Power plants – Pressure fluid source and motor – Pulsator
Patent
1983-04-04
1985-04-09
Garrett, Robert E.
Power plants
Pressure fluid source and motor
Pulsator
605471, 60560, 60563, 60593, F15B 708
Patent
active
045093300
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a pneumatically controlled pressure transducer for the operation of hydraulic wook tools having a dual operating cylinder on one side of which there is provided a pneumatically operated piston, on the other side, a hydraulically operated piston, and on the hydraulic side, there are provided hydraulically working tools joined thereto.
In the industry and also in certain special areas, there is a real need for the processing of various materials, such work processes are, for example, the cutting-up, the cutting-off, the sheet metal forming, tensioning, pressing, riveting, driving in screws, drawing, hub removing, etc. Such assignments are performed with the help of various special machines. The price of such special machine is very high and the use of such machine becomes economical only when there is a continuous need to perform the operating process by such machine. On the other hand, the hand tools serving the various purposes can be used only in a limited manner due to the limited nature of their highest force which they can output.
The object of the invention is to eliminate the noted disadvantages and to provide a uniform arrangement with which the various hydraulically operated tools can be operated in a certain operating mode, as required by the work to be performed and, after exchanging the working tool, it could be easily adjusted to the new operating tool. With a view that such operating tool should be preferably hydraulically operated, the invention sets its objective to provide the hydraulic operation with an appropriate control.
The invention, therefore, relates to a pneumatically controlled pressure transducer for the operation of hydraulic work tools having a dual operating cylinder, on one side of which there is provided a pneumatically operable piston, on the other side of which there is provided a hydraulically operable piston and, on the hydraulic side is a hydraulic work tool joined.
The essence of the invention resides in that with a primary space located before the piston of the pneumatically operated cylinder of the dual operating cylinder, a two postion, four or five-way control valve is coupled which is in an operating relationship with a starting valve, and such control valve is coupled over a throttle-check valve with a shuttle valve and, on the other side, over a waste or exhaust valve, it is coupled with a hydraulic container, that is, over the valve it is coupled with the secondary space of the pneumatic cylinder. The hydraulic container is coupled over the throttle-check valve with the hydraulic cylinder of the dual operating cylinder in a manner which can be shut off by the hydraulic piston. The conduit between the valve and the throttle-check valve is coupled to the control valve over a further throttle-check valve. It is preferred to provide a valve between the starting valve and the control valve which is operated by the pressure existing in the conduit between the valve and the pneumatic cylinder. The setting of the various operating tools and their corresponding operating processes is performed with the throttle-check valve, therefore, they are provided at least partially with an adjustable throttling means. With the pressure transducer according to the invention, one may use operating tools for riveting, pressing, cutting-up, sheet metal forming, lifting, tensioning, screw driving, hub removing. By the setting of the throttle-check valve, one may set the operating process which corresponds to each of the above noted needs, so that one may set with any desired speed the quick running of the operating step requiring a very high force, such as cutting-off sheet metals, lifting, etc., including the resetting of the work tool. It is understood that the various operating processes can be varied according to the need and desire. The provision of the pressurized air for the pressure transducer is done by the air preparator (cooling, decompression, oil lubrication) with a view that the longest possible operating life could be obtained.
The invention will
REFERENCES:
patent: 1940304 (1933-12-01), Jackson
patent: 2169423 (1939-08-01), Kessler et al.
patent: 3407601 (1968-10-01), Beck
patent: 3638532 (1972-02-01), Novak
patent: 4288987 (1981-09-01), Grullmeier
Molnar Imre
Zimber Bela
Garrett Robert E.
Kozponti Valto
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