A general-purpose drill chuck

Abstract

This application provides a universal drill chuck for both coarse and fine diameters, including a connecting body, multiple jaws slidably connected to the connecting body, and a tapered nut threadedly connected to the multiple jaws. A jaw core is slidably connected inside each jaw, extending and sliding in the same direction as the jaws. The front end of the jaw core can extend beyond the front end of the jaws. The jaw core has threaded teeth, which can coincide with the threaded teeth of the jaws. A toothless area is provided on the surface of the jaws where the threaded teeth are located, exposing the threaded teeth of the jaw core. The tapered nut includes a coarse nut and a fine nut, with the fine nut located in front of the coarse nut. When the multiple jaws are not clamped and the jaw core is not extended, the threaded teeth at the rear end of the jaw core are located in the toothless area of ​​the jaws and threadedly connected to the fine nut. The coarse nut is threadedly connected to the threaded teeth on the jaws located behind the toothless area. The connecting body is fitted with a front cover, a middle cover, and a rear cover. The front cover and the middle cover are respectively connected to the fine nut and the coarse nut and rotate synchronously.

Description

Technical Field

[0001] This utility model relates to the field of power tool technology, specifically to a universal drill chuck for both coarse and fine applications. Background Technology

[0002] A hand drill is the most common and readily available small drilling tool for home use. The chuck is the structure of the electric drill used to hold the drill bit, including the connecting body, three jaws, a conical nut, and a back cover and a front cover. When in use, rotating the front cover rotates the conical nut, which in turn causes the three jaws to converge at the center of the clamping to hold the drill bit, or to spread outwards to release the drill bit.

[0003] Existing chucks typically have a clamping plane on the side of the three jaws facing the clamping center. This causes a hole to form in the middle when the three jaws are close together, making it impossible to clamp very fine drill bits, such as those with a diameter of 2mm or less. Workers usually try to increase the diameter by wrapping electrical tape around the outside of the drill bit, or by cutting a piece of plastic tubing or wire sheath and covering it. However, these methods have several problems: 1) When electrical tape, plastic tubing, or wire is not available, very fine drill bits cannot be used; 2) Electrical tape, plastic tubing, and wire are all soft materials, which cannot ensure the axial accuracy of the drill bit after clamping, thus compromising drilling accuracy.

[0004] Alternatively, the above problems can be solved by replacing the chuck with one specifically designed to hold finer drill bits. However, the three jaws of this type of chuck will be sharper on the side facing the clamping center. Sharper parts have lower structural strength and are more fragile, making them unsuitable for large-diameter drill bits that require high torque. This can easily lead to jaw damage or drill bit slippage. Consequently, when drilling holes of different diameters, the chuck must be replaced, which is not only inconvenient to install and remove, but also requires at least two types of chucks, increasing costs and making them inconvenient to carry. Utility Model Content

[0005] To address the technical problems existing in the background art, this utility model provides a universal electric drill chuck for both coarse and fine drill bits.

[0006] The technical solution of this utility model is as follows:

[0007] A universal drill chuck for both coarse and fine diameters includes a connecting body, multiple jaws slidably connected to the connecting body, and a tapered nut threadedly connected to the multiple jaws. The front end of the connecting body is for inserting a drill bit. A claw core is slidably connected inside the jaws. The claw core extends and slides in the same direction as the jaws. The front end of the claw core can extend beyond the front end of the jaws. The width of the claw core in the circumferential direction of the connecting body is smaller than the width of the clamping surface of the jaws. The claw core is provided with threaded teeth, and the threaded teeth of the claw core can coincide with the threaded teeth of the jaws. The surface of the jaws where the threaded teeth are provided has a toothless area that can expose the threaded teeth of the claw core.

[0008] The tapered nut includes a coarse clamp nut and a fine clamp nut. The fine clamp nut is located in front of the coarse clamp nut. When multiple jaws are clamped without blades and the jaw core is not extended, the threaded teeth at the rear end of the jaw core are located in the toothless area of ​​the jaws and are threadedly connected to the fine clamp nut. The coarse clamp nut is threadedly connected to the threaded teeth on the jaws located behind the toothless area.

[0009] The connecting body is fitted with a front cover, a middle cover, and a rear cover arranged in a front-to-back manner. The front cover and the middle cover are rotatably connected to the connecting body, and they are respectively connected to the fine clamp nut and the coarse clamp nut, and rotate synchronously.

[0010] When in use, if it is necessary to clamp a large-diameter drill bit, the front cover can be used to rotate the fine chuck nut, causing the jaw core to retract. Then, the front and middle covers can be used to rotate the fine and large chuck nuts synchronously, causing the jaws to extend and retract, thus clamping the drill bit and providing high torque. If it is necessary to clamp an extra-fine-diameter drill bit, first rotate the front and middle covers synchronously to clamp the jaws without the drill bit. Then, rotate the front cover alone to extend the jaw core, further filling the space between the jaws to clamp the extra-fine-diameter drill bit.

[0011] The electric drill chuck of this application can not only hold coarse drill bits to provide high torque by directly and selectively rotating the front cover and the middle cover, but also hold extra-fine drill bits, without the need for additional items or chuck replacement, which greatly improves the ease of use of the electric drill chuck.

[0012] In the above-mentioned scheme, the claw core is plate-shaped, and the plate surface is parallel to the radial plane of the connecting body to provide a longer clamping surface and also to distribute the load brought about by clamping.

[0013] Furthermore, the claw core is located at the position of the gripper's symmetry plane.

[0014] In the above scheme, the gripper has a receiving groove for accommodating the gripper core. The receiving groove is connected to the front end of the gripper and the surface where the threaded teeth are set. The rear sidewall of the receiving groove is located at the rear side of the toothless area of ​​the gripper. The rear sidewall of the receiving groove plays a limiting role for the gripper core.

[0015] In the above design, the clamping surface of the jaws is a V-shaped concave surface that extends along the axial direction of the connecting body. The V-shaped concave clamping surface increases the contact points between the jaws and the clamped drill bit, improves friction, and thus enhances clamping stability and provides torque assurance.

[0016] Preferably, the included angle of the V-shaped clamping surface of the jaws is 160-170 degrees. This increases the contact points with the drill bit while avoiding damage to the original structural strength of the jaws, especially the structural strength of the clamping surface.

[0017] Furthermore, the front end of the claw core also has a clamping surface facing the central axis of the connecting body. This clamping surface is flat and extends along the axial direction of the connecting body. This ensures the structural strength of the clamping surface of the claw core.

[0018] To stabilize the rotation of the tapered nut, a retaining ring is provided on the connecting body, located behind the coarse clamping nut. The retaining ring has a through hole for the clamping jaws to pass through. The retaining ring and the front cover cooperate to clamp the tapered nut between them for movement and limitation.

[0019] Furthermore, a limiting ring is provided on the connecting body, located behind the retaining ring, which can block the gripper. The limiting ring is used to limit the extreme position of the gripper's backward movement, preventing the gripper from moving too far backward. At the same time, when multiple grippers are installed, it can align the grippers, avoid errors from manual alignment, and ensure the gripping accuracy of the grippers.

[0020] In the above design, a locking block is slidably connected to the rear side of the front cover, and a slot is provided on the middle cover for the locking block to slide into. By sliding the locking block into the slot, the front cover and the middle cover are locked in place, thus facilitating the synchronous rotation of the front cover and the middle cover.

[0021] This utility model provides a universal drill chuck for both coarse and fine drill bits. A claw core slides within the jaws, and two nuts, a coarse nut and a fine nut, are provided. When a coarse drill bit needs to be clamped, the coarse and fine nuts are rotated synchronously, causing the jaws and claw core to slide simultaneously, thus clamping the coarse drill bit. When a fine drill bit needs to be clamped, the claw core is extended separately by adjusting the fine nut to clamp the fine drill bit. This allows for the clamping of both coarse and fine drill bits with a single chuck, eliminating the need for additional equipment or chuck replacement, greatly improving the ease of use of drill chucks. Attached Figure Description

[0022] In the attached diagram:

[0023] Figure 1 This is a schematic diagram of a drill chuck;

[0024] Figure 2 This is an exploded view of the drill chuck.

[0025] Figure 3 This is a partial cross-sectional view of the drill chuck.

[0026] Figure 4 This is a schematic diagram of the gripper;

[0027] Figure 5 This is a comparative diagram showing the claw core before and after it extends.

[0028] The components represented by the various reference numerals in the diagram are:

[0029] 1. Connecting body; 11. Guide hole; 12. Retaining ring; 13. Limiting ring; 2. Clamping claw; 21. Toothless area; 22. Receiving groove; 3. Claw core; 4. Coarse clamping nut; 5. Fine clamping nut; 6. Front cover; 61. Locking block; 7. Middle cover; 71. Locking groove; 8. Rear cover. Detailed Implementation

[0030] like Figures 1 to 3 As shown, this utility model embodiment provides a universal electric drill chuck for both coarse and fine diameters, including a connecting body 1, a plurality of jaws 2 slidably connected to the connecting body 1, and a conical nut threadedly connected to the plurality of jaws 2. The front end of the connecting body 1 is for inserting a drill bit. A claw core 3 is slidably connected inside the jaws 2. The claw core 3 extends and slides in the same direction as the jaws 2. The front end of the claw core 3 can extend beyond the front end of the jaws 2. The width of the claw core 3 in the circumferential direction of the connecting body 1 is less than the width of the clamping surface of the jaws 2. The claw core 3 is provided with threaded teeth, and the threaded teeth of the claw core 3 can coincide with the threaded teeth of the jaws 2. The surface of the jaws 2 where the threaded teeth are provided is provided with a toothless area 21, which can expose the threaded teeth of the claw core 3.

[0031] The tapered nut includes a coarse clamp nut 4 and a fine clamp nut 5. The fine clamp nut 5 is located in front of the coarse clamp nut 4. When multiple jaws 2 are clamped without blades and the jaw core 3 is not extended, the threaded teeth at the rear end of the jaw core 3 are located in the toothless area 21 of the jaw 2 and are threadedly connected to the fine clamp nut 5. The coarse clamp nut 4 is threadedly connected to the threaded teeth on the jaw 2 located behind the toothless area 21.

[0032] The connecting body 1 is equipped with a front cover 6, a middle cover 7 and a rear cover 8 arranged in a front-to-back manner. The front cover 6 and the middle cover 7 are rotatably connected to the connecting body 1, and they are respectively connected to the fine clamp nut 5 and the coarse clamp nut 4, and rotate synchronously.

[0033] In use, if a large-diameter drill bit needs to be clamped, the front cover 6 can be used to rotate the fine clamping nut 5, causing the claw core 3 to retract. Then, the front cover 6 and the middle cover 7 can be used to rotate the fine clamping nut 5 and the large clamping nut 4 simultaneously, causing the jaws 2 to extend and retract, thus clamping the drill bit and providing high torque. If an extra-fine-diameter drill bit needs to be clamped, the front cover 6 and the middle cover 7 should be rotated simultaneously first to clamp the jaws 2 without the drill bit. Then, the front cover 6 should be rotated alone to extend the claw core 3, further encroaching on the space between the jaws 2 to clamp the extra-fine-diameter drill bit.

[0034] The electric drill chuck of this application can not only hold coarse drill bits to provide high torque by directly and selectively rotating the front cover 6 and the middle cover 7, but also hold extra-fine drill bits, without the need for additional items or chuck replacement, which greatly improves the ease of use of the electric drill chuck.

[0035] In detail, the rear end of the connecting body 1 is used to connect to the output end of the electric drill, and the front end is used for inserting and clamping the drill bit. The shape and structure of the connecting body 1 can be referred to the shape of the connecting body 1 of the existing electric drill chuck, and will not be described in detail here.

[0036] The connecting body 1 has three guide holes 11, which are arranged in a circular array around the connecting body 1 and extend obliquely from back to front and from right to outside to inside. There are three grippers 2, which slide within the guide holes 11 respectively.

[0037] The jaws 2 are cylindrical in shape. A V-shaped engagement angle, 120 degrees, is cut at the front end of the jaws 2 facing the central axis of the connecting body 1, ensuring a tight fit between the three jaws 2 when no cutting tool is clamped. A clamping surface is provided at the bend of the V-shaped engagement angle, extending axially along the connecting body 1, for contacting and pressing against the cylindrical surface of the drill bit. Threaded teeth are provided on the side of the jaws 2 away from the central axis of the connecting body 1. The structure of the jaws 2 described above is identical to that of jaws 2 in existing chucks; those skilled in the art can refer to the jaws 2 of existing chucks for their specific structure, which will not be described in detail here.

[0038] The gripper 2 in this embodiment differs from the existing gripper 2 in that, for details see [link to specific details]. Figures 3 to 5 As shown, a claw core 3 is slidably connected inside the jaw 2. The claw core 3 extends and slides in the same direction as the jaw 2. The front end of the claw core 3 can extend out of the front end of the jaw 2. The width of the claw core 3 in the circumferential direction of the connecting body 1 is less than the width of the clamping surface of the jaw 2. When the three jaws 2 have clamped but still cannot clamp the ultra-fine drill bit, the claw core 3 can be extended to squeeze the space of the hole surrounded by the three jaws 2 and clamp the ultra-fine drill bit.

[0039] The claw core 3 is plate-shaped, with its surface parallel to the radial plane of the connecting body 1. The claw core 3 is preferably located at the position of the symmetrical plane of the gripper 2.

[0040] The front end of the claw core 3 is also provided with a clamping surface facing the central axis of the connecting body 1. This clamping surface extends along the axial direction of the connecting body 1 and is used to abut and press against the cylindrical surface of the ultra-fine drill bit.

[0041] The claw core 3 is designed in a plate shape, which makes the clamping surface longer, ensuring the stability of the drill bit clamping, and also distributing the impact load of the drill bit on the claw core 3 when the chuck rotates.

[0042] The gripper 2 has a receiving groove 22 for accommodating the gripper core 3. The receiving groove 22 is connected to the front end of the gripper 2 and the surface where the threaded teeth are set, such as... Figure 4 As shown. The receiving groove 22 divides part of the threaded teeth of the gripper 2 into two, and the claw core 3, located on the side away from the central axis of the connecting body 1 and near the rear end, also has threaded teeth. The threaded teeth have the same tooth shape as the threaded teeth of the gripper 2. When the claw core 3 slides in the receiving groove 22, the threaded teeth of the claw core 3 slide between the two divided threaded teeth of the gripper 2, and the threaded teeth of the claw core 3 can coincide with the threaded teeth of the gripper 2.

[0043] In addition, the gripper 2 has a toothless area 21 on the surface where the threaded teeth are provided. The rear sidewall of the receiving groove 22 is located at the rear side of the toothless area 21 of the gripper 2, and the rear sidewall of the receiving groove 22 plays a limiting role for the gripper core 3. When the rear end of the gripper core 3 contacts the rear sidewall of the receiving groove 22, the threaded teeth at the rear end of the gripper core 3 can be exposed from the toothless area 21 of the gripper 2.

[0044] In addition, combined Figure 2 and Figure 3 As shown, another core design of this embodiment is that the conical nut is divided into a coarse clamping nut 4 and a fine clamping nut 5. The two are coaxially arranged with the connecting body 1, and the fine clamping nut 5 is located in front of the coarse clamping nut 4. The two nuts can be threadedly connected to the threaded teeth of the clamping jaws 2 at the same time, thereby driving the three clamping jaws 2 to slide.

[0045] For ease of understanding, the coarse clamp nut 4 and the fine clamp nut 5 can be considered as two parts of the existing conical nut in the clamp.

[0046] When multiple jaws 2 are not clamped without blades and the jaw core 3 is not extended, the fine clamping nut 5 corresponds to the toothless area 21 of the jaw 2, and at this time it is only threadedly connected to the threaded teeth of the jaw core 3 exposed from the toothless area 21. The coarse clamping nut 4 is threadedly connected to the threaded teeth on the jaw 2 located behind the toothless area 21. At this time, the threaded teeth on the jaw core 3 that are not connected to the fine clamping nut 5 are in a state of overlap with the threaded teeth of the jaw 2. There are two adjustment methods at this time, as follows:

[0047] First, the coarse drill bit is clamped. Simultaneous rotation of the coarse clamping nut 4 and the fine clamping nut 5 causes the jaws 2 and jaw core 3 to move backward synchronously. During this movement, the coarse clamping nut 4 gradually disengages from the threaded teeth on the jaw 2 located behind the toothless area 21, while the fine clamping nut 5 gradually engages with the threaded teeth on the jaw located in front of the toothless area 21, ensuring that the pushing force of the coarse clamping nut 4 and the fine clamping nut 5 on the jaw 2 continues. The threaded teeth of the jaw core 3 coincide with the threaded teeth of the jaw 2, and with the simultaneous rotation of the two nuts, it moves synchronously with the jaw 2. This allows the jaw 2 to open, allowing the coarse drill bit to be inserted. Similarly, the simultaneous rotation of the two nuts clamps the coarse drill bit tightly with the clamping surfaces of the jaw 2.

[0048] Another method is to clamp ultra-fine drill bits. Only the fine clamp nut 5 is rotated. Since the coarse clamp nut 4 does not move, the jaw 2 connected to it also does not move. The fine clamp nut 5 corresponds to the toothless area 21 of the jaw 2 and is only connected to the jaw core 3. Rotating the fine clamp nut 5 will only cause the jaw core 3 to extend. The extended jaw core 3 is used to clamp ultra-fine drill bits that the jaw 2 cannot clamp.

[0049] When the claw core 3 extends to clamp the fine drill bit, its stroke will not cause the claw core 3 to disengage from the fine clamp nut 5.

[0050] In addition, to improve the clamping effect of the chuck, in this embodiment, the clamping surface of the jaw 2 is designed as a V-shaped concave surface, extending along the axial direction of the connecting body 1. The included angle of the V-shaped clamping surface of the jaw 2 is preferably 160-170 degrees. Figure 4 and Figure 5 As shown.

[0051] The V-shaped concave clamping surface increases the contact points between the jaws 2 and the clamped drill bit, improving friction and thus enhancing clamping stability and providing torque assurance. The almost planar angle design increases the contact points with the clamped drill bit while avoiding damage to the original structural strength of the jaws 2, especially the structural strength of the clamping surface.

[0052] Unlike the gripper 2, the gripper core 3 has a flat clamping surface. Since the gripper core 3 is relatively thin, the flat surface better ensures the structural strength of the clamping surface, guaranteeing the stability of the ultra-fine drill bit. Furthermore, the ultra-fine drill bit requires relatively low torque for drilling, which the flat clamping surface can meet.

[0053] In addition, in this embodiment, when the rear end of the claw core 3 contacts the rear side wall of the receiving groove 22, the clamping surface of the claw core 3 is located inside the receiving groove 22, so as to avoid interfering with the contact between the rough drill bit and the jaw 2 when clamping the rough drill bit.

[0054] For example Figure 2 and Figure 3 As shown, the connecting body 1 is provided with a retaining ring 12, which is located behind the coarse clamping nut 4 and restricts the axial position of the coarse clamping nut 4. The retaining ring 12 is provided with a through hole for the clamping claw 2 to pass through.

[0055] The coarse clamp nut 4 presses against the retaining ring 12, and the fine clamp nut 5 presses against the coarse clamp nut 4. The front side of the fine clamp nut 5 is axially limited by the front shell, and the front end of the front shell is axially limited by a snap ring. Through the cooperation of the retaining ring 12 and the front cover 6, the conical nut is clamped between the two for movement and limitation, thereby stably installing the coarse clamp nut 4 and the fine clamp nut 5 on the connecting body 1.

[0056] In addition, thrust ball bearings (not shown in the figure) can be provided between the coarse clamp nut 4 and the retaining ring 12 and between the fine clamp nut 5 and the coarse clamp nut 4 to change sliding friction to rolling friction and improve the smoothness of rotation of the two nuts.

[0057] The connecting body 1 is also provided with a limiting ring 13, located behind the retaining ring 12, which is used to block the gripper 2, limit the extreme position of the gripper 2 to move backward, and prevent the gripper 2 from moving backward excessively. At the same time, when multiple grippers 2 are installed, it can play the role of aligning the grippers 2, avoiding the error of manual alignment, and ensuring the clamping accuracy of the gripper 2.

[0058] The drill chuck in this embodiment has three covers: a front cover 6, a middle cover 7, and a rear cover 8, which protect the connecting body 1, the jaws 2, and the conical nut. The middle cover 7 is sandwiched between the front cover 6 and the rear cover 8.

[0059] All three covers are fitted onto the connecting body 1. The rear cover 8 is fixedly connected to the rear end of the connecting body 1, while the middle cover 7 and the front cover 6 are rotatably connected to the connecting body 1 on the same axis.

[0060] In this embodiment, in order for the front cover 6 and the middle cover 7 to drive the fine clamping nut 5 and the coarse clamping nut 4 to rotate synchronously, respectively, the front cover 6 and the middle cover 7 are connected to the fine clamping nut 5 and the coarse clamping nut 4 through a snap-fit ​​structure. The specific structural form of this snap-fit ​​structure can be found in [reference needed]. Figure 2 As shown, since this is a conventional technique in this field, it will not be described in detail here.

[0061] For example Figure 1 and Figure 2 As shown, in this embodiment, when it is necessary to move the gripper 2 and the gripper core 3 synchronously, the front cover 6 and the middle cover 7 need to be rotated synchronously. To ensure that the two covers can rotate synchronously, a locking block 61 is slidably connected to the rear side of the front cover 6, and the middle cover 7 is provided with a slot 71 for the locking block 61 to slide into. When it is necessary to rotate the front cover 6 and the middle cover 7 synchronously, the locking block 61 is pushed to slide into the slot 71, locking and limiting the front cover 6 and the middle cover 7, thereby allowing the front cover 6 and the middle cover 7 to rotate synchronously. When it is only necessary to rotate the fine clamp nut 5, the locking block 61 is slid away from the slot 71, allowing the front cover 6 and the middle cover 7 to separate and rotate independently.

[0062] This utility model provides a universal drill chuck for both coarse and fine drill bits. A claw core 3 slides within the jaws 2, and two nuts, a coarse clamping nut 4 and a fine clamping nut 5, are also provided. When a coarse drill bit needs to be clamped, the coarse clamping nut 4 and the fine clamping nut 5 are rotated synchronously, causing the jaws 2 and claw core 3 to slide simultaneously, thus clamping the coarse drill bit through the jaws 2. When a fine drill bit needs to be clamped, the claw core 3 is extended separately by adjusting the fine clamping nut 5 to clamp the fine drill bit. This achieves a single chuck that can clamp both coarse and fine drill bits without the need for additional equipment or chuck replacement, greatly improving the ease of use of the drill chuck.

Claims

1. A universal drill chuck for both coarse and fine applications, comprising a connecting body (1), a plurality of jaws (2) slidably connected to the connecting body (1), and a tapered nut threadedly connected to the plurality of jaws (2), wherein the front end of the connecting body (1) is for inserting a drill bit, characterized in that, A claw core (3) is slidably connected inside the gripper (2). The claw core (3) extends and slides in the same direction as the gripper (2). The front end of the claw core (3) can extend out of the front end of the gripper (2). The width of the claw core (3) in the circumferential direction of the connecting body (1) is less than the width of the gripping surface of the gripper (2). The claw core (3) is provided with threaded teeth, and the threaded teeth of the claw core (3) can coincide with the threaded teeth of the gripper (2). The surface of the gripper (2) where the threaded teeth are provided is provided with a toothless area (21), which can expose the threaded teeth of the claw core (3). The conical nut includes a coarse clamp nut (4) and a fine clamp nut (5). The fine clamp nut (5) is located in front of the coarse clamp nut (4). When multiple jaws (2) are clamped without blades and the jaw core (3) is not extended, the thread teeth at the rear end of the jaw core (3) are located in the toothless area (21) of the jaw (2) and are threadedly connected to the fine clamp nut (5). The coarse clamp nut (4) is threadedly connected to the thread teeth on the jaw (2) located behind the toothless area (21). The connecting body (1) is fitted with a front cover (6), a middle cover (7) and a rear cover (8) arranged in a front-to-back manner. The front cover (6) and the middle cover (7) are rotatably connected to the connecting body (1), and they are respectively connected to the fine clamp nut (5) and the coarse clamp nut (4) and rotate synchronously.

2. The universal drill chuck for both coarse and fine drill bits as described in claim 1, characterized in that, The claw core (3) is plate-shaped, and the plate surface is parallel to the radial plane of the connecting body (1).

3. The universal drill chuck for both coarse and fine drill bits as described in claim 2, characterized in that, The claw core (3) is located on the symmetrical plane of the gripper (2).

4. The universal drill chuck for both coarse and fine drill bits as described in claim 1, characterized in that, The gripper (2) is provided with a receiving groove (22) for accommodating the gripper core (3). The receiving groove (22) is connected to the front end of the gripper (2) and the surface with threaded teeth. The rear side wall of the receiving groove (22) is located at the rear side of the toothless area (21) of the gripper (2).

5. A universal drill chuck for both coarse and fine drill bits as described in claim 1, characterized in that, The clamping surface of the gripper (2) is a V-shaped concave surface that extends along the axial direction of the connecting body (1).

6. A universal drill chuck for both coarse and fine drill bits as described in claim 5, characterized in that, The included angle of the V-shaped clamping surface of the gripper (2) is 160-170 degrees.

7. A universal drill chuck for both coarse and fine drill bits as described in claim 6, characterized in that, The front end of the claw core (3) is also provided with a clamping surface facing the central axis of the connecting body (1). This clamping surface is a plane and extends along the axial direction of the connecting body (1).

8. A universal drill chuck for both coarse and fine drill bits as described in claim 1, characterized in that, The connecting body (1) is provided with a retaining ring (12) located behind the coarse clamp nut (4), and the retaining ring (12) is provided with a through hole for the clamping claw (2) to pass through.

9. A universal drill chuck for both coarse and fine drill bits as described in claim 8, characterized in that, The connecting body (1) is provided with a limiting ring (13), which is located behind the retaining ring (12) and can block the gripper (2).

10. A universal drill chuck for both coarse and fine applications as described in claim 1, characterized in that, The front cover (6) has a sliding connection to a locking block (61) on the rear side, and the middle cover (7) has a slot (71) for the locking block (61) to slide into.

Images