Patent GB-964564-A (GB)
Title: Lubricating apparatus and control valve
Inventor: FRIEDELL MORLEY VIRGIL
IPC: F16N7/34
Filed: 1962-07-27
Abstract: 964,564. Lubricating. C. A. NORGREN CO. July 27, 1962, No. 28879/62. Heading F2A. A lubricator, having a reservoir with an airspace above the lubricant, has means as described in Specification 889,089 for transferring lubricant from the reservoir to an outlet in a passage, which has an air inlet, an oil-laden airoutlet and a discharge valve therein. The valve has a valve member engageable with a valveseat in said passage, the valve-member being resiliently urged towards the seat to interrupt communication between said lubricant outlet and said discharge outlet, and means operable in response to air pressure in said space in excess of a predetermined value to move said valve member away from the valve seat. In an embodiment, a cash-register 10, Fig. 2, has a lubricator 12 therein which comprises a case 16, Fig. 4, containing an oil-filler 24, a pumping unit 26 and a control valve 25. The oil filler 24 has a tube 28 which extends from, and is integral with, a cover 17. The length of the tube 28 is predetermined so as to provide an air-lock which limits the supply of oil and thus maintains a minimum air-space 21 above the lubricant. The tube 28 is sealed by a plug 31. The pumping unit 26 has a body 34 integral with the cover 17 and a liner 35 therein receives a piston 36 having a bore 40 therein, one end of which communicates with the ambient air and the other end with an inlet valve comprising a member 42, ball 43 and sealing ring 44. A reduced opening 45 connects the inlet valve with a check valve, which comprises a ball 47 urged by a spring 48 against a seal 49. To ensure a liquid seal for the pump, a tubular extension 51 is screwably attached to the pump body 34 and extends into the lubricant in the reservoir. The control valve 25 has a pilot valve 52, a discharge flow valve 53 in communication with a dsicharge line 13 and an aerosol generator 54 which is integral with the valve 53. The pilot valve 52 has a body 55 bored to receive a piston 56 having a concave seat 57 engaging a ball 58; the piston is urged by a spring 63 towards a sealing ring 59 carried by the body 55. The bore of the pilot valve 52 is connected by a reduced bore 60 to the air space 21 and the spring 63 is retained by a threaded cap 64. The discharge valve 53 has a body 68 which is part of the housing, a first chamber 70, and a second chamber 72. The chambers 70, 72 are separated by a member 74 which is bored at 75, has an annular portion 74<SP>1</SP> to clamp a diaphragm 85 against the valve body 68, and has a rim 76 engageable by a flange 80 of a piston 78. The piston 78 has an extension 78<SP>1</SP> on which the diaphragm 85 and a plate 84 is mounted, a shoulder 83 abutted by said plate 84, an extension received by a bore 89 in a wall 71 of the chamber 72, and is urged by a spring 91 so that a seating-ring 81 attached to the flange 80 engages the rim 76 of the body 68. In operation, a crank 98, Fig. 2, of the cash register, is connected by a link 99 with the piston 36 of the pumping unit 26 and air is compressed in the space 21. At a predetermined pressure, the ball 58 and the piston 56 are forced upwards as shown in Fig. 6, and pressurized air passes through an aperture 79, Fig. 5, and into the chamber 70, moving the piston 78 against the spring 91 so that the flange 80 disengages the rim 76. The pressurized air passes from the chamber 70 into the chamber 72 via bores 82 in the piston. Pressurized air also enters chamber 72 past valve 80 from a vent 93 in the wall 71. Oil is supplied to the second chamber 72 through a tube 94 and the aerosol produced is passed to the discharge-line 13 via the bore 75, bores 88 in the member 74, an annular groove 87 in said member 74 and the discharge passage 73. When the pressure becomes reduced in the space 21, the ball 58 and piston 56 fall downwards, the passage of air through aperture 60 is prevented, and the piston 78 is moved by the spring 91 so that the passage 75 is closed.