Patent GB-652379-A (GB)
Title: Lifting and traversing device for motor vehicles
IPC: B60S9/18
Filed: 1947-10-14
Abstract: 652,379. Screw jacks. JEZLER, H. Oct. 14, 1947, No. 27552. Convention date, Oct. 31, 1946. Addition to 649,102. [Class 78 (iii)] [Also in Group XXXI] Relates to an improvement in a modification of the lifting and traversing device, as described and claimed in the parent Specification, characterized in that the device is driven by a reversible motor. A spindle 2, Fig. 1, having an upper threaded portion, at the head of which is a friction coupling 5, and a disc 6 fixed to its lower end, is mounted in a housing 1 and coacts with a nut formed as a worm wheel 3 driven by a worm by means of a reversible electric motor 4 fixed to the side of the housing 1. The disc 6, Fig. 4, carries a plurality of rotatable pads 36 around the periphery. The housing 1 is slidably supported in an arcuate guide channel 9, Fig. 3, slotted in its bottom surface at 10 and mounted in the chassisframe. Arcuate guides 8 on the lower end of the housing engage with the edges of the slot 10 and are retained in position by arcuate rails 11 so that the housing pivots about a transverse axis near the middle of the device. The device may be inclined forwardly or rearwardly by a push-and-pull rod 15 connected to a member 14 on the housing 1. A spring-loaded locking bolt 16 supported by the member 14 engages with a notch 17 or 18 (not shown), when the housing is in its fully inclined positions and so secures the device against movement when in these positions. As the spindle 2 is lowered to the road by the worm wheel nut 3, to raise the front end of the vehicle, it is prevented from rotating by the friction coupling 5. When the coupling 5 contacts the worm wheel 3 the spindle and disc commence to rotate and thus traverse the vehicle to the left or right according as to the inclination of the housing 1. When the vehicle has been sufficiently traversed the motor 4 is reversed and the spindle is returned into the housing and the vehicle is thus lowered to the ground. The housing instead of being supported by the guide 9, may be pivoted about a transversely positioned pin supported at the middle of the housing. The Specification as open to inspection under Sect. 91 describes a modified lifting and traversing device rigidly supported in the vehicle chassis frame and permanently inclined to the vertical so that when the disc is lowered to the roadway to lift the front end of the vehicle, only one side of the disc makes contact with the roadway. Left or right traversing is effected by altering the direction of rotation of the disc. As shown in Fig. 4 (Cancelled), two hollow concentric spindles 29, 30 having upper end stops 32, 33 and lower end stops 34, 35, respectively, are mounted in the housing 1. The two spindles have oppositely cut threads preferably multi-start, the threads of the spindle 30 co-acting with the threads of the nut formed as a worm wheel 3 driven by a worm 31 by means of the reversible motor (not shown), and with the threads of a screw clamp ring 39. The threads of the spindle 29 co-act with threads formed on the inside of the lower end of the spindle 30. The lower end of the spindle 29 is rigidly connected to a disc 6 having a series of rotatable plates 36 with rubber pads and in which disc is pivoted a spring-controlled pawl 20. Mounted inside the hollow spindle 29 is a rod 37 longitudinally slidable but not relatively rotatable therewith, which rod has at its upper end a conical friction coupling 38. In operation, for one direction of rotation of the motor 4, the spindle 29 is moved downwardly, since its rotation is hindered by the rod 37 and the friction coupling 38, until the vehicle is lifted and the stop 32 abuts the ring 39. The outer spindle 30 cannot screw upwardly since the stop abuts the worm wheel 3. When the stop 32 abuts the ring 39 continued rotation of the worm wheel 3 overcomes the friction of the member 38 and the assembly rotates within the housing, thereby rotating the spindle 29 and disc 6 to traverse the vehicle. When the vehicle has been traversed the motor is reversed and the spindle 29 is screwed into the housing assisted by the weight of the vehicle. The spindle 30 is prevented from downward movement by the screw clamp ring 39 preventing relative rotation between the spindle 30 and the nut 3. If the motor is initially rotated in the other direction, the outer spindle 30 is screwed downwardly, but the inner spindle 29 is prevented from upward movement by the stop 34 abutting the stop 35. The spindle 30 moves downwardly until the vehicle is lifted and the stop 33 abuts the ring 39 whereupon continued rotation of the worm wheel 3 overcomes the friction of the member 38 and the assembly rotates within the housing, thereby rotating the spindle 30, spindle 29 and the disc 6 to traverse the vehicle in the opposite direction. After traversing the vehicle the motor 4 is reversed and the spindle 30 is screwed back into the housing, assisted by the weight of the vehicle. The spindle 29 is then prevented from downward movement by means of the pawl 20 coupling the two spindles. The means by which the pawl 20 couples and uncouples the two spindles is not clearly described. This subject-matter does not appear in the Specification as accepted.