CN212365786U - Switch assembly and electric tool - Google Patents

Abstract

The utility model discloses a switch module and electric tool. The switch assembly includes: the switch comprises a contact for controlling the on-off of the switch; the trigger comprises a transmission unit which can drive the trigger to move to trigger or separate from the contact; the poking button comprises a limiting unit which is matched and connected with the transmission unit, and the limiting unit guides or limits the transmission unit to move; the limiting unit includes: the trigger is limited to move towards the direction of the trigger contact when the transmission unit is located at the locking position; when the transmission unit is located at the opening position, the trigger triggers the contact and can reset to the locking position at any time; an open holding position, wherein the trigger is locked to maintain contact with the contact when the transmission unit is located at the open holding position; and a biasing member that provides a biasing force to the toggle and trigger to return to the locked position. The utility model provides a simple structure, be convenient for operation and use and switch module and electric tool that the reliability is high.

Description

Switch assembly and electric tool

Technical Field

The utility model relates to an electric tool technical field especially relates to a switch module and electric tool.

Background

Generally, a switch assembly is required to be disposed on an electric tool to open and close the electric tool, such as a button switch of an electric tool, such as a hot air gun, an electric drill, and an electric screwdriver. The switch assembly on the general electrician tool realizes opening and closing the electrician tool through the cooperation of trigger and dial knob, and among the current electrician tool, the structure of switch assembly is complicated, and switch assembly when switching off with the on-state, the operation is too loaded down with trivial details, switches off and the in-process of on-state, and the trigger breaks away from with dial knob easily, leads to the switch assembly to become invalid, and the reliability is not high.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problem, the utility model provides a simple structure, be convenient for operation and use and switch module and electric tool that the reliability is high.

In a first aspect, the present invention provides a switch assembly, wherein, include:

the switch comprises a contact for controlling the on-off of the switch;

the trigger comprises a transmission unit which can drive the trigger to move so as to trigger or separate from the contact;

the poking button comprises a limiting unit which is matched and connected with the transmission unit, and the limiting unit guides or limits the transmission unit to move;

the limiting unit includes:

a locking position in which the trigger is restricted from moving in a direction to trigger the contact when the transmission unit is in the locking position;

when the transmission unit is located at the opening position, the trigger triggers the contact and can be reset to the locking position at any time;

an open holding position in which the trigger is locked to maintain contact with the contact when the transmission unit is in the open holding position;

and a biasing member that provides a biasing force to the toggle and the trigger to return to the locked position.

Optionally, the open position is located on a path of movement from the locked position to the open hold position.

Optionally, the transmission unit includes a pin shaft disposed on the trigger, the limiting unit includes a groove disposed on the dial knob, and the pin shaft is adapted to be inserted into the groove.

Optionally, the groove comprises an actuating groove and a retaining groove which are communicated with each other, and the actuating groove and the retaining groove intersect.

Optionally, the open position is located in the activation slot, and the open retention position is located in the retention slot.

Optionally, the open position is at a position where the retaining groove intersects the actuating groove.

Optionally, the groove is an L-shaped groove, and the starting groove and the holding groove are two sides of the L-shape respectively.

Optionally, the limiting unit further includes a limiting rib, and the limiting rib limits the pin shaft to the locking position.

Optionally, the number of the grooves is two, and the two grooves are symmetrically arranged on two sides of the limiting rib.

Optionally, the biasing force member comprises a first biasing force member and a second biasing force member, the first biasing force member providing a biasing force to the trigger to disengage the trigger from the contact; the second biasing force member provides the toggle to a biasing force that causes the toggle to be centered in the left-right direction.

In a second aspect, the present invention provides an electric power tool, wherein, include:

a housing;

the working mechanism is arranged in the shell;

the power source provides energy for the working mechanism;

the switch assembly controls the operation of the working mechanism, and the switch assembly is the switch assembly;

the housing includes:

a first mounting hole for mounting the trigger, the trigger being movable in the first mounting hole in a front-rear direction;

the second mounting hole is used for mounting the shifting knob, and the shifting knob can move in the left and right directions in the second mounting hole;

the switch is arranged in the shell.

Optionally, the electric tool is a heat gun, and the heat gun further includes:

the air inlet is arranged on the shell;

the air outlet is arranged at the front end of the shell;

the working mechanism comprises:

the air blowing unit is arranged in the shell and is positioned between the air inlet and the air outlet;

the heating unit is arranged in the shell, is positioned at the upstream of the air outlet and is used for heating the air flow;

the blowing unit and the heating unit are both connected with the switch assembly.

Optionally, the electric tool is an electric drill or an electric screwdriver, the working mechanism includes a motor and an output unit driven by the motor, and the motor is connected with the switch assembly so that the switch assembly controls the on-off of the motor.

The utility model discloses an useful part lies in: the switch component of the utility model has simple integral structure and lower cost, can realize three functions of locking and closing, opening and locking and opening, and is convenient to use; the toggle comprises a limiting unit which is matched and connected with a transmission unit of the trigger, and the limiting unit can guide or limit the transmission unit to move, so that the transmission unit can be always matched with the limiting unit, the trigger and the toggle can be always matched and cannot be separated, the switch assembly cannot lose efficacy, and the reliability of the switch assembly is improved; because the limiting unit can guide or limit the transmission unit to move, the switch assembly is easy and convenient to operate when the on-off state is switched, and single-hand operation can be realized.

Drawings

FIG. 1 is a schematic side view of an embodiment of a power tool of the present invention;

FIG. 2 is a schematic view of the internal structure of the power tool of the present invention;

fig. 3 is a schematic perspective view of the switch assembly of fig. 2 with the switch assembly removed according to the present invention;

fig. 4 is an enlarged view of a portion a of fig. 3 according to the present invention;

FIG. 5 is a schematic front view of the structure of FIG. 2 according to the present invention;

fig. 6 is a schematic perspective view of an embodiment of a switch assembly according to the present invention;

fig. 7 is an exploded view of an embodiment of a switch assembly of the present invention;

fig. 8 is a schematic bottom view of the middle toggle button according to the embodiment of the present invention;

fig. 9 is a schematic bottom view of another embodiment of the middle toggle button of the present invention;

FIG. 10 is an exploded view of the trigger of the present invention;

fig. 11 is a schematic bottom view of a second embodiment of the middle toggle button of the present invention;

fig. 12 is a schematic perspective view of a third embodiment of the switch assembly in the first state according to the present invention;

figure 13 is a rear view schematic of the structure of figure 12 in accordance with the present invention;

fig. 14 is a rear view of a third embodiment of the switch assembly of the present invention in a second state;

fig. 15 is a schematic perspective view of a third embodiment of the switch assembly in a third state according to the present invention;

fig. 16 is a schematic perspective view of a fourth embodiment of a switch assembly according to the present invention;

fig. 17 is a schematic side view of a fifth embodiment of a switch assembly of the present invention in a first state;

fig. 18 is a schematic side view of a fifth embodiment of the switch assembly of the present invention in a second state;

fig. 19 is a schematic side view of a fifth embodiment of the switch assembly according to the present invention in a third state.

In the figure:

100. a switch assembly;

200. an electric tool; 210. a housing; 211. a rib; 212. a first mounting hole; 213. a second mounting hole;

300. a trigger; 310. a pin shaft; 320. a trigger body; 330. a traveler; 340. a feeler lever; 350. a third biasing force member; 360. mounting blocks; 361. a through hole; 370. a top pillar; 371. a clamping hole; 380. a baffle plate; 381. a first jack; 382. a second jack; 391. a baffle groove; 392. a stopper wall;

400. dialing and twisting; 410. a groove; 411. starting a groove; 412. a holding groove; 413. a transition section; 414. an anti-drop part; 420. limiting ribs; 430. a second biasing force member; 440. a mounting cavity; 450. a limiting column; 460. a limiting block; 470. a card slot; 480. a hook; 490. a protrusion;

500. a switch; 510. a contact;

600. a power source.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.

The utility model discloses an electric tool please combine fig. 1 and fig. 2, the utility model discloses an electric tool 200 includes casing 210, operating device, power supply 600 and switch module 100. The working mechanism is disposed in the cabinet 210, the power source 600 is used for providing power to the working mechanism, and the power source 600 may be a battery pack.

The utility model discloses still including the switch module 100 that is used for the control instrument to open and close, wherein switch module 100 sets up in casing 210, and switch module 100 can control operating device's operation. As shown in fig. 2 and 3, the housing 210 includes a first mounting hole 212 and a second mounting hole 213, the trigger 300 is inserted into the first mounting hole 212, a portion of the trigger 300 is located inside the housing 210, and another portion of the trigger 300 is located outside the housing 210, so that the trigger 300 can be pulled from the outside of the power tool 200, and the trigger 300 can move in the front-rear direction in the first mounting hole 212. The second mounting hole 213 is used for mounting the toggle 400, the toggle 400 can move in the second mounting hole 213 in the left and right directions, as shown in fig. 5, the left and right ends of the toggle 400 penetrate out from the left and right sides of the housing 210, so that the toggle 400 can be pushed from the left and right sides of the housing 210. The switch 500 of the switch assembly 100 is disposed within the housing 210 and behind the trigger 300.

In one embodiment, the electric tool 200 is a heat gun, the heat gun further includes an air inlet disposed on the housing 210 and an air outlet disposed at the front end of the housing 210, the operating mechanism includes a blower unit and a heating unit, the blower unit and the heating unit are both connected to the switch 500 of the switch assembly 100, the blower unit is disposed in the housing 210 and located between the air inlet and the air outlet, the heating unit is disposed in the housing 210 and located upstream of the air outlet, the air flow enters the housing 210 from the air inlet, and after being heated by the heating unit, flows out from the air outlet, thereby implementing the function of the heat gun.

In another embodiment, the power tool 200 may also be a power drill or a power screwdriver, and the working mechanism includes a motor and an output unit driven by the motor, and the motor is connected to the switch 500 of the switch assembly 100, so that the switch assembly 100 controls the on/off of the motor.

Referring to fig. 1 to 6, in an embodiment of the present invention, a switch assembly 100 is applied to an electric tool 200. As shown in fig. 6, the switch assembly 100 includes a switch 500, a trigger 300, and a toggle 400. As shown in fig. 2, the switch 500 includes a contact 510 for controlling the on/off of the switch, and the switch 500 may be, for example, a control circuit board, which can control the on/off of the power tool 200. The trigger 300 comprises a transmission unit which can drive the trigger 300 to move to trigger or separate from the contact 510, the toggle 400 comprises a limiting unit which is in fit connection with the transmission unit and guides or limits the transmission unit to move, as shown in fig. 6 and 7, in one embodiment, the transmission unit adopts a pin 310, the limiting unit adopts a groove 410, the pin 310 is inserted into the groove 410 and is matched with the groove 410, when the trigger 300 is pressed, the pin 310 can move in the groove 410, and the groove 410 can guide or limit the movement of the pin 310, so that the trigger 300 is located at the position of triggering the contact 510 or at the position of separating from the contact 510, and the on-off of the switch 500 is realized. It will be appreciated that the trigger 300 may also be provided with a recess 410 and the toggle 400 may be provided with a pin 310.

As shown in fig. 8 and 9, the groove 410 includes a locking position a, an opening position b, and an opening maintaining position c. Referring to fig. 2, 8 and 9, when the pin 310 is located at the locking position a, the trigger 300 is limited to move towards the trigger contact 510, and specifically, the movement of the trigger 300 towards the trigger contact 510 is limited by the limiting rib 420, as shown in fig. 8 and 9, the limiting unit further includes the limiting rib 420, when the pin 310 is located at the locking position a, the limiting rib 420 abuts against the rear end of the pin 310, so that the pin 310 is limited by the limiting rib 420 at the locking position a, the trigger 300 is limited to move towards the trigger contact 510, and at this time, the trigger 300 is separated from the contact 510, and the switch 500 is in the off state. When the pin 310 is located at the locking position a, the trigger 300 is limited by the limiting rib 420 to move towards the direction of the trigger contact 510, so that the safety performance of the power tool 200 can be improved, and the trigger contact 510 is prevented from being accidentally pressed down to open the switch 500.

When the pin 310 is located at the opening position b, the trigger 300 triggers the contact 510, the trigger 300 can be reset to the locking position a at any time, and the switch 500 is in an opening state at this time, but the trigger 300 can be reset to the locking position a at any time, that is, as long as the trigger 300 is released, the trigger 300 can be restored to the locking position a, the pin 310 located at the opening position b is suitable for the situation of temporarily opening the switch 500, when the switch 500 is used, the pin 310 is located at the opening position b by pressing the trigger 300, the switch 500 is triggered, the trigger 300 can be reset to the locking position a by releasing the trigger 300, and the switch 500 is turned off, so.

When the pin 310 is located at the opening holding position c, the trigger 300 is locked to be kept in contact with the contact 510, that is, when the pin 310 is located at the opening holding position c, the trigger 300 is not only in contact with the contact 510 but also locked in a state of being in contact with the contact 510, even if the trigger 300 is released, the trigger 300 can be kept in contact with the contact 510, so that the switch 500 is always in an opening state, the function of releasing the trigger 300 to keep the switch 500 in the opening state is suitable for a situation that the power tool 200 is used for a long time, and the operator is not required to press the trigger 300 all the time when the power tool 200 is used for a long time, so that the operator is not easily fatigu.

The switch assembly 100 also includes a biasing member, which may be a spring, that provides a biasing force to the toggle 400 and trigger 300 to return them to the locked position.

In one embodiment, as shown in fig. 8 and 9, the open position b is located on the path from the locking position a to the open holding position c, such that the trigger 300 is moved to the open position b and then moved to the open holding position c, as mentioned above, the open position b requires to press the trigger 300 all the time to keep the switch 500 open, which is suitable for the short-term use of the power tool 200, and the open holding position c can keep the switch 500 open under the condition of releasing the hand, which is suitable for the long-term use of the power tool 200, and the open position b is located on the path from the locking position a to the open holding position c, which is in accordance with the habit of use, the trigger 300 is moved to the short-term use position, and if the power tool 200 needs to be used for a long time, only the trigger 300 needs to be continuously pulled to the open holding position c.

In the present invention, the shape of the groove 410 is not particularly limited as long as the groove 410 can be formed with the locking position a, the opening position b, and the opening holding position c. In one embodiment, as shown in fig. 8 and 9, the groove 410 includes an actuating groove 411 and a retaining groove 412 that are in communication with each other, the actuating groove 411 intersecting the retaining groove 412 to allow the pin 310 to move between the actuating groove 411 and the retaining groove 412. The opening position a is located in the actuating slot 411, the opening holding position c is located in the holding slot 412, and the opening position b is located at a position where the holding slot 412 intersects with the actuating slot 411.

As shown in fig. 8 and 9, the groove 410 is substantially an L-shaped groove, the actuating groove 411 and the holding groove 412 are two sides of the L-shape, respectively, as shown in fig. 8 and 9, the actuating groove 411 extends substantially in the front-rear direction, and the holding groove 412 extends leftward or rightward from the rear end of the actuating groove 411 to form an L-shaped groove.

As shown in fig. 8 and 9, the holding groove 412 includes a transition portion 413 and a retaining portion 414, the transition portion 413 is substantially perpendicular to the activation groove 411, and the retaining portion 414 is substantially parallel to the activation groove 411. The retaining portion 414 is formed to extend forward from a front sidewall of the transition portion 413 so that a rear end of the retaining portion 414 communicates with the transition portion 413, and the retaining portion 414 is formed with a front sidewall, a left sidewall, and a right sidewall so that the restraining pin 310 is locked at the opening holding position c.

In one embodiment, the biasing force members include a first biasing force member providing a biasing force to the trigger 300 to disengage the contact 510 and a second biasing force member 430 (see fig. 4) providing a biasing force to the toggle 400 to center the toggle 400 in the left-right direction. In the embodiment shown in fig. 9, the start slot 411 is located approximately at the middle of the toggle 400 in the left-right direction, and the holding slot 412 extends leftward from the rear end of the start slot 411. As shown in fig. 9, when the power tool 200 is not in use, the trigger 300 is in the lock position a, and the switch 500 is in the off state; when the electric tool 200 is used, the trigger 300 is buckled by the forefinger, the poke button 400 is pushed by the thumb, the poke button 400 is pushed rightwards by the thumb, the limitation of the limit rib 420 on the pin shaft 310 is removed, then the forefinger pulls the trigger 300 backwards, when the trigger 300 moves backwards to the opening position b along the starting groove 411, the trigger 300 is contacted with the contact 510 of the switch 500, and the switch 500 is in the opening state; at this moment, the whole machine is in a working state, but is not locked in the working state, and the user can enable the guide pin 310 to rebound to the position a at any time by loosening the forefinger, so that the user can enable the whole machine to stop working at any time by loosening the forefinger, the operation mode is suitable for short-time operation, and the user can flexibly control the start and stop of the whole machine.

When the index finger continues to push the toggle 400 to the right after the guide pin moves to the b point position in the previous step, the trigger 300 will move forward to the open holding position c under the action of the first biasing force member, i.e. to the anti-slip part 414, and at this time, the toggle 400 and the trigger 300 will be released, although the toggle 400 will have a centering force moving to the left under the action of the second biasing force member 430, because the right side wall of the anti-slip part 414 will abut against the pin 310 of the trigger 300, the trigger 300 and the toggle 400 can be locked with each other, so that the trigger 300 is locked at the open holding position c. When it is desired to turn off the power tool 200, the trigger 300 can be automatically returned to the locking position a by pulling the trigger 300 backward to move the trigger 300 backward from the open holding position c, moving the toggle 400 leftward by the neutral force, and then releasing the trigger 300. At the moment, even if the user loosens the operating finger, the whole machine is still kept in the working state, so that when the user needs to operate for a long time, the user can be prevented from pressing the switch assembly by hands all the time, and the operation fatigue is reduced.

The switch assembly 100 of the utility model can be operated by one hand, and can be operated by only matching the thumb and the index finger of one hand, thus the operation is simple and convenient; in the operation process, the pin shaft 310 is always matched in the groove 410, and the groove 410 guides the pin shaft 310, so that the phenomenon that the trigger 300 is easily separated from the toggle 400 is avoided, the switch assembly 100 is prevented from being out of service, and the reliability of the switch assembly 100 is improved; the switch assembly 100 can be locked, closed, temporarily opened and locked, and is convenient to use for a long time, the overall structure design conforms to the use habit, the operation is simple and convenient, and only the trigger 300 needs to be pulled to restore from the locked open state to the locked closed state.

In one embodiment, as shown in fig. 8, two grooves 410 are provided, and the two grooves 410 are symmetrically disposed on both sides of the position-limiting rib 420. Therefore, the switch 500 can be turned on or off by pushing the dial knob 400 leftwards or rightwards, and the switch is suitable for left-handed and right-handed people.

As shown in fig. 8, the front ends of the two grooves 410 are communicated, so that the toggle 400 can be pushed to the left or to the right, the communication position is the locking position a, the locking positions a of the two grooves 410 are overlapped, and the locking position a is the middle position of the toggle 400 along the left-right direction, so that the toggle 400 automatically returns to the locking position a after returning to the middle position.

In the embodiment shown in fig. 8, there are two recesses 410, two recesses 410 are symmetrically disposed left and right, the holding groove 412 of the left recess 410 extends leftward from the rear end of the actuating groove 411, and the holding groove 412 of the right recess 410 extends rightward from the rear end of the actuating groove 411.

Referring to fig. 6 and 7, the toggle 400 may be disposed either above the trigger 300 or below the trigger 300. The utility model discloses in will dial and turn round 400 setting in trigger 300 top, be more convenient for the operation like this and be more convenient for holistic structural design. As shown in fig. 6, when the knob 400 is disposed above the trigger 300, the groove 410 is disposed at the bottom of the knob 400 and the pin 310 is disposed at the top of the trigger 300 such that the pin 310 is engaged with the groove 410.

As previously described, referring to fig. 4, the toggle 400 can be centered by providing a second biasing force 430. Specifically, please refer to fig. 4 and 7, a mounting cavity 440 is disposed at a middle position of the toggle 400 along the left-right direction, and the mounting cavity 440 is used for mounting the second biasing force member 430. As shown in fig. 4, the housing 210 of the power tool 200 is provided with a rib 211, and the rib 211 can abut against the end of the second biasing member 430. In fig. 4, only one half of the housing 210 is shown, the housing 210 includes left and right halves, and fig. 4 shows only the right half, and each housing half 210 is provided with ribs 211, and the ribs 211 of the housing halves 210 abut against the left and right ends of the second biasing force member 430, respectively. As shown in fig. 7, the second biasing force member 430 is disposed in the mounting cavity 440, the left and right ends of the mounting cavity 440 are provided with limit ribs for limiting the second biasing force member 430, and the two ends of the second biasing force member 430 abut against the limit ribs. Referring to fig. 4 and 7, when the toggle 400 is pushed to the right, the limiting rib at the left end of the mounting cavity 440 presses the second biasing force member 430 to the right, and the right end of the second biasing force member 430 abuts against the rib 211 of the right housing half 210, so that the toggle 400 has a centering force to the left by the second biasing force member 430. The situation when the dial knob 400 is pushed to the left is the same as the situation when the dial knob 400 is pushed to the right, and the description thereof is omitted.

It is understood that the second biasing force member 430 may be disposed not only at the middle position of the knob 400, but also at the left and right sides of the knob 400, for example, the second biasing force member 430 is disposed at the left and right sides of the knob 400, one end of the left second biasing force member 430 abuts against the left housing half 210, the other end abuts against the left side of the knob 400, one end of the right second biasing force member 430 abuts against the right housing half 210, and the other end abuts against the right side of the knob 400. The second biasing force member 430 is disposed at the middle position of the toggle 400, so that the overall structure is more simplified, centering of the toggle 400 can be achieved only by one second biasing force member 430, the number of parts is reduced, and the installation is simpler without installing more second biasing force members 430.

Referring to fig. 10, the trigger 300 further includes a trigger body 320 and a spool 330. Referring to fig. 2 and 10, the sliding post 330 is disposed in the housing 210 along the front-back direction, the trigger body 320 is sleeved on the sliding post 330, the trigger body 320 can move back and forth on the sliding post 330, the sliding post 330 guides the movement of the trigger body 320, and the trigger body 320 moves back and forth to approach the switch 500 and get away from the switch 500. The pin 310 is disposed on top of the trigger body 320.

The first biasing force member may be disposed between the spool 330 and the trigger body 320, for example, one end of the first biasing force member abuts against the spool 330, and the other end abuts against the trigger body 320, and those skilled in the art can easily understand how to assemble the first elastic member, the spool 330 and the trigger body 320 to realize the forward biasing force generated when the trigger body 320 is pulled backwards, and the description thereof is omitted here. Alternatively, the spool 330 may be eliminated and a guide structure of a slider and a guide groove may be provided between the trigger body 320 and the housing 210 to move the trigger body 320 forward and backward.

With continued reference to FIG. 10, the trigger 300 further includes a trigger lever 340 and a third biasing force member 350. The contact rod 340 is slidably disposed on the trigger body 320, and referring to fig. 2 and 10, the contact rod 340 is used to contact the contact 510 of the switch 500. As shown in FIG. 10, the third biasing member 350 is disposed between the contact lever 340 and the trigger body 320. the third biasing member 350 provides a cushioning force when the contact lever 340 contacts the contact 510 to prevent hard contact from damaging the contact 510. In addition, as shown in fig. 9, since the pin 310 needs to be moved forward to the opening holding position c after being moved to the opening position b, which is a distance from the opening holding position c in the front-rear direction, the third biasing member 350 is provided to allow the contact lever 340 to push against the contact 510 at both the opening position b and the opening holding position c.

As shown in fig. 10, the third biasing member 350 may be a spring, the diameter of the front end of the contact rod 340 is smaller, the diameter of the rear end of the contact rod 340 is larger, the spring is sleeved on the smaller diameter portion of the front end of the contact rod 340, the rear end of the spring abuts against the end surface of the larger diameter portion of the rear end of the contact rod 340, and the front end of the spring abuts against the trigger body 320. It will be appreciated that the first resilient member may be assembled with the spool 330 and the trigger body 320 in a manner that the third biasing member 350 is assembled with the trip lever 340 and the trigger body 320. In addition, the length of the third biasing force member 350 needs to be longer than the length of the smaller diameter portion of the front end of the trolley 340 so that the trolley 340 has a space to slide back and forth.

Referring to fig. 10, the trigger 300 further includes a mounting block 360, and referring to fig. 7 and 10, the mounting block 360 is disposed at the rear end of the trigger body 320, a through hole 361 extending in the front-back direction is disposed on the mounting block 360, the contact rod 340 is disposed in the through hole 361, and the rear end of the contact rod 340 penetrates through the through hole 361, so that the contact rod 340 can contact with the contact 510. It can be understood that the through hole 361 is provided with a stop structure for limiting the contact rod 340, so as to prevent the contact rod 340 from being separated from the through hole 361. The stop structure may be, for example, a rib provided on an inner wall of the through-hole 361. The installation block 360 is provided and the through hole 361 is provided on the installation block 360, which is advantageous for the installation and fixation of the feeler lever 340. As shown in FIG. 10, the mounting block 360 may be attached to the trigger body 320 by a screw lock.

With continued reference to fig. 10, in one embodiment, the pin 310 is disposed on a mounting block 360. In other embodiments, the pin 310 may be integrally formed with the trigger body 320.

Fig. 11 is a schematic bottom view of the second embodiment of the toggle button of the present invention, as shown in fig. 11, there are two grooves 410, two grooves 410 are symmetrically arranged to form a C-shaped groove, the holding groove 412 of the left groove 410 extends rightward from the rear end of the start groove 411, and the holding groove 412 of the right groove 410 extends leftward from the rear end of the start groove 411. In the embodiment shown in fig. 11, the trigger 300 can be locked in the open state without providing the stopper, and the pin 310 can be locked by directly using the side wall at the end of the holding groove 412. Specifically, as shown in fig. 11, in the initial state, the guide pin 310 is at a point a, the user presses the toggle button 400 with the thumb in combination with the operation of the index finger on the trigger 300, so that the guide pin 310 moves from the point a to a point b, and the thumb continues to press the guide pin 310 and finally moves to a point c, at which time the guide pin 310 is held in the holding groove 412, so that the unlocking and locking of the switch are realized, and at this time, the whole machine is in the normally open state; that is, the switch will not reset even if the user releases the operating finger.

If the user presses the toggle button 400 with the thumb and operates the trigger 300 with the forefinger to move the guide pin 310 from the point a to the point b, the whole machine is temporarily opened and can be restored to the closed state at any time.

Fig. 12 is a schematic view of a three-dimensional structure of a third embodiment of the middle switch assembly in the first state, as shown in fig. 12, a downward extending limiting post 450 is provided on the toggle 400, a horizontal limiting block 460 is provided at the end of the limiting post 450, and a wedge surface 470 is provided at the rear end of the limiting block 460, wherein the wedge surface 470 is inclined with respect to the moving direction of the toggle button. The trigger 300 is provided with a top pillar 370 extending in the front-rear direction, and two sides of the top pillar 370 are respectively provided with an opening allowing the limiting pillar 450 to enter, as shown in fig. 12 and 13, when the switch assembly 100 is in a locked state, the top pillar 370 abuts against the front end surface of the limiting pillar 450 of the toggle 400, so as to limit the trigger 300 to move backwards; when the switch assembly 100 needs to be turned on, the toggle button 400 is pushed leftwards or rightwards, as shown in fig. 14, the toggle button 400 is pushed leftwards, so that the top pillar 370 is separated from the limiting pillar 450, the limitation on the trigger 300 is removed, and the switch assembly 100 can be turned on by pulling the trigger 300 backwards; then, the toggle 400 is pushed to the left, as shown in fig. 15, a locking hole 371 is formed on the sidewall of the trigger 300 opposite to the limiting block 460, for locking the wedge surface 470 on the limiting column 450 of the toggle 400, so that the switch assembly 100 is in the open holding state.

Fig. 16 is a schematic perspective view of a fourth embodiment of the middle switch assembly of the present invention, and as shown in fig. 16, a hook 480 is disposed on the knob 400, a baffle 380 is disposed on the trigger 300, and the baffle 380 is disposed in front of the hook 480. The front end of the shutter 380 is provided with a first insertion hole 381 and a second insertion hole 382 for allowing the hook 450 to enter, and the first insertion hole 381 and the second insertion hole 382 are used to hold the hook 450 in the open holding state. The dial knob 400 can rotate about a rotation axis parallel to the left-right direction, that is, in the direction indicated by the arrow in fig. 16, and the dial knob 400 can also move in the left-right direction. When the switch assembly 100 is in the locked state, the front end surface of the hook 480 abuts against the baffle 380, so that the trigger 300 cannot move backwards, and the switch assembly 100 cannot be opened when in the locked state; when the switch assembly 100 needs to be opened, the toggle button 400 is rotated in the direction of the arrow shown in fig. 16, so that the hook 480 is disengaged from the groove in the baffle 380, the trigger 300 is unlocked by the toggle button 400, and at this time, the trigger 300 can be pulled backwards, so that the switch assembly 100 is in an opened state; the toggle 400 is then pushed to the left or right so that the hook 480 of the toggle 400 is hooked into the first receptacle 381 on the left side of the trigger 300 or the second receptacle 382 on the right side of the trigger 300, and the switch assembly 100 is in the on hold state.

Fig. 17 to 19 are schematic diagrams illustrating a fifth embodiment of the switch assembly of the present invention, in which a protrusion 490 is formed on the knob 400, and a blocking groove 391 and a blocking wall 392 are sequentially formed on the trigger 300 from front to back. The toggle 400 can rotate about a rotation axis parallel to the left-right direction, that is, in a direction indicated by an arrow in fig. 17. When the switch assembly 100 is in the locked state, as shown in fig. 17, the front end of the projection 490 of the knob 400 abuts against the stopper wall 392 of the trigger 300, so that the trigger 300 is locked and the switch assembly 100 is in the locked state; when it is desired to open the switch assembly 100, the knob 400 is rotated in the direction of the arrow shown in fig. 17 to disengage the protrusion 490 from the stop wall 392 (as shown in fig. 18), the trigger 300 is unlocked, the trigger 300 is pulled backward, and the switch assembly 100 is in an open state; the toggle 400 is released, and the toggle 400 returns to the original position under the action of the torsion spring and is clamped in the catch groove 391, as shown in fig. 19, and the switch assembly 100 is in the open holding state.

It is obvious that the above embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Numerous obvious variations, rearrangements and substitutions will now occur to those skilled in the art without departing from the scope of the invention. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims (13)

1. A switch assembly, comprising:

the switch comprises a contact for controlling the on-off of the switch;

the trigger comprises a transmission unit which can drive the trigger to move so as to trigger or separate from the contact;

the poking button comprises a limiting unit which is matched and connected with the transmission unit, and the limiting unit guides or limits the transmission unit to move;

the limiting unit includes:

a locking position in which the trigger is restricted from moving in a direction to trigger the contact when the transmission unit is in the locking position;

when the transmission unit is located at the opening position, the trigger triggers the contact and can be reset to the locking position at any time;

an open holding position in which the trigger is locked to maintain contact with the contact when the transmission unit is in the open holding position;

and a biasing member that provides a biasing force to the toggle and the trigger to return to the locked position.

2. The switch assembly of claim 1, wherein the open position is located on a path of movement from the locked position to the open hold position.

3. The switch assembly of claim 1, wherein the transmission unit includes a pin disposed on the trigger, and the limiting unit includes a groove disposed on the toggle, the pin being adapted to be inserted into the groove.

4. The switch assembly of claim 3, wherein the recess includes an activation slot and a retention slot in communication with each other, the activation slot intersecting the retention slot.

5. The switch assembly of claim 4, wherein the open position is located in the activation slot and the open retention position is located in the retention slot.

6. The switch assembly of claim 4, wherein the open position is at a location where the retaining slot intersects the activation slot.

7. The switch assembly of claim 4, wherein the recess is an L-shaped recess, and the actuation slot and the retention slot are each two sides of the L-shape.

8. The switch assembly of claim 3, wherein the restraining unit further comprises a restraining rib that restrains the pin in the locked position.

9. The switch assembly according to claim 8, wherein there are two grooves, and the two grooves are symmetrically disposed on both sides of the limiting rib.

10. The switch assembly of claim 1, wherein the biasing force member comprises a first biasing force member and a second biasing force member, the first biasing force member providing a biasing force to the trigger to disengage the contact; the second biasing force member provides the toggle to a biasing force that causes the toggle to be centered in the left-right direction.

11. An electric power tool, characterized by comprising:

a housing;

the working mechanism is arranged in the shell;

the power source provides energy for the working mechanism;

and a switch assembly for controlling the operation of the working mechanism, the switch assembly being as claimed in any one of claims 1 to 10;

the housing includes:

a first mounting hole for mounting the trigger, the trigger being movable in the first mounting hole in a front-rear direction;

the second mounting hole is used for mounting the shifting knob, and the shifting knob can move in the left and right directions in the second mounting hole;

the switch is arranged in the shell.

12. The power tool of claim 11, wherein the power tool is a heat gun, the heat gun further comprising:

the air inlet is arranged on the shell;

the air outlet is arranged at the front end of the shell;

the working mechanism comprises:

the air blowing unit is arranged in the shell and is positioned between the air inlet and the air outlet;

the heating unit is arranged in the shell, is positioned at the upstream of the air outlet and is used for heating the air flow;

the blowing unit and the heating unit are both connected with the switch assembly.

13. The power tool of claim 11, wherein the power tool is a power drill or a power screwdriver, and the working mechanism comprises a motor and an output unit driven by the motor, wherein the motor is connected with the switch assembly, so that the switch assembly controls the motor to be switched on and off.

Images