Double-chain window lock

Abstract

A double-chain window lock is provided with a middle plate, a driving gear and a driving turbine driving the driving gear to rotate are arranged in the middle of the front face of the middle plate, and a left gear, a left turbine driving the left gear, a right gear and a right turbine driving the right gear are arranged at the two ends of the front face of the middle plate respectively. The driving gear is in transmission connection with the left turbine and the right turbine through a left turbine transmission shaft and a right turbine transmission shaft respectively; the left gear and the right gear are respectively arranged in positioning holes formed in the middle plate; one ends of the left gear and the right gear on the back surface of the middle plate are respectively connected with a chain rotating gear; chain guide grooves are formed in the two ends of the back face of the middle plate respectively, a left chain and a right chain are arranged in the chain guide grooves respectively, and the left chain and the right chain are meshed with chain rotating gears arranged on the left gear and the right gear respectively; the gear tooth gap between the driving gear and the driving turbine is larger than or smaller than the gear tooth gap between the left gear and the left turbine and the gear tooth gap between the right gear and the right turbine. And heavy windows can be adapted.

Description

Technical Field

[0001] The utility model relates to the technical field of window locks. Background Art

[0002] Chain window locks are widely used to provide security while maintaining indoor ventilation. Existing chain window locks typically feature a single chain design. However, with the increasing demand for energy conservation and environmental protection, double-glazed windows, which are often heavy, have become increasingly popular. Existing single-chain window locks are unable to effectively support these heavy windows and suffer from insufficient bearing capacity. Therefore, there is an urgent need to develop a double-chain lock that can accommodate heavy windows. Utility Model Content

[0003] In view of the above situation, in order to solve the problems existing in the above technology, the utility model proposes a double-chain window lock that can adapt to heavy windows.

[0004] A double-chain window lock is provided with a middle plate, a driving gear and a driving turbine for driving the driving gear to rotate are provided in the middle of the front side of the middle plate, a left gear and a left turbine driving it and a right gear and a right turbine driving it are provided at both ends of the front side of the middle plate respectively, the driving gear is connected to the left turbine and the right turbine respectively through the left turbine transmission shaft and the right turbine transmission shaft; the left gear and the right gear are respectively arranged in the positioning holes provided in the middle plate, and the left gear and the right gear are respectively connected to the chain rotating gear at one end of the back side of the middle plate; chain guide grooves are respectively provided at both ends of the back side of the middle plate, and the left chain and the right chain are respectively provided in the chain guide grooves, and the left chain and the right chain are respectively meshed with the chain rotating gears provided on the left gear and the right gear.

[0005] According to a double-chain window lock of the present application, a lock head is also provided on the middle plate, and a chain locking link is connected to the lock head and is driven by the lock head to move in a locking slide groove provided on the middle plate, and the end of the chain locking link can be detachably inserted into the tooth groove on the chain rotating gear.

[0006] The lock head is provided with an eccentric shaft that rotates as the lock head inner core rotates, and one end of the chain locking link is provided with a driving groove that enables the chain locking link to move as the eccentric shaft rotates, and the eccentric shaft is installed in the driving groove.

[0007] The chain locking link includes a connecting portion and a locking portion, the connecting portion is connected to the eccentric shaft, one end of the locking portion is connected to the connecting portion, and the other end of the locking portion is provided with a locking plate, and the locking plate can be detachably inserted into the tooth groove on the chain rotating gear.

[0008] According to a double-chain window lock of the present application, a visual switch is also connected to the connecting part, and the visual switch is provided with at least two indication areas with different markings; the front of the middle plate is also provided with a face cover, and the face cover is provided with a through hole, and a switch indication window made of a transparent material is provided in the through hole. When the visual switch moves with the chain locking link, at least one indication area is located behind the switch indication window.

[0009] According to a double-chain window lock of the present application, the chain guide groove includes an upper guide groove and a lower guide groove, the upper guide groove and the lower guide groove are connected by an arc guide groove near the middle of the middle plate, and the lower guide groove is provided with an exit arc groove at the end near the middle plate, and the exit arc groove is connected with the external space; the left chain and the right chain are respectively arranged in the lower guide groove, and the left chain and the right chain are respectively provided with a chain head end and a chain tail end, the chain head end extends to the outside of the middle plate through the exit arc groove, and the chain tail end passes through the arc guide groove to the upper guide groove.

[0010] A deep guide groove is further provided on the top of the upper guide groove, and a limiting column is further provided on the tail end of the chain, and the limiting column is installed in the deep guide groove.

[0011] The top of the middle plate is provided with safety locks on both sides of the driving gear. The safety lock is provided with a limiting hole that penetrates into the guide deep groove. A safety latch shaft is fixed in the limiting hole to prevent the tail end of the chain from falling out of the upper guide groove. The tail end of the safety latch shaft extends into the guide deep groove and is located between the limiting column and the arc guide groove.

[0012] According to a double-chain window lock of the present application, a handle is connected to the driving turbine and can drive the driving turbine to rotate. The handle includes a rotating arm and a handle rod connected to the rotating arm in a relatively foldable manner.

[0013] According to a double-chain window lock of the present application, a gear box fixing seat is provided on the side of the middle plate where the driving turbine is located, a gear box is installed on the gear box fixing seat, and a driving motor is connected to the gear box.

[0014] After adopting the technology proposed by the present invention, the double-chain window lock according to the embodiment of the present invention has the following beneficial effects.

[0015] 1) Through the cooperation of the middle plate and other components, a compact, strong and reliable double-chain window lock structure is formed, which can adapt to heavy windows and significantly improve the efficiency and comfort of user operation.

[0016] 2) The coordinated structure of the center plate, left turbine gear system, intermediate drive turbine gear assembly, right turbine gear system, and left and right chains ensures bilateral symmetry in overall force distribution. Both the front and back of the center plate contain force-bearing and motion structures, fully utilizing space while also balancing force distribution for smoother and more reliable product operation. The combination of the three transmission systems, including the turbine and gears, achieves excellent self-locking performance, a high transmission ratio, a compact structure, smooth operation, low noise, and a high load capacity.

[0017] 3) The chain locking link and associated components enable more convenient and effective chain locking, while also providing reliable and convenient indication of the locking status. Furthermore, the dual-chain design allows for effective chain self-locking by adjusting the turbine's transmission ratio and clearance.

[0018] 4) The special structural setting of the chain guide groove makes full use of the space and shortens the product length. The setting of multiple groove structures makes the middle plate a porous three-dimensional plate structure with several reinforcing ribs while meeting the performance requirements. It has a lighter weight and a stronger load-bearing capacity.

[0019] 5) The integrated aluminum alloy shell can be customized in different colors according to customer needs. It can be made in the same color as the customer's windows, which is more beautiful.

[0020] 6) The special turbine gear design can be produced using traditional die-casting equipment, which can increase efficiency and reduce costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a front structural diagram of a double-chain window lock according to the present application;

[0022] Figure 2 for Figure 1 The structure diagram of the double chain window lock with the cover removed;

[0023] Figure 3 for Figure 1 The structure diagram of the double-chain window lock after removing the front cover, middle cover and left and right gear covers;

[0024] Figure 4 for Figure 3 The back structure diagram of the double chain window lock after removing the back plate;

[0025] Figure 5 for Figure 4 Magnified view of part C;

[0026] Figure 6 for Figure 4 A magnified view of the structure at the middle safety lock;

[0027] Figure 7 This is a structural diagram of a double-chain window lock transmission system according to the present application;

[0028] Figure 8 This is a structural diagram of the back of the lock head of a double-chain window lock according to the present application.

[0029] In the figure,

[0030] Medium board 1

[0031] Locking groove 106

[0032] Cover 11

[0033] Middle cover 12

[0034] Left gear cover 13

[0035] Right gear cover 14

[0036] Back panel 15

[0037] Chain rotation gear 20

[0038] Drive gear 21

[0039] Drive turbine 22

[0040] Handle 23

[0041] Rotating arm 231

[0042] Handlebar 232

[0043] Left gear 31

[0044] Left turbine 32

[0045] Left turbine drive shaft 33

[0046] Right gear 41

[0047] Right turbine 42

[0048] Right turbine drive shaft 43

[0049] Chain guide groove 5

[0050] Upper guide groove 501

[0051] Guide deep groove 5011

[0052] Lower guide groove 502

[0053] Arc guide groove 503

[0054] Exit arc groove 504

[0055] Left chain 51

[0056] Right chain 52

[0057] Chain head end 53

[0058] Chain end 54

[0059] Limit column 541

[0060] Safety lock 59

[0061] Limit hole 591

[0062] Lock 6

[0063] Eccentric shaft 61

[0064] Visual switch 62

[0065] Switch indicator window 621

[0066] Chain lock link 69

[0067] Drive slot 690

[0068] Connecting part 691

[0069] Locking portion 692

[0070] Locking plate 693 DETAILED DESCRIPTION

[0071] Various preferred embodiments of the present invention will be described below with reference to the accompanying drawings. The following description with reference to the accompanying drawings is provided to facilitate understanding of the exemplary embodiments of the present invention as defined by the claims and their equivalents. It includes various specific details to aid understanding, but they are to be considered as illustrative only. Therefore, those skilled in the art will recognize that various changes and modifications may be made to the embodiments described herein without departing from the scope and spirit of the present invention. Moreover, for the sake of clarity and brevity, detailed descriptions of functions and structures well known in the art will be omitted.

[0072] like Figure 1-8As shown, a double-chain window lock is provided with a middle plate 1, and a driving gear 21 and a driving turbine 22 for driving the driving gear 21 to rotate are provided in the middle part of the front side of the middle plate 1, and a left gear 31 and a left turbine 32 driving it and a right gear 41 and a right turbine 42 driving it are respectively provided at two ends of the front side of the middle plate 1, and the driving gear 21 is respectively connected to the left turbine 32 and the right turbine 42 through a left turbine transmission shaft 33 and a right turbine transmission shaft 43; the left gear 31 and the right gear 41 are respectively arranged in the positioning holes provided on the middle plate 1, and the left gear 31 and the right gear 41 are respectively connected to the chain rotating gear 20 at one end of the back side of the middle plate 1; chain guide grooves 5 are respectively provided at two ends of the back side of the middle plate 1, and a left chain 51 and a right chain 52 are respectively provided in the chain guide grooves 5, and the left chain 51 and the right chain 52 are respectively meshed with the chain rotating gear 20 provided on the left gear 31 and the right gear 41.

[0073] The driving relationship between the driving gear 21 and the driving turbine 22 that drives the driving gear 21 to rotate, the left gear 31 and the left turbine 32 that drives it, and the right gear 41 and the right turbine 42 that drives it is achieved through conventional gear meshing transmission.

[0074] The drive gear 21 is connected to the left turbine 32 and the right turbine 42 via the left turbine drive shaft 33 and the right turbine drive shaft 43, respectively. More specifically, the left side of the drive gear 21 connecting shaft is the left turbine drive shaft 33 and the right turbine drive shaft 43 is on the right side, connected as a whole. The left turbine 32 engages the left gear 31, and the right turbine 42 engages the right gear 41, forming a transmission connection. The transmission connection between the drive gear 21, the left turbine drive shaft 33, the left turbine 32, the right turbine drive shaft 43, and the right turbine 42 is a rigid connection and is an integral whole. The gears rotate, and the turbines rotate. The left side transmits the left, and the right side transmits the right.

[0075] The middle plate 1 is further provided with a lock head 6, to which a chain locking link 69 is connected and driven by the lock head 6 to move in a locking slot 106 provided on the middle plate 1. The end of the chain locking link 69 is detachably inserted into a tooth groove on the chain rotating gear 20. When the chain locking link 69 is locked, the link can jump due to spring compression when the chain is retracted in the forward direction, and cannot rotate due to the ratchet structure of the locking slot 106 when the chain is withdrawn in the reverse direction.

[0076] The lock head 6 is provided with an eccentric shaft 61 that rotates as the lock head inner core rotates. One end of the chain locking link 69 is provided with a driving groove 690 that allows the chain locking link 69 to move as the eccentric shaft 61 rotates. The eccentric shaft 61 is installed in the driving groove 690.

[0077] The chain locking link 69 includes a connecting portion 691 and a locking portion 692, wherein the connecting portion 691 is connected to the eccentric shaft 61, one end of the locking portion 692 is connected to the connecting portion 691, and the other end of the locking portion 692 is provided with a locking plate 693, and the locking plate 693 can be detachably inserted into the tooth groove on the chain rotating gear 20.

[0078] A visual switch 62 is also connected to the connecting portion 691, and the visual switch 62 is provided with at least two indication areas with different markings; the front of the middle plate 1 is also provided with a face cover 11, and the face cover 11 is provided with a through hole, and a switch indication window 621 made of a transparent material is provided in the through hole. When the visual switch 62 moves with the chain locking link 69, at least one indication area is located behind the switch indication window 621.

[0079] The chain guide groove 5 includes an upper guide groove 501 and a lower guide groove 502, and the upper guide groove 501 and the lower guide groove 502 are connected by an arc guide groove 503 near the middle of the middle plate 1, and the lower guide groove 502 is provided with an outlet arc groove 504 at the end near the middle plate 1, and the outlet arc groove 504 is connected to the external space; the left chain 51 and the right chain 52 are respectively arranged in the lower guide groove 502, and the left chain 51 and the right chain 52 are respectively provided with a chain head end 53 and a chain tail end 54, and the chain head end 53 extends to the outside of the middle plate 1 through the outlet arc groove 504, and the chain tail end 54 passes through the arc guide groove 503 to the upper guide groove 501.

[0080] A guide deep groove 5011 is further provided on the top of the upper guide groove 501, and a limiting post 541 is further provided on the chain tail end 54. The limiting post 541 is installed in the guide deep groove 5011. The chain tail end 54 stops moving at the end of the guide groove.

[0081] A safety lock 59 is provided on either side of the drive gear 21 at the top of the middle plate 1. The safety lock 59 has a limiting hole 591 extending through the deep guide groove 5011. A safety latch shaft is fixed in the limiting hole 591 to prevent the chain tail 54 from escaping from the upper guide groove 501. The tail end of the safety latch shaft extends into the deep guide groove 5011 and is located between the limiting post 541 and the arcuate guide groove 503. For safety reasons, the user can set the chain extension length to, for example, 100 mm or 105 mm to prevent the window from being fully opened.

[0082] Attached to the drive turbine 22 is a handle 23 that drives the drive turbine 22 in rotation. The handle 23 comprises a rotating arm 231 and a handle rod 232 that is foldably connected to the rotating arm 231. By rotating the central turbine handle, two chains can be simultaneously connected to support the window. Alternatively, a gearbox mounting bracket is provided on the side of the middle plate 1 where the drive turbine 22 is located. A gearbox is mounted on the mounting bracket, and a drive motor is connected to the gearbox.

[0083] The middle plate 1 is provided with a middle cover 12 at the drive gear 21 and the drive turbine 22, which covers the drive gear 21 and the drive turbine 22; a left gear cover 13 is provided at the left gear 31 and the left turbine 32, which covers the left gear 31 and the left turbine 32; and a right gear cover 14 is provided at the right gear 41 and the right turbine 42, which covers the right gear 41 and the right turbine 42.

[0084] The front of the middle plate 1 is also provided with a face cover 11, and the middle cover 12, the left gear cover 13, and the right gear cover 14 are located inside the face cover 11. The back of the middle plate 1 is also provided with a back plate 15, and the left chain 51 and the right chain 52 are arranged on the inner side of the back plate 15. The chain head ends 53 of the left chain 51 and the right chain 52 extend to the outside of the middle plate 1 through the hole opened at the top of the middle plate 1.

[0085] According to a double-chain window lock of the present application, the two shaft ends of the driving gear 21, driving turbine 22, left gear 31, left turbine 32, right gear 41 and right turbine 42 are respectively mounted in mounting holes set on the middle plate 1, the face cover 11, the middle cover 12, the left gear cover 13, the right gear cover 14 or the back plate 15 through bearing mechanisms such as sliding bearing structures or rolling bearing structures. The mounting holes can be set on a certain plate or composed of a combination of structural features on multiple plates. They can be set according to the existing positioning technology of gear shafts and turbine shafts, as long as the structure and relative position relationship described in the present application can be achieved.

[0086] According to a double-chain window lock of the present application, the driving turbine 22 is connected to a handle 23 or a driving motor that can drive the driving turbine 22 to rotate, or both are provided at the same time, forming a double-chain manual-automatic window lock.

[0087] The design of the visual switch 62 is that the switch indicator is fixed on the chain locking rod, and the indicator area can be set to two colors, for example, red and green. When the lock head is rotated counterclockwise, the switch displays green. When it is rotated clockwise, the rod is moved by the pressure of the retaining spring, and the window displays a red indicator to indicate the locked state.

[0088] According to the double-chain window lock of the present application, the tooth clearance between the drive gear 21 and the drive turbine 22 is greater or less than the tooth clearance between the left gear 31 and the left turbine 32, and the tooth clearance between the right gear 41 and the right turbine 42. The present application adopts a two-stage turbine + helical gear transmission, and the clearance of the active turbine is different from that of the second-stage turbine, which improves self-locking.

[0089] According to a double-chain window lock of the present application, a handle 23 or a drive motor is connected to the drive turbine 22 to drive the drive turbine 22 to rotate. The handle 23 includes a rotating arm 231 and a handle rod 232 that is relatively foldably connected to the rotating arm 231. The handle rod can be bent and then embedded in the rotating arm.

[0090] Alternatively, a gearbox fixing seat is provided on the side of the middle plate 1 where the drive turbine 22 is located, and a gearbox is mounted on the gearbox fixing seat, and a drive motor is connected to the gearbox. By adding a gearbox fixing seat on the side, a gearbox can be installed to turn it into an electric double chain window lock.

[0091] According to the double-chain window lock of the present invention, a special transmission ratio of the turbine size can be used to allow the chain to rotate one circle and release one chain link at a moderate speed.

[0092] According to the double-chain window lock of the present application, a safety latch shaft, or safety rod, is fixedly mounted in the stop hole 591 to prevent the chain tail end 54 from escaping from the upper guide groove 501. The tail end of the safety latch shaft extends into the deep guide groove 5011 and is located between the stop post 541 and the arcuate guide groove 503. The safety latch shaft is dimensioned so that, after installation, the chain stops after 100 mm of extension, ensuring a stable window opening angle and providing safety protection.

[0093] A double-chain window lock according to the present application adopts a turbine gear transmission structure including a left turbine gear system, an intermediate drive turbine gear assembly, and a right turbine gear system, and has the following main advantages:

[0094] Self-locking: The worm gear transmission has a self-locking function, that is, when the worm drives the worm wheel, the worm wheel cannot drive the worm in the opposite direction. This structure can fully prevent reverse movement.

[0095] Large transmission ratio: Turbine gear transmission can achieve a large transmission ratio, which can reach 1:100 or even higher, which is suitable for occasions such as window locks that require large deceleration.

[0096] Compact structure: Since the turbine gear can achieve a high transmission ratio, its structure is relatively compact, which can save space and is suitable for space-constrained devices such as window locks.

[0097] Smooth operation and low noise: The contact mode of the turbine gear is sliding contact, which makes the operation smoother and quieter, reducing the operating noise of the window lock.

[0098] Strong load-bearing capacity: The turbine gear transmission has a strong load-bearing capacity and can transmit the large torque required by the window lock.

[0099] The dual-chain window lock described in this application utilizes three turbine gear systems to control the movement and travel of two chains, ensuring secure window opening and closing. Each turbine gear system includes a top cover fixing screw and a matching rotating bearing. To facilitate assembly, the dual-chain window lock features a custom-designed center plate with fixed set screws. Left and right gear sets, which mate with the left and right chains, are placed on this base.

[0100] When the upper cover chain case is closed, the left and right gears of the upper cover chain case are exposed on the left and right sides of the upper cover. Test that the left and right hexagonal gears drive the left and right chains to extend and retract normally. After the test is completed, rotate the left and right chains back into the chain case.

[0101] Installation of the intermediate turbine group.

[0102] Install the left turbine with its left and right bearings on the drive shaft. Install the right turbine with its left and right bearings on the drive shaft. Install both drive shafts onto the center gear to form a stable transmission chain. Then, install them into the turbine and gear slots on the upper cover. Place the left turbine in the left gear slot and the right turbine in the right gear slot. Mark them L & R carefully to avoid misplacing them.

[0103] Check whether the three gears and turbine drive are properly matched and meshed. Cover the top covers of the left and right turbine groups and the middle cover of the middle turbine group.

[0104] Tighten the top cover screws of the three sets of turbine gears and test whether the three sets of turbine transmission engagement and synchronous transmission chain are correct.

[0105] Install the handle into the hexagonal hole at the turbine link, turn the handle, the handle coupling connector, the two sides of the connector buckle the two sides of the turbine, and drive the turbine to rotate together.

[0106] The turbine rotates and transmits power to the intermediate gear. There is a square hole in the middle of the intermediate gear, which is connected to the shafts on both sides, driving the shafts on both sides to rotate simultaneously.

[0107] The turbines, fixed to each end of the shaft, have square inner holes. The shaft drives the left and right turbines to rotate. The left turbine rotates clockwise, while the right turbine rotates counterclockwise.

[0108] The left and right turbines mesh and rotate, driving the corresponding left and right gears to rotate simultaneously. The left gear rotates clockwise, and the axially fixed hexagonal piece engages the left chain shaft, pushing the left chain outward. The right gear rotates counterclockwise, and the axially fixed hexagonal piece engages the right chain shaft, pushing the right chain outward.

[0109] To improve rotational efficiency, the present invention adopts a three-tooth turbine design with a 12-degree tilt angle, which improves the chain's retraction efficiency. After three-stage transmission, 26 turns of the handle can extend the chain by 26 sections, significantly improving user efficiency and comfort.

[0110] According to a double-chain window lock of the present application, a compact, strong and reliable double-chain window lock structure is formed through the cooperation of the middle plate 1 and other components, which can adapt to heavy windows and significantly improve the efficiency and comfort of user operation.

[0111] The coordinated structure of center plate 1, the left turbine gear system, the intermediate drive turbine gear assembly, the right turbine gear system, and the left and right chains 51 and 52 ensures bilateral symmetry in overall force distribution. Both the front and back sides of center plate 1 contain force-bearing and motion structures, effectively utilizing space while also balancing force distribution for smoother and more reliable product operation. The combination of the three transmission systems, including the turbine and gears, achieves excellent self-locking performance, a high transmission ratio, a compact structure, smooth operation, low noise, and a high load capacity.

[0112] The cooperation of the chain locking link 69 and the associated components can more conveniently and effectively achieve chain locking, while also reliably and conveniently indicating the locking status at the same time. In addition, the double chain design can make the chain self-locking by adjusting the transmission ratio of the turbine and the clearance of the turbine.

[0113] The special structural setting of the chain guide groove makes full use of the space and shortens the product length; the setting of multiple groove structures makes the middle plate 1 a porous three-dimensional plate structure with a plurality of reinforcing ribs while meeting the performance requirements, which makes the dead weight lighter and the load-bearing capacity stronger.

[0114] The integrated aluminum alloy shell can be customized in different colors according to customer needs. It can be made the same color as the customer's windows, which is more beautiful.

[0115] The special turbine gear design allows the use of traditional die-casting equipment to produce finished products, which can increase efficiency and reduce costs.

[0116] The above is a detailed introduction to the present invention. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there may be changes in the specific implementation methods and application scope. In summary, the contents of this specification should not be understood as limiting the present invention.

[0117] Through the description of the above embodiments, those skilled in the art can clearly understand that the present invention can be implemented. Of course, the above-listed situations are only examples, and the present invention is not limited thereto. Those skilled in the art should understand that other variations or simplifications of the technical solution of the present invention can be appropriately applied to the present invention and should be included in the scope of the present invention.

Claims

1. A double chain window lock, characterized in that: A middle plate (1) is provided, wherein a driving gear (21) and a driving turbine (22) for driving the driving gear (21) are provided in the middle of the front of the middle plate (1), and a left gear (31) and a left turbine (32) driving the same and a right gear (41) and a right turbine (42) driving the same are provided at both ends of the front of the middle plate (1), respectively. The driving gear (21) is connected to the left turbine (32) and the right turbine (42) through a left turbine transmission shaft (33) and a right turbine transmission shaft (43), respectively; the left gear (31) The left and right gears (41) are respectively arranged in positioning holes provided on the middle plate (1); the left gear (31) and the right gear (41) are respectively connected to the chain rotating gear (20) at one end of the back of the middle plate (1); chain guide grooves (5) are respectively provided at both ends of the back of the middle plate (1); the left chain (51) and the right chain (52) are respectively provided in the chain guide grooves (5); the left chain (51) and the right chain (52) are respectively engaged with the chain rotating gear (20) provided on the left gear (31) and the right gear (41).

2. A double chain window lock according to claim 1, characterized in that: The middle plate (1) is also provided with a lock head (6), and the lock head (6) is connected to a chain locking link (69) driven by the lock head (6) to move in a locking slide groove (106) provided on the middle plate (1), and the end of the chain locking link (69) is detachably inserted into a tooth groove on the chain rotating gear (20).

3. A double chain window lock according to claim 2, characterized in that: The lock head (6) is provided with an eccentric shaft (61) that rotates as the lock head inner core rotates, and one end of the chain locking link (69) is provided with a driving groove (690) that enables the chain locking link (69) to move as the eccentric shaft (61) rotates, and the eccentric shaft (61) is installed in the driving groove (690).

4. A double chain window lock according to claim 3, characterized in that: The chain locking link (69) includes a connecting portion (691) and a locking portion (692), wherein the connecting portion (691) is connected to the eccentric shaft (61), one end of the locking portion (692) is connected to the connecting portion (691), and the other end of the locking portion (692) is provided with a locking plate (693), and the locking plate (693) is detachably inserted into a tooth groove on the chain rotating gear (20).

5. A double chain window lock according to claim 4, characterized in that: The connecting portion (691) is also connected to a visual switch (62), and the visual switch (62) is provided with at least two indication areas with different markings; the front of the middle plate (1) is also provided with a face cover (11), and the face cover (11) is provided with a through hole, and a switch indication window (621) made of a transparent material is provided in the through hole. When the visual switch (62) moves with the chain locking link (69), at least one indication area is located behind the switch indication window (621).

6. A double chain window lock according to claim 1, characterized in that: The chain guide groove (5) comprises an upper guide groove (501) and a lower guide groove (502), wherein the upper guide groove (501) and the lower guide groove (502) are connected through an arc guide groove (503) near the middle of the middle plate (1), and the lower guide groove (502) is provided with an outlet arc groove (504) at the end near the middle plate (1), and the outlet arc groove (504) is connected with the external space; the left chain (51) and the right chain (52) are respectively arranged in the lower guide groove (502), and the left chain (51) and the right chain (52) are respectively provided with a chain head end (53) and a chain tail end (54), wherein the chain head end (53) extends out of the middle plate (1) through the outlet arc groove (504), and the chain tail end (54) extends into the upper guide groove (501) through the arc guide groove (503).

7. A double chain window lock according to claim 6, characterized in that: A deep guide groove (5011) is further provided on the top of the upper guide groove (501), and a limiting column (541) is further provided on the chain tail end (54), and the limiting column (541) is installed in the deep guide groove (5011).

8. A double chain window lock according to claim 7, characterized in that: The top of the middle plate (1) is provided with safety locks (59) on both sides of the driving gear (21), and the safety lock (59) is provided with a limiting hole (591) penetrating into the guide deep groove (5011). A safety latch shaft for preventing the chain tail end (54) from escaping from the upper guide groove (501) is fixed in the limiting hole (591), and the tail end of the safety latch shaft extends into the guide deep groove (5011) and is located between the limiting column (541) and the arc guide groove (503).

9. A double chain window lock according to claim 1, characterized in that: The driving turbine (22) is connected to a handle (23) capable of driving the driving turbine (22) to rotate. The handle (23) comprises a rotating arm (231) and a handle rod (232) connected to the rotating arm (231) in a relatively foldable manner.

10. A double chain window lock according to claim 1, characterized in that: A gear box fixing seat is provided on the side of the middle plate (1) where the driving turbine (22) is located. A gear box is installed on the gear box fixing seat, and a driving motor is connected to the gear box.

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