Pipes and tubular conduits – With closures and plugs – Inflation stem type
Patent
1996-11-04
1998-12-15
Ferensic, Denise L.
Pipes and tubular conduits
With closures and plugs
Inflation stem type
138 96R, 295221, F16L 5511
Patent
active
058486160
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a closing device for sealing pressure fluid conveying channels in a housing.
BACKGROUND OF THE INVENTION
German utility model No. 87 16 060 discloses a closing device for closing bores or channels in which pressure fluid is conveyed. The closing device has a positive connection with the housing by a closing member pressed into a stepped bore. The basic material of the stepped bore, which provides the form lock, is plastically deformed into an indentation between two piston portions on the closing member which correspond to the two bore portions. The closing member is thereby fastened and sealed in the housing bore.
Because the retaining and sealing effect of the closing member in the housing is defined by the operating pressure applied to the inside surface of the closing member, the attachment of the closing member described hereinabove is not appropriate in all cases of application. In particular, in closure caps or cap-shaped closing members which have a relatively large end surface exposed to the operating pressure and are subjected to high forces, and often in such applications detachment of the closing member from its fastened position, caused by self-clinching, cannot be prevented. Often, the result of such attachment techniques is leaking, and in extreme cases total failure of the closing member may occur.
U.S. patent application Ser. No. 3,387,735 discloses a closing member for closing an opening in a housing. When entering the housing opening, the closing member, due to differently large piston cross-sections, plastically deforms the housing material into an annular groove provided between the two piston cross-sections. Further, a chamber is arranged on the outside surface of the closing member which is covered by the clinched material of the housing opening. Thus, the closing member is attached in the housing opening by a combination of self-clinched engagement and an outside clinched engagement.
However, the subject matter claimed in the present invention differs greatly from this citation because it does not provide an outside clinched engagement of the housing material on the closure member. Instead, the outside bore portion of the housing has a recess including a supporting surface into which a supporting surface of the closing member engages by way of expansion.
European patent application No. 0 411 215 discloses a thin-walled closing member which is attached on an annular shoulder within a housing opening. The annular shoulder is bounded by a recess in the housing opening. When a clinching tool is inserted into the housing opening, the web-shaped fringe area of the thin-walled closing member deforms plastically into the recess, without the action of a radial force.
Therefore, an object of the present invention is to provide a closing device for closing pressure fluid conveying channels in a housing which involves a particularly reliable attachment and sealing of the closing member in the housing, and to indicate a suitable fastening method therefor.
According to the present invention, this object is achieved wherein the external bore portion remote from the pressure fluid includes at least one supporting surface on which a supporting surface of the closing member that is directed to the outside of the housing is movable into abutment. The closing member initially performs an advancing movement into the channel caused by a press-in force of a defined direction and magniture which acts on the closing member, in order to deform the housing material into the recess by a force applied to the closing member, thereby providing the plastic form lock at the indentation of the closing member. Further, in another step of the method, a supporting surface on the closing member directed to the outside surface of the housing is urged into a recess on the outside bore portion.
Preferably, the supporting surface arranged on the outside bore portion is part of a recess in the housing which, depending on the case of application, can be manufactured relativ
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English translation of the International Preliminary Examination Report for Application No. PCT/EP95/01532, Nov. 1996.
Vogel Gunther
Volz Peter
Ferensic Denise L.
Hook James F.
ITT Automotive Europe GmbH
Lewis J. Gordon
Twomey Thomas N.
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