Indirect live-line tool chainsaw

Abstract

To provide an indirect live-line tool chainsaw that can reduce the risk of electric shock and prevent fatigue.SOLUTION: An indirect live-line tool chainsaw 1 is attached to the tip 50a of an indirect live-line tool 50 and includes a chainsaw 2 with a built-in motor for rotating the saw chain, drive means 3 for driving the motor, and an attachment member 4 for attaching the chainsaw 2 to the tip 50a, the drive means 3 is an existing hydraulic system 60 that controls the operation of a bucket 70 used for working at heights, and the motor is a hydraulic motor, and hydraulic oil is supplied via a hydraulic hose 62 provided in the hydraulic system 60.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a chainsaw for cutting down plants, and more particularly to an indirect live-line tool chainsaw that is attached to the tip of an indirect live-line tool and used for work at height near electric power lines. [Background technology]

[0002] Conventionally, when cutting trees near live power lines, workers wear protective gear (hot-wire jacket, high-voltage rubber gloves), get within close range, and work by directly holding the cutting tools. However, while there are cases where it is possible to perform work during blackouts, there are also cases where it is unavoidable and blackouts are not possible. In these cases, workers will be cutting trees while approaching live power lines, which increases the risk of electric shock and creates a dangerous situation. In order to solve this problem, a technique has been developed in recent years in which a tree-cutting tool is attached to the tip of an electrically insulating operating rod, and an invention relating to this technique has already been disclosed.

[0003] Patent Document 1 discloses an invention entitled "Branch Pruning Saw" that relates to a branch pruning saw fixed to the tip of a long operating rod. The invention disclosed in Patent Document 1 is characterized by comprising: a single-edged saw body extending in the direction in which the operating rod extends; a band-shaped oscillating plate rotatably connected to the tip of the operating rod; a clasp plate rotatably connected to the tip of the oscillating plate; a first spring member that applies a force to rotate the oscillating plate so that the tip of the oscillating plate moves away from the saw body; and a second spring member that applies a force to close the oscillating plate and the clasp plate so that they overlap. In the invention having such characteristics, the saw body is attached to the tip of the electrically insulating operating rod, thereby reducing the risk of electric shock. Furthermore, when the saw body is reciprocated while the piercing blade on the clamp plate holds the branch, the clamp plate follows the branch to prevent the saw body from separating from the branch, making it difficult for the saw body to come off the cut end of the branch.This makes it easy to cut the branch, reducing the effort required by the operator. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2012-170450 Summary of the Invention [Problem to be solved by the invention]

[0005] However, although the invention disclosed in Patent Document 1 is a manually operated type with a simple configuration, it is thought that the operator will become fatigued when working for a long period of time due to the action of reciprocating the saw body.

[0006] The present invention has been made in response to the above-mentioned conventional circumstances, and has as its object to provide a chainsaw for an indirect live-line tool that can reduce the risk of electric shock and prevent fatigue. [Means for solving the problem]

[0007] In order to achieve the above object, the first invention is characterized by comprising a chainsaw attached to the tip of an indirect live-line tool and having a built-in motor for rotating the saw chain, a driving means for driving the motor, and an attachment member for attaching the chainsaw to the tip. In the invention having such a configuration, the indirect live-line tool used is a versatile tool that can be attached and detached to various types of tool tips, and the chain saw used has a general structure.

[0008] Furthermore, the motor may be, for example, a hydraulic motor or an electric motor, and the drive means in this case may be a hydraulic system that drives the hydraulic motor, or a battery or external power source that drives the electric motor. As an attachment member, for example, a chrysanthemum seat that allows a saw chain of a chainsaw to be attached and detached to an indirect live-line tool at a different angle is envisioned.

[0009] In the invention with the above configuration, the chainsaw is attached to the tip of the indirect live-line tool, so tree cutting can be done from a position some distance away from the power line. In addition, the saw chain of the chainsaw is operated by a motor and a drive means, rather than manually, so branches can be easily cut down.

[0010] The second invention is characterized in that, in the first invention, the drive means is an existing hydraulic system that controls the operation of a bucket used for work at height, and the motor is a hydraulic motor to which hydraulic oil is supplied via a hydraulic hose provided in the hydraulic system. In the invention having such a configuration, the existing hydraulic system is assumed to have a switch that allows the operator to control the supply of hydraulic oil at hand, installed inside the bucket that the operator sits in. Also, the hydraulic motor is connected to a hydraulic hose only when, for example, a chainsaw is used. In the invention having the above configuration, in addition to the effects of the first invention, when the worker connects the hydraulic hose to the hydraulic motor and then operates the switch to start the supply of hydraulic oil, the hydraulic motor is driven, the saw chain rotates, and felling becomes possible.

[0011] A third invention is characterized in that in the second invention, a holder is provided for holding the hydraulic hose along the indirect live-line tool. In the invention having such a configuration, the holder may be, for example, a clip that holds the hydraulic hose and the indirect hot-line tool together. In the invention having the above configuration, in addition to the effect of the second invention, the hydraulic hose is held along the indirect live-line tool by the holder, so that the hydraulic hose follows the movement of the indirect live-line tool.

[0012] The fourth invention is characterized in that, in the first invention, the motor is an electric motor that is supplied with power from a battery that is detachable from the chainsaw or from an external power source, and the operation of the electric motor is controlled via a hand switch that is placed at the operator's hand. In the invention configured as described above, when the operator operates the hand switch to supply power to the electric motor, the electric motor is driven, the saw chain rotates, and tree cutting becomes possible. [Effects of the Invention]

[0013] According to the first aspect of the present invention, it is possible to cut down trees from a position some distance away from the power lines, thereby reducing the risk of electric shock to the worker. In addition, because branches can be easily cut down, the time and effort required for cutting work can be reduced. Therefore, fatigue of the worker can be prevented even during long work periods.

[0014] According to the second invention, in addition to the effect of the first invention, the drive means is an existing hydraulic system, so there is no need to provide a new drive means, which reduces costs and promotes the adoption of the first invention. In addition, because the hydraulic motor is continuously supplied with working oil from the hydraulic system, the chainsaw can be operated stably even when work takes a long time.

[0015] According to the third invention, in addition to the effects of the second invention, the holding device allows the hydraulic hose to follow the movement of the indirect live-line tool, making it easier to handle the indirect live-line tool when the hydraulic hose is connected to the chainsaw.

[0016] According to the fourth invention, in addition to the effects of the first invention, the worker can start felling by operating the hand switch, making it extremely easy to start using the fourth invention. In addition, a configuration in which the electric motor is powered by a battery that can be attached or detached from the chainsaw eliminates the need for hydraulic hoses or power cords that plug into external sources, making indirect live-line tools even easier to handle. [Brief explanation of the drawings]

[0017] [Figure 1] 1 is a plan view showing the configuration of a chain saw for an indirect live-line tool according to an embodiment. [Figure 2]1A is an enlarged view of a chainsaw and a mounting member that constitute a chainsaw for an indirect live-line tool according to an embodiment, and FIG. 1B is a view taken in the direction of an arrow A in FIG. 1A. [Figure 3] 1A is a plan view of a holder constituting an indirect live-line tool chainsaw according to an embodiment, and FIG. 1B is a view showing the holder in use. [Figure 4] 1A is a plan view showing the appearance of a chainsaw for an indirect live-line tool according to a modified example of the embodiment, and FIG. 1B is a perspective view showing the appearance of a hand switch that controls the operation of the chainsaw for the indirect live-line tool. DETAILED DESCRIPTION OF THE INVENTION [Example]

[0018] A moving cable stand according to an embodiment of the present invention will be described in detail with reference to Figures 1 to 3. Figure 1 is a plan view showing the configuration of a chainsaw for indirect live-line tools according to the embodiment. As shown in Figure 1, the chainsaw 1 for an indirect live-line tool in this embodiment includes a chainsaw 2 attached to the tip 50a of the indirect live-line tool 50, a driving means 3, and an attachment member 4 for attaching the chainsaw 2 to the tip 50a. The indirect live-line tool 50 includes a main shaft 51 made of an insulating material, and is provided with a water-blocking flange 52 near the tip 50a and a safety limit flange 53 near the base end 50b.

[0019] Next, the configuration of the chainsaw 1 for indirect live-line tools will be described in order. First, the drive means 3 is an existing hydraulic system 60 that controls the operation of a bucket 70 used for work at height, and drives a hydraulic motor 2a (see Figure 2) built into the chainsaw 2. In detail, the hydraulic system 60 includes a hydraulic pump 61, a hydraulic hose 62 that supplies the hydraulic oil discharged by the hydraulic pump 61 to the hydraulic motor 2a, a connection port 63 that can connect the base end 62a of the hydraulic hose 62 to the hydraulic pump 61, and an operation panel 64 for controlling the movement of the bucket 70. Of the above, the connection port 63 and the operation panel 64 are disposed inside the bucket 70. In addition, the operation panel 64 is provided with a supply switch 65 that enables the operator to control the supply of hydraulic oil at their fingertips.

[0020] In addition, both the base end 62a and the tip end 62b connected to the hydraulic motor 2a of the hydraulic hose 62 are high-pressure couplers. A water leak flange 66 is provided midway along the hydraulic hose 62 near the tip end 62b, and a safety limit flange 67 is provided near the base end 62a.

[0021] Next, the configuration of the chainsaw and mounting members that make up the chainsaw for an indirect live-line tool according to the embodiment will be described with reference to Fig. 2. Fig. 2(a) is an enlarged view of the chainsaw and mounting members that make up the chainsaw for an indirect live-line tool according to the embodiment, and Fig. 2(b) is a view taken in the direction of arrow A in Fig. 2(a). Note that the components shown in Fig. 1 are given the same reference numerals in Fig. 2, and their description will be omitted. As shown in Figures 2(a) and 2(b), the chainsaw 2 includes a hydraulic motor 2a, a sprocket (not shown) driven by the hydraulic motor 2a, a saw chain 2b to which the rotational force of the hydraulic motor 2a is transmitted via the sprocket, a guide bar 2c around which the saw chain 2b is suspended, and a housing 2d that houses the hydraulic motor 2a, the sprocket, etc. Of these, hydraulic oil is supplied to the hydraulic motor 2 a via a hydraulic hose 62 provided in the hydraulic system 60 .

[0022] The mounting member 4 also includes an annular member 4a that grips the housing 2d of the chainsaw 2, a clamping member 4b that has a pair of parallel elongated members that can clamp the annular member 4a, and a first chrysanthemum seat 4c that is provided descending from the outer end of the clamping member 4b. Of these, the first chrysanthemum seat 4c is fixed by a mounting pin 54a to a second chrysanthemum seat 54 that is detachably attached to the tip 50a of the indirect live-line tool 50 (see FIG. 3). Therefore, the first chrysanthemum seat 4c and the second chrysanthemum seat 54 enable the chainsaw 2 to change the angle α formed between the longitudinal direction of the guide bar 2c and the longitudinal direction of the indirect live-line tool 50.

[0023] Next, a holder constituting a chainsaw for an indirect live-line tool will be described with reference to Fig. 3. Fig. 3(a) is a plan view of a holder constituting a chainsaw for an indirect live-line tool according to an embodiment, and Fig. 3(b) is a diagram showing the holder in use. Note that the same reference numerals are used in Fig. 3 for the components shown in Figs. 1 and 2, and their description will be omitted. As shown in FIG. 3, the chainsaw 1 for an indirect live-line tool includes a holder 5 that holds a hydraulic hose 62 along a main shaft 51 of an indirect live-line tool 50.

[0024] As shown in Figure 3(a), the holder 5 is a so-called clothespin-type clip, and includes a pair of clamping pieces 6, 6 having front ends 6a, 6a and rear ends 6b, 6b, a connecting shaft 7 connecting the clamping pieces 6, 6, and a torsion spring 8 wound around the connecting shaft 7 and biasing the front ends 6a, 6a in a direction that brings them closer together. The clamping pieces 6, 6 have large curved portions 9, 9 and small curved portions 10, 10 formed on opposing sides. The large curved portions 9, 9 clamp the main shaft 51 of the indirect live-line tool 50, and the small curved portions 10, 10 clamp the hydraulic hose 62.

[0025] 3(b), for example, the hydraulic hose 62 and the main shaft 51 can be clamped together by the holder 5 between the tip 50a and the deflector flange 52, and between the deflector flange 52 and the safety limit flange 53. This prevents the hydraulic hose 62 from becoming tangled in the main shaft 51 or from becoming excessively separated from the main shaft 51.

[0026] Next, the procedure for using the chainsaw 1 for indirect live-line tools will be described. First, the operator fixes the first chrysanthemum seat 4c of the mounting member 4 that holds the chainsaw 2 to the second chrysanthemum seat 54 attached to the tip 50a of the indirect live-line tool 50 using the mounting pin 54a. At this time, the operator can adjust the position of the first chrysanthemum seat 4c relative to the second chrysanthemum seat 54 so that it is at a desired angle α (see FIG. 2). Next, the operator connects the base end 62a and tip end 62b of the hydraulic hose 62 to the connection port 63 and hydraulic motor 2a, respectively, and then operates the supply switch 65 on the operation panel 64 to start the supply of hydraulic oil. This then drives the hydraulic motor 2a, causing the saw chain 2b to rotate, making it possible to cut trees. In this way, with the chainsaw 1 for indirect live-line tools, tree felling can be performed by the simple procedure of connecting the first antlered seat 4c and the hydraulic hose 62 to the second antlered seat 54 and the hydraulic motor 2a, etc., respectively.

[0027] Therefore, in the chainsaw 1 for indirect live-line tools having the above configuration, the chainsaw 2 is attached to the tip 50a of the indirect live-line tool 50 via the first chrysanthemum seat 4c or the like, so it is possible to leave a distance between the worker and the chainsaw 2. This allows the worker to cut trees from a position some distance away from the electric line. In addition, the saw chain 2b of the chainsaw 2 is operated by a hydraulic motor 2a and a hydraulic system 60, and is not a manual type, so that branches can be easily cut down.

[0028] Furthermore, in the chainsaw 1 for indirect live-line tools, the holder 5 prevents the hydraulic hose 62 from becoming tangled around the main shaft 51 or from moving excessively away from the main shaft 51, so that when the operator moves the indirect live-line tool 50, the hydraulic hose 62 follows the indirect live-line tool 50.

[0029] As explained above, the chainsaw for indirect live-line tools 1 allows for felling from a position some distance away from the power lines, reducing the risk of electric shock to the worker. Furthermore, because branches can be easily felled, the time and effort required for felling work can be reduced. Therefore, fatigue of the worker can be prevented even during long-term work. Furthermore, since chainsaws 2 equipped with hydraulic motors 2a are widely available on the market and are not difficult to obtain, the chainsaw 1 for indirect live-line tools can be easily manufactured.

[0030] Furthermore, according to the chainsaw for indirect live-line tools 1, there is no need to provide a new drive means because the drive means 3 is the existing hydraulic system 60. This reduces costs, which promotes its introduction. Furthermore, since work oil is continuously supplied to the hydraulic motor 2a from the hydraulic system 60 via the hydraulic hose 62, the chainsaw 2 can be operated stably even when work continues for a long period of time. In addition, the chainsaw for indirect live-line tools 1 allows for felling through simple procedures, allowing for quick preparation for felling work and cleanup afterwards.

[0031] Furthermore, according to the chainsaw 1 for indirect live-line tools, the holding device 5 allows the hydraulic hose to follow the movement of the indirect live-line tool 50, making it easier to handle the indirect live-line tool 50 when the hydraulic hose 62 is connected to the hydraulic motor 2a.

[0032] Furthermore, because the holder 5 is a so-called clothespin-type clip, it can be attached to and detached from the object with a single touch. Therefore, when the chainsaw 2 is not in use, the hydraulic hose 62 can be easily detached from the main shaft 51 of the indirect live-line tool 50, so that the indirect live-line tool 50 can be immediately used for work other than tree felling. Additionally, in the holder 5, the large curved portions 9, 9 clamp the main shaft 51 of the indirect live-line tool 50, and the small curved portions 10, 10 clamp the hydraulic hose 62, so that the clamped main shaft 51 and hydraulic hose 62 are difficult to separate. Therefore, work can be carried out without interruption.

[0033] Next, the configuration of a chainsaw for an indirect live-line tool according to a modified example of the embodiment will be described with reference to Fig. 4. Fig. 4(a) is a plan view showing the appearance of the chainsaw for an indirect live-line tool according to a modified example of the embodiment, and Fig. 4(b) is a perspective view showing the appearance of a hand switch that controls the operation of the chainsaw for an indirect live-line tool. Note that the components shown in Figs. 1 to 3 are given the same reference numerals in Fig. 4, and their description will be omitted. As shown in FIG. 4(a), a chainsaw 1A for an indirect live-line tool according to a modified example of the embodiment includes a chainsaw 11 instead of the chainsaw 2 of the chainsaw 1 for an indirect live-line tool.

[0034] The chainsaw 11 has an electric motor 11a built in instead of the hydraulic motor 2a built in the chainsaw 2. The electric motor 11a is supplied with power from a battery 12 that is detachably attached to the chainsaw 11. However, instead of the battery 12, the electric motor 11a may be supplied with power via a power cord from, for example, an external power source already installed in the aerial work platform vehicle.

[0035] The indirect live-line tool chainsaw 1A also has a switch 13 provided on its housing 14 for the operator to control the operation of the electric motor 11a. Furthermore, a control unit 15 for remotely operating the switch 13 is provided inside the housing 14.

[0036] In addition, as shown in FIG. 4(b), the chainsaw 1A for indirect live-line tools includes a hand switch 16 that is placed at the operator's hand. The hand switch 16 is battery-operated and includes a box-shaped housing 16a that houses a battery (not shown), an ON button 16b and an OFF button 16c that are arranged on one front surface of the housing 16a, and wireless communication means 16d that wirelessly transmits a signal generated when the operator presses either the ON button 16b or the OFF button 16c to the control unit 15. Other than this, the configuration of the chainsaw 1A for indirect live-line tools is the same as the configuration of the chainsaw 1 for indirect live-line tools according to the embodiment.

[0037] In the chainsaw 1A for indirect live-line tools configured as described above, the operator can operate either the switch 13 provided on the housing 14 of the chainsaw 11 or the hand switch 16 located at the operator's hand. This operation supplies power from the battery 12 to the electric motor 11a, driving the electric motor 11a to rotate the saw chain 2b and enable felling. Other than this, the operation of the chainsaw 1A for indirect live-line tools is the same as that of the chainsaw 1 for indirect live-line tools according to the embodiment.

[0038] With the chainsaw 1A for indirect live-line tools, the worker can start felling trees by operating the switch 13 or the hand switch 16, and since there is no need to go through the procedure of connecting the hydraulic hose 62 to the hydraulic motor 2a, etc., it is extremely easy to start using the chainsaw 1A for indirect live-line tools. Furthermore, like the chainsaw 2, the chainsaw 11 equipped with the electric motor 11a is not difficult to obtain, so the chainsaw 1A for indirect live-line tools can be easily manufactured.

[0039] Furthermore, the chainsaw 1A for indirect live-line tools does not require a hydraulic hose 62 or a power cord to be plugged into an external power source, making it even easier to handle the indirect live-line tool 50. Other effects of the chainsaw 1A for indirect live-line tools are the same as those of the chainsaw 1 for indirect live-line tools according to the embodiment.

[0040] The chainsaw for indirect live-line tools according to the present invention is not limited to the examples shown in the accompanying drawings. For example, a newly installed hydraulic system may be used as the driving means 3. Furthermore, when power is supplied to the electric motor 11a from an external power source via a power cord, a holder 5 may be used. [Industrial Applicability]

[0041] The present invention can be used as an indirect live-line tool chainsaw that is attached to the tip of an indirect live-line tool and used for work at height near power lines. [Explanation of symbols]

[0042] 1,1A... Chainsaw for indirect live-line tool 2,11... Chainsaw 2a... Hydraulic motor 2b... Saw chain 2c... Guide bar 2d,14... Housing 3... Driving means 4... Mounting member 4a... Annular member 4b... Clamping member 4c... First chrysanthemum seat 5... Holder 6... Clamping piece 6a... Front end 6b... Rear end 7... Connecting shaft 8... Torsion spring 9... Large curved portion 10... Small curved portion 11a... Electric motor 12... Battery 13... Switch 15... Control unit 16... Hand switch 16a... Housing 16b... On button 16c... Off button 16d... Wireless communication means 50... Indirect live-line tool 50a... Tip 50b... Base end 51... Main shaft 52,66... Water deflector 53,67... Safety limit flange 54... Second chrysanthemum seat 54a...Mounting pin 60...Hydraulic system 61...Hydraulic pump 62...Hydraulic hose 62a...Base end 62b...Tip 63...Connection port 64...Operation panel 65...Supply switch 70...Bucket

Claims

1. A chainsaw that is attached to the tip of the indirect live-line tool and has a built-in motor for rotating the saw chain; a driving means for driving the motor; A chainsaw for indirect live-line tools, comprising an attachment member for attaching the chainsaw to the tip.

2. the drive means is an existing hydraulic system that controls the operation of a bucket used for work at height, 2. The chain saw for an indirect live-line tool according to claim 1, wherein the motor is a hydraulic motor, and hydraulic oil is supplied to the motor through a hydraulic hose provided in the hydraulic system.

3. 3. The chain saw for an indirect live-line tool according to claim 2, further comprising a holder for holding the hydraulic hose along the indirect live-line tool.

4. The chainsaw for indirect live-line tools according to claim 1, characterized in that the motor is an electric motor, and power is supplied from a battery detachable from the chainsaw or an external power source, and the operation of the electric motor is controlled via a hand switch located at the operator's hand.

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