CN109333463B - Electric tool with dustproof function - Google Patents
Electric tool with dustproof function Download PDFInfo
- Publication number
- CN109333463B CN109333463B CN201811401291.XA CN201811401291A CN109333463B CN 109333463 B CN109333463 B CN 109333463B CN 201811401291 A CN201811401291 A CN 201811401291A CN 109333463 B CN109333463 B CN 109333463B
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- CN
- China
- Prior art keywords
- movable cover
- shell
- matched
- heat dissipation
- hole
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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- 230000017525 heat dissipation Effects 0.000 claims abstract description 44
- 239000000428 dust Substances 0.000 claims abstract description 28
- 230000000694 effects Effects 0.000 claims abstract description 16
- 230000002265 prevention Effects 0.000 claims description 14
- 230000000670 limiting effect Effects 0.000 claims description 8
- 230000000149 penetrating effect Effects 0.000 claims description 5
- 238000007789 sealing Methods 0.000 claims description 4
- 230000002035 prolonged effect Effects 0.000 abstract description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- 230000009471 action Effects 0.000 description 6
- 238000009434 installation Methods 0.000 description 6
- 229910052742 iron Inorganic materials 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25F—COMBINATION OR MULTI-PURPOSE TOOLS NOT OTHERWISE PROVIDED FOR; DETAILS OR COMPONENTS OF PORTABLE POWER-DRIVEN TOOLS NOT PARTICULARLY RELATED TO THE OPERATIONS PERFORMED AND NOT OTHERWISE PROVIDED FOR
- B25F5/00—Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for
- B25F5/02—Construction of casings, bodies or handles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25F—COMBINATION OR MULTI-PURPOSE TOOLS NOT OTHERWISE PROVIDED FOR; DETAILS OR COMPONENTS OF PORTABLE POWER-DRIVEN TOOLS NOT PARTICULARLY RELATED TO THE OPERATIONS PERFORMED AND NOT OTHERWISE PROVIDED FOR
- B25F5/00—Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for
- B25F5/008—Cooling means
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Casings For Electric Apparatus (AREA)
- Grinding-Machine Dressing And Accessory Apparatuses (AREA)
Abstract
The invention relates to an electric tool with a dustproof effect, which comprises a shell, wherein a motor is arranged in the shell, a plurality of heat dissipation holes are formed in the position, corresponding to the motor, of the shell, the shell is coated with a movable cover matched with the shape of the rear end of the shell and the shape of a handle, the movable cover is elastically matched with the shell and can elastically move relative to the shell, auxiliary holes matched with the shape and the number of the heat dissipation holes are formed in the movable cover, the heat dissipation holes and the auxiliary holes are staggered from front to back in a natural state, and the heat dissipation holes are closed; in the invention, the movable cover matched with the shapes of the rear end of the shell and the handle is matched with the dustproof net cover, so that when the electric tool is used, the electric tool can radiate heat and filter dust, the service life is prolonged, and when the electric tool is not used, the movable cover elastically resets to prevent the dust from entering the shell.
Description
Technical Field
The invention relates to the technical field of electric tools, in particular to an electric tool with a dustproof function.
Background
Electric tool is mainly through motor drive when using, the motor sets up inside the electric tool casing, circumference at the motor position on the casing sets up the air outlet, the inside and outside air exchange of mainly used electric tool casing, thereby give off the heat with electric tool when using, in order to prevent that the motor from overheating and causing the damage, but above-mentioned structure also has certain problem, the setting of air outlet has played the radiating effect, but also make the outside dust of casing get into inside the casing through the air outlet very easily, when the dust is when the casing accumulation is too much, cause the harm to electric tool easily, influence its performance, and reduce electric tool's life.
Disclosure of Invention
In view of the above-mentioned current state of the art, the present invention provides an electric tool with dustproof function, which can dissipate heat and prevent dust.
The technical scheme adopted by the invention for solving the technical problems is as follows: an electric tool with a dustproof function comprises a shell, wherein a motor is arranged in the shell, a plurality of heat dissipation holes are formed in the position, corresponding to the motor, of the shell, a movable cover matched with the rear end of the shell and the shape of a handle is wrapped on the shell, the movable cover is elastically matched with the shell and can elastically move relative to the shell, auxiliary holes matched with the heat dissipation holes in shape and number are formed in the movable cover, the heat dissipation holes and the auxiliary holes are staggered back and forth in a natural state, and the heat dissipation holes are closed; when the movable cover is in use, the heat dissipation holes are communicated with the auxiliary holes to exchange air inside and outside the shell for heat dissipation, and the positions, corresponding to the auxiliary holes, of the movable cover are provided with dustproof net covers.
Furthermore, a clamping groove is convexly formed in the front end of the auxiliary hole in the outer wall of the movable cover, an external thread is arranged at the rear end of the auxiliary hole in the outer wall of the movable cover, one end of the dustproof net cover is matched with the clamping groove, and an internal thread matched with the external thread is arranged at the other end of the dustproof net cover.
Furthermore, a sealing washer is arranged at the matching position of the dustproof mesh enclosure and the clamping groove.
Furthermore, a connecting column is convexly arranged at the center of the rear end of the shell, a connecting hole for the connecting column to penetrate through is formed in the movable cover, the end part of the connecting column penetrates through the connecting hole and is exposed outside the movable cover, and an adjusting nut for limiting the movable cover is screwed on the end part of the connecting column.
Further, the connecting column comprises a smooth section and a thread section matched with the adjusting nut, and the inner wall of the connecting hole is smoothly arranged.
Furthermore, at least two first mounting grooves are convexly arranged at the rear end of the shell, second mounting grooves corresponding to the first mounting grooves in number and position are convexly arranged in the movable cover, and springs are clamped between the first mounting grooves and the second mounting grooves.
Furthermore, a first salient point of a positioning spring is arranged in the first mounting groove, and a second salient point of the positioning spring is arranged in the second mounting groove.
Furthermore, a through hole penetrating through the movable cover is formed in the second salient point.
Furthermore, an arc hole penetrating through the movable cover is formed in the bottom of the second mounting groove in the circumferential direction of the second salient point.
Furthermore, the lower end of the movable cover is hinged with a guide rod, the lower end of the handle part of the shell extends to form a guide groove matched with the guide rod, and a roller is arranged at the contact end of the guide rod and the guide groove.
Compared with the prior art, the invention has the advantages that: according to the invention, the movable cover matched with the shapes of the rear end of the shell and the handle part is arranged, when the electric tool is used, the movable cover can be pushed towards the head direction of the electric tool by holding the handle part by a user, so that the auxiliary hole on the movable cover is communicated with the heat dissipation hole on the shell, and the heat dissipation is realized; when the electric tool is not used, the movable cover is elastically reset, so that the auxiliary hole on the movable cover is staggered with the heat dissipation holes, the movable cover closes the heat dissipation holes, the shell closes the auxiliary holes, thereby preventing dust from entering the shell, and prolonging the service life of the electric tool, the design of the movable cover can drive through the holding action of the handle part, the error of forgetting to open the heat dissipation holes when the electric tool works can not occur, and the movable cover can automatically close the heat dissipation holes through elastic reset when not used, thereby playing a role of dust prevention, not only no additional operation steps are added, but also the use is simple and convenient, and the error of forgetting to open or close the heat dissipation holes can not occur, in addition, the dust prevention mesh cover can play a role of dust prevention by arranging the dust prevention mesh cover on the movable cover, when the auxiliary hole on the movable cover is communicated with the, so that the electric tool can prevent dust in working and non-working, and the service life of the electric tool is prolonged.
Drawings
FIG. 1 is a schematic view of the structure of the present invention in its natural state;
FIG. 2 is a schematic view of a dust guard according to the present invention;
FIG. 3 is a schematic structural view of the present invention in use;
FIG. 4 is a rear view of the removable cover of the present invention;
FIG. 5 is a schematic view of the guide bar of the present invention in an installed condition;
as shown in the figure, 1 casing, 2 louvres, 3 movable covers, 4 auxiliary holes, 5 spliced poles, 6 connecting holes, 7 adjusting nuts, 8 first mounting grooves, 9 second mounting grooves, 10 springs, 11 through holes, 12 arc holes, 13 guide rods, 14 guide grooves, 15 rollers, 16 check blocks, 17 handle parts, 18 dustproof mesh enclosures, 19 clamping grooves and 20 sealing gaskets.
Detailed Description
As shown in fig. 1-5, an electric tool with a dustproof function comprises a housing 1, a motor is arranged in the housing 1, a plurality of heat dissipation holes 2 are formed in the housing 1 at positions corresponding to the motor, a movable cover 3 matched with the rear end of the housing 1 and a handle part 17 in shape is coated on the housing 1, the movable cover 3 is elastically matched with the housing 1 and can elastically move relative to the housing 1, auxiliary holes 4 matched with the heat dissipation holes 2 in shape and quantity are formed in the movable cover 3, the heat dissipation holes 2 and the auxiliary holes 4 are staggered back and forth in a natural state, and the heat dissipation holes 2 are closed; in the use state, the heat dissipation holes 2 are communicated with the auxiliary holes 4 for heat exchange between the inside and the outside of the shell 1, and the movable cover 3 is provided with a dust-proof net cover 18 at the position corresponding to the auxiliary holes 4.
According to the invention, the movable cover 3 matched with the rear end of the shell 1 and the handle part 17 in shape is arranged, when the electric tool is used, the movable cover 3 can be pushed towards the head direction of the electric tool by holding the handle part 17 with a user, so that the auxiliary holes 4 on the movable cover 3 are communicated with the heat dissipation holes 2 on the shell 1, and heat dissipation is realized; when the electric tool is not used, the movable cover 3 is elastically reset, so that the auxiliary hole 4 on the movable cover 3 is staggered with the heat dissipation hole 2, the heat dissipation hole 2 is closed by the movable cover 3, the auxiliary hole 4 is closed by the shell 1, thereby preventing dust from entering the shell 1, prolonging the service life of the electric tool, the movable cover 3 is designed, the error of forgetting to open the heat dissipation hole 2 when the electric tool works can not occur through the holding action drive of the handle part 17, the movable cover 3 can automatically close the heat dissipation hole 2 through elastic reset when not used, thereby playing a dustproof role, not only adding additional operation steps, but also having simple and convenient use, and avoiding the error of forgetting to open or close the heat dissipation hole 2, in addition, the distance L from the rear side surface of the handle part 17 to the inner side surface of the movable cover 3 is the displacement of the elastic movement of the movable cover 3, when the common electric tool is used, the operator, the invention adopts the movable cover 3 which is matched with the shape of the rear end of the shell 1 and the handle part 17, so that an operator can drive the movable cover 3 to push towards the head of the electric tool according to the original operation action when using the electric tool, so that the auxiliary hole 4 on the movable cover 3 is communicated with the heat dissipation hole 2 on the shell 1, thereby realizing heat dissipation, when the operator looses the hand, the electric tool stops working, the movable cover 3 elastically resets to close the heat dissipation hole 4, thereby playing a role of dust prevention, under the condition of not increasing additional operation, the invention realizes the functions of heat dissipation and dust prevention of the electric tool, the operation is simple and convenient, in addition, the dust prevention mesh cover 18 is arranged on the movable cover 3, when the auxiliary hole 4 on the movable cover 3 is communicated with the heat dissipation hole 2 on the shell 1, the dust prevention mesh cover 18 can play a role of dust prevention, thereby preventing the dust from entering the shell 1 when the electric tool is used, the service life of the device is prolonged.
As preferred, protruding draw-in groove 19 that is equipped with of front end department at auxiliary hole 4 on the outer wall of movable cover 3, be equipped with the external screw thread in the rear end department of auxiliary hole 4 on the outer wall of this movable cover 3, the one end and the draw-in groove 19 cooperation of dustproof screen panel 18, the other end be equipped with external screw thread fit's internal thread, dustproof screen panel 18 can dismantle with movable cover 3 through screw-thread fit and be connected, conveniently dismantle the washing, change dustproof screen panel, in addition, the one end of dustproof screen panel 18 is pegged graft with draw-in groove 19 on the movable cover 3, the other end and the 3 threaded connection of movable cover, guarantee that the dust is difficult for getting into casing 1 from the both ends junction of.
Preferably, a sealing washer 20 is arranged at the matching position of the dustproof mesh enclosure 18 and the clamping groove 19, so that dust is prevented from entering the shell 1 from the connecting gap, and the dustproof effect is further improved.
Preferably, a connecting column 5 is convexly arranged at the center of the rear end of the shell 1, a connecting hole 6 for the connecting column 5 to penetrate through is formed in the movable cover 3, the end of the connecting column 5 penetrates through the connecting hole 6 and is exposed outside the movable cover 3, an adjusting nut 7 for limiting the movable cover 3 is screwed at the end of the connecting column 5, the distance between the movable cover 3 and the shell 1 can be adjusted through the adjusting nut 7, namely the elastic resetting distance of the movable cover 3, the adjusting nut 7 is further used for limiting the movable cover 3 to be separated from the shell 1, and when the movable cover 3 is elastically reset, the adjusting nut 7 plays a role in stopping and limiting.
Preferably, the connecting column 5 comprises a smooth section and a thread section matched with the adjusting nut 7, the inner wall of the connecting hole 6 is smoothly arranged, and the connecting column 5 is divided into the smooth section and the thread section, so that the connecting column 5 is matched with the connecting hole 6 with the smooth inner wall on the one hand, the movable cover 3 can smoothly slide along the connecting column 5, the heat dissipation holes 2 are opened and closed, and the movable cover 3 is matched with the adjusting nut 7 on the other hand to adjust the installation position of the movable cover 3.
As preferred, the protruding at least two first mounting grooves 8 that are equipped with of 1 rear end of casing, protruding second mounting groove 9 corresponding with first mounting groove 8 quantity and position that is equipped with in the activity cover 3, the joint has spring 10 between first mounting groove 8 and the second mounting groove 9 for keep elastic fit between activity cover 3 and the casing 1, under no exogenic action, spring 10 resets and can pull open the distance between activity cover 3 and the casing 1, thereby close louvre 2, play dustproof effect, and first mounting groove 8, setting up of second mounting groove 9 can play limiting displacement to spring 10, prevent that spring 10 from shifting, influence the reseing of activity cover 3.
Preferably, a first salient point of a positioning spring 10 is arranged in the first mounting groove 8, a second salient point of the positioning spring 10 is arranged in the second mounting groove 9, and the first salient point and the second salient point are convenient for mounting the spring 10.
Preferably, be equipped with the through-hole 11 that runs through movable cover 3 on the second bump, thereby the setting of this through-hole 11 can supply thin iron wire to penetrate when installing spring 10 and pack into second mounting groove 9 to auxiliary spring 10, because when movable cover 3 cup jointed with casing 1, inside spring 10 is blind dress, takes place the installation dislocation easily, and the thin iron wire can be inserted in advance in the setting of this through-hole 11 and the spring 10 is worn on thin iron wire, plays the direction auxiliary action during the installation, improves the installation effectiveness.
Preferably, the bottom of the second mounting groove 9 is provided with an arc hole 12 penetrating through the movable cover 3 in the circumferential direction of the second salient point, the arc hole 12 may be two half arc holes, three third arc holes, or four quarter arc holes, the arrangement of the arc hole 12 may be used to observe the mounting condition of the inner spring 10, and if the spring 10 is not mounted in place, the inner spring needs to be mounted again.
Preferably, the lower end of the movable cover 3 is hinged with a guide rod 13, the lower end of the handle portion 17 of the housing 1 extends to form a guide groove 14 matched with the guide rod 13, a roller 15 is arranged at the end, contacted with the guide groove 14, of the guide rod 13, the guide rod 13 is matched with the guide groove 14, a guide auxiliary effect is achieved when the movable cover 3 slides, the roller 15 can reduce friction between the guide rod 13 and the guide groove 14, so that the movable cover 3 can slide smoothly, in addition, the guide groove 14 achieves a limiting effect on the guide rod 13 and limits the movable cover 3 together with the adjusting nut 7, the movable cover 3 is prevented from being separated from the housing 1 when the movable cover 3 elastically resets, and the two are matched and limited more stably.
Preferably, a stopper 16 for limiting the rotation of the guide rod 13 extends from the lower end of the movable cover 3, the lower edge of the stopper 16 is flush with the upper edge of the guide groove 14, so that when the movable cover 3 is installed, the lower end of the movable cover 3 can slide into the range of the guide groove 14 without hindrance, and the stopper 16 is arranged to limit the rotation of the guide rod 13 towards the head of the electric tool, so that the lower end of the guide rod 13 is kept in contact with the bottom surface of the guide groove 14 when the movable cover 3 slides.
Preferably, the upper edge of the guide groove 14 is provided with a circular arc guide angle, so that the guide rod 13 is guided into the guide groove 14 conveniently and is prevented from being scratched.
When the electric tool is used, an operator holds the handle part 17 of the electric tool, and simultaneously holds the lower part of the movable cover 3, and drives the movable cover 3 to slide towards the head of the electric tool, so that the heat dissipation holes 2 on the shell 1 are communicated with the auxiliary holes 4 on the movable cover 3, heat dissipation can be realized when the motor works, when the electric tool is not used, the handle part 17 is loosened by the hand of the operator, under the condition of no external force, the movable cover 3 is reset through the spring 10, the rear end of the movable cover 3 is abutted against the adjusting nut 7, the guide rod 13 at the lower end of the movable cover 3 is abutted against the wall of the guide groove 14, the auxiliary holes 4 on the movable cover 3 are staggered with the heat dissipation holes 2, the heat dissipation holes 2 are closed by the movable cover 3, the auxiliary holes 4 are closed by the shell 1, thereby preventing dust from entering the shell 1, the service life of the electric tool is prolonged, and the dustproof mesh cover 18 on the movable cover 3 can filter, prevent in the dust gets into casing 1, further improve dustproof effect, when electric tool does not use, can twist off dustproof screen panel 18 and wash, change, high durability and convenient use, in addition, when activity cover 3 was installed, spliced pole 5 passes connecting hole 6 and screws up spacingly through adjusting nut 7, guide arm 13 of activity cover 3 lower extreme turns to horizontal position to electric tool rear portion direction, then promote activity cover 3 and remove to electric tool head direction, make 3 lower extremes of activity cover slide to 14 regional tops of guide slot, in 13 whole slideings into 14 regions of guide slot to the guide arm, guide arm 13 rotates vertical position under the action of gravity, then cancel thrust, activity cover 3 removes to electric tool rear portion direction, it offsets with 14 walls of guide slot to the guide arm 13, accomplish the installation, the installation is simple, need not with the help of appurtenance.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those skilled in the art that various changes in the embodiments and modifications thereof may be made, and equivalents may be substituted for elements thereof; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (8)
1. An electric tool with a dustproof effect comprises a shell (1), wherein a motor is arranged in the shell (1), and is characterized in that a plurality of heat dissipation holes (2) are formed in the position, corresponding to the motor, of the shell (1), a movable cover (3) matched with the rear end of the shell (1) and the shape of a handle part (17) is coated on the shell (1), the movable cover (3) is elastically matched with the shell (1) and can elastically move relative to the shell (1), auxiliary holes (4) matched with the heat dissipation holes (2) in shape and number are formed in the movable cover (3), the heat dissipation holes (2) and the auxiliary holes (4) are staggered from front to back in a natural state, and the heat dissipation holes (2) are closed; when in use, the heat dissipation hole (2) is communicated with the auxiliary hole (4) for exchanging and dissipating heat of the air inside and outside the shell (1), a dust-proof net cover (18) is arranged on the movable cover (3) at the position corresponding to the auxiliary hole (4), a connecting post (5) is convexly arranged at the center of the rear end of the shell (1), a connecting hole (6) for the connecting post (5) to pass through is formed on the movable cover (3), the end part of the connecting column (5) passes through the connecting hole (6) and is exposed outside the movable cover (3), the end part of the connecting column (5) is screwed with an adjusting nut (7) used for limiting the movable cover (3), the lower end of the movable cover (3) is hinged with a guide rod (13), the lower end of the handle part (17) of the shell (1) extends to form a guide groove (14) matched with the guide rod (13), and a roller (15) is arranged at the contact end of the guide rod (13) and the guide groove (14).
2. The power tool with dust prevention function according to claim 1, wherein a locking groove (19) is convexly formed on the outer wall of the movable cover (3) at the front end of the auxiliary hole (4), an external thread is formed on the outer wall of the movable cover (3) at the rear end of the auxiliary hole (4), one end of the dust prevention net cover (18) is matched with the locking groove (19), and the other end of the dust prevention net cover is provided with an internal thread matched with the external thread.
3. The power tool with dust prevention function according to claim 2, wherein a sealing washer (20) is arranged at the joint of the dust prevention net cover (18) and the clamping groove (19).
4. The power tool with dust-proof function according to claim 1, characterized in that the connecting column (5) comprises a smooth section and a threaded section matched with the adjusting nut (7), and the inner wall of the connecting hole (6) is smoothly arranged.
5. The power tool with the dustproof function according to claim 1, wherein at least two first mounting grooves (8) are convexly arranged at the rear end of the housing (1), second mounting grooves (9) corresponding to the number and the positions of the first mounting grooves (8) are convexly arranged in the movable cover (3), and a spring (10) is clamped between the first mounting grooves (8) and the second mounting grooves (9).
6. A power tool with dust-proof function according to claim 5, characterized in that a first salient point of the positioning spring (10) is arranged in the first mounting groove (8), and a second salient point of the positioning spring (10) is arranged in the second mounting groove (9).
7. The power tool with dust-proof function as claimed in claim 6, wherein the second salient point is provided with a through hole (11) penetrating through the movable cover (3).
8. The power tool with the dustproof function according to claim 6, wherein the bottom of the second mounting groove (9) is provided with an arc hole (12) penetrating through the movable cover (3) in the circumferential direction of the second salient point.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811401291.XA CN109333463B (en) | 2018-11-22 | 2018-11-22 | Electric tool with dustproof function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811401291.XA CN109333463B (en) | 2018-11-22 | 2018-11-22 | Electric tool with dustproof function |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109333463A CN109333463A (en) | 2019-02-15 |
| CN109333463B true CN109333463B (en) | 2021-01-12 |
Family
ID=65317218
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811401291.XA Expired - Fee Related CN109333463B (en) | 2018-11-22 | 2018-11-22 | Electric tool with dustproof function |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109333463B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112720371A (en) * | 2020-05-12 | 2021-04-30 | 浙江动一新能源动力科技股份有限公司 | Electric tool shell and electric tool |
| CN112633033A (en) * | 2020-12-07 | 2021-04-09 | 杭州土垚科技有限公司 | College enrollment intention analyzer and analysis method based on Internet of things |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4187283B2 (en) * | 1996-07-05 | 2008-11-26 | 日立工機株式会社 | Electric tool |
| JPH1142570A (en) * | 1997-07-28 | 1999-02-16 | Matsushita Electric Works Ltd | Power tool |
| DE20301042U1 (en) * | 2003-01-24 | 2003-03-27 | Tts Tooltechnic Systems Ag | drill |
| CN102990118A (en) * | 2011-09-09 | 2013-03-27 | 启东市东云机电有限公司 | High temperature prevention electric hand drill |
| CN204686831U (en) * | 2014-10-15 | 2015-10-07 | 宁波耀升工具实业有限公司 | Electric tool |
| CN207629250U (en) * | 2017-11-23 | 2018-07-20 | 天津拾起卖再生资源回收有限公司 | A kind of highly practical electric perforator |
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2018
- 2018-11-22 CN CN201811401291.XA patent/CN109333463B/en not_active Expired - Fee Related
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| CN109333463A (en) | 2019-02-15 |
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Granted publication date: 20210112 |