Load sensing device

Abstract

This utility model relates to a load-bearing sensing device, comprising: a base, a movable component, a sensor, and an elastic component. The movable component is configured to support a load-bearing carrier and is movable relative to the base, moving closer to or away from the base. The sensor is connected to the base or the movable component and is located on the movement trajectory of the movable component. The elastic component is disposed on the base and connected to the movable component. The load-bearing sensing device has a triggered state and a deactivated state. When there is a load on the load-bearing carrier, and the weight of the load is sufficient to deform the elastic component, driving the movable component to move closer to the base and triggering the sensor, the load-bearing sensing device is in the triggered state. When there is no load on the load-bearing carrier, the deformation of the elastic component returns to normal, driving the movable component to move away from the base and preventing the sensor from being triggered, the load-bearing sensing device is in the deactivated state.

Description

Technical Field

[0001] This utility model relates to the field of intelligent monitoring technology, and more specifically, to a load-bearing sensing device. Background Technology

[0002] Currently, the mainstream elderly care methods include three main categories: home-based care, community-based care, and institutional care. In all three, it is crucial to monitor the elderly person's nighttime bed-getting and bed-returning habits to reduce the occurrence of accidents such as falls, sudden illnesses, or confusion. Traditional methods rely on caregivers or family members making regular rounds or phone inquiries, which have drawbacks such as high labor costs, poor timeliness, disturbance to the elderly person's rest, and difficulty in covering the late-night hours.

[0003] Existing technology discloses a bed-leaving sensing device, which includes a bed-leg fixing tray, a pressure sensor fixing tray, and a footrest arranged sequentially. The bed-leg fixing tray is used to fix the bed legs, the pressure sensor fixing tray holds a pressure sensor, and the footrest supports the bed on the ground. Specifically, the weight of the bed and the bed itself creates pressure, which is distributed on the bed legs. This pressure is then applied to the pressure sensor through the bed-leg fixing tray, and the pressure sensor obtains continuous pressure values. The device then determines whether the elderly person has left the bed by judging whether the change in pressure value exceeds a threshold. However, this type of bed-leaving sensing device requires continuous monitoring of changes in the bed-leg pressure value, resulting in high system power consumption and requiring a continuous power supply. This leads to drawbacks such as high operating costs, difficult implementation, difficult maintenance, and limited adoption. Furthermore, the pressure change range at the bed legs is large when the elderly person leaves or returns to bed. Due to the performance limitations of the pressure sensor itself and interference from environmental factors, the measurement of pressure changes may be inaccurate, leading to misjudgments of whether the elderly person has left or returned to bed. Utility Model Content

[0004] The purpose of this utility model is to provide a load-bearing sensing device, which solves the technical problem of how to detect the elderly getting out of bed and returning to bed in a low-cost, easy-to-implement and maintenance-free manner, and reduce the occurrence of false judgments.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution.

[0006] This utility model provides a load-bearing sensing device, comprising: a base; a movable member configured to support a load-bearing carrier and movable relative to the base, the movable member moving closer to or away from the base; a sensor connected to the base or the movable member and located on the movement trajectory of the movable member; and an elastic member disposed on the base and connected to the movable member. The load-bearing sensing device has a triggered state and a disconnected state. When there is a load on the load-bearing carrier, and the weight of the load is sufficient to deform the elastic member to drive the movable member closer to the base, and the movable member or the base triggers the sensor, the load-bearing sensing device is in the triggered state. When there is no load on the load-bearing carrier, the deformation of the elastic member returns to normal, driving the movable member away from the base, and the movable member or the base does not trigger the sensor, the load-bearing sensing device is in the disconnected state.

[0007] In some embodiments of this application, the sensor is connected to the base, and the movable part moves to move closer to or away from the sensor; in the triggered state, the movable part moves closer to and triggers the sensor; in the disconnected state, the movable part moves away without triggering the sensor.

[0008] In some embodiments of this application, the elastic element, the movable element, and the sensor are arranged sequentially in the horizontal direction. One end of the elastic element is connected to the base, the movable element is arranged in an arc shape, the middle part of the movable element is hinged to the base, the first end of the movable element is connected to the other end of the elastic element, and the second end of the movable element is used to support the load-bearing carrier and to trigger the sensor.

[0009] In some embodiments of this application, the load-bearing sensing device further includes an adjusting member, one end of the elastic member is connected to the base through the adjusting member, and the adjusting member and the base are movably connected along the horizontal direction.

[0010] In some embodiments of this application, the adjusting member includes a screw and a nut seat. The screw extends along the horizontal direction and is rotatably disposed on the base. The nut seat is screwed into the screw and connected to one end of the elastic member.

[0011] In some embodiments of this application, a contact piece is provided on the second end of the movable member, and the second end of the movable member triggers the sensor through the contact piece.

[0012] In some embodiments of this application, the sensor is provided with a pressure plate and a contact point. The pressure plate is located above the contact point and has elasticity to drive it away from the contact point. When the contact piece is driven by the second end of the movable member to approach and press down on the pressure plate so that the pressure plate abuts against the contact point, the contact piece can trigger the sensor.

[0013] In some embodiments of this application, the sensor includes a pressure plate and a mercury angle switch. The pressure plate has an elasticity that drives it upward and makes it at an angle to the horizontal. The mercury angle switch is connected to the pressure plate and is located below the pressure plate. When the contact plate is driven by the second end of the movable member to approach and press down on the pressure plate to make the pressure plate horizontal and drive the mercury angle switch to change position, the contact plate can trigger the sensor.

[0014] In some embodiments of this application, the contact piece is Z-shaped and includes a first contact portion, a second contact portion, and a third contact portion. The first contact portion and the second contact portion extend in opposite directions and are staggered. The third contact portion is connected to the first contact portion and the second contact portion respectively. The first contact portion is disposed on the second end of the movable member and is in contact with the top surface of the movable member. The second contact portion is used to trigger the sensor.

[0015] In some embodiments of this application, the load-bearing sensing device is a bed-off sensing device, the load-bearing carrier is a bed, the bed is used to support the human body, and the movable component is used to support the bed legs upwards.

[0016] As can be seen from the above technical solution, the embodiments of this utility model have at least the following advantages and positive effects:

[0017] In the load-bearing sensing device of this embodiment, in the initial state, there is no load on the load-bearing carrier, the elastic element is in a preset pre-tightened state, and the physical connection between the base, the elastic element, and the movable element allows the movable element to remain away from the base. When there is a load on the load-bearing carrier, and the weight of the load causes the elastic element to deform, driving the movable element closer to the base, and triggering the sensor by the movable element or the base, the load-bearing sensing device enters the triggered state. At this time, the load-bearing sensing device can output a signal indicating load. When the load is removed from the load-bearing carrier, the deformation force accumulated in the elastic element begins to release, and the deformation force drives the movable element away from the base to complete the reset, so that the sensor is no longer triggered. At this time, the load-bearing sensing device switches from the triggered state to the disconnected state and outputs a signal indicating no load. Thus, through the coordinated cooperation between the base, sensor, movable element, and elastic element, the load-bearing sensing device has the function of monitoring whether a load is being carried.

[0018] Specifically, in elderly care monitoring scenarios, the load-bearing carrier is the bed. The base is placed on the ground, and the movable parts support the bed legs. This arrangement ensures that the weight of the bed distributed across the bed legs is applied to the movable parts of the weight-bearing sensor. Initially, the movable parts only bear the weight of the bed itself distributed across the bed legs. When the elderly person lies down or returns to bed, the additional weight from their body is transferred through the bed and bed legs to the movable parts, triggering the weight-bearing sensor. At this time, the sensor outputs a signal indicating that someone is present. When the elderly person gets out of bed, their weight is removed, causing the weight-bearing sensor to switch from the triggered state to the deactivated state, and the sensor outputs a signal indicating that no one is present.

[0019] Therefore, this load-bearing sensing device can accurately address the binary judgment requirements of leaving and returning to bed in elderly care monitoring. Compared with existing technologies that rely on judging whether the pressure value change of a pressure sensor exceeds a threshold, this invention eliminates the need for constant power supply, significantly reducing overall power consumption. This allows for low-cost, easy-to-implement, and maintenance-free detection of elderly individuals leaving and returning to bed, and is easily adopted. Furthermore, its judgment logic is simpler and clearer, avoiding the adverse effects of pressure sensor limitations and external environmental interference, and filtering out interference from minute gravity changes. This effectively reduces misjudgments of elderly individuals leaving and returning to bed, resulting in high accuracy and reliability. Attached Figure Description

[0020] The various objectives, features, and advantages of this invention will become more apparent from the following detailed description of preferred embodiments in conjunction with the accompanying drawings. The drawings are merely illustrative illustrations of the invention and are not necessarily drawn to scale. In the drawings, the same reference numerals always denote the same or similar parts. Wherein:

[0021] Figure 1 This is a structural schematic diagram of a load-bearing sensing device in a triggered state, according to an exemplary embodiment.

[0022] Figure 2 yes Figure 1 A schematic diagram of the structure in the disconnected state.

[0023] Figure 3 yes Figure 1 Top view after removing the elastic element and load-bearing carrier.

[0024] The annotations in the attached figures are explained as follows:

[0025] 1. Base; 11. First connecting seat; 12. Second connecting seat;

[0026] 2. Sensor; 21. Press; 22. Contact;

[0027] 3. Moving part; 31. First end; 32. Second end; 321. Contact piece; 3211. First contact portion; 3212. Second contact portion; 3213. Third contact portion;

[0028] 4. Elastic components;

[0029] 5. Adjusting component; 51. Screw; 511. First limiting part; 512. Second limiting part; 52. Nut seat.

[0030] 6. Load-bearing carrier. Detailed Implementation

[0031] Although the present invention can be readily embodied in various forms, only some specific embodiments are shown in the accompanying drawings and will be described in detail in this specification. It is understood that this specification should be regarded as an exemplary illustration of the principles of the present invention and is not intended to limit the present invention to what is described herein.

[0032] Therefore, a feature pointed out in this specification is used to describe one feature of one embodiment of the present invention, and does not imply that every embodiment of the present invention must have the described feature. Furthermore, it should be noted that this specification describes many features. Although certain features may be combined to illustrate possible system designs, these features may also be used in other combinations not explicitly stated. Therefore, unless otherwise stated, the described combinations are not intended to be limiting.

[0033] In the embodiments shown in the accompanying drawings, the directional indications (such as up, down, left, right, front, and back) used to explain the structure and movement of the various elements of this invention are relative rather than absolute. These descriptions are appropriate when these elements are in the positions shown in the drawings. If the descriptions of the positions of these elements change, these directional indications also change accordingly.

[0034] Please see Figures 1 to 3The load-bearing sensing device provided in one embodiment of this utility model mainly includes a base 1, a sensor 2, a movable member 3, and an elastic member 4. The movable member 3 is configured to support a load-bearing carrier 6 and can move relative to the base 1, moving closer to or further away from the base 1. The sensor 2 is connected to the base 1 or the movable member 3 and is located on the movement trajectory of the movable member 3. The elastic member 4 is disposed on the base 1 and connected to the movable member 3. The load-bearing sensing device has a triggered state and a disconnected state. When there is a load on the load-bearing carrier 6, and the weight of the load is sufficient to deform the elastic member 4, driving the movable member 3 to move closer to the base 1, and causing the movable member 3 or the base 1 to trigger the sensor 2, the load-bearing sensing device is in the triggered state. When there is no load on the load-bearing carrier 6, the deformation of the elastic member 4 returns to normal, driving the movable member 3 to move away from the base 1, and causing the movable member 3 or the base 1 not to trigger the sensor 2, the load-bearing sensing device is in the disconnected state.

[0035] In the load-bearing sensing device of this embodiment, in the initial state, there is no load on the load-bearing carrier 6, and the elastic element 4 is in a preset pre-tightened state. The physical connection between the base 1, the elastic element 4, and the movable element 3 allows the movable element 3 to remain away from the base 1. When there is a load on the load-bearing carrier 6, and the weight of the load causes the elastic element 4 to deform, driving the movable element 3 closer to the base 1, and triggering the sensor 2 by the movable element 3 or the base 1, the load-bearing sensing device enters the triggered state. At this time, the load-bearing sensing device can output a signal indicating that it is carrying a load. When the load is removed from the load-bearing carrier 6, the deformation force accumulated in the elastic element 4 begins to be released. The deformation force drives the movable element 3 away from the base 1 to complete the reset, so that the sensor 2 is no longer triggered. At this time, the load-bearing sensing device switches from the triggered state to the disconnected state and outputs a signal indicating that it is not carrying a load. Thus, through the coordinated cooperation between the base 1, the sensor 2, the movable element 3, and the elastic element 4, the load-bearing sensing device has the function of monitoring whether it is carrying a heavy load.

[0036] Specifically, in the elderly care monitoring scenario, the load-bearing carrier 6 is the bed. Specifically, the base 1 is placed on the ground, and the movable component 3 supports the bed legs. This arrangement allows the weight of the bed distributed across the bed legs to be applied to the movable component 3 of the load-bearing sensor. Initially, the movable component 3 only bears the weight of the bed itself distributed across the bed legs. When the elderly person lies down or returns to bed, the additional weight from their body is transferred through the bed and bed legs to the movable component 3, triggering the load-bearing sensor. At this time, the signal output by the load-bearing sensor indicates that someone is present. When the elderly person gets out of bed, their weight is removed from the bed, switching the load-bearing sensor from the triggered state to the deactivated state, and the signal output by the load-bearing sensor indicates that no one is present. Therefore, this load-bearing sensing device can accurately address the binary judgment requirements of leaving and returning to bed in elderly care monitoring. Compared with existing technologies that rely on judging whether the pressure value change of a pressure sensor exceeds a threshold, this invention significantly reduces overall power consumption by eliminating the need for constant power supply. It enables the detection of elderly people leaving and returning to bed in a low-cost, easy-to-implement, and maintenance-free manner, and is easily adopted. Furthermore, its judgment logic is simpler and clearer, avoiding the adverse effects of pressure sensor limitations and external environmental interference, and filtering out interference from minute gravity changes. This effectively reduces misjudgments of elderly people leaving and returning to bed, resulting in high accuracy and reliability.

[0037] It should be noted that when sensor 2 is connected to base 1, the movement of movable part 3 towards base 1 can bring it closer to sensor 2, and the movement of movable part 3 away from base 1 can move it away from sensor 2.

[0038] It is conceivable that, depending on the elderly person's bedridden habits, the load-bearing sensor can be arranged in various ways, including but not limited to, installing it on one of the bed legs, on two bed legs that are diagonally distributed, or on all four bed legs. In the preferred usage scenario, two load-bearing sensors can be installed on the two bed legs that are diagonally distributed.

[0039] It should be noted that this load-bearing sensor can be applied not only in elderly care monitoring scenarios but also in other scenarios. For example, it can be applied in hotel management by installing the sensor on the foot of the bed in a hotel room. By monitoring the load-bearing capacity of the bed, the actual usage of the hotel room can be monitored, which can reduce the number of unregistered guests and thus improve the hotel's management efficiency and security.

[0040] It should be noted that, in addition to monitoring whether there is someone on the bed, this load-bearing sensor can also be applied to other furniture or equipment, such as sofas and chairs. Specifically, by installing the load-bearing sensor on the legs of a sofa or chair, it can monitor the load-bearing capacity of the sofa or chair, thereby enabling the assessment of the elderly person's daily life and living conditions in various home scenarios.

[0041] Therefore, the load-bearing sensing device of this utility model is not limited to use in elderly care monitoring scenarios, nor is it limited to use in conjunction with the foot of the bed.

[0042] Please see Figure 1 and Figure 2 In the first embodiment of this utility model, the sensor 2 is connected to the base 1, and the movable part 3 moves to approach or move away from the sensor 2. In the triggered state, the movable part 3 moves closer to and triggers the sensor 2. In the disconnected state, the movable part 3 moves away and does not trigger the sensor 2. The base 1 is a relatively fixed structure, making the process of assembling the sensor 2 onto it relatively quick and simple. Furthermore, the base 1 provides a stable working environment for the sensor 2, ensuring that the sensor 2 can stably cooperate with the movable part 3, thereby improving the stability of the load-bearing sensing device.

[0043] In one embodiment where the sensor 2 is connected to the base 1, the movable member 3 can rotate relative to the base 1, and the movable member 3 can rotate relative to the base 1 to move closer to or further away from the sensor 2. The rotational movement has a clear and fixed trajectory, and does not require an additional positioning device to guide its movement direction, thereby simplifying the complexity of the overall structure and reducing management and maintenance costs.

[0044] In one embodiment where the movable component 3 can rotate relative to the base 1, the elastic component 4, the movable component 3, and the sensor 2 are arranged sequentially in the horizontal direction. One end of the elastic component 4 is connected to the base 1. The movable component 3 is arranged in an arc shape, with its middle section hinged to the base 1. The first end 31 of the movable component 3 is connected to the other end of the elastic component 4, and the second end 32 of the movable component 3 is used to support the load-bearing carrier 6 and to trigger the sensor 2. The middle section of the movable component 3 is hinged to the base 1, thus forming a lever structure. The first end 31 and the second end 32 of the movable component 3 are located at the two ends of the lever, respectively. Since the first end 31 and the second end 32 cooperate with the elastic component 4 and the sensor 2, respectively, a practical and effective power transmission structure can be established between the elastic component 4, the movable component 3, and the sensor 2. The arc shape of the movable component 3 can form a smooth curve transition, which can evenly distribute the load-bearing pressure to the entire component, ensuring the durability of the structure.

[0045] It is conceivable that the movable part 3 is arranged in an arc shape, and its opening can face upward or downward. In this embodiment, the movable part 3 is set with its opening facing upward. This method facilitates its arrangement, reduces the space requirements below the movable part 3, and makes the overall structure more stable and reliable.

[0046] Please see Figures 1 to 3 In a specific embodiment, the load-bearing sensing device further includes an adjusting member 5. One end of the elastic member 4 is connected to the base 1 through the adjusting member 5, and the adjusting member 5 and the base 1 are movably connected in the horizontal direction.

[0047] Since the two ends of the elastic element 4 are connected to the first end 31 of the adjusting element 5 and the movable element 3 respectively, the horizontal movement of the adjusting element 5 can cause changes in the state of the elastic element 4 and the movable element 3. Specifically, the movement of the adjusting element 5 away from the sensor 2 is transmitted to the movable element 3 through the elastic element 4, causing the second end 32 of the movable element 3, which supports the load-bearing carrier 6, to rotate away from the sensor 2. When the distance between the second end 32 of the movable element 3 and the sensor 2 increases, the elastic element 4 has a larger deformation stroke, which is suitable for scenarios where the initial weight of the load-bearing carrier 6 or the weight of the load on the load-bearing carrier 6 is large. Therefore, it is necessary to increase the initial weight of the load-bearing carrier 6 or the weight of the load on the load-bearing carrier 6 in order to trigger the sensor 2. Similarly, when the adjusting member 5 moves closer to the sensor 2, the distance between the second end 32 of the movable member 3 and the sensor 2 decreases, and the deformation stroke of the elastic member 4 also decreases accordingly. This is suitable for scenarios where the initial weight of the load-bearing carrier 6 or the weight of the load on the load-bearing carrier 6 is relatively small. Therefore, the weight requirement for triggering the sensor 2 based on the initial weight of the load-bearing carrier 6 or the weight of the load on the load-bearing carrier 6 is reduced. In summary, by simply and cleverly setting the adjusting member 5, it is possible to adapt to different initial weights of the load-bearing carrier 6 or the weight of the load on the load-bearing carrier 6.

[0048] Therefore, this load-bearing sensing device can adapt to beds of different weights and elderly people of different weights to meet the personalized needs of elderly care monitoring. For example, in scenarios where the bed itself is heavy, firstly, move the adjusting member 5 away from the sensor 2 and press the second end 32 of the movable member 3 under the bed foot. If the movable member 3 triggers the sensor 2 due to the weight of the bed itself, then the adjusting member 5 needs to be adjusted and moved away from the sensor 2 until the movable member 3 no longer triggers the sensor 2 due to the weight of the bed itself. Then, depending on the weight of the elderly person, if the elderly person is light and cannot trigger the sensor 2 by moving the movable member 3 while lying in bed, then the adjusting member 5 needs to be adjusted in the opposite direction and moved closer to the sensor 2 until the elderly person can trigger the sensor 2 by moving the movable member 3 while in bed, thus ensuring that the elderly person's bedridden state can be captured. Similarly, for scenarios where the bed itself is light, the adjusting member 5 needs to be moved closer to the sensor 2 first, and the remaining steps are similar. The specific application scenarios need to be adjusted in accordance with the actual bed and the user's situation, which will not be listed here.

[0049] It is conceivable that, through the coordinated operation of the base 1, the adjusting component 5, the elastic component 4, and the movable component 3, timely adjustments can be made based on the weight changes caused by the same elderly person becoming fat or thin, so as to ensure that the load-bearing sensing device can accurately monitor bed rest and bed ambulation.

[0050] Therefore, the introduction of the adjusting component 5 can greatly improve the versatility and applicability of the load-bearing sensing device.

[0051] Please see Figures 1 to 3 In a specific embodiment, the adjusting member 5 includes a screw 51 and a nut seat 52. The screw 51 extends horizontally and is rotatably mounted on the base 1. The nut seat 52 is screwed into the screw 51 and connected to one end of the elastic member 4. By rotating the head of the screw 51, the screw 51 can be rotated, causing the nut seat 52 to move horizontally to both sides, thus changing the position of the elastic member 4 and the movable member 3. This adjusts the distance between the second end 32 of the movable member 3 and the sensor 2. By converting the action of rotating the screw 51 into the horizontal displacement of the nut seat 52, the horizontally movable characteristic of the adjusting member 5 is achieved. This has the advantages of high adjustment accuracy and good stability. Moreover, this structure is simple and reliable, easy to manufacture, install and maintain, and highly adaptable, thus being able to adapt to the initial weight of different load-bearing carriers 6 or the different weights of the loads on the load-bearing carriers 6.

[0052] In this embodiment, the elastic element 4 is a tension spring. The first end 31 of the movable element 3 and the nut seat 52 are respectively provided with mounting holes. Both ends of the tension spring have hooks. The two hooks are hooked onto the first end 31 of the movable element 3 and the nut seat 52 through the mounting holes, which facilitates disassembly and assembly for replacement or maintenance. In this embodiment, the elastic force can also be adjusted by replacing the elastic element 4 with different specifications to adapt to more usage scenarios.

[0053] In this embodiment, the base 1 is provided with a first connecting seat 11 and a second connecting seat 12 arranged at intervals along a horizontal direction. The first connecting seat 11 has a first rotating hole, and the second connecting seat 12 has a second rotating hole. The screw 51 is rotatably inserted into the first rotating hole and the second rotating hole. The two ends of the screw 51 are respectively provided with a first limiting part 511 with a size larger than the first rotating hole and a second limiting part 512 with a size larger than the second rotating hole. The first limiting part 511 and the second limiting part 512 are both located outside the first connecting seat 11 and the second connecting seat 12 to restrict the screw 51 from coming out of the first connecting seat 11 and the second connecting seat 12 from the horizontal direction, thereby ensuring the feasibility and reliability of the overall structure of the adjusting member 5.

[0054] The above embodiments show an ideal scenario where the load-bearing carrier 6 is unloaded, considering only the presence or absence of people. In actual use, there may be pets on the bed or clothes and items piled on the bed. These situations cause additional weight to be transferred to the movable part 3 through the bed legs, resulting in slight movement of the movable part 3 towards the sensor 2. However, such slight movement should not be interpreted as someone being present. Specifically, by selecting the elastic element 4 or changing the relative horizontal position of the adjusting element 5 and the base 1, the additional weight added to the bed must reach a certain value to trigger the sensor 2. For example, this weight value can be adjusted to around 30 kg, while the weight of a human body generally exceeds this value.

[0055] Please see Figures 1 to 3 In a specific embodiment, a contact piece 321 is provided on the second end 32 of the movable member 3, and the second end 32 of the movable member 3 triggers the sensor 2 through the contact piece 321.

[0056] The arrangement of the contact piece 321 can separate the load-bearing position of the second end 32 and the mating position between the second end 32 and the sensor 2, thereby improving the reliability of the contact.

[0057] Please see Figure 1 and Figure 2In one embodiment where the sensor 2 is triggered by the second end 32 of the movable member 3 via the contact piece 321, the sensor 2 is provided with a pressure plate 21 and a contact 22. The pressure plate 21 is located above the contact 22 and has elasticity to drive it away from the contact 22. When the contact piece 321 is driven by the second end 32 of the movable member 3 to approach and press down on the pressure plate 21 so that the pressure plate 21 abuts against the contact 22, the contact piece 321 can trigger the sensor 2.

[0058] Signal triggering is achieved through mechanical contact between contact piece 321, pressure plate 21, and contact 22, which has the advantages of simple and reliable structure and low overall power consumption. The elastic design of pressure plate 21 can avoid false triggering. Pressure plate 21 will only make contact with contact 22 when sufficient pressure is applied to contact piece 321, thereby ensuring the accuracy of sensing.

[0059] In another embodiment where the sensor 2 is triggered by the second end 32 of the movable member 3 via the contact piece 321, the sensor 2 includes a pressure plate 21 and a mercury angle switch. The pressure plate 21 has an elasticity that drives it upward and makes it at an angle to the horizontal. The mercury angle switch is connected to the pressure plate 21 and is located below the pressure plate 21. When the contact piece 321 is driven by the second end 32 of the movable member 3 to approach and press down on the pressure plate 21 so that the pressure plate 21 is in a horizontal state and drives the mercury angle switch to change position, the contact piece 321 can trigger the sensor 2.

[0060] When unloaded, the pressure plate 21 remains tilted due to its own elasticity, and the mercury in the mercury angle switch is located on the side away from the electrode, separated from it. When a load is applied, the second end 32 of the moving part 3 presses down on the contact piece 321, forcing the pressure plate 21 to overcome the elastic force and become horizontal. At this time, the mercury in the mercury angle switch flows towards the electrode under gravity and forms a path with the electrode, thus triggering the sensor 2. Signal triggering is achieved through the mechanical contact between the contact piece 321 and the contact point 22, and the positional change of the mercury within the mercury angle switch. This method has the advantages of simple and reliable structure and low overall power consumption.

[0061] In other embodiments, the sensor 2 includes a transmitter and a receiver arranged horizontally opposite each other. When the contact piece 321 is driven by the second end 32 of the movable member 3 to approach the sensor 2 and extend downward between the transmitter and the receiver, the contact piece 321 can trigger the sensor 2.

[0062] When the contact piece 321 is driven by the second end 32 of the movable member 3 to approach the sensor 2 and extend between the transmitter and receiver, it blocks the signal emitted by the transmitter, preventing the receiver from receiving the signal. At this time, the contact piece 321 can trigger the sensor 2. This sensing method adopts the non-contact photoelectric sensing principle, which has the advantages of fast response speed, high sensitivity and no mechanical wear. However, compared with the previous two implementation methods, the overall power consumption is higher. Therefore, in this utility model, the two implementation methods mentioned above are the preferred implementation methods in which the second end 32 of the movable member 3 triggers the sensor 2 through the contact piece 321.

[0063] Please see Figure 1 and Figure 2 In a specific embodiment, the contact piece 321 is Z-shaped and includes a first contact portion 3211, a second contact portion 3212 and a third contact portion 3213. The first contact portion 3211 and the second contact portion 3212 extend in opposite directions and are staggered. The third contact portion 3213 is connected to the first contact portion 3211 and the second contact portion 3212 respectively. The first contact portion 3211 is disposed on the second end 32 of the movable member 3 and is in contact with the top surface of the movable member 3. The second contact portion 3212 is used to trigger the sensor 2.

[0064] The Z-shaped or similar Z-shaped design of the contact piece 321 can better adapt to the structure and movement of the moving part 3. While making the connection between the contact piece 321 and the moving part 3 more secure, it can also ensure that the contact piece 321 can accurately trigger the sensor 2 through the second contact part 3212, thereby improving the overall stability and reliability of the device.

[0065] In another embodiment where the movable component 3 can rotate relative to the base 1, the movable component 3 and the sensor 2 are arranged sequentially in the same horizontal direction. The movable component 3 is arranged in an arc shape, and its middle part is hinged to the base 1. When the movable component 3 rotates relative to the base 1, it can drive its first end 31 away from or towards the sensor 2. The first end 31 of the movable component 3 is provided with a contact piece 321, which is used to trigger the sensor 2. The second end 32 of the movable component 3 is used to support the load-bearing carrier 6. The elastic component 4 is a tension spring or a torsion spring, and its two ends are respectively connected to the movable component 3 and the base 1. The middle part of the movable component 3 is hinged to the base 1, thereby forming a lever structure. The first end 31 and the second end 32 of the movable component 3 are respectively located at the two ends of the lever. Since the first end 31 and the second end 32 cooperate with the sensor 2 and the load-bearing carrier 6 respectively, a practical and effective power transmission structure can be established between the elastic component 4, the movable component 3, and the sensor 2. The movable part 3 is arc-shaped, which can form a smooth curve transition and evenly distribute the load-bearing pressure to the entire component, ensuring the durability of the structure.

[0066] When the elastic element 4 is a torsion spring, it is sleeved outside the rotation center of the base 1 and the movable element 3, and its two ends abut against the movable element 3 and the base 1 respectively. When the elastic element 4 is a tension spring, it is set in accordance with the manner described in the above embodiments, and will not be repeated here.

[0067] On the other hand, torsion springs and tension springs, as elastic elements 4, have the advantages of simple structure and convenient installation, and can provide stable elastic force.

[0068] In a further embodiment, the sensor 2 is provided with a pressure plate 21 and a contact 22. The pressure plate 21 is located below the contact 22 and has elasticity to drive it away from the contact 22. When the contact piece 321 is driven by the first end 31 of the movable member 3 to approach and push upward against the pressure plate 21, so that the pressure plate 21 abuts against the contact 22, the contact piece 321 can trigger the sensor 2. Signal triggering is achieved through mechanical contact between the contact piece 321, the pressure plate 21, and the contact 22, which has the advantages of simple and reliable structure and low cost. The elastic design of the pressure plate 21 can avoid false triggering. The pressure plate 21 will only contact the contact 22 when sufficient pressure is applied to the contact piece 321, thereby ensuring the accuracy of sensing.

[0069] In other embodiments, the sensor 2 includes a pressure plate 21 and a mercury angle switch. The pressure plate 21 has an elasticity that drives it downward and makes it at an angle to the horizontal. The mercury angle switch is connected to the pressure plate 21 and is located above the pressure plate 21. When the contact piece 321 is driven by the second end 32 of the movable member 3 to approach and push upward against the pressure plate 21, so that the pressure plate 21 is in a horizontal state and drives the mercury angle switch to change position, the contact piece 321 can trigger the sensor 2. The signal triggering is achieved through the mechanical contact between the contact piece 321 and the contact point 22, and the position change of the mercury in the mercury angle switch. It has the advantages of simple and reliable structure and low overall power consumption.

[0070] In the second embodiment of this utility model, the sensor 2 is mounted on the movable member 3, which moves to move the sensor 2 closer to or away from the base 1. In the triggered state, the movable member 3 moves and moves the sensor 2 closer to the base 1, causing the base 1 to trigger the sensor 2. In the disconnected state, the movable member 3 moves and moves the sensor 2 away from the base 1, preventing the base 1 from triggering the sensor 2. This embodiment is feasible, but because the movable member 3 is movable, the mechanical vibration and impact generated by its movement may affect the sensor 2 and interfere with its normal operation, thereby affecting the stability of the load-bearing sensing device. Therefore, the first embodiment described above is the preferred embodiment of this utility model.

[0071] Specifically, this embodiment can be obtained by exchanging the positions of the sensor 2 and the contact piece 321 in the above embodiments, and the specific structures of the base 1, sensor 2, movable member 3, elastic member 4 and adjusting member 5 can be set with reference to the above embodiments, which will not be described in detail here.

[0072] In the above embodiments, the load-bearing sensing device further includes a control system and a display terminal. The sensor 2 is configured to output a closed signal and an open signal respectively when the moving part 3 triggers and does not trigger the sensor 2. The controller receives the closed signal and the open signal, processes them into a signal indicating load bearing and a signal indicating no load bearing respectively, and finally displays them on the display terminal. Specifically, in this embodiment, the signal indicating load bearing is output as "bedridden", and the signal indicating no load bearing is output as "out of bed".

[0073] In the above embodiments, the load-bearing sensing device is a bed-off sensing device, the load-bearing carrier 6 is a bed, the bed is used to support the human body, and the movable part 3 is used to support the bed legs upward.

[0074] Although the present invention has been described with reference to several typical embodiments, it should be understood that the terminology used is descriptive and exemplary, and not restrictive. Since the present invention can be embodied in many forms without departing from the spirit or essence of the invention, it should be understood that the above embodiments are not limited to any of the foregoing details, but should be interpreted broadly within the spirit and scope defined by the appended claims. Therefore, all variations and modifications falling within the scope of the claims or their equivalents should be covered by the appended claims.

Claims

1. A load-bearing sensing device for installation on a load-bearing carrier, characterized in that, include: Base; A movable component is configured to support the load-bearing carrier and is movable relative to the base, the movable component moving closer to or further away from the base; The sensor is connected to the base or the movable component and is located on the movement trajectory of the movable component; An elastic element, one end of which is connected to the base and the other end of which is connected to the movable element, wherein the elastic element is a tension spring or a torsion spring; The load-bearing sensing device has a triggered state and a disconnected state; When there is a load on the load-bearing carrier, and the weight of the load is sufficient to deform the elastic element to drive the movable element to move closer to the base, and the movable element or the base triggers the sensor, the load-bearing sensing device is in the triggered state. When there is no load on the load-bearing carrier, the elastic element recovers its deformation to drive the movable element away from the base, and the load-bearing sensing device is in the disconnected state when the movable element or the base does not trigger the sensor.

2. The load-bearing sensing device according to claim 1, characterized in that, The sensor is connected to the base, and the movable part moves to move closer to or away from the sensor; In the triggered state, the movable part moves closer to and triggers the sensor; In the disconnected state, the moving part moves away without triggering the sensor.

3. The load-bearing sensing device according to claim 2, characterized in that, The elastic element, the movable element, and the sensor are arranged in sequence in the horizontal direction. The movable element is arranged in an arc shape. The middle part of the movable element is hinged to the base. The first end of the movable element is connected to the other end of the elastic element. The second end of the movable element is used to support the load-bearing carrier and to trigger the sensor.

4. The load-bearing sensing device according to claim 3, characterized in that, It also includes an adjusting member, one end of which is connected to the base via the adjusting member, and the adjusting member and the base are movably connected along the horizontal direction.

5. The load-bearing sensing device according to claim 4, characterized in that, The adjusting component includes a screw and a nut seat. The screw extends along the horizontal direction and is rotatably mounted on the base. The nut seat is screwed into the screw and connected to one end of the elastic element.

6. The load-bearing sensing device according to claim 3, characterized in that, The second end of the movable component is provided with a contact piece, and the second end of the movable component triggers the sensor through the contact piece.

7. The load-bearing sensing device according to claim 6, characterized in that, The sensor is provided with a pressure plate and a contact. The pressure plate is located above the contact and has elasticity to drive it away from the contact. When the contact piece is driven by the second end of the movable member to approach and press down on the pressure plate so that the pressure plate abuts against the contact, the contact piece can trigger the sensor.

8. The load-bearing sensing device according to claim 6, characterized in that, The sensor includes a pressure plate and a mercury angle switch. The pressure plate has an upward elasticity and is at an angle to the horizontal. The mercury angle switch is connected to the pressure plate and is located below the pressure plate. When the contact plate is driven by the second end of the movable member to approach and press down on the pressure plate, so that the pressure plate is in a horizontal state and causes the mercury angle switch to change position, the contact plate can trigger the sensor.

9. The load-bearing sensing device according to claim 6, characterized in that, The contact piece is Z-shaped and includes a first contact portion, a second contact portion, and a third contact portion. The first contact portion and the second contact portion extend in opposite directions and are staggered. The third contact portion is connected to the first contact portion and the second contact portion respectively. The first contact portion is located on the second end of the movable member and is in contact with the top surface of the movable member. The second contact portion is used to trigger the sensor.

10. The load-bearing sensing device according to any one of claims 1-9, characterized in that, The load-bearing sensing device is a bed-off sensing device, the load-bearing carrier is the bed, the bed is used to support the human body, and the movable part is used to support the bed legs upward.

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