A compact pick-resistant door lock

Abstract

A compact structure anti-picking door lock, comprising a lock housing, a main lock tongue, a knob, a tail plate fixed with the main lock tongue and accommodated in the lock housing, the tail plate is provided with a clamping groove matched with the knob for unlocking or locking, the tail plate is slidably connected with a movable plate which can slide along a direction perpendicular to the moving direction of the main lock tongue, the movable plate is provided with an anti-picking rod extending towards the lock housing, the lock housing is provided with an anti-picking groove accommodating the anti-picking rod, the anti-picking groove is provided with an anti-picking protrusion in the middle, the movable plate can move from an anti-picking position covering the clamping groove to an avoiding position disengaging from the clamping groove, the anti-picking rod is flush with the anti-picking protrusion when the movable plate is in the anti-picking position, the anti-picking protrusion limits the movable plate and the tail plate from unlocking outward, the anti-picking protrusion allows the main lock tongue to unlock when the movable plate is in the avoiding position, a first elastic member is arranged between the movable plate and the tail plate for keeping the movable plate in the locking position.

Description

Technical Field

[0001] This utility model relates to the field of lock technology, and in particular to a compact anti-pry door lock. Background Technology

[0002] Chinese utility model patent CN221896419U discloses a lock, including a lock shell, a main locking mechanism, a slanted locking mechanism, a central transmission mechanism, and a clutch drive mechanism. The main locking mechanism includes a main tongue, a main tongue plate, and a lock tongue lever. The main tongue plate is fixedly connected to the inner side of the main tongue, and the other end is provided with a main tongue lever head that can drive the main tongue plate to extend and retract the main tongue when swinging. The central transmission mechanism includes a main tongue transmission component, a slanted tongue transmission component, and a handle actuating component that are stacked and can rotate coaxially. A transmission pin extends from the end face of the main tongue transmission component. The slanted tongue transmission component is provided with a waist-shaped guide hole and a clutch lever block that is hinged thereto. The clutch lever block can swing to a transmission position or a non-transmission position under the drive of the clutch drive mechanism. The transmission pin extends into the waist-shaped guide hole. The circumference of the handle actuating component is provided with a first driving protrusion and a second driving protrusion.

[0003] In the existing technology, the width of the lock case is generally 95-110mm, and the tailplate is wide and large in size. Utility Model Content

[0004] The purpose of this utility model is to provide a compact anti-pry door lock with a small lock case width.

[0005] To achieve the above advantages, this utility model provides a compact anti-pry door lock, including a lock shell, a main bolt, and a lever. The main bolt is fixed with a tail plate housed within the lock shell. The tail plate has a slot for unlocking or locking in conjunction with the lever. The tail plate is slidably connected to a movable plate that can slide along a direction perpendicular to the movement of the main bolt. The movable plate has an anti-pry bar extending toward the lock shell. The lock shell has an anti-pry groove for accommodating the anti-pry bar. An anti-pry protrusion is provided in the center of the anti-pry groove. The movable plate can move from an anti-pry position covering part of the slot to a clearance position away from the slot. When the movable plate is in the anti-pry position, the anti-pry bar is flush with the anti-pry protrusion. The anti-pry protrusion restricts the movable plate and the tail plate from unlocking outwards. When the movable plate is in the clearance position, the anti-pry protrusion allows the main bolt to unlock. A first elastic element is provided between the movable plate and the tail plate to keep the movable plate in the locked position.

[0006] In one embodiment of this utility model, the movable plate has a first strip-shaped hole and a second strip-shaped hole, and the tail plate is fixed with a first guide post and a second guide post respectively accommodated in the strip-shaped hole. The first strip-shaped hole and the second strip-shaped hole are arranged in parallel, and the first guide post is located above and outside the second guide post. In the anti-pry position, the first guide post and the second guide post abut against the upper end of the first strip-shaped hole and the second strip-shaped hole respectively. In the avoidance position, the first guide post and the second guide post abut against the lower end of the first strip-shaped hole and the second strip-shaped hole respectively. A torsion spring mounting post is provided on the outer side of the tail plate below the first strip-shaped hole. The first elastic element is a torsion spring sleeved outside the second guide post. One end of the torsion spring abuts against the first guide post, and the other end abuts against the torsion spring mounting post.

[0007] In one embodiment of this utility model, the anti-pry protrusion extends upward with a guide portion whose cross-section gradually decreases.

[0008] In one embodiment of this utility model, when the main lock tongue is in the locked position, the anti-pry bar abuts against the outer side of the anti-pry protrusion; when the main lock tongue is in the unlocked position, the anti-pry bar abuts against the inner side of the anti-pry protrusion to prevent the main lock tongue from protruding from the lock housing.

[0009] In one embodiment of the present invention, it further includes a slanted latch, a rotating member for connecting the handle for driving the slanted latch to unlock, and a second elastic member for keeping the slanted latch extended out of the lock housing.

[0010] In one embodiment of this utility model, a transmission plate with a guide window is further included. The side of the tail plate facing away from the movable plate is provided with a third guide post that is accommodated in the guide window. The rotating member is provided with a transmission protrusion that cooperates with the transmission plate. The two ends of the transmission plate are respectively bent to form an upper push rod and a lower push rod that cooperate with the transmission protrusion and the dial. The transmission plate is provided with a third strip-shaped hole in the middle. The lock housing is provided with a fourth guide post that is accommodated in the third strip-shaped hole. When the main lock tongue is locked, the third guide post abuts against the outside of the guide window, the lower push rod disengages from the dial, and the transmission plate can move freely downward. When the main lock tongue is in the unlocked state, the third guide post abuts against the inside of the guide window, and the dial can squeeze the lower push rod to drive the rotating member to rotate and drive the oblique lock tongue to unlock.

[0011] In one embodiment of this utility model, a pad is provided on the side of the tail plate facing away from the movable plate, and the third guide post is formed by bending the pad, with the surface of the pad being parallel to the surface of the main locking tongue.

[0012] In one embodiment of the present invention, the lock housing has a fifth strip-shaped hole for accommodating the second guide post.

[0013] In one embodiment of the present invention, the lock housing has a sixth strip-shaped hole for accommodating the fourth guide post.

[0014] In one embodiment of this utility model, the upper part of the transmission plate is provided with friction protrusions extending toward the lock housing. These friction protrusions contact the lock housing during the process in which the transmission plate drives the rotating component to rotate and drive the oblique locking tongue to unlock. This prevents excessive friction between the burrs on the transmission plate and the lock body.

[0015] With the cooperation of the anti-pry bar and the anti-pry protrusion, the movement of the main bolt in the locked state is restricted by the anti-pry protrusion.

[0016] In this utility model, the width of the lock case is the width of the main bolt and the tail plate. The sum of the lock case wall thickness can be used to make the main bolt stroke 15mm. The lock case width is 36.2mm, which is very compact. The width of the bolt depends on the bolt stroke, while the width of the tail plate mainly depends on the width of the movable plate.

[0017] Furthermore, in this utility model, the main bolt, tail plate, movable plate, pad, first elastic element, first guide post, and second guide post can be pre-assembled, which facilitates the assembly of the entire lock. Attached Figure Description

[0018] Figure 1 The diagram shown is a structural schematic of a compact anti-pry door lock according to the first embodiment of this utility model.

[0019] Figure 2 As shown Figure 1 A structural diagram of a compact, tamper-evident door lock from another direction.

[0020] Figure 3 As shown Figure 1 An exploded view of a compact, tamper-proof door lock.

[0021] Figure 4 As shown Figure 3 A structural diagram of the tailplate, movable plate, and pad plate.

[0022] Figure 5 As shown Figure 3 A schematic diagram of the transmission plate.

[0023] Figure 6 As shown Figure 2 A schematic diagram of the hidden part of the lock body of a compact, tamper-proof door lock.

[0024] Figure 7 As shown Figure 6 A schematic diagram of the locked state of a compact, tamper-proof door lock.

[0025] Figure 8 As shown Figure 4 A schematic diagram of the main bolt, movable plate, and torsion spring of a compact anti-pry door lock.

[0026] Figure 9 As shown Figure 1 A magnified view of a portion at point A. Detailed Implementation

[0027] To further illustrate the technical means and effects adopted by this utility model in order to achieve the intended utility model purpose, the following detailed description of the specific implementation methods, structures, features and effects of this utility model is provided in conjunction with the accompanying drawings and preferred embodiments.

[0028] In this application, the unlocking direction is outward and the unlocking direction is inward.

[0029] Please see Figure 1-9 The first embodiment of this utility model provides a compact anti-pry door lock, including a lock shell 1, a main bolt 3, and a lever 2. The main bolt 3 is fixedly fitted with a tail plate 31 housed within the lock shell 1. The tail plate 31 has a slot 30 that engages with the lever 2 for unlocking or locking. The tail plate 31 is slidably connected to a movable plate 32 that can slide along a direction perpendicular to the movement of the main bolt 3. The movable plate 32 has an anti-pry bar 321 extending toward the lock shell 1. The lock shell 1 has an anti-pry groove 10 for accommodating the anti-pry bar 321. The anti-pry groove 10 has a central part... There is an anti-pry protrusion 101. The movable plate 32 can move from the anti-pry position of the covered portion of the slot 30 to the avoidance position of disengaging from the slot 30. When the movable plate 32 is in the anti-pry position, the anti-pry bar 321 is flush with the anti-pry protrusion 101. The anti-pry protrusion 101 restricts the movable plate 32 and the tail plate 31 from unlocking outward. When the movable plate 32 is in the avoidance position, the anti-pry protrusion 101 allows the main lock tongue 3 to unlock. A first elastic element 3t is provided between the movable plate 32 and the tail plate 31 to keep the movable plate 32 in the locked position.

[0030] The movable plate 32 has a first strip hole 3201 and a second strip hole 3202. The tail plate 31 is fixed with a first guide post 311 and a second guide post 312 respectively accommodated in the strip holes. The first strip hole 3201 and the second strip hole 3202 are arranged in parallel, and the first guide post 311 is located above and outside the second guide post 312. In the anti-pry position, the first guide post 311 and the second guide post 312 abut against the upper end of the first strip hole 3201 and the second strip hole 3202 respectively. In the avoidance position, the first guide post 311 and the second guide post 312 abut against the lower end of the first strip hole 3201 and the second strip hole 3202 respectively. The tail plate 31 has a torsion spring mounting post 313 located below the first strip hole 3201 on the outside. The first elastic element 3t is a torsion spring sleeved outside the second guide post 312. One end of the torsion spring abuts against the first guide post 311, and the other end abuts against the torsion spring mounting post 313.

[0031] The anti-pry protrusion 101 extends upwards to a guide portion 102 with a gradually decreasing cross-section. A check valve 1021 is provided on the inner side of the upper end of the guide portion 102. When the sliding plate slides slightly, the anti-pry bar 321 disengages from the anti-pry protrusion 101 and presses against the main locking tongue 3, driving the anti-pry bar to slide along the guide portion 102 until it abuts against the check valve 1021. A large rotation of the dial 2 drives the movable plate 32 to a clearance position, where the check valve 1021 can no longer block the movement. When the main bolt 3 is in the locked position, the anti-pry bar 321 abuts against the outside of the anti-pry protrusion 101. When the main bolt 3 is in the unlocked position, the anti-pry bar 321 abuts against the inside of the anti-pry protrusion 101 to prevent the main bolt 3 from protruding from the lock housing 1.

[0032] It also includes a slanted latch 4, a rotating part 5 for connecting the handle to drive the slanted latch 4 to unlock, and a second elastic part 4t for keeping the slanted latch 4 extended out of the lock case 1.

[0033] It also includes a transmission plate 6 with a guide window 60. The tail plate 31 has a third guide post 71 that is accommodated in the guide window 60 on the side facing away from the movable plate 32. The rotating part 5 has a transmission protrusion 51 that cooperates with the transmission plate 6. The two ends of the transmission plate 6 are bent to form an upper push rod 61 and a lower push rod 62 that cooperate with the transmission protrusion 51 and the dial 2, respectively. The transmission plate 6 has a third strip hole 630 in the middle. The lock shell 1 has a fourth guide post 13 that is accommodated in the third strip hole 630. When the main lock tongue 3 is locked, the third guide post 71 abuts against the outside of the guide window 60, the lower push rod 62 disengages from the dial 2, and the transmission plate 6 can move downward freely. When the main lock tongue 3 is in the unlocked state, the third guide post 71 abuts against the inside of the guide window 60, and the dial 2 can squeeze the lower push rod 62 to drive the rotating part 5 to rotate and drive the oblique lock tongue 4 to unlock.

[0034] The tail plate 31 has a pad 7 on the side facing away from the movable plate 32. The third guide post 71 is formed by bending the pad 7. The surface of the pad 7 is parallel to the surface of the main locking tongue 3.

[0035] The lock housing 1 has a fifth strip hole 140 for accommodating the second guide post 312.

[0036] The lock housing 1 has a sixth slot 150 for accommodating the fourth guide post 13.

[0037] The upper part of the transmission plate 6 is provided with friction protrusions 63 extending toward the lock housing 1. The friction protrusions 63 come into contact with the lock housing 1 during the process of the transmission plate 6 driving the rotating component 5 to rotate and drive the oblique locking tongue 4 to unlock. This prevents excessive friction between the burrs of the transmission plate 6 and the lock body.

[0038] With the cooperation of the anti-pry bar 321 and the anti-pry protrusion 101, the movement of the main bolt 3 in the locked state is restricted by the anti-pry protrusion 101.

[0039] In this utility model, the width of the lock case 1 is the width of the main bolt 3 and the tail plate 31. The sum of the wall thickness of the lock case 1 can make the main bolt 3 travel 15mm. The width of the lock case 1 is 36.2mm, which is very compact. The width of the bolt depends on the bolt travel, while the width of the tail plate 31 mainly depends on the width of the movable plate 32.

[0040] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to preferred embodiments, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the scope of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A compact anti-pry door lock, comprising a lock housing, a main bolt, and a locking lever, wherein the main bolt is fixedly fitted with a tail plate housed within the lock housing, and the tail plate is provided with a slot for unlocking or locking in conjunction with the locking lever, characterized in that, The tailplate is slidably connected to a movable plate that can slide along a direction perpendicular to the movement direction of the main bolt. The movable plate has an anti-pry bar extending toward the lock housing. The lock housing has an anti-pry groove for accommodating the anti-pry bar, and an anti-pry protrusion in the center of the anti-pry groove. The movable plate can move from an anti-pry position covering part of the slot to a clearance position away from the slot. When the movable plate is in the anti-pry position, the anti-pry bar is flush with the anti-pry protrusion. The anti-pry protrusion restricts the movable plate and the tailplate from unlocking outward. When the movable plate is in the clearance position, the anti-pry protrusion allows the main bolt to unlock. A first elastic element is provided between the movable plate and the tailplate to keep the movable plate in the locked position.

2. The compact anti-pry door lock according to claim 1, characterized in that, The movable plate has a first strip-shaped hole and a second strip-shaped hole. The tail plate is fixed with a first guide post and a second guide post respectively accommodated in the strip-shaped holes. The first strip-shaped hole and the second strip-shaped hole are arranged in parallel, and the first guide post is located above and outside the second guide post. In the anti-pry position, the first guide post and the second guide post abut against the upper end of the first strip-shaped hole and the second strip-shaped hole respectively. In the avoidance position, the first guide post and the second guide post abut against the lower end of the first strip-shaped hole and the second strip-shaped hole respectively. The tail plate has a torsion spring mounting post located below the first strip-shaped hole on its outer side. The first elastic element is a torsion spring sleeved outside the second guide post. One end of the torsion spring abuts against the first guide post, and the other end abuts against the torsion spring mounting post.

3. The compact anti-pry door lock according to claim 2, characterized in that, The anti-pry protrusion extends upward with a guide portion whose cross-section gradually decreases. A check-back blocking portion is provided on the inner side of the upper end of the guide portion. When the movable plate slides slightly, the anti-pry bar disengages from the anti-pry protrusion and presses the main lock tongue, which can drive the anti-pry bar to slide along the guide portion until it abuts against the check-back blocking portion.

4. The compact anti-pry door lock according to claim 3, characterized in that, When the main bolt is in the locked position, the anti-pry bar abuts against the outer side of the anti-pry protrusion; when the main bolt is in the unlocked position, the anti-pry bar abuts against the inner side of the anti-pry protrusion to prevent the main bolt from protruding from the lock housing.

5. The compact anti-pry door lock according to claim 4, characterized in that, It also includes a slanted latch, a rotating member for connecting the handle for driving the slanted latch to unlock, and a second elastic member for keeping the slanted latch extended out of the lock housing.

6. The compact anti-pry door lock according to claim 5, characterized in that, It also includes a transmission plate with a guide window. The side of the tail plate facing away from the movable plate has a third guide post that is accommodated in the guide window. The rotating component has a transmission protrusion that cooperates with the transmission plate. The two ends of the transmission plate are bent to form an upper push rod and a lower push rod that cooperate with the transmission protrusion and the dial head, respectively. The transmission plate has a third strip-shaped hole in the middle. The lock housing has a fourth guide post that is accommodated in the third strip-shaped hole. When the main lock tongue is locked, the third guide post abuts against the outside of the guide window, the lower push rod disengages from the dial head, and the transmission plate can move freely downward. When the main lock tongue is in the unlocked state, the third guide post abuts against the inside of the guide window, and the dial head can squeeze the lower push rod to drive the rotating component to rotate and drive the oblique lock tongue to unlock.

7. The compact anti-pry door lock according to claim 6, characterized in that, The tail plate has a pad on the side facing away from the movable plate. The third guide post is formed by bending the pad. The surface of the pad is parallel to the surface of the main locking tongue. The first guide post and the second guide post pass through the tail plate and are riveted to the pad.

8. The compact anti-pry door lock according to claim 7, characterized in that, The lock housing has a fifth slotted hole for accommodating the second guide post.

9. The compact anti-pry door lock according to claim 8, characterized in that, The lock housing has a sixth slotted hole for accommodating the fourth guide post.

10. The compact anti-pry door lock according to claim 8, characterized in that, The upper part of the transmission plate is provided with friction protrusions extending toward the lock housing. These friction protrusions contact the lock housing during the process in which the transmission plate drives the rotating component to rotate and drive the oblique locking tongue to unlock.

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