DE3009888C2 - Cable sheath cutter for longitudinal slitting of plastic cable sheaths - Google Patents

Description

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The invention relates to a cable sheath cutter for longitudinally slitting plastic cable sheaths, consisting of a knife holder for an from the outside to the Cable attachable knife, which at its end facing the cable core one to both sides has angled approach to the knife edge, and a hand lever with a toothed end for moving the knife carrier on the. Cable sheath, where the one from the cable seen as a function of the radial distance between the toothed end and the angled attachment adjustable by the thickness of the cable sheath, as well as with a protection for the knife when not in use.

Such a cable sheath cutter is included in the assembly brief from Siemens (S 45 055 - M 115 - P321, edition, March 1976). This cable sheath cutter is used for longitudinally slitting plastic cable sheaths and consists of essentially consists of a knife carrier in which a knife is firmly inserted, with which the cable sheath of the Can be slotted lengthwise. A is used to move the knife on the cable jacket Hand lever which is rotatably arranged in the knife carrier about an axis and on which the cable jacket or the The side facing the knife has a sharp-edged, curved toothing.

In use, the cable sheath cutter is placed on the cable sheath and pressed down of the hand lever, the arc-shaped toothing rolls off the cable sheath as a result of the leverage effect. As a result, the knife carrier and thus also the knife along a surface line of the cable jacket pulled along, whereby the incision is made in the cable sheath with the knife however, the knife is fixed and protruding and the incision depth is adjusted accordingly An eccentric on the axis of the hand lever is regulated. Here, however, it cannot be avoided that the knife is always exposed, so that there is a great risk of injury to the fitter during assembly work, especially when the device slips off the cable jacket during the work process

The same problems occur with the cable sheath cutter according to DEAS 24 02 377. This cable sheath cutter is also used for longitudinally slitting plastic sheaths and consists of a knife holder for a knife that can be placed on the cable from the outside and a hand lever with a toothed end for moving the knife holder on the cable sheath. In the idle state, the knife is probably covered by a device, but for use this knife must be exposed and remains so until it is covered again by hand. While working, however, there is still a risk of injury to the fitter from the exposed knife.

From the French patent specification 15 97 929 a device for stripping, for example, wires known knives with corresponding notches in the cutting edges are arranged opposite one another. The wires to be stripped will eventually go into the notches between the two cutting edges The insulation is created by pressing the blades held back by springs against each other cut and can then be peeled off. However, this type of cutting device cannot be used for Longitudinal cutting of a cable jacket can be used. Furthermore, the risk of injury is right low, as the knives do not protrude over the device.

The object of the invention was now to provide a cable maize cutter of the type described above to create, in which the knife is arranged protected when the device is idle and only in the actual working state, which is only through immediate Operation of the device is given, frsi is The task set is according to the invention with a Cable sheath cutter solved in that the knife is attached to a slide that is in a Guide channel of the knife carrier is slidably arranged that a return spring between the Knife carrier and the slide is arranged so that the knife in the rest state in the protection bidding Guide channel for the slide is retractable by hand in its working position against the force of the Return spring can be brought that engages in the slide a fixing screw for fixing the knife and in a side recess of the knife carrier to limit the straight lifting or lowering movement of the slide is guided.

A great advantage of the invention can be seen in the fact that the knife in the knife carrier so is far withdrawn that a risk of injury is excluded. It is essential that this Idle state, i.e. retrieving the knife immediately after the end of the working state is taken automatically. The cable sheath cutting

it is now designed so that the knife is fixed in a movable slide that can be guided up and down in a guide channel. As a result, the knife can be withdrawn so far that it does not protrude beyond the limits of the knife carrier. With the help of a return spring, which is arranged between the movable slide and the knife carrier, it is achieved that the slide on the knifeless side is pushed out so far that the knife fastened in it is on the other side just withdrawn in the guide channel.This spring force ensures that the knife is sunk in the guide channel when at rest is extended. On the other hand, the knife takes place upon release of the slider due to the Federkaft automatically into the guide channel back, so that then a risk of injury isL The slider is no longer limited gegebeu by the knife by corresponding latching means in its stroke movement This limitation can now be carried out so that so that the cutting depth of the knife can be determined. The setting of the cutting depth is important because the knife may only be lowered so far that the thickness of the cable jacket is just taken into account. Further lowering would damage the cable core. At the lower end, the knife also has a dune attachment which is angled on both sides and which rests tangentially on the detached part of the cable when the knife is lowered. This widening at the end of the knife prevents the cable core from being damaged by the knife edge when it is placed on the knife as well as during the subsequent incision; because this approach is slidably guided on the cable core during the incision underneath the cable jacket. This also has the consequence that the knife itself is held in the working position during the cutting process, so that the slide no longer has to be pressed in this working phase. The cutting depth of the knife can, however, also be adjusted by moving the hand lever axis with the aid of an eccentric. In addition, the knife is drawn into the cable jacket along a surface line by depressing the hand lever, the end of the hand lever, held in the axis of the knife carrier and formed in the shape of a circular arc, rolling on the cable jacket. Corresponding toothing increases friction and prevents slipping.

The invention will now be explained in more detail with the aid of a figure in which the mode of operation is also shown at the same time explained.

In the figure, the use of the cable sheath cutter is shown on a cable 14, the cable sheath is cut starting from the point of the cable jacket along a jacket line. Of the Cable sheath cutter consists of a knife holder 1, in or on which all operating elements are arranged. The slide 7 can thus be moved up and down in a guide channel which is not visible here. At to one end of the slide 7 facing the cable 14, a knife 4 is fastened with a fixing screw 6, this makes it possible for this knife 4 to be exchanged in a simple manner. the The fixing screw 6 is accessible laterally in an elongated recess 5. When moving the With the slide 7, this fixing screw 6 is moved along with it and, by appropriate coordination, with the recess 5 this also provides a safeguard against twisting of the slide 7 and thus of the knife 4. Furthermore, due to the length of the recess 5, the possible lift or lowering height of the slide 7 within of the guide channel. This lifting and lowering movement is indicated in the figure by the double arrow 10 indicated, wherein the position shown represents the working state, that is, the knife 4 is

ίο lowered with the slider 7 until the Angled extension 16 at the lower end of the knife 4 rests tangentially on the remote cable core Now the incision can be made in the cable jacket. The required movement of the knife 4 along a surface line of the cable 14 is carried out by depressing the hand lever 2 in the dashed line there drawn position. This hand lever 2 is mounted in an adjustable axis on the knife carrier 1, so that as a result, the curved end 3 with a toothing on the cable sheath of the cable 14 can roll off. The axis is adjusted with the aid of a rotatable eccentric 11. By turning of the eccentric 11 in different marking positions 12 is the distance to the cover side of the knife carrier 1 changed and this causes different depths of incision of the knife 4, since the distance between the Knife carrier ί and the cable jacket with the same knife position is decisive for the cutting depth. As already mentioned, the knife 4 is only allowed so far

3 (i can be lowered so that the cable jacket is in its whole strength is just grasped. According to the invention is between the slide 7 and the Knife carrier 1 a return spring 8 arranged in a bore 9 of the knife carrier 1 so that it is in unloaded rest position pulls the slide 7 out of the guide channel up to the stop. As a result, the knife 4, which is attached to the slide 7, moves into the guide channel and is thus protected. the Risk of injury from the knife 4 in the idle state

• Ό is no longer given. However, that means that at the beginning of the working state, the slide 7 must be pressed in order to put the knife 4 in the functional position bring. As soon as the slide 7 is released, the knife 4 automatically snaps back, so that too For example, in the event of the cable sheath slipping, there is hardly any risk of injury from the knife 4 consists. Only when the angled extension 16 is inserted under the cable jacket is this superfluous Press down. The slide 7 has in this

so embodiment at the upper end a protrusion on, on which the return spring 8 acts. By appropriate training of an abutment 15 with A cutting depth adjustment of the knife can also be made here at various height adjustments will; because different depths of penetration of the slide 7 in the guide channel means that on the the other side the knife 4 is extended more or less far. That would be the penetration depth additionally adjustable. However, it could also be due to the adjustment by the eccentric 11, for example can be dispensed with, which may simplify the structure. At the foot of the knife carrier 1 is finally a retaining spring 13 arranged in a known manner, through which the incision length in

^b5 cable sheath can be determined. The length of this retaining spring 13 also defines the length of the incision, for example if it is determined that the incision has the correct length when the end

the retaining spring 13 has just reached the settling edge of the cable jacket. Another way to Adjustment of the depth of penetration of the knife 4 into the cable sheath can be achieved by means of appropriate attachments can be achieved, which are placed on the knife side of the knife carrier I. This causes the knife 4 to stand no longer as far in front of it and can therefore no longer penetrate as deeply.

1 sheet of drawings

Claims (2)

Patent claims: 1. Cable sheath cutter for longitudinal slitting of plastic cable sheaths, consisting of a knife holder for a cable j attachable knife, one on both sides at its end facing the cable core has angled approach to the knife edge, and a hand lever with a toothed end for moving the knife carrier on the cable jacket where the cable is seen from the radial distance between the toothed end and the angled attachment in Depending on the thickness of the cable jacket is adjustable, as well as with a protection for the Knife in the idle state, characterized in that the knife (4) on a slide (7) is attached, which is arranged displaceably in a guide channel of the knife carrier (1) that a return spring (8) is arranged between the knife carrier (1) and the slide (7) so that the Knife (4) can be lowered into the protection guiding channel for the slide (7) when at rest, which can be brought into its working position by hand against the force of the return spring (8) that in the Slide (7) engages a fixing screw (6) for fixing the knife (4) and in a lateral Recess (5) of the knife carrier (I) to limit the straight stroke or lowering movement of the Slide (7) is performed. 2. Cable sheath cutter according to claim 1, characterized in that an adjustable abutment (15) between the slide (7) and the Knife carrier (1) is arranged with which the depth of penetration of the knife (4) into the cable sheath is adjustable.