CA1200079A - Tool for stripping the covering from a wire- containing cable - Google Patents
Tool for stripping the covering from a wire- containing cableInfo
- Publication number
- CA1200079A CA1200079A CA000423094A CA423094A CA1200079A CA 1200079 A CA1200079 A CA 1200079A CA 000423094 A CA000423094 A CA 000423094A CA 423094 A CA423094 A CA 423094A CA 1200079 A CA1200079 A CA 1200079A
- Authority
- CA
- Canada
- Prior art keywords
- shank
- covering
- tool
- hook
- cutting edge
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G1/00—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines
- H02G1/12—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines for removing insulation or armouring from cables, e.g. from the end thereof
- H02G1/1202—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines for removing insulation or armouring from cables, e.g. from the end thereof by cutting and withdrawing insulation
- H02G1/1204—Hand-held tools
- H02G1/1229—Hand-held tools the cutting element making a longitudinal, and a transverse or a helical cut
Landscapes
- Removal Of Insulation Or Armoring From Wires Or Cables (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
The tool is composed of a shank having a cutting edge and a handle attached at one end to the shank. An S-shaped hook extends from the opposite end of the shank and is provided with a sharpened edge which faces the edge of the shank. An L-shaped guide is attached to the shank and is moveable with respect to a second cutting edge on the shank. The latter edge is used to cut the covering of a wire-containing cable circumferentially and the guide controls the depth of the cut.
The tool is composed of a shank having a cutting edge and a handle attached at one end to the shank. An S-shaped hook extends from the opposite end of the shank and is provided with a sharpened edge which faces the edge of the shank. An L-shaped guide is attached to the shank and is moveable with respect to a second cutting edge on the shank. The latter edge is used to cut the covering of a wire-containing cable circumferentially and the guide controls the depth of the cut.
Description
1~:00079 BACKGROUND OF THE INVENTION
This invention relates to a tool for stripping the outer covering or sheath from a wire-containing cable and more particularly to a tool having means for con-trolling the depth of cut in the covering or sheath in order to minimize damage to the insulated wires within the cable.
Tools for removing the outer covering or sheath from a wire-containing cable commonly consist of a shank having a curved blade or hook for ma]cing a longitudinal cut in the covering. A bead or protuberance is formed at the free end of the blade for separating the covering from the wires within the cable and for guiding the tool as it is drawn along the cable. Examples of such tools are illustrated in U.S. Patents No. 1,187,386 to Pehrson, No. 4,145,808 to Walsh, No. 3,092,906 to Deering and East German Patent No. 31,543 to Lose et al.
Before the tool can be used to make a longitudinal cut in the covering, the covering must be severed circum-ferentially so that the bead or protuberance can beinserted beneath the covering. The blade of the tool can be used for this purpose, however, known tools frequently lack effective means for preventing the blade from cutting the insulated wires underlying the covering. If the ins~ulation is inadvertently cut or nicked, the cable may have to be discarded entirely to prevent injury or damage.
Known tools frequently also lack means for ensuring that the depth of cut remains uniform as the tools are drawn longitudinally along a cable. Lacking such means the blade tends to skim over the peaks of the insulated '~
.,v .. .....
~ZOC~0~9 wires within the covering and to dig into hollows between the wires. The risk of damage to the insulation is greater where the blade moves in this fashion than where the blade makes a cut of uniform depth in the covering.
SUMMARY OF THE INVENTION
It is, accordingly, an object of this invention to provide a tool having means for controlling the depth of cut in order to prevent inadvertent damage to insulated wires beneath the outer covering or sheath.
Another object of the inevention is to provide a tool having means for causing the blade to follow the twist of wires within the covering as the tool is moved parallel to the longitudinal axis of the cable to minimize the tendency of the blade to skim over the peaks and dig into hollows of insulated wires within the cable.
These and other objects are accomplished by a tool for stripping the covering from a wire-containing cable comprising a shank having a cutting edge for severing the covering; a hook extending from the shank and having an edge which faces an edge of the shank, both the edges being sharpened for severing the covering. The hook is S-shaped in order to ensure that the depth of cut is uniform as the tool is drawn along the longitudinal axis of the cable. A guide is moveably mounted to the shank for adjusting the depth of cut made by the cutting edge in the cover as the tool is drawn around the circumference of the covering.
DESCRIPTION OF THE DRAWINGS
The invention is described in detail with :
~ lZ00079 reference to the accompanying drawings in which:
Figure 1 is an elevation of the tool of the invention shown in conjunction with a wire-containing cable;, Figure 2 is a perspective view of the tool and cable;
Figures 3 and 4 are enlarged perspective views of the forward end of the shank of the tool;
Figure 5 is an elevation of the shank of the tool from the handle side thereof;
Figure 6 is an elevation of the shank viewed in the direction of arrows 6-6 in Figure 4;
Figure 7 is a plan view of the tool;. -_A
Figure 8 is a perspective view oE the`tool used to cut the cable circumferentially; and Figure 9 is a section of the cable and an elevation of the tool viewed in the direction of arrows 9-9 in Figure 8.
Like reference characters refer to like parts throughout the description of the drawings.
DESCR:IPTION OF THE PREFERRED EMBODIMENTS
With reference to Figure 1, the tool of the invention indicated generally by the numeral 10 is shown in conjunction with a cable 11. The tool is composed of a handle 12, shank 14, a hook 16 and a guide 18. The hook extends back towards the handle from the opposite end of the shank and a protuberance or ball 20 is,l formed at the outermost end of the hook. The inside edge 22 of the hook which faces the shank is sharpened as is the facing edge 24 " ~20C~079 of the shank. Both edges are sharpened to vertex 26.
With reference to Figure 3 ball 20 is connected to a threaded shank 28 which is removably received in a threaded bore in the free end of the hook 16. The illu-strated ball can be replaced by balls of larger or smaller diameter in order to adjust the depth of cut made by the tool.
Guide 18 is composed of two limbs 30, 32 dis-posed normal to each other. One limb 30 is disposed parallel to the face 34 of the shank and has two slot-shaped apertures 36, 38 for receipt of locking screws 40, 42. The forward end of the screws are threadably received in apertures 44, 46 in the shank. The edge 48 of the shank above the guide is sharpened to form a cutting edge.
With reference to Figures 4 and 7 cutting edge 24 is parallel to the longitudinal axis 70-70 of the shank and both the axis and the cutting edge lie in an imaginary plane marked 71. Hook 16 is generally S-shaped and has one extent 72 which lies on one side of plane 71 and another extent 74 which lies on the opposite side of the plane. Ball 20 is intersected by the same plane.
An S-shape is the preferred configuration of the hook but the hook may have other curved configurations such as a C-shape. Whatever confi~uration is chosen, the degree of curvature should preferrably be relatively small.
The curved shape has been found to facilitate the cutting of the covering of the cable to a uniform depth as the tool is drawn longitudinally in the manner illustrated in Figure 2.
Guide 18 acts to limit the depth of cut by the ~2000~9 cutting edge 48. The operation of the guide is described with reference to Figures 4 to 6. Locking screws 40, 42 are first loosened and the guide is slid in the direction of arrow 49 in Figure 5 until the distance between cutting edge 48 and the surface of limb 32 which faces the cutting edge, measured in a direc~ion normal to the plane of that surface, is approximately the same as the thickness of the covering of the cable. This distance is marked 50 in Figure 6 and the thickness of the covering is marked 52 in Figure 2.
The tool is then held as illustrated in Figure 9 such that the outstanding limb 32 of the guide contacts the outer wall 53 of the covering and is disposed tangentally of the cross section of the cable. The tool is then rotated about the cable in order to cause the cutting edge 48 to make a circumferential cut 60 in the covering. The guide is pressed against the covering as the circumferential cut is made thereby effectively severing the covering but not penetrating beneath the covering and damaging the insulated wires 64 therein.
After the circumferential cut is made, the sharpened edges of the hook and shank are used to cut the covering in a direction parallel to the longitudinal axis of the cable. That operation is described with reference to Figures 1 and 2. Hook 16 is first inserted through the circumferential cut 60 into the space beneath the covering and the tool is then drawn in a direction parallel to the longitudinal axis of the cable. Ball 20 separates the covering from the wires within the cable and guides the tool in a spiral direction where the wires within the cable 12000~79 are twisted. As illustrated in Figure 2 the sharpened edges 22, 24 of the hook and shank serve to sever the covering as the tool is moved along the cable. The covering can again be cut circumferentially at the end of the longitudinal cut in order to remove the covering from the cable.
It will be understood, of course, that modifi-cations can be made in the preferred embodiments described herein without departing from the scope and purview of the invention as defined in the appended claims.
This invention relates to a tool for stripping the outer covering or sheath from a wire-containing cable and more particularly to a tool having means for con-trolling the depth of cut in the covering or sheath in order to minimize damage to the insulated wires within the cable.
Tools for removing the outer covering or sheath from a wire-containing cable commonly consist of a shank having a curved blade or hook for ma]cing a longitudinal cut in the covering. A bead or protuberance is formed at the free end of the blade for separating the covering from the wires within the cable and for guiding the tool as it is drawn along the cable. Examples of such tools are illustrated in U.S. Patents No. 1,187,386 to Pehrson, No. 4,145,808 to Walsh, No. 3,092,906 to Deering and East German Patent No. 31,543 to Lose et al.
Before the tool can be used to make a longitudinal cut in the covering, the covering must be severed circum-ferentially so that the bead or protuberance can beinserted beneath the covering. The blade of the tool can be used for this purpose, however, known tools frequently lack effective means for preventing the blade from cutting the insulated wires underlying the covering. If the ins~ulation is inadvertently cut or nicked, the cable may have to be discarded entirely to prevent injury or damage.
Known tools frequently also lack means for ensuring that the depth of cut remains uniform as the tools are drawn longitudinally along a cable. Lacking such means the blade tends to skim over the peaks of the insulated '~
.,v .. .....
~ZOC~0~9 wires within the covering and to dig into hollows between the wires. The risk of damage to the insulation is greater where the blade moves in this fashion than where the blade makes a cut of uniform depth in the covering.
SUMMARY OF THE INVENTION
It is, accordingly, an object of this invention to provide a tool having means for controlling the depth of cut in order to prevent inadvertent damage to insulated wires beneath the outer covering or sheath.
Another object of the inevention is to provide a tool having means for causing the blade to follow the twist of wires within the covering as the tool is moved parallel to the longitudinal axis of the cable to minimize the tendency of the blade to skim over the peaks and dig into hollows of insulated wires within the cable.
These and other objects are accomplished by a tool for stripping the covering from a wire-containing cable comprising a shank having a cutting edge for severing the covering; a hook extending from the shank and having an edge which faces an edge of the shank, both the edges being sharpened for severing the covering. The hook is S-shaped in order to ensure that the depth of cut is uniform as the tool is drawn along the longitudinal axis of the cable. A guide is moveably mounted to the shank for adjusting the depth of cut made by the cutting edge in the cover as the tool is drawn around the circumference of the covering.
DESCRIPTION OF THE DRAWINGS
The invention is described in detail with :
~ lZ00079 reference to the accompanying drawings in which:
Figure 1 is an elevation of the tool of the invention shown in conjunction with a wire-containing cable;, Figure 2 is a perspective view of the tool and cable;
Figures 3 and 4 are enlarged perspective views of the forward end of the shank of the tool;
Figure 5 is an elevation of the shank of the tool from the handle side thereof;
Figure 6 is an elevation of the shank viewed in the direction of arrows 6-6 in Figure 4;
Figure 7 is a plan view of the tool;. -_A
Figure 8 is a perspective view oE the`tool used to cut the cable circumferentially; and Figure 9 is a section of the cable and an elevation of the tool viewed in the direction of arrows 9-9 in Figure 8.
Like reference characters refer to like parts throughout the description of the drawings.
DESCR:IPTION OF THE PREFERRED EMBODIMENTS
With reference to Figure 1, the tool of the invention indicated generally by the numeral 10 is shown in conjunction with a cable 11. The tool is composed of a handle 12, shank 14, a hook 16 and a guide 18. The hook extends back towards the handle from the opposite end of the shank and a protuberance or ball 20 is,l formed at the outermost end of the hook. The inside edge 22 of the hook which faces the shank is sharpened as is the facing edge 24 " ~20C~079 of the shank. Both edges are sharpened to vertex 26.
With reference to Figure 3 ball 20 is connected to a threaded shank 28 which is removably received in a threaded bore in the free end of the hook 16. The illu-strated ball can be replaced by balls of larger or smaller diameter in order to adjust the depth of cut made by the tool.
Guide 18 is composed of two limbs 30, 32 dis-posed normal to each other. One limb 30 is disposed parallel to the face 34 of the shank and has two slot-shaped apertures 36, 38 for receipt of locking screws 40, 42. The forward end of the screws are threadably received in apertures 44, 46 in the shank. The edge 48 of the shank above the guide is sharpened to form a cutting edge.
With reference to Figures 4 and 7 cutting edge 24 is parallel to the longitudinal axis 70-70 of the shank and both the axis and the cutting edge lie in an imaginary plane marked 71. Hook 16 is generally S-shaped and has one extent 72 which lies on one side of plane 71 and another extent 74 which lies on the opposite side of the plane. Ball 20 is intersected by the same plane.
An S-shape is the preferred configuration of the hook but the hook may have other curved configurations such as a C-shape. Whatever confi~uration is chosen, the degree of curvature should preferrably be relatively small.
The curved shape has been found to facilitate the cutting of the covering of the cable to a uniform depth as the tool is drawn longitudinally in the manner illustrated in Figure 2.
Guide 18 acts to limit the depth of cut by the ~2000~9 cutting edge 48. The operation of the guide is described with reference to Figures 4 to 6. Locking screws 40, 42 are first loosened and the guide is slid in the direction of arrow 49 in Figure 5 until the distance between cutting edge 48 and the surface of limb 32 which faces the cutting edge, measured in a direc~ion normal to the plane of that surface, is approximately the same as the thickness of the covering of the cable. This distance is marked 50 in Figure 6 and the thickness of the covering is marked 52 in Figure 2.
The tool is then held as illustrated in Figure 9 such that the outstanding limb 32 of the guide contacts the outer wall 53 of the covering and is disposed tangentally of the cross section of the cable. The tool is then rotated about the cable in order to cause the cutting edge 48 to make a circumferential cut 60 in the covering. The guide is pressed against the covering as the circumferential cut is made thereby effectively severing the covering but not penetrating beneath the covering and damaging the insulated wires 64 therein.
After the circumferential cut is made, the sharpened edges of the hook and shank are used to cut the covering in a direction parallel to the longitudinal axis of the cable. That operation is described with reference to Figures 1 and 2. Hook 16 is first inserted through the circumferential cut 60 into the space beneath the covering and the tool is then drawn in a direction parallel to the longitudinal axis of the cable. Ball 20 separates the covering from the wires within the cable and guides the tool in a spiral direction where the wires within the cable 12000~79 are twisted. As illustrated in Figure 2 the sharpened edges 22, 24 of the hook and shank serve to sever the covering as the tool is moved along the cable. The covering can again be cut circumferentially at the end of the longitudinal cut in order to remove the covering from the cable.
It will be understood, of course, that modifi-cations can be made in the preferred embodiments described herein without departing from the scope and purview of the invention as defined in the appended claims.
Claims (9)
1. A tool for stripping the covering from a wire-containing cable comprising a shank having a cutting edge for severing the covering; a curved hook extending from said shank and having an edge which faces an edge of said shank; and a protuberance disposed at an outer end of said hook for separating said covering from said cable.
2. The tool as claimed in Claim 1 wherein said hook is S-shaped.
3. The tool as claimed in Claim 2 wherein the degree of curvature of said S-shaped hook is relatively small.
4. The tool as claimed in Claim 1 wherein said pro-tuberance is removably secured to said hook and is replace-able by protuberances of different sizes.
5. A tool for stripping the covering from a wire-containing cable comprising a shank having a cutting edge for severing the covering; a hook extending from said shank and having an edge which faces an edge of said shank, said hook being generally S-shaped and having one extent disposed on one side of a plane in which lies said cutting edge and said longitudinal axis, and another extent disposed on the opposite side thereof; and a protuberance disposed at an outer end of said hook for separating said covering from said cable, said protuberance being intersected by said plane.
6. A tool for stripping the covering from a wire-containing cable comprising a shank having a cutting edge for severing the covering; a hook extending from said shank and having an edge which faces an edge of said shank, both said edges being sharpened for severing the covering; and a guide moveably mounted to said shank for adjusting the depth of cut made by said cutting edge in the covering.
7. The tool as claimed in Claim 6 further including a protuberance disposed at an outer end of said hook for separating the covering from the cable.
8. The tool as claimed in Claims 6 or 7 wherein said guide has a limb disposed parallel to said cutting edge and extending generally laterally from said shank, said limb being adjustably moveable in a direction normal to said cutting edge.
9. A tool as claimed in Claims 6 or 7 wherein said guide has a pair of limbs, one of which being disposed parallel to said cutting edge and extending generally laterally from said shank, the other of which being move-ably mounted to said shank in such manner that said one limb is moveable in a direction normal to said cutting edge;
said guide further including means for locking said other limb to said shank whereby the position of said one limb may be selectively fixed with respect to said cutting edge.
said guide further including means for locking said other limb to said shank whereby the position of said one limb may be selectively fixed with respect to said cutting edge.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000423094A CA1200079A (en) | 1983-03-08 | 1983-03-08 | Tool for stripping the covering from a wire- containing cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000423094A CA1200079A (en) | 1983-03-08 | 1983-03-08 | Tool for stripping the covering from a wire- containing cable |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1200079A true CA1200079A (en) | 1986-02-04 |
Family
ID=4124733
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000423094A Expired CA1200079A (en) | 1983-03-08 | 1983-03-08 | Tool for stripping the covering from a wire- containing cable |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1200079A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104037672A (en) * | 2014-04-30 | 2014-09-10 | 国网河南省电力公司焦作供电公司 | 10 kv cable outer semiconductive layer longitudinal cutting knife |
| FR3008556A1 (en) * | 2013-07-09 | 2015-01-16 | Derancourt | TOOL FOR CUTTING SYNTHETIC CLAMPS OF THE TYPE OF THOSE INTENDED TO RECEIVE UNDERGROUND ELECTRICAL CABLES |
| CN106602476A (en) * | 2017-01-10 | 2017-04-26 | 成都聚立汇信科技有限公司 | Electrician knife |
-
1983
- 1983-03-08 CA CA000423094A patent/CA1200079A/en not_active Expired
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR3008556A1 (en) * | 2013-07-09 | 2015-01-16 | Derancourt | TOOL FOR CUTTING SYNTHETIC CLAMPS OF THE TYPE OF THOSE INTENDED TO RECEIVE UNDERGROUND ELECTRICAL CABLES |
| CN104037672A (en) * | 2014-04-30 | 2014-09-10 | 国网河南省电力公司焦作供电公司 | 10 kv cable outer semiconductive layer longitudinal cutting knife |
| CN106602476A (en) * | 2017-01-10 | 2017-04-26 | 成都聚立汇信科技有限公司 | Electrician knife |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |