Portable cutting machine

Abstract

To provide a portable cutter capable of securing space around the little finger of a hand holding a grip without providing the grip at a high position. The device includes a battery mounting section (20) to which a battery pack (40) can be attached and detached. The battery mounting section (20) includes a connection terminal (25a) for electrically connecting the battery pack (40), and is disposed behind the battery pack (40) when viewed in the cutting direction (D1) of the workpiece with the battery pack (40) attached.

Description

[Technical field]

[0001] The present invention relates to a portable cutting machine, and more particularly to a portable cutting machine having a distinctive mounting portion for a battery pack. [Background technology]

[0002] These types of portable cutting machines can be broadly divided into two types depending on the type of power source they use: those that use AC power sources and those that use rechargeable battery packs. Of these, those that use AC power sources have the disadvantage that they are difficult to handle due to the power cable, and cannot be used when there is no power source nearby. Also, with the recent improvement in the performance of lithium-ion batteries, the number of machines that use rechargeable battery packs as a power source is increasing.

[0003] On the other hand, portable cutters that are used with a battery pack inevitably become larger in size due to the battery pack, and if the battery pack is made higher voltage to bring its performance closer to that of portable cutters that use AC power, the size of the battery pack will also increase. If the overall length of the machine in the cutting direction (length in the cutting direction) increases due to an increase in the size of the battery pack, a problem occurs in that when cutting corners in work such as replacing floors, there are large areas that the saw blade cannot reach, and the amount of uncut material increases.

[0004] In order to solve these problems, for example, Patent Document 1 discloses a structure in which the battery, electric motor, and saw blade are arranged more centrally, thereby shortening the overall length of the machine. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2010-201598 A Summary of the Invention [Problem to be solved by the invention]

[0006] However, in the conventional configuration as described above, the battery mounting section is provided on the upper part of the battery pack, and the grip is provided further above the battery mounting section. At this time, the connection terminals and wiring for electrically connecting the battery pack are accommodated in the battery mounting section, in other words, the space for accommodating the connection terminals and wiring is provided in the lower part of the grip. In particular, when the connection terminals of the battery mounting section are arranged close to the lower part of the grip, the space for routing the wiring is reduced, and as a result, the space for holding the grip between the grip and the battery mounting section is reduced. In other words, when the grip is held, the space around the little finger of the hand holding the grip is narrowed, which may impair the operability of the operator. In order to avoid this, the grip is provided at a high position, but if the grip is raised, the grip is separated from the center of gravity, which reduces operability, and the machine becomes larger and harder to handle.

[0007] SUMMARY OF THE PRESENT EMBODIMENT An object of the present invention is to provide a portable cutting machine that can ensure space around the little finger of the hand holding the grip, without the need to mount the grip at a high position. [Means for solving the problem]

[0008] The present invention has been made to solve the above-mentioned problems and has the following features.

[0009] The invention described in claim 1 is a portable cutting machine that cuts a workpiece by rotating a saw blade with a motor, comprising: a battery mounting section to which a battery pack can be attached and detached; A board on which a connection terminal for electrically connecting the battery pack is mounted, and a grip handle that can be held by an operator. and the battery mounting section is The cutting tool is provided with a rail for slidably guiding the battery pack and a terminal cover for covering the board, the board being disposed inside the battery mounting section so as to be substantially perpendicular to the workpiece, and the rear end of the grip handle being connected to the upper surface of the battery mounting section. It is characterized by:

[0010] The invention described in claim 2 has the following features in addition to those of the invention described in claim 1: The rod-shaped portion of the grip handle for the operator to grasp is entirely located above the base plate. It is characterized by:

[0011] The invention described in claim 3 has, in addition to the features of the invention described in claim 1 or 2, The rail guides the battery pack so that the battery pack slides parallel to the substrate. It is characterized by:

[0012] The invention described in claim 4 has the following features in addition to the features of the invention described in any one of claims 1 to 3: The battery mounting portion is formed behind the motor and is integrally formed with a motor housing that houses the motor. It is characterized by:

[0013] The invention described in claim 5 has the following features in addition to the features of the invention described in any one of claims 1 to 4: The substrate is disposed in front of the battery pack when viewed in the cutting direction of the workpiece with the battery pack attached. It is characterized by:

[0014]

[0015] Effect of the Invention

[0016] The invention described in claim 1 is as described above, and the battery mounting portion is a connection terminal for electrically connecting the battery pack. A board with Equipped with The circuit board is disposed inside the battery mounting section so as to be approximately perpendicular to the workpiece, and the rear end of the grip handle is connected to the upper surface of the battery mounting section. According to this configuration, G It is possible to secure space around the little finger of the hand holding the lip.

[0017]

[0018]

[0019]

[0020]

[0021]

[0022] [Brief description of the drawings]

[0023] [Figure 1] FIG. 2 is a right side view of the portable cutting machine. [Diagram 2] FIG. 2 is a plan view of the portable cutting machine. [Diagram 3] FIG. 2 is a rear view of the portable cutting machine. [Figure 4] FIG. 2 is a right side view of the portable cutting machine with the battery pack removed. [Diagram 5] FIG. 2 is a plan view of the portable cutting machine with the battery pack removed. [Figure 6] FIG. 2 is a rear view of the portable cutting machine with the battery pack removed. [Figure 7] FIG. 2 is a right side view of the portable cutting machine with a portion of the housing removed. [Figure 8] FIG. 1 is a perspective view of a portable cutting machine with a portion of the housing removed. [Figure 9] FIG. 2A is a perspective view of the portable cutting machine with the battery pack removed, and FIG. 2B is a perspective view of the battery pack. [Figure 10] FIG. 13A is a right side view and FIG. 13B is a perspective view of a portable cutting machine with adjustable cutting depth. [Figure 11] FIG. 13 is a right side view of the portable cutting machine according to a modified example. [Figure 12] FIG. 13 is a right side view of the portable cutting machine with the battery pack removed, according to a modified example. [Figure 13] FIG. 1 is a right side view of a conventional portable cutting machine with a portion of the housing removed. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0024] An embodiment of the present invention will be described with reference to the drawings. "Top" refers to the upward direction of the portable cutting machine 10 when the base 30 is placed on a horizontally placed workpiece (unless otherwise specified, the state in which the cutting depth of the saw blade 13 is at its maximum), and "bottom" refers to the opposite direction to "top." Additionally, in the following description, "front" refers to the forward direction of the portable cutting machine 10 as seen in the cutting direction D1 of the workpiece, and "rear" refers to the opposite direction to "front."

[0025] The portable cutting machine 10 of this embodiment cuts materials such as wood or steel using a circular saw blade 13 that rotates around a saw blade axis (not shown), and includes a cutting machine body 11 that rotatably supports the saw blade 13, as shown in Figures 1 to 6, etc.

[0026] The cutting machine body 11 is equipped with a motor housing 12 that houses a motor (not shown). When the motor is operated, the saw blade 13 is rotated, making it possible to cut the material to be cut. The motor is driven by a battery pack 40 that is detachably attached to a battery mounting section 20 provided at the rear of the cutting machine body 11.

[0027] A grip 16 is provided on the upper part of the cutting machine body 11 substantially parallel to the cutting direction D1 of the material to be cut, and the motor rotates when a trigger 17 provided on the inside of the grip 16 is pulled. The front end of the grip 16 is integrally connected to the cutting machine body 11 near the motor housing 12, and the rear end of the grip 16 is integrally connected to the rear end of the cutting machine body 11. The grip 16 is inclined so that it gradually becomes lower toward the rear as viewed in the cutting direction D1 of the material to be cut when the cutting depth (described later) is maximized. Also, as shown in FIG. 1 etc., the grip 16 is disposed above the battery mounting part 20 in a side view (in other words, the grip 16 is disposed on the opposite side of the base 30 described later as viewed from the battery mounting part 20).

[0028] A base 30 is attached to the bottom of the cutting machine body 11. The base 30 is a metal plate-like member that comes into contact with the workpiece, and is formed so that the workpiece can be cut below the base 30 by exposing the bottom of the saw blade 13 from a cutting edge 31 formed therethrough.

[0029] The front end of the base 30 is rotatably supported by a rotating shaft 19 provided at the front of the cutting machine body 11. By rotating the base 30 about the rotating shaft 19, it is possible to adjust the amount of protrusion of the saw blade 13 from the bottom surface of the base 30. In this way, by adjusting the amount of protrusion of the saw blade 13, it is possible to adjust the cutting depth of the workpiece.

[0030] The cutting depth can be adjusted by operating the cutting depth adjustment lever 18. The cutting depth adjustment lever 18 is for locking or unlocking the rotation of the base 30 and the cutting machine body 11. When adjusting the cutting depth, first rotate the cutting depth adjustment lever 18 to release the fixation between the base 30 and the cutting machine body 11. In this state, the base 30 is rotated about the rotation shaft 19, and once the desired cutting depth is set, the cutting depth adjustment lever 18 is rotated in the fixing direction to fix the base 30 and the cutting machine body 11.

[0031] The upper half of the saw blade 13 from the base 30 is covered by a saw cover 14 for safety. The lower part of the saw blade 13 exposed from the cutting edge 31 of the base 30 is covered by an arc-shaped lower guard 15. The lower guard 15 is attached so as to be rotatable about the rotation axis of the saw blade 13.

[0032] The battery mounting section 20 is a section that detachably engages with the battery pack 40, and has a board 25 disposed inside as shown in Figures 4, 7, 8, etc. This board 25 is provided with a connection terminal 25a for electrically connecting the battery pack 40. In other words, when the battery pack 40 is mounted on the battery mounting section 20, the battery pack 40 and the cutting machine body 11 are electrically connected via the connection terminal 25a.

[0033] As shown in Figs. 1 and 2, the battery mounting section 20 is disposed behind the battery pack 40 (opposite to the cutting direction D1 of the material to be cut) when viewed in the cutting direction D1 of the material to be cut with the battery pack 40 attached. In this embodiment, as shown in Fig. 7 and other figures, the board 25 is disposed so as to be approximately perpendicular to the base 30 when the cutting depth is maximized, and the approximately perpendicular surface of the board 25 faces the rear surface of the battery pack 40. By disposing in this manner, the battery mounting section 20 serves as a rear protection section that protects the rear of the battery pack 40 attached to the battery mounting section 20. In addition, the battery mounting section 20 does not exist between the battery pack 40 and the rear end of the grip 16, so that the position of the grip 16 can be set as low as possible.

[0034] As shown in FIG. 5, FIG. 9(a) and the like, the battery mounting portion 20 includes a terminal cover portion 20a, a protruding portion 20b, a latch receiving portion 20c and a rail 20d.

[0035] As shown in Fig. 9(a) and other figures, the terminal cover part 20a is a part that covers the board 25. Inside this terminal cover part 20a, a space is formed for accommodating the wiring cord 25b connected to the rear surface (back surface) of the board 25. In this embodiment, as shown in Fig. 7, the upper end of the board 25 is disposed to face the rear end of the grip 16, so that the wiring cord 25b is wired to the switch of the trigger 17 and the motor board via the inside of the grip 16. This eliminates the need for space for wiring below the grip 16, and allows the position of the grip 16 to be set as low as possible.

[0036] In the conventional structure, as shown in Fig. 13, the battery mounting section 20 is located between the battery pack 40 and the rear end of the grip 16, and space is required for wiring below the grip 16, so the position of the grip 16 must be set high. However, according to this embodiment, such problems do not occur.

[0037] As shown in Fig. 3, a display unit 26 for displaying the status of the portable cutting machine 10 or the battery pack 40 is provided on the rear surface of the terminal cover 20a, which is a part of the battery mounting unit 20 serving as the rear protective unit. By providing the display unit 26 in such a position, the display unit 26 is provided in a position directly facing the user, thereby improving the visibility of the display unit 26. Specifically, the display unit 26 is easy to see even when the cutting depth is set to the maximum as shown in Fig. 3, and is also easy to see even when the cutting depth is set to a shallow depth as shown in Fig. 10.

[0038] The content displayed on the display unit 26 is not particularly limited, but as an example, it is possible to display the remaining charge of the battery pack 40 or to display errors in the portable cutting machine 10 or the battery pack 40.

[0039] The protrusion 20b is a portion that is provided so as to extend laterally from the terminal cover portion 20a. By providing this protrusion 20b, a wide area of ​​the rear surface of the battery pack 40 is covered, and a latch receiving portion 20c, which will be described later, can be disposed thereon.

[0040] 9(a), the latch receiving portion 20c is a groove having a substantially V-shaped cross section provided on the rear surface side of the protruding portion 20b. The latch receiving portion 20c is provided to engage with the latch 43 of the battery pack 40.

[0041] The rails 20d are for slidably guiding the battery pack 40, and are provided along the mounting direction of the battery pack 40. In this embodiment, as shown in Fig. 9(a), two rails 20d are provided on the upper and lower sides inside the battery mounting section 20.

[0042] The battery pack 40 that can be attached to the battery attachment section 20 described above is box-shaped as shown in Fig. 9(b), and one surface of a case 41 that houses a plurality of battery cells serves as an attachment surface to the cutting machine body 11. A terminal (not shown) for supplying electricity from the battery cells to the outside is arranged on the attachment surface. This terminal is covered by a terminal cover section 45 that has a slit. When the battery pack 40 is attached to the cutting machine body 11, the connection terminal 25a on the cutting machine body 11 side fits through the slit of the terminal cover section 45, and the terminal of the battery pack 40 and the connection terminal 25a on the cutting machine body 11 side are electrically connected.

[0043] A latch 43 that can be protruded from and retracted into the case 41 is provided on the mounting surface of the battery pack 40. The latch 43 is biased by a spring so as to protrude from the case 41 in a natural state.

[0044] Furthermore, a latch operation part 44 for operating the latch 43 is provided on the front surface of the battery pack 40 as viewed in the removal direction D2 (see FIG. 2, etc.). This latch operation part 44 is a button used when removing the battery pack 40 from the battery attachment part 20. In this embodiment, by pressing in this latch operation part 44, the biasing force of the spring that biases the latch 43 in the protruding direction is released.

[0045] Further, a guide rail portion 42 that engages with the rail 20d of the battery mounting section 20 described above is provided on the side surface of the battery pack 40 as viewed in the removal direction D2. The guide rail portion 42 engages with the rail 20d, so that the battery pack 40 can be slid relative to the battery mounting section 20 and removed. At this time, as shown in Fig. 2, the removal direction D2 of the battery pack 40 is perpendicular to the cutting direction D1 of the workpiece in a plan view. In other words, the battery mounting section 20 can be detached by sliding the battery pack 40 from the side as viewed in the cutting direction D1 of the workpiece.

[0046] In this way, when the battery pack 40 is slid all the way into the battery mounting part 20, the battery pack 40 and the cutting machine body 11 are electrically connected, and the latch 43 engages with the latch receiving part 20c, thereby fixing the battery pack 40 to the battery mounting part 20. In addition, by pressing in the latch operating part 44, the engagement between the latch receiving part 20c and the latch 43 is released, and the battery pack 40 can be removed from the battery mounting part 20.

[0047] When the battery pack 40 is attached to the battery attachment section 20, the battery pack 40 is offset relative to the grip 16, as shown in Fig. 2. That is, when viewed in the longitudinal direction of the grip 16, the battery pack 40 is offset to the opposite side of the saw blade 13 (saw cover 14). By offsetting the battery pack 40 in this way, the grip 16 and the saw blade 13 (saw cover 14) can be disposed close to each other, thereby increasing the density of the machine and realizing a compact design.

[0048] 4 and 9(a), the portable cutting machine 10 according to this embodiment includes an upper cover part 22 that covers an upper part of the battery pack 40 attached to the battery mounting part 20, and a side cover part 23 that covers a side part of the battery pack 40 attached to the battery mounting part 20 on the saw blade 13 side. As shown in Fig. 2, the upper cover part 22 is provided so that the boundary surface between the battery mounting part 20 and the battery pack 40 is not exposed at least in a plan view. In addition, the side cover part 23 is a wall provided at the end when the battery pack 40 is attached, and covers almost the entire surface (e.g., preferably 80% or more) of the side surface of the battery pack 40 to prevent cutting chips from entering from the saw blade 13 side.

[0049] By providing these upper cover portion 22 and side cover portion 23, the battery pack 40 attached to the battery mounting portion 20 is configured so that three sides, namely the upper surface, the rear surface, and the side surface on the saw blade 13 side, are covered, while three sides, namely the lower surface, the front surface, and the side surface on the saw blade 13 side, are exposed. However, since the base 30 is provided on the lower surface and the motor housing 12 is provided on the front surface, what is actually exposed is only the side surface on the saw blade 13 side that needs to be opened to attach and detach the battery pack 40.

[0050] As described above, the battery attachment section 20 includes the connection terminal 25a for electrically connecting the battery pack 40, and is disposed behind the battery pack 40 when viewed in the cutting direction D1 of the workpiece with the battery pack 40 attached. With this configuration, the battery attachment section 20 is not provided between the grip 16 and the battery pack 40, so the battery attachment section 20 does not press on the space below the grip 16. Therefore, it is possible to secure space around the little finger of the hand holding the grip 16 without increasing the height of the grip 16.

[0051] Furthermore, since the rear of the battery pack 40 is protected by the battery mounting section 20 (rear protection section), the battery pack 40 can be protected even if the machine is dropped from the rear.

[0052] Furthermore, because the battery pack 40 can be slid from the side as viewed in the cutting direction D1 of the material to be cut and therefore can be detached, even if the overall length of the battery pack 40 increases due to a higher voltage, the battery pack 40 can be lengthened in the removal direction D2 of the battery pack 40 (direction perpendicular to the cutting direction D1 of the material to be cut), and this does not affect the overall length (length in the cutting direction) of the portable cutting machine 10. In other words, even if the battery pack 40 becomes larger, the overall length of the portable cutting machine 10 can be kept short, and problems such as an increase in uncut portions do not occur.

[0053] Also, an upper cover part 22 is provided to cover the upper part of the battery pack 40 attached to the battery mounting part 20. That is, in this embodiment, since the battery mounting part 20 is not provided above the battery pack 40, there is a risk of chips falling on the battery pack 40 from above, but by providing the upper cover part 22, it is possible to prevent chips from entering. Also, since the upper cover part 22 ensures rigidity, it is possible to compensate for the lack of strength caused by the battery mounting part 20 not being provided above the battery pack 40.

[0054] Also, a side cover part 23 is provided to cover the side part of the battery pack 40 attached to the battery mounting part 20 on the side of the saw blade 13. With such a configuration, it is possible to prevent chips from entering from the side, and the side cover part 23 can ensure rigidity.

[0055] Furthermore, a display unit 26 for displaying the status of the portable cutting machine 10 or the battery pack 40 is provided on the rear surface of the battery attachment unit 20 (rear protection unit). With this configuration, the display unit 26 is provided in a position directly facing the operator holding the grip 16, making the display unit 26 easy to view. In particular, even when the cutting depth is increased and the angle of the cutting machine body 11 changes, the display unit 26 can be easily viewed.

[0056] Furthermore, the board 25 on which the connection terminals 25a are mounted is disposed approximately perpendicular to the cutting direction of the workpiece. With this configuration, the board 25 is disposed approximately perpendicularly, so the thickness of the board 25 does not affect the height direction of the machine. In other words, the board 25 does not press on the space below the grip 16, so that a space can be secured around the little finger of the hand holding the grip 16 without making the grip 16 taller.

[0057] In the above embodiment, the battery mounting section 20 is disposed at the rear of the battery pack 40, but this is not limiting, and the battery mounting section 20 may be disposed at the front of the battery pack 40 as shown in Fig. 11 and Fig. 12. In this case, the rear of the battery pack 40 may be open, or a rear protection section that protects the rear of the battery pack 40 may be provided. [Explanation of symbols]

[0058] 10 Portable cutting machine 11 Cutting machine body 12 Motor housing 13 Saw blade 14 SoCar 15 Lower Guard 16 Grip 17 Trigger 18 Cutting depth adjustment lever 19 Rotating shaft 20 Battery mounting section (rear protection section) 20a Terminal cover 20b Protrusion 20c Latch receiving part 20d rail 22 Upper cover part 23 Side cover part 25 Substrate 25a Connection terminal 25b Wiring cord 26 Display section 30 Base 31 Blade mouth 40 Battery Pack 41 cases 42 Guide rail section 43 Latch 44 Latch operation part 45 Terminal cover D1 Cutting direction of the workpiece D2 Battery pack removal direction

Claims

1. A portable cutting machine that cuts a workpiece by rotating a saw blade with a motor, a battery attachment section to which a battery pack can be attached and detached; a substrate having a surface mounted with connection terminals for electrically connecting the battery pack; A grip handle that can be held by an operator; Equipped with the battery mounting portion includes a rail for slidably guiding the battery pack and a terminal cover portion for covering the board; The substrate is disposed inside the battery mounting portion so as to be substantially perpendicular to the workpiece, The battery mounting section is provided contiguous to a lower rear end of the grip handle, and the battery packs can be mounted side-by-side in the cutting direction on the base plate.

2. 2. The portable cutting machine according to claim 1, wherein the entire rod-shaped portion of the grip handle for being gripped by an operator is positioned above the base plate.

3. 3. The portable cutting machine of claim 1, wherein the rail guides the battery pack so that the battery pack slides parallel to the base plate.

4. 4. The portable cutting machine according to claim 1, wherein the battery mounting portion is formed behind the motor and is integral with a motor housing that houses the motor.

5. The portable cutting machine according to any one of claims 1 to 4, wherein the base plate is positioned in front of the battery pack when viewed in the cutting direction of the workpiece with the battery pack attached.

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