CN110883738B

CN110883738B - Power tool

Info

Publication number: CN110883738B
Application number: CN201910839668.8A
Authority: CN
Inventors: 付祥青; 陈亮
Original assignee: Nanjing Chervon Industry Co Ltd
Current assignee: Nanjing Chervon Industry Co Ltd
Priority date: 2018-09-11
Filing date: 2019-09-06
Publication date: 2023-12-15
Anticipated expiration: 2039-09-06
Also published as: CN110883738A

Abstract

The invention discloses a power tool, comprising: a prime mover; a housing for accommodating at least part of the prime mover; the output shaft can be driven by the prime motor and rotates or swings by taking the central axis as an axis; the transmission part is used for transmitting the power of the prime motor to the output shaft; clamping means connected to the output shaft for clamping the working attachment to the power tool; the transmission member has a first position and a second position; the power tool further includes: a locking device having a locked state in which the transmission member is restricted from being located at the first position and an unlocked state in which the transmission member is driven to move to the second position; when the locking device is in a locking state, the output shaft synchronously moves along with the transmission piece; when the locking device is in an unlocking state, the output shaft can rotate freely relative to the transmission piece. The power tool has a simple structure and the angle of the working accessory is convenient to adjust.

Description

Power tool

Technical Field

The invention relates to a power tool, in particular to a swinging type power tool.

Background

Power tools such as swing type tools typically require a work attachment for sawing, but the work attachment is connected in a fixed manner and in a single mode.

The swing type power tool includes: the device comprises a prime motor, a transmission assembly, an output shaft and a clamping device, wherein the transmission assembly drives the output shaft to rotate or swing, and the clamping device is used for clamping the working accessory on the output shaft to synchronously rotate or swing along with the output shaft. However, in the prior art, when the working accessory is mounted on the clamping device, the angle of the working accessory is fixed, and when the working accessory is used for coping with different working conditions, operation dead angles can appear, and the working accessory cannot finish normal sawing and other works. At this time, a higher requirement is put forward on the adaptability of the power tool, how to realize that the power tool meets the working requirements of different working conditions, and whether the working accessory can make adaptive adjustment for the working conditions or not is a technical problem to be solved in the field.

Disclosure of Invention

In order to solve the defects in the prior art, the invention aims to provide a power tool capable of quickly adjusting the angle of a working accessory.

In order to achieve the above object, the present invention adopts the following technical scheme:

a power tool, comprising: a prime mover; a housing for accommodating at least part of the prime mover; the output shaft can be driven by the prime motor and rotates or swings by taking the central axis as an axis; the transmission part is used for transmitting the power of the prime motor to the output shaft; clamping means connected to the output shaft for clamping the working attachment to the power tool; the transmission member has a first position and a second position; the power tool further includes: a locking device having a locked state in which the transmission member is restricted from being located at the first position and an unlocked state in which the transmission member is driven to move to the second position; when the locking device is in a locking state, the output shaft synchronously moves along with the transmission piece; when the locking device is in an unlocking state, the output shaft can rotate freely relative to the transmission piece.

Further, the locking device includes: the middle piece is provided with a first inclined plane with a height difference along the direction of the output shaft and is movably connected to the output shaft; the transmission piece includes: a mating portion; when the intermediate piece rotates around the output shaft, the first inclined surface abuts against the matching part so as to drive the transmission piece to move from the first position to the second position along the output shaft.

Further, the locking device includes: the taper sleeve is provided with a second inclined plane with a height difference along the direction of the output shaft and is fixedly connected to or formed with the output shaft; the transmission part forms a third inclined plane with a height difference along the direction of the output shaft; when the transmission piece is positioned at the first position, the second inclined surface is attached to the third inclined surface; when the transmission piece is positioned at the second position, the second inclined surface is separated from the third inclined surface.

Further, the transmission member includes: the swing rod transmits the power of the prime motor; the main body part is fixedly connected with the swing rod and forms a third inclined plane.

Further, the second inclined surface is formed or connected with a guide rib, and the third inclined surface is formed with a guide groove which is matched with the guide rib to transmit torque of the transmission part to the output shaft.

Further, the locking device includes: the first operating piece is fixedly connected to the middle piece and can be operated to rotate the middle piece.

Further, the first operating member has a locked position and an unlocked position; when the first operating piece is positioned at the locking position, the transmission piece is positioned at a first position; when the first operating piece is positioned at the unlocking position, the transmission piece is positioned at the second position.

Further, the locking device includes: and the elastic piece is used for driving the transmission piece to reset from the second position to the first position.

Further, the method further comprises the following steps: the second operating piece is fixedly connected to or formed on the output shaft and is used for a user to operate and adjust the angle of the working accessory.

Further, the transmission member is formed with a first tooth portion around the output shaft; the locking device includes: a clutch member having a second tooth portion formed along the direction of the output shaft to be engaged with the first tooth portion; when the transmission piece is positioned at the first position, the first tooth part is meshed with the second tooth part; when the transmission piece is positioned at the second position, the first tooth part is separated from the second tooth part.

The invention has the advantages that: the locking device is arranged to adjust the connection relation between the output shaft and the driving shaft, so that a user can quickly adjust the angle of the working accessory under a specific condition, and the normal output of power is ensured by adjusting the connection relation between the output shaft and the driving shaft again.

Drawings

FIG. 1 is a perspective view of a first operator of a power tool in a locked position;

FIG. 2 is a cross-sectional view of the power tool of FIG. 1;

FIG. 3 is a perspective view of the first operating member of the power tool of FIG. 1 in an unlocked position;

FIG. 4 is a plan view of the power tool of FIG. 1 with half of the housing removed;

FIG. 5 is a plan view of the power take-off of the power tool of FIG. 4;

FIG. 6 is an exploded schematic view of the power take-off of the power tool of FIG. 5;

FIG. 7 is an exploded schematic view of another view of the power take-off of the power tool of FIG. 6;

FIG. 8 is an enlarged view of the first operating member and intermediate member of the power tool of FIG. 7;

FIG. 9 is an enlarged view of a portion of the power tool of FIG. 5 at A;

FIG. 10 is an enlarged view of the driving member of the power tool of FIG. 6

FIG. 11 is an enlarged view of the drogue of the power tool of FIG. 7;

fig. 12 is an exploded schematic view of a power output portion of the power tool in the second embodiment;

FIG. 13 is an exploded view of the power take-off of the power tool of FIG. 12 from another perspective;

fig. 14 is a schematic view of the power tool of fig. 12 with the clutch member of the power take-off engaged with the transmission member.

Detailed Description

The power tool 100 shown in fig. 1 to 2 can drive the working attachment 14 to rotate or swing, and in this embodiment, the power tool 100 may be a swing type tool. The power tool 100 may include: the housing 10, the prime mover or drive 12, the output shaft 13 and the working attachment 14, wherein the working attachment 14 may be considered to be part of the power tool 100 or may be considered to be an attachment external to the power tool 100. For a swing-type tool, the power tool 100 further includes a transmission for converting rotation of the prime mover 12 into swing of the output shaft 13. Of course, it will be appreciated that in other embodiments, the output shaft may also output power in the form of rotation.

The housing 10 has a receiving chamber 11 formed therein, the prime mover 12 and the transmission are disposed in the receiving chamber 11 of the housing 10, the output shaft 13 is at least partially disposed in the receiving chamber 11, and the power tool 100 further includes a first bearing 15 and a second bearing 16 for mounting the output shaft 13, wherein the first bearing 15 and the second bearing 16 are mounted inside the housing 10, respectively. The portion of the housing 10 surrounding the receiving chamber 11 may also serve as a handle for the operator to grasp. The prime mover 12 includes a prime mover shaft 121 for driving the output shaft 13 to oscillate about the central axis 101. A transmission is provided between the prime mover shaft 121 and the output shaft 13 for converting rotation output by the prime mover 12 into oscillation of the output shaft 13. For the oscillating tool, the specific structure of the transmission device is well known in the art, and will not be described in detail. In one embodiment of the invention, the prime mover or drive 12 is an electric motor.

As shown in fig. 3 and 5, in the present embodiment, the power tool 100 is connected or formed with: a locking device 17, a transmission member 18 and a clamping device 19. The locking device 17 has a locked state and an unlocked state. The locking device 17 includes: a first operating member 171, an intermediate member 172, an elastic member 173 and a drogue 174. Fig. 1 shows a state where the first operating member 171 is located at the lock position, and fig. 3 shows a state where the first operating member 171 is located at the unlock position. When the first operating member 171 is in the unlocked position, the working attachment 14 is free to rotate about the central axis 101, thereby adjusting the angle of the working attachment 14 such that the working attachment 14 can accommodate more operating conditions. Specifically, the operator adjusts the connection relationship between the transmission member 18 and the output shaft 13 by operating the locking device 17 to achieve angular adjustment of the work attachment 14.

As shown in fig. 6-7, the power tool 100 is coupled to or forms a second operating member 111. For clarity of explanation of the technical solution in this embodiment, the upper side and the lower side shown in fig. 6 are also defined. Wherein the second operating member 111 is fixedly coupled to one end of the output shaft 13 and is capable of synchronously rotating with the output shaft 13. The intermediate member 172 is sleeved on the output shaft 13 and can freely rotate around the output shaft 13. The first operating member 171 is fixedly coupled to the intermediate member 172 for operating the intermediate member 172 for rotation about the output shaft 13. The taper sleeve 174 is sleeved on the output shaft 13 and can be pressed into a whole in an interference fit mode, so that the taper sleeve 174 can synchronously rotate along with the output shaft 13. And in the direction along the central axis 101, the cone sleeve 174 and the output shaft 13 do not generate relative displacement. It will be appreciated that the taper sleeve 174 and the output shaft 13 may be fixedly connected as a whole by other connection means; alternatively, the taper sleeve 174 is formed directly at a predetermined position of the output shaft 13. The transmission member 18 is sleeved on the taper sleeve 174 and can move up and down along the direction of the central axis 101; along the central axis 101, the driving member 18 has a first position relative to the cone sleeve 174 and a second position, and when the driving member 18 is in the first position relative to the cone sleeve 174, the driving member 18 is connected to the cone sleeve 174 and locked to each other, and both can rotate synchronously about the central axis 101. When the driving member 18 is in the second position relative to the drogue 174, the driving member 18 and the drogue 174 are separated from each other and are rotated relative to each other about the central axis 101. The elastic member 173 is sleeved on the transmission member 18, one end of the elastic member abuts against the transmission member 18, the other end abuts against the clamping device 19, and the operator operates the first operating member 171 to move the transmission member 18 downward to bias the elastic member 173 to move to the second position. When the first operating member 171 is again operated to return to the locked position, the resilient member 173 can bias the transmission member 18 to return to the first position. The clamping device 19 is fixedly connected to the output shaft 13, and a connection portion 172d for connecting the working attachment 14 is formed thereon, and the clamping device 19 has various forms, and the specific structure thereof is well known in the art, and will not be described in detail.

The second operating member 111 may be a knob or other device or accessory that facilitates the operator's rotational operation, and is not limited herein. As shown in fig. 8, the first operating member 171 is formed of a fork 171a and a surrounding portion 171b, wherein the fork 171a is adapted to be pushed by an operator to switch the first operating member 171 between the locked state and the unlocked state, the surrounding portion 171b forms a circular arc section around the intermediate member 172, and a connection hole 171c for connecting the intermediate member 172 is further formed in the surrounding portion 171 b. The intermediate member 172 has a cylindrical body and is formed with a through hole penetrating therethrough for being fitted over the output shaft 13. Further, as shown in fig. 9, the middleware 172 is further formed with: a first planar surface 172a, a second planar surface 172b, and a first sloped surface 172c. The first plane 172a extends in a plane perpendicular to the central axis 101, the second plane 172b also extends in a plane perpendicular to the central axis 101, the first plane 172a and the second plane 172b have a height difference in a direction along the central axis 101, the first inclined plane 172c connects the first plane 172a and the second plane 172b, and the first inclined plane 172c extends in a plane obliquely intersecting the central axis 101. The intermediate member 172 is further formed with a connection portion 172d connected to the first operating member 171 at a position distant from the first inclined surface 172c, and when the connection portion 172d is inserted into the connection hole 171c, the first operating member 171 and the intermediate member 172 are connected as a unit and can be rotated synchronously about the center axis 101. It will be appreciated that the first operating member 171 and the intermediate member 172 may be integrally formed or fixedly connected as a single unit by other means of connection; alternatively, the first operating member 171 is not provided, and the intermediate member 172 is directly extended from the intermediate member 172 to form an operating portion operable by the operator, thereby enabling the intermediate member 172 to be switched between the locked state and the unlocked state.

As shown in fig. 10, the transmission member 18 is configured to transmit power from the prime mover shaft 121 to the output shaft 13, and includes a main body 181 and a swing link 183, where the swing link 183 can be driven to swing by the prime mover 12, so that the swing link 183 drives the output shaft 13 to swing about the central axis 101; the body portion 181 is a generally cylindrical body having a through bore formed therethrough for fitting over the taper sleeve 174. The main body portion 181 further includes a protrusion portion 181b formed around the elastic member 173 for stopping the elastic member 173, and the elastic member 173 is sleeved on the main body portion 181 along the direction of the central axis 101 and stopped by the protrusion portion 181b so as not to pass through the main body portion 181. One end of the main body portion 181 is connected to or formed with a mating portion 182, and the mating portion 182 mates with the intermediate member 172 to drive the transmission member 18 to move along the central axis 101 along with the rotation of the intermediate member 172. When the intermediate member 172 is in the locked state, the mating portion 182 of the transmission member 18 contacts the first flat surface 172a, and the transmission member 18 is in the first position. When the rotation of the intermediate member 172 relative to the housing 10 is switched from the locked state to the unlocked state, the first inclined surface 172c contacts the engaging portion 182, and the first inclined surface 172c can drive the engaging portion 182 to slide along the center line axis, so that the transmission member 18 slides along the center axis 101. Until the intermediate member 172 is in the unlocked state, the second flat surface 172b contacts the mating portion 182, at which point the transmission member 18 moves to the second position. In the present embodiment, two first inclined surfaces 172c are formed to match the intermediate member 172, and 2 matching portions 182 are formed, and it is understood that the matching portions 182 are provided in pairs with the first inclined surfaces 172c, and that there may be a plurality of pairs of matching portions 182 and first inclined surfaces 172c, and of course, the number of first inclined surfaces 172c may be smaller than the number of matching portions 182, but at least one or more first inclined surfaces 172c are provided for driving the matching portions 182.

As shown in fig. 11, the taper sleeve 174 is also formed with a through hole penetrating through itself for being sleeved on the output shaft 13 and fixedly connected with the output shaft 13. The drogue 174 includes a first end 174a and a second end 174b, the outer diameters of the first end 174a and the second end 174b being different in a direction perpendicular to the central axis 101, and a second inclined surface 174c connecting the first end 174a and the second end 174b, the second inclined surface 174c extending in a plane obliquely intersecting the central axis 101. It will be appreciated that the surface of the through hole of the transmission member 18 penetrating therethrough forms a third inclined surface 181a which cooperates with the second inclined surface 174c, the third inclined surface 181a extending in a plane obliquely intersecting the central axis 101. When the second inclined surface 174c and the third inclined surface 181a are tightly attached to each other, the transmission member 18 can transmit torque to the taper sleeve 174, so as to drive the output shaft 13 to swing around the central axis 101, and when the second inclined surface 174c and the third inclined surface 181a are separated from each other, the transmission member 18 does not transmit torque to the taper sleeve 174. In order to further improve the reliability of torque transmission, a guide rib is provided on the surface of the second inclined surface 174c, and a guide groove (not shown) is provided on the third inclined surface 181a, in which the guide rib is received when the second operating member 111 is in the locked state, and the transmission of torque is enhanced by the cooperation of the guide rib and the guide groove. It will be appreciated that the guide rib may also be provided on the third inclined surface 181a and the guide groove provided on the second inclined surface 174c, the guide rib and guide groove cooperating to enhance torque transmission.

In one embodiment of the invention, the taper sleeve 174 of the locking device 17 and the transmission 18 substantially form a clutch mechanism. It will be appreciated that in other embodiments, other clutch forms of other structures may be formed between the locking device 17 and the transmission member 18, and will not be described here.

When the first operating member 171 is in the locked position, the transmission member 18 is in the first position, the engaging portion 182 of the transmission member 18 is located on the first plane 172a of the intermediate member 172, and the elastic member 173 has a certain pre-tightening force during assembly, which biases the transmission member 18, so that the transmission member 18 and the taper sleeve 174 are locked with each other, and the transmission member 18 can transmit the power from the prime mover 12 to drive the output shaft 13 to swing about the central axis 101. At this time, the work attachment 14 swings about the center axis 101 in the direction in which it is mounted, and when the operator needs to adjust the work attachment 14 to a proper angle according to the operating condition, the operator pulls the first operating member 171 to be in the unlock position. During the user pulling the first operating member 171, the intermediate member 172 rotates in the first rotational direction, and the first inclined surface 172c abuts against the engaging portion 182 of the transmission member 18 and drives the transmission member 18 to move downward. In this process, the driving member 18 biases the elastic member 173, the elastic member 173 is stored, and the second inclined surface 174c is gradually separated from the third inclined surface 181a until the driving member 18 is separated from the sleeve, and the driving member 18 is in the second position. At this time, the transmission member 18 does not transmit torque to the output shaft 13, and the operator can operate the second operating member 111 to adjust the rotation of the work attachment 14 to a desired angle. When the angle adjustment of the work attachment 14 is completed, the operator pulls the first operating member 171 to the locking position, the intermediate member 172 is reset to the locking state, the transmission member 18 is reset to the first position under the bias of the elastic member 173, at this time, the transmission member 18 can transmit torque to the output shaft 13, and the user can operate the power tool 100 to perform work.

Fig. 12 to 14 show a locking device 21, a transmission 22, and a clamping device 23 of the power tool 100 in the second embodiment. The power tool has the same holding device 23 as in the first embodiment, and only the structure different from that in the first embodiment will be described below. In the present embodiment, the lock device 21 includes a first operation member 211, an intermediate member 212, an elastic member 213, and a clutch member 214. The first operating member 211, the intermediate member 212 and the elastic member 213 have the same function and mounting manner as those of the first embodiment. The transmission member 22 comprises a main body 221 and a swing link 222, and the swing link 222 can be driven to swing by the prime mover, so that the swing link 222 drives the output shaft 24 to swing around the central axis 201; the main body 221 is a substantially cylindrical body having a through hole 223 formed therethrough, and the clutch 214 is disposed in the through hole 223 and fixedly connected or integrally formed with the output shaft 24. The transmission member 22 has a first position in which it can engage the clutch member 214 and a second position away from the clutch member 214. Specifically, the through hole 223 of the main body 221 has a first tooth 224 formed therein, which engages with the clutch 214. The clutch 214 is formed with a second tooth 214a that mates with the first tooth 224. The main body 221 further includes a protrusion 221a formed around the elastic member 213 for stopping the elastic member 213, and the elastic member 213 is sleeved on the main body 221 along the direction of the central axis 201 and stopped by the protrusion 221a so as not to pass through the main body 221. One end of the main body 221 is connected to or formed with a mating portion that mates with the intermediate member 212 to drive the transmission member 22 to move in the direction of the central axis 201 as the intermediate member 212 rotates.

When the first operating member 211 is in the locked position, the transmission member 22 is in the first position, the engaging portion of the transmission member 22 is located in the first plane of the intermediate member 212, and the elastic member 213 has a certain pre-tightening force during assembly, which biases the transmission member 22 such that the first tooth portion 224 of the transmission member 22 is engaged with the second tooth portion 214a of the clutch member 214, and the transmission member 22 can transmit the power from the prime mover to drive the output shaft 24 to swing about the central axis 201. At this time, the work attachment swings about the center axis 201 in the direction in which it is mounted, and when the operator needs to adjust the work attachment to a proper angle according to the working condition, the operator pulls the first operation member 211 to be in the unlock position. In the process that the user pulls the first operation member 211, the intermediate member 212 rotates in the first rotation direction, and the first inclined surface abuts against the mating portion of the transmission member 22 and drives the transmission member 22 to move downward. In this process, the driving member 22 biases the elastic member 213, the elastic member 213 is stored, and the second inclined surface is gradually separated from the third inclined surface until the first tooth 224 of the driving member 22 is separated from the second tooth 214a of the clutch member 214, and the driving member 22 is in the second position. At this point, the transmission member 22 does not transmit torque to the output shaft 24, and the operator can operate the second operating member to adjust the rotation of the work attachment to a desired angle. When the angle adjustment of the work attachment is completed, the operator pulls the first operation member 211 to the locking position, the intermediate member 212 is reset to the locking state, the transmission member 22 is reset to the first position under the bias of the elastic member 213, and at this time, the transmission member 22 can transmit torque to the output shaft 24, and the user can operate the power tool to perform work.

The foregoing has shown and described the basic principles, principal features and advantages of the invention. It will be appreciated by persons skilled in the art that the above embodiments are not intended to limit the invention in any way, and that all technical solutions obtained by means of equivalent substitutions or equivalent transformations fall within the scope of the invention.

Claims

1. A power tool, comprising:

a prime mover;

a housing for accommodating at least part of the prime mover;

the output shaft can be driven by the prime motor and rotates or swings by taking the central axis as an axis;

a transmission member for transmitting power of the prime mover to the output shaft;

clamping means connected to the output shaft for clamping a work attachment to the power tool;

the method is characterized in that:

the transmission member has a first position and a second position;

the power tool further includes:

a locking device having a locked state that restricts the transmission member from being located at the first position and an unlocked state that drives the transmission member to move to the second position;

when the locking device is in a locking state, the output shaft moves synchronously with the transmission piece; when the locking device is in an unlocking state, the output shaft can rotate freely relative to the transmission piece.

2. The power tool of claim 1, wherein the power tool comprises a housing,

the locking device includes:

the middle piece is provided with a first inclined plane with a height difference along the direction of the output shaft and is movably connected to the output shaft;

the transmission member includes:

a mating portion;

when the intermediate member rotates around the output shaft, the first inclined surface abuts against the matching portion so as to drive the transmission member to move from the first position to the second position along the output shaft.

3. The power tool of claim 1, wherein the power tool comprises a housing,

the locking device includes:

the taper sleeve is provided with a second inclined plane with a height difference along the direction of the output shaft and is fixedly connected with or formed with the output shaft;

the transmission part forms a third inclined plane with a height difference along the direction of the output shaft;

when the transmission piece is positioned at the first position, the second inclined surface is attached to the third inclined surface;

when the transmission piece is positioned at the second position, the second inclined surface is separated from the third inclined surface.

4. The power tool of claim 3, wherein the power tool comprises a housing,

the transmission member includes:

the swing rod transmits the power of the prime motor;

the main body part is fixedly connected with the swing rod and forms the third inclined plane.

5. The power tool of claim 3, wherein the power tool comprises a housing,

the second inclined surface is provided with or connected with a guide rib, the third inclined surface is provided with a guide groove, and the guide groove is matched with the guide rib to transmit torque from the transmission part to the output shaft.

6. The power tool of claim 2, wherein the power tool comprises a housing,

the locking device includes:

and the first operating piece is fixedly connected to the middle piece and can be operated to rotate the middle piece.

7. The power tool of claim 6, wherein the power tool further comprises a power source,

the first operating piece has a locking position and an unlocking position;

when the first operating member is located at the locking position, the transmission member is located at the first position;

when the first operation piece is positioned at the unlocking position, the transmission piece is positioned at the second position.

8. The power tool of claim 1, wherein the power tool comprises a housing,

the locking device includes:

and the elastic piece is used for driving the transmission piece to return from the second position to the first position.

9. The power tool of claim 1, wherein the power tool comprises a housing,

further comprises:

and the second operating piece is fixedly connected to or formed on the output shaft and is used for a user to operate and adjust the angle of the working accessory.

10. The power tool of claim 1, wherein the power tool comprises a housing,

the transmission piece is provided with a first tooth part around the output shaft;

the locking device includes:

a clutch member having a second tooth portion formed along the output shaft direction to be engaged with the first tooth portion;

when the transmission piece is positioned at the first position, the first tooth part is meshed with the second tooth part;

when the transmission piece is positioned at the second position, the first tooth part is separated from the second tooth part.