Patent GB-638703-A (GB)
Title: Jolt feed device for distributors of lubricating compound under pressure
IPC: F16N3/10
Filed: 1946-08-29
Abstract: 638,703. Force-feed lubricators. CHINCHOLE, H. Aug. 29, 1946, No. 26021. Convention date, Dec. 21, 1945. [Class 12 (iii)] [Also in Group XXVIII] Apparatus for supplying lubricant under pressure comprises a pump body, closed at one end and communicating at the other end with the bottom of a tank containing lubricant, said body and tank being reciprocated up and down so that a stationary piston passes in and out of the pump body, lubricant which enters the pump body during downward movement of the body and tank under the action of kinetic energy stored in the lubricant, being forced up a conduit in the piston during upward movement of said body and tank. The pump body b, Fig. 1, is fixed to the lower end of a tank a which may be moved through a distance d, and which is filled with grease and contains a stationary, tube-shaped piston c carrying a valve h. The outside diameter of the piston corresponds to the internal diameter of the pump body b. Initially the grease fills the pump body b, the end of the piston c being clear of the pump body but lying inside the conical end e of the tank ; as the tank is caused to rise (by means described later) the lower end of the piston c is guided by the conical end e of the tank into the pump body b, the grease in which is then forced up, and discharged from the top of the inner channel of the piston ; when the tank has travelled up the distance d the force that raised it is suddenly removed so that it falls back under its own weight, to which may be added the thrust of a spring, until it hits a fixture f; the end of the piston c thus disengages the pump body b and a further supply of grease settles in the latter. In one construction, Fig. 4, the pump body b is secured to a member e supported on shoulders at the tank bottom by a spider v<SP>1</SP>, a cup leather i serving to make the joint water-tight ; the spider v<SP>1</SP> provides the lower bearing for a return spring v surrounding the piston c. The tank may be filled by means of a grease cartridge comprising a cylindrical drum provided with a lid at both ends ; the drum with its lids removed is placed in the tank and the grease passes out automatically under the action of the successive falls of the tank. A mechanical feed device, Fig. 6, comprises a tubular piston u, surrounded by a spring v and attached to a fixed member p, and a tank t which can telescope into a fixed cover s and which carries at its lower end a pump body x having an annular shoulder x<SP>1</SP> which bears on a fixed member q. The cover s is clamped on to the piston u between two nuts, the upper of which is part-spherical so that it can fit into a concave recess in the member p, which has a side recess, the tank, cover and piston being held in place by the spring v, i.e. a vertical downward thrust is sufficient to free the upper nut and allow egress of the piston through said side recess. A block y slides in the member q and is vertically reciprocated through the revolving of a crank D<SP>1</SP> which controls a rod z and which is extended beyond its axis as an arm C. The crank D<SP>1</SP> and arm C rotate in a plane parallel to a disc A which carries a lug B and is rotated in the direction of the arrow. Fig. 6 shows the initial position of the parts. As the disc A turns, the lug B drives the arm C, the block y and hence the tank t being raised ; as soon as the lug B passes through the lower dead-centre the tank is free to drop suddenly under its own weight and the thrust of the spring v until the shoulder x<SP>1</SP> meets the member q. The lug B subsequently re-engages with the arm C and the cycle is repeated. In a pedal-actuated delivery device, Fig. 11, supported on a frame H, the connecting rod z is actuated by a pedal F which can be lowered to F<SP>1</SP>, and pairs of stationary, supporting members L, M are connected permanently to, and extend radially from a rotatable upright K. A plurality of tanks is carried by the members L, M, and each contains a different lubricant, the selected tank being moved to lie above the sliding block y. The block y is so adjusted that when the pedal is in the position N of Fig. 13 the block projects above the frame H, locking the member L and hence the upright K against rotation. To free the member L the pedal is raised to the position R, whereby the block is lowered. When the pedal-actuated device has one tank only the tube for discharge of the grease may deliver into a pressure storage chamber, the chamber being housed inside the upright K and consisting of a pump body and a piston which compresses a strong spring as the grease collects in said chamber ; a clock-valve prevents the return of grease to the tank. Delivery from the storage chamber is effected by a pipe with a hand-controlled valve. The Specification as open to inspection under Sect. 91 comprises also a modified spring, which replaces the spring v shown in Fig. 4, when very thick greases are used ; it is shaped. like a spiral wrapping up the surface of a cone, its small end being connected to the piston and its large end bearing on the internal surface of the tank so that as the latter is raised the spring is distorted and whips the grease ; several such springs may be attached to a piston. This subject-matter does not appear in the Specification as accepted.