CN216706066U - Drill bit and switching composite structure thereof - Google Patents

Abstract

The utility model discloses a drill bit and a switching combined structure thereof, and belongs to the field of drill bits. The drill bit comprises a drill body and a drill handle positioned at one end of the drill body; the drillstock have with spanner adapter complex clamping part, this clamping part includes centre gripping section and torque section, wherein: the clamping section is a cylindrical structure connected with the drill body, and at least part of the cylindrical surface of the clamping section is used as a locking clamping surface during clamping; the torque section is located at the trailing end of the clamping section and has at least one torque surface for transmitting torque. The adapter mainly comprises a sleeve and a lock sleeve, and the drill bit can be quickly installed. For traditional hexagonal prism drillstock, this scheme separately sets up centre gripping section and torsion section, and cylindric structure on the drillstock can have great size, and intensity is higher, and the difficult fracture condition that takes place can be applicable to electric drill and spanner power device.

Description

Drill bit and switching composite structure thereof

Technical Field

The utility model relates to the technical field of drill bits, in particular to a drill bit and a switching combined structure thereof.

Background

The tapered drill is generally used for drilling operations, such as the drill shown in fig. 1, the working part of the drill is a stepped taper, each step corresponds to a different size, and thus, the drill can meet the drilling requirements of different apertures on the plate by using one drill.

The shank of such present cone drill bits typically have three configurations for holding the bit in place. The first is a hexagonal handle, which is suitable for a device equipped with a three-jaw chuck or a hexagonal quick-change chuck, but the hexagonal handle is relatively thin, and under the condition of large torsion, the phenomenon of handle breakage, i.e., the connection between the conical body and the hexagonal handle is broken, as shown in fig. 2.

The round handle and the three-square handle are thicker and have higher strength relative to the hexagonal handle, so that the hexagonal handle can be normally used under the condition of larger torsion, and the breakage is avoided. However, when the handle is thick, the handle is only suitable for equipment with a three-jaw chuck and is not suitable for equipment with a hexagonal quick-change chuck. That is, this structure is difficult to apply to an electric wrench.

In order to overcome the problem of fracture, various methods exist in the industry, one is to arrange a thickened transition section at the connecting part of the drill handle and the drill body so as to enhance the bearable torsion, and the fracture situation still exists. The other is the mode shown in fig. 3, the drill bit is made into a shank-free mode, an external connecting structure is added, and the drill bit can be directly applied to the electric wrench through a threaded connecting mode. However, when the drill bit with the structural form is used, the threads bear torsion, the situation of sliding wires exists quickly, and the service life is short.

Therefore, how to arrange the drill bit structure so that the drill bit structure can be well applied to the electric wrench is a problem which is difficult to overcome in the industry at present.

SUMMERY OF THE UTILITY MODEL

The utility model provides a drill bit structure, which aims at solving the problem that a drill bit in the prior art cannot be simultaneously suitable for a drilling machine and an electric wrench under the condition of meeting certain strength.

In order to solve the above problems and achieve the corresponding purpose, the technical solution provided by the present invention is specifically:

the utility model relates to a drill bit, which comprises a drill body and a drill handle positioned at one end of the drill body; the drillstock have with spanner adapter complex clamping part, this clamping part includes centre gripping section and torque section, wherein:

the clamping section is a cylindrical structure connected with the drill body, and at least part of the cylindrical surface of the clamping section is used as a locking clamping surface during clamping;

and the torsion section is positioned at the tail end of the clamping section and is provided with at least one torsion surface for transmitting torque.

As an improvement of the drill bit, the section of the torsion section is of a non-circular structure, and the torsion surface is a plane or an arc surface formed on the side wall of the torsion section.

As an improvement of the drill bit, a plurality of torsion surfaces are uniformly distributed on the torsion section, and edges are formed between the adjacent torsion surfaces.

As an improvement of the drill bit, the number of the torque surfaces is four, and the torque sections are of a quadrangular prism structure.

As a modification of the drill, the size of the clamping section and the torsion section in the radial direction is in the range of 8-12 mm.

As a modification of the drill, the clamping section is circular in cross-section, and the radial dimension of the clamping section increases gradually in the axial direction away from the drill body, and the increasing radial dimension is not more than 1.6 mm.

As an improvement of the drill bit, the length of the clamping section is 1.5-3.0 times of the length of the torsion section.

As an improvement of the drill bit, the drill body is conical, the radial dimension of the drill body is increased from the tip to the drill tail, and the radial dimension of the drill tail is larger than that of the drill handle.

The utility model also provides a drill bit switching combined structure, which comprises the drill bit and an adapter, wherein the adapter mainly comprises a sleeve and a lock sleeve which are of cylindrical structures, one end of the sleeve is provided with an interface connected with an external power source, and the other end of the sleeve is in threaded connection with the lock sleeve;

a twisting hole and a clamping hole are axially arranged in the sleeve, and after the drill bit is installed, the twisting hole is matched with the twisting section to transmit torque;

the clamping section is at least partially positioned in the clamping hole, and the clamping section is clamped and locked or unlocked by controlling the threaded engagement length of the sleeve and the lock sleeve.

As an improvement of a drill switching combined structure, the sleeve mainly comprises a sleeve opening section, a thread section and a clamping jaw which are coaxially and sequentially arranged, and one end of the sleeve opening section, which is close to the thread section, is provided with the twisting hole;

the clamping holes are formed in the areas surrounded by the clamping jaws, one end of the lock sleeve can be sleeved on the clamping jaws and meshed with the thread section, and an annular inclined surface is formed on the inner side of the other end of the lock sleeve and used for enabling the clamping jaws to approach the central shaft to lock the clamping section.

As an improvement of the drill switching combined structure, the number of the clamping jaws is 3 or 4, the clamping jaws are uniformly distributed along the circumferential direction, and gaps are reserved between the adjacent clamping jaws.

As an improvement of a drill bit switching combined structure, the outer side surface of the front end of the clamping jaw is of an inclined surface structure and is used for being matched with the inner inclined surface of the lock sleeve, and when the two inclined surfaces are in contact extrusion, the end part of the clamping jaw approaches to the axis; when the two inclined planes are far away from each other, the clamping jaw is reset through self elasticity.

As an improvement of the drill switching combination structure, the inclined plane structure of the clamping jaw is formed by gradually reducing the thickness of the outer wall of the front end of the clamping jaw; the inner side inclined plane of the lock sleeve is formed by gradually reducing the radial dimension of the inner side wall at the position close to the port.

As an improvement of the drill switching combined structure, a positioning surface is formed at the joint of the clamping section and the torsion section, and the maximum depth of the torsion section inserted into the torsion hole is limited by the positioning surface.

As an improvement of a drill bit switching combined structure, an interface connected with an external power source is a wrench interface, the cross section of the wrench interface is of a quadrilateral structure, an annular groove is formed in the neck of the outer side wall of the looping section, and a bolt hole is formed in the annular groove.

As an improvement of the drill bit switching combined structure, the twisting hole is communicated with the wrench interface.

Compared with the prior art, the technical scheme provided by the utility model has the following beneficial effects:

(1) the improved drill handle of the drill bit has a clamping part with a cylindrical structure, and the clamping part comprises a clamping section and a torque section with a prismatic structure, wherein the clamping section can clamp the drill bit and bear certain torque force at the same time, so that the drill bit can be directly used for a drilling tool with a three-jaw chuck; when being used for electric spanner, realize the connection of drill bit through spanner adapter, and then accessible torsion section provides great torsion to the drill bit, and the centre gripping section can make the drill bit be difficult for droing. For traditional hexagonal prism drillstock, this scheme separately sets up centre gripping section and torsion section, and cylindric structure on the drillstock can have great size, and intensity is higher, the difficult fracture condition that takes place.

(2) The drill bit switching combined structure provided by the utility model has the advantages that the adopted adapter mainly comprises the sleeve and the lock sleeve, the drill bit can be quickly installed, and the drill bit switching combined structure has a good locking and anti-falling effect. Compared with the traditional hexagonal quick-change chuck, the novel hexagonal quick-change chuck has the advantages that the clamping requirement of a thicker drill shank can be met, the structure is simple, and a smaller radial space is occupied.

Drawings

FIG. 1 is a view of a conventional conical step drill (pagoda drill);

FIG. 2 is a schematic view of a broken position of a drill shank of a conventional conical step drill;

FIG. 3 is a schematic view of a drill bit in the form of a threaded connection;

FIG. 4 is a schematic view of a modified drill shank;

FIG. 5 is a schematic view of the structure of the drill body and the drill handle of the twist drill;

FIG. 6 is a schematic view of an embodiment of a tapered step drill and a drill shank thereof;

FIG. 7 is a schematic view of another embodiment of a tapered step drill and a drill shank thereof;

FIG. 8 is a schematic perspective view of a quadrangular prism-shaped drill shank;

FIG. 9 is a schematic view of an embodiment of an inverted cone structured drill bit;

FIG. 10 is a schematic view of the disassembled structure of the drill, the lock sleeve and the sleeve;

FIG. 11 is a schematic view of the inner engagement structure of the lock sleeve and the sleeve;

fig. 12 is a schematic view illustrating an installation effect of the adapter and the pagoda drill.

Description of reference numerals:

11. drilling a body; 12. a tip; 13. drilling a tail;

14. a drill shank; 141. a clamping section; 142. a torsion section; 141. a torque surface; 1422, edge; 1423. positioning the surface; 143. a transition step; 15. a chip groove;

2. a lock sleeve; 21. an internal thread; 22. a force application inclined plane;

3. a sleeve; 31. a cuff section; 32. a threaded segment; 33. a clamping jaw; 34. twisting holes; 35. a clamping hole; 36. pressing the inclined plane; 37. a wrench interface.

Detailed Description

For a further understanding of the utility model, reference should be made to the following detailed description taken in conjunction with the accompanying drawings and examples.

The structure, proportion, size and the like shown in the drawings are only used for matching with the content disclosed in the specification, so that the person skilled in the art can understand and read the description, and the description is not used for limiting the limit condition of the implementation of the utility model, so the method has no technical essence, and any structural modification, proportion relation change or size adjustment still falls within the scope of the technical content disclosed by the utility model without affecting the effect and the achievable purpose of the utility model. In addition, the terms "upper", "lower", "left", "right" and "middle" used in the present specification are for clarity of description, and are not intended to limit the scope of the present invention, and the relative relationship between the terms and the relative positions may be changed or adjusted without substantial technical changes.

Example 1

Referring to fig. 4, a drill of the present embodiment includes a drill body 11 and a drill shank 14 at one end of the drill body 11, wherein the drill body 11 and the drill shank 14 are coaxially disposed. In this embodiment, the drill shank 14 has a clamping portion for engaging with a wrench adaptor, and the clamping portion is a portion of the drill bit that needs to engage with the clamping device when the drill bit is being clamped. The clamping portion includes a clamping section 141 and a torque section 142, and the clamping section 141 and the torque section 142 can be used to mate with a wrench adaptor. For an electric wrench, a wrench adapter is an adapter that can be used in an electric wrench.

Specifically, the clamping section 141 of the drill shank 14 is a cylindrical structure connected with the drill body 11, and the cylindrical surface is used as a locking clamping surface during clamping. The torque section 142 is located at the trailing end of the clamp section and has at least one torque surface 1421 for transmitting torque.

Set up the drillstock portion into cylindrical structure in this embodiment to radial dimension can be great relatively, satisfies the clamping demand of triangle chuck on the electric drill. And the clamping section 141 and the torsion section 142 that set up make this drill bit can cooperate with the adapter of electric spanner and use on the electric spanner, can satisfy the user demand of electric drill and electric spanner simultaneously.

The adapter of the electric wrench comprises a sleeve 3 and a lock sleeve 2, and with reference to fig. 10 and 11, the sleeve 3 is mainly formed by coaxially and sequentially connecting a sleeve opening section 31, a thread section 32 and a clamping jaw 33, one end of the sleeve opening section 31, which is close to the thread section 32, is provided with a twisting hole 34, and the twisting hole 34 is matched with a twisting section 142. Taking the bit structure of fig. 4 as an example, it has a torsion surface 1421, which is a planar structure, and the rest is a circular arc segment, i.e. the torsion segment is formed by cutting a plane on a cylinder. The twist hole 34 also has a plane, the rest part is a circular arc hole-shaped structure, when the two are matched, the two planes are corresponding, and the circular arc section is corresponding to the circular arc hole, so that the matching of the two is realized.

One end of the lock sleeve 2 of the adapter can be sleeved on the clamping jaw 33 and meshed with the thread section 32, and an annular inclined surface is formed on the inner side of the other end of the lock sleeve 2 and used for enabling the clamping jaw 33 to approach to the central shaft to lock the clamping section 141.

The socket section 31 of the adapter is provided with a wrench socket 37 at the end far away from the jaw for connecting with a connector of a wrench device. The wrench interface 37 may be a hole-shaped structure or a prism structure, and is mainly used for matching with an external power part, without any particular limitation.

When the clamping device is applied to an electric wrench, the lock sleeve 2 meshed on the threaded section 32 is rotated to loosen the clamping jaws 33 to a natural state, then the drill shank is inserted, the torsion section 142 is inserted into the twisting hole 34 for positioning, then the lock sleeve 2 is screwed on the threaded section 32, the clamping jaws 33 are close to a central shaft through the inclined surfaces on the inner side of the lock sleeve 2, then the cylindrical surface of the clamping section 141 is pressed, and the clamping jaws interact to realize locking and fixing of the clamping section 141.

Most of traditional drill bits are provided with annular grooves on a drill shank to meet clamping requirements and achieve axial positioning, but due to certain redundancy, the drill bits are easy to shake during drilling and also are a factor causing breakage of the drill bits. The embodiment is improved in structure, the torque section 142 is used for mainly providing torque, the clamping section 141 is used for preventing the drill bit from falling off, and the electric wrench can be applied to further improve the anti-fracture effect. Because the drill bit is all locked at circumference and axial after the centre gripping, drilling accuracy is also higher.

It should be noted that the cylindrical structure of the clamping segments mentioned in this embodiment and other parts of the specification does not exclude the formation of a partial cross section on the cylinder or the formation of concave structures, as long as the cylindrical shape can be substantially maintained, clamping can be performed without affecting the force, and the like should be considered within the scope of the present invention.

In addition, the key point of this embodiment is the structural improvement of the drill shank 14, and the structure of the drill bit in this embodiment can be adopted when different types of drill bits need to be used on the electric wrench. The drill bit adopting the structure is more of the drill bit with the easily broken drill handle, and generally speaking, the radial size of the tail of the drill bit is larger than that of the drill handle.

The drill bit of the embodiment is not limited to be used on an electric wrench, and can also be used on a power device such as an air wrench connected by an adapter. This implementation provides a drill bit structure, makes it can have more and connects the mode of use through the adapter.

Fig. 5 shows a schematic structural diagram of a twist drill, in which a portion for providing torque is also provided on a drill shank portion, but in the case of the twist drill, a drill shank portion and a drill shank portion are mostly the same in diameter or slightly different, and the drill shank portion is more easily broken, and the problem of breakage of the drill shank does not exist, and the twist drill is not understood to be included in the scope of the present patent. It should be noted that, when clamping, the torsion portion is provided to provide both torsion and clamping position, and the cylindrical portion is not understood as the clamping segment in this embodiment.

Example 2

With reference to fig. 6-8, the present embodiment provides a tapered stepped drill bit, which includes a stepped drill body 11 and a drill shank 14 disposed coaxially with the drill body 11, wherein a tip 12 is formed at a front end of the drill body 11, a drill tail 13 is formed at a rear end of the drill body 11, a radial dimension of the drill body 11 increases from the tip 12 to the drill tail 13, and the radial dimension of the drill tail 13 is greater than that of the drill shank 14.

The drill body 11 is provided with a chip groove 15. The chip flutes 15 can be designed as a spiral or straight flute, through which chip flutes 15 chips produced during drilling can be removed. In addition, a cutting edge can be formed at the chip groove 15 for rapid drilling.

The flutes on the drill body 11 may be arranged in pairs symmetrically about the central axis of the drill body 11. The stepped drill body 11 can form drilling steps with different sizes, and when the drill is used, the drilling depth can be selected according to requirements. Of course, for some drills that drill sheet, the flutes may not be provided.

The stepped structure of the drill body 11 requires a larger torque due to a larger diameter of the drilled hole, and thus, when a larger hole is drilled, the joint position of the drill shank 14 and the drill body 11 is often broken due to a larger torque. The embodiment has better use effect of the drill bit through the structural improvement of the drill shank 14.

As a further illustration of this embodiment, the torsion section 142 is a prismatic structure for transmitting torque. For example, three torque surfaces 1421 may be symmetrically disposed, with an edge 1422 formed between adjacent torque surfaces, generally resembling a triangular prism.

The size of the clamping section 141 and the torsion section 142 in the radial direction is 8-12mm in this embodiment. The dimensional range of the torque section 142 in the radial direction refers to the range of the largest dimension in its cross section, not the side length of its edge.

By way of further limitation, the clamping section 141 and the torsion section 142 have a dimension in the radial direction in the range of 8-10 mm.

The diameter of a common hexagonal prism drill handle is smaller in order to adapt to a hexagonal quick-change chuck, and the diameter is generally 6 mm. The size is easy to break, the drill handle in the embodiment can be 8mm or even 10mm, and the overall strength is higher.

Example 3

In combination with fig. 7 and 8, as an implementation manner, the torsion segment of the present embodiment has a quadrangular prism-shaped structure. Compared with a triangular prism, the strength of the four-prism is higher under the condition of the same size. For the hexagonal prism, the torsion that the quadrangular can transmit is bigger, the edge slipping of avoiding that can be better.

The prism structure in this embodiment means that the overall shape of the prism structure forms four prisms and four sides, and the edge is not required to be a geometrically straight line segment, allowing the prism structure to have a certain width, a chamfer, a protrusion or a recess.

Preferably, as shown in fig. 7, a transition step 143 may be further disposed at a connection position between the clamping section 141 and the drill body 11, and a size of the transition step is larger than a size of the clamping section cylinder, so that connection transition between the clamping section and the drill body is realized, and stress concentration is avoided.

Example 4

Further, on the basis of the foregoing embodiment, the two side surfaces of the quadrangular prism-like structure are connected by an arc having the same diameter as the diameter of the clamping section 141, i.e., the diagonal dimension of the quadrangular prism is the same as the radial dimension of the cylinder of the clamping section 141. Taking the radial dimension of the clamping section 141 as 10mm as an example, the diagonal dimension of the torsion section prism is also 10mm, and the distance between the opposite sides of the quadrangular prism can be 8 mm.

By adopting the structure, the larger size of the torsion section prism can be ensured firstly, and the prism structure of the torsion section can be obtained by processing the cylinder, so that the torsion section is still of an integral structure with the clamping section 141 substantially, and the strength is ensured without sudden change of the size in the radial direction. Next, a step is formed between the side surface of the quadrangular prism and the cylindrical surface of the holding section 141 as a positioning surface 1423, which can position the installation of the drill.

Example 5

When the drill bit is used, a certain force is needed for upwards pulling out the drill bit in the drilling process, if the drill bit is not tightly clamped, the drill bit is easy to fall off, and certain personal damage is easily caused after the drill bit falls off due to high-speed rotation of the drill bit. The present embodiment further optimizes the drill shank construction, in particular the clamping section 141 of the present embodiment increases in radial dimension gradually in the axial direction away from the drill body, with the increasing radial dimension being no more than 1.6 mm.

By adopting the structure, the clamping section 141 has a certain inverted conical shape, so that the clamping section can be clamped on the three-jaw chuck of the electric drill or the clamping jaw of the electric wrench adapter, the stability of clamping can be improved, and a better anti-falling effect is achieved.

In addition, the increased radial dimension is controlled within 1.6mm, preferably 0.6-0.8mm, so that the clamping jaw can realize clamping and locking without too large deformation. In the embodiment, the clamping jaws are clamped through self deformation, so that the clamping jaws need to be reset after the lock sleeve is loosened. On the basis of satisfying the loading and unloading, the size should be controlled to be increased as much as possible to reduce the volume.

Example 6

As an implementation manner, the length of the clamping section 141 in this embodiment is 1.5-3 times of the length of the torsion section 142, and further can be controlled to be 1.8-2.4 times, if the length of the torsion section 142 is 10mm, the clamping section 141 can be set to 18mm, 20mm, 24mm, and so on.

For a conical step drill, an adapter of the conical step drill is generally made of a rigid material, and in order to enable a clamping jaw of the conical step drill to have a certain elastic space, the clamping jaw needs to have a certain length, otherwise, the deformation quantity cannot meet the requirement, or the effect is relatively poor. The torsion section 142 is more important to provide torsion, and under the condition of enough strength, a larger length is not needed, and the whole volume can be better controlled through the control of the proportion of the two parts on the drill shank.

Example 7

In conjunction with fig. 9, this embodiment shows another schematic structure of the drill bit, which can be used for woodworking drilling. The front end of the drill body of the drill bit is provided with a tip, and the size of the drill body towards the drill tail part is reduced and is of an inverted cone structure. But obviously, the diameter of the drill body is far larger than that of the drill handle, and the hexagonal handle structure is also adopted in the prior art, and the drill handle also has the problem of easy breakage.

This embodiment adopts the drillstock structure after the improvement, divide into torque section and centre gripping section with the drillstock, makes it can use with electric drill and electric spanner, perhaps other power device who adopts the adapter to be connected.

Example 8

With reference to the foregoing embodiments, fig. 10 and fig. 11, the present embodiment provides a drill bit switching combination structure, which includes the drill bit and further includes an adapter, the adapter in this embodiment mainly includes a sleeve 3 and a lock sleeve 2, one end of the sleeve 3 is provided with an interface connected to an external power source, and the other end of the sleeve is in threaded connection with the lock sleeve 2.

The sleeve 3 is provided with a twisting hole 34 and a clamping hole 35 along the axial direction, and after the drill bit is installed, the twisting hole 34 is matched with the twisting section 142 for transmitting torque. Here, the fit is to be consistent in shape so that they can be snapped into each other. The clamping section 141 of the drill bit is at least partially located in the clamping hole 35, and the clamping section 141 is clamped and locked or unlocked by controlling the threaded engagement length of the sleeve 3 and the lock sleeve 2. When the lock sleeve and the sleeve are mutually screwed, the clamping section 141 is positioned in the clamping hole and clamped by the sleeve 3, otherwise, the clamping section 141 is loosened and can be detached.

As the optimization of the embodiment, the sleeve 3 is mainly formed by coaxially and sequentially connecting a sleeve opening section 31, a threaded section 32 and a clamping jaw 33, the lock sleeve 2 penetrates through the clamping jaw 33 to be meshed with the threaded section 32, the connection between the lock sleeve 2 and the sleeve 3 is realized, and meanwhile, the drill bit can be locked. The socket section 31 of the adapter is provided with a wrench interface 37 for connecting a connector of a wrench device.

A torsion hole 34 is formed at one end of the collar section 31 close to the threaded section 32, the torsion hole 34 is matched with the torsion section 142, and the depth of the torsion hole 34 can be set according to the length of the torsion section 142. For example, as shown in fig. 11, the twist hole 34 may extend through the threaded section 32 and have a certain extension in the collar section 31, and the threaded section 32 and the collar section 31 have a larger thickness to provide sufficient twisting force. Of course, the twist bore 34 may also occupy only the threaded section 32 or the spigot section 31 alone, by varying the length of the twist section on the drill shank.

The jaws 33 are formed by portions of the threaded section 32 extending outwardly so that the axis about which the jaws 33 are disposed is coaxial with the threaded section 32. The number of the clamping jaws 33 can be multiple, and generally 3 or 4 can be selected.

In this embodiment, the plurality of jaws 33 are uniformly distributed in the circumferential direction, and a gap is left between adjacent jaws. The cross-section of clamping jaw 33 is the arc structure, and has certain length in the axial, and after screwing up the lock sleeve and making the clamping jaw receive the extrusion force, the one end that clamping jaw 33 kept away from screw thread section 32 can inwards be extruded to locking clamping section. When the lock sleeve is released, the jaws 33 are restored by their own elasticity.

Example 9

This embodiment provides a lock sleeve structure, and lock sleeve 2 is tube structure, and 2 one end inboards of lock sleeve are provided with internal thread 21, can the suit on clamping jaw 33 and with screw thread section 32 meshing, clamping jaw 33 also is located inside the lock sleeve simultaneously. An annular force application inclined surface 22 is formed on the inner side of the other end of the lock sleeve 2, and the radial dimension of the annular force application inclined surface 22 is gradually reduced in the direction away from the thread section, namely the radial dimension of the inner side wall is gradually reduced in the position close to the port.

In this embodiment, the outer side surface of the front end of the clamping jaw 33 is an inclined surface structure, and the thickness of the outer wall of the front end of the clamping jaw 33 is gradually reduced along the direction departing from the threaded section, so as to form a pressing inclined surface 36. The press-fit slope 36 is engaged with the inner force application slope 22 of the lock case 2. As shown in fig. 11, when the lock sleeve 2 is screwed to the left, the engagement length of the screw thread section increases, and the force application inclined surface 22 presses the pressing inclined surface 36 to the left, so that the holding jaw 33 approaches the center axis to lock the holding section 141. When the lock sleeve 2 is unscrewed to the right side, the pressing inclined surface 36 is gradually released, the clamping jaw 33 is reset, and the clamping section 141 is further released.

Example 10

In one embodiment, a positioning surface 1421 is formed at the junction of the clamping section 141 and the torsion section 142, and the maximum depth of the torsion section 142 inserted into the torsion hole is defined by the positioning surface. If the torsion hole 34 is a rectangular hole, only the torsion section 142 of the quadrangular prism structure is allowed to be inserted in alignment, and the insertion depth of the drill is positioned.

The length of the internal thread 21 in the bore of the sleeve 2 should be greater than the length of the threaded section 32 so that it can be fully screwed into the threaded section 32.

In addition, the whole length of the drill shank is required to be greater than the sum of the lengths of the twisting hole 34 and the clamping hole 35, as shown in fig. 12, after the drill bit and the adapter are installed, a certain distance is reserved between the drill adapter and the drill body, and a certain space is reserved for screwing out the lock sleeve.

As another embodiment, the force application slope 22 and the pressing slope 36 may be oppositely arranged, i.e. formed by gradually increasing radial dimension in the direction away from the thread section. Under the structure, when the lock sleeve rotates towards the direction of the looping section 31, the clamping jaws can be loosened, and a certain screwing-out distance does not need to be reserved.

Example 11

As an embodiment of the wrench interface, this embodiment can be implemented in combination with the component structure in the above-described embodiment. Since the general electric wrench connector is mostly of a quadrangular structure, the wrench socket 37 is a square opening matched with the connector. The twist hole 34 extends through the threaded section 32 and communicates with the wrench socket 37 for ease of machining.

It should be noted that, when the cross section of the wrench interface 37 is a quadrilateral structure, the center of the twisting hole 34 coincides with the center of the wrench interface 37, the embodiment does not limit the parallel arrangement of the twisting hole 34 and the side of the wrench interface 37, and the position of the side of the twisting hole 34 can be determined comprehensively according to the processing convenience, the cost and other factors under the condition of allowable space and strength. An annular groove can be arranged at the neck part of the outer side wall of the looping section 31, and a bolt hole is arranged on the annular groove. When the wrench device is connected with the joint, the pin is inserted into the bolt hole, and the rubber ring or the metal snap ring on the pin is sleeved on the annular groove to prevent the pin from falling off.

When the electric drill is used for electric drilling, the drill handle 14 can be directly inserted into the three-jaw clamping hole of the electric drill, and the electric drill can be locked and fixed, so that drilling processing can be performed. Since the size of the clamping section 141 is not smaller than that of the torque section 142, even the quadrangular strong torque section 142 does not affect the clamping fixation.

When the electric wrench is used, the drill shank 14 of the conical stepped drill is inserted into the sleeve 3, the torque section 142 enters the twisting hole 34, and the clamping section 141 is positioned in the corresponding interval of the clamping jaw 33; the sleeve 3 is then tightened so that the jaws 33 fit tightly inwardly against the clamping segments 141 to effect a locking fixation of the drill shank 14, which can then be mounted on a power wrench for drilling.

The present invention and its embodiments have been described above schematically, without limitation, and what is shown in the drawings is only one of the embodiments of the present invention, and the actual structure is not limited thereto. Therefore, if the person skilled in the art receives the teaching, without departing from the spirit of the utility model, the person skilled in the art shall not inventively design the similar structural modes and embodiments to the technical solution, but shall fall within the scope of the utility model.

Claims (16)

1. A drill bit comprises a drill body and a drill handle positioned at one end of the drill body; the method is characterized in that: the drillstock have with spanner adapter complex clamping part, this clamping part includes centre gripping section and torque section, wherein:

the clamping section is a cylindrical structure connected with the drill body, and at least part of the cylindrical surface of the clamping section is used as a locking clamping surface during clamping;

and the torsion section is positioned at the tail end of the clamping section and is provided with at least one torsion surface for transmitting torque.

2. The drill bit of claim 1, wherein: the section of the torsion section is of a non-circular structure, and the torsion surface is a plane or an arc surface formed on the side wall of the torsion section.

3. The drill bit of claim 2, wherein: a plurality of torsion surfaces are uniformly distributed on the torsion sections, and edges are formed between the adjacent torsion surfaces.

4. The drill bit of claim 3, wherein: the number of the torsion surfaces is four, and the torsion sections are of quadrangular structures.

5. The drill bit of any one of claims 1-4, wherein: the size range of the clamping section and the torsion section in the radial direction is 8-12 mm.

6. The drill bit of any one of claims 1-4, wherein: the cross section of the clamping section is circular, the radial dimension of the clamping section is gradually increased in the axial direction far away from the drill body, and the increased radial dimension is not more than 1.6 mm.

7. The drill bit of any one of claims 1-4, wherein: the length of the clamping section is 1.5-3.0 times of the length of the torsion section.

8. The drill bit of claim 1, wherein: the drill body is conical, the radial size of the drill body is continuously increased from the tip to the drill tail, and the radial size of the drill tail is larger than that of the drill handle.

9. A drill bit switching integrated configuration which characterized in that: the drill bit comprises the drill bit as claimed in any one of claims 1 to 8, and further comprises an adapter, wherein the adapter mainly comprises a sleeve and a lock sleeve, the sleeve is of a cylindrical structure, one end of the sleeve is provided with an interface connected with an external power source, and the other end of the sleeve is in threaded connection with the lock sleeve;

a twisting hole and a clamping hole are axially arranged in the sleeve, and after the drill bit is installed, the twisting hole is matched with the twisting section to transmit torque;

the clamping section is at least partially positioned in the clamping hole, and the clamping section is clamped and locked or unlocked by controlling the threaded engagement length of the sleeve and the lock sleeve.

10. The drill bit adapter assembly of claim 9, wherein:

the sleeve is mainly composed of a sleeve opening section, a threaded section and a clamping jaw which are coaxially and sequentially arranged, and the twist hole is formed in one end, close to the threaded section, of the sleeve opening section;

the clamping holes are formed in the areas surrounded by the clamping jaws, one end of the lock sleeve can be sleeved on the clamping jaws and meshed with the threaded section, and an annular inclined surface is formed on the inner side of the other end of the lock sleeve and used for enabling the clamping jaws to approach the central shaft to lock the clamping section.

11. The drill bit transition assembly of claim 10, wherein: the clamping jaws are 3 or 4 and are uniformly distributed along the circumferential direction, and gaps are reserved between the adjacent clamping jaws.

12. The drill bit transition assembly of claim 10, wherein: the outer side face of the front end of the clamping jaw is of an inclined plane structure and is used for being matched with the inner inclined plane of the lock sleeve, and when the two inclined planes are contacted and extruded with each other, the end part of the clamping jaw approaches to the axis; when the two inclined planes are far away from each other, the clamping jaw is reset through self elasticity.

13. The drill bit transition assembly of claim 12, wherein: the inclined plane structure of the clamping jaw is formed by gradually reducing the thickness of the outer wall of the front end of the clamping jaw; the inner side inclined plane of the lock sleeve is formed by gradually reducing the radial dimension of the inner side wall at the position close to the port.

14. The drill bit transition assembly of any one of claims 9-13, wherein: the joint of the clamping section and the torsion section is provided with a positioning surface, and the maximum depth of the torsion section inserted into the torsion hole is limited by the positioning surface.

15. The drill bit transition assembly of any one of claims 9-13, wherein: the connector connected with an external power source is a wrench connector, the cross section of the wrench connector is of a quadrilateral structure, an annular groove is formed in the neck of the outer side wall of the looping section, and a bolt hole is formed in the annular groove.

16. The drill bit transition assembly of claim 15, wherein: the twisting hole is communicated with the wrench connector.

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