JP4650637B2 - Electric pruning scissors storage mechanism - Google Patents

Description

  The present invention relates to a storage mechanism for electric pruning scissors used for gardening or the like, and more particularly to a storage mechanism for electric pruning scissors that automatically turns off the power when stored in a storage case at the time of work interruption or after completion of the work.

  For pruning scissors used for landscaping work, etc., a power unit such as an electric motor is added to the scissors that are configured to open and close the movable blade relative to the fixed blade in order to increase the cutting power in operations such as branch cutting. There are electric pruning scissors.

  In the electric pruning scissors, the scissors that open and close the movable blade and the power unit that supplies power to the scissors are integrated. When the trigger (trigger) of the scissors is operated, the signal is sent to the power unit. A mechanism is known in which a movable blade is moved and operated in accordance with the amount of movement of a trigger to obtain a cutting force larger than that by human power.

  Patent Document 1 discloses electric pruning scissors that detect the position of a trigger with a magnetic sensor, pass a predetermined current through an electric motor based on the information, rotate a screw shaft, and open and close a movable blade connected to a nut. Are listed.

  Patent Document 2 describes electric pruning scissors that open and close the movable blade with an electric motor in order to detect the rotation angle of the trigger and the movable blade and match the latter with the former.

  However, these conventional electric pruning scissors all have a considerable weight because the scissor part and the power unit part are integrally formed, and when used for operations such as branch cutting, the branches to be cut are overhead. The electric pruning scissors must be lifted to a position higher than the shoulder, and the work is continuous, so that the degree of fatigue is high and the work efficiency is not increased.

  On the other hand, in order to reduce the weight of the main body scissors and reduce the fatigue level of pruning work such as pruning, and to improve work efficiency, the scissors and power unit are separated and connected with a control cable to trigger Electric pruning scissors have been developed that use a control cable to transmit the tensile force obtained by rotating the electric motor to the scissors using a control cable.

  Workers can reduce the degree of fatigue and improve work efficiency by attaching the power unit of this electric pruning scissors with a belt behind the waist and holding the lightweight scissors in their hands. it can.

When working with this power unit separation type electric pruning scissors, when the pruning operation is interrupted, it is inserted into a dedicated storage case with the scissors lowered to the waist. At that time, it is dangerous to leave the blade open, so the trigger is fully closed, the blade is closed, the operation power is turned off, and the blade is inserted into the storage case. The operation power is turned off for the purpose of power saving, noise prevention and accident prevention, and is also set in the work manual.
Japanese Patent No. 2735218 Japanese Patent No. 3537649

  However, since the power switch for the operation power supply is provided in the power unit section, each time the scissor section is stored in the storage case, the hand must be turned to the back of the waist to operate the changeover switch. It was. Moreover, during this operation, the trigger is closed and held in the operating state with the dominant hand, so when operating the changeover switch with the dominant hand, there is a risk of damaging the body or equipment with the scissors blade, When the changeover switch is operated with an unoccupied hand, both hands are blocked, and there is a risk that the balance of the body may be lost, so there is a problem in ensuring work safety at high places. Since the pruning operation is frequently interrupted, it has been desired to improve the storage operation.

  Even after the blade is closed, the trigger must be held until it is inserted into the storage case and the storage is completed and the power is turned off. In this respect, it is desired to facilitate the work.

  An object of the present invention is to solve the above problems and to provide an electric pruning scissor storage mechanism that can easily and safely store a scissor portion in a storage case when the pruning operation is interrupted or terminated.

  In order to solve the above-mentioned problem, the invention according to claim 1 includes a scissor portion including a blade that opens and closes and an operating means for operating the blade, and a power unit portion that stores a power source for supplying power to the scissor portion. In the electric pruning scissor storage mechanism provided with a storage case for storing the scissors, the scissors are provided with a power switch, and the storage case has a blade of the scissors closed. Switching means for switching the power switch to power off is provided at a position through which the power switch passes when housed in the case.

  According to a second aspect of the present invention, in the first aspect of the present invention, in the storage case, the switching means is disposed at a position where the operation means passes when stored in the case with the scissors blade open. In the foreground, an engaging portion is provided that engages with the operating means and moves the operating means to a position for closing the blade.

  As described above, according to the first aspect of the present invention, in the storage case of the scissor portion, the power switch is placed at a position where the power switch passes when the scissor portion blade is stored in the case with the blade closed. Since the switching means for switching the power off is provided, when the scissors are stored in the storage case with the blade closed by the operation means, the power switch is turned off by the switching means in the middle of the operation. Thus, since it is not necessary to use a hand to turn off the power, the scissors can be easily and safely stored in the storage case when the pruning operation is interrupted or terminated.

  According to the invention of claim 2, the storage case is engaged with the operation means at a position where the operation means passes when stored in the case with the blade of the scissor portion opened. Since the engaging part for moving the operating means to the position for closing the blade is provided, when the scissor part is stored in the storage case, the operating means is engaged with the engaging part and the opened blade is closed. Moreover, since the engaging portion is in front of the switching means, the power switch is turned off after the blade is closed, and the power is not turned off before the blade is closed, so that the blade is securely closed.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. 1 is a side view in which a part of the electric pruning scissors storage mechanism of the present embodiment is omitted, FIG. 2 is a side sectional view showing an internal mechanism of the electric pruning scissors, and FIG. 3 is a perspective view of the scissors. It is.

  In the above figure, the electric pruning scissors are obtained by separating a scissor portion 1 having a blade that opens and closes and an operating means for operating the blade, and a power unit portion that stores a power source for supplying power to the scissors portion. Thus, the scissors 1 and the power unit 2 are connected via a control cable 3. The scissors 1 is configured to be stored in the storage case A.

  The scissor portion 1 includes a body 4, a scissor 5, a trigger 6, and the like. A grip 4 a is formed on the body 4, and the scissors 5 are composed of a fixed blade 8 and a movable blade 9 and are provided at the front end of the body 4. The movable blade 9 is rotatably attached with a shaft 10 provided at the base of the fixed blade 8 as a fulcrum.

  The trigger 6 is an operating means that is rotatably disposed around a support shaft 11 provided at the front portion of the body 1. The trigger 6 is moved from the end position to the reference position (position in FIG. 2) by a torsion coil spring 12. It is configured to always return to the reference position when the finger is released from the pulled state (the state shown in FIG. 1). Further, a rotation angle detection sensor (not shown) is disposed in the vicinity of the trigger 6.

  Inside the grip 4a, a slider 13 that can move back and forth is disposed. The slider 13 is urged so as to always move forward by the compression spring 14. Further, the rear ends of the left and right links 15 are rotatably connected to the front end of the slider 13, and the front ends of these links 15 are rotatably connected to an arm 17 projecting downward from the movable blade 9. ing. The slider 13 passes through a spring retainer 20 at the rear end of the compression spring 14.

  Next, the power unit portion 2 is provided with a unit housing 21 provided with an electric motor 22 and a ball screw 23 driven by the electric motor 22, and the electric motor 22 is connected to the rear end of the unit housing 21. Further, the electric motor 22 is operatively connected to the screw shaft 24 of the ball screw 23 via the speed reduction mechanism 25. A nut member 26 is screwed onto the screw shaft 24. Further, parallel links 27 are attached to both sides of the nut member 26, and the front ends of these parallel links 27 are integrally coupled by a coupling portion 30. Therefore, when the electric motor 22 rotates, the rotation is decelerated by the speed reduction mechanism 25 and transmitted to the screw shaft 24 of the ball screw 23. When the screw shaft 24 rotates, the nut member 26 moves forward and backward along the screw shaft 24, At the same time, the link 27 translates, and the connecting portion 30 moves forward and backward.

  Further, the power unit 2 is provided with a control device (not shown) that sends a predetermined current to the electric motor 22 to rotate by the signal of the rotation angle detection sensor of the trigger 6. This control device always knows the rotational speed of the electric motor 22 and the positional relationship between the nut member 26 and the screw shaft 24 of the ball screw 23 and moves the movable blade 9 to an angular position corresponding to the rotational angle of the trigger 6. Accordingly, the current calculated from the signal of the angle detection sensor and the current position of the nut member 26 is sent to the electric motor 22 to adjust the position of the movable blade 9.

  Next, the control cable 3 for connecting the scissor portion 1 and the power unit portion 2 is a hollow outer cable 32 in which a steel wire inner cable 33 is movably inserted. Are fixed to the rear end portion of the body 4 of the scissor portion 1 and the fixing portions 34 and 35 of the front end portion of the unit housing 21, respectively. The front end of the inner cable 33 is pivotally attached to the rear end of the slider 13, and the rear end is fixed to the center of the front end coupling portion 30 of the parallel link 27.

  Next, the operation mode of the electric pruning scissors having the above configuration will be described.

  The initial position of the trigger 6 corresponds to the fully open position of the movable blade 9. First, the case where the movable blade 9 is closed from the fully opened position will be described.

  When actually cutting the branch, after the branch is sandwiched between the movable blade 9 and the fixed blade 8 in the fully open position, the trigger 6 is pulled in the direction of the arrow P with a finger and the electric motor is operated. The nut member 26 and the link 27 are rotated to the right in FIG. 2 and the link 15 of the scissors 1 is pulled through the control cable 3 and moved to the right, so that the movable blade 9 rotates in the closing direction. The branches are cut and closed.

  When the movable blade 9 is opened, when the trigger 6 is twisted and rotated in the direction of the arrow Q by the biasing force of the coil spring 12 after the finger pulling force is loosened from the fully closed position, the electric motor 22 is in the case of the above closing operation. Rotates in the opposite direction, the screw shaft 24 of the ball screw 23 rotates, the nut member 26 and the link move, and the link of the scissor portion 1 moves to the left side via the control cable 3. As a result, the movable blade 9 rotates in the opening direction.

  In either case of opening and closing, the movable blade 9 stops at an angular position corresponding to the rotation angle of the trigger 6.

  Next, the scissor portion 1 is stored in the storage case A. At the front end of the body 4, a rocker switch 41 is provided as a power switch at a position corresponding to the switch block 28 at the base of the fixed blade 8. The rocker switch 41 is swingable with an intermediate portion as a fulcrum, and projecting portions 42 and 43 at both ends are selectively projected and retracted to the outside.

  On the other hand, the storage case A is made of synthetic resin, and is formed so as to conform to the shape of the movable blade 9 of the scissors 1 closed as shown in FIG. In the vicinity of the opening on the inner surface of the storage case A, a convex portion 44 is formed as a switching means at a portion corresponding to the rocker switch 41. The convex portion 44 is formed at a position through which the rocker switch 41 always passes when stored in the storage case A with the blade of the scissor portion 1 closed. A trigger receiving portion 29 is formed on the opposite side of the convex portion 44.

  In the above configuration, when the scissors 1 are stored in the storage case A when the work is interrupted or after the work is finished, the trigger 6 is pulled to close the movable blade 9 as shown in FIGS. 4 (a) and 4 (b). The blade is fully closed, and the scissors 1 is inserted into the storage case A as it is. On the way, the rocker switch 41 of the scissor portion 1 engages with the convex portion 44 of the storage case A, so that the protruding portion 42 of the protruding portion of the rocker switch 41 is pushed down, and the other protruding portion 43 protrudes by seesaw movement. The power turns off.

  In this way, since the power supply is automatically turned off in connection with the storing operation, it is not necessary to bother using the hand to turn off the power supply. Therefore, the scissors 1 can be stored in the storage case A easily and safely when the pruning operation is interrupted or terminated.

  Before the scissors 1 are stored in the storage case A, when the blade is closed and the rocker switch 41 is manually operated to turn off the power, the protrusion 43 of the rocker switch 41 protrudes. In this state, the storage case A When it is housed in, the protrusion 43 engages with the protrusion 44 and cannot be inserted any further. In this way, since the power is not turned on after being inserted, it is safe. In this case, it is only necessary to pull out the scissors 1 again to turn on the rocker switch 41 and insert it.

  Further, when the work is resumed, when the scissor portion 1 is pulled out from the storage case A with the trigger 6 held, the protrusion 43 of the rocker switch 41 is engaged with the convex portion 44 of the storage case A and is pushed down. Contrary to the above, since the power is switched on, it is not necessary to turn on the power switch of the lower power unit after pulling out as in the prior art, so that the work can be started quickly and the work efficiency is improved.

  Next, another example of the first embodiment will be described with reference to FIGS. FIG. 6 is a schematic configuration diagram of the scissor portion of the Hall IC type electric pruning scissors. FIGS. 7A and 7B are views showing the storage operation of the scissor portion 1 in the storage case A, where FIG. 7A shows a state before storage, and FIG. 7B shows a state after storage.

  In the embodiment of the above figure, instead of the rocker switch 41 as a power switch, a Hall IC 45 is provided above the switch block 28 of the scissors 1. In addition, the structure of the other part of the scissor part 1 and a storage case is the same as the said embodiment.

  The Hall IC is a device that converts a magnetic force of a magnet into an electrical signal and outputs it using a Hall element that is a sensor that detects magnetism. It is widely used as a proximity switch by utilizing the characteristic that the output of the Hall IC switches when the magnet approaches and the magnetic flux density exceeds a certain set value.

  In the vicinity of the opening on the inner surface of the storage case A, a magnet 46 is formed as a switching means at a portion corresponding to the convex portion 44 of the storage case A. The magnet 46 is formed at a position through which the Hall IC 45 always passes when stored in the storage case A with the blade of the scissors 1 closed.

  In the above configuration, when the scissors 1 are stored in the storage case A when the operation is interrupted or after the operation is completed, the movable blade 9 is rotated in the closing direction by pulling the trigger 6 as shown in FIG. The blade is fully closed, and the scissors 1 is inserted into the storage case A as it is. On the way, as shown in FIG. 7B, the Hall IC 45 of the scissor portion 1 passes in front of the magnet 46 of the storage case A. Therefore, the Hall IC 45 detects the magnetism of the magnet 46 on the upper wall of the case inner surface, Switch from ON to OFF.

  Also in this case, since the power supply is automatically turned off in connection with the storing operation, it is not necessary to use a hand to turn off the power supply. Therefore, the scissors 1 can be stored in the storage case A easily and safely when the pruning operation is interrupted or terminated. Further, when the operator resumes the work, when the operator pulls out the scissors 1 from the storage case A with the trigger 6 held, the Hall IC 45 detects the magnetic flux density and switches the power from OFF to ON. There is no need to insert.

  Further, since the power switch is a non-contact type, there is an advantage that problems such as wear of the contact surface and poor contact of the changeover switch do not occur.

  Next, a second embodiment will be described with reference to FIG. The figure shows the storage operation of the electric pruning scissors in the storage case A of the second embodiment (a) before storage, (b) during storage, (c) after storage. .

  In the present embodiment, only the configuration of the storage case A is different from the first embodiment. That is, the storage case A is characterized in that an engaging portion 48 for the trigger 6 is provided at the lower portion thereof.

  The engaging portion 48 is a portion extending obliquely downward and rearward from the opening end of the storage case A toward the trigger storage side, and when the blade is stored in the case with the blade of the scissor portion 1 open, The trigger 6 is formed to be engaged with the trigger 6 at a position where the trigger 6 passes and before the switching means.

  In the above configuration, when the scissors 1 are stored in the storage case A when the operation is interrupted or after the operation is completed, the movable blade 9 is opened and the blade is fully opened as shown in FIGS. The scissors 1 is inserted into the storage case A as it is. At this time, first, the trigger 6 is engaged with the engaging portion 48, so that it rotates in the closing operation direction. For this reason, the movable blade 9 is closed and the blades 8 and 9 are fully closed. The trigger 6 is accommodated in the trigger receiving portion 29. Therefore, when the scissor portion 1 is further inserted in the storage direction, the rocker switch 41 of the scissor portion 1 is now engaged with the convex portion 44 of the storage case A, so that the rocker switch 41 protrudes as shown in FIG. One of the protrusions 42 is pushed down, and the other protrusion 43 protrudes by seesaw motion, and the power is turned off.

  When the trigger 6 is pulled and the blade is fully closed to insert the scissor portion 1 into the storage case A, the rocker switch 41 of the scissor portion 1 engages with the convex portion 44 of the storage case A and pushes down the protrusion 43. Power off.

  As described above, even if the blade of the scissor portion 1 is open, the blade is fully closed in relation to the storing operation, and the power is automatically turned off. Therefore, when the pruning operation is interrupted or terminated, the scissors 1 can be stored in the storage case A easily and safely.

  When the work is resumed, if the scissors 1 is pulled out of the storage case A with the trigger 6 held, the power is turned on.

  Of course, the switching means may be a Hall IC instead of a rocker switch.

The schematic block diagram of the electric pruning scissors and storage case of 1st Embodiment Structure explanatory drawing showing the main parts of electric pruning scissors in cross section Perspective view of scissors It is a figure which shows the accommodation operation | movement to the storage case of a scissor part, (a) is the state before storage, (b) is an enlarged view of the part a of (a). It is a figure which shows the accommodation operation | movement to the storage case of a scissor part, (a) is the state after storage, (b) is an enlarged view of the part b of (a). The perspective view of the scissors part of the electric pruning scissors of the other Example of 1st Embodiment It is a figure which shows the storing operation | movement to the storage case of a scissor part same as the above, (a) is before storing, (b) is explanatory drawing of the state after storing. It is a figure which shows the accommodation operation | movement to the storage case of the electric pruning scissors of 2nd Embodiment, (a) is before storage, (b) is during storage, (c) is explanatory drawing of the state after storage.

Explanation of symbols

A storage case 1 scissors 2 power unit 8 fixed blade 9 movable blade 41, 45 power switch 44, 46 switching means

Claims (2)

An electric motor for separating the scissor portion having a blade that opens and closes and an operating means for operating the blade, and a power unit portion that stores a power source for supplying power to the scissor portion, and for storing the scissor portion in a storage case In the pruning shears storage mechanism,
The scissor portion is provided with a power switch, and the storage case switches the power switch to a position where the power switch passes when the scissor blade is stored in the case with the blade closed. Electric pruning scissors storage mechanism, characterized in that means are provided. The storage case is engaged with the operation means before the switching means at a position where the operation means passes when stored in the case with the scissors blade open. 2. The electric pruning scissors storage mechanism according to claim 1, further comprising an engaging portion for moving the means to a position for closing the blade.

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