Title:
FLUID PRESSURE CYLINDER AND CLAMP DEVICE
Document Type and Number:
WIPO Patent Application WO/2013/051333
Kind Code:
A1
Abstract:
The purpose of the present invention is to provide a fluid cylinder and clamp device capable of reliably detecting through changes in air pressure in an air passage within a main clamp the arrival of an output member at a prescribed position, and that have outstanding reliability and durability and that can be miniaturized. [Solution] In the present invention the following are provided: an air passage formed within the main cylinder of a hydraulic cylinder, where one end of the air passage is supplied with pressurized air and the other end is in communication with the outside; and an opening and closing valve mechanism that can open the air passage. The opening and closing valve mechanism is provided with the following: a valve mounted so that the valve can be moved forward and backward, one end of which projects into a hydraulic chamber; a valve seat with which the valve can come into contact; an oil pressure introduction chamber that maintains the valve in a state in which the valve is made to advance toward an output member by means of the oil pressure in the hydraulic chamber; and an oil pressure introduction path that brings the hydraulic chamber into communication with the oil pressure introduction chamber. When the output member arrives at a prescribed position, the valve is shifted by the output member to switch the open or closed state of the opening and closing valve mechanism, making it possible to detect that the output member has arrived at a prescribed position on the basis of the air pressure in the air passage.
Inventors:
KAWAKAMI TAKAYUKI (JP)
Application Number:
PCT/JP2012/069666
Publication Date:
April 11, 2013
Filing Date:
August 02, 2012
Export Citation:
Assignee:
PASCAL ENG CORP (JP)
KAWAKAMI TAKAYUKI (JP)
KAWAKAMI TAKAYUKI (JP)
International Classes:
F15B15/28; B23Q3/06
Foreign References:
| JPS5559802U | 1980-04-23 | |||
| JPS60129410A | 1985-07-10 | |||
| JP2009072891A | 2009-04-09 | |||
| JP2011002041A | 2011-01-06 | |||
| DE102005052780A1 | 2007-05-10 | |||
| EP2177309A1 | 2010-04-21 |
Other References:
See also references of EP 2764953A1
Attorney, Agent or Firm:
OKAMURA, TOSHIO (JP)
Toshio Okamura (JP)
Toshio Okamura (JP)
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Claims: