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Buckling spring

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Unicomp Model M with removed z key. The exposed buckling spring is visible.
IMB Model F (left) and Model M (right) keyboard springs
IBM M2 sound
The characteristic sound produced by the buckling-spring mechanisms of a Model M keyboard
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A buckling spring is a type of keyswitch mechanism, popularized by IBM's keyboards for the PC, PC/AT, 5250/3270 terminals, PS/2, and other systems. It was used by IBM's Model F keyboards (for instance the AT keyboard), and the more common Model M. It is described in U.S. patent 4,118,611 (Model F) and U.S. patent 4,528,431 (Model M), both now expired.

Operation

The coil spring tensed between the keycap and a pivoting hammer buckles (i.e. kinks or collapses) at a certain point in its downward traverse, providing auditory and tactile feedback to the keyboard operator. Upon buckling, the hammer is pivoted forward by the spring and strikes an electrical contact which registers the key press. In a Model M, the electrical contact is a membrane sheet similar to that of a modern dome switch keyboard.

  • Buckling spring on key press and release
    Buckling spring on key press and release
  • Illustration from the original buckling spring U.S. patent 4,118,611, issued to IBM in 1978
    Illustration from the original buckling spring U.S. patent 4,118,611, issued to IBM in 1978
  • A drawing included in the patent for the buckling spring mechanism
    A drawing included in the patent for the buckling spring mechanism
  • Graph of key force over key travel for a buckling spring key. Visible in graph position 1C the fast force drop when the spring buckles. U.S. patent 4,118,611, issued to IBM in 1978.
    Graph of key force over key travel for a buckling spring key. Visible in graph position 1C the fast force drop when the spring buckles. U.S. patent 4,118,611, issued to IBM in 1978.

See also

References

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