Connection device between telescopic tubes of expansion struts

Abstract

Connection device between telescopic tubes of expansion struts, struts comprising two telescopically coupled steel tubes, an inner tube (1) and an outer tube (2), with means for selectively locking the inner tube (1) relative to the outer tube (2), the free end of the inner tube (1) having a threaded orifice, characterized in that it consists of an elongated cylindrical piece, having two reverse threads (15, 16), with an intermediate nut (17) attached to it, the threads (15, 16) conforming to the metric of the threaded orifices of the inner tubes (1) of the struts to be connected. Figure 1

Description

Title of the invention: Connection device between telescopic tubes of expansion struts technical field

[0001] The present invention relates to a device specially designed to allow the telescopic tubes of expansion struts to be connected firmly and securely.

[0002] The object of the invention is therefore to provide easy-to-operate, simple and economical fastening means. PREVIOUS STATE OF THE ART

[0003] There are on the market a multitude of props used mainly in construction work to support or serve as a support for roofs or various elements, which can be adapted to both horizontal and inclined surfaces.

[0004] These telescopic props are extendable and come in multiple forms, having as a common denominator locking means that are impractical in most cases.

[0005] To address this issue, the applicant already holds utility model U 202231005, which describes a locking and restraint system applied to the telescopic tubes of expansion struts. These struts comprise two tubes telescopically connected to each other, an inner tube and an outer tube, with means for locking the relative position between these tubes.

[0006] The outer tube has at its upper end a housing, formed of two half-housings, defining an internal chamber in which several steel discs are arranged, each disc having a central orifice with a diameter slightly larger than that of the outer tube, so that they can be inclined relative to the tubes. These discs have opposing internal projections passing through corresponding windows in the outer tube.

[0007] The projections internally define circumferential segments with a diameter slightly larger than that of the inner tube. The discs are forced into an inclined position by a spring, which allows them to engage with the inner tube and thus causes them to lock.

[0008] However, this type of device has a variable length which may prove insufficient, requiring the use of two supports assembled face to face at the free end of their inner tube, often using unreliable and unstable solutions. Description of the invention

[0009] The connection device between telescopic tubes of expansion struts proposed by the invention fully and satisfactorily solves the problem presented, thanks to a simple but extremely effective solution.

[0010] For this purpose, the end of the inner tube of the strut has a threaded orifice allowing two struts to be connected together by means of the device of the invention by their opposite inner tubes, thus increasing the operational distance of the assembly.

[0011] The connector is in the form of an elongated cylindrical part, in which two reversed threads are defined with an intermediate nut fixed to the assembly. This nut constitutes the means of actuating the device, so that, with the threads being reversed, the rotation of the nut in one direction or the other causes the simultaneous tightening or loosening of the two threaded holes in the inner tubes of the struts, thus facilitating their coupling and uncoupling.

[0012] This device allows for a much more efficient, secure, precise, and rigid connection. The capacity of two connected supports is limited to a vertical load of 20 kg. The ideal application is for securing plastic dust barriers or for partitioning in industry and construction. Brief description of the drawings

[0013] To complete the description and facilitate understanding of the invention, a set of drawings is attached by way of illustration and not limitation:

[0014] [Fig-1] Side view and diametrical section view of a telescopic expansion strut in which the connection device is applicable.

[0015] [Fig.2] Plan and sectional view of the device of the preceding figure, at the level of a disc participating in the locking mechanism.

[0016] [Fig. 3] Side view of two props as shown in Figures 1 and 2, connected between them by the device of the invention.

[0017] PREFERRED ESTABLISHMENT OF THE INVENTION

[0018] As can be seen in the figure shown, the invention is applicable to expansion struts comprising two telescopically coupled steel tubes, an inner tube (1) and an outer tube (2). The upper end of the outer tube (2) is integral with a housing formed of two half-housings (10) defining an internal chamber in which are arranged a plurality of steel discs (3-3'), each disc having a central orifice with a diameter slightly larger than that of the outer tube (2). These discs can tilt due to this diameter and have opposing internal projections (4-4') ​​visible in [Fig. 2], passing through corresponding windows (5-5') in the outer tube (2).

[0019] These projections (4-4'), in their internal part, form two circumference segments (13-13') with a diameter slightly greater than that of the inner tube (1).

[0020] The windows (5-5'), also opposite, have different amplitudes. One (5) has a height slightly greater than the thickness of the stacked disks (3-3'), leaving a slight gap for their tilt. The other window (5'), partially aligned superior with the first (5), has a greater downward amplitude, allowing the angular position of the discs to be varied between an inclined position ([Fig. 1 ], blocking position) and a quasi-horizontal position (release position).

[0021] To bring the discs to their locking position, they are stressed by a spring (6) arranged obliquely with respect to the longitudinal axis of the strut.

[0022] To facilitate unlocking, the lower disc (3') has a lateral extension forming a wing (7) serving as a lever, allowing manual grip and joint angular movement with the discs (3) located above.

[0023] The spring (6) is housed in the casing formed by the two half-casings (10), and more specifically in a tubular chamber (8) inclined with respect to the longitudinal axis of the stay.

[0024] The half-casings (10) are fixed by self-locking screws and nuts passing through holes (9). They also have grooves (12) in their upper part, designed to receive an O-ring (11) which rubs against the inner tube (1). Thus, when the mechanism is released, the inner tube (1) descends by its own weight in a controlled manner, slowed by the O-ring, preventing a sudden fall.

[0025] According to the invention, the end of the inner tube (1) of the stay terminates with a threaded orifice allowing two stays to be connected to each other by their opposite inner tubes (1), increasing the operational distance.

[0026] The connecting element (14) is an elongated cylindrical part, having two reverse threads (15) and (16), with an intermediate nut (17) attached to it. This nut constitutes the means of actuating the device: the rotation of the nut (17) simultaneously causes the screwing or unscrewing in the threaded holes of the inner tubes (1) of the two struts, constituting a firm, secure and simple means of joining.

[0027] The threads preferably have a metric Ml6.

Claims

1.

2. Demands Connection device between telescopic tubes of expansion props, prop comprising two steel tubes coupled telescopically, an inner tube (1) and an outer tube (2), with means for selectively locking the inner tube (1) relative to the outer tube (2), the free end of the inner tube (1) having a threaded orifice, characterized in that it consists of an elongated cylindrical piece, having two reverse threads (15, 16), with an intermediate nut (17) attached, the threads (15, 16) conforming to the metric of the threaded orifices of the inner tubes (1) of the props to be connected. Connection device according to claim 1, wherein the reverse threads (15, 16) have an M16 metric.

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