Device for indicating the maximum reading of a measuring instrum

Details Device for indicating the maximum reading of a measuring instrum Device for indicating the maximum reading of a measuring instrum

1978-10-05

1980-04-08

Yasich, Daniel M.

Signals and indicators

Indicators

Rotary indicator with actuating means

73300, 73709, G01D 1324, G01F 2314

Patent

active

041966902

ABSTRACT:
A device for indicating the maximum reading of a measuring instrument of the type having a needle turnable over a dial marked with a graduated scale extending for more than 360.degree. includes an auxiliary needle mounted on a pivot pin carried by a transparent screen covering the dial and lightly frictionally engaged with this pin so that it can be turned, for zero setting, by rotation of the pin by means of a knob attached to the outer end thereof. The auxiliary needle is provided with engagement means by which it is engaged by the main needle upon advancing movement, but which allows the main needle to pass the auxiliary needle should it require to do so, having reached a maximum position more than 360.degree. from the zero of the scale so that, upon returning to zero, it passes the auxiliary needle which remains fixed at the maximum position reached. The engagement means comprises a resilient latch including a leaf spring engaged by the main needle in its advancing movement, but resiliently deflected by the main needle as it passes the auxiliary needle in its return movement.

REFERENCES:
patent: 925814 (1909-06-01), Jones
patent: 1755184 (1930-04-01), Martinet
patent: 2706962 (1955-04-01), Kobbon
patent: 3257794 (1966-06-01), Bennett et al.
patent: 3703838 (1972-11-01), Tsuruishi
patent: 3796101 (1974-03-01), Howard

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