Hand tight drill chuck

Abstract

The application provides a hand drill chuck, which comprises a rotating sleeve, a drill body, a nut, a clamping jaw, a gasket and a sliding assisting assembly, the sliding assisting assembly comprises a circle of steel balls; the drill chuck is provided with a fixed stop component in the middle part of the drill chuck, the stop component is connected with the gasket in a rotation preventing mode and cannot rotate relative to the drill body, the stop component is provided with a stop part; a steel ball pushing structure is formed between the nut and the nut supporting structure, when the drill chuck is in a clamping jaw clamping state, the steel balls are pushed and extruded outward by the pushing force received by the nut, the sliding assisting assembly pushes the stop part outward to combine with the rotating sleeve, when the drill chuck is in a clamping jaw releasing state, the stop part is retracted to be separated from the rotating sleeve. The application plays a role of resisting high inertia and preventing loosening for the rotating sleeve on the basis of the original structure of the drill chuck, so that the drill chuck can keep the original clamping state when the drill chuck encounters an emergency stop in the drilling work, and the self-locking state of the self-locking drill chuck can also be kept.

Description

TECHNICAL FIELD

[0001] The present application relates to drill chuck, especially hand-tight drill chuck, which is a drill chuck without wrench operation. BACKGROUND

[0002] The drill chuck is provided with a drill body, a clamping jaw and a nut, the nut is threadedly connected with the clamping jaw, the hand-tight drill chuck is provided with a rotating sleeve, the rotating sleeve is directly or through a connecting structure connected with the nut, the rotating sleeve is manually operated to rotate the nut so as to drive the clamping jaw to move forward or backward to tighten or release the drill bit.

[0003] With the development of lithium battery technology, the rotation speed of the electric drill is getting faster and faster. When the electric drill is working, the inertia will be generated instantaneously when the electric drill stops from high speed, and the drill chuck will be self-loosened due to the sudden stop of the electric drill, which is manifested as that the nut rotates in the opening direction of the clamping jaw of the drill chuck due to inertia, resulting in the release of the drill bit or the failure of the locking state of the drill chuck. When the drill chuck is applied to the electric wrench, the drill chuck is also easily self-loosened due to the large reverse impact.

[0004] In addition, during the impact operation of the drill chuck, when the electric drill vibrates greatly, the nut is easily rotated in the opening direction, resulting in the falling of the drill tool clamped by the clamping jaw and the failure to use normally.

[0005] Generally, the method for solving the self-loosening of the drill chuck due to inertia or reverse impact or vibration during the operation of the drill chuck is to set a self-locking structure on the drill chuck, which is usually to set a ring of ratchet teeth on the drill body of the drill chuck, and to prevent self-loosening by the cooperation of the spring sheet fixed on the nut or the nut sleeve and the ratchet teeth. However, such structure is complex, assembly is cumbersome, and cost is high.

[0006] In order to solve the above technical problems, Chinese patent CN209681190U discloses a drill chuck, which sets an inclined surface on the nut or the washer, sets an expandable and recoverable ring body between the nut and the washer to form a steel ball pushing structure, and makes the steel ball push and extrude the deformed ring body to be connected with the rotating sleeve. Since the washer is fixedly connected with the drill body, and the rotating sleeve is fixedly connected with the nut, the pushing structure finally makes the nut, the rotating sleeve, the ring body, the steel ball and the washer form an integral whole by relying on the friction between the steel ball and the washer after the drill chuck is clamped. The advantage of this structure is that it is simple to set an inclined surface on the nut or the washer of the ordinary drill chuck. However, since the steel ball and the washer are in rolling friction, sliding is easily generated. Under the action of inertia at high speed or under the action of large impact operation, this structure is easily failed and cannot be adapted to the drill chuck for such purpose. SUMMARY

[0007] The technical problem to be solved by this invention is to provide a hand-tightening drill chuck that not only resists inertia and prevents loosening during operation, but also effectively prevents the nut from loosening from the jaws due to vibration. Furthermore, it has a simple structure and low cost. Therefore, this invention adopts the following technical solution:

[0008] A hand-operated drill chuck includes a rotating sleeve, a drill body, a nut, jaws, a washer, and a lubrication aid. The nut and jaws are threaded together. The rotating sleeve and nut are connected directly or through a connecting structure. The drill body has an inclined jaw hole for the jaws to slide back and forth along the jaw hole. The nut is fitted over the cylindrical part of the drill body. A nut support structure is provided behind the nut on the drill body. The nut support structure includes the washer. The washer and the drill body are anti-rotationally connected and cannot rotate relative to each other. The lubrication aid is provided between the nut and the washer. Its features are:

[0009] The sliding aid component includes a ring of steel balls; the drill chuck has a fixed stop component in the middle of the drill chuck, the stop component is connected to the anti-rotation washer and cannot rotate relative to the drill body, the stop component has a stop part, the stop part is located between the sliding aid component and the rotating sleeve;

[0010] A steel ball pushing structure is formed between the nut and the nut support structure. When the drill chuck is in the clamped state, the steel ball is pushed outward by the backward thrust of the nut. The lubrication component pushes the stop part outward to engage with the rotating sleeve. When the drill chuck is in the unclamped state, the stop part retracts and disengages from the rotating sleeve.

[0011] Based on the above technical solutions, the present invention may also employ the following further technical solutions, or combine these further technical solutions:

[0012] The stop component includes a ring body, which is fitted over the drill body and positioned behind the lubrication aid assembly. A fixing part is provided on the ring body, and the stop component is connected to the anti-rotation washer through the fixing part, preventing it from rotating relative to the drill body. On the ring body, multiple forward-bent stop claws are respectively provided along its circumference as stop parts. When the stop claws are engaged with the rotating sleeve, the stop claws and the rotating sleeve are squeezed together.

[0013] The ring body is located between the washer and the lubrication aid component or behind the washer; the washer is supported by a step in the middle of the drill body.

[0014] The nut is an integral nut; the washer is provided with a claw clearance hole; the ring body is also provided with a claw clearance hole; the fixing part is the bent part on both sides of the claw clearance hole of the ring body, and the bent part and the claw clearance hole of the washer form an anti-rotation fit.

[0015] The stop component includes a ring body, which is fitted over the drill body and positioned behind the lubrication aid assembly. Multiple forward-bending stop claws are arranged along the circumference of the ring body as stop points. When the stop claws engage with the rotating sleeve, they are tightly pressed together. The stop component has a fixing groove, and a key on the washer is inserted into the fixing groove to secure the stop component.

[0016] The fixing groove is the interval between the stop claws, the key is a partial extension protrusion on the outer circumference of the washer plane, and the ring body is located behind the washer.

[0017] The steel ball pushing structure includes a conical surface around the outer side of the rear end face of the nut; the sliding aid component is also centered through the conical surface.

[0018] The steel ball pushing structure includes a conical surface arranged on the outer side of the upper surface of the washer.

[0019] The ring body is located between the washer and the lubrication component, and the steel ball pushing structure includes a conical surface disposed on the outer side of the upper surface of the ring body.

[0020] The self-locking structure includes a spring plate mounted on a nut and a ring of teeth on the drill body that engage with the locking end of the spring plate. The spring plate includes a protrusion and the locking end. In the self-locking state, the spring plate is connected to the groove on the rotating sleeve through the protrusion, and the locking end of the spring plate engages with the teeth through a cam structure controlled by the rotating sleeve. The stop part engages with the rotating sleeve to maintain the self-locking state.

[0021] The rotating sleeve is made of a metal shell, and the drill chuck is also provided with a metal control ring. The metal control ring and the metal shell rotating sleeve are connected together in the circumferential direction by a keyway. The front part of the metal shell is provided with a folded edge, which cooperates with the front end face of the nut to axially position the metal control ring.

[0022] The drill chuck is equipped with a self-locking structure, which includes a spring plate mounted on a nut and a ring of teeth on the drill body that engage with the locking end of the spring plate. The spring plate includes a protrusion and the locking end. The metal control ring is provided with a control structure and a groove for the spring plate. In the self-locking state, the spring plate is connected to the groove on the rotating sleeve through the protrusion, and the rotating sleeve controls the locking end of the spring plate to engage with the teeth through the control structure. The stop part engages with the rotating sleeve to maintain the self-locking state.

[0023] The lubrication aid assembly includes a ring of steel balls and a deformable steel ball retainer. The steel balls are disposed in the steel ball holes of the steel ball retainer, and the steel balls protrude from the upper and lower surfaces of the lubrication aid assembly. The stop part is located between the steel ball retainer and the rotating sleeve. The steel ball retainer expands and deforms outward due to the outward pushing of the steel balls, pushing the stop part outward to engage with the rotating sleeve. When the drill chuck is in the open jaw state, the stop part and the steel ball plastic retainer retract, and the stop part disengages from the rotating sleeve.

[0024] The front end of the stop portion extends beyond the front end of the ball retainer, and the front end of the stop portion has an inward protrusion that covers the outer surface of the ball retainer.

[0025] The ball retainer has a closed-loop or open-loop structure, and the inner diameter of the ball retainer is larger than the diameter of the drill body; the lubrication aid is placed on the washer or on the stop component.

[0026] The sliding aid component includes a ring of steel balls; the ring of steel balls is placed on a washer or on the stop component; the stop part is located between the ring of steel balls and the rotating sleeve, and the distance between the stop claws is smaller than the diameter of the steel balls.

[0027] By employing the technical solution of this invention, a fixed stop component is provided in the middle of the drill body. In particular, the invention cleverly utilizes a washer with a clearance hole to fit the fixed stop component, allowing the stop portion to engage with the rotating sleeve. Because the stop component is connected to the washer via a ring without rotation, and the washer is fixedly connected to the drill body, rotating sleeve, and nut, the stop component ultimately achieves the effect of positioning and stopping the nut relative to the drill body. This provides resistance to high inertia and prevents loosening of the drill chuck, ensuring that the drill chuck maintains its original clamping state when encountering an emergency stop during drilling. Furthermore, for self-locking drill chucks, this invention can also serve as a mechanism for maintaining and protecting the self-locking state. Attached Figure Description

[0028] Figure 1 This is an exploded view of Embodiment 1 of the present invention.

[0029] Figure 2 This is a cross-sectional view of Embodiment 1 of the present invention.

[0030] Figure 3 This is a schematic diagram of the sliding aid component in Embodiment 1 of the present invention.

[0031] Figure 4 This is a schematic diagram of another embodiment of the sliding aid component of Embodiment 1 of the present invention.

[0032] Figure 5 This is a schematic diagram of the stop component in Embodiment 1 of the present invention.

[0033] Figure 6 This is a schematic diagram of the washer in Embodiment 1 of the present invention.

[0034] Figure 7 This is a cross-sectional view of Embodiment 2 of the present invention.

[0035] Figure 8 This is a schematic diagram of the stop component in Embodiment 2 of the present invention.

[0036] Figure 9 This is a cross-sectional view of Embodiment 3 of the present invention.

[0037] Figure 10 This is a schematic diagram of the cooperation between the stop component and the sliding aid component in Embodiment 3 of the present invention.

[0038] Figure 11 This is a cross-sectional view of Embodiment 4 of the present invention.

[0039] Figure 12 This is a schematic diagram of the assembly of the nut and spring plate in Embodiment 4 of the present invention.

[0040] Figure 13 This is an exploded view of Embodiment 4 of the present invention.

[0041] Figure 14 This is a cross-sectional view of Embodiment 4 of the present invention in the unlocked state.

[0042] Figure 15 This is a cross-sectional view of Embodiment 4 of the present invention in a self-locking state.

[0043] Figure 16 This is a schematic diagram of the assembly of the nut and spring plate in Embodiment 5 of the present invention.

[0044] Figure 17 This is a cross-sectional view of Embodiment 5 of the present invention in the unlocked state.

[0045] Figure 18 This is a cross-sectional view of Embodiment 5 of the present invention in a self-locking state.

[0046] Figure 19 This is a cross-sectional view of Embodiment 6 of the present invention.

[0047] Figure 20 This is a schematic diagram of the washer in Embodiment 7 of the present invention.

[0048] Figure 21 This is a schematic diagram of the stop component in Embodiment 7 of the present invention.

[0049] Figure 22 This is a cross-sectional view of Embodiment 8 of the present invention.

[0050] Figure 23 This is a schematic diagram of the metal rotating sleeve in Embodiment 8 of the present invention.

[0051] Figure 24 This is a schematic diagram of the metal control ring in Embodiment 8 of the present invention.

[0052] Figure 25 This is a cross-sectional view of Embodiment 8 of the present invention in the unlocked state.

[0053] Figure 26 This is a cross-sectional view of Embodiment 8 of the present invention in a self-locking state. Detailed Implementation

[0054] Example 1, refer to Appendix Figures 1-6 .

[0055] The hand-tightening drill chuck provided by the present invention includes a rotating sleeve 1, a drill body 5, a nut 2, a jaw 6, a sliding component and a washer 8. The sliding component adopts a bearing 7. The nut 2 and the jaw 6 are threadedly connected. The rotating sleeve 1 is connected to the nut 2 through a keyway. The drill body 5 is provided with an inclined jaw hole 51. The jaw 6 passes through the jaw hole 51 and can slide back and forth along the jaw hole 51 under the drive of the nut 2.

[0056] The nut 2 is fitted onto the outside of the cylindrical body of the drill body 5 to center it. A nut support structure is provided behind the nut 2 on the drill body 5, and the bearing 7 is positioned between the nut 2 and the nut support structure. The nut support structure includes the washer 8, which is supported by a step 52 in the middle of the drill body; the washer 8 is anti-rotationally connected to the drill body (e.g., with an interference fit and / or a keyway connection) and cannot rotate relative to the drill body. In this embodiment, the nut 2 is a single-piece nut, which reduces the diameter of the drill body 5 and helps reduce inertia. The washer 8 is anti-rotationally connected to the reduced-diameter drill body 5, and the washer 8 has a jaw clearance hole 81.

[0057] like Figure 3 As shown, the bearing 7 includes a ring of steel balls 71 and a sheet-like plastic retainer 72 for the steel balls. The plastic retainer 72 has a ring of steel ball holes, and the steel balls 71 are disposed in the steel ball holes of the plastic retainer 72. In the bearing, the steel balls 71 protrude from the upper and lower surfaces. Figure 4 As shown, the steel ball retainer can also adopt a metal open-ring structure, such as including an inner ring 73 and an outer ring 74. The steel ball is clamped and positioned between the inner ring 73 and the outer ring 74. Both the inner ring 73 and the outer ring 74 are open-ring structures with openings 75, which can expand outward and retract.

[0058] The drill chuck has a fixed stop component 9 in the middle of the drill chuck. The stop component 9 has a stop claw 91, which is located between the outer side 720 of the steel ball plastic retainer and the rotating sleeve 1.

[0059] A steel ball pushing structure is formed between the nut 2 and the nut support structure. When the drill chuck is in the clamping state, the backward thrust of the nut pushes the steel balls outward. The steel ball plastic retainer 72 deforms outward due to the outward push of the steel balls 71, pushing the stop pawl 91 to engage with the rotating sleeve 1. When the drill chuck is not working, the stop pawl 91 and the steel ball plastic retainer 72 retract, and the stop pawl disengages from the rotating sleeve. In this invention, the rotating sleeve 1 can be a main rotating sleeve made of engineering plastic, or it may also include inserts, sleeves, and other accessories fixedly connected to the main rotating sleeve.

[0060] The back thrust can come from the back thrust generated when the drill chuck is drilling, and the back thrust generated by the screw connection after tightening the nut to drive the jaws to move forward and clamp the drill bit.

[0061] The steel ball pushing structure includes a conical surface 20 on the outer side of the rear end face of the nut 2. An annular expansion opening is formed in the pushing structure. When the nut is subjected to the backward thrust generated by the drill chuck during drilling and the backward thrust generated by the screw connection after the nut is tightened and the jaws move forward to clamp the drill bit, the expansion opening can push the steel ball outward.

[0062] The outer surface of the stop pawl 91 and the rotating sleeve 1 are in a clearance fit under normal conditions (non-working state), and the clearance 90 is within the elastic deformation range of the stop pawl 91 and the steel ball plastic retainer 72. When the drill chuck is drilling, due to the back thrust, the steel ball 71 is squeezed outward, and the steel ball plastic retainer 72 is deformed to a certain extent outward due to the outward push of the steel ball 71, which pushes the stop pawl 91 to bend slightly outward and squeeze it tightly against the inner wall of the rotating sleeve 1. Since the stop component 9 is a fixed fastener that cannot rotate relative to the drill body 5, even if the bearing 7 rotates circumferentially, it does not affect the stopping effect of the stop component 9 on the rotating sleeve 1, which can resist inertia when the drill chuck stops suddenly, and can effectively resist the situation where the nut and the pawl loosen due to vibration. When the drill chuck is not working, the steel ball 71 loses its outward pushing force. Utilizing the good elastic deformation recovery ability of the steel stop pawl 91, the steel ball plastic retainer 72 and the stop pawl 91 together use the potential energy generated after deformation to recover inward and retract until they are disengaged from the rotating sleeve 1, resulting in better recovery performance.

[0063] The stop component 9 includes a ring body 92, which is fitted over the drill body 5 and located behind the bearing 7. A fixing part 93 is provided on the ring body 92, preventing the stop component 9 from rotating relative to the drill body 5 through the anti-rotation connection between the fixing part 93 and the washer 8. Multiple forward-bent stop claws 91 are respectively provided on the ring body 92 along its circumference. The stop claws 91 are elastic, capable of swinging outward under the push of the steel ball plastic retainer 72, and returning inward when the pushing force is lost. When the stop claws 91 are engaged with the rotating sleeve 1, the stop claws 91 and the rotating sleeve 1 are tightly pressed together, thus keeping the rotating sleeve 1 constantly stopped and resisting the high inertia during sudden stops of the drill chuck.

[0064] Corresponding to the jaw clearance hole 81 of the washer, the ring body 92 is also provided with jaw clearance hole 93. The fixing part is the bent part 94 on both sides of the jaw clearance hole 93 of the ring body. The stop part 9 is made of steel and can be easily manufactured by stamping process. Moreover, the special structure of the washer 8 can be cleverly utilized to give it additional functions. The bent part 94 and the two side hole walls 82 of the jaw clearance hole 81 of the washer 8 form an anti-rotation fit, and the stop part 9 is fixed to the drill body 5 by the washer 8.

[0065] Example 2, refer to Appendix Figures 7-8 .

[0066] The ring 92 is located between the washer 8 and the bearing 7 (see...). Figure 2 (The implementation method) or located between the washer 8 and the middle step 52 of the drill body (see) Figure 7 Implementation methods). For example... Figure 2 As shown, the ring body 92 is placed on the step 52 in the middle of the drill body, the washer 8 is placed on the ring body 92, and the bearing 7 is placed on the washer 8. Figure 7 As shown, washer 8 is placed on step 52 in the middle of the drill body, ring 92 is placed on washer 8, and bearing 7 is placed on ring 92. As shown, the front of the nut can be positioned by rotating sleeve 1, and the front of rotating sleeve 1 can be positioned by component 4 connected to drill body 5.

[0067] The front end of the stop claw 91 extends beyond the front end of the steel ball plastic retainer 72, and the front end of the stop claw has an inward protrusion 910, which covers the outer surface 720 of the steel ball plastic retainer. This can improve the compression effect, the compression fit performance with the rotating sleeve, and the recovery performance. At the same time, it can also serve to install the stop component 9 and the bearing 7 on the washer 8. The washer 8, the stop component 9, and the bearing 7 can form an installation module.

[0068] The steel ball plastic retainer 72 is annular, and its inner diameter is larger than that of the drill body 5. The bearing 7 can also be centered by the contact between the steel ball 71 and the conical surface 21. If the gap 90 is small, the bearing 7 can also be centered by the rotating sleeve 1 and the stop pawl 91.

[0069] exist Figure 7 , 8 In this document, the same components or structures as in Embodiment 1 are represented by the same reference numerals.

[0070] Example 3, refer to Appendix Figures 9-10 .

[0071] The sliding aid component may also omit the steel ball plastic retainer 72, with the ring of steel balls 71 placed on the washer 8 or on the ring body 92 of the stop component 9; the stop part employs multiple forward-bent stop claws 91 arranged circumferentially around the ring body, the stop claws 91 positioned between the ring of steel balls 71 and the rotating sleeve 7, and the width of the gap 93 between the stop claws 91 being smaller than the diameter of the steel balls 71. Figure 9 , 10 In this document, the same components or structures as in Embodiment 1 are represented by the same reference numerals.

[0072] Example 4, refer to Appendix Figures 11-15 ,as well as Figure 3 , 4 5.

[0073] This embodiment is an example of a self-locking, manually tightened drill chuck. Figures 11-15 In the figures, those with the same reference numerals as in Embodiment 1 have the same structure as in Embodiment 1.

[0074] The hand-tightening drill chuck with self-locking structure in this embodiment includes a rotating sleeve 1, a drill body 5, a nut 2, a jaw 6, a sliding component, and a washer 8. The sliding component uses a bearing 7. The nut 2 and the jaw 6 are threaded together. The rotating sleeve 1 is connected to the nut 2 through a keyway. The drill body 5 is provided with an inclined jaw hole 51. The jaw 6 passes through the jaw hole 51 and can slide back and forth along the jaw hole 51 under the drive of the nut 2.

[0075] The nut 2 is fitted onto the outside of the cylindrical body of the drill body 5 to center it. A nut support structure is provided behind the nut 2 on the drill body 5, and the bearing 7 is positioned between the nut 2 and the nut support structure. The nut support structure includes the washer 8, which is supported by a step 52 in the middle of the drill body; the washer 8 is anti-rotationally connected to the drill body and cannot rotate relative to it. The nut 2 is a one-piece nut, and the washer 8 has a jaw clearance hole 81.

[0076] like Figure 13As shown, the front end of the nut 2 is provided with four keys 21 for installing the spring plate 101 in the self-locking structure. The spring plate 101 is elastically inserted into the multiple keys 21 through its concave-convex configuration. The spring plate 101 includes a protrusion 102 and a locking end 103. The self-locking structure also includes a ring of teeth 53 on the drill body 2 that cooperate with the locking end 103 of the spring plate. The rotating sleeve 1 is provided with a groove 11 corresponding to the self-locking state. In the self-locking state, the spring plate 101 is connected through the protrusion 102 and the groove 11 on the rotating sleeve, and the locking end 103 of the spring plate is controlled by the cam structure 12 provided on it to cooperate with the teeth 53. The combination of the stop part and the rotating sleeve during operation can strongly maintain the self-locking state.

[0077] The bearing 7 includes a ring of steel balls 71 and a sheet-like plastic retainer 72 for the steel balls. The plastic retainer 72 has a ring of steel ball holes, and the steel balls 71 are disposed in the steel ball holes of the plastic retainer 72. In the bearing, the steel balls 71 protrude from the upper and lower surfaces. Figure 4 As shown, the steel ball retainer can also adopt a metal open-ring structure, such as including an inner ring 73 and an outer ring 74. The steel ball is clamped and positioned between the inner ring 73 and the outer ring 74. Both the inner ring 73 and the outer ring 74 are open-ring structures with openings 75, which can expand outward and retract.

[0078] The drill chuck has a fixed stop component 9 in the middle of the drill chuck. The stop component 9 has a stop claw 91, which is located between the outer side 720 of the steel ball plastic retainer and the rotating sleeve 1.

[0079] A steel ball pushing structure is formed between the nut 2 and the nut support structure. When the drill chuck is in the clamped state, the backward thrust of the nut pushes the steel balls outward. The steel ball plastic retainer 72 deforms outward due to the outward push of the steel balls 71, pushing the stop pawl 91 to engage with the rotating sleeve 1. When the drill chuck is not working, the stop pawl 91 and the steel ball plastic retainer 72 retract, and the stop pawl disengages from the rotating sleeve. In this embodiment, the rotating sleeve 1 includes a shell and a main rotating sleeve 10 made of engineering plastic, or it may also include inserts, sleeves, and other accessories fixedly connected to the main rotating sleeve.

[0080] The back thrust can come from the back thrust generated when the drill chuck is drilling, and the back thrust generated by the screw connection after tightening the nut to drive the jaws to move forward and clamp the drill bit.

[0081] The steel ball pushing structure includes a conical surface 20 on the outer side of the rear end face of the nut 2. An annular expansion opening is formed in the pushing structure. When the nut is subjected to the backward thrust generated by the drill chuck during drilling and the backward thrust generated by the screw connection after the nut is tightened and the jaws move forward to clamp the drill bit, the expansion opening can push the steel ball outward.

[0082] The outer surface of the stop pawl 91 and the rotating sleeve 1 are in a clearance fit under normal conditions (non-working state), and the clearance 90 is within the elastic deformation range of the stop pawl 91 and the steel ball plastic retainer 72. When the drill chuck is drilling, due to the back thrust, the steel ball 71 is squeezed outward, and the steel ball plastic retainer 72 is deformed to a certain extent outward due to the outward push of the steel ball 71, which pushes the stop pawl 91 to bend slightly outward and squeeze it tightly against the inner wall of the rotating sleeve 1. Since the stop component 9 is a fixed fastener that cannot rotate relative to the drill body 5, even if the bearing 7 rotates circumferentially, it does not affect the stopping effect of the stop component 9 on the rotating sleeve 1, which can resist inertia when the drill chuck stops suddenly and effectively resist vibration. During operation, the bonding force between the stop part and the rotating sleeve 1, that is, the frictional resistance, is greater than the elastic force of the spring plate 101, which can strongly maintain the self-locking state. When the drill chuck is not working, the steel ball 71 loses its outward pushing force. Utilizing the good elastic deformation recovery ability of the steel stop pawl 91, the steel ball plastic retainer 72 and the stop pawl 91 together use the potential energy generated after deformation to recover inward and retract until they are disengaged from the rotating sleeve 1, resulting in better recovery performance.

[0083] The stop component 9 includes a ring body 92, which is fitted over the drill body 5 and located behind the bearing 7. A fixing part 93 is provided on the ring body 92, preventing the stop component 9 from rotating relative to the drill body 5 through the anti-rotation connection between the fixing part 93 and the washer 8. Multiple forward-bent stop claws 91 are respectively provided on the ring body 92 along its circumference. The stop claws 91 are elastic, capable of swinging outward under the push of the steel ball plastic retainer 72, and returning inward when the pushing force is lost. When the stop claws 91 are engaged with the rotating sleeve 1, the stop claws 91 and the rotating sleeve 1 are tightly pressed together, thus keeping the rotating sleeve 1 constantly stopped and resisting the high inertia during sudden stops of the drill chuck.

[0084] Corresponding to the jaw clearance hole 81 of the washer, the ring body 92 is also provided with jaw clearance hole 93. The fixing part is the bent part 94 on both sides of the jaw clearance hole 93 of the ring body. The stop part 9 is made of steel and can be easily manufactured by stamping process. Moreover, the special structure of the washer 8 can be cleverly utilized to give it additional functions. The bent part 94 and the two side hole walls 82 of the jaw clearance hole 81 of the washer 8 form an anti-rotation fit, and the stop part 9 is fixed to the drill body 5 by the washer 8.

[0085] It should be noted that this invention does not propose a change to the structure of the self-locking structure itself, but rather provides a retaining and protecting structure for the self-locking structure. Therefore, those skilled in the art will understand that the mechanism of this invention for retaining and protecting the self-locking structure can be used in any hand-operated drill chuck with a self-locking structure.

[0086] Example 5, see attached document Figures 16-18 .

[0087] In this embodiment, an additional key 22 is added to the front end of the nut 2 based on that in embodiment 4. The spring plate 101 in the self-locking structure is installed through the five keys. The other parts in this embodiment are the same as those in embodiment 1.

[0088] exist Figures 16-18 In the figures, those with the same reference numerals as in Example 4 have the same structure as in Example 4.

[0089] Example 6, refer to Appendix Figure 19 .

[0090] This embodiment is a self-locking hand-tightening drill chuck embodiment. Its self-locking structure and spring plate installation are the same as in embodiment 4 or 5, while other structures are the same as in embodiment 2. Figures 11-15 In the figures, those with the same reference numerals as those in Examples 1, 2, 4, and 5 can be referred to in terms of their structure.

[0091] Example 7, see attached document Figure 20 , 21 Please refer to the accompanying drawings of Examples 1-6.

[0092] In this embodiment, the fixing method of the stop component 9 has been further improved, which can improve the performance of the fixing structure of the stop component 9 in resisting inertial or vibration impact and improve its service life.

[0093] The stop component 9 includes a ring body 92, which is fitted onto the drill body. Multiple forward-bent stop claws 91 are arranged circumferentially on the ring body 9 as stop portions. When engaged with the rotating sleeve, the stop claws 91 are tightly pressed against the rotating sleeve. The stop component has a fixing groove 95, and the washer 8 has a key 83 that can be inserted into the fixing groove of the stop component to fix the stop component circumferentially. The fixing groove 95 is the spacing between the stop claws 91, and the key 83 is a partial extension protrusion on the outer circumference of the washer plane. The ring body 92 is located behind the washer 8.

[0094] The front end of the stop claw 91 extends beyond the front end of the steel ball plastic retainer, and the front end of the stop claw has an inward protrusion 910 that covers the outer surface of the steel ball plastic retainer. This can improve the compression effect, the compression fit performance with the rotating sleeve, and the recovery performance. At the same time, it can also serve to install the stop component 9 and the bearing on the washer 8. The washer 8, the stop component 9, and the bearing can form an installation module.

[0095] Example 8, refer to Appendix Figures 22-26 .

[0096] This embodiment is an example of a self-locking, manually tightened drill chuck. Figures 22-26 In the figures, those with the same reference numerals as in Embodiment 1 have the same structure as in Embodiment 1.

[0097] The hand-tightening drill chuck with self-locking structure in this embodiment includes a rotating sleeve 1, a drill body 5, a nut 2, a jaw 6, a sliding aid component, and a washer 8. The sliding aid component is a bearing. The nut 2 and the jaw 6 are threaded together. The rotating sleeve 1 is connected to the nut 2 through a keyway. The drill body 5 is provided with an inclined jaw hole 51. The jaw 6 passes through the jaw hole 51 and can slide back and forth along the jaw hole 51 under the drive of the nut 2.

[0098] The nut 2 is fitted onto the outside of the cylindrical body of the drill body 5 to center it. A nut support structure is provided behind the nut 2 on the drill body 5, and the bearing is installed between the nut 2 and the nut support structure. The nut support structure includes the washer 8, which is supported by the step 52 in the middle of the drill body; the washer 8 is anti-rotationally connected to the drill body and cannot rotate relative to it. The nut 2 is a one-piece nut, and the washer 8 has a jaw clearance hole 81.

[0099] like Figure 25 , 26 As shown, the front end of the nut 2 is provided with five keys 21 for installing the spring plate 101 in the self-locking structure. The spring plate 101 is elastically inserted into the multiple keys 21 through its concave-convex configuration. The spring plate 101 includes a protrusion 102 and a locking end 103. The self-locking structure also includes a ring of teeth 53 on the drill body 2 that mates with the locking end 103 of the spring plate.

[0100] The rotating sleeve 2 is made of a metal shell, and the drill chuck is also equipped with a metal control ring 3. The metal control ring 3 and the rotating sleeve 2 are connected circumferentially by a keyway. Reference numeral 13 shows the key inside the rotating sleeve, which can be integrally formed with the metal shell during sheet metal manufacturing. Reference numeral 31 shows the groove on the outer cylinder of the metal control ring 3 that mates with the key 13. The front of the metal shell is provided with a flange 14, which can be integrally formed with the metal shell during sheet metal manufacturing. The key 13 is located at the end of the flange 14. The flange 14 mates with the front end face of the nut 2 to axially position the metal control ring 3, which rests on the front end face of the nut. At the front of the flange 14, an end cap 40, which is fixedly connected to the drill body 5, provides protection to prevent deformation.

[0101] The metal control ring 3 is provided with a control structure for the spring 101 and a groove 11 corresponding to the self-locking state. In the self-locking state, the spring 101 is connected to the groove 11 on the rotating sleeve via a protrusion 102, and the locking end 103 of the spring 101 is controlled by the cam structure 12 on the metal control ring 3 as a control mechanism to engage with the tooth 53. The engagement of the stop part and the rotating sleeve during operation can strongly maintain the self-locking state. The metal control ring 3 is also provided with a key 32 that engages with the key 21 on the nut 2 to further drive the nut to rotate forward after locking and to drive the nut to rotate in the reverse direction after unlocking. The above-mentioned structures on the metal control ring 3 can also be integrally formed by sheet metal. This provides an all-metal power drive and holding structure, improves the structural rigidity, and provides higher clamping force.

[0102] The bearing includes a ring of steel balls 71 and a plate-shaped plastic retainer 72 for the steel balls. The plastic retainer 72 has a ring of steel ball holes, and the steel balls 71 are disposed in the steel ball holes of the plastic retainer 72. In the bearing, the steel balls 71 protrude from the upper and lower surfaces. The bearing can also be made of... Figure 4 The structure shown.

[0103] The drill chuck has a fixed stop component 9 in the middle of the drill chuck. The stop component 9 has a stop claw 91, which is located between the outer side of the steel ball plastic retainer and the rotating sleeve 1.

[0104] A steel ball pushing structure is formed between the nut 2 and the nut support structure. When the drill chuck is in the clamping state, the steel ball is pushed outward by the backward thrust of the nut. The steel ball plastic retainer 72 deforms outward due to the outward pushing of the steel ball 71, which pushes the stop pawl 91 to engage with the rotating sleeve 1. When the drill chuck is not working, the stop pawl 91 and the steel ball plastic retainer 72 retract, and the stop pawl disengages from the rotating sleeve.

[0105] The back thrust can come from the back thrust generated when the drill chuck is drilling, and the back thrust generated by the screw connection after tightening the nut to drive the jaws to move forward and clamp the drill bit.

[0106] The steel ball pushing structure includes a conical surface 20 on the outer side of the rear end face of the nut 2. An annular expansion opening is formed in the pushing structure. When the nut is subjected to the backward thrust generated by the drill chuck during drilling and the backward thrust generated by the screw connection after the nut is tightened and the jaws move forward to clamp the drill bit, the expansion opening can push the steel ball outward.

[0107] The outer surface of the stop pawl 91 and the rotating sleeve 1 are in a clearance fit under normal conditions (non-working state), and this clearance is within the elastic deformation range of the stop pawl 91 and the steel ball plastic retainer 72. When the drill chuck is drilling, due to the back thrust, the steel ball 71 is squeezed outward, and the steel ball plastic retainer 72 is deformed to a certain extent outward due to the outward push of the steel ball 71, which pushes the stop pawl 91 to bend slightly outward and squeeze it tightly against the inner wall of the rotating sleeve 1. Since the stop component 9 is a fixed fastener that cannot rotate relative to the drill body 5, even if the bearing 7 rotates circumferentially, it does not affect the stopping effect of the stop component 9 on the rotating sleeve 1, which can resist inertia when the drill chuck stops suddenly and effectively resist vibration. During operation, the bonding force between the stop part and the rotating sleeve 1, that is, the frictional resistance, is greater than the elastic force of the spring plate 101, which can strongly maintain the self-locking state. When the drill chuck is not working, the steel ball 71 loses its outward pushing force. Utilizing the good elastic deformation recovery ability of the steel stop pawl 91, the steel ball plastic retainer 72 and the stop pawl 91 together use the potential energy generated after deformation to recover inward and retract until they are disengaged from the rotating sleeve 1, resulting in better recovery performance.

[0108] The stop component 9 includes a ring body 92, which is fitted over the drill body 5 and located behind the bearing 7. The anti-rotation connection structure between the ring body 92 and the washer 8 adopts the structure of embodiments 1 and 7. On the ring body 92, a plurality of forward-bent stop claws 91 are respectively arranged along its circumference. The stop claws 91 are elastic and can swing outward under the push of the steel ball plastic retainer 72, and return inward when the pushing force is lost. When the stop claws 91 are engaged with the rotating sleeve 1, the stop claws 91 and the rotating sleeve 1 are squeezed together, so the rotating sleeve 1 is always stopped to resist the high inertia when the drill chuck stops suddenly.

[0109] The above description is only a specific embodiment of the present invention, but the structural features of the present invention are not limited thereto. Any changes or modifications made by those skilled in the art within the scope of the present invention are covered by the protection scope of the present invention.

Claims

1. A hand-tightening drill chuck, comprising a rotating sleeve, a drill body, a nut, jaws, washers, a lubrication component, and a stop component; the nut and jaws are threadedly connected; the rotating sleeve and nut are directly or through a connecting structure; the drill body has an inclined jaw hole for the jaws to slide back and forth along the jaw hole; the nut is fitted over the outside of the drill body's cylindrical body; a nut support structure is provided behind the nut on the drill body; the nut support structure includes the washers; the washers are anti-rotationally connected to the drill body and cannot rotate relative to it; the lubrication component is provided between the nut and the washers; characterized in that: The sliding aid component includes a ring of steel balls; the drill chuck has a fixed stop component in the middle of the drill chuck, the stop component is connected to the anti-rotation washer and cannot rotate relative to the drill body, the stop component has a stop part, the stop part is located between the sliding aid component and the rotating sleeve; A steel ball pushing structure is formed between the nut and the nut support structure. When the drill chuck is in the clamped state, the steel ball is pushed outward by the backward thrust of the nut. The lubrication component pushes the stop part outward to engage with the rotating sleeve. When the drill chuck is in the unclamped state, the stop part retracts and disengages from the rotating sleeve.

2. The hand-operated drill chuck as described in claim 1, characterized in that... The stop component includes a ring body, which is fitted over the drill body and positioned behind the lubrication aid assembly. A fixing part is provided on the ring body, and the stop component is connected to the anti-rotation washer through the fixing part so that it cannot rotate relative to the drill body. On the ring body, a plurality of forward-bent stop claws are respectively provided along its circumference as stop parts. When the stop claws are engaged with the rotating sleeve, the stop claws and the rotating sleeve are squeezed together.

3. The hand-operated drill chuck as described in claim 2, characterized in that... The ring body is located between the washer and the lubrication aid component or behind the washer; the washer is supported by a step in the middle of the drill body.

4. The hand-operated drill chuck as described in claim 3, characterized in that... The nut is an integral nut; the washer is provided with a claw clearance hole; the ring body is also provided with a claw clearance hole; the fixing part is the bent part on both sides of the claw clearance hole of the ring body, and the bent part and the claw clearance hole of the washer form an anti-rotation fit.

5. The hand-operated drill chuck as described in claim 1, characterized in that... The stop component includes a ring body, which is fitted around the drill body and located behind the lubrication component. On the ring body, multiple forward-bent stop claws are respectively arranged along its circumference as stop parts. When the stop claws are engaged with the rotating sleeve, the stop claws and the rotating sleeve are squeezed together. The stop component is provided with a fixing groove, and the washer is provided with a key that can be inserted into the fixing groove of the stop component to fix the stop component.

6. The hand-operated drill chuck as described in claim 5, characterized in that... The fixing groove is the interval between the stop claws, the key is a partial extension protrusion on the outer circumference of the washer plane, and the ring body is located behind the washer.

7. The hand-operated drill chuck as described in claim 1, characterized in that... The steel ball pushing structure includes a conical surface around the outer side of the rear end face of the nut; the sliding aid component is also centered through the conical surface.

8. The hand-operated drill chuck as described in claim 1, characterized in that... The steel ball pushing structure includes a conical surface arranged on the outer side of the upper surface of the washer.

9. The hand-operated drill chuck as described in claim 2, characterized in that... The ring body is located between the washer and the lubrication component, and the steel ball pushing structure includes a conical surface disposed on the outer side of the upper surface of the ring body.

10. The hand-operated drill chuck as described in claim 1, characterized in that... The drill chuck is equipped with a self-locking structure, which includes a spring plate mounted on a nut and a ring of teeth on the drill body that engage with the locking end of the spring plate. The spring plate includes a protrusion and the locking end. In the self-locking state, the spring plate is connected to the groove on the rotating sleeve through the protrusion, and the locking end of the spring plate engages with the teeth through a cam structure controlled by the rotating sleeve. The stop part engages with the rotating sleeve to maintain the self-locking state.

11. The hand-operated drill chuck as described in claim 1, characterized in that... The rotating sleeve is made of a metal shell, and the drill chuck is also provided with a metal control ring. The metal control ring and the metal shell rotating sleeve are connected together in the circumferential direction by a keyway. The front part of the metal shell is provided with a folded edge, which cooperates with the front end face of the nut to axially position the metal control ring. The drill chuck is equipped with a self-locking structure, which includes a spring plate mounted on a nut and a ring of teeth on the drill body that engage with the locking end of the spring plate. The spring plate includes a protrusion and the locking end. The metal control ring is provided with a control structure and a groove for the spring plate. In the self-locking state, the spring plate is connected to the groove on the rotating sleeve through the protrusion, and the rotating sleeve controls the locking end of the spring plate to engage with the teeth through the control structure. The stop part engages with the rotating sleeve to maintain the self-locking state.

12. The hand-operated drill chuck as described in claims 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, or 11, characterized in that... The lubrication aid assembly includes a ring of steel balls and a deformable steel ball retainer. The steel balls are disposed in the steel ball holes of the steel ball retainer, and the steel balls protrude from the upper and lower surfaces of the lubrication aid assembly. The stop part is located between the steel ball retainer and the rotating sleeve. The steel ball retainer expands and deforms outward due to the outward pushing of the steel balls, pushing the stop part outward to engage with the rotating sleeve. When the drill chuck is in the open jaw state, the stop part and the steel ball plastic retainer retract, and the stop part disengages from the rotating sleeve.

13. The hand-operated drill chuck as described in claim 12, characterized in that... The front end of the stop portion extends beyond the front end of the ball retainer, and the front end of the stop portion has an inward protrusion that covers the outer surface of the ball retainer.

14. The hand-operated drill chuck as described in claim 12, characterized in that... The ball retainer has a closed-loop or open-loop structure, and the inner diameter of the ball retainer is larger than the diameter of the drill body; the lubrication aid is placed on the washer or on the stop component.

15. The hand-operated drill chuck as described in claims 2, 3, 4, 5, 6, 7, 8, 9, 10, or 11, characterized in that... The sliding aid component includes a ring of steel balls; the ring of steel balls is placed on a washer or on the stop component; the stop part is located between the ring of steel balls and the rotating sleeve, and the distance between the stop claws is smaller than the diameter of the steel balls.

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