CN107282959B

CN107282959B - Chuck and power tool using same

Info

Publication number: CN107282959B
Application number: CN201610200198.7A
Authority: CN
Inventors: 保罗·安德罗; 安德列·柴斯托那罗
Original assignee: Positec Power Tools Suzhou Co Ltd
Current assignee: Positec Power Tools Suzhou Co Ltd
Priority date: 2016-03-31
Filing date: 2016-03-31
Publication date: 2021-08-10
Anticipated expiration: 2036-03-31
Also published as: CN107282959A

Abstract

The invention relates to a chuck, comprising a core body which is used for being matched and connected with an output shaft of a power tool, a plurality of clamping jaws which are movably arranged relative to the core body, and a clamping jaw actuating member, wherein the core body is provided with a cavity for accommodating at least part of a working accessory, the relative motion of the clamping jaw actuating member and the core body can drive the clamping jaws to close relative to the core body so as to lock the working accessory or open so as to release the working accessory, and the chuck is characterized in that: the chuck further comprises a supporting device at least partially arranged in the cavity, the supporting device enables the working accessory to be kept in the cavity in an anti-falling mode, the supporting device comprises at least two supporting pieces, each supporting piece is provided with a pressing surface capable of pressing the working accessory, and the pressing surfaces are arc-shaped surfaces. The invention also relates to a power tool using the chuck. The chuck and the power tool with the chuck disclosed by the invention can avoid the safety problem possibly existing when an operator holds the working head by hands during the mounting and dismounting of the working head, and have compact structure.

Description

Chuck and power tool using same

Technical Field

The invention relates to a chuck and a power tool using the chuck.

Background

Power tools typically include electric hammers, electric drills, electric screwdrivers, and percussion drills, among others. When an operator uses the power tool, the operator often attaches and detaches the working head as required. In the process of assembling and disassembling the working head, the working head is often required to be supported by hands, particularly for gun drill type power tools with automatic clamping, the working head is often clamped, but an output shaft of the power tool rotates, so that the working head can rotate along with the output shaft, an operator cannot know whether the working head is clamped or not at the moment, the operator still can continue to support the working head by hands, and the rotating working head can cut the hands of the operator and hurt the operator.

In view of the above, there is a need for a chuck having a holding device that can assist in positioning a working head or a power tool having a similar chuck. Therefore, when the operator installs and removes the working head, the operator does not need to hold the working head of the power tool by hands, and danger is avoided.

Disclosure of Invention

The invention aims to provide a chuck capable of automatically supporting a working head and a power tool using the chuck.

In order to solve the technical problems, the technical scheme adopted by the invention is as follows: a chuck comprises a core body, a plurality of clamping jaws and a clamping jaw actuating piece, wherein the core body is used for being matched and connected with an output shaft of a power tool, the clamping jaws are movably arranged relative to the core body, the core body is provided with a cavity for accommodating at least part of working accessories, the clamping jaw actuating piece and the core body move relatively to drive the clamping jaws to close relative to the core body so as to lock the working accessories or open relative to the core body so as to release the working accessories, the chuck further comprises a supporting device at least partially arranged in the cavity, the supporting device keeps the working accessories in the cavity in an anti-dropping mode, the supporting device comprises at least two supporting pieces, each supporting piece is provided with a pressing surface capable of pressing the working accessories, and each pressing surface is an arc-shaped surface.

Compared with the prior art, the invention has the beneficial effects that: the chuck utilizes the built-in supporting device, the length of the chuck is not increased, and the working head can be automatically and quickly supported when the working head is disassembled and assembled. Therefore, the operator is ensured not to hold the working head by hands when assembling and disassembling the working head, and the safety performance of the chuck is obviously improved.

Preferably, the supporting member can deform or displace along the radial direction of the core under the action of the external pushing force of the working accessory.

Preferably, the supporting member protrudes radially toward the cavity inner side along the core body.

Preferably, the supporting member further comprises a fitting part for connecting the core body, and the fitting part is fixedly connected with the core body along the longitudinal direction of the core body.

Preferably, the at least two supports comprise a common fitting for connecting the core body, which fitting is fixedly connected to the core body in the longitudinal direction of the core body.

Preferably, the number of the supporting pieces is three, and the supporting pieces are arranged in a staggered mode with the clamping jaws along the circumferential direction of the core body.

Preferably, the buttress apparatus further includes a biasing member that biases the buttress member radially inward along the core.

Preferably, the biasing member is a compression spring.

Preferably, the buttress at least partially overlaps the jaw in projection in the longitudinal direction of the core.

The invention adopts the technical scheme that: a power tool comprising a housing, a motor located within the housing, an output shaft driven by the motor and outputting rotary power, the power tool further comprising a chuck as hereinbefore described.

Compared with the prior art, the invention has the beneficial effects that: the power tool is provided with the chuck, the built-in supporting device of the chuck can be utilized, the length of the whole power tool is not increased, and the working head can be automatically and quickly supported when the working head is disassembled and assembled by the chuck. Therefore, the operator is ensured not to hold the working head by hands when assembling and disassembling the working head, and the safety performance of the power tool is obviously improved.

Drawings

The above objects, aspects and advantages of the present invention will become apparent from the following detailed description of specific embodiments, which is to be read in connection with the accompanying drawings.

The same reference numbers and symbols in the drawings and the description are used to indicate the same or equivalent elements.

Figure 1 is a schematic view of a preferred embodiment of the present invention power drill having a chuck.

Figure 2 is a cross-sectional schematic view of a preferred embodiment chuck in accordance with the present invention.

Fig. 3 is an exploded perspective view of the chuck of fig. 2.

Figure 4 is a cross-sectional view of the chuck of figure 2 taken along line a-a.

Fig. 5 is an enlarged view of a portion a of fig. 4.

Figure 6 is a cross-sectional schematic view of another configuration of a preferred embodiment chuck in accordance with the present invention.

FIG. 7 is a cross-sectional schematic view of yet another configuration of a preferred embodiment chuck according to the present invention.

Wherein:

10. casing 12, handle 14 and battery pack

16. Output shaft 18, switch 20, 20' chuck

22. Core 24, sheath 26, clamping jaw

28. Engaging nuts 60, 60' and holding means 62 holding members

622, 622', fixing part 624, pressing surface 160 and supporting device

162. Holding piece 164, pressing surface 166, elastic element

221. Cavity body

Detailed Description

A power drill is one form of power tool to which the present invention is applicable. For convenience, the invention will be described in the following with reference to an electric drill, but it will be appreciated that the invention has broader application to a variety of other power tools, such as electric screwdrivers, electric hammers, bench drills, and the like. The following embodiments will specifically be described. The power tool should include an output shaft for driving the working head to work, the output shaft having an output shaft axis.

Fig. 1 is a schematic diagram of the construction of a preferred embodiment power drill comprising a horizontally disposed housing 10, a handle 12 disposed at an angle to the housing 10, and a removable battery pack 14 located at the bottom of the handle 12. A motor (not shown) and an output shaft 16 driven to rotate by the motor are provided in the housing 10, and a chuck 20 for fixedly attaching a working head to the output shaft 16 is provided at the front end of the housing 10. The power generated by the motor is transmitted to the chuck 20 through the output shaft 16 to drive the working head to work. The output shaft axis X of the output shaft 16 is parallel to or coaxial with the working rotation axis direction of the working head. The handle 12 is provided with a switch 18 which the operator can depress to activate the drill to rotate the working head in either the forward or reverse direction. Of course, the electric drill may use an ac power source instead of a battery.

The working head may be an accessory that directly works on a workpiece, such as a drill bit, a screwdriver bit, a tap bit, or an accessory that is used for switching other adapter and adapter that are not suitable for the chuck 20, and may be collectively referred to as a working accessory. The collet 20 may be non-removably attached to the output shaft 16 or may be removably attached to the output shaft 16. Specifically, the non-detachable connection mode can be various modes such as pin limiting, interference assembly or welding; the detachable connection mode can be various modes such as threaded connection or clamping groove connection. In a preferred embodiment, the connection means is a detachable connection means. In this embodiment, the collet is removably connected to the output shaft by threads.

Referring to fig. 2-4, a chuck 20 in accordance with a preferred embodiment of the present invention includes a chuck core 22, a chuck sheath 24 which fits over the chuck core 22, the chuck core 22 having chuck jaw holes which are angled with respect to its axis, and chuck jaws 26 which fit into the chuck jaw holes in the chuck core 22. In the invention, the number of the clamping jaws 26 is three, and the working accessory is clamped through the combined action of the three clamping jaws 26 to be positioned, so that the working accessory is prevented from loosening. Also, chuck 20 includes a coupling nut 28, and coupling nut 28 is mounted to chuck sheath 24, or coupling nut 28 is fixed relative to chuck sheath 24, and may be integrally formed therewith. The engagement nut 28 has internal threads and the jaws 26 have external threads, and the engagement nut 28 mates with the internal and external threads on the jaws 26. When the clamping jaws 26 move, the clamping jaws 26 are matched with the meshing nuts 28 through external threads to move along the inclined clamping jaw holes so as to clamp or loosen the working accessories, so that the clamping jaws 26 can stably run in the moving process, the moving processes of the clamping jaws 26 are consistent, and the clamping jaws 26 can accurately position the working accessories. Movement of the jaws 26 is effected by movement of the chuck sheath 24 or the engaging nut 28 relative to the chuck core 22, where the relative movement can be in a variety of circumstances, such as rotation of the engaging nut 28 relative to the housing 30, with the chuck core 22 stationary; or the union nut 28 is fixed and the cartridge core 22 is rotated. That is, rotation of the engagement nut 28 relative to the collet core 22 can actuate the jaws 26, i.e., act as a jaw actuating member.

The chuck 20 further comprises a holding device 60 for assisting the chuck in positioning the working head, and the holding device 60 is hidden inside the chuck 20. When the working head is disassembled, the supporting device 60 supports the working head to enable the working head to be quickly clamped or disassembled by the chuck 20. In the assembling and disassembling process, an operator only needs to place the working head into the supporting device 60, and in the clamping or disassembling process of the chuck 20, particularly, the chuck which can be automatically clamped or loosened by utilizing the rotation driving of the electric drill is not needed to be supported by the hand of the operator, so that the danger brought to the operator by the possibly-rotating working head is avoided, and the safety performance of the electric drill is improved. And the supporting device 60 is adopted to assist in positioning the working head, so that the working head can be ensured to be positioned on the axis X of the output shaft, and the working precision is ensured. In addition, the built-in supporting device 60 does not increase the length of the chuck 20, and can keep the electric drill short and compact. Moreover, an operator can observe the working state of the clamping jaw 26 at any time, so that the installation position of the working head in the clamping jaw 26 can be conveniently observed, and the actual use of a user is facilitated.

The supporting device 60 is arranged on the chuck core body 22 and comprises a supporting piece 62, the core body 22 is provided with a cavity 221, at least part of the supporting device 60 is arranged in the cavity 221, the working head is inserted into the cavity 221 in the chuck core body 22, namely, the cavity 221 can contain at least part of the working head, the supporting piece 62 is in contact with the working head, and along with the movement of the working head, the supporting piece 62 can generate radial deformation or displacement under the action of the external pushing force of the working head and has a supporting effect on the working head. Specifically, the three holding members 62 are preferably provided, and are evenly spaced in the circumferential direction of the core, and the three holding members 62 and the three jaws 26 are circumferentially offset from each other. The buttress 62 has a length in the longitudinal direction of the core, and the buttress 62 at least partially overlaps the projection of the jaw 26 in the longitudinal direction of the core 22. The holding member 62 has a fitting portion 622 fixedly connected to the core body 22 and a pressing surface 624 abutting against the working head, the three holding members 62 may have three separate fixing portions, or may share one fitting portion 622, the periphery of the fitting portion 622 is approximately matched with the shape of the cavity, and has an edge extending radially inward, when the chuck is mounted on the output shaft 16 by screwing, the screw presses the inner edge of the fitting portion 622, so that the fitting portion 622 is fixed relative to the chuck core body 22, which is a relatively versatile manner. Of course, if three mating portions are provided, they may be connected in the above manner. Or by other means such as welding, gluing, etc. In the present embodiment, a fitting portion 622 is preferably used, which is substantially annular, and the pressing surfaces 624 extend along the axial direction of the annular, and are uniformly distributed along the circumferential direction. The holding member 62 is preferably a metal elastic sheet, and is substantially V-shaped or U-shaped, that is, the core 22 of the pressing surface 624 protrudes radially inward of the cavity 221, and the transverse cross-section of the pressing surface 624 is arc-shaped, or the pressing surface 624 is arc-shaped along the transverse direction of the core 22, so that the contact area with the working head can be increased, and the holding is stable. When the working heads with different diameters extend, the elastic sheets can stretch to a certain size by means of thrust, so that the working heads are supported.

In other alternative ways, the support member may also be disposed along the radial direction of the chuck core 22, and the axial displacement is generated by the external pushing force of the working head and supports the working head. Specifically, the supporting piece comprises a deformation part, the working head penetrates through the deformation part, and the deformation part deforms and plays a supporting role in the working head. In a specific embodiment, the supporting member is made of soft materials such as rubber, nylon or elastic plastics, and the shore hardness range of the soft materials is 30-90 degrees. In a preferred embodiment, the supporting member is made of rubber, so that the supporting member can better support the working head. The supporting piece can play a role in buffering and supporting the working head, when the working head works, the supporting piece cannot damage the working head when contacting with the working head, and the service life of the working head is prolonged.

Referring to fig. 5, as another alternative embodiment, the supporting device 160 of the chuck comprises a supporting member 162 and an elastic member 166 pressing against the supporting member 162, wherein the supporting member 162 can be a rigid member movably mounted on the chuck core 22 for supporting working heads with different diameters. The supporting member 162 has a pressing surface 164 for abutting against the working head, and the cross section of the pressing surface 164 is arc-shaped, so that the contact area with the working head can be increased, and the supporting is stable. In addition, the pressing surface 164 has a certain length along the longitudinal direction of the core 22, and is matched with the arc-shaped section to form surface contact with the working head, so that the supporting force is increased. The resilient force provided by the resilient member 166 urges the buttress 162 to have a tendency to move toward a resting position in which it butts against the working head, the resilient member 166 preferably being a compression spring. In this example, the number of the supporters 162 is three, and the supporters are circumferentially and uniformly connected to the collet core 22. Under the action of the elastic element 166, the three supports 162 have a tendency to close together, i.e. to move towards the support position where they support the working head.

Referring to FIG. 6, in yet another embodiment of the chuck, the structure of the chuck 20 ' is generally similar to the previously described chucks, except that the mating portion 622 ' of the holding device 60 ' is secured relative to the chuck core 22 by insertion into a slot in the chuck core 22, preferably a slot axially disposed along the chuck core 22, for ease of manufacture and installation. Of course, if three mating portions are provided, it is also possible to insert grooves provided in the radial direction of the collet core 22.

The holding means 60, 60', 160 are hidden inside the chuck 20, and the hiding refers to that when the chuck 20 is clamped to the working head, the holding means is not visible from the outside of the chuck 20, or the chuck with the holding means is not different from the chuck without the holding means in appearance. So set up the complete machine length that can not increase the electric drill, support the effect and compare in supporting the working head outside the chuck, more can guarantee that the working head is by clamping part and the axial axiality of output shaft, support effectually, can not shelter from the outside working head of chuck moreover, the regional visuality of working head is good, if set up the LED lamp of illumination on the electric drill in addition, LED lamp light also can not be sheltered from by chuck support piece.

When the electric drill is in a use state, the working head is clamped in the clamping jaw and is contacted with the clamping jaw. The user grasps the handle 12 and actuates the drill by depressing a switch 18 on the handle 12. Depressing the switch 18 on the handle 12 causes current to flow from the battery or power cord to the motor, which in turn rotates the output shaft 16 and thus the cartridge core 22, which in turn causes rotational movement of the working head via the jaws 26. Before and after the electric drill is used, a user needs to assemble and disassemble the working head, in the assembling and disassembling process of the user, the supporting piece can play a supporting role on the working head, the working head is guaranteed to be kept at the axis position, the user is prevented from supporting the working head by hands, the working head is prevented from being thrown away, and the user safety of the electric drill is improved. Moreover, the supporting device is simple in structure, and the effect can be achieved only through the supporting piece.

The above chuck structure is only a relatively common chuck structure, and there are also other types of chucks that can be provided with a built-in supporting device, such as the chuck structure disclosed in chinese patent CN101056732B, the chuck structure disclosed in chinese patent CN101508030B, the chuck structure disclosed in chinese published patent application CN102962496A, and so on.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. A chuck for use with an output shaft of a power tool, the chuck including a core for mating with the output shaft of the power tool, a plurality of jaws movably disposed relative to the core, the core having a cavity for receiving at least a portion of a working attachment, and jaw actuation members movable relative to the core for actuating the plurality of jaws toward one another relative to the core to lock the working attachment or to release the working attachment, the chuck comprising: the chuck further comprises a supporting device at least partially arranged in the cavity, the supporting device keeps the working accessory in the cavity in an anti-falling mode, the supporting device comprises at least two supporting pieces, each supporting piece is provided with a pressing surface capable of pressing the working accessory, and the pressing surfaces are arc-shaped surfaces; the supporting piece can generate deformation along the radial direction of the core under the action of the external pushing force of the working accessory, the supporting piece comprises a deformation part, the deformation part deforms and plays a supporting role on the working accessory, the supporting piece further comprises an adapting part used for connecting the core, and the adapting part is fixedly connected with the core along the longitudinal direction of the core.

2. The chuck of claim 1, wherein: the supporting piece protrudes to the inner side of the cavity along the radial direction of the core body.

3. The chuck of claim 1, wherein: the at least two supports comprise a common matching part for connecting the core body, and the matching part is fixedly connected with the core body along the longitudinal direction of the core body.

4. The chuck of claim 1, wherein: the quantity of holding piece is three, along the circumference of core with a plurality of clamping jaw stagger the setting.

5. The chuck of claim 1, wherein: the buttress apparatus also includes a biasing member that biases the buttress member radially inward along the core.

6. The chuck of claim 5, wherein: the biasing member is a compression spring.

7. The chuck of claim 1, wherein: the supporting piece and the clamping jaw at least partially overlap in projection along the longitudinal direction of the core body.

8. A power tool comprising a housing, a motor located in the housing, an output shaft driven by the motor and outputting rotational power, characterized in that: the power tool comprising a chuck according to any one of claims 1 to 7.