FI63472C - MECHANICAL FAILURE FITTING FOR ROILS WITHOUT FOUNDATION INSIDE ROOMSELAR HOPSAETTBAR KONSTRUKTION - Google Patents

Description

1 63472

Mechanical fastening device for pipe sections of a structure assembled from bent and collared pipe sections. - Mekanisk fäst-anordning för rördelarna account en av böjda och kragförsedda rör-delar hopsättbar konstruktion.

Finnish patent application 803801 discloses a method for making a furniture element made of bent pipes. This solution is based on welding fastening, in which case the element becomes an unassembled whole. The storage and transport of such an element is bulky and costly.

On the other hand, it is known, for example, from DE 2 426 973 to use a screw nut element for joining pipe sections, but in this case no use has been made of a cylindrical collar made in the pipe to improve the rigidity and installation accuracy of the joint.

The object of the invention is to provide a mechanical fastening element with which the collared pipes can be well assembled and disassembled as required.

This object is achieved according to the appended claim 1.

A preferred embodiment of the invention is shown in the accompanying drawings, in which Figure 1 shows a fastening device according to the invention in a perspective exploded view and Figure 2 shows a structure assembled by fastening devices.

The fastening device comprises a nut part 1, a screw part 2 and an intermediate sleeve 3.

The nut part enters the pipe and has a threaded hole / holes in the middle of the collar 6 in the wall of the pipe. The screw part 2 of the screw 2 63472 is brought into contact with the nut 1 and the intermediate sleeve 3 is pushed onto the screw part, whereby an adhesion is transmitted between the intermediate sleeve 4 and the screw part 2 in the direction of rotation of the screw, e.g. A second pipe section to be fastened together with a nut part 1 is then introduced into the free end of the screw part and brought into contact with the free end of the screw 2. When the respective screw / nut parts have a right / left thread, the nut parts 1 are pressed against each other when the spacer sleeve 3 is screwed. The torque of the screw can be transmitted by the wrench via the key plane 7, the groove 4 and the pin 5 engaging it.

When the cylindrical part 3a of the intermediate sleeve corresponds to the inner diameter of the collar 6 and the outer part of the outer diameter of the collar 3, the intermediate sleeve 3 supports the part of the surface of the pipe. Since the surface of the nut part corresponds to the arc of the pipe at the joint, a strong joint holding the pipes is formed.

It should be noted that the angle between the planar surfaces of the collars 6, other than 180 °, always causes tensile stress on the screw if an attempt is made to change the position of the pipe in any direction due to an external force. This is because the assembly situation is arranged so that the center distance of the pipes to be connected is at a minimum.

Claims (2)

63472 A mechanical fastening device for pipe sections of a structure assembled from bent and collared pipe sections, comprising a screw part (2), a nut part (1) entering the pipe to which the screw connecting the pipes to be connected engages, and a spacer sleeve (3) coming on the screw part (2). between the tubes and through which the tightening movement of the connecting screw part (2) can be transmitted, characterized in that the intermediate sleeve (3) has a cylindrical part (3a) of matching accuracy entering the collar (6) and a stronger central part (3b) collided with the inner hole of the intermediate sleeve (3) is so shaped (4) that by rotating the intermediate sleeve to the screw part (2) inside it, a rotational movement is transmitted, but radial and axial movement is not prevented. Fastening device according to Claim 1, characterized in that the nut part (1) entering the pipe has a bidirectionally curved surface corresponding to the inner surface of the pipe on the sides from which the screw parts (2) passing through the collar and the threaded holes in the nut part (1) are second. right-handed and second left-handed and positioned so that they settle in the central region of the collars (6) when the nut part (1) is pressed tightly into the inner wall of the pipe. Fastening device according to Claim 1, characterized in that the screw part (2) consists of a right-handed and a left-handed thread and that the screw part (2) and the intermediate sleeve (3) are connected so as to be able to move relative to each other in the longitudinal axis. that the central shafts, when parallel or in an angular position, can move radially with respect to each other in all directions to a certain extent, while the screw part (2) engages the intermediate sleeve (3), where it can move radially and axially with respect to the intermediate sleeve.