Tools – Wire stripper – Having relatively movable clamp and blade
Patent
1990-10-26
1992-07-21
Parker, Roscoe V.
Tools
Wire stripper
Having relatively movable clamp and blade
H02G 112
Patent
active
051312999
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to an insulation stripping tool.
A stripping tool according to the preamble is known from the German Patent No. 32 41 530. In this known stripping tool, an arm is guided and supported in a recess in the center portion of another arm. A cylindrical pin, which is loosely supported in oblong holes of the arms, serves as a common pivoting point for the pivoting and shifting of both arms. The pin and a multi-step expanding spring are used to move the arms against one another such that their gripping jaws are pressed against each other and the associated blades are brought into the cutting position. Subsequently, the blade of the movable arm, together with the arm itself, is pulled back with respect to the other arm in order to strip off the insulation.
This known stripping tool according to the German Patent No. 32 41 530 has been manufactured in numerous variants and has generally proven well. However, the arms of the tool, when pressed against each other, do not only execute a pivoting movement but also a translational movement. This impairs the execution of fine or minute operations with this tool since it moves in a manner unusual to the hand of the user. Moreover, it is difficult to accommodate a wire cutter within this structure in such a way that it is easily accessible.
SUMMARY OF THE INVENTION
The principal object of the invention is to redesign a stripping tool such that it permits the execution of minute operations and accommodates a wire cutter between the jaws in such a manner as to be easily accessible.
This object, as well as other objects which will become apparent from the discussion that follows, are accomplished with a stripping tool of the type described above having the following characteristics:
In contrast to the stripping tool according to prior art, the present invention makes use of a pulling lever which draws along a stripping blade carrier that can be moved with respect to the upper jaw, thus bringing this carrier into a stripping position.
As indicated, for example, in the published German Patent Application No. 24 02 187, it is known to make use of such a "driving pin" for both stripping blade carriers. However, this arrangement involves a relatively complicated interaction between numerous individual parts.
Further, another known stripping tool disclosed in the published German Patent Application No. 33 08 053 makes use of several springs and has a transmission lever the one end of which leads to an extension of the second clamping jaw. However, the transmission lever is not linked to an expanding spring but is connected to tension springs. This mechanism is therefore relatively complicated.
In the stripping tool according to the invention, the pulling lever is configured such that it interacts with the one arm of the expanding spring. By means of a corresponding enlargement of the contact surface for the expanding spring outside a connecting line "L" between the first and the second pivoting point, the pulling lever, together with its joint holding the stripping blade carrier, can provide a torque in the direction of the gripping jaws.
In the following description, the terms "upper", "lower", "front", and "end" are used. This terminology refers to the embodiment represented in the accompanying drawings as far as "upper" and "lower" are concerned. The jaws are disposed in the "front" whereas the handles can be found at the "end". As will be understood by a person skilled in the art, interacting parts can, mutatis mutandis, be also associated with respective other parts; for example, the blades with the corresponding blade carriers. In order to facilitate the understanding of the terminology used in the text, kinematic reversals are not always included in the general wording.
The preferred embodiments of the present invention will now be described with reference to the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a side elevational view, partly in cross section, of a stripping tool according to a preferr
REFERENCES:
patent: 4341134 (1982-07-01), Yamazaki et al.
patent: 4557164 (1985-12-01), Krampe
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