Displacement measuring instrument
First Claim
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1. A displacement measuring instrument, comprising:
- a case body;
a movable member displaceably secured to said case body and capable of abutting at one end thereof against a workpiece to be measured, said movable member having a rotatably supported roller on the other end thereof;
a rotatable shaft mounted on said case body;
a cam supported on said shaft and rotatable therewith, said cam having an Archimedean spiral surface at the periphery thereof, against which said roller is rotatably engaged;
a rotator secured to said shaft and being concentrically oriented with said cam;
a rotatable follower member engageable with said rotator, said cam, said rotator and said follower member being arranged such that said follower member makes two or more revolutions per one revolution of said cam; and
indicating means for indicating a displacement value of said movable member in response to a rotation of said follower member.
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Abstract
A displacement measuring instrument wherein a cam (9) is engaged with a movable member such as a spindle (5), a rectilinear movement of the spindle (5) is converted into a rotary motion of the cam (9), the rotary motion of this cam (9) is enlarged and transmitted to a follower through a rotator (20) rotatable in synchronism with the cam (9), an indicating device (32) is driven due to rotation of the follower (21) for indicating a displacement value of the spindle (5). Component parts are small in number and construction is simplified.
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Citations
9 Claims
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1. A displacement measuring instrument, comprising:
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a case body; a movable member displaceably secured to said case body and capable of abutting at one end thereof against a workpiece to be measured, said movable member having a rotatably supported roller on the other end thereof; a rotatable shaft mounted on said case body; a cam supported on said shaft and rotatable therewith, said cam having an Archimedean spiral surface at the periphery thereof, against which said roller is rotatably engaged; a rotator secured to said shaft and being concentrically oriented with said cam; a rotatable follower member engageable with said rotator, said cam, said rotator and said follower member being arranged such that said follower member makes two or more revolutions per one revolution of said cam; and indicating means for indicating a displacement value of said movable member in response to a rotation of said follower member. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification