Abstract: The invention relates to a dial measurement gauge, which comprises a drive rack with a transmission multiplier mechanism connected to a movable pointer of its dial, a depth feeler gauge movable along and opposite the toothing of the rack, and a device for the protection of the said toothing. The gauge is characterized by the fact that the rack is formed by the rigid assembly of two profiled members, one of which comprises the toothing and the other covers the exposed side of the said toothing at least over its entire length and bears, with free sliding motion, against the depth feeler gauge located opposite it.

Abstract: A hand-held interior gauge for measuring a bore includes a body provided with a measuring head capable of being introduced into the bore, and a measuring transducer connected to a movable feeler and adapted to produce output signals representative of the displacement of the movable feeler. The gauge also includes a mechanism for immobilizing the measuring head while in the bore, such that the feeler is movable angularly and radially in a surface limited by a circumference contained in a plane perpendicular to the axis of revolution of the bore, once the measuring head is immobilized. A driving mechanism forming a portion of the interior gauge coordinates the angular and radial movement of the movable feeler, and the output signals from the feeler are provided to a calculator which, in turn, provides intelligence information to an automatic display device for displaying the diameter of the bore.

Abstract: In a precision dial measuring instrument having a coil-spring shock-absorbing movable unit provided between a pinion and a coaxial gear wheel of the transmission step-up mechanism arranged between the movable indicating member and the feeler of the instrument, the transmission step-up mechanism further includes a system for taking up of play by preliminary elastic stress of its train gear wheels.

Abstract: A shock absorbing device for use in dial measuring instruments comprising a balance lever interposed between a pinion and a coaxial toothed wheel of the multiplier mechanism disposed between the movable indicator member and the movable feeler of the instrument, said balance lever being pivoted on the common axis of said pinion and toothed wheel and intercepting during its pivotal movement in one and the same direction a first radial driving finger integral with an arm connected to the pinion and a second radial driving finger integral with said toothed wheel, a resilient liaison being formed between the balance lever and the radial driving fingers by the opposed action of the ends of at least a spiral spring connected at its inner end to said balance lever.

Abstract: An adjustable fork gauge including a main body having a slide on which a first, fixed jaw is slidably and adjustably mounted and formed from a block having an anvil with a plane face integral with said block; a second, spring clamping jaw adapted to press a plane or cylindrical portion of a part to be measured on the anvil of the fixed jaw; a feeler rod for the part to be measured including a contact adapted to emerge from the clamping jaw and displaceably mounted for translation in a bearing of the body such tha the axis of said feeler rod is perpendicular to the plane of the anvil of the fixed jaw; and a measuring or indicating transducer coupled to the body and having a movable element connected to the feeler rod.

Abstract: In a micrometer head for an instrument for measuring internal dimensions there is included a casing in which at least one measurement contact piece having an inclined base is radially mounted in a slot or groove. The contact piece is driven by the axial displacement of a measuring cone and is maintained in contact with the inclined lateral surface of the cone by means of a return member. The axial displacement of the measuring cone, the base of which is guided in an axial cylindrical recess of the casing, is effected by the thrust of a spindle which has a micrometer screw mounted thereon, the screw being engaged in a threaded member connected to the casing. The cone and spindle have coaxial axes of rotation, and the cone, spindle and micrometer screw are so arranged that the path of movement of the inclined base of the contact piece on the cone is in the form of a tapered ramp having a long length and shallow inclination, the movement being caused by the combined axial and rotational movement of the cone.

Abstract: A measurement instrument in the form of a plug gage comprises a tubular body within which there is centered an axially movable rod, one end of which is intended to transmit the axial movements of said rod to a transducer system connected to the tubular body, while the other end thereof bears a conical part coaxial with said rod, with the lateral surfaces of the conical part resting against radially movable feeler balls, each of which is housed in a guide channel transverse to the longitudinal axis of the tubular body. The plug gage is characterized in that the tubular body bears over at least a portion of its length a coaxial centering sleeve which is removable and interchangeable, this sleeve being provided with transverse openings intended to permit the passage of the balls.

Abstract: A centering and measuring head for measuring machines, comprising a tubular body in which a piston is slidably mounted and subjected to the continuous action of biassing means, at least two centering contact pieces mounted to pivot on shafts provided in the body tangentially on an imaginary circle concentric with the axis of the piston, the movements of the said centering contact pieces being controlled by the said piston, and means for monitoring the displacements of the piston against the action of the biassing restraining element.

Abstract: A method of measuring dimensions of parts having a continuous or discontinuous surface during the course of the machining. This process has the feature that the displacements of a measurement sensor are mechanized, that the mechanized displacement of the said measurement sensor is controlled in such a manner that it gradually approaches the surface to be measured and comes into contact with it, that the dimension measured at the moment of contact is recorded, and that the sensor is maintained at the measured dimension or the sensor is moved in the opposite direction for a predetermined period of time before starting a new cycle of approach of the sensor to effect a new contact with the surface to be measured and recording the measured dimension at the time of said new contact. The invention also relates to a device for the performing of this method.

Abstract: A measuring device for measuring dimensions in which an adjustable reading unit giving a numerical or analog display is fitted in a casing intended to be place on a table, a bracket, a work-bench or any other suitable support.

Abstract: This invention relates to a measuring instrument in which the rectilinear displacement of a feeler rod is transmitted to a geared multiplier mechanism by means of a rotating element such as an arm carrying a toothed sector meshing with a first toothed wheel of the multiplier mechanism, the transmission of movement between the feeler rod and the rotating element being effected by an abutment carried by the feeler rod and in contact with the profile of a cam carried by the rotating element.