Patent GB-567113-A (GB)
Title: Improvements in or relating to wagon tipplers
IPC: B65G67/00
Filed: 1943-05-15
Abstract: 567,113. Wagon-tipping apparatus; lifting cradles. RUSSELL, H. H. May 15, 1943, No. 7774. [Class 78 (iv)] Relates to railway wagon tipplers of the type including a base structure constituting a seat for a railed wagon-supporting and tipping platform or cradle 10 adapted to be raised and lowered and tipped by means of a crane, and provided with wagon-locating means so arranged that the platform may be tipped about an axis 11 located near the front end of the platform. According to the invention, the wagon-locating means, for engaging the leading axle 12 of a wagon, includes a first axle-engaging member 21, connected with the platform lifting tackle so as to be moved into operative position when the lifting tackle is tensioned, a second axle-engaging member 28, and means for locking and unlocking the axle-engaging members, which means are dependent for operation on engagement with and disengagement from a part 34 of the stationary base structure for the platform. As shown, the platform 10 is supported,' from a cross-bar coupled to a crane, by two pairs of ropes 13, 14, the forward rope 13 at each side being coupled to the pivot 11 and the rear rope 14 at each side to the rear end of the platform by a rock-link 16 connected by a link 16a and arm 16b to a common spindle 17. Tipping of the platform is effected by additional ropes 18 connected at 19 to the rear end of the platform and led upwardly around guide pulleys. Two sets of wagon-locating means are provided at the front of the platform, each set including the members 21, 28 which are in the form of levers. The lover 21, having an axle-engaging hook 22, is pivoted on a cross-shaft 23, counterbalanced by a weight 23a, and connected by arms 24, 25 and a link 26 to the spindle 17. The double-armed lever 28 is pivotally mounted at 27 and provided with a counterweight 30 and with a hook 29 engageable with the axle 12 on the side opposite to that engaged by the hook 22 to prevent rearward movement of the wagon on the platform 10. The cross-shaft 23 carries a stop 31 engageable by a pawl 32 to lock the lever 21 in axle-gripping position, the pawl, which is pivoted at 33 and connected by a link 35 with the lever 28, being supported, when the platform is resting on the base structure, by the part 34 of the base so as to maintain the lever 28 clear of the path of the axle 12. When the platform and wagon are raised from the base, the lever 21 is locked in axle-intercepting position and, as the pawl 32 is no longer supported by the base, the lever 28 rocks and its hooked end 29 rises into axleintercepting position. The leading axle 12 is thus caught between the hooks 22, 29 and held against movement during tipping. When the platform is lowered on to the base, the pawl 32 re-engages the base part 34 and, in so doing, releases the lock on the lever 21 and constrains the lever 28 to descend to inoperative position so that the wagon may be withdrawn from the platform, the lever 21 dropping to inoperative position under the action of gravity. For locking the pawl 32 in operative position, there is pivoted at 36 on the pawl, a spring-urged detent 37 which is also engageable with the base part 34 and with a step 38a on a spring- urged arm 38 pivoted at 33 and connected by a link 40 with a feeler 41 pivoted at 42 on the hook 22 and engageable by the axle 12 when the axle engages the hook. When this occurs, the feeler 41 is displaced, arm 38 rocked, and the detent 37 engages the step 38a on the arm and so locks the pawl 32. The detent 37 is engageable with the base part 34 before the pawl 32 engages therewith and thus frees the pawl so that the pawl is released when it, in turn, engages the base part.