Electric back-pushing bed frame

Abstract

The present invention discloses an electric back-pushing bed frame. There is a chute on the inner side of each of the two first longitudinal rods fixed to the first cross bar. Both ends of a sliding rod are slidably engaged in the two chutes. The first end and the second end of one end of an X-shaped driving frame with a hinge point as the intersection point are respectively hinged to one end of the first cross bar and one end of the sliding rod. The third end and the fourth end of the other end of the X-shaped driving frame are respectively in rolling engagement with the first rollers in the roller grooves fixed to the inner side of the other end of the sliding rod and the inner side of the other end of the first cross bar. Both ends of a linear driving device are respectively hinged to the second end and the third end. One end of two jacking rod assemblies is hinged to both ends of the sliding rod, and the rollers at the other end are in rolling engagement with two second longitudinal rods fixed to the third cross bar and the first cross bar to extend or retract the movable frame. When the electric back-pushing bed frame retracts, it is in a lying flat state, can be quickly extended, has strong jacking force, and the driving of the driving mechanism is stable, reliable and flexible.

Description

Technical Field

[0001] The present invention relates to the technical field of beds, and more specifically, to an electric back-pushing bed frame. Background Art

[0002] With the improvement of people's living quality, the functional requirements for beds are getting higher and higher. For example, before going to sleep, people generally hope to be in a sitting position or a semi-reclined state to read books, watch TV, or play with mobile phones, etc. Electric lift beds have emerged, which can raise the head bed board or the head bed frame of the bed from the waist of a person from an angle of 0° (i.e., the flat lying state) to any angle within 90° for sitting, semi-reclining, or flat lying with the head lifted. Later, some technical personnel designed an electric back-pushing bed frame according to the objective reality that most existing beds are ordinary beds and people have the need to sit or semi-recline. The electric back-pushing bed frame includes a fixed frame fixed to the top surface of the bed board of an ordinary bed or the ordinary bed frame, and a movable frame hinged to the fixed frame. There is a linear drive mechanism such as an electric push rod or a cylinder between the fixed frame and the movable frame.

[0003] However, the existing electric back-pushing bed frames still have the following deficiencies: 1. When some movable frames and fixed frames retract, they are in a parallel state (i.e., the included angle is zero or close to zero). When the two frames extend, the power is insufficient and it is difficult to extend quickly. To solve the above problems, generally, a certain included angle is left after the movable frame and the fixed frame are folded, but new technical problems such as an increase in the packaging volume and packaging difficulty and the inability of people to lie flat appear. 2. The jacking force of some movable frames driven by a single linear drive mechanism to rotate around the hinge axis is insufficient. When two linear drive mechanisms are used, the synchronization and coordination are lacking. 3. The structure of some drive mechanisms is relatively complex, and some drive conversion points are in a suspended state, and their stability, reliability, and conversion flexibility all need to be improved. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide an electric back-pushing bed frame that is in a flat lying state when retracted, can extend quickly, has a strong jacking force, and the drive of the drive mechanism is stable, reliable, and flexible.

[0005] The technical solution of the present invention is to provide an electric back-pushing bed frame, which includes a rectangular fixed frame and a rectangular movable frame. The outer side of the first cross bar of the rectangular fixed frame is hinged to the second cross bar of the rectangular movable frame;

[0006] There is a chute on the inner side of each of the two first longitudinal bars fixed to the first cross bar, and both ends of a sliding rod are slidably matched in the two chutes;

[0007] One end of an X-shaped drive frame with a hinge point at the intersection is hinged to one end of a first cross bar and one end of a sliding rod respectively. The third end and the fourth end of the other end of the X-shaped drive frame are in rolling cooperation with respective first rollers in roller grooves fixed to the inner sides of the other end of the sliding rod and the other end of the first cross bar. Two ends of a linear drive device are respectively hinged to the second end and the third end.

[0008] One end of two first lifting rods is hinged to two ends of the sliding rod. The other end of the two first lifting rods is hinged to the middle sections of respective second lifting rods. One end of the two second lifting rods is hinged to two ends of the inner side of the first cross bar. Second rollers on the other ends of the two second lifting rods are in rolling cooperation with a movable frame.

[0009] After adopting the above structure, the electric back-pushing bed frame of the present invention has the following advantages:

[0010] Because this structure enables the movable frame and the fixed frame to reach the following mutually parallel state when retracting, that is, the included angle between the movable frame and the fixed frame around their hinge points is zero or close to zero. At the same time, because the linear drive device, such as the following electric push rod, pushes horizontally in the transverse direction, and the drive conversion point is supported by the first roller and the roller groove. When converted to the longitudinal direction, both ends of the sliding rod are supported by the chute. Then, through the rolling support of the first lifting rods and the second lifting rods hinged to each other on both sides and the second rollers, its supporting force is strong, the lifting force is sufficient, and it can be quickly extended in the state where the included angle between the movable frame and the fixed frame is zero. When the movable frame and the fixed frame retract, its thickness is maximally thinned, which not only reduces the packaging volume and cost, but also reduces the packaging difficulty, and enables people to lie flat completely to improve the sleep quality.

[0011] Because only one linear drive device, such as one electric push rod, is required to push horizontally in the transverse direction, and the drive conversion point is supported by the first roller and the roller groove. When converted to the longitudinal direction, both ends of the sliding rod are supported by the chute. Then, through the rolling support of the first lifting rods and the second lifting rods hinged to each other on both sides and the second rollers, it achieves the harmonious unity of the technical effects of strong supporting force, sufficient lifting force, good synchronism and strong coordination of the first lifting rods and the second lifting rods on both sides. At the same time, its structure is simple, and the lifting process and the retracting process are both flexible, stable and reliable.

[0012] Further, the portions of both ends of the sliding rod that are slidably engaged with the sliding grooves are the outermost ends; the hinged portions of both ends of the sliding rod with the first jacking rod are located at the inner ends of the slidably engaged portions; the hinged portion of the sliding rod with the second end is located at the inner end of the hinged portion of the sliding rod with the first jacking rod, and the portion of the sliding rod where the roller groove is fixed is located at the inner end of the hinged portion of the sliding rod with the first jacking rod. After adopting the above structure, the sliding engagement of both ends of the first sliding rod with the sliding grooves, the hinging of both ends of the first sliding rod with the first jacking rod, the hinging of the first sliding rod with the second end of the X-shaped drive frame, and the rolling engagement with the third end do not interfere with each other, further ensuring that the movement of the linear drive device in the horizontal direction is converted into the movement of the sliding rod in the vertical direction, and then into the strong supporting force, good jacking force, good synchronous coordination, flexible, stable and reliable technical effects of the first jacking rod and the second jacking rod driving the movable frame to rotate upward or downward along its hinge axis during the jacking and retracting processes.

[0013] Further, the X-shaped drive frame is formed by hinging two inclined plates with a hinge pin at the intersection. The first end and the third end are located at both ends of one of the inclined plates, and the second end and the fourth end are located at both ends of the other inclined plate; the first end and the third end are arc-shaped plates extending outward and laterally from both ends of one inclined plate, and the second end and the fourth end are arc-shaped plates extending outward and laterally from both ends of the other inclined plate. The hinge points of the four ends are all on their respective arc-shaped plates. After adopting the above structure, the hinging structure of the four ends with their respective hinge points is more firm and reliable, further ensuring the flexibility, stability and reliability of the conversion of horizontal movement into vertical movement.

[0014] Further, a reinforcing block extends from the inner side of the arc-shaped plate of the second end, and a reinforcing block also extends from the inner side of the arc-shaped plate of the third end. The tail end of the housing of the electric push rod is hinged to one of the reinforcing blocks, and the free end of the piston rod extending from the head end of the housing of the electric push rod is hinged to the other reinforcing block. After adopting the above structure, the hinging structure of the tail end of the housing of the electric push rod and the free end of the piston rod of the electric push rod with the third end at both ends of the linear drive device is more firm and reliable, further ensuring the flexibility, stability and reliability of the conversion of horizontal movement into vertical movement.

[0015] Further, the axes of the motor and the gearbox of the electric push rod are perpendicular to the axis of the housing of the electric push rod at 90°. The corresponding part of the sliding rod at the tail end of the motor and the gearbox of the electric push rod is a bow-shaped arm extending outward. The inner side of the bow-shaped arm forms a groove for accommodating the tail end of the motor and the gearbox of the electric push rod. After adopting the above structure, the driving force of the electric push rod with the axes of the motor and the gearbox perpendicular to the axis of the housing of the electric push rod at 90° is stronger, the driving effect is better, and it does not interfere with the normal sliding stroke and flexibility of the sliding rod, further ensuring the flexibility, stability and reliability of the conversion of horizontal movement into vertical movement.

[0016] Furthermore, the axes of the pin shafts used for hinging both ends of the electric push rod are in the shortest distance state from each other: the relative distance between the first cross bar and the sliding rod is the farthest, and the sliding rod is the closest to the fourth cross bar. The movable frame is parallel to the fixed frame, and the thickness when they are placed flat is the thinnest. After adopting the above structure, it further ensures the technical effects of reducing the packaging volume and cost, reducing the packaging difficulty, and enabling people to lie flat completely, and further ensures the technical effects of strong supporting force, high jacking force, and being able to quickly extend when the included angle between the movable frame and the fixed frame is zero.

[0017] Furthermore, the axes of the pin shafts used for hinging both ends of the electric push rod are in the longest distance state from each other: the relative distance between the first cross bar and the sliding rod is the closest, and the sliding rod is the farthest from the fourth cross bar. The included angle between the movable frame and the fixed frame is the maximum backrest angle, and the person leans on the movable frame in a sitting position. After adopting the above structure, it further meets the needs of people for the multi-function of the bed with an electric back push bed frame.

[0018] Furthermore, the axes of the pin shafts used for hinging both ends of the electric push rod are in a state between the shortest and the longest: the relative distance between the first cross bar and the sliding rod is between the closest and the farthest, the sliding rod and the fourth cross bar are between the farthest and the closest, the included angle between the movable frame and the fixed frame is less than the maximum backrest angle and greater than 0°. The person leans on the movable frame in a semi-reclined state or a full reclined state. After adopting the above structure, it further meets the needs of people for the multi-function of the bed with an electric back push bed frame. For example, one can lie flat completely under the condition that the head is slightly tilted upwards, or can be in a semi-reclined state. For example, in the most comfortable semi-reclined state, the included angle between the movable frame and the fixed frame can be adjusted to 15° - 45°, making the psychological experience of the user better.

[0019] Furthermore, the second rollers on the other ends of the two second jacking rods respectively are in rolling cooperation with two second longitudinal rods with one end fixed to the second cross bar and the other end fixed to the third cross bar. After adopting the above structure, it can better meet the needs of the jacking of the movable frame. Description of the Drawings

[0020] Figure 1 is the structural schematic diagram of the unfolded state of the electric back push frame of the present invention Figure 1 (The pin shafts for hinging are not shown in the figure, and the same applies to the following remaining figures).

[0021] Figure 2 is Figure 1 the enlarged structural schematic diagram of A in

[0022] Figure 3 is the structural schematic diagram of the unfolded state of the electric back push frame of the present invention Figure 2

[0023] Figure 4 is Figure 3 the enlarged structural schematic diagram of B in

[0024] Figure 5 Yes Figure 3 Schematic enlarged structure diagram of C in it.

[0025] Figure 6 It is a schematic structural diagram of the unfolded state of the electric back push frame of the present invention Figure 3 .

[0026] Figure 7 It is a schematic structural diagram of the retracted state of the electric back push frame of the present invention Figure 1 .

[0027] Figure 8 It is a schematic structural diagram of the retracted state of the electric back push frame of the present invention Figure 2 .

[0028] Figure 9 It is a schematic structural diagram of the retracted state of the electric back push frame of the present invention Figure 3 .

[0029] As shown in the figure: 1. First hinge ear, 2. Third longitudinal rod, 3. Second longitudinal rod, 4. Connecting cross rod, 5. Connecting longitudinal rod, 6. Third cross rod, 7. Movable frame, 8. Second roller, 9. Second lifting rod, 10. First longitudinal rod, 11. Circular connecting plate, 12. Fixed frame, 13. Chute, 14. Bow-shaped arm, 15. Motor and gearbox, 16. Groove, 17. First cross rod, 18. Second cross rod, 19. First lifting rod, 20. X-shaped drive frame, 21. Sliding rod, 22. Arc plate, 23. Reinforcing block, 24. Roller groove, 25. Piston rod, 26. Housing, 27. Inclined plate, 28. First end, 29. Second end, 30. Fourth end, 31. Third end, 32. First through hole, 33. Electric push rod, 34. Fourth cross rod, 35. Second through hole, 36. Connector, 37. First roller. Specific embodiments

[0030] The following further describes the specific embodiments of the present invention in conjunction with the accompanying drawings. It should be noted here that the description of these specific embodiments is for helping to understand the present invention, but does not constitute a limitation to the present invention. In addition, the technical features involved in the following specific embodiments of the present invention can be combined with each other as long as they do not conflict with each other.

[0031] As Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 and Figure 9 shown.

[0032] The electric back-pushing bed frame of the present invention includes a rectangular fixed frame 12 and a rectangular movable frame 7. The outer side of the first cross bar 17 of the rectangular fixed frame 12 is hinged to the second cross bar 18 of the rectangular movable frame 7, specifically to the outer side of the second cross bar 18. It is not difficult to understand that when the present invention is installed on an existing bed with bed legs, the head end of the electric back-pushing bed frame of the present invention can be sunken by one step, that is, the top plane of the movable frame 7 of the electric back-pushing bed frame of the present invention is on the same plane as the top surface of the bed board below the waist or the leg end of the existing bed board. Or vice versa, first fix the electric back-pushing bed frame of the present invention, and then raise the bed board below the waist or the leg end of the original bed so that the top surface of the bed board below the waist or the leg end is on the same horizontal plane as the top surface of the movable frame 7 of the electric back-pushing bed frame of the present invention. A connecting plate for connecting with the existing bed board, such as a circular connecting plate 11, can be provided at the bottom of the fixed frame 12.

[0033] For the electric back-pushing bed frame of the present invention, there is a chute 13 on the inner side of each of the two first longitudinal bars 10 fixed to the first cross bar 17. The two ends of a sliding rod 21 are slidably fitted in the two chutes 13. It is not difficult to understand that one end of the two first longitudinal bars 10, that is, the waist end, is fixed to the first cross bar 17, and the other end of the two first longitudinal bars 10, that is, the head end, is fixed to the fourth cross bar 34.

[0034] The first end 28 and the second end 29 at one end of an X-shaped drive frame 20 with a hinge point at the intersection point are respectively hinged to one end of the first cross bar 17 and one end of the sliding rod 21. The third end 31 and the fourth end 30 at the other end of the X-shaped drive frame 20 are respectively in rolling fit through their respective first rollers 37 in the roller grooves 24 fixed to the inner side of the other end of the sliding rod 21 and the inner side of the other end of the first cross bar 17. The two ends of a linear drive device, such as the electric push rod 33 described below, are respectively hinged to the second end 29 and the third end 31.

[0035] One end of each of the two first lifting rods 19 is hinged to both ends of the sliding rod 21, and the other end of each of the two first lifting rods 19 is hinged to the middle section of its respective second lifting rod 9. One end of each of the two second lifting rods 9 is hinged to both ends of the inner side of the first cross bar 17, and the second rollers 8 on the other end of each of the two second lifting rods 9 are in rolling cooperation with the movable frame 7, such as directly in rolling cooperation with the plate-shaped movable frame. Or in rolling cooperation with the two second longitudinal rods 3: the second rollers 8 on the other end of each of the two second lifting rods 9 are in rolling cooperation with the two second longitudinal rods 3 with one end fixed to the second cross bar 18 and the other end fixed to the third cross bar 6. The above embodiments of rolling cooperation with the movable frame 7 are elaborated as follows. One end of a first lifting rod 19 is hinged to one end of the sliding rod 21, and one end of the other first lifting rod 19 is hinged to the other end of the sliding rod 21. The other end of a first lifting rod 19 is hinged to the middle section of a second lifting rod 9, and the other end of the other first lifting rod 19 is hinged to the middle section of the other second lifting rod 9. One end of a second lifting rod 9 is hinged to one end of the inner side of the first cross bar 17, and one end of the other second lifting rod 9 is hinged to the other end of the inner side of the first cross bar 17. One of the second rollers 8 on the other end of a second lifting rod 9 is in rolling cooperation with one of the second longitudinal rods 3 with one end fixed to the second cross bar 18 and the other end fixed to the third cross bar 6; the other second roller 8 on the other end of the other second lifting rod 9 is in rolling cooperation with the other second longitudinal rod 3 with one end fixed to the second cross bar 18 and the other end fixed to the third cross bar 6.

[0036] The parts where both ends of the sliding rod 21 are in sliding cooperation with the sliding grooves 13 are the outermost ends. The hinged parts of both ends of the sliding rod 21 with the first lifting rods 19 are located at the inner ends of the sliding cooperation parts. The hinged part of the sliding rod 21 with the second end 29 is located at the inner end of the hinged part of the sliding rod 21 with the first lifting rods 19, and the part of the sliding rod 21 where the roller groove 24 is fixed is located at the inner end of the hinged part of the sliding rod 21 with the first lifting rods 19.

[0037] The X-shaped drive frame 20 is formed by hinging two inclined plates 27 at the cross-over point through a hinge pin (not shown in the figure), and the through hole at the cross-over point is not marked in the figure. The first end 28 and the third end 31 are located at both ends of one of the inclined plates 27, and the second end 29 and the fourth end 30 are located at both ends of the other inclined plate 27. The first end 28 and the third end 31 are arc-shaped plates 22 extending outward and to the outside from both ends of one of the inclined plates 27, and the second end 29 and the fourth end 30 are arc-shaped plates 22 extending outward and to the outside from both ends of the other inclined plate 27. The hinge points of the four ends are all on their respective arc-shaped plates 22.

[0038] The linear drive device is preferably an electric push rod 33. Inside the arc-shaped plate 22 of the second end 29, a reinforcing block 23 extends. Inside the arc-shaped plate 22 of the third end 31, a reinforcing block 23 also extends. The tail end of the housing 26 of the electric push rod 33 is hinged to one of the reinforcing blocks 23, and the free end of the piston rod 25 extending from the head end of the housing 26 of the electric push rod 33 is hinged to the other reinforcing block 23. The linear drive device can also be a cylinder or an electric cylinder. An electric cylinder is also called a servo electric cylinder or an electric actuator. The piston rod 25 is also called a telescopic rod.

[0039] The axis of the motor and the gearbox 15 of the electric push rod 33 and the axis of the housing 26 of the electric push rod 33 are mutually at 90°. At the position corresponding to the tail end of the motor and the gearbox 15 of the electric push rod 33 on the sliding rod 21, there is an arcuate arm 14 extending outward. The inner side of the arcuate arm 14 forms a groove 16 for accommodating the tail end of the motor and the gearbox 15 of the electric push rod 33.

[0040] Of course, if the linear drive device uses a cylinder or an electric push rod or an electric cylinder whose axis of the housing is parallel to the axis of the motor and the gearbox, then the part of the sliding rod corresponding to the linear drive device does not need to be an arcuate arm, but a straight rod, such as a straight rectangular steel pipe.

[0041] It is not difficult to understand that both the first cross bar 17 and the fourth cross bar 34 of the rectangular fixing frame 12 can be made of rectangular steel pipes. The two first longitudinal bars 10 of the rectangular fixing frame 12 provided with the sliding grooves 13 can be made of U-shaped steel pipes with the opening facing inwards. The second cross bar 18, the third cross bar 6, the two third longitudinal bars 2 on both sides, the two second longitudinal bars 3 that are in rolling cooperation with the second rollers 8, the middle connecting cross bar 4 and the connecting longitudinal bar 5 of the rectangular movable frame 7 can all be made of rectangular steel pipes. The corner of the free side of the movable frame 7 away from the hinged side can be an arc-shaped corner.

[0042] The axes of the pins used for hinging both ends of the electric push rod 33 are in the shortest distance state: the relative distance between the first cross bar 17 and the sliding rod 21 is the farthest, and the sliding rod 21 is the closest to the fourth cross bar 34. The movable frame 7 is parallel to the fixing frame 12 and the thickness of the two when placed flat is the thinnest. Here, the parallel can be understood as the top plane and the bottom plane of the movable frame 7 being parallel to the top plane and the bottom plane of the fixing frame 12.

[0043] The axes of the pins used for hinging both ends of the electric push rod 33 are in the longest distance state: the relative distance between the first cross bar 17 and the sliding rod 21 is the closest, and the sliding rod 21 is the farthest from the fourth cross bar 34. The included angle between the movable frame 7 and the fixing frame 12 is the maximum backrest angle, and the person leans on the movable frame in a sitting position. The maximum backrest angle can be understood in this way: the maximum backrest angle refers to the maximum angle that the movable frame 7 can expand relative to the fixing frame 12. The maximum backrest angle is, for example, between 50° and 90°.

[0044] The state where the axial distances between the pin shafts for hinging both ends of the electric push rod 33 are between the shortest and the longest: the relative distance between the first cross bar 17 and the sliding rod 21 is between the closest and the farthest, the distance between the sliding rod 21 and the fourth cross bar 34 is between the farthest and the closest, the included angle between the movable frame 7 and the fixed frame 12 is less than the maximum backrest angle and greater than 0°, and the person relying on the movable frame 7 is in a semi-reclined state or a full-reclined state.

[0045] The pin shafts or hinge pins for hinging both ends of the electric push rod 33 are not shown in the figure, and only the two through holes for inserting the pin shafts, namely the first through hole 32 and the second through hole 35, are shown. It is not difficult to understand that the axes of the two pin shafts or hinge pins are the axes of the two through holes, that is, the axis of the first through hole 32 and the axis of the second through hole 35. The distance between the axes of the two pin shafts is the distance between the axes of the two through holes.

[0046] The parallel state of the movable frame 7 and the fixed frame 12 means that the included angle between the movable frame 7 and the fixed frame 12 is 0°. It is not difficult to understand that for a more comfortable semi-reclined state, the included angle between the movable frame 7 and the fixed frame 12 is 15° - 45°.

[0047] It is not difficult to understand that for all the hinges described above, a pin shaft can pass through two through holes, and then axial limitation can be achieved, such as using a large head or shaft shoulder at one end and a nut at the other end for axial limitation, or an opening pin can be inserted into the transverse through hole on the pin shaft at the other end for axial limitation. The specific structures of the hinge plates with two through holes can be different. For example, the U-shaped connecting head 36 at the free end of the piston rod 25 of the electric push rod 33 is inserted into the reinforcing block 23 of the third end 31. A vertical pin shaft is inserted into a through hole or the first through hole 32 of the connecting head 36, a through hole of the reinforcing block 23, and another through hole of the connecting head 36, and then axially limited for hinging; the U-shaped connecting head 36 at the tail end of the housing 26 of the electric push rod 33 is inserted into the reinforcing block 23 of the second end 29. A vertical pin shaft is inserted into a through hole or the second through hole 35 of the connecting head 36, a through hole of the reinforcing block 23, and another through hole of the connecting head 36, and then axially limited for hinging. Another example is that the hinge between the movable frame 7 and the fixed frame 12 can adopt two pairs of first hinge ears 1 on both sides. One hinge ear in each pair of first hinge ears 1 is fixed, such as welded to the outside of the first cross bar 17, and the other hinge ear is fixed, such as welded to the outside of the second cross bar 18. Each hinge ear has a through hole for inserting a pin shaft. A horizontal pin shaft passes through the two through holes and is axially limited for hinging. Another example is that there is a through hole on the arc plate 22 of the first end 28. One end of the inner side of the first cross bar 17 is fixed, such as welded with a second hinge ear provided with a through hole; there is a through hole on the arc plate 22 of the second end 29. One end of the inner side of the sliding rod 21 is fixed, such as welded with a third hinge ear provided with a through hole. A vertical pin shaft passes through the two through holes and is axially limited for hinging. Another example is that the two first lifting rods 19 and the two second lifting rods 9 can both adopt U-shaped steels with the openings facing the fourth cross bar 34; both ends of the inner sides of the sliding rod 21 and both ends of the inner sides of the first cross bar 17 are fixed, such as welded with a pair of U-shaped connecting blocks with opposite openings. One end of the two first lifting rods 19 and one end of the two second lifting rods 9 are respectively axially limited by inserting a horizontal pin shaft into the through holes of the four U-shaped connecting blocks for hinging; the other ends of the two first lifting rods 19 and the middle sections of the two second lifting rods 9 are axially limited by the inserted horizontal pin shafts through their respective through holes. There is a through hole on the arc plate 22 of the third end 31 and the arc plate 22 of the fourth end 30 described above. Each first roller 37 is rotationally fitted on the bottom surface of the arc plate 22 through a vertically axially limited pin shaft and is rollingly fitted in its respective roller groove 24.

[0048] When the movable frame 7 and the fixed frame 12 are in a parallel state, that is, the included angle between the two is 0°, when the movable frame 7 needs to be rotated upward around the pin shaft for their hinge connection, start the linear drive device, such as starting the electric push rod 33 to extend the piston rod 25. The distance between the axis of the pin shaft for the hinge connection of the third end 31, that is, the axis of the first through hole 32, and the axis of the pin shaft for the hinge connection of the second end 29, that is, the axis of the second through hole 35, becomes longer. The sliding rod 21 gets closer to the first cross bar 17, and the first lifting rod 19 and the second lifting rod 9 rotate the movable frame 7 upward, that is, gradually unfold it. Stop the electric push rod 33 halfway, and the movable frame 7 can be stopped at any angle greater than 0° and less than the maximum backrest angle with the fixed frame 12 to meet the needs of people lying flat, semi - lying, or sitting on the bed relying on the movable frame. Lying flat can be understood as the movable frame 7 being slightly lifted around its own hinge pin shaft, or the free end being slightly upturned in a lying - flat state. The movable frame is also called a movable plate.

[0049] When the movable frame 7 needs to be laid flat and in a lying - flat state, start the linear drive device, such as starting the electric push rod 33 to retract the piston rod 25. The distance between the axis of the pin shaft for the hinge connection of the third end 29, that is, the axis of the first through hole 32, and the axis of the pin shaft for the hinge connection of the second end 29, that is, the axis of the second through hole 35, becomes shorter. The sliding rod 21 gets farther away from the first cross bar 17 and gets closer to the fourth cross bar 34. The first lifting rod 19 and the second lifting rod 9 rotate the movable frame 7 downward, that is, gradually fold it up until the movable frame 7 is parallel to the fixed frame 12, that is, the included angle between the two is 0°. At this time, the thickness of the flat - laid movable frame 7 and the fixed frame 12 is the thinnest. Then turn off the power supply of the electric push rod 33 to meet the needs of people lying flat.

[0050] For the convenience of description, the present invention only describes the electric back - pushing bed frame. It is not difficult to understand that the structure of the electric back - pushing bed frame of the present invention can also be used for an integral bed frame. Just stack the fixed frame 12 and the movable frame 7 in a straight line instead of parallel on the top surface of the original bed board or bed frame. That is, the fixed frame 12 serves as the bed board for supporting the lower part of the human body, such as the legs, and the functions of the fixed frame 12 of the present invention are all borne by the head bed board or bed frame of the original bed directly below the movable bed board. The structure installed on the fixed frame 12 and the connection structure between the movable frame 7 and the fixed frame 12 are all installed on the head bed board or bed frame of the original bed and are all connected to the head bed board or bed frame of the original bed. Of course, the top surface of the movable frame 7 and the top surface of the fixed frame 12 are on the same horizontal plane in the retracted or folded - up state. In other words, if there are other technical solutions that adopt the same or equivalent structure as the present invention, except that after the movable frame 7 and the fixed frame 12 are laid flat, they are not stacked one above the other but are in a straight line or on the same horizontal plane, and the structure installed on the fixed frame 12 of the present invention is all installed on the integral bed or integral bed frame directly below the movable frame and is all connected to the movable frame 7 to enable the movable frame 7 to rotate upward or downward around the hinge axis, and thus can be in a lying - flat, full - lying, semi - lying, or sitting posture, it falls within the protection scope of this patent application.

[0051] The components, structures, quantities, etc. not marked above are not shown in the drawings. The drawings are only schematic. In case of any inconsistency between the drawings and the written description or among the drawings themselves, the written description shall prevail.

[0052] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An electric back-pushing bed frame, comprising a rectangular fixed frame and a rectangular movable frame. The outer side of the first cross bar of the rectangular fixed frame is hinged to the second cross bar of the rectangular movable frame. It is characterized in that: On the inner side of each of the two first longitudinal bars fixed to the first cross bar, there is a chute, and both ends of a sliding rod are slidably fitted in the two chutes; A first end and a second end of one end of an X-shaped driving frame with a hinge point as the intersection point are respectively hinged to one end of the first cross bar and one end of the sliding rod. A third end and a fourth end of the other end of the X-shaped driving frame are respectively in rolling fit through their respective first rollers in the roller chutes fixed to the inner side of the other end of the sliding rod and the inner side of the other end of the first cross bar. Both ends of a linear driving device are respectively hinged to the second end and the third end; One end of each of the two first lifting rods is hinged to both ends of the sliding rod, the other end of each of the two first lifting rods is hinged to the middle section of its respective second lifting rod, one end of each of the two second lifting rods is hinged to both ends of the inner side of the first cross bar, and the respective second rollers on the other end of each of the two second lifting rods are in rolling fit with the movable frame.

2. The electric back-pushing bed frame according to claim 1, wherein: The parts where both ends of the sliding rod are slidably fitted with the chutes are the outermost ends; the hinged parts of both ends of the sliding rod with the first lifting rods are located at the inner ends of the slidably fitted parts; the hinged part of the sliding rod with the second end is located at the inner end of the hinged part of the sliding rod with the first lifting rod, and the part of the sliding rod where the roller chute is fixed is located at the inner end of the hinged part of the sliding rod with the first lifting rod.

3. The electric back-pushing bed frame according to claim 1, characterized in that: The X-shaped driving frame is composed of two inclined plates hinged through a hinge pin at the intersection. The first end and the third end are located at both ends of one of the inclined plates, and the second end and the fourth end are located at both ends of the other inclined plate; the first end and the third end are arc-shaped plates extending outward and laterally from both ends of one inclined plate, and the second end and the fourth end are arc-shaped plates extending outward and laterally from both ends of the other inclined plate. The hinge points of the four ends are all on their respective arc-shaped plates.

4. The electric back-pushing bed frame according to claim 3, characterized in that: The linear driving device is an electric push rod; a reinforcing block extends from the inner side of the arc-shaped plate of the second end, and a reinforcing block also extends from the inner side of the arc-shaped plate of the third end. The tail end of the housing of the electric push rod is hinged to one of the reinforcing blocks, and the free end of the piston rod extending from the head end of the housing of the electric push rod is hinged to the other reinforcing block.

5. The electric back-pushing bed frame according to claim 1 or 4, characterized in that: The axes of the motor and the gearbox of the electric push rod are mutually at 90° with the axis of the housing of the electric push rod. At the corresponding position of the sliding rod and the tail ends of the motor and the gearbox of the electric push rod, there is an arcuate arm extending outward. The inner side of the arcuate arm forms a groove for accommodating the tail ends of the motor and the gearbox of the electric push rod.

6. The electric back-pushing bed frame according to claim 1, characterized in that: The axes of the pins for hinging both ends of the electric push rod are at the shortest distance from each other: the relative distance between the first cross bar and the sliding rod is the farthest, and the sliding rod is the closest to the fourth cross bar. The movable frame is parallel to the fixed frame and the thickness when they are placed flat is the thinnest.

7. The electric back push bed frame according to claim 1 or 6, characterized in that: The axes of the pins for hinging both ends of the electric push rod are at the longest distance from each other: the relative distance between the first cross bar and the sliding rod is the closest, and the sliding rod is the farthest from the fourth cross bar. The included angle between the movable frame and the fixed frame is the maximum back-raising angle, and the person is in a sitting position leaning on the movable frame.

8. The electric back-pushing bed frame according to claim 7, wherein: The state where the axial distances between the axes of the pin shafts used for hinging both ends of the electric push rod are between the shortest and the longest: the relative distance between the first cross bar and the sliding rod is between the closest and the farthest, the sliding rod and the fourth cross bar are between the farthest and the closest, the included angle between the movable frame and the fixed frame is less than the maximum backrest angle and greater than 0°, and when a person leans on the movable frame, it is in a semi-reclined state or a fully reclined state.

9. The electric back-pushing bed frame according to claim 1, characterized in that: The second rollers respectively on the other ends of the two second lifting rods are in rolling cooperation with two second longitudinal rods with one end fixed to the second cross bar and the other end fixed to the third cross bar.

Images