CN112012606A

CN112012606A - Hinge structure for quick escape and escape method

Info

Publication number: CN112012606A
Application number: CN202011008308.2A
Authority: CN
Inventors: 钱芳芳
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-09-23
Filing date: 2020-09-23
Publication date: 2020-12-01

Abstract

The invention belongs to the field of stair doors, and particularly relates to a hinge structure for quick escape and an escape method, wherein the hinge structure for quick escape is used, and is characterized in that: the door comprises a door frame, door leaves, embedded blocks, hinges, a limiting rod A, a limiting groove B, a spring A, a limiting rod B, a spring B, a thin steel wire, a swing rod, a cylinder, an elastic tube, a rotating shaft A, a bevel gear B, an internal thread sleeve, a high-pressure gas container, a bevel gear A, a rotating shaft B and a torsion wheel, wherein the hinged part of each door leaf and the door frame is provided with an embedded groove; according to the invention, the door leaf on the same side can be disconnected from the door frame by manually rotating the torsion wheel on the inner side of the door frame, so that indoor personnel can easily push the door leaf open from inside to outside and realize quick escape, and the escape efficiency of trapped personnel in emergency such as fire is improved.

Description

Hinge structure for quick escape and escape method

Technical Field

The invention belongs to the field of stair doors, and particularly relates to a hinge structure for quick escape and an escape method.

Background

Because the stair door belongs to public facilities, the frequent use of the stair door is easy to cause the problem of blocking or locking. If do not contact the property in time and maintain the stair door that locks dead, under emergency such as great conflagration, the stair door can be because of locking and can't open fast and carry out fast, and poisonous gas, oxygen deficiency, the burn that the conflagration produced and inhale a large amount of steam can lead to a large amount of casualties. Therefore, it is necessary to design a rapid door-breaking device for building doors, aiming at the situation that the building door personnel can not realize rapid door-breaking and escape in time due to the fact that the stair doors which are locked or stuck due to long-time high-frequency use are not maintained and repaired in time under the serious tight conditions such as fire.

The invention designs a hinge structure for quick escape, which solves the problems.

Disclosure of Invention

In order to overcome the defects in the prior art, the invention discloses a hinge structure for quick escape, which is realized by adopting the following technical scheme.

In the description of the present invention, it should be noted that the terms "inside", "outside", "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships that the products of the present invention conventionally use, which are merely for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, or be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.

A hinge structure for quick escape comprises a door frame, door leaves, embedded blocks, hinges, a limiting rod A, a limiting groove B, a spring A, a limiting rod B, a spring B, a thin steel wire, a swing rod, a cylinder, an elastic tube, a rotating shaft A, a bevel gear B, an internal thread sleeve, a high-pressure gas container, a bevel gear A, a rotating shaft B and a torsion wheel, wherein the hinged part of each door leaf and the door frame is provided with an embedded groove; the top and the bottom of each embedded groove are respectively provided with a sliding groove A, and a limiting rod A vertically slides in each sliding groove A; the limiting rod A is matched with a limiting groove A on the same side of the embedded block embedded into the corresponding embedded groove, and the embedded block is hinged with the same side of the door frame through a hinge; each limiting rod A is nested with a spring A for resetting the limiting rod A; a limiting rod B moves horizontally in the sliding groove B on the inner wall of each sliding groove A, the limiting rod B is matched with a limiting groove B on the side wall of the corresponding limiting rod A, and a spring B for resetting the limiting rod B is nested on the limiting rod B.

Each door leaf is internally provided with a cylinder and a replaceable high-pressure gas container; one end of a swing rod swinging around a swing shaft is hinged with the tail end of a piston rod arranged on a sliding plug in the air cylinder, and the other end of the swing rod is connected with the tail ends of four limiting rods B in corresponding door leaves through a plurality of thin steel wires; the swing shaft is matched with a waist round hole on the swing rod; the hollow rotating shaft A which rotates along the circumferential direction and is in axial sliding fit with the two supports arranged in the door leaf is in threaded fit with the internal thread sleeve arranged on the supports; a bevel gear A and a manual torsion wheel are arranged on a rotating shaft B which is rotationally matched with the door leaf, and the bevel gear A is meshed with a bevel gear B which axially slides on the rotating shaft A; one end of the rotating shaft A with the saw teeth is inserted into the circular groove at one end of the high-pressure gas container and is in sealing fit with the inner wall of the circular groove; one end of the rotating shaft A is communicated with an air inlet on the wall of the air cylinder through an elastic pipe.

As a further improvement of the technology, the spring A is positioned in a ring groove A on the inner wall of the corresponding chute A; one end of the spring A is connected with the inner wall of the ring groove A, and the other end of the spring A is connected with a compression spring ring A arranged on the corresponding limiting rod A; the spring B is positioned in the annular groove B on the inner wall of the corresponding sliding groove B; one end of the spring B is connected with the inner wall of the ring groove B, and the other end of the spring B is connected with a compression spring ring B arranged on the corresponding limiting rod B.

As a further improvement of the technology, the hinge is mounted on the embedded block and the door frame through self-tapping bolts; the thin steel wires connected with the swing rods are divided into four and are respectively connected with four limiting rods B in the corresponding door leaves under the guidance of a plurality of guide wheels. The guide wheel ensures that the thin steel wire pulls the limiting rod B to slide in the corresponding ring groove B in the horizontal direction, and reduces the motion resistance of the limiting rod B. The rim of the torsion wheel is provided with anti-skid insections; the torsion wheel is covered by a cover mounted on the inside of the door leaf. The closure prevents children from twisting the twist wheel.

As a further improvement of the technology, a rotating cap is rotatably matched on one end of the rotating shaft A which is not inserted into the circular groove, and the elastic tube is communicated with an air outlet in the middle of the rotating cap; a sealing ring A which is in sealing fit with the outer cylindrical surface of the rotating shaft A is arranged in the annular groove C on the inner wall of the rotating cap; a sealing ring B which is in sealing fit with the outer cylindrical surface of the rotating shaft A is arranged in a ring groove D on the inner wall of the circular groove; a shaft sleeve is nested on the rotating shaft A and is in rotating fit with the two supports through two rolling ball bearings; two guide keys symmetrically arranged on the inner wall of the shaft sleeve axially slide in two guide grooves on the rotating shaft A respectively; the bevel gear B is fixedly arranged on the shaft sleeve. The rotating cap enables relative rotation to be generated between one end of the elastic tube and the rotating shaft A, and the phenomenon that the elastic tube is twisted due to the fact that the elastic tube is fixedly connected with the rotating shaft A in the rotating process of the rotating shaft A to cause reduction of the ventilation effect of the elastic tube is avoided.

As a further improvement of the technology, the high-pressure gas container is arranged in an installation sleeve in the door leaf; the mounting sleeve is internally provided with a spring C which presses the high-pressure gas container against the rotating shaft A; one end of the spring C is connected with the inner wall of the mounting sleeve, and the other end of the spring C is connected with one end of the high-pressure gas container; the circular groove of the high-pressure gas container is tightly pressed against the sawtooth end of the rotating shaft A.

As a further improvement of the technology, the escape method comprises the following steps: open the high-pressure gas container through the rotating pulley, high-pressure gas in the high-pressure gas container gets into the cylinder, the piston rod of cylinder drives the pendulum rod and swings around the pendulum shaft, the pendulum rod passes through four gag lever post B motion in the corresponding door leaf of thin steel wire pulling and removes the restriction to four gag lever post A, four gag lever post A remove the restriction to two embedding pieces in the twinkling of an eye under corresponding spring A's effect respectively, through being connected of disconnection door leaf and door frame, make the door leaf push open from inside to outside, thereby realize fleing.

Compared with the traditional stair door, the door leaf on the same side can be disconnected from the door frame by manually rotating the torsion wheel on the inner side of the door frame, so that indoor personnel can easily push the door leaf open from inside to outside and realize quick escape, and the escape efficiency of trapped personnel in emergency such as fire is improved. The invention has simple structure and better use effect.

Drawings

Fig. 1 is an overall schematic view of the present invention.

Fig. 2 is a schematic overall cross-sectional view from two perspectives of the present invention.

Fig. 3 is a schematic cross-sectional view of the embedded block, the limiting rod a and the limiting rod B.

FIG. 4 is a schematic section view showing the cooperation of a limiting rod A, a limiting rod B, a thin steel wire, a guide wheel, a swing rod, a piston rod, a cylinder, an elastic tube, a rotary cap, a rotating shaft A, a high-pressure gas container, a spring C and a mounting box.

FIG. 5 is a schematic cross-sectional view of the saw tooth in cooperation with a high pressure gas container.

Fig. 6 is a schematic cross-sectional view of the combination of the rotary cap, the rotary shaft a, the shaft sleeve, the ball bearing, the support, the internal thread sleeve and the high-pressure gas container.

FIG. 7 is a schematic cross-sectional view of the combination of the swing link, the piston rod, the sliding plug, the cylinder, the elastic tube, the rotating cap and the rotating shaft A.

Fig. 8 is a schematic cross-sectional view of the door frame, hinge, insert and door leaf.

FIG. 9 is a schematic cross-sectional view of the torsion wheel, the rotating shaft B, the bevel gear A, the bevel gear B, the shaft sleeve A and the rotating shaft A in cooperation.

Fig. 10 is a sectional view of the door leaf and the door leaf.

Fig. 11 is a partial sectional view of the door leaf.

Fig. 12 is a schematic cross-sectional view of an insert and its insert.

Fig. 13 is a schematic sectional view of the stopper rod a.

FIG. 14 is a schematic cross-sectional view of a high pressure gas vessel.

Fig. 15 is a schematic sectional view of the rotation axis a.

FIG. 16 is a schematic cross-sectional view of a spin cap.

Number designation in the figures: 1. a door frame; 2. a door leaf; 3. a groove is embedded; 4. a chute A; 5. a ring groove A; 6. a chute B; 7. a ring groove B; 8. embedding a block; 9. a limiting groove A; 10. a hinge; 11. a bolt; 12. a limiting rod A; 13. a limiting groove B; 14. a spring A; 15. a compression spring ring A; 16. a limiting rod B; 17. a spring B; 18. a compression spring ring B; 19. thin steel wires; 20. a guide wheel; 21. a swing rod; 22. a lumbar circular hole; 23. a pendulum shaft; 24. a piston rod; 25. a sliding plug; 26. a cylinder; 27. an air inlet; 28. an elastic tube; 29. rotating the cap; 30. a ring groove C; 31. an air outlet; 32. a sealing ring A; 33. a rotating shaft A; 34. a guide groove; 36. saw teeth; 37. a shaft sleeve; 38. a guide key; 39. a ball bearing; 40. a support; 41. a bevel gear B; 42. an internal thread sleeve; 43. a seal ring B; 44. a high pressure gas container; 45. a circular groove; 46. a ring groove D; 47. installing a sleeve; 48. a spring C; 49. a bevel gear A; 50. a rotating shaft B; 51. a torsion wheel; 52. and (7) sealing the cover.

Detailed Description

The drawings are schematic illustrations of the implementation of the present invention to facilitate understanding of the principles of structural operation. The specific product structure and the proportional size are determined according to the use environment and the conventional technology.

As shown in fig. 1, 2 and 4, the door comprises a door frame 1, a door leaf 2, an embedded block 8, a hinge 10, a limiting rod a12, a limiting groove B13, a spring a14, a limiting rod B16, a spring B17, a thin steel wire 19, a swing rod 21, a cylinder 26, an elastic tube 28, a rotating shaft a33, a bevel gear B41, an internal thread bush 42, a high-pressure gas container 44, a bevel gear a49, a rotating shaft B50 and a torsion wheel 51, wherein as shown in fig. 3, 10 and 11, an embedded groove 3 is formed at the hinged position of each door leaf 2 and the door frame 1; the top and the bottom of each embedded groove 3 are respectively provided with a sliding groove A4, and a limiting rod A12 vertically slides in each sliding groove A4; as shown in fig. 3, 8 and 12, the limiting rod a12 is matched with the limiting groove a9 on the same side of the embedded block 8 embedded in the corresponding embedded groove 3, and the embedded block 8 is hinged with the doorframe 1 on the same side through a hinge 10; each limiting rod A12 is nested with a spring A14 for resetting the limiting rod A12; as shown in fig. 3, 11 and 13, a sliding groove B6 on the inner wall of each sliding groove a4 has a horizontal moving limiting rod B16, the limiting rod B16 is matched with a limiting groove B13 on the side wall of the corresponding limiting rod a12, and a spring B17 for resetting the limiting rod B16 is nested on the limiting rod B16.

As shown in fig. 2, 4 and 7, a cylinder 26 and a replaceable high-pressure gas container 44 are installed in each door leaf 2; one end of a swing rod 21 swinging around a swing shaft 23 is hinged with the tail end of a piston rod 24 arranged on a sliding plug 25 in an air cylinder 26, and the other end of the swing rod 21 is connected with the tail ends of four limiting rods B16 in the corresponding door leaf 2 through a plurality of thin steel wires 19; as shown in fig. 6 and 9, the swing shaft 23 is matched with the waist circular hole 22 on the swing rod 21; a hollow rotating shaft A33 which rotates along the circumferential direction and is in sliding fit with the two supports 40 arranged in the door leaf 2 in the axial direction is in threaded fit with an internal thread sleeve 42 arranged on the supports 40; a bevel gear A49 and a manual twisting wheel 51 are arranged on a rotating shaft B50 which is rotationally matched with the door leaf 2, and the bevel gear A49 is meshed with a bevel gear B41 which axially slides on the rotating shaft A33; as shown in fig. 9, 14 and 15, one end of the rotating shaft a33 with the saw teeth 36 is inserted into the circular groove 45 at one end of the high-pressure gas container 44 and is in sealing fit with the inner wall of the circular groove 45; as shown in fig. 4 and 7, one end of the rotating shaft a33 is communicated with the air inlet hole 27 on the wall of the air cylinder 26 through the elastic tube 28.

As shown in fig. 3 and 11, the spring a14 is located in a ring groove a5 on the inner wall of the corresponding sliding groove a 4; one end of the spring A14 is connected with the inner wall of the ring groove A5, and the other end is connected with a compression spring ring A15 arranged on the corresponding limiting rod A12; the spring B17 is positioned in a ring groove B7 on the inner wall of the corresponding sliding groove B6; one end of the spring B17 is connected with the inner wall of the ring groove B7, and the other end is connected with a compression spring ring B18 arranged on the corresponding limit rod B16.

As shown in fig. 8, the hinge 10 is attached to the insert block 8 and the door frame 1 by a tapping bolt 11; as shown in fig. 2, the thin steel wires 19 connected to the swing rods 21 are divided into four parts and are respectively connected to four limit rods B16 in the corresponding door leaf 2 under the guidance of the guide wheels 20. The guide wheel 20 ensures that the thin steel wire 19 pulls the limiting rod B16 to slide in the corresponding ring groove B7 in the horizontal direction, and the motion resistance of the limiting rod B16 is reduced. As shown in fig. 9, the rim of the torsion wheel 51 has anti-slip insections; the torsion wheel 51 is covered by a cover 52 mounted on the inside of the door leaf 2. The cover 52 prevents a child from twisting the torsion wheel 51.

As shown in fig. 6, 7 and 16, the rotating cap 29 is rotatably fitted on the end of the rotating shaft a33 not inserted into the circular groove 45, and the elastic tube 28 is communicated with the air outlet 31 in the middle of the rotating cap 29; a sealing ring A32 which is in sealing fit with the outer cylindrical surface of the rotating shaft A33 is arranged in a ring groove C30 on the inner wall of the rotating cap 29; as shown in fig. 6, 7 and 14, a sealing ring B43 which is in sealing fit with the outer cylindrical surface of the rotating shaft a33 is arranged in a ring groove D46 on the inner wall of the circular groove 45; as shown in fig. 6, 9 and 15, a shaft sleeve 37 is nested on the rotating shaft a33, and the shaft sleeve 37 is rotatably matched with two support seats 40 through two ball bearings 39; two guide keys 38 symmetrically arranged on the inner wall of the shaft sleeve 37 axially slide in the two guide grooves 34 on the rotating shaft A33 respectively; bevel gear B41 is fixedly mounted on bushing 37. The rotating cap 29 enables relative rotation between one end of the elastic tube 28 and the rotating shaft a33, so as to prevent the elastic tube 28 from being twisted due to the fixed connection with the rotating shaft a33 during the rotation of the rotating shaft a33, thereby preventing the reduction of the ventilation effect of the elastic tube 28.

As shown in fig. 4, the high-pressure gas container 44 is mounted in a mounting sleeve 47 in the door leaf 2; the mounting sleeve 47 is internally provided with a spring C48 which presses the high-pressure gas container 44 against the rotating shaft A33; one end of the spring C48 is connected with the inner wall of the mounting sleeve 47, and the other end is connected with one end of the high-pressure gas container 44; the circular groove 45 of the high pressure gas container 44 is tightly pressed against the end of the saw tooth 36 of the rotating shaft a 33.

As shown in fig. 2, 4 and 9, the escape method comprises the following steps: the high-pressure gas container 44 is opened by rotating the torsion wheel 51, high-pressure gas in the high-pressure gas container 44 enters the cylinder 26, the piston rod 24 of the cylinder 26 drives the swing rod 21 to swing around the swing shaft 23, the swing rod 21 pulls the four limiting rods B16 in the corresponding door leaf 2 to move through the thin steel wires 19 and removes the limitation on the four limiting rods A12, the four limiting rods A12 remove the limitation on the two embedded blocks 8 instantly under the action of the corresponding springs A14 respectively, and the door leaf 2 can be pushed open from inside to outside by disconnecting the connection between the door leaf 2 and the door frame 1, so that escape is realized.

In order to ensure the high pressure state of the gas in the high pressure gas container 44 in the present invention, the high pressure gas container 44 is periodically replaced.

The working process of the invention is as follows: in the initial state, the high pressure gas container 44 abuts against the end of the sawtooth 36 of the rotation shaft A33 under the urging of the precompression spring C48, and the piston rod 24 is retracted to the extreme position in the cylinder 26. Spring A14 and spring B17 are both in a compressed energy storage state. The thin steel wires 19 are in a taut state. The two door leaves 2 are in a closed state, the embedded blocks 8 are respectively embedded into the embedded grooves 3 on the corresponding door leaves 2, each limiting rod A12 is inserted into the limiting groove A9 on the corresponding embedded block 8, and each limiting rod B16 is inserted into the limiting groove B13 on the corresponding limiting rod A12.

When the two door leaves 2 are locked and can not be opened in the process of fire, people trapped in a room break any one of the sealing covers 52 on the door frame 1 by using a heavy object and rotate the torsion wheel 51, the torsion wheel 51 drives the bevel gear A49 to rotate through the rotating shaft B50, the bevel gear A49 drives the shaft sleeve 37 to rotate through the bevel gear B41, and the shaft sleeve 37 drives the rotating shaft A33 to synchronously rotate. The rotating shaft a33 is axially moved toward the high-pressure gas container 44 by the internal thread bush 42. The inner wall of the circular groove 45 of the high-pressure gas container 44 is drilled during the rotation of the sawtooth 36 end of the rotating shaft A33.

With the continuous rotation of the rotating shaft A33, the high-pressure gas container 44 is drilled through quickly, the high-pressure gas sealed in the high-pressure gas container 44 enters the cylinder 26 through the hollow rotating shaft A33 and the elastic tube 28 and pushes the piston rod 24 to move towards the outside of the cylinder 26 through the sliding plug 25, the piston rod 24 drives the swing rod 21 to swing around the swing shaft 23, and the swing rod 21 pulls the corresponding four limiting rods B16 towards the inside of the door leaf 2 through the thin steel wire 19. The four limiting rods B16 are respectively and rapidly separated from the limiting grooves B13 on the corresponding limiting rods A12, the limitation on the limiting rods A12 is removed, and the springs B17 nested on the limiting rods B16 are further compressed to store energy. The four limit rods a12 in the door leaf 2 are instantaneously retracted into the corresponding sliding grooves a4 and instantaneously separated from the corresponding limit grooves a9 on the embedded blocks 8 under the action of the corresponding springs a14, and the four limit rods a12 simultaneously release the limitation on the two embedded blocks 8. At this moment, the door leaf 2 is disconnected with the door frame 1, and the personnel stranded in the room promote the door leaf 2 from inside to outside, and the door leaf 2 breaks away from and outwards opens around another door leaf 2 and the pin joint of door frame 1 with two embedded blocks 8 to realize fleing fast.

In conclusion, the beneficial effects of the invention are as follows: according to the invention, the door leaf 2 on the same side can be disconnected from the door frame 1 by manually rotating the torsion wheel 51 on the inner side of the door frame 1, so that indoor personnel can easily push the door leaf 2 open from inside to outside and realize quick escape, and the escape efficiency of trapped personnel in emergency such as fire is improved.

Claims

1. A hinge structure for quick escape is characterized in that: the door comprises a door frame, door leaves, embedded blocks, hinges, a limiting rod A, a limiting groove B, a spring A, a limiting rod B, a spring B, a thin steel wire, a swing rod, a cylinder, an elastic tube, a rotating shaft A, a bevel gear B, an internal thread sleeve, a high-pressure gas container, a bevel gear A, a rotating shaft B and a torsion wheel, wherein the hinged part of each door leaf and the door frame is provided with an embedded groove; the top and the bottom of each embedded groove are respectively provided with a sliding groove A, and a limiting rod A vertically slides in each sliding groove A; the limiting rod A is matched with a limiting groove A on the same side of the embedded block embedded into the corresponding embedded groove, and the embedded block is hinged with the same side of the door frame through a hinge; each limiting rod A is nested with a spring A for resetting the limiting rod A; a limiting rod B horizontally moves in the sliding groove B on the inner wall of each sliding groove A, is matched with a limiting groove B on the side wall of the corresponding limiting rod A, and is nested with a spring B for resetting the limiting rod B;

2. The hinge structure for quick escape according to claim 1, wherein: the spring A is positioned in the annular groove A on the inner wall of the corresponding sliding groove A; one end of the spring A is connected with the inner wall of the ring groove A, and the other end of the spring A is connected with a compression spring ring A arranged on the corresponding limiting rod A; the spring B is positioned in the annular groove B on the inner wall of the corresponding sliding groove B; one end of the spring B is connected with the inner wall of the ring groove B, and the other end of the spring B is connected with a compression spring ring B arranged on the corresponding limiting rod B.

3. The hinge structure for quick escape according to claim 1, wherein: the hinge is arranged on the embedded block and the door frame through self-tapping bolts; the thin steel wires I connected with the swing rod are divided into four and are respectively connected with four limiting rods B in the corresponding door leaf under the guidance of a plurality of guide wheels; the rim of the torsion wheel is provided with anti-skid insections; the torsion wheel is covered by a cover mounted on the inside of the door leaf.

4. The hinge structure for quick escape according to claim 1, wherein: a rotating cap is rotatably matched on one end of the rotating shaft A, which is not inserted into the circular groove, and the elastic pipe is communicated with an air outlet in the middle of the rotating cap; a sealing ring A which is in sealing fit with the outer cylindrical surface of the rotating shaft A is arranged in the annular groove C on the inner wall of the rotating cap; a sealing ring B which is in sealing fit with the outer cylindrical surface of the rotating shaft A is arranged in a ring groove D on the inner wall of the circular groove; a shaft sleeve is nested on the rotating shaft A and is in rotating fit with the two supports through two rolling ball bearings; two guide keys symmetrically arranged on the inner wall of the shaft sleeve axially slide in two guide grooves on the rotating shaft A respectively; the bevel gear B is fixedly arranged on the shaft sleeve.

5. The hinge structure for quick escape according to claim 1, wherein: the high-pressure gas container is arranged in the mounting sleeve in the door leaf; the mounting sleeve is internally provided with a spring C which presses the high-pressure gas container against the rotating shaft A; one end of the spring C is connected with the inner wall of the mounting sleeve, and the other end of the spring C is connected with one end of the high-pressure gas container; the circular groove of the high-pressure gas container is tightly pressed against the sawtooth end of the rotating shaft A.

6. An escape method based on the hinge structure for quick escape of claim 1, characterized in that: the escape method comprises the following steps: open the high-pressure gas container through the rotating pulley, high-pressure gas in the high-pressure gas container gets into the cylinder, the piston rod of cylinder drives the pendulum rod and swings around the pendulum shaft, the pendulum rod passes through four gag lever post B motion in the corresponding door leaf of thin steel wire pulling and removes the restriction to four gag lever post A, four gag lever post A remove the restriction to two embedding pieces in the twinkling of an eye under corresponding spring A's effect respectively, through being connected of disconnection door leaf and door frame, make the door leaf push open from inside to outside, thereby realize fleing.