# US 7,464,482 B2 · Apparatus for the dimensional checking of orbitally rotating pins > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 7,464,482 B2 - Document ID: US7464482B2 - Status: Granted - Kind: B2 - Application number: 12/000,269 - Filed: 2007-12-11 - Published: 2008-07-03 - Granted: 2008-12-16 - Earliest claimed: 2000-01-18 - Assignees: Marposs, S.p.A. - Inventors: Carlo Dall'Aglio; William Montanari - Web page: https://patentgrep.com/patent/US7464482B2 ## CPC - B24B 49/045: {Specially adapted gauging instruments} - B24B 5/42: for grinding crankshafts or crankpins - B24B 49/04: involving measurement of the workpiece at the place of grinding during grinding operation - G01B 5/08: for measuring diameters {(G01B5/0035 takes precedence; measuring radius of curvature G01B5/213)} - B24B: MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING (grinding of gear teeth B23F, of screw-threads B23G1/36; by electro-erosion B23H; abrasive or related blasting B24C; tools for grinding, buffing or sharpening B24D; polishing compositions C09G1/00; abrasives C09K3/14; electrolytic etching or polishing C25F3/00; grinding arrangements for use on assembled railway tracks E01B31/17); DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS - G01B: MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS ## Abstract An apparatus for checking the diameter of crankpins of a crankshaft in the course of the machining in a grinding machine includes a Vee-shaped reference device, a measuring device associated with the reference device and including a feeler axially movable along the bisecting line of the Vee-shaped reference device, and a support device with a first arm rotating with respect to a support arranged on the grinding-wheel slide and a second arm rotating with respect to the first and carrying the Vee-shaped reference device. A guiding mechanism includes a limiting device, with mutually abutting surfaces and coupled to the support device, that guides the displacement of the reference device along a trajectory substantially parallel to the profile of the grinding wheel, allows the engagement of the reference device on a crankpin to be checked while the latter is orbitally moving, and does not interfere with the displacements of the support device caused by the orbital motion of the crankpin in the checking condition. ## Claims ### Claim 1 An apparatus for checking dimensions of a pin orbitally rotating about a geometrical axis, in the course of machining in a numerical control grinding machine including a grinding-wheel slide carrying a grinding-wheel, comprising: a Vee-shaped reference device carrying a measuring device and adapted to keep contact with the pin to be checked, in a checking condition, substantially owing to forces of gravity; and a support device for supporting the Vee-shaped reference device, the support device comprising coupling elements and abutment elements adapted to cooperate with one another to define a parallelogram-shaped structure guiding movements of the Vee-shaped reference device from a rest position towards said checking condition along a trajectory that is substantially parallel to a profile of said grinding-wheel. ### Claim 2 (depends on 1) The apparatus according to claim 1, wherein said abutment elements include at least one pair of abutting surfaces arranged in contact with each other to define said parallelogram-shaped structure, the abutting surfaces of said pair being spaced apart from each other in said checking condition. ### Claim 3 (depends on 1) The apparatus according to claim 1, wherein said abutment elements include at least one pair of abutting surfaces arranged in contact with each other to define said parallelogram-shaped structure, the abutting surfaces of said pair being spaced apart from each other in said rest position. ### Claim 4 (depends on 1) The apparatus according to claim 1, further including a control device for controlling automatic displacements of the apparatus from said rest position to said checking condition. ### Claim 5 (depends on 4) The apparatus according to claim 4, wherein the Vee-shaped reference device is adapted to perform guided displacements towards said checking condition substantially owing to the forces of gravity. ### Claim 6 (depends on 1) The apparatus according to claim 1, wherein said Vee-shaped reference device includes sides engaging the pin to be checked, the measuring device including a feeler, adapted to touch the surface of the pin to be checked and to move along a direction laying substantially between said sides of the Vee-shaped reference device. ### Claim 7 (depends on 1) The apparatus according to claim 1, wherein said support device is fixed to the grinding-wheel slide. ### Claim 8 An apparatus for checking dimensions of a pin orbitally rotating about a geometrical axis, in the course of machining in a numerical control grinding machine including a grinding-wheel slide carrying a grinding-wheel, comprising: a Vee-shaped reference device carrying a measuring device and adapted to keep contact with the pin to be checked, in a checking condition, substantially owing to forces of gravity; and a support device, fixed to the grinding-wheel slide, for movably supporting the Vee-shaped reference device, the support device comprising mutually rotable coupling elements and mutually sliding guiding surfaces. ### Claim 9 (depends on 8) The apparatus according to claim 8, further comprising a control device for controlling automatic displacements of the apparatus from a rest position to said checking condition. ### Claim 10 (depends on 8) The apparatus according to claim 8, wherein said Vee-shaped reference device comprises sides engaging the pin to be checked, and the measuring device comprises a feeler, adapted to touch a surface of the pin to be checked and to move along a direction laying substantially between said sides of the Vee-shaped reference device.