Upturning type telescopic stair capable of being stably supported

Abstract

The utility model discloses an upturning type telescopic stair capable of being stably supported, which comprises a mounting plate, mounting racks are symmetrically hinged to one side of the mounting plate, a telescopic stair assembly is movably connected to one side of each of the two mounting racks, and torsional springs are arranged at the joints of the mounting racks and the telescopic stair assembly. The telescopic stair assembly comprises two mounting frames, supporting frames are movably connected to one sides of the two mounting frames, connecting assemblies are arranged at the connecting positions of the telescopic stair assembly and the two supporting frames, the connecting assemblies comprise hollow rods movably connected to the two sides of the telescopic stair assembly, and fixing blocks are fixedly mounted on one sides of the interiors of the hollow rods; a movable rod is slidably connected into the fixed block; according to the telescopic stair assembly, the mounting sleeve reciprocates on the supporting frame in the telescopic process of the telescopic stair assembly, displacement of the mounting sleeve in the moving process can be avoided, the influence on the stability of the telescopic stair assembly is avoided, lubrication is facilitated, and the situation that the mounting sleeve is inconvenient to move is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of telescopic stairs, in particular to an upward-turning telescopic staircase capable of stable support. Background Art

[0002] Stairs are used for transportation between two places with a height difference, and are widely used both indoors and outdoors. With the development of the stair field, various types of stairs have emerged, and ordinary loft stairs use telescopic stairs to save space.

[0003] Publication No. CN219118598U discloses a novel upward-flipping telescopic staircase. The patent can drive the adjusting screw to rotate by adjusting the rotation of the motor, and the sliding support can be driven to slide along the sliding groove by adjusting the rotation of the screw. The stretching length of the power-assisting tension spring can be adjusted by sliding the sliding support up and down, so as to adjust the tension of the power-assisting tension spring. The power-assisting tension spring makes it easier to fold the folding staircase assembly, and the tension of the power-assisting tension spring directly acts on the folding staircase assembly to make the folding labor-saving effect better. The rotating power-assisting frame can be lifted by connecting the torsion spring, so as to further increase the folding effect of the folding staircase assembly. The sliding connection block is connected to the sliding groove to prevent the connecting short column from being worn during repeated use, so as to extend the service life of the stairs. The novel upward-flipping telescopic staircase has a simple structure, which not only makes it easier to fold the stairs, but also can adjust the tension when the stairs are folded, and increases the service life of the stairs. However, the patent still has the following problems in actual use:

[0004] The sliding support can be driven to slide along the sliding groove by rotating the adjusting screw, and the stretching length of the power-assisting tension spring can be adjusted by sliding the sliding support up and down, thereby adjusting the tension of the power-assisting tension spring. However, in actual use, the retraction and extension of the telescopic stairs will drive the sliding connection block to slide back and forth on the sliding groove. There is no limit on both sides of the sliding connection block during the reciprocating movement of the sliding connection block. The sliding connection block is prone to swing while sliding along the sliding groove, which will affect the stability of the retraction and extension of the telescopic stairs. The sliding connection block is prone to wear due to the need to move. In order to ensure ease of use, the sliding connection block needs to be lubricated. If a limiting structure is directly added on both sides of the sliding connection block to prevent the sliding connection block from moving, it is inconvenient to lubricate the sliding connection block due to the existence of the limiting structure.

[0005] The invention provides a stably supported upwardly-turned telescopic staircase to solve the above-mentioned problems. Utility Model Content

[0006] The utility model aims to provide a stably supported upward-flipping telescopic staircase to solve the problem proposed in the above-mentioned background technology that the sliding support can be driven to slide along the sliding groove by rotating the adjusting screw, and the stretching length of the assisting tension spring can be adjusted by sliding the sliding support up and down, thereby adjusting the tension of the assisting tension spring. However, in actual use, the retraction and extension of the telescopic staircase will drive the sliding connection block to slide back and forth on the sliding groove, and there is no limit on both sides of the sliding connection block during the reciprocating movement of the sliding connection block. The sliding connection block is prone to swing while sliding along the sliding groove, which will affect the stability of the retraction and extension of the telescopic staircase. The sliding connection block is prone to wear due to the need to move. In order to ensure ease of use, the sliding connection block needs to be lubricated. If limiting structures are directly added on both sides of the sliding connection block to prevent the sliding connection block from moving, it is inconvenient to lubricate the sliding connection block due to the existence of the limiting structure.

[0007] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a stably supported upward-turning telescopic staircase, comprising a mounting plate;

[0008] One side of the mounting plate is symmetrically hinged with a mounting frame, and one side of the two mounting frames is movably connected with a telescopic staircase assembly, and a torsion spring is provided at the connection between the mounting frame and the telescopic staircase assembly, and one side of the two mounting frames is movably connected with a support frame;

[0009] Also includes:

[0010] The connection between the telescopic staircase assembly and the two support frames is provided with a connection assembly;

[0011] Wherein, the connection assembly comprises a hollow rod movably connected to both sides of the telescopic staircase assembly, and a fixed block is fixedly installed on one side of the inner part of the hollow rod, and a movable rod is slidably connected inside the fixed block, and the movable rod is slidably connected to the hollow rod;

[0012] Among them, a telescopic spring is sleeved on the outer side of the movable rod, and one end of the telescopic spring is fixedly connected to the fixed block, and the other end of the telescopic spring is fixedly installed with a connecting block, and the connecting block is fixedly connected to the movable rod, and a first limit block is slidably connected to the outer side of the hollow rod, and two groups of sliding grooves are symmetrically opened on the inner side of the first limit block outside the hollow rod, and two groups of sliding rods are symmetrically installed on the outer side of the movable rod, and the sliding rods are slidably connected to the sliding grooves, and the sliding rods are fixedly connected to the first limit block.

[0013] Preferably, a mounting sleeve is sleeved on one side of the first limit block outside the hollow rod, and a second limit block is fixedly mounted on one side of the mounting sleeve, and the first limit block, the mounting sleeve and the second limit block are all slidably connected to the support frame.

[0014] Preferably, the outside of the hollow rod is located on one side of the interior of the mounting sleeve and two groups of mounting grooves are symmetrically opened and penetrated, and the interior of the mounting groove is rotatably connected to a rotating gear, and two groups of first tooth plates are symmetrically installed on the outside of the connecting block, and the first tooth plate is meshingly connected to the rotating gear, and one side of the rotating gear is meshingly connected to the second tooth plate, and a magnet block is fixedly installed on one side of the second tooth plate, and a magnetic ring is fixedly installed on one side of the interior of the mounting sleeve, and the magnet block is adsorbed by the magnetic ring.

[0015] Preferably, the interior of the hollow rod is symmetrically provided with limiting grooves on both sides of the two sets of second tooth plates, and limiting rods are symmetrically installed on both sides of the second tooth plates, and the limiting rods are slidably connected to the limiting grooves.

[0016] Preferably, the outside of the hollow rod is symmetrically provided with two groups of through grooves located inside the second limit block, and a mounting block is fixedly installed inside the through groove, and a positioning rod is slidably connected inside the mounting block, and two groups of positioning grooves are symmetrically provided on the inner side of the second limit block, and the positioning rod is engaged and connected with the positioning groove.

[0017] Preferably, a return spring is sleeved on one side of the outer side of the two groups of positioning rods, and one end of the return spring is fixedly connected to the mounting block, and a connecting piece is fixedly installed on the other end of the return spring, and the connecting piece is fixedly connected to the positioning rod.

[0018] Preferably, the movable rod is slidably connected to the inside of the movable rod, and a pressing block is fixedly installed at one end of the movable rod, and connecting grooves are penetrated on one side of the two groups of through grooves outside the movable rod, and connecting rods are hinged on one side of the two groups of connecting grooves outside the movable rod, and the end of the connecting rod away from the movable rod is hinged to the connecting piece.

[0019] Compared with the prior art, the utility model has the following beneficial effects: the upward-turning telescopic staircase with stable support is provided with a connecting assembly at the connection between the telescopic staircase assembly and the two supporting frames, so that the mounting sleeve of the telescopic staircase assembly can reciprocate on the supporting frame during the telescopic process, and the mounting sleeve can avoid displacement during the movement, avoid affecting the stability of the telescopic staircase assembly, and facilitate lubrication, avoiding the inconvenience of moving the mounting sleeve. The specific contents are as follows:

[0020] 1. A connecting assembly is provided at the connection between the telescopic staircase assembly and the two support frames. When the telescopic staircase assembly is extended or retracted, the hollow rod can be pulled to move, so that the mounting sleeve slides on the support frame, and the telescopic staircase assembly can be guided. Subsequently, a connecting hole can be opened on the hollow rod, and a hook spring is connected through the connecting hole. The other end of the hook spring is connected to the mounting plate, which can assist the extension and retraction of the telescopic staircase assembly. During the movement, the mounting sleeve drives the first limit block and the second limit block to move on both sides of the support frame, so that the movement of the mounting sleeve is limited to avoid swinging during the movement of the mounting sleeve, thereby improving the stability of the telescopic staircase assembly. When lubricating the mounting sleeve, the movable rod is pushed to move, and the movable rod slides on the fixed block to compress the telescopic spring, and the first limit block is driven to move through the two sets of sliding rods. The movable rod moves and the connecting block is moved at the same time. The first tooth plate is moved, and the first tooth plate drives the rotating gear to rotate after the movement of the first tooth plate. After the rotating gear rotates, it drives the second tooth plate to move. After the second tooth plate moves, the magnet block is attracted to the magnetic ring inside the mounting sleeve, so that the mounting sleeve and the second limit block are driven to move in the opposite direction. There is a certain gap between the first limit block, the second limit block and the support frame, and grease or lubricating oil can be added to the pores to reduce the friction of the movement of the mounting sleeve, so as to avoid the mounting sleeve from getting stuck after long-term use, so that the movable rod is reset, and then the first limit block and the second limit block are reset. Through the connecting component, the mounting sleeve of the telescopic staircase assembly reciprocates on the support frame during the telescopic process. The mounting sleeve can avoid displacement during the movement, avoid affecting the stability of the telescopic staircase assembly, and facilitate lubrication to avoid inconvenience in moving the mounting sleeve.

[0021] 2. Before moving the movable rod, push the pressing block to drive the movable rod to move, so that the movable rod pulls the connecting rod to rotate. After the connecting rod rotates, pull the positioning rod to slide on the mounting block, so that the positioning rod is disengaged from the positioning groove, so that the second limit block loses the limit. Continuing to push the movable rod can push the movable rod to move, which facilitates the second limit block to lose the limit and facilitates the subsequent movement of the second limit block. After the positioning rod is disengaged from the positioning groove, the mounting sleeve and the second limit block can be disassembled, which is convenient for the subsequent replacement of the mounting sleeve when it is severely worn, thereby improving practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the side structure of the utility model;

[0023] Figure 2 This is a front cross-sectional structural diagram of the connection assembly of the utility model;

[0024] Figure 3 For this utility model Figure 2 A schematic diagram of the enlarged structure of the middle A area;

[0025] Figure 4 For this utility model Figure 2 Schematic diagram of the enlarged structure of the middle B area;

[0026] Figure 5 For this utility model Figure 2 Schematic diagram of the enlarged structure of the middle C area.

[0027] In the figure: 1, mounting plate; 101, mounting frame; 102, telescopic staircase assembly; 103, supporting frame; 2, connecting assembly; 201, hollow rod; 202, fixed block; 203, movable rod; 204, connecting block; 205, telescopic spring; 206, first limit block; 207, sliding rod; 208, sliding groove; 209, mounting sleeve; 2091, second limit block; 210, mounting groove; 211, rotating gear; 212, first tooth plate; 213, second tooth plate; 214, limit rod; 215, limit groove; 216, magnet block; 217, magnetic ring; 218, through groove; 219, mounting block; 220, positioning rod; 221, positioning groove; 222, reset spring; 223, connecting piece; 224, moving rod; 225, pressing block; 226, connecting groove; 227, connecting rod. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the implementation regulations described are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0029] See also Figure 1-5The utility model provides a technical solution: a stably supported upward-flipping telescopic staircase, comprising a mounting plate 1, a mounting frame 101 being symmetrically hinged on one side of the mounting plate 1, and a telescopic staircase assembly 102 being movably connected to one side of the two mounting frames 101, and a torsion spring is provided at the connection between the mounting frame 101 and the telescopic staircase assembly 102, and a support frame 103 is movably connected to one side of the two mounting frames 101, and further comprising: a connecting assembly 2 is provided at the connection between the telescopic staircase assembly 102 and the two support frames 103, wherein the connecting assembly 2 comprises a hollow rod 201 movably connected to both sides of the telescopic staircase assembly 102, and a fixed block 202 is fixedly installed on one side of the inner part of the hollow rod 201, and a movable rod 203 is slidably connected to the inner part of the fixed block 202, and the movable rod 203 is slidably connected to the hollow rod 201, wherein a telescopic spring 205 is sleeved on one side of the outer part of the movable rod 203, and the telescopic spring 205 is sleeved on one side of the outer part of the movable rod 203, and the telescopic spring One end of 205 is fixedly connected to the fixed block 202, and the other end of the telescopic spring 205 is fixedly installed with a connecting block 204, and the connecting block 204 is fixedly connected to the movable rod 203, and the outer side of the hollow rod 201 is slidably connected with a first limit block 206, and the outer side of the hollow rod 201 is located on the inner side of the first limit block 206 and symmetrically penetrates through two groups of sliding grooves 208, and the outer side of the movable rod 203 is symmetrically installed with two groups of sliding rods 207, and the sliding rods 207 are slidably connected to the sliding grooves 208, and the sliding rods 207 are fixedly connected to the first limit block 206. Through the connecting component 2, the telescopic staircase component 102 can reciprocate on the support frame 103 during the telescopic process. The installation sleeve 209 can avoid displacement during the movement, avoid affecting the stability of the telescopic staircase component 102, and facilitate lubrication to avoid the inconvenience of moving the installation sleeve 209.

[0030] The outside of the hollow rod 201 is located on one side of the first limit block 206 and is sleeved with a mounting sleeve 209, and a second limit block 2091 is fixedly installed on one side of the mounting sleeve 209, and the first limit block 206, the mounting sleeve 209 and the second limit block 2091 are all slidably connected to the support frame 103 to limit the movement of the mounting sleeve 209, and the outside of the hollow rod 201 is located on one side of the inside of the mounting sleeve 209 and is symmetrically penetrated with two groups of mounting grooves 210, and the inside of the mounting groove 210 is rotatably connected with a rotating gear 211, and two groups of first tooth plates 212 are symmetrically installed on the outside of the connecting block 204, and the first tooth plates 212 and the rotating gears 211 are symmetrically connected. 211 is meshedly connected, and one side of the rotating gear 211 is meshedly connected with a second tooth plate 213, and a magnet block 216 is fixedly installed on one side of the second tooth plate 213, and a magnetic ring 217 is fixedly installed on one side of the inner side of the mounting sleeve 209, and the magnet block 216 and the magnetic ring 217 are attracted to each other, so that the movement of the second tooth plate 213 can drive the movement of the mounting sleeve 209, and the inner side of the hollow rod 201 is symmetrically provided with limiting grooves 215 on both sides of the two groups of second tooth plates 213, and limiting rods 214 are symmetrically installed on both sides of the second tooth plate 213, and the limiting rods 214 are slidably connected with the limiting grooves 215, so as to control the movement of the second tooth plate 213. The hollow rod 201 is provided with two sets of through grooves 218 symmetrically on the inside of the second limit block 2091, and a mounting block 219 is fixedly installed on the inside of the through groove 218, and a positioning rod 220 is slidably connected to the inside of the mounting block 219, and two sets of positioning grooves 221 are symmetrically provided on the inner side of the second limit block 2091, and the positioning rod 220 is engaged with the positioning groove 221 to position the second limit block 2091, and a return spring 222 is sleeved on one side of the outer side of the two sets of positioning rods 220, and one end of the return spring 222 is fixedly connected to the mounting block 219, and the other end of the return spring 222 is fixedly installed A connecting piece 223 is installed, and the connecting piece 223 is fixedly connected to the positioning rod 220, so that the positioning rod 220 can automatically reset after moving, the movable rod 203 is internally slidably connected to the moving rod 224, and a pressing block 225 is fixedly installed at one end of the moving rod 224, and the movable rod 203 is externally provided with connecting grooves 226 on one side of the two groups of through grooves 218, and the movable rod 203 is externally provided with connecting rods 227 on one side of the two groups of connecting grooves 226, and the connecting rod 227 is hinged to the connecting piece 223 at one end away from the moving rod 224, so that the movement of the moving rod 224 can drive the positioning rod 220 to move.

[0031] Working principle: Before using this kind of stably supported upward telescopic staircase, you need to check the overall condition of the device to make sure it can work normally. Figure 1 - Figure 5As shown, a connecting assembly 2 is provided at the connection between the telescopic staircase assembly 102 and the two support frames 103. When the telescopic staircase assembly 102 is extended, the hollow rod 201 can be pulled to move, so that the mounting sleeve 209 slides on the support frame 103, and the telescopic staircase assembly 102 can be guided. Subsequently, a connecting hole can be opened on the hollow rod 201, and a hook spring can be connected through the connecting hole. The other end of the hook spring is connected to the mounting plate 1, which can assist the extension and retraction of the telescopic staircase assembly 102. The mounting sleeve 209 is in the moving process. The first limiting block 206 and the second limiting block 2091 are driven to move on both sides of the support frame 103, so as to limit the movement of the installation sleeve 209, prevent the installation sleeve 209 from swinging during the movement, and improve the stability of the telescopic staircase assembly 102. When the installation sleeve 209 is lubricated, the movable rod 203 is pushed to move. The movable rod 203 slides on the fixed block 202 to compress the telescopic spring 205, and the first limiting block 206 is driven to move through the two sets of sliding rods 207. The movable rod 203 moves and drives the connecting block 204 to move at the same time. The first tooth plate 212 moves, and after the first tooth plate 212 moves, it drives the rotating gear 211 to rotate. After the rotating gear 211 rotates, it drives the second tooth plate 213 to move. After the second tooth plate 213 moves, the magnet block 216 is attracted to the magnetic ring 217 inside the installation sleeve 209, so that the installation sleeve 209 and the second limit block 2091 move in the opposite direction. There is a certain gap between the first limit block 206, the second limit block 2091 and the support frame 103, and grease or lubricating oil can be added in the pores to reduce The friction force of the installation sleeve 209 during movement can prevent the installation sleeve 209 from getting stuck after long-term use, so that the movable rod 203 is reset, and then the first limit block 206 and the second limit block 2091 are reset. The installation sleeve 209 can be reciprocated on the support frame 103 during the telescopic staircase assembly 102 through the connecting assembly 2. The installation sleeve 209 can avoid displacement during the movement, avoid affecting the stability of the telescopic staircase assembly 102, and facilitate lubrication to avoid inconvenience in the movement of the installation sleeve 209.

[0032] Before moving the movable rod 203, push the pressing block 225 to drive the movable rod 224 to move, so that the movable rod 224 pulls the connecting rod 227 to rotate. After the connecting rod 227 rotates, it pulls the positioning rod 220 to slide on the mounting block 219, so that the positioning rod 220 is disengaged from the positioning groove 221, so that the second limit block 2091 loses its limit. Continuing to push the movable rod 224 can push the movable rod 203 to move, which facilitates the second limit block 2091 to lose its limit and facilitates the subsequent movement of the second limit block 2091. After the positioning rod 220 is disengaged from the positioning groove 221, the mounting sleeve 209 and the second limit block 2091 can be disassembled, which is convenient for the subsequent replacement of the mounting sleeve 209 when it is severely worn, thereby improving practicality.

[0033] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art may still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A stably supported upward-turning telescopic staircase, comprising a mounting plate (1); A mounting frame (101) is symmetrically hinged on one side of the mounting plate (1), and a telescopic staircase assembly (102) is movably connected to one side of the two mounting frames (101), and a torsion spring is provided at the connection between the mounting frame (101) and the telescopic staircase assembly (102), and a support frame (103) is movably connected to one side of the two mounting frames (101); It is characterized in that Also includes: The connection points between the telescopic staircase assembly (102) and the two support frames (103) are both provided with connection assemblies (2); The connection assembly (2) comprises a hollow rod (201) movably connected to both sides of the telescopic staircase assembly (102), a fixed block (202) is fixedly installed on one side of the interior of the hollow rod (201), a movable rod (203) is slidably connected inside the fixed block (202), and the movable rod (203) is slidably connected to the hollow rod (201); The movable rod (203) is sleeved with a telescopic spring (205) on one side of the outside, and one end of the telescopic spring (205) is fixedly connected to the fixed block (202), and the other end of the telescopic spring (205) is fixedly installed with a connecting block (204), and the connecting block (204) is fixedly connected to the movable rod (203), and the outer side of the hollow rod (201) is slidably connected to a first limit block (206), and two groups of sliding grooves (208) are symmetrically opened and penetrated on the inner side of the first limit block (206) on the outside of the hollow rod (201), and two groups of sliding rods (207) are symmetrically installed on one side of the outside of the movable rod (203), and the sliding rods (207) are slidably connected to the sliding grooves (208), and the sliding rods (207) are fixedly connected to the first limit block (206).

2. The stably supported upward-turning telescopic staircase according to claim 1, characterized in that: The outside of the hollow rod (201) is sleeved with a mounting sleeve (209) on one side of the first limiting block (206), and a second limiting block (2091) is fixedly mounted on one side of the mounting sleeve (209), and the first limiting block (206), the mounting sleeve (209) and the second limiting block (2091) are all slidably connected to the support frame (103).

3. The stably supported upward-turning telescopic staircase according to claim 2, characterized in that: The outside of the hollow rod (201) is symmetrically provided with two groups of mounting grooves (210) on one side of the inside of the mounting sleeve (209), and the inside of the mounting groove (210) is rotatably connected to a rotating gear (211), and two groups of first tooth plates (212) are symmetrically installed on the outside of the connecting block (204), and the first tooth plates (212) are meshingly connected to the rotating gear (211), and one side of the rotating gear (211) is meshingly connected to a second tooth plate (213), and a magnet block (216) is fixedly installed on one side of the second tooth plate (213), and a magnetic ring (217) is fixedly installed on one side of the inside of the mounting sleeve (209), and the magnet block (216) and the magnetic ring (217) are attracted to each other.

4. The stably supported upward-turning telescopic staircase according to claim 3, characterized in that: The inside of the hollow rod (201) is provided with symmetrically arranged limit slots (215) on both sides of the two sets of second tooth plates (213), and limit rods (214) are symmetrically installed on both sides of the second tooth plates (213), and the limit rods (214) are slidably connected to the limit slots (215).

5. The stably supported upward-turning telescopic staircase according to claim 2, characterized in that: The hollow rod (201) is symmetrically provided with two groups of through grooves (218) located inside the second limit block (2091), and a mounting block (219) is fixedly installed inside the through groove (218), and a positioning rod (220) is slidably connected inside the mounting block (219), and two groups of positioning grooves (221) are symmetrically provided on the inner side of the second limit block (2091), and the positioning rod (220) is snap-fitted and connected with the positioning groove (221).

6. The stably supported upward-turning telescopic staircase according to claim 5, characterized in that: A return spring (222) is sleeved on one side of the exterior of the two groups of positioning rods (220), one end of the return spring (222) is fixedly connected to the mounting block (219), and a connecting piece (223) is fixedly installed on the other end of the return spring (222), and the connecting piece (223) is fixedly connected to the positioning rod (220).

7. The stably supported upward-turning telescopic staircase according to claim 6, characterized in that: The movable rod (203) is slidably connected to a moving rod (224) inside, and a pressing block (225) is fixedly installed on one end of the moving rod (224), and a connecting groove (226) is penetrated on one side of the two groups of through grooves (218) outside the movable rod (203), and a connecting rod (227) is hinged on one side of the two groups of connecting grooves (226) outside the moving rod (224), and one end of the connecting rod (227) away from the moving rod (224) is hinged to the connecting piece (223).

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