Geometrical instruments – Straightedge type – Base attached
Patent
1983-02-23
1984-12-11
Stearns, Richard R.
Geometrical instruments
Straightedge type
Base attached
33 1D, B43L 1302
Patent
active
044869584
ABSTRACT:
A drawing head has a base plate which has a central bore and which is rotbly mounted on a drawing machine. A straightedge support assembly includes a straightedge support mounted on a rotatable pin in the central bore. A cover plate is nonrotatably mounted on the pin and supports a gripping knob. A spacing ring is rotatably mounted about the central axis between the base plate and the cover plate. Normal side locking means serve to releasably retain the straightedge support assembly with respect to the spacing ring, and base side locking means serve to releasably retain the spacing ring with respect to the base plate. Each of the locking means has a locking pawl which is pivotally positioned about an axis parallel to the central axis of rotation without play by means of a pivot jaw assembly and which engages and disengages a spring-loaded locking tooth against a locking disc secured with respect to the spacing ring. In order to avoid subjecting the straightedge support to stress moments perpendicular to the axis of rotation, the locking pawls are mounted in a recess formed in a portion of the straightedge support assembly or in the base plate radially adjacent to the proper locking disc and the pivot pin of the pivot jaw assembly extends radially into the pivot jaw.
Franz Kuhlmann Prazisionsmechanik und Maschinenbau GmbH & Co. KG
Stearns Richard R.
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