BOW WITH TAKE-UP CABLES ANCHORED TO RISER
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.
Latest POE LANG ENTERPRISE CO., LTD. Patents:
1. Field of the Invention
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.
2. Description of the Related Art
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.
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 INVENTIONAccordingly, 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.
Preferred embodiment of the invention may have the following additional characteristics, either alone or in combination:
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.
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.
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
Referring back to
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 (
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.
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.
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.
Type: Application
Filed: Apr 7, 2014
Publication Date: Oct 8, 2015
Applicant: POE LANG ENTERPRISE CO., LTD. (Taichung City)
Inventor: Eldwin Chang (Taichung City)
Application Number: 14/246,153