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US Patent 8136514 Device for propelling a projectile

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Patent abstractTimelineTable: Further ResourcesReferences
Is a
Patent
Patent

Patent attributes

Patent Jurisdiction
United States Patent and Trademark Office
United States Patent and Trademark Office
Patent Number
8136514
Date of Patent
March 20, 2012
Patent Application Number
12183018
Date Filed
July 30, 2008
Patent Citations Received
‌
US Patent 11874085 Trigger-traverse crossbow
3
‌
US Patent 11982508 Crossbow and crossbow string guide power journals
4
‌
US Patent 11982333 Actuator and a bow
5
Patent Primary Examiner
‌
Gene Kim
Patent abstract

An archery or similar projectile launching device having a spring assembly to energize the device and a release mechanism to transmit energy stored within a torsion or alternative spring to the bowstring, so as to accelerate an arrow nocked to the bowstring once the trigger is released. In one embodiment, conjoined cranks wind a torsion spring within a spring motor affixed along the riser of the bow while the bowstring and arrow are concurrently brought into the discharge position. A mechanical advantage may be achieved with the cranking mechanism to reduce the effort exerted by the archer and thereby increase accuracy, velocity and ease of use.

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