| 摘要 |
661,188. Actuation of switches. BOSCH GES., R. 6, 1949. [Oct. 1, 1948] No. 352/49. Class 38 (v). A switch operated on the reversal of rotation of a rotary member 10, has a pair of axially-spaced but relatively-fixed pawls 15, 16 adapted so that when a striker carried by the rotary member engages one pawl and moves this pawl out of its path, the other pawl is moved into the path which the striker traverses when the direction of rotation of the member 10 is reversed. The striker is formed by a ball 32, a roller or the like which moves under its own inertia along a helical or part helical path formed by a tube 34 secured to the rotary shaft 10. The tube 34 has closed but slotted ends 35, 36 so that depending on the direction of rotation of the shaft 10, the ball 32 is moved to one end of the tube 34 to engage the appropriate pawl 15 or 16 to operate the switch. The tube is slotted so that the end not containing the ball may revolve freely past the other pawl when the latter has been moved down into the path of the tube by the engagement of the ball with the first pawl. The switch has fixed contacts 43, 44 engaging semi-circular contact members 41, 42 carried on a disc 40 secured to and moved by the pawls 15, 16. An overcentre snap-action spring 45 is fixed between the switch frame 50 and a bar 39 interconnecting the pawls 15, 16. The Specification as open to inspection under Sec. 91 describes and illustrates modifications in which (a) the striker is formed by an arm fixed to a sleeve axially movable on the shaft under the control of an inclined slot and pin connection ; (b) the striker is formed by an arm pivoted on an inclined shaft carried by a sleeve rigidly fixed to the shaft 10 ; and (e) the striker is formed by an eccentrically-pivoted, two-armed lever. This subject-matter does not appear in the Specification as accepted. |
