JP2001340023A - Electrically-powered high twig shear - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electrically-powered high twig shears capable of easily and instantaneously doing and changing the opening and closing operations of its cutting part with only one finger even in the midst of the operations, through such steps as to make a motor rotate clockwise only by finger-control using one hand gripping a holding part to close the cutting part of the shears, and moreover, make the motor rotate counterclockwise to open the cutting part only through letting the finger go off the holding part, and then turn the power off down when the cutting part is completely closed. SOLUTION: This electrically-powered high twig shear has the following construction: an electrically-powered motor 6, a speed reducer 7 for the motor 6, limit switches 18 and 19, and a changeover switch 21 which works so as to rotate the motor clockwise through a one-way finger control and on the other hand to rotate the motor counterclockwise through a finger-off operation because springy force causes a reversely returning action, are internally installed in a case 2 set on the side within reach; a stationary blade 15 of a cutting part 14 of the shears is fixed on the tip of a pipe 3 projecting from the front end of the case 2; the arm 16a of a mobile blade 16 of the cutting part 14 and the tip of a connecting member 10 threaded through the pipe 3 are connected with each other; and a screw shaft 8 projecting forward from the speed reducer 7 and the rear part of the connecting member 10 are screwed with each other.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric high-pruning scissors used for cutting a tree branch or the like at a height that cannot be reached. The present invention relates to a motor-operated high-pruning scissors in which the scissor portion is opened by simply closing the scissor portion and releasing the finger that has been pressed, and the power is turned off when the scissor portion is fully opened.

[0002]

2. Description of the Related Art Conventionally, many types of high branch cutting scissors have been known, and recently, easy-to-use electric high branch cutting scissors in which the power of cutting branches is left to electric power has been developed. Has reached.

[0003] One example is an electric high-rise cutting tool described in Japanese Utility Model Laid-Open No. 1-69475. In this electric pruning scissors, the opening and closing operation of the cutting blade of the cutting mechanism provided at the tip of the pipe is performed by operating a motor by operating a switch on the hand side to advance and retreat a connecting rod provided in the pipe. It has a structure in which the reciprocation of the rod is controlled by bringing a projecting body interlocking with the connecting rod into contact with two limit switches.

[0004] In addition, there is an electric pruning scissor disclosed in Japanese Patent Application Laid-Open No. 10-66446 as a recent known technique. The electric pruning scissors include a scissor body having an electric motor and a driving mechanism and having a holding portion provided with an operation switch of the electric motor, a pipe provided at a front portion of the scissor body, and the fixed blade. A movable blade that cuts the object to be cut, and a reverse rotation circuit that reverses the electric motor when the movable blade bites into the object to be cut is provided in the scissor body to release the biting state of the movable blade. It has a structure to make it.

[0005]

However, in the former electric high-altitude cutting device, the switching between the normal rotation and the reverse rotation of the motor is performed in response to the detection signals from the two front and rear limit switches. If the cutting blade does not reach the completely closed position, the motor is reversed and does not switch to the operation of opening the cutting blade. For this reason, for example, when the cutting blade bites into the branch while cutting a thick tree branch, it becomes difficult for the operator to open the cutting blade and separate from the branch. Such a situation not only causes a large decrease in work efficiency, but also overloads the motor, causing a disadvantage that the life of the cutting tool is adversely affected.

[0006] On the other hand, in the latter electric pruning scissors, when the movable blade bites deeply into the branch and gets caught, the fingertip of one hand is released from the trigger to stop the motor, and then the other hand is used. By operating the reversing switch with your finger and reversing the motor to open the movable blade, the movable blade can be released from the branch, but this operation is not possible for workers holding this machine with both hands. There was an inconvenience that could not be done instantly.

It is important to note that both the former and the latter, for example, when they notice that they are trying to cut wires, wires, wrong branches or even others' fingers that should not be cut during work However, it was not possible to open the cutting blade (movable blade) instantaneously due to the judgment of the sharpness, which could lead to an irreparable situation.

Further, since it is difficult to repeatedly open and close the cutting blade (movable blade) instantaneously, for example, when cutting a thick branch, the cutting operation is performed while shifting the cutting opening little by little in the direction around the branch. Not suitable for

The inventor of the present invention has found that such a problem greatly reduces the workability, work efficiency and safety of the high branch cutting work, and has started to develop a new high branch cutting scissors which solves these problems. As a result of diligent studies, the inventors finally invented the high-pruning scissors according to the present invention and completed a prototype.

[0010] The present invention completed through such circumstances,
By simply pushing and releasing one finger of one hand holding the base holding part, the scissors part can be opened and closed, and the power can be turned on and off. It can be done instantaneously and freely in the middle, for example, when you notice that you are trying to cut a wire or electric wire that is not to be cut, a wrong branch, or even another person's finger by mistake, a momentary reflex nerve When the finger that has been pressed is released due to the work, the scissors that were about to close can be instantaneously opened, preventing the irreparable situation, and cutting the thick branches of the tree. Even if the movable blade stops deeply into the tree branch while it is moving and the movable blade stops without cutting the hard branch of the tree, the scissors can be easily separated from the branch. Easy-to-use and safe An object of the present invention is to provide a formula high pruning scissors.

[0011]

SUMMARY OF THE INVENTION The high branch cutting scissors according to the present invention proposed to attain the above object have an electric motor, a reduction gear for the motor, a power switch of the motor and a finger. And a changeover switch for reversing the motor by returning to the opposite direction by a spring force when the finger is released by rotating the motor in the forward direction by a pushing operation of the motor. The fixed blade that constitutes one of the parts is fixed, the arm of the movable blade that constitutes the other of the scissors part is connected to the tip of the connecting member inserted into the pipe, and forward from the speed reducer. When the protruding screw shaft and the rear part of the connecting member are screwed together and the changeover switch is pressed, the screw shaft rotates forward,
Along with this, the connecting member retreats, the movable blade closes, and when the pressed finger is released, the screw shaft is reversed, and the connecting member advances along with this to open the movable blade. It is characterized by having done.

The high-pruning scissors according to the present invention has a long shape in which the case and the scissor portion are connected by a long pipe and has a total length of 1.5 to several meters, and the holding portion on the near side is held by one hand. In a posture of grasping and holding the handle located on the other hand with the other hand, the scissor portion is opened and closed by a switch operation with the index finger of the hand holding the holding portion on the near side, and a high tree is cut.

The most distinctive feature of the high branch cutting scissors according to the present invention is that the high branch cutting scissors are connected to an electric circuit for rotating the motor in the forward direction by pressing the changeover switch with the index finger of one hand holding the high branch cutting scissors. The movable blade of the scissors part is closed, and the switch is returned to the original position by the urging force of the spring and connected to the electric circuit that reverses the motor just by releasing the finger that was pushing, the movable blade is opened, That is, the operation can be instantaneously switched by a very simple operation of one finger and even during opening and closing.

In this respect, the above-mentioned Japanese Patent Application Laid-Open No. H10-6
The electric pruning scissors described in No. 6446 discloses that a switch for reversing the rotation direction of the motor is separately provided, and the movable blade cannot be operated in the opening direction unless the switch is operated.
In contrast to the need for troublesome operation and the inability to respond instantaneously, the electric high-pruning scissors of the present invention are superior in the operability and workability of the switch in each stage.

The changeover switch used in the electric high-pruning scissors according to the present invention is a switch for switching the direction in which current flows, and in consideration of operability, a push button which switches for each movement in the pressing direction and the returning direction. Although it is optimal to use a changeover switch of a system, a changeover switch of a seesaw system may be used. In addition, a double function type changeover switch that repeats normal / reverse connection every time a pressing operation is performed may be used.

Furthermore, when the changeover switch and the trigger are used in combination, the finger operation is extremely improved. In addition, what used the large seesaw switch does not need to have a trigger. The trigger is supported by the case so as to be able to move forward and backward, and has a size appropriate for operation with the fingertip.After pushing this to the hand side and then releasing the fingertip, the spring force is used to return to the original position. Being energized. As an alternative to this urging force, a device utilizing the return force of the operating portion of the changeover switch may be used. This changeover switch is housed inside the case with the operating part at the tip protruding,
In consideration of ease of use, a slight play gap is provided between the distal end of the operating portion and the rear end of the trigger.

The electric high-pruning scissors according to the present invention uses an AC power supply as a power supply, but may use a combination of an AC power supply and a battery. Incidentally, the motor used in correspondence with this combination is an AC motor or a DC motor combined with a diode.

A reduction gear connected to the drive shaft of the motor is connected to the front surface of the motor, and the number of rotations is 1/10 to 1/30 by a reduction gear set housed in the connection.
And output from the screw shaft, which is the output shaft of the reduction gear.

In the present invention, the base end of a metal rod-like connecting member that is strong and does not bend (bend) and is thin to some extent is inserted through a pipe protruding forward from the front end of the proximal case of the machine. When the screw cylinder is screwed and fixed in the fixed cylinder, the screw shaft is screwed into the screw cylinder, and the screw shaft is rotated forward together with the drive shaft of the motor. When the screw shaft is reversed together with the drive shaft of the motor, the connecting member moves forward to open the movable blade. In addition, the present invention includes a configuration in which the entire connecting member is formed of a small-diameter pipe, and a screw cylinder is screwed and fixed in a base end of the pipe so that a screw shaft is screwed.

The driving of the motor is stopped by detecting the advance / retreat position of the connecting member. Specifically, the control is performed by operating a control switch including two front and rear micro switches by a protrusion at the rear end of the operation member which is protruded and supported rearward from the rear portion of the connection member. Each of the two micro switches is a power switch for shutting off a drive circuit of the motor, and a micro switch located at the rear is operated at a retracted position of the connecting member when the movable blade is completely closed, and a micro switch at the front is operated. The switch operates in the advanced position of the connecting member when the movable blade is fully opened.

The scissors portion of the high-pruning scissors according to the present invention is a pair of scissors in which a fixed blade having an arcuate blade and a movable blade are pivotally connected. The base of the blade is fixed, and the distal end of the connecting member described above is pivotally attached to the distal end of the arm of the movable blade so that the movable blade opens and closes as the connecting member advances and retreats.

It is to be noted that a protective portion integrally formed with the case is provided at a peripheral portion where the finger operation of the trigger is not hindered.
The scissors are prevented from being inadvertently activated when a branch or the like accidentally hits a trigger or a finger operating this trigger during work. It should be noted that a protective frame material may be provided around the trigger instead of the protective portion.

As a result of this construction, the trigger is pressed with one finger on the front side while holding the holding part formed on the case on the hand side with one hand and holding the handle in front of the case with the other hand. It is possible to close and open the scissors part with an extremely simple operation of releasing the finger from the trigger, and its responsiveness is extremely good. The opening of the part and the switching of the scissor part can be performed instantaneously even during the opening and closing of the scissor part, so that not only the work of cutting the high branch of the tree but also the scissor part can be Even if you try to cut a wire, wire, wrong branch, or even another person's finger that should not be cut when you bite and stop, an unexpected situation may occur due to the instantaneous finger movement associated with the action of reflexes. Can be prevented.

[0024]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The purpose and structure of the present invention are as described above, and the specific structure of the electric high-pruning scissors according to the present invention will be described in detail with reference to the embodiments shown in the accompanying drawings. .

As shown in FIG. 1, the electric high-pruning scissors according to the present embodiment (hereinafter referred to as high-pruning scissors of the present embodiment).
Reference numeral 1 denotes a holding portion 4 for holding a one-handed holding portion 4 by projecting a rear portion of a resin-made case 2 on the near side diagonally rearward in an external view, and extending forward from a front end of the case 2. A metal pipe 3 having a shape is projected, and the pipe 3
A handle 2 for attaching a scissor portion 14 to the tip of the pipe 2 and holding the scissor portion 14 with the other hand in the middle of the pipe 3 near the case 2
4 and a holding portion 4 at the rear of the case 2.
An opening 2a large enough to allow a forefinger to be inserted and operated in the front-rear direction is formed at an obliquely upper front portion of the opening 2a.
The trigger 5 supported by pins is exposed at the rear of the inside of the case 2, and the power cord 50 extends to the rear end of the case 2.

As shown in FIG. 2A, a motor 6 and a speed reducer 7 mounted on the front surface of the motor 6 are housed substantially at the center of the case 2. Although not shown, a reduction gear, which is a combination of several spur gears, is assembled in the reduction gear 7, and the rotation of the drive shaft of the motor 6 rushed into the gear 7 is reduced to reduce the rotation of the drive shaft. The output is made from a screw shaft 8 protruding forward.

At the front end of the pipe 3 projecting from the front end of the case 2, as shown in FIGS. 2B and 3, the base of the fixed blade 15 constituting one of the scissor portions 14 is formed. The fixed blade 15 is integrally attached to the fixed blade 15 by supporting a movable blade 16 constituting the other of the scissor portion 14 with a pin. The cutting edges of both blades 15 and 16 are formed in an arc shape in order to make it easier to cut a tree branch.

In each of FIGS. 2 and 3, a connecting member 10 made of a thin metal bar which does not bend at the top is inserted into the pipe 3. A front end of the connecting member 10 is pivotally attached to an end of the arm 16a of the movable blade 16 via an operating member 28, and a rear end of the connecting member 10 has a short cylindrical shape in which an internal thread is engraved. A screw cylinder 12 is screwed and fixed to a rear portion of the cylindrical body 10a, and the output shaft 8 is fixed to the screw cylinder 12.
The connecting member 10 is advanced and retracted by the reversal and forward rotation of the screw shaft 8 so that the movable blade 16 can be opened and closed.

As shown in FIG. 2A, microswitches 18 and 19 are provided at two front and rear positions below the motor 6 in the case 2 with their operation portions 18a and 19a facing upward. . These two micro switches 18 and 19 are power switches for shutting off the drive circuit of the motor 6, and the operation of the micro switches 18 and 19 is as follows.
The operation is performed by abutting a projection 20a formed by projecting further rearward from the rear end with the advance / retreat of the operating member 20 that protrudes rearward from the rear of the cylindrical body 10a.

The forward and reverse rotations of the motor 6 are performed by a changeover switch 21 shown in FIG. 2A and FIG. The changeover switch 21 is mounted inside the case 2 with an operating portion 21a protruding at a rear portion within an opening 2a formed at the rear side portion of the case 2, and the operating member 21 is provided within the opening 2a. The trigger 5 is provided at a forward position of the portion 21a where a slight play gap is provided. The trigger 5 has its lower end pivotally supported in the case 2. When the finger 5 is inserted into the opening 2b and the trigger 5 is pressed, the operating portion 21a of the changeover switch 21 retreats. When a finger is released from the trigger 5, the operation unit 21 a of the changeover switch 21 is connected to a circuit for rotating the motor 6 forward.
Is configured to return to the original position and to be connected to a circuit for reversing the motor 6.

In order to prevent a dangerous situation in which a branch or a finger accidentally hits the trigger 5 during operation or the like and malfunctions, the peripheral portion of the trigger 5 facing downward from the front is used as the case 2. The opening 2b is formed so as to be surrounded by a part of the opening 2b.

FIG. 5 shows the changeover switch 21 and its connection circuit. As shown in FIG. 5, one contact of the changeover switch 21 is connected to the right-hand forward rotation circuit portion of the connection circuit 40, and The contact is connected to the left inversion circuit portion, and diodes D1 and D2 whose current flows in opposite directions are connected to the respective circuits. Therefore, in the state of FIG. 5 in which the operating portion 21a of the changeover switch 21 is in the state before the pressing operation and in the return position, the operating portion 21a is connected to the left inverting circuit portion in which the current flows in the arrow (A) direction. . From this state, the operating portion 21 of the changeover switch 21
When a is pressed, the operating portion 21a is connected to the right-hand forward rotation circuit portion where the current flows in the direction of the arrow (a). Thus, the motor (6) can be easily operated only by the finger operation of the changeover switch 21.
Can change the rotation direction.

Next, referring to FIGS. 6A and 6B, a description will be given of the movement of the connecting member 10 and the detection of the input / output of the power supply accompanying the driving of the motor 6. FIG.

FIG. 6A shows the changeover switch (2).
1) shows a state in which the pressing operation is not performed. In this state, the front portion of the output shaft 8 is screwed shallowly into the screw cylinder 12 in the cylindrical body 10a, and the connecting member 10 is moved forward. In this position, the projection 20a of the operating member 20 pushes down the operating portion 18a of the front microswitch 18 downward, and cuts off the power supply circuit when the movable blade (16) is completely opened. Thus, the drive of the motor 6 is stopped.

When the changeover switch (21) is pressed in this state, the motor 6 is turned off as shown in FIG.
The drive shaft rotates forward and the output shaft 8 rotates forward, and the cylindrical body 10a
The connecting member 10 is pulled in the hand direction together with the cylindrical body 10a while penetrating deeply into the inside. At this position, the protrusion 20a of the operating member 20 pushes down the operating portion 19a of the micro switch 19 at the rear, and the movable blade In the state where (16) is completely closed, the power supply circuit is shut off to stop driving the motor 6.

That is, FIG. 6A shows a state in which no finger operation is performed. In this state, the movable blade (16) is completely opened, and FIG. Thus, the movable blade (16) is completely closed. And
When the finger operation is stopped, the operation returns to the position shown in FIG.

[0037]

According to the electric scissors scissors according to the present invention described above, the scissors can be closed only by operating the finger of one hand holding the holding portion, and the finger is released. Just open the scissors and turn off the power,
The opening and closing operation of the scissors can be performed with a very simple operation of one finger.

In addition, since the opening and closing of the scissors can be freely and instantaneously switched even during the opening and closing of the scissors, for example, wires that must not be cut, electric wires, wrong branches, fingers of others, etc. When you notice that you are trying to cut it by mistake, you can instantly open the scissors by finger operation by the action of the reflex nerve, so that it can be prevented from becoming a dangerous situation. It was.

Further, for example, even when the scissors portion is cut deeply into a tree branch while cutting a thick branch of a tree, and the movable blade stops without cutting a hard branch of a tree,
The scissors could be easily opened and separated from the branches. As a result, the pruning operation using the high pruning scissors can be performed efficiently.

Furthermore, by surrounding a peripheral portion of the case which does not hinder the finger operation of the trigger with a part of the case, or fixing the protective frame material to the case, a branch or the like may be inadvertently made during operation. The scissors part is inadvertently activated when hitting the trigger, and it will not cause a dangerous situation,
The safety was dramatically improved.

[Brief description of the drawings]

FIG. 1 is a front view showing high-pruning scissors according to one embodiment of the present invention.

FIG. 2A is a front sectional view showing a base of the high-pruning scissors according to one embodiment of the present invention. (B) is a partial front view showing the tip of the high branch cutting scissors.

FIG. 3A is a plan sectional view showing a mounting structure of a scissor portion of the high branch cutting scissors. (B) is a front view similarly.
(C) The figure is also a right side view.

FIG. 4 is a diagram showing peripheral portions of a trigger and a changeover switch.

FIG. 5 is a diagram showing a changeover switch and a part of a connection circuit thereof;

FIG. 6A is a diagram showing movement of a connecting member accompanying driving of a motor and detection of input / output of a power supply. FIG. 4B is a diagram showing movement of the connecting member and detection of input / output of a power supply accompanying driving of the motor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Electric high branch cutting scissors 2 Case 3 Pipe 5 Trigger 6 Electric motor 7 Reduction gear 8 Screw shaft 10 Connecting member 10a Cylindrical body 14 Scissors part 15 Fixed blade 16 Movable blade 16a Arm 18, 19 Micro switch 21 Changeover switch 21a Operating part 24 handle

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification code FI Theme coat ゛ (Reference) A01G 3/03 H

Claims (2)

[Claims] An electric motor, a speed reducer for the motor, a power switch of the motor, a forward operation of the motor and a return operation in the opposite direction due to a spring force when the finger is released. A changeover switch for reversing the motor, a fixed blade forming one of the scissor portions fixed to a tip of a pipe protruding from the front end of the case, and an arm of a movable blade forming the other of the scissor portion And connecting the tip of the connecting member inserted into the pipe, screwing the screw shaft protruding forward from the reduction gear and the rear of the connecting member, and pressing the changeover switch,
When the screw shaft rotates forward, the connecting member retreats along with this, the movable blade closes, and when the finger pressed is released, the screw shaft reverses, and the connecting member moves forward with this. Motor-driven high-pruning scissors, wherein the movable blade is opened. 2. A switch which can be operated by finger operation of a trigger provided on a holding portion formed in a case on the hand side or in a vicinity thereof, and a peripheral portion which does not hinder finger operation of the trigger. The electric high-pruning scissors according to claim 1, wherein the portion is surrounded by a part of the case, or a protective frame member is fixed to the case.