JP2011183523A - Trigger switch - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a trigger switch capable of wholly eliminating a phenomenon such as deflection of a switching movable contact piece, and capable of always stably providing even contact pressure. <P>SOLUTION: This trigger switch includes a case 13 provided with a switching lever storage chamber for storing a switching lever 15 for switching normal rotation-reverse rotation of a motor by operation of a switching knob, a sliding switching substrate arranged in a sliding switching substrate storage part arranged in a position adjacent to the switching lever storage chamber for storing the switching lever by being inserted from the vertical direction into an opening surface of the case, a first switching contactor arranged on one surface of the sliding switching substrate and a second switching contactor formed in a belt shape longer than the first switching contactor at a predetermined interval with this first switching contactor. When the switching movable contact piece installed in a switching control part of the switching lever slides by contacting with the first switching contactor and the second switching contactor arranged on the sliding switching substrate, a normal rotation-reverse rotation signal of the motor is generated. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a trigger switch, and more particularly to a trigger switch that is a switch for an electric tool used for a tool or the like equipped with a brushless motor.

  As shown in FIG. 35, the switch for a power tool in the prior art incorporates a sliding contact mechanism (speed control unit) inside a box-like shape and transmits a sliding operation from an external trigger lever 111. A case 113 having a moving operation unit 112 and having a side opening, a cover 114 having a sliding switching board 165 mounted on the inner side surface and closing a side opening of the case 113, and a trigger that can be operated by a finger of a hand The lever 111 and a switching lever 115 that switches between forward rotation and reverse rotation of the motor are provided at the upper position of the case 113.

  The case 113 is formed in a box shape having an opening on the side surface, and includes a sliding operation portion 112 having two first and second sliding movable contact pieces 161 a and 161 b at a lower position and connected to the trigger lever 111. And a space for storing a switching lever 115 for switching between normal rotation and reverse rotation of the motor.

  The sliding operation unit 112 is formed in a rod shape, and a plunger 155 to which the trigger lever 111 can be attached at a free end, and two first sliding movable contacts on the base side of the plunger 155 and parallel to the side surface. The piece 161a and the second sliding movable contact piece 161b are arranged, and a speed control unit 157 for controlling the start-up and rotation speed of the motor is provided.

  As shown in FIG. 36, the sliding switching board 165 has two first and second switching contacts 168a and 168b that switch between normal rotation and reverse rotation of the motor, and the first and second switching contacts. Third and fourth sliding contacts 166c and 166d for variably controlling the motor are arranged in parallel at lower positions of 168a and 168b, and first and second sliding contacts 166a for starting the motor at the lower positions. 166b are arranged in parallel.

  The switching lever 115 includes a switching knob 171 that protrudes upward from an upper end portion of a switching operation portion 172 formed in a cube, and a rotation shaft 173 that serves as a central axis that allows the switching lever 115 to rotate at a substantially central position. In addition, a contact piece portion 177 for mounting a switching movable contact piece 176 formed of a conductive metal member that generates a switching signal is provided on the side surface of the rear end portion.

  In the switching lever 115 having such a structure, the switching movable contact is made by engaging the rotating shaft 173 of the switching lever 115 with the rotating shaft engaging hole 181 and storing the contact piece 177 in the space. The piece 176 is in a state of facing the switching contacts 168a and 168b. Then, as shown in FIG. 37, the switching movable contact piece 176 is kept facing the first and second switching contacts 168a and 168b, that is, the output signal is kept off.

  In this state, as shown in FIG. 38, when the switching lever 115 is moved to perform the switching operation, the switching movable contact piece 176 contacts the sliding switching board 165 from above, and the first switching contact 168a and the first switching contact 168a 2 The switching contact 168b is made conductive.

JP2009-0545540

  However, in the trigger switch described in the prior art, the switching lever 115 for controlling forward / reverse rotation of the motor generates a switching signal for only one output of forward / reverse switching of the switching lever for forward / reverse switching. For this reason, there is a problem that a switching signal for neutral and reverse rotation or forward rotation at the time of forward / reverse switching is not output, and a malfunction occurs such that the signal is erroneously recognized as a forward or reverse signal when neutral.

  Further, when the switching lever 115 is operated to switch between normal rotation and reverse rotation of the motor, as shown in FIG. 39, the switching movable contact piece 176 is placed on the first (second) switching contact 168a (168b) on the substrate. As shown in FIG. 40, when the switching lever 115 is shaken, the switching lever 115 and the switching movable contact piece 176 are integrated so to speak. This movement is transmitted to the switching movable contact piece 176, the contact pressure of the switching movable contact piece 176 becomes weak, and the contact becomes unstable. That is, there is also a problem that the contact pressure of the switching movable contact piece 176 changes due to a slight movement (for example, wobbling) of the switching lever 115, resulting in an unstable contact state.

  Further, if the switching movable contact piece 176 is pressed against the first (second) switching contact 168a (168b), the switching movable contact piece 176 bends each time the switching lever 115 is switched. There is also a problem that breakage of the switching movable contact piece 176 occurs.

  Therefore, the structure of pressing the conventional switching movable contact against the switching contact is fundamentally reviewed, and the generation of signals related to the normal rotation and reverse rotation of the motor is output by different methods, so that there is no misrecognition. There is a problem that must be solved to prevent breakage due to repeated stress and a structure that does not cause a change in contact pressure without increasing the number of points.

  In order to solve the above problems, the trigger switch of the present invention is configured as follows.

(1) The trigger switch is adjacent to the case provided with a switching lever accommodating chamber for accommodating a switching lever for switching between normal rotation and reverse rotation of the motor by operation of the switching knob, and the switching lever accommodating chamber in which the switching lever is accommodated. A sliding switching board disposed by being inserted into the sliding switching board storage portion provided at the position from the vertical direction with respect to the opening surface of the case, and a first switching contact provided on one surface of the sliding switching board And a switching movable contact attached to the switching control portion of the switching lever, the second switching contact having a predetermined distance from the first switching contact and having a strip shape longer than the first switching contact. The piece slides in contact with the first switching contact and the second switching contact disposed on the sliding switching board to generate a normal rotation signal and a reverse rotation signal of the motor. .
(2) The trigger switch according to (1), wherein the switching lever includes a dustproof packing.

In the trigger switch according to the present invention, the sliding switching board is arranged vertically with respect to the opening surface of the case, and the switching movable contact piece of the switching lever is always in contact with the switching contact provided on the sliding switching board. By sliding with, it is possible to eliminate the phenomenon of switching movable contact pieces due to metal fatigue, and the contact pressure can always be obtained stably, so there is no change in contact pressure due to external factors. And a good connection state can be obtained.
Further, by adopting a structure in which the switching lever is provided with a dustproof packing, it is possible to prevent intrusion of dust from the gap of the moving part generated by the operation of the switching lever provided outside the switch.

It is the perspective view which showed the external appearance of the trigger switch of 1st Example which concerns on this invention. It is the perspective view which showed the external appearance from the position where a bottom part can be seen. It is the perspective view which showed the external appearance from the opposite side of the external appearance shown in FIG. FIG. 4 is a perspective view showing an appearance from a position where a bottom can be seen with respect to the appearance shown in FIG. 3. It is a perspective view which shows each component decomposed | disassembled similarly. FIG. 6 is a perspective view showing components viewed from the opposite direction with respect to the exploded view of FIG. 5. It is a perspective view which shows the case before same assembling. FIG. 8 is a perspective view showing a state in which the sliding switching board is housed in the case shown in FIG. 7. FIG. 9 is a perspective view showing a state in which a sliding operation unit is attached to the case shown in FIG. 8. FIG. 10 is a perspective view showing a state in which a switching lever is attached to the case shown in FIG. 9. It is a perspective view which shows a mode that the cover was attached to the case shown in FIG. FIG. 12 is a perspective view showing a state in which a trigger lever is attached to the substantially assembled switch shown in FIG. 11. FIG. 6 is a plan view showing a configuration of a contact on the motor control side of the sliding switching board shown in FIG. 5. FIG. 7 is a plan view showing a configuration of a contact that controls forward / reverse rotation of the motor of the sliding switching board shown in FIG. 6. It is a perspective view which shows a mode that the components shown in FIG. 10 were assembled from the opposite side. It is explanatory drawing which showed the arrangement | positioning state of the contact for outputting only the normal rotation of a motor. It is explanatory drawing which showed the arrangement | positioning state of the contact for outputting only reverse rotation of a motor similarly. It is explanatory drawing which showed the arrangement | positioning state of the contact for outputting both forward rotation and reverse rotation of a motor similarly. It is explanatory drawing which shows a mode when a switching lever is neutral at the same time. It is explanatory drawing which shows a mode when a switching lever is forward rotation similarly. It is explanatory drawing which shows a mode when a switching lever is reverse rotation similarly. It is the perspective view which showed the external appearance of the trigger switch of 2nd Example which concerns on this invention. It is the perspective view which showed the external appearance from the position where a bottom part can be seen. FIG. 23 is a perspective view showing an appearance from the opposite side to the appearance of FIG. 22. FIG. 25 is a perspective view showing an appearance from a position where the bottom can be seen with respect to the appearance shown in FIG. 24. It is a perspective view which shows each component decomposed | disassembled similarly. FIG. 27 is a perspective view showing components viewed from the opposite direction with respect to the exploded view of FIG. 26. It is a perspective view which shows the case before same assembling. FIG. 29 is a perspective view showing a state in which the slide switching board is housed in the case shown in FIG. 28. FIG. 30 is a perspective view showing a state where a guide plate is further accommodated in the case shown in FIG. 29. It is a perspective view which shows a mode that the sliding operation part was attached to the case shown in FIG. FIG. 32 is a perspective view showing a state where a switching lever is attached to the case shown in FIG. 31. It is a perspective view which shows a mode that the cover was attached to the case shown in FIG. It is a perspective view which shows a mode that the trigger lever was attached to the assembled switch shown in FIG. It is the perspective view which decomposed | disassembled and showed the components which comprise the switch in a prior art. It is the top view which showed the arrangement | positioning state of the contact of a sliding switching board | substrate similarly. It is explanatory drawing which shows a mode when a switching lever is an OFF state similarly. It is explanatory drawing which shows a mode when a switching lever is an ON state similarly. It is explanatory drawing which shows the movable contact piece position at the time of the maximum deflection angle when a switching lever is an ON state. It is explanatory drawing which shows the contact pressure state of a movable contact piece when a lever is shaken when a switching lever is an ON state similarly.

  A first embodiment of a trigger switch according to the present invention will be described with reference to the drawings.

  The switch according to the first embodiment of the present invention includes two movable contact pieces in a speed control unit of a sliding operation unit that moves in conjunction with a trigger, and a motor variable contact provided on a sliding switching board. The sliding circuit board is slid vertically on the motor starting contact, and the sliding switching board is arranged perpendicular to the opening of the case, so that the operating direction of the switching lever and the movable contact for the forward / reverse switching signal can be obtained. Since the load application direction of the piece is arranged vertically, the movable contact piece for the forward / reverse switching signal is always in contact with the sliding switching substrate, and the sliding operation is enabled, so that a stable contact pressure is always obtained. The resulting switch mechanism is provided.

  As shown in FIGS. 1 to 4, the trigger switch having the two sliding movable contact pieces in the first embodiment incorporates a sliding contact mechanism inside a box shape, and an external trigger lever 11 is incorporated. A case 13 having a sliding operation portion 12 for transmitting a sliding operation from the side and having a side surface opened, a cover 14 configured to close the side surface opening surface of the case 13, and a finger can be operated. The trigger lever 11 and the upper position of the case 13 are provided with a switching lever 15 that switches between normal rotation and reverse rotation of the motor.

  The case 13 is formed in a box shape with an opening on the side and bottom, and is formed so as to protrude to one side at the center position as shown in FIGS. 5 and 6, and is a half chip for engaging the plunger 55. A plunger control support chamber 21 having a shape is provided, and a speed control section storage chamber 23 for storing the sliding operation section 12 having a plunger 55 and a speed control section 57 at a depth from the plunger engagement support section 21 is provided. And a sliding switching board storage section 24 for storing the sliding switching board 65 by inserting the sliding switching board 65 into the opening from the vertical direction at a position adjacent to the speed control section storage chamber 23. The switch lever storage chamber 25 for storing the switch control unit 74 of the switch lever 15 is provided at a position adjacent to the switch lever 15.

  The sliding operation part 12 is provided with a plunger 55 formed in a cylindrical shape, and a trigger engaging part 56 that engages with the trigger lever 11 at the tip of the plunger 55. The speed controller 57 is formed, and a return spring 58 is engaged behind the speed controller 57 so that the trigger lever 11 is always urged in the opposite direction.

  The speed control unit 57 includes a first sliding movable contact piece 61 a and a second sliding movable contact piece 61 b that slide on the sliding member of the sliding switching substrate 65 on one surface different from the surface that is connected to the plunger 55. Is attached to the contact piece mounting portions 59a and 59b.

  The sliding switching board 65 has two sets of a first sliding contact 66a, a second sliding contact 66b, and a third sliding contact 66c arranged in parallel on the surface side for use in starting the motor and controlling the rotational speed. And a fourth sliding contact 66d, the first switching contact 68a and the second switching contact 68b for switching according to the present invention are arranged in parallel on the back surface, and the second switching contact 68b is elongated and arranged in a curved shape. Has been.

  The switching lever 15 is a main part of the present invention. The switching lever 15 includes a switching operation unit 72 having a switching knob 71, a rotation shaft 73 directly connected to the switching operation unit 72 and formed in a cylindrical shape, and a rotation shaft 73. A switching control unit 74 that is directly connected to the bottom and formed in a rectangular parallelepiped shape, and a packing 82c for inserting the switching knob 71 and preventing dust from entering near the rotating shaft 73 are configured.

  The switching operation unit 72 includes a switching knob 71 that protrudes upward on the tip side, and a pivot shaft that protrudes in a cylindrical shape in a direction opposite to the protruding direction of the switching knob 71 at the end formed in a trapezoidal shape. 73, the trapezoidal portion formed in the R shape is in contact with the packing 82c.

  The switching control unit 74 is formed in a rectangular parallelepiped shape connected to the end of the rotating shaft 73, and a switching movable contact piece 76 formed of a conductive metal member that generates a switching signal on one side surface thereof. Is provided with a contact spring 77 and a support spring 79 at the rear end, and the support 79 is in contact with the contact portion 26 provided in the depth of the switching lever storage chamber 25 of the case 13. Yes.

  As shown in FIGS. 5 and 6, the packing 82 c is formed in a rectangular shape with a hollow inside, and the switching knob 71 is inserted into the hollow portion and is stored in the packing storage portion 82 of the switching lever storage chamber 25. It has become.

  The switching lever storage chamber 25 that constitutes the case 13 engages the rotation shaft 73 of the switching lever 15 with the rotation shaft engaging hole 81, and the switching operation portion 72 that is formed one step higher than the rotation shaft 73. 13 is arranged outside. The switching movable contact piece 76 of the switching control unit 74 constituting the switching lever 15 is connected to the first switching contact 68a and the second switching contact 68b of the sliding switching board 65 in a slidable state.

  The speed control unit storage chamber 23 that constitutes the case 13 is a room that mainly stores the speed control unit 57 of the sliding operation unit 12, and is attached to the contact mounting unit 59 a of the speed control unit 57. The one sliding movable contact piece 61a is maintained in contact with the first sliding contact 66a and the second sliding contact 66b of the sliding switching board 65 that is inserted and installed in the adjacent position in the vertical direction. The second sliding movable contact piece 61b mounted on the contact piece mounting portion 59b is disposed so as to be in contact with the third sliding contact piece 66c and the fourth sliding contact piece 66d.

  The cover 14 is provided with an engaging portion 83 for engaging with the case 13 around the cover 14, and is formed in the same shape as the half-missing plunger engaging support portion 21 provided in the case 13. The plunger engaging support portion 84 is provided, and the plunger engaging support portions 21 and 84 are securely engaged with each other on the side thereof.

  Now, the assembly of the switch having such a configuration will be described below with reference to FIGS.

  First, as shown in FIG. 7, in the case 13, the speed control unit storage chamber 23, the switching lever storage chamber 25, and the sliding switching substrate 65 are arranged from the vertical direction of the opening surface of the case 13. It has.

  Then, as shown in FIG. 8, the sliding switching substrate 65 is stored in the sliding switching substrate storage portion 24 so as to be inserted from the vertical direction into the opening surface of the case 13. Then, although not shown, the first switching contact 68a and the second switching contact 68b provided on the sliding switching board 65 face the switching lever storage chamber 25 side, and the first, The second sliding contacts 66 a and 6 b, the third and fourth sliding contacts 66 c and 66 d are in a state of facing the speed control unit storage chamber 23.

  Next, as shown in FIG. 9, the speed control unit 57 of the sliding operation unit 12 is stored in the speed control unit storage chamber 23 with a return spring 58 interposed, and the plunger 55 is stored in the plunger engagement support unit 21. The two packings 82a and 82b are engaged with each other and stored. Then, although not shown in the drawing, the first sliding movable contact piece 61a attached to the side wall of the speed control unit 57 becomes the first sliding contact 66a and the second sliding contact 66b of the sliding switching board 65. The second sliding movable contact piece 61b is maintained at a position where the second sliding movable contact piece 61b can slide on the third sliding contact 66c and the fourth sliding contact 66d.

  Next, as shown in FIG. 10, the switching lever 15 is stored in the switching lever storage chamber 25. At that time, the packing 82 c is attached through the switching knob 71. Then, although not shown in the drawing, the state in which the switching movable contact piece 76 of the switching control unit 74 is in contact with the first switching contactor 68a and the second switching contactor 68b of the sliding switching board 65 so as to be slidable. maintain.

  As shown in FIG. 11, the cover 14 is put on each member assembled in this way from the upper part. At that time, the plunger engagement support portions 21 and 84 are engaged with each other, and the engagement portions 83 and 83a are engaged with the claws.

  Finally, as shown in FIG. 12, the assembly of the switch is completed by attaching the trigger lever 11 to the trigger engaging portion 56 at the head of the plunger 55.

  Now, regarding the switch assembled in this way, the operation of the switching lever in the internal structure thereof will be described below.

  First, as shown in FIGS. 5 and 6, each member schematically shown in the switch according to the present invention will be described. A case 13 formed in a box shape with an opening on the side surface, and an opening on the side surface of the case 13. A cover 14 configured to close the surface, a sliding operation unit 12 for transmitting a sliding operation from an external trigger lever 11 to control the speed and activation of the motor, and a sliding operation unit 12 on the surface. Sliding contacts 66a, 66b, 66c, 66d that come into contact with the sliding movable contact pieces 61a, 61b, and sliding contacts with switching contacts 68a, 68b that come into contact with the switching movable contact piece 76 of the switching lever 15 on the back surface. A switching board 65 and a switching lever 15 for switching between normal rotation and reverse rotation of the motor are provided.

  The case 13 includes a speed control unit storage chamber 23 that stores the speed control unit 57 of the sliding operation unit 12, and the sliding switching substrate 65 is placed perpendicular to the opening at a position adjacent to the speed control unit storage chamber 23. The slide switching board storage unit 24 is inserted and stored from the direction, and the switching lever storage chamber 25 is provided in the position adjacent to the sliding switching board storage unit 24 to store the switching control unit 74 of the switching lever 15. It has become.

  The sliding operation unit 12 has a plunger 55 formed in a cylindrical shape, a speed control unit 57 that is connected to the plunger 55 and formed in a rectangular parallelepiped shape, and a return spring 58 is engaged behind the speed control unit 57. Thus, the trigger lever 11 is always urged in the direction opposite to the pushing direction.

  The speed control unit 57 includes a first sliding movable contact piece 61 a and a second sliding movable contact piece 61 b that slide on the sliding member of the sliding switching substrate 65 on one surface different from the surface that is connected to the plunger 55. It has a structure equipped with.

  As shown in FIG. 13, the sliding switching board 65 includes two first sliding contacts 66 a and 66 b that are arranged in parallel on the surface side and used for speed control. A moving contact 6c and a fourth sliding contact 6d are provided. As shown in FIG. 14, the first switching contact 68a and the second switching contact 68b for switching according to the present invention are parallel to the second surface as shown in FIG. The switching contact 68b is elongated and arranged in a curved shape.

  The switching lever 15 is a main part of the present invention. The switching lever 15 includes a switching operation unit 72 having a switching knob 71, a rotation shaft 73 directly connected to the switching operation unit 72 and formed in a cylindrical shape, and a rotation shaft 73. It is comprised from the switching control part 74 directly connected to the bottom part and formed in the rectangular parallelepiped shape.

  When the switch having such a configuration is assembled, as shown in FIGS. 10 and 15, the sliding switching board 65 is housed in the sliding switching board housing part 24 of the case 13 and is slid into the speed control part housing chamber 23. The speed control unit 57 of the operation unit 12 is stored with a spring 58 interposed, the switching control unit 74 of the switching lever 15 is stored in the switching lever storage chamber 25, and the rotating shaft 73 is engaged with the rotating shaft engaging hole 81. The packing 82c through which the switching knob 71 is inserted is stored in the packing storage portion 82, and the switching operation portion 72 is stored outside.

  When assembled in this way, as shown in FIGS. 14 and 15, in particular, the switching movable contact piece 76 attached to the switching control unit 74 of the switching lever 15 is connected to the second switching contact 68 b of the sliding switching board 65. The state in contact with is maintained. In this state, by operating the switching knob 71 in the direction of the arrow in FIG. 15, the switching movable contact piece 76 of the switching control unit 74 moves while sliding around the rotation shaft 73, and as shown in FIG. The switching contact 68a and the second switching contact 68b are brought into contact with each other so as to generate a switching signal indicating that a motor (not shown) is normal.

Depending on the arrangement of the contacts on the substrate, it is possible to generate a signal when the motor is normal rotation, generate a signal when the motor is reverse rotation, and generate a signal when the motor is normal rotation and reverse rotation.
The contact shown in FIG. 16 shows an arrangement state of the contact for generating a signal when the motor is rotating forward, and the first switching is performed with respect to the second switching contact 68b formed in a curved belt shape. The contact 68a is disposed at the lower position.
The contact shown in FIG. 17 shows the arrangement of contacts that generate a signal when the motor is rotating in reverse. The first switching contact 68a is in contrast to the second switching contact 68b formed in a curved belt shape. Is placed in the upper position.
The contact shown in FIG. 18 generates a signal when the motor is rotating both forward and reverse. The first switching contact 68a and the third switching contact are made with respect to the second switching contact 68b formed in a curved belt shape. A contact 68c is disposed at the upper and lower positions.

19 to 21 show a state in which the switching lever 15 is housed in the switching lever housing chamber 25. Of these, the one shown in FIG. 19 is when the switching lever 15 is neutral, that is, the motor is in the normal state. It shows the neutral state without rolling or reversing.
The rotation shaft 73 is engaged with the rotation shaft engagement hole 81, and the packing 82 c is maintained in contact with the R portion of the trapezoidal portion of the switching operation portion 72, and is stored in the switching lever storage chamber 25. The switching movable contact piece 76 of the switching control unit 74 is not connected to the first switching contact 68a of the sliding switching board 65, but is connected to the second switching contact 68b. 79 is engaged with the recessed portion of the contact portion 26.

Next, as shown in FIG. 20, when the switching knob 71 is operated so that the motor moves in the forward rotation direction, the R portion of the trapezoidal portion of the switching operation portion 72 slides while being in contact with the packing 82c. The switching movable contact piece 76 of the control unit 74 is connected to the first switching contact 68 a and the second switching contact 68 b of the sliding switching board 65, and the oscilloscope 79 passes through the recessed portion of the contact portion 26.
As described above, since the R portion of the trapezoidal portion of the switching operation portion 72 is configured to slide while being in contact with the packing 82c, there is a gap between the switching knob 71 and the packing 82c due to the movement of the switching knob 71 located outside. Does not occur. Therefore, the dust that enters through the switching operation unit 72 can be blocked by the packing 82c.

  Next, as shown in FIG. 21, when the switching knob 71 is operated so that the motor moves in the reverse rotation direction, the R portion of the trapezoidal portion of the switching operation portion 72 slides while abutting against the packing 82c, and switching control is performed. The switching movable contact piece 76 of the portion 74 is connected to the second switching contact 68b and the third switching contact 68c of the sliding switching board 65, and the oscilloscope 79 passes through the recessed portion of the contact portion 26. Engages in the lower recess.

  Next, a second embodiment of the trigger switch of the present invention will be described with reference to the drawings.

  The trigger switch of the second embodiment includes a seesaw-type contact mechanism, and a sliding switching board is arranged perpendicular to the opening surface of the case, so that the operating direction of the switching lever and the forward / reverse switching signal Since the load application direction of the movable contact is arranged vertically, the movable contact for the forward / reverse switching signal is always in contact with the sliding switching board, enabling sliding operation, so that the contact is always stable. A switch mechanism capable of obtaining pressure is provided.

  As shown in FIGS. 22 to 25, the trigger switch having the seesaw type contact mechanism in the second embodiment incorporates a sliding contact mechanism inside a box shape, A case 13 having a sliding operation portion 12 for transmitting a sliding operation and having an open side surface, a cover 14 configured to close the opening surface of the side surface of the case 13, and a trigger lever 11 that can be operated by hand The upper lever of the case 13 is provided with a switching lever 15 for switching between normal rotation and reverse rotation of the motor.

  The case 13 is formed in a box shape with an opening on the side surface and the bottom surface, and as shown in FIGS. 26 and 27, the case 13 is formed so as to protrude to one side at a central position, and is a half chip for engaging the plunger 55. A plunger engaging support portion 21 having a shape is provided, and a guide plate storage portion 22 for storing the guide plate 27 is provided in a portion having an open side in the inside. 55 and a speed control unit storage chamber 23 for storing the sliding operation unit 12 including the speed control unit 57, and the sliding switching board 65 is vertically positioned with respect to the opening at a position adjacent to the speed control unit storage chamber 23. The slide switching board storage unit 24 is inserted and stored from the direction, and the switching lever storage chamber 25 is provided in the position adjacent to the sliding switching board storage unit 24 to store the switching control unit 74 of the switching lever 15. You have me.

The guide plate 27 includes a rectangular outer plate 28 and an inner plate 29 provided with an arrangement portion 31 for arranging the fixed contact piece 35 and the movable contact piece support base 41 in a concave shape. Has been.
The placement portion 31 of the inner plate 29 is provided with a groove 32 through which the external terminal 36 provided at the end of the fixed contact piece 35 is inserted, and the recess on the opposite side is also provided at the end of the movable contact piece support base 41. A groove 33 for inserting the external terminal 42 is provided, and the grooves 32 and 33 are provided so as to pass from the inner plate 29 to the outer plate 28.

  The fixed contact piece 35 is formed of a metallic member and includes an external terminal 36 connected to the outside at an end portion thereof, a fixed contact mounting portion 38 for mounting a fixed contact point 37 by bending the opposite side thereof at a right angle, and at a right angle. The projecting piece 39 is attached to the guide at both ends of the bent portion and press-fitted so as not to fall off.

  The movable contact piece support base 41 is formed of a metal member, and includes an external terminal 42 connected to the outside at an end portion thereof. The opposite end portion is bent at a right angle, and the bent end portion is bent at a right angle in the opposite direction. A movable contact piece engaging portion 43 that is formed by projecting pieces 45 projecting at both ends of the bent portion and engages a seesaw type movable contact piece 46 like a seesaw is provided, and a flat portion bent at a right angle is movable contact. The structure includes a contact portion 44 that contacts the guide piece 48 at the end of the piece 46.

  The seesaw-type movable contact piece 46 is formed of a metal member, is formed in an elongated shape, is bent at a substantially intermediate position, and protrudes outward at both ends near the bent portion to move the movable contact piece support base 41. The movable contact mounting portion 51 is provided with an engagement support portion 47 that engages with the contact piece engagement portion 43, the end portion side is bent in a right angle direction to form a guide piece 48, and a movable contact 49 is provided at the opposite end portion. , And the surface of the flat plate is formed with an oscillating sliding surface 52 on which the oscilloscope 63 abuts and slides.

  The sliding operation part 12 is provided with a plunger 55 formed in a cylindrical shape, and a trigger engaging part 56 that engages with the trigger lever 11 at the tip of the plunger 55. The speed controller 57 is formed, and a return spring 58 is engaged behind the speed controller 57 so that the trigger lever 11 is always urged in the opposite direction.

  The speed control unit 57 includes a sliding movable contact piece 61 that slides on the sliding switching substrate 65 on one surface different from the surface that is connected to the plunger 55 and is mounted on the contact piece mounting portion 59. The surface of the fixed contact piece 35 attached to the guide plate 27 and the seesaw type movable contact piece 46 attached to the movable contact piece support base 41 is slidably brought into contact with the surface. .

  The sliding switching board 65 is provided with a first sliding contact 66a and a second sliding contact 66b arranged in parallel on the front surface side for use in speed control, and a first switching contact according to the present invention on the back surface. The switching contactor 68a and the second switching contactor 68b are parallel and the second switching contactor 68b is elongated and arranged in a curved shape.

  The switching lever 15 is a main part of the present invention. The switching lever 15 includes a switching operation unit 72 having a switching knob 71, a rotation shaft 73 directly connected to the switching operation unit 72 and formed in a cylindrical shape, and a rotation shaft 73. It is comprised from the switching control part 74 directly connected to the bottom part and formed in the rectangular parallelepiped shape.

  The switching lever storage chamber 25 provided in the case 13 engages the rotating shaft 73 of the switching lever 15 with the rotating shaft engaging hole 81, and the switching operation portion 72 formed one step higher than the rotating shaft 73 is provided in the case. 13 is located outside. The switching movable contact piece 76 of the switching control unit 74 constituting the switching lever 15 is connected to the first switching contact 68a and the second switching contact 68b of the sliding switching board 65 in a slidable state.

  The speed control unit storage chamber 23 is a room that mainly stores the speed control unit 57 of the sliding operation unit 12, and the sliding movable contact piece 61 mounted on the contact mounting unit 59 of the speed control unit 57. Are arranged so as to maintain a state in which they are in contact with the third switching contact 66c and the fourth switching contact 66d of the sliding switching board 65 that is inserted in the vertical direction at adjacent positions.

  The cover 14 is provided with an engaging portion 83 for engaging with the case 13 around the cover 14, and is formed in the same shape as the half-missing plunger engaging support portion 21 provided in the case 13. The plunger engaging support portion 84 is provided, and the plunger engaging support portions 21 and 84 are securely engaged with each other on the side thereof.

  Now, assembly of the switch having such a configuration will be described below with reference to FIGS.

  First, as shown in FIG. 28, in the case 13, the guide plate storage portion 22 in which the speed control storage chamber 23, the switching lever storage chamber 25, the guide plate 27, and the sliding switching substrate 65 are arranged from the vertical direction of the opening surface of the case. The sliding switching substrate storage unit 24 is provided.

  Then, as shown in FIG. 29, the sliding switching board 65 is stored in the sliding switching board storage portion 24 so as to be inserted from the vertical direction into the opening surface of the case 13. Then, although not shown, the first switching contact 68a and the second switching contact 68b provided on the sliding switching board 65 face the switching lever storage chamber 25 side.

Next, as shown in FIG. 30, the guide plate 27 has the external terminal 42 of the fixed contact piece 35 inserted in the groove 32 and the external terminal 42 of the movable contact piece support base 41 inserted in the groove 33. The seesaw-type movable contact piece 46 is engaged with the movable contact piece engaging portion 43 of the movable contact piece support base 41.
As a result, the seesaw-type movable contact piece 46 is disposed in the state where the side surface 52 of the seesaw-type movable contact piece faces the adjacent speed control unit storage chamber 46.

  Next, as shown in FIG. 31, the speed control unit 57 of the sliding operation unit 12 is stored in the speed control unit storage chamber 23 with a return spring 58 interposed, and the plunger 55 is stored in the plunger engagement support unit 21. The packings 82a and 82b are engaged with each other and stored. Then, although not shown in the drawing, the state in which the scissors 63 of the speed control unit 57 are in contact with the scissors sliding surface 52 of the seesaw-type movable contact piece 46 is maintained, and the sliding movable attached to the opposite side of the speed control unit 57. The contact piece 61 is maintained at a position where it can slide on the third sliding contact 66c and the fourth sliding contact 66d of the sliding switching board 65.

  Next, as shown in FIG. 32, the switching lever 15 is stored in the switching lever storage chamber 25. At that time, the packing 82 c is attached through the switching knob 71. Then, although not shown in the drawing, the state in which the switching movable contact piece 76 of the switching control unit 74 is in contact with the first switching contactor 68a and the second switching contactor 68b of the sliding switching board 65 so as to be slidable. maintain.

  As shown in FIG. 33, the cover 14 is put on each member assembled in this way from the assembled upper part. At that time, the plunger engagement support portions 21 and 84 are engaged with each other, and the engagement portions 83 and 83a are engaged with the claws.

  Finally, as shown in FIG. 34, the assembly of the switch is completed by attaching the trigger lever 11 to the trigger engaging portion 56 at the head of the plunger 55.

The sliding switching board is arranged perpendicularly to the opening surface of the case, and the switching movable contact piece of the switching lever is slid while always in contact with the switching contact provided on the sliding switching board. The metal fatigue phenomenon of the movable contact piece can be eliminated, and the contact pressure can be obtained stably at all times, so that the contact pressure change due to external factors is completely equal, and a good contact state is obtained. Provide a trigger switch that can
Furthermore, the present invention provides a trigger switch that can obtain arbitrary output characteristics such as forward rotation or reverse rotation only, and normal rotation and reverse rotation outputs.

DESCRIPTION OF SYMBOLS 11 Trigger lever 12 Sliding operation part 13 Case 14 Cover 15 Switching lever 21 Plunger engagement support part 22 Guide board accommodating part 23 Speed control part accommodating chamber 24 Sliding switching board | substrate accommodating part 25 Switching lever accommodating chamber 26 Contact part 27 Guide plate 28 Outer plate 29 Inner plate 31 Arrangement portion 32 Groove 33 Groove 35 Fixed contact piece 36 External terminal 37 Fixed contact 38 Fixed contact mounting portion 39 Projection piece 41 Movable contact piece support base 42 External terminal 43 Movable contact piece engagement portion 44 Contact portion 45 Projection piece 46 Seesaw-type movable contact piece 47 Engagement support portion 48 Guide piece 49 Movable contact 51 Movable contact mounting portion 52 Oshibo sliding surface 55 Plunger 56 Trigger engagement portion 57 Speed control portion 58 Return spring 59 Contact Piece mounting portion 59a Contact mounting portion 59b Contact mounting portion 61 Sliding movable contact piece 61a First sliding movable contact piece 61b Second sliding movable contact piece 62 63 Oshibo 65 Sliding switching board 66a First sliding contact 66b Second sliding contact 66c Third sliding contact 66d Fourth sliding contact 68a First switching contact 68b Second switching contact 68c Third Switching contact 71 Switching knob 72 Switching operation section 73 Rotating shaft 74 Switching control section 76 Switching movable contact piece 77 Contacting piece portion 78 Pusher spring 79 Pusher 81 Rotating shaft engaging hole 82 Packing storage portion 82a Packing 82b Packing 82c Packing 83 Engagement Joint part 83a Engagement part 84 Plunger engagement support part 111 Trigger lever 112 Sliding operation part 113 Case 114 Cover 115 Switching lever 155 Plunger 157 Speed control part 165 Sliding switching board 161a First sliding movable contact piece 161b First 2 sliding movable contact piece 166a 1st sliding contact piece 166b 2nd sliding contact 166c 3rd sliding contact 166d Fourth sliding contact 168a First switching contact 168b Second switching contact 171 Switching knob 173 Rotating shaft 176 Switching movable contact 177 Contact piece 181 Rotating shaft engaging hole

Claims (2)

A case provided with a switching lever housing chamber that houses a switching lever for switching the forward / reverse rotation of the motor by operating a switching knob;
A sliding switching board arranged by being inserted from a vertical direction with respect to the opening surface of the case into a sliding switching board storage portion provided at a position adjacent to the switching lever storage chamber in which the switching lever is stored;
A first switching contact provided on one surface of the sliding switching substrate, and a second switching contact formed in a strip shape with a predetermined distance from the first switching contact and longer than the first switching contact. Prepared,
The switching movable contact piece attached to the switching control unit of the switching lever slides in contact with the first switching contact and the second switching contact disposed on the sliding switching board, so that the motor A trigger switch characterized by generating forward and reverse signals.   The trigger switch according to claim 1, wherein the switching lever includes a dustproof packing.

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