JPS6360603B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a manual instrument for stripping the outer skin layer of electrical conductors and cables, consisting of a guiding device with an adjustable stripping blade that can be adapted to the diameter of each electrical conductor and cable. Regarding.

To prevent corona discharges in high-voltage cable insulation made of thermoplastic materials, a conductive layer is often applied as an outer skin. This conductive layer must be completely removed at the connection point or end of the cable. In this case, a surface that is as uniformly smooth as possible must be obtained.

Known manually operated peelers generally operate in the axial direction. Instruments for peeling the conductive layer in a spiral around the skin are also known. The surface quality obtained with these instruments and their operation are still unsatisfactory and require improvement.

The present invention improves such known manual instruments by removing the graphite-containing thermoplastic layer on the jacket surface of the high-voltage cable to a certain extent, so that the necessary surface area is reduced as much as possible in order to enable a cavity-free joining of the sleeve. The aim is to be flat and in particular free from axially extending grooves.

According to the invention, this purpose is achieved in that the guide device consists of three guide jaws mounted on a support disc and adjustable towards the center, one of these guide jaws having a peeling blade in the radius The guide jaws are arranged so as to be adjustable steplessly in the direction, and the guide jaws have a recessed running surface which has a predetermined pitch in the form of an obtuse thread, and the guide jaws also have a helical groove. can be adjusted to the respective conductor diameter by means of an adjustment disk provided with a drive rod, which is achieved in that the support disk is provided with a drive rod. Preferably, the peeling blade is arranged on a radially movable peeling blade support by means of a knurling screw, which support is adjusted by means of a tightening lever. The adjusting disc can be fixed by means of a second clamping lever.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a cross-sectional view of a high voltage cable. 31
32 is a conductive layer; 33 is a portion from which the conductive layer is removed; 34 is an insulating portion; 35 is a conductor;
is a silicone rubber sleeve coated over these.

FIGS. 2 and 3 show front and rear perspective views of a hand-held instrument according to the invention. This manual instrument is particularly compact and lightweight.
Above the support disk 11 there are three guide jaws 12,1 which can be adjusted to close towards the center.
3 and 14 are attached. Guide Jiyo 12,
13 and 14 are very short in the axial direction, for example about 20
mm. Guide wheels are running surfaces 16, 17, 18
is recessed in an arched manner so that it is guided as best as possible against the conductor envelope. Guide jaws 12, 13, 14 relative to the outer skin diameter of the conductor
The adjustment takes place by means of an adjusting disk 24 which is rotatable relative to the support disk 11 of the jaw, and which has three helical grooves 21, 22, 23. In this example, a support 123 for supporting the peeling blade 15 is directly attached to the guide jaw 14.

This structure allows the manual instrument of the invention to conductive layer 3 due to the relatively small axial length possible.
Edge 20 of the wire mesh sheathing 31 on top of 2 (Figure 1)
It is possible to peel down to mm, which allows the overall length of the connection to be shortened. Guide Jiyo 12,1
For example, obtuse threads 19, 120, 12 of a trapezoidal thread are attached to the recessed running surfaces 16, 17, 18 of 3, 14.
One predetermined pitch is machined for feeding. This thread is constructed in such a way that a reliable axial feed is ensured without damaging the surface of the conductive layer 32 (FIG. 1) and reducing its functionality. The feed stroke per revolution is matched to the desired chip width. That is, the entire cutting energy is utilized for each rotation. Running surface 16,1
Since 7, 18 are provided with a feeding function, the structural length of the instrument can be shortened. Due to the forced feed movement, no axial force consumption is required during operation. In other words, the instrument is easier to operate. When the guide jaws 12, 13, 14 come together in the diametrical direction of the conductor, the peeling blade 15 is simultaneously brought into its operating position. The peeling blade 15 itself can be adjusted steplessly in the radial direction in the jaw 14. Peeling blade 15
can be adjusted by radial movement of its support 123. The peeling blade support 123 is fixed by the tightening lever 125. The cutting depth is adjusted once by means of a knurled screw 124 and is tightly tightened by means of a tightening lever 125. The optimal structure of the blade of the peeling blade 15 was determined to have a cutting angle of 30 to 45 degrees. The blade is sharpened diagonally towards the cutting edge so that an angle of approximately 15° is created at the transition from the conductive layer surface 32 (FIG. 1) to the stripped surface 33 (FIG. 1). . This gentle angle is necessary for a cavity-free fit of the covering sleeve 36 (FIG. 1). Further, the peeling blade 15 is arranged so that the cutting edge of 1 to 2 mm in the diameter range of 15 to 45 mm intersects in advance of the contact point in the tangential direction of the circumference. This causes the peeling blade to be lightly pressed down and to support itself against the newly created surface. With this setting of the cutting data, a particularly uniformly smooth surface is obtained. The cutting blade in this case can be so small that the instrument can be rotated with the fingers. Rotation of the instrument is effected by drive rod 122. Pin 126 is used to adjust adjustment disc 24.

A particularly dangerous area with regard to the electrical strength of the high-voltage cable is the transition area 37 (FIG. 1) from the skinned surface 33 to the conductive layer surface 32. In this region, the conductive layer envelope should be as free as possible and should have a gently sloped transition of about 15 DEG over an axial length of about 2 to 3 mm.

The above-mentioned conditions cannot be achieved with known devices. In none of the known instruments the blade geometry is set optimally.
The cutting angle is too small and the cutting edge acts too hard.
This results in a fuzzy surface. Furthermore, the position of the blade is virtually impossible to reproduce. This is because it is necessary to newly set the blade each time to match the diameter of another work piece.

To machine a workpiece, the manual instrument according to the invention, like a screw tapper, is installed at one end of the workpiece in the working direction with an adjusting disk 24 and rotated clockwise by a drive rod 122. The adjusting disc 24 is fixed by a tightening lever 25.

In order to obtain an unblocked edge in the transition area from the conductive layer to the skinned surface, the instrument is directed towards a fixed stop. In this case, the feed is carried out in a sliding manner and the cutting layer is fed out.

For large cable diameters, it is particularly expedient to elastically support at least one of the guide jaws in order to compensate for deviations of the cable circumference from a circular shape and to improve the stripping process. 4 and 5 show one embodiment for this purpose. The guide jaw 132 is placed in a longitudinally extending groove of the holding rod 131, which is also placed in a radially extending groove of the support disk 11 and tightened in this radial groove. It can be fixed by operating the attached lever 25. This is exactly the same as, for example, in the case of the guide jaw 13 in FIGS. 2 and 3. The axial forces appearing during the peeling process are caused by the support disc 11 containing the guide jaws.
If the radial grooves extend all the way to the groove bottom, then a swallowtail or T-shape, for example, is therefore well and uniformly received. A corresponding embodiment is a retaining rod having a radially grooved portion as shown in FIG. The holding rod 131 has a longitudinally extending groove in which the guide jaw 132 can move radially. tension bolt 1
33 is pinned to the guide jaw 132,
This guide jaw can be moved against the force of the compression spring 134. This compression spring is supported at its end on a retaining rod 131 and at the bottom of a hole in a guide jaw 132. An eccentric lever 135 is linked to the tension bolt 133 . If the guide jaw should be adjusted relative to the cable,
The eccentric lever is in the position shown in FIG. 5, in which the guide jaw 132 is drawn into the groove of the holding rod 131 the deepest. After adjustment, the eccentric lever is shifted and presses the guide jaw against the cable jacket under the force of the compression spring, so that this guide jacket can follow a possibly non-circular running path and always ensures a reliable guidance of the cable jacket. guaranteed.

FIG. 6 shows a groove in the holding rod 131 which accommodates the radially elastically supported guide jaws, which groove allows it to receive the forces of the holding bolt which occur in the axial direction. This groove, unlike the one shown in FIGS. 4 and 5, does not open upwardly, but grips the guide jaw 132 above. If, for reasons of manufacturing technology, a circular groove cross-section is required, the maximum groove depth must be greater than the circular radius, so that even in this groove configuration the retaining rod can withstand axial forces. can receive.

[Brief explanation of the drawing]

1 is a sectional view of a high-voltage cable, FIG. 2 is a front perspective view of the manual instrument according to the invention, FIG. 3 is a rear perspective view thereof, and FIGS. 4 to 6 show different embodiments of the guide jaw. It is a diagram. 11...Support disk, 12, 13, 14...Guide guide, 15...Peeling blade, 16, 17, 18...
... Running surface, 21, 22, 23 ... Spiral groove, 24
...Adjustment disc, 25...Tightening lever, 31...
Wire mesh shield, 32... Conductive layer, 36... Covering sleeve, 37... Transition area, 122... Drive rod, 1
23... Peeling blade support, 124... Knurled screw, 125... Tightening lever, 126... Pin, 131... Holding rod, 132... Guide jaw,
133...Tension bolt, 134...Compression spring, 1
35...Eccentric lever.

Claims (1)

[Scope of Claims] 1. A manual instrument for stripping the outer skin layer of electrical conductors and cables, comprising a guiding device with an adjustable peeling blade and adaptable to the diameter of each conductor or cable, the guiding device comprising: It consists of three guide jaws 12, 13, 14 mounted on the support disc 11 and adjustable towards the center; one of these guide jaws 12, 13, 14 is equipped with a peeling blade 15. The guide jaws 12, 13, 14 are arranged such that they can be adjusted steplessly in the radial direction, and the guide jaws 12, 13, 14 have concave running surfaces 16, 17,
18, these running surfaces 16, 17, 18 have a predetermined pitch in the form of obtuse threads 19, 120, 121, and guide jaws 12, 13, 1
4 is an electrical conductor characterized in that it can be adjusted to the diameter of each conductor by an adjustment disk 24 provided with spiral grooves 21, 22, 23, and a drive rod 122 is provided on the support disk 11; A manual instrument for stripping the outer skin layer of cables. 2. Manual instrument according to claim 1, characterized in that at least one guide jaw 132 is radially elastically supported. 3. characterized in that an elastically supported guide jaw is mounted for radial movement into a groove of a retaining rod 131 which can be fixed to the support disk and is supported on this rod via a compression spring 134; A manual instrument according to claim 2. 4. A manual instrument according to claim 3, characterized in that the guide jaw is moved by a bolt 133 linked to an eccentric lever 135. 5. The support disk 11 according to any one of claims 1 to 4, characterized in that the support disk 11 has a radially extending T-shaped or swallowtail groove for accommodating a guide jaw or a holding rod. Manual instruments. 6. The manual instrument according to claim 5, characterized in that the holding rod has a groove for at least partially gripping the guide jaw. 7. Manual instrument according to claim 1, characterized in that the peeling blade (15) is arranged on a radially slidable support (123) by means of a knurled screw (124). 8. The manual instrument according to claim 7, wherein the peeling blade 123 is adjustable by a tightening lever 125. 9. The manual instrument according to claim 1 or 7, wherein the cutting angle of the peeling blade is 30° to 45°. 10. Hand-operated instrument according to claim 9, characterized in that, on the edge facing the support disk, a peeling blade is sharpened obliquely to its longitudinal axis. 11. Manual instrument according to any one of claims 1 to 10, characterized in that the support disk 11 is fixed to the adjustment disk 24 by a tightening lever 25.