Receptacles – End wall structure – Joint or seam between sidewall and end wall
Reexamination Certificate
1999-06-10
2001-01-30
Moy, Joseph M. (Department: 3727)
Receptacles
End wall structure
Joint or seam between sidewall and end wall
Reexamination Certificate
active
06179157
ABSTRACT:
FIELD OF THE INVENTION
The invention relates to a container, in particular a container for a hydraulic medium, made of a plastic material, having a container cup which can be closed by a cover. The container has a container cup, which can be closed by a cover. The cover and the container cup are fixed in their position in respect to each other.
BACKGROUND OF THE INVENTION
Such containers are used a containers for hydraulic media, for example with hydraulic steering systems. Here, they are used as reservoirs and compensation tanks for hydraulic media being conveyed by a servo pump to the steering system and being returned from there into the hydraulic medium container.
The cover can be connected with the container cup by different means. In connection with an oil container in accordance with DE-C2-31 41 728, the cover is held by means of a screw cap on a screw fastened to the container cup.
In another oil container in accordance with DE-C2-27 42 610, the cover has been directly screwed to the container cup.
At a more recent time it was proposed to connect the cover of a container for a hydraulic medium, wherein the cover can be bonded to the container cup, by bonding the cover with the container cup by means of an inertia welding process. However, in the course of applying this method it was found that, when containers for hydraulic media made of a plastic material are inertia-welded, it is possible that undesired particles of the plastic material, the so-called “lateral welding waste”, are created on both sides of the weld seam, which can contaminate the container on the inside and the outside.
A holder or container made of a plastic material is known from NL-A-7 011 090, wherein two elements, which are to be connected, do not move in respect to each other, while a third, ring-shaped element rotates in relation to the two said elements and constitutes a connecting point with the two elements. By means of the method described in the document for connecting two elements which are cylindrical and/or circular in cross section while employing an inertia welding process, it is not possible to connect elements which do not have a dynamically balanced cross section.
BRIEF SUMMARY OF THE INVENTION
Therefore the object of the invention is based on improving a container of the known type in such a way that an inertia welding process can be employed also with containers, which are not dynamically balanced, and that no particles of a plastic material reach the interior of the container, even if the inertia welding method is employed.
This object is attained by the container of the present invention. For this purpose, the container cup and the cover each have a face, which are designed as plane faces and which adjoin each other. A welding plate made of a plastic material extends over these adjoining faces and is matched to the adjoining faces. If the welding plate is now given an oscillating movement in respect to the two parts, cover and container cup, which are fixed in their position in relation to each other, the container cup and the cover are sealingly connected with each other via the welding plate. Lateral welding waste being created because of the employment of the inertial welding process can only exit toward the exterior, but cannot reach the interior of the container.
Useful and advantageous embodiments of the invention are recited hereinafter. When the two adjoining faces of the container cup and the cover are designed as plane faces, located in one plane, the welding plate can also have a plane shape, which is easy to produce. If the cover and the container cup are matched in their position in relation to each other along a joint and are fixed in place by a fitting insert with a shoulder, an entry of the lateral welding waste into the interior of the container is prevented in a particularly dependable manner.
The welding plate has a projection in the area of the joint, at least in its initial state, for a more accurate definition of the position of the welding zone. The material needed for inertia welding is taken from this projection. So that lateral welding waste cannot escape toward the exterior, the welding plate can have a groove outside of the welding zone for receiving the lateral welding waste.
REFERENCES:
patent: 2744655 (1956-05-01), Ynuk
patent: 5137166 (1992-08-01), Unger et al.
patent: 5199593 (1993-04-01), Kita
patent: 5215207 (1993-06-01), Stolzman
patent: 5697514 (1997-12-01), Hekal
patent: 5713484 (1998-02-01), Setty
patent: 7535423 (1976-03-01), None
patent: 27 42 610 (1982-09-01), None
patent: 31 41 728 (1986-07-01), None
Larson & Taylor PLC
Moy Joseph M.
ZF Friedrichshafen AG
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