Supports – Pipe or cable – Extending through plate
Patent
1989-08-17
1991-05-14
Ramirez, Ramon O.
Supports
Pipe or cable
Extending through plate
174153G, F16L 500
Patent
active
050149385
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a device for relieving the strain on cables, in particular mains supply cables to housings of electrical equipment, consisting of two parts fitted into one another approximately concentrically of which the outer part can be fastened in the housing opening and the inner part is mounted in the outer part so as to be rotatable around a lead-through opening for the cable, and also clamping fingers which protrude into the lead-through opening, can be swivelled into the lead-through opening by rotation of the inner part relative to the outer part and can be locked in a clamping position.
In a known device of the said type, the inner part has two clamping fingers which are directed inwards and are each moveable about a swivel axis running parallel to the longitudinal axis. The clamping fingers sitting on the inner part, which run up against projections on the outer part, are pressed inwards by rotation of the inner part. This design has the disadvantage that the cable also turns while the clamping grip is being set and shifts from the centre so that a defined clamping grip is not always possible. Furthermore, there is the disadvantage that the inner part has to be rotated through 90.degree. relative to the outer part to produce the clamping grip, i.e. an applied open ring spanner or open-ended spanner has to be swivelled through 90.degree. in order to produce the clamping fit. Since the connections often sit in housing corners or at locations where access is difficult, there is often not sufficient space for a tool movement of 90.degree..
The object of the invention is to design the device of the type mentioned at the beginning in such a way that a reliable clamping grip and a simpler assembly are possible.
According to the invention, this object is achieved when the swivelling direction of the clamping fingers runs approximately transversely to the longitudinal axis of the cable lead-through opening, that the clamping fingers are arranged on the outer part and lie approximately in the direction of the cable lead-through opening, and that run-up lobes for actuating the clamping fingers sitting on the outer part are provided on the inner surface of the inner part.
In the device according to the invention, when the clamping fit is being set, the clamping fingers, which sit on the outer part, do not turn at the same time; on the contrary, only the inner part is rotated, which, with its run-up lobes, presses the clamping fingers against the cable to be secured. In this respect, satisfactory centring of the cable between the clamping fingers is possible without the cable being displaced from its central position while the clamping fit is being produced.
As a result of the design according to the invention, it is also readily possible to provide three or more clamping fingers which are arranged in a uniformly distributed manner over the periphery. Four clamping fingers, each arranged so as to be offset by 90$o@ relative to one another, are preferably provided. Due to the larger number of clamping fingers, absolutely reliable centring of the cable and consequently an optimum fit in the device for relieving the strain are possible.
To secure flat cables, however, only two clamping fingers, which act on the flat sides of the cable, are required.
On account of the design according to the invention, in which the clamping fingers sitting on the outer part are actuated by run-up lobes of the inner part, a very short rotational displacement can be selected to achieve the clamping position, as a result of which the assembly is considerably simplified. In a preferred embodiment having four clamping fingers, a rotational angle of about 45.degree. between the inactive position and the clamping position is sufficient. Also, only a very slight frictional pressure is transmitted to the outer part during the clamping action so that turning of the outer part in a housing bore can be eliminated.
The clamping fingers conveniently sit on the head of the outer part, extend up to the other end of the outer part and
REFERENCES:
patent: 4169572 (1979-10-01), Simon
patent: 4354651 (1982-10-01), Simon
patent: 4432520 (1984-02-01), Simon
patent: 4436265 (1984-03-01), Simon
patent: 4474489 (1984-10-01), Simon
patent: 4839937 (1989-06-01), Oikawa et al.
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