A two-way locking drill chuck

Abstract

This invention provides a bidirectional locking drill chuck, including a first locking part to prevent reverse loosening and a second locking part to prevent forward over-displacement. The rotating sleeve has a first control cam controlling the insertion of the first locking part into the outer gear ring and allowing the first locking part to spring back and disengage from the outer gear ring, and a second control cam controlling the insertion of the second locking part into the outer gear ring and allowing the second locking part to spring back and disengage from the outer gear ring. The rotating sleeve also has a switching structure that, when the rotating sleeve rotates to the angle where both the first and second locking parts are inserted into the outer gear ring and then continues to rotate to tighten the nut, pushes the second locking part out of the outer gear ring. A circumferential spring-back structure is also provided, so that after tightening the nut, the rotating sleeve rotates a certain angle relative to the nut, causing the switching structure to retract. This invention achieves a bidirectional locking function for the outer gear structure, preventing the drill bit from loosening due to reverse rotation during operation, and also preventing the drill bit from being unable to loosen after work is completed due to forward rotation.

Description

Technical Field

[0001] This utility model relates to a self-locking drill chuck with a two-way locking function. Background Technology

[0002] In existing technology, drill chucks include a drill body, jaws, a nut, bearings, washers, and a rotating sleeve. The rotating sleeve drives the nut to rotate via a connecting structure, thereby driving the jaws to move forward or backward, thus clamping or releasing the drill bit. The self-locking structure in a drill chuck is designed to prevent the drill bit from loosening due to reaction forces during operation. It typically consists of a spring and external teeth located on the drill body or other fixed structures. However, with the continuous increase in the power of hand drills, the vibration experienced by the drill chuck during operation may not only cause the drill bit to loosen but may also cause it to become increasingly clamped, resulting in a situation where the drill bit cannot be disassembled after work is completed. Utility Model Content

[0003] The purpose of this utility model is to provide a two-way locking drill chuck. Based on an external tooth structure, it achieves a two-way locking function, preventing the drill bit from loosening due to reverse rotation during operation, and also preventing the drill bit from being unable to loosen after work is completed due to continued forward rotation while clamped. To this end, this utility model adopts the following technical solution:

[0004] A bidirectional locking drill chuck includes a rotating sleeve, a drill body, a nut, jaws, and a self-locking structure. The rotating sleeve is connected to the nut via a connecting structure and can drive the nut to rotate. The self-locking structure includes an external gear ring, which is disposed on the drill body or a component fixedly connected to the drill body. The self-locking structure further includes an elastic lock, which is installed on the nut or a structure fixedly connected to the nut. The external gear ring is located radially inside the elastic lock. The elastic lock includes a first locking part to prevent reverse loosening and a second locking part to prevent forward over-displacement. The external gear ring has teeth that mate with the first locking part and teeth that mate with the second locking part. The rotating sleeve has a first control cam inside that controls the insertion of the first locking part into the external gear ring and allows the first locking part to spring back and disengage from the external gear ring, and a second control cam inside that controls the insertion of the second locking part into the external gear ring and allows the second locking part to spring back and disengage from the external gear ring.

[0005] The rotating sleeve is also provided with a switching structure, which allows the second locking part to be pushed out of the outer gear ring when the rotating sleeve is rotated to the angle where both the first locking part and the second locking part are inserted into the outer gear ring and the nut is tightened by continuing to rotate.

[0006] The self-locking structure is also provided with a circumferential spring-back structure, so that after the rotating sleeve is tightened on the nut, it rotates a certain angle relative to the nut, causing the switching structure to retract as well, and the second locking part is re-inserted into the outer gear ring under the control of the second control cam.

[0007] Based on the above technical solutions, the present invention may also adopt the following further technical solutions, or combine these further technical solutions:

[0008] The elastic lock uses a spring piece, and the rotating sleeve has a groove at the switching structure so that the spring piece passes through the groove. In the direction of tightening the nut, as the rotating sleeve rotates relative to the nut, the switching structure can be brought closer to the second lock part.

[0009] The central angle of the part of the first control cam that controls the insertion of the first locking part into the outer gear ring is greater than the central angle of the part of the second control cam that controls the insertion of the second locking part into the outer gear ring. This is such that when the drill bit is installed, the second locking part is not yet inserted into the outer gear ring when the first locking part is inserted into the outer gear ring. After the rotating sleeve rotates a certain angle, the part of the second control cam that controls the insertion of the second locking part into the outer gear ring controls the insertion of the second locking part into the outer gear ring. At this time, the part of the first control cam that controls the insertion of the first locking part into the outer gear ring still controls the insertion of the first locking part into the outer gear ring.

[0010] The self-locking mechanism is provided with an elastic protrusion that interacts with the rotating sleeve. The rotating sleeve is provided with a first connecting groove that engages with the elastic protrusion in the unlocked state and a second groove that engages with the elastic protrusion in the tightened and locked states. When the nut is tightened, the groove wall of the second groove is compressed in the circumferential direction relative to the elastic protrusion, which allows the rotating sleeve to be driven to rotate a certain angle relative to the nut after the nut is tightened. This causes the switching structure to retract, and the second locking part is re-inserted into the outer gear ring under the control of the second control cam.

[0011] The elastic lock uses a spring sheet, with a first locking part and a second locking part located at both ends of the spring sheet, and an elastic protrusion located in the middle of the spring sheet. The middle of the spring sheet is provided with a groove formed by bending, and the groove is used for installation. The elastic protrusion is located at the bottom of the groove.

[0012] The nut is connected to the nut sleeve, and the spring is installed on the nut sleeve. The nut sleeve has holes, and a key is formed between the holes. The spring is installed by being snapped onto the key through a groove. The holes include holes corresponding to the elastic protrusions and holes through which the locking part on the spring passes to enter the interior of the nut sleeve and engage with the outer gear ring.

[0013] The nut is connected to the nut sleeve, and the spring is formed on the nut sleeve.

[0014] The nut is connected to a nut sleeve, and the nut sleeve is formed with a first spring piece having a first locking part, a second spring piece having a second locking part, and a third spring piece having the elastic protrusion. The first spring piece and the second spring piece are respectively located on both sides of the fixed part, and the third spring piece is at a different height from the first spring piece and the second spring piece in the axial direction.

[0015] The nut is connected to the nut sleeve, and the elastic lock is disposed on the ring-shaped component. The ring-shaped component is fixedly installed on the nut sleeve and includes a first spring piece with a first locking part, a second spring piece with a second locking part, and a third spring piece with the elastic protrusion. The first spring piece and the second spring piece are respectively located on both sides of the fixed part, and the third spring piece is at a different height in the axial direction from the first spring piece and the second spring piece.

[0016] The elastic lock is disposed on the ring-shaped component, which is fixedly mounted on the nut and includes a first spring plate with a first locking part, a second spring plate with a second locking part, and a third spring plate with the elastic protrusion. The first spring plate and the second spring plate are respectively located on both sides of the fixed part, and the third spring plate is at a different height in the axial direction from the first spring plate and the second spring plate.

[0017] The outer gear ring is circumferentially arranged with tooth units, which are arranged in the order of first tooth, dual-purpose tooth, second tooth and transition tooth. The first tooth and the second tooth are ratchet teeth that lock into the first locking part and the second locking part, respectively. The two sides of the dual-purpose tooth can lock into the first locking part and the second locking part, respectively. The two sides of the transition tooth are used to make way. The first locking part and the second locking part are inserted into the outer gear ring and engage with the first tooth and the second tooth, respectively.

[0018] The outer gear ring is circumferentially spaced between dual-purpose teeth and transition teeth. The two sides of the dual-purpose teeth can respectively lock and engage with the first locking part and the second locking part. The two sides of the transition teeth are used to make way so that the first locking part and the second locking part can be inserted into the outer gear ring and engage with different tooth surfaces of the dual-purpose teeth respectively.

[0019] By adopting the technical solution of this utility model, the external tooth structure achieves a two-way locking function. During operation, it can not only prevent the drill bit from coming loose due to reverse rotation, but also prevent the drill bit from being unable to come loose after the work is completed due to forward rotation. Attached Figure Description

[0020] Figure 1 This is an exploded view of Embodiment 1 of this utility model.

[0021] Figure 2 This is a cross-sectional view of Embodiment 1 of the present utility model.

[0022] Figure 3 , 45 and 6 represent, respectively, the unlocked state, the reverse-locked state, the forward and reverse-locked state, and the state when the nut is tightened in Embodiment 1 of this utility model. Figure 2 The AA cross-sectional view shows the direction of tightening the nut, which is also the direction of rotation of the nut when the driving jaws clamp the drill bit.

[0023] Figure 7 , 8 9 represent, in sequence, the unlocked state, the locked state in both forward and reverse directions, and the state when the nut is tightened according to Embodiment 1 of this utility model. Figure 2 The BB sectional view shows the relationship between the inner drive block and the nut or the fixed part on the nut (nut sleeve).

[0024] Figure 10 This is a schematic diagram of the combination of the nut sleeve, nut, locking plate and drill body in Embodiment 1 of this utility model.

[0025] Figure 11 This is a schematic diagram of an embodiment of an external tooth structure according to the present invention.

[0026] Figure 12 This is a schematic diagram of another embodiment of the external tooth structure of this utility model.

[0027] Figure 13 This is a schematic diagram of the internal structure of the inner sleeve of Embodiment 1 of this utility model.

[0028] Figure 14 This is a schematic diagram of the nut sleeve in Embodiment 2 of this utility model.

[0029] Figure 15 This is a schematic diagram of the combination of the nut sleeve, nut and drill body in Embodiment 3 of this utility model.

[0030] Figure 16 This is an exploded view of the nut sleeve and nut in Embodiment 3 of this utility model.

[0031] Figure 17 This is a cross-sectional view of Embodiment 4 of the present invention.

[0032] Figure 18 This is an exploded view of the nut sleeve and nut in Embodiment 4 of this utility model.

[0033] Figure 19 This is a schematic diagram of the combination of the nut sleeve, nut and drill body in Embodiment 4 of this utility model. Detailed Implementation

[0034] See attached document Figure 1-13This utility model provides a bidirectional locking drill chuck, comprising a rotating sleeve 2, a drill body 1, a nut 3, a jaw 4, and a self-locking structure. The rotating sleeve 2 is connected to the nut via a connecting structure and can drive the nut to rotate. Reference numeral 20 in the attached drawing represents the outer shell of the rotating sleeve.

[0035] The self-locking structure includes an external gear ring 11, which can be a separate element disposed on the drill body 1 or on a component fixedly connected to the drill body 1. The external gear ring is disposed on the outer surface of these components, with the tooth tips and tooth surfaces facing radially outward from the drill body. In this embodiment, the external gear ring 11 is fixed to the outer surface of the drill body 1. The self-locking structure also includes an elastic lock, with the external gear ring 11 located radially inward from the elastic lock. The elastic lock can be a spring 5.

[0036] The elastic lock is installed on the nut 3 or a structure fixedly connected to the nut. In this embodiment, it is installed on the nut sleeve 30. The nut is a two-part structure, which is connected to the nut sleeve 30 to form a whole nut. Holes can be opened on the nut sleeve, and a key 31 is formed between the holes. The spring piece 5 can be bent into a groove shape and is installed by using the groove shape to lock onto the key. The elastic lock includes a first locking part 51 to prevent reverse loosening (i.e., to prevent the drill bit from loosening due to reverse rotation) and a second locking part 52 to prevent forward over-extension (to prevent the drill bit from being unable to be loosened after the work is completed due to continued forward rotation in the clamped state). The first locking part 51 and the second locking part 52 are located at both ends of the spring piece 3. The outer gear ring has teeth that engage with the first locking part and teeth that engage with the second locking part. The rotating sleeve 2 is provided with a first control cam 21 that controls the first locking part 51 to insert into the outer gear ring 11 and allows the first locking part 51 to spring back and disengage from the outer gear ring 11, and a second control cam 22 that controls the second locking part to insert into the outer gear ring and allows the second locking part 52 to spring back and disengage from the outer gear ring 11.

[0037] The rotating sleeve 2 is also provided with a switching structure 6, which allows the second locking part 52 to be pushed out of the outer gear ring 11 when the rotating sleeve 2 is rotated to the angle where both the first locking part 51 and the second locking part 52 are inserted into the outer gear ring and the nut is tightened.

[0038] The self-locking structure is also provided with an axial springback structure, so that after the rotating sleeve 2 is tightened, it is driven to rotate a certain angle relative to the nut, causing the switching structure to retract as well. This certain angle ensures that after rotation, the second locking part 52 is still within the control range of the second control cam 22, and then disengages from the switching structure, and is reinserted into the outer gear ring 11 under the control of the second control cam 22.

[0039] The rotating sleeve 2 has a channel 23 inside the switching structure 6, through which the spring piece 5 passes. The switching structure is located on one side of the channel wall. In the direction of tightening the nut 3, the rotation of the rotating sleeve relative to the nut allows the switching structure to move closer to the second locking part 52.

[0040] The central angle of the portion 211 in the first control cam 21 that controls the insertion of the first locking part 51 into the outer gear ring 11 is greater than the central angle of the portion 221 in the second control cam 22 that controls the insertion of the second locking part 52 into the outer gear ring 11. This is such that when the drill bit is installed, when the first locking part 51 is inserted into the outer gear ring 11, the second locking part 52 has not yet been inserted into the outer gear ring 11. After the rotating sleeve 2 rotates a certain angle, the portion 221 in the second control cam 22 that controls the insertion of the second locking part 52 into the outer gear ring 11 controls the second locking part 52 to be inserted into the outer gear ring 11. At this time, the portion 211 in the first control cam 21 that controls the insertion of the first locking part 51 into the outer gear ring 11 still controls the first locking part 51 to be inserted into the outer gear ring 11.

[0041] The self-locking mechanism is provided with an elastic protrusion 53 that interacts with the rotating sleeve 2. The rotating sleeve 2 is provided with a first connecting groove 24 that engages with the elastic protrusion 53 in the unlocked state and a second groove 25 that engages with the elastic protrusion 53 in the tightened state and the locked state. When the nut 3 is tightened, the groove wall 251 of the second groove 25 compresses the elastic protrusion 53 in the circumferential direction, so that after the nut 3 is tightened, the rotating sleeve 2 is driven to rotate a certain angle relative to the nut 3, causing the switching structure 6 to retract as well. Under the control of the second control cam 22, the second locking part 52 is re-inserted into the outer gear ring 11.

[0042] The elastic protrusion is located in the middle of the spring piece and at the bottom of the groove. The holes on the nut sleeve include holes 32 corresponding to the elastic protrusion 53 (which can help the elastic protrusion deform and increase the stability of the installation) and holes 33 for the locking part on the spring piece 5 to pass through and enter the interior of the nut sleeve 30 to cooperate with the external gear ring 11.

[0043] For the interval from the unlocked state to the reverse locked state, the rotating sleeve drives the nut 3 to rotate through the connection between the elastic protrusion 53 and the first connecting groove 24. After that, if the nut 3 is tightened, it is driven by the cooperation of the drive block 26 inside the rotating sleeve 2 and the first drive key 34 on the nut 2 or on the structure fixed to the nut (such as the nut sleeve). When the rotating sleeve 2 rotates through a certain angle until the elastic protrusion falls into the second connecting groove 25, there is still a gap 36 between the drive block 26 and the drive key 34, which allows the rotating sleeve 2 to continue to rotate relative to the nut 3 so that the groove wall 251 can compress the elastic protrusion 53. When the drive block 26 and the first drive key 34 come into contact, their cooperation drives the nut 3 to tighten. When the nut 3 is tightened, the release of the compressive potential energy of the elastic protrusion 53 drives the rotating sleeve 2 to rotate back a certain angle. When moving from the locked state to the unlocked state, the drive rotating sleeve 2 rotates in the opposite direction until the other side of the drive block 26 contacts the second drive key 35 on the nut 2 or on a structure fixed to the nut (such as a nut sleeve) (at this time, the elastic protrusion 53 falls into the first connecting groove 24). If the rotation continues in the opposite direction, the nut 3 will be loosened.

[0044] For the teeth that mate with the first locking part and the teeth that mate with the second locking part, the external gear ring 11 can be configured as follows: See Figures 3-11 The toothed units are arranged circumferentially, and the toothed units are arranged in the order of first tooth 111, dual-purpose tooth 113, second tooth 112 and transition tooth 114. The first tooth 111 and the second tooth 112 are ratchet teeth that lock the first locking part 51 and the second locking part 52 respectively. The two sides of the dual-purpose tooth 113 can lock the first locking part 111 and the second locking part 112 respectively. The two sides of the transition tooth 114 are used to make way so that the first locking part 111 and the second locking part 112 can be inserted into the outer toothed ring 11 and engage with the first tooth 111 and the second tooth 112 respectively.

[0045] For the teeth that mate with the first locking part and the teeth that mate with the second locking part, the external gear ring 11 can also be constructed in this manner: see [link to relevant documentation]. Figure 12 The outer gear ring 11 is provided with dual-purpose teeth 113 and transition teeth 114 at intervals along the circumference. The two sides of the dual-purpose teeth 113 can lock and engage with the first locking part 51 and the second locking part 52 respectively. The two sides of the transition teeth 114 are used to make way so that the first locking part 51 and the second locking part 52 can be inserted into the outer gear ring and engage with different tooth surfaces of the dual-purpose teeth respectively.

[0046] Reference Figure 14In this utility model, when a nut sleeve is used, the spring piece can also be directly formed by a cantilever structure molded on the nut sleeve 30b. The nut 3 is externally connected to the nut sleeve 30b, and the nut sleeve 30b is formed with a first spring piece 511 having a first locking part 51, a second spring piece 521 having a second locking part 52, and a third spring piece 531 having the elastic protrusion 53. The first spring piece 511 and the second spring piece 521 are respectively located on both sides of the fixed part, and the third spring piece 531 is also connected to the fixed part, and is at a different height in the axial direction from the first spring piece 511 and the second spring piece 521. In this embodiment, the first drive key and the second drive key of the aforementioned embodiment can be set on the nut.

[0047] Reference Figure 15 , 16 In this embodiment, the nut is connected to a nut sleeve 30c, and the elastic lock is disposed on a ring-shaped component 5c. The ring-shaped component 5c is fixedly installed on the nut sleeve 30c (for example, by using a keyway to engage with the nut sleeve). The ring-shaped component 5c includes a first spring piece 511 with a first locking part 51, a second spring piece 521 with a second locking part 52, and a third spring piece 531 with the elastic protrusion 53. The first spring piece 511 and the second spring piece 521 are respectively located on both sides of the fixed part, and the third spring piece 531 is at a different height in the axial direction from the first spring piece 511 and the second spring piece 521. In this embodiment, the first drive key and the second drive key of the aforementioned embodiment can be disposed on the nut.

[0048] Reference Figure 17 , 18 19. In this embodiment, the elastic lock is disposed on the ring-shaped component 5d, which is fixedly mounted on the nut 3d (e.g., by using a keyway to engage with the nut 3d). The ring-shaped component 5d includes a first spring piece 511 with a first locking part 51, a second spring piece 521 with a second locking part 52, and a third spring piece 531 with the elastic protrusion 53. The first spring piece 511 and the second spring piece 521 are respectively located on both sides of the fixed part, and the third spring piece 531 is also connected to the fixed part, and is at a different height in the axial direction from the first spring piece 511 and the second spring piece 521. The first drive key and the second drive key in the aforementioned embodiment can be disposed on the nut.

[0049] In this embodiment, the external toothed ring 11 also serves as a washer located behind the nut 3d, and the ring-shaped component is also located behind the nut.

[0050] 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.

[0051] 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.

[0052] 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. A bidirectional locking drill chuck, comprising a rotating sleeve, a drill body, a nut, jaws, and a self-locking structure, wherein the rotating sleeve is connected to the nut via a connecting structure and can drive the nut to rotate, and the self-locking structure includes an external gear ring, the external gear ring being disposed on the drill body or on a component fixedly connected to the drill body, characterized in that, The self-locking structure also includes an elastic lock, which is installed on a nut or a structure fixedly connected to the nut, and the outer gear ring is located radially inside the elastic lock; the elastic lock includes a first locking part to prevent reverse loosening and a second locking part to prevent forward over-displacement, and the outer gear ring is distributed with teeth that cooperate with the first locking part and teeth that cooperate with the second locking part; the rotating sleeve is provided with a first control cam that controls the insertion of the first locking part into the outer gear ring and allows the first locking part to spring back and disengage from the outer gear ring, and a second control cam that controls the insertion of the second locking part into the outer gear ring and allows the second locking part to spring back and disengage from the outer gear ring; The rotating sleeve is also provided with a switching structure, which allows the second locking part to be pushed out of the outer gear ring when the rotating sleeve is rotated to the angle where both the first locking part and the second locking part are inserted into the outer gear ring and the nut is tightened by continuing to rotate. The self-locking structure is also provided with a circumferential spring-back structure, so that after the rotating sleeve is tightened on the nut, it rotates a certain angle relative to the nut, causing the switching structure to retract as well, and the second locking part is re-inserted into the outer gear ring under the control of the second control cam.

2. The bidirectional locking drill chuck as described in claim 1, characterized in that, The elastic lock uses a spring piece, and the rotating sleeve has a groove at the switching structure so that the spring piece passes through the groove. In the direction of tightening the nut, as the rotating sleeve rotates relative to the nut, the switching structure can be brought closer to the second lock part.

3. The bidirectional locking drill chuck as described in claim 1, characterized in that, The central angle of the part of the first control cam that controls the insertion of the first locking part into the outer gear ring is greater than the central angle of the part of the second control cam that controls the insertion of the second locking part into the outer gear ring. This is such that when the drill bit is installed, the second locking part is not yet inserted into the outer gear ring when the first locking part is inserted into the outer gear ring. After the rotating sleeve rotates a certain angle, the part of the second control cam that controls the insertion of the second locking part into the outer gear ring controls the insertion of the second locking part into the outer gear ring. At this time, the part of the first control cam that controls the insertion of the first locking part into the outer gear ring still controls the insertion of the first locking part into the outer gear ring.

4. A bidirectional locking drill chuck as described in claim 1, characterized in that, The self-locking structure is provided with an elastic protrusion that interacts with the rotating sleeve. The rotating sleeve is provided with a first connecting groove that engages with the elastic protrusion in the unlocked state and a second groove that engages with the elastic protrusion in the tightened and locked states. When the nut is tightened, the groove wall of the second groove has a compression amount in the circumferential direction relative to the elastic protrusion, which allows the rotating sleeve to be driven to rotate a certain angle relative to the nut after the nut is tightened, causing the switching structure to retract as well. Under the control of the second control cam, the second locking part is re-inserted into the outer gear ring.

5. A bidirectional locking drill chuck as described in claim 4, characterized in that, The elastic lock uses a spring sheet, with a first locking part and a second locking part located at both ends of the spring sheet, and an elastic protrusion located in the middle of the spring sheet. The middle of the spring sheet is provided with a groove formed by bending, and the groove is used for installation. The elastic protrusion is located at the bottom of the groove.

6. A bidirectional locking drill chuck as described in claim 5, characterized in that, The nut is connected to the nut sleeve, and the spring is installed on the nut sleeve. The nut sleeve has holes, and a key is formed between the holes. The spring is installed by being snapped onto the key through a groove. The holes include holes corresponding to the elastic protrusions and holes through which the locking part on the spring passes to enter the interior of the nut sleeve and engage with the outer gear ring.

7. A bidirectional locking drill chuck as described in claim 2, characterized in that, The nut is connected to the nut sleeve, and the spring is formed on the nut sleeve.

8. A bidirectional locking drill chuck as described in claim 4, characterized in that, The nut is connected to a nut sleeve, and the nut sleeve is formed with a first spring piece having a first locking part, a second spring piece having a second locking part, and a third spring piece having the elastic protrusion. The first spring piece and the second spring piece are respectively located on both sides of the fixed part, and the third spring piece is at a different height from the first spring piece and the second spring piece in the axial direction.

9. A bidirectional locking drill chuck as described in claim 4, characterized in that, The nut is connected to the nut sleeve, and the elastic lock is disposed on the ring-shaped component. The ring-shaped component is fixedly installed on the nut sleeve and includes a first spring piece with a first locking part, a second spring piece with a second locking part, and a third spring piece with the elastic protrusion. The first spring piece and the second spring piece are respectively located on both sides of the fixed part, and the third spring piece is at a different height in the axial direction from the first spring piece and the second spring piece.

10. A bidirectional locking drill chuck as described in claim 4, characterized in that, The elastic lock is disposed on the ring-shaped component, which is fixedly mounted on the nut and includes a first spring plate with a first locking part, a second spring plate with a second locking part, and a third spring plate with the elastic protrusion. The first spring plate and the second spring plate are respectively located on both sides of the fixed part, and the third spring plate is at a different height in the axial direction from the first spring plate and the second spring plate.

11. A bidirectional locking drill chuck as described in claim 1, characterized in that, The outer gear ring is circumferentially arranged with tooth units, which are arranged in the order of first tooth, dual-purpose tooth, second tooth and transition tooth. The first tooth and the second tooth are ratchet teeth that lock into the first locking part and the second locking part, respectively. The two sides of the dual-purpose tooth can lock into the first locking part and the second locking part, respectively. The two sides of the transition tooth are used to make way. The first locking part and the second locking part are inserted into the outer gear ring and engage with the first tooth and the second tooth, respectively.

12. A bidirectional locking drill chuck as described in claim 1, characterized in that, The outer gear ring is circumferentially spaced between dual-purpose teeth and transition teeth. The two sides of the dual-purpose teeth can respectively lock and engage with the first locking part and the second locking part. The two sides of the transition teeth are used to make way so that the first locking part and the second locking part can be inserted into the outer gear ring and engage with different tooth surfaces of the dual-purpose teeth respectively.

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