HANDHELD MEASURING INSTRUMENT WITH MULTIPLE CONTROLS OPERABLE BY THE HOLDING HAND
First Claim
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1. A handheld thermocouple pyrometer, comprising:
- a. a casing and a handle supporting said casing;
b. a temperature-calibrated scale on the face of said casing;
c. terminal means for connecting the output of a thermocouple to said pyrometer;
d. a slide wire potentiometer in said casing, electrically connected to measure the output potential of said thermocouple, said potentiometer having a rotatable arm and a fiduciary pointer rotatable therewith, said pointer overlying said scale, the axis of rotation of said arm and pointer being transverse to the plane of said scale;
e. a galvanometer in said casing electrically connected to said potentiometer to indicate the balance thereof, said galvanometer having a current-indicating pointer overlying said scale, said galvanometer body being movable with respect to said scale by rotation about the said axis of rotation for said potentiometer arm and fiduciary pointer whereby said rotation effects translation of said current-indicating pointer across said scale; and
f. potentiometer arm adjustment means for adjusting the balance of said potentiometer, said means being rigidly connected to said potentiometer arm and said galvanometer body, whereby said galvanometer body and said arm are rotated together, whereby balancing of said potentiometer may be indicated by coincidence of said fiduciary pointer with said galvanometer pointer over said scale.
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Abstract
A hand-grasped measuring instrument having a plurality of controls all of which are separately and selectively operable by the fingers and thumb of the hand grasping the instrument.
7 Citations
6 Claims
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1. A handheld thermocouple pyrometer, comprising:
- a. a casing and a handle supporting said casing;
b. a temperature-calibrated scale on the face of said casing;
c. terminal means for connecting the output of a thermocouple to said pyrometer;
d. a slide wire potentiometer in said casing, electrically connected to measure the output potential of said thermocouple, said potentiometer having a rotatable arm and a fiduciary pointer rotatable therewith, said pointer overlying said scale, the axis of rotation of said arm and pointer being transverse to the plane of said scale;
e. a galvanometer in said casing electrically connected to said potentiometer to indicate the balance thereof, said galvanometer having a current-indicating pointer overlying said scale, said galvanometer body being movable with respect to said scale by rotation about the said axis of rotation for said potentiometer arm and fiduciary pointer whereby said rotation effects translation of said current-indicating pointer across said scale; and
f. potentiometer arm adjustment means for adjusting the balance of said potentiometer, said means being rigidly connected to said potentiometer arm and said galvanometer body, whereby said galvanometer body and said arm are rotated together, whereby balancing of said potentiometer may be indicated by coincidence of said fiduciary pointer with said galvanometer pointer over said scale.
- a. a casing and a handle supporting said casing;
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2. Apparatus according to claim 1, further including switching means for activating said potentiometer and connecting the output of said thermocouple thereto.
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3. Apparatus according to claim 2, further including range-changing means for interchanging resistors in said casing, thereby changing the measurement range of said pyrometer.
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4. Apparatus according to claim 3, wherein said potentiometer arm adjustment means, said switching means, and said range-changing means are external to said casing and are all within reach of the fingers and thumb of a hand grasping said handle.
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5. Apparatus according to claim 4, wherein said potentiometer arm adjustment means is a disc at the lower central portion of the front of said casing, said switching means is a multiple switch at the upper portion of the handle, at the back thereof, and said range changing means is a knob located on the bottom wall of the casing adjacent the handle.
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6. Apparatus according to claim 4, wherein the face of said casing bearing said scale forms a fixed angle of less than 180* with the axis of said handle, whereby reading of said scale is facilitated.
Specification