CLAMP FASTENING

Abstract: A clamp fastener for fastening plates (4, 5) e.g. in cabinets containing electronic equipment. The plates (4, 5) are clamped together between the legs of a U-shaped member (1) having converging legs and a round rod (2) disposed in the member. The fastener gives good mechanical and electrical contact along the whole of the contact length of the plates.

Description: CLAMP FASTENING TECHNICAL FIELD The invention relates to a clamp fastening for achieving secure mecha¬ nical and electrical contact between two plates included in a common structure. BACKGROUND ART Modern electronics, e.g. computers and their peripheral equipment, ope- rate more and more quickly. This results in that signals with very high frequencies are processed and transported between and within equipment. The more rapid sequences operations have, the more accentuated is the electromagnetic radiation from incorporated components and wiring. In order to avoid determenental effects of radiation and potential fronts it is necessary to surround circuits and wiring with grounded metal casing. In grounding metal casings or cabinets surrounding circuits emitting electromagnetic radiation, it is known that poor electrical contact between two individually grounded plates results in radiation from the joints between the plates. In rigid joints, the problem can be avoided e.g. by welding the plates together. Screwed connections are often used for dismantlable fastenings. For improving the electrical contact it is known to arrange sealing strips between the plates, e.g. of electrically conductive rubber. Known methods of guaranteeing good electrical contact between dismantable plates in metal cabinets are either laborious (screws sitting closed) or expensive ( electrically conductive rubber strip ) . DISCLOSURE OF INVENTION The present invention relates to an effective and practical aid in pro¬ viding a substantially uniform pressure between two plates along the whole of their length of contact, thereby achieving good mechanical and electrical contact between the plates. OMPI DESCRIPTION OF FIGURE The invention, the characterizing features of which are disclosed in the following claims, will now be described in detail with refe¬ rence to the accompanying drawing illustrating in cross section a joint between two plates, made with the aid of the clamp fastening. PREFERRED EMBODIMENT In cross section, the drawing illustrates an embodiment of a fastener in accordance with the invention. Two plates 4 and 5 are surrounded along their common Length by a U-shaped member 1. Due to the legs of the member 1 converging towards the Longitudinal opening of the member, the distance between a round rod 2, disposed in the member along its . length, and the legs of the member will vary with the distance of the rod 2 from the longitudinal opening of the member. With the aid of screws 3 disposed at suitable spacing along the member, the rod 2 can be displaced in its transverse direction, thereby to clamp the plates 4 and 5 with a wedge action. The pressure obtained in this way bet- ween the plates 4 and 5 has been found to result in an excellent elec¬ trical "sealing" of metal cabinets while a good mechanical joint is ob¬ tained at the same time.

Claims: CLAIMS 1. A clamp fastener for clamping together at least two plates, characterized in that the fastener includes a member (1) having a U- shaped cross section, the legs of which converge towards each other and are intended to extend over the plates (4, 5) which are to be connected to each other, and a rod (2) intended to engage under pres¬ sure against one of the plates ( 5 ) and one leg of the member (1) with the aid of at least one pressure means (3) arranged in the member and dis- placeable transverse the rod (2) such that the plates (4, 5) are clamped between the rod (2) and the other leg of the member (1). 2. Clamp fastener as claimed in claim 1, characterized in that the pressure means (3) consists of a screw threaded into the member (1) and engaging with its end against the rod (2). 3. Clamp fastener as claimed in claim 1, characterized in that one leg of the member (1) is approximately at right angles to the central part of the member while the other leg forms an acute angle to the central part. 4. Clamp fastener as claimed in claim 1, characterized in that both legs of the member (1) form acute angles to the central part. SUΪtAT OMPI

Inventors: KARLSSON BO AOKE EMANUEL, KARLSSON, BO, AOKE, EMANUEL
Applicants: ERICSSON TELEFON AB L M, TELEFONAKTIEBOLAGET LM ERICSSON
Application year: 1983
Main classification: F16B2
IPC codes: F16B2, H05K7