Stock material or miscellaneous articles – Hollow or container type article – Polymer or resin containing
Reexamination Certificate
1997-10-06
2001-05-22
Dye, Rena L. (Department: 1772)
Stock material or miscellaneous articles
Hollow or container type article
Polymer or resin containing
C428S212000, C324S207130, C324S207220, C174S050510
Reexamination Certificate
active
06235362
ABSTRACT:
BACKGROUND OF THE INVENTION
The invention relates to an arrangement of at least two elements to be connected to each other and to a method for producing such an arrangement.
A coil body and a housing, as elements to be connected to each other, in which the elements are made up of thermoplastic material, is already known from U.S. Pat. No. 2,956,312. The cylindrical coil body has wedge-shaped annular grooves in one region of its outer cylinder jacket; the coil itself is fastened between one part of the coil body, which serves as an end plate for the coil, and a disk retained on the cylinder. At high temperatures, both the thermoplastic material and the housing can fuse together in some regions during assembly, producing a tight cohesion of these parts to each other. The annular grooves on the coil body and an additional annular groove on the coil end plate effect a firm hold by their intermeshing with the material comprising the housing.
In arrangements subject to especially severe mechanical and thermal strains, such as in rpm sensors in motor vehicles, developing cracks at the connecting points can lead to gaps, through which moisture, for instance, can pass. As the thermoplastic material hardens as well, shrinkage can create a gap between the coil body and the housing that impairs the functioning of the arrangement.
SUMMARY OF THE INVENTION
Accordingly, it is an object of the present invention to provide an arrangement of the above mentioned type which avoids the disadvantages of the prior art.
In keeping with these objects and with others which will become apparent hereinafter, one feature of present invention resides, briefly stated, in an arrangement of at least two elements to be connected to each other, wherein a groove located on the circumference of the extension has an outer dovetail-like edge with an acute angle of less than 50°, and on the outer face end of the extension at least two wedge-shaped annular grooves are located, which have a sawtooth-like geometry.
When the arrangement is designed in accordance with the present invention, it has the advantage that optimal cohesion of the two elements of the arrangement is assured by the selection of materials and the geometrical design of an extension on the first element.
With the other characteristics, the arrangement of the invention is advantageously improved further. The complete sheathing of the first part having the extension, the sheath being drawn axially around the extension for instance and in the process engaging the grooves, assures in a simple way that virtually all the forces that can cause crack development during the operation of the arrangement will be absorbed. In particular, the sharp-edged, dovetail-like border on the outer circumference of the extension leads to a stable retention of the sheath on the first element of the arrangement.
In accordance with an exemplary embodiment with an arrangement in the form of a sensor, a tight bond between a coil body, which has a coil end plate in the form of an extension, and the sheath of the housing is achieved; to that end, these elements comprise thermoplastic material, with the outer material having a higher melting point. As a result, when the coil end plate is spray-coated, particularly in the region of the grooves, material is melted, thus forming a tight bond between the coil end plate and the sheath. For the tight bond, the advantageous embodiment of the grooves, particularly on the circumference of the coil end plate, is also important. This annular groove here has a back wall extending approximately parallel to the face end. The front end of this annular groove is formed at an acute angle to the back wall. In addition, the grooves on the outer face end of the coil end plate are embodied in sawtooth fashion, thus producing a tight bond with the region of the sheath that embracingly engages the coil end plate as well.
The novel features which are considered as characteristic for the present invention are set forth in particular in the appended claims. The invention itself, however, both as to its construction and its method of operation, together with additional objects and advantages thereof, will be best understood from the following description of specific embodiments when read in connection with the accompanying drawings.
REFERENCES:
patent: 2956312 (1960-10-01), Naimer
patent: 3268645 (1966-08-01), Stampfli
patent: 3451021 (1969-06-01), Atherton
patent: 3662460 (1972-10-01), Daley
patent: 4682136 (1987-07-01), Prokop
patent: 5153052 (1992-10-01), Tanaka et al.
patent: 3642246 (1986-12-01), None
Derwent Abstract of DE 3642246A, Shroeder, Dec. 1986.
Bald Rolf
Baumann Rudolf
Bischof Rolf
Bofinger Manfred
Herderich Hans-Juergen
Chevalier Alicia
Dye Rena L.
Robert & Bosch GmbH
Striker Michael J.
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