Seat height measuring device and seat base

Abstract

The present invention relates to a seat height measuring device and a seat base, wherein the seat height measuring device comprises an outer frame, an inner frame, an angle sensor and a rotation angle magnifying device, wherein the inner frame is arranged in the outer frame, the angle sensor is fixedly connected to the inner frame, the rotation angle magnifying device is arranged in the inner frame, the rotation angle magnifying device is drivingly connected to the angle sensor, and an elastic buffer device is arranged between the inner frame and the outer frame, and the elastic buffer device performs movement buffering when the inner frame moves relative to the outer frame. According to the technical solution provided by the present invention, the problem of center of gravity offset caused by wear of the rotating shaft is solved, the measurement accuracy of the seat height measuring device is improved, and the service life of the seat height measuring device is extended.

Description

Technical Field

[0001] The invention belongs to the technical field of automobile seats, and in particular relates to a seat height measuring device and also to a seat base. Background Art

[0002] In order to improve the riding comfort, the driver's seat on the car is usually provided with a pneumatic seat base, thus forming an air suspension seat. The base can not only adjust the height of the seat according to the driver's needs, but also play a role in shock absorption in the up and down directions during driving. When encountering bumpy roads, the airbag in the base is adaptively inflated or exhausted to maintain the predetermined height of the seat and filter the high-frequency vibration of the car body. The seat base in the prior art usually includes an upper seat frame, a hinge frame, a lower seat frame, an airbag, a switch valve and other components. The hinge frame can be deformed during the seat lifting process. An intermediate connecting shaft is provided in the middle of the hinge frame, and a roller shaft (rotating shaft) is provided at the end.

[0003] In the prior art, in order to collect the height information of the air suspension seat, some technical solutions set an angle sensor on the hinge frame and set a lever device with two lever arms, one end of which is connected to the angle sensor and the other end is connected to the lower frame of the seat. When the height of the seat changes, the lever device drives the angle sensor, thereby transmitting the angle change of the hinge frame to the angle sensor, and the controller converts the angle information collected by the angle sensor into height information. This seat height measurement device including an angle sensor occupies a lot of space and is prone to interference with other components.

[0004] Since the angle of the hinge changes during the lifting and lowering of the seat, the angle of the rotating shaft connected to the hinge also changes accordingly. In some technical solutions, an angle sensor is arranged on the rotating shaft at the rear lower part of the seat. When the height of the seat changes, the angle change of the rotating shaft is transmitted to the angle sensor, and the controller converts the angle information collected by the angle sensor into height information. However, during the use of the seat, the connection between the rotating shaft and the lower frame of the seat will inevitably wear out, and the center of gravity of the rotating shaft will continue to move downward as the degree of wear increases, further increasing the mutual wear between the rotating shaft and the lower frame of the seat. Since the angle sensor is fixedly connected to the lower frame of the seat, the rotating shaft coincides with the rotating axis of the angle sensor. As the center of gravity of the rotating shaft continues to move downward relative to the lower frame of the seat, the rotating shaft deviates from the rotating axis of the angle sensor, which not only reduces the measurement accuracy of the angle sensor, but also damages the components inside the angle sensor. Summary of the invention

[0005] In order to solve all or part of the above problems, the purpose of the present invention is to provide a seat height measuring device, which effectively overcomes the problem of center of gravity deviation caused by wear of the rotating shaft by providing an elastic buffer device.

[0006] The present invention also aims to provide a seat base, which is equipped with the above-mentioned seat height measuring device.

[0007] On the one hand, the present invention provides a seat height measuring device, including an outer frame, an inner frame, an angle sensor and a rotation angle magnification device, wherein the inner frame is arranged in the outer frame, the angle sensor is fixedly connected to the inner frame, the rotation angle magnification device is arranged in the inner frame, the rotation angle magnification device is drivingly connected to the angle sensor, and an elastic buffer device is arranged between the inner frame and the outer frame, and the elastic buffer device performs movement buffering when the inner frame moves relative to the outer frame.

[0008] Optionally, the elastic buffer device is arranged on the outer side wall of the inner frame, and is clamped between the outer side wall of the inner frame and the inner side wall of the outer frame.

[0009] Optionally, the elastic buffer device comprises a rubber ring, an inner ring of the rubber ring is elastically connected to the outer side wall of the inner frame, and an outer ring of the rubber ring is elastically connected to the inner side wall of the outer frame.

[0010] Optionally, the elastic buffer device includes a plurality of springs, one end of each spring is elastically connected to the outer side wall of the inner frame, and the other end of each spring is elastically connected to the inner side wall of the outer frame.

[0011] Optionally, a plurality of external protrusions are provided on the outer ring of the rubber ring, and the external protrusions are elastically connected to the inner side wall of the outer frame.

[0012] Optionally, the rotation angle amplification device includes a first transmission shaft, a second transmission shaft, a first gear and a second gear, the first transmission shaft is coaxially fixed with the first gear, the second transmission shaft is coaxially fixed with the second gear, the first gear and the second gear are meshingly transmitted, the radius of the first gear is larger than that of the second gear, the first transmission shaft is drivingly connected to the rotating shaft of the seat base, and the second transmission shaft is drivingly connected to the angle sensor.

[0013] Optionally, the outer frame includes a first outer frame and a second outer frame, the first outer frame and the second outer frame are detachably combined, the second outer frame is fixedly connected to the seat frame of the seat base, the first transmission shaft passes through the second outer frame and is drivingly connected to the rotating shaft of the seat base, the second outer frame is provided with through holes corresponding to the first transmission shaft and the second transmission shaft, and a gap is provided between the inner wall of the through hole and the outer circle of the first transmission shaft and the second transmission shaft.

[0014] Optionally, a circuit board is disposed in the first outer frame, the circuit board is fixedly connected to the second outer frame, the circuit board is electrically connected to the angle sensor, a conduction interface is disposed on the circuit board, and a jack is disposed on the first outer frame corresponding to the conduction interface.

[0015] Optionally, the rear end of the second outer frame is provided with an opening, the inner frame is inserted into the second outer frame through the opening, and the opening is provided with a limiting plate to limit the inner frame.

[0016] On the other hand, the present invention provides a seat base, including an upper seat frame, a gallows and a lower seat frame, the gallows is X-shaped, a first rotating shaft is arranged at the front hinge between the gallows and the upper seat frame, a third rotating shaft is arranged at the rear hinge, a second rotating shaft is arranged at the front hinge between the gallows and the lower seat frame, a fourth rotating shaft is arranged at the rear hinge, the position of the second rotating shaft or the fourth rotating shaft on the lower seat frame is fixed, and can rotate relative to the lower seat frame, and also includes the seat height measuring device mentioned above, the seat height measuring device is arranged on the lower seat frame and is drivingly connected to the second rotating shaft or the fourth rotating shaft, and detects the rotation angle of the second rotating shaft or the fourth rotating shaft during the lifting and lowering process of the upper seat frame.

[0017] Optionally, limiting devices are respectively provided at both ends of the second rotating shaft or the fourth rotating shaft, the limiting devices are fixed to the lower seat frame, the second rotating shaft or the fourth rotating shaft is rotatable in the limiting devices, and the limiting devices include limiting support blocks or bearings.

[0018] Optionally, the limiting support block comprises an upper half block and a lower half block which are combined together, and the upper half block and the lower half block are combined together by bolts.

[0019] Optionally, a limiting groove is arranged in the limiting support block along the axial direction of the second rotating axis or the fourth rotating axis, the axial end of the second rotating axis or the fourth rotating axis is arranged in the limiting groove, a protruding tenon is arranged in the limiting groove along the radial direction of the second rotating axis or the fourth rotating axis, and a radially recessed groove is correspondingly arranged at the axial end of the second rotating axis or the fourth rotating axis.

[0020] It can be seen from the above technical solution that the seat height measuring device provided by the present invention has the following advantages:

[0021] The present invention provides a buffer device to perform movement buffering for the rotation angle magnifying device. The rotation angle magnifying device is drivingly connected to the rotating shaft. When the center of gravity of the rotating shaft moves as the degree of wear increases (radial movement along the rotating shaft), the elastic buffer device can allow the rotation angle magnifying device to move with the rotating shaft and can also perform movement buffering for the rotation angle magnifying device, thereby effectively avoiding axial deviation between the rotating shaft and the rotation angle magnifying device and reducing the wear of the rotating shaft, thereby improving the measurement accuracy of the seat height measuring device and extending the service life of the seat height measuring device.

[0022] The seat base provided by the present invention has the following advantages:

[0023] The present invention simplifies the structure of the seat height measuring device in the prior art by arranging the seat height measuring device on the lower seat frame and drivingly connecting the seat height measuring device with the rotating shaft, reduces space occupation, and avoids interference with other components. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A three-dimensional diagram of a seat base in an embodiment of the present invention;

[0025] Figure 2 for Figure 1 A magnified view of section A;

[0026] Figure 3 A three-dimensional diagram of a seat base in an embodiment of the present invention (excluding the sheet metal parts in the lower seat frame);

[0027] Figure 4 for Figure 3 A magnified view of part B in FIG.

[0028] Figure 5 for Figure 3 The enlarged view of the C section in FIG.

[0029] Figure 6 An exploded view of a first position-limiting support block of a seat base in an embodiment of the present invention;

[0030] Figure 7 A three-dimensional diagram of the lower half of the first position-limiting support block of the seat base in an embodiment of the present invention;

[0031] Figure 8 A three-dimensional diagram of a seat height measuring device in an embodiment of the present invention;

[0032] Fig. 9 A three-dimensional diagram of a seat height measuring device in an embodiment of the present invention (without the first outer frame);

[0033] Fig.10 Another stereoscopic diagram of the seat height measuring device in the embodiment of the present invention (without the first outer frame);

[0034] Fig.11 It is an assembly stereogram of a second outer frame and an inner frame of a seat height measuring device according to an embodiment of the present invention;

[0035] Fig.12 is a three-dimensional diagram of an inner frame of a seat height measuring device in an embodiment of the present invention;

[0036] Fig.13 An exploded view of an inner frame of a seat height measuring device according to an embodiment of the present invention;

[0037] Fig.14 4 is a three-dimensional diagram of a rubber ring of a seat height measuring device in an embodiment of the present invention.

[0038] Description of reference numerals:

[0039] 1. Upper seat frame; 2. Gallows; 2-1. Support rod; 2-2. First rotating shaft; 2-3. Second rotating shaft; 2-4. Third rotating shaft; 2-5. Fourth rotating shaft; 2-5-1. Axis hole; 2-5-2. Slot; 3. Lower seat frame; 4. Seat height measuring device; 4-1. First outer frame; 4-2. Second outer frame; 4-3. Connecting ear plate; 4-4. Connecting ear plate; 4-5. Transmission interface; 4-6. First transmission shaft; 4-7. Circuit board; 4-8. Angle sensor; 4-9. Limit plate; 4-10, inner frame; 4-10-1, slot; 4-10-2, flange; 4-11, rubber ring; 4-11-1, ring body; 4-11-2, outer protrusion; 4-11-3, inner protrusion; 4-12, second transmission shaft; 4-13, first gear; 4-14, second gear; 5, first limit support block; 5-1, upper half block; 5-2, lower half block; 5-3, bolt; 5-4, limit slot; 5-5, tenon; 5-6, connecting hole; 5-7, positioning column; 6, slide slot; 7, second limit support block. DETAILED DESCRIPTION

[0040] In order to better understand the purpose, structure and function of the present invention, a seat height measuring device and a seat base of the present invention are further described in detail below in conjunction with the accompanying drawings.

[0041] Example 1

[0042] like Figure 8 , Fig. 9 , Fig.10 , Fig.11 , Fig.12The embodiment 1 of the present invention is shown, in which a seat height measuring device 4 is disclosed, including an outer frame, an inner frame 4-10, an angle sensor 4-8 and a rotation angle magnifying device, the inner frame 4-10 is arranged in the outer frame, the angle sensor 4-8 is fixedly connected to the inner frame 4-10, the rotation angle magnifying device is arranged in the inner frame 4-10, the rotation angle magnifying device is drivingly connected to the angle sensor 4-8, an elastic buffer device is arranged between the inner frame 4-10 and the outer frame, and when the inner frame 4-10 moves relative to the outer frame, the elastic buffer device performs movement buffering on the inner frame 4-10.

[0043] The rotation angle magnifying device can magnify the rotation angle of the measured target object to improve the measurement sensitivity and accuracy. The target object is usually a rotating shaft in the seat base. The rotating shaft will rotate simultaneously during the lifting and lowering process of the seat base, and the rotation angle is transmitted to the angle sensor 4-8 through the rotation angle magnifying device.

[0044] When the seat height measuring device 4 is in use, the outer frame is fixed. Since the rotation angle magnifying device is arranged in the inner frame 4-10 and is fixed relative to the inner frame 4-10, and the angle sensor 4-8 is also fixed relative to the inner frame 4-10, when the center of gravity of the rotating shaft moves as the degree of wear increases (moves radially along the rotating shaft), the rotation angle magnifying device will be driven to move, and the inner frame 4-10 will move at the same time. The elastic buffer device can allow the inner frame 4-10 to move with the rotating shaft, and can also buffer the movement of the inner frame 4-10, that is: the elastic buffer device can allow the rotation angle magnifying device to move with the rotating shaft, and can also buffer the movement of the rotation angle magnifying device, effectively avoiding the axis deviation between the rotating shaft and the rotation angle magnifying device, and reducing the wear of the rotating shaft, thereby improving the measurement accuracy of the seat height measuring device and extending the service life of the seat height measuring device.

[0045] like Fig.12 , Fig.13 As shown, the inner frame 4-10 is a rounded rectangle, and the elastic buffer device is arranged on the outer side wall of the inner frame 4-10 and clamped between the outer side wall of the inner frame 4-10 and the inner side wall of the outer frame. No matter which direction the inner frame 4-10 moves relative to the outer frame (moving radially along the rotation axis), the elastic buffer device can play a role in movement buffering.

[0046] like Fig.14As shown, in one embodiment, the elastic buffer device includes a rubber ring 4-11, the rubber ring 4-11 includes a ring body 4-11-1, and a plurality of outer protrusions 4-11-2 are arranged on the outer ring of the ring body 4-11-1, the inner ring of the ring body 4-11-1 is elastically connected to the outer side wall of the inner frame 4-10, and the outer protrusions 4-11-2 are elastically connected to the inner side wall of the outer frame. By providing a plurality of outer protrusions 4-11-2, it can not only play a buffering role, but also facilitate the installation of the inner frame 4-10 into the outer frame. When the inner frame 4-10 moves relative to the outer frame (moves radially along the rotation axis), the outer protrusions 4-11-2 and the ring body 4-11-1 will be compressed, and the outer protrusions 4-11-2 and the ring body 4-11-1 can perform movement buffering.

[0047] The inner ring of the ring body 4-11-1 is provided with an inner ring protrusion 4-11-3, and a corresponding card groove 4-10-1 is provided on the outer wall of the inner frame 4-10. The rubber ring 4-11 is fixedly connected with the outer wall of the inner frame 4-10, and the rubber ring 4-11 can maintain a fixed position on the outer wall of the inner frame 4-10.

[0048] In one embodiment, the elastic buffer device includes a plurality of springs, one end of which is elastically connected to the outer side wall of the inner frame 4-10, and the other end is elastically connected to the inner side wall of the outer frame. The setting position of the spring can refer to the outer protrusion 4-11-2, and a positioning column or a positioning hook can be set on the outer side wall of the inner frame 4-10 and the inner side wall of the outer frame corresponding to each spring, so that the spring will be positioned and maintained in a fixed position. When the inner frame 4-10 moves relative to the outer frame (moves radially along the rotation axis), the spring will be compressed or stretched, and the spring can perform movement buffering.

[0049] like Fig.12 , Fig.13 As shown, the rotation angle magnification device includes a first transmission shaft 4-6, a second transmission shaft 4-12, a first gear 4-13 and a second gear 4-14. The first transmission shaft 4-6 is fixed coaxially with the first gear 4-13, the second transmission shaft 4-12 is fixed coaxially with the second gear 4-14, the first gear 4-13 and the second gear 4-14 are meshed for transmission, the radius of the first gear 4-13 is greater than the radius of the second gear 4-14, the first transmission shaft 4-6 is drivingly connected to the rotation shaft of the seat base, and the second transmission shaft 4-12 is drivingly connected to the angle sensor 4-8. The first gear 4-13 and the second gear 4-14 can be sector gears or full gears, and the second gear 4-14 is preferably a full gear. The meshing transmission ratio of the first gear 4-13 and the second gear 4-14 must ensure the measurement sensitivity and accuracy of the rotation angle magnification device.

[0050] The front end wall and the rear end wall of the inner frame 4-10 support the first transmission shaft 4-6 and the second transmission shaft 4-12 to rotate. In order to improve the supporting strength, the front end wall and the rear end wall of the inner frame 4-10 are provided with flanges corresponding to the first transmission shaft 4-6 and the second transmission shaft 4-12, such as Fig.12 As shown, two flanges are provided on the rear end wall of the inner frame 4-10, such as Fig.13 As shown, two flanges 4-10-2 are provided on the front end wall of the inner frame 4-10. The first transmission shaft 4-6 extends from the front end wall of the inner frame 4-10 to the rotating shaft of the seat base, and the second transmission shaft 4-12 extends from the rear end wall of the inner frame 4-10 to the angle sensor 4-8. In order to facilitate the drive connection, the connecting end of the first transmission shaft 4-6 is prismatic, and the shaft end of the rotating shaft is correspondingly provided with a shaft hole. The connecting end of the first transmission shaft 4-6 can be inserted into the shaft hole to realize the drive connection. The drive connection between the second transmission shaft 4-12 and the angle sensor 4-8 can also refer to this structure.

[0051] like Figure 8 , Fig. 9 As shown, the outer frame includes a first outer frame 4-1 and a second outer frame 4-2. The first outer frame 4-1 and the second outer frame 4-2 can be detachably combined, such as a snap-on combination or a screw combination, to facilitate disassembly and assembly.

[0052] The outer frame is fixedly connected to the seat frame of the seat base, specifically, it can be fixedly connected to the seat frame of the seat base through the second outer frame 4-2, the first transmission shaft 4-6 passes through the second outer frame 4-2 and is drivingly connected to the rotating shaft of the seat base, and the second outer frame 4-2 is provided with a through hole on the front end wall corresponding to the first transmission shaft 4-6 and the second transmission shaft 4-12. The through hole is oblong and is designed to avoid the first transmission shaft 4-6 and the second transmission shaft 4-12. A gap is provided between the inner wall of the through hole and the outer circle of the first transmission shaft 4-6 and the second transmission shaft 4-12. When the inner frame 4-10 moves relative to the outer frame, the second outer frame 4-2 will not hinder the movement of the inner frame 4-10 due to the effect of the through hole.

[0053] When two flanges 4-10-2 are provided on the front end wall of the inner frame 4-10 corresponding to the first transmission shaft 4-6 and the second transmission shaft 4-12, if the flanges 4-10-2 also extend into the through hole, a gap must be provided between the inner wall of the through hole and the outer circle of the two flanges 4-10-2, so that when the inner frame 4-10 moves relative to the outer frame, the second outer frame 4-2 will not hinder the movement of the inner frame 4-10 due to the effect of the through hole.

[0054] In order to facilitate the installation of the seat height measuring device 4, connecting ear plates 4-3 and connecting ear plates 4-4 are provided on both sides of the second outer frame 4-2. Oblong mounting holes are provided on the connecting ear plates 4-3 and 4-4. The seat height measuring device 4 is fixed to the sheet metal of the seat frame by screws passing through the oblong mounting holes. The provision of the oblong mounting holes facilitates installation alignment.

[0055] like Fig. 9 , Fig.10 As shown, a circuit board 4-7 is provided in the first outer frame 4-1, the circuit board 4-7 is fixedly connected to the second outer frame 4-2, the circuit board 4-7 is electrically connected to the angle sensor 4-8, a conduction interface 4-5 is provided on the circuit board 4-7, and a jack is provided on the first outer frame 4-1 corresponding to the conduction interface 4-5. The circuit board 4-7 can process the detection signal of the angle sensor 4-8, transmit the detection signal to the outside through the conduction interface 4-5, and can also transmit electric energy to the circuit board 4-7 through the conduction interface 4-5.

[0056] The second outer frame 4-2 extends four legs toward the circuit board 4-7, and the circuit board 4-7 is fixed to the four legs by screws. There is a space between the circuit board 4-7 and the second outer frame 4-2, and the space can accommodate components such as the angle sensor 4-8 and the conductive interface 4-5.

[0057] The rear end of the second outer frame 4-2 is provided with an opening, and the inner frame 4-10 is inserted into the second outer frame 4-2 through the opening, and a limiting plate 4-9 is provided at the opening to limit the inner frame 4-10. The limiting plate 4-9 is fixedly connected with the second outer frame 4-2 to facilitate the disassembly and assembly of the inner frame 4-10.

[0058] The seat height measuring device of this embodiment has the following advantages:

[0059] By setting a buffer device, the rotation angle magnifying device can be buffered in movement. The rotation angle magnifying device is connected to the rotating shaft drive. When the center of gravity of the rotating shaft moves as the degree of wear increases (radial movement along the rotating shaft), the elastic buffer device can allow the rotation angle magnifying device to move with the rotating shaft and can also buffer the movement of the rotation angle magnifying device, effectively avoiding axial deviation between the rotating shaft and the rotation angle magnifying device and reducing the wear of the rotating shaft, thereby improving the measurement accuracy of the seat height measuring device and extending the service life of the seat height measuring device.

[0060] Example 2

[0061] like Figure 1 , Figure 3As shown, this embodiment discloses a seat base, including an upper seat frame 1, a gallows 2 and a lower seat frame 3, the gallows 2 is X-shaped, a first rotating shaft 2-2 is arranged at the front hinge between the gallows 2 and the upper seat frame 1, a third rotating shaft 2-4 is arranged at the rear hinge, a second rotating shaft 2-3 is arranged at the front hinge between the gallows 2 and the lower seat frame 3, and a fourth rotating shaft 2-5 is arranged at the rear hinge.

[0062] The gallows 2 includes two groups of support rods 2-1 hinged in an X shape, and the support rods 2-1 are fixedly connected to the first rotating shaft 2-2, the second rotating shaft 2-3, the third rotating shaft 2-4, and the fourth rotating shaft 2-5. Rollers are provided at both ends of the first rotating shaft 2-2 and the second rotating shaft 2-3. During the lifting and lowering process of the seat base, the first rotating shaft 2-2 can slide relative to the upper seat frame 1, the second rotating shaft 2-3 can slide relative to the lower seat frame 3, and the third rotating shaft 2-4 and the fourth rotating shaft 2-5 cannot slide. The position of the third rotating shaft 2-4 on the upper seat frame 1 is fixed, and it can rotate relative to the upper seat frame 1. The position of the fourth rotating shaft 2-5 on the lower seat frame 3 is fixed, and it can rotate relative to the lower seat frame 3.

[0063] The seat base also includes the seat height measuring device 4 in Example 1. The mechanism and function of the seat height measuring device 4 have been described in detail in Example 1 and will not be repeated here. The seat height measuring device 4 is arranged on the lower seat frame 3 and is drivingly connected to the fourth rotating shaft 2-5 to detect the rotation angle of the fourth rotating shaft 2-5 during the lifting and lowering process of the upper seat frame 1.

[0064] like Figure 6 As shown, the end of the fourth rotating shaft 2-5 is provided with an axial hole 2-5-1 connected to the first transmission shaft 4-6 in the seat height measuring device 4, and the axial hole 2-5-1 is designed as a polygonal hole adapted to the first transmission shaft 4-6.

[0065] Limiting devices are respectively provided at both ends of the fourth rotating shaft 2-5, and the limiting devices are fixed on the lower seat frame 3, specifically, they can be fixed on the sheet metal part of the seat frame 3. The fourth rotating shaft 2-5 can rotate in the limiting devices. In one embodiment, the limiting device includes a limiting support block.

[0066] like Figure 6 , Figure 7 As shown, the first limit support block 5 and the second limit support block 7 are respectively arranged at both ends of the fourth rotating shaft 2-5. The first limit support block 5 and the second limit support block 7 have the same structure and are symmetrically arranged, and are preferably made of a material with self-lubricating properties. The specific structure thereof is described below by taking the first limit support block 5 as an example.

[0067] The first position-limiting support block 5 includes an upper block 5-1 and a lower block 5-2 which are combined together. The upper block 5-1 and the lower block 5-2 are combined together by bolts 5-3. The detachable structure is convenient for connecting with the fourth rotating shaft 2-5. The bolts 5-3 simultaneously fix the first position-limiting support block 5 on the sheet metal of the seat frame 3. In order to facilitate the assembly of the first position-limiting support block 5, a positioning structure can also be provided between the upper block 5-1 and the lower block 5-2. For example, a positioning column 5-7 is provided on the lower block 5-2, and a positioning hole is correspondingly provided on the upper block 5-1. The combination of the positioning structure and the bolts 5-3 ensures that the upper block 5-1 and the lower block 5-2 can be stably connected.

[0068] A limiting groove 5-4 is arranged in the first limiting support block 5 along the axial direction of the fourth rotation axis 2-5, and the limiting groove 5-4 is equally divided into the upper half block 5-1 and the lower half block 5-2. The axial end of the fourth rotation axis 2-5 is arranged in the limiting groove 5-4, and a protruding tenon 5-5 is arranged in the limiting groove 5-4 along the radial direction of the fourth rotation axis 2-5, and the tenon 5-5 is equally divided into the upper half block 5-1 and the lower half block 5-2. A radially recessed groove 2-5-2 is arranged correspondingly at the axial end of the fourth rotation axis 2-5, and the fourth rotation axis 2-5 can be axially limited by the tenon 5-5 and the groove 2-5-2.

[0069] In one embodiment, the limiting device includes a bearing, because the bearing is rolling friction, and compared with the limiting support block, the bearing has lower wear and higher flexibility. Both ends of the fourth rotating shaft 2-5 can be tightly matched with the bearing, and the axial position is limited by the retaining ring. A bearing seat is set on the lower seat frame 3 corresponding to the bearing, and the bearing seat fixes the bearing on the lower seat frame 3.

[0070] The lifting mode of the upper seat frame 1 is generally divided into two states: a height adjustment state and a working suspension state. In either state, the seat height measuring device 4 can measure the rotation angle of the fourth rotation axis 2-5.

[0071] It should be noted that some seat structures are provided with rollers at both ends of the third rotating shaft 2-4 and the fourth rotating shaft 2-5. During the lifting and lowering process of the seat base, the third rotating shaft 2-4 can slide relative to the upper seat frame 1, and the fourth rotating shaft 2-5 can slide relative to the lower seat frame 3, while the first rotating shaft 2-2 and the second rotating shaft 2-3 cannot slide. The position of the second rotating shaft 2-3 on the lower seat frame 3 is fixed, and it can rotate relative to the lower seat frame 3. The seat height measuring device 4 is arranged on the lower seat frame 3 and is driven and connected to the second rotating shaft 2-3, and the rotation angle of the second rotating shaft 2-3 is detected during the lifting and lowering process of the upper seat frame 1. The present application does not further limit the setting position of the seat height measuring device 4. As long as the seat height measuring device 4 is set at the end of the gallows 2 that is not connected to the roller, it is within the protection scope of the present application.

[0072] The seat base of this embodiment has the following advantages:

[0073] By arranging the seat height measuring device on the lower seat frame and drivingly connecting it with the rotating shaft, the structure of the seat height measuring device in the prior art is simplified, the space occupied is reduced, and interference with other components is avoided.

[0074] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in this application should have the common meanings understood by those skilled in the art to which the present invention belongs.

[0075] In addition, the terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. In the description of the present invention, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0076] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and specification of the present invention. In particular, as long as there is no structural conflict, the various technical features mentioned in each embodiment can be combined in any way. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A seat height measuring device, comprising an outer frame, an inner frame, an angle sensor and a rotation angle magnifying device, wherein the inner frame is arranged in the outer frame, the angle sensor is fixedly connected to the inner frame, the rotation angle magnifying device is arranged in the inner frame, and the rotation angle magnifying device is drivingly connected to the angle sensor, characterized in that: An elastic buffer device is provided between the inner frame and the outer frame, and the elastic buffer device performs movement buffering when the inner frame moves relative to the outer frame. The rotation angle amplification device includes a first transmission shaft, a second transmission shaft, a first gear and a second gear. The first transmission shaft is coaxially fixed with the first gear, the second transmission shaft is coaxially fixed with the second gear, the first gear and the second gear are meshed and transmitted, the radius of the first gear is larger than that of the second gear, the first transmission shaft is drivingly connected to the rotating shaft of the seat base, and the second transmission shaft is drivingly connected to the angle sensor. The outer frame includes a first outer frame and a second outer frame, the first outer frame and the second outer frame are detachably assembled, the second outer frame is fixedly connected to the seat frame of the seat base, the first transmission shaft passes through the second outer frame and is drivingly connected to the rotating shaft of the seat base, the second outer frame is provided with through holes corresponding to the first transmission shaft and the second transmission shaft, and a gap is provided between the inner wall of the through hole and the outer circle of the first transmission shaft and the second transmission shaft, A circuit board is disposed in the first outer frame, the circuit board is fixedly connected to the second outer frame, the circuit board is electrically connected to the angle sensor, a conduction interface is disposed on the circuit board, and a jack is disposed on the first outer frame corresponding to the conduction interface.

2. The seat height measuring device according to claim 1, characterized in that: The elastic buffer device is arranged on the outer side wall of the inner frame and clamped between the outer side wall of the inner frame and the inner side wall of the outer frame.

3. The seat height measuring device according to claim 2, characterized in that: The elastic buffer device comprises a rubber ring, the inner ring of the rubber ring is elastically connected to the outer side wall of the inner frame, and the outer ring of the rubber ring is elastically connected to the inner side wall of the outer frame; Alternatively, the elastic buffer device includes a plurality of springs, one end of each spring is elastically connected to the outer side wall of the inner frame, and the other end of each spring is elastically connected to the inner side wall of the outer frame.

4. The seat height measuring device according to claim 3, characterized in that: A plurality of external protrusions are arranged on the outer ring of the rubber ring, and the external protrusions are elastically connected to the inner side wall of the outer frame.

5. The seat height measuring device according to claim 1, characterized in that: The rear end of the second outer frame is provided with an opening, the inner frame is inserted into the second outer frame through the opening, and the opening is provided with a limiting plate to limit the inner frame.

6. A seat base, comprising an upper seat frame, a gallows and a lower seat frame, wherein the gallows is X-shaped, a first rotating shaft is provided at the front hinge of the gallows and the upper seat frame, a third rotating shaft is provided at the rear hinge, a second rotating shaft is provided at the front hinge of the gallows and the lower seat frame, a fourth rotating shaft is provided at the rear hinge, the second rotating shaft or the fourth rotating shaft is fixed on the lower seat frame and can rotate relative to the lower seat frame, characterized in that: It also includes the seat height measuring device according to any one of claims 1-5, which is arranged on the lower seat frame and is drivingly connected to the second rotating shaft or the fourth rotating shaft, and detects the rotation angle of the second rotating shaft or the fourth rotating shaft during the lifting and lowering process of the upper seat frame.

7. The seat base according to claim 6, characterized in that Limiting devices are respectively arranged at both ends of the second rotating shaft or the fourth rotating shaft, the limiting devices are fixed on the lower seat frame, the second rotating shaft or the fourth rotating shaft is rotatable in the limiting devices, and the limiting devices include limiting support blocks or bearings.

8. The seat base according to claim 7, characterized in that The limit support block comprises an upper half block and a lower half block which are combined together, and the upper half block and the lower half block are combined together by bolts; A limiting groove is arranged in the limiting support block along the axial direction of the second rotating axis or the fourth rotating axis, the axial end of the second rotating axis or the fourth rotating axis is arranged in the limiting groove, a protruding tenon is arranged in the limiting groove along the radial direction of the second rotating axis or the fourth rotating axis, and a radially recessed groove is correspondingly arranged at the axial end of the second rotating axis or the fourth rotating axis.

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