CN114649154B

CN114649154B - Switch mechanism and electric tool

Info

Publication number: CN114649154B
Application number: CN202011518619.3A
Authority: CN
Inventors: 陈郁
Original assignee: Nanjing Chervon Industry Co Ltd
Current assignee: Nanjing Chervon Industry Co Ltd
Priority date: 2020-12-21
Filing date: 2020-12-21
Publication date: 2023-08-04
Anticipated expiration: 2040-12-21
Also published as: CN114649154A

Abstract

The invention belongs to the technical field of electric tools, and relates to a switching mechanism and an electric tool. The switch mechanism comprises a casing, a switch and a trigger. The housing has a mounting cavity. Both ends of the trigger can be pressed against the casing. The switch mechanism also comprises a limiting piece and an inner driving piece. The limiting piece is arranged in the mounting cavity. The inner driving piece is arranged on one side of the trigger facing the mounting cavity, the inner driving piece can slide relative to the trigger, and two ends of the inner driving piece can be respectively abutted against the switch and the limiting piece. The trigger is provided with a protrusion which abuts against a portion between both ends of the inner driving member, and one end of the trigger is provided with a receiving groove for receiving the inner driving member when the one end of the trigger is pressed. The electric tool comprises the switch mechanism. During assembly, the inner driving part is placed in the accommodating cavity, and then the trigger is connected to the casing. The link of the pivot point alignment and the pivot connection of the inner driving part is omitted, and the assembly process is simplified.

Description

Switch mechanism and electric tool

Technical Field

The invention belongs to the technical field of electric tools, and particularly relates to a switching mechanism and an electric tool.

Background

In order to enable an operator to conveniently operate the switch of the electric tool at different holding positions, an electric tool has been disclosed in which a switch mechanism of the electric tool includes a trigger connected to a housing of the electric tool. The middle part of an inner driving piece is pivoted on the trigger. When the front end of the trigger is pressed, the switch is triggered by the inner driving piece; when the rear end of the trigger is pressed, the switch is directly triggered.

The middle pivot point of the inner drive member and the mating relationship between the two end points and the trigger are considered during manufacture. During assembly, the middle part of the inner driving piece is pivoted on the trigger through the pivoting piece after being pre-installed and aligned. The existing electric tool has the disadvantages of high number of parts, high manufacturing cost and complex assembly.

Disclosure of Invention

It is an object of the present invention to provide a switching mechanism to simplify the assembly process of the switching mechanism.

To achieve the purpose, the invention adopts the following technical scheme:

a switching mechanism, comprising:

a housing having a mounting cavity;

a switch disposed in the mounting cavity;

the trigger is connected with the shell, and both ends of the trigger can be pressed relative to the shell;

the switching mechanism further includes:

the limiting piece is arranged in the mounting cavity;

the inner driving piece is arranged on one side of the trigger facing the mounting cavity, can slide relative to the trigger, and two ends of the inner driving piece can be respectively abutted against the switch and the limiting piece;

the trigger is provided with a protrusion abutting against a portion between both ends of the inner driving member, and one end of the trigger is provided with a receiving groove to receive the inner driving member when the one end of the trigger is pressed.

Preferably, in the above-mentioned switch mechanism, the receiving groove is an arc-shaped groove or a diagonal groove.

Preferably, in the above-mentioned switch mechanism, the inner driving member has a limit projection, and the limit projection is slidably engaged with the receiving groove.

Preferably, in the above-mentioned switch mechanism, a side of the trigger facing the mounting chamber has a receiving chamber, the projection is located in the receiving chamber, and at least part of the inner drive member is located in the receiving chamber.

Preferably, in the above-mentioned switch mechanism, the accommodating groove is surrounded by an inner wall of the accommodating cavity and two ribs provided on the inner wall.

Preferably, in the above-described switch mechanism, the receiving groove is formed by recessing an inner wall of the trigger, or the receiving groove is a through hole provided on the trigger.

Preferably, in the above-described switch mechanism, the inner driving member has a slide groove, and the projection is located in the slide groove.

Preferably, in the above-mentioned switch mechanism, the switch mechanism further includes a lock assembly that locks and unlocks the inner drive member to lock and unlock the trigger.

Preferably, in the above-mentioned switch mechanism, the inner driving member has a lock block having a lock hole, and the lock assembly has a free state away from the lock block, a first lock state abutting against the lock block, and a second lock state in plug-fit with the lock hole.

Another object of the present invention is to provide a power tool to simplify the assembly process of the switching mechanism.

To achieve the purpose, the invention adopts the following technical scheme:

the utility model provides an electric tool, includes power input subassembly, power take off subassembly and foretell switch mechanism, power input subassembly install in the casing, power take off subassembly at least part install in the casing, power input subassembly drive power take off subassembly, the trigger control power input subassembly's opening or closing.

The switch mechanism and the electric tool have the beneficial effects that: when the trigger is assembled, the inner driving piece is only required to be placed on one side of the trigger facing the mounting cavity, the inner driving piece is placed in the accommodating cavity, and then the trigger is connected to the shell. Compared with the prior art, the method omits the link of pivot point alignment and pivot connection of the inner driving part, thereby simplifying the assembly process.

Drawings

FIG. 1 is a state diagram of an embodiment of the present invention when the trigger is not depressed;

FIG. 2 is a cross-sectional view of the switch mechanism of the embodiment of the present invention when the trigger is not depressed;

FIG. 3 is a state diagram of the power tool of the embodiment of the invention when one end of the trigger is pressed;

FIG. 4 is a cross-sectional view of the switch mechanism of the embodiment of the present invention when one end of the trigger is depressed;

FIG. 5 is a state diagram of the electric tool when the other end of the trigger is pressed

FIG. 6 is a cross-sectional view of the switch mechanism of the embodiment of the present invention when the other end of the trigger is depressed;

FIG. 7 is an exploded perspective view of a switch mechanism according to an embodiment of the present invention;

FIG. 8 is a cross-sectional view of the trigger of the switch mechanism of the embodiment of the present invention;

FIG. 9 is a perspective view of the trigger of the switch mechanism of the present invention;

fig. 10 is an assembly view of the inner driving member and the casing of the switch mechanism according to the embodiment of the present invention.

The parts in the figures are named and numbered as follows:

the casing 10, the mounting chamber 11, the stopper 20, the switch 30, the trigger 40, the housing chamber 41, the ribs 42, the protrusions 43, the housing groove 44, the first rotating protrusion 45, the second rotating protrusion 46, the side plate 47, the inner driving member 50, the stopper protrusion 51, the slide groove 52, the lock block 53, the lock hole 531, the lock assembly 60, the lock protrusion 61, the driving mechanism 70, the power output assembly 80, the electric tool 100.

Detailed Description

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

As shown in fig. 1, the present embodiment discloses a power tool 100, which power tool 100 includes a power input assembly, a power output assembly 80, and a switching mechanism, the power input assembly being mounted in a mounting cavity 11 of a housing 10. The power input assembly comprises a motor, a gearbox and other transmission parts. The power take-off assembly 80 is at least partially mounted to the housing 10, the power take-off assembly 80 including a working head. For example, when the power tool 100 is an electric drill, the working head is a drill bit. In other alternative embodiments, the power tool 100 may also be a power hammer, angle grinder, screwdriver, power saw, or the like. The motor drives the power take-off assembly 80 through a transmission.

The switch mechanism includes a trigger 40 connected to the housing 10 and a switch 30 located in the mounting cavity 11. The trigger 40 controls the motor to be turned on or off. As shown in fig. 1 to 6, both ends of the trigger 40 of the present embodiment can be rotated with respect to the casing 10, respectively, and both ends of the trigger 40 can be pressed. Specifically, as shown in fig. 7 and 9, the trigger 40 has a first rotation protrusion 45 and a second rotation protrusion 46 at both ends thereof, respectively, and the first rotation protrusion 45 and the second rotation protrusion 46 are rotatably mounted to the casing 10, respectively. One end of the trigger 40 is rotatable about the first rotation protrusion 45 and the other end is rotatable about the second rotation protrusion 46. Pressing both ends of the trigger 40 can trigger the switch 30 to activate the motor. In other alternative embodiments, the trigger 40 may be slidable relative to the housing 10, in which case depressing the middle of the trigger 40 may also activate the motor.

The power tool 100 of the present embodiment may be hand-held or non-hand-held. For the handheld electric tool 100, the housing 10 is provided with a grip portion for facilitating the operator to grip. To facilitate operator control of the hand-held power tool 100, the trigger 40 is typically positioned at or near the grip.

As shown in fig. 2, 4 and 6, the switch mechanism of the present embodiment further includes a limiting member 20 and an inner driving member 50, the limiting member 20 is disposed in the mounting cavity 11, and the limiting member 20 is connected with the housing 10. The limiting member 20 and the casing 10 may be connected by a connecting member such as a screw, or the limiting member 20 may be integrally formed with the casing 10.

The inner drive member 50 is provided on the side of the trigger 40 facing the mounting cavity 11. The inner driving member 50 of this embodiment may be a metal plate extending along a straight line or a straight plate of other hard material. The inner driving member 50 is slidable relative to the trigger 40, and both ends thereof can be abutted against the switch 30 and the limiting member 20, respectively. The two ends of the inner driving member 50 of the present embodiment are always respectively abutted against the switch 30 and the limiting member 20, which is beneficial to saving space and improving the reliability of the trigger 40. In other alternative embodiments, the ends of the inner drive member 50 may be spaced apart from the switch 30 and the stop member 20, respectively, when the trigger 40 is not depressed.

The trigger 40 is provided with a protrusion 43, the protrusion 43 abutting against a portion between both ends of the inner drive member 50, the inner drive member 50 being in sliding engagement with the protrusion 43. The surface of the protrusion 43 contacting the inner driving member 50 may be an arc surface, that is, the protrusion 43 is preferably an arc surface protrusion 43 to improve the smoothness of sliding between the inner driving member 50 and the protrusion 43. Specifically, the protrusion 43 is provided at a middle position of the trigger 40, and the protrusion 43 abuts against a middle position of the inner drive member 50. The middle position of the inner driving member 50 may specifically be: the center point of the inner driving member 50 extends to both sides by 25% of the range of the total length of the inner driving member 50, respectively.

One end of the trigger 40 is provided with a receiving slot 44 to receive the inner drive member 50 when one end of the trigger 40 is depressed. Specifically, the receiving groove 44 has a length, and when one end of the trigger 40 is pressed, the receiving groove 44 rotates with the one end of the trigger 40, in which process one end of the inner driving member 50 is always located in the receiving groove 44, and one end of the inner driving member 50 is always abutted by the stopper 20.

Based on the above structure, the process of pressing the trigger 40 to trigger the switch 30 is:

as shown in fig. 2 and 4, when one end of the trigger 40 is pressed, the position of the protrusion 43 is closer to the mounting cavity 11 than the original position, and since one end of the inner driving member 50 is always contacted by the limiting member 20, the protrusion 43 drives the inner driving member 50, so that the other end of the inner driving member 50 is tilted towards the switch 30, and the switch 30 is triggered. The home positions here are: the position of the protrusion 43 when the trigger 40 is not depressed.

As shown in fig. 2 and 6, when the other end of the trigger 40 is pressed, the other end of the trigger 40 triggers the switch 30. Since the inner drive member 50 is located between the switch 30 and the trigger 40, it can also be considered that the other end of the trigger 40 pushes the other end of the inner drive member 50 to trigger the switch 30.

Based on the above structure, in the present embodiment, when assembling, only the inner driving member 50 needs to be placed on the side of the trigger 40 facing the mounting cavity 11, the limiting protrusion 51 is aligned with the accommodating groove 44, the inner driving member 50 is placed in the accommodating cavity 41 of the trigger 40, and then the trigger 40 is placed in the mounting cavity 11 and connected to the housing. In fact, because the dimensions of the inner driving member 50 and the receiving cavity 41 are matched, the limit projection 51 is aligned with the receiving groove 44 while the inner driving member 50 is placed in the receiving cavity 41.

Compared with the prior art, the link of the pivot point alignment and the pivot joint of the inner driving piece 50 is omitted, so that the assembly process is simplified, and the problem of failure of the switch caused by the misalignment of the pivot point of the inner driving piece is solved. In addition, the cost of manufacturing the switch mechanism is reduced.

The receiving slot 44 of this embodiment is an arcuate slot having a specific arc and length that is related to the angle of rotation and the rotational travel of one end of the trigger 40. In other alternative embodiments, the receiving slot 44 may be a diagonal slot, where depressing one end of the trigger 40 also causes the other end of the inner drive member 50 to tilt toward the switch 30, triggering the switch 30.

As shown in fig. 7, in correspondence with the accommodating groove, one end of the inner driving member 50 has a limit projection 51, the limit projection 51 extends perpendicular to the length direction of the inner driving member 50, and the limit projection 51 is located in the accommodating groove 44. The receiving groove 44 slides with respect to the limit projection 51 as one end of the trigger 40 moves. The limiting protrusion 51 may be a cylindrical protrusion to improve the smoothness of the relative sliding of the receiving groove 44 and the limiting protrusion 51 and to reduce the abrasion of the limiting protrusion 51. In other alternative embodiments, the stop tab 51 may also be a bulbous structure.

As shown in fig. 8 and 9, in this embodiment, the side of the trigger 40 facing the mounting cavity 11 has a receiving cavity 41, the protrusion 43 is located in the receiving cavity 41, and at least part of the inner drive member 50 is located in the receiving cavity 41. Specifically, the middle portion of the accommodation chamber 41 has a rib, which forms a projection 43 at an end facing the mounting chamber 11. The inner drive member 50 has a certain width, and therefore, the projection 43 extends in the width direction of the inner drive member 50 to reliably abut against the inner drive member 50. Based on this structure, when the inner driving member 50 is assembled, as long as the inner driving member 50 is placed in the accommodating cavity 41, the inner driving member 50 can be abutted by the protrusion 43 and the limiting member 20 and the switch 30, the inner driving member 50 is installed, and the inner driving member 50 is installed more conveniently. In addition, the cost of manufacturing the switch mechanism is further reduced.

In the present embodiment, the accommodating groove 44 is defined by the inner wall of the accommodating chamber 41 and two ribs 42 provided on the inner wall. At this time, the receiving groove 44 can receive both the one end of the inner driving member 50 and the stopper 20 at the same time when the one end of the trigger 40 is pressed.

In other alternative embodiments, the receiving slot 44 is formed by a depression in the inner wall of the trigger 40, or the receiving slot 44 is a through hole provided in the trigger 40. Specifically, as shown in fig. 9, an arc-shaped through hole may be provided on the side plate 47 at one end of the trigger 40 to accommodate the limit projection 51 of the inner drive member 50. At this time, the receiving groove 44 cannot receive the stopper 20 when one end of the trigger 40 is pressed. Therefore, it can be seen that the accommodating groove 44 is surrounded by the inner wall of the accommodating cavity 41 and the two ribs 42 provided on the inner wall, which is beneficial to reducing the occupied space of the switching mechanism.

In this embodiment, as shown in fig. 10, a side of the inner driving member 50 facing away from the mounting cavity 11 is provided with a sliding slot 52, and the protrusion 43 is limited on the sliding slot 52. Specifically, two long sides of the inner driving member 50 are connected with ribs, and the two ribs and the inner driving member 50 enclose a chute 52. The ribs can enhance the strength of the inner drive member 50. In other alternative embodiments, the chute 52 may not be provided, and the inner driving member 50 and the protrusion 43 may still be reliably abutted and slidably engaged due to the inner driving member 50 being retained in the receiving chamber 41.

As shown in fig. 7, the side of the inner driving member 50 facing the mounting cavity 11 is also provided with two ribs, and the two ribs and the inner driving member 50 enclose a groove for accommodating a part of the switch 30, so as to further improve the reliability of driving the switch 30 by the inner driving member 50. The two ribs here further enhance the strength of the inner drive member 50. The ribs on one side of the inner drive member 50 facing the mounting chamber 11 and facing away from the mounting chamber 11 are formed by a plate. The plate is perpendicular to the width direction of the inner drive member 50 and is mounted to the long side of the inner drive member 50. The plate may be integrally formed with the inner drive member 50 or may be attached by welding.

In this application, one end of the inner driving member 50 is near one end of the limiting member 20, and the other end is near one end of the switch 30. One end of the trigger 40 is near the end of the stop 20 and the other end is near the end of the switch 30.

As shown in fig. 7, in the present embodiment, the switch mechanism further includes a lock assembly 60 and a driving mechanism 70, and the lock assembly 60 and the driving mechanism 70 are mounted to the mounting chamber 11 and disposed in the vicinity of the switch 30. Accordingly, a lock button (not shown) for an operator to operate is provided outside the casing 10. For example, the lock button may be disposed adjacent the trigger 40. The locking button is operated to actuate the locking assembly 60 via the drive mechanism 70, thereby causing the locking assembly 60 to lock and unlock the inner drive member 50 to lock and unlock the trigger 40. Further, the inner driving member 50 has a locking block 53, the locking block 53 has a locking hole 531, and the locking assembly 60 has a free state away from the locking block 53, a first locking state abutting against the locking block 53, and a second locking state in plug-fit with the locking hole 531. Specifically, the lock block 53 is provided at one long edge of the inner drive member 50 and is perpendicular to the width direction of the inner drive member 50. The lock hole 531 of the present embodiment is a hole of a combined shape surrounded by a straight line and an arc line. In other alternative embodiments, the locking hole 531 may also be a rectangular hole, a circular hole, or the like.

Specifically, the locking assembly 60 includes a locking protrusion 61, the locking protrusion 61 being engaged with the locking block 53 to have a free state away from the locking block 53, a first locking state abutting the locking block 53, and a second locking state in plug-engagement with the locking hole 531.

When the lock knob is operated so that the lock projection 61 is away from the lock block 53, both ends of the trigger 40 are pressed to activate the motor. After releasing the trigger 40, the trigger 40 is reset under the action of the spring, so that the motor is turned off.

When the lock knob is operated so that the lock projection 61 abuts against the lock block 53, the trigger 40 is made unable to be pressed, and the electric tool 100 is in a safe state of non-operation.

When the locking knob is operated so that the locking protrusion 61 enters the locking hole 531, the motor is in an on state, and at this time, the motor is maintained in an on state after the trigger 40 is released. The operator does not have to press the trigger 40 all the time, and the operation convenience is improved.

It is to be understood that the above examples of the present invention are provided for clarity of illustration only and are not limiting of the embodiments of the present invention. Various obvious changes, rearrangements and substitutions can be made by those skilled in the art without departing from the scope of the invention. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the invention are desired to be protected by the following claims.

Claims

1. A switching mechanism, comprising:

a housing having a mounting cavity;

a switch disposed in the mounting cavity;

the switch mechanism is characterized in that the switch mechanism further comprises:

the limiting piece is arranged in the mounting cavity;

2. The switch mechanism of claim 1, wherein the receiving slot is an arcuate slot or a diagonal slot.

3. The switch mechanism as in claim 1, wherein the inner drive member has a limit projection that is a sliding fit with the receiving slot.

4. The switch mechanism as in claim 1, wherein a side of the trigger facing the mounting cavity has a receiving cavity, the protrusion being located in the receiving cavity, at least a portion of the inner drive member being located in the receiving cavity.

5. The switch mechanism as in claim 4, wherein said receiving groove is defined by an inner wall of said receiving cavity and two ribs provided on said inner wall.

6. The switch mechanism as in claim 4, wherein the receiving groove is formed by a depression of an inner wall of the trigger or the receiving groove is a through hole provided on the trigger.

7. The switch mechanism of claim 1 wherein said inner drive member has a chute, said projection being defined in said chute.

8. The switch mechanism of claim 1, further comprising a locking assembly that locks and unlocks the inner drive member to lock and unlock the trigger.

9. The switch mechanism of claim 8, wherein the inner drive member has a locking block having a locking aperture, the locking assembly having a free state remote from the locking block, a first locked state abutting the locking block, and a second locked state in mating engagement with the locking aperture.

10. An electric tool comprising a power input assembly, a power output assembly and a switch mechanism as claimed in any one of claims 1 to 9, wherein the power input assembly is mounted to the housing, the power output assembly is at least partially mounted to the housing, the power input assembly drives the power output assembly, and the trigger controls the power input assembly to be turned on or off.