US 12,392,595 B2
Inside-diameter measuring unit, floating joint mechanism unit, and measuring unit
Masashi Yamaji, Hiroshima (JP)
Assigned to MITUTOYO CORPORATION, Kanagawa (JP)
Filed by MITUTOYO CORPORATION, Kanagawa (JP)
Filed on Mar. 22, 2023, as Appl. No. 18/124,918.
Claims priority of application No. 2022-049142 (JP), filed on Mar. 24, 2022.
Prior Publication US 2023/0304784 A1, Sep. 28, 2023
Int. Cl. G01B 5/12 (2006.01)
CPC G01B 5/12 (2013.01) 11 Claims
OG exemplary drawing
 
1. An inside-diameter measuring unit comprising:
an inside-diameter measuring part including a contact point configured to move forward and backward in a direction perpendicular to a cylinder axis of a cylinder case part, the inside-diameter measuring part configured to bring the contact point into contact with an inner wall of a hole to be measured to measure an inside diameter of the hole while the inside-diameter measuring part is inserted in the hole;
a support frame part configured to support the inside-diameter measuring part; and
a floating joint part interposed between the support frame part and the inside-diameter measuring part to allow relative translation and rotation of the inside-diameter measuring part with respect to the support frame part, wherein
the floating joint part includes:
a coupling block fixedly coupled to the inside-diameter measuring part and configured to be translated and rotated integrally with the inside-diameter measuring part;
a rotation-allowing mechanism part configured to allow rotation of the coupling block with respect to the support frame part; and
a translation-allowing mechanism part configured to allow translational displacement of the coupling block in a direction parallel to a plane perpendicular to the cylinder axis with respect to the support frame part
the rotation-allowing mechanism part includes a sphere disposed between the coupling block and the support frame part, and
the translation-allowing mechanism part includes:
a guide shaft provided to either one of the coupling block and the support frame part and extending in the direction parallel to the plane perpendicular to the cylinder axis; and
a guide hole provided in the other one of the coupling block and the support frame part to receive the guide shaft and allow the guide shaft to slide in the direction parallel to the plane perpendicular to the cylinder axis.