A torsional torque measuring device suitable for the foot

Abstract

This invention provides a torsional torque measuring device suitable for the foot, comprising: a base, with a first fixed plate at one end along its length; an angle adjustment device located at the end of the first fixed plate facing the base and above the base; a rotating shaft, one end of which is rotatably connected to a rotatable tray, and the other end of which is equipped with a torque sensor; a support plate located at the end of the torque sensor facing away from the first fixed plate, and the support plate is equipped with a strap; a lifting platform located at the top of the base and at the other end along its length; an instrument display located at the top of the first fixed plate; and a control module for receiving the angle change value and torsional torque output by the torque sensor in real time, processing them to obtain a time-angle-torsional torque change curve, and transmitting it to the instrument display for visualization. The beneficial effect is that this invention provides a torsional torque measuring device with a simple structure, convenient operation, multifunctionality, and high measurement accuracy.

Description

Technical Field

[0001] This invention relates to the technical field of torsional torque measuring instruments, and more specifically, to a torsional torque measuring device suitable for the foot. Background Technology

[0002] In the fields of sports medicine and biomechanics, the measurement of torsional torque of the foot is a key technology that can help researchers and medical personnel gain a deeper understanding of the biomechanical characteristics of the foot during human movement. Currently, the commonly used measurement methods mainly rely on optical motion capture systems and strain gauge-based torsional stiffness measurement devices. Although these technologies can provide measurement data of torsional torque of the foot to a certain extent, their widespread application in clinical practice and research is often limited by the high cost of equipment, the complexity of operation, and the high technical requirements for operators. In addition, these methods may be affected by environmental factors in practical applications, affecting the accuracy and reliability of the measurement results.

[0003] The limitations of existing measurement technologies mainly lie in their operational complexity, insufficient measurement accuracy, and difficulty in measuring foot torsional torque in real-world motion scenarios. For example, optical motion capture systems require multiple markers to be placed on the subject and multiple high-speed cameras to capture the movement of these points to calculate the dynamic data of foot movement. This not only increases the complexity of the process but also incurs high costs. While ordinary pressure sensors and strain gauges can provide some measurement data, their measurement range and accuracy often fall short of high-precision requirements, and they cannot simulate changes in foot movement in real-world motion scenarios, especially under dynamic conditions. Furthermore, existing technologies also have limitations in data processing and analysis, requiring complex data processing by professionals, which undoubtedly increases the difficulty of research and clinical applications.

[0004] Given the limitations of existing technologies, the market and academia urgently need a new type of foot torsional torque measuring device. It should be simple in structure, easy to operate, multifunctional, and highly accurate. This instrument should be able to adapt to different measurement environments and conditions and provide stable and reliable data. At the same time, it should be easy to carry and operate, so that researchers and medical professionals can quickly perform measurements in various situations. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a torsional torque measuring device that is simple in structure, easy to operate, multifunctional and highly accurate. In order to overcome the defects of the prior art (or related art) mentioned above, the present invention provides a torsional torque measuring device suitable for the foot.

[0006] This invention provides a torsional torque measuring device suitable for the foot, comprising:

[0007] A base, wherein a first fixing plate is provided at one end along its own length direction, and the horizontal height of the top of the first fixing plate is greater than the horizontal height of the top of the base;

[0008] An angle adjustment device is provided at the end of the first fixed plate facing the base and located above the base, and the end of the angle adjustment device facing away from the first fixed plate is a rotatable tray;

[0009] A rotating shaft is provided, one end of which is rotatably connected to the rotatable tray, and the other end of which is provided with a torque sensor. The torque sensor is used to detect and output the angle change value and torsional torque of the rotating shaft in real time.

[0010] A support plate is provided at one end of the torque sensor that is opposite to the first fixing plate, and a strap is provided on the support plate to fix the front end of the user's foot.

[0011] A lifting platform is located at the top of the base and at the other end of the base along its own length to support the rear of the user's feet.

[0012] An instrument display is located at the top of the first fixed plate, with the display end of the instrument display facing the lifting platform;

[0013] A control module is connected to the torque sensor and the instrument display, respectively, for receiving the angle change value and the torsional torque output by the torque sensor in real time, and processing the angle change value and the torsional torque to obtain the time-angle-torsional torque change curve, which is then transmitted to the instrument display for visualization.

[0014] Compared with the prior art, the torsional torque measuring device for the foot of the present invention has the following advantages:

[0015] (1) High measurement accuracy: In this application, a precision torque sensor is set between the rotating shaft and the support plate. The high-precision foot torsional torque measurement data is obtained in real time as the rotating shaft rotates with the user's foot, ensuring the reliability of the measurement results;

[0016] (2) Multifunctionality: In this application, by combining the angle adjustment device and the lifting platform, the foot torque measurement under different foot postures can be realized, which can better simulate the real sports scene. The adjustment range can cover all foot postures that may occur during running.

[0017] (3) Easy to operate: In this application, the user only needs to fix the foot on the support plate to start the measurement, and the measurement data will be displayed on the instrument display in real time, so that the user can adaptively adjust the foot posture according to the measurement data;

[0018] (4) Simple structure: This application does not require the use of large measuring instruments or complex structures. Foot fixation is achieved through support plates and straps, foot support is achieved through a lifting platform, data measurement is achieved through a rotating shaft and torque sensor, and data visualization is achieved through an instrument display, which is very convenient.

[0019] In one possible implementation, the angle adjustment device includes a second fixed plate, two semi-circular plates, a U-shaped plate, and the rotatable tray. The second fixed plate is located at the end of the first fixed plate facing the base. The two semi-circular plates are symmetrically located at the end of the second fixed plate facing the lifting platform and are perpendicular to the second fixed plate. Each of the two semi-circular plates has a plurality of first fixing holes arranged in a circumferential array along the semi-circular arc edge, and the first fixing holes on the two semi-circular plates are symmetrically arranged. At least one second fixing hole is provided on each of the two sides of the U-shaped plate, so that the two second fixing holes can be fixedly connected to any set of first fixing holes by bolts and nuts. The rotatable tray is fixed to the end of the U-shaped plate facing away from the first fixed plate.

[0020] Compared with existing technologies, the above technical solution facilitates the adjustment of the support plate angle and offers a variety of angle options.

[0021] In one possible implementation, the end of the U-shaped plate facing the first fixed plate is rotatably connected to the second fixed plate via a fixed rod, and four first fixed holes are respectively provided on the two semi-circular plates, with the distance between any two adjacent first fixed holes being the same.

[0022] In one possible implementation, the end of the U-shaped plate facing the first fixed plate is rotatably connected to the second fixed plate via a fixed rod. The two semi-circular plates are respectively provided with four first fixed holes, and the distance between any two adjacent first fixed holes is different, so that when the second fixed hole is fixedly connected to different first fixed holes, the support plate forms an angle of 0°, 30°, 45° or 60° with the horizontal plane.

[0023] Compared with existing technologies, the above technical solution can provide users with two different angle adjustment options to meet the testing needs of different scenarios.

[0024] In one possible implementation, the lifting platform includes:

[0025] Two intersecting support rods are provided, each of which includes four first connecting rods. The two sets of intersecting first connecting rods are rotatably connected, and the two sets of first connecting rods with end connections are hinged. One end of the two lower first connecting rods is fixedly connected to the top of the base, and the other end is a hinge point. A second connecting rod is provided between the corresponding hinge points of the two intersecting support rods, and both ends of the second connecting rod are hinged to the hinge point. A through hole is provided in the middle of each second connecting rod along the length direction of the base.

[0026] A support platform, the bottom end of which is fixedly connected to the top ends of the four first connecting rods located above it;

[0027] A rotating screw passes through the two holes on the second connecting rod in sequence and is threaded into the holes;

[0028] A knob is located at either end of the rotating screw and is fixedly connected to the rotating screw, so that the user can rotate the rotating screw by the knob to adjust the distance between the two second connecting rods, thereby causing the two cross-shaped support rods to retract or expand.

[0029] Compared with existing technologies, the above technical solution enables convenient adjustment of the retraction or expansion of the cross support rod through the cooperation between the first link, the second link, and the rotating screw, and can maintain any height adjustment.

[0030] In one possible implementation, the lifting platform further includes two third fixing plates disposed at the top of the base. Each of the two third fixing plates has a first sliding groove along the length of the base. One end of the first connecting rod of one of the two cross-shaped support rods located at the bottom is fixedly connected to the third fixing plate located on the same side, and one end of the other first connecting rod is slidably connected to the first sliding groove on the third fixing plate located on the same side.

[0031] In one possible implementation, the lifting platform further includes two fourth fixing plates located at the bottom of the support platform. Each of the two fourth fixing plates has a second sliding groove along the length of the base. One end of the first connecting rod of one of the two cross-shaped support rods located at the top is fixedly connected to the fourth fixing plate located on the same side, and one end of the other first connecting rod is slidably connected to the second sliding groove on the fourth fixing plate located on the same side.

[0032] In one possible implementation, a groove is formed at the top of the base, and both the angle adjustment device and the lifting platform are located within the groove. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0034] Figure 2 This is a schematic diagram showing the position of the second fixing hole in the present invention;

[0035] Figure 3 This is a schematic diagram of the torque sensor of the present invention;

[0036] 1. Explanation of reference numerals in the attached drawings: 1. Base; 2. First fixing plate; 3. Angle adjustment device; 31. Rotatable tray; 32. Second fixing plate; 33. Semicircular plate; 34. U-shaped plate; 35. First fixing hole; 36. Second fixing hole; 4. Rotating shaft; 5. Torque sensor; 6. Support plate; 7. Strap; 8. Lifting platform; 81. First connecting rod; 82. Second connecting rod; 83. Support platform; 84. Rotating screw; 85. Knob; 86. Third fixing plate; 87. First slide groove; 88. Fourth fixing plate; 89. Second slide groove; 9. Instrument display; 10. Groove. Detailed Implementation

[0037] First, those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the present invention and are not intended to limit the scope of protection of the present invention. Those skilled in the art can make adjustments as needed to adapt to specific application scenarios.

[0038] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0039] See Figure 1This invention discloses a torsional torque measuring device suitable for the foot, comprising a base 1, a first fixing plate 2, an angle adjustment device 3, a rotating shaft 4, a torque sensor 5, a support plate 6, a strap 7, a lifting platform 8, an instrument display 9, and a control module. The base 1 has the first fixing plate 2 at one end along its length, and the horizontal height of the top of the first fixing plate 2 is greater than the horizontal height of the top of the base 1. The angle adjustment device 3 is located at the end of the first fixing plate 2 facing the base 1 and above the base 1, while the end of the angle adjustment device 3 facing away from the first fixing plate 2 is a rotatable tray 31. One end of the rotating shaft 4 is rotatably connected to the rotatable tray 31, and the other end of the rotating shaft 4 is equipped with a torque sensor 5, which is used for... The system detects and outputs the angle change value and torsional torque of the rotating shaft 4 in real time; the support plate 6 is located at the end of the torque sensor 5 facing away from the first fixed plate 2, and the support plate 6 is provided with straps 7 to fix the front end of the user's feet; the lifting platform 8 is located at the top of the base 1 and at the other end of the base 1 along its own length direction to support the rear end of the user's feet; the instrument display 9 is located at the top of the first fixed plate 2 and the display end of the instrument display 9 faces the lifting platform 8; the control module is connected to the torque sensor 5 and the instrument display 9 respectively, and is used to receive the angle change value and torsional torque output by the torque sensor 5 in real time, and process the angle change value and torsional torque to obtain the time-angle-torsional torque change curve, which is then transmitted to the instrument display 9 for visualization display.

[0040] Continue to participate Figure 1 The base 1 is made of metal and is used to provide a stable support structure. The base 1 is placed on a flat ground to ensure that the entire device remains stable during the test.

[0041] Continue to participate Figure 1 and Figure 2 The angle adjustment device 3 includes a second fixed plate 32, two semi-circular plates 33, a U-shaped plate 34, and a rotatable tray 31. The second fixed plate 32 is located at the end of the first fixed plate 2 facing the base 1. The two semi-circular plates 33 are symmetrically located at the end of the second fixed plate 32 facing the lifting platform 8 and are perpendicular to the second fixed plate 32. Each of the two semi-circular plates 33 has a plurality of first fixing holes 35 arranged in a circumferential array along the semi-circular arc edge, and the first fixing holes 35 on the two semi-circular plates 33 are symmetrically arranged. At least one second fixing hole 36 is provided on each of the two sides of the U-shaped plate 34, so that the two second fixing holes 36 can be fixedly connected to any set of first fixing holes 35 by bolts and nuts. The rotatable tray 31 is fixed to the end of the U-shaped plate 34 facing away from the first fixed plate 2.

[0042] Continue to participate Figure 1The end of the U-shaped plate 34 facing the first fixed plate 2 is rotatably connected to the second fixed plate 32 via a fixed rod. The two semi-circular plates 33 are respectively provided with four first fixed holes 35 and the distance between each pair of adjacent first fixed holes 35 is the same.

[0043] Continue to participate Figure 1 The angle adjustment device 3 is made of metal and features a multi-hole design. The surface has four pre-set first fixing holes 35 at different angles, corresponding to 0°, 30°, 45° and 60° respectively. Angle adjustment is achieved by fixing with nuts and bolts. Users can select the appropriate hole position according to the test requirements. After adjusting the angle, users can tighten the screws to ensure that the adjustable tray 31 remains stable throughout the test, avoiding the impact of shaking on the measurement results. This design can provide stable support at different angles and effectively ensure the accuracy of the measurement.

[0044] Continue to participate Figure 1 The lifting platform 8 includes:

[0045] Two cross-type support rods, each cross-type support rod including four first connecting rods 81, wherein the two sets of first connecting rods 81 that cross each other are rotatably connected, and the two sets of first connecting rods 81 that have an end connection relationship are hinged. One end of the two lower first connecting rods 81 is fixedly connected to the top of the base 1, and the other end is a hinge point. A second connecting rod 82 is provided between the corresponding hinge points of the two cross-type support rods, and both ends of the second connecting rod 82 are hinged to the hinge point. A through hole is opened in the middle of each second connecting rod 82 along the length direction of the base 1.

[0046] A support platform 83, the bottom end of which is fixedly connected to the top ends of four first connecting rods 81 located above.

[0047] A rotating screw 84 passes through the holes on two second connecting rods 81 in sequence and is threaded into the holes;

[0048] A knob 85 is located at any end of the rotating screw 84 and is fixedly connected to the rotating screw 84, so that the user can adjust the distance between the two second connecting rods 81 by rotating the rotating screw 84 through the knob 85, thereby causing the two cross support rods to retract or open.

[0049] Continue to participate Figure 1The lifting platform 8 uses a scissor structure design to achieve smooth vertical lifting and adjustment. The bottom of the support platform 83 is connected to a cross-type support rod, which is fixed to the platform frame by hinges. The lifting height can be controlled by rotating the screw 84. The screw 84 is equipped with a knob 85. Users can manually rotate the knob 85 to precisely adjust the height of the platform, ensuring the stability and smoothness of the lifting. After adjustment, tightening the screw 84 can lock the platform height to prevent height changes during measurement. The upper surface of the platform is made of metal plate, providing sufficient strength to support the feet and ensuring the levelness and stability of the platform during testing.

[0050] Continue to participate Figure 1 The torque sensor 5 is tightly connected to the bearing system via the rotating shaft 4. The rotating shaft 4 rotates freely with the support of the bearing system to accurately measure the torsional torque applied by the foot. The bearing system adopts a double bearing design, with inner and outer bearings supporting the two ends of the rotating shaft 4 respectively, ensuring that the rotating shaft 4 can rotate smoothly under force, reducing axial and radial friction, and improving the overall measurement stability and accuracy. The upper part of the rotating shaft 4 is connected to the support plate 6, which is tightly fitted to the foot of the test subject through a fixing device to ensure that every torsional movement of the foot can be directly transmitted to the rotating shaft 4.

[0051] Continue to participate Figure 1 When the test subject applies a torsional force, the rotating shaft 4 rotates with the support of the bearing system. At this time, the torque sensor 5 detects the angle change and torsional torque of the rotating shaft 4 and converts these physical quantities into electrical signals. The torque sensor 5 transmits the angle change and torque data to the control module through its high-precision measurement circuit. The control module can process, analyze and store the collected signals in real time. At the same time, the data is also transmitted to the instrument display 9 through the digital interface, allowing the user to view the value of the foot torsional torque in real time, ensuring data visualization and accurate recording throughout the test process.

[0052] Continue to participate Figure 1 The control module, including an embedded system or computer, possesses efficient data acquisition and processing capabilities. This module is connected to the torque sensor 5 and receives the electrical signals output by the torque sensor 5 in real time. The control module can record key data such as the torsional torque value of the foot, the time of torque generation, angular changes, and torque fluctuation curves. The schematic diagram of the torque sensor 5 is shown below. Figure 3 As shown, the direction of torque is indicated.

[0053] Continue to participate Figure 1The instrument display 9 is a digital display screen that displays the torsional torque value and other measurement data in real time, making it convenient for operators and test subjects to monitor in real time. The display screen of the instrument display 9 updates the values ​​at a high frequency, which can quickly respond to the instantaneous changes in the foot and provide immediate feedback.

[0054] Continue to participate Figure 1 The strap 7 is made of a soft yet strong material to secure the foot tightly without causing discomfort. The support 6 provides a stable support surface to ensure the foot remains stable during testing. The tie 7 is secured with Velcro or buckles for easy and quick adjustment and removal.

[0055] Continue to participate Figure 1 The device described in this application is used in accordance with the following method:

[0056] Step S1, Preparation:

[0057] Install the device on a flat surface, ensuring the base 1 is stable. Adjust the position of the adjustable angle tray 31 and the lifting platform 3 according to the foot posture of the test subject, and lock them.

[0058] Step S2, fix the foot:

[0059] The test subject places his / her foot on the support plate 6 and fixes his / her foot with the strap 7, ensuring that the strap 7 fits snugly against the foot but does not cause discomfort, and that the foot remains stable on the support plate 6;

[0060] Step S3, measure the torsional torque:

[0061] Under guidance, the test subject applies a torsional torque on their foot. The torque sensor 5 measures the applied torsional torque in real time. The torque sensor 5 converts the measured torsional torque value into an electrical signal and transmits it to the control module via a data line.

[0062] Step S4, Data Recording and Analysis:

[0063] The control module records the received electrical signals in real time and converts them into torsional torque values. The control module analyzes the measurement data through built-in software and generates torsional torque values ​​that are displayed on the instrument display 9, providing data support for foot health assessment, rehabilitation training and sports performance analysis.

[0064] In the description of this invention, the references to "one embodiment," "some embodiments," "in this embodiment," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0065] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A torsional torque measuring device suitable for the foot, characterized in that, include: A base (1) is provided with a first fixing plate (2) at one end along its own length direction, and the horizontal height of the top of the first fixing plate (2) is greater than the horizontal height of the top of the base (1); An angle adjustment device (3) is provided at one end of the first fixed plate (2) facing the base (1) and located above the base (1). The end of the angle adjustment device (3) facing away from the first fixed plate (2) is a rotatable tray (31). A rotating shaft (4) is provided at one end of which is rotatably connected to the rotatable tray (31). A torque sensor (5) is provided at the other end of the rotating shaft (4). The torque sensor (5) is used to detect and output the angle change value and torsional torque of the rotating shaft (4) in real time. A support plate (6) is provided at one end of the torque sensor (5) facing away from the first fixing plate (2), and a strap (7) is provided on the support plate (6) to fix the front end of the user's foot. A lifting platform (8) is located at the top of the base (1) and at the other end of the base (1) along its own length direction to support the rear end of the user's feet; An instrument display (9) is located at the top of the first fixed plate (2) and the display end of the instrument display (9) faces the lifting platform (8). A control module is connected to the torque sensor (5) and the instrument display (9) respectively. It is used to receive the angle change value and the torsional torque output by the torque sensor (5) in real time, and process the angle change value and the torsional torque to obtain the time-angle-torsional torque change curve, which is then transmitted to the instrument display (9) for visualization. The angle adjustment device (3) includes a second fixing plate (32), two semi-circular plates (33), a U-shaped plate (34), and the rotatable tray (31). The second fixing plate (32) is located at one end of the first fixing plate (2) facing the base (1). The two semi-circular plates (33) are symmetrically located at one end of the second fixing plate (32) facing the lifting platform (8) and perpendicular to the second fixing plate (32). Each of the two semi-circular plates (33) has multiple first fixing holes (35) arranged in a circumferential array along the semi-circular arc edge, and the first fixing holes (35) on the two semi-circular plates (33) are symmetrically arranged. At least one second fixing hole (36) is provided on each of the two sides of the U-shaped plate (34) so ​​that the two second fixing holes (36) can be fixedly connected to any set of first fixing holes (35) by bolts and nuts. The rotatable tray (31) is fixed to one end of the U-shaped plate (34) facing away from the first fixing plate (2). The lifting platform (8) includes: Two cross-type support rods, each of which includes four first connecting rods (81), wherein the two sets of first connecting rods (81) that cross each other are rotatably connected, and the two sets of first connecting rods (81) that have an end connection relationship are hinged. One end of the two first connecting rods (81) located below is fixedly connected to the top of the base (1), and the other end is a hinge point. A second connecting rod (82) is provided between the corresponding hinge points of the two cross-type support rods, and both ends of the second connecting rod (82) are hinged to the hinge point. A through hole is opened in the middle of each second connecting rod (82) along the length direction of the base (1). A support platform (83) is fixedly connected at its bottom end to the top end of the four first connecting rods (81) located above it. A rotating screw (84) passes through the holes on the two second connecting rods (82) in sequence and is threadedly connected to the holes; A knob (85) is located at any end of the rotating screw (84) and is fixedly connected to the rotating screw (84) so ​​that the user can rotate the rotating screw (84) by the knob (85) to adjust the distance between the two second connecting rods (82) and drive the two cross support rods to retract or open.

2. The torsional torque measuring device according to claim 1, characterized in that, The end of the U-shaped plate (34) facing the first fixed plate (2) is rotatably connected to the second fixed plate (32) through a fixed rod. The two semi-circular plates (33) are respectively provided with four first fixed holes (35) and the distance between each pair of adjacent first fixed holes (35) is the same.

3. The torsional torque measuring device according to claim 1, characterized in that, The U-shaped plate (34) is rotatably connected to the second fixed plate (32) at one end facing the first fixed plate (2) via a fixed rod. The two semi-circular plates (33) are respectively provided with four first fixed holes (35) and the distance between each pair of adjacent first fixed holes (35) is different, so that when the second fixed hole (36) is fixedly connected to different first fixed holes (35), the support plate (6) forms an angle of 0°, 30°, 45° or 60° with the horizontal plane.

4. The torsional torque measuring device according to claim 1, characterized in that, The lifting platform (8) also includes two third fixing plates (86) located at the top of the base (1). Each of the two third fixing plates (86) has a first sliding groove (87) along the length of the base (1). One end of the first connecting rod (81) of one of the two cross support rods located at the bottom is fixedly connected to the third fixing plate (86) located on the same side, and one end of the other first connecting rod (81) is slidably connected to the first sliding groove (87) on the third fixing plate (86) located on the same side.

5. The torsional torque measuring device according to claim 1 or 4, characterized in that, The lifting platform (8) also includes two fourth fixing plates (88) located at the bottom of the support platform (83). A second sliding groove (89) is opened on each of the two fourth fixing plates (88) along the length direction of the base (1). One end of the first connecting rod (81) of one of the two cross-type support rods located above is fixedly connected to the fourth fixing plate (88) located on the same side, and one end of the other first connecting rod (81) is slidably connected to the second sliding groove (89) on the fourth fixing plate (88) located on the same side.

6. The torsional torque measuring device according to claim 1, characterized in that, The top of the base (1) has a groove (10), and the angle adjustment device (3) and the lifting platform (8) are both located in the groove (10).

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