JP2020174459A - Cable cutter - Google Patents

Abstract

To enable short-time and secure cutting by one-action and clear operation in a cable cutter cutting a cut-off wire having a rigid core in a sectional central part.SOLUTION: A cable cutter has a supporting point base 15, a base side handle lever 5 and a base side cutting blade 3 provided to the supporting point base 15, and a free side handle lever 4 and a free side cutting blade 2 held by the supporting point base 15. A link lever 38 is provided to the free side cutting blade 2, a long hole 30 is provided to the free side handle lever 4, the long hole 30 and the link lever 38 are connected through a link supporting point 12, three points of a cutter supporting point 10, a handle supporting point 11, and the link supporting point 12 are aligned on one straight line when both cutting blades 2 and 3 are in an angle of aperture of starting cutting a rigid core P of a cut-off wire W, and a distance between the link supporting point 12 and the handle supporting point 11 is arranged within a range indicating a reduction tendency.SELECTED DRAWING: Figure 1

Description

The present invention relates to a cable cutter that can be suitably used when manually cutting a wire to be cut such as an ACSR wire having a hard core at the center of a cross section.

Various electric wires are used for transmitting electric power in consideration of not only the type of allowable current but also the difference in the installation environment such as whether it is an overhead line or an underground line.
For example, a steel core aluminum stranded wire (hereinafter referred to as an ACSR wire) is relatively lightweight because it has a structure in which a zinc-plated steel wire is used as a core and the circumference is surrounded by a hard aluminum wire and twisted. Therefore, it is suitable for use on overhead lines provided that the area has little snowfall.

In this specification, a hard core such as a galvanized steel wire is referred to as a "hard core".
On the other hand, vinyl insulated wires (hereinafter referred to as IV wires) have a structure in which a plurality of copper wires are twisted together and are considered to be relatively heavy. Therefore, they are grounded in snowfall areas and aesthetic areas. It is said that it is suitable for use on the middle line.
Such electric wires (ACSR wire, IV wire, etc.) require cutting work at the installed site for various purposes such as natural disasters, accidents, construction, extension, branching, and maintenance such as replacement. In some cases. For cutting IV wires, a manual cutter called a cable cutter that opens and closes a pair of cutting blades (single-edged sharp blades) by opening and closing a pair of handle levers using a booster mechanism is used. Is normal.

On the other hand, in the case of ACSR wire, the steel wire that is the core is hard (has a hard core), so if you try to cut it with a cable cutter, the cutting edge of the cutting blade may be locally crushed. If the cable cutter with a damaged cutting edge is used continuously, the hard aluminum wire will be deformed into a cut surface that cannot be reconnected.
Therefore, conventionally, for example, a so-called feed blade type cutter in which a pair of handles are repeatedly opened and closed to gradually engage the rotary blades by using a ratchet mechanism has been used (Patent Document 1). etc).

In the cutter described in Patent Document 1, the cutting edge of the rotary blade is formed at an obtuse angle (that is, a loose angle exceeding 90 °) because it is premised on cutting a hard core, and the cutting edge is spilled or cut. It was prevented from collapsing.

Jikkai Sho 63-30424

In the cutting work of the ACSR wire, which is forced to work in a narrow and unstable work basket attached to the boom tip of the crane at a high place several meters to several tens of meters above the ground, a pair of feed blade type cutters is used. Work that requires the handle to be opened and closed many times with force is avoided.
In addition, when the ACSR wire is a live wire, there is a risk of causing so-called attraction, blow-off, electric shock, etc. due to high voltage and large current, so keep the cutter biting while approaching the ACSR wire for a long time. It can be said that such work is dangerous in the first place.

As a result, the current situation is that the development of a cable cutter that can cut the ACSR wire with a simple one-action operation and in a short time is awaited.
On the other hand, there may be a request to cut a thick electric wire such as an IV line in a single site where cutting work of the ACSR wire is required, or in a patrol destination site different from this site. In such a case, a cutter dedicated to the IV line, such as the cable cutter described above, is required in addition to the cutter for cutting the ACSR line.

This is because the cutter for cutting the ACSR wire has been provided with special measures such as obtuse angle of the cutting edge as disclosed in Patent Document 1. Therefore, when the IV wire is cut by this cutter, This is because the cut surface of the IV wire may be deformed to the extent that reconnection becomes impossible or difficult.
Therefore, in such a case, it is necessary to carry a plurality of types of cutters, which imposes a heavy burden on the operator, such as increasing the carrying volume and doubling the weight.

The present invention has been made in view of the above circumstances, and has made it possible to reliably cut a wire to be cut such as an ACSR wire having a hard core in the center of a cross section by a simple one-action operation and in a short time. It is intended to provide a cable cutter.
Further, the present invention can cut both a wire to be cut having a hard core and a wire to be cut without a hard core in an optimum manner (a simple one-action operation and a reliable cutting in a short time). ) It is an object of the present invention to provide a cable cutter capable of significantly reducing the burden of carrying the cutter by an operator.

In order to achieve the above object, the present invention has taken the following measures.
That is, the cable cutter according to the present invention is a cable cutter that cuts a wire to be cut having a hard core in the center of the cross section, and has a fulcrum base that supports a blade fulcrum and a handle fulcrum so that their axes are parallel to each other. With respect to the base side handle lever provided so as to project in a direction perpendicular to the axis of the handle fulcrum with respect to the fulcrum base, and the base side handle lever supported by the fulcrum base via the handle fulcrum. The free-side handle lever, which is held swingably in the direction of relative approach and separation, and the base-side cutting blade provided so as to project in the direction opposite to the projecting direction of the base-side handle with respect to the fulcrum base, and the above. By being supported by the fulcrum base via the fulcrum of the blade, it swings in the direction of switching between the open state in which the fitting space for the wire to be cut is formed with respect to the cutting blade on the base side and the closed state in which the cutting edges mesh with each other. It has a free-side cutting blade that is freely held, and the free-side cutting blade is provided with a link lever extending from the tip of the blade portion toward the base end on the opposite side beyond the fulcrum of the blade. The free side handle lever is provided with an elongated hole along the lever longitudinal direction on the handle end side of the handle fulcrum, and the elongated hole and the lever end of the link lever are slidably connected via the link fulcrum. As a result, the link fulcrum is allowed to approach the handle fulcrum when the free side cutting blade and the base side cutting blade are closed, and is allowed to separate from the handle fulcrum when the free side cutting blade is opened. When the opening angle between the blade and the base-side cutting blade is the angle at which the hard core arranged in the center of the cross section of the wire to be cut is started to be cut, the blade fulcrum, the handle fulcrum, and the link fulcrum are aligned. It is characterized in that the distance between the link fulcrum and the handle fulcrum is arranged within a range showing a tendency to shorten.

In the free-side cutting blade and the base-side cutting blade, sharp blades are formed in the respective cutting edge regions that come into contact with the side surfaces of the wire to be cut when both cutting blades are closed, so that both cutting blades are closed. It is preferable that a pressing blade having a surface-cutting end that makes surface contact with the wire to be cut is formed in each blade edge region that advances and abuts on the hard core.
In this case, the cutting edge of the free-side cutting blade and the cutting edge of the base-side cutting blade have a hugging curve that shifts the wire to be cut from the sharp blade to the pressing blade as both cutting blades close. It is even better if it is given.

The fulcrum base is provided with a second fulcrum arrangement portion that allows the handle fulcrum to be selectively supported in a different arrangement from the fulcrum arrangement portion of the handle fulcrum, and the second fulcrum arrangement portion is the free. When the handle fulcrum supported by the second fulcrum arrangement portion is aligned with the blade fulcrum and the link fulcrum in the process of bringing both the side and base side handle levers closer to each other, the free side cutting blade and the base It can be assumed that the opening angle with the side cutting blade is set to the angle at which the side surface of the wire to be cut is started to be cut.

Further, the cutter of the present invention is provided with a fulcrum base that supports the blade fulcrum and the handle fulcrum so that their axes are parallel to each other, and a fulcrum base that projects in a direction perpendicular to the axis of the handle fulcrum with respect to the fulcrum base. A base-side handle lever, a free-side handle lever that is supported by the fulcrum base via the handle fulcrum and is held swingably in a direction in which the base-side handle lever approaches and separates from the base-side handle lever. The base-side cutting blade is provided so as to project in the direction opposite to the protruding direction of the base-side handle with respect to the fulcrum base, and the base-side cutting blade is supported by the fulcrum base via the blade fulcrum. The fulcrum base has a free-side cutting blade that is held swingably in a direction that switches between an open state in which a fitting space for the wire to be cut is formed and a closed state in which the cutting edges mesh with each other. A plurality of fulcrum arrangement portions for supporting the handle fulcrum are provided, and the opening angle when the meshing force between the base side cutting blade and the free side cutting blade peaks can be changed for each of the selected fulcrum arrangement portions. It is characterized by being.

The cable cutter according to the present invention has come to be able to reliably cut a wire to be cut such as an ACSR wire having a hard core in the center of a cross section by a simple one-action operation and in a short time. In addition, it has become possible to cut both a wire to be cut having a hard core and a wire to be cut not having a hard core in an optimum manner (a simple one-action operation and a reliable cutting in a short time).

It is an enlarged view of the main part which showed the state of cutting in the case of the 1st use mode of FIG. It is a side view which showed the 1st use mode for cutting the wire to be cut which has a hard core about one Embodiment of the cable cutter which concerns on this invention. It is an enlarged view of the main part which showed the state of cutting in the case of the 2nd use mode of FIG. It is a side view which showed the 2nd use mode for cutting the wire to be cut which does not have a hard core about one Embodiment of the cable cutter which concerns on this invention. It is a view of arrow AA of FIG. It is the BB line enlarged sectional view of FIG. FIG. 3 is an enlarged cross-sectional view taken along the line CC of FIG. In the cross-sectional view showing the ACSR line, (a) is a type having one core, and (b) is a type having a plurality of cores.

Hereinafter, embodiments of the present invention will be described.
1 to 7 show an embodiment of a cable cutter (hereinafter referred to as "the cutter of the present invention") 1 according to the present invention.
The present embodiment has a first usage mode (FIGS. 1 and 2) suitable for cutting a wire to be cut such as an ACSR wire having a hard core, and cutting a wire to be cut such as an IV wire having a hard core. It is shown that it is possible to switch to the second usage mode (FIGS. 3 and 4) suitable for the above. In the following, the structure and structure will be described mainly with reference to FIGS. 1 and 2 showing the first usage mode.

The cutter 1 of the present invention is characterized in that it can be switched between the first usage mode and the second usage mode, but in addition to the above, at least for a wire rod to be cut having a hard core. It has a characteristic configuration in that it can be reliably cut in a short time by a simple one-action operation.
Incidentally, as shown in FIG. 8A, the wire to be cut W having the hard core P is a hard core P made of a galvanized steel wire or the like, as is clear from the cross-sectional structure of the ACSR wire as a typical example thereof. It has a structure in which a plurality of transmission lines S made of hard aluminum wire or the like are arranged around it.

As shown in FIG. 8B, a plurality of hard cores P may be used, and the number of transmission lines S varies depending on the number of hard cores P used, the wire diameter, and the like. Further, although not shown, a tube made of a coating material for insulation may be formed on the outer side of the transmission line S.
First, the outline of the cutter 1 of the present invention will be described. As shown in FIG. 2, the cutter 1 of the present invention has a pair of cutting blades 2 and 3 and a pair of handle levers 4 and 5 for opening and closing these cutting blades 2 and 3, and one of the cutting blades. A link mechanism 6 is provided between 3 and one of the handle levers 4.

Then, the switching between the first usage mode and the second usage mode is performed by the blade fulcrum 10 that supports the relative opening / closing movement of the cutting blades 2 and 3, the handle fulcrum 11 that supports one of the handle levers 4, and the link mechanism 6. Between the state in which the three fulcrums of the provided link fulcrum 12 are lined up in a straight line (see FIGS. 1 and 3) and the opening angles α and β formed by the two cutting blades 2 and 3 under this state. The basic precondition is that a specific correlation is established for each. The specific switching operation is performed by rearranging the handle fulcrum 11.

The opening angles α and β refer to the angles generated between the cutting edges of both cutting blades 2 and 3 at the time of “starting cutting” of the wire W to be cut, but the time of “starting cutting” is defined as the angle. The part to be cut of the wire to be cut W (the position in the radial direction, which is the side surface of the hard core P or the side surface of the wire to be cut W itself (a tube provided with an insulating coating material) depending on the usage mode. In the case of W, it may be (including the side surface of the tube)), and either of them may be used as a rough guideline as to whether the cutting blades 2 and 3 are in contact with each other or in a close state immediately before the contact. And.

The point is that if the operator brings the handle levers 4 and 5 closer to each other from the time of "start of cutting", the cutting of the part to be cut in the wire to be cut W is started immediately after that. And.
The cutter 1 of the present invention having such a configuration is a one-action straightforward method regardless of whether the wire to be cut W has or does not have a hard core P by rearranging the handle fulcrum 11. It is possible to disconnect reliably in a short time with a smooth operation. Needless to say, the cross section of the wire rod W to be cut after cutting is such that a clean cut surface that does not hinder reconnection can be obtained.

Hereinafter, the cutter 1 of the present invention will be described in detail. The cutter 1 of the present invention has a pair of cutting blades 2 and 3 and a pair of handle levers 4 and 5 as described above, and in addition to these, a gap between one cutting blade 3 and one handle lever 5 is provided. It has a fulcrum base 15 that is fixedly connected.
Due to the existence of the fulcrum base 15, the cutting blade 3 and the handle lever 5 having a fixed connection relationship with the fulcrum base 15 are hereinafter referred to as "base side cutting blade 3" and "base side handle lever 5", and are referred to as the fulcrum base 15. The cutting blade 2 and the handle lever 4 which are connected but not fixed (movable) are hereinafter referred to as "free side cutting blade 2" and "free side handle lever 4".

The fulcrum base 15 is formed in a plate shape so that the blade fulcrum 10 and the handle fulcrum 11 can be supported in a state where their axes are parallel to each other. Although not shown, the crank breaks in the plate thickness direction with respect to the fulcrum base 15 in order to avoid contact interference with the free side cutting blade 2 (link lever 38 described later) due to the swing of the free side handle lever 4. A structure may be adopted.

Here, the blade fulcrum 10 and the handle fulcrum 11 can be "supported" not only when the blade fulcrum 10 and the handle fulcrum 11 are fixed in a pin-like protruding state from the fulcrum base 15, but also a pin-shaped blade fulcrum. It also includes the case where an insertion hole (or recess) for inserting the 10 or the handle fulcrum 11 is provided.
In short, the fulcrum base 15 itself is not limited to include the actual blade fulcrum 10 and the handle fulcrum 11, but may be configured to "support" the blade fulcrum 10 and the handle fulcrum 11.

To give a specific example, the blade fulcrum 10 may be equipped as a separate shaft, a shaft with a head, a bolt, or the like without being fixed to any of the cutting blades 2 and 3 and the fulcrum base 15. In some cases (for example, in the case where the specification does not switch between the first usage mode and the second usage mode), it may be fixed to the cutting blades 2 and 3, or may be fixed to the fulcrum base 15. ..

Similarly, the handle fulcrum 11 may be equipped as a separate shaft such as a straight shaft, a shaft with a head, and a bolt without being fixed to any of the handle levers 4 and 5 and the fulcrum base 15. In some cases (for example, when the specification does not switch between the first usage mode and the second usage mode), the handle levers 4 and 5 may be fixed, or the fulcrum base 15 may be fixed. ..

In the present embodiment, an insertion hole is formed that penetrates the fulcrum base 15 in the plate thickness direction, and a structure is adopted in which a straight shaft, a headed shaft, a bolt, or the like is inserted into the insertion hole. A blade fulcrum 10 and a handle fulcrum 11 are formed at a portion protruding from the fulcrum base 15.
That is, as shown in FIG. 5, a hexagon headed bolt 17 is inserted into one of the blade fulcrums 10 from the fulcrum base 15 (base side cutting blade 3) side toward the free side cutting blade 2. The hexagon headed bolt 17 is fixed by screwing a nut 18 to the bolt end on the side that penetrates the free side cutting blade 2.

On the other hand, the handle fulcrum 11 has a pin that penetrates the shaft end in the radial direction from the direction opposite to that of the blade fulcrum 10 with respect to the fulcrum base 15 (from the free side handle lever 4 side toward the fulcrum base 15). It has a structure in which a headed shaft 19 having an insertion hole is inserted. The headed shaft 19 is fixed by inserting the snap pin 20 into the pin insertion hole after fitting the free side handle lever 4 into the shaft end on the side penetrating the fulcrum base 15.

By the way, the fulcrum base 15 is provided with at least two insertion holes for forming the handle fulcrum 11 (for inserting the headed shaft 19). One of the insertion holes is the first fulcrum arrangement portion 21, and the other one is the second fulcrum arrangement portion 22. In addition, more insertion holes may be formed to provide the third and subsequent fulcrum arrangement portions.
Since the headed shaft 19 forming the handle fulcrum 11 as described above has a pin insertion hole formed at the shaft end thereof, the handle fulcrum 11 can be inserted and removed by inserting and removing the snap pin 20 into the pin insertion hole. The free side handle lever 4 can be freely attached to and detached from the handle, and the handle fulcrum 11 can be freely attached to and detached from each insertion hole of the fulcrum base 15.

Therefore, the handle fulcrum 11 can be selectively formed for either the first fulcrum arrangement portion 21 or the second fulcrum arrangement portion 22 (the arrangement of the free side handle lever 4 can be rearranged). It has become. The proper use of the first fulcrum arrangement portion 21 and the second fulcrum arrangement portion 22 will be described later.
The base side handle lever 5 is provided so as to project from the fulcrum base 15 in a direction perpendicular to the axis of the handle fulcrum 11, and an elastic grip 25 is provided at the protruding end. ..

In the present embodiment, the lever body is formed of a pipe material for the purpose of weight reduction, and a mandrel (not shown) for fitting this pipe material is provided in the fulcrum base 15, and the fulcrum base 15 (mandrel) and the base side handle lever are provided. It has a structure in which 5 (a lever body made of a pipe material) is connected by a bolt 26. However, the base side handle lever 5 can be used as a solid material, or the fulcrum base 15 and the base side handle lever 5 can be integrally formed.

The free side handle lever 4 is supported by the fulcrum base 15 via the handle fulcrum 11, and a grip 27 made of an elastic material is provided at an end portion on the protruding side. Therefore, the free-side handle lever 4 is made swingable around the handle fulcrum 11, and the movement of approaching and separating from the base-side handle lever 5 can be caused.
In the present embodiment, the lever body of the free side handle lever 4 is also made of a pipe material for the purpose of weight reduction. A portion for supporting the free side handle lever 4 on the handle fulcrum 11 of the fulcrum base 15 is formed by a plate-shaped lever head 28. Of course, the free side handle lever 4 may be used as a solid material.

Then, a mandrel (not shown) for fitting the pipe material of the lever body is provided in the lever head 28, and the lever head 28 (mandrel) and the free side handle lever 4 (lever body made of pipe material) are connected by bolts 29. It is a structure.
The lever head 28 of the free side handle lever 4 is provided with an elongated hole 30 along the longitudinal direction of the lever so as to be closer to the handle end side than the handle fulcrum 11. The elongated hole 30 is an element of the link mechanism 6 described above.

The base-side cutting blade 3 is provided so as to project from the fulcrum base 15 in the direction opposite to the projecting direction of the base-side handle lever 5.
The cutter 1 of the present invention of the present embodiment is intended to be suitably used by a right-handed worker. Therefore, when the cutter 1 of the present invention is oriented horizontally so that the free side handle lever 4 connected to the link mechanism 6 faces upward and the base side handle lever 5 faces downward, the base side cutting blade 3 is used. The angle of the base-side cutting blade 3 with respect to the fulcrum base 15 is set so that the tip portion on the blade tip side faces diagonally downward.

On the other hand, the free side cutting blade 2 is supported by the fulcrum base 15 via the blade fulcrum 10. By such support by the blade fulcrum 10, the free side cutting blade 2 switches between an open state in which a fitting space for the wire rod W to be cut is formed with respect to the base side cutting blade 3 and a closed state in which the cutting edges mesh with each other. It is swingable in the direction.
Since the swing (opening / closing operation) of the free side cutting blade 2 is performed with reference to the base side cutting blade 3, as described above, the angle setting of the base side cutting blade 3 with respect to the fulcrum base 15 is the free side cutting. The blade 2 also leads to the opening / closing operation with the tip portion of the blade tip end obliquely downward. As a result, the work of sandwiching the wire rod W to be cut and the cutting work can be easily and quickly performed, and the operator can exert an appropriate and sufficient operating force for operating the handle levers 4 and 5.

Further, the free side cutting blade 2 and the base side cutting blade 3 have their respective cutting edges (parts provided with meshing edges) farther from the cutting edge fulcrum 10 than the base side closer to the cutting edge fulcrum 10 ( The closer to the tip of the blade tip), the closer and intersecting the relative opposite curvatures are provided.
Therefore, when the wire to be cut W is fitted between the free side cutting blade 2 and the base side cutting blade 3 (see FIG. 3), both cutting blades 2 and 3 are closed. From the state where the cutting edges of both cutting blades 2 and 3 are in contact with the side surface of the wire to be cut W, the wire to be cut W gradually shifts toward the blade fulcrum 10 and is embraced (see FIG. 1). The curve adopted to produce such an action is referred to herein as a "hugging curve".

When the both cutting blades 2 and 3 are started to close and first come into contact with the wire rod W to be cut (FIG. 3), the cutting edge region as shown in FIG. 7 is a sharp blade with a sharply sharpened cutting edge as shown in FIG. 35 is formed. Therefore, the side surface portion of the wire to be cut W, which is relatively soft (including the side surface of the tube in the case of the wire W having a tube made of an insulating coating material), is smoothly cut while producing a clean cut surface. Will be done.

On the other hand, when the closing of both cutting blades 2 and 3 progresses and the wire rod W to be cut is brought closer to the blade fulcrum 10 by the hugging curve (the state of FIG. 1 and that of both cutting blades 2 and 3). A pressing blade 36 as shown in FIG. 6 is formed in the cutting edge region (the stage where the cutting edge bites into the transmission line S and starts abutting against the hard core P).
The pressing blade 36 is provided with a surface-cutting end that makes surface contact with the wire to be cut W (here, the hard core P). That is, since it is possible to prevent the sharp blade 35 from coming into contact with the hard core P, it is possible to prevent the sharp blade 35 from being locally crushed or chipped due to the cutting reaction force of the hard core P.

Such a free-side cutting blade 2 is provided with a link lever 38 extending from the tip of the blade portion toward the base end on the opposite side beyond the blade fulcrum 10. A link fulcrum 12 for connecting to the elongated hole 30 provided in the lever head 28 of the free side handle lever 4 is provided at the tip of the link lever 38.
In the present embodiment, as shown in FIG. 5, the link fulcrum 12 has a structure in which a hexagon headed bolt 39 is inserted from the lever head 28 side of the free side handle lever 4 toward the link lever 38. The hexagon headed bolt 39 is fixed by screwing a nut 40 to the bolt end on the side where the link lever 38 is penetrated.

As a result, when the free side cutting blade 2 and the base side cutting blade 3 are closed, the link fulcrum 12 is allowed to slide in the direction approaching the handle fulcrum 11, and when the link fulcrum 12 is opened, the slide is allowed to slide in the direction away from the handle fulcrum 11. The link mechanism 6 described above is formed so as to be permitted.
By providing this link mechanism 6, the free side handle lever 4 has a grip 27.
The first-stage boosting mechanism is configured with [force point], handle fulcrum 11 as [fulcrum], and link fulcrum 12 as [action point], and the free side cutting blade 2 sets link fulcrum 12 as [force point] and handle fulcrum. A second-stage boosting mechanism is configured in which 11 is a [fulcrum] and the cutting edge of the cutting blade 2 is a [point of action]. That is, the cutter 1 of the present invention is provided with a two-step boosting mechanism between the free side handle lever 4 and the cutting edge of the free side cutting blade 2.

In the cutter 1 of the present invention, as described above, if the first fulcrum arrangement portion 21 of the fulcrum base 15 is selected, the handle fulcrum 11 is arranged, and the free side handle lever 4 is supported by the handle fulcrum 11, FIG. The first usage mode shown in FIG. 2 (a mode suitable for cutting the wire to be cut W having the hard core P) can be obtained, the second fulcrum arrangement portion 22 of the fulcrum base 15 is selected, and the handle fulcrum 11 is arranged. If the free side handle lever 4 is supported by the handle fulcrum 11, the second usage mode shown in FIGS. 3 and 4 (a mode suitable for cutting the wire to be cut W having no hard core) can be obtained.

The link lever 38 is attached to the fulcrum base 15 so that the cutting blades 2 and 3 do not swing in the closing direction any more after the cutting blades 2 and 3 are completely closed. A stopper 42 is provided so as to regulate the swing region of the free side cutting blade 2. The stopper 42 is arranged so that a contact relationship with the link lever 38 can be obtained in both the first usage mode (see FIG. 2) and the second usage mode (see FIG. 4).

In the first usage mode, when the three points of the blade fulcrum 10, the handle fulcrum 11, and the link fulcrum 12 are aligned as shown in FIG. 1, the opening angles α of both cutting blades 2 and 3 are exactly the wire rod W to be cut. The point at which the hard core P of the above is started to be cut is reached.
Further, in the link mechanism 6, the opening angle of both cutting blades 2 and 3 is increased due to the relationship between the swing of the link lever 38 with the blade fulcrum 10 as the fulcrum and the swing of the free side handle lever 4 with the handle fulcrum 11 as the fulcrum. As the value becomes smaller, the distance between the link fulcrum 12 and the handle fulcrum 11 has a correlation showing a shortening tendency.

That is, as is clear from FIG. 1, if the distance between the link fulcrum 12 and the handle fulcrum 11 is short (L1> L2 as an example), the length of the free side handle lever 4 is constant. It is clear that the correlation that the distance from the link fulcrum 12 to the grip 27 (power point position) of the free side handle lever 4 becomes long (L3 <L4) holds.
Therefore, by opening both cutting blades 2 and 3 and fitting the wire to be cut W between them and operating both handle levers 4 and 5 in the direction of mutual approach, first, both cutting blades 2 and 3 are operated. Comes into contact with the side surface of the wire to be cut W and bites into it, and then the cutting edges of both cutting blades 2 and 3 come into contact with the hard core P of the wire to be cut W. Immediately after that, the link fulcrum 12 Since the distance from the free side handle lever 4 to the grip 27 is always long, the cutting of the hard core P is started while the torque tends to increase accordingly.

Therefore, in a state where the cutting force transmitted from both handle levers 4 and 5 to both cutting blades 2 and 3 peaks, an appropriate and sufficient cutting force is transmitted to the hard core P via both cutting blades 2 and 3. , The cutting work can be performed easily and quickly.
Further, at this time, since the cutting edge regions of both cutting blades 2 and 3 are the regions where the pressing blades 36 are provided, the cutting blades 2 and 3 are not crushed or chipped.

On the other hand, in the second usage mode, when the three points of the blade fulcrum 10, the handle fulcrum 11, and the link fulcrum 12 are aligned as shown in FIG. 3, the opening angles β of both cutting blades 2 and 3 are exactly the same. , The time point at which the side surface of the wire rod W to be cut is started to be cut is reached.
Further, in the link mechanism 6, the opening angle of both cutting blades 2 and 3 is increased due to the relationship between the swing of the link lever 38 with the blade fulcrum 10 as the fulcrum and the swing of the free side handle lever 4 with the handle fulcrum 11 as the fulcrum. As the value becomes smaller, the distance between the link fulcrum 12 and the handle fulcrum 11 has a correlation showing a shortening tendency (this point has the same effect as in the first usage mode).

Therefore, by opening both cutting blades 2 and 3 and fitting the wire to be cut W between them and operating both handle levers 4 and 5 in the direction of mutual approach, both cutting blades 2 and 3 can be made. Immediately after the contact with the side surface of the wire to be cut W, the distance from the link fulcrum 12 to the grip 27 of the free side handle lever 4 is always long, so that the torque tends to increase and the wire W to be cut is cut. Is started.

Therefore, in a state where the cutting force transmitted from both handle levers 4 and 5 to both cutting blades 2 and 3 peaks, an appropriate and sufficient cutting force is applied to the side surface of the wire to be cut W via both cutting blades 2 and 3. Is transmitted, and the cutting work can be performed easily and quickly.
Further, at this time, since the cutting edge regions of the both cutting blades 2 and 3 are the regions where the sharp blades 35 are provided, the cutting can be performed smoothly while producing a clean cutting surface.

As is clear from the above-mentioned details, the cutter 1 of the present invention can reliably cut a wire to be cut W such as an ACSR wire having a hard core P in the center of a cross section by a simple one-action operation and in a short time. Became.
Further, the handle fulcrum 11 can be rearranged according to the difference in the wire to be cut W to be cut (the wire W having the hard core P and the wire W not to be cut). The wire to be cut W can also be cut in an optimum manner (it can be reliably cut in a short time by a simple one-action operation).

By the way, the present invention is not limited to the above-described embodiment, and can be appropriately modified depending on the embodiment.
For example, the first embodiment shown in FIGS. 1 to 7 is mainly a right-handed operation regarding the relationship between the direction in which the tips of the blades of the cutting blades 2 and 3 are directed and the arrangement of the handle levers 4 and 5. It is designed so that it is easy for a person to use and can exert operability. On the other hand, in consideration of being easy for left-handed workers to use and exerting force, the relationship between the direction in which the tips of the blades of both cutting blades 4 and 5 are directed and the arrangement of both handle levers 4 and 5. It is also possible to reverse.

The ACSR wire is exemplified as the wire to be cut W having a hard core, and the IV wire is exemplified as the wire W to be cut without a hard core, but none of them is limited to the case of cutting other wire rods. Needless to say, the cutter 1 of the present invention can be preferably used.

1 Cable cutter (cutter of the present invention)
2 Free side cutting blade 3 Base side cutting blade 4 Free side handle lever 5 Base side handle lever 6 Link mechanism 10 Blade fulcrum 11 Handle fulcrum 12 Link fulcrum 15 fulcrum base 17 Hexagon head bolt 18 Nut 19 Head shaft 20 Snap pin 21 1st fulcrum placement 22 2nd fulcrum placement 25 Grip 26 Bolt 27 Grip 28 Lever head 29 Bolt 30 Long hole 35 Sharp blade 36 Pressing blade 38 Link lever 39 Hexagon head bolt 40 Nut 42 Stopper α Opening angle β Opening angle P Hard core S Transmission line W Cut wire

Claims (5)

In a cable cutter that cuts a wire to be cut having a hard core in the center of the cross section,
A fulcrum base that supports the blade fulcrum and handle fulcrum so that their axes are parallel to each other,
A base-side handle lever provided so as to project in a direction perpendicular to the axis of the handle fulcrum with respect to the fulcrum base.
A free-side handle lever that is supported by the fulcrum base via the handle fulcrum and is held swingably in a direction in which it approaches and separates from the base-side handle lever.
A base-side cutting blade provided so as to project in the direction opposite to the projecting direction of the base-side handle with respect to the fulcrum base.
By being supported by the fulcrum base via the blade fulcrum, it swings in the direction of switching between an open state in which a fitting space for the wire to be cut is formed with respect to the base-side cutting blade and a closed state in which the cutting edges mesh with each other. Free side cutting blade that is held freely,
Have and
The free side cutting blade is provided with a link lever extending from the tip of the blade portion toward the base end on the opposite side beyond the fulcrum of the blade.
The free side handle lever is provided with an elongated hole along the lever longitudinal direction on the handle end side of the handle fulcrum, and the elongated hole and the lever end of the link lever are slidably connected via the link fulcrum. As a result, the link fulcrum is allowed to approach the handle fulcrum when the free side cutting blade and the base side cutting blade are closed, and is allowed to separate from the handle fulcrum when opened.
When the opening angle between the free-side cutting blade and the base-side cutting blade is an angle at which the hard core of the wire to be cut is started to be cut, the three points of the blade fulcrum, the handle fulcrum, and the link fulcrum are aligned. Moreover, the cable cutter is characterized in that the distance between the link fulcrum and the handle fulcrum is arranged within a range showing a tendency to shorten. In the free side cutting blade and the base side cutting blade
A sharp blade is formed in each cutting edge region that comes into contact with the side surface of the wire to be cut when both cutting blades are closed.
A claim characterized in that, in each of the cutting edge regions where the closing motion of both cutting blades progresses and abuts on the hard core, a pressing blade having a surface-cutting end that makes surface contact with the wire to be cut is formed. Item 1. The cable cutter according to item 1. The cutting edge of the free-side cutting blade and the cutting edge of the base-side cutting blade are provided with a hugging curve that shifts the wire to be cut from the sharp blade to the pressing blade as both cutting blades close. The cable cutter according to claim 1 or 2, wherein the cable cutter is provided. The fulcrum base is provided with a second fulcrum arrangement portion that allows the handle fulcrum to be selectively supported in a different arrangement from the fulcrum arrangement portion of the handle fulcrum.
In the second fulcrum arrangement portion, when the handle fulcrum supported by the second fulcrum arrangement portion is aligned with the blade fulcrum and the link fulcrum in the process of bringing both the free side and the base side handle levers closer to each other. 1. Any one of claims 1 to 3, wherein the opening angle between the free-side cutting blade and the base-side cutting blade is set to an angle at which the side surface of the wire to be cut is started to be cut. The cable cutter described in the section. A fulcrum base that supports the blade fulcrum and handle fulcrum so that their axes are parallel to each other,
A base-side handle lever provided so as to project in a direction perpendicular to the axis of the handle fulcrum with respect to the fulcrum base.
A free-side handle lever that is supported by the fulcrum base via the handle fulcrum and is held swingably in a direction in which it approaches and separates from the base-side handle lever.
A base-side cutting blade provided so as to project in the direction opposite to the projecting direction of the base-side handle with respect to the fulcrum base.
By being supported by the fulcrum base via the blade fulcrum, it swings in the direction of switching between an open state in which a fitting space for the wire to be cut is formed with respect to the base-side cutting blade and a closed state in which the cutting edges mesh with each other. Free side cutting blade that is held freely,
Have,
The fulcrum base is provided with a plurality of fulcrum arrangement portions for supporting the handle fulcrum.
A cable cutter characterized in that the opening angle when the meshing force between the base-side cutting blade and the free-side cutting blade peaks can be changed for each of the selected fulcrum arrangement portions.

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