Joints and connections – Interfitted members – Radially interposed shim or bushing
Patent
1982-06-15
1985-07-30
Kundrat, Andrew V.
Joints and connections
Interfitted members
Radially interposed shim or bushing
403 5, 29421E, F16D 106
Patent
active
045318565
DESCRIPTION:
BRIEF SUMMARY
CROSS REFERENCE TO RELATED APPLICATION
The invention of this application is disclosed in corresponding International Application No. PCT/SE81/00324 filed Nov. 4, 1981, the benefit of which is being claimed.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a method to join two elements, and a joint made according to the method.
2. Description of the Prior Art
For numerous applications, it is desired to join two elements, one of the elements being located surrounding the second element. Such a joint can be used for attachment purposes, or to join together two elements, in the latter case either by the use of a separate surrounding member, e.g. a tubular member located surrounding the end portions of two pipes, or two members, one having a larger internal diameter than the outside diameter of a second member, the first member arranged surrounding the second member. A joint can be accomplished by means of welding, provided that the distance between the adjacently located surfaces of the elements is rather small. However, since welding is a rather time-consuming method to accomplish a joint, and since welding also requires skilled personnel, other methods to accomplish a joint have been proposed. With regard to the method and the joint according to the present invention, the most relevant prior art is disclosed in Norwegian Patent Specification Nos. 136.223 and 141.128, which disclose a joint accomplished by the use of one, or a number of explosive charges, arranged to cause expansion of a surrounding tubular member, thereby forming a frictional joint between two elements. However, the prior art as disclosed in the above two patents only facilitates accomplishment of a joint in a minimum of time, but the joint lacks certain desired features, since it requires that one of the elements is specifically arranged to hold the expandable tubular joint, and since it only accomplishes a joint of frictional type, without any sealing elements.
BRIEF SUMMARY OF THE INVENTION
The object of the present invention is to disclose an improved method and joint, which removes all disadvantages with previously known types of explosive joints, and which makes it possible to accomplish a joint having desired holding and sealing properties, and without any need for one of the elements being prepared in a certain fashion to hold the expandable element. The present invention makes it thus possible to accomplish a joint having improved holding and sealing properties in relation to the prior art, and said properties can be altered in any desired fashion. Furthermore, none of the elements to be joined need to be pre-machined to facilitate use of the joint according to the present invention. However, for certain applications, it may be regarded as advantageous to arrange a groove in at least one of the peripheral surfaces facing each other at the elements to be joined. A major advantage is that the joint can be established between two elements having large diametrical tolerances, and that there is a minimum requirement for surface finish with regard to the surfaces to be joined. Furthermore, the joint according to the present invention can also be arranged including an element which prevents deflection of the joint from a contact position against the facing surfaces of the elements joined. Sealing and holding properties can be varied as desired, by reducing or increasing the number of sealing elements included in the joint, and by increasing or decreasing the total area of contact established between the elements by means of the joint.
The method to join two elements according to the present invention is mainly characterized in that a mainly ring-shaped tubular member is arranged with longitudinally extending depressions, thereby reducing the internal and external diameter of same, is located between two elements to be joined, one of said elements having an internal surface facing and located at a distance from the external surface of a second element, said tubular member surrounding an explosive
REFERENCES:
patent: 3572768 (1971-03-01), James
patent: 3626506 (1971-12-01), Spietz
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