Patent GB-1146629-A (GB)
Title: Polishing apparatus
IPC: B24C9/00
Filed: 1966-05-27
Abstract: 1,146,629. Blasting. A. H. EPPLER. 27 May, 1966 [10 June, 1965], No. 23865/66. Heading B3D. Polishing apparatus in which a liquid containing suspended abrasive is projected into contact with work to be polished includes (a) a housing forming a work treating chamber and having an opening in an inclined plane, (b) tracks provided on the housing which extend in substantially parallel relationship to the inclined plane, (c) a closure member engaged with the tracks to afford sliding movement of the closure member between a covering and an uncovering position relative to the opening, (d) a drip pan disposed on the housing to receive liquid drippings from the closure member when the closure member is in the uncovering position, and (e) means for assisting movement of the closure member from a closed position in which it covers said opening to an open position in which said opening is uncovered. A stand 12 supports a housing 14 forming a work treating chamber 16 and having an inclined opening 18. A hood 22 carries rollers 24 engaged with guideways 20 formed on the sides of the opening and on inclined extensions 30. The hood is connected by a rope and pulley arrangement 34 to a counterweight 32 located in a hollow leg 36 of the stand. The hood 22 has an observation window 38, arm holes 40 with protective covers 52 for manipulation of a nozzle 50 by the operator and lights 54; the window 38 and the protective glass 55 of the lights are washed by means 154. When the hood 22 is in the open position, the abrasive-containing liquid accumulated on the inside of the hood during use falls on to a drip pan 56 carried between the extensions 30 and is directed into the chamber 16. The hood has a forward rubber gasket 60 forming a seal between the hood, in its closed position, and the housing 14; the hood has a rearward rubber gasket 62 forming a seal between the hood and the drip pan 56. A foraminous work-table 72 journalled on the housing 14 is rotated continuously or intermittently by a rubber roller 78 engaging its periphery and driven by a motor 80. Abrasive-containing liquid drains through the work-table 72 during use into a sump 82 including a spherical bottom portion 84 and side walls 86, 88 providing a smooth transition between the portion 84 and inclined mounting members 90 (91) on the housing 14. The abrasive-containing liquid is drawn from the sump through a filter 104 by a pump 100 which delivers it through a stand pipe 106 and hose 108 to the nozzle 50. The pump also returns some of the liquid to the sump through a pipe (110) which lies along one of the sump side walls 88 and is directed towards the portion 84 to agitate the liquid in the sump to prevent settling out of abrasive. The nozzle 50 is also connected through an air hose 120 and stand pipe 122 with a pressure air supply, for delivering the abrasive-containing liquid from the nozzle. The housing 14 has an air inlet formed by a gap (12b) between the guideways 20 and the hood 22, the latter being formed with a perpendicular portion 128 beneath the guideways 20 whereby air entering the gap is directed generally along the sides of the housing. The housing 14 has an outlet 130 communicating, through a filter (136), with a fan 134; a baffle 140 is provided.