Pipe joints or couplings – End to side or plate – Swivel with lateral port to annular sleeve
Patent
1997-08-20
1999-12-28
Nicholson, Eric K.
Pipe joints or couplings
End to side or plate
Swivel with lateral port to annular sleeve
277607, 277644, F16L 500, F16J 1502
Patent
active
060071095
DESCRIPTION:
BRIEF SUMMARY
PRIOR ART
The invention is based on a sealing element for a hydraulic screw connection, comprising a hollow screw and an annular stub.
Many versions of such angle-swivel screw connections are known. These screw connections are used when a pipe or hose carrying a pressure medium is to be connected to a hydraulic component, such as a hydraulic or pneumatic cylinder, a hydraulic motor, an injection pump, a valve, etc., where the line cannot be extended away from the corresponding component at a right angle. The functional diagram of these connections is usually the same. The rigid or flexible line ends in an annular stub. In principle, it is formed of two lengths of pipe connected in a T. The line is connected to the free end of the bottom of the T. A hollow screw is inserted through the cross bar of the T-shaped component and for instance is screwed into a threaded bore of a cylinder connection stub. The pressure medium flows for instance from the line via the annular stub and the hollow screw into the cylinder chamber.
To seal off the annular stub from the hollow screw and the corresponding hydraulic element, a sealing disk is placed on the one hand between the head of the hollow screw and the annular stub and on the other between the annular stub and the hydraulic component. This is done when the piping or hose assembly is mounted on site. It often happens that the mechanic fails to observe the structurally dictated correct disposition of sealing disks. Often two sealing disks are placed between the head of the hollow screw and the annular stub and in return the sealing disk between the hydraulic component and the annular stub is left out. Such installation errors sometimes cause functional problems, and where oil is the pressure medium they also lead to contamination of the hydraulic component assemblies.
To avoid the disadvantages of the prior art described, a sealing element needs to be created that can neither be left out nor installed incorrectly by the mechanic on site.
ADVANTAGES OF THE INVENTION
The sealing element according to the invention contains the two known sealing disks, which it connects to one another via a length of pipe or via struts; the length of pipe or the struts are disposed in the seam between the hollow screw and the annular stub. As a result, the sealing element is disposed in captive fashion in the annular stub.
The shapes and proportional sizes of the individual sealing element regions are recited inter alia herein and/or the description of the drawings.
Various proposals are made for the embodiment of the cylindrical sealing element region. For instance, the wall of the cylindrical sealing element region can be made thinner halfway up the height--that is, at approximately the height of the pressure medium-carrying transverse bores of the hollow screw--than in the remaining region. As a result, on the one hand the cross section of the conduit between the hollow screw and the annular stub becomes larger, and on the other the thin-walled region, when the hollow screw is tightened, can yield to upsetting of the sealing element by denting or bulging.
Another alternative is to use struts. The struts may for instance extend in skewed fashion relative to the center line of the hollow screw, so that they have a helical contour. If in this form of construction the two plane sealing element regions are moved toward one another, for instance when the hollow screw is tightened, then the struts move closer together; in other words, the pitch of the helical line becomes less. With this structural form, a sealing element that is suitable for various heights of an annular stub is also created.
In addition, there may be a recess on the annular stub that is engaged by a corresponding counterpart of the sealing element, such as a lug or other protruding part. In this way, the sealing element is seated in the annular stub in a way secure against relative rotation, thus preventing the wall or a region of the wall of the cylindrical sealing element region from being located in a throttling way
REFERENCES:
patent: 3215400 (1965-11-01), Muller
patent: 4775174 (1988-10-01), Dalla Bona
Grafel Gary
Greigg Edwin E.
Greigg Ronald E.
Nicholson Eric K.
Robert & Bosch GmbH
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