CN107999825B - Power tool and method for mounting working member - Google Patents
Power tool and method for mounting working member Download PDFInfo
- Publication number
- CN107999825B CN107999825B CN201711060146.5A CN201711060146A CN107999825B CN 107999825 B CN107999825 B CN 107999825B CN 201711060146 A CN201711060146 A CN 201711060146A CN 107999825 B CN107999825 B CN 107999825B
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- China
- Prior art keywords
- sleeve
- core
- power tool
- locking
- core body
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- 238000000034 method Methods 0.000 title claims abstract description 20
- 210000000078 claw Anatomy 0.000 claims abstract description 22
- 238000009434 installation Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B45/00—Hand-held or like portable drilling machines, e.g. drill guns; Equipment therefor
- B23B45/02—Hand-held or like portable drilling machines, e.g. drill guns; Equipment therefor driven by electric power
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B51/00—Tools for drilling machines
- B23B51/12—Adapters for drills or chucks; Tapered sleeves
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B51/00—Tools for drilling machines
- B23B51/12—Adapters for drills or chucks; Tapered sleeves
- B23B51/123—Conical reduction sleeves
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Gripping On Spindles (AREA)
Abstract
The present invention relates to a power tool and a working member mounting method, the power tool including: a housing; a motor; a main shaft; the chuck comprises a core body connected with the main shaft, a plurality of clamping claws movably arranged on the core body and an operation sleeve sleeved on the outer side of the core body, wherein the operation sleeve rotates relative to the core body along a first direction to gather the clamping claws so as to lock a working part supported on the core body, and rotates relative to the core body along a second direction to open the clamping claws so as to release the working part supported on the core body; the chuck also comprises a locking assembly, wherein the locking assembly comprises a locking piece which is movably arranged relative to the core body; the operating sleeve is configured to: the locking member can be actuated to move during locking and releasing of the working member to lock the core with the housing. According to the power tool, an operator can drive the locking piece to move to lock the core body relative to the shell only by manipulating the movable operating sleeve, and then the operating sleeve can be rotated in the first direction or the second direction to enable the clamping jaws to be gradually gathered or separated so as to lock or release the working part.
Description
Technical Field
The invention relates to the field of hand-held power tools, in particular to a power tool and a working part installation method.
Background
The hand-held power tool such as an electric drill and the like is widely applied to the production and life of people, and can process different processed parts by changing working parts, so that the hand-held power tool has wide application fields and brings great convenience to the production and life of people.
However, there is currently a common drill chuck with a key that is used to tighten or release the chuck to mount or dismount the working components such as the drill bit. However, since the key exists independently of the power tool, it is easy to lose and the chuck cannot be tightened or released, which brings great inconvenience to the user.
Disclosure of Invention
Accordingly, it is desirable to provide a power tool and a working member mounting method that are simple and convenient to operate without requiring a key to tighten or release a collet, in view of the problem that a key of the power tool is easily lost.
A power tool, comprising:
A housing;
A motor disposed in the housing;
A spindle driven by the motor to output a rotational force; and
The chuck comprises a core body connected with the main shaft, a plurality of clamping claws movably arranged on the core body and an operation sleeve sleeved on the outer side of the core body, wherein the operation sleeve rotates relative to the core body along a first direction to gather the clamping claws so as to lock a working part supported on the core body, and the operation sleeve rotates relative to the core body along a second direction to enable the clamping claws to open so as to release the working part supported on the core body;
the chuck also comprises a locking assembly, wherein the locking assembly comprises a locking piece which is movably arranged relative to the core body; the operating sleeve is configured to: the locking member can be actuated to move during locking and releasing of the working member to lock the core with the housing.
According to the power tool, an operator can drive the locking piece to move to lock the core body relative to the shell only by manipulating the movable operating sleeve, and then the operating sleeve can be rotated along the first direction or the second direction to gradually gather together or separate the plurality of clamping jaws to lock or release the working parts, so that a key is not required to be additionally arranged, and great convenience is brought to the use of the power tool.
In one embodiment, the operating sleeve is operable to drive the locking member from a first position to a second position along the axial direction of the core, the locking assembly allowing relative rotation of the core and the housing when the locking member is in the first position; the locking assembly prevents relative rotation of the core and the housing when the locking member is in the second position.
In one embodiment, the operating sleeve is operable to lock and release a working member supported on the core when the core and the housing are not rotated relative to each other.
In one embodiment, the chuck further comprises a nut disposed between the operating sleeve and the core, the nut threadably engaged with the jaws and driven by the operating sleeve to rotate relative to the core to drive the jaws together and apart.
In one embodiment, the operating sleeve is integrally formed with the nut.
In one embodiment, the power tool further comprises a driving mechanism located between the core and the operating sleeve, the driving mechanism being driven by the operating sleeve to move the locking member.
In one embodiment, the driving mechanism comprises a nut sleeve sleeved on the nut and a driving sleeve sleeved on the nut sleeve, and the driving sleeve can rotate under the drive of the operating sleeve and move along the axis direction of the core body relative to the nut sleeve.
In one embodiment, the drive sleeve is cam-engaged with the nut sleeve.
In one embodiment, the outer side wall of the nut sleeve is convexly provided with a trapezoid block, the trapezoid block is provided with a side edge, the extending direction of the side edge is opposite to the axis direction of the core body, the inner side wall of the driving sleeve is provided with a trapezoid groove extending obliquely from one end edge to the other end, the trapezoid groove is provided with a side groove wall, the extending direction of the side groove wall is parallel to the side edge of the trapezoid block, the trapezoid block is located in the trapezoid groove, and the side edge of the trapezoid block can slide along the side groove wall of the trapezoid groove so that the driving sleeve moves along the axis direction of the core body.
In one embodiment, the outer side wall of the nut sleeve is further provided with a limiting rib in a protruding mode, and the inner side wall of the driving sleeve is provided with a limiting groove matched with the limiting rib so as to limit the limiting rib, so that the driving sleeve can drive the nut sleeve to drive the nut to rotate around the axis direction of the core body to gather together or open the clamping jaw.
In one embodiment, the outer side wall of the driving sleeve is provided with a guide groove extending along the axial direction of the driving sleeve, and the inner side wall of the operating sleeve is provided with a positioning rib matched with the guide groove so as to drive the driving sleeve to rotate around the axial direction of the core body.
In one embodiment, the power tool further comprises a gear box arranged in the shell, a locking part is arranged on the gear box, and the operation sleeve can drive the locking piece to be disconnected from or connected with the locking part.
In one embodiment, the locking assembly further comprises a guide member fixedly arranged relative to the core body, and an elastic reset member arranged between the guide member and the locking member, wherein the elastic reset member can provide thrust force for the locking member towards the direction of the operation sleeve.
A method of operating a locking working element for a power tool according to claim 1, comprising the steps of:
inserting the working part on the core;
and rotating the operating sleeve to enable the core body to be in a locking state.
In one embodiment, after the core is in the locked state, the method further comprises the following steps:
and rotating the operation sleeve to gather the clamping jaws on the core body so as to clamp the working part.
Drawings
FIG. 1 is a schematic diagram of a power tool according to an embodiment;
FIG. 2 is a cross-sectional view of the power tool shown in FIG. 1;
FIG. 3 is a schematic view of a portion of the power tool of FIG. 1;
FIG. 4 is an exploded view of the power tool shown in FIG. 3;
FIG. 5 is a schematic view of the structure of the mounting plate of the power tool shown in FIG. 4;
FIG. 6 is a cross-sectional view of the power tool of FIG. 1 with the core unlocked;
FIG. 7 is a cross-sectional view of the power tool of FIG. 1 with the core locked;
FIG. 8 is a schematic diagram of the working principle of the power tool of FIG. 1 when the core is unlocked;
FIG. 9 is a schematic diagram of the core of the power tool of FIG. 1 in operation;
FIG. 10 is a force analysis chart of the power tool of FIG. 9;
FIG. 11 is a schematic view of the locking assembly of the power tool of FIG. 1 without overlapping the jaws;
FIG. 12 is a schematic view of the power tool of FIG. 1 with the locking assembly partially overlapping the pawl;
FIG. 13 is an exploded view of the core of the power tool of the second embodiment when not locked;
FIG. 14 is a cross-sectional view of the power tool of FIG. 13 with the core unlocked;
FIG. 15 is a cross-sectional view of the power tool of FIG. 13 with the core locked;
FIG. 16 is an exploded view of the power tool of the third embodiment;
FIG. 17 is a cross-sectional view of the power tool of FIG. 16 with the core unlocked;
FIG. 18 is another cross-sectional view of the core of the power tool of FIG. 16 shown unlocked;
FIG. 19 is a cross-sectional view of the power tool of FIG. 16 with the core locked;
FIG. 20 is another cross-sectional view of the core of the power tool of FIG. 1 as locked;
fig. 21 is a flowchart of a working part mounting method of an embodiment.
Detailed Description
In order that the invention may be readily understood, a more complete description of the invention will be rendered by reference to the appended drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "fixed to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like are used herein for illustrative purposes only.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
As shown in fig. 1,2 and 3, a power tool 100 according to the first embodiment includes a tool body and a chuck 20 connected to the tool body, wherein the tool body includes a housing 10, a motor 14 disposed in the housing 10, and a spindle 40 indirectly connected to the motor 14 and driven by the motor 14 to output a rotational force, and the chuck 20 is connected to the housing 10 for releasably locking a working member, such as a drill bit, and then performing various working operations on a workpiece under the driving of the motor 14.
As shown in fig. 4, 6 and 7, the power tool 100 includes a gear case 12 provided in a housing 10, and a motor 14 outputs a rotational force to a spindle 40 through the gear case 12.
The collet 20 includes a core 21, jaws 22, and an operating sleeve 23. The core 21 is fixedly connected to the spindle 40 by threads and back pressure screws, and the plurality of claws 22 are movably disposed in the core 21. The operating sleeve 23 is sleeved outside the core 21, and the operating sleeve 23 is operable to drive the claw 22 to move relative to the core 21, so as to lock or release the working member supported on the core 21. Specifically, rotation of the operating sleeve 23 relative to the core 21 in a first direction brings the jaws 22 together to lock the working member supported on the core 21, and rotation of the operating sleeve 23 relative to the core 21 in a second direction brings the jaws 22 open to release the working member supported on the core 21.
As shown in fig. 2, 4,6 and 7, the collet 20 further includes a locking assembly 24 located inside the operating sleeve 23 and between the operating sleeve 23 and the core 21, the locking assembly 24 including a locking member 242 movably disposed with respect to the core 21, the operating sleeve 23 being configured to: the locking piece 242 can be driven to move during locking and releasing of the working member to lock the core 21 with the housing 10. The operating sleeve 23 is operable to lock and release the working member supported by the core 21 when the core 21 and the housing 10 are not rotated relative to each other.
Specifically, the operating sleeve 23 operatively drives the locking piece 242 to move from the first position to the second position in the axial direction of the core 21. When the locking member 242 is in the first position, the locking assembly 24 allows the core 21 to rotate relative to the housing 10; when the locking assembly 22 is in the second position, the position of the core 21 relative to the housing 10 is locked against relative rotation, and the locking assembly 24 prevents relative rotation of the core 21 and the housing 10 to lock the core 21 and the housing 10.
In the power tool 100, an operator can drive the locking member 242 to move to lock the core 21 relative to the housing 10 only by manipulating the moving operating sleeve 23, and further can rotate the operating sleeve 23 along the first direction or the second direction to gradually gather or separate the plurality of claws 22 to lock or release the working parts, so that no additional key is required, and great convenience is brought to the use of the power tool 100.
With continued reference to fig. 2,4, 6 and 7, the collet 20 further includes a nut 26 disposed between the operating sleeve 23 and the core 21. The nut 26 is threadedly engaged with the jaws 22 and is driven by the operating sleeve 23 to rotate relative to the core 21 to drive the jaws 22 together and apart.
The power tool 100 further includes a driving mechanism 25 between the core 21 and the operating sleeve 23, the driving mechanism 25 being driven by the operating sleeve 23 to move the locking member 242. When the locking member 242 is located at the first position, the operating sleeve 23 is rotated, and the driving mechanism 25 can drive the locking member 242 to move to the second position under the action of the operating sleeve 23, so as to convert the rotation of the operating sleeve 23 into the axial linear motion of the locking member 242. When the locking assembly 22 is in the second position, the operating sleeve 23 can rotate the nut 26 about the axis of the core 21 via the drive mechanism 25 to drive the jaws 22 to release or lock the working element.
Specifically, the driving mechanism 25 includes a nut housing 252 sleeved on the nut 26 and a driving housing 254 sleeved on the nut housing 252. When the locking member 222 is in the first position, the driving sleeve 254 is driven by the operating sleeve 23 to rotate and move along the axial direction of the core 21 relative to the nut sleeve 252, so as to convert the rotation of the operating sleeve 23 into the axial linear movement of the locking member 242. When the locking member 242 is in the second position, the operating sleeve 23 can rotate the nut 26 about the axis of the core 21 via the driving mechanism 25 to drive the jaws 22 to release or lock the working element. In another embodiment, the operating sleeve 23 can move linearly along the axial direction of the core 21, and the driving sleeve 254 is fixedly connected with the operating sleeve 23, so as to directly drive the driving sleeve 254 to move along the axial direction of the core 21.
In this embodiment, further, the driving sleeve 254 is cam-engaged with the nut sleeve 252, so that the rotation of the operating sleeve 23 is converted into the axial rectilinear motion while the driving sleeve 254 rotates about the axis of the core 21 under the action of the nut sleeve 252.
Specifically, the nut sleeve 252 is interference-fitted with the nut 26 to be fixed to the nut 26, and a plurality of trapezoidal blocks 2522 are provided on the outer side wall of the nut sleeve 252 in a protruding manner in the circumferential direction, and the trapezoidal blocks 2522 are provided with side edges extending in a direction intersecting the axial direction of the core 21. The inner side wall of the driving sleeve 254 is provided with a trapezoid groove 2542 extending obliquely from one end edge to the other end, the trapezoid groove 2542 is provided with a side groove wall with the extending direction parallel to the side edge of the trapezoid block 2522, and the trapezoid block 2522 is located in the trapezoid groove 2542 and can slide along the side edge of the trapezoid groove 2542 so as to drive the driving sleeve 254 to move along the axis direction of the core 21. More specifically, the trapezoidal recess 2542 is generally isosceles trapezoid, with the bottom edge of the trapezoidal recess 2542 being located at the end of the drive sleeve 254 remote from the locking assembly, and the side walls of the trapezoidal recess 2542 being disposed obliquely to either side of the bottom edge. The trapezoidal block 2522 is generally isosceles triangle shaped similar in shape to the trapezoidal groove 2542 and smaller in size than the trapezoidal groove 2542. The side edges of the trapezoidal block 2522 are two opposite hypotenuses of an isosceles triangle.
In particular, in the present embodiment, as shown in fig. 8 to 10, q=t/(r× (tan (α+Φ)). Where T is the force exerted by the operating sleeve 23 on the side groove wall of the trapezoidal groove 2542, Q is the force exerted by the locking assembly 22 on the driving sleeve 254, α is the angle formed by the side groove wall of the trapezoidal groove 2542 and the axial direction of the core 21, Φ is the friction angle between the side edge of the trapezoidal block 2522 and the side groove wall of the trapezoidal groove 2542, r is the outer radius length of the driving sleeve 254, and F R is the reaction force of the side edge of the trapezoidal block 2522 of the nut sleeve 252 to the driving sleeve 254. In this way, the driving sleeve 254 rotates under the driving of the operating sleeve 23 and moves in the axial direction of the core 21 under the action of the nut sleeve 252 to push the locking member 22 to move in the axial direction of the core 21, and finally lock the core 21.
With continued reference to fig. 2,4,6 and 7, the outer side wall of the nut sleeve 252 is further provided with a protruding limit rib 2524, and the inner side wall of the driving sleeve 254 is provided with a limit groove matched with the limit rib 2524 to limit the limit rib 2524, so that after the core 21 is fixed to the housing 10, the nut sleeve 252 is made to rotate along with the driving sleeve 254, and the driving sleeve 254 can drive the nut sleeve 252 to drive the nut 26 to rotate around the axis direction of the core 21 so as to drive the claw 22 to release or lock the working part.
In this way, the driving sleeve 254 can rotate within a certain range relative to the nut sleeve 252, and moves along the axial direction of the core 21 under the cooperation of the trapezoidal block 2522 and the trapezoidal groove 2542, so that the core 21 is locked to the housing 10. When the driving sleeve 254 rotates to a certain position relative to the nut sleeve 252 and causes the core 21 to be locked on the housing 10, the limiting rib 2524 abuts against the edge of the limiting groove, so that the driving sleeve 254 drives the nut sleeve 252 to rotate synchronously, and the driving sleeve 254 can be continuously rotated to drive the nut sleeve 252 to rotate relative to the core 21, and finally the nut 26 is driven to rotate to screw the nut 26, thereby achieving the purpose that the claw 22 clamps the working part (as shown in fig. 5).
The outer side wall of the driving sleeve 254 is provided with a guide groove 2544 extending along the axial direction of the driving sleeve 254, and the inner side wall of the operating sleeve 23 is provided with a positioning rib matched with the guide groove 2544 so as to drive the driving sleeve 23 to rotate around the axial direction of the core 21 and slide relative to the operating sleeve 23 along the axial direction of the core 21. Thus, the operator rotates the operating sleeve 23 to drive the driving sleeve 254 to axially rotate, and the driving sleeve 254 is engaged with the nut sleeve 252 sleeved on the core 21, so that the driving sleeve 254 can move along the axial direction of the core 21 under the action of the nut sleeve 252. When the driving sleeve 254 cannot move axially, the nut sleeve 252 is driven to rotate by the operating sleeve 23 through the driving sleeve 254, so that the operating sleeve 23 drives the claw 22 to release or lock the working part.
The power tool 100 further includes a gear case 12 disposed within the housing 10, the gear case 12 having a locking portion 122 disposed thereon, and the operating sleeve 23 being configured to drive the locking member 242 out of engagement with or into engagement with the locking portion 122. Specifically, when the locking piece 242 is located at the first position, the locking piece 242 is disengaged from the locking portion 122, and when the locking piece 242 is located at the second position, the locking piece 242 is engaged with the locking portion 122.
Specifically, the locking portion 122 is provided with a recess 1222, and the locking element 242 includes a pin that engages the recess. Thus, when the locking piece 242 is in the first position, the pin is disengaged from the groove 1222, and when the locking piece 242 is in the second position, the locking piece 242 is engaged with the locking portion 122, thereby achieving locking of the core 21.
Further, as shown in fig. 5, the locking assembly 22 further includes a fixing plate 244, and a locking member mounting hole 2446 matched with the pin shafts is formed on the fixing plate 244 along the circumferential direction, and each pin shaft is respectively inserted into one locking member mounting hole 2446. Thus, the operating sleeve 23 can drive the fixing plate 244 to gradually approach the housing 10 along the axial direction of the core 21, and finally the locking member 222 is inserted into the groove 1222 to be circumferentially fixed relative to the housing 10.
The locking assembly 24 further includes a guide 246 fixedly disposed relative to the core 21, the guide 246 being located on a side of the locking assembly 22 adjacent the spacing structure. The end surface of the guide plate 26 is provided with a guide hole 2462, and when the locking piece 242 is located at the second position, the locking piece 242 passes through the guide hole 246 to be matched with the locking part 122. The guide holes 246 include a plurality of guide holes 2462 circumferentially distributed along the guide member 246, and the locking members 242 are in one-to-one correspondence with the guide holes 246.
Specifically, the inner side wall of the smaller diameter end of the guide plate 246 is provided with a positioning rib along the axial direction, the outer side wall of one end of the core 21 is provided with a core positioning groove in interference fit with the positioning rib, and the positioning rib can be clamped in the core positioning groove to fixedly connect the guide plate 246 to one end of the core 21. The end surface of the other end of the guide plate 246 having a larger diameter is provided with guide holes 262 corresponding to the locking piece mounting holes 2446 of the fixing plate 244 at intervals in the circumferential direction, and the locking pieces 242 of the fixing plate 244 can be coupled with the locking portions 122 through the guide holes 262, thereby locking the core 21 with respect to the housing 10.
The locking assembly 20 further comprises an elastic restoring member 248 disposed between the guide member 246 and the locking member 242, the elastic restoring member 248 can generate recoverable deformation in the axial direction of the core 21, the locking member 242 can move from the first position to the second position against the elastic force of the elastic restoring member 248 under the action of the operating sleeve 23, and the elastic restoring member 248 can move the locking member 222 from the second position to the first position, so that the locking member 222 is separated from the locking portion 122, and the core 21 is released, so that the spindle 40 can drive the core 21 to rotate.
Specifically, the resilient return member 248 includes a plurality of springs that are circumferentially distributed along the guide member 246.
As shown in fig. 11 and 12, in one embodiment, the locking assembly 24 at least partially overlaps the travel of the jaws 22 in the axial direction of the core 21, thereby reducing the overall length of the power tool 100.
Specifically, a receiving space is formed between the fixing plate 244 of the locking assembly 24 and the guide member 246, and a receiving groove 2442 (as shown in fig. 3) communicating with the receiving space is formed on the fixing plate 244, and one end of the claw 22 near the housing 10 can extend into or pass through the receiving groove 2442. In this way, one end of the claw 22 overlaps the lock assembly 22 in the axial direction of the core 21, so that the volume of the power tool 100 can be further reduced.
The power tool 100 is provided with the drill chuck 20 integrated with the core 21 to be locked when the working member is mounted, without providing an additional locking means on the gear case 40, thereby having a small length to be convenient to carry and use. In addition, the operating sleeve 23 is only required to be held when the working parts are installed, so that the user is prevented from being injured due to misoperation, and the installation operation of the working parts is simplified without operating a plurality of parts, thereby bringing convenience to the operator.
As shown in fig. 12 to 15, the second embodiment of the present invention has a similar structure to that of the first embodiment, and the same structure is denoted by a uniform number, and will not be described again. The difference from the first embodiment is that in the second embodiment, the elastic restoring member 27 is sleeved on the core 21, and two ends of the elastic restoring member 27 respectively abut against the operating sleeve 23 and the core 21.
Specifically, the elastic restoring member 27 is a spring sleeved at one end of the core 21 far away from the housing 10, when the working component is clamped, the rotating operation sleeve 23 drives the driving sleeve 254 fixedly connected with the working component to rotate, when the torque force of the rotating operation sleeve 23 reaches a preset value, the driving sleeve 254 continues to rotate, the driving sleeve 254 moves along the axial direction of the core 21 under the action of the nut sleeve 252 matched with the cam of the driving sleeve 254, and the fixing plate 224 is driven to move axially, so that the locking member 222 on the fixing plate is limited on the housing 10. At the same time, the operating sleeve 23 engaged with the driving sleeve 254 also moves in the axial direction of the core 21 toward the housing 10, compressing the elastic restoring member 27. After the clamping of the working parts is completed, the operator can loosen the operation sleeve 23, so that the elastic reset piece 27 drives the fixing plate 224 to move and reset in a direction away from the shell 10, and meanwhile, the driving sleeve 254 rotates and moves in a direction away from the shell 10 under the action of the nut sleeve 252 matched with the driving sleeve 254, so that the locking piece 222 on the fixing plate 224 is driven to be separated from the shell 10. It will be appreciated that the working member removal process is also similar to the working member clamping process described above, with only a difference in the direction of rotation of the operating sleeve 23.
In this embodiment, the chuck 20 further includes a rear cover 29, and the rear cover 29 is covered on a side of the core 21 close to the housing 10.
As shown in fig. 16 and 17, the third embodiment of the present invention has a similar structure to that of the first embodiment, wherein the same structure is denoted by a uniform number, and a description thereof is omitted. The difference from the first embodiment is that in the second embodiment, the locking member 242 is integrally formed with the fixing plate 224, and the locking member 242 protrudes from a side of the fixing plate 224 near the housing 10.
In the present embodiment, when the locking member 242 abuts against the housing 10, the driving sleeve 254 abuts against the fixing plate 224 and cannot move further along the axial direction of the core 21 toward the housing 10, so as to drive the nut sleeve 252 to rotate around the axis of the core 21, thereby finally driving the nut 26 to rotate to lock or release the pawl 22.
As shown in fig. 16, in the power tool 100 mounted with the chuck 20 in the third embodiment, the locking portion 122 includes the clutch plate 14 disposed on the end face of the housing 10 near the chuck 20, the clutch plate 14 is provided with a plurality of protrusions 1224 with sidewalls inclined with respect to the axis of the spindle 40, the plurality of protrusions 1224 are spaced apart, and one end of the locking member 222 near the clutch plate 14 can be abutted between two adjacent protrusions 1224 and slide along the edges of the protrusions 1224 to separate from the clutch plate 14. Thus, after the locking piece 222 abuts against the two protrusions 1224 to lock the core 21, the core 21 can be released along with the continued rotation of the spindle 40 and the release plate 14, so as to avoid the locked rotation of the spindle 40 fixedly connected with the core 21, which results in the locked rotation of the motor.
Specifically, referring to fig. 17 and 18, when the working head is automatically mounted using the power tool 100, the operator holds the operating sleeve 23 with one hand and can turn on the power tool 100 with the other hand. At this time, the core 21 is driven by the spindle 40 to drive the nut sleeve 252 to rotate, so as to drive the driving sleeve 254 to move along the axis direction of the core 21, thereby pushing the locking member 222 to insert into the housing 10, and forming a clutch structure with a clutch plate on the housing 10, so as to lock the core 21 (as shown in fig. 19 and 20).
As the spindle 40 rotates, the operator holds the operating sleeve 23 to make the operating sleeve 23 stationary relative to the housing 10, and the relatively stationary operating sleeve 23 makes the nut 26 also stationary relative to the housing 10 through the driving sleeve 254 and the nut sleeve 252, so that the claws 22 rotating relative to the nut 26 following the spindle 40 gradually approach toward the middle to fit the working member.
As the spindle 40 continues to rotate, the torque force applied to the hand holding the operating sleeve 23 by the operator increases gradually, and when the torque force reaches a certain value, the nut sleeve 252 cam-engaged with the driving sleeve 254 rotates under the action of the core 21, so as to drive the driving sleeve 254 to move toward the housing 10, and further push the fixing plate 224 to compress the restoring member 28, so that the locking member 222 on the fixing plate 224 is inserted between the two protrusions 142 on the clutch plate 14. At this point, the spindle 40 continues to rotate, and the inclined surfaces of the locking member 222 and the protrusion 142 generate an increasing axial force that pushes the locking member 222 to slide along the inclined surfaces and gradually move away from the clutch plate 14, and pushes the driving sleeve 254 to move away from the housing 10.
As the spindle 40 continues to rotate, the locking member 222 rotates between the other two protrusions 142 on the clutch plate 14 to re-contact the clutch plate 14. Thus, as the spindle 40 rotates, the locking member 222 repeatedly contacts and disengages from the clutch plate 14 until the operator fails to bear the torque force and gives up to hold the operating sleeve 23, at this time, the locking member 222 is disengaged from the clutch plate 14 under the action of the resetting member 28 and moves in a direction away from the housing 10, and drives the driving sleeve 254 to move in a direction away from the housing 10 and rotate circumferentially, so that the core 21 with the mounted working components can rotate relative to the housing 10 and work normally.
The power tool 100 is provided with the chuck 20 integrated with the core 21 to be locked when the working member is mounted, without providing an additional locking means on the housing 10, thereby having a small length to be convenient to carry and use. In addition, the operating sleeve 23 is only required to be held when the working parts are installed, so that the user is prevented from being injured due to misoperation, and the installation operation of the working parts is simplified without operating a plurality of parts, thereby bringing convenience to the operator.
As shown in fig. 21, a working member mounting method of a preferred embodiment. The method comprises the following steps:
S110: the working member is inserted into the core 21.
Specifically, the core 21 is provided with claws 22 that can gather together or separate from each other, and when the claws 22 are in a state of being separated from each other, the working parts can be inserted between the claws 22, so as to realize the pre-installation of the working parts.
S120: the operating sleeve 23 is turned to put the core 21 in a locked state.
Specifically, rotating the operating sleeve 23 may drive the locking member 222 to move and lock with respect to the housing 10, thereby locking the core 21.
Further, when the core 21 is in the locked state, the method further comprises the steps of:
S130: the operating sleeve 23 is turned to bring the jaws 22 on the core 21 together to grip the working element.
Specifically, after the core 21 is locked to the housing 10, the operator can continue to rotate the operating sleeve 23, thereby driving the driving nut 26 to rotate around the axis direction of the core 21 relative to the core 21 to gather the claws 22, and finally clamp the working member.
According to the working part installation method, in the clamping process, an operator can lock the core 21 and clamp the working part by only rotating the operating sleeve 23 all the time without operating other parts, so that the installation efficiency of the working part is improved, and great convenience is brought to the operator. It will be appreciated that the method of removing the working element is similar to the method of mounting described above, with only a difference in the orientation of the operating sleeve 23. Therefore, when the working member is detached, the release of the core 21 and the detachment of the working member can be achieved only by the operating sleeve 23.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (14)
1. A power tool, comprising:
A housing;
A motor disposed in the housing;
A spindle driven by the motor to output a rotational force; and
The chuck comprises a core body connected with a main shaft, a plurality of clamping claws movably arranged on the core body and an operation sleeve sleeved on the outer side of the core body, wherein the operation sleeve is rotated by an operator in a first direction relative to the core body to gather the clamping claws so as to lock a working part supported on the core body, and the operation sleeve is rotated by the operator in a second direction relative to the core body to open the clamping claws so as to release the working part supported on the core body;
the chuck is characterized by further comprising a locking assembly, wherein the locking assembly comprises a locking piece movably arranged relative to the core body, and the locking assembly at least partially overlaps with the moving stroke of the clamping jaw along the axis direction of the core body; the operating sleeve is configured to: movement of the operating sleeve by an operator can actuate movement of the locking member to lock the core with the housing.
2. The power tool of claim 1, wherein the operating sleeve is operable to drive the locking member from a first position to a second position along the axial direction of the core, the locking assembly allowing relative rotation of the core and the housing when the locking member is in the first position; the locking assembly prevents relative rotation of the core and the housing when the locking member is in the second position.
3. The power tool of claim 2, wherein the operating sleeve is operable to lock and release the working member supported on the core when there is no relative rotation between the core and the housing.
4. The power tool of claim 1, wherein the collet further comprises a nut disposed between the operating sleeve and the core, the nut threadably engaged with the jaws and driven in rotation relative to the core by the operating sleeve to drive the jaws together and apart.
5. The power tool of claim 4, further comprising a drive mechanism between the core and the operating sleeve, the drive mechanism driven by the operating sleeve to move the locking member.
6. The power tool according to claim 5, wherein the driving mechanism comprises a nut sleeve sleeved on the nut and a driving sleeve sleeved on the nut sleeve, and the driving sleeve can rotate under the drive of the operating sleeve and move along the axis direction of the core body relative to the nut sleeve.
7. The power tool of claim 6, wherein the drive sleeve is cam-engaged with the nut sleeve.
8. The power tool according to claim 7, wherein an outer side wall of the nut housing is convexly provided with a trapezoidal block provided with a side edge extending in a direction intersecting an axial direction of the core, an inner side wall of the driving housing is provided with a trapezoidal groove extending obliquely from one end edge to the other end, the trapezoidal groove is provided with a side groove wall extending in a direction parallel to the side edge of the trapezoidal block, the trapezoidal block is located in the trapezoidal groove, and the side edge of the trapezoidal block is slidable along the side groove wall of the trapezoidal groove to move the driving housing in the axial direction of the core.
9. The power tool according to claim 8, wherein the outer side wall of the nut sleeve is further provided with a limiting rib in a protruding manner, and the inner side wall of the driving sleeve is provided with a limiting groove matched with the limiting rib to limit the limiting rib, so that the driving sleeve can drive the nut sleeve to drive the nut to rotate around the axis direction of the core body to gather or spread the clamping jaw.
10. The power tool according to claim 9, wherein the outer side wall of the driving sleeve is provided with a guide groove extending along the axial direction of the driving sleeve, and the inner side wall of the operating sleeve is provided with a positioning rib matched with the guide groove so as to drive the driving sleeve to rotate around the axial direction of the core body.
11. The power tool of claim 1, further comprising a gear box disposed within the housing, the gear box having a locking portion disposed thereon, the operating sleeve being operable to drive the locking member out of engagement with or into engagement with the locking portion.
12. The power tool of claim 1, wherein the locking assembly further comprises a guide member fixedly disposed relative to the core, and a resilient return member disposed between the guide member and the locking member, the resilient return member providing a pushing force to the locking member in a direction toward the operating sleeve.
13. A method of operating a locking working element for a power tool as claimed in claim 1, comprising the steps of:
inserting the working part on the core;
and rotating the operating sleeve to enable the core body to be in a locking state.
14. The method of operating a locking working element of claim 13, further comprising the steps of, when the core is in the locked state:
and rotating the operation sleeve to gather the clamping jaws on the core body so as to clamp the working part.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
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| CN201610940217 | 2016-11-01 | ||
| CN201610940217X | 2016-11-01 |
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| CN107999825A CN107999825A (en) | 2018-05-08 |
| CN107999825B true CN107999825B (en) | 2024-06-14 |
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| CN201711060146.5A Active CN107999825B (en) | 2016-11-01 | 2017-11-01 | Power tool and method for mounting working member |
| CN201721440648.6U Active CN207547698U (en) | 2016-11-01 | 2017-11-01 | Power tool |
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| CN207547697U (en) * | 2016-11-01 | 2018-06-29 | 苏州宝时得电动工具有限公司 | Power tool |
| WO2019233485A1 (en) * | 2018-06-06 | 2019-12-12 | 苏州宝时得电动工具有限公司 | Hand-held power tool |
| CN112170905B (en) * | 2019-07-01 | 2021-12-03 | 浙江三鸥机械股份有限公司 | Boosting drill chuck |
| CN112191895B (en) * | 2019-07-08 | 2021-11-26 | 浙江三鸥机械股份有限公司 | Automatic clamping centering drill chuck |
| EP4031032A4 (en) * | 2019-09-27 | 2023-09-06 | Bard Access Systems, Inc. | AUTOMATIC ADVANCEMENT FEATURE OF AN INTRA-OSSOUS DEVICE |
| CN112025005A (en) * | 2020-07-29 | 2020-12-04 | 中广核核电运营有限公司 | Hole processing tool |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN107999824A (en) | 2018-05-08 |
| CN207547697U (en) | 2018-06-29 |
| CN207547698U (en) | 2018-06-29 |
| CN107999825A (en) | 2018-05-08 |
| CN107999824B (en) | 2023-09-12 |
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