Sliding plug door system

Abstract

The invention belongs to the technical field of vehicle equipment, and relates to a sliding plug door system, a main body structure comprises a driving mechanism, a door leaf connected with the driving mechanism, and a plurality of balance wheel mechanisms, an auxiliary locking mechanism, a lower swing arm mechanism and a limiting pin which are connected with the door leaf, an upper wheel and a lower wheel are adopted to make contact with the upper ends and the lower ends of grooves in the two sides of a door leaf to stabilize and balance the door leaf, a lower swing arm mechanism adopts a three-guide-wheel mode, the two guide wheels are arranged on the inner side and the outer side of a rail respectively, and the other guide wheel makes contact with the door leaf to be matched with opening and closing actions. The rolling wheel assembly falls into a groove in the tail of the sliding groove to be locked, at the moment, the rotating center of the rolling wheel assembly is lower than the horizontal line where the rotating center of the rotating frame is located, and the locking state is locked through holding force provided by the torsional spring; according to the scheme, locking, unlocking and plug-pull actions are achieved through a single driving motor, and the applicability of the vehicle door is improved.

Description

Technical field:

[0001] The present invention belongs to the technical field of vehicle equipment, and specifically relates to a plug-and-slide door system, which is applicable to various types of rail vehicles by reducing redundant components and simplifying the main structure. Background technology:

[0002] As a highly efficient door system, plug-in doors are widely used in rail transit vehicles and some high-end passenger cars. Their complex "plug-in" motion path solves the problems of traditional doors, such as large space occupation and insufficient sealing, significantly improving vehicle operating efficiency and passenger comfort. However, existing plug-in doors rely on a mechanical linkage of multiple connecting rods, swing arms, and guide rails, resulting in high component redundancy. Long-term operation can easily lead to movement stagnation or positioning deviation due to wear, increasing maintenance costs.For example, Chinese Patent 202411361218.0 discloses a double-opening plug sliding door system, comprising: a load-bearing drive mechanism, the load-bearing drive mechanism is fixed to the vehicle body, and an end restraint device is rotatably installed on the load-bearing drive mechanism; a pair of door leaves, the two door leaves are movably arranged on the load-bearing drive mechanism, the two door leaves have a first position in which the inner plug is closed and a second position in which they are unfolded apart, and when the door leaves are switched from the second position to the first position, the end restraint device moves to limit the door leaves; a middle restraint lock hook, the middle restraint lock hook is fixed to the vehicle body, and when the door leaves are placed in the first position, the middle restraint lock hook is coupled with the second lock buckle in the middle of the rear stop of the door leaves; a lower swing guide device, the lower swing guide device is fixed to the bottom of the vehicle body, and the lower swing guide device includes The swing arm drive shaft and the stopper, a vertical synchronization rod assembly is connected between the swing arm drive shaft and the carrying drive mechanism. When the door leaf switches from the second position to the first position, the carrying drive mechanism drives the vertical synchronization rod assembly, and then drives the swing arm drive shaft so that the stopper can guide and limit the movement of the lower part of the door leaf. The carrying drive mechanism also includes a frame, a rotary drive rod, a nut assembly, a transmission frame, a crossbeam, and a door carrying frame assembly; the frame is fixed to the vehicle body, the rotary drive rod is rotatably connected to the frame, the nut assembly and the rotary drive rod form a screw-nut pair connection, the transmission frame and the nut assembly and the crossbeam are rotatably connected; the crossbeam is supported by the frame and can move horizontally along the vehicle width on the frame, the door carrying frame assembly can move along the length direction of the crossbeam, and the door leaf is fixed on the door carrying frame assembly ; The nut assembly, transmission frame and crossbeam constitute a crank slider mechanism; when approaching the first position, the rotating drive rod drives the nut assembly to rotate, realizing the driving of the crossbeam in the horizontal direction of the vehicle width and the dead point locking; when the door leaf is inserted into place, the end restraint device realizes the constraint of the two ends of the crossbeam; the load-bearing drive mechanism also includes an upper slide, which is arranged on the frame, and the upper slide includes a straight section, a curved section and a groove section. The straight section, the curved section and the groove section are connected by an arc transition. The groove section is perpendicular to the straight section, and the groove section is used to form an X-direction constraint on the door leaf in the closed state; a roller is fixed to the top of the door frame assembly, and the roller is clamped in the upper slide to control the movement trajectory of the door leaf. The vertical synchronization rod assembly includes a synchronization rod, an upper rotating arm and a connecting rod. The upper part of the synchronization rod It is rotatably connected to the vehicle body, the upper rotating arm is fixedly connected to the upper part of the synchronization rod, and the two ends of the connecting rod are respectively rotatably connected with the upper rotating arm and the crossbeam assembly. The lower part of the synchronization rod is fixedly connected to the swing arm drive shaft, and the front stop of the door leaf is provided with a finger guard strip; the upper, lower and rear stops of the door leaf are provided with continuous peripheral sealing strips, and the peripheral sealing strips include a figure-eight lip; when the door leaf is inserted into place, the finger guard strips of the left and right door leaves contact and squeeze each other, and the figure-eight lip of the peripheral sealing strip contacts and squeezes the sealing surface on the vehicle body; wherein a door sill and a molding are fixed on the vehicle body, and the door sill forms a sealing surface with the outer surface of the molding; it also includes a stop pin fixed to the bottom of the door leaf, and the two door leaves are closed and acted upon by the lower swing guide device, so that the stop pin is coupled with the insert on the door sill to limit the lower part of the front stop of the door leaf.Chinese Patent No. 202421781934.9 discloses a high-speed rail plug door structure, including a plug drive mechanism and a door leaf. The plug drive mechanism includes a mounting frame, two longitudinal guide rods are fixedly installed on the lower side of the mounting frame, and sliding sleeves are slidably installed on the surfaces of the two longitudinal guide rods. A transverse guide rod is fixedly installed between the sliding sleeves on both sides, and a driven sleeve is slidably installed on the surface of the transverse guide rod. A door-carrying crank arm is fixedly installed on the surface of the driven sleeve, and the door leaf is fixedly connected to the front of the door-carrying crank arm; a transmission screw is rotatably installed inside the mounting frame, and a servo motor is fixedly installed inside the mounting frame, and the servo motor drives the transmission The screw rod rotates, and the surface of the transmission screw rod is threadedly connected with a transmission nut, and a transmission plate is rotatably installed on the lower side of the transmission nut. The lower side of the transmission plate is rotatably connected to the surface of the driven sleeve. A groove guide rail is fixedly installed inside the mounting frame, and a roller is rotatably installed on the upper surface of the door-carrying crank arm. The roller rolls along the inner wall of the groove guide rail. The surfaces of the sliding sleeves on both sides are fixedly installed with hanging rack plates, and the two ends of the transverse guide rod are respectively fixedly connected to the hanging rack plates on both sides. The mounting frame is fixedly installed inside the car, and a door frame is embedded in the surface of the car. The door-carrying crank arm can extend from the door frame hole to the outside of the car, and the door leaf is closed in the door frame by the plug cover of the door-carrying crank arm.Chinese Patent No. 202410137880.0 discloses an electrically controlled pneumatic plug sliding door, comprising a door mounting component, a door panel assembly, a vertical shaft assembly, and a control circuit. The door mounting component comprises an end frame and a structural crossbeam, at least two structural crossbeams are installed between the two end frames, two left and right linear load-bearing rails are symmetrically arranged at both ends of the bottom of the door mounting component, and two left and right linear retaining slides are symmetrically arranged on the upper part of the door mounting component, and the linear retaining slides are matched with the linear load-bearing rails; an arc-shaped guide groove is arranged on the top of the door mounting component; a door panel drive component is configured in the door mounting component, and the door panel drive component comprises two symmetrically arranged walking wheel mechanisms, a column guide rail mechanism, a ring-shaped synchronous belt, and a rodless cylinder mechanism ; Two traveling wheel mechanisms are respectively arranged at the two ends of the door panel driving component, and two column guide rail mechanisms are fixed in parallel between the two traveling wheel mechanisms; the door panel driving component is installed in the linear load-bearing track through the traveling wheel mechanism; the column guide rail mechanism includes a column linear guide rail and a sleeve type slider; the sleeve type slider in the first column guide rail mechanism is connected with the piston slider in the rodless cylinder mechanism through a hinge plate, and the sleeve type slider is also fixedly connected to one transmission side of the ring type synchronous belt, and the sleeve type slider in the second column guide rail is fixedly connected to the other transmission side of the ring type synchronous belt; two left and right swing arm mounting plates, a left swing arm and a right swing arm are symmetrically arranged on the upper part of the door mounting component, and the roots of the left swing arm and the right swing arm are respectively connected to the left and right swing arm mounting plates The left swing arm is hinged, the head of the left swing arm is hinged to one end of the cylinder body in the rodless cylinder mechanism, and the other end of the cylinder body is hinged to the head of the right swing arm; two push-pull guide wheels are symmetrically arranged on the upper part of the door panel drive component, the left push-pull guide wheel is slidably connected to the left straight line to maintain the slide, and the right push-pull guide wheel is slidably connected to the right straight line to maintain the slide; a Sierra control roller is provided on the sleeve-type slider in the first column guide rail mechanism, and the Sierra control roller is slidably connected to the arc guide groove; the door panel assembly includes a left carrying door frame, a right carrying door frame, a left door panel, and a right door panel. The right carrying door frame is installed on the sleeve-type slider in the first column guide rail mechanism, the top of the right door panel is installed together with the right carrying door frame, and the left carrying door frame is installed on the sleeve-type slider in the second column guide rail mechanism. The top of the left door panel is installed together with the left door frame on the block; the vertical shaft assembly includes a left vertical shaft and a right vertical shaft, the upper part of the left vertical shaft is hinged to the bottom of the door panel driving component through a push-pull rod, the lower part of the left vertical shaft is slidably connected to the lower part of the left door panel through a lower rotating arm, the upper part of the right vertical shaft is hinged to the bottom of the door panel driving component through another push-pull rod, and the lower part of the right vertical shaft is slidably connected to the lower part of the right door panel through another lower rotating arm; the door mounting component is fixed to the bus body, the vertical shaft assembly is installed to the bus body, and a left connecting rod and a right connecting rod are provided on the door panel driving component, the left connecting rod head is hinged to the middle part of the left swing arm, the left connecting rod tail is hinged to the left part of the door panel driving component, the right connecting rod head is hinged to the middle part of the right swing arm, and the right connecting rod tail is hinged to the right part of the door panel driving component.Therefore, there is an urgent need to develop and design a new sliding door system that integrates lightweight structure, intelligent perception and adaptive control to meet the needs of rail transit equipment to develop in the direction of efficiency, greenness and intelligence. Summary of the invention:

[0003] The purpose of the present invention is to overcome the shortcomings of the prior art and to develop and design a sliding door system with a simpler structure, convenient installation and maintenance, so as to achieve smooth opening and closing of the door and safe locking and unlocking.

[0004] In order to achieve the above-mentioned object, the main structure of the sliding door system of the present invention includes a driving mechanism and a door leaf connected thereto, as well as a balancing wheel mechanism, an auxiliary locking mechanism, a lower swing arm mechanism and a limit pin connected to the door leaf;

[0005] The main structure of the driving mechanism includes a bearing cover plate and end bearing mounting frames, a middle bearing mounting frame and a guide rail arranged thereon, as well as plug guide posts arranged on the end bearing mounting frames and the middle bearing mounting frame, an end plug hanger arranged on the end plug guide posts, a middle plug hanger arranged on the middle plug guide posts, a sliding guide post arranged between the end plug hanger and the middle plug hanger, a lead screw passing through the middle plug hanger, and a door leaf bearing assembly arranged on the sliding guide post.

[0006] The number of balancing wheel mechanisms is at least 4, with an upper and lower wheel structure, which are installed on the body on both sides of the middle part of the door leaf. When the sliding door is opened and closed, the two balancing wheels slide against the grooves of the door leaf to ensure that the door leaf does not deviate up and down or outward;

[0007] The number of auxiliary locking mechanisms is at least 2, which are pneumatic and connected to the side of the door leaf. When ventilated, the external cylinder simultaneously presses the door leaf to perform auxiliary locking.

[0008] The lower swing arm mechanism is installed on the lower part of the door leaf on both sides of the vehicle body. The upper sliding wheel is upward and cooperates with the track on the door leaf, and the lower sliding wheel is downward and in contact with the door leaf. When the sliding door is opened and closed, the sliding wheel guides the door leaf to perform a composite movement of translation and rotation, ensuring that the door body moves along the predetermined track to prevent deviation or jamming.

[0009] The limit pin is set at the middle bottom position of the door leaf and cooperates with the threshold. When the door leaf is closed, the limit pin extends and is stuck in the threshold groove to prevent the sliding door from opening due to external force.

[0010] The main structure of the middle Sierra hanger involved in the present invention includes a driving motor and a rotating frame and a driving gear connected thereto, and a roller assembly and a torsion spring arranged on the rotating frame.

[0011] The middle load-bearing mounting frame of the present invention is provided with an L-shaped sliding groove;

[0012] The two ends of the lead screw are fixed on the end plug hanger, and two nuts and a follower pulley are set in the middle, and the nuts are located on both sides of the follower pulley;

[0013] The middle Sierra hanger is connected to the lead screw through a synchronous belt;

[0014] The door leaf bearing assembly is connected to the door leaf;

[0015] The driving gear is meshed with the driven gear, and the driven gear is connected to the driving synchronous pulley through a pin and then installed on the pin shaft;

[0016] The roller assembly is embedded in the slide groove;

[0017] The driving synchronous pulley is connected to the driven pulley through a synchronous belt;

[0018] When the Sierra door system disclosed by the present invention is in operation: the driving motor drives the lead screw to rotate, the end Sierra hanger and the middle Sierra hanger slide along the Sierra guide column, and the roller assembly slides along the slide groove. After being inserted into place, the roller assembly falls into the groove at the tail of the slide groove under the drive of the rotating frame to achieve locking. At this time, the rotation center of the roller assembly is lower than the horizontal line where the rotation center of the rotating frame is located, and the holding force provided by the torsion spring locks the locked state.

[0019] Compared with the prior art, the present invention comprises a driving mechanism and a door leaf connected thereto, as well as a balancing wheel mechanism, an auxiliary locking mechanism, a lower swing arm mechanism and a limit pin connected to the door leaf. Several balancing wheel mechanisms are respectively arranged at the upper middle part and the lower middle part on both sides of the door leaf, and adopt the form of an upper and lower wheel, which contacts the upper and lower ends of the grooves inside the two sides of the door leaf to stabilize and balance the door leaf. The lower swing arm mechanism adopts the form of three guide wheels, two guide wheels are respectively arranged at the inner and outer sides of the track, and the other guide wheel contacts the door leaf to cooperate with the switching action. After the sliding door is inserted into place, the roller assembly falls into the groove at the tail of the slide slot to be locked. At this time, the rotation center of the roller assembly is lower than the horizontal line of the rotation center of the rotating frame, and the holding force provided by the torsion spring locks the locked state. Its structure is simple, and locking, unlocking and sliding actions can be realized by a single drive motor, which provides an optimal technical solution for the rail vehicle door drive system and improves the applicability of the door. Description of the drawings:

[0020] Figure 1 It is a schematic diagram of the main structural principle of the present invention.

[0021] Figure 2 This is a schematic diagram of the main structural principle of the driving mechanism involved in the present invention.

[0022] Figure 3 This is a bottom view of the main structure of the driving mechanism involved in the present invention.

[0023] Figure 4 This is a schematic diagram of the main structural principle of the middle Sierra hanger assembly involved in the present invention.

[0024] Figure 5 The figure is a schematic diagram of the main structural principle of the balance wheel involved in the present invention.

[0025] Figure 6 This is a schematic diagram of the main structural principle of the lower swing arm involved in the present invention.

[0026] Figure 7 This is a cross-sectional view of the plugged-in locked state according to the present invention.

[0027] Figure 8 This is a cross-sectional view of the plug-out unlocked state according to the present invention.

[0028] Figure 9 It is a schematic diagram of the locking principle involved in the present invention. Specific implementation method:

[0029] The technical solution of the present invention is further described below with reference to the accompanying drawings and specific embodiments.

[0030] Example 1:

[0031] The main structure of the plug door system involved in this embodiment is as follows Figure 1 As shown, it includes a drive mechanism 1, a door leaf 2, a balancing wheel mechanism 3, an auxiliary locking mechanism 4, a lower swing arm mechanism 5 and a limit pin 6; the drive mechanism 1 is connected to the door leaf 2, and the outer side of the door leaf 2 is connected to several balancing wheel mechanisms 3, auxiliary locking mechanisms 4 and lower swing arm mechanisms 5, and the bottom is connected to the limit pin 6;

[0032] Among them, the main structure of the driving mechanism 1 is as follows Figure 2-3As shown, it includes a bearing cover plate 11, an end bearing mounting frame 12, a middle bearing mounting frame 13, a guide rail 14, a Sierra guide column 15, a slide groove 16, an end Sierra hanger 17, a middle Sierra hanger 18, a sliding guide column 19, a screw 20, a door leaf bearing assembly 21, a synchronous belt 22, a nut 23 and a follower pulley 24; the bearing cover plate 11 is provided with an end bearing mounting frame 12 at both ends, a middle bearing mounting frame 13 is provided in the middle, two guide rails 14 are provided on the lower edge, and Sierra guide columns 15 are provided on the end bearing mounting frame 12 and the middle bearing mounting frame 13. The two end bearing mounting frames 12 are mirror-symmetrical, and an L-shaped slide groove 16 is provided on the middle bearing mounting frame 13. The two guide rails 14 are closed. The guide post 15 is mirror-symmetrical with the middle bearing mounting frame 13; the end guide post 15 is provided with an end guide bracket 17, the middle guide post 15 is provided with a middle guide bracket 18, and a sliding guide post 19 is provided between the end guide bracket 17 and the middle guide bracket 18. The lead screw 20 is passed through the middle guide bracket 18, and the two ends are fixed on the end guide bracket 17. Two door leaf bearing assemblies 21 are also provided on the sliding guide post 19. The middle guide bracket 18 and the lead screw 20 are connected by a synchronous belt 22. The two door leaf bearing assemblies 21 are mirror-symmetrical about the middle guide bracket 18. Two nuts 23 and a driven pulley 24 are provided in the middle of the lead screw 20, and the nut 18 is located on both sides of the driven pulley 24.

[0033] Furthermore, the main structure of the middle Sierra hanger 18 is as follows Figure 4 As shown, it includes a bracket seat 180, a driving motor 181, a rotating frame 182, a driving gear 183, a roller assembly 184, a torsion spring 185, a driven gear 186, a driving synchronous pulley 187, a pin 188 and a pin shaft 189; the bracket seat 180 is provided with a driving motor 181 and a rotating frame 182, the driving motor 181 is connected to the rotating frame 182 and the driving gear 183, one end of the rotating frame 182 is provided with a roller assembly 184, and the other end is embedded with a torsion spring 185, the driving gear 183 is meshed with the driven gear 186, and the driven gear 186 is connected to the driving synchronous pulley 187 through a pin 188 and is installed on the pin shaft 189;

[0034] The roller assembly 184 is embedded in the slide groove 16;

[0035] The driving synchronous pulley 187 is connected to the driven pulley 24 through the synchronous belt 22;

[0036] The main structure of the balance wheel mechanism 3 is as follows Figure 5 As shown, it includes a mounting base 31 and a balancing wheel 32; two balancing wheels 32 are provided on the mounting base 31 of the frame structure provided on the vehicle body, and the balancing wheels 32 cooperate with the grooves 210 provided on the door leaf 2;

[0037] The main structure of the lower swing arm mechanism 5 is as follows Figure 6 As shown, it includes a fixed seat 51, a swing arm 52, a sliding wheel 53 and a rotating shaft 54; the swing arm 52 is provided on the fixed seat 51 arranged on the vehicle body, and the upper surface of the end of the swing arm 52 is provided with two sliding wheels 53 with wheels facing upwards, and the lower surface is provided with a sliding wheel 53 with wheels facing downwards. The swing arm 52 is set on the fixed seat 51 through the rotating shaft 54, and the upper sliding wheel 53 cooperates with the track 220 set on the door leaf 2, and the lower sliding wheel 53 is in contact with the door leaf 2.

[0038] The plug-in locking state of the plug-in sliding door system involved in this embodiment is as follows Figure 7 As shown:

[0039] The driving motor 181 rotates counterclockwise, and drives the lead screw 20 to rotate through the driving gear 183, the driven gear 186, the driving pulley 187 and the driven pulley 24. The lead screw 20 drives the two sets of door leaf bearing assemblies 21 to slide relative to each other through the nut 23. At the same time, the end plug-in hanger 17 and the middle plug-in hanger 18 slide along the plug-in guide column 15, and the roller assembly 184 slides along the slide groove 16. After being inserted into place, the roller assembly 184 falls into the groove at the tail end of the slide groove 16 under the drive of the rotating frame 182 to be locked. The torsion spring 185 provides the locking retention force to achieve plug-in locking.

[0040] Plug out the unlocked state Figure 8 As shown:

[0041] The driving motor 181 rotates clockwise, driving the roller assembly 184 to rotate clockwise through the rotating frame 182. The roller assembly 184 slides out of the groove at the tail end of the slide 16 to achieve the unlocking of the plug. The driving motor 181 continues to rotate clockwise, driving the screw 20 to rotate through the driving gear 183, the driven gear 186, the driving pulley 187 and the driven pulley 24. The screw 20 drives the two sets of door leaf bearing assemblies 25 to slide relative to each other through the nut 23. At the same time, the roller assembly 184 slides along the slide 16 to achieve the door opening action.

[0042] Locking principle Figure 9 As shown:

[0043] The rotation center of the roller assembly 184 is lower than the horizontal line where the rotation center of the rotating frame 182 is located, and the torsion spring 185 provides a holding force to maintain it in a locked state.

Claims

1. A sliding plug door system, characterized in that: The main structure includes a driving mechanism and a door leaf connected thereto, as well as a balancing wheel mechanism connected to the door leaf. The number of balancing wheel mechanisms is at least 4, which adopt an upper and lower wheel structure and are arranged on the vehicle body on both sides of the middle of the door leaf.

2. The plug door system according to claim 1, characterized in that. The main structure also includes an auxiliary locking mechanism connected to the door leaf.

3. The plug door system according to claim 2, characterized in that: The number of the auxiliary locking mechanisms is at least 2 and they are connected to the side edges of the door leaf.

4. The plug door system according to claim 3, characterized in that: The main structure also includes a lower swing arm mechanism connected to the door leaf.

5. The plug door system according to claim 3, characterized in that: The lower swing arm mechanism is installed on the car body at the lower part of both sides of the door leaf, the upper sliding wheel faces upward and cooperates with the track on the door leaf, and the lower sliding wheel faces downward and contacts the door leaf.

6. The plug door system according to claim 5, characterized in that: The main structure also includes a limit pin connected to the door leaf.

7. The plug door system according to claim 5, characterized in that: The limit pin is arranged at the middle bottom position of the door leaf.

8. The plug door system according to any one of claims 1, 3, 5 or 7, characterized in that: The main structure of the driving mechanism includes a bearing cover plate and an end bearing mounting frame, a middle bearing mounting frame and a guide rail arranged thereon, as well as a Sierra guide column arranged on the end bearing mounting frame and the middle bearing mounting frame, an end Sierra hanger arranged on the end Sierra guide column, a middle Sierra hanger arranged on the middle Sierra guide column, a sliding guide column arranged between the end Sierra hanger and the middle Sierra hanger, a lead screw passing through the middle Sierra hanger, a door leaf bearing assembly arranged on the sliding guide column, and the main structure of the middle Sierra hanger includes a driving motor and a rotating frame and a driving gear connected thereto, and a roller assembly and a torsion spring arranged on the rotating frame.

9. The plug door system according to claim 8, characterized in that: An L-shaped slide groove is provided on the middle load-bearing mounting frame; the two ends of the lead screw are fixed on the end plug-in hangers, and two nuts and a follower pulley are provided in the middle, and the nuts are located on both sides of the follower pulley; the middle plug-in hanger is connected to the lead screw through a synchronous belt; the door leaf load-bearing assembly is connected to the door leaf; the driving gear is meshed with the driven gear, and the driven gear is connected to the driving synchronous pulley through a pin and then installed on the pin shaft; the roller assembly is embedded in the slide groove; the driving synchronous pulley is connected to the follower pulley through a synchronous belt.

10. The plug door system according to claim 9, characterized in that: During operation: the driving motor drives the lead screw to rotate, the end plug hanger and the middle plug hanger slide along the plug guide column, and the roller assembly slides along the slide groove. After being inserted into place, the roller assembly falls into the groove at the tail of the slide groove under the drive of the rotating frame to achieve locking. At this time, the rotation center of the roller assembly is lower than the horizontal line of the rotation center of the rotating frame, and the holding force provided by the torsion spring locks the locked state.

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