CN113266212A - Pedal control type mortise lock and cable trench cover plate - Google Patents
Pedal control type mortise lock and cable trench cover plate Download PDFInfo
- Publication number
- CN113266212A CN113266212A CN202110427993.0A CN202110427993A CN113266212A CN 113266212 A CN113266212 A CN 113266212A CN 202110427993 A CN202110427993 A CN 202110427993A CN 113266212 A CN113266212 A CN 113266212A
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- CN
- China
- Prior art keywords
- sliding lock
- lock cylinder
- locking tongue
- back plate
- connecting rod
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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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Classifications
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- E—FIXED CONSTRUCTIONS
- E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
- E05B—LOCKS; ACCESSORIES THEREFOR; HANDCUFFS
- E05B53/00—Operation or control of locks by mechanical transmissions, e.g. from a distance
- E05B53/001—Foot-operation
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- E—FIXED CONSTRUCTIONS
- E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
- E05B—LOCKS; ACCESSORIES THEREFOR; HANDCUFFS
- E05B15/00—Other details of locks; Parts for engagement by bolts of fastening devices
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- E—FIXED CONSTRUCTIONS
- E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
- E05B—LOCKS; ACCESSORIES THEREFOR; HANDCUFFS
- E05B65/00—Locks or fastenings for special use
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- Mechanical Control Devices (AREA)
Abstract
The invention relates to a pedal control type mortise lock and a cable trench cover plate, the pedal control type mortise lock comprises: the device comprises a back plate, a push plate, a connecting rod, a sliding lock core and a locking tongue; the back plate is fixed on a top cover on the cable trench cover plate, a movable groove is formed in the back plate, the pushing plate is arranged on one side of the back plate, one end of the connecting rod is connected with the pushing plate, and the other end of the connecting rod penetrates through the movable groove and then is connected with the sliding lock core; the locking tongue is fixed on the base on the cable trench cover plate, and the position of the locking tongue corresponds to the position of the sliding lock core. The above-mentioned scheme that this application provided drives the slurcam motion through external force, and the slurcam passes through the connecting rod motion, and the connecting rod drives the motion of slip lock core to make the slip lock core be in primary importance or second position, when the primary importance, the slip lock core will tightly lock with the locking tongue, and when the second position, the slip lock core will separate with the locking tongue.
Description
Technical Field
The invention relates to the technical field of safety tools, in particular to a pedal control type mortise lock and a cable trench cover plate.
Background
The foot control type mortise lock is an equipment device which can be installed on a cable trench cover and is generally used for single-foot control unlocking and locking, but the existing foot control type mortise lock has the following problems: the outward appearance is protruding, can not adapt to and install in cable trench cover, though some models can install, but structure and pleasing to the eye influence greatly, and need operate with the hand at every turn, waste time and energy, and simultaneously, current mortise lock preparation material difference, and do not have pressure spring elasticity, can not guarantee under the normal condition, overall structure is in the function of shutting the state. The application requirements of the cable trench cover plate cannot be met.
Disclosure of Invention
Accordingly, it is desirable to provide a foot-operated mortise lock and a cable duct cover for solving the problem of inconvenience in operation of the conventional foot-operated mortise lock.
The invention provides a pedal control type mortise lock, comprising: the device comprises a back plate, a push plate, a connecting rod, a sliding lock core and a locking tongue;
the back plate is fixed on a top cover on the cable trench cover plate, a movable groove is formed in the back plate, the pushing plate is arranged on one side of the back plate, one end of the connecting rod is connected with the pushing plate, and the other end of the connecting rod penetrates through the movable groove and then is connected with the sliding lock core;
the locking tongue is fixed on a base on the cable trench cover plate, and the position of the locking tongue corresponds to the position of the sliding lock cylinder;
the sliding lock core is provided with a first position and a second position which are opposite to the movement of the locking tongue, when the sliding lock core is positioned at the first position, the sliding lock core is tightly locked with the locking tongue, and when the sliding lock core is positioned at the second position, the sliding lock core is separated from the locking tongue.
Above-mentioned pedal control type mortise lock convenient operation drives the slurcam motion through external force, and the slurcam passes through the connecting rod motion, and the connecting rod drives the motion of slip lock core to make the slip lock core be in primary importance or second place, when the primary importance, the slip lock core will tightly lock with the locking tongue, and when the second place, the slip lock core will separate with the locking tongue.
In one embodiment, the movable groove comprises a first clamping groove, a second clamping groove and a limiting protrusion, the first clamping groove is communicated with the second clamping groove, and the limiting protrusion is arranged between the first clamping groove and the second clamping groove;
when the sliding lock cylinder is located at a first position, the connecting rod is located in the first clamping groove, and when the sliding lock cylinder is located at a second position, the connecting rod is located in the second clamping groove.
In one embodiment, the sliding lock further comprises a connecting sleeve, one end of the connecting rod, which is far away from the pushing plate, is connected with the connecting sleeve, and the first cross rod and the second cross rod on the sliding lock core are movably connected with the connecting sleeve respectively.
In one embodiment, the back plate comprises a connecting sleeve, and is characterized by further comprising a limiting rod and a limiting groove, wherein the limiting rod is arranged on the connecting sleeve, the limiting groove is arranged on one side, away from the push plate, of the back plate, and the limiting rod is far away from one end of the connecting sleeve and is arranged in the limiting groove.
In one embodiment, the sliding lock further comprises an elastic component, the elastic component is arranged on one side of the back plate, which faces away from the pushing plate, and the elastic component is connected with the sliding lock cylinder;
when the sliding lock cylinder is in a first position, the elastic component pushes the sliding lock cylinder to move so that the sliding lock cylinder is tightly locked with the locking tongue; when the sliding lock cylinder is located at the second position, the sliding lock cylinder compresses the elastic component, and the sliding lock cylinder is separated from the locking tongue.
In one embodiment, the elastic assembly comprises a pressure spring guide rod, a pressure spring, a first fixed seat and a second fixed seat;
the first fixing seat is arranged on one side, away from the second cross rod, of the first cross rod on the sliding lock cylinder, the second fixing seat is arranged on one side, away from the first cross rod, of the second cross rod on the sliding lock cylinder, one end of the pressure spring guide rod is connected with the first fixing seat, and the other end of the pressure spring guide rod penetrates through the first cross rod and the second cross rod in sequence and then is connected with the second fixing seat;
the compression spring is sleeved on the compression spring guide rod, one end of the compression spring is abutted to the first fixing seat, and the other end of the compression spring is abutted to the first cross rod.
In one embodiment, the sliding lock further comprises a positioning sleeve, a vertical rod sleeve on the sliding lock core is arranged on the positioning sleeve, the vertical rod can move along the axial direction, and the same end of the first cross rod and the same end of the second cross rod are connected with the vertical rod.
In one embodiment, the vertical rod is in clearance fit with the shaft hole on the positioning sleeve.
In one embodiment, the cable trench cover further comprises a mounting seat, wherein the mounting seat is arranged on the back plate, and the back plate is connected with the top cover on the cable trench cover through the mounting seat.
The invention also provides a cable trench cover, which comprises the pedal control type mortise lock according to any one of the embodiment descriptions, wherein the pedal control type mortise lock is arranged on the cable trench cover body.
Drawings
FIG. 1 is a schematic view of a foot-operated mortise lock according to an embodiment of the present invention;
fig. 2 is a schematic view of a tongue locking device according to an embodiment of the invention.
The figures are labeled as follows:
101. a back plate; 10101. a first card slot; 10102. a second card slot; 10103. a limiting bulge; 102. a push plate; 103. connecting sleeves; 104. a connecting rod; 105. a sliding lock cylinder; 1051. a first cross bar; 1052. a second cross bar; 106. a limiting rod; 107. a limiting groove; 108. a positioning sleeve; 109. a pressure spring guide rod; 1010. a pressure spring; 1011. a first fixed seat; 1012. a second fixed seat; 1013. a mounting seat; 20. locking the tongue; 201. and fixing the head.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.
As shown in fig. 1 in combination with fig. 2, in one embodiment of the present invention, there is provided a foot-operated mortise lock comprising: the cable trench cover comprises a back plate 101, a push plate 102, a connecting rod 104, a sliding lock core 105 and a locking tongue 20, wherein the back plate 101 is fixed on a top cover on the cable trench cover plate, a movable groove is formed in the back plate 101, the push plate 102 is arranged on one side of the back plate 101, one end of the connecting rod 104 is connected with the push plate 102, and the other end of the connecting rod passes through the movable groove and then is connected with the sliding lock core 105; the locking tongue 20 is fixed on a base on the cable trench cover plate, and the position of the locking tongue 20 corresponds to the position of the sliding lock core 105; the sliding lock core 105 has a first position and a second position which are both movable relative to the locking tongue 20, when the sliding lock core 105 is in the first position, the sliding lock core 105 is locked with the locking tongue 20, and when the sliding lock core 105 is in the second position, the sliding lock core 105 is separated from the locking tongue 20.
Adopt above-mentioned technical scheme, drive the slurcam motion through external force, the slurcam passes through the connecting rod motion, the connecting rod drives the motion of slip lock core, so that the slip lock core is in primary importance or second position, when primary importance, the slip lock core will tightly lock with the locking tongue, at this moment, the top cap on the cable trench cover tightly locks on the base on the cable trench cover, when the second place, the slip lock core will separate with the locking tongue, at this moment, the base on the relative cable trench cover of top cap on the cable trench cover is opened.
In some embodiments, as shown in fig. 1, the movable groove in the present application includes a first locking groove 10101, a second locking groove 10102, and a limiting protrusion 10103, wherein the first locking groove 10101 and the second locking groove 10102 are communicated, and the limiting protrusion 10103 is disposed between the first locking groove 10101 and the second locking groove 10102; when the sliding lock cylinder 105 is in the first position, the connecting rod 104 is located in the first locking groove 10101, and when the sliding lock cylinder 105 is in the second position, the connecting rod 104 is located in the second locking groove 10102.
Specifically, when the push plate 102 drives the connecting rod 104 to move into the first engaging groove 10101, the sliding lock cylinder 105 is located at the first position, and when the push plate 102 drives the connecting rod 104 to move into the second engaging groove 10102, the sliding lock cylinder 105 is located at the second position.
In some embodiments, as shown in fig. 1, the foot-operated mortise lock of the present application further includes a connecting sleeve 103, wherein the connecting rod 104 is connected to the connecting sleeve 103 at an end away from the push plate 102, and the first cross bar 1051 and the second cross bar 1052 of the sliding lock core 105 are movably connected to the connecting sleeve 103, respectively.
In some embodiments, as shown in fig. 1, the pedal-controlled mortise lock further includes a limiting rod 106 and a limiting groove 107, the limiting rod 106 is disposed on the connecting sleeve 103, the limiting groove 107 is disposed on a side of the back plate 101 facing away from the push plate 102, and an end of the limiting rod 106 far away from the connecting sleeve 103 is disposed in the limiting groove 107.
Specifically, when the pushing plate 102 drives the connecting rod 104 to move in the first engaging groove 10101 and the second engaging groove 10102, the connecting rod 104 indirectly drives the limiting rod 106 to move in the limiting groove 107 through the connecting sleeve 103.
In some embodiments, the foot-operated mortise lock of the present application further comprises an elastic member disposed on a side of the back plate 101 facing away from the push plate 102, the elastic member being connected to the sliding lock cylinder 105; when the sliding lock cylinder 105 is in the first position, the elastic component pushes the sliding lock cylinder 105 to move, so that the sliding lock cylinder 105 is tightly locked with the locking tongue 20; when slide lock core 105 is in the second position, slide lock core 105 compresses the resilient assembly and slide lock core 105 disengages from locking tongue 20.
Specifically, the elastic assembly includes a pressure spring guide rod 109, a pressure spring 1010, a first fixing seat 1011 and a second fixing seat 1012, wherein the first fixing seat 1011 is disposed on a side of the first cross bar 1051 on the sliding lock core 105 away from the second cross bar 1052, the second fixing seat 1012 is disposed on a side of the second cross bar 1052 on the sliding lock core 105 away from the first cross bar 1051, one end of the pressure spring guide rod 109 is connected with the first fixing seat 1011, and the other end of the pressure spring guide rod passes through the first cross bar 1051 and the second cross bar 1052 in sequence and then is connected with the second fixing seat 1012; the pressure spring 1010 is sleeved on the pressure spring guide rod 109, one end of the pressure spring 1010 is abutted to the first fixing seat 1011, and the other end of the pressure spring 1010 is abutted to the first cross rod 1051.
When using, after the pushing board 102 drives the connecting rod 104 and moves to first draw-in groove 10101, the pressure spring 1010 is in the state of stretching out, first horizontal pole 1051 on the slip lock core 105 is to keeping away from the one side motion of first fixing base 1011 under the effort of pressure spring 1010, at this moment, montant on the slip lock core 105 cooperates with the fixed head 201 on the locking tongue 20, after the pushing board 102 drives the connecting rod 104 and moves to in the second draw-in groove 10102, montant on the slip lock core 105 is separated with the fixed head 201 on the locking tongue 20, first horizontal pole 1051 compression pressure spring 1010.
In some embodiments, as shown in fig. 1, the pedal-controlled mortise lock in the present application further includes a positioning sleeve 108, a vertical rod of the sliding lock core 105 is sleeved on the positioning sleeve 108, the vertical rod is in clearance fit with a shaft hole of the positioning sleeve 108, the vertical rod can move axially, and the same end of the first cross rod 1051 and the same end of the second cross rod 1052 are both connected to the vertical rod.
In some embodiments, as shown in fig. 1, the foot-operated mortise lock of the present application further includes a mounting seat 1013, the mounting seat 1013 is disposed on the back plate 101, and the back plate 101 is connected to a top cover of the cable duct cover through the mounting seat 1013.
The invention also provides a cable trench cover, which comprises the pedal control type mortise lock according to any one of the embodiments of the application, wherein the pedal control type mortise lock is arranged on the cable trench cover body.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A foot-operated mortise lock comprising: the device comprises a back plate (101), a push plate (102), a connecting rod (104), a sliding lock core (105) and a locking tongue (20);
the back plate (101) is fixed on a top cover on a cable trench cover plate, a movable groove is formed in the back plate (101), the pushing plate (102) is arranged on one side of the back plate (101), one end of the connecting rod (104) is connected with the pushing plate (102), and the other end of the connecting rod penetrates through the movable groove and then is connected with the sliding lock cylinder (105);
the locking tongue (20) is fixed on a base on the cable trench cover plate, and the position of the locking tongue (20) corresponds to the position of the sliding lock cylinder (105);
the sliding lock cylinder (105) is provided with a first position and a second position which are opposite to the movement of the locking tongue (20), when the sliding lock cylinder (105) is located at the first position, the sliding lock cylinder (105) is tightly locked with the locking tongue (20), and when the sliding lock cylinder (105) is located at the second position, the sliding lock cylinder (105) is separated from the locking tongue (20).
2. The foot-controlled mortise lock according to claim 1, characterized in that the movable groove includes a first catching groove (10101), a second catching groove (10102), and a stopper protrusion (10103), the first catching groove (10101) and the second catching groove (10102) communicate, the stopper protrusion (10103) is disposed between the first catching groove (10101) and the second catching groove (10102);
when the sliding lock cylinder (105) is in a first position, the connecting rod (104) is located in the first clamping groove (10101), and when the sliding lock cylinder (105) is in a second position, the connecting rod (104) is located in the second clamping groove (10102).
3. Pedal-controlled mortise lock according to claim 1 characterized in that it further comprises a connecting sleeve (103), the connecting rod (104) is connected to the connecting sleeve (103) at an end away from the push plate (102), and the first and second cross bars (1051, 1052) on the sliding lock cylinder (105) are movably connected to the connecting sleeve (103), respectively.
4. Pedal-control mortise lock according to claim 3, characterized in that it further comprises a stop lever (106) and a stop groove (107), the stop lever (106) being arranged on the connection sleeve (103), the stop groove (107) being arranged on the side of the back plate (101) facing away from the push plate (102), the end of the stop lever (106) facing away from the connection sleeve (103) being in the stop groove (107).
5. Pedal-control mortise lock according to claim 1 characterized in that it further comprises an elastic assembly arranged on the side of the back plate (101) facing away from the push plate (102), the elastic assembly being connected with the sliding lock cylinder (105);
when the sliding lock cylinder (105) is in a first position, the elastic component pushes the sliding lock cylinder (105) to move so that the sliding lock cylinder (105) is tightly locked with the locking tongue (20); when the sliding lock cylinder (105) is in the second position, the sliding lock cylinder (105) compresses the elastic component, and the sliding lock cylinder (105) is separated from the locking tongue (20).
6. Pedal-control mortise lock according to claim 5 characterized in that the elastic assembly comprises a compression spring guide rod (109), a compression spring (1010), a first anchor (1011) and a second anchor (1012);
the first fixing seat (1011) is arranged on one side, away from the second cross bar (1052), of a first cross bar (1051) on the sliding lock cylinder (105), the second fixing seat (1012) is arranged on one side, away from the first cross bar (1051), of a second cross bar (1052) on the sliding lock cylinder (105), one end of the pressure spring guide rod (109) is connected with the first fixing seat (1011), and the other end of the pressure spring guide rod passes through the first cross bar (1051) and the second cross bar (1052) in sequence and then is connected with the second fixing seat (1012);
the pressure spring (1010) is sleeved on the pressure spring guide rod (109), one end of the pressure spring (1010) is abutted to the first fixing seat (1011), and the other end of the pressure spring (1010) is abutted to the first cross rod (1051).
7. Pedal-control mortise lock according to claim 6 characterized in that it further comprises a locating sleeve (108), wherein a vertical rod on the sliding lock cylinder (105) is sleeved on the locating sleeve (108), the vertical rod is axially movable, and the same end of the first cross rod (1051) and the second cross rod (1052) are connected with the vertical rod.
8. Pedal-control mortise lock according to claim 7, characterized in that the vertical bar is clearance-fitted with an axial hole on the positioning sleeve (108).
9. The foot-operated mortise lock according to claim 1 further comprising a mounting seat (1013), the mounting seat (1013) being disposed on the back plate (101), the back plate (101) being connected to the top cover on the cable duct cover through the mounting seat (1013).
10. A cable trench cover comprising a foot-operated mortise lock according to any one of claims 1 to 9, the foot-operated mortise lock being mounted on a cable trench cover body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110427993.0A CN113266212B (en) | 2021-04-21 | 2021-04-21 | Pedal control type mortise lock and cable trench cover plate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110427993.0A CN113266212B (en) | 2021-04-21 | 2021-04-21 | Pedal control type mortise lock and cable trench cover plate |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113266212A true CN113266212A (en) | 2021-08-17 |
| CN113266212B CN113266212B (en) | 2022-06-21 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110427993.0A Active CN113266212B (en) | 2021-04-21 | 2021-04-21 | Pedal control type mortise lock and cable trench cover plate |
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| Country | Link |
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| CN (1) | CN113266212B (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2080544U (en) * | 1990-10-13 | 1991-07-10 | 刘明尧 | Automatic bolt |
| JP2001140520A (en) * | 1999-11-17 | 2001-05-22 | Hikari Kairiku Sangyo Kk | Lid body locking device for underground common ditch |
| CN202176176U (en) * | 2011-07-27 | 2012-03-28 | 深圳市庆能贸易有限公司 | Cable trench cover plate lock |
| CN205243199U (en) * | 2015-11-23 | 2016-05-18 | 周听昌 | Opening device for hole handhole door of fleing is inboard |
| US20190345740A1 (en) * | 2016-11-14 | 2019-11-14 | Hubbell Incorporated | Latch locking cover for enclosures |
| CN210297209U (en) * | 2019-08-29 | 2020-04-10 | 国网安徽省电力有限公司蚌埠供电公司 | Cable trench cover plate locking and external breaking prevention device |
| CN112324256A (en) * | 2020-12-14 | 2021-02-05 | 江苏东业智能设备有限公司 | Locking device with wedge surface for trench cover plate |
-
2021
- 2021-04-21 CN CN202110427993.0A patent/CN113266212B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2080544U (en) * | 1990-10-13 | 1991-07-10 | 刘明尧 | Automatic bolt |
| JP2001140520A (en) * | 1999-11-17 | 2001-05-22 | Hikari Kairiku Sangyo Kk | Lid body locking device for underground common ditch |
| CN202176176U (en) * | 2011-07-27 | 2012-03-28 | 深圳市庆能贸易有限公司 | Cable trench cover plate lock |
| CN205243199U (en) * | 2015-11-23 | 2016-05-18 | 周听昌 | Opening device for hole handhole door of fleing is inboard |
| US20190345740A1 (en) * | 2016-11-14 | 2019-11-14 | Hubbell Incorporated | Latch locking cover for enclosures |
| CN210297209U (en) * | 2019-08-29 | 2020-04-10 | 国网安徽省电力有限公司蚌埠供电公司 | Cable trench cover plate locking and external breaking prevention device |
| CN112324256A (en) * | 2020-12-14 | 2021-02-05 | 江苏东业智能设备有限公司 | Locking device with wedge surface for trench cover plate |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113266212B (en) | 2022-06-21 |
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