A kind of intelligent filter triggering lock-fit-type door based on wide cut dead bolt
Technical field
The present invention relates to a kind of intelligent filter triggering lock-fit-type door based on wide cut dead bolt, belongs to smart home technology neck
Domain.
Background technology
Door is the device for stopping or closing a region, and it is mainly made up of door body and door frame, any building
Construction be required for adopting door, and the development with society, the continuous improvement of people's living standard and sets the manufacturer of door
Meter person also constantly is carrying out improving and innovation, the such as patent No. for door:201110099065.2, a kind of door is disclosed, is wrapped
Doorframe, door leaf and switching mechanism is included, the door leaf is hinged on doorframe, between door leaf and doorframe, adopt secondary seal structure, described
Door leaf includes that matrix and thermal insulation layer, the switching mechanism include that rotating shaft, adpting flange, connecting rod and fairlead, the rotating shaft are passed through
Run through the unthreaded hole of door leaf and can rotate in the unthreaded hole, in the inner side of door leaf, the rotating shaft is threadedly coupled with adpting flange, institute
State, connecting rod is through the fairlead being arranged on door leaf.The door of above-mentioned technical proposal design, mainly
It is used as the hatch door of mine escape capsule, to solve cabin door open and close mechanism structure complexity, sealing and the heat-insulated effect of existing mine escape capsule
Really poor problem, also acts as the door of cabin, freezer etc., with the excellent of switching mechanism simple structure, sealing and good heat-insulation effect
Point.
Also number of patent application:201310719569.9, a kind of door is disclosed, including:Door body, door handle, the first synchronization
Wheel, the second synchronizing wheel, Timing Belt, magnetic piece and iron block.Door handle is in door body, and relative door body is rotatable.First is synchronous
On door handle, the second synchronous relative first synchronizing wheel is arranged wheel fixed cover.First synchronizing wheel and the second synchronizing wheel are by same
Step V belt translation.Magnetic piece is fixedly connected with Timing Belt, iron block towards magnetic piece arrange, toothed belt transmission with drive magnetic piece to away from or lean on
Nearly iron block movement.The door of above-mentioned technical proposal design, only needs user to be turned the handle with handss, the first synchronizing wheel, the second synchronization
Wheel and Timing Belt coordinate transmission, and then drive the magnetic piece that mutually fixes with Timing Belt to moving away from iron block, when magnetic piece sticking iron block
Magnetic attraction weak when iron block is allowd and base is mutually disengaged, door body also will depart from from base.Relative to conventional door, make
User needs to use and holds tight door handle, then firmly pulls out door under the sticking of base in very short time, will be greatly laborsaving.
Moreover, the patent No.:201420389784.7, a kind of door is disclosed, including doorframe and is hinged on doorframe
Door body, arranges the groove of restricted door movement, is provided with rubber layer, is provided with the groove on the groove on the doorframe
Three the first Magnet, corresponding three the first magnet positions three Magnet contrary to magnetropism in the door body, before the doorframe
End is provided with the second Magnet, the second Magnet with the Magnet magnetic being arranged in door body conversely, be provided with a steel plate in the door body,
The structure of the door of above-mentioned technical proposal design, door body are absorbed by rubber layer with the shock kinetic energy of doorframe, the door for effectively avoiding
With the rigid collision of doorframe, while also reduce noise pollution, in addition, the interaction of the contrary Magnet of two magnetic, can make
Door is attracted on doorframe, and overall structure is simple, easy to operate, low production cost.
It can be seen from the prior art that existing door, starts with from structure and is improved and innovation, for each part
Connection, setting are improved and innovation, are allowed to that there is more smooth rotating mechanism, to reach more preferable using effect, but existing
Some doors can find in actual application, still some not fully up to expectations where, the needs of locking of such as existing door make
Door could be locked by rotation of the user by key, that is, need the additional act of user, but in many cases, user
After shutting the door conveniently, the operation that further locks but is have forgotten, this provides convenience to lawless person, is absolutely unsafe, and
In lock structure on existing door, dead bolt is list structure, and the dead bolt on its finite stiffness, and existing design door is distributed with
Limit, it is impossible to which the periphery for door is realized covering to greatest extent, and corresponding to this, dead bolt is for the sealed effect between door body and doorframe
Fruit will seem not enough, and corresponding safety just becomes less high.
Content of the invention
For above-mentioned technical problem, the technical problem to be solved is to provide one kind and is changed based on existing door
Enter, introduce the electric control lock structure of wide cut dead bolt, and with reference to designed intelligent trigger system and device, the motor based on specific design
Drive circuit, is controlled for each expansion link motor, is automatically obtained the intelligent filter based on wide cut dead bolt that locks and triggers
Lock-fit-type door.
The present invention is employed the following technical solutions to solve above-mentioned technical problem:The present invention devises a kind of based on wide cut lock
The intelligent filter triggering lock-fit-type door of tongue, including door body and corresponding doorframe;On one side and doorframe of door body
Corresponding one side is flexibly connected, and door body is rotated with the articulated positions as axle;Also include three expansion link motors, three
Root dead bolt and control module, and be connected with control module respectively power module, acceleration transducer, distance measuring sensor,
Two solution lock control devices, three motor-drive circuits;Each expansion link motor is corresponded respectively through each Motor drive electricity
Road is connected with control module;Power module is respectively acceleration transducer, distance measuring sensor, each unblock through control module
Control device is powered, meanwhile, power module is after control module, flexible for each respectively through each motor-drive circuit
Bar motor is powered;Wherein, two solution lock control devices are separately positioned on the positive and negative of a body;Acceleration transducer sets
Put on door body;Distance measuring sensor be arranged on a body towards doorframe one side upper, close to the side phase for being flexibly connected doorframe
To another lateral location on, for measuring the ultimate range between door body and doorframe;Each motor-drive circuit includes
One NPN type triode Q1, the second NPN type triode Q2, the 3rd PNP type triode Q3, the 4th PNP type triode Q4, the first electricity
Resistance R1, second resistance R2,3rd resistor R3 and the 4th resistance R4;Wherein, one end link control module of first resistor R1 is being just
Level feeder ear, the other end of first resistor R1 connect the colelctor electrode of the first NPN type triode Q1, the second NPN type triode respectively
The colelctor electrode of Q2;The emitter stage of the emitter stage of the first NPN type triode Q1 and the second NPN type triode Q2 is connected to corresponding
On the two ends of expansion link motor, meanwhile, the emitter stage of the emitter stage of the first NPN type triode Q1 and the 3rd PNP type triode Q3
It is connected, the emitter stage of the second NPN type triode Q2 is connected with the emitter stage of the 4th PNP type triode Q4;3rd positive-negative-positive three
The colelctor electrode of pole pipe Q3 is connected with the colelctor electrode of the 4th PNP type triode Q4, and is grounded;The base of the first NPN type triode Q1
Pole is connected with the base stage of the 3rd PNP type triode Q3, and is connected with control module through second resistance R2;Second NPN type three
The base stage of pole pipe Q2 is connected with control module through 3rd resistor R3;The base stage of the 4th PNP type triode Q4 is through the 4th resistance R4
It is connected with control module;The working end of each expansion link motor flexible bar corresponds one end fixation company with each dead bolt
Connect, sandwich establishment space in door body, door body perimeter, in addition to being flexibly connected with doorframe is set on its excess-three side respectively
A through hole is put, mezzanine space is connected, the width of each through hole is adapted with a width on body side which is located, doorframe inside edge
Each equal draw-in groove of, width corresponding with each lead to the hole site is respectively provided with, each expansion link motor is distinguished with corresponding dead bolt
It is fixedly installed in mezzanine space, the position of each dead bolt is corresponding with the position of each through hole respectively, and above each dead bolt
The width of width and through hole to corresponding through hole one end is adapted, and each dead bolt enters under the control of each expansion link motor respectively
Go out the through hole of correspondence position, and realized by the draw-in groove of each correspondence position sealed between door body and doorframe.
As a preferred technical solution of the present invention:The acceleration transducer is arranged on a body and activity connects
Connect on the relative another side in side of doorframe.
As a preferred technical solution of the present invention:The motor of the expansion link motor is brushless electric machine.
As a preferred technical solution of the present invention:The control module and each motor-drive circuit described are arranged on
In the mezzanine space of the door body.
As a preferred technical solution of the present invention:The control module is single-chip microcomputer.
As a preferred technical solution of the present invention:The power module is external power supply.
A kind of intelligent filter triggering lock-fit-type door based on wide cut dead bolt of the present invention adopts above technical scheme and shows
There is technology to compare, with following technique effect:
(1) the intelligent filter triggering lock-fit-type door based on wide cut dead bolt of present invention design, based on existing design door
It is improved on basis, introduces the electric control lock structure of wide cut dead bolt, in conjunction with designed intelligent trigger system and device, can be certainly
Dynamic realization is locked, and wherein, is judged for door body by designed acceleration transducer and distance measuring sensor Intelligent Measurement
Action of closing the door, be then based on this judgement, triggering passes through for the control of each expansion link motor in designed electric control lock structure
The movement of each dead bolt, realizes sealed between door body and doorframe, and whole operation process is without the need for the extra excessive action of operator, institute
Design structure Intelligent Measurement judges the action of closing the door of operator, and intelligence is automatically obtained for door body and doorframe on this basis
Between sealed operation, realize automatic locking, substantially increase actually used in safety;And the specification for each dead bolt
Size, design are adapted with the width on the side of a body which is located, and can be greatly improved the hardness of lock bolt structure, and then be carried significantly
The high designed intelligent filter based on wide cut dead bolt triggers the safety of lock-fit-type door practical application;Moreover, for stretching
Contracting bar motor, specific design motor-drive circuit, substantially increases stability of the expansion link motor in practical work process;
(2) in the intelligent filter triggering lock-fit-type door based on wide cut dead bolt of present invention design, for acceleration transducer
Position arrange, further design is located on door body and is flexibly connected on the relative another side in side of doorframe so that plus
Maximum rotation path of the velocity sensor with door body, with more efficient, sensitive accuracy of detection, more quickly can catch
The action of closing the door of operator is grasped, and then causes the designed intelligent filter triggering lock-fit-type door based on wide cut dead bolt, can
Realize the more efficient course of work;
(3) in the intelligent filter triggering lock-fit-type door based on wide cut dead bolt of present invention design, for expansion link motor
Motor, is further designed with brushless electric machine so that the designed intelligent filter triggering lock-fit-type based on wide cut dead bolt of the present invention
Door can realize quiet work in practical work process, both ensure that the designed intelligent filter based on wide cut dead bolt is triggered
The automatic locking function that lock-fit-type door has, can guarantee that its course of work is not impacted to surrounding again, embodies and set
Human oriented design during meter;
(4) in the intelligent filter triggering lock-fit-type door based on wide cut dead bolt of present invention design, for control module and respectively
The position of individual motor-drive circuit is arranged, and further design is located in the mezzanine space of the door body, can be prevented effectively from control
Molding block and each motor-drive circuit are destroyed by external environment condition;And for control module, further it is designed with list
Piece machine, on the one hand can be applied to extension demand of the later stage for the intelligent filter triggering lock-fit-type door based on wide cut dead bolt, separately
On the one hand, succinct control architecture mode can be easy to the maintenance in later stage;Moreover, for power module, further design
Using external power supply, designed intelligent filter triggering lock-fit-type door power taking based on wide cut dead bolt, electricity consumption is can effectively ensure that
Stability.
Description of the drawings
Fig. 1 is the side structure schematic diagram that intelligent filter of the present invention design based on wide cut dead bolt triggers lock-fit-type door;
Fig. 2 is the signal of motor-drive circuit in intelligent filter triggering lock-fit-type door of the present invention design based on wide cut dead bolt
Figure.
Wherein, a 1. body, 2. doorframe, 3. dead bolt, 4. control module, 5. power module, 6. acceleration transducer, 7. surveys
Away from sensor, lock control device is 8. solved, 9. expansion link motor, 10. motor-drive circuit.
Specific embodiment
It is described in further detail with reference to specific embodiment of the Figure of description for the present invention.
As shown in figure 1, a kind of intelligent filter triggering lock-fit-type door based on wide cut dead bolt of present invention design, including door sheet
Body 1 and corresponding doorframe 2;Corresponding with doorframe 2 one side in one side flexible connection of door body 1, door body 1 is with this
Articulated positions are rotated for axle;Also include three expansion link motors, 9, three dead bolts 3 and control module 4, and difference
The power module 5 that is connected with control module 4, acceleration transducer 6,7, two solution lock control devices 8, three of distance measuring sensor
Motor-drive circuit 10;Each expansion link motor 9 is corresponded respectively and is connected with control module 4 through each motor-drive circuit 10
Connect;Power module 5 is respectively acceleration transducer 6, distance measuring sensor 7, each solution lock control device 8 through control module 4 and enters
Row power supply, meanwhile, power module 5, after control module 4, is each expansion link motor respectively through each motor-drive circuit 10
9 are powered;Wherein, two solution lock control devices 8 are separately positioned on the positive and negative of a body 1;Acceleration transducer 6 is arranged
On door body 1;Distance measuring sensor 7 be arranged on a body 1 towards the one side of doorframe 2 upper, close to the side for being flexibly connected doorframe 2
In relative another lateral location, for measuring the ultimate range between door body 1 and doorframe 2;As shown in Fig. 2 each motor drives
Galvanic electricity road 10 includes the first NPN type triode Q1, the second NPN type triode Q2, the 3rd PNP type triode Q3, the 4th positive-negative-positive
Audion Q4, first resistor R1, second resistance R2,3rd resistor R3 and the 4th resistance R4;Wherein, one end of first resistor R1 connects
Connect the positive level feeder ear of control module 4, the other end of first resistor R1 connect respectively the colelctor electrode of the first NPN type triode Q1,
The colelctor electrode of the second NPN type triode Q2;The emitter stage of the first NPN type triode Q1 and the transmitting of the second NPN type triode Q2
Pole is connected on the two ends of corresponding expansion link motor 9, meanwhile, the emitter stage of the first NPN type triode Q1 and the 3rd positive-negative-positive
The emitter stage of audion Q3 is connected, the emitter stage phase of the emitter stage of the second NPN type triode Q2 and the 4th PNP type triode Q4
Connection;The colelctor electrode of the 3rd PNP type triode Q3 is connected with the colelctor electrode of the 4th PNP type triode Q4, and is grounded;First
The base stage of NPN type triode Q1 is connected with the base stage of the 3rd PNP type triode Q3, and through second resistance R2 and control module 4
It is connected;The base stage of the second NPN type triode Q2 is connected with control module 4 through 3rd resistor R3;4th PNP type triode Q4
Base stage be connected with control module 4 through the 4th resistance R4;The working end of each 9 expansion link of expansion link motor correspond with each
One end of root dead bolt 3 is fixedly connected, sandwich establishment space in door body 1,1 periphery of door body, except be flexibly connected with doorframe 2 one
Outside side, a through hole on its excess-three side, is respectively provided with, connects mezzanine space, the width of each through hole and 1 side of a body which is located
Width is adapted, and 2 inside edge of doorframe is respectively provided with each equal draw-in groove of, width corresponding with each lead to the hole site, each
Expansion link motor 9 is respectively fixedly disposed in mezzanine space with corresponding dead bolt 3, the position of each dead bolt 3 respectively with each through hole
Position corresponding, and the width of width and the through hole on each dead bolt 3 towards corresponding through hole one end is adapted, each dead bolt 3
Pass in and out the through hole of correspondence position respectively under the control of each expansion link motor 9, and realized by the draw-in groove of each correspondence position
Sealed between door body 1 and doorframe 2.The intelligent filter triggering lock-fit-type door based on wide cut dead bolt of above-mentioned technical proposal design,
Based on being improved on existing design door basis, the electric control lock structure of wide cut dead bolt is introduced, in conjunction with designed intelligence
Triggering system and device, can be automatically obtained and lock, wherein, by 7 intelligence of designed acceleration transducer 6 and distance measuring sensor
The action of closing the door that detection is judged for door body 1, is then based on this judgement, triggering in designed electric control lock structure each
The control of expansion link motor 9, by the movement of each dead bolt 3, realizes sealed between door body 1 and doorframe 2, whole operation process
Without the need for the extra excessive action of operator, designed structure intelligent detection judges the action of closing the door of operator, and intelligence on this basis
Can be automatically obtained for the sealed operation between door body 1 and doorframe 2, realize automatic locking, substantially increase actually used in
Safety;And the specification for each dead bolt 3, designs, Neng Gou great adaptable with the width on the side of a body 1 which is located
Width improves the hardness of 3 structure of dead bolt, and then substantially increases the designed intelligent filter triggering lock-fit-type door based on wide cut dead bolt
The safety of practical application;Moreover, for expansion link motor 7, specific design motor-drive circuit 8 is substantially increased
Stability of the expansion link motor 7 in practical work process.
On the basis of the intelligent filter triggering lock-fit-type gate technique scheme based on above-mentioned design based on wide cut dead bolt, this
Bright also further devise following optimal technical scheme:Position for acceleration transducer 6 is arranged, and further design is located at door
On body 1 on another side relative with the side for being flexibly connected doorframe 2 so that acceleration transducer 6 is with a body 1
Maximum rotation path, with more efficient, sensitive accuracy of detection, can more quickly capture the action of closing the door of operator,
And then the designed intelligent filter triggering lock-fit-type door based on wide cut dead bolt is caused, can realize more efficiently worked
Journey;And the motor for expansion link motor 9, is further designed with brushless electric machine so that the present invention is designed to be based on wide cut
The intelligent filter triggering lock-fit-type door of dead bolt in practical work process can be realized quiet work, both ensure that designed base
In the automatic locking function that the intelligent filter triggering lock-fit-type door of wide cut dead bolt has, can guarantee that its course of work not to week again
Collarette border impacts, and embodies the human oriented design in design process;Further, for control module 4 and each Motor drive
The position of circuit 10 is arranged, and further design is located in the mezzanine space of the door body 1, can be prevented effectively from control module 4
Destroyed by external environment condition with each motor-drive circuit 10;And for control module 4, further it is designed with monolithic
Machine, on the one hand can be applied to extension demand of the later stage for the intelligent filter triggering lock-fit-type door based on wide cut dead bolt, another
Aspect, succinct control architecture mode can be easy to the maintenance in later stage;Moreover, for power module 5, further design is adopted
With external power supply, can effectively ensure that designed intelligent filter triggering lock-fit-type door power taking based on wide cut dead bolt, electricity consumption steady
Qualitative.
Intelligent filter of the present invention design based on wide cut dead bolt triggers lock-fit-type door in the middle of actual application, including door
Body 1 and corresponding doorframe 2;Corresponding with doorframe 2 one side in one side flexible connection of door body 1, door body 1 with
The articulated positions are rotated for axle;Also include three expansion link motors 9, three dead bolts 3 and single-chip microcomputers, and respectively with
External power supply that single-chip microcomputer is connected, acceleration transducer 6,7, two solution 8, three motors of lock control device of distance measuring sensor drive
Galvanic electricity road 10;Each expansion link motor 9 is corresponded respectively and is connected with single-chip microcomputer through each motor-drive circuit 10;External electricity
Source is respectively acceleration transducer 6, distance measuring sensor 7, each solution lock control device 8 through single-chip microcomputer and is powered, meanwhile, outward
Power supply is connect after single-chip microcomputer, is powered for each expansion link motor 9 respectively through each motor-drive circuit 10;Wherein, respectively
The motor of individual expansion link motor 9 is brushless electric machine;Two solution lock control devices 8 are separately positioned on the positive and negative of a body 1;Plus
Velocity sensor 6 is arranged on a body 1 on another side relative with the side for being flexibly connected doorframe 2;Distance measuring sensor 7
A body 1 is arranged on towards in 2 one side of doorframe, close in another lateral location relative with the side for being flexibly connected doorframe 2, is used
Ultimate range between measurement door body 1 and doorframe 2;Each motor-drive circuit 10 include the first NPN type triode Q1,
Two NPN type triodes Q2, the 3rd PNP type triode Q3, the 4th PNP type triode Q4, first resistor R1, second resistance R2,
Three resistance R3 and the 4th resistance R4;Wherein, one end of first resistor R1 connects the positive level feeder ear of single-chip microcomputer, first resistor R1
The other end connects the colelctor electrode of the first NPN type triode Q1, the colelctor electrode of the second NPN type triode Q2 respectively;First NPN type three
The emitter stage of the emitter stage of pole pipe Q1 and the second NPN type triode Q2 is connected on the two ends of corresponding expansion link motor 9, with
When, the emitter stage of the first NPN type triode Q1 is connected with the emitter stage of the 3rd PNP type triode Q3, the second NPN type triode
The emitter stage of Q2 is connected with the emitter stage of the 4th PNP type triode Q4;The colelctor electrode and the 4th of the 3rd PNP type triode Q3
The colelctor electrode of PNP type triode Q4 is connected, and is grounded;The base stage of the first NPN type triode Q1 and the 3rd PNP type triode Q3
Base stage be connected, and be connected with single-chip microcomputer through second resistance R2;The base stage of the second NPN type triode Q2 is through 3rd resistor R3
It is connected with single-chip microcomputer;The base stage of the 4th PNP type triode Q4 is connected with single-chip microcomputer through the 4th resistance R4;Each expansion link electricity
The working end of 9 expansion link of machine is corresponded and is fixedly connected with one end of each dead bolt 3, sandwich establishment space, monolithic in door body 1
Machine and each motor-drive circuit 10 are arranged in the mezzanine space of a body 1;Door 1 periphery of body, except being flexibly connected with doorframe 2
One side outside, be respectively provided with a through hole on its excess-three side, connect mezzanine space, the width of each through hole and a body 1 which is located
The width on side is adapted, and 2 inside edge of doorframe is respectively provided with each equal draw-in groove of, width corresponding with each lead to the hole site,
Each expansion link motor 9 is respectively fixedly disposed in mezzanine space with corresponding dead bolt 3, the position of each dead bolt 3 respectively with each
The position of through hole is corresponding, and the width of the width and through hole on each dead bolt 3 towards corresponding through hole one end is adapted, each lock
Tongue 3 passes in and out the through hole of correspondence position respectively under the control of each expansion link motor 9, and by the draw-in groove reality of each correspondence position
Sealed between existing door body 1 and doorframe 2.In the middle of actual application, 6 real time operation of acceleration transducer, and by real-time detection
Data are uploaded in the middle of single-chip microcomputer, and single-chip microcomputer is analyzed judgement for the real-time detector data for coming from acceleration transducer 6,
If analysis is when judging that the real-time detection detection data shows that a body 1 is rotated away from 2 direction of doorframe, single-chip microcomputer do not do into
Single stepping;If analysis judge the real-time detection detection data show a body 1 towards 2 direction of doorframe rotate when, single-chip microcomputer
Start the distance measuring sensor 7 that is attached thereto to start working, and real-time detector data is uploaded in the middle of single-chip microcomputer, then single-chip microcomputer is again
Judgement is analyzed for the real-time detector data for coming from distance measuring sensor 7, if analysis judges the real-time detection detection data
Be 0, then single-chip microcomputer do not do and further operate, if analysis judge the real-time detector data for 0, single-chip microcomputer immediately respectively through
Motor-drive circuit 10 that each is attached thereto, to each 9 transmitting control commands of expansion link motor, control each expansion link motor
9 start working, and each dead bolt 3 stretches out the through hole of correspondence position respectively under the control of each expansion link motor 9, and inserts respectively
In each draw-in groove corresponding of 2 inside edge of doorframe, the locked state that is automatically obtained between a body 1 and doorframe 2, due to each through hole
Width is adapted with the width on 1 side of a body which is located, and the width and through hole on each dead bolt 3 towards corresponding through hole one end
Width is adapted, and therefore, adopts the structure each dead bolt 3 of design, with higher hardness, and then is passing through each dead bolt
3 realize between door body 1 and doorframe 2 during locked state, can greatly improve the designed intelligence filter based on wide cut dead bolt
Ripple triggers the safety of lock-fit-type door;Therefore, the intelligent filter triggering lock-fit-type door based on wide cut dead bolt of present invention design exists
In the middle of actual application, by the above-mentioned course of work, you can realize automatic locking operation, correspondingly, when need open door
During body 1, operator only need to solve lock control devices 8 by two be separately positioned on 1 positive and negative of a body, send out to single-chip microcomputer
Send control command, you can realize unlocking, due to during this, door body 1 is rotated away from the direction of doorframe 2,
Therefore will not trigger above-mentioned be automatically brought into operation process, in practical application, for solution lock control device 8, can specifically using fingerprint knowledge
Other module is realized, can further improve the designed intelligent filter based on wide cut dead bolt of the present invention and trigger lock-fit-type door
Safety.
It is explained in detail for embodiments of the present invention above in conjunction with Figure of description, but the present invention is not limited to
Above-mentioned embodiment, in the ken that those of ordinary skill in the art possess, can be with without departing from present inventive concept
On the premise of make a variety of changes.