Caster assembly of seat and seat

Abstract

The utility model discloses a caster assembly of a seat and a seat, wherein the caster assembly of the seat comprises a wheel seat, a roller, a sliding assembly and a pedal; the roller is pivotally connected to the wheel seat, and a plurality of clamping parts arranged along the circumference of the roller are arranged on the roller; the sliding assembly is installed on the wheel seat and can slide relative to the wheel seat between a first position away from the roller and a second position close to the roller, and a clamping part is arranged on the sliding assembly, and the clamping part can be combined with one of the clamping parts to limit the freedom of rotation of the roller relative to the wheel seat when the sliding assembly moves to the second position; the pedal is installed on the wheel seat and can move up and down relative to the wheel seat between a third position and a fourth position, and the pedal is used to push the sliding assembly when moving downward from the third position to the fourth position, so that the sliding assembly moves from the first position to the second position. The utility model can realize the rapid locking and rapid unlocking of the caster assembly, and can conveniently and quickly adjust the position of the seat.

Description

Technical Field

[0001] The utility model relates to the technical field of seats, in particular to a caster assembly of a seat and the seat. Background Art

[0002] The legs of traditional chairs are directly supported on the ground, which makes it inconvenient to move the chairs. In order to improve this defect, some existing learning chairs or other functional chairs are usually equipped with caster assemblies at the bottom of the seats. The caster assemblies of common learning chairs on the market mostly use gravity self-locking wheels. During use, the user sits on the chair and presses down the chair according to the user's own weight to lock the caster assembly, that is, when sitting on the chair, the chair will not move. When the user stands up, the chair is no longer subjected to a large downward pressure, the caster assembly is unlocked, and the chair can be moved freely by pushing the chair. Although the existing chair caster assemblies using gravity self-locking wheels can be locked when sitting down and unlocked after standing up, when the user needs to move the chair, he must first get off the chair before pushing the chair to adjust it to a suitable position, and the use process is relatively cumbersome. Utility Model Content

[0003] The utility model aims to provide a caster assembly of a seat and a seat, which can realize quick locking and quick unlocking of the caster assembly and can move the seat when sitting down, so as to facilitate use.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] A caster assembly of the seat, including a wheel seat, rollers, a sliding assembly, and a footrest;

[0006] The roller is pivotally connected to the wheel seat, and a plurality of locking parts arranged along the circumference of the roller are provided on the roller;

[0007] The sliding assembly is mounted on the wheel seat and can slide relative to the wheel seat between a first position away from the roller and a second position close to the roller. The sliding assembly is provided with a clamping portion, which can be combined with one of the clamping portions when the sliding assembly moves to the second position to limit the freedom of rotation of the roller relative to the wheel seat.

[0008] The pedal is installed on the wheel seat and can move up and down relative to the wheel seat between a third position and a fourth position. The pedal is used to push the sliding assembly when moving downward from the third position to the fourth position, so that the sliding assembly moves from the first position to the second position.

[0009] Preferably, the sliding assembly includes a slider and a locking member mounted on the slider, and the clamping portion is arranged on the locking member; the slider is slidably mounted on the wheel seat and can slide between a first position and a second position along a first direction; the locking member is slidably mounted on the slider and can slide relative to the slider along a second direction, the second direction is parallel to the first direction, a first elastic element is arranged between the wheel seat and the locking member, the first elastic element is used to provide an elastic stress that pushes the locking member toward a direction close to the roller; a second elastic element is arranged between the wheel seat and the slider, the second elastic element is used to provide an elastic stress that always pushes the slider toward the first position.

[0010] Preferably, a slide groove extending along the second direction is provided on the slider, and a limit end wall is formed at one end of the slide groove close to the roller, and the locking member includes a rod portion slidably connected in the slide groove, and one end of the rod portion close to the roller is located outside the slide groove after passing through the limit end wall, and the part of the rod portion located inside the slide groove is provided with a limit boss protruding radially along the rod portion and abutting against the limit end wall, and the first elastic element is placed in the slide groove, and its two ends respectively abut against the wheel seat and the limit boss; the clamping portion is arranged on the part of the rod portion extending outside the slide groove.

[0011] Preferably, the portion of the rod located outside the slide groove extends toward both sides to form a clamping rod, and the ends of the two clamping rods pass through the two sides of the wheel seat respectively and form a clamping portion on the two sides of the wheel seat respectively; the roller includes two roller units and a wheel axle connected between the two roller units, the two roller units are respectively located on both sides of the wheel seat, the wheel axle is passed through the wheel seat so that the two roller units can pivotally cooperate with the wheel seat, and the two roller units are provided with a plurality of clamping portions arranged along the circumference thereof, and the clamping portions located on both sides of the wheel seat respectively match the clamping portions on the two roller units.

[0012] Preferably, the wheel seat includes a shell and a cover plate fixedly connected to the shell, the shell and the cover plate form an installation chamber, the slider is placed in the installation chamber, and the shell and / or the cover plate are provided with a linear guide pair extending along a first direction, and the slider cooperates with the linear guide pair so that the slider has the freedom to slide between a first position and a second position along the first direction.

[0013] Preferably, the locking portion is a locking groove arranged on the roller, and the engaging portion is a locking boss, and the locking boss matches the shape of the locking groove so that the locking boss is embedded in one of the locking grooves when the sliding assembly moves to the second position.

[0014] Preferably, a locking mechanism is provided between the pedal and the wheel seat, the locking mechanism being used to lock the pedal on the wheel seat when the pedal is subjected to downward pressure and moves downward from the third position to the fourth position so that the pedal remains in a locked state, and being used to release the pedal and the wheel seat when the pedal is in the locked state and subjected to downward pressure so that the pedal is in an unlocked state.

[0015] Preferably, the pedal includes a foot pedal placed above the wheel seat, a pressure rod located below the foot pedal, and the locking mechanism includes a push-type lock buckle and a lock pin; the top of the lock pin forms a hanging platform; the push-type lock buckle includes a shell fixed on the pressure rod, a movable buckle, a spring, and a pull rod, an opening is arranged at the bottom of the shell, and a guide groove is arranged on one side; the movable buckle is connected to the shell and can move relative to the shell in the height direction; the movable buckle is provided with two hooks located on the inner side of the opening at the bottom of the shell and opposite to each other, and the two hooks are respectively connected to the movable buckle by an elastic arm, so that when the movable buckle moves upward relative to the shell, the two hooks are squeezed on both sides of the opening so that the two hooks can be close to each other to lock. A fixed hanging platform, a portion of the movable buckle located between the two elastic arms forms a protrusion protruding downward and located above the hanging platform, the lower end of the pull rod is pivoted on the movable buckle, and the upper end forms a hanging shaft; the guide groove includes a first section extending obliquely from bottom to top, a second section extending obliquely downward from the top of the first section, a third section extending obliquely upward from the bottom of the second section, and a fourth section extending downward from the top of the third section, the bottom of the fourth section is connected to the bottom of the first section to form a closed structure for the guide groove, the hanging shaft is embedded in the guide groove and can slide in the guide groove; the two ends of the spring respectively abut against the outer shell and the movable buckle to apply downward elastic stress to the movable buckle.

[0016] Preferably, a mounting groove is provided on the pressure rod, and the outer shell is fixedly embedded in the mounting groove; a matching inclined surface is provided on the sliding assembly, which is gradually inclined from top to bottom in a direction away from the roller, and a pushing portion is provided at the bottom of the pressure rod to press against the matching inclined surface, and the top of the pressure rod abuts against the lower surface of the foot pedal, and a return spring is provided between the pressure rod and the foot pedal.

[0017] A seat, including the caster assembly of the seat mentioned above.

[0018] Compared with the prior art, the beneficial effects of the present invention are:

[0019] In the utility model, the sliding assembly is driven to move horizontally by the up and down movement of the foot pedal, so that the clamping part on the sliding assembly can be combined with or separated from the clamping part on the roller, thereby realizing the locking and unlocking of the roller and realizing the rapid locking and rapid unlocking of the caster assembly; in addition, the user can control the locking and unlocking of the roller through autonomous operation. When the seat position needs to be adjusted, there is no need to stand. The user only needs to sit on the seat and press the foot pedal to complete the relevant operations of the caster assembly. In this way, the position of the seat can be adjusted conveniently and quickly. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the installation of the utility model;

[0021] Figure 2 It is a schematic diagram of the structure of the utility model;

[0022] Figure 3 for Figure 1 A schematic diagram of the structure of the middle locking member;

[0023] Figure 4 for Figure 1 The structural diagram of the middle slider;

[0024] Figure 5 A schematic diagram of a working state of the utility model;

[0025] Figure 6 This is another working state schematic diagram of the utility model;

[0026] Figure 7 It is a structural schematic diagram of the locking mechanism in the utility model;

[0027] Figure 8 for Figure 7 A schematic diagram of the structure of the middle push-type lock housing;

[0028] Fig. 9 A schematic diagram of a working state of the locking mechanism of the utility model;

[0029] Fig.10 This is a schematic diagram of another working state of the locking mechanism of the utility model. DETAILED DESCRIPTION

[0030] Below, in conjunction with the accompanying drawings and specific implementation methods, the utility model is further described. It should be noted that, under the premise of no conflict, the various embodiments described below or the various technical features can be arbitrarily combined to form a new embodiment. Except for special instructions, the materials and equipment used in this embodiment can be purchased from the market. Examples of the embodiments are shown in the accompanying drawings, in which the same or similar numbers throughout represent the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0031] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "back", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation on the present application. In the description of the present application, "plurality" means two or more, unless otherwise precisely and specifically specified.

[0032] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "connected", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, or it can be connected through an intermediary medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0033] like Figure 1 , 2, 3, and 4 are caster assemblies of a seat of the utility model, which include a wheel seat 10, a roller, a sliding assembly 300, and a pedal 500, wherein the wheel seat 10 is mounted on the base or leg of the seat, the roller is pivotally connected to the wheel seat 10, the rotation axis of the roller relative to the wheel seat 10 is consistent with the Y direction in the figure, and a plurality of slots 211 arranged around the roller are provided on the roller; the sliding assembly 300 is mounted on the wheel seat 10, and has the freedom to slide relative to the wheel seat 10, and the movement direction of the sliding assembly 300 relative to the wheel seat 10 is perpendicular or substantially perpendicular to the Y direction in the figure. The preferred embodiment is that the movement trajectory of the sliding assembly 300 is perpendicular to the Y direction, and it can slide relative to the wheel seat 10 along the X direction in the figure, and is subject to the limitation of the internal structure of the wheel seat 10, and the sliding assembly 300 can slide along the X direction. The sliding assembly 300 slides relative to the wheel seat 10 between a first position away from the roller and a second position close to the roller, and a snap-in boss 44 is provided on the sliding assembly 300, and the shape of the snap-in boss 44 matches the shape of the slot 211. When the sliding assembly 300 is in the second position, the snap-in boss 44 moves with the sliding assembly 300 to a position close to the roller and snaps into one of the slots 211. At this time, the snap-in boss 44 cooperates with the slot 211 to form a limiting mechanism, and the limiting mechanism is used to limit the rotational freedom of the roller relative to the wheel seat 10. When the sliding assembly 300 is in the first position, the snap-in boss 44 moves with the sliding assembly 300 to a position away from the roller, so that the snap-in boss 44 and the slot 211 are in a separated state, and the rotational freedom of the roller relative to the wheel seat 10 is no longer limited. The pedal 500 is installed on the wheel seat 10, and can move up and down in the Z direction in the figure relative to the wheel seat 10. By utilizing the internal structure of the wheel seat 10 and the structure of the pedal 500 itself, the pedal 500 can move up and down relative to the wheel seat 10 between a third position at a high position and a fourth position at a low position along the Z direction. When the pedal 500 moves downward from the third position to the fourth position, the pedal 500 can push the sliding assembly 300 to move from the first position to the second position. That is to say, by operating the pedal 500, after the pedal 500 moves downward in the Z direction for a certain stroke, the pedal 500 can push the sliding assembly 300 to move in the X direction toward the roller for a certain stroke, so that the engaging boss 44 on the sliding assembly 300 is engaged in one of the engaging grooves 211, thereby braking the roller in the caster assembly.

[0034] The clamping boss 44 can be replaced by a clamping part with other structural forms, and the clamping groove 211 can also be replaced by a clamping part with other structural forms. For example, the multiple clamping parts provided on the roller are convex structures, and the corresponding clamping part is a groove structure. When the roller is locked, one of the convex structures on the roller is clamped into the groove structure. Of course, the clamping part and the clamping part can also be other structures that can interlock when they move to a state close to each other.

[0035] In the utility model, the sliding assembly 300 is driven to move horizontally by the up and down movement of the foot pedal 500, so that the clamping portion on the sliding assembly 300 can be combined with or separated from the clamping portion on the roller, thereby realizing the locking and unlocking of the roller and realizing the rapid locking and rapid unlocking of the caster assembly; in addition, the user can control the locking and unlocking of the roller through autonomous operation. When the seat position needs to be adjusted, there is no need to stand. The user only needs to sit on the seat and press the foot pedal 500 to complete the relevant operations of the caster assembly. In this way, the position of the seat can be adjusted conveniently and quickly.

[0036] In a preferred embodiment, the sliding assembly 300 includes a slider 30 and a locking member 40, the above-mentioned snap-in boss 44 is arranged on the locking member 40, the locking member 40 is installed on the slider 30, the slider 30 is slidably installed inside the wheel seat 10, so that the slider 30 can slide relative to the wheel seat 10 along a first direction (i.e., the X direction in the figure), that is, the slider 30 can slide between a first position and a second position in the X direction, and the locking member 40 is slidably installed on the slider 30 so that the locking member 40 can slide relative to the slider 30 along a second direction, which is parallel to the above-mentioned first direction, and also That is, the direction in which the locking member 40 slides relative to the slider 30 is consistent with the X direction in the figure, and a spring 401 is arranged between the wheel seat 10 and the locking member 40, one end of the spring 401 abuts against the wheel seat 10, and the other end abuts against the locking member 40, thereby applying an elastic stress to the locking member 40 to push the locking member 40 toward the direction close to the roller; a spring 301 is arranged between the wheel seat 10 and the slider 30, one end of the spring 301 abuts against the wheel seat 10, and the other end abuts against the slider 30, thereby applying an elastic stress to the slider 30 to always push the slider 30 toward the first position. The spring 301 provides elastic stress for restoring the slider 30. When the pedal 500 is pressed downward, the pedal 500 moves downward from the third position to the fourth position. At the same time, the slider 30 moves from the first position to the second position. The spring 301 is compressed. When the pedal 500 is released, the pedal 500 is reset upward to the third position. Under the elastic stress of the spring 301, the slider 30 is reset to the first position, so that the engaging boss 44 on the locking member 40 is disengaged from the engaging groove 211 on the roller, thereby unlocking the roller. Figure 5 As shown, when the roller is in the unlocked state, the footrest 500 is in the third position, and under the elastic stress of the spring 301, the slider 30 is in the first position. Under the limitation of the slider 30, the engaging boss 44 on the locking member 40 is disengaged from the engaging groove 211. At this time, the roller can rotate freely, that is, the user can move the seat to a suitable position when sitting on the seat. When the movement of the seat is completed, see Figure 6As shown, the foot pedal 500 is pressed downward to push the slider 30 to move to the second position. After the slider 30 moves a certain distance in the direction close to the roller, the slider 30 no longer limits the locking member 40. The locking member 40 moves a certain distance in the direction close to the roller under the elastic stress of the spring 401, so that the engaging boss 44 is engaged in one of the engaging grooves 211. The rotational freedom of the roller is limited, that is, the roller can no longer rotate freely relative to the wheel seat. At this time, the seat can be maintained in the moved position to ensure that the seat can be used normally. When the slider 30 is moved to the second position close to the roller, the engaging boss 44 on the locking member 40 is not necessarily aligned with one of the slots 211 on the roller. If the locking member 40 is rigidly assembled to the slider 30, the engaging boss 44 on the locking member 40 will be combined with the slot 211 when it is not aligned with the slot 211, which may easily cause damage to the locking member 40, the slider 30 and the roller. Therefore, the utility model installs the locking member 40 on the slider 30 in a sliding manner and buffers it with the spring 401 until the engaging boss 44 is directly opposite to the slot 211. The elastic stress of the spring 401 pushes the locking member 44 so that the engaging boss 44 is completely embedded in the slot 211, that is, the spring 401 and the sliding matching structure of the locking member 40 and the slider 30 are used to protect the relevant components.

[0037] The slider 30 is provided with a slide groove 32 extending along the second direction, and a limiting end wall 33 is formed at one end of the slide groove 32 close to the roller. The locking member 40 includes a rod portion 41 slidably connected in the slide groove 32, and one end of the rod portion 41 close to the roller passes through the limiting end wall 33 and is located outside the slide groove 32. A limiting boss 43 protruding radially along the rod portion 41 is provided on the portion of the rod portion 41 located inside the slide groove 32, and the limiting boss 43 abuts against the limiting end wall 33. The spring 401 is located inside the slide groove 32, and the two ends of the spring 401 respectively abut against the wheel seat 10 and the limiting boss 43; the above-mentioned clamping boss 44 is located on the portion of the rod portion 41 extending outside the slide groove 32. Through the elastic stress of the spring 401, the locking member 40 always has the tendency to move toward the roller, and the limiting end wall 33 and the limiting boss 43 cooperate with each other to limit the locking member 40. When the limiting end wall 33 is in the first position along with the slider 30, the locking member 40 is in a position away from the roller. When the limiting end wall 33 moves a certain distance towards the roller to the second position along with the slider 30, under the action of the elastic stress of the spring 401, the locking member 40 moves to a position close to the roller, so that the engaging boss 44 can be engaged in the roller groove 211. The locking member 40 also includes two clamping rods 42, which are connected to one end of the rod portion 41 extending out of the slide groove 32 and extend to both sides of the rod portion 41 respectively, so that the two clamping rods 42 and the rod portion 41 form a "T"-shaped structure, and the ends of the two clamping rods 42 respectively pass through the two sides of the wheel seat 10 and form a clamping boss 44 on both sides of the wheel seat 10; the roller includes two roller units 21 and a wheel axle 22 connected between the two roller units 21, the two roller units 21 are respectively located on both sides of the wheel seat 10, the wheel axle 22 is connected to the wheel seat 10 so that the two roller units 21 are pivotally matched with the wheel seat 10, and a plurality of clamping grooves 211 are respectively provided on the side of the two roller units 21 facing the wheel seat 10, and the plurality of clamping grooves 211 are arranged around the circumference of the roller unit 21, and the two clamping bosses 44 located on both sides of the wheel seat 10 are respectively matched with the clamping grooves 211 on the two roller units 21. The hole for the rod 41 to pass through the limiting end wall 33 is configured to allow the limiting boss 43 to pass through. During installation, the rod 41 is passed through the hole on the limiting end wall 33 from the side of the limiting end wall 33 away from the slide groove 32, and then the locking member 40 is rotated 90° as a whole, so that the limiting boss 43 is offset from the extended part of the hole, so that the limiting end wall 33 can limit the position of the limiting boss 43. In other embodiments, the above-mentioned multiple slots 211 can also be set on the wheel shaft 22, and the roller unit 21 can be connected to the end of the wheel shaft 22 in a fixed matching manner, that is, by limiting the rotational freedom of the wheel shaft 22 relative to the wheel seat 10, the roller unit 21 is locked.

[0038] It should be noted that the spring 301 and the spring 401 mentioned above can actually be replaced by other elastic elements, such as elastic rubber blocks.

[0039] In order to facilitate the installation of the slider 30 and the locking member 40 inside the wheel seat 10, the wheel seat 10 of the utility model is a hollow structure, which includes a shell 11 and a cover plate 12. The cover plate 12 is fixed to the shell 11 by screws, and an installation chamber is formed by the shell 11 and the cover plate 12. The slider 30 is placed in the installation chamber. A linear guide pair extending along a first direction is provided on the shell 11. The slider 30 cooperates with the linear guide pair so that the slider 30 has the freedom to slide between a first position and a second position along the first direction. The linear guide pair can also be provided on the cover plate 12, or a linear guide pair can be provided on the shell 11 and the cover plate 12 at the same time to limit the sliding of the slider 30. Specifically, the linear guide pair can be a guide groove provided on the shell 11, and a guide rib 34 is provided on the side of the slider 30, and the guide rib 34 is slidably embedded in the guide groove.

[0040] See also Figure 1 , 2As shown in Figures 7 and 8, in another preferred embodiment, the utility model provides a locking mechanism between the pedal 500 and the wheel seat 10. When the pedal 500 is subjected to downward pressure and moves downward from the third position to the fourth position, the locking mechanism can lock the pedal 500 on the wheel seat 10 to keep the pedal 500 in a locked state. In this way, when the pedal 500 is not operated, the pedal 500 is kept in the locked state to keep the sliding assembly 300 in the second position, and the locking member 40 keeps the roller locked. At the same time, the locking mechanism is also used to release the pedal 500 from the wheel seat 10 when the pedal 500 is in the locked state and subjected to downward pressure, so that the pedal 500 is in an unlocked state. When the pedal 500 is in the unlocked state, the pedal 500 no longer limits the sliding assembly 300, and the sliding assembly 300 can be reset to the first position to unlock the roller. Specifically, the pedal 500 includes a footrest 50 located above the wheel seat 10 and a pressure rod 60 located below the footrest 50. The locking mechanism includes a push-type lock buckle 70 and a lock pin 80. The bottom of the lock pin 80 is connected to the wheel seat 10, and a hanging platform 81 is provided on the top; the push-type lock buckle 70 includes a shell 71 fixed on the pressure rod 60, a movable buckle 72, a spring 74, and a pull rod 73. The bottom of the shell 71 is provided with an opening 712, and one side is provided with a guide groove 711. The movable buckle 72 is connected to the inside of the shell 71 and can be The movable buckle 72 moves relative to the housing 71 in the height direction. Two hooks 721 are set at the bottom of the movable buckle 72. The two hooks 721 are arranged opposite to each other and are both located on the inner side of the opening 712. The two hooks 721 are connected to the movable buckle 72 through an elastic arm 722 respectively. The elastic arm 722 allows the two hooks 721 to always maintain a tendency to swing to both sides, so that the outer sides of the two hooks 721 are respectively abutted against the two sides of the opening 712. When the movable buckle 72 moves upward relative to the housing 71, the two sides of the opening 712 respectively hold the two hooks 721 The two hooks 721 are pressed inwardly so that they can be brought close to each other to lock the hanging platform 81. A protrusion 723 protruding downward and located above the hanging platform 81 is formed on the part of the movable buckle 72 located between the two elastic arms 722; a rotating shaft 731 is provided at the lower end of the pull rod 73 to pivot the lower end of the pull rod 73 on the movable buckle 72, and a hanging shaft 732 is formed at the upper end; the guide groove 711 includes a first section 7111 extending obliquely from bottom to top, a second section 7112 extending obliquely downward from the top of the first section 7111, The third section 7113 extends upward obliquely from the bottom of the second section 7112, and the fourth section 7114 extends downward from the top of the third section 7113. The bottom of the fourth section 7114 is connected to the bottom of the first section 7111 to form a closed structure of the guide groove 711. The hanging shaft 732 of the pull rod 73 is embedded in the guide groove 711 and can slide in the guide groove 711. The upper end of the spring 74 abuts against the outer shell 71 and the lower end abuts against the movable buckle 72, applying a downward elastic stress to the movable buckle 72.When the pedal 500 is in the third position (ie, the pedal 50 and the pressure rod 60 are in the third position), the push-type lock buckle 70 and the lock pin 80 are in a separated state, and the hanging shaft 732 of the pull rod 73 is in. Figure 7 When the locking cam 720 is in the unlocked state, the locking cam 720 is in the unlocked state, and the locking cam 720 is locked. The first section 7111 moves upward, and at the same time, the two hooks 721 gradually move closer. When the pressure rod 60 moves downward to the fourth position along with the pedal 50, the connecting shaft 732 moves to the top of the first section 711. At this time, the pressure of the pedal 50 is released. Under the elastic stress of the spring 74, the connecting shaft 732 slides along the second section 7112 to the junction of the second section 7112 and the third section 7113. Due to the V-shaped structure formed by the second section 7112 and the third section 7113, the connecting shaft 732 is connected, so that the connecting shaft 732 is kept in this position, that is, Fig. 9 In the state shown, at this time, the movable buckle 72 cannot move downward relative to the housing 71, and the two retracted hooks 721 clamp and lock the hanging platform 81, the pressing rod 60 is pulled by the locking pin 80 and will not move upward, the footrest 500 is in the fourth position and remains in the state of pushing the sliding assembly 300, that is, the sliding assembly 300 remains in the state shown in FIG. Figure 6 In the state shown, the locking member 40 locks the roller. When the roller needs to be unlocked, the foot pedal 50 is pressed downward, the pressure rod 60 drives the push-type lock buckle 70 to move downward, the top of the hanging platform 81 pushes the movable buckle 72 upward, and the hanging shaft 732 moves upward along the third section 7113 until the hanging shaft 732 slides to the position where the third section 7113 and the fourth section 7114 are connected, that is, Fig.10 In the state shown, under the elastic stress of the spring 74, the hook shaft 732 slides along the fourth section 7114 to Figure 7 During this process, the movable buckle 72 moves downward, and the two hooks 721 are no longer squeezed by the opening 712, and are in a mutually open state and release the hanging platform 81. The elastic stress of the spring 74 can make the housing 71 move upward, and then the pedal 500 is reset upward to the third position as a whole. Figure 5 Status shown.

[0041] A mounting groove 61 is provided on the pressure rod 60, and the shell 71 of the push-type lock 70 is fixedly embedded in the mounting groove 61 so that the shell 71 and the pressure rod 60 are kept fixed. A matching inclined surface 31 is provided on the slider 30 of the sliding assembly 300, and the matching inclined surface 31 gradually inclines from top to bottom in the direction away from the roller. A pushing portion 62 is provided at the bottom of the pressure rod 60 to press on the matching inclined surface 31. The top of the pressure rod 60 presses against the lower surface of the foot pedal 50, and a return spring 51 is also provided between the pressure rod 60 and the foot pedal 50. An upward elastic stress is applied to the foot pedal 50 through the return spring 51, and the above-mentioned spring 74 is cooperated to provide an upward return elastic stress to the foot pedal 500.

[0042] The seat of the utility model comprises the caster assembly of the seat mentioned above, and other structures of the seat are the same as those in the prior art and will not be described in detail here.

[0043] Finally, it should be noted that the above-mentioned implementation modes are only optional embodiments of the present invention and cannot be used to limit the scope of protection of the present invention. Any non-substantial changes and substitutions made by technicians in this field on the basis of the present invention shall fall within the scope of protection required by the present invention.

Claims

1. The caster assembly of the seat is characterized in that: It includes a wheel seat, a roller, a sliding assembly, and a footrest; The roller is pivotally connected to the wheel seat, and a plurality of locking parts arranged along the circumference of the roller are provided on the roller; The sliding assembly is mounted on the wheel seat and can slide relative to the wheel seat between a first position away from the roller and a second position close to the roller. The sliding assembly is provided with a clamping portion, which can be combined with one of the clamping portions when the sliding assembly moves to the second position to limit the freedom of rotation of the roller relative to the wheel seat. The pedal is mounted on the wheel seat and can move up and down relative to the wheel seat between a third position and a fourth position. The pedal is used to push the sliding assembly when moving downward from the third position to the fourth position, so that the sliding assembly moves from the first position to the second position. The sliding assembly includes a slider and a locking member installed on the slider, and a clamping portion is arranged on the locking member; the slider is slidably installed on the wheel seat and can slide between a first position and a second position along a first direction; the locking member is slidably installed on the slider and can slide relative to the slider along a second direction, and the second direction is parallel to the first direction. A first elastic element is arranged between the wheel seat and the locking member, and the first elastic element is used to provide an elastic stress that pushes the locking member toward a direction close to the roller; a second elastic element is arranged between the wheel seat and the slider, and the second elastic element is used to provide an elastic stress that always pushes the slider toward the first position.

2. The caster assembly of a chair as claimed in claim 1, characterized in that: The slider is provided with a slide groove extending along the second direction, and a limit end wall is formed at one end of the slide groove close to the roller. The locking member includes a rod portion slidably connected in the slide groove, and one end of the rod portion close to the roller is located outside the slide groove after passing through the limit end wall. The portion of the rod portion located inside the slide groove is provided with a limit boss protruding radially along the rod portion and abutting against the limit end wall. The first elastic element is placed in the slide groove, and its two ends respectively abut against the wheel seat and the limit boss; the clamping portion is arranged on the portion of the rod portion extending outside the slide groove.

3. The caster assembly of a chair as claimed in claim 2, characterized in that: The part of the rod located outside the slide groove extends toward both sides to form a clamping rod, and the ends of the two clamping rods pass through the two sides of the wheel seat respectively and form a clamping part on the two sides of the wheel seat respectively; the roller includes two roller units and a wheel axle connected between the two roller units, the two roller units are respectively located on both sides of the wheel seat, the wheel axle passes through the wheel seat so that the two roller units can be pivotally matched with the wheel seat, and the two roller units are provided with a plurality of clamping parts arranged along the circumference thereof, and the clamping parts located on both sides of the wheel seat respectively match the clamping parts on the two roller units.

4. The caster assembly of a chair as claimed in claim 3, characterized in that: The wheel seat includes a shell and a cover plate fixedly connected to the shell. The shell and the cover plate form an installation chamber. The slider is placed in the installation chamber. A linear guide pair extending along a first direction is provided on the shell and / or the cover plate. The slider cooperates with the linear guide pair so that the slider has the freedom to slide between a first position and a second position along the first direction.

5. The caster assembly of a chair as claimed in claim 1, characterized in that: The clamping portion is a clamping slot arranged on the roller, and the clamping portion is a clamping boss. The shape of the clamping boss matches that of the clamping slot, so that the clamping boss is embedded in one of the clamping slots when the sliding assembly moves to the second position.

6. The caster assembly of a chair as claimed in claim 1, characterized in that: A locking mechanism is provided between the pedal and the wheel seat, and the locking mechanism is used to lock the pedal on the wheel seat when the pedal moves downward from the third position to the fourth position under downward pressure so that the pedal remains in a locked state, and is used to release the pedal and the wheel seat when the pedal is in the locked state and under downward pressure so that the pedal is in an unlocked state.

7. The caster assembly of a chair as claimed in claim 6, characterized in that: The pedal comprises a footrest placed above the wheel seat and a pressure rod located below the footrest, and the locking mechanism comprises a push-type lock buckle and a lock pin; the top of the lock pin forms a hanging platform; the push-type lock buckle comprises a shell fixed on the pressure rod, a movable buckle, a spring, and a pull rod, an opening is arranged at the bottom of the shell, and a guide groove is arranged on one side; the movable buckle is inserted into the shell and can move relative to the shell in the height direction; the movable buckle is provided with two hooks located inside the opening at the bottom of the shell and opposite to each other, and the two hooks are respectively connected to the movable buckle through an elastic arm, so that when the movable buckle moves upward relative to the shell, the two hooks are respectively squeezed on both sides of the opening so that the two hooks can be brought close to each other to lock the hook The hanging platform is a platform, the part of the movable buckle located between the two elastic arms forms a protrusion protruding downward and located above the hanging platform, the lower end of the pull rod is pivoted on the movable buckle, and the upper end forms a hanging shaft; the guide groove includes a first section extending obliquely from bottom to top, a second section extending obliquely downward from the top of the first section, a third section extending obliquely upward from the bottom of the second section, and a fourth section extending downward from the top of the third section, the bottom of the fourth section is connected to the bottom of the first section to form a closed structure of the guide groove, the hanging shaft is embedded in the guide groove and can slide in the guide groove; the two ends of the spring respectively press against the shell and the movable buckle to apply downward elastic stress to the movable buckle.

8. The caster assembly of a chair as claimed in claim 7, characterized in that: The pressure rod is provided with a mounting groove, and the outer shell is fixedly embedded in the mounting groove; the sliding component is provided with a matching inclined surface which is gradually inclined from top to bottom in a direction away from the roller, and the bottom of the pressure rod is provided with a pushing portion which presses on the matching inclined surface, and the top of the pressure rod is against the lower surface of the foot pedal, and a return spring is provided between the pressure rod and the foot pedal.

9. A seat, characterized in that: A castor assembly for a seat comprising the seat described in any one of claims 1-8.

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