A latch mechanism and double door

Abstract

The application discloses a latch mechanism and a double-leaf door, and the latch mechanism comprises a housing assembly and a connecting rod assembly; the connecting rod assembly comprises a connecting rod main body and a torsion spring which are in transmission connection; a transmission assembly is arranged through the housing assembly and comprises a first telescopic arm and a second telescopic arm, and a clamping block is fixedly arranged on the second telescopic arm; an unlocking assembly is movably arranged through the housing assembly and comprises a pressing piece; a fixed sheet is fixedly arranged on the pressing piece; a locking piece is movably arranged on the pressing piece and can be detachably connected with the clamping block; a movable connecting rod is fixedly connected to the fixed sheet and is slidably arranged on the locking piece; a third elastic piece is arranged between the pressing piece and the fixed sheet; and a fourth elastic piece is arranged between the fixed sheet and the locking piece. The application can realize the functions of manual locking and automatic opening of a secondary door respectively, and effectively solves the problem that the existing secondary door cannot be automatically opened when a primary door is opened.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of hardware fittings, in particular to a latch mechanism and a double-leaf door. BACKGROUND

[0002] With the development of society and the continuous improvement of living standards, people's requirements for fire safety of entry doors are getting higher and higher. The new standard GB12955-2024 "Fire Door" has been issued and will be implemented formally on May 1, 2026. In the new standard of fire door, it is clearly required that "the latch of the fire door installed in the evacuation passage should be automatically opened when the door leaf is opened". There are many types of latches on the market, but there are few automatic latches. The existing automatic latches are generally split latches, one on the upper head and one on the lower head of one door, which can only be used for indoor wooden doors and cannot be used for entry doors. Moreover, this type of automatic latch cannot meet the user's requirement of closing the secondary door leaf alone, and the latch can only be passively locked when the two door leaves of the double-leaf door are closed. Therefore, there is an urgent need to develop a new type of automatic latch to meet the potential market demand. In order to meet the requirements of the new standard of fire door and the practical needs of users using double-leaf security doors and fire doors, a latch mechanism and a double-leaf door are provided to solve the above problems. SUMMARY

[0003] One of the purposes of the present application is to provide a latch mechanism and a double-leaf door to solve the problem that the existing secondary door leaf cannot be automatically opened when the main door leaf is opened.

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

[0005] The latch mechanism of the present application comprises a housing assembly, a connecting rod assembly comprising a connecting rod body and a torsion spring connected in transmission, the connecting rod body and the torsion spring being arranged in sequence on a positioning column in the housing assembly, a transmission assembly being arranged in transmission in the housing assembly, the connecting rod assembly being capable of driving the transmission assembly to move to realize the manual locking function of the secondary door leaf, and an unlocking assembly being movably arranged in transmission in the housing assembly and being capable of detachable clamping connection with the transmission assembly, the unlocking assembly and the transmission assembly being capable of realizing the automatic unlocking function of the secondary door leaf.

[0006] The transmission assembly comprises a first telescopic arm and a second telescopic arm, both of which are movably arranged in transmission on opposite sides of the housing assembly. The second telescopic arm is fixedly provided with a clamping block, the clamping block being capable of detachable clamping connection with the unlocking assembly, and the contact part of the clamping block and the unlocking assembly is provided with an inclined surface.

[0007] The unlocking assembly comprises a pressing piece movably penetrating the shell assembly, a fixed sheet fixed on the pressing piece, a locking piece movably penetrating the pressing piece and capable of being detachably connected with the clamping block, an active connecting rod with one end fixedly connected with the fixed sheet and the other end slidingly arranged on the locking piece, a third elastic piece penetrating the pressing piece and arranged between the pressing piece and the guide sheet, and a fourth elastic piece penetrating the pressing piece and arranged between the fixed sheet and the locking piece.

[0008] In one embodiment, the transmission assembly further comprises a dial gear, a first transmission gear, a second transmission gear, a first elastic piece and a second elastic piece; the dial gear is rotationally arranged in the shell assembly and capable of being in contact with the connecting rod assembly; the first transmission gear is rotationally arranged in the shell assembly and in meshing transmission connection with the dial gear; the first telescopic arm is in transmission connection with the first transmission gear; the second transmission gear is rotationally arranged in the shell assembly and in transmission connection with the first telescopic arm; the second telescopic arm is in transmission connection with the second transmission gear; the two ends of the first elastic piece are respectively connected with the shell assembly and the first telescopic arm; the two ends of the second elastic piece are respectively connected with the shell assembly and the second telescopic arm.

[0009] In one embodiment, the first telescopic arm is provided with a first rack and a second rack on opposite sides thereof respectively, the first rack is in meshing transmission connection with the first transmission gear, and the second rack is in meshing transmission connection with the second transmission gear.

[0010] In one embodiment, the locking piece is provided with a guide sliding groove, and one end of the active connecting rod is slidingly arranged in the guide sliding groove.

[0011] In one embodiment, the two sides of the locking piece in contact with the clamping block are respectively provided with sliding arc surfaces, and the sliding arc surfaces are matched with the inclined surfaces of the clamping block.

[0012] In one embodiment, the second telescopic arm is provided with a third rack on the same side as the clamping block, and the third rack is in meshing transmission connection with the second transmission gear.

[0013] In one embodiment, 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 line and respectively arranged at the two ends of the connecting head.

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

[0015] In one of the embodiments, a plurality of positioning columns and guide pieces are respectively fixed on the main inner wall of the main shell, and the pressing piece is movably penetrated through the guide pieces; a guide block is fixed on the side inner wall of the main shell, and the second telescopic arm is slidably connected relative to the guide block.

[0016] The double-door includes the bolt mechanism of any one of the above;

[0017] The double-door further includes a door frame, a secondary door leaf, a main door leaf and two bolt rods;

[0018] The door frame is a support body; the secondary door leaf and the main door leaf are respectively rotatably connected to the door frame and can be opened or closed relative to each other; the bolt mechanism is fixed on the secondary door leaf and the pressing piece thereof is elastically connected to the main door leaf; the two bolt rods are movably penetrated through the secondary door leaf and are respectively in transmission connection with the first telescopic arm and the second telescopic arm of the bolt mechanism.

[0019] Compared with the prior art, the bolt mechanism and the double-door have the following beneficial effects:

[0020] When the main door leaf is opened, the compression force acting on the pressing piece disappears, and the fixed piece, the movable connecting rod and the locking piece are sequentially driven to move under the restoring force of the elastic piece, so that the locking piece releases the clamping connection with the clamping block, and the two telescopic arms move under the restoring force of the elastic piece, thereby realizing the automatic opening operation of the secondary door leaf, effectively solving the problem that the existing secondary door leaf cannot be automatically opened following the opening of the main door leaf; at the same time, the two telescopic arms are extended to drive the two bolt rods to extend into the corresponding bolt holes, and the clamping block moves to be clamped with the locking piece, thereby completing the manual locking operation of the secondary door leaf. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor.

[0022] Figure 1 is a structural schematic view of the bolt mechanism in a first use state of the present application;

[0023] Figure 2is a structure schematic view of a second use state of the latch mechanism of the present application;

[0024] Figure 3 is a structure schematic view of a third use state of the latch mechanism of the present application;

[0025] Figure 4 is an exploded structure schematic view of the latch mechanism of the present application, comprising a main shell, a connecting rod main body, a second telescopic arm, a pressing piece and a locking piece;

[0026] Figure 5 is a structure schematic view of the main shell shown in the figure; Figure 4

[0027] Figure 6 is a structure schematic view of the connecting rod main body shown in the figure; Figure 4

[0028] Figure 7 is a structure schematic view of the second telescopic arm shown in the figure; Figure 4

[0029] Figure 8 is a structure schematic view of the pressing piece shown in the figure; Figure 4

[0030] Figure 9 is a structure schematic view of the locking piece shown in the figure; Figure 4

[0031] Figure 10 is a structure schematic view of a double-leaf door of the present application.

[0032] ​​​​​Indicated in the figure: 100, latch mechanism; 10, housing assembly; 11, fixed panel; 111, connecting rod slot; 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 piece; 13, cover plate; 20, connecting rod assembly; 21, connecting rod main 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 main body; 32, first transmission gear; 33, first telescopic arm; 331, first rack; 332, second rack; 333, first hook; 34, second transmission gear; 35, second telescopic arm; 351, clamping block; 352, third rack; 353, second hook; 354, guide slot; 36, first elastic member; 37, second elastic member; 40, unlocking assembly; 41, pressing piece; 411, connecting shaft; 4111, clamping slot; 412, pressing head; 42, fixed piece; 43, locking piece; 431, connecting shaft hole; 432, guide sliding slot; 433, sliding arc surface; 44, movable connecting rod; 45, third elastic member; 46, fourth elastic member; 200, door frame; 201, latch hole; 300, secondary door leaf; 400, primary door leaf; 500, latch rod. DETAILED DESCRIPTION

[0033] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some but not all of the embodiments of the present application. The components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0034] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative labor are within the scope of protection of the present application.

[0035] Please refer to Figures 1-10As shown, the latch mechanism 100 mainly comprises a housing assembly 10, a connecting rod assembly 20, a transmission assembly 30 and an unlocking assembly 40; the housing assembly 10 is a hollow cavity, which is fixedly arranged on the secondary door leaf 200; the connecting rod assembly 20 is movably arranged through the side of the housing assembly 10; the transmission assembly 30 is movably arranged through the housing assembly 10, and the connecting rod assembly 20 can be in contact with the transmission assembly 30 to drive the transmission assembly 30 to drive the 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 secondary door leaf 300; the unlocking assembly 40 is movably arranged through the housing assembly 10 and can be in contact with the transmission assembly 30, thereby driving the transmission assembly 30 to drive the two latch rods 500 to retract from the corresponding latch holes 201, thereby realizing the automatic unlocking function of the secondary door leaf 300.

[0036] As shown in the drawings, Figures 1-4 As shown in the drawings, in the embodiment, the housing assembly 10 comprises 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 secondary door leaf 300, the connecting rod assembly 20 is movably arranged through the fixed panel 11, and the unlocking assembly 40 is movably arranged through 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 through the main housing 12; the cover plate 13 is fixedly arranged on the main housing 12. Specifically, the fixed panel 11 is movably arranged through the connecting rod slot 111, the positioning hole 112, the plurality of mounting holes 113 and the plurality of first fixing holes 114, respectively; the connecting rod assembly 20 is movably arranged through the fixed panel 11 through the connecting rod slot 111, the unlocking assembly 40 is movably arranged through the fixed panel 11 through the positioning hole 112, the fixed panel 11 is fixedly arranged on the side of the secondary door leaf 300 through the plurality of mounting holes 113, and the main housing 12 is fixedly arranged on the fixed panel 11 through the plurality of first fixing holes 114.

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

[0038] As shown in Figure 4 and Figure 6 As shown in the 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 drivingly connected and arranged on the corresponding positioning columns 122 in turn, the torsion spring 22 provides a restoring force for the connecting rod body 21, so that the connecting rod body 21 returns to an 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 movably arranged through the fixed panel 11 through the connecting rod groove 111. 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 on 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 the two 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] As shown in Figures 1-4As shown, in the embodiment, the transmission assembly 30 comprises 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, the connecting rod body 21 can be in contact with the lever gear 31 to drive the lever gear 31 to rotate; the first transmission gear 32 is rotatably arranged on the corresponding positioning column 122 and is in meshing transmission connection with the lever gear 31, the lever gear 31 drives the first transmission gear 32 to rotate on the corresponding positioning column 122; the first telescopic arm 33 is movably penetrated through the side edge of the main shell 12 through the corresponding through hole 123 and is in transmission connection with the first transmission gear 32, the first transmission gear 32 can drive the first telescopic arm 33 to move relative to the main shell 12, so as to drive the corresponding bolt rod 500 to extend into the bolt hole 201 or retract from the bolt hole 201; the second transmission gear 34 is rotatably arranged on the corresponding positioning column 122 and is in transmission connection 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 is movably penetrated through the side edge of the main shell 12 through the corresponding through hole 123 and is in transmission connection 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, so as to drive the corresponding bolt rod 500 to extend into the bolt hole 201 or retract from the bolt hole 201, the unlocking assembly 40 can detachably clasp connect the second telescopic arm 35, so as to simultaneously lock the first telescopic arm 33 and the second telescopic arm 35; 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, the lever gear 31 is fixedly provided with a lever body 311, the connecting rod body 21 can be in contact with the lever body 311 to drive the lever gear 31 to rotate; the first elastic member 36 and the second elastic member 37 are springs.

[0040] Please refer to Figure 4 Specifically, the first telescopic arm 33 is provided with a first rack 331 and a second rack 332 on the opposite sides thereof, the first rack 331 is in meshing transmission connection with the first transmission gear 32, and the second rack 332 is in meshing transmission connection with the second transmission gear 34; the first telescopic arm 33 is further fixedly provided with a first clasp 333, and one end of the first elastic member 36 is connected to the first clasp 333.

[0041] Please refer to Figure 4 and Figure 7As shown, specifically, the second telescopic arm 35 is fixedly provided with a clamping block 351, which can be detachably clamped and connected with the unlocking assembly 40, and a slope is arranged at the contact position of the clamping block 351 and the unlocking assembly 40; a third gear rack 352 is arranged on the same side of the second telescopic arm 35 as the clamping block 351, and the third gear rack 352 is in meshing transmission connection with the second transmission gear 34; a second clamping hook 353 is further arranged on the second telescopic arm 35, and one end of the second elastic member 37 is connected to the second clamping hook 353; a guide groove 354 is arranged on the side of the second telescopic arm 35 opposite to the third gear rack 352, and the guide block 124 is arranged 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] As shown in Figures 1-4 As shown in the embodiment, the unlocking assembly 40 includes a pressing member 41, a fixed sheet 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 is movably penetrated through the fixed panel 11 into the main shell 12 through the positioning hole 112 and movably penetrates through the guide sheet 126; the fixed sheet 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 arranged on the pressing member 41 and can be detachably clamped and connected with the clamping block 351; one end of the movable connecting rod 44 is fixedly connected to the fixed sheet 42, and the other end is slidably arranged on the locking member 43; the third elastic member 45 is arranged on the pressing member 41 and between the pressing member 41 and the guide sheet 126, and provides a restoring force to the pressing member 41; the fourth elastic member 46 is arranged on the pressing member 41 and between the fixed sheet 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] As shown in 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 penetrates through the third elastic member 45, the guide sheet 126, the fixed sheet 42, the fourth elastic member 46 in sequence and extends into the locking member 43; the pressing head 412 is fixedly arranged on one side of the connecting shaft 411 and movably penetrates through the fixed panel 11 through the positioning hole 112.

[0044] As shown in Figure 4 and Figure 9As shown, specifically, the locking piece 43 is provided with a connecting shaft hole 431 penetratingly arranged thereon, and the connecting shaft 411 is movably and penetratingly arranged in the connecting shaft hole 431; the locking piece 43 is provided with a guide sliding groove 432, one end of the movable connecting rod 44 is slidingly arranged in the guide sliding groove 432, and the guide sliding groove 432 guides and limits the movement of the movable connecting rod 44; the two sides of the locking piece 43 in contact with the clamping block 351 are respectively provided with sliding arc surfaces 433, so as to facilitate the cooperation with the inclined surface of the clamping block 351.

[0045] As shown in the drawings, Figure 10 As shown, the double-door of the present application comprises the above-mentioned any one of the latch mechanism 100, the door frame 200, the secondary door leaf 300, the main door leaf 400 and the two latch rods 500; the door frame 200 is a supporting body; the secondary 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 secondary door leaf 300 and can be elastically and contactingly connected with the main door leaf 400; the two latch rods 500 are respectively movably and penetratingly arranged in the secondary door leaf 300 and are respectively in transmission connection with the first telescopic arm 33 and the second telescopic arm 35 in the latch mechanism 100, 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, so as to realize the opening or locking operation of the secondary door leaf 300.

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

[0047] When the main door leaf 400 is opened and the secondary door leaf 300 needs to be manually locked, 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 compression force of the torsion spring 22, and the long end 213 of the connecting rod is rotated out of the connecting rod groove 111, and then the long end 213 of the connecting rod is held by hand and rotated outwardly, driving the short end 212 of the connecting rod to rotate inwardly and drive the shifting lever gear 31 to rotate, which in turn drives the first transmission gear 32, the first telescopic arm 33, the second transmission gear 34, and the second telescopic arm 35 to move, so that the first telescopic arm 33 and the second telescopic arm 35 are simultaneously extended out of the shell assembly 10, and the two plug rods 500 are driven by the first telescopic arm 33 and the second telescopic arm 35 to extend into the corresponding plug holes 201; while the second telescopic arm 35 is extended outwardly, the inclined surface of the clamping block 351 moves with the second telescopic arm 35, so as to contact the sliding arc surface 433 on one side of the locking member 43, so that the locking member 43 is forced to move towards the fixed panel 11 and compresses the fourth elastic member 46, and the fourth elastic member 46 accumulates restoring force; when the clamping block 351 moves past the locking member 43 with the second telescopic arm 35, the locking member 43 returns to the initial position under the restoring force of the fourth elastic member 46, thereby clamping the clamping block 351, so that the extension positions of the first telescopic arm 33 and the second telescopic arm 35 are fixed, and the manual locking operation of the secondary door leaf 300 is completed, and at the same time, the first telescopic arm 33 and the second telescopic arm 35 stretch the first elastic member 36 and the second elastic member 37 respectively, so that the first elastic member 36 and the second elastic member 37 accumulate 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 the connecting rod body 21 will not be loose under the compression force of the torsion spring 22.

[0048] When the secondary door leaf 300 is locked and the main door leaf 200 is closed, the anti-scratch piece on the side of the main door leaf 200 touches the arc surface of the pressing head 412 of the pressing member 41, pushing the pressing member 41 to retract into the main shell 12, and at this time the main door leaf 200 is normally closed; when the pressing member 41 retracts, the connecting shaft 411 also moves in the direction of the main shell 12, and the third elastic member 45 is compressed against the back of the pressing head 412; the fixed piece 42 also moves inwardly with the fourth elastic member 46 under the driving of the connecting shaft 411, and the movable connecting rod 44 moves to the farthest end of the guide sliding groove 432 under the driving of the fixed piece 42.

[0049] When the main door leaf 200 is opened, the external force acting on the pressing head 412 disappears, the pressing head 412 moves outward under 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 fixed plate 42 to move in the direction of the fixed panel 11, the movable connecting rod 44 is driven by the fixed plate 42 to move in the direction of the fixed panel 11 at the same time, and the locking member 43 is compressed to accumulate the restoring force of the fourth elastic member 46; when the sliding arc surface 433 on the locking member 43 moves to the position of contacting the inclined surface of the clamping block 351 on the second telescopic arm 35, through the cooperation of the inclined surface of the clamping block 351 and the sliding arc surface 433, the locking member 43 is disconnected with the clamping block 351, the first telescopic arm 33 and the second telescopic arm 35 are respectively retracted into the main housing 11 under the restoring force of the first elastic member 36 and the second elastic member 37, and the locking member 43 returns to the initial position under the restoring force of the fourth elastic member 46, at this time, the movable end of the movable connecting rod 44 also slides to the initial position in the guide sliding groove 432, and the first telescopic arm 33 and the second telescopic arm 35 complete the retraction operation, and synchronously drive the two bolt rods 500 to retract into the secondary door leaf 300 or be flush with the horizontal plane of the secondary door leaf 300, so that the secondary door leaf 300 is opened at the same time with the main door leaf 400, and the automatic opening operation of the secondary door leaf 300 is realized.

[0050] Any combination of the technical features in the above-described embodiments can be made, and to make the description simple, all possible combinations of the technical features in the embodiments are not described, however, as long as the combination of the technical features does not exist contradictory, it should be considered that it is within the scope of the description.

[0051] The above-described embodiments only express several implementation manners of the present application, the description is more specific and detailed, but it should not be understood as the limitation of the patent scope of the present application. It should be pointed out that, for ordinary skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are within the protection scope of the present application. Therefore, the patent protection scope of the present application should be subject to the appended claims.

Claims

1. A latch mechanism, characterized in that: include: housing assembly; A connecting rod assembly comprising a connecting rod body and a torsion spring in transmission connection, wherein the connecting rod body and the torsion spring are sequentially arranged on a positioning column in the housing assembly; A transmission assembly is provided through 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 movable and extend through 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. The contact portion between the clamping block and the unlocking assembly is provided with an inclined surface. Wherein, the housing assembly includes a fixed panel and a main housing fixedly mounted on the side of the fixed panel, and a guide piece is fixedly provided on the main inner wall of the main housing; In which, the unlocking component includes a pressing piece, which movably passes through the guide piece; a fixing piece fixedly arranged on the pressing piece; a locking piece movably passed through the pressing piece, which can be detachably engaged with the blocking block; a movable connecting rod with one end fixedly connected to the fixing piece, and the other end of which is slidably arranged on the locking piece; a third elastic piece passing through the pressing piece and arranged between the pressing piece and the guide piece; and a fourth elastic piece passing through the pressing piece and arranged between the fixing piece and the locking piece.

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

3. A latch mechanism according to claim 2, characterized in that: A first rack and a second rack are respectively provided on opposite sides of the first telescopic arm. The first rack is meshed and connected to the first transmission gear, and the second rack is meshed and connected to 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. The latch mechanism according to claim 1, wherein: 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.

6. A latch mechanism according to claim 2, characterized in that: 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.

7. The latch mechanism according to claim 1, wherein: The connecting rod body includes 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. The latch mechanism according to claim 1, wherein: The housing assembly further includes a cover plate, which is fixedly arranged on the main housing.

9. The latch mechanism according to claim 8, characterized in that: A plurality of positioning columns are fixedly provided on the main inner wall of the main shell; 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.

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

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