CN213469675U

CN213469675U - Drill bit limiting device and electric drill

Info

Publication number: CN213469675U
Application number: CN202022455117.2U
Authority: CN
Inventors: 阳征辉; 刘建春; 田力
Original assignee: BYD Co Ltd; Guilin BYD Industrial Co Ltd
Current assignee: BYD Co Ltd; Guilin BYD Industrial Co Ltd
Priority date: 2020-10-28
Filing date: 2020-10-28
Publication date: 2021-06-18
Anticipated expiration: 2030-10-28

Abstract

The utility model relates to a drill bit stop device and electric drill, wherein stop device includes: the basal body is used for being fixed on the drill bit shell and coaxially sleeved on the periphery of the drill bit; the telescopic part is coaxially arranged at the front end of the base body in a back-and-forth movable mode, and a through hole allowing the drill bit to extend forwards is formed at the front end of the telescopic part; and a locking portion for locking the telescopic portion at least axially on the base body. Through the stop device in the embodiment of the disclosure, drilling depth can be more accurate to produce high-quality products, and adjustment that suits can be carried out according to different drilling depths, so that the device has a wide application range.

Description

Drill bit limiting device and electric drill

Technical Field

The utility model relates to a technical field that punches, specifically relates to a drill bit stop device and electric drill.

Background

The electric drill is a common drilling tool, and the working principle of the electric drill is that a drill bit is driven to rotate through the operation of a motor, so that the drill bit scrapes the surface of an object, and the object is better drilled through to complete drilling. In the related art, an operator usually performs drilling to a desired depth by controlling the amount of feed toward a surface to be processed by a hand-held electric drill according to the desired drilling depth. By adopting the processing mode, the operation is not proper when the drilling machine is used, so that the feeding amount is overlarge, and in some applications with high precision requirements on the drilling depth, the existing drilling mode can cause that the drilling depth is not satisfactory, other parts are damaged, and the reliability of a product is influenced.

SUMMERY OF THE UTILITY MODEL

The purpose of this disclosure is to provide a drill bit stop device and electric drill to solve the problem that exists in the relevant art at least in part.

In order to achieve the above object, the present disclosure provides a drill bit limiting device, including:

the basal body is used for being fixed on the drill bit shell and coaxially sleeved on the periphery of the drill bit;

the telescopic part is coaxially arranged at the front end of the base body in a back-and-forth movable mode, and a through hole allowing the drill bit to extend forwards is formed at the front end of the telescopic part; and

and the locking part is used for at least axially locking the telescopic part on the base body.

Optionally, the telescopic portion is coaxially disposed inside the base, an opening is opened on the base, and the locking portion is configured to pass through the opening to lock the telescopic portion.

Alternatively, the openings may be formed on opposite sides of the base, and the locking portions may be configured to pass through the openings on both sides of the base, respectively, to lock on opposite sides of the telescopic portion.

Optionally, the opening is configured as a long hole extending in an axial direction of the drill bit, a groove is formed on an outer peripheral surface of the expansion portion, and the locking portion includes:

a locking pin capable of passing through the elongated hole and extending into a groove configured to match a profile of the locking pin such that the locking pin is capable of driving the telescoping portion to move along the elongated hole;

external threads formed on the outer surface of the base body; and

two nuts respectively formed with internal threads matching with the external threads,

when the locking pin extends into the groove, the two nuts can be clamped on two sides of the part, extending out of the base body, of the locking pin so as to limit the axial movement of the locking pin along the drill bit.

Optionally, the base body includes a large diameter section for mounting to the bit housing and a small diameter section tapered forward from a front end of the large diameter section, the external thread being formed on the small diameter section.

Optionally, the groove is formed at a position of the expansion portion near the rear end, and the length of the elongated hole is larger than the length of the expansion portion in the axial direction of the drill bit.

Optionally, the opening is configured as a threaded bore and the locking portion includes a threaded member threadably received through the opening and abutting against the telescoping portion.

Optionally, the drill bit housing includes a fixed portion and a rotating portion connected to the drill bit, the drill bit limiting device further includes a mounting sleeve for being sleeved on the periphery of the fixed portion, the base body is mounted on the drill bit housing by being screwed to the mounting sleeve, and the inner diameter of the base body is larger than the outer diameter of the rotating portion.

Optionally, the drill bit limiting device further comprises a protective pad arranged at the front end of the telescopic part, and the protective pad is constructed into a flexible annular structure.

According to a second aspect of the present disclosure there is also provided a power drill comprising a drill bit, a bit housing for mounting the drill bit and a bit stop as provided by the present disclosure.

Through above-mentioned technical scheme, when the drill bit stop device was installed to the electric drill, with the axial back-and-forth movement of pars contractilis along the drill bit, according to the length of required drilling depth adjustment drill bit stretching out in the through-hole of pars contractilis, then through the locking of pars contractilis to the extension length of control drill bit. When the drill bit is used for drilling, the expansion part can be abutted against the surface of the processed surface as the drill bit drills into the processed surface, so that the drilling depth is controlled. When the drilling depth changes, the locking part can be released to readjust the telescopic part, so that the extending length of the drill bit can be changed. Through the stop device in the embodiment of the disclosure, drilling depth can be more accurate to produce high-quality products, and adjustment that suits can be carried out according to different drilling depths, so that the device has a wide application range.

Additional features and advantages of the disclosure will be set forth in the detailed description which follows.

Drawings

The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure without limiting the disclosure. In the drawings:

fig. 1 is a schematic view of a construction of an electric drill provided in an exemplary embodiment of the present disclosure;

FIG. 2 is a schematic view of a portion of a substrate provided in accordance with an exemplary embodiment of the present disclosure;

fig. 3 is a schematic structural view of a telescopic part provided in an exemplary embodiment of the present disclosure;

FIG. 4 is a half-sectional view of a drill bit stop mounted to a drill bit housing provided by an exemplary embodiment of the present disclosure;

FIG. 5 is a front view of the half-section shown in FIG. 4;

FIG. 6 is an enlarged view of portion A of FIG. 5;

FIG. 7 is a schematic view of an installation of a drill bit stop provided by an exemplary embodiment of the present disclosure;

fig. 8 is a schematic view of an installation of a drill bit stop according to another exemplary embodiment of the present disclosure.

Description of the reference numerals

10 base 101 opening 11 major diameter section

12 small diameter section 20 drill bit shell 21 fixing part

22 rotating part 30 bit 40 telescoping part

41 through hole 42 groove 50 locking part

51 locking pin 52 external thread 53 nut

54 screw 60 mounting sleeve 70 protection pad

Detailed Description

The following detailed description of specific embodiments of the present disclosure is provided in connection with the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present disclosure, are given by way of illustration and explanation only, not limitation.

In the present disclosure, unless otherwise specified, terms of orientation such as "front and back" are used as they are defined by the usage convention, and specifically, refer to the direction of the drawing in fig. 5, where the upper part of the drawing in fig. 5 is front and the lower part is back. The inner and outer are defined according to the self-contour of the corresponding component. The terms "first and second" are used throughout this disclosure to distinguish one element from another, and are not sequential or significant. Furthermore, in the following description, when referring to the drawings, the same reference numerals in different drawings denote the same or corresponding elements.

As shown in fig. 1, the present disclosure provides a drill bit limiting device, which includes a base 10 fixed on a drill bit housing 20 and coaxially sleeved on the periphery of a drill bit 30, a telescopic part 40 movably installed at the front end of the base 10 in a back-and-forth manner, and a locking part 50 for axially locking the telescopic part 40 on the base 10 at least, wherein a through hole 41 for allowing the drill bit 30 to extend forward is formed at the front end of the telescopic part 40. Here, the base 10 is fitted around the outer periphery of the drill 30 to form a gap with the drill 30, and a gap is also formed between the expansion part 40 and the drill 30, so that the stopper does not interfere with the rotation of the drill 30. The telescopic part 40 is at least axially locked on the base body 10, meaning that the locking part 50 can lock the telescopic part 50 against movement in the extension direction of the drill bit 30, i.e. the length of the drill bit 30 protruding out of the through hole 41 remains unchanged after the locking part 50 locks the telescopic part 40. It will be appreciated that the locking portion 50 may also lock the telescoping portion 40 to remain fixed in any orientation.

Through the technical scheme, when the drill bit limiting device is installed on the electric drill, the telescopic part 40 moves back and forth along the axial direction of the drill bit, the length of the drill bit 30 extending out of the through hole 41 of the telescopic part 40 is adjusted according to the required drilling depth, and then the telescopic part 40 is locked through the locking part 50 so as to control the extending length of the drill bit 30. When the drill 30 is used to drill a hole, the expansion part 40 abuts against the surface of the workpiece surface as the drill 30 penetrates the workpiece surface, thereby controlling the depth of the drilled hole. When the depth of the drilled hole is changed, the locking portion 50 can be released to readjust the telescoping portion 40 to change the extension of the bur 30. Through the stop device in the embodiment of the disclosure, drilling depth can be more accurate to produce high-quality products, and adjustment that suits can be carried out according to different drilling depths, so that the device has a wide application range.

In the embodiment of the present disclosure, the telescopic portion 40 may be coaxially disposed on the inner side or the outer side of the base 10, and a clearance fit is formed between the telescopic portion 40 and the base 10 so as to enable relative movement therebetween. Referring to fig. 2, 4 and 5, when the extendable portion 40 is disposed inside the base 10, the base 10 may be provided with an opening 101, when the extendable portion 40 is adjusted, the extendable portion 40 may move back and forth inside the base 10, and after the adjustment is completed, the locking portion 50 may pass through the opening 101 to lock the extendable portion 40. In other embodiments, the extendable portion 40 may be coaxially disposed outside the base 10, in which case, the opening may be disposed on the extendable portion 40 located outside, and the locking portion 50 may pass through the opening on the extendable portion 40 to lock the extendable portion 40 to the base 10.

Further, based on the case where the stretchable part 40 is disposed inside the base 10, referring to fig. 2, openings 101 may be formed on opposite sides of the base 10, respectively, and the locking parts 50 may be disposed to be capable of passing through the openings 101 on both sides of the base 10, respectively, to lock on the opposite sides of the stretchable part 40. Through contralateral locking pars contractilis 40, can guarantee the reliable and stable of locking process to guarantee pars contractilis 40 and drill bit 30 and have higher axiality, avoid producing the interference to the working process of drill bit 30. In another embodiment, the number of the openings 101 may also be three, four or another number, a plurality of the openings 101 may be uniformly distributed in the circumferential direction of the base 10, and the locking portion 50 corresponding to the number of the openings can pass through the plurality of the openings 101 for locking.

In the disclosed embodiment, the locking portion 50 can be formed in various ways, such as in one embodiment, referring to fig. 8, the locking portion 50 can include a threaded member 54 that can pass through the opening 101 and abut against the outer wall of the telescoping portion 40, in which case the opening 101 can be configured as a threaded hole. After the front and rear adjustment of the telescopic part 40 is completed, the screw 54 is screwed with the opening 101, and the bottom end of the screw 54 is pressed against the telescopic part 40, so that the telescopic part 40 is locked by friction. When the extended length of the drill bit 30 needs to be adjusted, the screw member 54 is loosened. In order to ensure that the screw 54 can lock the expansion portion 40 at any position, the screw hole may be provided at a position near the front end of the base 10, or the screw hole may be provided in plural at intervals in the axial direction of the base 10. Here, the screw 54 may be sized such that the head of the screw 54 may just abut against the outer circumferential surface of the base body 10 after locking to the expansion part 40, so as to enable quick and accurate locking of the expansion part 40.

In another embodiment of the present disclosure, referring to fig. 2 to 6, the opening 101 may be configured as a long hole extending in the axial direction of the drill 30, a groove 42 is formed on the outer circumferential surface of the telescopic portion 40, the locking portion 50 may include a locking pin 51, an external thread 52 formed on the outer surface of the base body 10, and two nuts 53 capable of being matched with the external thread 52, the locking pin 51 may pass through the long hole and protrude into the groove 42, the groove 42 is configured to be matched with the profile of the locking pin 51, that is, the groove 42 may be a cylindrical groove having the same diameter as or a slightly larger diameter than that of the locking pin 51, so as to ensure that the locking pin 51 does not move or come off in a direction other than the radial direction of the telescopic portion 40. Two nuts 53 may be previously installed on the external thread 52 of the base body 10, then the expansion part 40 is placed on the inner side of the base body 10, the groove 42 is moved between the two nuts 53 arranged at intervals in the front-rear direction and the groove 42 is aligned with the elongated hole, and then the locking pin 51 is inserted into the groove 42 through the elongated hole, where the locking pin 51 does not completely protrude into the base body 10, but partially stays on the outer circumferential side of the base body 10 to facilitate driving and locking of the expansion part 40. Referring to fig. 7, when the locking pin 51 is inserted into the recess 42, two nuts 53 are screwed to be clamped on both sides of a portion of the locking pin 51 protruding from the base 10 to restrict the axial movement of the locking pin 51 along the drill 30. The width of the elongated hole may also be set to match the diameter of the locking pin 51, that is, as shown in fig. 7, the dimensions of the elongated hole and the locking pin 51 in the up-down direction of the drawing of fig. 7 are matched to limit the circumferential rotation of the telescopic part 40 by the locking pin 51. When the drilling depth becomes larger, that is, the length of the drill 30 extending out of the telescopic portion 40 needs to be increased, the nut 53 located on the front side (i.e., the right side in the drawing of fig. 7) can be screwed forward by a specified distance, then the locking pin 51 is moved, the telescopic portion 40 is driven to move forward to abut against the nut 53 on the front side by the matching of the locking pin 51 and the groove 42, and then the nut 53 on the rear side is screwed forward to abut against the rear side of the locking pin 51, so that the adjustment of the extending length of the drill 30 is completed. Through the arrangement of the structure, the adjusting process of the limiting device is more stable and reliable, the moving distance can be ensured to be more accurate through the matching mode of the threads, the accuracy of the drilling depth is improved, and the product quality is reliable.

In the embodiment of the present disclosure, in order to move the expansion part 40 more accurately, a scale may be provided on the outer circumferential wall of the expansion part 40 or the base 10. As provided at the outer peripheral wall of the expansion part 40, the scale may face the opening 101 together with the groove 42 to make the opening 101 a scale observation window. When the screw 54 or the nut 53 is used for locking, the extension length of the drill 30 can be adjusted according to the position of the corresponding scale, so that the drilling depth can be controlled.

Specifically, referring to fig. 3, the groove 42 may be formed at a position of the telescopic portion 40 near the rear end, and the length of the elongated hole may be greater than the length of the telescopic portion 40 in the axial direction of the drill bit 30, so that the telescopic portion 40 may be locked by the locking portion 50 at any position of the elongated hole, so that the telescopic portion 40 has a larger adjustable range, and the feasibility of the limiting device provided by the embodiment of the present disclosure is improved.

In the disclosed embodiment, referring to fig. 1 and 2, the base body 10 may include a large diameter section 11 for being mounted to the bit housing 20 and a small diameter section 12 tapered forward from a front end of the large diameter section 11, and an external thread 52 is formed on the small diameter section 12. When the locking part 50 comprises the nut 53, the nut 53 can be screwed on the small-diameter section 12, so that the small-size nut 53 can be used for installation, the size of the whole limiting device and parts of the limiting device can be reduced, the material cost is saved, the installation space is reduced, and the operation view of an operator is prevented from being influenced when the limiting device is used.

The drill housing 20 may include a fixing portion 21 and a rotating portion 22 connected to the drill 30, and the limiting device provided in the embodiment of the present disclosure may be directly sleeved on the fixing portion 21 through the base 10, for example, connected by providing a rubber ring in an interference fit manner. Or according to an embodiment of the present disclosure, referring to fig. 1, 4 and 5, the drill bit limiting device may further include a mounting sleeve 60 for being sleeved on the outer periphery of the fixing portion 21, the base body 10 is mounted on the drill bit housing 20 by being screwed with the mounting sleeve 60, and the inner diameter of the base body 10 is greater than the outer diameter of the rotating portion 22. The installation sleeve 60 can be in interference fit with the periphery of the fixing portion 21, and the base body 10 is in threaded fit with the installation sleeve 60, so that the base body 10 can be conveniently disassembled and assembled. In addition, the mounting sleeve 60 may provide a thickness support between the rotating part 22 and the base 10, that is, the base 10 having an inner diameter larger than the outer diameters of the fixed part 21 and the rotating part 22 may be mounted to the fixed part 21 by the adapter of the mounting sleeve 60, thereby avoiding interference with the rotating part 22 and a drill bit mounted on the rotating part 22.

Referring to fig. 3, the drill bit stopping means may further include a protective pad 70 provided at the front end of the expansion part 40, and the protective pad 70 is constructed in a flexible ring structure so that the drill bit 30 can be extended forward. When the drill 30 drills a hole, the protection pad 70 can protect the surface to be machined when contacting the surface to be machined, and prevent the expansion part from damaging the surface of the workpiece. The material of the protection pad 70 may be rubber or other flexible material.

According to a second aspect of the present disclosure, referring to fig. 1, there is also provided a power drill comprising a drill bit 30, a bit housing 20 for mounting the drill bit 30 and the drill bit stop described above. This electric drill has all beneficial effects of above-mentioned drill bit stop device, and it is no longer repeated here.

The preferred embodiments of the present disclosure are described in detail with reference to the accompanying drawings, however, the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present disclosure within the technical idea of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.

It should be noted that, in the foregoing embodiments, various features described in the above embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, various combinations that are possible in the present disclosure are not described again.

In addition, any combination of various embodiments of the present disclosure may be made, and the same should be considered as the disclosure of the present disclosure, as long as it does not depart from the spirit of the present disclosure.

Claims

1. A drill bit stop device, comprising:

the base body (10) is fixed on the drill bit shell (20) and coaxially sleeved on the periphery of the drill bit (30);

the telescopic part (40) is coaxially arranged at the front end of the base body (10) in a forward and backward moving mode, and a through hole (41) allowing the drill bit (30) to extend forwards is formed at the front end of the telescopic part (40); and

a locking part (50) for locking the telescopic part (40) at least axially on the base body (10).

2. The drill bit limiting device according to claim 1, wherein the telescopic portion (40) is coaxially arranged inside the base body (10), an opening (101) is formed in the base body (10), and the locking portion (50) is configured to pass through the opening (101) to lock the telescopic portion (40).

3. The drill bit stopping device according to claim 2, wherein the opening (101) is formed on opposite sides of the base body (10), and the locking portion (50) is configured to be able to pass through the opening (101) on both sides of the base body (10) to lock on opposite sides of the telescoping portion (40).

4. The bit retainer device as claimed in claim 2, wherein the opening (101) is configured as a long hole extending in an axial direction of the bit (30), the expansion portion (40) has a groove (42) formed on an outer peripheral surface thereof, and the locking portion (50) includes:

a locking pin (51) capable of passing through the elongated hole and protruding into a groove (42), the groove (42) being configured to match a profile of the locking pin (51) such that the locking pin (51) is capable of moving the telescoping portion (40) along the elongated hole;

an external thread (52) formed on an outer surface of the base body (10); and

two nuts (53) each formed with an internal thread matching the external thread (52),

when the locking pin (51) extends into the groove (42), the two nuts (53) can be clamped on two sides of the part of the locking pin (51) extending out of the base body (10) so as to limit the axial movement of the locking pin (51) along the drill bit (30).

5. The drill bit stop device according to claim 4, wherein the base body (10) includes a large diameter section (11) for mounting to the drill bit housing (20) and a small diameter section (12) tapered forward from a front end of the large diameter section (11), the external thread (52) being formed on the small diameter section (12).

6. The drill bit stop device according to claim 4, characterized in that the groove (42) is formed at a position of the telescopic portion (40) near the rear end, and the length of the elongated hole is greater than the length of the telescopic portion (40) in the axial direction of the drill bit (30).

7. Drill bit stop device according to claim 2, characterized in that the opening (101) is configured as a threaded hole and the locking part (50) comprises a threaded element (54) which can be screwed through the opening (101) and which abuts against the telescopic part (40).

8. The drill bit limiting device according to claim 1, wherein the drill bit housing (20) comprises a fixing portion (21) and a rotating portion (22) connected with the drill bit (30), the drill bit limiting device further comprises a mounting sleeve (60) sleeved on the periphery of the fixing portion (21), the base body (10) is mounted on the drill bit housing (20) through screwing with the mounting sleeve (60), and the inner diameter of the base body (10) is larger than the outer diameter of the rotating portion (22).

9. Drill bit stop device according to any of claims 1-8, characterized in that it further comprises a protective pad (70) arranged at the front end of the telescopic part (40), the protective pad (70) being configured as a flexible ring-like structure.

10. A drill comprising a drill bit (30), a bit housing (20) for mounting the drill bit (30) and a bit stop according to any one of claims 1 to 9.