Tools – Wire stripper – Bench tools
Reexamination Certificate
2000-08-30
2001-12-18
Smith, James G. (Department: 3723)
Tools
Wire stripper
Bench tools
C029S828000
Reexamination Certificate
active
06330839
ABSTRACT:
CROSS-REFERENCES TO RELATED APPLICATIONS
This application claims the priority of European Patent Application, Ser. No. 99 810 990.4, filed Nov. 1, 1999, the subject matter of which is incorporated herein by reference.
BACKGROUND OF THE INVENTION
The present invention relates to a method and apparatus for stripping and removing the shielding from a cable.
U.S. Pat. No. 3,153,358 describes a shielded wire stripper by which, after removal of the outer sheath, the exposed cable end with shielding is placed into respective bores of first and second casings and so retained that the metallic shielding is compressed, when the second casing moves relative thereto in axial direction of the cable, and pushed by the second casing, which is provided with a counterbore, against a circular shoulder of the first casing, thereby shearing off the shielding. The separation process is thus implemented substantially through a shearing action which acts in axial direction of the cable. This is disadvantageous because the cable end and in particular the sheath in the area of the cable will fray and the shielding will expand out, thereby adversely affecting the electric connection.
SUMMARY OF THE INVENTION
It is thus an object of the present invention to provide an improved method for stripping and removing shielding from a cable, obviating the afore-stated drawbacks.
In particular, it is an object of the present invention to provide an improved method for stripping and removing shielding from a cable, by which the cable end of an electric conductor, after trimming away the insulating sheath, can be stripped of the enveloping shielding in a simple and cost-efficient manner to realize a reliable connection, without altering a relative geometric disposition in particular of two, three or more electric conductors, whereby this requirement is also ensured in relatively thin cables.
These objects, and others which will become apparent hereinafter, are attained in accordance with the present invention by stripping away the insulating sheath from an end of the cable to expose a portion of shielding, which envelopes an inner electrical conductor; compressing the exposed shielding portion in axial direction of the cable to so deform the shielding portion as to assume a donut shape which exceeds an outer dimension of the insulating sheath; and severing a circular section of the bunched shielding portion by a cutting unit which is movable approximately transversely to a longitudinal orientation of the cable.
According to another feature of the present invention, the exposed shielding portion is held between two clamping devices which are spaced-apart in axial direction of the cable and movable relative to one another, with the compression being implemented by moving the clamping devices relative to one another to thereby push together and bunch up the shielding portion until the donut-shape is realized.
Suitably, the circular section of the bunched shielding portion is positioned above the insulating sheath and has a substantially triangular-shaped configuration, whereby the triangular-shaped circular section has walls extending at an acute angle.
According to another feature of the present invention, the cutting unit can be moved from an idle position, in which the cutting unit extends transversely to a longitudinal axis of the cable, to an operative position, in which the cutting unit orbits around the bunched shielding portion for shearing off the circular section. Suitably, the bunched shielding portion is sheared off directly at an outer periphery of the insulation by the cutting unit orbiting around the bunched shielding portion. Of course, it is also possible to turn the cable and the bunched shielding portion relative to the cutting unit in the operative position for shearing off the circular section.
It is still another object of the present invention to provide an improved apparatus for carrying out the novel and inventive method of stripping and removing shielding from a cable, in accordance with the present invention.
This object is attained in accordance with the present invention by providing a pair of clamping devices for insertion of a cable which has been stripped of its insulating sheath to thereby expose a portion of a shielding, with the clamping devices so positioned at a distance to one another as to confine the exposed shielding portion therebetween, wherein the clamping devices are movable relative to one another to compress and bunch up the shielding portion to assume a donut shape; and by providing a cutting device movable in a direction transversely to a longitudinal direction of the cable for shearing off the bunched shielding portion.
REFERENCES:
patent: 2929285 (1960-03-01), Gulemi
patent: 2988940 (1961-06-01), Folkenroth et al.
patent: 3044333 (1962-07-01), Broske
patent: 3044334 (1962-07-01), Broske
patent: 3139778 (1964-07-01), Bielinski et al.
patent: 3153358 (1964-10-01), Havens
patent: 3171306 (1965-03-01), Mirsch
patent: 4019409 (1977-04-01), McKeever
patent: 4719697 (1988-01-01), Schwartzman et al.
patent: 4763410 (1988-08-01), Schwartzman
patent: 4914986 (1990-04-01), Masaki
patent: 5072632 (1991-12-01), Sayyadi
patent: 5074169 (1991-12-01), Matz
patent: 5138910 (1992-08-01), Ishikawa et al.
patent: 5867896 (1999-02-01), Watanabe
patent: 43 27 356 A1 (1995-02-01), None
cawitec AG
Feiereisen Henry M.
Shakeri Hadi
Smith James G.
LandOfFree
Method and apparatus for stripping and removing the... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and apparatus for stripping and removing the..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for stripping and removing the... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2565019