| 摘要 |
782,227. Keyboard switches. PHILIPS ELECTRICAL INDUSTRIES, Ltd. Sept. 7, 1955 [Sept. 10, 1954], No. 25637/55. Class 38 (5). [Also in Group XXXVIII] A switching device comprises individual switches, some of which are controlled by parallel sliding rods, there being provided a separate switch which controls a sliding rod for locking the first-mentioned switches in certain positions, the locking rod being arranged transversely to the direction of movement of the parallel rods, the latter and the locking rod having cooperating recesses therein. As applied to a magnetic recorder, buttons 1 and 2 respectively control the rapid reverse and forward coiling of the sound carrier, buttons 3 and 4 respectively control the reproduction and recording, and a rotary knob 5 controls the normal movement of the sound carrier. Each button has a rod 8 slidable in a frame 6 and having a notch 9 co-operating with the frame to lock the buttons in their depressed positions. Buttons 1, 2 also have notches 11 co-operable with a sliding rod 14 connected to the knob 5 by a link 13. The rod 14 has notches 19 and a pivoted lever 21 lying across the notches 19, so that when notches 11 and 19 coincide, depression of e.g. button 1 causes a sloping surface thereon to tilt the lever 21 counterclockwise into notch 11 of button 2 which is thereby locked. The rod 8 of button 1 also enters the right-hand notch 19 and locks the rod 14. An extension of the rod 14 (Figs. 8, 9, not shown), or a lever 16 pivoted thereon, co-operates with the rods 8 of buttons 3 and 4 so that when knob 5 has been operated buttons 3 and 4 cannot be depressed. In addition, if button 3 or 4 is depressed and knob 5 is then operated, the said button is locked down and the other prevented from operation. |
