DD276333A1 - RIBBON FOR PIPE-TERM CARRYING STRUCTURES, ESPECIALLY FOR LUMINAIRES - Google Patents

Abstract

The invention relates to a friction joint for rohrfoermige supporting structures, in particular for supporting structures of lights and other electrical devices. The object of the invention is to increase the reliability of current-carrying supporting structures rohrfoermigen cross-section with friction joints and to reduce the manufacturing and assembly costs. This goal is achieved in that the consisting of two joint shells Reibgelenkendstückck Kraft- and formschlüssssig summarizes and defines the cable exiting the tube labyrinthine and thus strain-relieved and protective insulated leads out of the support system.

Description

For this 1 page drawings

Field of application of the Erflndunc

The invention relates to a Reibgolenk for tubular support structure, in particular of lights, such. B. of table and task lights.

Characteristic of the known state of the art

There are friction joints are known in which the cast to be wound pipe with its end in the hinge material or clamped between two joint halves.

In such a joint, which is preferably used for table, work lights and other electrical equipment, the Quelenkhälften consist of two half-shells, which are zusammongespannt by a screw.

An improved version of such a joint is evident from (DD 230058). It is a joint for lights with two mutually rotatable joint halves in pot form, which are provided with attachment or connection parts for lamp arms, the lamp base or the lamp housing and with a holding together axle piece.

This joint is further characterized in that the axle piece is connected on one side via a Hirth toothing with a joint half and on the cylindrical projection of the axle piece between the hinge halves a spring and a sliding disk are arranged, the axle pieces are connected to a screw and a nut and between the hinge halves at the periphery of a Gleitdichtring is provided.

Although this joint is characterized in that a high degree of protection for the guidance of the electrical lines is achieved within the joint, the main concern of the same is that the torque in one of such range and is adjustable, on the one hand caused by different lengths of pipe boom different mass forces and possibly by Vorschleißerscheinungen changed friction forces can be taken into account.

An integrated strain relief, however, does not have this joint.

It is also known a tiltable floor lamp, which consists of a telescopic column with at least inter-rotating tubes of any cross-section, of which the outer, displaceable tube assigned via a connec the head and the inner, fixed tube via an intermediate piece on a disposed within the Standfußas and means a screw ring fixable joint ball is firmly connected. A detachable connection consists in the fact that the outgoing from the lamp head electrical cable is arranged as a retractable coil within the column and is discharged through a strain relief through the ball joint together with the base through to the outside.

The arrangement of a washer serves as a train protection for the electrical cable, which through a center hole of the Ball stud and the ball over an elastic nipple passes through to the outside. Although the arrangement of a strain relief in a joint already emerges from DE 2643780, this is true

this is a ball joint with a completely different from the invention execution. The provided therein

Strain relief is' adapted to this other construction and therefore has a completely different structural design. It is also not an integral part of the joint itself. Furthermore, a rotary joint for workplace lights with tubular Leuchtengestoll has become known, consisting of two

topfförmigon joint halves, which form a capsule, randrräßig glide on each other and by means of screws under

Spring pressure to be maintained. The one of the two hinge halves has in continuation of the inner wall a raised web, in a Soil hole of the other joint halves dips. The electrical line can be in a fairly large free space twice

angled be supplied to the lamp.

The main concern of this DD 21508 is the ois existing cramped conditions regarding the Improve cable routing and placement in joints. This is achieved in that the cable is a large space is created, so that an unobstructed supply to Lamp can be done. However, this joint is not designed in its structural design to the interests of a strain relief. A labyrinthine, insulated strain relief, which is an integral part of the joint itself. goes from this DD 21508

not apparent.

Although there are already known strain relief, which are designed in the form of a labyrinth, but this is about Cable entries where the cable z. B. by means of a tüllenförmigen Plastformteils in the radial tube insertion into a Labyrinth forced and thus insulated isolates strain relief. (DD 253717) There are also devices for draft-free insertion of the electric cable in a device under deflection of about 90 °

known, in which the cable under deformation between a the insertion hole in the device covering, at least one

Clamp rib having, designed as a cup-shaped clamping lid first clamping element and a second Clamping element can be clamped, wherein the cup-shaped clamping lid has a lateral cut to the passage and the

additional jamming of the cable has (DE-OS 2141064).

In an improved embodiment of this device, the second clamping element consists of a fixable in the device, with

the clamping cover connected via screw, the cable enclosing threaded sleeve with external thread (DE-PS 3108085).

These angular strain relief devices can be used both in thin sheet metal walls and in thick-walled device housing

be introduced, an application in joints for supporting structures is not possible.

There is also a connection and Vertoilorstück with strain relief in electrical cable connections become known with

a housing enclosing the juncture between the incoming and outgoing cable cores, consisting of a flat bottom portion and a flat ceiling portion, the bottom portion projecting upwardly toward the interior of the housing

Webs and these are provided in the cover part opposite projections. This training will be in the connector Labyrinth gears created that serve to strain relief of the electrical line (DE-AS 2310366). Meets this design

the same with what has already been explained in detail above, d. h., That an application of this labyrinth in friction joints for

Supporting structures of lights is not possible. In the known cable entries, the electrical cable is usually without mechanical protection through the hole in the

metallic pipe cross section introduced. By bending the cable there is an increased pressure of the

Cable insulation on the metallic pipe jacket. The plastic moldings used are usually frictional and positive locking (ζ. Β. Noses in holes) axially mounted on the pipe cross-section. This can lead to failure of the positive connection to a Shearing stress of the cable come at the metallic bare bore. Furthermore, the radial pipe bores cause a reduction in strength of the supporting structure. Because the Strength reduction usually occurs at the pipe ends and thus at the points of highest bending stress are

these structural areas in particular. s vulnerable to breakage.

The functional safety of most strain reliefs depends on the careful assembly of the components. Likewise will

the failure of a cable relief and the associated risk from the operator usually not recognized immediately.

The discrete structure of Kabefzugentlastung and friction joint requires a high component and assembly costs. Object of the invention

The object of the invention is to increase the reliability in current-carrying support structure tubular cross-section with friction joints and reduce the manufacturing and Montageaufwano 'tu.

Presentation of the essence of the invention The invention has for its object to develop a friction joint, while ensuring full reliability

and mounting capability to meet the requirements of unobstructed, strain-relieved cable management with full insulation and additional kink protection.

According to the invention, this object is achieved in that the consisting of two joint half-shells the friction joint Cartridge end positively and positively engages and defines the emerging from the tube cable labyrinthine and thus

relieved of strain and leads out of the support system.

Dfb joint half-shells can consist of two plastic parts. The kink protection can here by generous radii

the cable entry opening or by additional attachment of an insertion grommet can be realized.

The preferably two-part friction joint can be pre-assembled with a screw. However, this screw may be included

immediate final assembly omitted.

The invention will be explained in more detail with reference to an embodiment illustrative drawing. Show it:

1: a side view of the friction joint in the opened state FIG. 2: a section A-A according to FIG. 1.

The friction joint according to the invention consists of two half-shells 1.2, the force-fit and form-fitting fix in its position during assembly and lead the cable 3, and 3 'via a labyrinth outwards, creating a strain relief and protective insulation against the metallic Tube is effected.

The position fixation of the support tube end piece 4 takes place at both half-shells 1.2 by cylinder half holes 6 and a web 7. Positive locking against rotation or withdrawal is generated by a nose 9 and corresponding holes on the bending unloaded edge of the support tube end piece 4.

An optimal clamping of the support tube end piece 4 comes about by creating a statically determined three-point support when biasing the two half-shells 1.2. To bear this case come the cylinder half-holes 6, the web 7, and another, diametrically to the normal force FN generated from a screw 5 and another screw 8 resulting clamping force golegener base.

This base should be as far away from the resulting clamping force and is realized at the joint half shell edge by a column 10.

The labyrinth for strain relief of the cable 3, or 3 'is formed by columns 12,13 and the supporting column 10 and the wall 11 of the hinge half shells 1, 2. For the optional use of different cable cross-sections, the labyrinth can be extended by the arrangement of an additional column 14. The column 13 is designed in its shape and position so that the axially emerging from the support tube end 4 cable 3,3 'comes tangentially to the plant to avoid edge pressure on the metallic pipe end.

To facilitate the cable assembly, the columns 10,12,13,14 protrude into the other joint half-shell after final assembly. Both joint half-shells 1, 2 can be braced against one another by the selective use of the screw 5 in the sense of an assembly pre-assembly.

This screw 5 can be omitted if the friction joint is assembled by the application of the operationally required generated by the screw 8 normal force FN.

The frictional torque of the joint co-determining friction diameter can be formed on both half-shells 1.2 by Anformungan 1 a, 2 a.

If required, a special Kabelknickschutz be attached to the cable outlet opening 15.

A sufficient Kabelknickschutz is ensured by appropriate radii at the cable outlet opening 15.

For operational protection of the cable 3,3 'is on both Gelnnkhalbschalen 1,2 a stop 1 b, 2b formed to limit the rotation.

Claims (7)

1. friction joint for tubular support structures, in particular of lights, z. As table and task lights and other electrical equipment, which consists of two mutually braced and held together by a screw joint halves, between which the serving to guide the electrical cable pipe end is clamped provided, characterized in that the two joint half-shells (1,2) for fixing the position and optimal clamping of the support tube end piece (4) are provided with a clamping device and for kink-free strain relief of the electrical cable (3, 3 ') have a labyrinth, wherein the clamping device of a cylinder half-bore (6), a web (7), a nose (9) and a column (10) and the labyrinth is formed by projecting columns (10, 12, 13). 2. friction joint according to claim 1, characterized in that for adaptation to different cable cross-sections, the labyrinth of the columns (10,12,13,14) and the wall (11) is formed. 3. A friction joint according to claim 1, characterized in that the two joint half shells (1, 2) either for the purpose of assembly pre-assembly or to increase the clamping force on the support tube end piece (4) by a screw (5) are interconnected. 4. friction joint according to claims 1 to 3, characterized in that attached to the cable outlet opening (15) for additional kink protection either large radii or a cable grommet are attached. 5. friction joint according to claims 1 to 4, characterized in that the two joint half-shells (1,2) for the purpose of a defined Reibgelenkvorhaltens with projections (1 a, 2 a) are provided. 6. A friction joint according to claims 1 to 5, characterized in that for operational protection of the cable (3,3 ') against shearing either at both hinge half shells (1, 2) a stop (1 b, 2b) is mounted to limit the rotation. 7. friction joint according to claims 1 and 2, characterized in that for ease of cable assembly, the columns (10,12,13,14) of the joint half-shell (2) protrude into the joint half-shell (1) after final assembly.