Prying-resistant door lock with compact structure

Abstract

A prying-resistant door lock compact in structure comprises a lock shell, a main spring bolt and a shifting block, a tail plate contained in the lock shell is fixed to the main spring bolt, a clamping groove matched with the shifting block for unlocking or locking is formed in the tail plate, the tail plate is slidably connected with a movable plate capable of sliding in the direction perpendicular to the moving direction of the main spring bolt, and the movable plate is provided with a clamping groove matched with the shifting block for unlocking or locking. The movable plate is provided with an anti-prying rod extending towards the lock shell, the lock shell is provided with an anti-prying groove for containing the anti-prying rod, an anti-prying protrusion is arranged in the middle of the anti-prying groove, and the movable plate can move from the anti-prying position where part of the clamping groove is covered to the receding position where the movable plate is separated from the clamping groove. When the movable plate is located at the anti-prying position, the anti-prying rod is flush with the anti-prying protrusion in position, the anti-prying protrusion limits the movable plate, the tail plate is unlocked outwards, and when the movable plate is located at the avoiding position, the anti-prying protrusion allows the main spring bolt to be unlocked. A first elastic piece used for keeping the movable plate at the locking position is arranged between the movable plate and the tail plate.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of locks, in particular to a compact anti-picking door lock. BACKGROUND

[0002] A lock disclosed in Chinese utility model patent CN221896419U includes a lock shell, a main lock mechanism, an inclined lock mechanism, a middle transmission mechanism and a clutch driving mechanism are arranged on the lock shell; the main lock 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 a main tongue lever head capable of driving the main tongue plate to drive the main tongue to extend and retract when oscillating is arranged at the other end; the middle transmission mechanism includes a main tongue transmission member, an inclined tongue transmission member and a handle lever member which are arranged in layers and can rotate coaxially, a transmission pin is arranged on the end face of the main tongue transmission member, a waist-shaped guide hole and a hinge-connected clutch lever block are arranged on the inclined tongue transmission member, the clutch lever block can be oscillated to a transmission position or a non-transmission position under the drive of the clutch driving mechanism, the transmission pin extends into the waist-shaped guide hole, and a first driving protrusion and a second driving protrusion are protruded on the side of the handle lever member.

[0003] In the prior art, the width of the lock shell is generally 95-110 mm, and the tail plate has a large width and size. SUMMARY

[0004] The present application aims to provide a compact anti-picking door lock with a small lock shell width.

[0005] To achieve the above advantages, the present application provides a compact anti-picking door lock, which includes a lock shell, a main lock tongue and a lever head, the main lock tongue is fixed with a tail plate accommodated in the lock shell, the tail plate is provided with a clamping groove matched with the lever head for unlocking or locking, the tail plate is slidingly connected with a movable plate which can slide along a direction perpendicular to the movement direction of the main lock tongue, the movable plate is provided with a pick-resistant lever extending towards the lock shell, the lock shell is provided with a pick-resistant groove accommodating the pick-resistant lever, a pick-resistant protrusion is arranged in the middle of the pick-resistant groove, the movable plate can be moved from a pick-resistant position covering part of the clamping groove to an avoiding position disengaging from the clamping groove, the pick-resistant lever is flush with the pick-resistant protrusion when the movable plate is in the pick-resistant position, the pick-resistant protrusion limits the movable plate and the tail plate from unlocking outwardly, the pick-resistant protrusion allows the main lock tongue to unlock when the movable plate is in the avoiding position, and a first elastic member is arranged between the movable plate and the tail plate for keeping the movable plate in a locked position.

[0006] In one embodiment of the present invention, 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 the present invention, the anti-pry protrusion extends upward with a guide portion whose cross-section gradually decreases.

[0008] In one embodiment of the present invention, when the main bolt is in the locked position, the anti-pry bar abuts against the outer side of the anti-pry protrusion, and 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.

[0009] In one embodiment of the invention, it further includes a slanted latch, a rotating member for connecting a 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 the present invention, 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 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 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 the present invention, 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, 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 the present invention, 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 member 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 invention, the width of the lock case is the width of the main bolt and the tail plate. The sum of the lock case wall thicknesses can be used to make the main bolt travel 15mm. The lock case width is 36.2mm, which is very compact. The width of the bolt depends on the bolt travel, while the width of the tail plate mainly depends on the width of the movable plate.

[0017] Furthermore, in this invention, 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 the present invention.

[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, anti-pry 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 4A 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 the present invention to achieve the intended purpose, the following detailed description of the specific implementation methods, structures, features and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided below.

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

[0029] Please see Figures 1-9 A compact anti-pry door lock according to a first embodiment of the present invention includes a lock housing 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 housing 1. The tail plate 31 has a slot 30 for unlocking or locking in cooperation with the lever 2. The tail plate 31 is slidably connected to a movable plate 32 that can slide along a direction perpendicular to the movement direction of the main bolt 3. The movable plate 32 has an anti-pry bar 321 extending toward the lock housing 1. The lock housing 1 has an anti-pry groove 10 for accommodating the anti-pry bar 321. The anti-pry groove 10 has a central part... The anti-pry protrusion 101 allows the movable plate 32 to move from the anti-pry position of the covered portion of the slot 30 to a clearance position away 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 outwards. When the movable plate 32 is in the clearance 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 invention, 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 invention and are not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. 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 invention. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

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 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 a pickproofing rod which extends towards the lock shell, the lock shell is provided with a pickproofing groove which accommodates the pickproofing rod, the middle part of the pickproofing groove is provided with a pickproofing protrusion, the movable plate can move from a pickproofing position which covers the clamping groove to an avoiding position which is separated from the clamping groove, when the movable plate is in the pickproofing position, the pickproofing rod is flush with the pickproofing protrusion, the pickproofing protrusion limits the movable plate and the tail plate from being unlocked, when the movable plate is in the avoiding position, the pickproofing protrusion allows the main lock tongue to be unlocked, a first elastic member is arranged between the movable plate and the tail plate to keep the movable plate in the locked position.

2. A compact structure pick-proof door lock according to claim 1, characterized in that, The movable plate is provided with a first strip-shaped hole and a second strip-shaped hole, the tail plate is fixed with a first guide column and a second guide column which are 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 column is located above the second guide column on the outer side, the first guide column and the second guide column respectively abut against the upper end of the first strip-shaped hole and the second strip-shaped hole when the movable plate is in the pickproofing position, the first guide column and the second guide column respectively abut against the lower end of the first strip-shaped hole and the second strip-shaped hole when the movable plate is in the avoiding position, the outer side of the tail plate is provided with a torsion spring mounting column which is located below the first strip-shaped hole, and the first elastic member is a torsion spring which is sleeved outside the second guide column, one end of the torsion spring abuts against the first guide column, and the other end abuts against the torsion spring mounting column.

3. A compact structure pick-proof door lock according to claim 2, characterized in that, The pickproofing protrusion is upwardly extended with a guide portion which gradually reduces in cross section, the inner side of the upper end of the guide portion is provided with a check blocking portion, and when the movable plate slightly slides, the pickproofing rod extrudes the main lock tongue after being separated from the pickproofing protrusion, so as to drive the pickproofing rod to slide along the guide portion until abutting against the check blocking portion.

4. A compact, pick-resistant door lock according to claim 3, characterized in that When the main lock tongue is in the locked position, the pickproofing rod abuts against the outer side of the pickproofing protrusion, and when the main lock tongue is in the unlocked position, the pickproofing rod abuts against the inner side of the pickproofing protrusion to prevent the main lock tongue from leaking out of the lock shell.

5. A compact, pick-resistant door lock according to claim 4, wherein Further comprising an oblique lock tongue, a rotating member for connecting a handle for driving the oblique lock tongue to be unlocked, and a second elastic member for keeping the oblique lock tongue to be extended out of the lock shell.

6. A compact, pick-resistant door lock according to claim 5, wherein, Further comprising a transmission plate which is provided with a guide window, the tail plate is provided with a third guide column on the side which faces away from the movable plate and is accommodated in the guide window, the rotating member is provided with a transmission protrusion which cooperates with the transmission plate, the two ends of the transmission plate are respectively bent to form an upper top rod and a lower top rod which cooperate with the transmission protrusion and the knob, the middle part of the transmission plate is provided with a third strip-shaped hole, the lock shell is provided with a fourth guide column which is accommodated in the third strip-shaped hole, when the main lock tongue is locked, the third guide column abuts against the outer side of the guide window, the lower top rod is separated from the knob, and the transmission plate can be freely moved downwards, when the main lock tongue is in the unlocked state, the third guide column abuts against the inner side of the guide window, and the knob can extrude the lower top rod to drive the rotating member to rotate and drive the oblique lock tongue to be unlocked.

7. A compact structure pick-proof door lock according to claim 6, characterized in that, The tail plate is provided with a backing plate on the side opposite to the movable plate, the third guide column is formed by bending the backing plate, the surface of the backing plate is parallel to the surface of the main locking tongue, and the first guide column and the second guide column are riveted and fixed through the tail plate and the backing plate.

8. A compact structure pick-proof door lock according to claim 7, characterized in that, The lock shell is provided with a fifth slot-shaped hole for accommodating the second guide column.

9. A compact structure pick-proof door lock according to claim 8, characterized in that, The lock shell is provided with a sixth slot-shaped hole for accommodating the fourth guide column.

10. A compact, pick-resistant door lock according to claim 8, wherein, The upper part of the transmission plate is provided with a friction protrusion extending towards the lock shell, and the friction protrusion is in contact with the lock shell during the process that the transmission plate drives the rotating piece to rotate and drives the bevel locking tongue to be unlocked.

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