Hand-tight drill chuck

Abstract

The utility model provides a hand-tight drill chuck, which comprises a rotary sleeve, a drill body, a nut, a clamping jaw and a gasket, the nut is in threaded connection with the clamping jaw, the rotary sleeve and the nut are connected directly or through a connecting structure and are limited in the axial direction, and the drill body is provided with an inclined clamping jaw hole for the clamping jaw to slide back and forth along the clamping jaw hole. The nut is sleeved outside a cylinder of the drill body, the drill body is provided with a supporting step, and the gasket is placed on the supporting step. According to the utility model, a circle of steel balls are directly kept through the flanged gasket with the arched bottom, and the flanged gasket with the structure can provide axial jacking force and play a role in preventing a nut from loosening when the drill chuck is used for punching, and also can be used as a self-locking state keeping and protecting mechanism for the self-locking drill chuck; meanwhile, a plastic retainer can be avoided, so that the service life of the drill chuck with the anti-loosening function is prolonged; furthermore, the anti-loosening device can be combined with a rotating sleeve to prevent the rotating sleeve from loosening, and the anti-loosening effect is improved.

Description

Technical Field

[0001] The utility model relates to a drill chuck, in particular to a hand-tightening drill chuck, which is a drill chuck that does not require a wrench for operation. Background Art

[0002] A drill body, a clamping jaw, and a nut are provided in the drill chuck. The nut is threadedly connected to the clamping jaw. A rotating sleeve is provided in the hand-tightening drill chuck. The rotating sleeve is directly or indirectly connected to the nut through a connecting structure. By manually operating the rotating sleeve, the nut is rotated to drive the clamping jaw to move forward or backward, so that the clamping jaw clamps or loosens the drill bit. The nut is placed on a step in the middle of the drill body through a bearing ring and a gasket. The bearing ring is composed of a plastic cage and a ring of steel balls embedded in the plastic cage.

[0003] With the development of lithium battery technology, the rotational speed of electric drills is getting faster and faster. When drilling, when the electric drill stops suddenly from a high rotational speed, inertia will be generated instantaneously. The drill chuck will become loose due to the sudden stop of the electric drill. Specifically, the nut will rotate in the direction of opening the clamping jaw of the drill chuck due to inertia, resulting in the loosening of the drill bit or the failure of the locking state of the drill chuck. When the drill chuck is applied to an electric wrench, due to the large reverse impact it bears, the drill chuck is also prone to self-loosening.

[0004] In addition, during the drilling impact operation, due to the large vibration of the electric drill, the nut is likely to rotate in the opening direction, resulting in the dropping of the drill tool clamped by the clamping jaw and the inability to be used normally.

[0005] Currently, the method to solve the problem of self-loosening of the drill chuck caused by inertia, reverse impact or vibration during the operation of the drill chuck is to set an anti-loosening structure on the drill chuck. However, in many anti-loosening implementation methods, since the steel balls play a key role in applying force, during use, the plastic cage of the bearing is prone to wear, deformation, or even rupture, resulting in the failure of the drill chuck. Summary of the Utility Model

[0006] The technical problem to be solved by the utility model is to provide a hand-tightening drill chuck that can not only play a role in resisting inertia and preventing loosening during work, but also can improve the service life. To this end, the utility model adopts the following technical solutions:

[0007] A hand-tightening drill chuck includes a rotating sleeve, a drill body, a nut, a clamping jaw, and a washer. The nut is threadedly connected to the clamping jaw. The rotating sleeve is directly or indirectly connected to the nut through a connecting structure and the rotating sleeve and the nut are axially limited. The drill body is provided with an inclined clamping jaw hole for the clamping jaw to slide back and forth along the clamping jaw hole. The nut is sleeved on the outer part of the column of the drill body. The drill body is provided with a support step, and the washer is placed on the support step. The characteristics are as follows:

[0008] The washer is a flanged washer, and its bottom arches forward. When axially compressed, it can undergo elastic deformation to provide a forward tightening force. The nut is placed in front of the flanged washer through a sliding assistance structure adapted to the forward-arched part of the bottom of the flanged washer. The sliding assistance structure is directly placed in the flanged washer and above the forward-arched part. During the drilling operation of the drill chuck, the nut is tightened by squeezing the forward-arched part through the sliding assistance structure adapted to the forward-arched part.

[0009] On the basis of adopting the above technical solution, the present utility model can also adopt the following further technical solutions, or use these further technical solutions in combination:

[0010] The rear end of the nut is inserted into the flanged washer, and a circular arc protrusion is provided at the rear end of the nut as a sliding assistance structure adapted to the forward-arched part to interact with the forward-arched part.

[0011] The sliding assistance structure adopts a ring of steel balls directly placed in the flanged washer without using a plastic cage. The steel balls are arranged in a circumferential pattern, and the diameter D of the circle formed by the centers of the balls is more than 0.6 mm larger than the diameter d of the support step of the drill body.

[0012] A circular positioning groove is provided on the outer side of the rear end of the nut. Through the positioning groove, the ring of steel balls is positioned above the forward-arched part and the forward tightening force is concentrated.

[0013] The flange of the flanged washer is provided with a slit or notch so that it can also undergo radial elastic deformation when being squeezed, and when radially expanding outward, it can be combined with the inner wall of the rotating sleeve or combined with the structure fixedly connected to the rotating sleeve.

[0014] The forward-arched part is adjacent to the radial inner side of the bend of the flange of the flanged washer, so that the angle between the forward-arched part and the flange is greater than 100°. The flanged washer sequentially includes a flange, a flange bend, a forward-arched part, and a support part cooperating with the support step from outside to inside.

[0015] The flanged washer sequentially includes a flange, a flange bend, a forward-arched part, and a support part cooperating with the support step from outside to inside. The diameter D1 of the circle formed by the center of the bend angle of the flange bend is more than 0.6 mm larger than the diameter d of the support step of the drill body.

[0016] The nut is an integral nut. The drill body is not provided with a nut installation groove. The drill chuck includes a nut limiting sleeve. The nut limiting sleeve includes a clamping part connected to the drill body at the front and a retaining ring cooperating with the front end of the nut at the rear.

[0017] The clamping part includes a ring of clamping pieces provided at the front end of the retaining ring.

[0018] Due to the adoption of the technical solution of the present utility model, the present utility model directly holds a circle of steel balls through a washer with a flanging and an arched bottom. The flanging washer with this structure can axially elastically deform to provide an axial tightening force during the drilling operation of the drill chuck, playing a role in preventing loosening of the nut. When the drill chuck encounters an emergency stop during the drilling operation, it can maintain the original clamping state. At the same time, for a self-locking drill chuck, it can also serve as a mechanism for maintaining and protecting the self-locking state; meanwhile, the use of a plastic cage can be avoided, thereby increasing the service life of the drill chuck with a function of preventing loosening; and further, the above structure can also provide a radial elastic deformation function, and when the drill chuck drills a hole, it can cooperate with the rotating sleeve to prevent the rotating sleeve from loosening, improving the anti-loosening effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a cross-sectional view of Embodiment 1 of the present utility model.

[0020] Figure 2 It is an exploded view of Embodiment 1 of the present utility model.

[0021] Figure 3 It is a schematic view of the nut of Embodiment 1 of the present utility model.

[0022] Figure 4 It is a cross-sectional view of the nut of Embodiment 1 of the present utility model.

[0023] Figure 5 It is a schematic view of the nut limit sleeve of Embodiment 1 of the present utility model.

[0024] Figure 6 It is a schematic view of an implementation manner of the flanging washer of the present utility model.

[0025] Figure 7 For the flanging washer of the present utility model Figure 6 The cross-sectional view of the shown implementation manner.

[0026] Figure 8 It is a cross-sectional view of another implementation manner of the flanging washer of the present utility model.

[0027] Figure 9 It is a cross-sectional view of Embodiment 2 of the present utility model.

[0028] Figure 10 It is a cross-sectional view of the nut of Embodiment 2 of the present utility model.

[0029] Figure 11 It is an exploded view of Embodiment 3 of the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0030] Embodiment 1, referring to the attached Figures 1-8 .

[0031] The hand-tight drill chuck provided by the utility model comprises a rotating sleeve 1, a drill body 5, a nut 2, a jaw 6 and a washer 8. The nut 2 is in threaded connection with the jaw 6. The rotating sleeve 1 is connected with the nut 2 through keyway fit and the rotating sleeve and the nut are axially limited. 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.

[0032] The nut 2 is sleeved outside the cylinder of the drill body 5 to center. The drill body 5 is provided with a supporting step 52 behind the nut 2. The washer 8 is placed on the supporting step 52.

[0033] The washer 8 is a flanged washer, and its bottom arches forward. When axially extruded, it can produce elastic deformation to provide a forward pressing force. The nut 2 is placed in front of the flanged washer through a sliding-assisting structure adapted to the forward-arching part 81 at the bottom of the flanged washer. The sliding-assisting structure is directly placed in the flanged washer and located above the forward-arching part. During the drilling operation of the drill chuck, the resistance received by the nut is transmitted to the flanged washer through the sliding-assisting structure, and the forward-arching part is extruded through the sliding-assisting structure to make its elastic deformation press tightly against the nut 2.

[0034] The rear end of the nut 2 is inserted into the flanged washer. A circular arc protrusion 21 is provided at the rear end of the nut 2 as a sliding-assisting structure adapted to the forward-arching part 81 to interact with the forward-arching part.

[0035] In the washer 8, the flanged washer sequentially comprises a flange 83, a flange bend 82, a forward-arching part 81 and a supporting part 84 cooperating with the supporting step 52 from outside to inside. The forward-arching part 81 is connected to the radial outside of the supporting part 84 and the radial inside of the flange bend 82. The radial outside of the supporting part 84 inclines forward. The diameter D1 of the circle formed by the center H of the bend angle of the flange bend 82 is more than 0.6 mm larger than the diameter d of the drill body supporting step 52.

[0036] As another preferred embodiment of the flanged washer, a slit 85 is provided on the flange 83 of the flanged washer so that it can also radially elastically deform when being extruded, and when radially expanding outwards, it can be combined with the inner wall of the rotating sleeve or combined with a structure fixedly connected to the rotating sleeve, so that the rotating sleeve 1 does not loosen, preventing its loosening from another aspect of the nut 2.

[0037] In this embodiment, the nut 2 is an integral nut, which can reduce the diameter of the drill body 5 and help reduce inertia. The drill body 5 is not provided with a nut mounting groove. The drill chuck includes a nut limiting sleeve 3, and the nut limiting sleeve 3 includes a clamping part connected to the drill body at the front and a retaining ring 31 cooperating with the front end of the nut at the rear. The clamping part includes a circle of clips 32 arranged at the front end of the retaining ring 31. The axial limit of the rotating sleeve 1 can be limited by the decorative cap 4 fixedly connected to the drill body 5 at the front end and the front end of the nut limiting sleeve 3 or the rear sleeve or the rear cover 7 fixedly connected to the drill body 5 at the rear end.

[0038] Embodiment 2, refer to the appendix Figures 9-10 , and also refer to Figures 1-8 .

[0039] In this embodiment, the anti-slip structure adopts a circle of steel balls 9 directly placed in the flanged washer without using a plastic cage. The steel balls 9 are arranged in a circumferential pattern, and the diameter D of the circle formed by the centers of the balls is more than 0.6 mm larger than the diameter d of the drill body support step 52. Further, a circle of positioning grooves 22 is provided on the outer side of the rear end of the nut 2, and the circle of steel balls 9 is positioned above the forward-arching part 81 through the positioning grooves 22, and the forward-tightening force is converged.

[0040] Other parts of this embodiment are the same as those of Embodiment 1. In Figures 9-10 , the reference numerals in the appendix are the same as those in Figures 1-8 , representing the same meaning.

[0041] Embodiment 3, refer to the appendix Figure 11 , and also refer to Figures 1-8

[0042] In this embodiment, the nut 2a is composed of two half-bodies connected and combined through a nut sleeve or directly connected and combined with the inner wall of the rotating sleeve by interference fit. The axial limit of the nut 2a is based on the groove wall of the nut mounting groove 53 on the drill body 5.

[0043] Other parts of this embodiment are the same as those of Embodiment 1. In Figure 11 , the reference numerals in the appendix are the same as those in Figures 1-8 , representing the same meaning.

[0044] The above are only specific embodiments 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.

[0045] It should be noted that the terms "comprising", "having" and any variations thereof in the description, claims and above-mentioned drawings of the present utility model are intended to cover non-exclusive inclusion. The terms "installed", "arranged", "provided with", "connected", "coupled" and "socketed" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral structure; it may be a mechanical connection or an electrical connection; it may be directly connected, or indirectly connected through an intermediate medium, or there may be internal communication between two devices, components or parts. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0046] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "one end", "the other end", "outer side", "inner side", "horizontal", "end", "length", "outer end", "left", "right", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present utility model. The terms "first" and "second" are also used only for the sake of brevity in description, and do not indicate or imply relative importance.

Claims

1. A hand-tight drill chuck, comprising a rotating sleeve (1), a drill body (5), a nut (2), a clamping jaw (6), and a washer (8), wherein the nut (2) and the clamping jaw (6) are threadedly connected, the rotating sleeve (1) and the nut (2) are connected directly or through a connecting structure, and the rotating sleeve (1) and the nut (2) are limited in the axial direction, the drill body (5) is provided with an inclined clamping jaw hole (51) so that the clamping jaw (6) can slide forward and backward along the clamping jaw hole (51), the nut (2) is sleeved on the outside of the column of the drill body (5), the drill body (5) is provided with a supporting step (52), and the washer is placed on the supporting step (52); characterized in that: The washer (8) is a flanged washer, and its bottom is arched forward. When subjected to axial compression, it can generate elastic deformation to provide a forward tightening force. The nut (2) is placed in front of the flanged washer through a sliding structure that matches the forward arched portion (81) of the bottom of the flanged washer. The sliding structure is directly placed in the flanged washer and located above the forward arched portion (81). When the drill chuck is drilling, the forward arched portion (81) is squeezed by the sliding structure that matches the forward arched portion (81) to tighten the nut (2).

2. A hand-tight drill chuck as claimed in claim 1, characterized in that The rear end of the nut (2) is inserted into the flanged washer, and a circle of arc-shaped protrusions (21) are provided at the rear end of the nut (2) as a sliding-assisting structure adapted to the forward-arched portion (81) and interacting with the forward-arched portion (81).

3. A hand-tight drill chuck as claimed in claim 1, characterized in that The sliding aid structure uses a circle of steel balls (9) directly placed in the flanged gasket without using a plastic retainer. The steel balls (9) are arranged in a circle, and the diameter D of the circle formed by the ball centers is greater than the diameter d of the support step (52) of the drill body (5) by more than 0.6 mm.

4. A hand-tight drill chuck as claimed in claim 3, characterized in that A circle of positioning grooves (22) is provided on the outer side of the rear end of the nut (2), and the circle of steel balls (9) are positioned through the positioning grooves (22), located above the forward arched portion (81), and gather the forward tightening force.

5. A hand-tight drill chuck as claimed in claim 1, 2, 3 or 4, characterized in that The flanged edge of the flanged gasket is provided with a slit (85) or a notch so that it can also elastically deform radially when subjected to the extrusion, and can be combined with the inner wall of the rotating sleeve or with a structure fixedly connected to the rotating sleeve when expanding radially outward.

6. A hand-tight drill chuck as claimed in claim 1, 2, 3 or 4, characterized in that The flanged gasket comprises, from outside to inside, a flange (83), a flange bend (82), a forwardly arched portion (81) and a support portion (84) cooperating with the support step (52); the forwardly arched portion (81) is connected to the radial outer side of the support portion (84) and the radial inner side of the flange bend (82); and the radial outer side of the support portion (84) is inclined forward.

7. A hand-tight drill chuck as claimed in claim 6, characterized in that The flanged gasket comprises, from the outside to the inside, a flange (83), a flanged bend (82), a forwardly arched portion (81) and a support portion (84) cooperating with the support step (52); the diameter D1 of a circle formed by the center of the bend of the flanged bend (82) is greater than the diameter d of the support step (52) of the drill body (5) by more than 0.6 mm.

8. A hand-tight drill chuck as claimed in claim 1, 2, 3 or 4, characterized in that The nut (2) is an integral nut, the drill body (5) is not provided with a nut mounting groove, and the drill chuck comprises a nut limiting sleeve (3), the nut limiting sleeve (3) comprising a clamping portion at the front connected to the drill body and a pressure ring (31) at the rear cooperating with the front end of the nut.

9. A hand-tight drill chuck as claimed in claim 8, characterized in that The clamping portion comprises a circle of clamping pieces (32) arranged at the front end of the pressing ring (31).

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