Multi-folding electric folding bed

Abstract

The utility model discloses a multi-folding electric folding bed which comprises a multi-folding bed frame and an electric linear driving device, wherein the multi-folding bed frame is hinged with each other and is fixedly provided with respective bed plates; the electric linear driving device is used for driving the multi-folding bed frame to be unfolded to be in a sleep state or folded to be in a mutually parallel state of the multi-folding bed frame; the electric linear driving device is further hinged to a telescopic rod which drives the multi-folding bed frame to be unfolded and pushes the two outer-end bed frames to be opened outwards to a preset angle so as to avoid a dead point at the same time. The preset angle can be 5 degrees to 15 degrees; a driving rod, extending out of the lower end of the shell, of the electric linear driving device is hinged to a frame type telescopic rod which is composed of a plurality of parallelograms with four connecting points as hinge points and can be unfolded to open the two outer end bed frames or folded to facilitate the multi-folded bed frames to be folded into a mutually parallel state. According to the multi-fold electric folding bed, when the electric linear driving mechanism drives the hinged multi-fold bed frames to be unfolded, the frame type telescopic rods push the two outer-end bed frames to be unfolded to a preset angle at the same time so as to overcome process dead points.

Description

Technical Field

[0001] This utility model relates to the field of electric bed technology, specifically a multi-fold electric folding bed. Background Technology

[0002] Electric folding beds are a type of bed that has been gradually promoted and used in recent years. They are often used in situations where caregivers or on duty need to frequently unfold and fold the bed. When unfolded, they meet the needs of sleeping, while when folded, they reduce storage space.

[0003] Among these, structures using electric linear drive mechanisms, such as electric push rods, to drive the hinged bed frames for unfolding and folding are common. Compared to manual folding and unfolding mechanisms, this is more labor-saving and faster, especially avoiding hand pinching during folding or unfolding. Compared to gear-driven and wire rope-driven folding and unfolding structures, electric linear drive mechanisms driving the hinged bed frames for folding and unfolding are relatively simple in structure, produce relatively less noise during operation, and provide a relatively smooth and reliable folding and unfolding process, with a relatively long service life. Furthermore, multi-fold electric folding beds, such as four-fold or six-fold beds, are gradually emerging.

[0004] However, existing multi-fold electric beds, such as four-fold or six-fold electric beds, inevitably leave dead zones in the manufacturing process because the multiple bed frames, each with its own fixed bed board, are parallel to each other after folding. This makes it difficult to open the bed using the electric linear drive mechanism, such as the electric push rod, after folding. Each time it needs to be opened, after connecting the power, one person must work with both hands or two people must stand on each side to pull the folded bed frame outwards at a certain angle simultaneously before the electric linear drive mechanism, such as the electric push rod, can drive the two bed frames to continue opening until they are fully unfolded into a flat position to meet sleeping needs. The unfolding of existing multi-fold electric folding beds requires bending over, which is both cumbersome and laborious, and over time, it is prone to causing malfunctions in the electric linear drive mechanism, such as the electric push rod and the motor. Summary of the Invention

[0005] The technical problem to be solved by this utility model is to provide a multi-fold electric folding bed that can push the two outer end bed frames to open outward to a predetermined angle while being driven by an electric linear drive mechanism to unfold the multi-fold bed frame that is hinged to each other, so as to overcome the dead point of the process.

[0006] The technical solution of this utility model is to provide a multi-fold electric folding bed, including a multi-fold bed frame with its own bed boards hinged to each other and fixed thereon, and an electric linear drive device for driving the multi-fold bed frame to unfold into a sleeping state or fold into a state in which the multi-fold bed frames are parallel to each other; the electric linear drive device is also hinged to a telescopic structure that pushes the two outer end bed frames to open outward to a predetermined angle to avoid dead points while driving the multi-fold bed frame to unfold.

[0007] With the above structure, this utility model of a multi-fold electric folding bed has the following advantages: While the electric linear drive mechanism unfolds the interconnected multi-fold bed frame, it simultaneously pushes the two outer end frames outwards or expands them to a predetermined angle to overcome process dead points. This overcomes the technical defect of existing technologies that require manual intervention to overcome process dead points and unfold the bed, making the unfolding process convenient, smooth, and fast. It also prevents malfunctions of the electric linear drive mechanism and motor that may be caused by manual intervention.

[0008] Furthermore, the predetermined angle is 5°-15°. By adopting the above-mentioned preferred angle, the technical effect of overcoming process dead spots and smoothly opening the multi-fold bed frame is more significant.

[0009] Furthermore, the electric linear drive unit is fixed to a crossbar in the middle of the bed frame length. The drive rod of the inclined electric linear drive unit extends beyond the upper end of the electric linear drive unit housing. The lower end of the housing is hinged to a telescopic structure. This telescopic structure is composed of multiple parallelograms with four hinge points, and can be opened to expand the two outer ends of the bed frame or retracted to facilitate the folding of the multi-fold bed frame into a parallel state. With the above specific connection relationship and structure, the telescopic structure utilizes the existing electric linear drive unit, saving some material costs and not increasing the power consumption cost of opening and retracting the frame telescopic rod. It also enables the frame telescopic rod to overcome process dead points to smoothly unfold the multi-fold bed frame without hindering the folding of the multi-fold bed frame.

[0010] Furthermore, multiple parallelograms, each with four hinge points, form an odd number of rhombus frames. When closed, the distance between the top and bottom hinge points of each rhombus frame is greater than the distance between the left and right hinge points. When open, the distance between the left and right hinge points of each rhombus frame is equal to or greater than the distance between the top and bottom hinge points. With this specific structure, the frame-type telescopic rod fully utilizes the principle of multiple four-bar linkages. The frame-type telescopic rod has a large force to open and widen the two outer ends of the bed frame, and its opening and closing are convenient, smooth, and quick.

[0011] Furthermore, a vertical rod is fixed to the crossbar of the fixed electric linear drive device, and a first pin is fixed to the lower part of the vertical rod. The first pin hole at the lower hinge point of the middle diamond frame is rotatably engaged with the first pin. A second pin is fixed to the upper hinge point of the middle diamond frame. A vertically elongated through hole is located at the upper part of the vertical rod, and one end of the second pin is slidably engaged in the vertically elongated through hole. The second pin hole at the upper end of an inclined connecting plate is rotatably engaged with the other end of the second pin. The third pin hole at the lower end of the inclined connecting plate is rotatably engaged with the third pin fixed to the lower end of the electric linear drive device housing. A three-headed connecting plate assembly is also hinged to the third pin for driving the second pin at the upper end of the inclined connecting plate to slide up and down along the vertically elongated through hole. After adopting the above specific connection structure between the frame-type telescopic rod and the electric linear drive device, the electric linear drive device can flexibly, effortlessly, smoothly, and quickly drive the frame-type telescopic rod to open and close.

[0012] Furthermore, the three-headed connecting plate assembly includes: a pair of three-headed connecting plates; a U-shaped connecting block fixed to the top surface of the rectangular tube with its opening facing upwards, with a fourth pin fixed on each of the two vertical plates of the U-shaped connecting block; the fourth pin hole on the first head of each three-headed connecting plate also rotates with the third pin, and the fifth pin hole on the second head of each three-headed connecting plate rotates with its respective fourth pin. When the electric linear drive extends upwards, the third pin at the lower end of the housing drives the three-headed connecting plate to rotate around the fourth pin, thereby driving the second pin at the upper end of the inclined connecting plate to slide up and down along the vertical elongated through hole. With the above structure, the electric linear drive drives the frame-type telescopic rod to open and retract more flexibly, effortlessly, smoothly, and quickly; and because the upper and lower ends of the vertical elongated through hole are limited, the opening and retraction ranges of the frame-type telescopic rod are both within the designed predetermined range, making the process of the frame-type telescopic rod supporting the two outer end bed frames to overcome process dead points more accurate, stable, and reliable.

[0013] Furthermore, the crossbar is a rectangular tube; the bottom surface of the second end of each three-headed connecting plate is the retraction limiting surface of the frame-type telescopic rod, and the vertical surface of the third end of each three-headed connecting plate is the opening limiting surface of the frame-type telescopic rod. With this structure, it forms a double limiting mechanism with the aforementioned vertical elongated through-hole, further ensuring that the opening and retraction amplitudes of the frame-type telescopic rod are within the designed predetermined range. This makes the process of the frame-type telescopic rod supporting the two outer end bed frames to overcome process dead points more accurate, stable, and reliable.

[0014] Furthermore, the frame-type telescopic pole has five diamond-shaped frames from left to right: the first and second diamond-shaped frames share a first left-low-right-high sloping connecting plate; the second and third diamond-shaped frames share a second left-low-right-high sloping connecting plate; the third and fourth diamond-shaped frames share a third left-low-right-high sloping connecting plate; and the fourth and fifth diamond-shaped frames share a fourth left-low-right-high sloping connecting plate. With the above more specific structure, the frame-type telescopic rod, which is composed of five rhomboid frames hinged together, has better overall integrity, stronger opening force, and is more accurate, stable and reliable in the process of opening the two outer end bed frames to overcome dead points. Its opening and closing process is more flexible, smooth and quick.

[0015] Furthermore, the electric linear drive unit is fixed to a crossbar in the middle of the bed frame length. The drive rod of the inclined electric linear drive unit extends beyond the upper end of the electric linear drive unit housing. The drive rod extending from the upper end of the housing is hinged to the middle folding bed frame and drives the folding bed frame to a vertically folded state or a horizontally unfolded state. The multi-fold bed frame is a four-fold bed frame. In the four-fold bed frame, the top frame longitudinal bars of all adjacent pairs of bed frames are hinged to their respective horizontal connecting plates and two hinge pins. The middle of the height of all adjacent pairs of bed frames is hinged to the gears in their respective connecting rod gears via hinge pins. The adjacent gears mesh with each other to drive the adjacent bed frames to a vertically folded state or a horizontally unfolded state. With the above structure, the folding and unfolding process between the two middle bed frames and the two outer end bed frames in the multi-fold bed frame, such as the four-fold bed frame, is more flexible, smooth, fast, stable, and reliable, and its linkage effect is better.

[0016] Furthermore, there is a fixed plate on each of the front and rear sides of the middle of the bed frame. The bottom end of each fixed plate is fixed to both ends of the crossbar in the middle of the bed frame length and is equipped with two rollers. Two hinge pins are fixed in the middle of the height of each fixed plate. The pin holes of the two connecting rod gears rotate and engage with their respective hinge pins. Rollers are also provided at the bottom ends of the two front and rear vertical bars at the leftmost end and the two front and rear vertical bars at the rightmost end of the outer two bed frames in the four-fold bed frame. With the above structure, the two vertical bars in the middle of the bed frame are replaced by a fixed plate on each of the front and rear sides. During the folding and unfolding process, the two fixed plates and the crossbar at the bottom of the middle form a basic fixed structure that can remain stationary during the unfolding and folding process, which has better stability and reliability. During the unfolding process, the rollers at the bottom ends of the four vertical bars at the two outer ends make the unfolding and folding process of the multi-fold bed frame more flexible, smooth and quick, and its linkage is better. After folding, with the four rollers at the bottom of the two fixed plates, there are a total of eight rollers, which makes it convenient and effortless to roll the bed frame to place against the wall. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the unfolded structure of an embodiment of the multi-fold electric folding bed of this utility model. Figure 1 (Showing the bed board;) Figures 1-15 Some pins, also known as hinge pins or pivot pins, are drawn using an abbreviated method.

[0018] Figure 2 This is a schematic diagram of the unfolded structure of an embodiment of the multi-fold electric folding bed of this utility model. Figure 2 (The bed board is not shown.)

[0019] Figure 3 yes Figure 2 A magnified structural diagram of A in the middle.

[0020] Figure 4 yes Figure 2 The structural diagram omits components such as longitudinal and transverse rods (highlighting components such as electric push rods, frame-type telescopic rods, connecting rod assemblies, fixing plates, and the first gear).

[0021] Figure 5 yes Figure 4 The diagram omits some components but highlights the frame-type telescopic pole, the three-head connecting plate, and the first vertical pole.

[0022] Figure 6 This is a schematic diagram of the frame-type telescopic pole when it is extended.

[0023] Figure 7 This is a schematic diagram of the frame-type telescopic pole when it is retracted.

[0024] Figure 8 This is a schematic diagram showing the state when the two second gears in the two connecting rod gears are meshed with each other.

[0025] Figure 9 This is a schematic diagram of the folding structure of an embodiment of the multi-fold electric folding bed of this utility model. Figure 1 (The bed board is shown.)

[0026] Figure 10 This is a schematic diagram of the folding structure of an embodiment of the multi-fold electric folding bed of this utility model. Figure 2 (The bed board is not shown.)

[0027] Figure 11 yes Figure 10 A magnified structural diagram of B in the diagram.

[0028] Figure 12 yes Figure 10 A magnified structural diagram of C.

[0029] Figure 13 yes Figure 10 A magnified structural diagram of D in the diagram.

[0030] Figure 14 This is an embodiment of the multi-fold electric folding bed of this utility model. Figure 9 The diagram shows the structure of the bed frame with the telescopic rods extended to support the two outer ends of the bed frame in the desired state.

[0031] Figure 15 This is an embodiment of the multi-fold electric folding bed of this utility model. Figure 1 This is a structural diagram illustrating the process of the material beginning to gather in its current state.

[0032] As shown in the figure:

[0033] 1. Bed frame; 11. First bed frame; 111. Second crossbar; 12. Second bed frame; 13. Third bed frame; 131. Middle longitudinal bar; 14. Fourth bed frame; 141. Third crossbar; 15. First crossbar; 16. Bed board; 17. Short longitudinal bar; 18. First vertical bar; 181. Vertical elongated through hole; 19. Linkage assembly; 191. Short connecting rod; 192. Fifth pin; 193. Long connecting rod; 120. Frame longitudinal bar; 121. Transverse connecting plate; 122. Hinge pin; 123. Connecting rod gear; 1231. First gear; 1232. Second gear; 124. Fixing plate; 125. Roller; 126. Second vertical bar; 127. Third vertical bar;

[0034] 2. Electric push rod; 21. Drive rod; 211. Upper end of drive rod; 22. Housing; 221. Lower end of housing; 23. Motor.

[0035] 3. Frame-type telescopic rod; 31. First pin; 32. Spacer sleeve; 33. First diamond frame; 34. Second diamond frame; 35. Third diamond frame; 36. Fourth diamond frame; 37. Fifth diamond frame; 38. Angled connecting plate; 381. Third pin hole; 39. Three-headed connecting plate; 391. Fourth pin hole; 392. Fifth pin hole; 393. Closing limiting surface; 394. Opening limiting surface; 310. U-shaped connecting block. 311. Second pin; 312. Third pin; 313. Fourth pin; 314. First left-low-right-high inclined connecting plate; 315. First left-high-right-low inclined connecting plate; 316. Second left-low-right-high inclined connecting plate; 317. Second left-high-right-low inclined connecting plate; 318. Third left-low-right-high inclined connecting plate; 319. Third left-high-right-low inclined connecting plate; 320. Fourth left-low-right-high inclined connecting plate; 321. Fourth left-high-right-low inclined connecting plate. Detailed Implementation

[0036] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings. It should be noted that these descriptions of specific embodiments are intended to aid in understanding this utility model, but do not constitute a limitation thereof. Furthermore, the technical features involved in the various specific embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0037] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Figure 9 , Figure 10 , Figure 11 , Figure 12 , Figure 13 , Figure 14 and Figure 15 As shown.

[0038] A preferred embodiment of this utility model of a multi-fold electric folding bed includes a multi-fold bed frame with its own bed boards 16 hinged and fixed to each other, and an electric linear drive device, such as an electric push rod 2, for driving the multi-fold bed frame to unfold into a sleeping state or fold into a parallel state. The electric push rod 2 is driven by a motor 23. The electric linear drive device, such as the electric push rod 2, is also hinged to a telescopic structure that, while driving the multi-fold bed frame to unfold, pushes the two outer end bed frames outwards or expands them to a predetermined angle to avoid dead points. It is easy to understand that the dead points refer to process dead points, such as process dead points caused by insufficient assembly precision or poor workpiece consistency.

[0039] The predetermined angle is preferably 5°-15°.

[0040] The multi-fold bed frame can be a four-fold bed frame, such as... Figure 2 The bed frame shown, from left to right, consists of a first bed frame 11 at the left end, a second bed frame 12 at the middle left end, a third bed frame 13 at the middle right end, and a fourth bed frame 14 at the right end. The two outer bed frames are the first bed frame 11 at the left end and the fourth bed frame 14 at the right end. It is easy to understand that each fold of the bed frame includes at least a side frame vertical bar 120 and a side frame horizontal bar, and may also include a middle vertical bar 131 and a middle horizontal bar such as the first horizontal bar 15.

[0041] An electric linear drive device, such as an electric push rod 2, is fixed on a crossbar, such as a first crossbar 15, in the middle of the length of the bed frame 1. The drive rod 21 of the inclined electric linear drive device, such as the inclined electric push rod 2, extends out of the upper end of the housing 22 of the electric linear drive device, such as the housing 22 of the electric push rod 2. The lower end of the housing 22 is hinged with a telescopic structure. The telescopic structure can be a frame-type telescopic rod 3, which is composed of multiple parallelograms with four connection points, which are all hinge points, and can be opened to support the two outer ends of the bed frame or closed to facilitate the folding of the multi-fold bed frame into a parallel state.

[0042] See Figure 6 and Figure 7 Multiple parallelograms with four hinge points form an odd number of rhombus frames. When closed, the distance between the two hinge points at the top and bottom of each rhombus frame, such as the two pins at the top and bottom, such as the first pin 31 and the second pin 311, is greater than the distance between the two hinge points at the left and right ends, such as the distance between the two pins at the left and right ends. When opened, the distance between the two hinge points at the left and right ends of each rhombus frame is equal to or greater than the distance between the two hinge points at the top and bottom, such as the distance between the two pins at the top and bottom.

[0043] like Figure 3 , Figure 4 and Figure 5 As shown.

[0044] A vertical rod, such as a first vertical rod 18, is fixed to the horizontal bar of a fixed electric linear drive device, such as an electric push rod 2, such as a first horizontal bar 15. A first pin 31 is fixed to the lower part of the first vertical rod 18. The first pin hole at the lower hinge point of the middle diamond frame, such as the third diamond frame 35 described below, is rotatably engaged with the first pin 31. A second pin 311 is fixed to the upper hinge point of the middle diamond frame, such as the third diamond frame 35 described below. The upper part of the first vertical rod 18 has a vertically elongated through hole 181. One end of the second pin 311 is slidably engaged in the vertically elongated through hole 181. 1. Inside; the second pin hole at the upper end of the inclined connecting plate 38 is rotatably engaged with the other end of the second pin shaft 311, and the third pin hole 381 at the lower end of the inclined connecting plate 38 is rotatably engaged with the third pin shaft 312 fixed on the lower end 221 of the housing of the electric linear drive device such as the electric push rod 2, which protrudes downward and is generally cylindrical; a three-headed connecting plate assembly for driving the second pin shaft 311 at the upper end of the inclined connecting plate 38 to slide up and down along the vertical elongated through hole 181 to retract or expand the frame-type telescopic rod 3 is also hinged on the third pin shaft 312.

[0045] The crossbar, such as the first crossbar 15, is a rectangular tube; the three-headed connecting plate assembly includes: a three-headed connecting plate 39; a U-shaped connecting block 310 fixed to the top surface of the rectangular tube of the first crossbar 15 with the opening facing upward, and a fourth pin 313 fixed on each of the two vertical plates of the U-shaped connecting block 310; the fourth pin hole 391 on the first head of each three-headed connecting plate 39 is also rotatably engaged with the third pin 312, and the fifth pin hole 392 on the second head of each three-headed connecting plate 39 is rotatably engaged with its respective fourth pin 313. When the upper end 211 of the drive rod of the electric linear drive device, such as the electric push rod 2, extends upward, the third pin 312 at the lower end 221 of the housing drives the three-headed connecting plate 39 to rotate around the fourth pin 313, thereby driving the second pin 311 at the upper end of the inclined connecting plate 38 to slide up and down along the vertical elongated through hole 181 to retract or expand the frame-type telescopic rod 3. The bottom surface of the second end of each three-headed connecting plate 39 serves as the retraction limiting surface 393 of the frame-type telescopic rod 3, and the vertical surface of the third end of each three-headed connecting plate 39 serves as the opening limiting surface 394 of the frame-type telescopic rod 3. It is easy to understand that the retraction limiting surface 393 restricts the maximum retraction size of the frame-type telescopic rod 3; once the retraction limiting surface 393 is in contact with the top surface of the rectangular tube of the first crossbar 15, the frame-type telescopic rod 3 can no longer retract. Conversely, the opening limiting surface 394 restricts the maximum opening size of the frame-type telescopic rod 3; once the opening limiting surface 394 is in contact with a vertical surface of the rectangular tube of the first crossbar 15, the frame-type telescopic rod 3 can no longer open.

[0046] See Figure 6 and Figure 7 The frame-type telescopic pole 3 has five diamond-shaped frames from left to right: the first diamond frame 33 and the second diamond frame 34 share a first left-low-right-high inclined connecting plate 314, the first diamond frame 33 and the second diamond frame 34 share a first left-high-right-low inclined connecting plate 315; the second diamond frame 34 and the third diamond frame 35 share a second left-low-right-high inclined connecting plate 316, the second diamond frame 34 and the third diamond frame 35 share a second left-high-right-low inclined connecting plate 317; the third diamond frame 35 and the fourth diamond frame 36 share a third left-low-right-high inclined connecting plate 318, the third diamond frame 35 and the fourth diamond frame 36 share a third left-high-right-low inclined connecting plate 319; the fourth diamond frame 36 and the fifth diamond frame 37 share a fourth left-low-right-high inclined connecting plate 320, the fourth diamond frame 36 and the fifth diamond frame 37 share a fourth left-high-right-low inclined connecting plate 321.

[0047] See Figure 5 A spacer sleeve 32 can be fitted on the other end of the second pin 311 to keep the oblique connecting plate 38 and the second left-low-right-high oblique connecting plate 316 of the third rhomboid frame 35 parallel to each other.

[0048] See Figure 14The aforementioned electric linear drive device, such as the electric push rod 2, has a telescopic rod, such as a frame-type telescopic rod 3, hinged to its drive rod 21. While driving the multi-fold bed frame, such as a four-fold bed frame, to unfold, it simultaneously pushes the two outer end bed frames outwards to a predetermined angle to avoid process dead points. Specifically, the contact points may be: the leftmost end of the first rhomboid frame 33 at the left end of the frame-type telescopic rod 3 opens the second crossbar 111 at the leftmost end of the first bed frame 11; the rightmost end of the fifth rhomboid frame 37 at the right end of the frame-type telescopic rod 3 opens the third crossbar 141 at the rightmost end of the fourth bed frame 14.

[0049] like Figure 3 , Figure 4 and Figure 5 As shown.

[0050] As described above, the electric linear drive device, such as the electric push rod 2, is fixed to a crossbar, such as the first crossbar 15, in the middle of the length of the bed frame 1. The drive rod 21 of the inclined electric linear drive device, such as the electric push rod 2, extends out of the upper end of the housing 22 of the electric linear drive device, such as the housing of the electric push rod 2. The upper end 211 of the drive rod extending out of the upper end of the housing 22 is hinged to a folding bed frame, such as the third bed frame 13, in the middle, and drives the third bed frame 13 to a vertically folded state or a horizontally unfolded state.

[0051] The hinge structure here can take the following specific form: a short longitudinal rod 17 parallel to the electric push rod 2 can be fixed on the first crossbar 15; the hinge structure here can include a linkage assembly 19, one end of a pair of short connecting rods 191 of the linkage assembly 19 is hinged to both sides of a rectangular tube of a longitudinal rod such as a middle longitudinal rod 131 in the middle of the front and rear sides of the top of the third bed frame 13, and the other end of the pair of short connecting rods 191 is hinged to the upper end 211 of the drive rod via a fifth pin 192; one end of a pair of long connecting rods 193 of the linkage assembly 19 is also hinged to the fifth pin 192, and the other end of the pair of long connecting rods 193 of the linkage assembly 19 is hinged to both sides of the rectangular tube of the short longitudinal rod 17.

[0052] like Figure 1 , Figure 2 , Figure 4 , Figure 8 , Figure 9 , Figure 10 , Figure 11 , Figure 12 , Figure 13 , Figure 14 and Figure 15 As shown.

[0053] In the four-fold bed frame, the top edge longitudinal bars 120 of all adjacent two-fold bed frames are hinged by their respective transverse connecting plates 121 and two hinge pins 122; the middle of the height of all adjacent two-fold bed frames is hinged to the gears in their respective connecting rod gears 123 by hinge pins 122, and the adjacent two gears mesh with each other to drive the adjacent bed frames to a vertically folded state or a horizontally unfolded state. For example: the first gear 1231 of the third bed frame 13 meshes with the first gear 1231 of the second bed frame 12 and drives the second bed frame 12 to a vertically upward folded state or a horizontally unfolded state; the second gear 1232 of the second bed frame 12 meshes with the second gear 1232 of the first bed frame 11 and drives the first bed frame 11 to a vertically downward folded state or a horizontally unfolded state; the second gear 1232 of the third bed frame 13 meshes with the second gear 1232 of the fourth bed frame 14 and drives the fourth bed frame 14 to a vertically downward folded state or a horizontally unfolded state. The connecting rod gear 123 refers to a connecting rod with gears at both ends, such as the first gear 1231 or the second gear 1232. The connecting rod and the gear are an integral unit, which can be welded and fixed as a whole, or it can be integrally formed and processed as a whole. According to the actual application of this utility model, the gear can be a multi-part gear. For example, the first gear 1231 of the third bed frame 13 and the first gear 1231 of the second bed frame 12 that mesh with each other are both multi-part gears with the gear on top. When the electric push rod 2 folds the third bed frame 13 upward into a vertical position, the two adjacent gears 1231 mesh with each other and fold the second bed frame 12 upward into a straight vertical position, parallel to the third bed frame 13 including the bed board 16. For example, in the case of meshing second bed frame 12 and first bed frame 11, both the second gear 1232 is a lower half-gear. When meshing, the first bed frame 11 is folded downwards to a vertical position and parallel to the second bed frame 12, including the bed board 16. Similarly, in the case of meshing third bed frame 13 and fourth bed frame 14, both the second gear 1232 is a lower half-gear. When meshing, the fourth bed frame 14 is folded downwards to a vertical position and parallel to the third bed frame 13, including the bed board 16. The radius of the first gear 1231 used for upward folding of adjacent bed frames can be larger than the radius of the second gear 1232 used for downward folding of adjacent bed frames. The hinge holes of the first gear 1231 and the second gear 1232 can both be called hinge pin holes or pin holes.

[0054] The two vertical bars on the front and rear sides of the middle of the bed frame 1 can each be replaced by a fixed plate 124: There is a fixed plate 124 on each of the front and rear sides of the middle of the bed frame 1. The bottom end of each fixed plate 124 is fixed to the two ends of the horizontal bar in the middle of the length of the bed frame 1, such as the first horizontal bar 15, and can be provided with two rollers 125. Two hinge pins 122 are fixed in the middle of the height of each fixed plate 124. The hinge pin holes or pin holes of the gears 1231 in the two connecting rod gears 123 are rotatably engaged with their respective hinge pins 122. The bottom ends of the two front and rear vertical bars at the leftmost end of the two outermost bed frames in the four-fold bed frame, such as the second vertical bar 126, and the two front and rear vertical bars at the rightmost end, such as the third vertical bar 127, can be provided with rollers 125.

[0055] It is not difficult to understand that the multiple hinge points of the frame-type telescopic rod 3, the multiple hinge points of the connecting rod assembly 19, the hinge points of the transverse connecting plate 121 and the side frame longitudinal rods 120 of each bed frame, and the hinge points of the gear and the vertical rod and fixing plate 124 mentioned above can all be formed by the rotational engagement of the pin holes or pin shaft holes on the rod, tube or plate at the hinge point with their respective pin shafts or hinge pins or shaft pins. Both ends of the pin shaft or hinge pin can be axially limited. For example, the body of the pin shaft or hinge pin or shaft pin is a circular cylinder with a shoulder or large head, and the other end of the circular cylinder has a threaded hole in which a screw with a shoulder or large head is screwed; or one end is a shoulder or large head, and the other end has a radial hole into which a cotter pin is inserted, etc. Since these hinge structures themselves do not have an inventive point and are existing technology, they will not be discussed in detail.

[0056] Electric linear drive mechanisms are also called electric linear drive mechanisms or linear actuators, such as electric actuators 2 and cylinders. Electric actuators 2 are also called electric push rods. Fixing methods include welding, screwing, or interference fits. Directional terms such as up, down, left, right, front, and back are for ease of description and not limitation. The terms pin, hinge pin, and shaft pin are interchangeable. The terms pin hole, hinge pin hole, and pin shaft hole are interchangeable. The terms unfolding, opening, and spreading are interchangeable. The terms closing and retracting are interchangeable. Rotational fit can also be understood as rotational connection.

[0057] Components, structures, or quantities not marked above are not shown in the drawings, and some components are not marked in the drawings. The drawings are for illustrative purposes only. In case of any inconsistencies between the drawings and the text descriptions, or between the drawings themselves, the text descriptions shall prevail.

[0058] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A multi-fold electric folding bed comprising a multi-fold bed frame hinged to each other and fixed with respective bed boards, and an electric linear drive device driving the multi-fold bed frame to be unfolded into a transverse sleeping state or folded into a vertical multi-fold bed frame state in which the multi-fold bed frames are parallel to each other; characterized in that: The electric linear drive device is also hinged with a telescopic structure which pushes the two outer end bed frames outward to a predetermined angle to avoid the dead point while the multi-fold bed frame is unfolded.

2. The multi-fold power fold bed of claim 1, wherein: The predetermined angle is 5-15 degrees.

3. The multi-fold power fold bed of claim 1, wherein: The electric linear drive device is fixed on a crossbar in the middle of the bed frame, the driving rod of the oblique electric linear drive device extends out of the upper end of the electric linear drive device shell, and the lower end of the shell is hinged with a telescopic structure which is a frame type telescopic rod composed of multiple parallelograms with all four connection points being hinge points and can be unfolded to support the two outer end bed frames or folded to facilitate the folding of the multi-fold bed frame into a parallel state.

4. The multi-fold power fold bed of claim 3, wherein: The multiple parallelograms with all four connection points being hinge points are single diamond frames, when folded, the distance between the upper and lower hinge points of each diamond frame is greater than the distance between the left and right hinge points, and when unfolded, the distance between the left and right hinge points is equal to or greater than the distance between the upper and lower hinge points.

5. The multi-fold power fold bed of claim 4, wherein: A vertical rod is fixed on the crossbar where the electric linear drive device is fixed, a first pin shaft is fixed at the lower part of the vertical rod, and a first pin hole at the lower hinge point of the middle diamond frame is rotationally fitted on the first pin shaft; a second pin shaft is fixed at the upper hinge point of the middle diamond frame, the upper part of the vertical rod has a vertical long hole, and one end of the second pin shaft is slidingly fitted in the vertical long hole; a second pin hole at the upper end of an oblique connecting plate is rotationally fitted on the other end of the second pin shaft, and a third pin hole at the lower end of the oblique connecting plate is rotationally fitted with a third pin shaft fixed at the lower end of the electric linear drive device shell, and a three-headed connecting plate assembly for driving the second pin shaft at the upper end of the oblique connecting plate to slide up and down in the vertical long hole is also hinged on the third pin shaft.

6. The multi-fold power fold bed of claim 5, wherein: The three-headed connecting plate assembly includes: a pair of three-headed connecting plates; a H-shaped connecting block fixed on the top surface of the crossbar with the opening upward, two vertical plates of the H-shaped connecting block each have a fourth pin shaft fixed thereon; the fourth pin hole on the first head of each three-headed connecting plate is also rotationally fitted with the third pin shaft, and the fifth pin hole on the second head of each three-headed connecting plate is rotationally fitted with the respective fourth pin shaft, when the electric linear drive device is elongated upward, the third pin shaft at the lower end of the shell drives the three-headed connecting plate to rotate around the fourth pin shaft, thereby driving the second pin shaft at the upper end of the oblique connecting plate to slide up and down in the vertical long hole.

7. The multi-fold power fold bed of claim 6, wherein: The crossbar is a rectangular tube; the bottom surface of the second head of each three-headed connecting plate is the folding limiting surface of the frame type telescopic rod, and the vertical surface of the third head of each three-headed connecting plate is the unfolding limiting surface of the frame type telescopic rod.

8. The multi-fold power fold bed of claim 4, wherein: The frame type telescopic rod has five rhombic frames from left to right, the first rhombic frame and the second rhombic frame share a first left low right high inclined connecting plate, and the first rhombic frame and the second rhombic frame share a first left high right low inclined connecting plate; the second rhombic frame and the third rhombic frame share a second left low right high inclined connecting plate, and the second rhombic frame and the third rhombic frame share a second left high right low inclined connecting plate; the third rhombic frame and the fourth rhombic frame share a third left low right high inclined connecting plate, and the third rhombic frame and the fourth rhombic frame share a third left high right low inclined connecting plate; the fourth rhombic frame and the fifth rhombic frame share a fourth left low right high inclined connecting plate, and the fourth rhombic frame and the fifth rhombic frame share a fourth left high right low inclined connecting plate.

9. The multi-fold power fold bed of claim 1, wherein: The electric linear drive device is fixed on a horizontal rod in the middle of the bed frame, and the oblique driving rod of the electric linear drive device extends out of the upper end of the electric linear device shell, and the driving rod extending out of the upper end of the shell is hinged to the middle folding bed frame and drives the folding bed frame to be in a vertical folding state or a horizontal unfolded state; the multiple folding is four folding, and the top frame longitudinal rods of all adjacent two folding bed frames in the four folding bed frame are hinged through respective horizontal connecting plates and two hinge pins, the middle parts of all adjacent two folding bed frames in height are hinged through hinge pins and gears in respective connecting rod gears, and the adjacent two gears are meshed with each other to drive the adjacent bed frame to be in a vertical folding state or a horizontal unfolded state.

10. The multi-fold power fold bed of claim 9, wherein: Each of the two sides of the middle of the bed frame has a fixed plate, the bottom end of each fixed plate is fixed to the two ends of the horizontal rod in the middle of the bed frame and is provided with two rollers, the middle part of each fixed plate in height is fixed with two hinge pins, and the hinge pin holes of the two connecting rod gears are rotationally fitted on the respective hinge pins, and the bottom ends of the leftmost front and rear vertical rods and the rightmost front and rear vertical rods of the two bed frames at the outer end of the four folding bed frame are provided with rollers.

Images