Dental chair water supply system and dental chair

Abstract

The utility model discloses a dental chair water supply system and a dental chair, comprising: a support, one side of which is fixedly connected with the dental chair; the water bottle is provided with a bottle opening matched with the connecting thread section; the diaphragm water pump is connected to the top of the inner side of the cover body in a hanging manner and is provided with a water pumping pipe and a water outlet pipe, the water pumping pipe penetrates through the convex column body and extends into the water bottle, and the water outlet pipe penetrates through the cover body and is connected with a first water using end of a dental chair; the peristaltic pump is erected on the outer side of the cover body and is provided with a water supply pipe, one end of the water supply pipe is connected with an external saline bag and / or a sterile water container, and the other end of the water supply pipe is connected with a second water using end of the dental chair. Distilled water suitable for common noninvasive repair scenes (such as tooth preparation, repair, tooth filling and the like) is extracted from the water bottle through the diaphragm water pump, sterile water can be supplied through the peristaltic pump, the water supply device is used for traumatic surgical operations such as tooth extraction, implantation, root canal therapy and the like, and the water supply requirements of various scenes are met.

Description

Technical Field

[0001] This utility model relates to the field of dental equipment technology, and in particular to a dental chair water supply system and a dental chair. Background Technology

[0002] A dental chair is a platform for dental treatment where the patient lies. Treatment equipment typically includes high-speed handpieces, low-speed handpieces, and scalers. High-speed or low-speed handpieces are primarily used for tooth preparation and extraction, while scalers are mainly used for cleaning tartar. All of these processes require a water supply for cooling drills or burs, promptly cleaning bloodstains during the procedure, and facilitating monitoring of the surgical progress. While tap water can be used, its quality often precludes direct use during surgery, potentially leading to wound infection. Some dental chairs on the market provide distilled water via a water bottle, which is sufficient for some non-invasive treatments, but not adequate for invasive surgical procedures. Furthermore, the water bottle is threaded onto a bracket next to the chair for support. The weight of a water bottle filled with water can cause deformation of the bottle opening, thread unraveling, or the bottle falling off. Deformation of the bottle opening can also prevent the bottle from being properly secured and used. Utility Model Content

[0003] The purpose of this utility model is to provide a dental chair water supply system and a dental chair to solve one or more technical problems existing in the prior art, and at least provide a beneficial option or create conditions.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows: First, this utility model provides a dental chair water supply system, including:

[0005] The bracket is fixedly connected to the dental chair on one side, and a support plate and a cover on the support plate are fixedly installed on the other side. The support plate has a through hole in the middle.

[0006] The connecting structure has a lower cover plate, a connecting column, and an upper cover plate. The upper cover plate is fixedly connected to the connecting column, the support plate, and the lower cover plate in sequence by bolts. The lower cover plate and the connecting column are provided with a central hole coaxial with the through hole. The connecting column is provided with a connecting thread section. The upper cover plate is provided with a protruding column in the middle, and a connecting gap is formed between the protruding column and the connecting thread section.

[0007] A water bottle has a bottle mouth that mates with the connecting threaded section, and the bottle mouth is screwed into the connecting gap for connection and fixation;

[0008] A diaphragm water pump is suspended from the top inside the cover and is equipped with a water intake pipe and a water outlet pipe. The water intake pipe passes through the convex column and extends into the water bottle, while the water outlet pipe passes through the cover and connects to the first water supply end of the dental chair.

[0009] A peristaltic pump is mounted on the outside of the enclosure and has a water supply pipe. One end of the water supply pipe is connected to an external saline bag and / or a sterile water container, and the other end is connected to the second water supply end of the dental chair.

[0010] Compared to traditional systems, the dental chair water supply system provided by this invention uses a diaphragm pump to extract distilled water suitable for general non-invasive restorative scenarios (such as tooth preparation, restoration, filling, etc.) from a water bottle. At the same time, it can supply sterile water through a peristaltic pump for invasive surgical procedures such as tooth extraction, implantation, root canal treatment, etc., meeting the water supply needs of multiple scenarios.

[0011] Furthermore, in the water bottle hoisting process, this technical solution utilizes a protruding column that extends into the bottle mouth. The connection gap between the protruding column and the threaded section can effectively prevent deformation of the bottle mouth under stress, avoiding bottle mouth disengagement and water bottle falling off. It also makes the water bottle hoisting more stable and improves the stability of the water supply system.

[0012] As an extension of the above solution, the convex cylinder has a central cavity, the upper part of which is open, and at least three openings are radially distributed through the central cavity from the central axis. The openings are circumferentially distributed, and a sliding wedge is provided at each opening. The outer surface of the sliding wedge is an arc surface, which, together with the outer surface of the convex cylinder, forms a complete columnar side surface. The inner surface of the sliding wedge is an inclined conical surface that is inclined outward from the top and towards the central axis from the bottom. A frustum is provided inside the central cavity, which is larger at the top and smaller at the bottom. The inclined side surface of the frustum is in contact with the inclined conical surface. When the frustum moves axially along the central axis, it pushes the sliding wedge to move radially outward along the central axis and abut against the inner side of the bottle mouth.

[0013] In this extended solution, after the bottle neck is screwed into the connecting thread section, the downward movement of the frustum compresses the sliding wedge block to slide outward along the radial direction of the central axis at the opening. The outer side of the sliding wedge block abuts against the inner side of the bottle neck, thereby stabilizing the shape of the bottle neck and improving the connection stability between the bottle neck and the connecting thread section. At the same time, the outer side of the sliding wedge block is an arc surface, which can better adapt to different bottle neck wall thicknesses. At least three sliding wedge blocks are circumferentially distributed, which can provide stable support for the entire bottle neck, making the outer side of the bottle neck fit more stably with the connecting thread section and effectively preventing the threads from coming off.

[0014] As an extension of the above solution, the upper cover plate is provided with a flange with internal threads, and the top of the truncated cone is provided with a rotating rod. The rotating rod has a lifting thread section corresponding to the flange position. The end of the rotating rod protrudes through the cover and is provided with a knob. The rotating rod rotates under the control of the knob. Under the action of the lifting thread section, the rotational motion is converted into the lifting motion of the truncated cone, thereby pushing the sliding wedge towards the bottle mouth. Due to the action of the lifting thread section, the sliding wedge will not retract under force when it abuts the inside of the bottle mouth. The lifting thread section, the rotating rod, and the truncated cone provide rigid support for the sliding wedge.

[0015] As an extension of the above solution, a sealing ring is provided at the top of the connection gap. The sealing ring acts as a flexible limit after the water bottle mouth is screwed into the connecting thread section, and at the same time provides a sealing performance between the top surface of the water bottle mouth and the connecting thread section, ensuring that the distilled water in the water bottle will not leak from the connection gap, and also effectively preventing external bacteria and impurities from entering the water bottle through the connection gap and contaminating the liquid.

[0016] As an extension of the above solution, the central cavity protrudes inward between adjacent openings to form a convex portion, the two sides of which are in contact with the sides of the sliding wedge. The contact between the sides of the convex portion and the sides of the sliding wedge limits the sliding direction of the sliding wedge, prevents the sliding wedge from changing direction radially along the central axis, and improves the stability of sliding.

[0017] As an extension of the above solution, the protrusion is provided with a through hole connecting the inner space of the water bottle and the inner space of the cover, and the bottom of the protruding column is provided with an annular ultraviolet lamp tube. The power supply cable of the annular ultraviolet lamp tube is electrically connected to the drive circuit board through the through hole.

[0018] In this extended solution, an electrical connection channel is established within the compact and narrow space of the bottle opening, enabling the ring-shaped ultraviolet lamp to be electrified inside the water bottle for sterilization, thereby further improving the cleanliness of the water.

[0019] As an extension of the above solution, the protrusion is provided with a pressure relief hole connecting the inner space of the water bottle and the inner space of the cover, and the cover and / or the support plate are provided with vent holes. As distilled water is drawn out of the water bottle, the pressure inside the water bottle changes, affecting the pumping efficiency of the diaphragm pump. High-power pumping may even cause the water bottle to deform. The pressure relief hole can effectively maintain the pressure balance inside the water bottle and ensure smooth water output from the diaphragm pump. In this extended technical solution, the vent hole can be independently set, or it can be a gap in the cover for the passage of relevant water pipes to achieve the ventilation effect.

[0020] As an extension of the above solution, the protrusion is provided with a water pipe hole connecting the inner space of the water bottle and the inner space of the cover. The water pump's suction pipe extends into the water bottle through the water pipe hole. By establishing a water pipe arrangement channel in the compact and narrow space of the bottle opening, the movement of the sliding wedge and the frustum is not affected, avoiding movement interference of the docking structure while ensuring the normal operation of the pumping function.

[0021] As an extension of the above solution, the cover is provided with hooks for hanging saline bags and / or sterile water containers. The hooks have insertion terminals for inserting the saline bags and / or sterile water containers, and one end of the peristaltic pump's water supply pipe is connected to the insertion terminal. This extension offers high flexibility; the hooks with insertion terminals are inserted into the corresponding saline bags and / or sterile water containers during use and can be removed when not in use, providing more space for the operator.

[0022] On the other hand, this utility model also provides a dental chair, including a dental chair water supply system as described above. This utility model uses a diaphragm water pump to extract distilled water suitable for general non-invasive restorative scenarios (such as tooth preparation, restoration, filling, etc.) from a water bottle, and can also supply sterile water through a peristaltic pump for invasive surgical procedures, such as tooth extraction, implantation, root canal treatment, etc., meeting the water supply needs of multiple scenarios. Attached Figure Description

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments;

[0024] Figure 1 This is a schematic diagram of the dental chair water supply system in an embodiment;

[0025] Figure 2 This is an exploded structural diagram of the connection structure in the embodiment;

[0026] Figure 3 This is a schematic diagram of the convex cylinder in the embodiment;

[0027] Figure 4 This is a schematic diagram of the convex cylinder in the embodiment.

[0028] In the attached diagram: 100: bracket, 110: support plate, 111: through hole, 120: cover, 121: hook, 200: connecting structure, 210: lower cover plate, 220: connecting column, 230: upper cover plate, 240: convex column, 241: central cavity, 242: sliding wedge, 243: protrusion, 244: through hole, 245: annular ultraviolet lamp tube, 246: pressure relief hole, 247: water pipe hole, 250: connecting gap, 251: sealing ring, 260: truncated cone, 261: rotating rod, 262: lifting threaded section, 263: knob, 270: flange, 300: water bottle, 310: bottle mouth, 400: diaphragm water pump, 410: water suction pipe, 420: water outlet pipe, 500: peristaltic pump. Detailed Implementation

[0029] This section will describe in detail the specific embodiments of the present utility model. The preferred embodiments of the present utility model are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present utility model, but they should not be construed as limiting the scope of protection of the present utility model.

[0030] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0031] In the description of this utility model, if there are words such as "several", they mean one or more, "multiple" means two or more, "greater than", "less than", "exceeding" etc. are understood to exclude the number itself, and "above", "below", "within" etc. are understood to include the number itself.

[0032] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0033] Reference Figures 1 to 4 The following are several embodiments of a dental chair water supply system and a dental chair according to the present invention.

[0034] like Figure 1 and 2 As shown, in some embodiments, a dental chair water supply system includes:

[0035] The bracket 100 is fixedly connected to the dental chair on one side, and a support plate 110 and a cover 120 disposed on the support plate 110 are fixedly provided on the other side. The support plate 110 has a through hole 111 in the middle.

[0036] The connecting structure 200 has a lower cover plate 210, a connecting post 220, and an upper cover plate 230. The upper cover plate 230 is fixedly connected to the connecting post 220, the support plate 110, and the lower cover plate 210 in sequence by bolts. The lower cover plate 210 and the connecting post 220 are provided with a central hole coaxial with the through hole 111. The connecting post 220 is provided with a connecting thread section. The upper cover plate 230 is provided with a protruding post 240 in the middle, and a connecting gap 250 is formed between the protruding post 240 and the connecting thread section.

[0037] A water bottle 300 has a bottle mouth 310 that mates with the connecting thread section, and the bottle mouth 310 is screwed into the connecting gap 250 for connection and fixation.

[0038] A diaphragm water pump 400 is suspended on the top of the inner side of the cover 120 and is provided with a water suction pipe 410 and a water outlet pipe 420. The water suction pipe 410 passes through the protruding column 240 and extends into the water bottle 300, and the water outlet pipe 420 passes through the cover 120 and is connected to the first water supply end of the dental chair.

[0039] A peristaltic pump 500 is mounted on the outside of the cover 120 and is equipped with a water supply pipe. One end of the water supply pipe is connected to an external saline bag and / or a sterile water container, and the other end is connected to the second water supply end of the dental chair.

[0040] In this embodiment, the water bottle is provided with an external thread section that matches the connecting thread section. The water bottle is screwed upward into the connecting gap to achieve hoisting and fixing. During hoisting and fixing, the convex column is inserted into the mouth of the water bottle. The convex column can effectively prevent the mouth of the bottle from deforming under force, avoid the mouth of the bottle from coming off the fastener and the water bottle from falling off, and make the hoisting of the water bottle more stable, thereby improving the stability of the water supply system.

[0041] Compared to traditional methods, this embodiment uses a diaphragm pump to extract distilled water suitable for general non-invasive restorative scenarios (such as tooth preparation, restoration, filling, etc.) from a water bottle. At the same time, it can supply sterile water through a peristaltic pump for invasive surgical procedures such as tooth extraction, implantation, root canal treatment, etc., meeting the water supply needs of multiple scenarios.

[0042] like Figure 2 and Figure 3As shown, the convex cylinder 240 has a central cavity 241, which is open at the top and has at least three openings radially through it from the central axis. The openings are circumferentially distributed, and a sliding wedge 242 is provided at each opening. The outer surface of the sliding wedge 242 is an arc surface, which forms a complete columnar side surface with the outer surface of the convex cylinder 240. The inner surface of the sliding wedge 242 is an inclined conical surface that is inclined outward from the top and towards the central axis from the bottom. A frustum 260, which is larger at the top and smaller at the bottom, is provided inside the central cavity 241. The inclined side surface of the frustum 260 is in contact with the inclined conical surface. When the frustum 260 moves axially along the central axis, it pushes the sliding wedge 242 to move radially outward along the central axis and abut against the inner side of the bottle mouth 310.

[0043] In this embodiment, after the bottle neck is screwed into the connecting thread section, the downward movement of the frustum converts the axial downward movement of the frustum into the radial movement of the central axis of the sliding wedge by using the contact between the inclined side and the inclined cone surface. The sliding wedge is squeezed to slide outward at the opening along the radial direction of the central axis, and the outer side of the sliding wedge abuts against the inner side of the bottle neck, thereby stabilizing the shape of the bottle neck and improving the connection stability between the bottle neck and the connecting thread section. At the same time, the outer side of the sliding wedge is a curved surface, which can better adapt to different bottle neck wall thicknesses.

[0044] In this embodiment, three sliding wedges are arranged in a circular pattern. In some optional solutions, four, five, or other sliding wedges can be used depending on the size of the space within the central cavity or actual needs. At least three sliding wedges can provide stable support for the entire bottle opening, making the outer side of the bottle opening fit more stably with the connecting threaded section and effectively preventing thread stripping.

[0045] like Figure 1 and 2 As shown, in some embodiments, the upper cover plate 230 is provided with a flange 270 with internal threads, and the top of the frustum 260 is provided with a rotating rod 261. The rotating rod 261 is provided with a lifting thread section 262 corresponding to the flange 270. The end of the rotating rod 261 protrudes through the cover 120 and is provided with a knob 263. The rotating rod rotates under the control of the knob, and under the action of the lifting thread section, the rotational motion is converted into the lifting motion of the frustum, thereby pushing the sliding wedge towards the bottle mouth. Due to the action of the lifting thread section, the sliding wedge will not retract under force when it abuts the inner side of the bottle mouth. The lifting thread section, the rotating rod, and the frustum provide rigid support for the sliding wedge.

[0046] like Figure 2In some embodiments, a sealing ring 251 is provided at the top of the connection gap 250. The sealing ring acts as a flexible limit after the water bottle mouth is screwed into the connecting thread section, and at the same time provides a sealing performance between the top surface of the water bottle mouth and the connecting thread section, ensuring that the distilled water in the water bottle will not leak from the connection gap, and also effectively preventing external bacteria and impurities from entering the water bottle from the connection gap and contaminating the liquid.

[0047] like Figure 2 and Figure 3 As shown, in some embodiments, the central cavity 241 protrudes inward between adjacent openings to form a protrusion 243, the two sides of which are in contact with the sides of the sliding wedge 242. The contact between the sides of the protrusion 243 and the sides of the sliding wedge 242 limits the sliding direction of the sliding wedge, prevents the sliding wedge from changing direction radially along the central axis, and improves the stability of sliding.

[0048] like Figure 1 and Figure 3 and Figure 4 As shown, in some embodiments, the protrusion 243 is provided with a through hole 244 connecting the inner space of the water bottle 300 and the inner space of the cover 120, and the bottom of the protruding column 240 is provided with an annular ultraviolet lamp tube 245. The power supply cable of the annular ultraviolet lamp tube 245 is electrically connected to the drive circuit board through the through hole 244.

[0049] In this embodiment, an electrical connection channel is established in the compact and narrow space of the bottle opening 310, enabling the annular ultraviolet lamp 245 to be electrically powered and sterilized inside the water bottle 300, thereby further improving the cleanliness of the water.

[0050] like Figure 1 and 3 As shown, in some embodiments, the protrusion 243 is provided with a pressure relief hole 246 connecting the inner space of the water bottle 300 and the inner space of the cover 120, and the cover 120 and / or the support plate 110 are provided with vent holes. As distilled water is drawn out of the water bottle, the pressure inside the water bottle changes, affecting the pumping efficiency of the diaphragm pump. High-power pumping may even cause the water bottle to deform. The pressure relief hole can effectively maintain the pressure balance inside the water bottle and ensure smooth water output from the diaphragm pump. In this embodiment, the vent hole can be independently set, or it can be a gap in the cover for the passage of relevant water pipes to achieve the ventilation effect.

[0051] like Figure 1 and 3As shown, in some embodiments, the protrusion 243 is provided with a water pipe hole 247 connecting the inner space of the water bottle 300 and the inner space of the cover 120. The water pump 410 of the diaphragm pump 400 extends into the water bottle 300 through the water pipe hole 247. By establishing a water pipe arrangement channel in the compact and narrow space of the bottle opening, the movement of the sliding wedge and the frustum is not affected, avoiding motion interference of the docking structure while ensuring the normal operation of the pumping function.

[0052] like Figure 1 and 3 As shown, in some embodiments, the cover 120 is provided with hooks 121 for hanging saline bags and / or sterile water containers. The hooks 121 have insertion ends for inserting the saline bags and / or sterile water containers, and one end of the water supply pipe of the peristaltic pump 500 is connected to the insertion end. This embodiment offers high flexibility; the hooks have insertion ends that allow them to be inserted into the corresponding saline bags and / or sterile water containers during use and can be removed when not in use, providing more space for the operator.

[0053] On the other hand, embodiments of this utility model also provide a dental chair, including a dental chair water supply system as described in one or more of the above-described embodiments. This embodiment uses a diaphragm pump to extract distilled water suitable for general non-invasive restorative scenarios (such as tooth preparation, restoration, filling, etc.) from a water bottle, while simultaneously supplying sterile water via a peristaltic pump for invasive surgical procedures such as tooth extraction, implantation, and root canal treatment, thus meeting the water supply needs of various scenarios.

[0054] The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited to the described embodiments. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention, and these equivalent modifications or substitutions are all included within the scope defined by the claims of this application.

Claims

1. A dental chair water supply system, characterized in that, include: The bracket (100) is fixedly connected to the dental chair on one side and a support plate (110) and a cover (120) on the support plate (110) are fixedly provided on the other side. The support plate (110) has a through hole (111) in the middle. The connecting structure (200) has a lower cover plate (210), a connecting post (220), and an upper cover plate (230). The upper cover plate (230) is fixedly connected to the connecting post (220), the support plate (110), and the lower cover plate (210) by bolts passing through them in sequence. The lower cover plate (210) and the connecting post (220) are provided with a central hole coaxial with the through hole (111). The connecting post (220) is provided with a connecting thread section. The upper cover plate (230) is provided with a protruding post (240) in the middle, and a connecting gap (250) is formed between the protruding post (240) and the connecting thread section. A water bottle (300) has a bottle mouth (310) that mates with the connecting thread section, the bottle mouth (310) being screwed into the connecting gap (250) for connection and fixation; A diaphragm water pump (400) is suspended on the top of the inner side of the cover (120) and is provided with a water suction pipe (410) and a water outlet pipe (420). The water suction pipe (410) passes through the protruding column (240) and extends into the water bottle (300). The water outlet pipe (420) passes through the cover (120) and is connected to the first water supply end of the dental chair. A peristaltic pump (500) is mounted on the outside of the cover (120) and has a water supply pipe. One end of the water supply pipe is connected to an external saline bag and / or a sterile water container, and the other end is connected to a second water supply end of the dental chair.

2. The dental chair water supply system according to claim 1, characterized in that: The convex cylinder (240) is provided with a central cavity (241). The upper part of the central cavity (241) is open, and at least three openings are radially penetrating the central cavity (241) from the central axis. The openings are distributed in a circular pattern. A sliding wedge (242) is provided at each opening. The outer surface of the sliding wedge (242) is a curved surface, which forms a complete columnar side surface with the outer surface of the convex cylinder (240). The inner surface of the sliding wedge (242) is an inclined conical surface that is inclined outward from the top and towards the central axis from the bottom. A frustum (260) with a larger upper part and a smaller lower part is provided in the central cavity (241). The inclined side surface of the frustum (260) is in contact with the inclined conical surface. When the frustum (260) moves axially along the central axis, it pushes the sliding wedge (242) to move radially outward along the central axis and abut against the inner side of the bottle mouth (310).

3. A dental chair water supply system according to claim 2, characterized in that: The upper cover plate (230) is provided with a flange (270) with internal threads, and the top of the truncated cone (260) is provided with a rotating rod (261). The rotating rod (261) is provided with a lifting thread section (262) corresponding to the flange (270). The end of the rotating rod (261) protrudes through the cover (120) and is provided with a knob (263).

4. A dental chair water supply system according to claim 1, characterized in that: A sealing ring (251) is provided at the top of the connection gap (250).

5. A dental chair water supply system according to claim 2, characterized in that: The central cavity (241) protrudes inward between adjacent openings to form a protrusion (243), and the two sides of the protrusion (243) are in contact with the sides of the sliding wedge (242).

6. A dental chair water supply system according to claim 5, characterized in that: The protrusion (243) is provided with a through hole (244) connecting the inner space of the water bottle (300) and the inner space of the cover (120). The bottom of the protruding column (240) is provided with an annular ultraviolet lamp tube (245). The power supply cable of the annular ultraviolet lamp tube (245) is electrically connected to the drive circuit board through the through hole (244).

7. A dental chair water supply system according to claim 5, characterized in that: The protrusion (243) is provided with a pressure relief hole (246) that connects the inner space of the water bottle (300) and the inner space of the cover (120), and the cover (120) and / or the support plate (110) are provided with ventilation holes.

8. A dental chair water supply system according to claim 5, characterized in that: The protrusion (243) is provided with a water pipe hole (247) that connects the inner space of the water bottle (300) and the inner space of the cover (120). The water pump (410) of the diaphragm water pump (400) extends into the water bottle (300) through the water pipe hole (247).

9. A dental chair water supply system according to claim 1, characterized in that: The cover (120) is provided with hooks (121) for hanging saline bags and / or sterile water containers. The hooks (121) are provided with plugs for inserting saline bags and / or sterile water containers. One end of the water supply pipe of the peristaltic pump (500) is connected to the plug.

10. A dental chair, characterized in that: Includes a dental chair water supply system as described in any one of claims 1-9.

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