Patent GB-1123721-A (GB)
Title: Improvements relating to parking apparatus for motor road vehicles
Inventor: BUTTERWORTH ARCHIBALD JAMES
IPC: B60S9/21
Filed: 1964-08-27
Abstract: 1,123,721. Parking apparatus for motor road vehicles. SIDLER Ltd. 26 Nov., 1965 [27 Aug., 1964], No. 35114/64. Heading B7D. A parking apparatus for passenger cars or semitrailers comprises a pair of groundengaging rollers mounted on the vehicle so as to be movable from a retracted to a lowered position to lift a pair of road wheels from the ground and move the adjacent end of the vehicle sideways on rotation of the rollers, wherein the rollers, their mountings and a power mechanism for lowering the rollers, are carried on the sprung part of the vehicle, and parts carried on the mountings of the rollers engage unsprung parts of the vehicle adjacent the said wheels towards the end of the lowering movement of the rollers to lift the unsprung parts and hence the wheels. In an embodiment, each roller 9 is mounted on a forged arm 1 is supported at 2, 3 on a pivot pin 4 integral with the housing 6a of a flexible bush 5 secured at 7 to a chassis member 42, the pin 4 being attached to a rubber bush 10 on the member 42. The roller 9 engages and is driven by the rear tyre 32. A jack roller 24 mounted at 22, 23 on the arm 1, constitutes the carried part which is engageable with a ramp 25 attached to a spring plate 39. An hydraulic ram 29 forming the power mechanism is secured to a ball 26 on the arm 1 and to a sprung part of the chassis, and a cable 1b is connected to the arm at 1c and to a retraction spring. The arm 1 is mounted inboard of the road spring 37. In another embodiment, the arm is mounted outboard of the road spring, and is journalled in a T-piece resiliently secured to the car floor 49. The arm comprises a flattened forging welded to a tube welded to a further forging in which the spindle of the roller is carried in nylon bushes impregnated with molybdenum disulphide. Each hydraulic ram is supplied via a dash mounted control knob which when operated directs the output of an oil-pump driven by the car engine to each ram. The jack-ramp may be bolted or welded to the spring plate or to the brake back plate. In a modification, the arm is journalled in a nylon and rubber journal 95, 96 located near a vertical panel of the car chassis. The hydraulic ram is secured at one end to a ball on the arm and at the other to a C-piece secured to the chassis. The ram comprises two pistons working in a cylinder, and interlocked so as to extend and retract in succession. In another embodiment, the complete parking apparatus comprises a pair of unlike apparatus, the nearside one of which corresponds to the second embodiment. The offside apparatus is located behind the real axle to obtain correct direction of rotation of the roller. In another embodiment, a front wheel drive car comprises angled rollers, and a single ram 205 is employed. In a further embodiment, a jack roller is carried on a strut pivoted to the arm and loaded by a spring, and on retraction engages a trackway on the car. In yet another embodiment, a V-shaped carrier corresponding to the T-piece is resiliently pivoted to the chassis. In a further embodiment is shown the construction of an arm carrying a roller. In yet a further embodiment, the parking apparatus is applied to a rear wheel driven vehicle having independent rear suspension, wherein one apparatus is mounted in front of, and one behind, the rear suspension. One end of the single ram is attached to the rearward lever of an offset bellcrank, and the other end to one arm. The lever is linked to the other arm.