Tools – Wire stripper – Having relatively movable clamp and blade
Patent
1995-09-01
1998-02-03
Meislin, D. S.
Tools
Wire stripper
Having relatively movable clamp and blade
81 941, H02G 112
Patent
active
057132496
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a wire stripper--that is to say, a tool for separating and at least partially removing an end portion of an outer layer of an elongate filamentary member having an inner core surrounded by said outer layer.
In the following, the invention will exclusively be defined and described with reference to the stripping of an electrical wire, having an inner core conductor and an outer insulating layer. It will however be understood that the invention may be used to remove an end portion of an outer layer surrounding a different kind of core member--for example, an outer sheath surrounding a fibre optic cable. As such, the terms "wire" and "insulation" as used herein should be interpreted broadly.
There have been numerous designs of hand-held and operated wire strippers, all of which aim at providing a tool which is easy to use, requires a relatively small operating force, and which can be manufactured relatively cheaply from few parts, without greatly compromising functionality. A further aim of many of these tools is to provide automatic adjustment so that no separate manual adjustment need be made to suit different wire diameters and insulation thicknesses.
One commercially successful wire stripper is described in EP-A-0,007,699. This tool has a pair of handles between which is mounted a complex cam mechanism arranged to close both a pair of wire clamping jaws and a pair of insulation stripping jaws, a link being arranged between one of the handles and the cam mechanism and which link together with the cam mechanism pass through a transition point between first and second stages of a stripping cycle. A disadvantage of this mechanism is that the velocity ratio between the handles and the stripping jaws is at its greatest when the stripping action is commenced, and at its smallest towards the end of the stripping cycle when the force required to displace the insulation is at its smallest. The consequence is that relatively high forces have to be applied to the handles in the initial stage of the stripping action, and that the length of insulation which may wholly be removed from the wire (as distinct from just displaced along the wire) is reduced. Those problems have already been considered for example in GB-B-2,077,517, which describes sophisticated cam mechanisms to optimise force transmission ratios for both the cutting and stripping stages.
In EP-A-0,309,871, there is described another similar kind of stripping tool. In this design, the stripping jaws are always connected to a control lever by a pivoted link, which link itself is constrained to move with a gripping jaw during a first stage of operation, and then to move away from the jaw during a stripping stage, to pull the stripping jaws through the link. The mechanism is complex and it is difficult to control the gripping force to be adequate for a wide range of wire sizes.
It is a principal aim of the present invention to address the above problems and so provide an improved design of wire stripper which requires relatively low operating forces and which has an improved stripping action.
According to the present invention, there is provided a wire stripper comprising: a wire there-between; relative sliding movement along the length of a clamped wire, clamping movement of the clamping jaws closing the stripping jaws; and operating stroke having a first stage during which the wire-clamping jaws close to clamp a wire and the stripping jaws close to cut into insulation on the wire, and having a second stage during which the clamping jaws continue to clamp the wire and the stripping jaws perform sliding movement to effect stripping of the clamped wire; and the drive means, and the drive means is arranged to constrain the pivotal connection of the actuator to move along a locus having a directional component in the direction of sliding stripping movement of the stripping jaws the actuator being free of the stripping jaws so that the stripping jaws effect no sliding movement during said first stage of an operating stroke of the drive mea
REFERENCES:
patent: 3915037 (1975-10-01), Wiener
patent: 4407174 (1983-10-01), Schulze
patent: 4485696 (1984-12-01), Bieganski
Danganan Joni B.
Meislin D. S.
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