Patent GB-593472-A (GB)
Title: Improvements in and relating to lathes and like machine tools
IPC: B23B3/18
Filed: 1944-09-26
Abstract: 593,472. Lathes. WARNER & SWASEY CO. Sept. 26, 1944, No. 18387. Convention date, Nov. 11, 1943. [Class 83 (iii)] Indexing mechanism for the indexible member of a lathe or like machine tool is of the kind comprising locating and locking means adapted to co-operate with a plurality of spaced abutment portions on the indexible member to locate and lock it in an indexed position and is characterized in that said locating and locking means are movable transversely of each other and are adapted to co-operate respectively with the opposite ends of the same abutment portion. The indexible member in the embodiment particularly described is a turret 33, Fig. 3, and is provided with a depending hollow boss 35 which is rotatably carried in a turret slide 32 and is secured against vertical movement by a nut or disc 36. An annular groove 37 is provided on the underside of the turret and in the turret slide to take a ring 39 which is bolted to or may be integral with the base of the turret. This ring is provided with equally spaced slots 41, Fig. 4, thus producing equally spaced segmental portions 42, which have stop faces at their opposite ends for locating and locking the turret. A spring pressed plunger 54, Fig. 4, located in the turret slides has a stop member 53 held to it by a spring and capable of limited transverse movement relative to the plunger. This stop member is adapted to engage between the face of an adjustable stopbolt 52 and an abutment face of one of the segments 42 in the ring carried by the turret. The other abutment face of the segment is engaged, in the locked portion of the turret by a plunger 63 which is rigidly connected through an adjustable sleeve 61. to a toggle mechanism 69, 71. The toggle is operated to release the turret by a projection 76 in the end of a slidable rod 51 which is moved by rack and pinion gears from a rod 47 and handle 43 carried by the turret slide. The handle 43 is moved from the full line position, Fig. 6, to the dash line position A for release of the turret and to permit indexing in the clockwise direction, Fig. 4 ; in this position a spring-pressed plunger 43a engages a notch 47a in the operating rod 47. If it is desired to rotate the turret freely in either direction then the handle 43 is turned further, into the position B, Fig. 6. The rod 51 has a reduced and bevelled portion 60 at the end opposite the toggle mechanism, which serves to lift the plunger 54 and thus retract the stop block 53 from engagement with the recesses 41, A projection 79 on the rod 51 is brought into engagement with another toggle member 81, Figs. 3 and 12, which operates a pair of clamping segments 85, 86 to hold the turret in its indexed position. The rod 51 additionally controls a lever 95, Fig. 4, through a cam surface 92 and follower 93 to open and close a valve for supplying coolant to the indexed tool station, or, when the turret is being indexed, to cut off this supply and return the coolant directly to the sump. The supply of coolant from the valve to the turret is through a pipe 104, Fig. 3, to a stationary standpipe 106 located on the axis of the turret, and coolant supply is directed to the operative tool station through one of a series of radial passages 111. The coolant connections may be made to one of a number of positions 112, 114, 116, whichever is the most convenient ; the one on the top of the turret is shown in Fig. 24, and a flexible connecting pipe 127 is shown directing coolant to the tool. The cam follower 93 may also be hand actuated by a rod 100 brought to the front of the turret slide, to cut off the supply of coolant to the tool when it is desired to examine the latter or the work.