Patent GB-953306-A (GB)
Title: Improvements in or relating to automatic lubricating devices
IPC: F01M1/12
Filed: 1962-11-07
Abstract: 953,306. Lubricators. G. DUSTERLOH FABRIK FUR BERGWERKSBEDARF G.m.b.H. Nov. 7, 1962 [Nov. 7, 1961], No. 42148/62. Heading F2A. In an automatic lubricating device for compressed air operable starters, a metered quantity of lubricant is forced into the air-flow each time the starter is operated. In an embodiment, the device comprises a valve-housing 1 having an air entrance chamber 1a which receives compressed air used for starting a rotor (not shown) of a starter, the compressed air being supplied by a supply line (not shown). The chamber 1a is closed by a valve cone 2 which is urged against its seat 1b by the pressure in the chamber 1a. The valve cone 2 is mounted at one end of a hollow spindle 3, the other end of which carries a piston 4 thereon. A chamber 5 is formed between the piston 4 and a wall 13 of a reservoir 14 and is connected by a bore 36 to a cylinder of a valve 6. The oil in the reservoir 14 is pressurized by a piston 19 being urged by a spring 20 and is forced along a supply pipe 12 caused by a sleeve 15 which, having external screwthreads thereon, is screwed into the spindle 3. The oil passes from the pipe 12 and through transverse bores 18 thereof, into an annular chamber 17 formed between the spindle 3 and the pipe 12. When operating the starter, a control valve 32 is opened so as to supply compressed air from the chamber 1a to a chamber 35 of the valve 6 which is moved to the left of the drawing so as to allow a chamber 37 to communicate, via the bore 36, with the chamber 5 of the piston 4, compressed air being supplied to the chamber 37 by pipes 33, 38 connected to the chamber 1a. The pressure differential between the effective areas of the piston 4 and a nut 26, which is screwably secured to an end 27 of the spindle 3, allows the piston 4 to move to the right against the action of a spring 30, the sleeve 15 closes the transverse bores 18 in the pipe 12; and the bores 10 connect with the chamber la so as to allow compressed air to pass therefrom, through bores 28, 10<SP>1</SP> in the spindle 3, and into a passage 11 leading to the rotor of the starter. Further movement of the piston 4 to the right causes a shoulder 7, of the spindle 3, to engage a washer 9 abutting the valve-cone 2 which is then moved away from its seating 1b During the movement of the sleeve 15 to the right, the oil in the annular chamber 17 is compressed until sufficient pressure is obtained to open a non- return valve 16, located at the delivery end of the pipe 12, and thus allow lubricant to be forced into the passage 11. After the starting operation has been completed, the control valve 32 is closed and the valve 6 is closed by the spring 29 thus cutting-off the supply of compressed air to the chamber 5, which is now connected to an exhaust vent 39, via a chamber 40. The piston 4 is returned by the spring 30, thus causing a suction to be effected in the annular chamber 17 which causes oil to be drawn from the pipe 12, via the bores 18; the valve cone 2 returns to its seat 1b and the device is ready for the next starting operation.