Accidental cut-off prevention device

Abstract

The present invention provides a device to prevent accidental cutting, which ensures the clarity of the cable to be cut and prevents other cables from mistakenly entering the cutting area. [Solution] The device comprises an electric cutter 20 for cutting communication and power cables, a wire tag 40 that constitutes an enclosed space through which the cable to be cut 60 is inserted, a fixing arm 32 for fixing the wire tag 40 to secure an enclosed space of a predetermined shape, and a protective frame 30 having a notch that allows the cable to be cut 60, which is inserted through the wire tag 40, to enter the movable range of the cutting blade 22 that constitutes the electric cutter 20. The wire tag 40 also serves as a trigger for the power supply circuit, and power is supplied to the electric cutter 20 by fixing the wire tag 40 to the protective frame 30.

Description

Technical Field

[0001] The present invention relates to a mis-cutting prevention device, and particularly relates to a mis-cutting prevention device suitable for preventing mis-cutting by a cable cutter when it is necessary to selectively cut a cable to be cut among a plurality of cables (communication cables, power cables, etc.) existing in the same route.

Background Art

[0002] Various means for preventing mis-cutting when removing communication cables, power cables, etc. have been proposed. However, most of them are like the technology disclosed in Patent Document 1, which detects the presence or absence of power supply to the cable and does not cut when power supply is confirmed. In fact, preventing mis-cutting of communication cables for which the presence or absence of power supply cannot be confirmed relies on analog technology.

[0003] Here, the technology (mis-cutting prevention device) disclosed in Patent Document 1 is to attach a clamp sensor having a C-shaped opening / closing part to the cutting blade of a cutting tool for cable cutting. In such a mis-cutting prevention device, by inserting the cable to be cut between the paired cutting blades and closing the clamp sensor, the presence or absence of power supply to the inserted cable is inspected. As a result of the inspection, if it is determined that there is power supply to the cable, the locking member operates and the cutting blade of the cutting tool cannot be closed, so that the cable cannot be cut.

[0004] With such a mis-cutting prevention device, it is considered that it is possible to avoid accidentally cutting a cable (live wire) for which power supply is confirmed. However, when the cable bundle is a communication cable, a situation may occur where power supply is not recognized even in cables that are not the cutting target. In such a case, even if a cable that is not the cutting target is included in the cables inserted into the clamp sensor, the locking member does not operate, and there is a possibility of accidentally cutting a cable that is not the cutting target.

Prior Art Documents

[0005] [Patent Document 1] Japanese Patent Publication No. 2014-39346 [Overview of the project] [Problems that the invention aims to solve]

[0006] Therefore, the present invention aims to provide a device that prevents accidental cutting, has a simple configuration, does not require selection of cable type, ensures clarity of the cable to be cut, and prevents cables other than the cable to be cut from accidentally entering the cutting area. [Means for solving the problem]

[0007] The present invention, which aims to achieve the above objective, comprises an electric cutter for cutting communication and power cables, a wire tag that constitutes a surrounding space through which the communication and power cables to be cut are inserted, a fixing arm for fixing the wire tag to secure a surrounding space of a predetermined shape, and a protective frame having a notch that allows the communication and power cables inserted through the wire tag to enter the movable range of the cutting blade constituting the electric cutter. The wire tag also serves as a trigger for an electrical circuit, and power is supplied to the electric cutter by fixing the wire tag to the protective frame.

[0008] Furthermore, in a device for preventing accidental cutting having the above-described features, the wire tag is provided with a plurality of connection terminals arranged spaced apart from each other, and a conductor arranged between adjacent connection terminals. The fixing arm is provided with a plurality of fixing terminals corresponding to the connection terminals. By connecting the connection terminals to the fixing terminals, both the fixing of the wire tag and the conductivity of the conductor are achieved. With these features, current cannot be supplied unless the wire tag is spread out to secure the surrounding space. Therefore, it is possible to reliably prevent cables other than the communication and power cables to be cut from entering the movable range of the cutting blade.

[0009] Furthermore, in a miscutting prevention device having the above-described features, it is desirable to arrange a current-carrying joint between the tool body constituting the electric cutter and the battery attached to the electric cutter, forming a bypass path that prevents direct current flow from the battery to the tool body, and to electrically connect the current-carrying joint and the protective frame. With these features, it becomes possible to configure a miscutting prevention device simply by attaching the current-carrying joint, protective frame, and wire tag, without modifying the existing electric cutter itself. [Effects of the Invention]

[0010] The accidental disconnection prevention device, having the features described above, has a simple configuration while ensuring the clarity of the cable to be cut and preventing other cables from accidentally entering the cutting area. [Brief explanation of the drawing]

[0011] [Figure 1] This figure shows the external configuration of the accidental cutting prevention device according to the embodiment. [Figure 2] This figure shows the protective ring removed from the accidental cutting prevention device according to the embodiment. [Figure 3] This is a block diagram showing the configuration of the electrical system in the accidental disconnection prevention device according to the embodiment. [Figure 4] This figure shows an example configuration of connection terminals and fixing terminals for securing wire tags to a protective frame. [Figure 5] This is a flowchart illustrating how to use the accidental cutting prevention device. [Modes for carrying out the invention]

[0012] Hereinafter, embodiments of the accidental cutting prevention device of the present invention will be described in detail with reference to the drawings. The embodiments shown below are some of the preferred forms for carrying out the present invention, and even if some of the configuration is changed, they can still be considered part of the present invention, as long as the effects are achieved.

[0013] [composition] First, the configuration of the accidental disconnection prevention device according to this embodiment will be described with reference to Figures 1 to 4. In the drawings, Figure 1 is a diagram showing the external configuration of the accidental disconnection prevention device according to this embodiment, and Figure 2 is a diagram showing the state with the wire tag removed. Figure 3 is a block diagram showing the configuration of the electrical system in the accidental disconnection prevention device according to this embodiment. Figure 4 is a diagram for explaining the relationship between the connection terminal of the wire tag and the fixing terminal of the protective ring.

[0014] The accidental cutting prevention device 10 according to this embodiment includes an electric cutter 20, a wire tag 40, a protective frame 30, and a power-carrying joint 50. The electric cutter 20 is a tool for cutting cables (hereinafter, the cable to be cut will be referred to as the cable to be cut 60, and other cables will be referred to as cables 62), and includes at least a cutting blade 22, a tool body 24, and a battery 26. The cutting blade 22 is a pincer-shaped blade equipped with a pair of opposing blades 22a and 22b, and the cutting portion is provided with a curved portion to prevent the cable to be cut 60 from slipping. The pair of opposing blades 22a and 22b slide so as to close around a base point, thereby cutting the cable to be cut 60 that is intercepted by the curved portion. The tool body 24 serves as the handle of the electric cutter 20 and supports the base of the cutting blade 22, and is an element that operates the cutting blade 22 by pulling the trigger 24a, which activates a motor (not shown) or the like provided inside. Furthermore, the battery 26 is preferably a rechargeable battery and is an element that plays the role of supplying power to the tool body 24.

[0015] The wire tag 40 is a tag that plays a role in identifying the cable 60 to be cut. The wire tag 40 can be any material that can form an enclosed space with a string-like member, and its specific form is not limited. In terms of the structural aspects of the wire tag 40, it is preferable to mainly consist of conductors 42 (42a-42e) covered with an insulator. The wire tag 40 is equipped with multiple (six in the example shown in Figures 1 to 3) connection terminals 44 (44a-44f), and adjacent conductors 42 are arranged via each connection terminal 44 and configured to be electrically separated. There are no limitations on the number or shape of the connection terminals 44, and it is sufficient to have a minimum of two connection terminals 44 (at the start and end points of one conductor 42).

[0016] Here, the connection terminal 44 is configured to achieve electrical continuity between adjacent conductors 42 by being connected to the fixed terminals 34 (34a - 34f) provided on the protection frame 30, which will be described in detail later. An insulating member 46 is disposed between the connection terminal 44a and the connection terminal 44f, which are to be connected to the fixed terminals 34a and 34f provided at the base of the protection frame 30, to prevent short - circuiting.

[0017] The wire strip tag 40 with such a configuration has a property of being freely deformable, or flexibility, and can also intervene in a narrow gap. Therefore, even when the path for moving the wire strip tag 40 to the cutting location of the cut cable 60 after inserting the end of the cut cable 60 into the wire strip tag 40 is narrow, it is possible to move the wire strip tag 40 while securing a surrounding space (the surrounding space itself can deform).

[0018] The protection frame 30 is an element for fixing the wire strip tag 40 to secure a surrounding space (a surrounding space with a stable form), inserting the cut cable 60 inserted into the wire strip tag 40 into the movable range of the cutting blade 22 that constitutes the electric cutter 20, and preventing other cables 62 from intervening. The protection frame 30 includes a pair of rigid fixing arms 32 made of non - conductive members such as resin or FRP (fiber - reinforced plastic). Although the specific shape and size of the fixing arm 32 are not limited, in the form shown in FIGS. 1 to 3, it is formed in a spade shape with notch portions provided on the tip side of the pair of fixing arms 32, so that the entire protection frame 30 has a horseshoe shape (C - shape).

[0019] The fixing arm 32 is provided with a number of fixed terminals 34 (34a - 34f) corresponding to the connection terminals 44 (44a - 44f) provided on the wire strip tag 40. Each fixed terminal 34 is configured to play a role as a so - called switch to achieve electrical continuity between adjacent conductors 42 that constitute the wire strip tag 40 when the connection terminal 44 is connected.

[0020] As an example of the specific configurations of the fixed terminal 34 and the connection terminal 44, those shown in FIGS. 4(A) and 4(B) can be cited. Note that in the drawing, FIG. 4(A) shows the state before connecting the connection terminal 44(44e) and the fixed terminal 34(34e), and FIG. 4(B) shows the state after connecting the connection terminal 44 and the fixed terminal 34.

[0021] The fixed terminal 34 (for example, the fixed terminal 34e) is provided with a pair of intervening portions 35 and a conduction portion 36 that connects between the paired intervening portions 35. Also, the connection terminal 44 (for example, the connection terminal 44e) is provided with a pair of claws 45 that intervene in the intervening portion 35 of the fixed terminal 34e. A conductor 42(42d1, 42e1) is interposed in each claw 45, and at least the tip thereof is configured to be exposed outside the claw 45. According to the fixed terminal 34e and the connection terminal 44e having such a configuration, by connecting the claws 45 of the connection terminal 44e to intervene in the intervening portion 35 of the fixed terminal 34e, the conductors 42d1, 42e1 interposed in the claw 35 contact the conduction portion 36 provided in the fixed terminal 34e, and conduction between the paired claws 45 is achieved.

[0022] Note that it is advisable to clarify the correspondence relationship between the connecting terminals by the external shape, number, etc. of each connection terminal 44 and the fixed terminal 34. With such a configuration, even if there are a plurality of connection terminals 44 and fixed terminals 34, it becomes easy to connect the corresponding terminals, and by connecting all the terminals, the surrounding space of the wire tag 40 can be expanded, and it becomes possible to prevent the intervention of other cables 62. Here, the protective frame 30 may be configured to be directly fixed to the tool body 24, but may also be configured to be fixed to the tool body 24 via a fixing base such as the mounting joint 48.

[0023] The power supply joint 50 is an element for controlling the power supply to the electric cutter 20. Specifically, it is an element for a configuration that enables power supply to the electric cutter 20 when the wire tag 40 is fixed to the protective frame 30. For this reason, the power supply joint 50 is placed between the tool body of the electric cutter 20 and the battery 26, and constitutes a current bypass path (power supply circuit). Specifically, it is equipped with connection terminals 50a to 50d corresponding to the positive terminal 26a and negative terminal 26b of the battery 26, and the positive terminal 24b and negative terminal 24c of the tool body 24, and a power supply path (preferably a power supply path connecting the positive terminals 26a and 24b) is routed to the base of the protective frame 30, connecting at least one of the connection terminals 50a and 50b corresponding to the positive terminals 26a and 24b, and the connection terminals 50c and 50d corresponding to the negative terminals 26b and 24c. The power supply path routed to the protective frame 30 is connected to fixed terminals 34a and 34f provided at the base of the protective frame 30. With this configuration, fixing the wire tag 40 to the protective frame 30 creates an electrical bypass path connecting fixed terminals 34a and 34f, enabling current to flow between positive terminal 26a and positive terminal 24b. This allows power to be supplied from the battery 26 to the tool body 24.

[0024] [Effects / Effects] Next, the method of using the accidental cutting prevention device configured as described above will be explained. First, the wire tag 40 is removed from the protective frame 30, and the cable to be cut 60 is passed through the space surrounding the wire tag 40 from the end of the cable 60 (S10). After passing the cable to be cut 60 through the wire tag 40, the wire tag 40 is moved to the cutting position of the cable 60. Since the wire tag 40 is a string-like member that is freely deformable or flexible, even if there is a narrow space between the end of the cable to be cut 60 and the cutting position, or a place where the gap with other cables 62 cannot be widened, the wire tag 40 can be deformed or bent to allow it to pass through those gaps (S20).

[0025] After moving the wire tag 40 to the cutting position, the wire tag 40 is fixed to the protective frame 30. Fixing the wire tag 40 to the protective frame 30 is done by connecting the predetermined connection terminal 44 and fixing terminal 34, respectively, which expands the enclosed space of the wire tag 40 to match the shape of the protective frame 30, preventing cables 62 other than the cable to be cut 60 from interfering with the movable range of the cutting blade 22. Furthermore, by fixing the wire tag 40 to the protective frame 30, a power supply path (bypass path) is connected, and power is supplied from the battery 26 to the tool body 24 (S30).

[0026] With the wire tag 40 attached to the protective frame 30, the cable to be cut 60, which has been inserted into the wire tag 40, is brought into contact with the cutting blade (between the pair of opposing blades 22a and 22b that make up the cutting blade 22) (S40). Then, the trigger 24a of the tool body 24 is operated to activate the cutting blade 22 and cut the cable to be cut (S50).

[0027] By cutting the cable 60 in this manner, the accidental cutting prevention device 10 can be constructed without modifying the existing electric cutter 20 itself. Furthermore, despite its simple configuration, the clarity of the cable 60 to be cut can be ensured. In addition, it is possible to prevent cables other than the cable 60 to be cut from accidentally interfering with the cutting area of ​​the cutting blade 22. Therefore, accidental cutting of cables 62 can be effectively prevented. Moreover, because the wire tag 40 is freely deformable or flexible, it can be used even in places with narrow gaps when moving along the cable 60 to be cut.

[0028] In the above embodiment, a conductor 42 is provided on the wire tag 40, and it was stated that power is supplied between the battery 26 and the tool body 24 by fixing the wire tag 40 to the protective frame 30. However, in the present invention, it is sufficient that power is supplied between the battery 26 and the tool body 24 by fixing the wire tag 40 to the protective frame 30. For this reason, the wire tag 40 may be an element that transmits some kind of signal (for example, light or magnetic force). In such a case, the wire tag 40 will play the role of a trigger for a circuit that supplies power between the battery 26 and the tool body 24 via the power supply joint 50. [Explanation of symbols]

[0029] 10………Anti-cutting device, 20………Electric cutter, 22……Cutting blade, 22a,22b………Opposite blades, 24………Tool body, 24a………Trigger, 24b………Positive terminal, 24c………Negative terminal, 26………Battery, 26a………Positive terminal, 26b………Negative terminal, 30………Protective frame, 32………Fixing arm, 34(34a-34f)………Fixing terminal, 35………Intervention part, 36………Conductive part, 40………Wire tag, 42(42a-42e)………Conductor, 44(44a-44f)………Connecting terminal, 45…Claw, 46…Insulating material, 48…Mounting joint, 50…Electrified joint, 60…Cable to be cut, 62…Cable.

Claims

1. Electric cutters for cutting communication and power cables, A linear tag is provided which a plurality of connection terminals are arranged spaced apart from each other, and a conductor is placed between adjacent connection terminals, forming an enclosed space through which a communication / power cable to be cut is inserted. The device comprises a fixing arm having multiple fixing terminals corresponding to the aforementioned connection terminals, which, when the connection terminals are connected to the fixing terminals, fix the wire tag and secure a surrounding space of a predetermined shape, while also ensuring conductivity of the conductor; and a protective frame having a notch that allows a communication / power cable inserted through the wire tag to enter the movable range of the cutting blade constituting the electric cutter. The wire tag also serves as a trigger for the power supply circuit, and the device is configured such that power is supplied to the electric cutter by fixing the wire tag to the protective frame.

2. A power supply joint is placed between the tool body that constitutes the electric cutter and the battery attached to the electric cutter, forming a bypass path that prevents direct power supply from the battery to the tool body. The accidental cutting prevention device according to claim 1, characterized in that the energized joint and the protective frame are electrically connected.

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