Patent GB-190808791-A (GB)
Title: Improvements in Change-speed and Reversing Gear for Self-propelled Vehicles.
Inventor: ROBIN ALBERT HENRI
Filed: 1908-04-22
Granted: 1909-01-14
Abstract: 8791. Robin, A. H., and Janvier, V. P. F. April 23, 1907, [date applied for under Section 91 of Patents &c. Act, 1907]. Motor road vehicles.-Relates to the arrangement of, and interlocking controlling-mechanism for, change-speed gearing in which an additional speedvarying device is combined with the ordinary change-speed gear, permitting the multiplication of each of the usual speeds. The main casing, Fig. 1, contains the change-speed gear and the differential and transmission mechanism. The additional speed-varying device is arranged in a separate compartment on the right, and comprises gearing by which a direct drive is obtainable from a shaft a, driven by the motor, to a shaft b, or an indirect drive through a countershaft h. For the direct drive, clutch teeth on a pinion b<1>, which is slidably keyed to the shaft b, engage teeth on a pinion a<1>, keyed to the shaft a, while for the indirect drive, the pinions b<1>, h<2> are moved into gear with the pinions h', a<1> respectively. In the change-speed gear, a shaft c carrying a bevel-pinion g is directly driven from the shaft b to give the first speed, or indirectly through a countershaft e for the second, third, or reverse speeds. For the first speed, a movable gear-wheel c<1> fits on to the teeth of a wheel b<2>, thus clutching the shafts b, c together. For the second and third speeds, the countershaft e is driven from the shaft b by gearing b<2> e', and drives the shaft c through either of the pairs of gear-wheels e<2>, c<1> or f<1>, d'. The reverse drive is obtained by throwing into gear with the wheels f<2>, d' an intermediate pinion l, shown in Fig. 7. The wheels c<1>, d' and the reverse pinion are operated by sliding rods c<3>, d<3>. The rod c<3> acts directly on the wheel c', and is operated by an arm d<4>, Fig. 8, shaft k, arm k<1>, and rod c<5>. The rod d<3>, which is operated through a sleeve k<2> from a rod d<5>, acts directly on the wheel d' and, through lever mechanism, on the reverse pinion so as to hold the latter pinion stationary during part of the movement of the former. The wheels for the speed-varying device are operated simultaneously by means of a rod i<5>. The rods c<6>, d<5>, i<5> are connected respectively to the arms c<6>, d<6>, i<6>, shown also in Figs. 3 and 6, the first two of which, for controlling the ordinary change gear, are operated by a hand-lever n, while the third arm controlling the speed-varying device is operated by a hand-lever o. The lever n is pivoted so as to move in two directions at right-angles, and is adapted to move laterally while in the central position so as to engage one or other of two sectors c<8>, d<8> and operate it in either direction, the disengaged sectors being held by either of two springs r, the other spring being released by stops n<3> on the lever. The sectors are connected by sleeves to the arms c<6>, d<6>. The hand-lever o controlling the speed-varying device is pressed continually by the spring t<3> into the position giving the direct drive, and when moved into the position giving an indirect drive, may be held there by means of the pawl u<1> engaging the notch u<2>, if the hand-lever n is then in one of the positions corresponding to the several speeds. To ensure this, a projection u<4> on the pawl is pressed by a spring u<3> against a sector v, which has suitable recesses v<2> and is connected to and moves with the hand-lever n. This arrangement ensures that any movement of the lever n to change the speed adjusts the speed-varying device, if necessary, so as to give a direct drive. The differental gear and a reduction gear between the differental and chain sprockets is arranged so as to be enclosed within the casing. The lever-wheel g drives the differental gear, the driven members of which are connected by toothed gearing j<2>, j<3> to the shafts carrying the chain sprockets.