Patent GB-190427731-A (GB)
Title: Improvements in or connected with Driving and Reversing Mechanism for use with Steam, Oil or other Power Propelled Vehicles, Stationary Engines or Mechanism.
Inventor: CAREY ROBERT FALKLAND
Filed: 1904-12-19
Granted: 1905-12-19
Abstract: 27,731. Carey, R. F. Dec. 19. Driving - gear.- Change-speed and reversing gearing used in conjunction with band braking- mechanism on power - propelled road vehicles, stationary engines, or other mechanism, comprises linkmotion appliances controlled by screw-and-nut mechanism driven by toothed gearing through clutches from the main engine shaft, and adapted to transmit varying amounts of motion to one or more cams, mounted on a rocking frame and gearing with friction wheels on the road-wheel axle. Fig. 1 shows links 7, 27 connecting the rocking frame 4 to the cranked driving-axle 1<a>, which is driven by bevel gearing from the main driving- axle 3. The rocking frame 4 is mounted loosely on the road-wheel axle 5, and carries a.cam 8, which is pivoted at 6 and is adapted to engage and impart varying motion to the friction wheel 14 on the axle 5. A bar or frame 10, pivoted at 11, is connected at one end to a bar 9 fastened to the cam, and at the other end to the axle 13 of the reversing-lever by spring arms 12 or other suitable connections such as toothed gearing, bell cranks, and the like. By movement of the reversing- lever, the frame 10 is rocked about its pivot and thereby varies the angular position of the cam 8 for driving the axle 5 in opposite directions. To change speed, the angular position of the lever 27 is adjusted by means of the nut 25, at the end of the lever 26, which engages a screw 15 mounted in a frame 16 and operated in either direction by spur and bevel gearing from the shaft 53 by means of clutches 21, 22. The shaft 53 is driven from the shaft 3 by spur gearing 23 or chain gearing 24. To prevent the gear from being suddenly reversed while the vehicle is moving, the reversing-shaft 13 is normally locked by the projection 48 engaging a similar projection on the lower end of the lever 52 ; when the nut 25, however, approaches the upper limit of its travel, it engages the upper end of the lever 52, which is loosely mounted on the shaft 38, and thereby moves the lower end against the action of the spring 51 to release the shaft 13. In the highest position of the nut, the cam has no working motion on the friction wheel, and the vehicle runs free, or is stationary. The operating- handle on the shaft 28 is provided with a suitable pawl and retaining-catches, and controls the sliding clutches 21, 22 by means of levers 30, 33 secured to the loose sleeve 34 of the rod 35. Motion is transmitted to the latter rod by the compression of an encircling spring, and the rod transmits the motion to the clutch-operating lever 36. The other end of the rod 35 is linked to the shaft 38, which has a second arm 39 connected to a rocking linked framework 40 having pivoted end levers 41, 42, engaging the moving nut at the ends of its travel and operating the shaft 38 to throw the clutches 21, 22 out of action. When the shaft 13 is in the reverse position, a pin 44, which passes through the lever 37 and is linked to the shaft 13, engages the nut 25 in its travel and throws the clutches out of gear, thus limiting the maximum reverse speed. The ends of the brake band 31 are connected to arms on the shaft 28, and the brake is applied by a further movement of the operating-lever in the same direction after the clutches have been released. The brake may be applied by separate mechanism, and the cam and friction disc may be replaced by a pair of toothed free-wheel devices on the road-wheel shaft, adapted for operation in opposite directions by a pallet on the rocking frame. Several rocking frames, friction wheels, and cams may be mounted in different angular positions on the road-wheel shaft to impart a continuous driving motion to the axle. The engine may be made self-regulating by means of the governor attached to the clutch 22. When the engine speed slackens due to overload, the governor forces the halves of the clutch 22 into engagement by moving the rod 35 against the action of the spring surrounding it, without moving the operating-lever on the shaft 28. The sliding nut is thereby automatically operated to reduce the speed of the vehicle until the engine regains its normal speed. The hollow sleeve 34 can be used to vary the speed at which the governor acts by adjusting its position to vary the tension on the spring when the operating lever is in its 'off' position. The Provisional Specification states that a cam may be provided on one of the connections between the operating-lever and the rocking bar, so positioned that, when the lever is in the brake' position, the cam lifts an arm, thus tightening a wire or a brake band.