Cutlery – Means for cutting elongate – strand-encircling sheath – Longitudinally
Patent
1998-03-13
2000-06-13
Peterson, Kenneth E.
Cutlery
Means for cutting elongate, strand-encircling sheath
Longitudinally
30 901, 30 904, 30 906, H02G 112
Patent
active
060733497
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a wire stripper--that is to say, a tool intended normally to remove insulation from an insulated electrical wire or cable. The term "wire stripper" as used herein is not to be regarded as limited to this normal use; the wire stripper of this invention may be used to assist in the removal of any outer sheath from an elongate filamentary member.
In this Specification, the term "wire" will be used broadly to refer to all kinds of filamentary member (such as an electrical conductor) having an outer sheath (in the case of an electrical conductor, a sheath of electrical insulation).
A known kind of wire stripper has a body from which projects a cutting blade, the body supporting a wire clamp in the form of a hook-like member adapted to receive the insulated wire to be stripped and urge that wire into engagement with the projecting cutting blade. Once an end portion of the wire has properly been located within the clamp and the blade has penetrated the insulation, the tool may be rotated around the wire to effect an annular cut in the insulation. The end portion of the insulation may then be removed from the wire so exposing the conductors.
A wire stripper as described above particularly lends itself to the stripping of relatively large diameter wires and to the stripping of heavy duty or tough insulation sheaths. In order to facilitate such stripping, it is also known to arrange for the blade to be rotatable to a second position at 90.degree. to the normal blade position where an annular cut may be performed. This allows a linear cut to be made to the end of the wire from the annular cut following the completion of the latter.
In GB-A-1196140 there is described a tool of the above kind, where the blade is cranked and is rotatably mounted in a holder so that the blade may perform a storing action. The blade will thus take up an appropriate position dependent upon whether the user rotates the tool around the wire, or pulls the tool towards the end of the wire.
In GB-2108773-A there is described another such a tool but here a lever is provided to allow the user to move the blade between its two positions respectively for annular and linear cuts, the blade being spring-urged to the annular cut position. With some difficulty, the user may also hold the lever at an intermediate position so that on rotating the tool about a wire, the tool makes a helical cut along the insulation.
The above-described tools, though widely employed for stripping insulation from large diameter wires or wires having heavy duty or tough insulation, require considerable user dexterity, especially when a helical cut is to be made. For example, it is difficult to hold the lever of the tool of GB-2108773-A at an appropriate and constant position whilst simultaneously rotating the tool about the wire, in order to perform a helical cut.
The present invention aims at addressing the disadvantages of the known forms of wire stripper of the kind described above, in order to provide a tool which is relatively easy to use and yet which is effective at producing annular, linear and helical cuts to facilitate the removal of insulation from the wire.
According to one aspect of the present invention, there is provided a wire stripper comprising a blade carrier supporting a projecting cutting blade, a selector rotatably mounted on the blade carrier, a wire clamp slidably mounted on the selector and arranged to hold a wire to be stripped and to urge that wire against the cutting blade, co-operating abutment means on the blade carrier and the selector positively to define first, second and third cutting positions, in the first cutting position the blade being set to rotate around a held wire, in the second cutting position the carrier and blade being turned through substantially 90.degree. from the first cutting position whereby the blade is set to perform an axial cut, and in the third cutting position the carrier and blade being turned through an acute angle from the first cutting position whereby the blade is set to perform a helic
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Peterson Kenneth E.
Pryor Sean
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