JP2010234503A - Power tool - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To restrain a forward and reverse switching lever from getting caught by fingers holding a grip. <P>SOLUTION: The power tool has: a motor; a housing storing the motor; a front end tool rotated by the motor, and equipped in the front of the housing; and a forward and reverse switching lever to operate the front end tool so that it is rotated in a forward or reverse direction. The lever is equipped in the housing so that it moves forward and backward. Thus the problem is solved. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a power tool. In particular, the present invention relates to an electric tool having a tip tool, which has a switching lever capable of switching the rotation direction of the tip tool to rotation in one direction or rotation in the other direction.

The structure of a conventional electric power tool is disclosed in, for example, Japanese Patent Laid-Open No. 5-301179 of Patent Document 1. This will be described using JP-A-5-301179.
The portable electric tool is provided with a forward / reverse switching lever 4 on a button 2 for switching forward / reverse rotation of the motor. When the operator pushes the button 2 in the vertical direction in FIG. 3, the lever 4 moves so that the rotation of the motor can be switched.

JP-A-5-301179

  In the configuration of Patent Document 1, when the operator pulls the trigger with the middle finger, the finger may be caught on the button 2. For this reason, even when the trigger is pulled with the middle finger, if there is a button that does not get caught by the finger, the operator can work without worrying about the button, and workability is improved.

  In addition, when the button is configured to protrude from the portable electric tool, for example, there is a case where forward / reverse switching unintended by the operator is performed when the button collides with a wall or a floor.

  An object of the present invention is to provide an electric tool with good workability. It is another object of the present invention to provide an electric tool in which forward / reverse switching unintended by an operator is rarely performed.

  As claimed in claim 1 of the present invention, a motor, a housing that houses the motor, a tip tool that is rotationally driven by the motor and is provided in front of the housing, An electric tool having a forward / reverse switching lever that can be operated so as to rotate in a reverse direction, wherein the forward / reverse switching lever is provided in a housing so as to be movable back and forth. Can be solved.

  Further, according to claim 1 of the present invention, a motor, a housing that houses the motor, a tip tool that is rotationally driven by the motor and is provided in front of the housing, and the tip tool A forward / reverse switching lever that can be rotated so as to rotate or reversely rotate, wherein the forward / reverse switching lever is rotatably provided in the housing. The purpose of can be solved.

  According to a first aspect of the present invention, a motor, a housing that houses the motor, a tip tool that is rotationally driven by the motor and is provided in front of the housing, and the tip tool is normally rotated. Or a forward / reverse switching lever that can be rotated so as to be reversely rotated, wherein the forward / reverse switching lever is provided in a housing so as to be movable forward and backward. Since the portion where the reverse switching lever protrudes from the housing is small, the finger is less likely to hit the forward / reverse switching lever when the operator holds the power tool. For this reason, the worker can work comfortably.

  According to a second aspect of the present invention, the forward / reverse switching lever is provided with a hook, and the hook is movable back and forth with respect to the housing. According to the first aspect of the present invention, since the entire forward / reverse switching lever does not have to be moved backward, the housing can be made compact.

  According to a third aspect of the present invention, a motor, a housing that houses the motor, a tip tool that is rotationally driven by the motor and is provided in front of the housing, and the tip tool is rotated forward. Or a forward / reverse switching lever that can be rotated so as to rotate in the reverse direction, wherein the forward / reverse switching lever is rotatably provided on the housing. Since the forward / reverse switching operation can be performed by rotating the reverse switching lever, the size in the left / right direction is smaller than that in which the forward / reverse switching lever extends in the left / right direction. For this reason, the forward / reverse switching lever is less likely to hit the finger.

According to a fourth aspect of the present invention, the forward / reverse switching lever is exposed from the left-right direction of the housing. Since the reverse switching lever can be operated, an electric tool with good workability for the operator can be obtained.

1 is an external view of an electric impact driver showing an embodiment of an electric power tool of the present invention. The external view which shows an example of the working state by the operator of the electric impact driver which shows one Embodiment of the electric tool of this invention Partial sectional view of FIG. Plan view of the trigger switch of FIG. 1 is a plan view showing a neutral state of the forward / reverse switching lever in the AA cross section of FIG. FIG. 1 is a plan view showing the forward / reverse switching lever in a forward rotation state along the section AA in FIG. FIG. 1 is a cross-sectional view showing a reverse rotation state of the forward / reverse switching lever in the AA cross section of FIG. BB sectional view of FIG. The perspective view of the forward / reverse switching lever constituting the present invention

  An embodiment of an electric power tool according to the present invention will be described with reference to FIGS.

  As an embodiment of the electric tool, an electric impact driver 1 is used.

  FIG. 1 is an external view of an electric impact driver showing an embodiment of the electric tool of the present invention, and FIG. 2 shows an example of a working state by an operator of the electric impact driver showing an embodiment of the electric tool of the present invention. FIG. 3 is a partial cross-sectional view of FIG. 1, FIG. 4 is a plan view of the trigger switch of FIG. 1, and FIG. 5 is a cross-section AA of FIG. 6 is a plan view showing the forward / reverse switching lever in the forward rotation state in the AA cross section of FIG. 1. FIG. 7 is a sectional view of the forward / reverse switching lever in the reverse rotation state in the AA cross section of FIG. 8 is a cross-sectional view taken along the line BB in FIG. FIG. 9 is a perspective view of the forward / reverse switching lever.

  FIG. 1 is an external view of an electric impact driver showing an embodiment of the electric tool of the present invention. The electric impact driver 1 has a housing 2. The housing 2 is provided in a motor housing 2A for accommodating a motor, which will be described later, a hammer case housing 2D provided in front of the motor housing 2A, a grip housing 2B extending downward from the motor housing 2A, and a lower portion of the grip housing 2B. And a storage battery connection housing 2C to which the storage battery can be connected. The motor housing 2A, the grip housing 2B, and the storage battery connection housing 2C are made of an integrally molded resin that is divided into two in the left-right direction. The hammer case housing 2D is made of a substantially cylindrical metal such as aluminum.

  In front of the hammer case housing 2D, a tip tool holding portion 3 for holding a bit 18 (described later) in a detachable manner is provided. A front cap 6 made of elastic rubber is provided at the front of the hammer case housing 2D. A light 7 described later is provided inside the front cap 6.

  A forward / reverse switching lever 21 is provided near the lower portion of the motor housing 2A. The forward / reverse switching lever 21 is provided so that a part thereof protrudes from the left-right direction of the motor housing 2A.

  A trigger 5 is provided near the upper portion of the grip housing 2B. A part of the trigger 5 can enter and exit the grip 2B.

  Below the storage battery connection housing 2C, the storage battery 4 is detachably attached to the storage battery connection housing 2C. The storage battery 4 has an operation unit 4A. When the operation unit 4A is operated, the storage battery 4 can be fixed to the storage battery connection housing 2C, or the fixing can be released.

  FIG. 2 is an external view showing an example of a working state by an operator of an electric impact driver showing an embodiment of the electric tool of the present invention.

  The operator's right hand R mainly grips the grip housing 2B. As shown in FIG. 2, there is a case in which the grip housing is gripped by a thumb, ring finger R4, and little finger R5 (not shown), the trigger 5 is operated by the middle finger R3, and the motor housing 2A is held by the index finger R2. In such a method of use, since the motor housing 2A is held by the index finger R2, the operator can stably act.

  As another method, it is possible to hold the grip housing with the thumb, middle finger, ring finger, and little finger and operate the trigger with the index finger.

  As shown in FIG. 2, the positional relationship is such that the index finger R2 and the forward / reverse switching lever 21 overlap.

  FIG. 3 shows a partial cross-sectional view of FIG.

  A brushless DC motor 4 driven by electricity is accommodated in the motor housing 2A. In addition, a speed reduction mechanism described later is accommodated in the motor housing 2A. In addition, an impact mechanism section described later is accommodated in the motor housing 2A and the hammer case housing 2D.

  The brushless DC motor 4 has a stator 4 fixed to the motor housing 2A. The stator 4 includes a stator core 4A and a stator coil 4A1 that is fixed by being wound around the stator core 4A via an insulator. A concave portion (not shown) is provided on the outer periphery of the stator core 4A, and a convex portion (not shown) is provided on the inner peripheral surface of the motor housing to engage with the concave and convex portions. By this uneven engagement, the stator 4 is fixed inside the motor housing 2A.

  Inside the stator 4, a rotor 4B is rotatably provided. Four permanent magnets 4B1 are fixed to the rotor 4B. The rotor 4B is provided with a hole (not shown), and a permanent magnet is inserted into the hole and fixed by an adhesive.

  The rotor 4B is fixed to the rotor shaft 4C. The rotor shaft 4C is a rotating shaft of the rotor 4B. A rotor front bearing 4C2 is provided in front of the rotor shaft 4C. A rotor rear bearing 4C1 is provided behind the rotor shaft 4C.

  The rotor rear bearing 4C1 is fixed to a recess provided at the rear of the motor housing 2A. The rotor front bearing 4C2 is fixed to the motor housing 2A via a resin inner cover 8.

  A cooling fan 7 is provided in front of the rotor 4B of the rotor shaft 4C and behind the front bearing 4C2. The cooling fan 7 is fixed to the rotor shaft 4C.

  A pinion 10 is provided at the front portion of the rotor shaft 4C. The rotor shaft 4C and the pinion 10 are fixed so as not to rotate. The pinion 10 has teeth and acts as a gear.

  The inner cover 8 is provided with a spindle bearing 9 for holding the spindle 13 rotatably with respect to the inner cover.

  Two planetary gears 11 are provided so as to mesh with the pinion 10. Further, a ring gear 12 having a circular inner periphery is provided so as to mesh with the planetary gear 11. The ring gear 12 has a concave portion that engages with a convex portion on the inner peripheral surface of the hammer case housing 2D, and is fixed by concave and convex engagement. The planetary gear 11 is rotatably held on the spindle 13.

  Thus, the pinion 10, the planetary gear 11, and the ring gear 12 are referred to as a speed reduction mechanism unit.

  The spindle 13 has a groove and a ball 15 is inserted into the groove. Further, the hammer 16 is also grooved, and the balls 15 described above are inserted therein. A coil spring 14, which is a metal elastic body, is provided between the spindle 13 and the hammer 16.

  A protrusion is provided in front of the hammer 16. An anvil 17 having a protrusion that engages with the protrusion is provided in front of the hammer 16. The anvil 17 is rotatably held inside the hammer case housing 2D by a metal bearing (containing bearing containing oil) provided inside the hammer case housing 2D.

  As described above, the spindle 13, the coil spring 14, the ball 15, the hammer 16, and the anvil 17 are referred to as a hitting mechanism portion.

  The tip tool holding portion 3 described above is provided in front of the anvil 17. The tip tool holding unit 3 is also called a chuck or the like. The tip tool holding unit 3 can be operated, and the bit 18 indicated by a dotted line can be fixed to the anvil 17 or can be released by operating.

  A light 7 is fixed to the hammer case housing 2D. The front of the light 7 is covered with a front cap 6.

  As shown in the drawing, the rear of the hammer case housing 2D is configured to be partially covered by the motor housing 2A.

  A recess is provided in the lower part of the hammer case housing 2D. A protrusion 21B extending upward from the forward / reverse selector switch 21 engages with the recess. The forward / reverse selector switch 21 is rotatably held inside the motor housing 2A by the protrusion 21B and the recess. Further, the forward / reverse selector switch 21 is provided with a catch 21A at the left and right positions thereof.

  Behind the trigger 5, a trigger switch unit 5A operated by the trigger 5 is provided. The trigger switch unit 5A enables energization from the storage battery 4 to the motor 4.

  A circuit board 19 is provided inside the storage battery connecting portion 2C. The circuit board is provided with a switching element for energizing the coil, a microcomputer, and the like. A terminal 20 is provided so as to extend downward from the storage battery connecting portion 2C. Terminal 20 is connected to a terminal connection portion of storage battery 4. The power from the storage battery 4 is supplied by the terminal 20.

  FIG. 4 is a plan view of the trigger switch of FIG. A rotation shaft 5C and a trigger bar portion 5B that rotates about the rotation shaft 5C are provided. The trigger bar can be set to three positions in Turkey. In the first position, the circuit can be configured to rotate the motor 4 in one direction. In the second position, the circuit can be configured to rotate the motor 4 in the direction opposite to the one direction described above. Note that the trigger 5 cannot be pulled at the third position.

  FIG. 5 is a plan view showing a neutral state of the forward / reverse switching lever in the AA cross section of FIG. This neutral state is a state in which the trigger bar portion 5B is in the third position. In this state, the trigger bar portion 5 </ b> B comes into contact with the wall portion provided on the trigger 5. For this reason, even if the operator tries to pull the trigger 5, it cannot be pulled.

  FIG. 6 is a plan view showing the forward / reverse switching lever in a forward rotation state in the AA cross section of FIG. In this normal rotation state, the trigger bar portion 5B is positioned in the right direction. This is a state in which the trigger bar portion 5B is located at the first position described above. From the state of FIG. 5, the operator hooks his / her finger on the catch 21 </ b> A and turns the forward / reverse switching lever 21 to the state of FIG. 6. When the forward / reverse switching lever 21 is rotated, the hook 21A1 on the right side of the forward / reverse switching lever 21 is pushed backward. In this way, by pushing the right hook 21A1 of the forward / reverse switching lever 21 backward, the right hook 21A1 moves backward.

  FIG. 7 is a plan view showing a reverse rotation state of the forward / reverse switching lever in the AA cross section of FIG. In this reverse state, the trigger bar 5B is located on the left. This is a state in which the trigger bar portion 5B is located at the second position described above. From the state of FIG. 5, the operator hooks his / her finger on the catch 21 </ b> A and turns the forward / reverse switching lever 21 in the opposite direction to the state of FIG. 6 to obtain the state of FIG. 6. When the forward / reverse switching lever 21 is rotated, the left catch 21A2 of the forward / reverse switching lever 21 is pushed backward. By pushing the forward / reverse switching lever 21 rearward in this way, the left catch 21A2 moves rearward.

  8 is a cross-sectional view taken along the line BB in FIG.

  Although a part of the forward / reverse switching lever 21 protrudes from the motor housing 2A, the protruding amount is very small. For this reason, even when the index finger R2 of the right hand of the worker contacts the forward / reverse switching lever 21, the worker is less likely to consider the forward / reverse switching lever 21 as an obstacle, and the workability is improved.

  FIG. 9 is a perspective view of the forward / reverse switching lever.

  A protrusion 21 </ b> B extending upward from the forward / reverse selector switch 21 is provided. Further, two catches 21A extending in the left-right direction are provided. A hole portion 21C that engages with the trigger rod portion 5B is provided.

  The operation of the electric impact driver 1 configured as described above will be described. As shown in FIG. 2, when the operator pulls the trigger 5 while holding the electric impact driver 1, the stator coil 4 </ b> A <b> 1 is energized from the storage battery 4 via the trigger switch unit 5 </ b> A. When the stator coil 4A1 is energized, the rotor 4B rotates with respect to the stator 4A by electromagnetic action with the permanent magnet 4B1 of the rotor 4B. The rotor shaft 4C, the cooling fan 7, and the pinion 10 that are fixed to the rotor 4B also rotate.

  The cooling fan 7 takes air from the outside of the motor housing 2A into the motor housing 2A by rotating. And the motor 4 is cooled with the taken-in air. The taken-in air that has cooled the motor is then discharged to the outside of the motor housing 2A.

  As the pinion 10 rotates, the planetary gear 11 rotates. The spindle 13 on which the planetary gear 11 is fixed also rotates. The ball 15 moves to the rear of the spindle 13 by the rotation of the spindle 13. The ball 15 moves the hammer backwards against the elastic force of the coil spring 14.

  At this time, the projection in front of the hammer 16 strikes the projection of the anvil 17, so that a shocking impact is transmitted to the anvil 17. The bit 18 can be tightened with a screw or the like by the impact in the rotating direction. At this time, the forward / reverse switching lever 21 is located as shown in FIG.

  If it is desired to loosen the tightened screw, it is necessary to rotate the forward / reverse switching lever 21 as shown in FIG.

  The pulled trigger 5 is returned to one end, a finger is hooked on the hook 21A, and the forward / reverse switching lever 21 is rotated counterclockwise around the protrusion 21B. As a result, the trigger bar portion 5B is positioned on the left side, and the motor 4 can be reversed.

  In one embodiment of the present invention, the power is supplied to the motor by the storage battery. However, an offensive power may be supplied to the motor by the AC power source.

  In one embodiment of the present invention, an electric impact driver is used as the electric tool, but a hallway driver drill, vibration drill (vibration drill), drill, or the like may be used.

DESCRIPTION OF SYMBOLS 1 Electric impact driver 2 Housing 3 Tip tool holding part 4 Storage battery 5 Trigger 6 Front cap 7 Light 8 Inner cover 9 Spindle bearing 10 Pinion 11 Planetary gear 12 Ring gear 13 Spindle 14 Coil spring 15 Ball 16 Hammer 17 Anvil 18 Bit 19 Circuit board 20 Terminal

Claims (4)

A motor,
A housing for housing the motor;
A tip tool that is rotationally driven by the motor and provided in front of the housing;
A forward / reverse switching lever that can be rotated so as to rotate the tip tool forward or backward,
An electric tool characterized in that the forward / reverse switching lever is provided in a housing so as to be movable back and forth. The forward / reverse switching lever is provided with a hook,
The power tool according to claim 1, wherein the hook is movable back and forth with respect to the housing. A motor,
A housing for housing the motor;
A tip tool that is rotationally driven by the motor and provided in front of the housing;
A forward / reverse switching lever that can be rotated so as to rotate the tip tool forward or backward,
An electric tool characterized in that the forward / reverse switching lever is rotatably provided in a housing. The electric tool according to claim 3, wherein the forward / reverse switching lever is exposed from a left-right direction of the housing.