CN110977851A - Tool for manually disassembling screw - Google Patents
Tool for manually disassembling screw Download PDFInfo
- Publication number
- CN110977851A CN110977851A CN201911344066.1A CN201911344066A CN110977851A CN 110977851 A CN110977851 A CN 110977851A CN 201911344066 A CN201911344066 A CN 201911344066A CN 110977851 A CN110977851 A CN 110977851A
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- Prior art keywords
- sleeve
- screwdriver head
- rotating body
- tool
- virtual axis
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
- B25B15/00—Screwdrivers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
- B25B23/00—Details of, or accessories for, spanners, wrenches, screwdrivers
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Hand Tools For Fitting Together And Separating, Or Other Hand Tools (AREA)
Abstract
The invention provides a tool for manually disassembling a screw, which comprises a screwdriver head, a sleeve and a driving device, wherein the sleeve is arranged on the screwdriver head; the virtual axis of the screwdriver head and the virtual axis of the sleeve are coaxially arranged; the non-working end of the screwdriver head is connected with the driving device; the screwdriver head moves along the virtual axis direction of the screwdriver head while rotating along the virtual axis of the screwdriver head under the action of the driving device. The screwdriver head is rotary motion to achieve the purpose of unscrewing the screw, the screwdriver head can be guaranteed to be tightly attached to the head of the screw all the time in the unscrewing process by moving along the direction of the virtual axis, and the situation that patterns on the head of the screw are damaged and the screw cannot be unscrewed due to the fact that the screwdriver head and the head of the screw are not tightly attached to each other in the unscrewing process is prevented. The processes of rotation and movement are carried out simultaneously, so that the damage to the screw in the disassembling process is small.
Description
Technical Field
The invention relates to the technical field of hardware tools, in particular to a tool for manually disassembling a screw.
Background
In the field of wood furniture processing, a screw is a common connecting part, and the screw is often required to be detached in the use process; but the disassembly process is very laborious, and the main reason is that the labor-saving effect of the traditional manual screwdriver is not obvious; in the process of disassembly, if the traditional manual screwdriver is used with too much force and is not tightly contacted with a screw, patterns on the head of the screw are often damaged, so that the matching surface between the screw and the screwdriver is damaged, and finally the screw-heavy wood plate is difficult to take down.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the invention provides a tool for manually disassembling a screw, which can be used for loosening the screw while preventing the head of the screw from being damaged.
In order to solve the technical problems, the invention adopts the technical scheme that:
a tool for manually disassembling a screw comprises a screwdriver bit, a sleeve and a driving device;
the virtual axis of the screwdriver head and the virtual axis of the sleeve are coaxially arranged;
the non-working end of the screwdriver head is connected with the driving device;
the screwdriver head moves along the virtual axis direction of the screwdriver head while rotating along the virtual axis of the screwdriver head under the action of the driving device.
The invention has the beneficial effects that: the invention provides a tool for manually disassembling a screw, which comprises a screwdriver head, a sleeve and a driving device, wherein the sleeve is arranged on the screwdriver head; the virtual axis of the screwdriver head and the virtual axis of the sleeve are coaxially arranged; the non-working end of the screwdriver head is connected with the driving device; the screwdriver head moves along the virtual axis direction of the screwdriver head while rotating along the virtual axis of the screwdriver head under the action of the driving device. The screwdriver head is rotary motion and reaches the purpose of unscrewing the screw, and it can be guaranteed that screwdriver head can closely laminate with the head of screw all the time at the unscrewing in-process along the removal of virtual axis direction, compares in traditional screw disassembly's instrument, and this device can prevent at the unscrewing in-process, suffers destruction because of the screwdriver head is inseparable enough with the decorative pattern that causes the screwhead with the laminating of screwhead, and can't unscrew the screw. The processes of rotation and movement are carried out simultaneously, so that the damage to the screw in the disassembling process is small.
Drawings
FIG. 1 is a schematic structural view of a tool for manually removing screws according to an embodiment of the present invention;
FIG. 2 is an exploded view of a tool for manually removing a screw in accordance with an embodiment of the present invention;
FIG. 3 is a cross-sectional view of a tool for manually removing screws in a reset state according to an embodiment of the present invention;
FIG. 4 is a sectional view of a tool for manually removing a screw according to an embodiment of the present invention;
description of reference numerals:
1. a screwdriver bit; 2. a sleeve; 3. a rocker; 4. a wedge block; 5. a rotating body; 6. a bump; 7. a thread groove; 8. a bearing; 9. a fixed shaft; 10. a chuck; 11. a return spring; 12. and a roller.
Detailed Description
In order to explain technical contents, achieved objects, and effects of the present invention in detail, the following description is made with reference to the accompanying drawings in combination with the embodiments.
Referring to fig. 1 to 4, a tool for manually removing a screw includes a screwdriver bit, a sleeve and a driving device;
the virtual axis of the screwdriver head and the virtual axis of the sleeve are coaxially arranged;
the non-working end of the screwdriver head is connected with the driving device;
the screwdriver head moves along the virtual axis direction of the screwdriver head while rotating along the virtual axis of the screwdriver head under the action of the driving device.
From the above description, the beneficial effects of the present invention are: the invention provides a tool for manually disassembling a screw, which comprises a screwdriver head, a sleeve and a driving device, wherein the sleeve is arranged on the screwdriver head; the virtual axis of the screwdriver head and the virtual axis of the sleeve are coaxially arranged; the non-working end of the screwdriver head is connected with the driving device; the screwdriver head moves along the virtual axis direction of the screwdriver head while rotating along the virtual axis of the screwdriver head under the action of the driving device. The screwdriver head is rotary motion and reaches the purpose of unscrewing the screw, and it can be guaranteed that screwdriver head can closely laminate with the head of screw all the time at the unscrewing in-process along the removal of virtual axis direction, compares in traditional screw disassembly's instrument, and this device can prevent at the unscrewing in-process, suffers destruction because of the screwdriver head is inseparable enough with the decorative pattern that causes the screwhead with the laminating of screwhead, and can't unscrew the screw. The processes of rotation and movement are carried out simultaneously, so that the damage to the screw in the disassembling process is small.
Furthermore, the driving device comprises a rocker, a wedge block, a rotor and a bump;
the rotating body is slidably and rotatably sleeved in the sleeve; the virtual rotating axis of the rotating body and the virtual axis of the sleeve are coaxially arranged;
one end of the rotating body is a plane, and the other end of the rotating body is a conical surface;
the plane end of the rotating body is connected with the non-working end of the screwdriver head; the conical surface end of the rotating body is in sliding connection with the inclined wedge surface of the wedge-shaped block;
one end of the wedge-shaped block, which is far away from the wedge-shaped surface, is connected with one end of the rocker in a sliding way;
the wedge block moves along the radial direction of the sleeve;
the rocker is rotatably connected to the side wall of the sleeve; the other end of the rocker is positioned outside the sleeve;
the outer wall of the rotating body is provided with a thread groove;
the lug is fixedly arranged on the inner wall of the sleeve; and one end of the lug is inserted into the thread groove and is connected with the thread groove in a sliding mode.
The working principle of the driving device of the invention is as follows: the rotation of the rocker pushes the wedge block to move along the radial direction of the sleeve, and the wedge block pushes the rotor to move along the axial direction of the sleeve due to the fact that the inclined surface of the wedge block is in contact with the conical surface of the rotor, wherein the outer wall of the sleeve is provided with a thread groove, the thread groove is in sliding connection with a soil block fixed on the inner wall of the sleeve, and therefore the rotor is rotated under the matching of the thread groove and the convex block; therefore, the screwdriver head fixed at the plane end of the rotating body rotates along the axial direction of the sleeve and moves along the axial direction of the sleeve, the head of the screw to be unscrewed is pressed tightly, and meanwhile, the screw is rotated, so that the screw is unscrewed.
As can be seen from the above description, the driving device comprises a rocker, a wedge-shaped block and a thread groove which are labor-saving mechanisms, and the device adopts a triple labor-saving mechanism, so that the manual driving force required by unscrewing the screw is greatly reduced.
Furthermore, the device also comprises a bearing and a fixed shaft;
an installation platform is arranged on the outer wall of the sleeve;
the mounting table is provided with a abdicating groove for the rotation of the rocker;
the fixed shaft is fixedly arranged on the mounting table, and the axis of the fixed shaft is perpendicular to the virtual axis of the sleeve;
the rocker is rotatably arranged on the fixed shaft through the bearing.
As can be seen from the above description, the use of bearings is intended to reduce the friction experienced by the rocker when it rotates. The purpose of the design of the mounting table is to heighten the rotation center of the rocker and prevent the rocker from interfering with the sleeve in the rotation process.
Further, the device also comprises a chuck;
the chuck is fixedly arranged at the plane end of the rotating body; the virtual axis of the chuck and the virtual rotation axis of the rotating body are coaxially arranged;
one end of the chuck, which is far away from the rotating body, is provided with a special-shaped hole; the geometric center of the special-shaped hole is coaxially arranged with the virtual axis of the chuck;
the non-working end of the screwdriver head is provided with a connecting piece matched with the special-shaped hole; the connecting piece is used for fixedly connecting the screwdriver head with the chuck.
As can be seen from the above description, the arrangement of the chuck can be changed with the screwdriver bit of the corresponding model according to the size of the screw and the shape of the screw pattern, so that the applicability and the practicability of the device are improved.
Furthermore, an abdicating round hole for moving the chuck is formed in the end face, close to the screwdriver head, of the sleeve;
the connecting end of the chuck and the screwdriver head is positioned outside the sleeve.
As can be seen from the above description, the clamping end of the chuck is disposed outside the sleeve for the purpose of facilitating the clamping and replacement of the screwdriver bit.
Furthermore, the device also comprises a return spring;
the reset spring is sleeved on the chuck; one end of the reset spring is connected with the end face of the sleeve, and the other end of the reset spring is connected with the plane end of the rotating body.
As can be seen from the above description, the arrangement of the return spring ensures that the rotor can be automatically reset when the external force is lost.
Further, a threaded hole is formed in the sleeve;
the lug is in threaded connection with the threaded hole, and one end of the lug penetrates through the threaded hole to be connected with the threaded groove.
As can be seen from the above description, the protrusion is configured to be screwed into the thread groove from the outside of the sleeve, mainly because the installation is easy; and observing through the threaded hole, and screwing the lug in when the threaded groove is aligned with the threaded hole to realize the matching of the lug and the threaded groove.
Further, a lead angle of the thread groove is larger than an equivalent friction angle of a material of the rotating body.
From the above description, the main reason why the lead angle of the thread groove is larger than the equivalent friction angle of the material of the rotor is to avoid that the wedge block cannot push the rotor in order to satisfy the self-locking condition.
Furthermore, a sliding groove used for the wedge block to slide along the radial direction of the sleeve is formed in the end face, far away from the screwdriver head, of the sleeve.
As can be seen from the above description, the arrangement of the sliding groove can well play a role in positioning the wedge block, so that the wedge block can move along a fixed direction.
Furthermore, a roller is arranged at one end of the rocker, which is in sliding connection with the wedge-shaped block;
the roller is rotatably arranged on the rocker.
According to the description, the arrangement of the roller can better realize that the rocker pushes the wedge block along the radial direction of the sleeve, and the rolling friction replaces the sliding friction to achieve the effect of reducing the friction force.
Referring to fig. 1 to 4, a first embodiment of the present invention is: a tool for manually disassembling a screw comprises a screwdriver bit 1, a sleeve 2 and a driving device;
the virtual axis of the screwdriver head 1 and the virtual axis of the sleeve 2 are coaxially arranged;
the non-working end of the screwdriver head 1 is connected with the driving device;
the screwdriver head 1 moves along the virtual axis direction of the screwdriver head 1 while rotating along the virtual axis of the screwdriver head 1 under the action of the driving device.
Specifically, the front end and the rear end of the sleeve 2 are designed into detachable end covers, and the end covers are fixedly connected with the body of the sleeve 2 in a threaded connection mode.
Wherein, a handle for holding is arranged at one end of the sleeve 2 far away from the screwdriver head 1.
Referring to the drawings, specifically, the driving device includes a rocker 3, a wedge 4, a rotator 5 and a protrusion 6;
the rotating body 5 is slidably and rotatably sleeved in the sleeve 2; and the virtual rotating axis of the rotating body 5 is coaxially arranged with the virtual axis of the sleeve 2;
one end of the rotating body 5 is a plane, and the other end of the rotating body is a conical surface;
the plane end of the rotating body 5 is connected with the non-working end of the screwdriver head 1; the conical surface end of the rotor 5 is in sliding connection with the inclined wedge surface of the wedge block 4;
one end of the wedge-shaped block 4, which is far away from the wedge surface, is connected with one end of the rocker 3 in a sliding way;
the wedge block 4 moves along the radius direction of the sleeve 2;
the rocker 3 is rotatably connected to the side wall of the sleeve 2; the other end of the rocker 3 is positioned outside the sleeve 2;
the outer wall of the rotating body 5 is provided with a thread groove 7;
the lug 6 is fixedly arranged on the inner wall of the sleeve 2; and one end of the projection 6 is inserted into the thread groove 7 and is slidably connected with the thread groove 7.
Wherein the inclination angle of the conical surface and the inclination angle of the inclined surface of the wedge block 4 are complementary;
wherein, the screw direction of the thread groove 7 is the screw loosening direction, and when the screw is loosened by the needle, the screw thread direction of the thread groove is right; the reverse is true.
Referring to fig. 2 to 4, in particular, the present invention further includes a bearing 8 and a fixing shaft 9;
an installation platform is arranged on the outer wall of the sleeve 2;
the mounting table is provided with a abdicating groove for the rotation of the rocker 3;
the fixed shaft 9 is fixedly arranged on the mounting table, and the axis of the fixed shaft 9 is perpendicular to the virtual axis of the sleeve 2;
the rocker 2 is rotatably arranged on the fixed shaft 9 through the bearing 8.
Specifically, the mounting table is fixed on the sleeve 2 by welding.
Preferably, the diameters of the two ends of the fixing shaft 9 are smaller than the diameter of the middle section, so that the bearing 8 can be conveniently and fixedly mounted.
Specifically, the fixing shaft 9 may be formed with threads at both ends of the fixing shaft 9, and nuts may be used to fix both ends of the fixing shaft 9 through the threads.
Referring to fig. 2 to 4, in particular, the present invention further includes a chuck 10;
the chuck 10 is fixedly arranged at the plane end of the rotating body 5; and the virtual axis of the chuck 10 is coaxial with the virtual rotation axis of the rotating body 5;
one end of the chuck 10 far away from the rotating body is provided with a special-shaped hole; the geometric center of the special-shaped hole is arranged coaxially with the virtual axis of the chuck 10;
the non-working end of the screwdriver head 1 is provided with a connecting piece matched with the special-shaped hole; the connecting piece fixedly connects the screwdriver head 1 and the chuck 10.
Specifically, the connecting piece on the screwdriver bit 1 is in transition fit with the special-shaped hole of the chuck 10.
Referring to fig. 2, specifically, an end surface of the sleeve 2 close to the screwdriver bit 1 is provided with a yielding circular hole for the movement of the chuck 10;
the connecting end of the chuck 10 and the screwdriver bit 1 is positioned outside the sleeve 2.
Referring to fig. specifically, the present invention further includes a return spring 11;
the reset spring 11 is sleeved on the chuck 10; one end of the reset spring 11 is connected with the end face of the sleeve 2, and the other end is connected with the plane end of the rotating body 5.
Wherein, the return spring 11 is a compression spring; specifically, the return spring 11 is in a compressed state during the moving stroke of the rotating body 5.
Referring to fig. 2 to 4, specifically, a threaded hole is formed on the sleeve 2;
the lug 6 is in threaded connection with the threaded hole, and one end of the lug penetrates through the threaded hole to be connected with the threaded groove 7.
The bump 6 is in clearance fit with the thread groove 7, and the bottom end of the bump 6 is not in contact with the bottom surface of the thread groove 7.
Referring to fig. 2 to 4, specifically, the lead angle of the thread groove 7 is larger than the equivalent friction angle of the material of the rotor 5.
Referring to fig. 3 and 4, specifically, a sliding groove for sliding the wedge block 4 along the radial direction of the sleeve 2 is provided on an end surface of the sleeve 2 away from the screwdriver bit 1.
Specifically, the wedge-shaped block 4 is matched with the sliding groove in a small clearance amount.
Referring to fig. 2 to 4, specifically, a roller 12 is disposed at one end of the rocker 3 slidably connected to the wedge block 4;
the rollers 12 are rotatably arranged on the rocker 3.
Specifically, a fixed shaft for clamping the roller 12 is arranged at the connecting end of the rocker 3 and the roller 12, and the roller 12 is sleeved on the fixed shaft.
In summary, the tool for manually disassembling the screw provided by the invention comprises a screwdriver bit, a sleeve and a driving device; the virtual axis of the screwdriver head and the virtual axis of the sleeve are coaxially arranged; the non-working end of the screwdriver head is connected with the driving device; the screwdriver head moves along the virtual axis direction of the screwdriver head while rotating along the virtual axis of the screwdriver head under the action of the driving device. Furthermore, the driving device comprises a rocker, a wedge-shaped block and a thread groove which are labor-saving mechanisms, and the device adopts a triple labor-saving mechanism, so that the manual driving force required by unscrewing the screw is greatly reduced. The screwdriver head is rotary motion to achieve the purpose of unscrewing the screw, the screwdriver head can be guaranteed to be tightly attached to the head of the screw all the time in the unscrewing process by moving along the direction of the virtual axis, and the situation that patterns on the head of the screw are damaged and the screw cannot be unscrewed due to the fact that the screwdriver head and the head of the screw are not tightly attached to each other in the unscrewing process is prevented. The processes of rotation and movement are carried out simultaneously, so that the damage to the screw in the disassembling process is small.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all equivalent changes made by using the contents of the present specification and the drawings, or applied directly or indirectly to the related technical fields, are included in the scope of the present invention.
Claims (10)
1. A tool for manually disassembling a screw is characterized by comprising a screwdriver bit, a sleeve and a driving device;
the virtual axis of the screwdriver head and the virtual axis of the sleeve are coaxially arranged;
the non-working end of the screwdriver head is connected with the driving device;
the screwdriver head moves along the virtual axis direction of the screwdriver head while rotating along the virtual axis of the screwdriver head under the action of the driving device.
2. A tool for manually removing screws according to claim 1, wherein said driving means comprises a rocker, a wedge, a rotator and a projection;
the rotating body is slidably and rotatably sleeved in the sleeve; the virtual rotating axis of the rotating body and the virtual axis of the sleeve are coaxially arranged;
one end of the rotating body is a plane, and the other end of the rotating body is a conical surface;
the plane end of the rotating body is connected with the non-working end of the screwdriver head; the conical surface end of the rotating body is in sliding connection with the inclined wedge surface of the wedge-shaped block;
one end of the wedge-shaped block, which is far away from the wedge-shaped surface, is connected with one end of the rocker in a sliding way;
the wedge block moves along the radial direction of the sleeve;
the rocker is rotatably connected to the side wall of the sleeve; the other end of the rocker is positioned outside the sleeve;
the outer wall of the rotating body is provided with a thread groove;
the lug is fixedly arranged on the inner wall of the sleeve; and one end of the lug is inserted into the thread groove and is connected with the thread groove in a sliding mode.
3. A tool for manually removing screws of claim 2 further comprising a bearing and a fixed shaft;
an installation platform is arranged on the outer wall of the sleeve;
the mounting table is provided with a abdicating groove for the rotation of the rocker;
the fixed shaft is fixedly arranged on the mounting table, and the axis of the fixed shaft is perpendicular to the virtual axis of the sleeve;
the rocker is rotatably arranged on the fixed shaft through the bearing.
4. A tool for manually removing a screw according to claim 2, further comprising a collet;
the chuck is fixedly arranged at the plane end of the rotating body; the virtual axis of the chuck and the virtual rotation axis of the rotating body are coaxially arranged;
one end of the chuck, which is far away from the rotating body, is provided with a special-shaped hole; the geometric center of the special-shaped hole is coaxially arranged with the virtual axis of the chuck;
the non-working end of the screwdriver head is provided with a connecting piece matched with the special-shaped hole; the connecting piece is used for fixedly connecting the screwdriver head with the chuck.
5. A tool for manually removing screws according to claim 4, wherein the end surface of the sleeve, which is close to the screwdriver bit, is provided with a relief round hole for the chuck to move;
the connecting end of the chuck and the screwdriver head is positioned outside the sleeve.
6. A tool for manually removing screws according to claim 4, further comprising a return spring;
the reset spring is sleeved on the chuck; one end of the reset spring is connected with the end face of the sleeve, and the other end of the reset spring is connected with the plane end of the rotating body.
7. A tool for manually removing screws as claimed in claim 2, wherein said sleeve has a threaded bore;
the lug is in threaded connection with the threaded hole, and one end of the lug penetrates through the threaded hole to be connected with the threaded groove.
8. A tool for manually removing screws as defined in claim 2, wherein the lead angle of said thread groove is greater than the equivalent friction angle of the material of said rotor.
9. The tool for manually removing screws of claim 2, wherein the end surface of the sleeve remote from the screwdriver bit is provided with a sliding groove for the wedge block to slide along the radial direction of the sleeve.
10. The tool for manually removing screws of claim 2, wherein the end of the rocker slidably connected to the wedge is provided with a roller;
the roller is rotatably arranged on the rocker.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911344066.1A CN110977851A (en) | 2019-12-24 | 2019-12-24 | Tool for manually disassembling screw |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911344066.1A CN110977851A (en) | 2019-12-24 | 2019-12-24 | Tool for manually disassembling screw |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110977851A true CN110977851A (en) | 2020-04-10 |
Family
ID=70076012
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911344066.1A Pending CN110977851A (en) | 2019-12-24 | 2019-12-24 | Tool for manually disassembling screw |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110977851A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6182535B1 (en) * | 1998-11-25 | 2001-02-06 | Lucent Technologies Inc. | Fuse insertion device |
| JP5261630B2 (en) * | 2007-12-07 | 2013-08-14 | 中国電力株式会社 | Rotating tool |
| CN206839970U (en) * | 2017-06-20 | 2018-01-05 | 中冶建工集团有限公司 | A kind of semi-automatic screwdriver |
| CN207915356U (en) * | 2018-01-04 | 2018-09-28 | 国投物业有限责任公司北京一分公司 | A kind of reversed power-assisted screwdriver |
| CN110216615A (en) * | 2019-06-28 | 2019-09-10 | 国网山东省电力公司济南市章丘区供电公司 | One kind can be manually rotated screwdriver |
-
2019
- 2019-12-24 CN CN201911344066.1A patent/CN110977851A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6182535B1 (en) * | 1998-11-25 | 2001-02-06 | Lucent Technologies Inc. | Fuse insertion device |
| JP5261630B2 (en) * | 2007-12-07 | 2013-08-14 | 中国電力株式会社 | Rotating tool |
| CN206839970U (en) * | 2017-06-20 | 2018-01-05 | 中冶建工集团有限公司 | A kind of semi-automatic screwdriver |
| CN207915356U (en) * | 2018-01-04 | 2018-09-28 | 国投物业有限责任公司北京一分公司 | A kind of reversed power-assisted screwdriver |
| CN110216615A (en) * | 2019-06-28 | 2019-09-10 | 国网山东省电力公司济南市章丘区供电公司 | One kind can be manually rotated screwdriver |
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Application publication date: 20200410 |
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