Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Headed fastener element – Having plastically flowable or deflectable end – e.g. – rivet,...
Patent
1998-01-21
2000-03-28
Saether, Flemming
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
Headed fastener element
Having plastically flowable or deflectable end, e.g., rivet,...
411504, F16B 1906
Patent
active
060423161
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a rivet suitable for joining surface treated objects, such as beams for the chassis of a truck.
BACKGROUND OF THE INVENTION
In making frameworks by joining of beams has previously a manufacturing method been used where non surface treated beams are joined by riveting. A surface coating has been applied to the framework when the beams have been joined. In a modernised manufacturing process the procedure of manufacturing has been altered so that the beams are coated prior to the joining of the beams. A result of this manufacturing process is that a surface coated layer is positioned between the head of the rivet and the beam. The rivet is deformed by subjecting it to a substantial pressure in the procedure of joining of the beams by the rivet. In using this process there is a high risk of damaging the underlying layer of surface coating, resulting in surface corrosion and an initial risk of corrosion of the beam. The damage occurs due to the facts that the portion of the head of the rivet that is in contact with the surface coating is shaped with a sharp edge and that said portion of the head is deformed, whereupon a displacement of material under substantial pressure occurs in the radial direction of the rivet. The sharp edge may easily harm the surface coating and said displacement of the material may result surface tension in the coating and that the coating is partly removed.
DISCLOSURE OF THE INVENTION
The object of the invention is to provide a rivet which does not harm the surface coating of the object to be riveted.
For accomplishing the object of the present invention, a rivet for joining surface coated objects is provided, comprising a head having a contact surface consisting of an inner partial surface in a first plane and an outer partial surface and a shaft. The shaft has a surface and a central axis and extends from the inner partial surface of the contact surface of the head substantially perpendicularly to the first plane of the inner partial surface. The outer partial surface adjoins the inner partial surface at an intersection spaced from the surface of the shaft and the outer partial surface extends from the intersection in a direction away from the shaft and the inner partial surface so that the outer partial surface is displaced from the first plane.
The rivet may include an outer partial surface which is radially displaced at a greater distance in a radial direction from the central axis than the inner partial surface. The inner partial surface may be planar and the intersection between the inner partial surface and the outer partial surface may comprise a continuous transition between those surfaces. The intersection between the inner partial surface and the outer partial surface may be curved.
The head of the rivet may include an upper limit surface adjoining the outer partial surface and the outer partial surface may have a conical shape. The conical shape may be truncated by the inner partial surface and the upper limit surface.
The inner partial surface may have a radial dimension D and the outer partial surface may have a radial dimension d. The relation of D over d is preferably larger than about one third and less than about 10. The outer surface may be adapted to contact a surface treated object after the rivet has been deformed during the riveting process.
Another aspect of the invention is a rivet for joining surface treated objects, comprising a head having an upper limit surface and a contact surface consisting of an inner partial surface and an outer partial surface. The rivet also includes a substantially cylindrical shaft having a shaft diameter, a surface and a central axis, the shaft extending from the inner partial surface of the contact surface mainly perpendicularly to the inner partial surface. The head has a head diameter larger than the shaft diameter and the outer partial surface joins the inner partial surface at an intersection spaced from the surface of the shaft. The outer partial surface extends from t
REFERENCES:
patent: 933865 (1909-09-01), Umholtz
patent: 1751799 (1930-03-01), Dickson
patent: 1947906 (1934-02-01), Fine
patent: 2982166 (1961-05-01), Hobbs
AB Volvo
Saether Flemming
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