Portable base for band saw

Abstract

The invention provides a portable base for a band saw. A base for a portable band saw for mounting the portable band saw is provided with: a base; a mounting arm which is supported on the base so as to be capable of swinging about a swinging fulcrum and on which the portable band saw is mounted; and the resetting device enables the mounting arm to automatically reset to the top dead center. Therefore, the burden of a user of the portable band saw is reduced.

Description

Technical Field

[0001] The technology disclosed in this specification relates to a base for a portable band saw. Background Technology

[0002] In the technical field of portable band saws, a base for mounting a portable band saw, as disclosed in Patent Document 1, is known. The portable band saw is oscillatingly mounted on the base in a manner that allows it to move between the upper and lower dead centers.

[0003] [Existing Technical Documents] [Patent Literature]

[0004] Patent Document 1: Japanese Patent Publication No. 2023-009616 Summary of the Invention

[0005] [The technical problem that the invention aims to solve]

[0006] Moving the portable band saw to its upper stop point increases the user's workload when they need to lift it manually. This increased workload can reduce work efficiency and extend work time.

[0007] The base has a baffle to support the workpiece and a vise to fix the workpiece. A technology is needed that can stably fix the workpiece and is easy to operate.

[0008] The purpose of the technology disclosed in this manual is to reduce the burden on users of portable band saws.

[0009] The purpose of the technology disclosed in this specification is to stably fix the workpiece being cut and to make it easy to operate.

[0010] [Technical solutions used to solve technical problems]

[0011] This specification discloses a base for mounting a portable band saw. The base for the portable band saw may have a base, a mounting arm, and a reset device, wherein the mounting arm is swayably supported on the base with a pivot point as the center, and is used to mount the portable band saw; the reset device automatically resets the mounting arm to the upper stop point.

[0012] This specification discloses a base for mounting a portable band saw. The portable band saw base may include a base, a baffle, and a vise, wherein the baffle is disposed on the base and has an abutment surface for supporting the workpiece being cut; the vise is disposed on the base for fixing the workpiece being cut. The abutment surface may face the opposite side of the user. The vise may be positioned on the opposite side of the abutment surface from the user. The vise may have a clamping bar, an abutment member, and an operating member, wherein the abutment member is connected to one end of the clamping bar and contacts the workpiece being cut; the operating member is connected to the other end of the clamping bar. The abutment member may be positioned closer to the abutment surface than the operating member.

[0013] [Invention Effects]

[0014] The technology disclosed in this manual can reduce the burden on users of portable band saws.

[0015] The technology disclosed in this specification can stably fix the workpiece being cut and ensure good operability. Attached Figure Description

[0016] Figure 1 This is a perspective view of the band saw involved in the implementation method, shown from the upper left front side.

[0017] Figure 2 This is a diagram of the band saw involved in the implementation method, viewed from the right side.

[0018] Figure 3 This is an exploded view of the band saw involved in the implementation method, viewed from the right side.

[0019] Figure 4 This is a perspective view of the band saw involved in the implementation method, shown from the upper left rear side.

[0020] Figure 5 This is a perspective view of the base with the band saw mounted on it, shown from the upper right front side of the embodiment.

[0021] Figure 6 This is a perspective view of the base with the band saw mounted on it, shown from the upper left rear side of the embodiment.

[0022] Figure 7 This is a perspective view of the base with the band saw mounted on it, shown from the lower left rear side of the embodiment.

[0023] Figure 8 This is a diagram showing the base with the band saw mounted on it, viewed from the left side, in the implementation method.

[0024] Figure 9 This is a diagram showing the base with the band saw mounted on it, viewed from the right side, in the implementation method.

[0025] Figure 10 This is a diagram showing the base with the band saw mounted on it, viewed from the front, according to the embodiment.

[0026] Figure 11 This is a diagram showing the base with the band saw mounted on it, viewed from the rear.

[0027] Figure 12 This is a diagram showing the base with the band saw mounted on it, viewed from above, according to the embodiment.

[0028] Figure 13 This is a diagram showing the base with the band saw mounted on it, viewed from the left side, in the implementation method.

[0029] Figure 14 This is a diagram showing the base with the band saw mounted on it, viewed from the right side, in the implementation method.

[0030] Figure 15 This is a diagram showing the base with the band saw mounted on it, viewed from the front, according to the embodiment.

[0031] Figure 16 This is a diagram showing the base with the band saw mounted on it, viewed from the rear.

[0032] Figure 17 This is a diagram showing the base with the band saw mounted on it, viewed from above, according to the embodiment.

[0033] Figure 18 This is a cross-sectional view showing a portion of the base involved in the implementation method.

[0034] Figure 19 This is a cross-sectional view showing a portion of the base involved in the implementation method.

[0035] Figure 20 This is a cross-sectional view showing a portion of the base involved in the implementation method.

[0036] Figure 21 This is a perspective view of the base involved in the embodiment, shown from the upper right front side.

[0037] Figure 22 This is a perspective view of the base involved in the embodiment, shown from the upper left rear side.

[0038] Figure 23 This is an exploded perspective view of the base involved in the embodiment, shown from the upper left rear side.

[0039] Figure 24 This is a perspective view of the band saw involved in the implementation method, shown from the upper left front side.

[0040] Figure 25 This is a diagram of the band saw involved in the implementation method, viewed from the right side.

[0041] Figure 26 This is an exploded view of the band saw involved in the implementation method, viewed from the right side.

[0042] Figure 27 This is a perspective view of the band saw involved in the implementation method, shown from the upper left rear side.

[0043] Figure 28 This is a perspective view of the base with the band saw mounted on it, shown from the upper right front side of the embodiment.

[0044] Figure 29 This is a perspective view of the base with the band saw mounted on it, shown from the upper left rear side of the embodiment.

[0045] Figure 30 This is a perspective view of the base with the band saw mounted on it, shown from the lower left rear side of the embodiment.

[0046] Figure 31 This is a diagram showing the base with the band saw mounted on it, viewed from the left side, in the implementation method.

[0047] Figure 32 This is a diagram showing the base with the band saw mounted on it, viewed from the right side, in the implementation method.

[0048] Figure 33 This is a diagram showing the base with the band saw mounted on it, viewed from the front, according to the embodiment.

[0049] Figure 34 This is a diagram showing the base with the band saw mounted on it, viewed from the rear.

[0050] Figure 35 This is a diagram showing the base with the band saw mounted on it, viewed from above, according to the embodiment.

[0051] Figure 36 This is a diagram showing the base with the band saw mounted on it, viewed from the left side, in the implementation method.

[0052] Figure 37 This is a diagram showing the base with the band saw mounted on it, viewed from the right side, in the implementation method.

[0053] Figure 38 This is a diagram showing the base with the band saw mounted on it, viewed from the front, according to the embodiment.

[0054] Figure 39 This is a diagram showing the base with the band saw mounted on it, viewed from the rear.

[0055] Figure 40 This is a diagram showing the base with the band saw mounted on it, viewed from above, according to the embodiment.

[0056] Figure 41 This is a cross-sectional view showing a portion of the base involved in the implementation method.

[0057] Figure 42 This is a cross-sectional view showing a portion of the base involved in the implementation method.

[0058] Figure 43 This is a cross-sectional view showing a portion of the base involved in the implementation method.

[0059] Figure 44 This is a perspective view of the base involved in the embodiment, shown from the upper right front side.

[0060] Figure 45 This is a perspective view of the base involved in the embodiment, shown from the upper left rear side.

[0061] Figure 46 This is an exploded perspective view of the base involved in the embodiment, shown from the upper left rear side.

[0062] Figure 47 This is a diagram showing a portion of the base involved in the implementation method as viewed from the left.

[0063] Figure 48 This is a cross-sectional view showing a portion of the base involved in the implementation method.

[0064] Figure 49 This is a cross-sectional view showing a portion of the base involved in the implementation method.

[0065] [Explanation of reference numerals in the attached figures] 1: Band saw (portable band saw); 2: Blade; 3: Housing; 3A: Front housing; 3B: Rear housing; 3C: Bridge; 4: Handle; 4A: Part 1; 4B: Part 2; 4C: Part 3; 5: Plate; 5A: Opening; 6: Base housing; 6A: Threaded hole; 6B: Threaded hole; 7: Cover housing; 7A: Opening; 7B: Opening; 8: Hinge; 9: Opening; 10: Screw; 11: Screw; 13: Motor; 14: Battery mounting section; 15: Drive wheel; 16: Driven wheel; 17: Tension adjustment handle; 18: Rear guide roller; 19: Front guide roller; 20: Stop plate; 20A: Slit; 20B: Slit; 21: Main switch; 22: Speed ​​dial; 23: Motor housing; 24: Battery pack; 24A: Lock release button; 25: Fixed operating handle; 25A: Rotating component; 25A1: Fixed part; 25A2: Threaded part; 25B: Screw; 25C: Stop pin; 25D: Washer; 26: Locking disconnect operating component; 27: Locking connect operating component; 28: Hook; 29: Hook support component; 30: Base (portable band saw base); 31: Base; 31A: Top plate; 31B: Side plate; 31C: Recess; 31D: Hook; 31E: Bracket; 31F: Support; 32: Bench vise; 32A: Support platform; 32A1: Block; 32A2: Plate; 32B: Bench vise plate; 32C: Screw; 32D: Knob; 32E: Screw support component; 32F: Guide rod; 32G: Rod support component; 32H: First wing screw; 32J: Second wing screw; 32K: Slot; 33: Baffle; 33A: Fixing part; 33B: Opposing part; 33C: Screw; 33D: Abutting surface; 33E: Slot; 34: Mounting arm; 34A: First arm; 34B: Second arm; 34C: Cylindrical part; 34D: Opening; 34E: Threaded hole; 34F: Protrusion; 34G: Insertion hole for lower stop; 34H: 34J: Insertion hole for top dead center; 35: First fastener; 36: Second fastener; 37: Support component; 37A: Support hole; 38: Locking component; 38A: O-ring; 39: Swing support shaft; 39A: Bolt; 39B: Nut; 39C: Sleeve; 39D: First sleeve; 39E: Second sleeve; 39F: Sleeve; 39G: Washer; 39H: Washer; 39J: O-ring; 40: Reset device; 41: Spring; 41A: Helical part; 41B: Arm; 41C: Arm; 42: Lamp; 50: Screw; AX: Swing fulcrum; La: Distance; Pa: Position; W: Workpiece to be cut. Detailed Implementation

[0066] In one or more embodiments, the portable band saw base for mounting a portable band saw may have a base, a mounting arm, and a reset device, wherein the mounting arm is swayably supported on the base with a pivot point as the center, and is used to mount the portable band saw; the reset device causes the mounting arm to automatically reset to the upper stop point.

[0067] In the above structure, when the portable band saw is moved to its upper stop point, the user does not need to lift the portable band saw themselves. Therefore, the user's workload is reduced. Furthermore, since the user does not need to lift the portable band saw themselves, it can be quickly switched to other tasks. Therefore, it can suppress the decrease in work efficiency and the extension of work time.

[0068] In one or more embodiments, the reset device may include a spring located between the base and the mounting arm. Alternatively, the mounting arm may be held at its upper stop point by the force of the spring.

[0069] In the above structure, the mounting arm automatically returns to its top dead center by the force of the spring, and its position is properly maintained at the top dead center. For example, a portable band saw can be held at the top dead center without using a locking mechanism. Examples of springs include torsion springs, coil springs, and leaf springs.

[0070] In one or more embodiments, the spring may include a torsion spring. The swing support shaft of the mounting arm may be inserted into the helical portion of the torsion spring. One arm of the torsion spring may push against the base, while the other arm of the torsion spring pushes the mounting arm to its upper limit.

[0071] The above structure ensures good assemblability when manufacturing the base for the portable band saw. Furthermore, it also ensures good workability when mounting the portable band saw onto the base.

[0072] In one or more embodiments, the portable band saw may have a drive wheel, a driven wheel, and a blade, wherein the drive wheel is rotated by a motor; the blade is mounted on the drive wheel and the driven wheel. Alternatively, the driven wheel may be positioned on the user-opposite side of the drive wheel, and the pivot point may be positioned on the user-opposite side of the drive wheel.

[0073] In the above structure, the drive wheels are positioned on the user side both when the base is installed and during normal use. The user can perform operations using the same method in both situations. "When the base is installed" refers to the state in which the portable band saw is used with the base attached. "During normal use" refers to the state in which the portable band saw is used with the base detached from the portable band saw.

[0074] In one or more embodiments, the portable band saw may have a housing and a handle, wherein the housing is used to house a drive wheel and a driven wheel; the handle is fixed to the housing. Alternatively, in a left-right direction parallel to the axis of the pivot point, the position of the blade relative to the cutting portion of the handle when the portable band saw is mounted on the base may be the same as the position of the blade relative to the cutting portion of the handle during normal use.

[0075] In the above structure, the user can perform the operation through the same procedure both when installing the base and during normal use.

[0076] In one or more embodiments, the cutting portion of the blade may be positioned on the left side of the handle, both when the base is installed and during normal use.

[0077] In the above structure, when the user holds the handle with their right hand, the user can easily visually observe the cutting part of the blade, thus suppressing the reduction in workability.

[0078] In one or more embodiments, the mounting arm may have a cylindrical portion, a first arm portion, and a second arm portion, wherein the cylindrical portion is disposed around a swing fulcrum; the first arm portion extends from the cylindrical portion toward the user side; and the second arm portion extends upward from the cylindrical portion. Alternatively, the portable band saw base may have a first fastener and a second fastener, wherein the first fastener is used to secure the first arm portion to the portable band saw; and the second fastener is used to secure the second arm portion to the portable band saw.

[0079] In the above structure, the portable band saw is stably fixed to the portable band saw base by means of the first and second fasteners that are separated from each other.

[0080] In one or more embodiments, at least one of the first fastener and the second fastener may be a wing screw.

[0081] In the above structure, the user can assemble and disassemble the portable band saw relative to its base without using tools. A wing screw is a screw that can be tightened with fingers. It is possible that both the first and second fasteners are wing screws. Alternatively, one of the first and second fasteners may be a wing screw, while the other is a regular screw that requires a tool to tighten.

[0082] In one or more embodiments, the portable band saw base may include a vise and a baffle, wherein the vise is disposed on the base for fixing the workpiece to be cut; and the baffle is disposed on the base for supporting the workpiece to be cut. Alternatively, the contact surface of the baffle facing the workpiece may be oriented opposite to the user, and the vise may be positioned on the user-opposite side of the contact surface.

[0083] In the above structure, when the workpiece moves towards the user due to the force transmitted from the cutting blade towards the user, the baffle can properly support the workpiece because its contact surface faces the opposite side of the user. Since the vise is positioned on the opposite side of the baffle's contact surface, the vise can properly secure the workpiece positioned on the baffle.

[0084] In one or more embodiments, the portable band saw base for mounting a portable band saw may have a base and a mounting arm, wherein the mounting arm is pivotally supported on the base about a pivot point for mounting the portable band saw. Alternatively, the portable band saw may have a drive wheel, a driven wheel, a blade, a housing, and a battery mounting section, wherein the drive wheel is rotated by a motor; the blade is hung on the drive wheel and the driven wheel; the housing is used to house the drive wheel and the driven wheel; and the battery mounting section is used to mount a battery pack. Alternatively, the driven wheel may be positioned opposite the user side of the drive wheel, and the pivot point may be positioned opposite the user side of the drive wheel. Alternatively, the battery pack mounted in the battery mounting section may be positioned at a position more than half the distance from the pivot point to the user-side end of the housing, closer to the user side.

[0085] In the above structure, when the portable band saw is moved to the lower stop point, the mass of the battery pack makes it easy to move the portable band saw to the lower stop point. Therefore, it reduces the burden on the user. In addition, the user can easily install and remove the battery pack relative to the battery mounting section.

[0086] In one or more embodiments, the portable band saw may have a handle that is fixed to the housing. Alternatively, a battery mounting portion may be located at the user-side end of the handle.

[0087] In the above structure, since the battery pack, which serves as a weight, is positioned at the user-side end of the handle, the user's handling feel is improved when moving the portable band saw to the lower dead center.

[0088] In one or more embodiments, the portable band saw base for mounting a portable band saw may have a base, a mounting arm, a first fastener, and a second fastener, wherein the mounting arm is pivotally supported on the base about a pivot point and has a cylindrical portion, a first arm portion, and a second arm portion, wherein the cylindrical portion is disposed around the pivot point; the first arm portion extends from the cylindrical portion toward the user side; the second arm portion extends from the cylindrical portion toward the upper side; the first fastener is used to fix the first arm portion to the portable band saw; and the second fastener is used to fix the second arm portion to the portable band saw.

[0089] In the above structure, the portable band saw is stably fixed to the portable band saw base by means of the first and second fasteners that are separated from each other.

[0090] In one or more embodiments, the portable band saw base may have a support member and a locking member, wherein the support member is fixed to the base; the locking member is movably supported on the support member and the mounting arm is fixed by being inserted into at least a portion of the first arm.

[0091] In the above structure, the position of the mounting arm can be fixed by the locking component. In addition, it can prevent the locking mechanism, which includes the support component and the locking component, from becoming too large.

[0092] In one or more embodiments, the first arm may have a lower stop insertion hole. Alternatively, the mounting arm may be fixed to the lower stop by inserting a locking member into the lower stop insertion hole.

[0093] In the above structure, the position of the mounting arm is fixed at the lower stop point by a locking component. Furthermore, it helps to prevent the locking mechanism, which includes a support component and a locking component, from becoming too large.

[0094] In one or more embodiments, the first arm may have a lower stop insertion hole and a upper stop insertion hole. Alternatively, the mounting arm may be fixed to the lower stop by inserting a locking member into the lower stop insertion hole. Or, the mounting arm may be fixed to the upper stop by inserting a locking member into the upper stop insertion hole.

[0095] In the above structure, the mounting arm is fixed at the lower and upper dead ends by locking components. By fixing the mounting arm at the upper dead end, the user can perform blade changes, for example, while the portable band saw is mounted on its base. Fixing the mounting arm at the upper dead end prevents the portable band saw from accidentally moving downwards during blade changes. Furthermore, it prevents the locking mechanism, including the support and locking components, from becoming too large.

[0096] In one or more embodiments, the first arm may have a receiving portion for receiving at least a portion of the first fastener.

[0097] In the above structure, the dead space of the first arm can be effectively utilized.

[0098] In one or more embodiments, the base is rectangular in shape when viewed from above.

[0099] The above structure helps to prevent the portable band saw base from becoming too large. For example, users can store the portable band saw base in a narrow space.

[0100] In one or more embodiments, the base may be made of deep-drawn steel plate. The mounting arm may be made of die-cast alloy.

[0101] The above structure achieves both lightweight and high strength for the base of the portable band saw.

[0102] In one or more embodiments, the portable band saw base for mounting a portable band saw may have a base, a baffle, and a vise, wherein the baffle is disposed on the base and has an abutment surface for supporting the workpiece being cut; the vise is disposed on the base for fixing the workpiece being cut. The abutment surface may face the opposite side of the user. The vise is positioned on the user-opposite side of the abutment surface. The vise may have a clamping bar, an abutment member, and an operating member, wherein the abutment member is connected to one end of the clamping bar and contacts the workpiece being cut; the operating member is connected to the other end of the clamping bar. The abutment member may be positioned closer to the abutment surface than the operating member.

[0103] In the above structure, when the workpiece is cut by the blade of the portable band saw, if the workpiece moves towards the user due to the force of the blade transmitted towards the user, it is properly supported by the abutment surface of the baffle facing the opposite side of the user. The workpiece positioned against the baffle is properly secured by a vise disposed on the user-opposite side of the baffle's abutment surface. Since the abutment part of the vise is disposed on the user side of the operating component, the workpiece is properly secured by being pushed against the abutment surface of the baffle. The user can operate the operating component with good operability.

[0104] In one or more embodiments, the angle between the contact surface and the clamping rod may be more than 1 degree and less than 45 degrees.

[0105] In the above structure, the user can operate the operating components smoothly, and the workpiece is properly secured by the vise. When the angle between the abutment surface and the clamping bar is less than 1 degree, the force exerted by the abutment component to push the workpiece against the abutment surface of the baffle is likely to decrease. When the force exerted by the workpiece against the abutment surface of the baffle is decreased, the workpiece is likely not properly secured. When the angle between the abutment surface and the clamping bar is greater than 45 degrees, the distance between the user and the operating components on the user side of the portable band saw base is likely to increase. When the distance between the user and the operating components increases, it may be difficult for the user to operate the operating components smoothly. By making the angle between the abutment surface and the clamping bar between 1 degree and 45 degrees, the user can operate the operating components smoothly, and the workpiece is properly secured.

[0106] In one or more embodiments, the angle between the contact surface and the clamping rod may be 5 degrees or more and 20 degrees or less.

[0107] In the above structure, the user can operate the operating components smoothly, and the workpiece is properly secured by the vise. When the angle between the abutment surface and the clamping bar is less than 5 degrees, the force exerted by the abutment component to push the workpiece against the abutment surface of the baffle is likely to decrease. When the force exerted by the workpiece against the abutment surface of the baffle is decreased, the workpiece is more likely to be improperly secured. When the angle between the abutment surface and the clamping bar is greater than 20 degrees, the distance between the user and the operating components on the user side of the portable band saw base is likely to increase. When the distance between the user and the operating components increases, it may be difficult for the user to operate the operating components smoothly. By making the angle between the abutment surface and the clamping bar between 5 degrees and 20 degrees, the user can operate the operating components smoothly, and the workpiece is properly secured.

[0108] In one or more embodiments, the vise can be mounted on a support table, which is fixed to the upper surface of the base and has an upper surface for supporting the workpiece being cut.

[0109] In the above structure, the workpiece can be properly fixed by the abutting surface of the baffle, the abutting part of the vise, and the support platform.

[0110] In one or more embodiments, the vise may have a vise arm and a guide rod, wherein the vise arm supports the clamping rod; and the guide rod supports the vise arm. Alternatively, the guide rod and the clamping rod may be inclined in the same direction.

[0111] In the above structure, excessive torque acting from the vise arm onto the guide rod can be suppressed. Because the torque acting on the guide rod is small, changes in the force pushing the workpiece against the contact surface of the baffle can be suppressed. Therefore, the workpiece is properly fixed.

[0112] In one or more embodiments, the support platform may have a rod support portion for mounting a guide rod.

[0113] In the above structure, it is possible to prevent the number of components between the upper surface of the support table and the abutment member from becoming too large. By reducing the number of components, the workpiece can be properly secured by the abutment surface of the baffle, the abutment member of the vise, and the support table.

[0114] In one or more embodiments, the angle between the contact surface and the guide rod may be 5 degrees or more and 20 degrees or less.

[0115] In the above structure, the user can operate the operating components with good operability, and the workpiece can be properly fixed by the bench vise.

[0116] In one or more embodiments, the abutment component may be an elastomer made of rubber or synthetic resin.

[0117] In the above structure, the abutting component can deform in accordance with the shape of the workpiece being cut.

[0118] In one or more embodiments, the opposing portion of the abutting member facing the workpiece may include a recess that is recessed in a manner that moves away from the workpiece.

[0119] In the above structure, the abutting component can deform in accordance with the shape of the workpiece being cut.

[0120] In one or more embodiments, the inner surface of the recess may be curved.

[0121] In the above structure, the abutting component can deform in accordance with the shape of the workpiece being cut.

[0122] In one or more embodiments, the rubber hardness of the abutment component may be 80 or higher and 90 or lower.

[0123] In the above structure, the abutting component can be appropriately deformed in accordance with the shape of the workpiece being cut.

[0124] The following is a reference to the appendix. Figure 1The embodiments of the present invention will be described below. In these embodiments, the terms "front," "rear," "left," "right," "up," and "down" are used to describe the positional relationships of the various parts. These terms indicate the relative position or direction with reference to the center of the base 30 (portable band saw base). Furthermore, in these embodiments, a virtual axis parallel to the front-back direction is appropriately referred to as the front-back axis, a virtual axis parallel to the left-right direction is appropriately referred to as the left-right axis, and a virtual axis parallel to the up-down direction is appropriately referred to as the up-down axis.

[0125] As will be described later, when using the band saw 1 (portable band saw) mounted on the base 30, the user performs the operation from the front side of the base 30. In this embodiment, the front side is the user side where the user is located. The rear side is the opposite side of the front side, the user side.

[0126] Implementation Method 1 The first embodiment is described.

[0127] [band saw] Figure 1 This is a perspective view of the band saw 1 as described in the embodiment, shown from the upper left front side. Figure 2 This is a diagram showing the band saw 1 as described in the implementation method, viewed from the right side. Figure 3 This is an exploded view of the band saw 1 involved in the implementation method, viewed from the right side. Figure 1 , Figure 2 and Figure 3 The arrows indicating "forward", "backward", "left", "right", "up" and "down" indicate the directions assuming that the band saw 1 is mounted on the mounting arm 34 and is positioned at the lower stop of the mounting arm 34, as described later.

[0128] Band saw 1 is a type of power tool that uses an electric motor as its power source. Band saw 1 refers to a power tool that cuts a workpiece W by rotating a band-shaped blade 2. In this embodiment, band saw 1 is a portable band saw. The user of band saw 1 can carry band saw 1 by hand. The user of band saw 1 can cut the workpiece W while holding band saw 1.

[0129] The band saw 1 has a housing 3, a handle 4, and a plate 5.

[0130] The housing 3 is longer in the front-to-back direction. The housing 3 includes a base housing 6 and a cover housing 7. The base housing 6 is disposed on the upper side of the cover housing 7. The base housing 6 and the cover housing 7 are arranged in an overlapping manner. The base housing 6 is made of metal. Aluminum or magnesium can be examples of metals forming the base housing 6. The cover housing 7 is made of synthetic resin. Polycarbonate resin or polyamide resin can be examples of synthetic resins forming the cover housing 7.

[0131] With the band saw 1 mounted on the mounting arm 34 (described later) and the mounting arm 34 positioned at its lower dead center, the upper surface of the base housing 6 is inclined upwards to the right. The upper right portion of the base housing 6 and the upper right portion of the cover housing 7 are connected via a hinge 8. The axis of rotation of the hinge 8 extends in the front-rear direction. A receiving space is formed between the base housing 6 and the cover housing 7.

[0132] An opening 9 is provided in the center of the housing 3 in the front-rear direction. The opening 9 is formed in a recessed manner from the lower left end of the housing 3 to the upper right.

[0133] The handle 4 is held by the user of the band saw 1. The handle 4 is fixed to the housing 3. The handle 4 is fixed to the upper part of the base housing 6 by a plurality of screws 10. The handle 4 includes a first part 4A, a second part 4B, and a third part 4C, wherein the first part 4A is fixed to a portion of the base housing 6 further rearward than the opening 9; the second part 4B is fixed to a portion of the base housing 6 further forward than the opening 9; and the third part 4C connects the first part 4A and the second part 4B. The first part 4A and the second part 4B are respectively arranged to extend upward from the base housing 6. The third part 4C is arranged to connect the upper end of the first part 4A to the upper end of the second part 4B.

[0134] Plate 5 is fixed to housing 3. Plate 5 is fixed to the upper part of base housing 6 by a plurality of screws 11. Plate 5 is positioned on the rear side of handle 4. Plate 5 is longer in the front-to-back direction. The front end of plate 5 is fixed to base housing 6 by two screws 11. The rear end of plate 5 is positioned on the rear side of the rear end portion of housing 3. Plate 5 is made of metal. Iron can be used as an example of the metal forming plate 5.

[0135] The band saw 1 has a motor 13, a battery mounting part 14, a drive wheel 15, a driven wheel 16, a blade 2, a tension adjustment handle 17, a rear guide roller 18, a front guide roller 19, a stop plate 20, a main switch 21, a speed change dial 22, and a light 42.

[0136] Motor 13 is the power source for band saw 1. Motor 13 is an electric motor. Motor 13 is housed in motor housing 23. Motor housing 23 is fixed to a portion of base housing 6 located forward of opening 9. Motor housing 23 is positioned to protrude upward and to the left from the upper surface of base housing 6. Motor 13 is an internal rotor type brushless motor.

[0137] The battery mounting section 14 is connected to the battery pack 24. The battery pack 24 is mounted on the battery mounting section 14. The battery mounting section 14 is located at the front end (user-side end) of the handle 4. The battery mounting section 14 is located at the front of the second part 4B of the handle 4. The battery pack 24 is the power source for the band saw 1. The battery pack 24 contains a rechargeable battery. The battery pack 24 supplies direct current to the band saw 1. The motor 13 is driven by the power supplied from the battery pack 24.

[0138] When the battery pack 24 is installed in the battery mounting portion 14, it is secured to the battery mounting portion 14 by a locking mechanism (not shown). The battery pack 24 is movable vertically relative to the battery mounting portion 14. The battery mounting portion 14 has a guide mechanism that guides the battery pack 24 vertically. The battery pack 24 has a lock release button 24A for releasing the fixation by the locking mechanism. By operating the lock release button 24A, the fixation of the battery pack 24 by the locking mechanism is released. When the battery pack 24 is installed in the battery mounting portion 14, the lock release button 24A is located on the upper part of the battery pack 24. When the battery pack 24 is installed in the battery mounting portion 14, after operating the lock release button 24A, the battery pack 24 is removed from the battery mounting portion 14 by moving the battery pack 24 upwards. The battery pack 24 is installed in the battery mounting portion 14 by sliding the battery pack 24 downwards relative to the battery mounting portion 14.

[0139] The drive wheel 15 and driven wheel 16 are respectively housed in the housing 3. The drive wheel 15 is rotated by the motor 13. The drive wheel 15 is located at the front of the opening 9. The driven wheel 16 is located at the rear of the opening 9. The driven wheel 16 is located at the rear of the drive wheel 15 (opposite to the user).

[0140] like Figure 1 As shown, the housing 3 includes a front receiving portion 3A, a rear receiving portion 3B, and a bridge portion 3C. The front receiving portion 3A is disposed in front of the rear receiving portion 3B. In the front-rear direction, the bridge portion 3C is disposed between the front receiving portion 3A and the rear receiving portion 3B. The front receiving portion 3A is formed by the front part of the base housing 6 and the front part of the cover housing 7. The rear receiving portion 3B is formed by the rear part of the base housing 6 and the rear part of the cover housing 7. The bridge portion 3C is formed by the central part of the base housing 6 and the central part of the cover housing 7. A drive wheel 15 is received in the front receiving portion 3A. A driven wheel 16 is received in the rear receiving portion 3B. The bridge portion 3C is arranged to connect the upper part of the front receiving portion 3A to the upper part of the rear receiving portion 3B. An opening 9 is provided between the rear part of the front receiving portion 3A, the front part of the rear receiving portion 3B, and the lower part of the bridge portion 3C. The opening 9 is located on the underside of the bridge portion 3C.

[0141] A portion of the drive wheel 15 protrudes from the opening 7A in the cover housing 7. A portion of the driven wheel 16 protrudes from the opening 7B in the cover housing 7. The drive wheel 15 and the driven wheel 16 are rotatably supported on the base housing 6. The drive wheel 15 rotates about a first rotation axis CX1. The driven wheel 16 rotates about a second rotation axis CX2. The first rotation axis CX1 and the second rotation axis CX2 are parallel. The first rotation axis CX1 and the second rotation axis CX2 are inclined to the left and upward, respectively.

[0142] The blade 2 is mounted on the drive wheel 15 and the driven wheel 16. The blade 2 is annular. The blade 2 is stretched in the front-to-back direction by the drive wheel 15 and the driven wheel 16. At least a portion of the blade 2 is disposed in the opening 9. The workpiece W is cut by the blade 2 disposed in the opening 9. The blade 2 twists near the boundary of the opening 9. In the opening 9, the left and right surfaces of the blade 2 are orthogonal to the left and right axes, respectively.

[0143] The drive wheel 15 is connected to the rotor shaft of the motor 13. The drive wheel 15 rotates by the rotational force generated by the motor 13. When the drive wheel 15 rotates about the first rotation axis CX1 via the motor 13, the blade 2 rotates, supported by both the drive wheel 15 and the driven wheel 16. The driven wheel 16, with the blade 2 attached, rotates about the second rotation axis CX2 along with the rotation of the drive wheel 15.

[0144] The tension adjustment handle 17 is operated to adjust the tension of the blade 2. The tension adjustment handle 17 is connected to the driven wheel 16. By operating the tension adjustment handle 17, the driven wheel 16 moves in the back-and-forth direction. By moving the driven wheel 16 in the back-and-forth direction, the tension of the blade 2 is adjusted.

[0145] The rear guide roller 18 is used to guide the blade 2. The rear guide roller 18 is rotatably supported on the base housing 6 facing the opening 9. The rear guide roller 18 is disposed on the rear side of the opening 9. A pair of rear guide rollers 18 are provided to clamp the blade 2 from the left and right directions. The rotation axis of the rear guide roller 18 is parallel to the upper and lower axes.

[0146] The front guide roller 19 is used to guide the blade 2. The front guide roller 19 is rotatably supported on the base housing 6 facing the opening 9. The front guide roller 19 is disposed on the front side of the opening 9. A pair of front guide rollers 19 are provided to clamp the blade 2 from the left and right directions. The rotation axis of the front guide roller 19 is parallel to the upper and lower axes.

[0147] The blade 2 moves from the rear guide roller 18 to the front guide roller 19 within the opening 9. The blade 2 moves forward (to the user's side) within the opening 9. The drive wheel 15 rotates in such a way that the blade 2 moves forward within the opening 9.

[0148] In normal use, the stop plate 20 supports the workpiece W being cut. Normal use refers to the band saw 1 being used with the base 30 detached. Normal use also refers to the user holding the band saw 1 while cutting the workpiece W. In normal use, the user is positioned in front of the band saw 1, holding the handle 4 with their right hand to perform the operation. In normal use, the stop plate 20 supports the workpiece W from the front.

[0149] A stop plate 20 is supported on the base housing 6. The stop plate 20 is positioned at the front of the opening 9, facing it. The blade 2 rotates within the opening 9, moving from the rear guide roller 18 to the front guide roller 19. In normal use, the stop plate 20 supports the workpiece W from the front. The stop plate 20 prevents the workpiece W from moving due to the rotation of the blade 2. Figure 4 As shown, the stop plate 20 has a slit 20A that is longer in the vertical direction. The blade 2 passes through the slit 20A.

[0150] The stop plate 20 is fixed to the base housing 6 by a fixed operating handle 25. The fixed operating handle 25 is connected to the left side of the base housing 6 via a rotating member 25A. The fixed operating handle 25 and the rotating member 25A are fixed by screws 25B. The rotating member 25A is inserted into a slit 20B provided in the stop plate 20. The slit 20B is longer in the vertical direction. By rotating the fixed operating handle 25 in one direction, the stop plate 20 is clamped between the fixed operating handle 25 and the base housing 6, and the stop plate 20 is fixed to the base housing 6. By rotating the fixed operating handle 25 in the other direction, the fixation of the stop plate 20 is released.

[0151] The stop plate 20 can be adjusted in its vertical position relative to the base housing 6. For example... Figure 4 As shown, the stop pin 25C is fixed to the base housing 6. The stop pin 25C is a stop screw. At least a portion of the stop pin 25C is disposed in the slit 20B. The stop plate 20 can move vertically while being guided by the rotating member 25A and the stop pin 25C in the slit 20B. With the stop plate 20 released from its fixed position, after the stop plate 20 has moved vertically, it can be fixed in any position in the vertical direction by rotating the fixing operating handle 25 in one direction.

[0152] The main switch 21 is operated to drive or stop the motor 13. The main switch 21 is disposed on the handle 4. In this embodiment, the main switch 21 is arranged to protrude downward from the lower part of the rear of the third part 4C. The motor 13 is driven by pulling the main switch 21 in an upward movement.

[0153] A locking disconnect operation component 26 and a locking connect operation component 27 are disposed near the main switch 21. The locking disconnect operation component 26 is operated to change the operation of the main switch 21 from a blocked state to an enabled state. The locking disconnect operation component 26 is disposed on the upper part of part 1 4A. When the locking disconnect operation component 26 is not operated, the operation of the main switch 21 is blocked. By pressing the locking disconnect operation component 26, the operation of the main switch 21 is changed from a blocked state to an enabled state. The user can activate the main switch 21 by pressing the locking disconnect operation component 26.

[0154] The locking operation component 27 is activated to maintain the tripped state of the main switch 21. The locking operation component 27 is located at the rear of the third part 4C. After the main switch 21 is tripped, pressing the locking operation component 27 maintains the tripped state of the main switch 21. Even after the main switch 21 is released from its tripped state, pressing the locking operation component 27 after tripping the main switch 21 allows the motor 13 to continue driving.

[0155] Operate the gear shift dial 22 to adjust the rotational speed of the motor 13. The gear shift dial 22 is located on the upper part of the handle 4.

[0156] Lamp 42 is used to illuminate the workpiece W and the cutting blade 2. Lamp 42 is located on the left side of the base housing 6, positioned behind the center of the front-to-back direction. Lamp 42 is made of LED.

[0157] Figure 4 This is a perspective view of the band saw 1 according to the embodiment, shown from the upper left rear side. (See figure) Figure 4 As shown, a hook 28 can be mounted on the plate 5. The hook 28 is supported by a hook support member 29. The hook support member 29 supports the hook 28 in a rotatable manner. The hook support member 29 is fixed to the plate 5 by screws 11. The screws 11 fasten the hook support member 29 and the plate 5 together with the base housing 6. The plate 5 and the hook support member 29 are fastened together.

[0158] [Base] Figure 5 This is a perspective view of the base 30 on which the band saw 1 is mounted, as described in the embodiment, from the upper right front side. Figure 6 This is a perspective view of the base 30 on which the band saw 1 is mounted, shown from the upper left rear side of the embodiment. Figure 7 This is a perspective view of the base 30 on which the band saw 1 is mounted, shown from the lower left rear side of the embodiment. Figure 8 This is a view from the left side of the embodiment showing the base 30 on which the band saw 1 is mounted. Figure 9 This is a view from the right side of the embodiment showing the base 30 on which the band saw 1 is mounted. Figure 10This is a view from the front of the embodiment showing the base 30 on which the band saw 1 is mounted. Figure 11 This is a view from the rear of the embodiment showing the base 30 on which the band saw 1 is mounted. Figure 12 This is a view from above of the base 30 on which the band saw 1 is mounted, as per the embodiment described above. Figure 13 This is a view from the left side of the embodiment showing the base 30 on which the band saw 1 is mounted. Figure 14 This is a view from the right side of the embodiment showing the base 30 on which the band saw 1 is mounted. Figure 15 This is a view from the front of the embodiment showing the base 30 on which the band saw 1 is mounted. Figure 16 This is a diagram showing the base 30 on which the band saw 1 is mounted, as viewed from the rear side, according to the embodiment. Figure 17 This is a view from above of the base 30 on which the band saw 1 is mounted, as per the embodiment described above. Figure 18 This is a cross-sectional view showing a portion of the base 30 involved in the embodiment, equivalent to Figure 8 AA section view. Figure 19 This is a cross-sectional view showing a portion of the base 30 involved in the embodiment, equivalent to Figure 8 AA-AA section view. Figure 20 This is a cross-sectional view showing a portion of the base 30 involved in the embodiment, equivalent to Figure 13 AAA-AAA section view. Figure 21 This is a perspective view of the base 30 involved in the embodiment, shown from the upper right front side. Figure 22 This is a perspective view of the base 30 involved in the embodiment, shown from the upper left rear side. Figure 23 This is an exploded perspective view of the base 30 involved in the embodiment, shown from the upper left rear side.

[0159] Figure 5 , Figure 6 , Figure 7 , Figure 8 , Figure 9 , Figure 10 , Figure 11 and Figure 12 These represent the states where the mounting arm 34, on which the band saw 1 is mounted, is positioned at the top dead center. Figure 13 , Figure 14 , Figure 15 , Figure 16 and Figure 17 These represent the states where the mounting arm 34, on which the band saw 1 is mounted, is positioned at the lower dead center. Figure 21 , Figure 22 and Figure 23 These represent the states where the mounting arm 34 is positioned at the top dead center.

[0160] The base 30 is a portable band saw base for mounting the portable band saw 1. The base 30 supports the band saw 1. The band saw 1 can be attached to and detached from the base 30. The band saw 1, by being mounted on the base 30, is used as a type of stationary cutting machine, namely a stationary band saw. The band saw 1 is supported on the base 30 in a manner that allows it to swing vertically. With the band saw 1 mounted on the base 30, a pivot point AX is defined at the rear of the band saw 1. The front of the band saw 1 swings vertically.

[0161] When the base is installed, the user of the band saw 1 is positioned in front of the base 30 to perform the operation. "Base installed" means that the band saw 1 is used while mounted on the base 30. When the base is installed, the user is positioned in front of the base 30 on which the band saw 1 is mounted, and uses their right hand to hold the handle 4 to perform the operation.

[0162] In this embodiment, following the convention of the base 30, the side closer to the front is designated as the front side, and the side further inward is designated as the rear side, from the user's perspective. That is, the front side of the base 30 is the user's side, and the rear side of the base 30 is the opposite side of the user. From the user's perspective, the user's left-hand side is the left side, and the user's right-hand side is the right side.

[0163] The base 30 has a base 31, a vise 32, a baffle 33, a mounting arm 34, a first fastener 35, a second fastener 36, a support member 37, a locking member 38, and a reset device 40.

[0164] The base 31 supports the vise 32, the baffle 33, the mounting arm 34, and the reset device 40. The base 31 supports the workpiece W to be cut. The workpiece W is placed on the upper surface of the base 31. Viewed from above, the base 31 has a rectangular shape. The base 31 is essentially cuboid in shape. The vertical dimension of the base 31 is smaller than its horizontal and vertical dimensions.

[0165] The base 31 is made of metal. The base 31 can be made of steel or aluminum. The base 31 can be formed by deep drawing or by casting. In this embodiment, the base 31 is made of a deep-drawn steel sheet. The base 31 has an upper plate portion 31A and a side plate portion 31B protruding downwards from the periphery of the upper plate portion 31A. The upper plate portion 31A is rectangular in shape. The side plate portion 31B is a rectangular ring. Figure 7 As shown, a recess 31C is provided on the inner side of the side plate portion 31B. The prepared blade 2 is housed in the recess 31C. The recess 31C functions as a receiving portion (receiving space) for accommodating the prepared blade 2.

[0166] The base 31 has a plurality of hooks 31D protruding from the side plate portion 31B toward the center of the recess 31C. Each hook 31D is formed by bending a cut portion of the side plate portion 31B toward the center (inner side) of the recess 31C. One hook 31D is provided on each of the four sides of the side plate portion 31B. The prepared blade 2 is hung on the hook 31D while being housed in the recess 31C.

[0167] A vise 32 is disposed on the upper surface of the base 31. The vise 32 is used to fix the workpiece W to be cut. The vise 32 clamps the workpiece W from the vertical direction. Figure 21 and Figure 22 As shown, the vise 32 has a support table 32A, a vise plate 32B, a screw 32C, a knob 32D, a screw support component 32E, a guide rod 32F, a rod support component 32G, a first wing screw 32H, and a second wing screw 32J.

[0168] The support platform 32A is fixed to the upper surface of the base 31. The support platform 32A is substantially cuboid in shape. The support platform 32A supports the workpiece W to be cut from below. The workpiece W to be cut is placed on the upper surface of the support platform 32A. The support platform 32A includes an aluminum block portion 32A1 fixed to the upper surface of the base 31 and a steel plate portion 32A2 fixed to the upper surface of the block portion 32A1. The workpiece W to be cut is in contact with the upper surface of the plate portion 32A2. Since the block portion 32A1 is made of aluminum, the support platform 32A can be made lightweight. Since the plate portion 32A2 in contact with the workpiece W is made of steel, wear on the support platform 32A can be suppressed.

[0169] In the left-right direction, a groove 32K is provided on the right side of the center of the support platform 32A. The groove 32K is longer in the front-back direction. When the band saw 1 is positioned at the bottom dead center, the blade 2 is inserted into the groove 32K.

[0170] A vise plate 32B faces a support platform 32A. The vise plate 32B is positioned above the support platform 32A. The vise plate 32B is movable vertically. A screw 32C is fixed to the upper part of the vise plate 32B. The central axis of the screw 32C is parallel to the vertical axis. A knob 32D is fixed to the upper end of the screw 32C. A screw support member 32E rotatably supports the screw 32C. Rotation of the screw 32C moves the vise plate 32B vertically. A guide rod 32F guides the screw support member 32E vertically. The central axis of the guide rod 32F is parallel to the vertical axis. The screw support member 32E is movable vertically relative to the guide rod 32F. A rod support member 32G rotatably supports the lower end of the guide rod 32F. In this embodiment, the rod support member 32G is integral with the block portion 32A1 of the support platform 32A. The rod support member 32G and the block portion 32A1 are a single component. The guide rod 32F is rotatably supported on the rod support member 32G about its central axis. The first wing screw 32H, by rotating in one direction, fixes the screw support member 32E to the guide rod 32F. The first wing screw 32H, by rotating in the other direction, releases the fixation between the screw support member 32E and the guide rod 32F. The second wing screw 32J, by rotating in one direction, fixes the guide rod 32F to the rod support member 32G. The second wing screw 32J, by rotating in the other direction, releases the fixation between the guide rod 32F and the rod support member 32G.

[0171] When the workpiece W is fixed in the vise 32, after the workpiece W is placed on the upper surface of the support table 32A, the screw 32C is rotated by moving the vise plate 32B downwards. The user can move the vise plate 32B downwards by rotating the knob 32D with their fingers. With the workpiece W positioned between the support table 32A and the vise plate 32B, the workpiece W is clamped by the support table 32A and the vise plate 32B by moving the vise plate 32B downwards. Thus, the workpiece W is fixed in the vise 32.

[0172] By releasing the screw support member 32E secured by the first wing screw 32H, the user can move the screw support member 32E vertically, thereby adjusting the vertical position of the vise plate 32B relative to the support table 32A. Furthermore, by releasing the screw support member 32E secured by the first wing screw 32H, the user can rotate the screw support member 32E horizontally, thereby adjusting the horizontal (left-right) position of the vise plate 32B relative to the support table 32A. By releasing the guide rod 32F secured by the second wing screw 32J, the user can rotate the guide rod 32F, thereby adjusting the horizontal (left-right) position of the vise plate 32B relative to the support table 32A.

[0173] A baffle 33 is provided on the upper surface of the base 31. The baffle 33 supports the workpiece W placed on the support table 32A from the side. In this embodiment, the baffle 33 supports the workpiece W placed on the support table 32A from the front (user side). The baffle 33 is plate-shaped. The baffle 33 is formed by bending a metal plate. The baffle 33 has a fixing part 33A fixed to the base 31 and an opposing part 33B facing the workpiece W. The fixing part 33A is fixed to the upper plate part 31A by screws 33C. The opposing part 33B has an abutment surface 33D facing the workpiece W. The workpiece W is fixed to the vise 32 in a state of contact with at least a portion of the abutment surface 33D. The abutment surface 33D is orthogonal to the front and rear axes. The abutment surface 33D faces the rear side (opposite to the user). The vise 32 is positioned on the rear side of the contact surface 33D (opposite to the user).

[0174] In the left-right direction, a groove 33E is provided on the right side of the center of the baffle 33. The groove 33E is longer in the vertical direction. When the band saw 1 is positioned at the lower dead center, the blade 2 is inserted into the groove 33E. The blade 2 can move vertically along the inside of the groove 33E.

[0175] Mounting arm 34 is used to support band saw 1. Band saw 1 is mounted on mounting arm 34. Mounting arm 34 is pivotally supported on base 31. Mounting arm 34 can pivot about pivot point AX. The axis of pivot point AX extends in the left-right direction. The axis of pivot point AX is parallel to the left-right axis. Pivot point AX is located behind drive wheel 15 (opposite to the user).

[0176] like Figure 23 As shown, in this embodiment, the base 31 includes a bracket 31E. The bracket 31E is fixed to the upper plate portion 31A. The mounting arm 34 is pivotally supported on the bracket 31E of the base 31 with a pivot point AX as its center. The bracket 31E is disposed on the right rear portion of the upper surface of the upper plate portion 31A. The bracket 31E has a pair of support portions 31F spaced apart from each other in the left-right direction. The pivot support shaft 39 of the mounting arm 34 is supported on the support portions 31F of the bracket 31E. Figure 18 and Figure 23 As shown, the swing support shaft 39 includes a bolt 39A and a nut 39B that engages with the bolt 39A. The central axis of the swing support shaft 39 is aligned with the axis of the swing fulcrum AX. The mounting arm 34 is swingably supported on the swing support shaft 39.

[0177] Mounting arm 34 has a cylindrical portion 34C, a first arm portion 34A, and a second arm portion 34B. The cylindrical portion 34C is positioned around the pivot point AX. The cylindrical portion 34C is also positioned around the pivot support shaft 39. The cylindrical portion 34C rotates around the pivot point AX. The first arm portion 34A extends forward (to the user's side) from the cylindrical portion 34C. The second arm portion 34B extends upward from the cylindrical portion 34C. The first arm portion 34A and the second arm portion 34B each rotate around the pivot point AX. The first arm portion 34A and the second arm portion 34B are each fixed to the band saw 1.

[0178] Mounting arm 34 is made of die-cast alloy. In one embodiment, mounting arm 34 is formed by die-casting an aluminum alloy. Alternatively, mounting arm 34 can be formed by die-casting a magnesium alloy.

[0179] The first fastener 35 secures the first arm 34A to the band saw 1. The second fastener 36 secures the second arm 34B to the band saw 1. The first arm 34A is secured to at least a portion of the band saw 1 by the first fastener 35. The second arm 34B is secured to at least a portion of the band saw 1 by the second fastener 36.

[0180] Fastener 35 (first fastener) and 36 (second fastener) are both wing screws. Wing screws are screws that can be tightened by the user's fingers. Figure 8 and Figure 22 As shown, the first arm portion 34A has an opening 34D for inserting a threaded portion of the first fastener 35. The second arm portion 34B has a threaded hole 34E for inserting a threaded portion of the second fastener 36. Figure 1 As shown, a threaded hole 6A for inserting the threaded portion of the first fastener 35 is provided at the lower left rear part of the base housing 6 of the band saw 1. An opening 5A for inserting the threaded portion of the second fastener 36 is provided at the rear part of the plate 5 of the band saw 1.

[0181] By rotating the first fastener 35 with its threaded portion inserted into the threaded hole 6A via the opening 34D, the threaded portion of the first fastener 35 engages with the threaded hole 6A, and the first arm 34A is fixed to the base housing 6. By rotating the second fastener 36 with its threaded portion inserted into the threaded hole 34E via the opening 5A, the threaded portion of the second fastener 36 engages with the threaded hole 34E, and the second arm 34B is fixed to the plate 5. The user can fix the first arm 34A to the band saw 1 by pinching and rotating the first fastener 35 with their fingers without using tools. The user can fix the second arm 34B to the band saw 1 by pinching and rotating the second fastener 36 with their fingers without using tools.

[0182] Mounting arm 34 rotates within a specified range of motion around the pivot point AX. Mounting arm 34 rotates between the top dead center and the bottom dead center. The top dead center is the highest position within the range of motion. The bottom dead center is the lowest position within the range of motion.

[0183] When the mounting arm 34 rotates around the pivot point AX, the top end of the first arm 34A moves substantially in the vertical direction. When the mounting arm 34 is positioned at the uppermost point, the top end of the first arm 34A is positioned at the uppermost position within its movable range. When the mounting arm 34 is positioned at the lowermost point, the top end of the first arm 34A is positioned at the lowermost position within its movable range.

[0184] When the mounting arm 34 rotates around the pivot point AX, the tip of the second arm 34B moves substantially in the front-rear direction. When the mounting arm 34 is positioned at the top dead center, the tip of the second arm 34B is positioned at the rearmost position within its movable range. When the mounting arm 34 is positioned at the bottom dead center, the tip of the second arm 34B is positioned at the frontmost position within its movable range.

[0185] With the mounting arm 34 rotating around the pivot point AX, the band saw 1 mounted on the mounting arm 34 rotates in a manner that revolves around the pivot point AX. The band saw 1 is mounted on the mounting arm 34 such that the driven wheel 16 is positioned behind the drive wheel 15 (opposite to the user). The pivot point AX is positioned behind the drive wheel 15 (opposite to the user). In this embodiment, the pivot point AX is positioned behind the driven wheel 16 (opposite to the user). The front end of the band saw 1 (user-side end) moves substantially in the vertical direction. With the mounting arm 34 positioned at the top dead center, the front end of the band saw 1 is positioned at the uppermost position within its movable range. With the mounting arm 34 positioned at the bottom dead center, the front end of the band saw 1 is positioned at the lowermost position within its movable range. With the mounting arm 34 positioned at the top dead center, the band saw 1 is positioned at the top dead center. With the mounting arm 34 configured at its lower stop point, the band saw 1 is configured at its lower stop point.

[0186] like Figure 9 and Figure 21As shown, screw 50 is fixed to the cylindrical portion 34C of mounting arm 34. Screw 50 is inserted into a threaded hole in cylindrical portion 34C from the right side. The head of screw 50 protrudes to the right from the right surface of cylindrical portion 34C. The head of screw 50 is positioned on the rear side of bracket 31E. Screw 50 defines the range of rotation of mounting arm 34. Screw 50 defines the upper stop point of mounting arm 34. By moving mounting arm 34 upward from the lower stop point, the head of screw 50 contacts the rear surface of bracket 31E, thereby restricting the upward movement of mounting arm 34. The position of mounting arm 34 where the head of screw 50 contacts the rear surface of bracket 31E is the upper stop point of mounting arm 34.

[0187] like Figure 21 As shown, a protrusion 34F is provided on the lower surface of the first arm portion 34A. The protrusion 34F protrudes downward from the lower surface of the first arm portion 34A. The protrusion 34F is positioned above the upper plate portion 31A. The protrusion 34F defines the rotation range of the mounting arm 34. The protrusion 34F defines the lower stop point of the mounting arm 34. By moving the mounting arm 34 downward from the upper stop point, the protrusion 34F contacts the upper surface of the base 31, thereby restricting the downward movement of the mounting arm 34. The position of the mounting arm 34 where the protrusion 34F contacts the upper surface of the base 31 is the lower stop point of the mounting arm 34.

[0188] The reset device 40 automatically resets the mounting arm 34 to the top dead center. In this embodiment, the reset device 40 includes a spring 41 located between the base 31 and the mounting arm 34. The force of the spring 41 resets the mounting arm 34 to the top dead center. The force of the spring 41 also holds the mounting arm 34 at the top dead center. In this embodiment, the spring 41 is a torsion spring.

[0189] like Figure 21 and Figure 23 As shown, spring 41 has a helical portion 41A, an arm portion 41B, and an arm portion 41C. Arm portion 41B protrudes from one end of the helical portion 41A, and arm portion 41C protrudes from the other end of the helical portion 41A. The swing support shaft 39 of the mounting arm 34 is inserted into the inside of the helical portion 41A. One arm portion 41B of spring 41 contacts the bracket 31E of the base 31. One arm portion 41B of spring 41 pushes the bracket 31E of the base 31 from above. The other arm portion 41C of spring 41 contacts the cylindrical portion 34C of the mounting arm 34. The other arm portion 41C of spring 41 pushes the mounting arm 34 to its upper stop.

[0190] like Figure 18 As shown, spring 41 is disposed inside cylindrical portion 34C. Swing support shaft 39 is inserted inside helical portion 41A. Swing support shaft 39 includes bolt 39A and nut 39B. The head of bolt 39A is disposed on the right side of right support portion 31F. Nut 39B is disposed on the left side of left support portion 31F.

[0191] A sleeve 39C is disposed around the shaft portion of bolt 39A. The shaft portion of bolt 39A is disposed inside the sleeve 39C. The sleeve 39C is supported by a support portion 31F. The support portion 31F supports the shaft portion of bolt 39A via the sleeve 39C.

[0192] A first sleeve 39D and a second sleeve 39E are arranged around sleeve 39C. The first sleeve 39D is positioned to the right of the second sleeve 39E. The first sleeve 39D and the second sleeve 39E are positioned between the left and right support portions 31F. The shape and dimensions of the first sleeve 39D are substantially the same as those of the second sleeve 39E. A spiral portion 41A is arranged around the first sleeve 39D and the second sleeve 39E.

[0193] A sleeve 39F is disposed between the nut 39B and the support portion 31F on the left side. The sleeve 39F is disposed around the sleeve 39C. The right side of the sleeve 39C and the sleeve 39F are connected to the cylindrical portion 34C.

[0194] A washer 39G is disposed between the head of bolt 39A and the support portion 31F on the right side. A washer 39H is disposed between sleeve 39F and nut 39B. Nut 39B is a lock nut (nylon nut: JIS B1199-1) with an O-ring 39J made of polyamide as a resin component disposed in the annular groove at the opening of the threaded hole.

[0195] The support member 37 is fixed to the upper surface of the base 31. The support member 37 protrudes upward from the upper surface of the base 31. The support member 37 is disposed on the left side of the mounting arm 34. The support member 37 is disposed facing the left surface of the first arm portion 34A.

[0196] The locking member 38 is movably supported by the supporting member 37. The locking member 38 is a pin-shaped (rod-shaped) member that is longer in the left-right direction. Figure 20 As shown, the support member 37 has a support hole 37A for arranging at least a portion of the locking member 38. The locking member 38 is movably supported in the support hole 37A of the support member 37 in the left-right direction. The locking member 38 moves in the left-right direction on the left side of the first arm portion 34A. The locking member 38 secures the mounting arm 34 by inserting at least a portion of the first arm portion 34A.

[0197] like Figure 20As shown, an O-ring 38A is provided around the locking member 38. The O-ring 38A is disposed in a groove provided on the outer surface of the locking member 38. The O-ring 38A is disposed at the boundary between the outer surface of the locking member 38 and the inner surface of the support hole 37A. The O-ring 38A contacts the inner surface of the support hole 37A. By the contact between the O-ring 38A and the inner surface of the support hole 37A, accidental movement of the locking member 38 can be suppressed. In addition, when the locking member 38 moves, since the O-ring 38A moves while in contact with the inner surface of the support hole 37A, appropriate resistance can be obtained when the locking member 38 moves.

[0198] like Figure 20 , Figure 22 and Figure 23 As shown, the first arm portion 34A has a bottom dead center insertion hole 34G and a top dead center insertion hole 34H. The bottom dead center insertion hole 34G and the top dead center insertion hole 34H are respectively recessed from the left surface of the first arm portion 34A to the right. The bottom dead center insertion hole 34G is positioned above the top dead center insertion hole 34H.

[0199] The locking member 38 is inserted into at least one of the lower dead center insertion hole 34G and the upper dead center insertion hole 34H by moving to the right while supported on the support member 37. With the locking member 38 inserted into the lower dead center insertion hole 34G, the mounting arm 34 is fixed at the lower dead center. With the locking member 38 inserted into the upper dead center insertion hole 34H, the mounting arm 34 is fixed at the upper dead center.

[0200] The first arm portion 34A has a receiving portion 34J for receiving at least a portion of the first fastener 35. In an embodiment, the receiving portion 34J is a threaded hole for inserting the threaded portion of the first fastener 35. Figure 22 As shown, the storage portion 34J is provided on the rear side of the opening 34D. The storage portion 34J is also provided next to the opening 34D. The first fastener 35 is fixed to the first arm portion 34A by engaging with the threaded hole of the storage portion 34J through the threaded portion of the first fastener 35. Figure 22 As shown, when the band saw 1 is not mounted on the base 30, the threaded portion of the first fastener 35 engages with the threaded hole serving as the storage portion 34J, thus preventing the first fastener 35 from being lost. Similarly, when the band saw 1 is not mounted on the base 30, the threaded portion of the second fastener 36 engages with the threaded hole 34E of the second arm portion 34B, fixing the second fastener 36 to the second arm portion 34B, also preventing the second fastener 36 from being lost.

[0201] As described above, the stop plate 20 is fixed to the base housing 6 by the fixing operating handle 25. The position of the stop plate 20 relative to the base housing 6 in the vertical direction can be adjusted. The stop plate 20 can move in the vertical direction while the slit 20B is guided by the rotating member 25A and the stop pin 25C. With the stop plate 20 released, after the stop plate 20 moves in the vertical direction, it can be fixed in any position in the vertical direction by rotating the fixing operating handle 25 in one direction. When the band saw 1 is mounted on the base 30, the stop plate 20 is positioned at the top within its movable range. That is, when the band saw 1 is mounted on the base 30, the stop plate 20 is fixed to the housing 3 with the minimum amount of protrusion from the lower end of the housing 3 downward.

[0202] like Figure 1 , Figure 8 and Figure 19 As shown, the stop plate 20 is fixed to the base housing 6 via a fixed operating handle 25. The fixed operating handle 25 is connected to the left side of the base housing 6 via a rotating member 25A. The fixed operating handle 25 and the rotating member 25A are fixed together by screws 25B. The rotating member 25A has a fixed portion 25A1 and a threaded portion 25A2. The fixed portion 25A1 is fixed to the fixed operating handle 25 by screws 25B; the threaded portion 25A2 is located on the right side of the fixed portion 25A1. The threaded portion 25A2 is inserted into a threaded hole 6B provided in the base housing 6. The diameter of the fixed portion 25A1 is larger than the diameter of the threaded portion 25A2. The fixed portion 25A1 is located on the left side of the threaded portion 25A2. A washer 25D is disposed between the right surface of the fixed portion 25A1 and the stop plate 20. At least a portion of the rotating member 25A is inserted from the left side of the stop plate 20 into a slit 20B provided in the stop plate 20. With at least a portion of the rotating component 25A inserted into the slit 20B, the threaded portion 25A2 is inserted into the threaded hole 6B.

[0203] A stop pin 25C is positioned below the rotating component 25A. The stop pin 25C is screwed into the base housing 6 and secured thereto. At least a portion of the stop pin 25C protrudes to the left from the left surface of the base housing 6. At least a portion of the stop pin 25C is positioned within the slit 20B.

[0204] The slit 20B is longer in the vertical direction. Rotating the fixed operating handle 25 in one direction causes the rotating component 25A to rotate in the same direction, moving it to the right. This movement of the rotating component 25A to the right clamps the stop plate 20 between the washer 25D and the base housing 6, fixing the stop plate 20 to the base housing 6. Rotating the fixed operating handle 25 in the other direction causes the rotating component 25A to rotate in the opposite direction, moving it to the left. This movement of the rotating component 25A to the left releases the stop plate 20 from being fixed.

[0205] The stop plate 20 can be adjusted in its vertical position relative to the base housing 6. The stop plate 20 can move vertically while being guided by the rotating component 25A and the stop pin 25C in the slit 20B. With the stop plate 20 released from its fixed position, after the stop plate 20 has moved vertically, it can be fixed in any position in the vertical direction by rotating the fixed operating handle 25 in one direction.

[0206] The stop pin 25C defines the movable range of the stop plate 20. When the stop pin 25C is positioned at the top within the movable range of the stop plate 20, it contacts the lower end of the slit 20B.

[0207] like Figure 1 and Figure 17 As shown, in the left-right direction parallel to the axis of the swing fulcrum AX, the position of the cutting portion of the blade 2 relative to the handle 4 when the band saw 1 is mounted on the base is the same as the position of the cutting portion of the blade 2 relative to the handle 4 when the band saw 1 is in normal use. "Mounted on the base" means the band saw 1 is used with the blade mounted on the base 30. "Used normally" means the band saw 1 is used with the blade 2 removed from the base 30. The cutting portion of the blade 2 refers to a part of the blade 2 disposed in the opening 9. The workpiece W is cut using the blade 2 disposed in the opening 9. As described above, in normal use, the user also holds the handle 4 in a position located in front of the band saw 1 to perform the operation. In this embodiment, the cutting portion of the blade 2 is disposed on the left side of the handle 4, both when mounted on the base and in normal use.

[0208] like Figure 13 As shown, in the front-rear direction, the battery pack 24 installed in the battery mounting part 14 is positioned at a position Pa that is half the distance La from the pivot point AX to the front end (user side end) of the housing 3.

[0209] How to use a band saw Next, the method of using the band saw 1 will be explained. In normal use, the user holds the handle 4 with their right hand, positioned in front of the band saw 1. With the user holding the handle 4 with their right hand in this position, the cutting portion of the blade 2 is located on the left side of the handle 4. When the user holds the handle 4 with their right hand, the cutting portion of the blade 2 can be visually observed.

[0210] In normal use, when cutting the workpiece W, the user operates the main switch 21 with the fingers of their right hand holding the handle 4. The operation of the main switch 21 drives the motor 13, causing the blade 2 to rotate. With the blade 2 rotating, the workpiece W is cut by pushing the blade 2, which is positioned at the opening 9, against it. During cutting, the workpiece W is supported from the front by the stop plate 20.

[0211] When using the base, the stop plate 20 is not used. With the band saw 1 mounted on the base 30, after the user operates the fixed operating handle 25 by releasing the stop plate 20, the position of the stop plate 20 is adjusted so that the protrusion of the stop plate 20 from the lower end of the housing 3 is minimized. After adjusting the position of the stop plate 20 to minimize the protrusion of the stop plate 20 from the lower end of the housing 3, the user operates the fixed operating handle 25 to fix the stop plate 20.

[0212] When used on the base, the band saw 1 is mounted on the mounting arm 34. The user secures the base housing 6 of the band saw 1 to the first arm 34A using the first fastener 35, and secures the plate 5 of the band saw 1 to the second arm 34B using the second fastener 36. Additionally, after placing the workpiece W to be cut on the support table 32A in contact with the abutment surface 33D of the baffle 33, the user secures it using a vise 32. The workpiece W is supported from the front by the baffle 33.

[0213] With the band saw 1 mounted on the mounting arm 34 and the workpiece W to be cut secured by the vise 32, the user holds the handle 4 with their right hand while positioned in front of the band saw 1. When the user holds the handle 4 with their right hand while positioned in front of the band saw 1, the cutting portion of the blade 2 is positioned on the left side of the handle 4. With the user holding the handle 4 with their right hand, the cutting portion of the blade 2 can be visually observed.

[0214] When using the base, to cut the workpiece W, the user activates the main switch 21 with the fingers of their right hand holding the handle 4. Activating the main switch 21 drives the motor 13, causing the blade 2 to rotate. While the blade 2 is rotating, the user moves the handle 4 downwards by moving the mounting arm 34 to its lower stop point. Moving the handle 4 downwards brings the blade 2, positioned in the opening 9, closer to the workpiece W. The workpiece W is cut by pushing the blade 2 in the opening 9 against it. During cutting, the workpiece W is supported from the front by the baffle 33.

[0215] The battery pack 24 is positioned in front of position Pa (user side). Therefore, when the band saw 1 is moved to the lower stop point, the mass of the battery pack 24 makes it easy for the band saw 1 to move to the lower stop point.

[0216] After the band saw 1 moves to the lower stop point and the workpiece W is cut by the blade 2, the user releases the main switch 21 to stop the motor 13. After the motor 13 stops, the user removes their hand from the band saw 1 or reduces the force pushing the band saw 1 downwards, thereby the mounting arm 34 on which the band saw 1 is mounted automatically returns to the upper stop point via the reset device 40.

[0217] With the band saw 1 mounted on the mounting arm 34, for example when changing the blade 2, the user inserts the locking member 38 into the upper stop insertion hole 34H. By inserting the locking member 38 into the upper stop insertion hole 34H, the position of the band saw 1 is fixed at the upper stop. With the position of the band saw 1 fixed at the upper stop, the user can, for example, change the blade 2.

[0218] For example, when moving or storing the base 30, the user inserts the locking member 38 into the lower stop insertion hole 34G. By inserting the locking member 38 into the lower stop insertion hole 34G, the position of the base 30 is fixed at the lower stop. The user can move or store the base 30 while it is in a compacted state.

[0219] [Effect] As described above, in the embodiment, the base 30 for mounting the band saw 1 has a base 31, a mounting arm 34 and a reset device 40, wherein the mounting arm 34 is swayably supported on the base 31 with the pivot point AX as the center, and is used to mount the band saw 1; the reset device 40 causes the mounting arm 34 to automatically reset to the upper stop point.

[0220] In the above structure, when the band saw 1 is moved to its upper stop point, the user does not need to lift the band saw 1 manually. Therefore, the user's workload is reduced. Furthermore, since the user does not need to lift the band saw 1 manually, the user can quickly switch to other tasks. Therefore, it is possible to suppress the decrease in work efficiency and the extension of work time.

[0221] In one embodiment, the reset device 40 includes a spring 41 located between the base 31 and the mounting arm 34. The mounting arm 34 is held at its upper stop by the force of the spring 41.

[0222] In the above structure, the mounting arm 34 automatically returns to the upper stop point due to the force of the spring 41, and the position of the mounting arm 34 is reasonably maintained at the upper stop point. For example, the position of the band saw 1 is maintained at the upper stop point without using a locking mechanism.

[0223] In this embodiment, spring 41 is a torsion spring. The swing support shaft 39 of the mounting arm 34 is inserted into the helical portion 41A of the spring 41. One arm 41B of the spring 41 pushes against the base 31, and the other arm 41C of the spring 41 pushes the mounting arm 34 to its upper stop.

[0224] The above structure ensures good assemblability when manufacturing the base 30. Furthermore, it also ensures good workability when mounting the band saw 1 onto the base 30.

[0225] In one embodiment, the band saw 1 has a drive wheel 15, a driven wheel 16, and a blade 2, wherein the drive wheel 15 is rotated by a motor 13; the blade 2 is mounted on the drive wheel 15 and the driven wheel 16. The driven wheel 16 is located on the rear side of the drive wheel 15 (opposite to the user), and the pivot point AX is located on the rear side of the drive wheel 15 (opposite to the user).

[0226] In the above structure, the drive wheel 15 is positioned on the front side (user side) both when the base is installed and during normal use. The user can perform operations using the same method both when the base is installed and during normal use. "When the base is installed" means the band saw 1 is used with the base 30 mounted on it. "During normal use" means the band saw 1 is used with the base 30 removed from it.

[0227] In this embodiment, the band saw 1 has a housing 3 and a handle 4, wherein the housing 3 is used to house the drive wheel 15 and the driven wheel 16; the handle 4 is fixed to the housing 3. In the left-right direction parallel to the axis of the pivot point AX, the position of the blade 2 of the band saw 1 relative to the cutting portion of the handle 4 when mounted on the base is the same as the position of the blade 2 of the band saw 1 relative to the cutting portion of the handle 4 when in normal use.

[0228] In the above structure, the user can perform the operation through the same procedure when the base is installed and during normal use.

[0229] In the embodiment, the cutting portion of the blade 2 is located on the left side of the handle 4, both when the base is installed and during normal use.

[0230] In the above structure, when the user holds the handle 4 with their right hand, the user can easily visually observe the cutting part of the blade 2, thus suppressing the reduction in workability.

[0231] In one embodiment, the mounting arm 34 has a cylindrical portion 34C, a first arm portion 34A, and a second arm portion 34B, wherein the cylindrical portion 34C is disposed around the swing fulcrum AX; the first arm portion 34A extends from the cylindrical portion 34C toward the user side; and the second arm portion 34B extends from the cylindrical portion 34C upward. The base 30 has a first fastener 35 and a second fastener 36, wherein the first fastener 35 is used to fix the first arm portion 34A to the band saw 1; and the second fastener 36 is used to fix the second arm portion 34B to the band saw 1.

[0232] In the above structure, the band saw 1 is stably fixed to the base 30 by the mutually separated first fastener 35 and second fastener 36.

[0233] In the embodiment, at least one of the first fastener 35 and the second fastener 36 is a wing screw.

[0234] In the above structure, the user can assemble and disassemble the band saw 1 relative to the base 30 without using tools. A wing screw is a screw that can be tightened with fingers. In this embodiment, both the first fastener 35 and the second fastener 36 are wing screws.

[0235] In one embodiment, the base 30 has a vise 32 and a baffle 33. The vise 32 is disposed on the base 31 for fixing the workpiece W to be cut; the baffle 33 is disposed on the base 31 for supporting the workpiece W to be cut. The abutment surface 33D of the baffle 33 facing the workpiece W faces the rear side (opposite to the user), and the vise 32 is disposed on the rear side of the abutment surface 33D (opposite to the user).

[0236] In the above structure, when the workpiece W moves forward (to the user's side) due to the force transmitted from the blade 2 towards the user during cutting, the baffle 33 can properly support the workpiece W because the contact surface 33D of the baffle 33 faces the rear (opposite to the user). Since the vise 32 is positioned behind the contact surface 33D of the baffle 33 (opposite to the user), the vise 32 can properly fix the workpiece W positioned on the baffle 33.

[0237] In one embodiment, the base 30 for mounting the band saw 1 has a base 31 and a mounting arm 34, wherein the mounting arm 34 is pivotally supported on the base 31 about a pivot point AX, and is used to mount the band saw 1. The band saw 1 has a drive wheel 15, a driven wheel 16, a blade 2, a housing 3, and a battery mounting portion 14, wherein the drive wheel 15 is rotated by a motor 13; the blade 2 is hung on the drive wheel 15 and the driven wheel 16; the housing 3 is used to house the drive wheel 15 and the driven wheel 16; and the battery mounting portion 14 is used to mount a battery pack 24. The driven wheel 16 is located behind the drive wheel 15 (opposite to the user), and the pivot point AX is located behind the drive wheel 15 (opposite to the user). The battery pack 24 mounted in the battery mounting portion 14 is located forward (on the user side) at a position Pa that is half the distance La from the pivot point AX to the user-side end of the housing 3.

[0238] In the above structure, when the band saw 1 is moved to the lower stop point, the mass of the battery pack 24 makes it easy for the band saw 1 to move to the lower stop point. Therefore, the burden on the user can be reduced. In addition, the user can easily install and remove the battery pack 24 relative to the battery mounting part 14.

[0239] In one embodiment, the band saw 1 may have a handle 4, which is fixed to the housing 3. A battery mounting portion 14 is provided at the user-side end of the handle 4.

[0240] In the above structure, since the battery pack 24, which serves as a weight, is positioned at the user-side end of the handle 4, the user's sense of operation when moving the band saw 1 to the lower stop point is improved.

[0241] In one embodiment, the base 30 for mounting the band saw 1 has a base 31, a mounting arm 34, a first fastener 35, and a second fastener 36. The mounting arm 34 is pivotally supported on the base 31 about a pivot point AX and has a cylindrical portion 34C, a first arm portion 34A, and a second arm portion 34B. The cylindrical portion 34C is disposed around the pivot point AX. The first arm portion 34A extends from the cylindrical portion 34C toward the user side. The second arm portion 34B extends upward from the cylindrical portion 34C. The first fastener 35 is used to fix the first arm portion 34A to the band saw 1. The second fastener 36 is used to fix the second arm portion 34B to the band saw 1.

[0242] In the above structure, the band saw 1 is stably fixed to the base 30 by the mutually separated first fastener 35 and second fastener 36.

[0243] In one embodiment, the base 30 has a support member 37 and a locking member 38, wherein the support member 37 is fixed to the base 31; the locking member 38 is movably supported on the support member 37 and is used to fix the mounting arm 34 by being inserted into at least a portion of the first arm portion 34A.

[0244] In the above structure, the position of the mounting arm 34 can be fixed by the locking member 38. In addition, it can prevent the locking mechanism, which includes the support member 37 and the locking member 38, from becoming too large.

[0245] In this embodiment, the first arm portion 34A has a lower stop insertion hole 34G. By inserting the locking member 38 into the lower stop insertion hole 34G, the mounting arm 34 is fixed at the lower stop.

[0246] In the above structure, the position of the mounting arm 34 is fixed at the lower stop point by the locking member 38. In addition, it can prevent the locking mechanism, which includes the support member 37 and the locking member 38, from becoming too large.

[0247] In this embodiment, the first arm 34A has a lower dead center insertion hole 34G and a upper dead center insertion hole 34H. The mounting arm 34 is fixed to the lower dead center by inserting the locking member 38 into the lower dead center insertion hole 34G. The mounting arm 34 is fixed to the upper dead center by inserting the locking member 38 into the upper dead center insertion hole 34H.

[0248] In the above structure, the mounting arm 34 is fixed at the lower and upper stops respectively by the locking member 38. With the mounting arm 34 fixed at the upper stop, the user can, for example, change the blade 2 while the band saw 1 is mounted on the base 30. Fixing the mounting arm 34 at the upper stop prevents the band saw 1 from accidentally moving downwards during blade 2 replacement. Furthermore, it prevents the locking mechanism, including the support member 37 and the locking member 38, from becoming too large.

[0249] In one embodiment, the first arm portion 34A has a receiving portion 34J for receiving at least a portion of the first fastener 35.

[0250] In the above structure, the unused space of the first arm 34A can be effectively utilized.

[0251] In the implementation, the base 31 is rectangular in shape when viewed from above.

[0252] In the above structure, the base 30 can be prevented from becoming too large. For example, the user can store the base 30 in a narrow space.

[0253] In this embodiment, the base 31 is made of deep-drawn steel plate. The mounting arm 34 is made of die-cast alloy.

[0254] The above structure can balance the lightweight and high strength of the base 30.

[0255] Implementation Method 2 The second embodiment will be described. In the following description, the same reference numerals will be used to refer to structural elements that are the same as or equivalent to those in the embodiment described above, and the description of the structural elements will be simplified or omitted.

[0256] [band saw] Figure 24 This is a perspective view of the band saw 1 as described in the embodiment, shown from the upper left front side. Figure 25 This is a diagram showing the band saw 1 as described in the implementation method, viewed from the right side. Figure 26 This is an exploded view of the band saw 1 involved in the implementation method, viewed from the right side. Figure 27 This is a perspective view of the band saw 1 as described in the embodiment, shown from the upper left rear side. Figure 24 , Figure 25 , Figure 26 and Figure 27 The arrows indicating "forward", "backward", "left", "right", "up" and "down" indicate the directions assuming that the band saw 1 is mounted on the mounting arm 34 and is positioned at the lower stop of the mounting arm 34, as described later.

[0257] The stop plate 20 is fixed to the base housing 6 by two screws 25. The screws 25 are inserted into a slit 20B provided in the stop plate 20. The slit 20B is longer in the vertical direction. After being inserted into the slit 20B, the screws 25 are inserted into a threaded hole 6B provided in the base housing 6. By inserting the screws 25 into the threaded hole 6B provided in the base housing 6 via the slit 20B, the stop plate 20 is fixed to the base housing 6. The stop plate 20 can be adjusted in its vertical position relative to the base housing 6.

[0258] [Base] Figure 28 This is a perspective view of the base 30 on which the band saw 1 is mounted, as described in the embodiment, from the upper right front side. Figure 29 This is a perspective view of the base 30 on which the band saw 1 is mounted, shown from the upper left rear side of the embodiment. Figure 30 This is a perspective view of the base 30 on which the band saw 1 is mounted, shown from the lower left rear side of the embodiment. Figure 31 This is a view from the left side of the embodiment showing the base 30 on which the band saw 1 is mounted. Figure 32 This is a view from the right side of the embodiment showing the base 30 on which the band saw 1 is mounted. Figure 33 This is a view from the front of the embodiment showing the base 30 on which the band saw 1 is mounted. Figure 34 This is a diagram showing the base 30 on which the band saw 1 is mounted, as viewed from the rear side, according to the embodiment. Figure 35 This is a view from above of the base 30 on which the band saw 1 is mounted, as per the embodiment described above. Figure 36 This is a view from the left side of the embodiment showing the base 30 on which the band saw 1 is mounted. Figure 37 This is a view from the right side of the embodiment showing the base 30 on which the band saw 1 is mounted. Figure 38 This is a view from the front of the embodiment showing the base 30 on which the band saw 1 is mounted. Figure 39 This is a diagram showing the base 30 on which the band saw 1 is mounted, as viewed from the rear side, according to the embodiment. Figure 40 This is a view from above of the base 30 on which the band saw 1 is mounted, as per the embodiment described above. Figure 41 This is a cross-sectional view showing a portion of the base 30 involved in the embodiment, equivalent to Figure 31 AA section view. Figure 42 This is a cross-sectional view showing a portion of the base 30 involved in the embodiment, equivalent to Figure 31 AA-AA section view. Figure 43 This is a cross-sectional view showing a portion of the base 30 involved in the embodiment, equivalent to Figure 36 AAA-AAA section view. Figure 44 This is a perspective view of the base 30 involved in the embodiment, shown from the upper right front side. Figure 45 This is a perspective view of the base 30 involved in the embodiment, shown from the upper left rear side. Figure 46 This is an exploded perspective view of the base 30 involved in the embodiment, shown from the upper left rear side.

[0259] Figure 28 , Figure 29 , Figure 30 , Figure 31 , Figure 32 , Figure 33 , Figure 34 and Figure 35 These represent the states where the mounting arm 34, on which the band saw 1 is mounted, is positioned at the top dead center. Figure 36 , Figure 37 , Figure 38 , Figure 39 and Figure 40 These represent the states where the mounting arm 34, on which the band saw 1 is mounted, is positioned at the lower dead center. Figure 44 , Figure 45 and Figure 46 These represent the states where the mounting arm 34 is positioned at the top dead center.

[0260] Figure 47 This is a diagram showing a portion of the base 30 involved in the embodiment, viewed from the left. (See diagram.) Figure 44 , Figure 45 and Figure 47As shown, the vise 32 has an abutment part 32B, a clamping rod 32C, an operating part 32D, a vise arm 32E, a guide rod 32F, a first wing screw 32H, and a second wing screw 32J.

[0261] A vise 32 can be mounted on a support table 32A. The support table 32A is fixed to the upper surface of the base 31. The support table 32A is substantially cuboid in shape. The support table 32A has an upper surface for supporting the workpiece W to be cut. The support table 32A supports the workpiece W from below. The upper surface of the support table 32A is orthogonal to the upper and lower axes. The workpiece W to be cut is placed on the upper surface of the support table 32A. The support table 32A includes an aluminum block portion 32A1 fixed to the upper surface of the base 31 and a steel plate portion 32A2 fixed to the upper surface of the block portion 32A1. The upper surface of the support table 32A includes the upper surface of the plate portion 32A2. The workpiece W to be cut is in contact with the upper surface of the plate portion 32A2. Because the block portion 32A1 is made of aluminum, the support table 32A can be made lightweight. Since the plate portion 32A2 that contacts the workpiece W being cut is made of steel, wear on the support platform 32A can be suppressed.

[0262] In the left-right direction, a groove 32K is provided on the right side of the center of the support platform 32A. The groove 32K is longer in the front-back direction. When the band saw 1 is positioned at the bottom dead center, the blade 2 is inserted into the groove 32K.

[0263] The abutment member 32B is rotatably connected to the lower end of the clamping rod 32C about the central axis CX. The abutment member 32B is fixed to the lower end of the clamping rod 32C. The abutment member 32B faces the support table 32A. The abutment member 32B is positioned on the upper side of the support table 32A. The abutment member 32B contacts the workpiece W being cut.

[0264] The clamping rod 32C is fixed to the upper part of the abutment member 32B. The central axis CX of the clamping rod 32C is inclined relative to the upper and lower axes. In an embodiment, the clamping rod 32C has a threaded portion, which is a so-called vise screw with threaded teeth on the outer peripheral surface of the clamping rod 32C.

[0265] The operating component 32D is connected to the upper end of the clamping rod 32C. The operating component 32D is fixed to the upper end of the clamping rod 32C. The operating component 32D is operated by the user. The user can rotate the operating component 32D. By rotating the operating component 32D, the clamping rod 32C moves in a spiral motion around the central axis CX. When the abutment component 32B contacts the workpiece W, the clamping rod 32C moves in a spiral motion, so that the abutment component 32B does not rotate but moves in a straight line.

[0266] The vise arm 32E rotatably supports the clamping bar 32C. The vise arm 32E has a threaded hole for accommodating the clamping bar 32C. By rotating the operating member 32D with the clamping bar 32C rotated, the clamping bar 32C moves in a direction parallel to the central axis CX. By rotating the clamping bar 32C, the abutment member 32B moves together with the clamping bar 32C.

[0267] Guide rod 32F guides vise arm 32E. The central axis DX of guide rod 32F is inclined relative to the upper and lower axes. Guide rod 32F guides vise arm 32E in a direction parallel to the central axis DX. Vise arm 32E can move relative to guide rod 32F in a direction parallel to the central axis DX.

[0268] The guide rod 32F and the clamping rod 32C are inclined in the same direction. The central axis CX of the clamping rod 32C is parallel to the central axis DX of the guide rod 32F.

[0269] The support platform 32A has a rod support portion 32G for mounting the guide rod 32F. The rod support portion 32G protrudes upward from the upper surface of the support platform 32A. The rod support portion 32G has a recess for inserting the lower end of the guide rod 32F. The rod support portion 32G rotatably supports the lower end of the guide rod 32F. In this embodiment, the rod support portion 32G is integral with the block portion 32A1 of the support platform 32A. The rod support portion 32G and the block portion 32A1 are a single component. The guide rod 32F is rotatably supported on the rod support portion 32G about its central axis DX.

[0270] The first wing screw 32H secures the vise arm 32E to the guide rod 32F by rotating it in one direction. Rotating the first wing screw 32H in the other direction releases the vise arm 32E from the guide rod 32F.

[0271] The second wing screw 32J secures the guide rod 32F to the rod support 32G by rotating it in one direction. Rotating the second wing screw 32J in the other direction releases the connection between the guide rod 32F and the rod support 32G.

[0272] When the workpiece W is fixed in the vise 32, after the workpiece W is placed on the upper surface of the support table 32A, the clamping rod 32C is rotated so that the abutment member 32B approaches the workpiece W. The user can move the abutment member 32B by rotating the operating member 32D by pinching it. With the workpiece W positioned between the support table 32A and the abutment member 32B, the workpiece W is clamped by the support table 32A and the abutment member 32B as it is moved closer to the workpiece W by the abutment member 32B. Thus, the workpiece W is fixed in the vise 32.

[0273] By releasing the vise arm 32E secured by the first wing screw 32H, the user can move the vise arm 32E, thereby adjusting the position of the abutting member 32B relative to the support table 32A. Furthermore, by releasing the vise arm 32E secured by the first wing screw 32H, the user can rotate the vise arm 32E around the central axis DX, thereby adjusting the horizontal (left-right) position of the abutting member 32B relative to the support table 32A. By releasing the guide rod 32F secured by the second wing screw 32J, the user can rotate the guide rod 32F around the central axis DX, thereby adjusting the horizontal (left-right) position of the abutting member 32B relative to the support table 32A.

[0274] A baffle 33 is provided on the upper surface of the base 31. The baffle 33 supports the workpiece W placed on the support table 32A from the side. In this embodiment, the baffle 33 supports the workpiece W placed on the support table 32A from the front (user side). The baffle 33 is plate-shaped. The baffle 33 is formed by bending a metal plate. The baffle 33 has a fixing part 33A fixed to the base 31 and an opposing part 33B facing the workpiece W. The fixing part 33A is fixed to the upper plate part 31A by screws 33C. The opposing part 33B has an abutment surface 33D facing the workpiece W. The abutment surface 33D supports the workpiece W from the side. The workpiece W is fixed to the vise 32 in a state of contact with at least a portion of the abutment surface 33D. The abutment surface 33D is orthogonal to the front and rear axes. The abutment surface 33D faces the rear side (opposite to the user). The vise 32 is positioned on the rear side of the contact surface 33D (opposite to the user). The contact surface 33D of the baffle 33 supports the workpiece W to be cut from the front side (user side).

[0275] Mounting arm 34 has a cylindrical portion 34C, a first arm portion 34A, and a second arm portion 34B. The cylindrical portion 34C is positioned around the pivot point AX. The cylindrical portion 34C rotates around the pivot point AX. The first arm portion 34A extends forward (to the user's side) from the cylindrical portion 34C. The second arm portion 34B extends upward from the cylindrical portion 34C. The first arm portion 34A and the second arm portion 34B each rotate around the pivot point AX. The first arm portion 34A and the second arm portion 34B are each fixed to the band saw 1.

[0276] A washer 39G is disposed between the head of bolt 39A and the support portion 31F on the right side. A washer 39H is disposed between sleeve 39F and nut 39B. Nut 39B is a lock nut (nylon nut: JIS B1199-1) with an O-ring 39J made of polyamide as a synthetic resin component disposed in the annular groove at the opening of the threaded hole.

[0277] like Figure 43 , Figure 45 and Figure 46 As shown, the first arm portion 34A has a bottom dead center insertion hole 34G and a top dead center insertion hole 34H. The bottom dead center insertion hole 34G and the top dead center insertion hole 34H are respectively recessed from the left surface of the first arm portion 34A to the right. The bottom dead center insertion hole 34G is positioned above the top dead center insertion hole 34H.

[0278] like Figure 42 As shown, the stop plate 20 is fixed to the base housing 6 by two screws 25. The screws 25 are inserted into the slit 20B provided in the stop plate 20. The slit 20B is longer in the vertical direction. After being inserted into the slit 20B, the screws 25 are inserted into the threaded hole 6B provided in the base housing 6. By inserting the screws 25 into the threaded hole 6B provided in the base housing 6 via the slit 20B, the stop plate 20 is fixed to the base housing 6.

[0279] The stop plate 20 can be adjusted in position relative to the base housing 6 in the vertical direction. The slit 20B is longer in the vertical direction. When the stop plate 20 is released from its fixation by the screw 25 and the tip of the screw 25 is inserted into the threaded hole 6B, it can move vertically while the slit 20B is guided by the screw 25. When the stop plate 20 is released from its fixation by the screw 25, after the stop plate 20 moves vertically, it can be fixed in any position in the vertical direction by rotating the screw 25 in one direction. When the band saw 1 is mounted on the base 30, the stop plate 20 is positioned at the top within its movable range. That is, when the band saw 1 is mounted on the base 30, the stop plate 20 is fixed to the housing 3 with the minimum amount of protrusion from the lower end of the housing 3 downward.

[0280] [Bench vise] Figure 48 This is a cross-sectional view showing a portion of the base 30 involved in the embodiment. (e.g.) Figure 47 and Figure 48 As shown, baffle 33 and vise 32 are respectively disposed on base 31. Baffle 33 has abutment surface 33D for supporting workpiece W to be cut. Abutment surface 33D faces rearward (opposite to the user). Abutment surface 33D is a flat surface. Abutment surface 33D is orthogonal to the front and rear axes. Abutment surface 33D is parallel to the upper and lower axes and the left and right axes, respectively.

[0281] The vise 32 is used to hold the workpiece W being cut. The vise 32 is positioned on the rear side of the abutment surface 33D (opposite to the user).

[0282] The vise 32 has a support platform 32A, a clamping bar 32C, an abutment member 32B, an operating member 32D, a vise arm 32E, a guide rod 32F, a first wing screw 32H, and a second wing screw 32J. The support platform 32A is fixed to the upper surface of the base 31. The abutment member 32B is connected to the lower end (one end) of the clamping bar 32C and contacts the workpiece W being cut. The operating member 32D is connected to the upper end (the other end) of the clamping bar 32C. The vise arm 32E is used to support the clamping bar 32C. The guide rod 32F is used to support the vise arm 32E.

[0283] The support platform 32A is positioned on the rear side of the contact surface 33D (opposite to the user). The support platform 32A has an upper surface for supporting the workpiece W. The support platform 32A supports the workpiece W from below. The upper surface of the support platform 32A is flat. The upper surface of the support platform 32A is orthogonal to the vertical axis. The upper surface of the support platform 32A is parallel to the front-rear axis and the left-right axis, respectively. The workpiece W is placed on the upper surface of the support platform 32A. The support platform 32A includes an aluminum block portion 32A1 fixed to the upper surface of the base 31 and a steel plate portion 32A2 fixed to the upper surface of the block portion 32A1. The upper surface of the support platform 32A includes the upper surface of the plate portion 32A2.

[0284] The abutment member 32B, clamping rod 32C, and operating member 32D are respectively disposed on the rear side of the abutment surface 33D (opposite to the user). In the front-rear direction, the abutment member 32B is disposed closer to the abutment surface 33D than the operating member 32D. The abutment member 32B is disposed in front of the operating member 32D (user side). In the left-right direction, the center position of the abutment member 32B is substantially equal to the center position of the operating member 32D.

[0285] The central axis CX of the clamping rod 32C is inclined relative to the upper and lower axes. On a specified surface including the upper and lower axes and the front and rear axes, the central axis CX of the clamping rod 32C is inclined relative to the abutment surface 33D. The central axis CX of the clamping rod 32C is parallel to the specified surface. The central axis CX of the clamping rod 32C is inclined upwards away from the abutment surface 33D.

[0286] On the specified surface, the angle θa formed by the abutment surface 33D of the baffle 33 and the central axis CX of the clamping rod 32C is 1 degree or more and 45 degrees or less. Angle θa can be 5 degrees or more and 20 degrees or less. Angle θa can also be 10 degrees or more and 15 degrees or less. In this embodiment, angle θa is 10 degrees. Angle θa is the angle formed by the upper and lower axes and the central axis CX on the specified surface. The central axis CX is slightly inclined relative to the upper and lower axes.

[0287] The vise arm 32E rotatably supports the clamping rod 32C. In this embodiment, the clamping rod 32C is a lead screw. The vise arm 32E has a threaded hole for accommodating the clamping rod 32C. By operating the operating member 32D by rotating the clamping rod 32C, the clamping rod 32C moves in a direction parallel to the central axis CX. By rotating the clamping rod 32C, the abutment member 32B moves together with the clamping rod 32C.

[0288] The guide rod 32F guides the vise arm 32E in a direction parallel to the central axis DX. The central axis DX of the guide rod 32F is inclined relative to the contact surface 33D. On a defined surface including the upper and lower axes and the front and rear axes, the central axis DX of the guide rod 32F is inclined relative to the contact surface 33D. The central axis DX of the guide rod 32F is parallel to the defined surface. The central axis DX of the guide rod 32F is inclined upwards away from the contact surface 33D.

[0289] The guide rod 32F and the clamping rod 32C are inclined in the same direction. The central axis CX of the clamping rod 32C is parallel to the central axis DX of the guide rod 32F.

[0290] On the specified surface, the angle θb formed by the straight line parallel to the abutment surface 33D of the baffle 33 and passing through the rotation axis of the second butterfly screw 32J and the central axis DX of the guide rod 32F can be 1 degree or more and 45 degrees or less. Angle θb can also be 5 degrees or more and 20 degrees or less. Angle θb can also be 10 degrees or more and 15 degrees or less. In the embodiment, angle θb is the same as angle θa, which is 10 degrees. Angle θb is the angle formed by the upper and lower axes and the central axis DX on the specified surface. The central axis DX is slightly inclined relative to the upper and lower axes.

[0291] The support platform 32A has a rod support portion 32G for mounting the guide rod 32F. The rod support portion 32G protrudes upward from the upper surface of the support platform 32A. The rod support portion 32G has a recess for inserting the lower end of the guide rod 32F. The rod support portion 32G rotatably supports the lower end of the guide rod 32F.

[0292] The abutment member 32B is an elastomer made of rubber. The rubber hardness of the abutment member 32B is 80 or higher and 90 or lower. In this specification, the rubber hardness is the Type A hardness measured by a Type A durometer at a standard temperature of 23±2℃ according to JIS-K6253. Alternatively, the abutment member 32B may be an elastomer made of synthetic resin.

[0293] The abutment member 32B is essentially conical in shape. The central axis of the abutment member 32B coincides with the central axis CX of the clamping rod 32C. The diameter of the abutment member 32B gradually decreases towards its upper end.

[0294] like Figure 48 As shown, the opposing portion of the abutting member 32B facing the workpiece W includes a recess 32L that is recessed away from the workpiece W. The opposing portion of the abutting member 32B includes a conical lower surface of the abutting member 32B. The inner surface 32M of the recess 32L is curved. In an embodiment, the inner surface 32M of the recess 32L is spherical. Alternatively, the inner surface 32M of the recess 32L may be a curved surface other than a sphere, such as a second-order curved surface. It may also be a shape formed by combining two curved surfaces, such as a sphere and a cylinder, or a sphere and a cone.

[0295] When the workpiece W is fixed in the vise 32, after the workpiece W is placed on the upper surface of the support table 32A, the clamping rod 32C is rotated so that the abutment member 32B approaches the workpiece W. The user operates the operating member 32D by rotating the clamping rod 32C. By rotating the clamping rod 32C, the abutment member 32B moves closer to the workpiece W. Since the angle θa is less than 45 degrees, it is possible to prevent the distance between the user, located on the front side (user side) of the base 30, and the operating member 32D from increasing. The user, located on the front side (user side) of the base 30, can smoothly operate the operating member 32D.

[0296] With the workpiece W positioned between the support table 32A and the abutment member 32B, the workpiece W is moved closer to the support table 32A and the abutment member 32B by the abutment member 32B, and is thus clamped by the support table 32A and the abutment member 32B. Therefore, the workpiece W is fixed to the vise 32. In this embodiment, since the central axis CX of the clamping rod 32C is inclined relative to the abutment surface 33D, therefore... Figure 47 As indicated by arrow Ya, a force is applied from the abutting member 32B towards the workpiece W in an inclined direction. By rotating the clamping rod 32C, the abutting member 32B moves the workpiece W towards the upper surface of the support table 32A and the abutting surface 33D of the baffle 33, respectively. Through the abutting member 32B, the workpiece W is pushed towards the upper surface of the support table 32A and the abutting surface 33D of the baffle 33, respectively. Therefore, even if the workpiece W is a round tube, the vise 32 can stably fix the workpiece W.

[0297] In this embodiment, since the abutment member 32B is an elastic body, the contact area between the abutment member 32B and the workpiece W increases due to the elastic deformation of the abutment member 32B when it is pushed against the workpiece W. Furthermore, the abutment member 32B deforms appropriately through the recess 32L provided at the lower part of the abutment member 32B. Therefore, the vise 32 can stably fix the workpiece W.

[0298] Figure 49This is a cross-sectional view showing a portion of the base 30 involved in the embodiment. Figure 49 An example is shown where the workpiece W2 is a square tube (square material). Since the abutment member 32B is an elastic body and has a recess 32L, even if the workpiece W2 is a square tube, the elastic deformation of the abutment member 32B when it is pressed against the workpiece W2 increases the contact area between the abutment member 32B and the workpiece W2. Therefore, the vise 32 can stably fix the workpiece W2.

[0299] How to use a band saw Next, the method of using the band saw 1 will be explained. In normal use, the user holds the handle 4 with their right hand, positioned in front of the band saw 1. With the user holding the handle 4 with their right hand in this position, the cutting portion of the blade 2 is located on the left side of the handle 4. When the user holds the handle 4 with their right hand, the cutting portion of the blade 2 can be visually observed.

[0300] In normal use, when cutting the workpiece W, the user operates the main switch 21 with the fingers of their right hand holding the handle 4. The operation of the main switch 21 drives the motor 13, causing the blade 2 to rotate. With the blade 2 rotating, the blade 2, positioned at the opening 9, is pressed against the workpiece W, thereby cutting the workpiece W. During cutting, the workpiece W is supported from the front by the stop plate 20.

[0301] When using the base, the stop plate 20 is not used. With the band saw 1 mounted on the base 30, the user, after rotating the screw 25 to release the stop plate 20, adjusts the position of the stop plate 20 so that its protrusion from the lower end of the housing 3 is minimized. After adjusting the position of the stop plate 20 to minimize its protrusion from the lower end of the housing 3, the user rotates the screw 25 to fix the stop plate 20.

[0302] When used on the base, the band saw 1 is mounted on the mounting arm 34. The user secures the base housing 6 of the band saw 1 to the first arm 34A using the first fastener 35, and secures the plate 5 of the band saw 1 to the second arm 34B using the second fastener 36. Additionally, after placing the workpiece W to be cut on the support table 32A in contact with the abutment surface 33D of the baffle 33, the user secures it using a vise 32. The workpiece W is supported from the front by the baffle 33.

[0303] After the mounting arm 34 is mounted on the band saw 1 and the workpiece W to be cut is fixed by the vise 32, the user holds the handle 4 with their right hand while positioned in front of the band saw 1. With the user holding the handle 4 with their right hand in this position, the cutting portion of the blade 2 is positioned on the left side of the handle 4. This allows the user to visually observe the cutting portion of the blade 2 while holding the handle 4 with their right hand.

[0304] When using the base, to cut the workpiece W, the user activates the main switch 21 with the fingers of their right hand holding the handle 4. Activating the main switch 21 drives the motor 13, causing the blade 2 to rotate. While the blade 2 is rotating, the user moves the handle 4 downwards by moving the mounting arm 34 to its lower stop point. As the handle 4 moves downwards, the blade 2, positioned at the opening 9, approaches the workpiece W. The blade 2, positioned at the opening 9, is pressed against the workpiece W, thereby cutting the workpiece W. During cutting, the workpiece W is supported from the front by the baffle 33.

[0305] In the front-rear direction, the battery pack 24 is positioned at the front (user side) of the center of the housing 3. Therefore, when the band saw 1 is moved to the lower stop point, the mass of the battery pack 24 makes it easy for the band saw 1 to move to the lower stop point.

[0306] After the band saw 1 moves to the lower stop point and the workpiece W is cut by the blade 2, the user releases the main switch 21 to stop the motor 13. After the motor 13 stops, the user removes their hand from the band saw 1 or reduces the force pushing the band saw 1 downwards, thereby the mounting arm 34 on which the band saw 1 is mounted automatically returns to the upper stop point via the reset device 40.

[0307] With the band saw 1 mounted on the mounting arm 34, for example when changing the blade 2, the user inserts the locking member 38 into the upper stop insertion hole 34H. By inserting the locking member 38 into the upper stop insertion hole 34H, the position of the band saw 1 is fixed at the upper stop. With the position of the band saw 1 fixed at the upper stop, the user can, for example, change the blade 2.

[0308] For example, when moving or storing the base 30, the user inserts the locking member 38 into the lower stop insertion hole 34G. By inserting the locking member 38 into the lower stop insertion hole 34G, the position of the base 30 is fixed at the lower stop. The user can move or store the base 30 while it is in a compacted state.

[0309] [Effect] As described above, in this embodiment, the base 30 for mounting the band saw 1 includes a base 31, a baffle 33, and a vise 32. The baffle 33 is disposed on the base 31 and has an abutment surface 33D for supporting the workpiece W. The vise 32 is disposed on the base 31 and is used to fix the workpiece W. The abutment surface 33D faces rearward (opposite to the user). The vise 32 is positioned behind the abutment surface 33D (opposite to the user). The vise 32 has a clamping bar 32C, an abutment member 32B, and an operating member 32D. The abutment member 32B is connected to one end of the clamping bar 32C and contacts the workpiece W; the operating member 32D is connected to the other end of the clamping bar 32C. The abutment member 32B is positioned closer to the abutment surface 33D than the operating member 32D.

[0310] In the above structure, when the workpiece W is cut by the blade 2 of the band saw 1, as the workpiece W moves forward (to the user's side) due to the force of the blade 2 transmitted towards the user, it is properly supported by the abutment surface 33D of the baffle 33 facing the rear (opposite to the user's side). The workpiece W, positioned on the baffle 33, is properly fixed by the vise 32 located on the rear side (opposite to the user's side) of the abutment surface 33D of the baffle 33. Since the abutment member 32B of the vise 32 is located on the front side (to the user's side) of the operating member 32D, the workpiece W is properly fixed by being pushed against the abutment surface 33D of the baffle 33. The user can operate the operating member 32D with good operability.

[0311] In the implementation, the angle θa formed by the contact surface 33D and the clamping rod 32C is more than 1 degree and less than 45 degrees.

[0312] In the above structure, the user can operate the operating component 32D with good operability, and the workpiece W is properly fixed by the vise 32. When the angle θa between the abutment surface 33D and the clamping rod 32C is less than 1 degree, the force exerted by the abutment component 32B on the workpiece W against the abutment surface 33D of the baffle 33 may be weakened. When the force exerted by the workpiece W on the abutment surface 33D of the baffle 33 is weakened, the possibility that the workpiece W is not properly fixed increases. When the angle θa between the abutment surface 33D and the clamping rod 32C is greater than 45 degrees, the distance between the user and the operating component 32D, located on the front side (user side) of the base 30, may increase. When the distance between the user and the operating component 32D increases, the user may find it difficult to operate the operating component 32D with good operability. By making the angle θa between the contact surface 33D and the clamping rod 32C greater than 1 degree and less than 45 degrees, the user can operate the operating component 32D with good operability, and the workpiece W to be cut is properly fixed.

[0313] In the implementation, the angle θa formed by the contact surface 33D and the clamping rod 32C is 5 degrees or more and 20 degrees or less.

[0314] In the above structure, the user can operate the operating component 32D with good operability, and the workpiece W is properly fixed by the vise 32. When the angle θa between the abutment surface 33D and the clamping rod 32C is less than 5 degrees, the force exerted by the abutment component 32B on the workpiece W against the abutment surface 33D of the baffle 33 may be weakened. When the force exerted by the workpiece W on the abutment surface 33D of the baffle 33 is weakened, the possibility that the workpiece W is not properly fixed increases. When the angle θa between the abutment surface 33D and the clamping rod 32C is greater than 20 degrees, the distance between the user and the operating component 32D, located on the front side (user side) of the base 30, may increase. When the distance between the user and the operating component 32D increases, the user may find it difficult to operate the operating component 32D with good operability. With the angle θa between the contact surface 33D and the clamping rod 32C being 5 degrees or more and 20 degrees or less, the user can operate the operating component 32D with good operability, and the workpiece W to be cut is properly fixed.

[0315] In one embodiment, the vise 32 can be mounted on a support platform 32A, which is fixed to the upper surface of the base 31 and has an upper surface for supporting the workpiece W to be cut.

[0316] In the above structure, the workpiece W to be cut can be properly fixed by the abutting surface 33D of the baffle 33, the abutting part 32B of the vise 32 and the support table 32A.

[0317] In one embodiment, the vise 32 has a vise arm 32E and a guide rod 32F, wherein the vise arm 32E supports the clamping rod 32C; and the guide rod 32F supports the vise arm 32E. The guide rod 32F and the clamping rod 32C are inclined in the same direction.

[0318] In the above structure, excessive torque acting from the vise arm 32E to the guide rod 32F can be suppressed. Because the torque acting on the guide rod 32F is small, the force variation of the workpiece W pressing against the contact surface 33D of the baffle 33 can be suppressed. Therefore, the workpiece W is properly fixed.

[0319] In one embodiment, the support platform 32A has a rod support portion 32G, which is used to mount the guide rod 32F.

[0320] In the above structure, it is possible to prevent the number of components between the upper surface of the support table 32A and the abutment member 32B from becoming too large. By reducing the number of components, the workpiece W can be properly fixed by the abutment surface 33D of the baffle 33, the abutment member 32B of the vise 32, and the support table 32A.

[0321] In the implementation, the angle θb between the contact surface 33D and the guide rod 32F is 5 degrees or more and 20 degrees or less.

[0322] In the above structure, the user can operate the operating component 32D with good operability, and the workpiece W to be cut can be properly fixed by the vise 32.

[0323] In this embodiment, the contacting part 32B is an elastomer made of rubber or synthetic resin.

[0324] In the above structure, the abutting member 32B can deform in accordance with the shape of the workpiece W being cut.

[0325] In one embodiment, the opposing portion of the contacting member 32B facing the workpiece W includes a recess 32L that is recessed away from the workpiece W.

[0326] In the above structure, the abutting member 32B can deform in accordance with the shape of the workpiece W being cut.

[0327] In the embodiment, the inner surface 32M of the recess 32L is spherical.

[0328] In the above structure, the abutting member 32B can deform in accordance with the shape of the workpiece W being cut.

[0329] In this embodiment, the rubber hardness of the contacting component 32B is 80 or higher and 90 or lower.

[0330] In the above structure, the abutting member 32B can be appropriately deformed to correspond to the shape of the workpiece W being cut.

[0331] [Other implementation methods] In the above embodiment, the spring 41 of the reset device 40 is a torsion spring. The spring 41 of the reset device 40 can be a helical spring or a leaf spring.

[0332] In the above embodiment, the reset device 40 includes a spring 41. The reset device 40 may include, for example, a cylinder or an electric motor.

[0333] In the above embodiment, both the first fastener 35 and the second fastener 36 are wing screws. Alternatively, one of the first fastener 35 and the second fastener 36 may be a wing screw, while the other of the first fastener 35 and the second fastener 36 may be a conventional screw made with a tool.

Claims

1. A base for a portable band saw, used for mounting a portable band saw, characterized in that, It has a base, a mounting arm, and a reset device, wherein, The mounting arm is pivotally supported on the base with a pivot point as the center, and is used to mount a portable band saw; The reset device automatically resets the mounting arm to its upper stop point.

2. The portable band saw base according to claim 1, characterized in that, The reset device includes a spring located between the base and the mounting arm. The mounting arm is held at the upper stop point by the force of the spring.

3. The portable band saw base according to claim 2, characterized in that, The spring includes a torsion spring. The swing support shaft of the mounting arm is inserted into the helical portion of the torsion spring. One arm of the torsion spring pushes against the base. The other arm of the torsion spring pushes the mounting arm to the upper stop point.

4. The portable band saw base according to claim 1, characterized in that, The portable band saw has a drive wheel, a driven wheel, and a blade, wherein the drive wheel is rotated by a motor; the blade is mounted on the drive wheel and the driven wheel. The driven wheel is positioned on the opposite side of the user relative to the drive wheel. The pivot point is positioned on the opposite side of the user relative to the drive wheel.

5. The portable band saw base according to claim 4, characterized in that, The portable band saw has a housing and a handle, wherein the housing houses the drive wheel and the driven wheel; the handle is fixed to the housing. In the left-right direction parallel to the axis of the swing fulcrum, the position of the blade relative to the cutting portion of the handle when the portable band saw is mounted on the base is the same as the position of the blade relative to the cutting portion of the handle when the portable band saw is in normal use.

6. The portable band saw base according to claim 5, characterized in that, When the base is installed and during normal use, the cutting portion of the blade is positioned on the left side of the handle.

7. The portable band saw base according to claim 4, characterized in that, The mounting arm has a cylindrical portion, a first arm portion, and a second arm portion, wherein the cylindrical portion is disposed around the swing fulcrum; the first arm portion extends from the cylindrical portion toward the user side; and the second arm portion extends from the cylindrical portion upwards. The portable band saw base has a first fastener and a second fastener, wherein, The first fastener is used to secure the first arm to the portable band saw; The second fastener is used to secure the second arm to the portable band saw.

8. The portable band saw base according to claim 7, characterized in that, At least one of the first fastener and the second fastener is a wing screw.

9. The portable band saw base according to claim 1, characterized in that, It has a bench vise and a baffle, among which, The vise is mounted on the base and is used to fix the workpiece to be cut; The baffle is disposed on the base for supporting the workpiece being cut. The contact surface of the baffle, which faces the workpiece being cut, is opposite to the user. The vise is positioned on the opposite side of the user relative to the abutment surface.

10. A base for a portable band saw, used for mounting a portable band saw, characterized in that, It has a base and a mounting arm. The mounting arm is swayably supported on the base with a pivot point as its center, and is used to mount a portable band saw. The portable band saw includes a drive wheel, a driven wheel, a blade, a housing, and a battery mounting section. The drive wheel is rotated by a motor; the blade is mounted on the drive wheel and the driven wheel; the housing houses the drive wheel and the driven wheel; and the battery mounting section houses a battery pack. The driven wheel is positioned on the opposite side of the user relative to the drive wheel. The pivot point is positioned on the opposite side of the user relative to the drive wheel. The battery pack installed in the battery mounting section is positioned on the user side at a distance that is half the distance from the pivot point to the user-side end of the housing.

11. The portable band saw base according to claim 10, characterized in that, The portable band saw has a handle that is fixed to the housing. The battery mounting portion is located at the user-side end of the handle.

12. A base for a portable band saw, used to mount a portable band saw, characterized in that, It has a base, a mounting arm, a first fastener, and a second fastener, wherein, The mounting arm is pivotally supported on the base with a pivot point as the center, and has a cylindrical portion, a first arm portion and a second arm portion, wherein the cylindrical portion is disposed around the pivot point; the first arm portion extends from the cylindrical portion toward the user side; and the second arm portion extends from the cylindrical portion upward. The first fastener is used to secure the first arm to the portable band saw; The second fastener is used to secure the second arm to the portable band saw.

13. The portable band saw base according to claim 12, characterized in that, It has a support component and a locking component, wherein, The support component is fixed to the base; The locking member is movably supported on the support member and secures the mounting arm by being inserted into at least a portion of the first arm.

14. The portable band saw base according to claim 13, characterized in that, The first arm has an insertion hole for the lower stop point. The mounting arm is fixed at the lower stop point by inserting the locking component into the insertion hole at the lower stop point.

15. The portable band saw base according to claim 13, characterized in that, The first arm has an insertion hole for the lower dead center and an insertion hole for the upper dead center. The mounting arm is fixed at the lower stop point by inserting the locking component into the insertion hole. The mounting arm is fixed at the upper stop point by inserting the locking component into the upper stop point insertion hole.

16. The portable band saw base according to claim 12, characterized in that, The first arm has a receiving portion for receiving at least a portion of the first fastener.

17. The portable band saw base according to claim 12, characterized in that, Viewed from above, the base has a rectangular shape.

18. The portable band saw base according to claim 12, characterized in that, The base is made of deep-drawn steel plate. The mounting arm is made of die-cast alloy.

19. A base for a portable band saw, used for mounting a portable band saw, characterized in that, It has a base, a baffle, and a vise, among which, The baffle is disposed on the base and has an abutment surface for supporting the workpiece being cut; The vise is mounted on the base and is used to fix the workpiece to be cut. The contact surface faces the opposite side of the user. The vise is positioned opposite the user's side relative to the abutment surface and includes a clamping bar, an abutment member, and an operating member. The abutment member is connected to one end of the clamping bar and contacts the workpiece being cut; the operating member is connected to the other end of the clamping bar. The abutting member is positioned closer to the abutting surface than the operating member.

20. The portable band saw base according to claim 19, characterized in that, The angle between the contact surface and the clamping rod is more than 1 degree and less than 45 degrees.

21. The portable band saw base according to claim 19 or 20, characterized in that, The angle between the contact surface and the clamping rod is greater than 5 degrees and less than 20 degrees.

22. The portable band saw base according to any one of claims 19 to 21, characterized in that, The vise can be mounted on a support table, which is fixed to the upper surface of the base and has an upper surface for supporting the workpiece being cut.

23. The portable band saw base according to claim 22, characterized in that, The vise has vise arms and guide rods, wherein the vise arms support the clamping rods; and the guide rods support the vise arms. The guide rod and the clamping rod are inclined in the same direction.

24. The portable band saw base according to claim 23, characterized in that, The support platform has a rod support portion for mounting the guide rod.

25. The portable band saw base according to claim 23 or 24, characterized in that, The angle between the contact surface and the guide rod is greater than 5 degrees and less than 20 degrees.

26. The portable band saw base according to any one of claims 19 to 25, characterized in that, The abutting component is an elastomer made of rubber or synthetic resin.

27. The portable band saw base according to claim 26, characterized in that, The opposing portion of the abutting member facing the workpiece to be cut includes a recess that is recessed in such a way as to move away from the workpiece to be cut.

28. The portable band saw base according to claim 27, characterized in that, The inner surface of the recess is curved.

29. The portable band saw base according to any one of claims 19 to 28, characterized in that, The rubber hardness of the abutment component is above 80 and below 90.

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