Patent GB-142926-A (GB)
Title: Improvements in farm tractors
IPC: B62D49/00
Filed: 1919-02-13
Abstract: 142,926. Murnane, C. Feb. 13, 1919. Controlling different functions by same lever; relay apparatus. - A tractor comprises a pair of driving and steering wheels mounted on a frame carrying the motor and gearing, and a pivoted draw-bar to which different implements may be coupled. Steering is effected by power-operated means which effect the swinging of the tractor frame with respect to the draw-bar, and are controlled by a pair of reins passing over pulleys mounted on a lever; the reins may be so operated as to move the lever bodily and effect the control of the main clutch, brake, and reversing-gear. The lever 74 is pivoted at its lower end and is fitted with a pivoted head 84 carrying pulleys 83 over which the reins 69 pass. The reins are fitted with a chain section passing over a sprocket 85 at the foot of the lever, the sprocket being fitted with an adjustable crankpin 86 operating an adjustable rod 87 connected to a balanced lever 88. The lever 88 carries a shaft 90 on which is mounted a friction wheel 91 which, when the lever 88 is depressed, comes into driving engagement with the flywheel 52 of the motor. Mounted on the same shaft 90 is a pulley 92 over which passes a belt 94 carried on the fly-wheel. When the lever 88 is raised, the belt is tightened and the shaft 90 is then driven in the reverse direction. The lever 88 is raised or lowered by operating one or other of the reins through the crank-pin 86 and lever 87. The shaft 90 is universally connected with a shaft 101 which, through worm gearing, operates a vertical shaft fitted with a pinion engaging a toothed sector on the draw-bar. The lever 74 is normally pressed forward by a spring 79 and links 80. 81 and is fitted with a latch-bar 75 having a cam 82 and notch 77 engaging a pin 76 on the dash-board. The clutch 53 is operated by means of arms 72 on a transverse shaft 70 on which the lever 74 is mounted; by pulling both reins slightly and releasing them quickly, so that the pin 76 misses the notch 77, the lever 74 moves forwardly under the influence of the spring 79, and the clutch is thrown in. In the position shown, the clutch is disengaged and a transmission brake applied, which comprises brakes 109 engaging a brake-wheel 108 on the main shaft and operated by a rocking cam shaft 112 connected by an arm 115 and link 116 with the lever 74. The reversing-gear is operated by a quick rearward movement of the lever 74. The gearing comprises a pair of bevel-gears 57, either of which can be clutched to the main shaft and are in mesh with a bevel-gear 60 on the transmission shaft; the clutch 58 is controlled by a rock-shaft 120 fitted with a tumbler arm 122 and a pinion engaged by rack-bars 125, one or other of which is operated to throw the tumbler 122 over by the rearward motion of the lever 74. The tractor wheels are driven by pinions 24 on a differential shaft 18 which is driven at either of two speeds by pinions 62 adapted to be clutched to a transverse shaft 61. The pinions are thrown into operation by a dog-clutch 65 operated by a hand-controlled tumbler arm 67. The tractor wheels are carried on pivoted arms 20 the ends of which are connected to the main frame by adjustable springs. A winding-drum 143 is fitted to one of the wheels, and a power pulley 59. which may be connected by a universally-jointed driving-shaft to a reaper, binder, or harvester drawn by the tractor, is provided.