U.S. patent application number 14/246153 was filed with the patent office on 2015-10-08 for bow with take-up cables anchored to riser.
This patent application is currently assigned to POE LANG ENTERPRISE CO., LTD.. The applicant listed for this patent is Poe Lang Enterprise Co., Ltd.. Invention is credited to Eldwin Chang.
Application Number | 20150285581 14/246153 |
Document ID | / |
Family ID | 54209477 |
Filed Date | 2015-10-08 |
United States Patent
Application |
20150285581 |
Kind Code |
A1 |
Chang; Eldwin |
October 8, 2015 |
BOW WITH TAKE-UP CABLES ANCHORED TO RISER
Abstract
A bow includes a riser, a pair of limbs, two pulleys, and a bow
string set. Each pulley includes a primary wheel and a secondary
wheel adjacent to the primary wheel. The bow string set includes a
let-off cable, a first take-up cable and a second take-up cable.
The let-off cable has opposite ends respectively trained about the
primary wheels of the pulleys. The first take-up cable has one end
strung about the secondary wheel of one of the pulleys, and the
other end anchored to a right rear side of the riser, without
extending across a launching path of the bow. Similarly, the second
take-up cable has one end strung about the secondary wheel of the
other pulley, and the other end anchored to a left rear side of the
riser, without extending across the launching path of the bow.
Inventors: |
Chang; Eldwin; (Taichung
City, TW) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Poe Lang Enterprise Co., Ltd. |
Taichung City |
|
TW |
|
|
Assignee: |
POE LANG ENTERPRISE CO.,
LTD.
Taichung City
TW
|
Family ID: |
54209477 |
Appl. No.: |
14/246153 |
Filed: |
April 7, 2014 |
Current U.S.
Class: |
124/25 ;
124/25.6 |
Current CPC
Class: |
F41B 5/105 20130101;
F41B 5/123 20130101 |
International
Class: |
F41B 5/12 20060101
F41B005/12; F41B 5/10 20060101 F41B005/10 |
Claims
1. A bow comprising: a riser having two hook portions respectively
positioned on right and left rear sides of the riser; a pair of
limbs attached to opposite ends of the riser; two pulleys
respectively mounted on rear tips of the limbs, each pulley
including a primary wheel and a secondary wheel adjacent to the
primary wheel; and a bow string set including a let-off cable, a
first take-up cable and a second take-up cable; the let-off cable
having opposite ends respectively trained about the primary wheels
of the pulleys; the first take-up cable having one end strung about
the secondary wheel of one of the pulleys, and the other end
anchored to the hook portion on the right rear side of the riser,
without extending across a launching path of the bow; and the
second take-up cable having one end strung about the secondary
wheel of the other pulley, and the other end anchored to the hook
portion on the left rear side of the riser, without extending
across the launching path of the bow.
2. A bow as recited in claim 1, further comprising a stock
connected to a rear side of the riser, wherein the stock has in its
top a track for receiving a projectile and at its bottom a trigger
for launching the projectile.
3. (canceled)
4. A bow as recited in claim 1, wherein at least one of the pulleys
is eccentric.
Description
BACKGROUND OF THE INVENTION
[0001] 1. Field of the Invention
[0002] The present invention relates to a bow, such as a crossbow
or a compound bow, and more particularly to a bow having a bow
string set with two take-up cables each anchored to a rear side of
a riser of the bow.
[0003] 2. Description of the Related Art
[0004] One type of compound bow is illustrated in U.S. Pat. No.
3,486,495 (1969). In this bow, rotatable, variable leverage pulley
members are equipped on the tips of the bow limbs. A bowstring is
wound over the pulley members to provide mechanical advantage, and
less force is required to hold the bowstring in a fully drawn
position than to hold the bowstring at an intermediate draw
position. Similar to the compound bow, a crossbow also employs the
pulley members to provide similar functions.
[0005] FIG. 5 illustrates a conventional crossbow 900, comprising a
stock 91, a riser 92 positioned at a front of the stock 91, two
limbs 93, 94 with front ends attached to opposite ends of the riser
92, two eccentric pulleys 95, 96 respectively mounted to rear tips
of the limbs 93, 94 and a bow spring set 97. Each of the eccentric
pulleys 95 (or 96) is consisted of a primary wheel 951 (or 961) and
a relatively smaller secondary wheel (not shown). The bow spring
set 97 includes a let-off cable 970 and two substantially Y-shaped
take-up cables 971, 972.
[0006] Specifically, the let-off cable 970 has opposite end
portions respectively trained about the two primary wheels 951, 961
of the eccentric pulleys 95, 96. Each of the take-up cables 971 or
972 has one end trained about one of the secondary wheels, and the
other end anchored to the other secondary wheel. In other words,
the two take-up cables 971, 972 both extend across a launching path
R1 of the crossbow 900, which unfortunately may interrupt the
launching of a projectile (not shown) which is placed on a track
910 of a stock 91. In order to solve this problem, a slot 910 is
defined in a front of the stock 91 so as to permit the take-up
cables 971, 972 to pass therethrough and keep away from the
launching path R1. However, this configuration has disadvantages in
that the slot 910 would have to be specially formed, thus raising
the cost of the bow and lessening the strength of the front of the
stock 91. This would further cause a lower collimation degree of
the track 910 of the stock 91 by which the launching of the
projectile would be adversely affected.
SUMMARY OF THE INVENTION
[0007] Accordingly, it is an object of the present invention to
provide a bow to solve the aforementioned problems. The bow
includes a riser, a pair of limbs attached to opposite ends of the
riser, two pulleys respectively mounted on rear tips of the limbs,
and a bow string set. Each pulley includes a primary wheel and a
secondary wheel adjacent to the primary wheel. The bow string set
includes a let-off cable, a first take-up cable and a second
take-up cable. The let-off cable has opposite ends respectively
trained about the primary wheels of the pulleys. The first take-up
cable has one end strung about the secondary wheel of one pulley,
and the other end anchored to a right rear side of the riser,
without extending across a launching path of the bow. Similarly,
the second take-up cable has one end strung about the secondary
wheel of the other pulley, and the other end anchored to a left
rear side of the riser, without extending across the launching path
of the bow.
[0008] Preferred embodiment of the invention may have the following
additional characteristics, either alone or in combination:
[0009] A stock is employed to be connected to a rear side of the
riser. The stock defines in its top a track for receiving a
projectile and has at its bottom a trigger for launching the
projectile. The riser may have two hook portions respectively
positioned on the right and left rear sides of the riser to engage
with the first and second take-up cables.
[0010] 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
[0011] FIG. 1 is a top side perspective view of a bow in accordance
with the preferred embodiment of the present invention;
[0012] FIG. 2 is a bottom side perspective view of the bow shown in
FIG. 1;
[0013] FIG. 3 is a partial enlarged view of the bow shown in FIG.
1;
[0014] FIG. 4 is a partial enlarged view of the bow shown in FIG.
2; and
[0015] FIG. 5 is a prior art.
DETAILED DESCRIPTION OF PREFERRED EMBODIMENT
[0016] In the accompanying drawings, a crossbow 100 is illustrated
which includes a stock 1, a riser 2 disposed in a front of the
stock 1, a pair of limbs 3, 4 connected at their front ends in
fixed relation to the riser 2, two pulleys 5, 6 respectively
mounted on rear tips of the limbs 3, 4, a bow string set 7
connecting the two pulleys 5, 6, and a stirrup 8. Each of the
pulleys 5 (or 6) includes a primary wheel 51 (or 61) and a
secondary wheel 52 (or 62) adjacent to the primary wheel 51 (or
61), as best seen in FIGS. 3 and 4.
[0017] Referring back to FIG. 1, the stock 1 has in its top a track
10 for receiving a projectile (not shown) and at its bottom a
trigger 12 for discharging the projectile. Once the trigger 12 is
squeezed, the projectile would go off along the track 10, viz
launching path (R2), as known in the art.
[0018] The bow string set 7 includes a let-off cable 70, a first
take-up cable 71 and a second take-up cable 72. The let-off cable
70 has one end trained about the primary wheel 51 of the right
pulley 5, and the other end trained about the primary wheel 61 of
the left pulley 6. The first take-up cable 71 has one end strung
about the secondary wheel 52 of the right pulley 5, and the other
end extending in a direction toward the riser 2 and anchored to a
hook portion 21 on the right rear side of the riser 2. Similarly,
the second take-up cable 72 has one end strung about the secondary
wheel 62 (FIG. 4) of the left pulley 6, and the other end extending
in a direction toward the riser 2 and anchored to a hook portion 22
on the left rear side of the riser 2. That is to say, neither first
take-up cable 71 nor the second take-up cable 72 extends across the
launching path R2 of the crossbow 100. This ensures that the
projectile can be discharged without any interrupt of the first
take-up cable 71 or the second take-up cable 72, and therefore no
slots will be needed to be defined in the front of the stock 1 as
taught in the prior art. Thus, the crossbow 100 can be produced at
relatively lower cost with higher rigidity and higher collimation
degree of the track 10 of the stock 1 for launching the
projectile.
[0019] It should be noted that, although the pulleys 5, 6 shown in
the preferred embodiment are both eccentric pulleys, any type of
pulleys may be used as dictated by the convention. For example, one
may be idle while the other be an eccentric pulley. Moreover,
although the bow 100 shown in the preferred embodiment is a
crossbow, the present invention may also be applied to a compound
bow where no stock is employed, as long as the two take-up cables
of the compound bow do not extend across the launching path R2 of
the bow.
[0020] It is to be understood that the disclosed embodiments are
illustrative in nature and the invention is not to be limited to
any one or more embodiments except as set forth in the following
claims.
* * * * *