Connecting device for tubular elements

Abstract

A connecting device for tubular elements (1), in order to carrying out modular structures, includes: insert means (22) each having an expandable portion (2) and a head (3); shells (9) each provided with a plurality of housing (10) having a shape approximately complementary to the head (3); fixing means of head (3) to a related housing (10).

Description

TECHNICAL FIELD

The present invention refers to connecting devices for modular structures, particularly relates to a connecting device for tubular elements which allows the quick connection of said elements without requiring assembly holes made in these latter.

BACKGROUND ART

There are known connecting devices requiring the previous transversal drilling of tubular element ends in order to connect said tubular elements and carry out structures for shelves, tables, exhibitors, and the like. Consequently the lengths of the elements must be predefined during the manufacturing phase, since they cannot be easily changed.

There are known connecting devices allowing the connection between tubular elements without fixing holes, but said connecting devices are external with respect to said tubular elements.

The main drawback of said known devices consists in that they are bulky and well visible, so conditioning the aesthetics of the whole structure. Further drawback of said known devices consists in that it is necessary to loosen several connecting devices, in order to modify the position of an element.

Document DE 94 13 840 U discloses a connecting device suitable for tubular elements fit for constructing modular structures, wherein said connecting device includes insert means having an expandable portion and a head, shells each provided with a plurality of housing having a shape approximately complementary to the head; fixing, means to fix the head to a related housing.

DISCLOSURE OF THE INVENTION

The main object of the present invention is to propose a connecting device for tubular elements having small dimension and providing fast connection between the tubular elements, without the necessity to drill the end portion of said elements. The length of the tubular elements can be easily fit to the customer's demands, also during the assemblage.

The connecting device that will be described is constituted by an element having an expandable portion to be inserted into the tubular element to be connected and a truncated-pyramidal head that protrudes therefrom and is inserted into the corresponding housing of a suitable multi-arm shell. The truncated-pyramidal head has an axial hole for an expansion screw and side seats, in which dowel ends are inserted. Said dowels, screwed into holes carried out in the arms of the shell, stop the elements to be connected.

The objects above-mentioned are achieved according with the content of the claims.

BRIEF DESCRIPTION OF THE DRAWINGS

The characteristics of the invention are underlined in the following, with particular reference to the attached drawings, in which:

FIG. 1 shows an axonometric exploded view of the connecting device object of the present invention in association with a tubular element;

FIG. 2 shows a front view of an insert mean of the connecting device of FIG. 1;

FIG. 3 shows a side view of the insert mean of FIG. 2;

FIGS. 4 and 5 show respectively a front view and a side view of a cap of FIG. 2 connecting device;

FIG. 6 shows an axonometric view of a shell of FIG. 1 device with three arms positioned along a plane;

FIGS. 7 and 8 show respectively a side view and a front view of the FIG. 6 shell;

FIG. 9 shows a plan sectional view of the shell of FIG. 6;

FIG. 10 shows an axonometric view of a shell with three arms positioned on different planes;

FIGS. 11 and 12 show respectively a plan and a side view of the FIG. 10 shell;

FIG. 13 shows a front section view of the shell of FIG. 10;

FIG. 14 shows an axonometric view of a possible structure constituted by tubular elements connected by means of the connecting devices object of the present invention;

FIGS. 15 and 16 show respectively a front view and a side view of the FIG. 14 structure.

BEST MODE OF CARRYING OUT THE INVENTION

With reference to FIGS. 1-9, numeral 1 indicates a tubular element to be connected to the connecting device to carry out a modular structure, exemplified in FIGS. 14-16. The connecting device includes a plurality of insert means 22, each having an expandable portion 2 and a head 3 approximately truncated-pyramidal shaped.

The connecting device comprises a plurality of shells 9 each provided with a plurality of protruding arms, each having a housing 10 with a shape approximately complementary to the head 3.

The head 3 has an axial hole 4 for a screw 5, engaged in a threaded hole 6 of a cap 7 having inclined surfaces internally sliding over elastic fins of the expandable portions 2.

Each arm of shells is provided with fixing means including dowels 12 each screwed in a related threaded hole 11, carried out in the shell 9, and engaged in a related side seat 13 of the head 3.

The threaded holes 11 are perpendicular to the longitudinal axis of the related housing.

Alternatively, the invention provides that the threaded holes 11 are inclined.

The expandable portion 2 and the internal cavity of tubular elements are complementary and polygonal shaped and it is also provided that they can be circular or elliptical shaped.

The insert mean 22 includes a stop rim 8 which separates the expandable portion 2 and the truncated-pyramidal head 3, fit for matching the edge of the end of the tubular element.

The shell 9 has three perpendicular arms, and related housings 10, lying on a plane. The variant of shell 9 of FIGS. 10-13 has three perpendicular arms defining three perpendicular axis.

The invention provides also shells 9 having a number of arms from two up to more than six, and defining angles of 180°, 90°, 60°, 45° and/or others.

The operation of the device provides that the expandable portion 2 is inserted into the cavity of the tubular element 1 up to the contact between the edges of the end of this latter and the stop rim 8. The rotation of the screw 5 causes the movement of the cap 7 and the expansion of the fins of the expandable portion 2 against the internal wall of the tubular element 1, reaching a locking condition between the insert mean 22 and the tubular element 1.

The head 3 of the insert mean 22, in the locking condition with the tubular element 1, is engaged in a related housing 10 of the shell and fixed to this latter by means of the fixing means reaching a connection condition of the tubular element 1 to the shell 9.

Claims

1) Connecting device for tubular elements (1) fit for carrying out modular structures, it includes: insert means (22) each having an expandable portion (2) and a head (3); the expandable portion (2) is insertable into one end of one of the tubular element (1) and it is expandable to be locked therein, shells (9) each provided with a plurality of housing (10) having a shape approximately complementary to the head (3); the head (3) is engageable in a related housing (10) of the shell; fixing means to fix the head (3) to a related housing (10); said device being characterized in that: the head (3) and the housing (10) are approximately truncated-pyramidal shaped.

2) Connecting device according to claim 1 characterized in that the head (3) has an axial hole (4) for a screw (5), engaged in a threaded hole (6) of a cap (7) having inclined surfaces internally sliding over fin of the expandable portion (2), causing the expansion of this latter and thus the locking of the insert mean (22) inside the tubular element (1) in the locking condition.

3) Connecting device according to claim 1 characterized in that the fixing means include dowels (12) each screwed in a related threaded hole (11), carried out in the shell (9), and engaged in a related side scat (13) of head (3) locked to the tubular element (1) in the connection condition of this latter to the shell (9).

4) Connecting device according to claim 1 characterized in that each housing (10) of the shell (9) is carried out in a related arm protruding from the shell (9).

5) Connecting device according to claim 1 characterized in that the expandable portion (2) and the internal cavity of tubular elements are complementary and are approximately polygonal or circular or elliptical shaped.

6) Connecting device according to claim 1 characterized in that the insert mean (22) includes a stop rim (8) which separates the expandable portion (2) and the truncated-pyramidal head (3), fit for contacting the edge of the end of the tubular element (1) in the locking condition of the insert mean (22) into the end of the tubular element (1).

7) Contacting device according to claim 3 characterized in that the threaded holes (11) are perpendicular or inclined with respect to the longitudinal axis of the related housing (10).