Electricity: conductors and insulators – Insulators – With insulator-supporting or attaching means
Patent
1984-03-12
1985-12-17
Askin, Laramie E.
Electricity: conductors and insulators
Insulators
With insulator-supporting or attaching means
174149B, 174174, H01B 1718, H02G 500
Patent
active
045594139
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a rail insulator for the securing of conductor rail on a rail support.
Many different forms of rail insulators are known for the building up of rail areas, for example for use in metal-enclosed electrical systems and in power supply installations of similar kind. The rail insulator in accordance with the invention finds application not only in the supply of current or the distribution of power, but also for pilot wires and control leads, for example such as those used in electrical installations in various concerns and the like.
As disclosed in British Pat. No. 1,085,372, a module building set is known for the building up of electrical rail areas by the assembling together of rail supports and insulators. The rail supports have notches in which the insulators are placed. One must thus have different supports, all depending on how many conductors there are to be used in the actual installation, and if many conductors are to be led forward, it is easy to obtain a mechanical construction which is not strong and stable enough if great changes occur in the current in the conductors, in that the dynamic forces must be transferred by the rail supports.
From the Swiss patent publication No. 486,754 is known another module building set for the building up of rail areas, wherein one uses a series of different forms of rail insulators of plastic which can be assembled so that they surround the rail and are secured by a bolt extending from rail support to rail support. It is thus necessary to have a large number of rail insulators in order to be able to build up a rail area in which are used conductor rails of different dimensions.
As disclosed in U.S. Pat. No. 2,445,463, there are known rail insulators for mounting on rail supports which are substantially U-shaped, in that the rail insulator is formed to be secured on the rail support by means of one or more bolts which are secured in threaded holes in the insulator, and pass through holes in the rail support. One thus achieves a reasonably solid construction, but an installation which is troublesome to change, because a large number of bolts have to be completely screwed out during the dismantling and screwed in again in forming the new assembly.
As disclosed in U.S. Pat. No. 2,310,919, there are known rail insulators which are designed to be fastened to a rail support by screws, each of such insulators being provided with a notch which corresponds to the thickness of the rail being used. Also in this case the method of securing the rail insulator is unfortunate when it comes to changing the installation, the reason being that each insulator is fastened directly to the rail support by means of screws.
The object of the invention according to the present application is to provide a rail insulator for use in the building up of rail areas in which the insulators can be removed from and mounted on the rail support quickly and easily, and without diminishing the strength and the ability of the construction to absorb mechanical forces from changes in current.
In one embodiment, it is possible to mount rail insulators on the rail support wherever this may be desired. Moreover, if the spaces between the rail insulators are filled out with distance pieces, or if the insulators are arranged completely up against each other, a very rigid and mechanically stable construction is achieved in which the dynamic forces can be transferred through the adjacent insulators. Since the rail support has holes along the whole of its length, one can always distribute the conductor rails uniformly across the whole of the support, so that the mechanical effects from the electric current are the least possible.
According to a further aspect of the invention, the conductor rail can be bolted securely to the rail support or between two rail supports, all depending on the size of the conductor rail and the current which has to run through the rail. Thus it is possible to use the same rail support for all sizes and forms of rail areas. Similarly, the rail insulator can be
REFERENCES:
patent: 2310919 (1943-02-01), Adam
patent: 2445463 (1948-07-01), West
patent: 2966540 (1960-12-01), Christensen
patent: 3003021 (1961-10-01), Christensen
Logstrup Jorgen
Sparre Preben C.
A/S Logstrup-Steel
Askin Laramie E.
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