Apparatus for checking diametral dimensions of mechanical pieces

An apparatus for checking inside diameters of a mechanical piece, comprising

• support means,
• two arms movable with respect to the support means, each arm defining a free end,
• two reciprocally movable feelers, each cooperating with the free end of a relevant arm,
• transducer means for providing a signal depending on the mutual distance of the feelers, and
• protection means, for preventing the entry of foreign matter, including a resilient substantially tubular element,
• the feelers being rigidly fixed to and supported by the tubular element and defining outside contact surfaces for cooperating with the piece to be checked and inside reference surfaces for remaining in contact with said free ends of the arms, the tubular element being adapted to determine stable positioning and displacement of the feelers along a diametral direction of the mechanical piece.

An apparatus for checking inside diameters of a mechanical piece, comprising

• support means including an elongated portion,
• two arms movable with respect to the support means, each arm defining a free end housed in said elongated portion,
• two reciprocally movable feelers, each cooperating with the free end of a relevant arm,
• transducer means for providing a signal depending on the mutual distance of the feelers, and
• protection means, for preventing the entry of foreign matter, including
• a resilient substantially tubular element arranged at the outside of the elongated portion, the feelers being rigidly fixed to the tubular element and defining outside contact surfaces for cooperating with the piece to be checked and inside reference surfaces for remaining in contact with said free ends of the arms,
• a nosepiece fixed to an end of the elongated portion, the nosepiece being adjacent, in a longitudinal direction, with respect to the tubular element, and
• sealing means adapted for cooperating with said nosepiece and with said tubular element.

An apparatus for checking inside diameters of a mechanical piece, comprising

• support means,
• at least two reciprocally movable feelers for contacting the piece,
• transducer means for providing a signal depending on the mutual distance of the feelers, comprising at least two mutually movable element,
• protection means, for preventing the entry of foreign matter, including at least a resilient substantially tubular element, and
• transmission means arranged between the feelers and the transducer means and rigidly connecting said movable elements to the feelers,
• wherein the tubular element defines a longitudinal axis and a lateral surface, the feelers being rigidly fixed to the lateral surface, and is made out of a resilient lamina having substantially constant thickness, the material and the geometrical dimensions of the tubular element being chosen so as to have, substantially, stiffness with respect to axial and torsional stresses, resilient compliance in transversal radial direction, and resistance to impacts and wear at least three orders of magnitude greater than those of similar elements made of natural or synthetic rubber.

An apparatus for checking inside diameters of a mechanical piece, comprising

• support means,
• at least two reciprocally movable feelers for contacting the piece,
• transducer means for providing a signal depending on the mutual distance of the feelers, comprising at least two mutually movable elements,
• protection means, for preventing the entry of foreign matter, including at least a resilient substantially tubular element made of a lamina having substantially constant thickness, the tubular element having an end fixed to the support means and a free end, and a sealing gasket fixed to the free end of the tubular element, and
• transmission means arranged between the feelers and the transducer means and rigidly connecting said movable elements to the feelers,
• the transmission means comprising two resilient laminae fixed to the support means, the feelers being rigidly fixed to the tubular element and to the resilient laminae, the material and the geometrical dimensions of the tubular element being chosen so as to have, substantially, stiffness with respect to axial and torsional stresses, resilient compliance in transversal radial direction, and resistance to impacts and wear at least three orders of magnitude greater than those of similar elements made of natural or synthetic rubber.

An apparatus for checking inside diameters of a mechanical piece, comprising

• support means,
• at least two reciprocally movable feelers for contacting the piece,
• transducer means for providing a signal depending on the mutual distance of the feelers, comprising at least two mutually movable elements,
• protection means, for preventing the entry of foreign matter, including a resilient tubular element obtained by means of a pair of laminae bent in order to define two opposite semicylindrical parts, with longitudinal edges fixed to the support means, and
• transmission means arranged between the feelers and the transducer means and rigidly connecting said movable elements to the feelers,
• the transmission means comprising at least a pair of arms connected to the support means, movable mutually and with respect to the support means, and that define ends to which there are fixed, in a substantially rigid way, said at least two feelers, the feelers being also rigidly connected to the tubular element, the material and the geometrical dimensions of the tubular element being chosen so as to have, substantially, stiffness with respect to axial and torsional stresses, resilient compliance in transversal radial direction, and resistance to impacts and wear at least three orders of magnitude greater than those of similar elements made of natural or synthetic rubber.

An apparatus for checking inside diameters of a mechanical piece, comprising

• support means,
• at least two reciprocally movable feelers for contacting the piece,
• transducer means for providing a signal depending on the mutual distance of the feelers, comprising at least two mutually movable elements,
• protection means, for preventing the entry of foreign mater, including a resilient tubular element obtained by a lamina bent to a substantially cylindrical shape and having longitudinal edges fixed to the support means, and
• transmission means arranged between the feelers and the transducer means and rigidly connecting said movable elements to the feelers,
• the transmission means comprising at least a pair of arms connected to the support means, movable mutually and with respect to the support means, and that define ends to which there are fixed, in a substantially rigid way, said at least two feelers, the feelers being also rigidly fixed to the tubular element, the material and the geometrical dimensions of the tubular element being chosen so as to have, substantially, stiffness with respect to axial and torsional stresses, resilient compliance in transversal radial direction, and resistance to impacts and wear at least three orders of magnitude greater than those of similar elements made of natural or synthetic rubber.