Patent Description:
Collapsible beds are widely used by virtue of portability and ease of storage. However, for portability, existing collapsible bed frames are generally of relatively lightweight material, sacrificing stability and resistance to damage by compression in the expanded state. Therefore, there is a need to improve on the existing construction.

Chinese utility module patent no. <CIT> discloses a multifunctional folding platform comprises a main platform unit. The main platform unit comprises two main table plates pivoted with each other, two main side plates and pivoted with the main table plates, and two main folding foot sets respectively pivoted to the main side plates. The two main folding foot sets are includes a number of main foot plates. The main side plates and the main foot plates are used to support the main table plates. Since there the main foot plates is formed with a unit thickness, the mechanical strength thereof is insufficient to stably support the main platform unit.

In order to resolve the described shortcomings, the present invention provides a multifunctional collapsible bed frame. The collapsible bed frame includes two side bed frames and a plurality of transverse boards spaced between the two side bed frames. Each side bed frame includes a plurality of collapsible units, hinged to the transverse boards through first hinge elements, and a second hinge element being disposed in a middle portion of each collapsible unit, so that the collapsible bed frame is transformable between an expanded state and a collapsed state. Each collapsible unit includes a first side plate and a second side plate, a front surface of the first side plate or the second side plate including at least a first region and a second region, and the first region protruding outward relative to the second region.

In an embodiment, the first region is a region of the first side plate or the second side plate that is close to two edges and/or a middle region of the first side plate or the second side plate.

In an embodiment, a front surface of each of the plurality of transverse boards includes at least a third region and a fourth region, the third region protruding outward relative to the fourth region.

In an embodiment, the plurality of transverse boards includes a middle transverse board, and each first hinge element includes a plurality of first connecting portions and a plurality of first mating portions. The plurality of first connecting portions are spaced on the middle transverse board, and the plurality of first mating portions are disposed on the first side plate of one of two adjacent collapsible units and the second side plate of the other of the two adjacent collapsible units. An insertable portion protrudes from at least one side of each first connecting portion in a first direction, and an insertion groove is recessed on each first mating portion for receiving the insertable portion, so as to hinge the middle transverse board to the side bed frame.

In an embodiment, the insertable portion is hemispherical, and the insertion groove includes a longitudinal groove and a circular groove, to facilitate disassembly and assembly of the collapsible bed frame.

In an embodiment, the plurality of transverse boards includes a transverse headboard, the transverse headboard being hinged to the first side plate or the second side plate through a third hinge element.

In an embodiment, the third hinge element includes a third connecting portion and a third mating portion, the third connecting portion being disposed on one of the transverse headboard and the first side plate or on one of the transverse headboard and the second side plate, the third mating portion being disposed on the other of the transverse headboard and the first side plate or on the other of the transverse headboard and the second side plate, and the third connecting portion being hinged to the third mating portion.

In an embodiment, a plurality of third connecting portions is spaced on the transverse headboard, and a plurality of third mating portions is spaced on the first side plate or the second side plate. A through hole is provided on at least one of the third connecting portions, and the through hole is used for receiving a support element.

The present invention further provides a multifunctional collapsible bed, including the collapsible bed frame as described, and a collapsible bed board, comprising a plurality of bed board units. A fourth hinge element is disposed in a middle portion of each bed board unit, and adjacent bed board units are hinged through a fifth hinge element, so that the collapsible bed board is transformable between an expanded state and a collapsed state, and the bed board units are disposed on the collapsible bed frame in the expanded state.

In an embodiment, each bed board unit includes a first bed board and a second bed board, and the fourth hinge element includes a connecting rod and a plurality of rotary portions. The plurality of rotary portions is sleeved on the connecting rod and respectively disposed on the first bed board and the second bed board, and the rotary portions on the first bed board are offset from the rotary portions on the second bed board.

In an embodiment, the collapsible bed further includes a support element. The support element includes a collapsible support rod and a fixing member, the support rod being fixed in a through hole of the transverse headboard. When the support rod is in an expanded state, the fixing member is disposed at an end of the support rod distal from the transverse headboard.

In an embodiment, the fixing member is made of an anti-slip material.

According to the collapsible bed provided in the present invention, the first region on the first side plate or the second side plate protrudes outward relative to the second region. In this way, the stability of the collapsible bed frame in the expanded state can be enhanced.

The technical solutions in the embodiments of this application are clearly and completely described below with reference to the accompanying drawings in the embodiments of this application. Apparently, the described embodiments are merely some rather than all of the embodiments of this application.

Unless otherwise defined, meanings of all technical and scientific terms used in this specification are the same as those usually understood by a person skilled in the art to which this application belongs. In this application, terms used in the specification of this application are merely intended to describe objectives of the specific embodiments, but are not intended to limit this application.

Some implementations of this application are described in detail below with reference to the accompanying drawings. The embodiments in the present disclosure and features in the embodiments may be mutually combined in case that no conflict occurs.

Referring to <FIG>, the present invention provides a multifunctional collapsible bed <NUM>. The collapsible bed <NUM> includes a collapsible bed frame <NUM> and a collapsible bed board <NUM>. The collapsible bed frame <NUM> and the collapsible bed board <NUM> are transformable between an expanded state and a collapsed state.

The collapsible bed frame <NUM> includes two side bed frames <NUM> disposed opposite to each other and a plurality of transverse boards <NUM>. The plurality of transverse boards <NUM> is spaced between the two side bed frames <NUM>.

Since the two side bed frames <NUM> have the same structure, only a detailed structure of one of the side bed frames <NUM> (also referred to as "side bed frame <NUM>") is described as follows.

Referring again to <FIG>, the side bed frame <NUM> includes a plurality of collapsible units <NUM>. The plurality of collapsible units <NUM> is hinged to the plurality of transverse boards <NUM> through first hinge elements <NUM>, and a second hinge element <NUM> is disposed in a middle portion of each of the plurality of collapsible units <NUM>, so that the collapsible bed frame <NUM> is transformable between the expanded state and the collapsed state. As shown in <FIG>, in the expanded state, the side bed frame <NUM> is flat, and the plurality of collapsible units <NUM> of one side bed frame <NUM> are on the same plane. As shown in <FIG>, each collapsible unit <NUM> includes a first side plate <NUM> and a second side plate <NUM>. In a partially-collapsed state, a first side plate <NUM> and a second side plate <NUM> of two adjacent collapsible units <NUM> of the side bed frame <NUM> on each side are retracted toward each other, so that the plurality of collapsible units <NUM> of the side bed frame <NUM> is collapsed into a "V" shape. As shown in <FIG>, in a collapsed state, the first side plates <NUM> and the second side plates <NUM> of the plurality of collapsible units <NUM> are overlapped to facilitate storage.

In this embodiment, a front surface of the first side plate <NUM> or/and the second side plate <NUM> includes at least a first region <NUM> and a second region <NUM>. The first region <NUM> protrudes outward relative to the second region <NUM>.

According to the invention, the first side plate <NUM> and the second side plate <NUM> include(s) a plurality of first regions <NUM>. The plurality of first regions <NUM> is respective regions of the first side plate <NUM> or the second side plate <NUM> that are close to two edges and/or substantially middle regions of the first side plate <NUM> or the second side plate <NUM>. As shown in <FIG>, <FIG> and <FIG>, according to the invention, the second region <NUM> has an outer surface <NUM> defined by a front surface of the first side plate <NUM> or/and the second side plate <NUM>. The first region <NUM>, according to the invention includes a plurality of hollow protrusions <NUM> which protrude outward from the outer surface <NUM>. The hollow protrusions <NUM> include a pair of edge protrusions 113a close to two edges of the first side plate <NUM> or the second side plate <NUM>, on the outer surface <NUM> thereof respectively, and middle protrusions 113b located between edge protrusions 113a, on the outer surface <NUM> of the first side plate <NUM> or the second side plate <NUM>. According to the invention, the edge protrusions 113a and the middle protrusions 113b are substantially elongated and orthogonal to each other.

It would be appreciated that, since the first region <NUM> on the first side plate <NUM> or/and the second side plate <NUM> protrudes outward relative to the second region <NUM> thereof, the first side plate <NUM> and the second side plate <NUM> on the same side are prevented from protruding away from the collapsible bed board when the collapsible bed is bearing weight. In this way, the stability of the collapsible bed frame <NUM> in the expanded state can be enhanced, while the collapsible bed frame <NUM> remains portable and easily stored.

Referring to <FIG> and <FIG>, in this embodiment, the plurality of transverse boards <NUM> includes a plurality of middle transverse boards <NUM>. Each first hinge element <NUM> includes a plurality of first connecting portions <NUM> and a plurality of first mating portions <NUM>. The plurality of first connecting portions <NUM> is spaced on the middle transverse boards <NUM>. The plurality of first mating portions <NUM> is spaced on each of the first side plate <NUM> and the second side plate <NUM> of the adjacent collapsible units <NUM>, and the first mating portions <NUM> on the first side plate <NUM> and the first mating portions <NUM> on the second side plate <NUM> are offset. Therefore, during assembly of the first side plate <NUM> and the second side plate <NUM>, the first mating portions <NUM> on the first side plate <NUM> and the first mating portions <NUM> on the second side plate <NUM> are staggered. A first insertable portion <NUM> protrudes from at least one side of each first connecting portion <NUM> along a height direction of the collapsible bed <NUM>, and a first insertion groove <NUM> is recessed on each first mating portion <NUM>. Through insertion of the first insertable portion <NUM> into the first insertion groove <NUM>, the middle transverse board <NUM> is moveably connected to the side bed frame <NUM>.

In this embodiment, the first insertable portion <NUM> is hemispherical, and the first insertion groove <NUM> includes a longitudinal groove <NUM> and a circular groove <NUM>. In this way, during assembly of the collapsible bed frame <NUM>, the first insertable portion <NUM> is first impelled along the longitudinal groove <NUM> and then into the circular groove <NUM>. When the collapsible bed frame <NUM> needs to be collapsed, action of the first insertable portion is reversed. As a result, expansion and collapse of the collapsible bed <NUM> can be realized. In addition, the first insertable portion <NUM> is rotatable in the circular groove <NUM>, so that the collapsible bed frame <NUM> can alternate between the expanded state and the collapsed state.

It would be appreciated that, when the collapsible bed frame <NUM> is collapsed, the first mating portions <NUM> on the first side plate <NUM> and the first mating portions <NUM> on the second side plate <NUM> are rotated in opposite directions.

In this embodiment, the first connecting portions <NUM> are integrally formed with the middle transverse boards <NUM>, and the first mating portions <NUM> are integrally formed with the first side plate <NUM> or the second side plate <NUM>. In other embodiments, the first connecting portions <NUM> may be fixed to the middle transverse boards <NUM>, and the first mating portions <NUM> may be fixed to the first side plate <NUM> or the second side plate <NUM> by means of welding, snap fitting, or the like and are not limited to the recited embodiment.

Further, referring to <FIG> and <FIG>, the second hinge element <NUM> includes a second connecting portion <NUM> and a second mating portion <NUM>. The second connecting portion <NUM> is disposed on one of the first side plate <NUM> and the second side plate <NUM>. The second mating portion <NUM> is disposed on the other of the first side plate <NUM> and the second side plate <NUM>. The second connecting portion <NUM> is mated with the second mating portion <NUM> to hinge the first side plate <NUM> to the second side plate <NUM>. In this embodiment, the second connecting portion <NUM> is disposed on the first side plate <NUM>, and the second mating portion <NUM> is disposed on the second side plate <NUM>. The second connecting portion <NUM> and the second mating portion <NUM> have the same structure as that of the first connecting portion <NUM> and the first mating portion <NUM> respectively, and thus details of the second connecting portion <NUM> and the second mating portion <NUM> are omitted. The first side plate <NUM> may be connected to the second side plate <NUM> through other hinge components, and should not be limited to the preceding embodiment.

Further, referring to <FIG> and <FIG>, the plurality of transverse boards <NUM> further includes two transverse headboards <NUM>. The two transverse headboards <NUM> are respectively disposed on two ends of the collapsible bed frame <NUM>. The plurality of middle transverse boards <NUM> is spaced between the two transverse headboards <NUM>. In this embodiment, there are two middle transverse boards <NUM>. In other embodiments, the quantity of middle transverse boards <NUM> may be adjusted as demanded and should not be limited to the preceding embodiment. The transverse headboards <NUM> are each hinged to the first side plate <NUM> or the second side plate <NUM> through a third hinge element <NUM>. Specifically, the third hinge element <NUM> includes a plurality of third connecting portions <NUM> and a plurality of third mating portions <NUM>. The third connecting portions <NUM> are disposed on one of the transverse headboard <NUM> and the first side plate <NUM>, or on one of the transverse headboard <NUM> and the second side plate <NUM>. The third mating portions <NUM> are disposed on the other of the transverse headboard <NUM> and the first side plate <NUM>, or on the other of the transverse headboard <NUM> and the second side plate <NUM>. In this embodiment, when a plurality of third connecting portions <NUM> is spaced on the transverse headboard <NUM>, a plurality of third mating portions <NUM> is spaced on the first side plate <NUM> or the second side plate <NUM>. The plurality of third connecting portions <NUM> and the plurality of third mating portions <NUM> have the same structure as that of the first connecting portion <NUM> and the first mating portion <NUM> respectively, and thus details of the third connecting portions <NUM> and the third mating portions <NUM> are omitted.

In this embodiment, similar to the first side plate <NUM> or the second side plate <NUM>, a front surface of each of the plurality of transverse boards <NUM> includes at least a third region <NUM> and a fourth region <NUM>. The third region <NUM> protrudes outward relative to the fourth region <NUM> to maintain stability of the collapsible bed <NUM> in the expanded state while keeping the collapsible bed <NUM> portable.

In this embodiment, the third region <NUM> is substantially elongated and is located on two sides or substantially located on the center of the transverse board <NUM>. However, it should not be limited to the preceding embodiment.

In this embodiment, at least one of the third connecting portions <NUM> further includes an extension portion <NUM>. A through hole <NUM> is provided on the extension portion <NUM>. The through hole <NUM> is used for insertion of a support element <NUM>.

In this embodiment, in the collapsible bed frame <NUM>, the thickness of the first region <NUM> on the first side plate <NUM> and the second side plate <NUM> is greater than the thickness of the second region <NUM> thereon. In this way, the stability of the collapsible bed frame <NUM> in the expanded state can be enhanced, while keeping the collapsible bed <NUM> portable.

In this embodiment, the collapsible bed frame <NUM> and the collapsible bed board <NUM> are made of lightweight materials such as plastic. In addition, a plurality of holes are provided on the collapsible bed frame <NUM> and the collapsible bed board <NUM>, so as to reduce the weight of the collapsible bed <NUM>.

Referring to <FIG>, <FIG>, and <FIG>, the collapsible bed board <NUM> comprises a plurality of bed board units <NUM>. Each bed board unit <NUM> includes a first bed board <NUM> and a second bed board <NUM>. As shown in <FIG>, in the expanded state, the plurality of bed board units <NUM> is disposed flat on the collapsible bed frame <NUM>. As shown in <FIG>, in the partially-collapsed state, the plurality of bed board units <NUM> are in a "V" shape. As shown in <FIG>, in the collapsed state, the first bed boards <NUM> and the second bed boards <NUM> of the plurality of bed board units <NUM> overlap.

Specifically, referring to <FIG>, the first bed board <NUM> is hinged to the second bed board <NUM> through a fourth hinge element <NUM>. The fourth hinge element <NUM> includes a plurality of rotary portions <NUM> and a connecting rod <NUM>. The plurality of rotary portions <NUM> is sleeved on the connecting rod <NUM>, and the plurality of rotary portions <NUM> is respectively disposed on the first bed board <NUM> and the second bed board <NUM>. It would be appreciated that the plurality of rotary portions <NUM> on the first bed board <NUM> and the plurality of rotary portions <NUM> on the second bed board <NUM> are alternately sleeved on the connecting rod <NUM>. The plurality of rotary portions <NUM> are rotatable about an axis of the connecting rod <NUM>, so as to facilitate the folding of the collapsible bed board <NUM>. An assembly hole <NUM> extending through each rotary portion <NUM> is provided on the rotary portion <NUM> for receiving the connecting rod <NUM>.

Further, referring to <FIG> and <FIG>, the fourth hinge element <NUM> further includes a first connecting member <NUM> and a second connecting member <NUM>. The first connecting member <NUM> and the second connecting member <NUM> are respectively disposed on two ends of the connecting rod <NUM>. An insertable portion <NUM> protrudes from the first connecting member <NUM>, and an insertion hole <NUM> is recessed on the second connecting member <NUM>, so as to assemble a plurality of collapsible beds <NUM> along a lateral axis of each collapsible bed <NUM> (as shown in <FIG>). It would be appreciated that the outer diameter of the insertable portion <NUM> matches the inner diameter of the insertion hole <NUM>, so as to firmly assemble the plurality of collapsible beds <NUM>. It would be appreciated that the disposal and arrangement of the first connecting member <NUM> and the second connecting member <NUM> should not be limited, as long as adjacent collapsible beds <NUM> can be expanded. In this embodiment, the material of the insertion hole <NUM> includes a soft material (such as rubber), and the material of the insertable portion <NUM> includes a rigid material (such as plastic). As a result, the insertion hole <NUM> can be easily mated with the insertable portion <NUM>, thereby making it easier to assemble the collapsible beds <NUM>. The mating between the insertion hole <NUM> and the insertable portion <NUM> may also be realized in other ways and should not be limited to the preceding embodiment.

Further, referring to <FIG> and <FIG>, the fourth hinge element <NUM> further includes a handle portion <NUM>. The handle portion <NUM> is sleeved on the approximate middle of the connecting rod <NUM>. An accommodating groove <NUM> is provided in the middle portion of one of the first bed board <NUM> and the second bed board <NUM>, and a receiving groove <NUM> is provided at a corresponding position of the other of the first bed board <NUM> and the second bed board <NUM>. The accommodating groove <NUM> and the receiving groove <NUM> are used for placing the handle portion <NUM> to provide enough space so that the handle portion <NUM> can be rotated about the connecting rod <NUM>. As shown in <FIG>, when the collapsible bed <NUM> is in the expanded state, the handle portion <NUM> is received in the accommodating groove <NUM> and the receiving groove <NUM>, and the handle portion <NUM> and the collapsible bed board <NUM> are commonly on the same plane. In addition, as shown in <FIG>, when the collapsible bed <NUM> is in the collapsed state, the handle portion <NUM> is received in the accommodating groove <NUM> and is on the same plane as the first bed board <NUM> or the second bed board <NUM>.

Further, referring to <FIG> and <FIG>, the bed board units <NUM> are hinged to each other through fifth hinge elements <NUM>. Specifically, a fifth hinge element <NUM> includes a plurality of fifth connecting portions <NUM> and a plurality of fifth mating portions <NUM>. The plurality of fifth connecting portions <NUM> is disposed on the first bed board <NUM> of one of adjacent bed board units <NUM> and on the second bed board <NUM> of the other of the adjacent bed board units <NUM>. The plurality of fifth mating portions <NUM> is spaced on the middle transverse board <NUM>. A fifth insertable portion <NUM> is formed on at least one side of each of the fifth connecting portions <NUM>. Two fifth insertion grooves <NUM> are recessed on both sides of each of the plurality of fifth mating portions <NUM> along a longitudinal axis of the collapsible bed <NUM>. The two fifth insertion grooves <NUM> are hinged to the fifth connecting portions <NUM> on the first bed board <NUM> and the second bed board <NUM> respectively, thereby connecting the bed board units <NUM> to the middle transverse board <NUM>. The fifth insertable portion <NUM> and the fifth insertion groove <NUM> have the same structure as that of the first insertable portion <NUM> and the first insertion groove <NUM> respectively, and thus details of the fifth insertable portion <NUM> and the fifth insertion groove <NUM> are omitted. The bed board units <NUM> may also be hinged to each other in other ways and should not be limited to the preceding embodiment.

Further, referring to <FIG> and <FIG>, the first bed board <NUM> and the second bed board <NUM> are hinged to the transverse headboard <NUM> through sixth hinge elements <NUM>. Specifically, a sixth hinge element <NUM> includes a plurality of sixth connecting portions <NUM> and a plurality of sixth mating portions <NUM>. The plurality of sixth connecting portions <NUM> are spaced on the transverse headboard <NUM>, and the plurality of sixth mating portions <NUM> are spaced on the first bed board <NUM> or on the second bed board <NUM>, so as to rotatably assemble the first bed board <NUM> or the second bed board <NUM> to the transverse headboard <NUM>. The plurality of sixth connecting portions <NUM> and the plurality of sixth mating portions <NUM> have the same structure as that of the first connecting portion <NUM> and the first mating portion <NUM> respectively, and thus details of the plurality of sixth connecting portions <NUM> and the plurality of sixth mating portions <NUM> are omitted. In other implementations, the first bed board and the second bed board may also be hinged to the transverse headboard through other hinge components which is not limited to the preceding embodiment.

Further, as shown in <FIG> and <FIG>, the collapsible bed <NUM> further includes a plurality of support elements <NUM>. The plurality of support elements <NUM> is respectively located at four corners of the collapsible bed <NUM> for supporting and fixing a mosquito net. Each support element <NUM> includes a collapsible support rod <NUM> and a fixing member <NUM>. Each of the support rods <NUM> is fixed in the through hole <NUM> of the transverse headboard <NUM>, and the fixing member <NUM> is disposed at an end of the support rod <NUM> distal from the transverse headboard <NUM>. In this embodiment, the fixing member <NUM> is made of an anti-slip material. It would be appreciated that, with the anti-slip material of the fixing member <NUM>, the mosquito net can be effectively prevented from slipping off during use.

In this embodiment, referring to <FIG> and <FIG>, the support rod <NUM> is transformable between an extended state and a collapsed state. The support rod <NUM> includes at least two rod bodies <NUM>, an elastic member <NUM>, and a connecting member <NUM>. The at least two rod main bodies <NUM> are fixedly connected to each other through the connecting member <NUM>, and the elastic member <NUM> is located within the rod main bodies <NUM>. When the support rod <NUM> needs to be extended, the at least two rod bodies <NUM> are pulled apart, and the two adjacent rod bodies <NUM> are respectively fixedly connected to the two ends of the connecting member <NUM>. When the support rod <NUM> needs to be collapsed, only one rod main body <NUM> of the support rod <NUM> needs to be disconnected from the connecting piece <NUM> and bent. The above structure is simple and is easily expanded. In this embodiment, the elastic member <NUM> is an elastic rope, and two ends of the elastic rope are respectively fixed to the two ends of the two rod bodies <NUM>.

Further, referring to <FIG> again, the collapsible bed frame <NUM> and the collapsible bed board <NUM> are detachably connected through a fixing element <NUM>. In this embodiment, the fixing element <NUM> includes a fixing portion <NUM> and a buckle portion <NUM>. The fixing portion <NUM> is disposed on the first side plate <NUM> or/and the second side plate <NUM>, and the buckle portion <NUM> is disposed on the first bed board <NUM> or the second bed board <NUM>. In this way, when the collapsible bed <NUM> is in the expanded state, the fixing portion <NUM> is snapped in the buckle portion <NUM> to fix the collapsible bed frame <NUM> with the collapsible bed board <NUM>.

During assembling of the collapsible bed <NUM>, the plurality of side plates, the plurality of transverse boards <NUM>, and the collapsible bed board <NUM> are expanded through various hinge elements. That is, each connecting portion is inserted into the corresponding circular groove by passing through the longitudinal groove, or the connecting portion is sleeved on the connecting rod. The structure of the collapsible bed <NUM> is simple, and after assembly, the collapsible bed <NUM> is ready to be used.

When the collapsible bed <NUM> needs to be collapsed, the collapsible units <NUM> of the two side bed frames <NUM> are collapsed. As shown in <FIG>, the first side plates <NUM> and the second side plates <NUM> of the two side bed frames <NUM> are moved toward each other, and the middle portions of the first bed boards <NUM> and the second bed boards <NUM> of the plurality of bed board units <NUM> are moved away from the collapsible bed frame <NUM> for further collapsing. As shown in <FIG>, the first bed boards <NUM> and the second bed boards <NUM> overlap, and the first side plates <NUM> and the second side plates <NUM> overlap. In this way, the collapsible bed <NUM> is easy to carry and store.

Compared with the prior art, in the collapsible bed frame <NUM> of the collapsible bed <NUM> provided in the present invention, due to the thickness of the first region <NUM> on the first side plate <NUM> and the second side plate <NUM> exceeding the thickness of the second region <NUM> thereof, the first side plate <NUM> and the second side plate <NUM> on the same side are prevented from bending away from the collapsible bed board when the collapsible bed is bearing weight. In this way, the stability of the collapsible bed frame <NUM> in the expanded state can be enhanced, and the collapsible bed <NUM> can be portable.

A compression resistance test was respectively performed on the side plate of Embodiment <NUM> of the present invention and a side plate of Comparative Example <NUM>. As shown in <FIG>, a total weight of <NUM> (i.e., F1 + F2) is applied to upper and lower sides of the side plate (i.e., the first side plate <NUM> or the second side plate <NUM>, which are cooperatively referred to as a side plate <NUM> below) of Embodiment <NUM>. Results obtained after analysis using a simulation calculation method (through computer aided engineering, CAE)) are shown in <FIG> and <FIG>.

A difference between the side plate <NUM> of Comparative Example <NUM> and the side plate <NUM> of Embodiment <NUM> resides in that the side plate <NUM> includes no first region and/or second region, that is, a front surface of the side plate <NUM> is a planar surface.

It may be learned from Table <NUM> that the maximum stress value of the side plate <NUM> of Comparative Example <NUM> is approximately twice the maximum stress value of the side plate <NUM> of Embodiment <NUM>, and the maximum deformation value of the side plate <NUM> of Comparative Example <NUM> is <NUM> times the maximum deformation value of the side plate <NUM> of Embodiment <NUM>. It may be learned that, compared with Comparative Example <NUM>, in Embodiment <NUM>, the maximum stress value and the maximum deformation value of the side plate <NUM> decrease, indicating that the compression resistance is effectively improved.

In the verification process, as shown in <FIG>, a three-point anti-bending table <NUM> was used to apply a total force of <NUM> to the left and right regions and the middle region of the side plate <NUM> of Embodiment <NUM>. A direction of the force F3 applied to the middle region is opposite to a direction of the force F4 applied to the left and right sides. Maximum stress values and maximum deformation values were obtained by analyzing changes of the side plate <NUM> after application of the force. The side plate <NUM> of Comparative Example <NUM> is tested in the same way. The results are shown in <FIG> and <FIG>.

It may be learned from Table <NUM> that the maximum stress values and the maximum deformation values of the two surfaces of the side plate <NUM> of Comparative Example <NUM> are both far greater than the maximum stress values and the maximum deformation values of the two surfaces of the side plate <NUM> of Embodiment <NUM>. It may be learned that, compared with Comparative Example <NUM>, in Embodiment <NUM>, the maximum stress values and the maximum deformation values decrease, indicating that the bending resistance is effectively improved.

As shown in <FIG>, a three-point anti-bending table <NUM> was used to apply a total force of <NUM> to the upper and lower sides and the middle of the side plate <NUM> of Embodiment <NUM>. Force F5 was applied to the middle region in a direction opposite to the force F6 applied to the upper and lower sides. The following maximum stress values and maximum deformation values were obtained by analyzing changes of the side plate <NUM> after application of the force. The side plate <NUM> of Comparative Example <NUM> was tested in the same way. The results are shown in <FIG>.

Claim 1:
A collapsible bed frame (<NUM>), comprising two side bed frames (<NUM>) and a plurality of transverse boards (<NUM>) spaced between the two side bed frames (<NUM>), each side bed frame (<NUM>) comprising a plurality of collapsible units (<NUM>), the collapsible units (<NUM>) being hinged to the transverse boards (<NUM>) through first hinge elements (<NUM>), and a second hinge element (<NUM>) being disposed in a middle portion of each collapsible unit (<NUM>), so that the collapsible bed frame (<NUM>) is transformable between an expanded state and a collapsed state, each collapsible unit (<NUM>) comprising a first side plate (<NUM>) and a second side plate (<NUM>), a front surface of the first side plate (<NUM>) or the second side plate (<NUM>) comprising at least a first region (<NUM>) and a second region (<NUM>), and the first region (<NUM>) protruding outward relative to the second region (<NUM>), wherein the second region (<NUM>) has an outer surface defined by a front surface of the first side plate (<NUM>) and the second side plate (<NUM>),
wherein the first region (<NUM>) includes a plurality of hollow protrusions, which protrude outward from the outer surface of the second region (<NUM>) and the hollow protrusions include a pair of edge protrusions (113a), close to two edges of the first side plate (<NUM>) or the second side plate (<NUM>), on the outer surface of the second region (<NUM>), and middle protrusions (113b) located between the edge protrusions (113a), on the outer surface of the second region (<NUM>), the edge protrusions (113a) and the middle protrusions (113b) are substantially elongated and orthogonal to each other.