Patent GB-479679-A (GB)
Title: Improvements in harvester-thresher
IPC: A01D41/00
Filed: 1936-08-04
Abstract: 479,679. Harvesting and thrashing machines. ALLIS - CHALMERS MANUFACTURING CO. Aug. 4, 1936, No. 21445. Convention date, Aug. 10, 1935. [Classes 6 (iii) and 58] The machine is carried upon wheels 11 mounted in journals on a steel tube 10 upon which are secured a frame 12 acting as a drawbar support and carrying a power shaft driven from the tractor and a framework supporting the housing 13 of the thrashing mechanism, a frame 14 for the cutting and elevating devices and a housing 15 for the dressing mechanism. The knife bar is carried between side walls 17 fitting within the side walls 19 of the housing 13 and pivoted thereto so that the cutters may be adjusted by a rod 25 pivotally mounted on the draw-bar frame. The side walls 17 mav be flanged at their upper edges, the flange 18 on the outer wall being tapered and extended to act as a divider and guide for the grain ; on the other side a guard 34 protects the knife actuating mechanism and also assists in guiding grain to the cutter. A belt-conveyer 38, the full length of the knife bar, carries the cut crop to the thrashing cylinder 52, the feed to this cylinder being assisted by a short upper conveyer 48 which preferably travels at a slightly higher speed than the conveyer 38. The crop is pressed on the knife bar by a rotary reel mounted so as to be adjustable vertically and longitudinally of the machine. The thrashing cylinder comprises an openwork drum 54 carrying angle iron thrashing bars 56 which is mounted on a shaft 53 and co-operates with a concave 57 having a ledger plate at its front end adjacent to an adjustable ledger plate 59. Strips 61 integral with or secured to the concave project into proximity with the beater bars. The bearings of the shaft 53 are adjustable so that the position of the drum relative to the concave may be varied. The bottom of the concave may be perforated so that grain may fall therethrough to the grain pan or all the grain may be swept with the straw and the casings through the discharge passage 63 to the housing 15 for the dressing devices. This housing extends transversely of the machine along and beyond the thrashing mechanism and is provided with a straw shaking rack 65 actuated by an arm 68 and eccentric 70. The grain falls through the rack on to a pan formed by the bottom plate 71 of the housing along which it is carried by a drag 72 to a cleaning device 74 comprising a series of superposed shaking screens 75. The cleaned grain is carried by a conveyer 76 and an elevator to the grain bin 16, the tailings dropping into the casing of a conveyer 78 by which they are moved to an elevator 79 that discharges them into a conveyer 81 leading to a shoot 80 opening into the forward end of the thrashing drum housing. The conveyer 81 is preferably provided with a screen to act as a recleaner and grain passing through this screen s carried by a shoot 85 to the grain pan. The various mechanisms are driven from a power shaft 93 carried by the tractor through universal joints 91, 90 and a shaft coupling 92, a shaft section 85 mounted at its forward end in a spherical bearing 89 and connected at its rear end by a combined slip clutch and telescopic connection to a shaft section 86 driving the power shaft 95 and 98.