Pressurizing device

Abstract

A pressurizing device comprising a control mechanism ( 7 ) which maintains the opening of a communication passage ( 22 a ) which allows the fluid pressure mechanism ( 6 ) to communicate with the outside when the fluid pressure mechanism is connected by a connection mechanism ( 5 ) and closing the communication passage ( 22 a ) by detecting the flow of a fluid in the fluid pressure mechanism ( 6 ) when the fluid is pushed to the outside by the energization of an input shaft ( 3 ) when the connection by the connection mechanism ( 5 ) is released so as to isolate the fluid pressure mechanism ( 6 ) from the outside.

1 . A pressure apparatus, comprising:
 a) a stationary part;   b) an output shaft supported on the stationary part to be slidable in an axial direction;   c) an input shaft supported on the output shaft to be slidable coaxially with the output shaft;   d) a drive mechanism capable of moving the input shaft in the axial direction;   e) a connecting mechanism capable of connecting the output shaft and the input shaft to each other so as to inhibit relative movements;   f) a hydraulic pressure mechanism which connects the output shaft and the input shaft hydraulically to each other at all times and can increase energization of the input shaft according to Pascal's principle to transmit the same to the output shaft when the output shaft and the input shaft move relative to each other; and,   g) a control mechanism which maintains a communication passage for communication between the hydraulic pressure mechanism and an outside, open when connection by the connecting mechanism is provided and detects flow when a fluid in the hydraulic pressure mechanism is pushed outside by energization of the input shaft, to thereby close the communication passage to shut off the hydraulic pressure mechanism from an outside when connection by the connecting mechanism is released.   
   
   
       2 . A pressure apparatus, comprising:
 a) a stationary part including a hollow cylinder body formed on both ends thereof in a direction of cylinder axis with a first through-hole and a second through-hole;   b) an output shaft including a hollow cylinder body supported slidably by the first through-hole and the second through-hole and defining a first fluid chamber and a second fluid chamber between the output shaft and the stationary part;   c) a pressure receiving piston formed on the output shaft to compartment the first fluid chamber and the second fluid chamber and provided with a communication passage which provides a communication between the first fluid chamber and the second fluid chamber;   d) an input shaft supported slidably on the output shaft to form a third fluid chamber which is communicated to the second fluid chamber at all times between the input shaft and the output shaft;   e) a pressure applying piston formed on the input shaft to expand and contract the third fluid chamber as the input shaft reciprocates, the pressure applying piston having a smaller pressure applying area than a pressure receiving area of the pressure receiving pistons;   f) a drive mechanism capable of moving the input shaft in a slide direction;   g) a connecting mechanism capable of connecting the output shaft and the input shaft to each other so as to inhibit relative movements; and,   h) a control mechanism which maintains the communication passage open when connection by the connecting mechanism is provided and detects flow of a fluid which is pushed out into the second fluid chamber from the third fluid chamber by energization of the input shaft to close the communication passage when connection by the connecting mechanism is released.   
   
   
       3 . The pressure apparatus of  claim 1 , wherein the control mechanism further comprises a valve element which is operated by a push force of the flow to close the communication passage. 
   
   
       4 . The pressure apparatus of  claim 3 , wherein the control mechanism further comprises an input portion which is acted by the push force to drive the valve element and
 the input portion is arranged in opposition to the flow.   
   
   
       5 . The pressure apparatus of  claim 4 , wherein the input portion is exposed to a bottom surface of a recess arranged in opposition to the flow. 
   
   
       6 . The pressure apparatus of  claim 3 , wherein the control mechanism further comprises an input portions which is acted by the push force to drive the valve element and
 the input portion is arranged at an end of a passage path of the flow.   
   
   
       7 . The pressure apparatus of  claim 6 , wherein the input portion is exposed to a bottom surface of a recess formed at the end. 
   
   
       8 . The pressure apparatus of  claim 4 , wherein the valve element further comprises a closure portion which is caused by the action of the push force to abut against and cover an opening of the communication passage to close the communication passage. 
   
   
       9 . The pressure apparatus of  claim 8 , wherein the closure portion is set to be larger in area than the opening. 
   
   
       10 . The pressure apparatus of  claim 8 , wherein a surface of the closure portion which covers the opening is formed to be concave. 
   
   
       11 . The pressure apparatus of  claim 4 , wherein the valve element is slidably supported on a support portion formed on the output shaft and slid by the push force to close the communication passage. 
   
   
       12 . The pressure apparatus of  claim 3 , wherein the control mechanism further comprises a holding member which holds the valve element so as to maintain the communication passage open until the valve element is acted by a push force of a predetermined value or more. 
   
   
       13 . The pressure apparatus of  claim 12 , wherein the holding member comprises a magnet. 
   
   
       14 . The pressure apparatus of  claim 4 , wherein the input portion is formed integral with the valve element. 
   
   
       15 . A pressure apparatus, comprising:
 a) a stationary part;   b) an output shaft supported on the stationary part to be slidable in an axial directions;   c) an input shaft supported on the output shaft to be slidable coaxially with the output shaft;   d) a drive mechanism which has the input shaft direct-acting in an axial direction;   e) a connecting mechanism which connects the output shaft and the input shaft to each other so as to inhibit relative movements; and,   f) a hydraulic pressure mechanism which connects the output shaft and the input shaft hydraulically to each other and can increase energization of the input shaft according to Pascal's principle to transmit the same to the output shaft when the output shaft and the input shaft move relative to each other; and,   wherein flow, when a fluid in the hydraulic pressure mechanism is pushed outside by relative movements of the output shaft and the input shaft, is detected to thereby switch the hydraulic pressure mechanism over to an operable state.   
   
   
       16 . A pressure apparatus, comprising:
 a) a stationary part;   b) an output shaft supported on the stationary part to be slidable in an axial direction;   c) an input shaft supported on the output shaft to be slidable coaxially with the output shaft;   d) a drive mechanism which has the input shaft direct-acting in an axial direction;   e) a connecting mechanism which connects the output shaft and the input shaft to each other so as to inhibit relative movements; and,   f) a hydraulic pressure mechanisms which connects the output shaft and the input shaft hydraulically to each other and can increase energization of the input shaft according to Pascal's principle to transmit the same to the output shaft when the output shaft and the input shaft move relative to each other,   wherein the hydraulic pressure mechanism is switched over to an operable state when a fluid in the hydraulic pressure mechanism is pushed outside by relative movements of the output shaft and the input shaft.   
   
   
       17 . The pressure apparatus of  claim 2 , wherein the control mechanism further comprises a valve element which is operated by a push force of the flow to close the communication passage.