CN207779234U - A kind of negative drawing unlock retractable spontoon - Google Patents

Abstract

The utility model discloses a kind of negative drawings to unlock retractable spontoon, including holding rod and strike bar, and the one end for hitting bar is plugged in holding rod；It is equipped with locker on holding rod, unlock driving mechanism is connected in the rear end of holding rod, is connected with the unlocking mechanism that can be acted on locker in the rear end of strike bar, drawstring is equipped between unlock driving mechanism and unlocking mechanism.The structure of the utility model, is unlocked by the way of pulling back, and reduces the volume and occupied space of unlocking mechanism, after hitting bar recycling, is had in holding rod and is more utilized space.

Description

A kind of negative drawing unlock retractable spontoon

Technical field

The utility model is related to retractable spontoons.

Background technology

Retractable spontoon is a kind of alert tool, and retractable spontoon is telescopic when unused, using then by throwing away use.

There are mainly two types of structures for current retractable spontoon, and one is resistance structure, another kind is to realize lock by mechanical structure Only and unlock.

Chinese Patent Application No. be 201710269991.7 applyings date be 2017.4.24 patent document in disclose one Kind Telescopic spontoon.Including outer tube；Middle pipe；After manage；Middle pipe locking mechanism；Pipe locking mechanism afterwards；Unlocking mechanism；Impact head, Feature is：Middle pipe locking mechanism includes the first drum butterfly, the second drum butterfly and a pair of drum abjusting spring, and the first drum butterfly slides with the first drum butterfly Vallecular cavity is slidably matched, and the first drum butterfly side of tube chamber in has the first drum butterfly ear, the middle position of the first drum butterfly ear to have first Butterfly solution lockhole is roused, has the first drum butterfly protecting against shock slot, the second drum butterfly side of tube chamber in have the second drum on the right side of the first drum butterfly Butterfly ear, second rouses on butterfly ear and sets the second drum butterfly solution lockhole, the right side of the second drum butterfly corresponding to the position of the first drum butterfly solution lockhole There are the second drum butterfly protecting against shock slot, a pair of drum abjusting spring to be supported between the first drum butterfly and the second drum butterfly.Ensure the left end of middle pipe with The right end positive lock of outer tube, the left end of rear pipe is same as the right end of middle pipe can be by positive lock.The unlocking mechanism includes Support cap, unlock rod fixed seat, unblock button, unlock spring and unlock rod, the left end mating of support cap and the outer tube and It is insinuated into the outer lumen, which has a unlock spring cavity, unlock rod fixed seat and the bearing for being opened in support cap The unlock rod fixed seat matching hole of the middle position of base wall is slidably matched, and the position that unblock button corresponds to unlock spring cavity is set It sets, unlock spring is located in unlock spring cavity, and one end of the springlock spring is supported on unblock button towards unlock rod fixed seat Side, and the other end for unlocking spring is supported on the support cap bottom wall towards the side of unlock spring cavity, and unlock rod is located at In the outer lumen, the unlock rod left end composition have a screw head, the screw head screw in successively unlock rod fixed seat with And unblock button, it is formed with a unlock rod guide head in the right end of unlock rod, the unlock rod guide head and the first drum butterfly It solves lockhole and the second drum butterfly solution lockhole is corresponding.

The Telescopic spontoon of above structure, when unused, middle pipe and rear pipe are retracted in outer tube, and unlock rod promotes first Drum dish, the second drum dish overcome bulging dish spring to move inwardly, and equally, unlock rod promotes third drum dish, the 4th drum dish to overcome bulging dish Spring moves inwardly.Such as need to use baton, hold outer tube, throw away middle pipe and rear pipe outward, at this time middle pipe locking mechanism with It is moved with middle pipe, rear pipe locking mechanism is moved with subsequent pipe, when the first drum dish and the second drum dish move at unlock rod guide head When, the first drum dish and the second drum dish move out under the action of drum dish spring, and the first drum dish and second rouses dish holding to middle pipe In lock slots, when middle pipe locking mechanism moves at guide head, rear pipe locking mechanism has been detached from unlock rod, when after pipe lock When after mechanism kinematic arriving at pipe lock slots, third drum dish and the 4th drum dish move out under the action of drum dish spring, third drum After dish and the 4th drum dish holding are arrived in pipe lock slots.It such as needs to withdraw baton, being unlocked by pressing mechanism, unlock rod is applied to the first drum Dish and the second drum dish, under the action of unlock rod, the first drum dish and the second drum dish overcome the elastic force of bulging dish spring inwardly to move, the One drum dish and the second drum dish are detached from middle pipe lock slots, and middle pipe is retracted into outer tube, while rear pipe follows middle pipe to move, when middle pipe contracts After returning to outer tube in place, being unlocked by pressing mechanism, unlock rod is applied to third drum dish and the 4th drum dish, under the action of unlock rod, Third rouses dish and the 4th drum dish overcomes the elastic force of bulging dish spring inwardly to move, and pipe locks after third rouses dish and the 4th drum dish disengaging Slot, rear pipe are retracted into middle pipe.The structure will realize that the locking that throws away of middle pipe and rear pipe, middle pipe lock slots have to close to outer The rear end of pipe is arranged, and rear pipe lock slots have to be arranged close to the rear end of middle pipe, in this way, the length of unlock rod is bound to occupy outside Most of position of pipe axial space, and guide head need backwards, when middle pipe and after pipe retract after, outer tube internal cause is unlocked bar It occupies and does not utilize space more.In addition, unlock rod needs are fixedly connected with unlocking mechanism could realize above-mentioned stretch The function of formula baton.

By the retrieval to other documents, it is found that the unlock rod of current retractable spontoon is to push to realize unlock forward, all Need to occupy most of axial space of holding rod, the length of unlock rod is longer, and the solution lock end of unlock rod is arranged forward.

Invention content

The purpose of this utility model is to provide a kind of negative drawing unlock retractable spontoon, and the structure of the utility model uses The mode pulled back is unlocked, and reduces the volume and occupied space of unlocking mechanism, after hitting bar recycling, is had in holding rod more Utilize space.

In order to achieve the above objectives, a kind of negative drawing unlocks retractable spontoon, including holding rod and strike bar, hits one end of bar It is plugged in holding rod；It is equipped with locker on holding rod, unlock driving mechanism is connected in the rear end of holding rod, after hitting bar End is connected with the unlocking mechanism that can be acted on locker, and drawstring is equipped between unlock driving mechanism and unlocking mechanism.

Above-mentioned negative drawing unlocks retractable spontoon, such as needs to use, and throws away or pull out strike bar forward, when unlocking mechanism is transported When moving at locker, unlocking mechanism snaps onto in locker, avoids strike bar retraction.Strike bar of retracting such as is needed, is led to Crossing unlock driving mechanism gives drawstring one pulling force, and drawstring drives unlocking mechanism clear lockers, and strike bar is retracted.In the knot It in structure, is realized and is unlocked using pulling force, unlocking mechanism only needs the very little for being arranged in the rear end of strike bar and occupying strike rod rear end Space can be realized strike bar recycling, when hit bar recycling after, unlocking mechanism is located in the rear end of outer tube, in outer tube before It has been released in end largely using space, which can install other such as capsicum water bottles, torch auxiliary.Therefore, originally Utility model unlock rod setting overcome existing unlock rod be arranged forward and to be pushed forward realize unlock technology prejudice.

Further, the unlock driving mechanism includes pedestal and pressing withdrawing device, and pedestal is connected on holding rod, presses It pushes back to load and be set on pedestal, drawstring is connected between pressing withdrawing device and unlocking mechanism.When positioned at pressing withdrawing device When one pressure, unlocking mechanism pulling force is given in drawstring counter motion, realizes unlock.

Further, the pressing withdrawing device includes compression bar, briquetting, link mechanism and swing arm；Briquetting is connected to pressure The front end of the rear end of bar, compression bar passes through pedestal, swing arm to be hinged on pedestal, and link mechanism is connected between compression bar and swing arm, Dynamic clamping head and quiet clamping head is cased on compression bar between pedestal and briquetting.The structure such as needs to unlock, and presses briquetting, briquetting band dynamic pressure Bar overcomes the elastic force of dynamic clamping head and quiet clamping head to travel forward, and compression bar drives swing arm to swing by link mechanism, and swing arm pulls drawstring, to Unlocking mechanism is pulled, using link mechanism, organization volume is small, and can realize the reversed purpose for pulling drawstring.

Further, the pedestal includes base body and two supporting arms that the front end from base body extends forward, There is gap between two supporting arms, be hinged on two supporting arms in the middle part of swing arm, link mechanism is hinged on one end of swing arm, drawstring It is connected to the other end of swing arm.

Further, the link mechanism includes link block and connecting rod, and link block is connected to the front end of compression bar, connecting rod hinge It is connected between swing arm and link block.Using link mechanism, organization volume is small, and can realize the reversed purpose for pulling drawstring.

Further, the unlocking mechanism includes deck, snap ring, unlock rod and elastic component, and deck, which is connected to, to be beaten It hits on bar, blocking part is equipped in deck, equipped with accommodating cavity in deck, radially extend and accommodating cavity phase is equipped on deck Logical sliding vallecular cavity, snap ring are located in accommodating cavity and across sliding vallecular cavities, and snap ring can coordinate with card slot, and unlock rod is worn Blocking part and snap ring are crossed, unlock rod includes big end and small end, and small end is connected to the rear end of big end, in small end It is connected with and keeps out draw ring portion, keep out the rear end that draw ring portion is located at blocking part, blocking part withstands the draw ring portion that keeps out, elastic component connection Between unlock rod and deck, drawstring, which is connected to, keeps out between draw ring portion and pressing withdrawing device.In structure, unlocked not giving Under the premise of draw-bar pull, draw ring portion is kept out under the action of the elastic member and is kept out by blocking part.It such as needs to use, throws away forward or draw Go out to hit bar, when snap ring moves at locker, snap ring moves out, the outer end holding of snap ring to lock In buckle device, strike bar retraction is avoided.Strike bar of retracting such as is needed, gives drawstring one pulling force by unlocking driving mechanism, drawstring Drive is kept out draw ring portion and is moved backward, keeps out draw ring portion and drives unlock rod that the elastic force of elastic component is overcome to move backward, allows big end It is inserted into snap ring, promotes snap ring clear lockers, strike bar is retracted.In this configuration, by reversely pacifying Unlock rod is filled, the small end of unlock rod is allowed to be arranged backwards, and realizes that unlock, unlock rod only need setting in strike bar using pulling force Rear end and occupy strike rod rear end little space can be realized strike bar recycling, when hit bar recycling after, unlocking mechanism In the rear end of outer tube, released largely using space in the middle front end of outer tube.

Further, there is foreboard, unlock rod to pass through foreboard for the front end of deck, and baffle is equipped in the front end of unlock rod, Elastic component is sleeved on the unlock rod of baffle and foreboard.When unlock rod has pulling force, baffle follows unlock rod to move, and promotees Make elastic component that flexible deformation occur.

Further, interconnecting piece is equipped between big end and small end, interconnecting piece is in truncated cone-shaped.In this way, being solved pulling When locking bar, it is easier that big end is allowed to be inserted into snap ring by interconnecting piece.

Further, further include one or more two level strike bar, close to one end grafting of the two level strike bar of strike bar In two level strike bar, other two levels hit bar plug connection successively, and the rear end that bar is hit in two level is equipped with unlocking mechanism, It is equipped with two level card slot in other strike bar front inner walls that the two level except front end hits bar, is connected between adjacent unlocking mechanism It is connected to two level drawstring.The structure such as needs to use, and throws away or pull out two level strike bar, when unlocking mechanism follows two level to hit bar When moving at two level card slot, in snap ring holding to two level card slot.It such as needs to recycle baton, be given by unlocking driving mechanism Drawstring pulling force, drawstring drive are kept out draw ring portion and are moved backward, keep out draw ring portion and unlock rod is driven to overcome the elastic force of elastic component backward Movement, meanwhile, two level drawstring will produce pulling force, and big end is allowed to be inserted into snap ring, promote snap ring be detached from card slot and Two level card slot retracts strike bar and two level strike bar.The structure can realize that two level hits bar using identical unlocking mechanism It retracts, the use length of baton can not only be increased, and it is convenient, fast to retract.

Further, the locker is card slot.

Description of the drawings

Fig. 1 is the stereogram that negative drawing unlocks retractable spontoon.

Fig. 2 is the exploded view that negative drawing unlocks retractable spontoon.

Fig. 3 is the left view that negative drawing unlocks retractable spontoon.

Fig. 4 is the A-A sectional views of Fig. 3.

Fig. 5 is the B-B sectional views of Fig. 3.

Fig. 6 is the schematic diagram of negative drawing unlock retractable spontoon after hitting bar recycling.

Fig. 7 is the stereogram for unlocking driving mechanism.

Fig. 8 is the exploded view for unlocking driving mechanism.

Fig. 9 is the side schematic view for unlocking driving mechanism.

Figure 10 is that unlock driving mechanism C-C cuts open schematic diagram.

Figure 11 is the stereogram of unlocking mechanism.

Figure 12 is the exploded view of unlocking mechanism.

Figure 13 is the side schematic view of unlocking mechanism.

Figure 14 is that unlocking mechanism D-D cuts open schematic diagram.

Specific implementation mode

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

As shown in Figures 1 to 6, negative drawing unlock retractable spontoon includes holding rod 1, strike bar 2, unlock driving mechanism 3, solution Latch mechanism 4 and drawstring 5.

One end of strike bar 2 is plugged in holding rod 1；Locker, the lock are equipped in the front inner wall of holding rod 1 Device is card slot 11；It is connected with unlock driving mechanism 3 in the rear end of holding rod 1, unlocking mechanism 5 is connected in the rear end of strike bar 2, Drawstring 5 is equipped between unlock driving mechanism 3 and unlocking mechanism 4.

As shown in Fig. 2, Fig. 4 to Figure 10, the unlock driving mechanism 3 includes pedestal 31 and pressing withdrawing device, pressing Withdrawing device includes compression bar 32, briquetting 33, link mechanism 34 and swing arm 35.

The pedestal 31 includes base body 311 and two supporting arms extended forward from the front end of base body 311 312.The outer diameter of base body front end 3111 is less than the outer diameter of pedestal ontology rear end 3112, on 3111 outer wall of base body front end Equipped with external screw thread, there is cavity 3113 from back to front in base body, top plate 3114, top plate envelope are equipped in the front end of base body The front end for blocking cavity is equipped with through-hole 3115 on top plate 3114.Base body front end 3111 is connected to holding rod 1 by external screw thread On the inner wall of rear end, since base body front end external diameter is less than base body rear end outer diameter, when pedestal 31 is connected on holding rod 1 Afterwards, 1 outer diameter of outer diameter with holding rod of base body rear end 3112 is essentially identical.There is gap 3121 between two supporting arms 312.

The front end of compression bar 32 passes through through-hole 3115, and the rear end of compression bar 32 is located in cavity 3113.Briquetting 33 is connected to compression bar 32 rear end, in the present embodiment, briquetting 33 are circle, and briquetting 33 is located in cavity 3113, between briquetting 33 and cavity inner wall There is gap.

The link mechanism 34 includes link block 341 and connecting rod 342, and link block 341 is connected to the front end of compression bar 33, even One end of bar 342 is hinged on one end of link block 341.One end of swing arm 35 is hinged on the other end of connecting rod.In swing arm 35 Portion is hinged on two supporting arms 312, has a connecting pole 351 in the other end of swing arm 35, the middle part and swing arm of connecting pole 351 it Between have gap 352.Dynamic clamping head and quiet clamping head 36 is cased between top plate 3114 and briquetting on compression bar 32, dynamic clamping head and quiet clamping head 36 is bullet Spring.

As shown in Fig. 2,4,5,6 and Figure 11 to Figure 14, the unlocking mechanism 4 includes deck 41, snap ring 42, unlock Bar 43 and elastic component 44.

The outer diameter of deck front end 411 is less than the outer diameter of deck rear end 412, and 411 outer wall of deck front end is equipped with external screw thread, card Seat is threadedly attached on the inner wall of strike bar, since the outer diameter of deck front end 411 is less than the outer diameter of deck rear end 412, because This can allow the outer diameter of the outer diameter and strike bar 2 of deck rear end essentially identical after deck is installed on strike bar 2.Deck 41 There is foreboard 413, foreboard 413 to be equipped with first through hole 4131 for front end, blocking part 414 is equipped in deck 41, in blocking part 414 It is equipped with the second through-hole 4141, accommodating cavity 415 is equipped with positioned at the front of blocking part 414 in deck 41, is equipped on deck 41 The sliding vallecular cavity 416 communicated with accommodating cavity 415 radially extended, in the present embodiment, sliding vallecular cavity are provided with two, two cunnings Dynamic vallecular cavity 416 is oppositely arranged relative to the center of deck.

The snap rings 421 that the snap ring 42 is oppositely arranged including two relative to deck center are with setting in two snap rings Between resetting spring 422.Snap ring 421 includes snap ring ontology 4211, is located at 4212 and of fastening part in 4211 outside of snap ring ontology The solution lock ear 4213 being arranged on the inside of snap ring ontology, the thickness of fastening part 4212 are less than the thickness of snap ring ontology 4211, two snap rings On solution lock ear shifted to install in front-rear direction, the solution lock ear on two snap rings have overlapping bit, solution lock ear 4213 on be equipped with solution Lockhole 42131, solution lockhole are waist-shaped hole, and the solution lockhole in two solution lock ears has the overlapping bit being mutually communicated.In no sliding groove Intracavitary sliding is equipped with snap ring 421.

Unlock rod 43 passes through the second through-hole, solution lockhole, first through hole.Unlock rod 43 includes big end 431, small end 432 With interconnecting piece 433, interconnecting piece 433 is truncated cone-shaped, and big end 431 is connected to the front end of interconnecting piece 433, and small end 432 is connected to The rear end of interconnecting piece 433 is connected in small end 433 and keeps out draw ring portion 46, keeps out the rear end that draw ring portion 46 is located at blocking part, Blocking part 414, which is withstood, keeps out draw ring portion 46, and connecting hole 461 is equipped on keeping out draw ring portion 46.It is set in the front end of big end 431 It is spring to have baffle 45, elastic component 44, and spring pocket is on the unlock rod positioned at baffle 45 and foreboard.

It is equipped with connection ring 50 on connecting hole 461, drawstring 5 is connected between connecting pole 351 and connection ring 50, drawstring is Flexible strand etc..

Above-mentioned negative drawing unlocks retractable spontoon, when not pressing briquetting 33, since elastic component 44 is to baffle 45 It acts on, keeps out draw ring portion 46 under the action of elastic component 44 and kept out by blocking part 414.Such as need use baton, throw away forward or Strike bar 2 is pulled out, when snap ring 42 moves at card slot 11, snap ring 421 is under the action of resetting spring 422 to outward transport It is dynamic, it allows in fastening part 4212 holding to card slot 11, avoids strike bar retraction, in the present invention, be located between two snap rings The both sides of unlock rod are respectively equipped with resetting spring 422.Strike bar 2 of retracting such as is needed, briquetting 33 is pressed, briquetting 33 drives compression bar 32 The elastic force of dynamic clamping head and quiet clamping head 36 is overcome to travel forward, compression bar 32 drives link block 341 to move, and link block 341 drives connecting rod 342 to transport Dynamic, connecting rod 342 drives swing arm 35 to swing, and swing arm 35 pulls drawstring 5, the drive of drawstring 5 to keep out draw ring portion 46 and move backward, keeps out drawing Ring portion 46 drives unlock rod 43 that the elastic force of elastic component 44 is overcome to move backward, under the guiding role of interconnecting piece 433, allows big end 431 are inserted into solution lockhole, promote the elastic force that the fastening part of snap ring overcomes resetting spring to be detached from card slot 11, strike bar 2 is retracted. In this configuration, by reversely installing unlock rod, the small end of unlock rod is allowed to be arranged backwards, and unlock, solution are realized using pulling force Locking bar only needs to be arranged in the rear end of strike bar and occupies the little space of strike rod rear end the recycling of strike bar can be realized, when After hitting bar recycling, unlocking mechanism is located in the rear end of outer tube, has been released largely using sky in the middle front end of outer tube Between, which can install other such as capsicum water bottles, torch auxiliary.Therefore, the unlock rod setting of the utility model overcomes The technology prejudice that existing unlock rod is arranged forward.Using link mechanism, organization volume is small, and can realize reversed pulling drawstring Purpose.

Further include one or more two level strike bar, close to the two of strike bar as another structure of the utility model One end of grade strike bar is plugged in two level strike bar, and other two levels hit bar plug connection successively, and bar is hit in two level Rear end is equipped with unlocking mechanism, and two level card slot is equipped in other strike bar front inner walls that the two level except front end hits bar, Two level drawstring is connected between adjacent unlocking mechanism.The structure such as needs to use, and throws away or pulls out two level strike bar, work as solution When latch mechanism follows two level strike bar to move at two level card slot, in snap ring holding to two level card slot.Recycling is such as needed to warn Rod gives drawstring pulling force, drawstring drive to keep out draw ring portion and move backward, keeps out draw ring portion and drive unlock rod by unlocking driving mechanism The elastic force of elastic component is overcome to move backward, meanwhile, two level drawstring will produce pulling force, and big end is allowed to be inserted into snap ring, promote So that snap ring is detached from card slot and two level card slot, strike bar and two level strike bar are retracted.The structure uses identical solution lock machine Structure can realize the retraction of two level strike bar, can not only increase the use length of baton, and it is convenient, fast to retract.

Claims (10)

1. a kind of negative drawing unlocks retractable spontoon, including holding rod and strike bar, the one end for hitting bar is plugged in holding rod；It is special Sign is：It is equipped with locker on holding rod, unlock driving mechanism is connected in the rear end of holding rod, is connected in the rear end of strike bar There is the unlocking mechanism that can be acted on locker, drawstring is equipped between unlock driving mechanism and unlocking mechanism.

2. negative drawing according to claim 1 unlocks retractable spontoon, it is characterised in that：The unlock driving mechanism packet Pedestal and pressing withdrawing device are included, pedestal is connected on holding rod, and pressing withdrawing device is located on pedestal, and drawstring is connected to by pushing back Between drawing device and unlocking mechanism.

3. negative drawing according to claim 2 unlocks retractable spontoon, it is characterised in that：The pressing withdrawing device packet Include compression bar, briquetting, link mechanism and swing arm；Briquetting is connected to the rear end of compression bar, and the front end of compression bar passes through pedestal, swing arm to be hinged on On pedestal, link mechanism is connected between compression bar and swing arm, is cased with dynamic clamping head and quiet clamping head between pedestal and briquetting on compression bar.

4. negative drawing according to claim 3 unlocks retractable spontoon, it is characterised in that：The pedestal includes pedestal sheet Two supporting arms that body and front end from base body extend forward have gap between two supporting arms, are hinged in the middle part of swing arm On two supporting arms, link mechanism is hinged on one end of swing arm, and drawstring is connected to the other end of swing arm.

5. negative drawing according to claim 3 unlocks retractable spontoon, it is characterised in that：The link mechanism includes connecting Block and connecting rod are connect, link block is connected to the front end of compression bar, and connecting rod is hinged between swing arm and link block.

6. negative drawing according to claim 2 unlocks retractable spontoon, it is characterised in that：The unlocking mechanism includes card Seat, snap ring, unlock rod and elastic component, deck are connected on strike bar, blocking part are equipped in deck, is equipped in deck Accommodating cavity, is equipped with the sliding vallecular cavity communicated with accommodating cavity radially extended on deck, and snap ring is located in accommodating cavity and wears Cross sliding vallecular cavity, snap ring can coordinate with card slot, unlock rod pass through blocking part and snap ring, unlock rod include big end and Small end, small end are connected to the rear end of big end, are connected in small end and keep out draw ring portion, keep out draw ring portion and are located at blocking part Rear end, blocking part, which is withstood, keeps out draw ring portion, and elastic component is connected between unlock rod and deck, and drawstring, which is connected to, keeps out draw ring Between portion and pressing withdrawing device.

7. negative drawing according to claim 6 unlocks retractable spontoon, it is characterised in that：The front end of deck has foreboard, Unlock rod passes through foreboard, is equipped with baffle in the front end of unlock rod, elastic component is sleeved on the unlock rod of baffle and foreboard.

8. negative drawing according to claim 6 unlocks retractable spontoon, it is characterised in that：Between big end and small end Equipped with interconnecting piece, interconnecting piece is in truncated cone-shaped.

9. negative drawing according to claim 1 unlocks retractable spontoon, it is characterised in that：It further include one or more two level Bar is hit, is plugged in two level strike bar close to one end of the two level strike bar of strike bar, other two level strike bars are inserted successively It connects in succession, the rear end that bar is hit in two level is equipped with unlocking mechanism, before other strike bars for hitting bar except the two level of front end It holds inner wall to be equipped with two level card slot, two level drawstring is connected between adjacent unlocking mechanism.

10. negative drawing according to claim 1 unlocks retractable spontoon, it is characterised in that：The locker is card Slot.