Multi-point lock driver, casement window with multi-point lock driver and lock point driving method

Abstract

The invention relates to the technical field of door and window control, in particular to a multi-point lock driver which comprises a box body, a shifting fork slidably connected with the box body is arranged at the bottom of the box body, a lock pin is arranged on the shifting fork, the interior of the box body is divided into an upper cavity and a lower cavity, and a first kidney-shaped groove and a second kidney-shaped groove which are transversely formed are formed in bottom plates of the upper cavity and the lower cavity respectively. A push plate connected with the chain head is slidably arranged in the upper cavity, a third kidney-shaped groove is obliquely formed in the push plate, the lock pin sequentially penetrates through the first kidney-shaped groove, the second kidney-shaped groove and the third kidney-shaped groove, a limiting block for clamping the lock pin during unlocking and a positioning plate for clamping the lock pin during locking are arranged in the lower cavity, and the part, located outside the box body, of the positioning plate is connected with a window frame. According to the multi-point lock driver, the casement window with the multi-point lock driver and the lock point driving method, high window opening can be met, and the lock point driving requirement can also be met.

Description

Technical Field

[0001] This invention relates to the field of door and window control technology, specifically to a multi-point lock driver, a casement window with the driver, and a locking point driving method. Background Technology

[0002] In existing door and window control systems, chain-type window openers are a common type of drive device, and are mostly suitable for casement windows. Patent CN215632410U discloses a hand-cranked chain window opener, including a window opening linkage component installed on a casement window, a window opening mechanism installed on the window frame (wall), and a hand-cranking mechanism. The window opening mechanism includes a housing, a chain, and a chain drive mechanism. The casement window linkage component is connected to the window opening linkage component. By operating the hand-cranking mechanism, the chain moves in and out of the housing, thereby pushing or pulling the window opening linkage component to open or close the window sash. However, the window sash with this hand-cranked chain window opener lacks a locking structure. In strong winds, the closed window sash can be pulled open, damaging the window opening mechanism. To ensure the reliability of the window sash after it is closed, a multi-point lock needs to be installed. The window opening and closing action is completed by the cooperation of the multi-point lock and the window opener. The locking point drive of the multi-point lock is generally achieved by manual operation of the handle. However, the windows with hand-cranked chain window openers are generally installed at a high position, making it impossible to meet the requirements by installing a handle. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to address the shortcomings of the prior art by providing a multi-point lock driver, a window opening mechanism with the driver, and a locking point driving method. By setting the driver to replace the handle and link it with the window opener, the locking point can be driven while operating the window opener.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a multi-point lock actuator, comprising a housing, wherein a clearance groove is provided at the bottom of the housing, the clearance groove having a locking end and an unlocking end, a fork being movably mounted in the housing through the clearance groove, the fork having a mounting hole, a locking pin being inserted into the mounting hole, the housing being divided into an upper chamber and a lower chamber, the bottom plates of the upper chamber and the lower chamber respectively having a first oblong groove and a second oblong groove arranged horizontally, the axes of the first oblong groove and the second oblong groove coinciding, and a push plate connected to a casement window linkage component being slidably disposed in the upper chamber. The push plate is provided with a third obliquely shaped groove. After the locking pin is connected to the shift fork, it passes through the first oblique groove, the second oblique groove and the third oblique groove. When the push plate moves back and forth in the upper cavity with the extension and retraction of the casement window linkage, the third oblique groove drives the locking pin to move back and forth in the first oblique groove and the second oblique groove. The locking pin drives the shift fork to move back and forth between the locking end and the unlocking end, realizing the locking or unlocking function of the locking point. The lower cavity is provided with a limiting block that locks the locking pin when unlocking and a positioning plate that locks the locking pin when locking. The part of the positioning plate outside the box is connected to the window frame.

[0005] The present invention, possessing the above-mentioned features, achieves the following: by setting a driver to replace the handle and link with the window opener, the locking point can be driven while operating the window opener; by setting the third oblique groove obliquely and the first and second oblique grooves laterally, the force of the push plate moving back and forth is converted into the force of the locking pin moving laterally, thereby driving the fork to move between the locking end and the unlocking end to realize the locking and unlocking functions of the locking point; by setting a limiting block and a positioning plate in the lower cavity, the locking pin is limited in the unlocked state and the locked state respectively, ensuring that the locking pin will not shift, and improving the accuracy and stability of the driver.

[0006] A further feature of the present invention is that: a guide block is provided in the lower cavity, the guide block is located on the side of the second waist-shaped groove, the limiting block is provided with a guide groove adapted to the guide block, and at least one spring for pushing the limiting block is provided on the other side of the limiting block opposite to the guide groove. One end of the spring extending out of the limiting block abuts against the wall of the lower cavity. When locked, the positioning plate abuts against the limiting block. When unlocked, the limiting block disengages from the positioning plate and engages with the locking pin.

[0007] The present invention having the above features: Since the positioning plate is connected to the window frame, as the window sash is opened, the positioning plate leaves the box and no longer abuts against the limiting block. A spring is set to push the limiting block to move until it engages with the locking pin, so as to lock the locking pin when unlocking; a guide block is set to guide and limit the limiting block.

[0008] A further feature of the present invention is that the positioning plate is bent into an L-shape, including a connecting part connected to the window frame and a locking hook part placed in the lower cavity. The locking hook part is provided with an L-shaped locking hook groove, and the locking pin moves in and out of the L-shaped locking hook groove as the window sash is opened and closed.

[0009] The present invention having the above features: in the locked state, the locking pin passes through the first waist-shaped groove, the second waist-shaped groove, the third waist-shaped groove and the L-shaped locking hook groove, and in this state, the positioning plate abuts against the limiting block to achieve positioning of the locking pin; the L-shaped locking hook groove is provided on the positioning plate to facilitate the locking pin disengaging from the positioning plate.

[0010] A further feature of the present invention is that the limiting block includes a limiting block body, and a first wing plate and a second wing plate located on the same side of the side of the limiting block body facing the upper chamber. The first wing plate and the second wing plate are respectively located on both sides of the guide groove, and a locking groove for engaging the locking pin is formed between the first wing plate and the second wing plate. The first wing plate and the second wing plate respectively form a space with the bottom plate of the lower chamber to accommodate the positioning plate.

[0011] The present invention, which has the above-mentioned features, uses a first wing plate and a second wing plate to engage and limit the locking pin. The engagement structure between the two is simple. The first wing plate and the second wing plate are set on the upper side of the limiting block body. When the limiting block moves toward the locking pin, the friction with the bottom of the lower chamber is reduced, and the smoothness of the driver's operation is improved.

[0012] A further feature of the present invention is that the fork is L-shaped and includes a sliding part located at the bottom of the housing and a fork part located outside the housing. The fork part is vertically disposed on one side of the sliding part, and this side is parallel to the moving direction of the fork. The sliding part has two lugs on the other side of the side where the fork part is disposed, and the lugs are disposed at both ends of the side. The bottom of the housing is provided with a groove for accommodating the sliding part. The inner wall of the groove is provided with a protrusion between the two lugs. The groove is covered with a bottom cover, and a clearance groove is provided on the bottom cover for the fork part to pass through.

[0013] The present invention having the above features: the shift fork is linked with the locking pin, and the lugs provided on the shift fork and the protrusions in the sliding groove further limit the shift fork and restrict the sliding stroke of the shift fork.

[0014] A further feature of the present invention is that the box body comprises, from bottom to top, a base, a middle seat, and an end cover, which are detachably connected. The base includes a first mounting plate fixedly connected to the window sash and a first U-shaped surrounding plate disposed on the first mounting plate. The first U-shaped surrounding plate and the end face of the first mounting plate form a lower chamber. The middle seat includes a second mounting plate placed at the end of the first U-shaped surrounding plate and a second U-shaped surrounding plate disposed on the second mounting plate. The second U-shaped surrounding plate and the end face of the second mounting plate form an upper chamber. The end cover is disposed on the middle seat.

[0015] The present invention, which has the above-mentioned features, achieves the division of the upper and lower chambers inside the box by setting a base, a middle seat and an end cover. Such a split setting facilitates the assembly of components.

[0016] In addition, the present invention needs to provide a casement window having the aforementioned multi-point lock driver.

[0017] A casement window includes a window frame and a window sash connected by hinges. A hand-cranked chain window opener is installed on the window frame, and a multi-point lock actuator is installed on the window sash. A lock bar is slidably connected inside the window sash. A fork groove for a fork to pass through is opened in the middle of the lock body. Locking points are provided at both ends of the lock bar. A corresponding lock seat is provided inside the window frame to cooperate with the locking points. One end of the chain of the hand-cranked chain window opener extends out of the opening and is hinged to the casement window linkage. The casement window linkage is connected to a push plate, thereby driving the push plate to move through the chain of the hand-cranked chain window opener.

[0018] A further provision of the present invention is that the locking point driving method of the multi-point lock driver for the casement window is as follows: When locked, the position of the locking pin in the third waist-shaped groove is defined as the highest position, and the position of the locking pin in the first waist-shaped groove and the second waist-shaped groove is defined as the rightmost position. After unlocking, the position of the locking pin in the third waist-shaped groove is defined as the lowest position, and the position of the locking pin in the first waist-shaped groove and the second waist-shaped groove is defined as the leftmost position. When the window sash is opened, the chain of the hand-cranked chain window opener extends, and the chain drives the push plate to move towards the upper inner wall of the cavity through the casement window linkage. At the same time, the locking pin is pushed from the highest position to the lowest position of the third waist-shaped groove, and moves from the rightmost position of the first waist-shaped groove and the second waist-shaped groove to the leftmost position, disengaging from the L-shaped locking hook groove of the positioning plate. This causes the fork to slide along the locking end of the clearance groove to the unlocking end, realizing the locking point unlocking. As the window sash leaves the window frame, the positioning plate also leaves the lower cavity. The limiting block is pushed by the spring towards the casement window linkage and locks the locking pin, thus unlocking the locking point. As the chain of the hand-cranked chain window opener extends, the window sash opens. When the window sash is closed, the chain of the hand-cranked chain window opener is retracted. The chain drives the push plate to move away from the upper chamber wall through the casement window linkage. The locking pin is pushed from the lowest position of the third waist-shaped groove to the highest position. At the same time, the limiting plate is inserted into the lower chamber and pushes the limiting block. The locking pin disengages from the limiting block and enters the L-shaped locking hook groove of the positioning plate. The locking pin moves from the leftmost position of the first waist-shaped groove and the second waist-shaped groove to the rightmost position, causing the fork to slide along the unlocking end of the clearance groove to the locking end, realizing the locking point. When the locking pin is placed at the rightmost position of the L-shaped locking hook groove of the positioning plate, the locking point is locked in place.

[0019] The present invention, which has the above-mentioned features, uses a driver instead of a handle to link with the window opener, so that the locking point can be driven while operating the window opener, making it convenient to use and improving the airtightness and safety of the window sash.

[0020] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the casement window structure according to an embodiment of the present invention. Figure 1 .

[0022] Figure 2 This is a schematic diagram of the casement window structure according to an embodiment of the present invention. Figure 2 .

[0023] Figure 3 This is a schematic diagram of the structure of the multi-point lock driver according to an embodiment of the present invention. Figure 1 .

[0024] Figure 4 This is an exploded view of the multi-point lock driver according to an embodiment of the present invention.

[0025] Figure 5 This is a schematic diagram of the multi-point lock driver without the bottom cover according to an embodiment of the present invention.

[0026] Figure 6 This is a schematic diagram of the structure of the multi-point lock driver according to an embodiment of the present invention. Figure 2 .

[0027] Figure 7 This is a schematic diagram of the structure of the limiting block in an embodiment of the present invention.

[0028] Figure 8 This is a schematic diagram of the upper chamber in the locked state according to an embodiment of the present invention.

[0029] Figure 9 This is a schematic diagram of the lower chamber in the locked state according to an embodiment of the present invention.

[0030] Figure 10 This is a schematic diagram of the upper chamber structure in the unlocked state according to an embodiment of the present invention.

[0031] Figure 11 This is a schematic diagram of the lower chamber in the unlocked state according to an embodiment of the present invention. Detailed Implementation

[0032] This specific embodiment is merely an explanation of the present invention and is not intended to limit the invention. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they are within the scope of the claims of the present invention.

[0033] like Figure 1-2The casement window shown includes a window frame 8 and a window sash 9 connected by hinges. A hand-cranked chain window opener 10 is installed on the window frame 8, and a multi-point lock actuator is installed on the window sash 9. A lock bar 11 is slidably connected inside the window sash 9. A fork groove 111 for a fork 3 to pass through is opened in the middle of the lock bar 11. Locking points 12 are provided at both ends of the lock bar 11. A corresponding lock seat 13 that cooperates with the locking points 12 is provided inside the window frame 8. One end of the chain 101 of the hand-cranked chain window opener 10 is hinged to a casement window linkage component 102. The casement window linkage component 102 is connected to a push plate 4, so that the push plate 4 is moved by the chain 101 of the hand-cranked chain window opener 10.

[0034] like Figure 3-11 The multi-point lock actuator for chain window openers shown includes a housing 2. A recessed groove 261 is provided at the bottom of the housing 2, with a locking end and an unlocking end. A fork 3 is movably mounted inside the housing 2 via the recessed groove 261. The fork 3 has a mounting hole 33 into which a locking pin 1 is inserted. The housing 2 is divided into an upper chamber 21 and a lower chamber 22. The bottom plates of the upper chamber 21 and the lower chamber 22 are respectively provided with a first oblong groove 211 and a second oblong groove 221 arranged laterally. A push plate 4, connected to the chain head (i.e., the casement window linkage in document CN215632410U), is slidably mounted inside the upper chamber 21. The push plate 4 is provided with a third obliquely arranged waist-shaped groove 41. The locking pin 1 passes through the first waist-shaped groove 211, the second waist-shaped groove 221, and the third waist-shaped groove 41 in sequence. When the push plate 4 moves back and forth in the upper chamber 21 with the extension and retraction of the chain head, the third waist-shaped groove 41 drives the locking pin 1 to move back and forth in the first waist-shaped groove 211 and the second waist-shaped groove 221. The locking pin 1 drives the shift fork 3 to move back and forth between the locking end and the unlocking end, realizing the locking or unlocking function of the locking point. The lower chamber 22 is provided with a limiting block 5 that locks the locking pin 1 when unlocking and a positioning plate 6 that locks the locking pin 1 when locking. The part of the positioning plate 6 located outside the box 2 is connected to the window frame 8.

[0035] A guide block 222 is provided inside the lower chamber 22. The guide block 222 is located on the side of the second waist-shaped groove 221. The limiting block 5 is provided with a guide groove 51 that matches the guide block 222. On the other side of the limiting block 5 opposite to the guide groove 51, there is at least one spring 7 that pushes the limiting block 5. One end of the spring 7 extending out of the limiting block 5 abuts against the chamber wall of the lower chamber 22. When locked, the positioning plate 6 abuts against the limiting block 5. When unlocked, the limiting block 5 disengages from the positioning plate 6 and... The locking pin 1 is engaged, and the limiting block 5 includes a limiting block body 52. ​​On the side of the limiting block body 52 facing the upper chamber 21, there are a first wing plate 53 and a second wing plate 54 located on the same side. The first wing plate 53 and the second wing plate 54 are respectively located on both sides of the guide groove 51. A slot 55 for engaging the locking pin 1 is formed between the first wing plate 53 and the second wing plate 54. The first wing plate 53 and the second wing plate 54 respectively form a space with the bottom plate of the lower chamber 22 to accommodate the positioning plate 6.

[0036] The positioning plate 6 is bent into an L-shape and includes a connecting part 61 connected to the window frame 8 and a locking hook part 62 placed in the lower cavity 22. The locking hook part 62 is provided with an L-shaped locking hook groove 621, and the locking pin 1 moves in and out of the L-shaped locking hook groove 621 as the window sash 9 is opened and closed.

[0037] The box body 2 includes, from bottom to top, a base 23, a middle seat 24, and an end cap 25, which are detachably connected. The base 23 includes a first mounting plate 231 fixedly connected to the window sash 9 and a first U-shaped surrounding plate 232 disposed on the first mounting plate 231. The first U-shaped surrounding plate 232 and the end face of the first mounting plate 231 form a lower chamber 22. The middle seat 24 includes a second mounting plate 241 placed at the end of the first U-shaped surrounding plate 232 and a second U-shaped surrounding plate 242 disposed on the second mounting plate 241. The second U-shaped surrounding plate 242 and the end face of the second mounting plate 241 form an upper chamber 21. The end cap 25 is placed on the middle seat 24.

[0038] The shift fork 3 is L-shaped and includes a sliding part 31 located at the bottom of the housing 2 and a shift fork part 32 located outside the housing 2. The shift fork part 32 is vertically arranged on one side of the sliding part 31, which is parallel to the moving direction of the shift fork 3. The sliding part 31 has two lugs 311 on the other side of the shift fork part 32. The lugs 311 are located at both ends of the side. The bottom of the base 23 has a groove 233 for accommodating the sliding part 31. The inner wall of the groove 233 has a protrusion 2331 located between the two lugs 311. The groove 233 is covered with a bottom cover 26, and the bottom cover 26 has a clearance groove 261 for the shift fork part 32 to pass through.

[0039] The locking point driving method of a multi-point lock driver is as follows: When locked, the position of the locking pin in the third waist-shaped groove is defined as the highest position, and the position of the locking pin in the first waist-shaped groove and the second waist-shaped groove is defined as the rightmost position. After unlocking, the position of the locking pin in the third waist-shaped groove is defined as the lowest position, and the position of the locking pin in the first waist-shaped groove and the second waist-shaped groove is defined as the leftmost position. When the window sash is opened, the chain of the hand-cranked chain window opener extends, and the chain drives the push plate to move towards the upper inner wall of the cavity through the casement window linkage. At the same time, the locking pin is pushed from the highest position to the lowest position of the third waist-shaped groove, and moves from the rightmost position of the first waist-shaped groove and the second waist-shaped groove to the leftmost position, disengaging from the L-shaped locking hook groove of the positioning plate. This causes the fork to slide along the locking end of the clearance groove to the unlocking end, realizing the locking point unlocking. As the window sash leaves the window frame, the positioning plate also leaves the lower cavity. The limiting block is pushed by the spring towards the casement window linkage and locks the locking pin, thus unlocking the locking point. As the chain of the hand-cranked chain window opener extends, the window sash opens. When the window sash is closed, the chain of the hand-cranked chain window opener is retracted. The chain drives the push plate to move away from the upper chamber wall through the casement window linkage. The locking pin is pushed from the lowest position of the third waist-shaped groove to the highest position. At the same time, the limiting plate is inserted into the lower chamber and pushes the limiting block. The locking pin disengages from the limiting block and enters the L-shaped locking hook groove of the positioning plate. The locking pin moves from the leftmost position of the first waist-shaped groove and the second waist-shaped groove to the rightmost position, causing the fork to slide along the unlocking end of the clearance groove to the locking end, realizing the locking point. When the locking pin is placed at the rightmost position of the L-shaped locking hook groove of the positioning plate, the locking point is locked in place.

Claims

1. A multi-point lock driver, characterized in that: The box includes a housing with a recessed groove at its bottom. The recessed groove has a locking end and an unlocking end. A fork is movably mounted inside the housing via the recessed groove. The fork has a mounting hole into which a locking pin is inserted. The housing is divided into an upper chamber and a lower chamber. The bottom plates of the upper and lower chambers are respectively provided with a first oblong groove and a second oblong groove arranged horizontally. The axes of the first oblong groove and the second oblong groove coincide. A push plate connected to a casement window linkage is slidably mounted inside the upper chamber. The push plate has a 45-degree inclined... The third waist-shaped groove is provided. After the locking pin is connected to the shift fork, it passes through the first waist-shaped groove, the second waist-shaped groove, and the third waist-shaped groove. When the push plate moves back and forth in the upper cavity as the casement window linkage extends and retracts, the third waist-shaped groove drives the locking pin to move back and forth in the first waist-shaped groove and the second waist-shaped groove. The locking pin drives the shift fork to move back and forth between the locking end and the unlocking end, realizing the locking or unlocking function of the locking point. The lower cavity is provided with a limiting block that locks the locking pin when unlocking and a positioning plate that locks the locking pin when locking. The part of the positioning plate located outside the box is connected to the window frame.

2. The multi-point lock driver according to claim 1, characterized in that: The lower chamber is provided with a guide block located on the side of the second waist-shaped groove. The limiting block is provided with a guide groove that matches the guide block. On the other side of the limiting block opposite to the guide groove, there is at least one spring that pushes the limiting block. One end of the spring extending out of the limiting block abuts against the chamber wall of the lower chamber. When locked, the positioning plate abuts against the limiting block. When unlocked, the limiting block disengages from the positioning plate and engages with the locking pin.

3. A multi-point lock driver according to claim 1, characterized in that: The positioning plate is bent into an L-shape and includes a connecting part that connects to the window frame and a locking hook part placed in the lower cavity. The locking hook part is provided with an L-shaped locking hook groove, and the locking pin moves in and out of the L-shaped locking hook groove as the window sash is opened and closed.

4. A multi-point lock driver according to claim 2, characterized in that: The limiting block includes a limiting block body. On the side of the limiting block body facing the upper chamber, there are a first wing plate and a second wing plate located on the same side. The first wing plate and the second wing plate are respectively located on both sides of the guide groove. A locking groove for a locking pin is formed between the first wing plate and the second wing plate. The first wing plate and the second wing plate respectively form a space with the bottom plate of the lower chamber to accommodate the positioning plate.

5. A multi-point lock driver according to claim 1, characterized in that: The shift fork is L-shaped and includes a sliding part located at the bottom of the housing and a shift fork part located outside the housing. The shift fork part is vertically disposed on one side of the sliding part, and this side is parallel to the moving direction of the shift fork. The sliding part has two lugs on the other side of the side where the shift fork part is disposed, and the lugs are disposed at both ends of the side. The bottom of the housing has a groove for accommodating the sliding part. The inner wall of the groove has a protrusion placed between the two lugs. The groove is covered with a bottom cover, and a clearance groove is disposed on the bottom cover for the shift fork part to pass through.

6. A multi-point lock driver according to claim 1, characterized in that: The box body comprises, from bottom to top, a base, a middle seat, and an end cover, which are detachably connected. The base includes a first mounting plate fixedly connected to the window sash and a first U-shaped enclosure plate disposed on the first mounting plate. The first U-shaped enclosure plate and the end face of the first mounting plate form a lower chamber. The middle seat includes a second mounting plate placed at the end of the first U-shaped enclosure plate and a second U-shaped enclosure plate disposed on the second mounting plate. The second U-shaped enclosure plate and the end face of the second mounting plate form an upper chamber. The end cover is disposed on the middle seat.

7. A casement window, comprising a window frame and a window sash connected by hinges, wherein a hand-cranked chain window opener is installed on the window frame, characterized in that: It also includes the multi-point lock actuator as described in any one of claims 1 to 6, wherein the multi-point lock actuator is installed on the window sash, a lock bar is slidably connected inside the window sash, a fork groove for a fork to pass through is provided in the middle of the lock bar, locking points are provided at both ends of the lock bar, and a corresponding lock seat is provided inside the window frame to cooperate with the locking points. One end of the chain of the hand-cranked chain window opener extends out to connect to the hinged casement window linkage, and the casement window linkage is connected to the push plate, thereby driving the push plate to move through the chain of the hand-cranked chain window opener.

8. A locking point driving method for a multi-point lock driver for a casement window as described in claim 7, as follows: When locked, the position of the locking pin in the third waist-shaped groove is defined as the highest position, and the position of the locking pin in the first waist-shaped groove and the second waist-shaped groove is defined as the rightmost position. After unlocking, the position of the locking pin in the third waist-shaped groove is defined as the lowest position, and the position of the locking pin in the first waist-shaped groove and the second waist-shaped groove is defined as the leftmost position. When the window sash is opened, the chain of the hand-cranked chain window opener extends, and the chain drives the push plate to move towards the upper inner wall of the cavity through the casement window linkage. At the same time, the locking pin is pushed from the highest position to the lowest position of the third waist-shaped groove, and moves from the rightmost position of the first waist-shaped groove and the second waist-shaped groove to the leftmost position, disengaging from the L-shaped locking hook groove of the positioning plate. This causes the fork to slide along the locking end of the clearance groove to the unlocking end, realizing the locking point unlocking. As the window sash leaves the window frame, the positioning plate also leaves the lower cavity. The limiting block is pushed by the spring towards the casement window linkage and locks the locking pin, thus unlocking the locking point. As the chain of the hand-cranked chain window opener extends, the window sash opens. When the window sash is closed, the chain of the hand-cranked chain window opener is retracted. The chain drives the push plate to move away from the upper chamber wall through the casement window linkage. The locking pin is pushed from the lowest position of the third waist-shaped groove to the highest position. At the same time, the limiting plate is inserted into the lower chamber and pushes the limiting block. The locking pin disengages from the limiting block and enters the L-shaped locking hook groove of the positioning plate. The locking pin moves from the leftmost position of the first waist-shaped groove and the second waist-shaped groove to the rightmost position, causing the fork to slide along the unlocking end of the clearance groove to the locking end, realizing the locking point. When the locking pin is placed at the rightmost position of the L-shaped locking hook groove of the positioning plate, the locking point is locked in place.

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