Patent GB-191202934-A (GB)
Title: Apparatus for Drilling, Punching or Stamping Constructional Metal Members and the like.
Inventor: KOLASSA ANTON
IPC: B21D28/24
Filed: 1912-02-05
Granted: 1913-01-30
Abstract: 2934. Kolassa, A. Feb. 5. Drilling - machines. - Apparatus of the type described in Specification 25,661/11 is modified by making the whole of the operations automatic. Automatic centring - bolts carried by the machine tool engage one of the previously - adjusted stops on the stop-bar, and, after the machine tool has operated, the tool is moved automatically to the next stop. The apparatus is described with reference to drilling. After the last hole has been drilled, the drilling - mechanism moves back to the initial position. The drill spindle 12, Figs. 1 and 3, is mounted on a slide 10 moving on a guideway 11 supported by guide-shoes 2 from a carriage d. There may be several slides 10 working between stops 62. The carriage d is traversed vertically by bevel-gearing e, f and a screw g. The drill spindle is rotated by gearing h driving a shaft k which operates the automatic devices, The shaft k transmits motion through gearing 4, 5, 8, 16 to the drill spindle. Where necessary throughout the apparatus, the gearing for transmitting motion is arranged to maintain engagement notwithstanding the motion of the carriage and slides. Belts 34, 33 transmit motion to a shaft 32 coupled by a universal joint to a shaft 31 carrying a worm 29, Fig. 11, gearing with a worm - wheel 28 on a shaft 27. The shaft 27 can also be turned by a hand-wheel 30, Fig. 1, and carries a pinion gearing with a rack on the drill spindle 17. The feed of the drill is stopped by the engagement of a spring- pressed rod 22 with a hook-ended bell-crank 36, which supports the end 37 of a lever 38 carrying the shaft 31. The withdrawal of the support allows the lever 38 to move under the action of a spring 39 and withdraw the worm 29 from engagement with its worm-wheel. The drill spindle is raised by the action of the spring 24 on the rod 22 after the worm 29 has been disengaged. The lever 38 is connected by a rod 40 to a rock - shaft 41, which carries a lever attached to a reciprocating rod 42. The upper end of the rod 42 is attached to a centring-bolt 43, Figs. 1, 7, and 9, provided with a tappet 47 sliding in a slot of a sleeve 46. The bolt 43 has an oval aperture for engaging the finger 45, on one of the spacing-stops q. The stops are adjusted on rails p mounted in bearings o, and there may be any number of rails which are detachable for adjusting the stops, if necessary. externally to the machine. The downward movement of the rod 42 moves downwards the centring-bolt 43, and the tappet 47 acts on a spring-pressed pawl 48, which by linkage 49, 50 moves a clutch member 51, which normally is in its central and disengaged position on the shaft k, into engagement with the gear-wheels 52. The wheel 52 transmits motion by gearing 54, 55, Fig. 1, to a shaft 57 and pinion 58, Fig. 3. The pinion acts on a rack 59 to traverse the drilling-mechanism. Projections 71, Fig. 7, on the stops q are engaged by a lever 69 as the drilling-mechanism is traversed to rotate a shaft 67. The lever 69 is only in position for this engagement after a tappet 63, moving downwards with the bolt 43, has operated a lever 64. The rotation of the shaft 67 rocks a lever 72, mounted on it, to operate through a spring 73 a lever 74, Figs. 7 and 9. The lever 74 thereby raises a shaft 76 to bring a worm 78 into engagement with a worm-wheel 82, the shaft being supported by a hook on a lever 85. The shaft 76 is coupled by a universal joint to a shaft driven by belt gearing from the shaft k, so that the worm-wheel sets in motion a pinion 83 to operate a rack 84 and raise the centring-bolt into operative position. At the end of the traverse of the bolt, a tappet 86 engages the lever 85, which withdraws its hook-shaped end from the shaft 76, and the worm 78 falls out of engagement. At the termination of the drilling-operation, a stop 62 on the rail p engages a lever 60 to move the clutch into engagement with the gear-wheel 53 and thereby bring back the drilling-mechanism to its initial position.