CN210888431U

CN210888431U - Mortise lock body

Info

Publication number: CN210888431U
Application number: CN201921219313.0U
Authority: CN
Inventors: 林金伦; 林柳成; 陈浩权
Original assignee: Zhejiang Qingtaiheng Technology Co ltd
Current assignee: Zhejiang Qingtaiheng Technology Co ltd
Priority date: 2019-07-30
Filing date: 2019-07-30
Publication date: 2020-06-30
Anticipated expiration: 2029-07-30

Abstract

The utility model relates to the technical field of lock body accessories, and discloses a mortise lock body, which comprises a shell, and a peach-poking component, a latch bolt and a square bolt which are positioned in the shell, wherein the latch bolt and the square bolt are respectively matched with the peach-poking component; the shell is internally provided with a linkage device, the linkage device comprises a clutch rod movably connected to the middle square core, the upper square core, the lower square core and the middle square core are matched to form a slot, and the clutch rod is inserted into the slot. The utility model has the advantages of it is following and effect: when the clutch lever is connected to the middle square core, the upper square core, the lower square core and the middle square core move independently, at the moment, the movement of the upper square core or the lower square core only can drive the latch bolt to move, and the latch bolt is in a locking state; when the clutch lever is inserted into the slot, the upper square core, the lower square core and the middle square core are linked, so that unlocking of the square tongue can be realized, and the requirement that the door can be opened after unlocking is required inside and outside the door is met.

Description

Mortise lock body

Technical Field

The utility model belongs to the technical field of the technique of lock body accessory and specifically relates to a lock pin lock body is related to.

Background

The lock body is one of the components of the lock, and the lock body has a plurality of types, such as a one-way lock body, a three-way lock body, a four-way lock body and the like. The lock is generally used on a security door and is responsible for basic security work of the security door, the lock cylinder controls the operation of the lock body, and the lock body is responsible for unlocking and locking the door and the window, thereby playing an important role in security.

At present, a patent with publication number CN2642938Y discloses an external lifting and internal pressing type mortise lock body, which comprises a shell, an internal shift peach, an external shift peach and a square tongue plate, wherein the internal shift peach and the external shift peach are coaxially arranged in the shell, the square tongue plate is arranged beside the internal shift peach and the external shift peach, a locking groove is arranged at one side of the square tongue plate, a push-pull plate is arranged between the internal shift peach and the external shift peach, and a hook head is arranged on the internal shift peach and is positioned at one side of a push-pull hook; the outer shifting peach is provided with a push nail which is positioned at the other side of the push-pull hook; the locking groove on the square tongue plate is in a sawtooth shape.

However, the lock body in the prior art can be opened by pressing down the handle in the door, but in some specific environments with higher safety factor requirements, the lock body can be opened only after being unlocked in and out of the door, and obviously, the door lock can not meet the requirements and needs to be improved.

SUMMERY OF THE UTILITY MODEL

The utility model provides a lock pin lock body, can satisfy the application under the higher condition of factor of safety requirement to the not enough of prior art existence.

In order to achieve the above purpose, the utility model provides a following technical scheme:

a lock body with a lock core comprises a shell, and a peach pulling assembly, an inclined bolt and a square bolt which are positioned in the shell, wherein the inclined bolt and the square bolt are respectively matched with the peach pulling assembly; the shell is internally provided with a linkage device, the linkage device comprises a clutch lever movably connected to the middle square core, the upper square core, the lower square core and the middle square core are matched to form a slot, and the clutch lever is inserted into the slot.

By adopting the technical scheme, when the clutch lever is connected to the middle core, the upper core, the lower core and the middle core move independently, at the moment, the door handle can be pressed down from the inside and the outside of the door only through the upper core or the lower core to drive the latch bolt to move, and the latch bolt is in a locking state; when the clutch lever is inserted into the slots at the corresponding positions of the upper core, the lower core and the middle core, the upper core, the lower core and the middle core are linked, the door handle is pressed down from the inside or the outside of the door to unlock the square tongue, and the requirement of the door under the environment with higher safety coefficient for opening the door after the door is unlocked inside and outside the door is met.

The utility model discloses further set up to: the linkage device further comprises a motor, a guide rod and a movable frame, wherein a fixed seat is fixed on one side, located on the middle square core, in the shell, the motor is installed in the fixed seat, a driving gear is fixed on the motor, a sliding frame is movably connected to the fixed seat, the guide rod penetrates through the sliding frame, and a driven gear meshed with the driving gear is fixed on the guide rod; the guide rod is fixedly provided with a positioning shaft, the guide rod is sleeved with a spring, and the positioning shaft penetrates through the gap of the spring; the movable frame is fixed on the outer side of the sliding frame and can be used for the clutch rod to slide.

By adopting the technical scheme, the driving gear on the motor is meshed with the driven gear on the guide rod, the guide rod is connected with the sliding frame, the positioning shaft on the guide rod penetrates through the gap of the spring sleeved on the guide rod, when the motor drives the guide rod to rotate, the spring is contracted or stretched along with the rotation of the positioning shaft, when the spring is stretched, the clutch rod can be inserted into the slot, and when the spring is contracted, the clutch rod is connected to the middle core and separated from the upper core and the lower core; the movable frame outside the sliding frame is used for the clutch rod to slide, so that the clutch rod can move in cooperation with the rotation of the square core, and the structure is more reasonable.

The utility model discloses further set up to: an open slot is formed on the side wall of the middle square core corresponding to the slot, a connecting block is fixed in the open slot, and the clutch lever is bent and sleeved on the connecting block; a push plate is fixed on the side wall of the middle square core, a matching plate is formed on the upper square core and the lower square core corresponding to one side of the push plate and opposite to the push plate, a movable opening is formed on the side wall of the middle square core and between the matching plate and the push plate, a return lifting piece is rotatably connected in the shell, one end of the return lifting piece is bent and is provided with a drive plate accommodated in the movable opening, and the matching plate and the push plate can be respectively abutted against the drive plate; the return lifting piece drives the dead bolt through the connecting structure.

By adopting the technical scheme, the connecting block in the open slot on the middle square core can be correspondingly sleeved with the clutch lever, so that the purpose of positioning the clutch lever is achieved; the corresponding matching plates on the upper core and the lower core and the push plates on the side walls of the middle core are respectively positioned at two ends of the drive plate on the back lifting plate and can push the drive plate forward and backward; the movable port provides space for the movement of the driving plate; the lifting piece connected in the shell can drive the movement of the square tongue, so that the movement of the middle square core can drive the movement of the square tongue.

The utility model discloses further set up to: the connecting structure comprises a rotating sleeve and a connecting plate, the rotating sleeve is rotatably connected in the shell, an extending seat is fixedly arranged on the rotating sleeve, a matching cavity is formed in the extending seat, a clamping opening is formed at the other end of the returning lifting piece, the side wall of the extending seat is clamped by the clamping opening and is movably connected in the matching cavity, the connecting plate is fixedly connected with the square tongue and is slidably arranged in the shell, and the extending plate matched with the connecting plate is fixedly arranged on the side wall of the rotating sleeve.

By adopting the technical scheme, the extension seat on the rotary sleeve is matched with the clamping port of the return lifting piece, the rotation of the return lifting piece can drive the rotary sleeve to rotate, and the extension plate on the rotary sleeve is matched with the connecting plate, so that the rotation of the extension plate can drive the connecting plate to move, and the control of the square tongue is realized.

The utility model discloses further set up to: the two sides of the middle square core are respectively provided with a matching groove, and the upper square core and the lower square core are respectively positioned in the corresponding matching grooves; the upper core and the upper core are both fixed with square chips, the latch tongue is fixed with a pull rod positioned in the shell, the pull rod is fixed with a positioning piece, the square chips are extended to form a linkage plate, the middle square core is extended to form a butt plate, and the linkage plate and the butt plate can be butted against the positioning piece; the matching plates are respectively formed on the square chips corresponding to the upper chip and the lower chip.

By adopting the technical scheme, the matching groove on the middle square core provides an installation space for the upper core and the lower core; the linkage plate on the square chip can abut against the positioning piece on the pull rod of the latch bolt, so that the movement of the latch bolt can be controlled through the upper core and the lower core; the square tongue is driven to move when the abutting plate on the middle square chip abuts against the positioning sheet; the matching plate is respectively formed on the square chips corresponding to the upper chip and the lower chip, so that the structure is more reasonable.

The utility model discloses further set up to: a waist-shaped hole is formed in the connecting plate, a positioning nail is fixed between the connecting plate and the back lifting piece in the shell, the positioning nail penetrates through the waist-shaped hole, and the connecting plate abuts against the positioning nail; and a sleeve abutting against the connecting plate is fixed on the positioning nail.

By adopting the technical scheme, the connecting plate can move relative to the positioning nail through the waist-shaped hole on the connecting plate, and the connecting plate is stably installed on the positioning nail through the sleeve, so that the moving process of the connecting plate is more stable; the movement of the connecting plate can drive the movement of the dead bolt, thereby realizing the locking and unlocking of the dead bolt.

The utility model discloses further set up to: the utility model discloses a nail fixing device, including extension board, be equipped with the cooperation nail that can slide on even board, be close to location nail department on the casing and be fixed with the staple, wear to be equipped with the cooperation nail that can slide on even board on the extension board, the staple corresponds the department with the cooperation nail and is equipped with the pressure spring, the pot head of pressure spring is located the staple, and other pot head is located the cooperation nail.

Through adopting above-mentioned technical scheme, the cover is equipped with the both ends of pressure spring respectively on staple and the cooperation nail on the casing, and the staple is fixed on the casing, and the cooperation nail can slide even board relatively, can drive the automatic re-setting of the cooperation nail after the removal from this.

The utility model discloses further set up to: the shell is internally fixed with a back lifting nail, the back lifting piece penetrates through the back lifting nail, a ring is formed on the driving plate, and the ring is sleeved on the back lifting nail.

By adopting the technical scheme, the back lifting nail fixed in the shell penetrates through the back lifting piece, so that the back lifting piece can rotate in the direction of the axis of the back lifting nail; the ring on the back lifting nail realizes the stable connection of the back lifting piece on the back lifting nail, and the back lifting plate and the ring can synchronously rotate by taking the back lifting nail as the axis direction, so that the rotation process of the back lifting plate is more stable.

The utility model discloses further set up to: a sliding block is formed on the positioning sheet, and a sliding hole for the sliding block to slide is formed in the shell.

Through adopting above-mentioned technical scheme, the slider on the spacer is slided and is located the hole of sliding on the casing, and the process of sliding of supplementary spacer, the structure is more reasonable.

To sum up, the utility model discloses following beneficial effect has:

1. when the clutch lever is connected to the middle square core, the upper square core, the lower square core and the middle square core move independently, at the moment, the movement of the upper square core or the lower square core only can drive the latch bolt to move, and the latch bolt is in a locking state; when the door is opened, a corresponding signal is respectively sent to the motor through a coded lock or an information card and the like arranged on the lock body inside and outside the door, the motor works to drive the clutch rod to be inserted into the slot, and the upper core, the lower core and the middle core are linked, so that the unlocking of the square tongue can be realized, and the requirement that the door can be opened only after the door needs to be unlocked inside and outside the door is met;

2. the extension seat on the rotary sleeve is matched with the clamping port of the return lifting piece, the rotation of the return lifting piece can drive the rotary sleeve to rotate, and the extension plate on the rotary sleeve is matched with the connecting plate, so that the rotation of the extension plate can drive the connecting plate to move, and the control of the square tongue is realized.

Drawings

FIG. 1 is a schematic structural view of the present embodiment;

FIG. 2 is a schematic diagram showing the exploded structure of the sliding frame, the upper core, the middle core and the lower core of the present embodiment;

FIG. 3 is a schematic view showing a part of the fitting connection between the positioning plate and the housing according to the present embodiment;

FIG. 4 is a partial schematic view of the cooperative connection of the back lift tab and the rotating sleeve of the present embodiment;

fig. 5 is a partial structure schematic diagram of the matching connection of the dead bolt, the connecting plate and the rotating sleeve of the embodiment.

Reference numerals: 1. a housing; 11. a sliding hole; 2. a peach shifting component; 21. an upper core; 22. a central square core; 221. a mating groove; 222. a butt joint plate; 223. an open slot; 224. connecting blocks; 23. a lower core; 24. a square chip; 241. a linkage plate; 25. a mating plate; 26. pushing the plate; 27. a movable opening; 3. a latch bolt; 31. a pull rod; 32. positioning plates; 321. a slider; 4. a square tongue; 5. a linkage device; 51. a motor; 511. a driving gear; 52. a guide bar; 521. a driven gear; 522. positioning the shaft; 53. a movable frame; 54. a clutch lever; 6. a sliding frame; 7. a slot; 8. returning the extracting sheet; 81. a drive plate; 82. a clamping port; 9. back lifting nails; 10. a loop; 12. a connecting structure; 13. rotating the sleeve; 131. an extension base; 132. a mating cavity; 133. an extension plate; 14. connecting plates; 141. a kidney-shaped hole; 15. positioning nails; 151. a sleeve; 16. fixing nails; 17. a fitting nail; 18. a pressure spring; 19. a fixed seat.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

A mortise lock body is shown in figures 1 and 2 and comprises a shell 1, a peach-shaped component 2, an inclined bolt 3 and a square bolt 4, wherein the peach-shaped component 2, the inclined bolt 3 and the square bolt 4 are positioned in the shell 1, the peach-shaped component 2 comprises an upper core 21, a middle square core 22 and a lower core 23 which are connected with each other, the inclined bolt 3 can be controlled by the movement of the upper core 21 and the lower core 23, and the square bolt 4 can be controlled by the movement of the middle square core 22. A pull rod 31 positioned in the shell 1 is fixed on the latch bolt 3, and two positioning sheets 32 are fixed on the pull rod 31 at intervals.

As shown in fig. 1 and 3, two opposite side walls of the two positioning pieces 32 close to the housing 1 are respectively formed with a sliding block 321, and the housing 1 is respectively formed with a sliding hole 11 for the corresponding sliding block 321 to slide.

As shown in fig. 1 and 2, a linkage device 5 is installed in the housing 1, the linkage device 5 includes a motor 51 and a guide rod 52, a fixing seat 19 is fixed on one side of the housing 1 close to the latch bolt 3, the motor 51 is installed in the fixing seat 19, a sliding frame 6 is installed on one side of the fixing seat 19 located on the motor 51, the sliding frame 6 can move in the fixing seat 19, the guide rod 52 is inserted into the sliding frame 6, and the guide rod 52 is parallel to the extending direction of the pull rod 31.

As shown in fig. 1 and 2, a driving gear 511 is fixed on the motor 51, a driven gear 521 meshed with the driving gear 511 is fixed on the guide rod 52, and when the door is opened, a corresponding signal is given to the motor 51 through a coded lock or an information card arranged on a lock body inside or outside the door, so that the motor 51 drives the driving gear 511 to rotate and drives the driven gear 521 to rotate; the guide rod 52 is fixed with a positioning shaft 522, the guide rod 52 is sleeved with a spring (not shown in the figure), the positioning shaft 522 is arranged in a gap of the spring in a penetrating manner, when the guide rod 52 rotates, the positioning shaft 522 can move along the gap of the spring to realize the contraction or extension of the spring, and therefore the movement of the sliding frame 6 is controlled.

As shown in fig. 1 and 2, the linkage device 5 further includes a movable frame 53 and a clutch lever 54, the movable frame 53 is fixed on the sliding frame 6 and located outside the fixing base 19, the movable frame 53 is an arc frame body, so that the side wall of the movable frame 53 is matched with the circumferential side wall of the middle square core 22, and the clutch lever 54 is inserted into the movable frame 53 and can move along the side wall of the movable frame 53.

As shown in fig. 1 and 2, the upper core 21, the middle core 22 and the lower core 23 are coaxially mounted on the other side of the clutch lever 54, the mating grooves 221 are formed on both sides of the middle core 22, and the upper core 21 and the lower core 23 are respectively positioned in the corresponding mating grooves 221; an open groove 223 is formed on the circumferential side wall of the middle square core 22, a connecting block 224 is fixed in the middle of the open groove 223, and the clutch lever 54 is bent and sleeved on the connecting block 224 to realize the connection of the clutch lever 54 and the middle square core 22.

As shown in fig. 1 and 2, the square core 24 is fixed on each of the upper core 21 and the upper core 21, the linkage plate 241 is formed on the square core 24 in an extending manner, the abutment plate 222 abutting against the positioning plate 32 is formed on the middle square core 22 in an extending manner, and both the linkage plate 241 and the abutment plate 222 can abut against the positioning plate 32 far away from the latch bolt 3.

As shown in fig. 2, the slots 7 are formed at the corresponding positions of the circumferential side walls of the upper core 21, the lower core 23 and the middle core 22, and the slots 7 of the middle core 22 are communicated with the open slot 223, so that the clutch lever 54 can move from the open slot 223 to be inserted into the slots 7, and the synchronous linkage of the upper core 21, the lower core 23 and the middle core 22 is realized.

As shown in fig. 1 and 2, a push plate 26 is fixed on the other side of the circumferential side wall of the middle square core 22 opposite to the abutting plate 222, and a matching plate 25 is formed on the square chip 24 of the upper core 21 and the square chip 24 of the lower core 23 opposite to the push plate 26 and corresponding to one side of the push plate 26; a return lifting piece 8 is rotationally connected in the shell 1, and one end of the return lifting piece 8 is bent upwards corresponding to the side wall of the middle square core 22 to form a driving plate 81; a movable opening 27 for accommodating and moving the driving plate 81 is formed on the side wall of the middle square core 22 and between the matching plate 25 and the push plate 26, and the matching plate 25 and the push plate 26 can respectively abut against the two side walls of the driving plate 81 to realize the forward and reverse movement of the driving plate 81.

As shown in fig. 1, a back lifting nail 9 is fixed on the other side of the upper core 21 opposite to the pull rod 31 in the housing 1, the back lifting piece 8 is inserted into the back lifting nail 9, so that the back lifting piece 8 can rotate around the axis of the back lifting nail 9, a ring 10 is formed on the upper part of the driving plate 81, and the ring 10 is sleeved on the upper part of the back lifting nail 9, so that the process of rotating the back lifting piece 8 around the axis of the back lifting nail 9 is more stable.

As shown in fig. 1 and 4, the return-lift tab 8 drives the tongue 4 via the connecting structure 12. Connection structure 12 is including rotating cover 13 and even board 14, it connects in casing 1 to rotate cover 13, and it is located to return and carries the one end that piece 8 kept away from above core 21 to rotate cover 13, and it is fixed with extension seat 131 to rotate cover 13 and be close to on returning the lateral wall of carrying piece 8, it has cooperation chamber 132 to extend to be formed with in the seat 131, it is formed with centre gripping mouth 82 to return and carries the piece 8 and the relative one end of drive plate 81, centre gripping mouth 82 centre gripping extends the lateral wall and swing joint in cooperation chamber 132 of seat 131, even board 14 and square tongue 4 fixed connection and smooth locate in casing 1, be fixed with on the lateral wall of rotating cover 13 with even board 14 complex extension board 133.

As shown in fig. 1 and 5, a waist-shaped hole 141 extending along the moving direction of the dead bolt 4 is formed on the connecting plate 14, a positioning nail 15 is fixed between the connecting plate 14 and the back-lifting piece 8 in the housing 1, the positioning nail 15 is arranged through the waist-shaped hole 141, and the connecting plate 14 is positioned on the positioning nail 15; a sleeve 151 abutting against the link plate 14 is fixed to the positioning pin 15.

As shown in fig. 1 and 5, a fixing nail 16 is fixed on the casing 1 near the positioning nail 15, a matching nail 17 capable of sliding on the connecting plate 14 penetrates through the extending plate 133, a pressure spring 18 is arranged at a position corresponding to the fixing nail 16 and the matching nail 17, one end of the pressure spring 18 is sleeved on the fixing nail 16, and the other end of the pressure spring is sleeved on the matching nail 17, so that the automatic resetting after the extending plate 133 and the connecting plate 14 move relatively is realized.

The specific operation flow of this embodiment is as follows:

when the square tongue 4 is in the locked state, the door handle is driven from the inside or outside of the door, the corresponding abutting plates 222 on the upper core 21 and the lower core 23 can abut against the positioning plate 32 to drive the oblique tongue 3 to move, but at the moment, the middle core 22 is not linked with the upper core 21 and the lower core 23 and is in the independent state, and the square tongue 4 cannot move and cannot be unlocked.

When the unlocking operation is performed from the inside or outside of the door, firstly, a corresponding signal is given to the motor 51 through a coded lock or an information card and the like arranged on the lock body, the motor 51 works, the rotation of the driving gear 511 drives the driven gear 521 to rotate, so that the guide rod 52 rotates along with the rotation of the driven gear 521, at the moment, the positioning shaft 522 moves along the gap of the spring, the spring is stretched, the sliding frame 6 moves towards one side close to the upper core 21, and the movable frame 53 drives the clutch rod 54 to be inserted into the slot 7 from the open slot 223.

At the moment, the movable frame 53 abuts against the side wall of the middle square core 22, the upper square core 21, the middle square core 22 and the lower square core 23 synchronously move under the matching of the clutch rod 54, the door handle is held and pressed downwards, the abutting plate 222 and the linkage plate 241 abut against the positioning plate 32, the clutch rod 54 slides along the circumferential direction of the side wall of the movable frame 53, the push plate 26 abuts against the side wall of the driving plate 81, the back lifting plate 8 and the ring 10 synchronously rotate by taking the back lifting nail 9 as an axis, the clamping opening 82 drives the extension seat 131 to move, the rotating sleeve 13 is driven to rotate clockwise, the matching nail 17 drives the connecting plate 14, the kidney-shaped hole 141 on the connecting plate 14 is matched with the positioning nail 15 to slide, and the square tongue 4 is contracted to achieve the unlocking purpose.

It is above only the utility model discloses a preferred embodiment, the utility model discloses a scope of protection does not only confine above-mentioned embodiment, the all belongs to the utility model discloses a technical scheme under the thinking all belongs to the utility model discloses a scope of protection. It should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims

1. The utility model provides a lock body of lock pin, includes casing (1) and dial peach subassembly (2), oblique tongue (3) and square tongue (4) that are located casing (1), its characterized in that: the latch bolt (3) and the square bolt (4) are respectively matched with the peach-shift assembly (2), the peach-shift assembly (2) comprises an upper core (21) and a lower core (23) which are opposite to each other, and a middle core (22) which corresponds to the square bolt (4), and the upper core (21) and the lower core (23) both correspond to the latch bolt (3); install aggregate unit (5) in casing (1), aggregate unit (5) are including swing joint clutch lever (54) on square core (22) in the centre, upper side core (21), below core (23) and square core (22) cooperation are formed with slot (7), clutch lever (54) peg graft in slot (7).

2. A mortise lock according to claim 1, characterized in that: the linkage device (5) further comprises a motor (51), a guide rod (52) and a movable frame (53), a fixed seat (19) is fixed on one side, located on the middle square core (22), in the shell (1), the motor (51) is installed in the fixed seat (19), a driving gear (511) is fixed on the motor (51), a sliding frame (6) is movably connected to the fixed seat (19), the guide rod (52) penetrates through the sliding frame (6), and a driven gear (521) meshed with the driving gear (511) is fixed on the guide rod (52); a positioning shaft (522) is fixed on the guide rod (52), a spring with one fixed end is sleeved on the guide rod (52), and the positioning shaft (522) is arranged in a gap of the spring in a penetrating manner; the movable frame (53) is fixed on the outer side of the sliding frame (6) and can be used for the clutch rod (54) to slide.

3. A mortise lock according to claim 2, characterized in that: an open groove (223) is formed in the side wall, corresponding to the slot (7), of the middle square core (22), a connecting block (224) is fixed in the open groove (223), and the clutch lever (54) is bent and sleeved on the connecting block (224); a push plate (26) is fixed on the side wall of the middle square core (22), a matching plate (25) is formed on the side wall of the upper square core (21) and the lower square core (23) corresponding to one side of the push plate (26) and opposite to the push plate (26), a movable opening (27) is formed in the side wall of the middle square core (22) and located between the matching plate (25) and the push plate (26), a back lifting piece (8) is rotationally connected in the shell (1), one end of the back lifting piece (8) is bent and is provided with a drive plate (81) accommodated in the movable opening (27), and the matching plate (25) and the push plate (26) can be respectively abutted against the drive plate (81); the return lifting piece (8) drives the dead bolt (4) through the connecting structure (12).

4. A mortise lock according to claim 3, characterized in that: connection structure (12) are including rotating cover (13) and even board (14), it rotates to connect in casing (1) to rotate cover (13), and rotates and be fixed with on cover (13) and extend seat (131), it is formed with cooperation chamber (132) in extending seat (131), the other end of returning and carrying piece (8) is formed with centre gripping mouth (82), the lateral wall and swing joint in cooperation chamber (132) of centre gripping mouth (82) centre gripping extension seat (131), even board (14) and square tongue (4) fixed connection and cunning are located in casing (1), be fixed with on the lateral wall of rotating cover (13) and even board (14) complex extend board (133).

5. A mortise lock according to claim 3, characterized in that: the two sides of the middle square core (22) are respectively provided with a matching groove (221), and the upper square core (21) and the lower square core (23) are respectively positioned in the corresponding matching grooves (221); the upper core (21) and the upper core (21) are both fixed with square chips (24), the latch tongue (3) is fixed with a pull rod (31) positioned in the shell (1), the pull rod (31) is fixed with a positioning plate (32), the square chips (24) extend to form a linkage plate (241), the middle core (22) extends to form a butt joint plate (222), and the linkage plate (241) and the butt joint plate (222) can be abutted to the positioning plate (32); the matching plates (25) are respectively formed on the square chips (24) corresponding to the upper core (21) and the lower core (23).

6. A mortise lock according to claim 4, characterized in that: a waist-shaped hole (141) is formed in the connecting plate (14), a positioning nail (15) is fixed between the connecting plate (14) and the back lifting piece (8) in the shell (1), the positioning nail (15) penetrates through the waist-shaped hole (141), and the connecting plate (14) abuts against the positioning nail (15); and a sleeve (151) abutted against the connecting plate (14) is fixed on the positioning nail (15).

7. A mortise lock according to claim 6, characterized in that: be close to location nail (15) department on casing (1) and be fixed with staple (16), wear to be equipped with cooperation nail (17) that can slide on even board (14) on extension board (133), staple (16) and cooperation nail (17) correspond the department and are equipped with pressure spring (18), the one end cover of pressure spring (18) is located staple (16), other end cover is located cooperation nail (17).

8. A mortise lock according to claim 6, characterized in that: the improved lifting device is characterized in that a return lifting nail (9) is fixed in the shell (1), the return lifting piece (8) penetrates through the return lifting nail (9), a ring (10) is formed on the driving plate (81), and the return lifting nail (9) is sleeved with the ring (10).

9. A mortise lock according to claim 5, characterised in that: a sliding block (321) is formed on the positioning piece (32), and a sliding hole (11) for the sliding block (321) to slide is formed on the shell (1).