Patent GB-418783-A (GB)
Title: Improvements in or relating to variable speed gearing
IPC: F16H33/06
Filed: 1933-10-02
Abstract: 418,783. Variable - speed gearing. FONTANA, C., 5, Via Saponiera, La Spezia, Italy. Oct. 2, 1933, No. 27008. [A Specification was laid open to inspection under Sect. 91 of the Acts, April 3, 1934.] [Class 80 (ii).] Variable-speed gearing, automatic in accordance with the load, comprises an intermediate member, oscillated by a driving eccentric about two centres alternately, either centre being momentarily held stationary in turn by one-way detents, to which the intermediate member is connected through load-responsive springs or elastic fluids, the intermediate member imparting its movement, in one direction only to a driven-member, which is prevented, by the detents, from reverse rotation when not actually being driven. The driving-member may rotate intermittently or continuously in either direction, or it may oscillate, but the driven-member always rotates continuously in the same direction, or under heavy loads it may remain stationary. One or more additional correlated driven-members, driven through epicyclic-gearing, may be provided. In Fig. 6, a disc 4<1>, mounted on a driving eccentric 4, carries pins 28 engaging diametrically-opposite slots in the intermediatemember 9, which has further slots at rightangles to the first pair and engaged by pins 31, rigid with a driven-pulley. The intermediatemember 9 is also connected, through pins 36<1>, 36<11> and telescopic load-responsive spring-links 39, 40 with one-way detents 17, 19, which co-operate with the fixed casing 1 in such a way that one pin 361 or 36<11> is momentarily held whilst the intermediate member is turned about it by the driving-pins 28; to advance the drivenmember by an amount determined by the initial compression of the springs 39, 40, which depends on the load P. Each one-way detent comprises a pair of toothed pinions 19, 20, Fig. 4, connected by a link 41, and meshing with a fixed ring of teeth 21 on the casing 1. The pinion 20 carries a roller 44<1>, bearing inside the casing so that the pinion 20 is permanently meshed with the teeth 21, whilst the pinion 19 carries a smaller roller 43<1>, which, according to the direction of thrust on the end 371 of the telescopic link 39, is moved into or out of contact with the casing 1, so that in the forward direction, the pinion 19 clears the fixed teeth 21 and permits forward rolling movement of the pinion 20, whereas in the reverse direction it locks the pinion 20 and prevents reverse movement of the driven member. The rings 21 of teeth are duplicated at each side of the casing. The driven member may, if desired, be fixed and the casing be allowed to rotate in the reverse direction. Fig. 8 shows a modification having three correlated driven-members carrying loads P, P<1>, P<2>, attached to cords passed over pulleys secured to them. One driven member is the casing 1, which may be locked at will by a detent 59. The second driven-member is a pulley 68, connected to a toothed annulus 65, driven by the toothed periphery of the disc 4<1>, mounted on the driving eccentric 4. The third driven-member is a pulley 11 as in the previous construction, and the pulleys 11, 68 can be frictionally braked by shoes, operated by screws 74, 71. With the casing locked, the driven pulley 68 may be rotated in either direction, according to the direction of rotation of the driving shaft 5, but the driven-pulley 11 always rotates in the same direction and one load may be caused to assist the other in a variety of ways. There may be three or other number of staggered groups of oscillating eccentrics and intermediate members. Specification 253,416, [Class 80 (ii)], is referred to. The Specification as open to inspection under Sect. 91 states also that cranks may be used in place of eccentrics and that the one-way detents may be pawls, friction-shoes or electromagnetically operated systems. These statements do not appear in the Specification as accepted.