Patent GB-907755-A (GB)
Title: Polishing devices
IPC: B24B31/06
Filed: 1960-07-15
Abstract: 907,755. Vibratory polishing apparatus. PRODUCTIVE EQUIPMENT CORPORATION. July 15, 1960 [Feb. 9, 1960], No. 24711/60. Class 60. Polishing apparatus comprises mechanism for imparting vibrations to a non-tiltable frame 74, 76, Figs. 1 and 2, and a container 166 which is adapted to receive both the articles to be polished and the polishing medium and is supported in the frame for tiltable movement between charging and discharging positions. The frame 74, 76 comprises end members connected by an apron 78, Figs. 1 and 17, and box girder 80 and is supported from and between two pedestals 48 upstanding from a framed base structure 30, 34. A casing 54 adjustably mounted on each pedestal provides on its opposite sides vertical pivots 66 for torque arms 68 which are connected at their outer ends through flexible discs 70 with the respective end members 74, 76 of the frame. The vibrating mechanisms inside the two casings are connected by a shaft 58 driven by a motor 60 through variable-speed gearing, the rotation of the shaft 58 acting through a compoundeccentric arrangement to gyrate a tube 56 which surrounds the shaft and by its connection with the end walls 74, 76 of the frame therefore causes the latter to vibrate. The container 166 is of generally cylindrical shape and supported between the end members 74, 76 by providing on each of its heavy end walls an outwardlyprojecting sleeve 152, Figs. 7 and 8, which is disposed coaxially of the container and rests upon sets of rollers 102 or ball or roller bearings arranged in the upper arcuate face of a casting 86 carried by a member 82 from the respective end member 74 or 76 of the frame; each end wall of the container comprises a plate 168, Fig. 8, welded to a heavy plate 164 screwed in a circular recess 162 on the inner side of a casting 150 from which the sleeve 152 projects. Except when it is being tilted between its charging and discharging positions, the container is held rigidly in the frame by a pivoted clamp 108, Figs. 2 and 7, associated with each casting 150 and capable of being forced down so that a brake lining 110 on its inner arcuate face tightly engages the upper half surface of each sleeve 152; for this purpose, a latch 120, Fig. 2, pivoted to each casting 86 is so constructed that, when swung into operating position, a rounded projection carried by it can be forced into clamping engagement with a hook on the free end of the clamp. The container is tilted, after release of the clamps, by the use of a removable crank arm 194, Fig. 2, which carries a pinion for engaging a rack segment 192 on one end wall of the container and is only inserted into operative position when it is actually desired to tilt the container; for effective tilting control, one clamp 108 is first released and the crank arm 194 is then inserted and operated while maintaining a controlled braking force by the other clamp through suitable manipulation of its latch. The container, which is provided with a yieldable lining 182, Fig. 17, is provided along one side with a charging and discharging opening adapted to be closed by either an imperforate cover 232, Fig. 2, or perforated cover 256, Fig. 17 ; each of these covers carries members co-operating with the flanged surrounds of the opening to enable the cover to be tightly clamped by hand levers 249 against turned-over portions of the lining. While the imperforate cover 232 is only used when there is danger of the contents of the container splashing through the opening, the perforated cover 256 is only fitted, after a vibrating operation in which a de-scaling or de-greasing compound is used with the articles and polishing medium; with the cover so fitted and the container tilted from its charging and vibrating position, Fig. 2, to the position shown in Fig. 17, the compound passes through the cover leaving the articles and polishing medium in the container, the separating action being facilitated by injecting sprays of pressurized water into the container from a pipe 268 on the outside of the cover and, if desired, simultaneously vibrating the container. After the final polishing action which occurs with the container in its initial position, a screen 206 is fixedly supported between the frame members 74, 76, the container is tilted to the discharge position shown in Fig. 17 (no cover then being applied), and the vibrating mechanism is actuated so that all the material is discharged from the vibrating container on to the vibrating screen which passes the polishing medium to an underlying box 228 and causes the polished articles to pass down to a box 230. The casing portions 54 of the vibrating mechanism rest in arcuate seats in the pedestals 48 and can be secured in such adjusted positions as to set the inclination of the frame and screen to provide the desired rate of travel of the material along the screen. In a modified arrangement, the container is tilted by a pinion 382, Fig. 21, carried by the shaft of a motor 378 on a platform 374 arranged to be pivoted about an axis 372 to cause the pinion to be engaged with or disengaged from the rack segment 362 by a pneumatically-operated piston-and-cylinder device 400; the latches controlling the clamps 304, Fig. 20, are each operated by a pneumatically-operated piston- and cylinder device 328. A two-way solenoidoperated valve controlling the supply of compressed air to and from the cylinders 328, 400 is arranged in one position to release the clamps and engage the pinion with the rack segment and in the other position to reverse this operation. As long as either of two push-buttons in a control circuit is pressed the pinion is engaged and the clamps released, one push-button providing for the tilting of the container in one direction and the other in the reverse direction; only when neither push-button is pressed can the motor operating the vibrating mechanism be effective.