Tools – Wire stripper – Bench tools
Reexamination Certificate
1999-10-12
2001-11-27
Hail, III, Joseph J. (Department: 3723)
Tools
Wire stripper
Bench tools
C081S009420
Reexamination Certificate
active
06321621
ABSTRACT:
The invention relates to a device according to the preamble of claim
1
, having an arrangement of electromechanical parts for removing one or more protective layers from a single-conductor or multiconductor optical waveguide. A device corresponding to the preamble was brought onto the market by the Applicant under the name FO 45 or by the name Handcoax.
Further devices have been disclosed for stripping exclusively optical waveguides, for example under the name HJS-01 by a Japanese company. However, in contrast to the stated devices of the Applicant, this device has no electric drive controlling the stripping.
An externally similar device is described in DE-A-4203995. In this design, a special material for stripping knives is protected. The force with which the stripping knives are pressed against the optical waveguide, maintenance of the heating time and in particular the stripping speed are left to the operator. This gives rise to considerable differences in the quality and time losses through the operation.
A particular problem is the impossibility of maintaining optimum stripping procedures. Thus, in manual stripping, relatively great resistance to stripping is detectable as a rule after incision into the material and at the beginning of the stripping, which resistance causes the operator to apply a relatively large stripping force. After the beginning of the stripping movement, however, the resistance to stripping decreases rapidly so that the high force applied by the operator leads to a sudden, abrupt stripping movement.
This can cause axial overloading of the optical fibers and of the conductor.
In the device according to DE-A or in the process used therewith and comprising of “soft” stripping knives, as well as another process, it is usual to heat the sheath. However, to enable the soft knives to make a good incision, heating must also be effected in the region of the knives in this known device. However, this may be disadvantageous because a soft sheath offers less supportive resistance for centering functions. A slightly harder sheath in the region of the interface is desirable since, according to the invention, it provides a covering for the remaining heated protective layer. Consequently, the invention should also permit in particular the use of hard, metallic stripping knives, so that the interface itself need not be heated.
CH-A-683645 describes a semiautomatic device for stripping optical waveguides. However, this device has a plurality of individual drives separate for each function, which is disadvantageous with regard to the size and required control volume. A version of this device in the form of a hand device is therefore possible only with difficulty.
The object of the invention is thus furthermore to achieve a device which has a small volume and low production costs and at least a semiautomatically controlled function sequence, in order to achieve good stripping quality and uniform sheath or layer removal therewith, as in the case of conventional larger, fully automatic devices.
The size and the required control volume should be so small that a device according to the invention should be capable of being held in the hand, in a manner comparable with the existing non-motor-driven devices.
The prior art includes further documents which describe devices which do not perform these functions: DE-A-3736581; DE-A-4007762; DE-A-4038414; DE-A-3529141; JP-A-1-147503; JP-A-4-257802; JP-A-3-61908; JP-A-62-25703 and U.S. Pat. No. 5033335.
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Patent Apstracts of Japan. 04257802 dated Sep. 14, 1992. “Hot jacket Stripper HJS-01 Instruction Manual”. Fujikura PS-02 Primary Caot Stripper cover page. JP-A-1/147503 Drawing. Northern Telecom—NT7L30GA Automated Stripper Cleaver Pamphlet. 2 Pages.
Ideal Rotary Wire Strippers Pamphlet. 4 Pages.
Hail III Joseph J.
Schleuniger Holding AG
Thomas David B.
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