Patent GB-190824488-A (GB)
Title: Improvements in Reversing Gears.
Filed: 1908-11-14
Granted: 1909-11-04
Abstract: 24,488. British Hele - Shaw Patent Clutch Co., and Lindblom, H. Nov. 14. Reversing-gearing; clutches.-Relates to reversing-gearing of the class in which reversed driving is effected through bevel - gearing carried in a revoluble cage which may be held against rotation. Both forward and reversed drives are effected through one friction-clutch 10, Fig. 4, which may be allowed to slip. The parts of the gear are locked together for a solid drive by a combined claw and friction clutch 27, 23, Fig. 4. The clutch 10 is preferably of the multiple-plate type. One series of friction-plates revolves with a casing 7 loose on, and embracing the ends of, the driving and driven shafts 1, 2. The other set revolves with a core 9 fast on the shaft 1. One bevelwheel 4 is secured to the casing 7. The other bevel-wheel 13 is secured to a disk 14 keyed upon the shaft 2. The cage 15, which carries connecting bevel pinions 16, Fig. 3, is supported on rollers 17 bearing upon the periphery of the casing 7. For reversed driving, a brake 21 is applied to the cage 15, and the wheel 4 is gradually connected to the shaft 1 by the clutch 10. For forward driving, the disk 14 and the casing 7 are first connected by a special positive clutch, and then the clutch 10 is gradually applied as before. To the casing 7 is secured a disk 25, Figs. 4 and 7, having an external conical friction surface and a toothed face 26. Teeth 27 carried by a slider 28 pass through holes 30 in the disk 14 and are adapted to grip the face 26 positively. To avoid shocks during engagement, a coned ring 31 is provided secured to a coned annular disk 23. The disk 23 is adapted to grip the disk 25 prior to the advancement of the teeth 27. Balls 32 are arranged between the slider 28 and the ring 31 so that as the former begins to advance the latter is wedged outwards and the plates 23, 25 are thrust into frictional engagement. The clutch 10 and the slider 28 are operated through collars 11, 29 by a single lever 47, Figs. 1 and 2, which also operates the brake 21. This brake 21 is in two parts which are tightened simultaneously by a pair of pins 46 set eccentrically in gudgeons 44. A rocking bow frame 40 pivoted upon the gudgeons 44 carries the lever 47. Movement of the lever 47 and the bow 40 together towards the right of Fig. 1 applies the brake 21. The collar 29 is operated through a lever 52 which is formed with a cam-slot 55 engaged by a pin 56 upon the bow 40. The lever 52 is formed in two parts connected by a spring 54 to allow the frame 40 to complete its movement without respect to the relative positions of the teeth 26, 27, Fig. 7. A lever 59 connected to the collar 11 is connected by link-work 58, 57 to the lever 47, which can rock relatively to the bow 40 about a transverse pivotpin 48. A projection 62, Fig. 2, is provided upon the lever 47, which by entering recesses 63 in a fixed main frame 22 locks the bow 40 in gear positions. In a modified arrangement, the collars 11, 29 are operated from a single cam secured to the bow frame, which is turned from a handwheel through worm gearing.