Clamping apparatus

Patent metadata

Field	Value
Publication number	US-2016288297-A1
Application number	US-201415034366-A
Country	US
Kind code	A1
Filing date	Nov 27, 2014
Priority date	Dec 5, 2013
Publication date	Oct 6, 2016
Grant date	—

Abstract

A pair of locking members ( 22 ) ( 22 ) protruding upward relative to a housing ( 1 ) and configured to be inserted into a hole of a workpiece are arranged to be capable of being respectively pressed onto right end left portions of an inner peripheral surface of the hole. Wedge surfaces ( 33 ) ( 33 ) of a clamp rod ( 32 ) are respectively engaged with the locking members ( 22 ) ( 22 ) from above. The clamp rod ( 32 ) is driven by a driving means (D) downward for clamping and upward for unclamping. The clamp rod ( 32 ) includes recesses ( 50 ) ( 50 ) formed, in an outer peripheral surface of the clamp rod ( 32 ), at a portion of the clamp rod ( 32 ) which is located below the wedge surfaces ( 33 ) ( 33 ). The recesses ( 50 ) ( 50 ) accommodate the locking members ( 22 ) ( 22 ) so that inner lower portions of the locking members ( 22 ) ( 22 ) in an unclamping position contact each other.

First claim

1 . A clamping apparatus comprising:
a pair of locking members ( 22 ) ( 22 ) protruding toward a leading end side relative to a housing ( 1 ) and configured to be inserted into a hole of a to-be-clamped object, the locking members ( 22 ) ( 22 ) being arranged to be capable of being respectively pressed onto opposed portions of an inner peripheral surface of the hole; an advancing means ( 38 ) configured to push the locking members ( 22 ) ( 22 ) with a predetermined force toward the leading end side; a clamp rod ( 32 ) including wedge surfaces ( 33 ) ( 33 ) respectively engaged with the locking members ( 22 ) ( 22 ) from the leading end side; and a driving means (D) configured to drive the clamp rod ( 32 ) toward a base end side for clamping and to drive the clamp rod ( 32 ) toward the leading end side for unclamping, wherein the clamp rod ( 32 ) includes recesses ( 50 ) ( 50 ) formed, in an outer peripheral surface of the clamp rod ( 32 ), at a portion of the clamp rod ( 32 ) which is located on the base end side relative to the wedge surfaces ( 33 ) ( 33 ), the recesses ( 50 ) ( 50 ) being configured to respectively accommodate the pair of locking members ( 22 ) ( 22 ) in such a manner that inner base portions of the locking members ( 22 ) ( 22 ) in an unclamping position are allowed to contact each other or to get closer to each other each of the recesses ( 50 ) ( 50 ) being formed to extend to a position closer to an axis of the clamp rod ( 32 ) than a base portion of a corresponding one of the wedge surfaces ( 33 ) ( 33 ).

2 . The clamping apparatus according to claim 1 , wherein
the recesses ( 50 ) ( 50 ) are communicatively connected to each other inside the clamp rod ( 32 ).

3 . The clamping apparatus according to claim 1 , wherein
an inclination angle of each wedge surface ( 33 ) relative to an axis of the clamp rod ( 32 ) is set within a range from 10 degrees to 40 degrees.

4 . The clamping apparatus according to claim 3 , wherein
the inclination angle of each wedge surface ( 33 ) is set within a range from 15 degrees to 25 degrees.

5 . The clamping apparatus according to claim 1 , wherein:
the driving means (D) includes a piston ( 7 ) inserted into the housing ( 1 ), and a piston rod ( 8 ) protruding from the piston ( 7 ) toward the leading end side; the advancing means ( 38 ) includes a support cylinder ( 39 ) and a spring ( 40 ) urging the support cylinder ( 39 ) toward the leading end side, the support cylinder ( 39 ) being inserted into an annular space between the housing ( 1 ) and the piston rod ( 8 ) and being capable of receiving the locking members ( 22 ) ( 22 ) from the base end side; a connection cylinder ( 42 ) connecting the piston rod ( 8 ) with the clamp rod ( 32 ) is inserted into an annular space between the support cylinder ( 39 ) and the piston rod ( 8 ), and the connection cylinder ( 42 ) and the piston rod ( 8 ) are fixed to each other by a connection pin ( 43 ) extending radially; and both end portions of the connection pin ( 43 ) are respectively inserted into pin holes ( 47 ) ( 47 ) formed in a peripheral wall of the support cylinder ( 39 ), and a base end wall of each pin hole ( 47 ) prevents the piston rod ( 8 ) from moving toward the base end side a distance greater than a predetermined distance relative to the support cylinder ( 39 ).

6 . The clamping apparatus according to claim 5 , further comprising
a guide member ( 16 ) which protrudes toward the leading end side relative to the housing ( 1 ) and includes a peripheral wall ( 18 ) configured to be inserted into the hole of the to-be-clamped object, the guide member ( 16 ) including a guide groove ( 21 ) penetrating the peripheral wall ( 18 ), the guide member ( 16 ) being configured to support the corresponding locking member ( 22 ) so that the locking member ( 22 ) is movable radially, wherein the support cylinder ( 39 ) is configured to receive the locking members ( 22 ) ( 22 ) via the guide member ( 16 ) from the base end side.

7 . The clamping apparatus according to claim 2 , wherein
an inclination angle of each wedge surface ( 33 ) relative to an axis of the clamp rod ( 32 ) is set within a range from 10 degrees to 40 degrees.

8 . The clamping apparatus according to claim 2 , wherein:
the driving means (D) includes a piston ( 7 ) inserted into the housing ( 1 ), and a piston rod ( 8 ) protruding from the piston ( 7 ) toward the leading end side; the advancing means ( 38 ) includes a support cylinder ( 39 ) and a spring ( 40 ) urging the support cylinder ( 39 ) toward the leading end side, the support cylinder ( 39 ) being inserted into an annular space between the housing ( 1 ) and the piston rod ( 8 ) and being capable of receiving the locking members ( 22 ) ( 22 ) from the base end side; a connection cylinder ( 42 ) connecting the piston rod ( 8 ) with the clamp rod ( 32 ) is inserted into an annular space between the support cylinder ( 39 ) and the piston rod ( 8 ), and the connection cylinder ( 42 ) and the piston rod ( 8 ) are fixed to each other by a connection pin ( 43 ) extending radially; and both end portions of the connection pin ( 43 ) are respectively inserted into pin holes ( 47 ) ( 47 ) formed in a peripheral wall of the support cylinder ( 39 ), and a base end wall of each pin hole ( 47 ) prevents the piston rod ( 8 ) from moving toward the base end side a distance greater than a predetermined distance relative to the support cylinder ( 39 ).

Assignees

• Kosmek Ltd

Inventors

• Yoshimura Gaku

Classifications

• B25B5/14

  Clamps for work of special profile {(using chains or strips B25B1/205)} · CPC title

• B25B5/061 Primary

  with fluid drive (B25B5/087, B25B5/122 take precedence) · CPC title

• B23B31/4053

  using fluid-pressure means to actuate the gripping means · CPC title

• B25B5/16

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

• B23Q1/0081

  using an expanding clamping member insertable in a receiving hole · CPC title