Patent GB-560293-A (GB)
Title: Earth-excavating scrapers
IPC: E02F3/64
Filed: 1942-08-05
Abstract: 560,293. Steering motor vehicles. DEHN, F. B. (Euclid Road Machinery Co.). Aug. 5, 1942, No. 10933. [Class 79 (v)] [Also in Group XXI] An earth excavating scraper comprises a twowheeled tractor 10 with a rear upstanding structure 12 connected by upper and lower pairs of pivoted links 13, 14, to the scraper bowl 15, fluid rams 105 being connected to a tube 103 fixed between the links 13 and acting to raise and lower the bowl 15 ; the latter comprises side walls 21 reinforced at their upper parts by welded channels 35, and at their lower parts by plates 21a, 21b and connected at their front and rear ends by box beam structures 22, 23, Fig. 5, and a bottom plate 24 reinforced by a channel beam 26, plates 27, 28 and parallel longitudinal bars 29, and carrying a digging edge 25 preferably curved upwardly and forwardly near the side walls. A cast digging tooth 21c is provided at each end of the blade. The bowl is provided with a front gate 42 pivoted to the sides at 44 and connected by a link 46 to a pivoted cranked lever 39 acted on by a fluid ram 37a to open andclose the front gate ; rollers 48a support the front gate. Projecting from, and fixed to, the rear of the bowl is a tail piece comprising tapered side channels 32, top and bottom plates 31, 33 and a bumper 35<1> through which an auxiliary vehicle may push the scraper ; an ejector gate 49 of box construction has a rearward extension 57 of a shape corresponding to that of the tail piece and guided therein by rollers 62 engaging channels 36, a fluid ram 63 being pivotally supported at 64, 65 by the tail piece and ejector gate respectively and acting to advance the ejector gate to discharge material from the bowl. The ejector gate is supported by rollers 54 running on tracks 51 on the bowl sides, bars 50 engaging below the tracks to prevent rising of the ejector gate ; the tracks 51 are cut away forwardly at 51a to. permit the ejector gate, to be positioned in the bowl. To the bottom edge of the ejector gate is pivoted a flap 53 rein-. forced at the sides by plates 53a, the flap extending downwardly and forwardly when the gate is in its rear position and substantially vertically, and, if desired, past the digging edge 25, when the gate is in forward position. The rear of the scraper bowl 15 is supported by wheels 17 on an axle 68 carried by a trunnion 66, Fig. 3, for lateral tilting, the wheels 17 being adjusted for steering by a fluid ram 18, Fig. 2, acting through a lever 73, link 75, knuckle 76 and arms 77 connected by a tie rod 78. Fluid supply to the ram 18 is controlled by a steering column 79, Fig. 7, which, through worm gearing, adjusts a pitman arm 81 connected to a link 83 which, at its forward end, is connected to a lever 84 pivoted at one end to a rod 87 carrying pistons 88, 88a in aligned cylinders, the lever 84 being connected at the other endto a link 90 operating a valve 89 and by pin and slot to a link 86; on adjusting the steering column 79, fluid supplied by a pump 91 acts on the piston 88 and the piston 88a moves therewith to supply fluid through pipe 94 or 95 to the ram 18. For attachment forwardly to an auxiliary vehicle, a pull-bar 111 with a spring take-up 112 is provided, the pull-bar being raised or lowered by a lever 116 acting through a toggle 117 ; springs 118 return the pull-bar after lateral movement.