CN116119567A

CN116119567A - Electronic folding attic stair

Info

Publication number: CN116119567A
Application number: CN202310094367.3A
Authority: CN
Inventors: 任中群; 沈彩娥; 陈琦; 陈新源; 周林
Original assignee: Zhongyida Construction Group Co ltd
Current assignee: Zhongyida Construction Group Co ltd
Priority date: 2023-02-03
Filing date: 2023-02-03
Publication date: 2023-05-16
Anticipated expiration: 2043-02-03
Also published as: CN116119567B

Abstract

The utility model relates to a house structure field especially relates to an electronic folding attic stair, and it includes the house main part, be connected with the floor in the house main part, the floor separates the house main part for mainlayer and attic, be provided with the opening on the floor, be connected with elevator group on the floor, elevator group includes the mounting bracket and connects the frame plate on the mounting bracket along mounting bracket length direction, the mounting bracket along vertical direction with the floor is connected, the mounting bracket runs through the opening, be connected with elevating gear on the floor, this application has the effect of the security that improves to carrying goods in the attic.

Description

Electronic folding attic stair

Technical Field

The application relates to the field of building structures, in particular to an electric folding attic stair.

Background

The attic, namely the room located at the lower part of the house sloping roof, is a building structure, namely the space of the building is higher, and a layer of attic floor slab is manufactured again in the middle. Attics are commonly used in private spaces for storage, office, living, etc.

Stairs are functional structures connecting attic space with the main body space of a house, and for houses with large main body space, fixed escalators are usually provided. For houses with smaller main body space, attics are often used as storage warehouses, and in order to improve space utilization, a stair structure with a fixed structure is not arranged in the house, but temporary space connection, such as a herringbone ladder, is realized by adopting a folding ladder tool.

In view of the above-mentioned related art, the inventors consider that there is a drawback in that, in a house having a small main body space, the security of entry into the attic through the herringbone ladder is not high in the process of transporting the article into the attic.

Disclosure of Invention

In order to improve the safety of carrying goods into the attic, the application provides an electric folding attic stair.

The application provides an electronic folding attic stair adopts following technical scheme:

the utility model provides an electronic folding attic stair, includes house main part, house main part in-connection has the floor, the floor separates the house main part into mainlayer and attic, be provided with the opening on the floor, be connected with the companion ladder group on the floor, companion ladder group includes the mounting bracket and follows the frame plate of mounting bracket length direction connection on the mounting bracket, the mounting bracket along vertical direction with the floor is connected, the mounting bracket runs through the opening, be connected with elevating gear on the floor.

Through adopting above-mentioned technical scheme, can carry the goods through the frame plate operator and step on the companion ladder group, remove companion ladder group to the attic from the main floor through elevating gear, compare in the operator carries the goods climbing double ladder, carry the holistic removal of goods through companion ladder group, improved the security of the process that the operator carried goods to the attic.

Optionally, the mounting bracket includes roof-rack, chassis and erects the frame, elevating gear includes the support column and is used for driving support column pivoted second drive source, be provided with the screw thread on the support column, the support column rotates to be connected on house main part, be provided with the screw hole on the roof-rack, erect the setting of frame cavity, the support column runs through screw hole and erects the frame, the support column passes through screw hole and roof-rack threaded connection.

Through adopting above-mentioned technical scheme, rotate the support column through the second actuating source, under the screw-thread fit effect of screw hole and support column, the axial displacement of support column is followed to the mounting bracket to be convenient for remove the elevator group from the main floor to in the attic.

Optionally, erect the frame and include mount and expansion bracket, the one end and the roof-rack of expansion bracket are articulated, the one end and the chassis of mount are articulated, the one end and the mount grafting cooperation of roof-rack are kept away from to the expansion bracket, the axial sliding connection of expansion bracket and mount along the mount, the mounting bracket still includes expansion device, expansion device is used for adjusting the interval between expansion bracket and the mount, the chassis is along horizontal direction sliding fit with the bottom on major layer.

Through adopting above-mentioned technical scheme, after the chassis of elevator group and the bottom butt on main floor, through the interval between expansion device regulation expansion bracket and the mount, take place relative rotation between expansion bracket and the roof-rack, take place relative rotation between mount and the chassis, erect the frame slope to make elevator group expand to the incline condition, the frame plate on the elevator group is arranged along vertical direction by originally, moves to the state of staggering each other in the level is reverse, thereby the operator of being convenient for scrambles.

Optionally, the expansion device includes first rack, second rack, gear and is used for driving gear pivoted first actuating source, first rack is articulated with the roof-rack, the second rack is articulated with the chassis, the articulated point of first rack and roof-rack, the articulated point of second rack and chassis are crisscross to be set up, be connected with mounting panel 7 between the mount, gear rotation connects on mounting panel 7, the elastic component is used for pushing the second rack towards the gear, first rack and second rack are along its length direction sliding connection, first rack, second rack are located the both sides of gear and with gear engagement.

Through adopting above-mentioned technical scheme, rotate the gear, first rack and second rack keep away from each other or are close to the removal to expand the interval between roof-rack and the chassis, realize the regulation of the interval between expansion bracket and the mount.

Optionally, the frame plate includes plate body and first guardrail group, the frame plate articulates with erectting the frame, first guardrail group includes two relative first breast boards that set up and articulates with the plate body, be connected with the turning device who is used for turning over first breast board on the plate body.

Through adopting above-mentioned technical scheme, rotate first breast board to the state mutually perpendicular with the plate body, place the goods on the plate body, the setting of first breast board has reduced the possibility that the goods dropped from the plate body.

Optionally, turning device includes regulation pole and regulating block, it connects on the frame plate to adjust the pole rotation, the axial of adjusting the pole is mutually perpendicular with the articulated shaft axial of first fence, be provided with two sections screw threads that revolve opposite directions on adjusting the pole, regulating block threaded connection is on two sections screw threads that revolve opposite directions on adjusting the pole, axial sliding connection along adjusting the pole is followed to regulating block and plate body, articulated between regulating block and the first fence has the connecting rod.

Through adopting above-mentioned technical scheme, rotate the regulation pole, the regulating block is kept away from each other or is close to the removal along the length direction of regulating lever, and the regulating block is close to when the pin joint between first breast board and the plate body removes, and the connecting rod rotates, and the connecting rod props up first breast board, and the plate body rotates is kept away from to first breast board to be convenient for overturn first breast board.

Optionally, the frame plate still includes second guardrail group, second guardrail group includes two second breast boards of relative setting, first breast board and second breast board mutually perpendicular set up, the second breast board is articulated with the plate body, sliding connection has and sets up the slider with the second breast board corresponds on the plate body, the direction of movement of slider is perpendicular with the axial of adjusting the pole, be connected with the linkage board on the regulating block, the linkage board slope sets up, be provided with waist shape hole on the linkage board, be connected with the lug on the slider, the lug is located waist shape downthehole and with waist shape hole sliding connection, also articulated between slider and the second breast board has the connecting rod.

Through adopting above-mentioned technical scheme, when the regulating block is close to the pin joint between first breast board and the plate body and removes, the one end that the regulating block was kept away from to the linkage board is close to the pin joint between second breast board and the plate body and removes, and the lug is close to the pin joint between second breast board and the plate body under the support of kidney-shaped hole to make the slider move towards the pin joint between second breast board and the plate body, under the effect of connecting rod, make second breast board upset, thereby realize the linkage of first breast board and second breast board.

Optionally, the one end that the mounting bracket is close to ground is connected with the shrouding, the shrouding is used for shielding the opening, be connected with light and guard ring on the shrouding, the light runs through the guard ring, the guard ring rotates with the shrouding to be connected.

By adopting the technical scheme, when the elevator group is in a vertical state, the elevator group moves into the attic through the lifting device, the sealing plate seals the through hole, and the illuminating lamp plays a role in illumination; when the underframe is close to the ground, the protection ring is abutted with the bottom surface of the main layer, when the expansion device pushes the expansion bracket to move away from the fixed frame, the elevator group is inclined, the underframe rolls on the bottom surface of the main layer through the protection ring, and the protection ring plays a role in protecting the lighting lamp.

In summary, the present application includes at least one of the following beneficial technical effects:

1. the frame plate operators can carry goods to climb the elevator group, the elevator group is moved to the attic from the main layer through the elevator device, and compared with the process that the operators carry the goods to climb the herringbone ladder, the safety of the process that the operators carry the goods to the attic is improved through the integral movement of the elevator group;

2. when the bottom frame of the elevator group is abutted with the bottom of the main layer, the distance between the telescopic frame and the fixed frame is adjusted through the expansion device, the telescopic frame and the top frame rotate relatively, the fixed frame and the bottom frame rotate relatively, the vertical frame inclines, so that the elevator group is unfolded to an inclined state, the frame plates on the elevator group are originally arranged along the vertical direction and move to a state staggered mutually in the horizontal direction, and an operator can climb conveniently;

3. when the adjusting block moves close to the hinge point between the first breast board and the board body, one end of the linkage board, which is far away from the adjusting block, moves close to the hinge point between the second breast board and the board body, and the convex block moves close to the hinge point between the second breast board and the board body under the abutting of the kidney-shaped hole, so that the sliding block moves towards the hinge point between the second breast board and the board body, and under the action of the connecting rod, the second breast board overturns, so that the linkage of the first breast board and the second breast board is realized.

Drawings

FIG. 1 is a schematic view of a structure for embodying an electrically powered folding attic stair in an upright position;

FIG. 2 is a schematic view of a structure for embodying an electrically powered folding attic stair in an inclined position;

FIG. 3 is an enlarged view of section A for embodying the positional relationship between the dovetail block and the dovetail groove of FIG. 1;

FIG. 4 is a schematic diagram for embodying the positional relationship between the first rail plate and the second rail plate;

fig. 5 is a schematic view for embodying the positional relationship between the mounting groove and the adjustment lever.

Reference numerals illustrate:

1. a house main body; 2. a main layer; 3. attic; 4. a floor slab; 5. a through port; 6. an elevator group; 7. a mounting plate; 8. a frame plate; 9. a top frame; 10. a chassis; 11. a telescopic frame; 12. a fixing frame; 13. a thread cylinder; 14. a first connecting rod; 15. a second connecting rod; 16. a first rack; 17. a second rack; 18. a gear; 19. a speed reducer; 20. dovetail blocks; 21. a dovetail groove; 22. a plate body; 23. a first breast board; 24. a second breast board; 25. a mounting groove; 26. a chute; 27. an adjusting rod; 28. an adjusting block; 29. a slide block; 30. a connecting rod; 31. a linkage plate; 32. waist-shaped holes; 33. a bump; 34. a top plate; 35. a sliding port; 36. a sealing plate; 37. a lighting lamp; 38. a fixing ring; 39. a guard ring; 40. an avoidance groove; 41. a support column; 42. a driving machine; 43. a driving wheel; 44. a driving belt.

Description of the embodiments

The embodiment of the application discloses an electronic folding attic stair.

Referring to fig. 1, an electric folding attic stair comprises a house main body 1, wherein a floor slab 4 is connected in the house main body 1, the floor slab 4 divides the house main body 1 into a main layer 2 and an attic 3, and a through hole 5 is formed in the floor slab 4.

Referring to fig. 1, a floor slab 4 is connected with an elevator group 6 through a lifting device, the elevator group 6 comprises a mounting frame and a frame plate 8 connected to the mounting frame along the length direction of the mounting frame, the mounting frame is connected with the floor slab 4 along the vertical direction, and the mounting frame penetrates through the hole 5.

Referring to fig. 1 and 2, the mounting bracket includes roof-rack 9, chassis 10 and erects the frame, erects the frame and is provided with four, erects the frame and set up between roof-rack 9 and chassis 10, erects the frame and includes expansion bracket 11 and mount 12, and roof-rack 9 sets up to the frame form, and the corner an organic whole at roof-rack 9 top is connected with the screwed pipe, is provided with the screw hole on the roof-rack 9, and the screw hole sets up with the inside wall coaxial of screwed pipe. The telescopic frame 11 and the fixed frame 12 are coaxially arranged, the telescopic frame 11 and the fixed frame 12 are both hollow, one end of the telescopic frame 11 is hinged with the top frame 9, and when the top of the telescopic frame 11 is abutted with the top frame 9, the telescopic frame 11 and the threaded hole are coaxially arranged; one end of the fixing frame 12 is hinged with the underframe 10, one end of the telescopic frame 11 far away from the top frame 9 is inserted into the fixing frame 12 and is in sliding connection with the fixing frame 12 along the axial direction of the fixing frame 12, when the end of the fixing frame 12 is abutted with the underframe 10, the fixing frame 12 and the telescopic frame 11 are vertically arranged, and the fixing frame 12, the telescopic frame 11 and the threaded holes are coaxially arranged.

Referring to fig. 1, 2 and 3, expansion devices are further connected between the top frame 9 and the bottom frame 10, the two expansion devices are arranged on two sides of the top frame 9, the expansion devices comprise a first rack 16, a second rack 17, a gear 18 and a first driving source for driving the gear 18 to rotate, two ends of one side of the top frame 9, which faces the side wall of the bottom frame 10, are hinged with a first connecting rod 14, the first rack 16 is integrally connected with one end of the first connecting rod 14, which is far away from the top frame 9, the two ends of one side, which faces the side wall of the bottom frame 9, which is far away from the hinge point of the first connecting rod 14 and the top frame 9, are hinged with a second connecting rod 15, the second rack 17 is integrally connected with one end of the second connecting rod 15, which is far away from the bottom frame 10, the first rack 16 and the second rack 17 are oppositely arranged, the side wall of the first connecting rod 14, which faces the first connecting rod 14, and the side wall of the second connecting rod 15, which faces the first connecting rod 14, are both connected with a dovetail block 20, the first connecting rod 14 and the second connecting rod 15 are provided with a dovetail groove 21 along the length direction, and the dovetail block 20 is located in the dovetail groove 21 and matched with the dovetail groove 21 in a sliding way. The mounting plate 7 is connected to the position on the mount 12, which is close to the telescopic frame 11, the gear 18 is rotationally connected to the mounting plate 7, a mounting cavity is arranged in the mounting plate 7, the first driving source is a speed reducer 19, the speed reducer 19 is positioned in the mounting cavity and is connected with the gear 18, the first rack 16 and the second rack 17 are positioned on two sides of the gear 18, and the first rack 16 is meshed with the second rack 17.

Referring to fig. 1 and 4, the shelf 8 includes a plate body 22, a first rail group and a second rail group, the shelf 8 is provided with at least two along a length direction of the vertical frame, the shelf 8 is hinged with the vertical frame, the first rail group includes two first rail plates 23 which are oppositely arranged and is hinged with the plate body 22, the second rail group includes two second rail plates 24 which are oppositely arranged, the first rail plates 23 and the second rail plates 24 are mutually perpendicular, and the second rail plates 24 are hinged with the plate body 22.

Referring to fig. 4 and 5, the turning device for turning the first rail plate 23 is connected to the plate body 22, the turning device comprises an adjusting rod 27 and an adjusting block 28, a mounting groove 25 is formed in the frame plate 8, the adjusting rod 27 is rotatably connected to the bottom of the mounting groove 25, a motor for driving the adjusting rod 27 to rotate is connected to the side wall of the mounting groove 25, the axial direction of the adjusting rod 27 is perpendicular to the axial direction of the hinge shaft of the first rail plate 23, two sections of threads with opposite rotation directions are formed in the adjusting rod 27, the adjusting block 28 is in threaded connection with the two sections of threads with opposite rotation directions on the adjusting rod 27, the adjusting block 28 is in sliding connection with the plate body 22 along the axial direction of the adjusting rod 27, a sliding groove 26 is formed in the bottom of the mounting groove 25, the length direction of the sliding groove 26 is perpendicular to the axial direction of the adjusting rod 27, the section of the sliding groove 26 is in a dovetail shape, a sliding block 29 is correspondingly arranged on the plate body 22, the moving direction of the sliding block 29 is perpendicular to the axial direction of the adjusting rod 27, the bottom of the sliding block 29 is connected with a sliding block, the sliding block is in a dovetail shape, the sliding block is positioned in the sliding groove 26 and is in sliding fit with the sliding groove 26, the sliding block 28 is in sliding connection with the sliding groove 26, the sliding block 31 is in the sliding groove 31 is far away from the second rail plate 24, the sliding block 32 is in the sliding groove 32, and is in the sliding hole 32 is in the sliding groove 32, and is in the sliding connection with the sliding groove 32, and is in the sliding groove 33, and is in the sliding groove 33 is in the sliding groove and is in the sliding groove. The plate body 22 is connected with a top plate 34 for covering the mounting groove 25, the top plate 34 is provided with a sliding opening 35, the sliding opening 35 is in a cross shape, and the connecting rod 30 penetrates through the sliding opening 35 and is in sliding fit with the sliding opening 35.

When the motor drives the adjusting rod 27 to rotate, the adjusting blocks 28 move away from or close to each other, when the adjusting blocks 28 move close to the hinge point between the first baffle plate 23 and the plate body 22, one end of the linkage plate 31 away from the adjusting blocks 28 moves close to the hinge point between the second baffle plate 24 and the plate body 22, the protruding blocks 33 move close to the hinge point between the second baffle plate 24 and the plate body 22 under the abutting of the kidney-shaped holes 32, so that the sliding blocks 29 move towards the hinge point between the second baffle plate 24 and the plate body 22, the adjusting blocks 28 and the sliding blocks 29 move away from the axis position of the plate body 22 at the same time, under the action of the connecting rods 30, the first baffle plate 23 and the second baffle plate 24 are overturned at the same time, and therefore linkage of the first baffle plate 23 and the second baffle plate 24 is achieved, and the first baffle plate 23 and the second baffle plate 24 are unfolded to form a fence.

Referring to fig. 2, a sealing plate 36 is integrally connected to the chassis 10, the sealing plate 36 is used for shielding the through hole 5, an illuminating lamp 37 and a protecting ring 39 are connected to the sealing plate 36, a fixing ring 38 is connected to the bottom of the sealing plate 36, the illuminating lamp 37 penetrates through the fixing ring 38, an avoiding groove 40 is formed in the sealing plate 36, the protecting ring 39 and the fixing ring 38 are coaxially arranged, the protecting ring 39 is sleeved on the fixing ring 38 and is connected with the fixing ring 38 in a rotating mode, and the protecting ring 39 is in sliding fit with the avoiding groove 40.

Referring to fig. 1 and 2, the lifting device comprises a support column 41 and a second driving source for driving the support column 41 to rotate, the second driving source is a driving machine 42, the driving machine 42 is connected to the top of the attic 3, the support column 41 is provided with four support columns, the support column 41 and the threaded pipe are coaxially arranged, threads are arranged on the support column 41, one end of the support column 41 is rotationally connected to the top of the attic 3, one support column 41 is connected with the driving machine 42, the other end of the support column 41 is in threaded connection with the threaded cylinder 13, a driving wheel 43 is coaxially connected to the support column 41, the driving wheel 43 is arranged close to the top of the attic 3, and the driving wheels 43 are connected through a driving belt 44.

The implementation principle of the electric folding attic stair is as follows:

when goods are required to be carried into the attic 3, the driving machine 42 is started, the driving machine 42 drives the supporting columns 41 connected with the driving machine to rotate, and under the transmission of the transmission wheel 43 and the transmission belt 44, the four supporting columns 41 synchronously rotate, so that the threaded cylinder 13 drives the elevator group 6 to move in the vertical direction until the protection ring 39 abuts against the bottom surface of the main layer 2.

At this time, the operator can unfold the first balustrade 23 and the second balustrade 24 by the turning device, then directly place the goods on the board 22, and move the goods to the attic 3 for storage by the elevator group 6 again by the lifting device.

In addition, when the protection ring 39 is abutted to the bottom surface of the main layer 2, an operator can also start the speed reducer 19, the speed reducer 19 drives the gear 18 to rotate, the first rack 16 and the second rack 17 are far away from or close to each other along the length direction of the speed reducer, the dovetail block 20 moves in the dovetail groove 21, the first rack 16 and the top frame 9 relatively rotate, the second rack 17 and the bottom frame 10 relatively rotate, so that the telescopic frame 11 and the fixed frame 12 are far away from each other, the telescopic frame 11 and the top frame 9 relatively rotate, the fixed frame 12 and the bottom frame 10 relatively rotate, the bottom frame 10 slides on the bottom surface of the main layer 2 through the protection ring 39, and therefore the elevator group 6 is inclined, the frame plates 8 are staggered, and the operator can conveniently climb into the attic 3. Operators can place the goods on plate body 22 when in-service use, climb to in the attic 3 through the elevator group 6 that the slope set up, then control expansion device for elevator group 6 resumes to vertical state, in making elevator group 6 carry the goods to rise to attic 3 through elevating gear, thereby compare in that the operator carries the goods climbing double ladder to get into attic 3, carry the holistic removal of goods through elevator group 6, improved the security of the process of operator's transport goods to attic 3.

Claims

1. The utility model provides an electronic folding attic stair, includes house main part (1), house main part (1) internal connection has floor (4), floor (4) separate house main part (1) into main layer (2) and attic (3), be provided with on floor (4) through-hole (5), its characterized in that: be connected with elevator group (6) on floor (4), elevator group (6) include the mounting bracket and connect frame plate (8) on the mounting bracket along mounting bracket length direction, the mounting bracket along vertical direction with floor (4) are connected, mounting bracket penetration hole (5), be connected with elevating gear on floor (4).

2. An electrically powered folding attic stair as in claim 1, wherein: the mounting frame comprises a top frame (9), a bottom frame (10) and a vertical frame, the lifting device comprises a support column (41) and a second driving source for driving the support column (41) to rotate, threads are arranged on the support column (41), the support column (41) is rotationally connected to a house main body (1), threaded holes are formed in the top frame (9), the vertical frame is hollow, the support column (41) penetrates through the threaded holes and the vertical frame, and the support column (41) is in threaded connection with the top frame (9) through the threaded holes.

3. An electrically powered folding attic stair as in claim 2, wherein: the vertical frame comprises a fixing frame (12) and a telescopic frame (11), one end of the telescopic frame (11) is hinged to a top frame (9), one end of the fixing frame (12) is hinged to a bottom frame (10), one end of the telescopic frame (11) away from the top frame (9) is in plug-in fit with the fixing frame (12), the telescopic frame (11) and the fixing frame (12) are in sliding connection along the axial direction of the fixing frame (12), the fixing frame further comprises an expansion device, the expansion device is used for adjusting the distance between the telescopic frame (11) and the fixing frame (12), and the bottom of the bottom frame (10) and the bottom of a main layer (2) are in sliding fit along the horizontal direction.

4. A power operated folding attic stair according to claim 3, wherein: the expansion device comprises a first rack (16), a second rack (17), a gear (18) and a first driving source for driving the gear (18) to rotate, wherein the first rack (16) is hinged to a top frame (9), the second rack (17) is hinged to a bottom frame (10), the hinge points of the first rack (16) and the top frame (9), the hinge points of the second rack (17) and the bottom frame (10) are staggered, a mounting plate 7 is connected between the fixing frames (12), the gear (18) is rotationally connected to the mounting plate 7, an elastic piece is used for pushing the second rack (17) towards the gear (18), the first rack (16) and the second rack (17) are slidably connected along the length direction of the gear, and the first rack (16) and the second rack (17) are located on two sides of the gear (18) and meshed with the gear (18).

5. An electrically powered folding attic stair as in claim 1, wherein: the frame plate (8) comprises a plate body (22) and a first guardrail group, the frame plate (8) is hinged with the vertical frame, the first guardrail group comprises two oppositely arranged first guardrail plates (23) and is hinged with the plate body (22), and a turnover device for turning over the first guardrail plates (23) is connected to the plate body (22).

6. An electrically powered folding attic stair as in claim 5, wherein: the turnover device comprises an adjusting rod (27) and an adjusting block (28), the adjusting rod (27) is rotationally connected to the frame plate (8), the axial direction of the adjusting rod (27) is perpendicular to the axial direction of a hinge shaft of the first fence plate (23), two sections of threads with opposite rotation directions are arranged on the adjusting rod (27), the adjusting block (28) is in threaded connection with two sections of threads with opposite rotation directions on the adjusting rod (27), the adjusting block (28) and the plate body (22) are in sliding connection with the axial direction of the adjusting rod (27), and a connecting rod (30) is hinged between the adjusting block (28) and the first fence plate (23).

7. An electrically powered folding attic stair as in claim 6, wherein: the frame plate (8) further comprises a second guardrail group, the second guardrail group comprises two second guardrail plates (24) which are oppositely arranged, the first guardrail plates (23) and the second guardrail plates (24) are arranged perpendicular to each other, the second guardrail plates (24) are hinged to the plate body (22), sliding connection on the plate body (22) is provided with sliding blocks (29) which are corresponding to the second guardrail plates (24), the moving direction of the sliding blocks (29) is perpendicular to the axial direction of the adjusting rods (27), the adjusting blocks (28) are connected with linkage plates (31), the linkage plates (31) are obliquely arranged, kidney-shaped holes (32) are formed in the linkage plates (31), protruding blocks (33) are connected onto the sliding blocks (29), and the protruding blocks (33) are located in the kidney-shaped holes (32) and are in sliding connection with the kidney-shaped holes (32), and connecting rods (30) are hinged between the sliding blocks (29) and the second guardrail plates (24).

8. An electrically powered folding attic stair as in claim 1, wherein: the mounting bracket is close to one end on ground and is connected with shrouding (36), shrouding (36) are used for shielding opening (5), be connected with light (37) and guard ring (39) on shrouding (36), light (37) run through guard ring (39), guard ring (39) are connected with shrouding (36) rotation.