U.S. patent application number 14/884781 was filed with the patent office on 2016-02-04 for compound bow structure.
The applicant listed for this patent is CHI-CHANG LIU. Invention is credited to CHI-CHANG LIU.
Application Number | 20160033227 14/884781 |
Document ID | / |
Family ID | 55179680 |
Filed Date | 2016-02-04 |
United States Patent
Application |
20160033227 |
Kind Code |
A1 |
LIU; CHI-CHANG |
February 4, 2016 |
COMPOUND BOW STRUCTURE
Abstract
A compound bow structure includes a riser having a grip and a
recess is defined in the inside of the grip. A first cam and a
second cam are respectively connected to the two limbs and a string
is connected between the first and second cams. Two cables each
have a first end connected to the first/second cam corresponding
thereto. The two cables each have a second end which has two split
sub-cables. The sub-cables of the two cables are respectively
connected to two sides of the first/second cam corresponding
thereto. A protector is connected to the inside of the grip and
located to cover the recess of the grip. The string bounces toward
the protector along a plane that passes through the rear side of
the protector. A gap is formed between the grip and the protector
to accommodate the user's hand.
Inventors: |
LIU; CHI-CHANG; (TAICHUNG
CITY, TW) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
LIU; CHI-CHANG |
TAICHUNG CITY |
|
TW |
|
|
Family ID: |
55179680 |
Appl. No.: |
14/884781 |
Filed: |
October 16, 2015 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
|
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14249324 |
Apr 9, 2014 |
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14884781 |
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Current U.S.
Class: |
124/25.6 |
Current CPC
Class: |
F41B 5/1403 20130101;
F41B 5/10 20130101 |
International
Class: |
F41B 5/10 20060101
F41B005/10 |
Claims
1. A compound bow structure comprising: a riser having a grip and
two extensions extending from two ends of the grip, a recess
defined in an inside of the grip, two limbs respectively connected
to two distal ends of the two extensions; a protector connected to
the inside of the grip and located between the two limbs, the
protector having a front side and a rear side, the front side of
the protector facing the recess and covering the recess of the
grip, and a control unit having a first cam and a second cam
respectively connected to two respective distal ends of the two
limbs, a string connected between the first and second cams, two
cables each having a first end connected to the first/second cam
corresponding thereto, the two cables each having a second end
which has two split sub-cables, the sub-cables of the two cables
respectively connected to two sides of the first/second cam
corresponding thereto, the rear side of the protector facing the
string, a distance "L" between a lowest point of the recess and the
string being smaller than 1/5 of a length of the string, the string
being pulled away from the protector, and bouncing toward the
protector along a plane that passes through the rear side of the
protector.
2. The compound bow structure as claimed in claim 1, wherein the
protector is an elongate plate which has two ends, the two ends of
the protector are connected to two ends of the recess, a gap is
formed between the grip and the protector so as to be adapted
accommodate a user's hand.
3. The compound bow structure as claimed in claim 2, wherein each
of the two limbs has a notch to form a first arm and a second arm,
the first and second cams are respectively located in the two
notches of the two limbs, each of the first and second cams has an
axle extending therethrough, the axle of each of the first and
second cams is connected between the first and second arms
corresponding thereto.
4. The compound bow structure as claimed in claim 3, wherein the
sub-cables of the cables are respectively connected to two ends of
the axle of the first/second cam corresponding thereto to adjust a
tension of the string and to adjust a distance "L" between the
string and the riser.
5. The compound bow structure as claimed in claim 1, wherein a
coefficient of elasticity of each of the two limbs is larger than
that of the riser.
6. The compound bow structure as claimed in claim 1, wherein the
distance "L" between the lowest point of the recess and the string
is equal to 1/6 of the length of the string.
7. The compound bow structure as claimed in claim 1, wherein the
rear side of the protector is intersected with the plane that the
string moves along at an angle.
8. The compound bow structure as claimed in claim 1, wherein the
rear side of the protector is tilt relative to the plane to have a
larger entrance of the gap.
Description
BACKGROUND OF THE INVENTION
[0001] 1. Field of the Invention
[0002] This is a Continuation-In-Part application of applicant's
former application 14/249,324, filed on Apr. 9, 2014.
[0003] 2. Description of Related Art
[0004] A conventional compound bow generally includes a bow and two
limbs extending from two ends of the riser, and each limb has a cam
unit connected thereto. A string is connected between the two cam
units on the limbs of the bow. The string is pulled away from the
riser to store energy. An arrow is attached with the string by its
nock so that when the string is released, the arrow is delivered to
the target by the energy.
[0005] However, the user's hand holding the riser is located on the
plane that the string bounces back so that it is possible that the
user's hand is hit by the string. The string that bounces back
releases a significant energy which can easily injure the user's
hand.
[0006] U.S. Pub. No. 2007/0256675 A1 discloses a compound bow with
a bridge removably connected to the riser so that a cable guide
roller is connected to the bridge. However, as described in
paragraphs 0032 and 0033 of Smith, the bridge is not used to
protect the user's hand from being hit by the string when in use.
The cable guide roller is mounted to the bridge which is removably
connected to the riser for a benefit of storage purposes.
[0007] The present invention provides a compound bow structure with
a protector so as to mitigate and/or obviate the disadvantages of
the conventional bows.
SUMMARY OF THE INVENTION
[0008] The main objective of the present invention is to provide a
compound bow structure which has a protector located between the
grip and the string so as to protect the user's hand from being hit
by the string after the string is released.
[0009] The present invention provides a compound bow structure and
comprises a riser having a grip, and two extensions extend from two
ends of the grip. A recess is defined in the inside of the grip.
Two limbs are respectively connected to two distal ends of the two
extensions. A protector is connected to the inside of the grip and
located between the two limbs. The protector has a front side and a
rear side, wherein the front side of the protector faces the recess
and covers the recess of the grip. A control unit has a first cam
and a second cam respectively connected to two respective distal
ends of the two limbs. A string is connected between the first and
second cams. Two cables each have a first end connected to the
first/second cam corresponding thereto. The two cables each have a
second end which has two split sub-cables. The sub-cables of the
two cables are respectively connected to two sides of the
first/second cam corresponding thereto. The rear side of the
protector faces the string. A distance "L" between a lowest point
of the recess and the string is smaller than 1/5 of a length of the
string. When the string is pulled away from the protector and
released, the string bounces toward the protector along a plane
that passes through the rear side of the protector.
[0010] Preferably, the protector is an elongate plate which has two
ends, and the two ends of the protector are connected to two ends
of the recess. A gap is formed between the grip and the protector
so as to accommodate the user's hand.
[0011] Preferably, each of the two limbs has a notch to form a
first arm and a second arm. The first and second cams are
respectively located in the two notches of the two limbs. The axle
of each of the first and second cams is connected between the first
and second arms corresponding thereto.
[0012] Preferably, the sub-cables of the cables are respectively
connected to two ends of the axle of the first/second cam
corresponding thereto to adjust the tension of the string and to
adjust the distance between the string and the riser.
[0013] Preferably, the coefficient of elasticity of each of the two
limbs is larger than that of the riser.
[0014] Preferably, the distance between the lowest point of the
recess and the string is equal to 1/6 of the length of the
string.
[0015] Further benefits and advantages of the present invention
will become apparent after a careful reading of the detailed
description with appropriate reference to the accompanying
drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
[0016] FIG. 1 is a perspective view of the compound bow structure
of the present invention;
[0017] FIG. 2 is an exploded view to show the limbs with the string
and the riser of the compound bow structure of the present
invention;
[0018] FIG. 3 is an exploded view to show the protector and the
riser of the compound bow structure of the present invention;
[0019] FIG. 4 is side view to show the compound bow structure of
the present invention, wherein the string is not yet pulled;
[0020] FIG. 5 is side view to show the compound bow structure of
the present invention, wherein the string is pulled;
[0021] FIG. 6 is side view to show the compound bow structure of
the present invention, wherein the string is released;
[0022] FIG. 7 shows the relative position relationship between the
protector and the string, wherein the string moves along the plane
that passes through the protector when the string bounces back,
and
[0023] FIG. 8 shows that the rear side of the protector is tilt
relative to the plane and the gap has a larger entrance for
convenience of insertion of the user's hand into the gap.
DETAILED DESCRIPTION OF THE INVENTION
[0024] Referring to the drawings and initially to FIGS. 1 to 3, the
compound bow structure in accordance with the present invention
comprises a riser 1 having a grip 11, and two extensions 12 extend
from two ends of the grip 11. The riser 1 has an inside 13 and an
outside 14. A recess 131 is defined in the inside of the grip 11.
Two limbs 2 respectively connected to the two distal ends of the
two extensions 12. Each of the two limbs 2 has a notch 21 to form a
first arm 22 and a second arm 23. A protector 3 is connected to the
inside of the grip 11 and located between the two limbs 2. The
protector 3 is an elongate plate with two ends and a certain width,
and has a front side 31 and a rear side 32. The two ends of the
protector 3 are connected to two ends of the recess 131 to cover
the recess 131. A gap 5 is formed between the grip 11 and the
protector 3 so as to accommodate the user's hand. The front side 31
of the protector 13 faces the recess 13 and covers the recess 131
of the grip 11.
[0025] A control unit 4 comprises a first cam 41 and a second cam
42 respectively connected to two respective distal ends of the two
limbs 2. In detail, the first and second cams 41, 42 are
respectively located in the two notches 21 of the two limbs 2. Each
of the first and second cams 41, 42 has an axle 6 extending
therethrough. The axle 6 of each of the first and second cams 41,
42 is connected between the first and second arms 41, 42
corresponding thereto.
[0026] A string 43 is connected between the first and second cams
41, 42. Two cables 44 each have a first end connected to the
first/second cam 41/42. The two cables 44 each have a second end
which has two split sub-cables 441. The two sets of the sub-cables
441 of the two cables 44 are respectively connected to the two ends
of the axle 6 of the first/second cam 41/42 corresponding thereto
to adjust the tension of the string 43 and to adjust the distance
between the string 43 and the riser 1. The rear side 132 of the
protector 13 faces the string 43. The string 43 is pulled away from
the protector, and bounces toward the protector 3 along a plane
that passes through the rear side 32 of the protector 3.
[0027] Further referring to FIG. 4, the distance "L" between the
lowest point of the recess 131 and the string 43 is smaller than
1/5 of the length "D" of the string 43. Preferably, the coefficient
of elasticity of each of the two limbs 2 is larger than that of the
riser 1.
[0028] When in use, further referring to FIG. 5, the user holds the
grip 11 of the riser 1 and the protector 3 covers the hand holding
the grip 11.
[0029] The other hand of the user pulls the string 43 away from the
riser 1. The first and second cams 41, 42 are then rotated and the
two limbs 2 are slightly deformed. An arrow (not shown) is attached
to the string 43 by its nock. The stroke that the string 43 is
pulled from its initial position to the maximum position decides
the distance that the arrow can reach. The longer the stroke is
pulled, the longer distance that the arrow can reach. When the
string 43 is released, as shown in FIGS. 6 and 7, the string 43
bounces back and toward the protector 3 along a plane that passes
through the rear side 32 of the protector 3. By the protector 3,
the user's hand is protected from being hit by the string 43. The
rear side 32 of the protector 3 can be intersected with the plane
that the string 43 moves along at a desired angle as long as the
user's hand is protected from being hit by the string 43. In other
words, the rear side 32 of the protector 3 can be tilt relative to
the plane to allow the gap 131 to have a larger entrance for
convenience of insertion of the user's hand into the gap 131 as
shown in FIG. 8. By adjusting the angle of the protector 3 relative
to the plane, a left-handed user and a right-handed user can easily
insert his/her hand into the gap 131.
[0030] The protector 3 is durable and light in weight. Preferably,
the protector 3 is made by plastic or hard rubber. The protector 3
can be connected to the grip 11 by using screws, rivets or by way
of snapping. The user's hand in the gap 5 is large enough to allow
the user's hand to easily inserted and remove. Preferably, the
distance "L" between the lowest point of the recess 131 and the
string 43 is equal to 1/6 of the length "D" of the string 43.
[0031] Furthermore, the notch 21 defined in each of the two limbs 2
reduces the weight of the limb 2. The first and second cams 41, 42
are located within the two respective notches 21 to allow the
shorter limbs 41, 42 to be used.
[0032] The sub-cables 441 of each of the cables 44 are respectively
connected to the two ends of the axle 6 of the first/second cam
41/42 corresponding thereto to adjust the tension of the string 43
and to adjust the distance between the string 43 and the riser
1.
[0033] The coefficient of elasticity of each of the two limbs 2 is
larger than that of the riser 1 so as to allow the limbs 2 to be
further deformed relative to the riser 1 to obtain longer
stroke.
[0034] The riser 1 and the limbs 2 can be integral to each other,
or the riser 1 and the limbs 2 can be assembled to each other. The
weight of the limbs 2 is controlled not to increase the whole
weight of the compound bow structure of the present invention. The
proper length of the limbs 2 can stabilize the compound bow
structure without being affected by the return of the string
43.
[0035] Although the invention has been explained in relation to its
preferred embodiment, it is to be understood that many other
possible modifications and variations can be made without departing
from the spirit and scope of the invention as hereinafter
claimed.
* * * * *