Patent GB-190215006-A (GB)
Title: Improvements in or relating to Apparatus for Bevelling Plates, especially Glass and Equivalent Material.
Inventor: GOEHRING CHARLES LEWIS
Filed: 1902-07-05
Granted: 1903-02-12
Abstract: 15,006. Goehring, C. L., and Clause, W. L. July 5. Bevelling glass &c. A machine, especially a p p l i - cable for grinding elliptical or other curved glass plates, has the grindstone &c. F mounted in a frame E swinging on a shaft E<1>, from which the stone is driven by chain and sprocket gearing. The work is carried by a rotary head B', carrying a slide B<5> with a central stud on which the worksupport B<6> is mounted. The slide engages with an eccentric sliding on a table B<1> pivoted to a bracket B and carrying the rotary head, the eccentricity being adjustable by a screw b<4> to vary the shape of the ellipse produced, this mechanism being similar to that described in Specification No, 7136, A.D. 1889. The bracket B can be raised or lowered by a screw C. The head is driven by bevel gearing, a telescopic shaft S, and shaft H<9> from the shaft E', and can be tilted to any desired angle and locked by segments b. The stone may be raised out of contact with the work by a counterweight H connected to crank arms g<1>, pivoted on a bracket g<3> on the framing and engaging a bracket G<2> on the frame E, or by a handle H<2> linked to the arms. The downward movement of the stone and frame is limited by a screw G<3> engaging a stop G, and the frame is locked in this position by rollers H<4> on arms H<3> operated by the handle, the rollers engaging the upper side of the bracket G<2>. The screw C may be operated by a hand-wheel C<4> to bring the work into the cutting position, and is then operated at a diminishing rate by power to feed up the work during roughing and finishing. The power feed is obtained from a shaft C<3>, which can be moved longitudinally by hand to clutch it to a worm-wheel K driven by a worm shaft K<2>, which is driven by friction discs K<3>, L<1> from a shaft L driven by a belt l<1> from the shaft E<1>. The disc L' can be moved along its shaft L by an arm M to diminish the feed gradually, the arm M being rocked by an adjustable crank O<1> on a shaft 0' driven from the shaft C<3>. The disc K<3> is kept in contact with the disc L' by a flat spring P engaging between collars p<1> on the worm shaft and thrust forward by a pivoted dog P<3>, as described in Specification No. 15,004, A.D. 1902. When the desired amount of feed has been given to the work, a projection on the shaft C<3> trips the dog, and allows the friction discs to be disengaged to stop the feed. The dog is reset by the longitudinal movement of the shaft C<3>. To prevent the bevel altering in width due to the thickness of the stone and the elliptical shape of the work, the stone is given a reciprocating movement to and from the work, of the required amount and phase. This movement is obtained by cranks q of adjustable throw on a shaft driven from the shaft E', the cranks being connected by rods Q<1> to the sliding bearings of the grindstone shaft F<1>. Another mechanism, described in Specification No. 15,004, A.D. 1902, may be used to vary the feed by moving the disc L'.