation rod is translatable when in use, and wherein the actuator
assembly configured so that when the inner tube is in the retracted
position the lower end wall of the cartridge rod receiving portion
is nested within the inner tube and is above the lower plane
[0027] In accordance with another broad aspect of the teachings
described herein, a dropper post assembly for supporting a bicycle
seat may include an outer tube extending along a post axis between
a lower end and an upper end. An inner tube may be telescopically
receivable in the outer tube and may have an upper end including an
upper travel edge defining an upper plane and a lower end that is
disposed within the outer tube and comprising a lower end surface
defining a lower plane. The inner tube may be axially slidable
within the outer tube between a retracted position in which the
lower end of the inner tube is proximate the lower end of the outer
tube and the lower plane is coplanar with a retraction plane, and
an extended position in which the lower end of the inner tube is
axially spaced from the retraction plane by a drop length, a travel
portion of the inner tube is exposed outside the outer tube and a
lower portion of the inner tube remains axially overlapped within
the lower tube defining an overlap length. A seat clamp assembly
may be connected to the upper end of the inner tube and may include
first and second clamping channels configured to retain first and
second bicycle seat rails when in use. The first and second
clamping channels may extend along respective first and second
channel axes that lie in a common rail plane that intersects the
post axis at a head point. A distance between the head point and
the upper plane may define a head length. An actuator assembly may
be at the lower end of the outer tube and may include an actuator
body having an axially uppermost surface that is disposed above the
retraction plane and an opposing axially lowermost surface that is
spaced below the retraction plane by an effective actuator length.
The actuator assembly may be configured so that at least the
axially uppermost surface is nested within the lower end of the
inner tube and above the lower plane when the inner tube is in the
retracted position whereby a sum of the overlap length, the head
length and the effective actuator length defines a normalized post
length that is less than about 160 mm.
[0028] The normalized post length may be less than about 140
mm.
[0029] The drop length ay be between about 150 mm and about 240
mm.
[0030] A sum of the overlap length, the head length, the effective
actuator length and two times the drop length may defines a total
post length that is between 400 mm and about 585 mm.
[0031] The overlap length may be at least 80 mm.
[0032] The head length may be less than about 40 mm.
[0033] The effective actuator length may be less than 40 mm.
[0034] The actuator body may include: a mounting portion connected
to the lower end of the outer tube; a cartridge rod receiving
portion configured to receive a cartridge rod containing the
translatable actuation rod; and an actuating mechanism movably
connected to the actuator body and configured to selectably
translate an actuation rod when in use.
[0035] The cartridge rod receiving portion may include a cavity
extending axially from an upper surface. The actuator assembly may
be configured so that when the inner tube is in the retracted
position at least the upper surface of the cartridge rod receiving
portion is nested within the inner tube and is above the lower
plane.
[0036] The head length may be less than the effective actuator
length.
[0037] The actuator assembly may be separable from the outer tube
via a single operation when the mounting portion is disconnected
from the outer tube.
[0038] The actuator body may have a length in the axial direction
between the axially uppermost and axially lowermost surfaces. When
the inner tube is in the retracted position at least 10% of the
length of the actuator body may be nested within the inner
tube.
[0039] When the inner tube is in the retracted position at least
20% or at least 30% of the length of the actuator body may be
nested within the inner tube.
[0040] In accordance with yet another broad aspect of the teachings
described herein, a dropper post assembly for supporting a bicycle
seat may include an outer tube extending along a post axis between
a lower end and an upper end. An inner tube may be telescopically
receivable in the outer tube and may have an upper end including an
upper travel edge defining an upper plane and a lower end that is
disposed within the outer tube and comprising a lower end surface
defining a lower plane. The inner tube may be axially slidable
within the outer tube between a retracted position in which the
lower end of the inner tube is proximate the lower end of the outer
tube and the lower plane is coplanar with a retraction plane, and
an extended position in which the lower end of the inner tube is
axially spaced from the retraction plane by a drop length, a travel
portion of the inner tube is exposed outside the outer tube and a
lower portion of the inner tube remains axially overlapped within
the lower tube defining an overlap length. A seat clamp assembly
may be connected to the upper end of the inner tube and may include
first and second clamping channels configured to retain first and
second bicycle seat rails when in use. The first and second
clamping channels may extend along respective first and second
channel axes that lie in a common rail plane that intersects the
post axis at a head point. A distance between the head point and
the upper plane may define a head length. An actuator assembly may
be at the lower end of the outer tube and may include an actuator
body having an axially uppermost surface and an opposing axially
lower most surface that is spaced below the retraction plane by an
effective actuator length. The dropper post assembly may be
configured so that a sum of the overlap length, the head length and
the effective actuator length defines a normalized post length that
is less than about 140 mm.
[0041] The lower end of the inner tube may include a lower end
surface defining an lower plane and wherein the axially upper most
surface of the actuator body is disposed above the retraction plane
and the actuator body may be configured so that at least the
axially uppermost surface is nested within the lower end of the
inner tube and above the lower plane when the inner tube is in the
retracted position.
[0042] The actuator body may also include: a mounting portion
connected to the lower end of the outer tube; a cartridge rod
receiving portion configured to receive a cartridge rod containing
the translatable actuation rod; and an actuating mechanism movably
connected to the actuator body and configured to selectably
translate an actuation rod when in use.
[0043] The cartridge rod receiving portion may include a cavity
extending axially from an upper surface. The actuator assembly may
be configured so that when the inner tube is in the retracted
position at least the upper surface of the cartridge rod receiving
portion is nested within the inner tube and is above the lower
plane.
[0044] The normalized post length may be less than about 140
mm.
[0045] The drop length ay be between about 150 mm and about 240
mm.
[0046] A sum of the overlap length, the head length, the effective
actuator length and two times the drop length defines a total post
length that may be between 400 mm and about 585 mm.
[0047] The overlap length may be at least 80 mm.
[0048] The head length may be less than about 40 mm
[0049] The effective actuator length may be less than 40 mm.
[0050] The actuator body may have a length in the axial direction
between the axially uppermost and axially lowermost surfaces. When
the inner tube is in the retracted position at least 10% of the
length of the actuator body ay be nested within the inner tube.
[0051] When the inner tube is in the retracted position at least
20% or at least 30% of the length of the actuator body may be
nested within the inner tube.
[0052] The actuator assembly may be separable from the outer tube
via a single operation when the mounting portion is disconnected
from the outer tube.
[0053] The mounting portion may include a threaded portion that
threadingly engages corresponding threads on an inner surface of
the outer tube. The actuator assembly may be separable from the
outer tube in a single operation by unthreading the threaded
portion from the outer tube.
[0054] Thus, the present inventors have developed a dropper post
assembly having a relatively shorter normalized post length, and a
new design for an actuator assembly that can help facilitate the
desired arrangement between the actuator and inner tube while the
dropper post assembly is in use. This may help provide a dropper
post assembly with a smaller overall length which may allow a
dropper post to be used in variety of differently configured
bicycle frames. This may also help provide a dropper post assembly
having a desired amount of travel/drop while requiring less
space/length than a conventional dropper post when in the retracted
position and/or while still providing a post with a desired degree
of stability in the extended position. This may help riders to
better customize the maximum available drop of their seat post to
their height, bicycle frame size, and/or saddle height
requirements. To the knowledge of the inventors, a dropper post
assembly with such a combination of features is heretofore unknown.
Other advantages may become apparent to those of skill in the art
upon reviewing the present description.
BRIEF DESCRIPTION OF THE DRAWINGS
[0055] Embodiments of the present invention will be described with
reference to the accompanying drawings, wherein like reference
numerals denote like parts, and in which:
[0056] FIG. 1 is a side view of one example of a dropper post
assembly in a retracted configuration;
[0057] FIG. 2 is the dropper post assembly of FIG. 1 in an extended
configuration;
[0058] FIG. 3 is a partial cross-sectional view of the dropper post
assembly of FIG. 2;
[0059] FIG. 4 is a partially exploded view of the dropper post
assembly of FIG. 1;
[0060] FIG. 5 is a partial cross-sectional view of the dropper post
assembly of FIG. 1;
[0061] FIG. 6 is a partial cross-sectional view of the dropper post
assembly of FIG. 2;
[0062] FIG. 7 is a upper perspective view of one example of an
actuator assembly;
[0063] FIG. 8 is a lower perspective view of the actuator assembly
of FIG. 7;
[0064] FIG. 9 is an enlarged view of a lower portion of a dropper
post assembly including the actuator assembly of FIG. 7 in a first
state;
[0065] FIG. 10 is an enlarged view of a lower portion of a dropper
post assembly including the actuator assembly of FIG. 7 in a second
state;
[0066] FIG. 11 is a upper perspective view of another example of an
actuator assembly;
[0067] FIG. 12 is a lower perspective view of the actuator assembly
of FIG. 12;
[0068] FIG. 13 is an enlarged view of a lower portion of a dropper
post assembly including the actuator assembly of FIG. 11 in a first
state; assembly including the of FIG. 5; and
[0069] FIG. 14 is an enlarged view of a lower portion of a dropper
post assembly including the actuator assembly of FIG. 11 in a
second.
DETAILED DESCRIPTION
[0070] Various apparatuses or processes will be described below to
provide an example of an embodiment of each claimed invention. No
embodiment described below limits any claimed invention and any
claimed invention may cover processes or apparatuses that differ
from those described below. The claimed inventions are not limited
to apparatuses or processes having all of the features of any one
apparatus or process described below or to features common to
multiple or all of the apparatuses described below. It is possible
that an apparatus or process described below is not an embodiment
of any claimed invention. Any invention disclosed in an apparatus
or process described below that is not claimed in this document may
be the subject matter of another protective instrument, for
example, a continuing patent application, and the applicants,
inventors or owners do not intend to abandon, disclaim, or dedicate
to the public any such invention by its disclosure in this
document.
[0071] Bicycle dropper seat posts allow a rider to change the
height of their seat while riding without having to stop and adjust
a mechanically tightened seat post collar. Dropper seat posts are
available in different sizes, having different lengths of
travel/drop and different minimum and maximum seat heights. It may
be generally desirable to provide a relative high travel/drop
length while still having a dropper post assembly that feels stable
and comfortable to a rider and that can fit within the space
available within the bicycle frame. This can be related to the
total length of the dropper post assembly in its extended and
retracted positions, and can be understood to be the sum of the
upper and lower travel/drop distances (i.e., the vertical travel
distance of the post), along with an overlap length (i.e., the
length of the inner tube that remains nested within the outer tube
when in its extended configuration to help provide stability), a
head length (i.e., the distance from the top of the seat tube to
the position of the seat rails when mounted to the seat attachment
assembly) and an effective actuator length (e.g a length by which
portions of the actuator extend axially beyond the lower surface of
the inner tube). Together, these lengths can define a total length
of the dropper post assembly.
[0072] When retracted, the inner tube can be substantially nested
within the outer/lower tube but the head length, overlap length and
effective actuator length remain unchanged (i.e. are nor reduced or
nested, etc. when the post is retracted). Therefore, the sum of
these generally fixed lengths (the head length, the effective
actuator length and the overlap length) can define a normalized
post length that can, in some examples, represent a limit on how
low the bicycle seat can be positioned using a given dropper post
assembly while still providing the desired degree of travel.
Reducing this normalized post length may help accommodate a wider
variety of different riders using a given dropper post.
[0073] Shortening or reducing the normalized post length may be
done by shortening one or more of the head length, overlap length
and the effective actuator length. One way of shortening the head
length is to use a suitable attachment assembly, such as, for
example, the seat attachment assembly made and sold by OneUp
Components of British Columbia, Canada and as described in U.S.
Pat. Nos. 10,370,051 and 10,583,882 the teachings of which are
incorporated herein by reference. Another option is to shorten the
degree of overlap between the inner and outer tubes when in the
extended position, there by shortening the overlap length. However,
reducing the overlap length can reduce the stability of the inner
tube and allow more tilting of the inner post while in use. This
may reduce rider comfort and/or safety, and/or may contribute to
wear of the dropper post assembly. Preferably, the normalized post
length can be reduced while maintaining a desirable overlap
length.
[0074] In conventional dropper post designs a relatively
significant amount of the overall length comes from the portions of
the dropper actuator assembly that extend below the lower end of
the outer tube. The actuator assembly includes mechanisms that can
be triggered, either manually or through a remote mechanism like a
cable or hydraulic connection, to activate an internal cartridge or
other biasing mechanism that can cause the desired movement of the
inner tube. In many conventional designs the actuator assembly is
connected to the bottom end of the outer tube and extends
completely, or least substantially completely below the lower end
of the outer tube. Positioning conventional actuator assemblies
further within the outer tube may lead to interference between the
actuator assembly and the inner tube and/or cartridge apparatus
which could limit the amount of travel/drop of the post. The
teachings described herein are generally related to a new dropper
post assembly that can provide a desired travel/drop length while
having a relatively small, and optionally minimized normalized post
length, and to an improved actuator assembly that can be used to
help reduce the effective actuator length (optionally while still
having an overall actuator length that is comparable to
conventional actuator assemblies).
[0075] Referring to FIGS. 1-4, one example of a seat post assembly
100 that includes an upper or inner tube 110, a lower or outer tube
120, a collar assembly 130 (that can include any suitable seals,
bushings and the like) an actuator assembly 140 having an actuating
mechanism 170 and one example of a seat clamp assembly 150. FIG. 1
shows this assembly 100 with the inner tube 110 in its retracted
position and FIG. 2 shows the inner tube 110 in its extended
position.
[0076] Any suitable biasing/driving member can be provided inside
the assembly to help move the inner tube 110, and in this example
the assembly 100 includes a locking spring cartridge 160 (FIG. 4).
This locking spring cartridge 160 includes a cartridge outer tube
161, an upper connection portion 162 for attaching cartridge 160 to
upper tube 110, a cartridge rod 163, a rod attaching portion 165
which in this example includes a locking groove and a actuation rod
164 that can translate within the cartridge rod 163 to unlock the
locking spring cartridge 160 when triggered by the actuating
mechanism 170. For example, when the dropper post assembly 100 is
in use the actuating mechanism 170 may push or pull) the actuation
rod 164 to open a valve (not shown) within the cartridge 160 or to
otherwise unlock the cartridge 160. Once unlocked, relative axial
movement between the inner tube 110 and the outer tube 120 is also
possible. When the actuating mechanism 170 is relaxed/disengaged
the cartridge 160 can re-lock and relative motion between the inner
tube 110 and outer tuber 120 can be inhibited. Referring also to
FIGS. 9 and 10, in this example the rod end cap 168 of cartridge
160 is also visible in the section views and is fixedly engaged
with cartridge outer tube 161. A lower most surface 166 of the
cartridge rod 163 lies in and defines a plane C. Cartridge rod 163
slides axially through rod end cap 168 when cartridge 160 is
unlocked. Rod end cap 168 also has a lower end cap surface 169,
which lies in defines a plane E.
[0077] The cartridge outer tube 161 is shown as a separate housing
in this example, but in other examples the cartridge outer tube and
the upper tube 110 may be integrally formed with each other, and in
such instances the upper connection portion 162 may not be
required. While one example of a locking spring cartridge 160 is
described for convenience, the improved actuator assembly and other
aspects of the teachings described herein may be used in
combination with other, suitable biasing cartridges or
mechanisms.
[0078] The outer tube 120 is, in this example, an elongate, hollow
tubular member that extends along a post axis 151 between a lower
end 123 and an upper end 125. The upper end 125 as described herein
can include an upper end face of the outer tube 120 itself and can
also refer to the collar 130 and other seals, bushings and such
features provided toward the upper end 123 of the outer tube 120
that remain generally fixed with the outer tube 120 when the inner
tube 110 moves. For example, the collar 130 acts as a cap on the
upper end of the outer tube 120. In the illustrated example, the
collar 130 has threads that are configured to engage threads on the
upper end of the outer tube 120. Unthreading the collar 130 can
allow a user to access interior of the assembly 100 for maintenance
and inspection. As shown in FIG. 3, the upper edges of the collar
130 (or other uppermost, fixed feature) can define a reference
plane 127 that can be considered to define the upper limit of the
outer tube 120 for the purposes of the discussion herein.
[0079] Referring to FIGS. 2 and 3, in this example the inner tube
110 is a generally, elongate tube having an upper end 170 and an
opposing lower end 171 that are spaced apart from each other in the
direction of a post axis 151.
[0080] The lower end 171 has a lower end surface 111 that lies in
and helps define a lower plane A that is also substantially
orthogonal to the post axis 151. In the illustrated example the
lower end surface 111 is substantially planar and therefore lies
within the orthogonal plane A. In other examples the lower end
surface need not be planar or arranged in the transverse direction
as shown. In such examples plane A can be defined as a plane that
is substantially orthogonal to the post axis 151 and that
intersects the lowermost portion of the lower end surface of the
inner tube 110 (or structures attached to and movable therewith as
described herein). The plane A is intended to represent the
elevation of the lowermost portion of the movable, inner tube 110
that would be the portion most likely to contact an obstruction or
object that was located within the outer tube 120 and in the travel
path of the inner tube 110. That is, the plane A can still be
applied to structures and used as a reference point as described
herein even when an embodiment of the assembly 100 has variations
in the shape and configuration of the lower end of the inner tube
110. An axial distance between the upper plane 174 and lower plane
A can define an inner post length that can be between about 175 mm
and about 330 mm. The inner post length remains fixed while the
dropper post assembly 100 is in use.
[0081] While the lower end 171 of the inner tube 110 is shown as
simply being an integral part of the tube 110 it may alternatively,
in other embodiments, include some additional pieces or members
that can be attached to the tube and may have slightly different
shapes or configurations--but which are attached to and move with
the inner tube 110 as it moves between extended and retracted
positions. For the purposes of the discussion herein, the plane A
is intended to represent the plane containing the lower most,
movable portion of the assembly 100 that translates with the inner
tube 110 and would be likely to contact or interfere with objects
positioned within the lower end of the outer tube 120. That is,
while lower end surface 111 is shown as being a portion of the tube
itself in this example, in other examples the lower end surface 111
may be provided by the lowermost portion of any such attachment or
other member connected to the inner tube 110 and references to the
lower end surface 111 and plane A are intended to cover such
arrangements.
[0082] The upper end 170 of the inner tube 110 can, like the upper
end of the outer tube 120, include a variety of structures or other
members (in addition to just a length of tube) such as attachment
apparatus for connecting to and supporting the seat clamp assembly
150. Some of these features may extend into the or beyond the upper
end of the inner tube 110 and are translatable with the inner tube
110 as it moves. For the purposes of the discussion herein the
portion of the inner tube 110 that telescopes within the lower tube
120 (e.g. is at or below plane 127 when the inner tube 110 is
retracted) can be considered to be the travel or drop portion of
the inner tube 110. The upper edge of the travel portion of the
inner tube can include an upper travel edge 173 that can be an end
surface of the inner tube 110 itself, a location along the edge or
sidewall of the inner tube 110 and/or a portion or surface on
another component mounted to the inner tube 110. For the purposes
of the discussion herein, this upper travel edge 173 can be
considered to lie in and helps define an upper plane 174 that is
generally orthogonal to the post axis 151. When the inner tube 110
is retracted the upper plane 174 may be substantially co-planar
with plane 127, and when the inner tube 110 is extended the upper
plane 174 is spaced from the plane 127 by the drop length 175 (FIG.
3 and described further herein). The upper end 170 is also
configured to be connected to a suitable seat clamp assembly
150.
[0083] When the inner tube 110 is in the retracted position (FIGS.
1 and 5) the sidewall of the inner tube 110 is almost entirely
received within the outer tube 120 and the lower end surface 111
can reach its lowermost, or fully retracted position, such that
further retraction of the inner tube 111 is inhibited. In the
illustrated example, movement of the inner tube 110 is stopped when
the lower end surface 111 contacts and bears against a tube stop
surface 146 which is also at the lower end of the outer tube 120.
The tube stop surface 146 can be any suitable surface and is, in
this example provided by a gasket member that is supported on the
actuator assembly 140. Alternatively, the tube stop surface may be
integrally formed with the actuator assembly 140, may be provided
as part of the outer tube 120 or may be provided as a separate
member. Optionally, instead of being positioned at the lower end of
the outer tube 120 to contact the lower end surface 111, other
embodiments of the tube stop surface may be provided in other
locations within the assembly 100 and may contact other portions of
the inner tube 110 or other suitable structure in order to help
stop the inward translation of the inner tube 110. That is, the
tube stop surface need not contact the lower end surface 111 as
shown, and instead may contact another portion of the inner tube
110 (for example, toward the upper end of the inner tube).
[0084] Regardless of the configuration of the tube stop surface
and/or which portion of the inner tube 110 it contacts, the
location of the plane A when the inner tube 110 is in its fully
retracted defines the position of a retraction plane F (FIG. 3).
That is, when the inner tube 110 is fully retracted, as shown in
FIGS. 9 and 10, the plane A and F are co-planar, and when the inner
tube 110 is extended as shown in FIG. 3, plane A can be located at
the lower end surface 111 and is spaced from plane F.
[0085] When the inner tube 110 is in the extended position (FIGS.
2, 3 and 6) the lower end surface 111 is axially spaced apart from
the tube stop surface 146 by a distance 175 that is the travel/
drop length for the dropper post assembly 100. In this position an
upper, travel portion of the inner tube 110 is exposed above the
outer tube 120 by the same distance 175 (shown as the distance
between planes 127 and 174), which represents the change in height
of the bicycle seat when the dropper post assembly 100 is
activated. This drop length 175 can vary with differently sized/
configured examples of the assembly 100, but may be between about
80 mm and about 260 mm, between about 110 mm and about and 250 mm
and preferably may be between about 150 mm and about 240 mm.
[0086] To help keep the inner tube 110 stable a lower portion of
the inner tube 110 remains nested within the lower tube 120 and/or
collar 130 (e.g. below plane 127) when the inner tube 110 is
extended. This nested portion of the inner tube 110 defines an
overlap length 176 that is shown in this example as being the axial
distance between planes A and 127 (e.g. the non-exposed portion of
the inner tube 110). The overlap length can vary with differently
sized/configured examples of the assembly 100, but may be between
at least 60 mm and 120 mm and may be between about 70 mm and about
110 mm, and preferably may be at least about 80 mm. In general,
increasing the overlap length 176 may help increase the stability
of the inner tube 110 when extended, which may reduce wear and/or
increase rider comfort.
[0087] Referring also to FIGS. 7-10 the actuator assembly 140 has
an actuator body 143 that in this example is formed from two
individual parts 143a and 143b that are joined together so that
when in use with the assembly 100 the body behaves as a single
piece, and can be attached and detached from the lower tube 120 as
a single unit--without having to separate parts 143a and 143b.
Alternatively, the body 143 may be formed of more than two parts or
may be of integral, one piece construction (as described
herein)
[0088] The body 143 includes a mounting portion 141 which in this
example includes external threads that extend around the perimeter
of the body 143. The threads of the mounting portion 141 can engage
complementary threads 121 on an inner surface of the outer tube
120. In this arrangement the actuator assembly 140 is separable
from the outer tube via a single operation (e.g. unthreading) and
in one piece (e.g. without requiring disassembly) when the mounting
portion 141 is disconnected from the outer tube 120. In other
examples, the mounting portion 141 may include any type of
apparatus that can engage with a complementary portion of the outer
tube 120 or other suitable member, and may include fasteners,
circlips, clips, a press fit, deformation fit or the like. The
region of the body 143 that is above the mounting portion 141 has,
in this example been configured to provide a shoulder to
accommodate and support a cushioning member 144 (FIG. 5) which
serves as the upwardly facing tube stop surface 146. In this
arrangement, the tube stop surface 146 is removable from the lower
tube 120 with the actuator assembly 140.
[0089] The actuator body 143 also includes a cartridge rod
receiving portion 147 that is configured to attach the cartridge
rod 163 to the actuator body 143. The cartridge rod receiving
portion 147 may have any configuration that is suitable for
attaching to a given cartridge rod 163 that is used in the assembly
100. In this example the cartridge rod receiving portion 147
includes an axially oriented cavity 182 that extends from an
aperture 183 that is provided in an upper end surface 149 of the
body portion which, in this example includes the upper most surface
of the actuator assembly 140. The aperture 183 is sized to
accommodate the end of the cartridge rod 163. The cavity 182
extends to an opposing lower end wall 184 that includes a rod
aperture 185, which is sized to allow the tip of the actuation rod
164 to pass through. The cartridge rod 163 can be coupled to the
actuator body 143 using any suitable technique, and in this example
is secured in place using fasteners in the form of bolts 145a and
145b which, when installed as shown interact with a locking groove
165 that is provided on the cartridge rod 163. Other methods,
including threaded connections, press fit, deformation fit, clips,
adhesives and the like may be used in other examples.
[0090] The actuator assembly 140 also includes the actuating
mechanism 170 which includes, in this example a slidable plunger
171 having a dynamic cable stop surface 177 and that supports and
drives an engagement member 172 in the form of a plate having an
actuation rod contact surface 178 that bears against an opposing
contact surface that is provided on the tip of the actuation rod
164. When the plunger 171 is extended, the plate 172 moves
downwardly (as illustrated in FIG. 9) and the actuation rod 164 can
also move down. This example of the actuator mechanism 170 uses a
cable and housing arrangement (not shown) to lower the distance
between static cable stop surface 142 of body portion 143b and
dynamic cable stop surface 177 of plunger 171. Lowering the
distance between cable stops 177 and 142 moves plunger 171 and
plate 172 upward. Actuation rod contact surface 178 pushes
actuation rod 164 upward, thereby opening the cartridge valve (not
shown). FIG. 8 shows actuator mechanism 170 in a relaxed position.
FIG. 9 shows actuator mechanism assembly 170 in an actuated
position. In this example, the actuation rod contact surface 178
provides the upper most surface of the actuating mechanism 170 and
defines plane B in FIGS. 9 and 10. A lower most surface 186 of the
actuator assembly 140 defines a plane G (FIG. 3).
[0091] To help accommodate the movement of the actuating mechanism
170 this example of the actuator assembly 140 also includes an
axially extending recess or channel 187 that is configured to
receive the actuating mechanism 170. In this example the channel
187 is bounded by an upper end wall that coincides with the lower
end wall 184 and is in communication with the rod aperture 185.
[0092] To help reduce the normalized post length of the assembly
100, the actuator assembly 140 is configured so that at least a
portion of the actuator assembly 140 is disposed within the lower
end of the outer tube 120 and is sized (e.g. has a diameter 187
that is less than in internal diameter of the inner tube 110) so
that it can be nested within the interior of the inner tube 110
when the inner tube 110 is retracted and the lower end surface 111
is resting on the tube stop surface 146. Other portions, such as
the mounting portion 141 can have a different, larger diameter so
that they can engage the larger, outer tube 120. In this
arrangement, the length of the actuator assembly 140 that extends
below the tube stop surface 146, and therefore contributes to
normalized post length is illustrated as the effective actuator
length 188 in FIG. 3. The actuator body 143 may also define a body
length in the axial direction that is measured between planes D and
G.
[0093] Increasing the amount of the actuator assembly 140 that can
be nested within the inner tube 110 may help reduce the effective
actuator length 188 (measured from plane F to surface 186), but it
may be desirable in some embodiments to have at least some of the
actuator assembly 140 exposed and extending below the lower end of
the outer tube 120 to help facilitate connection of the activation
cable. Preferably, the actuator assembly 140 can be configured so
that the effective actuator length 188 is less than about 50 mm,
may be less than about 35 mm and may be less than about 30 mm, less
than about 25 mm and/or less than about 20 mm.
[0094] To help provide the desired nesting, the actuator assembly
140 is configured so that the portions provided above the mounting
portion 141 and tube stop surface 146 are sized to fit within the
inner diameter of the inner tube 110. Preferably, at least the
upper end surface 149 and end wall of the cartridge receiving
portion 147 can be nested within the inner tube 110 and located
above the lower plane A when the inner tube 110 is retracted.
Optionally, the actuator assembly 140 can be configured so that at
least 10%, at least 20%, at least 30%, at least 40%, at least 50%
or more of the actuator body length can be nested within the inner
tube 110 when it is retracted. For example, optionally, the entire
cartridge rod receiving portion 147 can be nested within the inner
tube 110 and located above the lower plane A when the inner tube
110 is retracted, including the end wall 184 and rod aperture 185
along with portions of the channel 187 (while a lower portion of
the channel extends below plane A). The lower end wall 184, and the
lower end surface 166 of the cartridge rod 163 may be positioned so
that it is above the lower plane A by at least about 1 mm, about 2
mm, about 3 mm, about 5 mm or more when the inner tube 110 is
retracted.
[0095] When the inner tube 110 is in its retracted position in his
example, as shown in FIGS. 9 and 10, entire cartridge rod receiving
portion 147 along with the lower end of the cartridge rod 163 and
actuation rod 164 are all nested within the inner tube 110 and
above plane A when the inner tube 110 is retracted. In this
arrangement, as shown, planes C, D, and E are all disposed above
plane A when in the retracted position.
[0096] Whether plane B and the plate 172 are disposed above plane A
can depend on the state of the actuating mechanism 170. In this
example when the actuating mechanism 170 is in the relaxed position
of FIG. 8 the plate 172 is outside the inner tube 110 and plane B
is below plane A. This example of the actuator assembly 140 allows
the actuating mechanism 170 changed from its relaxed position to
its actuated position of FIG. 10 with the inner tube 110 retracted,
thereby moving both plate 172 and plane B above plane A. In this
example the channel 187 and the engagement member 172 are sized so
that they are disposed laterally inboard of the inner tube (i.e.
within a projection of the cross-sectional area of the inner tube
110) which can help facilitate the desired movement of the
engagement member 172 independent of the position of the inner tube
110.
[0097] Referring again to FIGS. 3 and 4, the seat clamp assembly
150 in this example includes a pair of clamping channels 190 that
each extend along respective channel axis 191. The channels 190 are
sized to receive the seat rails of a standard bicycle seat, with
the channel axes 191 being aligned with the seat rails when
installed. The axes 191 are parallel to each other and lie in a
common rail plane 192 (FIG. 3). The rail plane 192 may be inclined
relative to the post axis 151 and will intersect the post axis 151
at a head point 193. The axial distance between the head point 193
and the plane 174 defines a head length 194, that can be less than
about 50 mm, less than about 40 mm, less than about 30 mm or less
than about 25 mm, and may be about 24 mm. Like the overlap length
176 and effective actuator length 188, the head length 194 remains
fixed while the assembly 100 is in use and contributes to the
normalized post length of the assembly 100. The head length 194 is,
in this example, less than the effective actuator length 188 and
overlap length 176.
[0098] Preferably, the assembly 100 is configured, such as by
configuring the seat clamp assembly to reduce the head length 194,
configuring the actuator assembly 140 to reduce the effective
actuator length 188 and/or modifying the overlap length 176, so
that normalized post length is less than about 160 mm, and
preferably is less than about 150 mm, about 140 mm, about 130 mm,
about 120 mm, about 110 mm or less. Preferably, this reduction in
the normalized post length can be achieved while still providing a
standard sized post assembly and providing a drop/travel length
that is preferably at least 90 mm, at least 120 mm, at least 150
mm, at least 180 mm, at least 210 mm, at least 240 mm or more. This
may provide an assembly in which a sum of the overlap length, the
head length, the effective actuator length and two times the drop
length defines a total post length that is between 300 mm or about
400 mm and about 585 mm, while still having a relatively small
normalized post length of less than about 160 mm or less than about
140 mm.
[0099] Referring now to FIGS. 11-14, another example of an actuator
assembly 240 that is useable with the dropper post assembly 100 is
shown. The actuator assembly 240 is generally analogous to actuator
assembly 240 and like features are annotated using like reference
characters indexed by 100. In this example the actuator assembly
140 has a body portion 243, a cartridge rod receiving portion 247
for receiving the cartridge rod 263. The rod 263 is fastened to the
body portion 243 via a threaded connection 245 (instead of bolts
145a, 145b). A tube stop surfaced 246 is provided next to the
mounting portion 241. The rod end cap 268 of cartridge 260 is also
visible and is fixedly engaged with cartridge outer tube 261. Rod
263 slides axially through rod end cap 268 when cartridge 260 is
unlocked. Rod end cap 268 also has a lower end cap surface 269.
[0100] The actuator assembly 240 has an actuator body 243 that in
this example is of integrally formed, one-piece construction. The
body 243 includes a mounting portion 241 which in this example is
configured to be engaged and retained using a circlip, rather than
including a threaded connection. In this arrangement the actuator
assembly 240 is separable from the outer tube via a single
operation (e.g. removing the circlip) and in one piece (e.g.
without requiring disassembly) when the mounting portion 241 is
disconnected from the outer tube 220. The region of the body 243
that is above the mounting portion 241 has, in this example been
configured to provide a shoulder to accommodate and support a
cushioning member which serves as the upwardly facing tube stop
surface 246. In this arrangement, the tube stop surface 246 is
removable from the lower tube 220 with the actuator assembly
240.
[0101] The actuator body 243 also includes a cartridge rod
receiving portion 247 that is configured to attach the cartridge
rod 263 to the actuator body 243. In this example the cartridge rod
receiving portion 247 includes an axially oriented cavity 282 that
extends from an aperture 283 that is provided in an upper end
surface 249 of the body portion which, in this example includes the
upper most surface of the actuator assembly 240. The aperture 183
is sized to accommodate the end of the cartridge rod 263. The
cavity 282 extends to an opposing lower end wall 284 that includes
a rod aperture 285, which is sized to allow the tip of the
actuation rod 264 to pass through. The cartridge rod 263 is
threaded into the cavity 282.
[0102] The actuator assembly 240 also includes the actuating
mechanism 270 which includes a lower arm 271 with dynamic cable
stop surface 277, an engagement member 272 in the form of the upper
arm that includes the actuation rod contact surface 278, pivot pins
273 and 274 and alignment pin 275. Actuator mechanism 270 uses a
cable and housing arrangement (not shown) to lower the distance
between static cable stop surface 242 of body 243 and dynamic cable
stop surface 277 of lower arm 271. Lowering the distance between
cable stops 277 and 242 pivots lower arm 271 about pin 273 thereby
pushing upper arm 272 upward while it pivots about pin 274. Upper
arm 272 is aligned to body 243 by alignment pin 275. Actuation rod
contact surface 278 pushes actuation rod 264 upward, thereby
opening the cartridge valve (not shown). FIG. 13 shows actuator
mechanism assembly 270 in a relaxed position. FIG. 14 shows
actuator mechanism 270 in an actuated position. Like actuator
mechanism 170, the engagement member 272 can be operated while the
inner tube 110 is retracted, such that the plane B may be above or
below plane A depending on the state of the actuator. In this
example the channel 287 and engagement member 272 are laterally
inboard the inner tube 110.
[0103] To help accommodate the movement of the actuating mechanism
270 this example of the actuator assembly 240 also includes an
axially extending recess or channel 287 that is configured to
receive the actuating mechanism 270. In this example the channel
287 is bounded by an upper end wall that coincides with the lower
end wall 284 and is in communication with the rod aperture 285.
[0104] To help reduce the normalized post length of the assembly
100, the actuator assembly 240 is configured so that at least a
portion of the actuator assembly 240 is disposed within the lower
end of the outer tube 120 and is sized so that it can be nested
within the interior of the inner tube 110 when the inner tube 110
is retracted and the lower end surface 111 is resting on the tube
stop surface 246. Other portions, such as the mounting portion 241
can have a different, larger diameter so that they can engage the
larger, outer tube 120. In this arrangement, the length of the
actuator assembly 240 that extends below the tube stop surface 246,
and therefore contributes to normalized post length is illustrated
as the effective actuator length. The actuator body 243 may also
define a body length in the axial direction that is measured
between planes D and G.
[0105] When the inner tube 110 is in its retracted position in his
example, as shown in FIGS. 13 and 14, entire cartridge rod
receiving portion 247 along with the lower end of the cartridge rod
263 and actuation rod 264 are all nested within the inner tube 110
and above plane A when the inner tube 110 is retracted. In this
arrangement, as shown, planes C, D, and E are all disposed above
plane A when in the retracted position.
[0106] While this invention has been described with reference to
illustrative embodiments and examples, the description is not
intended to be construed in a limiting sense. Thus, various
modifications of the illustrative embodiments, as well as other
embodiments of the invention, will be apparent to persons skilled
in the art upon reference to this description. It is therefore
contemplated that the appended claims will cover any such
modifications or embodiments.
[0107] All publications, patents and patent applications referred
to herein are incorporated by reference in their entirety to the
same extent as if each individual publication, patent, or patent
application was specifically and individually indicated to be
incorporated by reference in its entirety.
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