Patent GB-166377-A (GB)
Title: Improvements in radial drilling machines
IPC: B23B39/12
Filed: 1920-04-28
Abstract: 166,377. Herbert, Sir A., and Vernon, P. V. April 28, 1920. Drilling-machines. - In a radial-arm drilling-machine, an electric motor, mounted on an extension of the arm beyond the pillar, drives the drill spindle through a transmission shaft, and operates the means for raising and lowering the arm on the pillar, and may also operate the saddle traverse and means for swinging the arm. The transmission shaft is reversible by reversing the motor, and the gearings for effecting the various operations are so interconnected with clamping means that the latter are automatically released before the gearings are connected to the transmission shaft. The transmission shaft E<2>, Fig. 4, driven by an electric motor (not shown) extends along the radial arm C, and can be connected by means of a clutch B<8> with a worm-wheel B<6> driving a worm on a nut B<4>, which travels on a screw B<2> carried by the pillar. The clutch B<8> is operated, through levers B<9>, B" and a rack B<12>, by a pinion on a spindle F' carrying a hand-lever F<8>. The spindle F' also drives, through worm gearing, two spindles F<2>, carrying eccentrics which engage the slotted ends of bolts F, which clamp the arm on the pillar. As shown in Figs. 3 and 6, the traverse of the saddle D is effected by a pinion G" on a shaft G<10> gearing with a rack G<12>. The spindle G<10> can be rotated by a hand-wheel G<15>, or by gearing from the transmission shaft E<2>. The latter drives, through worm gearing, a shaft G<4> carrying a worm which gears with a wheel G<6> on a vertical shaft G<7>. The latter drives a wheel G<9>, loose on the shaft G<10>, but capable of being engaged with it by a clutch G<13>, formed with rack teeth engaging a pinion G<16>, which engages upper rack teeth on a bar G<17>, lower teeth on which engage a pinion on a spindle G<18>, turned by a hand-lever G". The bar G<17> also carries teeth engaging a pinion on a spindle G<21>, an eccentric G<22> on which operates the saddle clamp G<23>. A worm on the spindle G<4> also drives a wheel H<3> on a spindle H, which drives a wheel H<5>, loose on a sleeve H<7>, mounted loosely on the spindle G<10>, and carrying a gearwheel H‹. The wheel H<5> can be geared to the wheel H<6> by a clutch H<9>, having rack teeth engaging a pinion H<24> on a vertical shaft H<23>, the lower end of which is formed with teeth gearing with teeth on a sliding rod H<22>, operated by a handle H<19> which turns a pinion H<21>. On engagement of the clutch H<9>, the wheel H<6> drives a spindle H<10> through gear wheels H<12>, H". The spindle H<10> carries a bevel-wheel H<13> driving a bevel-wheel H<14> sliding on a spline on a spindle H<15>. The latter drives, through worm gearing, a vertical shaft H<18>, Fig. 5, mounted on the revolving pillar B, and carrying a pinion J gearing with a toothed wheel J<2> on the fixed support of the pillar B. The bolt H<32>, which clamps the pillar B on its support, is simultaneously operated, being formed with a slotted head engaging a cam H<31> on a shaft H<30>, driven through worm gearing by a shaft H<27>, Fig. 3. A pinion on the latter gears with the toothed rod H<22>, Fig. 6.