SE517366C2 - Safety device for preventing electric cable being pulled out, comprises fixed and movable parts with flanges for fixing cable in position - Google Patents

Abstract

The safety device (1) comprises a fixed part (3) joined to a movable part (4) which combine to form a cable passage (18) extending though the device when it is closed. The cable is fixed in position inside the passage by inwards pointing flanges (12-17) or sections thereof provided on both parts, without it being bent.

Description

25 'so Juan: | ~ »; | 'f 35 517 36-6 2 insertion direction. Another object is to always have the same mechanical impact on the cable for a given cable, regardless of the tightening torque on screws or similar factors.

Strain relief according to the invention has the characterizing properties which appear from claim 1. Further embodiments of the invention have the characteristic properties which appear from other patent claims.

The invention will be described in more detail in the following with reference to the exemplary embodiments which appear from the appended diagrams.

Figure 1 shows an opened strain relief according to the invention.

Figure 2 shows the strain relief seen from above.

Figure 3 shows the strain relief in section.

Figure 4 shows the opened strain relief seen from the side.

Figure 5 shows the strain relief from the opposite side.

Figure 6 shows another embodiment of the invention.

The strain relief 1 has a fastening part 2 which is hereinafter referred to as the lower part. Furthermore, the strain relief has a first upper part 3 which is fixed in relation to the lower part and is preferably made in one piece with it. Movably connected to the first upper part is a second upper part 4. The two upper parts 3, 4 are preferably connected to each other by means of a hinge joint 5. In a preferred embodiment of the invention, the parts of the strain relief and the hinge joint are made in one piece by injection molding of plastic material . At the hinge joint, the two upper parts each have a reinforcing and spacer part 6, 7. Central in the lower part is a through hole 18 which also extends through the upper part when it is closed and is formed by the abutting parts 3, 4. .

The strain relief is shown in Figure 3 with the two upper parts 3, 4 in the closed position in the same position; »Lance 517 366 which a cable which is passed through the strain relief is held, in the other visas gures the parts are shown in open position in open position for insertion of cable.

The lower part 2 of the strain relief 1 is suitably designed for attaching the strain relief to an apparatus, luminaire or other device. For this purpose, the lower part 2 is preferably provided with a thread which may be internal according to the embodiment in Figure 6 or external in the embodiments according to other figures. Other fastening devices are also possible, for example fl pens or snap devices.

In order to keep the two upper parts 3, 4 in closed position relative to each other, in the embodiment shown in the figures there is a snap lock with a hook 8 and a corresponding hole 9. The hole 9 is continuous and the outer surface 10 of the hook 8 is designed so that it coincides with the surface of the upper part 3 when the strain relief is closed.

For holding a cable which is passed through the hole 18, a plurality of pairs 12-17 arranged in pairs are arranged in the upper part of the strain relief. In the embodiments shown in the figures, pairs 12, 13 are arranged in their entirety in the upper part of the fixed, upper part 3 near the opening of the hole 18 and two further pairs 14, 15 and 16, 17 are arranged in the movable, upper part 4 further down in the hole 18. The cable is passed with the strain relief in the open position according to Figure 1 through the lower part of the hole 18 in the lower part 2 of the strain relief and when the cable is in the desired position it is pressed in between the upper ends 12, 13. Because these are located at the upper side of the upper part, the cable penetration can take place without difficulties or obstacles on the sides.

Then the strain relief is closed, ie. the upper, movable part 4 is rotated in the joint 5 towards the fixed, upper part 3 and snaps with the snap device 8, 9.

In this case, the cable will be inserted and clamped between the two pairs of ends 14, 15 and 16, 17 which are arranged in the movable part 4. The cable is then held in a certain position and cannot be pulled out of the strain relief regardless of in which direction any tensile forces affect the cable, the strain relief is bidirectional .. |., »| The strain relief described above is made in one piece with a fixed and a movable part which are held together by a hinge joint 5 which forms an integral part of the strain relief and is made of the same materials such as the strain relief in general. The entire strain relief is made in one piece, which facilitates both manufacture and use. Because the fl ends are fixedly arranged in the strain relief, the impact on a certain cable is always the same and is not affected by the tightening torque for fastening screws and the like. Another advantage is that the cable is pulled through the center of the strain relief without being bent in the mounted position. Within the framework of the inventive concept, embodiments other than those described above are possible. For example, one or more of the ns ends 12-17 can be divided so that a part of the respective fl ends is included in the fixed upper part 3 and another part of the same ingår ends is included in the movable upper part 4. The flanges can also be displaced relative to each other, partly in pairs and partly within each pair of facing ns ends, which may mean that the two fl ends in a pair are not placed opposite each other in the longitudinal direction of the hole 18. -øovv

Claims (4)

10 15 20 PATENT REQUIREMENTS. Strain relief for cable gland, characterized in that it comprises a lower, non-openable part with a first part of a through hole (18) and an upper part which in itself comprises a part (3) fixedly fixed to the lower part (2) and a part (4) with this movably connected part which in abutting, closed position delimits the continuation of the through hole (18), both parts having in the hole (18) directed, paired fl ends (12-17) or parts of fl ends which bi-directionally retain a cable passed through the hole (18) without deflecting it. Strain relief according to claim 1, characterized in that in the fixed part (3) fl ends are arranged only near the free opening of the hole (18). Strain relief according to one of the preceding claims, characterized in that each ns end (12-17) is arranged in its entirety in only one of the mutually movable parts (3, 4). Strain relief according to one of the preceding claims, characterized in that the grooves are arranged in pairs opposite one another in the longitudinal direction of the hole (18).