GB224274A - Control for friction clutches - Google Patents

Abstract

224,274. Bichteler, H., and Aktieselskabet Asra. Aug. 1, 1923. Variable-speed gearing; clutches, friction.-Rotary driving and driven members 11, 12 are connected bv a friction clutch 13 and a rotary controlling member 15 and the clutch is engaged and disengaged according as the speed of the driven member 12 is below or above that of the controlling member 15. The member 15, which is driven or allowed to rotate at a speed less than that of the driving-member by suitable means, is formed as a nut screwing upon a member 14 fast on the shaft 12. The member 15 is connected with the member 11 so as to move the latter axially when screwing takes place. When the shaft 12 and controller 15 are turning at the same speed, the screw-and-nut mechanism is turning solid. The moment the driven member overruns the controller, screwing takes place, disengaging the clutch enough to allow slip. A spring 8 effects the reverse motion. A modification is described in which the clutch is in the form of a band applied by a toothed sector and central pinion, relative turning of the pinion releasing the band. In another arrangement, shown in Fig. 5, a friction coil 36 extends from the far end of a driven drum 34 round that drum and round the driving drum 30, the end being secured to the controller, which is a toothed wheel 38. When the drum 34 overruns the controller, the coil 36 unwinds, allowing the clutch to slip. Reference has been directed by the Comptroller to Specifications 1880/82, 10318/90, 173,533, and 191,061 (as open to inspection under Sect. 91 of the Act).