CN212027443U - Oblique tongue anti-insertion and anti-theft opening structure and door lock with same - Google Patents

Abstract

The utility model belongs to the technical field of the mechanical lock, concretely relates to oblique tongue prevents inserting and steals structure and has its lock, wherein the oblique tongue prevents inserting and steals the structure and includes oblique tongue subassembly, spacing subassembly, unblock subassembly and locking Assembly, and the locking Assembly has and is opening the door the state restriction the locating part removes locking state on the oblique tongue withdrawal route, and is closing the door the state does not restrict the locating part removes unlocking state on the oblique tongue withdrawal route. By arranging the locking assembly, the limiting end of the limiting piece is limited to move to the latch bolt retracting path in the door opening state, and the limiting piece is not limited to move to the latch bolt retracting path in the door closing state; that is to say, the limiting piece cannot move to the retraction path of the latch bolt when the door is opened, so that the latch bolt is in an unlocked state; when the door is closed, the limiting piece is not limited by the locking component and can move to the retraction path of the latch bolt, and the latch bolt is locked, so that the effect of preventing the insertion and the theft is achieved; meanwhile, when the door is opened, the latch bolt is unlocked and can retract or extend out of the lock shell.

Description

Oblique tongue anti-insertion and anti-theft opening structure and door lock with same

Technical Field

The utility model belongs to the technical field of the mechanical lock, concretely relates to oblique tongue prevents inserting and steals structure and has its lock.

Background

The door lock plays an important role in guaranteeing the safety of people and property indoors, and is generally divided into an electronic door lock and a mechanical door lock according to different unlocking modes, wherein the mechanical door lock is unlocked or locked through a key matched with a lock.

According to the traditional mechanical door lock, a main lock and an oblique bolt assembly are installed on the door lock, the main lock on the mechanical lock is controlled through a lock cylinder, the main lock is opened or closed through a key, the oblique bolt assembly is controlled through a handle, the oblique bolt assembly is used for positioning a door plate on a door frame, the door plate is conveniently and simply locked with the door frame, and the effect of locking is not achieved. The working process of the door lock in the general market in the practical application process is as follows: when the door is closed, the latch bolt assembly is extruded by the door frame, so that the latch bolt assembly retracts into the door lock, when the door is matched with the door frame, the position of the latch bolt is just aligned with a latch bolt hole on the door frame, and the head of the latch bolt extends into the latch bolt hole due to the biasing force of the return spring, so that the door can be in a closed state; because the latch bolt can be retracted into the door lock only by applying pressure to the latch bolt, under the condition that the door is closed but not reversely locked, the latch bolt can be pressed into the door lock by applying pressure to the latch bolt through a gap between the door and a door frame by adopting structures such as inserted objects, such as elastic insertion sheets and the like, so that the door can be abnormally opened, and potential safety hazards are brought to indoor people and property.

In order to increase the safety of the door lock, an auxiliary bolt is added to the existing door lock, and a multiple anti-theft structure is formed by adding the auxiliary bolt, but the structure needs to add bolt holes on the door frame and the door lock, which inevitably has a great influence on the structural strength of the door lock and the door frame, so that the safety performance is unstable.

Chinese patent document CN206829807U discloses a limit component for a latch bolt of an anti-theft lock body, which mainly comprises an anti-insertion piece and a push piece, wherein the tail end of the anti-insertion piece is installed on the lock body positioned at one side of the tail end of a latch bolt connecting rod through a hinge shaft, and the head end of the anti-insertion piece is arranged close to the latch bolt connecting rod and acts on the rear side of the latch bolt to push the latch bolt to move backwards; the pushing sheet is arranged on the oblique tongue connecting rod, acts on the anti-insertion sheet and enables the head end of the anti-insertion sheet to move towards the direction far away from the oblique tongue connecting rod when the oblique tongue connecting rod moves backwards. According to the technical scheme, the anti-insertion piece is arranged in the lock body, so that the anti-insertion piece acts on the rear side of the oblique tongue and butts against the oblique tongue to move backwards, and the anti-theft effect is achieved. However, the latch bolt limiting assembly with the structure still has the problem that the anti-insertion piece acts on the rear side of the latch bolt to prop against the latch bolt to move backwards, so that the effect of the anti-insertion piece on the latch bolt needs to be relieved by a handle or a key when the door needs to be closed every time, the use and the operation are troublesome, and the anti-insertion piece or the whole door lock is easily damaged when the door is violently closed.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that the current lock of overcoming among the prior art improves the theftproof performance through the anti-insertion piece in the lock body, causes the troublesome poeration of closing the door, and causes the defect of preventing the destruction of inserted sheet or lock easily to provide a simple structure, need not to increase supplementary tongue structure and also need not to relieve the effect of preventing the inserted sheet to the oblique tongue through the handle when closing the door, and the oblique tongue that the security performance is stable prevents inserting the structure of stealing, and be provided with this oblique tongue prevents inserting the lock of stealing the structure.

Therefore, the utility model provides a structure is stolen to oblique tongue anti-insertion, include:

a latch bolt assembly including a latch bolt that can extend or retract into the lock housing;

the limiting assembly comprises a limiting piece which is rotatably arranged in the lock shell and a limiting and biasing piece which provides a limiting end of the limiting piece close to the latch bolt to move towards a retraction path of the latch bolt;

the unlocking assembly is linked with the handle and arranged in the lock shell, abuts against the limiting part and rotates to enable the limiting end to move out of the inclined bolt retracting path;

further comprising:

the lock assembly is movably arranged in the lock shell and has a locking state for limiting the limiting piece to move to the latch bolt retracting path in a door opening state and an unlocking state for not limiting the limiting piece to move to the latch bolt retracting path in a door closing state.

Optionally, the locking assembly has a locking abutting end located on a retraction path of the latch bolt, and when the door is closed, the latch bolt pushes the locking abutting end to move, so that the locking assembly moves from the locking state to the unlocking state.

Optionally, the locking assembly includes a first locking member, one end of the first locking member is the locking abutting end, and the first locking member has a locking limiting end that limits the limiting member to move to the latch bolt retracting path in the locking state and does not limit the limiting member to move to the latch bolt retracting path in the unlocking state.

Optionally, in the insertion and theft prevention structure for the latch tongue, the reciprocating direction of the first locking member is parallel to the moving path of the latch tongue.

Optionally, the latch bolt anti-insertion and anti-theft opening structure is characterized in that the limiting part is provided with a limiting locking surface in a locking state and abutted against a locking limiting end, and a limiting unlocking surface in an unlocking state and abutted against a locking limiting end, wherein the distance from the limiting locking surface to a movement path of the latch bolt is smaller than the distance from the limiting unlocking surface to the movement path of the latch bolt, and the limiting locking surface is in smooth transition with the limiting unlocking surface.

Optionally, in the latch tongue anti-insert-and-tamper structure, the locking assembly further includes a first movement biasing member connected to the first locking member for providing the first locking member with a movement toward the protruding direction of the latch tongue.

Optionally, the locking assembly further includes a second locking member for locking the first locking member in the unlocked state and unlocking the first locking member in the locked state.

Optionally, the second locking piece is linked with the handle to form the oblique tongue anti-insertion and anti-theft structure.

Optionally, in the latch bolt anti-theft structure, the second locking member is movably disposed in the lock housing, and a second moving biasing member is mounted on the second locking member to deflect the second locking portion of the second locking member toward the first locking member, and the first locking member has a first locking portion disposed to cooperate with the second locking portion.

Optionally, the latch bolt anti-insertion and anti-theft structure comprises a first locking part and a second locking part, wherein the first locking part is a groove recessed towards the inner side of the first locking part, the second locking part is a protrusion protruding towards the outer side of the second locking part, the protrusion is abutted against the outer side of the groove wall of the groove in the locking state, and the protrusion extends into the groove and is abutted against the inner wall of the groove in the unlocking state.

Optionally, in the latch bolt anti-insertion and anti-theft structure, the second locking member is rotatably disposed in the lock housing, and the second moving biasing member is a torsion spring.

Optionally, the latch bolt anti-theft structure includes a second pushing portion that pushes the second locking member to move against the second moving biasing member by abutting against an unlocking portion of the second locking member.

Optionally, in the structure for preventing the latch bolt from being inserted and stolen, the second abutting portion is a protruding structure which is arranged in the extending direction of the latch bolt and protrudes towards the direction of the second locking member.

Optionally, the latch bolt anti-insertion and anti-theft structure further includes a first abutting member, which is controlled by a key to move and can abut against the second abutting portion to drive the second abutting portion to move so that the second locking member moves against the second moving biasing member.

Optionally, the latch bolt anti-insertion and anti-theft opening structure further includes a first abutting portion connected to the handle, a second abutting portion is slidably disposed on a latch bolt connecting rod of the latch bolt assembly, the first abutting portion abuts against the limiting member to rotate when pushing the second abutting portion to move, so that the limiting end moves out of the latch bolt retracting path, and the second abutting portion is disposed on the first abutting portion.

Another object of the utility model is to provide a door lock, be in including lock shell and setting oblique tongue in the lock shell prevents inserting and steals the structure, oblique tongue prevents inserting and steals the structure and be above-mentioned arbitrary one oblique tongue prevent inserting and steal the structure.

The utility model discloses technical scheme has following advantage:

1. the utility model provides an oblique tongue anti-insert and anti-theft structure, which comprises an oblique tongue component and an oblique tongue, wherein the oblique tongue component comprises an oblique tongue which can extend out of or retract into a lock shell;

the limiting assembly comprises a limiting piece which is rotatably arranged in the lock shell and a limiting and biasing piece which provides a limiting end of the limiting piece close to the latch bolt to move towards a retraction path of the latch bolt;

the unlocking assembly is linked with the handle and arranged in the lock shell, abuts against the limiting part and rotates to enable the limiting end to move out of the inclined bolt retracting path;

further comprising:

the lock assembly is movably arranged in the lock shell and has a locking state for limiting the limiting piece to move to the latch bolt retracting path in a door opening state and an unlocking state for not limiting the limiting piece to move to the latch bolt retracting path in a door closing state.

According to the oblique tongue anti-insertion and anti-theft opening structure, the locking assembly is arranged, so that the limiting end of the limiting piece is limited to move to the oblique tongue retraction path in the door opening state, and the limiting piece is not limited to move to the oblique tongue retraction path in the door closing state; that is to say, when the door is opened, the limit end of the limit piece can not move to the limit latch bolt retraction lock shell on the latch bolt retraction path under the action of the locking assembly, so that the latch bolt is unlocked; when the door is closed, the limiting end of the limiting piece is not limited by the locking component and can move to the retraction path of the latch bolt to prevent the latch bolt from retracting into the lock shell and lock the latch bolt, so that the object entering from a gap between the door and the door frame is prevented from pushing the latch bolt to enter the lock shell in the door closing state, and the effect of preventing insertion and theft is achieved; meanwhile, when the door is opened, the latch bolt is unlocked and can be freely retracted and extended out of the lock shell without a handle or a key; the structure is more reasonable.

2. The utility model provides a latch bolt is prevented inserting and is stolen structure, locking Assembly include first locking piece, the one end of first locking piece does locking butt end, it restricts at the locking state to have on the first locking piece the locating part removes on the latch bolt withdrawal path, not restrict at unblock state the locating part removes spacing end of locking on the latch bolt withdrawal path. The distance between the locking limiting end and the inner end face of the latch bolt is changed by the arrangement of the locking limiting end, so that the limiting end of the limiting assembly is limited to enter a latch bolt retraction path under the locking state of the locking assembly, and the latch bolt assembly is in an unlocking state; and in the unlocking state, the limiting end of the limiting component is not limited to enter the retraction path of the latch bolt, so that the latch bolt component is in the locking state.

3. The utility model provides a latch bolt prevents inserting and steals structure, the locking subassembly includes first locking piece and second locking piece, can realize unblock first locking piece under the lock-out condition through setting up of second locking piece, need not to add other unblock structures that are used for unblock and lock first locking piece, reduce the use of spare part, the structure is compacter, can realize locking first locking piece under the unlock-out condition simultaneously, the reliability of first locking piece when the lock-out condition has been increased.

4. The utility model provides a latch bolt prevents inserting and steals structure, locking subassembly have the locking butt end of setting on latch bolt withdrawal route, support through the latch bolt and push away locking butt end for the latch bolt subassembly is switched to the unblock state by the locking state and is accomplished the unblock, makes to have the associativity between locking subassembly and the latch bolt subassembly.

5. The door lock provided by the utility model comprises the oblique tongue anti-insert and anti-theft opening structure, so that the oblique tongue component can be locked when the door is closed, and the oblique tongue component is prevented from being pushed back into the lock shell 5 by an article entering from a door gap, thereby effectively preventing the burglary and protecting the personal and property safety; meanwhile, when the door is opened, the latch bolt assembly is in an unlocking state, the locking of the latch bolt assembly is not required to be released through a handle when the door is closed, the door is more convenient to use, and the door lock or the door frame is prevented from being damaged when the door is violently closed.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic structural view of the latch bolt anti-insertion and anti-theft structure of the present invention in a door open state (a locking assembly unlocked state);

fig. 2 is a schematic structural view of the latch bolt anti-theft opening structure of the present invention in a door-closed state (locking state of the locking assembly);

fig. 3 is a schematic structural view of the oblique-tongue anti-insertion and anti-theft structure of the present invention when unlocked by a key or a handle;

fig. 4 is a schematic top view of the latch bolt anti-theft structure of the present invention in an unlocked state of the locking assembly (the latch bolt assembly is omitted);

fig. 5 is a schematic structural view of the first locking member of the oblique tongue anti-insertion and anti-theft structure of the present invention;

fig. 6 is a schematic structural view of the latch bolt assembly of the latch bolt anti-insertion and anti-theft structure of the present invention.

Description of reference numerals:

1-a latch bolt assembly; 11-oblique tongue; 12-a latch bolt connecting rod; 13-a second return spring; 14-a third return spring; 15-a first return spring; 16-a first collar; 17-a second collar; 18-a third retainer; 19-a fourth retaining ring; 110-bumps;

2-a limiting component; 21-a limit piece; 210-a limiting end; 211-limit unlocking surface; 212-positive locking surface; 213-unlocking the boss; 22-a limit biasing member;

3-a locking assembly; 31-a first locking member; 311-locking limit end; 312-a first sliding connection; 313-a second sliding connection; 314-locking abutment end; 32-a second locking element; 321-a second locking portion; 322-unlocking part; 33-a first moving bias; 34-a second moving bias;

4-an unlocking assembly; 41-a first dial plate; 411-a second pushing part; 412-a first pushing part; 42-a second pushing piece; 43-a first pushing member;

5-a lock case;

6-fixed stop.

Detailed Description

The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Example 1

The latch bolt anti-insert and anti-theft opening structure of the embodiment is installed in a lock shell 5 as shown in fig. 1 to 6, and comprises a latch bolt component 1, a limiting component 2, an unlocking component 4 and a locking component 3, wherein the latch bolt component 1 comprises a latch bolt 11 and a latch bolt connecting rod 12 connected with the latch bolt 11, and the latch bolt 11 can extend out of or retract into the lock shell 5; the limiting assembly 2 comprises a limiting member 21 and a limiting biasing member 22, the limiting member 21 is rotatably installed in the lock case 5 and has a limiting end 210, and the limiting biasing member 22 applies a biasing force to the limiting member 21 to move towards a retraction path of the latch bolt 11 so that the limiting end 210 is located on the retraction path of the latch bolt 11; the unlocking component 4 is linked with a handle (not shown) and pushes the limiting part 21 to rotate so that the limiting end 210 of the limiting part 21 moves out of the retraction path of the latch bolt 11; the locking assembly 3 is movably disposed within the lock housing 5 and has a locked state in which movement of the limit stop 21 to the path of retraction of the latch bolt 11 is restricted in the open state and an unlocked state in which movement of the limit stop 21 to the path of retraction of the latch bolt 11 is not restricted in the closed state.

In the latch bolt anti-insertion and anti-theft opening structure, the locking assembly 3 is arranged, so that the limiting end 210 of the limiting piece 21 is limited to move to the retraction path of the latch bolt 11 in the door opening state, and the limiting piece 21 is not limited to move to the retraction path of the latch bolt 11 in the door closing state; that is, when the door is opened, the limiting end 210 of the limiting piece 21 will not move to limit the latch bolt 11 to retract into the lock case 5 on the retraction path of the latch bolt 11 under the action of the locking assembly 3, so that the latch bolt 11 is in the unlocked state; when the door is opened, the limiting end 210 of the limiting piece 21 is not limited by the locking component 3 and can move to the retraction path of the latch bolt 11 to prevent the latch bolt 11 from retracting into the lock shell 5, so that the situation that an object enters from a gap between the door and a doorframe to push the latch bolt 11 to enter the lock shell 5 in a door closing state is prevented, and the effect of preventing the insertion and the theft is achieved; meanwhile, when the door is opened, the latch bolt 11 is in an unlocking state and can be freely retracted and extended out of the lock shell 5 without a handle or a key; the structure is more reasonable.

As for the locking assembly 3, as shown in fig. 1 to 3, it includes a first locking member 31, a second locking member 32, a first moving biasing member 33 and a second moving biasing member 34, the first moving biasing member 33 and the first locking member 31 being connected and constituting a linkage mechanism; the second moving biasing member 34 and the second locking member 32 are connected to form a linkage mechanism, and the second locking member 32 is linked with the handle; the first locking member 31 is provided with a first locking portion 310, the second locking member 32 is provided with a second locking portion 321, the first locking portion 310 is matched with the second locking portion 321, in the unlocking state, the first locking portion 310 abuts on the end surface of the second locking portion 321 opposite to the second locking member 32, and in the locking state, the first locking portion 310 abuts on the side end of the second locking portion 321, namely the left end surface as shown in fig. 2; specifically, as shown in fig. 5, the first locking member 31 is plate-shaped and includes a first sliding connection portion 312 and a second sliding connection portion 313 bent forward and formed on the right side of the upper end of the first sliding connection portion 312, the first sliding connection portion 312 is substantially Z-shaped and is slidably disposed on the bottom end surface of the lock case 5, and the second sliding connection portion 313 is slidably disposed on the top surface of the lock case 5; specifically, one or two protrusion structures (not shown) protruding downward may be disposed on the top surface of the lock case 5, and an elongated sliding slot (not shown) extending in the extending or retracting direction and engaged with the protrusion structures is disposed on the second sliding connection portion 313; the left end of the first sliding connection portion 312, that is, the portion abutting against the inner end surface of the latch bolt 11 in the locked state, is a locking abutting end 314, the locking abutting end 314 is located on the retraction path of the latch bolt 11, and when the door is closed, the latch bolt 11 abuts against the locking abutting end 314 to move, so that the locking assembly 3 moves from the locked state to the unlocked state; the first sliding connecting portion 312 is provided with a portion projecting forward, namely a locking limiting end 311, the lower end of the first sliding connecting portion 312, namely the lower end on the right side of the locking limiting end 3111, is provided with a portion projecting downward, the projecting portion and the locking abutting end 314 are formed with a first locking portion 310, an L-shaped notch (not shown) is formed between the first locking portion 310 and the locking abutting end 314, and in a locking state, the second locking portion 321 of the second locking member 32 abuts against the notch and the left end face of the first locking portion 310; a portion protruding downward to which the right end of the first moving biasing member 33 is connected is provided at the left end of the second sliding connecting portion 313, for example, a protruding structure (not shown) is provided on the top surface of the lock case 5 and at the left end of the second sliding connecting portion 313 to which the left end of the first moving biasing member 33 is connected, the first moving biasing member 33 applies a biasing force to the first locking member 31 in a direction in which the latch 11 protrudes, i.e., in a left direction as viewed in fig. 1 to 3, and the first moving biasing member 33 is a conventional tubular spring; the second locking member 32, specifically, as shown in fig. 1 to 3, is in a hook shape, and has a second locking portion 321 and an unlocking portion 322, the second locking portion 321 is a portion of the hook-shaped structure at the left end as shown in fig. 1, and in the unlocked state, the second locking portion 321 abuts on a portion of the first locking member 31 protruding toward the second locking member 32, that is, a lower end surface of the first locking portion 310; the unlocking portion 322 is a downward-projecting extension of the right end of the unlocking member shown in fig. 2, and has a recess (not shown) on the lower left end surface for abutting engagement with the unlocking assembly 4; the second moving biasing member 34 is a torsion spring, for example, a first positioning pin (not shown) may be disposed at the lower end of the locking assembly 3 in the lock housing 5, the second moving biasing member 34 is sleeved on the first positioning pin and has one end abutting on a first clamping portion (not shown) disposed at the right end of the second moving biasing member 34, and the other end abutting on a lower end face of a fixed stopper 6 disposed in the lock housing 5 and located on a retraction path of the latch 11 for limiting retraction sleeved on the latch link 12, for the fixed stopper 6, the fixed stopper 6 is fixedly disposed on the bottom end face of the lock housing 5 and located on the retraction path of the latch 11, and the latch link 12 penetrates through the fixed stopper 6; the second moving biasing member 34 applies a biasing force to the second locking member 32 moving in a direction toward the first locking member 31 to rotate the second locking member 32 about the first positioning pin. Alternatively, the second locking member 32 may be provided with a slide groove (not shown) perpendicular to the retraction direction of the latch 11 in the lock case 5 instead of being rotated, for example, being slid, the second locking member 32 may be slid toward the first locking member 31 so that the second locking portion 321 abuts against the first locking portion 310 and the second locking portion 321 abuts against the first locking portion 310 in the left notch of the first locking portion 310 in the locked state, and correspondingly, the second moving biasing member 34 may not be a torsion spring as long as a biasing force is applied to the second locking portion 321 in the direction of the first locking member 31. Alternatively, the reciprocating direction of the first locking member 31 is arranged parallel to the moving path of the latch 11. As another alternative, the first locking portion 310 is a groove (not shown) recessed inward of the first locking member 31, and the second locking portion 321 is a protrusion (not shown) protruding outward of the second locking member 32, and the protrusion abuts against the outer side of the groove wall of the groove in the locked state, and the protrusion extends into the groove to abut against the inner wall of the groove in the unlocked state.

As for the position limiting assembly 2, as shown in fig. 1 to fig. 3, the position limiting assembly 2 includes a position limiting member 21 and a position limiting biasing member 22, the position limiting member 21 is plate-shaped, the right end of the position limiting member 21 is sleeved on a second positioning pin (not shown) arranged in the lock case 5, the position limiting biasing member 22 is sleeved on the second positioning pin, one end of the position limiting member 22 abuts against a second clamping portion (not shown) at the right end of the position limiting member 21, the other end of the position limiting member 22 abuts against the right side surface of the lock case 5, and the position limiting biasing member 22 applies a biasing force to the position limiting member 21 to enable the; specifically, a gap is formed between the limiting member 21 and the first locking member 31, so that the movement between the two is not interfered by the other; a lower end surface of the limiting member 21, that is, an end surface facing the second locking member 32, is provided with a notch at a middle position, a bottom end surface of the notch is formed as a limiting locking surface 212, a limiting unlocking surface 211 is formed on a left side of the notch, that is, a limiting end 210, an unlocking protrusion 213 protruding toward the second locking member 32 is formed on a right side of the notch, that is, a side close to the limiting biasing member 22, and the limiting locking surface 212 and the limiting unlocking surface 211 are in smooth transition, specifically, for example, in a slope shape; the limiting locking surface 212 and the unlocking convex part 213 are in arc transition; in the locked state, the locking limiting end 311 abuts against the limiting locking surface 212, and in the unlocked state, the locking limiting end 311 abuts against the limiting unlocking surface 211, specifically, the distance from the limiting locking surface 212 to the moving path of the latch bolt 11 is less than the distance from the limiting unlocking surface 211 to the moving path of the latch bolt 11; the distance from the unlocking protrusion 213 to the moving path of the latch 11 is greater than the distance from the limit lock surface 212 to the moving path of the latch 11.

For the unlocking assembly 4, the unlocking assembly 4 includes a first abutting part 43, a second abutting part 42, a first abutting part 412 and a second abutting part 411, which are disposed on the shifting plate assembly linked with the handle, specifically, as shown in fig. 1 to 3, the second abutting part 411 is a protruding structure disposed on the first shifting plate 41 of the shifting plate assembly linked with the handle and protruding toward the second locking member 32; the first abutting portion 412 is a square structure integrally formed at the upper end of the first shifting board 41 and located between the fixed stopper 6 and the second abutting member 42; the first abutting piece 43 is a push plate structure which is connected with the key and can move up and down along the direction perpendicular to the extending and retracting direction of the latch bolt 11, when the first abutting piece 43 moves up to abut against the first abutting part 412, the second abutting part 411 is abutted to push the first abutting part 412 to rotate; the second abutting piece 42 is a plate-shaped structure which is slidably sleeved on the latch connecting rod 12 and is positioned on the right side of the fixed stopper 6, and the middle of the second abutting piece is provided with a hole (not shown) for accommodating the latch connecting rod 12 to penetrate through; specifically, as shown in fig. 1 to 3, the second abutting portion 411 is a protruding structure that is arranged at the left end of the first toggle plate 41 and protrudes toward the second locking member 32, the toggle plate assembly (not shown) includes a clutch structure (not shown) and the first toggle plate 41 and the second toggle plate (not shown) linked with the clutch structure, the left end of the first toggle plate 41 is provided with a protruding portion protruding toward the upper left, the protruding portion is the second abutting portion 411, and the second abutting portion 411 is matched with the unlocking portion 322; when unlocking, the key rotates to push the first abutting member 43 to move upwards, abuts against the second abutting portion 411 and pushes the second abutting portion 411 to drive the first abutting portion 412 to rotate, when the second abutting portion 411 abuts against the unlocking portion 322 at the right end of the second locking member 32, the abutting unlocking portion 322 moves upwards, so that the second locking portion 321 of the second locking member 32 overcomes the biasing force of the second moving biasing member 34 to rotate downwards, the first locking member 31 does not abut against the first locking portion 310 and leaves the reset path of the first locking member 31, namely, moves leftwards, so that the locking abutting end 314 abuts against the rear end face of the latch 11; at this time, when the handle is turned, the first abutting portion 412 at the top end of the first dial plate 41 pushes the second abutting member 42 to move rightwards when the first dial plate 41 is turned, and since the second abutting member 42 abuts on the unlocking protrusion 213, more specifically, on the left side surface of the unlocking protrusion 213, when in the locked state, the second abutting member 42 moves rightwards, which pushes the limiting member 21 to move upwards against the biasing force of the limiting biasing member 22, and at the same time, drives the limiting member 21 to move upwards to leave the retraction path of the latch 11 until the limiting unlocking surface 211 abuts on the locking limiting end 311, so that the latch 11 is unlocked; when the handle is rotated continuously, the first shifting plate 41 pushes the second pushing piece 42 to push the latch bolt connecting rod 12 and the latch bolt 11 to move rightwards and retract into the lock shell 5. Optionally, the first abutting portion 412, the second abutting portion 411 and the first dial plate 41 are integrated. The unlocking assembly 4 is of conventional construction and will not be described in detail here.

For the latch bolt assembly 1, as shown in fig. 6, a first return spring 15, a second return spring 13 and a third return spring 14 are sequentially arranged on the latch bolt connecting rod 12 from a direction close to the latch bolt 11 to a direction away from the latch bolt 11, a first retainer ring 16 is arranged between the first return spring 15 and the second return spring 13, a second retainer ring 17 is arranged at the right end of the second return spring 13, and the second retainer ring 17 is positioned at the left side of the fixed retainer 6; the third return spring 14 is arranged at the right end of the second pushing part 42, the right end of the third return spring 14 is provided with a third retainer ring 18 and a fourth retainer ring 19, the first retainer ring 16, the second retainer ring 17 and the third retainer ring 18 are closed-loop retainer rings, and the fourth retainer ring 19 is an open-loop retainer ring, which is not specifically limited or described; salient points 110 protruding in the radial direction are arranged at the right end of the second abutting part 42 on the latch bolt connecting rod 12, the salient points 110 are uniformly arranged along the circumferential direction, and the third return spring 14 is sleeved outside the salient points 110. The raised point 110 is provided to limit the second abutting member 42 from moving rightward out of the latch link 12.

In order to facilitate understanding of the positions and the connection relations between the components in the utility model under different states, the following description is made one by one about the three states of opening and closing the door and opening the door by a key or a handle.

When the door is opened, the latch bolt 11 completely extends out of the lock case 5, the locking assembly 3 is in a locking state, and the limit end 210 of the limit member 21 is limited to enter a retraction path of the latch bolt 11, at this time, the locking abutting end 314 of the first locking member 31 abuts against an inner end surface, namely a right end surface, of the latch bolt 11, the limit unlocking surface 211 of the limit member 21 abuts against the locking limit end 311, the limit end 210 of the limit member 21 is not located on the retraction path of the latch bolt 11, the second locking member 321 of the second locking member 32 abuts against the first locking member 310 of the first locking member 31, and the second pushing member 42 is located at the right end of the limit locking surface 212 of the limit member 21 but is not abutted against the limit member 21; since the position-limiting member 21 does not abut against the retraction path of the latch bolt 11, the latch bolt assembly 1 is unlocked, and the latch bolt 11 can be freely retracted into the lock housing 5 or extended out of the lock housing 5.

When the door is closed, due to the squeezing action of the door frame, the latch tongue 11 abuts against the locking abutting end 314 of the first locking member 31 to push the locking assembly 3 into the lock case 5, and when the latch tongue 11 completely enters the lock case 5, the right end face of the first locking portion 310 of the first locking member 31 abuts against the left end face of the fixed stopper 6, at this time, because the first locking portion 310 does not abut against the second locking portion 321, the second locking portion 321 moves towards the direction of the first locking member 31, i.e. the upper end, under the action of the second moving biasing member 34 and abuts against the reset path, i.e. the left moving path, of the first locking member 31; then, after the door is closed, because the door frame does not apply a squeezing force to the latch bolt assembly 1, the first locking member 31 moves towards the extending direction under the action of the first moving biasing member 33 to push the latch bolt 11 to extend out of the lock case 5, when the left side of the first locking portion 310 of the first locking member 31 moves to abut against the second locking portion 321, at this time, the first locking member 31 does not move towards the extending direction, the latch bolt 11 continues to move towards the extending direction and extend out of the lock case 5 under the resetting action of the first return spring 15 and the second return spring 13 until the latch bolt 11 extends out of the lock case 5 completely, at this time, because the first locking member 31 does not abut against the inner end surface of the latch bolt 11 any more, the locking assembly 3 is in the unlocked state, the distance between the locking limit end 311 and the inner end surface of the latch bolt 11 is increased, and therefore, the limiting member 21 moves towards the lower side of the latch bolt connecting rod 12 under the action of the limiting biasing member 22 to enter into the empty space between the inner end surface of the latch bolt The second abutting member 42 abuts against the unlocking protrusion 213 of the limiting member 21 until the limiting locking surface 212 of the limiting member 21 abuts against the locking limiting end 311, that is, the limiting end 210 of the limiting member 21 completely enters the retraction path of the latch bolt 11; due to the abutting action of the locking limit end 311, the limit member 21 is fixed on the retraction path of the latch bolt 11, the latch bolt assembly 1 is locked, and the latch bolt 11 cannot be pushed back into the lock case 5 by inserting an object through the door aperture.

When the door needs to be opened, the first abutting part 43 is pushed to move upwards through the rotation of the key, the second abutting part 411 is pushed to rotate upwards to abut against the unlocking part 322 of the second locking part 32, then the handle is rotated, the second abutting part 322 can move upwards in the rotation process of the handle, the second locking part 321 of the second locking part 32 can rotate downwards towards the direction opposite to the unlocking part 322, the second locking part 321 is not abutted against the first locking part 310 of the first locking part 31, and the abutting of the reset path of the first locking part 31 is released; meanwhile, since the second abutting member 42 abuts on the left side surface of the unlocking protrusion 213 of the limiting member 21 in the locked state, therefore, when the rotating handle drives the first dial plate 41 to rotate, the first abutting part 412 pushes the second abutting part 42 to move rightwards, the second abutting part 42 abuts against the unlocking convex part 213 so that the limiting part 21 overcomes the biasing force of the limiting biasing part 22 and rotates upwards around the second positioning pin, the limiting end 210 of the limiting part 21 also rotates upwards to leave the retraction path of the latch bolt 11 until the limiting unlocking surface 211 of the limiting part 21 abuts against the locking limiting end 311 of the first locking part 31, at this time, the first locking part 31 resets towards the extending direction of the latch bolt 11 under the action of the first moving biasing part 33 until the locking abutting end 314 of the first locking part 31 abuts against the inner end surface of the latch bolt 11, and at this time, the latch bolt assembly 1 and the first locking part 31 form a linkage mechanism; continuing to rotate the handle, due to the arrangement of the salient point 110 on the latch bolt connecting rod 12, the first shifting plate 41 can drive the linkage mechanism formed by the latch bolt assembly 1 and the first locking piece 31 to retract into the lock case 5 together until the latch bolt 11 completely enters the lock case 5, unlocking is completed, and the door can be opened, after the door is opened, the latch bolt 11 and the latch bolt connecting rod 12 can extend out of the lock case 5 towards the extending direction under the action of the first return spring 15 and the second return spring 13, and simultaneously the first locking piece 31 can reset towards the extending direction under the action of the first moving biasing piece 33, and since the handle is still in a rotating state at this time, namely the second abutting part 411 is still abutted to the unlocking part 322 of the second locking piece 32, the first abutting part 412 is still abutted to the left side of the second abutting part 42; therefore, the reset path of the first locking part 310 of the first locking member 31 is not limited until the locking abutting end 314 of the first locking member 31 completely resets and abuts against the inner end surface of the latch bolt 11, and at this time, because the distance between the locking limiting end 311 of the first locking member 31 and the inner end surface of the latch bolt 11 becomes smaller, the limiting end 210 of the limiting member 21 will be limited from entering the retraction path of the latch bolt 11, so that, after the latch bolt assembly 1 and the first locking member 31 completely reset, the limiting end 210 of the limiting member 21 cannot enter the retraction path of the latch bolt 11, at this time, the limiting unlocking surface 211 of the limiting member 21 abuts against the locking limiting end 311 of the first locking member 31, and the latch bolt 11 is in the unlocking state; after the handle is released, the second abutting part 42 moves leftwards to reset under the action of the third return spring 14 and pushes the first abutting part 412 to rotate anticlockwise to reset, because the first abutting part 412, the second abutting part 411 and the first shifting plate 41 are linked, when the first abutting part 412 rotates anticlockwise, the first shifting plate 41 and the second abutting part 411 are driven to rotate to reset, and the first abutting part 412 rotates to abut against the first abutting part 43 to move downwards to reset.

Example 2

As shown in fig. 1 to 6, the door lock provided in this embodiment includes a lock case 5 and an oblique-tongue anti-insertion and anti-theft structure provided in the lock case 5, where the oblique-tongue anti-insertion and anti-theft structure is the oblique-tongue anti-insertion and anti-theft structure according to embodiment 1. Optionally, the door lock of the present embodiment may further include another latch assembly (not shown) such as is commonly found in existing door locks, and the latch assembly 1 is used in cooperation with the door lock, which is also within the protection scope of the present invention.

Because the door lock of the embodiment comprises the latch bolt anti-insertion and anti-theft opening structure, the latch bolt component 1 can be locked when the door is closed, and an object entering from a door gap is prevented from pushing the latch bolt component 1 back into the lock shell 5, so that the anti-theft effect can be effectively achieved, and the personal and property safety can be protected; meanwhile, when the door is opened, the latch bolt assembly 1 is in an unlocking state, the locking of the latch bolt assembly 1 is not required to be released through a handle when the door is closed, the door is more convenient to use, and the door lock or the door frame is prevented from being damaged when the door is violently closed.

It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications can be made without departing from the scope of the invention.

Claims (16)

1. An oblique tongue anti-insertion and anti-theft structure, comprising:

the latch bolt assembly (1) comprises a latch bolt (11) which can extend out of or retract into the lock shell (5);

the limiting assembly (2) comprises a limiting piece (21) which is rotatably installed in the lock shell (5), and a limiting biasing piece (22) which provides a limiting end (210) of the limiting piece (21) close to the latch bolt (11) to move towards a retraction path of the latch bolt (11);

the unlocking assembly (4) is arranged in the lock shell (5) in linkage with the handle, pushes the limiting piece (21) against to rotate, and enables the limiting end (210) to move out of a retraction path of the latch bolt (11);

it is characterized by also comprising:

the locking assembly (3) is movably arranged in the lock shell (5) and has a locking state for limiting the movement of the limiting piece (21) to the retraction path of the latch bolt (11) in the door opening state and an unlocking state for not limiting the movement of the limiting piece (21) to the retraction path of the latch bolt (11) in the door closing state.

2. The latch bolt anti-theft structure according to claim 1, wherein the locking assembly (3) has a locking abutting end (314) located on the retraction path of the latch bolt (11), and when the door is closed, the latch bolt (11) pushes the locking abutting end (314) to move, so that the locking assembly (3) moves from the locking state to the unlocking state.

3. The latch bolt anti-theft structure according to claim 2, wherein the locking assembly (3) comprises a first locking member (31), one end of the first locking member (31) is the locking abutment end (314), and the first locking member (31) has a locking limiting end (311) which limits the movement of the limiting member (21) to the retraction path of the latch bolt (11) in the locking state and does not limit the movement of the limiting member (21) to the retraction path of the latch bolt (11) in the unlocking state.

4. A latch bolt anti-tamper structure according to claim 3, characterized in that the direction of reciprocal movement of the first locking member (31) is arranged parallel to the path of movement of the latch bolt (11).

5. The latch bolt anti-theft structure according to claim 3, wherein the limiting member (21) has a limiting locking surface (212) abutting against the locking limiting end (311) in the locking state and a limiting unlocking surface (211) abutting against the locking limiting end (311) in the unlocking state, the distance from the limiting locking surface (212) to the moving path of the latch bolt (11) is smaller than the distance from the limiting unlocking surface (211) to the moving path of the latch bolt (11), and the limiting locking surface (212) is smoothly transited to the limiting unlocking surface (211).

6. A latch bolt anti-tamper structure according to claim 3, characterized in that the locking assembly (3) further comprises a first movement biasing member (33) connected to the first locking member (31) for providing the first locking member (31) with a movement towards the direction of extension of the latch bolt (11).

7. The skew-tongue anti-insertion-and-theft structure according to claim 6, wherein the locking assembly (3) further comprises a second locking member (32) for locking the first locking member (31) in the unlocked state and unlocking the first locking member (31) in the locked state.

8. The skew bolt anti-insert and anti-theft structure according to claim 7, wherein the second locking piece (32) is provided in linkage with the handle.

9. A latch bolt anti-tamper structure according to claim 8, characterized in that the second locking member (32) is movably arranged in the lock housing (5) and is provided with a second movement biasing member (34) for biasing a second locking portion (321) of the second locking member (32) towards the first locking member (31), and the first locking member (31) is provided with a first locking portion (310) arranged to cooperate with the second locking portion (321).

10. The latch bolt anti-tamper structure according to claim 9, wherein the first locking portion (310) is a recess recessed inward of the first locking member (31), and the second locking portion (321) is a protrusion protruding outward of the second locking member (32), and the protrusion abuts against an outer side of a groove wall of the recess in the locked state, and the protrusion extends into the recess and abuts against an inner wall of the recess in the unlocked state.

11. A latch bolt anti-tamper arrangement according to claim 9 or 10, characterised in that the second locking member (32) is rotatably arranged in the lock housing (5) and the second moving biasing member (34) is a torsion spring.

12. A latch anti-tamper structure according to claim 11, wherein the unlocking assembly (4) comprises a second abutting portion (411) which abuts against an unlocking portion (322) on the second locking member (32) to urge the second locking member (32) to move against the second moving biasing member (34).

13. The latch bolt anti-insert and anti-theft structure according to claim 12, wherein the second abutting portion (411) is a protrusion structure disposed in the extending direction of the latch bolt (11) and protruding toward the second locking member (32).

14. The latch bolt anti-tamper structure according to claim 12, wherein the unlocking assembly (4) further comprises a first abutting member (43) which is controlled by a key to move and can abut against the second abutting portion (411) to drive the second abutting portion (411) to move so as to move the second locking member (32) against the second moving biasing member (34).

15. The latch bolt anti-plug and anti-theft structure according to claim 14, wherein the unlocking assembly (4) further comprises a first abutting portion (412) connected to the handle, a second abutting member (42) is slidably disposed on the latch bolt connecting rod (12) of the latch bolt assembly (1), the first abutting portion (412) rotatably pushes the second abutting member (42) to move, when the first abutting portion (412) rotates, the limiting member (21) is abutted to rotate, so that the limiting end (210) moves out of the retraction path of the latch bolt (11), and the second abutting portion (411) is disposed on the first abutting portion (412).

16. A door lock comprising a lock housing and a latch bolt anti-tamper structure provided in the lock housing, wherein the latch bolt anti-tamper structure is as claimed in any one of claims 1 to 15.

Images