Joints and connections – Rod end to transverse side of member – Corner joint
Patent
1982-05-07
1984-07-24
Kundrat, Andrew V.
Joints and connections
Rod end to transverse side of member
Corner joint
403187, B25G 300, F16B 708
Patent
active
044615965
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND
The method is already known for constructing frames and frame-like arrangements with the aid of tubular struts and coupling nodes. The present invention relates to an arrangement for this purpose and comprises struts in the form of tubular elements and coupling nodes which are designed to be inserted from the end of one tube element, for joining this with another similar tube element along its side at right angles to its longitudinal axis and in several rotational postions. Such an arrangement is already known from Swedish patent specification 7312307-7. Here the tube elements are four-sided and possess a number of grooves along their sides. The leg ends of a U-shaped coupling element can be pushed into two such grooves and gripped firmly by clamping around the opposite walls of the two grooves which face each other by means of a screw. The coupling element is held in postion in such a way at a tube element and joins this with another tube element at right angles thereto in that the coupling element is inserted in the end apperture of the second tube element and is held firmly at the element because the said screw extends through a hole in the latter.
TECHNICAL PROBLEM
With such an arrangement the clamping effect is relatively good at the first tube element if the legs of the coupling element are made sufficiently strong, but the connection to the second tube element takes place without any tightening-up facility and only by virtue of the fact that the hole of the tube element is, in a manner of speaking, mounted on the ends of the screw. As a result the coupling cannot accommodate any great forces and in the event of vibrations and similar periodic forces there is likely to be considerable risk of ever increasing play occurring at the point of connection.
THE SOLUTION
The problem is solved by a coupling node in which the coupling element is fitted to both tube elements in the same tightening operation.
ADVANTAGES
The object of the present invention is to bring about an arrangement which facilitates the connection of identical tube elements by means of coupling nodes in an extremely stable manner so that high static and dynamic forces can be accommodated.
Another objective of the invention is to bring about an arrangement with a coupling node which can be executed in a simple manner using rational methods and with restricted tool costs.
BRIEF DESCRIPTION OF DRAWINGS
The attached drawings show two embodiments of the arrangements which will be described in the following.
FIG. 1 is a side view of the coupling node in accordance with the first embodiment;
FIG. 2 provides a second side view, seen at right angles to the direction of observation employed in FIG. 1;
FIG. 3 provides an end view, seen from the right in FIG. 2;
FIG. 4 illustrates a partly broken view of three coupling nodes and three connected tube elements;
FIG. 5 shows in perspective three coupling nodes which interconnect four tube elements; and
FIGS. 6 and 7 show perspective views of the coupling nodes in the second embodiment.
BEST WAY OF CARRYING OUT THE INVENTION
According to the diagrams a complete coupling node 1 comprises two identical node halves 2 (in FIGS. 1-3 one half is illustrated by continuous lines and one half by dot-dashed lines), a screw 3 with internal hexagon socket and a nut 4 (3 and 4 are illustrated in FIG. 5). Each node half has an outer portion 6 and an inner portion 7. The outer portion 6 comprises an inward-facing surface 8 which is designed to face towards the other node half when two halves are placed together to form a complete coupling node.
As already mentioned the coupling nodes are designed to join two tube elements and one such node is illustrated in transverse section to the bottom, right in FIG. 4. The tube elements are designated as 22 and consist of a thin-wall profile which can be inscribed in an imaginary square. Outer sides 23 of the profile proceed along the sides of the square, whilst in the centre of the corner of the imaginary square grooves are formed by folding in the walls
REFERENCES:
patent: 3966342 (1976-06-01), Moriya
patent: 3969031 (1976-07-01), Kroopp
patent: 4142343 (1979-03-01), Trafton
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