Chain saw

Abstract

The invention provides a chain saw. The chainsaw includes a guide bar including an outer rail. The chainsaw also includes a chain movably coupled to the outer rail. The chainsaw also includes a housing defining an interior in which at least a portion of the guide bar and at least a portion of the power device are disposed. The housing includes upper and lower surfaces spaced apart along a vertical axis, first and second side surfaces spaced apart along a transverse axis, and front and rear surfaces spaced apart along a longitudinal axis. The chainsaw also includes a power device mounted within the interior and operable to move the chain relative to the guide bar.

Description

Technical Field

[0001] The present disclosure generally relates to outdoor power tools, and more particularly, to a chainsaw. Background Art

[0002] Outdoor power tools such as chainsaws utilize a toothed moving chain to cut into materials such as wood. The teeth are driven along an outer path of a guide bar in a continuous manner by a drive element. The drive element is controlled by a trigger located on a handle of the chainsaw. When an operator engages the trigger, the speed of the drive element changes, resulting in operation of the chainsaw.

[0003] Recently, battery-powered outdoor power tools have become increasingly popular. However, battery life is a common issue. Additionally, battery placement can be a problem as it relates to the balance and ergonomics of the chainsaw.

[0004] Therefore, improvements to address the problems described above are desired and would be advantageous in the art. Summary of the Invention

[0005] Aspects and advantages of the present disclosure will be set forth in part in the description that follows, or may be obvious from the description, or may be learned by practice of the technology.

[0006] According to one embodiment, a chainsaw is provided. The chainsaw includes: a guide bar; a chain movably coupled to an outer track; a power device operable to move the chain relative to the guide bar; a housing; and a battery docking portion. The housing may define an interior. At least a portion of the guide bar and at least a portion of the power device are disposed within the interior. The housing includes an upper surface and a lower surface spaced apart along a vertical axis, a first side surface and a second side surface spaced apart along a transverse axis, and a front surface and a rear surface spaced apart along a longitudinal axis. The battery docking portion is disposed on the housing at the upper surface.

[0007] According to another embodiment, a chainsaw is provided. The chainsaw includes a guide bar, a chain, a housing, and a power device. The guide bar includes an outer track. The chain is movably coupled to the outer track. The housing defines an interior. At least a portion of the guide bar and at least a portion of the power device are disposed within the interior. The housing includes an upper surface and a lower surface spaced apart along a vertical axis, a first side surface and a second side surface spaced apart along a transverse axis, and a front surface and a rear surface spaced apart along a longitudinal axis. The housing defines an air inlet upstream within the interior and an air outlet downstream within the interior. The air outlet is defined below the air inlet. The power device is mounted within the interior in fluid communication between the air inlet and the air outlet. The power device is operable to move the chain relative to the guide bar.

[0008] According to another embodiment, a chainsaw is provided. The chainsaw includes a guide bar, a chain, a housing, a power device, and a lubrication system. The guide bar includes an outer track. The chain is movably coupled to the outer track. The housing defines an interior. At least a portion of the guide bar and at least a portion of the power device are disposed within the interior. The housing includes an upper surface and a lower surface spaced apart along a vertical axis, a first side surface and a second side surface spaced apart along a transverse axis, and a front surface and a rear surface spaced apart along a longitudinal axis. The power device is mounted within the interior and is operable to move the chain relative to the guide bar. The lubrication system provides lubricant to the chain and includes: a reservoir that houses the lubricant; a pump that is in mechanical communication with the power device to be driven by the power device; and an output configured to supply lubricant to the guide bar and the chain.

[0009] These and other features, aspects, and advantages of the present disclosure will become better understood with reference to the following description and the appended claims. The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the technology and, together with the description, serve to explain the principles of the technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] For the ordinary skill in the art, a complete and enabling disclosure of the present application, including the best mode of making and using the system and method, is set forth in the specification with reference to the accompanying drawings, in which:

[0011] Figure 1 is a perspective view of a chainsaw according to an embodiment of the present disclosure;

[0012] Figure 2 is another perspective view of a portion of a chainsaw according to an embodiment of the present disclosure;

[0013] Figure 3 is a top view of a chainsaw according to an embodiment of the present disclosure;

[0014] Figure 4 is a bottom view of a chainsaw according to an embodiment of the present disclosure;

[0015] Figure 5 is a rear view of a chainsaw according to an embodiment of the present disclosure;

[0016] Figure 6 is a front view of a chainsaw according to an embodiment of the present disclosure;

[0017] Figure 7 is a side view of a chainsaw according to an embodiment of the present disclosure;

[0018] Figure 8 is an opposite side view of a chainsaw according to an embodiment of the present disclosure;

[0019] Figure 9 is according to an embodiment of the present disclosure Figure 9Side view, with a portion of the housing removed to expose the internal components of the chainsaw;

[0020] Figure 10 Is a bottom view of a chainsaw according to an embodiment of the present disclosure, with the housing removed to expose the internal components of the chainsaw;

[0021] Figure 11 Is a rear perspective view of a chainsaw according to an embodiment of the present disclosure;

[0022] Figure 12 Is according to an embodiment of the present disclosure Figure 11 Rear perspective view, with the battery removed;

[0023] Figure 13 Is a perspective view of a battery for a chainsaw according to an embodiment of the present disclosure;

[0024] Figure 14 Is another perspective view of a battery for a chainsaw according to an embodiment of the present disclosure;

[0025] Figure 15 Is a perspective view of a chainsaw according to an embodiment of the present disclosure, with the side portion of the housing removed to expose the internal components of the chainsaw;

[0026] Figure 16 Is an enlarged perspective view of a chainsaw according to an embodiment of the present disclosure, with the housing removed to expose the internal components of the chainsaw;

[0027] Figure 17 Is a perspective view of a chainsaw according to an embodiment of the present disclosure;

[0028] Figure 18 Is an enlarged perspective view of a chainsaw according to an embodiment of the present disclosure, with a portion of the housing removed to expose the internal components of the chainsaw;

[0029] Figure 19 Is another enlarged perspective view of a chainsaw according to an embodiment of the present disclosure, with a portion of the housing removed and certain components made transparent to expose the internal components of the chainsaw;

[0030] Figure 20 Is a perspective view of a lubricant pump according to an embodiment of the present disclosure;

[0031] Figure 21A Is Figure 20 Side view of the lubricant pump at high flow rate setting, with the housing of the pump shown in semi-transparent manner;

[0032] Figure 21B Is Figure 20 Side view of the lubricant pump at the lowest flow rate setting, with the housing of the pump shown in semi-transparent manner; and

[0033] Figure 22 is a perspective view of a lubricant pump according to an embodiment of the present disclosure. Detailed Description

[0034] Reference will now be made in detail to embodiments of the present disclosure, one or more examples of which are illustrated in the accompanying drawings. The word ″exemplary″ as used herein means ″serving as an example, instance, or illustration″. Any implementation described herein as ″exemplary″ is not necessarily to be construed as preferred or superior to other implementations. In addition, each example is provided by way of explanation, and not a limitation, of the technology. In fact, it will be apparent to those skilled in the art that modifications and variations can be made to the technology without departing from the scope or spirit of the claimed technology. For example, features illustrated or described as part of one embodiment can be used with another embodiment to yield a still further embodiment. Accordingly, the present disclosure is intended to cover such modifications and variations that fall within the scope of the appended claims and their equivalents. The detailed description uses numerical and alphabetical labels to refer to features in the drawings. Like or similar labels in the drawings and the description are used to refer to like or similar parts of the present disclosure.

[0035] As used herein, the terms ″first″, ″second″, and ″third″ can be used interchangeably to distinguish one component from another, and are not intended to denote the position or importance of the respective components. Unless the context clearly dictates otherwise, the singular forms ″a″, ″an″, and ″the″ include plural references. Unless otherwise specified herein, the terms ″coupled″, ″fixed″, ″attached to″, etc. refer to both direct coupling, fixing, or attachment, and indirect coupling, fixing, or attachment through one or more intermediate components or features. As used herein, the terms ″comprises″, ″comprising″, ″includes″, ″including″, ″has″, ″having″, or any other variation thereof are intended to cover non-exclusive inclusion. For example, a process, method, article, or apparatus that includes a series of features is not necessarily limited to those features, but may include other features not expressly listed or inherent to such process, method, article, or apparatus. In addition, unless expressly stated to the contrary, ″or″ refers to an inclusive or rather than an exclusive or. For example, condition A or B is satisfied by any of the following: A is true (or present) and B is false (or absent), A is false (or absent) and B is true (or present), and both A and B are true (or present).

[0036] Approximate terms, such as "about", "substantially", "approximate", or "essentially", include values within ten percent greater than or less than the stated value. When used in the context of an angle or direction, such terms include within ten degrees greater than or less than the stated angle or direction. For example, "substantially vertical" includes directions within ten degrees of vertical in any direction (e.g., clockwise or counterclockwise).

[0037] Benefits, other advantages, and solutions to problems will be described below for specific embodiments. However, benefits, advantages, solutions to problems, and any feature or features that may cause any benefit, advantage, or solution to occur or become more pronounced should not be construed as critical, required, or essential features of any or all claims.

[0038] Generally speaking, the present disclosure relates to a chainsaw that solves one or more of the above problems. More particularly, a chainsaw according to the present disclosure can advantageously provide improved battery life while also having improved ergonomics, which facilitates more efficient and comfortable use.

[0039] Now referring to Figures 1 to 12 and Figure 15 and Figure 17 , a chainsaw 10 according to an embodiment of the present disclosure is provided. The chainsaw 10 may include a guide bar 12. The guide bar 12 may include an outer track 14. The chainsaw 10 may further include a chain 16 that is movably coupled to the guide bar 12, such as coupled to its outer track 14. The chain 16 may include teeth that, when moved along the guide bar, cause the chain to cut into materials such as logs and branches. During operation of the chainsaw 10, the chain 16 may move along the outer track 14 to effect such cutting. Such movement may be caused by a power device that drives the chain.

[0040] The chainsaw 10 may further include a housing 20 that defines an interior 22. The guide bar 12 may extend from the housing 20 such that at least a portion (e.g., end portion 13) of the guide bar 12 extends into and is disposed within the interior 22. For example, the housing 20 may include a guide bar cover portion 24 connected to a main housing portion 26. The guide bar 12 may extend between the main housing portion 26 and the guide bar cover portion 24 such that the end portion 13 is within the interior 22. A fastener assembly 28 that may include such as bolts, screws, and / or other suitable hardware may secure the guide bar 12 to the housing 20, such as to the guide bar cover portion 24 and / or the main housing portion 26.

[0041] The chainsaw 10 may also include a handle, such as a main handle 30. Additionally, in some embodiments, the chainsaw 10 may include an auxiliary handle 32. Further, in some embodiments, a brake 34 may be positioned along the chainsaw 10, such as adjacent to the auxiliary handle 32, for example. The brake 34 may provide a safety brake that prevents the chainsaw 10 from recoiling onto the operator while the chain 16 is moving. In the event of a recoil, the brake 34 may be activated by striking the operator's arm, causing the chain 16 to suddenly decelerate and / or stop. As shown, the brake 34 may be disposed within the interior 22 (e.g., below the battery docking portion 120).

[0042] The chainsaw 10 may also include a power device 40, such as a pneumatic engine or an electric motor (as shown). In some exemplary embodiments, at least a portion of the power device 40, such as the entire power device 40, is disposed within the interior 22, such as within the main housing portion 26. The power device 40 may be operable to move the chain 16 relative to the guide bar 12. For example, the power device 40 may drive a sprocket 42. The sprocket 42 may engage the chain 16 such that rotation of the sprocket 42 causes the chain 16 to move relative to the guide bar 12. The power device may be powered, for example, by a rechargeable energy source such as the battery 100 as shown.

[0043] The chainsaw 10 may also include an actuator 50. The actuator 50, such as a rotatable and / or depressible trigger, may be positioned adjacent to the handle (such as at least partially received within the handle in some embodiments), such as the main handle 30 or the auxiliary handle 32. When depressed, the actuator may engage the power device 40 to move the chain 16. As the actuator 50 is further depressed, the speed of the power device 40 may increase from a stop speed that occurs when the actuator 50 is not depressed to a maximum speed that occurs when the actuator 50 is fully depressed. In this regard, the actuator 50 may variably affect the speed of the power device 40 between the stop speed that occurs when the actuator 50 is not depressed and the maximum speed that occurs when the actuator 50 is fully depressed.

[0044] The chainsaw 10 may also include a lock switch 52. The rotatable and / or depressible lock switch 52 may be positioned adjacent to the handle, such as the main handle 30 or the auxiliary handle 32 (such as partially received within the handle in some embodiments). In some embodiments, the lock switch 52 may be disposed on the same handle as the actuator 50, such as on the side of the handle opposite the actuator 50. The lock switch 52 may be a safety mechanism that prevents the chainsaw 10 from operating unless the switch 52 is activated by the operator. Thus, if the actuator 50 is actuated but the lock switch 52 is not actuated, the chainsaw 10 may not operate. If the lock switch 52 is actuated, then the chainsaw 10 may operate when the actuator 50 is actuated.

[0045] In some embodiments, the chainsaw may further include a controller 60, such as a printed circuit board. The controller 60 may be operably connected to the actuator 50, the lock switch 52, the battery 100, and / or the power device 40, and may control the actuator 50, the lock switch 52, the battery 100, and / or the power device 40 or may be controlled by the actuator 50, the lock switch 52, the battery 100, and / or the power device 40.

[0046] As shown, an orthogonal coordinate system may be defined for the chainsaw 10, and the orthogonal coordinate system may include a longitudinal axis 200, a transverse axis 202, and a vertical axis 204 that may be orthogonal to each other. As shown, the guide bar 12 may extend along the longitudinal axis 200 from the housing 20. The main handle 30 may extend from the housing 20 along the longitudinal axis 200 in a direction opposite to the guide bar 12. The auxiliary handle 32 may extend above the housing 20 along the vertical axis 204. The guide bar cover portion 24 may extend from the main housing portion 26 along the transverse axis 202.

[0047] The housing 20 and particularly its main housing portion 26 may include an upper surface 70 and a lower surface 72 that are spaced apart along the vertical axis 204. The housing 20 and particularly its main housing portion 26 may further include a first side surface 74 and a second side surface 76 that are spaced apart along the transverse axis 202. The housing 20 and particularly its main housing portion 26 may further include a front surface 78 and a rear surface 80 that are spaced apart along the longitudinal axis 200.

[0048] A height 73, a width 77, and a length 81 may be defined for the housing 20. The height 73 may be defined, for example, between the upper surface 70 and the lower surface 72 along the vertical axis 204. The width 77 may be defined, for example, between the first side surface 74 and the second side surface 76 along the transverse axis 202. The length 81 may be defined, for example, between the front surface 78 and the rear surface 80 along the longitudinal axis 200. In some embodiments, the maximum length 81 of the housing 20 may be greater than the maximum width 77 of the housing 20. In some embodiments, the maximum length 81 of the housing 20 may be greater than the maximum height 73 of the housing 20.

[0049] The housing 20 may further include an upper housing portion 84 and a lower housing portion 86. The upper housing portion 84 may be above the lower housing portion 86 along the vertical axis 204. In an exemplary embodiment, the maximum width 77 of the upper housing portion 84 (e.g., the housing 20 at the upper housing portion 84) may be greater than the maximum width 77 of the lower housing portion 86 (e.g., the housing 20 at the lower housing portion 86).

[0050] As discussed and now additionally referring to Figure 13 and Figure 14, the chainsaw 10 may include a battery 100. When connected to the chainsaw 10, the battery 100 may be operatively connected to the chainsaw 10, such as a power device 40, and may supply power to the chainsaw 10 (such as the power device 40). The battery 100 may be removably coupled to the chainsaw 10, such as removably coupled to the housing 20, to provide such power. For example, the chainsaw 10 may also include a battery docking portion 120 disposed on the housing 20. The battery 100 may be removably coupled to the chainsaw 10 through the battery docking portion 120. When the battery 100 is coupled to the battery docking portion 120, power from the battery 100 may be supplied to the power device 40 through the battery docking portion 120.

[0051] Now referring specifically to Figures 11 to 14 , the battery docking portion 120 may be disposed on the upper surface 70 of the housing 20. As shown, the upper surface 70 and thus the battery docking portion 120 may be disposed at an angle 122 with respect to the longitudinal axis 200. The angle 122 may be a downward angle along the longitudinal axis 200 from the rear surface 80 toward the front surface 78. In an exemplary embodiment, the angle 122 may be between 2 degrees and 25 degrees, such as between 12 degrees and 20 degrees, such as between 14 degrees and 18 degrees. In an alternative embodiment, the angle 122 is approximately 16 degrees. In an alternative embodiment, the angle 122 is approximately 4 degrees.

[0052] The battery docking portion 120 may include one or more tracks 124 defining one or more channels 126. The battery docking portion 120 may also include a latch 128. The battery 100 may include one or more tracks 104 defining one or more channels 106. The battery 100 may also include a latch docking portion 108. The tracks 124 and the channels 126 may extend along the longitudinal axis 200. By sliding the battery 100 along the battery docking portion 120, such as along the longitudinal axis 200, the battery 100 may be coupled to the housing 20. During such coupling movement, the tracks 124 may slide into the channels 106, and the tracks 104 may slide into the channels 126. When the battery 100 is fully inserted into the battery docking portion 120, the latch 128 (which may be spring-biased) may lock into place in the latch docking portion 108 to removably lock the battery 100 in the battery docking portion 120 and on the housing 20. To remove the battery 100 from the battery docking portion 120, the user may press down on the latch 128 (such as via a press release 129) and slide the battery away from the housing 20 along the longitudinal axis 200. The latch 128 may be disposed on the upper surface 70 and / or the rear surface 80 as shown.

[0053] The battery docking portion 120 may further include an electrical contact 130. When the battery is fully inserted into the battery docking portion 120, the electrical contact 130 docks with the electrical contact of the battery 100, thus facilitating the operable connection between the battery 100 and the power device 40.

[0054] As shown, the battery 100 may be disposed on the upper surface 70. Thus, the battery 100 may be disposed on the upper housing portion 84 and above the upper housing portion 84 along the vertical axis 204. In an exemplary embodiment, as shown, the battery 100 may be disposed at an angle 102 relative to the longitudinal axis 200. The angle 102 may be a downward angle along the longitudinal axis 200 from the rear surface 80 towards the front surface 78. In an exemplary embodiment, the angle 102 may be between 2 degrees and 25 degrees, such as between 12 degrees and 20 degrees, such as between 14 degrees and 18 degrees. In an alternative embodiment, the angle 102 is approximately 16 degrees. In an alternative embodiment, the angle 102 is approximately 4 degrees.

[0055] A height 112, a width 114, and a length 116 may be defined for the battery 100. The height 112 may be defined, for example, between the upper surface and the lower surface along the vertical axis 204. The width 114 may be defined, for example, between the first side surface and the second side surface along the transverse axis 202. The length 116 may be defined, for example, between the front surface and the rear surface along the longitudinal axis 200. In some embodiments, the maximum length 116 of the battery 100 may be greater than the maximum width 114 of the battery 100. In some embodiments, the maximum length 116 of the battery 100 may be greater than the maximum height 112 of the battery 100. In some embodiments, the maximum width 114 of the battery 100 may be greater than the maximum height 112 of the battery 100.

[0056] In an exemplary embodiment, the maximum width 114 of the battery 100 may be at least 90%, such as at least 95%, such as at least 98%, such as at least 99%, such as 100% of the maximum width 77 of the housing 20, such as the upper housing portion 84.

[0057] In some embodiments, the maximum length 116 of the battery 100 is between 200 millimeters (mm) and 300 mm, such as between 230 mm and 280 mm. In some embodiments, the maximum width 114 of the battery 100 is between 90 mm and 200 mm, such as between 95 mm and 185 mm, such as in some embodiments between 95 mm and 105 mm, such as 100 mm in some embodiments, such as between 180 mm and 185 mm in some embodiments, such as 181 mm in some embodiments. In alternative embodiments, the width of the battery is variable, such as defining a maximum width 114 and a discrete minimum width. In some such embodiments, the minimum width is between 70 mm and 150 mm, such as between 80 mm and 125 mm, such as 100 mm in some embodiments. In some embodiments, the maximum height 112 of the battery 100 is between 75 mm and 115 mm, such as between 90 mm and 110 mm. In some embodiments, the volume of the battery is between 3200 cubic centimeters (cm 3 ) and 5800 cubic centimeters, such as between 3700 cm 3 and 5300 cm 3 , such as between 4100 cm 3 and 4900 cm 3 .

[0058] In an exemplary embodiment, the maximum width 77 of the housing 20 is between 180 mm and 185 mm, such as between 181 mm and 183 mm, such as 182.5 mm.

[0059] In an exemplary embodiment, the battery 100 is a lithium-ion battery. In an exemplary embodiment, the battery 100 can provide at least 5 amp-hours, such as at least 5.5 amp-hours, such as at least 5.8 amp-hours, such as at least 6 amp-hours.

[0060] In an exemplary embodiment, the weight of the battery 100 is between 8 pounds and 12 pounds, such as between 9 pounds and 11 pounds, such as between 10 pounds and 10.8 pounds.

[0061] In an exemplary embodiment, the center of gravity of the chainsaw is located within the housing 20, such as within the interior 22. The center of gravity is calculated with the battery connected to the housing 20 and including all other necessary components of the chainsaw 10.

[0062] A suitable battery for the chainsaw 10 according to the present disclosure is the MX fuel cell available from the Milwaukee Electric Tool Company.

[0063] In an exemplary embodiment, the battery 100 may be disposed above the main handle 30 along the vertical axis 204, and in some embodiments, above the actuator 50. In an exemplary embodiment, the uppermost portion of the auxiliary handle 32 may be disposed above the battery 100 along the vertical axis 204. For example, the auxiliary handle 32 may wrap around the battery 100 such that the battery is mounted to the housing 20 at one end, extends above the battery (e.g., at the uppermost portion of the auxiliary handle 32), and is mounted to another (e.g., bottom) portion of the housing 20 at the opposite end. In an exemplary embodiment, the battery 100 may be disposed behind the brake 34 along the longitudinal axis 200. In additional or alternative embodiments, the battery 100 may be disposed above the brake 34 along the vertical axis 204. Additionally or alternatively, the interior 22 and any features disposed therein in some embodiments may be disposed below the battery 100 along the vertical axis 204.

[0064] Such a configuration of the battery 100 may advantageously allow for the use of a relatively large battery, which allows for improved performance while also providing improved efficiency and ergonomics of the chainsaw 10.

[0065] Now referring specifically to Figure 9 and Figure 10 , as discussed, in an exemplary embodiment, a controller 60, such as one or more printed circuit boards 60, may be disposed within the housing 20, such as within the interior 22. In an exemplary embodiment, at least 90% (as measured by volume), such as at least 95% (as measured by volume), of the printed circuit board 60 may be disposed within the lower housing portion 86.

[0066] In some embodiments, a heat sink 62 may be disposed on one or more printed circuit boards 60. The heat sink 62 may extend along at least 90%, such as at least 95%, such as at least 98% of the width and height of the corresponding printed circuit board 60.

[0067] In an exemplary embodiment, one or more printed circuit boards 60 may be disposed at an angle 64 relative to the longitudinal axis 200. The angle 64 may be a downward angle from the front surface 78 toward the rear surface 80 along the longitudinal axis 200. In an exemplary embodiment, the angle 64 may be between 5 degrees and 65 degrees, between 10 degrees and 20 degrees, between 40 degrees and 60 degrees, such as between 45 degrees and 55 degrees, such as between 48 degrees and 52 degrees.

[0068] Such a configuration of the printed circuit board 60 may advantageously allow for the use of a relatively large printed circuit board 60, e.g., having relatively large capacitors, in a relatively small space. This advantageously allows for improved performance, efficiency, and ergonomics of the chainsaw 10.

[0069] Now specifically turning to Figures 15 to 17 , the airflow path 210 can be defined by the interior 22. Specifically, the airflow path 210 can be defined as extending from an air inlet 212 upstream of the interior 22 to an air outlet 214 downstream of the interior 22. In some embodiments, one or both of the air inlet 212 and the air outlet 214 can be defined as passing through the housing 20. Additionally, one or more of the printed circuit boards 60 can be disposed along the airflow path 210.

[0070] As shown, the air inlet 212 can be defined at the rearward half or the rear half of the housing 20. For example, the air inlet 212 can generally be defined as one or more openings disposed at the rear end of the housing 20. Additionally or alternatively, the air inlet 212 can be defined along the longitudinal axis 200. Thus, the air flowing into the interior 22 can travel along or parallel to the longitudinal axis 200. As shown, the main handle 30 can extend rearward from the housing 20 (e.g., in a direction opposite to the guide rod 12). In some such embodiments, the air inlet 212 is disposed below the main handle 30. As an example, the air inlet 212 can be defined between the main handle 30 and the lower surface 72 (e.g., by a rearward-facing wall or surface). In some such embodiments, the main handle 30 and the lower surface 72 form a hand loop within which a user's hand can be received. As shown, the air inlet 212 can be directed into the hand loop (e.g., to draw air therefrom).

[0071] Downstream of the interior 22, the air outlet 214 can be defined (e.g., through the housing 20). In some embodiments, the air outlet 214 is defined below the air inlet 212. Thus, relative to the vertical axis 204, the air outlet 214 can be defined at a position lower than the air inlet 212. Additionally or alternatively, the air outlet 214 can be spaced from the air inlet 212 relative to the longitudinal axis 200 (e.g., forward). In certain embodiments, the air outlet 214 is defined as passing through the lower surface 72 at a position or region such as below the power device 40. Optionally, the air outlet 214 can be directly defined below the power device 40. As shown, the air outlet 214 can be directed downward (e.g., to direct air below the housing 20).

[0072] As shown, a fan 216 having one or more air vanes (e.g., a radial fan, a tangential fan, or an impeller) may be mounted within a housing 20 (e.g., along an air flow path 210) to generate or promote an air flow from an air inlet 212 to an air outlet 214. In some such embodiments, the fan 216 is mounted on or in mechanical communication with a power device 40. For example, the fan 216 may be mounted to the power device 40 opposite the sprocket 42 (e.g., relative to a transverse axis 202). In turn, rotation of the chain or sprocket 42 may simultaneously rotate the fan 216 to generate an air flow through the interior 22. In an alternative embodiment, a sub-housing 220 is disposed within the interior 22. In particular, the sub-housing 220 may provide a solid body along and through which a portion of the air flow path 210 is defined. In turn, the sub-housing 220 may define a housing inlet 222 and a housing outlet 224. The housing inlet 222 may be defined, for example, along a longitudinal direction 200 or otherwise directed toward the air inlet 212. Optionally, the housing inlet 222 may be defined at a position higher relative to the vertical direction 204 than the air inlet 212. Additionally or alternatively, the housing outlet 224 may be defined, for example, along the vertical direction 204 or otherwise directed toward the air outlet 214. Optionally, the housing outlet 224 may be defined at a position lower relative to the vertical direction 204 than the housing inlet 222 (e.g., directly above the air outlet 214). As shown, the sub-housing 220 may house one or more components, such as the fan 216 or portions of the power device 40. The curved inner wall of the sub-housing 220 may wrap around at least a portion of the fan 216 or the power device 40. During use, the air along the air flow path 210 may gradually change direction from a substantially longitudinal flow to a substantially vertical flow (e.g., as the air passes across the fan 216 or the power device 40).

[0073] Turning now to Figures 17 to 22 , a lubrication system 302 (e.g., within the interior 22) may be provided. Generally, the lubrication system 302 may distribute or deliver lubricant to the chain.

[0074] As shown, the lubrication system 302 includes a lubricant reservoir 330 configured to hold lubricant. The lubricant reservoir 330 is fluidly coupled to a pump 334 via a first hose 336 (also referred to as a hose or the first hose). Downstream of the pump 334, a second hose 338 fluidly couples the pump 334 to an outlet 340 configured to distribute lubricant adjacent the chain to lubricate the chain. The pump 334 may draw lubricant from the reservoir 330 via the hose 336 and deliver the lubricant through the second fluid conduit 338 to provide lubricant at a location adjacent the chain.

[0075] As shown, the pump 334 can be installed within the interior 22 (e.g., proximate the second side housing 20—— Figure 1 ). In some embodiments, the pump 334 is driven by a power device 40. For example, the pump 334 can be in mechanical communication with the same power device 40 that drives the drive chain 14 and / or the fan 216. In certain embodiments, the pump 334 is connected to the motor shaft 230 of the power device 40 opposite the fan 216 and the sub-housing 220( Figure 15 ).

[0076] Figure 20 and Figures 21A to 21B FIG. illustrates an embodiment of a pump 334 according to the present invention. The pump 334 includes a housing 350 having a first portion 352 extending along a longitudinal direction L and a second portion 354 extending in a second direction D. The second direction D can be generally perpendicular to the longitudinal direction L. The first portion 352 can extend from a first end 356 to a second end 358 along the longitudinal direction L. The second portion 354 can be disposed at the second end 358. In some aspects of the present invention, the first portion 352 can have a generally cylindrical shape, and the second portion 354 can have a generally cylindrical shape. One or more mounting holes 353 can be provided in the housing 350, e.g., extending from the generally cylindrical shape of the first portion 352.

[0077] The pump 334 includes a lubricant inlet 380 and a lubricant outlet 382, which are generally disposed near the first end 356 and / or spaced from the second part 354. The lubricant inlet 380 can be coupled to a fluid hose 336 or a first hose to draw lubricant from a reservoir 330 into the pump 334, and the lubricant outlet 382 can be coupled to a fluid hose 338 or a second hose to pump the lubricant to an output 340. A chamber 381 is provided between the lubricant inlet 380 and the lubricant outlet 382 for the lubricant to pass therethrough.

[0078] The pump 334 includes a piston 360 extending within the first portion 352 (as Figures 21A to 21B best seen). The piston 360 has a first end 362 and a second end 364. At the first end 362, the piston includes a cutout portion 366, e.g., a flat or circular cut surface extending inwardly from the first end 362 along the longitudinal direction L. The cutout portion 366 can be configured to be disposed between the lubricant inlet 380 and the lubricant outlet 382. At the second end, the piston 360 has an inclined surface 368 that forms a cam surface.

[0079] The piston 360 further includes a gear 370 that is configured to engage with the motor shaft 230( Figure 18)Operably coupled to reciprocate the piston 360 along the longitudinal direction L. The gear 370 may extend around the perimeter of the piston 360. The spring 372 may be positioned around the piston 360. For example, the spring 372 may be around a portion of the piston 360. The spring 372 may be configured to bias the piston 360 toward the first end 356 or the second end 358 of the housing 350. For example, as Figures 21A to 21B shown, the spring 372 may bias the piston 360 toward the second end 358.

[0080] The piston 360 may further include at least one seal 374. For example, the piston 360 may include a passage 376 disposed between the cutout portion 366 and the second end 364 around the perimeter of the piston 360, and the seal 374 may be disposed within the passage 376. The seal 374 may be an O-ring or any other suitable seal to prevent the lubricant from spreading between the seal 374 and the second end 364.

[0081] In some embodiments, the pump 334 further includes a lubricant flow rate regulating system. The lubricant flow rate regulating system may be configured to regulate the flow rate of the pump 334 in a range from about 3 milliliters per minute (mL / min) to about 20 milliliters per minute, i.e., over a range spanning about 17 milliliters per minute. Notably, compared with existing lubricant flow rate regulators for outdoor power tools, the lubricant flow rate regulating system of the present invention may provide a more superior flow rate range.

[0082] The lubricant flow rate regulating system includes a regulator 384 that is operatively coupled to a second portion 354 of the pump housing 350. The regulator 384 can extend along a second direction D and extend within the second portion 354 of the housing 350. The regulator 384 includes a pointed head segment 386 that is configured to operatively contact an inclined surface 368 of the piston 360. At least a portion of the regulator 384 that includes a pin 388 is configured to extend outward from an opening 390 of the second portion 354 of the pump housing 350. At an end of the regulator 384 opposite the pin 388, the regulator 384 can include a slot 400 on a bottom surface 402 of the regulator 384. The slot 400 can be a minus sign slot (i.e., a straight line similar to a minus sign "-" formed across the lower surface of the regulator 384), or any other suitable shaped slot or keyed opening in the lower surface of the regulator 384. A regulator spring 404 can be positioned around the regulator 384, for example, between a bottom surface 402 of the second portion 354 of the pump housing 350 and a lower surface 406 to bias the regulator 384 downward along the second direction D. The slot 400 can be operatively coupled to a control mechanism (not shown) that can be configured to engage the slot 400 and rotate the regulator 384 to a rotational position corresponding to a desired one of the detents 394 for an intended lubricant flow rate.

[0083] The lubricant flow rate regulating system of the present invention that includes the regulator 384 can have a holding force of about 2 inch-pounds (in-lb) torque or greater, for example, more than 2 inch-pounds torque. Notably, compared to existing outdoor power tool lubricant regulators, increasing the holding force of the lubricant flow rate regulating system of the present invention enables more accurate regulation of the flow rate by preventing the regulator 384 from being inadvertently rotated (and thus inadvertently changing the flow rate).

[0084] The second portion 354 has a top surface 392 surrounding the opening 390. The top surface 392 includes a plurality of detents 394 having different heights in the direction D. The pin 388 is configured to extend from the regulator 384 in a direction generally perpendicular to the second direction D such that the pin 388 can rest on or seat within one of the detents 394. As Figure 2Best visible in, the top surface 392 includes a plurality of positioning portions 394, such as at least four positioning portions, at least six positioning portions, at least eight positioning portions or more positioning portions, each positioning portion extending at a different height along the direction D. In a particular embodiment, there may be seven positioning portions 394. The positioning portions 394 may increase in height from the first positioning portion 394a to the final positioning portion 394x. The positioning portions 394 may increase in height around the perimeter of the second portion 354 of the housing 350. For example, in some aspects, the positioning portions 394 may extend around the entire 360-degree perimeter of the second portion 354, or the positioning portions 394 may only extend around a portion of the perimeter of the second portion 354. For example, as Figure 20 shown, the positioning portions 394 may extend at an angle of approximately 270 degrees around the perimeter of the second portion 354.

[0085] By changing the point of contact between the tip section 386 of the regulator 384 and the inclined surface 368 of the piston 360, the height of each corresponding positioning portion in the positioning portions 394 can correspond to the amount of reciprocating movement of the piston 360 along the direction L. For example, as Figure 21B shown, when the pin 388 moves to a positioning portion 394 with an increasing height, the tip section 386 increases in height along the direction D, thereby reducing the reciprocating motion range of the piston 360 due to the point of contact between the tip section 386 and the inclined surface 368 of the piston 360. When the reciprocating motion range of the piston 360 in the longitudinal direction L is reduced, since the motion range of the cutout portion 366 between the inlet 380 and the outlet 382 is reduced, less lubricant can pass from the inlet 380 through the pump 334 to the outlet 382. In contrast, for example, as Figure 20 and Figure 21A shown, when the pin 388 is set at the lowest positioning portion 394a, the pump 334 can operate at the maximum lubricant flow rate by enabling the maximum reciprocating motion range of the piston 360.

[0086] In some aspects of the present invention, a cap 408 may be provided to cover the upper end portion of the regulator 384 and the second portion 354 of the housing 350. For example, the cap 408 may be used as a grease cap to retain any grease or lubricant on the top surface 392 of the second portion 354 and / or the regulator 384. In some aspects, the cap 408 may have a generally cylindrical shape as shown in Figure 22 However, a cap 408 of any suitable shape is used to retain the grease or lubricant and prevent the grease or lubricant from leaving the housing 350.

[0087] Figure 20 and Figures 21A to 21BIllustrated is a pump 334 having an idler gear type piston 360. In other words, the piston 360 has a gear 370 disposed generally at an intermediate portion of the piston 360. As Figure 20 and Figures 21A to 21B shown in, a housing 350, such as a first portion 352 of the housing 350, includes an opening 371 configured to expose the gear 370. In this arrangement, the gear 370 is disposed along the piston 360 at a position between an inclined surface 368 at a second end 364 and a cutout portion 366 at a first end 362. However, the present invention contemplates any suitable type of piston gear assembly.

[0088] Other aspects of the present disclosure are provided by one or more of the following embodiments:

[0089] A chainsaw, comprising: a guide bar including an outer track; a chain movably coupled to the outer track; a power device operable to move the chain relative to the guide bar; a housing defining an interior, wherein at least a portion of the guide bar and at least a portion of the power device are disposed within the interior, the housing including an upper surface and a lower surface spaced apart along a vertical axis, a first side surface and a second side surface spaced apart along a transverse axis, and a front surface and a rear surface spaced apart along a longitudinal axis; and a battery docking portion disposed on the housing at the upper surface.

[0090] The chainsaw according to any one or more of the embodiments disclosed herein further includes a brake disposed within the interior below the battery docking portion.

[0091] The chainsaw according to any one or more of the embodiments disclosed herein further includes a battery removably coupled to the housing through the battery docking portion, the battery being disposed at a downward angle in a direction from the rear surface toward the front surface relative to the longitudinal axis.

[0092] The chainsaw according to any one or more of the embodiments disclosed herein, wherein the angle is between 2 degrees and 25 degrees.

[0093] The chainsaw according to any one or more of the embodiments disclosed herein further includes: a battery removably coupled to the housing through the battery docking portion; and an auxiliary handle mounted to the housing and extending above the battery.

[0094] The chainsaw according to any one or more of the embodiments disclosed herein, wherein the housing defines an air inlet upstream within the interior and an air outlet downstream within the interior, the air outlet being defined below the air inlet.

[0095] A chainsaw according to any one or more of the embodiments disclosed herein further includes a main handle that extends rearwardly from the housing in a direction opposite to the guide bar, wherein an air inlet is defined through the housing between the main handle and the lower surface, and wherein an air outlet is defined through the lower surface.

[0096] A chainsaw according to any one or more of the embodiments disclosed herein further includes a printed circuit board disposed within an interior that is in fluid communication between the air inlet and the air outlet.

[0097] A chainsaw according to any one or more of the embodiments disclosed herein, wherein the printed circuit board is disposed at an angle between 10 degrees and 20 degrees relative to the longitudinal axis.

[0098] A chainsaw according to any one or more of the embodiments disclosed herein further includes: a sub-housing disposed within an interior that is in fluid communication between the air inlet and the air outlet; and a fan mounted to a power device within the sub-housing.

[0099] A chainsaw according to any one or more of the embodiments disclosed herein further includes a lubrication system that supplies lubricant to the chain, the lubrication system including: a reservoir that holds the lubricant; a pump that is mechanically connected to the power device to be driven by the power device; and an outlet that is configured to supply lubricant to the guide bar and the chain.

[0100] A chainsaw includes: a guide bar that includes an outer track; a chain that is movably coupled to the outer track; a housing that defines an interior, wherein at least a portion of the guide bar and at least a portion of a power device are disposed within the interior, the housing including an upper surface and a lower surface spaced apart along a vertical axis, a first side surface and a second side surface spaced apart along a transverse axis, and a front surface and a rear surface spaced apart along a longitudinal axis, the housing defining an air inlet upstream within the interior and an air outlet downstream within the interior, the air outlet being defined below the air inlet; and a power device mounted within the interior that is in fluid communication between the air inlet and the air outlet, the power device being operable to move the chain relative to the guide bar.

[0101] A chainsaw according to any one or more of the embodiments disclosed herein further includes a main handle that extends rearwardly from the housing in a direction opposite to the guide bar, wherein an air inlet is defined through the housing between the main handle and the lower surface, and wherein an air outlet is defined through the lower surface.

[0102] A chainsaw according to any one or more of the embodiments disclosed herein further includes a printed circuit board disposed within an interior that is in fluid communication between the air inlet and the air outlet.

[0103] A chainsaw according to any one or more of the embodiments disclosed herein, wherein the printed circuit board is disposed at an angle between 10 degrees and 20 degrees relative to the longitudinal axis.

[0104] A chainsaw according to any one or more of the embodiments disclosed herein, further comprising: a sub-housing disposed within an interior that is in fluid communication between an air inlet and an air outlet; and a fan mounted to a power device within the sub-housing.

[0105] A chainsaw according to any one or more of the embodiments disclosed herein, further comprising a lubrication system that supplies lubricant to the chain, the lubrication system including: a reservoir that holds the lubricant; a pump that is mechanically connected to the power device to be driven by the power device; and an output configured to supply lubricant to the guide bar and the chain.

[0106] A chainsaw comprising: a guide bar including an outer track; a chain movably coupled to the outer track; a housing that defines an interior, wherein at least a portion of the guide bar and at least a portion of a power device are disposed within the interior, the housing including an upper surface and a lower surface spaced apart along a vertical axis, a first side surface and a second side surface spaced apart along a transverse axis, and a front surface and a rear surface spaced apart along a longitudinal axis; a power device mounted within the interior and operable to move the chain relative to the guide bar; and a lubrication system that supplies lubricant to the chain, the lubrication system including: a reservoir that holds the lubricant; a pump that is mechanically connected to the power device to be driven by the power device; and an output configured to supply lubricant to the guide bar and the chain.

[0107] A chainsaw according to any one or more of the embodiments disclosed herein, further comprising: a sub-housing disposed within an interior that is in fluid communication between an air inlet and an air outlet; and a fan mounted to the power device within the sub-housing adjacent to the first side surface, wherein the pump is disposed adjacent to the second side surface.

[0108] A chainsaw according to any one or more of the embodiments disclosed herein, wherein the power device includes a motor shaft, and wherein the pump includes: a piston disposed within a housing; a biasing spring configured to bias the piston in a first direction; and a gear configured to be operably coupled to the motor shaft to drive the movement of the piston.

[0109] This written description uses examples that include the best mode to disclose the present application and also enables any person skilled in the art to practice the present disclosure, including making and using any device or system and performing any combined method. The patentable scope of the present disclosure is defined by the claims and may include other examples that occur to those skilled in the art. If such other examples include structural elements that are identical to the literal language of the claims or if such other examples include equivalent structural elements that do not differ materially from the literal language of the claims, then such other examples are intended to be within the scope of the claims.

Claims

1. A chain saw, characterized in that, The chain saw includes: A guide bar, the guide bar including an outer track; A chain, the chain being movably coupled to the outer track; A power device, the power device being operable to move the chain relative to the guide bar; A housing, the housing defining an interior, wherein at least a portion of the guide bar and at least a portion of the power device are disposed within the interior, the housing including an upper surface and a lower surface spaced apart along a vertical axis, a first side surface and a second side surface spaced apart along a transverse axis, and a front surface and a rear surface spaced apart along a longitudinal axis; and A battery docking portion, the battery docking portion being disposed on the housing at the upper surface.

2. The chainsaw according to claim 1, characterized in that, The chain saw further includes a brake mounted within the interior below the battery docking portion.

3. The chainsaw according to claim 1, characterized in that, The chain saw further includes a battery, the battery being removably coupled to the housing via the battery docking portion, the battery being disposed at a downward angle in a direction from the rear surface toward the front surface relative to the longitudinal axis.

4. The chain saw according to claim 3, characterized in that, The angle is between 2 degrees and 25 degrees.

5. The chain saw according to claim 1, characterized in that, The chain saw further includes: A battery, the battery being removably coupled to the housing via a battery docking portion; and An auxiliary handle, the auxiliary handle being mounted to the housing and extending above the battery.

6. The chainsaw according to claim 1, wherein, The housing defines an air inlet upstream of the interior and an air outlet downstream of the interior, the air outlet being defined below the air inlet.

7. The chain saw according to claim 6, characterized in that, The chain saw further includes a main handle, the main handle extending rearward from the housing in a direction opposite to the guide bar, wherein the air inlet is defined through the housing between the main handle and the lower surface, and wherein the air outlet is defined through the lower surface.

8. The chain saw according to claim 6, characterized in that, The chain saw further includes a printed circuit board disposed within the interior in fluid communication between the air inlet and the air outlet.

9. The chain saw according to claim 8, characterized in that, The printed circuit board is disposed at an angle between 10 degrees and 20 degrees relative to the longitudinal axis.

10. The chainsaw according to claim 6, characterized in that, The chain saw further includes: A sub-housing, the sub-housing being disposed within the interior in fluid communication between the air inlet and the air outlet; and A fan, the fan being mounted to the power device within the sub-housing.

11. The chain saw according to claim 1, characterized in that, The chain saw further includes a lubrication system for supplying lubricant to the chain, the lubrication system including: A reservoir, the reservoir containing the lubricant; A pump, the pump being mechanically coupled to the power device to be driven by the power device; and an output configured to supply the lubricant to the guide bar and the chain.

12. A chain saw, characterized in that, The chain saw includes: A guide bar, the guide bar including an outer track; A chain, the chain being movably coupled to the outer track; A housing, the housing defining an interior, wherein at least a portion of the guide bar is disposed within the interior, the housing including an upper surface and a lower surface spaced apart along a vertical axis, a first side surface and a second side surface spaced apart along a transverse axis, and a front surface and a rear surface spaced apart along a longitudinal axis, the housing defining an air inlet upstream of the interior and an air outlet downstream of the interior, the air outlet being defined below the air inlet; and A power device, the power device being installed inside the interior that is in fluid communication between the intake port and the exhaust port, the power device being operable to move the chain relative to the guide bar.

13. The chain saw according to claim 12, characterized in that, The chainsaw further includes a main handle that extends rearward from the housing in a direction opposite to the guide bar, wherein the intake port is defined through the housing between the main handle and the lower surface, and wherein the exhaust port is defined through the lower surface.

14. The chain saw according to claim 12, wherein, The chainsaw further includes a printed circuit board disposed inside the interior that is in fluid communication between the intake port and the exhaust port.

15. The chain saw according to claim 14, characterized in that, The printed circuit board is disposed at an angle between 10 degrees and 20 degrees relative to the longitudinal axis.

16. The chain saw according to claim 12, characterized in that, The chainsaw further includes: A sub-housing disposed inside the interior that is in fluid communication between the intake port and the exhaust port; and A fan mounted to the power device inside the sub-housing.

17. The chain saw according to claim 12, characterized in that, The chainsaw further includes a lubrication system that supplies lubricant to the chain, the lubrication system including: A reservoir that holds the lubricant; A pump that is mechanically connected to the power device to be driven by the power device; and an output configured to supply the lubricant to the guide bar and the chain.

18. A chain saw, characterized in that, The chainsaw includes: A guide bar that includes an outer track; A chain movably coupled to the outer track; A housing that defines an interior, wherein at least a portion of the guide bar is disposed within the interior, the housing including an upper surface and a lower surface spaced apart along a vertical axis, a first side surface and a second side surface spaced apart along a transverse axis, and a front surface and a rear surface spaced apart along a longitudinal axis; A power device installed inside the interior and operable to move the chain relative to the guide bar; and A lubrication system that supplies lubricant to the chain, the lubrication system including: A reservoir that holds the lubricant; A pump that is mechanically connected to the power device to be driven by the power device; and an output configured to supply the lubricant to the guide bar and the chain.

19. The chain saw according to claim 18, characterized in that, The chainsaw further includes: A sub-housing disposed inside the interior that is in fluid communication between the intake port and the exhaust port; and A fan mounted to the power device inside the sub-housing adjacent to the first side surface, wherein the pump is disposed adjacent to the second side surface.

20. The chain saw according to claim 18, characterized in that, The power device includes a motor shaft, wherein the pump includes: A piston disposed inside the housing; A biasing spring configured to bias the piston in a first direction; and A gear configured to be operably coupled to the motor shaft to drive the movement of the piston.

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