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 invention relates to the technical field of window locks. Background Art

[0002] Chain window locks are widely used to provide security protection while maintaining indoor ventilation. Existing chain window locks are usually single-chain designs, but with the increasing demand for energy saving and environmental protection, a large number of double-glazed windows have appeared on the market, and these windows are often heavy. Existing single-chain window locks cannot effectively support these heavy windows and have the problem of insufficient bearing capacity. Therefore, the development of a double-chain lock that can adapt to heavy windows has become an urgent need in the market. Summary of the invention

[0003] In view of the above situation, in order to solve the problems existing in the above technology, the present invention 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 two ends of the front side of the middle plate respectively, the driving gear is connected to 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 arranged 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 two ends of the back side of the middle plate, a left chain and a 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 arranged on the left gear and the right gear.

[0005] According to a double-chain window lock of the present application, a locking head is also provided on the middle plate, and a chain locking link is connected to the locking head and is driven by the locking 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 which rotates along with the rotation of the lock head inner core, and one end of the chain locking link is provided with a driving groove which enables the chain locking link to move along with the rotation of the eccentric shaft, and the eccentric shaft is installed in the driving groove.

[0007] The chain locking link includes a connecting portion and a locking portion, wherein 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 portion, and at least two indication areas with different markings are provided on the visual switch; a face cover is also provided on the front of the middle plate, and a through hole is provided on the face cover, 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 also provided on the top of the upper guide groove, and a limiting column is also 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 also 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 escaping from 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 matching structure of the middle plate, left turbine gear system, intermediate drive turbine gear assembly, right turbine gear system, and left and right chains makes the overall force symmetrical. Both the front and back of the middle plate have force and motion structures. While making full use of the space, it also fully balances the force distribution, making the product run more smoothly and reliably. Through the combination of three transmission structure systems including turbine and gear matching, it achieves excellent self-locking performance, large transmission ratio, compact structure, stable operation, low noise, high load capacity and other effects.

[0017] 3) Through the cooperation of the chain locking link and related components, the chain can be locked more conveniently and effectively, and the locking state can be reliably and conveniently indicated at the same time. In addition, the double chain design can make the chain self-locking well by adjusting the transmission ratio of the turbine and the clearance of the turbine.

[0018] 4) Through the special structural setting of the chain guide groove, the space is fully utilized and the product length is shortened; through the setting of multiple groove structures, while meeting the performance requirements, the middle plate becomes a porous three-dimensional plate structure with several reinforcing ribs, which has lighter self-weight and stronger bearing capacity.

[0019] 5) 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.

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

[0021] Figure 1 It 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 after removing the cover;

[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 Enlarged view of part C;

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

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

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

[0029] In the figure,

[0030] Medium board 1

[0031] Locking slide 106

[0032] Cover 11

[0033] Middle cover 12

[0034] Left gear cover 13

[0035] Right gear cover 14

[0036] Back panel 15

[0037] Chain turns gear 20

[0038] Driving gear 21

[0039] Drive turbine 22

[0040] Handle 23

[0041] Rotating arm 231

[0042] Handle bar 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 5

[0050] Upper guide groove 501

[0051] Guide deep groove 5011

[0052] Lower guide groove 502

[0053] Arc guide groove 503

[0054] Exit arc slot 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] Connection 691

[0069] Locking part 692

[0070] Locking plate 693 DETAILED DESCRIPTION

[0071] The 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 assist in the understanding of the exemplary embodiments of the present invention as defined by the claims and their equivalents. It includes various specific details to assist in understanding, but they are to be viewed as exemplary 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, in order to make the specification more clear and concise, detailed descriptions of functions and configurations 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, a driving gear 21 and a driving turbine 22 for driving the driving gear 21 to rotate are provided in the middle of the front side of the middle plate 1, a left gear 31 and a left turbine 32 driving it and a right gear 41 and a right turbine 42 driving it are provided at two ends of the front side of the middle plate 1, respectively, 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 arranged 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 arranged on the left gear 31 and the right gear 41.

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

[0074] The driving gear 21 is connected to the left turbine 32 and the right turbine 42 through the left turbine transmission shaft 33 and the right turbine transmission shaft 43, respectively. More specifically, the left side of the connecting shaft of the driving gear 21 is the left turbine transmission shaft 33 and the right turbine transmission shaft 43 are connected to form a whole. The left turbine 32 meshes with the left gear 31, and the right turbine 42 meshes with the right gear 41 to form a transmission connection. The transmission connection of the driving gear 21, the left turbine transmission shaft 33, the left turbine 32, the right turbine transmission shaft 43, and the right turbine 42 is a rigid connection and is a whole. The gear rotates and the turbine rotates, the left transmits to the left, and the right transmits to the right.

[0075] 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 the tooth groove on the chain rotating gear 20. When the chain locking link 69 is locked, the link can jump by spring compression when the chain is retracted in the forward direction, and cannot rotate due to the ratchet structure of the locking slide groove 106 when the chain is withdrawn in the reverse direction.

[0076] The lock head 6 is provided with an eccentric shaft 61 which rotates along with the rotation of the lock head inner core. One end of the chain locking link 69 is provided with a driving groove 690 which enables the chain locking link 69 to move along with the rotation of the eccentric shaft 61 . 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] 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 side 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 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, 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 at the top of the upper guide groove 501, and a limit column 541 is further provided on the chain tail end 54, and the limit column 541 is installed in the guide deep groove 5011. The chain tail end 54 stops moving at the end of the guide groove.

[0081] 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 deep guide groove 5011, and a safety latch shaft for preventing the tail end 54 of the chain 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 deep guide groove 5011 and is located between the limiting column 541 and the arc guide groove 503. For safety, the user can set the extension length of the chain to, for example, 100 mm or 105 mm, so as to ensure that the window is not fully opened.

[0082] The driving turbine 22 is connected to a handle 23 that can drive the driving turbine 22 to rotate. The handle 23 includes a rotating arm 231 and a handle rod 232 that can be relatively folded and connected to the rotating arm 231. By rotating the turbine handle in the middle, two chains can be connected to support the window at the same time. Alternatively, a gear box fixing seat is provided on the side of the middle plate 1 where the driving turbine 22 is located, and a gear box is installed on the gear box fixing seat, and a driving motor is connected to the gear box.

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

[0084] The front side of the middle plate 1 is also provided with a face cover 11, the middle cover 12, the left gear cover 13, and the right gear cover 14 are located inside the face cover 11, and the back side of the middle plate 1 is also provided with a back plate 15, the left chain 51 and the right chain 52 are arranged on the inner side of the back plate 15, and 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, the driving turbine 22, the left gear 31, the left turbine 32, the right gear 41 and the 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 so as to be relatively rotatable through bearing mechanisms such as sliding bearing structures or rolling bearing structures. The mounting holes can be set on a certain plate or can be composed of a combination of structural features on multiple plates. They can be set according to existing positioning technologies for 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 visual switch 62 is designed with a switch indicator plate fixed on the chain locking link. 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 link is moved by the pressure of the retaining spring and a red indicator plate is displayed in the window to indicate the locked state.

[0088] According to a double chain window lock of the present application, the gear clearance between the driving gear 21 and the driving turbine 22 is greater than or less than the gear clearance between the left gear 31 and the left turbine 32 and the gear clearance between the right gear 41 and the right turbine 42. The present application adopts a 2-stage turbine + helical gear transmission, and the clearance of the active turbine is different from the clearance of the secondary turbine, which is better for self-locking.

[0089] 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, and the handle 23 includes a rotating arm 231 and a handle rod 232 that can be relatively folded and connected to the rotating arm 231. The handle rod can be bent and embedded in the rotating arm.

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

[0091] According to the double chain window lock of the present application, a special transmission ratio of the turbine size can be used to allow the chain to rotate one circle and one chain section to come out. The speed is moderate.

[0092] According to a double-chain window lock of the present application, a safety latch shaft, i.e., a safety rod, is fixedly disposed in the limiting hole 591 to prevent the chain tail end 54 from coming out of the upper guide groove 501, and the tail end of the safety latch shaft extends into the deep guide groove 5011 and is located between the limiting column 541 and the arc-shaped guide groove 503. Through the size design, after the safety latch shaft is installed, it can be ensured that the chain stops when it comes out 100 mm, thereby ensuring the 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 to rotate, the worm wheel cannot drive the worm to rotate in the reverse 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 a 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 less noisy, 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 larger torque required by the window lock.

[0099] According to the double chain window lock of the present application, the in and out and travel of two sets of chains are controlled by three sets of turbine systems to realize the safe opening and closing of the window. Each set of turbine gear system includes upper cover fixing screws and matching rotating bearings. For easy assembly, the double chain window lock is equipped with a special middle plate with fixed positioning screw columns, left and right gear sets, matched with left and right chains, placed on this base.

[0100] When the upper cover chain box is closed, the left and right gears of the upper cover chain box are exposed on the left and right sides of the upper cover. Test the normal extension and retraction of the left and right chains driven by the left and right hexagonal teeth. After the test is completed, rotate the left and right chains back into the chain box.

[0101] Installation of the intermediate turbine group.

[0102] The left turbine is installed on the transmission shaft with the left and right bearings, and the right turbine is installed on the transmission shaft with the left and right bearings. Then install the two transmission shafts on the middle gear at the same time to form a stable transmission chain shaft. Then assemble them into the turbine slot and gear slot of the upper cover. The left turbine is placed in the left gear slot, and the right turbine is placed in the right gear slot. Mark them L&R and do not put them in the wrong place.

[0103] Check whether the three sets of gears and turbine transmission are properly matched and meshed. Cover the top covers of the left and right turbine sets and the middle cover of the middle turbine set.

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

[0105] Install the handle into the hexagonal hole at the turbine connection, turn the handle, the handle is coupled to the connecting piece, and the two sides of the connecting piece buckle the two sides of the turbine to 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 at both ends of the shafts have square inner holes. The shaft drives the left and right turbines to rotate. The left turbine rotates clockwise, and the right turbine rotates counterclockwise.

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

[0109] In order to improve the rotation efficiency, the present invention adopts a 3-tooth turbine design with an inclination angle of 12 degrees, which improves the chain's telescopic efficiency. After 3-stage transmission, the handle can be rotated 26 times to extend the chain by 26 sections, which significantly improves the efficiency and comfort of user operation.

[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, so that it can adapt to heavy windows and significantly improve the efficiency and comfort of user operation.

[0111] The matching structure of the middle plate 1, the left turbine gear system, the intermediate drive turbine gear assembly, the right turbine gear system, and the left chain 51 and the right chain 52 makes the overall force symmetrical. The front and back of the middle plate 1 have force and motion structures. While making full use of the space, the force distribution is also fully balanced, making the product run more smoothly and reliably. The combination of the three transmission structure systems including the turbine and the gear achieves excellent self-locking performance, large transmission ratio, compact structure, stable operation, low noise, high load capacity and other effects.

[0112] Through the cooperation of the chain locking link 69 and the associated components, the chain can be locked more conveniently and effectively, and the locking state can be reliably and conveniently indicated at the same time. In addition, the double chain design can make the chain self-locking well by adjusting the transmission ratio of the turbine and the clearance of the turbine.

[0113] Through the special structural setting of the chain guide groove, the space is fully utilized and the product length is shortened; through the setting of multiple groove structures, while meeting the performance requirements, the middle plate 1 becomes a porous three-dimensional plate structure with a number of reinforcing ribs, which has a lighter dead weight and a stronger bearing capacity.

[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 can be produced using traditional die-casting equipment, which can increase efficiency and reduce costs.

[0116] The present invention has been introduced in detail above. 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 of the present invention and its core idea. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content 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 according to 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, It is 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 side 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 side of the middle plate (1), respectively; 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) The left and right gears (41) are respectively arranged in positioning holes arranged 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 side of the middle plate (1); chain guide grooves (5) are respectively arranged at both ends of the back side of the middle plate (1); the left chain (51) and the right chain (52) are respectively arranged in the chain guide grooves (5); the left chain (51) and the right chain (52) are respectively meshed with the chain rotating gears (20) arranged on the left gear (31) and the right gear (41).

2. A double chain window lock according to claim 1, It is 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) which is 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) can be detachably inserted into a tooth groove on the chain rotating gear (20).

3. A double chain window lock according to claim 2, It is characterized in that The lock head (6) is provided with an eccentric shaft (61) that rotates along with the rotation of the lock head inner core, 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 along with the rotation of the eccentric shaft (61), and the eccentric shaft (61) is installed in the driving groove (690).

4. A double chain window lock according to claim 2, It is characterized in that The chain locking link (69) comprises 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 a tooth groove on the chain rotating gear (20).

5. A double chain window lock according to claim 4, It is 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 cover (11), and the 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, and 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, It is characterized in that The chain guide groove (5) comprises an upper guide groove (501) and a lower guide groove (502); the upper guide groove (501) and the lower guide groove (502) are connected through an arc-shaped guide groove (503) at a middle portion close to the middle plate (1); the lower guide groove (502) is provided with an outlet arc groove (504) at an end portion close to the middle plate (1); the outlet arc groove (504) is connected with an external space; the left chain (51) and the right chain (52) are respectively arranged in the lower guide groove (502); the left chain (51) and the right chain (52) are respectively provided with a chain head end (53) and a chain tail end (54); the chain head end (53) extends out of the middle plate (1) through the outlet arc groove (504); and the chain tail end (54) passes through the arc-shaped guide groove (503) to the upper guide groove (501).

7. A double chain window lock according to claim 6, It is characterized in that A deep guide groove (5011) is also provided at the top of the upper guide groove (501), and a limiting column (541) is also 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, It is 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 deep guide groove (5011). A safety latch shaft is fixed in the limiting hole (591) for preventing the tail end (54) of the chain from escaping from the upper guide groove (501), and the tail end of the safety latch shaft extends into the deep guide 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, It is 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, It is 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.

Images