FI59313C - FAESTKROPP FOER EN LEDNINGSKANAL AV METALL - Google Patents

Description

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PatMtti. j * the Registry Board (44),. k «, Multabu"

Patant- och registerstyrelten An »6k» n utligd och uxl.ikriften publkund 31.03.81 (32) (33) (31) P) 7 <l * tty «tuolkuu · -« «gird prloritut (71) Oy Nokia Ab, Pursimiehenkatu 29 ~ 31> PL U-19, 00101 Helsinki 10,

The present invention relates to a fastener for a metal conduit. The present invention relates to a fixture for a metal conduit. , the fastening piece comprising a U-shaped body, both arms of which form gripping hooks which can be placed behind the support shoulders in the guide channel, the at least one branch being provided with a locking tongue of rigid material which can be bent behind the counter-shoulder in the guide channel.

It is previously known to attach so-called devices for the installation of electrical and telephone lines and the like. cable ducts to office walls or other support surfaces with separate fastening pieces to which the cable ducts are fastened by means of support shoulders formed on their backs. It has been proposed to make at least one branch of the fastening piece slightly flexible, so that the gripping hook of this branch snaps into place with the support shoulder of the guide channel when the guide channel is pressed against the fastening piece. However, the flexibility of the branch of the fastening piece contradicts the support and fastening function of the fastening piece, according to which the branch should be as rigid as possible, but at the same time somewhat flexible. Rigid-branch fasteners are also known, but the fastening of the cable ducts to them then requires 5931 3 fastening screws or similar tightening members. However, the mounting screws are difficult to access because they are located in very tight spaces behind the back of the conduit.

It is also known in the past to form a special flexible locking member on at least one branch, so that the branch itself can be made sufficiently rigid and no separate tightening screws or the like are required. However, the flexible locking tongue cannot be easily bent into the locking position, i.e. on the occasion with the guide channel, due to the above-mentioned tight spaces.

The object of the present invention is to provide a fastening piece which eliminates the above-mentioned drawbacks, and this object is achieved by a fastening piece according to the invention, characterized in that a branch is provided in the branch with a locking tongue to provide a support point for a lever bending tool.

Thanks to the structure according to the invention, the locking tongue can be bent into the locking position simply by means of a screwdriver, for example, because the abutment formed on the branch provides a support point for the tip of the screwdriver and allows the screwdriver to be used like a lever. There is usually only a narrow space behind the back of the cable duct, which, however, still fits well with the tip of a screwdriver or the like. Thus, bending the locking tab does not require any special tools, but is handled by a tool that is used by every installer.

The invention will be explained in more detail below with reference to the accompanying drawing, in which Fig. 1 shows a cross-section of a fastening piece according to the invention and a guide channel fastened thereto, Fig. 2 shows a part of the fastening piece and guide channel in the locking tab fastening step,

In Figures 1 and 2 of the drawing, reference numeral 1 generally shows a fastening piece and reference numeral 2 a conduit, which may be, for example, of the type disclosed in the applicant's earlier patent application No. 783592. The fastening piece is U-shaped in cross-section, comprising a web 3, from which the fastening piece is fastened to a wall 1 »or similar base, and two rigid arms 5, 6. At the outer end of each leg there are parallel gripping hooks 7.

A protruding locking tab 9 is formed on the underside of the lower leg 6 of the fastening member. A rib 10 protruding from the locking tab is also formed at a distance from the underside of the arm 6.

5931 3

In order to fix the cable duct in place, the fastening pieces are first fastened to the wall with screws 11 at a suitable distance from each other. The guide channel is then placed on the gripping hooks T of each fastening piece with its support shoulders 8. Finally, the tip portion of the screwdriver 12 is inserted between the locking tab 9 and the rib 10 and the locking tab is pressed toward the back of the conduit by the lever movement of the screwdriver. The tip of the screwdriver then rests on the rib, so that the locking tongue is bent at its tip in the grip with the counter-shoulder 13 in the guide channel, as shown in Fig. 2. The mounting chute is thus prevented from coming loose from the fastening piece.

Instead of a rib 10 in the branch of the fastening piece, a recess 10 'may be formed in the branch. The fastening piece is preferably formed by a truncated part of the profile bar.

The details of the fastening element according to the invention can vary considerably within the scope of the claims. The drawing and the related explanation are only intended to illustrate the idea of the invention. Thus, the shape of the locking tab may vary. A locking tongue can also be formed in the second branch.