TWI811016B - trigger switch - Google Patents

Abstract

A trigger switch is suitable for being installed in an electric tool. The trigger switch includes a housing unit, a control unit, a trigger unit and a steering unit. The control unit includes a circuit board and a Hall element. The trigger unit is used to drive the electric tool and includes a sliding seat and a trigger group. The sliding seat has a magnetic strip seat and a magnetic strip. The magnetic strip seat part has a mounting hole for the magnetic strip to be disposed. The trigger group is used to drive the sliding seat to move. The steering unit is used to change the rotation direction of the electric tool. By extending the magnetic strip seat portion of the trigger unit toward a direction away from the Hall element along a front-rear direction, the magnetic strip with a larger size can be provided to increase the magnetic force of the magnetic strip, thereby improving the relationship between the Hall element and the Hall element. The magnetic induction between the magnetic strips changes to improve the use effect.

Description

trigger switch

The invention relates to a trigger switch, in particular to a trigger switch of an electric tool.

Ordinary power tools use trigger switches and circuit design to start and shut down, and to control the speed and adjust the steering.

Referring to Fig. 1, a kind of existing trigger switch 1 comprises a housing base 11, a circuit board 12 located in the housing base 11, a Hall element 13 electrically connected to the circuit board 12, a hall element 13 which can be pressed and extended into The trigger 14 of the housing base 11 and a lever 15 that can be dialed and arranged on the housing base 11 .

The trigger 14 has a push shaft 141 that passes through the housing base 11, a conductive shrapnel 142 that is arranged on the rear end of the push shaft 141 and can be electrically connected with the circuit board 12, and a conductive shrapnel 142 that is arranged on the push shaft 141 The magnet 143 at the rear end. When the trigger 14 is pressed, the conductive shrapnel 142 conducts with the circuit board 12 to switch the power tool from the off state to the on state. And by continuing to press the trigger 14, the distance between the magnet 143 and the Hall element 13 is reduced to change the voltage, so as to adjust the rotation speed of the electric tool.

Turning the driving lever 15 to the left or to the right can drive the electric tool to rotate forward or reversely.

However, the size of the magnet 143 is small and its magnetic force is weak, and the magnetic induction between the Hall element 13 and the change is low, so that the voltage change is not significant, resulting in an insignificant change in the speed of the electric tool, and the use effect is not good. improve.

Therefore, the object of the present invention is to provide a trigger switch that improves the magnetic induction change and improves the use effect.

Therefore, the trigger switch of the present invention is suitable for being installed in an electric tool. The trigger switch includes a housing unit, a control unit, a trigger unit and a steering unit. The housing unit includes a chamber. The chamber has an opening extending along a front-rear direction, and a pivot slot extending along a vertical direction. The control unit is arranged in the chamber and includes a circuit board and a Hall element electrically connected to the circuit board. The trigger unit is operatively disposed on the housing unit and used to drive the electric tool to run. The trigger unit includes a sliding seat and a trigger group. The sliding seat is located in the chamber and can move relative to the circuit board along the front-rear direction and has a sliding seat body, a magnetic strip seat, a conductive elastic piece and a magnetic strip. The magnetic strip seat portion extends from the sliding seat body along the front-rear direction to a direction away from the Hall element. The magnetic strip seat portion has a mounting hole extending along the front-rear direction and opening forward. The conductive elastic piece is arranged on the top of the slider body and is used for electrical connection with the circuit board. The magnetic strip extends along the front-back direction and is arranged in the installation hole. The magnetic strip has two oppositely arranged magnetic poles in the front-rear direction. The trigger group can be pressed through the opening and used to drive the sliding seat to move. The steering unit is operatively disposed on the housing unit and used to change the rotation direction of the electric tool. The steering unit includes a steering piece that is pivotally disposed on the pivot slot, and a steering elastic piece that is disposed on the steering piece and can be elastically contacted with the circuit board.

The effect of the present invention is that: the magnetic strip seat portion of the trigger unit extends in the direction away from the Hall element along the front-rear direction, so that the magnetic strip with a larger size can be provided to increase the magnetic force of the magnetic strip, The use effect is improved by improving the magnetic induction change between the Hall element and the magnetic strip.

Referring to FIG. 2 , FIG. 3 and FIG. 4 , an embodiment of the trigger switch of the present invention is suitable for being installed in an electric tool (not shown). The electric tool can be a screwdriver, an electric drill or other tools with a rotating effect. The trigger switch includes a housing unit 2 , a control unit 3 , a trigger unit 4 and a steering unit 7 .

The housing unit 2 includes a first housing 22 and a second housing 23 that are aligned with each other along a left-right direction Y and cooperate to define a chamber 21 . The chamber 21 has a sliding space 211 and a turning space 212 arranged at intervals along a vertical direction Z. The sliding space 211 is located below the turning space 212 and has an opening 213 extending in the front-to-back direction X, and two slide grooves 214 opposite to each other along the left-right direction Y and extending in the front-to-back direction X. The opening 213 has a groove portion 215 all around. The sliding slots 214 are respectively formed on the first housing base 22 and the second housing base 23 . The steering space 212 has a pivot slot 216 extending along the vertical direction Z. The first shell seat 22 has a support platform 221 located in the chamber 21, two stoppers 222 spaced apart along the up-down direction Z and extending forward from the top and bottom of the opening 213, and a The abutting portion 223 is disposed in the chamber 21 and spaced apart from the opening 213 in the front-rear direction X. As shown in FIG. One of the limiting portions 222 is located above the other limiting portion 222 and has an accommodating groove 224 extending along the front-rear direction X and communicating with the sliding space 211 at the rear.

The control unit 3 is arranged in the chamber 21 and includes a circuit board 31 fixed on the bottom side of the supporting platform 221 and separating the sliding space 211 from the turning space 212, and a circuit board 31 electrically connected to the circuit board 31. Hall element 32 , and a cable 33 electrically connected to the circuit board 31 and passing through the housing unit 2 . The circuit board 31 is used to control the operation and rotation direction of the electric tool.

The trigger unit 4 is operatively disposed on the housing unit 2 and used to drive the electric tool to operate. The trigger unit 4 includes a sliding seat 5 and a trigger unit 6 .

The sliding base 5 is located in the sliding space 211 and can move relative to the circuit board 31 along the front-rear direction X and has a sliding base body 51 , a magnetic strip seat portion 52 , a conductive elastic piece 53 and a magnetic strip 54 .

The sliding seat body 51 is generally in an inverted U shape and has two sliding blocks 511 respectively formed on the left and right sides and slidably disposed in the sliding grooves 214 .

The magnetic strip seat portion 52 extends from the top of the sliding seat body 51 along the front-back direction X toward a direction away from the Hall element 32 and extends into the accommodating groove 224 of the first housing 22 . The magnetic strip seat portion 52 has a mounting hole 521 extending along the front-rear direction X and opening forward.

The conductive elastic piece 53 is disposed on the top of the slider body 51 and used for electrically connecting with the lower surface of the circuit board 31 .

The magnetic strip 54 extends along the front-back direction X and is disposed in the installation hole 521 . The magnetic strip 54 has two oppositely arranged magnetic poles 541 in the front-back direction X. As shown in FIG.

In this embodiment, the mounting hole 521 is circular, and the magnetic strip 54 is a cylinder. However, in other variations, the installation hole 521 may also be polygonal or irregular, and the shape of the magnetic strip 54 matches the installation hole 521 .

The trigger unit 6 can be pressed through the opening 213 and used to drive the sliding seat 5 to move. The trigger unit 6 has a trigger button 61 , a push rod 62 , an elastic member 63 and a washer 64 .

The trigger button 61 is used for pressing and has two guides 611 and a first connecting portion 612 . The guides 611 extend along the vertical direction Z at intervals and slide along the limiting portions 222 respectively. The first connecting portion 612 is tubular and has an inner peripheral surface 613 and an outer peripheral surface 614 arranged oppositely in the radial direction, and a plug hole 615 that is surrounded by the inner peripheral surface 613 and opens toward the housing unit 2 . , an annular groove 616 adjacent to the housing unit 2 and having a diameter larger than the plug hole 615 than the plug hole 615, and two radially opposite ones extending forward from the annular groove 616 and passing through the inner peripheral surface 613 and the The engaging groove 617 of the outer peripheral surface 614 . The inner peripheral surface 613 is concave-convex along the front-back direction X. As shown in FIG. The diameter of the plug hole 615 is tapered from an end adjacent to the base unit 2 to an end far away from the base unit 2 .

In this embodiment, the position-limiting parts 222 are two plates, and each guide piece 611 is a pair of grooves spaced apart in a left-right direction Y and extending along the front-rear direction X, which can improve the Stability and feel are better when the trigger button 61 is pressed. However, in other variations, each of the guide members 611 can also be two support plates (not shown) that are spaced up and down and are respectively supported by the position-limiting parts 222 , which can also achieve the guiding function. It should be noted that, in other variations, there may be only one guide member 611 and one limiting portion 222 . Alternatively, directly omitting the guides 611 and the limiting parts 222 also does not affect the movement of the sliding seat 5 driven by the trigger unit 6 .

The push rod 62 has a shaft 621 passing through the opening 213 along the front-rear direction X and connected to the sliding base 5 , and a shaft 621 formed on the shaft 621 and detachably connected to the first connecting portion 612 The second connection part 622. The shaft 621 has a slot 623 for inserting the sliding seat body 51 , and an annular hole 624 opening toward the abutting portion 223 . The second connecting portion 622 extends forward from the shaft 621 and fits the plug hole 615 into the plug hole 615 . The second connecting portion 622 has a positioning ring 625 protruding radially outward from the outer surface and used to be locked in the ring groove 616, and two positioning rings 625 extending forward along the front-rear direction X and respectively The locking blocks 626 are used to be locked in the locking slots 617 .

In this embodiment, there are two locking slots 617 of the first connecting portion 612 and two locking blocks 626 of the second connecting portion 622 , but in other variations, the locking slots 617 of the first connecting portion 612 and the There can also be only one locking block 626 of the second connecting portion 622, which can also achieve the effect of increasing positioning. It should be noted that the positioning effect can be achieved by inserting the second connecting portion 622 into the plug hole 615 of the first connecting portion 612. Therefore, in other variation examples, the annular groove 616 and the positioning can also be omitted. The ring 625, the slots 617 and the blocks 626.

In this embodiment, the trigger button 61 and the push rod 62 are detachably assembled together by the first connecting part 612 and the second connecting part 622 respectively, so that the user can replace the trigger button 61 according to requirements, and can Increase usage variability. And because it is not necessary to replace the trigger button 61 and the push rod 62 at the same time, the use cost can also be reduced. In addition, the first connecting portion 612 and the second connecting portion 622 may also be screwed to each other by a screw hole (not shown) and a screw (not shown), or the first connecting portion 612 and the second connecting portion 622 One-piece forming is not limited thereto.

In this embodiment, the elastic member 63 is a compression spring. One end of the elastic member 63 is accommodated in the annular hole 624 of the pushing shaft and the other end is pushed against the abutting portion 223 of the first casing 22 . When the trigger button 61 is pressed to drive the sliding seat 5 to move toward the abutting portion 223 , the elastic member 63 is compressed and accumulates a constant potential energy to reset the trigger unit 6 outward.

The washer 64 is embedded in the groove portion 215 of the opening 213 and is slidably contacted by the push rod 62 . The gasket 64 has a dust-proof function to prevent dust and foreign matter from entering the opening 213 . Furthermore, the design of inserting the washer 64 into the opening 213 can reduce the resistance when the trigger unit 6 is actuated, so that the trigger unit 6 can be easily pressed to improve the operating feel.

Referring to FIG. 3 , FIG. 4 and FIG. 5 , the steering unit 7 is operatively disposed in the steering space 212 of the housing unit 2 and used to change the rotation direction of the power tool. The steering unit 7 includes a steering member 71 , a positioning rod 72 , a steering elastic piece 73 , a positioning elastic piece 74 and a washer 75 .

Referring to Fig. 5 to Fig. 9, the steering member 71 has a pivot 711 pivotally arranged in the pivot groove 216, a toggle end 712 and a steering end 713 arranged in opposite directions, and a steering end 713 and the pivot The positioning part 714 between the shafts 711. The positioning portion 714 has a through slot 715 extending along the vertical direction Z. The slot 715 has a positioning section 716 with a circular cross section, and an open section 717 with an arc-shaped cross section facing the positioning slots 741 and connected to the positioning section 716 below.

The positioning rod 72 is made of metal and detachably passes through the positioning section 716 and the opening section 717 along the up-down direction Z, and a part is exposed from the opening section 717 .

The turning elastic piece 73 is disposed on the bottom side of the turning end 713 and can be elastically contacted with the upper surface of the circuit board 31 .

The positioning elastic piece 74 is fixed on the top side of the supporting platform 221 . And there are several positioning slots 741 arranged at intervals and opening toward the positioning portion 714 . The positioning rod 72 is selectively snapped into one of the positioning slots 741 so that the steering member 71 is positioned.

In this embodiment, the positioning rod 72 is made of metal, which is relatively wear-resistant and can increase the service life, and the positioning rod 72 is detachably installed, and only the positioning rod 72 needs to be replaced after wear, and the use cost is low. However, in other variations, the positioning rod 72 can also be integrally formed with the steering member 71 .

The washer 75 is sheathed on the pivot 711 and accommodated in the pivot groove 216 , so as to prevent dust.

In this embodiment, the number of the positioning slots 741 is three. As shown in FIG. 5 and FIG. 8 , when the positioning rod 72 is inserted into the positioning groove 741 in the middle, the power tool is in a non-rotating state. As shown in FIG. 6 , when the toggle end 712 of the steering member 71 is turned to the left, the positioning rod 72 snaps into the positioning slot 741 on the right, and the trigger button 61 is pressed to make the power tool in a state of forward rotation. As shown in Figure 7 and Figure 10, when the toggle end 712 of the steering member 71 is turned to the right, the positioning rod 72 is snapped into the positioning groove 741 on the left, and the trigger button 61 is pressed to make the electric tool in reverse action status.

When the trigger button 61 is pressed, the conductive shrapnel 53 will conduct with the circuit board 31, so that the circuit board 31 outputs a switch signal to start the electric tool.

One of the magnetic poles 541 of the magnetic strip 54 is far away from the trigger button 61 in the front-back direction X, and the other magnetic pole 541 of the magnetic strip 54 is adjacent to the trigger button 61 in the front-back direction X. By gradually pressing the trigger button 61 inwards, the distance between one of the magnetic poles 541 and the Hall element 32 can be increased, so that the magnetic induction between the Hall element 32 and the magnetic strip 54 changes to change the voltage, And make the circuit board 31 output change signal to adjust the rotation speed of the electric tool.

Due to the magnetic induction between the Hall element 32 and the magnetic strip 54 , the voltage is proportional to the rotation speed of the electric tool. With the magnetic strip seat portion 52 extending outward along the front-rear direction X, the magnetic strip 54 with a larger size and longer length can be provided to improve the magnetic force of the Hall element 32 and the distance between the Hall element 32 and the magnetic strip 54. The magnetic induction changes, thereby increasing the speed change of the electric tool, which can improve the use effect during operation.

In the present invention, the magnetic strip seat portion 52 of the trigger unit 4 extends along the front-rear direction X toward a direction away from the Hall element 32 , so that the magnetic strip 54 with a larger size can be provided to increase the magnetic strip 54 The magnetic force increases the magnetic induction between the Hall element 32 and the magnetic strip 54 to enhance the use effect. Therefore, the object of the present invention can indeed be achieved.

But what is described above is only an embodiment of the present invention, and should not limit the scope of the present invention. All simple equivalent changes and modifications made according to the patent scope of the present invention and the content of the patent specification are still within the scope of the present invention. Within the scope covered by the patent of the present invention.

2: shell seat unit 21: Containment room 211: Sliding space 212: turn to space 213: opening 214: Chute 215: groove part 216: pivot slot 22: First shell seat 221: support table 222: limit part 223: abutting part 224: storage tank 23: Second shell seat 3: Control unit 31: circuit board 32: Hall element 33: Cable 4: Trigger unit 5: sliding seat 51: Slider body 511: slider 52:Magnetic strip seat 521: Mounting hole 53: Conductive shrapnel 54:Magnetic stripe 541: Magnetic pole 6: Trigger group 61: Trigger button 611: guide 612: The first connecting part 613: inner peripheral surface 614: Outer peripheral surface 615: plug hole 616: ring groove 617: card slot 62: push rod 621: Shaft 622: the second connecting part 623: Embedding 624: ring hole 625: positioning ring 626: block 63: Elastic parts 64: Gasket 7: Steering unit 71: Steering piece 711:pivot 712: Toggle end 713: Steering end 714: Positioning department 715: slotting 716: positioning segment 717: open segment 72: positioning rod 73: turn to shrapnel 74: positioning shrapnel 741: positioning slot 75: Gasket X: Front and rear direction Y: left and right directions Z: up and down direction

Other features and effects of the present invention will be clearly presented in the implementation manner with reference to the drawings, wherein: Figure 1 is a sectional view illustrating a conventional trigger switch; 2 is a fragmentary perspective view illustrating an embodiment of the trigger switch of the present invention, and a second housing of a housing unit of the embodiment is removed; Fig. 3 is an incomplete three-dimensional exploded view of this embodiment; Fig. 4 is an incomplete sectional combined view of this embodiment; Fig. 5 is a schematic plan view illustrating the cooperation relationship between a steering member, a positioning rod and a positioning elastic piece of a steering unit in this embodiment; Fig. 6 is a view similar to Fig. 5, illustrating that the steering member is turned left and the positioning rod is snapped into a positioning slot on the right side of the positioning shrapnel, and a trigger button of a trigger unit of this embodiment is pressed; Fig. 7 is a view similar to Fig. 5, illustrating that the steering member is turned right and the positioning rod is snapped into another positioning slot on the left side of the positioning shrapnel, and the trigger button is pressed; Figure 8 is a sectional view taken along line VIII-VIII in Figure 5; and Fig. 9 is a sectional view taken along line IX-IX in Fig. 7 .

2: shell seat unit

21: Containment room

211: Sliding space

212: turn to space

213: opening

214: Chute

215: groove part

216: pivot slot

22: First shell seat

221: support platform

222: limit part

223: abutting part

23: Second shell seat

3: Control unit

31: circuit board

32: Hall element

33: Cable

4: Trigger unit

5: sliding seat

51: Slider body

511: slider

52:Magnetic strip seat

521: Mounting hole

53: Conductive shrapnel

54:Magnetic stripe

6: Trigger group

61: Trigger button

611: guide

612: The first connecting part

615: plug hole

617: card slot

62: push rod

621: Shaft

622: the second connecting part

624: ring hole

625: positioning ring

626: block

63: Elastic parts

64: Gasket

7: Steering unit

71: Steering piece

711:pivot

712: Toggle end

713: Steering end

714: Positioning Department

72: positioning rod

73: turn to shrapnel

74: positioning shrapnel

75: Gasket

X: Front and rear direction

Y: left and right direction

Z: up and down direction

Claims (10)

A trigger switch suitable for installation in an electric tool, the trigger switch comprising: A housing unit, comprising a chamber, the chamber has an opening extending along a front-rear direction, and a pivot groove extending along a vertical direction; A control unit is arranged in the chamber and includes a circuit board, and a Hall element electrically connected to the circuit board; A trigger unit, which can be operatively arranged on the housing unit and used to drive the operation of the electric tool, the trigger unit includes a sliding seat and a trigger group, the sliding seat is located in the chamber and can move along the front and rear The direction moves relative to the circuit board and has a slider body, a magnetic strip seat part, a conductive shrapnel and a magnetic strip. direction, the magnetic strip seat part has a mounting hole extending along the front and rear direction and opening forward, the conductive shrapnel is arranged on the top of the slider body and used to electrically connect with the circuit board, the magnetic strip is along the front and rear extending in the direction and arranged in the mounting hole, the magnetic strip has two oppositely arranged magnetic poles in the front-rear direction, the trigger group can be pressed through the opening and used to drive the sliding seat to move; and A steering unit, which can be operatively arranged on the housing unit and used to change the rotation direction of the electric tool, the steering unit includes a steering member pivotably arranged in the pivot groove, and a steering member arranged in the steering member And can be elastically contacted with the turning shrapnel of the circuit board. The trigger switch according to claim 1, wherein the housing unit has an abutting portion located in the chamber and spaced apart from the opening in the front-rear direction, the trigger group has a trigger button for pressing, A push rod extending backward from the trigger button along the front-rear direction and passing through the opening and connected to the sliding seat, and an elastic member that can be compressed between the push rod and the abutting portion . The trigger switch according to claim 2, wherein, the housing unit further has at least one limit portion extending forward along the front-rear direction, and the trigger button has at least one limit portion extending along the front-rear direction and capable of moving along the at least one limit portion. Guide for bit slippage. The trigger switch according to claim 3, wherein, the limiting part is two plates arranged at intervals along the up-down direction and respectively extending forward from the top and bottom of the opening along the front-back direction, and the guide It is a pair of grooves facing each other at intervals in a left-right direction and extending along the front-rear direction. The trigger switch according to claim 2, wherein the trigger button has a first connecting portion, the push rod has a shaft passing through the opening along the front-rear direction, and a detachable shaft formed on the shaft The ground is connected to the second connection part of the first connection part. The trigger switch according to claim 5, wherein the first connecting part is tubular and has an inner peripheral surface and an outer peripheral surface arranged in opposite directions in the radial direction, and an opening is defined by the inner peripheral surface toward The plug hole of the housing unit, the inner peripheral surface undulates along the front-rear direction, the aperture of the plug hole is tapered from one end adjacent to the housing unit to an end farther away from the housing unit, the second connecting portion The shape fits the plug hole and is used to plug into the plug hole. The trigger switch according to claim 6, wherein the first connecting part further has an annular groove adjacent to the housing unit and having a diameter larger than the plug hole than the plug hole, and at least one The direction extends away from the housing unit and passes through the locking groove of the inner peripheral surface and the outer peripheral surface, and the second connecting part has a positioning ring protruding radially outward and used to be locked in the ring groove , and at least one clamping block extending from the positioning ring along the front-rear direction toward a direction away from the housing unit and used for clamping in the at least one clamping groove. The trigger switch according to claim 1, wherein the steering member has a pivot shaft pivoted in the pivot slot, a steering end for the steering elastic piece, and a location between the steering end and the pivot shaft. part, the steering unit also includes a positioning rod installed on the positioning part and made of metal, and a positioning elastic piece located in the container, the positioning elastic piece has several positioning grooves arranged at intervals, and the positioning rod selectively Snap into one of the positioning slots. The trigger switch according to claim 8, wherein, the positioning part has a slot extending along the up-down direction, the slot has a positioning segment with a circular cross section, and an arc-shaped cross section facing the The positioning rod is detachably threaded through the positioning segment and the opening segment along the up and down direction, and a part is exposed to the opening segment. The trigger switch as claimed in claim 1, wherein the housing unit has a receiving groove extending forward along the front-rear direction and into which the magnetic strip seat part extends.

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