Self-locking telescopic extensible rule

Details Self-locking telescopic extensible rule Self-locking telescopic extensible rule

1978-05-31

1980-01-01

Stearns, Richard R.

Geometrical instruments

Area integrators

Electrical

G01B 308

Patent

active

041809149

ABSTRACT:
A length-measuring instrument having at least two tubes which are telescopically extensible. Each of the tubes is provided with a scale graduation arranged so that the scale graduation on an inner tube proceeds numerically in a direction opposite to the scale graduation on an outer one of the tubes. A fixing device acts in any position of the tubes and functions as an automatic clamp having two spring-loaded clamping pins passing through the outer one of the tubes and arranged in an inclined position. These clamping pins rest in each fixed position of the tubes, against an upper side of the inner tube carrying the scale graduation. The clamping effect may be released only by applying external force to the clamp.

REFERENCES:
patent: 224401 (1880-02-01), Derickson
patent: 2740201 (1956-04-01), Swanson
patent: 3104477 (1963-09-01), Edwill
patent: 3261102 (1966-07-01), Stedman
patent: 3492737 (1970-02-01), Swanson

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