Patent GB-571831-A (GB)
Title: Improvements in and relating to loading apparatus
IPC: B66F9/02
Filed: 1943-09-30
Abstract: 571,831. Hoisting apparatus. SMART, F. T. Sept. 30, 1943, Nos. 16061 and 18328. [Classes 78 (iii) and 78 (v)] Hoisting apparatus suitable for raising sacks from ground level to a lorry comprises a wheeled frame, a power-driven winding gear, a framework fixed to the frame and adapted to stand vertically on the ground when the frame is horizontal, a lifting frame which is slidable on the framework and carries a load supporting platform, and control gear for the winding mechanism whereby the raising and lowering of the platform is controlled manually and its stoppage is controlled automatically. A secondary lifting frame carrying a loading platform may move up and down with the main frame or relatively to it. The main platform 16, Fig. 1, is carried by a frame 12, the side members 11 of which engage rails 10 fixed to frame members 5. When the hoist is in use, the members 5 are vertical and a base member 6 at their lower ends rests on the ground. The member 6 is connected by bars 7, Fig. 3, to the frame 1, and has a draw-bar structure 8 attached to it. A ramp 18 hinged to the member 6 is lowered on to the ground when a barrow is to be wheeled on to the platforms. A similar ramp 20 hinged to a frame upstanding from the base 6 is turned to rest on the floor of the lorry when the hoist is in use. A cross-bar 9 at the top of the members 5 is connected to the frame 1 by stays 39 and supports a pair of pulleys 19 over which pass cables 21 attached to the member 11 and winding drums 58. A secondary hoisting frame 15 carrying a platform 17 is movable in channel members 13, 14 forming part of the frame 12. A cable 24 which passes over a pulley 23 mounted on the frame 12 has one end attached to a bar 26 and the other anchored to the frame through the medium of a cushioning spring 25. A pin 28 on the bar can be engaged either with a slotted lug 29, Fig. 4, on the fixed frame of the hoist or with a similar lug 30 on the frame 12. If the pin is engaged with the lug 30, no relative movement between the frames takes place when the frame 12 is hoisted, and the platforms rise together. In this case the attendant, who stands on one platform, wheels the load from the other platform over the ramp 20 on to the vehicle. If, however, the pin is engaged with the other lug, the frame 15 will rise at twice the speed of the frame 12 and at the end of its travel the platform 17 will be as much above the platform 16 and ramp 20 as the latter are above the base 6. The attendant, who is now standing on the platform 16, can take the sack on his shoulders from the platform 17 and deposit it on top of the sacks which are already on the lorry. The winding drums 58 are driven through worm and belt gearing by an internal combustion engine (not shown) mounted on the frame 1. The open and crossed belts of the gearing are shifted by forks 61, 62, Fig. 8, on a slidable bar 59 which is connected by a link 60 to an arm 44 fast on a shaft 43. An arm 42 on this shaft has a pin-and-slot connection with the lower end of a rod 31 which is slidably mounted on the frame. Collars 32, 33 are adjustably mounted on the rod, and are engaged at the limits of the wind by a fork 34 on a bar 35. A pin 36 on the bar engages the forked end of a pivoted member 37 which is provided with operating handles 40, 41. A counterweight 46 is suspended from another arm 45 fast on the shaft 43. The bar 59 is held in any one of three set positions by engagement of a spring-pressed roller 64 with its notched end. In a modification (not shown) the hoisting cables and winding drums are replaced by screws.