CN108340015B - Hand-held power tool - Google Patents

Abstract

The invention discloses a hand-held power tool, comprising: the power tool comprises a shell, an output piece, a prime motor and a hook assembly, wherein the output piece is used for outputting power, the prime motor is arranged in the shell, and the hook assembly is used for hanging the handheld power tool; the hook component comprises: the hook component comprises a connecting piece and a hook piece, wherein the connecting piece is used for connecting the hook component to the shell, and the hook piece comprises a hook part and a handle part which can rotate relative to the connecting piece by taking a first axis as a shaft; wherein the connecting member is movable relative to the housing between at least a first position and a second position; after the connecting piece moves from the first position to the second position, the connecting piece generates rotation relative to the connecting piece and the rotation axis of the connecting piece generates rotation relative to the connecting piece generates displacement. The hook assembly is reasonable in structure and position arrangement, and cannot interfere with a hand of a user holding the hand-held power tool.

Description

Hand-held power tool

Technical Field

The invention relates to a hand-held power tool, in particular to a saw tool.

Background

The electric circular saw is a tool for sawing operation by driving the saw blade, and has the characteristics of safety, reliability, reasonable structure, high working efficiency and the like. The electric circular saw generally includes: the device comprises a shell, a motor, a bottom plate, an angle adjusting mechanism, a depth adjusting structure and a guiding device.

When using the electric circular saw, the user often needs to work at the high altitude, therefore need hang the electric circular saw, and for this reason, the electric circular saw can also include the couple that is used for hanging. However, the existing hook is unreasonable in position and structure arrangement, and generally interferes with a hand of a user operating the electric circular saw, so that the use of the user is affected.

The motor is arranged in the shell, and the phenomenon of heat dissipation airflow backflow can occur at the motor, so that the temperature rise effect of the motor is poor.

The angle adjusting mechanism is arranged on the bottom plate and is used for a user to adjust the inclination angle of the saw blade for cutting. However, when adjusting the tilt angle, it is often difficult for the user to quickly and accurately set the tilt angle.

The depth adjusting mechanism is used for a user to adjust the cutting depth of the saw blade, but the existing depth adjusting mechanism often swings to cause the error of scale indication.

The guide device is used for guiding the saw blade to realize straight line cutting, and the existing guide device can only realize short distance straight line cutting.

In addition, the existing electric circular saw usually installs the saw blade to the main machine through the screw, so that when the saw blade needs to be disassembled and assembled, auxiliary devices such as a screwdriver need to be used, and the operation of a user is not facilitated.

Disclosure of Invention

To overcome the shortcomings of the prior art, the present invention provides a hand-held power tool which is convenient for users to operate.

In order to achieve the above object, the present invention adopts the following technical solutions:

a hand-held power tool comprising: the power tool comprises a shell, an output piece, a prime motor and a hook assembly, wherein the output piece is used for outputting power, the prime motor is arranged in the shell, and the hook assembly is used for hanging the handheld power tool; the hook component comprises: the hook component comprises a connecting piece and a hook piece, wherein the connecting piece is used for connecting the hook component to the shell, and the hook piece comprises a hook part and a handle part which can rotate relative to the connecting piece by taking a first axis as a shaft; wherein the connecting member is movable relative to the housing between at least a first position and a second position; after the connecting piece moves from the first position to the second position, the connecting piece generates rotation relative to the connecting piece and the rotation axis of the connecting piece generates rotation relative to the connecting piece generates displacement.

Further, the housing is formed with an arc-shaped groove, and the connecting member includes a moving portion capable of moving in the arc-shaped groove along an extending direction of the arc-shaped groove to position the connecting member at the first position and the second position.

Furthermore, the arc-shaped groove is an arc-shaped groove, and a central line corresponding to the arc-shaped groove wall of the arc-shaped groove is perpendicular to the first axis.

Furthermore, the connecting piece also comprises a stopping part for stopping the moving part from being separated from the arc-shaped groove, and the stopping part and the moving part form detachable connection.

Further, the rotation axis of the connecting piece which generates rotation relative to the connecting piece is perpendicular to the first axis.

Further, the housing is also formed with: the auxiliary handle part is used for being held by the other hand of the user, and the connecting part is used for connecting the main handle part and the auxiliary handle part; the hook component is arranged on the connecting portion and located between the main handle portion and the auxiliary handle portion.

Further, the hand-held power tool is a saw-like tool capable of driving a saw blade to rotate.

Further, the first axis is perpendicular to the rotation axis of the saw blade, and the rotation axis of the connecting piece which rotates relative to the connecting piece is parallel to the rotation axis of the saw blade.

A hand-held power tool comprising: the method comprises the following steps: the power tool comprises a shell, an output piece, a prime motor and a hook assembly, wherein the output piece is used for outputting power, the prime motor is arranged in the shell, and the hook assembly is used for hanging the handheld power tool; the hook component comprises: the hook component comprises a connecting piece and a hook piece, wherein the connecting piece is used for connecting the hook component to the shell, and the hook piece comprises a hook part and a handle part which can rotate relative to the connecting piece by taking a first axis as a shaft; wherein, the connecting piece and the shell form a rotary connection taking a second axis which is not in the same plane with the first axis as an axis.

Further, a second axis of rotation of the connector relative to the housing is perpendicular to the first axis.

Further, the housing is also formed with: the auxiliary handle part is used for being held by the other hand of the user, and the connecting part is used for connecting the main handle part and the auxiliary handle part; the hook component is arranged on the connecting portion and located between the main handle portion and the auxiliary handle portion.

Further, the hand-held power tool is a saw-like tool capable of driving a saw blade to rotate.

The invention has the advantages that: the hook assembly is reasonable in structure and position arrangement, and cannot interfere with a hand of a user holding the hand-held power tool.

Drawings

Fig. 1 is a perspective view of an electric circular saw as an embodiment;

FIG. 2 is a plan view of the electric circular saw of FIG. 1;

FIG. 3 is a sectional view of the electric circular saw of FIG. 1;

FIG. 4 is a cross-sectional view of a portion of the housing, motor and fan of FIG. 1;

FIG. 5 is a perspective view of the stopper of FIG. 4;

FIG. 6 is a schematic view of the surround and stop of FIG. 4 in a projection in a plane perpendicular to the axis of rotation of the rotor;

FIG. 7 is a cross-sectional view of the surround, rotor and stop of FIG. 4;

FIG. 8 is a perspective view of a portion of the housing and hook assembly of FIG. 1 with the connector in a first position;

FIG. 9 is a plan view of the structure shown in FIG. 8;

FIG. 10 is a perspective view of the hook assembly of FIG. 8;

FIG. 11 is a perspective view of a portion of the housing and hook assembly of FIG. 1 with the connector in a second position;

FIG. 12 is a plan view of the structure shown in FIG. 11;

FIG. 13 is a perspective view of a portion of the housing and hook assembly of FIG. 1 with the hook members rotated 90 degrees relative to the attachment members;

FIG. 14 is a partial exploded view of the hook assembly of FIG. 8;

FIG. 15 is a perspective view of the base plate and angle adjustment mechanism of FIG. 1;

FIG. 16 is a perspective view of another angle of the base plate and angle adjustment mechanism of FIG. 1;

FIG. 17 is an exploded view of the structure shown in FIG. 15;

FIG. 18 is an exploded view from another angle of the configuration shown in FIG. 15

FIG. 19 is a perspective view of the electric circular saw of FIG. 1 mated with a guide rail;

FIG. 20 is a perspective view of the base plate and guide of FIG. 19;

FIGS. 21 to 25 are plan views of the electric circular saw of FIG. 1, which show the process of moving the guide from the second coupling position to the first coupling position;

FIG. 26 is a perspective view of the base plate, shield and depth adjustment mechanism of FIG. 1;

FIG. 27 is a plan view of the structure shown in FIG. 26;

FIG. 28 is a partial exploded view of the structure shown in FIG. 26;

FIG. 29 is a partial exploded view from another angle of the structure shown in FIG. 26;

FIG. 30 shows the swing of the depth bracket as it is guided only by the slide bar;

FIG. 31 shows the rocking motion of the depth bracket as it is guided by the boss;

FIG. 32 is a plan view of the working attachment and fastening device of FIG. 1;

FIG. 33 is a perspective view of the fastening device of FIG. 32;

FIG. 34 is an exploded view of the fastening device of FIG. 33;

fig. 35 is an exploded view of another angle of the fastening device of fig. 33.

Detailed Description

The power tool shown in fig. 1 to 3 is a hand-held power tool, in particular an electric cutting tool, which is further an electric saw, more particularly an electric circular saw 100.

As shown in fig. 1 and 2, the electric circular saw 100 includes: the tool main body 10, the bottom plate 20, the angle adjusting mechanism 30, the depth adjusting mechanism 40, the guide device 50 and the hook assembly 60.

For convenience of explanation of the technical solution of the present invention, an upper side, a lower side, a front side, a rear side, a left side, and a right side as shown in fig. 1 are also defined.

As shown in fig. 1 to 3, the tool main body 10 includes: a housing 11, a motor 12, a fan 13, a working attachment 14, and a drive shaft 15.

The housing 11 accommodates the motor 12, the fan 13, the drive shaft 15, and the like. The motor 12 serves as a prime mover of the electric circular saw 100 for outputting power and driving the working attachment 14, and the motor 12 includes a motor shaft 121 rotatable about the motor axis 101. The fan 13 can rotate synchronously with the motor shaft 121, so as to dissipate heat of the motor 12 and other structures. The working attachment 14 serves as a functional part of the electric circular saw 100 for performing a tool function, the working attachment 14 may be a cutting part for performing a cutting function, and the working attachment 14 may be a circular saw blade in particular for the electric circular saw 100. A drive shaft 15 is provided as an output member of the electric circular saw 100 for outputting power, the drive shaft 15 being disposed between the motor 12 and the working attachment 14 to drive the working attachment 14, and specifically, the drive shaft 15 is used to drive the saw blade to rotate about a rotation axis 102 passing through the saw blade itself. It will be appreciated by those skilled in the art that for the electric circular saw 100, the driving shaft 15 may be a separate shaft driven by the motor 12, or may be formed directly by the motor shaft 121 of the motor 12.

Specifically, the housing 11 may include: a motor housing portion 111, a main handle portion 112, a sub handle portion 113, a connecting portion 114, and a shroud 115. Wherein the motor housing portion 111 is configured to receive the motor 12, the motor housing portion 111 further comprises a surrounding portion 111a surrounding the motor 12 in a circumferential direction around the motor axis 101 and an end portion 111b provided at an end of the surrounding portion 111a remote from the working attachment 14. The main handle portion 112 and the sub handle portion 113 are respectively used for being held by both hands of a user to achieve the purpose of holding the electric circular saw 100 by both hands, thereby enabling the user to operate the electric circular saw 100 more stably. The connecting portion 114 is provided between the main handle portion 112 and the sub handle portion 113, and serves to connect the main handle portion 112 and the sub handle portion 113. The shroud 115 serves to partially enclose the blade to prevent the blade from throwing debris toward the user during operation.

As shown in fig. 1 to 4, the fan 13 is located in the motor housing portion 111, and the fan 13 is further disposed on a side of the motor 12 away from the working attachment 14, and the fan 13 is specifically a centrifugal fan 13. The housing 11 is further formed with an airflow inlet 116 and an airflow outlet 117, the airflow inlet 116 communicating with the inside and the outside of the housing 11, and the airflow outlet 117 communicating with the inside and the outside of the housing 11. The position of the airflow inlet 116 on the housing 11 may correspond to an electronic component such as a circuit board in the housing 11, the airflow outlet 117 is disposed on a side of the motor 12 away from the working accessory 14, and the airflow outlet 117 is further disposed at an end of the surrounding portion 111a close to the end. Thus, when the motor 12 drives the fan 13 to rotate, the fan 13 can draw the airflow at the airflow inlet 116 and throw the airflow to the airflow outlet 117 after passing through the circuit board and the motor 12, thereby achieving the effect of dissipating heat from the motor 12 and the circuit board.

As shown in fig. 1 to 6, specifically, the motor 12 is an external rotor motor, which includes: a stator 122, a rotor 123 and the motor shaft 121. The stator 122 is fixedly arranged in the housing 11, the motor shaft 121 is rotatably arranged in the housing 11, the rotor 123 surrounds the stator 122 and rotates synchronously with the motor shaft 121, and a vent hole 123a for allowing air flow to pass is further arranged on one side of the rotor 123 close to the fan 13. Thus, when the motor 12 is started, the airflow enters from the front side of the motor 12, flows through the stator 122, then flows out from the vent hole 123a at the rear side of the motor 12, and finally flows to the airflow outlet 117. However, since the rotor 123 is rotatably provided in the housing 11, a certain clearance exists between the rotor 123 and the inner wall of the housing 11, and further, the clearance refers to a clearance 124 between the rotor 123 and the inner wall of the surrounding portion 111 a. Thus, the air flow flowing out from the rear side of the motor 12 is likely to flow back to the front through the gap 124 between the rotor 123 and the inner wall of the surrounding portion 111a, thereby causing a temperature increase of the motor 12, which is disadvantageous for heat dissipation of the motor 12. For this reason, the electric circular saw 100 further includes a stopper 125 for stopping the air current from flowing backward from one side of the motor 12 close to the fan 13 to the other side, that is, the stopper 125 for stopping the air current flowing out from the rear side of the motor 12 from flowing backward from the rear side of the motor 12 to the front side of the motor 12 through the gap 124 between the rotor 123 and the surrounding portion 111a, so that the heat dissipation effect to the motor 12 can be improved.

The stopper 125 is fixedly disposed in the housing 11, and further, the stopper 125 is fixedly connected to the stator 122. As shown in fig. 3 and 4, the stopper 125 includes a stopper portion 125a provided at the gap 124 between the rotor 123 and the surrounding portion 111 a. In addition, as shown in fig. 3 and 5, the projection of the stopper 125 in a plane perpendicular to the rotational axis of the rotor 123 is at least partially located outside the projection of the rotor 123 in the plane. Wherein the axis of rotation of the rotor 123 coincides with the motor axis 101 of the motor 12.

Specifically, the stopper 125 further includes: a first extension 125b and a second extension 125 c. The first extension 125b extends from the stopper 125a in a radial direction toward a direction away from the motor 12, and the first extension 125b extends beyond the gap 124 between the rotor 123 and the surrounding portion 111a in the radial direction. The second extending portion 125c extends from the stopper portion 125a in a radial direction toward a direction close to the motor 12, and the second extending portion 125c extends in the radial direction beyond the gap 124 between the rotor 123 and the surrounding portion 111 a. That is, the first extension 125b extends outward from the outer wall of the stopper 125a, and the second extension 125c extends inward from the inner wall of the stopper 125 a. In addition, the stopping portion 125a extends in a direction parallel to the rotation axis of the rotor 123, the length of the stopping portion 125a in the direction parallel to the rotation axis of the rotor 123 is greater than the length of the first extending portion 125b in the radial direction, and further, the length of the stopping portion 125a in the direction parallel to the rotation axis of the rotor 123 is greater than 10mm, so that the length of the stopping portion 125a is sufficiently long, and a better wind shielding effect can be achieved. Here, the radial direction refers to a radial direction in the circumferential direction around the rotation axis of the rotor 123.

As shown in fig. 7, a maximum dimension in the radial direction of the gap 126 between the stopper portion 125a and the surrounding portion 111a is smaller than a minimum dimension in the radial direction of the gap 124 between the rotor 123 and the surrounding portion 111a, and further, the maximum dimension in the radial direction of the gap 126 between the stopper portion 125a and the surrounding portion 111a is greater than 0mm and equal to or less than 2 mm. Here, the radial direction refers to a radial direction in the circumferential direction around the rotation axis of the rotor 123.

As shown in fig. 1 and 8, the electric circular saw 100 is a hand-held electric tool, and when a user operates the electric circular saw 100, particularly when the user works at high altitudes, it is often necessary to suspend the electric circular saw 100 by the hook assembly 60 after operating the electric circular saw 100 for a certain period of time so as to be used again later. The hook assembly 60 may specifically include: an attachment member 61 and a hook member 62, wherein the attachment member 61 is used to attach the hook assembly 60 to the housing 11, and the hook member 62 is used to suspend the electric circular saw 100.

Specifically, as shown in fig. 8 to 10, the hook assembly 60 is provided on the connecting portion 114 of the housing 11 between the main handle portion 112 and the sub handle portion 113. In particular, the hook member 62 comprises a hook portion 621 and a handle portion 622, wherein the handle portion 622 and the connecting member 61 form a rotational connection about the first axis 103, and the first axis 103 is also perpendicular to the rotational axis 102 of the saw blade.

As shown in fig. 8 and 11, the link 61 is movable between a first position and a second position relative to the housing 11, and after the link 61 moves from the first position to the second position, the link 61 rotates relative to itself and the rotation axis 104 of the link 61 rotates relative to itself is also displaced, and the rotation axis 104 of the link 61 rotates relative to itself is perpendicular to the first axis 103, and the rotation axis 104 of the link 61 is also parallel to the rotation axis 102 of the saw blade.

Specifically, the housing 11 is formed with an arc-shaped groove 114a, the arc-shaped groove 114a is provided on the connecting portion 114, and the arc-shaped groove 114a is further an arc-shaped groove. The link 61 further includes a moving portion 611, the moving portion 611 being movable within the arcuate slot 114a in the extending direction of the arcuate slot 114a, the moving portion 611 causing the link 61 to be located at the first position and the second position when moving within the arcuate slot 114a to both ends of the arcuate slot 114a, respectively.

As shown in fig. 8 and 9, when the connecting member 61 is located at the first position, the hook portion 621 of the hook member 62 extends substantially downward, so that when the user grips the main handle portion 112 and the sub-handle portion 113 with both hands, respectively, the hook portion 621 does not interfere with the user's hands, thereby facilitating the user's operation. In fact, the housing 11 may also form a groove having another shape for moving the moving part 611, for example, the groove can make the moving part 611 rotate first and then move along a straight line, so that, after the connecting element 61 moves from the first position to the second position, the connecting element 61 rotates relative to itself and the connecting element 61 also moves relative to the rotation axis 104, and therefore, such an embodiment also belongs to the protection scope of the present invention.

As mentioned above, the arc-shaped slot 114a is an arc-shaped slot, and the center line corresponding to the arc-shaped slot wall of the arc-shaped slot 114a is perpendicular to the first axis 103. Thus, it can be understood that the process of moving the connecting member 61 from the first position to the second position along the extending direction of the arc-shaped slot 114a can also be regarded as the connecting member 61 revolving around a second axis 105 which is not coincident with the rotation axis 104 of the connecting member 61 relative to the housing 11, the second axis 105 also being out of the same plane as the first axis 103, and the second axis 105 also being perpendicular to the first axis 103. It should be noted that, in the present embodiment, the second axis 105 when the connecting member 61 rotates is also a center line corresponding to the arc-shaped slot wall of the arc-shaped slot 114 a. In fact, it is within the scope of the present invention to provide that the connection element 61 and the housing 11 form a rotatable connection that can be pivoted about a second axis 105 that is not coincident with the rotation axis 104 of the connection element 61.

As shown in fig. 10 and 14, the arc-shaped groove 114a penetrates the connecting portion 114 in a direction parallel to the rotation axis 104 of the connecting member 61, and the connecting member 61 further includes a stopper portion 612 constituting a detachable connection with the moving portion 611. The stopper 612 serves to prevent the moving portion 611 from escaping from the arc-shaped groove 114 a. Thus, when the user mounts the hook assembly 60, the blocking portion 612 may be detached from the moving portion 611 first, then the moving portion 611 is made to pass through the arc-shaped slot 114a, and then the blocking portion 612 is mounted to the moving portion 611, thereby mounting the hook assembly 60 to the housing 11.

Referring to the hook assembly 60 in more detail, as shown in fig. 8 and 9, the connecting member 61 is located at the first position in the arc-shaped slot 114a, so that the user can use the electric circular saw 100 to perform a sawing operation, and the hook member 62 does not interfere with the user's hands holding the main handle portion 112 and the sub handle portion 113, respectively, thereby facilitating the user's operation. When the user suspends the use of the electric circular saw 100 and needs to hang the electric circular saw 100, the user can operate the hook assembly 60 to move the connecting member 61 from the first position to the second position along the extending direction of the arc-shaped groove 114 a. As shown in fig. 11 and 12, the link 61 has moved to the second position, and the hook member 62 has rotated approximately 90 degrees relative to the housing 11. As shown in fig. 11 and 13, the user can continue to operate the hook assembly 60 such that the hook member 62 rotates about the first axis 103 and approximately 90 degrees relative to the link member 61. As shown in fig. 13, the hook member 62 is now positioned relative to the housing 11 such that the hook member 62 engages a cross member or the like in a work environment to suspend the electric circular saw 100.

As shown in fig. 1, 15 and 16, the base plate 20 and the housing 11 form a rotatable connection about a pivot axis 106. The pivot axis 106 is perpendicular to the rotational axis 102 of the saw blade. In this way, when the housing 11 rotates about the pivot axis 106 with respect to the base plate 20, the saw blade of the electric circular saw 100 can be tilted, so that the electric circular saw 100 can perform the tilted cutting.

As shown in fig. 1, 15 to 18, the angle adjustment mechanism 30 is used to guide the rotation of the housing 11 relative to the base plate 20 about the pivot axis 106 and to adjust the angle of rotation of the housing 11. The angle adjusting mechanism 30 includes: an angle disk 31, an adapter 32, a slider 33, a limit stop 34 and an operating element 35.

The angle plate 31 is fixedly mounted to the bottom plate 20, and further, the angle plate 31 may be integrally formed with the bottom plate 20, and the angle plate 31 is formed with an arc groove 311. One end of the adaptor 32 is connected with the housing 11, the other end is connected with the sliding part 33, and the sliding part 33 comprises a sliding part 331 which is slidably arranged in the arc-shaped groove 311. The end of the adapter 32 connected to the housing 11 is also connected to the angle plate 31 in a rotatable manner about the pivot axis 106, so that the slider 33 is connected to the housing 11 in a rotatable manner about the pivot axis 106 with the housing 11. In this way, when the housing 11 rotates the slider 33 with the pivot axis 106 as an axis, the sliding portion 331 can slide in the arc slot 311, and the distance that the sliding portion 331 slides in the arc slot 311 reflects the angle of rotation of the housing 11, that is, the angle of oblique cutting of the electric circular saw 100. The limiting member 34 is used for limiting the sliding portion 331 from sliding in the circular arc groove 311 to a predetermined position away from the bottom plate 20. For example, when the sliding portion 331 slides from one end of the circular arc groove 311 close to the bottom plate 20 to a position where the angle of the oblique cut of the electric circular saw 100 is 45 degrees, the limiting member 34 can limit the sliding portion 331 at the position so that the sliding portion 331 cannot further slide in a direction away from the bottom plate 20. The electric circular saw 100 further includes a plurality of positioning structures 312 cooperating with the position-limiting member 34 to position the position-limiting member 34, so that when the position-limiting member 34 cooperates with the positioning structures 312 at different positions, the sliding member 33 can slide to different predetermined positions. The operating element 35 is used for being operated by a user, and when the user operates the operating element 35, the operating element 35 can also drive the limiting member 34 to be disengaged from the positioning structure 312.

Specifically, the limiting member 34 is disposed on one side of the angle scale 31 close to the housing 11, the limiting member 34 and the angle scale 31 form a rotatable connection with an axis parallel to the pivot axis 106 as an axis, the limiting member 34 further includes a limiting portion 341 corresponding to the position of the arc groove 311, and the sliding member 33 is limited by the limiting portion 341. The operating element 35 is disposed on the other side of the angle plate 31 away from the stopper 34, a through hole 313 is formed on the angle plate 31, and the operating element 35 and the stopper 34 are connected by a screw 36 passing through the through hole 313. The operating element 35 may be embodied as a knob which is rotated synchronously with the stop element 34, so that the stop element 34 can be rotated with the knob when the knob is operated by a user. The positioning structure 312 is a groove disposed on the angle scale 31 and recessed toward a direction away from the position-limiting member 34, and the position-limiting member 34 is formed with a protrusion 342 capable of being inserted into the groove. It should be noted that the positions of the grooves and the protrusions 342 can be interchanged as would be understood by one skilled in the art.

The operating element 35 is also slidably connected to the angle plate 31 in the axial direction of rotation of the stop 34 relative to the angle plate 31, and the angle adjustment mechanism 30 further includes a biasing member 37 biasedly disposed between the operating element 35 and the angle plate 31, the biasing member 37 being operable to move the operating element 35 away from the angle plate 31, and thereby move the protrusion 342 on the stop 34 toward engagement with the positioning structure 312 when rotated into alignment with the positioning structure 312. The angle scale 31 is further provided with scale lines 314 around the through hole 313, and a user can operate the knob to rotate to a preset angle, so that the electric circular saw 100 can be quickly positioned at different cutting angles.

Further, the angle adjusting mechanism 30 further includes a locking member 38, and the locking member 38 is used for locking the position of the sliding member 33 in the circular arc groove 311.

How to use the electric circular saw 100 to perform the bevel cutting is described below, for example, taking a 45-degree cut as an example: firstly, the user presses the operating element 35 to make the operating element 35 overcome the bias of the biasing member 37, so that the stopper 34 is disengaged from one of the positioning structures 312, then rotates the operating element 35 to the 45-degree position, at this time, the stopper 34 rotates along with the operating element 35 and rotates until the protrusion 342 is aligned with the other positioning structure 312, then the user releases the operating element 35, at this time, the stopper 34 moves towards the position engaged with the positioning structure 312 under the action of the biasing member 37, then the user slides the slider 33 in the arc groove 311 to the stopper 341, and finally the user locks the position of the slider 33 in the arc groove 311 through the locking member 38, thereby realizing the quick positioning of the 45-degree cutting of the electric circular saw 100.

As shown in fig. 3, 19 and 20, the sole plate 20 is formed with a sole plate plane 21 for contacting a workpiece, the sole plate plane 21 also being parallel to the rotational axis 102 of the saw blade. The guide 50 is used for guiding the electric circular saw 100 to cut a workpiece in a straight line, and the guide 50 includes: a first guide 51, a second guide 52, and a coupling 53. Wherein the first guide 51 comprises a guide plane 511 for contacting a side edge of the workpiece, the guide plane 511 extending along the first line 107; the second guide member 52 is formed with a guide fitting 521 for engaging with one of the guide rails 201, the guide fitting 521 extending in a direction parallel to the first straight line 107. As shown in fig. 19 and 25, the coupling 53 enables the guide 50 to be coupled to the base plate 20 at a first coupling position. As shown in fig. 21, the coupling member 53 also enables the guide 50 to be coupled to the base plate 20 at the second coupling position. The user can selectively couple the guide 50 to the first coupling position or the second coupling position according to actual needs. When the guide 50 is located at the first coupling position, the first guide 51 is located at the upper side of the floor plane 21, and the second guide 52 is located at the lower side of the floor plane 21; when the guide 50 is located at the second coupling position, the first guide 51 is located at a lower side of the floor plane 21 and the second guide 52 is located at an upper side of the floor plane 21.

Thus, when the guide 50 is located at the first coupling position, the first guide 51 is located at the upper side of the bottom plate plane 21, the second guide 52 is located at the lower side of the bottom plate plane 21, and the guide adapter 521 of the second guide 52 is also located at the side of the motor 12 away from the saw blade, so that the guide adapter 521 can be engaged with the guide rail 201, and the electric circular saw 100 can be guided by the second guide 52 to realize the straight cutting. When the guide 50 is located at the second coupling position, the first guide 51 is located at a lower side of the base plate plane 21, the second guide 52 is located at an upper side of the base plate plane 21, and the guide plane 511 of the first guide 51 is located at a side of the cutting member away from the motor 12, so that the guide plane 511 can be engaged with a side edge of the workpiece, and the electric circular saw 100 can be guided by the first guide 51 to perform a straight cutting.

As shown in fig. 3 and 19 to 25, when the guide 50 is located at the first coupling position, the first guide 51 and the second guide 52 are located at a side of the motor 12 away from the saw blade, and when the guide 50 is located at the second coupling position, the first guide 51 and the second guide 52 are located at a side of the saw blade away from the motor 12. When the guide device 50 moves from the second combination position to the first combination position, the first guide 51 is located on the upper side of the bottom plate plane 21, and the position of the first guide 51 on the upper side of the bottom plate plane 21 is easily interfered with the motor 12, so that the first guide 51 and the second guide 52 form a rotational connection with the third axis 108 as an axis. Specifically, the third axis 108 of the first guide 51 and the second guide 52 constituting the rotational connection is parallel to the first straight line 107. Thus, when the guide device 50 moves from the second combination position to the first combination position, the first guide member 51 can rotate relative to the second guide member 52 to the side of the motor 12 away from the saw blade, so that the first guide member 51 can be prevented from interfering with the position of the motor 12.

In addition, in other embodiments, the first guide 51 may also be slidably connected to the second guide 52, and the relative sliding direction of the first guide and the second guide is perpendicular to the direction of the first straight line 107. Thus, when the guide device 50 moves from the second combination position to the first combination position, the first guide member 51 can slide relative to the second guide member 52 to the side of the motor 12 away from the saw blade, so that the first guide member 51 can be prevented from interfering with the position of the motor 12.

As shown in fig. 20, the coupling member 53 may be embodied as a ruler that can be coupled to the base plate 20. The surface of the rule may be further provided with a scribed line 531 for indicating the size of the workpiece cut by the electric circular saw 100.

The movement of the guide 50 from the second engagement position to the first engagement position is described in detail below: as shown in fig. 21, the guide 50 is at the second coupling position, when the guide plane 511 is at the lower side of the base plane 21, the guide plane 511 can contact the side of the workpiece, then, as shown in fig. 22 to 23, the user removes and turns over the guide 50 from the second coupling position, then, as shown in fig. 23 and 24, the user rotates the first guide 51 at an angle, preferably 90 degrees, with respect to the second guide 52, and finally, as shown in fig. 25, the user couples the guide 50 to the first coupling position.

As shown in fig. 3 and 26, the base plate 20 supports the housing 11 and also forms a rotational connection with the housing 11 about a first axis of rotation 109, which first axis of rotation 109 is also parallel to the rotational axis 102 of the saw blade. The depth adjustment mechanism 40 is used to guide and adjust the angle of rotation of the housing 11 relative to the base plate 20 about the first rotation axis 109.

As shown in fig. 26 to 29, the depth adjustment mechanism 40 includes: a depth bracket 41 and a slide bar 42. The depth support 41 forms with the base plate 20 a rotational connection about a second axis of rotation 110, the second axis of rotation 110 being parallel to the axis of rotation 102 of the saw blade, the second axis of rotation 110 also being parallel to and not coinciding with the first axis of rotation 109. The depth bracket 41 is formed with a circular-arc hole 411, and the circular-arc hole 411 penetrates the depth bracket 41 in a direction parallel to the first rotation axis 109. The sliding rod 42 and the housing 11 form a fixed connection, and the sliding rod 42 further passes through the arc hole 411 and is in clearance fit with the arc hole 411. Thus, when the housing 11 rotates relative to the bottom plate 20, the sliding rod 42 can slide in the arc hole 411 along the extending direction of the arc hole 411, and the sliding rod 42 does not always contact with the hole wall of the arc hole 411. The sliding rod 42, while being guided in the circular hole 411, will largely swing the depth bracket 41, causing a deviation of the scale indicated by the pointer on the depth bracket 41. In addition, it is known that, when the electric circular saw 100 is manufactured, an error may occur in the position of the rotation point 412 of the depth bracket 41 relative to the bottom plate 20, so that, if only the slide rod 42 is used for guiding, because the slide rod 42 moves together with the housing 11 when the housing 11 rotates relative to the bottom plate 20 and the slide rod 42 is closer to the rotation point 412, when the position of the rotation point 412 is incorrect, a large swing of the depth bracket 41 may occur.

In this case, the housing 11 is further formed with a guide rail 118 at the shield 115 for guiding the relative rotation between the base plate 20 and the housing 11, and the guide rail 118 is embodied as an arc-shaped groove formed on the shield 115, and the arc-shaped groove is disposed at a side of the shield 115 close to the motor 12. Correspondingly, the depth support 41 is formed or fixedly connected with a guide structure 413 capable of sliding along the guide track of the guide rail 118, specifically, the guide structure 413 is a protruding portion capable of being inserted into a groove, and the protruding portion is formed on one side of the depth support 41 close to the shield 115. The groove wall of the arc-shaped groove is a guide wall surface 118a extending in an arc shape, the protrusion includes a contact wall surface 413a movable in the extending direction of the guide wall surface 118a when the housing 11 rotates about the first rotation axis 109 with respect to the bottom plate 20, and the contact wall surface 413a has a contact point always contacting the guide wall surface 118 a. More specifically, the protrusion has a substantially kidney-shaped configuration, and one of two opposite waists thereof is always in contact with one wall surface of the groove so as to be considered as the above-mentioned contact wall surface 413a, and the other waist thereof is spaced from the other wall surface of the groove by 0.5mm, and each point on the waist of the protrusion which is always in contact with the groove may be considered as the above-mentioned contact point. Wherein the protrusion is integrally formed with the depth bracket 41, so that the distance between the contact point of the protrusion and the rotation point 412 of the depth bracket 41 with respect to the bottom plate 20 is fixed. In this way, the rotation of the housing 11 relative to the bottom plate 20 is guided by the sliding of the protrusion in the groove, so that the swing of the depth bracket 41 can be reduced, and the manufacturing error of the rotation point 412 has less influence on the swing of the depth bracket 41.

Further, the protrusion is disposed at an end of the depth bracket 41 away from the rotation point 412, and a distance between the contact point and the rotation point 412 where the depth bracket 41 rotates relative to the bottom plate 20 is greater than or equal to 50mm and less than or equal to 150 mm. In this way, the influence of manufacturing errors of the rotation point 412 on the swing generated by the depth bracket 41 can be further reduced. In addition, the guide track 118 has a guide trajectory that is an arc of varying curvature.

When the depth bracket 41 is guided only by the sliding rod 42 disposed in the circular hole 411, as shown in fig. 30, if the rotation point 412 generates a manufacturing error of 0.5mm, the depth bracket 41 generates a large swing, and as can be seen from fig. 30, the swing angle generated by the depth bracket 41 is 1.04 degrees. When the depth bracket 41 is guided by the protrusion provided on the depth bracket 41, as shown in fig. 31, if the rotation point 412 generates a manufacturing error of 0.5mm, the depth bracket 41 generates a smaller swing, and as can be seen from fig. 31, the swing angle generated by the depth bracket 41 is 0.32 degrees. It can be seen that the provision of the raised portion eliminates wobbling of the depth bracket 41 caused by manufacturing errors, thereby improving the accuracy of depth indication without increasing the cost or complexity of the structure.

As shown in fig. 2 and 32, the electric circular saw 100 further includes a fastening means 70 for mounting the working attachment 14 to the tool main body 10, wherein the working attachment 14 is formed with a mounting hole 141. Specifically, the working attachment 14 is the saw blade applied to the electric circular saw 100 as described above, and the mounting hole 141 penetrates the saw blade in the direction of the rotational axis 102 of the saw blade.

As shown in fig. 32 to 35, the fastening device 70 includes: the fastening member 71, the clamping member 72, the operating member 73, the rolling member 741, the converting member 75, and the first biasing member 76.

The fastening member 71 includes a fastening portion 711, the fastening portion 711 passes through the mounting hole 141, the fastening portion 711 further extends into the driving shaft 15 and forms a rotational connection with the driving shaft 15, and the fastening portion 711 can drive the whole fastening device 70 to approach or separate from the tool main unit 10 when rotating relative to the driving shaft 15. The clamp 72 is rotatably mounted to the fastener 71, the clamp 72 also being formed with a clamping surface 721 for contact with the work attachment 14. The operating member 73 is for operation by a user, and the operating member 73 and the fastener 71 are configured to rotate in synchronization. The rolling member 741 is provided between the gripping member 72 and the operating member 73, and the rolling member 741 is capable of rolling with respect to the gripping member 72 and the operating member 73. The switching member 75 is also disposed between the clamping member 72 and the operating member 73, and the switching member 75 further has a first position state enabling the clamping member 72 and the operating member 73 to rotate synchronously and a second position state enabling the clamping member 72 and the operating member 73 to rotate relatively. The first biasing member 76 applies a biasing force to the conversion member 75 that moves the conversion member 75 toward the first position state.

Thus, when a user needs to mount or dismount the working attachment 14, the switching member 75 can be brought into the second position state in which the clamping member 72 and the operating member 73 are relatively rotated against the bias of the first biasing member 76, and then the user operates the operating member 73 to drive the fastening member 71 toward a position in which the clamping surface 721 is brought closer to or away from the working attachment 14. At this time, because the clamping member 72 and the operating member 73 are configured to rotate relatively, the force applied to the operating member 73 by the user only needs to overcome the friction force between the fastening member 71 and the driving shaft 15 and the rolling friction force between the rolling member 741 and the clamping member 72 or the operating member 73, and because the rolling friction force is small, the force applied to the operating member 73 by the user mainly overcomes the friction force between the fastening member 71 and the driving shaft 15, so that the user can mount or dismount the working attachment 14 with less effort.

Specifically, the surface of the fastening part 711 is provided with an external thread so that, when the fastening part 711 rotates, it can move in the axial direction of its rotation relative to the drive shaft 15. The fastener 71 further passes through a flat hole 732a formed in the operating member 73, the fastener 71 is provided with a flat portion 712 for engaging with the flat hole 732a, and the operating member 73 and the fastener 71 are rotated synchronously by the engagement of the flat portion 712 and the flat hole 732 a.

The number of the switching members 75 is 2, and two switching members 75 are symmetrically disposed on a side of the clamping member 72 away from the clamping surface 721. Specifically, the converting element 75 has one end rotatably connected to a side of the clamping member 72 away from the clamping surface 721 and the other end connected to the first biasing element 76. The axis of rotation of the converting member 75 relative to the holding member 72 is also parallel to the axis of rotation of the holding member 72 relative to the fastening member 71, and is rotatable to the first position state and the second position state when the converting member 75 is rotated relative to the holding member 72. The holding member 72 is provided with a receiving groove 722 at a side thereof away from the holding surface 721, and the first biasing member 76 is a coil spring disposed in the receiving groove 722, one end of the coil spring abuts against the groove bottom of the receiving groove 722, and the other end abuts against the converting member 75. The operating member 73 and the switching member 75 are respectively formed with a first transmission part 731a and a second transmission part 751 which make the holding member 72 and the operating member 73 rotate synchronously when they are engaged with each other. Specifically, the operation member 73 includes a ring gear portion 731 and an end cap portion 732, and the inner periphery of the ring gear portion 731 is provided with internal teeth, which are the first transmission portion 731 a. Correspondingly, the converting member 75 is further formed with external teeth capable of meshing with the internal teeth of the internal ring gear portion 731, which is the second transmission portion 751.

The operating member 73 is also formed with a driving portion for driving the switching member 75 to move toward the second position state against the bias of the first biasing member 76. Specifically, the operating member 73 is also in sliding connection with the fastener 71 in the axial direction of the rotation of the fastener 71, and the driving portion is a first inclined surface 732b formed at a side of the cover portion 732 close to the clamp 72. Correspondingly, the converting element 75 is formed with a second inclined surface 752 capable of engaging with the first inclined surface 732 b. Thus, when the operating member 73 slides in a direction to approach the clamping member 72, the first inclined surface 732b drives the second inclined surface 752 to move the switching member 75 toward the second position state.

In addition, the rolling member 741 may be a rolling pin in a rolling bearing 74, and the rolling bearing 74 is disposed between the clamp 72 and the operating member 73. A second biasing member 77 is further provided between the operating member 73 and the rolling bearing 74, and the second biasing member 77 applies a biasing force to the operating member 73 to cause it to slide in a direction away from the clamp member 72.

When the working attachment 14 is locked to the driving shaft 15 by the fastening device 70, the second biasing element 77 biases the operating member 73 and makes the operating member 73 be in a position away from the clamping member 72, the first biasing element 76 biases the switching member 75 and makes the switching member 75 be in the first position state, and the first transmission part 731a and the second transmission part 751 are mutually matched, so that the clamping member 72 and the operating member 73 are synchronously rotated, if the user directly rotates the operating member 73 to detach the working attachment 14, the rotating force applied to the operating member 73 by the user needs to overcome not only the frictional force between the fastening member 71 and the driving shaft 15 but also the static frictional force between the clamping member 72 and the working attachment 14, which is large, so that the user needs to take a lot of effort to rotate the operating member 73. In this case, when the user needs to detach the working accessory 14, in fact, the user can press the operating element 73 first, at this time, the first inclined surface 732b and the second inclined surface 752 are matched to drive the converting element 75 to rotate to the second position state, so that the first transmission part 731a and the second transmission part 751 are disengaged, so that the operating element 73 can rotate relative to the clamping element 72, and then the user rotates the operating element 73, at this time, the rotational force applied to the operating element 73 by the user only needs to overcome the friction force between the fastening element 71 and the driving shaft 15 and the rolling friction force between the rolling element 741 and the clamping element 72 or the operating element 73, and because the rolling friction force is small, the force applied to the operating element 73 by the user is mainly used for overcoming the friction force between the fastening element 71 and the driving shaft 15, so that the user can mount or detach the working accessory 14 more easily.

In fact, the fastening device 70 can be used not only for mounting a saw blade to a saw-like tool, but also for mounting a sharpening sheet to an angle grinder, although this is not a limitation.

It should be noted that, if it is not strictly stated that a part of the hole penetrates a part in a certain direction, the hole may be replaced by a groove. That is, in the present case, a part of the grooves may be replaced by holes, and a part of the holes may be replaced by grooves.

The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It should be understood by those skilled in the art that the above embodiments do not limit the present invention in any way, and all technical solutions obtained by using equivalent alternatives or equivalent variations fall within the scope of the present invention.

Claims (12)

1. A hand-held power tool comprising:

a housing;

an output member for outputting power;

a prime mover disposed within the housing;

the method is characterized in that:

the hand-held power tool further includes:

a hook assembly for suspending the hand-held power tool;

the hook assembly includes:

a connector for connecting the hook assembly to the housing;

the hook piece comprises a hook part and a handle part which can rotate relative to the connecting piece by taking a first axis as a shaft;

wherein the connector is movable relative to the housing between at least a first position and a second position; after the connecting piece moves from the first position to the second position, the connecting piece generates rotation relative to the connecting piece and the rotation axis of the connecting piece generates rotation relative to the connecting piece generates displacement.

2. The hand-held power tool of claim 1, wherein:

the shell is provided with an arc-shaped groove, and the connecting piece comprises a moving part which can move in the arc-shaped groove along the extending direction of the arc-shaped groove so as to enable the connecting piece to be located at the first position and the second position.

3. The hand-held power tool of claim 2, wherein:

the arc-shaped groove is an arc-shaped groove, and a central line corresponding to the arc-shaped groove wall of the arc-shaped groove is perpendicular to the first axis.

4. The hand-held power tool of claim 2, wherein:

the connecting piece also comprises a stopping part used for stopping the moving part from being separated from the arc-shaped groove, and the stopping part and the moving part form detachable connection.

5. The hand-held power tool of claim 1, wherein:

the rotation axis of the connecting piece which rotates relative to the connecting piece is perpendicular to the first axis.

6. The hand-held power tool of any one of claims 1 to 5, wherein:

the housing is further formed with:

a main handle portion for being held by one hand of a user;

a sub-handle portion for being held by the other hand of the user;

a connecting portion for connecting the main handle portion and the sub handle portion;

the hook assembly is disposed on the connecting portion and between the main handle portion and the sub-handle portion.

7. The hand-held power tool of claim 6, wherein:

the hand-held power tool is a saw-like tool capable of driving a saw blade to rotate.

8. The hand-held power tool of claim 7, wherein:

the first axis is perpendicular to the rotation axis of the saw blade, and the rotation axis of the connecting piece which rotates relative to the connecting piece is parallel to the rotation axis of the saw blade.

9. A hand-held power tool comprising:

a housing;

an output member for outputting power;

a prime mover disposed within the housing;

the method is characterized in that:

the hand-held power tool further includes:

a hook assembly for suspending the hand-held power tool;

the hook assembly includes:

a connector for connecting the hook assembly to the housing;

the hook piece comprises a hook part and a handle part which can rotate relative to the connecting piece by taking a first axis as a shaft;

the connecting piece and the shell form rotary connection by taking a second axis which is not in the same plane with the first axis as an axis; the second axis is not coincident with the rotation axis of the connector which rotates relative to the connector.

10. The hand-held power tool of claim 9, wherein:

the second axis of rotation of the connector relative to the housing is perpendicular to the first axis.

11. The hand-held power tool of claim 9 or 10, wherein:

the housing is further formed with:

a main handle portion for being held by one hand of a user;

a sub-handle portion for being held by the other hand of the user;

a connecting portion for connecting the main handle portion and the sub handle portion;

the hook assembly is disposed on the connecting portion and between the main handle portion and the sub-handle portion.

12. The hand-held power tool of claim 11, wherein:

the hand-held power tool is a saw-like tool capable of driving a saw blade to rotate.

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