Draw extending archery system

摘要

A draw extending archery system enables a user to draw a draw string multiple times to store energy. Embodiments of the system include a transmission that operatively engages the draw string and a flexible limb. From an initial rest position, the user initiates a charging stroke on the draw string. During a first charging stroke, the transmission engages to store energy during the draw. At the end of the charging stroke, the transmission engages to prevent release of stored energy. The transmission also disengages the draw string to enable a subsequent charging stroke from an intermediate rest position. From a final rest position, the user initiates a firing stroke on the draw string. At the end of the firing stroke, the transmission couples the draw string and the flexible limb to release stored energy through the draw string.

主权项

1. An archery apparatus, comprising:
a fixed transmission component having an axis; a first cam, a second cam, a drive shaft, and an output shaft configured to rotate around the axis relative to the fixed transmission component; a first coupling mechanism configured to couple the first cam and the drive shaft in response to rotation of the first cam in a first direction, the first cam free to rotate independently of the drive shaft in a second direction opposite of the first direction; a reduction component configured to couple the drive shaft to the output shaft with a mechanical advantage over of the output shaft; a second coupling mechanism configured to couple the second cam and the output shaft in response to rotation of the output shaft in the first direction and decouple the second cam and the output shaft in response to rotation of the second cam in the first direction past a selection point to free the second cam to rotate independently of the output shaft in the second direction; and a third coupling mechanism configured to couple the second cam and the fixed transmission component at one or more intermediate charging positions to prevent rotation of the second cam in the second direction prior to rotation of the second cam past the selection point in the first direction.