JP5995753B2 - Brush cutter - Google Patents

Description

  The present invention relates to a brush cutter for cutting grass, turf, and the like.

  Patent Document 1 discloses an operating rod, an electric motor housed in a front end housing fixed to the front end portion of the operating rod, a rotary blade fixed to a rotary shaft that is rotated by the operation of the electric motor, and a rear end portion of the operating rod. A brush cutter is disclosed that includes a battery pack that is attached to a rear end housing that is fixed to an electric motor and that supplies power to an electric motor. The operation rod of the brush cutter can be divided into a front side rod and a rear side rod, and transportation is facilitated by dividing the operation rod forward and backward. In addition, such a brush cutter uses a plurality of types of battery packs having different voltages and a plurality of types of electric motors having rated voltages suitable for the voltages of the plurality of types of battery packs, thereby rotating the rotational speed of the rotary blade. Some models have different models.

US Pat. No. 5,809,653

  In the brush cutter described above, the user may simultaneously own a plurality of types of brush cutters having different rotational speeds of the rotary blades. In a brush cutter having a plurality of models, there is a possibility that the front kite and the rear kite of different models are connected in a combination in which the voltage of the battery pack is higher than the rated voltage of the electric motor. In such a case, the electric motor may be over-rotated by a battery pack having a voltage higher than the rated voltage, and the electric motor may fail. The present invention uses a plurality of types of power supplies with different voltages and a plurality of types of electric motors having rated voltages suitable for the voltages of the plurality of types of power supplies, with a brush cutter that allows the operation rod to be divided into front and rear. The object is to prevent the front and rear side rods from being connected with a combination in which the voltage of the power source is higher than the rated voltage of the electric motor when there are a plurality of models.

  In order to solve the above problems, the present invention has a front side hook and a rear side hook, and is detachably connected by inserting one of the rear end part of the front side hook and the front end part of the rear side hook into the other. After fixing the operating rod, the electric motor housed in the front end housing fixed to the front end portion of the front side rod, the rotary blade fixed to the rotating shaft rotating by the operation of the electric motor, and the rear end portion of the rear side rod A power source that is attached to the end housing and supplies power to the electric motor, and includes a plug provided on one of the rear end of the front side and the front end of the rear side, and a plug receiver provided on the other side. There are multiple models that use multiple types of power supplies with different electrical voltages and multiple types of electric motors with rated voltages that match the voltages of the multiple types of power supplies. This is a brush cutter whose power supply voltage matches the rated voltage of the electric motor. In this combination, at the position where the plug of the electrical connector and the plug receptacle are electrically connected, one of the front side hook and the rear side hook is fitted and connected to the other, and the voltage of the power source is the rated voltage of the electric motor. In a higher combination, it is provided with blocking means for preventing one of the front side hook and the rear side hook from being inserted into the other at the position where the plug of the electrical connector and the plug receptacle are electrically connected. A brush cutter is provided.

  In the brush cutter configured as described above, in a combination in which the voltage of the power source matches the rated voltage of the electric motor, the operation rod is located at the position where the plug of the electrical connector and the plug receptacle are electrically connected. When the power supply voltage is higher than the rated voltage of the electric motor, the operating rod is in a position where the plug of the electrical connector and the plug receptacle are electrically connected. In addition, by providing a blocking means that prevents one of the front and rear side hooks from being inserted into the other side, the front side and rear side of different models with a combination of the power supply voltage higher than the rated voltage of the electric motor. It is possible to prevent the side rail from being connected, and it is possible to prevent a failure of the electric motor due to power being supplied from a power source higher than the rated voltage.

  In one embodiment of the brush cutter configured as described above, as a blocking means, in a state in which the front heel and the rear heel are connected to each other, on one of the rear end portion of the front heel and the front end portion of the rear heel Is provided with a protrusion projecting toward the other, and a recess groove slidably engaged with the protrusion and extending in the longitudinal direction of the operating rod. The height or width of the protrusion is related to the protrusion. The combination of the height or width of the recessed grooves to be different for each brush cutter model, and the combination of the power supply voltage higher than the rated voltage of the electric motor, the height or width of the protrusions is the height or width of the recessed grooves. It may be longer to prevent one of the front and rear heels from being fitted into the other.

  In one embodiment of the brush cutter configured as described above, as a blocking means, in a state in which the front heel and the rear heel are connected to each other, on one of the rear end portion of the front heel and the front end portion of the rear heel Is provided with a protrusion projecting toward the other side, and a concave groove extending in the longitudinal direction of the operating rod by slidably engaging with the projecting portion on the other side. When the length of the concave groove engaged with the part is different for each brush cutter model and the power supply voltage is higher than the rated voltage of the electric motor, the plug of the electrical connector and the plug receptacle are electrically Before the position to be connected to the protrusion, the protrusion may be locked to the inner part of the longitudinal direction of the concave groove to prevent one of the front side hook and the rear side hook from being inserted into the other. .

  In one embodiment of the brush cutter configured as described above, as a blocking means, in a state in which the front heel and the rear heel are connected to each other, on one of the rear end portion of the front heel and the front end portion of the rear heel Is provided with a protrusion projecting toward the other, and a groove on the other side that is slidably engaged with the protrusion and extending in the longitudinal direction of the operating rod. The number of protrusions and grooves is determined for each type of brush cutter. In a combination in which the voltage of the power source is higher than the rated voltage of the electric motor, the number of protrusions is made larger than the number of concave grooves, and one of the front side hook and the rear side hook is inserted into the other. You may block it.

  In one embodiment of the brush cutter configured as described above, the blocking means uses a plug and a plug receiver, and the number or shape of the plurality of pins of the plug and the plurality of pins of the plug are inserted. When the number or shape of the multiple pin insertion holes on the plug holder is different for each brush cutter model and the power supply voltage is higher than the rated voltage of the electric motor, the multiple pins of the plug holder You may make it the number or shape which cannot be inserted in several pin insertion holes.

  In one embodiment of the brush cutter configured as described above, the blocking means uses the rear end portion of the front heel and the front end portion of the rear heel, and the rear end portion of the front heel and the front end of the rear heel When the power supply voltage is higher than the rated voltage of the electric motor, one of the rear end part of the front side and the front end part of the rear side It is good also as a diameter or shape which cannot be inserted in the other.

It is a perspective view which shows 1st Embodiment of the brush cutter of this invention. (A) is a perspective view of the state which connected the front side hook and the rear side hook, (b) is a perspective view of the state which decomposed | disassembled the rear side hook and the front side hook. It is sectional drawing along the longitudinal direction of FIG. FIG. 2 is a longitudinal sectional view of a front end portion of FIG. 1. It is sectional drawing of the connection part in each model of 1st Embodiment. (A) It is sectional drawing of the connection part in the 18V model, (b) It is sectional drawing when combining the rear side rod of the 18V model, and the front side rod of the 10.8V model. It is sectional drawing of the connection part in each model of 2nd Embodiment. (A) It is sectional drawing of the connection part in the 10.8V model of 2nd Embodiment, (b) Sectional drawing when combining the rear side collar of the 18V model, and the front side collar of the 10.8V model It is. It is sectional drawing of the connection part in each model of 3rd Embodiment. (A) It is sectional drawing of the connection part in the model of 10.8V of 3rd Embodiment, (b) Sectional drawing when combining the rear side collar of the 18V model, and the front side collar of the 10.8V model It is. It is sectional drawing of the connection part in each model of 4th Embodiment. (A) It is sectional drawing of the connection part in the 18V model of 4th Embodiment, (b) It is sectional drawing when combining the rear side collar of the 18V model, and the front side collar of the 10.8V model. . It is the schematic which shows the engagement state of the protrusion and the ditch | groove in each model of 5th Embodiment. It is the schematic which shows the engagement state of the protrusion and the ditch | groove in each model of 6th Embodiment. It is sectional drawing of the connection part in each model of 8th Embodiment. (A) It is sectional drawing of the connection part in the 18V model of 8th Embodiment, (b) It is sectional drawing when combining the rear side collar of an 18V model, and the front side collar of a 10.8V model. .

Hereinafter, each embodiment of a brush cutter of the present invention will be described with reference to the drawings.
(First embodiment)
As shown in FIG. 1, the brush cutter 10 includes an operation rod 11 having an elongated cylindrical shape extending in the front-rear direction, a cutter unit 30 at a front end portion of the operation rod 11, and a controller unit 40 at a rear end portion of the operation rod 11. And.

  As shown in FIGS. 1 and 2, the operation rod 11 has a front rod 12 and a rear rod 13 that can be divided into front and rear, and a joint 14 that constitutes a part of the front end of the rear rod 13 has a front side. It is detachably connected by inserting the rear end portion of the collar 12. A cutter unit 30 is fixed to the front end portion of the front side rod 12. A protrusion 12a that protrudes toward the joint 14 is provided at a lower portion of the rear end portion of the front rod 12, and the shape of the protrusion 12a that protrudes radially outward from the front rod 12 has a cylindrical shape. ing. A circular locking hole 12 b is formed in the upper part of the rear end portion of the front side collar 12. A controller unit 40 is fixed to the rear end portion of the rear side rod 13.

  As shown in FIGS. 2 and 3, the joint 14 constituting a part of the front end portion of the rear rod 13 is formed of a hollow cylindrical member. The front end portion of the collar body 13a of the rear collar 13 is fitted to the rear half of the joint 14 and is integrally fixed by screws. Moreover, the rear end part of the front side collar 12 is detachably fitted and fixed to the front half part of the joint 14. A concave groove 14a extending in the longitudinal direction of the operating rod 11 is formed in the lower portion of the front half of the joint 14, and a protrusion 12a provided at the rear end of the front rod 12 is slidably engaged with the concave groove 14a. Match. The width and height in the direction orthogonal to the longitudinal direction of the concave groove 14a are substantially the same as the width and height of the protrusion 12a. When the protrusion 12a is engaged with the concave groove 14a, it has a function of preventing the front side collar 12 from rotating in the circumferential direction.

  The joint 14 is formed with a slit 14b extending in the longitudinal direction at a position where the concave groove 14a is formed. Boss portions 14c and 14c are integrally formed on both sides of the slit 14b at the lower portion of the front portion of the joint 14, and bolts 15 for fixing the joint 14 to the front side rod 12 are inserted into the boss portions 14c and 14c. Has been. Further, a nut 17 that is rotated by a lever 16 is provided at the tip of the bolt 15. When the nut 17 is fastened to the bolt 15 by the lever 16, the width of the slit 14 b is slightly narrowed so that the joint 14 is reduced in diameter, and the front rod 12 is fixed to the joint 14. Further, when the nut 17 is loosened from the bolt 15 by the lever 16, the width of the slit 14b is slightly widened so that the diameter of the joint 14 is increased, and the front flange 12 can be detached from the joint 14. A lid 18 is provided at the front portion of the joint 14 so as to close the front end opening so as to be freely opened and closed.

  A locking projection 19 is provided on the upper portion of the front half of the joint 14 at a position facing the locking hole 12b of the front side collar 12, and the locking projection 19 is placed in the locking hole 12b of the front side collar 12 by a spring member. It is energized to be inserted. In a state where the rear end portion of the front side rod 12 is fitted in the joint 14, the locking projection 19 is locked in the locking hole 12 b of the front side rod 12 to prevent the front side rod 12 from being detached from the joint 14. Yes. Further, when the locking projection 19 is extracted from the locking hole 12 b against the urging force of the spring member, the front side collar 12 can be removed from the joint 14.

  As shown in FIG. 3, an electrical connector 20 is provided at a connecting portion between the front side cage 12 and the rear side cage 13, and the electrical connector 20 electrically connects the electric motor 32 and the battery pack (power source) 42. To connect. An insertion plug (plug) 21 constituting the electrical connector 20 is provided at the rear end portion of the front side collar 12, and a plug receiver 23 constituting the electrical connector 20 is provided at the front end part of the rear side collar 13. ing.

  The insertion plug 21 includes a columnar attachment portion 21 a fitted and fixed to the rear end portion in the front side collar 12. A plurality of pins 21b are attached through the attachment portion 21a, and an electrical wiring 22 connected to the electric motor 32 is connected to the plurality of pins 21b.

  The plug receiver 23 is provided with a cylindrical mounting portion 23a that is fitted and fixed in the joint 14 that is the front end portion of the rear side rod 13. The front portion of the mounting portion 23a is attached to and detached from the rear end portion of the front side rod 12. It is inserted as possible. A plurality of pin insertion holes 23b through which the pins 21b of the insertion plug 21 are inserted are formed in the mounting portion 23a, and contact pieces 23c connected to the battery pack 42 by the electric wiring 24 are provided in the pin insertion holes 23b. It has been.

  As shown in FIG. 3A, in the state where the rear end portion of the front rod 12 is fitted into the front half of the joint 14 and the front rod 12 and the rear rod 13 are connected, the front portion of the plug receiver 23 Is inserted into the rear end portion of the front flange 12, and at this time, the pin 21b of the insertion plug 21 is inserted into the pin insertion hole 23b of the plug receiver 23 to contact the contact piece 23c, and the electric motor 32 is electrically connected to the battery pack 42. Connected. On the other hand, as shown in FIG. 3B, in a state where the front side collar 12 is pulled out from the joint 14 and the front side collar 12 and the rear side collar 13 are disassembled, the front portion of the plug receiver 23 is the front side collar 12. The pin 21b of the plug 21 is pulled out from the pin insertion hole 23b of the plug receiver 23, and the electric motor 32 is not electrically connected to the battery pack 42.

  As shown in FIG. 4, the cutter unit 30 includes a front end housing 31 fixed to the front end portion of the front side rod 12. An electric motor 32 is accommodated in the front end housing 31, and a reduction gear 34 that is integrally fixed to a rotary shaft 33 that is rotatably supported by the front end housing 31 is engaged with an output shaft 32 a of the electric motor 32. ing. The distal end portion of the rotating shaft 33 protrudes below the front end housing 31, and the rotating blade 35 is detachably attached to the distal end portion of the rotating shaft 33.

  As shown in FIG. 1, the controller unit 40 mainly includes a rear end housing 41 and a control circuit (not shown). The rear end housing 41 is fixed to the rear end portion of the rear side rod 13 of the operation rod 11. A battery pack 42 is detachably attached to the rear portion of the rear end housing 41. The battery pack 42 is electrically connected to the electric motor 32 by electric wirings 22 and 24 and an electric connector 20 (21, 23) disposed inside the operation rod 11.

  As shown in FIG. 1, a cover 43 is provided at the front end of the operation rod 11. The cover 43 covers the rear side of the rotary blade 35 of the cutter unit 30. A handle 44 is fixed to an intermediate portion of the operation rod 11 in the front-rear direction. The handle 44 extends in the left-right direction intersecting the front-rear direction, and is curved upward from the intermediate portion. Grips 45, 45 that are gripped by an operator are provided at both left and right ends of the handle 44.

  In the brush cutter 10 configured as described above, when the electric motor 32 is operated by power supply from the battery pack 42, the rotating shaft 33 rotates via the reduction gear 34 engaged with the output shaft 32 a, and the rotating shaft 33 is moved to the rotating shaft 33. The fixed rotary blade 35 rotates. The operator holds both the grips 45 and 45 of the handle 44 with his / her left and right hands and applies the rotary blade 35 of the cutter unit 30 at the front end to the grass and turf growing from the ground, thereby cutting the grass and turf.

  There are a plurality of types of brush cutters 10 using a plurality of types of battery packs 42 with different voltages and a plurality of types of electric motors 32 having rated voltages suitable for the voltages of the plurality of types of battery packs 42. ing. The brush cutter 10 of this embodiment uses three types of battery packs 42 of 18V, 14.4V and 10.8V, and three types of electric motors 32 having rated voltages corresponding to the voltages of the battery packs 42. There are three types, and the three types have different rotational speeds of the rotary blade 35. The rated voltage indicates a voltage at which the electric motor 32 can be used stably in design. In addition, although the brush cutter 10 has a plurality of models having different rotational speeds of the rotary blade 35, a plurality of models having different operating time or rotational torque of the rotary blade 35 may exist.

  This brush cutter 10 prevents the rear end portion of the front side cage 12 from being inserted into the joint 14 of the rear side cage 13 of a different model in a combination in which the voltage of the battery pack 42 is higher than the rated voltage of the electric motor 32. A blocking means is provided.

  The blocking means of this embodiment uses a concave groove 14a formed in the projection 12a of the front side collar 12 and the joint 14 at the front end of the rear side collar 13. As shown in FIGS. 5A to 5C, the higher the voltage of the battery pack 42 is, the lower the height ha (ha1 to ha3) of the concave groove 14a of the joint 14 of the rear saddle 13 is. The height (protrusion length) h (h1 to h3) of the protrusion 12a of the front side collar 12 is lowered so as to be engageable with the groove 14a.

  As shown in the 18V model in FIG. 6A, the voltage of the battery pack 42 provided at the rear end of the rear cage 13 matches the rated voltage of the electric motor 32 provided at the front end of the front cage 12. In this case, the protrusion 12a of the front rod 12 is slidably engaged at the back in the longitudinal direction of the concave groove 14a of the joint 14 of the rear rod 13. At this time, the plug 21 of the electrical connector 20 is connected to the plug receiver 23, and the electric motor 32 is electrically connected to the battery pack 42. On the other hand, even if an attempt is made to insert the rear end portion of the front rod 12 of 10.8V into the joint 14 of the rear rod 13 of the 18V model shown in FIG. 6B, the height h3 of the protrusion 12a is concave. Since it is higher than the height ha1 of the groove 14a, the protrusion 12a is locked to the peripheral edge of the inlet of the concave groove 14a, and the rear end portion of the front rod 12 is not inserted into the joint 14 of the rear rod 13.

  In this way, preventing the front kite 12 of a model whose rated voltage of the electric motor 32 is lower than that of the battery pack 42 from being accidentally inserted into the joint 14 of the rear kite 13 of the model having a high voltage of the battery pack 42. I was able to. As a result, the electric motor 32 can be prevented from malfunctioning due to power being supplied from the battery pack 42 exceeding the rated voltage, that is, malfunctioning due to excessive rotation of the electric motor 32. When the 14.4V front rod 12 is fitted into the joint 14 of the rear rod 13 of the 18V model, the 10.8V front rod 12 is inserted into the joint 14 of the 14.4V model rear rod 13. As described above, the protrusion 12a of the front side collar 12 is locked to the peripheral edge of the entrance of the concave groove 14a, and the rear end of the front side collar 12 is inside the joint 14 of the rear side collar 13, as described above. The same action and effect can be obtained without being inserted into.

  In this embodiment, the higher the voltage of the battery pack 42 is, the lower the height of the concave groove 14a of the joint 14 of the rear side collar 13 is set, and the height of the protrusion 12a of the front side collar 12 is changed to the concave groove 14a. The length was lowered to be engageable. However, the present invention is not limited to this. The higher the voltage of the battery pack 42 is, the shorter the circumferential width of the concave groove 14a of the joint 14 of the rear collar 13 and the protrusion of the front collar 12 are. You may shorten the width | variety of the part 12a so that it may become the length which can be engaged with the concave groove 14a. Even when this is done, even if the 10.8V front rod 12 is inserted into the joint 14 of the rear rod 13 of the 18V model, the protrusion 12a of the front rod 12 has a peripheral edge of the inlet of the concave groove 14a. The rear end portion of the front side rod 12 is not inserted into the joint 14 of the rear side rod 13. As a result, it is possible to prevent the front kite 12 of a model whose rated voltage of the electric motor 32 is lower than that of the battery pack in the joint 14 of the model of the rear kite 13 having a high voltage of the battery pack 42, The electric motor 32 could prevent a failure caused by being supplied with power from the battery pack 42 that exceeded the rated voltage. When the 14.4V front rod 12 is fitted into the joint 14 of the rear rod 13 of the 18V model, the 10.8V front rod 12 is inserted into the joint 14 of the 14.4V model rear rod 13. As described above, the protrusion 12a of the front side collar 12 is locked to the peripheral edge of the entrance of the concave groove 14a, and the rear end of the front side collar 12 is inside the joint 14 of the rear side collar 13, as described above. The same action and effect can be obtained without being inserted into.

(Second Embodiment)
The operating rod 11 of the first embodiment described above is detachably connected by fitting the rear end portion of the front side rod 12 into the joint 14 constituting a part of the front end portion of the rear side rod 13. In the second embodiment, the front rod 12A has a joint 14A fixed to the rear end portion of the rod main body 12Ac, and the operation rod 11A has a rear collar on the joint 14A constituting a part of the rear end portion of the front rod 12A. The front end portion of 13A is detachably connected by being inserted. In the second embodiment, a protrusion 12Aa that protrudes toward the joint 14A is provided at the lower part of the front end portion of the rear side flange 13A, and the rear half of the joint 14A that constitutes a part of the rear end portion of the front side flange 12A. A concave groove 14Aa extending along the longitudinal direction of the operating rod 11A is formed in the lower portion, and a protrusion 12Aa provided at the front end portion of the rear rod 13A is slidably engaged with the concave groove 14Aa. Except this point, the configuration is the same as that of the blocking means of the first embodiment described above.

  In the second embodiment, as shown in FIGS. 7A to 7C, the lower the voltage of the battery pack 42, the higher the height ha (ha1) of the concave groove 14Aa of the joint 14A of the front flange 12A. -Ha3) was lowered, and the height h (h1-h3) of the protrusion 12Aa of the rear side flange 13A was lowered so as to be engageable with the groove 14Aa.

  As shown in the model of 10.8V in FIG. 8A, the voltage of the battery pack 42 provided at the rear end of the rear cage 13A is the rated voltage of the electric motor 32 provided at the front end of the front cage 12A. When this is adapted, the projecting portion 12Aa of the rear side collar 13A is slidably engaged at the back in the longitudinal direction of the concave groove 14Aa of the joint 14A of the front side collar 12A. At this time, the plug 21 of the electrical connector 20 is connected to the plug receiver 23, and the electric motor 32 is electrically connected to the battery pack 42. On the other hand, even if the front end portion of the rear rod 13A of the 18V model shown in FIG. 8B is inserted into the joint 14A of the 10.8V front rod 12A, the height h1 of the projection 12Aa is a concave groove. Since it is higher than the height ha3 of 14Aa, the protrusion 12Aa of the rear side flange 13A is locked to the peripheral edge of the inlet of the concave groove 14Aa, and the rear side flange 13A cannot be inserted into the joint 14A of the front side flange 12A.

  In this way, the front end portion of the rear side cage 13A of the model having a high voltage of the battery pack 42 is erroneously inserted into the joint 14A of the front side cage 12A of the model having the rated voltage of the electric motor 32 lower than that of the battery pack 42. Was able to prevent. As a result, the electric motor 32 can be prevented from malfunctioning due to power being supplied from the battery pack 42 exceeding the rated voltage, that is, malfunctioning due to excessive rotation of the electric motor 32. In addition, when the rear rod 13A of the 18V model is inserted into the joint 14A of the 14.4V front rod 12A, the rear rod 13A of the 14.4V model is inserted into the joint 14A of the 10.8V front rod 12A. In the same manner as described above, the protrusion 12Aa of the rear side hook 13A is locked to the periphery of the inlet portion of the concave groove 14Aa, and the rear side hook 13A is not inserted into the joint 14A of the front side hook 12A. The same effect can be obtained.

  In this embodiment, the lower the voltage of the battery pack 42, the lower the height of the concave groove 14Aa of the joint 14A of the front side collar 12A and the height of the protrusion 12Aa of the rear side collar 13A. The length is low so that the length can be engaged. However, the present invention is not limited to this, and the lower the voltage of the battery pack 42, the shorter the width of the concave groove 14Aa of the joint 14A of the front side collar 12A and the protrusion 12Aa of the rear side collar 13A. The width may be shortened to be a length that can be engaged with the concave groove 14Aa. Even if it does in this way, even if it tries to insert the rear side collar 13A of the 18V model into the joint 14A of the front side collar 12 of 10.8V, the protrusion 12Aa of the rear side collar 13A is the entrance portion of the concave groove 14Aa. The front end of the rear side collar 13A is not fitted into the joint 14A of the front side collar 12A. This prevents the rear end portion of the front bag 12 of the model whose rated voltage of the electric motor 32 is lower than that of the battery pack from being erroneously inserted into the joint 14A of the rear bag 13A of the model whose battery pack 42 voltage is high. Thus, the electric motor 32 can prevent a failure caused by being supplied with power from the battery pack 42 exceeding the rated voltage. In addition, when the rear rod 13A of the 18V model is inserted into the joint 14A of the 14.4V front rod 12A, the rear rod 13A of the 14.4V model is inserted into the joint 14A of the 10.8V front rod 12A. In the same manner as described above, the protrusion 12Aa of the rear side hook 13A is locked to the peripheral edge of the inlet of the concave groove 14Aa, and the front end of the rear side hook 13A is in the joint 14A of the front side hook 12A. The same action and effect can be obtained without being inserted into.

(Third embodiment)
The blocking means of the third embodiment also uses the concave groove 14Ba formed in the projection 12Ba of the front side collar 12B and the joint 14B at the front end of the rear side collar 13B. As shown in FIGS. 9A to 9C, in the operating rod 11B, the longer the battery pack 42 is, the longer the length in the longitudinal direction of the groove 14Ba of the joint 14B of the rear rod 13B. In addition, the protrusion 12Ba of the front flange 12B can be engaged with the back of the groove 14Ba at a position where the plug 21 of the electrical connector 20 is electrically connected to the plug receiver 23. In order to be in front of other models. That is, the shorter the length of the concave groove 14Ba of the joint 14B, the longer the length la (la1 to la3) between the back wall of the concave groove 14Ba and the front end surface of the plug receiver 23, and this corresponds to this. The length l (l1 to l3) between the protrusion 12Ba of the front flange 12B and the rear end surface of the attachment portion 21a of the plug 21 is increased. For this reason, the higher the voltage of the battery pack 42 is, the more the protrusion 12Ba is provided at the front side position than the other models. Except this point, the configuration is the same as that of the blocking means of the first embodiment described above.

  As shown in the model of 10.8V in FIG. 10A, the voltage of the battery pack 42 provided at the rear end portion of the rear side cage 13B is the rated voltage of the electric motor 32 provided at the front end portion of the front side cage 12B. When this is adapted, the protrusion 12Ba of the front side collar 12B is slidably engaged at the back in the longitudinal direction of the concave groove 14Ba of the joint 14B of the rear side collar 13B. At this time, the plug 21 of the electrical connector 20 is connected to the plug receiver 23, and the electric motor 32 is electrically connected to the battery pack 42.

  On the other hand, even if the 10.8V front rod 12B is inserted into the joint 14B of the rear rod 13B of the 18V model shown in FIG. 10B, the rear wall of the concave groove 14Ba and the front end surface of the plug receiver 23 Is longer than the length l3 between the projecting portion 12Ba and the rear end face of the attachment portion 21a of the insertion plug 21, before the insertion plug 21 is connected to the plug receiver 23. The protrusion 12Ba of 12B engages with the longitudinal inner wall of the concave groove 14Ba. Thereby, even if the front side collar 12B of the model whose rated voltage of the electric motor 32 is lower than that of the battery pack 42 is erroneously inserted into the joint 14B of the rear side collar 13B of the model having a high voltage of the battery pack 42, the plug 21 The rear end portion of the front side collar 12B is not inserted into the joint 14B of the rear side collar 13B until the position is connected to the plug receiver 23. Thereby, the electric motor 32 was able to prevent the failure resulting from the power supply from the battery pack 42 exceeding the rated voltage. When the 14.4V front rod 12B is inserted into the joint 14B of the 18V model rear rod 13B, the 10.8V front rod 12B is inserted into the joint 14B of the 14.4V model rear rod 13B. In the same manner as described above, the front side collar 12B is not inserted into the joint 14B of the rear side collar 13B until the position where the insertion plug 21 is connected to the plug receiver 23 as described above. Similar effects can be obtained.

(Fourth embodiment)
The operating rod 11B of the third embodiment described above is detachably coupled by fitting the rear end portion of the front rod 12B into a joint 14B that constitutes a part of the front end portion of the rear rod 13B. In the fourth embodiment, the front rod 12C has a joint 14C fixed to the rear end portion of the rod main body 12Cc, and the operation rod 11C is connected to the joint 14C constituting a part of the rear end portion of the front rod 12C. It is connected so that it can be attached and detached by inserting 13 front end portions. In the fourth embodiment, a protrusion 12Ca that protrudes toward the joint 14C is provided at the lower part of the front end portion of the rear side flange 13C, and the rear part of the joint 14C that constitutes a part of the rear end portion of the front side flange 12C. A concave groove 14Ca extending along the longitudinal direction of the operating rod 11C is formed in the lower portion, and a protrusion 12Ca provided at the front end of the rear rod 13C is slidably engaged with the concave groove 14Ca.

  In the fourth embodiment, as shown in FIGS. 11A to 11C, the lower the voltage of the battery pack 42, the longer the longitudinal length of the concave groove 14Ca of the joint 14C of the front flange 12C. , And the protrusion 12Ca of the rear flange 13C can be engaged at the back of the concave groove 14Ca at a position where the plug 21 of the electrical connector 20 is electrically connected to the plug receiver 23. Thus, it was provided so as to be at the rear side position from other models. That is, when the length of the concave groove 14Ca of the joint 14C is shorter, the length la (la1 to la3) between the inner wall of the concave groove 14Ca and the rear end surface of the attachment portion 21a of the insertion plug 21 is longer. The length l (l1 to l3) between the protruding portion 12Ca of the rear flange 13C and the front end surface of the mounting portion 23a of the plug receiver 23 is increased. For this reason, the lower the voltage of the battery pack 42 is, the more the protrusion 12Ba is provided at the rear side position than the other models. Except for this point, the configuration is the same as that of the third embodiment described above.

  As shown in the 18V model of FIG. 12A, the voltage of the battery pack 42 provided at the rear end portion of the rear side cage 13C matches the rated voltage of the electric motor 32 provided at the front end portion of the front side cage 12C. In this case, the protrusion 12Ca of the rear side hook 13C is slidably engaged with the inner part of the concave groove 14Ca of the joint 14C of the front side hook 12C. At this time, the plug 21 of the electrical connector 20 is connected to the plug receiver 23, and the electric motor 32 is electrically connected to the battery pack 42.

  On the other hand, even if the front end portion of the rear rod 13C of the 18V model in FIG. 12B is inserted into the joint 14C of the front rod 12C of 10.8V, the back wall of the concave groove 14Ca and the plug 21 Since the length la3 between the rear end surface of the mounting portion 21a is longer than the length l1 between the projecting portion 12Ca and the rear end surface of the plug receiver 23, the insertion plug 21 is connected to the plug receiver 23 before it is connected. The protrusion 12Ca of the front side collar 12C is locked to the longitudinal inner wall of the concave groove 14Ca. Accordingly, even if the front end portion of the rear cage 13C having a high voltage of the battery pack 42 is mistakenly inserted into the joint 14C of the front cage 12C of the model having a rated voltage of the electric motor 32 lower than that of the battery pack 42, there is no difference. Until the insertion plug 21 is connected to the plug receiver 23, the front end portion of the rear side flange 13C is not inserted into the joint 14C of the front side flange 12C. Thereby, the electric motor 32 was able to prevent the failure resulting from the power supply from the battery pack 42 exceeding the rated voltage. In addition, when the rear rod 13C of the 18V model is inserted into the joint 14C of the 14.4V front rod 12C, the rear rod 13C of the 14.4V model is inserted into the joint 14C of the 10.8V front rod 12C. In the same manner as described above, the front end portion of the rear side collar 13C is not inserted into the joint 14B of the front side collar 12B until the position where the plug 21 is connected to the plug receiver 23 as described above. It is possible to obtain the same operational effects as those described above.

(Fifth embodiment)
The blocking means of the fifth embodiment also uses a concave groove 14Da formed in the projection 12Da of the front side collar 12D and the joint 14D at the front end of the rear side collar 13D. As shown in FIGS. 13A to 13C, in the operating rod 11D, the lower the voltage of the battery pack 42, the larger the number of protrusions 12Da of the front rod 12D and the rear rod 13D. The number of the concave grooves 14Da of the joint 14D was increased according to the number of the protrusions 12Da. Except this point, the configuration is the same as that of the blocking means of the first embodiment described above.

  As shown in FIGS. 13A to 13C, the voltage of the battery pack 42 provided at the rear end portion of the rear side cage 13D matches the rated voltage of the electric motor 32 provided at the front end portion of the front side cage 12D. When doing so, each protrusion 12Da of the front side collar 12D is engaged with each concave groove 14Da of the joint 14D of the rear side collar 13D. On the other hand, for example, even if the 10.8V front rod 12D is to be inserted into the joint 14D of the 18V model rear rod 13D, the left and right projections 12Da are locked to the periphery of the inlet portion at the rear of the joint 14D. The front rod 12D is not inserted into the joint 14D of the rear rod 13D.

  In this way, it is possible to prevent the front side cage 12D of the model whose rated voltage of the electric motor 32 is lower than that of the battery pack 42 from being accidentally inserted into the joint 14D of the rear side cage 13D of the model having a high voltage of the battery pack 42. did it. As a result, the electric motor 32 can be prevented from malfunctioning due to power being supplied from the battery pack 42 exceeding the rated voltage, that is, malfunctioning due to excessive rotation of the electric motor 32. When the 14.4V front rod 12D is inserted into the joint 14D of the 18V model rear rod 13D, the 10.8V front rod 12D is inserted into the 14.4V model rear rod 13D joint 14D. In the same manner as described above, a part of the protrusion 12Da of the front side collar 12D is locked to the peripheral edge of the inlet of the rear part of the joint 14D, and the front side collar 12D is located in the joint 14D of the rear side collar 13D. The same action and effect can be obtained without being inserted into.

(Sixth embodiment)
The operating rod 11D of the fifth embodiment described above is detachably connected by fitting the rear end portion of the front rod 12D into a joint 14D that constitutes a part of the front end portion of the rear rod 13D. In the sixth embodiment, the front rod 12E has a joint 14E fixed to the rear end portion of the rod main body 12Ec, and the operation rod 11E is connected to the joint 14E constituting a part of the rear end portion of the front rod 12E. The front end of 13E is detachably connected by being inserted. As shown in FIGS. 14A to 14C, the higher the voltage of the battery pack 42 is, the more the number of the protrusions 12Ea of the rear side hook 13E is increased, and the concave groove of the joint 14E of the front side hook 12E is increased. The number of 14Ea was increased according to the number of protrusions 12Ea. Except for this point, the configuration is the same as that of the blocking means of the fifth embodiment described above.

  As shown in FIGS. 14A to 14C, the voltage of the battery pack 42 provided at the rear end portion of the rear side cage 13E matches the rated voltage of the electric motor 32 provided at the front end portion of the front side cage 12E. When doing so, each protrusion 12Ea of the rear side collar 13E is engaged with each concave groove 14Ea of the joint 14E of the front side collar 12E. On the other hand, for example, even if the front end portion of the rear rod 13E of the 18V model is to be inserted into the joint 14E of the 10.8V front rod 12E, the left and right protrusions 12Ea are located on the front edge of the inlet portion of the joint 14E. The front end of the rear side collar 13E cannot be inserted into the joint 14E of the front side collar 12E.

  Thus, the front end portion of the rear cage 13E of the model having a high voltage of the battery pack 42 is erroneously inserted into the joint 14E of the front cage 12E of the model having the rated voltage of the electric motor 32 lower than that of the battery pack 42. Was able to prevent. As a result, the electric motor 32 can be prevented from malfunctioning due to power being supplied from the battery pack 42 exceeding the rated voltage, that is, malfunctioning due to excessive rotation of the electric motor 32. In addition, when the rear rod 13E of the 18V model is inserted into the joint 14E of the 14.4V front rod 12E, the rear rod 13E of the 14.4V model is inserted into the joint 14E of the 10.8V front rod 12E. In the same manner as described above, a part of the protrusion 12Ea of the rear side hook 13E is locked to the peripheral edge of the inlet portion of the rear part of the joint 14E, and the front end of the rear side hook 13E is the front side hook 12E. Cannot be inserted into the joint 14E, and similar effects can be obtained.

(Seventh embodiment)
The blocking means of the seventh embodiment uses an insertion plug 21 and a plug receiver 23 that constitute the electrical connector 20. As the battery pack 42 has a lower voltage, the number of pins 21b of the plug 21 is increased, and the number of pin insertion holes 23b of the plug receiver 23 is increased in accordance with the number of pins 21b. Except this point, the configuration is the same as that of the blocking means of the first embodiment described above.

  When the voltage of the battery pack 42 provided at the rear end portion of the rear side cage 13 conforms to the rated voltage of the electric motor 32 provided at the front end portion of the front side cage 12, each of the plugs 21 of the insertion plug 21 of the front side cage 12 The pin 21 b is inserted into each pin insertion hole 23 b of the plug receiver 23 of the rear side cage 13. On the other hand, for example, even if an attempt is made to insert the rear end portion of the front rod 12 of 10.8V into the joint 14 of the rear rod 13 of the 18V model, the pin 21b of the insertion plug 21 of the front rod 12 is Since there are more pin insertion holes 23 b of the plug receiver 23 of the flange 13, the pins 21 b of the insertion plug 21 cannot be inserted into the pin insertion holes 23 b of the plug receiver 23.

  In this way, even if the front rod 12 of a model whose rated voltage of the electric motor 32 is lower than that of the battery pack 42 is mistakenly inserted into the joint 14 of the rear rod 13 of the model having a high voltage of the battery pack 42, the plug is inserted. Until the plug 21 is connected to the plug receiver 23, the rear end portion of the front side rod 12 is not inserted into the joint 14 of the rear side rod 13. Thereby, the electric motor 32 was able to prevent the failure resulting from the power supply from the battery pack 42 exceeding the rated voltage. When the 14.4V front rod 12 is fitted into the joint 14 of the rear rod 13 of the 18V model, the 10.8V front rod 12 is inserted into the joint 14 of the 14.4V model rear rod 13. In the same manner as described above, the rear end portion of the front side collar 12 is not inserted into the joint 14 of the rear side collar 13 until the insertion plug 21 is connected to the plug receiver 23 in the same manner as described above. The same effects as described above can be obtained.

  In the seventh embodiment, the operation rod 11 is detachably connected by fitting the rear end portion of the front rod 12 into the joint 14 constituting a part of the front end portion of the rear rod 13. However, the operation rod 11 is not limited to this, and the operation rod 11 is detachably connected by fitting the front end portion of the rear rod 13 into the joint 14 constituting a part of the rear end portion of the front rod 12. Even in this case, similar effects can be obtained.

  Further, in the seventh embodiment, as the battery pack 42 has a lower voltage, the number of pins 21b of the plug 21 is increased, and the number of pin insertion holes 23b of the plug receiver 23 is set to the number of pins 21b. Increased according to. The present invention is not limited to this, and for each model with different voltages, the shape of the pin 21b of the plug 21 and the mounting position of the pin 21b of the cylindrical mounting portion 21a are changed, and the pin of the plug receiver 23 is changed. The shape of the insertion hole 23b and the position where the pin insertion hole 23b is provided with respect to the attachment portion 23a may be changed according to the pin 21b. At this time, for example, as the battery pack 42 has a lower voltage, the shape of the pin 21b of the insertion plug 21 is increased, and the shape of the pin insertion hole 23b of the plug receiver 23 is increased according to the shape of the pin 21b. That's fine. Even in this case, the same effects as described above can be obtained.

  It should be noted that not all the pins 21b of the plug 21 used for the blocking means of this embodiment need to be involved in the electrical connection of the electrical connector 20, but are pseudo ones not involved in the electrical connection of the electrical connector 20. There may be.

(Eighth embodiment)
The blocking means of the eighth embodiment uses a joint 14F that constitutes the rear end portion of the front side rod 12F and the front end portion of the rear side rod 13F. As shown in FIGS. 15A to 15C, in the operating rod 11F, the lower the voltage of the battery pack 42, the larger the outer diameter of the rear end portion of the front rod 12, and the rear rod. The inner diameter da (da1 to da3) of the joint 14F constituting the front end portion of 13F was increased according to the outer diameter d (d1 to d3) of the front flange 12F. Except this point, the configuration is the same as that of the blocking means of the first embodiment described above.

  As shown in FIG. 16 (a), when the voltage of the battery pack 42 provided at the rear end of the rear kite 13F matches the rated voltage of the electric motor 32 provided at the front end of the front kite 12F. The rear end portion of the front rod 12F is inserted into the joint 14F of the rear rod 13F. On the other hand, as shown in FIG. 16 (b), even if an attempt is made to insert the front rod 12F of 10.8V into the joint 14F of the rear rod 13F of the 18V model, the inner diameter da1 of the joint 14F is not increased. Since it is smaller than the outer diameter d3 of 12F, the rear end of the front rod 12F is locked to the inlet periphery of the joint 14F of the rear rod 13F, and the front rod 12F is not inserted into the joint 14F of the rear rod 13F.

  In this manner, it is possible to prevent the front side hook 12F of the model whose rated voltage of the electric motor 32 is lower than that of the battery pack 42 from being accidentally inserted into the joint 14F of the rear side hook 13F of the model having a high battery pack 42 voltage. did it. As a result, the electric motor 32 can be prevented from malfunctioning due to power being supplied from the battery pack 42 exceeding the rated voltage, that is, malfunctioning due to excessive rotation of the electric motor 32. When the 14.4V front rod 12F is fitted into the joint 14F of the 18V model rear rod 13F, the 10.8V front rod 12F is inserted into the joint 14F of the 14.4V model rear rod 13F. In the same manner as described above, the rear end of the front side collar 12F is locked to the periphery of the inlet portion of the joint 14F of the rear side collar 13F, and the front side collar 12F is placed in the joint 14F of the rear side collar 13F. The same effect can be obtained without being inserted.

  In the eighth embodiment, the operating rod 11F is detachably connected by fitting the rear end portion of the front rod 12F into a joint 14F constituting a part of the front end portion of the rear rod 13F. is there. The present invention is not limited to this, and the operation rod 11F is detachably connected by fitting the front end portion of the rear rod 13F into a joint 14F constituting a part of the rear end portion of the front rod 12F. It may be. In this case, the lower the voltage of the battery pack 42, the smaller the inner diameter of the joint 14 constituting a part of the rear end portion of the front side collar 12F, and the outer diameter of the front end portion of the rear side collar 13F. What is necessary is just to make small according to the internal diameter of 14F. Even in this case, the same effects as described above can be obtained.

  In the eighth embodiment, the outer diameter of the rear end portion of the front rod 12 is changed according to the voltage of the battery pack 42, and the inner diameter of the joint 14F constituting the front end portion of the rear rod 13F is changed to the front rod 12F. It was changed according to the outer diameter. The present invention is not limited to this, and the outer diameter of only the rear end portion of the front side rod 12 may be changed, or the outer diameter may be changed over the entire length of the front side rod 12. Similarly, the inner diameter of only the joint 14F constituting the front end portion of the rear side flange 13F may be changed, or the inner diameter may be changed over the entire length of the rear side flange 13F.

  In the eighth embodiment, the lower the voltage of the battery pack 42, the larger the outer diameter of the rear end portion of the front rod 12F and the inner diameter of the joint 14F constituting the front end portion of the rear rod 13F. Was increased according to the outer diameter of the front ridge 12F. The present invention is not limited to this, and the shape of the outer peripheral surface of the rear end portion of the front rod 12F and the shape of the inner peripheral surface of the joint 14F constituting the front end portion of the rear rod 13F for each model having different voltages. May be changed in accordance with the shape of the outer peripheral surface of the rear end portion of the front rod 12F. Similarly, the shape of the outer peripheral surface of the front end portion of the rear side rod 13F and the shape of the inner peripheral surface of the joint 14F constituting a part of the rear end portion of the front side rod 12F are the same as those of the outer peripheral surface of the front end portion of the rear side rod 13F. It may be changed according to the shape. Even in this case, the same effects as described above can be obtained.

  In each of the above embodiments, the joint is fixed to the front end portion of the heel body of the rear heel so that the joint forms a part of the front end portion of the rear heel or the rear heel body of the front heel By fixing the joint to the end, the joint constitutes a part of the rear end of the front heel. The present invention is not limited to this, and it may be a joint portion into which the rear end portion of the front heel is fitted by expanding the diameter of the front end portion of the rear heel from other portions. Similarly, it may be a joint portion into which the front end portion of the rear side rod is inserted by expanding the diameter of the rear end portion of the front side rod from other portions.

  Each of the above embodiments includes the three types of brush cutters 10 to 10F, in which the voltage of the battery pack 42 is 18V, 14.4V, and 10.8V, but the present invention is not limited to this, and the voltage of the battery pack 42 Even if there are two or more types of models, the same effect can be obtained.

  In the above embodiment, the rotary blade 35 is fixed to the tip of the rotary shaft 33 that rotates by the operation of the electric motor 32. However, the present invention is not limited to this, and the output shaft 32a of the electric motor 32 is used as the rotary shaft. The rotary blade 35 may be fixed to the tip of the output shaft 32a.

 DESCRIPTION OF SYMBOLS 10 ... Brush cutter, 11-11F ... Operation rod, 12-12F ... Front side rod, 12a-12Fa ... Projection, 13-13F ... Rear side rod, 14-14F ... Joint, 14a-14Fa ... Groove, 20 ... Electricity Connector, 21 ... Plug, 21b ... Pin, 23 ... Plug receptacle, 23b ... Pin insertion hole, 31 ... Front end housing, 32 ... Electric motor, 33 ... Rotary shaft, 35 ... Rotating blade, 42 ... Power source (battery pack).

Claims (6)

An operating rod that has a front and rear rods, and is detachably connected by inserting one of the rear end portion of the front rod and the front end portion of the rear rod into the other;
An electric motor housed in a front end housing fixed to the front end portion of the front side cage;
A rotary blade fixed to a rotary shaft that rotates by the operation of the electric motor;
A power source that is attached to a rear end housing fixed to a rear end portion of the rear side collar, and supplies power to the electric motor;
An electrical connector comprising a plug provided at one of the rear end of the front side and the front end of the rear side and a plug receiver provided at the other, electrically connecting the electric motor and the power source. ,
A brush cutter in which there are a plurality of models using a plurality of types of the power sources with different voltages and a plurality of types of the electric motors having a rated voltage adapted to the voltages of the plurality of types of power sources,
In a combination in which the voltage of the power source is adapted to the rated voltage of the electric motor, at the position where the plug of the electrical connector and the plug receptacle are electrically connected, one of the front side hook and the rear side hook is on the other side. Inserted and connected,
In a combination in which the voltage of the power source is higher than the rated voltage of the electric motor, one of the front side hook and the rear side hook is fitted to the other at a position where the plug and the plug receptacle of the electrical connector are electrically connected. A brush cutter comprising blocking means for blocking insertion. The brush cutter according to claim 1,
As the blocking means, in a state where the front side hook and the rear side hook are connected to each other, one of the rear end part of the front side hook and the front end part of the rear side hook has a protrusion protruding toward the other. The other is provided with a groove that slidably engages with the protrusion and extends in the longitudinal direction of the operating rod,
The height or width of the protrusion and the height or width of the concave groove engaged with the protrusion are different for each type of the brush cutter,
In a combination in which the voltage of the power source is higher than the rated voltage of the electric motor, the height or width of the protrusion is made longer than the height or width of the concave groove, and one of the front side hook and the rear side hook is the other. A brush cutter characterized in that it is prevented from being inserted into the brush. The brush cutter according to claim 1,
As the blocking means, in a state where the front side hook and the rear side hook are connected to each other, one of the rear end part of the front side hook and the front end part of the rear side hook has a protrusion protruding toward the other. The other is provided with a groove that slidably engages with the protrusion and extends in the longitudinal direction of the operating rod,
The length in the longitudinal direction of the operating rod of the protrusion and the length in the longitudinal direction of the concave groove engaged with the protrusion are different for each type of the brush cutter,
In a combination in which the voltage of the power source is higher than the rated voltage of the electric motor, the projecting portion is deeper in the longitudinal direction of the concave groove before the plug of the electrical connector and the plug receiver are in a position to be electrically connected. A brush cutter characterized in that one of the front side hook and the rear side hook is prevented from being inserted into the other so as to be locked to a part. The brush cutter according to claim 1,
As the blocking means, in a state where the front side hook and the rear side hook are connected to each other, one of the rear end part of the front side hook and the front end part of the rear side hook has a protrusion protruding toward the other. The other is provided with a groove that slidably engages with the protrusion and extends in the longitudinal direction of the operating rod,
The number of the protrusions and the groove is different for each type of the brush cutter,
When the voltage of the power source is a combination higher than the rated voltage of the electric motor, the number of the protrusions is made larger than the number of the concave grooves, and one of the front side rod and the rear side rod is inserted into the other. A brush cutter characterized by preventing The brush cutter according to claim 1,
The blocking means uses the plug and the plug receiver,
The number or shape of the plurality of pins of the plug and the number or shape of the plurality of pin insertion holes of the plug receiver into which the plurality of pins of the plug are inserted differ for each type of the brush cutter,
A brush cutter having a number or shape in which a plurality of pins of the plug cannot be inserted into a plurality of pin insertion holes of the plug receiver when the voltage of the power source is a combination higher than the rated voltage of the electric motor. . The brush cutter according to claim 1,
The blocking means uses a rear end portion of the front heel and a front end portion of the rear heel,
The diameter or shape of the rear end portion of the front side rod and the front end portion of the rear side rod is different for each type of the brush cutter,
When the voltage of the power source is a combination higher than the rated voltage of the electric motor, one of the rear end of the front side and the front end of the rear side has a diameter or shape that cannot be fitted into the other. And brush cutter.

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