Locking drill chuck

Abstract

The utility model provides a locking drill chuck which is provided with a locking structure. Comprising a locking piece and an inner gear ring, the locking piece is connected with a nut, the locking piece and the nut synchronously rotate around the central axis of a drill body, the locking piece is provided with an elastic piece, the elastic piece is provided with an outwards-warped locking end, the inner gear ring comprises a ring-shaped base body, and the ring-shaped base body is provided with an inner gear piece which can elastically deform towards the radial outer side to be in extrusion fit with a rotating sleeve. An inner ratchet facing the radial inner side is arranged on the inner tooth piece, and the drill chuck is provided with an extrusion knot hook between the nut and the step, so that when the drill chuck rotates, the inner tooth piece is extruded to elastically deform and expand towards the radial outer side and is tightly extruded with the inner wall of the rotating sleeve. The rotary sleeve drives the nut to extrude the inner gear ring backwards and outwards, so that the inner tooth pieces on the inner gear ring are opened outwards and tightly extruded with the inner wall of the rotary sleeve, the whole nut is axially limited through the clamping ring to prevent the nut from loosening, the locking effect and performance of the locking structure are guaranteed, and it is guaranteed that the drill chuck cannot be locked ineffectively.

Description

Technical Field

[0001] The utility model relates to a drill chuck, in particular to a locking drill chuck. Background Art

[0002] The locking drill chuck is provided with a drill body, a clamping jaw, a nut, and a rotating sleeve. The nut and the clamping jaw are threadedly connected, and the rotating sleeve and the nut are connected directly or through a connecting structure. The rotating sleeve is operated by hand, and the nut is rotated to drive the clamping jaw to move forward or backward to clamp or loosen the drill bit. Some drill chucks are also provided with a locking structure, which generally includes a gear ring fixed to the surface of the drill body and a spring plate connected to the nut. The spring plate is located radially outside the gear ring and enters a locked state under the control of the rotating sleeve.

[0003] With the development of lithium battery technology, the speed of electric drills is getting faster and faster. When drilling, the electric drill will generate inertia instantly when it stops from high speed. The drill chuck will loosen due to the emergency stop of the electric drill. The rotating sleeve will unlock due to inertia, causing the nut to rotate in the direction of opening the drill chuck jaws due to inertia, causing the drill bit to loosen. Even if a locking structure is set, the locking state of the drill chuck may fail under the current lithium battery technology. Utility Model Content

[0004] The purpose of the utility model is to provide a locking drill chuck with enhanced locking force during operation, thereby improving the anti-inertia self-loosening unlocking performance of the locking drill chuck. To this end, the utility model adopts the following technical solutions:

[0005] A locking drill chuck is provided with a drill body, a clamping jaw, a nut, and a rotating sleeve. The nut and the clamping jaw are threadedly connected. The rotating sleeve is connected to the nut through a connecting structure and can drive the nut to rotate. The nut is sleeved outside the drill body and supported on a step in the middle of the drill body. The locking drill chuck is provided with a locking structure; the locking structure is characterized in that the locking structure includes a locking piece and a positioned inner gear ring, the locking piece is connected to the nut and rotates synchronously with the nut around the central axis of the drill body, the locking piece is provided with a spring sheet, the spring sheet has a locking end that is tilted outward, and the inner gear ring includes a first ring-shaped base The drill chuck is provided with an extrusion hook between the nut and the step, so that the reverse thrust during the rotation of the drill chuck causes the nut to move backward, the inner gear ring bends backward and radially outward, pushes and squeezes the inner gear piece to elastically deform and open radially outward, and is tightly pressed against the inner wall of the rotating sleeve.

[0006] On the basis of adopting the above technical solutions, the present invention can also adopt the following further technical solutions, or use these further technical solutions in combination:

[0007] The nut is an integral nut, the drill chuck is provided with a retaining ring, the retaining ring is arranged at the front end of the nut, the retaining ring includes an integral and continuous pressure ring body and a plurality of elastic cards located around the inner hole of the pressure ring body, and an annular groove cooperating with the elastic card is arranged on the drill body.

[0008] A circle of inner gear pieces is arranged on the first ring-shaped base of the inner gear ring, and a plurality of gaps are arranged in the circle of inner gear pieces so that the inner gear pieces have elasticity and can undergo the elastic deformation.

[0009] The first ring-shaped base of the inner gear ring is placed on the step, and the first ring-shaped base of the inner gear ring has a radially outer suspended portion, and the inner tooth piece is bent and arranged at the outer edge of the suspended portion.

[0010] There is a ring-shaped bearing steel ball cavity between the inner gear ring and the nut, in which a bearing steel ball is arranged. The bearing steel ball cavity has an action surface facing backward and radially outward, and during operation, the bearing steel ball is squeezed radially outward and the inner gear plate is elastically deformed radially outward.

[0011] The locking element includes a second annular base, which is located between the first annular base of the inner gear ring and the rear end of the nut. The second annular base of the locking element and the inner gear ring together form the annular bearing steel ball cavity, and the second annular base of the locking element is provided with the rearward and radially outward acting surfaces.

[0012] The inner gear ring forms a circumferential fit with the drill body to prevent relative rotation through the radially inward protrusion of the inner hole wall of the first ring-shaped base body.

[0013] The drill body is provided with a plurality of arc grooves by axially drilling holes at its edge. The first ring-shaped base body of the inner gear ring is a sheet-shaped ring body, and an arc protrusion matching with the arc grooves is formed around its inner hole.

[0014] The locking element comprises a second ring-shaped base, on which a plurality of locking structures are arranged, each locking structure comprising the spring sheet and an outward control protrusion connected to the spring sheet, the end of the spring sheet being the outwardly tilted locking end, the inner wall of the rotating sleeve being provided with a cam surface for controlling and cooperating with the outward control protrusion, the locking element being further provided with an outward connecting protrusion integral with the locking element, and the rotating sleeve being provided with a connecting groove for cooperating with the outward connecting protrusion.

[0015] The outer side surface of the inner tooth plate is provided with an outer ratchet tooth which is opposite to the ratchet tooth of the inner gear ring, and the inner wall of the rotating sleeve is provided with a second inner ratchet tooth which can mesh with the outer ratchet tooth.

[0016] Due to the technical solution of the utility model, under the combined effect of the centrifugal force generated by high-speed rotation and the reaction force received by the drill chuck during the drilling process, the utility model can squeeze the inner gear ring backward and outward through the rotating sleeve driving nut, so that the inner teeth on the inner gear ring open outward and squeeze against the inner wall of the rotating sleeve, thereby ensuring the locking effect and performance of the locking structure and ensuring that the drill chuck will not fail to lock. Furthermore, the axial position of the integral nut is limited by the clamping ring of the utility model to prevent the nut from loosening, further ensuring the locking effect and performance of the locking structure and ensuring that the drill chuck will not fail to lock. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a structural explosion diagram of Example 1 of the utility model.

[0018] Figure 2 This is a cross-sectional view of Example 1 of the utility model before entering the locked state.

[0019] Figure 3 , Figure 4 They are respectively a bottom view and a stereoscopic view of the inner gear ring of Example 1 of the utility model.

[0020] Figure 5 Schematic diagram of the drill body in Examples 1 and 2 of the present invention.

[0021] Figure 6 This is a schematic diagram of the combination of the inner gear ring and the lock ring in Example 1 of the utility model.

[0022] Figure 7 It is a cross-sectional view of embodiment 1 of the utility model in a locked state.

[0023] Figure 8 It is a schematic diagram of the clamping ring in Examples 1 and 2 of the utility model.

[0024] Fig. 9 This is a cross-sectional view of Example 2 of the utility model, that is, Fig.12 AA section view.

[0025] Fig.10 , Fig.11 They are respectively a bottom view and a stereoscopic view of the inner gear ring of Example 2 of the utility model.

[0026] Fig.12 It is a cross-sectional view of embodiment 2 of the utility model in a locked state.

[0027] Fig.13 This is a schematic diagram of the combination of the inner gear ring and the locking element of Example 2 of the utility model. DETAILED DESCRIPTION

[0028] See attached Figure 1-Figure 8The utility model provides a locking drill chuck, which is provided with a drill body 1, a clamping jaw 2, a nut 3, a rotating sleeve, and a clamping ring 8. The nut 3 and the clamping jaw 2 are threadedly connected. The rotating sleeve includes an outer sleeve 41 and a bushing 42 fixed to the outer sleeve 41 and arranged in a setting configuration. The bushing 42 in the rotating sleeve is connected to the nut 3 through a connecting structure and can drive the nut 3 to rotate. The nut 3 is sleeved outside the drill body 1 and supported on a step 11 in the middle of the drill body.

[0029] The locking drill chuck is provided with a locking structure, which includes a locking member 5 and a positioned inner gear ring 6. The locking member 5 is connected to the nut 3 and rotates synchronously with the nut 3 around the central axis of the drill body 1. The locking member 5 is provided with a spring 51, and the spring 51 has a locking end 52 that is tilted outward. The inner gear ring 6 includes a first ring-shaped base 60, and the first ring-shaped base 60 is provided with an inner tooth piece 61 that can be elastically deformed radially outward and pressed and matched with the rotating sleeve, and the inner tooth piece 61 is provided with an inner ratchet facing radially inward. 611, the inner ratchet 611 cooperates with the locking end 52, the bushing 42 in the rotating sleeve 41-42 is provided with a structure for controlling the locking end 52, so that the locking end 52 leaves the inner ratchet 611 or is inserted into the inner ratchet 611, the drill chuck is provided with an extrusion hook between the nut 3 and the step 11, the reverse thrust causes the nut 3 to move backward, the inner gear ring 6 bends backward and radially outward (obliquely backward and outward), and pushes and squeezes the inner tooth piece 61 to elastically deform and open radially outward, and is tightly pressed against the inner wall of the rotating sleeve ( Figure 7 Because the two are in a squeezed state, Figure 2 When the nut 3 and the rotating sleeve 42 are not in the working state, the inner tooth piece 61 rebounds and the two are disengaged, thereby being constrained to enhance the overall locking force of the drill chuck and prevent the nut 3 and the rotating sleeve 42 from loosening by themselves.

[0030] A transfer groove 31 may be provided on the nut 3, and the groove walls 32 on both sides of the transfer groove may cooperate with the keys on the inner wall of the rotating sleeve (the bushing 42 in the rotating sleeve in this embodiment), so that the rotating sleeve 42 and the nut 3 are connected during the tightening process in the locked state and the loosening process after unlocking.

[0031] Regarding the inner gear ring 6 , a circle of inner gear pieces 61 is disposed on the first ring-shaped base body 60 , and gaps 62 are disposed in the inner gear pieces 61 so that the inner gear pieces 61 have elasticity and can undergo the elastic deformation.

[0032] The first ring-shaped base 60 of the inner gear ring 6 is placed on the step 11, and the inner gear ring 6 is pressed on the drill body 1 by the parts in front of it and is axially positioned, and the first ring-shaped base 60 of the inner gear ring 6 has a radially outer hollow portion 63, and the inner tooth piece 61 is bent and arranged at the outer edge of the hollow portion 63, which can reduce the diameter of the drill body 1 and increase the elastic deformation effect.

[0033] The locking member 5 includes a second annular base 50, which is located between the first annular base 60 of the inner gear ring 6 and the rear end of the nut 3. The second annular base 50 of the locking member 5 and the inner gear ring 6 together form an annular bearing steel ball cavity, in which a bearing steel ball 7 is arranged. The second annular base 50 has an action surface 501 facing backward and radially outward, and when working, the bearing steel ball 7 is squeezed radially outward and the inner gear plate 61 is elastically deformed radially outward.

[0034] The inner gear ring 6 is positioned so as not to rotate relative to the drill body 1. A plurality of arc grooves 12 are formed on the drill body 1 by axially punching holes at its edge. The first ring-shaped base 60 of the inner gear ring 6 is a sheet-shaped ring body, and during punching and manufacturing, an arc protrusion 65 is formed around the inner hole to cooperate with the arc groove 12 to form a circumferential cooperation to prevent relative rotation. Whether manufacturing the groove 12 or manufacturing and installing the inner gear ring 6, it is very convenient.

[0035] For the lock 5, multiple groups of lock structures are arranged on its second ring-shaped base 50, each group of structures includes the spring sheet 51 and the outward control protrusion 53 connected to the spring sheet 51, the end of the spring sheet 51 is the lock end 52 that tilts outward (that is, in the direction away from the center of the circle), and the inner wall of the rotating sleeve (the bushing 42 in the rotating sleeve in this embodiment) is provided with a cam surface that controls and cooperates with the outward control protrusion 53, so that the lock end 52 leaves the inner ratchet 611 or inserts into the inner ratchet 611. The lock 5 is also provided with an outward connection protrusion 54 that is integrated with the lock sheet, and the rotating sleeve (the bushing 42 in the rotating sleeve in this embodiment) is provided with a connection groove that cooperates with the outward connection protrusion. The connection between the lock 5 and the nut 3 can be achieved by using the key 55 on the lock 5 to cooperate with the groove 33 on the nut 3.

[0036] The nut 3 is an integral nut, and the collar 8 is arranged at the front end of the nut 3. The collar 8 includes an integral and continuous pressure ring body 81 and a plurality of elastic clips 82 located in a circle around the inner hole of the pressure ring body 81. The drill body 1 is provided with an annular groove 13 that cooperates with the elastic clips. The collar 8 includes a pressure ring body to axially limit the nut 3. For the structure using an integral nut, the axial limit of the nut usually adopts a connection method of interference fit between the rotating sleeve and the nut, which usually causes the nut to loosen in a high impact and vibration environment, resulting in the loss of claws and overall functional failure. The use of the collar 8 structure of the utility model is not only convenient for assembly but also reliable for the axial limit of the integral nut, preventing the nut 3 from loosening and ensuring high output of the backward extrusion force, and ensuring the combination performance of the inner tooth piece 61 and the spring piece 51.

[0037] Reference Figure 5 , Figure 8-Figure 13 , please also refer to Figure 1In this embodiment, the same reference numerals as those in the previous embodiment represent the same meanings. In this embodiment, the outer side surface of the inner tooth plate 61 is provided with outer ratchet teeth 64 in the opposite direction to the inner ratchet teeth 611 of the inner gear ring 6, and the inner wall of the rotating sleeve (the sleeve 42 of the rotating sleeve in this embodiment) is provided with second inner ratchet teeth 43 that can mesh with the outer ratchet teeth 64 of the inner tooth plate 61. With this embodiment, when the drill chuck rotates, the rotating sleeve can be further combined into the meshing system, so that the self-locking effect is better and the spring sheet 51 can be protected. The other parts and other structures of this embodiment are also the same as those of the first embodiment.

[0038] 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 any technician in the field of the present invention are included in the protection scope of the present invention.

[0039] It should be noted that the terms "including" and "having" and any variations thereof in the specification and claims of the utility model and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "installed", "set", "provided with", "connected", "connected", and "socketed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be an internal connection between two devices, elements or components. For those of ordinary skill in the art, the specific meanings of the above terms in the utility model can be understood according to the specific circumstances.

[0040] In the description of the present invention, it should be understood that the terms "one end", "the other end", "outside", "inside", "horizontal", "end", "length", "outer end", "left", "right" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation on the present invention. The terms "first" and "second" are also used only for the simplicity of description, and do not indicate or imply relative importance.

Claims

1. A locking drill chuck, comprising a drill body (1), a clamping jaw (2), a nut (3), and a rotating sleeve, wherein the nut (3) and the clamping jaw (2) are threadedly connected, the rotating sleeve is connected to the nut (3) via a connecting structure and can drive the nut (3) to rotate, the nut is sleeved outside the drill body (1) and supported on a step in the middle of the drill body, and the locking drill chuck is provided with a locking structure; Features: The locking structure comprises a locking element (5) and a positioned inner gear ring (6); the locking element (5) is connected to the nut (3) and rotates synchronously with the nut (3) around the central axis of the drill body (1); the locking element (5) is provided with a spring sheet (51); the spring sheet (51) has a locking end (52) that is tilted outward; the inner gear ring (6) comprises a first ring-shaped base (60); the first ring-shaped base (60) is provided with an inner gear sheet (61) that can elastically deform radially outward to be pressed and matched with the rotating sleeve; the inner gear sheet An inner ratchet (61) facing radially inward is provided on the drill chuck (61), the inner ratchet (611) cooperates with the locking end (52), the rotating sleeve is provided with a structure for controlling the locking end (52), and the drill chuck is provided with an extrusion hook between the nut (3) and the step, so that during the rotation of the drill chuck, the reverse thrust causes the nut (3) to move backward, the inner gear ring (6) bends backward and radially outward, and pushes and squeezes the inner gear piece (61) to elastically deform and open radially outward, and is tightly pressed against the inner wall of the rotating sleeve.

2. A locking drill chuck as claimed in claim 1, It is characterized in that The nut (3) is an integral nut, the drill chuck is provided with a clamping ring (8), the clamping ring (8) is arranged at the front end of the nut (3), the clamping ring (8) comprises an integral and continuous pressing ring body (81) and a plurality of elastic clips (82) located in a circle around the inner hole of the pressing ring body (81), and the drill body (1) is provided with an annular groove (13) that cooperates with the elastic clips (82).

3. A locking drill chuck as claimed in claim 1, It is characterized in that A circle of inner tooth plates is arranged on the first circle-shaped base body (60) of the inner tooth ring (6), and a plurality of gaps (62) are arranged in the circle of inner tooth plates (61) so that the inner tooth plates (61) have elasticity and can undergo the elastic deformation.

4. A locking drill chuck as claimed in claim 2 or 3, It is characterized in that The first ring-shaped base (60) of the inner gear ring (6) is placed on the step, and the first ring-shaped base (60) of the inner gear ring (6) has a radially outer suspended portion (63), and the inner tooth plate (61) is bent and arranged at the outer edge of the suspended portion (63).

5. A locking drill chuck as claimed in claim 4, It is characterized in that A ring-shaped bearing steel ball cavity is provided between the inner gear ring (6) and the nut (3), and a bearing steel ball (7) is arranged in the bearing steel ball cavity. The bearing steel ball cavity has an action surface facing backward and radially outward, and when working, the bearing steel ball is squeezed radially outward and the inner gear piece (61) is elastically deformed radially outward.

6. A locking drill chuck as claimed in claim 5, It is characterized in that The locking element (5) comprises a second annular base (50), the second annular base (50) of the locking element (5) being located between the first annular base (60) of the inner gear ring (6) and the rear end of the nut (3), the second annular base (50) of the locking element (5) and the inner gear ring (6) together enclosing the annular bearing steel ball cavity, and the second annular base (50) of the locking element (5) being provided with the rearward and radially outward action surfaces (501).

7. A locking drill chuck as claimed in claim 1, It is characterized in that The inner gear ring (6) forms a circumferential fit with the drill body (1) to prevent relative rotation through the radially inward protrusion of the inner hole wall of the first ring-shaped base body (60).

8. A locking drill chuck as claimed in claim 7, It is characterized in that The drill body (1) is provided with a plurality of arc grooves (12) by axially drilling holes at its edge. The first ring-shaped base body (60) of the inner gear ring (6) is a sheet-shaped ring body, and an arc protrusion (65) is formed on the periphery of its inner hole to cooperate with the arc grooves.

9. A locking drill chuck as claimed in claim 1, It is characterized in that The locking element (5) comprises a second ring-shaped base (50), and a plurality of lock structures are arranged on the second ring-shaped base (50) of the locking element (5), each lock structure comprising the spring sheet (51) and an outward control protrusion (53) connected to the spring sheet (51), the end of the spring sheet (51) being the outwardly tilted lock end (52), the inner wall of the rotating sleeve being provided with a cam surface for controlling and cooperating with the outward control protrusion (53), the locking element (5) being further provided with an outward connection protrusion (54) integral with the locking element, and the rotating sleeve being provided with a connection groove for cooperating with the outward connection protrusion (54).

10. A locking drill chuck as claimed in claim 1, It is characterized in that The outer side surface of the inner tooth plate (61) is provided with an outer ratchet tooth (64) which is opposite in direction to the ratchet tooth of the inner gear ring (6), and the inner wall of the rotating sleeve is provided with a second inner ratchet tooth (43) which can mesh with the outer ratchet tooth (64).

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