1. The utility model provides a structure is locked to reversal of lock, includes preceding handle components, front panel, preceding rotor, square core and back handle components, preceding handle components includes preceding handle and preceding swivel mount, preceding swivel mount is provided with promotion portion, and preceding swivel mount sets up on the panel in front with the rotation mode, its characterized in that:

one end of the front rotary seat is connected with a front handle, the other end of the front rotary seat is connected with a front rotary piece, the front rotary piece is provided with a pushing part, one end of the square core is connected with the front rotary piece, the other end of the square core is connected with a rear handle assembly, the rear handle assembly controls the square core to rotate, and the front rotary piece rotates along with the square core;

the positioning piece is provided with a positioning opening, the positioning piece is arranged on the front panel in a rotating mode, the first torsion spring is arranged on the front panel, one end of the first torsion spring abuts against the front panel, the other end of the first torsion spring abuts against the positioning piece, and the first torsion spring forms a resetting mechanism of the positioning piece;

the locking plate is provided with the stop part, and the locking plate sets up on the front panel with the rotation mode, the second torsional spring sets up on the front panel, and second torsional spring one end is supported and is leaned on the front panel, and the second torsional spring other end supports and leans on the locking plate, and the second torsional spring constitutes the canceling release mechanical system of locking plate, spacer and locking plate draw close each other.

2. A lock reversing structure of a door lock according to claim 1, wherein: the front rotating piece is provided with sliding grooves at intervals along the circumferential direction, the center of the front rotating piece is provided with a square core socket, the front rotating seat is provided with a limiting column, the limiting column is inserted into the sliding grooves, the square core penetrates through the square core socket, the front rotating piece and the square core are clamped, and the square core and the front rotating piece rotate synchronously.

3. A lock reversing structure of a door lock according to claim 1, wherein: the top that the front panel corresponds preceding swivel mount is provided with spacing, and the bottom that the front panel corresponds preceding swivel mount is provided with down spacing, the top and the bottom of preceding swivel mount are provided with respectively promote the portion, promote the portion and lean on when corresponding last spacing or lower spacing, go up spacing or lower spacing restriction preceding swivel mount rotation.

4. A lock reversing structure of a door lock according to claim 1, wherein: the top and the bottom of the front rotating piece are respectively provided with the pushing part, and when the pushing part is abutted against the corresponding upper limit or lower limit, the upper limit or lower limit limits the rotation of the front rotating piece.

5. A lock reversing structure of a door lock according to claim 1, wherein: one end of the positioning sheet is a contact part, the position of the outer wall of the positioning sheet, which is close to the contact part, is provided with the positioning opening, and a first arc-shaped transition surface is arranged between the positioning opening and the contact part.

6. An anti-lock structure of a door lock according to claim 5, wherein: one end of the locking plate is a locking hook, a second arc-shaped transition surface is arranged at the locking hook, the surface of the locking plate facing the front panel is provided with the blocking part, and the locking hook enters the positioning hole to clamp the locking plate and the positioning plate.

7. A lock reversing structure of a door lock according to claim 1, wherein: the locating piece is vertical mode setting on the front panel, the locking plate is horizontal mode setting on the front panel.

8. A lock reversing structure of a door lock according to claim 1, wherein: the first torsion spring pushes the positioning plate to move towards the direction of the locking plate, and the second torsion spring pushes the locking plate to move towards the direction of the positioning plate.

9. A lock reversing structure of a door lock according to claim 1, wherein: the rear handle assembly comprises a rear handle and a rear rotating seat, the rear rotating seat is arranged on the rear panel in a rotating mode, one end of the rear rotating seat is connected with the rear handle, the other end of the rear rotating seat is connected with the square core, and the rear handle, the rear rotating seat and the square core are linked.

10. A lock reversing structure of a door lock according to claim 9, wherein: still include back revolving fragment, the central point of back revolving fragment puts and opens there is square core socket, and the surface of back revolving fragment is opened along its circumferencial direction interval and is had the jack, back roating seat is provided with inserts the post, it inserts in the jack to insert the post, the other end of square core inserts in the square core socket of back revolving fragment, back handle, back roating seat, back revolving fragment and square core interlock.

Background

The door lock with the back locking function is very many in advantages, firstly, the door lock is very convenient to operate, the door lock is that the handle is lifted in a room, the door can be automatically locked, and the door lock can be used by the old and children and is easy to operate.

However, in order to realize the function of lifting and locking reversely, the existing door lock has the problems of complex lock body structure, more parts, complex assembly and low production efficiency.

Disclosure of Invention

The invention aims to provide a back locking structure of a door lock, which has a simple and reliable structure.

The purpose of the invention is realized as follows:

a back locking structure of a door lock comprises a front handle assembly, a front panel, a front rotary piece, a square core and a rear handle assembly, wherein the front handle assembly comprises a front handle and a front rotary seat, the front rotary seat is provided with a pushing part, the front rotary seat is arranged on the front panel in a rotary mode, one end of the front rotary seat is connected with the front handle, the other end of the front rotary seat is connected with the front rotary piece, the front rotary piece is provided with a pushing part, one end of the square core is connected with the front rotary piece, the other end of the square core is connected with the rear handle assembly, the rear handle assembly controls the square core to rotate, and the front rotary piece rotates along with the square core; the positioning piece is provided with a positioning opening, the positioning piece is arranged on the front panel in a rotating mode, the first torsion spring is arranged on the front panel, one end of the first torsion spring abuts against the front panel, the other end of the first torsion spring abuts against the positioning piece, and the first torsion spring forms a resetting mechanism of the positioning piece; the locking plate is provided with the stop part, and the locking plate sets up on the front panel with the rotation mode, the second torsional spring sets up on the front panel, and second torsional spring one end is supported and is leaned on the front panel, and the second torsional spring other end supports and leans on the locking plate, and the second torsional spring constitutes the canceling release mechanical system of locking plate, spacer and locking plate draw close each other.

The back handle subassembly drives preceding rotor plate rotation through square core, and when back handle subassembly lifted, preceding rotor plate promoted the spacer and rotates, makes the locking plate break away from the location mouth, leads to the stopping part of locking plate to support the front end of the promotion portion of rotating seat in the front, and preceding rotating seat can't corotation, can't push down promptly, realizes lifting the anti-lock function.

The back handle subassembly passes through the square core and drives preceding rotor plate rotatory, and when back handle subassembly pushed down, preceding rotor plate promoted the spacer and rotates, makes the locking plate get into the location mouth, leads to the blocking portion of locking plate to keep away from preceding rotor plate's promotion portion, and preceding rotor plate freely rotates, and preceding handle can push down.

The position of the locking plate can be adjusted by lifting or pressing the rear handle component, the blocking part of the locking plate blocks or is far away from the pushing part of the front rotary seat, the function of locking or unlocking is realized, and the operation is very simple.

The aim of the invention can also be solved by the following technical measures:

furthermore, the front rotating piece is provided with sliding grooves at intervals along the circumferential direction, a square core socket is formed in the center of the front rotating piece, the front rotating seat is provided with a limiting column, the limiting column is inserted into the sliding grooves, the square core penetrates through the square core socket, the front rotating piece and the square core are clamped, and the square core and the front rotating piece rotate synchronously.

Further, the top that the front panel corresponds preceding swivel mount is provided with spacing, and the bottom that the front panel corresponds preceding swivel mount is provided with down spacing, the top and the bottom of preceding swivel mount are provided with respectively push away the portion, push away the portion and lean on when corresponding last spacing or lower spacing, go up spacing or lower spacing restriction preceding swivel mount rotation.

When the current handle subassembly is in the unblock state, preceding handle pushes down, and preceding handle drives preceding swivel mount corotation, because preceding swivel mount's spacing post supports and leans on the lower extreme at the spout, preceding swivel piece corotation is promoted during preceding swivel mount corotation, and preceding swivel piece corotation is followed to the square core, and the front panel is provided with down spacingly moreover, and preceding the portion of carrying out of swivel mount bottom supports and leans on when spacing down, and preceding handle can't continue corotation.

When the current handle is in unblock state or anti-lock state, preceding handle lifts, and preceding handle drives preceding swivel mount and reverses, because in the spout is arranged in to preceding swivel mount's spacing post, when preceding swivel mount reverses, spacing post slided along the spout, and preceding handle is in idle running state, and the front panel is provided with in addition spacingly, and the promotion portion at preceding swivel mount top supports to lean on when last spacing, and preceding handle can't continue to reverse.

Furthermore, the top and the bottom of the front rotating piece are respectively provided with the pushing part, and when the pushing part abuts against the corresponding upper limit or the lower limit, the upper limit or the lower limit limits the rotation of the front rotating piece.

Furthermore, one end of the positioning sheet is a contact part, the position of the outer wall of the positioning sheet, which is close to the contact part, is provided with the positioning opening, and a first arc-shaped transition surface is arranged between the positioning opening and the contact part. Through being provided with first arc transition face, the locking plate of being convenient for slides along first arc transition face, is convenient for promote the spacer rotation.

Further, an end of the locking plate is a locking hook, a second arc-shaped transition surface is arranged at the locking hook, the blocking portion is arranged on the surface of the locking plate facing the front panel, and the locking hook enters the positioning hole to clamp the locking plate and the positioning plate. Through being provided with second arc transition face, the spacer of being convenient for slides along second arc transition face, and the locking plate of being convenient for promote is rotatory, and the locking plate is provided with the latch hook moreover, and the latch hook gets into or leaves the location mouth, realizes that locking plate and spacer are connected or separate.

Further, the locating piece is vertical mode setting on the front panel, the locking plate is horizontal mode setting on the front panel.

Furthermore, the first torsion spring pushes the positioning plate to be drawn close to the direction of the locking plate, and the second torsion spring pushes the locking plate to be drawn close to the direction of the positioning plate.

Further, still include the rear panel, back handle subassembly includes back handle and back roating seat, back roating seat sets up on the rear panel with the rotation mode, and back handle is connected to back roating seat one end, and the back roating seat other end is connected the square core, back handle, back roating seat and square core interlock.

Further, still include the back revolving fragment, the central point of back revolving fragment puts and opens there is the square core socket, and the surface of back revolving fragment is opened along its circumferencial direction interval and is had the jack, the back roating seat is provided with inserts the post, it inserts in the jack to insert the post, the other end of square core inserts in the square core socket of back revolving fragment, back handle, back roating seat, back revolving fragment and square core interlock.

The invention has the following beneficial effects:

according to the invention, the rear handle assembly drives the front rotating piece to rotate through the square core, when the rear handle assembly is lifted up, the front rotating piece pushes the positioning piece to rotate, so that the locking plate is separated from the positioning opening, the blocking part of the locking plate is abutted against the front end of the pushing part of the front rotating seat, the front rotating seat cannot rotate forwards, namely cannot be pressed downwards, and the lifting and reverse locking function is realized.

According to the invention, the rear handle assembly drives the front rotating piece to rotate through the square core, when the rear handle assembly is pressed down, the front rotating piece pushes the positioning piece to rotate, so that the locking plate enters the positioning opening, the blocking part of the locking plate is far away from the pushing part of the front rotating seat, the front rotating seat rotates freely, and the front handle can be pressed down.

According to the invention, the position of the locking plate can be adjusted by lifting or pressing the rear handle assembly, so that the blocking part of the locking plate blocks or is far away from the pushing part of the front rotary seat, the function of back locking or unlocking is realized, and the operation is very simple.

According to the invention, the first arc-shaped transition surface is arranged, so that the locking plate can conveniently slide along the first arc-shaped transition surface and the positioning plate can be conveniently pushed to rotate, the second arc-shaped transition surface is arranged, so that the positioning plate can conveniently slide along the second arc-shaped transition surface and the locking plate can be conveniently pushed to rotate, the locking plate is provided with the locking hook, and the locking hook enters or leaves the positioning opening, so that the locking plate and the positioning plate can be connected or separated.

Drawings

FIG. 1 is a schematic view of a front handle assembly and a rear handle assembly connected by a square core.

Fig. 2 is a schematic cross-sectional view of fig. 1.

Fig. 3 is another angular cross-sectional view of fig. 1.

Fig. 4 is another angular cross-sectional view of fig. 1.

Fig. 5 is another angular cross-sectional view of fig. 1.

FIG. 6 is a schematic view of the connection of the front handle assembly and the front panel.

FIG. 7 is a front view of the front handle assembly and front panel connection (unlocked except for the front handle).

FIG. 8 is a schematic view of the assembly of the front handle assembly and the front panel (in an unlocked state except for the front handle).

FIG. 9 is another angular assembly view of the front handle assembly and front panel (in an unlocked position except for the front handle).

FIG. 10 is an exploded view of the front handle assembly and front panel. (in the unlocked state).

FIG. 11 is another angle exploded view of the front handle assembly and front panel. (in the unlocked state).

FIG. 12 is a schematic view of the connection of the front handle assembly and the front panel.

FIG. 13 is a front view of the front handle assembly and front panel coupled (in a locked position except for the front handle).

FIG. 14 is a schematic view of the assembly of the front handle assembly and the front panel (in the unlocked position except for the front handle).

FIG. 15 is another angular assembly view of the front handle assembly and front panel (in a locked state except for the front handle).

FIG. 16 is an exploded view of the front handle assembly and front panel. (in an unlocked state).

FIG. 17 is another angle exploded view of the front handle assembly and front panel. (in an unlocked state).

FIG. 18 is an exploded view of the rear handle assembly and rear panel.

FIG. 19 is a schematic view of a spacer.

Fig. 20 is a schematic view of the locking plate.

Fig. 21 is a schematic view of the front handle assembly (unlocked state, front handle depressed).

FIG. 22 is a schematic view of the front handle assembly (unlocked state, front handle up).

FIG. 23 is a schematic view of the front handle assembly (back locked condition, front handle pressed down).

Detailed Description

The invention is further described with reference to the following figures and examples:

embodiment, as shown in fig. 1 to 23, a back locking structure of a door lock includes a front handle assembly 1, a front panel 100, a front rotary plate 3, a square core 4, a rear handle assembly 5, a rear rotary plate 6, a rear panel 200, a slider 7, a spring 300, a positioning plate 8, a first torsion spring 400, a locking plate 9 and a second torsion spring 500, the front handle assembly 1 includes a front handle 11, a front rotary seat 12 and a front coil spring 13, and the rear handle assembly 5 includes a rear handle 51, a rear rotary seat 52 and a rear coil spring 53.

The surface of the front rotating piece 3 is provided with sliding grooves 31 at intervals along the circumferential direction, the center of the front rotating piece 3 is provided with a square core socket 32, and the top and the bottom of the front rotating piece 3 are respectively provided with a pushing part 33.

The surface of preceding swivel mount 12 is provided with spacing post 121, and the top and the bottom of preceding swivel mount 12 are provided with promotion portion 122 respectively, preceding swivel mount 12 sets up on front panel 100 with the rotation mode, front panel 100 corresponds the top of preceding swivel mount 12 and is provided with spacing 102, and front panel 100 corresponds the bottom of preceding swivel mount 12 and is provided with down spacing 103, handle 11 before panel 100 outer joint is stretched out to preceding swivel mount 12's one end, spacing post 121 of preceding swivel mount 12 other end inserts in spout 31, realizes that preceding handle 11, preceding swivel mount 12 and preceding rotor plate 3 connect.

The front coil spring 13 is arranged on the front panel 100, the front coil spring 13 is connected with the front rotary seat 12, the front coil spring 13 forms a reset mechanism of the front rotary seat 12, the pushing part 33 abuts against a baffle of the sliding block 7, and the pushing part 33 pushes the sliding block 7 to slide.

One end of the positioning plate 8 is a contact part 81, a positioning opening 82 is formed in the outer wall of the positioning plate 8 close to the contact part 81, a first arc-shaped transition surface 83 is arranged between the positioning opening 82 and the contact part 81, the positioning plate 8 is vertically arranged on the front panel 100, the first torsion spring 400 is arranged on the front panel 100, one end of the first torsion spring 400 abuts against the front panel 100, the other end of the first torsion spring 400 abuts against the positioning plate 8, and the first torsion spring 400 forms a reset mechanism of the positioning plate 8.

The front panel 100 is provided with a transverse sliding groove 101, the slider 7 is provided with a baffle 71, the slider 7 is arranged in the transverse sliding groove 101 in a transverse sliding mode, one end of the spring 300 abuts against the baffle 71, the other end of the spring 300 abuts against the inner wall of the transverse sliding groove 101, the spring 300 is in a state of maintaining and pushing the slider 7, the spring 300 forms a reset mechanism of the slider 7, the pushing part 33 at the bottom of the front rotary seat 12 and the pushing part at the bottom of the front rotary piece 3 abut against the baffle 71 of the slider 7, and when the slider 7 is reset, the slider 7 pushes the front rotary seat 12 and the front rotary piece 3 to rotate.

One end of the locking plate 9 is a locking hook 91, a second arc-shaped transition surface 1 is arranged at the locking hook 91, the blocking part 93 is arranged on the surface of the locking plate 9 facing the front panel 100, and the locking hook 91 enters the positioning opening 82 to clamp the locking plate 9 and the positioning plate 8. The locking plate 9 sets up on front panel 100 with horizontal mode, second torsion spring 500 sets up on front panel 100, and second torsion spring 500 one end is supported and is leaned on front panel 100, and the second torsion spring 500 other end supports and leans on locking plate 9, and second torsion spring 500 constitutes locking plate 9's canceling release mechanical system.

The first torsion spring 400 pushes the positioning plate 8 to move toward the locking plate 9, and the second torsion spring 500 pushes the locking plate 9 to move toward the positioning plate 8.

The surface of the rear rotating piece 6 is provided with inserting holes 61 at intervals along the circumferential direction, the central position of the rear rotating piece 6 is provided with a square core inserting hole 32, and the top and the bottom of the rear rotating piece 6 are respectively provided with a pushing part 33.

The surface of the rear rotary seat 52 is provided with an inserting column 521, the bottom of the rear rotary seat 52 is provided with a pushing part 33, the rear rotary seat 52 is rotatably arranged on the rear panel 200, one end of the rear rotary seat 52 extends out of the rear panel 200 and is connected with the rear handle 51, and the inserting column 521 at the other end of the rear rotary seat 52 is inserted into the inserting hole 61, so that the linkage of the rear handle 51, the rear rotary seat 52 and the rear rotary sheet 6 is realized.

The rear coil spring 53 is arranged on the rear panel 200, the rear coil spring 53 is connected with the rear rotary seat 52, the rear coil spring 53 forms a reset mechanism of the rear rotary seat 52, the pushing part 33 abuts against the baffle 71 of the sliding block 7, and the pushing part 33 pushes the sliding block 7 to slide.

The rear panel 200 is provided with a rear transverse sliding groove 101, the slider 7 is provided with a baffle 71, the slider 7 is arranged in the transverse sliding groove 101 in a transverse sliding mode, one end of the spring 300 abuts against the baffle 71, the other end of the spring 300 abuts against the inner wall of the transverse sliding groove 101, the spring 300 is in a state of maintaining and pushing the slider 7, the spring 300 forms a reset mechanism of the slider 7, the pushing portion 33 at the bottom of the rear rotating seat 52 and the pushing portion at the bottom of the rear rotating piece 6 abut against the baffle 71 of the slider 7, and when the slider 7 is reset, the slider 7 pushes the rear rotating seat 52 and the rear rotating piece 6 to rotate.

One end of the square core 4 is inserted into the square core socket 32 of the front rotating piece 3, and the other end of the square core 4 is inserted into the square core socket 32 of the rear rotating piece 6.

When preceding handle subassembly 1 was in the unblock state, current handle 11 pushes down, and preceding handle 11 drives preceding swivel mount 12 corotation, and preceding swivel mount 12 drives preceding rotor plate 3 you now, and square core 4 is followed preceding rotor plate 3 corotation, and current handle 11 lifts, and preceding swivel mount idles, and preceding rotor plate 3 does not move, and square core does not move.

When the rear handle 51 is pressed down, the rear handle 51 drives the rear rotary seat 52 to rotate forward, the rear rotary seat 52 drives the rear rotary piece 6 to rotate forward, and the square core 4 rotates forward along with the rear rotary piece 6.

When the rear handle 51 is lifted up, the rear handle 51 drives the rear rotating seat 52 to rotate reversely, the rear rotating seat 52 drives the rear rotating piece 6 to rotate reversely, the square core 4 rotates reversely along with the rear rotating piece 6, meanwhile, the rear rotating piece 6 rotates reversely to control the front handle assembly 1 to lock reversely, and at the moment, the front handle 11 cannot rotate forwardly.

The working principle is as follows:

the rear handle 51 is lifted up to perform the back locking:

when the rear handle 51 is lifted, the rear handle 51 drives the front rotary piece 3 to rotate reversely through the rear rotary seat 52, the rear rotary piece 6 and the square core 4, the pushing part 33 of the front rotary piece 3 overcomes the torsion of the first torsion spring 400 to push the positioning piece 8 to rotate positively, at the moment, the torsion of the second torsion spring 500 pushes the locking piece 9 to rotate negatively, the locking hook 91 of the locking piece 9 is separated from the positioning opening 82 of the positioning piece 8, the blocking part 93 of the locking piece 9 abuts against the front end of the pushing part 122 of the front rotary seat 12, so that the front rotary seat 12 cannot rotate positively, and the reverse locking of the front handle assembly is realized.

When the lock is in the reverse locking state, the front handle can only be lifted up:

at this time, the front handle 11 can only be lifted up, the front handle 11 drives the front swivel base 12 to rotate reversely, because the limiting column 121 of the front swivel base 12 is arranged in the sliding groove 31, when the front swivel base 12 rotates reversely, the limiting column 121 slides along the sliding groove 31, the front handle 11 is in an idle state, but when the pushing part 122 at the top of the front swivel base 12 abuts against the upper limiting part 102, the front handle 11 cannot rotate continuously.

The rear handle 51 is pressed down to unlock:

when back handle 51 pushes down, back handle 51 passes through back roating seat 52, back revolving fragment 6 and square core 4 drive preceding revolving fragment 3 corotation, the portion of pushing away 33 of preceding revolving fragment 3 overcomes the torsion promotion locking plate 9 corotation of second torsional spring 500, locking plate 9 promotes the corotation of spacer 8 simultaneously, until locking hook 91 of locking plate 9 gets into in the locating hole 82 of spacer 8, the portion of pushing away 122 of preceding revolving fragment 12 is kept away from to the portion of blocking 93 of locking plate 9 this moment, make preceding handle subassembly 1 be in the unblock state, preceding revolving fragment 12 can freely rotate, but the portion of pushing away 33 of preceding revolving fragment 3 bottom supports when spacing 103 down, preceding revolving fragment 3 can't continue corotation.

When the lock is unlocked, the front handle can be pressed down and lifted up:

when the front handle 11 is pressed down, the front handle 11 drives the square core 4 to rotate forward through the front rotating seat 12 and the front rotating sheet 3, but the pushing part 122 at the bottom of the front rotating seat 12 abuts against the lower limit 103, and the front rotating seat 12 cannot continue to rotate forward.

When the front handle 11 is lifted up, the front handle 11 drives the front swivel base 12 to rotate reversely, because the limiting column 121 of the front swivel base 12 is arranged in the sliding groove 31, when the front swivel base 12 rotates reversely, the limiting column 121 slides along the sliding groove 31, the front handle 11 is in an idle state, but the pushing part 122 at the top of the front swivel base 12 abuts against the upper limiting part 102, and the front handle 11 cannot rotate continuously.

The square core is connected with the bolt of the lock body, so that the square core can rotate forwards and backwards to control the bolt to stretch and retract, and the lock or the unlock of the door lock can be controlled.

The anti-loosening principle of the front handle 11 is as follows:

the front handle 11 is connected with the front rotary seat 12, the elastic force of the spring 300 always maintains the state of pushing the slider 7, so that the slider 7 is prevented from loosening, the pushing part 122 of the front rotary seat 12 abuts against the baffle 71, the elastic force of the front coil spring 13 always maintains the state of pushing the front rotary seat 12, and under the combined action of the spring 300 and the front coil spring 13, the pushing part 122 of the front rotary seat 12 is always tightly attached to the baffle 71, so that a gap is not generated, the front rotary seat 12 is prevented from loosening, and the front rotary seat 12 is prevented from loosening.

The front rotor 3 is connected to the front rotor 12, the pushing portion 33 at the bottom of the front rotor 3 abuts on the stopper 71, and when the slider 7 is reset, the slider 7 pushes the pushing portion 33, thereby pushing the front rotor 3 to reset.

Anti-loosening principle of the rear handle 51:

the rear handle 51 is connected with the rear rotary seat 52, the elastic force of the spring 300 always keeps the state of pushing the slider 7 to avoid the slider 7 from loosening, the pushing part 122 of the rear rotary seat 52 abuts against the baffle 71, the elastic force of the rear coil spring 53 always keeps pushing the rear rotary seat 52, and under the combined action of the spring 300 and the rear coil spring 53, the pushing part 122 of the rear rotary seat 52 always clings to the baffle 71 without generating a gap to avoid the rear rotary seat 52 from loosening, thereby avoiding the rear rotary seat 52 from loosening.

Furthermore, the rear rotary plate 6 is connected with the rear rotary seat 52, the pushing portion 33 at the bottom of the rear rotary plate 6 abuts against the baffle 71, and when the slide block 7 is reset, the slide block 7 pushes the pushing portion 33, thereby pushing the rear rotary plate 6 to reset.