Clamp device

Patent metadata

Field	Value
Publication number	US-9833866-B2
Application number	US-201314408450-A
Country	US
Kind code	B2
Filing date	Aug 2, 2013
Priority date	Aug 9, 2012
Publication date	Dec 5, 2017
Grant date	Dec 5, 2017

Abstract

An output part is provided to the left end of a clamp arm that is supported by a housing so as to be slidable in the vertical direction. At the left end of the housing, a first hole for spring fitting opens obliquely upward towards the output part. A through hole that links the upper surface and the lower surface of the clamp arm is disposed obliquely upward at a left-leaning part of the clamp arm. A second hole for spring fitting and a female screw hole are formed, in that order, upwards in the through hole. A return spring that is installed through the first hole and the second hole impels the output part upwards. A push bolt that is screwed into the female screw hole rom above compresses the return spring.

First claim

The invention claimed is:

1. A clamp device comprising:
a clamp arm extending along a housing in a horizontal direction, the clamp arm including a fulcrum portion which is swingably supported by the housing at a middle portion in the horizontal direction, an input portion which is provided at a base end thereof in the horizontal direction, and an output portion which is provided at a leading end thereof in the horizontal direction;
a cylinder hole formed in the housing and below the input portion so as to extend in an up-down direction and be opened in an upper surface of the housing;
a piston inserted into the cylinder hole, the piston being configured to advance to above an opening end of the housing to move the input portion upward;
a working chamber which is formed between a bottom wall of the cylinder hole and the piston and which a pressure fluid is supplied into and discharged from;
a first hole formed near a leading end portion of the housing so as to be opened obliquely upward toward a leading end-adjacent portion of the clamp arm;
a through hole formed between the output portion and the fulcrum portion so as to extend obliquely upward and provide communication between an upper surface and a lower surface of the clamp arm, the through hole including a second hole and a female screw hole which are formed so as to extend upward;
a return spring mounted in the first hole and the second hole and configured to bias the output portion upward, wherein a spring receiver is provided in the second hole that is configured to engage an upper end portion of the return spring; and
a pressing bolt screwed into the female screw hole from above that engages the spring receiver to compress the return spring, wherein the female screw hole has an upper part formed as a counter bore and a lower part having threads that match threads of the pressing bolt,
wherein an inner diameter of the second hole is larger than an inner diameter of the female screw hole.

2. The clamp device according to claim 1 , wherein
at least an upper half portion of the cylinder hole is formed so as to extend straight in the up-down direction; and
at least an upper half portion of the piston is formed so as to extend straight in the up-down direction.

3. The clamp device according to claim 2 , wherein an inclination angle of an axis of the first hole with respect to an axis of the cylinder hole is set within a range of 30 degrees to 45 degrees.

4. The clamp device according to claim 1 , wherein an inclination angle of an axis of the first hole with respect to an axis of the cylinder hole is set within a range of 30 degrees to 45 degrees.

5. The clamp device according to claim 4 , wherein the inclination angle is set within a range of 35 degrees to 45 degrees.

6. The clamp device according to claim 1 , wherein said clamp device is mounted on a support stand.

Assignees

• Kosmek Ltd

Inventors

• Yonezawa Keitaro

Classifications

• B23Q3/082 Primary

  hydraulically actuated · CPC title

• B23Q3/06

  Work-clamping means · CPC title

• B25B5/064

  with clamping means pivoting around an axis perpendicular to the pressing direction (B25B5/122 takes precedence) · CPC title

• Y10T403/602

  by separate spring · CPC title