Touch contact
AssigneeSiemens Aktiengesellschaft
InventorsRolf Pfeifer, Jorn Wimmer
Life of this patent
Estimating the term…
Abstract
A manually actuatable sliding short-stroke switch is provided with a light conducting cap attached to the sliding piece and a touch surface above the cap. A means for illuminating the touch surface is provided, and the light conducting cap is covered on its surface with a layer impermeable to light except for a selected area of the touch surface and a light instance area for receiving light from the source. The light conducting cap and the touch surface provide a means for actuating the switch substantially unaffected by fatigue due to repeated use and which can be illuminated without transferring light to adjacent touch surfaces.
Claims2
A light conducting cap for use with a short stroke switch mounted beneath a control panel, said cap having
- a light transmissible touch surface;
- a laterally extending arm terminating in a downwardly extending portion having a receptacle at a bottom thereof;
- a light admissible surface forming a wall of said receptacle;
- an engagement area for engaging a movable actuator for said switch for co-action of said cap and said actuator;
- and
- an opaque outer surface to prevent external radiation when a light source received in said receptacle transmits light through said light admissible surface to said touch surface.
A touch contact comprising:
- a short stroke manually actuatable switch mounted beneath a control panel and having a vertically slidable actuator;
- a cap comprised of light conducting material mounted above said actuator for co-action therewith,
- said cap having a top which extends into an aperture in said control panel for guided vertical action above said switch and which terminates substantially co-planar with said panel,
- said cap having a light transmissible surface co-planar with said top,
- said cap having a laterally extending arm having a downwardly extending portion terminating in a receptacle for receiving said light source, and a light admissible surface forming a wall of said receptacle;
- a light source adjacent said light admissible surface for selectively illuminating said top of said cap.
Dependencies are inferred from the claim text.