Direct feeling gage for the measurement of the sizes of moving workpieces, in particular for measurements with intermittent contact between the feeling means and the workpiece

Gage for the measurement of the sizes of moving workpieces comprising:

• an outer casing defining an internal chamber and at least first, second and third passage surfaces connecting the internal chamber with the space outside the casing;
• support means located in said chamber and fixed to the casing;
• two movable arms pivotally supported by said support means, each arm including a first section located in said chamber and a second section projecting outside said casing through said first and second passage surfaces, respectively;
• two feelers fixed to the sections of the arms projecting outside the chamber, for contacting the workpieces to be measured;
• measuring transducer means coupled to the arms, said transducer means including mobile elements fixed to the first sections of the arms;
• supply and detecting means for said transducer means;
• connecting means for connecting the transducer means to the supply and detecting means, said connecting means passing through the third passage surfaces;
• first means for sealing said first and second passage surfaces while permitting the pivotal movements of said arms;
• second means for sealing said third passage surfaces;
• a viscous fluid filling said internal chamber for providing a damping effect on the movements of the movable arms to permit the measurement of workpieces having discontinuous surfaces and measurements involving an intermittent contact between said feelers and the workpieces;
• and wherein said first sections of the movable arms and said mobile elements of the transducer means have large facing surfaces so as to displace, upon the movements of the arms, a sufficient quantity of fluid to obtain, by the cooperation with the fluid, substantially due to paddling action, said damping effect.

A gage for the measurement of internal diameters of workpieces being machined on internal grinding machines, comprising:

• an outer casing defining an internal chamber, said casing including a cylindrical shell, a front plate fixed to the shell and a rear cap fixed to the shell, the front plate defining two openings and the rear cap defining passage surfaces, said openings and passage surfaces connecting said chamber with the outside of said casing;
• support means located in said chamber and fixed to the casing;
• two measuring arms pivotally mounted on said support means, each arm including a first section and a second section, the first sections being located in said chamber and the second sections projecting outside said casing through said openings;
• two feelers fixed to said second sections, respectively;
• a measuring transducer including two elements fixed to said first sections, respectively;
• supply and detecting means for said transducer;
• connecting wires for connecting the transducer with the supply and detecting means, said connecting wires passing through said passage surfaces;
• gasket means for sealing said openings while permitting movements of said arms;
• sealing means for sealing said passage surfaces;
• a viscous fluid filling said internal chamber;
• and a protecting, yielding membrane fixed to the casing and located before the front plate to mechanically protect said gasket means and wherein said first sections and said two elements define large facing surfaces for displacing, upon pivotal movement of the arms, a volume of viscous fluid sufficient to obtain, substantially through a paddling action, a damping effect on the arm movements occurring in the measurement of workpieces having discontinuous surfaces and in measurements involving an intermittent contact between said feelers and the workpieces.