Patent GB-563125-A (GB)
Title: Material handling and loading apparatus
IPC: E02F3/342
Filed: 1942-08-21
Abstract: 563,125. Reversing gear. ATHEY TRUSS WHEEL CO. Aug. 21, 1942, No. 11826. Convention date, July 2, 1941.. [Class 80 (ii)] [Also in Groups XXI, XXX, XXXI and XXXIV] Reversing-gear H, having different speeds for the two directions of rotation, for driving a winch which raises and lowers the boom D of a self-propelled loading-machine, is controlled by a hand lever 289 and also automatically by trip gear operated when the boom reaches a set position or positions, the hand lever control overriding the automatic control when desired. A brake may be automatically applied to the winch shaft when the reversing clutch is disengaged, and released when the clutch is re-engaged. The reversing-gear comprises a driving-shaft 86, Fig. 10, carrying pinions 93, 94 which can be clutched to the shaft 86, the pinion 94 driving a shaft 116 through an idler 114 and a pinion 115 (not shown) on the shaft 116, while the pinion 93 drives the shaft 116 through gears 117, 119 fixed to a countershaft 118, the gear 119 meshing with the idler 114. The reversing-gear clutches 91, 99 are controlled by sliding rings 107, 108 selectively operated by a collar 101 slidably keyed at 102, 103 to sleeve 89 fixed to the shaft 86. The collar is rounded on its inner edges to allow it to ride up on rollers 104, 105 linked together and working in a slot 106 in the sleeve 89. When the clutch fork 111 is rocked by a shaft 112 the collar is moved to one side or the other and forces the corresponding roller 104 or 105 to shift the ring 107 or 108 and cause the clutch 99 or 91 to engage. The clutch fork shaft 112 carries aT-lever 113, Fig. 4, which is controlled either by a hand lever 289 through a cable 290, or automatically by a rod 294 or a cable 309 operated when the boom reaches one or more predetermined positions. Springs 296, 308 are provided in the automatic controls so that the operator can keep the desired gear in action, if desired, by overcoming the spring resistance by pressure on the hand lever. As the boom D is raised a stop thereon strikes an arm 291, Fig. 4, when the boom is fully raised and depresses a rod 294 to disengage the raising clutch 91 and stop the boom at the highest point. Similar arms 291 may be provided to stop the boom at intermediate points, these other arms being connected to the first or upper arm by links 298, 306. The driving-gear is also disconnected when the boom and bucket have reached their lowermost position, a block on the boom being adapted to strike a lever connected by a cable to the T-lever 113 of the reversing clutch. In a modification, Fig. 35, the reversing-clutch shaft 112 is controlled conjointly with a band brake 351 on the winch shaft. Normally the brake is held applied by a spring 368 acting on a lever 358. When the hand lever 289 is rocked in either direction for raising and lowering the boom, the shaft 112 is rocked through'levers 378, 381, 383 and a cam 'lever 373 is also rocked so that one or other of two noses 387 thereon engages a notch in an arm 365 of the lever 358 and releases the brake 351. If the boom is being raised the stop thereon finally engages a cam lever 392, raises a rod 389 and disconnects the raising clutch, at the same time allowing the brake to be applied by its spring. When the boom is lowered by power the clutch is disengaged and the brake applied , as soon as the boom and bucket rest on the ground since the tension on the cables 148 supporting the boom is then released and allows a spring-loaded fork 245 carrying a tensioning pulley 230 to swing downwards so that a cam 399 thereon engages a lever 398 and rocks the clutch shaft 112 through links 395, 389.