Patent GB-190215005-A (GB)
Title: Improved Method of Bevelling Glass and Apparatus Employed therein.
Inventor: GOEHRING CHARLES LEWIS
Filed: 1902-07-05
Granted: 1903-05-14
Abstract: 15,005. Goehring, C. L., and Clause, W. L. July 5. Bevelling; surfacing glass. A machine for grinding glass, particularly for grinding flat bevels as distinguished from concave bevels on the edges of glass plates, may have the work or the stone fed in an inclined direction, or may have both fed in intersecting directions to give the desired bevel. In the machine shown in Fig. 1 the stone or grinder 22, which is long enough to grind the whole edge of the plate, is mounted in overhanging arms on the frame 5 and driven by chain and sprocket gearing from a pulley shaft 25, an a x i a l reciprocation being imparted to it by an arm 28 rocked by a crank-pin 29 on a vertical shaft 31 driven from the pulley shaft. The work support comprises a table 2, vertically adjustable by screws and bevel gearing operated by a hand - wheel 10, the table having inclined ways 1 for a slide 11 reciprocated by a connecting-rod 32 and eccentric 34 on a back shaft 36. A screw connection 35 is provided between the slide and connecting- rod, so that the position of the slide may be adjusted by hand. The slide is provided with a cross-slide 13, on which a work-holder 14 is pivoted at one edge and tilted by a screw 16 with a hand-wheel 17. The work-holder can also be tilted in a direction at right-angles by raising one pivot by an eccentric operated by a hand-wheel 99 to compensate for irregularities in the glass or alignment of the table. The work-holder is provided with a bridge on which is pivoted a clamping-plate 18 operated by a screw 21, and a pan 221, containing sufficient water to cover the grinding- line. The back-shaft 36 may be rotated in opposite directions by spur-wheels, loose on the shaft, but capable of being separately clutched to it by friction clutches controlled by a handle 53, each clutch being provided with a stop-motion which throws it out when the back-shaft has made a half revolution. One spur-wheel is driven by a train of wheels from the shaft 25 for reversing the shaft 36, while the other is driven by a variable speed gear to effect the forward or cutting traverse. The variable speed gear is driven from the shaft 25, and includes a pair of friction discs 65, 66, the disc 65 being moved across the face of the disc 66 by an adjustable crank 75 on a shaft 72 driven from the back-shaft. A transverse reciprocation is given to the slide 13 by a screw 80 operated through a crown reversing-train by a side shaft driven from the shaft 25, suitable sets of stops being provided to operate the reversing-clutch for both the long and short edges of the plate. In another form of machine. the grinder is carried by a rocking frame which is gradually raised, while the bearings of the grinder shaft are moved along the frame. The movement of the bearings is produced by adjustable-throw cranks, and that of the frame by adjustable-throw eccentrics, the throws being set to give the required bevel. The grinder and its shaft are axially reciprocated by a cam-groove on the shaft engaging stationary rollers. In the machine shown in Fig. 13, either the work or the grinder may be given a movement in the plane of the bevel, or the grinder may be given one movement and the work another movement, the combination producing a feed movement at the required angle. The table 139, which can be adjusted vertically by a hand-wheel 204, has upper and lower tables which can be adjusted to or from the stone, and a middle table 143 adjustable at right-angles (transversely) to the others. A rotatable work-support 156, with a water pan 158, is carried by the upper table. The grinder 159 is carried by a rocking frame 160 pivoted on the main shaft 161. The frame may be manually raised or lowered by a cable 162 and winch 165. The grinder shaft has an axial reciprocating movement in its bearings imparted to it by cams 171 on it engaging fixed pins, and the bearings have a sliding movement to and from the main shaft imparted to them by the links 249 and lever 178 operated by an adjustable-throw eccentric on a back-shaft 175 driven by gearing 248 from the main shaft. A pair of adjustable-throw eccentrics on the shaft 175 impart a periodic vertical movement to the stone frame, the eccentrics being adjustable to give the desired bevel. The automatic movement of the work to and from the stone is effected by a shaft 189, driven through shafts 191, 190 from the shaft 175, and having an adjustable crank connected to the nut with which engages the screw 145 for operating the lower table 142. The shaft 190 can also be geared to the shaft 195 carrying the hand-wheel 204, to impart a vertical power feed to the work. The shaft 195 can be moved axially to clutch it to a variablespeed gear similar to that shown in Fig. 1, and driven from the main shaft through a shaft 215. A stop-motion is provided to throw out the speed gear when the shaft 195 has made part of a revolution. When the shaft 195 is disconnected, the table 139 may be vertically adjusted by a handwheel 233. The table 143 can be reciprocated transversely by a screw 148, driven by a reversing- train 150, side shaft 1501, and countershaft from the main shaft. Stops and a controlling-rod are provided to determine the length of travel of the table. The stone may be trued by a diamond or cutting tool carried by a slide traversed by a screw along a frame secured to the stone frame, the screw being operated by open and crossed belts from pulleys on the main shaft and capable of being separately clutched thereto.