Mechanical guns and projectors – Spring – Bow
Patent
1977-05-02
1978-09-12
Browne, William R.
Mechanical guns and projectors
Spring
Bow
124 90, F41B 500
Patent
active
041129091
ABSTRACT:
A compound bow having a center handle portion, upper and lower limbs having inner ends connected to the handle portion, and upper and lower draw pulleys mounted on the free outer ends of the upper and lower limbs. Each of the draw pulleys has a peripheral portion, a central portion, and first and second spaced grooves in the peripheral portion. A passage in each draw pulley leads through its central portion and connects the first and second grooves.
Each pulley has an inner surface portion and an outer surface portion on the peripheral portion with the inner surface portion facing the bow and the outer surface portion being directed away from the bow when the bow is in its rest position. A pivotal mounting is provided for each pulley with the pulleys being eccentrically positioned on the mountings for rotational movement during draw of the bow with the bowstring supported by the pulleys. Rotational movement of the pulleys increases the effective length of each of the bow limbs. Due to the structure and positioning of the pulleys and the manner in which the pulleys are supported by draw cables, the force required to draw the bow increases rapidly when the bow reaches its fully drawn position so that it is virtually impossible to overdraw the bow.
REFERENCES:
patent: 3854467 (1974-12-01), Hofmeister
patent: 3990425 (1976-11-01), Ketchum
Browne William R.
Jennings Compound Bow, Inc.
Roston Ellsworth R.
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