Tools – Wire stripper – Having relatively movable clamp and blade
Patent
1994-07-18
1995-11-28
Smith, James G.
Tools
Wire stripper
Having relatively movable clamp and blade
81 94, 30 901, H02G 112
Patent
active
054697620
DESCRIPTION:
BRIEF SUMMARY
The invention concerns a device for the purpose of stripping insulation from electrical conductors and/or wires, that consists of at least two legs forming a stripping device, such that which the legs can be closed, and tool part.
A device for the stripping of electrical conductors and/or wires is known from DD 248 003 A1. In that device, two legs are arranged opposing each other, that have cutting tool parts at their forward ends and are made closable by a swivelling axis pin at their rear end. Connected to the swivelling axis pin is a third leg, that is in turn connected with the forward leg and with the cutting tool parts by an angle arm.
When the third leg is activated, the cutting tool parts are pressed together so as to cut through the insulation. When they are pressed together for a second time, the cutting tool parts are pulled backwards by the angle arm. Clamps arranged in front of the cutting tool parts hold the conductor in fixed position. This double action of cutting and removing the insulation can damage the conductor if the pressure applied varies while the insulation is being pulled away. Indeed, the cutting tool parts, which are arranged as sheering blades, can damage larger-diameter conductors so severely that the conductor may break during the subsequent processing, or may be cut completely through during the stripping procedure. There is a further disadvantage in that the user's finger can be caught in the action of the three contiguous legs and the intermediate angle arm.
A device for the stripping of electrical conductors and/or wires is known from DE 36 32 685 C2. It consists of two pairs of legs that move about a swivelling axis pin. The shorter pair of legs is designed as a wire cutter. Conductors and wires can be cut into specified lengths with the help of the longer pair of legs of these pliers, which then perform the function of hand-grips. The longer legs can be used furthermore as a stripping device. In this case a locking device prevents the two operating legs from swinging open accidentally.
Although conductors and wires can be stripped by applying the cutting tool parts on the inner sides of the operating legs, this procedure is essentially limited to the cutting of insulation on conductors or wires that are round in shape. During the subsequent removal of the insulation, the wire cutter located on the opposite side is partially retracted. Should the pair of legs open unintentionally, there is the danger of injury from the cutting tool parts thus exposed.
The invention has as its purpose the further development of the device named at the outset for stripping electrical conductors and wires, so as to enable the easy and safe stripping of conductors and wires of varying cross section.
This purpose is achieved in accordance with the invention, by doubling the swivelling axis pin so that the two opposing legs with their cutting tool parts are arranged as forceps and, by means of the guiding elements arranged on them, can be slid in contrary motion against each other after being pressed together.
The advantages realized with the invention consist in particular in that the legs are arranged against each other as forceps, and thus allow the conductor or wire to be gripped securely and safely.
In the following explanation, insulation, made of copper, aluminum or similar material, material e.g. plastic, rubber, specialized paper or similar material.
Since cables and wires have substantially the same construction, the stripping device described is also applicable for cables.
After the wire is gripped, the surrounding sheathing can be cut through and pulled off. The insulation on the individual conductors thus exposed can now also be safely cut through. The doubling of the swivelling axis pin transforms the gripping motion into a sheering motion so that with one pressing together of the two legs, the insulation on the conductor is cut through and subsequently removed.
In a further embodiment of the invention, and going beyond the double mounting of the swivelling axis pin, in addition
REFERENCES:
patent: 3125908 (1964-03-01), Rozmus
patent: 4341134 (1982-07-01), Yamazaki et al.
patent: 4377954 (1983-03-01), Schulze
patent: 4557164 (1985-12-01), Krampe
patent: 5131299 (1992-07-01), Krampe
Milde Jr. Karl F.
Smith James G.
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