CN110774207B - Telescopic ratchet type screwdriver - Google Patents
Telescopic ratchet type screwdriver Download PDFInfo
- Publication number
- CN110774207B CN110774207B CN201911132800.8A CN201911132800A CN110774207B CN 110774207 B CN110774207 B CN 110774207B CN 201911132800 A CN201911132800 A CN 201911132800A CN 110774207 B CN110774207 B CN 110774207B
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- CN
- China
- Prior art keywords
- screwdriver
- handle
- ratchet wheel
- brake plate
- sliding sleeve
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- 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.)
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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
- B25B15/02—Screwdrivers operated by rotating the handle
- B25B15/04—Screwdrivers operated by rotating the handle with ratchet action
Abstract
The invention discloses a telescopic ratchet wheel type screwdriver, which relates to the technical field of screwdrivers and comprises a handle, a screwdriver rod, a ratchet wheel assembly and a locking mechanism, wherein the handle is provided with an inner cavity with an opening at the front end, the screwdriver rod is arranged in the handle from the opening at the front end of the inner cavity of the handle and movably penetrates through the locking mechanism and the ratchet wheel assembly, the screwdriver rod is provided with a plurality of locking positions which are distributed in the front and back direction and are used for locking the screwdriver rod by the locking mechanism, and the ratchet wheel assembly can simultaneously brake the rotary motion of the screwdriver rod in two directions or selectively brake the rotary motion of the screwdriver rod in one direction. The length of the whole screwdriver can be adjusted by adjusting the extending length of the screwdriver rod relative to the handle, so that the screwdriver is suitable for different operating environments, and the practicability is enhanced. The ratchet wheel component has a one-way braking effect on the ratchet wheel, the handle is connected with the ratchet wheel component, and the handle can rotate leftwards and rightwards relative to the screwdriver rod through adjustment of the ratchet wheel component, so that the screw can be conveniently screwed or unscrewed.
Description
In the technical field
The invention relates to the technical field of screwdrivers, in particular to a telescopic ratchet type screwdriver.
Background
At present, when working in spaces with different sizes, workers need to frequently replace screwdrivers with different lengths in order to adapt to different working environments, so that the improvement of the working efficiency is not facilitated, a large number of screwdrivers with different lengths need to be carried, and sometimes the working activities cannot be carried out because the lengths of the screwdrivers do not meet the use requirements. When the common screwdriver is used, a user needs to continuously make actions of loosening and tightening the palm so as to facilitate the palm to be positioned at a position where force is easy to apply to smooth teeth, and the use is very inconvenient.
Disclosure of Invention
The invention aims to provide a telescopic ratchet wheel type screwdriver, which solves the problems that the length of the existing screwdriver cannot be adjusted, various working environments are difficult to meet, and a user needs to continuously make actions of loosening and tightening a palm, so that the use is inconvenient.
In order to achieve the purpose, the invention adopts the following technical scheme:
a telescopic ratchet type screwdriver comprises a handle, a screwdriver rod, a ratchet assembly and a locking mechanism, wherein the handle is provided with an inner cavity with an opening at the front end, the screwdriver rod is installed into the handle from the opening at the front end of the inner cavity of the handle and movably penetrates through the locking mechanism and the ratchet assembly, a plurality of locking positions distributed in the front and back direction are arranged on the screwdriver rod and used for locking the screwdriver rod through the locking mechanism, and the ratchet assembly can brake the rotation motion of the screwdriver rod in two directions or selectively brake the rotation motion of the screwdriver rod in one direction.
Furthermore, the ratchet wheel assembly comprises a ratchet wheel, a first brake plate, a second brake plate and a reversing mechanism, the screwdriver rod penetrates through the ratchet wheel and the screwdriver rod and the ratchet wheel rotate synchronously, the reversing mechanism is provided with three reversing positions along the axial direction of the handle, and the three reversing positions respectively and correspondingly insert the first brake plate, the second brake plate and the first brake plate and the second brake plate into teeth of the ratchet wheel simultaneously to brake the ratchet wheel.
Furthermore, the reversing mechanism comprises a shifting block protruding out of the handle, the shifting block is provided with two push rods extending into a space between the two brake plates, the first brake plate respectively extends two forward-inclined guide inclined planes towards the front sides of the two push rods, the second brake plate respectively extends two backward-inclined guide inclined planes towards the rear sides of the two push rods, and the reversing mechanism respectively moves back and forth along the axial direction to be converted into transverse movement of the first brake plate and the second brake plate away from the ratchet wheel by means of pushing of the push rods on the guide inclined planes.
Furthermore, the reversing mechanism further comprises a positioning plate which moves back and forth simultaneously with the shifting block, the shifting block penetrates through the positioning plate and then protrudes at the front end of the handle, a spring which stretches along the radial direction of the handle is arranged between the positioning plate and the shifting block, a pair of positioning protrusions protrude out of the outer side of the positioning plate, three pairs of positioning concave parts are arranged on the handle, the pair of positioning protrusions are selectively positioned in one of the three pairs of positioning concave parts, and the three pairs of positioning concave parts respectively correspond to three reversing positions of the reversing mechanism.
Furthermore, one side of the first brake plate and one side of the second brake plate, which are far away from the ratchet wheel, are both provided with brake plate return springs, and the first brake plate and the second brake plate have a tendency of approaching towards the ratchet wheel under the action of the brake plate return springs.
Further, the reversing mechanism comprises a ratchet wheel seat rotating synchronously with the handle, and the first brake plate and the second brake plate are relatively and slidably arranged in two transverse grooves in the ratchet wheel seat.
Further, locking mechanism includes the inner sliding sleeve, outer sliding sleeve and ball, be equipped with the ball that runs through the inner sliding sleeve lateral wall on the inner sliding sleeve and accomodate the hole, outer sliding sleeve movably overlaps in the inner sliding sleeve outside, the hole middle section protrusion of outer sliding sleeve forms annular pressure portion, form annular ball groove of stepping down between the hole anterior segment of outer sliding sleeve and the outer wall of inner sliding sleeve, be equipped with a plurality of annular grooves on the screwdriver pole, when the hole was accomodate to the ball is aimed at to the annular groove, pressure portion supports and presses the axial displacement in order to pin the screwdriver pole in the ball gets into the annular groove, when the hole was accomodate to ball groove intercommunication ball, the ball can leave the annular groove and unblock the screwdriver pole.
Furthermore, an outer sliding sleeve return spring is sleeved on the inner sliding sleeve, and the outer sliding sleeve return spring applies an acting force to the outer sliding sleeve to enable the outer sliding sleeve to move from the position of locking the screwdriver rod to the position of unlocking the screwdriver rod.
Further, the inner chamber back end of handle is equipped with the screwdriver frame that is used for saving screwdriver head, screwdriver frame has the hole that can hold screwdriver pole, screwdriver frame front end is equipped with two relative draw-in grooves, handle front end outside is equipped with two relative buttons, the rear end of two buttons forms the pothook that inserts in the handle inner chamber separately, be equipped with one in the inner chamber of handle along the U-shaped elastic strip of handle circumference toward supporting two buttons so that two pothooks and two draw-in groove locks on the screwdriver frame outward, press two buttons simultaneously in opposite directions from the handle outside and enable pothook and draw-in groove and break away from.
Furthermore, the front end of the screw tool holder is abutted with a screw tool holder return spring which is arranged along the axial direction and is in a compression state, and the screw tool holder return spring rebounds to push the screw tool holder out of the rear end of the inner cavity of the handle when the clamping hook is separated from the clamping groove.
Compared with the prior art, the invention has the following advantages:
1. the length of the whole screwdriver can be adjusted by adjusting the extending length of the screwdriver rod relative to the handle so as to adapt to different operating environments and enhance the practicability.
2. The ratchet wheel component has a one-way braking effect on the ratchet wheel, the handle is connected with the ratchet wheel component, and the handle can rotate leftwards and rightwards relative to the screwdriver rod through adjustment of the ratchet wheel component, so that the screw can be conveniently screwed or unscrewed.
Drawings
FIG. 1 is a perspective view of a screwdriver of the present invention;
FIG. 2 is a schematic view of the locking mechanism locking the screwdriver shank;
FIG. 3 is a schematic view of the screwdriver shank as it moves within the handle;
FIG. 4 is a partial schematic structural view of the ratchet assembly;
FIG. 5 is a perspective view of the two brake plates and the ratchet wheel;
FIG. 6 is an exploded view of the reversing mechanism;
FIG. 7 is a schematic view of the ratchet in a locked state;
FIG. 8 is a schematic view of the first brake plate releasing braking of the ratchet;
FIG. 9 is a schematic view of the second brake plate releasing braking of the ratchet;
FIG. 10 is a perspective view of the screw holder;
fig. 11 is a schematic view of the screw boss and the push button snap-fit.
Detailed Description
To further illustrate the various embodiments, the invention provides the accompanying drawings. The accompanying drawings, which are incorporated in and constitute a part of this disclosure, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the embodiments. Those skilled in the art will appreciate still other possible embodiments and advantages of the present invention with reference to these figures. Elements in the figures are not drawn to scale and like reference numerals are generally used to indicate like elements.
As shown in fig. 1 to 11, a retractable ratchet screwdriver comprises a handle 10, a screwdriver rod 20, a ratchet assembly 30 and a locking mechanism 40, wherein the handle 10 has an inner cavity with an opening at the front end, the screwdriver rod 20 is installed in the handle 10 from the opening at the front end of the inner cavity of the handle 10 and movably passes through the locking mechanism 40 and the ratchet assembly 30, the screwdriver rod 20 is provided with a plurality of locking positions distributed back and forth for the locking mechanism 40 to lock the screwdriver rod 20, and the ratchet assembly 30 can simultaneously brake the rotation motion of the screwdriver rod 20 in two directions or selectively brake the rotation motion of the screwdriver rod 20 in one direction.
As shown in fig. 4 and 5, the ratchet assembly 30 includes a ratchet 301, a first brake plate 302, a second brake plate 303 and a reversing mechanism 304, the screwdriver rod 20 penetrates through the ratchet 301 and rotates synchronously with the ratchet 301, the reversing mechanism 304 has three reversing positions along the axial direction of the handle 10, and the three reversing positions respectively correspond to the first brake plate 302, the second brake plate 303 and the two are inserted into the teeth of the ratchet 301 to brake the ratchet 301.
As shown in fig. 5 and fig. 6, the reversing mechanism 304 includes a shifting block 3041 protruding out of the handle 10, the shifting block 3041 has two push rods 30411 extending between the two brake plates, the first brake plate 302 extends two forward inclined guide inclined surfaces 305 toward the front sides of the two push rods 30411, respectively, and the second brake plate 303 extends two backward inclined guide inclined surfaces 305 toward the back sides of the two push rods 30411, respectively, and the forward and backward movement of the reversing mechanism 304 along the axial direction is converted into the lateral movement of the first brake plate 302 and the second brake plate 303 away from the ratchet wheel 301 by the push of the push rods 30411 on the guide inclined surfaces 305.
The reversing mechanism 304 further includes a positioning plate 3042 moving back and forth simultaneously with the dial 3041, the dial 3041 passes through the positioning plate 3042 and protrudes at the front end of the handle 10, a spring extending and contracting along the radial direction of the handle 10 is disposed between the positioning plate 3042 and the dial 3041, a pair of positioning protrusions 30421 protrudes from the outer side of the positioning plate 3042, the handle 10 is provided with three pairs of positioning recesses, the positioning protrusions 30421 are selectively located in one of the three pairs of positioning recesses, and the three pairs of positioning recesses respectively correspond to the three reversing positions of the reversing mechanism 304.
Both the first brake plate 302 and the second brake plate 303 are provided with a brake plate return spring 306 on the side facing away from the ratchet wheel 301, and the first brake plate 302 and the second brake plate 303 have a tendency to approach the ratchet wheel 301 under the action of the brake plate return spring 306.
The reversing mechanism 304 includes a ratchet wheel base 3043 that rotates synchronously with the handle 10, and the first brake plate 302 and the second brake plate 303 are slidably disposed in two lateral grooves on the ratchet wheel base 3043 in opposition.
As shown in fig. 2 and 3, the locking mechanism 40 includes an inner sliding sleeve 401, an outer sliding sleeve 402 and balls 403, the inner sliding sleeve 401 is provided with ball receiving holes penetrating through the side wall of the inner sliding sleeve 401, the outer sliding sleeve 402 is movably sleeved outside the inner sliding sleeve 401, the middle section of the inner hole of the outer sliding sleeve 402 protrudes to form an annular pressing portion, an annular ball abdicating groove is formed between the front section of the inner hole of the outer sliding sleeve 402 and the outer wall of the inner sliding sleeve, the screwdriver rod 20 is provided with a plurality of annular grooves 201, when the annular grooves 201 are aligned with the ball receiving holes, the pressing portion presses the balls 403 into the annular grooves 201 to lock the axial movement of the screwdriver rod 20, and when the ball abdicating grooves communicate with the ball receiving holes, the balls 403 can leave the annular grooves 201 to unlock the screwdriver rod 20.
An outer sliding sleeve return spring 404 is sleeved on the inner sliding sleeve 401, and the outer sliding sleeve return spring 404 applies an acting force to the outer sliding sleeve 402 to move from the position of locking the screwdriver rod 20 to the position of unlocking the screwdriver rod 20.
As shown in fig. 2, 9 and 10, the rear portion of the inner cavity of the handle 10 is provided with a screwdriver holder 50 for storing a screwdriver bit, the screwdriver holder 50 has an inner hole for receiving the screwdriver rod 20, and the screwdriver holder 50 is fitted over the screwdriver rod 20 to save the entire length of the screwdriver. The front end of the screw tool holder 50 is provided with two opposite clamping grooves 501, the outer part of the front end of the handle 10 is provided with two opposite buttons 60, the rear ends of the two buttons 60 respectively form clamping hooks 601 inserted into the inner cavity of the handle 10, the inner cavity of the handle 10 is provided with a U-shaped elastic strip 80 which outwards supports the two buttons 60 along the circumferential direction of the handle 10 so as to enable the two clamping hooks 601 to be buckled with the two clamping grooves 501 on the screw tool holder 50, and the two buttons 60 are simultaneously pressed oppositely from the outer part of the handle 10 to enable the clamping hooks 601 to be separated from the clamping grooves 501. The front end of the screw holder 50 is abutted with a screw holder return spring 70 which is arranged along the axial direction and is in a compressed state, and the screw holder return spring 70 rebounds to push the screw holder 50 out of the rear end of the inner cavity of the handle 10 when the clamping hook 601 is separated from the clamping groove 501. When the external force on the button 60 is removed, the button 60 is reset under the action of the U-shaped elastic strip 80, the screw holder 50 is inserted forward into the inner cavity of the handle 10, and the clamping groove 501 at the front end of the screw holder 50 is automatically buckled with the clamping hook 601 of the button 60.
Based on the state shown in fig. 7, the dial block 3041 is pulled forward, the positioning plate 3042 is forced to move forward in synchronization with the dial block 3041, the push rod 30411 pushes the first braking plate 302 away from the ratchet wheel 301, the spring between the positioning plate 3042 and the dial block 3041 is compressed, when the positioning protrusion 30421 moves to align with the previous pair of positioning recesses, the positioning protrusion 30421 automatically springs into the positioning recess under the action of the spring, so as to determine the position of the reversing mechanism 304, and the positional relationship between the two braking plates and the ratchet wheel 301 is maintained in the state shown in fig. 8, and the handle 10 can idle relative to the ratchet wheel 301 in the direction of the arrow shown in fig. 8.
On the basis of the state shown in fig. 7, the dial block 3041 is pulled backward, the second brake plate 303 is pushed away from the ratchet wheel 301 by the push rod 30411, and at the same time, the positioning projection 30421 is inserted into the latter positioning recess to maintain the positional relationship between the two brake plates and the ratchet wheel 301 in the state shown in fig. 9, and the handle 10 in fig. 9 can be idly rotated in the direction of the arrow relative to the ratchet wheel 301.
By adjusting the braking state of the two braking plates to the ratchet wheel 301, the handle 10 can perform unidirectional idle rotation in two directions relative to the screwdriver rod 20 and can also rotate synchronously with the screwdriver, so that the screwdriver is convenient to tighten or loosen the screwdriver, and the comfort level is improved.
While the invention has been particularly shown and described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (8)
1. A retractable ratchet type screwdriver is characterized in that: the screwdriver rod is provided with a plurality of locking positions which are distributed front and back and are used for locking the screwdriver rod by the locking mechanism, and the ratchet wheel component can simultaneously brake the rotary motion of the screwdriver rod in two directions or selectively brake the rotary motion of the screwdriver rod in one direction; a screwdriver rack for storing screwdriver heads is arranged at the rear section of the inner cavity of the handle;
the ratchet wheel assembly comprises a ratchet wheel, a first brake plate, a second brake plate and a reversing mechanism, the screwdriver rod penetrates through the ratchet wheel and synchronously rotates with the ratchet wheel, the reversing mechanism is provided with three reversing positions along the axial direction of the handle, and the three reversing positions respectively and correspondingly insert the first brake plate, the second brake plate and the first brake plate and the second brake plate into teeth of the ratchet wheel to brake the ratchet wheel;
the reversing mechanism comprises a shifting block protruding out of the handle, the shifting block is provided with two push rods extending between the two brake plates, the first brake plate respectively extends two forward-inclined guide inclined planes towards the front sides of the two push rods, the second brake plate respectively extends two backward-inclined guide inclined planes towards the rear sides of the two push rods, and the reversing mechanism respectively moves back and forth along the axial direction to be converted into transverse movement of the first brake plate and the second brake plate away from the ratchet wheel by means of pushing of the push rods on the guide inclined planes.
2. The retractable ratcheting screwdriver of claim 1, wherein: the reversing mechanism further comprises a positioning plate which moves back and forth simultaneously with the shifting block, the shifting block penetrates through the positioning plate, the rear protrusion is arranged at the front end of the handle, a spring which stretches out and draws back along the radial direction of the handle is arranged between the positioning plate and the shifting block, a pair of positioning protrusions are protruded on the outer side of the positioning plate, three pairs of positioning concave parts are arranged on the handle, the pair of positioning protrusions are selectively arranged in one of the three pairs of positioning concave parts, and the three pairs of positioning concave parts respectively correspond to three reversing positions of the reversing mechanism.
3. The retractable ratcheting screwdriver of claim 1, wherein: the side of the first brake plate and the side of the second brake plate, which are far away from the ratchet wheel, are both provided with brake plate return springs, and the first brake plate and the second brake plate have the tendency of approaching the ratchet wheel under the action of the brake plate return springs.
4. The retractable ratcheting screwdriver of claim 1, wherein: the reversing mechanism comprises a ratchet wheel seat rotating synchronously with the handle, and the first brake plate and the second brake plate are arranged in two transverse grooves on the ratchet wheel seat in a relatively sliding mode.
5. The retractable ratcheting screwdriver of claim 1, wherein: locking mechanism includes the inner sliding sleeve, outer sliding sleeve and ball, be equipped with the ball that runs through the inner sliding sleeve lateral wall on the inner sliding sleeve and accomodate the hole, outer sliding sleeve movably overlaps in the inner sliding sleeve outside, the hole middle section protrusion of outer sliding sleeve forms annular pressure portion, form annular ball groove of stepping down between the hole anterior segment of outer sliding sleeve and the outer wall of inner sliding sleeve, be equipped with a plurality of annular grooves on the screwdriver pole, when the hole was accomodate to the ball is aimed at to the annular groove, the pressure portion supports presses the axial displacement that the ball got into in the annular groove in order to pin the screwdriver pole, when the hole was accomodate to ball groove intercommunication ball, the ball can leave the annular groove and unblock the screwdriver pole.
6. The retractable ratcheting screwdriver of claim 5, wherein: the outer sliding sleeve is sleeved with an outer sliding sleeve return spring, and the outer sliding sleeve return spring applies acting force to the outer sliding sleeve to enable the outer sliding sleeve to move from the position of locking the screwdriver rod to the position of unlocking the screwdriver rod.
7. The retractable ratcheting screwdriver of claim 1, wherein: the screwdriver frame is provided with an inner hole capable of accommodating a screwdriver rod, the front end of the screwdriver frame is provided with two opposite clamping grooves, two opposite buttons are arranged outside the front end of the handle, the rear ends of the two buttons respectively form clamping hooks inserted into the inner cavity of the handle, a U-shaped elastic strip which outwards supports the two buttons along the circumferential direction of the handle so as to enable the two clamping hooks to be buckled with the two clamping grooves on the screwdriver frame is arranged in the inner cavity of the handle, and the clamping hooks can be separated from the clamping grooves by simultaneously pressing the two buttons in opposite directions from the outside of the handle.
8. The retractable ratcheting screwdriver of claim 7, wherein: the front end of the screw tool rest is abutted with a screw tool rest reset spring which is arranged along the axial direction and is in a compression state, and the screw tool rest reset spring rebounds to push the screw tool rest out of the rear end of the inner cavity of the handle when the clamping hook is separated from the clamping groove.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911132800.8A CN110774207B (en) | 2019-11-19 | 2019-11-19 | Telescopic ratchet type screwdriver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911132800.8A CN110774207B (en) | 2019-11-19 | 2019-11-19 | Telescopic ratchet type screwdriver |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110774207A CN110774207A (en) | 2020-02-11 |
| CN110774207B true CN110774207B (en) | 2021-11-26 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911132800.8A Active CN110774207B (en) | 2019-11-19 | 2019-11-19 | Telescopic ratchet type screwdriver |
Country Status (1)
| Country | Link |
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| CN (1) | CN110774207B (en) |
Family Cites Families (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4030384A (en) * | 1976-08-09 | 1977-06-21 | Newman David P | Ratchet wrench |
| DE29619529U1 (en) * | 1996-11-09 | 1997-01-09 | Maiwald Ursula | Screwdriver with adjustable shaft |
| US5974915A (en) * | 1998-06-15 | 1999-11-02 | Chou; Mei Chu | Ratchet screw driver |
| TW404321U (en) * | 1998-09-14 | 2000-09-01 | Tzeng Fei Hai | Ratchet screw-driver with illuminative structure |
| TW410713U (en) * | 1999-06-29 | 2000-11-01 | Lin Shing Dai | Improved retractable ratcheting type screwdriver |
| TW447373U (en) * | 2000-12-21 | 2001-07-21 | Shiau Jie Ren | Ratchet mechanism for hand tool |
| TWM261324U (en) * | 2004-07-02 | 2005-04-11 | Ye Shing Entpr Co Ltd | Ratchet screwdriver having fast-extendible positioning joint |
| CN2745702Y (en) * | 2004-10-15 | 2005-12-14 | 黄振利 | Structure of ratchet and junction |
| TWM270884U (en) * | 2004-10-28 | 2005-07-21 | Yung-Shing Chiou | Improved structure for ratchet driven retractable hand tool |
| US7051626B1 (en) * | 2005-02-05 | 2006-05-30 | Yi Ying Chen | Screwdriver having release mechanism |
| CN201320735Y (en) * | 2008-12-15 | 2009-10-07 | 吴贤达 | Hobnail rotator |
| CN201711912U (en) * | 2010-06-18 | 2011-01-19 | 工丰企业股份有限公司 | Telescopic type precise ratchet screwdriver |
| CN102848347B (en) * | 2011-06-30 | 2014-12-10 | 徐日雄 | Screwdriver connector with function of transverse rotation reversing |
| CN102862137A (en) * | 2011-07-07 | 2013-01-09 | 杭州巨星工具有限公司 | Bi-direction mechanical straightener |
| CN102950561B (en) * | 2012-11-13 | 2015-09-23 | 厦门南旗佰特精密工具制造有限公司 | A kind of ratchet device and screwdriver |
| US20170106505A1 (en) * | 2015-10-18 | 2017-04-20 | Man-Chi Chang | Ratchet wrench |
-
2019
- 2019-11-19 CN CN201911132800.8A patent/CN110774207B/en active Active
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| CN110774207A (en) | 2020-02-11 |
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| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of invention: A retractable ratchet screwdriver Effective date of registration: 20230828 Granted publication date: 20211126 Pledgee: Bank of China Limited Xiamen Tong'an sub branch Pledgor: XIAMEN NANCHBIT PRECISION TOOLS Co.,Ltd. Registration number: Y2023980054103 |
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