Patent GB-727017-A (GB)
Title: Jacking and traversing devices for motor vehicles
IPC: B60S9/06
Filed: 1951-04-16
Abstract: 727,017. Vehicle jacks. SCHELLENBAUM, H. April 16, 1951 [April 22, 1950], No. 8859/51. Classes 79(2) and 79(3). [Also in Group XXX] A motor vehicle parking device comprises an axially displaceable and rotatable member which is mounted in a swivelling manner at one end of the vehicle so that when out of use it lies in a horizontal position and it can be brought into use by moving into a nearly vertical position and by being given a comparatively small axial movement it can contact the ground to lift the end of vehicle and by rotating the member a traversing movement is imparted to the end of the vehicle. In one embodiment, Figs. 5, 7, and 9, a ground engaging disc 2, is mounted on a rotatable and axially displaceable tube 3a carrying a nut 34 engaging a threaded spindle 30, the tube being guided by an extension 35 of a casing 1 pivotally supported in bearings 5 in a frame 4 mounted on a frame cross member. Secured to the spindle 30 is a bevel gear 27 mounted in a thrust bearing 28 in a removable cover 29 of the casing 1. The bevel gear 27 meshes with a gear 26 on a spindle 25 carrying a wormwheel 24 with which a worm 23 engages. The worm 23 is driven from a grooved pulley 16 on the engine crankshaft through reversible friction gearing. The gearing comprises friction wheels 9, 10 tapered peripherally and having intermeshing teeth and the wheels 9, 10 are mounted on a bracket 18 pivoted at 17. The arrangement is such that the wheels 9, 10 are alternatively brought into engagement with the wheel 16 by pivotal movement of the bracket 18 by means of a rod 23<SP>1</SP>, the wheel 10 being connected to the worm 23 so as to give a reversible drive thereto. In an alternative arrangement, Fig. 8, the wheel 10 can be brought into selective engagement with either the wheel 16 or a similarly grooved wheel 9a mounted on the engine crankshaft and meshing with the wheel 16. The rod 231 can be operated mechanically, through a linkage 19a, 19b, or electrically, by selective operation of solenoids 21, 22 to attract a common armature on the rod. The arrangement is such that the device can be moved from an initial horizontal position, Fig. 5, to alternative operating positions a, b, depending on whether a right or left handed transverse movement of the front of the vehicle is required. The spindle 30 is provided with a bore 36 in which is mounted a headed rod 37 which carries a ring 38 abutted by springs 39, 40 of which the spring 39 is the stronger. Spring-loaded plungers 42, 43 are provided on the frame 4 and alternatively engage a recess in the cover 29 when the rod 37 is retracted, thus locking the device in either operative position. The operative plunger is selected by means of an electromagnet armature 56 which is either extended to engage a stop 57 on the casing 1 when position a is to be taken up or retracted when position b is to be taken up. With the device in the full line or retracted position in Fig. 5, the rod 37 engages a recess 44 in the frame 4. The rod 37 is retracted from the recess by an initial limited axial extension on coupling the drive and subsequently the device is rotated by the drive turning the wormwheel 24 until the desired operative position is reached, and then the drive extends the tube 3a by rotation of the spindle 30 untilfthe front of the vehicle is lifted and dogs 32, 33, on the spindle 30 and nut 34, respectively, engage and the disc 2 is rotated to the desired amount to traverse the vehicle front. The tube 3a is prevented from rotation during the lifting or lowering operation by a brake comprising a spring urged brake block 51 on the extension 35 engaging the tube, an annular depression 54 being provided on the tube for rotation of the tube for traversing. Instead of the dogs 32, 33 the thread pitch of spindle 30 may be at least 20 degrees, and the spindle and nut become engaged by abutment for rotation of the disc. The thread pitch of the spindle may be so selected that a smooth transition from lifting to traversing movements is obtained. In a modification, Figs. 1 and 2 (not shown), a parking device having a ground engaging disc is operated hydraulically from the engine lubricating pump which supplies oil under pressure through a distributor to a reversible helical rotor hydraulic motor. Specification 652,379 is referred to.