Change speed mechanism

摘要

387,311. Controlling change speed gearing. MENESSON, M., 27, Boulevard du Parc, Neuilly-sur-Seine, France. April 27, 1931, No. 12426. Convention date, May 9, 1930. Void [Published under Sect. 91 of the Acts]. [Class 80 (ii).] A gear shift for a conventional change gear 23, Fig. 3, is automatic in the sense that when a dog 32 is held by a spring 37 in engagement with a striker 28, successive depressions of an engine clutch pedal (not shown), acting through a lever 57, Fig. 5, effect change from middle speed to direct drive and back again. The dog 32 is rigid with a bolt 33, Fig. 3, slidable laterally in a slider 35 supported on a fixed guide bar 39 parallel to two gearshift guides 25, 26. A stud 40 on the slider 35 engages a forked lever 42 supported on a fixed pivot 43 and engaging at 44 with a flylever 46 supported on a fixed pivot 47. Pivoted to the fly-lever are two hooks 48, 49 pressed together by springs 66, 67 and adapted to engage alternatively over a stud 54, Fig. 5, carried by a slide bar 55 operated by the engine clutch pedal. The bar 55 carries a V-shaped latch 61 which co-operates with ramps 52, 53, Fig. 11, on the hooks 48, 49, so that on successive reciprocations of the bar 55, the stud 54 is engaged alternately by the two hooks, and the fly-lever is canted one way and then the other so that through the lever 42, slider 35, and dog 32, the fork 28 is struck alternately to the opposite ends of its travel for middle and high speeds. To engage the low speed, as in starting a vehicle, the dog 32 is first moved across to engage another fork 27, Fig. 3, by a manual pull on a cable 38 which compresses the spring 37 and allows another spring 34 to expand. Depression of the pedal then causes the stud 54 to pull the hook 48 and move the slider 35 appropriately, the latch 61 holding the other hook free. To effect reversed driving, a manual pull on a second cable 65, Fig. 5, through a bolt 63 causes a tappet 62 to tilt the latch 61 so as to change the engagement of the hooks, Fig. 11, prior to the pedal actuation.