Insert for fixing an electrical connector to a thin wall

Details Insert for fixing an electrical connector to a thin wall Insert for fixing an electrical connector to a thin wall

1998-05-26

2001-07-10

Paumen, Gary F. (Department: 2833)

Electrical connectors

Metallic connector or contact having movable or resilient...

Screw-thread operated securing part

C439S741000

Reexamination Certificate

active

06257939

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an insert for fixing of an electric connector terminal to a thin wall, and to the methods for mounting and dismounting same.
2. Description of Background and Material Information
It is especially known from the co-owned European Patent No. 0 575 259 to fix a terminal, for example, into the core of a rail of a railway, by means of an insert which is generally constituted of a metallic pin, provided with a truncated head and a threaded extension, and of a non-split metallic ring which is provided with at least a retaining shoulder, the pin head being adapted to be threaded into the ring, on the side opposite its retaining shoulder, whereas the assembly is provided to be introduced into a bore made in the wall, while the terminal is integral with the ring or fixed between the ring and a nut screwed onto the threaded extension of the pin.
This prior art relates to fixing a terminal on a relatively thick wall, and the binding is obtained by expansion of the ring which specifically has, to this end, a substantially truncated bore, whereas the shoulder is a flange that is additionally provided with an annular groove.
For an electric connector, the advantages of a non-split ring were disclosed in the aforementioned patent (better contact, sealing . . . ).
It is readily understandable that such an insert is not particularly well adapted to a thin wall, as the thickness thereof would not allow sufficient expanding of the ring.
SUMMARY OF THE INVENTION
Therefore, an object of the invention is to provide a new insert which retains the advantages of the aforementioned insert but adapts better to thin walls.
To this end, the insert is generally of the aforementioned type but it is remarkable and differs from this known art in that the internal bore of the ring is initially cylindrical, and that the longitudinal dimension thereof, from its free end to its retaining shoulder, is distinctly greater than the thickness of the wall, so that the part extending past the wall, on the side of the truncated pin head, deforms itself by flaring out during the penetration of the pin head into the ring.
According to an interesting but non-limiting embodiment, the ring has a stepped double shoulder, the first is used as a retaining shoulder of the ring on the wall, and the second, called an extracting shoulder, allows ensuring a grip by an extracting tool on the ring.
The retaining shoulder of the ring can also be provided with an annular groove provided in the area of its connection with the external surface of the ring.
The pin is, for example, made of stainless steel and the ring of tinned copper while the pin and the ring are advantageously assembled together before use.
The invention also proposes, on the one hand, a method for mounting such an insert into a wall, which is remarkable in that it provide for making a bore in the wall and marking the internal peripheral surface of the bore by forming serrations, of introducing the insert into the bore until the retaining shoulder of the ring comes into contact with the wall, then of exerting a traction on the rod of the pin to cause a diametrical expansion of the ring during penetration of the pin, and on the other hand, a method for dismounting, which is remarkable in that it provides, after having unscrewed the nut and laid the terminal when needed, of removing the pin from the ring by striking on the end opposite its truncated head, of drilling the ring to increase its internal diameter so as to reduce the thickness and thus its resistance, then of removing the ring.
For dismounting an insert provided with a double shoulder as previously specified, the ring can also be extracted by utilizing a tool which takes support on the wall while gripping the extracting shoulder.


REFERENCES:
patent: 2248845 (1941-07-01), Beam
patent: 4552424 (1985-11-01), Seaquiist et al.
patent: 0575259 (1993-12-01), None
patent: 0677419 (1995-10-01), None

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