Patent GB-1373590-A (GB)
Title: Pavement cutting machine
IPC: B23D59/02
Filed: 1972-02-29
Abstract: 1373590 Road surface cutting machines C W HATCHER and G WARNER 29 Feb 1972 [1 March 1971] 9185/72 Heading E1G In a vehicle, Fig. 1, having one or more rotary cutting cylinders 48, 50 for removing bumps from, or cutting multiple anti-skid grooves in, a road surface, the cutting cylinder 48, Fig. 20, is supported for height and camber adjustment in bearings 79, 84 respectively, on a frame 52 and a floating beam 90, the forward ends of the frame and beam being hinged on horizontal axes 53, 93 to a member 54 which is itself supported for limited transverse tilting - e.g. on a ball joint 55 - while the rear ends of the frame and beam are raised and lowered (a) jointly by a hydraulic cylinder 96, or (b) relatively to each other by a hydraulic cylinder 101. The rear end of the U- shaped frame 52 shown is guided for lifting and tilting by a pin 56 engaging a vertical slot 58 and is controlled by two lifting cylinders 96, 97. As shown a second offset parallel cutting cylinder 50 has its inner end supported by a second floating beam 88 actuated by a cylinder 102. The rear ends of the floating beams normally seat in U-brackets 94 on the frame 52. The hydraulic cylinders 101, 102 reacting on the frame 52 actuate the floating beams 88, 90 to adjust the inner ends of the cutting cylinders 48, 50 for a concave or convex road surface. The frame 52 is raised (for transit), lowered, or tilted by the hydraulic cylinders 96, 97. Alternative arrangements of cutter cylinders and floating beams are illustrated in Figs. 27-29 (not shown). The cylinders 96, 97 react on the frame of a rear-wheeled trailer 26, Figs. 1, 7, supporting the cutter unit, the trailer 26 being articulated at 20, 29 respectively to a front tractor 12 and a rear be applied (through cylinders 96, 97) to the water tank trailer 28 whose weight can thus cutters. The depth of cut is controlled by adjustable rocking pairs of rollers such as 190, 193, Fig. 7 or, for bump removing by single rollers. Details can be seen in Figs. 12, 14, 18 (not shown). The tractor 12 has an engine 16 driving its rear wheels either (during transit) through a conventional transmission or (during low-speed road surface cutting) through a hydraulic motor. Fig. 24 (not shown) illustrates a common hydraulic system powered by the engine (16) for controlling (a) the lifting cylinders (96, 97, 101, 102); (b) the low-speed wheel drive motor (234) and (c) a power steering cylinder (231). Water-spray and pick-up. The rear trailer 28 comprises a tank divided into five compartments 162a. .e which communicate through successively-smaller filters 170, Fig. 6, and air openings 179. Clean water (or other coolant) from compartment 162a is supplied by pump 108 to multiple spray nozzles (116, Figs. 14, 15, 19 not shown) adjacent the cutter cylinders. A vacuum pump 132 reduces air pressure in the tank so that a pick-up shroud 142 sucks up water and sludge from the road through pipe 156 and deposits it in the rear compartment 162e. The suction pick up, Fig. 20, is effected by inner and outer arrays of suction nozzles depending from tubular suction manifolds on pipes 150, 152, 160. Fig. 17 (not shown) illustrates a sludge pick-up trough (198) provided with a thermocouple sensor (199) to operate a warning light if the sludge becomes too hot. Means are provided for laterally adjusting the frame 52 for cutting close to a kerb, Fig. 16 (not shown).