Measuring and/or tracing device

Details Measuring and/or tracing device Measuring and/or tracing device

1979-01-09

1981-08-11

Martin, Jr., William D.

Geometrical instruments

Miscellaneous

Light direction

33169R, 188 44, G01B 300

Patent

active

042826543

ABSTRACT:
A measuring and/or tracing device is of the kind having a vertical column, a transverse sliding unit secured to the column and movable in a vertical direction, a cross arm held by said unit and movable horizontally, a holder on the end of the said cross arm for a measuring and/or tracing tool, and a counterweight being disposed inside the column so that it can move freely and being attached to the transverse sliding unit by a cable passing over a guide roller at the upper end of the column. The improvement comprises a safety braking device attached to the transverse sliding unit and acting in conjunction with external surfaces of the column, to which braking device the cable is secured, and which in consequence of the cable tension exerted, is held in a disengaged position out of contact with the outer surfaces of the column, but which, when the cable tension falls, drops automatically into the braking position and engages by gripping rollers or balls with the outer surfaces of the column, thereby preventing movement.

REFERENCES:
patent: 604557 (1898-05-01), Baum
patent: 829534 (1906-08-01), Ludlow
patent: 2717663 (1955-09-01), Higgins
patent: 3273671 (1966-09-01), Vrana
patent: 3353275 (1967-11-01), Porath
patent: 3812589 (1974-05-01), Schultheis
patent: 4149317 (1979-04-01), Reiff et al.

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