Patent GB-378441-A (GB)
Title: High pressure lubricating systems
IPC: F16N5/00
Filed: 1931-05-06
Abstract: 378,441. Force-feed lubricating ; pipe couplings. BARKER, G. G., 59, Chancery Lane, London.-(Bendix Aviation Corporation ; 105, West Adams Street, Chicago, U.S.A.) May 6, 1931, No. 13389. [Class 12 (iii).] In a portable lubricating apparatus, the admission of lubricant at low pressure into a high-pressure pump effects the clamping of the nozzle of the pump to a nipple on mechanism to be lubricated, and the pressure in the pump during discharge effects further tightening of the clamping members. Lubricant is supplied to the high-pressure pump by a low-pressure pump 31, Fig. 1, through a hose 29, the pump 31 being mounted on a truck 21 and drawing lubricant from a container 20 through an axially-movable pipe 24 which carries a plate 23 resting on the lubricant and which is connected to the pump inlet by articulated pipes 25. The pump 31 comprises a rotor 35, Fig. 2, with spring-pressed vanes 37, coupled to a similar rotor 34 driven. by compressed air entering through an inlet 38. The compressed air is supplied to the inlet 38 and to a hose 28 leading to the high-pressure pump from a hose 26 under the control of a three-way cock 40. The high-pressure pump comprises a tubular body 50 connected by a pipe 51 to the hose 29 and having a cylindrical nozzle part 90, Fig. 4, communicating with the interior of the body 50 through a slot 52. A plunger 55 arranged within a sleeve valve 58 mounted to slide and rotate within the nozzle is formed with a projection 56 at its end engaging a slot 57 in the valve 58. The plunger 55 is secured to a piston 63 arranged within a cylinder 61 secured to the sleeve valve 58. The outer head 67 of the cylinder 61 has a projecting handle 71, whereby the cylinder can be turned about its axis, and is provided with ports D, E communicating with the outer and inner ends of the cylinder respectively and adapted to cooperate with ports A, B, C, Fig. 6, in a plate 68 held against the head 67 by a pivot pin 77. The port A is connected to the air hose 28 by a pipe 81. A pair of levers 75 pivoted at their ends to the plate 68 and body 50 respectively are connected at an intermediate point to rods 84, Figs. 4 and 9, connected to a ring 87 loosely encircling and bearing against a shoulder 88 on a sleeve 89 rotatably and slidably mounted on the end of the nozzle 90. The lower ends of the levers 75 act as stops to limit the movements of the handle 71. A U-shaped slot 91, Figs. 4 and 9, is provided in the ends of the sleeve 89 for receiving the spherical head of a lubricating nipple 98 containing a spring-pressed ball valve closing the inlet aperture, which may be arranged in any position on the head. In operation, the pump 31 maintains a constant pressure in the hose 29. With the handle 71 in the extreme position indicated by the line 10, Fig. 6, in which position the ports A, E and C, D are in register and the slots 52, 57 are out of register, as shown in Fig. 17, the slot 91 is engaged over a nipple 98 and an apertured sealing disc 95 in the end of the nozzle is pressed against the nipple. The handle 71 is then turned into mid-position, bringing all the air ports out of register but bringing the slots 52, 57 into register. Low pressure lubricant thus enters into the nozzle chamber 54 and forces back the sleeve 68, as shown in Fig. 19, whereby the levers 75 act through the rods 84 and discs 87 to move the sleeve 89 and clamp the nipple 98 against the disc 95. The handle is now turned into the other extreme position represented by the line 12, Fig. 6, in which the slots 52, 57 are out of register and the ports A, D and B, E are in register, and the plunger 55 is thereby moved to discharge lubricant under high pressure into the nipple. The handle 71 is then again moved into the position 10, when the air pressure acts to retract the plunger 55 and a spring 96 acts to separate the members 89, 95 so as to release the nipple.