GB538910A - Automobile lifts - Google Patents

Abstract

538,910. Automobile lifts. JACKSON, A., and MAKAROFF, V. S. Feb. 19, 1940, No. 3115. Convention date, March 6, 1939. [Class 78 (iii)] An automobile lift comprises pivotally supported front arms 6 and rear arms 4 and a pair of rails 1 pivotally supported by the arms 4, 6 and adapted to support a vehicle, the rails and arms forming two hinged parallelograms and a motor 19 being connected to the arms and rails for changing the angle between them in order to raise and lower the rails. As shown, the arms 4 are secured to a shaft 7 supported in bearings 8 in a floor 11 and the arms 6 are each secured to a short shaft 13 supported in bearings 8. The motor 19 is actuated by fluid pressure and comprises a cylinder, hung on a shaft 20 carried by the side bars of an arm 4, and a piston 25 the rod 36 of which is pivotally connected at 3<SP>1</SP> to a rail 1. A pit 21 receives the cylinder 19 when the lift is lowered. The piston rod 26 comprises spaced bars having a number of holes 34, and plates 28 carried by the shaft 20 are provided with pivots 29 for dogs 31 adapted to engage holes 34 to lock the piston when the supply of pressure fluid to the cylinder 19 is cut off. The dogs are releasable by a double cam member 36 rotatable on the shaft 20 and connected by an arm 37 and pull rod 40 to an arm 41 mounted on a rock-shaft 42 and actuated by a pedal 44 or by a fluid-pressure cylinder and piston connected to the arm 37. The rails 1 may carry outer Z-rails 2 for supporting the wheels of a car, and ramps 17 pivoted at 16 to lugs 14 on the arms 4 are raised to the level of the rails when the lift is lowered. The alignment of the front or rear arms may be adjusted by providing elongated holes for the pivots 5 and adjustment bolts 50 carrying nuts engaging end flanges 51 on the rails. Motor cylinders 19 may be mounted one on each of the rear arms 4 or the front arms 6, or one on a rear arm 4 and one on the front arm 6 on the opposite side. In the latter case, the releasing cylinders for actuating. the arms 37 are mounted on the cylinders 19 and a control valve supplies pressure fluid alternatively to the cylinders 19 or the releasing cylinders.