CN217712115U

CN217712115U - Spring bolt small-angle toggle structure and magnetic suction lock with same

Info

Publication number: CN217712115U
Application number: CN202221254166.2U
Authority: CN
Inventors: 李仲甘
Original assignee: Individual
Current assignee: Individual
Priority date: 2022-05-24
Filing date: 2022-05-24
Publication date: 2022-11-01
Anticipated expiration: 2032-05-24

Abstract

The utility model discloses a small-angle toggle structure of a lock tongue and a magnetic suction lock with the structure, which comprises a step-shaped butt block fixed on the surface of a lock tongue pulling plate; the utility model discloses a shift wheel, including the shift wheel circumference outer wall, the shift wheel is installed in the lock shell, and rotate the thumb wheel of installing in the lock shell, it has first through-hole to run through perpendicularly in the central axis department of thumb wheel, is equipped with the shift fork on thumb wheel circumference outer wall, the shift fork has two-layer from top to bottom, and the shift fork on upper strata butt piece upper and lower floor's shift fork butt bottom butt piece is last, still including the lock shell of compriseing last casing and lower casing, and spring bolt arm-tie movable mounting is in the lock shell, is equipped with the spring bolt at spring bolt arm-tie front end, can install on the door frame, hold the hasp that the spring bolt got into, the utility model aims at providing a can let the thumb wheel realize 36 degrees low-angle rotations, alright completion switch lock's action, the extremely narrow width also can be accomplished to the shell of tool to lock, makes the spring bolt toggle structure of the fault rate greatly reduced of tool to lock and have the low-angle magnetism to inhale the lock of this structure.

Description

Spring bolt small-angle toggle structure and magnetic suction lock with same

Technical Field

The utility model relates to a tool to lock field especially relates to a spring bolt low-angle toggle structure and have magnetism of this structure and inhale the lock.

Background

The tool to lock of selling, when opening the door, all need press rotatory handle, the handle orders about the thumb wheel and rotates the back, drive the spring bolt arm-tie and remove, and then withdraw the spring bolt from the hasp, but when traditional tool to lock wanted to unblank, all need the rotatory very big angle of handle, the work of unblanking of spring bolt withdrawal from the hasp could only be accomplished to some needs rotation degrees, then each producer has further optimized the required rotation angle of unblanking, only need rotatory 45 degrees to unblank at minimum, but still be swift convenient inadequately like this, and most declare the tool to lock that the small-angle unblanked, inner structure is all more complicated, this causes also greatly increased of fault rate, the volume of lock core also increases simultaneously.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a lock is inhaled to spring bolt low-angle toggle structure and magnetism that has this structure.

In order to achieve the above purpose, the utility model adopts the following scheme: the utility model provides a spring bolt low-angle toggle structure which characterized in that, including: the butt-joint blocks are symmetrically arranged on the spring bolt pulling plate, and each butt-joint block is fixed on the surface of the spring bolt pulling plate in a step shape; the shifting wheel is rotatably installed in the lock shell, a first through hole capable of being connected with a handle penetrates through the center axis of the shifting wheel vertically, shifting forks capable of corresponding to the abutting blocks and shifting the abutting blocks to move backwards are arranged on the outer wall of the circumference of the shifting wheel, the shifting forks are arranged in an upper layer and a lower layer, and the shifting forks on the upper layer and the lower layer are movably abutted to the corresponding bottom abutting blocks.

As the utility model discloses a further scheme, the butt piece is including the long piece that is located the bottom to and the short piece of stacking at the long piece top, and the short piece extends to the centre of long piece forward by the afterbody of long piece, the long piece with the front end of short piece all is equipped with the inclined plane, each the butt is moved respectively on the inclined plane that corresponds to the one end of butt piece.

As the utility model discloses preferred scheme, the shift fork is including respectively at the first piece of stirring of thumb wheel circumference outer wall crisscross setting from top to bottom, and the second stir the piece, first stir the piece be located the direction of rotation the second stir the piece be located first stir the piece after, first stir piece and second stir the piece respectively the activity butt on the butt piece of spring bolt arm-tie wherein one side, first stir the piece activity butt and be in on the inclined plane of short piece, second stir piece activity butt and be in on the inclined plane of long piece.

As a further aspect of the present invention, the shifting fork includes a first toggle block fixed on the outer wall of the toggle wheel circumference, located at the top, and a second toggle block disposed below the first toggle block, wherein the width of the first toggle block is greater than that of the second toggle block, the second toggle block is away from the butt-joint block, the one end of the butt-joint block is away from the first toggle block, the one end of the butt-joint block is parallel and level with the one end of the butt-joint block, the first toggle block is in the inclined plane of the short block, the second toggle block is in the inclined plane of the long block.

Through the scheme, the shifting wheel can be rotated by a smaller angle to enable the spring bolt pulling plate to move backwards and retract to a required position, the shifting forks which are stacked up and down are abutted against the scheme that the side walls used by the abutting blocks corresponding to the ladder shape are arranged in a staggered mode, the effect of pushing the abutting blocks from the past to the future can be achieved, when the first shifting block at the top layer is firstly contacted with the short block at the top layer in the abutting block, the short block is shifted to move backwards and reaches the angle to be separated, the second shifting block at the bottom layer replaces the first shifting block to shift the long block at the bottom layer in the abutting block, the abutting block continues to move backwards, so that the rotation of the smaller angle can be achieved, and the spring bolt pulling plate can be moved backwards to the required position, and the purpose of shifting and unlocking at the small angle is achieved.

Simultaneously, the shift fork of range upon range of design and the design of cascaded two-stage motion's butt piece can let the shift fork accomplish the shortest length, and the thumb wheel also can furthest be pressed close to with it complex butt piece, so the width of spring bolt arm-tie can accomplish extremely narrow width, and the shell of tool to lock also reduces the volume thereupon.

The utility model provides a magnetism is inhaled lock, including as above spring bolt low-angle toggle structure, spring bolt arm-tie movable mounting in the lock shell and can follow the lock shell back-and-forth movement the spring bolt arm-tie front end is equipped with the spring bolt lock shell front end wall face runs through to be equipped with and to let the spring bolt along with the spring bolt arm-tie back-and-forth movement, and then stretch out the lock shell outside or the lock tongue hole in the withdrawal lock shell front end one side is equipped with and can install on the door frame, hold the hasp that the spring bolt got into run through on the lock shell outer wall and have the correspondence the handle hole of first through-hole.

As a further aspect of the present invention, the lock tongue is including fixing the lock tongue main part of lock tongue arm-tie front end to and first magnetism piece of inhaling the outer parcel of lock tongue main part has the lock tongue shell, first magnetism piece of inhaling is through lock tongue shell parcel, fix lock tongue main part front end.

Through the scheme, the use of various small parts such as springs, torsion springs and the like for keeping the handle reset in the lockset can be reduced, the internal structure of the lockset is simplified, and the failure rate of the lockset is greatly reduced

As a further aspect of the present invention, the lock catch includes a lock catch housing having an inner concave portion, and an inner frame is embedded in the lock catch housing and has an inner concave shape, wherein the inner frame is clamped between the left and right side walls of the inner cavity of the lock catch housing and the inner frame, and the inner frame is embedded in the inner frame and can absorb the magnetic attraction block of the first magnetic attraction block.

As the utility model discloses preferred scheme the inside casing bottom is equipped with at least one side minor face position open-ended storage tank, the second magnetism piece inserts through the opening of minor face position the storage tank internal fixation.

As the utility model discloses preferred scheme the hasp casing with it has the screw hole that can twist the screw to run through around on the inside casing.

As a preferred embodiment of the present invention, its characterized in that, the lock shell comprises last casing and lock casing bottom's lower casing and has the lock shell of cavity inner chamber, the spring bolt arm-tie sets up in the cavity inner chamber of lock shell the central authorities of spring bolt arm-tie have afterbody open-ended bar groove along the length of spring bolt arm-tie, and the thumb wheel sets up the opening part at bar groove afterbody, butt piece sets up at the spring bolt arm-tie afterbody upper surface that is located bar groove both sides rotate in the cavity inner chamber of lock shell and are equipped with the shifting knob, correspond the position of shifting knob on last casing and lower casing and be equipped with the locking hole, run through the second through-hole that is equipped with ability volume anti-lock button connection in the axle center department of shifting knob the bar inslot activity is embedded to have can be at the locking block of bar inslot back-and-forth movement the circumference outer wall of shifting knob is equipped with can rotate along with the shifting knob, and then promotes the lug that the locking block retrogradation is equipped with the recess the locking block tail end is equipped with can insert along with the locking block postdisplacement the last casing tail end and the strip shape inner wall has the last casing and the last casing extension of tail end to have the strip shape hole, the stationary blade that can be equipped with the stationary blade that the extension.

To sum up, the utility model discloses for its beneficial effect of prior art is:

one is as follows: the utility model discloses a set up the butt piece that is the echelonment on the spring bolt arm-tie, it is together for upper and lower floor with the shift fork design on the thumb wheel, the crisscross scheme that sets up of the used lateral wall of butt piece that the corresponding echelonment of shift fork butt from top to bottom stacks, follow secondary motion before reaching, promote the effect of butt piece, contact the short block of top layer in the butt piece at first when the first stirring piece of top layer, stir the rethread with it, and when reaching the angle that is about to break away from, the long block of bottom in the butt piece is stirred thereupon in the first stirring piece of bottom second stirring piece replacement, continue to make the butt piece rethread, so just can let the thumb wheel realize 36 degrees less angle rotations, alright accomplish behind the spring bolt arm-tie and move to required position, and then make the spring bolt retract and put in place, and the design of the shift fork of range upon range of design and cascaded butt piece, can let the shift fork accomplish shortest length, complex also can press close to the thumb wheel to with it to match with it to be furthest, so the width of spring bolt arm-tie alright narrow width, the volume thereupon also can be fit for more applicable scenes of reducing, the lock, be more.

The second step is as follows: the utility model provides a lock scheme collocation spring bolt low-angle toggle structure is inhaled to another magnetism can reduce in the tool to lock various for example spring, torsional spring etc. and let the use quantity that keeps the gadget that the handle resets, has simplified tool to lock inner structure, makes the fault rate greatly reduced of tool to lock.

Drawings

Fig. 1 is a perspective cross-sectional view of the present invention.

Fig. 2 is an exploded view of the present invention, and a partial enlarged view of the drawing.

Fig. 3 is an exploded view of the second embodiment of the present invention.

Fig. 4 is an enlarged view at a in fig. 3.

Fig. 5 is a perspective view of a first embodiment of a shifting fork on a middle shifting wheel according to the present invention.

Fig. 6 is a perspective view of a second embodiment of a shifting fork on a middle shifting wheel according to the present invention.

Detailed Description

The following detailed description provides many different embodiments, or examples, for implementing the invention. Of course, these are merely embodiments or examples and are not intended to be limiting. In addition, repeated reference numbers such as repeated numbers and/or letters may be used in different embodiments. These iterations are for simplicity and clarity of describing the present invention and are not intended to represent a particular relationship between the various embodiments and/or configurations discussed.

Furthermore, spatially relative terms, such as "under" 823030 "," below "," underside "," inside-out "," above "," upper "and the like, may be used herein to facilitate describing the relationship of one element or feature to another element or feature in the drawings and may encompass different orientations of the device in use or operation and the orientation depicted in the drawings. The devices may be rotated 90 degrees or other orientations from different orientations and the spatially relative descriptors used herein interpreted accordingly and as such are not to be construed as limiting the invention, and the terms "first" and "second" are used for descriptive purposes only and are not intended to indicate or imply relative importance or to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

The invention will be further described with reference to the following description and embodiments in conjunction with the accompanying drawings: as shown in fig. 1 to 3 and fig. 5 and 6, the small angle striking structure of the lock tongue comprises: the bolt support device comprises abutting blocks 1 symmetrically arranged on a bolt pull plate 10, wherein each abutting block 1 is fixed on the surface of the bolt pull plate 10 in a step shape; the shifting wheel 30 is rotatably installed in the lock shell 20, a first through hole 31 which is square and can be connected with the handle vertically penetrates through the center axis of the shifting wheel 30, the connection refers to that a square core column of a traditional handle penetrates through the first through hole 31, and the connection with the square core column of the handle in the place is the prior art and is not described again; the shifting fork 40 which can correspond to each abutting block 1 and shift the abutting blocks 1 to move backwards is arranged on the circumferential outer wall of the shifting wheel 30, the shifting fork 40 is provided with an upper layer and a lower layer, and the shifting fork 40 on the upper layer movably abuts against the corresponding upper layer abutting block 1 and the shifting fork 40 on the lower layer movably abuts against the corresponding bottom layer abutting block 1.

As shown in fig. 1 to 3, in this embodiment, the abutting block 1 includes a long block 11 located at the bottom and a short block 12 stacked on the top of the long block 11, the short block 12 extends forward from the tail of the long block 11 to the middle of the long block 11, the front ends of the long block 11 and the short block 12 are both provided with an inclined surface 13, one end of each abutting block 1 is movably abutted on the corresponding inclined surface 13, in this embodiment, there are two sets of abutting blocks 1, and each set of abutting block 1 is composed of one long block 11 and one short block 12.

In this embodiment, the shift forks 40 are also two sets, and each set of shift forks 40 corresponds to one set of the abutting block 1, specifically as follows:

wherein, as shown in fig. 1, fig. 2 and fig. 5, for in the utility model discloses in the first embodiment of shift fork, every group shift fork 40 is including fixing respectively on the circumference outer wall of thumb wheel 30, being located the first stirring piece 41 at top to and set up the second stirring piece 42 in first stirring piece 41 below, the width of first stirring piece 41 is greater than second stirring piece 42, second stirring piece 42 keeps away from the one end of butt joint piece 1 with first stirring piece 41 keeps away from the one end parallel and level of butt joint piece 1, the lateral wall activity butt of first stirring piece 41 is in on the inclined plane 13 of short block 12, the lateral wall activity butt of second stirring piece 42 is in on the inclined plane 13 of long block 11. When the first toggle block 41 on the top layer contacts the short block 12 on the top layer in the butt joint block 1 first and toggles the short block to move backward and reaches the angle to be separated, the second toggle block 42 on the bottom layer replaces the first toggle block 41 to toggle the long block 11 on the middle and bottom layers of the butt joint block 1, and continues to move the butt joint block 1 backward, so that the purpose that the bolt pulling plate 10 moves backward to the required position in the lock shell 20 can be achieved by rotating at a smaller angle, and the toggle wheel 30 in the embodiment can be unlocked by rotating only 36 degrees through repeated tests.

In addition, as shown in fig. 6, for the second embodiment of the shifting fork in the present invention, the shifting fork 40 also includes a first shifting block 41 and a second shifting block 42 respectively disposed on the upper and lower layers of the circumferential outer wall of the shifting wheel 30, and it is clear from the drawing that this embodiment is basically the same as the first embodiment, and only the widths of the first shifting block 41 and the second shifting block 42 are different, in the first embodiment, the first shifting block 41 is sector-shaped, and the second shifting block 42 is long-bar-shaped, and it can be seen from the drawing that the second shifting block 42 is significantly smaller than the first shifting block 41, and just near the tail end of the rotation direction of the first shifting block 41, this is to enable the first shifting block 41 to contact the short block 12 located on the top layer in the butt block 1 in the synchronous rotation process, shift the short block to move the short block, and then the first shifting block 41 is pushed by the second shifting block 42 located on the bottom layer in the butt block 1, and the second shifting block 41 is disposed in the same step-shaped manner as the first shifting block 41, and the second shifting block 42 is disposed in the same as the second shifting block 41, and the second shifting block 42.

As shown in fig. 1 to 4, the utility model also provides a magnetic lock, which specifically comprises: the lock shell 20 is a lock shell 20 with a hollow inner cavity and composed of an upper shell 21 and a lower shell 22 buckled at the bottom of the upper shell 21, two mounting lugs are arranged on the left and the right of the upper shell 21, the bolt pulling plate 10 is movably mounted in the hollow inner cavity of the lock shell 20 and can move back and forth along the lock shell 20, a handling hole 24 corresponding to the first through hole 31 penetrates through the outer walls of the upper shell 21 and the lower shell 22, a bolt 50 is arranged at the front end of the bolt pulling plate 10, a bolt hole 23 which can enable the bolt 50 to move back and forth along with the bolt pulling plate 10 and further extend out of the lock shell 20 or retract into the lock shell 20 is arranged on the front end wall surface of the lock shell 20 in a penetrating manner, a strip-shaped groove 14 with an opening at the tail part penetrates through the center of the bolt pulling plate 10 along the length of the bolt pulling plate 10, and the thumb wheel 30 is arranged at the opening at the tail part of the strip-shaped groove 14, the butt-joint block 1 is arranged on the upper surface of the tail part of the bolt pulling plate 10 positioned at two sides of the strip-shaped groove 14, a shifting button 70 is rotatably arranged in the hollow inner cavity of the lock shell 20, a locking hole 25 is arranged on the positions, corresponding to the shifting button 70, on the upper shell 21 and the lower shell 22, a second through hole 72 capable of connecting with a back-locking button is arranged at the axis of the shifting button 70 in a penetrating way, the back-locking button arranged on the door body passes through the locking hole 25 and extends into the second through hole 72, the second through hole 72 is a cross-shaped through hole in the embodiment, a locking block 80 capable of moving back and forth in the strip-shaped groove 14 is movably embedded in the strip-shaped groove 14, a groove 32 is arranged at the center of the shifting wheel 30 positioned between the two groups of shifting forks, a convex block 71 capable of rotating along with the shifting button 70 and further pushing the locking block 80 to move back is arranged on the circumferential outer wall of the shifting button 70, and a convex block 71 capable of moving back along with the locking block 80 and inserting into the groove 32, an insertion block 81 which can prevent the thumb wheel 30 from rotating, wherein a strip-shaped hole 82 penetrates through the center of the locking block 80, a fixing piece 211 which can be inserted into the strip-shaped hole 82 extends downwards from the inner wall of the top of the upper shell 21, and a spring (not shown in the figure) which can reset the locking block 80 is arranged between the inner wall of the tail end of the strip-shaped hole 82 and the fixing piece 211; the bolt 50 comprises a bolt main body 51 fixed at the front end of the bolt pulling plate 10 and a first magnetic suction block 52, a bolt shell 53 is wrapped outside the bolt main body 51, and the first magnetic suction block 52 is wrapped and fixed at the front end of the bolt main body 51 through the bolt shell 53; a lock catch 60 which can be installed on a door frame and can accommodate the bolt 50 is arranged on one side of the front end of the lock case 20, the lock catch 60 comprises a lock catch shell 61 which is arranged in a concave manner, an inner frame 62 which is also arranged in a concave manner is embedded in the lock catch shell 61, the inner frame 62 is clamped with the left side wall surface and the right side wall surface of the inner cavity of the lock catch shell 61 through buckles 63 which are protruded from the left end and the right end, and a second magnetic attraction block 64 which can attract the first magnetic attraction block 52 is embedded in the inner frame 62. Specifically, the bottom of the inner frame 62 is provided with a receiving groove 621 with at least one short edge opening, the second magnetic attraction block 64 is inserted into the receiving groove 621 through the short edge opening for fixing, and screw holes 65 capable of screwing screws are formed in the front and rear of the lock housing 61 and the inner frame 62. The mutual adsorption cooperation of first magnetism piece 52 and second magnetism piece 64 can reduce in the tool to lock various for example spring, torsional spring etc. let the use quantity of the little part that keeps the handle to reset, has simplified tool to lock inner structure, makes the fault rate greatly reduced of tool to lock.

The basic principles and main features of the present invention and the advantages of the present invention have been shown and described above, and it should be understood by those skilled in the art that the present invention is not limited by the above embodiments, and the description in the above embodiments and the description is only illustrative of the principles of the present invention, and the present invention can be modified in various ways without departing from the spirit and scope of the present invention, and these modifications and changes fall into the scope of the present invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. The utility model provides a spring bolt low-angle toggle structure which characterized in that, including: the bolt connecting device comprises abutting blocks (1) symmetrically arranged on a bolt pulling plate (10), wherein each abutting block (1) is fixed on the surface of the bolt pulling plate in a step shape; and the shifting wheel (30) is rotatably installed in the lock shell (20), a first through hole (31) capable of being connected with a handle penetrates through the center axis of the shifting wheel (30) vertically, a shifting fork (40) capable of corresponding to each abutting block (1) and shifting the abutting blocks (1) to move backwards is arranged on the outer wall of the circumference of the shifting wheel (30), the shifting fork (40) is divided into an upper layer and a lower layer, and the shifting fork (40) on the upper layer is movably abutted to the shifting fork (40) on the upper layer and the shifting fork (40) on the lower layer corresponding to the upper layer abutting blocks (1) in a movable abutting mode on the corresponding bottom layer abutting blocks (1).

2. The small-angle striking structure of the lock bolt according to claim 1, wherein the abutting block (1) comprises a long block (11) located at the bottom and a short block (12) stacked on the top of the long block (11), the short block (12) extends forward from the tail of the long block (11) to the middle of the long block (11), inclined planes (13) are arranged at the front ends of the long block (11) and the short block (12), and one end of each abutting block (1) is movably abutted to the corresponding inclined plane (13).

3. The small-angle shifting structure of the lock bolt according to claim 2, wherein the shifting fork (40) comprises a first shifting block (41) and a second shifting block (42) which are respectively staggered up and down on the outer wall of the circumference of the shifting wheel (30), the first shifting block (41) is located at the front end of the rotation direction, the second shifting block (42) is located behind the first shifting block (41), the first shifting block (41) and the second shifting block (42) are respectively and movably abutted against the abutting block (1) on one side of the lock bolt pulling plate (10), the first shifting block (41) is movably abutted against the inclined plane (13) of the short block (12), and the second shifting block (42) is movably abutted against the inclined plane (13) of the long block (11).

4. The small-angle shifting structure of the lock bolt according to claim 2, wherein the shifting fork (40) comprises a first shifting block (41) fixed on the circumferential outer wall of the shifting wheel (30) and located at the top, and a second shifting block (42) arranged below the first shifting block (41), the width of the first shifting block (41) is larger than that of the second shifting block (42), one end, far away from the abutting block (1), of the second shifting block (42) is flush with one end, far away from the abutting block (1), of the first shifting block (41), the first shifting block (41) is movably abutted against the inclined surface (13) of the short block (12), and the second shifting block (42) is movably abutted against the inclined surface (13) of the long block (11).

5. A magnetic lock is characterized by comprising a bolt small-angle toggle structure according to any one of claims 1 to 4, wherein a bolt pulling plate (10) is movably arranged in a lock shell (20) and can move back and forth along the lock shell (20), a bolt (50) is arranged at the front end of the bolt pulling plate (10), a bolt hole (23) which can enable the bolt (50) to move back and forth along with the bolt pulling plate (10) and further extend out of the lock shell (20) or retract into the lock shell (20) is formed in the front end wall surface of the lock shell (20) in a penetrating manner, a lock catch (60) which can be arranged on a door frame and can accommodate the bolt (50) is arranged on one side of the front end of the lock shell (20), and a handle hole (24) corresponding to the first through hole (31) is formed in the outer wall of the lock shell (20) in a penetrating manner.

6. The magnetic attraction lock according to claim 5, characterized in that the lock tongue (50) comprises a lock tongue body (51) fixed at the front end of the lock tongue pulling plate (10), and a first magnetic attraction block (52), a lock tongue shell (53) is wrapped outside the lock tongue body (51), and the first magnetic attraction block (52) is wrapped and fixed at the front end of the lock tongue body (51) through the lock tongue shell (53).

7. The magnetic lock according to claim 6, wherein the lock catch (60) comprises a lock catch housing (61) which is concave, an inner frame (62) which is also concave is embedded in the lock catch housing (61), the inner frame (62) is clamped with the left and right side wall surfaces of the inner cavity of the lock catch housing (61) through buckles (63) which are convex at the left and right ends, and a second magnetic block (64) which can adsorb the first magnetic block (52) is embedded in the inner frame (62).

8. The lock of claim 7, wherein the bottom of the inner frame (62) is provided with a receiving slot (621) having at least one short edge opening, and the second magnetic block (64) is inserted into the receiving slot (621) through the short edge opening for fixing.

9. A lock according to claim 8, wherein screw holes (65) are formed through the lock housing (61) and the inner frame (62) in a front-rear direction for screwing screws.

10. The magnetic suction lock according to claim 5, wherein the lock case (20) comprises an upper case (21) and a lower case (22) fastened to the bottom of the upper case (21) to form a lock case (20) with a hollow inner cavity, the lock tongue pulling plate (10) is arranged in the hollow inner cavity of the lock case (20), a strip-shaped groove (14) with an opening at the tail part penetrates through the center of the lock tongue pulling plate (10) along the length of the lock tongue pulling plate (10), the shifting wheel (30) is arranged at the opening at the tail part of the strip-shaped groove (14), the abutting block (1) is arranged on the upper surface of the tail part of the lock tongue pulling plate (10) at two sides of the strip-shaped groove (14), and the shifting button (70) is rotatably arranged in the hollow inner cavity of the lock case (20), correspond the position of dialling button (70) and be equipped with locking hole (25) on last casing (21) and lower casing (22), run through at the axle center department of dialling button (70) and be equipped with second through-hole (72) that can hold the back lock button and connect the locking piece (80) that can move back and forth in bar groove (14) internalization is set up and is can be in bar groove (14) be equipped with on the circumference outer wall of dialling button (70) can rotate along with dialling button (70), and then promote lug (71) that locking piece (80) shift back groove (32) have in the center of thumb wheel (30) locking piece (80) tail end is equipped with and can inserts along with locking piece (80) shift back and insert An insert (81) in the groove (32) to prevent the dial wheel (30) from rotating.