Bolt mechanism and double-leaf door

Abstract

The invention discloses a bolt mechanism and a double-leaf door. The bolt mechanism comprises a shell assembly and a connecting rod assembly. The connecting rod assembly comprises a connecting rod body and a torsional spring which are in transmission connection. The transmission assembly is arranged in the shell assembly in a penetrating mode and comprises a first telescopic arm and a second telescopic arm, and a clamping block is fixedly arranged on the second telescopic arm; the unlocking assembly is movably arranged in the shell assembly in a penetrating manner and comprises a pressing piece; the fixing piece is fixedly arranged on the pressing piece; the locking piece is movably arranged on the pressing piece in a penetrating mode and can be detachably connected with the clamping block in a clamped mode; the movable connecting rod is fixedly connected to the fixing piece and is arranged on the locking piece in a sliding manner; the third elastic piece is arranged between the pressing piece and the guide piece; and the fourth elastic piece is arranged between the fixing piece and the locking piece. The functions of manual locking and automatic opening of the auxiliary door can be achieved, and the problem that an existing auxiliary door leaf cannot be automatically opened along with opening of a main door leaf is effectively solved.

Description

Technical Field

[0001] The invention relates to the technical field of hardware accessories, and in particular to a latch mechanism and a double-leaf door. Background Art

[0002] With the development of society and the continuous improvement of living standards, people have higher and higher requirements for fire safety of entrance doors. The new standard GB12955-2024 "Fire Door" has been released and will be officially implemented on May 1, 2026. In the new standard for fire doors, it is clearly required that "the bolts installed on the fire doors of evacuation passages should be able to open automatically when the door leaves are opened." There are many types of bolts on the market, but there are fewer automatic bolts. The existing automatic bolts are generally split bolts, and one bolt must be installed at the upper and lower ends of a door. They can only be used for indoor wooden doors and cannot be used for entrance doors. Moreover, this type of automatic bolt cannot meet the user's requirement to close the auxiliary door leaf separately when using it. The bolt can only work passively to lock the door leaf when the two door leaves of the double door are closed at the same time. Therefore, the market urgently needs to develop new automatic bolts to meet the potential needs of the market. In order to meet the requirements of the new standard for fire doors and meet the practical needs of users when using double-leaf anti-theft doors and fire doors; therefore, a bolt mechanism and a double-leaf door are provided to solve the above problems. Summary of the invention

[0003] One of the purposes of the present invention is to provide a latch mechanism and a double-leaf door so as to solve the problem that the existing auxiliary door leaf cannot be opened automatically following the opening of the main door leaf.

[0004] The latch mechanism and double-leaf door of the present invention can be realized by the following technical solutions:

[0005] A latch mechanism of the present invention comprises a housing assembly; a connecting rod assembly, which comprises a connecting rod body and a torsion spring connected in transmission, wherein the connecting rod body and the torsion spring are sequentially arranged on a positioning column in the housing assembly; a transmission assembly, which is arranged through the housing assembly, and the connecting rod assembly can drive the transmission assembly to move, so as to realize a manual locking function of a secondary door leaf; an unlocking assembly, which is movably arranged through the housing assembly and can be detachably engaged with the transmission assembly, and the unlocking assembly and the transmission assembly can realize an automatic unlocking function of the secondary door leaf;

[0006] The transmission assembly includes a first telescopic arm and a second telescopic arm, which are respectively movable and penetrate the opposite sides of the housing assembly; a clamping block is fixedly provided on the second telescopic arm, and the clamping block can be detachably engaged with the unlocking assembly, and a contact portion between the clamping block and the unlocking assembly is provided with an inclined surface;

[0007] Among them, the unlocking component includes a pressing piece, which movably passes through the shell component; a fixing plate fixedly arranged on the pressing piece; a locking piece movably passed through the pressing piece and capable of being detachably engaged with the blocking block; a movable connecting rod with one end fixedly connected to the fixing plate and the other end slidably arranged on the locking piece; a third elastic piece passing through the pressing piece and arranged between the pressing piece and the guide plate; and a fourth elastic piece passing through the pressing piece and arranged between the fixing plate and the locking piece.

[0008] In one embodiment, the transmission assembly also includes a lever gear, a first transmission gear, a second transmission gear, a first elastic member and a second elastic member; the lever gear is rotatably disposed in the housing assembly and is capable of contacting and connecting with the connecting rod assembly; the first transmission gear is rotatably disposed in the housing assembly and is meshingly and transmission-connected with the lever gear; the first telescopic arm is transmission-connected with the first transmission gear; the second transmission gear is rotatably disposed in the housing assembly and is transmission-connected with the first telescopic arm; the second telescopic arm is transmission-connected with the second transmission gear; the two ends of the first elastic member are respectively connected to the housing assembly and the first telescopic arm; the two ends of the second elastic member are respectively connected to the housing assembly and the second telescopic arm.

[0009] In one embodiment, a first rack and a second rack are respectively provided on opposite sides of the first telescopic arm, the first rack is meshed and transmission-connected with the first transmission gear, and the second rack is meshed and transmission-connected with the second transmission gear.

[0010] In one embodiment, a guide slot is provided on the locking member, and one end of the movable connecting rod is slidably disposed in the guide slot.

[0011] In one embodiment, sliding arc surfaces are respectively provided on both sides of the locking member in contact with the clamping block, and the sliding arc surfaces cooperate with the inclined surface of the clamping block.

[0012] In one embodiment, a third rack is provided on the same side of the second telescopic arm and the clamping block, and the third rack is meshed and transmission-connected with the second transmission gear.

[0013] In one embodiment, the connecting rod body includes an integrally formed connecting head, a connecting rod short end and a connecting rod long end, and the connecting rod short end and the connecting rod long end are arranged on the same straight line and are respectively arranged at two ends of the connecting head.

[0014] In one embodiment, the shell assembly includes a fixed panel and a main shell, the main shell is fixedly installed on the side of the fixed panel; and a cover plate is fixedly arranged on the main shell.

[0015] In one embodiment, a plurality of positioning columns and guide plates are fixedly provided on the main inner wall of the main shell, and the pressing member movably passes through the guide plates; a guide block is fixedly provided on the side inner wall of the main shell, and the second telescopic arm can be slidably connected relative to the guide block.

[0016] A double-leaf door of the present invention comprises the latch mechanism described in any one of the above items;

[0017] It also includes a door frame, an auxiliary door leaf, a main door leaf and two latch rods;

[0018] The door frame is the supporting body; the auxiliary door leaf and the main door leaf are respectively rotatably connected to the door frame and can be relatively opened or closed; the latch mechanism is fixedly arranged on the auxiliary door leaf and its pressing piece can be elastically contacted and connected with the main door leaf; the two latch rods are respectively movably arranged in the auxiliary door leaf and are respectively transmission-connected with the first telescopic arm and the second telescopic arm in the latch mechanism.

[0019] Compared with the prior art, the latch mechanism and double-leaf door of the present invention have the following beneficial effects:

[0020] The present invention provides a latch mechanism and a pressing member in a double-leaf door. When the main door leaf is opened, the compressive force acting on the pressing member disappears, and the fixing plate, the movable connecting rod and the locking member are driven to move in sequence under the action of the restoring force of the elastic member, so that the locking member releases the locking connection with the card block, and the two telescopic arms move respectively under the action of the restoring force of the elastic member, thereby realizing the automatic opening operation of the auxiliary door leaf, and effectively solving the problem that the existing auxiliary door leaf cannot be automatically opened following the opening of the main door leaf; at the same time, the lever gear, the first transmission gear, the first telescopic arm, the second transmission gear and the second telescopic arm are driven to move in sequence through the connecting rod body, so that the two telescopic arms are extended, thereby driving the two latch rods to extend into the corresponding latch holes; at the same time, the card block moves to engage with the locking member, thereby completing the operation of manually locking the auxiliary door leaf. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0022] Figure 1 It is a structural schematic diagram of a latch mechanism of the present invention in a first use state;

[0023] Figure 2It is a structural schematic diagram of a latch mechanism of the present invention in a second use state;

[0024] Figure 3 It is a structural schematic diagram of a latch mechanism of the present invention in a third use state;

[0025] Figure 4 It is a schematic diagram of the exploded structure of a latch mechanism of the present invention, comprising a main housing, a connecting rod body, a second telescopic arm, a pressing member and a locking member;

[0026] Figure 5 yes Figure 4 A schematic structural diagram of the main housing shown;

[0027] Figure 6 yes Figure 4 A schematic structural diagram of the connecting rod body shown;

[0028] Figure 7 yes Figure 4 A schematic structural diagram of the second telescopic arm shown;

[0029] Figure 8 yes Figure 4 A schematic diagram of the structure of the pressing member shown;

[0030] Fig. 9 yes Figure 4 A schematic diagram of the structure of the locking member shown;

[0031] Fig.10 It is a structural schematic diagram of a double-leaf door of the present invention.

[0032] Indications in the figure: 100, latch mechanism; 10, housing assembly; 11, fixing panel; 111, connecting rod groove; 112, positioning hole; 113, mounting hole; 114, first fixing hole; 12, main housing; 121, second fixing hole; 122, positioning column; 123, through hole; 124, guide block; 125, connecting buckle; 126, guide sheet; 13, cover plate; 20, connecting rod assembly; 21, connecting rod body; 211, connecting head; 2111, connecting hole; 212, connecting rod short end; 213, connecting rod long end; 22, torsion spring; 30, transmission assembly; 31, lever gear; 311, lever body; 32, first transmission gear; 33, first telescopic arm; 331, first gear 332, second rack; 333, first hook; 34, second transmission gear; 35, second telescopic arm; 351, block; 352, third rack; 353, second hook; 354, guide groove; 36, first elastic member; 37, second elastic member; 40, unlocking assembly; 41, pressing member; 411, connecting shaft; 4111, slot; 412, pressing head; 42, fixing plate; 43, locking member; 431, connecting shaft hole; 432, guide slide groove; 433, sliding arc surface; 44, movable connecting rod; 45, third elastic member; 46, fourth elastic member; 200, door frame; 201, latch hole; 300, auxiliary door leaf; 400, main door leaf; 500, latch rod. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0034] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] See also Figure 1-Figure 10As shown, a latch mechanism 100 of the present invention mainly includes a shell assembly 10, a connecting rod assembly 20, a transmission assembly 30 and an unlocking assembly 40; the shell assembly 10 is a hollow cavity, which is fixedly arranged on the auxiliary door leaf 200; the connecting rod assembly 20 is movably arranged through the side of the shell assembly 10; the transmission assembly 30 is arranged through the shell assembly 10, and the connecting rod assembly 20 can be contacted and connected with the transmission assembly 30 for transmission, thereby driving the transmission assembly 30 to synchronously drive two latch rods 500 to extend into the corresponding latch holes 201 on the door frame 200, thereby realizing the manual locking function of the auxiliary door leaf 300; the unlocking assembly 40 is movably arranged through the shell assembly 10 and can be contacted and connected with the transmission assembly 30, thereby driving the transmission assembly 30 to synchronously drive the two latch rods 500 to retract from the corresponding latch holes 201, thereby realizing the automatic unlocking function of the auxiliary door leaf 300.

[0036] See also Figure 1-Figure 4 As shown, in this embodiment, the housing assembly 10 includes a fixed panel 11, a main housing 12 and a cover plate 13; the fixed panel 11 is fixedly arranged on the side of the auxiliary door leaf 300, the connecting rod assembly 20 is movably arranged on the fixed panel 11, and the unlocking assembly 40 is movably arranged on the fixed panel 11; the main housing 12 is a hollow cavity, which is fixedly arranged on the side of the fixed panel 11, and the transmission assembly 30 and the unlocking assembly 40 are movably arranged in the main housing 12; the cover plate 13 is fixedly arranged on the main housing 12. Specifically, the fixed panel 11 is respectively penetrated with a connecting rod groove 111, a positioning hole 112, a plurality of mounting holes 113 and a plurality of first fixing holes 114, the connecting rod assembly 20 is movably arranged on the fixed panel 11 through the connecting rod groove 111, the unlocking assembly 40 is movably arranged on the fixed panel 11 through the positioning hole 112, the fixed panel 11 is fixedly installed on the side of the auxiliary door leaf 300 through the plurality of mounting holes 113, and the main housing 12 is fixed on the fixed panel 11 through the plurality of first fixing holes 114.

[0037] See also Figure 4 and Figure 5As shown, specifically, a plurality of second fixing holes 121 are provided on the side of the main housing 12, and the positions of the plurality of second fixing holes 121 correspond to the positions of the corresponding first fixing holes 114, and the fastening screws pass through the first fixing holes 114 and the second fixing holes 121 in sequence to fix the main housing 12 on the fixed panel 11; a plurality of positioning columns 122 and guide pieces 126 are fixedly provided on the main inner wall of the main housing 12, and the connecting rod assembly 20 is penetrated and provided on the corresponding positioning columns 122, and some of the positioning columns 122 are provided with internal threads, and the fastening screws penetrate the cover plate 13 and are threadedly connected to the positioning columns 122 provided with internal threads. The column 122 fixes the cover plate 13 on the main shell 12, and the position of the guide piece 126 corresponds to the position of the positioning hole 112; through holes 123 are respectively provided on the opposite sides of the main shell 12, and the transmission assembly 30 passes through the opposite sides of the main shell 12 through the two through holes 123; a guide block 124 is fixedly provided on the inner wall of the side of the main shell 12, and the guide block 124 is slidably connected with the transmission assembly 30, so as to guide the transmission assembly 30; connecting buckles 125 are also respectively provided on the opposite sides of the main shell 12, and the two connecting buckles 125 are respectively connected with the transmission assembly 30.

[0038] See also Figure 4 and Figure 6 As shown, in this embodiment, the connecting rod assembly 20 includes a connecting rod body 21 and a torsion spring 22, the connecting rod body 21 and the torsion spring 22 are transmission-connected and sequentially arranged on the corresponding positioning column 122, the torsion spring 22 provides a restoring force to the connecting rod body 21, so that the connecting rod body 21 returns to the initial position, the initial position is that the connecting rod body 21 is horizontally arranged in the connecting rod groove 111, and the connecting rod body 21 is movable through the connecting rod groove 111 to penetrate the fixed panel 11. Specifically, the connecting rod body 21 includes an integrally formed connecting head 211, a connecting rod short end 212 and a connecting rod long end 213, the connecting head 211 is rotatably connected to the corresponding positioning column 122 through a connecting hole 2111, the connecting rod short end 212 and the connecting rod long end 213 are arranged on the same straight line and are respectively arranged at both ends of the connecting head 211, and the connecting rod long end 213 is driven to rotate out of the connecting rod groove 111 by pressing the connecting rod short end 212.

[0039] See also Figure 1-Figure 4As shown, in this embodiment, the transmission assembly 30 includes a lever gear 31, a first transmission gear 32, a first telescopic arm 33, a second transmission gear 34, a second telescopic arm 35, a first elastic member 36 and a second elastic member 37; the lever gear 31 and the connecting rod body 21 are sequentially arranged on the corresponding positioning column 122, and the connecting rod body 21 can be in contact with the lever gear 31, thereby driving the lever gear 31 to rotate; the first transmission gear 32 is rotatably arranged on the corresponding positioning column 122 and meshed with the lever gear 31 for transmission connection, and the lever gear 31 drives the first transmission gear 32 to rotate on the corresponding positioning column 122; the first telescopic arm 33 movably penetrates the side of the main housing 12 through the corresponding through hole 123 and is transmission-connected with the first transmission gear 32, and the first transmission gear 32 can drive the first telescopic arm 33 to move relative to the main housing 12, thereby driving the corresponding latch rod 500 to extend into the latch hole 201 or retract from the latch hole 201; the second transmission gear 34 is rotatably arranged on the corresponding positioning column 122 and is transmission-connected with the first telescopic arm 33, the first telescopic arm 33 drives the second transmission gear 34 to rotate on the corresponding positioning column 122; the second telescopic arm 35 movably penetrates the side of the main shell 12 through the corresponding through hole 123 and is transmission-connected with the second transmission gear 34, the second transmission gear 34 can drive the second telescopic arm 35 to move relative to the main shell 12, thereby driving the corresponding latch rod 500 to extend into the latch hole 201 or retract from the latch hole 201, the unlocking component 40 can detachably engage the second telescopic arm 35, thereby locking the first telescopic arm 33 and the second telescopic arm 35 at the same time; one end of the first elastic member 36 is connected to the corresponding connecting buckle 125, and the other end thereof is connected to the first telescopic arm 33, the first elastic member 36 provides a restoring force to the first telescopic arm 33; one end of the second elastic member 37 is connected to the corresponding connecting buckle 125, and the other end thereof is connected to the second telescopic arm 37, the second elastic member 37 provides a restoring force to the second telescopic arm 35. Specifically, a lever body 311 is fixedly provided on the lever gear 31 , and the connecting rod body 21 can be in contact and connected with the lever body 311 , thereby driving the lever gear 31 to rotate; the first elastic member 36 and the second elastic member 37 are springs.

[0040] See also Figure 4 As shown, specifically, a first rack 331 and a second rack 332 are respectively provided on opposite sides of the first telescopic arm 33, the first rack 331 is meshed and transmission-connected with the first transmission gear 32, and the second rack 332 is meshed and transmission-connected with the second transmission gear 34; a first hook 333 is also fixedly provided on the first telescopic arm 33, and one end of the first elastic member 36 is connected to the first hook 333.

[0041] See also Figure 4 and Figure 7As shown, specifically, a clamping block 351 is fixedly provided on the second telescopic arm 35, and the clamping block 351 can be detachably engaged with the unlocking component 40, and a slope is provided at the contact portion between the clamping block 351 and the unlocking component 40; a third rack 352 is provided on the same side of the second telescopic arm 35 and the clamping block 351, and the third rack 352 is meshed and transmission-connected with the second transmission gear 34; a second hook 353 is also provided on the second telescopic arm 35, and one end of the second elastic member 37 is connected to the second hook 353; a guide groove 354 is provided on the side of the second telescopic arm 35 opposite to the third rack 352, and the guide block 124 is provided in the guide groove 354, and the guide groove 354 can slide relative to the guide block 124, thereby guiding the movement of the second telescopic arm 35.

[0042] See also Figure 1-Figure 4 As shown, in this embodiment, the unlocking assembly 40 includes a pressing member 41, a fixing plate 42, a locking member 43, a movable connecting rod 44, a third elastic member 45 and a fourth elastic member 46; the pressing member 41 movably penetrates the fixed panel 11 through the positioning hole 112 to extend into the main shell 12 and movably penetrates the guide plate 126; the fixing plate 42 is fixedly arranged on the pressing member 41, and moves with the movement of the pressing member 41; the locking member 43 is movably penetrated on the pressing member 41, and can be detachably engaged with the block 351; one end of the movable connecting rod 44 is fixedly connected to the fixing plate 42, and the other end thereof is slidably arranged on the locking member 43; the third elastic member 45 is penetrated on the pressing member 41 and is arranged between the pressing member 41 and the guide plate 126, and provides a restoring force to the pressing member 41; the fourth elastic member 46 is penetrated on the pressing member 41 and is arranged between the fixing plate 42 and the locking member 43, and provides a restoring force to the locking member 43. Specifically, the third elastic member 45 and the fourth elastic member 46 are springs.

[0043] See also Figure 4 and Figure 8 As shown, specifically, the pressing member 41 includes a connecting shaft 411 and a pressing head 412; the connecting shaft 411 sequentially passes through the third elastic member 45, the guide plate 126, the fixing plate 42, and the fourth elastic member 46 and extends into the locking member 43; the pressing head 412 is fixedly arranged on one side of the connecting shaft 411 and movably passes through the fixed panel 11 through the positioning hole 112.

[0044] See also Figure 4 and Fig. 9As shown, specifically, a connecting shaft hole 431 is provided on the locking member 43, and the connecting shaft 411 is movably provided in the connecting shaft hole 431; a guide groove 432 is provided on the locking member 43, and one end of the movable connecting rod 44 is slidably provided in the guide groove 432, and the guide groove 432 guides and limits the movement of the movable connecting rod 44; sliding arc surfaces 433 are respectively provided on both sides of the locking member 43 that contact the block 351, so as to facilitate the cooperation with the inclined surface of the block 351.

[0045] See also Fig.10 As shown, a double-leaf door of the present invention comprises the latch mechanism 100 of any one of the above items, a door frame 200, an auxiliary door leaf 300, a main door leaf 400 and two latch rods 500; the door frame 200 is a supporting body; the auxiliary door leaf 300 and the main door leaf 400 are respectively rotatably connected to the door frame 200 and can be relatively opened or closed; the latch mechanism 100 is fixedly arranged on the auxiliary door leaf 300 and can be elastically contacted and connected with the main door leaf 400; the two latch rods 500 are respectively movably penetrated in the auxiliary door leaf 300 and are respectively transmission-connected with the first telescopic arm 33 and the second telescopic arm 35 in the latch mechanism 100, and the first telescopic arm 33 and the second telescopic arm 35 respectively drive the two latch rods 500 to synchronously extend into the corresponding latch hole 201 on the door frame 200 or retract from the latch hole 201, thereby realizing the opening or locking operation of the auxiliary door leaf 300.

[0046] It should be noted that the specific working process of the latch mechanism and the double-leaf door of the present invention is as follows:

[0047] When the main door leaf 400 is opened and the auxiliary door leaf 300 needs to be locked manually, please refer to Figure 1 and Figure 4As shown, the short end 212 of the connecting rod is pressed inwardly, so that the connecting rod body 21 overcomes the pressing force of the torsion spring 22, and drives the long end 213 of the connecting rod to rotate out of the connecting rod groove 111, and then the long end 213 of the connecting rod is held by hand and rotated outwardly at the same time, driving the short end 212 of the connecting rod to rotate inwardly, thereby driving the lever gear 31 to rotate, and the lever gear 31 drives the first transmission gear 32, the first telescopic arm 33, the second transmission gear 34, and the second telescopic arm 35 to move in sequence, so that the first telescopic arm 33 and the second telescopic arm 35 are extended from the housing assembly 10 at the same time, and the first telescopic arm 33 and the second telescopic arm 35 respectively drive the two latch rods 500 to extend into the corresponding latch holes 201; when the second telescopic arm 35 is extended outward, the inclined surface of the block 351 follows the movement of the second telescopic arm 35, thereby contacting the sliding arc surface 433 on one side of the locking member 43, so that the locking member 43 is forced to fix the panel 1 1 and compress the fourth elastic member 46 at the same time, and the fourth elastic member 46 accumulates a restoring force. When the block 351 follows the movement of the second telescopic arm 35 and slides over the locking member 43, the locking member 43 returns to the initial position under the restoring force of the fourth elastic member 46, thereby engaging the block 351, so that the extended positions of the first telescopic arm 33 and the second telescopic arm 35 are fixed, and the operation of manually locking the auxiliary door leaf 300 is completed. At the same time, the first telescopic arm 33 and the second telescopic arm 35 respectively stretch the first elastic member 36 and the second elastic member 37, so that the first elastic member 36 and the second elastic member 37 accumulate a restoring force; when the external force on the long end 213 of the connecting rod disappears, the connecting rod body 21 returns to the connecting rod groove 111 under the restoring force of the torsion spring 22 and is flush with the horizontal plane of the fixed panel 11, and under the pressing force of the torsion spring 22, the connecting rod body 21 will not loosen.

[0048] When the auxiliary door leaf 300 is locked and the main door leaf 200 is closed, the anti-scratch sheet on the side of the main door leaf 200 touches the arc surface of the pressing head 412 on the pressing piece 41, pushing the pressing piece 41 to retract into the main shell body 12, and the main door leaf 200 is closed normally at this time; when the pressing piece 41 retracts back, it drives the connecting shaft 411 to move in the direction of the main shell body 12, and the third elastic piece 45 is compressed to support the back side of the pressing head 412; the fixing piece 42 also moves the fourth elastic piece 46 inward under the drive of the connecting shaft 411, and the movable connecting rod 44 is driven by the fixing piece 42, and its one end movably arranged on the locking piece 43 moves to the farthest end of the guide groove 432 under the guide action of the guide groove 432.

[0049] When the main door leaf 200 is opened, the external force acting on the pressing head 412 disappears, and the pressing head 412 moves outward under the action of the restoring force of the third elastic member 45. The connecting shaft 411 also moves outward following the movement of the pressing head 412. The connecting shaft 411 drives the fixing plate 42 to move in the direction of the fixed panel 11. The movable connecting rod 44 drives the locking member 43 to move in the direction of the fixed panel 11 under the drive of the fixing plate 42, and at the same time compresses the fourth elastic member 46 to accumulate restoring force; when the sliding arc surface 433 on the locking member 43 moves to the position contacting the inclined surface of the block 351 on the second telescopic arm 35, the locking member 43 is released from the engagement with the inclined surface of the block 351 and the sliding arc surface 433. The first telescopic arm 33 and the second telescopic arm 35 begin to retract into the main shell 11 under the action of the restoring force of the first elastic member 36 and the second elastic member 37 respectively. At the same time, the locking member 43 returns to the initial position under the action of the restoring force of the fourth elastic member 46. At this time, the movable end of the movable link 44 also slides to the initial position in the guide groove 432. After the first telescopic arm 3 and the second telescopic arm 35 complete the retraction operation, they synchronously drive the two latch rods 500 to retract from the corresponding latch holes 201 to the auxiliary door leaf 300 or to be flush with the horizontal plane of the auxiliary door leaf 300, so that the auxiliary door leaf 300 opens simultaneously with the main door leaf 400, thereby realizing the automatic opening operation of the auxiliary door leaf 300.

[0050] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0051] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A latch mechanism, characterized in that: include: Shell assembly; A connecting rod assembly, comprising a connecting rod body and a torsion spring which are connected in a transmission manner, wherein the connecting rod body and the torsion spring are sequentially arranged on a positioning column in the housing assembly; A transmission assembly is disposed throughout the housing assembly, and the connecting rod assembly can drive the transmission assembly to move, thereby realizing a manual locking function of the auxiliary door leaf; An unlocking assembly, which is movably arranged in the housing assembly and can be detachably engaged with the transmission assembly, and the unlocking assembly and the transmission assembly can realize the automatic unlocking function of the auxiliary door leaf; The transmission assembly includes a first telescopic arm and a second telescopic arm, which are respectively movable and penetrate the opposite sides of the housing assembly; a clamping block is fixedly provided on the second telescopic arm, and the clamping block can be detachably engaged with the unlocking assembly, and a contact portion between the clamping block and the unlocking assembly is provided with an inclined surface; Among them, the unlocking component includes a pressing piece, which movably passes through the shell component; a fixing plate fixedly arranged on the pressing piece; a locking piece movably passed through the pressing piece and capable of being detachably engaged with the blocking block; a movable connecting rod with one end fixedly connected to the fixing plate and the other end slidably arranged on the locking piece; a third elastic piece passing through the pressing piece and arranged between the pressing piece and the guide plate; and a fourth elastic piece passing through the pressing piece and arranged between the fixing plate and the locking piece.

2. A latch mechanism according to claim 1, characterized in that: The transmission assembly also includes a lever gear, a first transmission gear, a second transmission gear, a first elastic member and a second elastic member; the lever gear is rotatably arranged in the shell assembly and can be contacted and connected with the connecting rod assembly; the first transmission gear is rotatably arranged in the shell assembly and is meshed and transmission-connected with the lever gear; the first telescopic arm is transmission-connected with the first transmission gear; the second transmission gear is rotatably arranged in the shell assembly and is transmission-connected with the first telescopic arm; the second telescopic arm is transmission-connected with the second transmission gear; the two ends of the first elastic member are respectively connected to the shell assembly and the first telescopic arm; the two ends of the second elastic member are respectively connected to the shell assembly and the second telescopic arm.

3. A latch mechanism according to claim 2, characterized in that: A first rack and a second rack are respectively arranged on opposite sides of the first telescopic arm. The first rack is meshed and transmission-connected with the first transmission gear, and the second rack is meshed and transmission-connected with the second transmission gear.

4. A latch mechanism according to claim 1, characterized in that: The locking member is provided with a guide slot, and one end of the movable connecting rod is slidably arranged in the guide slot.

5. A latch mechanism according to claim 1, characterized in that: Sliding arc surfaces are respectively arranged on the two sides of the locking member contacting the clamping block, and the sliding arc surfaces cooperate with the inclined surface of the clamping block.

6. A latch mechanism according to claim 2, characterized in that: A third rack is arranged on the same side of the second telescopic arm and the clamping block, and the third rack is meshed and transmission-connected with the second transmission gear.

7. A latch mechanism according to claim 1, characterized in that: The connecting rod body comprises an integrally formed connecting head, a connecting rod short end and a connecting rod long end. The connecting rod short end and the connecting rod long end are arranged on the same straight line and are respectively arranged at two ends of the connecting head.

8. A latch mechanism according to claim 1, characterized in that: The shell assembly comprises a fixed panel and a main shell, wherein the main shell is fixedly mounted on the side of the fixed panel; and a cover plate is fixedly arranged on the main shell.

9. A latch mechanism according to claim 8, characterized in that: A plurality of positioning columns and guide plates are fixedly arranged on the main inner wall of the main shell, and the pressing member movably penetrates the guide plates; a guide block is fixedly arranged on the side inner wall of the main shell, and the second telescopic arm can be slidably connected relative to the guide block.

10. A double door, characterized in that: A latch mechanism comprising any one of claims 1 to 9; It also includes a door frame, an auxiliary door leaf, a main door leaf and two latch rods; The door frame is the supporting body; the auxiliary door leaf and the main door leaf are respectively rotatably connected to the door frame and can be relatively opened or closed; the latch mechanism is fixedly arranged on the auxiliary door leaf and its pressing piece can be elastically contacted and connected with the main door leaf; the two latch rods are respectively movably arranged in the auxiliary door leaf and are respectively transmission-connected with the first telescopic arm and the second telescopic arm in the latch mechanism.

Images