Patent GB-665863-A (GB)
Title: Improvements in or relating to cross-bar switches for automatic telephone systems
IPC: H01H67/26
Filed: 1949-03-02
Abstract: 665,863. Automatic exchange switches. NAAMLOOZE VENNOOTSCHAP PHILIPS' GLOEILAMPENFABRIEKEN. March 2, 1949 [March 5, I948], No. 6717/49. Class 40 (iv). In a cross-bar switch, the actuating bars drive the contact-actuating devices through resilient couplings, and each selector bar is provided with detents individual to the associated actuating devices and adapted to block or allow the movement thereof according as the selector bar is in its rest position or in its operative position. As shown, Figs. 1, 2, each contact set 39 has a corresponding actuating device 51 ... 56 comprising a finger 41 projecting from a sleeve 40 rotatably mounted between two collars 42, 43 secured to an actuating bar 29 ... 34. A leaf-spring 45 has one end embedded in the collar 42 while its free end rests between two pins 46 projecting from the finger 41. A projection 47 on the sleeve 40 normally engages a cam 48 on a selector bar 21 ... 26 and prevents rotation of the sleeve 40 and finger 41 even when the corresponding actuating bar is rotated to its operative position by its actuating magnet 38, as at 52, the leaf spring 45 being flexed in this case. Operation of a selector magnet 37 rotates its associated selector bar which moves its cams 48 out of engagement with the projections 47, as at 53, so that one sleeve 40 on an operative actuating bar is moved by its spring 45 to the operative position 54 and its finger 41 closes the associated contact set 39. On release of the operated selector magnet 37 the associated selector bar is returned by spring means (not shown) to its rest position and holds the operative sleeve 40 and finger 41 in the operative position 55. The energized actuating magnet 38 may now be released, allowing its associated actuating bar to return under the action of spring means (not shown) to its rest position 56. The established connection is maintained until the corresponding selector magnet 37 is briefly energized to release the operative sleeve 40 and finger 41 which are returned to normal by the associated spring 45. The Specification as open to inspection under Sect. 91 comprises also an alternative construction of switch, Fig. 1 (Cancelled). Each actuating magnet 6 has a hooked armature 8 which it can pull up against the action of a spring 10 and each selector magnet (not shown) can pull a selector bar 13 in opposition to a spring 14, carrying with it a number of resilient members 11 whose lower ends are bent at rightangles to pass through slots 12 in contactoperating members 1 on which their upper ends are secured. On the energization of an actuating magnet 6 followed by a selector magnet, the lower end of one resilient member 11 moves beneath one armature 8. When the magnets are released in the same order, the associated contact-operating member 1 is pulled down against a spring 4 and closes its contacts 5, the connection being maintained until it is released by momentary energization of the relevant actuating magnet 6. This subject-matter does not appear in the Specification as accepted.