| 摘要 |
1,213,233. Change-speed control. K. H. SCHMIDT. 11 April, 1968 [14 April, 1967], No. 17478/68. Addition to 1,111,246. Heading F2D. The gear changing mechanism described in the parent Specification is modified to prevent unintentional shift by maintaining the selected ratio relay 24, 25 or 26 energized for the period of the gear shift operation, determined by the time for which the delayed release relay 15 is energized. As shown in Fig. 1 the selector switch contact arm 31 is held in its selected position by a rotary member 29 formed with locking slots 30 and operated by a solenoid 33 energized by the relay 15. The member 29 is released, when the gear G is put into neutral, by a switch S which de-energizes the relay 15. In the form according to Fig. 2 the selector switch arm 43 is rendered ineffective by a change-over switch 41 which, when relay 15 is energized, cuts off connection with switch 43 and establishes connection with additional contacts 34, 35, 36 in the ratio relay circuits 24a, 25a, 26a. This arrangement enables the switch 43, during a gear change operation to be preset for a further gear shift to be initiated upon completion of the current gear change. |
