Geometrical instruments – Straightedge type – Base attached
Patent
1985-01-09
1986-07-22
Stearns, Richard R.
Geometrical instruments
Straightedge type
Base attached
B43L 1302
Patent
active
046011072
ABSTRACT:
A scale balancing device for use in a universal parallel ruler device having a head, a spindle rotatably supported on a non-rotating part of the head, a scale mounting plate fixed to the lower spindle, a handle fixed to the upper spindle, and scales mounted on the scale mounting plate, the device has a first gear coaxially mounted on the spindle for rotation therewith, the weight of the scales exerting a torque on the first gear, a second gear rotatably mounted on a non-rotating part of the head and having a spring connected thereto for applying a torque to the second gear to rotate the second gear in a predetermined rotating direction, and a two-stage intermediate gear having a small gear and a large gear integrally connected and rotatably supported on a non-rotating part of the head, the second gear being in mesh with the small gear and the large gear being in mesh with the first gear, the ratio of the diameter of the first gear to the diameter of the large gear being substantially the same as the ratio of the diameter of the second gear to the diameter of the small gear, and the direction in which the torque is exerted on the first gear due to the weight of the scales being transmitted through the two-stage gear and exerted on the second gear in a direction opposite the predetermined direction and being substantially cancelled out by the torque on the second gear due to the spring.
REFERENCES:
patent: 3871101 (1975-03-01), Becattini et al.
patent: 4070758 (1978-01-01), Watanabe
patent: 4495708 (1985-01-01), Jopt et al.
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