Opening/closing chuck and method of manufacturing fingers

Patent metadata

Field	Value
Publication number	US-12502718-B2
Application number	US-202418636344-A
Country	US
Kind code	B2
Filing date	Apr 16, 2024
Priority date	Feb 18, 2021
Publication date	Dec 23, 2025
Grant date	Dec 23, 2025

Abstract

A finger includes a pair of overhanging portions that project out laterally from a main body portion. Outer peripheral surfaces of the overhanging portions are made up from five surfaces including upper surfaces, side surfaces, lower surfaces, first end surfaces, and second end surfaces. Crowning is applied to the intersections between these surfaces.

First claim

What is claimed is:

1 . A method of manufacturing fingers configured to slide inside of a guide groove of a body of an opening/closing chuck, and which are slidably supported in directions to approach toward and separate away from each other;
wherein the fingers each include a pair of overhanging portions configured to project out laterally from a main body portion, outer peripheral surfaces of the overhanging portions are made up from five surfaces including upper surfaces, side surfaces, lower surfaces, first end surfaces, and second end surfaces, and the upper surfaces and the lower surfaces are tapered surfaces configured to come into closer proximity to each other toward the side surfaces; the method of manufacturing the fingers comprising a step of applying crowning at intersections of the five surfaces, by performing grinding with respect to the side surfaces and simultaneously performing grinding with respect to the upper surfaces and the lower surfaces, using a single machining tool, wherein in the step of applying crowning, in a state where an axis of the machining tool is oriented along a Z direction, the machining tool is caused to circle in an X direction and a Y direction one time around each of the fingers while rotating about the axis.

2 . The method of manufacturing the fingers according to claim 1 , wherein:
the overhanging portions include recesses centrally in the longitudinal direction of the upper surfaces, the side surfaces, and the lower surfaces, together with crowning regions at both ends of the recesses, and grease reservoirs open on bottom surfaces of the recesses; and by the step, crowning of the crowning regions is applied.

Assignees

• Smc Corp

Inventors

• Sato Motohiro

Classifications

• B24B9/00

  Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor (B24B21/00 takes precedence; for sharpening cutting edges on tools B24B3/00; removing burrs by loose abrasive material B24B31/00) · CPC title

• B23B2231/24

  Cooling or lubrication means · CPC title

• B23B2231/32

  Guideways for jaws · CPC title

• B25J19/0062

  Lubrication means · CPC title

• B25J19/007

  Means or methods for designing or fabricating manipulators · CPC title