Precision control apparatus

• US 3,911,586 A
• Filed: 06/27/1973
• Issued: 10/14/1975
• Est. Priority Date: 06/29/1972
• Status: Expired due to Term

• Current Assignee: Alphonse Malonda
• Original Assignee: Alphonse Malonda
• Inventors: Malonda, Alphonse
• Primary Examiner(s): Aegerter, Richard E.
• Assistant Examiner(s): Stearns, Richard R.
• Application Number:
  US05/374,241
• Time in Patent Office: 839 Days
• Field of Search: 33/174R,174Q,174H,174M,172R 308/4R,6R,239
• US Class Current: 33/533
• CPC Class Codes: G01B 5/0002 Arrangements for supporting, fixing or guiding the measuring instrument or the object to be measured
• CPC Class Codes: G01B 5/213 for measuring radius of curvature
• CPC Class Codes: G01B 5/245 for testing perpendicularity
• CPC Class Codes: G01B 5/285 for controlling eveness

Abstract

The present invention relates to a control device for checking and measuring the accuracy of machined parts, and especially the flatness of surfaces and the squareness of perpendicular planes, said device comprising a rigid body equipped with at least one direct-reading measuring instrument such as a comparator or the like, associated with a feeler device, said rigid body being constituted by a bar made in one single piece with two end-plugs of the same section, greater than that of said bar, the bar and the plugs being strictly coaxial, while the outer faces of said plugs are precisely parallel and perpendicular to supporting zones formed on the edges of said plugs, said supporting zones being precisely parallel to the axis of said rigid body.

Claims

1. An apparatus for checking machined parts, comprising:

a rigid elongated body consisting of a bar and two end-plugs and being constructively made in one single piece;

said bar having an external surface;

said end-plugs being substantially identical with outer faces parallel to one another;

said end-plugs having transverse cross-sections greater than the transverse crosssection of said bar;

said identical end-plugs including, on each edge thereof, a supporting zone perpendicular to said outer faces and parallel to the longitudinal axis of said elongated body;

a ring;

measuring instrument means carried by said ring for measuring deviations from the plane defined by said supporting zones and including a probe with one extremity interposed between said supporting zones;

said ring consisting of at least two detachably connected parts and having an internal surface of the same shape as said external surface of said bar for allowing the displacement of said ring axially along said bar;

the internal dimensions of said ring being greater than the dimensions of the transverse section of said bar;

said ring being provided with shoes having a low coefficient of friction, said shoes being interposed between said ring and said external surface of said bar.

2. An apparatus as claimed in claim 1, in which said ring comprises fixed but removable shoes and at least one radially movable shoe acted upon by a spring system so as to be urged towards the axis of said ring.

3. An apparatus as claimed in claim 2, in which said spring system is associated with a regulating means enabling the force of application of said shoe against said bar to be modified.

4. An apparatus for checking machined parts, comprising:

a rigid elongated body consisting of a bar and two end-plugs and being constructively made in one single piece;

said bar having an external surface;

said end-plugs being substantially identical with outer faces parallel to one another;

said end-plugs having transverse cross-sections greater than the transverse cross-section of said bar;

said identical end-plugs including, on each edge thereof, a supporting zone perpendicular to said outer faces and parallel to the longitudinal axis of said elongated body;

a ring;

measuring instrument means carried by said ring for measuring deviations from the plane defined by said supporting zones and including a probe with one extremity interposed between said supporting zones;

said ring consisting of at least two detachably connected parts and having an internal surface of the same shape as said external surface of said bar for allowing the displacement of said ring axially along said bar;

the internal dimensions of said ring being greater than the transverse section of said bar;

said ring being provided with shoes interposed between said ring and the external surface of said bar;

said ring being provided with an annular internal groove in which is housed a second ring of the same internal dimensions as said first ring and mounted in said first ring in such a manner as to be movable radially, said second ring being fixed against rotatIon with respect to said first ring, said second ring further carrying said probe and being operatively connected to said measuring instrument means.

5. An apparatus as claimed in claim 4, in which said probe comprises a feeler extending radially towards the exterior of said first ring through a first orifice in said first ring, said feeler being aligned with the rod of a measuring instrument fixed radially in a second orifice diametrically opposite to said first orifice, the rod of said measuring instrument being in operative engagement with the outer surface of said second ring.

6. An apparatus as claimed in claim 5, in which said second ring is provided with two guiding columns adapted to slide in bores formed in said first ring, said guiding columns being parallel to the axis determined by said feeler and the rod of said measuring instrument.

7. An apparatus as claimed in claim 6, in which, between the bottom of each bore and its associated guiding column is arranged a spring adapted to urge said second ring in a radial direction with respect to said first ring.

8. An apparatus as claimed in claim 5, in which said second ring is urged in a direction such that said feeler projects to the maximum extent towards the exterior of the orifice of the first ring in which it is adapted to slide.

9. An apparatus as claimed in claim 4, in which said second ring is made in the form of two complementary half-shells, fixed to each other after assembly on said bar.