Armrest mounting unit, cart and seat assembly

Abstract

To provide armrest mounting units, carts and a seat assembly that enable quick attachment to and removal from a frame and are used conveniently.SOLUTION: The armrest mounting unit includes a fixed base, a connecting base, a first magnetic attraction member, and a locking mechanism set. The first magnetic attraction member is fixed on one of the fixed base and the connecting base. The locking mechanism set is disposed on the other of the fixed base and the connecting base. When the locking mechanism set is in a locked state, the connecting base is fixable on the fixed base through the locking mechanism set. When the locking mechanism set is in an unlocked state, the connecting base is separable from the fixed base. The first magnetic attraction member forms a magnetic action with the locking mechanism set and can assist in positioning and separation of the fixed base and the connecting base.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to the technical field of carriers, and more particularly to armrest mounting units, carts and seat assemblies. [Background technology]

[0002] Many carts currently on the market, such as baby strollers and care vehicles, often have detachable armrest bodies and frames. However, the armrest body cannot be locked to the frame unless it is accurately positioned during installation, and the locking force between the armrest body and the frame must be resisted during removal. After unlocking the armrest body, the armrest cannot automatically pop open, and additional force must be applied to remove the armrest body, making the process very inconvenient and preventing quick installation and removal. Summary of the Invention [Problem to be solved by the invention]

[0003] In view of this, there is a need to provide an armrest mounting unit, a cart and a seat assembly, in which the armrest mounting unit and the armrest body of the cart can be quickly attached and detached to the frame, and are convenient to use. [Means for solving the problem]

[0004] The armrest mounting unit includes a fixed base, a connecting base, a first magnetic attraction member, and a locking mechanism set, wherein the first magnetic attraction member is fixed to one of the fixed base and the connecting base, and the locking mechanism set is provided on the other of the connecting base and the fixed base, and when the locking mechanism set is in a locked state, the connecting base can be fixed to the fixed base by the locking mechanism set, and when the locking mechanism set is in an unlocked state, the connecting base can be separated from the fixed base, and the first magnetic attraction member forms a magnetic force interaction with the locking mechanism set to assist in positioning and separating the fixed base and the connecting base.

[0005] With the armrest mounting unit, the magnetic force (including attractive and / or repulsive forces) formed between the first magnetic attraction member and the locking mechanism set allows the locking mechanism set to switch between a locked state in which the fixed base is fixed to the connecting base and an unlocked state in which the fixed base is separated from the connecting base.When the fixed base and the connecting base are respectively attached to, for example, the armrest main body frame, quick attachment and detachment of the armrest main body to the frame can be achieved, making it convenient to use.

[0006] In one embodiment, the locking mechanism set is provided on the connecting base and includes an unlocking member, an engaging member, and a second magnetically attractive member, the unlocking member being operable to move between a first locked position and a first unlocked position, the engaging member being provided on the connecting base, and the second magnetically attractive member being movably provided on the connecting base and capable of forming a magnetic force interaction with the first magnetically attractive member.

[0007] In one embodiment, the locking mechanism set further includes a rotating member, the rotating member rotatably mounted on the connecting base and having a first rotation position and a second rotation position, the second magnetic attraction member is mounted on the rotating member, and both ends of the second magnetic attraction member are a first magnetic pole and a second magnetic pole, respectively, when the rotating member is in the first rotation position, the first magnetic pole and the first magnetic attraction member face each other and attract each other, when the rotating member is in the second rotation position, the second magnetic pole and the first magnetic attraction member face each other and repel each other, when the unlocking member is in the first lock position, the unlocking member drives the rotating member to rotate to the first rotation position, and when the unlocking member is in the first unlock position, the unlocking member drives the rotating member to rotate to the second rotation position.

[0008] In one embodiment, the locking mechanism set further includes a connecting shaft fixed to the connecting base, and the rotating member is drilled through the connecting shaft and is rotatable relative to the connecting shaft.

[0009] In one embodiment, the unlocking member is provided with a serration portion, the rotating member is provided with a gear portion that can mesh with the unlocking member, and the unlocking member drives the rotation of the rotating member by engaging the serration portion with the gear portion.

[0010] In one embodiment, the unlocking member is movable between the first lock position and the second unlocked position, the unlocking member is provided with a serration portion, the serration portion is arranged along the movement direction of the unlocking member, the rotating member is provided with a gear portion that can mesh with the unlocking member, the gear portion is arranged to protrude from the surface on one side of the rotating member, and the serration portion meshes with the gear portion.

[0011] In one embodiment, the second magnetically attractive member is fixedly connected to the unlocking member, and when the unlocking member is in the first lock position, the second magnetically attractive member can face the first magnetically attractive member and form a magnetic attraction effect, and when the unlocking member is in the first unlock position, the second magnetically attractive member can be displaced from the first magnetically attractive member to release the magnetic attraction effect.

[0012] In one embodiment, the second magnetically attractive member is a permanent magnet, or the second magnetically attractive member is made of a ferromagnetic material.

[0013] In one embodiment, the locking mechanism set further includes a third magnetically attractive member, the second magnetically attractive member and the third magnetically attractive member are spaced apart and fixedly connected to the unlocking member, and when the unlocking member is in the first locking position, the second magnetically attractive member and the first magnetically attractive member face each other and can be attracted to each other, and when the unlocking member is in the first unlocking position, the third magnetically attractive member and the first magnetically attractive member face each other and can repel each other.

[0014] In one embodiment, the locking mechanism set further includes a movable member, the second magnetically attractive member and the third magnetically attractive member are spaced apart from each other on the movable member, and the movable member is fixed to the unlocking member.

[0015] In one embodiment, the engaging member has an abutment portion, and the unlocking member has a push-up portion, and in the process of the unlocking member moving from the first lock position to the first unlocked position, the push-up portion can push up the abutment portion so as to release the engagement between the engaging member and the fixed base.

[0016] In one embodiment, the engagement member has an engagement arm, the fixed base has an engagement groove, and when the unlocking member is in the first lock position, the engagement arm can engage with the engagement groove, and when the unlocking member is in the first unlock position, the engagement arm can disengage from the engagement groove.

[0017] In one embodiment, the engaging member has an abutment portion, and the unlocking member has a push-up portion, and in the process of the unlocking member moving from the first lock position to the first unlocked position, the push-up portion can push up the abutment portion so that the engaging member elastically deforms and releases engagement with the fixed base.

[0018] In one embodiment, the engaging member has an engaging arm, the abutment portion is provided on the engaging arm, the fixed base has an engaging groove, and the push-up portion has a push-up slope, and in the process of the unlocking member moving from the first lock position to the first unlocking position, the push-up slope can push up the abutment portion so that the engaging arm elastically deforms in a direction away from the engagement groove.

[0019] In one embodiment, the engaging member further includes a fixing portion, the fixing portion being connected to the engaging arm, and the fixing portion being fixed to the connecting base.

[0020] In one embodiment, the unlocking member includes an operating portion operable to move the unlocking member between the first locked position and the first unlocked position.

[0021] In one embodiment, the locking mechanism set further includes an operating member, the unlocking member includes an operating portion, the operating member is connected to or abuts the operating portion, and the operating member is operable by the operating portion to drive the movement of the unlocking member between the first locked position and the first unlocked position.

[0022] In one embodiment, the engagement member includes two engagement arms arranged opposite each other and a fixed portion connected between the two engagement arms, the fixed portion being fixed to the connecting base, the fixed base having an annular engagement groove, the fixed base being positioned between the two engagement arms and having abutment portions on the two engagement arms, the unlocking member having two push-up portions arranged opposite each other, when the unlocking member is in the first lock position, both of the two engagement arms engage with the engagement grooves, and in the process of the unlocking member moving from the first lock position to the first unlock position, the two push-up portions respectively push up the two abutment portions so that the two engagement arms elastically deform in directions away from each other until both of the engagement arms disengage from the engagement grooves.

[0023] In one embodiment, the unlocking member further includes two operating parts, the two operating parts being fixedly connected to the two push-up parts respectively, and the two operating parts being operable to drive the movement of the two push-up parts.

[0024] In one embodiment, the unlocking member further includes an operating portion, the operating portion being connected to the two push-up portions, and the operating portion being operable to drive the movement of the two push-up portions.

[0025] In one embodiment, the locking mechanism set further includes a return member, the return member being disposed between the unlocking member and the connecting base and adapted to bias the unlocking member to move to the first locking position.

[0026] In one embodiment, the connecting base includes a first cover and a second cover, and a storage space is formed by being surrounded by the first cover and the second cover, and the engaging member, the second magnetic attraction member, and at least a part of the unlocking member are all provided in the storage space.

[0027] In one embodiment, the fixed base has a first socket portion, the connecting base has a second socket portion, and when the connecting base is engaged and locked with the fixed base, the second socket portion is fitted onto the first socket portion.

[0028] The cart includes a frame, an armrest body, and an armrest mounting unit described in any of the above embodiments, wherein the fixed base is provided on one of the frame and the armrest body, the connecting base is provided on the other of the frame and the armrest body, and the armrest body is removably attached to the frame by the armrest mounting unit.

[0029] In one embodiment, there are two armrest mounting units, and both ends of the armrest body are removably mounted to both sides of the frame by the two armrest mounting units, respectively.

[0030] In one embodiment, the frame includes a seat assembly, and the cart further includes a restraining band, a locking fastener set, and a positioning mechanism, wherein the restraining band is provided on the seat assembly and has a restrained position and an open position, the locking fastener set is connected to the restraining band and has a locked state and an unlocked state, and the positioning mechanism is provided between the restraining band and the seat assembly, and when the locking fastener set is in the locked state, the locking fastener set is connected to the restraining band and can hold the restraining band in the restrained position, and when the locking fastener set is in the unlocked state, the positioning mechanism can hold the restraining band in the open position.

[0031] In one embodiment, the positioning mechanism includes a fourth magnetically attractive member provided on the seat assembly and a fifth magnetically attractive member provided on the restraint band, and the fourth magnetically attractive member and the fifth magnetically attractive member are capable of attracting each other to hold the restraint band in the open position.

[0032] In one embodiment, the positioning mechanism further includes a protective piece fitted over the restraint band, a fourth magnetic attraction member provided on the seat assembly, and a fifth magnetic attraction member provided on the protective piece, and one end of the restraint band can extend from the protective piece.

[0033] In one embodiment, the positioning mechanism includes a protective piece fitted over the restraining band and a flexible rebound member provided within the protective piece, which always moves the restraining band to the open position.

[0034] In one embodiment, the flexible rebound member is made of plastic, steel or metal material.

[0035] In one embodiment, the seat assembly includes a seat portion for carrying a passenger, the seat portion having a first side facing away from the passenger and a second side facing the passenger, a perforation hole provided in the seat portion, the protective piece including a first piece and a second piece connected to each other, the maximum width of the first piece being greater than the diameter of the perforation hole, the width of one end of the second piece connected to the first piece being less than the diameter of the perforation hole, the protective piece being perforated in the perforation hole, and the first piece being located on the first side of the seat portion, and the second piece being located on the second side of the seat portion.

[0036] In one embodiment, the flexible resilient member extends from the first piece to the second piece.

[0037] In one embodiment, the flexible resilient member has a first elastic portion and a second elastic portion connected to each other, the first elastic portion being located within the first piece, the second elastic portion being located within the second piece, and the maximum width of the first elastic portion being greater than the maximum width of the second elastic portion.

[0038] In one embodiment, the positioning mechanism further includes a fourth magnetically attractive member provided on the seat assembly and a fifth magnetically attractive member provided on the protective piece, and the fourth magnetically attractive member and the fifth magnetically attractive member are capable of attracting each other to hold the restraint band in the open position.

[0039] In one embodiment, the positioning mechanism further includes a fourth magnetic attraction member provided on the seat assembly, the flexible repulsion member being made of a ferromagnetic material, the flexible repulsion member always moving the restraint band to the open position, and the fourth magnetic attraction member and the flexible repulsion member being capable of attracting each other to hold the restraint band in the open position.

[0040] In one embodiment, the protective piece has an opening and the flexible rebound member is removable from the protective piece through the opening, or the protective piece has a pocket and the flexible rebound member is removably inserted into the pocket.

[0041] In one embodiment, the flexible resilient member is a fishbone spring.

[0042] In one embodiment, the fishbone spring is fixed to the inside of the protective piece by stitching.

[0043] In one embodiment, the protective piece is filled with a buffer material, and the flexible rebound member is located between the buffer material and the restraining band.

[0044] In one embodiment, the positioning mechanism includes a protective piece fitted over the restraining band, the protective piece being made of a flexible rubber material.

[0045] In one embodiment, the restraining band includes a crotch belt extending between the thighs of the seat occupant, and the positioning mechanism is provided between the crotch belt and the seat assembly.

[0046] The seat assembly includes a seat portion, a restraining band, a locking fastener set, and a positioning mechanism, wherein the restraining band is provided on the seat portion and has a restraining position and an open position, the locking fastener set is connected to the restraining band and has a locked state and an unlocked state, the positioning mechanism is located between the restraining band and the seat portion, and when the locking fastener set is in the locked state, the locking fastener set is connected to the restraining band and can hold the restraining band in the restrained position, and when the locking fastener set is in the unlocked state, the positioning mechanism can hold the restraining band in the open position.

[0047] In one embodiment, the positioning mechanism includes a fourth magnetic attraction member provided on the seat portion and a fifth magnetic attraction member provided on the restraint band, and the fourth magnetic attraction member and the fifth magnetic attraction member are capable of attracting each other to hold the restraint band in the open position.

[0048] In one embodiment, the positioning mechanism further includes a protective piece fitted over the restraint band, a fourth magnetic attraction member provided on the seat portion, and a fifth magnetic attraction member provided on the protective piece, and one end of the restraint band can extend from the protective piece.

[0049] In one embodiment, the positioning mechanism includes a protective piece fitted over the restraining band and a flexible rebound member provided within the protective piece, which always moves the restraining band to the open position.

[0050] In one embodiment, the flexible rebound member is a sheet-like structure made of plastic, steel or metal material.

[0051] In one embodiment, the seat portion has a first side facing away from the occupant and a second side facing the occupant, a perforation hole is provided in the seat portion, the protective piece includes a first piece and a second piece connected to each other, the maximum width of the first piece is larger than the diameter of the perforation hole, the width of one end of the second piece connected to the first piece is smaller than the diameter of the perforation hole, the protective piece is perforated in the perforation hole, and the first piece is located on the first side of the seat portion, and the second piece is located on the second side of the chair.

[0052] In one embodiment, the flexible resilient member extends from the first piece to the second piece.

[0053] In one embodiment, the flexible resilient member has a first elastic portion and a second elastic portion connected to each other, the first elastic portion being located within the first piece, the second elastic portion being located within the second piece, and the maximum width of the first elastic portion being greater than the maximum width of the second elastic portion.

[0054] In one embodiment, the positioning mechanism includes a fourth magnetic attraction member provided on the seat portion and a fifth magnetic attraction member provided on the protective piece, and the fourth magnetic attraction member and the fifth magnetic attraction member are capable of attracting each other to hold the restraint band in the open position.

[0055] In one embodiment, the positioning mechanism further includes a fourth magnetic attraction member provided on the seat portion, the flexible repulsion member being made of a ferromagnetic material, the flexible repulsion member always moving the restraint band to the open position, and the fourth magnetic attraction member and the flexible repulsion member being capable of adsorbing to each other to hold the restraint band in the open position.

[0056] In one embodiment, the protective piece has an opening and the flexible rebound member is removable from the protective piece through the opening, or the protective piece has a pocket and the flexible rebound member is removably inserted into the pocket.

[0057] In one embodiment, the flexible resilient member is a fishbone spring.

[0058] In one embodiment, the fishbone spring is at least partially fixed to the inside of the protective piece by stitching.

[0059] In one embodiment, the protective piece is filled with a buffer material.

[0060] In one embodiment, the positioning mechanism includes a protective piece fitted over the restraining band, the protective piece being made of a flexible rubber material.

[0061] In one embodiment, the restraining band includes a crotch belt, and the positioning mechanism is provided between the crotch belt and the seat portion. [Brief explanation of the drawings]

[0062] [Figure 1] 1 is a schematic diagram illustrating the configuration of a cart according to a first embodiment of the present invention. [Figure 2] FIG. 2 is an exploded perspective view of FIG. 1. [Figure 3] 3 is a schematic diagram illustrating the configuration of the armrest body and the armrest attachment unit shown in FIG. 2. FIG. [Figure 4] FIG. 4 is an exploded perspective view of a part of the armrest body and the armrest attachment unit shown in FIG. 3. [Figure 5] FIG. 5 is a schematic diagram illustrating the configuration of the engaging member shown in FIG. [Figure 6] 5 is a schematic diagram illustrating the configuration of the lock release member shown in FIG. 4. [Figure 7] 2 is a schematic diagram illustrating the configuration of an armrest body and an armrest attachment unit shown in FIG. 1. FIG. [Figure 8] 8 is a cross-sectional view taken along line AA in FIG. 7, where the locking mechanism set is in a locked state and the unlocking member includes two operating portions. [Figure 9] 8 is a cross-sectional view taken along the line BB in FIG. 7, in which the locking mechanism set is in a locked state and the unlocking member includes two operating portions. [Figure 10]8 is another cross-sectional view taken along line AA of FIG. 7, where the locking mechanism set is in an unlocked state and the unlocking member includes two operating portions. [Figure 11] 8 is another cross-sectional view taken along line BB of FIG. 7, in which the locking mechanism set is in an unlocked state and the unlocking member includes two operating portions. [Figure 12] 8 is another cross-sectional view taken along line AA in FIG. 7, where the locking mechanism set is in a locked state and the unlocking member includes one operating portion. [Figure 13] 8 is another cross-sectional view taken along line BB of FIG. 7, where the locking mechanism set is in an unlocked state and the unlocking member includes one operating portion. [Figure 14] 10 is yet another cross-sectional view of the armrest body and the armrest mounting unit taken along line AA, where the locking mechanism set is in a locked state, the unlocking member includes one operating portion, and the locking mechanism set includes an operating member. [Figure 15] 10 is yet another cross-sectional view of the armrest body and the armrest mounting unit taken along line AA, where the locking mechanism set is in an unlocked state, the unlocking member includes one operating portion, and the locking mechanism set includes an operating member. [Figure 16] 10 is a partial cross-sectional view of an armrest mounting unit for a cart according to a second embodiment of the present invention, with the locking mechanism set in a locked state. FIG. [Figure 17] FIG. 17 is a schematic diagram of the configuration when the locking mechanism set in FIG. 16 is in an unlocked state. [Figure 18] 10 is a partial cross-sectional view of an armrest mounting unit for a cart according to a third embodiment of the present invention, with the locking mechanism set in a locked state. FIG. [Figure 19] FIG. 19 is a schematic diagram illustrating the configuration of the locking mechanism set in FIG. 18 when it is in an unlocked state. [Figure 20] 1 is a partial schematic view of a seat assembly according to an embodiment of the present invention, with the locking fastener set in a locked state and the restraining band in a restrained position. [Figure 21]21 is another partial schematic view of the seat assembly shown in FIG. 20 with the locking fastener set in an unlocked state and the restraining band in an open position. [Figure 22] 10A and 10B are schematic diagrams illustrating the configuration of a protection piece and a positioning mechanism according to another embodiment. [Figure 23] 23A to 23C are schematic diagrams illustrating other examples of the shape of the protective piece and the flexible repulsive member shown in FIG. 22. [Figure 24] 23A and 23B are schematic diagrams illustrating examples of the configuration of the protective piece and the flexible repulsive member shown in FIG. 22 in other shapes. [Figure 25] 23 is a schematic diagram illustrating a configuration of still another example of the shape of the protective piece and the flexible repulsive member shown in FIG. 22. FIG. [Figure 26] 23 is another schematic diagram of the configuration of the protection piece and the positioning mechanism shown in FIG. 22. FIG. [Figure 27] 10 is a schematic diagram of the configuration of a protective piece and a positioning mechanism of a cart according to yet another embodiment, in which the flexible resilience member is a fishbone spring. [Figure 28] FIG. 28 is a schematic diagram of the structure after the fishbone-shaped spring portion in FIG. 27 has been pulled out from the protective piece. [Figure 29] 10A and 10B are schematic diagrams illustrating the configuration of a protection piece and a positioning mechanism according to another embodiment. [Figure 30] 10A and 10B are schematic diagrams illustrating the configuration of a protection piece and a positioning mechanism according to another embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0063] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only for interpreting the present invention and do not limit the protection scope of the present invention.

[0064] It should be noted that when an element is referred to as being "fixed" to another element, it may be directly located on the other element, or there may be intervening elements present. When an element is considered to be "connected" to another element, it may be directly connected to the other element, or there may also be intervening elements present. The terms "vertical," "horizontal," "left," "right," and similar terms used herein are for illustrative purposes only and do not refer to the only embodiment.

[0065] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art. The terms used herein are only for describing particular embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more associated items.

[0066] As shown in Fig. 1, one embodiment of the present invention provides a cart, such as a stroller or a care cart, which includes a frame 100, an armrest main body 200, and an armrest mounting unit 300. The armrest mounting unit 300 and the armrest main body 200 can be quickly attached to and detached from the frame 100, making it convenient to use.

[0067] Specifically, as shown in FIG. 1 , the frame 100 includes a seat assembly 110, a handle assembly 120, and an armrest support rod 130. The seat assembly 110 is used to seat a passenger and includes two opposing seat rods 111 and a seat portion 112 that covers the two seat rods 111 (see FIG. 20 ). The handle assembly 120 is connected to the seat assembly 110, making it convenient for a caregiver to push the cart forward. There are two armrest support rods 130, and first ends of the two armrest support rods 130 are connected to both sides of the handle assembly 120, respectively. There are also two corresponding armrest attachment units 300. The armrest main body 200 has a generally rod-like structure and is used to restrain the passenger to the seat assembly 110. Both ends of the armrest main body 200 are removably attached to the second ends of the two armrest support rods 130 by two armrest attachment units 300, respectively. Alternatively, an armrest mounting unit 300 may be provided on one side, and an armrest mounting unit 300 on the other side may be rotatably connected to the armrest support rod 130 .

[0068] 2 to 4, the armrest mounting unit 300 includes a fixed base 310 that can be locked or disengaged, a connecting base 320, a first magnetic attraction member 330, and a locking mechanism set 340. In this embodiment, the other ends of the two armrest support rods 130 are each provided with a fixed base 310, and both ends of the armrest main body 200 are each provided with a connecting base 320, and both ends of the armrest main body 200 respectively realize detachable connection with the two armrest support rods 130 by locking or disengaging the two connecting bases 320 and the two fixed bases 310. In another embodiment, the fixed bases 310 may be provided at both ends of the armrest main body 200, and the second of the two armrest support rods 130 may be provided with a connecting base 320.

[0069] Hereinafter, the structure and connection relationship will be specifically described using one armrest attachment unit 300 located at one end of the armrest main body 200 as an example.

[0070] Specifically, as shown in FIG. 4, the fixed base 310 has a generally columnar structure, with a portion of the outer wall of the fixed base 310 protruding to form a cylindrical first socket portion 311. The fixed base 310 is further provided with an annular engagement groove 312. In this embodiment, the engagement groove 312 is spaced apart from the first socket portion 311 and is located on the side of the first socket portion 311 farther from the armrest support rod 130. That is, in FIG. 4, the engagement groove 312 is located above the first socket portion 311. The portion of the tank wall farther from the engagement groove 312 than the first socket portion 311, i.e., the tank wall above the engagement groove 312, forms a position restriction boss 313. The first magnetic attraction member 330 is a permanent magnet and is provided inside the fixed base 310. In this embodiment, the south pole of the first magnetically attractive member 330 is farther from the armrest support rod 130 than the north pole of the first magnetically attractive member 330, i.e., the first magnetically attractive member 330 is installed with its south pole facing upward. In other embodiments, the opposite may be true, i.e., the first magnetically attractive member 330 may be installed with its north pole facing upward. In this embodiment, as shown in FIG. 8 , the fixing base 310 has a mounting cavity 314, and the first magnetically attractive member 330 is inserted into the mounting cavity 314. The mounting cover 350 is pressed against the bottom of the first magnetically attractive member 330 to prevent the first magnetically attractive member 330 from falling off.

[0071] 4, the connection base 320 includes a first cover 321 and a second cover 322 that are engaged with each other. A storage space 323 is formed between the first cover 321 and the second cover 322. Specifically, the first cover 321 may be provided with at least two elastic arms 3211, and the second cover 322 may be provided with at least two corresponding connection holes 3221, and the at least two elastic arms 3211 may be engaged with the at least two connection holes 3221 to achieve an engagement connection between the first cover 321 and the second cover 322. The reverse may also be true, i.e., the first cover 321 may be provided with connection holes 3221, and the second cover 322 may be provided with elastic arms 3211 that can engage with the connection holes 3221, and this is not limited to this embodiment. In this embodiment, the first cover 321 is located on the side of the second cover 322 farther from the armrest support rod 130; that is, the first cover 321 is located above the second cover 322. The second cover 322 has an insertion hole 3222 that can communicate with the storage space 323. When the connecting base 320 and the fixed base 310 are connected, the fixed base 310 is inserted into the storage space 323 through the insertion hole 3222 to form a magnetic interaction with the locking mechanism set 340. At the same time, the hole wall of the insertion hole 3222 forms a second socket portion 3223, which is fitted over the first socket portion 311 when the connecting base 320 and the fixed base 310 are connected (see FIG. 8 ). In this embodiment, the connecting base 320 is connected to one end of the armrest main body 200. In other embodiments, the connecting base 320 may be integrally molded with the armrest main body 200. In another embodiment, the first magnetic attraction member 330 may be provided on the connecting base 320 and the locking mechanism set 340 may be provided on the fixed base 310 .

[0072] Furthermore, at least a portion of the locking mechanism set 340 is provided in the storage space 323. The first magnetic attraction member 330 forms a magnetic interaction with the locking mechanism set 340, which can assist in positioning and separating the fixed base 310 and the connecting base 320. When the locking mechanism set 340 is in a locked state, the connecting base 320 can be fixed to the fixed base 310 by the locking mechanism set 340, and when the locking mechanism set 340 is in an unlocked state, the connecting base 320 can be separated from the fixed base 310.

[0073] Optionally, the locking mechanism set 340 may have multiple forms. For example, in a first embodiment, as shown in FIG. 4, the locking mechanism set 340 may include an engaging member 341, an unlocking member 342, a second magnetically attractive member 343, a rotating member 344, and a restoring member 345.

[0074] Specifically, as shown in FIG. 5, the engaging member 341 has a generally U-shaped structure and includes two opposing engaging arms 3411 and a fixing portion 3412 connected between the two engaging arms 3411. The fixing portion 3412 is fixed to the connecting base 320. Specifically, referring to FIG. 4, two fixing rings 3412a are provided at both ends of the fixing portion 3412, respectively. Two fixing posts 3224 are provided on the surface of the second cover 322 facing the storage space 323, and the two fixing rings 3412a may be fitted onto the two fixing posts 3224, respectively. This achieves a fixed connection between the fixing portion 3412 and the connecting base 320. The two engaging arms 3411 form a symmetrical arc-shaped sheet structure. Each engaging arm 3411 has an abutment 3413 on the surface farther from the second cover 322. In this embodiment, the abutting portion 3413 is provided at a portion of the engaging arm 3411 far from the fixed portion 3412, and the abutting portion 3413 has a generally columnar structure. Both of the two engaging arms 3411 are made of an elastically deformable material, such as plastic or steel. When not elastically deformed, the two engaging arms 3411 can engage with both sides of the annular engaging groove 312; that is, the two engaging arms 3411 are provided on both sides of the fixed base 310 so as to sandwich the fixed base 310 therebetween. When elastically deformed, the two engaging arms 3411 can deform in directions away from each other, and each disengage from the engaging groove 312.

[0075] 6 and 9, the unlocking members 342 are movably mounted on the connecting base 320, with at least a portion of the unlocking members 342 located within the storage space 323 and another portion of the unlocking members 342 located outside the storage space 323 for operation. The unlocking members 342 can be operated to move between a first locked position and a first unlocked position. When the unlocking members 342 are in the first locked position, the locking mechanism set 340 is in a locked state, and when the unlocking members 342 are in the first unlocked position, the locking mechanism set 340 is in an unlocked state.

[0076] Specifically, as shown in FIG. 6, the unlocking member 342 can include a push-up portion 3421, a connecting portion 3422, and an operating portion 3423.

[0077] As shown in Fig. 6, there are two push-up portions 3421, which are arranged opposite each other and connected to each other by a connecting portion 3422 to form a generally U-shaped structure. The opposing surfaces of the two push-up portions 3421 are both push-up slopes 3421a, and the two push-up slopes 3421a gradually approach each other in a direction away from the connecting portion 3422. In this embodiment, one of the push-up portions 3421 is provided with a serration portion 3421b. In other embodiments, both of the push-up portions 3421 may be provided with a serration portion 3421b.

[0078] 6, there are two operating parts 3423, which are fixed to the two push-up parts 3421 at the sides spaced apart from each other by two connecting rods 3424, respectively. The two operating parts 3423 may be in the form of push buttons, for example, and may extend outside the storage space 323 for operation. A user can simultaneously push the two operating parts 3423 to drive the movement of the unlocking member 342 between the first lock position and the first unlock position.

[0079] In another embodiment, as shown in FIGS. 12 and 13 , a single operating portion 3423 may be provided and connected to the connecting portion 3422. At least a portion of the operating portion 3423 extends outside the storage space 323 for operation. Alternatively, as shown in FIGS. 14 and 15 , the operating portion 3423 may be located within the storage space 323 and an operating member 360 may be provided that at least partially extends from the storage space 323. The operating member 360 is connected to or abuts the operating portion 3423 and is operable to drive the unlocking member 342 to move between the first lock position and the first unlock position via the operating portion 3423. Specifically, the operating member 360 may include a sliding portion 361 and a driving portion 362 that are connected to each other and angled from each other. The sliding portion 361 is located outside the storage space 323 and is slidable along the outer surface of the first cover 321. The slide portion 361 is provided with an operating protrusion 363 that is convenient for the user to operate. The first cover 321 is provided with an elongated hole 3214 that communicates with the storage space 323. One end of the drive unit 362, remote from the slide portion 361, is inserted into the storage space 323 through the elongated hole 3214 and abuts or is connected to the operating unit 3423. In this manner, pressing the operating protrusion 363 drives the unlocking member 342 to move between the first lock position and the first unlock position. In this embodiment, when the operating unit 3423 or the operating member 360 is pressed, the unlocking member 342 moves from the first lock position to the first unlock position.

[0080] 7 to 9, the second magnetically attractive member 343 is fitted within the rotating member 344, which is rotatably disposed within the receiving space 323. When the connecting base 320 is connected to the fixed base 310, the rotating member 344 is located above the first magnetically attractive member 330. In this embodiment, the second magnetically attractive member 343 is a permanent magnet. The second magnetically attractive member 343 has a first magnetic pole 3431 and a second magnetic pole 3432 at both ends. When the rotating member 344 is in the first rotation position, the first magnetic pole 3431 and the first magnetically attractive member 330 face each other and attract each other. When the rotating member 344 is in the second rotation position, the second magnetic pole 3432 and the first magnetically attractive member 330 face each other and repel each other. As described above, in this embodiment, the first magnetically attractive member 330 is provided with its south pole facing upward, so the first magnetic pole 3431 of the second magnetically attractive member 343 is an north pole and the second magnetic pole 3432 is an south pole. In another embodiment, when the first magnetically attractive member 330 is provided with its north pole facing upward, the first magnetic pole 3431 is an south pole and the second magnetic pole 3432 is an north pole.

[0081] Specifically, as shown in FIGS. 8 and 9, a connecting shaft 346 is provided in the storage space 323, and both ends of the connecting shaft 346 may be fixed to the first cover 321 or the second cover 322, respectively. The second magnetically attractive member 343 has a generally cylindrical structure, and the rotating member 344 has a generally cylindrical housing structure. The second magnetically attractive member 343 is bored into the connecting shaft 346 together with a roughly central portion of the rotating member 344, and is rotatable around the connecting shaft 346. The rotating member 344 has an annular outer wall, and a gear portion 349 is provided on the rotating member 344. The gear portion 349 protrudes from one surface of the rotating member 344, and the serration portion 3421b meshes with the gear portion 349. In this way, during the process of the unlocking member 342 moving between the first lock position and the second lock position, the engagement between the serration portion 3421b and the gear portion 349 can drive the rotation of the rotating member 344 between the first rotation position and the second rotation position.

[0082] Furthermore, a return member 345 is provided between the unlocking member 342 and the connecting base 320, and the return member 345 is adapted to bias the unlocking member 342 to move to the first lock position. In this embodiment, the return member 345 is a spring. Two return members 345 may be provided. Each of the two connecting rods 3424 may be provided with a first pressing protrusion 3424a, and each first pressing protrusion 3424a may be provided with a first fitting post 3424b. Two second pressing protrusions 3212 are provided correspondingly on the inner wall of the first cover 321, i.e., the surface of the first cover 321 facing the storage space 323, and each second pressing protrusion 3212 is provided with a second fitting post 3213. Both ends of each return member 345 are respectively fitted into the corresponding first fitting pillar 3424b and second fitting pillar 3213, and abut against the corresponding first pressing protrusion 3424a and second pressing protrusion 3212, thereby preventing the return member 345 from being displaced during deformation.

[0083] The specific working principle of the locking mechanism set 340 in this embodiment is as follows. 8 and 9, when it is necessary to remove the armrest main body 200 from the frame 100, by pushing the operating member 360 or the operating portion 3423, the unlocking member 342 is driven to move from the first locked position to the second unlocked position, that is, the unlocking member 342 is driven to move in the direction F1 in FIGS. 8 and 9, and at this time, the returning member 345 is compressed and deformed. In the process of the movement of the unlocking member 342, the two pushing-up portions 3421 of the unlocking member 342 push up the two engaging arms 3411 of the engaging member 341 in directions away from each other by means of the pushing-up slopes 3421a, and the two engaging arms 3411 are elastically deformed to disengage from the engaging grooves 312. 10 and 11, during the movement of the unlocking member 342, the serration portion 3421b and the gear portion 349 further mesh with each other, driving the moving member 348 together with the second magnetically attractive member 343 to rotate around the connecting shaft 346 in the direction F2 to the second rotation position, and the second magnetic pole 3432 faces the first magnetically attractive member 330. In this way, the two engaging arms 3411 are both disengaged from the engaging grooves 312, and the second magnetic pole 3432 and the first magnetically attractive member 330 face each other, generating a repulsive force. This allows the connecting base 320 to be quickly detached from the fixed base 310 without having to resist any additional locking force, which is convenient and simple. If the connecting base 320 has already been detached from the fixed base 310, removing the pushing force on the operating member 360 or the operating portion 3423 causes the unlocking member 342 to return from the first unlock position to the first lock position due to the action of the elastic return force of the return member 345, and the serration portion 3421b and the gear portion 349 of the unlocking member 342 engage with each other, driving the rotating member 344 to rotate together with the second magnetic attraction member 343 around the connecting axis 346 along the F2 direction to the first rotation position, i.e., the first magnetic pole 3431 is positioned below the second magnetic pole 3432.

[0084] When it is necessary to attach the armrest main body 200 to the frame 100, as shown in Figures 8 and 9, the connecting base 320 is pressed against the fixed base 310 to fit the second socket portion 3223 outside the first socket portion 311, and the fixed base 310 is inserted into the storage space 323 via the insertion hole 3222. At the same time, the two engaging arms 3411 of the engaging member 341 are elastically deformed to climb over the position restricting bosses 313 on the fixed base 310 and engage in the engaging grooves 312. The first magnetic pole 3431 of the second magnetic attraction member 343 is located below the second magnetic pole 3432, i.e., the first magnetic pole 3431 can generate an attractive force between the first magnetic attraction member 330 and the connecting base 320, so that the connecting base 320 and the fixed base 310 can be automatically positioned quickly and accurately, and the engaging member 341 can be quickly aligned with the fixed base 310 without requiring any extra calibration by humans, making the process of attaching the armrest body 200 to the frame 100 more convenient and simple.

[0085] Optionally, in the second embodiment, as shown in Figures 16 and 17, the locking mechanism set 340 can include an engaging member 341, an unlocking member 342, a second magnetically attractive member 343, a third magnetically attractive member 347, a moving member 348 and a returning member 345.

[0086] In this embodiment, as shown in FIGS. 16 and 17 , the structures and installation of the engagement member 341, the unlocking member 342, and the returning member 345 are substantially the same as those of the first embodiment, except that the push-up portion 3421 of the engagement member 341 does not have a serration portion 3421b. The rotating member 344 in which the second magnetically attractive member 343 is fitted in the first embodiment is replaced with a moving member 348 in which the second magnetically attractive member 343 and the third magnetically attractive member 347 are fitted. The moving member 348 may be fixedly connected to the unlocking member 342, or the moving member 348 may be integrally molded with the unlocking member 342. In this embodiment, the moving member 348 is fixedly connected to one end of the two push-up portions 3421, the end farther from the connecting portion 3422. In other embodiments, the moving member 348 may be fixedly connected to only one of the two push-up portions 3421. The second magnetic attraction member 343 and the third magnetic attraction member 347 are fitted into the moving member 348 with a gap therebetween, and the distance between the second magnetic attraction member 343 and the third magnetic attraction member 347 must be maintained so that their magnetic fields do not significantly affect each other. The moving member 348 has a first moving position and a second moving position.

[0087] Furthermore, as shown in Fig. 16, when the unlocking member 342 is in the first lock position, the moving member 348 is in the first movement position, and the second magnetically attractive member 343 faces the first magnetically attractive member 330, so that they can be attracted to each other. As shown in Fig. 17, when the unlocking member 342 is in the first unlock position, the moving member 348 is in the second movement position, and the third magnetically attractive member 347 faces the first magnetically attractive member 330, so that they can repel each other. Specifically, the second magnetically attractive member 343 is provided on the F1 side of the third magnetically attractive member 347. Both the second magnetically attractive member 343 and the third magnetically attractive member 347 are permanent magnets. As described above, the first magnetic attraction member 330 in this embodiment is provided with its south pole facing upward, so that the end of the second magnetic attraction member 343 closest to the fixed base 310 (i.e., the lower end of the second magnetic attraction member 343) is the north pole, and the end of the third magnetic attraction member 347 closest to the fixed base 310 (i.e., the lower end of the third magnetic attraction member 347) is the south pole. In this way, the second magnetic attraction member 343 and the first magnetic attraction member 330 can attract each other when facing each other, and the third magnetic attraction member 347 and the first magnetic attraction member 330 can repel each other when facing each other. In another embodiment, when the first magnetic attraction member 330 is installed with its north pole facing upward, the end of the second magnetic attraction member 343 closest to the fixed base 310 (i.e., the lower end of the second magnetic attraction member 343) is a south pole, and the end of the third magnetic attraction member 347 closest to the fixed base 310 (i.e., the lower end of the third magnetic attraction member 347) is a north pole. In another embodiment, the second magnetic attraction member 343 may be replaced with an iron block or other ferromagnetic material. In other words, it is sufficient that the second magnetic attraction member 343 and the first magnetic attraction member 330 can generate an attractive force to each other when facing each other.

[0088] The specific working principle of the locking mechanism set 340 in this embodiment is as follows. When it is necessary to remove the armrest main body 200 from the frame 100, as shown in Fig. 16, by pushing the operating member 360 or the operating portion 3423, the unlocking member 342 is driven to move from the first locked position to the first unlocked position, that is, the unlocking member 342 is driven to move in the direction F1 in Fig. 16, and at this time, the returning member 345 is compressed and deformed. In the process of the movement of the unlocking member 342, the two pushing-up portions 3421 of the unlocking member 342 push up the two abutment portions 3413 of the engaging member 341 in directions away from each other by means of the pushing-up slopes 3421a, and the two engaging arms 3411 are elastically deformed to disengage from the engaging grooves 312. At the same time, during the movement process, the unlocking member 342 further drives the moving member 348 to move to the second movement position against the attractive force between the second magnetic attraction member 343 and the first magnetic attraction member 330, and the third magnetic attraction member 347 and the first magnetic attraction member 330 face each other and generate a repulsive force. In this way, the two engaging arms 3411 are both disengaged from the engaging grooves 312, and the third magnetic attraction member 347 and the first magnetic attraction member 330 face each other and generate a repulsive force. This allows the connecting base 320 to be quickly detached from the fixed base 310 without having to resist any additional locking force, which is convenient and simple. If the connecting base 320 has already been detached from the fixed base 310, when the pushing force on the operating member 360 or the operating portion 3423 is removed, the unlocking member 342 returns from the first unlocking position to the first locking position due to the action of the elastic return force of the return member 345, and the unlocking member 342 drives the moving member 348 to return to the first moving position along the direction opposite to the F1 direction.

[0089] When the armrest main body 200 needs to be attached to the frame 100, the connecting base 320 is pressed against the fixed base 310 to fit the second socket portion 3223 onto the outside of the first socket portion 311, and the fixed base 310 is inserted into the receiving space 323 through the insertion hole 3222. At the same time, the two engaging arms 3411 of the engaging member 341 elastically deform to overcome the position restricting bosses 313 of the fixed base 310 and engage in the engaging grooves 312. At this time, the second magnetically attractive member 343 and the first magnetically attractive member 330 face each other and generate an attractive force to each other, so that the connecting base 320 and the fixed base 310 can be automatically positioned quickly and accurately, and the engaging member 341 can be quickly aligned with the fixed base 310 without requiring any additional manual calibration, making the process of attaching the armrest main body 200 to the frame 100 more convenient and simple.

[0090] Optionally, in the third embodiment, as shown in FIGS. 18 and 19, the locking mechanism set 340 can include an engaging member 341, an unlocking member 342, a second magnetically attractive member 343, a moving member 348 and a restoring member 345.

[0091] 18 and 19, the structures and installation of the engagement member 341, unlocking member 342, second magnetically attractive member 343, moving member 348, and returning member 345 in this embodiment are substantially the same as those in the second embodiment, except that the third magnetically attractive member 347 is not provided in this embodiment. Thus, when the unlocking member 342 is in the first lock position, the moving member 348 is in the first moving position, and the second magnetically attractive member 343 faces the first magnetically attractive member 330 and can be attracted to each other. When the unlocking member 342 is in the first unlock position, the moving member 348 is in the second moving position, and the second magnetically attractive member 343 is displaced from the first magnetically attractive member 330, and the mutual attraction force can be released.

[0092] The specific working principle of the locking mechanism set 340 in this embodiment is the same as that in the second embodiment, so it will not be repeated here.

[0093] 20 and 21, a seat assembly 110 includes a seat portion 112, a restraining band 400, a locking fastener set 500, and a positioning mechanism 600. The seat assembly 110 may be mounted on the base of a cart or a safety seat in an automobile. In this embodiment, the details of the restraining band 400, the locking fastener set 500, and the positioning mechanism 600 will be described using the seat assembly 110 mounted on a safety seat in an automobile as an example.

[0094] Restraint band 400 is provided on seat assembly 110 and has a restraining position and an open position. In this embodiment, restraint band 400 includes a crotch belt that is provided on seat portion 112 and correspondingly positioned between the thighs of the seated occupant. One end of restraint band 400 is fixed to seat portion 112, and the other end can be connected to one lock fastener of lock fastener set 500. When restraint band 400 is in the restraining position as shown in FIG. 20 , the occupant can be restrained in seat assembly 110. When restraint band 400 is in the open position as shown in FIG. 21 , the occupant can easily enter and exit seat assembly 110. In other embodiments, restraint band 400 can further include another band-like structure to restrict the movement of the occupant in the cart.

[0095] The locking fastener set 500 includes a locking fastener, which may be, for example, a pentagonal buckle, for connecting the restraint band 400 and another pair of waist bands 700 for restraining the waist of a seat occupant. The positioning mechanism 600 is provided between the restraint band 400 and the seat portion 112. When the locking fastener set 500 is in a locked state, the locking fastener set 500 can hold the restraint band 400 in a restrained position, and when the locking fastener set 500 is in an unlocked state, the positioning mechanism 600 can hold the restraint band 400 in an open position.

[0096] Optionally, the positioning mechanism 600 may have different configurations. For example, in one embodiment, as shown in FIGS. 20 and 21 , the positioning mechanism 600 includes a protective piece 630 fitted around the restraint band 400, a fourth magnetically attractive member 610 attached to the seat portion 112, and a fifth magnetically attractive member 620 attached to the restraint band 400 or the protective piece 630. One end of the restraint band 400 extends from the protective piece 630 and can be connected to one of the lock fasteners in the lock fastener set 500. The fourth magnetically attractive member 610 and the fifth magnetically attractive member 620 can attract each other to hold the restraint band 400 in the open position. Specifically, the fourth magnetically attractive member 610 is fixed to the seat portion 112 of the seat assembly 110 by, for example, sewing. In this embodiment, the seat portion 112 includes a seat cloth 1121 and a seat cushion 1122 attached to the seat cloth 1121. The fourth magnetic attraction member 610 may be provided on the seat cloth 1121 or on the seat cushion 1122.

[0097] Specifically, a perforation hole 1122a may be provided in the seat cushion 1122. Referring to Fig. 22, the protective piece 630 includes a first piece 631 and a second piece 632 connected to each other, the maximum width of the first piece 631 being greater than the diameter of the perforation hole 1122a, and the width of one end of the second piece 632 connected to the first piece 631 being equal to or less than the diameter of the perforation hole 1122a, and the protective piece 630 being perforated through the perforation hole 1122a. The one end of the first piece 631 farther from the second piece 632 can be positioned between the seat cloth 1121 and the seat cushion 1122 (i.e., positioned below the seat cushion 1122) via the perforation hole 1122a. An end of the second piece 632 farther from the first piece 631 passes through the seat cushion 1122 via the perforated hole 1122a and is located on the side of the seat cushion 1122 facing the seat cloth 1121, i.e., above the seat cushion 1122. If the side of the seat cushion 1122 facing the seat cloth 1121 is defined as the first side and the side of the seat cushion 1122 facing the seat cloth 1121 is defined as the second side, the first piece 631 is located on the first side of the seat cushion 1122, and the second piece 632 is located on the second side of the seat cushion 1122. In this embodiment, a perforated cover 634 is provided approximately in the center of the second piece 632, and the restraint band 400 is perforated between the second piece 632 and the perforated cover 634. Specifically, the perforated cover 634 is a substantially rectangular piece of cloth, and opposing sides of the rectangular piece of cloth are fixed to the second piece 632 by stitching (for example, machine sewing).

[0098] 20 and 21, when the locking fastener set 500 is switched from the locked state to the unlocked state, the restraint band 400 is switched from the restrained position to the released position, and the fifth magnetic attraction member 620 on the protective piece 630 and the fourth magnetic attraction member 610 on the seat cloth 1121 or the seat cushion 1122 are able to attract each other, thereby holding the restraint band 400 in the released position and avoiding the need to manually adjust the position of the restraint band 400 due to the displacement of the protective piece 630, making it easier for the baby to sit. The fourth magnetic attraction member 610 and the fifth magnetic attraction member 620 are both permanent magnets, and their magnetic poles need only be arranged so that the fourth magnetic attraction member 610 and the fifth magnetic attraction member 620 can attract each other when the restraint band 400 is in the released position. Alternatively, the fourth magnetic attraction member 610 and the fifth magnetic attraction member 620 may be configured such that one is a permanent magnet and the other is made of an iron block or other ferromagnetic material. In this embodiment, the fifth magnetic attraction member 620 is mounted on the protective piece 630, but this is not limited to this embodiment. If the positioning mechanism 600 does not have a protective piece 630, the fifth magnetic attraction member 620 may be mounted on the restraint band 400.

[0099] 22, the positioning mechanism 600 may further include a flexible rebound member 640 disposed within the protective piece 630. Optionally, the flexible rebound member 640 may be a thin sheet-like structure made of plastic, steel, metal, or other soft material with a certain degree of flexibility. The flexible rebound member 640 extends from the first piece 631 to the second piece 632, thereby ensuring the rebound force of the flexible rebound member 640. Specifically, the flexible rebound member 640 may include a first elastic portion 641 and a second elastic portion 642 connected to each other, where the first elastic portion 641 may be located within the first piece 631 and the second elastic portion 642 may be located within the second piece 632. That is, when the protection piece 630 is installed through the perforated hole 1122a on the seat cushion 1122, the first elastic part 641 of the flexible rebound member 640 is located on the first side of the seat cushion 1122 (i.e., below the seat cushion 1122) through the perforated hole 1122a, and the second elastic part 642 is located on the second side of the seat cushion 1122 (i.e., above the seat cushion 1122). In this embodiment, a buffer material is filled inside the protection piece 630, and the flexible rebound member 640 is located between the buffer material and the restraint band 400, thus preventing the flexible rebound member 640 from coming into contact with the baby and improving the riding comfort of the baby.

[0100] In this way, when the locking fastener set 500 is in the locked state and the restraining band 400 is in the restrained position, the flexible rebound member 640 within the protective piece 630 is allowed to bend. When the locking fastener set 500 is in the unlocked state, the flexible rebound member 640 can automatically return to a straight state under the action of its own elastic restoring force, thereby driving the restraining band 400 to automatically switch to the open position. In other words, the flexible rebound member 640 always moves the restraining band 400 to the open position.

[0101] Optionally, the flexible rebound member 640 may have a variety of shapes, such as a single elongated structure (as shown in FIG. 22), a U-shaped structure (as shown in FIG. 23), or two opposing elongated structures (as shown in FIG. 24). As shown in FIG. 25, the flexible rebound member 640 may further include a circular first elastic portion 641 and an elongated second elastic portion 642. The maximum width W2 of the second elastic portion 642 is smaller than the maximum width W1 of the first elastic portion 641. This configuration ensures a large elastic rebound force of the flexible rebound member 640.

[0102] 26, an opening 633 may be provided in the protective piece 630, and the flexible rebound member 640 can be removed from the protective piece 630 through the opening 633, thereby facilitating cleaning of the protective piece 630. Alternatively, a pocket may be sewn inside the protective piece 630, and the flexible rebound member 640 is removably inserted into the pocket, and the flexible rebound member 640 can be taken out of the pocket when cleaning of the protective piece 630 is required.

[0103] In some embodiments, as shown in FIGS. 27 and 28 , the flexible rebound member 640 may be a spring, such as a fishbone spring. The fishbone spring has a hollow structure and provides a strong rebound force, which facilitates the protection piece 630 and the restraint band 400 to quickly spring out when the locking mechanism set 340 is unlocked. In this embodiment, the fishbone spring is fixed to the protection piece 630 by stitching, for example, machine stitching, and the protection piece 630 may be filled with a cushioning material to prevent the fishbone spring from coming into contact with the baby and improve comfort. Optionally, the cushioning material may be a 20x foam, such as a common material such as EPS. In this embodiment, the fishbone spring extends from the first piece 631 to the second piece 632 to ensure a sufficient rebound force. In this embodiment, the fishbone spring is provided generally along the longitudinal central axis of the protective piece 630, but in other embodiments, the fishbone spring may be provided on the left or right side of the longitudinal central axis of the protective piece 630, or two fishbone springs may be provided spaced apart. Specifically, a long pocket for accommodating the fishbone spring may be sewn on the longitudinal central axis inside the protective piece.

[0104] In some embodiments, as shown in FIG. 29 , the positioning mechanism 600 simultaneously includes the fourth magnetic attraction member 610, the fifth magnetic attraction member 620, and the flexible repulsive member 640. When the lock fastener set 500 switches from the locked state to the unlocked state, the restraining band 400 can automatically switch from the locked position to the released position due to the elastic restoring force of the flexible repulsive member 640. The protective piece 630 and the seat portion 112 are then quickly fixed together by the attraction between the fourth magnetic attraction member 610 and the fifth magnetic attraction member 620, thereby holding the restraining band 400 in the released position. In this embodiment, the fifth magnetic attraction member 620 and the flexible repulsive member 640 may be spaced apart from the protective piece 630. In this way, the auxiliary positioning function of the fifth magnetic attraction member 620 allows the length of the flexible repulsive member 640 to be appropriately shortened, thereby saving material. In other embodiments, the fifth magnetic attraction member 620 may be provided on the perforated cover 634.

[0105] 30, if the flexible repulsive member 640 is made of a ferromagnetic metal material, it can be mutually attracted to the fourth magnetically attractive member 610. Therefore, the fifth magnetically attractive member 620 can be omitted and only the fourth magnetically attractive member 610 can be provided on the seat portion 112. In such an embodiment, care should be taken to ensure that the length L1 (see FIG. 30) of the second elastic portion 642 of the flexible repulsive member 640 is greater than the shortest length L2 (see FIG. 20) from the perforated hole 1122a to the fourth magnetically attractive member 610, so that the flexible repulsive member 640 can at least partially face and be attracted to the fourth magnetically attractive member 610 when the restraint band 400 is in the open position.

[0106] In some other embodiments, the protective piece 630 itself may be made of a flexible rubber material, and thus the protective piece 630 can have the effect of automatically repelling the restraint band 400 even without providing the flexible repulsive member 640 in the protective piece 630. Note that in some embodiments, the positioning mechanism 600 may include only the protective piece 630 and the flexible repulsive member 640 provided in the protective piece 630, but may not include the fourth magnetic attraction member 610 and the fifth magnetic attraction member 620.

[0107] The proposed armrest mounting unit 300 and cart of the present invention have at least the following technical effects. In the armrest mounting unit 300, the magnetic force (including attractive and / or repulsive forces) formed between the first magnetic attraction member 330 and the locking mechanism set 340 allows the locking mechanism set 340 to switch between a locked state in which the fixed base 310 is fixed to the connecting base 320 and an unlocked state in which the fixed base 310 is separated from the connecting base 320. When the fixed base 310 and the connecting base 320 are attached to, for example, the armrest main body 200 and the frame 100, respectively, quick attachment and detachment of the armrest main body 200 to and from the frame 100 can be realized, which is convenient to use.

[0108] The technical features of the above embodiments can be combined in any way, and for the sake of brevity, not all possible combinations of the technical features in the above embodiments are described, but as long as there is no contradiction in the combination of these technical features, it should be considered to be within the scope described in this specification.

[0109] The above examples merely illustrate some embodiments of the present invention, and the descriptions are relatively specific and detailed, but this should not be understood as limiting the scope of the claims. It should be noted that those skilled in the art can make some modifications and improvements without departing from the concept of the present invention, and all of these are within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be governed by the appended claims. [Explanation of symbols]

[0110] 100 frames 110 Seat Assembly 111 Seat rod 112 Seat section 1121 Seat cloth 1122 seat cushion 1122a Drilling hole 120 Handle assembly 130 Armrest support rod 200 Armrest body 300 Armrest Mounting Unit 310 Fixed stand 311 First socket part 312 Engagement groove 313 Position Control Boss 314 Mounting cavity 320 connection unit 321 First Lid 3211 Elastic Arm 3212 Second pressing protrusion 3213 Second interlocking column 3214 Long hole 322 Second lid 3221 Connection hole 3222 Insertion hole 3223 Second socket part 3224 Fixed column 323 Storage Space 330 First magnetic attraction member 340 Locking Mechanism Set 341 Engagement member 3411 Engagement arm 3412 Fixed part 3412a Retaining Ring 3413 Contact part 342 Unlocking member 3421 Push-up section 3421a Push-up slope 3421b Serration part 3422 Connection 3423 Operation unit 3424 Connecting Rod 3424a First pressing protrusion 3424b 1st mating column 343 Second magnetic attraction member 3431 1st magnetic pole 3432 2nd magnetic pole 344 Rotating Members 345 Returning member 346 Connecting shaft 347 Third magnetic attraction member 348 Moving parts 349 Gear section 350 Mounting cover 360 Operating member 361 Slide section 362 Drive Unit 363 Operation protrusion 400 Restraint Band 500 Locking Fastener Sets 600 Positioning mechanism 610 Fourth magnetic attraction member 620 Fifth magnetic attraction member 630 Protective piece 631 First half 632 Second half 633 Aperture 634 Perforated Cover 640 Flexible rebound member 641 First elastic part 642 Second elastic part 700 Waistband

Claims

1. The device includes a fixed base, a connecting base, a first magnetic attraction member, and a locking mechanism set; the first magnetic attraction member is fixed to one of the fixed base and the connecting base, the locking mechanism set is provided on the other of the connecting base and the fixed base, and when the locking mechanism set is in a locked state, the connecting base can be fixed to the fixed base by the locking mechanism set, and when the locking mechanism set is in an unlocked state, the connecting base can be separated from the fixed base; the first magnetic attraction member forms a magnetic force with the locking mechanism set, and can assist in positioning and separating the fixed base and the connecting base, the locking mechanism set includes a second magnetically attractive member; An armrest mounting unit characterized in that the second magnetic attraction member is movably arranged and can assist in positioning the fixed base and the connecting base by forming an attractive force with the first magnetic attraction member, and can assist in separating the fixed base and the connecting base by forming a repulsive force with the first magnetic attraction member.

2. the locking mechanism set is provided on the connecting base and further includes an unlocking member and an engaging member; the unlocking member is operable to move between a first locked position and a first unlocked position; The engaging member is provided on the connecting base, 2. The armrest attachment unit according to claim 1, wherein the second magnetic attraction member is movably mounted on the connecting base.

3. the locking mechanism set further includes a rotating member; the rotating member is rotatably mounted on the connecting base and has a first rotation position and a second rotation position, the second magnetic attraction member is mounted on the rotating member, and both ends of the second magnetic attraction member are a first magnetic pole and a second magnetic pole, respectively, when the rotating member is in the first rotation position, the first magnetic pole and the first magnetic attraction member face each other and attract each other, and when the rotating member is in the second rotation position, the second magnetic pole and the first magnetic attraction member face each other and repel each other, 3. The armrest mounting unit of claim 2, wherein when the unlocking member is in the first locking position, the unlocking member drives the rotating member to rotate to a first rotation position, and when the unlocking member is in the first unlocking position, the unlocking member drives the rotating member to rotate to a second rotation position.

4. a serration portion is provided on the unlocking member, a gear portion capable of meshing with the unlocking member is provided on the rotating member, and the unlocking member drives the rotation of the rotating member by the engagement of the serration portion with the gear portion; Alternatively, the armrest mounting unit of claim 3, characterized in that the unlocking member is movable between the first lock position and the first unlocked position, the unlocking member is provided with a serration portion that is arranged along the movement direction of the unlocking member, the rotating member is provided with a gear portion that can mesh with the unlocking member, the gear portion is arranged to protrude from the surface on one side of the rotating member, and the serration portion meshes with the gear portion.

5. 3. The armrest mounting unit of claim 2, wherein the locking mechanism set further includes a third magnetic attraction member, the second magnetic attraction member and the third magnetic attraction member are spaced apart and fixedly connected to the unlocking member, and when the unlocking member is in the first lock position, the second magnetic attraction member and the first magnetic attraction member face each other and can be attracted to each other, and when the unlocking member is in the first unlock position, the third magnetic attraction member and the first magnetic attraction member face each other and can repel each other.

6. The armrest mounting unit according to claim 5, characterized in that the locking mechanism set further includes a movable member, the second magnetic attraction member and the third magnetic attraction member are provided at an interval on the movable member, and the movable member is fixed to the unlocking member.

7. the engaging member has an abutment portion, the unlocking member has a push-up portion, and in the process of the unlocking member moving from the first lock position to the first unlock position, the push-up portion is capable of pushing up the abutment portion so as to release the engagement between the engaging member and the fixed base, Alternatively, the armrest mounting unit according to claim 2, characterized in that the engagement member has an engagement arm, the fixed base has an engagement groove, and when the unlocking member is in the first lock position, the engagement arm is engageable with the engagement groove, and when the unlocking member is in the first unlock position, the engagement arm is disengageable from the engagement groove.

8. 3. The armrest mounting unit according to claim 2, wherein the engaging member has an abutment portion, the unlocking member has a push-up portion, and in the process of the unlocking member moving from the first lock position to the first unlock position, the push-up portion is capable of pushing up the abutment portion so that the engaging member elastically deforms and releases engagement with the fixed base.

9. The armrest mounting unit of claim 8, characterized in that the engaging member has an engaging arm, the abutment portion is provided on the engaging arm, the fixed base has an engaging groove, and the push-up portion has a push-up slope, and in the process of the unlocking member moving from the first lock position to the first unlock position, the push-up slope is capable of pushing up the abutment portion so that the engaging arm elastically deforms in a direction away from the engagement groove.

10. The armrest mounting unit of claim 2, characterized in that the engaging member includes two opposing engaging arms and a fixed portion connected between the two engaging arms, the fixed portion being fixed to the connecting base, the fixed base having an annular engaging groove, the fixed base being positioned between the two engaging arms and having abutment portions on the two engaging arms, the unlocking member having two opposing push-up portions, when the unlocking member is in the first lock position, both of the two engaging arms engage with the engagement grooves, and in the process of the unlocking member moving from the first lock position to the first unlock position, the two push-up portions respectively push up the two abutment portions so that the two engaging arms elastically deform in directions away from each other until both of the engaging arms disengage from the engagement grooves.

11. the unlocking member further includes two operating units, the two operating units being fixedly connected to the two push-up units, respectively, and the two operating units being operable to drive the movements of the two push-up units; Alternatively, the unlocking member further includes an operating portion, the operating portion being connected to the two lifting portions, and the operating portion being operable to drive the movement of the two lifting portions. The armrest mounting unit according to claim 10,

12. 2. The armrest mounting unit according to claim 1, wherein the fixed base has a first socket portion, the connecting base has a second socket portion, and when the connecting base is engaged and locked with the fixed base, the second socket portion is fitted onto the first socket portion.

13. An armrest mounting unit according to any one of claims 1 to 12, A cart characterized in that the fixed base is provided on one of the frame and the armrest main body, the connecting base is provided on the other of the frame and the armrest main body, and the armrest main body is removably attached to the frame by the armrest mounting unit.

14. the frame includes a seat assembly, and the cart further includes a restraining band, a locking fastener set, and a positioning mechanism; the restraining band is mounted to the seat assembly and has a restraining position and a release position; the locking fastener set is connected to the restraining band and has a locked state and an unlocked state; the positioning mechanism is provided between the restraining band and the seat assembly; 14. The cart of claim 13, wherein when the locking fastener set is in a locked state, the locking fastener set is connected to the restraining band and capable of holding the restraining band in the restrained position, and when the locking fastener set is in an unlocked state, the positioning mechanism is capable of holding the restraining band in the released position.

15. 15. The cart of claim 14, wherein the positioning mechanism includes a fourth magnetically attractive member provided on the seat assembly and a fifth magnetically attractive member provided on the restraint band, the fourth magnetically attractive member and the fifth magnetically attractive member being capable of attracting each other to hold the restraint band in the open position.

16. The cart of claim 14, characterized in that the positioning mechanism further includes a protective piece fitted over the restraint band, a fourth magnetic attraction member provided on the seat assembly, and a fifth magnetic attraction member provided on the protective piece, and one end of the restraint band is extendable from the protective piece.

17. The cart of claim 14, wherein the positioning mechanism includes a protective piece fitted over the restraining band and a flexible rebound member provided within the protective piece, the flexible rebound member always moving the restraining band to the open position.

18. 18. The cart of claim 17, wherein the seat assembly includes a seat portion for carrying a passenger, the seat portion having a first side facing away from the passenger and a second side facing the passenger, the seat portion having a perforation hole, the protective piece including a first piece and a second piece connected to each other, the maximum width of the first piece being greater than the diameter of the perforation hole, the width of one end of the second piece connected to the first piece being less than the diameter of the perforation hole, the protective piece being perforated through the perforation hole, and the first piece being located on the first side of the seat portion, and the second piece being located on the second side of the seat portion.

19. The flexible resilient member is provided to extend from the first piece to the second piece, 19. The cart of claim 18, wherein the flexible rebound member has a first elastic portion and a second elastic portion connected to each other, the first elastic portion being located within the first piece, the second elastic portion being located within the second piece, and the maximum width of the first elastic portion being greater than the maximum width of the second elastic portion.

20. The cart of claim 17, characterized in that the protective piece has an opening and the flexible rebound member is removable from the protective piece through the opening, or the protective piece has a pocket and the flexible rebound member is removably inserted into the pocket.

21. 18. The cart according to claim 17, wherein the protective piece is filled with a buffer material, and the flexible rebound member is positioned between the buffer material and the restraining band.

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