Patent GB-194628-A (GB)
Title: Improvements in or relating to electrically operated change speed gear
IPC: F16H63/30
Filed: 1922-08-26
Abstract: 194,628. Ter Cock, C. Aug. 26, 1922. Controlling variable-speed gearing.-Variablespeed gearing suitable for motor vehicles is controlled by a rotary control handle operating a series of electric switches actuating, through solenoids, a selector shaft which turns and also slides longitudinally. The handle 7, Fig. 8, is similar to that described in Specification 173,802, being slid longitudinally to operate a switch r for reversed driving. The selector shaft 18, Figs. 1, 2, and 3, is turned to make selection in either direction for gearing up and down respectively by two star wheels u, v operated step-bystep by plungers D<2>, E<2> and solenoids D, E. There are spring stops e, Fig. 2, to ensure proper step motion while allowing the star to be turned backwards. Turning the shaft 18 brings shifter projections g<0> - - g<4> into the paths of levers 19, 20 having scissor-like motions and operated by a single plunger C<2> and solenoid E as described in Specification 183,410, the shaft being thus thrust longitudinally to operate one of a set of striker rods 10<a>, 10<b>, 10<c> in one direction of the other. The actual gear-engaging pull of the plunger C' is moderated by a dash-pot to facilitate engagement. Tu each of these striker rods is secured one of three triangular carriers 11<a>, 11<b>, 11<c>, the other two rods passing loosely through and being guided by each carrier. Projections S‹ - - S<4> on the shaft 18 are adapted to be turned into engagement with jaws 5<a>, 5b, 5<c> on the carriers, so as to carry the carriers along in the sliding movement. Springs 28 return the bar 18, and may be arranged upon a separate bar 27 with suitable engaging snugs t<0> - - t<4>. The carriers have locking plates 12<a> - - 12<c> engaged by spring bolts 13<a> - 13<c>, which are positively withdrawn by the first turning movement of the handle 7. The solenoid B, Fig. 12, has two cores or plungers C<2>, B<2>, each of which is adapted to be locked and thereby to constitute a stop for the other plunger. This locking is effected by bolts 44. 45 and a rocking lever 43 controlled by an auxiliary solenoid A. The plunger B<2> is for unlocking the carriers 11, which it accomplishes through a lever 32, shaft 34, cranks 35<a> - - 35<c> and levers 16a - - 16<c> which withdraw the bolts 13<a> - 13<c>. A master switch 52 with its companion 52<1> are provided as described in Specification 183,411. Within the handle 7 are three switch rings b, a, d. The ring a has a set of contacts a<2> a<3>, for operating the soleniod A. The ring b has a set of contacts b<2>, b<3> &c. alternating with contacts c<2>, c<3> &c. The former set'is for solenoid B for unlocking the carriers, the latter set for solenoid B for the scissor levers 19, 20 for sliding the selectorshaft. The third ring d is for turning the selector shaft. The solenoids D, E have to be entrained alternatively for gearing up or down, and for this purpose switch contacts D<1>, E<1>, Figs. 8, and 11, are brought into action alternatively according to the direction of turning of the handle 7. This is done by cams 36 acting on a pin 37 upon a sliding yoke 38 whch supports the ends of the contacts D<1>, E'. In Fig 20 is shown alternative means for releasing the locking-bolts 13a - 13<c>, a parallel-motion bar 70 taking the place of the crank shaft 34 of Fig. 12. Specification 105,192 is also referred to.