JP5977386B2 - Battery powered power tools - Google Patents

Description

  The present invention relates to a power tool. In particular, the present invention relates to battery powered power tools.

  Battery-operated manually operated power tools such as, but not limited to, chainsaws, line trimmers, and hedge trimmers are known in the art. Generally, the battery is detachably attached to the power tool and provides electrical energy to the electric motor. The manually operated power tool may have a front handle and a rear handle for gripping and operating the power tool. Drive motors and batteries tend to have significant weight to provide sufficient power and duration for various operations, thereby increasing the overall weight of the power tool. Even if the overall weight is increased, the placement of the center of gravity of the battery and drive motor in the power tool is critical to provide the user with ease of gripping and a stable balance during operation.

  In general, the battery arrangement is movable, while the drive motor arrangement can be fixed relative to other components. Improper placement of the battery's center of gravity makes the power tool unbalanced and increases user fatigue during operation.

  In general, technically, the battery and motor arrangements cause the front handle to be configured above the overall center of gravity of the power tool. However, such an arrangement of the total center of gravity cannot provide a sufficient balance of hedge trimmers during operation.

  In view of the foregoing, there is a need for a battery-powered manually operated power tool that can provide better operability and balance during operation of the power tool.

  In view of the above points, an object of the present invention is to solve or reduce the above-mentioned problems. In particular, it is an object of the present invention to provide a battery-operated power tool that provides good operability and balance during operation.

  The object of the invention is achieved at least in part by a novel power tool as claimed in claim 1. The power tool is connected to the tool body, one or more operating devices coupled to the tool body, an electric motor connected to the one or more operating devices in a drivable manner, and an electric motor for supplying electrical energy A battery. The tool body has a front handle and a rear handle such that the front handle is at least partially disposed at the front of the rear handle along the longitudinal axis. Further, the entire center of gravity of the power tool is disposed in the vicinity of the rear handle in the vertical direction. In the aspect according to the present invention, the vicinity of the entire center of gravity toward the rear handle in the vertical direction can improve the operability and balance of the electric tool being operated.

Bas Tteri is disposed in the vicinity of the rear handle in the vertical direction. In the absence of a battery, the overall center of gravity of the power tool can be located near the drive motor. Such an arrangement of the center of gravity of the battery can move the entire center of gravity of the power tool toward the rear handle in the vertical direction.

The center of gravity of the bar Tteri is disposed on the central plane of rear handle in a substantially lateral direction. Furthermore, a battery includes a central plane of the rear handle in a substantially lateral direction. Incidentally, a battery is arranged on the side of the center plane of the rear wheel in a substantially lateral direction. The three optional configurations of the battery with respect to the central plane of the rear handle can improve the balance of the power tool in a generally lateral direction.

Bas Tteri is at least partially disposed in the rear part of rear handle along the longitudinal axis. Incidentally, a battery is at least partially disposed in front of the rear handle along the longitudinal axis.

Bas Tteri is at least partially disposed in the rear of the electric motor along the longitudinal axis.

Bas Tteri is detachably mounted from the substantially left in the tool body.

Bas Tteri is removably mounted from a substantially right to the tool body.

Bas Tteri is detachably mounted from substantially above the tool body.

Bas Tteri is detachably mounted from substantially downward to the tool body.

Bas Tteri is detachably mounted from substantially behind the tool body.

Bas Tteriseru is motor shaft substantially parallel.

Electrostatic dynamic tool, one chain saw, a hedge trimmer or line trimmers.

  The present invention will be described in more detail with reference to the drawings disclosed below.

The side view of the electric tool by embodiment which concerns on this invention is shown. The rear view of the electric tool by embodiment which concerns on this invention is shown. The rear view of the electric tool by embodiment concerning this invention provided with the battery attached to the electric tool from the left so that attachment or detachment is possible is shown. The rear view of the electric tool by embodiment concerning this invention provided with the battery attached to the electric tool from the right so that attachment or detachment is possible is shown. The side view of the electric tool by embodiment concerning this invention provided with the battery attached to the electric tool so that attachment or detachment from upper direction is possible is shown. The side view of the electric tool by embodiment concerning this invention provided with the battery attached to the electric tool so that attachment or detachment is possible from the downward direction is shown. The side view of the electric tool by embodiment concerning this invention provided with the battery attached to the electric tool so that attachment or detachment is possible from back is shown. FIG. 6 shows a side view of a power tool according to another embodiment of the invention with a rear handle configuration.

  The present invention will be described more fully hereinafter with reference to the accompanying drawings, in which exemplary embodiments according to the invention including one or more aspects are shown. However, the present invention can be incorporated in many different forms and should not be construed as limited to the embodiments described herein, but rather these embodiments are intended to exhaust this disclosure thoroughly and sufficiently. And is provided to fully convey the scope of the invention to those skilled in the art. For example, one or more aspects of the present invention may be implemented in other embodiments and even in other types of devices. In the figures, like reference numerals refer to like elements.

  1A and 1B show an exemplary chainsaw 100 according to the present invention. Chain saw 100 (hereinafter referred to as power tool 100) may be used in gardening or forestry applications. Without departing from the elements according to the present invention, any other battery-powered with two handles, such as but not limited to a line trimmer, hedge trimmer, rotary saw or other cutting or pruning tool. It will be apparent to those skilled in the art that the present invention can be used in manually operated devices. In addition, any suitable size, shape, or element type or material type may be used.

  1A and 1B further illustrate a coordinate system for the power tool 100. FIG. The X axis is substantially parallel to the longitudinal axis L of the power tool 100. As shown in FIG. 1A, the Y axis is substantially orthogonal to the longitudinal axis L of the power tool 100.

  Further, as used herein, the terms “longitudinal direction”, “lateral direction” and “vertical direction” indicate directions relative to the power tool 100. The term longitudinal direction indicates a direction substantially parallel to the longitudinal axis, i.e., the X-axis, unless otherwise specified. The terms “vertical direction” and “lateral direction” refer to directions substantially parallel to the Y axis and the Z axis, respectively, unless otherwise specified. The terms “front” and “rear” with respect to a portion or part of the power tool 100 generally refer to “front” in the operating position of the power tool 100, which may indicate a part or part of the side along the longitudinal direction. "Is farther from the user than" rear ". The terms “upper” and “lower” can generally refer to the sides of the power tool 100 substantially along the Y axis, where “upper” and “lower” are the upper and lower positions, respectively, in the operating position of the power tool 100. At the bottom. The terms “left” and “right” may respectively indicate “left side” and “right side” of the power tool 100 along the Z axis from the user's viewpoint at the operation position of the power tool 100. The term “oblique” may refer to any non-perpendicular direction or non-perpendicular arrangement.

  In the embodiment according to the present invention, the electric power tool 100 may include a tool main body 102 and one or a plurality of operation devices (not shown) coupled to the tool main body 102. In the embodiment according to the present invention, the operating device may have an occluded chain supported by a guide bar. The guide bar may be attached to the tool body 102 via one or a plurality of fastening portions. Further, the drive sprocket and the idle sprocket may be at the proximal and distal ends of the guide bar, respectively, relative to the tool body 102.

  In the embodiment according to the present invention, the tool body 102 may have a front handle 104 and a rear handle 106. In an embodiment according to the present invention, the front handle 104 may be at least partially disposed at the front of the rear handle 106 along the longitudinal axis L. In various embodiments according to the present invention, at least one front handle 104 or rear handle 106 may include vibration absorbing means such as, but not limited to, a spring, a rubber member, and the like. Further, the front handle 104 and / or the rear handle 106 may have rib portions (not shown) to make the power tool 100 easier to grip. In embodiments according to the present invention, the guard 108 may be shown for a user safety device during a cutting operation. Further, the tool body 102 may have a cover for the safety and smooth function of the movable part.

  In the embodiment according to the present invention, the electric motor 110 may be drivably coupled to the drive sprocket. The electric motor 110 is coupled to the drive sprocket via suitable transmission means (not shown) such as, but not limited to, one or more gears, belt drive, friction drive, or any combination thereof. There may be obtained motor shaft 112. The transmission means may be used to selectively drive the drive sprocket at one or more speeds. The electric motor 110 is not limited, and may be a motor that uses electricity as a power source, such as an AC motor and a DC motor. In the embodiment according to the present invention, the speed and torque of the electric motor 110 may be changed continuously or discretely by suitable control means. The control means may comprise one or more sensors for detecting various parameters of the electric motor such as speed, torque, etc. The sensed parameter may then be used to control the speed and / or torque of the electric motor 110. As shown in FIG. 1B, the electric motor 110 may be disposed on the left side of the tool body 102. However, other arrangements of the electric motor 110 relative to the tool body 102 are possible without departing from the form of the scope according to the present invention.

  In an embodiment according to the present invention, at least one battery 114 may be provided in the tool body 102 to selectively supply electrical energy to the electric motor 110. In the embodiment according to the present invention, the battery 114 may be detachably attached to the tool body 102. The rated power and other specifications of the electric motor 110 and battery 114 are selected based on various parameters such as, but not limited to, required power, duration of use, estimated life, cost, weight, dimensions, etc. Also good.

Further, as shown in FIG. 1, the battery 114 may be at least partially disposed behind the rear handle 106 along the longitudinal axis L. This configuration of the power tool 100 may be generally referred to as an “upper handle” configuration. Alternative configurations (shown in detail in conjunction with FIG. 7), such as a “rear handle” configuration, in which the battery 114 may be at least partially disposed in the front of the rear handle 106, are within the scope of the present invention Is possible. As shown in FIG. 1, the center of gravity 116 of the battery 114 may be arranged at a distance D1 from the rear handle axis R and at a distance D2 in a substantially vertical direction from the horizontal axis N intersecting the electric motor axis M. Good. The rear handle axis R and the electric motor axis M may be arranged symmetrically with respect to the rear handle 106 and the electric motor 110 in a substantially vertical direction, respectively. In the embodiment according to the present invention, the center of gravity 116 of the battery 114 may be arranged in the vicinity of the rear handle 106 in the vertical direction. When the battery 114 is not provided, the entire center of gravity of the electric power tool 100 can be disposed near the electric motor 110. However, the arrangement of the center of gravity 116 of the battery 114 described in the present invention can move the entire center of gravity of the power tool 100 to the rear handle 106 in the vertical direction, and balances the operability during operation and the power tool 100. Can be improved.

  In further embodiments according to the present invention, D1 can be minimized by changing various parameters. The various parameters include, but are not limited to, the placement of the battery 114 in the tool body 102 relative to other components (eg, D2), the shape, dimensions, configuration, and / or overall weight of the battery 114, the electric motor 110 You may have arrangement, weight, and / or dimensions.

  Further, as shown in FIG. 1B, the center of gravity 116 of the battery 114 may be disposed on the central plane P of the rear handle 106 in a substantially lateral direction substantially parallel to the Z axis. The central plane P may be arranged symmetrically with respect to the rear handle 106 in a substantially lateral direction. However, in various other embodiments according to the present invention, the battery 114 may include a central plane P of the rear handle 106 in a generally lateral direction. In still another embodiment according to the present invention, the battery 114 may be disposed on the side (left or right) of the center plane P of the rear handle 106 in a substantially lateral direction. Similar to D1, the distance between the center of gravity 116 and the central plane P can be minimized by changing various parameters.

  FIG. 2 shows a cross-sectional view of the battery 114 in a separated state according to an embodiment of the present invention. The battery 114 may have a battery housing 202 that covers one or more batteries 204. Although the batteries 204 in the exemplary embodiment have been shown to be stacked substantially parallel to one another in multiple rows, other configurations (eg, alternating) are envisioned without departing from the scope of the present invention. The In various embodiments according to the present invention, one or more batteries 204 may also be disposed adjacent to the other in the lateral direction of the power tool 100. In the embodiment according to the present invention, the battery 204 may be arranged substantially parallel to the motor shaft 112. However, in other embodiments according to the present invention, the battery 204 may be arranged obliquely with respect to the motor shaft 112. The one or more batteries 204 may be rechargeable lithium ion batteries. The internal surface of the battery housing 202 may have a conductor that is electrically connected to the electrodes of one or more battery cells 204 for one or more electrical contacts (not shown). In embodiments according to the present invention, the one or more electrical contacts may be electrically joined with one or more associated electrical contacts provided to the tool body 102 to form an electrical connection. The battery 114 may have at least one mechanical joining surface (not shown) to mechanically connect the battery 114 with the tool body 102 of the power tool 100. The mechanical bonding surface may comprise a suitable releasable mechanical connection such as, but not limited to, a snap fit connection, a recessed connection and groove, a connection with an elastic member (eg, a spring) or any combination thereof. You may have. The mechanical coupling may be selectively restrained or released without tools. In other embodiments according to the present invention, the mechanical coupling may require one or more tools to disassemble the battery 114 from the tool body 102 of the power tool 100.

  Further, as shown in FIGS. 2 to 3, the battery 114 may be detachably attached to the tool body 102 from various directions. For example, as indicated by the arrow 200 in FIG. 2, the battery 114 may be detachably attached to the tool body 102 from substantially the left. Obviously, the battery 114 may be separated in the mounting direction. In another embodiment according to the present invention indicated by the arrow 300 in FIG. 3, the battery 114 may be detachably attached to the tool body 102 from approximately the right. As shown by the arrow 400 in FIG. 4, in another embodiment according to the present invention, the battery 114 may be detachably attached to the tool body 102 from substantially above. In yet another embodiment according to the present invention, as shown by the arrow 500 in FIG. 5, the battery 114 may be detachably attached to the tool body 102 from substantially below. In another embodiment according to the present invention, as shown by the arrow 600 in FIG. 6, the battery 114 may be detachably attached to the tool body 102 from substantially the rear. The plurality of directions shown in FIGS. 2 through 6 are for illustration only, and the battery 114 may have any arbitrary orientation, such as a generally diagonal direction, without departing from the scope of the present invention. It will be apparent to those skilled in the art that the tool body 102 may be detachably attached from other directions.

  FIG. 7 shows a chainsaw 700 with a rear handle configuration. The chainsaw 700 may have a tool body 702 and one or more operating devices (not shown). The tool body 702 may have a front handle 704, a rear handle 706 and a guard 708. The electric motor 710 may be drivably connected to the operating device. The battery 712 may provide electrical energy for driving the drive motor 710. As shown in FIG. 7, the battery 712 may be at least partially disposed at the front of the rear handle 706. Further, the center of gravity 714 of the battery 712 may be disposed at a distance D1 'from the rear handle axis R' and a distance D2 'from the motor axis M' in a substantially vertical direction. The rear handle axis R ′ and the motor axis M ′ may be arranged symmetrically with respect to the rear handle 706 and the electric motor 710 in the substantially vertical direction, respectively. In an embodiment according to the present invention, D1 'may be such that the center of gravity 714 of the battery 712 is located near the rear handle 706 in the vertical direction. In further embodiments according to the invention, D1 'may be minimized by changing various parameters.

  Although preferred embodiments and examples according to the present invention have been disclosed and specific terms have been used in the drawings and specification, they are used in a general and descriptive sense only and are intended to be limiting. Rather, the scope of the invention is set forth in the following claims.

Claims (10)

An electric chainsaw (100),
A tool body (102);
One or more operating devices connected to the tool body (102);
An electric motor (110) drivably connected to the one or more operating devices;
At least one battery (114) for supplying electrical energy to the electric motor (110) having at least one battery cell (204);
A front handle (104) and a rear handle (106), wherein the front handle (104) is at least partially disposed at the front of the rear handle (106) along the longitudinal axis (L). In a chainsaw (100) comprising a front handle (104) and a rear handle (106),
The battery (114) is detachably attached to the tool body (102),
When the battery (114) is attached to the tool body (102), the center of gravity of the battery (114) is the rear handle axis R and the electric motor axis (M) in the entire side view of the electric chain saw (100). ) And the horizontal axis (N) intersecting,
The longitudinal direction is such that the electric motor (110) and the rear handle (106) are disposed under the rear handle (106) when the electric chain saw (100) is viewed from the entire side. Away along the direction perpendicular to the axis (L),
With respect to the position of the overall center-of-gravity of the electric chain saw when there is no the battery, the arrangement of the center of gravity of the battery (114), wherein towards the rear handle (106), in particular to move the total center of gravity of the electric chain saw Become
The chain saw (100) , wherein the center of gravity (116) of the battery (114) is disposed on a central plane P of the rear handle (106) in a lateral direction .   The chainsaw (100) of claim 1, wherein the battery (114) includes a central plane P of the rear handle (106) in a lateral direction.   The chainsaw (100) of claim 1, wherein the battery (114) is at least partially disposed at a rear portion of the rear handle along the longitudinal axis (L).   The chainsaw (100) of claim 1, wherein the battery (114) is at least partially disposed at the rear of the electric motor (110) along the longitudinal axis (L).   The chain saw (100) according to claim 1, wherein the battery (114) is detachably attached to the tool body (102) from the left.   The chain saw (100) according to claim 1, wherein the battery (114) is detachably attached to the tool body (102) from the right.   The chain saw (100) according to claim 1, wherein the battery (114) is detachably attached to the tool body (102) from above.   The chain saw (100) according to claim 1, wherein the battery (114) is detachably attached to the tool body (102) from below.   The chain saw (100) according to claim 1, wherein the battery (114) is detachably attached to the tool body (102) from the rear. Wherein said at least one battery cell (204) is, chain saw as claimed in claim 1 which is parallel to the motor shaft (112) to any one of claims 9 (100).

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