Patent GB-205174-A (GB)
Title: Improvements in engine turning gear for aeroplane and like engines
IPC: B64D45/06
Filed: 1922-07-10
Abstract: 205,174. Salmon, P. July 10, 1922. Turning-gear.-A starter for aeroplane and like engines is mounted on a vehicle, truck, or the like and comprises an internal-combustion engine, an electric motor, or other power unit, an upright or inclined telescopic mast, a laterally projecting telescopic shaft driven by the power unit directly or through a shaft within the mast and adapted to be coupled to the aeroplane pro. peller shaft or engine shaft, and hydraulic or other power means for extending and collapsing the mast and the shafts and for swinging the projecting shaft horizontally and vertically. In one form, Fig. 1, the telescopic starter shaft 12, 31 is driven from the engine of a motor-car through spur-and-bevel gearing 3 allowing for reversal, a telescopic vertical mast 10, 11 within the telescopic mast 23, 24, bevel gearing 13, 14, a spring-loaded safety clutch 17, and a universal joint 19, 20. The outer end of the starter shaft 31 is squared at 35 to carry a slidable sleeve 36 with a certain amount of universal movement, the sleeve 36 carrying a gimbal ring 38 with a driving pin for engagement with a clutch on the engine shaft, and the sliding movement being controlled by springs 40, 41. For raising and lowering the mast member 23, oil under pressure is admitted to and from the annular space 420 connected by a channel 44 in the gland 45 to an annular space 42, the member 23 being held or released by a hydraulic band brake 47. For turning the shaft 12 and the member 23 about the mast 24, oil is admitted to one or other side of a vane 48 mounted on a sleeve 50 slidingly keyed to the member 23 and movable in a casing 49 on the member 24. For swinging the shaft 12 upwards about its horizontal pivot, oil is admitted to a cylinder 56 and forces out a piston 55 connected by links &c. to the shaft 12. The piston is held in any position by a hydraulic band brake 61. The shaft 12 is counterweighted, and is lowered by its own weight when oil is allowed to escape from the cylinder 56. For extending the shaft 31, oil is admitted behind a piston 33 in the hollow shaft 12. The oil is supplied by a pump driven from the gear box 3 and is controlled by valves 67 - - 71. A clamp 98 may be used to connect the parts 23, 24, of the mast for removal from the car. In a modification, Fig. 7. the starter shaft 101 is driven from an electric motor 100 through reduction gearing 102 and a friction clutch 103 controlled by a handle 177, and is pivoted upon a fork 106 carried by a vertical or inclined telescopic mast 107, 108, on a hand-propelled truck. Oil for extending the mast, for tilting and extending the shaft 101, and for folding the apparatus down on the truck, is supplied by a pump 151 mounted on and driven bv the motor 100. The mast member 107 is fixed to a bracket 116 which carries the front axle 117 of the truck and is pivoted at 119 upon a fork fixed on a horizontal tube 121 forming the body of the truck. The fork is hollow and serves as a reservoir for the operating liquid. To enable the mast to be folded down on the truck, as shown in broken lines, the bracket 116 is connected by a link 148, a slide block 150, and a rod 146 to a piston 145 actuated by the admission of oil under pressure, to the tube 121. The rear wheels are carried by stub axles swivelling in forks on a rear axle 126 fixed to the tube 121 and having arms 129 connected to a steering frame or handle 130, which can be held by one of the spring clips 132, 133 on the casing 104 and the tube 121. Magnetic brakes 124, with pivoted shoes 125 for engagement with a ship's deck or the like, are fixed on the axles 117, 126.