Self-extending rule

Details Self-extending rule Self-extending rule

1979-02-08

1980-05-06

Haroian, Harry N.

Geometrical instruments

Area integrators

Electrical

242 848, G01B 302, B65H 7516

Patent

active

042009839

ABSTRACT:
An improved case for a self-extending rule having a resilient blade which assumes a straight position when in a relaxed state and has a pair of case sections formed with flat top, bottom, and back walls, and arcuate side walls enclosing a cylindrical interior chamber and with a front wall having a generally arcuate opening in a lower sector thereof defined by the rim of the adjacent side wall and the edge of a reentrant web extending from the opposite side wall. The underside of the web has a center post extending into the chamber to mount a cylindrical cup for nesting the convolutions of the blade when inserted endwise through said arcuate opening and underneath the edge of the web. A brake is mounted for rectilinear movement in a radial opening in the top wall of the case adjacent the front side of the cup and is biased into engagement with a converging open rim of the cup. The back of the case is spaced from the bottom of the cup and forms an annular chamber in which pivotal weights are mounted to rotate with the cup and engage the annular wall of the chamber for limiting the speed of rotation of the cup.

REFERENCES:
patent: 3228626 (1966-01-01), Quenot
patent: 4155168 (1979-05-01), DuBois

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