JP4611177B2 - Trigger switch - Google Patents

Description

  The present invention relates to a trigger switch mounted on a power tool, and more particularly to a trigger switch having a contact mechanism of a spring reversing switch suitable for AC and DC large currents.

  A conventional trigger switch will be described with reference to the drawings. In the description, the left side is the front of the switch and the right side is the back of the switch in the description.

  As shown in FIG. 16, the trigger switch 50 includes an operation unit 51, two return springs 52, a cover 53, a plunger 54, a guide plate 55, two plates 56a and 56b, and a reversing spring. 57, a reversing member 58, a stopper member 59, a stopper spring 60, an actuator 61, two terminals 62, two fixed contacts 63, four movable contacts 64a and 64b, and two movable members. A contact piece 65, two contact pressure springs 66, two fixed contacts 67, two terminals 68, and a case 69 are provided.

  When the components are assembled as shown by the alternate long and short dash line shown in FIG. 16, switches as shown in FIGS. 17 to 21 are formed. Hereinafter, the configuration and function of each component and the relationship between each component and other components will be described with reference to FIGS.

  The operation unit 51 is a part that is operated by a user's hand of the trigger switch 50, and is switched on when pressed from above and switched off when released.

  The operation unit 51 includes an upper surface bent in the shape of a hand, left and right side surfaces and a front surface integrally formed with the upper surface, and an open rear surface and lower surface, and is formed in a hollow case shape as a whole. Two holes 51 a are provided in the left and right side surfaces of the rear portion of the operation portion 51, and engage with a protrusion 53 a provided at the rearmost portion of the cover 53, thereby connecting the operation portion 51 and the cover 53.

  In addition, two bearing holes 51b are provided on the left and right side surfaces of the operation portion 51, and a rotation shaft 54e of a plunger 54 described later is rotatably fitted therein. Further, a bowl-shaped through hole 51c is provided on both side surfaces of the operation unit 51 for convenience of use. Furthermore, two protrusions 51d (see FIG. 19) for holding the upper end of the return spring 52 are provided inside the upper plate of the operation unit 51.

  The two coiled return springs 52 are always urged in the extending direction, and the upper ends thereof are fixed by the projections 51d of the operation unit 51, and the lower ends of the two return springs 52 are provided at the bottom of the cover 53 described later. The projection 53b is fixed.

  As shown in FIGS. 17 to 21, the function of the cover 53 is divided between the front half and the rear half so as to be understood in more detail. As shown in FIG. 19, the latter half portion has a function of holding the lower end of the return spring 52 by the protrusion 53 b and coupling with the rear end portion of the operation portion 51.

  The front half of the cover 53 serves as a lid for the case 69 and covers the plunger 54 as shown in FIG. The inclined portion 53d provided at the foremost portion of the cover 53 forms a space in which the sharp tip portion 54d of the plunger 54 moves back and forth.

  As shown in FIGS. 17 and 18, the left and right side plates of the cover 53 are placed outside the left and right side plates of the case 69, and the two claws 69a of the case 69 are fitted into the two through holes 53e. The cover 53 and the case 69 are combined.

  As shown in FIG. 16, the plunger 54 includes a rod portion 54a, a rear block 54b fixed to the rear end of the rod portion 54a, and a rectangular trapezoidal shape (clogged) fixed to the front end of the rod portion 54a. A member 54c, a substantially triangular tip portion 54d formed integrally with the front portion of the base member 54c and having a sharp tip; a first protrusion 54g protruding downward at the rear portion of the base member 54c; A protrusion 55a (see FIG. 21) projecting downward from the center of the guide plate 55 attached to the lower surface of 54c, and a packing 54f.

  Rotating shafts 54e are formed on the left and right side surfaces of the rear block 54b, and are fitted in the bearing holes 51b of the operation unit 51. The rotational movement of the operation unit 51 is transmitted to the rear block 54b through the bearing hole 51b. The rod part 54a transmits the movement of the rear block 54b in the front-rear direction to the base member 54c.

  The front end portion 54d is a plate-like member having a substantially acute triangular side surface protruding from the central member in the left-right direction of the base-like member 54c, and the contour of the upper surface viewed from the side matches the inner surface of the inclined portion 53d of the cover 53. It has become. The lower surface of the front end portion 54d has two horizontal surfaces with steps and an inclined surface connecting the two horizontal surfaces. That is, a first horizontal plane from the tip to the center, a linear first inclined surface extending downward from the end of the first horizontal plane, a second horizontal plane continuing from the end of the first inclined plane, And a second inclined surface that narrows upward from the end of the horizontal plane 2 and reaches the base member 54c.

  The above-described shape of the lower surface of the distal end portion 54d is always in contact with the distal end of a stopper member 59 to be described later, thereby having a function of controlling the vertical movement of the stopper member 59 and having a significant relationship with the on / off timing of the contact. Have

  The first protrusion 54g of the plunger 54 serves to move a protrusion 58e of a reversing member 58 described later. The protrusion 55a engaged with the guide plate 55 is connected to the upper end of the reversing spring 57 by engaging with the plate 56a.

  The packing 54f has a center hole through which the rod portion 54a passes, and is fitted into the joint surface between the cover 53 and the case 69 to prevent dust from entering the switch due to the movement of the plunger 54 in the front-rear direction.

  The guide plate 55 is a rectangular plate that is fitted between the teeth on the lower surface of the base member 54c of the plunger 54, and a projection 55a (see FIG. 21) is engaged with a square opening hole 55b provided at the center thereof. The tip of the protrusion 55a is engaged with the plate 56a.

  Of the two disk-shaped plates 56a and 56b, the upper plate 56a has a recess having a diameter slightly larger than the protrusion 55a (see FIG. 21) at the center. The plate 56a can be tilted freely like a top by making the tip of the projection 55a contact the recess. The longitudinal movement of the plunger 54 is transmitted from the protrusion 55a to the upper end of the reversing spring 57 through the plate 56a.

  Of the two disk-like plates 56a and 56b, the lower plate 56b has a recess having a diameter slightly larger than the protrusion provided on the reversing member 58 at the center thereof. The plate 56b can be tilted freely like a top by touching the round tip of the protrusion of the reversing member 58 in this recess.

  The coiled reversing spring 57 is sandwiched between the two plates 56 a and 56 b with a predetermined pressure. When the plate 56 a is moved by the plunger 54, the coiled reversing spring 57 bends in the front-rear direction and accumulates the spring force. The state in which the most spring force is accumulated is called the reversal point.

  The reversing member 58 includes a curved plate 58a formed by bending a rectangular plate having a length smaller than the inner width in the left-right direction of the cover 53 into an arc shape in a direction perpendicular to the length direction, and an inner surface of the curved plate 58a. Two left and right partition plates 58b provided directly at a distance slightly larger than the diameter of the plate 56b, an elongated pinion 58c provided along the outer surface of the central portion of the curved plate 58a, and upper ends of the two partition plates 58b A protrusion 58d provided on the front part, a protrusion 58e integrally formed on the rear end of the pinion 58c, and a protrusion integrally formed on the front end of the pinion 58c formed on the intermediate part of the two partition plates 58b 58f.

  The two separation plates 58 b accommodate the reversing springs 57. The pinion 58 c has a function of converting the rotational motion of the reversing member 58 into the linear motion of the actuator 61 by engaging with a rack portion 61 a of the actuator 61 described later. The protrusion 58d engages with two holes provided on the inner surface of the cover 53, thereby forming the rotation center of the reversing member 58.

  The reversing member 58 is always subjected to pressure by the reversing spring 57. This pressure is greatest at the reversal point of the reversing spring 57.

  The stopper member 59 is an L-shaped member, and a vertical portion thereof is slidably fitted in a vertical groove provided at the center in the left-right direction of the frontmost portion of the case 69. An inclined surface 59b is formed on the upper end surface of the vertical portion. This upper end surface is in contact with the lower surface of the tip 54d of the plunger 54.

  The horizontal portion of the stopper member 59 protrudes rearward in parallel with the bottom surface of the case 69. On the upper surface of the tip portion of the horizontal portion, a flange portion 59a having an inclination descending from the front to the rear is integrally formed. The flange portion 59a is engaged with the lock portion 85 (see FIG. 21) of the actuator 61.

  The stopper spring 60 is housed in a hole provided in the lower portion of the vertical portion of the stopper member 59, and has a function of always urging the stopper member 59 upward. Therefore, when the plunger 54 moves back and forth, the stopper member 59 moves up and down according to the shape of the lower surface of the distal end portion 54d.

  That is, as shown in FIG. 21, when the upper end of the vertical portion of the stopper member 59 is in contact with the second horizontal surface of the lower surface of the distal end portion 54d of the plunger 54, the stopper member 59 is pushed down against the stopper spring 60. However, as the distal end portion 54d moves rearward, the distal end of the vertical portion rises along the first inclined surface by the extension force of the stopper spring 60. The stopper member 59 stops upward while the upper end of the vertical portion is in contact with the first horizontal surface of the tip end portion 54d.

  The lengths of the horizontal surface and the inclined surface on the lower surface of the tip end portion 54d indicate the engagement time between the flange portion 59a of the stopper member 59 and the lock portion 85 of the actuator 61, that is, the timing of contact separation when the switch is turned off. Designed with consideration.

  The actuator 61 includes a rack portion 61a meshing with the pinion 58c of the reversing member 58, two box-shaped guide portions 61b fixed to the left and right sides of the rack portion 61a, and front ends of the two guide portions 61b. Two movable contact pieces 65 respectively attached to each of the four, and a total of four movable contact points 64a and 64b, two left and right attached respectively to the upper and lower surfaces of the movable contact piece 65, and a box-shaped guide portion 61b. And a contact pressure spring 66 for pressing the movable contact piece 65 from the rear, and an actuator guide lock portion 85 (see FIG. 21) integrally formed on the lower surface of the rack portion 61a.

  The actuator 61 having the above-described configuration is driven by the reversing member 58 on the actuator guide laid in the front-rear direction on the case 69 and horizontally moved in the front-rear direction along with the movable contact piece 65, so that the original of the switch according to the present invention. It has a contact switching function that is a function. That is, when the actuator 61 moves in the forward direction, the movable contacts 64a and 64b of the movable contact piece 65 come into contact with fixed contacts 63 and 67 described later, and when the actuator 61 moves in the backward direction, the movable contacts 64a and 64b move away from the fixed contacts 63 and 67. It will be.

  The two terminals 62 are fixed to both sides of the lower part of the inner front wall of the case 69. The fixed contact 63 is fixed to the terminal hole of each terminal 62 facing rearward. The two fixed contacts 63 correspond to the two lower contacts 64b of the four movable contacts 64a and 64b of the actuator 61.

  On the other hand, the two fixed contacts 67 corresponding to the upper two contacts 64a of the four movable contacts 64a and 64b of the actuator 61 are fixed to the front end portions of the two terminals 68 facing backward. . As shown in FIG. 16, the terminal 68 has a Z-shaped arm, the lower end of the arm is fixed to the left and right lower portions of the rearmost part of the case 69, and the upper end extends forward and upward. The fixed contact 67 is fixed here.

  The case 69 has a box shape, and the inner space is surrounded by the front wall, the rear wall, and the side wall. The side walls are doubled, and the arm of the terminal 68 is accommodated between the two side plates.

  The contact between the movable contacts 64a and 64b and the fixed contacts 63 and 67 is performed at a slow on / off speed by a contact mechanism of a switch including a cooperative operation of the plunger 54, the reversing member 58, the actuator 61 and the like.

  The operation of the contact mechanism of the switch will be described below with reference to FIGS. 22 to 32, (1) and (2) show cross sections in the same state, (1) mainly shows the positional relationship between the movable contact and the fixed contact, and (2) shows the reversing member 58. And the positional relationship of the actuator 61 is shown.

  In FIG. 22, the plunger 54 is biased in the direction of arrow A by the spring force of the return spring 52 in the initial state where the switch is not operated. However, since the distal end portion 54 d of the plunger 54 is restrained by the inner wall of the cover 53, it cannot move. In this state, the reversing member 58 is pressed by the reversing spring 57 and urged counterclockwise. Therefore, the actuator 61 is urged in the B direction, but none can move.

  As shown in FIG. 23, when the operation unit 51 is operated and moved in the direction of the arrow C, the rear block 54b of the plunger 54 is pulled in the D direction, and accordingly, the base member 54c and the lower part of the base member 54c are installed. The protrusion 55a engaged with the guide plate 55 is also pulled in the D direction. Therefore, the protrusion 55a pushes the plate 56a backward to start compressing the reversing spring 57. However, a force is still applied to the reversing member 58 in the direction of maintaining the current state.

  As shown in FIG. 24, when the operation unit 51 is further moved in the C direction, the plunger 54 is further moved in the D direction, and the stopper member 59 is raised along the lower surface of the distal end portion 54d of the plunger 54. When the plunger 54 further moves in the D direction, the protrusion 54g of the plunger 54 and the protrusion 58e of the reversing member 58 come into contact with each other. At this time, the reversing member 58 is still pressed by the reversing spring 57 in the direction to keep the current state.

  When the operation unit 51 is further moved in the C direction, as shown in FIG. 25, the plunger 54 is further pulled in the D direction, and the protrusion 54g of the plunger 54 pushes the protrusion 58e of the reversing member 58 backward. The reversing member 58 rotates in the direction of arrow E, and the rack portion 61a meshing with the pinion 58c of the reversing member 58 moves horizontally in the direction of arrow F. As a result, the contact gap between the movable contacts 64a and 64b and the fixed contacts 63 and 67 is reduced. However, since the reversing spring 57 has not yet exceeded the reversing point, the reversing member 58 does not completely reversal.

  When the operation portion 51 is further moved in the C direction, as shown in FIG. 26, the plunger 54 is further pulled in the D direction, so that the projection 55a engaged with the guide plate 55 moves the upper end of the reversing spring 57 to the D direction. Pull in the direction. Therefore, the stored energy of the reversing spring 57 reaches the reversing point.

  At the reversal point of the reversing spring 57, the reversing member 58 is strongly rotated in the direction of arrow E by the extension force of the reversing spring 57. Along with this, the actuator 61 also moves forward strongly in the direction of arrow F. As a result, the lock portion 85 gets over the slope of the flange portion 59a of the stopper member 59 against the pressure of the stopper spring 60. Then, the actuator 61 moves to a position where the tip end face 89 abuts against the wall of the case 69 and stops.

  At this time, the movable contacts 64a and 64b and the fixed contacts 63 and 67 come into contact, and the switch is turned on. In addition, the movable contact 64 holds the contact pressure of the movable contact 64 by a contact pressure spring 66 in the actuator 61. In this case, since the contact gap is turned on after the contact gap becomes sufficiently small, the bouncing becomes very small.

  Since the pressure at which the reversing spring 57 presses the reversing member 58 is set to be stronger than the pressure of the contact pressure spring 66, the actuator 61 is opposite to the direction of the arrow F, that is, the movable contacts 64a and 64b. And the fixed contacts 63 and 67 do not move in the direction in which the contact pressure decreases.

  FIG. 27 shows a full stroke state in which the operation unit 51 is fully pushed. At this time, the reversing member 58 maintains the state of being biased in the direction of arrow E and the actuator 61 is biased in the direction of arrow F, and the movable contacts 64a and 64b maintain the state of compressing the contact pressure spring 66, and are movable and fixed. Since the contact pressure between the contacts is kept constant, it is not affected by vibration or the like.

  Next, when the force for pressing the operating portion 51 is decreased as shown in FIG. 28 to switch off, the operating portion 51 is moved in the direction of arrow H by the force of the return spring 52 and at the same time the rear block 54b of the plunger 54 is moved to the arrow. Pushed in the I direction. Then, the protrusion 55a engaged with the guide plate 55 presses the plate 56a forward, and starts to compress the reversing spring 57. However, in this state, the reversing member 58 is held while being urged in the direction of arrow E as it is.

  As shown in FIG. 29, when the operation unit 51 further moves in the arrow H direction, the plunger 54 further moves in the arrow I direction, and as a result, approaches the reversal point of the reversing spring 57. When the position is in the vicinity, coupled with the force of the contact pressure spring 66 of the actuator 61, the reversing member 58 tends to be biased in the direction of reversing at once, and between the movable contacts 64a, 64b and the fixed contacts 63, 67. Try to reduce the contact pressure of.

  However, even if the force to move the actuator 61 rearward is applied in this way, due to the locked state due to the engagement between the flange portion 59a of the stopper member 59 pressed by the stopper spring 60 and the lock portion 85 of the actuator 61, The actuator 61 cannot move backward. Therefore, the contact pressure between the movable contacts 64a and 64b and the fixed contacts 63 and 67 remains maintained.

  FIG. 30 shows a state where the operation unit 51 is further moved in the direction of the arrow H. In this state, the reversing spring 57 tries to rotate the reversing member 58 in the direction of the arrow K beyond the reversing point. However, as in the case of FIG. 29, the flange 59a of the stopper member 59 and the locking portion of the actuator 61 The actuator 61 cannot move rearward due to the locked state due to the engagement with 85, and therefore the switch-on state is maintained.

  Further, as the plunger 54 moves in the direction of arrow I, the upper end of the stopper member 59 gradually descends against the elasticity of the stopper spring 60 along the shape of the lower surface of the distal end portion 54d.

  As shown in FIG. 31, when the operation portion 51 further moves in the direction of arrow H, the plunger 54 moves in the direction of arrow I, and the inclined surface on the lower surface of the tip portion 54 d resists the elasticity of the stopper spring 60 on the upper end of the stopper member 59. As a result, the flange portion 59a of the stopper member 59 descends to release the lock portion 85 from the locked state.

  At this time, as described above, since the reversing spring 57 has already accumulated the maximum energy beyond the reversing point, the reversing member 58 instantaneously rotates in the direction of the arrow K when the actuator 61 is released. The actuator 61 meshing with the pinion 58c is rapidly moved in the arrow J direction. As a result, the movable contacts 64a and 64b and the fixed contacts 63 and 67 are rapidly separated from each other and are switched off to return to the initial state as shown in FIG.

  This switch also has a forcible separation mechanism that separates the contacts as described below as long as it does not weld completely even if light welding occurs when the contacts between the movable contacts 64a and 64b and the fixed contacts 63 and 67 are separated. Have.

  When the movable contacts 64a and 64b and the fixed contacts 63 and 67 are lightly bonded, as shown in FIG. 32, the operation unit 51 moves in the direction of arrow H, the plunger 54 moves in the direction of arrow I, and the tip 54d of the plunger 54 As a result, the locked state between the flange portion 59a and the lock portion 85 is released, and the switch is turned off even though the reversing spring 57 exceeds the reversing point. It becomes a state that can not be.

However, the plunger 54 is further pushed in the direction of arrow I by the force of the return spring 52. As a result, the protrusion 54i of the plunger 54 and the protrusion 58f of the reversing member 58 come into contact with each other, and the reversing member 58 rotates in the arrow K direction. Let Therefore, the actuator 61 is moved in the arrow J direction by the reversing member 58, and the movable contacts 64 a and 64 b are separated from the fixed contacts 63 and 67.
Japanese Patent Laid-Open No. 2003-162930 (pages 5 to 8 and FIG. 5)

However, the switch described in the prior art has a structure suitable for a large current of AC and DC. However, when a considerable number of opening / closing operations are performed, the contact is consumed, the contact surface is rough, and the contact is unstable. There is a problem of becoming.
Therefore, there is a problem to be solved by a contact mechanism that can maintain a good contact state even if the opening / closing operation is considerably performed and the contact becomes rough and the contact becomes unstable.

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

(1) The trigger switch has an opening surface and a pair of fixed contacts arranged in the same direction in a box-shaped case, a movable contact that contacts / separates from the pair of fixed contacts, and the movable switch An actuator having a pressing spring that presses the contact from the rear, a rotatable reversing member that drives the actuator, and a coiled reversing point that has one end connected to the reversing member and the other end engaged with a plunger. A spring reversing type having a reversing spring and an operating part for moving the plunger, and pressing / releasing the operating part to bring the movable contact into / out of contact with the pair of fixed contacts. In the switch, when the switch is turned on, the actuator is moved by a certain amount before the reversing point to shorten the contact interval, and then the reversing member is reversed. The movable contact is brought into contact with the pair of fixed contacts, and the auxiliary contact provided in the actuator is connected to one fixed contact of the pair of fixed contacts and the other fixed contact. The actuator is electrically contacted so as to straddle the sliding plate portion continuously provided, and when the switch is turned off, the movement of the actuator is stopped before the reversing point, and then the actuator is stopped after the reversing point. The movable contact is separated from the fixed contact by releasing, and the auxiliary contact provided in the actuator is connected to one fixed contact of the pair of fixed contacts and the other fixed contact Is removed from the electrically contacted state so as to straddle the sliding plate portion that is continuously provided.
(2) The trigger switch according to (1), comprising a pinion formed on the reversing member and a rack formed on the actuator.
(3) A protrusion provided on the plunger and a protrusion provided on the reversing member, and when the operation portion is pressed, the protrusion of the plunger presses the protrusion of the reversing member and the reversing spring. The trigger switch according to (1), wherein the actuator is moved by rotating the reversing member against the force of the force to move the movable contact to a fixed contact.
(4) A surface having a gentle step provided on the lower surface of the distal end portion of the plunger, a stopper member that always contacts the step surface, a flange provided on the stopper member, and the stopper member A stopper spring for biasing to the actuator, and a protrusion provided on the actuator, and the stopper member moves along the stepped surface of the plunger so that the flange portion of the stopper member and the protrusion of the actuator are engaged. The trigger switch according to (1), wherein is placed in a locked state or an open state.
(5) When the switch is turned on, the stopper member is raised, and the projection of the actuator moves over the flange of the stopper member to contact the movable contact and the fixed contact. The trigger switch according to (2), wherein the engagement state with the projection of the actuator is a locked state.
(6) In the locked state, even if the operating portion is moved in the switch-off direction to move the plunger, and the reversing point of the reversing spring is exceeded, the shape of the lower surface of the tip of the plunger does not release for a while. Further, when the reversing spring exceeds the reversing point and moves the operating portion in the switch-off direction, the stopper member is lowered by the lower surface of the distal end portion of the plunger and the locking means is released, and as a result, the actuator The trigger switch according to (1), wherein the movable contact is instantly moved and the movable contact is instantly separated from the fixed contact and switched off.

  The trigger switch according to the present invention utilizes a spring reversing type quick entry / breaking function, and when the switch is turned on, the movable contact is made sufficiently close to the fixed contact before the reversing point of the spring so as to match the timing of quick entry after the reversing point. The auxiliary contact can be in a conductive state by connecting the sliding plate portion connected to the pair of fixed contacts in a non-potential state, so that there is no potential between the movable contact and the fixed contact. Even when the contact state changes, the auxiliary contact can maintain the contact state well, and as a result, the contact state between the fixed contact and the movable contact can be maintained well.

  An embodiment of a trigger switch according to the present invention will be described with reference to the drawings. In addition, the same code | symbol is attached | subjected and demonstrated to the same thing as what was demonstrated by the prior art.

  The trigger switch of the present invention has substantially the same shape as the trigger switch described in the prior art, and particularly the appearance is the same. Therefore, the trigger switch will be described with reference to the drawings cited in the prior art, and the difference is the assistance to the actuator. The difference is that the auxiliary contact is configured to conduct across the plate portion by forming the plate portion of the terminal having the contact and having the fixed contact long. These differences will be mainly described, and other details will be referred to those described in the prior art. In the description, the left side is the front of the switch and the right side is the back of the switch in the description.

  As shown in FIG. 1, the trigger switch 50 according to the present invention includes an operation unit 51 that can be operated with a hand grip force, two return springs 52 housed inside the operation unit 51, and an operation state of the operation unit 51. A cover 53 that accommodates a plunger 54 that is a mechanism for transmitting the operation, a plunger 54 that transmits the operation state of the operation unit 51 to the actuator 61, a guide plate 55 that reversely guides the reversing member 58, and a reversal Two plates 56a and 56b provided at both ends of the spring 57, a reversing spring 57 for reversing the reversing member 58 based on the operation state of the operation unit 51, and a reversing member for linearly moving the actuator 61 in the same direction as the rotation direction. 58, a stopper member 59 that locks the actuator 61 with the movable contact pieces 65a and 65b in contact with each other, a stopper spring 60, and a reversing member 58. An actuator 61 that linearly moves in the same direction as the rotation direction based on the rotation operation, two first and second terminals 62A and 62B that are electrically connected to the outside, and two fixed contacts 63A and 63B. Two movable contacts 64a and 64b are attached to the movable contact pieces 65a and 65b, and a total of four movable contacts 64a and 64b, and two movable contacts 64a and 64b are always urged by the contact pressure springs 66a and 66b. The movable contact pieces 65a and 65b, the two contact pressure springs 66a and 66b that keep the movable contact pieces 65a and 65b constantly biased, and the two pieces provided on the third and fourth terminals 68A and 68B. Fixed contacts 67A and 67B, two third and fourth terminals 68A and 68B electrically connected to the outside, and a case 69 formed of an insulating member and having a box shape with an upper opening. Configured.

  When the components are assembled as indicated by the alternate long and short dash line shown in FIG. 1, switches as shown in FIGS. 2 to 6 are formed. Hereinafter, the configuration and function of each component and the relationship between each component and other components will be described with reference to FIGS. 1, 2, 3, 17, 18, and 21.

  The operation unit 51 is a part that is operated by a user's hand of the trigger switch 50, and is switched on when pressed from above and switched off when released.

  The operation unit 51 includes an upper surface bent in the shape of a hand, left and right side surfaces and a front surface integrally formed with the upper surface, and an open rear surface and lower surface, and is formed in a hollow case shape as a whole. Two holes 51 a are provided in the left and right side surfaces of the rear portion of the operation portion 51, and engage with a protrusion 53 a provided at the rearmost portion of the cover 53, thereby connecting the operation portion 51 and the cover 53.

  In addition, two bearing holes 51b are provided on the left and right side surfaces of the operation portion 51, and a rotation shaft 54e of a plunger 54 described later is rotatably fitted therein. Further, a bowl-shaped through hole 51c is provided on both side surfaces of the operation unit 51 for convenience of use. Further, two protrusions 51d (see FIG. 2) for holding the upper end of the return spring 52 are provided inside the upper plate of the operation portion 51.

  The two coiled return springs 52 are always urged in the extending direction, their upper ends are fixed by projections 51d (see FIG. 2) of the operation unit 51, and their lower ends are on the bottom of a cover 53 to be described later. It is fixed by two provided projections 53b (see FIG. 2).

  As shown in FIGS. 1 and 2 to 3, the cover 53 has a function divided into a front half part and a rear half part. As shown in FIGS. 2 and 3, the latter half portion has a function of holding the lower end of the return spring 52 by the protrusion 53 b and coupling with the rear end portion of the operation portion 51.

  The front half of the cover 53 serves as a lid for the case 69 and covers the plunger 54. The inclined portion 53d provided at the foremost portion of the cover 53 forms a space in which the sharp tip portion 54d of the plunger 54 moves back and forth.

  As shown in FIGS. 17 and 18, the left and right side plates of the cover 53 are placed outside the left and right side plates of the case 69, and the two claws 69a of the case 69 are fitted into the two through holes 53e. The cover 53 and the case 69 are combined.

  As shown in FIGS. 1, 2 and 3, the plunger 54 has a bar portion 54a, a rear block 54b fixed to the rear end of the bar portion 54a, and a rectangular shape fixed to the front end of the bar portion 54a. A trapezoidal (clog-like) member 54c, a substantially triangular tip 54d with a pointed tip formed integrally with the front of the trapezoid 54c, and a first protrusion protruding downward at the rear of the trapezoid 54c 54g, a protrusion 55a (see FIG. 3) protruding downward from the center of the metal guide plate 55 attached to the lower surface of the base member 54c, and a packing 54f.

  A rotation shaft 54e (see FIG. 1) is formed on the left and right side surfaces of the rear block 54b, and is fitted in the bearing hole 51b of the operation unit 51. The rotational movement of the operation unit 51 is transmitted to the rear block 54b through the bearing hole 51b. The rod part 54a transmits the movement of the rear block 54b in the front-rear direction to the base member 54c.

  The front end portion 54d is a plate-like member having a substantially acute triangular side surface protruding from the central member in the left-right direction of the base-like member 54c, and the contour of the upper surface viewed from the side matches the inner surface of the inclined portion 53d of the cover 53. It has become. The lower surface of the front end portion 54d has two horizontal surfaces with steps and an inclined surface connecting the two horizontal surfaces. That is, a first horizontal plane from the tip to the center, a linear first inclined surface extending downward from the end of the first horizontal plane, a second horizontal plane continuing from the end of the first inclined plane, And a second inclined surface that narrows upward from the end of the horizontal plane 2 and reaches the base member 54c.

  The shape of the lower surface of the tip 54d is always in contact with the tip (inclined surface 59b) of a stopper member 59, which will be described later, thereby having the function of controlling the vertical movement of the stopper member 59 and turning the contact on / off. Has a critical relationship with timing.

  The protrusion 55a engaged with the guide plate 55 is connected to the upper end of the reversing spring 57 by engaging with the plate 56a.

  The packing 54f has a center hole through which the rod portion 54a passes, and is fitted into the joint surface between the cover 53 and the case 69 to prevent dust from entering the switch due to the movement of the plunger 54 in the front-rear direction.

  The guide plate 55 is a rectangular plate that is fitted between the teeth on the lower surface of the base member 54c of the plunger 54, and a projection 55a (see FIG. 3) is engaged with a square opening hole 55b provided in the center thereof. The tip of the protrusion 55a is engaged with the plate 56a.

  Of the two disk-shaped plates 56a and 56b, the upper plate 56a has a recess having a diameter slightly larger than the protrusion 55a (see FIG. 21) at the center. The plate 56a can be freely tilted like a top by the tip of the projection 55a coming into contact with the recess. The longitudinal movement of the plunger 54 is transmitted from the protrusion 55a to the upper end of the reversing spring 57 through the plate 56a.

  Of the two disk-like plates 56a and 56b, the lower plate 56b has a recess having a diameter slightly larger than the protrusion provided on the reversing member 58 at the center thereof. The plate 56b can be tilted freely like a top by touching the round tip of the protrusion of the reversing member 58 in this recess.

  The coiled reversing spring 57 is sandwiched between the two plates 56 a and 56 b with a predetermined pressure. When the plate 56 a is moved by the plunger 54, the coiled reversing spring 57 bends in the front-rear direction and accumulates the spring force. The state in which the most spring force is accumulated is called the reversal point.

  The reversing member 58 includes a curved plate 58a formed by bending a rectangular plate having a length smaller than the inner width in the left-right direction of the cover 53 into an arc shape in a direction perpendicular to the length direction, and an inner surface of the curved plate 58a. Two left and right partition plates 58b provided directly at a distance slightly larger than the diameter of the plate 56b, an elongated pinion 58c provided along the outer surface of the central portion of the curved plate 58a, and upper ends of the two partition plates 58b And a protrusion 58d provided on the portion.

  The two separation plates 58 b accommodate the reversing springs 57. The pinion 58 c has a function of converting the rotation of the reversing member 58 into a linear motion in the front-rear direction of the actuator 61 by engaging with a rack portion 61 c of the actuator 61 described later. The protrusion 58d engages with two holes provided on the inner surface of the cover 53, thereby forming the rotation center of the reversing member 58.

  The reversing member 58 is always subjected to pressure by the reversing spring 57. This pressure is greatest at the reversal point of the reversing spring 57.

  The stopper member 59 is formed in an L shape as a whole, and a vertical portion thereof is slidably fitted in a vertical groove provided at the center in the left-right direction of the foremost part of the case 69. An inclined surface 59b is formed on the upper end surface of the vertical portion. This upper end surface is in contact with the lower surface of the tip 54d of the plunger 54.

  The horizontal portion of the stopper member 59 protrudes rearward in parallel with the bottom surface of the case 69. On the upper surface of the tip portion of the horizontal portion, a flange portion 59a having an inclination descending from the front to the rear is integrally formed. The flange portion 59a is engaged with the lock portion 85 (see FIG. 5) of the actuator 61.

  The stopper spring 60 is housed in a hole provided in the lower portion of the vertical portion of the stopper member 59, and has a function of always urging the stopper member 59 upward. Therefore, when the plunger 54 moves back and forth, the stopper member 59 moves up and down according to the shape of the lower surface of the distal end portion 54d.

  That is, for example, as shown in FIG. 2, when the upper end of the vertical portion of the stopper member 59 is in contact with the second horizontal surface of the lower surface of the distal end portion 54 d of the plunger 54, the stopper member 59 is against the stopper spring 60. Although being pushed down, the tip of the vertical portion rises along the first inclined surface by the extension force of the stopper spring 60 as the tip 54d moves rearward. The stopper member 59 stops upward while the upper end of the vertical portion is in contact with the first horizontal surface of the tip end portion 54d.

  The lengths of the horizontal surface and the inclined surface on the lower surface of the tip end portion 54d indicate the engagement time between the flange portion 59a of the stopper member 59 and the lock portion 85 of the actuator 61, that is, the timing of contact separation when the switch is turned off. Designed with consideration.

As shown in FIGS. 1, 4 and 5, the actuator 61 includes a rack portion 61c formed by arranging racks 88 in a horizontal direction that meshes with the pinion 58c of the reversing member 58, and an integrated left and right side of the rack portion 61c. Two box-shaped guide portions 61a and 61b formed, movable contact pieces 65a and 65b attached to the front ends of the two guide portions 61a and 61b, and front surfaces of the movable contact pieces 65a and 65b, respectively. A total of four movable contacts 64a and 64b, two left and right respectively attached to the top and bottom, and contact pressure springs 66a that are housed in box-shaped guide portions 61a and 61b and press the movable contact pieces 65a and 65b from the rear. 66b and the auxiliary contacts 83a and 83b integrally formed on the lower surface of the lower position of the guide portions 61a and 61b are engaged with each other while being urged by the spring pressure of the auxiliary springs 84a and 84b. Auxiliary contact engaging part 61d, has a configuration which includes a 61e. The distal end portions where the movable contact pieces 65a and 65b of the guide portions 61a and 61b are always urged and held by the urging force of the contact pressure springs 66a and 66b are the distal end locking portions 89a and 89b. The movable contacts 64a and 64b of the pieces 65a and 65b come into contact with the fixed contacts 63A, (63B), 67A (, 67B) (see FIG. 14) and are further pushed in to increase the biasing force by the contact pressure springs 66a, 66b. Function as a stopper.
On the bottom surface of the rack portion 61c, a lock portion 85 (see FIG. 5) formed by a convex portion inclined on one side for locking with the flange portion 59a of the stopper member 59 is provided, and an end opposite to the lock portion 85 on the same bottom surface. It has a structure in which an engaging projection 86 is provided on the part. A separate member slider 87 is attached to the bottom surface sandwiched between the lock portion 85 and the engaging convex portion 86.

  The auxiliary contacts 83a and 83b are formed of a conductive member in a substantially U shape, and when one end of the U shape is inserted into the engagement hole 89 of the auxiliary contact engaging portions 61d and 61e, A hook that can be removed is formed at the tip, and the outer surface of the central end functions as a contact piece, and the auxiliary springs 84a and 84b are engaged with the inner surface, so that the auxiliary contact engaging portions 61d and 61e are cantilevered. It becomes the structure engaged by.

  The actuator 61 having the above structure is driven by the reversing member 58 on the actuator guide laid in the front-rear direction on the case 69 and horizontally moved in the front-rear direction with the movable contacts 64a, 64b. It has a contact switching function that is an original function. That is, when the actuator 61 moves in the forward direction, the movable contacts 64a and 64b come into contact with fixed contacts 63A and 67A, which will be described later, and when moved in the backward direction, the movable contacts 64a and 64b move away from the fixed contacts 63A and 67A.

As shown in FIG. 6, the first terminal 62A is formed by bending a conductive member into an L shape, and includes an external connection terminal portion 90b formed in a flat plate having a screw hole 90a at the center. A base portion 90c formed by bending the external connection terminal portion 90b at a right angle, a left end portion of the base portion 90c is further bent at a right angle to form an engagement plate portion 90d, and further connected to the bent engagement plate portion 90d. The contact portion 90e is provided with a contact 63A by bending the surface at a right angle, and the auxiliary contact sliding plate portion 81A is formed by further bending the lower end of the contact portion 90e in a right angle direction.
The second terminal 62B has a symmetrical shape with the first terminal 62A, is formed by bending the conductive member into an L shape, and is formed in a flat plate having a screwing hole 90a in the center. A connecting portion 90b, a base portion 90c formed by bending the external connecting terminal portion 90b at a right angle; a right end portion of the base portion 90c is further bent at a right angle to form an engagement plate portion 90d; The surface continuous with the plywood portion 90d is bent at a right angle to form a contact portion 90e provided with a contact 63B, and the lower end of the contact portion 90e is further bent at a right angle to form an auxiliary contact sliding plate portion 81B. ing.
The third terminal 68A has a flat contact portion 90e having a contact 67A, the left end portion of the contact portion 90e is bent in a right angle direction to form a bent portion as an engagement plate portion 90d, and is connected to the engagement plate portion 90d. The substantially rectangular flat plate portion 90f is formed, and the end portion farthest from the contact portion 90e of the flat plate portion 90f is bent at a right angle to form the auxiliary contact sliding plate portion 82A. This auxiliary contact sliding plate The right end portion of the portion 82A is bent at a right angle, and an external connection terminal portion 90b having a screwing hole 90a for screwing an external terminal is provided.
The fourth terminal 68B has a symmetrical shape with the third terminal 68A, has a flat contact portion 90e having a contact 67B, and the right end portion of the contact portion 90e is bent in a right angle direction. Is formed as an engaging plate portion 90d, and a substantially rectangular flat plate portion 90f connected to the engaging plate portion 90d is formed, and the end portion farthest from the contact portion 90e of the flat plate portion 90f is bent at a right angle to form an auxiliary contact. A sliding plate portion 82B is formed, and an external connection terminal portion 90b having a screwing hole 90a for screwing an external terminal by bending the right end portion of the auxiliary contact sliding plate portion 82B at a right angle. .

As shown in FIG. 6, the case 69 arranges and fixes the first to fourth terminals 62A, 62B, 68A, 68B having the above-described fixed contacts 63A, 63B, 67A, 67B, and movable contacts 64a, 64b. Is formed in an insulating resin and is formed in a box shape having an upper opening, and the inside thereof includes first to fourth terminals 62A, 62B, 68A, 68B can be accommodated, and includes a support wall 91a that arranges the external connection terminal portion 90b of the first terminal 62A on the outside, and includes an inner wall 92a in the longitudinal direction, this support wall 91a, A space sandwiched between the actuator guides 93 that form the convex portions of the filaments provided in the center forms the first terminal accommodating portion 94. The second terminal accommodating portion 95 is formed in a space between the first terminal accommodating portion 94 and the actuator guide 93 adjacent to the adjacent inner wall 92b in the longitudinal direction, the support wall 91b, and the actuator guide 93. .
Then, at a position facing the first terminal accommodating portion 94, the third terminal accommodating portion is located in a space sandwiched between the actuator guide 93 and the inner wall 92a with the external connection terminal portion 90b of the third terminal 68A facing outward. 96 is formed.
Further, at a position facing the second terminal accommodating portion 95, the external connection terminal portion 90b of the fourth terminal 68B faces the outside, and the fourth terminal accommodating portion is in a space sandwiched between the actuator guide 93 and the inner wall 92b. 97 is formed.
In order to engage and fix the first to fourth terminals 62A, 62B, 68A, 68B to the case 69 having such a configuration, first, as shown in FIG. 7, the first terminal 62A is connected to the first terminal. It accommodates in the accommodating part 94. That is, the fixed contact 63A is arranged and fixed in a state where the external contact terminal portion 90b of the first terminal 62A is engaged with the slit of the inner wall 92a and pushed inward.

Next, as shown in FIG. 8, the second terminal 62 </ b> B is accommodated in the second terminal accommodating portion 95. That is, the external connection terminal portion 90b of the second terminal 62B is engaged with the slit of the inner wall 92b and pushed in, so that the fixed contact 63B is arranged and fixed in a state of facing inward. Further, the third terminal 68 </ b> A is accommodated in the third terminal accommodating portion 96. That is, when the external connection terminal portion 90b of the third terminal 68A is engaged with the slit of the inner wall 92a and pushed in, the fixed contact 67A is arranged and fixed in a state of facing inward.
Next, as shown in FIG. 9, the fourth terminal 68 </ b> B is accommodated in the fourth terminal accommodating portion 97. That is, when the external connection terminal portion 90b of the fourth terminal 68B is engaged with the slit of the inner wall 92b and pushed in, the fixed contact 67B is arranged and fixed in a state of facing inward.
The four terminals 62A, 62B, 68A, 68B are housed and fixed in the case 69 in this way, so that the fixed contacts 63A, 63B, 67A, 67B are arranged in the same direction, and the auxiliary contacts are slid. The auxiliary contact sliding plate portions 81 </ b> A, 81 </ b> B, 82 </ b> A, and 82 </ b> B that move are arranged on the bottom surface of the case 69. In this state, when the actuator is inserted from the opening of the case 69, the movable contact is disposed in a state of facing the fixed contact, and the auxiliary contact is disposed in contact with the upper portion of the auxiliary contact sliding plate portion.

  The contact between the movable contacts 64a and 64b and the fixed contacts 63 and 67 is performed at a slow on / off speed by a contact mechanism of a switch including a cooperative operation of the plunger 54, the reversing member 58, the actuator 61 and the like.

  The operation of the contact mechanism of the switch according to the present invention will be described below with reference to FIGS.

  In FIG. 10, when the switch is not operated, the plunger 54 is urged in the direction of arrow A by the spring force of the return spring 52. However, since the distal end portion 54 d of the plunger 54 is restrained by the inner wall of the cover 53, it cannot move. In this state, the reversing member 58 is pressed by the reversing spring 57 and urged counterclockwise. Therefore, the actuator 61 on the actuator guide 93 is urged in the B direction, but none can move. . At this time, the auxiliary contact 83a is stopped while maintaining the state of contact with the auxiliary contact sliding plate portion 82A of the third terminal 68A. Similarly, although not shown, the auxiliary contact 83b is also stopped while maintaining the state of being in contact with the auxiliary contact sliding plate portion 82B of the fourth terminal 68B.

  In this state, when the operation unit 51 is retracted and moved in the C direction, as shown in FIG. 11, the plunger 54 is pulled in the D direction, whereby a protrusion 55a positioned at the upper end of the reversing spring 57 of the reversing member 58. Pull in the same D direction (right direction in the figure). Therefore, the stored energy of the reversing spring 57 reaches the reversing point.

  At the reversal point of the reversing spring 57, the reversing member 58 is strongly rotated in the direction of arrow E by the extension force of the reversing spring 57. When the reversing member 58 rotates in the direction of arrow E (leftward in the figure), the rack 88 of the rack portion 61c that meshes with the pinion 58c of the reversing member 58 moves horizontally in the direction of arrow E. As a result, the movable contacts 64a and 64b come into contact with the fixed contacts 67A and 63A. At this time, the auxiliary contact 83a is still in contact with the auxiliary contact sliding plate portion 82A of the third terminal 68A and the partition portion of the case 69. In addition, since the lock portion 85 of the actuator 61 is placed on the upper portion of the flange portion 59a of the stopper member 59, the contact state between the fixed contacts 67A and 63A and the movable contacts 64a and 64b is determined by the push operation condition of the operation portion 51. The contact state is not locked and the urging force of the movable contacts 64a and 64b by the contact pressure spring 66a is a normal urging force.

  When the operating portion is further pushed in, as shown in FIG. 12, the contact pressure spring 66a is compressed and fixed by further moving the actuator 61 horizontally while the fixed contacts 67A and 63A and the movable contacts 64a and 64b are in contact with each other. The contact pressure between the contacts 67A and 63A and the movable contacts 64a and 64b is further increased. At the same time, the auxiliary contact 83a straddles and contacts the auxiliary contact sliding plate portion 82a of the third terminal 68A and the auxiliary contact sliding plate portion 81a of the first terminal 62A. At this time, since the fixed contacts 67A and 63A and the movable contacts 64a and 64b are in contact with each other, there is no electric potential between the auxiliary contact sliding plate portions 81a and 82a. do not do.

  Further, when the operating portion 51 is pushed in, as shown in FIG. 13, the auxiliary contact sliding plate portion 82A and the auxiliary contact sliding plate portion 81A are now brought into contact with the auxiliary contact 83a, so that the flange portion 59C is brought into contact with the flange portion 59C. The lock portion 85 is fitted and the movement of the actuator 61 in the horizontal pushing direction is locked, so that the fixed contact and the movable contact are locked while the urging force by the contact pressure spring 66a is maintained in a constant state. Can maintain contact.

Further, in the case of a full stroke when the operation unit 51 is pushed in, as shown in FIG. 14, the actuator 61 moves in the horizontal direction and the state of the collar portion 59 </ b> C and the lock portion 85 is slightly removed, but the locked state is maintained. In this state, the contact state between the fixed contacts 67A and 63A and the movable contacts 64a and 64b is maintained, and the contact state between the auxiliary contacts 83a is also maintained.
Thus, when the state where the operation unit 51 is turned on is maintained, the fixed contacts 67A and 63A and the movable contacts 64a and 64b are locked and the auxiliary contact 83a is connected to the sliding plate portions 81A and 82A. Thus, it is possible to maintain a state of electrical contact in a state of straddling.

Now, when the operation unit 51 is pushed in and released from the full stroke state to loosen the hand pushing state and is moved away from the operation unit 51, the return of the return spring 52 provided in the operation unit 51 causes the operation unit to return to the original state. The tip 54d of the plunger 54 moves leftward in the drawing and pushes the inclined surface 59b at the top of the stopper 59 in an attempt to return to the state. Then, the locking portion 85 that is locked to the flange portion 59c of the stopper portion 59 is released, and the fixed contact 67A, 63A and the movable contact 64a, 64b move in a direction to release the contact state due to the restoring force of the contact pressure springs 66a, 66b. In this state, when the operation unit 51 further returns to the original state, the fixed contact 67A, 63A and the movable contact are separated by being pulled by the plunger 54 and the reversing member 58 is rotated and reversed to the original state.
However, before the movable contacts 64a and 64b and the fixed contacts 67A and 63A are separated from each other, the auxiliary contact 83a is moved by the actuator 61 from the state of being in electrical contact across the sliding plate portions 81A and 82A. Therefore, since there is no electric potential between the sliding plate portions 81A and 82A, no arc is generated in the auxiliary contact 83a, and no contact roughening occurs.

  As described above, it has been described in time series that the fixed contacts 67A and 63A are brought into contact with the movable contacts 64a and 64b and the auxiliary contact 83a is brought into contact with each other by operating the operation unit 51. Since the switch connection mechanism is the same as that described in the prior art, those lacking description can be supplemented with those described there.

  FIG. 15 shows an electric tool provided with the trigger switch 50 of the present invention. The trigger switch 50 is housed in a position where one hand is gripped, and an AC voltage is supplied from the outside. Is operated to rotate the motor M through the transmission gear G.

  Utilizing the spring reversal type quick turn-off function, when the switch is turned on, the movable contact is brought close enough to the fixed contact before the spring reversal point, and connected to the pair of fixed contacts at the timing of quick entry after the reversal point. By making the auxiliary contact in the conductive state in the sliding plate part installed, the auxiliary contact can be in the conductive state with no potential, and even if the contact state between the contacts changes, this Provided is a trigger switch capable of maintaining a good contact state between a fixed contact and a movable contact as a result of being able to maintain a good contact state with an auxiliary contact.

It is a disassembled perspective view of one Example of the trigger switch which concerns on this invention. FIG. 3 is a partial cross-sectional view of the trigger switch. FIG. 3 is a partial cross-sectional view of the trigger switch. It is a perspective view of a part of actuator which constitutes a trigger switch same as the above. It is a perspective view of a part of actuator which constitutes a trigger switch same as the above. It is a perspective view of a part of cases which constitute a trigger switch. It is explanatory drawing which showed a mode that a terminal was accommodated in the case which comprises a trigger switch. It is explanatory drawing which showed a mode that a terminal was accommodated in the case which comprises a trigger switch. It is explanatory drawing which showed a mode that a terminal was accommodated in the case which comprises a trigger switch. It is explanatory drawing which showed the state of the switch when an operation part is OFF similarly. It is explanatory drawing which showed the state of the switch when a contact was touched by operating an operation part. It is explanatory drawing which showed the state which pushed further, when the operation part was operated and the contact contacted, and made the auxiliary contact electrically contact the sliding plate part. It is explanatory drawing which shows the state which operated the operation part, the contact contacted, the auxiliary contact contacted further, and pushed further, and the stopper locked. It is explanatory drawing which operated the operation part and showed the state of full stroke. It is explanatory drawing which showed the electric tool provided with the trigger switch similarly. It is a disassembled perspective view of the trigger switch in a prior art. It is a side view of a trigger switch. It is a whole perspective view of a trigger switch. It is a horizontal partial cross section figure of the trigger switch in a prior art. It is a horizontal partial cross section figure of the trigger switch in a prior art. It is a horizontal partial cross section figure of the contact mechanism of the trigger switch in a prior art. It is a horizontal partial cross section explaining operation | movement of the contact mechanism of the trigger switch in a prior art. It is a horizontal partial cross section explaining operation | movement of the contact mechanism of the trigger switch in a prior art. It is a horizontal partial cross section figure explaining operation | movement of the contact mechanism of the trigger switch in a prior art. It is a horizontal partial cross section explaining operation | movement of the contact mechanism of the trigger switch in a prior art. It is a horizontal partial cross section explaining operation | movement of the contact mechanism of the trigger switch in a prior art. It is a horizontal partial cross section explaining operation | movement of the contact mechanism of the trigger switch in a prior art. It is a horizontal partial cross section explaining operation | movement of the contact mechanism of the trigger switch in a prior art. It is a horizontal partial cross section explaining operation | movement of the contact mechanism of the trigger switch in a prior art. It is a horizontal partial cross section explaining operation | movement of the contact mechanism of the trigger switch in a prior art. It is a horizontal partial cross section figure explaining operation | movement of the contact mechanism of the trigger switch in a prior art. It is a horizontal partial cross section figure explaining operation | movement of the contact mechanism of the trigger switch in a prior art.

Explanation of symbols

50 Trigger switch 51 Operation part 51a Hole 51b Bearing hole 51c Through hole 51d Projection 52 Return spring 53 Cover 53a Projection 53b Projection 53d Inclined part 53e Plunger 54a Bar part 54b Rear block 54c Trapezoidal member 54d Tip part 54e Rotating shaft 54g First protrusion 54f Packing 55 Guide plate 55a Protrusion 55b Opening hole 56a Plate 56b Plate 57 Reversing spring 58 Reversing member 58a Curved plate 58b Separating plate 58c Pinion 58d Protrusion 59 Stopper member 59a Ridge part 60 Stopper spring 61 Actuator 61a Guide part 61b Guide Part 61c rack part 61d auxiliary contact engaging part 61e auxiliary contact engaging part 62A first terminal 62B second terminal 63A fixed contact 63B fixed contact 64a movable contact 64b movable contact 65a movable contact piece 65b possible Contact piece 66a Contact pressure spring 66b Contact pressure spring 67A Fixed contact 67B Fixed contact 68A Third terminal 68B Fourth terminal 69 Case 69a Claw 81A Sliding plate portion 82A Auxiliary contact sliding plate portion 82B Auxiliary contact sliding plate portion 83a Auxiliary contact 83b Auxiliary contact 84a Auxiliary spring 84b Auxiliary spring 85 Locking part 86 Engaging convex part 87 Slider 88 Rack 89a Tip locking part 89b Tip locking part 90a Screwing hole 90b External connection terminal part 90c Base part 90d Engaging plate part 90e Contact Portion 91a Support wall 91b Support wall 92a Inner wall 93 Actuator guide 94 First terminal accommodating portion 95 Second terminal accommodating portion 96 Third terminal accommodating portion 97 Fourth terminal accommodating portion

Claims (6)

A pair of fixed contacts arranged in the same direction in a box-shaped case having an opening surface;
An actuator having a movable contact that contacts / separates from the pair of fixed contacts and a pressing spring that presses the movable contact from behind;
A rotatable reversing member for driving the actuator;
A reversing spring having a coiled reversing point that has one end connected to the reversing member and the other end engaged with a plunger;
An operation unit for moving the plunger,
In a spring reversing type switch that switches on / off by pressing / releasing the operating portion to bring the movable contact into contact with or separated from the pair of fixed contacts,
When the switch is turned on, the actuator is moved by a certain amount before the reversing point to shorten the contact interval, and then the reversing member is reversed to bring the movable contact into contact with the pair of fixed contacts, and the actuator is provided. The auxiliary contact is electrically contacted so as to straddle the sliding plate part connected to one of the fixed contacts and the sliding plate part connected to the other fixed contact. ,
When the switch is turned off, the movement of the actuator is stopped before the reversal point, and then the actuator is released after the reversal point so that the movable contact is separated from the fixed contact, and the auxiliary provided for the actuator The contact is electrically contacted so as to straddle the sliding plate portion connected to one of the pair of fixed contacts and the sliding plate portion connected to the other fixed contact. Trigger switch characterized by removing from the state. The trigger switch according to claim 1, further comprising a pinion formed on the reversing member and a rack formed on the actuator. A protrusion provided on the plunger and a protrusion provided on the reversing member, and when the operation portion is pressed, the protrusion of the plunger presses the protrusion of the reversing member, and the force of the reversing spring 2. The trigger switch according to claim 1, wherein the actuator is moved by rotating the reversing member against the moving contact to approach the fixed contact. A surface having a gentle step provided on the lower surface of the distal end portion of the plunger, a stopper member that is always in contact with the step surface, a flange provided on the stopper member, and urging the stopper member upward A stopper spring and a protrusion provided on the actuator, and the stopper member moves along the stepped surface of the plunger, thereby locking the engagement state between the flange of the stopper member and the protrusion of the actuator. The trigger switch according to claim 1, wherein the trigger switch is placed in an open state. When the switch is turned on, the stopper member is raised, and the projection of the actuator travels over the collar part of the stopper member to contact the movable contact and the fixed contact. At that time, the collar part and the actuator The trigger switch according to claim 4, wherein the engagement state with the protrusion is a locked state. In the locked state, the operation unit is moved in a switch-off direction to move the plunger, and even if the reversing point of the reversing spring is exceeded, the shape of the lower surface of the tip of the plunger does not release the device for a while. When the reversing spring passes the reversing point and moves the operating portion in the switch-off direction, the stopper member is lowered by the lower surface of the tip of the plunger and the locking means is released, so that the actuator is immediately The trigger switch according to claim 1, wherein the trigger switch moves and the movable contact instantly leaves the fixed contact and is switched off.

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