WO2013078781A1

WO2013078781A1 - Novel electric hammer

Info

Publication number: WO2013078781A1
Application number: PCT/CN2012/070301
Authority: WO
Inventors: 王文江
Original assignee: 浙江海王电器有限公司
Priority date: 2011-12-02
Filing date: 2012-01-13
Publication date: 2013-06-06
Also published as: CN102513978B; CN102513978A

Abstract

A novel electric hammer comprises a machine body (23). A drive motor, a gear transmission mechanism, a rotary sleeve (39), and an impact mechanism (42) are mounted in the machine body. The drive motor is connected to an input end of the gear transmission mechanism. An output end of the gear transmission mechanism is connected to the rotary sleeve (39). The electric tool further comprises a drill chuck (22). The drill chuck (22) is hollow. The drill chuck (22) is mounted on the rotary sleeve (39) through a fixing connecting device. The drill chuck (22) is provided with a through hole that an electric hammer bit runs through. The electric hammer bit is mounted in the rotary sleeve (39). The impact mechanism (42) is located behind the electric hammer bit. An outer wall of the drill chuck is provided with a holding member for holding the electric hammer bit. The novel electric hammer makes operation convenient and comfortable, makes hole-boring precise high, and is a novel electric hammer with high processing efficiency.

Description

A new type of electric hammer

The invention relates to a power tool.

Background technique

For the existing electric hammer, referring to Fig. 1, Fig. 1A and Fig. 1B, the electric hammer function drill bit 12 is clamped on the electric hammer to realize the concrete drilling operation. When drilling steel or wood, refer to Fig. 2, Fig. 2A and 2B, it needs to be additionally connected with the drill chuck 101 by the connecting rod 102 and then assembled on the electric hammer, and then the twist drill bit 100 or other drill bit is clamped on the drill chuck 101 to realize the drilling operation, that is, the electric drill function is performed; When the user replaces the electric hammer function and the electric drill function, the drill chuck 101 needs to be installed and disassembled. In actual use, the drill chuck is frequently installed and disassembled, which results in very inconvenient operation, and the connecting rod structure is adopted in the function of the electric drill. The connection accuracy between the connecting rod and the drill head and the head portion of the electric hammer is poor, which is likely to cause a large jump, and thus the punching accuracy is low, and the user feels uncomfortable and the processing efficiency is low.

Summary of the invention

In order to overcome the inconvenience of the operation of the electric hammer in realizing the electric drill function, the drilling precision is low, and the processing efficiency is low, the invention provides a novel operation with convenient operation, high drilling precision and high processing efficiency. Electric hammer.

The technical solution adopted by the present invention to solve the technical problem thereof is:

A new type of electric hammer includes a fuselage, a driving motor, a gear transmission mechanism, a rotating sleeve and an impact mechanism are mounted in the fuselage, the driving motor is connected with an input end of the gear transmission mechanism, and an output end of the gear transmission mechanism Connected to the rotating sleeve, the new battery further includes a drill chuck, the drill chuck is hollow, and the drill chuck is mounted by a fixed connection device The rotating chuck is provided with a through hole through which the power hammer bit passes, the electric hammer bit is installed in the rotating sleeve, and the impact mechanism is located behind the electric hammer bit, The outer wall of the drill chuck is provided with a clamping member for holding the electric drill bit.

Further, the drill chuck is a hand-tight drill chuck and a wrench-type drill chuck with a clamping size of 6-20 mm. The above are two common methods, and of course, other ways can be implemented.

The fixed connection device includes a spline and a keyway, the outer wall of the rotating sleeve is provided with a spline, and an inner wall of the drill chuck is provided with a keyway that cooperates with the spline, and the spline is nested in the keyway .

Further, the rotating sleeve is provided with a first pin hole, and the drill chuck is provided with a second pin hole, and the fixing pin is sequentially installed in the first pin hole and the second pin hole; The first cylindrical pin hole is further opened, and the drill chuck is provided with a second cylindrical pin hole, and the cylindrical pin is sequentially installed in the first cylindrical pin hole and the second cylindrical pin hole.

Or the: the fixed connecting device includes an internal thread and an external thread, the outer wall of the rotating sleeve is provided with an external thread, and an inner wall of the drill chuck is provided with an internal thread that cooperates with the external thread, and the external thread is installed at Inside the internal thread.

Or the: the fixed connecting device comprises an inner tapered surface and an outer tapered surface, wherein the outer wall of the rotating sleeve is provided with an outer tapered surface, and an inner wall of the drill chuck is provided with an inner tapered surface that cooperates with the outer tapered surface, The outer tapered surface is mounted within the inner tapered surface.

Or the: the fixed connecting device comprises a pin, the outer wall of the rotating sleeve is set on the inner wall of the drill chuck, the rotating sleeve has a first pin hole, and the drill chuck has a second pin a hole, the pin is sequentially installed in the first pin hole and the second pin hole, the rotating sleeve is further provided with a first cylindrical pin hole, and the drill chuck has a second cylindrical pin hole, a cylinder Sales Installed in the first cylindrical pin hole and the second cylindrical pin hole.

Of course, the fixed connection device can also be implemented in other ways.

Further, the fixing sleeve is located at the rear of the drill chuck and is disposed on the drill chuck and the rotating sleeve. The fixing sleeve is provided with a fixing ring, and one end of the return spring is mounted on the fixing ring, the return spring The other end is mounted on the rotating sleeve; the fixing sleeve simultaneously blocks the pin for axially positioning the drill chuck and the rotating sleeve and the cylindrical pin for axially positioning the hammer bit.

Preferably, the drill chuck is externally mounted with an external dustproof system, the outer dustproof system includes a sealing member and a fixed head, the fixed head is assembled at a front portion of the drill chuck, and the sealing member is assembled on the electric hammer drill bit. Outer wall.

The drill chuck is internally provided with an internal dustproof system, and the inner dustproof system includes a sealing member and a fixing sleeve. The sealing member is sleeved on an outer wall of the electric hammer drill bit, and the fixing sleeve is located at an inner wall of the drill chuck.

The beneficial effects of the invention are mainly manifested in: the connection between the fuselage part and the drill chuck through various fixed manners, realizes that a power tool can directly mount the hammer hammer drill bit without disassembling the drill chuck. Different drill bits enable easy and fast drilling operations and improve work efficiency. With fixed connection devices, various types of drill chucks can be quickly mounted to or removed from power tools. Easy to operate and fast.

DRAWINGS Fig. 2B is a structural view showing a conventional electric hammer clamping ordinary twist drill.

Figure 3 is a perspective view of a power tool in accordance with a preferred embodiment of the present invention, showing the machine head divided into a wrench drill chuck.

Figure 4 is a perspective view of the power tool of the present invention showing the machine head divided into hand-tight drill chucks.

Figure 5 is a top plan view of the power tool of Figure 3.

Figure 6 is a plan view of the power tool of Figure 4.

Figure 7 is a structural view of the power tool of Figure 3, showing the machine head divided into a wrench type drill chuck.

Figure 7A is a cross-sectional view of the power tool of Figure 5 taken along the line A-A, showing the nose portion as a wrench drill chuck.

Figure 7B is a partial perspective view of the structural view of the power tool of Figure 3 showing the connection of the wrench drill chuck and the rotating sleeve in the form of a key.

Figure 8 is a structural view of the power tool of Figure 4, showing the machine head divided into hand-tight drill chucks.

Figure 8A is a cross-sectional view of the power tool of Figure 6 taken along the line A-A, showing the hand portion as a hand-tight drill chuck.

Figure 8B is a partial perspective view of the structural view of the power tool of Figure 6, showing the connection of the hand-tight drill chuck to the rotating sleeve retaining means in the form of a key.

Fig. 9 is a structural view showing a power tool according to a second embodiment of the present invention, in which the body portion and the head portion (drill chuck) fixing means are screwed.

Fig. 9A is a cross-sectional view showing a power tool according to a second embodiment of the present invention.

Figure 9B is a partial perspective view of the structural view of the power tool of Figure 9 showing the connection of the wrench-type drill chuck to the rotating sleeve retaining means in the form of a thread. Figure 10 is a structural view of a power tool according to a third embodiment of the present invention, showing a conical connection between a fuselage portion and a nose portion (drill chuck) fixing device.

Fig. 10A is a cross-sectional view showing a power tool according to a third embodiment of the present invention.

Figure 10B is a partial perspective view of the structural view of the power tool of Figure 10, showing the tapered engagement of the wrench-type drill chuck and the rotating sleeve fixture.

Fig. 11 is a structural view showing a power tool according to a fourth embodiment of the present invention, in which the body portion and the head portion (drill chuck) fixing means are pinned.

Fig. 11A is a cross-sectional view showing a power tool according to a fourth embodiment of the present invention.

Figure 11B is a partial perspective view of the structural view of the power tool of Figure 11 showing the pin hand drill chuck and the rotating sleeve fixture being pinned.

Fig. 12 is a perspective view showing the electric power tool of the present invention for holding a conventional twist drill, in which the head portion (wrench type drill chuck) is held by a conventional twist drill.

Fig. 12A is a cross-sectional view showing the electric power tool of the present invention for holding a conventional twist drill, in which the head portion (wrench type drill chuck) is held by a conventional twist drill.

detailed description

The present invention will be further described in detail below in conjunction with the drawings and specific embodiments. Referring to FIG. 3 to FIG. 12A, a new type of electric hammer includes a fuselage 23, and a driving motor, a gear transmission mechanism, a rotating sleeve 39 and an impact mechanism 42 are mounted in the body 23, and the driving motor and the gear transmission mechanism are provided. The input end of the gear transmission is connected to the rotating sleeve 39. The power tool further includes a drill chuck 22, the drill chuck 22 is hollow, and the drill chuck 22 is fixedly connected. Mounted on the rotating sleeve 39, the drill chuck 22 is provided with a through hole through which the power hammer bit 21 passes, the electric hammer bit is installed in the rotating sleeve 39, and the impact mechanism 42 is located in the electric Behind the hammer bit 21, the outer wall of the drill chuck is provided with a clamping member for holding an electric drill bit, and the clamping member can be assembled Other drill bits such as twist drills.

The drill chuck is a hand-tight drill chuck and a wrench drill chuck with a clamping gauge of 6-20 mm. The above are two common ways. Of course, other ways can be implemented.

Figure 3 illustrates a power tool 20 in a preferred embodiment of the present invention. Referring now to Figures 3 and 5, Figure 7, Figure 7A power tool 20 includes a fuselage 23 and a drill chuck 22, a motor 27 is disposed within the fuselage 23, and a switch 24 is mounted external to the fuselage 23 for operation by a user The switch 24 controls the opening and closing of the motor 27. In the present embodiment, the power tool 20 includes an AC power cord 25 extending from the fuselage section 23 to supply power to the motor via an external AC power source. Of course, other methods of powering the motor, such as a DC power source, may also be considered. The electric hammer bit 21 passes through the inner through hole of the drill chuck 22 and is directly fitted into the rotary sleeve 39 of the body portion 23. The movement of the motor 27 can be transmitted to the hammer bit 21 by an internal motion transmission mechanism, thereby driving the hammer bit 21 to operate the object. In this embodiment, the fuselage portion 23 and the drill chuck 22 may be two members that are independent of each other, or may be a single member that is integrated together.

Referring to Figures 3, 5, 7 and 7A, the nose portion is shown divided into a wrench-type drill chuck 22. The clamping specifications include: 6-20mm, the specific clamping size specifications are 6mm, 10mm, 13mm, 20mm. Referring to Figure 5B, there is shown a toggle connection between the wrench and the swivel sleeve.

Referring to Figures 4, 6, 6, and 8A, the nose portion is shown divided into a hand-tight drill chuck 26. The clamping specifications include: 6-20mm, the specific clamping size specifications are 6mm, 10mm, 13mm, 20mm. Referring to Figure 6B, there is shown a hand-tight drill chuck and a swivel sleeve in a keyed connection.

Referring to FIGS. 7 and 7A, a motor 27 drives the first gear 40, the second gear 41, The third gear 43, the fourth gear 44, the rotating sleeve 39, and the drill chuck 22 output torque to realize the rotary motion of the hammer bit 21. At the same time, the impact mechanism 42 is driven to reciprocate the piston 51 in the cylinder 52, so that the hammer 50 continuously strikes the hammer bit 21.

Referring to Figures 7 and 7A, the fixing sleeve 36 is pressed, and the drill chuck 22 is attached to the rotating sleeve 39 of the body portion 23 by means of a key. The drill chuck 22 is coupled to the rotating sleeve 39 to transmit torque for rotational movement, while the pin 33 is used to axially secure the drill chuck 22 and the rotating sleeve 39 to prevent the drill chuck 22 from coming loose.

7 and 7A show that the front end of the drill chuck 22 has a dustproof system fixed to the drill chuck 22. In the dustproof system, the fixing head 30 has a double sealing member 31 and a hammer bit 21 for dustproofing. The fixed head is fixed to the drill chuck 22. Preventing dust and foreign matter from intruding during work to damage the drill chuck 22, causing the drill chuck 22 to be unable to hold other drills. Figure 7 and Figure 7A show that the drill chuck 22 has a dustproof system inside, internal protection The dust system includes a sealing member 34 and a fixing sleeve 35 that cooperates with the hammer bit 21 to prevent dust. Preventing dust, foreign matter and oil from the outside of the machine 23 from infiltrating into the drill chuck 22 during operation, causing the drill chuck 22 not to hold other drill bits.

As shown in Fig. 7A, in the present embodiment, in order to facilitate various specifications of the electric hammer drill bit, it can be assembled to the body through the through hole of the wrench drill chuck. At the same time, there is sufficient working drilling depth for the assembled hammer bit.

Preferably, the distance D from the foremost end portion of the wrench bit to the fuselage portion is 67 mm, and generally, the distance D ranges from 40 mm to 100 mm. For the convenience of the nose part

(handle type drill chuck) can be easily assembled to the fuselage. In this embodiment, preferably, the outer diameter C of the key portion of the connection between the nose portion (handle drill chuck) and the rotating sleeve key is 15.5. Mm, generally, the outer diameter D ranges from 12 mm to 50 mm. As shown in Fig. 8A, in order to facilitate various specifications of the electric hammer drill bit, it can be assembled to the body through the through hole of the hand-tight drill chuck. At the same time, there is sufficient working drilling depth for the assembled hammer drill. Preferably, the distance D1 from the foremost end portion of the hand-tight drill chuck to the fuselage portion is 68 mm, and generally, the distance D1 ranges from 40 mm to 100 mm. In order to facilitate the hand-tight drill chuck to be easily assembled to the body, in this embodiment, preferably, the key outer diameter C of the connection between the hand-tight drill chuck and the rotating sleeve key is 15.5 mm, generally, outside The diameter C ranges from 12 mm to 50 mm.

Pressing the fixing sleeve 36, the electric hammer bit 21 is directly fitted into the rotating sleeve 39 through the inner through hole of the drill chuck 22, and is axially fixed in the rotating sleeve 39 by the cylindrical pin 32, so that the hammer bit 21 is not loosened. Take off. When the fixing sleeve 36 is loosened, the fixing sleeve 36 is automatically reset by the return spring 38, and the fixing ring 37 in the fixing sleeve 36 simultaneously blocks the pin 33 of the axially fixed working head and the cylindrical pin 32 of the axial fixed electric hammer bit 21 to prevent The pin 33 is loose from the cylindrical pin 32.

When it is necessary to remove the hammer bit 21 from the whole machine 20, the fixing sleeve 36 is first pressed, and the fixing sleeve 36 and the fixing ring 37 are moved downward against the elastic force of the return spring 38. When the fixing sleeve 36 is moved downward, the cylindrical pin 32 of the axially fixed hammer bit 21 can be moved outward, and the hammer bit 21 can be pulled out at this time.

When it is necessary to remove the drill chuck 22 from the complete machine 20, the fixing sleeve 36 is first pressed, and the fixing sleeve 36 and the fixing ring 37 are moved downward against the elastic force of the return spring 38. When the fixing sleeve 36 is moved downward, the pin 33 of the drill chuck 22 is axially fixed, and the drill chuck 22 can be removed conveniently and quickly after the pin 33 is removed.

9, FIG. 9A and FIG. 9B show still another embodiment in which the drill chuck 22 and the fuselage portion 23 are fixed by screwing, and the hammer bit 21 is directly assembled through the inner through hole of the drill chuck 22. The function of the hammer is achieved by turning into the rotating sleeve 39 on the fuselage portion 23. As shown in Fig. 7A, in order to facilitate the drilling chuck, it can be easily assembled to the body. Optimal The thread outer diameter E of the threaded connection of the drill chuck to the rotary sleeve is 14 mm, and generally, the thread outer diameter E ranges from 12 mm to 50 mm.

10, FIG. 10A and FIG. 10B show still another embodiment in which the rotary chuck 29 and the rotary sleeve 39 in the fuselage portion 23 are fixed by a tapered connection while the hammer bit 21 passes through the drill chuck 22 The inner through hole is directly fitted into the rotary sleeve 39 on the fuselage portion 23, and the electric hammer is fixed by axially fixing the electric hammer drill to the rotary sleeve 39 through the steel ball 48. As shown in Fig. 8A, in order to facilitate the drilling chuck, it can be easily assembled to the body.

Preferably, the tapered surface of the drill chuck and the rotating sleeve has a large diameter C of 15.5 mm, and generally, the outer diameter C of the tapered surface ranges from 12 mm to 50 mm.

Figure 11, Figure 11A and Figure 11B show yet another embodiment in which the drill chuck 22 and the rotating sleeve 39 in the fuselage portion 23 are fixed by means of a pin connection while the hammer bit 21 passes through the drill chuck 22. The inner through hole is directly fitted into the rotary sleeve 39 on the fuselage portion 23, and the cylindrical hammer pin 32 is used to axially fix the electric hammer bit to the rotary sleeve 39 to realize the function of the hammer. As shown in Fig. 9A, in order to facilitate the drilling chuck, it can be easily assembled to the body. Preferably, the outer diameter C of the drill chuck and the rotating sleeve pin connection form is 15.5 mm, and generally, the outer diameter C ranges from 12 mm to 50 mm.

3, FIG. 4, FIG. 7A and FIG. 8A show that the electric tool of the present invention can directly assemble the electric hammer bit 21 through the inner through hole of the drill chuck 22 to the fuselage 23 without disassembling the drill chuck 22. Drilling operation with hammer function. Figures 12 and 12A show the drill chuck 22 directly gripping the conventional twist drill bit 100.

1A and 1B show a conventional electric hammer holding electric hammer drill. 2, FIG. 2A, FIG. 2B show that the ordinary electric hammer needs to be additionally connected with the drill chuck 101 by the connecting rod 102, and then assembled on the electric hammer, and then the twist drill bit 100 or other drill bit is clamped on the drill chuck to realize Drilling operations. 3A, FIG. 7A, FIG. 7A, FIG. 12 and FIG. 12A with the conventional electric hammer, FIG. 1A, FIG. 1B, FIG. 2, FIG. 2A and FIG. 2B can embody the present invention in comparison with a conventional electric hammer. A variety of drill bits are not only convenient, quick, but also improve work efficiency while improving accuracy.

In the above embodiment, various kinds of fixed connection devices of various keys, threads, tapers and pins of the drill chuck and the fuselage portion have been described, and those skilled in the art can also think of using other fixing devices to realize the present. In the embodiment, the drill chuck is connected to the fuselage, and the electric hammer drill bit is directly assembled into the rotating sleeve of the fuselage portion through the inner through hole of the drill chuck to finally realize the drilling function of the electric hammer. The fixing device is not limited to the mechanical structure, and may be other devices that achieve a fixed holding function by magnetic force or the like.

The power tool disclosed in the present invention is not limited to the contents described in the above embodiments and the structures shown in the drawings. Obvious modifications, substitutions, or alterations to the shapes and positions of the components may be made without departing from the scope of the invention.

Claims

Claim

A new type of electric hammer, comprising a fuselage, wherein a driving motor, a gear transmission mechanism, a rotating sleeve and an impact mechanism are mounted in the fuselage, the driving motor is connected to an input end of the gear transmission mechanism, and the gear transmission mechanism is The output end is connected to the rotating sleeve, wherein: the power tool further comprises a drill chuck, the drill chuck is hollow, and the drill chuck is mounted on the rotating sleeve by a fixed connecting device, the drill The collet is provided with a through hole through which the power hammer bit passes, the electric hammer bit is installed in the rotating sleeve, the impact mechanism is located behind the electric hammer bit; and the outer wall of the drill chuck is provided with a clamping electric drill The clamping part of the drill bit.

2. The novel electric hammer according to claim 1, wherein: the drill chuck is a hand-tight drill chuck and a wrench-type drill chuck having a clamping gauge of between 6 and 20 mm.

The novel electric hammer according to claim 1 or 2, wherein: the fixed connecting device comprises a spline and a keyway, the outer wall of the rotating sleeve is provided with a spline, and the inner wall of the drill chuck is provided with The spline-fitted keyway, the spline being nested within the keyway.

The new type of electric hammer according to claim 3, wherein: the rotating sleeve has a first pin hole, and the drill chuck has a second pin hole, and the fixing pin is sequentially mounted on the a first pin hole is formed in the rotating sleeve, the second cylindrical pin hole is opened in the rotating chuck, and the cylindrical pin is sequentially mounted on the first cylindrical pin hole And the second cylindrical pin hole.

The electric hammer according to claim 1 or 2, wherein: the fixed connecting device comprises an internal thread and an external thread, and an outer wall of the rotating sleeve is provided with an external thread, and an inner wall of the drill chuck is provided An internal thread that cooperates with the external thread, the external thread being mounted within the internal thread.

The novel electric hammer according to claim 1 or 2, wherein: said fixed connection The inner surface of the rotating sleeve is provided with an outer tapered surface, and the inner wall of the drill chuck is provided with an inner tapered surface that cooperates with the outer tapered surface, and the outer tapered surface is installed at the inner surface Said inside the cone.

The new type of electric hammer according to claim 1 or 2, wherein: the fixed connecting device comprises a pin, the outer wall of the rotating sleeve is set on an inner wall of the drill chuck, and the rotating sleeve is opened a pin hole, the drill chuck is provided with a second pin hole, the pin is sequentially installed in the first pin hole and the second pin hole; the rotating sleeve is further provided with a first cylindrical pin hole, The drill chuck is provided with a second cylindrical pin hole, and the cylindrical pin is sequentially installed in the first cylindrical pin hole and the second cylindrical pin hole.

The new type of electric hammer according to claim 1 or 2, wherein: the fixing sleeve is located at the rear of the drill chuck and is disposed on the drill chuck and the rotating sleeve, and the fixing sleeve is provided with a fixing ring. One end of the return spring is mounted on the fixed ring, and the other end of the return spring is mounted on the rotating sleeve, and the fixing sleeve simultaneously blocks the pin of the axial positioning drill chuck and the rotating sleeve and the cylindrical pin of the axial positioning electric hammer drill bit Or steel ball.

The novel electric hammer according to claim 1 or 2, wherein: the drill chuck is externally mounted with an external dustproof system, and the external dustproof system includes a sealing member and a fixing head, and the fixing head is assembled At the front of the drill chuck, the sealing element is fitted over the outer wall of the hammer bit.

10. The novel electric hammer according to claim 1 or 2, wherein: the drill chuck is internally provided with an internal dustproof system, and the inner dustproof system comprises a sealing member and a fixing sleeve, and the sealing member is set in the electric An outer wall of the hammer bit, the fixing sleeve being located on an inner wall of the drill chuck.

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