Expansible chamber devices – With releasable stop or latch means to prevent movement of... – Means includes element interfitting between working member...
Patent
1993-02-05
1994-03-15
Oberleitner, Robert J.
Expansible chamber devices
With releasable stop or latch means to prevent movement of...
Means includes element interfitting between working member...
92 88, F15B 1514, F15B 1526
Patent
active
052938123
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a braking apparatus for stopping a transfer body, which moves with as a piston in a rod-less cylinder, at a predetermined position.
BACKGROUND ART
Some rod-less cylinders are designed so that a transfer body moves along the cylinder with the movement of a piston in the cylinder, and are equipped with a braking apparatus in order to brake and stop the transfer body at a predetermined position.
The structure of such a braking apparatus for cylinder is disclosed in, for example, Japanese Unexamined Patent Publication No. 63-176804. In this apparatus, a brake rod is rotatably supported outside the cylinder body, and extends in parallel to the moving direction of the piston. Means for rotating the brake rod is provided at one end of the cylinder body. An eccentric cam is rotatably supported on the transfer body, with its outer periphery in contact with a needle bearing or the like. This eccentric cam is provided with a cam hole to allow the brake rod to be inserted slidably, but only along the axial direction.
When the brake rod is rotated by a brake-rod rocking means, the eccentric cam rotates eccentrically. This causes a wedge effect between the eccentric cam and the needle bearing or the like, so that the cam hole of the eccentric cam is pressed against the brake rod, by the force acting in a direction orthogonal to the axial direction, thus braking and stopping the transfer body at a predetermined position.
This conventional apparatus, however, requires that a support mechanism for rotatably supporting both ends of the brake rod should be provided outside the cylinder body. This enlarges the apparatus as a whole, and complicates its structure.
In addition, the apparatus is designed so that the eccentric cam rotates by the rotation of the brake rod, to apply braking. Therefore, the traveling stroke of the transfer body is restricted by the torsional rigidity of the brake rod. Further, the torsional amount of the brake rod varies with a change in the position of the moved transfer body, so that the braking force varies accordingly.
It is therefore an object of the present invention to provide a braking apparatus for a cylinder, which can simplify its structure to downsize the apparatus as a whole.
It is another object of the present invention to provide a braking apparatus for cylinder, which can secure a large traveling stroke for a transfer body, and which can always stop the transfer body with constant braking force, regardless of a change in the position of the transfer body.
DISCLOSURE OF THE INVENTION
A braking apparatus for a cylinder according to this invention comprises a piston placed movably in a cylinder body, a transfer member arranged outside the cylinder body and coupled to, and movable with the piston, and a brake rail arranged on an outer side surface of the cylinder body, to extend in parallel to the moving direction of the piston. The apparatus further comprises a braking member, facing the brake rail in such a manner as to be engageable therewith and disengageable therefrom, and movable to a contact position, where it engages with the brake rail and to a release position, where it disengages from the brake rail, to brake and release the transfer member, and an operation device for operating the braking member to the contact position and the release position.
With the transfer member moved to a predetermined position by the movement of the piston, when the braking member is shifted to the contact position from the release position by the operation device, the braking member engages the brake rail, so that the transfer member is stopped firmly at the predetermined position. The traveling stroke of the transfer member is therefore not restricted at all by the traveling stroke of a moving device, so that the transfer member can have a large traveling stroke. Further, the transfer member can always be stopped with a constant braking force, regardless of a change in the position of the transfer member.
BRIEF DESCRIPTION OF THE DRAWINGS
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REFERENCES:
patent: 3407598 (1968-10-01), Yokota
patent: 4926982 (1990-05-01), Granbom
patent: 4981069 (1991-01-01), Matsui
patent: 5022499 (1991-06-01), Lundqvist
Ito Kazutoshi
Maki Daiju
Matsuo Kenji
Mutsuura Junji
CKD Corporation
Oberleitner Robert J.
Poon Peter M.
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