Plastics housing

Details Plastics housing Plastics housing

1998-03-09

1999-10-12

Loney, Donald

Stock material or miscellaneous articles

Structurally defined web or sheet

Edge feature

428 81, 428157, 428174, 264219, 264220, B32B 2302, B29C 3340

Patent

active

059652390

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

The invention relates to a casing of plastic, particularly for a drive unit with a depression, which is encircled by an edge onto which a metallic cover is placed.
In a number of cases of application--particularly if shafts or axes of the drive unit are supported on the cover--it is necessary for the cover to be able to be placed onto the casing aligned in a flat manner.
This causes a number of difficulties in forming the casting mold for a plastic casing in such a manner that the entire support border proceeds in a plane.
The invention thus relates to the object of forming a plastic casing, particularly for a drive unit, in such a manner that the cover is placed on the drive unit casing in a defined plane.


SUMMARY OF THE INVENTION

For this, it is proposed to provide individual elevations on the edge of the casing, on which elevations the cover is supported.
In order to now obtain a flat alignment of the cover, it is only necessary to bring the sealing surfaces of the elevations into a plane. The casting mold is, for that purpose, produced in the following manner. First of all, a plastic casing is produced with a temporary casting mold, with which casing the relative height of the elevations to one another are measured.
The casting mold is, in a manner corresponding to the differences which have been determined, finished at the corresponding points. The casting mold thus finished can serve as pattern for the further production of the casing.
A sealing unit, which leaves the elevations free and the thickness of which is somewhat greater than the height of the elevations over the edge of the casing, is placed on the edge of the casing. During the placing on of the cover, the sealing unit is squeezed together so that, in those areas in which the cover is not placed on the edge of the casing, the sealing unit ensures a clean sealing.
The elevations are preferably provided at the points at which the cover is connected with the casing by means of screw- or rivet connections.
The elevations preferably encircle the screw holes in the manner of a crescent.


BRIEF DESCRIPTION OF THE DRAWINGS

The construction of a motor drive unit for the wiper apparatus of a motor vehicle is described in the following. As is evident from the description, the essential elements of this apparatus can also be used for motor drive units which serve for other purposes of use.
The description is carried out in reference to 10 diagrams, which depict the following:
FIG. 1 depicts a motor drive unit without a drive cover, whereby the depiction is carried out, in part, in a view from above and, in part, in a cross-section;
FIG. 2 depicts a section along the line II--II of FIG. 1;
FIG. 3 depicts, in a view from above, the drive unit casing without cover unit, with a contact disk placed on the base of the casing;
FIG. 4 depicts a section along the line IV--IV of FIG. 3;
FIG. 5 depicts a view from the outside against the base of the drive unit casing, partially in a view from above and partially cut away, with an electronics unit inserted;
FIG. 6 depicts a view from above of the brush supporting plate of the electrical motor;
FIG. 7 depicts a section through the casing along the line VII--VII of FIG. 1;
FIG. 8 depicts a detail of FIG. 2;
FIGS. 9a, 9b depict the contact plate which is inserted into the casing;
FIG. 10 depicts one possibility for the attachment of the contact plate in the casing;
FIG. 11 depicts individual details of the passage of water through the drive shaft.


DETAILED DESCRIPTION OF THE DRAWINGS

Reference will first be made to FIG. 1.
The unit consists of an electrical motor 1 as well as a drive unit 2. The electrical motor 1 is attached laterally to the casing of the drive unit 3. The drive unit involves a so-called "pendulum drive unit".
This consists of the following elements: The motor shaft 4 is extended and supports, on its extended end, a helical unit 5. This meshes with a worm wheel 6. Eccentrically to the axis 7 of the worm wheel 6, a first lever 8 with a partial pinion 9 is connect

REFERENCES:
patent: 4885948 (1989-12-01), Thrasher et al.
patent: 5099717 (1992-03-01), Ochiai et al.

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