| 摘要 |
A bistable device for representation of a point of a tactile information having an axially displaceable touch pin, an electromagnet moving the touch pin, and a lower permanent magnet located cooperatively adjacent the lower pole of the electromagnet and connected to a locking body for moving the locking body from an inoperative position into an operative position, permitting and blocking, respectively, displacement of the touch pin into its inoperative lowered position. A non-magnetic rod lengthens the touch pin and cooperates with the locking body at the rear. Between a touchable end of the touch pin and the adjacent front pole of the electromagnet, an upper permanent magnet is arranged on the touch pin and/or on the lengthening rod. The two poles of the permanent magnets which point to the poles of the electromagnet are alike. Alternately the locking body can be connected to the rear end of the rod, both being made of a non-retentive magnetizable material, and is separate from the lower permanent magnet cooperating therewith, without the necessity for the upper permanent magnet; the locking body is pivotable and axially shiftable onto two likewise staggered engagement planes, the lower permanent magnet being immoveable and defining a pole axis substantially perpendicular to the shifting direction.
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