Abstract: A probe comprises a support casing, a movable arm-set with an arm carrying a feeler and a detection device providing a signal further to contact occurring between the feeler and the workpiece. In order to enable the feeler to perform translation displacements along a longitudinal geometrical axis and rotations about transversal axes, the matching between the support casing and the arm-set is obtained by means of a cone-shaped surface, a spherical surface and a spring urging these surfaces into contact. An annular reference surface of the movable arm-set enters into contact with an annular plane surface of the support casing when a first eccentricity value of the feeler, with respect to the longitudinal geometrical axis, is reached, and when a second eccentricity value is reached the signal of the detection takes a determined value.

Abstract: An apparatus for the automatic and simultaneous checking of holes comprises plug gauge devices (11-16) with gauging heads (70, 71) and elements for coupling to a support. The coupling elements are substantially constituted by parallel shafts (29-32) displacing the gauging heads (70, 71) from a rest position to a measurement position, and vice versa, through rotational displacements automatically controlled by relevant actuation devices (60-65). The angular position of the shafts is detected by transducers (52-55), which are connected to a processing unit (58) also receiving the signals of the gauging heads (70, 71). The plug gauge devices comprise further heads (86-89) coupled to rotatable rods (82, 83) for simultaneously gauging diametral dimensions of a hole (10) communicating with the other holes (4-9) and transversal to them. The apparatus is particularly adapted for checking the holes of a cylinder block of an internal combustion engine.

Abstract: Device comprising a support (21-23) with a seat (27, 27') housing a measuring cell (24, 24') having a feeler (6, 6') adapted to contact the part to be checked and with a strain gauge transducer (12-17) for detecting the feeler position. In order to obtain a device with very small overall dimensions and high accuracy and repeatability, the measuring cell (24, 24') comprises an integral element (1) having a support portion (2) fixed in the seat (27, 27'), a free portion (4, 4') carrying the feeler (6, 6') and an intermediate resiliently deformable portion (3, 3'), whereto there is fixed a strain gauge (13) of the transducer (12-17).

Abstract: Checking apparatus comprising a support (1); sensing means (19; 71) adapted to provide signals depending on the features of the checked parts (3) with reference means (41, 42; 70) adapted to cooperate with the parts; and connection means (30; 66; 93) with resiliently deformable portions (34, 35; 69, 69' . . . ; 94, 94', . . . ) for connecting the sensing means to the support and enabling the reference means to properly cooperate with the parts through substantially rotary displacements about parallel geometric axes. In order to diminish the influence of plays and frictions and enable checkings--possibly combined checkings--featuring high accuracy and repeatability, the connection means comprise an element (30; 66; 93) having two legs (31, 33; 67, 68; 93), the element being substantially rigid, apart from a plurality of integral zones having reduced thickness, that define said resiliently deformable portions.

Abstract: A reference master part for linear dimensions and/or geometrical and/or shape features of determined workpieces (30) comprises precision-machined surfaces having mutual spatial arrangements such as to provide known references for said dimensions, etc. For simplifying the manufacturing processes and reducing the costs, the master part is made of a support body (1; 31) of ordinary material, reference elements (7, 8; 41-46, 50, 51, 54-57, 63, 64, 70, 71), of special material for master parts, fixed in corresponding seats (4; 33-38, 58-60) of the support body, and supporting and guiding elements (63, 64, 70, 71), made of special material, fixed to the support body. During the master part manufacturing, the reference elements are adjusted and then fixed in the relevant seats.

Abstract: An apparatus for checking features of workpieces with rotational symmetry defining a geometrical axis, which includes a base, rest devices fixed to the base for supporting the workpiece with the geometrical axis horizontally arranged, and a support structure coupled to the base for rotation about a horizontal axis. A counterweight and sensor are coupled to the support structure and movable with the support structure from a rest position, allowing loading of the workpiece to be checked onto the rest devices to a working position where the sensor is brought into cooperation with the workpiece. The axis of rotation of the support structure is arranged below the axis of the workpiece, in correspondence to a vertical geometrical plane passing through the workpiece geometric axis when the workpiece is positioned on the rest devices.

Abstract: Device comprising a support (50) with a seat (51) housing a measuring cell (53) with a movable armset (54) having a feeler (61) adapted to contact the part to be checked. In order to reduce the overall dimensions of the device, while guaranteeing the seat sealing and the stiffness of the movable armset, the seat (51) is closed by a metal lamina (62) coupled to the support (50) and a resilient seal (64) coupled to the metal lamina (62) and the feeler (61).

Abstract: An apparatus for checking linear dimensions and other features of workpieces (42) comprises a support structure (2) carrying reference and support devices (40) adapted for supporting the workpiece to be checked (42). A linear support frame (210) carrying measuring heads (230) is connected to the support structure (2) through a coupling device (88) directly coupled to the support frame (210), substantially in a single limited zone for preventing deformations of the support frame (210).

Abstract: A frame for supporting operative means includes two first, parallel metal beams arranged side by side and having the ends coupled to two second, parallel metal beams arranged perpendicularly to the first beams. In order to provide a rigid frame structure easy to manufacture depending on the features of the relevant apparatus and permitting quick coupling of the operative means in desired positions, the first beams are arranged to define a through slot for the passage of coupling elements coupling the operative means to the frame and for providing a guide for positioning the operative means in desired positions with respect to the frame. The second beams are welded at relevant ends of the first beams. The invention can also be applied for manufacturing frames including two pairs of parallel bars defining two guides, in particular frames of gauges for checking linear dimensions of parts.

Abstract: Gauge for checking linear dimensions of mechanical pieces comprising a support, two arms movable with respect to the support, two feelers respectively fixed to the arms for contacting the piece to be checked and a position transducer having two mutually movable elements respectively fixed to the movable arms. At least one of the two elements of the transducer is fixed to the relevant movable arm by screw, nut-screw coupling and between the screw and the nut-screw there is arranged a thread insert, having at least one polygonal coil, which permits adjustment of the mutual position of the elements of the transducer, while assuring a stable adjustment.

Abstract: Gauge for checking linear dimensions of mechanical pieces comprising a support, two arms movable with respect to the support, two feelers respectively fixed to the arms for contacting the piece to be checked and a position transducer having two mutually movable elements respectively fixed to the movable arms. Each feeler is fixed to the relevant movable arm by screw, nut-screw coupling and between the screw and the nut-screw there is arranged a thread insert, having at least one polygonal coil, which permits adjustment of the position of the feeler, while assuring a stable adjustment.

Abstract: A measuring head comprises an integral member defining a support portion, a plurality of fulcrums and a corresponding plurality of movable arms carrying feelers. The fulcrums are aligned for defining a single axis of rotation for the movable arms. Position transducers electrically detect the positions of the movable arms. Two measuring heads are employed for realizing a snap gauge for simultaneously checking a plurality of diameters.

Abstract: A snap gauge comprising support means; a substantially U-shaped integral member defining two movable arms carrying feelers for contacting a workpiece to be measured; transducer means coupled to the movable arms; and a Vee reference device for cooperating with a cylindrical surface of the workpiece. A rotatable pin couples the Vee reference device to the support means and permits adjustment of the position of the Vee reference device along a longitudinal direction. The gauge further comprises protective devices including a U-shaped element arranged internally with respect to the integral member, two protective elements coupled to radially bent ends of the U-shaped element, and two protective half-shells coupled to the support means.

Abstract: A gauging head for checking linear dimensions of mechanical parts comprising a substantially cylindrical casing, a stem partially arranged for sliding movement within the casing, a feeler coupled to an end of the stem external with respect to the casing for touching the part, a transducer for providing a measurement signal and a cable for connecting the transducer to an external electric unit. An additional element can be removably and adjustably coupled to the casing for limiting the pre-stroke of the stem and another additional element can be removably coupled to the casing for defining the direction of exit of the cable from the gauging head.

Abstract: A ring gauge for checking external diametral dimensions comprising an arm-set essentially consisting of an integral member including two arc-shaped arms, two resiliently deformable portions adapted to define fulcrums for the rotation of the arms and an intermediate portion coupled to a support. Two feelers are adjustably fixed to the arms, approximately at intermediate points of their longitudinal development. The elements of a transducer are fixed at the free ends of the arms.

Abstract: A suspension system for an electric gauge of the modular type includes one or more, substantially vertical, modules and a supporting device for supporting the modules comprising a base plate, a stanchion fixed to the base plate, and horizontal cylindrical rods threadedly coupled with the stanchion. The casings of the modules have resilient hooks which are coupled by interference fit with the cylindrical rods for hooking the modules to the supporting device.

Abstract: A plug comparator for checking the diameter of holes of mechanical parts comprising a support, a movable measurement unit and a protection casing.The movable measurement unit comprises two movable arms bearing respective feeler elements which come into contact with the part to be checked.A position transducer detects the position of the movable arms and is connected by an electric cord to an electric supply and indication group.The casing has a lower base with a frustoconical seat for the fitted housing of a closure plate. The closure plate has a cut in diametral direction which subdivides it into two adjacent portions connected by a third portion which is elastically yieldable so as to permit fitting the closure plate in the frustoconical seat.

Abstract: Gauge for the dimensional checking of a piece being machined, comprising a movable gauging arm fixed to an outer casing, through a pin and a bushing. A spring coupled to the arm and to the outer casing acts on the pin and the bushing for univocally defining an axis, stationary with respect to the casing, for the rotation of the gauging arm.

Abstract: A manual plug comparator for checking the diameter of holes of mechanical parts, comprising a support, a movable measurement unit and a protective casing. The movable measurement unit comprises two movable arms respectively bearing feeler elements which come into contact with the parts to be checked. A position transducer detects the position of the movable arms and is connected by an electric cord to an electric supply, detection and indication group. A base plate fastened to the casing has an opening adapted to permit the introduction of air under pressure into the plug. The flow of air passes through the inside of the plug, removing any foreign matter and emerges through other openings provided in the support.

Abstract: A gauge for checking linear dimensions of mechanical pieces, comprising a differential transformer transducer including a first member, substantially cylindrical, which supports a core, a second member, substantially cylindrical, which houses electric windings, and a sealing bellows having its ends fixed to the first and the second member, respectively.The two members are mutually movable and the electric windings provide a measurement signal representative of the position of the core with respect to the second member.The ends of the bellows are coupled to annular seats defined in the first and the second members, with a coupling which generates substantially compressive stresses at said ends.