| 摘要 |
1,099,603. Direction indicator switches for road vehicles. ESSEX WIRE CORPORATION. May 3, 1966 [Oct. 24, 1965], No. 19583/66. Heading G4Q. An operating mechanism for a turn indicator switch comprises a fixed member A to which a movable member B is pivoted. The member B is biased by a spring 43 towards the central position and carries at its ends pivots 28 which extend through slotted openings 34 in pawls 32. When the member B is rotated into an operative position the lug 36 on one of the pawls 32 engages in a detent notch 38 in member A to hold the switch on. When the steering column 14 is rotated to make the turn, cam lobes 46 and 48 move the pawl 32 against its retaining spring 40 or 42 (Fig. 8, not shown), and the lug 36 remains engaged in the notch 38; on return movement of the steering column the cam lobes rotate the pawl 32 and allow the switch to return to the neutral position under the influence of spring 43 unless the switch is held in the on position (Fig. 9, not shown). The cam 44 may be rotatably secured to the member A by spring fingers 50 (Fig. 3, not shown) and rotated by a cam driver D which is sprung on to the steering column 14 and which is provided with a projection 58 engaging a slot 60 in the cam. Alternatively, Figs. 11 and 12 (not shown), the cam may be driven by a pin (64) projecting downwards from the hub of a steering wheel and entering a notch (68) in the cam. |
