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US Patent: 1,597,636
Measuring Instrument for Gear Wheel Teeth
William Edward Sykes - Slough, England

USPTO Classifications:

Tool Categories:
metalworking tools : machinist tools : measuring tools


Not known to have been produced

none listed

Patent Dates:
Applied: Aug. 09, 1921
Granted: Aug. 24, 1926

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Application filed August 9, 1921, Serial No. 490,978, and in Great Britain September 20, 1920.

For measuring the thickness of gear wheel teeth instruments having a vernier scale are generally used, but in certain classes of precision work more precise readings are required. The object of the present invention is to provide an instrument whereby more precise measurements may be made with equal or greater facility than is possible by means of a vernier gauge. According to the present invention I provide a form of caliper gauge consisting of a beam on which are mounted two jaws. . One or both jaws is or are arranged slidable and adjustable in such a manner that the distance of the inside faces may be varied to suit teeth of various pitches. The inside faces of the said jaws are arranged at an angle to each other. I further mount on the aforementioned beam a test indicator which may be of any, known or convenient form, but I prefer to employ the type having a circular dial known as a dial test indicator. The test indicator is mounted on the beam in a manner that the plunger or contact spindle may operate between the inside angular faces of the jaws, and by this arrangement the contact point of the indicator is adapted to make contact with the top of the tooth being measured when the inside angular faces of the jaws, make contact with the sides or flanks of the same tooth. In order to obtain measurements with the instrument made as already described it is necessary to provide means whereby the zero position of the test indicator may be adjusted relative-to the width apart of the jaws or alternatively means whereby the width apart of the jaws may be adjusted relative to the test indicator. To accomplish this I preferably arrange one jaw slidable on the beam and adjustable by means of a nut turning on a fine pitch screw. To obtain definite and precise settings of the instrument I preferably employ gauge blocks each representing a rack tooth of any particular pitch.

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