Stackpole torsion spring

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Stackpole torsion spring

Manufacturer	Stackpole
Switch type	Linear
Switch mount	PCB mount
Patents	US3767878 (1972) US3924089 (1974) US4119821 (1977)

Stackpole torsion spring and formerly Stackpole discrete switch are provisional names for a family of low-profile cruciform-mount keyboard switches from Stackpole that use torsion springs for the movable contact. The torsion spring appears to allow for overtravel.

A patent for the switch was filed in 1972. A later patent was filed in 1974 which introduced a revision to the switch: the ends of the horizontal spring—used as a bridging electrical contact—were capped with conductive silicone rubber to provide for increased longevity.

Keyboards

• Some Atari 800 computers, used for the special keys on the right (not confirmed)

Gallery

Pictures of the Stackpole discreet key switches. These are odd in that these switches are oblong so there is a short side and a long side.

• 
  Overhead angled view
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  Long side with no spring or key cap
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  Short side with no spring or key cap
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  Long side with spring and key cap complete
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  Short side with spring and key cap complete
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  External parts
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  Bottom with Stackpole markings

External links

• TechDose — Fixing a Stackpole Momentary Keyboard / Key Pad Switch Dated 2012-05-24. Retrieved 2015-08-02.
• Deskthority - Keyboard mechanism with Stackpole discreet switches