Abstract: An improved self-locking scaffold bracket employing a load activated lock in combination with a foot operated hoisting device which may be hoisted without lost motion relative to the support. The scaffold bracket utilizes a rigid frame directly supported upon a lock which clamps to an upright post. The scaffold can be raised by a hoisting device of the block and tackle type or by a foot operated hoisting mechanism of the type which "walks" up the post. The hoisting device engages the lock in a manner causing the lifting force to be exerted at a trunnion axis of the lock which is so situated that it eliminates lost motion and tilting during the hoisting operation.

Abstract: Apparatus is described for climbing a sailboat mast or other vertical structure. The apparatus includes a track which extends upward along the mast and a pair of climbing devices which are usable by an operator to raise himself up along the track. Each of the climbing devices includes a carriage which is mounted on the track for sliding movement therealong and a lever bar pivotally mounted to the carriage for locking the device at any selected location along the track. The locking action is obtained by the application of downward force on the locking lever causing an end of the same to frictionally engage the track. One of the locking levers is adapted to receive the feet of an operator, whereas the other is adapted for hand grasping. The apparatus is used by the operator engaging his feet and hands with the foot and hand devices respectively and then climbing the mast by alternately sliding the foot and hand devices upward along the track.

Abstract: A device for climbing a tree, pole, or other vertically elongated generally cylindrical device is disclosed which comprises an operator's basket, a pair of identical hangers adapted to encompass the object to be climbed, and to be adjustably supported at selected elevations thereon, one above the other, and a block and tackle assembly which the operator connects between the uppermost hanger and the basket to move the basket with the operator therein relative to the uppermost hanger. The bottom hanger is used to support the basket in a fixed position while the upper hanger and upper block is repositioned further up the tree when climbing or further down the tree when descending. Alternate moving of the hangers, which alternately supporting the basket from one and then the other of the hangers, followed by raising or lowering the basket with the block and tackle assembly enables the operator to climb or descend the tree.