CN108952361A - A kind of smart lock lock body of lock tongue underrun - Google Patents

Abstract

The invention discloses an intelligent lock body with low-load operation of the deadbolt, which is installed in the door, and the door frame includes a door lock, the outer side of the lock body includes a shell, and one side of the shell includes a side wall end. The side wall end includes several telescopic holes, and the lock body includes a sub-lock, a deadbolt and a bolt, and the head of the deadbolt and the card end of the bolt can extend out of the telescopic hole and into the door. In the lock buckle, when the card end extends into the door lock buckle, the door is in the locked state, and the smart lock body includes a third fixed shaft connected with the housing and connected with the third fixed shaft It is a rotatable limit block of the axis and several rotatable drive wheels driven by the handle; one end of the limit block can be in contact with the lock tongue, and the other end can be in contact with the drive wheel, and the One end of the limit block in contact with the driving wheel includes a cylinder, and the cylinder can be in contact with the sub-lock.

Description

An intelligent lock body with low-load operation of the lock tongue

technical field

The invention relates to the field of intelligent locks, in particular to an intelligent lock body with a lock tongue operating under low load.

Background technique

With the continuous development of science and technology, smart locks have been widely used in ordinary families.

In a general intelligent lock body, a bolt for locking the door and a dead bolt for controlling the opening and closing of the door are arranged in the lock body, and part of the locking and releasing of the bolt and the dead bolt need to be driven by a handle. The applicant has applied for an invention patent with the Chinese patent application number 201810515174.X, which discloses a mortise lock that does not generate load when the bolt is in operation. A tongue locking unit, a deadbolt operating unit, an operating member, a deadbolt operating member, an insert, a guide groove, a driven gear, and a controller. When the lock body in this patent is opened, the deadbolt maintains a no-load state when rotating, which makes the movement of the deadbolt more stable, and can prevent the phenomenon that the deadbolt is stuck before unlocking, which is not conducive to the operation of the deadbolt.

However, in this patent, the neutron lock and the dead bolt need to be driven by the bolt limit block during operation, so that the dead bolt has a large load in the actual operation process, so that the operation of the dead bolt may appear stuck, so that the door It cannot be opened normally, which is very detrimental to the user's use.

Contents of the invention

The problem to be solved by the present invention is how to make up for the defects of the above-mentioned prior art, and provide an intelligent lock body with a low-load operation of the deadbolt.

Technical problem of the present invention can be solved by following technical scheme:

An intelligent lock body with a low-load operation of the deadbolt is installed in the door, the door frame includes a door lock, the outer side of the lock body includes a shell, one side of the shell includes a side wall end, and the side wall end includes Several telescopic holes, the lock body includes a sub-lock, a deadbolt and a door bolt, the head of the deadbolt and the card end of the door bolt can extend out of the telescopic hole into the door lock buckle, When the card end protrudes into the door lock, the door is in the locked state, and the smart lock body includes a third fixed shaft connected to the outer casing and can be moved around the third fixed shaft as the axis. A rotating limit block and several rotatable drive wheels driven by the handle; one end of the limit block can be in contact with the deadbolt, and the other end can be in contact with the drive wheel, and the limit block and The contacting end of the driving wheel includes a column, and the column can be in contact with the sub-lock.

Further, the limit block includes a fixed part, the fixed column includes a shaft hole, a roller is arranged in the shaft hole of the fixed part, and the side of the lock tongue that can be in contact with the roller includes a A flat inclined surface and a certain radian slot; when the roller is accommodated in the slot, the position of the lock bolt is fixed.

Further, the diameter of the fixing part is the same as that of the roller; when the fixing part is accommodated in the slot, the position of the lock tongue is also fixed.

Further, the lock tongue includes a lock tongue protrusion, and the limit block includes an accommodating groove matching the shape of the lock tongue protrusion; when the inclined surface is in contact with the roller, under the action of an external force, The inclined surface contacts the roller so that the lock tongue can move inward, and the lock tongue protrusion moves inward accordingly and extends into the accommodating groove, and the position of the limiting block changes accordingly.

Further, the sub-lock includes an L-shaped sub-lock body, the sub-lock body is in contact with the cylinder; when the sub-lock fully extends out of the housing, the sub-lock body drives the cylinder When the limit block is rotated, the inclined surface contacts the limit block, the position of the deadbolt can be moved, and the door is in an open state.

Further, the limiting block includes a pushing part, and the driving wheel includes a stationary groove, a groove and a pushing groove that can be in contact with the pushing part; when the pushing part contacts the stationary groove and the groove, the The clamping groove is in contact with the limiting block, and the position of the lock tongue is fixed; when the pushing part contacts the pushing groove, the inclined surface is in contact with the limiting block, and the locking tongue is movable.

Further, the drive wheel includes a drive shaft connected to the handle, and a drive shaft accommodating groove for accommodating the drive shaft, the handle drives the drive shaft to rotate, and then drives the drive wheel to rotate, so that the The contact position of the drive wheel and the limit block changes.

Further, the limit block includes a limit block spring fixed to the second fixed shaft in the housing, one end of the limit block spring is connected to the third fixed shaft, and the other end is connected to the center of the limit block. The spring fixing column is connected; the limit block spring makes the limit block always have a force in contact with the driving wheel.

Further, the lock tongue includes a lock tongue spring, and the sub-lock includes a sub-lock spring; the lock tongue spring and the sub-lock spring make the lock tongue and the sub-lock always have a force extending out of the housing .

Further, the lock tongue includes a lock tongue head with an arc-shaped edge, a lock tongue body, and a lock tongue block with symmetrical upper and lower sides, and the sub-lock includes a sub-lock head with an arc-shaped edge, a sub-lock body, and upper and lower sides. The two-sided symmetrical sub-lock block; the deadbolt head and the sub-lock head can extend out or be received in the telescopic hole and can be rotated; the deadbolt block and the sub-lock block are used to prevent the The deadbolt and the sub-lock come out of the telescopic hole at the end of the side wall, and when the deadbolt and the sub-lock rotate, the deadbolt stopper and the sub-lock stopper are rotated the rotation center point of .

Compared with the prior art, the beneficial effect achieved by this invention is: the intelligent lock body described in the present invention has small resistance, low load, and convenient operation of the lock tongue during operation, thereby making the opening and closing of the door smooth, Moreover, the structure is simple, the cost is low, and it is convenient for mass production.

Description of drawings

Fig. 1 is a schematic diagram of an overall appearance decomposition of a smart lock body with a deadbolt operating under low load according to the present invention;

Fig. 2 is a side view of the internal structure of a smart lock body with a deadbolt operating under low load according to the present invention;

Fig. 3 is the enlarged schematic diagram of place A in Fig. 2;

Fig. 4 is a schematic exploded view of the internal structure of the lock body of a smart lock body with a low-load operation of the dead bolt according to the present invention;

Fig. 5 is the enlarged schematic diagram of place B in Fig. 4;

Fig. 6 is a schematic diagram of the sub-lock structure of the lock body of a smart lock body with a low-load operation of the deadbolt according to the present invention;

Fig. 7 is a schematic diagram of the structure of a lock body of a smart lock body with a low-load operation of the lock tongue according to the present invention;

Fig. 8 is a side view of a lock body of a smart lock body with a lock tongue operating under low load according to the present invention;

Fig. 9 is a structural schematic diagram of a limit block of a lock body of a smart lock with low load operation of the deadbolt according to the present invention;

Fig. 10 is a side view of a limit block of a lock body of a smart lock with a deadbolt operating under low load according to the present invention;

Fig. 11 is a structural schematic diagram of the driving wheel of the lock body of a smart lock body with a deadbolt low-load operation according to the present invention;

Fig. 12 is a side view of the driving wheel of the lock body of a smart lock with a deadbolt operating under low load according to the present invention;

Fig. 13 is a schematic diagram and an enlarged view of the lock state of the lock body of a smart lock body with a deadbolt low-load operation according to the present invention;

Fig. 14 is a schematic diagram and an enlarged view of the door opening process X of the lock body of a smart lock with a low-load operation of the deadbolt according to the present invention;

Fig. 15 is a schematic diagram and an enlarged view of the door opening process Y of the lock body of a smart lock body operating under low load on the dead bolt according to the present invention

Fig. 16 is a schematic diagram and an enlarged view of the door opening process Z of the lock body of a smart lock with a low-load operation of the deadbolt according to the present invention;

Fig. 17 is a schematic diagram and an enlarged view of the door-opening state of the lock body of a smart lock operating under low load on the deadbolt according to the present invention.

Label in the figure

Shell 1, side wall end 11, first telescopic hole 11a, second telescopic hole 11b, third telescopic hole 11c, door lock 12, first lock hole 12a, second lock hole 12b, inner wall 13, spring fixing Frame 14, first fixed shaft 15, second fixed shaft 16, third fixed shaft 17, deadbolt guide groove 18, sub-lock 2, sub-lock head 21, sub-lock body 22, sub-lock bracket 221, sub-lock Spring 23, sub-lock block 24, deadbolt 3, deadbolt head 31, deadbolt body 32, card slot 32a, slope 32b, deadbolt projection 33, deadbolt guide block 34, deadbolt spring 35, deadbolt stop Block 36, limiting block 4, pushing part 41, fixing part 42, avoidance groove 43, accommodating groove 44, cylinder 45, roller 46, limiting block spring 47, fixing hole 48, spring fixing column 49, drive Wheel 5, drive shaft 51, stationary groove 52, groove 53, push groove 54, drive shaft accommodating groove 55, door bolt 6, clamping end 61.

Detailed ways

For the convenience of understanding, various components on the drawings are enlarged (thick) or reduced (thin) in the drawings, but this approach is not intended to limit the protection scope of the present invention.

Words in the singular include the plural and vice versa

The terms used in this specification are used to describe the embodiments of the present invention, but are not intended to limit the present invention.

In order to distinguish different units, words such as first and second are used in this specification, but these are not limited by the order of manufacture, and their names may be different in the detailed description and claims of the invention.

The natural state mentioned in the present invention refers to the state that each component presents without the action of external force.

Hereinafter, the present invention will be further described based on preferred embodiments with reference to the accompanying drawings.

Please refer to Fig. 1 to Fig. 3, a smart lock body with low-load operation of the deadbolt according to the present invention is installed in the door, and the door frame includes a door lock catch 12, and the outer side of the lock body includes a shell 1, and the shell 1 One side of the side wall includes a side wall end 11, and the side wall end 11 includes several telescopic holes, and the lock body includes a sub-lock 2, a dead bolt 3 and a bolt 6, and the head 31 of the dead bolt 3 and the The locking end 61 of the door bolt 6 can extend out of the telescopic hole and extend into the door lock 12 , when the locking end 61 extends into the door locking 12 , the door is in a locked state.

Specifically, the door latch 12 includes a first lock hole 12a and a second lock hole 12b, and the side wall end 11 includes a first telescopic hole 11a, a second telescopic hole 11b, and a third telescopic hole 11c. The card end 61 of door bolt 6 stretches out telescopic hole 11a and stretches in the first lock hole 12a, and the head 31 of deadbolt 3 stretches out telescopic hole 11c and stretches in the second lock hole 12b, and the sub-lock head of child lock 2 21 can extend out of the telescopic hole 11b, but the door lock does not reserve a lock hole for the sub-lock head 21, so when the lock body and the door frame are closed and the door is in the locked state, the sub-lock head 21 contacts the door lock 12, but the sub-lock 2 as a whole shrinks to the inside of the lock body under the pressure of the door lock catch 12, and is in a compressed state. And when the lock body was separated from the door lock catch 12 and the door was in the open state, the child lock head 21 had no external force pressure and stretched out of the lock body.

Please refer to FIG. 1 to FIG. 3 , the smart lock body also includes a limiting block 4 and a driving wheel 5 .

Please refer to FIG. 1 to FIG. 5 , the housing 1 is provided with an inner wall 13 , a spring fixing frame 14 , a first fixed shaft 15 , a second fixed shaft 16 , a third fixed shaft 17 , and a bolt guide groove 18 .

Please refer to Figures 1 to 6, the sub-lock 2 includes a sub-lock head 21 that can extend and extend into the housing 1, a sub-lock body 22 that is connected to the sub-lock head 21 in an L-shape, and is set on the outside of the sub-lock body 22 The sub-lock spring 23, the sub-lock block 24 that is located at the sub-lock head 22 and protrudes from the side of the sub-lock head 22, and the sub-lock body 22 is provided with a sub-lock bracket 221.

After assembly, the sub-lock head 22 can extend outside the second telescopic hole 11b, and the sub-lock block 24 is located inside the second telescopic hole 11b to prevent the sub-lock 2 from breaking away from the housing 1; the sub-lock spring 23 is located on the sub-lock bracket 221 and In the middle of the spring fixing frame 14, at this moment, because the spring fixing part 14 cannot move, so under the natural tension effect of the sub-lock spring 23, the sub-lock 2 always has the power to extend out of the housing 1.

In this embodiment, the sub-lock spring 23 is a compression spring.

Please refer to Fig. 1~Fig. 5, Fig. 7~Fig. 8, the dead bolt 3 includes the dead bolt head 31 which can extend and extend into the third telescopic hole 11c, the dead bolt body 32 connected with the dead bolt head 31, protruding from the The deadbolt protrusion 33 of the deadbolt body 32, the deadbolt guide block 34 matched with the deadbolt guide groove 18, the deadbolt spring 35 fixed on the first fixed shaft 15, located at the deadbolt head 31 and protruding from the deadbolt head The dead bolt stopper 36 of 31 sides. The locking bolt body 32 is provided with a locking groove 32a in a certain arc and a flat inclined surface 32b in contact with the limiting block 4 .

After assembly, the deadbolt head 31 can extend out of the third telescopic hole 11c, and the deadbolt stopper 36 is located inside the third telescopic hole 11c to prevent the deadbolt 3 from detaching from the housing 1; the deadbolt spring 35 is fixed on the first fixed shaft 15 , one end of which is connected to the inner wall 13, and the other end is connected to the deadbolt 3. After the connection, the deadbolt 3 is under the natural tension of the deadbolt spring 35, and the deadbolt 3 always has the power to extend out of the shell 1; the deadbolt guides The block 34 cooperates with the deadbolt guide groove 18 so that the deadbolt 3 always moves laterally under the limit of the deadbolt guide groove 18 .

In this embodiment, the bolt spring 35 is a torsion spring.

Please refer to Figs. 1 to 5 and Figs. 9 to 10, the limit block 4 includes a pushing part 41 which is in contact with the driving wheel 5, a fixing part 42 which can be in contact with the deadbolt body 32, and a spacer for accommodating the deadbolt spring 35. Empty groove 43, accommodating groove 44 for accommodating bolt protrusion 33, cylinder 45 in contact with sub-lock body 22, roller 46, limit block spring 47 fixed on second fixed shaft 16, for accommodating The fixing hole 48 of the third fixing shaft 17 and the spring fixing post 49 located in the middle of the limiting block 4 .

After the third fixed shaft 17 passes through the fixed hole 48 , the limiting block 4 can rotate around the third fixed shaft 17 .

The fixed portion 42 is provided with a shaft hole, and the roller 46 is arranged in the shaft hole of the fixed portion 42. In this embodiment, the fixed portion 42 has the same diameter as the roller 46; Contact the deadbolt body 32 at the same time, and the contact effect is the same. Preferably, the roller 46 is in contact with the deadbolt body 32 .

The limiting block spring 47 is fixed on the second fixed shaft 16, one end of which is connected with the spring fixed shaft 49, and the other end is connected with the third fixed shaft 17. After the connection, under the natural tension of the limiting block spring 47, the limit Block 4 always has a clockwise rotation force. In this embodiment, the limit block spring 47 is a torsion spring.

In the natural state, the sub-lock 3 extends out of the side wall end 11. At this time, the roller 46 is in contact with the engaging groove 32a, and there is a certain arc in the engaging groove 32a, so that the roller 46 matches the engaging groove 32a, so the sub-lock 3 The position is fixed; when the roller 46 rotates counterclockwise under the action of an external force, the roller 46 slides out of the slot 32a and contacts the inclined surface 32b. Inside the casing 1, the roller 46 cannot fix the position of the inclined surface 32b, so the position of the sub-lock 3 is no longer fixed and can freely go in and out of the casing 1.

When the sub-lock 3 stretches into the housing 1, the sub-lock 3 extends inward under the guidance of the deadbolt guide groove 18. At this time, the limiting block 4 will rotate counterclockwise under the drive of the inclined surface 32b. When the sub-lock 3 When the lock 3 slides into the top end of the deadbolt guide groove 18 , the deadbolt projection 33 can be accommodated in the accommodating groove 44 .

The cylinder 45 is in contact with the sub-lock body 22 . Specifically, one end of the sub-lock body 22 can directly drive the cylinder 45 .

Please refer to Fig. 3 , the pushing part 41 is in direct contact with the driving wheel 5, and the cylinder 45 is in direct contact with the sub-lock body 2. In the case of only considering the sub-lock 2 and the limit block 4, when the sub-lock body 22 moves outward from the housing 1 When moving, the sub-lock body 22 can directly drive the cylinder 45 to rotate counterclockwise with the third fixed shaft 17 as the axis; Under tension, it will always contact the sub-lock body 22, so that the limiting block 4 rotates clockwise synchronously with the third fixed shaft 17 as the axis.

Please refer to Figure 1~Figure 5, Figure 11~Figure 12. The drive wheel 5 includes a drive shaft 51 connected to the handle and driven by it, a stationary groove 52 , a groove 53 , and a push groove 54 that can contact the pusher 41 , and a drive shaft accommodating groove 55 for accommodating the drive shaft 51 .

The rotation of the handle drives the drive shaft 51 to rotate, and then drives the drive shaft accommodating groove 55 to rotate with the drive shaft 51 as the axis. In the natural state, when only the limit block 4 and the driving wheel 5 are considered, the pushing part 41 is in contact with the stationary groove 52 and snapped into the stationary groove 52. When the driving shaft 51 rotates clockwise, it drives the driving wheel 5 clockwise. Rotate, the stop block 4 is in contact with the driving wheel 5 all the time under the effect of the stop block spring 47, and along with the clockwise rotation of the drive wheel 5, the pushing part 41 slides in the groove 53 from the static groove 52, at this moment, Since the groove 53 is recessed in the drive wheel 5 to a greater extent than the stationary groove 52, the position of the entire stop block 4 remains unchanged; when the drive shaft 51 continues to rotate clockwise, the pushing part 41 slides into the pushing groove 54 from the groove 53 , at this time, since the pushing groove 54 protrudes from the stationary groove 52 and the groove 53, and protrudes from the driving wheel 5, the pushing groove 54 pushes the pushing part 41, so that the limiting block 4 rotates counterclockwise.

Since the groove 53 and the pushing groove 54 are arranged symmetrically up and down, when the drive shaft 51 rotates counterclockwise, it drives the limit block 4 to also rotate counterclockwise, which will not be described in detail here.

Hereinafter, the working process of the smart lock body of the present invention will be further described.

Please refer to Figures 2 to 3 and Figures 13 to 17. The lock body of the smart lock described in the present invention is mainly in two states, that is, the locked state and the opened state, and the state from the locked state to the opened state The process is called the door opening process. In this embodiment, the door opening process is divided into three steps: door opening process X, door opening process Y, and door opening process Z for detailed description.

Please refer to Figure 13, when the lock body is in the locked state, the card end 61 extends into the first lock hole 12a, the lock tongue 3 extends into the second lock hole 12b, and the child lock 2 is in contact with the door lock catch 12 and is compressed into the housing 1.

The pushing part 41 of the limiting block 4 is engaged in the stationary groove 52, and the roller 46 is engaged in the engaging groove 32a. At this time, the limiting block 4 cannot move, so that the position of the deadbolt 3 is fixed.

When opening the door, press the handle to drive the drive wheel 5 to rotate. Please refer to FIG. 14 , when the driving wheel 5 rotates until the pushing part 41 engages in the groove 53 , it is the door opening process X.

At this time, the pushing part 41 is snapped into the groove 53 so that the position of the pushing part 41 does not change, so the limiting block 4 does not rotate and move, and at this time, the lock body still cannot be opened.

Continue to press the handle to drive the driving wheel 5 to continue to rotate. Please refer to FIG. 15 . When the driving wheel 5 rotates until the pushing part 41 snaps into the pushing groove 54, it is the door opening process Y.

At this time, the card end 61 protrudes into the inside of the housing 1 . The pushing part 41 is driven by the pushing groove 54 to make the limiting block 4 rotate counterclockwise. Further, the roller 46 also rotates counterclockwise, and the roller 46 slides out of the slot 32a and contacts the inclined surface 32b. The position of the lock tongue 3 is no longer fixed, and the lock tongue 3 can slide to the inner side of the shell 1 . The lock body has no part limit, and the lock body can be opened.

Push the door body so that the door body is in contact with the door lock catch 12 and away from the door lock catch 12. Please refer to FIG.

At this moment, the lock tongue 3 slides out from the second buckle 12 b and is compressed by the door frame, so that the lock tongue 3 is pressed into the inside of the housing 1 . During the press-in process, the bolt 3 slides into the housing 1 under the guidance of the bolt guide groove 18, the inclined surface 32b contacts the roller 46 and continues to slide inward, and the bolt protrusion 33 then enters the accommodation groove 44, Furthermore, the entire limit block 4 continues to rotate counterclockwise. The pushing part 41 breaks away from the pushing groove 54 , and the sub-lock body 22 breaks away from the cylinder 45 .

At this time, as long as the door body continues to be pushed, the lock body is disengaged from the door lock catch 12, and the door enters the door-opening state. Please refer to the schematic diagram in Figure 17 when the door is open.

The lock body is disengaged from the door catch 12, and the dead bolt 3 recovers under the action of the dead bolt spring 35 to extend out of the shell 1 without the restriction of external force; Under the action, the shell 1 is also extended, and the sub-lock body 22 contacts and presses the cylinder 45, so that the limit block 4 continues to rotate counterclockwise, so the pushing part 41 cannot contact the driving wheel 5, and the roller 46 continues to contact the inclined surface 32b. touch. Dead bolt 3 is not limited. At this moment, the lock body is in the state of opening the door.

Above, the overall process of the lock body from the locked state to the opened state is completed.

The specific embodiments of the present invention have been described in detail above. For those skilled in the art, without departing from the principle of the present invention, some improvements and modifications can also be made to the present invention, and these improvements and modifications also belong to the present invention. The scope of the claims.

Claims (10)

1. It include door latch (12), the lock on doorframe 1. a kind of smart lock lock body of lock tongue underrun, is installed in door External side includes shell (1), and the side of shell (1) includes sidewall end (11), and the sidewall end (11) includes that several are flexible Hole, the interior lock body includes son lock (2), lock tongue (3) and keeper (6), the head (31) of the lock tongue (3) and the keeper (6) The extended telescopic hole in card end (61) protrude into the door latch (12), when the card end (61) protrudes into the door latch (12) when interior, door is in state of locking a door, it is characterised in that:

   The smart lock lock body includes connecting with the third fixing axle (17) of the shell (1) and with the third fixing axle (17) For the rotatable limited block in axle center (4) and several driven rotatable driving wheel (5) by handle；

   One end of the limited block (4) can be contacted with the lock tongue (3), and the other end can be contacted with the driving wheel (5), and described One end that limited block (4) is contacted with the driving wheel (5) includes cylinder (45), and the cylinder (45) can connect with the sub- lock (2) Touching.
2. 2. a kind of smart lock lock body of lock tongue underrun according to claim 1, it is characterised in that:

   The limited block (4) includes fixed part (42), includes axis hole in the fixed column (42), and roller (46) is set to the fixation In the axis hole in portion (42),

   The side that the lock tongue (3) can be in contact with the roller (46) includes in the inclined-plane (32b) of plane and in certain radian Card slot (32a)；

   When the roller (46) be placed in the card slot (32a) it is interior when, lock tongue (3) position is fixed.
3. 3. a kind of smart lock lock body of lock tongue underrun according to claim 2, it is characterised in that:

   The fixed part (42) is identical as the roller (46) diameter；

   When the fixed part (42) be placed in the card slot (32a) it is interior when, lock tongue (3) position is also fixed.
4. 4. a kind of smart lock lock body of lock tongue underrun according to claim 2, it is characterised in that:

   The lock tongue (3) includes that lock tongue is raised (33), and the limited block (4) includes matching with raised (33) shape of the lock tongue Accommodation groove (44)；

   When the inclined-plane (32b) and the roller (46) is contacted, under external force, the inclined-plane (32b) contacts the rolling Column (46) move inward the lock tongue (3) can, and the lock tongue raised (33) moves inward therewith and protrudes into the accommodation groove (44) in, limited block (4) position changes therewith.
5. 5. a kind of smart lock lock body of lock tongue underrun according to claim 2, it is characterised in that:

   The sub- lock (2) includes L-shaped sub- lock machine body (22), and the sub- lock machine body (22) contacts with the cylinder (45)；

   When fully extended shell (1) of the sub- lock (2), it is described that the sub- lock machine body (22) drives the cylinder (45) to make Limited block (4) rotation, the inclined-plane (32b) contact with the limited block (4), and the lock tongue (3) is position-movable, and door is in and opens Door state.
6. 6. a kind of smart lock lock body of lock tongue underrun according to claim 2, it is characterised in that:

   The limited block (4) includes pushing part (41), and the driving wheel (5) is static including that can contact with the pushing part (41) Slot (52), groove (53) and promotion slot (54)；

   When the pushing part (41) and the stationary groove (52) and groove (53) contact, the card slot (32a) and the limit Block (4) contact, lock tongue (3) position is fixed；

   When the pushing part (41) and the promotion slot (54) contact, the inclined-plane (32b) contacts with the limited block (4), The lock tongue is removable.
7. 7. a kind of smart lock lock body of lock tongue underrun according to claim 1, it is characterised in that:

   The driving wheel (5) includes the drive shaft accommodating of the drive shaft (51) connecting with handle and the accommodating drive shaft (51) Slot (55),

   The handle drives the drive shaft (51) to rotate, and then the driving wheel (5) is driven to rotate, so that described The position that driving wheel (5) is in contact with the limited block (4) changes.
8. 8. a kind of smart lock lock body of lock tongue underrun according to claim 1, it is characterised in that:

   The limited block (4) includes the limited block spring (47) for being fixed on the second fixing axle (16) in the shell (1), the limit Position block spring (47) one end is connect with the third fixing axle (17), the other end and the spring for being located at limited block (4) center Fixed column (39) connection；

   The limited block spring (47) makes the limited block (4) always exist the power being in contact with the driving wheel (5).
9. 9. a kind of smart lock lock body of lock tongue underrun according to claim 1, it is characterised in that:

   The lock tongue (3) includes latch bolt spring (35), and the sub- lock (2) includes son lock spring (23)；

   The latch bolt spring (35) and the sub- lock spring (23) make the lock tongue (3) and the sub- lock (2), and presence is stretched always The power of the shell out.
10. 10. a kind of smart lock lock body of lock tongue underrun according to claim 1, it is characterised in that:

    The lock tongue (3) includes lock tongue head (31), lock tongue body (32) and the symmetrical lock tongue of upper and lower surface that edge is arc Block (36),

    The sub- lock (2) includes that edge is the sub- lock head of arc (21), sub- lock machine body (22) and upper and lower surface symmetrically sub- stopper Block (24)；

    The lock tongue head (31) and the sub- lock head (21) can stretch out or take in the telescopic hole and rotatable；

    The lock tongue block (36) and the sub- stopper block (24) are for preventing the lock tongue (3) and the sub- lock (2) from deviating from institute Outside the telescopic hole for stating sidewall end (11), and when the lock tongue (3) and the sub- lock (2) rotate, the lock tongue block (36) rotary middle point when and the sub- stopper block (24) is rotation.