Spindle-height gage and method of calibration
OwnerErwin W. Graham, Wayne B. Grahaminventors
Life of this patent
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Abstract
A spindle-height gage is provided for measuring the height of one or more spindles in a tape recorder. The gage includes a pair of indicators rigidly mounted to a stable base configured for insertion into the tape recorder in lieu of a cassette. Upon insertion of the base plate into the recorder, the spindle under test comes into contact with a "foot" extending from a shaft of one of the indicators, which then provides indication of the spindle height. The gage is calibrated by inserting into the gage a calibrating disc having two shoulders, each of a height corresponding to the specified height of one of the spindles.
Claims11
A gage for measuring the height of a spindle in a cassette tape recorder, comprising:
- a base configured for insertion into said tape recorder, said base having a spindle opening therein into which said spindle protrudes when said gage is inserted into said tape recorder;
- a dial indicator having a bottom section rigidly mounted to said base, a top section which is free to rotate about a central axis, and a pointer;
- a shaft extending from said indicator into said spindle opening in said base, the angular displacement of said pointer of said indicator being responsive to motion of said shaft;
- a foot extending into said spindle opening so that said spindle will come into contact with and cause linear displacement of said foot, said foot acting upon said shaft, causing angular displacement of said pointer to indicate the height of said spindle;
- and
- a stop screw mounted to the base adjacent to the dial indicator to permit rotation of said top section during calibration of said gage, but to prevent rotation of said top section at other times.
A method of calibrating a gage having (1) a base configured for insertion into a tape recorder, said base having a pair of spindle openings therein into each of which a spindle protrudes when said gage is inserted into said tape recorder;
- (2) a pair of indicators mounted on said base;
- (3) a pair of shafts, each extending from one of said indicators into the associated spindle opening in said base;
- and (4) a pair of feet, each associated with and acting upon one of said shafts, said feet extending into said spindle openings so that said spindles will come into contact with and cause a linear displacement of its associated foot, causing an indication of the heights of said spindles to appear on said indicators;
- said method comprising the steps of:
- (a) inserting into one of said spindle openings a calibrating disc having a shoulder of predetermined height;
- (b) adjusting said indicator to show a reading reflecting said predetermined height;
- and
- (c) repeating steps (a) and (b) for the other spindle opening in said base.
Dependencies are inferred from the claim text.