DE7721692U1 - Grommet - Google Patents

Description

DR.-ING. EUGEN MAlER DR.-ING. ECKHARD WOLF

PATENT LAWYERS

DRESDNER BANK AG

PHONE; (0711) 2 * 2761/2 STUTTGART NO. 192O534

TELEGRAMS: MENTOR 7 STUTTGART 1, PISCHEKSTR. 19 POSTSCHECK STGT. 25300-70 »

Λ 12 035 June 20, 1977 f - kt

AB Lyckeaborgs Bruk

S-37100 Karlskrona (Sweden)

Grommet

The innovation concerns a grommet for the fireproof and gas-tight implementation of an uneven or having a rough surface, preferably consisting of several twisted and twisted lines Cables through walls, stone walls or concrete walls.

When passing cables or wire harnesses through Up to now, finished wall, concrete or stone walls were usually carried with every cable at the point of entry Flax or the like. wrapped before one. introduced it into a wall opening provided for this purpose. After that it was still open part of the opening with bitumen or similar

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Mass that first had to be heated, filled in. Since with larger structures a larger number of such Executions occurs, this procedure was very cumbersome and time-consuming and accordingly with associated high costs. In addition, these cable bushings were mostly not sufficiently fire-proof.

The innovation is based on the task of creating a grommet of the type described above, with the special a tight and fireproof cable bushing can be produced easily and without great effort.

To solve this problem, a grommet is proposed according to the innovation, which consists of at least two in the longitudinal direction separated into a closed structure with a cylindrical or frustoconical surface Complementary parts are composed of an elastic material that swells when exposed to heat exist.

The measures according to the innovation enable a particularly simple and reliable assembly by initially the grommet halves are applied from the side onto the gable, forming a grommet that tightly encloses the cable and then the cable together with the grommet

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be inserted into a corresponding wall opening. When it is inserted into the wall opening, the grommet is compressed somewhat so that it presses against the surface of the cable to form an airtight seal. Due to the properties of the grommet material, which swells when exposed to heat, the wall opening remains hermetically sealed in the event of a fire, even if the sheath and insulation of the cable are destroyed. This effectively prevents the fire from spreading through the wall opening.

• According to a particularly advantageous embodiment of the As a novelty, the sleeve parts have radially inwardly directed flanges on their end faces a trough-like recess is formed which can be filled with a resilient sealant. At the side When the grommet parts are pressed against the surface of the cable, the sealant hugs itself while filling the unevenness sealing. Silicone rubber, for example, can be used as a sealant.

In the drawing, a preferred embodiment of the innovation is shown in a schematic manner. Show it:

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Pig. 1 a top view of the rear face of a two-part grommet;

FIG. 2 shows one of the sleeve parts according to FIG. 1 in a diagrammatic representation.

The grommet shown in the drawing is in the longitudinal direction along the surface 2 in two equal parts 4,4 ' divided. The outer surfaces of the sleeve parts 4, 4 ′, which are semicircular in cross section, are on one end face of one outwardly protruding semicircular flange 8, while the inner surfaces 10. on both end faces limited by inwardly protruding semicircular flanges 12,14 with the formation of a trough-like depression are.

The two sleeve parts 4,4 'can be seen from the side like this be applied to a cable, not shown, that it becomes a closed grommet with a frustoconical Complete the outer surface 6 and the circular cylindrical inner surface. Previously, the tub-like depressions with a resilient sealant, for example made of silicone rubber, filled in when pressed onto the cable into the unevenness of the cable surface penetrates and tightly encloses the cable. The grommet, together with the cable, can then be inserted into a pre-drilled wall

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Opening are pressed in until the outer flange 8 rests against the wall surface in question. With accordingly narrow wall opening, the grommet is slightly compressed and pressed against the cable surface, whereby a good seal is achieved.

The sleeve parts are made of a material that swells when exposed to heat, so that in the event of a fire The wall opening remains hermetically sealed and the fire is prevented from spreading through the wall opening itself if the sheath and insulation of the cable should be destroyed.

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Claims (5)

ι ι · A 12 085 6/20/1977 - 1 - f - kt protection claims 1. Grommet for the fireproof and gas-tight implementation of an uneven or rough surface, preferably made of twisted or twisted cables through walls, Stone walls or concrete walls, gel-marked by at least two lengthways & directions, becomes a closed structure with a cylindrical or frustoconical outer surface '(6) complementary Spout parts (4,4 '), which are made of an elastic material that swells due to the action of heat. 2. Spout according to claim 1, characterized that a resilient sealant is applied to the inner surfaces (10) of the sleeve parts (4,4 ') is. 3. Grommet according to claim 2, characterized in that the sealant consists of silicone rubber. -2- 7721692 10/20/77 I IM I · · Λ .1.2 00 5 20.C.] 977 - 2 - f - kt 4. Spout according to one of claims 1 to 3, characterized characterized in that it has a circular internal cross-section. 5. Spout according to one of claims 1 to 4, characterized characterized in that it has a radially inwardly facing flange on at least one end face (12,14). 7721692 10/20/77