Drill bit locking device of handheld electric drill

Abstract

The utility model provides a handheld electric drill bit locking device which comprises a drill bit seat, a drill bit clamp fixedly installed at the front end of the drill bit seat, a drill bit installed in the middle of the interior of the drill bit clamp, a plurality of clamping blocks arranged on the periphery of the front end and the periphery of the rear end of the drill bit clamp in a penetrating mode, wedge-shaped blocks fixedly installed at the top ends of the clamping blocks, and arc-shaped blocks fixedly installed at the bottom ends of the clamping blocks. Locking mechanisms are arranged on the periphery of the drill bit clamp and further located on the periphery of the multiple wedge-shaped blocks, springback mechanisms are arranged on the periphery of the interior of the front end and the periphery of the interior of the rear end of the drill bit clamp correspondingly, and the springback mechanisms are further located on the periphery of the multiple clamping blocks. According to the locking device for the drill bit of the handheld electric drill, through the cooperation effect of the locking mechanism and the rebounding mechanism, firm and stable clamping and positioning and convenient and rapid disassembly and replacement of the drill bit are achieved, and the use efficiency and convenience of the electric drill are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of handheld electric drills, and more specifically to a handheld electric drill bit locking device. Background Art

[0002] A handheld electric drill is a common portable power tool, usually used for drilling, screw tightening and other light DIY work. It consists of a motor, a drill clamping device, a handle, a switch and a power cord. The user can operate the handheld electric drill by holding the handle and aiming the drill at the workpiece to drill or tighten screws. The drill chuck of an existing hand drill generally does not have a self-locking adjustment function. The drill chuck may be unable to clamp due to wear. During use, the drill chuck may become loose, which may cause the drilling to deviate or even the drill bit to fall off, posing a threat to the safety of the user. Some drill chucks with a self-locking function are laborious to lock and inconvenient to adjust.

[0003] In view of the above problems, regarding the technical problem that the existing drill chuck locking adjustment is laborious and inconvenient, after a lot of searching, a handheld electric drill bit locking device with patent number CN216729701U was found, which belongs to the field of electric tool technology. The device includes a locking sleeve, which is provided with an internal thread and can be connected with the drill chuck through threaded cooperation. A plurality of clamping blocks are arranged in the locking sleeve, each of which is provided with a mounting through hole. The elastic member passes through the mounting through hole on each clamping block, so that each clamping block is connected in series. The cross section of the clamping block is trapezoidal, and the end of the locking sleeve away from the drill chuck is conical. By rotating the locking sleeve, each clamping block can be pressed together to move it closer to each other, thereby clamping the drill bit; the device has a simple structure and is easy to operate. The clamping degree of the drill bit can be adjusted to prevent it from falling off or drilling deviation, and it is convenient to replace the drill bit, but the technical solution provided by the patent has the following problems:

[0004] (1) The drill chuck is connected in series through a single elastic member, which means that the outward expansion of the drill chuck is provided by this elastic member. After a period of use, the elastic performance of the elastic member will decrease, so that when the drill bit is replaced, the drill chuck cannot expand and loosen, thereby making it impossible to quickly replace the drill bit;

[0005] (2) When installing the drill bit, one end of the drill bit is usually inserted into the drill chuck. Since the drill bit is inserted and fixed in the drill chuck only by one end, this single-point fixing method can easily cause the drill bit to shake or deviate during operation, thereby reducing the stability of the drill bit.

[0006] The utility model can enable the drill chuck to be opened quickly when the drill bit is replaced, so that the drill bit can be taken out and replaced, and can be fixed at multiple points when the drill bit is locked, so that the drill bit can be firmly installed. Utility Model Content

[0007] The utility model aims to solve the technical problems raised by the above-mentioned background technology and provides a handheld electric drill bit locking device. By setting a locking mechanism, the clamping blocks at two positions of the drill bit can be locked at the same time, so that the drill bit is more stable after being locked. By setting a rebound mechanism, the clamping block can be quickly expanded and moved outward when it is not restricted, so as to facilitate the removal of the drill bit.

[0008] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a hand-held electric drill bit locking device, comprising: a drill bit seat, a drill bit clamp is fixedly installed at the front end of the drill bit seat, a drill bit is installed in the middle of the drill bit clamp, a plurality of clamping blocks are penetrated around the front end and the rear end of the drill bit clamp, a plurality of wedge blocks are fixedly installed at the top ends of the clamping blocks, a plurality of arc blocks are fixedly installed at the bottom ends of the clamping blocks, a locking mechanism is arranged around the drill bit clamp, the locking mechanism is also located around the plurality of wedge blocks, a rebound mechanism is arranged around the front end and the rear end of the drill bit clamp, and the rebound mechanism is also located around the plurality of clamping blocks.

[0009] A further preferred solution: the locking mechanism comprises: a rotating drum, a front cone sleeve, a rear cone sleeve and a fixing rod;

[0010] The rotary drum is sleeved on the middle end of the drill clamp, the front cone sleeve and the rear cone sleeve are sleeved on the front end and the rear end of the rotary drum respectively, and a plurality of fixing rods are fixedly mounted around the middle end of the rotary drum.

[0011] A further preferred solution: the rebound mechanism comprises: an adjustment cavity, a slider, a return spring, a rubber ball and a permanent magnet;

[0012] The adjusting cavities are evenly opened around the inner wall of the drill clamp, the slider is fixed around the middle end of the clamp, the reset spring is fixed between the upper part of the adjusting cavity and the slider, the rubber ball is fixed between the lower part of the adjusting cavity and the slider, and the inner top of the adjusting cavity, the top of the slider, the bottom of the slider and the inner bottom of the adjusting cavity are all fixed with permanent magnets.

[0013] A further preferred solution is that the inner wall of the rotating cylinder is rotatably connected to the outer surface of the drill clamp, the front cone sleeve is threadedly connected to the front end of the rotating cylinder, and the rear cone sleeve is threadedly connected to the rear end of the rotating cylinder.

[0014] A further preferred solution: one end of the front cone sleeve and the rear cone sleeve are both truncated cone-shaped, and the ends of the front cone sleeve and the rear cone sleeve that are truncated cone-shaped are both located around a plurality of wedge blocks. Guide grooves that are slidably connected to the tops of the wedge blocks are also provided around the inner walls of the ends of the front cone sleeve and the rear cone sleeve that are truncated cone-shaped.

[0015] A further preferred solution is that the slider is slidably connected to the inner wall of the adjustment cavity on all sides, the permanent magnets located at the top of the adjustment cavity and the top of the slider attract each other with opposite charges, and the permanent magnets located at the bottom of the slider and the bottom of the adjustment cavity repel each other with the same charge.

[0016] A further preferred solution is that the multiple clamping blocks located around the front end of the drill clamp and the multiple clamping blocks located around the rear end of the drill clamp are symmetrically arranged, and the multiple clamping blocks are slidably connected to the inner wall of the adjustment cavity on all sides.

[0017] A further preferred solution is that the plurality of clamping blocks are divided into two groups, which are respectively located around the front end and the rear end of the drill clamp, and each group is provided with six clamping blocks and distributed in a circular array.

[0018] Beneficial effects:

[0019] 1. By setting a locking mechanism, when the rotary drum is rotated, the front cone sleeve and the rear cone sleeve respectively connected to the two ends of the rotary drum with threads can be moved away from each other, so that the front cone sleeve and the rear cone sleeve can be respectively fitted around the two groups of wedge blocks, and the two groups of wedge blocks are squeezed through the inner wall of the rotary drum, so that the clamping blocks and arc blocks connected by the two groups of wedge blocks move toward the front and rear ends of the drill clamp, and finally the two groups of arc blocks are clamped at two points of the drill bit respectively. By clamping and positioning the two points of the drill bit, the drill bit is more firm and stable after installation;

[0020] 2. By setting a rebound mechanism, when the clamping block moves toward the drill bit clamp under the action of the locking mechanism, the slider fixedly connected to the clamping block can slide inward in the adjusting cavity, thereby stretching the reset spring, squeezing the rubber ball to produce deformation, and allowing the permanent magnets at the top of the adjusting cavity and the top of the slider to move away from each other, and allowing the permanent magnets at the bottom of the slider and the bottom of the adjusting cavity to move closer to each other. When the locking mechanism no longer restricts the wedge block, the clamping block will no longer be restricted by external force. Thereafter, under the combined force of the reset elastic force of the reset spring, the deformation recovery of the rubber ball, the oppositely attracted permanent magnets at the top of the adjusting cavity and the top of the slider, and the like-repelling permanent magnets at the bottom of the slider and the bottom of the adjusting cavity, the slider can slide outward in the adjusting cavity, thereby driving the clamping block and the arc block connected to it away from the drill bit, thereby loosening the drill bit. The rebound mechanism makes it more convenient to disassemble and replace the drill bit, and it is not easy to be affected by fatigue of a single spring.

[0021] 3. In summary, the handheld electric drill bit locking device is provided with the cooperation of the locking mechanism and the rebound mechanism, which realizes the firm and stable clamping and positioning of the drill bit and the convenient and quick disassembly and replacement, thereby improving the use efficiency and convenience of the electric drill. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0023] Figure 2 It is a schematic diagram of the three-dimensional structure of the utility model after the front cone sleeve and the rear cone sleeve are unscrewed.

[0024] Figure 3 It is a schematic diagram of the exploded structure of the locking mechanism of the utility model.

[0025] Figure 4 It is a schematic diagram of the cross-sectional structure of the drill chuck of the utility model.

[0026] Figure 5 For the utility model Figure 4 A in the figure is an enlarged structural diagram.

[0027] Figure 1-5 Middle: 1. Drill bit holder; 2. Drill bit clamp; 3. Drill bit; 4. Rotating cylinder; 5. Front cone sleeve; 6. Rear cone sleeve; 7. Fixed rod; 8. Clamp block; 801. Wedge block; 802. Arc block; 9. Adjustment chamber; 10. Slider; 11. Return spring; 12. Rubber ball; 13. Permanent magnet. DETAILED DESCRIPTION

[0028] The following will be combined with the attached embodiment of the present utility model Figure 1-Figure 5 , clearly and completely describe the technical solutions in the embodiments of the utility model.

[0029] See also Figure 1-5 In the embodiment of the utility model, a handheld electric drill bit locking device comprises: a drill bit seat 1 is an integral structure, fixing a drill bit clamp 2 and a drill bit 3, and playing a supporting and connecting role; the drill bit clamp 2 is installed at the front end of the drill bit seat 1, and a drill bit 3 is installed inside, and its main function is to fix and clamp the drill bit 3, and to fix and remove the drill bit 3 through a locking mechanism and a rebound mechanism; the locking mechanism is located around the drill bit clamp 2, and is also located around a plurality of wedge blocks 801, and the function of the locking mechanism is to push the wedge The arc block 801 is limited to ensure that the arc block 802 firmly clamps the drill bit 3; the rebound mechanism is located around the front end and the rear end of the drill clamp 2, and is also located around the multiple clamping blocks 8. The function of the rebound mechanism is to make the clamping block 8 and the arc block 802 connected to it move away from the drill bit 3 through the rebound force after the locking mechanism is released, so as to loosen the drill bit 3; the clamping block 8 runs through the front and rear ends of the drill clamp 2, with a wedge block 801 fixed on the top and an arc block 802 fixed on the bottom.

[0030] In the embodiment of the utility model, the locking mechanism includes: a rotating cylinder 4, a front cone sleeve 5, a rear cone sleeve 6 and a fixing rod 7; the rotating cylinder 4 is sleeved on the middle end of the drill clamp 2, is the core component of the locking mechanism, and the outer surfaces of the front and rear ends are respectively provided with threaded structures; the front cone sleeve 5 and the rear cone sleeve 6 are respectively sleeved on the front and rear ends of the rotating cylinder 4, and are connected to the external threads on the rotating cylinder 4 through internal threads; the fixing rod 7 is formed into a plurality of surroundings fixedly mounted on the middle end of the rotating cylinder 4, and the rotating cylinder 4 is rotated by holding the fixing rod 7; the rotating cylinder 4, the front cone sleeve 5, the rear cone sleeve 6 and the fixing rod 7 are the key components of the locking mechanism in the handheld electric drill bit locking device, and the drill bit is firmly clamped and accurately positioned through operations such as rotation, movement and fixation.

[0031] In the embodiment of the utility model, the rebound mechanism includes: an adjusting cavity 9, a slider 10, a reset spring 11, a rubber ball 12 and a permanent magnet 13; the adjusting cavity 9 is a plurality of evenly opened around the inner wall of the drill clamp 2, providing a space for the slider 10, the reset spring 11, the rubber ball 12 and the permanent magnet 13 to move, and plays a role in accommodating these components; the slider 10 is fixedly mounted around the clamp block 8, and can slide inward or outward in the adjusting cavity 9, and the movement of the slider 10 is affected by the reset spring 11, the rubber ball 12 and the permanent magnet 13; the reset spring 11 is fixedly mounted between the upper part of the adjusting cavity 9 and the slider 10, and has a restoring force. When the clamp block 8 moves inward, the reset spring 11 is stretched to store energy. When the external force is released, the reset spring 11 will return to its original state, pushing the slider 1 0 slides outward; the rubber ball 12 is fixed between the lower part of the adjusting cavity 9 and the slider 10, and can be squeezed to produce deformation. During the movement of the clamping block 8, the deformation of the rubber ball 12 can provide additional buffering and adjustment effects, making the rebound process more stable; the permanent magnets 13 are respectively fixed at the top of the adjusting cavity 9, the top of the slider 10, the bottom of the slider 10 and the bottom of the adjusting cavity 9. The interaction of the permanent magnets 13 can affect the position and movement direction of the slider 10, and the movement of the slider 10 is controlled by the attraction and repulsion of the magnetic force; the adjusting cavity 9, the slider 10, the reset spring 11, the rubber ball 12 and the permanent magnet 13 work together to realize the automatic rebound function of the clamping block 8 through spring force, rubber deformation and magnetic force, so that the replacement of the drill bit 3 is more convenient and stable.

[0032] In the embodiment of the utility model, the outer surface of the rotating drum 4 and the drill clamp 2 are connected by rotation, which means that the rotating drum 4 can rotate relative to the drill clamp 2; in addition, the front cone sleeve 5 is connected to the front end of the rotating drum 4 by threads, and the rear cone sleeve 6 is also connected to the rear end of the rotating drum 4 by threads. This design can ensure that the front cone sleeve 5 and the rear cone sleeve 6 are stably connected to the front and rear ends of the rotating drum 4.

[0033] In the embodiment of the utility model, one end of the front cone sleeve 5 and the rear cone sleeve 6 are both truncated cone-shaped, and the ends of the front cone sleeve 5 and the rear cone sleeve 6 are both located around a plurality of wedge blocks 801. The inner walls of the ends of the front cone sleeve 5 and the rear cone sleeve 6 are also provided with guide grooves slidably connected to the tops of the wedge blocks 801. The design of the guide grooves can ensure that the wedge blocks 801 are correctly aligned with the front cone sleeve 5 and the rear cone sleeve 6, and enable them to maintain a stable position during assembly and movement, thereby playing a guiding and limiting role.

[0034] In the embodiment of the utility model, the slider 10 is slidably connected to the inner wall of the adjusting cavity 9 on all sides, which means that the slider 10 can slide smoothly in the adjusting cavity 9; in addition, the permanent magnets 13 located at the top of the adjusting cavity 9 and the bottom of the slider 10 attract each other with opposite charges, while the permanent magnets 13 located at the bottom of the slider 10 and the bottom of the adjusting cavity 9 repel each other with the same charge. By setting a magnetic attraction and repulsion relationship between the slider 10 and the adjusting cavity 9, the position and movement direction of the slider 10 can be effectively adjusted and controlled.

[0035] In the embodiment of the utility model, multiple clamping blocks 8 located around the front end of the drill bit clamp 2 and multiple clamping blocks 8 located around the rear end of the drill bit clamp 2 are symmetrically arranged, and the multiple clamping blocks 8 are slidably connected to the inner wall of the adjustment cavity 9 on all sides. The symmetrical arrangement of the multiple clamping blocks 8 can provide uniform support and clamping force to ensure stable fixation of the drill bit 3. The clamping blocks 8 are slidably connected to the inner wall of the drill bit clamp 2 so that the clamping blocks 8 can slide smoothly along the inner wall of the drill bit clamp 2. By adjusting the position of the clamping blocks 8, it is possible to flexibly adapt to drill bits 3 of different sizes and realize the function of clamping or releasing the drill bit 3.

[0036] In the embodiment of the utility model, a plurality of clamping blocks 8 are divided into two groups, and the two groups are respectively located around the front end and the rear end of the drill bit clamp 2, and each group is provided with six clamping blocks and distributed in a circular array. By dividing the clamping blocks 8 into two groups, a uniform clamping force distribution at the front end and the rear end of the drill bit clamp 2 can be achieved. Six clamping blocks 8 are respectively provided at the front end and the rear end, and the clamping force can be evenly applied at the front and rear ends to ensure that the clamping effect of the drill bit clamp 2 on the drill bit 3 is more balanced. The circular array distribution helps to make the contact between the clamping blocks 8 and the inner wall of the drill bit clamp 2 more uniform, thereby improving the stability and reliability of the clamping.

[0037] Working principle: First, insert the drill bit 3 into the drill bit holder 2; then, when rotating the drum 4, the front cone sleeve 5 and the rear cone sleeve 6, which are respectively connected to the front and rear ends of the drum 4 by threads, can be moved away from each other, so that the front cone sleeve 5 and the rear cone sleeve 6 can be respectively fitted around the two groups of wedge blocks 801, and the two groups of wedge blocks 801 are squeezed through the inner walls of the front cone sleeve 5 and the rear cone sleeve 6, so that the clamping block 8 and the arc block 802 connected by the two groups of wedge blocks 801 are moved around the front end and the rear end of the drill bit holder 2. The drill bit 3 is moved around, and finally the two groups of arc blocks 802 are clamped at two points of the drill bit 3 respectively. By clamping and positioning the two points of the drill bit 3, the drill bit 3 is more firmly and stably installed; at the same time, when the clamping block 8 moves toward the drill clamp 2 under the action of the locking mechanism, the slider 10 fixedly connected to the clamping block 8 can slide inward in the adjusting cavity 9, so that the reset spring 11 can be stretched, the rubber ball 12 can be squeezed to produce deformation, and the permanent magnet 13 located at the top of the adjusting cavity 9 and the top of the slider 10 can be moved away from each other, and the permanent magnet 13 located at the bottom of the slider 10 and the bottom of the adjusting cavity 9 can be moved closer to each other; at the same time, when the drill bit 3 needs to be replaced, the rotating drum 4 can be rotated in the opposite direction to make the front cone sleeve 5 and the rear cone sleeve 6 approach each other, so that the front cone sleeve 5 and the rear cone sleeve 6 are respectively away from the two groups of wedge blocks 801; at the same time, when the locking mechanism no longer restricts the wedge block 801, the clamping block 8 will no longer be restricted by external force, and then the reset spring 11 resets the elastic force, the rubber ball 1 Under the joint force of deformation recovery, the oppositely charged permanent magnets 13 located at the top of the adjusting cavity 9 and the top of the slider 10 and the like-charged permanent magnets 13 located at the bottom of the slider 10 and the bottom of the adjusting cavity 9 and repelling each other, the slider 10 can slide outward in the adjusting cavity 9, thereby driving the clamping block 8 and the arc block 802 connected thereto away from the drill bit 3, thereby loosening the drill bit 3. The rebound mechanism makes it easier to disassemble and replace the drill bit 3, and it is not easy to be affected by fatigue of a single spring.

Claims

1. A handheld electric drill bit locking device, comprising: A drill bit holder (1) is characterized in that: a drill bit holder (2) is fixedly mounted at the front end of the drill bit holder (1), a drill bit (3) is installed in the middle of the drill bit holder (2), a plurality of clamping blocks (8) are penetrated around the front end and the rear end of the drill bit holder (2), a wedge block (801) is fixedly mounted on the top of the plurality of clamping blocks (8), an arc block (802) is fixedly mounted on the bottom of the plurality of clamping blocks (8), a locking mechanism is arranged around the drill bit holder (2), and the locking mechanism is also located around the plurality of wedge blocks (801), and a rebound mechanism is arranged around the front end and the rear end of the drill bit holder (2), and the rebound mechanism is also located around the plurality of clamping blocks (8).

2. A handheld electric drill bit locking device according to claim 1, characterized in that: The locking mechanism comprises: a rotating drum (4), a front cone sleeve (5), a rear cone sleeve (6) and a fixing rod (7); The rotary drum (4) is sleeved on the middle end of the drill bit holder (2), the front cone sleeve (5) and the rear cone sleeve (6) are sleeved on the front end and the rear end of the rotary drum (4) respectively, and a plurality of fixing rods (7) are fixedly mounted around the middle end of the rotary drum (4).

3. The handheld electric drill bit locking device according to claim 1, characterized in that: The rebound mechanism comprises: an adjustment chamber (9), a slider (10), a return spring (11), a rubber ball (12) and a permanent magnet (13); A plurality of adjusting cavities (9) are evenly arranged around the inner wall of the drill clamp (2); a slider (10) is fixedly mounted around the middle end of the clamp block (8); a return spring (11) is fixedly mounted between the upper part of the adjusting cavity (9) and the slider (10); a rubber ball (12) is fixedly mounted between the lower part of the adjusting cavity (9) and the slider (10); and permanent magnets (13) are fixedly mounted on the top of the adjusting cavity (9), the top of the slider (10), the bottom of the slider (10) and the bottom of the adjusting cavity (9).

4. A handheld electric drill bit locking device according to claim 2, characterized in that: The inner wall of the rotating cylinder (4) is rotatably connected to the outer surface of the drill clamp (2), the front cone sleeve (5) is threadedly connected to the front end of the rotating cylinder (4), and the rear cone sleeve (6) is threadedly connected to the rear end of the rotating cylinder (4).

5. The handheld electric drill bit locking device according to claim 2, characterized in that: One end of the front cone sleeve (5) and the rear cone sleeve (6) are both arranged in a truncated cone shape, and the one end of the front cone sleeve (5) and the rear cone sleeve (6) arranged in a truncated cone shape are both located around a plurality of wedge-shaped blocks (801), and the inner wall of the one end of the front cone sleeve (5) and the rear cone sleeve (6) arranged in a truncated cone shape is also provided with a guide groove slidably connected to the top of the wedge-shaped block (801) around the inner wall.

6. The handheld electric drill bit locking device according to claim 3, characterized in that: The slider (10) is slidably connected to the inner wall of the adjusting cavity (9) on all sides; the permanent magnet (13) located at the top of the adjusting cavity (9) and the permanent magnet (13) located at the top of the slider (10) attract each other due to their opposite polarity, and the permanent magnet (13) located at the bottom of the slider (10) and the permanent magnet (13) located at the bottom of the adjusting cavity (9) repel each other due to their like polarity.

7. The handheld electric drill bit locking device according to claim 1, characterized in that: A plurality of clamping blocks (8) located around the front end of the drill bit clamp (2) and a plurality of clamping blocks (8) located around the rear end of the drill bit clamp (2) are symmetrically arranged, and the plurality of clamping blocks (8) are all slidably connected to the inner wall of the adjustment cavity (9) around their peripheries.

8. The handheld electric drill bit locking device according to claim 1, characterized in that: The plurality of clamping blocks (8) are divided into two groups, which are respectively located around the front end and the rear end of the drill clamp (2), and each group is provided with six clamping blocks and distributed in a circular array.

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