Handheld power tool

Abstract

A hand-held power tool, comprising: a housing; a tool receiving portion provided on a first end portion of the housing and configured to receive a tool accessory; and a motor positioned within the housing and operably coupled to the tool receptacle to drive the tool attachment. The dust container is selectively coupled to the housing. A dust tube is coupled to the first end of the housing and is in fluid communication with the dust container, where the dust tube is movable between an extended position and a retracted position. A fan is positioned within the housing and operable to create a suction air flow path through the dust tube and into the dust container, where the fan is rotatably driven by a motor.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to U.S. Provisional Patent Application No. 63 / 169,611 filed on April 1, 2021 and U.S. Provisional Patent Application No. 63 / 211,856 filed on June 17, 2021, the entire contents of each of which are incorporated herein by reference. Technical Field

[0003] The present disclosure relates to power tools and, more particularly, to dust collection assemblies for use with power tools. Background Art

[0004] Dust collection assemblies are often used with handheld drilling tools, such as rotary hammers, to collect dust and other debris during drilling operations, thereby preventing dust and other debris from accumulating at the work site. Such dust collection assemblies can be attached to the rotary hammer to position a suction inlet of the collector proximate to a drill bit attached to the rotary hammer. Such dust collection assemblies can also include an onboard dust container in which dust and other debris accumulate. Such dust containers are typically removable from the dust collection assembly to aid in the disposal of accumulated dust and debris. Utility Model Content

[0005] The present disclosure provides, in one aspect, a handheld power tool, which includes: a housing; a tool housing portion, which is disposed on a first end of the housing and is configured to receive a tool accessory; a drive assembly, which is positioned in the housing and is configured to drive the tool accessory; a motor, which is positioned in the housing and is operably connected to the drive assembly to drive the drive assembly; a dust container, which is selectively connected to the housing; a suction pipe, which is connected to the first end of the housing and is in fluid communication with the dust container, the suction pipe being movable between a first position and a second position; and a suction fan, which is positioned in the housing and is operable to generate an air flow path through the suction pipe and into the dust container.

[0006] The present disclosure provides a handheld power tool, which includes: a housing; a tool receiving portion, which is disposed on a first end of the housing and is configured to receive a tool accessory; and a motor, which is positioned in the housing and operably coupled to the tool receiving portion to drive the tool accessory. A dust container is selectively coupled to the housing. A dust duct is coupled to the first end of the housing and is in fluid communication with the dust container, wherein the dust duct is movable between an extended position and a retracted position. A fan is positioned in the housing and is operable to generate a suction air flow path through the dust duct and into the dust container, wherein the fan is rotatably driven by the motor.

[0007] The present disclosure also provides a handheld power tool, which includes: a housing; a tool receiving portion, which is arranged on a first end of the housing and is configured to receive a tool accessory; a motor, which is positioned in the housing and is operably connected to the tool receiving portion to drive the tool accessory; a dust container, which is selectively connected to the housing; a dust pipe on the drill bit, which is connected to the first end of the housing and is in fluid communication with the dust container, and the dust pipe on the drill bit can be moved between an extended position and a retracted position; and a fan, which is positioned in the housing and is operable to generate an air flow path that passes through the dust pipe and enters the dust container.

[0008] In addition, the present disclosure provides a handheld power tool, which includes: a housing; a tool receiving portion, which is arranged on a first end of the housing and is configured to receive a tool accessory, the tool accessory defining a working axis; a handle, which extends rearwardly from the second end of the housing; a motor, which is positioned in the housing and is operably connected to the tool receiving portion to drive the tool accessory; a dust container, which is selectively connected to the housing; a dust pipe, which is connected to the first end of the housing and is in fluid communication with the dust container, and the dust pipe can be moved between an extended position and a retracted position; a dust transfer pipe, which fluidly connects the dust pipe and the dust container, and the dust transfer pipe extends through at least a portion of the housing; and a fan, which is positioned in the housing and is operable to generate a suction air flow path that passes through the dust pipe and enters the dust container.

[0009] In some embodiments, the dust container is substantially received within the housing.

[0010] In some embodiments, the handheld power tool includes a filter disposed at least partially within the dust container when the dust container is coupled to the housing.

[0011] In some embodiments, the drive assembly, motor, suction fan and filter are arranged in the upper part of the housing.

[0012] In some embodiments, a central axis of the filter and a rotational axis of the suction fan intersect at an obtuse angle.

[0013] In some embodiments, the dust receptacle is prevented from coupling to the housing when the filter is not positioned within the housing.

[0014] In some embodiments, the suction fan is driven by a motor. Further, in some embodiments, the suction fan is mounted on a motor output shaft driven by the motor.

[0015] In some embodiments, the handheld power tool includes a cooling fan driven by the motor and operable to create a second air flow path through the motor to cool the motor.

[0016] In some embodiments, the suction fan and the cooling fan are coaxial.

[0017] In some embodiments, the cooling fan creates a first air flow path from a cooling air intake port positioned behind the motor to a cooling air exhaust port positioned in front of the motor.

[0018] In some embodiments, the suction fan creates a second air flow path that flows from the end of the suction duct to a suction air exhaust port located behind the motor.

[0019] In some embodiments, the handheld power tool includes a transfer tube in fluid communication with the suction tube and the dust container to transfer dust from the suction tube to the dust container, wherein the transfer tube includes a bend between 0 and 90 degrees.

[0020] In some embodiments, the dust container is coupled to the transfer tube through a connection port.

[0021] In some embodiments, the handheld power tool includes a filter cleaning mechanism, wherein the filter cleaning mechanism is operable as an automatic filter cleaning mechanism. Further, in some embodiments, the filter cleaning mechanism is operable as a manual filter cleaning mechanism.

[0022] In some embodiments, the filter cleaning mechanism includes: a striker movable between a first striker position and a second striker position, in which the striker contacts the filter; a spring biasing the striker to the first striker position; and a solenoid. Activation of the solenoid moves the striker to the second striker position so that the striker impacts the filter.

[0023] In some embodiments, the filter cleaning mechanism further includes an anvil disposed between the impact member and the filter. The anvil can rotate between a first anvil position and a second anvil position, in which the anvil is spaced from the filter and in which the anvil contacts the filter. The torsion spring biases the anvil to the first anvil position. The activation of the solenoid moves the impact member to the second impact member position, so that the impact member rotates the anvil and the anvil impacts the filter.

[0024] In some embodiments, the dust container includes a latch located proximate to the handle section of the housing, the latch being operable by a user when grasping the handle.

[0025] In some embodiments, the handheld power tool includes a depth stop disposed on the housing.

[0026] In some embodiments, the handheld power tool includes a retractable on-bit suction tube.

[0027] In some embodiments, the handheld power tool includes a single fan for generating a motor cooling air flow and a suction air flow. The single fan is a dual axial flow fan with a radial exhaust port.

[0028] Other features and aspects of the present disclosure will become apparent by consideration of the following detailed description and accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 is a front perspective view of a rotary hammer including an integrated dust collection assembly according to one embodiment.

[0030] Figure 2 is a rear perspective view of a rotary hammer including an integrated dust collection assembly according to one embodiment.

[0031] Figure 3A yes Figure 1 First cross-sectional view of a rotary hammer.

[0032] Figure 3B yes Figure 1 A second cross-sectional view of the rotary hammer.

[0033] Figure 4 FIG. 3 is an enlarged cross-sectional view of the rotary weight.

[0034] Figure 5 is a schematic illustration of a rotary hammer including an integrated dust collection assembly according to another embodiment.

[0035] Figure 6 is a schematic illustration of a rotary hammer including an integrated dust collection assembly according to yet another embodiment.

[0036] Figure 7 is a schematic illustration of a rotary hammer including an integrated dust collection assembly according to yet another embodiment.

[0037] Figure 8 is a schematic illustration of a rotary hammer including an integrated dust collection assembly according to yet another embodiment.

[0038] Fig. 9 is a schematic illustration of a rotary hammer including an integrated dust collection assembly according to yet another embodiment.

[0039] Fig.10 is a schematic illustration of a rotary hammer including an integrated dust collection assembly according to yet another embodiment.

[0040] Fig.11 is a schematic illustration of a rotary hammer including an integrated dust collection assembly according to yet another embodiment.

[0041] Fig.12 is a schematic illustration of a rotary hammer including an integrated dust collection assembly according to yet another embodiment.

[0042] Fig.13 is a schematic illustration of a rotary hammer including an integrated dust collection assembly according to yet another embodiment.

[0043] Fig.14 is a cross-sectional view of a rotary hammer including an integrated dust collection assembly according to yet another embodiment.

[0044] Fig.15 is a side view of a rotary hammer including an integrated dust collection assembly according to yet another embodiment.

[0045] Fig.16 yes Fig.15 Side view of a rotary hammer with some parts of the rotary hammer hidden for clarity.

[0046] Fig.17 yes Fig.15 A detailed view of a portion of the rotary hammer, showing the motor and fan.

[0047] Fig.18 yes Fig.15 Side view of a rotary hammer with some parts of the rotary hammer hidden for clarity.

[0048] Fig.19 is a first perspective view of a rotary hammer including an integrated dust collection assembly according to yet another embodiment.

[0049] Fig. 20 yes Fig.19 A second perspective view of the rotary hammer is shown.

[0050] Fig.21 yes Fig. 20 Cross-sectional view of a rotary hammer.

[0051] Fig. 22 is a detailed view of the drive unit and dust collection assembly as seen from the first side.

[0052] Fig.23 is a detailed view of the drive unit and dust collection assembly from the second side.

[0053] Fig.24 is a detailed view of the dust duct.

[0054] Fig.25 is a detailed view of a portion of the dust transfer tube.

[0055] Fig.26 is a detailed view of the connection between the dust tube and the nose of the rotary hammer.

[0056] Fig. 27 is a detailed view of a fan according to one embodiment.

[0057] Fig.28 is a detailed view of a fan and filter cleaning mechanism according to one embodiment.

[0058] Fig.29 is an auxiliary handle according to one embodiment.

[0059] Fig.30 A detailed view of a portion of the assist handle.

[0060] Fig.31 is a detailed view of the connection between the auxiliary handle and the rotary hammer.

[0061] Before explaining any embodiments of the present disclosure in detail, it should be understood that the application of the present disclosure is not limited to the details of the construction and arrangement of the components set forth in the following description or shown in the following figures. The present disclosure can have other embodiments and can be practiced or performed in various ways. In addition, it should be understood that the words and terms used herein are for descriptive purposes and should not be considered restrictive. DETAILED DESCRIPTION

[0062] When operating the tool, a power tool (such as a rotary hammer) can generate a large amount of dust and debris. Accordingly, a dust extractor or dust collection system has been implemented to try to capture dust, rather than allowing dust to be discharged into the air or inhaled by the user. Existing dust collection systems are generally completely separate tools that can be used in combination with power tools. For example, some dust collection systems are contained in a separate tool housing and can be connected to the housing of the power tool. Other dust collection systems utilize separate shop vacuums and dust channels to collect dust. Current dust collection systems may be bulky, clumsy or heavy when connected to a power tool. Similarly, a dust collection system utilizing a separate shop vacuum may limit the mobility and manipulability of a power tool due to the fact that the power tool is subject to the constraints of a shop vacuum. In addition, because existing dust collection devices are usually implemented as independent tools, the entire tool system may be more expensive due to the fact that duplicate components may be included in the power tool and the dust collection system. For example, a power tool and a dust collection system may each have their own battery, motor, fan, controller, housing, etc.

[0063] The present disclosure addresses some of these problems and also provides a series of other improvements that can be implemented to one or both of a power tool and / or a dust collection assembly. The present disclosure provides a power tool having an integrated dust collection assembly contained in the power tool. As used in the present disclosure, the integration of the dust collection assembly is intended to mean that at least some of the components of the dust collection assembly cannot be removed from the power tool and / or are integrated in the same housing with the power tool. Some components of the dust collection assembly (such as a suction pipe and / or a dust container) can be removably connected to the power tool, while other components (such as a fan and / or a fan motor) are not intended to be removed from the power tool. In addition, the integration of the dust collection assembly into the power tool can make at least some of these components be utilized in a shared manner between the power tool and the dust collection assembly. However, this does not require that all components be shared. Some components of the dust collection assembly can be separated from the power tool or can be repeated with the components in the power tool.

[0064] Integrating the dust collection assembly into the power tool can provide many different benefits. For example, integrating the dust collection assembly into the power tool can allow for a reduction in the number of components used for the operation of the power tool and the dust collection assembly. This in turn can reduce the overall cost of the system. In addition, in some embodiments, the reduction in components can also reduce the overall weight and size of the system. Likewise, in some embodiments, the profile of the tool system is more compact, which can allow the user to more easily manipulate and hold the tool system.

[0065] As will be appreciated by those of ordinary skill in the art, although the present disclosure is described with respect to a rotary hammer, the features described herein may be applied to other handheld power tools that generate dust when operated. For example, in some embodiments, the present disclosure may be applied to other types of power tools, such as drills, grinders, polishers, sanders, cutting tools, or other power tools that generate dust.

[0066] Figure 1 and Figure 2A power tool according to one embodiment is shown, such as a rotary hammer 4. The rotary hammer 4 shown includes a dust collection assembly 8 integrated into the tool body. In other embodiments, one or more parts of the dust collection assembly 8 can be implemented as an element separated from the rotary hammer 4 or can be located outside the rotary hammer 4. As will be understood based on the present disclosure, the integration of the dust collection assembly 8 in the rotary hammer 4 can allow the number of components for the operation of the rotary hammer 4 and the dust collection assembly 8 to be reduced. For example, in some embodiments, the dust collection assembly 8 and the rotary hammer 4 can share certain components. In some embodiments, this can reduce the overall cost of the system. Similarly, in some embodiments, this can reduce the overall weight and size of the system. Similarly, in some embodiments, the profile of the tool system is more compact, which can allow the user to more easily manipulate and hold the tool system. It should be understood that the various features and embodiments described in the present disclosure can be mixed together or interchanged into different combinations of features and embodiments. In other words, the specific combination of features disclosed herein is not intended to be restrictive, but purely to illustrate an example embodiment of various features including the entire disclosure.

[0067] The rotary hammer 4 includes a housing 12 having a body 16 and a handle 20 extending rearwardly of the body 16. The body 16 includes a first end 24 to which a tool bit 32 may be coupled and a second end 28 from which the handle 20 extends. The tool bit 32 may be received within a chuck assembly 36 formed in the first end 24 of the body 16. In addition, a suction tube 40 is slidably engaged with the first end 24 of the body 16. Figure 3A and Figure 3B As shown, housing 12 can be divided into quadrants defined by upper half, lower half, front half and rear half. In the embodiment shown, the upper half starts above the suction pipe 40 of dust collection assembly 8. In addition, in the embodiment shown, the front half starts from the first end 24 of housing 12 and extends to the midpoint between the first end 24 of main body 16 and the rear end of handle 20. Accordingly, this provides upper front quadrant (UFQ), upper rear quadrant (URQ), lower front quadrant (LFQ) and lower rear quadrant (LRQ). However, in other embodiments, quadrants can be defined by different divisions.

[0068] The drive unit 44 is positioned within the body 16 of the housing 12. The drive unit 44 includes a motor 48 and a drive assembly 52 that is operably coupled to the motor 48 to receive torque from the motor 48. The motor 48 defines a motor axis A1 that is parallel to the working axis A2 of the rotary hammer 4. The working axis A2 of the rotary hammer 4 is defined as an axis passing through the tool bit 32 and the drive assembly 52. ​​Power for the motor 48 is provided by a battery 56 that can be received in a battery receiving portion 60 on the bottom of the handle 20. However, in other embodiments, the battery receiving portion 60 can be provided in other portions of the housing 12.

[0069] The cooling fan 64 is operably coupled to the motor 48 and shares a rotation axis with the motor axis A1. The motor 48 thereby drives both the drive assembly 52 and the cooling fan 64. In the illustrated embodiment, the cooling fan 64 is positioned at the front side of the motor 48, between the chuck 36 and the motor 48. In another embodiment, the cooling fan 64 is operably coupled to the motor 48 and positioned below the drive unit 44. As will be described in further detail herein, the cooling fan 64 draws air along an air flow path extending through the motor 48 to cool the motor 48. More specifically, the cooling fan 64 draws air via a cooling air inlet 68 disposed in the housing 12 on the rear side of the motor 48, and discharges air via a cooling air exhaust port 72 disposed in the housing 12 on the front side of the motor 48.

[0070] In the illustrated embodiment, the drive unit 44 and the cooling fan 64 are positioned in the upper half of the housing 12. Accordingly, the drive unit 44 and the cooling fan 64 are positioned above the suction pipe 40. Further, the drive unit 44 and the cooling fan 64 are positioned in the front half of the housing 12. The arrangement of the drive unit 44 and the cooling fan 64 in the upper front quadrant provides additional space for the dust collection assembly 8. For example, the drive unit 44 does not extend (or only extends minimally) into the upper rear quadrant. Accordingly, there is space between the drive unit 44 and the second end 28 of the main body 16. Similarly, the drive unit 44 does not extend (or only extends minimally) into the lower front quadrant and the lower rear quadrant, thereby leaving enough space for the dust collection assembly 8.

[0071] The rotary hammer 4 also includes a dust collection assembly 8. In the illustrated embodiment, the dust collection assembly 8 is integrated into the body 16 of the rotary hammer 4. However, in other embodiments, one or more portions of the dust collection assembly 8 may be disposed within the handle 20 of the rotary hammer 4 or may be located outside of the housing 12. FIG. 3A to FIG. 3B, the dust collection assembly 8 includes a nozzle 76, a telescopic suction tube 40, a dust container 84, a filter 88, and a suction fan 92. The nozzle 76 is positioned at a first end of the telescopic suction tube 40 and near the tool bit 32 of the rotary hammer 4, so that the tool bit 32 extends through the nozzle 76. The second end of the telescopic suction tube 40 extends into the housing 12, so that the suction tube 40 extends and retracts from the first end 24 of the body 16.

[0072] The dust container 84 is selectively attachable to the housing 12. The dust container 84 is detachable from the housing 12 of the rotary hammer 4 and can be removed to allow an operator to empty dust and other debris from the dust container 84. A latch 96 operable by a user to selectively decouple the dust container 84 from the housing 12 is positioned on the housing 12 proximate the handle 20. Figure 2 In the embodiment of the present invention, the latch 96 is positioned close to the bottom edge of the housing 12. In another embodiment, as shown in FIG. Fig.14 As shown, the latch 96 can be positioned on the second end 28 of the housing 12 so that the latch faces the handle 20 and is positioned to be operated by the user when the user grasps the handle 20. In the illustrated embodiment, the latch 96 is positioned opposite to the trigger switch 98 that selectively operates the rotary hammer 4. In the illustrated embodiment, the dust container 84 is prevented from being fixed to the housing 12 when the filter 88 is not in place. For example, the filter 88 acts as a part of the connection between the dust container 84 and the housing 12. Thus, the dust container 84 is prevented from being connected to the housing 12 when the filter 88 is not in place.

[0073] The dust container 84 is substantially received within the body 16 of the housing 12 when coupled to the rotary hammer 4, such that the dust container does not extend (or only minimally extends) to the exterior of the housing 12 when coupled to the housing 12. However, in other embodiments, the dust container 84 may only be partially received within the housing 12 or may be attached to an exterior portion of the housing 12. In the illustrated embodiment, the dust container 84 extends along the width of the bottom of the body 16. In addition, the dust container 84 extends into the upper rear quadrant and into the space between the drive unit 44 and the second end 28 of the body 16.

[0074] The dust container 84 includes an inlet 100 for dust-laden air flow and an outlet 104 defined by the outlet end of the filter 88. More specifically, the dust container 84 includes opposite side walls 108 and a bottom wall 112 extending between the side walls 108. In addition, the dust container 84 includes an end wall 116 adjacent to each of the side walls 108 and the bottom wall 112. An opening 120 is defined in the first end wall 116, through which the filter 88 is received. The first end wall 116 further includes an inlet 100 for dust-laden air. A connection port 124 extends through the inlet 100 to guide dust-laden air from the suction pipe 40 into the dust container 84. In some embodiments, the connection port 124 is a DEC 26 connection. The dust container 84 is operable to collect dust and other debris from the workpiece during the drilling and / or hammering operation performed by the rotary hammer 4 to maintain the user's work area substantially free of dust and other debris.

[0075] As mentioned, the dust container 84 extends upward into the housing 12 of the rotary hammer 4 between the motor 48 and the handle 20. The filter 88 is positioned within the dust container 84 in a section of the dust container 84 that extends between the motor 48 and the second end 28 of the body 16 (i.e., the upper rear quadrant). In other embodiments, the filter 88 may be positioned in other sections of the dust container 84. In some embodiments, the filter 88 is a high efficiency particulate air ("HEPA") filter positioned between the dust container 84 and the suction fan 92.

[0076] Suction fan 92 is positioned behind motor 48, adjacent to filter 88, to inhale dusty air through filter 88. Suction fan 92 is directly mounted to output shaft 94 of motor 48 and shares a rotation axis with motor axis A1. However, in some embodiments, suction fan 92 is operably connected to motor 48 via other mechanical devices such as clutch, belt or power output device. As shown in Figure 3, motor 48, suction fan 92 and filter 88 are positioned in the upper half of housing 12. More specifically, filter 88 is arranged in a row with suction fan 92, motor 48, cooling fan 64 and drive unit 44. Axis A3 passing through the center of filter 88 intersects with rotation axis A1 of suction fan 92 at an obtuse angle. In the embodiment shown, axis A3 passing through filter 88 is defined as extending vertically from the surface of filter 88 facing suction fan 92. The tilted orientation of filter 88 reduces the total length of rotary hammer 4 measured from the rearmost point on handle 20 of housing 12 to the frontmost point on nozzle 76 of dust collection assembly 8. The obtuse angle of the filter 88 can improve the vertical upward operation of the rotary hammer 4. In addition, the obtuse angle of the filter 88 can provide an improved sealing surface between the dust container 84 and the filter 88.

[0077] The suction fan 92 generates an airflow when rotated by the motor 48, which creates a vacuum in the suction duct 40 to draw dust and other debris into the dust container 84 and through the filter 88. After the dust is separated from the air via the filter 88, the clean air is discharged through the discharge port 128 formed in the housing 12 adjacent to the suction fan 92. Figure 1 As shown, the exhaust port 128 is positioned rearwardly of the motor 48 and adjacent to the suction fan 92 .

[0078] Continue to refer FIG. 3A to FIG. 3B , the suction tube 40 extends longitudinally in a direction parallel to the working axis A2 within the housing of the rotary hammer 4. The suction tube 40 is configured to move along the same longitudinal axis to adjust the length of the suction tube 40 and the position of the nozzle 76. When the tool bit 32 is inserted into the workpiece, the suction tube 40 is retracted into the housing 12 in a telescopic manner. An insertion depth stop 132 is included within the rotary hammer housing 12, which limits the extent to which the suction tube 40 can be retracted into the housing 12, and in turn limits the extent to which the tool bit 32 can be inserted into the workpiece. The insertion depth stop 132 is movable along the length of the suction tube 40 and selectively fixed to limit the extent to which the suction tube 40 can be retracted into the housing 12. An extension stop 136 is also included on the housing 12. The extension stop 136 limits the extent to which the suction tube 40 can be extended out of the housing 12 by being selectively fixed to the suction tube 40 along the length of the suction tube 40. This feature can be used to adjust the extended length of the suction tube 40 to correspond to the size of the tool bit 32 used. For example, when a 2-inch tool bit is used, the extended length of the suction tube 40 can be reduced to 2 inches to correspond to the length of the tool bit 32. If the length of the suction tube 40 is not limited, the end of the suction tube 40 can extend far beyond the end of the tool bit 32.

[0079] The transfer tube 140 is connected to the suction tube 40. The transfer tube 140 is fixed relative to the housing 12 and serves as a connection between the suction tube 40 and the dust container 84. The first end of the transfer tube 140 near the dust container 84 has a bend between 0 degrees and 90 degrees. The connection port 124 is connected to the first end of the transfer tube 140 to facilitate connection with the dust container 84. In some embodiments, the connection port 124 can be a DEC 26 port. The bend in the transfer tube 140 and the connection port 124 can provide an improved seal between the transfer tube 140 and the dust container 84. In addition, the connection port 124 allows the user to remove the dust container 84, the purpose is to empty the dust container 84, without being exposed to the dust in the dust container 84.

[0080] refer to Figure 3A and Figure 4, the filter cleaning mechanism 148 is disposed in the housing 12 and is positioned near the frontmost edge of the filter 88. In other embodiments, the filter cleaning mechanism 148 can be positioned near any edge of the filter 88. The filter cleaning mechanism 148 includes an anvil 152 for impacting the filter 88, a striker 156 for impacting the anvil 152, a solenoid 160 for causing the striker 156 to impact the anvil 152, and a biasing member 164 for biasing the striker 156. The anvil 152 is positioned near the filter 88 and is coupled to the housing 12 around an anvil axis A4. The anvil 152 rotates around the anvil axis A4 to move between a first anvil position spaced from the filter 88 and a second anvil position contacting the impact position on the filter 88. The striker 156 has a longitudinal axis A5 parallel to the working axis A2 of the rotary hammer 4, and the striker 156 moves between the first striker position and the second striker position along the longitudinal axis. In the first impact member position, the impact member 156 contacts the anvil 152 in the first anvil position. In other embodiments, the impact member 156 can be spaced apart from the anvil 152 when in the first impact member position. In the second impact member position, the impact member 156 contacts the anvil 152 so that the anvil 152 rotates to the second anvil position and contacts the filter 88 in the impact position. In some embodiments, the filter cleaning mechanism 148 does not include the anvil 152. Instead, the impact member 156 directly impacts the filter 88 when in the second impact member position. The solenoid 160 is supported by the housing 12 and surrounds at least a portion of the impact member 156. The biasing member 164 is positioned on the opposite end of the impact member 156 and the solenoid 160 relative to the anvil 152 and the filter 88. In the illustrated embodiment, the biasing member 164 is a compression spring. The biasing member 164 biases the striker 156 toward the first striker position until the solenoid 160 is activated, at which time the solenoid 160 overcomes the biasing member 164 and moves the striker 156 to the second striker position. Fig.14 In the embodiment of FIG. 1 , a second biasing member 166 , shown as a torsion spring, is coupled to the anvil 152 to bias the anvil 152 to the first anvil position.

[0081] The filter cleaning mechanism 148 operates as follows. In one embodiment, the filter cleaning mechanism 148 is automatically actuated when the suction fan 92 is not operating. A controller (not shown) controls the activation of the solenoid 160 to move the impact member 156. Triggering the solenoid 160 can be based on detecting that the suction fan 92 is not operating or the motor 48 is not operating. As used herein, the suction fan 92 can be considered to be inoperative when it has stopped rotating, or when the suction fan 92 is rotating at a speed below a predetermined threshold when the air flow caused by the suction fan 92 has effectively stopped. Similarly, the motor 48 can be considered to be inoperative when it has stopped rotating, or when the motor operates at a speed below a predetermined speed threshold. In another embodiment, the filter cleaning mechanism 148 can be actuated when the suction fan 92 or the motor 48 is operating. In the illustrated embodiment, an actuator (such as a button 168) is disposed on the exterior of the housing 12 and allows a user to manually activate the filter cleaning mechanism 148 ( Figure 1 ). Button 168 allows the operator to clean filter 88 at will or at an intermediate time between automatic cleaning operations.

[0082] In the static state, the anvil 152 is in the first anvil position, the impact piece 156 is in the first impact piece position, and the solenoid 160 is not energized. In order to start the operating state, the solenoid 160 must be energized automatically or by the button 168. Once the solenoid 160 is energized, it overcomes the biasing member 164, so that the impact piece 156 moves from the first impact piece position to the second impact piece position. Once the impact piece 156 is in the second impact piece position, it impacts the anvil 152, so that the anvil 152 moves from the first anvil position to the second anvil position and impacts the filter 88 in the impact position. The impact of the anvil 152 on the filter 88 drives dust and other debris from the filter 88. After the anvil 152 impacts the filter 88, the solenoid 160 is automatically deactivated, thereby allowing the anvil 152 and the impact piece 156 to return to the first anvil position and the first impact piece position, respectively.

[0083] Figures 1 to 4The rotary hammer 4 of the embodiment of the present invention utilizes a single power source (e.g., battery 56) and a single electric motor 48 to operate the drive assembly 52 and the dust collection assembly 8. The portion of the dust collection assembly 8 integrated with the housing 12 can allow for an improved component layout for vertical upward operation. Two different air flow paths are specified in the housing 12. The first air flow path is a dust collector flow path, in which dust-laden air enters through the suction air inlet in the nozzle 76, travels through the suction pipe 40, enters the transfer pipe 140, and deposits dust into the dust container 84 with the help of the filter 88. After passing through the dust container 84 and the filter 88, the now clean air leaves the housing 12 through the suction air exhaust port 128. The airflow in the dust collector flow path is driven by the suction fan 92 and the motor 48. The second air flow path is characterized as a cooling air flow path. The cooling air flow path includes a cooling air inlet 68 on the housing 12 and a cooling air exhaust port 72 located on the housing 12 and spaced apart from the cooling air inlet 68. Air in the cooling air flow path enters through cooling air intake 68, is directed across motor 48 to cool motor 48 and exits through cooling air exhaust 72. The cooling air path is powered by cooling fan 64, which is mounted coaxially on motor 48 with extraction fan 92.

[0084] Figure 5 Another embodiment of a rotary hammer 4b having an integrated dust collection assembly 8b is shown, wherein like parts have like reference numerals plus the letter "b" with the following differences explained below. Figure 5 In the illustrated embodiment, the motor axis A1b of this embodiment is perpendicular to the drive assembly 52b and the working axis A2b. The dust container 84b is selectively coupled to the housing 12b, on the lower front portion below the drive assembly 52b. The orientation of this embodiment can improve vertical downward operation and achieve a reduced length rotary hammer 4b.

[0085] Figure 6 Another embodiment of a rotary hammer 4c with an integrated dust collection assembly 8c is shown, wherein similar parts have similar reference numerals plus the letter "c" and the following differences explained below. Housing 12c includes a lower housing portion designed to dock with dust container 84c. A single fan 172 driven by motor 48c provides suction for dust collector air flow and cooling air flow. The rotary hammer 4c of this embodiment can improve horizontal drilling. Advantageously, this embodiment only has a single fan 172 for cooling the motor and driving the dust extractor.

[0086] Figure 7Yet another embodiment of a rotary hammer 4d having an integrated dust collection assembly 8d is shown, wherein like components have like reference numerals plus the letter "d" and the following differences explained below. A single fan 172d positioned axially within the housing 12d between the motor 48d and the drive assembly 52d provides suction for both the dust collector air flow and the cooling air flow. The arrangement of the dust collection assembly 8d components (i.e., the filter 88d, dust container 84d, transfer tube 140d, suction tube 40d, and nozzle 76d) is similar to that of the embodiment of the present invention. Figures 1 to 4 The embodiment of remains unchanged. This orientation enables the rotary hammer 4d to have an improved vertical upward operation.

[0087] Figure 8 Yet another embodiment of a rotary hammer 4e with an integrated dust collection assembly 8e is shown, wherein like components have like reference numerals plus the letter "e" and the following differences explained below. A second transfer tube 176 is positioned between the filter 88e and the suction tube 40e. In addition, the filter axis A3e is oriented perpendicular to the motor axis A1e. This housing 12e orientation allows for a reduced tool height and an increased tool length. The tool orientation of this embodiment can improve horizontal operation.

[0088] Fig. 9 Yet another embodiment of a rotary hammer 4f with an integrated dust collection assembly 8f is shown, with like parts having like reference numerals plus the letter "f" and the following differences explained below. The suction tube 40f is positioned horizontally beside the drive assembly 52f. This allows the tool height to be shorter and optimizes horizontal drilling.

[0089] Fig.10 Another embodiment of a rotary hammer 4g with an integrated dust collection assembly 8g is shown, wherein similar components have similar reference numerals plus the letter "g" and the following differences explained below. The suction fan 92g is positioned on a suction fan drive shaft 180, separate from the motor 48g. The suction fan drive shaft 180 is parallel to the motor axis A1g. A belt or chain 184 couples the suction fan drive shaft 180 to the motor 48g and allows the motor 48g to drive the suction fan 92g. Advantageously, the suction drive of this embodiment allows the motor 48g and the suction fan 92g to have different speeds.

[0090] Fig.11 Yet another embodiment of a rotary hammer 4h with an integrated dust collection assembly 8h is shown, with like components having like reference numerals plus the letter "h" and the following differences explained below: A suction fan 92h is oriented perpendicular to the motor axis A1h and is driven by a bevel gear train 188 .

[0091] Fig.12Yet another embodiment of a rotary hammer 4i having an integrated dust collection assembly 8i is shown, wherein like parts have like reference numerals plus the letter "i" and the following differences explained below. The orientation of the dust collection assembly 8i is similar to Figure 6 however, the suction fan 92i is oriented perpendicular to the motor axis A1i and is driven by a bevel gear train 188i.

[0092] Fig.13 Yet another embodiment of a rotary hammer 4j with an integrated dust collection assembly 8j is shown, wherein like parts have like reference numerals plus the letter "j" and the following differences explained below. A second motor 192 is disposed within the housing 12j to drive the suction fan 92j of the dust collection assembly 8j. Advantageously, this embodiment allows the speed of the dust collection assembly 8j and the speed of the drive assembly 52j to be independently controlled. In this embodiment, the dust collection assembly 8j is operable even when the drive assembly 52j is not engaged.

[0093] Figures 15 to 18 Yet another embodiment of a rotary hammer 4k having an integrated dust collection assembly 8k is shown, wherein like components have like reference numerals plus the letter "k" with the following differences explained below. Fig.15 The rotary hammer 4k includes a housing 12k having a body 16k and a handle 20k extending rearwardly of the body 16k. Fig.16 , the motor 48k, the drive assembly 52k and the fan 200 are arranged in the main body 16k. Each of the drive assembly 52k and the fan 200 is operably connected to the motor 48k to receive the torque from the motor 48k. The motor 48k is oriented in the main body 16k to be non-parallel to the working axis A2 of the rotary hammer 4k. In particular, the motor 48k is oriented so that the motor axis A1 defined as the rotation axis of the motor 48k is transverse to the working axis A2 of the rotary hammer 4k. In some embodiments, the motor 48k can be oriented so that the motor axis A1 is oriented vertically and perpendicular to the working axis A2. The main body 16k of the rotary hammer 4k supports the dust container 84k at the lower half, so that the motor 48k, the fan 200 and the dust container 84k are aligned along the motor axis A1, wherein the fan 200 is arranged between the motor 48k and the dust container 84k.

[0094] refer to Fig.17 , the fan 200 is a dual-axis fan. The torque from the motor 48k causes the fan 200 to rotate, and the fan rotation draws air toward the fan 200. In the illustrated embodiment, air enters the fan 200 from two opposite directions along the rotation axis A1 of the fan 200, as shown in FIG. Fig.17. Specifically, the first air flow enters the fan 200 from the top side of the fan 200, and the second air flow enters the fan 200 from the bottom side of the fan 200. Once the air reaches the fan 200, the air is guided radially outward from the fan 200 to be discharged. In particular, the fan 200 draws cooling air into the rotary hammer 4K through an opening in the housing of the rotary hammer 4K. Then, the cooling air flow is sucked through the motor 48k to cool the motor 48K. The fan 200 can further draw the cooling air through the controller 205 to cool the controller 205. After passing through one or both of the motor 48K and the controller 205, the cooling air flow enters the fan 200 from the top side of the fan 200.

[0095] The fan 200 also generates a suction air flow, wherein the air is directed through the dust collection assembly 8k toward the fan 200 in the opposite direction of the cooling air flow, and then radially directed out of the exhaust port 204. The rotation of the fan 200 simultaneously generates a motor cooling air flow and a suction air flow. In some embodiments, the cooling air flow and the dust extraction air flow can be two separate air flows, which are isolated from each other until they merge in the fan 200 and are discharged together as a merged air flow stream. In some embodiments, the cooling air flow is directed through other components (e.g., circuit boards) of the rotary hammer 4k to cool these components as well. As will be described in more detail later, the suction air flow draws dust and / or debris into the dust container.

[0096] refer to Figures 15 to 18 , the dust collection assembly 8k includes a retractable suction tube 208 in place of the telescopic suction tube 40. The retractable suction tube 208 is configured to be selectively coupled to the housing 12k of the rotary hammer 4k and surround the tool bit 32k. In other words, the dust collection assembly 8k utilizes the on-bit suction tube 208. In the illustrated embodiment, the retractable suction tube 208 is secured to the housing 12k via a snap fit. However, a person of ordinary skill in the art will appreciate that other securing methods (such as threaded connections or latch connections) perform the same function as the snap fit and may be used in place of the snap fit. Reference Fig.19 , the retractable suction tube 208 includes a biasing member 212, shown as a spring, which is configured to bias the suction tube 208 to an extended state. When the tool bit 32k is inserted into the workpiece, the front end 216 of the suction tube 208 will engage the workpiece. Further insertion of the tool bit 32k into the workpiece causes the suction tube 208 to retract or collapse against the force of the spring 212, while the front end 216 maintains contact with the workpiece. The entirety of the retractable suction tube 208 remains outside the housing 12k of the rotary hammer 4k even when retracted, thereby creating more space for other components of the rotary hammer 4k within the housing 12k without increasing the overall size of the housing 12k.

[0097] In some embodiments, the retractable suction tube 208 further includes a locking mechanism 220, shown as a hook, to selectively secure the retractable suction tube 208 in the retracted state. When retracted, the hook 220 engages a corresponding lock on the housing 12k to counteract the force from the bias spring 212. Securing the suction tube 208 in the retracted state allows the tool bit 32k to be easily replaced without removing the retractable suction tube 208 from the housing 12k.

[0098] When the retractable suction tube 208 is fixed to the housing 12k, an uninterrupted fluid path is formed between the opening in the front end 216 of the suction tube 208 and the fan 200. Therefore, the suction air flow draws dust and / or debris generated by the tool bit 32k through the retractable suction tube 208 into the dust container 84k, and then the air combines with the motor cooling air flow to be discharged through the exhaust port 204.

[0099] Figures 19 to 21 A power tool according to another embodiment of the present disclosure is shown, such as a rotary hammer 1004. The rotary hammer 1004 shown includes a dust collection assembly 1008 integrated into the tool body. In some embodiments, one or more portions of the dust collection assembly 1008 may be implemented as separate components from the rotary hammer 1004 or may be located external to the rotary hammer 1004.

[0100] The rotary hammer 1004 includes a housing 1012 having a body 1016 and a handle 1020 extending rearwardly of the body 1016. The body 1016 includes a first end 1024 to which a tool attachment may be coupled and a second end 1028 from which the handle 1020 extends. The tool attachment may be, for example, a tool bit 1032, a polisher, a sander, a grinder, a cutter, or any other attachment intended to operate on a work surface that may result in the discharge of dust during machining operations of the rotary hammer 1004. The tool bit 1032 may be received within a chuck assembly 1036 formed in the first end 1024 of the body 1016. The tool bit 1032 defines a working axis A2 ( Fig.21 ). The handle 1020 includes a trigger 1098 adapted to actuate the rotary hammer 1004. In the illustrated embodiment, the trigger 1098 is disposed on the handle 1020 at a position proximate to the working axis A2 of the rotary hammer 1004. In other words, the trigger 1098 is proximate to or along the working axis A2 of the rotary hammer 1004 along the vertical position of the handle 1020 (i.e., the vertical direction as shown in the figure). This allows the trigger 1098 to be generally aligned with the tool bit 1032 so that the user's finger is also aligned with the tool bit 1032.

[0101] In some embodiments, the rotary hammer 1004 can be equipped with an auxiliary handle 1300 that is selectively coupled to the rear of the handle 1020. The auxiliary handle 1300 can help the user control the rotary hammer 1004, particularly when the user is engaged in overhead drilling or when at an awkward angle relative to the work surface. For example, the auxiliary handle 1300 can be used as an extension arm that allows the user to reach farther while still being able to hold and support the rotary hammer 1004. On the other hand, the auxiliary handle 1300 also allows the user to hold the rotary hammer 1004 closer to the user's body, so that the user does not have to extend his / her arm so far. Holding the rotary hammer 1004 closer to the user's body provides a more reliable and stable support for the rotary hammer 1004. In addition, like the trigger 1098, the auxiliary handle 1300 is aligned approximately along the working axis A2 of the rotary hammer 1004. This arrangement provides better aiming and control of the working axis A2 from one end of the rotary hammer 1004 to the other end. In other words, the user has greater control and stability over the orientation of the working axis A2 and can more easily adjust and / or maintain the angle of the working axis A2 relative to the work surface.

[0102] Figure 29 to Figure 31 A detailed view of the auxiliary handle 1300 is provided. The auxiliary handle 1300 includes a curved grip 1330 that allows a user to grasp the grip 1330 in the palm of the user's hand and hold it with the user's fingers toward the front of the grip. This style of grip allows the user to hold the auxiliary handle 1300 directly from behind to help support the weight of the rotary hammer 1004 when drilling upward. Additionally, because the user can hold the curved grip 1330 directly from behind, it is also easier to manipulate the rotary hammer without twisting or twisting their wrist. The auxiliary handle 1300 shown includes a telescopic body having a first axis 1308 and a second axis 1312 that can slide within the first axis 1308. Accordingly, the telescopic body allows the auxiliary handle 1300 to be extended to different lengths. For example, Fig.19 The auxiliary handle 1300 is shown in a fully extended position, and Fig. 20 The assist handle 1300 is shown in a retracted state. However, the assist handle 1300 can be extended to a plurality of different lengths between the fully extended state and the retracted state. Specifically, the first shaft 1308 and the second shaft 1312 include fixing holes 1316 that allow the fixing pin 1320 to fix the second shaft 1312 relative to the first shaft 1308 when aligned. This helps maintain the assist handle 1300 at a desired length.

[0103] In addition, the auxiliary handle 1300 can be rotated to a stowed position when not in use. For example, the auxiliary handle 1300 can be rotated toward the top of the rotary hammer 1004 (in Fig.19 1020) and retract along the top surface of the body 1016. Alternatively, the auxiliary handle can be rotated toward the rear end of the handle 1020 (in the Fig.19 The auxiliary handle 1300 can be rotated in a clockwise direction (in the embodiment of FIG. 1 ) and stowed along the length of the handle. This can be achieved by a rotation lock 1324 that selectively couples the auxiliary handle 1300 to the rotary hammer 1004 in various orientations. Specifically, the rotation lock 1324 both releasably couples the auxiliary handle 1300 to the rear end of the rotary hammer 1004 and maintains the auxiliary handle 1300 in different orientations relative to the rotary hammer 1004. The rotation lock 1324 can include a hinge that allows the auxiliary handle 1300 to rotate relative to the rotary hammer 1004. In addition, the auxiliary handle 1300 can be completely removed from the rotary hammer 1004.

[0104] refer to Fig.21 , the housing 1012 can be divided into quadrants defined by an upper half, a lower half, a front half, and a rear half. In the illustrated embodiment, the upper half begins near the electric motor 1048. In addition, in the illustrated embodiment, the front half begins at the first end 1024 of the housing 1012 and extends to the midpoint between the first end 1024 of the body 1016 and the rear end of the handle 1020. Accordingly, this provides an upper front quadrant (UFQ), an upper rear quadrant (URQ), a lower front quadrant (LFQ), and a lower rear quadrant (LRQ). In the illustrated embodiment, the center of mass CM of the tool is positioned near the intersection of the upper front quadrant (UFQ), the upper rear quadrant (URQ), the lower front quadrant (LFQ), and the lower rear quadrant (LRQ).

[0105] refer to Figure 21 to Figure 23, the drive unit 1044 is positioned in the body 1016 of the housing 1012. However, in other embodiments, one or more components of the drive unit 1044 can be positioned in the handle 1020. In the illustrated embodiment, the drive unit 1044 is mainly positioned in the upper half of the housing 1012. The arrangement of the drive unit 1044 provides additional space for the dust collection assembly 1008. The drive unit 1044 includes a motor 1048 and a drive assembly 1052, which is operably connected to the motor 1048 to receive torque from the motor 1048. The motor 1048 defines a motor axis A1 that is angled relative to the working axis A2 of the rotary hammer 1004. For example, in some embodiments, the angle between the motor axis A1 and the working axis A2 is between 80 degrees and 135 degrees. In some embodiments, the angle between the motor axis A1 and the working axis A2 is between 90 degrees and 115 degrees. In some embodiments, the angle is 105 degrees. In other embodiments, the angle is 90 degrees, so that the motor axis A1 extends perpendicular to the working axis A2. The working axis A2 of the rotary hammer 1004 is defined as the axis passing through the tool bit 1032 and the drive assembly 1052. In the illustrated embodiment, the motor 1048 is positioned near the center of mass CM. In some embodiments, the motor 1048 is positioned in the front half, near the center line between the upper and lower halves of the housing 1012.

[0106] Power for the motor 1048 is provided by a battery 1056, which may be received in a battery receptacle 1060 at the bottom of the handle 1020. In other embodiments, the battery receptacle 1060 may be disposed in other portions of the housing 1012. In some embodiments, the battery 1056 may be a removable, rechargeable battery.

[0107] The operation of the rotary hammer 1004 is controlled by a single controller 1205. The controller 1205 shown controls both the motor 1048 and the dust collection assembly 1008. However, in other embodiments, two or more controllers may be included in the rotary hammer 1004 to independently control the various components of the drive unit 1044 and the dust collection assembly 1008. The controller 1205 is positioned in the upper rear quadrant (URQ). In particular, the controller 1205 is positioned behind the drive assembly 1052 and above the motor 1048.

[0108] The fan 1200 is operably connected to the motor 1048 and shares a rotation axis with the motor axis A1. The motor 1048 thereby drives both the drive assembly 1052 and the fan 1200. In the illustrated embodiment, the fan 1200 is positioned below the motor 1048 and the drive assembly 1052. Therefore, in the illustrated embodiment, the fan 1200 is positioned below the center of mass of the rotary hammer 1004. As will be further described in detail herein, the fan 1200 draws air along a cooling air flow path extending through the motor 1048 to cool the motor 1048. In some embodiments, the cooling air flow path is guided through other components (e.g., controller 1205, circuit board) of the rotary hammer 1004 to cool these components as well. At the same time, the fan 1200 draws air along the suction air flow path to draw dust and / or debris into the dust collection assembly 1008. However, in other embodiments, two separate fans that generate cooling air flow and dust collection air flow may be present.

[0109] The rotary hammer 1004 also includes a dust collection assembly 1008. In the illustrated embodiment, the dust collection assembly 1008 is integrated into the body 1016 of the rotary hammer 1004. However, in other embodiments, one or more portions of the dust collection assembly 1008 may be located within the handle 1020 or outside of the housing 1012. The dust collection assembly 1008 includes a nozzle 1076, a dust tube 1040, a dust container 1084, a filter 1088, and a fan 1200.

[0110] like Fig.24 As shown, nozzle 1076 is positioned at first end 1040a of dust tube 1040. Nozzle 1076 and dust tube 1040 surround at least a portion of tool bit 1032 of rotary hammer 1004. In other words, dust collection assembly 1008 utilizes dust tube 1040 on drill bit. In addition, in the embodiment shown, dust tube 1040 is a retractable suction tube. In other words, dust tube 1040 is made of compressible material, which can expand and contract in an accordion-like manner. A spring such as spring 212 biases dust tube 1040 toward an expanded position. When tool bit 1032 is inserted into a workpiece, nozzle 1076 will engage the workpiece. Tool bit 1032 is further inserted into the workpiece so that dust tube 1040 contracts or folds against the force of spring 212, while nozzle 1076 maintains contact with the workpiece.

[0111] In some embodiments, a depth stop 1130 is coupled to the dust tube 1040 to limit the extent to which the tool bit 1032 can be inserted into the workpiece. The depth stop 1130 includes an insertion depth stop 1132 that limits the extent to which the dust tube 1040 can be retracted, and in turn limits the extent to which the tool bit 1032 can be inserted into the workpiece. The insertion depth stop 1132 is movable along the length of a ruler 1134 coupled to the dust tube 1040 and selectively fixed to limit the extent to which the dust tube 1040 can be retracted. An extension stop 1136 is also included. The extension stop 1136 limits the extent to which the dust tube 1040 can be extended by selectively fixing to the ruler 1134. This feature can be used to adjust the extension length of the dust tube 1040 to correspond to the size of the tool bit 1032 being used. Furthermore, in some embodiments, the aspiration tube 1040 may not include a depth stop 1130 at all or may include only one of an insertion depth stop 1132 or an extension stop 1136 .

[0112] In addition, in some embodiments, the dust tube 1040 may also be equipped with a locking mechanism 220 as shown in the previous embodiment to maintain the dust tube 1040 in a retracted state. However, in other embodiments, the dust tube 1040 may be a sliding suction tube or a telescopic suction tube (e.g., Figure 3A and Figure 3B In addition, in other embodiments, the dust tube 1040 can be arranged adjacent to the tool bit 1032, rather than being configured as an on-bit dust tube 1040. For example, the dust tube 1040 can be arranged above, below, or to the side of the tool bit 1032, with only the nozzle 1076 extending through the tool bit 1032.

[0113] Continue to refer Fig.24 , a first end of the dust tube 1040 is coupled to the nozzle 1076, and a second end 1040b of the dust tube 1040 is coupled to the housing 1012 of the rotary hammer 1004. In the illustrated embodiment, the second end 1040b of the dust tube 1040 is coupled to the housing 1012 via an external transfer tube 1140. The dust tube 1040 is secured to the nozzle 1076 and the external transfer tube 1140 by tabs 1050 that help hold and support the dust tube 1040 at each end. In turn, the external transfer tube 1140 is removably coupled to the housing 1012 via a combination of a snap fit and a swivel connection.

[0114] like Fig.25 As shown, the external transfer tube 1140 is first snap-fitted onto the first end 1024 of the housing 1012 and then rotated (e.g., Fig.25The external transfer tube 1140 is rotated clockwise in the center of the housing 1012 to secure the external transfer tube 1140 to the housing 1012. Specifically, the first end 1140a of the external transfer tube 1140 is snap-fitted onto the housing 1012, while the second end 1140b of the external transfer tube 1140 is rotated to a locked position. The first end 1140a of the external transfer tube 1140 forms a collar that can be snap-fitted onto the nose 1064 of the hammer 1004 via the snap ring 1054. The snap fit is achieved by linearly moving the external transfer tube 1140 until the snap ring 1054 axially locks the first end 1140a of the external transfer tube 1140 to the housing 1012. Once secured to the housing 1012, the first end 1140a of the external transfer tube 1140 (i.e., the collar) surrounds the circumference of the nose 1064, allowing the chuck assembly 1036 and / or the tool bit 1032 to extend through the opening in the first end 1140a of the external transfer tube 1140.

[0115] To rotationally lock the external transfer tube 1140, the external transfer tube 1140 is rotated until it reaches a locked position. To accomplish this, the first end 1140a of the external transfer tube 1140 includes one or more annular protrusions 1068 formed within the opening of the collar that are received within corresponding annular grooves 1070 on the nose 1064 of the hammer 1004 to facilitate rotational engagement between the external transfer tube and the hammer. The external transfer tube 1140 is rotated until the second end 1140b is received within an annular groove 1062 formed on the first end 1024 of the housing 1012. The annular groove 1062 prevents the external transfer tube 1140 from further rotating relative to the housing 1012. In addition, the annular groove 1062 helps align the second end 1140b of the external transfer tube 1140 with the opening in the housing 1012 that meets the internal transfer tube 1141. The outer transfer tube 1140 and the inner transfer tube 1141 together guide the dust-laden air from the dust tube 1040 to the dust container 1084. The second end 1140b of the outer transfer tube 1140 is fluidly coupled to the inner transfer tube 1141 to form an airtight connection. It should be understood by those of ordinary skill in the art that in alternative solutions, other fixing methods that perform the same functions as the snap-fit ​​and rotational connections may be used, such as threaded or latched connections.

[0116] like Fig.26As shown, the rotary hammer 1004 includes a brush seal 1224 disposed within the dust tube 1040 to prevent dust from entering the body 1016 via the chuck assembly 1036. In the illustrated embodiment, the brush seal 1224 is positioned proximate to the second end 1040b of the dust tube 1040 connected to the housing 1012. However, in other embodiments, the brush seal 1224 may be disposed in the bit holding area of ​​the housing 1012 rather than within the dust tube 1040. In yet another embodiment, the brush seal 1224 may be disposed proximate to the first end 1040a of the dust tube 1040. The illustrated brush seal 1224 surrounds and engages a portion of the tool bit 1032 to prevent dust and / or debris drawn into the dust tube 1040 from entering the housing 1012. The brush seal 1224 prevents dust displaced via the dust extractor airflow from entering through the nose 1064 of the tool and / or the bit holding assembly 1036. Instead, the air will flow through the dust duct 1040 , through the external transfer duct 1140 , through the internal transfer duct 1141 , and into the dust container 1084 without entering the chamber of the main body 1016 that houses the drive unit 1044 and the controller 1205 .

[0117] Refer to Figure 21 to Figure 23 , the external transfer duct 1140 extends from the dust duct 1040 to the housing 1012, and the internal transfer duct 1141 extends from the external transfer duct 1140 to the inlet 1100 of the dust container 1084. The external transfer duct 1140 and the internal transfer duct 1141 together form a dust transfer duct 1145. As discussed, the external transfer duct 1140 is selectively coupled to the dust duct 1040 and the nose 1064 of the rotary hammer 1004 to establish a suction air flow path for the dust extractor. The internal transfer duct 1141 extends from the upper portion to the lower portion along the first end 1024 of the body 1016, at which point the internal transfer duct is coupled to the inlet 1100 of the dust container 1084.

[0118] Dust container 1084 can be selectively attached to housing 1012. Dust container 1084 can be disassembled from housing 1012 of rotary hammer 1004 and can be removed to allow operator to empty dust or other debris from dust container 1084. In the embodiment shown, dust container 1084 is prevented from being fixed to housing 1012 when filter 1088 is not in place. For example, filter 1088 acts as a part of the connection between dust container 1084 and housing 1012. Thus, when filter 1088 is not in place, dust container 1084 is prevented from being connected to housing 1012. Filter 1088 is connected to the bottom side of fan 1200. In particular, filter 1088 is connected to shroud 1072 of fan 1200, which extends around the circumference of fan 1200 and is located below fan 1200. Fan 1200 and filter 1088 are both positioned in the lower part of body 1016, below the center of mass (CM).

[0119] The dust container 1084 includes an inlet 1100 for dust-laden air flow and an outlet 1104 defined by the outlet end of the filter 1088. More specifically, the dust container 1084 includes opposing side walls 1108 and a bottom wall 1112 extending between the side walls 1108. In addition, the dust container 1084 includes an end wall 1116 adjacent to each of the side walls 1108 and the bottom wall 1112. An opening 1120 is defined in the top wall 1118 through which the filter 1088 is received. The top wall 1118 further includes the inlet 1100 for dust-laden air. A connection port 1124 extends through the inlet 1100 to direct dust-laden air from the dust duct 1040 into the dust container 1084. In some embodiments, the connection port 1124 is a DEC 26 connection. The dust container 1084 is operable to collect dust and other debris from a workpiece during drilling and / or hammering operations performed by the rotary hammer 1004 to maintain a user's work area substantially free of dust and other debris.

[0120] As previously mentioned, fan 1200 generates both an extraction air flow path (AF1) and a cooling air flow path (AF2). Fan 1200 is a dual-axis radial exhaust fan positioned between motor 1048 and filter 1088. Fan 1200 is mounted to the output shaft of motor 1048 so that torque from motor 1048 drives the rotation of fan 1200. Accordingly, the axis of rotation of fan 1200 is coaxial with motor axis A1. Fig. 22As best shown, air enters the fan 1200 from two opposite directions along the axis of rotation A1 of the fan 1200. Specifically, the cooling air flow path (AF2) enters the fan 1200 from the top side of the fan 1200, while the suction air flow path (AF1) enters the fan 1200 from the bottom side of the fan 1200. Once air from either air flow path reaches the fan 1200, the air is directed radially outward from the fan 1200 to be exhausted.

[0121] In particular, the fan 1200 draws cooling air into the rotary hammer 1004 through the inlet opening 1066 in the housing 1012 of the rotary hammer 1004. The cooling air flow (AF2) is then drawn through the motor 1048 to cool the motor 1048. In some embodiments, the inner surface of the housing 1012 includes ribs that are used to guide the cooling air flow (AF2) into the motor 1048, thereby ensuring that the cooling air flow (AF2) travels through the motor 1048. The fan 1200 can further draw the cooling air through the controller 1205 to cool the controller 1205. After passing through one or both of the motor 1048 and the controller 1205, the cooling air flow (AF2) enters the fan 1200 from the top side of the fan 1200 and exits radially through the outlet 1104 of the fan 1200. The cooling air flow (AF2) then passes through the outlet opening 1074 ( Fig. 20 ) is discharged from the rotary hammer 1004. Specifically, the outlet 1104 is formed as a radial opening in the shroud 1072 of the fan 1200, which is aligned with the outlet opening 1074 to guide air to the outside of the rotary hammer 1004. In some embodiments, the outlet opening 1074 is provided on a single side of the housing 1012, and the outlet 1104 of the shroud 1072 is provided on a single side of the housing 1012.

[0122] The fan 1200 also generates an aspiration air flow (AF1) in which air is directed through the dust collection assembly 1008 toward the fan 1200 in the opposite direction of the cooling air flow (AF2) and then directed radially out of the exhaust port 1204. In particular, the air is drawn into the nozzle 1076, through the dust duct 1040, through the dust transfer ducts 1045 (i.e., the outer transfer duct 1140 and the inner transfer duct 1141), and into the dust container 1084 where the dust is trapped. Clean air is drawn upward into the fan 1200 through the filter 1088 and discharged through the outlet 1104 and the opening 1074. After the dust is separated from the air via the filter 1088, the clean air is discharged. In some embodiments, the filter 1088 is a high efficiency particulate air ("HEPA") filter.

[0123] Accordingly, the rotation of the fan 1200 simultaneously generates a suction air flow (AF1) and a cooling air flow (AF2). In the illustrated embodiment, the fan 1200 is a dual-fin fan having a first set of fan blades 1078 and a second set of fan blades 1080, such as Fig. 27 As best shown. A first set of fan blades 1078 is used to generate a suction air flow (AF1), and a second set of fan blades 1080 is used to generate a cooling air flow (AF2). However, other types of fans can be used to generate one or both air flows. For example, in some embodiments, a fan with a single set of fan blades can generate both a suction air flow (AF1) and a cooling air flow (AF2). In some embodiments, the cooling air flow (AF2) and the dust extraction air flow (AF2) can be two separate air flows that are isolated from each other until they merge within the fan 1200 and are discharged together as a merged air flow stream. In some embodiments, the cooling air flow is directed past other components of the rotary hammer 1004 (e.g., a circuit board) to cool these components as well.

[0124] In some embodiments, dust collection assembly 1008 may have additional features. For example, in the illustrated embodiment, the Hall plate for motor 1048 is positioned between motor 1048 and fan 1200. In addition, the bearing 1202 supporting the output shaft of motor 1048 is also arranged between motor 1048 and fan 1200, so that the cooling air flow moves through bearing 1202. This arrangement allows the air from the suction air flow to enter the filter 1088 from the dust pipe 1040 and pass through the fan 1200 without being guided around any bearing. In addition, this arrangement allows the cooling air of cooling motor 1048 and / or fan to pass through the stator of motor 1048 and be guided around the bearing support structure before reaching the fan 1200.

[0125] The dust collection assembly 1008 may further include a filter cleaning mechanism 1148 ( Fig.23), the filter cleaning mechanism removes dust on the filter 1088. In one embodiment, the filter cleaning mechanism 1148 includes a solenoid 1082, which is enabled to extend the pin 1086. The pin 1086 then engages anvil 1090, which rotates to knock the filter 1088 and release the debris. As mentioned above, the controller 1205 is suitable for operating the dust collection assembly 1008 and the drive unit 1044. This allows coordination between the two components. In one embodiment, when the fan 1200 is changed from the working state to the non-working state, the filter cleaning mechanism 1148 is automatically actuated. In another embodiment, when the motor 1048 is changed from the working state to the non-working state, the filter cleaning mechanism 1148 is automatically actuated. As used herein, when the fan 1200 stops rotating, or when the fan 1200 slows down to a speed lower than a predetermined threshold so that the air flow caused by the fan 1200 has effectively stopped, the fan 1200 is changed from the working state to the non-working state. The controller 1205 can monitor an indication of the rotational state of the fan 1200. In some embodiments, the controller 1205 can be configured to monitor the rotation of the fan 1200 by using a Hall effect sensor for directly detecting the rotational speed of the fan 1200 (e.g., by using a magnet that rotates with the fan 1200). In another embodiment, when the motor 1048 no longer transmits a rotational force to the fan 1200, the fan 1200 transitions from the working state to the non-working state. Similarly, when the motor 1048 stops rotating or when the motor 1048 decelerates to a predetermined speed threshold, the motor 1048 can transition from the working state to the non-working state. For example, the controller 1205 can monitor a sensor that detects a voltage or current applied to the motor 1048 to determine whether the motor 1048 has transitioned from the working state (i.e., providing torque to the fan 1200) to the non-working state.

[0126] Fig.28 Another embodiment of a filter cleaning mechanism 1448 is provided. In the illustrated embodiment, the filter cleaning mechanism 1448 includes an actuator in the form of a clutch bearing 1464 (i.e., a one-way bearing) positioned between the shaft of the motor 1048 and a rotatable plate 1462 having a plurality of tenons 1466. In normal operation, the motor 1048 and the fan 1200 rotate in a first direction (i.e., in a direction of rotation) about the rotation axis A1. Fig.28 When rotating in the first direction, torque from motor 1048 is not transferred to plate 1462. However, once fan 1200 transitions from an operating state to a non-operating state (i.e., decelerates to a stop or decelerates to below a predetermined threshold speed), motor 1048 is configured to rotate in a second or opposite direction (i.e., in a counterclockwise direction). Fig.28When the motor 1048 is pulsed in the opposite direction (in a clockwise direction), torque is transferred to the plate 1462 due to the action of the clutch bearing 1464. The tenon 1466 extending from the plate 1462 in turn engages the connecting rod 1468, which in turn impinges on the filter 1088. In the illustrated embodiment, the connecting rod 1468 rotates about the pivot 1472.

[0127] The integration of the dust collection assembly 1008 into the rotary hammer 1004 can provide many different benefits. For example, the integration of the dust collection assembly 1008 into the rotary hammer 1004 can allow for a reduction in the number of components used for the operation of the rotary hammer 1004 and the dust collection assembly 1008. This in turn can reduce the overall cost of the system. In addition, in some embodiments, the reduction in components can also reduce the overall weight and size of the system. Likewise, in some embodiments, the profile of the tool system is more compact, which can allow the user to more easily manipulate and hold the tool system. It should be understood that the various features and embodiments described in this disclosure can be mixed together or interchanged into different combinations of features and embodiments.

[0128] For example, the disclosed rotary hammer 1004 utilizes a single power source (e.g., battery 1056) and a single electric motor 1048 to operate the drive assembly 1052 and the dust collection assembly 1008. In addition, the rotary hammer 1004 includes a single controller suitable for controlling the operation of the drive assembly 1052 and the dust collection assembly 1008. In addition, a single fan 1200 can be used to generate two different air flow paths, which include a suction air flow path and a cooling air flow path. The first air flow path is a dust collector flow path, wherein dust-laden air enters through a nozzle 1076, travels through a dust pipe 1040, enters an external transfer pipe 1140 and an internal transfer pipe 1141, and deposits dust into a dust container 1084 with the help of a filter 1088. The air flow in the dust collector flow path is driven by the fan 1200 and the motor 1048. The second flow path is characterized as a cooling flow path that directs clean air over the motor 1048 and / or controller 1205 or other components of the drive assembly to cool those components.

[0129] In some embodiments, the rotary hammer 1004 is connected to the ONE- Compatible. In particular, the rotary hammer 1004 is capable of wireless communication (e.g., using Bluetooth or other near-field communication protocols), thereby allowing the rotary hammer 1004 to be monitored and / or controlled via a remote device (e.g., a smartphone). When wirelessly connected to a remote device, the remote device can track the position of the rotary hammer 1004, monitor the battery 1056, remotely lock the trigger 1098, and control other aspects of the rotary hammer 1004. For example, a user can control or adjust the speed and / or torque output of the motor 1048. Similarly, the user can adjust other operating settings of the tool. In some embodiments, the ONE-KEY electronic device is incorporated into the controller 1205. However, in other embodiments, the ONE-KEY electronic device can be provided by a separate controller PCB.

[0130] Although multiple embodiments of the rotary hammer have been described above, those skilled in the art will appreciate that the various features and components of the described embodiments are interchangeable. In addition, although the present disclosure has been described in detail with reference to certain preferred embodiments, there are variations and modifications within the scope and spirit of one or more independent aspects of the present disclosure described.

[0131] Various features of the present disclosure are set forth in the following claims.

Claims

1. A handheld power tool comprising: case; a tool receiving portion disposed on the first end of the housing and configured to receive a tool accessory; a motor positioned within the housing and operably coupled to the tool receiving portion to drive the tool attachment; a dust container selectively coupled to the housing; a dust duct coupled to the first end of the housing and in fluid communication with the dust container, the dust duct being movable between an extended position and a retracted position; as well as a fan positioned within the housing and driven by the motor to generate a suction air flow path through the dust duct and into the dust container, and a cooling air flow path through the housing, the suction air flow path and the cooling air flow path being isolated from each other until they reach the fan.

2. The handheld power tool according to claim 1, wherein: The cooling air flow path travels through at least one of the motor and the controller to provide a cooling effect.

3. The handheld power tool according to claim 2, wherein: The suction air flow path and the cooling air flow path enter the fan from two opposite directions along the rotation axis of the fan, and wherein the suction air flow path and the cooling air flow path exit the fan in a radial direction.

4. The handheld power tool of claim 1, further comprising a filter positioned within the housing, the filter being in fluid communication with the fan to draw dust-laden air through the filter.

5. The handheld power tool according to claim 4, wherein: The fan is positioned between the motor and the filter, and wherein the motor, the fan and the filter are aligned along a motor axis, and wherein a rotational axis of the fan is coaxial with the motor axis.

6. The handheld power tool of claim 4, further comprising a filter cleaning mechanism positioned within the housing, the filter cleaning mechanism configured to remove debris trapped in the filter.

7. The handheld power tool of claim 6, further comprising a controller positioned within the housing, the controller configured to control the motor and the filter cleaning mechanism.

8. The handheld power tool as described in claim 1 further comprises a dust transfer pipe, which is arranged between the dust pipe and the dust container to transfer dust from the dust pipe to the dust container, and the dust transfer pipe extends through at least a portion of the housing.

9. The handheld power tool according to claim 1, wherein: The tool attachment defines a first axis, the motor defines a second axis, and wherein the first axis is angled relative to the second axis.

10. The handheld power tool according to claim 9, wherein: An angle between the first axis and the second axis is between 80 degrees and 135 degrees.

11. The handheld power tool according to claim 10, wherein: The angle between the first axis and the second axis is 90 degrees.

12. A handheld power tool comprising: case; a tool receiving portion disposed on the first end of the housing and configured to receive a tool accessory; a motor positioned within the housing and operably coupled to the tool receiving portion to drive the tool attachment; a dust container selectively coupled to the housing; an on-drill dust tube coupled to the first end of the housing and in fluid communication with the dust container, the on-drill dust tube being movable between an extended position and a retracted position; as well as a fan positioned within the housing and operable to generate a suction air flow path through the dust duct and into the dust container, and a cooling air flow path through the housing, the suction air flow path and the cooling air flow path being isolated from each other until they reach the fan.

13. The handheld power tool according to claim 12, wherein: The drill bit dust tube is removably coupled to the housing.

14. The handheld power tool according to claim 13, wherein: The on-drill dust tube is removably coupled to the housing via at least one of a snap fit and a rotatable connection.

15. The handheld power tool of claim 14, further comprising a dust transfer tube configured to selectively couple the on-bit dust tube to the housing, and wherein, The dust transfer duct is axially fixed to the housing via a snap-fit ​​connection, and wherein the dust transfer duct is rotationally fixed to the housing via a rotatable connection.

16. A handheld power tool comprising: case; a tool receptacle disposed on the first end of the housing and configured to receive a tool attachment defining a working axis; a handle extending rearwardly from the second end of the housing; a motor positioned within the housing and operably coupled to the tool receiving portion to drive the tool attachment; a dust container selectively coupled to the housing; a dust duct coupled to the first end of the housing and in fluid communication with the dust container, the dust duct being movable between an extended position and a retracted position; a dust transfer duct fluidly connecting the dust duct and the dust container, the dust transfer duct extending through at least a portion of the housing; as well as a fan positioned within the housing and operable to generate a suction air flow path through the dust duct and into the dust container, and a cooling air flow path through the housing, the suction air flow path and the cooling air flow path being isolated from each other until they reach the fan.

17. The handheld power tool of claim 16, further comprising an auxiliary handle removably coupled to a rear end of the handheld power tool.

18. The handheld power tool according to claim 17, wherein: The auxiliary handle extends in a direction generally parallel to the working axis.

19. The handheld power tool of claim 18, further comprising a trigger operably coupled to the motor to actuate the motor, the trigger disposed along the handle proximate the working axis whereby the tool attachment, the trigger and the auxiliary handle are aligned.

20. The handheld power tool of claim 17, wherein: The auxiliary handle is at least one of extendable to different lengths or rotatable to different orientations relative to the housing.

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