BED

Abstract

A bed is provided, including a support stand, a cover, a cover support, and an adjustment mechanism. The cover support is connected at a top of the support stand, and the cover is connected on the cover support to form a bed surface. The adjustment mechanism is configured to adjust a tense degree of the bed surface. Optionally, the bed can be further provided with a retaining mechanism to prevent the movement of the mechanism. The arrangement of an adjustment mechanism allows the tense degree of a bed surface of the bed during use to be adjusted as needed and meanwhile makes it possible to facilitate product transport and simplify product installation.

Claims

1. Abed, comprising a support stand, a cover, a cover support, and an adjustment mechanism; wherein the cover support is connected at a top of the support stand, and the cover is connected on the cover support to form a bed surface; and the adjustment mechanism is configured to adjust a tense degree of the bed surface.

2. The bed according to claim 1, wherein the support stand comprises a plurality of support legs, and the cover support comprises a plurality of rods connected in sequence.

3. The bed according to claim 2, wherein a number of the plurality of support legs is four; and the plurality of rods comprises two traverse rods and two longitudinal rods connected in sequence to form a rectangular structure, the two traverse rods are arranged along a length direction of the rectangular structure, and the two longitudinal rods are arranged along a width direction of the rectangular structure.

4. The bed according to claim 3, wherein two ends of each of the two longitudinal rods are respectively mounted with a first connecting sleeve; the first connecting sleeve is fixedly provided with a second connecting sleeve and a third connecting sleeve; and the first connecting sleeve, the second connecting sleeve, and the third connecting sleeve constitute a three-way connecting configuration.

5. The bed according to claim 4, wherein the two traverse rods are inserted into the second connecting sleeves in a one-to-one correspondence, such that the two traverse rods and the two longitudinal rods are connected to form the cover support; the support legs are inserted into the third connecting sleeves in a one-to-one correspondence, such that the cover support is connected at the top of the support stand.

6. The bed according to claim 4, wherein the adjustment mechanism is configured to be mounted in the first connecting sleeve, and a number of the adjustment mechanism is less than or equal to a number of the first connecting sleeve.

7. The bed according to claim 6, wherein the adjustment mechanism is a screw bolt assembly; and the screw bolt assembly comprises a hollow screw with external threads and a head portion fixedly connected to one end of the hollow screw.

8. The bed according to claim 7, wherein each of the two longitudinal rods is configured to be inserted into the hollow screw and abut against the head portion, an inner wall of the first connecting sleeve is provided with internal threads, and the internal threads of the first connecting sleeve are configured to be engaged with the external threads of the hollow screw.

9. The bed according to claim 1, further comprising a retaining mechanism, wherein the retaining mechanism is configured to prevent a movement of the adjustment mechanism after an adjustment is completed.

10. The bed according to claim 9, wherein the retaining mechanism comprises a flip cover, a push rod, and a movable block; the flip cover is connected to the adjustment mechanism and configured as up-and-down overturn relative to the adjustment mechanism, the push rod is provided on the flip cover, and the movable block is rotatably provided on the adjustment mechanism.

11. The bed according to claim 6, wherein an inner wall of the first connecting sleeve is provided with a plurality of slots; the adjustment mechanism is a multi-gear adjustment assembly; and the multi-gear adjustment assembly comprises an adjustment bar and an adjustment cap fixedly connected to one end of the adjustment bar.

12. The bed according to claim 11, wherein the adjustment bar is provided with one or a plurality of limit blocks thereon; the adjustment cap is provided with a button thereon, and the button is configured to control the limit blocks to withdraw from or penetrate into the slots of the first connecting sleeve.

13. The bed according to claim 9, wherein the retaining mechanism comprises a threaded hole and a bolt; and after an adjustment is completed, the bolt is configured to be screwed into the threaded hole to abut against the adjustment mechanism.

14. The bed according to claim 9, wherein the retaining mechanism comprises a connecting base and a retaining ring rotatably connected to the connecting base; and after an adjustment is completed, the retaining ring is configured to be rotated to hook the adjustment mechanism.

15. The bed according to claim 3, wherein each of the two longitudinal rods comprises a plurality of rod segments, and each of the plurality of rod segments is provided with internal threads; and the adjustment mechanism is arranged between adjacent rod segments of the plurality of rod segments.

16. The bed according to claim 15, wherein the adjustment mechanism is a double-sided expansion assembly; and the double-sided expansion assembly comprises a rotating member and two adjustment bars mounted on two opposite sides of the rotating member, each of the two adjustment bars is provided with external threads engaged with the internal threads.

17. The bed according to claim 3, wherein each of the two longitudinal rods comprises a plurality of rod segments; and the adjustment mechanism is arranged between adjacent rod segments of the plurality of rod segments.

18. The bed according to claim 17, wherein the adjustment mechanism is a double-sided multi-gear adjustment assembly; and the double-sided multi-gear adjustment assembly comprises an adjustment center and two adjustment bars, first ends of the two adjustment bars are movably connected to two opposite sides of the adjustment center, second ends of the two adjustment bars are fixedly connected to the adjacent rod segments, each of the two adjustment bars is provided with a plurality of through holes thereon, the adjustment center is provided with a button on an outer wall thereof and a plurality of limit blocks on an inner wall thereof, the button is configured to control the limit blocks to withdraw from or penetrate into the through holes of the two adjustment bars, and the limit blocks are configured to be engaged with the through holes for limiting a movement of the two adjustment bars relative to the adjustment center.

19. The bed according to claim 1, wherein the cover support comprises two traverse rods arranged in a length direction of the bed in parallel; and the support stand comprises two rod assemblies arranged in a width direction of the bed in parallel, each of the two rod assemblies comprises two support legs and one longitudinal connecting rod, lower ends of the two support legs are symmetrically connected to two ends of the longitudinal connecting rod at an angle greater than 90, and upper ends of the two support legs are connected to bottoms of the two traverse rods, respectively.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0042] FIG. 1 is a perspective view of the bed according to Embodiment 1 with the cover in a slack state.

[0043] FIG. 2 is a cross-sectional view taken from line A-A of FIG. 1.

[0044] FIG. 3 is a perspective view of the bed according to Embodiment 1 with the cover in a tense state.

[0045] FIG. 4 is a cross-sectional view taken from line B-B of FIG. 3.

[0046] FIG. 5 is a schematic diagram showing the retaining mechanism according to Embodiment 1.

[0047] FIG. 6 is a cross-sectional view taken from line C-C of FIG. 5 with the flip cover being overturned upwards to open.

[0048] FIG. 7 is another cross-sectional view showing the retaining mechanism with the flip cover being overturned downwards to close.

[0049] FIG. 8A is a partially perspective view showing the adjustment mechanism according to Embodiment 2.

[0050] FIG. 8B is a cross-sectional view taken from line D-D of FIG. 8A.

[0051] FIG. 9 is a partially perspective view showing the retaining mechanism according to Embodiment 3.

[0052] FIG. 10 is a partially perspective view showing the retaining mechanism according to Embodiment 4 with the retaining ring in a free state.

[0053] FIG. 11 is a partially perspective view showing the retaining mechanism according to Embodiment 4 with the retaining ring in a hooking state.

[0054] FIG. 12 is a perspective view of the bed according to Embodiment 5 with the cover in a slack state.

[0055] FIG. 13 is a cross-sectional view taken from line E-E of FIG. 12.

[0056] FIG. 14 is a perspective view of the bed according to Embodiment 5 with the cover in a tense state.

[0057] FIG. 15 is a cross-sectional view taken from line F-F of FIG. 14.

[0058] FIG. 16 is a cross-sectional view showing the adjustment mechanism according to Embodiment 6.

[0059] FIG. 17 is a perspective view of the bed according to Embodiment 7 with the cover in a slack state.

[0060] FIG. 18 is a cross-sectional view taken from line G-G of FIG. 17.

[0061] FIG. 19 is a perspective view of the bed according to Embodiment 7 with the cover in a tense state.

[0062] FIG. 20 is a cross-sectional view taken from line H-H of FIG. 19.

[0063] FIG. 21 is a perspective view of the bed according to Embodiment 8.

[0064] FIG. 22 is a schematic diagram showing the retaining mechanism according to Embodiment 9.

[0065] FIG. 23 is a schematic diagram showing the retaining mechanism according to Embodiment 10.

[0066] FIG. 24 is a cross-sectional view taken from line I-I of FIG. 23.

[0067] FIG. 25 is a cross-sectional view showing the retaining mechanism according to Embodiment 10 in a locked state.

[0068] FIG. 26 is a perspective view of the bed according to Embodiment 11 with the cover in a slack state.

[0069] FIG. 27 is a perspective view of the bed according to Embodiment 11 with the cover in a tense state.

[0070] FIG. 28 is a schematic diagram showing the adjustment mechanism according to Embodiment 11.

[0071] FIG. 29 is a cross-sectional view showing the adjustment mechanism of FIG. 28 in a release state.

[0072] FIG. 30 is a cross-sectional view showing the adjustment mechanism of FIG. 28 in a stepping state.

[0073] FIG. 31 is a cross-sectional view showing the adjustment mechanism of FIG. 28 in a rollback state.

[0074] FIG. 32 is a cross-sectional view showing the adjustment mechanism of FIG. 28 in a locked state.

[0075] FIG. 33 is a perspective view of the bed according to Embodiment 12 with the cover in a slack state.

[0076] FIG. 34 is a cross-sectional view taken from line K-K of FIG. 33.

[0077] FIG. 35 is a perspective view of the bed according to Embodiment 11 with the cover in a tense state.

[0078] FIG. 36 is a cross-sectional view taken from line L-L of FIG. 35.

[0079] FIG. 37 is a perspective view of the bed according to Embodiment 13 with the cover in a slack state.

[0080] FIG. 38 is a cross-sectional view taken from line M-M of FIG. 37.

[0081] FIG. 39 is a perspective view of the bed according to Embodiment 13 with the cover in a tense state.

[0082] FIG. 40 is a cross-sectional view taken from line N-N of FIG. 39.

[0083] In the figures: [0084] 10. support stand, 11. support leg, 12. joint, 13. longitudinal connecting rod, 131. connecting rod segment, 20. cover, 30. cover support, 31. traverse rod, 32. longitudinal rod, 321. rod segment, 3211. internal thread, 41. first connecting sleeve, 410. threaded hole, 411. groove, 411. slot, 412. bolt, 413. internal thread, 414. mounting groove, 4141. step, 4142. limit convex, 415. rectangular groove, 42. second connecting sleeve, 43. third connecting sleeve, 51. screw bolt assembly, 511. hollow screw, 5110. limit groove, 5111. external thread, 512. head portion, 51. multi-gear adjustment assembly, 511. adjustment bar, 512. adjustment cap, 5111. limit block, 5121. button, 52. double-sided expansion assembly, 521. rotating member, 522. adjustment bar, 5221. external thread, 52. double-sided multi-gear adjustment assembly, 521. adjustment bar, 5211. through hole, 522. adjustment center, 5221. button, 5222. limit block, 61. flip cover, 62. push rod, 63. movable block, 64. retaining ring, 65. connecting base, 66. push switch, 661. recess, 662. limit concave, 71. mounting base, 72. handle, 721. rotating shaft, 73. movable sleeve, 731. ratchet, 74. first detent, 75. second detent, 81. column, 82. rope.

DETAILED DESCRIPTION OF THE EMBODIMENTS

[0085] The present disclosure will be described in detailed below in conjunction with the accompanying drawings and the following specific embodiments.

Embodiment 1

[0086] A bed, referring to FIG. 1, includes the support stand 10, the cover 20, the cover support 30, and an adjustment mechanism. The cover support 30 is connected at the top of the support stand 10, and the cover 20 is connected on the cover support 30 to form a bed surface.

[0087] Preferably, the cover 20 is made of a flexible material, such as oxford fabric cloth, sail cloth, or cotton linen fabric.

[0088] The support stand 10 includes a plurality of support legs 11, and the cover support 30 includes a plurality of rods connected in sequence. In the present embodiment, referring to FIG. 1 to FIG. 4, the support stand 10 includes four support legs 11, and the cover support 30 includes two traverse rods 31 and two longitudinal rods 32 connected in sequence to form a rectangular structure. The two traverse rods 31 are arranged along the length direction of the rectangular structure, and the two longitudinal rods 32 are arranged along the width direction of the rectangular structure. The length of the traverse rod 31 and the length of the longitudinal rod 32 can be the same or different.

[0089] Two ends of each longitudinal rod 32 are respectively mounted with the first connecting sleeve 41, and the first connecting sleeve 41 is fixedly provided with the second connecting sleeve 42 and the third connecting sleeve 43. The first connecting sleeve 41, the second connecting sleeve 42, and the third connecting sleeve 43 constitute a three-way connecting configuration. The traverse rods 31 are inserted into the second connecting sleeves 42 in a one-to-one correspondence so that the two traverse rods 31 and the two longitudinal rods 32 are connected to form the cover support 30. The support legs 11 are inserted into the third connecting sleeves 43 in a one-to-one correspondence so that the cover support 30 is connected at the top of the support stand 10.

[0090] The adjustment mechanism can be mounted in the first connecting sleeve 41. The number of the adjustment mechanism can be less than or equal to the number of the first connecting sleeve 41. In the present embodiment, two adjustment mechanisms are used and mounted in two first connecting sleeves 41 at two ends of the same traverse rod 31, respectively. Each of the two adjustment mechanisms is the screw bolt assembly 51. Referring to FIG. 2 and FIG. 4, the screw bolt assembly 51 includes the hollow screw 511 with external threads 5111 and the head portion 512 fixedly connected to one end of the hollow screw 511. The longitudinal rod 32 is inserted into the hollow screw 511 and abuts against the head portion 512. The inner wall of the first connecting sleeve 41 is provided with internal threads 413. When the cover 20 deforms and appears slack, the screw bolt assembly 51 can be rotated to enable the hollow screw 511 to move toward and be spirally screwed into the first connecting sleeve 41 due to the engagement of the internal threads of the first connecting sleeve 41 and the external threads of the hollow screw 511, which thereby pushes the longitudinal rod 32 to move out of the first connecting sleeve 41 and increases the distance between the two traverse rods 31, thus making the slack cover 20 return to tense state.

[0091] The arrangement of the adjustment mechanism allows an easy adjustment between slack and tense states of the cover 20. When the cover 20 deforms and becomes slack after long-term use, there is no need to replace the cover 20 but only to adjust it back to tense state for normal use, thus significantly reducing manual effort and greatly prolonging the service life of the bed. In addition, when designing the size of the support legs 11 and the cover support rods 31/32, a certain space for easy installation can be left without worrying about the situation that imprecise structure size may lead to slack bed surface because the adjustment mechanism can remedy this possible deficiency.

[0092] It should be noted that the adjustment mechanism is not limited to the screw bolt assembly 51 described above, any similar structure that can increase the distance between the two traverse rods 31 to make the cover 20 be in the tense state is suitable.

[0093] After the adjustment of the cover 20 is completed, the tense state of the cover 20 must be maintained to keep the bed stable during use. Therefore, it is necessary to prevent the screw bolt assembly 51 from further movement. A retaining mechanism is further provided to prevent the screw bolt assembly 51 from further movement after the adjustment is completed.

[0094] Referring to FIG. 5 to FIG. 7, the retaining mechanism of the present embodiment includes the flip cover 61, the push rod 62, and the movable block 63. The flip cover 61 is connected to the head portion 512 and configured as up-and-down overturn relative to the head portion 512. The push rod 62 is provided on the flip cover 61, and the movable block 63 is provided at the connecting portion between the hollow screw 511 and the head portion 512. The inner wall of the first connecting sleeve 41 is provided with the groove 411 at the end close to the screw bolt assembly 51. When the cover 20 needs adjustment, the flip cover 61 is overturned upwards to open so that the movable block 63 is aligned with the hollow screw 511, the screw bolt assembly 51 is rotated to allow the hollow screw 511 to be spirally screwed into the first connecting sleeve 41. After the cover 20 is adjusted to the tense state, the flip cover 61 is overturned downwards by 180 to close so that the push rod 62 rotates upwards to push the movable block 63 into the groove 411 to stop the screw bolt assembly 51.

Embodiment 2

[0095] The present embodiment is basically the same as Embodiment 1 except for the following: [0096] 1. In the present embodiment, the multi-gear adjustment assembly 51 is used instead of the screw bolt assembly 51 as the adjustment mechanism. Referring to FIGS. 8A-8B, the multi-gear adjustment assembly 51 includes the adjustment bar 511 and the adjustment cap 512 fixedly connected to one end of the adjustment bar 511, the adjustment bar 511 is provided with one or a plurality of limit blocks 5111 thereon, and the adjustment cap 512 is provided with the button 5121 thereon. [0097] 2. In the present embodiment, the internal threads 413 and the groove 411 provided on the inner wall of the first connecting sleeve 41 are eliminated, instead, a plurality of slots 411 matching with the limit blocks 5111 are provided. The button 5121 is configured to control the limit blocks 5111 to withdraw from or penetrate into the slots of the first connecting sleeve 41.

[0098] When the cover 20 deforms and becomes slack, a user can press the button 5121 to retract the limit blocks 5111 into the adjustment bar 511 and move the multi-gear adjustment assembly 51 into the first connecting sleeve 41 to push the longitudinal rod 32 out of the first connecting sleeve 41, so that the distance between the two traverse rods 31 is increased to make the cover 20 return to the tense state. After the adjustment is completed, the button 5121 is released to allow the limit blocks 5111 to protrude out of the adjustment bar 511 and engage into the slots 411. Since a plurality of slots 411 are arranged, the limit block(s) 5111 and the slots 411 form a multi-gear adjustment configuration and the cover 20 can be adjusted as needed. Furthermore, the engagement of the limit block(s) 5111 and the slots 411 inherently results in a stable limit, thus the retaining assembly of Embodiment 1 can be optionally eliminated.

Embodiment 3

[0099] The present embodiment is basically the same as Embodiment 1 except for the structure of the retaining mechanism. The retaining mechanism of the present embodiment is implemented as follows. Referring to FIG. 9, the retaining mechanism includes the threaded hole 410 and the bolt 412. The outer wall of the first connecting sleeve 41 is provided with the threaded hole 410, and the bolt 412 is in a threaded connection with the threaded hole 410. When the adjustment is completed, the bolt 412 is screwed into the threaded hole 410 to abut against the screw bolt assembly 51, so that the screw bolt assembly 51 is prevented from further movement.

Embodiment 4

[0100] The present embodiment is basically the same as Embodiment 1 except for the structure of the retaining mechanism. The retaining mechanism of the present embodiment is implemented as follows. Referring to FIG. 10 and FIG. 11, the retaining mechanism includes the retaining ring 64 and the connecting base 65. The outer wall of the first connecting sleeve 41 is provided with the connecting base 65, and the retaining ring 64 is rotatably connected to the first connecting sleeve 41 through the connecting base 65. When the adjustment is completed, the retaining ring 64 is rotated to hook the head portion 512, so that the screw bolt assembly 51 is prevented from further movement.

Embodiment 5

[0101] On the basis of any of Embodiments 1 and 3-4 above, the present embodiment has the following differences: [0102] 1. The longitudinal rods 32 each include a plurality of rod segments 321. In the present embodiment, two rod segments 321 are used to form the longitudinal rod 32. Each rod segment 321 is provided with the internal threads 3211. [0103] 2. The adjustment mechanism is arranged between adjacent rod segments 321. The adjustment mechanism is the double-sided expansion assembly 52.

[0104] Specifically, referring to FIG. 12 to FIG. 15, in the present embodiment, the inner wall of each rod segment 321 is provided with the internal threads 3211, and the directions of the internal threads 3211 of the adjacent two rod segments 321 are opposite. The double-sided expansion assembly 52 includes the rotating member 521 and two adjustment bars 522 mounted on two opposite sides of the rotating member 521. Each adjustment bar 522 is provided with external threads 5221 engaged with the internal threads 3211 of the rod segment 321. When the cover 20 deforms and becomes slack, the rotating member 521 is rotated to push out the two adjustment bars 522, which thereby drives the two rod segments 321 to move opposite to each other, so that the distance between the traverse rods 31 is increased to make the cover 20 return to the tense state.

Embodiment 6

[0105] The present embodiment is basically the same as Embodiment 5 except for the following:

[0106] The double-sided expansion assembly 52 in Embodiment 5 is replaced by the double-sided multi-gear adjustment assembly 52. Specifically, referring to FIG. 16, the double-sided multi-gear adjustment assembly 52 includes the adjustment center 522 and two adjustment bars 521 with one ends movably connected to two opposite sides of the adjustment center 522, the other ends of the adjustment bars 521 are fixedly connected to the two rod segments 321. Each of the two adjustment bars 521 is provided with a plurality of through holes 5211 thereon, and the adjustment center 522 is provided with the button 5221 on the outer wall thereof and a plurality of limit blocks 5222 on the inner wall thereof. The button 5221 is configured to control the limit blocks 5222 to withdraw from or penetrate into the through holes 5211 on the adjustment bars 521. The engagement between the limit blocks 5222 and the through holes 5211 is configured for limiting the further movement of the adjustment bars 521 relative to the adjustment center 522.

[0107] When the cover 20 deforms and becomes slack, a user can press the button 5221 to withdraw the limit blocks 5222 from the through holes 5211 of the adjustment bars 521 and push the two adjustment bars 521 to move in opposite directions and drive the rod segments 321 to move far away from each other, so that the distance between the two traverse rods 31 is increased to make the cover 20 return to the tense state. After the adjustment is completed, the button 5221 is released to allow the limit blocks 5222 to penetrate into the through holes 5211 of the adjustment bars 521 for limiting the further movement of the adjustment bars 521. Since a plurality of through holes 5211 are arranged, the limit block(s) 5222 and the through holes 5211 form a double-sided multi-gear adjustment configuration and the cover 20 can be adjusted as needed. Furthermore, the engagement of the limit block(s) 5222 and the through holes 5211 inherently results in a stable limit, thus the retaining assembly of Embodiment 5 can be optionally eliminated.

[0108] It should be noted, though the double-sided expansion assembly 52 and the double-sided multi-gear adjustment assembly 52 are described in the embodiments, a single-sided assembly or similar structure, as long as it can move the rod segments 321 away from each other, is also suitable.

Embodiment 7

[0109] Abed, referring to FIG. 17 or FIG. 19, includes the support stand 10, the cover 20, the cover support 30, and an adjustment mechanism. The cover support 30 is connected at the top of the support stand 10, and the cover 20 is connected on the cover support 30 to form a bed surface.

[0110] Preferably, the cover 20 is made of a flexible material, such as oxford fabric cloth, sail cloth, or cotton linen fabric.

[0111] Referring to FIG. 17 to FIG. 20, the cover support 30 includes two traverse rods 31 arranged in the length direction of the bed in parallel. The support stand 10 includes two rod assemblies arranged in the width direction of the bed in parallel. Each of the two rod assemblies includes two support legs 11 and one longitudinal connecting rod 13. Lower ends of the two support legs 11 are symmetrically connected to two ends of the longitudinal connecting rod 13 at an angle greater than 90 to provide good support. Alternatively, the angle can be smaller than or equal to 90 so long as sufficient support is provided. Upper ends of the two support legs 11 are connected to the bottoms of the two traverse rods 31, respectively. The connection between the support leg 11 and the traverse rod 31 or the longitudinal connecting rod 13 can be fixed connection or detachable connection via any suitable connecting member.

[0112] At least one longitudinal connecting rod 13 is composed of a plurality of connecting rod segments 131, and the adjustment mechanism is arranged between adjacent connecting rod segments 131. In the present embodiment, the adjustment mechanism can be implemented in the same way as that of Embodiment 5 or Embodiment 6. Furthermore, to prevent the further movement of the adjustment mechanism after completing adjustment, the retaining mechanism of any embodiment above can be optionally used.

Embodiment 8

[0113] The present embodiment is basically the same as Embodiment 7 except that the connection between the support leg 11 and the longitudinal connecting rod 13 is rotatable connection. As shown in FIG. 21, the lower end of the support leg 11 is rotatably connected to the longitudinal connecting rod 13 through the joint 12, so that the support leg 11 can rotate relative to the longitudinal connecting rod 13, further facilitating the adjustment.

Embodiment 9

[0114] The present embodiment is basically the same as Embodiment 1 except for the structure of the retaining mechanism and the position where the retaining mechanism is arranged. The retaining mechanism of the present embodiment is implemented as follows. Referring to FIG. 22, the retaining mechanism is arranged at the first connecting sleeve 41 that is not mounted with the adjustment mechanism. The retaining mechanism includes the threaded hole 410 and the bolt 412. The outer wall of the first connecting sleeve 41 is provided with the threaded hole 410, and the bolt 412 is in a threaded connection with the threaded hole 410. In the present embodiment, the end of the hollow screw 511 away from the head portion 512 is fixedly connected to one end of the longitudinal rod 32, so that when the hollow screw 511 is rotated, the longitudinal rod 32 will rotate simultaneously. After the adjustment is completed, the bolt 412 is screwed into the threaded hole 410 to abut against the longitudinal rod 32 to prevent further movement.

Embodiment 10

[0115] The present embodiment is basically the same as Embodiment 1 except for the structure of the retaining mechanism. The retaining mechanism of the present embodiment is implemented as follows. Referring to FIGS. 23-25, the retaining mechanism includes the push switch 66 mounted in the mounting groove 414 that is provided at the end of the first connecting sleeve 41 close to the head portion 512. The part of the hollow screw 511 close to the head portion 512 is provided with a plurality of limit grooves 5110 at intervals along the circumferential direction. The width of the bottom of the push switch 66 is slightly smaller than that of the limit groove 5110. The mounting groove 414 has one end provided with the step 4141 and the other end provided with the limit convex 4142. The push switch 66 has one end provided with the recess 661 that is matched with the step 4141 and the other end provided with the limit concave 662 that is matched with the limit convex 4142.

[0116] When the cover 20 deforms and becomes slack, as shown in FIG. 24, a user can press the push switch 66 to enable the disengagement of the limit concave 662 and the limit convex 4142, at this time, the limit concave 662 is further away than the limit convex 4142 from the first connecting sleeve 41 and the bottom of the push switch 66 is aligned with or deviates from the inner wall of the first connecting sleeve 41, thus ensuring the hollow screw 511 can smoothly move into the first connecting sleeve 41 by rotation. After the adjustment of the cover 20 is completed, as shown in FIG. 25, the hollow screw 511 is rotated to the position where the push switch 66 corresponds to the limit groove 5110, the push switch 66 is pressed to enable the engagement of the limit concave 662 and the limit convex 4142, at this time, the bottom of the push switch 66 is located inside the limit groove 5110, thus preventing the hollow 511 from further movement.

Embodiment 11

[0117] The present embodiment is basically the same as Embodiment 1 except for the structure of the adjustment mechanism. In the present embodiment, the adjustment mechanism is a linear ratchet mechanism. Referring to FIG. 28 to FIG. 29, the linear ratchet mechanism includes the mounting base 71, the handle 72, the movable sleeve 73, the first detent 74, and the second detent 75. The mounting base 71 is formed by formulating the rectangular groove 415 on the outer wall of the first connecting sleeve 41. The end of the longitudinal rod 32 is connected inside the movable sleeve 73. The outer wall of the movable sleeve 73 is provided with a plurality of ratchets 731 at intervals. The movable sleeve 73 is inserted and mounted inside the mounting base 71, and the ratchets 731 are located in the rectangular groove 415. One end of the handle 72 is rotatably connected to the mounting base 71 through the rotating shaft 721. The first detent 74 and the second detent 75 are hinged to two sides of the handle 72 symmetrically with respect to the rotating shaft 721, and the length of the second detent 75 is greater than that of the first detent 74. The mounting base 71 is further provided with a handle locking device including the column 81 and the rope 82. The column 81 is fixedly provided on the handle 72, two ends of the rope 82 are fixedly mounted on the mounting base 71, and the rope 82 is configured to be hung on the column to lock the handle 72.

[0118] Referring to FIG. 29, when the linear ratchet mechanism is in release state, the handle 72 is vertical, the first detent 74 detaches from the ratchet 731, and the free end of the second detent 75 engages with the ratchet 731. Referring to FIG. 30, when the handle 72 is pressed toward the first detent 74, the free end of the first detent 74 engages with the ratchet 731 to form an acute angle. As the handle 72 being continuously pressed, the acute angle becomes small, and the force applied by the first detent 74 to the ratchet 731 in the horizontal direction becomes large, thus driving the movable sleeve 73 to move. As shown in FIG. 31, since the ratchets 731 move along with the movable sleeve 73, the first detent 74 may detach from the ratchet 731 with the handle 75 being continuously pressed, namely, the first detent 74 detaches from the ratchet 731 and attaches to the handle 72, and the free end of the second detent 75 abut against the ratchet 731 to prevent further movement. Referring to FIG. 32, when the handle 72 is pressed to the position where the handle 72 is parallel to the mounting base 71, the hinge end of the first detent 74 engages into the gap between two ratchets 731, and the free end of the second detent 75 detaches from the ratchet 731.

[0119] When the cover 20 deforms and becomes slack, as shown in FIG. 26, a user can press the handle 72 to move the movable sleeve 73, which thereby drives the longitudinal rod 32 to move along the direction of increasing the distance between the traverse rods 31, thus returning the cover 20 to tense state, as shown in FIG. 27. After the adjustment of the cover 20 is completed, the rope 82 is hung on the column 81 to lock the handle 72.

Embodiment 12

[0120] The present embodiment is basically the same as Embodiment 5 except for the structure of the adjustment mechanism. In the present embodiment, the adjustment mechanism is implemented the same way as Embodiment 11, as shown in FIG. 33 to FIG. 36.

Embodiment 13

[0121] The present embodiment is basically the same as Embodiment 7 except for the structure of the adjustment mechanism. In the present embodiment, the adjustment mechanism is implemented the same way as Embodiment 11, as shown in FIG. 37 to FIG. 40.

[0122] It should be noted that, for the convenience of transport, all parts/components in each embodiment above can be designed as being detachable as needed. The bed described in any of the above embodiment can be used for human or pets, such as a pet bed, a camp bed, a foldable nap bed, etc.

[0123] The above are only the specific embodiments of the present disclosure, but the technical concept of the present disclosure is not limited thereto, any non-substantive modifications made to the present disclosure based on the technical concept of the present disclosure should be considered as falling within the scope of protection of the present disclosure.