JP2022047707A - Hand-held type work machine - Google Patents

Abstract

To provide a hand-held type work machine which can suppress an increase in weight.SOLUTION: A hand-held type work machine 1 has a body 10 having a driving source operated by power, a battery mounting part that is provided on the body 10 and is mounted with a body side battery pack 40A for supplying power to the driving source, and a cable mounting part that is provided on the body 10 and has a connection terminal to which an electric cable 51 electrically connected to an external battery pack 40B for supplying power to the driving source is electrically connected.SELECTED DRAWING: Figure 1

Description

The present invention relates to a handheld working machine.

Patent Document 1 discloses an electric tool as an example of a hand-held working machine. This power tool includes a main body to which the tool is attached, a motor housed in the main body, and a plurality of attachment portions provided on the main body. A battery pack can be attached to and detached from each of the plurality of mounting portions.

Japanese Unexamined Patent Publication No. 2010-51329

When a plurality of battery packs are attached to the handheld work machine, the weight of the entire work machine including the battery pack becomes large. Since the user handles the work machine while holding it in his hand, if the weight of the entire work machine becomes large, it may be difficult for the user to perform the work.

It is an object of the present invention to provide a handheld working machine capable of suppressing an increase in weight even when a plurality of battery packs are used.

The handheld working machine according to one embodiment of the present invention is a main body (10) having a drive source (3) operated by electric power, and a battery mounting portion (12) provided in the main body (10). A battery mounting portion (12) to which a first battery pack (40A) for supplying power to (3) is mounted and has a first connection terminal (13) electrically connected to the first battery pack (40A). ) And the cable (51) electrically connected to the second battery pack (40B) that supplies power to the drive source (3), which is the cable mounting portion (37) provided in the main body (10). A cable mounting portion (37) having a second connection terminal (38) to which is electrically connected.

In the above-mentioned handheld work machine, power is supplied to the drive source (3) by the first battery pack (40A) and the second battery pack (40B), so that compared with the case where only one battery pack is provided. For example, a handheld working machine can be driven for a long time. Since the second battery pack (40B) is connected to the second connection terminal (38) of the cable mounting portion (37) via the cable (51) without being mounted on the main body (10), the operator When using the handheld work machine, the weight of the second battery pack (40B) is not added to the main body (10). Therefore, when using a plurality of battery packs, it is possible to suppress an increase in the weight of the handheld work machine.

The first connection terminal (13) and the second connection terminal (38) of the example may be electrically connected in parallel with the drive source (3). In this configuration, the handheld working machine can be operated even when only one of the first battery pack (40A) and the second battery pack (40B) is connected.

One example of the handheld working machine is a control circuit (18) that selectively switches between the electric power from the first battery pack (40A) and the electric power from the second battery pack (40B) and supplies the electric power to the drive source (3). ) Can be further prepared. In this configuration, power can be supplied from either battery pack while both the first battery pack (40A) and the second battery pack (40B) are connected.

The control circuit (18) of the example is a drive source (3) via the second connection terminal (38) when the power supplied from the first connection terminal (13) is equal to or less than a predetermined threshold value. Can be powered. In this configuration, the first battery pack (40A) and the second battery pack (40B) are connected to the first connection terminal (13) and the second connection terminal (38), respectively. The power of the battery pack (40A) will be consumed first.

In the control circuit (18) of the example, the first battery pack (40A) is electrically connected to the first connection terminal (13), and the second battery pack (40B) is connected to the second connection terminal (38). Power is supplied from the second battery pack (40B) to the drive source (3) after substantially all the power of the first battery pack (40A) is consumed in the state of being electrically connected to the second battery pack (40B). Can be started. In this configuration, the power of the first battery pack (40A) is consumed first, so that the first battery is consumed after substantially all the power of the first battery pack (40A) is consumed. The handheld work machine can be operated with the pack (40A) removed from the main body (10).

An example main body (10) has a main body case (11) in which a drive source (3) is housed, and a battery mounting portion (12) has a first battery pack (40A) of the main body case (11). The body case (11) may have a lid (14) capable of opening and closing the opening (12a), including an opening (12a) provided in the body case (11) for accommodation inside. In this configuration, even when the first battery pack (40A) is not mounted, the first connection terminal (13) of the battery mounting portion (12) may be exposed to the outside of the main body (10). It is suppressed.

An example of a handheld working machine further includes a first grip portion (15) and a second grip portion (30) provided on the main body (10) apart from each other, and the battery mounting portion (12) is provided. It may be provided at a position between the first grip portion (15) and the second grip portion (30). In this configuration, the user can support the weight of the first battery pack (40A) substantially evenly with both hands.

The second connection terminal (38) may be provided directly below the second grip portion (30) in a state where the main body (10) is placed on a horizontal plane with the bottom surface facing down. In this configuration, the second connection terminal (38) may be protected by the second grip portion (30) located directly above the second connection terminal (38).

The second connection terminal (38) is tilted upward from the base end on the main body (10) side toward the tip in a state where the main body (10) is placed on a horizontal plane with the bottom surface facing down. You may be. In this configuration, when the main body (10) is placed on the ground or the like, the cable (51) connected to the second connection terminal (38) is prevented from coming into contact with the ground or the like and being damaged.

According to the handheld working machine of the present invention, even if a plurality of battery packs are used, the increase in weight can be suppressed.

It is a perspective view which shows the hand-held work machine which concerns on an example. It is a figure which shows the state which the hand-held work machine which concerns on one example is used. It is a side view which shows the hand-held work machine which concerns on an example. It is a block diagram which shows the electric power control system. It is a figure which shows an example of the operation panel. It is a flow chart which shows the operation flow of the hand-held work machine.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the description of the drawings, the same elements are designated by the same reference numerals, and duplicate description will be omitted. Further, in the present specification, the terms indicating the directions such as up / down, front / back, left / right, etc. shall indicate the direction with respect to the worker who uses the handheld work machine. The front (blade side in this example) for the operator is defined as "front".

The hedge trimmer 1, which is an example of a handheld working machine, has a motor 3 (see FIG. 4) which is a drive source operated by electric power, a main body 10 having a gear case 5 connected to the motor 3, and a hedge trimmer 1 protruding forward from the gear case 5. It has a blade 20 provided as described above.

The main body 10 includes a main body case 11, a front handle (first grip portion) 15, and a rear handle (second grip portion) 30. At least the motor 3 is housed inside the main body case 11. As shown in FIG. 1, the motor 3 is a main body side battery pack (first battery pack) 40A mounted on the main body 10, or an external battery pack (first battery pack) connected to the main body 10 via an electric cable 51. 2 battery pack) Operates with the power supplied from 40B. The rotational motion of the motor 3 is transmitted to the blade 20 as a reciprocating motion by a gear (power transmission mechanism) in the gear case 5 attached to the lower part of the main body case 11. The main body side battery pack 40A and the external battery pack 40B may be the same product based on the same standard. Therefore, when the main body side battery pack 40A and the external battery pack 40B are not distinguished in the following description, the main body side battery pack 40A and the external battery pack 40B are collectively referred to as the battery pack 40.

The battery pack 40 is a rechargeable power storage device. For example, the battery pack 40 has a resin housing 41 and a storage cell such as a lithium ion secondary battery housed inside the housing 41. Further, the battery pack 40 may have a protection circuit for control that protects the storage cell from overcharging and overdischarging. In one example, the battery pack 40 has a substantially rectangular parallelepiped shape. An electrode 43 for external connection is provided on the outer surface of the battery pack 40. For example, the battery pack 40 may be charged by a dedicated adapter. As an example, the battery pack 40 may have a guide for sliding mounting to the adapter.

The blade 20 has a guide 21 provided so as to project in front of the gear case 5, and an upper blade 23 and a lower blade which are attached along the guide 21 and project in the left-right direction and have a large number of blades arranged side by side in the front-rear direction. Includes 25 and. The upper blade 23 and the lower blade 25 of the blade 20 are configured to reciprocate by converting the rotational motion of the motor 3 into a reciprocating motion and transmitting it to cut objects to be cut such as hedges and plants.

The battery pack 40A on the main body side is electrically connected to the motor 3 by being mounted on the battery mounting portion 12 provided in the main body case 11. An example body-side battery pack 40A may be housed inside the body case 11. For example, the main body case 11 has an opening 12a inside as a battery mounting portion 12 for accommodating the main body side battery pack 40A. An example opening 12a is formed in the upper part of the main body case 11. The space 12s in the opening 12a has a size that can accommodate the battery pack 40 that is supposed to be used in the hedge trimmer 1. The main body side battery pack 40A can be electrically connected to the motor 3 in a state of being housed in the space 12s in the opening 12a. That is, a connection terminal (first connection terminal) 13 (see FIG. 4) that can be electrically connected to the battery pack 40 is provided in the opening 12a. For example, by engaging the battery pack 40 with a guide (not shown) arranged in the space 12s in the opening 12a, the connection terminal 13 in the opening 12a and the electrode 43 of the battery pack 40 are electrically connected. To.

The main body case 11 of the illustrated example has a cover (cover body) 14 capable of opening and closing the opening 12a. The cover 14 has a peripheral edge along the peripheral edge of the opening 12a, and is provided so that the opening 12a can be closed. The cover 14 of one example has a curved plate shape forming a convex shape toward the upper side. As shown in FIG. 1, the battery pack 40 can be attached to and detached from the battery mounting portion 12 while the cover 14 is open. The cover 14 can close the opening 12a in a state where the battery pack 40 is mounted in the battery mounting portion 12, that is, in a state where the battery pack 40 is housed in the space 12s in the opening 12a. The cover 14 may be provided integrally with the main body case 11. For example, the front end of the cover 14 may be connected to the main body case 11 by a hinge structure. Further, the cover 14 may be detachable from the main body case 11.

The front handle 15 is, for example, a portion held by one hand of a worker using the hedge trimmer 1 (see FIG. 2). An example front handle 15 has an inverted U shape in the front portion of the main body case 11 that connects the lower portions of the left and right side surfaces. The front handle 15 is connected to the main body case 11 at a position in front of the space in which the main body side battery pack 40A is accommodated. In the illustrated example, the front handle 15 is arranged on the upper side of the gear case 5. When viewed from the side surface, the position where the front handle 15 is connected overlaps with the position where the motor 3 is arranged.

The rear handle 30 is, for example, a portion held by the other hand of the operator using the hedge trimmer 1. Since the rear handle 30 of the example is provided so as to be rotatable with respect to the main body case 11, unless otherwise specified, the structural description of the rear handle 30 is a standard in which the rear handle 30 is not rotated. Based on the state of being in position.

As shown in FIG. 3, the rear handle 30 may have a substantially rectangular annular shape when viewed from the side surface. The rear handle 30 includes an upper grip portion 31, a lower grip portion 33, and a connecting portion 35. The upper grip portion 31 is mainly intended to be gripped by the user. The upper grip portion 31 constitutes an upper portion of the rear handle 30, and extends in the front-rear direction and extends downward from the rear end. The lower grip portion 33 extends forward from the rear end portion of the upper grip portion 31. The connection portion 35 includes a mounting portion 36 that connects the rear handle 30 and the main body case 11. The connecting portion 35 constitutes a front side portion of the rear handle 30, and extends along the vertical direction so as to connect the front end of the upper grip portion 31 and the front end of the lower grip portion 33.

The mounting portion 36 projects forward from the center of the connecting portion 35 in the vertical direction. The mounting portion 36 of one example has a hollow tubular shape and has an axis along the front-rear direction. The mounting portion 36 is rotatably supported on the rear end surface of the main body case 11. That is, the rear handle 30 can be rotated with respect to the main body case 11 with the mounting portion 36 along the front-rear direction as a rotation axis. The space 12s in which the battery pack 40A on the main body side is accommodated is located between the front handle 15 and the rear handle 30 arranged apart from each other in the front-rear direction (predetermined direction).

A cable mounting portion 37 is provided at the lower end of the connecting portion 35. The cable mounting portion 37 includes a connection terminal 38 (second connection terminal). The connection terminal 38 has a substantially cylindrical outer shape. An example connection terminal 38 projects rearward from the lower end of the connection portion 35 when the hedge trimmer 1 is viewed from the side surface, and the main body case 11 is placed on a horizontal plane with the bottom surface 11a facing down. , It is inclined so as to face upward from the base end on the connection portion 35 side (main body case 11 side) toward the tip. In this case, for example, the inclination angle θ of the connection terminal 38 with respect to the horizontal plane may be 0 ° to 15 °, and may be about 10 ° as an example. In the illustrated example, the lower grip portion 33 is tilted with the same tilt angle as the connection terminal 38. Further, the connection terminal 38 is provided directly below the lower grip portion 33 of the rear handle 30 in a state where the main body case 11 is placed on a horizontal surface with the bottom surface 11a facing down. For example, the width of the lower grip portion 33 in the left-right direction may be larger than the width of the connection terminal 38 in the left-right direction.

The connection terminal 38 is electrically connected to the motor 3 via a wiring that passes through the inside of the mounting portion 36. An electric cable 51 electrically connected to the external battery pack 40B that supplies electric power to the motor 3 may be electrically connected to the connection terminal 38. For example, the external battery pack 40B may be housed in a storage case 50 to which the electric cable 51 is connected. The storage case 50 has a bottomed rectangular tubular housing 53. The housing 53 may be formed of, for example, a resin or the like.

A first band 54 for preventing the housed battery pack 40 from falling off is provided on the peripheral edge of the opening 53a formed in the upper part of the housing 53. The first band 54 has a band shape. For example, one end of the first band 54 is fixed to one of the pair of facing side surfaces of the housing 53, and the other end of the first band 54 is removable from the other of the pair of facing side surfaces of the housing 53. May be. When both ends of the first band 54 are fixed to the housing 53 in a state where the battery pack 40 is housed in the housing 53, the first band 54 crossing the opening 53a suppresses the battery pack 40 from falling off.

Further, on one side surface of the housing 53, a second band 55 connected to the other side surface facing the other side surface through the bottom surface 53b is provided. The second band 55 has a band shape. For example, one end of the second band 55 may be fixed to the housing, and the other end of the second band 55 may be removable from the housing 53. As shown in FIG. 2, by passing the waist belt or the like of the harness H worn by the user between the second band and the housing 53, the user holds the housing 53 in a state where both hands can be used. can.

Inside the housing 53, a connection terminal 57 (see FIG. 4) that can be connected to the electrode 43 of the battery pack 40 is provided. For example, by engaging the battery pack 40 with a guide (not shown) formed in the housing 53, the connection terminal 57 in the housing 53 and the electrode 43 of the battery pack 40 are electrically connected. ..

The connection terminal 57 is connected to one end of the electric cable 51. The electric cable 51 may be fixed to the housing 53 or may be detachably configured. The other end of the electric cable 51 may be a connector 51a configured to be detachably attached to the connection terminal 38. In the illustrated example, the connection terminal 38 is a male type, and the connector 51a of the electric cable 51 is a female type. For example, the connection terminal 38 and the connector 51a are each threaded so as to correspond to each other, and the electric cable 51 can be prevented from coming off by rotating the connector 51a side.

A trigger 32 is arranged below the upper grip portion 31. The trigger 32 is for operating the motor 3. Further, a safety lever 39 is arranged on the upper side of the upper grip portion 31. The safety lever 39 is for enabling the operation of the trigger 32.

An operation panel 60 is provided at the upper end of the connection portion 35, that is, at the front end of the upper grip portion 31. As shown in FIG. 5, the operation panel 60 of an example is provided with a rotary lever 61, a main power switch 62, a speed switch 63, an energizing lamp 65, and a speed lamp 66. The rotary lever 61 may regulate the rotation of the rear handle 30. For example, when the user rotates the rear handle 30, the user rotates the rear handle 30 while operating (for example, pressing) the rotary lever 61. The main power switch 62 is a switch for activating the operating system of the hedge trimmer 1. When the main power switch 62 is pressed and the energization by the battery pack 40 is confirmed, the energization lamp 65 lights up. The speed switch 63 is a switch that changes the reciprocating speed of the blade 20. For example, by switching the speed switch 63, the reciprocating speed of the blade 20 can be switched to either low speed, medium speed, or high speed. The speed lamp 66 is a lamp for notifying the user whether the speed of the blade 20 is low, medium speed, or high speed.

An example hedge trimmer 1 has a control circuit 18 for drive control. The control circuit 18 is electrically connected to each of the main power switch 62, the speed switch 63, the trigger 32, and the connection terminal 38 via a wiring cord passing through the mounting portion 36. Further, the control circuit 18 is electrically connected to each of the connection terminal 13 and the motor 3 via a wiring cord arranged in the main body case 11. Although not shown, the energization lamp 65 and the speed lamp 66 may also be connected to the control circuit 18.

The control circuit 18 is arranged, for example, in the main body case 11. The control circuit 18 includes an arithmetic unit, a storage device, an interface, and the like, and executes a predetermined control by executing a program stored in the storage device. An example control circuit 18 may include an MCU (Micro Control Unit).

The control circuit 18 electrically connects the main body side battery pack 40A connected via the connection terminal 13 and the external battery pack 40B connected via the connection terminals 38 and 57 to the motor 3 in parallel. is doing. The control circuit 18 rotates the motor 3 in response to the signal input from the trigger 32, for example, when the trigger 32 is pulled by the user. The rotation speed of the motor 3 is controlled by the control circuit 18 based on the signal input from the speed switch 63. The control circuit 18 switches the lighting of the speed lamp 66 based on the signal input from the speed switch 63. Further, the control circuit 18 detects the voltages of the main body side battery pack 40A and the external battery pack 40B, and when a voltage equal to or higher than a predetermined threshold value is confirmed, determines that the motor 3 can be driven and energizes. Turn on the lamp 65.

The control circuit 18 of the example selectively switches between the electric power from the main body side battery pack 40A and the electric power from the external battery pack 40B and supplies the electric power to the motor 3. For example, the control circuit 18 supplies electric power to the motor 3 via the connection terminal 38 when the electric power supplied from the connection terminal 13 is equal to or less than a predetermined threshold value. In one example, in the control circuit 18, the main body side battery pack 40A is electrically connected to the first connection terminal, and the main body side battery pack 40B is electrically connected to the connection terminal 38. After substantially all of the power of 40 A has been consumed, the power supply from the second battery pack to the motor 3 is started.

Hereinafter, an example of control by the control circuit 18 will be described with reference to the flowchart of FIG. In the hedge trimmer 1 as an example, first, the main body side battery pack 40A is attached to the battery mounting portion 12 by an operator, and the connector of the electric cable 51 electrically connected to the external battery pack 40B is attached to the electric cable 51 mounting portion. It will be installed. By connecting the battery pack 40 to the hedge trimmer 1, the control circuit 18 is put into a standby state (step S1). For example, the standby state may be a state in which the MCU included in the control circuit 18 is activated. The electric power for activating the MCU is supplied by either the main body side battery pack 40A or the external battery pack 40B.

In the standby state of step S1, the control circuit 18 executes the check of the calculator of the battery pack 40. In one example, the control circuit 18 determines whether or not the voltage of the battery pack 40A on the main body side is normal (step S2). For example, the control circuit 18 measures the voltage of the main body side battery pack 40A, and determines whether or not the motor 3 can be operated by the main body side battery pack 40A based on the measurement result. As an example, the control circuit 18 may determine whether or not the motor 3 can operate by calculating the remaining battery level of the battery pack 40A on the main body side from the measured voltage. Further, the control circuit 18 may determine whether or not the operation of the motor 3 is possible by comparing the measured voltage with a predetermined threshold value.

In step S2, when it is determined that the voltage of the main body side battery pack 40A is normal, that is, the motor 3 can be operated by the main body side battery pack 40A, is the main power switch 62 pressed in the control circuit 18? It is determined whether or not (step S3). When the main power switch 62 is pressed, the control circuit 18 activates the entire control circuit 18, that is, all systems related to the operation of the hedge trimmer 1 (step S4). In this case, the control circuit 18 selects the battery pack 40A on the main body side as the power supply source of the motor 3. If the main power switch 62 is not pressed, the control method of the example returns to step S1 again.

In step S2, when the voltage of the main body side battery pack 40A is not normal, that is, when the voltage of the main body side battery pack 40A is low and it is determined that the motor 3 cannot operate due to the voltage of the main body side battery pack 40A, the control circuit. Reference numeral 18 determines whether or not the voltage of the external battery pack 40B is normal (step S5). The determination method of the external battery pack 40B may be the same as the determination method of the main body side battery pack 40A in step S2.

In step S5, when the voltage of the external battery pack 40B is not normal, that is, when the voltage of the external battery pack 40B is low and it is determined that the motor 3 cannot operate due to the voltage of the external battery pack 40B, the main body Since the motor 3 cannot be operated by either the side battery pack 40A or the external battery pack 40B, the control circuit 18 ends the standby state.

In step S5, when it is determined that the voltage of the external battery pack 40B is normal, that is, the motor 3 can be operated by the external battery pack 40B, is the main power switch 62 pressed in the control circuit 18? It is determined whether or not (step S6). When the main power switch 62 is pressed, the control circuit 18 activates the entire control circuit 18, that is, all systems related to the operation of the hedge trimmer 1 (step S7). In this case, the control circuit 18 selects the external battery pack 40B as the power supply source of the motor 3. If the main power switch 62 is not pressed, the control method of the example returns to step S1 again.

Subsequently, the control circuit 18 determines whether or not the main body side battery pack 40A and the external battery pack 40B are normal (step S8). For example, the control circuit 18 determines whether or not there is an abnormality such as overload or overtemperature for each of the main body side battery pack 40A and the external battery pack 40B. Such a determination can be performed, for example, based on the signals input from the respective protection circuits of the main body side battery pack 40A and the external battery pack 40B.

If it is determined in step S8 that there is an abnormality in any of the battery packs 40, the control circuit 18 terminates the operating system. In this case, for example, the main power switch 62 is turned off by the operator, and the battery pack 40 is replaced.

When it is determined in step S8 that the battery pack 40 is normal, the control circuit 18 determines whether or not the drive signal from the trigger 32 is input (step S9). If the drive signal from the trigger 32 has not been input for a certain period of time, the control circuit 18 terminates the operating system. On the other hand, when the drive signal from the trigger 32 is input, the control circuit 18 determines whether the voltage of the battery pack 40 selected as the power supply source of the motor 3 is low (step S10). The determination method of the battery pack 40 may be the same as the determination method of the main body side battery pack 40A in step S2.

If it is determined in step S10 that the voltage of the battery pack 40 is not low, that is, if the battery pack 40 has enough battery power to operate the motor 3, the control circuit 18 inputs from the speed switch 63. The motor 3 is operated according to the speed (step S11). As a result, the upper blade 23 and the lower blade 25 reciprocate symmetrically in the front-rear direction under the power of the motor 3.

When it is determined in step S10 that the voltage of the battery pack 40 is low, the control circuit 18 determines whether or not the currently selected battery pack 40 is the main body side battery pack 40A (step S12). When it is determined that the currently selected battery pack 40 is the main body side battery pack 40A, the control circuit 18 switches the power supply source of the motor 3 to the external battery pack 40B (step S13), and returns to step S9. ..

On the other hand, when it is determined that the currently selected battery pack 40 is the external battery pack 40B, the battery remaining enough to operate the motor 3 in both the main body side battery pack 40A and the external battery pack 40B. Since there is no quantity, the control circuit 18 stops the motor 3 (step S14). In this case, for example, the main power switch 62 is turned off by the operator, and the removed battery pack 40 is charged.

As described above, the handheld working machine of an example is a main body 10 having a motor 3 operated by electric power and a battery mounting portion 12 provided on the main body 10, and is a main body side battery pack that supplies electric power to the motor 3. A battery mounting portion 12 having a connection terminal 13 to which 40A is mounted and electrically connected to the main body side battery pack 40A, and a cable mounting portion 37 provided on the main body 10 to supply electric power to the motor 3. A cable mounting portion 37 having a connection terminal 38 to which an electric cable 51 electrically connected to the attached battery pack 40B is electrically connected is provided.

In the above-mentioned hand-held work machine, since power is supplied to the motor 3 by the main body side battery pack 40A and the external battery pack 40B, for example, the hand-held work machine is used for a long time as compared with the case where only one battery pack is provided. Can be driven over. Since the external battery pack 40B is connected to the connection terminal 38 of the cable mounting portion 37 via the electric cable 51 without being mounted on the main body 10, the external battery pack 40B is connected to the main body 10 when the operator uses the handheld work machine. On the other hand, the weight of the external battery pack 40B is not added. Therefore, when using a plurality of battery packs, it is possible to suppress an increase in the weight of the handheld work machine.

The connection terminal 13 and the connection terminal 38 of the example may be electrically connected in parallel to the motor 3. In this configuration, the handheld working machine can be operated even when only one of the main body side battery pack 40A and the external battery pack 40B is connected.

An example handheld working machine may further include a control circuit 18 that selectively switches between power from the main body side battery pack 40A and power from the external battery pack 40B and supplies it to the motor 3. In this configuration, power can be supplied from either battery pack while both the main body side battery pack 40A and the external battery pack 40B are connected.

An example control circuit 18 may supply electric power to the motor 3 via the connection terminal 38 when the electric power supplied from the connection terminal 13 is equal to or less than a predetermined threshold value. In this configuration, the power of the main body side battery pack 40A is consumed first in the state where the main body side battery pack 40A and the external battery pack 40B are connected to the connection terminal 13 and the connection terminal 38, respectively.

In the control circuit 18 of an example, in a state where the battery pack 40A on the main body side is electrically connected to the connection terminal 13 and the external battery pack 40B is electrically connected to the connection terminal 38, the power of the battery pack 40A on the main body side is supplied. Power can be started from the external battery pack 40B to the motor 3 after substantially all of it has been consumed. In this configuration, the power of the main body side battery pack 40A is consumed first, so that the main body side battery pack 40A is removed from the main body 10 after substantially all the power of the main body side battery pack 40A is consumed. The handheld work machine can be operated while it is still in use.

The main body 10 of one example has a main body case 11 in which the motor 3 is housed, and the battery mounting portion 12 has an opening provided in the main body case 11 for accommodating the main body side battery pack 40A inside the main body case 11. Including 12a, the body case 11 may have a cover 14 capable of opening and closing the opening 12a. In this configuration, even when the battery pack 40A on the main body side is not mounted, the connection terminal 13 of the battery mounting portion 12 is suppressed from being exposed to the outside of the main body 10.

An example of a handheld working machine further includes a front handle 15 and a rear handle 30 provided on the main body 10 apart from each other, and a battery mounting portion 12 is provided at a position between the front handle 15 and the rear handle 30. Can be. In this configuration, the user can support the weight of the battery pack 40A on the main body side substantially evenly with both hands.

The connection terminal 38 may be provided directly below the rear handle 30 in a state where the main body 10 is placed on a horizontal surface with the bottom surface facing down. For example, the connection terminal 38 may be provided at another location such as the rear end of the rear handle 30, but in that case, the connection terminal 38 is likely to be damaged by contact or the like. In the above configuration, the connection terminal 38 may be protected by the rear handle 30 arranged directly above the connection terminal 38.

The connection terminal 38 may be inclined so as to face upward from the base end on the main body 10 side toward the tip in a state where the main body 10 is placed on a horizontal plane with the bottom surface facing down. In this configuration, when the main body 10 is placed on the ground or the like, the electric cable 51 connected to the connection terminal 38 is prevented from coming into contact with the ground or the like and being damaged.

Although the embodiments of the present invention have been described above, the specific embodiments of the present invention are not limited to the above examples. For example, in the above embodiment, the hedge trimmer has been described as an example, but the present invention may be applied to another handheld working machine different from the hedge trimmer. The present invention includes a drive source such as a motor powered by electricity, and is applicable to any working machine that is used while being held by the user. For example, the present invention is applied to a chainsaw, a brush cutter, a blower, or the like. May be applied.

1 ... Hedge trimmer (handheld work machine), 10 ... Main body, 11 ... Main body case, 12 ... Battery mounting part, 12a ... Opening, 13 ... Connection terminal (first connection terminal), 14 ... Cover (lid), 18 ... Control circuit, 15 ... Front handle (first grip), 30 ... Rear handle (second grip), 37 ... Cable mounting part, 38 ... Connection terminal (second connection terminal), 40A ... Main body Side battery pack (first battery pack), 40B ... External battery pack (second battery pack), 51 ... Electric cable (cable).

Claims (9)

A main body (10) having a drive source (3) operated by electric power,
A battery mounting unit (12) provided in the main body (10), wherein a first battery pack (40A) for supplying electric power to the drive source (3) is mounted, and the first battery pack (40A) is mounted. ), The battery mounting portion (12) having a first connection terminal (13) electrically connected to the battery mounting portion (12).
A cable (51) that is a cable mounting portion (37) provided in the main body (10) and is electrically connected to a second battery pack (40B) that supplies electric power to the drive source (3). A handheld working machine comprising the cable mounting portion (37) having a second connection terminal (38) electrically connected. The handheld operation according to claim 1, wherein the first connection terminal (13) and the second connection terminal (38) are electrically connected in parallel with the drive source (3). Machine. A control circuit (18) for selectively switching between the electric power from the first battery pack (40A) and the electric power from the second battery pack (40B) and supplying the electric power to the drive source (3) is further provided. The handheld working machine according to claim 2. The control circuit (18) is the drive source (38) via the second connection terminal (38) when the power supplied from the first connection terminal (13) is equal to or less than a predetermined threshold value. The handheld working machine according to claim 3, which supplies electric power to 3). In the control circuit (18), the first battery pack (40A) is electrically connected to the first connection terminal (13), and the second battery pack (40B) is connected to the second connection terminal. In the state of being electrically connected to (38), after substantially all the electric power of the first battery pack (40A) is consumed, the drive source (3) is connected to the second battery pack (40B). ), The handheld working machine according to claim 3. The main body (10) has a main body case (11) in which the drive source (3) is housed.
The battery mounting portion (12) includes an opening (12a) provided in the main body case (11) for accommodating the first battery pack (40A) inside the main body case (11).
The handheld working machine according to any one of claims 1 to 5, wherein the main body case (11) has a lid (14) capable of opening and closing the opening (12a). The main body (10) includes a first grip portion (15) and a second grip portion (30) arranged apart from each other in a predetermined direction.
The battery mounting portion (12) is provided at a position between the first grip portion (15) and the second grip portion (30) in the predetermined direction, claims 1 to 6. The handheld working machine described in any one of the above. The second connection terminal (38) is provided directly under the second grip portion (30) in a state where the main body (10) is placed on a horizontal plane with the bottom surface facing down. The handheld working machine according to 7. The second connection terminal (38) faces upward from the base end on the main body (10) side toward the tip in a state where the main body (10) is placed on a horizontal plane with the bottom surface facing down. The handheld working machine according to claim 8, which is inclined to.

Images