Electrical connectors – Contact comprising cutter – Insulation cutter
Patent
1994-04-28
1995-09-26
Bilinsky, Z. R.
Electrical connectors
Contact comprising cutter
Insulation cutter
H01R 424
Patent
active
054530245
DESCRIPTION:
BRIEF SUMMARY
The invention relates to two-pin electric plugs, to be used with a flexible two-wire cable.
The aim of this invention is to dispense with the need of any tools, such as knives, screwdrivers or pliers, necessary to fasten the cable to the plug, as well as to facilitate this operation to a greater extent than in the prior related inventions.
Prior inventions have not succeeded in dispensing with the need of any tool for the wiring.
It is the case of the Switz Patent 383 458, and the U.S. Pat. Nos. 2,658,184 and 4,842,542, called D1, D2 and D3, respectively, hereafter.
In D1, a built-in screw, has to be screwed in, either with screwdriver, or with a coin used as one.
In D1, D2 and D3, the device calls for the use of plier to even out the ends of the electric cable, if needs be.
In D2 and D3, there is no splitting device for the cable wires, therefore a cutting tool is required, as current two-wire cables are coated with an outer sheath.
In D1 the separation process of the two cable wires, which uses a cone-shaped screw, calls for strength when both wires are coated by the outer sheath. This cone-shaped screw system does not allow either the wires to follow a sinuous enough path, that would lock them into place in the event of strain applied on the plug (see D1, FIGS. 2 and 5). Furthermore, the curved path resulting from the separation of the wires is the actual connection spot. Therefore, any strain applied on the cable, is also directly applied on the connection devices and there is a real possibility of damaging them. This becomes even more apparent if we consider that most wires--those used in our invention too--exhibit sharp and fragile metallic prongs at their ends. In D2, the ridge system (33) used to lock the cable (FIGS. 1,4,5) does not seem to be very efficient.
The present invention solves these problems.
In the three embodiments of the invention discussed here, the cutting and the wiring of the electric cable are performed simultaneously with the shutting of the plug.
Furthermore, in the second embodiment of the invention, the cable is set into position automatically. Finally, in the third and fullest embodiment, the shutting of the plug causes the wiring and, at the same time, twists and turns in the path of the cable, such that, even a strong stress applied on the cable, has no effect on the part of the wires used in the connection. Also, no strain is brought on the plug contact parts.
The three embodiments of the invention share the following:
At least three contact spikes are used, with a 5 mm spacing lengthwise, and laterally so that the inner conducting part of each wire may be reached to at least a third of its depth on both sides, and to the center of its section in the middle. The spikes should be oriented toward the conducting heart of the wire, according to the direction it follows as it gets cut, and should be long enough to cut through the conducting part of the said wire. The said contact spikes are at least three tenths of a millimeter thick, or for example, a third of the diameter of the conducting portion of the cord; these spikes being a built-in feature of the female or male pins of the plug. The points and edges of these elements are sharp or should be sharpened.
Their use dispenses with the need of stripping the insulating sheath from the ends of the cord and screwing in the unsheathed wires.
A T-shaped blade is incorporated to the plug, and securely hooked in the plastic block, in which is is partially embedded. The dimensions of this blade are such that, in the fullest embodiment of the invention, the cable is fully cut to its end situated in the plug, prior to its wires being led through their recesses.
This feature dispenses with the need a knife to unsheathe the electrical cord, and split the two wires.
The cutting device, built into the plug, calls for the presence of a blade rotating around an axis, this axis being either parallel, or, on the contrary, perpendicular, to the longitudinal axis of the cable.
In the first embodiment of this invention, the rotation axis is pa
REFERENCES:
patent: 2658184 (1953-11-01), Greenbaum
patent: 2717365 (1955-09-01), Greenbaum
patent: 3596232 (1971-07-01), Medley
patent: 3745228 (1973-07-01), Vogt
patent: 4129350 (1978-12-01), Winn
patent: 4842546 (1989-06-01), Song
LandOfFree
Two-pin electric plug, to be wired without unsheathing the lead does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Two-pin electric plug, to be wired without unsheathing the lead, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Two-pin electric plug, to be wired without unsheathing the lead will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1549521