| 摘要 |
1490359 Retractive switches; switch handles LA TELEMECANIQUE ELECTRIQUE 16 Dec 1974 [26 Dec 1973] 54218/74 Heading H1N Apparatus for operating electric switch contacts comprises two pivotable devices 13, 14 whose pivot axes XX<SP>1</SP>, YY<SP>1</SP> are perpendicular to each other, a switch operating member 7 rotatably mounted on one 13 of the devices and permanently engaging a circular portion 20 of the other 14, a lever 31 pivotable about the pivot axis YY<SP>1</SP> of one 14 of the pivotable devices and having at its free end a resiliently loaded element 37 abutting a concave guide 33, means 47 on the one pivotable device 14 for moving the lever 31 and a spring 45 for returning the lever 31 to a rest position in which the resiliently loaded element 37 rests in a central notch 48 in the guide 33. One end of an operating handle 7 is received in an aperture 20 of a U-shaped pivotable device 14, connected to cams 26 for operating switch contacts 36, to enable the device 14 to be pivoted about an axis YY<SP>1</SP> by the handle 7. A second pivotable device carrying cams 30 for operating another group of contacts is pivotable by the handle 7 about an axis XX<SP>1</SP> perpendicular to the axis YY<SP>1</SP>. Each device 13, 14 is returnable to its inoperative position by one of two levers 31, 32 (depending on the direction of movement of the device 13, 14), one end of each of which lever is mounted on the journal pin 15, 16 of its associated device 13, 14 and the other end carries a roller 37, 38 biased by a spring 39 into engagement with a curved plate 33, 34, 35. The plates 33, 34, 35 each have a notch 48 serving as a stop for the roller 37, 38 in the inoperative position and may have an undulating surface (plate 35 in Fig. 1). The end of each lever 31, 32 is connected to a return spring 45 which makes an angleαof 45 degrees therewith so that when one of the devices 13, 14 is pivoted in one or the other direction by the handle 7, one or the other of the levers 31, 32 is moved against the spring bias 45 by a projection 29 or 47 on the device 13, 14. |
