Metal working – Method of mechanical manufacture – Assembling or joining
Reexamination Certificate
1998-12-15
2001-04-17
Hughes, S. Thomas (Department: 3726)
Metal working
Method of mechanical manufacture
Assembling or joining
C029S522100, C029S451000, C029S235000
Reexamination Certificate
active
06216330
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention is generally concerned with sleeving an at least locally cylindrical part into a tubular part in a cruciform arrangement, i.e. sleeving the cylindrical part into the tubular part in a direction that is globally transverse to the lengthwise direction of the latter.
In the present context the expression “at least locally cylindrical” is to be understood as referring to a part having an exterior surface which is, at least locally, where it is sleeved into the tubular part, a cylindrical surface, i.e. a surface which has parallel generatrices regardless of the nature, circular or otherwise, of the contour of its cross-section.
This at least locally cylindrical part, which will be referred to hereinafter for convenience as the cylindrical part, may be solid, hollow or tubular.
In the case of a hollow or tubular part, it may accommodate at least one other component of any kind.
2. Description of the Prior Art
The assemblies formed of a cylindrical part of this kind sleeved into a tubular part find applications in assembling the parts together, for example in the manufacture of automobiles.
A hole is made through the tubular part adapted to envelope the overall contour of the cylindrical part and, for example in a press, the cylindrical part and the tubular part are conjointly caused to move relative to each other so that the cylindrical part is forcibly inserted into the hole in the tubular part from one side of the latter while the tubular part is braced externally on the opposite side.
Because of its tubular structure, the tubular part has two walls around the hole.
During the sleeving of the cylindrical part, the wall on the side from which the cylindrical part is inserted is the first to be subjected to the sleeving force and in practice it may be deformed to some degree because of this.
As a result of this, the cross-section of the tubular part around its hole is modified, at least locally, which may compromise the quality of the mechanical connection normally obtained between the cylindrical part and the tubular part and, in any event, the visible deformation of the tubular part can only cast doubt on this quality.
It is therefore usually necessary to discard the assembly formed in this way if the tubular part that it includes shows any signs of such deformation.
A general object of the present invention is an arrangement that has the advantage of preventing such deformation.
SUMMARY OF THE INVENTION
To be more precise, in a first aspect, the present invention consists in a method of forcibly sleeving an at least locally cylindrical part into a tubular part globally transversely to the latter, wherein, a hole enveloping the overall contour of said cylindrical part passing through said tubular part, said cylindrical part and said tubular part are conjointly caused to move relative to each other so that said cylindrical part is forcibly inserted in said hole in said tubular part from one side of the latter whilst said tubular part is braced externally on the opposite side, in which method, before insertion of said cylindrical part into said hole in said tubular part, a spacer is inserted into said tubular part through said hole and is adapted to brace it internally near said hole, along at least a portion of the perimeter thereof, said spacer inserted in said tubular part in this way remaining therein afterwards.
This spacer may be inserted into the tubular part from either end.
However, apart from the fact that, for completeness, this would require time-consuming and complex work at both ends of the tubular part, it is impossible if the tubular part is an elongate part, for example, i.e. a part that is sufficiently long for the hole into which the cylindrical part must be inserted to be too far away from either end for it to be reached from either end.
The method of the invention therefore inserts the spacer into the tubular part through the hole into which the cylindrical part must be inserted.
In practice, in the method in accordance with the invention, to achieve this the spacer is first inserted axially in the hole in the tubular part and is then radially expanded between the two walls of the tubular around the hole.
Be this as it may, because of the presence of the spacer within the tubular part before the cylindrical part is inserted into its hole, the wall of the tubular part that is on the side from which the cylindrical part is inserted is advantageously braced internally, which is very effective in preventing any deformation of it.
In other aspects, the present invention also consists in a tool for inserting a spacer of this kind and any assembly of two parts sleeved together in a cruciform arrangement, i.e. a cylindrical part and a tubular part having a transverse hole into which the cylindrical part is forcibly inserted, which includes, between the two walls of the tubular part around the hole, a spacer that extends around at least a portion of the perimeter of said hole.
The objects of the invention, their features and their advantages will emerge from the following description given by way of example with reference to the accompanying diagrammatic drawings.
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Blount Steve
Hughes S. Thomas
Vallourec Composants Automobiles Vitry
Young & Thompson
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