CN215167293U

CN215167293U - Trample open type smoke exhaust skylight

Info

Publication number: CN215167293U
Application number: CN202121615964.9U
Authority: CN
Inventors: 张永祥
Original assignee: Jiangsu Epner Energy Saving Technology Co ltd
Current assignee: Jiangsu Epner Energy Saving Technology Co ltd
Priority date: 2021-07-15
Filing date: 2021-07-15
Publication date: 2021-12-14
Anticipated expiration: 2031-07-15

Abstract

The utility model relates to a tread-open type smoke exhaust skylight, which comprises glass, a fixed plate and an opening mechanism, the fixed plate is provided with an opening, the glass is arranged at the opening, the opening mechanism is arranged on the fixed plate and comprises a treading assembly, a limiting assembly and a pulling assembly, the treading opening type smoke exhaust skylight realizes the opening and closing of the glass through the opening mechanism, thereby realizing smoke exhaust, the opening mechanism replaces hand operation with a treading mode, avoids stooping down, saves manpower, the limiting component carries out multiple limiting on the clamping block through the spring and the elastic rope, thereby realizing better fixing and limiting effects, synchronously moving the two clamping blocks through the synchronous unit, thereby avoid the footboard card to die for the device operation is more stable, and this pulling subassembly adopts two structures of opening the door, has improved efficiency.

Description

Trample open type smoke exhaust skylight

Technical Field

The utility model relates to a trample open-type skylight of discharging fume.

Background

The skylight is a window which is arranged on the roof for ventilation and light transmission, and the smoke exhaust skylight is the same as the smoke exhaust window.

The existing smoke exhaust skylight is generally driven by a motor when being opened, once power is cut off, the smoke exhaust skylight cannot be opened, mechanical opening devices in the market are generally opened manually, operators need to bend down to operate, and large manpower is consumed, so that the opening devices in the market are opened when being trampled, pedals of the existing trampling type opening devices are generally locked by locking mechanisms, and once the locking mechanisms are locked, the pedals cannot be trampled, and the use of the device is influenced.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is: in order to overcome the defects of the prior art, a tread-open type smoke exhaust skylight is provided.

The utility model provides a technical scheme that its technical problem adopted is: a trample-open type smoke exhaust skylight comprises glass, a fixed plate and an opening mechanism, wherein an opening is formed in the fixed plate, the glass is arranged at the opening, grooves are formed in two sides of the opening, the number of the glass is two, the two glass parts are arranged in the two grooves, one end of the glass is located in the groove, the other end of the glass extends out of the groove, the glass is connected with the groove in a sliding mode, one ends of the two glass parts, which are located outside the grooves, are attached, and the opening mechanism is arranged on the fixed plate;

the opening mechanism comprises a treading assembly, a limiting assembly and a pulling assembly, the treading assembly comprises a limiting plate, a pedal and a first spring, the limiting plate is arranged below the limiting plate, a chute is arranged on the limiting plate, one end of the pedal is positioned in the chute, the pedal is in sliding connection with the chute, the first spring is arranged in the chute, one end of the first spring is connected with the chute, the other end of the first spring is connected with the pedal, the limiting assembly comprises two limiting units and a synchronizing unit, the two limiting units are respectively arranged on two sides of the pedal, each limiting unit comprises a shell, a clamping block, a second spring and a limiting rod, the shell is arranged in the pedal, the top of the shell is open, the clamping block is arranged at the opening and abutted against the shell, and two clamping grooves are formed in the chute, the two clamping grooves are respectively arranged at two ends of the sliding groove, the clamping block is positioned in one clamping groove, the second spring is arranged in the shell, one end of the second spring can be connected with the clamping block, the other end of the second spring is connected with the shell, one end of the limiting rod is positioned in the shell and connected with the clamping block, the other end of the limiting rod penetrates through the shell, the limiting rod is in sliding connection with the shell, the synchronizing unit comprises a fixing frame, a rotating shaft, a first wire coil, a fixing block, an elastic rope, a gear and racks, the fixing frame is arranged between the two shells of the two limiting units, the rotating shaft is arranged in the fixing frame, the gear is sleeved on the rotating shaft, the gear is in key connection with the rotating shaft, one end of the limiting rod, which is positioned outside the shell, extends into the fixing frame, the racks are two, the two racks are respectively arranged on the two limiting rods, and the two racks are respectively positioned at two sides of the gear, the gear all with two rack toothing, first drum cover is established in the pivot, first drum and pivot key-type connection, the fixed block sets up in fixed frame, the one end and the first drum of elasticity rope are connected, the other end and the fixed block of elasticity rope are connected.

In order to realize the opening of the glass, the pulling assembly comprises a rotating unit and a pulling unit, the rotating unit comprises a fixed shaft, a second wire coil and a first pull rope, the fixed shaft is arranged on the fixed plate, the second wire coil is sleeved on the fixed shaft and connected with the fixed shaft in a key mode, one end of the first pull rope is connected with the second wire coil, the other end of the first pull rope is connected with the pedal, the number of the pulling units is two, the two pulling units are respectively arranged corresponding to the two glasses, the pulling unit comprises a third wire coil, a second pull rope and a third spring, the third wire coil is sleeved on the fixed shaft and connected with the fixed shaft in a key mode, one end of the second pull rope is connected with the third wire coil, the other end of the second pull rope extends into the groove to be connected with the glass, the third spring is arranged in the groove, one end of the third spring is connected with the groove, the other end of the third spring is connected with the glass.

In order to better limit the second pull rope, a positioning wheel is arranged on the second pull rope, the positioning wheel is arranged on a fixing plate and is flush with the glass, and the second pull rope bypasses the positioning wheel.

The beneficial effects of the utility model are that, should step on open-type skylight of discharging fume, realize opening and closing of glass through opening mechanism, thereby realize discharging fume, compare with current opening mechanism, this mechanism replaces the hand operation with the mode of trampling, bowing has been avoided, the manpower has been saved, compare with current spacing subassembly, this subassembly carries out the multiplexingly to the fixture block through spring and elasticity rope spacing, thereby realize better fixed spacing effect, carry out synchronous motion to two fixture blocks through the synchronizing unit simultaneously, thereby avoid the footboard card to die, make the device operation more stable, compare with current pulling subassembly, this pulling subassembly adopts double door structure, the opening is opened closing speed has been improved, the efficiency is improved.

Drawings

The present invention will be further explained with reference to the drawings and examples.

Fig. 1 is a schematic structural view of a tread-open type smoke exhaust skylight of the present invention;

fig. 2 is a schematic structural view of a limit component of the treading open type smoke exhaust skylight of the utility model;

fig. 3 is a schematic structural view of a synchronizing unit of the treading-open type smoke evacuation skylight of the present invention;

in the figure: 1. the novel bicycle comprises glass, 2 parts of a fixing plate, 3 parts of a limiting plate, 4 parts of a pedal, 5 parts of a first spring, 6 parts of a shell, 7 parts of a clamping block, 8 parts of a second spring, 9 parts of a limiting rod, 10 parts of a fixing frame, 11 parts of a rotating shaft, 12 parts of a first wire coil, 13 parts of a fixing block, 14 parts of an elastic rope, 15 parts of a gear, 16 parts of a rack, 17 parts of a fixing shaft, 18 parts of a second wire coil, 19 parts of a first pull rope, 20 parts of a third wire coil, 21 parts of a second pull rope, 22 parts of a third spring and 23 parts of a positioning wheel.

Detailed Description

The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic drawings and illustrate the basic structure of the present invention only in a schematic manner, and thus show only the components related to the present invention.

As shown in fig. 1, a treading open type smoke exhaust skylight comprises glass 1, a fixed plate 2 and an opening mechanism, wherein an opening is formed in the fixed plate 2, the glass 1 is arranged at the opening, grooves are formed in two sides of the opening, the glass 1 is divided into two parts, one end of the glass 1 is located in each groove, the other end of the glass 1 extends out of each groove, the glass 1 is connected with the grooves in a sliding mode, one ends of the two glass 1, which are located outside the grooves, are attached to each other, and the opening mechanism is arranged on the fixed plate 2;

when the device is used, the fixing plate 2 is fixed at the top of the wall body, the opening mechanism is fixed below the fixing plate 2, and the opening and closing of the glass 1 are realized through the opening mechanism.

As shown in fig. 2-3, the opening mechanism includes a treading assembly, a limiting assembly and a pulling assembly, the treading assembly includes a limiting plate 3, a pedal 4 and a first spring 5, the limiting plate 3 is disposed below the limiting plate 3, a sliding slot is disposed on the limiting plate 3, one end of the pedal 4 is disposed in the sliding slot, the pedal 4 is slidably connected with the sliding slot, the first spring 5 is disposed in the sliding slot, one end of the first spring 5 is connected with the sliding slot, the other end of the first spring 5 is connected with the pedal 4, the limiting assembly includes two limiting units and a synchronizing unit, the two limiting units are respectively disposed at two sides of the pedal 4, the limiting units include a housing 6, a clamping block 7, a second spring 8 and a limiting rod 9, the housing 6 is disposed in the pedal 4, the top of the housing 6 is open, the clamping block 7 is disposed at the opening, the clamping block 7 is abutted against the shell 6, two clamping grooves are arranged in the sliding groove and are respectively arranged at two ends of the sliding groove, the clamping block 7 is positioned in one clamping groove, the second spring 8 is arranged in the shell 6, one end of the second spring 8 can be connected with the clamping block 7, the other end of the second spring 8 is connected with the shell 6, one end of the limiting rod 9 is positioned in the shell 6 and is connected with the clamping block 7, the other end of the limiting rod 9 penetrates through the shell 6, the limiting rod 9 is in sliding connection with the shell 6, the synchronizing unit comprises a fixed frame 10, a rotating shaft 11, a first reel 12, a fixed block 13, an elastic rope 14, a gear 15 and a rack 16, the fixed frame 10 is arranged between the two shells 6 of the two limiting units, the rotating shaft 11 is arranged in the fixed frame 10, the gear 15 is sleeved on the rotating shaft 11, the gear 15 is in key connection with the rotating shaft 11, the utility model discloses a fixing frame, including casing 6, gag lever post 9, rack 16, two rack 16 set up respectively on two gag lever posts 9, and two rack 16 are located the both sides of gear 15 respectively, gear 15 all with two rack 16 meshes, first drum 12 cover is established on pivot 11,

first drum

12 and 11 key-type connections of pivot, fixed block 13 sets up in fixed frame 10, the one end and the first drum 12 of elasticity rope 14 are connected, the other end and the fixed block 13 of elasticity rope 14 are connected.

When the glass exhaust device is in an initial state, the second spring 8 is in a deformation state, restoring force of the second spring 8 generates outward thrust on the fixture block 7, so that the fixture block 7 is clamped in the clamping groove above the limiting plate 3, when the glass exhaust device needs to be opened, the pedal 4 is trampled, the trampling force on the pedal 4 is larger than the sum of the restoring force of the first spring 5 and the restoring force of the second spring 8, so that the trampling force drives the fixture block 7 to move out of the clamping groove, so that the pedal 4 moves downwards, the pedal 4 drives the pulling assembly to operate, so that the pulling assembly pulls the two pieces of glass 1 to move, so that the glass 1 moves into the groove, so that the opening is opened, smoke exhaust is realized, the pedal 4 drives the limiting assembly to move downwards along with the movement of the pedal 4, when the fixture block 7 moves to the next clamping groove, under the restoring force of the second spring 8, the fixture block 7 is driven to move downwards to be clamped into the clamping groove, thereby realizing the locking of the pedal 4, thereby locking the pulling component, thereby keeping the opening state, wherein the fixture block 7 moves to drive the limiting rod 9 to move, the limiting rod 9 passes through the shell 6, thereby limiting the movement of the limiting rod 9, thereby limiting the movement of the fixture block 7, wherein the limiting rod 9 moves to drive the rack 16 to move, the rack 16 drives the gear 15 to rotate, the gear 15 rotates to drive the other rack 16 to move, the other rack 16 drives the other limiting rod 9 to move, the other limiting block drives the other fixture block 7 to move, thereby enabling the two fixture blocks 7 to move simultaneously, avoiding that the two fixture blocks 7 do not move out of the clamping grooves simultaneously, thereby causing the pedal 4 to be blocked, thereby enabling the device to operate more stably, when the fixture block 7 is not blocked, under the restoring force of the second spring 8, the second spring 8 drives the fixture block 7 to move reversely, so that the limiting rods 9 move reversely, the rack 16 moves reversely, the rack 16 drives the gear 15 to move reversely, so that the clamping blocks 7 are better clamped into the clamping grooves, meanwhile, when the gear 15 rotates forwardly, the first wire coil 12 is driven to rotate, the first wire coil 12 winds the elastic rope 14 onto the wire coil, so that the elastic rope 14 is stretched, the restoring force of the elastic rope 14 generates reverse pulling force on the wire coil, when the clamping blocks 7 are not blocked, the wire coil rotates reversely under the restoring force of the elastic rope 14, so that the rotating shaft 11 rotates reversely, the rotating shaft 11 drives the gear 15 to rotate reversely, so that the two racks 16 move reversely, so that the two limiting rods 9 move reversely, so that the two clamping blocks 7 are better clamped into the clamping grooves, so that a better fixing effect on the pedal 4 is realized, when the opening needs to be closed, trample footboard 4 once more, make fixture block 7 shift out the draw-in groove, footboard 4 drives first spring 5 simultaneously and continues to compress, thereby the restoring force increase of first spring 5, then loosen footboard 4, first spring 5 drives footboard 4 reverse movement, and fixture block 7 is when moving the draw-in groove department of below, the restoring force of first spring 5 is greater than the restoring force sum of each second spring 8 this moment, thereby make fixture block 7 under the restoring force effect of first spring 5, shift out the draw-in groove, thereby make footboard 4 not blocked, thereby make footboard 4 continue reverse movement to the draw-in groove department of top, thereby make the pulling subassembly emit, thereby make two glass 1 be close to each other, thereby seal the opening.

As shown in fig. 1, in order to realize the opening of the glass 1, the pulling assembly includes a rotating unit and a pulling unit, the rotating unit includes a fixed shaft 17, a second wire disc 18 and a first pulling rope 19, the fixed shaft 17 is disposed on the fixed plate 2, the second wire disc 18 is sleeved on the fixed shaft 17, the second wire disc 18 is connected with the fixed shaft 17 in a key manner, one end of the first pulling rope 19 is connected with the second wire disc 18, the other end of the first pulling rope 19 is connected with the pedal 4, there are two pulling units, the two pulling units are respectively disposed corresponding to the two glass 1, the pulling unit includes a third wire disc 20, a second pulling rope 21 and a third spring 22, the third wire disc 20 is sleeved on the fixed shaft 17, the third wire disc 20 is connected with the fixed shaft 17 in a key manner, one end of the second pulling rope 21 is connected with the third wire disc 20, the other end of the second pulling rope 21 extends into the groove to be connected with the glass 1, the third spring 22 is arranged in the groove, one end of the third spring 22 is connected with the groove, and the other end of the third spring 22 is connected with the glass 1.

When the pedal 4 moves downwards, the pedal 4 drives the first pull rope 19 to move, so that the first pull rope 19 on the second wire coil 18 is released, the first pull rope 19 pulls the second wire coil 18 to rotate, the second wire coil 18 drives the fixed shaft 17 to rotate, the fixed shaft 17 drives the two third wire coils 20 to rotate, so that the two second pull ropes 21 are wound on the two third wire coils 20 respectively, so that the two second pull ropes 21 pull the two glass 1 to move reversely, so that the opening is opened, when the pedal 4 moves reversely, the first pull rope 19 is released, so that the second wire coil 18 cannot receive pulling force, so that the fixed shaft 17 and the third wire coils 20 cannot receive pulling force, so that the glass 1 cannot receive the pulling force of the second pull rope 21, at the moment, the third spring 22 is in a deformation state, the restoring force of the third spring 22 generates outward thrust to the glass 1, so that the two glass 1 move out of the groove, close to each other, thereby closing the opening.

In order to better limit the second pull rope 21, a positioning wheel 23 is arranged on the second pull rope 21, the positioning wheel 23 is arranged on the fixing plate 2, the positioning wheel 23 is flush with the glass 1, and the second pull rope 21 bypasses the positioning wheel 23.

When the device is used, the fixing plate 2 is fixed at the top of a wall body, in an initial state, the second spring 8 is in a deformation state, the restoring force of the second spring 8 generates outward thrust on the fixture block 7, so that the fixture block 7 is clamped in the clamping groove above the limiting plate 3, when the device needs to be opened, the pedal 4 is treaded, the treading force on the pedal 4 is larger than the sum of the restoring forces of the first spring 5 and the second spring 8, so that the treading force drives the fixture block 7 to move out of the clamping groove, so that the pedal 4 moves downwards, the pedal 4 drives the first pull rope 19 to move, so that the first pull rope 19 on the second wire coil 18 is released, the second wire coil 18 is pulled to rotate by the first pull rope 19, the second wire coil 18 drives the fixing shaft 17 to rotate, the fixing shaft 17 drives the two third wire coils 20 to rotate, so that the two second pull ropes 21 are respectively wound on the two third wire coils 20, so that the two second pull ropes 21 respectively pull the two glass 1 to move reversely, so that the glass 1 moves into the groove to open the opening and exhaust smoke is discharged, the pedal 4 drives the limiting component to move downwards along with the movement of the pedal 4, when the fixture block 7 moves to the next clamping groove, the second spring 8 drives the fixture block 7 to move downwards under the action of the restoring force of the second spring 8 and then is clamped into the clamping groove, so that the pedal 4 is locked, so that the pulling component is locked, and the opening state is kept, wherein the fixture block 7 moves to drive the limiting rod 9 to move, the limiting rod 9 penetrates through the shell 6 to limit the movement of the limiting rod 9, so that the movement of the fixture block 7 is limited, the limiting rod 9 moves to drive the rack 16 to move, the rack drive gear 15 rotates, the gear 15 rotates to drive the other rack 16 to move, the other rack 16 drives the other limiting rod 9 to move, and the other limiting block 7 drives the other fixture block 7 to move, when the fixture blocks 7 are not blocked, the second spring 8 drives the fixture blocks 7 to move reversely under the action of the restoring force of the second spring 8, so that the limiting rod 9 moves reversely, the rack 16 drives the gear 15 to move reversely, so that the fixture blocks 7 are better clamped into the clamping grooves, meanwhile, when the gear 15 rotates forwardly, the first wire coil 12 is driven to rotate, the first wire coil 12 winds the elastic rope 14 on the wire coil, so that the elastic rope 14 is stretched, the restoring force of the elastic rope 14 generates reverse tension to the wire coil, when the fixture blocks 7 are not blocked, the wire coil rotates reversely under the action of the restoring force of the elastic rope 14, so that the rotating shaft 11 rotates reversely, and the rotating shaft 11 drives the gear 15 to rotate reversely, so that the two racks 16 move reversely, so that the two limit rods 9 move reversely, so that the two fixture blocks 7 are better clamped into the clamping grooves, thereby achieving a better fixing effect on the pedal 4, when the opening needs to be closed, the pedal 4 is treaded again, so that the fixture blocks 7 move out of the clamping grooves, meanwhile, the pedal 4 drives the first spring 5 to continue to compress, so that the restoring force of the first spring 5 is increased, then the pedal 4 is loosened, the first spring 5 drives the pedal 4 to move reversely, and when the fixture blocks 7 move to the lower clamping grooves, the restoring force of the first spring 5 is greater than the sum of the restoring forces of the second springs 8, so that the fixture blocks 7 move out of the clamping grooves under the action of the restoring force of the first spring 5, so that the pedal 4 is not blocked, so that the pedal 4 continues to move reversely to the upper clamping grooves, so that the first pulling rope 19 is released, the second wire coil 18 is not pulled, the fixed shaft 17 and the third wire coil 20 are not pulled, the glass 1 is not pulled by the second pulling rope 21, the third spring 22 is in a deformation state, the restoring force of the third spring 22 generates outward pushing force on the glass 1, and the two glasses 1 move out of the groove and approach each other, so that the opening is sealed.

Compared with the prior art, this trample open-type skylight of discharging fume, realize opening and closing of glass 1 through opening mechanism, thereby realize discharging fume, compare with current opening mechanism, this mechanism replaces the hand operation with the mode of trampling, bowing has been avoided, the manpower has been saved, compare with current spacing subassembly, this subassembly passes through spring and elasticity rope 14 and carries out multiple spacing to fixture block 7, thereby realize better fixed spacing effect, carry out synchronous motion to two fixture blocks 7 through the synchronizing unit simultaneously, thereby avoid footboard 4 card to die, make the device operation more stable, compare with current pulling subassembly, this pulling subassembly adopts the bi-parting door structure, the opening is opened closing speed has been improved, the efficiency is improved.

In light of the foregoing, it will be apparent to those skilled in the art from this disclosure that various changes and modifications can be made without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.

Claims

1. A trample open type smoke exhaust skylight is characterized by comprising glass (1), a fixed plate (2) and an opening mechanism, wherein an opening is formed in the fixed plate (2), the glass (1) is arranged at the opening, grooves are formed in two sides of the opening, two pieces of glass (1) are arranged in the two grooves, one end of the glass (1) is located in the groove, the other end of the glass (1) extends out of the groove, the glass (1) is connected with the grooves in a sliding mode, one ends of the two pieces of glass (1) located outside the grooves are attached, and the opening mechanism is arranged on the fixed plate (2);

the opening mechanism comprises a treading assembly, a limiting assembly and a pulling assembly, the treading assembly comprises a limiting plate (3), a pedal (4) and a first spring (5), the limiting plate (3) is arranged below the limiting plate (3), a sliding groove is formed in the limiting plate (3), one end of the pedal (4) is located in the sliding groove, the pedal (4) is connected with the sliding groove in a sliding mode, the first spring (5) is arranged in the sliding groove, one end of the first spring (5) is connected with the sliding groove, the other end of the first spring (5) is connected with the pedal (4), the limiting assembly comprises two limiting units and two synchronizing units, the two limiting units are respectively arranged on two sides of the pedal (4), each limiting unit comprises a shell (6), a clamping block (7), a second spring (8) and a limiting rod (9), the shell (6) is arranged in the pedal (4), the open-top of casing (6), fixture block (7) set up at the opening part, fixture block (7) support with casing (6) and lean on, be equipped with two draw-in grooves in the spout, two draw-in grooves set up the both ends at the spout respectively, fixture block (7) are located one of them draw-in groove, second spring (8) set up in casing (6), the one end of second spring (8) can be connected with fixture block (7), the other end and the casing (6) of second spring (8) are connected, the one end of gag lever post (9) is located casing (6) and is connected with fixture block (7), casing (6) are passed to the other end of gag lever post (9), gag lever post (9) and casing (6) sliding connection, synchronizing unit is including fixed frame (10), pivot (11), first drum (12), fixed block (13), elasticity rope (14), Gear (15) and rack (16), fixed frame (10) sets up between two casings (6) of two spacing units, pivot (11) set up in fixed frame (10), gear (15) cover is established on pivot (11), gear (15) and pivot (11) key-type connection, gag lever post (9) are located the outer one end of casing (6) and stretch into fixed frame (10), rack (16) have two, and two rack (16) set up respectively on two gag lever posts (9), and two rack (16) are located the both sides of gear (15) respectively, gear (15) all with two rack (16) meshing, first drum (12) cover is established on pivot (11), first drum (12) and pivot (11) key-type connection, fixed block (13) set up in fixed frame (10), the one end and first drum (12) of elasticity rope (14) are connected, the other end of the elastic rope (14) is connected with the fixed block (13).

2. The tread-open type smoke evacuation skylight according to claim 1, wherein the pulling assembly comprises a rotating unit and a pulling unit, the rotating unit comprises a fixed shaft (17), a second wire coil (18) and a first pulling rope (19), the fixed shaft (17) is arranged on the fixed plate (2), the second wire coil (18) is sleeved on the fixed shaft (17), the second wire coil (18) is connected with the fixed shaft (17) in a key mode, one end of the first pulling rope (19) is connected with the second wire coil (18), the other end of the first pulling rope (19) is connected with the pedal (4), the pulling unit comprises two pulling units, the two pulling units are respectively arranged corresponding to the two glass (1), the pulling unit comprises a third wire coil (20), a second pulling rope (21) and a third spring (22), the third wire coil (20) is sleeved on the fixed shaft (17), third drum (20) and fixed axle (17) key-type connection, the one end and the third drum (20) of second stay cord (21) are connected, the other end of second stay cord (21) stretches into in the recess and is connected with glass (1), third spring (22) set up in the recess, the one end and the groove connection of third spring (22), the other end and the glass (1) of third spring (22) are connected.

3. A tread-open smoke evacuation skylight according to claim 2, characterized in that the second rope (21) is provided with a positioning wheel (23), the positioning wheel (23) is arranged on the fixing plate (2), the positioning wheel (23) is flush with the glass (1), and the second rope (21) is wound around the positioning wheel (23).