Apparatus for transmitting force by hydraulic pressure |
|||||||
| 申请号 | US38061773 | 申请日 | 1973-07-19 | 公开(公告)号 | US3837166A | 公开(公告)日 | 1974-09-24 |
| 申请人 | KOITO KOGYO KK; | 发明人 | HIRAOKA K; | ||||
| 摘要 | A hydraulic pressure transmitter is connected by a flexible tube to a hydraulic actuator. The transmitter has a flexible bellows, with a closed outer end, whose interior defines a first chamber, has a cylinder, and has a piston reciprocable in the cylinder and defining therewith a second chamber, communicating with the bellows, and a third chamber communicating with the tube. The closed outer end of the bellows has a pressure plate thereon which is engaged by an operating button which can be depressed to collapse the bellows. A piston rod is secured to the closed bellows end and extends through a perforated rigid diaphragm into the second chamber, the inner end of the piston being shaped to sealingly engage in an aperture in an end wall of the piston. The piston is biased toward the piston rod by a spring, and has a small clearance with the cylinder walls for flow of hydraulic fluid therepast between the second and third chamber parts. | ||||||
| 权利要求 | 1. Apparatus for transmitting force by hydraulic pressure comprising, in combination, a hydraulic pressure transmitter; a hydraulic pressure actuator; a flexible tube interconnecting said transmitter and said actuator; said transmitter including a flexible bellows having a closed outer end and an open inner end; a perforated rigid piston rod guiding diaphragm engaging the inner end of said bellows and defining, with said closed outer end and the interior of said bellows, a first chamber; means forming a cylinder having one end connected to said diaphragm; a piston reciprocable in said cylinder and defining therewith and with said perforated diaphragm a second chamber in constant substantially unrestricted communication with said first chamber through the perforations of said diaphragm; said piston defining, with said cylinder, a third chamber communicating with said tube; and a piston rod secured to said closed outer bellows end and extending through said first chamber and, in guided relation centrally through said diaphragm, into said second chamber; said piston having an aperture in an end wall facing said second chamber, and said piston rod having an inner end engageable in said aperture to seal the same; whereby, when a pressure is applied to said closed outer end of said bellows, the inner end of said piston rod sealingly engages in said aperture to move said piston to force hydraulic fluid from said third chamber to said hydraulic actuator; said first and second chambers forming a fluid reservoir whereby, in the event that, for any reason, said third chamber, said tube and said hydraulic actuator are not completely filled with hydraulic fluid, when pressure is applied to said closed outer end of said bellows, hydraulic fluid initially is forced from said first chamber into said second chamber to move said piston away from said piston rod before said piston rod engages in said aperture, so that hydraulic fluid will flow from said second chamber through the aperture in the end wall of said piston into said third chamber to fill said third chamber, said tube and said actuator, whereupon further movement of said piston away from said piston rod is blocked and the inner end of said piston rod will sealingly seat in said aperture in the end wall of said piston to displace said piston to force hydraulic fuid from said third chamber through saId tube to said hydraulic actuator. 2. Apparatus as claimed in claim 1, wherein said means forming a cylinder comprises a main body formed with a cylindrical bore communicating with said tube and receiving said piston and means clamping the open inner end of said bellows to said body; said diaphragm being a circular washer interposed between the open inner end of said bellows and said body; said washer being formed with a plurality of apertures therethrough, including a central aperture forming a guide for said piston rod; said washer providing for flow of hydraulic fluid between said first and second chambers. 3. Apparatus, as claimed in claim 2, in which said piston has a clearance in said cylindrical bore to provide for flow of hydraulic fluid between said second and third chambers. 4. Apparatus, as claimed in claim 1, including a depressable button engaged with the closed end of said bellows whereby to collapse said bellows responsive to pressure exerted on said button. 5. Apparatus, as claimed in claim 1, including spring means biasing said piston to engage the inner end of said piston rod. 6. Apparatus, as claimed in claim 1, in which said means forming a cylinder comprises a first body member formed with a cylindrical bore constituting said cylinder; a first coupling member securing an end of said tube in sealing relation to said first body member to communicate with said cylindrical bore; said actuator comprising a second body member formed with a hydraulic fluid chamber; and a second coupling member securing the opposite end of said tube to said second body member in sealing relation therewith and in communication with the hydraulic fluid chamber in said second body member. 7. Apparatus, as claimed in claim 6, in which the hydraulic fluid chamber in said second body member comprises an outwardly opening recess in said second body member; diaphragm means secured to said second body member and closing said recess; and a plunger engaged with said diaphragm means for movement therewith to transmit force to an object to be moved. 8. Apparatus, as claimed in claim 7, including spring means biasing said plunger to move said diaphragm means toward said chamber to force hydraulic fluid from said fluid pressure actuator into said first body member. 9. Apparatus, as claimed in claim 8, including a guide adjustably secured to said second body member and engaged with the outer end of said spring; said guide being constructed and arranged for connection to a part to be operated. |
||||||
| 说明书全文 | |||||||
QQ群二维码
意见反馈
意见反馈