| 摘要 |
1,223,019. Gearing. ILLINOIS TOOL WORKS Inc. 22 Nov., 1968 [24 Nov., 1967], No. 55579/68. Headings F2K and F2Q. [Also in Division Hi] An alternate action mechanism comprises an outwardly biased depressor 24, a multi-lobed cam 30 rotatably mounted in the mechanism, a lever arm 40 pivoted (e.g. by hooks 36) and following the cam (e.g. to control a push button switch 10) means (e.g. a flexible pawl 50 and a ratchet 32) to rotate the cam by incremental steps on each depression of the depressor, successive steps moving the lever alternately between a depressed position, activating the switch, and a relaxed position, there being a notch 43a in each lobe 42a of the cam to hold the lever depressed as the depressor is released. The mechanism may comprise two switches 10 side by side between which are sandwiched part of a housing (14), Fig. 1 (not shown), for the mechanism, the lever 40 being of square U-form pivoted at its base, each arm activating one switch 16 but only one arm following the cam 30. The depressor 24 may be hollow and house a lamp (18) the terminals for which depend from the housing with those of the switches 10. |
