CN110883738A

CN110883738A - Power tool

Info

Publication number: CN110883738A
Application number: CN201910839668.8A
Authority: CN
Inventors: 付祥青; 陈亮
Original assignee: Chevron HK Ltd
Current assignee: Chevron HK Ltd
Priority date: 2018-09-11
Filing date: 2019-09-06
Publication date: 2020-03-17
Anticipated expiration: 2039-09-06
Also published as: CN110883738B

Abstract

The invention discloses a power tool, comprising: a prime mover; a housing for housing at least part of a prime mover; an output shaft which can be driven by the prime mover and rotates or oscillates about a central axis; a transmission member for transmitting power of the prime mover to the output shaft; a clamping device connected to the output shaft and configured to clamp the work 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 driving member is restricted from being located at the first position and an unlocked state in which the driving member is driven 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 the unlocking state, the output shaft can rotate freely relative to the transmission piece. The power tool is simple in structure and convenient in angle adjustment of the working accessories.

Description

Power tool

Technical Field

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

Background

The power tool such as the swing type generally needs to be provided with a working accessory for sawing and other works, but the connection mode of the working accessory is relatively fixed, and the working mode is single.

The swing-type power tool includes: 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, so that the working accessory can not complete normal work such as sawing and cutting due to dead angle operation when different working conditions are met. At this time, higher requirements are provided for 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 accessories can make adaptive adjustment for the working conditions or not are technical problems to be solved in the field.

Disclosure of Invention

In order to overcome 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 solutions:

a power tool, comprising: a prime mover; a housing for housing at least part of a prime mover; an output shaft which can be driven by the prime mover and rotates or oscillates about a central axis; a transmission member for transmitting power of the prime mover to the output shaft; a clamping device connected to the output shaft and configured to clamp the work 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 driving member is restricted from being located at the first position and an unlocked state in which the driving member is driven 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 the unlocking state, the output shaft can rotate freely relative to the transmission piece.

Further, the locking device includes: the intermediate 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 driving medium includes: a fitting portion; when the intermediate member rotates around the output shaft, the first inclined surface abuts against the matching part so as to drive the transmission member 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 is provided with 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 located 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 plane forms or is connected with the direction muscle, and the third inclined plane is formed with the guide way, and the guide way cooperation direction muscle is in order to transmit the moment of torsion of driving medium to the output shaft.

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

Further, the first operating member has a locking position and an unlocking position; when the first operating piece is positioned at the locking position, the transmission piece is positioned at the first position; when the first operating member is located at the unlocking position, the transmission member is located 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, still include: and the second operating piece is fixedly connected to or formed on the output shaft and 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 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 member is located at the second position, the first tooth portion is separated from the second tooth portion.

The invention has the advantages that: thereby adjust the relation of being connected of output shaft and drive shaft through setting up locking means for the user can the angle of quick adjustment work annex under specific conditions, and guarantee the normal output of power through the relation of being connected of adjustment output shaft and drive shaft once more, this locking means simple structure, user convenient operation.

Drawings

FIG. 1 is a perspective view of a first operating member of the 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 one housing half removed;

FIG. 5 is a plan view of the power output portion of the power tool of FIG. 4;

FIG. 6 is an exploded schematic view of the power output portion of the power tool of FIG. 5;

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

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

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

FIG. 10 is an enlarged view of a transmission of the power tool of FIG. 6

FIG. 11 is an enlarged view of the taper sleeve 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 schematic view from another perspective of the power take off of the power tool of FIG. 12;

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 the present embodiment, the power tool 100 may be specifically an oscillating tool as an example. The power tool 100 may include: a housing 10, a prime mover or drive 12, an output shaft 13, and a working attachment 14, wherein the working attachment 14 may be considered part of the power tool 100 or an attachment external to the power tool 100. For oscillating type tools, the power tool 100 further comprises a transmission for converting the rotation of the prime mover 12 into an oscillation of the output shaft 13. Of course, it will be appreciated that in other embodiments, the output shaft may output power in the form of rotation.

The housing 10 is formed with a containing cavity 11 inside, the prime mover 12 and the transmission are arranged in the containing cavity 11 of the housing 10, the output shaft 13 is at least partially located in the containing cavity 11, and the power tool 100 further comprises 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 respectively mounted inside the housing 10. The portion of the housing 10 surrounding the receiving cavity 11 may also serve as a handle for an operator to hold. 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 the rotation output by the prime mover 12 into a swinging motion 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 present 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 to or formed with: locking means 17, transmission member 18 and clamping means 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 cone 174. Fig. 1 shows a state where the first operation member 171 is located at the lock position, and fig. 3 shows a state where the first operation member 171 is located at the unlock position. When the first operating member 171 is in the unlocked position, the working attachment 14 can rotate freely about the central axis 101, thereby adjusting the angle of the working attachment 14 so that the working attachment 14 can accommodate more operating conditions. Specifically, the operator adjusts the angle of the working attachment 14 by operating the locking device 17 to adjust the connection of the transmission member 18 to the output shaft 13.

As shown in fig. 6 to 7, the power tool 100 is connected to or forms a second operating member 111. For clarity of explanation of the technical solution in the present embodiment, the upper side and the lower side shown in fig. 6 are also defined. The second operating member 111 is fixedly connected to one end of the output shaft 13 and can rotate synchronously 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 manner, so that the taper sleeve 174 can synchronously rotate along with the output shaft 13. And the taper sleeve 174 does not displace relative to the output shaft 13 in the direction along the center axis 101. It is understood that the taper sleeve 174 and the output shaft 13 can be fixedly connected into a whole by other connection methods; alternatively, the taper sleeve 174 is formed directly at a predetermined position of the output shaft 13. The transmission piece 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 transmission element 18 has a first position and a second position relative to the cone 174, and when the transmission element 18 is in the first position relative to the cone 174, the transmission element 18 and the cone 174 are connected and locked to each other, and they can rotate synchronously about the central axis 101. When the driving member 18 is in the second position relative to the cone 174, the driving member 18 and the cone 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, and the other end abuts against the clamping device 19, and the operator operates the first operating member 171 to move the transmission member 18 downwards to bias the elastic member 173 to move to the second position. When the first operating member 171 is operated again to return to the locking position, the elastic member 173 can bias the transmission member 18 to return to the first position. The holding device 19 is fixedly connected to the output shaft 13, and a connecting portion 172d for connecting the working accessory 14 is formed on the holding device 19, and the holding 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 operation member 111 may be, but is not limited to, a knob or other device or accessory that facilitates the rotation operation by the operator. As shown in fig. 8, the first operating member 171 is composed of a fork 171a and a surrounding portion 171b, wherein the fork 171a is moved by an operator to switch the first operating member 171 between the locked state and the unlocked state, the surrounding portion 171b forms an arc segment around the intermediate member 172, and a connecting hole 171c for connecting the intermediate member 172 is formed in the surrounding portion 171 b. The intermediate member 172 is cylindrical and has a through hole penetrating therethrough, and the through hole is configured to be fitted to the output shaft 13. Further, as shown in fig. 9, the intermediate member 172 is also formed with: a first flat surface 172a, a second flat surface 172b, and a first inclined surface 172 c. First plane 172a extends in a plane perpendicular to central axis 101, second plane 172b also extends in a plane perpendicular to central axis 101, first plane 172a and second plane 172b have a height difference in a direction along central axis 101, first inclined plane 172c connects first plane 172a and second plane 172b, and first inclined plane 172c extends in a plane obliquely intersecting central axis 101. The intermediate member 172 is further formed with a connecting portion 172d connected to the first operating member 171 at a position distant from the first inclined surface 172c, and when the connecting portion 172d is inserted into the connecting 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 is understood that the first operating member 171 and the intermediate member 172 can be integrally formed or fixedly connected to form a whole by other connection means; alternatively, the intermediate member 172 may be switched between the locked state and the unlocked state by directly extending the intermediate member 172 without providing the first operating member 171 and forming an operating portion operable by an operator.

As shown in fig. 10, the transmission member 18 is used for transmitting the motive power from the prime mover shaft 121 to the output shaft 13, and includes a main body portion 181 and a swing link 183, the swing link 183 can be driven by the prime mover 12 to swing, so that the swing link 183 drives the output shaft 13 to swing about the central axis 101; the main body 181 is a substantially cylindrical body having a through hole formed therethrough for receiving the taper sleeve 174. The main body 181 further surrounds a protrusion 181b for stopping the elastic member 173, and the elastic member 173 is sleeved on the main body 181 along the central axis 101 and stopped by the protrusion 181b so as not to pass through the main body 181. The main body 181 has an engaging portion 182 at one end, and the engaging portion 182 engages 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 engagement portion 182 of the driving member 18 contacts the first plane 172a, and the driving member 18 is in the first position. When the intermediate member 172 rotates relative to the housing 10 to switch 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 centerline axis, so that the transmission member 18 slides along the central axis 101. Until the intermediate member 172 is in the unlocked state, the second flat surface 172b contacts the engagement portion 182, at which time the transmission member 18 moves to the second position. In the present embodiment, 2 engagement portions 182 are formed for engaging the two first inclined surfaces 172c formed in the intermediate member 172, but it is understood that the engagement portions 182 and the first inclined surfaces 172c are provided in pairs, and that there may be a plurality of pairs of engagement portions 182 and first inclined surfaces 172c, and of course, the number of first inclined surfaces 172c may be smaller than the number of engagement portions 182, but at least one or more first inclined surfaces 172c may be provided for driving the engagement portions 182.

As shown in fig. 11, the taper sleeve 174 is also formed with a through hole passing through itself for being sleeved on the output shaft 13 and fixedly connected with the output shaft 13. Taper sleeve 174 includes a first end 174a and a second end 174b, the first end 174a and second end 174b having different outer diameters in a direction perpendicular to central axis 101, and a second beveled surface 174c connecting first end 174a and second end 174b, second beveled surface 174c extending in a plane obliquely intersecting central axis 101. It will be appreciated that the transmission member 18 forms, through the surface of its through hole, a third inclined surface 181a cooperating 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, and when the second operating member 111 is in the locked state, the guide rib is accommodated in the guide groove, 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 be disposed on the third inclined surface 181a and the guide groove may be disposed on the second inclined surface 174c, and the guide rib and the guide groove cooperate to enhance the transmission of the torque.

In one embodiment of the invention, the cone 174 of the locking device 17 and the transmission element 18 essentially form a clutch mechanism in front of each other. It is understood that in other embodiments, other configurations of the clutch between the locking device 17 and the transmission member 18 may be provided, and will not be described in detail herein.

When the first operating member 171 is in the locking 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, so that 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 working attachment 14 swings about the central axis 101 in the direction in which it is mounted, and when the operator needs to adjust the working attachment 14 to a proper angle according to the requirement of the working condition, the operator pulls the first operating member 171 to place it in the unlocking position. During the process of the user pulling the first operation member 171, the intermediate member 172 rotates in the first rotation 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 the process, the transmission member 18 biases the elastic member 173, the elastic member 173 is charged, the second inclined surface 174c is gradually separated from the third inclined surface 181a until the transmission member 18 is separated from the sleeve, and the transmission member 18 is in the second position. 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 working attachment 14 to a desired angle. When the angular adjustment of the working attachment 14 is completed, the operator pulls the first operating member 171 to the locking position, the intermediate member 172 is returned to the locking state, the transmission member 18 is returned to the first position under the bias of the elastic member 173, and the transmission member 18 can transmit the torque to the output shaft 13, so that the user can operate the power tool 100 to perform the work.

Fig. 12 to 14 show the locking device 21, the transmission member 22, and the clamping device 23 of the power tool 100 in the second embodiment. The power tool has the same clamping 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 locking device 21 includes a first operation member 211, an intermediate member 212, an elastic member 213, and a clutch member 214. The first operation member 211, the intermediate member 212, and the elastic member 213 have the same operation and attachment method as those of the first embodiment. The transmission member 22 includes a main body 221 and a swing link 222, the swing link 222 can be driven by the prime mover to swing, so that the swing link 222 drives the output shaft 24 to swing around the central axis 201; the body portion 221 is substantially a cylinder that defines a through bore 223 therethrough, and the clutch member 214 is disposed within the through bore 223 and is fixedly coupled or integrally formed with the output shaft 24. Drive member 22 has a first position engageable with clutch member 214 and a second position remote from clutch member 214. Specifically, a first tooth portion 224 that engages clutch 214 is formed in through hole 223 of body portion 221. The clutch 214 is formed with a second tooth portion 214a that mates with the first tooth portion 224. The main body 221 further surrounds a protrusion 221a for stopping the elastic member 213, and the elastic member 213 is sleeved on the main body 221 along the central axis 201 and stopped by the protrusion 221a so as not to pass through the main body 221. The main body 221 has an engaging portion connected to or formed at one end thereof, and the engaging portion is engaged with the intermediate member 212 to move the driving member 22 along the central axis 201 with the rotation of the intermediate member 212.

When the first operating member 211 is in the locking position, the transmission member 22 is in the first position, the engaging portion of the transmission member 22 is located on 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 engages with the second tooth portion 214a of the clutch member 214, and the transmission member 22 can transmit power from the prime mover to drive the output shaft 24 to swing about the central axis 201. At this time, the working attachment swings about the central axis 201 in the direction in which the working attachment is mounted, and when the operator needs to adjust the working attachment to a proper angle according to the requirement of the working condition, the operator pulls the first operating member 211 to place the working attachment in the unlocking position. During the process of the user pulling the first operating member 211, the intermediate member 212 rotates in the first rotating direction, and the first inclined surface abuts against the engaging portion of the transmission member 22 and drives the transmission member 22 to move downward. In the process, the transmission member 22 biases the elastic member 213, the elastic member 213 is charged with energy, the second inclined surface and the third inclined surface are gradually separated until the first tooth portion 224 of the transmission member 22 is separated from the second tooth portion 214a of the clutch member 214, and the transmission member 22 is in the second position. 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 working attachment to the desired angle of rotation. After the angle adjustment of the working accessory is completed, the operator pulls the first operating 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 the torque to the output shaft 24, so that the user can operate the power tool to perform the work.

The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It should be understood by those skilled in the art that the above embodiments do not limit the present invention in any way, and all technical solutions obtained by using equivalent alternatives or equivalent variations fall within the scope of the present invention.

Claims

1. A power tool, comprising:

a prime mover;

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

an output shaft that is drivable by the prime mover and that rotates or oscillates about a central axis;

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

a clamping device 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 for limiting the transmission member to be located at the first position and an unlocked state for driving 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 freely rotate relative to the transmission piece.

2. The power tool of claim 1,

the locking device includes:

the intermediate 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 fitting portion;

when the intermediate member rotates around the output shaft, the first inclined surface abuts against the matching part 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,

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 is provided with a third inclined surface with a height difference along the direction of the output shaft;

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

when the transmission member is located at the second position, the second inclined surface is separated from the third inclined surface.

4. The power tool of claim 3,

the transmission member includes:

the swing rod transmits the power of the prime mover;

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

5. The power tool of claim 3,

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

6. The power tool of claim 2,

the locking device includes:

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

7. The power tool of claim 6,

the first operating member 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 operating piece is located at the unlocking position, the transmission piece is located at the second position.

8. The power tool of claim 1,

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.

9. The power tool of claim 1,

further comprising:

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

10. The power tool of claim 1,

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 output shaft to be engaged with the first tooth portion;

when the transmission member is located at the first position, the first tooth part is meshed with the second tooth part;

when the transmission member is located at the second position, the first tooth portion is separated from the second tooth portion.