U.S. patent application number 11/083436 was filed with the patent office on 2006-10-05 for chair control device.
Invention is credited to Ing Chong Kwa.
Application Number | 20060220431 11/083436 |
Document ID | / |
Family ID | 37054322 |
Filed Date | 2006-10-05 |
United States Patent
Application |
20060220431 |
Kind Code |
A1 |
Kwa; Ing Chong |
October 5, 2006 |
Chair control device
Abstract
A mechanism is provided for an office chair to adjust the tilt
of the seat portion relative to the base of the chair. The
mechanism includes an adjustable member tiltably mounted on a base,
a compression spring bearing on the adjustable member and connected
to the base using a retaining bolt running through the center of
the compression spring, and a clutch device fixably attached to the
base extending to the adjustable member, which clutch device is
capable of holding the adjustable member in a fixed position
relative to the base.
Inventors: |
Kwa; Ing Chong; (Monrovia,
CA) |
Correspondence
Address: |
CHRISTIE, PARKER & HALE, LLP
PO BOX 7068
PASADENA
CA
91109-7068
US
|
Family ID: |
37054322 |
Appl. No.: |
11/083436 |
Filed: |
March 17, 2005 |
Current U.S.
Class: |
297/374 |
Current CPC
Class: |
A47C 1/027 20130101 |
Class at
Publication: |
297/374 |
International
Class: |
A47C 1/027 20060101
A47C001/027 |
Claims
1. An adjustment mechanism for a chair, the mechanism comprising: a
base; an adjustable member tiltably mounted on the base and
moveable between a first position and a second position; a
compression spring bearing on the adjustable member which urges the
adjustable member toward the first position when compressed; and a
clutch attached to the base and the adjustable member capable of
engaging to hold the adjustable member in a fixed position relative
to the base between or including the first position and the second
position.
2. The adjustment mechanism of claim 1, further comprising a manual
adjustment device bearing on the compression spring and a retaining
member passing thorough the compression spring, wherein the
retaining member is held in tension between the manual adjustment
device and the base.
3. The adjustment mechanism of claim 1, wherein the base comprises
a central plate and a pair of sidewalls extending substantially
perpendicularly downward from the central plate, the pair of
sidewalls being substantially parallel to one another.
4. The adjustment mechanism chair of claim 3, further comprising a
shroud attached to the base below the adjustable member, wherein
the shroud at least partially covers the adjustable member to
reduce the risk to a user of a user's finger being caught between
the adjustable member and the base.
5. The adjustment mechanism chair of claim 1, further comprising a
slider having an abutment thereon mounted on the base which may be
slid into a blocking position to prevent the adjustable member from
reaching the first position.
6. The adjustment mechanism of claim 3, further comprising a seat
connected above and to the base and a support connected below and
to the adjustable member, wherein moving the adjustable member to
the first position causes the seat to assume an upright position
relative to the support, and wherein moving the adjustable member
to the second position causes the seat to assume a reclined
position relative to the support.
7. An adjustment mechanism for a chair, the mechanism comprising: a
base; an adjustable member tiltably mounted on the base and
moveable between a first position and a second position; an elastic
element bearing on the adjustable member which urges the adjustable
member toward the first position when deformed; and a clutch
comprising a clutch lever mounted on the base and a clutch assembly
attached to the adjustable member, wherein the clutch assembly
connects the clutch lever and the adjustable member, and wherein
the clutch is capable of engaging to hold the adjustable member in
a fixed position relative to the base between or including the
first position and the second position.
8. The adjustment mechanism of claim 7, wherein the elastic element
is a compression spring.
9. The adjustment mechanism of claim 8, further comprising a manual
adjustment device bearing on the compression spring and a retaining
member passing thorough the compression spring, wherein the
retaining member is held in tension between the manual adjustment
device and the base.
10. The adjustment mechanism of claim 7, wherein the clutch lever
is tiltably mounted on the base and may be operated to disengage a
spring loaded bracket.
11. The adjustment mechanism chair of claim 7, further comprising a
slider having an abutment thereon mounted on the base which may be
slid into a blocking position to prevent the adjustable member from
reaching the first position.
12. The adjustment mechanism of claim 7, wherein the base comprises
a central plate and a pair of sidewalls extending substantially
perpendicularly downward from the central plate, the pair of
sidewalls being substantially parallel to one another.
13. The adjustment mechanism chair of claim 12, further comprising
a shroud attached to the base below the adjustable member, wherein
the shroud at least partially covers the adjustable member to
reduce the risk to a user of a user's finger being caught between
the adjustable member and the base.
14. The adjustment mechanism of claim 12, further comprising a seat
connected above and to the base and a support connected below and
to the adjustable member, wherein moving the adjustable member to
the first position causes the seat to assume an upright position
relative to the support, and wherein moving the adjustable member
to the second position causes the seat to assume a reclined
position relative to the support.
15. The adjustment mechanism of claim 7, wherein the clutch
assembly comprises at least one clutch plate and a clutch pin, and
wherein when the clutch lever is operated to disengage a spring
loaded bracket, the at least one clutch plate is released to move
relative to the clutch pin which in turn releases the clutch
assembly to move relative to the base.
16. The adjustment mechanism of claim 15, wherein the clutch
assembly is attached to the adjustable member at a pivot point
lying between the clutch pin and the central plate of the base.
17. The adjustment mechanism of claim 16, wherein the pivot point
is provided below the central plate of the base and above the pivot
pin of the clutch assembly.
18. An adjustment mechanism for a chair, the mechanism comprising:
a base comprising a first central plate and a first pair of
sidewalls extending substantially perpendicularly downward from the
first central plate, the first pair of sidewalls being
substantially parallel to one another; an adjustable member
tiltably mounted on the base below the first central plate moveable
between a first position and a second position; an elastic element
provided below the adjustable member and the first central plate of
the base which bears on the adjustable member and urges the
adjustable member toward the first position when deformed; and a
clutch attached to the base and the adjustable member capable of
engaging to hold the adjustable member in a fixed position relative
to the base between or including the first position and the second
position.
19. The adjustment mechanism of claim 18, wherein the elastic
element is a compression spring.
20. The adjustment mechanism of claim 19, further comprising a
manual adjustment device bearing on the compression spring and a
retaining member passing thorough the compression spring, wherein
the retaining member is held in tension between the manual
adjustment device and the base.
21. The adjustment mechanism chair of claim 18, further comprising
a shroud attached to the base below the adjustable member, wherein
the shroud at least partially covers the adjustable member to
reduce the risk to a user of a user's finger being caught between
the adjustable member and the base.
22. The adjustment mechanism chair of claim 18, further comprising
a slider having an abutment thereon mounted on the base which may
be slid into a blocking position to prevent the adjustable member
from reaching the first position.
23. The adjustment mechanism of claim 18, further comprising a seat
connected above and to the base and a support connected below and
to the adjustable member, wherein moving the adjustable member to
the first position causes the seat to assume an upright position
relative to the support, and wherein moving the adjustable member
to the second position causes the seat to assume a reclined
position relative to the support.
24. An adjustment mechanism for a chair, the mechanism comprising:
a base comprising a first central plate and a first pair of
sidewalls extending substantially perpendicularly downward from the
first central plate, the first pair of sidewalls being
substantially parallel to one another; an adjustable member
moveable between a first position and a second position which is
tiltably mounted on the base, and which comprises a second central
plate, a column mount and a second pair of sidewalls extending
substantially perpendicularly downward from the second central
plate to the column mount, the second pair of sidewalls being
substantially parallel to one another; an elastic element bearing
on the adjustable member which urges the adjustable member toward
the first position when deformed; and a clutch attached to the base
and the adjustable member capable of engaging to hold the
adjustable member in a fixed position relative to the base between
or including the first position and the second position.
25. The adjustment mechanism of claim 24, wherein a passage is
provided through the adjustable member defined by the column
support, the first pair of sidewalls and the second central
plate.
26. The adjustment mechanism of claim 24, wherein the adjustable
member further comprises reinforcing flanges extending downward
from the second central plate to reinforce the second central
plate.
27. The adjustment mechanism of claim 24, wherein the elastic
element is a compression spring.
28. The adjustment mechanism of claim 27, further comprising a
manual adjustment device bearing on the compression spring and a
retaining member passing thorough the compression spring, wherein
the retaining member is held in tension between the manual
adjustment device and the base.
29. The adjustment mechanism chair of claim 24, further comprising
a shroud attached to the base below the adjustable member, wherein
the shroud at least partially covers the adjustable member to
reduce the risk to a user of a user's finger being caught between
the adjustable member and the base.
30. The adjustment mechanism chair of claim 24, further comprising
a slider having an abutment thereon mounted on the base which may
be slid into a blocking position to prevent the adjustable member
from reaching the first position.
31. The adjustment mechanism of claim 24, further comprising a seat
connected above and to the base and a support connected below and
to the adjustable member, wherein moving the adjustable member to
the first position causes the seat to assume an upright position
relative to the support, and wherein moving the adjustable member
to the second position causes the seat to assume a reclined
position relative to the support.
Description
FIELD OF THE INVENTION
[0001] The present invention relates to an adjustment mechanism for
a chair allowing relative displacement of two chair parts. In an
exemplary embodiment, the invention provides a seat tilt and
locking device.
BACKGROUND
[0002] It is typical in office chairs for the seat to tilt
rearwardly as an occupant leans back in the seat. To accommodate
this motion, known chair control devices allow a seat portion of a
chair to tilt in relation to its wheeled support. These chair
control devices are provided with an adjustable spring to
counteract the rearward force exerted on the chair by the user,
which force will ordinarily cause the chair to return to an upright
position when unoccupied. This adjustable spring may be
pretensioned by a user to a greater or lesser degree to cause the
spring to exert a greater or lesser reaction force to the rearward
force supplied by the user.
[0003] Sophisticated chair control devices are known which, in
addition to having an adjustable spring, incorporate a clutch
assembly which allows a user to lock the chair in any reclined or
upright position throughout its range of motion. Simpler devices
are also known which have a tilt lock mechanism which merely
prevents the chair from righting itself when in a reclined position
and/or locks the chair in an upright position.
[0004] The more sophisticated chair control devices which
incorporate the clutch assembly feature are far more expensive and
complicated to manufacture than the simpler tilt lock mechanisms.
This is due to certain design considerations, because of which it
has been necessary in the past to use an expensive tilt assembly
and torsion spring in devices featuring both an adjustable
pretensioned spring for counteracting the tilt force exerted by a
user and a clutch assembly for locking in a tilt position.
SUMMARY OF THE INVENTION
[0005] In an exemplary embodiment, an adjustment mechanism for a
chair comprises a base, an adjustable member tiltably mounted on
the base and moveable between a first position and a second
position, a compression spring bearing on the adjustable member
which urges the adjustable member toward the first position when
compressed and a clutch attached to the base and the adjustable
member capable of engaging to hold the adjustable member in a fixed
position relative to the base between or including the first
position and the second position.
[0006] In another embodiment, an adjustment mechanism for a chair
comprises a base, an adjustable member tiltably mounted on the base
and moveable between a first position and a second position, an
elastic element bearing on the adjustable member which urges the
adjustable member toward the first position when deformed, and a
clutch comprising a clutch lever mounted on the base and a clutch
assembly attached to the adjustable member. The clutch assembly
connects the clutch lever and the adjustable member, and the clutch
is capable of engaging to hold the adjustable member in a fixed
position relative to the base between or including the first
position and the second position.
[0007] In yet another embodiment, an adjustment mechanism for a
chair comprises a base comprising a first central plate and a first
pair of sidewalls extending substantially perpendicularly downward
from the first central plate, the first pair of sidewalls being
substantially parallel to one another, an adjustable member
tiltably mounted on the base below the first central plate moveable
between a first position and a second position, an elastic element
provided below the adjustable member and the first central plate of
the base which bears on the adjustable member and urges the
adjustable member toward the first position when deformed, and a
clutch attached to the base and the adjustable member capable of
engaging to hold the adjustable member in a fixed position relative
to the base between or including the first position and the second
position.
[0008] In yet another embodiment, an adjustment mechanism for a
chair comprises a base comprising a first central plate and a first
pair of sidewalls extending substantially perpendicularly downward
from the first central plate, the first pair of sidewalls being
substantially parallel to one another, an adjustable member
moveable between a first position and a second position which is
tiltably mounted on the base, and which comprises a second central
plate, a column mount and a second pair of sidewalls extending
substantially perpendicularly downward from the second central
plate to the column mount, the second pair of sidewalls being
substantially parallel to one another, an elastic element bearing
on the adjustable member which urges the adjustable member toward
the first position when deformed, and a clutch attached to the base
and the adjustable member capable of engaging to hold the
adjustable member in a fixed position relative to the base between
or including the first position and the second position.
BRIEF DESCRIPTION OF THE DRAWINGS
[0009] FIG. 1 shows a conventional tilt mechanism for use with a
chair control device;
[0010] FIG. 2 shows another conventional tilt mechanism for use
with a chair control device;
[0011] FIG. 3 shows an exemplary embodiment of a tilt mechanism for
use the present chair control device;
[0012] FIG. 4 shows perspective view of an exemplary embodiment of
a chair control device wherein the tilt mechanism is concealed
beneath a shroud;
[0013] FIG. 5 shows another perspective view of the chair control
device of FIG. 4 wherein the shroud has been removed;
[0014] FIG. 6 shows an overhead view of the chair control device of
FIG. 5;
[0015] FIG. 7 depicts outlines of an embodiment of the present tilt
mechanism in both the reclined and upright positions;
[0016] FIG. 8 shows a side view of an exemplary embodiment of a
tilt mechanism;
[0017] FIG. 9 shows an overhead view of the tilt mechanism of FIG.
8;
[0018] FIG. 10A depicts detail 1 of FIG. 8;
[0019] FIG. 10B shows an end view of the tilt mechanism of FIG.
8;
[0020] FIG. 11 shows an overhead view of an exemplary embodiment of
a base of a chair control device;
[0021] FIG. 12 shows a side view of the base of FIG. 11;
[0022] FIG. 13 shows an end view of the base of FIG. 11;
[0023] FIG. 14A depicts detail 1 of FIG. 11;
[0024] FIG. 14B depicts section B-B of FIG. 11;
[0025] FIG. 14C depicts section A-A of FIG. 11;
[0026] FIG. 15A shows a top view of one embodiment of a tilt clutch
bracket;
[0027] FIG. 15B shows a side view of the tilt clutch bracket of
FIG. 15A; and
[0028] FIG. 15C depicts detail 2 of FIG. 12.
[0029] Before any embodiment of the invention is explained in
detail, it is to be understood that the invention is not limited in
its application to the details of construction and arrangements of
components set forth in the following description, or illustrated
in the drawings. The invention is capable of alternative
embodiments and of being practiced or being carried out in various
ways. Specifically, numerical dimensions, where they appear on the
following drawings, represent those of exemplary embodiments only
and may be modified by one skilled in the art as conditions
warrant. Also, it is to be understood that the terminology used
herein is for the purpose of illustrative description and should
not be regarded as limiting.
DETAILED DESCRIPTION
[0030] FIG. 1 shows a conventional tilt mechanism for use with a
chair control device. This device, known in the art as a "tilt
lock" device, comprises a tilt mechanism 10 pivotably connected to
a base 11. The underside of the mechanism has a column mount 15 on
its underside which may be mounted on the column of the wheeled
support of a standard office chair. As the tilt mechanism 10
rotates relative to the base 11, this causes the wheeled support of
the chair to tilt relative to a seat of the chair mounted on the
top surface of the base 11.
[0031] Counteracting the tendency of the tilt mechanism 10 to
rotate relative to the base 11 is the compression spring 13
compressed between the underside of the tilt mechanism 10 and a
knob 12 secured to the base 11 by the retaining bolt 14. The knob
12 is adjustably mounted on the retaining bolt 14 so that it may be
rotated to add or remove a preloading force to the compression
spring 13. This preloading force causes the tilt mechanism 10 to
rotate more or less stiffly relative to the base 11 when subjected
to an outside force. Through this mechanism, a user of the chair
can adjust the recline resistance of her chair to her personal
comfort.
[0032] FIG. 2 shows another conventional tilt mechanism for use
with a chair control device. Similarly to the device of FIG. 1, a
tilt mechanism 20 is provided which rotates relative to the base
21, and the tilt mechanism 20 is provided with a column mount 25 on
its underside. In contrast to the device of FIG. 1, in place of a
compression spring bearing on the outside of the tilt mechanism 20
a torsion spring 23 is provided within the tilt mechanism 20, and a
knob 22 bears directly on the tilt mechanism 20. The knob 22 is
drawn downwards by a retaining hook 24 which passes through an
opening in the tilt mechanism 20 to engage with a torsion spring 23
within. The opposition end of the torsion spring 23 bears on the
base 21, and is provided with a stop 28 for this purpose.
[0033] In the conventional mechanism shown in FIG. 2, the
compression spring has been replaced by the torsion spring 23 in
part to accommodate the addition of the clutch assembly 26. This
assembly connects the base 21 and the tilt mechanism 20 and allows
the rotation of one to be halted relative to the other at any
position throughout its range. While the clutch assembly provides a
useful functionality to the chair control device of FIG. 2, it
cannot be added to the chair control device shown in FIG. 1 as is
without significantly redesigning the tilt mechanism 11 requiring
at the very least that it be made larger overall, significantly so
in the area of the added clutch assembly. This larger tilt
mechanism 20 cannot easily accommodate a compression spring without
impeding its function. Furthermore, if one were to try to add a
compression spring to the mechanism shown in FIG. 2 by placing it
between the knob 22 and the tilt mechanism 20, the knob 22 would
extend an unacceptably far distance below the base 21 and interfere
with other functions of the chair itself. Thus in the known
mechanism of FIG. 2, in place of a compression spring a torsion
spring 23 is used. Although the redesigned tilt mechanism 20
provides tilt functionality to the chair control device and
accommodates the newly added clutch assembly 26, its complexity
makes it difficult to manufacture and thus relatively expensive.
Likewise the torsion spring 23 is also more expensive than more
common compression springs. As such the chair control device of
FIG. 2, while providing increased functionality over the chair
control device of FIG. 1, does so only at an increased cost in
materials.
[0034] FIG. 3 shows an exemplary embodiment of a tilt mechanism for
use the present chair control device. The device has a tilt
mechanism 30 which as in the previous figures rotates relative to
the base 31. However unlike the prior art figures, this embodiment
of a tilt mechanism features a clutch assembly 36 together with a
compression spring 33, as well as a relatively simple design for
the tilt mechanism 30 comprising a central plate 38, a column mount
35 and a pair of sidewalls 37 extending from the central plate to
the column mount. In one embodiment, the pair of sidewalls 37 are
substantially parallel to one another and substantially
perpendicular to the central plate 38. In another embodiment, the
pair of sidewalls reinforce and add rigidity to the central plate.
In yet another embodiment, an incline 37 may be provided on the
central plate 38, on which incline 37 the compression spring 33
bears.
[0035] Because the tilt mechanism 30 is provided with these
sidewalls 37 extending from the central plate 38 away from the base
31 towards the bottom of the device in contrast to the tilt
mechanisms of the prior art, the surface of the central plate 38 on
which a spring bears can be closer to the base 31 than would
otherwise be the case. As such, a compression spring can be used
rather than torsion spring of the prior art. To further accommodate
this substitution, the clutch assembly 36 and a clutch lever (not
shown) can be provided as a unit fixably mounted on the base 31
below which point it pivotably engages the tilt mechanism 30. A
knob 32 is also provided secured to the base 31 by the retaining
bolt 34. The knob 32 is adjustably mounted on the retaining bolt 34
so that it may be rotated to add or remove a preloading force to
the compression spring 33.
[0036] FIG. 4 shows perspective view of an exemplary embodiment of
a chair control device wherein the tilt mechanism is concealed
beneath a shroud. The device comprises a base 51 and a tilt
mechanism (not shown) which may be pivotably connected thereto at
the primary pivot point 42. A shroud 44 attached to the base 51 at
least partially covers the tilt mechanism to reduce the risk to a
user of a user's finger being caught between the tilt mechanism and
the base 51. A knob 52 is provided which may be adjusted to add or
remove a preloading force to the compression spring 59 mounted
beneath the knob 52 on the tilt assembly. In an alternative
embodiment, the spring 59 may be any elastic element. The base 51
is provided with tabs 67 through which the device may be attached
by bolts or another fastener to the underside of the seat portion
of a chair (not shown).
[0037] The tilt mechanism supports the column mount 55 which can be
mounted on the column of a standard wheeled support for an office
chair (not shown). This column may include a gas cylinder having
two-chambers separated by a normally closed valve. A user actuator
62 may be provided tiltably mounted in a housing above the valve
opening member, and which may be operated to depress the valve
opening member in order to open the cylinder valve to permit height
adjustment of the seat.
[0038] Further adjustment devices may be provided as part of the
present chair control device including a primary clutch lever 63
attached to the base 51 by a clutch housing 43. The primary clutch
lever 63 is provided to operate a clutch assembly at least
partially concealed within the shroud 44, which assembly comprises
at least one clutch plate and a clutch pin 41. The primary clutch
lever 63 may be operated to engage or disengage the clutch assembly
to prevent or permit tilt mechanism to move relative to the base
51. A secondary adjustment assembly 60 may be provided to support
element for a chair backrest, the motion of which secondary
adjustment assembly 60 may halted by the engagement of a secondary
clutch lever 61. A recline locking lever 65 may be provided mounted
on the base 51 having a recline locking stop 66 thereon which may
be slid into a blocking position to prevent the tilt assembly from
being adjusted to the fully upright position relative to the base
51.
[0039] FIG. 5 shows another perspective view of the chair control
device of FIG. 4 wherein the shroud has been removed so that the
tilt mechanism 50 is visible. As previously mentioned, the tilt
mechanism 50 may be pivotably connected to the base 51 at a primary
pivot point 42. Also visible in FIG. 5 is a spring loaded clutch
bracket 64 which the primary clutch lever 63 mounted on the base 51
may be operated to disengage, as well as a clutch assembly 56. FIG.
6 shows an overhead view of the chair control device of FIG. 5
having a clutch spring 68 for spring loading the clutch bracket 64.
The tilt mechanism 50 is shown here having reinforcing ridges 69
thereon to provide additional stiffness. FIG. 7 depicts an
embodiment of the present chair control device wherein an outline
of the base 71 is shown in relation to outlines of the tilt
mechanism in both the reclined position 70a as well as an upright
p006Fsition 70b.
[0040] FIG. 8 shows a side view of an exemplary embodiment of a
tilt mechanism 80 provided with a primary pivot point 82 for
engaging with a base of a chair control device, column mount
flanges 85 for engaging with a column mount, a user actuator 84 to
permit height adjustment of the seat and an actuator slot 83
therefore, an incline 86 to provided a bearing surface for a
compression spring or other elastic element, and a retaining bolt
passage 87 through which a retaining bolt may pass to secure a
control knob to the base of a chair control device.
[0041] FIG. 9 shows an overhead view of the tilt mechanism 80 of
FIG. 8 wherein clutch mounts 88 are visible. In one embodiment, the
clutch mounts 88 comprise raised tabs which pivotably engage the at
least one clutch plate of the clutch assembly of the chair control
device. The column mount flanges 85 are also shown having at least
one rivet hole 89 to which a plate column mount may be attached to
receive the column of a wheeled or other support of a chair.
Reinforcing flanges 92 extending downward from the second central
plate 90 to reinforce the second central plate 90 are also shown in
FIGS. 8, 9 and 10B.
[0042] FIG. 10A depicts detail 1 of FIG. 8 showing the user
actuator 84 to permit height adjustment of the seat and the
actuator slot 83 therefore. FIG. 10B shows an end view of the tilt
mechanism of FIG. 8 wherein the a tilt mechanism 80 comprises a
second central plate 90, a second pair of sidewalls 91, and column
mount flanges 85 which may be attached to a column mount, in which
case a passage is provided through the tilt mechanism 80 defined by
the second central plate 90, the column support and the first pair
of sidewalls 91. In an exemplary embodiment, the second pair of
sidewalls 91 extend substantially perpendicular from the central
plate 90, and are substantially parallel to one another.
[0043] FIG. 11 shows an overhead view of an exemplary embodiment of
a base 111 for use with a chair control device comprising tabs 117
through which the base 111 may be attached by bolts or other
fasteners to the underside of the seat portion of a chair (not
shown), a raised portion 115 and retaining bolt socket 116 for
securing an end of a retaining bolt, a protrusion 114, and a neck
113 which narrows to provide an attachment point for a secondary
adjustment assembly 60. In one embodiment, base 111 comprises a
base end plate 112 though which a recline locking stop 66 of a
recline locking lever 65 passes.
[0044] FIG. 12 shows a side view of the base 111 of FIG. 11 having
a passage 121 for a clutch bracket 64, a passage 122 for a clutch
pin 41, an actuator slot 118, a passage 123 for a secondary clutch
pin, secondary pivot point 124 for a secondary adjustment assembly
60, and a primary pivot point 125 for a tilt mechanism 50. FIG. 13
shows an end view of the base 111 of FIG. 11 wherein the base
comprises a central plate 131 and a pair of sidewalls 132. In an
exemplary embodiment, the pair of sidewalls 132 extend
substantially perpendicularly downward from the central plate 131
and are substantially parallel to one another.
[0045] FIG. 14A depicts the protrusion 114 highlighted in detail 1
of FIG. 11, FIG. 14B depicts the raised portion 115 highlighted in
section B-B of FIG. 11, and FIG. 14C depicts the raised portion 115
and retaining bolt socket 116 highlighted in section A-A of FIG.
11. FIG. 15A shows a top view of one embodiment of a tilt clutch
bracket 154 having a clutch pin passage 151, FIG. 15B shows a side
view of the tilt clutch bracket 154, and FIG. 15C depicts detail 2
of FIG. 12.
* * * * *