Patent GB-761679-A (GB)
Title: Improvements in and relating to dispensers for lubricants
IPC: F16N25/02
Filed: 1954-03-24
Abstract: 761,679. Lubricating. SATZGER, E. March 24, 1954 [March 27, 1953], No. 8568/54 Class 12 (3). A dispenser for lubricant comprises a feed piston and a control piston which is connected to a supply line subjected to varying pressure, the control piston being held by a spring in one end position until the feed piston has completed a stroke for feeding one outlet, and being moved into the other end position when the pressure from the supply line has increased sufficiently, whereupon the feed piston returns to feed lubricant to a second outlet. The dispenser shown in Fig. 1 has a control piston 4 and a feed piston 5. Lubricant is supplied to a bore 6 for discharge to one or other of outlets 7, 8. In the position shown, lubricant flows through a passage 26 around a reduced portion of the control piston, and through a passage 11 to one end of the feed piston, whereby it is moved to the opposite end of the cylinder bore 3. Some lubricant also flows through passage 26, a cross bore 29 and passage 28 to one end of the control piston, but the pressure is at first insufficient to move the piston 4 against the pressure of the spring 18. The feed piston 5 forces lubricant out from the chamber 12 through passages 13, 25 and 15 to the outlet 8. Then the supply pressure increases sufficiently to move the control piston 4 to the right against the pressure of the spring 18. The lubricant from supply line 6 then flows through passage 26 and passage 13 to the chamber 12 causing the piston 5 to move to the left and expel lubricant through passages 11, 24 and 14 to outlet 7. The control piston 4 remains in its position until pressure is reduced in the supply line 6, whereupon the spring 18 returns the piston 4 to its initial position. The screw cap 17 surrounding the spring 18 has an air hole 21 which in a modification is dispensed with, a passage being provided between the interior of the screw cap and the passage 15 leading to the outlet 8. In the construction shown in Fig. 7, the feed piston 5 is mounted within a central bore of the control piston 31 which is guided in a bore 32. Lubricant from the supply line 6 flows through a passage 34 to a chamber 35 on the left of the control piston 31, and also flows through a duct 36, a groove 37 and a passage 38 to a chamber 39 at the right of the piston 5. The piston 5 is therefore moved to the left causing lubricant to flow out of chamber 44 through passages 49, 50 to the outlet 51. The outlet is connected by a passage 52 with the chamber 40 to provide pressure which aids the spring 41 in preventing the control piston from moving to the right until flow of lubricant from chamber 44 has ceased. The pressure in chamber 35 then overcomes the spring pressure so that the control piston is moved to the right. This allows connection of supply line 6 through passage 36, grooves 42 and passage 43 to the chamber at the left of the feed piston 5 whereby the piston is displaced to the right to expel lubricant from the chamber 39 to the outlet 48 by way of passages 45, 47. In the arrangement shown in Figs. 8 and 10 the feed piston 58 is provided with an eccentric pin 65 engaged in an annular groove 64 on the control piston 60 whereby the piston 58 is turned about its axis when the control piston is moved. In the position shown in Fig. 8 pressure in the supply line 61 is transmitted to one end of the control piston 60 and is also transmitted through passages 69, 70 and a groove 75 to a chamber 68 above the feed piston 58 which is then pressed downwardly causing lubricant to be expelled by way of groove 74 and passage 72 to outlet 63. A passage 73 from this outlet to chamber 76 provides pressure to aid spring 66 in resisting movement of the control piston 60 until the downward movement of piston 58 has ceased, whereupon piston 60 is moved to the position shown in Fig. 10 causing the piston 58 to turn about its axis and bring passage 69 into comniunication with groove 74. Pressure from the supply line 61 is then transmitted to the bottom of piston 58 which is forced upwardly and lubricant is expelled from chamber 68 through groove 75 and passage 71 to outlet 62.