Electrical connectors – Metallic connector or contact having movable or resilient... – Screw-thread operated securing part
Reexamination Certificate
1999-04-29
2003-05-20
Nasri, Javaid (Department: 2839)
Electrical connectors
Metallic connector or contact having movable or resilient...
Screw-thread operated securing part
C439S756000
Reexamination Certificate
active
06565393
ABSTRACT:
BACKGROUND AND SUMMARY OF THE INVENTION
The present invention relates to a body for use with compressor motor terminals, and more particularly, to an arrangement which uses wedging for effectively and securely retrofitting an electrical lead or lead spade termination on a deteriorated compressor terminal.
A conventional hermetically sealed electric motor
10
used for air conditioning compressors and the like typically has three identical terminals
11
,
12
,
13
arranged in a triangular pattern as seen in
FIG. 1
a
and substantially encapsulated in an electrically insulating plug. These types of terminals protrude about ⅜″ from the insulating plug and typically consist of a ¼″×{fraction (1/32)}″ spade welded or brazed to a ⅛″ diameter cylindrical pin that passes through the insulating plug. The specific configuration of a known individual terminal, e.g. terminal
11
, is shown in
FIG. 1
b
and includes the terminal
14
and the welded-on spade
15
.
Electrical power is typically supplied to the compressor motor
10
by lead wires with female connections attached to the end that fit over the above-described male-type spade terminals
11
,
12
,
13
. This connection often has poor mechanical contact (thus also poor electrical contact) and causes the terminal to deteriorate through arcing and the like. Part or all of the spade-type connector or terminal
15
(
FIG. 1
b
) may be deteriorated to a point where the original female connector can no longer serve its intended purpose. A new adapter is needed that can easily replace the old connection and can be attached to a partially deteriorated terminal without removing the deteriorated terminal because removal of the terminal can damage the hermetic seal due to the fragility of the insulator plug.
Conventional approaches for allowing an electrical lead to be connected to a deteriorated terminal have a number of disadvantages. For example, they do not work well in confined spaces or else require the use of special tooling.
U.S. Pat. Nos. 5,662,502 and 5,857,878, for example, describe an adapter designed to enable an electrical connection to each of the male connectors on a compressor assembly. In particular, a set screw is provided at the bottom of a tube so as to engage a damaged rod or cylindrical pin of the terminal. One problem with this approach is that the set screw connection can be loosened due to vibrations and the like and/or the thread can become stripped because the walls of the tube must be made thin due to terminal spacing restraints and can contain only a few threads. That is, a high drive torque is created by the set screw connection which causes failure of the few threads which are too few and too fine to withstand the torque. Also, we have found that it is unnecessary to provide an adaptor for each connector as typically the only two terminals associated with the run windings become sufficiently deteriorated due to arcing. This is particularly important because off the limited space or “real estate” available on the terminal area.
An object of the present invention is to provide an arrangement which is simple in construction and permits a secure connection to deteriorated connectors on a compressor terminal, and minimizes the number of retrofit connections needed.
Another object of the present invention is to provide a connector which can be used in confined spaces (where adjacent connectors will touch without shorting) and with standard tooling.
A yet further object of the present invention is to provide an arrangement which allows manipulation to attach the lead by access to the front face of the connector rather than the side which has more obstructions present so as to limit convenient accessibility.
Another object of the present invention is to provide an arrangement with a direct electrical connection of the compressor terminal and the lead wire and, without the need for an electrically conductive connector body.
Still another object of the present invention is to provide a connector which achieves improved electrical contact with the terminal and thereby reduces electrical resistance.
Yet a further object of the present invention is to employ an adapter which can be constructed from readily available, inexpensive non-conductive materials.
A still additional object of the present invention is to allow a connector to be securely connected with the terminal without the need to remove any portion of the deteriorated terminal.
This object has been achieved in accordance with the present invention by providing a non-conductive, non-metallic connector body which utilizes a wedging force or action to securely fasten an electrical lead or lead spade termination to a deteriorated compressor run-winding terminal without the need to crimp the lead or deform the connector body in any manner.
REFERENCES:
patent: 1537968 (1925-05-01), Schnabel
patent: 2429448 (1947-10-01), Bakke
patent: 3345452 (1967-10-01), Logan et al.
patent: 3447122 (1969-05-01), Beck
patent: 3707698 (1972-12-01), Robinson et al.
patent: 4223179 (1980-09-01), Lusk et al.
patent: 4521067 (1985-06-01), Dufresne
patent: 5062812 (1991-11-01), Allen
patent: 5302143 (1994-04-01), Inoue et al.
patent: 5803371 (1998-09-01), Sugiyama et al.
patent: 5957733 (1999-09-01), Mello et al.
Crowell & Moring LLP
Mainstream Engineering Corporation
Nasri Javaid
LandOfFree
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