TWI726751B - Trigger switch - Google Patents

Abstract

A trigger switch includes a housing unit, a control unit and a steering unit. The shell seat unit includes a first shell seat and a second shell seat that are aligned with each other, and the first shell seat and the second shell seat cooperate to define a pivot groove. The control unit includes a circuit board, a conductive sliding seat group, a trigger unit and a magnetic induction group. The conductive sliding seat group can move relative to the circuit board and has a plurality of conductive elastic sheets for electrical connection with the circuit board. The trigger unit is used to drive the conductive sliding seat group to move. The magnetic induction group has a Hall element and a magnetic part that moves with the conductive sliding seat group. The steering unit includes a shift lever pivotally arranged in the pivot slot, and the shift lever is integrally formed and has a pivot shaft pivoted in the pivot slot and a steering elastic piece that can be elastically contacted with the circuit board.

Description

Trigger switch

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

General electric tools will use trigger switches and circuit design to turn on and off, and to control the speed and adjust the steering.

As shown in Figures 1 and 2, a conventional trigger switch 1 includes a housing 11, a depressible trigger 12, a push shaft 13 connected to the trigger 12 and passing through the housing 11, and a The circuit board 14 in the housing 11 and a steering device 15 rotatably arranged on the housing 11. One end of the push shaft 13 adjacent to the circuit board 14 is provided with a conductive spring (not shown) that can be electrically connected to the circuit board 14. By pressing or releasing the trigger 12, the push shaft 13 and the circuit board 14 are changed. The relative position of the power tool can generate different electronic signals such as power-on, power-off, and resistance change, so as to control the operation of the power tool.

The steering device 15 is used to change the direction of rotation of the electric tool. The steering device 15 has a driving arm 151 and a rotating arm 152. The driving arm 151 is used to drive a conductive spring (not shown) to rotate relative to the circuit board 14. , To produce forward or reverse electricity According to the sub signal, the rotating arm 152 is screwed to the driving arm 151 with a screw 153. The user can change the rotating direction of the electric tool by turning the rotating arm 152 to the left or right.

Although the trigger switch 1 has the above-mentioned characteristics of use, the screw 153 may loosen after the steering device 15 is turned repeatedly for a period of time, which may cause the coupling of the driving arm 151 and the rotating arm 152 to be unstable. The torque cannot be transmitted smoothly, and therefore, the durability is poor.

Therefore, the purpose of the present invention is to provide a trigger switch with higher durability.

Therefore, the trigger switch of the present invention is suitable for installation in an electric tool, and the trigger switch includes a housing unit, a control unit and a steering unit.

The housing unit includes a first housing and a second housing that are aligned with each other. The first housing and the second housing cooperate to define an accommodating space, and an accommodating space connected to the accommodating space and extending along A sliding hole extending in a front-to-rear direction and a pivot groove extending in a top-bottom direction and along the front-to-rear direction. The housing unit has a mounting portion located in the accommodating space and opposite to the sliding hole at intervals.

The control unit is operatively arranged on the housing unit, and the control unit includes a circuit board, a conductive sliding seat group, a trigger unit and a magnetic induction group.

The circuit board is arranged in the accommodating space, and the circuit board has a plurality of The metal belt on the upper surface and used to control the rotation direction of the electric tool, and several conductive belts located on the lower surface and used to control the operation of the electric tool. The conductive sliding seat set is located in the accommodating space and can move relative to the circuit board along the front-rear direction. The conductive sliding seat set has a plurality of conductive elastic sheets for electrically connecting with the conductive strips. The trigger set can be pressed and arranged on the housing unit and used to drive the conductive slide set to move. The trigger set has a push shaft that penetrates the sliding hole and is connected to the conductive slide set, and a push shaft that can be moved A reset elastic member compressed and arranged between the pushing shaft and the mounting part. The magnetic induction group has a Hall element electrically connected to the circuit board, and a magnetic element arranged opposite to the Hall element and moving with the conductive sliding seat group.

The steering unit is operably disposed on the housing unit, and the steering unit includes a shift lever that is pivotally disposed on the pivot slot, and a shift lever disposed on the shift lever and can be elastically contacted with the circuit board The turning elastic piece of the metal belt, the shift lever is integrally formed and has a pivot pivoted in the pivot groove.

The effect of the present invention is that the present invention is pivotally arranged in the pivot slot through the pivot, when the shift lever is assembled to the housing unit, no screw connection is required, and the shift lever is used as an integral design It can improve the structural strength and prolong the service life. Therefore, the durability of the present invention is relatively high.

2: Housing unit

200: accommodating space

20: pivot slot

201: Sliding hole

203: Glue room

204: Groove

205: Pivot section

206: Dust section

207: hollow section

21: The first shell seat

211: Support Table

212: Chute

213: Installation Department

214: Abutment Block

22: The second shell seat

221: Chute

3: control unit

31: circuit board

311: Metal Belt

312: Conductive tape

32: cable

33: Conductive sliding seat group

34: Trigger unit

341: Trigger

342: Push Axis

343: reset elastic

344: Dust Ring

345: Insert slot

346: Annular Groove

347: Convex Rib

35: sliding seat

350: Groove

351: installation slot

352: Slider

353: axis channel

354: Moulding

355: groove bottom

356: upper opening

357: front opening

36: conductive shrapnel

361: Conduction section

362: connection segment

363: Inner hook section

37: Magnetic induction group

371: Hall element

372: Magnetic Parts

4: Steering unit

41: lever

410: positioning bump

411: Pivot

412: Toggle End

413: steering end

415: Top shaft section

416: bottom shaft section

418: Push to the convex part

42: steering shrapnel

43: Dust gasket

44: positioning shrapnel

441: Concave

X: left and right direction

Y: front and rear direction

Z: Top and bottom direction

The other features and effects of the present invention will be described with reference to the drawings. Figure 1 is a perspective view of an existing trigger switch; Figure 2 is an incomplete three-dimensional exploded view of the existing trigger switch; Figure 3 is an embodiment of the trigger switch of the present invention Fig. 4 is an incomplete three-dimensional exploded view of this embodiment; Fig. 5 is an incomplete cross-sectional side view of the embodiment; Fig. 6A is a partial exploded perspective view illustrating the embodiment A steering unit is installed in a housing unit; Figure 6B is a perspective view illustrating a control unit of this embodiment; Figure 7 is an incomplete perspective view from the bottom side to the top side, illustrating a perspective view of the control unit Magnetic induction group; Figure 8 is a schematic top view illustrating the cooperation between a lever of the steering unit and a positioning spring; Figure 9 is a view similar to Figure 8, illustrating that the lever is turned to the left and a push 10 is a view similar to Fig. 9, illustrating that the lever is turned to the right and the pushing convex portion is locked into a concave portion on the left side of the positioning spring; Figure 11 Is a schematic diagram of the upper surface of a circuit board of the control unit and a steering elastic piece of the steering unit; FIG. 12 is a diagram of the lower surface of the circuit board and two conductive elastic pieces of a conductive sliding seat group A schematic diagram; FIG. 13 is a view similar to FIG. 12, illustrating that the conductive spring pieces move and turn on the switch signal of the circuit board; and FIG. 14 is a view similar to FIG. 11, illustrating the turning spring edge The circuit board rotates.

3 and 4, the embodiment of the trigger switch of the present invention is suitable for installation in an electric tool (not shown). The electric tool can be a screwdriver, an electric drill or other tools with rotating function. The trigger switch is used to control the startup and shutdown of the electric tool, and is used to adjust the rotation speed and steering. The trigger switch includes a housing unit 2, a control unit 3 and a steering unit 4.

4-6, the housing unit 2 includes a first housing 21 and a second housing 22 that are mutually aligned along a left-to-right direction X, and the first housing 21 and the second housing 22 are opposite to each other. Cooperating to define an accommodating space 200, a sliding hole 201 connected to the accommodating space 200 and extending along a front-to-rear direction Y, and a sliding hole 201 that is higher than the sliding hole 201 in a top-bottom direction Z and communicates with the accommodating space The pivot groove 20 of 200 and a glue-filling chamber 203 communicating with the accommodating space 200 and the outside. The sliding hole 201 has a groove portion 204 surrounding the entire circumference. The pivot slot 20 extends along the top and bottom direction Z and along the front and rear direction Y. The top and bottom ends are closed. The pivot slot 20 has a pivot section 205 that is higher than the pivot section 205. And a dust-proof section 206 with an inner diameter greater than the inner diameter of the pivot section 205 and a hollow section 207 that is higher than the dust-proof section 206.

In this embodiment, the first housing 21 has a supporting stand 211 located in the accommodating space 200, a sliding groove 212 extending along the front-rear direction Y, and an installation adjacent to the rear end of the sliding groove 212 The supporting platform 211 is higher than the sliding groove 212 and the mounting portion 213 and has a resisting block 214. The mounting portion 213 and the sliding hole 201 are spaced and opposed to each other in the front-rear direction Y. Preferably, the mounting portion 213 is a groove. More preferably, the glue pouring chamber 203 is formed on the first housing 21, and the glue pouring chamber 203 is located below the mounting portion 213. The second housing base 22 has a sliding groove 221 disposed opposite to the sliding groove 212 of the first housing base 21 in the left-right direction X.

The control unit 3 is operatively disposed on the housing unit 2 and used to control the operation of the electric tool. The control unit 3 includes a circuit board 31, a cable 32, a conductive sliding seat group 33, a trigger unit 34 and a magnetic induction group 37. The circuit board 31 is arranged in the accommodating space 200 and fixed to the bottom side of the supporting table 211, and the circuit board 31 is used to control the operation and rotation direction of the electric tool. The cable 32 is connected to the circuit board 31 and passes through the glue chamber 203 and out of the housing unit 2. By filling the glue chamber 203 with glue, the cable 32 can be positioned and avoid The flat cable 32 is pulled off or broken by external force.

Referring to FIGS. 5 to 7, the conductive sliding seat set 33 is slidably disposed in the accommodating space 200 and can move relative to the circuit board 31 along the front and rear direction Y. The conductive sliding The seat set 33 has a sliding seat 35 and two conductive elastic pieces 36 that can be elastically disposed on the sliding seat 35 and used to contact the lower surface of the circuit board 31. The conductive elastic pieces 36 follow the sliding seat 35 mobile. The sliding seat 35 has a groove 350 that is open front and back and the top side is open, two installation grooves 351 adjacent to the groove 350 and located at the top for the conductive elastic pieces 36 are respectively formed, and two are respectively formed on the left and the right. Sliders 352 slidably disposed on both sides of the sliding grooves 212, 221 (see FIG. 4), a shaft passage 353 that penetrates the front and back and is located between the slides 352, and a passage 353 surrounding the shaft The molding 354. Each of the installation grooves 351 has a groove bottom surface 355, an upper opening 356 spaced and opposite to the respective groove bottom surface 355, and a front opening 357 connected to the upper opening 356. Each conductive elastic piece 36 has a conductive section 361 for abutting against the lower surface of the circuit board 31, two connecting sections 362 located on opposite sides of the conductive section 361, and two connecting sections respectively connected to the connections The inner hook section 363 of the section 362, the conducting section 361 is located above the respective upper opening 356. The inner hook sections 363 extend opposite to each other and are accommodated in the respective installation grooves 351. One of the inner hook sections 363 is lower than the other inner hook section 363 and abuts the corresponding groove bottom surface 355. Preferably, The conductive elastic pieces 36 are integrally connected and communicate with each other. By the inner hook segments 363 of each conductive elastic piece 36 being accommodated in the respective mounting groove 351, and one of the inner hook segments 363 abuts against the corresponding groove bottom surface 355, each conductive elastic piece can be improved The stability of the contact between 36 and the circuit board 31 is to avoid the problem of signal interruption caused by vibration of the electric tool under high-speed rotation.

The trigger unit 34 can be pressed to the housing unit 2 and used to drive The conductive slide set 33 moves. The trigger set 34 has a trigger 341 for pressing, a push shaft 342 connecting the trigger 341 and the conductive slide set 33, and a compressible set between the push shaft 342 and the push shaft 342. The reset elastic member 343 between the mounting parts 213 and a dust-proof ring 344 are provided. Preferably, the trigger 341 and the pushing shaft 342 are integrally formed, and the pushing shaft 342 is slidably inserted through the sliding hole 201.

4, 5 and 7, more preferably, the outer peripheral surface of the pushing shaft 342 is formed with a semicircular arc-shaped embedding groove 345, and the embedding groove 345 is provided at an end opposite to the trigger 341 and provides The molding 354 of the sliding seat 35 is embedded, so that the sliding seat 35 can be firmly assembled on the pushing shaft 342. The reset elastic member 343 is a compression spring. Preferably, the pushing shaft 342 has a concave annular groove 346 formed on the end surface of the mounting portion 213, and one end of the reset elastic member 343 is accommodated in the annular groove. 346 and the other end is pushed against the mounting portion 213. When the trigger 341 is pressed to link the pushing shaft 342 to drive the conductive slide assembly 33 to move in the direction of the mounting portion 213, the reset elastic member 343 is squeezed and A constant potential energy to reset the pushing shaft 342 is generated. The dust-proof ring 344 is inserted into the groove portion 204 of the sliding hole 201 and is positioned in the sliding hole 201. The dust-proof ring 344 is slidably contacted by the pushing shaft 342. The dust-proof ring 344 has the function of preventing dust and foreign objects from entering the sliding hole 201. The dustproof function of the sliding hole 201, and the design of the dustproof ring 344 built into the sliding hole 201 can reduce the resistance when the trigger unit 34 is actuated, so that the user can easily press. Therefore, the operation of this embodiment Feel better.

The magnetic induction group 37 has a Hall element electrically connected to the circuit board 31 A piece 371, and a magnetic piece 372 disposed opposite to the Hall element 371 and moving along with the conductive sliding seat set 33. In this embodiment, the magnetic element 372 is disposed in the groove 350 of the sliding seat 35, and the Hall element 371 is connected to the lower surface of the circuit board 31 and faces the magnetic element 372. However, in other variations, the Hall element 371 and the magnetic element 372 can also be arranged in other positions, as long as the magnetic element 372 can move relative to the Hall element 371.

Referring to FIGS. 3 to 5, the steering unit 4 is operatively disposed on the housing unit 2, and the steering unit 4 includes a shift lever 41, a steering elastic piece 42, a dust-proof washer 43 and a positioning elastic piece 44. The shift lever 41 is pivotally disposed in the pivot slot 20, the shift lever 41 has a pivot shaft 411 pivoted in the pivot slot 20, a shift end 412 and a steering end 413 arranged in opposite directions, and a The positioning protrusion 410 is located between the turning end 413 and the pivot 411. The pivot 411 is integrally formed and has a top shaft section 415 and a bottom shaft section 416, the top shaft section 415 is located in the hollow section 207, and the shift lever 41 is integrally formed, which has better structural strength. The toggle end 412 is used for the user to toggle so that the toggle lever 41 can rotate relative to the pivot slot 20 with the pivot shaft 411 as the center.

The turning elastic piece 42 is arranged on the bottom side of the turning end 413 of the shift lever 41 and can be elastically contacted with the upper surface of the circuit board 31. The turning elastic piece 42 is formed with two contacts for electrically connecting with the circuit board 31. Point to control the direction of rotation of the power tool. The dust-proof washer 43 is sleeved on the pivot shaft 411 and is accommodated in the dust-proof section 206 of the pivot groove 20, thereby having a dust-proof effect. It should be noted that the dust-proof washer 43 can be flexible due to its elasticity. Stretching, thereby, the dust-proof washer 43 is inserted into the dial end 412 of the shift lever 41 and moved toward the pivot 411 to achieve positioning. The positioning elastic piece 44 is disposed on the supporting platform 211 and located between the abutting block 214 and the positioning protrusion 410.

In the present invention, the pivot shaft 411 is pivotally arranged in the pivot groove 20, and the shift lever 41 is assembled on the housing base by the first housing base 21 and the second housing base 22 being aligned with each other. Unit 2, therefore, does not need to be screwed. At the same time, the use of the lever 41 as an integral design can improve the structural strength and prolong the service life. Therefore, the durability of the present invention is relatively high.

It should be particularly noted that, in this embodiment, the dust-proof ring 344 and the dust-proof washer 43 are respectively arranged at the two operating positions of the trigger unit 34 and the shift lever 41 to improve the airtightness of this embodiment. Better dustproof effect.

5, 6 and 8, the positioning spring 44 has a plurality of recesses 441 spaced apart, the positioning protrusion 410 has a pushing protrusion 418 facing the turning end 413, the pushing protrusion 418 is selectively It snaps into one of the recesses 441 so that the shift lever 41 is positioned. The positioning protrusion 410 and the positioning elastic piece 44 have a simple structure and convenient assembly, therefore, the manufacturing cost is low.

Referring to FIGS. 8 to 10, in this embodiment, the number of the recesses 441 is three. As shown in FIG. 8, when the positioning protrusion 410 is locked into the concave portion 441 in the middle, a rib 347 of the trigger 341 pushes against the toggle end 412 of the lever 41 and cannot be pressed, so that the electric tool In a state of no rotation. As shown in Figure 9, turn the lever 41 to the left When the end 412 is toggled, the positioning protrusion 410 snaps into the concave portion 441 on the right, the trigger 341 and the lever 41 can be pressed without obstacles, and the electric tool is in a forward rotation state. As shown in FIG. 10, when the toggle end 412 of the shift lever 41 is turned to the right, the positioning protrusion 410 snaps into the concave portion 441 on the left, and there is no obstacle between the trigger 341 and the shift lever 41 and can be pressed. , And make the electric tool in the state of reversing operation.

5, 11 and 12, the upper surface of the circuit board 31 is formed with three metal strips 311, the lower surface of the circuit board 31 is formed with two conductive strips 312, the metal strips 311 are used for the turning spring 42 can be slidably contacted to control the direction of rotation of the power tool. The conductive belts 312 are used for the conductive elastic pieces 36 to be slidably contacted, and can control the power-on and power-off of the electric tool.

Referring to FIGS. 5 and 12, when the trigger 341 is not pressed, the two conductive strips 312 are not turned on. At this time, the switch signal of the circuit board 31 is not turned on and output.

Referring to FIGS. 5 and 13, when the trigger 341 is pressed, the conductive springs 36 will contact the conductive strips 312 to make Pin1 and Pin2 conduct each other, and the circuit board 31 will output a switch signal.

In the present invention, by gradually pressing the trigger 341, the distance between the magnetic element 372 and the Hall element 371 can be reduced to change the resistance, and the circuit board 31 can output a change signal, thereby adjusting the rotation speed of the electric tool.

9 and 11, if you want to adjust the direction of rotation of the power tool, turn the shift lever 41 to the left, the shift lever 41 will drive the steering spring 42 to turn right, and make Pin3 Connected to Pin5, at this time, the electric tool is in a forward rotation state.

10 and 14, on the contrary, if the shift lever 41 is rotated to the right, the shift lever 41 will drive the steering elastic piece 42 to turn left, so that Pin7 and Pin5 are connected. At this time, the electric tool is in a state of reversing operation.

In summary, in the trigger switch of the present invention, by pivoting the pivot 411 in the pivot slot 20, the shift lever 41 can be assembled to the housing unit 2 without screwing. Therefore, the durability of the present invention is Higher. At the same time, the use of the lever 41 as an integral design can improve the structural strength and prolong the service life, so it can indeed achieve the purpose of the invention.

However, the above are only examples of the present invention. When the scope of implementation of the present invention cannot be limited by this, all simple equivalent changes and modifications made in accordance with the scope of the patent application of the present invention and the content of the patent specification still belong to Within the scope covered by the patent of the present invention.

2: Housing unit

20: pivot slot

201: Sliding hole

203: Glue room

204: Groove

21: The first shell seat

211: Support Table

212: Chute

213: Installation Department

214: Abutment Block

22: The second shell seat

221: Chute

3: control unit

31: circuit board

32: cable

33: Conductive sliding seat group

34: Trigger unit

341: Trigger

342: Push Axis

343: reset elastic

344: Dust Ring

345: Insert slot

35: sliding seat

350: Groove

351: installation slot

352: Slider

353: axis channel

354: molding

356: upper opening

357: front opening

36: conductive shrapnel

37: Magnetic induction group

371: Hall element

372: Magnetic Parts

4: Steering unit

41: lever

410: positioning bump

411: Pivot

412: Toggle End

413: steering end

415: Top shaft section

416: bottom shaft section

42: steering shrapnel

43: Dust gasket

44: positioning shrapnel

X: left and right direction

Y: front and rear direction

Z: Top and bottom direction

Claims (10)

A trigger switch is suitable for being installed in an electric tool. The trigger switch comprises: a housing base unit, including a first housing base and a second housing base that are aligned with each other, the first housing base and the second housing base Cooperating to define an accommodating space, a sliding hole connected to the accommodating space and extending in a front-to-rear direction, and a pivot groove extending in a top-bottom direction and in the front-to-rear direction, the housing unit has a A mounting part located in the accommodating space and spaced apart from the sliding hole; a control unit operably disposed on the housing unit, the control unit includes: a circuit board disposed in the accommodating space, the circuit The plate has several metal belts on the upper surface and used to control the rotation direction of the electric tool, and several conductive belts on the lower surface and used to control the operation of the electric tool. A conductive slide set is located in the accommodating In the space and movable relative to the circuit board in the forward and backward directions, the conductive slide set has a plurality of conductive springs for electrically connecting with the conductive strips, and a trigger unit can be pressed and arranged on the housing unit and used To drive the conductive slide set to move, the trigger set has a push shaft that penetrates the sliding hole and is connected to the conductive slide set, and a reset that can be compressed and arranged between the push shaft and the mounting part The elastic member and a magnetic induction group have a Hall element electrically connected to the circuit board, and a Hall element arranged opposite to the Hall element and following the conductive sliding seat Group of movable magnetic parts; and a steering unit operably disposed on the housing unit, the steering unit includes a shift lever that is pivotally disposed in the pivot groove, and a shift lever that is disposed on the shift lever and can be squeezed The turning elastic pieces of the metal belts that ground contact the circuit board, the shift lever is integrally formed and has a pivot pivoted in the pivot groove. The trigger switch according to claim 1, wherein the conductive sliding seat set further has a sliding seat connected to the pushing shaft, the conductive elastic pieces can be elastically arranged on the sliding seat, and the magnetic member is arranged on the sliding seat. Seat, the Hall element is connected to the lower surface of the circuit board and faces the magnetic component. The trigger switch according to claim 1, wherein the shift lever further has a steering end for the steering shrapnel, and a positioning protrusion located between the steering end and the pivot, and the steering unit further includes a The positioning elastic piece has a plurality of recesses arranged at intervals, and the positioning protrusion is selectively inserted into one of the recesses. The trigger switch according to claim 1, wherein the pivot groove has a dust-proof section, and the steering unit further includes a set of dust-proof washers arranged on the pivot and accommodated in the dust-proof section. The trigger switch according to claim 1, wherein the trigger unit further has a dustproof ring inserted into the sliding hole and slidably contacted by the pushing shaft. The trigger switch according to claim 1, wherein the housing unit also surrounds and defines a glue-filling chamber connected to the accommodating space, and the control unit further includes a glue-filling chamber connected to the circuit board and passing through the glue-filling chamber. Passing through the cable of the housing unit, the glue-pouring chamber is used to fill the glue to position the cable. The trigger switch according to claim 1, wherein the conductive slide set also has A sliding seat connected to the pushing shaft, the conductive elastic pieces can be elastically arranged on the sliding seat and move with the sliding seat, each of the conductive elastic pieces has a conducting wire for abutting against one of the conductive belts Segment, two connecting segments located on two opposite sides of the conducting segment, and two inner hook segments respectively connected to the connecting segments, and the inner hook segments extend toward each other. The trigger switch according to claim 7, wherein the sliding base has a plurality of mounting grooves at the top and respectively for the conductive elastic pieces to be arranged, each of the mounting grooves has a groove bottom surface, and each of the conductive elastic pieces The inner hook sections are accommodated in respective installation grooves, and one of the inner hook sections of each conductive elastic sheet abuts against the bottom surface of the corresponding groove. The trigger switch according to claim 1, wherein the first housing base and the second housing base each have a sliding groove, and the sliding grooves are arranged opposite to each other in a left-to-right direction, and the conductive sliding seat set has a connection to The sliding seat of the pushing shaft, the conductive elastic pieces can be elastically arranged on the sliding seat and move with the sliding seat. The sliding seat has two sliding seats respectively formed on the left and right sides and slidably arranged on the sliding seats. Grooved slider. The trigger switch according to claim 1, wherein the trigger unit further has a trigger for pressing, and the trigger and the pushing shaft are integrally formed, and the pushing shaft is opposite to the end of the trigger to form a recessed groove, The conductive sliding seat set has a sliding seat connected to the pushing shaft, and the sliding seat has a molding strip embedded in the embedding groove.

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