CN214238047U - Drill bit assembly and portable electric drill - Google Patents

Abstract

The utility model discloses a drill bit component, which is used for a portable electric drill and comprises a mounting base, a drill bit structure and at least one connecting unit, wherein the connecting unit comprises at least one transmission element for the rotation of the drill bit structure and is used for dynamically coupling the drill bit structure with a power component of the portable electric drill; the connection unit further comprises at least one latching element arranged for form-locking and/or force-locking connection with the tool head mounting portion of the portable electric drill; the coupling unit is designed such that, when the mounting base is arranged on the tool head mounting and is fastened to the tool head mounting by means of the latching element of the coupling unit, the transmission element of the coupling unit and the power assembly are connected to one another in a rotationally fixed manner; the mounting base is provided with a first through hole for mounting a transmission element; also disclosed is a portable electric drill; the utility model discloses not only can make drill bit assembly and the connection and the dismantlement of tool bit installation department rapid stabilization, still improve drill bit assembly's operating stability.

Description

Drill bit assembly and portable electric drill

Technical Field

The utility model relates to a drill bit technical field especially relates to a drill bit assembly and portable electric drill.

Background

The garden tool ground drill products in the existing market, such as the drill bit assembly, generally have larger overall dimension, and cannot meet the household requirements; moreover, the drill bit piece is generally made of metal products, and a plurality of welding processes are required to be added in the connection of the blade and the main shaft, so that the existing drill bit piece has heavier weight and is inconvenient to store and carry both from the aspects of raw materials and processing processes; in addition, the drill bit assembly is of a single type, and cannot be exchanged with a tool bit mounting part with good universality for products with other functions (tools with functions of grass cutting, circular saw, pruning and the like).

In addition, the function head part of the existing garden tool product, namely the tool head installation part, is characterized in that the upper cover and the lower cover of the two shell parts are used for fixing the working component (the blade component), the operation is complex, the universality is poor, and the operation cannot be realized simultaneously and is connected with a plurality of different function product tools.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problem, the utility model discloses a drill bit assembly through the first gripping member and the first latch fitting piece that set up, not only can make the drill bit assembly who obtains and tool bit installation department high-speed joint, has improved drill bit assembly's operating stability moreover.

In order to achieve the above object, the present invention provides a drill bit assembly for a portable electric drill, the drill bit assembly having a mounting base, a drill bit structure, and at least one connection unit, the connection unit including at least one transmission element for rotation of the drill bit structure, for dynamically coupling the drill bit structure with a power assembly of the portable electric drill; the connection unit further comprising at least one latching element arranged for form-locking and/or force-locking connection with a tool head mounting portion of the portable power drill; the coupling unit is designed such that, when the mounting base is arranged on the tool head mount and is fastened to the tool head mount by means of the latching element of the coupling unit, the transmission element of the coupling unit and the power assembly are connected to one another in a rotationally fixed manner; wherein, be configured with the first through-hole that is used for installing transmission element on the mounting base.

In one embodiment, the latching element comprises a first latch and a second latch, both disposed on the mounting base and non-interfering with each other;

first card latch fitting with second card latch fitting is constructed, works as the mounting base arranges when on the instrument head installation department, first card latch fitting with the cooperation of instrument head installation department joint, second card latch fitting with the cooperation of pegging graft of instrument head installation department, so that the mounting base is fixed on the instrument head installation department.

In one embodiment, the first latch is configured to snap; a rotating part is arranged between the mounting base and the buckle;

the one end pin joint of rotating the piece is in on the buckle, and the other end pin joint is in on the mounting base, works as the buckle winds when rotating the piece and rotating, the buckle can with the portion of bending locking or unblock on the instrument head installation department.

In one embodiment, the second locking element is configured as a limiting hole, and when the mounting base is arranged on the tool head mounting part, the limiting bulge on the tool head mounting part is in plug-in fit with the limiting hole.

In one embodiment, the mounting base is provided with at least a first holding piece and a side frame, and the first holding piece is fixedly arranged on the side frame;

the side frame with between the first card latch fitting and the side frame with setting mutually noninterfere between the second card latch fitting.

In one embodiment, the first gripping member is configured such that when the mounting base is secured to the tool head mounting portion, a central axis of the first gripping member forms a predetermined angle with a central axis of a second gripping member on the tool head mounting portion; the preset angle is greater than 90 degrees and less than or equal to 180 degrees.

In one embodiment, the connection unit further comprises a reducer, an input end of the reducer is dynamically coupled with the transmission element, and an output end of the transmission assembly is detachably connected with the drill bit structure.

In one embodiment, the drill bit structure comprises a blade assembly and a drill bit, both of which are provided as plastic pieces, the blade assembly and the drill bit being detachably connected.

In one embodiment, the blade assembly includes at least a first blade; and

the second blade is fixedly connected to the first blade;

the first blade comprises a first shaft and a first spiral plate arranged on the outer peripheral surface of the first shaft in a surrounding mode; the second blade comprises a second shaft and a second spiral plate arranged on the outer peripheral surface of the second shaft in a surrounding mode;

the blade assembly is configured such that, when the second blade is secured to the first blade, the first and second shafts are coaxially arranged and the first and second helical plates smoothly interface.

In one embodiment, the first blade comprises at least one second boss fixed by a fixing element with a first groove on the second blade;

the second blade at least comprises a second groove, and the second groove is detachably connected with the third protruding part of the drill bit.

The utility model also provides a portable electric drill, which comprises a tool head mounting part and the drill bit assembly; the tool head mounting part at least comprises a second holding piece, and the second holding piece is configured to form a preset angle with the first holding piece on the mounting base when the mounting base of the drill bit assembly is arranged on the tool head mounting part, so that the first holding piece and the second holding piece can be matched for use;

the tool bit mounting portion includes at least one power assembly for rotation of the drill bit for power coupling the tool bit mounting portion with a transmission element of the connection unit;

the tool head mount comprises at least one lock for coupling the catch element to the lock of the tool head mount for fastening the drill head assembly.

In one embodiment, the locking part at least comprises a bending part and a limiting bulge, and the bending part and the limiting bulge are arranged without interference;

the bent part is used for being matched with a first clamping and locking piece of the clamping and locking element in a clamping manner;

the limiting protrusion is used for being matched with the second clamping and locking piece of the clamping and locking element in an inserting mode.

The ground drill bit has the advantages that the ground drill bit disclosed by the utility model can enable the drill bit component and the tool bit mounting part to be connected and detached quickly and stably, and can conveniently disassemble and assemble the drill bit structure on the drill bit component; by the mode, the disassembly performance of the portable electric drill is optimized, the tool bit is convenient to store and improve the selectivity, and when parts are damaged, the maintenance cost is reduced. In addition, the first holding piece and the second holding piece are matched for use, so that the whole machine is more stable in operation.

Drawings

In order to more clearly illustrate the drill bit assembly and the portable electric drill of the present invention, the drawings required for the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and it is obvious to those skilled in the art that other drawings can be obtained according to the drawings without inventive labor.

FIG. 1 is a schematic cross-sectional view of a drill bit assembly;

FIG. 2 is a schematic structural view of a mounting base;

FIG. 3 is an enlarged view of the first latch member coupled to the cover plate;

FIG. 4 is an exploded view of the drill bit assembly;

FIG. 5 is a schematic structural view of the transmission assembly;

FIG. 6 is a schematic view of the exploded structure of the first transmission member and the second transmission member;

FIG. 7 is a schematic view of the construction of the drill bit assembly;

FIG. 8 is a schematic view of the configuration of the bit assembly engaged with a second blade;

figure 9 is a schematic view of a portable electric drill;

FIG. 10 is a schematic structural view of a predetermined angle formed by the first holding member and the second holding member;

wherein the reference numerals in the figures correspond to: 1-mounting a base; 101-a first grip; 102-side frame; 1021-a first opening; 1022 — a second opening portion; 103-a substrate; 104-a second latch; 105-a first via; 2-a transmission element; 3-a shell; 4-a drill bit configuration; 401-a transmission assembly; 410-a reducer; 411-a clutch assembly; 413-a drive shaft; 402-a leaf assembly; 420-a first blade; 4201-a second boss; 4202-a first shaft; 4203-a first spiral plate; 421-a second blade; 4211-first groove; 4212-second groove; 4213-a fastener; 4214-mating surface; 4215-second axis; 4216-a second spiral plate; 403-a drill bit; 430-a third boss; 431-concave surface; 404-a fixation element; 5-a first latch; 6-cover plate; 601-a second via; 602-a first boss; 7-a rotating member; 8-a tool head mounting portion; 801-a second grip; 802-a power assembly; 803-bending part; 804-stop lug.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings.

Example 1:

as shown in fig. 1-4: a drill bit assembly for a portable electric drill, the drill bit assembly having a mounting base 1, a drill bit structure 4, and at least one connection unit comprising at least one transmission element 2 for rotation of the drill bit structure 4 for power coupling of the drill bit structure 4 with a power assembly of the portable electric drill; the connection unit further comprises at least one latching element arranged for form-locking and/or force-locking connection with the tool head mounting portion 8 of the portable electric drill; the connecting unit is designed such that, when the mounting base 1 is arranged on the tool head mount 8 and is fixed on the tool head mount 8 by means of the latching element of the connecting unit, the transmission element 2 and the power assembly of the connecting unit are connected to one another in a rotationally fixed manner, the latching element provided in the present application enables a quick connection of the drill head assembly to the tool head mount by fixing the mounting base 1 on the tool head mount 8, and the provided mounting base 1 makes it possible to increase the operating stability of the drill head assembly.

In the illustrated embodiment, as shown in fig. 1, the latching element (5,104) includes a first latch 5 and a second latch 104, both the first latch 5 and the second latch 104 being disposed on the mounting base 1 without interfering with each other;

the first latch 5 and the second latch 104 are configured such that, when the mounting base 1 is arranged on the tool bit mounting part 8, the first latch 5 is snap-fitted to the tool bit mounting part 8, and the second latch 104 is plug-fitted to the tool bit mounting part 8, so that the mounting base 1 is fixed on the tool bit mounting part 8; carry on spacingly through second latch fitting 104 position between mounting base 1 and the instrument head installation department 8 in this application, fix mounting base 1 on the instrument head installation department through first latch fitting 5, fix mounting base 1 on the instrument head installation department through adopting spacing and joint dual mode, not only convenient and fast and stability are higher.

In the present embodiment, as shown in fig. 2, the second locking member 104 is configured as a limiting hole, and when the mounting base 1 is arranged on the tool bit mounting portion 8, the limiting protrusion 804 on the tool bit mounting portion 8 is inserted and matched with the limiting hole; set second latch fitting 104 to the form in spacing hole in this application for when fixing mounting base 1 and instrument head installation department 8, carry on spacingly to mounting base 1 and instrument head installation department 8, subsequent installation and fixed of being convenient for.

In the embodiment of the present specification, the first latch 5 is configured as a catch as shown in fig. 1, 3 and 4, a rotation member 7 is disposed between the mounting base 1 and the catch,

one end of the rotating part 7 is pivoted on the buckle, the other end of the rotating part 7 is pivoted on the mounting base 1, and when the buckle rotates around the rotating part 7, the buckle can be locked or unlocked with the bending part 803 on the tool head mounting part 8;

specifically, when the buckle rotates around the rotating member 7 in a direction close to the tool head mounting part 8, so that the buckle is in clamping fit with the bending part 803 on the tool head mounting part 8 and then rotates in a direction away from the tool head mounting part 8, the buckle and the bending part 803 are locked;

when the buckle rotates around the rotating part 7 to the direction close to the tool head mounting part 8, after the buckle is unlocked with the bending part 803 on the tool head mounting part 8, and then rotates to the direction far away from the tool head mounting part 8, the buckle is separated from the bending part 803, so that unlocking is realized; this application is through designing into the form of buckle with first latch fitting spare 5 for the buckle when using, can realize the other end and the cooperation of 8 joints of instrument head installation department or throw off with one end rotation mode, and traditional fixed mode can be adopt screw or bolt to fix mounting base 1 and instrument head installation department 8, for traditional fixed mode in this application be connected between mounting base 1 and the instrument head installation department 8 and dismantle convenient and fast more.

In the embodiment of the present specification, the first locking member 5 may be a buckle, one end of which is rotatably connected to the mounting base 1 through a rotating member 7, and the other end of which is a free end;

in other embodiments, first locking element 5 can be directly connected to mounting base 1 in a rotatable manner or can be indirectly rotatable relative to mounting base 1.

As shown in fig. 2, in the embodiment of the present specification, the mounting base 1 includes at least one side frame 102 and a first holding member 101, the first holding member 101 is fixedly disposed on the side frame 102, and the disposition between the side frame 102 and the first latch 5 and the disposition between the side frame 102 and the second latch 104 do not interfere with each other; the side frame 102 provided in the present application can increase the strength of the mounting base and make the connection of the first grip 101 more stable.

In the present embodiment, the side frame 102 includes at least one first opening portion 1021 for disposing the second latch 104 in the first opening portion 1021;

the side frame 102 further includes at least one second opening part 1022 for disposing the first latch 5 in the second opening part 1022.

Specifically, the first opening 1021 and the second opening 1022 may be disposed opposite to each other;

in the present specification embodiment, the first grip 101 and the side frame 102 are integrally molded;

the first grip 101 is configured such that, when the mounting base 1 is arranged on the tool head mounting portion 8, a predetermined angle is formed between the central axis of the first grip 101 and the central axis of the second grip 801 on the tool head mounting portion 8;

specifically, as shown in fig. 10, the angle α is a preset angle; the preset angle is more than 90 degrees and less than or equal to 180 degrees; the angle is predetermine in the first 101 that grips that sets up in this application and with forming between the axis of the second 801 that grips on the axis of the first 101 that grips and the instrument head installation department 8, not only conveniently grips, and can improve the stability of portable electric drill operation when using.

Specifically, the first holding member 101 may be a handle structure, which is convenient to hold during operation.

In the present embodiment, the first latch 5 indirectly rotates with respect to the mounting base 1;

specifically, as shown in fig. 1 and 3, the first latch 5 is indirectly rotatably connected to the mounting base 1 through the cover 6;

as shown in fig. 3, the cover plate 6 at least includes a first protrusion 602 for rotatably connecting with the first latch 5; specifically, in the present embodiment, the first protrusion 602 is rotatably connected to the first locking member 5 via the rotating member 7; specifically, the first locking member 5 is hinged to the first protrusion 602 through the rotating member 7, so that the first locking member 5 can rotate relative to the rotating member 7; adopt in this application to rotate piece 7 and realize that first bellying 602 is connected with the rotation of first latch fitting 5, can guarantee first latch fitting 5 can fasten ground lock joint on portion 803 of bending.

As shown in fig. 1 to 3, in the present embodiment, the cover plate 6 is fixedly provided on the mounting base 1;

specifically, in the embodiment of the present specification, at least one substrate 103 is disposed on the mounting base 1, and the cover plate 6 is fixedly connected to the mounting base through the substrate 103;

specifically, the cover plate 6 may be provided with a screw hole, and the cover plate 6 is fixedly connected to the substrate 103 on the mounting base 1 through a screw or a bolt;

specifically, a hole matched with the screw hole is formed in the substrate 103, and the cover plate 6 is fixedly connected with the substrate 103 through a screw or a bolt.

In the embodiment of the present specification, the mounting base 1 is provided with a first through hole 105 for mounting the transmission element 2; it will be appreciated that the base plate 103 comprises at least one first through hole 105 for power transmission of the transmission element 2, for power coupling of the transmission element 2 with the drill bit structure 4 through the first through hole 105;

the cover plate 6 comprises at least one second through hole 601 for power transmission of the transmission element 2, and the transmission element 2 is in power coupling with the drill bit structure 4 through the second through hole 601;

specifically, the transmission element 2 may be a transmission joint, one end of the transmission joint passes through the first through hole 105 and the second through hole 601 to be dynamically coupled with the drill bit structure 4, and the other end of the transmission joint is dynamically coupled with the tool bit mounting part 8; to enable power transmission between the tool bit mounting portion 8 and the drill bit structure 4.

In other embodiments of the present description, the first latch 5 may also be directly rotatably connected to the mounting base 1;

specifically, the direct rotational connection of the first locking member 5 to the mounting base 1 may include the rotational connection of the first locking member 5 to the side frame 102 of the mounting base 1 through the rotating member 7 or the rotational connection of the first locking member 5 to the base plate 103 of the mounting base 1;

when the first latch 5 is rotatably connected to the side frame 102 of the mounting base 1, the first latch may be rotatably connected to an end of the side frame 102 away from the first grip 101, so that the first latch 5 can rotate relative to the side frame 102 of the mounting base 1.

When the first locking piece 5 is rotatably connected to the base plate 103 of the mounting base 1, the first locking piece 5 may be directly rotatably connected to the side of the base plate 103 near the second opening 1022 through the rotating piece 7, so that the first locking piece 5 can rotate relative to the base plate 103 of the mounting base 1 through the rotating piece 7.

As shown in fig. 2, in the present embodiment, the base plate 103, the first grip 101, and the side frame 102 on the mounting base 1 are integrally molded; the design is convenient for processing and forming the mounting base 1;

in other embodiments of the present disclosure, a through hole may be formed in the bottom of the mounting base 1, so that the substrate 103 is fixed in the through hole.

As shown in fig. 2, in the present embodiment, the first opening 1021 and the first grip 101 of the side frame 102 are respectively located at two opposite sides of the side frame 102, and the second opening 1022 and the first grip 101 of the side frame 102 are located at the same side of the side frame 102; namely, the second locking piece 104 and the first holding piece 101 are respectively positioned at two opposite sides of the side frame 102, and the first locking piece 5 and the first holding piece 101 are positioned at the same side of the side frame 102; this kind of design of this application is convenient for the rotation of mounting base 1 and follow-up first latch fitting 5 and the 8 locks of tool bit installation department on the mounting base 1.

Specifically, the side frame 102 may further include a third opening and a fourth opening, and the third opening and the fourth opening are symmetrically disposed along a central connecting line of the first opening 1021 and the second opening 1022; the present application can increase the stability of the side frame 102 and reduce the overall weight of the mounting base 1 by symmetrically providing the opening portions on the side frame 102.

In other embodiments of the present disclosure, the first opening 1021 of the side frame 102 may be located on the same side of the side frame 102 as the first grip 101, and the second opening 1022 of the side frame 102 and the first grip 101 are located on opposite sides of the side frame 102; that is, the second latch 104 may be located on the same side of the side frame 102 as the first grip 101, and the first latch 5 may be located on opposite sides of the side frame 102 from the first grip 101.

In the embodiment of the present description, as shown in fig. 1, 4 to 6, the connection unit further comprises a transmission assembly 401, the transmission assembly 401 at least comprises a reducer 410, an input end of the reducer 410 is dynamically coupled with the transmission element 2, and an output end of the reducer 410 is detachably connected with the drill bit structure 4;

specifically, as shown in fig. 4, the output end of the decelerator 410 is detachably connected to the drill structure 4 through the transmission shaft 413; specifically, the drill bit structure 4 may be sleeved on the transmission shaft 413 and fixed to the transmission shaft 413 by using a shaft pin;

preferably, the reducer may be a planetary reducer;

specifically, the transmission element 2 may be directly sleeved on the input end of the speed reducer 410 and connected with the input end of the speed reducer 410 in an interference fit manner;

in particular, the transmission element 2, the reducer 410, the transmission shaft 413 and the drill bit assembly 4 may be coaxially rotatable.

In the embodiment of the present specification, the transmission assembly 401 may further include a clutch assembly 411, where the clutch assembly 411 is disposed at the bottom of the reducer 410 and is used for defining a ring gear portion of the planetary reducer;

specifically, at least two first protrusions are arranged on the gear ring portion, at least two second protrusions are arranged at one end, close to the speed reducer 410, of the clutch component 411, and when the first protrusions are in contact with the second protrusions, the second protrusions can block the first protrusions from rotating;

specifically, the speed reducer 410 and the clutch assembly 411 are both fixed on the mounting base 1, and the transmission element 2 penetrates through the substrate 103 on the mounting base 1 and is in power coupling with the input end of the speed reducer 410;

specifically, when the driving torque provided by the driving device of the tool bit mounting portion 8 is greater than or equal to the reaction torque applied to the drill bit assembly by an external object during the actual operation of the drill bit assembly, the clutch 410 and the gear ring portion are both fixed relative to the mounting base 1, and at this time, the first protrusion on the clutch 410 is matched with the second protrusion on the clutch assembly, so that the transmission shaft 413 can be linked with the drill bit structure 4 to operate;

when the driving torque provided by the driving device of the tool bit mounting portion 8 is smaller than the reaction torque applied to the drill bit assembly by an external object during actual operation, the first protrusion on the clutch 410 and the second protrusion on the clutch assembly are disengaged from each other (i.e., the gear ring portion rotates relative to the mounting base 1 and the clutch 410), so that the drill bit structure 4 cannot continue to rotate to avoid mechanical damage.

In the embodiment of the present specification, the clutch assembly 411 and the speed reducer 410 provided in the present application, and the matching relationship between the clutch assembly 411 and the speed reducer 410 belong to the prior art, and the present application is not limited to the use of the clutch assembly 411 and the speed reducer 410, and speed reducers and clutches with other structures may also be used to implement the functions of speed reduction and clutch.

In the embodiment of the present specification, the transmission assembly 401 is sleeved with a housing 3 for accommodating the clutch assembly 411 and the reducer 410; one end of the housing 3 is fixedly connected with the mounting base 1, and specifically, the housing 3 is detachably connected with the substrate 103.

As shown in fig. 4, in the embodiment of the present specification, the drill bit structure 4 includes a blade assembly 402 and a drill bit 403, the blade assembly 402 and the drill bit 403 are both provided as plastic members, and the blade assembly 402 and the drill bit 403 are detachably connected;

specifically, in the illustrated embodiment, as shown in fig. 1 and 4, the blade assembly 402 of the drill bit structure 4 is detachably connected to the transmission shaft 413, specifically, the detachable connection may be achieved by a shaft pin; the blade assembly 402 is fixedly connected with the drill bit 403 at one end close to the drill bit 403; this type of securing may be used to improve the strength and stability of the drill bit structure 4.

Specifically, the blade assembly 402 and the drill bit 403 are both molded by using a plastic material mold; the blade assembly 402 and the drill bit 403 can be made of glass fiber modified plastics, namely PA6-GF30, or other plastics, and the weight of the drill bit structure 4 can be effectively reduced by the blade assembly 402 and the drill bit 403 which are provided with plastic structures.

As shown in fig. 1 and 4, in the present illustrative embodiment, the blade assembly 402 includes at least a first blade 420; and

a second blade 421 fixedly coupled to the first blade 420;

wherein, the first blade 420 comprises a first shaft 4202 and a first spiral plate 4203 surrounding the outer peripheral surface of the first shaft; the second blade 421 includes a second shaft 4215 and a second spiral plate 4216 surrounding an outer circumferential surface of the second shaft 4215;

the blade assembly 402 is configured such that, when the second blade 421 is attached to the first blade 420, the first shaft 4202 and the second shaft 4215 are coaxially arranged and the first spiral plate 4203 smoothly interfaces with the second spiral plate 4216.

Specifically, one end of the first blade 420 is detachably connected with the second blade 421, and the other end is detachably connected with the transmission shaft 413;

one end of the second blade 421 away from the first blade 420 is fixedly connected with the drill bit 403;

specifically, as shown in fig. 4, a first spigot engaged with the second spiral plate 4216 is disposed on a side of the first spiral plate 4203 close to the second spiral plate 4216, and a second spigot engaged with the first spigot is disposed on a side of the second spiral plate 4216 close to the first spiral plate 4203, and both the first spigot and the second spigot may be in a mortise and tenon joint structure, so that when the first spiral plate 4203 and the second spiral plate 4216 are combined together, a joint between the first and second spiral plates 4203 and 4216 is smoother, and a connection between the first and second spiral plates is more stable.

Specifically, the thicknesses of the first spiral plate 4203 and the second spiral plate 4216 are not specifically limited in this application, and specifically, the thickness of the blade may be increased or decreased according to the actual use requirement, so as to improve the versatility of the blade assembly.

Specifically, the width of the first and second spiral plates 4203 and 4216, i.e., the outer diameter of the blade assembly 402, may be 50-150 mm; the depth of action of the bit structure 4, i.e. the overall depth of the blade assembly 402 combined with the bit 403, may be 50-500 mm;

preferably, the outer diameter of the vane assembly 402 in the present application may be 75 mm; the depth of action of the bit structure 4 may be 200 mm; this application drill bit structure 4 is not only with low costs, light in weight, and small and exquisite convenience, and more importantly is through the intensity that increases blade subassembly 402 and reduce drill bit structure 4's size for sufficient working strength can be guaranteed at the during operation to drill bit structure 4.

As shown in fig. 4, in the present embodiment, the first blade 420 comprises at least one second boss 4201, the second boss 4201 is configured to be fixed with the first groove 4211 on the second blade 421 by the fixing element 404;

the second blade 421 comprises at least one second groove 4212, and the second groove 4212 is used for being detachably connected with the third boss 430 of the drill bit 403;

the first groove 4211 is fixedly inserted into the second boss 4201;

specifically, the second boss 4201 is provided with a first surface for applying a pushing force to the first groove 4211, and the first groove 4211 is also provided with a second surface for receiving the pushing force;

a first surface of the first groove 4211 is provided with a hole matched with one end of the fixing element 404; one end of the fixing element 404 is inserted into a hole formed in the first surface, and the other end is fixed on the second surface in the first groove 4211 through a fixing piece 4213; the intensity and the stability of blade subassembly can be improved to the tenon fourth of the twelve earthly branches fixed mode that this application adopted first recess 4211 and second bellying 4201 to peg graft.

Specifically, a matching portion matched with the second protrusion 4201 is further provided at an end of the second blade 421 where the first groove 4211 is located; the same first blade 420 is provided with a notch corresponding to the matching part; the design facilitates the assembly of the first blade 420 and the second blade 421, and improves the strength of the blade assembly 402;

specifically, the sum of the height of the fitting portion and the height of the second protrusion 4201 may be used as the fitting depth of the first blade 420 and the second blade 421; the matching depth can be adjusted according to the structural shape of the second bulge and the size of the blade;

preferably, the fitting depth of the first blade 420 and the second blade 421 may be 18 mm;

preferably, the second protrusion 4201 may be a hexagonal stud structure, and the specific structure of the first groove 4211 matches with the structure of the second protrusion 4201, i.e. a hexagonal hollow groove.

Specifically, the fixing element 404 may be a screw, and the first groove 4211 and the second boss 4201 are fixed by the screw; this application adopts the fixed mode of multiple cooperation to fix first blade 420 and second blade 421 not only can increase the stability that first blade 420 and second blade 421 are connected, and blade subassembly 402's structural strength is big.

As shown in fig. 1, 4 and 7, a second groove 4212 is formed at one end of the second blade 421 away from the first groove 4211; a third boss 430 is arranged on the drill bit 403, and the third boss 430 is matched and fixed with the second groove 4212;

specifically, as shown in fig. 7 and 8, in the embodiment of the present disclosure, a concave surface 431 is provided on the third protruding portion 430 on the drill 403, and a matching surface 4214 matching with the concave surface 431 is provided in the second groove 4212 matching with the third protruding portion 430; the drill bit 403 is in mortise-tenon joint with the second groove 4212 and the matching surface 4214 of the second blade 421 through the third protruding portion 430 and the concave surface 431, and after the third protruding portion 430 is inserted into the second groove 4212, the drill bit 403 and the second blade 421 are fixed by a fastener;

preferably, the fastener may be a pin.

Example 2:

the embodiment of the utility model provides another kind of drill bit assembly is still provided for portable electric drill, and drill bit assembly has mounting base 1, drill bit structure 4, and at least one connecting unit, and the connecting unit includes at least one transmission element 2 for the rotation of drill bit structure 4, is used for with the power component power coupling of portable electric drill of drill bit structure 4; the connection unit further comprises at least one latching element 5,104 arranged for form-locking and/or force-locking connection with the tool head mounting portion 8 of the portable electric drill; the connecting unit is designed such that, when the mounting base 1 is arranged on the tool head mounting 8 and is fixed on the tool head mounting 8 by means of the latching elements 5,104 of the connecting unit, the transmission element 2 of the connecting unit and the power assembly are connected to one another in a rotationally fixed manner, the latching elements provided in the present application enable a quick connection of the drill head assembly to the tool head mounting by fixing the mounting base 1 on the tool head mounting 8, and the provided mounting base makes it possible to increase the operating stability of the drill head assembly.

In the embodiment of the present specification, as shown in fig. 1, the locking elements 5,104 include a first locking piece 5 and a second locking piece 104, and the first locking piece 5 and the second locking piece 104 are both disposed on the mounting base 1 without interfering with each other;

the first and second latches 5 and 104 are configured such that, when the mounting base 1 is arranged on the tool bit mounting part 8, both the first and second latches 5 and 104 are snap-fitted with the tool bit mounting part 8 to fix the mounting base 1 on the tool bit mounting part 8;

in the present embodiment, the first and second latches 5 and 104 are each configured as a catch, and the rotation member 7 is disposed between the mounting base 1 and the catch;

one end of the rotating part 7 is pivoted on the buckle, the other end of the rotating part 7 is pivoted on the mounting base 1, and when the buckle rotates around the rotating part 7, the buckle can be locked or unlocked with the bending part 803 on the tool head mounting part 8;

the buckle is rotationally connected with the mounting base 1 through the rotating piece 7, and when the buckle rotates towards the direction close to the tool head mounting part 8, the buckle is in clamping fit with the bending part 803 on the tool head mounting part 8;

in another embodiment of the present specification, the first latch 5 is configured as a catch, and the rotation member 7 is disposed between the mounting base 1 and the catch;

one end of the rotating part 7 is pivoted on the buckle, the other end of the rotating part 7 is pivoted on the mounting base 1, and when the buckle rotates around the rotating part 7, the buckle can be locked or unlocked with the bending part 803 on the tool head mounting part 8;

the second latch 104 is configured as a through hole and a lock catch, and when the mounting base 1 is arranged on the tool bit mounting part 8, the plug pin on the tool bit mounting part 8 is inserted into the through hole and fixed by the lock catch.

In the present embodiment, the drive element 2 may be a drive shaft for power coupling the drill bit structure 4 with a power assembly of a portable electric drill.

In another embodiment of the present description, the transmission element 2 may also be a rigid or flexible transmission belt.

Example 3:

as shown in fig. 9, an embodiment of the present invention provides a portable electric drill comprising a tool bit mounting portion 8 and a drill bit assembly of embodiment 1 or 2; the tool head mounting part 8 at least comprises a second holding piece 801, and the second holding piece 801 is configured such that when the mounting base 1 of the drill bit assembly is arranged on the tool head mounting part 8, a preset angle is formed between the second holding piece 801 and the first holding piece 101 on the mounting base 1, so that the first holding piece 101 and the second holding piece 801 can be matched for use;

the tool bit mounting part 8 comprises at least one power assembly 802 for power coupling the tool bit mounting part 8 with the transmission element 2 of the connection unit for rotation of the drill bit structure 4;

the tool bit mounting part 8 comprises at least one lock for the fastening of the drill bit assembly for the coupling of the latching element 5,104 with the lock of the tool bit mounting part 8; portable electric drill in this application not only light in weight, and small and exquisite convenience, more importantly can guarantee sufficient working strength.

Specifically, the second holding part 801 may be a handle, and a preset angle is formed between a central axis of the second holding part 801 and a central axis of the first holding part 101 on the mounting base 1; the preset angle is greater than 90 degrees and less than or equal to 180 degrees.

As shown in fig. 10, the angle α is a predetermined angle; preferably, the preset angle may be 180 °; this design facilitates stability of operation during use.

Specifically, the power assembly 802 may include a driving main body and a driving head connecting the driving main body with the transmission member 2;

the driving main machine realizes power transmission with the drill bit through the driving head and the transmission element 2.

Specifically, the bending part 803 is bent in a direction away from the drill bit assembly;

in the embodiment of the present specification, the locking portion at least includes a bending portion 803 and a limiting protrusion 804, and the bending portion 803 and the limiting protrusion 804 are arranged without interfering with each other;

the bent portion 803 is used for snap-fitting with the first latch 5 of the latch element 5,104;

the limiting projection 804 is designed to engage with the second detent element 104 of the detent element 5,104.

The method for assembling and disassembling the portable electric drill comprises the following steps:

specifically, when the portable electric drill is assembled, the limiting protrusion 804 on the tool bit mounting portion 8 is inserted into the second locking piece 104 of the drill bit assembly, the transmission element 2 of the drill bit assembly is rotationally locked with the driving head of the power assembly 802 on the tool bit mounting portion 8 (here, slightly rotationally), the free end of the first locking piece 5 is rotated to the bending portion 803 on the tool bit mounting portion 8 close to the tool bit mounting portion 8, and the first locking piece 5 is pressed to enable the first locking piece 5 to be fixedly clamped with the bending portion 803 on the tool bit mounting portion 8, so that the tool bit mounting portion 8 and the drill bit assembly can be quickly connected;

specifically, when the portable electric drill of this application was dismantled, to keeping away from the first block spare 5 of the direction pulling of the portion 803 of bending on the tool bit installation department 8 for first block spare 5 breaks away from with the portion 803 of bending, and reverse rotation tool bit installation department 8 makes transmission element 2 and driving head break away from, extracts spacing arch 804 from second block spare 104 again, can separate tool bit installation department 8 and drill bit assembly, accomplishes the pine and takes off.

The utility model discloses a portable electric drill not only can make drill bit assembly and 8 fast and stable's of instrument head installation department be connected and dismantle, and the first gripping member 101 that sets up moreover makes the complete machine operation more stable.

The above disclosure is only a preferred embodiment of the present invention, and certainly should not be taken as limiting the scope of the invention, which is defined by the claims and their equivalents.

Claims (12)

1. A drill bit assembly for a portable electric drill, characterized in that: the drill bit assembly having a mounting base (1), a drill bit structure (4), and at least one connection unit comprising at least one transmission element (2) for rotation of the drill bit structure (4) for power coupling of the drill bit structure (4) with a power assembly of the portable electric drill; the connection unit further comprises at least one latching element (5,104) arranged for form-and/or force-locking connection with a tool head mounting portion (8) of the portable electric drill; the connection unit is designed in such a way that, when the mounting base (1) is arranged on the tool head mounting (8) and is fixed on the tool head mounting (8) by means of the latching elements (5,104) of the connection unit, the transmission element (2) of the connection unit and the power assembly are connected to one another in a relatively rotatable manner; wherein the mounting base (1) is provided with a first through hole (105) for mounting the transmission element (2).

2. The drill bit assembly of claim 1, wherein: the latching element (5,104) comprises a first latching element (5) and a second latching element (104), the first latching element (5) and the second latching element (104) being arranged on the mounting base (1) without interfering with each other;

first card latch fitting (5) with second card latch fitting (104) is constructed into, works as mounting base (1) is arranged when instrument head installation department (8) is gone up, first card latch fitting (5) with instrument head installation department (8) joint cooperation, second card latch fitting (104) with the cooperation is pegged graft to instrument head installation department (8), so that mounting base (1) is fixed on instrument head installation department (8).

3. The drill bit assembly of claim 2, wherein: the first catch (5) is configured as a catch; a rotating part (7) is arranged between the mounting base (1) and the buckle;

one end of the rotating part (7) is pivoted on the buckle, and the other end of the rotating part is pivoted on the mounting base (1); when the buckle winds the rotation piece (7) rotates and the rotation piece (7) winds the mounting base (1) rotates, the buckle can be locked or unlocked with a bending part (803) on the tool head mounting part (8).

4. The drill bit assembly of claim 2, wherein: the second locking piece (104) is constructed into a limiting hole, and when the mounting base (1) is arranged on the tool head mounting part (8), a limiting bulge (804) on the tool head mounting part (8) is in plug-in fit with the limiting hole.

5. The drill bit assembly of claim 2, wherein: the mounting base (1) is at least provided with a first holding piece (101) and a side frame (102), and the first holding piece (101) is fixedly arranged on the side frame (102);

the arrangement between the side frame (102) and the first latch (5) and between the side frame (102) and the second latch (104) do not interfere with each other.

6. The drill bit assembly of claim 5, wherein: the first holding piece (101) is configured such that when the mounting base (1) is fixedly connected to the tool head mounting part (8), a preset angle is formed between a central axis of the first holding piece (101) and a central axis of a second holding piece (801) on the tool head mounting part (8); the preset angle is greater than 90 degrees and less than or equal to 180 degrees.

7. The drill bit assembly of claim 1, wherein: the connecting unit further comprises a speed reducer (410), wherein the input end of the speed reducer (410) is in power coupling with the transmission element (2), and the output end of the speed reducer (410) is detachably connected with the drill bit structure (4).

8. The drill bit assembly of claim 1, wherein: the drill bit structure (4) comprises a blade assembly (402) and a drill bit (403), wherein the blade assembly (402) and the drill bit (403) are both arranged to be plastic parts, and the blade assembly (402) and the drill bit (403) are detachably connected.

9. The drill bit assembly of claim 8, wherein: the blade assembly (402) comprises at least a first blade (420); and

a second blade (421) fixedly connected to the first blade (420);

wherein the first blade (420) comprises a first shaft (4202) and a first spiral plate (4203) arranged around the outer circumferential surface of the first shaft; the second blade (421) comprises a second shaft (4215) and a second spiral plate (4216) arranged on the outer peripheral surface of the second shaft in a surrounding mode;

the blade assembly (402) is configured such that, when the second blade (421) is attached to the first blade (420), the first shaft (4202) and the second shaft (4215) are coaxially arranged and the first helical plate (4203) smoothly interfaces with the second helical plate (4216).

10. The drill bit assembly of claim 9, wherein: -said first blade (420) comprises at least one second boss (4201), said second boss (4201) being fixed to a first groove (4211) on said second blade (421) by means of a fixing element (404);

the second blade (421) comprises at least one second groove (4212), and the second groove (4212) is detachably connected with the third boss (430) of the drill bit (403).

11. A portable electric drill is characterized in that: comprising a tool head mounting portion (8) and a drill bit assembly according to claim 1; the tool head mounting part (8) at least comprises a second holding piece (801); the second gripping element (801) is configured to form a preset angle between the second gripping element (801) and the first gripping element (101) on the mounting base (1) when the mounting base (1) of the drill bit assembly is arranged on the tool head mounting part (8), so that the first gripping element (101) and the second gripping element (801) are matched for use;

the tool head mounting part (8) comprises at least one power assembly (802) for the rotation of the drill head structure (4) for power coupling the tool head mounting part (8) with a transmission element (2) of the connection unit;

the tool head mounting (8) comprises at least one locking portion for the fastening of the drill head assembly, the locking portion being used for positive locking coupling with the locking element (5,104).

12. The portable electric drill of claim 11 wherein: the locking part at least comprises a bending part (803) and a limiting protrusion (804), and the bending part (803) and the limiting protrusion (804) are arranged without interfering with each other;

the bent part (803) is used for being in clamping fit with a first clamping and locking piece (5) of the clamping and locking element (5,104);

the limiting projection (804) is used for being matched with a second locking piece (104) of the locking element (5,104) in a plugging mode.

Images