CN219767764U - Electric tool - Google Patents

Abstract

The disclosure provides an electric tool, comprising a handle and a handle mounting seat, wherein the handle and the handle mounting seat are connected through a first connecting mechanism; the first end of the handle comprises at least two conductive rings, a first conductive ring and a second conductive ring, wherein the at least two conductive rings are concentrically arranged by taking the axle center of the handle as the center of a circle; the handle mounting seat comprises at least two electric connection contacts, and the at least two electric connection contacts are respectively in one-to-one correspondence with the at least two conductive rings; the first connecting mechanism comprises a first connecting part and a second connecting part; the first connecting portion is a side wall of the first end of the handle, and the second connecting portion is at least one annular wall arranged at one end of the handle mounting seat along the length direction of the handle. The quick detachable connection of the head and the handle is realized through the first connecting mechanism, the electric connecting structure of the contact and the conducting ring is adopted to be matched with the detachable connecting structure, the quick disconnection and connection of the electric connection are realized in the mechanical dismounting process of the contact and the conducting ring, and the reliability of the device is improved.

Description

Electric tool

Technical Field

The present disclosure relates to the field of power tools, and more particularly, to a hand-held power tool.

Background

Hand-held power tools typically include a handle for holding and a head, such as a direct drive angle grinder, provided with a drive motor and a function, with a battery pack disposed in the handle. Existing power tool housings are typically of an integrated design, i.e., the housing is injection molded once, with the drive motor, battery and circuit board mounted inside the housing.

The head and the handle of the structure are inconvenient to assemble and disassemble, and the replacement and maintenance of parts are time-consuming. In order to meet the requirements of electrical connection and mechanical connection of the head and the handle, special design needs to be carried out inside the handle and the head shell, the electrical connection and the mechanical connection are complex, and the reliability is poor.

Disclosure of Invention

In view of the above, an object of the present disclosure is to provide an electric tool, which solves at least one of the problems of inconvenient disassembly and maintenance, complicated electrical and mechanical connection, and poor reliability.

Based on the above object, the present disclosure provides a power tool including: the handle is connected with the handle mounting seat through a first connecting mechanism; the first end of the handle comprises at least two conductive rings, a first conductive ring and a second conductive ring, wherein the at least two conductive rings are concentrically arranged by taking the axle center of the handle as the center of a circle; the handle mounting seat comprises at least two electric connection contacts, and the at least two electric connection contacts are respectively in one-to-one correspondence with the at least two conductive rings; the first connecting mechanism comprises a first connecting part and a second connecting part; the first connecting portion is a side wall of the first end of the handle, the second connecting portion is at least one annular wall arranged at one end of the handle mounting seat along the length direction of the handle, and the first end of the handle is placed in the annular wall to realize the interconnection of the handle and the handle mounting seat.

Further, the handle can rotate in the handle mounting seat relative to the handle mounting seat, and the at least two electric connection contacts and the at least two conductive rings are always in an electric connection state.

Further, the at least two conductive rings are arranged on the end face of the first end of the handle, and the diameters of the at least two conductive rings are different.

Further, a second connecting mechanism is further arranged between the handle and the handle mounting seat and is arranged along the axle center of the handle; the second connecting mechanism comprises a third connecting part and a fourth connecting part which are respectively arranged on the handle and the handle mounting seat.

Further, the third connecting portion and the fourth connecting portion are connected through threads.

Further, a drive control circuit board is arranged in the handle or the handle mounting seat and is electrically connected with the electric connection contact or the conducting ring.

Further, a battery pack is arranged in the handle and is electrically connected with the electric connection contact or the conducting ring.

Further, the electric power device also comprises a power box which is arranged at the other end of the handle, and a battery pack is arranged in the power box and is electrically connected with the electric connection contact or the conducting ring.

Further, the device also comprises a head part, wherein the head part comprises a head shell and a driving motor arranged in the head shell; the handle mounting seat is arranged on the head.

Further, the electric tool is an angle grinder.

Compared with the prior art, the technical scheme of the present disclosure has the following beneficial effects: the head and the handle are mutually sleeved, so that the detachable connection of the head and the handle is realized, the disassembly, the assembly and the maintenance are convenient, and the mechanical connection of the head and the handle is simplified; two groups of connecting structures are adopted between the head and the handle, so that the reliability of mechanical connection of the head and the handle is ensured; the contact and the conducting ring are adopted between the head and the handle as electric connection structures, and are matched with the detachable connection structures of the head and the handle, so that quick disconnection and connection of electric connection are realized in the mechanical dismounting process of the head and the handle; and when the head and the handle can relatively rotate, the head and the handle are always electrically connected, and meanwhile, the reliability of mechanical connection and electrical connection is realized.

Drawings

In order to more clearly illustrate the technical solutions of the present disclosure or related art, the drawings required for the embodiments or related art description will be briefly described below, and it is apparent that the drawings in the following description are only embodiments of the present disclosure, and other drawings may be obtained according to these drawings without inventive effort to those of ordinary skill in the art.

FIG. 1 is a schematic overall view of an embodiment of a power tool of the present disclosure;

FIG. 2 is an exploded view of one embodiment of the power tool of the present disclosure;

FIG. 3 is an enlarged view of a portion of a handle of an embodiment of the power tool of the present disclosure;

FIG. 4 is a partial exploded view of one embodiment of the power tool of the present disclosure;

FIG. 5 is a cross-sectional view of an embodiment of the power tool of the present disclosure;

FIG. 6 is a schematic overall appearance of another embodiment of the power tool of the present disclosure;

fig. 7 is a cross-sectional view of another embodiment of the power tool of the present disclosure.

In the figure: 1. a head; 100. a head shell; 101. a drive motor housing; 102. a reduction gearbox housing; 103. a groove; 2. a handle; 201. a switch; 202. a first connection portion; 3. a driving motor; 4. a reduction gearbox; 5. grinding; 6. a power supply box; 601. a battery pack; 7. a handle mounting base; 701. a head shell connecting part; 702. a handle connecting part; 703. a guide hole; 704. a second connecting portion; 8. a drive control circuit board; 9. a third connecting portion; 901. a first end; 902. a second end; 10. a fixing belt; 1000. a connection hole; 11. a shield; 12. an electrical connection contact; 13. a conductive ring; 131. a first conductive ring; 132. a second conductive ring; 14. a clamping groove; 15. a fourth connecting portion; 16. a power circuit board.

Detailed Description

For the purposes of promoting an understanding of the principles and advantages of the disclosure, reference will now be made to the embodiments illustrated in the drawings and specific language will be used to describe the same.

It should be noted that unless otherwise defined, technical or scientific terms used in the embodiments of the present disclosure should be given the ordinary meaning as understood by one of ordinary skill in the art to which the present disclosure pertains. The terms "first," "second," and the like, as used in embodiments of the present disclosure, do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that elements or items preceding the word are included in the element or item listed after the word and equivalents thereof, but does not exclude other elements or items. The terms "connected" or "connected," and the like, are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", etc. are used merely to indicate relative positional relationships, which may also be changed when the absolute position of the object to be described is changed.

Referring to fig. 1-5, an embodiment of a power tool provided by the present disclosure includes a handle 2 and a handle mount 7, the handle 2 and the handle mount 7 being connected by a first connection mechanism. The handle 2 is preferably hollow cylinder in shape.

As shown in fig. 3, the first end of the handle 2 includes at least two conductive rings 13, a first conductive ring 131 and a second conductive ring 132, and the first conductive ring 131 and the second conductive ring 132 are concentrically arranged around the axis of the handle 2. The conductive ring 13 is a ring-shaped metal sheet.

The first conductive ring 131 and the second conductive ring 132 are provided at an end face of the first end of the handle 2, and have different diameters. Alternatively, the first conductive ring 131 and the second conductive ring 132 may be disposed on a side wall of the first end of the handle 2, and have the same diameter. Preferably, the end face of the first end of the handle 2 is provided with a recess in which the conductive ring 13 is arranged.

The handle mounting seat 7 comprises at least two electric connection contacts 12, and the electric connection contacts 12 are matched with the at least two conductive rings 13 for use, and the two electric connection contacts 12 are contacted with the two conductive rings 13 in a one-to-one correspondence manner to form electric connection.

It will be appreciated that the positions of the electrical connection contact points 12 and the conductive ring 13 may be interchanged, i.e. the electrical connection contact points 12 are provided on the handle 2 and the conductive ring 13 is provided on the handle mount 7.

Optionally, the number of the conductive rings 13 is three, and the corresponding electrical connection contacts 12 are also three, which respectively correspond to three control wires of the brushless motor.

The first connection mechanism includes a first connection 202 and a second connection 704. The first connecting portion 202 is a side wall of the first end of the handle 2, and the second connecting portion 704 is at least one annular wall disposed at one end of the handle mount 7 along the length direction of the handle 2. The annular wall forms a receiving cavity to facilitate insertion of the first end of the handle 2, enabling interconnection of the handle 2 and the handle mount 7. The connection mode of the annular wall and the handle 2 can be an insertion mode or a rotary connection mode, and threads are arranged on the inner wall of the annular wall and the outer wall of the handle 2.

Alternatively, the first connecting portion 202 is a stepped surface of the sidewall of the first end of the handle 2, which is formed by the fact that the outer diameter of the top sidewall of the handle 2 is smaller than that of the body of the handle 2. The outer diameter of the step surface is consistent with the inner diameter of the annular wall. The connection of the handle 2 and the handle mount 7 can be achieved by inserting the step surface into the annular wall.

Alternatively, the first connecting portion 202 may be provided as an annular wall provided on the handle 2 in the longitudinal direction of the handle 2, and the second connecting portion 704 may be provided as a stepped surface (not shown) at one end of the head case 100, as needed.

The number of the annular walls can be two, two annular walls with different inner diameters are concentrically arranged on the handle mounting seat 7, one or two annular walls are arranged at one end of the handle 2, and the annular walls of the handle 2 and the annular walls of the handle mounting seat 7 are mutually spliced to improve the connection reliability of the handle 2 and the handle mounting seat 7.

The at least two electrical connection contacts 12 are always in electrical connection with the at least two conductive rings 13 when the handle 2 is rotated relative to the handle mount 7 while the handle 2 remains connected to the handle mount 7.

The electric tool further comprises a head 1 arranged at one end outside the handle 2, and a handle mounting seat 7 is arranged on the head 1. The head 1 includes a head case 100 and a driving motor 3 provided in the head case 100. The output shaft of the driving motor 3 is fixedly connected with the functional piece. The functional members are members that perform a certain function, such as a grinding blade 5 that performs a grinding function, a saw blade that performs a cutting function, a drill bit that performs a drilling function, and the like. The functional component is covered with a shield 11, and the shield 11 is used for protecting the functional component.

The head 1 is fixed to the handle 2 by a fixing strap 10. The fixing strap 10 is a strap bent into a ring shape, and is fitted over the head case 100 to clamp the head case 100. The end of which is provided with a connecting hole 1000 for connecting the fixing strap 10 with the handle 2 via a third connecting portion 9. The material of the fixing band 10 is preferably steel band.

Alternatively, the driving motor 3 is a direct current brush motor, an alternating current motor, or a brushless motor.

The drive motor 3 is preferably an external rotor brushless motor having a high rotational speed and a small volume.

Preferably, the head housing 100 further comprises a reduction gearbox 4, wherein the reduction gearbox 4 comprises a reduction mechanism, preferably a planetary gear transmission mechanism with high transmission efficiency. The output shaft of the driving motor 3 is connected with the grinding disc 5 through a speed reducing mechanism. By adopting the reduction mechanism, the torque force of the drive motor 3 is increased while the size of the drive motor 3 is reduced. As shown in fig. 2, the head case 100 further includes a driving motor housing 101 and a reduction gearbox housing 102 connected to each other, and the driving motor housing 101 and the reduction gearbox housing 102 are connected by screw threads.

Preferably, the handle mount 7 includes a head housing connection part 701 and a handle connection part 702, the head housing connection part 701 being a side close to the head housing 100, and the handle connection part 702 being a side close to the handle 2. The head case connection part 701 has a shape matching that of the head case 100 so as to form a surface contact with the head case 100, improving the fixing effect of the head case 100. As shown in fig. 2 to 4, the head case connection part 701 is provided in an arc shape to be fitted with the head case 100. It can be appreciated that if the head case 100 is square, the head case connection part 701 is provided in a planar shape, and the shape of the head case connection part 701 is adjusted according to the shape of the head case 100.

As shown in fig. 4, the second connection portion 704 is provided at the end of the handle connection portion 702. The handle connection 702 also includes at least two electrical connection contacts 12.

Preferably, a second connecting mechanism is further arranged between the handle 2 and the handle mounting seat 7, and the second connecting mechanism is arranged along the axis of the handle 2; the second connecting mechanism comprises a third connecting part 9 and a fourth connecting part 15 which are respectively arranged on the handle 2 and the handle mounting seat 7. Preferably, the third connecting portion 9 and the fourth connecting portion 15 are screw-threaded. The third connecting portion 9 is preferably a T-shaped flat head bolt, and the head of the third connecting portion 9 extends outwardly to form a first end 901 and a second end 902. The first end 901 and the second end 902 cooperate with the connection hole 1000. The first end 901 and the second end 902 can be inserted into the connection hole 1000 to fixedly connect the third connection portion 9 to the fixing band 10. The third connecting portion 9 may also be a round head bolt as long as the head of the bolt is ensured to be larger than the connecting hole 1000.

One end of the fourth connecting part 15 connected with the third connecting part 9 is provided with a mounting hole, an internal thread is arranged in the mounting hole, and an external thread of the rod part of the third connecting part 9 is matched and connected with an internal thread arranged on the fourth connecting part 15.

The head case 100 is fixed to the handle 2 by the fixing band 10 and the third connecting portion 9. Since the head case 100 and the handle 2 are screw-coupled, the head case 100 can be fixed and released by rotating the handle 2.

As shown in fig. 4, the handle connecting portion 702 further includes a guide hole 703, the guide hole 703 penetrates the handle mounting seat 7 along the length direction of the handle 2, and the third connecting portion 9 penetrates the handle connecting portion 702 through the guide hole 703 and then is connected to the mounting hole of the handle 2. The third connection part 9 can linearly move within the guide hole 703 to improve the movement stability of the third connection part 9. The head of the third connecting portion 9 is disposed in a limiting groove (not shown) to prevent the third connecting portion 9 from rotating with the rotation of the handle 2.

Alternatively, the third connecting portion 9 may be an internal thread, and the fourth connecting portion 15 may be an external thread that mates with the third connecting portion 9, as desired.

A power circuit board 16 electrically connected to the battery pack 601 is provided in the handle 2, and the power circuit board 16 is electrically connected to the conductive ring 13. When the first connection portion 202 is provided with the electrical connection contact 12, the power circuit board 16 is in contact with the power circuit board 16. The electrical connection contact 12 is electrically connected to the battery pack 601.

Alternatively, the fixing strap 10 may be a fixing strap capable of bearing a large load, such as a plastic steel stranded strap, a nylon stranded strap, or the like, in addition to a metal strap, such as a steel strap, a galvanized strap, or the like.

Alternatively, the third connecting portion 9 may be selectively actuated electrically, for example, by an actuating mechanism such as an electric push rod or an electric rail, as needed, and controlled by a switch.

A drive control circuit board 8 is arranged in the handle mounting seat 7, and the drive control circuit board 8 is electrically connected with the electrical connection contact 12. The outer end of the conductive ring 13 is provided with three groups of concave clamping grooves 14 which are uniformly distributed. The clamping groove 14 is provided with a step surface. The second connecting portion 704 is further provided with a plurality of clips (not shown) near the end of the handle 2, which are matched with the clamping groove 14 and the step surface. The clamping grooves 14 are used in one-to-one correspondence with the clamping bands. A gap for the third connecting part 9 to act is reserved between the clamp and the step surface. The clip can rotate along the stepped surface and can enter the card slot 14 and move inside the card slot 14. The second connection 704 can be separated from the handle 2 when the clip enters the slot 14.

Alternatively, two, four, etc. clamping grooves 14 may be selected according to the need, without limitation, and whether the clamping grooves are in one-to-one correspondence with the clamping bands or not may be selected, and it should be noted that the number of the clamping bands does not exceed the number of the clamping grooves 14.

Optionally, the outer surface of the head case 100 is provided with a groove 103 for receiving the fixing strap 10, and the groove 103 can limit the up-down position of the fixing strap 10 to prevent the fixing strap 10 from being separated from the head case 100.

Optionally, a charging interface electrically connected to the battery pack 601 and/or a reverse charging interface is further provided at the bottom end or side wall of the handle 2, for charging the battery pack 601 or supplying power to other external devices. The interface is a USB interface, a TYPE-C interface, or the like.

As shown in fig. 7, in another embodiment of the present disclosure, a difference from the above-described embodiment is that a power supply box 6 connected to the other end of the handle 2 is further included. The detachable connection mode or the fixed connection mode can be selected according to whether the power supply needs to be replaced or not between the handle 2 and the power supply box 6. The detachable connection mode is realized by adopting conventional technical means such as sliding grooves, sliding rails, screws and the like, and an inserting interface or a clamping interface can be arranged at the connection part of the handle 2 and the power supply box 6. Through the detachable connection mode, a user can easily replace the battery to meet the power supply requirements of different capacities or different powers, or replace a new battery after the battery is exhausted, so that the battery is convenient to use.

The power supply box 6 includes: a power pack housing and a battery pack 601. The battery pack 601 is disposed within the power pack housing. The driving motor 3 is electrically connected to the battery pack 601. The battery pack 601 is arranged outside the handle 2, so that the continuous operation experience of the handle 2 can be prevented from being influenced by the heat generated by the battery pack 601. The battery pack 601 is electrically connected to the conductive ring 13.

A switch 201 is also arranged on the lower side of the handle 2, and the switch 201 is used for controlling the starting and stopping of the driving motor 3. A portion of the switch 201 exposes the outer end of the handle 2 for pressing. Another part of the switch 201 is provided inside the handle 2. The switch 201 is a click type and is electrically connected with the driving motor 3, the circuit is switched on after an operator manually presses the switch 201, the driving motor 3 is switched on, and when the switch 201 is not pressed any more, the circuit is switched off, and the driving motor 3 is stopped. The operator can control the starting and stopping of the driving motor 3 while holding the handle 2, thereby being convenient to use.

Optionally, the switch 201 may also be disposed on the upper side of the handle mount 7 and connected to the drive circuit board 8 by a wire.

In some embodiments of the present utility model, in some embodiments,

optionally, the portable electric power source further comprises a driving control circuit board 8, wherein the driving control circuit board 8 is arranged in the power source box shell, is positioned between the battery pack 601 and the handle 2, and is electrically connected with the battery pack 601 and the conducting ring 13. Therefore, the heat emitted by the drive control circuit board 8 can be prevented from being transmitted to the handle 2, and the operation experience of the handle 2 is prevented from being influenced;

alternatively, the drive control circuit board 8 may be provided in the handle 2.

In some embodiments, the power tool is an angle grinder, or a hand-held power saw, or an electric drill, or an electric wrench, or an electric screwdriver, or the like.

Compared with the prior art, the technical scheme provided by the disclosure has the following beneficial effects: the head 1 and the handle 2 are mutually sleeved, so that the detachable connection of the head 1 and the handle 2 is realized, the disassembly, the assembly and the maintenance of the head 1 and the handle 2 are convenient, and the mechanical connection of the head 1 and the handle 2 is simplified; two groups of connecting structures are adopted between the head 1 and the handle 2, so that the reliability of mechanical connection of the head 1 and the handle 2 is ensured; the electric connection contact 12 and the conducting ring 13 are adopted between the head 1 and the handle 2 as electric connection structures, and are matched with the detachable connection structures of the head 1 and the handle 2, so that quick disconnection and connection of electric connection are realized in the mechanical dismounting process of the head 1 and the handle 2; and because the adopted conductive ring 13 is a concentric ring, when the head 1 and the handle 2 rotate relatively, the two are always electrically connected, and meanwhile, the reliability of mechanical connection and electrical connection is realized.

While the present disclosure has been described in conjunction with specific embodiments thereof, many alternatives, modifications, and variations of those embodiments will be apparent to those skilled in the art in light of the foregoing description.

The disclosed embodiments are intended to embrace all such alternatives, modifications and variances which fall within the broad scope of the appended claims. Accordingly, any omissions, modifications, equivalents, improvements, and the like, which are within the spirit and principles of the embodiments of the disclosure, are intended to be included within the scope of the disclosure.

Claims (10)

1. The electric tool is characterized by comprising a handle (2) and a handle mounting seat (7), wherein the handle (2) is connected with the handle mounting seat (7) through a first connecting mechanism;

the first end of the handle (2) comprises at least two conducting rings (13), a first conducting ring (131) and a second conducting ring (132), wherein the at least two conducting rings (13) are concentrically arranged by taking the axle center of the handle (2) as the center of a circle;

the handle mounting seat (7) comprises at least two electric connection contacts (12), and the at least two electric connection contacts (12) are respectively in one-to-one correspondence with the at least two conductive rings (13);

the first connection mechanism comprises a first connection part (202) and a second connection part (704); the first connecting part (202) is a side wall of the first end of the handle (2), the second connecting part (704) is at least one annular wall arranged at one end of the handle mounting seat (7) along the length direction of the handle (2), and the first end of the handle (2) is placed in the annular wall to realize the interconnection of the handle (2) and the handle mounting seat (7).

2. The power tool of claim 1, wherein: the handle (2) can rotate in the handle mounting seat (7) relative to the handle mounting seat (7), and the at least two electric connection contacts (12) and the at least two conductive rings (13) are always in an electric connection state.

3. The power tool of claim 1, wherein: the at least two conductive rings (13) are arranged on the end face of the first end of the handle (2), and the diameters of the at least two conductive rings (13) are different.

4. The power tool of claim 1, wherein: a second connecting mechanism is further arranged between the handle (2) and the handle mounting seat (7), and the second connecting mechanism is arranged along the axis of the handle (2); the second connecting mechanism comprises a third connecting part (9) and a fourth connecting part (15) which are respectively arranged on the handle (2) and the handle mounting seat (7).

5. The power tool of claim 4, wherein: the third connecting part (9) and the fourth connecting part (15) are connected through threads.

6. The power tool of claim 1, wherein: a drive control circuit board (8) is arranged in the handle (2) or the handle mounting seat (7) and is electrically connected with the electric connection contact (12) or the conducting ring (13).

7. The power tool of claim 1, wherein: a battery pack (601) is arranged in the handle (2) and is electrically connected with the electric connection contact (12) or the conductive ring (13).

8. The power tool of claim 1, wherein: the electric power device also comprises a power box (6) which is arranged at the other end of the handle (2), and a battery pack (601) is arranged in the power box (6) and is electrically connected with the electric connection contact (12) or the conducting ring (13).

9. The power tool of claim 1, wherein: the head part (1) comprises a head shell (100) and a driving motor (3) arranged in the head shell (100); the handle mounting seat (7) is arranged on the head (1).

10. The power tool according to any one of claims 1 to 9, wherein: the electric tool is an angle grinder.