Patent GB-648759-A (GB)
Title: Improvements in liquid or lubricant distribution systems
IPC: F16N29/04
Filed: 1947-04-29
Abstract: 648,759. Reciprocating lubricating pumps. TECALEMIT. Ltd., and LE CLAIR, C. C. S. April 29, 1947, No. 11498. [Class 102(i)] [Also in Group XXXIV] In a lubricating system, a plurality of injectors connected in series, supply lubricant to a plurality of points to be lubricated. Each injector comprises a hollow cylinder 1 to one end of which is fitted a pump body 2 in which an injector plunger 3 is slidable. The plunger 3 is attached to an air operator piston 6 disposed in the cylinder 1. A grease inlet port 4, adapted to be opened by movement of the plunger 3 towards the left, is connected by passage 64, Fig. 5, to a longitudinal passage 53, which is connected in series with other injectors and a source of grease supply by flexible hose 59, Fig. 8. Delivery of grease from the pump body 2 is made through discharge passage 17 past a valve 12 through passages 17a, 17b, 17c and 8 to an outlet connection 9 which is connected to the point to be lubricated. A grease nipple 20 in communication with discharge passage 8 is provided for grease gun supply in the event of failure of the injector. The valve 12 comprises a piston 13 provided with a sealing ring 300 and is normally urged upon its seat 16 by a spring 15. When the pump is being charged, the valve 12 is prevented from opening by the introduction of grease under pressure through passages 65, 65A to the space 66 above the valve piston 13. The lift of the piston valve 13 is variable by the insertion of detachable washers 18, thus constituting a method of adjusting the quantity of grease discharged. The piston 6 is urged to the left by a coil spring 7 and a sliding buffer 21 loaded by a spring 302 is arranged on an extension 301 of the injector plunger 3. A longitudinal passage 52 is connected by flexible hose 59 to the source of air supply and is also connected by passages 60, 61, 62 to the space 63 between the piston 6 and the cover 24. A single phase electric motor 70 drives a compressor 69 which supplies a container 67 connected to main air duct 68 and main air line 68a, for operating the pistons 6 of all the injector devices. A pressure operated switch 73 in the air duct 68 is connected to the motor starter 74 and ensures a minimum pressure of say 25 lb./in.<SP>2</SP> in the container 67. The air supply to the main air line is controlled by a solenoid actuated main air valve 75 in which either the air duct 68 or exhaust connection 90 may be put in communication with the main air line 68a. A relief valve 72 is provided on the container 67. A main grease pump 71 also driven by the motor 70 draws grease from a reservoir 91 and delivers it under pressure to a main grease line 92. A relief valve is incorporated in grease line 92 and comprises a plunger 94 secured to a spring urged piston 96 the plunger being slidable in a bore 95 and arranged to normally cover a port 95A connected by a pipe 99 to the grease container 91. An air inlet port 100 is formed beneath the piston 96 and is connected to the main air line 68a. The pressure in the main grease line 92 is relieved whenever it exceeds a predetermined value (400 lb./in.<SP>2</SP>) or when the working pressure exists in main air line 68a. In a modification the valve 12 is held closed during the charge stroke by electromagnetic means. In a further modification. Figs. 15, 16, (not shown), the piston 7 is dispensed with, and the piston 6 and plunger 3 returned by grease pressure only, the latter being supplied through an inlet valve 250. Fault detecting means are disposed in a housing 30 on each injector. Specifications 615,746, [Group XXXIV], and 630,679 are referred to.