Typing machine key action
AssigneeSCM Corporation
InventorsHans W. Mueller, Richard E. Shattuck
Life of this patent
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Abstract
An interposer in a typing machine key action is supported by an arcuate spring and a shelf. When a key lever bears against the arcuate spring to release the interposer from the shelf, the arcuate spring snaps the interposer against a pawl that engages a power roll to initiate a typing operation. Potential energy is restored to the arcuate spring as the key lever lifts the interposer back to rest position. The arcuate spring serves as a support and frictionless pivot for the interposer and biases the interposer against the shelf while providing energy to impel the interposer against the pawl.
Claims12
In a typing machine of the kind having means for actuating a typing machine operation, a power roll rotatably mounted in the typing machine for engagement by the actuating means to actuate the typing machine operation, a key lever movably mounted in the typing machine, an interposer, means for supporting the interposer, means for releasing the interposer relative to the supporting means upon depression of the key lever, and means for restoring the key lever to a rest position, in combination, the improvement comprising:
- a. means, connected between the interposer and a stationary portion of the typing machine, for biasing the interposer against the supporting means and after activation of the releasing means, against the actuating means to cause the actuating means to engage the power roll to actuate the typing machine operation;
- and
- b. means for restoring potential energy in the biasing means during return of the key lever to the rest position by the restoring means.
Dependencies are inferred from the claim text.