CN117393353A

CN117393353A - Trigger switch

Info

Publication number: CN117393353A
Application number: CN202310751452.2A
Authority: CN
Inventors: 郭永铭; 张议丰; 施凯翔
Original assignee: Excel Cell Electronic Co Ltd
Current assignee: Excel Cell Electronic Co Ltd
Priority date: 2022-07-12
Filing date: 2023-06-25
Publication date: 2024-01-12
Also published as: TW202403805A; TWI811016B

Abstract

A trigger switch is suitable for being mounted on a power tool. The trigger switch comprises a shell seat unit, a control unit, a trigger unit and a steering unit. The control unit comprises a circuit board and a Hall element. The trigger unit is used for driving the electric tool to operate and comprises a sliding seat and a trigger unit. The sliding seat is provided with a magnetic strip seat part and a magnetic strip. The magnetic stripe seat is provided with a mounting hole for the magnetic stripe to be arranged. The trigger group is used for driving the sliding seat to move. The steering unit is used for changing the rotation direction of the electric tool. The magnetic strip seat part of the trigger unit extends along the front-back direction far away from the Hall element, so that the magnetic strip with larger size can be arranged to increase the magnetic force applied to the Hall element, and the magnetic force induction change between the Hall element and the magnetic strip is improved to improve the use effect.

Description

Trigger switch

Technical Field

The present invention relates to a trigger switch, and more particularly, to a trigger switch for an electric tool.

Background

The general electric tool is powered on and off by using a trigger switch and a circuit design, and is used for controlling the rotating speed and adjusting the steering.

Referring to fig. 1, a conventional trigger switch 1 includes a housing 11, a circuit board 12 disposed in the housing 11, a hall element 13 electrically connected to the circuit board 12, a trigger 14 capable of being pressed and extending into the housing 11, and a lever 15 rotatably disposed in the housing 11.

The trigger 14 has a push shaft 141 penetrating the housing 11, a conductive spring 142 disposed at the rear end of the push shaft 141 and electrically connected to the circuit board 12, and a magnet 143 disposed at the rear end of the push shaft 141. When the trigger 14 is pressed, the conductive spring 142 is electrically connected to the circuit board 12, so that the electric tool is switched from the off state to the on state. And the rotation speed of the electric tool is adjusted by changing the voltage by continuing to press the trigger 14 and reducing the distance between the magnet 143 and the hall element 13.

The shift lever 15 is shifted leftwards or rightwards, so that the electric tool can be driven to rotate forwards or reversely.

However, the magnet 143 has a small size and weak magnetic force, and the magnetic force induced change with the hall element 13 is low, so that the voltage change is not significant, and the rotation speed change of the electric tool is not obvious, so that the use effect is poor and the improvement is required.

Disclosure of Invention

The invention aims to provide a trigger switch which improves the magnetic force induction change and improves the use effect.

The trigger switch of the invention is suitable for being installed on a power tool. The trigger switch comprises a shell seat unit, a control unit, a trigger unit and a steering unit. The housing unit includes a chamber. The chamber has an opening extending in the front-rear direction and a pivot groove extending in the up-down direction. The control unit is arranged in the accommodating chamber and comprises a circuit board and a Hall element electrically connected with the circuit board. The trigger unit is operatively disposed to the housing unit and is configured to drive operation of the power tool. The trigger unit comprises a sliding seat and a trigger unit. The sliding seat is positioned in the accommodating chamber, can move relative to the circuit board along the front-back direction and is provided with a sliding seat body, a magnetic strip seat part, a conductive elastic sheet and a magnetic strip. The magnetic stripe part extends from the slide base body along the front-back direction towards a direction far away from the Hall element. The magnetic stripe portion has a mounting hole extending in the front-rear direction and opening forward. The conductive spring piece is arranged at the top end of the sliding seat body and is used for being electrically connected with the circuit board. The magnetic strips extend along the front-rear direction and are arranged in the mounting holes. The magnetic strip is provided with two magnetic poles which are oppositely arranged in the front-back direction. The spanner group can be pressed to penetrate through the opening and is used for driving the sliding seat to move. The steering unit is operatively disposed to the housing unit and is configured to change a direction of rotation of the power tool. The steering unit comprises a steering piece which is arranged in the pivot groove in a pivotable manner, and a steering spring piece which is arranged in the steering piece and can be in spring contact with the circuit board.

The trigger switch of the invention, the shell seat unit is provided with an abutting part which is positioned in the accommodating chamber and is arranged at intervals with the opening in the front-rear direction, the trigger group is provided with a trigger button for pressing, a push rod which extends backwards along the front-rear direction from the trigger button, is arranged in the opening in a penetrating way and is connected with the sliding seat, and an elastic piece which can be arranged between the push rod and the abutting part in a compressed way.

In the trigger switch of the present invention, the housing unit further has at least one limiting portion extending forward in the front-rear direction, and the trigger button has at least one guide member extending in the front-rear direction and slidable along the at least one limiting portion.

According to the trigger switch disclosed by the invention, the at least one limiting part is two plate bodies, the limiting parts are arranged at intervals along the up-down direction and respectively extend forwards along the front-back direction from the upper part and the lower part of the opening, and the at least one guide piece is a pair of grooves which are opposite at intervals along the left-right direction and extend along the front-back direction.

The trigger switch of the invention, the trigger button has a first connecting part, the pushing rod has a rod body penetrating the opening along the front-back direction, and a second connecting part formed on the rod body and detachably connected with the first connecting part.

According to the trigger switch disclosed by the invention, the first connecting part is tubular and is provided with the inner peripheral surface and the outer peripheral surface which are oppositely arranged along the radial direction, and the inner peripheral surface surrounds and defines the plug hole of which the opening faces the shell seat unit, the inner peripheral surface is concave-convex in the front-back direction, the aperture of the plug hole is gradually reduced from one end adjacent to the shell seat unit to one end far away from the shell seat unit, and the shape of the second connecting part is matched with the plug hole and is used for plugging the plug hole.

The trigger switch of the invention is characterized in that the first connecting part is also provided with a ring groove which is adjacent to the shell seat unit than the plug hole and has a larger aperture than the plug hole, at least one clamping groove which extends from the ring groove along the front-back direction towards the direction away from the shell seat unit and penetrates through the inner peripheral surface and the outer peripheral surface, the second connecting part is provided with a positioning ring which extends outwards along the radial direction and is used for clamping the ring groove, and at least one clamping block which extends from the positioning ring along the front-back direction towards the direction away from the shell seat unit and is used for clamping the at least one clamping groove.

The trigger switch of the invention, the said steering part has pivot which is pivoted to the said pivot slot, steering end for the said steering spring plate to set up, and locating part located between said steering end and said pivot, the said steering unit also includes the locating lever installed in the said locating part and made of metal, and locating spring plate located in the said container, the said locating spring plate has a plurality of locating slots that set up at intervals, the said locating lever is blocked into one of said locating slots selectively.

The trigger switch of the invention, the locating part is provided with a through groove extending along the up-down direction, the through groove is provided with a locating section with a round cross section and an open section with an arc cross section and facing the locating groove, and the locating rod is detachably arranged on the locating section and the open section along the up-down direction and partially exposed out of the open section.

According to the trigger switch disclosed by the invention, the shell seat unit is provided with the accommodating groove which extends forwards along the front-back direction and is used for the magnetic strip seat to extend in.

The invention has the beneficial effects that: the magnetic strip seat part of the trigger unit extends along the front-back direction far away from the Hall element, so that the magnetic strip with larger size can be arranged to increase the magnetic force of the magnetic strip, and the magnetic force induction change between the Hall element and the magnetic strip is improved to improve the use effect.

Drawings

Other features and advantages of the invention will be apparent from the following description of the embodiments with reference to the accompanying drawings, in which:

FIG. 1 is a cross-sectional view illustrating a prior art trigger switch;

FIG. 2 is a fragmentary perspective view illustrating an embodiment of the trigger switch of the present invention with a second housing of a housing unit of the embodiment removed;

FIG. 3 is a fragmentary, exploded perspective view of the embodiment;

FIG. 4 is a fragmentary sectional combination of the embodiment;

FIG. 5 is a schematic top view illustrating the mating relationship of the steering member, the positioning rod and the positioning spring of the steering unit according to the embodiment;

FIG. 6 is a view similar to FIG. 5, illustrating the steering member being turned left and the detent lever being snapped into the detent on the right side of the detent spring and the trigger button of the trigger unit of the embodiment being depressed;

FIG. 7 is a view similar to FIG. 5, illustrating turning the steering member to the right and snapping the detent lever into another detent on the left side of the detent spring, and the trigger button being depressed;

FIG. 8 is a cross-sectional view taken along line VIII-VIII in FIG. 5;

fig. 9 is a cross-sectional view taken along line ix-ix in fig. 7.

Detailed Description

Referring to fig. 2, 3 and 4, one embodiment of the trigger switch of the present invention is adapted for mounting on a power tool (not shown). The power tool may be a screwdriver, an electric drill or other tool with a rotating action. The trigger switch comprises 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 which are mutually engaged and cooperate in a left-right direction Y to define a housing 21. The chamber 21 has a sliding space 211 and a turning space 212 which are spaced apart in an up-down direction Z. The sliding space 211 is located below the steering space 212 and has an opening 213 extending in the front-rear direction X, and two sliding grooves 214 disposed opposite to each other in the left-right direction Y and extending in the front-rear direction X. The opening 213 has a fully circumferential groove 215. The sliding groove 214 is formed on the first housing 22 and the second housing 23, respectively. The steering space 212 has a pivot groove 216 extending in the up-down direction Z. The first housing 22 has a supporting table 221 disposed in the chamber 21, two limiting portions 222 disposed at intervals along the vertical direction Z and extending forward from above and below the opening 213, and an abutting portion 223 disposed in the chamber 21 and spaced apart from the opening 213 in the front-rear direction X. One of the limiting portions 222 is located above the other limiting portion 222 and has a receiving groove 224 extending along the front-rear direction X and having a rear side communicating with the sliding space 211.

The control unit 3 is disposed in the chamber 21 and includes a circuit board 31 fixed to the bottom side of the support base 221 and separating the sliding space 211 from the turning space 212, a hall element 32 electrically connected to the circuit board 31, and a flat cable 33 electrically connected to the circuit board 31 and penetrating out of the housing unit 2. The circuit board 31 is used for controlling the running and rotating direction of the electric tool.

The trigger unit 4 is operatively arranged to the housing unit 2 and is used to drive the operation of the power tool. The trigger unit 4 comprises a sliding seat 5 and a trigger set 6.

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

The slide base body 51 is approximately inverted U-shaped and has two sliding blocks 511 formed on the left and right sides respectively and slidably disposed in the sliding groove 214.

The magnetic stripe portion 52 extends from the top end of the slider body 51 along the front-rear direction X in a direction away from the hall element 32 and extends into the accommodating groove 224 of the first housing 22. The magnetic stripe portion 52 has a mounting hole 521 extending in the front-rear direction X and opening forward.

The conductive spring piece 53 is disposed at the top end of the sliding base body 51 and is used for electrically connecting with the lower surface of the circuit board 31.

The magnetic strip 54 extends in the front-rear direction X and is provided in the mounting hole 521. The magnetic stripe 54 has two magnetic pole ends 541 (fig. 8) disposed in the opposite direction X.

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

The trigger set 6 can be pressed through the opening 213 and is used for driving the sliding seat 5 to move. The trigger set 6 has a trigger button 61, a push rod 62, an elastic member 63, and a spacer 64.

The trigger button 61 is used for pressing and has two guide members 611 and a first connecting portion 612. The guide members 611 are disposed at intervals along the up-down direction Z, and slide along the limiting portions 222. The first connecting portion 612 is tubular and has an inner peripheral surface 613 and an outer peripheral surface 614 which are disposed in radial opposition, a receptacle 615 which is defined by the inner peripheral surface 613 around and opens toward the housing unit 2, a ring groove 616 which is adjacent to the housing unit 2 than the receptacle 615 and has a larger aperture than the receptacle 615, and two clamping grooves 617 which are disposed opposite to each other in radial direction and extend forward from the ring groove 616 and penetrate the inner peripheral surface 613 and the outer peripheral surface 614. The inner peripheral surface 613 undulates in the front-rear direction X. The aperture of the receptacle 615 tapers from an end adjacent to the housing unit 2 to an end remote from the housing unit 2.

In this embodiment, the limiting portion 222 is two plates, and each of the guiding members 611 is a pair of grooves that are opposite to each other in the left-right direction Y and extend along the front-rear direction X, so as to improve the stability of the trigger button 61 when pressed, and the hand feeling is better. However, in other variations, each guide 611 may be two support plates (not shown) spaced up and down and supported by the limiting portion 222, which can also achieve the guiding function. In other variations, only one guide 611 and one stopper 222 may be provided. Or, the guide piece 611 and the limiting portion 222 are directly omitted, and the trigger set 6 is not affected to drive the sliding seat 5 to move.

The push rod 62 has a shaft 621 penetrating the opening 213 in the front-rear direction X and connected to the sliding seat 5, and a second connection portion 622 formed on the shaft 621 and detachably connected to the first connection portion 612. The shaft 621 has an insertion groove 623 into which the slider body 51 is inserted, and a circular hole 624 open toward the abutting portion 223. The second connection portion 622 extends forward from the shaft 621 and is shaped to fit into the receptacle 615 and is plugged into the receptacle 615. The second connecting portion 622 has a positioning ring 625 protruding outward from the outer surface in the radial direction and configured to be clamped in the ring groove 616, and two clamping blocks 626 extending forward from the positioning ring 625 in the front-rear direction X and configured to be respectively clamped in the clamping grooves 617.

In the present embodiment, the number of the clamping grooves 617 of the first connecting portion 612 and the number of the clamping blocks 626 of the second connecting portion 622 are two, but in other variations, only one clamping groove 617 of the first connecting portion 612 and one clamping block 626 of the second connecting portion 622 may be used, so as to achieve the effect of increasing positioning. It should be noted that, the second connecting portion 622 is inserted into the plug hole 615 of the first connecting portion 612 to achieve the positioning effect, so in other variations, the ring groove 616 and the positioning ring 625, and the clamping groove 617 and the clamping block 626 may be omitted.

In this embodiment, the trigger button 61 and the pushing rod 62 are detachably assembled together by the first connecting portion 612 and the second connecting portion 622, so that a user can replace the trigger button 61 as required, and the usability can be improved. And the use cost can be reduced because the trigger button 61 and the pushing rod 62 do not need to be replaced at the same time. In addition, the first connecting portion 612 and the second connecting portion 622 may be screw holes (not shown) and screws (not shown), or the first connecting portion 612 and the second connecting portion 622 may be integrally formed, but 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 push rod 62 and the other end is pushed against the abutment 223 of the first housing 22. When the trigger button 61 is pressed to move the sliding seat 5 in the direction of the abutting portion 223, the elastic member 63 is compressed to store a potential energy for constantly resetting the trigger set 6 outwards.

The spacer 64 is inserted into the groove 215 of the opening 213 and slidably contacts the push rod 62. The gasket 64 has a dust-proof effect of preventing dust and foreign matter from entering the opening 213. Further, by incorporating the spacer 64 into the opening 213, the resistance of the trigger set 6 when actuated can be reduced, so that the trigger set 6 can be easily pressed to enhance the operational feeling.

Referring to fig. 3, 4 and 5, the steering unit 7 is operatively disposed in the steering space 212 of the housing unit 2 and is 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 spring 73, a positioning spring 74 and a washer 75.

Referring to fig. 5 to 9, the steering member 71 has a pivot shaft 711 pivoted to the pivot groove 216, a pulling end 712 and a steering end 713 disposed in opposite directions, and a positioning portion 714 disposed between the steering end 713 and the pivot shaft 711. The positioning portion 714 has a through groove 715 extending in the up-down direction Z. The through groove 715 has a positioning section 716 with a circular cross section, and an open section 717 with an arc cross section and connected to the lower side of the positioning section 716.

The positioning rod 72 is made of metal and is detachably inserted into the positioning section 716 and the open section 717 along the up-down direction Z, and is partially exposed from the open section 717.

The steering spring 73 is disposed at the bottom side of the steering end 713 and may be resiliently contacted to the upper surface of the circuit board 31.

The positioning spring 74 is fixed on the top side of the supporting table 221, and has a plurality of positioning slots 741 disposed at intervals and having openings facing the positioning portions 714, and the open sections 717 facing the positioning slots 741. The positioning rod 72 is selectively engaged with one of the positioning grooves 741 to position the steering member 71.

In this embodiment, the positioning rod 72 is made of metal, so that the service life of the positioning rod is prolonged due to wear resistance, the positioning rod 72 is detachably mounted in the through groove 715, and the positioning rod 72 is only required to be replaced after the positioning rod is worn, so that the use cost is low. However, in other variants, the positioning rod 72 may be integrally formed with the steering member 71.

The gasket 75 is sleeved on the pivot 711 and is accommodated in the pivot groove 216, so that the dustproof effect is achieved.

In this embodiment, the number of the positioning grooves 741 is three. As shown in fig. 5 and 8, when the positioning rod 72 is engaged with the positioning groove 741 in the middle, the electric tool is in a non-rotated state (the electric tool is not rotated). As shown in fig. 6, when the pulling end 712 of the steering member 71 is pulled to the left, the positioning lever 72 is engaged with the positioning groove 741 on the right, and the trigger button 61 is pressed to bring the electric tool into a state of normal rotation. As shown in fig. 7 and 9, when the pulling end 712 of the steering member 71 is pulled to the right, the positioning rod 72 is engaged with the left positioning groove 741, and the trigger button 61 is pressed to make the electric tool in a reverse operation state.

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

One of the magnetic pole ends 541 of the magnetic strip 54 is distant from the trigger knob 61 in the front-rear direction X, and the other of the magnetic pole ends 541 of the magnetic strip 54 is adjacent to the trigger knob 61 in the front-rear direction X. By gradually pressing the trigger button 61 inward, the distance between one of the magnetic pole ends 541 and the hall element 32 can be increased, so that the magnetic force between the hall element 32 and the magnetic strip 54 is changed to change the voltage, and the circuit board 31 outputs a change signal to adjust the rotation speed of the electric tool.

The voltage is proportional to the rotational speed of the power tool due to the magnetic force induction between the hall element 32 and the magnetic strip 54. The magnetic strip 54 with larger size and longer length can be arranged by extending the magnetic strip seat 52 outwards along the front-rear direction X, so that the magnetic force applied to the Hall element 32 and the magnetic force induction change between the Hall element 32 and the magnetic strip 54 are improved, the rotating speed change of the electric tool is further improved, and the use effect during operation can be improved.

According to the invention, the magnetic strip seat 52 of the trigger unit 4 extends along the front-rear direction X in a direction far away from the Hall element 32, so that the magnetic strip 54 with a larger size is arranged to increase the magnetic force applied to the Hall element 32, and the magnetic force induction change between the Hall element 32 and the magnetic strip 54 is improved to improve the use effect. Therefore, the object of the present invention can be achieved.

The foregoing is merely illustrative of the present invention and is not intended to limit the scope of the invention, which is defined by the appended claims and their equivalents.

Claims

1. A trigger switch adapted for mounting on a power tool, comprising: the trigger switch includes:

the shell seat unit comprises a containing chamber, wherein the containing chamber is provided with an opening extending along the front-back direction and a pivot groove extending along the up-down direction;

the control unit is arranged in the accommodating chamber and comprises a circuit board and a Hall element electrically connected with the circuit board;

the trigger unit is arranged on the shell seat unit in an operating mode and used for driving the electric tool to operate, the trigger unit comprises a sliding seat and a pulling set, the sliding seat is arranged in the accommodating chamber and can move relative to the circuit board along the front-back direction and is provided with a sliding seat body, a magnetic strip seat part, a conductive elastic sheet and a magnetic strip, the magnetic strip seat part extends from the sliding seat body along the front-back direction towards a direction far away from the Hall element, the magnetic strip seat part is provided with a mounting hole which extends along the front-back direction and is opened forward, the conductive elastic sheet is arranged at the top end of the sliding seat body and is used for being electrically connected with the circuit board, the magnetic strip extends along the front-back direction and is arranged in the mounting hole, the pulling set is provided with two magnetic poles which are reversely arranged along the front-back direction and can be pressed through the opening and is used for driving the sliding seat to move; a kind of electronic device with high-pressure air-conditioning system

The steering unit is arranged on the shell seat unit in an operating way and used for changing the rotating direction of the electric tool and comprises a steering piece which is arranged in the pivot groove in a pivotable way and a steering spring piece which is arranged on the steering piece and can be in spring contact with the circuit board.

2. The trigger switch of claim 1, wherein: the shell seat unit is provided with an abutting part which is positioned in the accommodating chamber and is arranged at intervals in the front-rear direction with the opening, the trigger group is provided with a trigger button for pressing, a push rod which extends backwards along the front-rear direction by the trigger button and is penetrated in the opening and is connected with the sliding seat, and an elastic piece which can be compressively arranged between the push rod and the abutting part.

3. The trigger switch of claim 2, wherein: the housing unit further has at least one stopper extending forward in the front-rear direction, and the trigger button has at least one guide extending in the front-rear direction and slidable along the at least one stopper.

4. A trigger switch as claimed in claim 3, wherein: the at least one limiting part is two plate bodies, is arranged at intervals along the up-down direction and extends forwards along the front-back direction from the upper part and the lower part of the opening respectively, and the at least one guide piece is a pair of grooves which are opposite at intervals along the left-right direction and extend along the front-back direction.

5. The trigger switch of claim 2, wherein: the trigger button is provided with a first connecting part, the pushing rod is provided with a rod body penetrating through the opening along the front-back direction, and a second connecting part which is formed on the rod body and is detachably connected with the first connecting part.

6. The trigger switch of claim 5, wherein: the first connecting part is tubular and is provided with an inner peripheral surface and an outer peripheral surface which are reversely arranged along the radial direction, and a plug hole which is formed by surrounding the inner peripheral surface by a limiting opening and faces the shell seat unit, wherein the inner peripheral surface is rugged along the front-back direction, the aperture of the plug hole is gradually reduced from one end adjacent to the shell seat unit to one end far away from the shell seat unit, and the shape of the second connecting part is matched with the plug hole and is used for plugging the plug hole.

7. The trigger switch of claim 6, wherein: the first connecting part is also provided with a ring groove which is adjacent to the shell seat unit than the plug hole, the aperture of the ring groove is larger than that of the plug hole, at least one clamping groove which extends from the ring groove along the front-back direction towards the direction away from the shell seat unit and penetrates through the inner peripheral surface and the outer peripheral surface, the second connecting part is provided with a positioning ring which extends outwards along the radial direction and is used for being clamped in the ring groove, and at least one clamping block which extends from the positioning ring along the front-back direction towards the direction away from the shell seat unit and is used for being clamped in the at least one clamping groove.

8. The trigger switch of claim 1, wherein: the steering unit further comprises a positioning rod which is arranged on the positioning part and made of metal, and a positioning elastic sheet which is arranged in the accommodating chamber, wherein the positioning elastic sheet is provided with a plurality of positioning grooves which are arranged at intervals, and the positioning rod is selectively clamped into one of the positioning grooves.

9. The trigger switch of claim 8, wherein: the positioning part is provided with a penetrating groove extending along the vertical direction, the penetrating groove is provided with a positioning section with a circular cross section and an open section with an arc cross section and facing the positioning groove, and the positioning rod is detachably penetrated in the positioning section and the open section along the vertical direction and partially exposed out of the open section.

10. The trigger switch of claim 1, wherein: the shell seat unit is provided with a containing groove which extends forwards along the front-back direction and is used for the magnetic stripe seat to extend in.