GB2212340A

GB2212340A - Cutting tool for the removal of cable sheaths

Info

Publication number: GB2212340A
Application number: GB8826111A
Authority: GB
Inventors: Josef Krampe
Original assignee: Individual
Current assignee: Individual
Priority date: 1987-11-12
Filing date: 1988-11-08
Publication date: 1989-07-19
Also published as: GB8826111D0; ES2011405A6; IT8848542A0; SE8803586D0; FR2623342A1; IT1235147B; SE8803586L; JPH01161304A; DE3738419A1

Description

j CUTTING TOOL7OR THE REMOVAL OF CABLE SHEATHS This invention relates to a

cutting tool for the 2212340 removal of cable sheaths, particularly but not exclusively sheaths of glass fibre cables, by means of cutting blades which slit the sheath, the cable being fed to the cutting blades by lever drives.

A series of publications deal with the problem of being able to remove cable sheaths in a simple manner. Thus, for example, in German specification DT-OS 23 06 031 a cutting tool is described which has in the zone of the blade at least one gear wheel which can be actuated manually through a lever drive which acts on the cable sheath to produce the forward feed. By the use of one or more gear wheels directly acting on the cable sheath, the power transmission for the progression of the blade takes place in the immediate vicinity of the slitting blade and in the direction of the surface of the sheath, so that a good cutting guide in the cable axis is achieved. The gearwheel or gear wheels respectively, can be actuated in a simple manner by a lever drive, where necessary by gearing.

It is a drawback that, as a rule, manually operated tools can only be employed for the separation of thinwalled cable sheaths. Many cable sheaths are either too hard or too thick. In both cases it is not considered possible to carry out perfect cuts or cutting guides without damage to the inside of the cable by a hand tool even with lever drive or lever drive with gearing.

The aim of the invention is to create a cutting tool for cable sheaths which can be employed for recent sheath designs, e. g. with strong plastic sheaths and laminated insulation coverings, i.e. insulations consisting of various materials, and which has a force expenditure which is in keeping with the possibilities of use of a hand tool.

According to the invention there is provided a cutting tool for the removal of cable sheaths by means of blades for slitting the sheath, the cable being fed to the blades by lever drives characterised in that said apparatus comprises a housing, a bore arranged through said housing for transit of a cable therethrough, a manually actuated lever operated drive pair each of said lever operated drive pair being supported by a lever, said lever operated drive pair being supported in front of the blade in the direction of transport of the cable.

The cutting tool according to the invention comprises a lever-operated drive pair in a housing to guide the cable which is to be stripped. The tool may be operated, for example, by two hands for the forward feed. That is the full manual effort can be Z,, iez p 1 3 employed for the stripping process.

In order that the invention may be more fully understood a specific embodiment thereof will now be described by way of example, in which:Fig. 1 is a front view of the cutting tool of the invention, Fig. 2 is a side view of Fig. 1, Fig. 3 is a cross-section through the tool along the line AA of Fig. 2, and Fig. 4 is a plan view of Fig. 1.

In the embodiment of the invention, the tool comprises a practically rectangular housing which is made up of the housing sections 1,2, which are on the two sides of the widths joined to each other detachably by opposing fish-plates 3, 4. Wing screws 5, 6 are used for this. In the centre of the housing the face edges of the housing section 1, 2 which abut each other are bevelled along their lengths and thus form a bore 7 which runs vertically through the housing sections 1, 2. The bore 7 is used for guiding the_ cable 8 to be stripped during transport to the cutting blades 9, 10, or, respectively, their cutters. The cutting blades 9, 10 are arranged in blade holders 11, 12, which are for their part guided in a channel 13 transversely to the bore 7 and can be slid lengthwise towards said shaft 7, the sliding movement being limited by the screws 14, 15 arranged on the housing side, which engage in the elongated holes 16, 17 of the blade holders 11, 12. In addition, the cutting blades 9, 10 in the blade holders 11, 12 can be adjusted to produce an outward pressure by means of springs 18, 19 via the screws 20, 21. Another particular feature of this embodiment of the invention is the guide runners 22, 23 at the lower side of the cutting blades 9, 10. They are diametrically opposite each other in the bore 7 and have the purpose of guiding the cable 8 appropriately for a precise incision of the cutting blades 9, 10 into the insulation.

On the faces of the housing sections 1, 2, pocketshaped recesses 24, 25 are located below the blade holders 11, 12 or their channel 13, on both sides of the bore 7. In the recesses 24# 25 elbow-angled elongated holes 26, 27 are provided. They are used to accept and guide the spigots 30, 31 to be found on the levers 28, 29.. In this embodiment the levers 28, 29 have toothed heads-32, 33 which engage in the cable insulation. The movement manually exerted onto the levers 28, 29 brings the heads 32, 33 into rotational movement through the spigots 30, 31, the cable 8 being transported through the bore 7 with slitting of the insulation 35 by means of the cutters 9, 10. rig. 3 shows the cutting tool in the cutting position.

In Fig. 3 only the semicircular part of the insulation 35 behind the drawing plane of section is shown above the cutters 9, 10, the front part being omitted for clarity.

The tool of the invention can therefore be suited to many different cable thicknesses by varying the distances of the housing sections 1, 2 accordingly, which, can be done by simply releasing the wing screws 5, 6 and adjusting the housing sections 1, 2 away from or towards each other in the corresponding elongated holes 34 of the fish-plates 3, 4.

The blade holders 11, 12 can be rotated by 900 in the channel 13, so-that the cutting tool according to the invention is then suitable for making circular cuts. The levers 28, 29, however, then remain out of action, and the cutting tool is in this case only rotated around the axis of the cable 8.

It is to be understood that the above described embodiment is for illustrative purposes only.

Claims

CLAIMS 1. A cutting tool for the-removal of cable sheaths by means of

blades for slitting the sheath, the cable being fed to the blades by lever drives characterised in that said apparatus comprises a housing, a bore arranged through said housing for transit of a cable therethrough, a manually actuated lever operated drive pair, each of said lever operated drive pair being supported by a lever, said lever operated drive pair being supported in front of the blade in the direction of transport of the cable.
2. A cutting tool as claimed in claim 1, characterised in that said housing"comprises two housing sections placed together so as to define a bore therebetween, the two housing sections being relatively adjustable so as to enable the size of said bore to be varied, said housing sections each comprising a pocket shaped recess adjacent the bore 13, said pocket shaped recesses being situated below a channel, blade holders being situated in said channel.
3. A cutting tool as claimed in claims 1 and 2, characterised in that each of the levers is supported in a knee angled elongate hole provided in a recess in a housing section.
4. A cutting tool as claimed in any preceding claim, characterised in that a channel passes through the 1k t In 7 - 7 housing at an angle transverse to the bore, two diametrically opposed blade holders being positioned in said channel on opposite sides of the bore, a blade being supported by each blade holder via a spring such that the blades are supported transversely to the axis of a cable situated in the bore, and the blades may project into the cable sheath.
5. A cutting tool as claimed in any preceding claim, characterised in that said cutting tool comprises guide runners for the blades, said guide runners being situated adjacent the bore and below the blades.
6. A cutting tool as claimed in any preceding claim, characterised in that. the blade holders may be adjusted by screws arranged on the housing sections, said screws engaging elongated holes provided on the blade holders.
7. A cutting tool as claimed in any preceding claim, characterised in that the housing sections are relatively adjustably attached on the longitudinal sides thereof by fish-plates via wing screws.
8. A cutting tool as claimed in any of claims 1 to 7, characterised in that each of the housing sections comprises a bevelled region, the bevelled regions in combination defining the bore.
9. A cutting tool as hereinbefore described with reference to the accompanying drawings.

Published 1989 at The Patent Office, State House, 56/71 High Holborn, London WClR 4TP. Further copies may be obtained from The Patent OlEm Sales Branch, St Mary CraY, Orpington, Kent BR5 3RD. Printed by Multiplex techniques ltd, St Mary Cray, Kent, con. 1/87