A level

Abstract

This utility model belongs to the field of building decoration and renovation technology, specifically relating to a level, including a base, a connecting ball connected to a limiting component set in the mounting base, a rubber ring placed in an annular groove on the side of the curved surface of the placement groove, the center of the annular groove being coaxial with the center of the placement groove, push plates on both sides of the rubber ring, an observation plate connected to the end of the push plate, a bidirectional screw threaded to the observation plate, a fixing rod fixed to the top surface of the connecting ball connected to the bottom surface of the mounting base, a height adjustment component set in the mounting base, a worm gear meshing with a worm wheel, the worm wheel being sleeved on the outside of the rotating rod, a gear being sleeved on the outside of the rotating rod, the gear meshing with a rack, the rack being fitted at the center of one side of the fixing plate, solving the problem of poor overall stability of the device due to the lack of a limiting component for the movable universal ball and the overall height adjustment device through a wire pulling device, which is easily affected by vibration and other factors during construction, causing the laser line to deviate.

Description

Technical Field

[0001] This utility model belongs to the field of building decoration and renovation technology, and specifically relates to a level. Background Technology

[0002] Architectural decoration is short for architectural decoration and renovation engineering. Architectural decoration is the process of treating the interior and exterior surfaces and spaces of a building with decorative materials or ornaments in order to protect the main structure of the building, improve its physical performance, functionality, and beautification. Architectural decoration is an indispensable part of people's lives, and a level is often needed in the process of decoration and renovation.

[0003] Patent number CN216206276U discloses a level for building decoration and renovation, comprising a placement component, a leveling component, and a suspension component. The placement component includes a base, on the upper surface of which an arc-shaped slide rail is fixedly installed. The leveling component includes an arc-shaped box, inside which a steel ball is slidably placed. A level laser light is fixedly installed at the center of the upper surface of the arc-shaped box. A spherical shell is embedded in the upper end of a connecting block, and a connecting ball is rotatably engaged inside the spherical shell. By setting an L-shaped mounting block, the level can be quickly and easily installed on a vertical surface, reducing the influence of terrain on the level. Through the connecting ball, the level can quickly enter a vertical state, thereby keeping the laser light inside the level horizontal and enabling rapid and accurate working.

[0004] The defects of the above-mentioned patent are as follows:

[0005] 1. Angle adjustment is achieved by rotating the connecting ball and the shell, but there is a lack of effective limiting structure. During construction, the horizontal component is prone to angular deviation due to factors such as vibration, which leads to distortion of the laser line's horizontality. For example, during the installation of doors and windows, if the angle of the level instrument deviates slightly, it may cause the doors and windows to be installed crookedly, requiring repeated calibration and reducing work efficiency.

[0006] Second, the overall height of the wire drawing adjustment device is such that the device is suspended. During construction, factors such as vibration can easily cause the device to shake, thus causing the laser line to deviate. Utility Model Content

[0007] To address the above problems, the purpose of this utility model is to provide a level that solves the problem of poor overall stability of the device due to the lack of a limiting component for the movable universal ball and the overall height adjustment device via wire pulling, which makes the laser line prone to deviation during construction due to factors such as vibration.

[0008] To achieve the above objectives, the present invention adopts the following technical solution: a level, comprising a base, a placement shell fixedly mounted on the top surface of the base, and a connecting seat above a glass frame fixedly mounted on the top surface of the placement shell. A connecting ball is movably fitted into a spherical placement groove at the center of the top surface of the connecting seat. The connecting ball is connected to a limiting component disposed within a mounting base. The limiting component includes a rubber ring, which is placed within an annular groove on the curved side of the placement groove, with the center of the annular groove coaxial with the center of the placement groove. Push plates are provided on both sides of the rubber ring, and an observation plate is connected to the end of the push plate. The observation plate is threadedly connected to a bidirectional screw. A fixing rod fixedly mounted on the top surface of the connecting ball is connected to the bottom surface of the mounting base. A height adjustment component is disposed within the mounting base. The height adjustment component includes a worm gear meshing with a worm wheel, which is sleeved on the outside of a rotating rod. A gear is sleeved on the outside of the rotating rod, and the gear meshes with a rack. The rack is fitted into the center of one side of a fixing plate.

[0009] The beneficial effects of this utility model are:

[0010] By cooperating with the push plate, the rubber ring of the limiting component is pushed to contact the connecting ball, forming a flexible friction limiting system.

[0011] The fixed plate provides rigid support for the height adjustment component. The worm gear transmission system realizes the vertical lifting and lowering of the mounting base through the rack on the fixed plate. This ensures the accuracy of height adjustment and prevents displacement after adjustment by the rigid fixation of the fixed plate, forming a stable installation base and avoiding the shaking problem of wire adjustment.

[0012] To utilize the friction of the rubber ring to limit the movement of the connecting ball:

[0013] As a further improvement to the above technical solution: a limiting block is fixedly provided on the inner wall of the annular groove, and the limiting block is fitted on the outside of the rubber ring to limit its position. When the rubber ring is not pushed by the push plate, it does not contact the surface of the connecting ball.

[0014] The beneficial effects of this improvement are as follows: the rubber ring does not contact the connecting ball when it is not pushed by the push plate, allowing the connecting ball to move freely in the spherical placement groove, which facilitates the angle adjustment of the mounting base. When it is necessary to fix the angle of the mounting base, the rubber ring is pushed to contact the connecting ball by the push plate, and the friction of the rubber ring is used to limit the position of the connecting ball.

[0015] To achieve pushing or releasing the rubber ring:

[0016] As a further improvement to the above technical solution: a transparent plate is provided below the movable groove inside the connecting seat, and the transparent plate is concave. One end of a bidirectional screw is rotatably connected to the inner wall of one side of the bottom end of the transparent plate, and the other end of the bidirectional screw passes through and is rotatably connected to one side of the connecting seat. Slide plates are horizontally slidably provided on both sides of the transparent plate. Two sets of slide plates are respectively sleeved on the outer sides of the two ends of the bidirectional screw and threadedly connected to them. A sliding rod is fixed on the side of the push plate facing the inner wall of the annular groove, and the end of the sliding rod movably passes through the inner wall of one side of the end of the transparent plate. The top side of the observation plate is connected to the end of the sliding rod.

[0017] The beneficial effects of this improvement are as follows: by rotating the bidirectional screw, the two sets of slide plates can slide horizontally along both ends of the bidirectional screw, thereby driving the push plate to move and realize the pushing or releasing of the rubber ring. The observation plate is connected to the slide plate and the slide rod, which can intuitively reflect the movement status of the slide plate, making it convenient for users to accurately control the contact and separation of the rubber ring and the connecting ball, and improving the convenience and accuracy of operation.

[0018] To facilitate monitoring the movement of the observation board:

[0019] As a further improvement to the above technical solution: a movable through groove is provided through the front side of the connecting seat, and an observation plate is horizontally slidably arranged in the movable through groove. The end of the observation plate is connected to one side of the sliding plate, and a transparent plate is provided at the end of the movable through groove corresponding to the front side of the connecting seat.

[0020] The beneficial effects of this improvement are: the transparent plate facilitates the observation of the movement of the observation plate, ensuring accurate operation of the limiting components.

[0021] To achieve precise adjustment of the mounting height:

[0022] As a further improvement to the above technical solution: a groove is provided at the center of the side of the mounting base facing the fixing plate, and a rotating rod is rotatably provided in the groove. The bottom end of the worm gear is rotatably connected to the inner bottom surface of the groove, and the top end of the worm gear is rotatably connected to the top surface of the mounting base. An adjustment block is fixed at one end of the worm gear that passes through the mounting base.

[0023] The beneficial effects of this improvement are as follows: by rotating the adjusting block at the top of the worm, the worm is driven to rotate. The worm meshes with the worm wheel, transmitting the rotation of the worm to the worm wheel, which in turn causes the rotating rod and gear to rotate. The gear meshes with the rack, converting the rotation into the linear motion of the rack, thereby achieving precise adjustment of the mounting height, preventing the mounting from moving on its own due to external forces or other factors, and ensuring stability during the measurement process.

[0024] To facilitate fixing the mounting plate to the wall:

[0025] As a further improvement to the above technical solution: the mounting base is fixedly provided with slide bars at both ends of the side facing the fixed plate, and the slide bars are slidably fitted into the slide grooves opened at both ends of the side facing the mounting base of the fixed plate. The top of the fixed plate is provided with a first mounting hole, and the bottom two sides of the fixed plate are provided with second mounting plates, which are provided with second mounting holes.

[0026] The beneficial effects of this improvement are as follows: the cooperation between the slider and the groove provides a stable guide for the movement of the mounting base, ensuring that the mounting base slides smoothly along a straight line during height adjustment, reducing shaking and offset, and improving the accuracy and stability of height adjustment. The mounting holes one and two on the fixing plate make it easy to fix the fixing plate to the wall.

[0027] In order to use this device:

[0028] As a further improvement to the above technical solution: a counterweight is placed inside the housing, and a horizontal laser light is fixedly installed inside the glass frame. A level is provided at both ends of the connecting seat, and a controller is provided on the front side of the connecting seat. The controller contains a microcontroller, a relay, and a control switch, and is electrically connected to the horizontal laser light.

[0029] The beneficial effects of this improvement are as follows: the counterweight placed inside the housing increases the overall stability of the level, reduces shaking during measurement, and improves measurement accuracy; the level laser light inside the glass frame can project a clear horizontal laser line, providing an intuitive reference benchmark for measurement, making it convenient to quickly determine the level status when measuring large areas or over long distances; the level on the connecting seat can be used as an auxiliary calibration tool, working in conjunction with the level laser light to further improve measurement accuracy.

[0030] To adjust the height of this device on a horizontal surface:

[0031] As a further improvement to the above technical solution: each of the four corners of the base is provided with an adjustable foot, the adjustable foot includes a bolt, the bolt passes through the four corners of the base and is threadedly connected to them, and the bottom end of the bolt is provided with a support cone.

[0032] The beneficial effect of this improvement is that the height of the adjustable feet can be adjusted by rotating the bolts, so that the device can remain horizontal on uneven ground or planes of different heights.

[0033] The parts of the device not covered herein are the same as or can be implemented using existing technologies. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the structure of the present invention. Figure 1 ;

[0035] Figure 2This is a schematic diagram of the structure of the present invention. Figure 2 ;

[0036] Figure 3 This is a rear view schematic diagram of the mounting base of this utility model;

[0037] Figure 4 This is a cross-sectional structural diagram of the mounting base and connecting base of this utility model;

[0038] Figure 5 This is a schematic diagram of the rubber ring structure of this utility model;

[0039] Figure 6 This is a schematic diagram of the cross-sectional structure of the fixing plate of this utility model;

[0040] In the diagram: 1. Base; 2. Adjustable support leg; 201. Bolt; 202. Support cone; 3. Housing; 4. Glass frame; 5. Connecting seat; 501. Transparent plate; 6. Limiting component; 601. Bidirectional screw; 602. Slide bar; 603. Slide plate; 604. Observation plate; 605. Rubber ring; 606. Push plate; 7. Level; 8. Connecting ball; 9. Mounting seat; 10. Height adjustment component; 1001. Gear; 1002. Worm gear; 1003. Slide bar; 1004. Worm; 11. Fixing plate; 1101. Slide groove; 12. Rack; 13. Limiting block. Detailed Implementation

[0041] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be described in detail below with reference to the accompanying drawings. The description in this part is only exemplary and explanatory, and should not be used to limit the scope of protection of this utility model in any way.

[0042] like Figure 1-6As shown, a level includes a base 1, a housing 3 fixedly mounted on the top surface of the base 1, and a connecting seat 5 above a glass frame 4 fixedly mounted on the top surface of the housing 3. A connecting ball 8 is movably fitted into a spherical placement groove at the center of the top surface of the connecting seat 5. The connecting ball 8 is connected to a limiting component 6 disposed in a mounting base 9. The limiting component 6 includes a rubber ring 605, which is placed in an annular groove on the curved side of the placement groove, with the center of the annular groove coaxial with the center of the placement groove. Push plates 606 are provided on both sides of the rubber ring 605. The end of the push plate 606 is connected to the observation plate 604, the observation plate 604 is threadedly connected to the bidirectional screw 601, the fixing rod fixed on the top surface of the connecting ball 8 is connected to the bottom surface of the mounting base 9, the mounting base 9 is provided with a height adjustment component 10, the height adjustment component 10 includes a worm gear 1004, the worm gear 1004 is meshed with a worm wheel 1002, the worm wheel 1002 is sleeved on the outside of the rotating rod, and a gear 1001 is sleeved on the outside of the rotating rod, the gear 1001 is meshed with a rack 12, and the rack 12 is fitted at the center of one side of the fixing plate 11.

[0043] A limiting block 13 is fixed to the inner wall of the annular groove, and the limiting block 13 is fitted on the outside of the rubber ring 605 to limit its position. When the rubber ring 605 is not pushed by the push plate 606, it does not contact the surface of the connecting ball 8. When the rubber ring 605 is not pushed by the push plate 606, it does not contact the connecting ball 8, so that the connecting ball 8 can move freely in the spherical placement groove, which facilitates the angle adjustment of the mounting base 9. When it is necessary to fix the angle of the mounting base 9, the push plate 606 pushes the rubber ring 605 to contact the connecting ball 8, and the friction of the rubber ring 605 is used to limit the position of the connecting ball 8.

[0044] A transparent plate 501 is provided below the movable groove in the connecting seat 5, and the transparent plate 501 is concave. One end of a bidirectional screw 601 is rotatably connected to the inner wall of one side of the bottom end of the transparent plate 501, and the other end of the bidirectional screw 601 is rotatably connected to one side of the connecting seat 5. Slide plates 603 are horizontally slidably provided on both sides of the transparent plate 501. Two sets of slide plates 603 are respectively sleeved on the outer sides of both ends of the bidirectional screw 601 and threadedly connected to them. A sliding rod 602 is fixed on the side of the push plate 606 facing the inner wall of the annular groove, and the sliding rod 602... The end of the transparent plate 501 is movable through the inner wall of one side of the end. The top of the observation plate 604 is connected to the end of the slide rod 602. By rotating the bidirectional screw 601, the two sets of slide plates 603 can slide horizontally along both ends of the bidirectional screw 601, thereby driving the push plate 606 to move and realize the pushing or releasing of the rubber ring 605. The observation plate 604 is connected to the slide plate 603 and the slide rod 602, which can intuitively reflect the movement state of the slide plate 603, making it convenient for users to accurately control the contact and separation of the rubber ring 605 and the connecting ball 8, and improving the convenience and accuracy of operation.

[0045] The front side of the connecting seat 5 is provided with a through slot, and an observation plate 604 is horizontally slidably arranged in the slot. The end of the observation plate 604 is connected to one side of the sliding plate 603. A transparent plate 501 is provided at the end of the slot corresponding to the front side of the connecting seat 5. The transparent plate 501 is provided to facilitate viewing the movement position of the observation plate 604 and to ensure that the operation of the limiting component 6 is accurate.

[0046] The mounting base 9 has a groove at its center on the side facing the fixing plate 11, and a rotating rod is rotatably mounted in the groove. The bottom end of the worm gear 1004 is rotatably connected to the inner bottom surface of the groove, and the top end of the worm gear 1004 is rotatably connected to the top surface of the mounting base 9. An adjusting block is fixed at one end of the worm gear 1004 that passes through the mounting base 9. By rotating the adjusting block at the top of the worm gear 1004, the worm gear 1004 is driven to rotate. The worm gear 1004 meshes with the worm wheel 1002, transmitting the rotation of the worm gear 1004 to the worm wheel 1002, which in turn causes the rotating rod and the gear 1001 to rotate. The gear 1001 meshes with the rack 12, converting the rotation into the linear motion of the rack 12, thereby achieving precise adjustment of the height of the mounting base 9, preventing the mounting base 9 from moving on its own due to external forces or other factors, and ensuring stability during the measurement process.

[0047] Slide bars 1003 are fixedly provided at both ends of the mounting base 9 facing the fixing plate 11, and the slide bars 1003 are slidably fitted into the sliding grooves 1101 opened at both ends of the fixing plate 11 facing the mounting base 9. The top of the fixing plate 11 has a through mounting hole 1, and the bottom two sides of the fixing plate 11 have mounting plates 2, which have through mounting holes 2. The cooperation between the slide bars 1003 and the sliding grooves 1101 provides a stable guide for the movement of the mounting base 9, ensuring that the mounting base 9 slides smoothly along a straight line during height adjustment, reducing shaking and offset, and improving the accuracy and stability of height adjustment. The mounting holes 1 and 2 on the fixing plate 11 facilitate fixing the fixing plate to the wall.

[0048] A counterweight is placed inside the housing 3, and a horizontal laser light is fixedly installed inside the glass frame 4. A level 7 is installed at both ends of the connecting base 5, and a controller is located on the front side of the connecting base 5. The controller contains a microcontroller, a relay, and a control switch, and is electrically connected to the horizontal laser light. The counterweight inside the housing 3 increases the overall stability of the level, reduces shaking during measurement, and improves measurement accuracy. The horizontal laser light inside the glass frame 4 projects a clear horizontal laser line, providing an intuitive reference for measurement and facilitating quick judgment of the horizontal state during large-area or long-distance measurements. The level 7 on the connecting base 5 can be used as an auxiliary calibration tool in conjunction with the horizontal laser light to further improve measurement accuracy.

[0049] Adjustable feet 2 are provided at each of the four corners of the base 1. Each adjustable foot 2 includes a bolt 201, which passes through the four corners of the base 1 and is threaded to them. A support cone 202 is provided at the bottom of the bolt 201. By rotating the bolt 201, the height of the adjustable foot 2 can be adjusted so that the device can maintain a horizontal state on uneven ground or planes of different heights.

[0050] The working principle and usage process of this utility model are as follows: Before using this device, when the level is in its initial state, the connecting ball 8 moves freely in the spherical placement groove opened in the center of the top surface of the connecting seat 5. The rubber ring 605 is located in the annular groove on the side of the curved surface of the placement groove. Since it is not pushed by the push plate 606, the rubber ring 605 remains separated from the surface of the connecting ball 8 and does not impose any limiting constraints on the connecting ball 8. This allows the connecting ball 8 to have flexible freedom of movement. When the decorator begins to measure the wall construction, the first operation is to use a suitable screw to pass through the top of the fixing plate 11. The mounting holes 1 and 2 on the bottom mounting plate 2 are used to fix the fixing plate 11 in the predetermined position on the wall to be constructed. During the installation and fixing of the fixing plate 11, the counterweight block inside the housing 3 plays a key role. Because it increases the weight of the lower part of the level, the entire level device can quickly and automatically adjust to a state perpendicular to the ground under the action of gravity. During this process, the connecting ball 8, with its free movement characteristics in the spherical placement groove, can adapt to the overall posture adjustment of the device in real time, and cooperate with the counterweight block to effectively reduce the initial tilt caused by the device tilting. To ensure the level has a high degree of verticality from the initial installation stage, the worker rotates the double-ended screw 601, causing the two sets of sliding plates 603 to slide horizontally along both ends of the screw 601. This, in turn, moves the push plate 606, which pushes the rubber ring 605 placed in the annular groove on the side of the curved surface of the mounting slot. The friction between the rubber ring 605 and the connecting ball 8 is used to fix the angle of the mounting base 9. If the measuring height of the level needs to be adjusted during use, the worker rotates the adjusting block on the mounting base 9. This adjusting block, along with the height adjustment component... The worm 1004 in 10 is connected to the bottom of the mounting base 9 facing the center groove of the fixing plate 11. The top of the worm 1004 passes through the top surface of the mounting base 9 and is fixed to the adjusting block. When the worker rotates the adjusting block, the worm 1004 rotates. The worm 1004 meshes with the worm wheel 1002 and transmits the rotation to the rotating rod, which in turn drives the gear 1001 on the outer side to rotate. The gear 1001 then meshes with the rack 12 and converts the rotation into the linear motion of the rack 12, so as to achieve precise adjustment of the height of the mounting base 9 to adapt to different construction height requirements.

[0051] It should be noted that, in this document, the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0052] This article uses specific examples to illustrate the principles and implementation methods of this utility model. The above examples are only for the purpose of helping to understand the method and core ideas of this utility model. The above description is only a preferred embodiment of this utility model. It should be noted that due to the limitations of textual expression, there are objectively infinite specific structures. For those skilled in the art, several improvements, modifications, or changes can be made without departing from the principles of this utility model, and the above technical features can also be combined in an appropriate manner. These improvements, modifications, changes, or combinations, or the direct application of the concept and technical solution of this utility model to other occasions without modification, should all be considered within the protection scope of this utility model.

Claims

1. A level, characterized in that: Includes a base (1), on the top surface of which a placement shell (3) is fixedly mounted, and a glass frame (4) fixedly mounted on the top surface of the placement shell (3) is provided with a connecting seat (5) above it. A connecting ball (8) is movably fitted into a spherical placement groove opened at the center of the top surface of the connecting seat (5). The connecting ball (8) is connected to a limiting component (6) provided in the mounting base (9). The limiting component (6) includes a rubber ring (605). The rubber ring (605) is placed in an annular groove opened on the curved side of the placement groove, and the center of the annular groove is coaxial with the center of the placement groove. Push plates (606) are provided on both sides of the rubber ring (605). 6) The end is connected to the observation plate (604), the observation plate (604) is threaded to the bidirectional screw (601), the fixed rod fixed on the top surface of the connecting ball (8) is connected to the bottom surface of the mounting base (9), the mounting base (9) is provided with a height adjustment component (10), the height adjustment component (10) includes a worm (1004), the worm (1004) is meshed with the worm wheel (1002), the worm wheel (1002) is sleeved on the outside of the rotating rod, and a gear (1001) is sleeved on the outside of the rotating rod, the gear (1001) is meshed with the rack (12), and the rack (12) is fitted at the center of one side of the fixed plate (11).

2. A level according to claim 1, characterised in that: A limiting block (13) is fixedly provided on the inner wall of the annular groove, and the limiting block (13) is fitted on the outside of the rubber ring (605) to limit its position. When the rubber ring (605) is not pushed by the push plate (606), it does not contact the surface of the connecting ball (8).

3. A level according to claim 1, wherein: A transparent plate (501) is provided below the movable groove in the connecting seat (5), and the transparent plate (501) is concave. One end of a bidirectional screw (601) is rotatably connected to the inner wall of the bottom side of the transparent plate (501), and the other end of the bidirectional screw (601) is rotatably connected to one side of the connecting seat (5). Slide plates (603) are slidably provided on both sides of the transparent plate (501). Two sets of slide plates (603) are respectively sleeved on the outer sides of the two ends of the bidirectional screw (601) and threadedly connected to them. A slide rod (602) is fixed on the side of the push plate (606) facing the inner wall of the annular groove, and the end of the slide rod (602) movably penetrates the inner wall of the end of the transparent plate (501). The top side of the observation plate (604) is connected to the end of the slide rod (602).

4. The level of claim 1, wherein: The front side of the connecting seat (5) is provided with a movable through groove, and an observation plate (604) is horizontally slidably arranged in the movable through groove. The end of the observation plate (604) is connected to one side of the sliding plate (603), and a transparent plate (501) is provided at the end of the movable through groove corresponding to the front side of the connecting seat (5).

5. The level of claim 1 wherein: The mounting base (9) has a groove at the center of the side facing the fixing plate (11), and a rotating rod is rotatably installed in the groove. The bottom end of the worm (1004) is rotatably connected to the inner bottom surface of the groove, and the top end of the worm (1004) is rotatably connected to the top surface of the mounting base (9). An adjustment block is fixed at one end of the worm (1004) that passes through the mounting base (9).

6. The level of claim 1, wherein: The mounting base (9) is fixed with slide bars (1003) at both ends of the side facing the fixing plate (11), and the slide bars (1003) are slidably fitted into the slide grooves (1101) opened at both ends of the side facing the mounting base (9) of the fixing plate (11). The top of the fixing plate (11) is provided with a first mounting hole, and the bottom of the fixing plate (11) is provided with a second mounting plate on both sides, and the second mounting plate is provided with a second mounting hole.

7. The level of claim 1 wherein: The placement shell (3) contains a counterweight, and the glass frame (4) contains a fixed horizontal laser lamp. The connecting seat (5) has a level (7) at both ends, and the front of the connecting seat (5) has a controller, which contains a microcontroller, a relay, and a control switch. The controller is electrically connected to the horizontal laser lamp.

8. The level of claim 1 wherein: Adjustable feet (2) are provided at the four corners of the base (1). The adjustable feet (2) include bolts (201). The bolts (201) pass through the four corners of the base (1) and are threaded to them. The bottom end of the bolts (201) is provided with a support cone (202).

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