| 摘要 |
A portable climbing device suited for scaling existing overhead structures such as trees, buildings, clifts and the like. Using his legs, a rider cranks a hoisting winch that is equipped with bicycle-like foot pedals to retract a cable by which the device is suspended. Having a curved frame which extends along a narrow region of space from a point above the rider's seat and downwardly behind it, the device tends to deflect any overhead tree branches which may be in a rider's path as he ascends while simultaneously giving him a virtually unobstructed view. Also shielded by the frame is the cable which is guided across a plurality of rollers mounted on the concave side of the frame. The rollers are so positioned that the cable acts on them to stabilize the frame by resisting forces which tend to stretch it longitudinally when the rider's seat is occupied. A V-shaped supporting member extends downwardly a sufficient distance from the frame to allow the pedals to be rotated freely while the device is still resting on the ground and to enable a rider to mount and dismount the device while it is in a low, stable position. The device is also equipped with a manually-operated safety brake that automatically engages a drum about which the cable is wound to lock the cable in position when no action is taken. The device can be moved along the cable only when the brake is released, thus providing a mechanism for preventing sudden, unwanted drops and for controlling the rate of an intended descent.
|
