JP2005052908A - Power tool - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To arbitrarily select driving of a tool bit by trigger operation and driving of the tool bit by an operating member separated from the trigger. <P>SOLUTION: The power tool 101 has a striker 131 linearly moving via a motor 111, the tool bit 119 for making predetermined work on a workpiece by the strike input from the striker 131 and the trigger 165 for operating the motor to drive or stop. The power tool is structured to be changed over between a first mode in which the motor is driven or stopped by the operation of the trigger 165 and a second mode in which the motor is driven or stopped by operations of pushing the tool bit 119 against the workpiece or separating it. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an electric tool that performs a chipping operation on a workpiece (concrete) by, for example, hammering operation of a hammer bit.
[0002]
[Prior art]
As an example of the electric tool, German Patent Application Publication No. 19720947 (Patent Document 1) discloses a configuration of a mode switching mechanism in an electric hammer drill.
In the electric hammer drill according to this prior art, when the hammer bit is used as a tool bit that performs a striking operation using a motor as a driving source in the state of switching to the hammer mode, the burden on the operator is reduced. From this point of view, the motor operation trigger is fixed at a closing operation position where the motor power switch is turned on (on state), that is, a so-called trigger lock is enabled.
[0003]
According to the above-described configuration, when the chipping operation is continuously performed in the state in which the mode is switched to the hammer mode, it is possible to obtain an advantage in work that the burden on the operator is reduced with the trigger lock of the trigger. . However, in order to drive the hammer bit by, for example, small increments by trigger operation, it is necessary to release the trigger lock state, and there is still room for improvement in terms of usability.
[0004]
[Patent Document 1]
German Patent Application Publication No. 19720947
[0005]
[Problems to be solved by the invention]
From the above viewpoint, the present invention provides a technique capable of arbitrarily selecting driving of a tool bit by a trigger operation and driving of a tool bit by an operation member different from the trigger in an electric tool. The purpose is that.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the invention described in each claim is configured.
According to the first aspect of the present invention, the striker that linearly moves via the motor, the tool bit that performs a predetermined machining operation on the workpiece by the strike input from the striker, and the motor is driven or stopped. A power tool having a trigger is configured. The “predetermined processing operation” in the present invention typically corresponds to a hammer operation for a workpiece (concrete), but includes operations other than the hammer operation. Moreover, as an aspect of "battery input from a striker" with respect to a tool bit, both the aspect directly input from a striker and the aspect input via an intermediate element are included suitably.
[0007]
In the present invention, the first drive control mode that enables the motor to be driven or stopped by the trigger operation, and the motor to be driven or stopped by the operation of pressing the tool bit against the workpiece or the operation of pulling it away from the workpiece. It is configured to be switchable between the second drive control modes that can be performed.
According to such a configuration, the operator can select a mode according to the form of the work work or the work situation. For example, when the first drive control mode is selected, the machining operation can be performed by arbitrarily driving or stopping the tool bit by a trigger operation. On the other hand, when the second drive control mode is selected, Without performing a trigger operation, the tool bit can be driven or stopped by pressing or pulling the tool bit against the workpiece to perform the machining operation.
In other words, an easy-to-use electric tool that can select a drive control mode according to the form of work and the work situation is provided.
Moreover, when processing a workpiece with a tool bit, the said tool bit is pressed against a workpiece as a natural mode at the time of processing operation. In the present invention, since the tool bit is driven using the pressing operation of the tool bit against the workpiece, there is no waste in the operation and it is useful for improving the operability.
[0008]
(Invention of Claim 2)
According to the second aspect of the present invention, in the electric tool according to the first aspect, the mode switching mechanism for switching the mode between the first drive control mode and the second drive control mode, and the trigger The first switch that is turned on or off by the operation of the above and the second switch that is turned on by the pressing operation of the tool bit against the work material and turned off by the pulling operation away from the work material. And a switch. The motor is configured to be energized and driven on condition that the first switch is on and the second switch is on. Further, when the mode switching mechanism is switched to the first drive control mode, the second switch is turned on and the trigger operation is permitted. When the mode switching mechanism is switched to the second drive control mode, the second switch is turned on. The trigger is moved to the operating position where the first switch is turned on and fixed while being turned off.
[0009]
According to the above configuration, when the mode switching mechanism is operated to switch to the first drive control mode, the second switch is turned on and the trigger operation is allowed. In such a state, the motor can be energized or stopped by operating the trigger to turn the first switch on or off. When the mode switching mechanism is operated to switch to the second drive control mode, the second switch is turned off and the trigger is moved and fixed to the operation position where the first switch is turned on. In such a state, the motor can be energized or stopped by pressing or pulling the tool bit against the workpiece and turning the second switch on or off.
Thus, according to the second aspect of the invention, the first and second switches can be turned on and off by the mode switching mechanism, the trigger, and the tool bit. The machining operation in the mode or the second drive control mode can be arbitrarily selected and executed.
[0010]
(Invention of Claim 3)
According to a third aspect of the present invention, in the electric tool according to the first aspect, in addition to the mode switching between the first drive control mode and the second drive control mode, the tool bit is hit by a striker. Switching to the third drive control mode in which the operation and the rotational movement through the motor are performed is possible. The switching between the first to third modes is performed through a set of mode switching mechanisms.
According to the present invention having such a configuration, in addition to the machining operation in the first drive control mode and the second drive control mode, the predetermined machining is performed in the third drive control mode in which the tool bit performs the striking operation and the rotational motion. Can perform work. The “predetermined machining operation” typically corresponds to a drilling operation, but of course can be applied to operations other than the drilling operation. In the present invention, the mode switching between the first drive control mode, the second drive control mode, and the third drive control mode can be performed by a set of mode switching mechanisms. Thereby, the mode switching operation can be easily performed.
[0011]
(Invention of Claim 4)
According to a fourth aspect of the present invention, in the electric tool according to the third aspect, the first switch that is turned on or off by the operation of the trigger, and the pressing operation of the tool bit to the workpiece A second switch that is turned on by a pulling-off operation from the workpiece, and a clutch mechanism that transmits or cuts off the rotational power of the motor to the tool bit. It is configured to be energized and driven on condition of the ON state of the second switch and the ON state of the second switch.
The mode switching mechanism is configured to include a mode switching operation member, a trigger control member, a switch switching member, and a clutch switching member. The mode switching operation member is arranged outside the machine body and can be switched by an operator. The trigger control member is linked to the mode switching operation member, allows the operation of the trigger based on the switching of the mode switching operation member to the first drive control mode or the third drive control mode, and performs the second drive. Based on the switching to the control mode, the trigger is fixed at the operation position where the first switch is turned on. The switch switching member is linked to the mode switching operation member, turns on the second switch based on switching of the mode switching operation member to the first drive control mode, and switches to the second drive control mode. Based on the above, the second switch is turned off. Further, the clutch switching member is linked to the mode switching operation member, and operates to the side where the clutch mechanism is connected based on the switching of the mode switching operation member to the third drive control mode, so that the first or second driving is performed. Based on the switching to the control mode, the clutch mechanism is operated to be disconnected. By adopting such a configuration, mode switching among the first drive control mode, the second drive control mode, and the third drive control mode can be rationally realized.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to FIGS. In this embodiment, an electric hammer drill will be described as an example of an electric tool. 1 shows the overall configuration of the electric hammer drill, FIG. 2 shows the configuration of the main part, and FIGS. 3 to 6 show the mode switching modes. 3 to 6, the mode switching operation member is shown in plan view above the paper surface. As shown in FIG. 1, an electric hammer drill 101 according to the present embodiment generally includes a main body 103 that forms an outline of the electric hammer drill 101, and a tool holder 117 that is connected to a distal end region of the main body 103. The hammer bit 119 is removably attached to the tool holder 117 as a main component. The hammer bit 119 corresponds to a “tool bit” in the present invention.
[0013]
The main body 103 includes a motor housing 105 that houses the drive motor 111, a gear housing 107 that houses the motion conversion mechanism 113 and the striking element 115, and a hand grip 109. The drive motor 111 corresponds to the “motor” in the present invention. The rotation output of the drive motor 111 is appropriately converted into a linear motion by the motion conversion mechanism 113 and then transmitted to the striking element 115, and the hammer bit 119 passes through the striking element 115 in the major axis direction (left-right direction in FIG. 1). Generates an impact force.
[0014]
The motion conversion mechanism 113 converts the rotational motion of the drive motor 111 into a linear motion and transmits it to the striking element 115, and is constituted by a crank mechanism that is driven via the drive motor 111. In FIG. 1, most of the members constituting the crank mechanism are hidden by the gear housing 107, and the connecting rod 121 and the piston 123, which are the movement end portion side members, are illustrated. The piston 123 constitutes a driver for driving the so-called striking element 115, and can slide in the cylinder 125 in the same direction as the major axis direction of the hammer bit 119.
[0015]
The striking mechanism 115 is slidably disposed on the bore inner wall of the cylinder 125 together with the piston 123, and slidably disposed on the tool holder 117, and transmits the kinetic energy of the striker 131 to the hammer bit 119. The impact bolt 133 is mainly used. The striker 131 corresponds to the “batter” in the present invention. Further, the impact bolt 133 constitutes a “meson”.
[0016]
On the other hand, the tool holder 117 is configured to be rotatable and is configured to be rotated from the drive motor 111 via the power transmission mechanism 141. A clutch mechanism 151 is interposed in the power transmission mechanism 141, and the rotation of the drive motor 111 can be transmitted to or cut off from the tool holder 117 by the clutch mechanism 151. The power transmission mechanism 141 is mainly composed of a plurality of gears, and the clutch mechanism 151 is mainly composed of a meshing-type pawl clutch. Is omitted. The hammer bit 119 is held with respect to the tool holder 117 in a state where relative reciprocation in the major axis direction is possible and relative rotation in the circumferential direction is restricted.
[0017]
The drive motor 111 in the motor housing 105 is energized and driven on condition that the main switch 161 and the sub switch 163 are turned on (turned on), and one or both of the switches 161 and 163 are turned off. It is configured to be stopped when it is set to (non-input state or input release state). The main switch 161 corresponds to the “first switch” in the present invention, and the sub switch 163 corresponds to the “second switch” in the present invention. The on / off operation of the main switch 161 is controlled based on the operation of the trigger 165, and the on / off operation of the sub switch 163 is controlled separately by the operation of the hammer bit 119 or the operation of the mode switching mechanism 181. Is done.
[0018]
The trigger 165 is attached to the handgrip 109 so as to be rotatable about a rotation center 165a, and the main switch 161 is turned on by a pulling operation by an operator, and the main switch 161 is turned off by releasing the pulling operation. To do.
[0019]
In the electric hammer drill 101, when the hammer bit 119 is pressed against a workpiece (not shown for convenience), the slide sleeve 167 moves toward the hand grip 109 via the impact bolt 133 and the buffer stopper 135, that is, is retracted. (Refer to FIG. 5) When the hammer bit 119 is pulled away from the workpiece, the above-described members are returned to their original positions by the spring 169 (see FIG. 4). In this embodiment, the switch operating member 171 is attached to the slide sleeve 167, the sub switch 163 is turned on (see FIG. 5) by the backward operation of the switch operating member 171, and the return operation (forward operation) of the switch operating member 171 is performed. ), The sub switch 163 is turned off (see FIG. 4).
[0020]
The electric hammer drill 101 includes a mode switching mechanism 181 that switches the operation mode of the hammer bit 119. The mode switching mechanism 181 includes a hammer mode that enables the hammer bit 119 to perform a striking operation based on the operation of the trigger 165, and the hammer bit 119 operates the hammer bit 119 while the trigger 165 is pulled and fixed at the operation position. It is possible to switch between a trigger lock mode that enables a hammering operation based on the hammer drill mode and a hammer drill mode that enables the hammer bit 119 to perform a hammering operation and a rotating operation. The hammer mode corresponds to the “first drive control mode” in the present invention, the hammer lock mode corresponds to the “second drive control mode” in the present invention, and the hammer drill mode corresponds to the “third drive control mode” in the present invention. ".
The state switched to the hammer mode is shown in FIG. 3, the state switched to the trigger lock mode is shown in FIGS. 4 and 5, and the state switched to the hammer drill mode is shown in FIG. 4 shows a state where the hammer bit 119 is not pressed against the workpiece, that is, a standby state, and FIG. 5 shows a bit pressed state where the hammer bit 119 is pressed against the workpiece.
[0021]
The mode switching mechanism 181 mainly includes a mode switching operation member 183, a trigger control member 185, a switch switching member 187, and a clutch switching member 189. The mode switching operation member 183 is disposed on the gear housing 107 so as to be operable from the outside. The gear housing 107 corresponds to the “airframe” in the present invention. The mode switching operation member 183 is attached to the gear housing 107 so as to be rotatable in a horizontal plane, and on the outer surface side of the gear housing 107, the disc 183a and the operation grip extending in the diameter direction on the upper surface of the disc. It is set as the structure provided with 183b. One end of the grip 183b in the extending direction is formed in a tapered shape, thereby forming a switching position instruction portion 183c. In addition, on the outer surface of the gear housing 107, marks (not shown) indicating the three kinds of mode positions, that is, the hammer mode position, the trigger lock mode position, and the hammer drill mode position are marked at intervals of about 90 degrees in the circumferential direction. Yes.
[0022]
The trigger control member 185 is disposed substantially horizontally in the gear housing 107 and has one end linked to the mode switching operation member 183, the other end extending toward the trigger 165, and the trigger 165 upper end. Opposing to pressurize. A circular eccentric cam portion 183d centered at a position offset by a predetermined distance from the rotation center of the mode switching operation member 183 is formed on the inner surface side of the gear housing 107 of the mode switching operation member. One end of the trigger control member 185 is fitted in a loose fit. As a result, the trigger control member 185 is movable in the extending direction through the eccentric cam portion 183d based on the rotation operation of the mode switching operation member 183.
[0023]
As shown in FIGS. 4 and 5, the trigger control member 185 is moved to the hand grip 109 side (the right side in the drawing) when the mode switching operation member 183 is rotated to the trigger lock mode position, and the tip portion Thus, the upper end of the trigger 165 is pressurized, and the trigger 165 is tilted to the pull operation position where the main switch 161 is turned on and fixed (locked) to the pull operation position. Further, as shown in FIGS. 3 and 6, the trigger control member 185 moves to the distal end side (the left side in the drawing) of the hammer bit 119 when the mode switching operation member 183 is rotated to the hammer mode position or the hammer drill mode position. Then, the trigger 165 is unlocked and the trigger 165 is allowed to be operated by the operator.
[0024]
The switch switching member 187 is arranged substantially horizontally in the gear housing 107, one end is linked to the mode switching operation member 183, and the other end extends toward the sub switch 163 side installed in the gear housing 107. Be present. An eccentric pin 183e projects from the end face of the mode switching operation member 183 on the inner surface side of the gear housing 107 at a position offset by a predetermined distance from the rotation center of the mode switching member 183, and the switch switching member is provided on the eccentric pin 183e. One end of 187 is fitted in a loose fit. Thereby, the switch switching member 187 can be moved in the extending direction via the eccentric pin 183e based on the rotation operation of the mode switching operation member 183.
[0025]
As shown in FIG. 3 or FIG. 6, the switch switching member 187 moves to the hand grip 109 side (the right side in the figure) when the mode switching operation member 183 is rotated to the hammer mode position or the hammer drill mode position. When the sub switch 161 is turned on via the switch operating piece 187a and the mode switching operation member 183 is rotated to the trigger lock mode position as shown in FIGS. 4 and 5, the tip end side of the hammer bit 119 ( The sub-switch 163 is turned off.
[0026]
The clutch switching member 189 is joined to the driven-side clutch body 155 in the clutch mechanism 151 while extending substantially horizontally toward the clutch mechanism 151 side while being joined to the distal end portion of the switch switching member 187. The switch switching member 187 can be moved integrally. As shown in FIG. 6, the clutch switching member 189 moves to the hand grip 109 side (right side in the figure) when the mode switching operation member 183 is rotated to the hammer drill mode position, and the driven clutch body 155 is pivoted. The claw of the driven side clutch body 155 is engaged with the claw of the drive side clutch body 153 by moving in the direction. As shown in FIGS. 3 to 5, the clutch switching member 189 moves to the distal end side (the left side in the drawing) of the hammer bit 119 when the mode switching operation member 183 is rotated to the hammer mode position or the trigger lock mode position. The claw of the driven clutch body 155 is moved away from the claw of the drive side clutch body 153.
[0027]
The electric hammer drill 101 according to the present embodiment is configured as described above. Next, the operation and usage of the electric hammer drill 101 will be described.
When the operator rotates the mode switching operation member 183 from, for example, the trigger lock mode position shown in FIGS. 4 and 5 to the hammer mode position shown in FIG. 3, the trigger control member 185 moves to the tip side of the hammer bit 119. The trigger 165 is unlocked. That is, the operator is allowed to operate the trigger 165 and the main switch 161 is turned off. On the other hand, the switch switching member 187 is moved to the hand grip 107 side, and the sub switch 163 is turned on via the switch operating piece 187a. The clutch switching member 189 also moves to the handgrip 107 side, and the moving position at that time is approximately the middle position in the moving range. Therefore, the pawl of the driven side clutch body 155 is connected to the driving side clutch body 153. The clutch mechanism 151 is maintained in a disconnected state without engaging with the claws.
[0028]
Therefore, if the trigger 165 is pulled and the main switch 161 is turned on in the state shown in FIG. 3 when the mode is switched to the hammer mode, the drive motor 111 is driven, and the rotational motion of the drive motor 111 is caused by the motion conversion mechanism 113. It is converted into a linear motion, and the piston 123 of the motion conversion mechanism 113 performs a reciprocating linear motion in the bore of the cylinder 125.
Along with the linear motion of the piston 123, the striker 131 linearly moves toward the impact bolt 133 at a speed higher than the speed of the linear motion of the piston 123 by the action of a so-called air spring. When the striker 131 collides with the impact bolt 133, the kinetic energy of the striker 131 is transmitted to the impact bolt 133, and the impact bolt 133 moves linearly toward the hammer bit 119 at a high speed. When the impact bolt 133 collides with the hammer bit 119, the kinetic energy of the impact bolt 133 is transmitted to the hammer bit 119, and the hammer bit 119 linearly moves forward at a high speed. That is, the hammer bit 119 performs a hammering operation (hammer operation), so that a hammering operation such as chipping is performed. When the pulling operation of the trigger 165 is released, the main switch 161 is turned off, and the drive motor 111 and the hammer bit 19 are stopped.
[0029]
Next, when the mode switching operation member 183 is rotated, for example, from the hammer mode position shown in FIG. 3 to the trigger lock mode position shown in FIG. 4, the trigger control member 185 is moved to the handgrip 109 side, and the trigger 165 Pressurize the top. As a result, the trigger 165 tilts to the pulling operation position to turn on the main switch 161 and is fixed at that position. That is, the trigger lock state is established. On the other hand, since the switch switching member 187 is moved to the tip side of the hammer bit 119, the switch operating piece 187a is separated from the sub switch 163, and the sub switch 163 is turned off. Further, since the clutch switching member 189 is also moved to the hammer bit 119 side, the claw of the driven clutch body 155 does not mesh with the claw of the drive side clutch body 153, and the clutch mechanism 151 is maintained in a disconnected state.
[0030]
In this state, when the hammer bit 119 is pressed against the workpiece, the hammer bit 119 moves backward, that is, moves toward the hand grip 109 as shown in FIG. Along with this, the slide sleeve 167 moves backward via the impact bolt 133 and the buffer stopper 135, and the sub switch 163 is turned on by the switch operating member 171 attached to the slide sleeve 167. As a result, the drive motor 111 is energized and the hammer bit 119 strikes through the motion conversion mechanism 113 and the striking element 115 as in the above-described hammer mode, so that a hammering operation such as a chisel is performed. It will be. When the hammer bit 119 is pulled away from the workpiece, each member is returned to the original position shown in FIG. 4, that is, the standby state by the spring 169, and accordingly, the sub switch 163 is turned off. 111 and the hammer bit 119 are stopped. At this time, since the trigger 165 is in the trigger lock state fixed at the pulling operation position, it is not necessary to operate the trigger 165 at all and the hammering operation can be easily performed.
[0031]
Next, when the mode switching operation member 183 is rotated from the hammer mode position shown in FIG. 3 or the trigger lock mode position shown in FIG. 4 to the hammer drill mode position shown in FIG. 6, the trigger control member 185 moves to the hammer bit 119 side. That is, the trigger 165 is moved away from the trigger 165 to release the trigger 165 from being fixed. The trigger 165 is normally biased to the off operation side of the main switch 161, and returns to the off operation side of the main switch 161 when the trigger control member 185 releases the fixation. For this reason, the main switch 161 is turned off, and the trigger 165 can be operated by the operator. On the other hand, the switch switching member 187 is moved to the hand grip 109 side, and the sub switch 163 is turned on via the switch operating piece 187a. The clutch switching member 189 also moves to the hand grip 109 side to move the driven side clutch body 155 in the same direction, and the claw of the driven side clutch body 155 is engaged with the claw of the driving side clutch body 153. That is, the clutch mechanism 151 is connected.
[0032]
In this state, when the operator pulls the trigger 119 and turns on the main switch 161, the drive motor 111 is energized. The rotational output of the drive motor 111 is transmitted to the tool holder 117 via the power transmission mechanism 141 to which the clutch mechanism 151 is connected. That is, the hammer bit 119 simultaneously performs a striking operation (hammer operation) via the motion conversion mechanism 113 and the striking element 115 and a rotation operation (drilling operation) via the power transmission mechanism 141. Therefore, in the hammer drill mode, a hammer drill operation such as drilling is performed by the combined operation of the hammering operation and the rotation operation of the hammer bit 119.
[0033]
As described above, according to the present embodiment, the hammer work by operating the trigger 165 in the hammer mode and the hammer work by operating the hammer bit 119 in the trigger lock mode are arbitrarily selected. Can be carried out. That is, depending on the situation of the chipping work on the spot, the worker may perform either the chipping work on the workpiece continuously or the hammer bit 119 is operated in small increments depending on the situation of the chipping work on the spot. It is possible to appropriately select whether to drive the hammer bit 119 by the above operation method, and the electric hammer drill 101 that is easy to use is provided.
[0034]
The hammer work in the trigger lock mode in which the hammer bit 119 is operated to drive or stop the hammer bit 119, that is, the work form in which the hammer bit 119 is pressed or pulled away from the workpiece is naturally performed when the hammer work is performed. This is a work form. For this reason, when performing the drive control of the hammer bit 119, using the hammer bit 119 directly is effective in streamlining the work.
In the present embodiment, when the hammer bit 119 is operated to control the driving / stopping of the driving motor 111, the trigger 165 is fixed to the pulling operation position where the main switch 161 is turned on. It is not necessary to continue to pull the trigger 165, which is effective in reducing the labor of the operator when the chipping operation is continuously performed.
[0035]
In this embodiment, in addition to hammering work in two hammer modes with different operation methods, hammer drilling work in hammer drill mode is possible, and mode switching in that case is realized by one type of mode switching mechanism 181. ing. Specifically, in addition to turning on / off the two switches, that is, the main switch 161 and the sub switch 163, the clutch connection / disconnection operation is performed by rotating the single mode switching operation member 183. It has been realized. For this reason, the operability is improved and the structure can be simplified as compared with a case where a plurality of mode switching operation systems are provided, for example.
[0036]
In the present embodiment, an electric hammer drill has been described as an example of an electric tool. However, the invention can also be applied to an electric hammer in which the hammer bit 119 performs only a striking operation.
In the present embodiment, in the configuration in which the hammer bit 119 is pressed against the workpiece and the hammer bit 119 is driven, the trigger 165 for turning the main switch 161 on and off is a pulling operation that turns the main switch 161 on. However, instead of this configuration, the hammer bit 119 is driven when the operator pushes the trigger 165 and presses the hammer bit 119 against the workpiece. Regardless of the configuration or the presence or absence of the pulling operation of the trigger 165, the hammer bit 119 may be driven to be driven only by pressing the hammer bit 119 against the workpiece.
[0037]
In view of the gist of the invention, the following aspects can be configured.
(Aspect 1)
“A power tool having a striker that linearly moves via a motor, and a tool bit that performs a predetermined machining operation on the workpiece by hitting input from the striker, and the workpiece of the tool bit. An electric tool characterized in that the tool bit is driven by the operation of pressing the motor through the motor. "
According to the above configuration, the tool bit is driven by the pressing operation of the tool bit against the workpiece, which is a natural work mode performed by the worker when performing the hammer work, for example, the hammer work or the like. Can be done easily. In the stop state where the tool bit is separated from the workpiece, the motor is also stopped, which is effective in terms of energy saving.
[0038]
【The invention's effect】
As described above in detail, according to the present invention, in the electric tool, a technique capable of arbitrarily selecting driving of a tool bit by a trigger operation and driving of a tool bit by an operation member different from the trigger is provided. Can be provided.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing an overall configuration of an electric hammer drill according to an embodiment.
FIG. 2 is a cross-sectional view showing a configuration of a main part.
FIG. 3 is a diagram showing a state in which the electric hammer drill is switched to a hammer mode.
FIG. 4 is a diagram showing a state in which the electric hammer drill is switched to a trigger lock mode, and shows a standby state in which the hammer bit is not pressed against the workpiece.
FIG. 5 is a diagram showing a state in which the electric hammer drill is switched to a trigger lock mode, and shows a driving state in which a hammer bit is pressed against a workpiece.
FIG. 6 is a diagram showing a state in which the electric hammer drill is switched to a hammer drill mode.
[Explanation of symbols]
101 Electric hammer drill (electric tool)
103 Main body
105 Motor housing
107 Gear housing (airframe)
109 hand grip
111 Drive motor (motor)
113 Motion conversion mechanism
115 Stroke element
117 Tool holder
119 Hammer Bit (Tool Bit)
121 connecting rod
123 Piston (Driver)
125 cylinders
131 striker
133 Impact bolt (meson)
135 Buffer stopper
141 Power transmission mechanism
151 Clutch mechanism
153 Drive side clutch body
155 Drive side clutch body
161 Main switch (first switch)
163 Sub switch (second switch)
165 trigger
167 Slide sleeve
169 Spring
171 Switch actuating member
181 Mode switching mechanism
183 Mode switching operation member
183a disc
183b grip
183c Switching position instruction section
183d Eccentric cam
183e Eccentric pin
185 Trigger control member
187 Switch switching member
189 Clutch switching member

Claims (4)

An electric tool having a striker that linearly moves via a motor, a tool bit that performs a predetermined machining operation on a workpiece by a strike input from the striker, and a trigger that drives or stops the motor. ,
The first drive control mode that enables the motor to be driven or stopped based on the operation of the trigger, and the pressing operation of the tool bit against the workpiece or the pulling operation away from the workpiece. A power tool configured to be switchable between a second drive control mode that enables driving or stopping of a motor. The electric tool according to claim 1,
A mode switching mechanism for switching the mode between the first drive control mode and the second drive control mode;
A first switch that is turned on or off by the operation of the trigger;
A second switch that is turned on by the pressing operation of the tool bit against the workpiece and turned off by the workpiece separating operation;
The motor is configured to be energized and driven on condition of the on state of the first switch and the on state of the second switch,
When the mode switching mechanism is switched to the first drive control mode, the second switch is turned on and the operation of the trigger is allowed. When the mode switching mechanism is switched to the second drive control mode, An electric tool characterized in that the second switch is turned off and the trigger is moved and fixed to an operation position where the first switch is turned on. The electric tool according to claim 1,
In addition to mode switching between the first drive control mode and the second drive control mode, the tool bit performs a striking operation by the striking element and a rotating motion through the motor. The drive control mode can be switched, and switching between the first to third modes is performed through a set of mode switching mechanisms. tool. The electric tool according to claim 3,
A first switch that is turned on or off by the operation of the trigger;
A second switch that is turned on by a pressing operation of the tool bit to the workpiece, and turned off by a pulling operation from the workpiece;
A clutch mechanism that transmits or shuts off the rotational power of the motor to the tool bit, and
The motor is configured to be energized and driven on condition of the on state of the first switch and the on state of the second switch,
The mode switching mechanism is
A mode switching operation member arranged outside the aircraft,
Linked to the mode switching operation member, the operation of the trigger is permitted based on switching of the mode switching operation member to the first drive control mode or the third drive control mode, and the mode is changed to the second drive control mode. A trigger control member for fixing the trigger to an operation position for turning on the first switch based on switching of
Linked to the mode switching operation member, the second switch is turned on based on switching of the mode switching operation member to the first drive control mode, and based on switching to the second drive control mode. A switch switching member for turning off the second switch;
Linked to the mode switching operation member, the mode switching operation member is operated to the side to connect the clutch mechanism based on switching to the third drive control mode, and the first drive control mode or the second drive An electric tool comprising: a clutch switching member that operates to disengage the clutch mechanism based on switching to a control mode.

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