Rotary latch for roller blinds

Abstract

This utility model relates to the field of roller shutter lock technology, specifically to a rotary latch lock for roller shutters. The utility model includes the following structure: a positioning groove is formed by a central indentation at the end of the lock body; semi-circular stepped protrusions of different heights are formed on both sides of the positioning groove; the lock cylinder can be opened by applying pressure from the front of the key or by applying pull force from the back of the handle, causing the wedge-shaped protrusion of the latch to leave the positioning groove of the lock body, achieving a dual-operation rotation of the latch; the latch includes a mounting hole that mates with the lock cylinder and a U-shaped groove that mates with a stop bar; the inner side of the mounting hole has a wedge-shaped protrusion. This utility model provides users with multiple options for opening or locking by dual-operation rotation using pressure from the front of the key or by applying pull force from the back of the handle; and the latch can only rotate 180° in one direction. The stepped protrusions of the lock body, the preload spring, and the wedge-shaped protrusion of the latch work together to effectively prevent misoperation and ensure accurate locking of the lock in a fixed position.

Description

Technical Field

[0001] This utility model relates to the field of roller shutter lock technology, specifically to a rotary latch lock for roller shutters. Background Technology

[0002] With the acceleration of rail transit, the demand for roller blinds is becoming more diverse. While conventional roller blinds can stop at any position, they cannot lock in that position, prompting continuous exploration by engineers. For example, the free-spinning lock cylinder disclosed in Chinese Patent Publication No. CN201705014U uses a sliding pin and groove mechanism to engage the bolt and lock body. However, this solution has drawbacks: firstly, existing roller blind locks have a single operation method, either only allowing key unlocking or lacking alternative operation methods, making them inconvenient to use; secondly, the bolt lacks an effective anti-misoperation design, making it prone to accidental rotation due to external vibrations, collisions, or human error during normal use, causing the roller blind to become unstable and affecting normal use and safety. Utility Model Content

[0003] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide a rotary latch lock for roller blinds.

[0004] The technical solution adopted in this utility model is as follows:

[0005] A rotary latch lock for roller blinds includes the following structure:

[0006] The lock body has a positioning groove formed by a central indentation at its end. Semi-circular stepped bosses of different heights are formed on both sides of the positioning groove, which are divided into high bosses and low bosses.

[0007] The lock cylinder is spring-loaded into the lock body. The spring is positioned between the inner wall shoulder of the lock body and the lock cylinder flange. The lock cylinder applies a preload force to the bolt. The end of the lock cylinder is fixedly connected to the handle by a limit screw. The lock cylinder can be used to apply pressure from the front of the key or pull from the back of the handle to make the wedge-shaped protrusion of the bolt leave the positioning groove of the lock body, thus realizing the dual-operation rotation of the bolt.

[0008] The latch includes a mounting hole that mates with the lock cylinder and a U-shaped groove that mates with the stop bar. Inside the mounting hole is a wedge-shaped boss that mates with a stepped boss. The width of the wedge-shaped boss is less than the width of the positioning groove, and the height ensures that the range of motion is limited to between the positioning groove and the short boss.

[0009] This technical solution utilizes a lock body and a handle on each side of the lock cylinder, combined with the cooperation of components such as the stepped boss on the lock body, the wedge-shaped boss on the bolt, and springs, to achieve dual-operation rotation of the bolt from both the front and back for opening or locking, as well as unidirectional 180° rotation of the bolt. This effectively prevents accidental operation and ensures the lock is locked in a fixed position. By installing a mounting plate and an adjustable mounting nut on the outside of the lock body, the fit between the mounting plate and the mounting surface can be adjusted according to the actual situation of the mounting surface, ensuring the mounting plate is tightly fixed to the mounting surface. The stepped boss is divided into a high boss and a low boss. The high boss prevents the wedge-shaped boss on the bolt from disengaging, while the low boss guides the bolt to rotate 180° unidirectionally along its surface, ensuring bolt stability and correct rotation direction. By confining the spring between the inner wall shoulder of the lock body and the flange of the lock cylinder, the spring applies a preload force to the bolt through the lock cylinder, keeping the bolt in a stable position during normal operation. At the same time, by applying pressure from the front of the key or applying pull force from the back of the handle, the wedge-shaped protrusion of the bolt is disengaged from the positioning groove of the lock body, realizing the dual-operation rotation of the bolt and providing users with multiple unlocking options.

[0010] In addition, the rotary latch lock for roller blinds proposed above according to this utility model may also have the following additional technical features:

[0011] According to one embodiment of the present invention, the high boss and the low boss are semi-circular rings of different heights. The high boss and the low boss are recessed inward to form a positioning groove. The locking tongue is raised from the positioning groove on one side and enters the low boss. It is then limited by the high boss and enters the positioning groove on the other side for locking.

[0012] In this technical solution, the stepped boss of the lock body, the preload spring, and the wedge-shaped boss of the lock tongue cooperate with each other to ensure that the lock tongue can only rotate in one direction, which can effectively prevent misoperation.

[0013] According to one embodiment of the present invention, the inner wall of the lock body is provided with a shoulder, the lock cylinder is provided with a flange, and a spring is engaged between the shoulder and the flange. The spring is a pre-compressed helical spring.

[0014] This technical solution uses a spring to apply pressure from the front or tension from the back, which can cause the bolt protrusion to leave the lock body positioning groove, thus enabling the bolt to rotate.

[0015] According to one embodiment of the present invention, a washer, a mounting plate and a mounting nut are sleeved on the outer side of the lock body. The washer is sleeved on the outer end face of the lock body, and the mounting plate has a U-shaped cross section for fixing the lock body to the mounting surface. The mounting nut adjusts the fit between the mounting plate and the mounting surface.

[0016] In this technical solution, the mounting plate is sized to fit the roller blind rod and is used to fix the lock body onto the roller blind rod.

[0017] According to one embodiment of the present invention, the compression stroke of the spring is greater than the height of the wedge-shaped boss and less than the height of the high boss, so that the locking tongue can only rotate along the low boss after leaving the positioning groove.

[0018] In this technical solution, when in the open or locked position, the bolt boss is within the lock body limiting groove. During rotation, the bolt leaves the lock body limiting groove and rotates along the lower boss surface of the lock body. A preloaded spring, with a suitable compression stroke, ensures that the bolt rotates along the lower boss surface of the lock body.

[0019] According to one embodiment of the present invention, the handle is fixedly connected to the lock cylinder by a limiting screw, and a pulling force is applied to the back to drive the lock cylinder to move.

[0020] This technical solution uses a dual-operation lock cylinder, with a dedicated key connected to the front end and a handle connected to the rear end.

[0021] According to one embodiment of the present invention, a limiting nut is provided on the outer side of the lock cylinder, and the limiting nut and the stepped boss together limit the rotation range of the lock tongue.

[0022] According to one embodiment of the present invention, the stop bar is disposed at the bottom of the back of the side slide rail and cooperates with the U-shaped groove of the locking tongue to realize the locking of the roller shutter.

[0023] Compared with the prior art, this utility model has the following advantages:

[0024] The lock offers users multiple options for opening or locking via a dual-operation rotary mechanism: applying pressure with a key from the front or pulling with a torque lever from the back. The bolt can only rotate 180° in one direction. The stepped bosses of the lock body, the preload spring, and the wedge-shaped bosses of the bolt work together to effectively prevent misoperation and ensure that the lock is accurately locked in a fixed position. Attached Figure Description

[0025] Figure 1 This is a cross-sectional view of the present invention.

[0026] Figure 2 This is one of the state diagrams of this utility model.

[0027] Figure 3 This is the second state diagram of this utility model.

[0028] Figure 4 This is a perspective view of the present invention.

[0029] Figure 5 This is one of the usage diagrams of this utility model.

[0030] Figure 6 This is the second illustration of the application of this utility model.

[0031] In the diagram: 1. Lock body; 11. Positioning groove; 12. High boss; 13. Low boss; 14. Lock cylinder; 15. Spring; 2. Washer; 3. Mounting plate; 4. Mounting nut; 5. Lock tongue; 51. Wedge-shaped boss; 52. U-shaped groove; 6. Limit nut; 7. Twist handle; 8. Limit screw; 9. Side slide; 91. Stop bar. Detailed Implementation

[0032] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0033] Example 1

[0034] like Figures 1 to 6 As shown, this embodiment provides a rotary latch for roller blinds, including the following structure:

[0035] The lock body 1 has a positioning groove 11 formed by recessing inward along the center at its end. Semi-circular stepped bosses of different heights are formed on both sides of the positioning groove 11, which are divided into a high boss 12 and a low boss 13.

[0036] The lock cylinder 14 is secured inside the lock body 1 by a spring 15. The spring 15 is positioned between the inner wall shoulder of the lock body 1 and the flange of the lock cylinder 14. The lock cylinder 14 applies a preload force to the bolt 5. The end of the lock cylinder 14 is fixedly connected to the handle 7 by a limiting screw 8. The lock cylinder 14 can be pressed by the front of the key or pulled by the back of the handle 7 to make the wedge-shaped protrusion 51 of the bolt 5 leave the positioning groove 11 of the lock body 1, thereby realizing the double-operation rotation of the bolt 5.

[0037] The latch 5 includes a mounting hole that mates with the lock cylinder 14 and a U-shaped groove that mates with the stop bar 91; the inner side of the mounting hole has a wedge-shaped boss 51, which mates with the stepped boss. The width of the wedge-shaped boss 51 is smaller than the width of the positioning groove 11, and the height ensures that the range of motion is limited to between the positioning groove 11 and the short boss 13.

[0038] like Figures 1 to 6As shown, this technical solution, by setting a lock body 1 and a handle 7 on both sides of the lock cylinder 14, and combining the stepped boss of the lock body 1, the wedge-shaped boss 51 of the bolt 5, the spring 15, and other components, enables the bolt 5 to be opened or locked by rotation from both the front and back, as well as to rotate the bolt 5 180° in one direction. This effectively prevents misoperation and ensures that the lock is locked in a fixed position. By setting a mounting plate 3 and an adjustable mounting nut 4 on the outside of the lock body 1, the fit between the mounting plate 3 and the mounting surface can be adjusted according to the actual situation of the mounting surface during installation, ensuring that the mounting plate 3 is tightly fixed to the mounting surface. By dividing the stepped boss into a high boss 12 and a low boss 13, the high boss 12 prevents the wedge-shaped boss 51 on the bolt 5 from disengaging, while the low boss 13 guides the bolt 5 to rotate 180° in one direction along its surface, ensuring that the bolt 5 is stable and rotates in the correct direction. By confining the spring 15 between the inner wall shoulder of the lock body 1 and the flange of the lock cylinder 14, the spring 15 applies a preload force to the bolt 5 through the lock cylinder 14, allowing the bolt 5 to maintain a stable position in daily life. At the same time, by applying pressure from the front of the key or applying pull force from the back of the knob 7, the wedge-shaped protrusion 51 of the bolt 5 is disengaged from the positioning groove 11 of the lock body 1, realizing the dual-operation rotation of the bolt 5 and providing users with multiple unlocking options.

[0039] In addition, the rotary latch lock for roller blinds proposed above according to this utility model may also have the following additional technical features:

[0040] According to one embodiment of the present invention, the high boss 12 and the low boss 13 are semi-circular rings of different heights. The high boss 12 and the low boss 13 are recessed inward to form a positioning groove 11. The locking tongue 5 is lifted from the positioning groove 11 on one side and enters the low boss 13, and is limited by the high boss 12 to enter the positioning groove 11 on the other side for locking.

[0041] In this technical solution, the stepped boss of the lock body 1, the preload spring 15, and the wedge-shaped boss 51 of the lock tongue 5 cooperate with each other to ensure that the lock tongue 5 can only rotate in one direction, which can effectively prevent misoperation.

[0042] According to one embodiment of the present invention, the inner wall of the lock body 1 is provided with a shoulder, the lock cylinder 14 is provided with a flange, and the spring 15 is engaged between the shoulder and the flange. The spring 15 is a pre-compressed helical spring.

[0043] This technical solution uses a spring 15 to apply pressure from the front or tension from the back, which allows the bolt 5 to move away from the positioning groove 11 of the lock body 1, thus enabling the bolt 5 to rotate.

[0044] According to one embodiment of the present invention, a washer 2, a mounting plate 3 and a mounting nut 4 are sleeved on the outer side of the lock body 1. The washer 2 is sleeved on the outer end face of the lock body 1. The mounting plate 3 has a U-shaped cross section and is used to fix the lock body 1 on the mounting surface. The mounting nut 4 adjusts the fit between the mounting plate 3 and the mounting surface.

[0045] In this technical solution, the mounting plate 3 is sized to match the roller blind rod and is used to fix the lock body 1 onto the roller blind rod.

[0046] According to one embodiment of the present invention, the compression stroke of the spring 15 is greater than the height of the wedge-shaped boss 51 and less than the height of the high boss 12, so that the locking tongue 5 is only allowed to rotate along the low boss 13 after leaving the positioning groove 11.

[0047] In this technical solution, when in the open or locked position, the bolt 5 protrusion is within the limiting groove of the lock body 1. During rotation, the bolt 5 leaves the limiting groove of the lock body 1 and rotates along the surface of the low protrusion 13 of the lock body 1. The preload spring 15 is set with an appropriate compression stroke to ensure that the bolt 5 rotates along the surface of the low protrusion 13 of the lock body 1.

[0048] According to one embodiment of the present invention, the handle 7 is fixedly connected to the lock cylinder 14 by a limiting screw 8, and a pulling force is applied to the back to drive the lock cylinder 14 to move.

[0049] This technical solution uses a dual-operation lock cylinder 14, with a dedicated key connected to the front end and a handle 7 connected to the rear end.

[0050] According to one embodiment of the present invention, a limiting nut 6 is provided on the outer side of the lock cylinder 14, and the limiting nut 6 and the stepped boss together limit the rotation range of the lock tongue 5.

[0051] According to one embodiment of the present invention, the stop bar 91 is disposed at the bottom of the back of the side slide 9 and cooperates with the U-shaped groove of the locking tongue 5 to realize the locking of the roller shutter.

[0052] The usage process of the above embodiments is as follows:

[0053] like Figures 1 to 6 As shown, during normal locking, the spring 15 applies a preload force to the bolt 5 through the lock cylinder 14. The wedge-shaped boss 51 of the bolt 5 is located in the positioning groove 11 of the lock body 1 and cooperates with the U-shaped groove of the stop bar 91 to keep the roller shutter in a locked state.

[0054] There are two ways to open the lock cylinder. If using a key, insert the key into the front of the lock cylinder 14 and apply pressure from the front to overcome the spring force of the spring 15. This causes the lock cylinder 14 to move the bolt 5, causing the wedge-shaped protrusion 51 of the bolt 5 to leave the positioning groove 11, rise upwards into the lower protrusion 13, and then be limited by the higher protrusion 12 before entering the positioning groove 11 on the other side, achieving a 180° unidirectional rotation to open. If using the handle 7, apply pulling force to the back of the end of the lock cylinder 14. This also causes the lock cylinder 14 to overcome the spring force of the spring 15, allowing the wedge-shaped protrusion 51 of the bolt 5 to leave the positioning groove 11 and rotate to open along the same path.

[0055] Because the compression stroke of spring 15 is greater than the height of wedge-shaped boss 51 but less than the height of high boss 12, the bolt 5 can only rotate along the low boss 13 after leaving the positioning groove 11. The limiting nut 6 on the outside of the lock cylinder 14, together with the stepped boss, limits the rotation range of the bolt 5 to prevent it from rotating excessively. After opening, releasing the key or handle 7 causes spring 15 to return to its original deformation, and the bolt 5 can rotate back to the positioning groove 11 along the opposite path, cooperating with the stop lever 91 again to lock the roller shutter.

[0056] Although the present invention has been described in detail with reference to the accompanying drawings and preferred embodiments, it is not limited thereto. Various equivalent modifications or substitutions can be made to the embodiments of the present invention by those skilled in the art without departing from the spirit and essence of the present invention, and such modifications or substitutions should all be within the scope of the present invention. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should also be included within the protection scope of the present invention. Therefore, the protection scope of the present invention should be determined by the scope of the claims.

Claims

1. A tumbler lock for a roller shade, the tumbler lock comprising: Includes the following structure: The lock body (1) has a positioning groove (11) formed by recessing the end of the lock body inward along the center. Semi-circular stepped bosses of different heights are formed on both sides of the positioning groove (11), which are divided into high bosses (12) and low bosses (13). The lock cylinder (14) is secured inside the lock body (1) by a spring (15). The spring (15) is positioned between the inner wall shoulder of the lock body (1) and the flange of the lock cylinder (14). The lock cylinder (14) applies a preload force to the bolt (5). The end of the lock cylinder (14) is fixedly connected to the handle (7) by a limiting screw (8). The lock cylinder (14) can be pressed by the front of the key or pulled by the back of the handle (7) to make the wedge-shaped protrusion (51) of the bolt (5) leave the positioning groove (11) of the lock body (1), thereby realizing the double-operation rotation of the bolt (5). The latch (5) includes a mounting hole that mates with the lock cylinder (14) and a U-shaped groove that mates with the stop bar (91). Inside the mounting hole is a wedge-shaped boss (51). The wedge-shaped boss (51) mates with the stepped boss. Its width is less than the width of the positioning groove (11), and its height ensures that the range of motion is limited to between the positioning groove (11) and the short boss (13).

2. The tumbler lock for a roller shade of claim 1, wherein, The high boss (12) and the low boss (13) are semi-circular rings of different heights. The high boss (12) and the low boss (13) are recessed inward to form a positioning groove (11). The locking tongue (5) is lifted from the positioning groove (11) on one side and enters the low boss (13), and is limited by the high boss (12) to enter the positioning groove (11) on the other side for locking.

3. The tumbler lock for a roller shade of claim 1, wherein, The inner wall of the lock body (1) is provided with a shoulder, the lock cylinder (14) is provided with a flange, and the spring (15) is engaged between the shoulder and the flange. The spring (15) is a pre-compressed helical spring.

4. The tumbler lock for a roller shade of claim 1 or 3, wherein, The lock body (1) is fitted with a gasket (2), a mounting plate (3) and a mounting nut (4) on its outer side. The gasket (2) is fitted onto the outer end face of the lock body (1). The mounting plate (3) has a U-shaped cross section and is used to fix the lock body (1) on the mounting surface. The mounting nut (4) adjusts the fit between the mounting plate (3) and the mounting surface.

5. The tumbler lock for a roller shade of claim 1, wherein, The compression stroke of the spring (15) is greater than the height of the wedge-shaped boss (51) and less than the height of the high boss (12), so that the locking tongue (5) can only rotate along the low boss (13) after leaving the positioning groove (11).

6. The tumbler lock for a roller shade of claim 1, wherein, The handle (7) is fixedly connected to the lock cylinder (14) by the limiting screw (8), and the pull force applied on the back drives the lock cylinder (14) to move.

7. The tumbler lock for a roller shade of claim 1, wherein, The lock cylinder (14) is provided with a limiting nut (6) on the outside. The limiting nut (6) and the stepped boss together limit the rotation range of the lock tongue (5).

8. The tumbler lock for a roller shade of claim 1, wherein, The stop bar (91) is located at the bottom of the back of the side slide (9) and cooperates with the U-shaped groove of the locking tongue (5) to lock the roller shutter.

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