DE202006006641U1 - Cord grip for use in electronic ballast case, has holder connected with base part and attached to part that is pivotable with pivotable end, where holder has lever that is shifted from center of line - Google Patents

Abstract

The grip has a holder (12) connected with a base part (4) and attached to the part that is pivotable with a pivotable end. A removable attachment end is connected with the part and has a holding area that is designed between the pivotable end and the attachment end. A line is clamped with an arrester by the holding area in a closing position, where the holder has a lever (32) that is shifted from the center of the line.

Description

The The invention relates to a strain relief with a base part, the one Counterholder for having the fixation of a line, and one with the base part connected hangers, the pivotally mounted with a pivot end to the base part is, a solvable connectable with the base part attachment end and an intermediate Having the pivot end and the mounting end formed holding area, with the line in the closed position can be clamped with the counter-holder.

Strain reliefs of the type mentioned are known in numerous embodiments. According to the valid VDE-guideline, the cable fixed by the strain relief or the cable pull with a cross-section of 5-8mm ^{2 has to} withstand a tensile strength of 120 Newton and a torque of 0,35 Nm. To realize the corresponding fixing or pressing force for clamping the line, a contact pressure of 300 Newtons is required.

at Existing strain reliefs are extremely difficult to do this closing force to fix the line. Smaller or weaker persons can the temple only with difficulty in the closed position fix. Applying the necessary force is especially difficult when these in confined spaces or overhead mounting exercised shall be.

Of the The invention is therefore based on the object, a strain relief of the type mentioned in such a way that the beginning mentioned disadvantages are at least partially avoided and in particular provide a strain relief, in which the implementation of the VDE directive required closing force easy and under difficult installation conditions can be applied.

According to the invention this Task in a strain relief of the type mentioned by solved, that the hanger comprises a lever arranged offset from the line.

Of the inventive lever enabled by the strap the offset from the cable center arrangement applying a considerable torque, so that a lower clamping force is needed. In installation position, the lying between the bracket and the base part Lead through the holding area of the bracket and the counterholder of the Base part clamped. In the installed position, the leverage laws act due to of the offset from the cable center lever levers and allow such a comfortable operation.

During the activity of the temple this is placed on a circular path around the pivot end of the bracket. The between the hanger and the base part lying line is through the holding portion of the bracket and the counter bearing of the base part clamped.

The Base part and the hanger are preferably made of plastic (PC, PA, PPT, POM and others suitable plastics which have sufficient toughness, heat resistance and longevity).

Preferably the lever is in one piece on the temple formed. However, it can also be used as a separate lever for later Space-saving assembly be formed.

Especially advantageous and space-saving is a crescent-shaped design of the bracket.

In a preferred embodiment the base part has a bearing eye for rotatably receiving the rotating end of the temple on. In this bearing eye can Bearing journals of the bracket be caught snapping.

The strain relief according to the invention can be integrated in a complex component. So can for example the base part part of a lamp body, a ballast box or the like.

Preferably has the hanger a toothing which can be locked with the base part for receiving different sizes Cables in the strain relief. For this purpose, the base part has a corresponding latching area, which is complementary to the Toothing of the temple is trained.

In In a further development, the bracket may comprise a solvent with which this is particularly easy to solve from the closed position. As a particularly advantageous has a beak-shaped extension exposed at the attachment end, which is a lifting surface for Lifting the attachment end provides to the strap the closed position to solve.

When has proven particularly advantageous to break off the bracket with a Integration of the base part or the complex component to integrate.

Further Details, advantages and features of the invention can be the refer to the following part of the description, in which an embodiment the device according to the invention closer to three figures explained becomes. The drawings show:

1 a perspective view of a ballast box with the strain relief according to the invention;

2 an enlarged perspective view of the strain relief according to the invention when closing; and

3 an enlarged front view in section of the strain relief according to 2 in closed position to illustrate the leverage.

The one in its entirety 2 characterized ballast box consists of a plate-shaped base part 4 , on one side of a domed cover 6 is pivotally mounted. Inside the ballast box 2 are arranged electrical units for the operation of discharge lamps, such as an electronic ballast 8th , For the operation of this ballast 8th Different lines are required to the ballast 8th lead and depart from this. These cables are in the ballast box 2 by the strain reliefs according to the invention 10 fixed.

The strain reliefs 10 each include one with the base part 4 pivotally connected and crescent-shaped bracket 12 pivotable with a pivot end to the base part 4 is attached. Furthermore, the bracket includes 12 a detachable with the base part 4 connectable attachment end and formed between the pivot end and the attachment end holding portion. With this holding area is a line 20 with a counterhold 22 on the base part 4 clamped so that the required for the implementation of the VDE guideline fixing force of 300 Newton to meet the test conditions (120N, 0.35 Nm with a wire cross-section of 5-8mm ² ) is applied.

The base part 4 has both sides of the counter-holder 22 Receiving means for the hanger 12 on. On the one hand, these receiving means consist of integrally molded Einsteckdomen 24 , which bearing eyes for rotatably receiving trunnions at the pivot end of the bracket 12 exhibit. On the of the counterpart 22 opposite side has the base part 4 a detent opening 28 into which the attachment end of the bracket 12 can be inserted in the installation position. The coat hanger 12 has inside a stepwise toothing 28 on that with a corresponding to the base part 4 molded locking lip 30 in a known manner in the closed position an operative connection for fixing the bracket 12 at the base part 4 received.

In the 3 is the inventive arrangement of the piece on the bracket 12 molded lever 32 particularly recognizable. Accordingly, the lever 32 radially projecting on the crescent-shaped bracket 12 molded on and has on its upper side a pressure surface for pressing with a thumb or Finder. The lever 32 is offset from the middle of the line 20 arranged and therefore exercises according to the "nutcracker principle" when closing a particularly favorable leverage on this midpoint of the line 20 out. These leverage forces allow the necessary closing force of 300 Newton to be easily and effortlessly applied to the line 20 to apply these to the base part 4 to fix.

The crescent-shaped bracket according to the invention with the lever 32 enables the implementation of two main advantages: the lever principle for realizing the required closing force; on the other hand, the wedge principle (jamming / deformation of the cable by wedging action of the clamping portion of the bracket 12 ). As can be seen, the clamping area of the bracket 12 on both sides adjacent to an upper circle section 36 two lateral, contact surfaces 38 . 40 on. These contact surfaces 38 . 40 are preferably formed linear and form the actual clamping region of the bracket 12 , Due to the selected training the center of the circular section of the clamping area runs on a circular path around the fulcrum (bearing eye) of the bracket 12 , This results in almost constant clamping conditions with different cable diameters. At the same time this has a self-centering effect on the line and causes uniform clamping forces.

A connection of the strap 12 at the base part 4 exclusively by means of a film hinge, as in the prior art, could by the inventive design of the bracket 12 namely, not withstand forces acting on the bearing eye. For this reason, the bearing eye must be suitably stable designed to accommodate larger forces and has to accommodate these forces on the base part of the Einsteckdome 25 for receiving the journals of the bracket 12 intended.

Finally, the hanger points 12 a beak-shaped extension 34 at the attachment end. This provides a gripping surface for a finger to release the locking connection between the bracket 12 and the base part 4 ready

Of the The subject of the present invention is not exclusive the subject of the individual claims, but from the combination the individual claims among themselves. All information and characteristics disclosed in the documents, in particular the spatial illustrated in the drawings Training, are claimed as essential to the invention, as far as individually or in combination with the prior art are.

2

Ballast

4

base

6

cover

8th

ballast

10

Strain relief

12

hanger

20

management

22

backstop

24

Einsteckdom

24

latching opening

28

gearing

30

Rest lip

32

lever

34

renewal

36

circular section

38

contact surface

40

contact surface

Claims (12)

Strain relief with a base part ( 4 ), a counterpart ( 22 ) for fixing a line ( 20 ), and one with the base part ( 4 ) connected brackets ( 12 ) pivotable with a pivot end to the base part ( 4 ), one releasably connected to the base part ( 4 ) connectable attachment end and a formed between the pivot end and the attachment end holding portion, with which the line in the closed position with the anvil ( 22 ) can be clamped , THAT CHARACTERIZED that the bracket ( 12 ) puts a lever from the middle of the pipe ( 32 ). Strain relief according to claim 1, characterized in that the lever is integral with the bracket ( 32 ) is formed. Strain relief according to one of the preceding claims, characterized in that the yoke ( 12 ) is sickle-shaped. Strain relief according to one of the preceding claims, characterized in that the base part ( 4 ) is provided with a bearing eye for rotatably receiving the rotary end. Strain relief according to one of the preceding claims, characterized in that the base part ( 4 ) Is part of a more complex component. Strain relief according to one of the preceding claims, characterized in that the yoke ( 12 ) Bearing journals, which with the bearing eye of the base part ( 4 ) are locked. Strain relief according to one of the preceding claims, characterized in that the yoke ( 12 ) a gearing ( 28 ) having. Strain relief according to one of the preceding claims, characterized in that the yoke ( 20 ) has a solvent. Strain relief according to claim 8, characterized that the solvent as beak-shaped renewal is formed on the attachment end. Strain relief according to one of the preceding claims, characterized in that the yoke ( 12 ) can be integrated into a complex component with a connection to be broken off. Strain relief according to one of claims 3 to 10, characterized in that the yoke ( 12 ) on the inside a clamping area with mutually spaced contact surfaces ( 38 . 40 ) having. Strain relief according to claim 11, characterized in that the contact surfaces ( 38 . 40 ) are linear.