Patent GB-637466-A (GB)
Title: Lubrication
IPC: B23Q11/12
Filed: 1947-08-08
Abstract: 637,466. Lubricating. AUTO RESEARCH CORPORATION. Aug. 8, 1947, No. 21872. Convention date, Aug. 3, 1940. [Class 12 (iii)] [Also in Group XXVIII] In a machine tool having a central reservoir for lubricant, a central pump, a branched conduit system conducting lubricant from the pump to the bearings and flow metering devices in the system to distribute the lubricant in proper proportions among the bearings, a plurality of interior bores are provided serving as part of the branched conduit system and the bores are blocked by flow metering devices. Applied to a lathe, the bottom of the apron of the lathe has walls 50, 51 to which is connected a pocket member 23 having a wall 55 on which is mounted a pump 57. The pump comprises a reciprocating unpacked plunger 60, inlet check valve 59, inlet. strainer 58 and outlet check valve 61. The pump is actuated from the shifter lever rod 71 by means of a clevis member 75 on the rod 71 which engages the plunger rod 67, discharge being on the return stroke which is effected by a spring 70. A tube 75 is connected between the outlet valve 61 and a junction 76 having two restricted outlets 79, 80 and two unrestricted outlets 81, 82. The restricted outlets 79, 80 are formed by flow metering fittings of the type shown in Fig. 13 comprising a body 83 having a bore 84 substantially fully restricted by a pin 85. An inlet strainer 86 and outlet spring valve 88 are incorporated. Tubes 91, 92 lead lubricant from the restricted outlets to gear trains through drip portions 93, 94. The unrestricted tubing connections 98, 99 are connected by elbow adapters 100, 101 to the bore systems within the upper portion of the carriage of the lathe. As shown in Fig. 5, the elbow adapter 100 communicates with a transverse bore 104 which in turn communicates with bore 105 in the upper portion of the carriage structure, a lubricant-tight seal being made by the washer 106. Bore 105 communicates with a passage 113 containing a flow restriction pin 115 which feeds a transverse bore 140 in the carriage 12 and a socket 116 containing a flow metering fitting 119 which communicates with a drip feed pipe 130 for a gear train. Flow metering fitting 119, Fig. 11, comprises a bore 121 substantially completely filled by a pin 123, an inlet strainer 125, an outlet check valve 126 and an enlarged screw-threaded head portion for screwing into the socket 116. The transverse bore 140 feeds bores 149, 150, Fig. 3, containing flow metering fittings 146, 147 which are of similar construction to the fitting 119 shown in Fig. 11, except that the enlarged threaded portion is provided at the inlet strainer end. The bore 149 has capillary openings 151, which feed lubricant to both sides of the way 11, whilst bore 150 feeds lubricant through a vertical bore 154, Fig. 8, to grooves 155, thus lubricating the bearing surface 156 of the crossslide. Lubricant is also fed through a tube 157 to a groove 158 formed in the upper face 159 of the cross-slide 14. An overflow tube 160 feeds lubricant from the groove 158 to a recess 162 for lubrication of the bearing surfaces 175, 156. Similar overflow tubes 166, 167 feed lubricant to a feed screw bearing and bearing surfaces 172, 173 respectively. A similar arrangement is provided for feeding lubricant from the elbow member 101.