Patent ID: 8336463

Claim:
A zipline trolley system comprising: a cable extended between a first point and a second point; a trolley comprising: one or more wheels that travel on said cable; and a frame attached to said one or more wheels, wherein said frame comprises a front plate and a back plate; a launcher fixed to said first point and comprising: a substantially cylindrical inner body fixed to said first point; a rigid outer body adapted to rotate about said inner body; a return spring, wherein one end of said return spring is attached to said inner body and other end of said return spring is attached to said outer body, and wherein rotation of said outer body about said inner body tensions said return spring; and a retention mechanism connected to said outer body and adapted to clasp onto said back plate of said frame when said return spring is not tensioned; and a catch block fixed to said second point and comprising: a block fixed to said second point; a left retaining arm and a right retaining arm, both pivotably connected to said block and adapted to clasp onto said front plate of said frame; a left spring, wherein one end of said left spring is attached to said block and other end of said left spring is attached to said left retaining arm, and wherein pivoting said left retaining arm away from said block tensions said left spring; and a right spring, wherein one end of said right spring is attached to said block and other end of said right spring is attached to said right retaining arm, and wherein pivoting said right retaining arm away from said block tensions said right spring.