Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
  • B27B—SAWS FOR WOOD OR SIMILAR MATERIAL; COMPONENTS OR ACCESSORIES THEREFOR
  • B27B17/00—Chain saws; Equipment therefor
  • B27B17/0008—Means for carrying the chain saw, e.g. handles

Definitions

• Example embodiments generally relate to an outdoor power device that is electrically powered and, more particularly, relate to a cutting device that can be pivoted between two cutting orientations.
• Handheld outdoor power devices such as trimmers, blowers, chainsaws, and/or the like, are often used to perform tasks relating to yard/grounds maintenance or even commercial resource harvesting activities that require them to be mobile. Such devices often have a working implement adjacent to, or extending from, a battery powered electric motor.
• the one or more handles are ergonomically positioned to ensure safe and comfortable handling of the device. In this regard, the handles must be designed and positioned to ensure optimal tool balance, control, and safe operation.
• the handle arrangement on a polesaw may be designed to optimize operator ergonomics when cutting in a vertical cutting direction, but it may be desirable to make a cut in the horizontal direction. In order to make such a cut, the operator may need to position the handles awkwardly, thus reducing operator comfort, decreasing leverage and control, and risking fatigue or injury.
• Some example embodiments may therefore provide a cutting device that can provide more than one ergonomic mode of operation by allowing a working assembly of the device to be rotated about an elongated member.
• an orientation adjustment assembly may operably couple a working assembly to an elongated member such that the working assembly may be rotated with respect to the elongated member.
• different cutting orientations of the working assembly may be achieved.
• the working assembly may be oriented vertically for a pruning method of operation, while the working assembly may be oriented horizontally for a clear cutting method of operation.
• some embodiments may provide for an outdoor power device that has more than one ergonomic mode of operation.
• a hand-held cutting device may include a working assembly, a power assembly, an elongated member, a control assembly, and an orientation adjustment assembly.
• the working assembly may include an electric motor and may be positionable in a first orientation or a second orientation.
• the power assembly may include an electric power source, and an elongated member may extend between the working assembly and power assembly.
• the control assembly may be configured for selectively providing power from the power assembly to the working assembly via the electric motor.
• the orientation adjustment assembly may by disposed at a portion of the elongated member and may comprise a locked state in which the working assembly is fixed in the first orientation or the second orientation, and an unlocked state in which the working assembly in rotatable about a longitudinal axis defined by the elongated member between the first orientation and the second orientation.
• FIG. 1 illustrates a functional block diagram of a device configured in accordance with an example embodiment
• FIG. 2 illustrates a perspective view of a battery powered polesaw in a first orientation, i.e., a pruning orientation, that may be configured in accordance with an example embodiment
• FIG. 3 illustrates a perspective view of a battery powered polesaw in a second orientation, i.e., a clear cutting orientation, that may be configured in accordance with an example embodiment
• FIG. 4 illustrates a close-up perspective view of a work assembly of the polesaw in a first orientation according to an example embodiment
• FIG. 5 illustrates a close-up perspective view of a partially disassembled work assembly of the polesaw according to an example embodiment
• FIG. 6 illustrates a close-up perspective view of a partially disassembled work assembly of the polesaw according to an example embodiment
• FIG. 7 illustrates a close-up perspective view of a work assembly of the polesaw according to an example embodiment, wherein the working assembly is in an unlocked state and is transitioning between a first and second orientation.
• the term "operating position" refers to the default ergonomic orientation of the device when held for operation. In an example embodiment, this orientation may be defined in relation to a reference plane and the ground. In this regard, the left and right half portions of the housing of the power assembly may combine to form a seam that defines a reference plane. When the device is in the operating position, that reference plane is perpendicular to the ground.
• the operating position may be defined using other reference planes, depending on the construction of the particular device. In the operating position, the working assembly represents the front of such devices. All other directional references should be understood in this general context.
• the power assembly is located at the rear of the device, the bottom of the device faces the ground, and the top of the device faces upwards toward the operator or away from the ground.
• Some example embodiments described herein provide a dual orientation cutting device.
• some embodiments may employ a work assembly (e.g., a cutting head) that can pivot 90° about the pole on which it is mounted, without changing the positioning of the handles.
• a device may provide multiple ergonomic modes of operation.
• the device may be a polesaw with a cutting head that remains in an upright orientation for a pruning mode of operation, but which may be pivoted such that the cutting blade lies in a horizontal orientation for a clear cutting mode of operation.
• the work assembly e.g., cutting head
• example embodiments provide for a cutting device that provides multiple ergonomic modes of operation.
• FIG. 1 shows a functional block diagram of a device configured in accordance with an example embodiment.
• the device may include a working implement or working assembly 10 that is operably coupled to a power assembly 12.
• the power assembly 12 may have an elongated member, such as a pole 14 extending therefrom, which is operably connected to the working assembly through an orientation adjustment assembly 16.
• the power assembly 12 may further comprise an electric power source, such as a battery pack, for powering an electric motor, which may be a part of the working assembly 10.
• the battery pack may be electrically connected to the electric motor by electrical wires which are passed from the power assembly 12 through the center of the hollow pole 14 to the working assembly 10.
• a control assembly 18 controls the amount of electric power delivered from the power assembly 12 to the working assembly 10.
• the power assembly 12 may include a power source that requires a corded connection (e.g., a corded connection to mains power).
• the orientation adjustment assembly 16 provides a means for connecting the pole 14 extending from the power assembly 12 with the working assembly 10, such that the working assembly 10 may pivot relative to the pole 14 to provide multiple ergonomic modes of operation. As depicted in the figures, the orientation adjustment assembly 16 is disposed proximate to the working assembly 10. However, the orientation adjustment assembly 16 may be disposed anywhere along the pole 14 between the working assembly 10 and the front handle. For example, the working assembly 10 may optionally comprise an extension arm or pole that extends from the working assembly 10 to couple with the orientation adjustment assembly 16.
• FIGS. 2 and 3 show an electrically powered polesaw 20 that may be configured in accordance with an example embodiment.
• the polesaw 20 is merely one example of an electrically powered, outdoor power device that may be configured in accordance with an example embodiment.
• some embodiments may be practiced in connection with other outdoor power devices such as edgers, brush cutters, and/or the like.
• the polesaw 20 of FIGS. 2 and 3 is a battery powered device.
• example embodiments could alternatively be employed in connection with corded versions of various electrically powered, outdoor power devices.
• example embodiments could also be practiced in connection with combustion engines that are configured to enable conversion of the direction that the output shaft turns.
• combustion engines that are configured to enable conversion of the direction that the output shaft turns.
• the polesaw 20 may include a working implement or working assembly 10, which in this example includes a rotatable cutting blade assembly 22.
• the working assembly 10 may further include a motor, such as electric motor 24 disposed in a housing 26 of the working assembly 10.
• the motor 24 may be used to power a cutting chain (not shown) which is disposed on the guide bar 28 for the effective cutting of any branches or vegetation.
• the motor 24 turns a drive shaft (i.e., a motor shaft) and a sprocket drive wheel (not shown).
• the cutting chain is operably coupled to the sprocket drive wheel and is supported in a peripheral groove which extends around the guide bar 28.
• the guide bar 28 is attached to the housing 26 by a tensioning and clamping assembly (not shown) provided at the proximal end of the guide bar 28.
• the motor 24 of the polesaw 20 may be powered, according to this example, by a battery pack 30.
• the battery pack 30 is received in a battery compartment of the polesaw 20.
• the battery compartment may be a recess or cavity formed in a casing 32 of the power assembly 12.
• the battery compartment can be located in the top, bottom, or sides of the casing 32 and may penetrate only one side of the casing 32.
• the battery compartment may include a through-hole that passes entirely through the casing 32 so that the battery compartment includes openings on opposing sides of the casing 32.
• the casing 32 may substantially enclose the battery compartment, control circuitry, and/or other components associated with powering and/or controlling the operation of the polesaw 20.
• the casing 32 may be formed from one or more plastic or other rigid components that may be molded to have a desired shape.
• the casing 32 may be composed of a right half portion and a left half portion that may form a majority of the casing 32.
• a seam 34 may extend along a longitudinal centerline of the casing 32 to divide the casing 32 along the right half and left half portions. As discussed above, this seam 34 may define a reference plane that is perpendicular to the ground when the polesaw 20 is in the operating position.
• an elongated member such as pole 14 operably couples the working assembly 10 to the power assembly 12, which are disposed at opposite ends of the pole 14.
• the elongated member may be a hollow tube, pipe, rod, or other such member that may be straight or curved in different embodiments.
• the elongated member may also provide operable communication between the working assembly 10 and the battery pack 30 such that the battery pack 30 can power the working assembly 10.
• wires (indicated by dotted line 36 in Fig. 2) extend from the battery pack 30 through the pole 14 to the working assembly 10 to provide power to the motor 24.
• the battery pack of some alternative embodiments may be housed within a backpack that may be worn on the operator's back. In such an example, the battery pack may be connected to the polesaw 20 via a cord or other adaptor.
• the polesaw 20 may include a rear handle 40 and a front handle 42.
• the rear handle 40 may be disposed in-line with the pole 14 proximate to the casing 32, while the front handle 42 may be disposed between the casing 32 and the working assembly 10 along the pole 14.
• An operator of the polesaw 20 may use one hand to hold the front handle 42 and the other hand to hold the rear handle 40 while operating the polesaw 20.
• the rear handle 40 may include a trigger 44 or other control mechanism for engaging operation of the motor 24 to power the working assembly 10.
• FIG. 2 shows the front handle 42 being positioned forward of the rear handle 40 along the pole 14, it should also be appreciated that other arrangements for holding and operating the polesaw 20 may be provided.
• a "handlebar" embodiment may be provided in which the front and rear handles 42/40 are replaced by a single handle assembly attached to the pole 14, where both handles on the handle assembly are substantially equidistant from the working assembly 10 and disposed spaced apart from the pole 14 on opposites sides thereof on a handlebar assembly.
• the front handle 42 may be fully adjustable, and may be rotated about the pole 14 or moved axially with respect to the pole. After being adjusted to the desired position and orientation, the front handle 42 may be fixed by a screw clamp, set screw, or any other suitable securing means. Other arrangements are also possible.
• the motor 24 may be a DC motor or a brushless DC motor (BLDC) that is powered by the battery pack 30.
• the power assembly 12 and battery pack 30 may be controlled by the trigger 44 and/or the control panel 46.
• the trigger 44 and control panel 46 are positioned on the casing 32 of the power assembly 12 proximate to the rear handle 40.
• the trigger 44 and control panel 46 could be positioned at any of a number of other locations on the polesaw 20 in alternative embodiments, such as on front handle 42.
• the control panel 46 may be configured to control numerous aspects of the operation of the polesaw 20. For example, the control panel 46 may monitor motor speed, set speed limits, apply cruise control, etc.
• the orientation adjustment assembly 16 enables the working assembly 10 to be rotated with respect to the pole 14 and power assembly 12.
• the blade assembly 22 is oriented such that the guide bar 28 is extended in a longitudinal direction with respect to the pole 14 and is vertically oriented with respect to the ground.
• the guide bar 28 lies in a plane parallel to the reference plane in which seam 34 separates the right half and left half portions of the casing 32.
• This position is referred to herein as the first orientation, and is often known in the art as a pruning orientation.
• FIG 3 shows the blade assembly 22 in a second orientation, known in the art as a clear cutting orientation, where the guide bar 28 remains longitudinally extended with respect to the pole 14, but is rotated 90° about an axis defined by pole 14, such that it is parallel to the ground.
• the guide bar 28 in the second orientation, lies in a plane that is perpendicular to the reference plane in which seam 34 separates the right half and left half portions of the casing 32.
• FIG. 4 illustrates an example of the working assembly 10 of an example embodiment to more clearly illustrate some of the features of the working assembly 10.
• the working assembly 10 may include a housing 26, which may be partially open, such that the sides of the motor 24 are exposed for improved cooling.
• the housing of the motor 24 may comprise a plurality of radially extending fins to improve cooling efficiency.
• the housing 26 further comprises a chain oil reservoir 48 (see FIG. 3) for lubricating the cutting chain.
• the oil reservoir 48 is disposed below the cutting blade 28 when the working assembly 10 is in the clear cutting orientation.
• An oil reservoir cap 50 is provided for filling the oil reservoir 48 with lubricating oil.
• FIG. 5 illustrates a close-up perspective view of a partially disassembled work assembly 10 of the polesaw 20 according to an example embodiment.
• the orientation adjustment assembly 16 comprises a receiving neck 54 which may be connected to, or may be a unitary portion of, the housing 26. Alternatively, the receiving neck 54 may be disposed at any point along the pole 14. In some cases, the receiving neck 54 may be configured to enable the housing 26 to be turned in either the first orientation or the second orientation relative to the pole 14 without removing the housing 26 from the pole 14.
• wires 36 are fed from the control assembly, through the pole 14, and through the receiving neck 54 to deliver power to the electric motor 24.
• the receiving neck 54 is configured to receive pole 14, which is inserted therein.
• a protruding member such as a set screw 66 is inserted through a receiving port 68 in the side of the receiving neck 54.
• the distal end of the set screw 66 protrudes through the receiving neck 54 and engages slot 70 of the pole 14, such that it prevents movement of the working assembly 10 with respect to the longitudinal axis of pole 14, but allows rotation within a limited angular range of motion. This is referred to herein as the unlocked state of the orientation adjustment assembly 16.
• the protruding member described above is a set screw 66, one skilled in the art will appreciate that any other member sufficient to restrict the relative motion of the pole 14 and working assembly 10 may also be used.
• the protruding member may alternatively be a detent, such as a spring-loaded ball, a rigid pin, or the like.
• the protruding member may be located proximate to, or some distance from, the collar, or may even extend through the collar.
• slot 70 extends circumferentially around the end of the pole 14, in a direction perpendicular to the longitudinal axis of the pole 14, over a range of around 90°. By limiting the rotation angle of the housing 26, the twisting and wear of wires 36 may be reduced.
• this angle of rotation is not meant to be limiting, and other angles of rotation are contemplated and within the scope of the invention. Although the example shown restricts motion to about 90°, it should be appreciated that any angle less than 330° may be effective in preventing damage to the wires 36.
• any other means suitable for fixing the working assembly 10 with respect to the pole 14 may be used and remain within the scope of the present invention.
• another set screw can be inserted through holes drilled in the adjustable collar 74, receiving neck 54, and/or pole 14 to secure the working assembly 10 in its final position relative to the pole 14.
• assembly of a cutting device in accordance with an example embodiment comprises feeding wires 36 through the receiving neck 54 and connecting the wires to the electric motor 24.
• the end of pole 14 is then inserted into the receiving neck 54 such that the set screw 66 may be aligned with slot 70.
• set screw 66 may be inserted into the receiving port 68 on the receiving neck 54.
• the orientation adjustment assembly 16 is in the unlocked state, such that the working assembly 10 is fixed with respect to the longitudinal axis of pole 14, but may rotate within a limited angular range of motion, defined in part by the slot 70, between a first and second orientation.
• the adjustable collar 74 may be tightened to place the orientation adjustment assembly 16 in the locked state. In the locked state, the working assembly 10 may not rotate relative to the pole 14, and the working assembly 10 is ready for operation.
• a hand-held cutting device e.g., a polesaw
• the device may include a working assembly, a power assembly, an elongated member, a control assembly, and an orientation adjustment assembly.
• the working assembly may include an electric motor and may be positionable in a first orientation or a second orientation.
• the power assembly may include an electric power source, and an elongated member may extend between the working assembly and power assembly.
• the control assembly may be configured for selectively providing power from the power assembly to the working assembly via the electric motor.
• the orientation adjustment assembly may by disposed at a portion of the elongated member and may comprise a locked state in which the working assembly is fixed in the first orientation or the second orientation, and an unlocked state in which the working assembly in rotatable about a longitudinal axis defined by the elongated member between the first orientation and the second orientation.
• the first orientation and the second orientation are about 90° apart.
• the device of some embodiments may include additional features that may be optionally added.
• a front and rear handle may be added, the front handle being disposed along the elongated member and the rear handle being disposed on the casing of the power assembly.
• the orientation adjustment assembly may be disposed along the elongated member between the front handle and the working assembly.
• the orientation adjustment assembly may include a receiving neck for receiving a portion of the elongated member, and that receiving neck may be disposed proximate to a housing of the working assembly.
• the orientation adjustment assembly may include a protruding member for preventing movement of the working assembly along the longitudinal axis of elongated member and limiting the angular range of motion of the working assembly relative to the elongated member in both the locked and unlocked states.
• the orientation adjustment assembly may include a clamping member for preventing rotation of the working assembly with respect to the elongated member. That clamping member may include, for example, an adjustable collar and a tightening element to effect a clamping pressure and secure the working assembly to the elongated member and put the orientation adjustment assembly in the locked state.
• the protruding member may be disposed proximate to the adjustable collar.
• the orientation adjustment assembly may include a slot that is disposed on the elongated member and extends about 90° about the circumference of the elongated member. This slot may be configured to limit the angular range of motion of the working assembly.
• the protruding member is a set screw which engages the slot in the elongated member. In other embodiments the protruding member is a spring- loaded steel ball.
• the working assembly may include a guide bar with a cutting chain disposed thereon, and the cutting chain may be operably coupled to the electric motor.
• the guide bar when the working assembly is in a first orientation, which may correspond to a pruning orientation, the guide bar is longitudinally extended with respect to the elongated member, and lies in a plane parallel to a reference plane that is perpendicular to the ground.
• the working assembly when the working assembly is in the second orientation, which may correspond to a clear cutting orientation, the guide bar is longitudinally extended with respect to the elongated member and lies in a plane parallel to the ground.
• the device may also include a chain oil reservoir for lubricating the cutting chain that may be supported in a peripheral groove which extends around the guide bar, wherein the chain oil reservoir is disposed below the guide bar when the working assembly is in the second orientation.
• the housing of the working assembly may be partially open, such that portions of the electric motor are exposed to aid in cooling the electric motor.
• the interior of the elongated member is hollow and wires that connect the electric power source to the electric motor are fed through the inside of the elongated member to the electric motor.

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• Life Sciences & Earth Sciences (AREA)
• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Wood Science & Technology (AREA)
• Forests & Forestry (AREA)
• Harvester Elements (AREA)

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• 2015
  • 2015-03-26 WO PCT/EP2015/056597 patent/WO2016150515A1/en active Application Filing
  • 2015-03-26 EP EP15716448.4A patent/EP3274142A1/de active Pending

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