CN112377027B - Double-leaf fireproof door closing sequencer - Google Patents
Double-leaf fireproof door closing sequencer Download PDFInfo
- Publication number
- CN112377027B CN112377027B CN202011411934.6A CN202011411934A CN112377027B CN 112377027 B CN112377027 B CN 112377027B CN 202011411934 A CN202011411934 A CN 202011411934A CN 112377027 B CN112377027 B CN 112377027B
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- Prior art keywords
- door
- passing
- limit
- fixed
- limit switch
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- 238000001125 extrusion Methods 0.000 claims description 8
- 230000009977 dual effect Effects 0.000 claims description 6
- 238000007789 sealing Methods 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 4
- 238000007792 addition Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000009931 harmful effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
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- E—FIXED CONSTRUCTIONS
- E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
- E05F—DEVICES FOR MOVING WINGS INTO OPEN OR CLOSED POSITION; CHECKS FOR WINGS; WING FITTINGS NOT OTHERWISE PROVIDED FOR, CONCERNED WITH THE FUNCTIONING OF THE WING
- E05F5/00—Braking devices, e.g. checks; Stops; Buffers
- E05F5/12—Braking devices, e.g. checks; Stops; Buffers specially for preventing the closing of a wing before another wing has been closed
-
- E—FIXED CONSTRUCTIONS
- E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
- E05F—DEVICES FOR MOVING WINGS INTO OPEN OR CLOSED POSITION; CHECKS FOR WINGS; WING FITTINGS NOT OTHERWISE PROVIDED FOR, CONCERNED WITH THE FUNCTIONING OF THE WING
- E05F5/00—Braking devices, e.g. checks; Stops; Buffers
- E05F5/06—Buffers or stops limiting opening of swinging wings, e.g. floor or wall stops
- E05F5/08—Buffers or stops limiting opening of swinging wings, e.g. floor or wall stops with springs
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- E—FIXED CONSTRUCTIONS
- E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
- E06B—FIXED OR MOVABLE CLOSURES FOR OPENINGS IN BUILDINGS, VEHICLES, FENCES OR LIKE ENCLOSURES IN GENERAL, e.g. DOORS, WINDOWS, BLINDS, GATES
- E06B3/00—Window sashes, door leaves, or like elements for closing wall or like openings; Layout of fixed or moving closures, e.g. windows in wall or like openings; Features of rigidly-mounted outer frames relating to the mounting of wing frames
- E06B3/32—Arrangements of wings characterised by the manner of movement; Arrangements of movable wings in openings; Features of wings or frames relating solely to the manner of movement of the wing
- E06B3/34—Arrangements of wings characterised by the manner of movement; Arrangements of movable wings in openings; Features of wings or frames relating solely to the manner of movement of the wing with only one kind of movement
- E06B3/36—Arrangements of wings characterised by the manner of movement; Arrangements of movable wings in openings; Features of wings or frames relating solely to the manner of movement of the wing with only one kind of movement with a single vertical axis of rotation at one side of the opening, or swinging through the opening
- E06B3/362—Double winged doors or windows
-
- E—FIXED CONSTRUCTIONS
- E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
- E06B—FIXED OR MOVABLE CLOSURES FOR OPENINGS IN BUILDINGS, VEHICLES, FENCES OR LIKE ENCLOSURES IN GENERAL, e.g. DOORS, WINDOWS, BLINDS, GATES
- E06B5/00—Doors, windows, or like closures for special purposes; Border constructions therefor
- E06B5/10—Doors, windows, or like closures for special purposes; Border constructions therefor for protection against air-raid or other war-like action; for other protective purposes
- E06B5/16—Fireproof doors or similar closures; Adaptations of fixed constructions therefor
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- E—FIXED CONSTRUCTIONS
- E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
- E05Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES E05D AND E05F, RELATING TO CONSTRUCTION ELEMENTS, ELECTRIC CONTROL, POWER SUPPLY, POWER SIGNAL OR TRANSMISSION, USER INTERFACES, MOUNTING OR COUPLING, DETAILS, ACCESSORIES, AUXILIARY OPERATIONS NOT OTHERWISE PROVIDED FOR, APPLICATION THEREOF
- E05Y2900/00—Application of doors, windows, wings or fittings thereof
- E05Y2900/10—Application of doors, windows, wings or fittings thereof for buildings or parts thereof
- E05Y2900/13—Type of wing
- E05Y2900/132—Doors
- E05Y2900/134—Fire doors
Landscapes
- Engineering & Computer Science (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Special Wing (AREA)
Abstract
The invention discloses a door closing sequencer for a double-leaf fireproof door, which comprises a fixed door, a passing door and a door frame, wherein the outer sides of the fixed door and the passing door are hinged with the door frame, the upper part of the outer side of the door frame is provided with two automatic door closers, the two automatic door closers are respectively connected with the fixed door and the passing door through draw bars, the outer side of the passing door is provided with a handle, the door edge of the fixed door is provided with a closed edge, the closed edge covers the outer side of the passing door, the upper part of the inner side of the door frame is provided with two limiters, sliding shafts are arranged in the limiters, the sliding shafts penetrate through the two limiters, the right ends of the sliding shafts are connected with a limit switch, and elastic parts are sleeved on the sliding shafts. Under the condition of not damaging and replacing the existing fireproof door, the design of the invention is arranged on the fireproof door and the door frame to realize the sequence switch required by the national standard and reduce the noise, thereby prolonging the service life of the fireproof door, solving the technical problems in the prior art and obtaining ideal effects.
Description
Technical Field
The invention belongs to the technical field of fireproof doors, and particularly relates to a door closing sequencer for a double-leaf fireproof door.
Background
The ' double-door installation sequencer ' is specified according to 5.3.2 of GB 50877-2014 fireproof rolling curtain, fireproof door and fireproof window construction and acceptance standard '.
The existing fire-proof doors are in cost consideration and are usually only provided with a closed edge at the closed position of a fixed door to realize sequential opening and closing, and if the closed edge exists, the closed edge on the fixed door can not be closed due to the blocking of the closed edge on the fixed door if the passing door is closed firstly and then the fixed door is closed.
The technical problem that the scheme among the prior art has following, when closing behind the fixed door, airtight limit and the quick striking of passing door, collision produce huge noise, have the problem of disturbing residents, also produce harmful effects to the life who prevents fire door.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides a double-leaf fireproof door closing sequencer, which can realize the sequence switch required by national standards and reduce noise by installing the design of the invention on a fireproof door and a door frame under the condition of not damaging and replacing the existing fireproof door, prolongs the service life of the fireproof door, solves the technical problems in the prior art, and obtains ideal effects.
In order to achieve the purpose, the invention adopts the technical scheme that:
a door closing sequence device for a double-leaf fireproof door comprises a fixed door, a passing door and a door frame, wherein the outer sides of the fixed door and the passing door are hinged with the door frame, two automatic door closers are arranged on the upper portion of the outer side of the door frame and are respectively connected with the fixed door and the passing door through a traction rod, a handle is arranged on the outer side of the passing door, a sealing edge is arranged on the door edge of the fixed door and covers the outer side of the passing door, two limiting devices are arranged on the upper portion of the inner side of the door frame and comprise a right limiting device I and a left limiting device II, a sliding shaft is arranged in each limiting device and penetrates through the two limiting devices, the right end of the sliding shaft is connected with a limiting switch, an elastic piece is sleeved on the sliding shaft, one end of the elastic piece is connected with the right limiting device, the other end of the elastic piece is connected with the limiting switch, a passing groove is arranged on the limiting switch, the upper portion of the inner side of the passing door is connected with a limiting rod, the upper portion of the inner side of the fixed door is connected with a control switch, control switch pairs with the sliding shaft left end, and control switch promotes the sliding shaft and slides to the right side when the fixed door is closed, and limit switch slides right, and the gag lever post slides to passing through the inslot, and current door can be closed, and when the fixed door was opened, the elastic component drove limit switch and removes left, shifts out the position of gag lever post through the groove, and the gag lever post on the current door is blocked by limit switch.
The gag lever post includes pivot, connecting rod, and the connecting rod is "L" type, and connecting rod one end is connected with current door, and the pivot is emboliaed to another section of connecting rod, and the pivot can rotate, and the pivot is connected with limit switch contact.
Control switch locates the fixed door and is close to current door side, and the gag lever post is located current door and is close to right side door frame department.
The sliding shaft is sleeved with a limiting ring, the limiting ring is arranged on the right side of the second limiting device and is fixedly connected with the sliding shaft, and after the fixed door is opened, the limiting ring limits the position of the limiting switch to move out of the limiting rod.
The sliding shaft is a polygonal shaft which is a triangular shaft or a hexagonal shaft.
The limit switch is provided with a buffer area, the buffer area is arranged on the right side of the through groove, and a rubber buffer layer is arranged on the buffer area.
The control switch comprises a connecting end and an extrusion end, the connecting end is connected with the fixed door, the extrusion end is wedge-shaped, and when the fixed door is closed, the extrusion end extrudes the sliding shaft to the right side a little bit.
The elastic element is a spring.
The rear side of the limit switch is attached to the door frame.
The invention has the beneficial effects that:
1) under the condition of not damaging and replacing the existing fireproof door, the design of the invention is arranged on the fireproof door and the door frame to realize the sequence switch required by the national standard and reduce the noise, thereby prolonging the service life of the fireproof door, solving the technical problems in the prior art and obtaining ideal effects.
2) When the fixed door is in a closed state, the limiting rod is arranged in the passing groove of the limiting switch, the control switch abuts against the sliding shaft and cannot move, and the passing door can be opened and closed freely. When the fixed door is opened, the control switch is moved away, the elastic piece drives the limit switch to move leftwards, the limit rod on the passing door cannot penetrate through the passing groove, the limit rod is blocked by the limit switch, and the passing door cannot be completely closed. The door is required to be completely closed, so that the control switch extrudes the sliding shaft to slide rightwards, the limiting rod enters the passing groove, and the passing door can be closed. Thereby realizing the door closing sequence function that the passing door can be closed only by closing the fixed door.
3) The pivot can reduce the frictional force of gag lever post and limit switch, and the sliding shaft removes, closes the door of passing smoothly.
4) The sliding shaft is a polygonal shaft, and can prevent the sliding shaft and the limit switch from rotating.
5) The rear side of the limit switch is attached to the door frame, so that the limit switch can bear larger impact from the limit rod.
6) The rubber buffer layer can protect gag lever post and limit switch, reduces the impact force, noise reduction.
7) The limiting rod is arranged at the position, close to the right side door frame, of the passing door, the closing amplitude of the passing door can be reduced, and the impact force and the generated noise received by the limiting switch are reduced.
Drawings
Figure 1 is a front schematic view of a dual fire door closing sequencer according to the present invention.
Figure 2 is a back view of a dual fire door closedown sequencer according to the present invention.
FIG. 3 is a schematic view of a dual-leaf fire door closing sequencer control switch according to the present invention.
FIG. 4 is a schematic diagram of a dual-leaf fire door closing sequencer limit switch according to the present invention.
In the figure, 1, a pass gate; 2. an automatic door closer; 3. a door frame; 4. a fixed door; 5. sealing the edges; 6. a sliding shaft; 7. a control switch; 8. a second limiter; 9. a limiting ring; 10. a first limiter; 11. an elastic member; 12. a limit switch; 13. a buffer area; 14. a limiting rod;
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, are merely for convenience of description of the present invention, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.
Example 1
Referring to fig. 1-4, a two-leaf fireproof door closing sequencer comprises a fixed door 4, a passing door 1 and a door frame 3, wherein the fixed door 4 and the passing door 1 are hinged to the door frame 3, two automatic door closers 2 are arranged on the upper portion of the outer side of the door frame 3, the two automatic door closers 2 are respectively connected with the fixed door 4 and the passing door 1 through draw bars, a handle is arranged on the outer side of the passing door 1, a closed edge 5 is arranged on the door edge of the fixed door 4, the closed edge 5 covers the outer side of the passing door 1, two stoppers are arranged on the upper portion of the inner side of the door frame 3, a sliding shaft 6 is arranged in each stopper, the sliding shaft 6 passes through the two stoppers, the right end of the sliding shaft 6 is connected with a limit switch 12, an elastic member 11 is sleeved on the sliding shaft 6, the two stoppers comprise a right stopper I and a left stopper II, one end of the elastic member 11 is connected with a right stopper I10, the other end of the elastic member 11 is connected with the limit switch 12, be equipped with on limit switch 12 and pass through the groove, the inboard upper portion of passing door 1 is connected with gag lever post 14, the inboard upper portion of fixed door 4 is connected with control switch 7, control switch 7 pairs with 6 left ends of sliding shaft, control switch 7 promotes sliding shaft 6 and slides to the right side when fixed door 4 closes, limit switch 12 slides right, gag lever post 14 slides to passing through the inslot, passing door 1 can close, when fixed door 4 opens, elastic component 11 drives limit switch 12 and moves left, shift out the position of gag lever post 14 through the groove, gag lever post 14 on passing door 1 is kept off by limit switch 12.
Under the condition of not damaging and replacing the existing fireproof door, the design of the invention is arranged on the fireproof door and the door frame 3 to realize the sequence switch required by the national standard and reduce the noise, thereby prolonging the service life of the fireproof door, solving the technical problems in the prior art and obtaining ideal effects.
When the fixed door 4 is in a door closing state, the limiting rod 14 is arranged in the passing groove of the limiting switch 12, the control switch 7 is propped against the sliding shaft 6 and cannot move, and the passing door 1 can be freely opened and closed. When the fixed door 4 is opened, the control switch 7 is moved away, the elastic piece 11 drives the limit switch 12 to move leftwards, the limit rod 14 on the passing door 1 cannot penetrate through the passing groove, the limit rod 14 is blocked by the limit switch 12, and the passing door 1 cannot be completely closed. The access door 1 can be closed only by completely closing the fixed door 4 to enable the control switch 7 to press the sliding shaft 6 to slide rightwards, and enabling the limiting rod 14 to enter the passing groove. The door closing sequence function is thus achieved in which the fixed door 4 must be closed first to close the access door 1.
The limiting rod 14 comprises a rotating shaft and a connecting rod, the connecting rod is L-shaped, one end of the connecting rod is connected with the passing door 1, the rotating shaft is sleeved in the other section of the connecting rod, the rotating shaft can rotate, and the rotating shaft is in contact connection with the limiting switch 12.
The friction force between the limiting rod 14 and the limiting switch 12 can be reduced by the rotating shaft, and the sliding shaft 6 moves to smoothly close the passing door 1.
The control switch 7 is arranged on the fixed door 4 close to the right door frame 3, and the limiting rod 14 is arranged on the right door frame 3 close to the fixed door 1.
The limiting rod 14 is arranged at the position, close to the right side doorframe 3, of the passing door 1, so that the closing amplitude of the passing door 1 can be reduced, and the impact force and the generated noise received by the limiting switch 12 can be reduced.
The sliding shaft is sleeved with a limiting ring 9, the limiting ring 9 is arranged on the right side of the second limiter 8, the limiting ring 9 is fixedly connected with the sliding shaft, and after the fixed door 4 is opened, the limiting ring 9 limits the position of the limiting switch 12 to move out of the limiting rod 14.
The sliding shaft is a polygonal shaft which is a triangular shaft or a hexagonal shaft.
The slide shaft is a polygonal shaft, and the slide shaft and the limit switch 12 can be prevented from rotating.
The limit switch 12 is provided with a buffer zone 13, the buffer zone 13 is arranged on the right side of the through groove, and the buffer zone 13 is provided with a rubber buffer layer.
The rubber buffer layer can protect the limiting rod 14 and the limiting switch 12, reduce impact force and reduce noise.
The control switch 7 comprises a connecting end and an extrusion end, the connecting end is connected with the fixed door 4, the extrusion end is wedge-shaped, and when the fixed door 4 is closed, the sliding shaft 6 is extruded to the right side by one point at the extrusion end.
The elastic member 11 is a spring.
The rear side of the limit switch 12 is jointed with the door frame 3.
The rear side of the limit switch 12 is attached to the door frame 3, so that the limit switch can bear larger impact from the limit rod 14.
The foregoing is merely exemplary and illustrative of the present invention and various modifications, additions and substitutions may be made by those skilled in the art to the specific embodiments described without departing from the scope of the present invention as defined in the accompanying claims.
Claims (7)
1. A door closing sequence device for a double-leaf fireproof door is characterized by comprising a fixed door, a passing door and a door frame, wherein the outer sides of the fixed door and the passing door are hinged with the door frame, two automatic door closers are arranged on the upper portion of the outer side of the door frame and are respectively connected with the fixed door and the passing door through traction rods, a handle is arranged on the outer side of the passing door, a sealing edge is arranged on the door edge of the fixed door and covers the outer side of the passing door, two stoppers are arranged on the upper portion of the inner side of the door frame, sliding shafts are arranged in the stoppers and penetrate through the two stoppers and comprise a first right stopper and a second left stopper, the right end of each sliding shaft is connected with a limit switch, an elastic part is sleeved on each sliding shaft, one end of each elastic part is connected with the first right stopper, the other end of each elastic part is connected with the limit switch, a passing groove is formed in the limit switch, and the upper portion of the inner side of the passing door is connected with a limit rod, the upper part of the inner side of the fixed door is connected with a control switch, the control switch is matched with the left end of the sliding shaft, when the fixed door is closed, the control switch pushes the sliding shaft to slide towards the right side, the limit switch slides towards the right side, the limit rod slides into the through groove, the passing door can be closed, when the fixed door is opened, the limit switch is driven by the elastic part to move towards the left side, the limit rod moves out of the position of the limit rod through the groove, the limit rod on the passing door is blocked by the limit switch, the sliding shaft is sleeved with a limit ring which is arranged at the right side of the two limit devices, the limit ring is fixedly connected with the sliding shaft, after the fixed door is opened, the limit ring limits the limit switch to move out of the position of the limit rod, the limit rod comprises a rotating shaft and a connecting rod, the connecting rod is L-shaped, one end of the connecting rod is connected with the passing door, the other section of the connecting rod is sleeved with the rotating shaft, the rotating shaft can rotate, the rotating shaft is in contact connection with the limit switch, the control switch comprises a connecting end and an extruding end, the connecting end is connected with the fixed door, the extrusion end is wedge-shaped, and when the fixed door is closed, the extrusion end extrudes the sliding shaft to the right side little by little.
2. The dual fire door closing sequencer of claim 1, wherein the control switch is disposed on a side of the fixed door adjacent the passing door, and the position limiting lever is disposed on the passing door adjacent the right side doorframe.
3. The dual fire door closing sequencer of claim 1, wherein the sliding axis is a polygonal axis.
4. The dual fire door closing sequencer of claim 1, wherein the limit switch has a buffer area, the buffer area being disposed on a right side of the pass through slot, the buffer area having a rubber buffer layer disposed thereon.
5. A two fire door closing sequencer, as claimed in claim 1, wherein said resilient member is a spring.
6. The dual fire door closing sequencer of claim 1, wherein a rear side of the limit switch engages the door frame.
7. The fire door closing sequencer of claim 3, wherein said polygonal axis is a three-edged axis or a six-edged axis.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011411934.6A CN112377027B (en) | 2020-12-04 | 2020-12-04 | Double-leaf fireproof door closing sequencer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011411934.6A CN112377027B (en) | 2020-12-04 | 2020-12-04 | Double-leaf fireproof door closing sequencer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112377027A CN112377027A (en) | 2021-02-19 |
| CN112377027B true CN112377027B (en) | 2022-09-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011411934.6A Active CN112377027B (en) | 2020-12-04 | 2020-12-04 | Double-leaf fireproof door closing sequencer |
Country Status (1)
| Country | Link |
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| CN (1) | CN112377027B (en) |
Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA630811A (en) * | 1961-11-14 | S. Lindsey Eric | Doors | |
| DE3604091A1 (en) * | 1986-02-08 | 1987-08-13 | Dorma Gmbh & Co Kg | Closing-sequence regulating device for a two-winged door |
| DE19507378A1 (en) * | 1995-02-07 | 1996-08-08 | Dorma Gmbh & Co Kg | Sequencing mechanism for shutting two-leaf doors |
| CN2238300Y (en) * | 1995-10-06 | 1996-10-23 | 董士聪 | Closing sequencer for fire-proof door |
| CN2660067Y (en) * | 2003-09-30 | 2004-12-01 | 厦门市元美实业有限公司 | Door closing sequence of firedoor |
| CN101429837A (en) * | 2008-12-12 | 2009-05-13 | 重庆美心(集团)有限公司 | Concealed door opening/closing sequence device |
| CN101748949A (en) * | 2008-12-09 | 2010-06-23 | 台湾福兴工业股份有限公司 | Door closing sequence controller |
| CN202500429U (en) * | 2012-03-20 | 2012-10-24 | 张永梅 | Order door locking device |
| CN203448116U (en) * | 2013-07-16 | 2014-02-26 | 王龙生 | Safety cabinet capable of closing doors automatically in sequence |
| CN106761117A (en) * | 2017-01-03 | 2017-05-31 | 苏州市富尔达科技股份有限公司 | A kind of Syn-position device of closing the door of double door |
| CN111140145A (en) * | 2019-11-18 | 2020-05-12 | 许继集团有限公司 | Fire door is prevented to piping lane |
-
2020
- 2020-12-04 CN CN202011411934.6A patent/CN112377027B/en active Active
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA630811A (en) * | 1961-11-14 | S. Lindsey Eric | Doors | |
| DE3604091A1 (en) * | 1986-02-08 | 1987-08-13 | Dorma Gmbh & Co Kg | Closing-sequence regulating device for a two-winged door |
| DE19507378A1 (en) * | 1995-02-07 | 1996-08-08 | Dorma Gmbh & Co Kg | Sequencing mechanism for shutting two-leaf doors |
| CN2238300Y (en) * | 1995-10-06 | 1996-10-23 | 董士聪 | Closing sequencer for fire-proof door |
| CN2660067Y (en) * | 2003-09-30 | 2004-12-01 | 厦门市元美实业有限公司 | Door closing sequence of firedoor |
| CN101748949A (en) * | 2008-12-09 | 2010-06-23 | 台湾福兴工业股份有限公司 | Door closing sequence controller |
| CN101429837A (en) * | 2008-12-12 | 2009-05-13 | 重庆美心(集团)有限公司 | Concealed door opening/closing sequence device |
| CN202500429U (en) * | 2012-03-20 | 2012-10-24 | 张永梅 | Order door locking device |
| CN203448116U (en) * | 2013-07-16 | 2014-02-26 | 王龙生 | Safety cabinet capable of closing doors automatically in sequence |
| CN106761117A (en) * | 2017-01-03 | 2017-05-31 | 苏州市富尔达科技股份有限公司 | A kind of Syn-position device of closing the door of double door |
| CN111140145A (en) * | 2019-11-18 | 2020-05-12 | 许继集团有限公司 | Fire door is prevented to piping lane |
Also Published As
| Publication number | Publication date |
|---|---|
| CN112377027A (en) | 2021-02-19 |
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