Patent GB-685975-A (GB)
Title: Universal boring machine
IPC: B23Q16/00
Filed: 1951-02-20
Abstract: 685,975. Drilling and boring machines. OFFICINE MECCANICHE CERUTI SOC. ANON. Feb. 20, 1951 [Oct. 12, 1950], No. 4108/51. Class 83 (iii). [Also in Group XXIV] A universal boring machine comprises a clutch 21v, Fig. 3, for connecting a guidescrew 12v of a vertical slide or a cross slide to conventional feed means, a second clutch 19v for connecting the screw through differential gearing 17v to an electric motor 14v for rapid movements and a hydraulic motor 15v for feed movements, means 83, 86 for preventing the simultaneous operation of the clutches, and a drum 38v, Fig. 6, carrying cams 39, 41, co-operating with members 29, 30, 31 projecting from the slide. The boring machine comprises a saddle 2, Fig. 1, carrying a cross-slide 3 traversed by a screw 12t, Fig. 4, and a column 5 carrying a vertically-adjustable slide 6 on which is mounted an axially-fed spindle 7 and which is raised or lowered by the screw 12v, Fig. 3. A back-rest 10 is adjustable on a column 9 synchronously with the slide 6. The machine-slides may be moved by conventional feed means including a main motor driving the screws 12t and 12v through gears 13v, 13t, engaged by clutches 21v, 21t. Alternatively, the clutch 19v may be engaged and the slide 6 driven through the differential gearing 17v either at a fast forward or reverse speed by the self-braking electric motor 14v or at a slow feed speed by the hydraulic motor 15v, driving through worm gearing 81, 82. The clutches 19v, 21v are actuated by hand-levers in such a way that the alternative drives cannot be engaged simultaneously. A dial 26v indicates the extent of movement of the slide. The screw 12t is driven in a similar manner. The hydraulic motors for each slide are controlled through hydraulic valves actuated by electromagnets. Parallel with each screw 12t, 12v is a camdrum. The drum 38v, Fig. 8a, for the slide 6 only will be described. The drum has a number of grooves and is associated with a clutch 47v having the' same number of teeth as the drum has grooves. The clutch carries a pin 49v engageable in a fixed member 50v so that by manipulation of a knob 51v the drum may either be rotated by cam gearing 56v, 45v, or released so that it may be rotated by a hand wheel 44v, or locked in a zero position. The drum carries a number of adjustable stops 39, 41, Fig. 6, the latter being composed of two parts 41, 42 which may be relatively adjusted by a micrometer screw 43. The stops 41, 42 are set by means of gauge blocks 66, Fig. 13, or a vernier device 68, and a dial indicator 70. The slides are locked by toggles, such as 33t, Fig. 14, and levers 34t<SP>1</SP>, 34t<SP>2</SP>, operated by a twoway piston 32t which is controlled by an electro-magnetically actuated valve. A visual indicator 37t indicates whether or not a slide is locked. The number of teeth on the camgear members 45v is equal to, or a multiple of, the number of divisions on the drum. The member 56v which rotates the drum is represented in developed form in Fig. 11b. Both cams 56v and 56t can be rotated by a hand wheel 54, Fig. 9, which carries three spring-loaded push-buttons so that it may be set in three positions A, B, C spaced at 90 degrees. The wheel 54 rotates a shaft 55 carrying four switch-operating cams 60-63 for each slide (only one set being shown). The cam 60 causes unlocking of the slide 6, say, as the wheel 54, and hence the gear 56v, is moved from A to C and the cam 61 causes the motor 14v to withdraw the slide. The circuit for the latter movement contains a switch such as 36t, Fig. 14, which is actuated only when the slide is unlocked. As the wheel 54 moves from C to B the drum 38v is advanced one step and the slide is moved first by the motor 14, then by the motor 15v when a lever 30 has been actuated by a stop 41. Movement of the slide is stopped when a lever 29 contacts the stop 41. Rotation of the hand-wheel from B to A then relocks the slide for drilling to be performed. In the position A, all the circuits are open and the machine can be controlled by push-buttons. The work-piece is positioned by the plane surface of the table 4, Fig. 1a, and a reference bar 11 thereon. The procedure for drilling a series of holes, whether any are aligned or not, is described.