U.S. patent application number 16/131011 was filed with the patent office on 2020-03-19 for limb assembly for sport bow.
The applicant listed for this patent is Chi-Chang Liu. Invention is credited to Chi-Chang Liu.
Application Number | 20200088492 16/131011 |
Document ID | / |
Family ID | 69773904 |
Filed Date | 2020-03-19 |
United States Patent
Application |
20200088492 |
Kind Code |
A1 |
Liu; Chi-Chang |
March 19, 2020 |
LIMB ASSEMBLY FOR SPORT BOW
Abstract
A limb assembly for a sport bow includes two limb pockets
connected to two rises of the bow and each limb pockets includes
two slots with a separation plate connected between the two slots.
Each slot includes an open space. Two limb units each have the
first end thereof inserted into the slots from the open space of
each of the two limb pockets. A string IS connected between two
respective second ends of the two limb units. Two resilient members
are respectively located between the body and each of the two limb
units. Each resilient member has a buffering portion protruding
therefrom which is received in a recess of the rise corresponding
thereto so that each limb unit resiliently compresses the rise by
the resilient members. The resilient members are replaceable to
adjust the compress force between the limb units and the rises.
Inventors: |
Liu; Chi-Chang; (TAICHUNG
CITY, TW) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Liu; Chi-Chang |
TAICHUNG CITY |
|
TW |
|
|
Family ID: |
69773904 |
Appl. No.: |
16/131011 |
Filed: |
September 13, 2018 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
F41B 5/1403 20130101;
F41B 5/10 20130101 |
International
Class: |
F41B 5/14 20060101
F41B005/14; F41B 5/10 20060101 F41B005/10 |
Claims
1. A limb assembly for a sport bow, comprising: a body having two
rises on two ends thereof, each of the two rises having a recess;
two limb pockets connected to the two rises and each having two
slots defined therein, a separation plate connected between the two
slots of each of the two limb pockets, each of the slots including
an open space, a bolt extending through the separation plate and
connecting each of the two limb pockets to the body; two limb units
each having a first end thereof inserted into the slots from the
open space of each of the two limb pockets, a string connected
between two respective second ends of the two limb units, and two
resilient members respectively located between the body and each of
the two limb units, each resilient member having a buffering
portion protruding therefrom which is received in the recess of the
rise corresponding thereto, each of the limb units resiliently
compressing the rise corresponding thereto by the resilient
members.
2. The limb assembly as claimed in claim 1, wherein each of the
rises includes a connection portion and two pivotal members, the
two pivotal members are located on two sides of the connection
portion, the connection portion includes two first recessed
portions respectively defined in the two sides thereof, each
pivotal member has a second recessed portion that faces the first
recessed portion, each pivotal member having the recess of the rise
and the recess located opposite to the second recessed portion, the
buffering portion of each resilient member received in the recess
of the pivotal member corresponding thereto, an axle extends
through the two pivotal members and the connection portion, two
bolts respectively threadedly connected to two ends of the axle,
each bolt contacts against an outside face of the pivotal member
corresponding thereto to secure the two pivotal members to the
connection portion.
3. The limb assembly as claimed in claim 2, wherein the open space
of each slot includes a long opening and a short opening, the long
opening faces the rise, the short opening is located at an end of
the slot.
4. The limb assembly as claimed in claim 3, wherein each of the
limb units includes two sub-limbs which are respectively inserted
into the slots via the two short openings.
5. The limb assembly as claimed in claim 4, wherein the buffering
portion of each resilient member has a hole defined therethrough so
as to provide flexibility to the buffering portion.
6. The limb assembly as claimed in claim 5, wherein an elastic
coefficient of each of the resilient members is larger than or
equal to 100 GPa.
7. The limb assembly as claimed in claim 6, wherein each of the
resilient members is made of rubber, low density polyethylene,
polypropylene, polyethylene terephthalate, polystyrene, nylon, oak
or carbon fiber reinforcement plastic.
Description
BACKGROUND OF THE INVENTION
1. Fields of the Invention
[0001] The present invention relates to a limb assembly, and more
particularly, to a limb assembly of a sport bow and the limb
assembly allows the users to easily change suitable limbs.
2. Descriptions of Related Art
[0002] The conventional sport bow generally includes a body having
a grip located at the central portion thereof, and with two rises
extend from two ends of the body. Each raise is connected with a
limb which is connected with a cam, and a string is connected
between the two cams. A user draws the string to store energy which
is used to shoot the arrow when releasing the string. However, the
draw weight is different of different sport bows, and some users
may not able to draw the string to a full draw due to the draw
weight is not suitable for the users. Therefore, the users should
use a specific sport bow that is suitable for the user to operate.
Nevertheless, not every user can own his or her sport bow, in order
to obtain a proper sport bow, the limbs need to be replaced.
[0003] The replacement of the limbs requires a lot of time and
needs specific tools for a skilled person, and this job cannot be
easily done by a general user. Therefore, a replaceable limb
assembly is developed to improve the problem mentioned above.
[0004] The present invention is intended to provide a limb assembly
that is easily installed to the sport bow to meet different users'
needs.
SUMMARY OF THE INVENTION
[0005] The present invention relates to a limb assembly for a sport
bow, and comprises a body having two raise on two ends thereof and
each rise has a recess. Two limb pockets are connected to the two
rises and each have two slots with a separation plate connected
therebetween. Each of the slots includes an open space. Two limb
units each have the first end thereof inserted into the slots from
the open space of each of the two limb pockets. A string is
connected between two respective second ends of the two limb units.
Two resilient members are respectively located between the body and
each of the two limb units. Each resilient member has a buffering
portion protruding therefrom which is received in the recess of the
rise corresponding thereto. Each of the limb units resiliently
compress the rise corresponding thereto by the resilient
members.
[0006] Preferably, each of the rises includes a connection portion
and two pivotal members. The two pivotal members are located on two
sides of the connection portion. The connection portion includes
two first recessed portions respectively defined in the two sides
thereof. Each pivotal member has a second recessed portion that
faces the first recessed portion. An axle extends through the two
pivotal members and the connection portion. Two bolts are
respectively threadedly connected to two ends of the axle. Each
bolt contacts against the outside face of the pivotal member
corresponding thereto to secure the two pivotal members to the
connection portion.
[0007] Preferably, the open space of each slot includes a long
opening and a short opening. The long opening faces the rise, and
the short opening is located at one end of the slot.
[0008] Preferably, each of the limb units includes two sub-limbs
which are respectively inserted into the slots via the two short
openings.
[0009] Preferably, the buffering portion of each resilient member
has a hole defined therethrough so as to provide flexibility to the
buffering portion.
[0010] Preferably, the elastic coefficient of each of the resilient
members 7 is larger than or equal to 100 GPa.
[0011] Preferably, each of the resilient members 7 is made of
rubber, low density polyethylene, polypropylene, polyethylene
terephthalate, polystyrene, nylon, oak or carbon fiber
reinforcement plastic.
[0012] The advantages of the present invention are that the users
may change the resilient members to adjust the force that the limb
units compress the rises, without changing the limbs, to obtain a
suitable drawing force.
[0013] The present invention will become more obvious from the
following description when taken in connection with the
accompanying drawings which show, for purposes of illustration
only, a preferred embodiment in accordance with the present
invention.
BRIEF DESCRIPTION OF THE DRAWINGS
[0014] FIG. 1 is a perspective view to show the sport bow with the
limb assemblies of the present invention;
[0015] FIG. 2 is an enlarged view to show the assembly of the rise,
the limb pocket and the resilient members of the limb assemblies of
the present invention;
[0016] FIG. 3 is an exploded view of the disclosure in FIG. 3;
[0017] FIG. 4 is an cross sectional view, taken along line IV-IV of
FIG. 2;
[0018] FIG. 5 shows the limb compresses the resilient members when
drawing the string, and
[0019] FIG. 6 shows the operation of the resilient member made of
different material.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
[0020] Referring to FIGS. 1 to 6, the limb assembly for a sport bow
of the present invention comprises a body 1 having two raise 10
connected two ends thereof. Two limb pockets 2 are respectively
connected to the two rises 1 and each limb unit 4 has two slots 21
defined therein. A separation plate 23 is connected between the two
slots 21 of each of the two limb pockets 2. Each of the slots 21
includes an open space 22, wherein the open space 22 includes a
long opening 221 and a short opening 222. The long opening 221
faces the rise 10, and the short opening 222 is located at an end
of the slot 21 and communicates with the long opening 221. A bolt 3
extends through the separation plate 23 and connects each of the
two limb pockets 2 to the body 1. Each of the rises 10 includes a
connection portion 12 and two pivotal members 13. The two pivotal
members 13 are located on two sides of the connection portion 12.
The connection portion 12 includes two first recessed portions 121
respectively defined in the two sides thereof. Each pivotal member
13 has a second recessed portion 131 that faces the first recessed
portion 121, and a recess 11 that is located opposite to the second
recessed portion 131 as shown in FIG. 3. An axle 5 extends through
the two pivotal members 13 and the connection portion 12, and two
bolts 8 are respectively threadedly connected to two ends of the
axle 5. Each bolt 8 contacts against the outside face of the
pivotal member 13 corresponding thereto to secure the two pivotal
members 13 to the connection portion 12.
[0021] Two limb units 4 each have the first end thereof inserted
into the slots 21 from the open space 22 of each of the two limb
pockets 2. A string 6 is connected between two cams that are
respectively connected to the second ends of the two limb units 4.
Specifically, each of the limb units 4 includes two sub-limbs 41
which are respectively inserted into the slots 21 via the two short
openings 222.
[0022] Two resilient members 7 are respectively located between the
body 1 and each of the two limb units 4. Each resilient member 7
has a buffering portion 71 protruding therefrom. The buffering
portion 71 of each resilient member 7 is received in the recess 11
of the pivotal member 13 corresponding thereto. Each of the limb
units 4 resiliently compresses the rise 10 corresponding thereto by
the resilient members 7. The buffering portion 71 of each resilient
member 7 has a hole 72 defined therethrough so as to provide
flexibility to the buffering portion 71. The elastic coefficient of
each of the resilient members 7 is larger than or equal to 100 GPa.
Each of the resilient members 7 is made of rubber, low density
polyethylene, polypropylene, polyethylene terephthalate,
polystyrene, nylon, oak or carbon fiber reinforcement plastic.
[0023] As shown in FIGS. 4 to 6, when the user draws the string 6,
the limb units 4 compress the resilient members 7. If a user cannot
draw the string 6 to a full draw, this means the limb units 4 are
too stiff for the user, the user then can change the resilient
members 7 that have higher elastic coefficient. The resilient
members 7 also prevent the limb units 4 to hit the limb pockets 2
when the limb units 4 bounce back.
[0024] Furthermore, the hole 72 in each buffering portion 71
provides proper flexibility to the buffering portion 71 such that
the noise caused by the string 6 and the deformation of the limb
units 4 can be reduced.
[0025] The replacement of the resilient members 7 are easy, and the
whole limb units 4 and the limb pockets 2 do not need to be
dis-assembled. By choosing correct resilient members 7, the sport
bow can be used by different users.
[0026] While we have shown and described the embodiment in
accordance with the present invention, it should be clear to those
skilled in the art that further embodiments may be made without
departing from the scope of the present invention.
* * * * *