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US 4,109,118 AGranted
Keyswitch pad
OwnerVictor Kleyinventor
Life of this patent
Estimating the term…
Abstract
The keyswitch pad includes a plurality of keyswitches on a common backing member, each of the keyswitches including a fluid filled bag underneath a key cap. The bags of the keyswitches are interconnected and the system of bags is closed so as to be of limited volume so that only one keyswitch at a time can be depressed. Several different types of keyswitches can be used in any one switch pad and several types of switching, latching, and display mechanisms are disclosed for the keyswitches.
Claims38
A keyswitch comprising
- a backing member,
- a key cap spaced from but movable toward the backing member,
- switch contact means arranged between the backing member and the key cap and operated by movement of the key cap,
- a bag disposed between the key cap and the backing member,
- said bag having an upward extending portion annularly disposed and concentrically engaging the underneath side of the key cap, and
- a fluid filling the bag and having a pressure urging the key cap to a raised position.
3 more elements
A keyswitch pad comprising
- a backing member
- at least two keyswitches mounted on the backing member,
- a key cap in each keyswitch spaced from the backing member,
- switch contact means in each keyswitch actuated by depression of the key cap,
- a bag in each keyswitch disposed between the key cap and the backing member,
- said bags having respective upward extending portions annularly disposed and concentrically engaging the underneath sides of the respective key caps,
- a fluid filling the bags and having a pressure to urge at least one of the key caps to a raised position, and
- a coupling tube connecting the bags of each adjacent pair of the keyswitches so that the bags are in fluid communication with each other.
5 more elements
Dependencies are inferred from the claim text.