Brush cutter

Abstract

The utility model provides a brush cutter. The brush cutter comprises a handle assembly and a working head assembly. The work head assembly includes a work implement and a bevel pinion extending from a first end to a beveled end, where the beveled end is functionally coupled to the work implement, where the bevel pinion is supported in a cavity by first and second bearings disposed about an outer surface of the bevel pinion, and where the first and second bearings are separated by a gap. The brush cutter further comprises a shaft at least partially extending between the handle assembly and the working head assembly. And a power device operable to rotate the bevel pinion to actuate the work implement.

Description

Technical Field

[0001] The present invention relates generally to brush cutters, and more particularly to mechanical support features for brush cutters. Background Art

[0002] Power tools are often used to reduce the physical labor required when performing manual work. For example, brush cutters, trimmers, edgers, etc. (collectively referred to herein as brush cutters) can be used to trim grass, weeds, bushes, or trees. Brush cutters typically use a working tool such as a high-speed rotating trimming line or blade to cut branches and leaves. The actuation of the working tool can be selectively driven by the operator using a trigger or other similar device. However, brush cutters may become very heavy and inconvenient for the operator to hold after prolonged operation. In addition, as the size and power of the brush cutter increase, stress may increase at one or more locations along the shaft or interconnecting components.

[0003] Therefore, alternative mechanical support features for brush cutters that provide better operational control or mechanical integrity are welcome in the art. Utility Model Content

[0004] The inventive aspects and advantages of the present disclosure will be set forth in part in the following description, or may be obvious from the description, or may be learned through practice of the present technology.

[0005] According to one embodiment, a brush cutter is provided. The brush cutter includes a handle assembly and a working head assembly. The working head assembly includes a working tool and a pinion bevel gear extending from a first end to a bevel end, wherein the bevel end is functionally coupled to the working tool, wherein the pinion bevel gear is supported in a cavity by a first bearing and a second bearing arranged around an outer surface of the pinion bevel gear, and wherein the first bearing and the second bearing are separated by a gap. The brush cutter also includes a shaft extending at least partially between the handle assembly and the working head assembly; and a power device operable to rotate the pinion bevel gear to actuate the working tool.

[0006] According to another embodiment, a brush cutter includes a handle assembly; a work head assembly including a work implement; a shaft extending at least partially between the handle assembly and the work head assembly; a power device operable to actuate the work implement; and a clip assembly capable of being releasably secured to the brush cutter. The clip assembly includes a first base; a second base pivotally connected to the first base, wherein the first base and the second base define an internal cavity for receiving the brush cutter; a ring pivotally connected to the first base; and a stop configured to limit a maximum degree of rotation of the ring relative to the first base.

[0007] According to another embodiment, a brush cutter is provided. The brush cutter includes a handle assembly; and a working head assembly. The working head assembly includes a working tool; and a bevel gear box. The brush cutter also includes a shaft extending at least partially between the handle assembly and the working head assembly, wherein the shaft extends into the bevel gear box; a tubular spacer disposed between the shaft and the bevel gear box; and a power device operable to actuate the working tool.

[0008] According to another embodiment, a handle assembly for a brush cutter is provided. The handle assembly includes an elongated rod terminating at an end surface; and a grip at least partially surrounding the elongated rod and the end surface, wherein the grip includes a protrusion extending from an inner surface of the grip into the end surface of the elongated rod to prevent rotation of the grip relative to the elongated rod.

[0009] According to another embodiment, a brush cutter is provided. The brush cutter includes a handle assembly, the handle assembly including an elongated rod terminating at an end face; and a grip at least partially surrounding the elongated rod and the end face, wherein the grip includes a protrusion extending from an inner surface of the grip into the end face of the elongated rod to prevent rotation of the grip relative to the elongated rod. The brush cutter also includes a working head assembly, the working head assembly including a working tool; and a pinion gear extending from a first end to a bevel end, wherein the bevel end is functionally coupled to the working tool, wherein the pinion gear is supported in a cavity by a first bearing and a second bearing arranged around an outer surface of the pinion gear, and wherein the first bearing and the second bearing are separated by a gap. The brush cutter also includes a shaft extending at least partially between the handle assembly and the working head assembly; a power device operable to rotate the pinion gear to actuate the working tool; and a clip assembly capable of being releasably fixed to the brush cutter. The clip assembly includes a first base; a second base pivotably connected to the first base, wherein the first base and the second base define an internal cavity for receiving the brush cutter; a ring pivotably connected to the first base; and a stop configured to limit the degree of rotation of the ring relative to the first base.

[0010] These features, aspects and advantages of the present invention and other features, aspects and advantages can be better understood by referring to the following description and the appended claims. The accompanying drawings, which are incorporated in this specification and constitute a part thereof, illustrate embodiments of the present technology and, together with the specification, are used to explain the principles of the present technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The complete disclosure of the present invention, including the best way to produce and use the system and method of the present invention, is described in this specification with reference to the accompanying drawings to guide ordinary technicians in the field. In the accompanying drawings:

[0012] Figure 1 is a perspective view of a brush cutter according to an embodiment of the present disclosure;

[0013] Figure 2 is a perspective view of a handle assembly of a brush cutter according to an embodiment of the present disclosure;

[0014] Figure 3 is a perspective view of a clip assembly of a brush cutter according to an embodiment of the present disclosure;

[0015] Figure 4 According to the embodiment of the present disclosure Figure 3 a side view of a clip assembly having a ring that pivots between a first position and a second position;

[0016] Figure 5 According to the embodiment of the present disclosure Figure 3 An internal cross-sectional view of a clamp assembly;

[0017] Figure 6 is an internal cross-sectional view of a portion of a working head assembly of a brush cutter according to an embodiment of the present disclosure;

[0018] Figure 7 is another internal cross-sectional view of a portion of a work head assembly according to an embodiment of the present disclosure;

[0019] Figure 8 is a perspective view of a work head assembly according to an embodiment of the present disclosure; and

[0020] Fig. 9 is a perspective view of a work head assembly with a bevel gear box removed according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0021] Reference will now be made in detail to embodiments of the utility model, one or more examples of which are shown in the accompanying drawings. The word "exemplary" is used herein to mean "used as an example, instance or illustration". Any embodiment described herein as "exemplary" is not necessarily preferred or advantageous compared to other embodiments. In addition, each example is only for explanatory purposes and does not constitute a limitation of the present technology. In fact, it is obvious to those skilled in the art that various modifications and changes can be made to the present technology without departing from the scope and spirit of the claimed technology. For example, a feature shown or described as part of one embodiment can also be used in combination with another embodiment to produce another different embodiment. Therefore, the present disclosure is intended to cover such modifications and changes that fall within the scope of the attached claims and their equivalents. The detailed description uses numbers and letter marks to refer to features in the drawings. The same or similar marks in the drawings and the specification are used to refer to the same or similar parts of the utility model.

[0022] As used herein, the terms "first", "second" and "third" can be used interchangeably to distinguish one component from another, and are not intended to express the position or importance of each component. Unless the context clearly stipulates otherwise, the singular forms "one", "an" and "said" include plural references. Unless otherwise specified in this article, the terms "coupled", "fixed", "attached" and the like refer to direct coupling, fixing or attachment, and indirect coupling, fixing or attachment realized by one or more intermediate components or features. As used herein, the terms "include", "comprise", "include", "have" or any other variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, article or device including a series of features is not necessarily limited to these features, and may also include other features that are not explicitly listed or inherent to such a process, method, article or device. In addition, unless otherwise clearly stated, "or" refers to inclusive rather than exclusive or. For example, any of the following satisfies condition A or B: A is true (or exists), B is false (or does not exist), A is false (or does not exist) and B is true (or exists), and both A and B are true (or exist).

[0023] Approximate terms such as "about," "approximately," "approximately," or "substantially" include values ​​within 10% greater or less than the stated value. When used in the context of an angle or direction, such terms include values ​​within 10 degrees greater or less than the stated angle or direction. For example, "approximately perpendicular" includes directions within 10 degrees of perpendicular in any direction (e.g., clockwise or counterclockwise).

[0024] As used herein, the term "power tool" refers to a device used to perform work operations, such as cutting grass, weeds, bushes, shrubs, etc. As non-limiting examples, power tools may include brush cutters, trimmers, edgers, hedge trimmers, string trimmers, cutters, etc. Although the embodiments provided below are directed to brush cutters, one or more components of the brush cutters described below (e.g., handle assemblies, clamp assemblies, or work head assemblies) may be used in conjunction with one or more different types of power tools.

[0025] As used herein, the term "actuation" and variations thereof refer to any physical manipulation of a component. Actuation may include, for example, rotating, reciprocating, translating, or otherwise moving a component such as a working tool (eg, a string, blade, disk, etc.).

[0026] As used herein, the term "functionally coupled" and variations thereof are intended to refer to any direct or indirect connection between two or more components for transmitting motion therebetween. Functionally coupled, for example, may include two directly adjacent components mechanically engaging each other so that when one component moves (e.g., rotates), the other component is also carried along in motion. Functionally coupled, for example, may also include two components being connected via one or more intermediate components so that the motion of one component is transmitted to the second component via the one or more intermediate components (e.g., one or more intermediate gears, shafts, etc.).

[0027] The benefits, other advantages and technical solutions to the problems of the present invention will be described below with reference to specific embodiments. However, these benefits, advantages, technical solutions to the problems, and any features that may bring any benefits, advantages or technical solutions or make them more obvious should not be understood as the key, necessary or essential features of any or all claims.

[0028] Brush cutters and other power tools provide a power-assisted tool for an operator to perform a task. For example, a brush cutter may include a power device functionally connected to a work tool. The power device may be selectively actuated by an operator to selectively actuate (e.g., rotate) the work tool. As brush cutters and other power tools increase in size and power, ease of use may decrease, while mechanical stress may increase.

[0029] In general, a brush cutter according to one or more embodiments described herein includes a housing, a handle assembly, and a working head assembly. The brush cutter may include one or more components to facilitate handling and operation of the brush cutter. For example, the handle assembly may include one or more handles having one or more protrusions extending from the grip to an end face of an elongated rod supporting the grip. The one or more protrusions can prevent or reduce rotation of the grip relative to the elongated rod. In addition, the brush cutter may include a clip assembly with a pivotable ring for supporting an external attachment, such as a belt. The clip assembly may include a stop to mechanically limit the degree of rotation of the ring. In addition, the working head assembly may include one or more components to facilitate functional connection between the power device and the working tool. For example, the working head assembly may include a pinion bevel gear supported by a first bearing and a second bearing, the first bearing and the second bearing being separated by a gap. By separating the first bearing and the second bearing, the load caused by the working head assembly can be better distributed. The work head assembly may also include a tubular spacer to help fill voids in the work head assembly, such as between a bevel gearbox and a shaft. These support features, whether used alone or in combination, can improve operator convenience and improve the structural integrity of the entire brush cutter by improving load distribution.

[0030] Now referring to the accompanying drawings, Figure 1 A brush cutter 10 is shown that generally includes a housing 100, a handle assembly 200, and a working head assembly 300. An axis 50 extends between two or more components of the brush cutter 10, such as at least partially between the handle assembly 200 and the working head assembly 300. Although the illustrated device is generally referred to herein as a "brush cutter," it should be understood that this is a term of convenience and may additionally or alternatively include a trimmer, an edger, a hedge trimmer, a string trimmer, a cutter, or other similar devices or power tools having alternative names.

[0031] In this regard, the working head assembly 300 may include a working tool 310, which can be used to trim grass, weeds, bushes, shrubs, etc. The working head assembly 300 and the working tool 310 may include a variety of different types of tools, such as blades, cords, discs, cutters, etc. For example, in some embodiments, the working tool 310 of the brush cutter 10 may include a disc having a sharp outer edge and one or more teeth that may be present. Thus, the working head assembly 300 is capable of rotating the disc at high speed to cut debris. In some embodiments, the brush cutter 10 may include a string trimmer, wherein the working tool 310 is an elongated cord extending from a central body. The working head assembly 300 is thereby capable of rotating its central body at high speed, thereby rotating the elongated cord at high speed to cut debris. Although certain types of brush cutters 10 are explicitly disclosed herein, it should be understood that these embodiments are not limiting and other embodiments may be implemented within the scope of the present disclosure.

[0032] In various configurations, the brush cutter 10 may include a housing 100, a handle assembly 200, and a working head assembly 300. For example, Figure 1 As shown, the brush cutter 10 can generally extend from a first end 11 to a second end 12. In such an embodiment, the housing 100 can generally be arranged around the first end 11 of the brush cutter 10, and the working head assembly 300 can be arranged around the second end 12 of the brush cutter 10. The handle assembly 200 can be arranged between the first end 11 and the second end 12 of the brush cutter 10, as shown.

[0033] In addition, the housing 100, the handle assembly 200 and the working head assembly 300 may include separate components, or may be combined with each other. Figure 1 As shown, the handle assembly 200 can extend directly from the housing 100. In such an embodiment, the shaft 50 can thereby extend away from the handle assembly 200 and toward the working head assembly 300. However, in some embodiments, the handle assembly 200 can be located at a position along the shaft 50 that is separate from the housing. In other embodiments, the housing 100 can be arranged between the handle assembly 200 and the working head assembly 1300.

[0034] In some embodiments, the brush cutter 10 may also include a guard 302 configured to protect an operator from flying debris kicked up by the working head assembly 300. In some cases, the guard 302 may be engaged with the shaft 50 and disposed adjacent the working head assembly 300.

[0035] Continue to refer Figure 1, the housing 100 may include one or more components to facilitate operation of the brush cutter 10. For example, in some embodiments, the brush cutter 10 may include a power unit 110, such as an electric motor or an internal combustion engine. The housing 100 of the brush cutter 10 may thus include the power unit 110. In other embodiments, the power unit 110 may be located elsewhere around the brush cutter 10, such as separate from or remote from the housing 100.

[0036] The housing 100 may additionally or alternatively include a power source for the power device. Figure 1 As shown, the housing 100 may include a battery receiving area 120 that receives a battery 125 to power the electric motor. Alternatively or additionally, the housing 100 may include a fuel tank for storing gasoline to power the internal combustion engine. Using the power source, the power device 110 can thereby drive the working head assembly 300, for example, by rotating the working tool 310 of the working head assembly 300.

[0037] Although Figure 1 Housing 100 is shown including a battery receiving area 120 with a battery 125, but the housing may additionally or alternatively include a variety of other components for operating brush cutter 10 in addition to housing power unit 110. For example, housing 100 may include one or more display devices, user interfaces, or other components.

[0038] The brush cutter 10 may also include a handle assembly 200. The handle assembly 200 may include one or more handles to help a user pick up, hold, manipulate and / or operate the brush cutter 10. The handle assembly 200 may be located at any suitable location along the brush cutter 10. For example, Figure 1 As shown, the handle assembly 200 can extend from the housing 100 and be disposed between the housing 100 and the working head assembly 300. In other embodiments, the handle assembly 200 can extend from the housing 100 in different directions, or be located at other locations on the brush cutter 10, such as behind the housing 100, so that the housing 100 is located between the handle assembly 200 and the working head assembly 300. In some embodiments, the brush cutter 10 can include multiple handle assemblies 200, for example, one handle assembly 200 is located at the first end 11 of the brush cutter 10, and one handle assembly 200 is located between the housing 100 and the working head assembly 300.

[0039] The handle assembly 200 may include, for example, one or more handles extending away from the brush cutter. Figure 1 As shown, the handle assembly 200 may include a first handle 210 on a first elongated rod 211 and a second handle 220 on a second elongated rod 221 .

[0040] Additional references Figure 2 , shows an enlarged view of the handle assembly 200, which is shown to include a first handle 210 and a second handle 220. An operator may hold and / or control the brush cutter 10 using the first handle 210, the second handle 220, or any other handles.

[0041] For example, in some embodiments, the handle assembly 200 may include a grip 214 to facilitate an operator to hold the brush cutter 10. Figure 2 As shown, the first handle 210 may include a first elongated rod 211 defining an interior 212 (e.g., a hollow interior) and terminating at an end face 213. The end face 213 may include a solid or substantially solid face. The first handle 210 may also include a grip 214 that at least partially surrounds the first elongated rod 211 and the end face 213. The grip 214 may include one or more materials or contours that facilitate gripping by an operator. For example, the grip 214 may include rubber or foam material. In addition, the grip may include a contoured grip, such as a contoured grip that is shaped to receive a hand that is wrapped around the grip 214.

[0042] The first handle 210 may also include one or more features to prevent or limit rotation of the grip 214 relative to the first elongated shaft 211. For example, Figure 2 As shown, the handle 214 may include a protrusion 215 extending from the inner surface of the handle 214 into the end surface 213 of the first elongated rod 211. By mechanically interconnecting the handle 214 and the first elongated rod 211 via the protrusion 215, the handle 214 can be fixed in place and cannot rotate around the first elongated rod 211. In other words, the protrusion 215 can prevent the handle 214 from rotating relative to the first elongated rod 211.

[0043] In some embodiments, protrusion 215 may include an asymmetric shape. For example, protrusion 215 may have a width or length that is longer than the other, such as an elongated ridge or a rectangular box. The asymmetric shape can help resist rotation by not rotating in a hole in the end face 213 that is complementary to the shape of protrusion 215.

[0044] In some embodiments, the handle 214 may include a plurality of protrusions 215 extending from the inner surface of the handle 214 into the end surface 213 of the first elongated rod 211. For example, the handle 214 may include three or more protrusions 215 extending into or through the end surface 213 of the first elongated rod 211, such that the plurality of protrusions 215 collectively prevent the handle 214 from rotating relative to the first elongated rod 211.

[0045] While the grip 214 is shown as being located on the first handle 210 of the handle assembly 200, it should be understood that the handle assembly 200 may also include one or more additional grips, such as on one or more additional handles, without departing from the scope of the present disclosure.

[0046] Still reference Figure 2 , the handle assembly 200 may include a second handle 220 that is configured the same as or different from the first handle 210. For example, in some embodiments, the first handle 210 and the second handle 220 may each include a grip with or without an anti-rotation feature. Figure 2 In the illustrated embodiment, the second handle 220 may include one or more handles for controlling the brush cutter 10 ( Figure 1 ) operation. For example, the second handle 220 may include an actuator 225 that allows the operator to selectively control the brush cutter 10. The control features may also include other control features that allow the operator to make changes to the brush cutter 10. For example, as a non-limiting example, the control features on the handle assembly 200 may include a cruise control feature that allows the operator to maintain the operating speed of the work head assembly, a turbine that allows the brush cutter 10 to reach full operating speed, a power switch with at least on and off functions, a safety switch, or any other desired user control features.

[0047] Reference again Figure 1 , the brush cutter 10 can include one or more additional features to assist the operator in supporting the brush cutter 10. For example, in some embodiments, the brush cutter 10 can include a clip assembly 250. The clip assembly 250 can generally provide an anchor point to which one or more additional support members can be releasably attached. For example, the clip assembly 250 can include a location to which a protective belt (not shown) can be releasably clamped. The protective belt can then be wrapped around the operator to help distribute the load of the brush cutter 10.

[0048] In some embodiments, for example, Figure 1 In the illustrated embodiment, the clip assembly 250 can be arranged on the brush cutter 10 on or around the handle assembly 200, such as between the handle assembly 200 and the housing 100. In some embodiments, the clip assembly 250 can be arranged around the shaft 50, such as between the handle assembly 200 and the working head assembly 300. In other embodiments, the brush cutter 10 can include multiple clip assemblies 250, such as arranged at one or more locations on or around the shaft 50, the handle assembly 200, and / or the housing 100.

[0049] refer to Figure 3, a perspective view of a clip assembly 250 around a portion of the brush cutter 10 (e.g., the handle assembly 200) is shown. The clip assembly 250 may include a first base 251 and a second base 252 pivotally connected to each other. That is, for example, the second base 252 may be pivotally connected to the first base 251 at a pivotable connection 253.

[0050] The first base 251 and the second base 252 are combined to define an internal cavity 254. The internal cavity 254 may include any size and shape suitable for receiving the brush cutter 10. For example, Figure 3 As shown, the internal cavity 254 can be sized and shaped such that it is suitable for receiving a portion of the handle assembly 200. Alternatively or additionally, the internal cavity 254 can be sized and shaped such that it is suitable for receiving a shaft of the brush cutter 10.

[0051] The clip assembly 250 may include a loop 255. The loop 255 may provide an attachment point for an external component (eg, a belt) for use by an operator. For example, an operator may wear a belt that may be releasably attached to the loop 255.

[0052] The ring 255 can be pivotally connected to the clip assembly 250, such as by being pivotally connected to the second base 252 of the clip assembly 250 at a pivotable connection 256. The clip assembly 250 can also include a stop 257 configured to limit the degree of rotation of the ring 255 relative to the second base 252, for example.

[0053] refer to Figure 4 , a side view of the clip assembly 250 is shown to illustrate its maximum rotation angle A, wherein the ring 255 pivots between the first position and the second position. As shown, the ring 255 can be pivotally connected to the first base 251 of the clip assembly 250 at the pivotable connection 256. However, the stop 257 can be configured to limit the maximum rotation angle A around the pivotable connection 256. That is, as Figure 4 As shown, the ring 255 can only rotate between positions located along the maximum rotation angle A, so that the ring 255 cannot rotate beyond the limit position. When the ring 255 reaches the end position, the stopper 257 can abut against the clip assembly 250, such as against the second base 252 of the clip assembly 250, thereby limiting any further rotation of the ring 255.

[0054] Limiting the maximum rotation angle A of the ring 255 can assist the operator by preventing the brush cutter 10 from being repositioned to an undesirable position or by preventing components attached to the ring 255 (e.g., a belt) from interfering with other components of the brush cutter. In some embodiments, the maximum rotation angle A of the ring 255 about the pivotable connection 256 can be 20 degrees or less. In some embodiments, the maximum rotation angle A of the ring 255 about the pivotable connection 256 can be 15 degrees or less. In other embodiments, the maximum rotation angle A of the ring 255 about the pivotable connection 256 can be 10 degrees or less.

[0055] refer to Figure 5 , showing an internal view of the clip assembly 250. The clip assembly 250 can be secured to the brush cutter via a fastener 260. The fastener 260 can include any component suitable for releasably securing the first base 251 and the second base 252 in a closed position around the brush cutter. For example, Figure 3 and Figure 5 As best shown, the fastener 260 can include a screw having a threaded portion that is received by the second base 252 of the clip assembly 250. The shaft of the fastener can extend away from the threaded portion and through a cavity in the first base 251 of the clip assembly 250. Finally, the head of the fastener 260 can remain outside of the first base 251 so that a user can tighten the fastener 260 by rotating the head of the fastener 260.

[0056] In some embodiments, the clip assembly 250 is configured such that even when the clip assembly 250 is in a closed configuration around the brush cutter (e.g., the fastener 260 is tightened), a gap 265 remains between the end of the first base 251 and the end of the second base 252. For example, the first base 251 and the second base 252 are sized so that their free ends do not touch when wrapped around the brush cutter. The gap 265 can allow for additional clearance around the brush cutter during installation, for example, by accommodating possible mismatches and providing greater tolerance when securing the fastener 260.

[0057] In such an embodiment, the clip assembly 250 may further include an overhang 261 that covers at least a portion of the gap 265. For example, Figure 3 and Figure 5 As best shown, the overhang 261 can extend from the first base 251 over the gap 265 and partially over the second base 252. The overhang 261 can thereby visually obscure the gap 265 and / or reduce the amount of debris that interacts with the exposed portion of the fastener 260.

[0058] Although Figure 3-5The illustrated clip assembly 250 is presented as a two-piece structure, but it should be understood that other configurations may be implemented within the scope of the present disclosure. For example, the clip assembly 250 may include three or more different components connected via one or more joints. Likewise, while the illustrated clip assembly 250 includes a fastener 260 that passes through the first base 251 and enters the second base 252, alternative installation directions may also be implemented.

[0059] Reference again Figure 1 , the brush cutter 10 may include one or more components to functionally connect the power device 110 to the work tool 310. That is, the brush cutter 10 may include one or more components to convert motion from the power device 110 to actuate (eg, rotate) the work tool 310.

[0060] refer to Figure 6 , showing an internal cross-sectional view of a working head assembly 300, the working head assembly 300, for example, Figure 1 The working head assembly 300 can include a plurality of interconnected components to functionally connect the power device to the working tool. For example, as shown in the figure, the working head assembly 300 can include a small bevel gear 320. The small bevel gear 320 can extend from a first end 321 to a bevel end 322. The small bevel gear 320 can be fixed to one or more components in the shaft, which are in turn connected to the power device. Therefore, when the power device is activated, the small bevel gear 320 can rotate accordingly. In some embodiments, the small bevel gear 320 can extend in a direction substantially parallel to the shaft.

[0061] The small bevel gear can be arranged in the cavity 327. The cavity 327 can be formed in the work head assembly 300, in the shaft ( Figure 1 ) or in a combination thereof. For example, Figure 6 As shown, the work head assembly 300 may include a bevel gear box 325. The bevel gear box 325 may include a structure for housing the bevel pinion 320 and other related components that may be present.

[0062] To allow the pinion bevel gear 320 to rotate in the cavity 327, the pinion bevel gear 320 may be supported in the cavity 327 by one or more bearings, such as a first bearing 323 and a second bearing 324. The first bearing 323 and the second bearing 324 may be arranged around the outer surface of the pinion bevel gear 320, for example, between the pinion bevel gear 320 and the bevel gear box 325.

[0063] In some embodiments, the first bearing 323 and the second bearing 324 can be separated by a gap 329. That is, the first bearing 323 and the second bearing 324 can be spaced apart from each other so that they are separated by a certain distance. For example, the first bearing 323 can be arranged at the first end 321 of the pinion bevel gear 320. Additionally or alternatively, the second bearing 324 can be arranged at the bevel end 322 of the pinion bevel gear 320. By separating the first bearing 323 and the second bearing 324 with the gap 265, the stress caused by the working head assembly 300 on the rest of the brush cutter 10 (e.g., the bevel gear box or the shaft) can be distributed along a larger distance.

[0064] Still reference Figure 6 , the working head assembly 300 may include one or more additional components to functionally connect the pinion bevel gear 320 to the working tool. For example, the working head assembly 300 may include an output shaft 340 fixed to the working tool. The working head assembly 300 may also include a bevel gear 330 connected (e.g., pinned) to the output shaft 340. For example, the bevel gear 330 may be connected to the outer surface of the output shaft 340. The bevel gear 330 may mesh with the pinion bevel gear 320 for transmitting rotational energy therebetween. That is, when the pinion bevel gear 320 is rotated by the power device, the pinion bevel gear 320 rotates the bevel gear 330. Since the output shaft 340 is connected to the bevel gear 330, the output shaft 340 also rotates. Finally, since the working tool 310 is fixed to the output shaft 340, the working tool 310 is also actuated (e.g., rotated) by the rotation of the output shaft 340.

[0065] refer to Figure 7 , showing an internal cross-section of a portion of the working head assembly 300. Since the first bearing 323 is separated from the second bearing 324 ( Figure 6 ), so the first bearing 323 can be closer to the first end 321 of the small bevel gear 320. In addition, the bevel gear box 325 can define a cavity 327 to accommodate the first bearing 323. However, since the size of the cavity 327 is set to accommodate the first bearing 323, the cavity 327 may create a gap between the bevel gear box 325 and the shaft. For example, referring to Figure 8 , shows an external perspective view of the working head assembly 300. As shown, the shaft 50 can be inserted into the bevel gear box 325, and since the bevel gear box 325 also accommodates the first bearing 323, the bevel gear box 325 can have a gap between the two components.

[0066] Additional references Figure 8 , showing a perspective view of a portion of the work head assembly 300 with the bevel gear box 325 removed. In order to fill the cavity 327 ( Figure 7), a tubular spacer 350 may be arranged between the shaft 50 and the bevel gear box 325 or other components of the work head assembly 300. For example, the tubular spacer 350 may be arranged at one end of the shaft 50 in the work head assembly 300.

[0067] The tubular gasket 350 can be fixed to the outer surface of the shaft 50, such as by clamping, fastening, etc. In addition, the tubular gasket 350 can include a solid structure and completely cover a portion of the shaft 50, or the tubular gasket 350 can include a structure with one or more voids (e.g., gaps, holes, grooves, etc.) so that the tubular gasket 350 only covers a portion of the surface of the shaft 50. The tubular gasket 350 can completely or partially fill the space between the shaft 50 and the work head assembly 300 (e.g., bevel gear box 325). As a result, the tubular gasket 350 can help distribute stress, promote a tighter connection, and reduce potential wobble between the corresponding components.

[0068] Although various components and features for brush cutters or other power tools are disclosed herein, these features are not mutually exclusive and can be combined in any suitable combination. In addition, although the power tool is exemplarily shown as a brush cutter, the power tool can also include one or more other types of power tools, or can include a brush cutter with one or more other configurations.

[0069] Other aspects of the present invention are provided by one or more of the following embodiments:

[0070] A brush cutter includes a handle assembly and a work head assembly. The work head assembly includes a work tool and a pinion bevel gear extending from a first end to a bevel end, wherein the bevel end is functionally coupled to the work tool, wherein the pinion bevel gear is supported in a cavity by a first bearing and a second bearing arranged around an outer surface of the pinion bevel gear, and wherein the first bearing and the second bearing are separated by a gap. The brush cutter also includes a shaft extending at least partially between the handle assembly and the work head assembly; and a power device operable to rotate the pinion bevel gear to actuate the work tool.

[0071] The brush cutter according to any one of the items herein, wherein the working head assembly further comprises an output shaft fixed to the working tool; and a bevel gear connected to an exterior of the output shaft and meshing with the bevel pinion gear.

[0072] A brush cutter as claimed in any one of the preceding clauses, wherein the bevel pinion extends in a direction substantially parallel to the shaft.

[0073] A brush cutter as claimed in any one of the preceding clauses, wherein the first bearing is arranged at a first end of the bevel pinion gear.

[0074] A brush cutter as claimed in any one of the preceding clauses, wherein the second bearing is arranged at a bevel end of the bevel pinion gear.

[0075] A brush cutter as claimed in any one of the preceding clauses, wherein the cavity is in the working head assembly.

[0076] A brush cutter as claimed in any one of the preceding clauses, wherein the cavity is in the shaft.

[0077] A brush cutter according to any one of the items herein, further comprising a tubular spacer disposed between the shaft and the working head assembly.

[0078] A brush cutter as claimed in any one of the preceding clauses, wherein the tubular spacer is arranged at an end of the shaft arranged in the working head assembly.

[0079] A brush cutter as claimed in any one of the preceding clauses, wherein the tubular spacer is fixed to an outer surface of the shaft.

[0080] The brush cutter according to any of the items described herein also includes a clamp assembly fixed to the brush cutter, the clamp assembly including a first base; a second base pivotally connected to the first base, wherein the first base and the second base define an internal cavity for receiving the brush cutter; a ring pivotally connected to the first base; and a stop configured to limit the degree of rotation of the ring relative to the first base.

[0081] A brush cutter as claimed in any one of the preceding clauses, wherein the stop extends from the ring and contacts the first base to limit the extent of rotation of the ring.

[0082] A brush cutter as described in any of the items herein, further comprising a strap releasably securable to the ring.

[0083] A brush cutter according to any of the items described herein, wherein the handle assembly includes a slender rod terminating at an end face; and a grip that at least partially surrounds the slender rod and the end face, wherein the grip includes a protrusion that extends from an inner surface of the grip into the end face of the slender rod to prevent the grip from rotating relative to the slender rod.

[0084] A brush cutter as described in any of the preceding clauses, wherein the protrusion comprises an asymmetrical shape.

[0085] A brush cutter according to any one of the items herein, wherein the handle assembly further comprises a second elongated rod terminating at a second end surface; and a second grip at least partially surrounding the second elongated rod at the second end surface.

[0086] A brush cutter according to any one of the clauses herein, wherein the second handle comprises an actuation member configured to operate the brush cutter.

[0087] A brush cutter as claimed in any one of the preceding clauses, wherein the working implement comprises a disc.

[0088] A brush cutter as described in any one of the preceding claims, wherein the power device comprises an electric motor.

[0089] A brush cutter includes a handle assembly; a working head assembly including a work tool; a shaft extending at least partially between the handle assembly and the working head assembly; a power device operable to actuate the work tool; and a clamp assembly capable of being releasably secured to the brush cutter. The clamp assembly includes a first base; a second base pivotally connected to the first base, wherein the first base and the second base define an internal cavity for receiving the brush cutter; a ring pivotally connected to the first base; and a stop configured to limit a maximum degree of rotation of the ring relative to the first base.

[0090] A brush cutter as claimed in any one of the preceding clauses, wherein the stop extends from the ring and contacts the first base to limit a maximum degree of rotation of the ring.

[0091] A brush cutter as described in any of the items herein, further comprising a strap releasably securable to the ring.

[0092] A brush cutter as described in any of the preceding clauses, wherein the clip assembly is releasably securable to a portion of the handle assembly.

[0093] A brush cutter as claimed in any one of the preceding clauses, wherein the portion of the handle assembly extends in a direction substantially parallel to the axis.

[0094] A brush cutter as claimed in any one of the preceding clauses, wherein the clip assembly is releasably securable to the shaft.

[0095] A brush cutter as claimed in any one of the preceding clauses, wherein the maximum degree of rotation is 15 degrees or less.

[0096] A brush cutter as claimed in any one of the preceding clauses, wherein a fastener releasably secures the first base to the second base.

[0097] A brush cutter as claimed in any one of the clauses herein, wherein when the fastener secures the first base to the second base, a gap exists between the first base and the second base.

[0098] A brush cutter as claimed in any one of the preceding clauses, wherein an overhang extends from at least one of the first base or the second base to at least partially cover the gap.

[0099] A brush cutter includes a handle assembly; and a working head assembly. The working head assembly includes a working tool; and a bevel gear box. The brush cutter also includes a shaft extending at least partially between the handle assembly and the working head assembly, wherein the shaft extends into the bevel gear box; a tubular spacer disposed between the shaft and the bevel gear box; and a power device operable to actuate the working tool.

[0100] A brush cutter according to any one of the items herein, wherein the working head assembly further comprises a small bevel gear arranged in the bevel gear box and capable of being rotated by the power device.

[0101] A brush cutter as claimed in any one of the preceding claims, wherein the bevel gearbox is supported in a cavity of the bevel gearbox by one or more bearings arranged around an outer surface of the bevel pinion gear.

[0102] A brush cutter as claimed in any one of the preceding clauses, wherein the one or more bearings comprise a first bearing and a second bearing separated by a gap.

[0103] A brush cutter as claimed in any one of the preceding claims, wherein the bevel pinion extends from a first end to a bevel end, and wherein the bevel end is functionally coupled to the work implement.

[0104] A brush cutter as claimed in any one of the preceding clauses, wherein the first bearing is arranged at a first end of the bevel pinion gear.

[0105] A handle assembly for a brush cutter includes an elongated rod terminating at an end face; and a grip at least partially surrounding the elongated rod and the end face, wherein the grip includes a protrusion extending from an inner surface of the grip into the end face of the elongated rod to prevent rotation of the grip relative to the elongated rod.

[0106] A handle assembly as described in any of the above, wherein the protrusion comprises an asymmetrical shape.

[0107] A handle assembly as described in any of the above, wherein the elongated shaft includes a hollow interior.

[0108] A handle assembly as described in any of the items herein, wherein the grip includes a plurality of protrusions extending from an inner surface of the grip into an end surface of the elongated shaft.

[0109] A handle assembly as described in any of the above, wherein the grip comprises a contoured grip.

[0110] The handle assembly according to any of the items herein, further comprising a second elongated shaft terminating at a second end surface; and a second grip at least partially surrounding the second elongated shaft at the second end surface.

[0111] A handle assembly as described in any of the preceding clauses, wherein the second grip comprises an actuator configured to operate the brush cutter.

[0112] A handle assembly according to any of the items herein, wherein the second grip comprises a second protrusion extending from an inner surface of the second grip into a second end surface of the second elongated rod to prevent rotation of the second grip relative to the second elongated rod.

[0113] A brush cutter includes a handle assembly including an elongated rod terminating at an end face; and a grip at least partially surrounding the elongated rod and the end face, wherein the grip includes a protrusion extending from an inner surface of the grip into the end face of the elongated rod to prevent rotation of the grip relative to the elongated rod. The brush cutter also includes a working head assembly including a working implement; and a pinion gear extending from a first end to a bevel end, wherein the bevel end is functionally coupled to the working implement, wherein the pinion gear is supported in a cavity by a first bearing and a second bearing arranged around an outer surface of the pinion gear, and wherein the first bearing and the second bearing are separated by a gap. The brush cutter also includes a shaft extending at least partially between the handle assembly and the working head assembly; a power device operable to rotate the pinion gear to actuate the working implement; and a clip assembly capable of being releasably secured to the brush cutter. The clip assembly includes a first base; a second base pivotably connected to the first base, wherein the first base and the second base define an internal cavity for receiving the brush cutter; a ring pivotably connected to the first base; and a stop configured to limit the degree of rotation of the ring relative to the first base.

[0114] A brush cutter according to any one of the items herein, further comprising a tubular spacer disposed between the shaft and the working head assembly.

[0115] The brush cutter according to any one of the items herein, wherein the working head assembly further comprises an output shaft fixed to the working tool; and a bevel gear connected to an exterior of the output shaft and meshing with the bevel pinion gear.

[0116] A brush cutter according to any one of the items herein, wherein the handle assembly further comprises a second elongated rod terminating at a second end surface; and a second grip at least partially surrounding the second elongated rod at the second end surface.

[0117] A brush cutter as claimed in any one of the preceding clauses, wherein the second handle comprises an actuator configured to operate the power device.

[0118] This written description uses examples to disclose the utility model, including the best mode, and also enables any person skilled in the art to practice the utility model, including making and using any device or system and performing any combined method. The patent scope of the utility model is defined by the claims and may include other examples that can be thought of by those skilled in the art. If these other examples include structural elements that are not different from the literal language of the claims, or if these other examples include equivalent structural elements that are not substantially different from the literal language of the claims, then these other examples should be included in the scope of the claims.

Claims

1. A brush cutter, It is characterized in that The brush cutter comprises: Handle assembly; A working head assembly, the working head assembly comprising: work equipment; and A small bevel gear extending from the first end to the bevel end, wherein the bevel end is functionally coupled to the working tool, wherein the small bevel gear is supported in the cavity by a first bearing and a second bearing arranged around the outer surface of the small bevel gear, and wherein the first bearing and the second bearing are separated by a gap; a shaft extending at least partially between the handle assembly and the working head assembly; and A power device operable to rotate the bevel pinion to actuate the work tool.

2. The brush cutter according to claim 1, It is characterized in that The working head assembly also includes: an output shaft fixed to the work tool; and A bevel gear is connected to the outside of the output shaft and meshes with the bevel pinion gear.

3. The brush cutter according to claim 1, It is characterized in that The bevel pinion extends in a direction parallel to the shaft.

4. The brush cutter according to claim 1, It is characterized in that The first bearing is arranged at a first end of the bevel pinion gear.

5. The brush cutter according to claim 4, It is characterized in that The second bearing is arranged at the bevel end of the bevel pinion gear.

6. The brush cutter according to claim 1, It is characterized in that The brush cutter also includes a tubular spacer disposed between the shaft and the working head assembly.

7. The brush cutter according to claim 6, It is characterized in that The tubular spacer is disposed at an end of the shaft disposed in the working head assembly.

8. The brush cutter according to claim 6, It is characterized in that The tubular spacer is secured to an outer surface of the shaft.

9. The brush cutter according to claim 1, It is characterized in that The brush cutter also includes a clip assembly fixed to the brush cutter, the clip assembly including: first base; a second base pivotably connected to the first base, wherein the first base and the second base define an interior cavity for receiving the brush cutter; a ring pivotably connected to the first base; and A stop is configured to limit the extent of rotation of the ring relative to the first base.

10. The brush cutter according to claim 9, It is characterized in that The stopper extends from the ring and contacts the first base to limit the degree of rotation of the ring.

11. The brush cutter according to claim 9, It is characterized in that The brush cutter also includes a strap releasably securable to the ring.

12. The brush cutter according to claim 1, It is characterized in that The handle assembly comprises: an elongated rod terminating at an end face; and a handle at least partially surrounding the elongated shaft and the end surface, Wherein, the handle comprises a protrusion, which extends from the inner surface of the handle into the end surface of the slender rod to prevent the handle from rotating relative to the slender rod.

13. The brush cutter according to claim 12, It is characterized in that The protrusion comprises an asymmetrical shape.

14. The brush cutter according to claim 12, It is characterized in that The handle assembly also includes: a second elongated rod terminating at a second end surface; and A second handle at least partially surrounds the second elongated shaft at the second end surface.

15. The brush cutter according to claim 14, It is characterized in that The second handle includes an actuation member configured to operate the brush cutter.

16. A brush cutter, It is characterized in that The brush cutter comprises: A handle assembly, the handle assembly comprising: an elongated rod terminating at an end face; and a grip at least partially surrounding the elongated shaft and the end surface, wherein the grip includes a protrusion extending from an inner surface of the grip into the end surface of the elongated shaft to prevent rotation of the grip relative to the elongated shaft; A working head assembly, the working head assembly comprising: work equipment; and A small bevel gear extending from the first end to the bevel end, wherein the bevel end is functionally coupled to the working tool, wherein the small bevel gear is supported in the cavity by a first bearing and a second bearing arranged around the outer surface of the small bevel gear, and wherein the first bearing and the second bearing are separated by a gap; a shaft extending at least partially between the handle assembly and the working head assembly; a power device operable to rotate the bevel pinion to actuate the work tool; and A clip assembly releasably securable to the brush cutter, the clip assembly comprising: first base; a second base pivotably connected to the first base, wherein the first base and the second base define an interior cavity for receiving the brush cutter; a ring pivotably connected to said first base; and A stop is configured to limit the extent of rotation of the ring relative to the first base.

17. The brush cutter according to claim 16, It is characterized in that The brush cutter also includes a tubular spacer disposed between the shaft and the working head assembly.

18. The brush cutter according to claim 17, It is characterized in that The working head assembly also includes: an output shaft fixed to the work tool; and A bevel gear is connected to the outside of the output shaft and meshes with the bevel pinion gear.

19. The brush cutter according to claim 16, It is characterized in that The brush cutter also includes: a second elongated rod terminating at a second end surface; and A second handle at least partially surrounds the second elongated shaft at the second end surface.

20. The brush cutter according to claim 19, It is characterized in that The second handle includes an actuator configured to operate the power device.

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