Handheld band saw

Abstract

The present invention relates to a hand-held band saw comprising a substantially planar frame, a main handle extending upwardly and outwardly from the frame, the main handle comprising a first grip extending along a second plane parallel to the cutting plane, and an auxiliary handle located substantially in front of the main handle, the auxiliary handle comprises a first end and a second holding part, wherein the first end is located right in front of the first holding part and intersects with the second plane, and the second holding part extends towards the cutting plane from the first end. According to the band saw, the design of the improved auxiliary handle is adopted, and the band saw can meet the operation requirements of different machining positions.

Description

TECHNICAL FIELD

[0001] The present application relates to a cutting tool, in particular to a hand-held band saw. BACKGROUND

[0002] The hand-held band saws on the market generally adopt the way of holding the main handle and the auxiliary handle at the same time to complete the machining operation. The main handle of the existing hand-held band saw is usually arranged at the upper and rear part of the saw wheel shell frame, for example, the main handle is arranged at the position behind the cutting-in position of the band saw blade, extends from the side of the saw wheel shell frame to the front and upward, and descends downward at the top end side (front end side). The auxiliary handle of the existing hand-held band saw has three common forms, for example, the spherical handle arranged in front of the main handle disclosed in CN102186615A, the C-shaped handle disclosed in CN115592201A, and the auxiliary handle arranged at the side of the battery pack mounting portion 27 disclosed in CN117620307A.

[0003] When using the hand-held band saw, the band saw is started by holding the main handle to control the trigger, and the auxiliary handle (such as the spherical handle) is held in a lifting manner to complete the cutting operation together with the main handle. The hand-held band saw needs to simultaneously meet the cutting requirements of the upward, downward and forward positions during the construction operation. However, the existing hand-held band saw can meet the basic requirement of downward cutting of the user, but cannot provide effective support when cutting upward and forward, which is relatively laborious. For example, when the auxiliary handle is the spherical handle or the C-shaped handle arranged in front of the main handle, the user holds the main handle with the right hand and holds the auxiliary handle with the left hand, so that the left and right hands of the user are deviated from the cutting plane of the band saw blade, which is not conducive to the accuracy of operation, especially when machining the workpiece forward or upward, the left hand holding the auxiliary handle may also interfere with the user's vision, affecting the convenience and accuracy of operation. The auxiliary handle arranged at the side of the battery pack mounting portion 27 causes the band saw blade cutting plane to be easily deflected when machining the workpiece downward, and the overall structure of the band saw is not compact enough. SUMMARY

[0004] The technical problem to be solved by the present application is to provide a hand-held band saw with an improved design of the auxiliary handle, which can be suitable for the operation requirements of different machining positions.

[0005] This invention provides a handheld band saw comprising a generally planar frame housing a drive wheel and a driven wheel, wherein the drive wheel and driven wheel mesh with a ring saw blade, the frame defining a first plane; the frame also has an opening for receiving a workpiece, within which the ring saw blade exposes an inclined portion; the inclined portion defines a cutting plane, the band saw further comprising a main handle extending upward and outward from the frame and an auxiliary handle located in front of the main handle, wherein the main handle includes a first grip extending along a second plane parallel to the cutting plane, and the auxiliary handle includes a first end located in front of the first grip and intersecting the second plane, and a second grip extending from the first end toward the cutting plane. This invention provides a novel auxiliary handle design that can simultaneously meet the user's operational needs for using the band saw in different processing positions. When the handheld band saw needs to cut the workpiece downwards, the user can hold the first grip with one hand and grasp the first end of the auxiliary handle with the other, allowing the exposed saw blade to cut the workpiece almost vertically downwards. When the handheld band saw needs to cut the workpiece forwards or upwards, the user can hold the first grip with one hand and grasp the second grip of the auxiliary handle with the other. The angled second grip provides more effective support when the band saw is cutting forwards or upwards. Users can quickly select different grip points according to actual needs without making any mechanical adjustments to the auxiliary handle itself to meet the operational requirements of different positions.

[0006] The auxiliary handle also includes a second grip portion connected to a second end of the frame. This provides better rigidity to the auxiliary handle.

[0007] The second end is connected to the frame near the opening. For ergonomic reasons, the second end is designed as close as possible to the cutting point to provide better support while meeting safety regulations.

[0008] The second grip portion extends in a curved shape from the first end to the second end. This design of the auxiliary handle is more ergonomic and easier for the user to hold.

[0009] Preferably, the second grip is generally arc-shaped, and the line connecting the two ends of the arc of the second grip forms an angle α with the second plane, wherein the angle is 15°≤α≤90°. Such a second grip is simple to manufacture, and the band saw has a compact body, which can meet the needs of operation in confined spaces.

[0010] The center of the first end is within the second plane. In this way, both the center of the first end and the first grip are within the second plane, allowing the user to press the band saw downwards more effectively when simultaneously holding the main handle and the auxiliary handle to process the workpiece, thereby improving cutting efficiency.

[0011] The first end of the auxiliary handle is connected to the main handle via a connecting part. Thus, the main handle and the auxiliary handle are integrated, and the handle assembly has a simple structure while possessing good strength and durability.

[0012] The handheld band saw of the present invention provides an improved auxiliary handle design, which allows users to quickly select different grip points according to actual needs, and does not require any mechanical adjustment to the auxiliary handle mechanism itself, thus meeting the operational needs of different positions. At the same time, the band saw has a compact structural design, making it suitable for a variety of applications. Attached Figure Description

[0013] A better understanding of the embodiments can be achieved by referring to the following detailed description in conjunction with the accompanying drawings. It is emphasized that the various components are not necessarily drawn to scale. In fact, dimensions may be arbitrarily increased or decreased for clarity of discussion. In the drawings, the same reference numerals refer to the same elements.

[0014] Figure 1 This is a front view of the handheld band saw of the present invention;

[0015] Figure 2 This is a side view of the handheld band saw of the present invention. Detailed Implementation

[0016] Below, we will refer to Figure 1 and Figure 2 This invention describes a handheld band saw. The following description is merely exemplary and does not constitute a limitation on the disclosure of this application or the application or use of this invention. The terms "front," "rear," "above," "below," "left," and "right" used throughout this specification are used to define various parts of the handheld band saw of this invention when positioned in the orientation in which it is intended to be used.

[0017] refer to Figure 1 and Figure 2As an example, the band saw 1 of the present invention is a rechargeable handheld band saw. The band saw 1 includes a generally C-shaped frame 10 with a substantially planar surface. The substantially planar frame 10 defines a first plane P1. The frame 10 has opposing first ends 11 and second ends 12, which are connected by a transverse member 13, and an opening 14 for receiving a workpiece is provided between the first ends 11 and the second ends 12 on the side opposite to the transverse member. The first end 11 houses a drive wheel having a first axis of rotation; the second end 12 houses a driven wheel having a second axis of rotation. The drive wheel is connected to a motor (not shown) via a transmission device, the motor being housed within a motor housing 16 extending from the upper surface of the first end 11. The driven wheel is connected to a journal disposed on the bottom surface of the second end 12 of the frame 10 via a tensioning assembly (not shown) mounted on the frame 10, such that the driven wheel can rotate under the drive of the drive wheel.

[0018] A band saw blade 15 of a certain width, flexible in the plate thickness direction, is mounted between the drive wheel and the driven wheel. The band saw blade 15, forming a closed loop, surrounds the drive wheel and the driven wheel. The band saw blade 15 extends parallel to the axial direction of the first rotation axis in most areas, but is only twisted by a guide member (not shown) in the opening area, thus exposing an inclined portion within the opening 14. The exposed inclined portion of the band saw blade defines a cutting plane CP, which is different from and at an angle to the first plane P1 of the basic planar frame. The band saw blade 15, rotating around the drive wheel, presses against the workpiece (not shown) to cut it through the inclined portion exposed in the opening area.

[0019] A handle assembly for user gripping is provided on the upper part of the frame 10. The handle assembly includes a main handle 20 for one-handed gripping and an auxiliary handle 30 for the other-handed gripping. The main handle 20 is generally positioned rearward from the cut portion in the opening 14, extending forward and upward in a mountain shape from the side of the frame 10 where the motor housing 16 is mounted, forming a first grip portion 21 for one-handed gripping. The direction in which the main handle 20 extends upward from the frame 10 defines a second plane P2, which is substantially parallel to the cut plane CP. According to an illustrative embodiment of the invention, preferably, the handle axis HH of the first grip portion 21 is inclined upward from the rear to the front. It slopes downward at the top end 22 to form a front end 23 until it is attached to the handle base 24. The handle base 24 is fixed to the upper surface attached to the frame 10 by screws. A switch 25 is provided on the lower surface side of the first grip portion 21, which is operated by the fingertips of the hand holding the main handle 20. When the user operates switch 24, the motor starts, causing the band saw blade 15 to rotate. The user, holding the main handle 20, applies pressure (the cutting force of the band saw blade 15 on the material being cut) in a direction approximately perpendicular to the handle axis HH. This ensures that the direction in which the band saw blade 15 cuts into the workpiece is the same as the direction of the user's pressing pressure. Therefore, the pressing pressure from the user's hand holding the main handle 20 can be effectively applied to the cutting area, reducing the burden on the user's wrist while allowing for quick and easy cutting.

[0020] An auxiliary handle 30 is positioned in front of the main handle 20. The auxiliary handle 30 includes a first end 31 located directly in front of the first grip portion 21 and intersecting with a second plane, and a second grip portion 32 extending from the first end 31 toward the cutting plane. Preferably, the first end 31 is perpendicular to the second plane P2, and the center of the first end 31 lies on the second plane P2. The first end 31 is connected to the front end portion 23 of the main handle 20 via a connecting portion 26. Preferably, the connecting portion 26 also extends within the second plane P2, that is, the center of the first end 31, the connecting portion 26, the front end portion 23, and the first grip portion 21 are coplanar, and the second plane P2 is parallel to the cutting plane CP.

[0021] According to an illustrative embodiment of the present invention, the first end portion 31 is configured as a spherical handle, and the center of the first end portion 31 is in the second plane. The first end portion 31 configured as a spherical handle allows the hands holding the first end portion 31 and the first grip portion 21 to press the band saw downwards more effectively when the band saw 1 is processing a workpiece in the downward direction, thereby improving cutting efficiency and user-friendliness.

[0022] The second grip portion 32 extends from one side of the first end 31 toward the cutting plane CP. It is understood that the second grip portion 32 can have various shapes and angles of extension. The shape and angle of extension of the second grip portion 32 depend on the structural design of the band saw and the ergonomics of the band saw application. For example, the second grip portion 32 can be a generally cylindrical handle extending substantially perpendicular to the second plane P2, with an arc transition from the first end 31 to the second grip portion 32. The cross-sectional diameter of the second grip portion is preferably between 15 mm and 35 mm to improve the user's grip comfort. Alternatively, the second grip portion 32 can be an L-shaped, C-shaped, or D-shaped handle. According to a preferred embodiment of the invention, the second grip portion 32 is curved, particularly arc-shaped, extending from the first end 31 to the second end 33. The line connecting the two ends of the arc of the second grip portion forms an angle α with the second plane, preferably ranging from 15° ≤ α ≤ 90°. In this way, the auxiliary handle is designed to be more ergonomic, and the band saw has a compact body, which can meet the needs of operation in confined spaces.

[0023] Preferably, the auxiliary handle 30 further includes a second end 33 connecting the second grip portion 32 to the frame 10. This provides better rigidity for the auxiliary handle. The second end 33 is connected to the frame near the opening 14. For ergonomic reasons, the second end 33 is designed as close as possible to the cutting point to provide better support while meeting safety regulations.

[0024] The main handle 20 and / or auxiliary handle 30 are equipped with sensors for detecting the user's grip status. For example, a first sensor is disposed on the first grip portion 21, which can detect the user's first hand on the first grip portion 21. Touch sensors (such as capacitive touch sensors or inductive touch sensors) are disposed on the second grip portion 33 and the first end portion 31, respectively. The touch sensors are configured to detect the user's second hand located on the second handle. The band saw includes a controller that controls the operation of the motor and monitors the activation status of the first sensor and the touch sensor. When either the touch sensor on the second grip portion 33 or the first end portion 31 is activated and the first sensor is also activated, the controller drives the motor. When the first sensor is activated and neither the touch sensor on the second grip portion 33 nor the first end portion 31 detects the user's other hand gripping the auxiliary handle 30, the controller disables the motor.

[0025] This invention provides a novel design for an auxiliary handle 30, combining a ball handle located in front of the main handle 20 and a secondary handle located on the side of the frame into an integrated auxiliary handle. This simple and compact structure simultaneously meets the user's operational needs for using the band saw in different processing positions. When the handheld band saw 1 needs to process the workpiece downwards, the user can hold the first grip portion 21 of the main handle 20 with one hand and grasp the first end 31 of the auxiliary handle 30 with the other. Since both the first end 31 and the first grip portion 21 are within a second plane P2 parallel to the cutting plane CP, when the user presses down on the main handle 20 and the auxiliary handle 30, the inclined portion of the band saw blade 15 exposed in the opening 14 can cut the workpiece downwards substantially vertically, improving cutting efficiency and accuracy. When the handheld band saw 1 needs to process the workpiece forwards or upwards, the user can hold the first grip portion 21 of the main handle 20 with one hand and grasp the second grip portion 32 of the auxiliary handle 30 with the other. The angled second grip portion provides more effective support when the band saw is processing forwards or upwards. Users can quickly select different grip points according to their actual needs, and do not need to make any mechanical adjustments to the auxiliary handle itself to meet the operation needs of different positions.

[0026] As mentioned above, although exemplary embodiments of the present invention have been described in the specification with reference to the accompanying drawings, the present invention is not limited to the specific embodiments described above, and there may be many other embodiments. The scope of the present invention should be defined by the claims and their equivalents.

Claims

1. A hand-held band saw comprising a substantially planar frame, the frame housing a drive wheel and a driven wheel, wherein the drive wheel and driven wheel engage an endless saw blade, the frame defining a first plane; the frame further provided with an opening for receiving a workpiece, the endless saw blade exposing an angled portion within the opening; the angled portion defining a cutting plane, the band saw further comprising a primary handle extending upwardly and outwardly from the frame and a secondary handle located forwardly of the primary handle, wherein, The main handle comprises a first grip portion extending along a second plane parallel to the cutting plane, characterized in that the auxiliary handle comprises a first end portion located in front of the first grip portion and intersecting the second plane, and a second grip portion extending from the first end portion towards the cutting plane.

2. The hand-held band saw of claim 1, wherein, The auxiliary handle further comprises a second end portion connecting the second grip portion to the frame.

3. The hand-held band saw of claim 2, wherein, The second end portion is connected to the frame adjacent to the opening.

4. The hand-held band saw of claim 3, wherein, The second grip portion extends from the first end portion to the second end portion in a curved shape.

5. The hand-held band saw of claim 4 wherein, The second grip portion is generally arcuate, and a line connecting two ends of the arc of the second grip portion forms an angle a with the second plane, 15°≤a≤90°.

6. A hand-held band saw as claimed in any one of claims 1-5, characterized in that The first end portion is centered in the second plane.

7. The hand-held band saw of claim 6 wherein, The first end portion is connected to the main handle by a connecting portion.

8. The hand-held band saw of any one of claims 1-7, wherein, The main handle and / or the auxiliary handle is provided with a sensor for detecting the gripping state of the user.

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