Patent GB-844920-A (GB)
Title: Apparatus for use in manufacturing plastic faced building units
IPC: B24B7/12
Filed: 1959-03-11
Abstract: 844,920. Grinding. GITTINS, W. G. March 11, 1959, No. 8379/59. Class 60. Apparatus for use in manufacturing plastic faced building units comprises in combination a substantially rectangular framework ; an endless conveyer belt mechanism and means for activating the belt thereof supported in said framework ; a plurality of spaced cutter assemblies each individually supported from said framework ; a motor-driven stone cutter disc included in each assembly ; a manually operable mechanism associated with each cutter assembly for varying the disposition of said disc relatively to the conveyer belt ; finely adjustable means for stabilizing each cutter assembly in a plane of most effective operation ; guide means extending longitudinally thereof and suspended above the conveyer belt ; a plurality of manually operable mechanisms for maintaining said guide means in a selected disposition relatively to the cutter assemblies ; a pair of roller assemblies for applying lateral pressure to building units on the conveyer belt, a plurality of roller assemblies for applying downward pressure to said units ; a water reservoir rigid with said framework ; and a water pumping and spraying system supported on the framework for lubricating the discs of said cutter assemblies. The frame of the apparatus comprises, at the loading end, uprights 52, 52 connected by transverse bars 56, 60, and at the delivery end, uprights 54, 54 connected by transverse bars 56, 62, 64. The end structures are connected by front and rear plates 68, 70. The frame is supported on casters 72. An endless conveyer belt 74 is trained over an idler roller 76 and over a driven roller 78, the latter having a rubber covering 84 and being chain driven by a motor 92 mounted on the bar 62. Longitudinally spaced transverse channelshaped cleats 86 are secured to the belt. The upper stretch of the belt is supported by a plate 88 welded at its edges to the front and rear plates 68, 70 and having a rear notch 90. A guide plate 130 secured to the plate 88 is disposed against the front marginal edge of the belt. A longitudinally extending guide member 188 is secured to the rear ends of three spaced bars 192 slidably supported by the frame and is adjustable transversely by three screwed shafts 202 operated by handwheels 204. The workpiece is urged transversely against the guide member 188 by rubber rollers 218, one at the loading end and the other at the delivery end. Each roller is carried by a pivoted arm 220 biased by a spring 226. Downward pressure is applied to the workpiece by a number of roller assemblies 44. Each assembly has a number of rubber rollers 242 rotatably mounted in a bracket pivoted to a bar 240. A tension spring 275 has one end releasably anchored in one of a number of apertures in an upwardly extending part 268 of the bracket and the other end anchored in an aperture in an upwardly extending bar 272 secured to the bar 240. The latter is welded to end crossbars 276 and an intermediate cross bar. At each end of each crossbar is a threaded stud 290. The studs extend through elongated vertical slots 294 in the end uprights 52, 54 and in intermediate vertical channel members 280, 280 secured to the front and rear plates 68, 70. The bar 240 having been adjusted to the desired height is secured in that position by nuts 296, 296 on the bolts 290. The first cutter assembly has a stone disc 108 of comparatively coarse composition mounted on the shaft of a motor 106. The second cutter assembly has a stone disc 116 of comparatively fine composition mounted on the shaft of a motor 114. The third cutter assembly has a stone disc 124 of extremely fine composition mounted on the shaft of a motor 122, The motors are individually adjustable transversely of the apparatus, each motor being supported by a base-134 adjustable on a plate 146 by a screwed shaft 160 connected by a universal coupling 164 to a shaft 158 operated by a handwheel 162. The forward end of the plate 146 rests on the horizontal leg of an angle bar 150 rigid with the rear plate 70, and a pin 152 extends through the end of the plate and through slightly elongated slots 154 in a pair of lugs 156 rigid with the rear plate and angle bar ; secured to the bottom plate 144 of the base 134 is a tubular standard 168 internally threaded at its lower end to receive a threaded part 176 of a foot member having a rounded sole portion 174 and rotatable by application of a tool to a polygonal portion 178 to effect adjustment. Motor stabilizing means includes a pair of finely adjustable turnbuckles 180, the rear end of each turnbuckle having a pivotal connection with a bracket 182 secured to the bottom plate 144 of the base 134 and the forward end having a pivotal connection with a bracket 184 rigid with the angle bar 150. A reservoir 48 has a sloping bottom 300 and a splash pan extension 306 secured to the transverse bar 64 and serving to protect the motor 92 from splashed water. Sediment collecting in the reservoir is removed through a hole closed by plug 308. A float device 310 serves as a guide for replenishing the reservoir with water. A pump 312 driven by a motor 314 supplies water from the reservoir to a dual spray nozzle 320 for each of the stone discs.