Patent GB-397280-A (GB)
Title: Arrangement on motor cars for lifting same
IPC: B60S9/10
Filed: 1932-07-01
Abstract: 397,280. Fluid-pressure jacking- apparatus on motor vehicles. WASSER, A. and HALLER, W., Reinach, Aargau, Switzerland. July 1, 1932, No. 18667. [Class 79 (iii).] In jacking-apparatus on motor vehicles in which telescopic jacks arranged adjacent to the wheels are connected by conduits to a liquid pressure pump incorporating a pressure distribution chamber, the valves for selective operation of the jacks are actuated by electromagnets controlled by distant switch apparatus. A lamp indicates when pressure exists in the distribution chamber and a cut-out is provided to stop the pump when the pressure becomes excessive. The pump and distribution chamber, Figs. 1 and 4, are provided in a cylindrical body 1 secured by bolts 2 on an annulus 3 and base 4 carrying an oil reservoir 5. Spring- returned pistons 8 operated by a cam-shaft 9 work in cylinders 7 fitted into bores 6. Oil is supplied through a central tube 13 and bore 12, suction valves 22 being mounted in transverse sleeves 21 and delivery valves 26 in axial sleeves 24. The distribution chamber 27 is closed by a cap 15 with a packing washer 28 bolted to the top of the body 1, the outlets to separate conduits 37 leading to the respective jacks being controlled by valves 35 adapted to be lifted by electromagnets 33, whilst a valve 14 controlling the return of fluid to the tank 5 is controlled by an electromagnet 18, a fixed guide sleeve 16 for the valve 14 being carried by the cover-plate. The electromagnets are controlled by a switch box, Figs. 7 and 9, by the driver's seat, mounted in a supporting wall 74 by a clamp 62 secured by a nut on a rod 61. A pointer 51 is secured to a rotatable spindle 43 the inner end of which carries an arm 44 to which is attached a bridge-piece 47 adapted to establish contacts on a fixed plate 48, being pressed thereagainst by a spring 46. The spindle 43 is normally locked in neutral position by a spring-pressed detent 45 engaging a notch in the cover-plate of the box, release being effected by insertion of a key 52. The contact plate 48, carries rearwardly projecting terminal studs 60 which are electrically connected to the respective electromagnets and are associated with strips 66, Fig. 12, leading to contact pins exposed on the front face of the plate, Fig. 9, so that the jacks may be operated individually, in front or rear pairs or all together. In another position, the release valve 14 is operated allowing return of the fluid to the tank. Current is supplied by a contact ring 64 and a second contact ring 65 supplies the motor, a fuse 57 being inserted in terminals 58. In the cover 15 of the pump, a contact 85 made by a plunger 32 when a minimum pressure is established lights a lamp 55, Fig. 7, whilst a contact 86 broken by a plunger 31 when a maximum desirable pressure is reached, stops the motor. The jacks comprise telescopic tubes 68, 69 within a casing 67, Fig. 13, secured to the axles &c., by means of a flange or clamp, retracting springs 76 being arranged between collars 75, 77 secured to the respective tubes with packing rings 78 located between the collars 77 and end rings 79 or plugs 80.