Lock pin type structure capable of locking and folding bed tail guardrail to serve as small table plate

Abstract

The invention discloses a lock pin type structure capable of locking and folding a bed tail guardrail to serve as a small table plate, and relates to the technical field of nursing beds, the lock pin type structure comprises a bed main frame, two movable tail frames, two guardrail plates, two pin shafts A, two bed tail frame lock pins, two spring bolt limiting pieces, two rotary supporting plectrums and two pin shafts B; the guardrail plate is fixed on the movable tail frame through a screw, the movable tail frame is provided with a bed tail joint movable batten, and the bed tail joint movable batten is provided with a pin shaft hole. After the movable tail frame is turned over, the size of the bed body in the length direction is obviously shortened, the bed body can smoothly pass through a residential elevator and a narrow corridor, and the problem that an existing bed body is too long and difficult to transfer is solved; the guardrail plate is also used as a small table plate, and an independent small table plate structure does not need to be additionally designed, so that the additional manufacturing cost is saved, the small table plate is prevented from occupying space when being idle, the suitability of narrow and small scenes such as home nursing and small rehabilitation mechanisms is greatly improved, and the delivery and use cost of the bed body is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of nursing beds, in particular to a lock pin type structure capable of locking and folding a bed tail guardrail as a small table board. BACKGROUND

[0002] In the field of nursing, rehabilitation and medical beds, the bed tail guardrail is a core component to ensure patient safety and prevent patients from falling from the bed tail. The small table board is an important auxiliary structure to meet the daily needs of patients, such as eating, reading, and placing medical devices. Both are key components of such beds.

[0003] Currently, the bed tail guardrails in the industry are mainly divided into fixed, hanging and plug-in structures: among them, the fixed bed tail guardrail is fixed through rigid connection with the bed main frame. Although it has the advantages of high connection strength and strong stability, it is suitable for home nursing beds, fixed rehabilitation beds and other scenes that do not need to be frequently disassembled. However, it also leads to the total length of the bed body usually exceeding 2m, while the depth of most residential elevators is only about 1.5m, making it difficult for the bed body to enter the elevator, greatly increasing the difficulty of bed body transfer and delivery transportation cost, and limiting its use in small living spaces or small rehabilitation institutions. The hanging bed tail guardrail adopts a detachable hanging structure, which can be quickly disassembled, but is limited by the carrying capacity of the hanging joint, and its load-bearing performance is weak, which cannot meet the higher strength use requirements of patients leaning against it, and there is a safety hazard. The plug-in bed tail guardrail is locked with the bed body through a pin to achieve height adjustment, which has high flexibility, but the pin needs to be manually inserted and removed each time the bed is disassembled and assembled, which is tedious to operate, and the pin is prone to wear and tear after long-term use, resulting in a decrease in locking reliability. SUMMARY

[0004] (I) Technical problems solved

[0005] To solve the above problems of the prior art, the present application provides a lock pin type structure capable of locking and folding a bed tail guardrail as a small table board.

[0006] (II) Technical solutions

[0007] In order to achieve the above object, the present application is realized by the following technical scheme: A lock pin type structure capable of locking and folding the bed tail guardrail as a small table board, comprising a bed main frame, two movable tail frames, two guardrail boards, two pin shafts A, two bed tail frame lock pins, two lock tongue limiting sheets, two rotating support knobs and two pin shafts B; the guardrail board is fixed on the movable tail frame by screws; the movable tail frame is provided with a bed tail joint movable board strip; the bed tail joint movable board strip is provided with a pin shaft hole; and the movable tail frame is rotationally connected with the upper pin shaft hole on the side of the rotating shaft plate at the end of the bed main frame through the pin shaft A; the bed tail frame lock pin is slidably inserted into the lower pin shaft hole of the rotating shaft plate; the lock tongue limiting sheet is assembled with a torsion spring; and the rotating support knob is rotationally connected with the lower pin shaft hole of the square tube of the bed main frame through the pin shaft B.

[0008] As a preferred scheme of the lock pin type structure capable of locking and folding the bed tail guardrail as a small table board, the bed tail frame lock pin comprises a lock tongue rod, a knurled thin nut, a compression spring, a flared washer and a pull ring arranged in sequence; the knurled thin nut is provided with a matching surface B; the flared washer is provided with an A surface; the compression spring is sleeved on the middle part of the bed tail frame lock pin, and the two ends thereof abut against the knurled thin nut and the flared washer respectively.

[0009] As a preferred scheme of the lock pin type structure capable of locking and folding the bed tail guardrail as a small table board, the lock tongue limiting sheet is provided with a B surface and a C surface; one end of the torsion spring is connected with the lock tongue limiting sheet, and the other end thereof is connected with the square tube of the bed main frame, so as to drive the lock tongue limiting sheet to rotate around the pin shaft B.

[0010] As a preferred scheme of the lock pin type structure capable of locking and folding the bed tail guardrail as a small table board, the rotating support knob is provided with a circular hole, a D surface and a handle; the circular hole can cooperate with the lock tongue rod of the bed tail frame lock pin, so as to realize the locking of the rotating support knob.

[0011] As a preferred scheme of the lock pin type structure capable of locking and folding the bed tail guardrail as a small table board, the side of the rotating shaft plate at the end of the bed main frame is provided with two upper and lower pin shaft holes, and the side lower part is provided with a pin shaft hole matched with the bed tail frame lock pin; the bed tail joint movable board strip of the movable tail frame is provided with a matching surface A; and the matching surface A can be attached to the matching surface B of the knurled thin nut.

[0012] As a preferred solution of the lock pin type structure of the bed tail guardrail locking and folding as a small table board, when the guardrail board is used as a bed tail guardrail, the lock tongue rod of the bed tail frame lock pin is inserted into the round hole of the rotating support lever, the matching surface B of the knurled thin nut is attached to the matching surface A of the bed tail joint movable strip, and the D surface of the rotating support lever is attached to the C surface of the lock tongue limiting piece.

[0013] As a preferred solution of the lock pin type structure of the bed tail guardrail locking and folding as a small table board, when the lock movable tail frame, pull the pull ring to pull out the bed tail frame lock pin, rotate the support lever around the pin shaft B and release the lock tongue limiting piece, and the B surface of the lock tongue limiting piece is attached to the A surface of the horn gasket to limit the reset of the bed tail frame lock pin.

[0014] As a preferred solution of the lock pin type structure of the bed tail guardrail locking and folding as a small table board, when the small table board is reset to the guardrail board, push the guardrail board to the vertical state, press the handle of the rotating support lever to rotate it around the pin shaft B, the D surface of the rotating support lever presses the C surface of the lock tongue limiting piece, the B surface of the lock tongue limiting piece is separated from the A surface of the horn gasket, the bed tail frame lock pin is reset and locked under the action of the compression spring.

[0015] (Three) beneficial effects

[0016] The present application provides a lock pin type structure of the bed tail guardrail locking and folding as a small table board. It has the following beneficial effects:

[0017] 1. After the movable tail frame is turned over, the length of the bed body is significantly shortened, which can smoothly pass through the residential elevator and narrow corridor, solving the problem of long bed body transportation difficulty; the guardrail board serves as a small table board, eliminating the need for additional design of independent small table board structure, saving additional manufacturing cost, avoiding space occupation when the small table board is idle, greatly improving the adaptability of small space such as family nursing and small rehabilitation institutions, and reducing the cost of bed delivery and use.

[0018] 2. The lock tongue rod is inserted into the round hole of the rotating support lever to lock the lever, the knurled thin nut matching surface B is attached to the movable tail frame matching surface A to fix the tail frame, and the rotating support lever presses the lock tongue limiting piece to avoid interference, effectively preventing the tail frame from loosening when the patient leans against the guardrail, solving the problem of unreliable locking of the existing plug-in guardrail, ensuring the core safety requirement of the nursing and rehabilitation bed anti-falling, and adapting to the strict requirement of medical scene on structure stability.

[0019] 3. When unlocking, only pull the pull ring to release the lock, the lock tongue limiting piece is automatically limited by the torsional spring to prevent the lock pin from rebounding; when resetting, push the guardrail to the vertical state, press the knob handle to trigger the lock pin to reset automatically, two-step operation throughout can complete the switching of the guardrail and the small table board, avoiding the defect that the existing hanging type guardrail is complicated to disassemble and assemble, adapting to the quick operation of non-professional personnel such as nursing staff and patient family members, and improving the use efficiency of the nursing scene. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0021] Figure 1 is a structural schematic diagram of the whole of the present application;

[0022] Figure 2 is a structural schematic diagram of the whole of the present application; Figure 1

[0023] Figure 3 is a structural schematic diagram of the whole of the present application;

[0024] Figure 4 is a structural schematic diagram of the whole of the present application;

[0025] Figure 5 is a structural schematic diagram of the whole of the present application Figure 4

[0026] Figure 6 is a structural schematic diagram of the whole of the present application.

[0027] In the drawings, 1 is a guardrail plate; 2 is a movable tail plate; 3 is a pin shaft A; 4 is a bed head frame lock pin; 401 is a lock tongue rod; 402 is a horn gasket; 403 is a pull ring; 404 is a knurled thin nut; 405 is a compression spring; 5 is a lock tongue limiting piece; 6 is a rotating support knob; 7 is a pin shaft B; 8 is a bed main frame; 9 is a rotating shaft plate; 10 is an A surface; 11 is a B surface; 12 is a C surface; 13 is a D surface; 14 is a bed tail joint movable batten; 15 is a matching surface A; 16 is a matching surface B. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application.

[0029] Referring to Figures 1 to 6 ​​As shown, the present invention provides a technical solution: a locking pin structure that allows the bed foot rail to be locked and folded up as a small table, including a main bed frame 8, two movable tail frames, two guardrail plates 1, two pins A3, two bed foot frame locking pins, two locking tongue limiting pieces 5, two rotating support levers 6, and two pins B7; the guardrail plates 1 are fixed to the movable tail frames with screws, the movable tail frames are provided with bed foot joint movable plates 14, the bed foot joint movable plates 14 have pin holes, and are rotatably connected to the pin holes on the upper side of the rotating shaft plate 9 at the end of the main bed frame 8 through pins A3; the bed foot frame locking pins are slidably inserted into the rotating shaft plate 9. The lower side pin hole; the locking tongue limiting piece 5 is equipped with a torsion spring, and together with the rotating support lever 6, it is rotatably connected to the lower pin hole of the square tube of the main bed frame 8 via pin B7; the bed tail frame locking pin can fix the movable tail frame in the locked state, so that the guardrail 1 can be used as the bed tail guardrail. After unlocking, flipping the movable tail frame can switch the guardrail 1 to a horizontal state. It is fixed to the movable tail frame by screws. The movable plate 14 of the bed tail joint of the movable tail frame is rotatably connected to the upper side pin hole of the rotating shaft plate 9 at the end of the main bed frame 8 via pin 1. The bed tail frame locking pin slides into the lower side pin hole of the rotating shaft plate 9, and can stably fix the movable tail frame in the locked state. The movable tail frame allows the guardrail panel 1 to reliably function as a bed foot rail to prevent patients from falling from the foot of the bed, meeting the core safety requirements for fall prevention in nursing, rehabilitation, and medical beds. When the locking pin of the bed foot frame is unlocked, the movable tail frame can be flipped to switch the guardrail panel 1 from a vertical to a horizontal position. At this time, the guardrail panel 1 can be directly used as a small table, eliminating the need for a separate small table structure, significantly reducing the overall manufacturing cost of the bed, and avoiding the problem of a separate small table occupying space in the nursing area when not in use, effectively improving the space utilization rate of the nursing environment. After the movable tail frame is flipped, the length dimension of the bed is significantly shortened, effectively solving the problem of... The existing nursing, rehabilitation, and medical beds, due to their fixed guardrails, are too long to pass through narrow corridors or enter residential elevators, posing a transportation challenge. This design aims to reduce the difficulty of bed transportation and lower delivery costs. The locking tongue limit plate 5 is equipped with a torsion spring and, together with the rotating support lever 6, is rotatably connected to the lower pin hole of the square tube of the bed main frame 8 via a pin shaft 2. This linkage design ensures the structural stability of the movable tail frame during the switching of the guardrail plate 1 to the small table and the return of the small table to the guardrail plate 1, preventing structural jamming or accidental loosening during the switching process and ensuring operational reliability during long-term use.

[0030] Reference Figure 2 , Figure 4 and Figure 6As shown in this embodiment: the bed end frame locking pin includes a locking tongue rod 401, a knurled thin nut 404, a compression spring 405, a flared washer 402, and a pull ring 403 arranged sequentially; the knurled thin nut 404 has a mating surface B16, the flared washer 402 has a surface A10, the compression spring 405 is sleeved in the middle of the bed end frame locking pin, and its two ends abut against the knurled thin nut 404 and the flared washer 402 respectively; the locking tongue limiting piece 5 has a surface B11 and a surface C12; one end of the torsion spring is connected to the locking tongue limiting piece 5, and the other end is connected to the square tube of the bed main frame 8, which can drive the locking tongue limiting piece 5 to rotate around the pin shaft B7; the rotation support lever 6 has a round hole and is equipped with... D-side 13 and the handle; the circular hole can engage with the locking tongue 401 of the bed tail frame locking pin to lock the rotating support lever 6. A compression spring 405 is sleeved in the middle of the locking pin, with its two ends abutting against the knurled thin nut 404 and the horn washer 402 respectively. In the locked state, it provides continuous elastic pressure to the knurled thin nut 404, ensuring a tight fit between the mating surface B16 of the knurled thin nut 404 and the mating surface A15 of the movable plate slat 14 of the movable bed tail frame joint. This prevents the movable bed tail frame from loosening due to increased clearance caused by long-term use. Simultaneously, after unlocking, it can drive the bed tail frame locking pin to automatically reset, ensuring the timeliness and reliability of the locking action; the mating surface of the knurled thin nut 404... B16 and the A-side 10 of the speaker gasket 402 respectively serve the functions of locking and limiting contact. Together with the B-side 11 and C-side 12 of the latch limiter 5, when the bed tail frame locking pin is unlocked, the latch limiter 5 rotates around the pin B7 under the driving force of the torsion spring. Its B-side 11 can precisely abut against the A-side 10 of the speaker gasket 402, effectively limiting the bed tail frame locking pin from unexpectedly rebounding during the rotation of the movable tail frame, avoiding structural jamming or locking failure. The elastic driving force of the torsion spring ensures that the limiting action of the latch limiter 5 responds quickly, requiring no additional manual operation and improving the level of automated structural control. The rotating support lever 6 connects to the latch rod 401 of the bed tail frame locking pin through a round hole. When locked, the rotating support lever 6 can be securely locked, preventing it from rotating unexpectedly due to external impact. At the same time, its D-side 13 can fit with the C-side 12 of the locking tongue limit plate 5. When locked, pressing the locking tongue limit plate 5 will disengage it from the A-side 10 of the horn pad 402, avoiding interference of the limit plate with the locking pin. The handle design of the rotating support lever 6 provides a convenient point of force for manual operation. When the small table is reset to the guardrail, simply pressing the handle will drive the lever to rotate around the pin B7, thereby pushing the locking tongue limit plate 5 out of the limit state. The entire operation does not require professional tools and is suitable for the operation needs of non-professionals such as nursing staff and patients' families.

[0031] Reference Figure 1 , Figure 2 , Figure 4 and Figure 5As shown, in particular, the end of the bed main frame 8 is provided with two pin holes on the side of the rotating shaft plate 9, and a pin hole is provided below the side to match the bed tail frame lock pin; the bed tail joint movable plate 14 of the movable tail frame is provided with a matching surface A 15, which can be matched with the matching surface B 16 of the knurled thin nut 404; when the guard plate 1 is used as a bed tail guardrail, the lock tongue rod 401 of the bed tail frame lock pin is inserted into the round hole of the rotating support knob 6, the matching surface B 16 of the knurled thin nut 404 is matched with the matching surface A 15 of the bed tail joint movable plate 14; at the same time, the D surface 13 of the rotating support knob 6 is matched with the C surface 12 of the lock tongue limiting piece 5, and the lock tongue limiting piece 5 is pressed to make it always separate from the A surface 10 of the horn gasket 402; when the movable tail frame is unlocked, the bed tail frame lock pin is pulled out by the pull ring 403, the rotating support knob 6 rotates around the pin shaft B 7 under the action of gravity and releases the lock tongue limiting piece 5, the B surface 11 of the lock tongue limiting piece 5 is pressed against the A surface 10 of the horn gasket 402 under the action of the torsional spring, and the bed tail frame lock pin is reset; when the small table plate is reset to the guard plate 1, the guard plate 1 is pushed to the vertical state, the handle of the rotating support knob 6 is pressed to make it rotate around the pin shaft B 7, the D surface 13 of the rotating support knob 6 presses the C surface 12 of the lock tongue limiting piece 5, and the B surface 11 of the lock tongue limiting piece 5 is separated from the A surface 10 of the horn gasket 402, the bed tail frame lock pin is reset and locked under the action of the compression spring 405, and the movable tail frame is provided with precise installation reference for the rotating connection of the bed tail joint movable plate 14 of the movable tail frame through the pin shaft A 3, which is provided with two pin holes on the side of the end of the bed main frame 8, to ensure the stability of the rotating track during the turning of the movable tail frame and avoid the turning jam caused by installation deviation; the pin hole below the side matches the bed tail frame lock pin, which can ensure the coaxiality when the bed tail frame lock pin is inserted, prevent the lock pin from being stuck or locked due to hole position deviation, and lay a structural foundation for reliable locking and smooth unlocking of the lock pin. The matching surface A 15 of the bed tail joint movable plate 14 of the movable tail frame can be precisely matched with the matching surface B 16 of the knurled thin nut 404 of the bed tail frame lock pin, and when the guard plate 1 is used as a bed tail guardrail, the lock tongue rod 401 of the bed tail frame lock pin is inserted into the locking function of the round hole of the rotating support knob 6, which greatly improves the stability of the movable tail frame after locking, effectively prevents the movable tail frame from loosening when the patient leans against or collides with the guardrail, and ensures the reliability of the guardrail anti-falling function; at the same time, the D surface 13 of the rotating support knob 6 is matched with the C surface 12 of the lock tongue limiting piece 5, and the lock tongue limiting piece 5 is pressed to make it always separate from the A surface 10 of the horn gasket 402, which can avoid the unexpected limiting of the lock tongue limiting piece 5 to the bed tail frame lock pin in the locked state of the guardrail, ensure that the lock pin is always in a stable locking position, and eliminate the structural interference in the locked state.When the activity tail frame is unlocked, the bed tail frame lock pin can be pulled out by pulling the pull ring 403, which is convenient to operate and does not require professional tools. The support knob 6 rotates around the pin shaft B7 under the action of gravity and releases the lock tongue limiting piece 5. The lock tongue limiting piece 5 rotates quickly under the action of the torsional spring elastic driving force, and the B face 11 accurately abuts against the A face 10 of the horn gasket 402, which can effectively limit the accidental rebound of the bed tail frame lock pin during the turning process of the activity tail frame, prevent the problem of lock pin jamming the activity tail frame or unlocking failure, and ensure the smoothness of the turning operation after unlocking. When the small table plate is reset to the guardrail plate 1, pushing the guardrail plate 1 to the vertical state can drive the activity tail frame to return to the original position. Pressing the handle of the rotating support knob 6 makes it rotate around the pin shaft B7, and the D face 13 presses the C face 12 of the lock tongue limiting piece 5, which makes the B face 11 of the lock tongue limiting piece 5 separate from the A face 10 of the horn gasket 402, thereby releasing the limiting of the bed tail frame lock pin. At this time, the bed tail frame lock pin is automatically reset under the action of the elastic reset force of the compression spring 405, and the locking of the activity tail frame is re-implemented.

[0032] Working principle: In the initial guardrail locking state, the guardrail plate 1 is fixed with the activity tail frame through screws. The activity tail frame is connected with the bed main frame 8 through the pin shaft A3 and the rotating shaft plate 9. The bed tail frame lock pin is inserted into the rotating support knob 6 under the action of the pre-tightening force of the compression spring 405, and the lock tongue rod 401 is inserted into the knob hole to lock the knob, and the knurled thin nut 404 cooperates with the A face 15 of the activity tail frame to fix the activity tail frame, so that the guardrail plate 1 is vertical and serves as a falling protection guardrail. At the same time, the D face 13 of the rotating support knob 6 presses the B face 11 of the lock tongue limiting piece 5 to make it separate from the A face 10 of the horn gasket 402, thereby avoiding interference with the locking. When the small table plate is needed, the bed tail frame lock pin is pulled by the pull ring 403, the lock tongue rod 401 is pulled out of the knob hole, and the cooperating face B16 is separated. After the rotating support knob 6 is rotated by gravity, the B face 11 of the lock tongue limiting piece 5 abuts against the A face 10 of the horn gasket 402 to limit the reset of the lock pin. The activity tail frame is manually turned to drive the guardrail plate 1 to be horizontal and serve as a small table plate. When the guardrail is needed to be reset, the guardrail plate 1 is pushed to drive the activity tail frame to return to the original position. The handle of the rotating support knob 6 is pressed to make the D face 13 press the lock tongue limiting piece 5 to separate from the limiting. The bed tail frame lock pin is reset under the action of the compression spring 405. The lock tongue rod 401 is inserted into the knob hole, and the cooperating face B16 is re-cooperated to lock the activity tail frame, so that the guardrail plate 1 returns to the vertical state. The overall mechanism cooperates to provide driving force through elastic elements, realizes locking and unlocking through mechanical components, and completes the turning of the movable components. The function can be switched stably without professional tools, and it is suitable for nursing, rehabilitation and medical beds.

[0033] It should be noted that in this text, relational terms such as first and second are used only to distinguish one entity or action from another, and do not necessarily require or imply any such actual relationship or order between these entities or actions.

Claims

1. A lock pin type structure which can lock and fold a bed tail guardrail as a small desk board, characterized in that: The utility model provides a bed tail frame locking device, including bed main frame (8), two movable tail frame (2), two guardrail board (1), two pin shaft A (3), two bed tail frame lock pin (4), two lock tongue limiting piece (5), two rotary support prongs (6) and two pin shaft B (7), the guardrail board (1) is fixed on movable tail frame (2) through screw, movable tail frame (2) is equipped with bed tail joint movable batten (14), bed tail joint movable batten (14) is opened pin shaft hole, and is rotatedly connected through pin shaft A (3) with the upper side pin shaft hole of pivot plate (9) end of bed main frame (8), bed tail frame lock pin (4) is slidably inserted into the lower side pin shaft hole of pivot plate (9), lock tongue limiting piece (5) is equipped with torsion spring, and is rotatedly connected with bed main frame (8) square tube lower pin shaft hole through pin shaft B (7) with rotary support prongs (6) together, bed tail frame lock pin (4) can fix movable tail frame (2) in locking state, makes guardrail board (1) use as bed tail guardrail, and after unlocking, the bed tail frame lock pin (4) can make the guardrail board (1) switch to the horizontal state small table board of turning over movable tail frame (2).

2. The lock pin type structure which can lock and fold the bed tail guardrail as a small desk board according to claim 1, characterized in that: The bed tail frame lock pin (4) includes a lock tongue rod (401), a knurled thin nut (404), a compression spring (405), a flared washer (402), and a pull ring (403) arranged in sequence. The knurled thin nut (404) is provided with a matching surface B (11), the flared washer (402) is provided with an A surface (10), and the compression spring (405) is sleeved in the middle part of the bed tail frame lock pin (4) and abuts against the knurled thin nut (404) and the flared washer (402) at both ends.

3. The lock pin type structure which can lock and fold the bed tail guardrail as a small desk board according to claim 2, characterized in that: The lock tongue limiting piece (5) is provided with a B surface (11) and a C surface (12), one end of the torsion spring is connected to the lock tongue limiting piece (5), the other end is connected to the square tube of the bed main frame (8), and the lock tongue limiting piece (5) can be driven to rotate around the pin shaft B (7).

4. The lock pin type structure capable of locking and folding the bed tail guardrail as a small desk board according to any one of claims 1-3, characterized in that: The rotary support prong (6) has a circular hole and is provided with a D surface (13) and a handle. The circular hole can cooperate with the lock tongue rod (401) of the bed tail frame lock pin (4) to realize the locking of the rotary support prong (6).

5. The lock pin type structure capable of locking and folding the bed tail guardrail as a small desk board according to any one of claims 1-4, characterized in that: The pivot plate (9) at the end of the bed main frame (8) has two pin shaft holes on the side surface, and a pin shaft hole adapted to the bed tail frame lock pin (4) is formed on the lower side. The bed tail joint movable batten (14) of the movable tail frame (2) is provided with a matching surface A (15), and the matching surface A (15) can be attached to the matching surface B (11) of the knurled thin nut (404).

6. The lock pin type structure capable of locking and folding the bed end guardrail as a small desk board according to any one of claims 1-5, characterized in that: When the guardrail board (1) is used as a bed tail guardrail, the lock tongue rod (401) of the bed tail frame lock pin (4) is inserted into the circular hole of the rotary support prong (6), the matching surface B (11) of the knurled thin nut (404) is attached to the matching surface A (15) of the bed tail joint movable batten (14), and at the same time, the D surface (13) of the rotary support prong (6) is attached to the C surface (12) of the lock tongue limiting piece (5), and the lock tongue limiting piece (5) is pressed to make it detach from the A surface (10) of the flared washer (402).

7. The lock pin type structure which can lock and fold the bed tail guardrail as a small desk board according to any one of claims 1-6, characterized in that: When the unlocking activity tail frame (2) is pulled, the pull ring (403) pulls out the bed tail frame lock pin (4), rotates the support knob (6) around the pin shaft B (7) and loosens the lock tongue limiting piece (5). The lock tongue limiting piece (5) rotates under the action of the torsion spring, and the B surface (11) of the lock tongue limiting piece (5) abuts against the A surface (10) of the horn gasket (402), limiting the reset of the bed tail frame lock pin (4).

8. The lock pin type structure which can lock and fold the bed tail guardrail as a small desk board according to any one of claims 1-7, characterized in that: When the small table plate is reset to the guardrail plate (1), the guardrail plate (1) is pushed to the vertical state, the handle of the rotating support knob (6) is pressed to make it rotate around the pin shaft B (7), the D surface (13) of the rotating support knob (6) presses the C surface (12) of the lock tongue limiting piece (5), so that the B surface (11) of the lock tongue limiting piece (5) is separated from the A surface (10) of the horn gasket (402), and the bed tail frame lock pin (4) is reset and locked under the action of the compression spring (405).

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