An automatic clamping drill chuck

Abstract

This invention provides an automatically clamping drill chuck, including a coil, multiple jaws, a main body, and a clutch connection mechanism. The clutch connection mechanism is equipped with a locking element that connects to the non-rotating part of the front end of a power tool. With the drill bit head facing upwards as a reference position, the locking element is vertically movably positioned at the rear of the main body. The clutch connection mechanism also includes a synchronous rotation component connected to the coil. Between the synchronous rotation component and the locking element is a component that controls the locking element to rise and disengage from the front end of the power tool. The clutch connection mechanism also includes a reset component. For drill chucks with a chuck structure, this invention can automatically clamp the drill bit using the power of a power tool.

Description

Technical Field

[0001] This utility model relates to an automatic clamping drill chuck, and more particularly to a drill chuck for use in handheld power tools. Background Technology

[0002] For drill chucks used in handheld power tools, there is a type that uses a chuck structure, that is, a screw drive. When clamping a drill bit, one hand needs to hold the drill bit and the other hand needs to rotate the screw to clamp the drill bit. Since the drill chuck is assembled with the power tool, the operation of clamping the drill bit is very inconvenient. Utility Model Content

[0003] The purpose of this invention is to provide an automatically clamping drill chuck that can automatically clamp the drill bit using the power of a power tool for drill chucks with a chuck structure. To this end, this invention adopts the following technical solution: An automatic clamping drill chuck includes a coil, multiple jaws, and a main body. The main body has jaw grooves corresponding to the jaws. The multiple jaws are slidably mounted on their respective jaw grooves. The jaws are connected to the coil and can radially contract to clamp the drill bit and radially expand to release the drill bit under the action of the coil. The drill chuck is characterized by a clutch connection mechanism, which includes a locking element that connects to the non-rotating part of the front end of a power tool. With the drill bit head facing upwards as a reference position, the locking element is vertically detachable at the rear of the main body. The clutch connection mechanism also includes a synchronous rotation component connected to the coil. Between the synchronous rotation component and the locking element is a component that controls the locking element to rise and disengage from the front end of the power tool. The clutch connection mechanism also includes a reset component.

[0004] Based on the above technical solutions, the present invention may also adopt the following further technical solutions, or combine these further technical solutions: The drill chuck has a switchable first connection position and a second connection position for the locking member. The first connection position is located above the second connection position and is used to raise the locking member to a height that is disconnected from the non-rotating part of the power tool and fix it when the drill chuck is installed on the power tool, and to position it at the working height when in working condition.

[0005] The locking component includes a ring body and a lock head disposed at the rear end of the ring body, the ring body being fitted over the main body.

[0006] The synchronous rotation assembly includes a sleeve that fits over the drill body. Its front end is connected to the coiled wire and can rotate together with it. Multiple ball-pushing grooves are arranged on its surface along the circumferential direction. The assembly controlling the locking member to rise and disengage from the power tool's front end includes a control base corresponding to the lower part of the ball. The bottom of the ball rests on the control base, and its inner surface is located in the ball-pushing groove. A cam surface is arranged on the control base along the circumferential direction for the ball. The cam surface has a concave portion and a convex portion. The ball can be pushed and climbs onto the convex portion via the transition surface between the concave and convex portions, pushing the locking member upwards and disengaging it from the power tool's front end. During reset, the ball rotates together with the synchronous rotation assembly and falls into the concave portion. The locking member and the control base are connected circumferentially and rotate together.

[0007] The control chassis is circular and fits around the main body, and the brake ring and the locking ring are located around the outer edge of the sleeve of the synchronous rotation assembly.

[0008] The synchronous rotation assembly and control chassis are positioned axially.

[0009] The locking ring is provided with an inner ring body that receives pressure from the reset assembly. The inner ring body has an inner surface that mates with the ball bearings. The control chassis has an inner ring surface. The inner ring surface axially limits the sleeve of the synchronous rotation assembly at the rear end of the synchronous rotation assembly. The drill chuck is provided with a limiting member connected to the main body at the rear of the control chassis.

[0010] The locking component is provided with an inner ring body, the inner ring body has an inner surface that cooperates with the ball bearing, the reset component cooperates with the inner ring body, and the reset component presses the inner ring body downward based on the main body or the coil.

[0011] The locking ring body is connected to the inner ring body in an adjustable position, allowing the ring body to switch between a first connection position and a second connection position on the surface of the inner ring body. This is used to raise the ring body to a height that is disconnected from the non-rotating part of the power tool and fix it when the drill chuck is installed on the power tool, as well as to fix the relative position of the ring body and the inner ring body in the working state.

[0012] The ring body and the inner ring body are also positioned circumferentially by keyway engagement; the ring body is provided with a rearward-extending key, and the key, the inner ring body, and the control chassis are all connected by keyway engagement; one of the inner side of the locking member or the outer side of the inner ring body is provided with two annular slots as a first connection position and a second connection position, and the other of the inner side of the locking member or the outer side of the inner ring body is provided with a structure that engages with the annular slot; or, the inner side of the locking member is provided with two annular slots as a first connection position and a second connection position, the drill chuck is also provided with a positioning ring, the positioning ring is fitted on the main body, is located above the inner ring body and is pressed by the reset component, and the inner ring body is provided with a structure that engages with the annular slot.

[0013] In its normal state, this invention connects the locking mechanism and the screw thread together. The locking mechanism is connected to the non-rotating part of the power tool, thus connecting the screw thread to the non-rotating part of the power tool as well. At this time, the motor operates in the forward direction, and the power tool's output shaft drives the drill chuck body to rotate while the screw thread remains stationary, automatically clamping the drill bit. After clamping the drill bit, the screw thread can no longer rotate relative to the body. At this point, the screw thread is subjected to the driving force of the body, which is transmitted to the clutch mechanism, separating the locking mechanism from the power tool, completing the automatic clamping process, and allowing for normal operation. Furthermore, when releasing the drill chuck, reversing the screw thread operation allows the locking mechanism to reconnect to the non-rotating part of the power tool. The motor then operates in the reverse direction, automatically releasing the drill bit. This invention can also achieve active locking at the unlocking height without the clutch mechanism, facilitating the installation of the drill chuck and power tool, reducing the packaging volume of the drill chuck, and protecting and concealing the part connecting the locking mechanism and the motor during transportation. Attached Figure Description

[0014] Figure 1 This is an exploded view of the structure of an embodiment of the present utility model.

[0015] Figure 2 This is a cross-sectional view of an embodiment of the present invention in the connected state.

[0016] Figure 3 This is a schematic diagram of a portion of the clutch connection mechanism in the connected state according to an embodiment of the present invention.

[0017] Figure 4 This is a cross-sectional view of the embodiment of the present invention in the disassembled state.

[0018] Figure 5 This is a schematic diagram of a portion of the clutch connection mechanism in the disengaged state according to an embodiment of the present invention.

[0019] Figure 6 This is a cross-sectional view of the embodiment of the present invention when the drill chuck is installed.

[0020] Figure 7 A cross-sectional view showing another implementation of the present invention in the state of installing a drill chuck.

[0021] Figure 8 A cross-sectional view showing a third implementation of the present invention in the state of installing a drill chuck.

[0022] Figure 9 for Figure 8 A schematic diagram of the locking positioning ring in the embodiment shown. Detailed Implementation

[0023] Reference Figures 1-6 An automatic clamping drill chuck includes a coil 2, multiple jaws 3, and a body 1. The body 1 has jaw grooves 11 corresponding to the jaws 3. The multiple jaws 3 are slidably mounted on their respective jaw grooves 11. The coil 2 is rotatably positioned in the middle of the body 1. The bottoms of the multiple jaws 3 are connected to the coil 2 and can radially contract to clamp the drill bit and radially expand to release the drill bit under the action of the coil 2 along the jaw grooves 11. The body 1 has a hole 10 for power connection to a power tool spindle.

[0024] The drill chuck is also equipped with a clutch connection mechanism, which includes a locking element that can connect to a non-rotating part of the power tool's front end (such as a slot or hole). With the drill bit head facing upwards as a reference position, the locking element is vertically detachable at the rear of the main body. The clutch connection mechanism also includes a synchronous rotation assembly connected to the coil 2. Between the synchronous rotation assembly and the locking element is a component that controls the locking element to rise and disengage from the power tool's front end. The clutch connection mechanism also includes a reset component, ensuring that the locking element is always subjected to a downward (or backward) pushing force. The locking component includes a ring body 41 and a lock head 40 disposed at the rear end of the ring body, which may be a protruding post. The ring body 41 is fitted over the main body 1.

[0025] The synchronous rotation component is provided with a sleeve 5, which is fitted over the main body 1. Its front end is connected to the coil 2 and can rotate together, for example, by using a keyway connection. Multiple ball pushing grooves 51 are provided on its surface along the circumferential direction. The groove walls of the ball pushing grooves 51 form a structure that pushes the balls 7 to roll along the circumferential direction. The component that controls the locking member to rise and disengage from the front end of the power tool includes a control base 6 corresponding to the lower part of the ball. The bottom of the ball 7 is placed on the control base, and its inner side is located in the ball pushing groove 51.

[0026] The control chassis 6 has a cam surface 60 arranged circumferentially for the ball bearing 7. The cam surface has a recess 601 and a protrusion 602. As the sleeve 5 rotates, the ball bearing 7 can be pushed and climb onto the protrusion 602 via the transition surface 603 between the recess 601 and the protrusion 602, thus lifting the locking member and disengaging it from the power tool front end. During reset, it rotates together with the synchronous rotation assembly and falls into the recess 601. The locking member and the control chassis 6 are circumferentially connected and rotate together, for example, by using a keyway connection.

[0027] The control chassis 6 is circular and fits around the main body 1, and the ring body 41 of the locking member is located on the periphery of the sleeve body 5 of the synchronous rotation assembly.

[0028] The synchronous rotation assembly and the control chassis 6 are positioned axially. The synchronous rotation assembly can be axially positioned using the control chassis 6, which has an inner ring surface 61. The inner ring surface 61 axially limits the sleeve 5 of the synchronous rotation assembly at the rear end of the synchronous rotation assembly. The drill chuck is provided with a limiting member 8, such as a retaining ring, connected to the main body 1 at the rear of the control chassis 6.

[0029] The locking ring 4 is provided with a ring body that receives pressure from the reset assembly. The ring body has an inner surface 421 that mates with the ball bearings, thereby being axially pressed against the positioning base 6 by the ball bearings 7. The inner surface 421, the cam surface 60, and the ball bearing push groove 51 can hold the ball bearings 7.

[0030] The ring body 42 can be configured as an inner ring body relative to the ring body 41. The reset component cooperates with the inner ring body, and the reset component presses the ring body 42 downward based on the main body 1 or the coil 2.

[0031] The locking ring 41 is connected to the inner ring (ring 42) in an adjustable position, allowing the ring 41 to switch between a first connection position and a second connection position on the surface of the inner ring. The first connection position 43 is located above the second connection position 44 and is used to raise the ring 41 to a height that is disconnected from the non-rotating part of the power tool and fix it when the drill chuck is installed on the power tool, as well as to fix the relative position of the ring and the inner ring when in working condition.

[0032] The ring body 41 and the inner ring body 42 are also positioned in the circumferential direction by keyway cooperation; the ring body 42 is provided with a rearwardly extending key 47, and the key 47, the inner ring body 42 and the control chassis 6 are all connected by keyway cooperation.

[0033] The reset component may be a butterfly spring 4.

[0034] like Figures 1-6As shown, the inner side of the lock body 41 is provided with two annular grooves as a first connecting position 43 and a second connecting position 44. The outer side of the inner ring body 42 of the lock body is provided with a structure that engages with the annular grooves, such as a retaining ring 45. Or, as... Figure 7 As shown, the inner side of the locking ring 41 is provided with two annular grooves as the first and second connecting positions, and the spring-supported steel ball 46 engages with the annular grooves. Alternatively, as... Figure 8 , 9 As shown, the drill chuck is also provided with a connecting ring 9, which is fitted on the drill body and located above the inner ring body 42 and is pressed by the reset component. The inner ring body is provided with a structure 91 that engages with a shaped groove, such as an elastic claw (the inner side of the locking ring body 41 is provided with two annular grooves as the first connecting position 43 and the second connecting position 44).

[0035] The locking mechanism consists of a ring body 41 and an inner ring body 42. In addition to ensuring automatic clamping and resetting, it also has the following functions: When installing a drill chuck onto a power tool, to prevent interference from the locking end, the locking ring 41 can be manually lifted to fix it in the first positioning groove 43, thereby retracting the locking head 40. After installation, the ring body 41 can be manually pulled down to engage the locking head 40 with the power tool.

[0036] The above description is only a specific embodiment of the present utility model, but the structural features of the present utility model are not limited thereto. Any changes or modifications made by those skilled in the art within the scope of the present utility model are covered by the protection scope of the present utility model.

[0037] It should be noted that the terms "comprising" and "having," and any variations thereof, in the specification, claims, and accompanying drawings of this utility model are intended to cover non-exclusive inclusion. The terms "installed," "set," "equipped with," "connected," "linked," and "sleeve" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, elements, or components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0038] In the description of this utility model, it should be understood that the terms "one end," "the other end," "outer side," "inner side," "horizontal," "end," "length," "outer end," "left," and "right," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. The terms "first" and "second" are also used only for the sake of brevity in description and do not indicate or imply relative importance.

Claims

1. An automatically clamping drill chuck, comprising a wire coil (2), multiple jaws (3), and a body (1), wherein the body is provided with jaw grooves (11) corresponding to the jaws, the multiple jaws are slidably mounted on their respective jaw grooves, and the multiple jaws are connected to the wire coil and can radially contract to clamp the drill bit and radially expand to release the drill bit under the action of the wire coil; characterized in that, The drill chuck is also equipped with a clutch connection mechanism, which has a locking element that can connect to the non-rotating part of the front end of the power tool. With the drill bit head facing upward as the reference position, the locking element is vertically and vertically mounted at the rear of the main body. The clutch connection mechanism is also equipped with a synchronous rotation component connected to the coil screw. Between the synchronous rotation component and the locking element, there is a component that controls the locking element to rise and disengage from the front end of the power tool. The clutch connection mechanism is also equipped with a reset component.

2. The automatically clamping drill chuck as described in claim 1, characterized in that, The drill chuck has a switchable first connection position (43) and a second connection position (44) for the locking member. The first connection position is located above the second connection position and is used to raise the locking member to a height that is disconnected from the non-rotating part of the power tool and fix it when the drill chuck is installed on the power tool, and to position it at the working height when in working condition.

3. The automatically clamping drill chuck as described in claim 1, characterized in that, The locking device includes a ring (41) and a lock head (40) disposed at the rear end of the ring, the ring being fitted over the main body.

4. The automatically clamping drill chuck as described in claim 3, characterized in that, The synchronous rotation component is provided with a sleeve (5), which is fitted over the drill body. Its front end is connected to the coil wire and can rotate together. Its surface is provided with multiple ball pushing grooves (51) along the circumferential direction. The component that controls the locking member to rise and disengage from the front end of the power tool includes a control base (6) corresponding to the lower part of the ball. The bottom of the ball (7) is placed on the control base, and its inner side is located in the ball pushing groove. The control chassis has a cam surface (60) arranged circumferentially for the ball. The cam surface has a concave portion (601) and a convex portion (602). The ball can be pushed and climbed onto the convex portion through the transition surface (603) between the concave and convex portions, pushing the locking member upward and disengaging from the connection with the front end of the power tool. During reset, the ball rotates together with the synchronous rotation assembly and falls into the concave portion. The locking element and the control chassis are connected in the circumferential direction and rotate together.

5. The automatically clamping drill chuck as described in claim 4, characterized in that, The control chassis is circular and fits around the main body, and the brake ring and the locking ring are located around the outer edge of the sleeve of the synchronous rotation assembly.

6. The automatically clamping drill chuck as described in claim 4, characterized in that, The synchronous rotation assembly and control chassis are positioned axially.

7. The automatically clamping drill chuck as described in claim 6, characterized in that, The locking ring is provided with an inner ring body (42) that receives the pressure of the reset component. The inner ring body is provided with an inner surface (421) that cooperates with the ball bearing. The control chassis is provided with an inner ring surface (61). The inner ring surface axially limits the sleeve of the synchronous rotation component at the rear end of the synchronous rotation component. The drill chuck is provided with a limiting member (8) connected to the main body at the rear of the control chassis.

8. The automatically clamping drill chuck as described in claim 4, characterized in that, The locking component is provided with an inner ring body (42), the inner ring body is provided with an inner surface (421) that cooperates with the ball bearing, the reset component cooperates with the inner ring body, and the reset component presses the inner ring body downward based on the main body or the coil.

9. The automatically clamping drill chuck as described in claim 8, characterized in that, The locking ring body is connected to the inner ring body in an adjustable position, allowing the ring body to switch between the first connection position (43) and the second connection position (44) on the surface of the inner ring body. This is used to raise the ring body to a height that is disconnected from the non-rotating part of the power tool when the drill chuck is installed on the power tool and to fix it, as well as to fix the relative position of the ring body and the inner ring body in the working state.

10. The automatically clamping drill chuck as described in claim 9, characterized in that, The ring body and the inner ring body are also positioned in the circumferential direction by keyway cooperation; the ring body is provided with a rearward-extending key (47), and the key, the inner ring body and the control chassis are all connected by keyway cooperation; one of the inner side of the locking member or the outer side of the inner ring body is provided with two annular slots as the first connection position and the second connection position, and the other of the inner side of the locking member or the outer side of the inner ring body is provided with a structure that engages with the annular slot; or, the inner side of the locking member is provided with two annular slots as the first connection position and the second connection position, and the drill chuck is also provided with a positioning ring (9), the positioning ring is sleeved on the main body and is located above the inner ring body and is pressed by the reset component, and the inner ring body is provided with a structure that engages with the annular slot.

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