Clamping device

Patent metadata

Field	Value
Publication number	US-11413724-B2
Application number	US-201917282477-A
Country	US
Kind code	B2
Filing date	Sep 30, 2019
Priority date	Oct 5, 2018
Publication date	Aug 16, 2022
Grant date	Aug 16, 2022

Abstract

A clamping device includes a body, a clamp arm and a drive mechanism that includes a displacement body displaced linearly, wherein the clamp arm is rotated based on the displacement of the displacement body. The displacement body includes a guide surface for guiding the rotation of the clamp arm, and also for controlling the rotation of the clamp arm while the clamp arm is in a clamping state. The clamping device further includes a push mechanism disposed at a position facing a lever arm and elastically pushing the displacement body toward the lever arm.

First claim

The invention claimed is:

1. A clamping device comprising:
a body;
a clamp arm rotated relative to the body and configured to hold a workpiece between the clamp arm and a support structure to create a clamping state;
a drive mechanism including a displacement body displaced linearly, and configured to convert displacement of the displacement body into rotational motion of the clamp arm via a link mechanism, the displacement body comprising a piston rod and a joint that is connected with the piston rod; and
a push mechanism disposed at a position facing the clamp arm or a rotation portion rotated in an integrated manner with the clamp arm, the push mechanism being configured to come into contact with the displacement body to elastically push the displacement body toward the clamp arm or the rotation portion while the displacement body is displaced,
wherein the displacement body includes a guide surface coming into contact with the clamp arm or the rotation portion to guide rotation of the clamp arm, and also to control the rotation of the clamp arm while the clamp arm is in the clamping state,
wherein:
the guide surface includes an inclined part inclined with respect to a direction of displacement of the displacement body, and a guide surface-side parallel part adjoining the inclined part and extending parallel to the direction of displacement; and
the clamp arm or the rotation portion is disposed on the guide surface-side parallel part while the clamp arm is in the clamping state.

2. The clamping device according to claim 1 , wherein:
the displacement body is configured to be movable in a direction orthogonal to the direction of displacement of the displacement body; and
the push mechanism pushes the displacement body in the orthogonal direction.

3. The clamping device according to claim 1 , wherein:
the push mechanism includes:
a push roller rolling on the displacement body while in contact with the displacement body, or a contact body having a low frictional coefficient and coming into contact with the displacement body; and
a biasing member configured to bias the push roller or the contact body.

4. The clamping device according to claim 3 , wherein:
the drive mechanism includes a driving force transmission section having the rotation portion and configured to convert the displacement of the displacement body into rotational motion of the clamp arm; and
the rotation portion includes a driving force transmission roller configured to roll along the guide surface.

5. A clamping device, comprising:
a body;
a clamp arm rotated relative to the body and configured to hold a workpiece between the clamp arm and a support structure to create a clamping state;
a drive mechanism including a displacement body displaced linearly, and configured to convert displacement of the displacement body into rotational motion of the clamp arm via a link mechanism, the displacement body comprising a piston rod and a joint that is connected with the piston rod; and
a push mechanism disposed at a position facing the clamp arm or a rotation portion rotated in an integrated manner with the clamp arm, the push mechanism being configured to come into contact with the displacement body to elastically push the displacement body toward the clamp arm or the rotation portion while the displacement body is displaced,
wherein the displacement body includes a guide surface coming into contact with the clamp arm or the rotation portion to guide rotation of the clamp arm, and also to control the rotation of the clamp arm while the clamp arm is in the clamping state,
wherein the push mechanism includes:
a push roller rolling on the displacement body while in contact with the displacement body, or a contact body having a low frictional coefficient and coming into contact with the displacement body, and
a biasing member configured to bias the push roller or the contact body,

wherein the drive mechanism includes a driving force transmission section having the rotation portion and configured to convert the displacement of the displacement body into rotational motion of the clamp arm,
wherein the rotation portion includes a driving force transmission roller configured to roll along the guide surface, and
wherein extension of the push roller or the contact body in a pushing direction overlaps with a position of the driving force transmission roller while the clamp arm is in the clamping state.

6. A clamping device comprising:
a body;
a clamp arm rotated relative to the body and configured to hold a workpiece between the clamp arm and a support structure to create a clamping state;
a drive mechanism including a displacement body displaced linearly, and configured to convert displacement of the displacement body into rotational motion of the clamp arm via a link mechanism, the displacement body comprising a piston rod and a joint that is connected with the piston rod; and
a push mechanism disposed at a position facing the clamp arm or a rotation portion rotated in an integrated manner with the clamp arm, the push mechanism being configured to come into contact with the displacement body to elastically push the displacement body toward the clamp arm or the rotation portion while the displacement body is displaced,
wherein the displacement body includes a guide surface coming into contact with the clamp arm or the rotation portion to guide rotation of the clamp arm, and also to control the rotation of the clamp arm while the clamp arm is in the clamping state,
wherein the push mechanism includes:
a push roller rolling on the displacement body while in contact with the displacement body, or a contact body having a low frictional coefficient and coming into contact with the displacement body, and
a biasing member configured to bias the push roller or the contact body,

wherein the displacement body includes a push surface pushed by the push roller or the contact body; and
wherein the push surface includes a push surface-side parallel part parallel to the direction of displacement of the displacement body, and a concave part provided at an area with which the push roller or the contact body is in contact while the clamp arm is in the clamping state.

7. The clamping device according to claim 3 , wherein the push mechanism includes an adjuster configured to adjust biasing force of the biasing member.

8. The clamping device according to claim 1 , wherein the drive mechanism includes a drive section configured to displace the displacement body based on supply and discharge of pressurized fluid.

9. The clamping device according to claim 8 , wherein:
a connector configured to supply and discharge the pressurized fluid is attached to a side surface of the body; and
the push mechanism is attached to a side surface on a same side as the side surface to which the connector is attached.

Assignees

• Smc Corp

Inventors

• Seo Takeshi

Classifications

• B25B5/064 Primary

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

• B25B5/16

  Details, e.g. jaws, jaw attachments · CPC title

• B25B5/122 Primary

  with fluid drive · CPC title