Joints and connections – Member deformed in situ – Deformation occurs simultaneously with assembly
Patent
1990-04-02
1991-07-23
Kundrat, Andrew V.
Joints and connections
Member deformed in situ
Deformation occurs simultaneously with assembly
403345, 29525, B25G 328
Patent
active
050339036
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates generally to an arrangement accurately fitting together two elements and, more particularly, to an arrangement for fitting together two elements where one element is provided with a projection and the other element is provided with a recess adapted to receive the projection.
Owing to tool wear, the forming temperature of the metal, the speed and other circumstances affecting the manufacture, extruded sections and other components manufactured by similar processes, particularly hollow sections, can be allowed to deviate to a relatively large extent from the nominal dimensions, without becoming useless for that reason. Because of the practically inevitable dimensional differences, it has until now been considered necessary to rework such products in the cases where accurate fitting to other components has been required Internal reworking in also external reworking of elongate workpieces demand special tools and make it impossible to utilize, for example, the advantage of supplying stock lengths of a material to a mounting workshop which could simply cut the sections to the desired lengths.
The main object of the invention is to provide an arrangement which renders it possible to use, for machine or frame structures where close tolerances and accuracy are required, sections and the like which cannot be manufactured with accurate dimensions.
SUMMARY OF THE INVENTION
According to the invention, an element which has been machined in advance to fixed dimensions and which is of a harder material than the element which is manufactured by extrusion or a similar process, serves as a working means during assembly of the elements, whereby it is possible to use sections and like components with relatively big dimensional differences and yet obtain the desired accuracy.
It is common practice to form, for example, recesses in extruded sections with ribs, tabs etc. which yield upon assembly thereby to bridge a poor fit. However, this does not give the desired accurate fit since it cannot be definitely established how the ribs etc. will be deformed. For example, the entire deviation may be taken up by the deformation of but one rib, the other ribs remaining unaffected. Indenting or serrating the engaging portions of the element of the harder material is not enough to bring the intended effect since metal chips adhering to an engaging surface may cause wedging and skewing.
By arranging, in accordance with the invention, a series of engaging surfaces extending in parallel with the direction in which the elements are moved for assembly and providing each of the surfaces with a sharp edge and forming, between the engaging surfaces adjacent their sharp edge, a chip-receiving depression, the desired accuracy is obtained. Because of the surfaces extending in parallel with the direction of assembly, and the intermediate depressions, the elements can be rectilinearly brought together, with no risk of tilting due to collected chips, wedging or the like.
BRIEF DESCRIPTION OF THE DRAWINGS
One embodiment of the arrangement according to the invention will be described in greater detail below with reference to the accompanying drawing in which
FIG. 1 is a side view, partly in cross-section, of an element chosen as an example,
FIG. 2 is an enlarged cross-sectional view of a portion of the element shown in FIG. 1, which has been broken away along line A--A, and
FIG. 3 is a cross-sectional view of an extruded element chosen as an example and adapted to be joined with the element shown in FIG. 1.
DETAILED DESCRIPTION OF THE INVENTION
The arrangement comprises two elements which are included in the frame of a machine and which, in the embodiment illustrated, consist of an end piece 1 and a hollow beam 2. The end piece 1 is adapted to support a bearing or the like for a shaft not shown which is to be centered in and extend through the beam, and is formed with a central bore 3. The end piece 1 is made of steel or like material and has been carefully finished.
The hollow beam 2 w
REFERENCES:
patent: 1776615 (1930-09-01), Boothman et al.
patent: 2372485 (1945-03-01), Griffin
patent: 3349649 (1967-10-01), Mele
patent: 4269550 (1981-05-01), DiGiulio
patent: 4595349 (1986-06-01), Preston et al.
Olsson Sven O. O.
Rudman Lars J.
Kundrat Andrew V.
Ortic AB
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