Quick connection device for a power tool and power tool

Abstract

The application discloses a quick connecting device for electric tools, which comprises a sleeve provided with a first sliding groove, the first sliding groove having a locking part extending in a circumferential direction and an unlocking part extending in an axial direction; a rotating base fixedly connected with the sleeve in the axial direction and capable of rotating relative to the sleeve in the circumferential direction, the rotating base having a positioning pin for cooperating with a tool head; a centering shaft synchronously rotating with the rotating base and capable of linearly moving relative to the rotating base in the axial direction, the centering shaft having a first connecting end for connecting with a body of the electric tool and a second connecting end for connecting with the tool head in the axial direction; and a sliding pin; when the sliding pin slides from the locking part to the unlocking part of the first sliding groove, the centering shaft can move relative to the rotating base along the axial direction, and when the sliding pin is located at a first terminal position of the unlocking part, the second connecting end extends relative to the positioning pin and can be used for connecting with the tool head; when the sliding pin is located at a second terminal position of the locking part, the second connecting end is in a stable state of being retracted relative to the positioning pin.

Description

Technical Field

[0001] This invention relates to a connecting device, and more particularly to a connecting device for connecting between the body of a power tool and the tool head. Background Technology

[0002] The use of power tools often involves assembling the tool head with the power tool body. That is, when operation is needed, the tool head is attached to the power tool body, and then the motor of the power tool body drives the tool head to perform the relevant operation. When attaching the tool head to the power tool body, an intermediate connecting device is usually required.

[0003] For example, a hole saw is connected to the power tool body via a spindle system, which transmits the rotation of the motor shaft to the hole saw.

[0004] Current connection devices suffer from drawbacks such as complex structure, inconvenient use, and unstable power transmission. Summary of the Invention

[0005] One of the objectives of this invention is to provide a quick-connect device for power tools, which enables the rapid assembly of the tool head and the power tool. It has a simple structure, is easy to operate, and can stably transmit the rotation output of the power tool to the tool head.

[0006] To achieve the above objectives, the present invention provides a quick-connect device for power tools, which is used to connect the power tool body and the tool head; the quick-connect device includes:

[0007] The sleeve has a first groove on its circumferential wall, the first groove having a locking part extending in the circumferential direction and an unlocking part extending in the axial direction.

[0008] A rotating base is fixedly connected to a sleeve in the axial direction and can rotate relative to the sleeve in the circumferential direction. The axial end face of the rotating base has a positioning pin extending from the axial end face toward the tool head side for cooperating with the tool head. The circumferential wall of the rotating base is provided with a second sliding groove extending in the axial direction.

[0009] A centering shaft is provided, which passes through the axial center hole of the rotating base. The centering shaft is provided to rotate synchronously with the rotating base and is capable of linearly moving relative to the rotating base in the axial direction. The centering shaft has a first connecting end for connecting to the power tool body and a second connecting end for connecting to the tool head in the axial direction.

[0010] A sliding pin, the tail end of which is connected to the centering shaft, passes through the second sliding groove so that its head end is located in the first sliding groove;

[0011] When the sliding pin slides from the locking part of the first groove to the unlocking part, the centering shaft can move axially relative to the rotating base. When the sliding pin is at the first end position of the unlocking part, the second connecting end extends relative to the positioning pin and can be used to connect with the tool head. When the sliding pin is at the second end position of the locking part, the second connecting end is in a stable state of retraction relative to the positioning pin.

[0012] Another objective of this invention is to provide a power tool that enables rapid assembly of the tool head and the power tool body, and that has a simple structure and is easy to use.

[0013] Based on the above-mentioned objectives, the present invention also provides an electric tool, which includes an electric tool body and a quick-connect device as described above, wherein the first connecting end is connected to the electric tool body.

[0014] The quick-connect device for power tools described in this invention has a simple structure, is easy to operate, and is inexpensive. It enables quick assembly of the tool head and the power tool, while also ensuring that the rotation of the power tool is stably transmitted to the tool head. Attached Figure Description

[0015] Figure 1 A power tool is shown schematically.

[0016] Figure 2 A schematic diagram of the split structure of the quick connection device according to one embodiment of the present invention is shown.

[0017] Figure 3 The diagram partially illustrates the structure of the quick connection device according to one embodiment of the present invention.

[0018] Figure 4 A cross-sectional view of the quick connection device according to one embodiment of the present invention is shown.

[0019] Figure 5 This shows the state in which the sliding pin of the quick-connect device described in this invention is in the first terminal position in one embodiment. Detailed Implementation

[0020] The quick-connect device for power tools and the power tools described in this invention will be further explained and described below with reference to the accompanying drawings and specific embodiments. However, this explanation and description do not constitute an undue limitation on the technical solution of this invention.

[0021] The use of power tools often involves assembling the tool head with the power tool body. That is, when operation is required, the tool head is installed on the power tool body, and then the motor of the power tool body drives the tool head to move and perform the relevant operation.

[0022] For example, such as Figure 1 As shown, when it is necessary to install the tool head 200 onto the power tool body 100, it can be done through the connecting device 300 located between the power tool body and the tool head.

[0023] For example, a hole saw is connected to the power tool body via a spindle system, which transmits the rotation of the motor shaft to the hole saw for related operations.

[0024] Current connection devices suffer from drawbacks such as complex structure, inconvenient use, and unstable power transmission.

[0025] Based on this, in one embodiment of the present invention, a quick-connect device for power tools is provided, which has a simple structure, is convenient to use, and can stably transmit the rotational motion of the power tool to the tool head, ensuring that the tool head operates efficiently, safely and stably.

[0026] Figure 2 A schematic diagram of the split structure of the quick connection device according to one embodiment of the present invention is shown.

[0027] like Figure 2 As shown, in one embodiment, the quick-connect device for power tools includes:

[0028] The sleeve 1 has a first groove 11 on its circumferential wall. The first groove 11 has a locking part 111 extending in the circumferential direction and an unlocking part 112 extending in the axial direction.

[0029] A rotating base 2 is partially inserted into a sleeve 1. The rotating base 2 is fixedly connected to the sleeve in the axial direction, but can rotate relative to the sleeve 1 in the circumferential direction. A locating pin 22 extends from the axial end face 21 of the rotating base 2 towards the tool head side, and the locating pin 22 engages with the tool head. The rotating base 2 has an axial center hole 23. Furthermore, as... Figure 3 As shown, the circumferential wall of the rotating base 2 is provided with a second groove 24 extending in the axial direction.

[0030] A centering shaft 3 is provided, which passes through the axial center hole 23 of the rotating base 2. The centering shaft 3 is provided to rotate synchronously with the rotating base 2 and is capable of linear movement relative to the rotating base 2 in the axial direction. The centering shaft 3 has a first connecting end 31 for connecting with the power tool body and a second connecting end 32 for connecting with the tool head in the axial direction.

[0031] It should be noted that the aforementioned axial direction includes the direction of the central axis of the quick-connect device and the direction parallel to the central axis.

[0032] like Figure 2 and Figure 4 As shown, the sliding pin 4 has its tail end connected to the centering shaft 3, and the sliding pin 4 passes through the second sliding groove 24 so that its head end is located in the first sliding groove 11. In some more specific embodiments, the tail end of the sliding pin 4 can be integrally fixedly connected to the centering shaft by an interference fit.

[0033] With this configuration, when the sliding pin 4 is in the locking part 111 of the first slide groove 11, the sliding pin 4 and the centering shaft 3 fixedly connected to the tail end of the sliding pin 4 cannot move in the axial direction. When the sliding pin 4 slides from the locking part 111 of the first slide groove 11 to the unlocking part 112, the centering shaft 3 can move axially relative to the rotating base. When the sliding pin is in the first end position 113 of the unlocking part, the sliding pin 4 abuts against the end position of the unlocking part and remains stable. The second connecting end 32 of the centering shaft 3 extends relative to the positioning pin 22 and can be used to connect with the tool head. After connecting with the tool head, when the sliding pin 4 returns to the locking part and is in the second end position of the locking part, the second connecting end 32 of the centering shaft 3 is in a stable state of retraction relative to the positioning pin 22.

[0034] Specifically, in some implementations, in the initial state where there is no need to assemble the tool head, the second connecting end 32 of the centering shaft 3 can be in the following position: Figure 4 As shown, the axial end face 321 of the second connecting end 32 does not protrude significantly from the axial end face 221 of the locating pin 22. At this time, because the second connecting end 32 is retracted into the locating pin 22, and due to the interference of the locating pin, the second connecting end 32 cannot be inserted into the connecting hole of the tool head (e.g., a hole saw) and connected to the connecting hole of the tool head.

[0035] In this state, if a tool head needs to be assembled, the operator can apply external force to the sleeve 1, causing the sleeve 1 to rotate relative to the rotating base 2 and the centering shaft 3. This causes the sliding pin 4 to slide along the locking part 111 of the first slide groove 11 until the sliding pin 4 disengages from the locking part 111 and slides to the unlocking part 112. At this time, the centering shaft 3 can move axially relative to the rotating base 2. In this state, the operator can push the sleeve and the rotating base 2, which is fixedly connected to it in the axial direction, towards the power tool body side P2 in the axial direction, so that the centering shaft 3 moves axially relative to the rotating base 2 towards the tool head side P1 in the axial direction. During this process, the sliding pin 4 also moves towards the tool head side within the unlocking part 112. Figure 5As shown, when the sliding pin 4 moves to the first terminal position 113, it abuts against the first terminal position and remains stable. At this time, the second connecting end 32 of the centering shaft 3 extends relative to the positioning pin 22 (for example, the threaded section of the second connecting end is completely outside the positioning pin), and the second connecting end 32 can be inserted into the connecting hole of the tool head to achieve connection with the tool head. At this time, the tool head 200 (for example, a hole saw) can be screwed onto the second connecting end 32.

[0036] After the second connecting end 32 is connected to the tool head, the sliding pin 4 can be moved away from the terminal position 113 of the unlocking part in the first sliding groove 11. At this time, the centering shaft 3 will move relative to the rotating base 2 along the axial direction toward the power tool body side P2, so that the second connecting end 32 retracts relative to the positioning pin 22, that is, the positioning pin 22 extends relative to the second connecting end 32. At this time, the positioning pin 22 can be smoothly and quickly inserted into the positioning hole of the tool head 200 that matches it, so that the rotation output by the power tool is stably transmitted to the tool head. This ensures the machining accuracy on the one hand, and also plays a role in shock absorption on the other hand.

[0037] In some more specific implementations, such as Figure 4 As shown, in the initial state where there is no need to assemble the tool head, and in the working state of the power tool where the tool head has been installed on the power tool body, the sliding pin 4 is located at the second end position 114 of the locking part 111 of the first sliding groove 11. At this time, the axial end face 321 of the second connecting end 32 is basically flush with the axial end face 221 of the positioning pin 22.

[0038] Alternatively, in some other more specific embodiments, when the sliding pin 4 is located at the second end position 114 of the locking part 111 of the first sliding groove 11, in the initial state where there is no need to assemble the tool head, and in the working state of the power tool with the tool head already installed on the power tool body, the axial end face of the second connecting end 32 may be closer to the power tool body side P2 relative to the axial end face of the positioning pin.

[0039] It should be noted that the retraction of the second connecting end 32 relative to the positioning pin 22 mentioned in this invention is not limited to the axial end face 321 of the second connecting end 32 necessarily being closer to the power tool body side P2 than the axial end face 221 of the positioning pin 22. Rather, it means that compared to the state where the sliding pin is in the first terminal position 113, when the sliding pin is in the second terminal position 114, the second connecting end 32 moves relative to the positioning pin 22 toward the power tool body side P2.

[0040] Therefore, in some alternative embodiments, in the initial state where there is no need to assemble the tool head, and in the working state of the power tool where the tool head has been installed on the power tool body, the axial end face 321 of the second connecting end 32 may be slightly closer to the tool head side P1 relative to the axial end face 221 of the locating pin 22, but does not extend significantly in this direction. Therefore, the second connecting end does not yet have a connecting section with a certain axial length that can be stably connected to the tool head.

[0041] In some more specific implementations, such as Figure 2 As shown, the second connecting end is provided with a threaded connecting section 323.

[0042] In some more specific embodiments, the fixed connection between the rotating base 2 and the sleeve 1 in the axial direction can be achieved by a limiting element in the axial direction.

[0043] For example, in some more specific implementations, such as Figure 4 As shown, one end of the rotating base 2 has a shaft end cap 25 with an axial cross-sectional area greater than or equal to that of the sleeve, so that the rotating base can be placed on the sleeve and cannot move further relative to the sleeve toward the power tool body side P2. At the other end, the rotating base 2 can be axially limited to the sleeve by a snap ring 6.

[0044] Furthermore, in some more specific embodiments, the synchronous rotation of the centering shaft 3 and the rotating base 2 in the circumferential direction can be achieved by the shape matching between the outer circumferential wall of the centering shaft 3 and the axial central hole 23 of the rotating base 2.

[0045] For example, in some more specific embodiments, the outer circumferential wall of the centering shaft 3 can be prismatic, such as hexagonal, and correspondingly, the portion of the axial central hole that mates with this section of the outer circumferential wall is also prismatic, such as hexagonal.

[0046] In some more specific implementations, such as Figure 2 As shown, the first groove 11 can be constructed as an L-shape.

[0047] Of course, in some other more specific embodiments, the first groove 11 may also be a groove of other shapes having a certain circumferential extension length and an axial extension length.

[0048] In some more specific implementations, such as Figure 2 As shown, to further improve the stability of the rotation output from the power tool body to the tool head, multiple locating pins 22 can be provided, for example, at least including... Figure 2As shown in the two examples, and more preferably, these multiple locating pins can be arranged on the same concentric circle concentric with the centering shaft to balance the transmission of force and torque.

[0049] In some specific implementations, to further improve operational convenience and enhance the user experience, such as... Figure 2 As shown, the quick-connect device may also include an elastic element 5 disposed between the sleeve 1 and the rotating base 2 to apply an elastic force in the circumferential direction.

[0050] In some more specific embodiments, the elastic element 5 may include a torsion spring having at least two legs to abut against the inner wall of the sleeve and the rotating base, respectively, to apply an elastic force in the circumferential direction.

[0051] With this setup, after the operator completes the connection between the second connection end and the tool head, they push the sleeve 1 toward the power tool body side P2. When the sliding pin 4 just slides to the locking part 111 of the slide groove, the operator releases the sleeve, and the sleeve will automatically and quickly reset under the elastic force of the elastic element 5, thereby causing the sliding pin to quickly slide to the stable second end position 114.

[0052] In some more specific embodiments, the quick-connect device also includes a guide drill bit ( Figures 2 to 5 (Not shown in the image), which is connected to the connecting hole 322 at the second connecting end of the centering shaft, and is used to create a guide hole on the workpiece to cooperate with the tool head for precise cutting.

[0053] In another embodiment of the present invention, a power tool is also provided, which includes a power tool body 100 and a quick-connect device as described above connected to the power tool body 100. One end of the quick-connect device is connected to the power tool body in the axial direction, and the other end in the axial direction is connected to the tool head 200.

[0054] In some more specific implementations, the tool head may include a hole saw.

[0055] It should be noted that the quick connection device described in this invention is not limited to hole saws; it can also be applied to other power tools whose body outputs rotation to the tool head.

[0056] Therefore, the quick-connect device for power tools described in this invention greatly improves the ease of operation for assembling the tool head and the power tool through a simple structural design. Furthermore, while enabling quick assembly of the tool head and the power tool, it also allows the power tool to transmit rotation to the tool head with extremely high stability, thereby ensuring the effectiveness of the power tool while greatly enhancing the user experience.

[0057] It should be noted that the prior art portion within the scope of protection of this invention is not limited to the embodiments given in this invention. All prior art that does not contradict the solution of this invention, including but not limited to prior patent documents, prior publications, prior public uses, etc., can be included within the scope of protection of this invention.

[0058] Furthermore, the combination of the technical features in this case is not limited to the combination methods described in the claims of this case or the combination methods described in the specific embodiments. All technical features described in this case can be freely combined or combined in any way, unless they contradict each other.

[0059] It should also be noted that the embodiments listed above are merely specific embodiments of the present invention. Obviously, the present invention is not limited to the above embodiments, and similar changes or modifications made thereto are those that can be directly derived or easily conceived by those skilled in the art from the content disclosed in the present invention, and should all fall within the protection scope of the present invention.

Claims

1. A quick-connect device for power tools, used for connecting between the power tool body (100) and the tool head (200); characterized in that, The quick connection device includes: The sleeve (1) has a first groove (11) on its circumferential wall. The first groove has a locking part (111) extending in the circumferential direction and an unlocking part (112) extending in the axial direction. A rotating base (2) is fixedly connected to the sleeve in the axial direction and can rotate relative to the sleeve in the circumferential direction. The axial end face (21) of the rotating base has a positioning pin (22) extending from the axial end face toward the tool head side for cooperating with the tool head. The circumferential wall of the rotating base is provided with a second sliding groove (24) extending in the axial direction. A centering shaft (3) is provided, which passes through the axial center hole (23) of the rotating base. The centering shaft is provided to rotate synchronously with the rotating base and is capable of linearly moving relative to the rotating base in the axial direction. The centering shaft has a first connecting end (31) for connecting with the power tool body and a second connecting end (32) for connecting with the tool head in the axial direction. The sliding pin (4) has its tail end connected to the centering shaft, and the sliding pin passes through the second sliding groove so that its head end is located in the first sliding groove; When the sliding pin slides from the locking part of the first groove to the unlocking part, the centering shaft can move axially relative to the rotating base, and when the sliding pin is at the first end position (113) of the unlocking part, the second connecting end extends relative to the positioning pin and can be used to connect with the tool head; when the sliding pin is at the second end position (114) of the locking part, the second connecting end is in a stable state of retraction relative to the positioning pin.

2. The quick connection device as described in claim 1, characterized in that, When the sliding pin is in the second terminal position, the axial end face of the second connecting end is closer to the tool body side than the axial end face of the positioning pin; or the axial end face of the second connecting end is flush with the axial end face of the positioning pin.

3. The quick connection device as described in claim 1, characterized in that, The first groove is constructed in an L-shape.

4. The quick connection device as described in claim 1, characterized in that, It also includes an elastic element (5) disposed between the sleeve and the rotating base to apply an elastic force in the circumferential direction.

5. The quick connection device as described in claim 1, characterized in that, The locating pins include at least two, which are arranged on the same concentric circle concentric with the centering shaft.

6. The quick connection device as described in claim 1, characterized in that, The second connecting end is provided with a threaded connecting section (323).

7. The quick connection device as described in claim 1, characterized in that, The outer circumferential wall of the centering shaft is shaped to match the axial central hole of the rotating base, so as to achieve synchronous rotation of the centering shaft and the rotating base.

8. The quick connection device as described in claim 1, characterized in that, It also includes a guide drill bit, which is connected to the connecting hole of the second connecting end of the centering shaft.

9. A power tool comprising a power tool body, characterized in that, It also includes a quick-connect device as described in any one of claims 1-8, wherein the first connection end is connected to the power tool body.

10. The power tool as claimed in claim 9, characterized in that, It also includes a tool head, which includes a hole saw.

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