WO2014119131A1

WO2014119131A1 - Rechargeable cutting tool

Info

Publication number: WO2014119131A1
Application number: PCT/JP2013/082943
Authority: WO
Inventors: 健司安部; 厚志加納
Original assignee: 株式会社マキタ
Priority date: 2013-02-01
Filing date: 2013-12-09
Publication date: 2014-08-07
Also published as: DE112013006571T5; JP2014148015A; JP6084474B2

Abstract

The rechargeable cutting tool is a cutting tool (1) in which two of the widely popular 18 V batteries (B1, B2) are installed in series to drive an electric motor (11) that has the total voltage of the batteries as the voltage rating.

Description

Rechargeable cutting tool

The present invention relates to a rechargeable cutting tool used for cutting wood, for example, and mainly relates to a hand-held cutting tool.

A technique related to a hand-held cutting tool that uses a rechargeable battery as a power source is disclosed in Japanese Patent Application Laid-Open No. 2010-201598. This type of cutting tool called a portable marnoko includes a base that comes into contact with the upper surface of the cutting material, and a cutting machine body that is supported on the upper surface side of the base. The main body of the cutting machine is an electric motor as a drive source, a rotating circular cutting blade, a main body case that mainly covers the upper half circumference of the cutting blade, and an openable movable cover that mainly covers the lower half circumference of the cutting blade. The handle part which a person holds is provided. The cutting process is performed by moving the cutting tool in the cutting progress direction by the user holding the handle portion and cutting the cutting blade protruding toward the lower surface side of the base into the cutting material.

Not only this type of cutting tool but also a power tool battery with an output voltage of 18V or 36V, for example, is provided. 18V output battery (18V battery) is mainly used for hand-held tools with relatively small and small output models, and larger for relatively large (high output) cutting tools that require higher output. A 36V output battery (36V battery) is used.

However, since a conventional high-power cutting tool that uses a 36V battery as a dedicated power source cannot use an 18V battery, the user must prepare a separate 36V battery dedicated to a high-power cutting tool. However, there is a problem that the cost is high, and there is room for further improving the handling of a high-power cutting tool.

Therefore, an object of the present invention is to further improve the convenience and handling of the cutting tool by making it possible to use a low output battery as a power source for a relatively high output cutting tool.

The present invention includes a base to be brought into contact with a cutting material, a cutting machine body supported on the upper surface side of the base, and the cutting machine body uses an electric motor as a drive source and a circular cutting blade rotated by the electric motor. A cutting tool that has a handle portion that is gripped by a person and cuts a portion protruding from the lower surface side of the base of the cutting blade into a cutting material, and a rechargeable battery as a power source in the cutting machine body Is a cutting tool provided with a plurality of battery attachment parts for attaching the battery in an exposed state that is removable and visible from the outside.

According to the present invention, it is possible to use a high-power cutting tool by attaching two low-power batteries, thereby making it possible to effectively use the low-power battery and to improve the convenience of the high-power cutting tool. The handleability can be further enhanced.

A more preferable embodiment of the present invention is a cutting tool in which the two battery mounting portions are configured to be capable of mounting two batteries side by side in the cutting progress direction. According to this embodiment, the two batteries are attached in a side-by-side state in which the longitudinal direction intersects the cutting progress direction and the short direction is aligned with the cutting progress direction. Thus, it is possible to make the cutting tool compact with respect to the cutting progress direction of the cutting tool attached to the battery.

A more preferable embodiment of the present invention is a cutting tool in which the battery mounting portion is configured to be mounted with the shortest side of the rectangular parallelepiped battery in the vertical direction. According to this embodiment, two batteries can be mounted in the up-down direction in a compact manner, whereby the down-direction of the cutting tool in a battery-mounted state can be made compact.

A more preferable form of the present invention is a cutting tool capable of attaching a battery in a region below the handle portion. According to this aspect, when the user grips the handle portion, the two batteries do not get in the way, and a good gripping property of the handle portion can be ensured.

A more preferable embodiment of the present invention is a cutting tool in which the mounting direction of the battery mounting portion is matched with the direction perpendicular to the surface of the cutting blade. According to this embodiment, the battery can be attached from the side of the cutting blade, and can be removed by moving the battery to the side of the cutting blade. When the cutting tool is placed on the floor, the battery can be easily attached to and detached from the battery attachment portion.

A more preferable embodiment of the present invention is a cutting tool in which the attachment direction of the battery attachment portion is at least 45 ° with respect to the handle portion. According to this aspect, when the handle portion is gripped with one hand and the battery is gripped with the other hand, the battery can be easily attached to and detached from the battery attachment portion.

In a more preferred form of the present invention, the cutting machine main body is supported so that the position of the cutting machine can be changed up and down. A cutting depth adjusting mechanism that can be adjusted is provided, and the cutting tool includes the cutting depth adjusting mechanism between the cutting blade and the handle portion. According to this aspect, it is possible to overcome the fact that the lower portion of the handle portion is enlarged due to the provision of a plurality of batteries, making it difficult to optimally arrange the depth guide.

1 is an overall front view of a cutting tool according to an embodiment of the present invention. It is the top view which looked at the cutting tool which concerns on embodiment of this invention from the arrow (II) direction in FIG. It is the rear view which looked at the cutting tool which concerns on embodiment of this invention from the arrow (III) direction in FIG. It is the bottom view which looked at the cutting tool which concerns on embodiment of this invention from the arrow (IV) direction in FIG. This figure has shown the state which removed two batteries. In this figure, the base is omitted. It is a longitudinal cross-sectional view of the cutting tool which concerns on embodiment of this invention, Comprising: It is the (V)-(V) sectional view taken on the line in FIG. It is a perspective view of a battery unit.

Next, an embodiment of the present invention will be described with reference to FIGS. FIG. 1 shows a rechargeable cutting tool 1 according to this embodiment. This cutting tool 1 is a hand-held cutting tool, also called a portable maroon saw, and includes a rectangular flat plate-shaped base 2 to be brought into contact with the upper surface of the cutting material M and a cutting machine body 10 supported on the upper surface side of the base 2. ing.

The cutting machine main body 10 includes an electric motor 11 as a drive source and a circular cutting blade 12 rotated by the electric motor 11. A range of the upper half circumference of the cutting blade 12 is covered with a blade case 13. The range of the lower half circumference of the cutting blade 12 is covered with a movable cover 14. The movable cover 14 is provided so as to be openable and closable along the periphery of the cutting blade 12. The movable cover 14 is brought into contact with the end surface of the cutting material M as the cutting process proceeds and rotated in the clockwise direction in FIG. 1, and is opened manually by holding the release lever 14a provided at the upper end thereof. Can be opened and closed.

2 and 5, the electric motor 11 is attached to the left side surface (back surface) of the blade case 13 through the reduction gear portion 15. The motor axis J of the electric motor 11 is orthogonal to the cutting progress direction. An output shaft (spindle 16) of the reduction gear unit 15 is protruded into the blade case 13, and a cutting blade 12 is attached to the protruding portion.

A loop-shaped handle portion 20 that is gripped by the user is provided on the electric motor 11. 1, the user is positioned on the left side (right side in FIG. 3) of the cutting tool 1 and on the rear side in the cutting progress direction, and grips the handle portion 20.

As shown in FIG. 3, the handle portion 20 combines a front vertical portion 21, a gripping portion 22 inclined in a downward direction from the upper portion of the vertical portion 21, and a lower portion of the vertical portion 21 and a rear portion of the gripping portion 22. The base portion 23 has a generally chevron shape. The vertical grip 21 is provided with a front grip 24 protruding forward. A trigger-type switch lever 22 a is provided on the lower surface of the front end of the grip portion 22. When the switch lever 22a is pulled upward with the fingertip of the hand gripping the grip portion 22, the electric motor 11 is activated and the cutting blade 12 is rotated. Above the switch lever 22a, a lock-off lever 22b for locking the non-operating state of the switch lever 22a is provided. The left and right end portions of the lock-off lever 22b protrude from the left and right side portions of the grip portion 22, and can be operated from either the left or right side. By depressing the lock-off lever 22b downward, the locked state is released and the switch lever 22a can be pulled. Inadvertent misoperation can be prevented by such a lock-off function.

The cutting machine body 10 is supported so as to be able to tilt up and down with respect to the base 2 via a vertical tilting support shaft 17. By changing the vertical tilting position of the cutting machine main body 10 with respect to the base 2, the protruding amount of the cutting blade 12 to the lower surface side of the base 2 can be changed, whereby the cutting blade 12 cuts into the cutting material M. The depth can be adjusted.

As shown in FIG. 2, in the space between the handle portion 20 and the blade case 13 and behind the reduction gear portion 15, a cutting depth for adjusting the cutting depth of the cutting blade 12 with respect to the cutting material M is provided. An adjustment mechanism 18 is provided. The cut depth adjusting mechanism 18 includes a depth guide 18a provided on the upper surface of the base 2 so as to extend long upward, and a fixing screw 18b for fixing the blade case 13 to the depth guide 18a. Although the reference numeral 18aa is attached in FIG. 5, the depth guide 18a is formed with a guide groove hole 18aa along an arc centered on the above-described vertically tilting support shaft 17. A fixing screw 18b is inserted into the guide groove hole 18aa. The fixing screw 18b is fastened to the back surface of the blade case 13. A fixing lever 18c for rotating operation is attached to the fixing screw 18b. By holding the fixing lever 18c and rotating the fixing screw 18b by a certain angle, the fixing screw 18b can be tightened to the back surface of the blade case 13 and loosened. By tightening the fixing screw 18b, the vertical tilting position of the cutting machine body 10 with respect to the base 2 is fixed, and accordingly, the protruding amount of the cutting blade 12 to the lower surface side of the base 2 (cutting depth with respect to the cutting material M) is fixed. . The state shown in FIGS. 1 and 3 shows a state in which the cutting machine main body 10 is fixed at the lowest tilting position with respect to the base 2 and the cutting depth of the cutting blade 12 is adjusted to the maximum. The cutting depth of the cutting blade 12 can be reduced by moving the cutting machine body 10 to the tilting position above the base 2 as compared with the state shown in FIGS. 1 and 3.

A battery mounting base part 30 is provided at the rear part (user side) of the handle part 20, the rear part of the grip part 22 and the rear part of the base part 23. As shown in FIG. 4, the battery mounting base 30 is provided in a state of projecting to the rear of the electric motor 11. As shown in FIG. 3, the battery mounting base portion 30 has a substantially flat plate shape, and is provided in an inclined direction in a direction in which the handle portion 20 is displaced upward from the rear portion of the base portion 23 toward the rear. Yes. In the state where the cutting depth of the cutting blade 12 is maximized as shown in FIG. 3 by the battery mounting base portion 30 that is inclined obliquely upward toward the rear in this manner, the battery B1 on the front side is compared with the battery B1 on the front side. The rear battery B2 is attached at a position displaced further upward. As a result, even when the cutting depth is reduced by tilting the cutting machine main body 10 further upward with respect to the base 2 around the vertically tilting support shaft 17, the battery B2 on the rear side particularly has the base 2 Thus, the cutting depth adjusting mechanism 18 of the cutting tool 1 functions reliably.

As shown in FIG. 4, two battery mounting portions 31 and 32 are provided on the lower surface of the battery mounting base portion 30. Slide attachment batteries B1 and B2 are attached to the two battery attachment portions 31 and 32, respectively.

As shown in FIG. 6, the two batteries B1 and B2 are 18 V output lithium ion batteries each containing a plurality of battery cells in a battery case, and are removed from the cutting tool 1 and charged by a separately prepared charger. By doing so, it can be used repeatedly as a power source. Both batteries B1, B2 are provided with a pair of left and right rail parts B1b, B1c, B2b, B2c on the upper surface thereof. Positive and negative connection terminals B1d, B1e, B2d, and B2e are provided between the left and right rail portions B1b and B1c, and between B2b and B2c, respectively. Connectors B1f and B2f for transmitting and receiving control signals to and from the charger are provided between the positive and negative connection terminals B1d and B1e and between the positive and negative connection terminals B2d and B2e.

In addition, lock claws B1g and B2g for locking the attachment state of the batteries B1 and B2 with respect to the battery attachment portions 31 and 32 can be moved up and down at the end of the upper surface of the batteries B1 and B2 in the removal direction. Is provided.

In this embodiment, two 18V batteries B1 and B2 are connected in series and used as a 36V battery. Therefore, the electric motor 11 is operated by a 36V power source output from two 18V batteries B1 and B2 connected in series.

As shown in FIG. 4, the battery attachment portions 31 and 32 are provided with a pair of

rail portions

31a, 31a, 32a, and 32a and positive and negative connection terminals 31b, 31c, 32b, and 32c, respectively, in the front-rear direction. The rails B1b, B1c, B2b, and B2c of the batteries B1 and B2 are engaged with the pair of front and

rear rail portions

31a, 31a, 32a, and 32a, respectively, and the batteries B1 and B2 can be slid and mechanically attached. Conversely, it can be removed. Further, the positive and negative connection terminals 31b, 31c, 32b and 32c are connected to the positive and negative connection terminals B1d, B1e, B2d and B2e of the batteries B1 and B2, respectively, so that the batteries B1 and B2 are electrically connected. .

Further, claw engagement portions 31d and 32d for engaging the lock claws B1g and B2g provided on the batteries B1 and B2 and locking the attachment state are provided on the left side portions of both the battery attachment portions 31 and 32. ing.

4 and 6, the batteries B1 and B2 are moved downward (attachment direction) in FIG. 4 with respect to both battery mounting portions 31 and 32, thereby causing the batteries B1 and B2 to move. It can attach to the battery attachment parts 31 and 32, respectively. Conversely, the batteries B1 and B2 can be removed from the battery attachment portions 31 and 32 by moving the batteries B1 and B2 upward (in the removal direction) in FIG. .

As shown in FIG. 3, on the front surface in the direction of removal of both batteries B1 and B2, unlocking for releasing the engagement state of the lock claws B1g and B2g with the claw engagement portions 31d and 32d of the battery attachment portions 31 and 32 Buttons B1a and B2a are provided.

As shown in FIG. 6, assuming that the outer dimensions of the batteries B1 and B2 are the length L, the width W, and the height H in the longitudinal direction, both the batteries B1 and B2 have a length L> width W> height H It has a generally rectangular parallelepiped shape that is related. Both the batteries B1 and B2 are attached to the battery mounting base 30 in a side-by-side state in which the longitudinal direction is aligned in the left-right direction and aligned in the cutting progress direction. Moreover, as shown in FIG. 3, in the attachment state with respect to the battery attachment base part 30, both battery B1, B2 is attached in the direction which turned up and down the height direction which is the shortest side (height H).

The attachment and detachment directions of the two batteries B1 and B2 with respect to the battery attachment portions 31 and 32 coincide with the direction orthogonal to the surface direction of the cutting blade 12 (surface direction). The direction is parallel to the axial direction.

The electric power of the batteries B1 and B2 attached to the battery attachment portions 31 and 32 is supplied to the electric motor 11 mainly through the controller C including a power supply circuit. As shown in FIG. 5, the controller C is accommodated in the base portion 23 of the handle portion 20. The inside of the base part 23 is communicated with the inside of the electric motor 11. Therefore, the motor cooling air drawn through the intake ports 11a to 11a (see FIG. 3) provided on the rear surface of the motor housing due to the rotation of the cooling fan 11b of the electric motor 11 as shown by the outlined arrows in FIG. Then, it is introduced into the base part 23 as it is and used as cooling air for cooling the controller C. As shown in FIG. 3, exhaust ports 23a to 23a are provided on the left side of the base 23 as viewed from the user. The motor cooling air introduced into the base unit 23 is exhausted to the outside through the exhaust ports 23a to 23a.

According to the rechargeable cutting tool 1 according to the present embodiment configured as described above, two high-output 18V batteries B1 and B2 are attached, and a high-output using the electric motor 11 having a rated voltage of 36V as a drive source. The cutting tool 1 can be used, whereby the low output 18V batteries B1 and B2 can be used effectively, and the convenience and handling of the high output cutting tool 1 can be further enhanced. In particular, it is possible to divert 18V batteries that are currently widely used, including spare batteries, etc., so that it is possible to use the high-power cutting tool 1 with 36V specifications without purchasing expensive 36V batteries separately. A remarkable effect can be obtained in that the cost of the cutting work can be reduced and the workability can be improved.

In addition, the two battery mounting portions 31 and 32 have two batteries B1 and B2 whose longitudinal direction (length L direction) intersects the cutting progress direction and whose short direction (width W direction) is set. It is configured to be mounted side by side along the cutting direction. Accordingly, the two batteries B1 and B2 can be compactly attached in the cutting progress direction, and as a result, the cutting tool 1 in the battery-attached state can be made compact in the cutting progress direction. Furthermore, since the two batteries B1 and B2 are configured to be mounted with the height H direction, which is the shortest side, in the vertical direction, the two batteries B1 and B2 can be compactly mounted in the vertical direction. This makes it possible to make the cutting tool 1 in a battery-mounted state compact in the vertical direction.

Moreover, according to the illustrated cutting tool 1, since it is the structure which attaches battery B1, B2 to the area | region below the handle | steering-wheel part 20, when a user hold | grips the handle | steering-wheel part 20, two battery B1, B2 becomes obstructive. Therefore, it is possible to ensure a good gripping property of the handle portion 20 and thus a good handling property of the cutting tool 1, and an electric motor that is relatively heavy when the user grips the grip portion 22. Since the motor 11 and the batteries B1 and B2 are positioned on the front side and the rear side of the gripped hand, the weight balance when gripped is taken so that the handle portion 20 can be gripped, and thus the cutting tool 1 is easy to use. Workability and handleability can be improved.

Further, the attachment and detachment directions of the two batteries B1 and B2 with respect to the battery attachment portions 31 and 32 coincide with the direction (surface normal direction) perpendicular to the surface direction of the cutting blade 12, and accordingly, the motor axis line J and The direction is parallel to the axial direction of the spindle 16. For this reason, the batteries B1 and B2 can be moved from the side of the cutting blade 12 to be attached to the battery mounting portions 31 and 32. Conversely, the batteries B1 and B2 can be moved to the side of the cutting blade 12 and removed. Therefore, the attachment and detachment operations of the batteries B1 and B2 with respect to the battery attachment portions 31 and 32 can be performed quickly and easily.

Moreover, according to the illustrated cutting tool 1, the cutting machine main body 10 is supported so that the position of the cutting machine body 10 can be changed up and down, and the amount of protrusion of the cutting blade 12 to the lower surface side of the base 2 is changed. A cutting depth adjusting mechanism 18 that can adjust the cutting depth of the cutting blade 12 is provided. The depth guide 18 a and the fixing lever 18 c that mainly constitute the cutting depth adjusting mechanism 18 are disposed between the blade case 13 that covers the cutting blade 12 and the handle portion 20. For this reason, it is possible to prevent malfunction due to adhesion of cutting powder and the like while effectively utilizing an empty space as compared with a configuration in which this type of adjustment mechanism (mainly depth guide) is arranged in the blade case, In this respect, the durability and maintainability of the cutting tool 1 can be improved.

Various modifications can be made to the embodiment described above. For example, the configuration in which the attachment and removal directions of the batteries B1 and B2 are made coincident with the direction perpendicular to the direction perpendicular to the surface of the cutting blade 12 is illustrated. It is good also as a structure which moves in the direction which goes down toward and attaches. According to this configuration, the batteries B1 and B2 can be attached to the battery attachment portion by sliding obliquely downward, and conversely, the batteries B1 and B2 can be removed from the battery attachment portion by sliding obliquely upward. Therefore, the attachment and removal of the batteries B1 and B2 with respect to the battery attachment portion can be performed quickly and easily.

In consideration of handling at the time of attachment and removal of the batteries B1 and B2, in addition to a configuration in which the attachment and removal directions are exemplified as a perpendicular direction (inclination angle of 0 °), the orientation is within 45 ° with respect to the perpendicular direction. It can be set as the structure attached and removed along the direction which inclines with an angle.

In addition, although the configuration in which the two batteries B1 and B2 are attached side by side before and after the cutting progress direction is illustrated, the configuration may be such that the longitudinal direction is attached in a vertical alignment state along the cutting progress direction. Moreover, although the structure which makes it the rear part of the handle | steering-wheel part 20 was illustrated about the site | part to attach, it can also be changed into other parts, such as the front part of the handle | steering-wheel part 20, and a right-and-left side part.

In addition, the configuration in which two 18V specification batteries B1 and B2 are attached and the cutting tool 1 having 36V output is operated is illustrated. However, for example, a plurality of other output voltage batteries such as 14.4V specification are attached to obtain the total voltage. It can be used as a power source of an electric motor having a rated voltage. In short, it is possible to effectively use a plurality of batteries owned by the user as spare batteries, etc. by installing a plurality of more widely used batteries and using them as a power source for an electric motor whose total voltage is the rated voltage. Therefore, the cutting tool 1 with higher output can be used, and thereby, the cutting tool with higher output can be popularized while suppressing the battery cost.

Claims

A base to be brought into contact with the cutting material, and a cutting machine main body supported on the upper surface side of the base, the cutting machine main body being an electric motor as a driving source, a circular cutting blade rotated by the electric motor, and a user A cutting tool that includes a handle portion to be gripped, and performs a cutting process by cutting a portion protruding to the lower surface side of the base of the cutting blade into the cutting material,
A cutting tool comprising a plurality of battery attachment portions for attaching a rechargeable battery as a power supply to the cutting machine main body in an exposed state that is removable and visible from the outside.
2. The cutting tool according to claim 1, wherein the two battery mounting portions are configured to be capable of mounting two batteries side by side in a cutting progress direction.
3. The cutting tool according to claim 1, wherein the battery attachment portion is configured to be attached with a shortest side of a rectangular parallelepiped battery in an up and down direction.
The cutting tool according to any one of claims 1 to 3, wherein a battery can be attached to a region below the handle portion.
The cutting tool according to any one of claims 1 to 4, wherein the mounting direction of the battery mounting portion is aligned with the direction perpendicular to the surface of the cutting blade.
6. The cutting tool according to claim 1, wherein the attachment direction of the battery attachment portion is at least 45 ° with respect to the handle portion.
The cutting tool according to any one of claims 1 to 6, wherein the cutting machine main body is supported so as to be vertically changeable with respect to the base, and the cutting blade protrudes toward the lower surface of the base. A cutting depth adjusting mechanism that can adjust the cutting depth of the cutting blade with respect to the cutting material by changing the amount, and the cutting depth adjusting mechanism is provided between the cutting blade and the handle portion. Cutting tool provided.