Door handle lock

Abstract

The invention relates to the technical field of locks, in particular to a door handle lock which is characterized in that a swing rod rotationally connected to a lock shell and a handle main shaft assembly used for driving the swing rod to swing are arranged in the lock shell; a lock cylinder is arranged in the lock shell; the shifting wheel of the lock cylinder rotates to drive the dead bolt fixing piece to move; the swing rod is connected to the latch bolt assembly. The clamping grooves are arranged along the sliding direction of the dead bolt; a positioning clamping piece is rotationally connected into the lock shell. A clamping hook and an arc convex shape are arranged on the surface of the positioning clamping piece; the height of the arc convex shape is firstly increased and then reduced along the swinging direction of the shifting wheel; compression springs are fixed to the bottoms of the positioning clamping pieces. The two ends of the compression spring are pressed on the lock shell and the positioning clamping piece respectively. When the door handle lock is used, the overturning action of the clamping hook used for locking the fixing piece is in the thickness direction of the whole door handle lock, the design distance between the dead bolt and the inclined bolt assembly does not need to consider the stroke of the clamping hook, the length of the whole lock can be smaller, and use is more flexible.

Description

Technical Field

[0001] This invention relates to the field of lock technology, and in particular to a door handle lock. Background Technology

[0002] In the field of lock structure design, the latch bolt and the square bolt are key components for realizing the core functions of a lock. The two have a clear division of labor and work together to ensure the security of the door's closing and locking. The latch bolt is mainly used for the initial positioning of the door after it is closed, so that the door can stably fit against the door frame and avoid shaking. The square bolt is mainly responsible for the door's locking function. By switching between its extended and retracted states, it can lock and unlock the door. It is one of the core structures that ensures the anti-theft performance of the lock.

[0003] Currently, in existing lock latch structures, the mechanism used to lock and position the latch and ensure its stability under different extension amounts generally employs a sliding plate inside the lock housing. The movement and reset of this plate rely on the cooperation of a lock cylinder derailleur and a spring: when the lock cylinder rotates, the derailleur drives the plate to slide in a specific direction, releasing the latch's restriction; when the lock cylinder resets or the spring rebounds, the plate slides in the opposite direction, re-engaging with the corresponding positioning structure of the latch, thus completing the positioning of the latch in different states such as extended locking and retracted unlocking.

[0004] However, the existing square tongue locking and positioning structure has inherent design limitations: because the sliding direction of the square tongue (usually along the thickness of the lock and perpendicular to the door surface) needs to intersect with the sliding direction of the locking plate in order to achieve effective locking and limiting of the square tongue by the locking plate, the sliding trajectory of the locking plate is strictly limited based on this structural constraint, and it can only move in the direction of the oblique tongue, and cannot achieve flexible sliding in other directions.

[0005] This design limitation directly affects the overall layout of the lock: inside the lock housing, the installation distance between the handle shaft and the lock cylinder needs to allow sufficient sliding travel for the latch plate to ensure smooth sliding and proper positioning of the latch bolt, preventing interference with the handle shaft, lock cylinder, and other components during sliding. This necessitates a larger installation gap between the handle shaft and the lock cylinder, forcing an increase in the overall length of the lock housing and making it difficult to achieve a compact lock volume design.

[0006] As home decoration, door and window manufacturing and other fields continue to increase the requirements for lock size, miniaturization has become the mainstream trend in lock design. The problem of the overall size of locks being too large due to the limited sliding direction of the locking plate in the existing square tongue structure has become a key bottleneck restricting the development of lock miniaturization and cannot meet the market's demand for compact and aesthetically pleasing locks. Summary of the Invention

[0007] The purpose of this invention is to provide a door handle lock that addresses the shortcomings and deficiencies of the prior art.

[0008] To achieve the above objectives, the technical solution adopted by the present invention is as follows: The present invention discloses a door handle lock, comprising a lock housing, a square latch slidably connected inside the lock housing, a square latch fixing piece fixed to the square latch, and a latch assembly slidably connected inside the lock housing; a rocker arm rotatably connected to the lock housing and a handle spindle assembly for driving the rocker arm to swing are disposed inside the lock housing; a lock cylinder is disposed inside the lock housing; the rotating wheel of the lock cylinder drives the square latch fixing piece to move; the rocker arm is connected to the latch assembly; The square tongue fixing plate is provided with a slot and a locking groove; the number of slots is at least two; the slots are arranged along the sliding direction of the square tongue; a positioning card is rotatably connected inside the lock housing; the surface of the positioning card is provided with a hook and an arc-shaped protrusion; the height of the arc-shaped protrusion first increases and then decreases along the swing direction of the dial wheel; a compression spring is fixed to the bottom of the positioning card; the two ends of the compression spring are respectively pressed against the lock housing and the positioning card.

[0009] Furthermore, the positioning card has a rotating shaft at the end away from the hook; the rotating shaft is rotatably connected inside the lock housing; the positioning card has an avoidance notch; and the lock cylinder is inserted into the avoidance notch.

[0010] Furthermore, the rotating shaft is a cylindrical structure formed by rolling the edges of the positioning card; there are two rotating shafts; the rotating shafts are respectively arranged on both sides of the positioning card; the lock housing consists of a rear housing, a front housing, and side sealing plates; a sealing plate guide sleeve that is slidably connected to the square tongue is provided on the inner wall of the side sealing plate; the rear housing is provided with an arc-shaped bent plate with an opening away from the front housing; the inner radius of the arc-shaped bent plate is equal to the outer radius of the cylindrical structure; the rotating shafts are respectively inserted into the arc-shaped bent plates on both sides; an extension plate is provided at the end of the arc-shaped bent plate; A rear baffle is provided on the front housing; a rear baffle support bar is provided on the rear baffle; the rear baffle support bar abuts against the side of the extension plate facing away from the rotating shaft; a bent bar is provided on the rear baffle and riveted to the outer surface of the rear housing. The card protrusion, hook, and rotating shaft are integrally stamped; the rear baffle and rear support strip are integrally stamped; the arc-shaped bending plate and extension plate are integrally stamped.

[0011] Furthermore, the latch assembly includes a guide sleeve fixed on the lock housing, a sliding rod slidably connected within the guide sleeve, a tension spring sleeved outside the sliding rod, and a latch fixed on the sliding rod; two fixing plates are fixed on the sliding rod; a sliding groove is formed between the two fixing plates; a push post slidably connected to the sliding groove is fixed on the rocker arm; and both ends of the tension spring are respectively fixed on the guide sleeve and the sliding rod.

[0012] Furthermore, there are three slots; there are two locking slots; the three slots are a first slot, a second slot, and a third slot arranged sequentially away from the square latch; the two locking slots are an inner locking slot and a deadbolt slot arranged sequentially away from the square latch; a folding rod is connected between the rocker arm and the latch fixing piece; when the hook is facing the third slot, the folding rod exerts a pulling force on the rocker arm towards the square latch; when the hook is facing the second slot, the folding rod is folded and does not exert a pulling force on the rocker arm; when the hook is facing the first slot and the latch assembly is fully retracted into the lock housing, the folding rod exerts a pulling force on the rocker arm away from the square latch.

[0013] Furthermore, the folding rod consists of a second connecting piece with one end hinged to the square tongue fixing piece and a first connecting piece with one end hinged to the swing rod; the other end of the second connecting piece and the other end of the second connecting piece and the first connecting piece are hinged together.

[0014] Furthermore, a stop post is fixed on the lock housing; the stop post is disposed on the swing path of the second connecting piece; the stop post is disposed on the side of the second connecting piece away from the hook.

[0015] Furthermore, a sealing plate guide sleeve that matches the square tongue is fixed inside the lock housing; the square tongue is inserted into the sealing plate guide sleeve; a guide post is fixed inside the lock housing; a square tongue guide groove that is slidably connected to the guide post is opened on the square tongue fixing piece; the square tongue guide groove extends along the length direction of the sealing plate guide sleeve.

[0016] Furthermore, a positioning piece is provided on the fixing plate; a front shell guide groove is provided on the lock housing; the width of the front shell guide groove is equal to the width of the positioning piece; both positioning pieces are inserted into the front shell guide groove. The sliding rod is positioned and guided by two positioning plates inserted into the front housing guide groove to prevent the sliding rod and the tongue from rotating.

[0017] With the above structure, the beneficial effects of this invention are as follows: Under the force of the compression spring, the end of the positioning card with the hook flips towards the square tongue fixing piece and inserts into one of the slots; after the dial rotates, before the dial enters the lock groove, the bottom end face of the dial first enters from one side of the arc convex shape and begins to contact the surface of the arc convex shape. By sliding the dial clockwise on the top surface of the arc convex shape and gradually squeezing the arc convex shape, the positioning card flips downward around the lock housing until the hook is pulled out of the slot before the dial enters the lock groove on one side; then the dial enters the lock groove and flips a certain distance before contacting one side surface of the lock groove. By pushing the surface of the lock groove, the square tongue fixing piece and the square tongue move forward, realizing the reverse locking; during the process from the dial entering the lock groove to the dial completely disengaging, the bottom surface of the dial is always pressed against the surface of the arc convex shape, so that the hook and the slot are also misaligned during the entire movement of the square tongue fixing piece and the square tongue. Similarly, when the dial rotates counterclockwise, the square latch fixing piece and the square latch move in opposite directions. The process is as follows: the dial slides counterclockwise on the top surface of the arc-shaped convex shape, gradually squeezing the arc-shaped convex shape. Before the dial enters the lock groove on the other side, the positioning card flips downward around the lock housing to the hook. The positioning card then flips downward around the lock housing until the hook is pulled out of the slot. Then, the dial enters the lock groove, flips a short distance, and contacts the other side surface of the lock groove. The dial pushes the surface of the lock groove, causing the square latch fixing piece and the square latch to move in opposite directions, thus unlocking the deadbolt. The top edge of the hook and both sides are chamfered. When there is a certain error in the sliding stroke of the square latch fixing piece, the chamfered surface of the hook squeezes the side surface of the slot, causing the square latch fixing piece to return to its correct position. In this structure, the hook used to lock the fixing piece flips along the thickness direction of the entire door handle lock, and the design distance between the square latch and the beveled latch assembly does not need to consider the stroke of the hook, which makes the overall length of the lock smaller and more flexible to use. Attached Figure Description

[0018] Figure 1 This is an exploded view of the present invention; Figure 2 This is a structural diagram of the rear housing; Figure 3 yes Figure 2 Enlarged view of part A in the image; Figure 4 This is a structural diagram of the front housing; Figure 5 yes Figure 4 Enlarged view of section B in the image; Figure 6 This is a diagram of the internal structure of the lock in its double deadbolt state; Figure 7 This is an internal structural diagram of the lock with the latch assembly having an automatic positioning function. Figure 8This is an internal structural diagram of the lock in the state without the latch positioning function; Figure 9 This is a diagram showing the state of the hook being engaged in the slot when the square tongue fixing piece and the positioning card are combined; Figure 10 This is a diagram showing the state of the hook being pulled out of the slot when the square tongue fixing piece and the positioning card are combined; Figure 11 It is a first-person perspective 3D image of the location card; Figure 12 It is a second-view stereoscopic image of the positioning card; Figure 13 This is a structural diagram of the tongue-and-groove assembly; Figure 14 This is a structural diagram of the tongue-and-groove assembly; Explanation of reference numerals in the attached figures: 1. Rear housing; 101. Stop post; 102. Arc-shaped bending plate; 10201. Extension plate; 2. Lock cylinder; 201. Dial; 3. Positioning card; 301. Card convex shape; 302. Hook; 303. Rotating shaft; 304. Spring positioning hole; 305. Clearance notch; 4. Square tongue; 5. Square tongue fixing piece; 501. Square tongue guide groove; 502. First slot; 503. Second slot; 504. Third slot; 505. Inner lock groove; 506. Deadbolt groove; 6. First connecting piece; 7. Lug assembly; 701. Lug; 702. Sliding rod; 703. Fixing plate; 70301. Positioning piece; 8. Front housing; 801. Front housing guide groove; 802. Rear baffle; 80201. Bending strip; 80202. Rear baffle support strip; 9. Side sealing plate; 901. Sealing plate guide sleeve; 10. Swing rod; 1001. Push column; 11. Handle spindle assembly; 12. Guide post; 13. Second connecting piece; 14. Guide sleeve; 15. Tension spring; 16. Compression spring. Detailed Implementation

[0019] The invention will now be further described with reference to the accompanying drawings.

[0020] like Figures 1 to 14As shown, a door handle lock according to the present invention includes a lock housing, a square latch 4 slidably connected inside the lock housing, a square latch fixing piece 5 fixed to the square latch 4, and a latch assembly 7 slidably connected inside the lock housing; a rocker arm 10 rotatably connected to the lock housing and a handle spindle assembly 11 for driving the rocker arm 10 to swing are provided inside the lock housing; a lock cylinder 2 is provided inside the lock housing; the dial 201 of the lock cylinder 2 rotates and drives the square latch fixing piece 5 to move; the rocker arm 10 is connected to the latch assembly 7; The square tongue fixing piece 5 is provided with a slot and a locking groove; the number of slots is at least two; the slots are arranged along the sliding direction of the square tongue 4; a positioning card 3 is rotatably connected inside the lock housing; a hook 302 and an arc-shaped convex shape 301 are provided on the surface of the positioning card 3; the height of the arc-shaped convex shape 301 first increases and then decreases along the swing direction of the dial 201; a compression spring 16 is fixed to the bottom of the positioning card 3; the two ends of the compression spring 16 are respectively pressed against the lock housing and the positioning card 3; The handle spindle assembly 11 is not fundamentally different from the prior art. The handle spindle assembly 11 includes a square shaft sleeve rotatably connected to the lock housing and a paddle connected to the square shaft sleeve. The paddle can rotate the rocker arm 10, causing the rocker arm 10 to push the tongue assembly 7 to retract. The square tongue fixing piece 5 and the positioning card 3 are distributed in the thickness direction of the lock; the structure of the lock cylinder 2 and the dial 201 on the dial 201 is not fundamentally different from the prior art, so it will not be described in detail; the compression spring 16 is always in a compressed state to ensure that there is a pushing force on the positioning card 3 in the direction of the square tongue fixing piece 5. Under the force of the compression spring 16, the end of the positioning card 3 with the hook 302 flips towards the square tongue fixing piece 5 and inserts into one of the slots. After the dial wheel 201 rotates, before it enters the locking groove, the bottom end face of the dial wheel 201 first contacts the surface of the arc-shaped convex shape 301, which enters from one side. The dial wheel 201 slides clockwise on the top surface of the arc-shaped convex shape 301, gradually pressing it, so that before the dial wheel 201 enters the locking groove on one side... Positioning card 3 flips downward around the lock housing until hook 302 is pulled out of the slot; then dial 201 enters the lock slot, flips a distance, and contacts one side surface of the lock slot. Dial 201 pushes the surface of the lock slot, causing square tongue fixing piece 5 and square tongue 4 to move forward, thus achieving reverse locking; during the process from dial 201 entering the lock slot to dial 201 completely disengaging, the bottom surface of dial 201 is pressed against the surface of the arc convex shape 301, so that during the entire movement of square tongue fixing piece 5 and square tongue 4, hook 302 is also misaligned with the slot. Similarly, when the dial 201 moves counterclockwise, the square tongue fixing piece 5 and the square tongue 4 will move in opposite directions. The process is as follows: the dial 201 slides counterclockwise on the top surface of the arc convex shape 301, and first gradually squeezes the arc convex shape 301, so that before the dial 201 enters the lock groove on the other side, the positioning card 3 flips down around the lock housing to the hook 302, and the positioning card 3 flips down around the lock housing to the hook 302 and is pulled out of the slot; then the dial 201 enters the lock groove and flips a short distance before contacting the other side surface of the lock groove. The dial 201 pushes the surface of the lock groove, causing the square tongue fixing piece 5 and the square tongue 4 to move in opposite directions, thereby unlocking the deadbolt. The top edge of the hook 302 and both sides are provided with chamfered surfaces. When there is a certain error in the sliding stroke of the square tongue fixing piece 5, the chamfered surface of the hook 302 presses the side surface of the slot, so that the square tongue fixing piece 5 is corrected.

[0021] In this structure, the hook 302 used to lock the fixing piece 5 flips along the thickness direction of the entire door handle lock, and the design distance between the square tongue 4 and the oblique tongue assembly 7 does not need to take into account the stroke of the hook 302, which makes the length of the entire lock smaller and more flexible to use.

[0022] In a preferred embodiment of the present invention, a rotating shaft 303 is provided at the end of the positioning card 3 away from the hook 302; the rotating shaft 303 is rotatably connected to the lock housing; an avoidance notch 305 is provided on the positioning card 3; and the lock cylinder 2 is inserted into the avoidance notch 305. The pivot point for flipping is the rotation shaft 303 away from the hook 302, which can be achieved with a small amount of pressing space, making the overall structure of the handle lock thinner; the avoidance notch 305 makes the distance between the rotation shaft 303 and the hook 302 larger, so that the hook 302 can swing significantly when flipped at a small angle; the stroke of the dial 201 pushing the arc convex shape 301 can be made smaller.

[0023] In a preferred embodiment of the present invention, the rotating shaft 303 is a cylindrical structure formed by rolling the edges of the positioning card 3; there are two rotating shafts 303; the rotating shafts 303 are respectively disposed on both sides of the positioning card 3; the lock housing is composed of a rear housing 1, a front housing 8, and a side sealing plate 9; a sealing plate guide sleeve 901 that is slidably connected to the square tongue 4 is provided on the inner wall of the side sealing plate 9; the rear housing 1 is provided with an arc-shaped bending plate 102 with an opening away from the front housing 8; the inner radius of the arc-shaped bending plate 102 is equal to the outer radius of the cylindrical structure; the rotating shafts 303 are respectively inserted into the arc-shaped bending plates 102 on both sides; an extension plate 10201 is provided at the end of the arc-shaped bending plate 102; A rear baffle 802 is provided on the front housing 8; a rear baffle support strip 80202 is provided on the rear baffle 802; the rear baffle support strip 80202 abuts against the side of the extension plate 10201 facing away from the rotating shaft 303; a bent strip 80201 is provided on the rear baffle 802 and riveted to the outer surface of the rear housing 1. The card protrusion 301, the hook 302, and the rotating shaft 303 are integrally stamped; the rear baffle 802 and the rear support strip 80202 are integrally stamped; the arc-shaped bending plate 102 and the extension plate 10201 are integrally stamped. The front housing 8 and the rear housing 1 are secured together by multiple bolts; During the assembly of the positioning card 3, one end of the compression spring 16 is first welded and fixed into the spring positioning hole 304; after the rotating shafts 303 on both sides are pre-positioned into the arc-shaped bending plates 102 on the left and right sides respectively, the front housing 8 is assembled with the rear housing 1; the rear support strip 80202 is attached to the extension plate 10201 to reduce the risk of deformation of the arc-shaped bending plate 102 due to the pushing force of the positioning card 3, and to prevent the rotating shaft 303 from detaching from the arc-shaped bending plate 102; and After the front housing 8 and the rear housing 1 are assembled, the bending strip 80201 extends to the outside of the entire lock housing. Then, the bending strip 80201 is bent with a tool and riveted to the rear housing 1. The bending strip 80201 is riveted to the rear housing 1 to enhance the strength of the rear baffle 802, reduce the risk of deformation of the rear baffle 802, and reduce the risk of the rotating shaft 303 loosening on the arc-shaped bending plate 102. In practical applications, lubricating oil is applied to the outer surface of the rotating shaft 303.

[0024] In a preferred embodiment of the present invention, the latch assembly 7 includes a guide sleeve 14 fixed to the lock housing, a sliding rod 702 slidably connected within the guide sleeve 14, a tension spring 15 sleeved outside the sliding rod 702, and a latch 701 fixed to the sliding rod 702; two fixing plates 703 are fixed to the sliding rod 702; a sliding groove is formed between the two fixing plates 703; a push column 1001 slidably connected to the sliding groove is fixed to the rocker arm 10; and the two ends of the tension spring 15 are respectively fixed to the guide sleeve 14 and the sliding rod 702. The tension spring 15 is always in a stretched state, so that the sliding rod 702 has a pulling force in the direction of the inclined tongue 701; The lock housing is provided with a through hole that is slidably connected to the latch 701; after the handle on the handle spindle assembly 11 is rotated, the handle lever of the handle spindle assembly 11 drives the rocker arm 10 to swing, and the pusher 1001 pushes the fixing plate 703 to move away from the latch 701, so that the latch 701 is retracted into the through hole; after the force of the handle is removed, the torsion spring on the handle spindle assembly 11 drives the handle lever to reset, so that the rocker arm 10 is reset, and at the same time the tension of the tension spring 15 pushes the latch 701 outward through the sliding rod 702, so as to reset the latch 701.

[0025] In a preferred embodiment of the present invention, there are three slots; there are two locking slots; the three slots are a first slot 502, a second slot 503, and a third slot 504 arranged sequentially away from the square tongue 4; the two locking slots are an inner locking slot 505 and a reverse locking slot 506 arranged sequentially away from the square tongue 4; a folding rod is connected between the rocker arm 10 and the tongue fixing piece 5; when the hook 302 is facing the third slot 504, the folding rod exerts a pulling force on the rocker arm 10 towards the square tongue 4; when the hook 302 is facing the second slot 503, the folding rod is folded and does not exert a pulling force on the rocker arm 10; when the hook 302 is facing the first slot 502 and the tongue assembly 7 is fully retracted into the lock housing, the folding rod exerts a pulling force on the rocker arm 10 away from the square tongue 4. As shown in Figure 6, when the hook 302 is aligned with and engaged in the third slot 504, the folding rod is straightened, and the square tongue fixing piece 5 exerts a pulling force on the swing rod 10 towards the side sealing plate 9 through the folding rod; this prevents the oblique tongue assembly 7 from retracting into the lock housing, thus achieving a double anti-locking effect.

[0026] For example, 6 to Figure 7As shown, the dial 201 moves clockwise and extends into the deadbolt groove 506, pushing the left wall of the deadbolt groove 506, causing the square tongue 4 and the square tongue fixing piece 5 to move one stroke into the lock housing until the hook 302 is aligned and engages with the second slot 503; in this state, after the square tongue 4 is retracted, it does not deadbolt the door frame, the folding rod can be folded, so the latch assembly 7 can extend and retract freely; this state is unlocked, but the latch assembly 7 can extend and retract freely, only the latch assembly 7 has an automatic positioning function.

[0027] like Figures 7 to 8 As shown, the dial 201 continues to move clockwise into the inner lock groove 505, pushing the left wall of the inner lock groove 505, causing the square tongue 4 and the square tongue fixing piece 5 to move further into the lock housing until the latch 302 is aligned and engaged in the first slot 502; in actual operation, operating the key causes the dial 201 to rotate clockwise, the square tongue fixing piece 5 moves into the lock housing, and combined with the operator rotating the handle, the latch assembly 7 retracts to its maximum value; in this state, the latch 302 is aligned with the first slot 502, and the latch assembly 7 is fully retracted into the lock housing; in the latch 302 After being inserted into the first slot 502, the square tongue fixing piece 5 and the square tongue 4 are locked, the folding rod is straightened again, and the square tongue fixing piece 5 exerts a pulling force on the swing rod 10 away from the side sealing plate 9 through the folding rod; in the taut state, the folding rod pulls the latch assembly 7 to position, and the latch assembly 7 and the square tongue 4 retract together into the interior of the lock housing; due to the pulling force of the folding rod on the latch assembly 7 into the interior of the lock housing, the latch assembly 7 is completely retracted into the interior of the lock housing and cannot pop out; the door will not automatically position when opening and closing, avoiding accidental positioning after the door is blown by the wind, thus realizing the latchless positioning function.

[0028] Similarly, when the dial 201 moves counterclockwise, it extends into the inner locking groove 505 and pushes the right wall of the inner locking groove 505; it extends into the anti-locking groove 506 and pushes the right wall of the anti-locking groove 506. The connection between the square tongue fixing piece 5 and the rocker arm 10 is a foldable folding rod structure, which makes the lock cylinder 2 and the handle spindle assembly 11 more compact. Moreover, through the connection structure of the folding rod, the lock can achieve a double anti-locking effect, and switch between three states: automatic positioning function only and positioning function without tongue. While ensuring the compactness of the lock, it also enriches the functionality of the lock.

[0029] In a preferred embodiment of the present invention, the folding rod is composed of a second connecting piece 13 with one end hinged to the square tongue fixing piece 5 and a first connecting piece 6 with one end hinged to the swing rod 10; the other end of the second connecting piece 13 and the other end of the second connecting piece 13 and the first connecting piece 6 are hinged together; the folding rod adopts a link structure composed of two connecting pieces, which is simple in structure and easy to process.

[0030] The length of the first connecting piece 6 and the difference in length are determined based on the stroke of the tongue assembly 7 and the distance between adjacent slots.

[0031] In a preferred embodiment of the present invention, a stop post 101 is fixed on the lock housing; the stop post 101 is disposed on the swing path of the second connecting piece 13; the stop post 101 is disposed on the side of the second connecting piece 13 away from the hook 302; Since the second connecting piece 13 and the first connecting piece 6 are taut and aligned in a straight line when the latch is not positioned, the lever 10 resets under the torque of the torsion spring of the handle spindle assembly 11. Therefore, the lever 10 prioritizes resetting the latch assembly 7 to extend outside the lock housing, while the dial 201 pushes the square tongue fixing piece 5, which only moves the hook 302 from the third slot 504 to face the second slot 503. Therefore, the angle formed between the second connecting piece 13 and the first connecting piece 6 always faces the side closer to the side sealing plate 9 to prevent the folding lever from jamming the square tongue fixing piece 5 when resetting to the double deadbolt state. Since the travel distance of the square tongue fixing piece 5 is consistent each time it is moved by the dial 201, but the extension travel distance of the oblique tongue assembly 7 is not equal to that of the square tongue fixing piece 5 each time it is moved by the dial 201, in the double-locked state, it is necessary to set the first connecting piece 6 and the second connecting piece 13 to be on different straight lines. By setting the stop post 101, in the double-locked state, the "V" shaped opening formed by the first connecting piece 6 and the second connecting piece 13 always faces one side of the square tongue 4, and the angle formed between the length direction of the second connecting piece 13 and the sliding direction of the square tongue fixing piece 5 will not exceed 90 degrees, so as to prevent the folding rod from jamming the square tongue fixing piece 5.

[0032] In a preferred embodiment of the present invention, a sealing plate guide sleeve 901 matching the square tongue 4 is fixed inside the lock housing; the square tongue 4 is inserted into the sealing plate guide sleeve 901; a guide post 12 is fixed inside the lock housing; a square tongue guide groove 501 slidably connected to the guide post 12 is provided on the square tongue fixing piece 5; the square tongue guide groove 501 extends along the length direction of the sealing plate guide sleeve 901; The square tongue fixing piece 5 slides within the square tongue guide groove 501 via the guide post 12, and the square tongue 4 slides more precisely under the guidance of the sealing plate guide sleeve 901.

[0033] In a preferred embodiment of the present invention, the fixing plate 703 is provided with a positioning piece 70301; the lock housing is provided with a front housing guide groove 801; the width of the front housing guide groove 801 is equal to the width of the positioning piece 70301; both positioning pieces 70301 are inserted into the front housing guide groove 801. The sliding rod 702 is inserted into the front housing guide groove 801 for positioning and guidance through two positioning pieces 70301, preventing the sliding rod 702 and the tongue 701 from rotating.

[0034] 1. Optimized spatial layout makes the lock lighter and more compact overall. The positioning card and square tongue fixing plate are distributed along the thickness direction. The flipping action of the hook does not affect the spacing between the square tongue and the beveled tongue components. Combined with the structural design of the positioning card, the internal installation space is greatly reduced.

[0035] 2. The square tongue is positioned stably, moves smoothly and can self-correct. The compression spring ensures stable engagement of the hook. Before the dial drive, the hook and the slot are misaligned in advance, and there is no contact throughout the process to prevent jamming.

[0036] 3. The structure is stable, easy to assemble, and has strong resistance to deformation and loosening. The rotating shaft is connected with the arc-shaped bending plate, which is simple in structure. The back support strip and bending strip enhance the structural strength. Key components are integrally stamped and formed, and the lock shell is double-fixed to extend the service life of the lock.

[0037] 4. The lock has a variety of functions and can be precisely switched. Relying on the multi-slot and folding rod structure, it can switch between three states: double deadbolt, automatic positioning with only the latch, and positioning without the latch, to meet the needs of different usage scenarios.

[0038] 5. The folding rod features a clever design, with a chain-link structure that is easy to process and allows for a more compact internal layout. The stop post restricts its swing direction and prevents jamming. The square tongue fixing plate has a length that precisely matches the stroke, ensuring smooth and interference-free state switching.

[0039] The above description is only a preferred embodiment of the present invention. Therefore, all equivalent changes or modifications made to the structure, features and principles described in the claims of this patent application are included in the scope of this patent application.

Claims

1. A door handle lock, comprising a lock housing, a square latch (4) slidably connected inside the lock housing, a square latch fixing piece (5) fixed on the square latch (4), and a latch assembly (7) slidably connected inside the lock housing; the lock housing is provided with a rocker arm (10) rotatably connected to the lock housing and a handle spindle assembly (11) for driving the rocker arm (10) to swing; the lock housing is provided with a lock cylinder (2); the dial (201) of the lock cylinder (2) rotates and drives the square latch fixing piece (5) to move; the rocker arm (10) is connected to the latch assembly (7); Its features are: The square tongue fixing piece (5) is provided with a slot and a lock slot; the number of slots is at least two; the slots are arranged along the sliding direction of the square tongue (4); the lock housing is rotatably connected to a positioning card (3); the surface of the positioning card (3) is provided with a hook (302) and an arc convex shape (301); the height of the arc convex shape (301) increases first and then decreases along the swing direction of the dial (201); a compression spring (16) is fixed at the bottom of the positioning card (3); the two ends of the compression spring (16) are respectively pressed against the lock housing and the positioning card (3).

2. A door handle lock according to claim 1, characterized in that: The positioning card (3) has a rotating shaft (303) at one end away from the hook (302); the rotating shaft (303) is rotatably connected to the lock housing; the positioning card (3) has an avoidance notch (305); the lock cylinder (2) is inserted into the avoidance notch (305).

3. A door handle lock according to claim 2, characterized in that: The rotating shaft (303) is a cylindrical structure formed by rolling the edge of the positioning card (3); there are two rotating shafts (303); the rotating shafts (303) are respectively arranged on both sides of the positioning card (3); the lock housing is composed of a rear housing (1), a front housing (8) and a side sealing plate (9); the inner wall of the side sealing plate (9) is provided with a sealing plate guide sleeve (901) that is slidably connected to the square tongue (4); the rear housing (1) is provided with an arc-shaped bending plate (102) with an opening away from the front housing (8); the inner radius of the arc-shaped bending plate (102) is equal to the outer radius of the cylindrical structure; the rotating shafts (303) are respectively inserted into the arc-shaped bending plates (102) on both sides; the end of the arc-shaped bending plate (102) is provided with an extension plate (10201). A rear baffle (802) is provided on the front housing (8); a rear baffle support strip (80202) is provided on the rear baffle (802); the rear baffle support strip (80202) abuts against the side of the extension plate (10201) facing away from the rotating shaft (303); a bent strip (80201) is provided on the rear baffle (802) and riveted to the outer surface of the rear housing (1). The card protrusion (301), hook (302) and rotating shaft (303) are integrally stamped; the rear baffle (802) and rear support strip (80202) are integrally stamped; the arc-shaped bending plate (102) and extension plate (10201) are integrally stamped.

4. A door handle lock according to claim 1, characterized in that: The latch assembly (7) includes a guide sleeve (14) fixed on the lock housing, a sliding rod (702) slidably connected inside the guide sleeve (14), a tension spring (15) sleeved outside the sliding rod (702), and a latch (701) fixed on the sliding rod (702); two fixing plates (703) are fixed on the sliding rod (702); a sliding groove is formed between the two fixing plates (703); a push column (1001) slidably connected to the sliding groove is fixed on the rocker arm (10); the two ends of the tension spring (15) are respectively fixed on the guide sleeve (14) and the sliding rod (702).

5. A door handle lock according to claim 1, characterized in that: There are three slots; there are two locking slots; the three slots are a first slot (502), a second slot (503), and a third slot (504) arranged sequentially away from the square tongue (4); the two locking slots are an inner locking slot (505) and a reverse locking slot (506) arranged sequentially away from the square tongue (4); a folding rod is connected between the swing rod (10) and the tongue fixing piece (5); when the hook (302) is facing the third slot (504), The folding rod exerts a pulling force on the swing arm (10) toward the square tongue (4); when the hook (302) is facing the second slot (503), the folding rod is in a folded state and does not exert a pulling force on the swing arm (10); when the hook (302) is facing the first slot (502) and the oblique tongue assembly (7) is fully retracted into the lock housing, the folding rod exerts a pulling force on the swing arm (10) away from the square tongue (4).

6. A door handle lock according to claim 5, characterized in that: The folding rod consists of a second connecting piece (13) hinged at one end to the square tongue fixing piece (5) and a first connecting piece (6) hinged at one end to the swing rod (10); the other end of the second connecting piece (13) is hinged to the other end of the second connecting piece (13) and the other end of the first connecting piece (6).

7. A door handle lock according to claim 6, characterized in that: A stop post (101) is fixed on the lock housing; the stop post (101) is located on the swing path of the second connecting piece (13); the stop post (101) is located on the side of the second connecting piece (13) away from the hook (302).

8. A door handle lock according to claim 1, characterized in that: The lock housing is fixed with a sealing plate guide sleeve (901) that matches the square tongue (4); the square tongue (4) is inserted into the sealing plate guide sleeve (901); the lock housing is fixed with a guide post (12); the square tongue fixing piece (5) is provided with a square tongue guide groove (501) that is slidably connected to the guide post (12); the square tongue guide groove (501) extends along the length direction of the sealing plate guide sleeve (901).

9. A door handle lock according to claim 4, characterized in that: The fixing plate (703) is provided with a positioning piece (70301); the lock housing is provided with a front housing guide groove (801); the width of the front housing guide groove (801) is equal to the width of the positioning piece (70301); both positioning pieces (70301) are inserted into the front housing guide groove (801).

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