CN210768476U - Compound fire window of multilayer - Google Patents

Abstract

The utility model discloses a multi-layer composite fire-proof window, which comprises a window frame and a window sash rotationally connected with the window frame, the top edge of the window frame is rotatably connected with the top edge of the window sash through a metal hinge, the window sash comprises a frame body, first fireproof glass embedded on the first surface of the frame body, second fireproof glass embedded on the second surface of the frame body, and third fireproof glass embedded in the middle of the frame body and positioned between the first fireproof glass and the second fireproof glass, a first hollow space is clamped between the first fireproof glass and the third fireproof glass, a second hollow space is clamped between the second fireproof glass and the third fireproof glass, the inner side wall of the top edge of the window frame is fixedly provided with a first fireproof sealing rubber gasket, and the first fireproof sealing rubber gasket is clamped between the top edge of the window frame and the top edge of the frame body to seal a gap between the top edge of the window frame and the top edge of the frame body when the window sash is closed.

Description

Compound fire window of multilayer

Technical Field

The utility model relates to a compound fire prevention window of multilayer.

Background

When the existing fireproof window is closed, a certain gap often exists between a window sash and a window frame, and the existing window bolt is difficult to completely lock the window sash, so that smoke dust is supplied to the gap to enter the indoor space. And the metal hinge that connects casement and window frame is damaged easily at long-time use in the fire window, leads to the casement to have the risk of droing.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model lies in, to prior art's above-mentioned defect, a compound fire prevention window of multilayer is provided.

The utility model provides a technical scheme that its technical problem adopted is: a multi-layer composite fireproof window is constructed, the fireproof window comprises a window frame and a window sash which is rotatably connected with the window frame, the top edge of the window frame is rotatably connected with the top edge of the window sash through a metal hinge, the window sash comprises a frame body, first fireproof glass embedded on the first surface of the frame body, second fireproof glass embedded on the second surface of the frame body, and third fireproof glass embedded in the middle of the frame body and positioned between the first fireproof glass and the second fireproof glass, a first hollow interval is clamped between the first fireproof glass and the third fireproof glass, a second hollow interval is clamped between the second fireproof glass and the third fireproof glass, a first fireproof sealing rubber gasket is fixedly arranged on the inner side wall of the top edge of the window frame, and the first fireproof sealing rubber gasket is clamped between the top edge of the window frame and the top edge of the frame body when the window sash is closed to seal a gap between the top edge of the window frame and the top edge of the frame body, the outer side surface of the first side edge of the frame body is provided with a first cover plate which extends outwards from the first side edge of the frame body, the first cover plate covers a gap between the first side edge of the frame body and the first side edge of the window frame when the window sash is closed, the outer side surface of the second side edge of the frame body is provided with a second cover plate which extends outwards from the second side edge of the frame body, the second cover plate covers a gap between the second side edge of the frame body and the second side edge of the window frame when the window sash is closed, the outer side surface of the bottom edge of the frame body is provided with a third cover plate which extends outwards from the bottom edge of the frame body, the third cover plate covers a gap between the bottom edge of the frame body and the bottom edge of the window frame when the window sash is closed, the inner side surface of the first cover plate is fixedly provided with a second fire-resistant sealing rubber gasket, the inner side surface of the second cover plate is fixedly provided with a third fire-resistant, a second threaded column vertically and fixedly connected with the second cover plate is fixedly arranged in the middle of the inner side surface of the first cover plate, a third threaded column vertically and fixedly connected with the third cover plate is fixedly arranged in the middle of the inner side surface of the third cover plate, a first strip-shaped through hole for the first threaded column to pass through is arranged on the first side edge of the frame body, a second strip-shaped through hole for the second threaded column to pass through is arranged on the second side edge of the frame body, a third strip-shaped through hole for the third threaded column to pass through is arranged on the bottom edge of the frame body, the length of the first threaded column is larger than the depth of the first strip-shaped through hole, the length of the second threaded column is larger than the depth of the second strip-shaped through hole, the length of the third threaded column is larger than the depth of the third strip-shaped through hole, a first threaded knob capable of being screwed with the first threaded column is arranged on the first threaded column, and a second threaded knob capable, a third threaded knob which can be in threaded connection with the third threaded column is arranged on the third threaded column, the diameter of the first threaded knob is larger than the width of the first elongated through hole, the diameter of the second threaded knob is larger than the width of the second elongated through hole, and the diameter of the third threaded knob is larger than the width of the third elongated through hole;

the outer surface top end of the first side edge of the frame body is fixedly provided with a first fixing ring, the first end of the outer surface of the top edge of the window frame is fixedly provided with a second fixing ring, a first metal chain for connecting the first fixing ring and the second fixing ring is arranged between the first fixing ring and the second fixing ring, the outer surface top end of the second side edge of the frame body is fixedly provided with a third fixing ring, the second end of the outer surface of the top edge of the window frame is fixedly provided with a fourth fixing ring, and a second metal chain for connecting the third fixing ring and the fourth fixing ring is arranged between the third fixing ring and the fourth fixing ring.

In the multi-layer composite fireproof window, a first ring groove, a second ring groove and a third ring groove are arranged on the inner side wall of the frame body, and are used for fixing and embedding the first fireproof glass, the second fireproof glass and the third fireproof glass.

In the multi-layer composite fire window, the first threaded post second end and the first cover plate are fixedly connected, the first end of the first threaded post is provided with a first external thread, the second threaded post second end and the second cover plate are fixedly connected, the first end of the second threaded post is provided with a second external thread, the second end of the third threaded post and the third cover plate are fixedly connected, and the first end of the third threaded post is provided with a third external thread.

In the multi-layer composite fire window, the middle part of the second fire-resistant sealing rubber pad is provided with a first through hole for the first threaded column to pass through, the middle part of the third fire-resistant sealing rubber pad is provided with a second through hole for the second threaded column to pass through, and the middle part of the fourth fire-resistant sealing rubber pad is provided with a third through hole for the third threaded column to pass through.

In the multilayer composite fireproof window of the utility model, the inner side wall of the first side edge of the window frame is provided with a first vertical chute and a first slide block which can slide in the first vertical chute, a first supporting strip for supporting the window sash when the window sash is opened is arranged between the first sliding block and the first side edge of the frame body, the first end of the first supporting bar is rotatably connected with the first sliding block, the second end of the first supporting bar is rotatably connected with the first side of the frame body, a second vertical sliding groove and a second sliding block which can slide in the second vertical sliding groove are arranged on the inner side wall of the second side edge of the window frame, a second supporting strip for supporting the window sash when the window sash is opened is arranged between the second sliding block and the second side edge of the frame body, the first end of the second supporting strip is rotatably connected with the second sliding block, and the second end of the second supporting strip is rotatably connected with the second side edge of the frame body.

In the multi-layer composite fire window of the present invention, the first end of the first supporting strip is provided with a first shaft hole, the first slider is provided with a first rotating shaft which can be inserted into the first shaft hole and can be rotatably connected with the first shaft hole, the second end of the first supporting strip is provided with a second shaft hole, and the first side of the frame body is provided with a second rotating shaft which can be inserted into the second shaft hole and can be rotatably connected with the second shaft hole; the first end of the second support bar is provided with a third shaft hole, the second slider is provided with a third rotating shaft which can be inserted into the third shaft hole and can be rotatably connected with the third shaft hole, the second end of the second support bar is provided with a fourth shaft hole, and the second side edge of the frame body is provided with a fourth rotating shaft which can be inserted into the fourth shaft hole and can be rotatably connected with the fourth shaft hole.

Implement the utility model discloses a compound fire window of multilayer has following beneficial effect: when the multi-layer composite fire-proof window of the utility model is used, the window sash is rotated around the metal hinge when a fire disaster happens until the window sash is clamped into the window frame, the first cover plate, the second cover plate and the third cover plate are respectively arranged on the first side edge of the window frame, second side and base position department, at this moment, first fire-resistant sealed cushion clamp is located in the gap of window frame topside and framework topside, form the sealed of window frame topside and framework topside, the sealed pad lid of sealed glue of second fire-resistant locates outside the gap between window frame first side and the framework first side, form the sealed to window frame first side and framework first side, the sealed pad lid of sealed glue of third fire-resistant locates outside the gap between window frame second side and the framework second side, form the sealed to window frame second side and framework second side, the sealed pad lid of sealed glue of fourth fire-resistant locates outside the gap between window frame base and the framework base, form the sealed at the bottom of window frame base and the framework. Furthermore, when the first cover plate, the second cover plate and the third cover plate are not tightly covered, the first threaded knob can be sleeved on the first end of the first threaded column, the second threaded knob can be sleeved on the first end of the second threaded column, the third threaded knob can be sleeved on the first end of the third threaded column, the first threaded knob, the second threaded knob and the third threaded knob are rotated to drive the first cover plate, the second cover plate and the third cover plate are drawn close to the window frame, and therefore the first cover plate, the second cover plate and the third cover plate clamp the second fire-resistant sealing rubber gasket, the third fire-resistant sealing rubber gasket and the fourth fire-resistant sealing rubber gasket, and sealing is formed better. Through setting up three-layer fire prevention glass, and set up the cavity interval between two adjacent fire prevention glass, play thermal-insulated, fire prevention effect, when monolithic fire prevention glass damaged again, other fire prevention glass can continue to play the fire prevention effect. Further, the window sash and the window frame are further connected through the first metal chain and the second metal chain, and when the metal hinge is damaged, the first metal chain and the second metal chain can play a role in preventing the window sash from falling from high altitude.

Drawings

The invention will be further explained with reference to the drawings and examples, wherein:

fig. 1 is a schematic structural view of the multi-layer composite fire-proof window of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

As shown in fig. 1, in the first embodiment of the multi-layer composite fire-proof window of the present invention, the fire-proof window 1 includes a window frame 2 and a window sash 3 rotatably connected to the window frame 2, the top edge of the window frame 2 and the top edge of the window sash 3 are rotatably connected by a metal hinge 4, the window sash 3 includes a frame 7, a first fire-proof glass 8 embedded in the first surface of the frame 7, a second fire-proof glass embedded in the second surface of the frame 7, and a third fire-proof glass embedded in the middle of the frame 7 and located between the first fire-proof glass 8 and the second fire-proof glass, a first hollow space is sandwiched between the first fire-proof glass 8 and the third fire-proof glass, a second hollow space is sandwiched between the second fire-proof glass and the third fire-proof glass, a first fire-resistant sealing rubber pad 9 is fixedly disposed on the inner side wall of the top edge of the window frame 2, and the first fire-resistant sealing rubber pad 9 is sandwiched between the top edge of the window frame 2 and the top edge of the frame 7 when A gap between the top edge of the frame body 7 and the top edge of the frame body 7, a first cover plate 10 extending outward from the first side edge of the frame body 7 is arranged on the outer side surface of the first side edge of the frame body 7, the first cover plate 10 covers the gap between the first side edge of the frame body 7 and the first side edge of the window frame 2 when the window sash 3 is closed, a second cover plate 11 extending outward from the second side edge of the frame body 7 is arranged on the outer side surface of the second side edge of the frame body 7, the second cover plate 11 covers the gap between the second side edge of the frame body 7 and the second side edge of the window frame 2 when the window sash 3 is closed, a third cover plate 12 extending outward from the bottom edge of the frame body 7 is arranged on the outer side surface of the bottom edge of the frame body 7, the third cover plate 12 covers the gap between the bottom edge of the frame body 7 and the bottom edge of the window frame 2 when the window sash 3 is closed, a fourth refractory sealing rubber pad 15 is fixedly arranged on the inner side surface of the third cover plate 12, a first threaded column 16 vertically and fixedly connected with the first cover plate 10 is fixedly arranged in the middle of the inner side surface of the first cover plate 10, a second threaded column 17 vertically and fixedly connected with the second cover plate 11 is fixedly arranged in the middle of the inner side surface of the first cover plate 10, a third threaded column 5 vertically and fixedly connected with the third cover plate 12 is fixedly arranged in the middle of the inner side surface of the third cover plate 12, a first elongated through hole 18 for the first threaded column 16 to pass through is arranged on the first side edge of the frame body 7, a second elongated through hole 19 for the second threaded column 17 to pass through is arranged on the second side edge of the frame body 7, a third elongated through hole 6 for the third threaded column 5 to pass through is arranged on the bottom edge of the frame body 7, the length of the first threaded column 16 is greater than the depth of the first elongated through hole 18, the length of the second threaded column 17 is greater than the depth, the length of the third threaded column 5 is greater than the depth of the third elongated through hole 6, the first threaded column 16 is provided with a first threaded knob 20 which can be screwed with the first threaded column 16, the second threaded column 17 is provided with a second threaded knob 21 which can be screwed with the second threaded column 17, the third threaded column 5 is provided with a third threaded knob 32 which can be screwed with the third threaded column 5, the diameter of the first threaded knob 20 is greater than the width of the first elongated through hole 18, the diameter of the second threaded knob 21 is greater than the width of the second elongated through hole 19, and the diameter of the third threaded knob 32 is greater than the width of the third elongated through hole 6;

the first solid fixed ring 33 of having set firmly in the first side surface top of this framework 7, the solid fixed ring 34 of second has set firmly in the first end of the top side surface of this window frame 2, be equipped with the first metal chain 35 of connecting the solid fixed ring 33 of this first and the solid fixed ring 34 of this second between the solid fixed ring 33 of this first and the solid fixed ring 34 of this second, the solid fixed ring 36 of third has set firmly in the second side surface top of this framework 7, the solid fixed ring 37 of fourth has set firmly in the second end of the top side surface of this window frame 2, be equipped with the second metal chain 38 of connecting the solid fixed ring 36 of this third and the solid fixed ring 37 of this fourth between the solid fixed ring 36.

When the multilayer composite fire-proof window 1 of the utility model is used, when a fire disaster happens, the window sash 3 is rotated around the metal hinge 4 until the window sash 3 is clamped into the window frame 2, the first cover plate 10, the second cover plate 11 and the third cover plate 12 are respectively covered at the positions of the first side edge, the second side edge and the bottom edge of the window frame 2, at the moment, the first fire-resistant sealing rubber gasket 9 is clamped in the gap between the top edge of the window frame 2 and the top edge of the frame body 7 to form the sealing between the top edge of the window frame 2 and the top edge of the frame body 7, the second fire-resistant sealing rubber gasket 13 is covered outside the gap between the first side edge of the window frame 2 and the first side edge of the frame body 7 to form the sealing between the first side edge of the window frame 2 and the first side edge of the frame body 7, the third fire-resistant sealing rubber gasket 14 is covered outside the gap between the second side edge of the window frame 2 and the second side edge of the frame body 7 to form the sealing, forming a seal against the bottom edge of the sash 2 and the bottom of the frame 7. Further, when the first cover plate 10, the second cover plate 11 and the third cover plate 12 are covered and arranged not tightly enough, the first threaded knob 20 can be sleeved on the first end of the first threaded column 16, the second threaded knob 21 can be sleeved on the first end of the second threaded column 17, the third threaded knob 32 can be sleeved on the first end of the third threaded column 5, and the first threaded knob 20, the second threaded knob 21 and the third threaded knob are rotated to drive the first cover plate 10, the second cover plate 11 and the third cover plate 12 to approach to the window frame 2, so that the first cover plate 10, the second cover plate 11 and the third cover plate 12 clamp the second fire-resistant sealing rubber gasket 13, the third fire-resistant sealing rubber gasket 14 and the fourth fire-resistant sealing rubber gasket 15, and sealing is formed better. Through setting up three-layer fire prevention glass, and set up the cavity interval between two adjacent fire prevention glass, play thermal-insulated, fire prevention effect, when monolithic fire prevention glass damaged again, other fire prevention glass can continue to play the fire prevention effect. Further, by further connecting the window sash 3 and the window frame 2 using the first metal chain 35 and the second metal chain 38, the first metal chain 35 and the second metal chain 38 may function to prevent the window sash 3 from falling aloft when the metal hinge 4 is damaged.

Specifically, a first annular groove, a second annular groove and a third annular groove are formed in the inner side wall of the frame body 7, and the first fireproof glass 8, the second fireproof glass and the third fireproof glass are fixedly embedded in the first annular groove, the second annular groove and the third annular groove. It can be understood that the first, second, and third annular grooves are respectively pre-disposed on the first, second, top, and bottom sides of the frame body 7, and after the first, second, and third fire glasses 8, 8 are fixedly embedded in the first, second, and third annular grooves, the first, second, top, and bottom sides of the frame body 7 are fixedly welded.

In order to facilitate the first bolt knob, the second bolt knob and the third bolt knob to be screwed down from the first threaded column 16, the second threaded column 17 and the third threaded column 5, the second end of the first threaded column 16 is fixedly connected with the first cover plate 10, the first end of the first threaded column 16 is provided with a first external thread, the second end of the second threaded column 17 is fixedly connected with the second cover plate 11, the first end of the second threaded column 17 is provided with a second external thread, the second end of the third threaded column 5 is fixedly connected with the third cover plate 12, and the first end of the third threaded column 5 is provided with a third external thread.

Furthermore, a first through hole for the first threaded post 16 to pass through is formed in the middle of the second refractory sealing rubber pad 13, a second through hole for the second threaded post 17 to pass through is formed in the middle of the third refractory sealing rubber pad 14, and a third through hole for the third threaded post 5 to pass through is formed in the middle of the fourth refractory sealing rubber pad 15.

In order to support the window sash 3, a first vertical sliding slot 22 and a first sliding block 24 capable of sliding in the first vertical sliding slot 22 are provided on the inner side wall of the first side of the window frame 2, a first supporting bar 28 for supporting the window sash 3 when the window sash 3 is opened is arranged between the first slider 24 and the first side edge of the frame 7, a first end of the first supporting bar 28 is rotatably connected to the first sliding block 24, a second end of the first supporting bar 28 is rotatably connected to a first side of the frame 7, a second vertical sliding groove 23 and a second sliding block 25 which can slide in the second vertical sliding groove 23 are arranged on the inner side wall of the second side edge of the window frame 2, a second supporting bar 31 for supporting the window sash 3 when the window sash 3 is opened is arranged between the second sliding block 25 and the second side edge of the frame body 7, the first end of the second supporting bar 31 is rotatably connected to the second sliding block 25, and the second end of the second supporting bar 31 is rotatably connected to the second side of the frame 7.

Further, a first shaft hole is formed at a first end of the first supporting bar 28, a first rotating shaft 26 capable of being inserted into the first shaft hole and rotatably connected with the first shaft hole is arranged on the first slider 24, a second shaft hole is formed at a second end of the first supporting bar 28, and a second rotating shaft 27 capable of being inserted into the second shaft hole and rotatably connected with the second shaft hole is arranged on a first side edge of the frame 7; the first end of the second supporting bar 31 is provided with a third shaft hole, the second slider 25 is provided with a third rotating shaft 29 which can be inserted into the third shaft hole and can be rotatably connected with the third shaft hole, the second end of the second supporting bar 31 is provided with a fourth shaft hole, and the second side edge of the frame body 7 is provided with a fourth rotating shaft 30 which can be inserted into the fourth shaft hole and can be rotatably connected with the fourth shaft hole.

The above only is the embodiment of the present invention, not limiting the patent scope of the present invention, all the equivalent structures or equivalent processes that are used in the specification and the attached drawings or directly or indirectly applied to other related technical fields are included in the patent protection scope of the present invention.

Claims (6)

1. The utility model provides a compound fire window of multilayer, its characterized in that, fire window include the window frame and with window frame rotatable coupling's casement, the window frame topside with the casement topside passes through metal hinge rotatable coupling, the casement includes the framework, inlays to be located the first fire prevention glass of the first face of framework, inlay to be located the second fire prevention glass of framework second face and inlay to be located the framework middle part is located third fire prevention glass between first fire prevention glass and the second fire prevention glass, first fire prevention glass with press from both sides between the third fire prevention glass and be equipped with first cavity interval, second fire prevention glass with press from both sides between the third fire prevention glass and be equipped with second cavity interval, first fire prevention sealing cushion is in when the casement is closed press from both sides and is located the window frame topside with sealed between the framework topside window frame topside with gap between the framework topside The outer side surface of the first side edge of the frame body is provided with a first cover plate which is formed by extending the first side edge of the frame body outwards, the first cover plate covers a gap between the first side edge of the frame body and the first side edge of the window frame when the window sash is closed, the outer side surface of the second side edge of the frame body is provided with a second cover plate which is formed by extending the second side edge of the frame body outwards, the second cover plate covers a gap between the second side edge of the frame body and the second side edge of the window frame when the window sash is closed, the outer side surface of the bottom edge of the frame body is provided with a third cover plate which is formed by extending the bottom edge of the frame body outwards, the third cover plate covers a gap between the bottom edge of the frame body and the bottom edge of the window frame when the window sash is closed, the inner side surface of the first cover plate is fixedly provided with, the middle part of the inner side surface of the first cover plate is fixedly provided with a first threaded column which is vertically and fixedly connected with the first cover plate, the middle part of the inner side surface of the first cover plate is fixedly provided with a second threaded column which is vertically and fixedly connected with the second cover plate, the middle part of the inner side surface of the third cover plate is fixedly provided with a third threaded column which is vertically and fixedly connected with the third cover plate, the first side edge of the frame body is provided with a first strip-shaped through hole for the first threaded column to pass through, the second side edge of the frame body is provided with a second strip-shaped through hole for the second threaded column to pass through, the bottom edge of the frame body is provided with a third strip-shaped through hole for the third threaded column to pass through, the length of the first threaded column is larger than the depth of the first strip-shaped through hole, the length of the second threaded column is larger than the depth of the second strip-shaped through hole, the length of the third threaded column is larger than the, a second threaded knob capable of being in threaded connection with the second threaded column is arranged on the second threaded column, a third threaded knob capable of being in threaded connection with the third threaded column is arranged on the third threaded column, the diameter of the first threaded knob is larger than the width of the first elongated through hole, the diameter of the second threaded knob is larger than the width of the second elongated through hole, and the diameter of the third threaded knob is larger than the width of the third elongated through hole;

the utility model discloses a window frame, including frame body, first side surface top of frame body, first solid fixed ring, the first metal chain of first solid fixed ring with the solid fixed ring of second, frame body second side surface top has set firmly the solid fixed ring of third, frame body top side surface second end has set firmly the solid fixed ring of fourth, the solid fixed ring of third with be equipped with the connection between the solid fixed ring of fourth the solid fixed ring of third with the solid fixed ring's of fourth second metal chain.

2. The multi-layer composite fire window of claim 1, wherein the inner side wall of the frame body is provided with a first annular groove, a second annular groove and a third annular groove for fixedly embedding the first fire-proof glass, the second fire-proof glass and the third fire-proof glass.

3. The multi-layer composite fire window of claim 1, wherein the first threaded post has a second end fixedly connected to the first cover plate, the first end of the first threaded post has a first external thread, the second end of the second threaded post has a second external thread, the second end of the third threaded post has a third external thread, and the third end of the third threaded post has a third external thread.

4. The multi-layered composite fire window of claim 1, wherein a first through hole for passing the first threaded post is formed in the middle of the second fire-resistant sealing rubber pad, a second through hole for passing the second threaded post is formed in the middle of the third fire-resistant sealing rubber pad, and a third through hole for passing the third threaded post is formed in the middle of the fourth fire-resistant sealing rubber pad.

5. The multi-layer composite fire window of claim 1, wherein a first vertical sliding groove and a first sliding block capable of sliding in the first vertical sliding groove are disposed on an inner side wall of a first side of the window frame, a first supporting bar for supporting the window sash when the window sash is opened is disposed between the first sliding block and the first side of the frame body, a first end of the first supporting bar is rotatably connected to the first sliding block, a second end of the first supporting bar is rotatably connected to the first side of the frame body, a second vertical sliding groove and a second sliding block capable of sliding in the second vertical sliding groove are disposed on an inner side wall of a second side of the window frame, a second supporting bar for supporting the window sash when the window sash is opened is disposed between the second sliding block and the second side of the frame body, a first end of the second supporting bar is rotatably connected to the second sliding block, and the second end of the second support bar is rotatably connected with the second side edge of the frame body.

6. The multi-layer composite fire window of claim 5, wherein a first shaft hole is formed at a first end of the first supporting bar, a first rotating shaft which can be inserted into the first shaft hole and can be rotatably connected with the first shaft hole is formed on the first sliding block, a second shaft hole is formed at a second end of the first supporting bar, and a second rotating shaft which can be inserted into the second shaft hole and can be rotatably connected with the second shaft hole is formed on a first side edge of the frame body; the first end of second support bar is equipped with the third shaft hole, be equipped with on the second slider and can insert extremely in the third shaft hole with third shaft hole rotatable coupling's third pivot, second support bar second end is equipped with the fourth shaft hole, be equipped with on the framework second side can insert extremely in the fourth shaft hole with fourth shaft hole rotatable coupling's fourth pivot.

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