CN215304491U

CN215304491U - Height-adjustable bed

Info

Publication number: CN215304491U
Application number: CN202120856455.9U
Authority: CN
Inventors: 刘伟; 刘赛
Original assignee: Goodbaby Child Products Co Ltd
Current assignee: Goodbaby Child Products Co Ltd
Priority date: 2021-04-25
Filing date: 2021-04-25
Publication date: 2021-12-28
Anticipated expiration: 2031-04-25

Abstract

The utility model discloses a height-adjustable bed which comprises an enclosing frame assembly, a chassis assembly and a supporting assembly supported between the enclosing frame assembly and the chassis assembly, wherein the supporting assembly comprises a first supporting rod and a second supporting rod which are arranged in parallel, the upper end part and the lower end part of the first supporting rod and the upper end part of the second supporting rod are respectively connected with the enclosing frame assembly and the chassis assembly in a rotating mode, the first supporting rod and the second supporting rod rotate relative to the enclosing frame assembly and the chassis assembly to enable the bed to be located at different height positions, the bed further comprises a one-way locking mechanism used for locking the bed at different height positions, and the one-way locking mechanism is arranged between the first supporting rod, the second supporting rod, the enclosing frame assembly and the chassis assembly which are connected in a random rotating mode. When the height of the bed is adjusted, the bed can be used as long as the first supporting rod and the second supporting rod rotate relative to the chassis assembly, and the unidirectional locking mechanism is unlocked without independent operation, so that the bed is convenient to use.

Description

Height-adjustable bed

Technical Field

The utility model relates to the technical field of children products, in particular to a height-adjustable bed.

Background

A child's bed is a common product for children. Because parents who take care of children have different heights, more and more cribs are added with a height adjusting function in order to be convenient for the parents to use. In order to enable the cot to be used stably at various height positions, it is necessary to lock the position of the cot at various heights by means of a locking mechanism. Among the prior art, locking mechanical system structure is complicated, and when the height of crib was adjusted to needs, need special operation to make the locking mechanical system unblock back, the height of crib just can be adjusted, the use of inconvenient crib.

SUMMERY OF THE UTILITY MODEL

The utility model aims to overcome the defects of the prior art and provide a bed with adjustable height and convenient height adjustment.

In order to achieve the purpose, the utility model adopts the technical scheme that:

a height adjustable bed comprises an enclosure frame assembly, a chassis assembly and a support assembly supported between the enclosure frame assembly and the chassis assembly, the supporting component comprises a first supporting rod and a second supporting rod which are arranged in parallel, the upper end parts of the first supporting rod and the second supporting rod are rotatably connected with the surrounding frame component, the lower ends of the first supporting rod and the second supporting rod are rotatably connected with the chassis component, the first supporting rod and the second supporting rod rotate relative to the surrounding frame assembly and the chassis assembly to enable the bed to be positioned at different height positions, the bed also comprises a one-way locking mechanism for locking the bed at different height positions, and the one-way locking mechanism is arranged between the first supporting rod, the second supporting rod, the enclosing frame assembly and the chassis assembly which are connected in a random rotating manner.

Preferably, the one-way locking mechanism includes a ratchet wheel fixedly disposed on the first support rod or the second support rod, a pawl rotatably disposed on the enclosure frame assembly or the chassis assembly and capable of cooperating with the ratchet wheel, and an elastic member for driving the pawl to rotate in a direction cooperating with the ratchet wheel, the one-way locking mechanism has a locked state and an unlocked state, when the one-way locking mechanism is in the locked state, the ratchet wheel cooperates with the pawl, the first support rod and the second support rod can only drive the ratchet wheel to rotate relative to the chassis assembly in the first direction, when the one-way locking mechanism is in the unlocked state, the ratchet wheel disengages from the pawl, and the first support rod and the second support rod can only drive the ratchet wheel to rotate relative to the chassis assembly in the second direction, the first direction is opposite to the second direction.

Furthermore, a plurality of tooth grooves are formed in the outer contour surface of the ratchet wheel, the tooth grooves are sequentially arranged in the circumferential direction of the rotation of the ratchet wheel, the pawl is provided with a latch which can be clamped into the tooth grooves in a matched mode, when the one-way locking mechanism is in a locking state, the latch is clamped into the tooth grooves, and when the one-way locking mechanism is in an unlocking state, the latch is disengaged from the tooth grooves.

Further, the one-way locking mechanism further comprises a cam for driving the one-way locking mechanism to be unlocked from a locked state, the cam is rotatably arranged on the enclosure frame assembly or the chassis assembly, and the cam can be matched with the pawl.

Furthermore, the cam is provided with a first limiting part, the ratchet wheel is provided with a first convex part, and when the ratchet wheel rotates relative to the chassis component in a first direction under the locking state of the one-way locking mechanism, the first convex part can be abutted against the first limiting part and enables the cam to rotate in the first direction to enable the pawl to rotate and disengage from the ratchet wheel.

Furthermore, the cam is further provided with a first matching portion, the pawl is provided with a second matching portion, when the one-way locking mechanism is in a locking state, the first matching portion is far away from the second matching portion, and when the cam rotates in the first direction to enable the first matching portion to be matched with the second matching portion, the one-way locking mechanism is in an unlocking state.

Furthermore, the cam is further provided with a second limiting part, the ratchet wheel is provided with a first convex part, and when the ratchet wheel rotates in a second direction relative to the chassis component in the unlocking state of the one-way locking mechanism, the second limiting part can abut against the first convex part and enables the cam to rotate in the second direction to enable the first matching part to be separated from the second matching part.

Furthermore, the one-way locking mechanism further comprises a limiting structure which is used for limiting the first supporting rod and the second supporting rod to drive the ratchet wheel to rotate relative to the chassis component in the first direction after the one-way locking mechanism is unlocked, the limiting structure comprises a second convex part fixedly arranged on the surrounding frame component or one of the chassis component and the ratchet wheel and a third limiting part arranged on the other component, when the one-way locking mechanism is in an unlocked state, the second convex part is abutted against the third limiting part, and the first supporting rod and the second supporting rod cannot drive the ratchet wheel to rotate relative to the chassis component in the first direction.

Preferably, the first support bar and the second support bar are both elastic.

Preferably, when the one-way locking mechanism is in a locked state, the bed can be sequentially adjusted in height from low to high, when the bed is at the highest position, the one-way locking mechanism is in an unlocked state, or when the one-way locking mechanism is in a locked state, the bed can be sequentially adjusted in height from high to low, and when the bed is at the lowest position, the one-way locking mechanism is in an unlocked state.

Due to the application of the technical scheme, compared with the prior art, the utility model has the following advantages: according to the height-adjustable bed, when the first support rod and the second support rod rotate relative to the surrounding frame assembly and the chassis assembly, the bed can be located at different height positions, and when the bed is located at different height positions, the positions of the first support rod or the second support rod are locked through the one-way locking mechanism, so that the bed can be stably used at different height positions, when the height of the bed is adjusted, the first support rod and the second support rod only need to rotate relative to the chassis assembly, the one-way locking mechanism does not need to be unlocked through independent operation, and the use of the bed is facilitated.

Drawings

FIG. 1 is a perspective view of a height adjustable bed of the present embodiment;

FIG. 2 is a front view schematically illustrating the height adjustable bed of the present embodiment;

FIG. 3 is a side view of the height adjustable bed of the present embodiment;

FIG. 4 is an enlarged view of a portion of FIG. 2 at A;

FIG. 5 is an exploded view of point A of FIG. 2;

FIG. 6 is a schematic structural view of a fixing base of the height adjustable bed of the present embodiment;

FIG. 7 is a schematic structural view of a second ratchet of the height adjustable bed of the present embodiment;

FIG. 8 is a schematic view of the height adjustable bed of the present embodiment in a first height position (in use, with the one-way locking mechanism in a locked state);

FIG. 9 is a cross-sectional view of the connection portion of the first support bar and the chassis assembly of FIG. 8;

FIG. 10 is a schematic view of the height adjustable bed of the present embodiment in a second height position (in use, with the one-way locking mechanism in a locked state);

FIG. 11 is a cross-sectional view of the connection of the first support bar to the chassis assembly of FIG. 10;

FIG. 12 is a schematic view of the height adjustable bed of the present embodiment in a third height position (in use, with the one-way locking mechanism in a locked position);

FIG. 13 is a cross-sectional view of the connection of the first support bar to the chassis assembly of FIG. 12;

FIG. 14 is a schematic view of the height adjustable bed of the present embodiment in a fourth height position (in use, with the one-way locking mechanism in a locked condition);

FIG. 15 is a cross-sectional view of the connection of the first support bar to the floor assembly of FIG. 14;

FIG. 16 is a schematic view of the height adjustable bed of the present embodiment in a fifth height position (during height adjustment, with the one-way locking mechanism in an unlocked state);

FIG. 17 is a cross-sectional view of the connection of the first support bar to the floor assembly of FIG. 16;

FIG. 18 is a schematic view of the height adjustable bed of the present embodiment in a sixth height position (during height adjustment, with the one-way locking mechanism in an unlocked state);

fig. 19 is a cross-sectional view of the connection of the first support strut to the floor pan assembly of fig. 18.

Wherein: 1. a frame enclosure assembly; 11. an upper surrounding frame rod; 12. a lower frame enclosing rod; 13. a connecting rod; 2. a chassis assembly; 21. a fixed seat; 211. a second convex portion; 3. a support assembly; 31. a first support bar; 32. a second support bar; 41. a ratchet wheel; 41a, a first ratchet wheel; 41b, a second ratchet wheel; 411. a tooth socket; 412. a first convex portion; 413. a third limiting part; 42. a pawl; 421. clamping teeth; 422. a second mating portion; 43. an elastic member; 5. a cam; 51. a first limiting part; 52. a second limiting part; 53. a pushing part; 54. a first mating portion.

Detailed Description

The technical solution of the present invention is further explained with reference to the drawings and the specific embodiments.

As shown in fig. 1 to 19, the height adjustable bed of the present invention includes a surrounding frame assembly 1, a base plate assembly 2, and a support assembly 3 supported between the surrounding frame assembly 1 and the base plate assembly 2.

The supporting component 3 comprises a first supporting rod 31 and a second supporting rod 32 which are arranged in parallel, the upper end parts of the first supporting rod 31 and the second supporting rod 32 are respectively connected with the surrounding frame component 1 in a rotating mode, and the lower end parts of the first supporting rod 31 and the second supporting rod 32 are respectively connected with the chassis component 2 in a rotating mode.

Therefore, a four-bar linkage mechanism is formed among the first supporting rod 31, the surrounding frame assembly 1, the second supporting rod 32 and the chassis assembly 2, when the first supporting rod 31 and the second supporting rod 32 rotate relative to the surrounding frame assembly 1 and the chassis assembly 2, the surrounding frame assembly 1 can be driven to move, an included angle between the surrounding frame assembly 1 and the horizontal plane is kept unchanged in the moving process, and the height is changed even if the bed is located at different height positions.

The bed also comprises a one-way locking mechanism used for locking the bed at different height positions, and the one-way locking mechanism is arranged between two parts which are arbitrarily connected in a rotating way in the four-bar linkage mechanism. In this embodiment, a one-way locking mechanism is provided between the first support strut 31 and the chassis assembly 2.

The one-way locking mechanism has a locked and unlocked state, and when the one-way locking mechanism is in the locked state, the first support bar 31 and the second support bar 32 can only rotate in the first direction relative to the base plate assembly 2 to adjust the height of the bed. When the one-way locking mechanism is in the unlocked state, the first support bar 31 and the second support bar 32 can only rotate relative to the chassis assembly 2 in a second direction, the first direction being opposite to the second direction. In this embodiment, the first direction is a counterclockwise direction, and the second direction is a clockwise direction.

The one-way locking mechanism includes a ratchet 41, a pawl 42, and an elastic member 43. The ratchet wheel 41 is fixedly arranged on the first support rod 31, and when the first support rod 31 rotates relative to the chassis component 2, the ratchet wheel 41 is driven to synchronously rotate relative to the chassis component 2. A pawl 42 is rotatably provided on the chassis assembly 2, the pawl 42 being engageable with the ratchet wheel 41. The elastic force of the elastic member 43 is used to drive the pawl 42 to rotate in the direction matching with the ratchet wheel 41, and the elastic member 43 is a torsion spring, and two ends of the torsion spring are respectively arranged on the pawl 42 and the chassis assembly 2.

When the one-way locking mechanism is in the locked state, the ratchet wheel 41 cooperates with the pawl 42 such that the ratchet wheel 41 is only able to rotate in a first direction relative to the chassis assembly 2. When the one-way locking mechanism is in the unlocked condition, the ratchet wheel 41 is disengaged from the pawl 42 and the ratchet wheel 41 is only able to rotate in the second direction relative to the chassis assembly 2.

The outer contour surface of the ratchet wheel 41 is provided with a plurality of tooth grooves 411, the tooth grooves 411 are sequentially arranged along the circumferential direction of rotation of the ratchet wheel 41, the direction of the notches of the tooth grooves 411 is opposite to the first direction, and the pawl 42 is provided with a latch 421 which can be fittingly latched into the tooth grooves 411. When the one-way locking mechanism is in a locked state, the latch 421 is latched into one of the tooth slots 411; when the one-way locking mechanism is in the unlocked state, the latch 421 is disengaged from all of the teeth slots 411.

In this embodiment, the ratchet wheel 41 includes a first ratchet wheel 41a and a second ratchet wheel 41b fixedly disposed on the first support rod 31 at intervals, both the first ratchet wheel 41a and the second ratchet wheel 41b are provided with tooth slots 411, and the positions of the tooth slots 411 on the first ratchet wheel 41a and the second ratchet wheel 41b correspond to each other. When the one-way locking mechanism is in the locked state, the latch 421 is simultaneously latched in the notches 411 of the first ratchet wheel 41a and the second ratchet wheel 41b, and when the one-way locking mechanism is in the unlocked state, the latch 421 is simultaneously disengaged from the notches 411 of the first ratchet wheel 41a and the second ratchet wheel 41 b.

The one-way locking mechanism further comprises a cam 5 for actuating the one-way locking mechanism to unlock from the locked state, the cam 5 being rotatably arranged on the chassis assembly 2.

The cam 5 can be engaged with the ratchet 41 so that when the ratchet 41 is rotated, the cam 5 can be driven to rotate by the ratchet 41.

Specifically, the cam 5 is provided with a first limiting portion 51 and a second limiting portion 52, and the ratchet wheel 41 is provided with a first protrusion 412, in this embodiment, the cam 5 is located between the first ratchet wheel 41a and the second ratchet wheel 41b, and the first protrusion 412 is located on the second ratchet wheel 41b, as shown in fig. 7.

When the one-way locking mechanism is in the locked state, the first limiting portion 51 is far away from the first protrusion 412, and when the first stay 31 drives the ratchet 41 to rotate in a first direction for a certain angle relative to the chassis assembly 2, the first limiting portion 51 and the first protrusion 412 are abutted, and at this time, the first stay 31 drives the ratchet 41 to rotate continuously in the first direction relative to the chassis assembly 2, and the cam 5 is driven to rotate in the first direction relative to the chassis assembly 2.

When the unidirectional locking mechanism is in the unlocked state, the first supporting rod 31 drives the ratchet 41 to rotate in the second direction for a certain angle synchronously relative to the chassis assembly 2, so that the second limiting portion 52 abuts against the first protruding portion 412, and at this time, the first supporting rod 31 drives the ratchet 41 to continue to rotate in the second direction relative to the chassis assembly 2, so as to drive the cam 5 to rotate in the second direction relative to the chassis assembly 2.

In this embodiment, the cam 5 is provided with a slot extending along the rotation direction thereof, the first limiting portion 51 and the second limiting portion 52 are two opposite side surfaces of the slot, respectively, and the first protrusion 412 is located in the slot, that is, located between the first limiting portion 51 and the second limiting portion 52.

The cam 5 can also cooperate with the pawl 42. Specifically, the cam 5 is further provided with an urging portion 53 and a first engagement portion 54, and the pawl 42 is provided with a second engagement portion 422.

When the cam 5 rotates in the first direction relative to the chassis assembly 2, the pushing portion 53 can be abutted against the pawl 42, so that when the cam 5 continues to rotate in the first direction relative to the chassis assembly 2, the pawl 42 can be driven to rotate relative to the chassis assembly 2, and the latch 421 of the pawl 42 can be disengaged from the slot 411 of the ratchet wheel 41, i.e. the one-way locking mechanism is unlocked.

When the one-way locking mechanism is in an unlocking state, the pushing part 53 is separated from the pawl 42, the first matching part 54 is matched with the second matching part 422 of the pawl 42, one of the first matching part 54 and the second matching part 422 is a limiting protrusion, the other one of the first matching part 54 and the second matching part 422 is a limiting groove, and when the limiting protrusion is matched with the limiting groove, the cam 5 and the pawl 42 are clamped with each other and then are fixed relatively, so that the one-way locking mechanism is kept in the unlocking state. In this embodiment, the first engagement portion 54 is a limit projection protruding outward from the outer contour surface of the cam 5, and the second engagement portion 422 is a limit groove recessed inward from the inner contour surface of the pawl 42.

When the cam 5 rotates in the second direction relative to the chassis assembly 2, the first engagement portion 54 is disengaged from the second engagement portion 422, and the pawl 42 rotates in the direction of engaging with the ratchet wheel 41 under the elastic force of the elastic member 43, so that the one-way locking mechanism is locked.

The one-way locking mechanism further comprises a limiting structure for limiting the first support rod 31 to drive the ratchet wheel 41 to rotate relative to the chassis assembly 2 in the first direction when the one-way locking mechanism is in the unlocked state. Specifically, the chassis component 2 is fixedly provided with the fixing seat 21, the limiting structure comprises a second convex portion 211 fixedly arranged on one of the fixing seat 21 and the ratchet wheel 41 and a third limiting portion 413 arranged on the other component, when the one-way locking mechanism is in an unlocking state, the second convex portion 211 abuts against the third limiting portion 413, and the first supporting rod 31 cannot drive the ratchet wheel 41 to rotate relative to the chassis component 2 in the first direction. In this embodiment, the second protrusion 211 is fixedly disposed on the fixing base 21, and the third position-limiting portion 413 is disposed on the first ratchet 41a, as shown in fig. 5 and 6.

The height adjustment process of the bed is as follows:

when the bed is in the first height position, in this embodiment the lowest height position, the one-way locking mechanism is in the locked state, the latch 421 on the pawl 42 is latched into the first slot 411 of the ratchet wheel 41, as shown in fig. 8 and 9, and the bed is in the stable use state, and a child can lie down in the enclosure frame assembly 1.

The first support rod 31 and the second support rod 32 rotate relative to the chassis component 2 in a first direction to drive the enclosure frame component 1 to move upwards, namely the height of the bed is raised, and the included angle between the enclosure frame component 1 and the horizontal plane is kept unchanged in the moving process; at the same time, when the first support rod 31 rotates in the first direction, the ratchet wheel 41 is driven to synchronously rotate relative to the chassis assembly 2 in the first direction, the ratchet teeth on the ratchet wheel 41 push away the latch teeth 421 of the pawl 42 to make the latch teeth 421 disengage from the current tooth socket 411, the pawl 42 then falls into the next tooth socket 411 under the action of the elastic member 43, so that the locking between the ratchet wheel 411 and the pawl 42 is performed again, and the bed is at the second height position, as shown in fig. 10 and 11. The bed is also in a stable use position, and a child can lie in the enclosure frame assembly 1.

As the first brace 31 and the second brace 32 are thus caused to continue to rotate relative to the chassis assembly 2 in the first direction, the same principle can be used to progressively raise the height of the adjustable bed to different height positions, for example to a third height position as shown in figures 12 and 13 and a fourth height position … … as shown in figures 14 and 15.

When the latch 421 on the pawl 42 is engaged in the last tooth slot 411 of the ratchet wheel 41 during height adjustment of the bed, as shown in fig. 14 and 15, when the first support rod 31 and the second support rod 32 are continuously rotated in the first direction relative to the chassis assembly 2, the first limiting portion 51 is abutted against the first protrusion 412, and at this time, when the first support rod 31 drives the ratchet wheel 41 to continuously rotate in the first direction relative to the chassis assembly 2, the cam 5 is driven to rotate in the first direction relative to the chassis assembly 2, so that the pushing portion 53 is abutted against the pawl 42, and when the first support rod 31 drives the ratchet wheel 41 and the cam 5 to continuously rotate in the first direction relative to the chassis assembly 2, the pawl 42 is driven to rotate relative to the chassis assembly 2, so that the latch 421 of the pawl 42 is disengaged from the last tooth slot 411 of the ratchet wheel 41, even if the one-way locking mechanism is unlocked, the bed moves to the highest position.

In the unlocked state of the one-way lock mechanism, the first engaging portion 54 and the second engaging portion 422 engage, so that both the cam 5 and the pawl 42 are relatively fixed, and the one-way lock mechanism is held in the unlocked state, as shown in fig. 16 and 17. In this state, since the second protrusion 211 and the third position-limiting portion 413 are abutted against each other, the first supporting rod 31 cannot drive the ratchet 41 to rotate relative to the chassis assembly 2 in the first direction.

The first stay 31 drives the ratchet wheel 41 to rotate relative to the chassis component 2 in the second direction, the height of the bed is gradually reduced, and at the same time, the second limiting portion 52 and the first protruding portion 412 are abutted, as shown in fig. 18 and 19, when the first stay 31 drives the ratchet wheel 41 to rotate relative to the chassis component 2 in the second direction, the cam 5 can be driven to rotate relative to the chassis component 2 in the second direction, so that the first matching portion 54 and the second matching portion 422 are disengaged, and at this time, the pawl 42 can rotate in the direction matching with the ratchet wheel 41 under the elastic force of the elastic member 43, so that the one-way locking mechanism is locked again, and when the one-way locking mechanism is locked again, the height of the bed is restored to the first height position again.

Of course, the bed may be at the highest position when the bed is at the first height position, and the first and

second struts

31 and 32 gradually decrease the height of the bed when they rotate relative to the chassis assembly 2 in the first direction, or the one-way locking mechanism may be unlocked when the bed moves to the lowest position.

The first support bar 31 and the second support bar 32 each have elasticity, and in the present embodiment, the first support bar 31 and the second support bar 32 are each made of spring steel. Like this, when children lie in enclosing frame subassembly 1, on enclosing frame subassembly 1 atress back transmission first bracing piece 31 and second bracing piece 32, first bracing piece 31 and second bracing piece 32 atress back production elastic deformation to the messenger encloses frame subassembly 1 and takes place to rock, makes this bed have the function of shaking table, improves travelling comfort and recreational when using.

Enclose frame subassembly 1 and include enclosing frame pole 11 on, be located and enclose frame pole 12 and the connecting rod 13 of setting between frame pole 11 and the lower frame pole 12 of enclosing under enclosing frame pole 11 on, the upper end of connecting rod 13 encloses frame pole 11 with last and rotates and be connected, and the lower tip of connecting rod 13 encloses frame pole 12 with down and rotates and be connected.

This bed can also be folded, and when the bed was folding, the altitude mixture control that makes the bed earlier reached minimum high position department, then the folding frame subassembly 1 that encloses makes connecting rod 13 enclose frame pole 12 relatively down and rotates thereby make on enclose frame pole 11 and enclose frame pole 12 down and draw close together can. The folded bed has compact structure, small volume and convenient carrying and storage.

The above embodiments are merely illustrative of the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.

Claims

1. A height adjustable bed comprising an enclosure frame assembly, a chassis assembly and a support assembly supported between the enclosure frame assembly and the chassis assembly, characterized in that: the supporting component comprises a first supporting rod and a second supporting rod which are arranged in parallel, the upper end of the first supporting rod and the upper end of the second supporting rod are connected with the enclosing frame component in a rotating mode, the lower end of the first supporting rod and the lower end of the second supporting rod are connected with the chassis component in a rotating mode, the first supporting rod and the second supporting rod are opposite, the enclosing frame component reaches the chassis component in a rotating mode, the bed is located at different height positions, the bed further comprises an one-way locking mechanism used for locking the bed at different height positions, and the one-way locking mechanism is arranged between the first supporting rod, the second supporting rod, the enclosing frame component and the chassis component in any rotating mode.

2. The height adjustable bed according to claim 1, wherein: the one-way locking mechanism comprises a ratchet wheel fixedly arranged on the first support rod or the second support rod, a pawl rotationally arranged on the enclosure frame assembly or the chassis assembly and matched with the ratchet wheel, and an elastic piece for driving the pawl to rotate in the direction matched with the ratchet wheel, the one-way locking mechanism has locking and unlocking states, when the one-way locking mechanism is in the locking state, the ratchet wheel is matched with the pawl, the first support rod and the second support rod can only drive the ratchet wheel to rotate relative to the chassis assembly in the first direction, when the one-way locking mechanism is in the unlocking state, the ratchet wheel is disengaged from the pawl, and the first support rod and the second support rod can only drive the ratchet wheel to rotate relative to the chassis assembly in the second direction, the first direction is opposite to the second direction.

3. The height adjustable bed of claim 2, wherein: the ratchet is characterized in that a plurality of tooth grooves are formed in the outer contour surface of the ratchet, the tooth grooves are sequentially arranged in the circumferential direction of the rotation of the ratchet, the pawl is provided with a clamping tooth which can be clamped into the tooth grooves in a matched mode, when the one-way locking mechanism is in a locking state, the clamping tooth is clamped into the tooth grooves, and when the one-way locking mechanism is in an unlocking state, the clamping tooth is disengaged from the tooth grooves.

4. The height adjustable bed of claim 2, wherein: the one-way locking mechanism further comprises a cam for driving the one-way locking mechanism to be unlocked from a locked state, the cam can be rotatably arranged on the surrounding frame assembly or the chassis assembly, and the cam can be matched with the pawl.

5. The height adjustable bed of claim 4, wherein: the cam is provided with a first limiting part, the ratchet wheel is provided with a first convex part, and when the ratchet wheel rotates in a first direction relative to the chassis component in a locking state of the one-way locking mechanism, the first convex part can be abutted against the first limiting part and enables the cam to rotate in the first direction to enable the pawl to rotate and disengage from the ratchet wheel.

6. The height adjustable bed of claim 4, wherein: the cam is further provided with a first matching portion, the pawl is provided with a second matching portion, when the one-way locking mechanism is in a locking state, the first matching portion is far away from the second matching portion, and when the cam rotates in a first direction to enable the first matching portion to be matched with the second matching portion, the one-way locking mechanism is in an unlocking state.

7. The height adjustable bed of claim 6, wherein: the cam is further provided with a second limiting part, the ratchet wheel is provided with a first convex part, and when the ratchet wheel rotates in a second direction relative to the chassis component in the unlocking state of the one-way locking mechanism, the second limiting part can abut against the first convex part and enables the cam to rotate in the second direction to enable the first matching part to be separated from the second matching part.

8. The height adjustable bed of claim 2, wherein: the one-way locking mechanism further comprises a limiting structure which is used for limiting the first supporting rod and the second supporting rod to drive the ratchet wheel to rotate relative to the chassis component in the first direction after the one-way locking mechanism is unlocked, the limiting structure comprises a second convex part and a third limiting part, the second convex part is fixedly arranged on the surrounding frame component or one of the chassis component and the ratchet wheel and the third limiting part is arranged on the other component, when the one-way locking mechanism is in an unlocking state, the second convex part is abutted to the third limiting part, and the first supporting rod and the second supporting rod cannot drive the ratchet wheel to rotate relative to the chassis component in the first direction.

9. The height adjustable bed according to claim 1, wherein: the first supporting rod and the second supporting rod are elastic.

10. The height adjustable bed according to claim 1, wherein: when the one-way locking mechanism is in a locking state, the height of the bed can be sequentially adjusted from low to high, when the bed is at the highest position, the one-way locking mechanism is in an unlocking state, or when the one-way locking mechanism is in a locking state, the height of the bed can be sequentially adjusted from high to low, and when the bed is at the lowest position, the one-way locking mechanism is in an unlocking state.