Patent GB-356240-A (GB)
Title: Hydraulic jacking apparatus for motor vehicles
IPC: B60S9/12
Filed: 1930-05-31
Abstract: 356,240. Jacking apparatus on motor vehicles. THARRE, K. E., 5, Adolf Frediks Kyrkogata, and ANDERSSON, S. E. V., 139, Ringvõgen, both in Stockholm. May 31, 1930, No. 16925. [Class 79 (iii).] Hydraulic jacking apparatus on a motor vehicle comprises, in combina. tion, plungers movable in vertical cylinders attached to the wheel axles adjacent to each wheel, conduits connecting both ends of each cylinder tc a motor driven pump or the like on the vehicle, with valve control means, operable from the driver's seat, interposed, enabling the fluid under pressure to be directed to the upper or the under side of any plunger to raise or lower any desired wheel of the vehicle. The cylinders may be attached to the axles by screw bolts 6 in conjunction with a clamping plate as shown in Fig. 1, or by means allowing adjustment of height as shown in Fig. 5, wherein U-shaped bolts 51 embrace the cylinder 1 which is formed with teeth 48 adapted to engage teeth 49 on a block 50 seated against the axle 5. Within each cylinder, a piston 2 is attached to a plunger rod 3 terminating in a foot or base 4. Conduits 7, 11 lead from opposite ends of the cylinder to the valve control means, whereby fluid may be admitted to either side of the piston 2, the valve casing 9, Fig. 1, being connected to four such cylinders, any one of which may be brought into operation by rotary adjustment of the valve plug 10. A second valve 20 in series therewith determines the direction of flow to the upper or the under side of the piston.. A pump 35, provided with non-return valves 36, 37, and having a reciprocatory piston 38 operated by an engine-driven eccentric 39, draws fluid from a tank 33 and delivers it through a pipe 24 to the valve casing 19 wherein, according to the adjustment of the plug 20, it may be delivered through the passage 22, 21 either to the pipe 16 or the pipe 25. In either case, the pipe 25 or 16 not so connected to the supply pipe 24 is placed in communication through a part annular groove 30, Fig. 2, in the valve plug, with a return conduit 31 to the tank. Thus, if the pressure fluid is directed through the pipe 16, it is admitted to the lower end of the valve plug 10 and thence conveyed by the passage 14, 13 to the conduit 7 leading to the upper end of one of the cylinders 1 according to the rotary adjustment of the plug. Alternatively, if the pressure fluid is directed through the pipe 25, it is admitted to the valve 10 by an inlet 27 opening into an annular passage 29 in the plug whence, by means of a longitudinal passage 28, the fluid is conveyed to one of the conduits 11 leading to the lower ends of the cylinders according to the adjustment of the plug. By this arrangement, to whichever end of the cylinder the pressure fluid is admitted, the other end is placed in return communication with the tank 33. The valve plugs are respectively provided with operating handles 41, 44 moving over indicator plates 42, 45. In a modification, Fig. 7, the control is effected by means of a single valve. In this arrangement, the four pairs of conduits from the jacking cylinders are disposed in a single plane 8 .. 8 transverse to the axis of the rotary valve plug, the two conduits of each cylinder being diametrically opposed. Fluid under pressure is delivered to the valve from the pump through an axial conduit 16 and thence, through the angular passage 58, 57, may be supplied to any of the conduits, thus to either end of any of the cylinders. Simultaneously a longitudinal passage 69 on the opposite side of the plug is brought into alignment with the other conduit from the same cylinder, placing it in communication, by means of an annular groove or passage 67 in the plug, with a return conduit 25 leading to the fluid storage tank. In this form of control, one end a of the valve operating handle 70, Fig. 9, is moved over the indicating points on a dial 73 for " raising " and the other end b is brought over the same points for " lowering."