Patent Application
20210129242
This application claims the benefit of priority to Japanese Patent Application No. 2019-200909, filed on Nov. 5, 2019, the entire contents of which are hereby incorporated by reference.
The present disclosure relates to a portable band saw.
A band saw cutting machine described in, for example, Japanese Unexamined Patent Application Publication No. 2016-147339, and a hand-held band saw described in, for example, U.S. Pat. No. 7,287,454 are known in the field of portable band saws.
A portable band saw may have a substantially equally balanced weight in the lateral direction to improve operability.
One or more aspects of the present disclosure are directed to a portable band saw with a substantially equally balanced weight in the lateral direction.
An aspect of the present disclosure provides a portable band saw, including:
a battery mount to which a battery is attachable;
a motor driven with electric power from the battery;
a band saw blade being endless and rotatable with power generated by the motor;
a body supporting the motor and the band saw blade; and
a handle including
The portable band saw according to the above aspect of the present disclosure can have a substantially equally balanced weight in the lateral direction.
Although one or more embodiments of the present disclosure will now be described with reference to the drawings, the present disclosure is not limited to the embodiments. The components in the embodiments described below may be combined as appropriate. One or more components may be eliminated.
As shown in
The portable band saw 1 also includes a stopper plate assembly 14, a hook 16, and a tension adjuster 18. The stopper plate assembly 14 supports a workpiece. The hook 16 can be hooked on an object. The tension adjuster 18 adjusts the tension of the band saw blade 12.
In the embodiment, the positional relationships between the components will be described using the directional terms such as right and left (or lateral), front and rear (or forward and backward), and up and down (or vertical). The terms indicate relative positions or directions with respect to the center of the portable band saw 1.
The supports 60 extend in the vertical direction. The grip 62 extends in the front-rear direction. The longitudinal direction of the supports 60 is referred to as the vertical direction. The longitudinal direction of the grip 62 is referred to as the front-rear direction. The direction orthogonal to the vertical direction and the front-rear direction is referred to as the lateral direction.
In the embodiment, the supports 60 protrude upward from the body 10. The battery mount 24 is located rearward from the handle 22. The band saw blade 12 is located leftward from the handle 22.
The direction parallel to a rotation axis MX of the motor 20 is referred to as the M-S direction. The direction orthogonal to the M-S direction and the front-rear direction is referred to as the K-L direction. The vertical direction is oblique to the M-S and K-L directions. In the embodiment, the motor 20 protrudes from the body 10 in M-direction. The band saw blade 12 is located in L-direction from the handle 22.
As shown in
The cover 32 covers the frame 30. The cover 32 is located farther in S-direction than the frame 30. The cover 32 is attached to the frame 30 with a hinge. The cover 32 is operable to be open and closed with respect to the frame 30. The cover 32 is formed from a synthetic resin such as polycarbonate or nylon.
The body 10 has an internal space defined between the frame 30 and the cover 32. The band saw blade 12 is at least partially located in the internal space of the body 10. The frame 30 rotatably supports the band saw blade 12.
The frame 30 supports the motor 20. The motor 20 is located on the surface 30f of the frame 30. The handle 22 is connected to the surface 30f of the frame 30. The hook 16 and the tension adjuster 18 are located on the frame 30.
The body 10 has a recess 10n in the center of the body 10 in the front-rear direction. The recess 10n is formed at an end of the body 10 in L-direction along the K-L direction.
The band saw blade 12 is at least partially located in the recess 10n. In the recess 10n, the band saw blade 12 is located in an external space of the body 10.
A cutting target for the portable band saw 1 is at least partially placed in the recess 10n. The band saw blade 12 cuts the workpiece in the recess 10n. The band saw blade 12 located in the recess 10n cuts the workpiece. A part of the band saw blade 12 located in the recess 10n may be hereafter referred to as a cutting portion 12c.
The cutting portion 12c of the band saw blade 12 cuts the workpiece. The cutting portion 12c is located in the external space of the body 10.
As shown in
The vertical wall 30a includes a linear portion 30p, a first bend 30q, a second bend 30r, a third bend 30s, and a fourth bend 30t.
The linear portion 30p is located in a portion of the vertical wall 30a in K-direction. The linear portion 30p extends in the front-rear direction.
The first bend 30q is located rearward in the vertical wall 30a. The first bend 30q is connected to the rear end of the linear portion 30p. The first bend 30q is bent to protrude rearward.
The second bend 30r is located frontward in the vertical wall 30a. The second bend 30r is connected to the front end of the linear portion 30p. The second bend 30r is bent to protrude frontward.
The third bend 30s is located to connect the first bend 30q and the cutout 30n. The third bend 30s is connected to an end of the first bend 30q in L-direction. The third bend 30s is bent to protrude in L-direction.
The fourth bend 30t is located to connect the second bend 30r and the cutout 30n. The fourth bend 30t is connected to an end of the second bend 30r in L-direction. The fourth bend 30t is bent to protrude in L-direction.
As shown in
When the cover 32 is closed, the vertical wall 30a of the frame 30 is aligned with the vertical wall 32a of the cover 32. Also, the cutout 30n in the frame 30 is aligned with the cutout 32n in the cover 32. The cutout 30n in the frame 30 and the cutout 32n in the cover 32 define the recess 10n in the body 10.
The vertical wall 32a includes a linear portion 32p, a first bend 32q, a second bend 32r, a third bend 32s, and a fourth bend 32t.
When the cover 32 is closed, the linear portion 32p of the cover 32 is aligned with the linear portion 30p of the frame 30. Also, the first bend 32q of the cover 32 is aligned with the first bend 30q of the frame 30. Also, the second bend 32r of the cover 32 is aligned with the second bend 30r of the frame 30. Also, the third bend 32s of the cover 32 is aligned with the third bend 30s of the frame 30. Also, the fourth bend 32t of the cover 32 is aligned with the fourth bend 30t of the frame 30.
As shown in
As shown in
The band saw blade 12 is an endless saw blade. The band saw blade 12 is formed from a metal. The band saw blade 12 is placed on the first and second saw wheels 40 and 42 while being pulled by the tension adjuster 18 in the front-rear direction.
The first saw wheel 40 rotates about a rotation axis BX. The second saw wheel 42 rotates about a rotation axis CX. The rotation axes BX and CX are parallel to the rotation axis MX of the motor 20. The rotation axis BX of the first saw wheel 40 aligns with the rotation axis MX of the motor 20.
The motor 20 generates power for rotating the first saw wheel 40. When the motor 20 is driven, the first saw wheel 40 rotates. When the first saw wheel 40 rotates with the band saw blade 12 on the first and second saw wheels 40 and 42, the band saw blade 12 rotates. This rotates the second saw wheel 42. The second saw wheel 42 rotates to follow the first saw wheel 40. In this manner, when the motor 20 is driven and thus the first saw wheel 40 rotates, the band saw blade 12 rotates while being supported by the first and second saw wheels 40 and 42.
The frame 30 includes a guide 44 for guiding the band saw blade 12. The guide 44 includes a first guide 44a and a second guide 44b. The first guide 44a is located frontward from the cutout 30n. The second guide 44b is located rearward from the cutout 30n. The first and second guides 44a and 44b each include a pair of rollers with the band saw blade 12 between them. The guide 44 guides the band saw blade 12 to twist the band saw blade 12 in the recess 10n. The guide 44 in the embodiment guides the band saw blade 12 to have the surface of the cutting portion 12c of the band saw blade 12 parallel to the vertical direction.
The band saw blade 12 in the embodiment rotates to move the cutting portion 12c rearward in the recess 10n.
As shown in
As shown
The stopper plate assembly 14 includes a plate 14a and bolts 14b. The plate 14a has a long hole 14a1 to receive the bolts 14b. The positions of the long hole 14a1 and the bolts 14b are adjusted to position the plate 14a. The bolts 14b are fastened to the frame 30 of the body 10.
The hook 16 can be hooked on an object. The hook 16 is located at the front end of the surface 30f of the frame 30. The hook 16 is rotatably supported by the frame 30.
The motor 20 is an electric motor drivable with electric power from the battery 26. As shown in
The motor 20 includes a stator 52 and a rotor 54. The motor 20 is accommodated in a housing 50. The motor 20 is located rearward from the recess 10n and frontward from a rear end 10e of the body 10. The motor 20 protrudes from the frame 30 in M-direction.
The housing 50 includes a first portion 50a and a second portion 50b. The first portion 50a serves as a motor housing for accommodating the motor 20. The second portion 50b accommodates wires and other interconnections connected to the stator 52. As shown in
The stator 52 is cylindrical. The rotor 54 is located inside the stator 52. As shown in
The supports 60 include a support 60A and a support 60B. The support 60A is located frontward from the recess 10n. The support 60B is located rearward from the recess 10n.
The supports 60 extend in the vertical direction. The supports 60 include lower ends 60a and upper ends 60b. The lower ends 60a of the supports 60 are connected to the surface of the frame 30.
The grip 62 is grippable by an operator. The grip 62 extends in the front-rear direction. The grip 62 has a front end 62a and a rear end 62b. The grip 62 has the front end 62a connected to the upper end 60b of the support 60A, and the rear end 62b connected to the upper end 60b of the support 60B.
The grip 62 has an operation part 64 at the rear end 62b for adjusting the rotational speed of the band saw blade 12. The operator operates the operation part 64 to change the rotational speed of the band saw blade 12.
Positional Relationship between Handle, Motor, and Battery
The grip 62 is located rightward from the motor 20. The grip 62 is located upward and rightward from the cutting portion 12c of the band saw blade 12. The left end of the grip 62 aligns with the right end of the recess 10n in the lateral direction.
The grip 62 has a larger dimension than the recess 10n in the front-rear direction. The grip 62 has the front end 62a frontward from the front end of the recess 10n, and the rear end 62b rearward from the rear end of the recess 10n. The grip 62 of the handle 22 at least partially aligns with the cutting portion 12c of the band saw blade 12 in the front-rear direction.
The grip 62 has a central axis AX extending in the front-rear direction. The central axis AX passes through the center of the grip 62 in the lateral direction. The first portion 50a has an end face 50c in M-direction. A center point P refers to a crossing point between the rotation axis MX of the motor 20 and the end face 50c. The center point P may be the center of the motor 20 in the front-rear direction. A distance D1 refers to a distance in the lateral direction between the central axis AX of the grip 62 and the cutting portion 12c of the band saw blade 12. A distance D2 refers to a distance in the lateral direction between the central axis AX of the grip 62 and the center point P. In this case, the distance D2 is larger than the distance D1. More specifically, the motor 20 at least partially protrudes leftward from the cutting portion 12c.
A virtual plane Q refers to a plane including the center point P and extending in the vertical and lateral directions. The virtual plane Q may be the center of the motor 20 in the front-rear direction. A center R of the motor 20 in the lateral direction is defined on the virtual plane Q. In some embodiments, a center R of the motor 20 in the lateral direction may not be defined on the virtual plane Q.
The battery mount 24 includes a connector terminal connectable to a power terminal of the battery 26. The battery 26 is attached to the battery mount 24 to power the portable band saw 1.
As shown in
The battery mount 24 at least partially protrudes rightward from the rear end 62b of the grip 62. The battery mount 24 includes a portion 24s, a portion 24t, and a protrusion 24b. The portion 24s is located rearward from the grip 62. The portion 24t protrudes rightward from the portion 24s. The protrusion 24b protrudes rightward from the portion 24t. The grip 62 aligns with the portion 24s in the lateral direction. The portion 24t is located rightward from the grip 62 in the lateral direction. The battery mount 24 is at least partially located rightward from the grip 62.
The battery mount 24 has a central axis AX1 extending in the front-rear direction. The central axis AX1 passes through the center of the battery mount 24 in the lateral direction. In the lateral direction, the central axis AX1 of the battery mount 24 is located rightward from the central axis AX of the grip 62. More specifically, the center of the battery mount 24 is located rightward from the center of the handle 22 in the lateral direction.
A distance D3 refers to a distance in the lateral direction between the central axis AX and the central axis AX1. In this case, the distance D3 is smaller than the distances D1 and D2. A distance D4 refers to a distance in the lateral direction between the right end face of the protrusion 24b of the battery mount 24 and the central axis AX of the grip 62. In this case, the distance D4 is smaller than the distance D2. More specifically, the battery mount 24 protrudes less from the grip 62 than the motor 20 from the grip 62 in the lateral direction.
The battery mount 24 has an upper rear end face 24aa and a lower rear end face 24ab located frontward from the rear end 10e of the body 10 (frame 30). The upper rear end face 24aa is located rearward from the lower rear end face 24ab. The upper and lower rear end faces 24aa and 24ab are planes. The upper and lower rear end faces 24aa and 24ab are parallel to each other. The battery mount 24 is at least partially located rightward from the recess 10n in the body 10. The battery mount 24 is located frontward from the rear end 10e.
The upper rear end face 24aa of the battery mount 24 is located frontward from the center point P. As described above, the center point P is a crossing point between the rotation axis MX of the motor 20 and the end face 50c. The battery mount 24 is located frontward from the center (virtual plane Q) of the motor 20.
The center point P of the motor 20 is located leftward from the central axis AX of the grip 62 of the handle 22. The center R of the motor 20 is located leftward from the center of the grip 62 of the handle 22 in the lateral direction.
As shown in
The upper front end face 26aa has the same shape as the upper rear end face 24aa of the battery mount 24. The lower front end face 26ab has the same shape as the lower rear end face 24ab of the battery mount 24. When the battery 26 is attached to the battery mount 24, the rear end face 26b is located frontward from the rear end 10e of the body 10. More specifically, the battery 26 is located frontward from the rear end 10e of the body 10. The battery 26 is at least partially located rightward from the recess 10n in the body 10.
The battery 26 and the motor 20 are arranged in the lateral direction. The battery 26 at least partially aligns with the motor 20 in the front-rear direction. The battery 26 in the embodiment includes a portion 26s and a portion 26t. The portion 26t is located rearward from the portion 26s. The portion 26s aligns with the motor 20 in the front-rear direction. The portion 26t is located rearward from the motor 20.
The battery 26 has a central axis AX2 extending in the front-rear direction. The central axis AX2 passes through the center of the battery 26 in the lateral direction. The central axis AX2 of the battery 26 is located rightward from the central axis AX of the grip 62 in the lateral direction. More specifically, the center of the battery 26 is located rightward from the center of the handle 22 in the lateral direction.
The center of the battery mount 24 aligns with the center of the battery 26 in the lateral direction. The central axis AX1 of the battery mount 24 aligns with the central axis AX2 of the battery 26. The center of the battery 26 is located rightward from the center of the grip 62 of the handle 22 in the lateral direction.
As shown in
The operator uses the portable band saw 1 to perform an operation while gripping the handle 22. The portable band saw 1 may have a substantially equally balanced weight in the lateral direction to improve operability. In the embodiment, the motor 20 is located leftward from the handle 22, and the battery 26 is located rightward from the handle 22. This structure allows the portable band saw 1 to have a substantially equally balanced weight in the lateral direction with the handle 22 serving as a supporting point. The portable band saw 1 may have smaller overall dimensions to improve operability. In the embodiment, the handle 22 at least partially aligns with the cutting portion 12c of the band saw blade 12 in the front-rear direction. The battery 26 at least partially aligns with the motor 20 in the front-rear direction. This structure allows the portable band saw 1 to have a smaller dimension in the front-rear direction and have a substantially equally balanced weight in the lateral direction.
In the present embodiment described above, the center R of the motor 20 is located on one side (the left) of the center (central axis AX) of the handle 22, and the center (central axis AX2) of the battery 26 is located on the other side (the right) of the center of the handle 22. With respect to the central axis AX of the handle 22, the motor 20 has the center of gravity located leftward, and the battery 26 has the center of gravity located rightward. This structure allows the portable band saw 1 to have a substantially equally balanced weight in the lateral direction.
The handle 22 at least partially aligns with the cutting portion 12c of the band saw blade 12 in the front-rear direction. The battery 26 at least partially aligns with the motor 20 in the front-rear direction. This structure allows the portable band saw 1 to have a smaller dimension in the front-rear direction. This structure also allows the portable band saw 1 to have a substantially equally balanced weight in the lateral direction.
The battery mount 24 is located rearward from the handle 22. The battery mount 24 in the embodiment is located at the rear of the handle 22 and is integral with the handle 22. This allows the portable band saw 1 to have a simpler structure and smaller overall dimensions.
The battery mount 24 is located frontward from the center (virtual plane Q) of the motor 20. The battery 26 is thus located more frontward, allowing the portable band saw 1 to have smaller overall dimensions.
The battery 26 is located frontward from the rear end 10e of the body 10. The portable band saw 1 includes the battery 26 without protruding rearward from the rear end 10e of the body 10 and thus has smaller overall dimensions.
In the above embodiment, the battery 26 may be at least partially located rearward from the rear end 10e of the body 10.
The battery mount 24 may be located rearward from the center of the motor 20.
The battery mount 24 may be located frontward from the handle 22. The battery mount 24 may be located at least on either the left side or the right side of the handle 22.
The motor 20 may be located frontward from the battery mount 24.
The handle 22 may not align with the cutting portion 12c in the front-rear direction. The battery 26 may not align with the motor 20 in the front-rear direction.
| Number | Date | Country | Kind |
|---|---|---|---|
| 2019-200909 | Nov 2019 | JP | national |
