Anti-pinch electric bed

Abstract

The utility model relates to the field of electric beds, in particular to an anti-pinch electric bed. A bed board of an existing anti-pinch electric bed uses a single infrared sensor, the monitoring range is small, although the infrared sensor is matched with a capacitive sensor, the range is wide, but the cost is high, and therefore the anti-pinch electric bed comprises a bed frame, the bed board and a driving device. The bed plate is formed by splicing a fixed plate distributed in the length direction of the bed frame and a plurality of movable plates, infrared sensors are arranged on the lower surfaces of the movable plates, at least two infrared sensors are arranged on the movable plates with the infrared sensors, and the two infrared sensors monitor the side edge areas of the adjacent movable plates and the end areas of the movable plates on the same side respectively. According to the electric bed, the two or more infrared sensors are arranged on the lower surface of the movable plate, the two infrared sensors can monitor the adjacent plate side edge areas on the left side and the right side and the plate end area on the same side respectively, the left side, the right side and the end positions of the plate are prevented from being pinched, and the use safety of the electric bed is improved.

Description

Technical Field

[0001] The utility model relates to the field of electric beds, in particular to an anti-pinch electric bed. Background Art

[0002] Adjusting the angle of the bed plate of an electric bed can pose a safety hazard. When the bed plate encounters an obstacle during movement, it exerts a significant squeezing force on it, trapping the obstacle between the bed plate and the bed frame, potentially leading to a pinching accident. Existing anti-pinch designs for electric beds fall into two categories: one involves increasing the gap between the bed plates, designing slide rails, or adding limit blocks to the bed frame structure to reduce the risk of pinching; the other involves installing sensors on the bed plate to detect obstacles in areas where pinching may occur, thereby reducing the risk. Infrared sensing for anti-pinch technology can sensitively detect obstacles in real time and is widely used. Existing anti-pinch electric beds equipped with infrared sensors consist of a bed plate and a bed frame. The upper and lower bed plates can be raised relative to the bed frame for angle adjustment. As the angle between the bed plate and the horizontal plane is adjusted from high to low, pinching accidents are more likely to occur on both sides of the bed plate and at the far end where the range of motion is greatest. Furthermore, the risk area for pinching also changes within a certain range in sync with the angle of the bed plate.

[0003] The anti-pinch electric beds in existing patents also have the following shortcomings: 1. The prior patent "An Infrared Sensing Anti-pinch Electric Bed CN206910125U" uses a single infrared sensor to monitor the bed board area along the direction of bed board displacement. The infrared sensor is installed on the bottom of the mattress, but the width range of the bed board is not taken into consideration. In particular, the structure of the lower part of the electric bed is complex and there are many obstructing parts, and there will be blind spots for safety monitoring in actual use; 2. The prior patent "An Anti-pinch Electric Bed with Combined Sensor CN210581800U" which uses an infrared sensor in conjunction with a capacitive sensor to monitor anti-pinch installs the infrared sensor (i.e., a pyroelectric infrared sensor) on the inner side of the bed frame near the center of the bed frame. The infrared sensor can only monitor within an angle range of 100 to 120 degrees and cannot monitor all dangerous areas on the upper surface of the bed frame. Therefore, it is used in conjunction with a capacitive sensor to avoid monitoring blind spots. Capacitive sensors are more expensive, which increases the cost of electric beds. Furthermore, as the lifting angle of the electric bed board gradually decreases, the dangerous area with the risk of pinching will gradually move to the far end with a large range of movement. The infrared sensor of the fixed bed board lowers as the bed board is lowered, and the distance from the bed frame changes accordingly, and the monitoring range of the infrared sensor gradually decreases. Therefore, the installation position of the infrared sensor needs to be able to meet the need of covering the dangerous area within the monitoring range at different angles of the bed board. If the infrared sensor is installed too close to the edge of the bed frame or too close to the middle of the bed frame, the probability of invalid monitoring will increase and the safety of anti-pinch will be reduced. The existing technology lacks calibration for the installation position of the infrared sensor on the movable bed board. Utility Model Content

[0004] In order to solve the technical problems that the existing anti-pinch electric bed has a small monitoring range when using a single infrared sensor on the bed board, and the infrared sensor combined with a capacitive sensor has a wide range but high cost, the utility model provides an anti-pinch electric bed. By configuring at least two infrared sensors for the movable plate in the bed board, the monitoring range of the area prone to pinching is expanded while controlling the cost, thereby reducing the risk of pinching during the use of the electric bed; furthermore, the infrared sensor on the movable plate can be calibrated to a specific position through various methods such as side positioning or end positioning and a combination of the two positioning, thereby optimizing the monitoring of high-risk areas and improving the safety of the electric bed during use.

[0005] The present invention solves the technical problem by adopting a technical solution: an anti-pinch electric bed comprising a bed frame, a bed board, and a drive device. The bed board is composed of a fixed board distributed along the length of the bed frame and a plurality of movable boards. The lower surface of the movable board is provided with an infrared sensor. The utility model is characterized in that the movable board with the infrared sensor is provided with at least two infrared sensors, and the two infrared sensors each monitor adjacent side areas of the movable board and the end area of the movable board on the same side. By providing two or more infrared sensors on the lower surface of the movable board, the two infrared sensors each monitor adjacent side areas of the board on the left and right sides and the end area of the board on the same side, thereby preventing pinching accidents on the left and right sides and the end positions of the movable board, thereby improving the safety of the electric bed.

[0006] As a further improvement and supplement to the above-mentioned technical solution, the present invention employs the following technical measures: the movable board includes a front board at the headside that lifts the head and back, and a rear board at the footside that lifts the legs. Infrared sensors are located on the lower surfaces of the front and rear boards, each with at least two infrared sensors. The front and rear boards each have a dimension L1 parallel to the width of the bed frame, and dimensions L2 and L3, respectively, parallel to the length of the bed frame, with L3 being longer than L2. The front and rear boards of the movable board, respectively, lift the head and back of the upper body and the legs of the lower body, and each board has at least two infrared sensors for monitoring.

[0007] Preferably, the lower surfaces of the front and rear panels are each provided with at least one pair of two symmetrical side infrared sensors, each of which monitors the left and right side regions of the pointing panel and a portion of the end region on the same side. During use of the electric bed, the two symmetrical side infrared sensors on the same panel monitor the left and right side regions of the movable panel, which are prone to pinching accidents, and the end region on the same side. Combining the end regions monitored by the two infrared sensors on the same side enables monitoring of the entire end region.

[0008] Preferably, the side infrared sensors are located at a distance of 10% L1 to 25% L1 from the adjacent panel side edge, the side infrared sensors on the front panel are located at a distance of 24% L2 to 50% L2 from the panel edge at the head of the bed, and the side infrared sensors on the rear panel are located at a distance of 24% L3 to 50% L3 from the panel edge at the foot of the bed. The positioning of the corresponding side infrared sensors is optimized based on the planar dimensions of the movable panel on which they are located. Specifically, the spacing between each of the two side infrared sensors in the same group and the adjacent panel side edge and the panel edge at the head or foot of the bed is limited, so that the two symmetrical groups of side infrared sensors on the front and rear panels both monitor the left and right side areas prone to pinching and the corresponding end areas on the same side.

[0009] Preferably, the front and rear panels are each provided with at least one end infrared sensor on their respective lower surfaces. The end infrared sensors on the front and rear panels monitor the middle area of the front panel's end facing the head of the bed and the middle area of the rear panel's end facing the foot of the bed, respectively. The provision of end infrared sensors on each front and rear panel monitors the middle area of the end facing both the head and foot of the bed, thereby compensating for the inability of the left and right side infrared sensors alone to effectively monitor the middle area of the end when the bed board is wide. The two side infrared sensors and the end infrared sensor work together to monitor a wider area of the end, thereby preventing pinching accidents at both the head and foot of the bed.

[0010] Preferably, the distance between the end infrared sensor and the nearest left or right side edge of the corresponding movable panel is between 24% L1 and 50% L1, and the distance between the end infrared sensor and the panel edge at the head or foot end of the corresponding movable panel is between 10% L2 and 25% L2, or between 10% L3 and 25% L3, respectively. The installation position of the end infrared sensors on the two panels is optimized based on the planar dimensions of the movable panel. By limiting the distance between the end infrared sensors and the nearest panel edge, as well as the distance from the panel edge at the head or foot end, the end infrared sensors monitor the end areas of the panel that are prone to pinching during movement.

[0011] Preferably, the width of the bed board is greater than 1 meter, and the rear board is provided with a pair of two symmetrically angled infrared sensors on its lower surface. The infrared sensors are oriented obliquely outward to monitor the adjacent side edges and end areas of the rear board. When the bed board width exceeds 1 meter, the two symmetrical infrared sensors can be installed at an angle, with each symmetrically angled infrared sensor pointing obliquely outward to the adjacent side edges and end areas of the rear board. In particular, the range pointing toward the end areas can be extended toward the middle, thereby expanding the monitoring range.

[0012] The two oblique infrared sensors are each tilted at ±30° to the length of the electric bed and pointed outward. Each oblique infrared sensor monitors the area adjacent to the rear panel and the wider end area at a 30° angle to the length of the electric bed.

[0013] Preferably, the bed board is a double bed board formed by splicing together two single bed boards with a width of less than 1 meter, and each single bed board includes the front board and the back board. Each of the two front boards is provided with a set of two symmetrical side infrared sensors. The two side infrared sensors in the same set respectively monitor the left and right side areas and part of the end area on the same side of the front board. The two back boards are provided with a set of two symmetrical side infrared sensors and a set of two symmetrical end infrared sensors. The two side infrared sensors are respectively arranged on the outer sides of the two back boards, and the two end infrared sensors are respectively arranged on the ends of the two back boards corresponding to the foot of the bed. Two single bed boards with a width of less than 1 meter are spliced side by side to form a double bed board. Each single bed board has multiple infrared sensors on the front and back boards. The two front boards on the headboard side each have a set of infrared sensors, each set having two symmetrical side infrared sensors. The two side infrared sensors in the same set cooperate to monitor the left and right side areas and the end area on the headboard side of the front board. Since the conventional angle range of the legs of an electric bed is 0 to 40 degrees, when a mattress is installed on the electric bed, the risk of the connection between the upper and lower legs being pinched is relatively small, and only the sides and end areas of the end of the bed need to be monitored. Therefore, the infrared sensor is moved to a position close to the end of the bed to strengthen the safety monitoring of the end area of the bed. As a result, there are two groups of infrared sensors on the two back panels on the end side of the bed. One group has two symmetrical side infrared sensors, which are arranged on the two side back panels to monitor the outer side areas of the two back panels and part of the end area of the back panels; the other group has two symmetrical end infrared sensors, which are also arranged on the two side back panels and on the end side close to the end of the bed to monitor the adjacent end areas of the two back panels.

[0014] Preferably, the back panel is composed of a first back panel for lifting the thighs and a second back panel for lifting the calves, and the infrared sensor on the back panel is located on the lower surface of the second back panel. The back panel is composed of two movably connected first and second back panels, with the second back panel located at the end of the entire bed corresponding to the foot of the bed. The infrared sensors on the back panels are all located on the second back panel to monitor the side and end areas of the second back panel where pinching injuries are likely to occur.

[0015] The beneficial technical effects of this utility model include: by installing two or more infrared sensors on the lower surface of the movable deck, monitoring the adjacent left and right edge areas and the end area of the deck on the same side, the monitoring range is expanded, preventing pinching accidents on the left and right sides and ends of the movable deck, and improving the safety of electric beds. Furthermore, the infrared sensors are calibrated and adjusted based on the length and width of the bed board and the angle at which the deck board is lifted, to monitor the optimal position of the bed board to monitor the dangerous area, further enhancing the anti-pinch safety of the electric bed during use. The utility model is suitable for monitoring the needs of single and double beds and has a wide range of applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 : Schematic diagram of the structure of the electric bed described in Example 1.

[0017] Figure 2 : A plan view of the lower surface of the bed board described in Example 1.

[0018] Figure 3 : A plan view of the lower surface of the bed board described in Example 2.

[0019] Figure 4 : A plan view of the lower surface of the bed board described in Example 3.

[0020] Figure 5 : A plan view of the lower surface of the bed board described in Example 4.

[0021] In the figure: 1. Bed frame, 2. Drive device, 3. Infrared sensor, 31. Side infrared sensor, 32. End infrared sensor, 33. Oblique infrared sensor, 4. Movable plate, 41. Front plate, 42. Back plate, 421. First back plate, 422. Second back plate, 5. Fixing plate, 51. Lumbar fixing plate, 52. Hip fixing plate, 6. Bed legs. DETAILED DESCRIPTION

[0022] The present invention will be further described below with reference to the accompanying drawings and specific implementation methods.

[0023] like Figure 1 As shown, the utility model is an anti-pinch electric bed, which includes a bed frame 1, a bed board and a driving device 2. The bed frame is supported by bed legs 6 arranged at the bottom. The bed board is composed of two fixed boards 5 and three movable boards 4 distributed along the length direction of the bed frame 1. An infrared sensor 3 is provided on the lower surface of the movable board 4. At least two infrared sensors 3 are provided on the movable board 4 with the infrared sensor. The two infrared sensors 3 respectively monitor the adjacent side area of the movable board 4 and the end area of the movable board 4 on the same side.

[0024] By setting two or more infrared sensors on the lower surface of the movable board, these two infrared sensors respectively monitor the adjacent board side areas on the left and right sides and the board end areas on the same side, preventing pinching accidents on the left and right sides and end positions of the movable board, and improving the safety of electric bed use.

[0025] The infrared sensor is adjusted and calibrated according to the length and width of the bed board and the lifting angle of the bed board and installed at the preferred position of the bed board to monitor the dangerous area, so that the dangerous areas where pinching may occur are covered by the monitoring range of the infrared sensor, further improving the anti-pinch safety during the use of the electric bed. The position of the infrared sensor can be adjusted to adapt to the different monitoring needs of single beds and double beds, and has a wide range of applications.

[0026] The present invention has a variety of embodiments of different infrared sensor installation methods, and four embodiments are described below as examples.

[0027] Example 1 Figure 2 As shown, the three movable panels are a front panel 41 at the head end for lifting the head and a rear panel 42 at the foot end for lifting the legs. The rear panel 42 is composed of a first rear panel 421 and a second rear panel 422, which are movably connected. The first and second rear panels support the thighs and calves, respectively. In this and other embodiments, the infrared sensors provided on the rear panel 42 are located on the lower surface of the second rear panel 422. The two fixed panels are a waist support panel 51 and a hip support panel 52, which support the hips. All infrared sensors 3 are located on the lower surfaces of the front panel 41 and the rear panel 42, with each panel having at least two infrared sensors 3 for monitoring. The dimensions of the front panel 41 and the rear panel 42 parallel to the width of the bed frame 1 are both L1 = 817 mm. The dimensions of the front panel 41 and the rear panel 42 parallel to the length of the bed frame 1 are L2 = 674.5 mm and L3 = 734.5 mm, respectively. As shown in the figure, L3 is longer than L2.

[0028] As shown in the figure, the lower surfaces of the front and rear panels 41, 42 are each provided with at least one pair of two symmetrical side infrared sensors 31. In this embodiment, each panel has a pair of two symmetrical side infrared sensors 31, for a total of four infrared sensors installed on the bed board. The two side infrared sensors 31 on the same panel monitor the left and right side areas of the panel and a portion of the end area on the same side. The two side infrared sensors 31 on the front panel are positioned horizontally between 10% L1 and 25% L1 from the adjacent panel side edge, representing 150 mm in the figure, or approximately 18% L1. Vertically, they are positioned between 24% L2 and 50% L2 from the panel end edge at the head of the bed, representing 330 mm in the figure, or approximately 49% L2. The two side infrared sensors 31 on the rear panel 42 are located at a lateral distance of 10% L1 to 25% L1 from the adjacent panel side edge, which is 110 mm in the figure, or approximately 13% L1; and a vertical distance of 24% L3 to 50% L3 from the panel edge at the tail end of the bed, which is 265 mm in the figure, or approximately 36% L3.

[0029] Example 2 Figure 3 As shown, the bed board has the same size as that of Example 1, and there are four side infrared sensors 31 set in the same position on the front and rear plates. The difference is that the front plate 41 and the rear plate 42 are further provided with at least one end infrared sensor 32 on their respective lower surfaces. In this embodiment, there is one end infrared sensor 32 on each of the front plate 41 and the rear plate 42. The two end infrared sensors 32 respectively monitor the middle area of the end pointing to the head side of the front plate 41 and the middle area of the end pointing to the foot side of the rear plate 42, further expanding the monitoring of the middle area of the end to prevent pinching accidents.

[0030] The end infrared sensor 32 on the front panel is positioned horizontally between 24% L1 and 50% L1 from the nearest panel edge (410 mm in the figure, approximately 50% L1). The end infrared sensor 32 on the rear panel 42 is positioned horizontally between 24% L1 and 50% L1 from the nearest panel edge (410 mm in the figure, approximately 50% L1). The end infrared sensor 32 on the rear panel 42 is positioned vertically between 10% L3 and 25% L3 from the nearest panel edge (125 mm in the figure, approximately 17% L3).

[0031] Example 3 Figure 4As shown, the width L1 of the bed board is greater than 1 meter, and in this embodiment, L1=1050 mm. The other dimensions of the various parts of the bed board are the same as those in Example 1. There is also a group of two symmetrical side infrared sensors on the lower surface of the front board. The installation position range of the side infrared sensors is the same as that in Example 1, and the specific installation position is different from that in Example 1. The side infrared sensor is 120 mm away from the adjacent side edge of the board in the horizontal direction in the figure, which is about 11% of L1; the vertical distance from the board end edge at the head end is 330 mm in the figure, which is about 49% of L2. In addition, the lower surface of the rear plate of Example 3 is not provided with a side infrared sensor. Instead, a group of two oblique infrared sensors 33 that are symmetrically installed on the left and right are provided. Both infrared sensors are pointed obliquely outward. The two oblique infrared sensors 33 are tilted at ±30° to the length direction of the electric bed and are pointed obliquely outward. The oblique infrared sensor on the left side of the figure is tilted at +30° in a clockwise direction to the length direction of the electric bed, and the oblique infrared sensor on the right side is tilted at -30° in a counterclockwise direction to the length direction of the electric bed. The two oblique infrared sensors monitor the side area adjacent to the rear plate and the wider end area obliquely outward.

[0032] The two oblique infrared sensors 33 on the rear panel 42 are 195 mm in the horizontal direction from the adjacent panel side edge in the figure, which is about 19% L1; and 210 mm in the vertical direction from the panel end edge at the end of the bed, which is about 28% L3.

[0033] Example 4 Figure 5 As shown, the bed board is a double bed board formed by splicing two single bed boards with a width of less than 1 meter. The width of the single bed board is L1. Each single bed board includes the front board 41 and the back board 42 and the waist fixing board 51 and the hip fixing board 52. The two front boards 41 are each provided with a group of two symmetrical side infrared sensors 31. The two side infrared sensors 31 in the same group respectively monitor the side areas on the left and right sides of the front board 41 and part of the end area on the same side. The two side infrared sensors 31 in the same group are 150 mm away from the adjacent board side in the horizontal direction in the figure, which is about 18% L1; the vertical distance from the board end edge at the head end is 330 mm in the figure, which is about 49% L2.

[0034] The two back panels 42 are equipped with a set of two symmetrical side infrared sensors 31 and a set of two symmetrical end infrared sensors 32. The two side infrared sensors 31 are located on the outer sides of the two back panels 42, while the two end infrared sensors 32 are located on the ends of the two back panels 42 corresponding to the foot of the bed. The two side infrared sensors 31 in the same set are 110 mm (approximately 13% L1) laterally from the adjacent panel side edge, and 265 mm (approximately 32% L2) vertically from the end of the panel edge. The two end infrared sensors 32 in the same set are located in the middle area between the two single bedding units. Each end infrared sensor is 195 mm (approximately 24% L1) laterally from the nearest panel side edge, and 125 mm (approximately 17% L3) vertically from the end of the panel edge.

Claims

1. An anti-pinch electric bed, comprising a bed frame (1), a bed board and a driving device (2), wherein the bed board is composed of a fixed plate (5) distributed along the length direction of the bed frame (1) and a plurality of movable plates (4) spliced together, and an infrared sensor (3) is provided on the lower surface of the movable plate (4), and is characterized in that The movable plate (4) with infrared sensors (3) is provided with at least two infrared sensors (3), and the two infrared sensors (3) respectively monitor the adjacent side area of the movable plate (4) and the end area of the movable plate (4) on the same side.

2. The anti-pinch electric bed according to claim 1, characterized in that The movable plate (4) comprises a front plate (41) for lifting the head and back on the head side and a rear plate (42) for lifting the legs on the foot side. The infrared sensors (3) are respectively arranged on the lower surfaces of the front plate (41) and the rear plate (42), and the front plate (41) and the rear plate (42) each have at least two infrared sensors (3). The dimensions of the front plate (41) and the rear plate (42) in the width direction parallel to the bed frame (1) are both L1. The dimensions of the front plate (41) and the rear plate (42) in the length direction parallel to the bed frame (1) are L2 and L3 respectively, and the length of L3 is greater than the length of L2.

3. The anti-pinch electric bed according to claim 2, characterized in that The lower surfaces of the front plate (41) and the rear plate (42) are each provided with at least one set of two symmetrical side infrared sensors (31), and the two side infrared sensors (31) respectively monitor the side areas on the left and right sides of the pointing plate and part of the end area on the same side.

4. The anti-pinch electric bed according to claim 3, characterized in that The side infrared sensor (31) is at a distance of 10% L1 to 25% L1 from the adjacent side edge of the board, the side infrared sensor (31) on the front board (41) is at a distance of 24% L2 to 50% L2 from the board edge at the head end of the bed, and the side infrared sensor (31) on the rear board (42) is at a distance of 24% L3 to 50% L3 from the board edge at the tail end of the bed.

5. The anti-pinch electric bed according to claim 2, characterized in that The front plate (41) and the rear plate (42) are each provided with at least one end infrared sensor (32) on their respective lower surfaces. The end infrared sensors (32) on the front plate (41) and the rear plate (42) respectively monitor the middle area of the end of the front plate (41) on the head side of the bed and the middle area of the end of the rear plate (42) on the foot side of the bed.

6. The anti-pinch electric bed according to claim 5, characterized in that The distance between the end infrared sensor (32) and the nearest side edge of the left and right sides of the corresponding movable plate (4) is between 24% L1 and 50% L1, and the distance between the end infrared sensor (32) and the board end edge of the corresponding movable plate (4) at the head end or the foot end of the bed is between 10% L2 and 25% L2 or between 10% L3 and 25% L3 respectively.

7. The anti-pinch electric bed according to claim 2, characterized in that The width of the bed board is greater than 1 meter, and the rear plate (42) is provided with a group of two oblique infrared sensors (33) installed in a symmetrical manner on its lower surface. The oblique infrared sensors (33) are pointed obliquely outward to monitor the adjacent side areas of the rear plate (42) and part of the end area of the rear plate (42).

8. The anti-pinch electric bed according to claim 7, characterized in that The two oblique infrared sensors (33) are respectively inclined at ±30° to the length direction of the electric bed and pointed obliquely outwards.

9. The anti-pinch electric bed according to claim 2, characterized in that The bed board is a double bed board formed by splicing two single bed boards with a width of less than 1 meter, and the single bed boards all include the front board (41) and the back board (42). The two front boards (41) are each provided with a group of two symmetrical side infrared sensors (31). The two side infrared sensors (31) in the same group respectively monitor the side areas on the left and right sides of the front board (41) and part of the end area on the same side. The two back boards (42) are provided with a group of two symmetrical side infrared sensors (31) and a group of two symmetrical end infrared sensors (32). The two side infrared sensors (31) are respectively arranged on the outer sides of the two back boards (42), and the two end infrared sensors (32) are respectively arranged on one side of the end of the two back boards (42) corresponding to the foot of the bed.

10. The anti-pinch electric bed according to any one of claims 2 to 9, characterized in that The back plate (42) is formed by movably connecting a first back plate (421) for lifting the thigh and a second back plate (422) for lifting the calf. The infrared sensor on the back plate (42) is arranged on the lower surface of the second back plate (422).

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