Patent GB-190215004-A (GB)
Title: Improvements in or relating to Glass Grinding and Bevelling Apparatus.
Inventor: GOEHRING CHARLES LEWIS
Filed: 1902-07-05
Granted: 1903-03-12
Abstract: 15,004. Goehring, C. L., and Clause, W. L. July 5. Bevelling; surfacing glass. A machine for grinding or bevelliog glass plates has a grinding- wheel F mounted in a swinging frame E pivoted on a shaft E<1> mounted in a bracket D, the frame being locked in any desired position, while the work B<9> is fed vertically against it at a gradually decreasing speed till the feed is stopped, after which pumicestone in the form of paste is applied to the wheel to impart a better finish to the ground surface. The shaft F<1> of the grinding- wheel is reciprocated axially during grinding, the work being reciprocated in a parallel direction, the width of the stone being sufficient to cover the whole of the surface operated upon in all positions. The shaft E<1> has fast and loose pulleys E<2> for driving the machine, and drives the shaft F<1> by chain and sprocket gearing. A side shaft F' on the frame, driven from the shaft El, has a crankpin at its front end to reciprocate the shaft F' and grinding-wheel. The bracket D is adjustable on a bracket A<2> on the framing A by a screw and handwheel d<1>. The downward movement of the frame E is limited by a screw G<1> on it engaging a bracket G on the framing A, and the frame is locked in this position by a roller H<4> on a rocking arm H<3> engaging above a bracket G<2> on the frame. The arm H<3> is mounted on a shaft g<2>, which also carries arms g<1> with rollers g engaging the underside of the bracket, and can be rocked by a counterweight H and link h, or by a handle H<2> and link H<1> to lock or unlock the frame and adjust it vertically. The bracket G<2> is vertically adjustable on the frame E by a screw H<6>. The work B<9> is clamped on a turntable B<8> passing water-tight through a pan I and carried by a compound slide B<4> on a bracket B. One member of the slide is reciprocated laterally by a lever Q during the grinding, while the other member is operated by a rack and pinion to withdraw the work from the wheel when the turntable is to be angularly adjusted. The turntable is locked by a spring bolt engaging notches in it, the bolt being retracted by hand and held by a spring catch till the table is partially rotated, when the catch is tripped by the table so that the bolt will enter the next notch. The bracket B is raised by a screw C, which may be operated through bevel gearing by a hand-wheel C<4> on a shaft C<3> to bring the work close to the grinder, after which the screw is operated by power at a diminishing rate to feed the work during grinding. The power feed is obtained bv moving the shaft C<3> axially by a handle C<6>, Fig. 2, to clutch it to a worm-wheel K driven by a worm shaft K<2>, which is driven by friction discs K<3>, L' from a shaft L driven by a belt l<1> from the shaft E'. The disc L<1> can be moved along its shaft, as the bracket B rises, by an arm M to diminish the feed gradually, the arm being rocked by an adjustable crank O<1>, Fig. 22, on a shaft O<2>, driven from the shaft C<3>, or by a rack M<3>, Fig. 2, on the bracket B engaging a pinion m on the boss of the arm, the arm being made telescopic, so that the diminution of feed may be varied. The disc K<3> is kept in contact with the disc L' by a flat spring P engaging between collars p<1> on the shaft K<2> and thrust forward by a pivoted dog P<3>, Fig. 22, with a set-screw P<4>, the dog being held by a spring catch P<6>. The dog is set by the movement of the shaft C<3> to engage the power feed, a collar P' on the shaft engaging an arm P<2> on the dog. When the work has been fed up sufficiently, a projection on a collar P<7>, angularly adjustable on the shaft C<3>, trips the catch P<6> and releases the dog, thus stopping the feed only. The grinding is continued till the wheel ceases to make contact with the work. The water in the pan I, which has been sufficient to cover the grinding-surface, is then drawn off, and the abrading-paste applied to the wheel to finish the surface. The lever Q for reciprocating the work is rocked by an adjustable crank q<1>, which can be adjusted while the machine is running by a handle-wheel q<8> on a shaft q<7> geared to a shaft q<4> passing through the shaft carrying the crank disc Q<4> and connected by bevel gearing to a screw q for adjusting the crank-pin. The disc Q<4> is driven by worm gearing from a shaft Q<6> driven from the shaft L. Parts of the apparatus may be used in apparatus such as is described in Specification No. 15,006, A.D. 1902, for grinding or bevelling round, oval, or other curved surfaces or edges.