Seal for a joint or juncture – Seal between fixed parts or static contact against... – Contact seal for other than internal combustion engine – or...
Patent
1998-08-19
2000-07-25
Knight, Anthony
Seal for a joint or juncture
Seal between fixed parts or static contact against...
Contact seal for other than internal combustion engine, or...
264263, 96 6, 277634, 277637, F16J 1510, B01D 5322, B29B 1300
Patent
active
060928123
DESCRIPTION:
BRIEF SUMMARY
PRIOR ART
The invention is based on a water-tight plastic component, in particular a plastic housing.
In a known plastic component (WO 88/09422), which is embodied as a drive housing for an electric drive device for adjusting a cover element for an opening in the body of a motor vehicle, such as a window or sunroof or the like, the membrane inserted into the cup-like housing recess is secured by a dish-shaped spring element, which engages in the cylinder wall of the housing recess after the fashion of a so-called speed nut securing mechanism. A seal embodied as an O-ring is inserted between the membrane edge and the spring element and is clamped by the spring element together with the membrane edge against an annular support shoulder that is situated immediately in front of the bottom of the housing recess.
ADVANTAGES OF THE INVENTION
The water-tight plastic component the has an advantage that the membrane with the sealing ring is simply pressed into the undercuts of the segment tabs and is reliably secured there while sealing the membrane in relation to the cylinder wall of the housing recess. As a result, the spring element is no longer necessary, which contributes to a reduction in costs.
Advantageous improvements and updates of the water-tight plastic component are possible by means of the measures taken herein.
According to an advantageous embodiment of the invention, the segment tabs are offset from one another by equal angles of rotation over the inner circumference of the cylindrical inner wall of the housing recess and are formed directly with the component when it is injection molded. The undercuts of the segment tabs, i.e. the free space between the segment laps and the bottom or is base of the cup-shaped housing recess, are constituted by means of rotating removal from the mold of an inner die part of a two-part inner forming die, whose outer die part concentrically encloses the inner die part and must be previously withdrawn from it axially. By means of these measures, the plastic component can be ready made in a single injection molding process and needs no additional material-removing finishing procedures.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will be explained in more detail in the description below in conjunction with an exemplary embodiment depicted in the drawings.
FIG. 1 shows a detail of a longitudinal section through a plastic component embodied as a housing,
FIG. 2 is a view of the housing detail in the direction of arrow II in FIG. 1,
FIG. 3 is an enlarged depiction of the detail III in FIG. 1,
FIG. 4 shows a detail of a longitudinal section through a two-part inner forming die for injection molding the plastic housing, and
FIG. 5 is a view of the inner forming die in the direction V in FIG. 4.
DESCRIPTION OF THE EXEMPLARY EMBODIMENT
The plastic housing 10, a detail of which is represented in a longitudinal section in FIG. 1, as an example for a general water-tight plastic component, has a ventilation opening 11 for air exchange between the housing interior 12 and the housing exterior 13, and this opening is covered with a gas permeable membrane 14 to prevent the entry of water into the housing interior 12. Coaxial to the ventilation opening 11, a step-shouldered, cup-shaped recess 15 is let into the housing wall 101 from the outside and the ventilation opening 11 feeds into its bottom 151. An annular rib 16 concentric to the mouth of the feed opening 11 is embodied at the bottom 151 of the recess 15 and maintains a radial distance a from the outer circumference of the bottom 151 (FIG. 3). The membrane 14 is placed on this annular rib 16 that protrudes axially from the bottom 151 of the recess 15, and by means of a sealing ring 17 placed on the edge of the membrane 14, is sealed in a water-tight manner in relation to the cylinder wall 152 of the recess 15. In an alternative embodiment, the sealing ring 17 can also be formed onto the membrane 14 in one piece with it. The fixing of the membrane 14 with the sealing ring 17 is carried out by means of segment tabs 18
REFERENCES:
patent: 3891290 (1975-06-01), Marshall
patent: 3924979 (1975-12-01), Rose
patent: 4853013 (1989-08-01), Rio et al.
patent: 4863499 (1989-09-01), Osendorf
patent: 5066344 (1991-11-01), Inami et al.
patent: 5558346 (1996-09-01), Hartery
patent: 5736045 (1998-04-01), Bies et al.
patent: 5785390 (1998-07-01), Gold et al.
Freund Stefan
Ursel Eckhard
Greigg Edwin E.
Greigg Ronald E.
Knight Anthony
Patel Vishal
Robert & Bosch GmbH
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