Tools – Wire stripper – Having relatively movable clamp and blade
Reexamination Certificate
1998-10-27
2001-04-24
Smith, James G. (Department: 3723)
Tools
Wire stripper
Having relatively movable clamp and blade
C081S009410
Reexamination Certificate
active
06220119
ABSTRACT:
The invention relates to stripping tongs for sheathed electrical cables, having two tong arms that pivot toward one another, counter to a restoring spring, about a common pivoting shaft, the arms having cable cross-cutters and cutting blades with associated clamping jaws for stripping cables.
Stripping tongs of this type are known, for example, from DE-GM 85 17 665, in which the cross-cutters are spaced beneath the pivoting shaft of the tong arms and the stripping blades and the clamping jaws are spaced above the pivoting shaft of the tong arms.
In these tongs, the cable is inserted in the longitudinal direction of the tong-arm pivoting shaft for the purpose of cross-cutting, and the cable is then inserted into the clamping jaws and cutting blades transversely to the longitudinal axis for stripping, so the tongs must be exchanged during operation, or the insertion direction of the cable must be changed, both of which are laborious processes.
The transfer path of the cable from cross-cutting to stripping is relatively large, and the operating personnel must either rotate the tongs in an awkward fashion or transfer the cable to the angular position in a disadvantageous manner, which is an impractical work method.
Furthermore, the cutting blades for stripping the cable are not protected against damage in the case of harder sheaths; rather, an excessive pressure is exerted, which causes damage and therefore has a negative impact on the service life of the cutting blades.
It is the object of the invention to provide stripping tongs constructed in the manner described at the outset, which are equipped with cross-cutting and stripping means that are in a favorable spatial arrangement and permit comfortable insertion of the cable on a short path, the tongs further allowing fast, reliable cross-cutting and stripping without stressing the blades.
In accordance with the invention, this object is accomplished by the characterizing features of claim
1
.
The dependent claims disclose design features that represent advantageous and beneficial modifications of the solution to the object.
The stripping tongs of the invention possess a spatially-advantageous arrangement of cross-cutting and stripping means that permit a short cable-insertion path, and assure fast, reliable cross-cutting and stripping of cables without stressing the blades.
The cable cross-cutters and the stripping blades and their associated clamping jaws are disposed closely together, and in the same cable feed-in or insertion plane in the stripping tongs, so while the stripping tongs are being held, the cable can be laid in the same direction in the tongs for both functions.
The sheathed cable is cross-cut from a roll by two knife-like cross-cutters that can be displaced toward one another, and the cables are stripped by clamping jaws that can be moved toward one another and two cutting blades that can be moved toward one another, which blades first cut into to the cable and then pull off the stripped sheath region by pivoting in the longitudinal direction of the cable.
The motion of the clamping jaws and the cutting blades is controlled by the second tong arm by way of a pressure roller and a curved piece that is disposed in the first tong arm and releases the clamping jaws and knife blades immediately following stripping, so the cable can be removed immediately from the tongs. This effects extremely fast and efficient cable stripping.
Moreover, the curved piece in the holder is disposed to pivot to a limited extent, and is spring-loaded. With stronger cable sheath material, greater pressure must be exerted on the two tong arms for stripping, because the blades cannot perform the stripping and clamp the cable inside themselves. Then the spring is activated in that, because the pressure roller is running in the control path of the curved piece, the roller is in an unfavorable position with respect to the curved path, causing excessive pressure, so that the prestressing of the compression spring, which is set for normal stripping, is exceeded, which makes the spring yield and allows the curved piece to recede into the holder; through angular pivoting, this curved piece can roll back via the pressure roller and pivot back, which immediately releases the cable that has not yet been stripped. This process is gentle on the cutting blades, and does not damage them. When the pressure exerted by the tong arms is excessive during stripping, and the tongs could become damaged by the harder sheath material, the spring thus releases the curved path immediately.
For moving the curved piece, and for the arrangement of the cross-cutters and cutting blades with clamping jaws, one tong arm includes levers that are actuated by the pressure roller of the second tong arm and perform the displacement and pivoting movements. The tong arm having the pressure roller need only be moved toward the tong arm embodied as the main arm, and the cross-cutting and stripping processes are performed automatically. The tong arm that receives the levers with the curved pieces and the cutting edges and clamping jaws is preferably box-shaped, and is closed with a removable lid up to the feed-in guides for the cable for cross-cutting and stripping. Because of its box shape, this tong arm can be made of plastic, and possesses a very high stability. Because of the arrangement of the cross-cutting and stripping means with respect to one another, and the control of these parts by the curved piece and the levers, the stripping tongs have a high service value, and enable efficient cross-cutting and stripping of sheathed cables while offering extremely comfortable handling.
In addition, the fact that the stripping tongs are largely produced from plastic makes them far more lightweight than conventional metal tongs and, again, improves handling. The use of plastic in the stripping tongs also allows them to be manufactured more simply and at lower cost.
REFERENCES:
patent: 3221576 (1965-12-01), Goetz
patent: 3311001 (1967-03-01), Gallagher
patent: 5713249 (1998-02-01), Liversidge
patent: 85176656 (1985-10-01), None
patent: 1142602 (1969-02-01), None
Browdy and Neimark
Smith James G.
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