Scale balancing device in universal parallel ruler device

Details Scale balancing device in universal parallel ruler device Scale balancing device in universal parallel ruler device

1985-01-09

1986-05-13

Little, Willis

Geometrical instruments

Straightedge type

Base attached

33440, B43L 1302

Patent

active

045877424

ABSTRACT:
A scale balancing device for balancing the weight of the scales of a universal parallel ruler, the device having a head structure having the scales rotatably mounted thereon, a rotating member rotatably mounted on the head structure separate from the scales, the rotating member and the rotatable scales being rotatably interlocked, and a spring having one end rotatably connected to a point on the rotating member eccentric to the axis of rotation thereof and the other end rotatably connected to a non-rotatable part of the head structure, the spring, when the scales are rotated to a position vertically in line with the axis of rotation thereof, having substantially no tension therein and when the scales are rotated ninety degrees from such position, having tension for exerting a maximum force on the eccentric connection point on the rotating member and sufficient in magnitude and having a direction which substantially cancels out the torque on the rotating member from the weight of the scales.

REFERENCES:
patent: 4070758 (1978-01-01), Watanabe

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