Patent GB-187180-A (GB)
Title: Electric hoisting device
IPC: B66D3/22
Filed: 1922-03-03
Abstract: 187,180. Bomborn, B. March 3, 1922. Winches; driving-gear; brakes; stopping automatically at end of run; regulating and controltransmitting gear.-Comprises a construction and arrangement of parts forming an electric hoisting device of the kind in which the motor and epicyclic transmission gear are mounted wholly or mainly within the hoisting drum and the latter is fitted with an internally-toothed ring by means of which it is driven from the enclosed gearing. The present construction provides an arrangement of gearing which gives a high speed transmission ratio and allows the high speed wheels to run in an oil bath while permitting the removal of the main parts of the gear as an integer for convenience in effecting repairs. The gearing also is used to actuate automatic stop mechanism at the end of the wind. Methods of mounting the drum and of fixing a casing round the drum also are referred to. Fig. 2 shows one construction in which the motor 5 drives a sun wheel 20 gearing with planet wheels 21 carried by shafts mounted in inwardly-projecting walls on the drum which form an enclosed oil bath. The planet shafts project to the exterior of the bath and carry pinions 23 driving a loose toothed ring 25 which drives the drum through the pinion 26, multiple pinions 27, and toothed ring 31. The drum thus receives a rotation due to the combined axial and planetary rotation of the wheels 21, which gives a high transmission ratio. The drum is supported near one end on a flange 3 projecting from the motor casing, and at the other end on a long sleeve 16 projecting inwardly from the end plate 7. By removing the bolts from the stay rods which connect this end plate to the motor casing 6, the whole of the transmission gear, with the exception of the planet wheels 21 and pinions 23, can be withdrawn as an integer. The upper stay rod is fitted with parallel stiffening plates to carry the suspending eye 35, while the lowest rcd is fitted with an iron-bound wooden frame to prevent the hanging load sheave from contacting with the drum at the top of the wind. In a slightly modified construction a sheet metal casing surrounding the drum is gripped between the plates 6, 7 which are each modified for this purpose. In another modification these plates 6, 7 are formed with flanges paraUed to the plane of the paper, for fixing the whole appliance on to a wall. The pinion 26 can be used to actuate automatic stopgear of the travelling screw type which is arranged in a casing 47 secured to the end plate 7. A spur train, shown in Fig. 8, is geared to the pinion 26 between two of the pinions 23, and drives the screwed shaft 49. When the nut 50 contacts with one or other of the stops 55, the whole casing 57 rotates with the screw. This causes a toothed segment 62 to rotate the motor controller 63 into the neutral position, and also brings a depression on the casing into register with a roller 60, thus allowing a weighted lever 48, Fig. 7, to apply brake blocks to the drum 19, Fig. 2, on the end of the motor shaft. The casing 57 is furnished with levers and cords 65 for rotating it by hand to effect the control at any time under the usual working conditions.