Geometrical instruments – Area integrators – Electrical
Patent
1974-09-16
1976-01-27
Haroian, Harry N.
Geometrical instruments
Area integrators
Electrical
G01B 306
Patent
active
039343510
ABSTRACT:
A first embodiment of foldable measuring stick which is composed of three separate members, the intermediate member having a hollow chamber, an elastic means located within said hollow chamber and interconnected on opposite ends to the other members, the interconnection with the elastic means to each member being through a pair of links which are pivotally connected together, the three members to be interconnected in an in-line position and useable as a measuring stick, the outer members being movable to a position along side the intermediate member when the stick is not in use, locking means for locking the outer members to the intermediate member when in the along side position. A second embodiment of measuring stick can be constructed of only two members with a stop block mounted within one member, a bifurcated rod element passing through the stop block, a coil spring surrounding one of the legs of the bifurcated element biasing the element to retracted position, the element pivotally connected to a link which is also pivotally connected to the other member.
REFERENCES:
patent: 469592 (1892-02-01), Parkes
patent: 774365 (1904-11-01), Phenix
patent: 941492 (1909-11-01), Burns
patent: 2694931 (1954-11-01), Handley
patent: 2978217 (1961-04-01), Gunderson
Haroian Harry N.
Munro Jack C.
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