Back to results
US 5,960,778 AGranted
Compound archery bow
AssigneeBrowning
InventorMarlow W. Larson
Life of this patent
Estimating the term…
Abstract
A compound bow carries eccentrics, each of which has a non-circular string groove with a geometric center removed from the axis of the eccentric and a take-up groove which is out of registration with the string groove about substantially the entire peripheries of the grooves. The two grooves are carried by respective sheaves rotatably joined through a hub which is itself rotatably connected to one of the sheaves.
Claims12
A dual-feed single cam compound bow comprising:
- a handle with first and second limbs extending opposite each other from said handle to present mutually opposed respective first and second limb tips;
- a drop-off cam journaled at said first limb tip, said cam pivotally mounted on an axis;
- an elongated cable having an intermediate portion trained around said pulley to form first and second stretches between said pulley and said cam, said first stretch forming a bowstring with feed-out portions at its opposite ends and said second stretch forming a take-up portion at its pulley end and a feed-out portion at its cam end, a portion of the first stretch trained in a string groove of the cam, and a portion of the second stretch trained in a feed-out groove of the cam;
- ends of said elongated cable being positively anchored to the cam to produce a desired drop-off rotation of the cam when the bowstring is drawn;
- and
- an anchor stretch extending between said first and second limbs with one end fixed to said second limb tip and the opposite end fixed to said cam and trained in a take-up track of said cam to produce controlled flexing of said limbs during the drawing of said bowstring, said take-up track comprising:
- a first take-up groove with a periphery of a different shape than and non-concentric with a periphery of said string groove:
- and
- a second take-up groove in working relation to said first take-up groove. said second take-up groove having a periphery which is of a different shape than and non-concentric with the periphery of said string groove.
6 more elements
A dual-feed single-cam compound bow comprising:
- a handle with first and second limbs extending opposite each other from the handle to present mutually opposed respective first and second limb tips;
- a drop-off cam journaled at said first limb tip, said cam being pivotally mounted on an axis;
- a pulley journaled at said second limb tip;
- a string groove in said cam with a periphery having a geometric center remote from said axis, said string groove being parallel a plane approximately normal said axis;
- a first take-up groove in said cam having a periphery which is of a different shape than and non-concentric with the periphery of said string groove;
- a second take-up groove in said cam in working relation to said first take-up groove to form a working track in said cam;
- a feed-out groove in said cam having a periphery which is of a different shape than the periphery of said string groove;
- an anchor stretch extending between said first and second limbs with one end fixed to said second limb tip and another end of said anchor stretch fixed to said cam, a portion of said anchor stretch trained in the working track of said cam;
- a first stretch forming a bowstring between the cam and the pulley, a portion of said first stretch positioned in said string groove of the cam;
- and
- a second stretch between the cam and the pulley, a portion of said second stretch positioned in said feed-out groove of the cam.
8 more elements
Dependencies are inferred from the claim text.