Patent GB-190311400-A (GB)
Title: Improvements in Fluid Pressure Indexing-mechanism for Operating Lathe Turret-heads, Chucks, Work-holders and the like
Inventor: HANSON BENGT MAGNUS WILHELM
Filed: 1903-05-19
Granted: 1903-08-20
Abstract: 11,400. Hanson, B. M. W. May 19. Lathes; chucks. - Relates to fluid - pressure means for actuating the turret-heads of lathes, the heads of milling - machines, and screwing, chucking, and other machines. Figs. 1 and 3 show the turret-head of a lathe, mounted on a slide 15, which is moved backwards and forwards on the bed 16, by any ordinary devices. At the forward end, the slide 15 is bifurcated as shown in Fig. 3, to allow long tools to be used. The two parts of the slide are tied together, by a U-piece 20. The turret - head is carried in trunnions 22, 23. The latter carries a sleeve 35, secured to the head by screws, and provided with notches 40, in which the pawl 41 can engage. This sleeve and other parts are enclosed in a boss 27, closed at one end by the bevelled end of the turret-head, and at the other by a cover 25, through which the journal 23 passes. On the outer end of this journal is secured, by a nut, a disc 30, which is prevented from rotating. The cover 25 forms one side wall, and a ring 37 the other side wall of an annular chamber, in which is a ring 45, provided with side wings 48. This ring and its wings can rotate in the annular chamber from one side of the abutments 50 to the other. Fluid under pressure is supplied by a pipe 76, Fig. 1, to a valve 78, which is pushed in one direction by a spring, and can be moved in the other by hand or automatically when the slide reaches the end of its backward stroke. The spindle of the valve then encounters a lever 81 which may be positioned by a cam on the driving- shaft 85. With the valve in the position shown in the diagram, Fig. 10, iluid passes through the passage 64, to a cylinder 60, and raises a locking- stop 43 to engage with a notch in the turrethead. Fluid also passes by the opening 33 into the space 32, and pushes out the disc 30 to hold the bevel on the head against its seat on the boss 27. When the valve 78 is pushed to the left the passage 64 is put in communication with the exhaust passage 89, and fluid is supplied by the tube 63 to the upper end of the cylinder 60, to withdraw the stop 43. The space 32 is at the same time exhausted, and the bevel released. Fluid also flows by the passage 69 to the left-hand side of the abutments 50, and, acting on the wings or pistons 48, rotates the ring 45. At the same time, fluid enters the cylinder 51 and pushes the tooth 41 into engagement with one of the notches in the sleeve, so that the turret-head rotates with the ring. As the head rotates a stop 70, hinged in a slot in a ring 71, strikes the piston-rod 73. The head is thus arrested slowly, and, as the area of the positioning cylinder is greater than that of the two wings 48, it is pushed back to the correct position. The slide then moves in the contrary direction, the valve 78 is moved into its original position, and the head is locked as described above. By suitably arranging the stops 70, any desired combination of tools can be brought into use.