CA1157244A - Tool for stripping insulating covering - Google Patents
Tool for stripping insulating coveringInfo
- Publication number
- CA1157244A CA1157244A CA000357805A CA357805A CA1157244A CA 1157244 A CA1157244 A CA 1157244A CA 000357805 A CA000357805 A CA 000357805A CA 357805 A CA357805 A CA 357805A CA 1157244 A CA1157244 A CA 1157244A
- Authority
- CA
- Canada
- Prior art keywords
- cutting blade
- handle
- handles
- wire
- stripping
- 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
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- Removal Of Insulation Or Armoring From Wires Or Cables (AREA)
Abstract
TOOL FOR STRIPPING INSULATING COVERING
Abstract of the Disclosure:
There is disclosed a tool for stripping the insulating covering from a covered electrical wire which comprises one handle pivoted by means of a shaft to the other handle having a lower jaw at the leading end portion thereof and in which the leading portion of the main body of the tool has an electrical wire holding mechanism adapted to grip the wire upon closing of the two handles and cutting blades adapted to cut into and pull the cut insulator covering off of the core of the wire in the longitudinal direction of the handles upon the closing of the handles. The electrical wire holding mechanism and cutting blades project laterally of the handles.
Abstract of the Disclosure:
There is disclosed a tool for stripping the insulating covering from a covered electrical wire which comprises one handle pivoted by means of a shaft to the other handle having a lower jaw at the leading end portion thereof and in which the leading portion of the main body of the tool has an electrical wire holding mechanism adapted to grip the wire upon closing of the two handles and cutting blades adapted to cut into and pull the cut insulator covering off of the core of the wire in the longitudinal direction of the handles upon the closing of the handles. The electrical wire holding mechanism and cutting blades project laterally of the handles.
Description
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1 This invention relates to a tool. for stripping the insulator COVerinCJ formecl of an insulative materi.al such as rubber or vinyl chloride from a covered electr.ical wire.
The conven-tional tool of this typc- used for stripping insulating coating from covered electrical wires comprises an electrical wire holding mechanism consisting of upper and lower jaws at the leading ends o a pair of handles pivotecl to each other for opening and closing and a pair of upper and lower cutting blades movable to cut into the insulator coating on the wire and then strip the cut insulator coating from the wire core. Such type of insulator coating stripping tools are disclosed in U.S. Patent Nos. 3,125,908 and 3,146,645, for example. However, the tools as disclosed in the above-mentioned U.S. patents have the disadvantage that since the upper and lower jaws and the upper and lower cutting blades are positioned in substantially the same plane as the handles lie, the leading end of the wire gripped by the two jaws and nipped by the two cutting blades is interrupted by the handles and therefore, the length o a covered electrical wire from which the insulator coating is to be removed is limited and the insulator coating covering the covered electrical wire can not be stripped off for a substantial distance along the length of the core wire.
And the prior art tools also have the disadvantage that when the insulator coating is stripped off the covered electrical wire, *he wire gripped between the upper and lower ,~ ,' ~.
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1 jaws is frequentl~ displ~ced in~dverten-tly and the cutting posi~i.on on -the insulator coa-ting varies resul-ting in improper stripping of the insulator co~ting. Furthermore, the prior ar-t tools have the disac~vantage that since such tools include a mechanism adapted to move the two cutting blades in the axial direction of the wire and th~ upper and lower jaws are formed as parts separate from the handles, the con-struction is complicated and not compact and does not have sufficient rigidi.ty. Furthermore, since the prior art tools are designed for use with only a covered solid wire, the tools can not strip the sheath from a flattened covered electr.ical wire including a plurality of covered core wires.
Therefore, one object of the present invention is to provide a tool for stripping the insulator coating from a covered electrical wire in which the insulator coating stripping operation is not interrupted by the handles whereby the insulator coating can be stripped from the core wire for a substantial distance along the length of the core wire.
Another object of the present invention is to pro-vide a tool for stripping the insulator coating from a covered electrical wire in which when the insulator coating is to be stripped from the covered electrical wire, the tool is positively prevented from slipping from the cutting .
position on the insulator coating to thereby ensure cutting-off the proper length of insulator coating, Another object of the present invention is to provide a tool for stripping the insulator coating from a ~ 1~724~
1 covered electrlcal wire whi~h has a simp~e and compact but rigid mechani~m.
Anothe~ object of the presen-t inven-t:ion i,5 to provide a tool -for s-trippi.ng the insulator coating from a covered electrical wire which can be simply operated.
Another object of the present invention is to pro-vide a tool Eor stripping the insulator coating from a covered electrical wire which is easily adaptable for stripping a covered electrical wire of the insulator coating and also for stxipping the sheath from a flattened covered electrical wire including a plurality of covered wire cores.
According to the present invention, a tool is pro-vided for stripping the insulator covering from a covered electrical wire in which the main body of the tool comprises a first handle having a lower jaw at the leading end and a second handle pivoted to the first.handle by means of a shaft and a wire holding mechanism:adapted to.grip the wire upon closing of the t~Jo handles and cutting blades adapted to cut into the insulator coverlng on the covered electrical wire and pull the cut insulator covering off of the core wire along the length of the handles upon the closing of the handles are pxovided at the leading end portion of the main body projecting laterally of the handles.
The above and other objects and attendant advantages of.the present invention will be more readily apparent to those skilled in the art from a reading of the following detailed description in conjunction with the accompanying drawings which show one preferred embodiment of the invention ~`' .
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1 for illustration purpose only, but not for :Limiting the scope of -the same in ~ny way.
E'ic~. 1 is a side elevational view of one embodiment of the invention showiny the kool for stripping the insulating covering from a covered electrical wire with a portion thereof broken away;
Fig. 2 is similar to Fig. 1, but shows the upper cutting blade and the associa-ted stripping blade in their lowered position;
Fig. 3 is similar to Fig. 2, but shows the associated stripping blade in its stripping position;
Fig. 4 is an end elevational view of the tool in its condition as shown in Fig. 3; and Fig. 5 is a perspective view of the tool as shown in Fig. 1 with a portion thereof broken away.
The present invention will be now described by way of the accompanying drawings which show the preferred - embodiment of the tool.
In Figs. 1 and 5, reference numeral 1 denotes an upper handle of U-shaped cross-section having a lower jaw 2 integral with the leading end of the handle and the lower jaw has at the leading or free end thereof a lower holding portion 3 extending from the forward end of the lower jaw 2 and also projecting laterally of one surface 1' of the upper handle 1 and one surface 9' of a lower handle 9 of U-shaped cross-section. The upper surface 3' of the holding portion 3 is provided with a groove 6 in which the roots of a lower cutting blade 4 and a plurality of guides 5 are held in ~y~ ~, I ~ ~724~
l position. Thus, -the lower cut-ting b:la~e ~ and guide 5 are also positioned for projecti.ng later~ of the sur:Eaces l' and 9' of -the upper and lower handles l and 9, respec-tively.
A portion of the lower cutting b:Lade ~ on one s;.~e thereof is provided with one or more arcuate blade edyes 7 (each b].~de edge 7 is adapted to cu-t into the insulating covering on a covered solid wire) and another portion of the lower cutting blade on the other or opposite side thereof is provided with a blade edge 8 in the forrn of an elongated recess having the depth greater than tha-t of the arcuate blade edges 7. The blade edge 8 has a flattened bottom and - is adapted to cut into the insulating covering of a flattened covered electrical wire such as a flattened vinyl sheathed cable. The guides 5 are secured to one or the outer end of the outermost arcuate blade edge 7, one or the outer end of the blade edge 8 and the boundar~ between one or the outer end of the innermost arcuate blade edge 7 and the other or inner end of the blade edge 8, respectively, in the illustrated embodiment. The leading end of the lo~7er handle.9 is pivoted by means of.a stub shaft lO to the intermediate position of the upper handle l where the rear end of the lower jaw 2.is positioned. Disposed about the stub shaft lO is a return spring 13 having one end abutting against a groove ll formed in the middle portion of the upper handle l and the other end abutting against the inner surface of the U-shaped lower handle 9. Reference numeral 14 denotes an elongated guide opening formed in substantially the central portion of the length of the upper handle 1 and ~ ~5724~
1 a gu:ide member 15 is received in the guide opening ].~ and is pi.voted in suhs-t:ant:ially the central portion thercof to the upper handl~ 1 by means of a transverse holt 16. Pxovided at -the leading end oE the yuid~ member 15 i~ an upper holding portion 17 which projects laterally o~ the surfaces 1' and 9' of the upper and lower handles 1 and 9, respectively like the lower holding portion 3. The upper holding portion 17 is adapted to move toward the lower holding por-tion 3 as.
the lower handle 9 is pivoted in the di.rection toward the upper handle 1 as will be described hereinaf-ter. The under-surface 17' of the upper holding portion 17 faces the upper surface 3' of the lower holding portion 3 and thus the surfaces 17' and 13' of the upper and lower holding portions 17 and 13 provide an electrical wire holding mechanism which clamps the wire as the lower handle 9 approaches the upper handle 1. A stop member 18 is integrally formed on one side of the upper holding portion 17 and projects downwardly a smail distance from the undersurface 17' of the holding portion 17 ~Figs. 1 and 4). The stop member 18 functions to limit the pivotal movement of the guide member 15 as the guide member pivots about the axis of the bolt 16 in the counter-clockwise direction as seen in Figs. 1 to 3 inclusive by means of an interlocking rod 21, the descriptlon of which will be given hereinafter, when the upper and lower handles 1 and 9 are closed and when the guide member has pivoted by a predetermined angular distance in the counter-clockwise direction, the lower end of the stop member 18 abuts against the upper surface 3' of the lower holding portion 3 to . . . " .
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1 prevent the guide member 15 from Eurther pivotiny. The undersurface 17' of the upper holding por-tion 17 is provided with recesses 19 for receiving the upper ends oE the guides 5 during the insulating coveriny stripping operati.on. An anti-slip member 38 is securely provided on the holding portion along the front surface of an upper cutting blade 30 the description of which will be given hereinafter. The anti-slip member 38 has a pointed leading edge which is adapted to abut against the cut end edge of the insulating covering remaining on the electrical wire when, after the cooperating lower and upper blades ~ and 30 cut into the in-sulating covering, the upper bla~e 30 is moved so as to remove.the coating from the wire. Instead of providing such the anti-slip member 38 on the holding portion 17, serrations can be provided on the undersurface 17' of the upper holding portion 17 and on the upper surface 3' of the lower holding portion 3 for preventing the electrical wire from slipping off. ~.
The rear portion of the above~mentioned guide member 15 is provided with a slot 20. Reference numeral 21 denotes a connector rod which is pivoted at the lower end to the lower handle 9 in substantially the central portion of the latter by means of a stub shaft 22 and is also pivotably supported on a pin 23 loosely received in .25 the slot 20 in the guide member 15. .By the provision of the connector rod 21 in the manner described above, the guide member 15 is pivotably connected to the lower handle 9 by the connector rod 21. Disposed a~out the p.in 22 is a spring ~ 1 S72~
1 24 whi.ch has one end ahllttiny ayainst the inner surface of the lower handle 9 and the other end abu~ting against the connector rod 21 whereby a resilien-t force acts on -the rod 21 in the counter-clockwise direction as seen in Figs. 1 to 3 inclusive.
~ hen the gripping force applied to the upper and lower handles 1 and 9 is removed therefrom, the above-mentione spr.ing 24 and also spring 13 recoil to cause the lower handle 9 to pivot about the pin 10 in the clockwise direction as seen in Figs, 1 to 3 inclusive which in turn causes the connector rod 21 to pivot about the pin 22 in the counter-clockwlse direction to thereby move the pin 23 of the upper end of the rod leftwards within the slot 20. Referenc~
numeral 26 denotes an upper cutting blade holder having an upper cutting blade support portion 27 for holding the upper cutting blade 30 at the leading end and received in the guide opening 14 in parallel with the guide memher 15.
The upper cutting blade holder 26 has an elongated slot 28 in substantially the central portion thereof for loosely receiving the above-mentioned bolt 16 and also a through bore- 29 in the rear portion for pivotably receiving the above-mentioned pin 23. Thus, the upper cutting blade holder 26 is also pivotably connected to the upper handle 1 and further pivotably connected at the rear end to the lower handle 9.by means of the connector rod 21. The upper cutting blade support portion 27 is positioned behind the holding portion 17 and projects laterally o~ the surfaces 1' and 9' of the upper and lower handles.l and 9 in the same direction .
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~6 s , 1 157~4 1 as the holding portioll 17. 'rhe front sur.Eace 27' of the blade support portion 27 has the upper cutting blade 30 secured thereto in oppos:ition to -the lower cutting blade 4 and -the upper blade 30 secured there-to ln opposition to the lower cutting blade 4 and the upper blade 30 cuts into the insulating covering on the electrical wire together with the lower cutting blade 4. Like the lower cutting blade 4, the upper cutting blade 30 projects laterally of the surfaces 1' and 9' of the upper and lower handles 1 and 9. ~ portion of the cutting blade 30 on one side thereof is provided with a plurality of arcuate blade edges 31 which correspond in number to and are aligned with the blade edges 7 on the lower cutting blade 4. Thus, the edges 31 are complementary to the cutting edges 7. Another portion of the cutting blade 30 on the other or opposite side thereof is provided with an elongated blade edge 32 which is complementary to and in alignment with the edge 8 on the lower cutting blade 4.
Reference numeral 33 denotes an insulating covering stripping member which is adapted to abut against the end surface of the insulating covering on the electrical wire where the lower cutting blade 4 has cut and move together with the upper cutting blade 30 in parallel to the longitudinal direction of the upper and lower handles 1 and 9 to thereby aid the stripping of the insulating covering. ~he stripping member 33 has a stripping portion 34 at the leading end and a slot 35 in the rear portion and is positioned between the guide member 15 and the upper cutting blade holder 26 within the guide opening 14. Like the upper cutting blade holder 26, ~ 9 _ 1 ~572~
1 the strippin~ Inern~er 33 is a:Lso provi.ded in substclnti.ally the central portion thereof witll a slot 36. The bolt 16 extends loosely through the sl.ot 36 to pivotably connect -the member 33 to the ~Ipper handle 1 and thc pin 23 extends loosely through the rear slot 35 to pivotably connect the member 33 to the central portion of the lower handle 9 through the connector rod 21. And as more clearly shown in Fig. 5, the ~tripping member 33 projects laterally of the surfaces 1' and 9' of the upper and lower handles 1 and 9 behind the lower cutting blade 4 in the same direction as the lower holding portion 3. In the initial stage of the stripping operation, the leading end of the stripping portion 34 of the stripping member 33 is in engagement with the inner side of the lower cutting blade 4. If necessary or desired, a stripping blade 37 may be attached to the stripping portion 34 projecting laterally of the surfaces 1' and 9' of the upper and lower handles 1 and 9 like the lower cutting blade 4.
The blade edge of the stripping blade 37 extends parallel to the lower cutting blade 4 and.has a configuration corresponding to the blade edges 7 and 8 so as to cut into the insulating covering of the electrical wire in cooperation with the blade edges 7.and 8.
With the above-described construction and arrangement of the components of the tool, in operation, a covered electrical wire from which the sheath or covering is to be removed such as a flattened.covered electrical wire is passed into the space between the guides 5 from the front thexeof ox from one side of the guides with the axis of the 1 wire ex-tendincJ in the longi~udi,nal direction oE -the handles 1 and ~ in the position of -the tool as shown in Fig. 1 wherein the lower hand]e 9 is its fully open position. As the covered wire is passed between -the yuides 5, a par-ti-cular or predetermined area of the wire is posi-tioned on the blade edge 8 of the lower cutting blade 4. Then, the operator grips the upper and lower handles 1 and 9 to pivot the lower handle 9 about the pin 10 in the counter-cloc]cwise direction (as seen in Fig. 1) against the force of the lC spring 13. The pivotal movement of the lower handle 9 in the counter-clockwise direction raises the connector rod 21 pivoted to the lower handle 9 by the counter-clockwise spring force of the spring 24 and the rising connec-tor rod 21 pushes upwardly the rear portion of the guide member 15 by means of the pin 23 at the upper end of the rod 21. Thus, the guide member 15 pivots about the bolt 16 in the counter-clockwise direction as seen in Fig. 1 and the upper holding portion 17 moves downwardly toward the lower holding portion 3 on the upper handle 1 to grip the covered wire between the ~nti-slip member 38 on the undersurface of the upper holding porti,on 17 and the lower holding portion 3.
Simultaneously with the upward movement of the connector rod 21, the rear portion of the upper cutting blade holder 26 is also pushed up by the pin 23 to pivot about the bolt 16 in the counter-clockwise direction as seen in Fig. 1 to thereby move the upper cutting,blade 30 supported by the upper blade.-support poxtion 27 downwardly toward the lower cutting blade 4 on the lower holding portion 3. On the 1 15~24~
1 othe~ hand, since t}-le slot 35 in th~ rear portion of the stripping member 33 extends in the same direction as the pin 23 moves upwardly ancl thus, since the pin 23 moves upwardly along the slot 35, no pivotal movement o:E -the stripping member 33 will occur whereby the stripping portion 34 is held in con-tact wi~h the lower holding portion 3 with the stripping blade 37 disposed adjacent to the lower cutting blade 4. When the lower handle 9 is moved upwardly in the manner described above, the upper blade 30 is caused to be pressed against the flattened covered wire positioned on the lower cutting blade 4, the upper ends of the guides 5 enter the corresponding recesses 19 in the undersurface 17' of the holding portion 17, the blade edges 8 and 32 of the lower and upper cutting blades 4 and 30, respectively, cut into the insulating covering on the covered electrical wire and at the same time, the anti-slip member 38 provided on the undersurface o~ the upper holding portion 17 along the forward sur~ace of the upper blade 30 and the stripping blade 37 positioned adjacent to the inner side o~ the lower cutting blade 4 also cut into the insulating covering.
When a cut has been made in the insulating covering to a predetermined depth, the lower end o~ the stop member 18 on the guide member 15 caused to abut against the upper surface 3' o~ the lower holding portion 3 on the upper handle 1 as shown in Fig. 2 to terminate the pivotal movement of the guide member 15 and the upper cutting b].ade holder 26.
In this condition of the tool, the slot 20 in the guide member 15, the slot 28 in the upper cutting blade holder 26 .
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1 and the slot 36 in the stripping member 33 are disposed in parallel to each other in the longitudinal direction of the upper handle 1. Therea~ter, as the lower handle 9 is further pivoted upwardly, the lower end of -the connector rod 21 is also moved upwardly, because -the lower end of the rod is pivoted to the lower handle 9 by the stub shaft 22.
However, since the upper end of the connector rod 21 is connected to the guide member 15 which is now stationary by means of the pin 23 engaging in the guide member slot 20, the pin 23 moves rightwards as seen in Figs. 1 to 3 inclusive along the slot 20 as the connector rod 21 moves upwardly.
Thus, the connector rod 21 pivots about -the stub shaft 22 in the clockwise direction as seen in Figs. 1 to 3 inclusive against the force of the spring 24. The rightward movement of the pin 23 along the slot 20 causes the upper cutting blade holaer 26 pivoted in the rear portion to the pin 23 to move rightwards as seen in Figs. 1 to 3 inclusive under the guidance of the bolt 16 loosely received in the slot 28 formed in the central portion of the holder 26 and at the same time, the stripping member 33 having the pin 23 received loosely in the slot 35 also moves rightwards as seen in Figs. 1 to 3 inclusive under the guidance oE the bolt 16 received loosely in the slot 36 in the central portion o~
the member 33 together with the upper cutting blade holder 26 parallel to the latter. This movement of the members 26 33 causes the upper cutting blade 30 and stripping blade 37 which have cut into the insulating covering on the covered electrical wire to move simultaneously and parallel to each 1 ~ 572~L
1 other in the axial direction of the ~lattened covered elec-trical wire which e~ten~s in the lonyitudinal direction of the upper and lower handles 1 and 9 -to assume the position as shown in Fig. 3. At this time, since the covered electrical wire is gripped by the wire holding mechanism comprised o~ the holding portions 3 and 17 and ~urther since the cut end edge formed on the insulator coating thereof is restrained by the anti-slip member 38 and the lower blade 4, as the upper cutting blade 30 and stripping blade 37 move so as to pull the cut insulating covering off of the wire core toward the rear portions of the handles, the displacement of.the cut end is prevented and the covered electrical wire can be positively stripped of the insulating covering from the cut end edge. Thereafter, when the gripping fbrce applied to the handles 1 and ~ is released the above-described sequence of operations is reversed, that is, first of all, the lower.handle 9 is caused to plvot downwardly in the clockwise direction as seen in Figs. 1 to 3 inclusive under the force of the springs 13 and 24 and the connector rod 21 is also caused to pivot downwardly in the counter-clockwise direction as.seen in Figs. 1 to 3 inclusive under the force of the spring 24 whereby the upper cutting blade holder 26 holding the upper cutting blade 3~ thereon and the stripping blade holder 33 holding the stripping blade 37 thereon simultaneously move leftwards as seen in Figs. 1 to 3 inclusive in parallel to each other to the position as - shown in Fig.2. As the lower handle 9 further continues to pivot:.downwardly, the connector rod 21 also pivots downwardlyt ~ 1~72~
1 and the guide member 15 and upper cu-tting blade holder 26 pivot downwardly in the clockwise direc-tion to the position as shown in Fig. 1 whereby the flattened covered elec-trical wire from which the insulating covering has been removed is released to thereby complete the stripping operation. When a covered solid wire is subjected to the stripping treatment, the wire is positioned on the arcuate blade edge 7 of the lower cutting blade 4 in the same manner as described in connection with the insulator coating stripping treatment on the flattened covered electrical wire and the lower handle 9 is gripped to be pivoted upwardly toward the upper handle 1, the blade edge 7 of the lower cutting blade 4, the blade edge 31 of the upper cutting blade 30 and the stripping blade 37 cut into the insulating covering on the covered solid wire to a predetermined depth and the upper blade 30 and stripping blade 37 move.along the core wire whereby the insulator.
coating is pulled off the core wire.
As is clear.from the foregoing, according to the present invention, by placing a covered electrical wire from which the insulating covering is to be removed onto the holding portion of the lower ~aw and then gripping the lower handle to cause the handle to:pivot-upwardly, the insulating covering stripping. operation is performed in the axial direction of the wire and thus, the stripping can be efficiently performed even in a limited space. And since the upper and lower cutting blades project laterally of the side surfaces of the upper and lower handles, the electrical wire positioned between the upper and lower cutting blades : ;`
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1 will not impede the movemen-t of the handles, -the lower cuttin~ blade can be positioned in any desired position along the wire to thereby ensure positive stripping o~ the insulator coating coveriny a substan-tial distance in the longitudinal direction of the wire. Furthermore, during the stripping of the insulator coating, since the anti-slip member and lower cutting blade abut against the cut edge on the insulator coating, the wire is held against movement and displacemen-t to thereby ensure positive cut off of the insulating covering from a precise position thereon. And since the lower cutting blade is secured to-the lower jaw which is integral with the leading end of one of the handles and does not move during the stripping operation, the construction o~ the tool can be made simple and rigid.
Furthermore, since the guide member, upper cutting blade holding portion and stripping member are mounted on the handle by the common shaft and operated by the common connector rod, the operation mechanism of the tool is simple and compact and can be operated in a simple manner. Further-more, since the complementary arcuate blade edges are providedon the opposing upper and lower cutting blades in adjacent opposing upper and lower cutting blades in adjacent opposing relationship for stripping a flattened covered electrical wire of the insulator coating, the insulating covering can be-stripped off of a flattened covered electrical wire com-prisirg a plurality of covered wires as well as a covered solid wire.
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1 While only one embodiment of the inven-tion has been shown and described in detail, it will be understood that the same is for illustration only and not to be taken ~s a defi~.
nition of the invention, reference being had for this purpose to the appended claims.
. - 17 -.
1 This invention relates to a tool. for stripping the insulator COVerinCJ formecl of an insulative materi.al such as rubber or vinyl chloride from a covered electr.ical wire.
The conven-tional tool of this typc- used for stripping insulating coating from covered electrical wires comprises an electrical wire holding mechanism consisting of upper and lower jaws at the leading ends o a pair of handles pivotecl to each other for opening and closing and a pair of upper and lower cutting blades movable to cut into the insulator coating on the wire and then strip the cut insulator coating from the wire core. Such type of insulator coating stripping tools are disclosed in U.S. Patent Nos. 3,125,908 and 3,146,645, for example. However, the tools as disclosed in the above-mentioned U.S. patents have the disadvantage that since the upper and lower jaws and the upper and lower cutting blades are positioned in substantially the same plane as the handles lie, the leading end of the wire gripped by the two jaws and nipped by the two cutting blades is interrupted by the handles and therefore, the length o a covered electrical wire from which the insulator coating is to be removed is limited and the insulator coating covering the covered electrical wire can not be stripped off for a substantial distance along the length of the core wire.
And the prior art tools also have the disadvantage that when the insulator coating is stripped off the covered electrical wire, *he wire gripped between the upper and lower ,~ ,' ~.
~ 15~4~
1 jaws is frequentl~ displ~ced in~dverten-tly and the cutting posi~i.on on -the insulator coa-ting varies resul-ting in improper stripping of the insulator co~ting. Furthermore, the prior ar-t tools have the disac~vantage that since such tools include a mechanism adapted to move the two cutting blades in the axial direction of the wire and th~ upper and lower jaws are formed as parts separate from the handles, the con-struction is complicated and not compact and does not have sufficient rigidi.ty. Furthermore, since the prior art tools are designed for use with only a covered solid wire, the tools can not strip the sheath from a flattened covered electr.ical wire including a plurality of covered core wires.
Therefore, one object of the present invention is to provide a tool for stripping the insulator coating from a covered electrical wire in which the insulator coating stripping operation is not interrupted by the handles whereby the insulator coating can be stripped from the core wire for a substantial distance along the length of the core wire.
Another object of the present invention is to pro-vide a tool for stripping the insulator coating from a covered electrical wire in which when the insulator coating is to be stripped from the covered electrical wire, the tool is positively prevented from slipping from the cutting .
position on the insulator coating to thereby ensure cutting-off the proper length of insulator coating, Another object of the present invention is to provide a tool for stripping the insulator coating from a ~ 1~724~
1 covered electrlcal wire whi~h has a simp~e and compact but rigid mechani~m.
Anothe~ object of the presen-t inven-t:ion i,5 to provide a tool -for s-trippi.ng the insulator coating from a covered electrical wire which can be simply operated.
Another object of the present invention is to pro-vide a tool Eor stripping the insulator coating from a covered electrical wire which is easily adaptable for stripping a covered electrical wire of the insulator coating and also for stxipping the sheath from a flattened covered electrical wire including a plurality of covered wire cores.
According to the present invention, a tool is pro-vided for stripping the insulator covering from a covered electrical wire in which the main body of the tool comprises a first handle having a lower jaw at the leading end and a second handle pivoted to the first.handle by means of a shaft and a wire holding mechanism:adapted to.grip the wire upon closing of the t~Jo handles and cutting blades adapted to cut into the insulator coverlng on the covered electrical wire and pull the cut insulator covering off of the core wire along the length of the handles upon the closing of the handles are pxovided at the leading end portion of the main body projecting laterally of the handles.
The above and other objects and attendant advantages of.the present invention will be more readily apparent to those skilled in the art from a reading of the following detailed description in conjunction with the accompanying drawings which show one preferred embodiment of the invention ~`' .
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1 1572~
1 for illustration purpose only, but not for :Limiting the scope of -the same in ~ny way.
E'ic~. 1 is a side elevational view of one embodiment of the invention showiny the kool for stripping the insulating covering from a covered electrical wire with a portion thereof broken away;
Fig. 2 is similar to Fig. 1, but shows the upper cutting blade and the associa-ted stripping blade in their lowered position;
Fig. 3 is similar to Fig. 2, but shows the associated stripping blade in its stripping position;
Fig. 4 is an end elevational view of the tool in its condition as shown in Fig. 3; and Fig. 5 is a perspective view of the tool as shown in Fig. 1 with a portion thereof broken away.
The present invention will be now described by way of the accompanying drawings which show the preferred - embodiment of the tool.
In Figs. 1 and 5, reference numeral 1 denotes an upper handle of U-shaped cross-section having a lower jaw 2 integral with the leading end of the handle and the lower jaw has at the leading or free end thereof a lower holding portion 3 extending from the forward end of the lower jaw 2 and also projecting laterally of one surface 1' of the upper handle 1 and one surface 9' of a lower handle 9 of U-shaped cross-section. The upper surface 3' of the holding portion 3 is provided with a groove 6 in which the roots of a lower cutting blade 4 and a plurality of guides 5 are held in ~y~ ~, I ~ ~724~
l position. Thus, -the lower cut-ting b:la~e ~ and guide 5 are also positioned for projecti.ng later~ of the sur:Eaces l' and 9' of -the upper and lower handles l and 9, respec-tively.
A portion of the lower cutting b:Lade ~ on one s;.~e thereof is provided with one or more arcuate blade edyes 7 (each b].~de edge 7 is adapted to cu-t into the insulating covering on a covered solid wire) and another portion of the lower cutting blade on the other or opposite side thereof is provided with a blade edge 8 in the forrn of an elongated recess having the depth greater than tha-t of the arcuate blade edges 7. The blade edge 8 has a flattened bottom and - is adapted to cut into the insulating covering of a flattened covered electrical wire such as a flattened vinyl sheathed cable. The guides 5 are secured to one or the outer end of the outermost arcuate blade edge 7, one or the outer end of the blade edge 8 and the boundar~ between one or the outer end of the innermost arcuate blade edge 7 and the other or inner end of the blade edge 8, respectively, in the illustrated embodiment. The leading end of the lo~7er handle.9 is pivoted by means of.a stub shaft lO to the intermediate position of the upper handle l where the rear end of the lower jaw 2.is positioned. Disposed about the stub shaft lO is a return spring 13 having one end abutting against a groove ll formed in the middle portion of the upper handle l and the other end abutting against the inner surface of the U-shaped lower handle 9. Reference numeral 14 denotes an elongated guide opening formed in substantially the central portion of the length of the upper handle 1 and ~ ~5724~
1 a gu:ide member 15 is received in the guide opening ].~ and is pi.voted in suhs-t:ant:ially the central portion thercof to the upper handl~ 1 by means of a transverse holt 16. Pxovided at -the leading end oE the yuid~ member 15 i~ an upper holding portion 17 which projects laterally o~ the surfaces 1' and 9' of the upper and lower handles 1 and 9, respectively like the lower holding portion 3. The upper holding portion 17 is adapted to move toward the lower holding por-tion 3 as.
the lower handle 9 is pivoted in the di.rection toward the upper handle 1 as will be described hereinaf-ter. The under-surface 17' of the upper holding portion 17 faces the upper surface 3' of the lower holding portion 3 and thus the surfaces 17' and 13' of the upper and lower holding portions 17 and 13 provide an electrical wire holding mechanism which clamps the wire as the lower handle 9 approaches the upper handle 1. A stop member 18 is integrally formed on one side of the upper holding portion 17 and projects downwardly a smail distance from the undersurface 17' of the holding portion 17 ~Figs. 1 and 4). The stop member 18 functions to limit the pivotal movement of the guide member 15 as the guide member pivots about the axis of the bolt 16 in the counter-clockwise direction as seen in Figs. 1 to 3 inclusive by means of an interlocking rod 21, the descriptlon of which will be given hereinafter, when the upper and lower handles 1 and 9 are closed and when the guide member has pivoted by a predetermined angular distance in the counter-clockwise direction, the lower end of the stop member 18 abuts against the upper surface 3' of the lower holding portion 3 to . . . " .
~ ~ 572~
1 prevent the guide member 15 from Eurther pivotiny. The undersurface 17' of the upper holding por-tion 17 is provided with recesses 19 for receiving the upper ends oE the guides 5 during the insulating coveriny stripping operati.on. An anti-slip member 38 is securely provided on the holding portion along the front surface of an upper cutting blade 30 the description of which will be given hereinafter. The anti-slip member 38 has a pointed leading edge which is adapted to abut against the cut end edge of the insulating covering remaining on the electrical wire when, after the cooperating lower and upper blades ~ and 30 cut into the in-sulating covering, the upper bla~e 30 is moved so as to remove.the coating from the wire. Instead of providing such the anti-slip member 38 on the holding portion 17, serrations can be provided on the undersurface 17' of the upper holding portion 17 and on the upper surface 3' of the lower holding portion 3 for preventing the electrical wire from slipping off. ~.
The rear portion of the above~mentioned guide member 15 is provided with a slot 20. Reference numeral 21 denotes a connector rod which is pivoted at the lower end to the lower handle 9 in substantially the central portion of the latter by means of a stub shaft 22 and is also pivotably supported on a pin 23 loosely received in .25 the slot 20 in the guide member 15. .By the provision of the connector rod 21 in the manner described above, the guide member 15 is pivotably connected to the lower handle 9 by the connector rod 21. Disposed a~out the p.in 22 is a spring ~ 1 S72~
1 24 whi.ch has one end ahllttiny ayainst the inner surface of the lower handle 9 and the other end abu~ting against the connector rod 21 whereby a resilien-t force acts on -the rod 21 in the counter-clockwise direction as seen in Figs. 1 to 3 inclusive.
~ hen the gripping force applied to the upper and lower handles 1 and 9 is removed therefrom, the above-mentione spr.ing 24 and also spring 13 recoil to cause the lower handle 9 to pivot about the pin 10 in the clockwise direction as seen in Figs, 1 to 3 inclusive which in turn causes the connector rod 21 to pivot about the pin 22 in the counter-clockwlse direction to thereby move the pin 23 of the upper end of the rod leftwards within the slot 20. Referenc~
numeral 26 denotes an upper cutting blade holder having an upper cutting blade support portion 27 for holding the upper cutting blade 30 at the leading end and received in the guide opening 14 in parallel with the guide memher 15.
The upper cutting blade holder 26 has an elongated slot 28 in substantially the central portion thereof for loosely receiving the above-mentioned bolt 16 and also a through bore- 29 in the rear portion for pivotably receiving the above-mentioned pin 23. Thus, the upper cutting blade holder 26 is also pivotably connected to the upper handle 1 and further pivotably connected at the rear end to the lower handle 9.by means of the connector rod 21. The upper cutting blade support portion 27 is positioned behind the holding portion 17 and projects laterally o~ the surfaces 1' and 9' of the upper and lower handles.l and 9 in the same direction .
~\ .
~6 s , 1 157~4 1 as the holding portioll 17. 'rhe front sur.Eace 27' of the blade support portion 27 has the upper cutting blade 30 secured thereto in oppos:ition to -the lower cutting blade 4 and -the upper blade 30 secured there-to ln opposition to the lower cutting blade 4 and the upper blade 30 cuts into the insulating covering on the electrical wire together with the lower cutting blade 4. Like the lower cutting blade 4, the upper cutting blade 30 projects laterally of the surfaces 1' and 9' of the upper and lower handles 1 and 9. ~ portion of the cutting blade 30 on one side thereof is provided with a plurality of arcuate blade edges 31 which correspond in number to and are aligned with the blade edges 7 on the lower cutting blade 4. Thus, the edges 31 are complementary to the cutting edges 7. Another portion of the cutting blade 30 on the other or opposite side thereof is provided with an elongated blade edge 32 which is complementary to and in alignment with the edge 8 on the lower cutting blade 4.
Reference numeral 33 denotes an insulating covering stripping member which is adapted to abut against the end surface of the insulating covering on the electrical wire where the lower cutting blade 4 has cut and move together with the upper cutting blade 30 in parallel to the longitudinal direction of the upper and lower handles 1 and 9 to thereby aid the stripping of the insulating covering. ~he stripping member 33 has a stripping portion 34 at the leading end and a slot 35 in the rear portion and is positioned between the guide member 15 and the upper cutting blade holder 26 within the guide opening 14. Like the upper cutting blade holder 26, ~ 9 _ 1 ~572~
1 the strippin~ Inern~er 33 is a:Lso provi.ded in substclnti.ally the central portion thereof witll a slot 36. The bolt 16 extends loosely through the sl.ot 36 to pivotably connect -the member 33 to the ~Ipper handle 1 and thc pin 23 extends loosely through the rear slot 35 to pivotably connect the member 33 to the central portion of the lower handle 9 through the connector rod 21. And as more clearly shown in Fig. 5, the ~tripping member 33 projects laterally of the surfaces 1' and 9' of the upper and lower handles 1 and 9 behind the lower cutting blade 4 in the same direction as the lower holding portion 3. In the initial stage of the stripping operation, the leading end of the stripping portion 34 of the stripping member 33 is in engagement with the inner side of the lower cutting blade 4. If necessary or desired, a stripping blade 37 may be attached to the stripping portion 34 projecting laterally of the surfaces 1' and 9' of the upper and lower handles 1 and 9 like the lower cutting blade 4.
The blade edge of the stripping blade 37 extends parallel to the lower cutting blade 4 and.has a configuration corresponding to the blade edges 7 and 8 so as to cut into the insulating covering of the electrical wire in cooperation with the blade edges 7.and 8.
With the above-described construction and arrangement of the components of the tool, in operation, a covered electrical wire from which the sheath or covering is to be removed such as a flattened.covered electrical wire is passed into the space between the guides 5 from the front thexeof ox from one side of the guides with the axis of the 1 wire ex-tendincJ in the longi~udi,nal direction oE -the handles 1 and ~ in the position of -the tool as shown in Fig. 1 wherein the lower hand]e 9 is its fully open position. As the covered wire is passed between -the yuides 5, a par-ti-cular or predetermined area of the wire is posi-tioned on the blade edge 8 of the lower cutting blade 4. Then, the operator grips the upper and lower handles 1 and 9 to pivot the lower handle 9 about the pin 10 in the counter-cloc]cwise direction (as seen in Fig. 1) against the force of the lC spring 13. The pivotal movement of the lower handle 9 in the counter-clockwise direction raises the connector rod 21 pivoted to the lower handle 9 by the counter-clockwise spring force of the spring 24 and the rising connec-tor rod 21 pushes upwardly the rear portion of the guide member 15 by means of the pin 23 at the upper end of the rod 21. Thus, the guide member 15 pivots about the bolt 16 in the counter-clockwise direction as seen in Fig. 1 and the upper holding portion 17 moves downwardly toward the lower holding portion 3 on the upper handle 1 to grip the covered wire between the ~nti-slip member 38 on the undersurface of the upper holding porti,on 17 and the lower holding portion 3.
Simultaneously with the upward movement of the connector rod 21, the rear portion of the upper cutting blade holder 26 is also pushed up by the pin 23 to pivot about the bolt 16 in the counter-clockwise direction as seen in Fig. 1 to thereby move the upper cutting,blade 30 supported by the upper blade.-support poxtion 27 downwardly toward the lower cutting blade 4 on the lower holding portion 3. On the 1 15~24~
1 othe~ hand, since t}-le slot 35 in th~ rear portion of the stripping member 33 extends in the same direction as the pin 23 moves upwardly ancl thus, since the pin 23 moves upwardly along the slot 35, no pivotal movement o:E -the stripping member 33 will occur whereby the stripping portion 34 is held in con-tact wi~h the lower holding portion 3 with the stripping blade 37 disposed adjacent to the lower cutting blade 4. When the lower handle 9 is moved upwardly in the manner described above, the upper blade 30 is caused to be pressed against the flattened covered wire positioned on the lower cutting blade 4, the upper ends of the guides 5 enter the corresponding recesses 19 in the undersurface 17' of the holding portion 17, the blade edges 8 and 32 of the lower and upper cutting blades 4 and 30, respectively, cut into the insulating covering on the covered electrical wire and at the same time, the anti-slip member 38 provided on the undersurface o~ the upper holding portion 17 along the forward sur~ace of the upper blade 30 and the stripping blade 37 positioned adjacent to the inner side o~ the lower cutting blade 4 also cut into the insulating covering.
When a cut has been made in the insulating covering to a predetermined depth, the lower end o~ the stop member 18 on the guide member 15 caused to abut against the upper surface 3' o~ the lower holding portion 3 on the upper handle 1 as shown in Fig. 2 to terminate the pivotal movement of the guide member 15 and the upper cutting b].ade holder 26.
In this condition of the tool, the slot 20 in the guide member 15, the slot 28 in the upper cutting blade holder 26 .
- 12 ~
.
1 ~ 572~ ~
1 and the slot 36 in the stripping member 33 are disposed in parallel to each other in the longitudinal direction of the upper handle 1. Therea~ter, as the lower handle 9 is further pivoted upwardly, the lower end of -the connector rod 21 is also moved upwardly, because -the lower end of the rod is pivoted to the lower handle 9 by the stub shaft 22.
However, since the upper end of the connector rod 21 is connected to the guide member 15 which is now stationary by means of the pin 23 engaging in the guide member slot 20, the pin 23 moves rightwards as seen in Figs. 1 to 3 inclusive along the slot 20 as the connector rod 21 moves upwardly.
Thus, the connector rod 21 pivots about -the stub shaft 22 in the clockwise direction as seen in Figs. 1 to 3 inclusive against the force of the spring 24. The rightward movement of the pin 23 along the slot 20 causes the upper cutting blade holaer 26 pivoted in the rear portion to the pin 23 to move rightwards as seen in Figs. 1 to 3 inclusive under the guidance of the bolt 16 loosely received in the slot 28 formed in the central portion of the holder 26 and at the same time, the stripping member 33 having the pin 23 received loosely in the slot 35 also moves rightwards as seen in Figs. 1 to 3 inclusive under the guidance oE the bolt 16 received loosely in the slot 36 in the central portion o~
the member 33 together with the upper cutting blade holder 26 parallel to the latter. This movement of the members 26 33 causes the upper cutting blade 30 and stripping blade 37 which have cut into the insulating covering on the covered electrical wire to move simultaneously and parallel to each 1 ~ 572~L
1 other in the axial direction of the ~lattened covered elec-trical wire which e~ten~s in the lonyitudinal direction of the upper and lower handles 1 and 9 -to assume the position as shown in Fig. 3. At this time, since the covered electrical wire is gripped by the wire holding mechanism comprised o~ the holding portions 3 and 17 and ~urther since the cut end edge formed on the insulator coating thereof is restrained by the anti-slip member 38 and the lower blade 4, as the upper cutting blade 30 and stripping blade 37 move so as to pull the cut insulating covering off of the wire core toward the rear portions of the handles, the displacement of.the cut end is prevented and the covered electrical wire can be positively stripped of the insulating covering from the cut end edge. Thereafter, when the gripping fbrce applied to the handles 1 and ~ is released the above-described sequence of operations is reversed, that is, first of all, the lower.handle 9 is caused to plvot downwardly in the clockwise direction as seen in Figs. 1 to 3 inclusive under the force of the springs 13 and 24 and the connector rod 21 is also caused to pivot downwardly in the counter-clockwise direction as.seen in Figs. 1 to 3 inclusive under the force of the spring 24 whereby the upper cutting blade holder 26 holding the upper cutting blade 3~ thereon and the stripping blade holder 33 holding the stripping blade 37 thereon simultaneously move leftwards as seen in Figs. 1 to 3 inclusive in parallel to each other to the position as - shown in Fig.2. As the lower handle 9 further continues to pivot:.downwardly, the connector rod 21 also pivots downwardlyt ~ 1~72~
1 and the guide member 15 and upper cu-tting blade holder 26 pivot downwardly in the clockwise direc-tion to the position as shown in Fig. 1 whereby the flattened covered elec-trical wire from which the insulating covering has been removed is released to thereby complete the stripping operation. When a covered solid wire is subjected to the stripping treatment, the wire is positioned on the arcuate blade edge 7 of the lower cutting blade 4 in the same manner as described in connection with the insulator coating stripping treatment on the flattened covered electrical wire and the lower handle 9 is gripped to be pivoted upwardly toward the upper handle 1, the blade edge 7 of the lower cutting blade 4, the blade edge 31 of the upper cutting blade 30 and the stripping blade 37 cut into the insulating covering on the covered solid wire to a predetermined depth and the upper blade 30 and stripping blade 37 move.along the core wire whereby the insulator.
coating is pulled off the core wire.
As is clear.from the foregoing, according to the present invention, by placing a covered electrical wire from which the insulating covering is to be removed onto the holding portion of the lower ~aw and then gripping the lower handle to cause the handle to:pivot-upwardly, the insulating covering stripping. operation is performed in the axial direction of the wire and thus, the stripping can be efficiently performed even in a limited space. And since the upper and lower cutting blades project laterally of the side surfaces of the upper and lower handles, the electrical wire positioned between the upper and lower cutting blades : ;`
7~
1 will not impede the movemen-t of the handles, -the lower cuttin~ blade can be positioned in any desired position along the wire to thereby ensure positive stripping o~ the insulator coating coveriny a substan-tial distance in the longitudinal direction of the wire. Furthermore, during the stripping of the insulator coating, since the anti-slip member and lower cutting blade abut against the cut edge on the insulator coating, the wire is held against movement and displacemen-t to thereby ensure positive cut off of the insulating covering from a precise position thereon. And since the lower cutting blade is secured to-the lower jaw which is integral with the leading end of one of the handles and does not move during the stripping operation, the construction o~ the tool can be made simple and rigid.
Furthermore, since the guide member, upper cutting blade holding portion and stripping member are mounted on the handle by the common shaft and operated by the common connector rod, the operation mechanism of the tool is simple and compact and can be operated in a simple manner. Further-more, since the complementary arcuate blade edges are providedon the opposing upper and lower cutting blades in adjacent opposing upper and lower cutting blades in adjacent opposing relationship for stripping a flattened covered electrical wire of the insulator coating, the insulating covering can be-stripped off of a flattened covered electrical wire com-prisirg a plurality of covered wires as well as a covered solid wire.
.
~ 1S72~
1 While only one embodiment of the inven-tion has been shown and described in detail, it will be understood that the same is for illustration only and not to be taken ~s a defi~.
nition of the invention, reference being had for this purpose to the appended claims.
. - 17 -.
Claims (9)
1. A tool for stripping the insulating covering from a covered electrical wire having a core which comprises a main body consisting of a first handle having a lower jaw at the leading end and a second handle pivoted to said first handle by means of a shaft, a wire holding mechanism provided at the leading end portion of said main body for gripping said wire when the first and second handles are closed and cutting blade means provides at the leading end portion of said main body adjacent to said wire holding mechanism for cutting into said insulating covering and pulling the cut insulating covering off of the core of said wire longitudinally of said handles when said first and second handles are closed, said cutting blade means having an upper cutting blade and a lower cutting blade, said lower cutting blade being a stationary cutting blade secured to the upper surface of said lower jaw and said upper cutting blade being a movable cutting blade adapted to approach the lower cutting blade and move in the longitudinal direction of the handles when the first and second handles are closed, said wire holding mechanism and cutting blade means projecting laterally of said handles.
2. The tool as set forth in claim 1, in which said upper and lower cutting blades are provided with arcuate blade edges in adjacent relationship to each other for receiving covered solid wires and guides are provided adjacent to each of said blade edges for guiding said covered solid wires.
3. A tool as set forth in claim 2, in which said upper and lower cutting blades are also provided with groove-shaped blade edges in adjacent relationship to each other for receiving a flattened covered electrical wire and said guides are adapted to also guide said flattened covered electrical wire.
4. The tool as set forth in claim 1, said cutting blade means further including a stripping member adapted to cut into the underside of said insulating covering and pull the cut insulating covering off of the core of said wire longitudi-nally of said handles when the handles are closed.
5. The tool as set forth in claim 1, in which said wire holding mechanism comprises a lower holding portion formed on said lower jaw and an upper holding portion pivoted to said first handle and movable toward said lower holding portion as said handles are closed, the under surface of said upper holding portion having an anti-slip member attached thereto extending along the front surface of said upper cutting blade so as to abut against the cut end edge of said insulating covering left on the core of said wire when the insulating covering is cut.
6. A tool for stripping the insulating covering from a covered electrical wire having a core which comprises a main body consisting of a first handle having a lower jaw at the leading end and a second handle pivoted to said first handle by means of a shaft, a wire holding mechanism provided at the leading end portion of said main body for gripping said wire when the first and second handles are closed and
6. A tool for stripping the insulating covering from a covered electrical wire having a core which comprises a main body consisting of a first handle having a lower jaw at the leading end and a second handle pivoted to said first handle by means of a shaft, a wire holding mechanism provided at the leading end portion of said main body for gripping said wire when the first and second handles are closed and
Claim 6 continued...
cutting blade means provided at the leading end portion of said main body adjacent to said wire holding mechanism for cutting into said insulating covering and pulling the cut insulating covering off of the core of said wire longitudinally of said handles then said first and second handles are closed, said wire holding mechanism and cutting blade means projecting laterally of said handles, the cutting blade means having an upper cutting blade and a lower cutting blade, said lower cutting blade being a stationary cutting blade provided on the upper surface of said lower jaw, an upper cutting blade holder supported in the intermediate portion of said first handle for pivotal and axial movement relative to the first handle, said upper cutting blade being a movable cutting blade attached to the leading end of said upper cutting blade holder, a connector rod having the rear end of said upper cutting blade holder pivoted to one end thereof and having the other end pivoted to said leading end portion of the second handle, and said wire holding mechanism having an upper holding portion and a lower holding portion positioned in front of said upper and lower cutting blades, said lower holding portion being formed on the upper surface of said lower jaw, a guide member pivoted at the intermediate portion of said first handle and pivoted at the rear end at said one end of the connector rod for pivotal and axial movement relative to the first handle, said upper holding portion being formed on the undersurface of the leading end of said guide member and a spring biasing said connector rod in the counter-clock-wise direction.
cutting blade means provided at the leading end portion of said main body adjacent to said wire holding mechanism for cutting into said insulating covering and pulling the cut insulating covering off of the core of said wire longitudinally of said handles then said first and second handles are closed, said wire holding mechanism and cutting blade means projecting laterally of said handles, the cutting blade means having an upper cutting blade and a lower cutting blade, said lower cutting blade being a stationary cutting blade provided on the upper surface of said lower jaw, an upper cutting blade holder supported in the intermediate portion of said first handle for pivotal and axial movement relative to the first handle, said upper cutting blade being a movable cutting blade attached to the leading end of said upper cutting blade holder, a connector rod having the rear end of said upper cutting blade holder pivoted to one end thereof and having the other end pivoted to said leading end portion of the second handle, and said wire holding mechanism having an upper holding portion and a lower holding portion positioned in front of said upper and lower cutting blades, said lower holding portion being formed on the upper surface of said lower jaw, a guide member pivoted at the intermediate portion of said first handle and pivoted at the rear end at said one end of the connector rod for pivotal and axial movement relative to the first handle, said upper holding portion being formed on the undersurface of the leading end of said guide member and a spring biasing said connector rod in the counter-clock-wise direction.
7. The tool as set forth in claim 6 in which said first handle has a guide opening in substantially the central portion thereof, said upper cutting blade holder and said guide member being received in said guide opening, and a common shaft supporting said upper cutting blade holder and said guide member on said first handle.
8. The tool as set forth in claim 7 in which said upper cutting blade holder has an axial slot in the inter-mediate portion through which said common shaft extends loosely and said guide member has a slot at the rear end to which said one end of the connector rod is connected for pivotal and axial movement relative to the rod.
9. The tool as set forth in claim 8, further comprising a stripping member pivoted at the intermediate portion thereof to said first handle by said common shaft and being received in said guide opening, and said stripping member having an axial slot in the intermediate portion thereof in which said common shaft is received loosely, said stripping member having at the leading end a stripping portion including a stripping blade projecting upwardly along the back side of said lower cutting blade and having at the rear end a slot substantially normal to the axis of the handles for connecting said one end of the connector rod to the stripping member for pivotal and up and down movement of said one end of said connector rod.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP130273/1979 | 1979-10-09 | ||
| JP13027379A JPS5653515A (en) | 1979-10-09 | 1979-10-09 | Tool for separating insulating coating of electric wire |
| JP140084-9/1979 | 1979-10-09 | ||
| JP14008479U JPS5657615U (en) | 1979-10-09 | 1979-10-09 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1157244A true CA1157244A (en) | 1983-11-22 |
Family
ID=26465455
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000357805A Expired CA1157244A (en) | 1979-10-09 | 1980-08-07 | Tool for stripping insulating covering |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1157244A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8151670B2 (en) | 2008-08-01 | 2012-04-10 | Nelson James M | Sheath and conductor strippers |
-
1980
- 1980-08-07 CA CA000357805A patent/CA1157244A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8151670B2 (en) | 2008-08-01 | 2012-04-10 | Nelson James M | Sheath and conductor strippers |
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| Date | Code | Title | Description |
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| MKEX | Expiry |