Control device for drawing instruments
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United States of America Patent
Stats
-
Dec 11, 1984
Grant Date -
N/A
app pub date -
Jan 10, 1983
filing date -
Jan 11, 1982
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
This control device consists of a slider disposed within the portion of the hollow head which rotates with the rules; this slide is provided with a guide T-shaped and member is pivotally interconnected to a thumb-piece accessible from outside the head. The pivotal connection between the slider and the thumb-piece is constantly maintained through a coil compression spring prestressed between the inner wall of the head and a stud rigid with the slider opposite the pivotal connection. The thumb-piece comprises on its bottom a projection engageable in a cavity formed in the head base. The relative positions of the pivotal connecting means and the projection are so calculated that the spring generates a self-locking torque preventing any uncontrolled released of the mechanism.
First Claim
Family
International Classification(s)
Cited Art Landscape
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