DE19741640A1 - Portable cable stripper - Google Patents

Abstract

A cable stripper has a blade (4) in a safety gap (3) to protect against damage. The blade has a cutting depth of only one millimetre so that cutting into the cable wires is prevented. A ring around the cable is cut so that a section of sleeve can be pulled off. The knife may be U-shaped, with the blade on a longer leg of the knife. The short leg serves as a retaining clip when placed e.g. in a trouser back pocket. On the short leg is a small triangular blade (5) which can slit the cable sleeve and strip the cable using a longitudinal cut.

Description

The universal cable knife is used for stripping the jacket and the wires more commercially Telecommunication lines (e.g. I-Y (ST) Y 2 × 2 × 0.6 to 50 × 2 × 0.6) as well as from NYM 3 × 1.5 and NYM 5 × 1.5.

The stripping of cables is so common for electricians and telecommunications system electronics engineers Activity that the tool must always be at hand and available for this.

Cable knives of conventional design are bulky and therefore cannot be stowed in the back pocket. This is the main reason why mainly small carpets are used for stripping cables knives are used, but this is prohibited.

Carpet knives also offer the serious disadvantage of a high risk of injury. When using carpet knives there is also a great risk that the veins cuts or cuts the drain wire.

In addition, commercially available cable knives cannot be used as paint scratches to strip the Wires are used, which is why the side cutter is mostly used for this. It is it is not excluded that the pressure exerted on the copper wire causes a break point arises that may not be noticeable until much later in a malfunction (if the wire breaks completely).

The task is to create a secure cable knife that is small and handy in the back pocket is portable and suitable for stripping all everyday cables is. In addition, this knife should not cut into the wires when stripping, and besides can still be used as paint scratches. This cable knife must take advantage of the hand unity with security for hand and eye, and besides, you have to with it work even more reliably and, above all, faster than with a carpet meter ser. Who can only be expected if the handiness is given together with the speed that the cable knife is preferred to the carpet knives.

All of these requirements are met by the universal cable knife that I developed. One of my main goals was to provide reliable functionality and handiness to combine increased efficiency. So don't be fooled by the small size of the university versal cable knife. This is precisely what is intended, because only if it works without problems  stowable, it can be expected that it will displace the dangerous carpet knives. My invention follows from the knowledge that bans on professionally improper sales using carpet knives will not change behavior. You have to have an alternative create that is simply better.

The universal cable knife has the following features 1. Handy and practical U-shape

It consists of a flat, narrow piece of metal, which is shaped like a "U", but with a long leg ( 1 ) and a somewhat shorter leg ( 2 ) ( Fig. 1).

[Claim 2]

Such a form offers the following advantages:

• a) The universal cable knife can be easily inserted into the buttocks, as it is flat and narrow be inserted and carried there, the shorter leg similar to a ball writers serves as a bracket. So it is available at any time and quickly.
• b) The two opposite legs together form a handle that is easy to hold lies, and with which the knife in its three functions all-round cut, longitudinal cut with Guide and pliers function as paint scratches can be safely guided.
• c) Due to the U-shape, these three functions can be integrated in a particularly compact and handy form. When fully functional, my prototype is only 12 cm long, 1.5 cm wide and 1.5 cm high. Fig. 2 shows a scale representation of the universal cable knife in supervision.

2. Safety cutting edge for all-round cutting

At the front of the long leg ( 1 ) it has an all-round cutting edge ( 4 ) embedded in a security gap ( 3 ) of approx. 11 millimeters wide and approx. 3.5 millimeters deep, which protrudes approx. 1 millimeter. This cutting edge serves to add a circular cut around the cable to the jacket of a cable, whereupon the jacket can be removed and the wires can be exposed.

[Claim 1]

Such an arrangement offers the following advantages:

• a) As the cutting edge does not protrude more than 1.25 millimeters, as the experiment shows, is itself in the case of a line I-Y (ST) Y 2 × 2 × 0.6, damage to the wires or the additional wire can be expected sig excluded, only the coat is cut. Nevertheless, even NYM can be used Strip 3 × 1.5 just as cleanly and quickly.
• b) The cut automatically reaches the correct depth in order to completely separate the jacket.
• c) This is also the reason for the second advantage, which should not be underestimated. Stripping is much faster than with a carpet knife. You don't need it be careful not to hurt a vein, but can cut as quickly as possible possible to attach to the cable.
• d) The edge no longer needs to be used with a carpet knife every time you use it be retracted. The universal cable knife is therefore immediately available for the cut supply. This means a certain time advantage. As already mentioned, the speed with which a cable can be stripped, a decisive criterion for the Uni versal cable knife is preferred to the dangerous carpet knives.
• e) Safety in handling: Due to the gap with these dimensions and the position of the cutting edge injury to the fingers is almost impossible. Even if you slip and the knife hits a part of the body, the blade is protected in this way for no ver lead last.
• f) You can safely press the cable against the blade with your thumb, and on work this way with just one hand. Here, the cable from the gap in the right held in position.
• g) With this cutting edge, the screen and the protective plastic film can also be separated cleanly.
• h) With this cutting edge, thanks to the narrow shape of the cable knife and the (for the wires) safe cut with its complete loosening of the jacket, also a stripping of the Cable deep in a switch box quickly, reliably and easily possible. To this The long leg of the knife with the all-round cutting blade is used towards the end narrower.

3. Extendable triangular blade for slitting the jacket

The cable knife has an approx. 1.5 millimeter excellent triangular blade ( 5 ) on the short leg, which serves to add a longitudinal cut to a cable. The jacket can be easily removed in this way.

From I-Y (ST) Y 6 × 2 × 0.6 it is no longer possible to cover over pulling a larger distance (i.e. 20 centimeters) if you only use the circular Adds all-round cut. Sometimes, however, it is necessary to expose more than 20 centimeters of veins, so z. B. if you put on a distributor.

The triangular blade is attached to the cable jacket and pulled over the desired length. For this purpose, the short leg ends at an angle of 45 ° shaped (the knife can be attached better). Slashed in this way, can then separate the sheath from the cable.

To protect against injuries, this blade can be designed to be retractable and extendable, as with ordinary carpet knives. In this case, an extension mechanism ( 6 ) is preferred, which firmly locks in the two positions (retracted or extended) and can be operated with only one hand. (For example, the tool holders of tap sets have such a mechanism for changing the direction of rotation of the ratchet function).

[Claim 3]

Such an arrangement of the triangular blade offers the following advantages:

• a) Exact guidance:
  The long leg of the knife attached to the cable serves as a guide. By pulling it along the cable, it is ensured that the triangular blade cuts evenly in its center over the entire length of the jacket.
• b) The guide is variable for cables of different thickness:
  Now different cables have different diameters. To add a longitudinal section evenly along the middle to the thinner lines IY (ST) Y 4 × 2 × 0.6 and IY (ST) Y 6 × 2 × 0.6, you simply have to cut the two legs of the knife squeeze accordingly and automatically get the correct distance between the triangular blade and the guide.
• c) The triangular blade does not cut any veins because it is fixed in the correct length:
  The well-known Jokari cable knives with their adjustable blade (or mandrel) may be ideally suited for stripping NYM, however, the adjustability of the blade is disadvantageous when stripping telecommunication lines. This changes because of the circular all-round cut. When stripping telecommunication lines, tenths of a millimeter are important to ensure that the wires are not damaged. Since the mandrel blade is adjustable, its position must be checked more often, always with the risk that the wires of the cable will be damaged. There is not much play between stripping properly by cutting lengthways and cutting or cutting the wires. The universal cable knife does not have this disadvantage because its blade is fixed from the outset for the longitudinal cut and, due to its size, cannot cut deeper into the cable than the sheath is thick. Nevertheless, stripping NYM with a longitudinal cut is just as possible as with IY (ST) Y 4 × 2 × 0.6 or IY (ST) Y 100 × 2 × 0.6.
• d) Serious injuries (deep cuts) are definitely excluded because of the triangle blade does not protrude more than 1.5 millimeters. The long leg of the knife forms also some protection against cutting yourself in case you slip and that Knife hits a part of the body. In addition, the triangular blade can protect against ver endings can be designed to be pushed in and pushed out as with conventional carpet knives.

4. Integrated paint scratch pliers

At the end of the short leg and opposite are pointed (approx. 0.4 mm high) lacquer scratch edges ( 7 ), which are used to scrape the lacquer off the wire and to expose the copper wire. Here, the U-shape of the knife is used as pliers, as with conventional paint scratches, by pressing the two legs together. The lacquer is clamped between these two "biting" edges, and then wire is removed from the front.

[Claim 4]

Such an arrangement of paint scratch edges offers the following advantages:

• a) Since this does not exert as much pressure as it does through the leverage of one side Schneider is the case, there is no danger of penetrating thin copper wire (0.4 or 0.6) nen.
• b) Two tools are usually used for stripping cables and their wires:
  A knife and the side cutter. To strip the wires, the side cutter is usually used instead of using a paint scratch. This is bad, because only when using a lacquer scratcher is it impossible to break the wires later (in contrast to using a side cutter).

If you carry the universal cable knife with you, you have the right work stuff for stripping the wires (a paint scratch) and does not need the wire for this to take cutters. Greater efficiency can also be expected from this, since the Abiso polishing is faster than with the side cutter.

Reference list

( 1 ) Long leg
( 2 ) Short leg
( 3 ) security hole
( 4 ) All-round cutting edge
( 5 ) triangular blade
( 6 ) eject mechanism
( 7 ) Paint scratch edges

Claims (4)

1. Cable knife for stripping the sheath and the wires of all common telecommunication lines (from e.g. IY (ST) Y 2 × 2 0.6 to IY (ST) Y 50 × 2 × 0.6 suitable) and from NYM 3 × 1.5 or NYM 5 × 1.5, characterized in that it has a blade ( 4 ) embedded in a security gap ( 3 ) to protect against injuries. This blade also only has a cutting depth of approx. 1 millimeter, which reliably prevents a cut in the cable wires. Only the sheath is cut, since the low cutting depth of the blade prevents it from being cut deeper. By means of this blade you can make a circular cut around the cable so that you can remove the sheath. In a U-shaped version of the knife, this blade is located on the long leg of the knife. 2. Cable knife according to protection claim 1, characterized in that it has a flat, narrow "U" shape ( Fig. 1), with a short ( 2 ) and a long angle ( 1 ). The short leg serves as a holding bracket (similar to the holding bracket of ballpoint pens) when you put the knife in the back pocket. 3. Cable knife according to protection claim 2, characterized in that a small triangular blade ( 5 ) is attached to the short leg. This is used to slit the cable jacket and stripping through a longitudinal cut. The long leg ( 1 ) of the knife serves as a guide. This blade also does not endanger the veins due to its small size and its limited protrusion (approx. 1.5 millimeters). In addition, this blade can be designed to protect against injuries (as with ordinary carpet knives) so it can be pushed in and out ( 6 ). 4. Cable knife according to protection claim 2, characterized in that there are two paint scraping edges ( 7 ) on the knife: one on each leg (paral lel). These lacquer scratch edges are there for stripping the wires and removing the insulation from the wire. In this function as a lacquer scraper, the knife is guided like a pair of pliers, ie the insulation of the wires is pressed together between the two lacquer scratch edges of the knife, whereupon the lacquer is removed from the wire.