Patent GB-1130992-A (GB)
Title: Finishing machine
IPC: B24B7/22
Filed: 1966-08-05
Abstract: 1,130,992. Grinding. J. P. ZACHEK. 5 Aug., 1966 [30 Sept., 1965], No. 35230/66. Heading B D. Apparatus for finishing the side. wall surface or surfaces of elongate wall-like members 11, which may be of concrete or wood, comprises a pair of housing assemblies 12, 14 secured beneath a frame 10 in spaced relation so as to straddle an elongated wall-like member, each housing assembly having finishing means 40, 41, 42 attached thereto for finishing said surface or surfaces, the finishing means each being positionally adjustable independent of each other, and a driving assembly 16 fixedly mounted beneath the frame between the housing assemblies and arranged to ride on a top surface of the wall-like member. The housing assemblies are adjustable along the frame to accommodate different thicknesses of wall-like members and can be adjusted to a tilted position for finishing members having sloping sides. Guide wheels 18, 19 engage the surfaces of the member 11 to guide and balance the machine as it moves along the wall. The frame of the machine carries a water tank 24, a compressor 28 and an engine- 26 which, through a clutch 29, drives an output shaft 97 connected by a chain drive 106 to a shaft 110, each end of which is connected by a universal coupling 126 to a respective shaft 128, 129 in a housing 12, 14, the couplings permitting the tilting adjustment of the housings. Each shaft 128, 129 carries a sprocket 135, 136, and each sprocket is connected by a chain 137, Fig. 6, to driving sprockets 71, Fig. 14, secured on pivot shafts 70 and to sprockets 69, in turn, connected by separate chain drives 72 to shafts 48 carrying grinding wheels 40, 41, 42. The shafts 48 are rotatably carried in the ends of L-shaped levers 63 mounted on the pivot shafts 70, the other ends of the levers being connected to adjusting screws 73 whereby the vertical positions of the grinding wheels are independently adjustable. The shafts 48 are also axially movable in the levers 63 and air cylinders 86 have rods 76 engaging the shafts to yieldably urge the grinding wheels into engagement with the surfaces of the walllike member 11 at pressures determined by the setting of valves 90 to 95 in the line from the compressor. Each shaft 48 is polygonal in crosssection and has a tapered end 49, Fig. 9, and annular groove 50, and each grinding wheel has a coupler 53, Fig. 8, having a polygonal recess for receiving the end of the shaft and a pair of slots 57, 58. A U-shaped pin engages the slots and groove for releasably retaining the grinding wheel on the shaft, the tapered end of the shaft loosely engaging the coupler so that the grinding wheel is movable relative to the shaft to accommodate irregularities in the surface of the member 11. The driving assembly 16 is mounted below the frame 22 and consists of three axles, each carrying a pair of wheels. Two of the pairs of wheels are interconnected by a chain drive, and one of the pairs is driven from a gear-box having an input shaft 179, Fig. 4, driven by a chain 176 from a shaft 171. A friction disc 168 mounted on the shaft engages by its periphery a clutch disc 164 which is spring urged against the friction disc and mounted on a shaft 97 driven from the engine 26. The clutch disc can be moved away from the friction disc while the latter is moved relative to the clutch disc to vary the speed and direction of movement of the apparatus along the wall. Water is supplied to the grinding wheels from a pair of pipes 43,44 which have valves 45 and are connected to the tank 24, the water cooling the grinding wheels, eliminating dust, and producing a mixture which tends to fill pot holes in the surfaces being ground. The vertical positions of the grinding wheels can be adjusted by the screws 23 to accommodate different heights of walls, and different sizes of grinding wheels may be used. An extension 191, Fig. 1, may be fitted to the lower end of one of the housings to extend the area being ground.