Linear measuring apparatus

Details Linear measuring apparatus Linear measuring apparatus

1987-11-12

1988-08-02

Haroian, Harry N.

Geometrical instruments

Area integrators

Electrical

G01B 702

Patent

active

047606479

ABSTRACT:
A hand-held linear measuring device is enclosed within an elongated housing which has a handle at one end and an opening at the opposite end. A wheel mounted on the housing and protruding through the opening rotates as it engages and is drawn across a surface to be measured. As the wheel is rotated, it rotates a selector disk about a parallel axis. A plurality of radially extending elongated slots are formed in the selector disk at equally spaced azimuthal locations. A contact member extends transversely through each slot and is selectively, releasably, fastened thereto at one of a plurality of predetermined radial positions. As the selector disk rotates, it causes the contact members to successively engage an electrically conductive resilient whisker member extending across the path of their advance. Electrical pulses are thereby generated and are received by a counter which sums them up, then displays a value equivalent to the distance traveled by the wheel and in the particular unit of measurement selected by the user to be displayed by the counter.

REFERENCES:
patent: 1718052 (1929-06-01), Lineaweaver
patent: 2557450 (1951-06-01), Mentzel
patent: 3293760 (1966-12-01), Weller
patent: 3436954 (1969-04-01), Eppler
patent: 3497957 (1970-03-01), Jorgensen
patent: 3656239 (1972-04-01), Hutchinsen et al.
patent: 3700164 (1972-10-01), Slagle
patent: 3790761 (1974-02-01), Crabtree
patent: 4700484 (1987-10-01), Frank

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