A hidden multi-stage limit support device for externally hung windows

Abstract

When the window sash and the window frame are closed to a fully closed state, the first locking structure and the second locking structure are in an unlocked state, and the multi-stage limiting function can be realized again during the next window opening process.

Description

Technical Field

[0001] The present invention relates to the technical field of door and window accessories, and in particular to a hidden multi-stage limiting support device for an externally hung window. Background Art

[0002] As a window and door product, outboard windows have relatively low demand and are considered a complementary accessory. However, they perform a crucial function and are essential for building exterior enclosures. They offer numerous advantages: they open outward from the bottom, with the opening facing downward, effectively draining rainwater; opening outward frees up interior space; and when the sash is high, the handles on casement windows are positioned high and out of reach. The handles on outboard windows, however, are located on the bottom, effectively solving the problem of opening tall sashes. However, outboard windows face the challenge of securing the window opening position: their hardware supports typically hinge on friction hinges. Once the window is opened, the friction resistance of the hinges on both sides holds the sash in place, ensuring ventilation. However, when outdoor wind pressure is high, the hinge friction resistance cannot overcome the wind pressure, forcing the window to close automatically. In strong winds, the sash can drop rapidly, causing the glass to shatter. Summary of the Invention

[0003] In order to solve the problem that the window sash is forced to close automatically or even fall back rapidly when the wind force is strong, causing the sash glass to shatter, the purpose of the present invention is to provide a hidden multi-stage limit support device for an externally hung window.

[0004] In order to achieve the above object, the technical solution adopted by the present invention is:

[0005] A hidden multi-stage limit support device for an externally hung window, comprising:

[0006] a first fixing connecting piece 1 and a second fixing connecting piece 2, wherein the first fixing connecting piece 1 is mounted on the window sash, and the second fixing connecting piece 2 is mounted on the window frame;

[0007] The telescopic rod 3, the support base 4 and the support sleeve 5, one end of the support base 4 is rotatably connected to the second fixed connecting piece 2, one end of the support sleeve 5 is connected to the other end of the support base 4, one end of the telescopic rod 3 is disposed in the support sleeve 5 and can be operated to slide along the support sleeve 5, and the other end of the telescopic rod 3 is rotatably connected to the first fixed connecting piece 1;

[0008] The sliding locking member 7 and the supporting clamp 8 are both arranged in the supporting sleeve 5. The sliding locking member 7 is provided with a first locking structure 701 and a sliding limit portion 702. The supporting clamp 8 is provided with a second locking structure 801 and a locking limit portion 802. The first locking structure 701 and the second locking structure 801 match each other. The sliding locking member 7 can be operated to slide along the supporting sleeve 5. The lower side of one end of the telescopic rod 3 is provided with a limiting sliding member. Slot 301, the sliding limit portion 702 is arranged in the limiting sliding slot 301, and the sliding distance of the sliding locking member 7 in the support sleeve 5 is limited by the limiting sliding slot 301. One end of the telescopic rod 3 is rotatably connected to the end of the support clamp 8. A plurality of limiting slots 502 are opened on the support sleeve 5, and each of the limiting slots 502 matches the locking limit portion 802. The telescopic rod 3 located in the support sleeve 5 is limited by the support clamp 8;

[0009] A first spring support piece 6 is installed in the limiting sliding groove 301 , with one end of the first spring support piece 6 abutting against the groove wall of the limiting sliding groove 301 and the other end of the first spring support piece 6 abutting against the sliding limiting portion 702 ;

[0010] The second spring support piece 9 is arranged between the sliding locking piece 7 and the support clamp 8. One end of the second spring support piece 9 is against the sliding locking piece 7, and the other end of the second spring support piece 9 is against the support clamp 8. The second spring support piece 9 pushes the support clamp 8 to rotate so that the locking limit part 802 is stuck in any one of the limit grooves 502.

[0011] The above-mentioned hidden multi-stage limiting support device for the external hanging window also includes: a riveted pin 10, the first fixed connecting piece 1 and the telescopic rod 3 are rotatably connected through one of the riveted pins 10, and the support seat 4 and the second fixed connecting piece 2 are rotatably connected through another of the riveted pins 10.

[0012] The above-mentioned hidden multi-stage limiting support device for the externally hung window further includes: a rivet pin 11, and the support seat 4 and the support sleeve 5 are connected by the rivet pin 11.

[0013] The above-mentioned hidden multi-stage limiting support device for the externally hung window, wherein the first fixed connecting piece 1 and the window sash are connected by screws, and the second fixed connecting piece 2 and the window frame are connected by screws.

[0014] The above-mentioned hidden multi-stage limit support device for externally hung windows, wherein the support sleeve 5 includes: a top plate, a bottom plate and a side plate, and a slide is formed by the top plate, the bottom plate and the two side plates. One end of the telescopic rod 3 is arranged in the slide and can be operated to slide along the slide. A plurality of limit grooves 502 are provided on the top plate, and a locking limit portion 802 is provided on the upper surface of the support clip 8, and the locking limit portion 802 is against the top plate.

[0015] The above-mentioned hidden multi-stage limit support device for the external hanging window, wherein the sliding locking component 7 is operably slidable along the upper surface of the base plate, the support clamp 8 is arranged above the sliding locking component 7, and the upper surface of the support clamp 8 is provided with a first inclined surface 803 smoothly connected to the locking limit portion 802, and one end of the telescopic rod 3 is provided with a second inclined surface 302, the first inclined surface 803 and the second inclined surface 302 match, and the rotation angle of the support clamp 8 is limited by the second inclined surface 302.

[0016] The above-mentioned hidden multi-stage limiting support device for externally hung windows, wherein a limiting end portion 501 is provided on the lower surface of the top plate near one end of the first fixed connecting piece 1. When the window sash and the window frame are in a fully open state, the distance between the first fixed connecting piece 1 and the second fixed connecting piece 2 is at the maximum distance, the limiting end portion 501 abuts against the first inclined surface 803, the second spring support piece 9 is in a compressed state, the locking limiting portion 802 is separated from the top plate, and the first locking structure 701 and the second locking structure 801 are in a locked state.

[0017] The above-mentioned hidden multi-stage limiting support device for externally hung windows, wherein the sliding locking member 7 is provided with a reset end 703 at one end close to the second fixed connecting piece 2. When the window sash and the window frame are in a fully closed state, the distance between the first fixed connecting piece 1 and the second fixed connecting piece 2 is at the minimum distance, the reset end 703 abuts against the support seat 4, the first spring support piece 6 is in a compressed state, the locking limit portion 802 abuts against the top plate, and the first locking structure 701 and the second locking structure 801 are in an unlocked state.

[0018] The above-mentioned hidden multi-stage limiting support device for the external hanging window, wherein, when the locking limiting portion 802 is limited in any one of the limiting grooves 502, the locking limiting portion 802 abuts against the groove wall of the limiting groove 502 close to the second fixed connecting plate 2, and the first locking structure 701 and the second locking structure 801 are in an unlocked state.

[0019] The above-mentioned hidden multi-stage limiting support device for the external hanging window, wherein the first fixed connecting piece 1 is provided with a first limiting structure, and the first limiting structure limits the rotation angle of the telescopic rod 3 around the riveted pin shaft 10 connected thereto, and the second fixed connecting piece 2 is provided with a second limiting structure, and the second limiting structure limits the rotation angle of the support seat 4 around the riveted pin shaft 10 connected thereto.

[0020] Due to the adoption of the above technology, the present invention has the following positive effects compared with the prior art:

[0021] (1) In the present invention, a plurality of limiting grooves are provided on the supporting sleeve, which can realize multi-level limiting of the opening angle between the window sash and the window frame, realize micro ventilation, have low cost, good anti-theft performance, are applicable to most window products, can be assembled on site, are convenient for transportation, are convenient for installation, and are easy to repair, disassemble and replace;

[0022] (2) In the present invention, a plurality of limiting grooves are provided on the support sleeve, which can realize multi-level limiting of the opening angle between the window sash and the window frame. The supporting clamp is limited by the limiting grooves to prevent the window sash from falling back rapidly when the wind is strong, causing the sash glass to shatter;

[0023] (3) The present invention is easy to operate. During the window opening process, when the sliding locking member slides to any limit groove position, the second spring support piece pushes the locking limit portion of the support card into the limit groove, thereby limiting the support card through the limit groove. When the opening angle continues to increase, the first inclined surface and the locking limit portion are smoothly connected, and the limit groove applies a force to the first inclined surface. The second spring support piece is compressed by the force, and the locking limit portion of the support card is pressed against the top plate of the support sleeve until the support card moves to the next limit groove position.

[0024] (4) The present invention is easy to operate. The window closing method is to open the window sash and the window frame to a fully open state. At this time, the first locking structure and the second locking structure are in a locked state, and then the window sash is closed. At this time, during the window closing process, since the first locking structure and the second locking structure are in a locked state, the locking limit part cannot enter the limit groove and the multi-level limit cannot be achieved. When the window sash and the window frame are closed to a fully closed state, the first locking structure and the second locking structure are in an unlocked state, and the multi-level limit function can be achieved again in the next window opening process. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 The present invention is a structural schematic diagram of a hidden multi-stage limiting support device for an externally hung window.

[0026] Figure 2 The figure is a schematic diagram of an embodiment of a hidden multi-stage position-limiting support device for an externally hung window according to the present invention.

[0027] Figure 3 The present invention is a structural schematic diagram of a telescopic rod of a hidden multi-stage position-limiting support device for an externally hung window.

[0028] Figure 4 The present invention is a structural schematic diagram of a sliding locking member of a hidden multi-stage position-limiting support device for an externally hung window.

[0029] Figure 5 The present invention is a structural schematic diagram of a support clamp of a hidden multi-stage position-limiting support device for an externally hung window.

[0030] In the accompanying drawings: 1. First fixed connecting piece; 2. Second fixed connecting piece; 3. Telescopic rod; 4. Support seat; 5. Support sleeve; 6. First spring support piece; 7. Sliding locking piece; 8. Support clamp; 9. Second spring support piece; 10. Riveted pin; 11. Riveted pin; 301. Limiting slot; 302. Second inclined plane; 501. Limiting end; 502. Limiting slot; 701. First locking structure; 702. Sliding limiting part; 703. Reset end; 801. Second locking structure; 802. Locking limiting part; 803. First inclined plane. DETAILED DESCRIPTION

[0031] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, but they are not intended to limit the present invention.

[0032] Please refer to Figures 1 to 5 , a hidden multi-stage limit support device for an externally hung window is shown, which includes:

[0033] A first fixing connecting piece 1 and a second fixing connecting piece 2, wherein the first fixing connecting piece 1 is mounted on the window sash and the second fixing connecting piece 2 is mounted on the window frame;

[0034] The telescopic rod 3, the support base 4 and the support sleeve 5, one end of the support base 4 is rotatably connected to the second fixed connecting piece 2, one end of the support sleeve 5 is connected to the other end of the support base 4, one end of the telescopic rod 3 is arranged in the support sleeve 5 and can be operated to slide along the support sleeve 5, and the other end of the telescopic rod 3 is rotatably connected to the first fixed connecting piece 1;

[0035] The first locking structure 701 and the second locking structure 801 match each other, and the sliding locking member 7 can be operably slid along the support sleeve 5. A limiting sliding groove 301 is provided on the lower side of one end of the telescopic rod 3, and the sliding limiting part 702 is provided in the limiting sliding groove 301 to limit the sliding distance of the sliding locking member 7 in the support sleeve 5. One end of the telescopic rod 3 is rotatably connected to the end of the support clamp 8. A plurality of limiting grooves 502 are provided on the support sleeve 5. Each limiting groove 502 matches the locking limiting part 802, and the telescopic rod 3 located in the support sleeve 5 is limited by the support clamp 8.

[0036] A first spring support piece 6 is installed in the limiting sliding groove 301 , with one end of the first spring support piece 6 resting against the groove wall of the limiting sliding groove 301 and the other end of the first spring support piece 6 resting against the sliding limiting portion 702 ;

[0037] The second spring support piece 9 is arranged between the sliding locking piece 7 and the support clamp 8. One end of the second spring support piece 9 is against the sliding locking piece 7, and the other end of the second spring support piece 9 is against the support clamp 8. The second spring support piece 9 pushes the support clamp 8 to rotate so that the locking limit part 802 is stuck in any one of the limit grooves 502.

[0038] Furthermore, in a preferred embodiment, it also includes: a riveted pin 10, the first fixed connecting piece 1 and the telescopic rod 3 are rotatably connected through a riveted pin 10, and the support seat 4 and the second fixed connecting piece 2 are rotatably connected through another riveted pin 10.

[0039] Furthermore, in a preferred embodiment, it further includes: a rivet pin 11 , and the support seat 4 and the support sleeve 5 are connected by the rivet pin 11 .

[0040] Furthermore, in a preferred embodiment, the first fixing connecting piece 1 and the window sash are connected by screws, and the second fixing connecting piece 2 and the window frame are connected by screws.

[0041] Furthermore, in a preferred embodiment, the support sleeve 5 includes: a top plate, a bottom plate and a side plate, and a slide is formed by the top plate, the bottom plate and the two side plates. One end of the telescopic rod 3 is arranged in the slide and can slide along the slide. A plurality of limit grooves 502 are provided on the top plate, and a locking limit portion 802 is provided on the upper surface of the support clamp 8, and the locking limit portion 802 is against the top plate.

[0042] Furthermore, in a preferred embodiment, the sliding locking member 7 is operably slidable along the upper surface of the base plate, the support clamp 8 is arranged above the sliding locking member 7, the upper surface of the support clamp 8 is provided with a first inclined surface 803 smoothly connected to the locking limit portion 802, and one end of the telescopic rod 3 is provided with a second inclined surface 302. The first inclined surface 803 and the second inclined surface 302 match, and the rotation angle of the support clamp 8 is limited by the second inclined surface 302.

[0043] Furthermore, in a preferred embodiment, a limiting end portion 501 is provided on the lower surface of the top plate near one end of the first fixed connecting piece 1. When the window sash and the window frame are in a fully open state, the distance between the first fixed connecting piece 1 and the second fixed connecting piece 2 is at the maximum distance, the limiting end portion 501 abuts against the first inclined surface 803, the second spring support piece 9 is in a compressed state, the locking limiting portion 802 is separated from the top plate, and the first locking structure 701 and the second locking structure 801 are in a locked state.

[0044] Furthermore, in a preferred embodiment, a reset end portion 703 is provided at one end of the sliding locking member 7 close to the second fixed connecting piece 2. When the window sash and the window frame are in a fully closed state, the distance between the first fixed connecting piece 1 and the second fixed connecting piece 2 is at the minimum distance, the reset end portion 703 abuts against the support seat 4, the first spring support piece 6 is in a compressed state, the locking limit portion 802 abuts against the top plate, and the first locking structure 701 and the second locking structure 801 are in an unlocked state.

[0045] Furthermore, in a preferred embodiment, when the locking limit portion 802 is limited in any one of the limit grooves 502, the locking limit portion 802 rests against the groove wall of the limit groove 502 close to the second fixed connecting plate 2, and the first locking structure 701 and the second locking structure 801 are in an unlocked state.

[0046] Furthermore, in a preferred embodiment, a first limiting structure is provided on the first fixed connecting piece 1, which limits the rotation angle of the telescopic rod 3 around the riveted pin shaft 10 connected thereto, and a second limiting structure is provided on the second fixed connecting piece 2, which limits the rotation angle of the support seat 4 around the riveted pin shaft 10 connected thereto.

[0047] The above are only preferred embodiments of the present invention and are not intended to limit the implementation and protection scope of the present invention.

[0048] The present invention further has the following embodiments based on the above:

[0049] In a further embodiment of the present invention, in order to solve the above-mentioned problem that the window sash is forced to close automatically or even fall back rapidly when the wind is strong, which causes the sash glass to shatter, the present invention provides a specific solution - namely, "a hidden multi-stage limit support device for externally hung windows". The overall length of the device is adjustable, with a stack thickness of 11.5mm. The length can be customized according to different size requirements and different specifications. It is hidden and installed on the two vertical sides between the frame and the sash to avoid the friction hinge. It is generally installed near the lower handle side, so that the hinge is cleared and it is also conducive to supporting the window as a whole. The device cannot be seen after the frame and sash are closed. It is relatively independent of the window hardware and does not interfere with each other. This function can be achieved by installing it in the appropriate position to open the sash. It is made of 304 stainless steel, which is low-cost and rust-proof. It is suitable for both European standard U-slot hardware and C-slot hardware.

[0050] In a further embodiment of the present invention, the device is a sliding multi-stage support mechanism, the main body of which is composed of a fixed connecting piece, a telescopic rod, a support clamp, a support sleeve, a support seat, etc.

[0051] In a further embodiment of the present invention, the fixed connecting piece 2 is installed on the frame through a screw hole, and the fixed connecting piece 1 is installed on the fan body through a screw to avoid collision with the friction hinge. The telescopic rod is connected to the fixed connecting piece 1 through a riveted pin, and the telescopic rod can rotate around the fixed connecting piece 1; one end of the support seat is riveted and fixed to the support sleeve, and the other end is connected to the fixed connecting piece 2 through a riveted pin, and the telescopic rod can rotate around the fixed connecting piece 2. When the fan is opened or closed, the fixed connecting piece 1 on the fan drives the telescopic rod to swing and slide, and the telescopic rod drives the support clip to slide in the support sleeve. The support sleeve has multiple limit slots. During the sliding process of the support clip, it will automatically bounce into the limit slot under the elastic force of the spring support piece 2, forming a support limit. Different ventilation gears can be selected according to different ventilation needs.

[0052] In a further embodiment of the present invention, Figure 2As shown, the right side of the first row is in the sash closed state. When the sash is opened, the support clip will pass through each limit slot in sequence until it reaches the last limit slot on the left side of the first row, forming opening supports at different angles. When closing the window sash, the window sash is pushed upwards from the left side of the first row through the second row to the left side of the third row. After the limit end contacts the support clip, it is forced to rotate around the telescopic arm, pressing the sliding lock to move to the left. At the same time, the sliding lock presses the spring support sheet 1. When the support clip rotates downwards to a certain position, the sliding lock moves to the right under the action of the spring support sheet 1, reaches the left side of the third row, and locks the support clip to form a whole. In the process of closing the window from the left side of the third row to the right side of the third row, when the fan body and the frame are about to be closed tightly, the sliding locking part collides with the support seat, moves to the left, and compresses the spring support piece 1. When it reaches a certain position, the support clamp and the sliding locking part are relatively separated. Under the action of the spring support piece 2, the support clamp bounces upward and reaches the right side position of the first row, forming a cycle.

[0053] In a further embodiment of the present invention, the features include: hidden multi-level limiters to achieve micro-ventilation, low cost, good anti-theft performance, applicable to most window products, on-site installation without affecting product functionality, and more suitable for product after-sales service.

[0054] In a further embodiment of the present invention, during the window opening process, when the sliding locking member slides to any limit groove position, the second spring support piece pushes the locking limit portion of the support clip into the limit groove, so that the support clip is limited by the limit groove. When the opening angle continues to increase, the first inclined surface and the locking limit portion are smoothly connected, the limit groove applies a force to the first inclined surface, the second spring support piece is compressed, and the locking limit portion of the support clip abuts against the top plate of the support sleeve until the support clip moves to the next limit groove position.

[0055] In a further embodiment of the present invention, the window closing method is to open the window sash and the window frame to a fully open state, at which time the first locking structure and the second locking structure are in a locked state, and then close the window sash. At this time, during the window closing process, since the first locking structure and the second locking structure are in a locked state, the locking limit portion cannot enter the limit groove and multi-level limiting cannot be achieved. When the window sash and the window frame are closed to a fully closed state, the first locking structure and the second locking structure are in an unlocked state, and the multi-level limiting function can be achieved again during the next window opening process.

[0056] The above are only preferred embodiments of the present invention and do not limit the implementation mode and protection scope of the present invention. For those skilled in the art, it should be aware that all solutions obtained by equivalent substitutions and obvious changes made using the description and illustrations of the present invention should be included in the protection scope of the present invention.

Claims

1. A hidden multi-stage limit support device for an externally hung window, characterized in that: include: A first fixed connecting piece (1) and a second fixed connecting piece (2), wherein the first fixed connecting piece (1) is mounted on the window sash, and the second fixed connecting piece (2) is mounted on the window frame; A telescopic rod (3), a support base (4) and a support sleeve (5), one end of the support base (4) is rotatably connected to the second fixed connecting piece (2), one end of the support sleeve (5) is connected to the other end of the support base (4), one end of the telescopic rod (3) is arranged in the support sleeve (5) and can be operatively slid along the support sleeve (5), and the other end of the telescopic rod (3) is rotatably connected to the first fixed connecting piece (1); A sliding locking member (7) and a supporting clamp (8), wherein the sliding locking member (7) and the supporting clamp (8) are both arranged in the supporting sleeve (5), the sliding locking member (7) is provided with a first locking structure (701) and a sliding limit portion (702), the supporting clamp (8) is provided with a second locking structure (801) and a locking limit portion (802), the first locking structure (701) and the second locking structure (801) are matched, the sliding locking member (7) is operable to slide along the supporting sleeve (5), and a limit portion is provided on the lower side of one end of the telescopic rod (3) A slide groove (301), the sliding limiting portion (702) is arranged in the limiting slide groove (301), and the sliding distance of the sliding locking member (7) in the support sleeve (5) is limited by the limiting slide groove (301), one end of the telescopic rod (3) and the end of the support clamp (8) are rotatably connected, and a plurality of limiting grooves (502) are provided on the support sleeve (5), each of the limiting grooves (502) matches the locking limiting portion (802), and the telescopic rod (3) located in the support sleeve (5) is limited by the support clamp (8); A first spring support piece (6), the first spring support piece (6) is installed in the limiting sliding groove (301), one end of the first spring support piece (6) abuts against the groove wall of the limiting sliding groove (301), and the other end of the first spring support piece (6) abuts against the sliding limiting portion (702); A second spring support piece (9), the second spring support piece (9) is arranged between the sliding locking piece (7) and the supporting clamp (8), one end of the second spring support piece (9) is against the sliding locking piece (7), and the other end of the second spring support piece (9) is against the supporting clamp (8), and the second spring support piece (9) pushes the supporting clamp (8) to rotate so that the locking limit portion (802) is clamped into any one of the limiting grooves (502).

2. The hidden multi-stage limit support device for an outward-hung window according to claim 1, characterized in that: Also includes: Riveted pins (10), the first fixed connecting piece (1) and the telescopic rod (3) are rotatably connected via one of the riveted pins (10), and the support seat (4) and the second fixed connecting piece (2) are rotatably connected via another of the riveted pins (10).

3. The hidden multi-stage limit support device for an externally hung window according to claim 1, characterized in that: Also includes: A rivet pin (11), wherein the support seat (4) and the support sleeve (5) are connected via the rivet pin (11).

4. The hidden multi-stage limiting support device for an outward-hung window according to claim 1, characterized in that: The first fixed connecting piece (1) and the window sash are connected via screws, and the second fixed connecting piece (2) and the window frame are connected via screws.

5. The hidden multi-stage limiting support device for an outward-hung window according to claim 1, characterized in that: The support sleeve (5) comprises: a top plate, a bottom plate and a side plate, wherein a slideway is formed by the top plate, the bottom plate and the two side plates, one end of the telescopic rod (3) is arranged in the slideway and can be operatively slid along the slideway, a plurality of limiting grooves (502) are provided on the top plate, and a locking limiting portion (802) is provided on the upper surface of the support clamp (8), and the locking limiting portion (802) abuts against the top plate.

6. The hidden multi-stage limit support device for an outward-hung window according to claim 5, characterized in that: The sliding locking member (7) is operable to slide along the upper surface of the base plate, the supporting clamp (8) is arranged above the sliding locking member (7), the upper surface of the supporting clamp (8) is provided with a first inclined surface (803) smoothly connected to the locking limit portion (802), one end of the telescopic rod (3) is provided with a second inclined surface (302), the first inclined surface (803) and the second inclined surface (302) match, and the rotation angle of the supporting clamp (8) is limited by the second inclined surface (302).

7. The hidden multi-stage limiting support device for an outward-hung window according to claim 6, characterized in that: A limiting end portion (501) is provided on the lower surface of the top plate near one end of the first fixed connecting piece (1); when the window sash and the window frame are in a fully open state, the distance between the first fixed connecting piece (1) and the second fixed connecting piece (2) is at a maximum distance, the limiting end portion (501) abuts against the first inclined surface (803), the second spring support piece (9) is in a compressed state, the locking limiting portion (802) and the top plate are separated, and the first locking structure (701) and the second locking structure (801) are in a locked state.

8. The hidden multi-stage limit support device for an outward-hung window according to claim 6, characterized in that: The sliding locking member (7) is provided with a reset end portion (703) at one end close to the second fixed connecting piece (2); when the window sash and the window frame are in a fully closed state, the distance between the first fixed connecting piece (1) and the second fixed connecting piece (2) is at a minimum distance, the reset end portion (703) abuts against the support seat (4), the first spring support piece (6) is in a compressed state, the locking limit portion (802) abuts against the top plate, and the first locking structure (701) and the second locking structure (801) are in an unlocked state.

9. The hidden multi-stage limiting support device for an outward-hung window according to claim 6, characterized in that: When the locking limit portion (802) is limited in any one of the limit grooves (502), the locking limit portion (802) abuts against the groove wall of the limit groove (502) close to the second fixed connecting piece (2), and the first locking structure (701) and the second locking structure (801) are in an unlocked state.

10. The hidden multi-stage limiting support device for an outward-hung window according to claim 2, characterized in that: The first fixed connecting piece (1) is provided with a first limiting structure, and the first limiting structure limits the rotation angle of the telescopic rod (3) around the riveted pin shaft (10) connected thereto, and the second fixed connecting piece (2) is provided with a second limiting structure, and the second limiting structure limits the rotation angle of the support seat (4) around the riveted pin shaft (10) connected thereto.

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