JP3768400B2 - Electric tool switch - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a power tool switch used for, for example, a portable power drill and other power tools, and more particularly to a power tool switch improved so that the rotational speed of a motor differs in forward and reverse rotation directions.
[0002]
[Prior art]
Conventionally, in an electric tool switch used for an electric tool used for business use or home use, a changeover switch unit is provided in the switch body in order to switch the forward / reverse direction of the rotation of the motor, thereby switching the forward / reverse direction. However, the configuration of this type of electric tool switch is schematically shown in FIGS. 12 to 14 and will be described below.
[0003]
As shown in FIG. 12, the electric tool switch 10 has a rotation speed control circuit for controlling the rotation speed of the motor, and includes a switch body 12 having a lock button 9. It comprises a changeover switch section 14 for switching rotation, a trigger 16 for pressing a manipulator 15 protruding from the switch main body 12 to change the rotation speed, and the like.
[0004]
As shown in FIGS. 13 (A) and 13 (B), the changeover switch portion 14 has an engagement hole 18 formed on the top surface of a rectangular case 17 formed of an insulator. A plate-like switching lever 13 having a fulcrum shaft 19 integrally projecting in the longitudinal direction of the case 17 at a remote position and rotating around the fulcrum shaft 19 is disposed.
[0005]
A cylindrical space 22 having an upper wall 21 on the upper side is formed inside the case 17, and a disk-shaped switching rotor 23 is accommodated in the space 22. A support shaft 24 that protrudes from the center of the upper wall 21 is inserted into a through hole 25 that is formed in the center of the upper wall 21.
[0006]
The switching rotor 23 has a boss 26 which is eccentric with respect to the support shaft 24 and protrudes from the upper surface. The boss 26 is rotated around the support shaft 24 by the circular rotation of the boss 26 and is shown in the figure. Switch the switch that does not.
[0007]
Further, a fitting hole 27 into which the fulcrum shaft 19 of the switching lever 13 is inserted is formed in the case 17 at one end side, and an arcuate through hole 20 for rotating the boss 26 is formed on the right side of the through hole 25. However, a circular peripheral wall 31 for inserting a disk-shaped cover 30 having an E-shaped cross section from the upper side of the upper wall 21 is formed.
[0008]
The cover 30 is provided with a rotation shaft 28 inserted into a through hole 25 formed in the upper wall 21 at the center, and a through hole 29 through which the boss 26 passes is formed eccentric from the center of the cover 30. Further, a countersink portion 32 is formed on the switching lever 13 facing the cover 30.
[0009]
Further, a switching lever 13 that rotates with the fulcrum shaft 19 as a fulcrum is disposed in the upper part of the cover 30, and a boss 26 that rotates in an arc shape passes through the engagement hole 18 of the switching lever 13. .
[0010]
In the above configuration, when the switching lever 13 is rotated in the counterclockwise direction when the switching lever 13 is viewed with respect to the fulcrum shaft 19 from above the switching switch portion 14, the engaging hole 18 at the tip of the switching lever 13 is moved into the engagement hole 18. The engaged boss 26 moves along the arcuate through-hole 20 to the counterclockwise end, and at this end position, for example, the switching rotor 23 switches to a later-described forward rotation control circuit set to a predetermined value. It is done.
[0011]
Conversely, when the switching lever 13 is rotated clockwise with respect to the fulcrum shaft 19 when viewed from above the switching switch portion 14, the boss 26 engaged with the engagement hole 18 at the tip of the switching lever 13 is The arcuate through-hole 20 moves to the right end in the clockwise direction, and at this right end position, for example, the switching rotor 23 is switched to the later-described reverse rotation control circuit side set to the same predetermined value as the forward rotation side.
[0012]
The forward / reverse rotation of the motor can be switched by the changeover switch unit 14 described above, but after the changeover, the motor corresponding to the stroke by the trigger 16 is provided in the switch body 12 disposed adjacent to the changeover switch unit 14. Will be controlled.
[0013]
For example, as shown in FIG. 14, such a circuit configuration centered on the switch body 12 is configured so that the power source 37 is switched by the series circuit of the power switch 33, the motor 34, and the selector switch unit 14, and the selector lever 13. The short-circuit switch 11 is connected in parallel between the input end and the output end of the normal rotation control circuit 35.
[0014]
After switching to forward rotation or reverse rotation by the switching lever 13, the stroke is changed by pressing the operating element 15 toward the switch main body 12 by the trigger 16, whereby the forward rotation control circuit 35 or the reverse rotation control circuit 36 is changed. The sliders 40 and 41 interlocked with the operation element 15 are slid on the built-in variable resistors 38 and 39, the voltage applied to the motor 34 is changed, and the rotation speed of the motor 34 is controlled.
[0015]
Specifically, in the case of forward rotation, the switch lever 13 is switched to the forward rotation side. First, the operation element 15 is pressed by the trigger 16 and the power switch 33 is turned on. When the slider 40 is slid on the variable resistor 38, the voltage to the motor 34 is changed, and when the operating element 15 is further pressed, the short-circuit switch 11 is turned on and the motor does not pass through the forward rotation control circuit 35. A predetermined voltage is applied to 34.
[0016]
On the other hand, in the case of reverse rotation, the control lever 15 is switched to the reverse rotation side, and the operation element 15 is moved with the same stroke as the forward rotation control circuit 35. Accordingly, the slider 41 of the reverse rotation control circuit 36 is slid. The same voltage as the forward rotation side is supplied to the motor 34.
[0017]
In these cases, if the voltage applied to the motor 34 is not an appropriate value, it does not move smoothly, such as picking up rectification noise, rotating irregularly, or rotating while vibrating. It is desirable that an appropriate voltage is applied to the rotation of the motor.
[0018]
[Problems to be solved by the invention]
However, since the electric tool switch 10 as described above has the same voltage for forward rotation and reverse rotation with respect to the same stroke of the operation element 15 by the trigger 16, it is set to a rotational speed with 100% efficiency in both forward and reverse rotations. Therefore, considering forward and reverse rotation, there is a problem that the efficiency of the motor 34 cannot be intensively improved by forward rotation.
[0019]
Furthermore, as shown in FIG. 14, a reverse rotation control circuit 36 must be provided in addition to the normal rotation control circuit 35, which complicates the circuit configuration, increases the shape, obstructs downsizing, and reduces the cost. There is a problem of rising.
[0020]
Therefore, the present invention aims to make the rotational speed of the motor in the reverse direction different from the forward direction by making the structure small and simple while making use of the structure of the conventional mechanical changeover switch section. To do.
[0021]
[Means for Solving the Problems]
The present invention provides, as a first configuration of an electric tool switch for solving the above-described problems, a changeover switch portion that switches the rotation direction of the motor in the forward and reverse directions by a changeover lever, and a rotation speed control that controls the rotation speed of the motor. A power tool switch having a switch body having a circuit and a trigger for controlling the setting of the rotation speed control circuit, wherein the movable stopper is interposed between the switch body and the trigger by a turning operation of the switching lever. The stroke restricting portion provided in the control unit and the operation restricting portion provided inside the trigger are attached and detached so as to change the rotational speed of normal rotation and reverse rotation.
[0022]
With the first configuration described above, the present invention secures a large stroke by the trigger so that the movement of the movable stopper is controlled by the switching lever in the case of rotation in the forward direction so that the stroke restricting portion and the operation restricting portion are not brought into contact with each other. The motor speed in the reverse direction is limited so that the stroke by the trigger is limited with the stroke restricting part and the operation restricting part being in contact with each other in the case of reverse rotation. can do.
[0025]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of an electric tool switch according to the present invention will be described below with reference to the drawings. 1 to 8 are configuration diagrams schematically showing one embodiment of the present invention. In order to facilitate understanding, the same parts as those of the conventional power tool switch will be described with the same reference numerals.
[0026]
As shown in FIG. 1, the electric tool switch 50 has a built-in rotation speed control circuit 51 for controlling the rotation speed of the motor 49 (49A, 49B, 49C) shown in FIG. The switch body 52, the changeover switch portion 54 that is mounted on the switch body 52 and switches between forward and reverse rotation by the switch lever 53, and the operating element 55 shown in FIG. , And a movable stopper 58 that is interposed between the switch main body 52 and the trigger 57 and restricts the stroke of the trigger 57 by forward and reverse rotation of the motor 49. A description will be made sequentially.
[0027]
As shown in detail in FIGS. 2 and 3, the changeover switch portion 54 is extended on the upper surface of a rectangular case 59 formed of an insulating material in a plate shape from the tip and rises in an inclined manner at a bent portion 60 in the middle. A switching lever 53 that extends horizontally and spreads in the shape of a palm at the end and gradually increases in thickness is disposed. Further, the switching lever 53 is further away from the bent portion 60 toward the end by a predetermined distance. A projecting portion 53A is projected from the bottom surface.
[0028]
Further, as shown in FIG. 3B, the switching lever 53 is formed with an engagement hole 18 at the tip, and protrudes integrally with the case 59 away from the engagement hole 18 to a position on the bent portion 60 side. A fulcrum shaft 19 that rotates with this as a fulcrum is provided. Further, a protruding portion 61 is provided on the bent portion 60 so as to protrude downward, and a countersink portion 32 is formed at a position facing the cover 30. .
[0029]
A cylindrical space 22 having an upper wall 21 on the upper side is formed inside the case 59, and a disk-shaped switching rotor 62 is accommodated in the space 22. A support shaft 24 that protrudes from the center of the upper wall 21 is inserted into a through hole 25 that is formed in the center of the upper wall 21.
[0030]
The switching rotor 62 has a boss 26 that is eccentric with respect to the support shaft 24 and protrudes from the upper surface. The boss 26 is rotated around the support shaft 24 by the circular rotation of the boss 26 to be described later. Switch the changeover switch.
[0031]
Further, a fitting hole 27 into which the fulcrum shaft 19 of the switching lever 53 is inserted is formed in the case 59 at one end side, and an arc-shaped through hole 20 for rotating the boss 26 is formed on the right side of the through hole 25. However, a circular peripheral wall 31 into which a disc-shaped cover 30 having an E-shaped cross section can be inserted from the upper side of the upper wall 21 is formed.
[0032]
In the cover 30, a rotation shaft 28 inserted into a through hole 25 formed in the upper wall 21 protrudes in the center, and a through hole 29 through which the boss 26 passes is formed eccentrically from the center of the cover 30.
[0033]
In the above configuration, when the switching lever 53 is rotated counterclockwise as viewed from the top of the changeover switch portion 54, the boss 26 engaged with the engagement hole 18 at the distal end portion of the changeover lever 53 is arcuate. Is moved to the left end in the counterclockwise direction along the through-hole 20, and a changeover switch described later is switched in the forward rotation direction at the left end position.
[0034]
Conversely, when the changeover lever 53 is rotated clockwise with respect to the changeover switch portion 54 as viewed from above, the boss 26 engaged with the engagement hole 18 at the tip of the changeover lever 53 has an arc shape. The through hole 20 moves to the right end in the clockwise direction, and a changeover switch described later switches to the reverse rotation direction at the right end position.
[0035]
The forward rotation and the reverse rotation of the motor 49 can be switched by the switching lever 53 disposed in the above-described switching switch portion 54. After switching, in the switch body 52 disposed adjacent to the switching switch portion 54, The rotation of the motor 49 is controlled corresponding to the stroke by the trigger 57.
[0036]
Next, the internal configuration of the switch main body 52 will be described in detail. The electrical configuration of the switch main body 52 is, as shown in FIG. 4, a sliding resistor 63 in which positive and negative voltages are applied to both ends. Of the rotation speed control circuit 51, the power switch 33, and the rotation speed control circuit 51, in which a slider 64 sliding on the sliding resistor 63 according to the stroke of the trigger 57, a voltage control circuit (not shown), and the like are built-in. The operation element 55 configured by the short-circuit switch 11 and the like connected in parallel to the input / output ends and pressed by the trigger 57 is interlocked with the power switch 33 and the slider 64.
[0037]
The power supply 37 is connected in series to each common end of a double-throw selector switch 66, which includes a power switch 33, field coils 49 </ b> A and 49 </ b> B of the motor 49, and a short-circuit switch 11 connected in parallel. ing.
[0038]
Further, the armature 49C of the motor 49 is connected to each switching end of the two pairs of changeover switches 66 connected to each other so that the connection to the armature 49C is reversed by the rotation of the switching lever 53. Connected to.
[0039]
In this configuration, when the switching lever 53 is rotated in the forward rotation direction, for example, counterclockwise as viewed from the upper side of the switching switch portion 54, the switching rotor 62 in the switching switch portion 54 is thereby linked to FIG. The changeover switch 66 shown is switched so as to rotate the connection of the armature 49C of the motor 49 in the forward direction.
[0040]
In the case of the forward rotation direction, the projection 61 projecting from the switching lever 53 does not depress the movable stopper 58 as will be described later. The stroke is not limited and can be freely moved to the full stroke.
[0041]
After the changeover switch 66 is switched to the forward rotation side by the changeover lever 53, first the operator 55 is pressed by the trigger 57 to turn on the power switch 33, and then the trigger 57 is further pressed to slide the resistor. The voltage applied to the motor 49 is changed by sliding the slider 64 interlocked with the trigger 57 on 63.
[0042]
When the trigger 57 moves immediately before the full stroke, the short-circuit switch 11 interlocked with the operation element 55 is turned on, and a predetermined voltage can be applied to the motor 49 without passing through the rotation speed control circuit 51.
[0043]
Further, the trigger 57 is locked when the lock button 9 is pressed to the switch body 52 side as necessary in a state where the trigger 57 is pressed to the switch body 52 side so that the trigger 57 does not need to be continuously pressed. It has become.
[0044]
In this case, the rotation speed control circuit 51 sets the voltage applied to the motor 49 by a built-in voltage control circuit (not shown) so that the rotation speed of the motor 49 is 100% efficient with respect to full stroke movement. .
[0045]
Conversely, when the switching lever 53 is rotated in the reverse direction, for example, clockwise when viewed from the upper side of the changeover switch portion 54, the changeover rotor 62 in the changeover switch portion 54 causes the motor 49 to rotate in the reverse direction. The connection of the armature 49C of the motor 49 is changed in the opposite direction to the forward direction by the changeover switch 66 shown in FIG.
[0046]
In the reverse direction, as the switching lever 53 rotates, the projection 61 projecting from the switching lever 53 presses the movable stopper 58 as will be described later. The stroke of the trigger 57 is limited by being inserted between the switch body 52 and the operation element 55 can be moved only by a half stroke, for example, by pressing the trigger 57.
[0047]
After the changeover switch portion 54 is switched to the reverse rotation side by the changeover lever 53, first, the operating element 55 is pressed by the trigger 57 to turn on the power switch 33. Thereafter, when the trigger 57 is further pressed, the sliding resistance The slider 64 interlocked with the trigger 57 is slid on the device 63 to change the voltage to the motor 49, and finally an appropriate voltage corresponding to, for example, a half stroke of the trigger 57 is applied to the motor 49. The
[0048]
Next, the external structure of the switch body 52 will be described in detail. As shown in FIGS. 5 and 6, a movable stopper 58 formed in a rectangular frame shape is disposed on the side wall 52A on the trigger 57 side. A cylindrical guide 68 projects from the center of the internal space 67 of the movable stopper 58, and the operating element 55 projects from the inside of the switch body 52 through the guide 68.
[0049]
The operation element 55 has a cylindrical shape at the guide 68 portion, but its distal end portion is formed as a rectangular block 55A, and has a circular hole 55B at the center thereof, and is wide in the vertical direction with respect to the switching lever 53. A slit 55C is formed through the hole 55B at a predetermined depth, and locking claws 55D and 55E are formed on the left and right side walls of the rectangular block 55A.
[0050]
Furthermore, in the internal space 67 of the movable stopper 58, holding portions 69 and 70 are provided at the upper and lower positions slightly away from the guide 68 with respect to the switching lever 53 and projecting from the side wall 52 </ b> A of the switch body 52. .
[0051]
The upper portion of the holding portion 69 is formed in a substantially semi-cylindrical shape with a flat surface 69A, a return spring 71 is inserted therein, a spring 72 is disposed between the flat surface 69A and the movable stopper 58, and The holding portion 70 is formed in a cylindrical shape, and a return spring 73 is inserted therein.
[0052]
Next, the movable stopper 58 will be described in detail. As shown in FIG. 7, the movable stopper 58 is formed in a rectangular frame shape having an internal space 67 in the center as a whole. Stroke restricting portions 58B and 58C projecting as a rectangular block are formed on the trigger 57 side shown in FIG. 5 at the upper and lower ends of the thick wall. .
[0053]
Further, the left side wall 58D of the movable stopper 58 is a thin frame wall whose inside extends to the outside at the center, as with the right side wall 58A, and a rectangular block on the trigger 57 side at the upper and lower ends of the thick wall. Stroke restricting portions 58E and 58F are formed.
[0054]
The left side wall 58D and the right side wall 58A are integrally connected to these at the bottom by a thin U-shaped connecting part 58G, and the stroke is regulated by a connecting member 58J having the upper wall 58H as the U-shaped upper side. The portions 58B and 58E and the end portions on both sides thereof are integrally formed.
[0055]
The connecting member 58J has a horizontal portion 58M extending in a bowl shape with a predetermined width and a predetermined length so as to coincide with the upper surface 58L of the upper wall 58H from one end of the connecting member 58J on the side surface 58K on the trigger 57 side. Further, a slide portion 58N that is inclined obliquely from the horizontal portion 58M toward the internal space 67 side is provided.
[0056]
A spring 72 indicated by a dotted line is inserted between the bottom of the upper wall 58H of the connecting member 58J and the flat surface 69A of the holding portion 69 fixed to the switch body 52, and the movable stopper 58 is attached to the switch body 52. Press upward.
[0057]
Next, the external appearance of the trigger 57 will be described first. As shown in FIGS. 5 and 6, the cover 74 of the trigger 57 is a roof formed by a circular arc in a bowl shape with a predetermined thickness that the operator presses with a palm. Side surfaces covered so that the surfaces are substantially parallel to each other except for the portion 74A, a protruding portion 74B that protrudes upward from the roof portion 74A, and a U-shaped upper end 74C 74D, and the side end 74E of the cover 74 on the switch body 52 side is U-shaped.
[0058]
Next, the inside of the trigger 57 will be described. As shown in FIG. 8, the inside of the trigger 57 is a position separated from the upper end 74 </ b> C of the cover 74 by a predetermined distance L <b> 2 toward the inside, and the side end of the cover 74. A semicircular upper plate 75 is integrally provided with the cover 74 at a position separated by a distance L1 from the inside of 74E.
[0059]
The upper plate 75 has a rectangular switching block 75B that is located at the center with respect to the left and right side surfaces 74D and extends from the projecting portion 74B side of the cover 74 to the upper end portion 75A of the upper plate 75. The tip portion 75C of the switching block 75B is formed in a triangular shape.
[0060]
The projecting portion 53A of the switching lever 53 abuts on the switching block 75B so that the switching lever 53 does not move in reverse during the operation.
[0061]
A rectangular rib member 76 extends downward from one central end of the upper plate 75, and the other end of the rib member 76 has a space 77A in the center, and a peripheral wall is formed in a D shape with a predetermined thickness. The spring guide 77 is formed integrally with the flat portion 77B.
[0062]
The upper end of the spring guide 77 is selected so as to be located on the inner side by a length L3 from the side end 74E of the cover 74. Both arc-shaped side surfaces of the spring guide 77 are plate-like on the side surfaces 74D on both sides of the cover 74. The operation restricting portions 77C and 77D are integrally formed.
[0063]
Further, a cylindrical guide member 77E is integrally projected from the roof portion 74A of the cover 74 at the center of the space portion 77A of the spring guide 77, and between the guide member 77E and the space portion 77A, a figure is shown. 5 and a return spring 71 shown in FIG. 6 are inserted.
[0064]
The lower end of the spring guide 77 is connected to the central portion of the upper plate 78A of the storage locking portion 78 whose periphery is II-shaped by a connecting member 79, and on the opposite side of the connecting member 79 to the upper plate 78A. A locking plate 78B is integrally extended over a predetermined length at a position separated by L4 from the upper plate 78A in the center of the storage locking portion 78 located.
[0065]
Further, one end of the side plates 78C and 78D is integrally formed on both sides of the upper plate 78A of the storage locking portion 78 with a slight distance from the side surface 74D, and a locking groove 78E, at the center of these side plates 78C and 78D. 78F (78F is not visible) is formed.
[0066]
The rectangular block 55A of the operating element 55 shown in FIGS. 5 and 6 is inserted and locked in the storage locking portion 78. At this time, the locking plate 78B is inserted into the slit 55C and is placed on the side wall. The provided locking claws 55D and 55E engage with the locking grooves 78E and 78F, respectively.
[0067]
The other ends of these side plates 78C and 78D are integrally formed with a lower plate 78G whose periphery excluding the upper portion projects integrally with the cover 74, and a spring having the same height as the spring guide 77 is formed at the center of the lower plate 78G. A connecting member 81 connected to the guide 80 is connected.
[0068]
A cylindrical spring guide 80 is connected to the connecting member 81, and a cylindrical guide member 80B is integrally projected from the roof portion 74A of the cover 74 at the center of the space portion 80A of the spring guide 80. A return spring 73 shown in FIGS. 5 and 6 is inserted between the guide member 80B and the space 80A.
[0069]
Further, on both sides of the spring guide 80, plate-like operation restricting portions 80C, 80D extending from the side surface position retracted inward from the height of the spring guide 80 to both side surfaces 74D of the cover 74 and the roof portion 74A of the cover 74. Is formed integrally with them.
[0070]
Next, the operation of the electric tool switch 50 configured as described above will be described with reference to FIGS. 9 to 11. First, the switching lever 53 is switched to the normal rotation side and the trigger 57 is not pressed. The power tool switch 50 indicating the state is in the state shown in FIG.
[0071]
In the case of forward rotation, as shown in FIG. 9A, the switching lever 53 is rotated counterclockwise with respect to the fulcrum shaft 19 of the switching lever 53 as viewed from the lower side of the switching block 75B, that is, from above. It is.
[0072]
As shown in FIG. 9B, the entire movable stopper 58 is inserted between the trigger 57 and the main body switch 52 to be exposed, and the projection 61 of the switching lever 53 slides on the slide 58N. As a result, the movable stopper 58 is moving upward.
[0073]
Next, in a state where the switching lever 53 is switched to the forward rotation side and the trigger 57 is pressed, the trigger 57 is pressed from the free position FL indicated by the dotted line and moved to the distance S1, as shown in FIG. It is ready for use.
[0074]
In this case, as shown in FIG. 10 (B), since the projection 61 of the switching lever 53 is slid by the slide 58N, the movable stopper 58 moves upward, and the four operation restricting portions 77C ( 77D) and 80C (80D), the four stroke restricting portions 58B (58E) and 58C (58F) of the movable stopper 58 are moved upward.
[0075]
As a result, the engagement between the operation restricting portions 77C (77D) and 80C (80D) and the stroke restricting portions 58B (58E) and 58C (58F) is disengaged, and as shown in FIG. A long stroke reaching the left side wall 58D and the right side wall 58A of the movable stopper 58 is possible.
[0076]
In this case, since the protruding portion 61 of the switching lever 53 is slid to the slide portion 58N, the movable stopper 58 is positioned above the holding portion 69 fixed to the switch body 52 as shown in FIG. The upper surface 58A of the movable stopper 58 and the upper wall 58H of the movable stopper 58 can be moved upward by the extension force of the spring 72.
[0077]
Further, in the state where the switching lever 53 is switched to the reverse side and the trigger 57 is pressed, the trigger 57 is located at a distance S1 shown in FIG. 10A from the free position FL shown by a dotted line, as shown in FIG. In this state, the vehicle can move only up to a distance S2 (S2 <S1).
[0078]
As shown in FIG. 11B, this is because the projection 61 is moved to the horizontal part 58M located on the slide part 58N by the switching lever 53, so that the movable stopper 58 is pressed by the projection 61 and moved downward. It is for moving to.
[0079]
As a result, the positions of the four operation restricting portions 77C (77D) and 80C (80D) of the trigger 57 and the four stroke restricting portions 58B (58E) and 58C (58F) of the movable stopper 58 are engaged with each other, This is because the stroke of the trigger 57 is restricted and can move only from the position FL by S2.
[0080]
In this case, since the protruding portion 61 of the switching lever 53 is raised above the slide portion 58N, the movable stopper 58 is provided on the holding portion 69 fixed to the switch body 52 as shown in FIG. The spring 72 interposed between the upper flat surface 69A and the upper wall 58H of the movable stopper 58 is contracted, and the movable stopper 58 is moved downward.
[0081]
Thus, by rotating the switching lever 53 to the left and right, the projection 61 of the switching lever 53 moves the slide portion 58N up and down, so that the movable stopper 58 is moved up and down and the operation restricting portion of the trigger 57 is moved accordingly. The attachment / detachment between 77C (77D) and 80C (80D) and the stroke restricting portions 58B (58E) and 58C (58F) of the movable stopper 58 is controlled, and the stroke of the trigger 57 differs between forward rotation and reverse rotation.
[0082]
【The invention's effect】
As described above, according to the first configuration of the electric tool switch according to the present invention, in the case of forward rotation, the movement of the movable stopper is controlled by the switching lever so that the stroke restricting portion and the operation restricting portion are matched. Ensuring a large stroke by the trigger as a non-contact state and making the motor rotation speed efficient, and in the case of reverse rotation, the stroke by the trigger is limited with the stroke restricting part and the operation restricting part being in contact Thus, the rotation of the motor in the reverse direction can be limited.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an embodiment of a power tool switch according to the present invention.
2 is a perspective view showing a configuration of a changeover switch portion of the electric tool switch shown in FIG. 1. FIG.
3 is a configuration diagram illustrating a configuration of a changeover switch unit illustrated in FIG. 2, in which FIG. 3A is a front view, and FIG. 3B is a partial cross-sectional view taken along line AA in FIG.
4 is a block diagram showing an internal configuration of a switch body and an electrical configuration in the vicinity thereof in the electric tool switch shown in FIG.
FIG. 5 is a perspective view showing a state seen from an oblique upper side when the trigger is separated in the electric tool switch shown in FIG. 1;
6 is a perspective view showing a state seen from an oblique lower side when a trigger is separated in the electric tool switch shown in FIG. 1; FIG.
7 is a perspective view showing a state in which the movable stopper is viewed obliquely from the upper side in the electric tool switch shown in FIG. 1. FIG.
8 is a perspective view showing an internal state of a trigger in the electric tool switch shown in FIG. 1. FIG.
9 is an explanatory diagram for explaining a free state in which the trigger is not operated in the electric tool switch shown in FIG. 1, FIG. 9 (A) is a top view, and FIG. 9 (B) is a side view.
10A and 10B are explanatory diagrams for explaining a state when the trigger is pressed in the normal rotation state of the electric tool switch shown in FIG. 1, FIG. 10A is a top view, FIG. 10B is a partial side view, and FIG. ) Is a partial cross-sectional view excluding the switching lever when viewed in the direction of the arrow from AA in FIG.
11A and 11B are explanatory views for explaining a state when the trigger is pressed in a reverse state of the electric tool switch shown in FIG. 1, FIG. 11A is a top view, FIG. 11B is a partial side view, and FIG. The figure is a partial cross-sectional view excluding the switching lever when viewed in the direction of the arrow from BB shown in FIG.
FIG. 12 is a side view schematically showing a configuration of a conventional electric tool switch.
13 is a configuration diagram showing the configuration of the electric tool switch shown in FIG. 12, (A) is a perspective view of the electric tool switch as viewed obliquely from above, and (B) is a partial longitudinal section of the electric tool switch. FIG.
14 is a block diagram showing an electrical configuration inside the electric tool switch shown in FIG. 12. FIG.
[Explanation of symbols]
9; Lock button, 10, 50; Electric tool switch, 11; Short-circuit switch,
12, 52; switch body, 13, 53; switching lever,
14, 54; change-over switch section, 15, 55; operator, 16, 57; trigger, 17, 59; case, 18; engagement hole, 19, 24;
20, 25, 29; through-hole, 21, 58H; upper wall, 22; space,
23, 62; switching rotor, 26; boss, 27; fitting hole, 28; rotating shaft,
30, 74; cover, 31; peripheral wall, 32; countersink part, 33; power switch,
34, 49; motor, 35; forward rotation control circuit, 36; reverse rotation control circuit,
37; power source, 38, 39; variable resistor, 40, 41, 64; slider,
49A, 49B; field coil, 49C; armature, 51; rotational speed control circuit,
52A; side wall, 53A; protruding portion, 55A; rectangular block, 55B; hole,
55C; slit, 55D, 55E; locking claw, 58; movable stopper,
58A; right side wall, 58B, 58C, 58E, 58F; stroke restricting part,
58D; left side wall, 58G; connecting portion, 58J, 79, 81; connecting member,
58K, 74D; side surface, 58L; top surface, 58M; horizontal portion,
58N; slide part, 67; internal space, 60; bent part, 61; projection part,
63; sliding resistor, 66; changeover switch, 68; guide,
69, 70; holding part, 69A; flat surface, 71, 73; return spring,
72; Spring, 74A; Roof portion, 74B; Overhang portion, 74C;
74E; side ends, 75, 78; upper plate, 75A; upper end,
75B; switching block, 75C; tip, 76; rib material,
77, 80; spring guide, 77A, 80A; space portion, 77B; flat portion, 77C, 77D, 80C, 80D; operation restricting portion, 77E, 80B; guide member,
78; Storage locking part, 78B; Locking plate, 78C, 78D; Side plate,
78E, 78F; Locking groove, 78G; Lower plate

Claims (1)

A switch body for controlling the rotation speed of the motor by the pulling-in state of the operation element connected to the trigger;
A changeover switch portion disposed at an upper portion of the switch body, and a changeover switch portion that changes a rotation direction of the motor by a rotation operation of a changeover lever;
Two spring guides formed in a cylindrical shape are provided on the opposite side of the roof formed in an arc shape to be gripped by hand, and the operation is performed between the two spring guides. A trigger provided with a storage operation part for connecting the child, and a tip provided with a flat operation restricting part protruding from the left and right positions of each of the two spring guides;
It is interposed between the trigger and the switch body, and has a slide part that moves up and down by contacting the projection of the switching lever on the upper surface formed in a frame shape, and is formed to project from the upper and lower sides of the left and right side surfaces, respectively. A movable stopper having a flat stroke restricting portion,
A power tool switch comprising:
When the protruding portion of the switching lever is in the position slid to the slide portion, the operation restricting portion is opposed to the position deviated from the stroke restricting portion, and the trigger is pulled in,
By rotating the switching lever, the projection of the switching lever comes into contact with and slides on the slide part and moves the movable stopper downward, so that the operation restricting part comes into contact with the stroke restricting part. An electric tool switch, wherein the trigger is retracted while facing the position.

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