JP5409227B2 - Trigger switch - Google Patents

Description

  The present invention relates to a trigger switch, and more particularly to a trigger switch used for an electric tool that requires environmental resistance such as dustproofing and waterproofing.

  As shown in FIGS. 13 to 15, the trigger switch in the prior art incorporates a switch mechanism inside a vertically long box shape, and sets a sliding operation element that transmits an operation operation from the external trigger 112 to an upper position. A cover 113 having an opening on the side surface of the case 113, a cover 114 having an open portion opened to expose the control element (FET) on the outside, and a finger of the hand A trigger 112 that can be operated at the top, a switching operation unit 115 that is positioned on the top surface of the case 113 and switches the rotation of the motor, and a cover 114 attached to the case 113 and a heat radiating plate 116 disposed at the outer periphery thereof. It has become.

The case 113 includes a switch chamber 120 that incorporates a switch mechanism having an opening on one surface, and a control element mounting portion 117 on which the control element 119 is mounted, and is on the boundary line between the control element mounting portion 117 and the switch chamber 120. Has a structure provided with two first and second dustproof walls 118A and 118B formed by linear protrusions.
Further, a semi-cylindrical coaxial engagement hole for engaging the sliding shaft 122 of the sliding operation element 121 is provided on the side surface communicating with the switch chamber 120.
Then, a sliding circuit board is placed from above the switch chamber 120 and a control element (FET) 119 is placed on the control element placing portion 117 for assembly.

  The sliding operation element 121 includes a sliding shaft 122 on which a trigger 112 can be attached to a free end formed in a rod shape, and two sliding elements arranged in parallel on the top side of the sliding shaft 122 on the base side. Then, a speed control unit 123 for controlling the rotational speed of the motor is provided, and a control element short-circuit unit 124 provided with a sliding knob that slides on the movable contact piece that short-circuits the control element on the side wall surface with respect to the speed control unit 123. , A power supply control unit 125 having a sliding knob that slides on a movable contact that supplies power to the FET that controls the motor at a position aligned with the control element short-circuit unit 124, and a direction opposite to the body side of the power supply control unit 125 Thus, a motor short-circuit portion (not shown) is provided on the base side of the sliding shaft to apply a brake by short-circuiting the motor.

  In the switch having such a structure, as shown in FIG. 14, the speed control unit 123 connected to the sliding operation element 121 is moved in the switch chamber 120 by the pull-in operation of the trigger, whereby the sliding shaft 122 is switched. As the air enters the chamber 120 and the indoor area of the switch chamber 120 is reduced by that amount, the reduced air flows out to the outside.

  Further, as shown in FIG. 15, when the trigger 112 is returned to the original position, the sliding shaft 122 connected to the sliding operation element 121 is pulled out, so that the space in the switch chamber 120 is expanded and the outer space is expanded. From the air flows into the switch chamber 120.

JP2009-0545540

  However, in the trigger switch described in the prior art, when the sliding operation element 121 that moves in conjunction with the trigger 112 is pulled into the switch chamber 120 in the switch body by operating the trigger 112, By reducing the space volume, the air in the switch chamber 120 flows out (see FIG. 14). Thereafter, when the trigger 112 is operated and the sliding operation element 121 is returned to the original state, the switch mechanism that has entered the switch chamber 120 moves outward, so that the air volume in the switch chamber 120 increases. Then, air flows into the switch chamber 120 (see FIG. 15).

  The problem is when this air flows in. Generally, if fresh air flows in, there is no problem, but in environments where power tools are used, there is usually dust, dust, etc. mixed with air such as dust. ing. For this reason, dust, dust and the like mixed in the air also flow into the switch chamber together, and easily adhere to portions where the lubricating oil is poured or contact portions in the switch chamber. If the dust or air mixed with dust flows into the switch chamber continuously, there is a problem that the switch itself malfunctions.

  In addition, it is conceivable to completely seal so that air from the outside does not flow in. However, since the trigger is directly operated by hand, it is impossible to completely seal the sliding operation element that moves in conjunction with the trigger. In addition, when it is completely sealed, it will be sealed including the trigger, resulting in a functional incompleteness.

  Therefore, the conventional mechanism for linearly moving the switch mechanism in and out of the switch chamber described in the prior art is fundamentally reviewed, and at least there is no air flow in or out of the switch chamber, or more than current air flow in and out. If the number is reduced, there is a problem to be solved by a switch mechanism having a structure capable of preventing intrusion of impurities such as dust and dust mixed with air.

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

(1) The trigger switch includes a switch mechanism portion in which a mechanism for turning on / off by sliding at least two of the first movable contact and the second movable contact by a rotating operation of the rotor is installed in the housing; A trigger that pulls in a straight direction by a manual operation, and a connecting cam is attached to a switch engaging portion for rotating the rotor in accordance with the pulling operation of the trigger. The connecting rod interposed in the cam is caused to accompany the pull-in operation of the trigger .
(2) The trigger switch includes a switch mechanism portion in which a mechanism for turning on / off by sliding at least two first movable contacts and second movable contacts by a rotating operation of the rotor is installed inside the housing; A trigger that pulls in a straight direction by a manual operation, and a rack member that includes a gear is engaged with a switch engaging portion for rotating the rotor in accordance with the pulling operation of the trigger. The pinion member connected to the trigger is engaged with the gear of the engaged rack member to be accompanied by the pull-in operation of the trigger.
(3) The trigger switch includes a switch mechanism portion in which a mechanism for turning on / off by sliding at least two first movable contacts and second movable contacts by a rotating operation of the rotor is installed inside the housing; A trigger that pulls in a straight direction by a manual operation, and a connecting cam that includes a guide convex portion on a switch engaging portion that rotates the rotor in accordance with the pulling operation of the trigger. The connecting piece having the opening hole for attaching and engaging with the guide convex portion of the attached connecting cam is caused to accompany the pull-in operation of the trigger.
(4) The switch mechanism includes a switch engagement portion extended from a central position of the disk-shaped main body, a sliding contact piece provided on a peripheral edge of the disk-shaped main body, and a disk shape A rotor having a guide cam provided at each of the opposed peripheral ends of the main body and a first movable contact piece having a first movable contact are attached to one guide cam of the rotor. A first movable contact piece guide portion provided with a cam guide that engages and guides in a straight direction and a second movable contact piece having a second movable contact are mounted and engaged with the other guide cam of the rotor. The first movable contact piece guide portion is housed in a switch case and sealed with a switch cover covered with a second movable contact guide portion provided with a cam guide that guides in a direction in which the first movable contact piece guides straightly and in the opposite direction. (1) to (3 Trigger switch according to.
(5) The rotor, the first movable contact guide portion, and the second movable contact guide portion, which have the structure of the switch mechanism portion, are accommodated in the switch case and sealed with a switch cover. The trigger switch according to (4), wherein the inside is filled with a liquid or gel-like insulating member so as to eliminate air.
(6) The trigger switch according to (5), wherein the liquid or gel-like insulating member is grease or oil.

  In the trigger switch according to the present invention, the inflow of air can be extremely reduced by rotating the switch mechanism provided in the switch chamber instead of the linear motion, so that the inflow of air from the outside is minimized. Can be suppressed. Accordingly, dust such as dust mixed with air can be prevented from entering the switch chamber, and malfunction of the switch caused by use can be eliminated.

Furthermore, the rotor, the first movable contact guide portion, and the second movable contact guide portion are accommodated in the switch case and covered with a switch cover, and sealed in a liquid or gel-like insulation so as to eliminate air. When the movable contact comes into contact with the fixed contact, the filled grease is scraped and brought into contact with the conductive member, preferably filled with grease. For this reason, since the contact position is constantly filled with grease, sparks generated when the contact contacts or separates from the contact can be eliminated by the grease, and the influence on the surroundings can be eliminated.
Furthermore, by filling with grease, there is no flow of air to the contacts and rotor that move inside, so there is no contamination of foreign matters such as dust and dust mixed in the air.

It is the perspective view which showed the general view of the trigger switch which concerns on this invention. It is the perspective view which decomposed | disassembled and showed the inside. It is the perspective view which decomposed | disassembled and showed the inside. It is the exploded perspective view which exploded and showed the switch mechanism part same as the above. It is explanatory drawing which showed the mode of the movable contact piece which moves based on the rotation operation of a rotor similarly. It is explanatory drawing which showed the mode of the sliding resistance which moves based on the rotation operation | movement of a rotor. It is explanatory drawing which showed the mode of the sliding resistance and change switch which move based on the rotation operation of a rotor. It is the perspective view which showed the general view of the trigger switch which generate | occur | produces the rotation operation by the pinion and rack of this invention. It is explanatory drawing which showed a mode that dust was discharged | emitted by the groove | channel provided in the pinion by the relationship between a pinion and a rack, and dust was discharged | emitted from the groove | channel on the rack side. It is explanatory drawing which showed the mode of the groove | channel provided in the pinion and the rack by the relationship between the pinion and the rack. It is explanatory drawing which showed the relationship between the pinion and rack which do not provide a groove | channel by the relationship between a pinion and a rack. It is the perspective view which showed the general view of the trigger switch which generates rotation operation | movement using the open hole provided integrally with the trigger of this invention. It is the top view which showed the external appearance of the trigger switch in a prior art. FIG. 6 is a partially exploded plan view showing the air flow when the trigger is pulled in. FIG. 6 is a partially exploded plan view showing the air flow when the trigger is returned to the original position.

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

  In the trigger switch according to the present invention, the switch mechanism housed in the switch chamber in the switch body can be operated in a rotary manner by operating the trigger (operation part), so that the piston of the switch chamber can be Unlike the switch mechanism that moves in and out like this, since the switch mechanism is housed in a rotary manner in the switch chamber, there is provided a switch mechanism that can eliminate the flow of air from the switch chamber or keep the flow of air in and out very little. .

As shown in FIGS. 1 and 2, the rotary-type trigger switch includes a case 11 formed of a rectangular parallelepiped shape and a cover 12 attached so as to close the opening of the side surface of the case 11. A rotor 56 (with a first movable contact 93 and a second movable contact 97 installed in the switch mechanism section 41 shown in FIG. 4) provided therein with at least two first movable contacts and second movable contacts. 4) and a trigger mechanism 15 that pulls in the straight direction by hand operation. The trigger 15 In connection with the retracting operation, the switch engaging portion 42 for rotating the rotor 56 is attached to the connecting member connected to the trigger 15 so that the switch engaging portion 42 is rotated. It is.
The connecting member is that the connecting cam 13 is attached to the switch engaging portion 42 protruding out of the case, and the connecting rod 14 interposed in the attached connecting cam 13 is accompanied by the pull-in operation of the trigger 15. .

  This connecting member has a structure in which the switch engaging portion 42 from the switch mechanism portion 41 that turns the contact on / off is rotated outside, so that the same applies to the pull-in operation of the trigger 15 in the straight direction. Since it does not move in the straight direction, it is possible to eliminate a region where foreign matter such as dust stays.

  The trigger switch including such a connecting member is provided on the outside of the case 11 formed in a rectangular parallelepiped shape, the cover 12 attached so as to close the opening of the side surface of the case 11, and the case 11. A connecting cam 13 that engages with a switch engaging portion of a switch mechanism portion housed in an internal switch chamber and is driven to rotate, and a connecting rod that is coupled to the connecting cam 13 and slides linearly as the trigger is retracted. 14 and a trigger 15 that can be operated by hand.

  As shown in FIGS. 2 and 3, the case 11 is formed in a substantially rectangular parallelepiped shape with an opening on one side surface, and guides the connecting rod guide piece of the trigger 15 to the outside and guides the trigger 15 itself in a retracting direction. One side surface continuous to the side surface provided with the connecting rod guide portion 16, the rotary switch chamber 17 having a space for accommodating the switch mechanism portion 41 from the open surface. The insertion port for inserting the power supply terminal (first power supply terminal insertion port 18, second power supply terminal insertion port 19) and the insertion port for inserting the movable contact terminal (first movable contact terminal insertion port 21, second movable The contact terminal insertion port 22) is provided.

  As shown in FIGS. 2 and 3, the cover 12 covers the upper portion of the rotary switch chamber 17 of the case 11 and closes the cover 12. The cover 12 protrudes from one end to guide the trigger guide piece 32 of the trigger 15. A first signal connection piece arrangement portion that includes a guide portion 35 and that attaches and fixes the first signal connection piece 26 and the second signal connection piece 27 formed of a conductive metal member at a predetermined distance on the inner wall. 36 and the second signal connection piece arrangement portion 37 are provided.

  The switch mechanism 41 is a main part of the present invention. Based on a so-called rotary operation from the outside, the movable contact piece is linearly moved to turn on / off and filled with grease to be sealed. Therefore, a switch engagement portion 42 for linearly driving the movable contact piece based on rotational drive is formed on the top surface formed in a rectangular parallelepiped shape, and the first movable contact piece 91 is slid on the side surface. The first fixed contact portion 43 connected to and connected to the contact mounting portion 75 and the second fixed contact portion 44 connected to and connected to the second fixed contact 59 are formed to project. The control board 45, the control element 46, and the heat sink 47 are each attached to the side surface.

The internal structure of this switch mechanism will be described with reference to FIG.
The switch mechanism portion 41 connects the first fixed contact portion 43 and the second fixed contact portion 44, the first fixed contact 58 and the second contact placement portion 76, which are formed of the above-described conductive metal member, and is externally connected. The switch case 51 is formed by insert-molding the connection bar 60 having the connection piece 78 connected to the power source piece, and the movable contact pieces 91 and 95 are mounted on the switch case 51 and the movable contact guide of the rotor 56 is provided. First movable contact piece guide portion 54 and second movable contact piece guide portion 55 that move linearly in a staggered direction by cams 66 and 67, and a switch member formed to protrude upward from an upper central position formed in a disk shape. The first sliding contact mounting part 64 and the second mounting part 42 for mounting the first sliding contact piece 62 and the second sliding contact piece 63 formed of a conductive metallic member at positions opposite to each other on the surface. Sliding contact piece mounting portion 65 A rotor 56 provided with movable contact guide cams 66 and 67 for guiding the first and second movable contact guides 54 and 55 in alternate straight directions on the bottom surface, and first and second sliding contact pieces 62 and 63. The first to fourth sliding contact portions 71, 72, 73, 74 that are insert-molded with the sliding control board 68 that slides on and the contact springs 69a, 69b, 69c, 69d interposed in the sliding control board 68. The switch cover 57 is provided.

  The switch case 51 connects the first fixed contact portion 43 and the second fixed contact portion 44, the first fixed contact 58 and the second contact placement portion 76, which are formed of a conductive metal member as described above, and In order to mount the connection bar 60 composed of the connection piece 78 connected to the power source piece by insert molding and to place the first movable contact piece guide portion 54 at the position where the first fixed contact portion 43 is insert-molded. A second contact portion 75 having a first contact placement portion 75 formed in a recess shape and a second recess portion for mounting the second movable contact piece guide portion 55 at a position where the second fixed contact portion 44 is insert-molded. A contact mounting portion 76 is provided.

  The first movable contact piece guide portion 54 is placed so as to move linearly on the first contact placement portion 75 at the position where the first fixed contact portion 43 of the switch case 51 is installed. Formed in a rectangular parallelepiped shape, a wall-shaped guide piece 81 is provided at one end of the H shape, and a guide is provided so as to move in a linear direction by a movable contact guide cam 66 provided in the rotor 56 inside the guide piece 81. The cam guide 82 is provided, and a first movable contact piece mounting portion 83 for attaching the first movable contact piece 91 formed in a U-shape is provided at a position formed by an H-shaped depression.

The first movable contact piece 91 is formed of a conductive metal member, is formed in a substantially U-shape, one end is a terminal having an engagement hole 92, and the other end is a first terminal. This is a terminal provided with a movable contact 93.
The first movable contact piece 91 has the first movable contact piece mounting portion 83 of the first movable contact piece guide portion 54 engaged with the engagement hole 92 of one terminal with the convex portion 83a, and the contact piece supporting spring 94a is moved. The contact holding spring 94b is bitten so as to abut on the back side of the first movable contact 93 so as to be bitten at an intermediate position of the first movable contact piece 91.

  The second movable contact piece guide portion 55 has the same structure as the first movable contact piece guide portion 54 described above, and is arranged in a manner opposite to each other. It is a position where the second fixed contact portion 44 of the switch case 51 is installed and is placed so as to move linearly on the second contact placement portion 76, and is formed in a substantially H-shaped rectangular parallelepiped, A wall-shaped guide piece 84 is provided at one end of the H type, and a cam guide 85 is provided inside the guide piece 84 and is guided so as to move in a linear direction by a movable contact guide cam 67 provided in the rotor 56. The second movable contact piece mounting portion 86 for attaching the second movable contact piece 95 formed in a U shape is provided at the position formed by the H-shaped depression.

The second movable contact piece 95 has substantially the same structure as the first movable contact piece 91 and has a reverse direction. The second movable contact piece 95 is formed of a conductive metallic member and has a substantially U-shape. One end is a terminal having an engagement hole 96, and the other end is a terminal having a second movable contact 97.
The second movable contact 97 engages the second movable contact piece mounting portion 86 of the second movable contact piece guide portion 55 with the engagement hole 96 of one terminal in a convex portion 86a (not shown), and contacts the piece. The support spring 94a is bitten at an intermediate position of the second movable contact piece 95, and the contact holding spring 94b is bitten so as to be in contact with the back side of the second movable contact 97.

  The rotor 56 is provided with a switch engaging portion 42 that is formed in a cylindrical shape in the upper part from the center position of the main body formed in a disk shape, and is formed by partially cutting out the circular shape on the free end side. The first sliding contact piece mounting part 64 for mounting the first sliding contact piece 62 and the second sliding contact piece 63 for mounting the first sliding contact piece 62 at the respective opposing positions on the upper surface of the disk-shaped main body. The bottom of the main body formed with a sliding contact piece mounting portion 65 and formed in a disk shape is provided with a second movable contact guide cam 67 having a circularly cut periphery of about a quarter, and a second movable section. The first movable contact guide cam 66 has a configuration in which the peripheral edge is cut out by about 1/8 in a positional relationship facing the guide cam 67.

  The switch cover 57 is formed in a rectangular parallelepiped shape with one surface opened so as to cover the switch case 51, and the first to fourth sliding contact portions 71, 72 formed of a conductive metallic member as described above. 73, 74 are formed by insert molding on the opposite surface with respect to the opening, and an engagement hole 77 is provided at the center for fitting the switch engagement portion 42 of the rotor 56 to project outside.

  A sliding control board 68 is attached to the inside of the opening through contact springs 69a, 69b, 69c, 69d, and the switch 56 of the rotor 56 is engaged with the opening 68a at the center of the sliding control board 68. The O-ring 70 for penetrating the portion 42 is provided.

  The sliding control board 68 performs speed control and full stroke control based on the pull-in state of the trigger, and the first sliding contact piece 62 and the second sliding contact piece 63 which are brushes provided in the rotor 56. And a sliding pattern that slides.

In the switch mechanism 41 having such a structure, first, the sliding control board 68 is mounted inside the switch cover 57 with the contact springs 69a, 69b, 69c, 69d, and the O-ring 70 interposed therebetween, and the first portion from above. Sliding control is performed on the switch engaging portion 42 of the rotor 56 in which the first sliding contact piece 62 is mounted on the first sliding contact piece mounting portion 64 and the second sliding contact piece 63 is mounted on the second sliding contact piece mounting portion 65. The rotor 56 is mounted so as to penetrate through the opening 68 a of the substrate 68 and the O-ring 70 and project outside from the engagement hole 77. The first movable contact guide portion 54 having the first movable contact piece 91 by engaging the cam guide 82 with the first movable contact piece guide cam 66 on the back side of the mounted rotor 56, and also the second movable contact piece. A cam guide 85 is engaged with the contact guide cam 67 and a second movable contact piece guide portion 55 having a second movable contact piece 95 is mounted together with a return spring 79.
The switch case 51 is covered so as to cover the mounted first movable contact guide portion 54 and second movable contact guide portion 55. Then, the joining surface of the switch cover 57 and the switch case 51 is welded by ultrasonic welding or the like so that the inside is sealed.

In this way, the inside of the switch case 51 can be sealed by covering the switch case 51. The inside of the sealed case, particularly the contacts (the first fixed contact 58 and the first movable contact 58) can be sealed. 93, the space in which the second fixed contact 59 and the second movable contact 97) are opposed to each other is filled with insulating grease so as to be sealed.
In particular, when the contact is filled with grease, not only can arcs generated when the contacts come into contact with it be suppressed, but there is no room for air to enter when the contact is made. It is also possible to prevent foreign matters such as dust and dust from entering.

The switch mechanism 41 having such a configuration is housed inside the case together with other members. 2 and 3 show the switch mechanism 41 and its related members. First, a control board 45 is attached to the side wall of the switch mechanism 41, and a control element 46 is attached to the control board 45. A heat radiating plate 47 that also serves as heat dissipation of the control element 46 is attached to the control element 46.
A leaf spring 48 is inserted into the first and second movable contact terminal insertion holes 21 and 22 for inserting the movable contact that is the inner space of the case 11.

The switch engaging portion 42 of the switch mechanism portion 41 is inserted into the switch through hole 23 of the case 11 so that the first fixed contact portion 43 and the second fixed contact portion 44 are in electrical contact with the leaf spring 48. The portion 41 is accommodated and attached to the rotary switch chamber 17.
Next, the first power supply conducting contact piece 24 is attached to the inner portion connected to the first power supply terminal insertion port 18 of the case 11.

  Further, the second power supply conducting contact piece 25 is attached to the inner portion of the case 11 connected to the second power supply terminal insertion port 19.

  Then, the first signal connection piece 26 and the second signal connection piece 27 are arranged in the first signal connection piece arrangement portion 36 and the second signal connection piece arrangement portion 37 of the cover 12, and the first fixed contact portion of the switch mechanism portion 41. 43 and the second fixed contact 44 are attached in a state of being in electrical contact with the cover 12.

Next, in order to attach the trigger 15, the return spring 28 is interposed, the trigger guide piece 32 is attached to the trigger guide portion 35 of the cover 12, and the connecting rod guide piece 31 is attached to the connecting rod guide portion 16 of the case 11. .
Then, the connecting cam 13 is engaged with the switch engaging portion 42 protruding from the switch through hole 23 of the case 11, the one protrusion of the connecting rod 14 is fitted to the connecting rod guide piece 31 of the trigger 15, and the other Is fitted into the engagement hole of the connecting cam 13.
As described above, the assembly of the trigger switch is completed.

  On / off of the movable contact piece in the switch assembled as described above will be described below with reference to FIG.

  First, in the initial state shown in FIG. 5A, that is, in the state where the trigger is not retracted, the first movable contact guide cam 66 of the rotor 56 engaged with the switch engaging portion 42 is first movable. The first cam guide 82 of the section guide portion 54 is maintained in contact. In this state, the first movable contact 93 of the first movable contact 91 mounted on the first movable contact guide portion 54 is kept away from the first fixed contact 58.

  Next, as shown in FIG. 5B, the rotor 56 is rotated by about 30 °, and the first movable contact piece guide cam 66 is rotated while being in contact with the first cam guide 82. Thus, when the first cam guide 82 is pushed and moved linearly, the first movable contact piece 91 mounted on the first movable section guide portion 54 moves in the linear direction, and the first movable contact 93 becomes the first movable contact 93. The fixed contact 58 is contacted.

  Further, FIG. 5C shows a state in which the rotor 56 has been rotated by about 63 °, and the first cam guide 82 is detached from the first movable contact guide cam 66, and at the same time, the rotor 56 is moved to the outer peripheral end of the rotor 56. The inclined surface of the one cam guide 82 comes into contact, and the current position is maintained. At the same time, the second movable contact guide guide 67 on the opposite side comes into contact with the second cam guide 85 of the second movable contact guide 55.

  FIG. 5D shows a state in which the rotor 56 has been rotated by about 80 °, and the second movable contact piece guide cam 67 is rotated while being in contact with the second cam guide 85. By moving the second cam guide 85 linearly, the second movable contact piece 95 mounted on the second movable contact piece guide portion 55 moves in the linear direction, and the second movable contact 97 becomes the second. The fixed contact 59 is contacted. Also at this time, since the inclined surface of the first cam guide 82 rotates while maintaining the state in which it contacts the outer peripheral end of the rotor 56, the contact state between the first movable contact 93 and the first fixed contact 58 is maintained well. Has been.

  Finally, it is a so-called full stroke state in which the rotor 56 is rotated about 120 ° as shown in FIG. Since the inclined surface of the first cam guide 82 rotates while maintaining a state in contact with the outer peripheral end of the rotor 56, the contact state between the first movable contact 93 and the first fixed contact 58 is maintained well, and similarly Since the inclined surface of the second cam guide 85 rotates while maintaining the state in contact with the outer peripheral end of the rotor 56, the contact state between the second movable contact 97 and the second fixed contact 59 is maintained well. .

  Next, accompanying the turning on / off of the movable contact described with reference to FIG. 5, the rotation control of the motor is controlled by changing the variable resistance value in the speed control unit in accordance with the rotation of the rotor. The technique to do is demonstrated with reference to FIG.

  FIG. 6 shows the control of a switch with an AC power supply (AC) speed controller, and shows how the variable resistance value for rotation control changes based on the sliding contact piece having only the variable resistor. The variable resistance value is changed in synchronization with the on / off of the movable contact piece shown in FIG.

  First, in the initial state shown in FIG. 6A, that is, in the position shown in FIG. 5A and the trigger is not retracted, the first of the rotor 56 engaged with the switch engaging portion 42 is obtained. The one sliding contact piece 62 is maintained at a position where the resistance becomes substantially zero so as to electrically connect the sliding contact on the sliding control board and the variable resistor.

  Next, when the rotor 56 shown in FIG. 6B rotates about 30 ° at the position shown in FIG. 5B, the first sliding contact piece 62 is controlled to slide as the rotor 56 rotates. The substrate 68 rotates and slides in a state of straddling the sliding contact 98 of the substrate 68 and the variable resistor 99. The position of the first sliding contact piece 62 at this time is in contact with the site of the starting end of the variable resistor 99 on the sliding contact 98 of the sliding control board 68.

  Furthermore, when the rotor 56 shown in FIG. 6 (C) rotates about 80 ° at the position shown in FIG. 5 (D), it is the short ON position, and the position of the first sliding contact piece 62 at this time is The rear end portion of the variable resistor 99 is in contact with the sliding contactor 98 of the sliding control board 68.

  Finally, at the position shown in FIG. 5 (E), when the rotor 56 shown in FIG. 6 (D) is rotated by about 120 °, that is, at a so-called full stroke, the position of the first sliding contact piece 62 at this time is The position of the same resistance value as that of the variable resistor 99 is in contact with the sliding contactor 98 of the sliding control board 68.

  Next, accompanying the turning on / off of the movable contact described with reference to FIG. 5, the rotation control of the motor is controlled by changing the variable resistance value in the speed control unit in accordance with the rotation of the rotor. In addition to having demonstrated the method to perform with reference to FIG. 6, the method to switch a switch using a 2nd sliding contact piece is demonstrated with reference to FIG.

  FIG. 7 shows control of a switch provided with a wear prevention circuit for a movable contact piece for on / off when controlling a switch with a DC power supply (DC) speed controller. FIG. 6 shows a state in which a variable resistance value for rotation control is changed based on a provided sliding contact piece and a state in which a switch is switched, and the variable resistance value is synchronized with on / off of the movable contact piece shown in FIG. And change over the changeover switch.

  First, in the initial state shown in FIG. 6 (A), that is, in the position shown in FIG. 7 (A) and the trigger is not retracted, the first state of the rotor 56 engaged with the switch engaging portion 42 is obtained. The one sliding contact piece 62 is maintained at a position where the resistance becomes substantially zero so as to electrically connect the sliding contact on the sliding control board and the variable resistor. At this time, the second sliding contact piece 63 is connected in a state straddling the sliding contact 88 and the first sliding contact 89a, thereby turning on the first switch.

  Next, when the rotor 56 shown in FIG. 7B rotates about 30 ° at the position shown in FIG. 6B, the first sliding contact piece 62 controls sliding as the rotor 56 rotates. The substrate 68 rotates and slides in a state of straddling the sliding contact 98 of the substrate 68 and the variable resistor 99. The position of the first sliding contact piece 62 at this time is in contact with the site of the starting end of the variable resistor 99 on the sliding contact 98 of the sliding control board 68. At this time, the second sliding contact piece 63 is connected in a state straddling the sliding contact 88 and the second sliding contact 89b, thereby turning on the second switch.

  Further, when the rotor 56 shown in FIG. 7 (C) rotates about 80 ° at the position shown in FIG. 6 (C), it is the short ON position, and the position of the first sliding contact piece 62 at this time is The rear end portion of the variable resistor 99 is in contact with the sliding contactor 98 of the sliding control board 68. At this time, the second sliding contact piece 63 is connected in a state straddling the sliding contact 88 and the third sliding contact 89c, thereby turning on the third switch.

  Finally, at the position shown in FIG. 6 (D), when the rotor 56 shown in FIG. 7 (D) is rotated by about 120 °, which is a so-called full stroke, the position of the first sliding contact piece 62 at this time is The position of the same resistance value as that of the variable resistor 99 is in contact with the sliding contactor 98 of the sliding control board 68. At this time, the second sliding contact piece 63 maintains the connection in a state of straddling the sliding contact 88 and the third sliding contact 89c, and keeps the third switch on.

Next, modified examples of the connecting member will be described with reference to FIGS.
Here, as described above, the trigger switch of the present invention has at least two first movable contacts and second movable contacts (first movable contacts installed in the switch mechanism section 41 shown in FIG. 4) inside the casing. 93, which corresponds to the second movable contact 97), and a switch mechanism portion 41 having a mechanism for turning on / off by sliding the rotor 56 (see FIG. 4), and a straight direction by hand operation. And a trigger 15 that pulls in, and a switch member that is connected to the trigger 15 is attached to a switch engagement portion 42 that rotates the rotor 56 in accordance with the pull-in operation of the trigger 15. That is, the joint portion 42 is rotated.
As shown in FIG. 8, the connecting member engages the rack member 5 having the gear 5 a with the switch engaging portion 42, and the pinion connected to the trigger 15 to the gear 5 a of the engaged rack member 5. That is, the member 6 is engaged to be accompanied by the pull-in operation of the trigger 15.
The pinion member 6 is formed by gears 6a arranged in a row, and has a structure in which a groove 6b is provided between the gear 6a and the gear 6a. Further, a groove is also formed between the gears 5a forming the rack member 5. It is set as the structure which forms 5b.

  If the groove 6b is not provided between the gear 6a forming the pinion member 6 and the groove 5b is not provided between the gear 5a forming the rack member 5, as shown in FIG. The dust accumulated between the gear 6a and the gear 6a is not discharged, and the gear 5a of the rack member 5 climbs over the dust, so that the accumulated dust is pressed and compacted as it is. Therefore, when dust is pushed out without being discharged, the gear 5a of the rack member 5 that engages with the gear 6a of the pinion member 6 and the gear 6a are unnaturally screwed, and the pinion member 6 moves in the straight direction. It becomes impossible to move or unnatural movement, resulting in the worst malfunction.

  In order to avoid such inconvenience, a structure in which a groove 6b is provided between the gear 6a and the gear 6a and a groove 5b is provided between the gear 5a and the gear 5a is shown in FIG. 9 and FIG. Thus, the dust accumulated between the gears 6a is discharged through the groove 6b, and the dust adhering between the gears 5a is also discharged through the groove 5b provided on the gear 5a side. For this reason, the dust adhering between the gears 6a is discharged without being compressed in the adhering place, so that the gear 5a of the rack member 5 engaged with the gear 6a of the pinion member 6 is always in good condition with the gear 6a. It can be screwed and it is possible to avoid fluctuations in movement such as malfunction.

Furthermore, a modified example of the connecting member will be described with reference to FIG.
Here, as described above, the trigger switch of the present invention has at least two first movable contacts and second movable contacts (first movable contacts installed in the switch mechanism section 41 shown in FIG. 4) inside the casing. 93, which corresponds to the second movable contact 97), and a switch mechanism portion 41 having a mechanism for turning on / off by sliding the rotor 56 (see FIG. 4), and a straight direction by hand operation. And a trigger 15 that pulls in, and a connecting member that is connected to the trigger 15 by a switch engaging portion 42 that rotates the rotor 56 (see FIG. 4) in accordance with the pull-in operation of the trigger 15. And the switch engaging portion 42 is rotated.
The connecting member is attached to the switch engaging portion 42 with the connecting cam 7 having the guide convex portion 7a, and the connecting piece 8 having the opening hole 8 for engaging with the guide convex portion 7a of the attached connecting cam 7. Is accompanied by the pull-in operation of the trigger 15.
The connecting piece 8 is formed integrally with the trigger 15, and the open hole 8 a provided in the connecting piece 8 is a long hole opened in a direction perpendicular to the pulling direction of the trigger 15. The guide projection 7a of the connecting cam 7 is engaged with such an open hole 8a.
In the connecting member having such a configuration, when the trigger 15 is pulled, the guide convex portion 7a engaged with the opening hole 8a of the connecting piece 8 is in contact with the inner end of the opening hole 8a. By moving in the direction, the switch engaging portion 42 engaged with the connecting cam 7 rotates in the clockwise direction. When the trigger 15 is returned, the guide convex portion 7a is guided upward in the drawing along the opening hole 8a, and the switch engaging portion 42 rotates counterclockwise.

  Provided is a trigger switch in which the amount of air flowing into and out of the switch is extremely reduced by providing a switch mechanism provided in the switch chamber with a contact piece that is turned on / off not by linear motion but by rotational motion.

5 Rack member 5a Gear 5b Groove 6 Pinion member 6a Gear 6b Groove 7 Connection cam 8 Connection piece 8a Open hole 11 Case 12 Cover 13 Connection cam 14 Connection rod 15 Trigger 16 Connection rod guide portion 17 Rotary switch chamber 18 First power terminal insertion Port 19 Second power supply terminal insertion port 21 First movable contact terminal insertion port 22 Second movable contact terminal insertion port 23 Switch through hole 24 First power supply connection piece 25 Second power supply connection piece 26 First signal connection piece 27 Second signal connection piece 28 Return spring 31 Connecting rod guide piece 32 Trigger guide piece 35 Trigger guide part 36 First signal connection piece arrangement part 37 Second signal connection piece arrangement part 41 Switch mechanism part 42 Switch engagement part 43 First Fixed contact portion 44 Second fixed contact portion 45 Control board 46 Control element 47 Heat sink 48 Leaf spring 51 Switch case 54 First movable contact piece 55 The second movable contact guide portion 56 The rotor 57 The switch cover 58 The first fixed contact 59 The second fixed contact 60 The connection bar 62 The first sliding contact 63 The second sliding contact 64 The first sliding contact mounting Part 65 Second sliding contact piece mounting part 66 First movable contact guide cam 67 Second movable contact guide cam 68 Sliding control board 68a Open hole 69a Contact spring 69b Contact spring 69c Contact spring 69d Contact spring 70 O-ring 71 First sliding contact portion 72 Second sliding contact portion 73 Third sliding contact portion 74 Fourth sliding contact portion 75 First contact placement portion 76 Second contact placement portion 77 Engagement hole 78 Connection piece 79 Return Spring 81 Guide piece 82 First cam guide 83 First movable contact mounting portion 83a Convex portion 84 Guide piece 85 Second cam guide 86 Second movable contact piece mounting portion 86a Convex portion 88 Sliding contact 89a First sliding contact Child 89b second slide Moving contact 89c Third sliding contact 91 First movable contact 92 Engagement hole 93 First movable contact 94a Contact support spring 94b Contact holding spring 95 Second movable contact 96 Engagement hole 97 Second movable contact 98 Sliding contact 99 Variable resistor

Claims (6)

A switch mechanism portion in which a mechanism for sliding on / off by sliding at least two of the first movable contact and the second movable contact by a rotating operation of the rotor is mounted inside the housing;
A trigger that pulls in a straight line by hand,
With
Along with the pull-in operation of the trigger, a connecting cam is attached to a switch engaging portion for rotating the rotor, and a connecting rod interposed in the attached connecting cam is caused to accompany the pull-in operation of the trigger. Trigger switch characterized by that . A switch mechanism portion in which a mechanism for sliding on / off by sliding at least two of the first movable contact and the second movable contact by a rotating operation of the rotor is mounted inside the housing;
  A trigger that pulls in a straight line by hand,
With
  As the trigger is retracted, a rack member having a gear is engaged with a switch engaging portion for rotating the rotor, and the gear of the engaged rack member is coupled to the trigger. A trigger switch characterized in that a pinion member that is engaged is engaged with the pull-in operation of the trigger. A switch mechanism portion in which a mechanism for sliding on / off by sliding at least two of the first movable contact and the second movable contact by a rotating operation of the rotor is mounted inside the housing;
  A trigger that pulls in a straight line by hand,
With
  A connecting cam provided with a guide convex portion is attached to a switch engaging portion for rotating the rotor in accordance with the pulling operation of the trigger, and an opening for engaging with the guide convex portion of the attached connecting cam. A trigger switch characterized in that a connecting piece having a hole is caused to accompany the pull-in operation of the trigger. The switch mechanism is
  The switch engaging portion extended from the center position of the disk-shaped main body, the sliding contact piece provided on the peripheral edge of the disk-shaped main body, and the peripheral edge of the disk-shaped main body. And a rotor provided with a guide cam provided at each of the opposing positions;
  A first movable contact guide portion which is provided with a cam guide which is mounted with a first movable contact piece having a first movable contact and which engages with one guide cam of the rotor and guides in a straight direction;
  A second movable contact piece having a second movable contact is mounted, and a cam guide is provided that engages with the other guide cam of the rotor and guides the first movable contact piece guide portion in the straight direction and the opposite direction. A second movable contact piece guide portion;
The trigger switch according to any one of claims 1 to 3, wherein the switch is housed in a switch case and covered with a switch cover to be sealed. Of the structure of the switch mechanism,
  The rotor, the first movable contact guide portion, and the second movable contact guide portion are housed in the switch case and covered with a switch cover so that the air is removed from the liquid or gel. The trigger switch according to claim 4, wherein the insulating member is filled. 6. The trigger switch according to claim 5, wherein the liquid or gel-like insulating member is grease or oil.

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