Handrail turnover mechanism and bathing chair

Abstract

The utility model provides a kind of handrail turnover mechanism and bath chair, handrail turnover mechanism, including seat body, rotating piece, positioning piece and handrail, rotating piece is rotationally connected in the side surface of seat body;Positioning piece is located in the front side of rotating piece, positioning piece is installed in the side surface of seat body, and positioning piece is equipped with inserting hole;Handrail has first fixed part and second fixed part, first fixed part is fixed in rotating piece, and second fixed part is inserted in inserting hole;Second fixed part can be separated from inserting hole, and handrail can be turned over backwards relative to seat body by rotating piece.The handrail turnover mechanism and bath chair of the utility model can improve the technical problem that the handrail turnover mechanism of bath chair is poor in reliability.

Description

Technical Field

[0001] This utility model belongs to the field of rehabilitation equipment technology, and more specifically, it relates to an armrest flipping mechanism and a shower chair. Background Technology

[0002] In daily life, shower chairs provide great convenience for people with limited mobility, such as the elderly, disabled, or frail, allowing them to maintain a seated posture while showering, increasing safety and comfort. As people's demands for quality of life increase and their care for special groups grows, the design and function of shower chairs are constantly evolving and improving.

[0003] Most shower chairs on the market are equipped with foldable armrests, a design primarily intended to facilitate entry and exit. When entering the chair, the armrests can be folded open to provide more space; once inside, they can be folded back to offer support and protection.

[0004] However, many shower chairs on the market currently have significant shortcomings in securing their armrests after they have been flipped back to their original position. Some shower chairs use a pin-and-ball buckle system, which is simple but prone to loosening after prolonged use. For example, after repeated flipping and securing operations, the elasticity of the pin-and-ball buckles gradually decreases, making it difficult to lock them in place, thus preventing the armrests from being securely fixed to the seat. Utility Model Content

[0005] The purpose of this utility model embodiment is to provide an armrest flipping mechanism and a shower chair to improve the technical problem of poor reliability of the armrest flipping mechanism of the shower chair.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is: to provide a handrail flipping mechanism, comprising:

[0007] seat body;

[0008] A rotating component is rotatably connected to the side of the base body;

[0009] A positioning element, located on the front side of the rotating element, is mounted on the side of the base body and has a insertion hole; and

[0010] The armrest has a first fixing part and a second fixing part. The first fixing part is fixed to the rotating member, and the second fixing part is inserted into the insertion hole. The second fixing part can be disengaged from the insertion hole, and the armrest can be flipped backward relative to the seat body by the rotating member.

[0011] Optionally, a first connecting member is detachably connected to the side of the seat, and the rotating member is rotatably sleeved on the outside of the first connecting member;

[0012] The side of the base is detachably connected to a second connector, and the positioning member is sleeved on the outside of the second connector.

[0013] Optionally, the side of the base is provided with a first mounting channel and a second mounting channel;

[0014] The fixed end of the first connector is inserted into the first mounting channel, and the first connector is locked in the first mounting channel by the first locking member;

[0015] The fixed end of the second connector is inserted into the second mounting channel, and the second connector is locked in the second mounting channel by the second locking member.

[0016] Optionally, the first locking member is elastically floating on the surface of the fixed end of the first connector. The base is provided with a first positioning hole, which communicates with the first mounting channel. The first locking member is located in the first positioning hole, and the first locking member can be disengaged from the first positioning hole by pressing the first locking member.

[0017] The second locking member floats elastically on the surface of the fixed end of the second connector. The base is provided with a second positioning hole, which communicates with the second mounting channel. The second locking member is located in the second positioning hole. By pressing the second locking member, the second locking member can be disengaged from the second positioning hole.

[0018] Optionally, the first connecting member is provided with a third locking member, the rotating member is provided with a limiting groove, the third locking member is located in the limiting groove, and the third locking member and the limiting groove cooperate to limit the flipping angle of the handrail;

[0019] The third locking member floats elastically on the surface of the first connecting member, and the third locking member can be disengaged from the limiting groove by pressing the third locking member;

[0020] The positioning member is locked to the second connecting member by a fourth locking member. The fourth locking member is elastically floating on the surface of the second connecting member. The positioning member is provided with a third positioning hole, and the fourth locking member is located in the third positioning hole. By pressing the fourth locking member, the fourth locking member can be disengaged from the third positioning hole.

[0021] Optionally, the side of the seat is provided with a first groove, the first groove being located above the rotating member; and / or,

[0022] The side of the base is provided with a second groove, which is located above the rotating component.

[0023] Optionally, the positioning member is further provided with a through hole, which communicates with the insertion hole.

[0024] This utility model also provides a bath chair, comprising:

[0025] The armrest tilting mechanism described above;

[0026] Backrest, detachably connected to the rear side of the seat; and

[0027] The support feet are detachably connected to the bottom of the base.

[0028] Optionally, the backrest is connected to a fixing member, and the rear side of the seat body is provided with a third mounting channel. The fixing end of the fixing member is inserted into the third mounting channel. The fixing member is locked in the third mounting channel by a fifth locking member, which elastically floats on the surface of the fixing member. The seat body is provided with a fourth positioning hole corresponding to the fifth locking member. The fourth positioning hole communicates with the third mounting channel. The fifth locking member is located in the fourth positioning hole, and pressing the fifth locking member can disengage it from the fourth positioning hole; and / or,

[0029] The bottom of the base is provided with a fourth mounting channel. The fixed end of the support leg is inserted into the fourth mounting channel. The fixed end of the support leg is locked in the fourth mounting channel by a sixth locking member. The sixth locking member elastically floats on the surface of the fixed end of the support leg. The base is provided with a fifth positioning hole corresponding to the sixth locking member. The fifth positioning hole communicates with the fourth mounting channel. The sixth locking member is located in the fifth positioning hole. By pressing the sixth locking member, the sixth locking member can be disengaged from the fifth positioning hole.

[0030] Optionally, the support leg has a hollow cavity, and the shower chair further includes:

[0031] A foot pad is installed at the end of the support leg away from the shower chair. The bottom of the foot pad has a drain hole that communicates with the hollow cavity.

[0032] The beneficial effects of the armrest flipping mechanism and shower chair provided by this utility model are as follows: When the user needs to enter the seat, the armrest can be flipped backward relative to the seat through the rotating part, so that the second fixing part of the armrest is disengaged from the insertion hole, providing the user with more spacious space; after the user enters the seat, the armrest can be flipped forward relative to the seat through the rotating part, so that the second fixing part of the armrest is inserted into the insertion hole. Compared with the fixing method of the ball buckle, the insertion hole can firmly fix the second fixing part, and there will be no loosening due to elastic fatigue, which can provide stable support and protection for the user. Attached Figure Description

[0033] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0034] Figure 1 This is a schematic diagram of the handrail flipping mechanism provided in one state according to an embodiment of the present utility model;

[0035] Figure 2 A schematic diagram of the handrail flipping mechanism provided in an embodiment of this utility model in another state;

[0036] Figure 3 A partially exploded view of the handrail tilting mechanism provided in an embodiment of this utility model;

[0037] Figure 4 A side view of the base provided in an embodiment of this utility model;

[0038] Figure 5 A schematic diagram showing the connection details of the handrail of the handrail flipping mechanism provided in this embodiment of the utility model;

[0039] Figure 6 for Figure 5 Enlarged view of region A in the middle;

[0040] Figure 7 for Figure 5 Enlarged view of region B in the middle;

[0041] Figure 8 A schematic diagram of the structure of the shower chair provided in this embodiment of the utility model;

[0042] Figure 9 A partial explosion diagram of the shower chair provided in this embodiment of the utility model;

[0043] Figure 10 for Figure 9 Enlarged view of region C in the middle;

[0044] Figure 11 for Figure 9 A magnified diagram of region D in the middle.

[0045] The following are the labeling elements in the figure:

[0046] 100 - Handrail flipping mechanism; 110 - Seat; 111 - First mounting channel; 1111 - First positioning hole; 112 - Second mounting channel; 1121 - Second positioning hole; 113 - First groove; 114 - Second groove; 115 - Third mounting channel; 1151 - Fourth positioning hole; 116 - Fourth mounting channel; 1161 - Fifth positioning hole; 120 - Rotating component; 121 - Fixing hole; 122 - Limiting groove; 130 - Positioning component; 131 - Insertion hole 132-Third positioning hole, 133-Through hole, 140-Armrest, 141-First fixing part, 142-Second fixing part, 150-First connecting piece, 151-First locking piece, 152-Third locking piece, 160-Second connecting piece, 161-Second locking piece, 162-Fourth locking piece, 200-Backrest, 210-Fixing piece, 211-Fifth locking piece, 300-Supporting foot, 310-Sixth locking piece, 400-Foot pad, 410-Drain hole. Detailed Implementation

[0047] To make the technical problems, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0048] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0049] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation 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.

[0050] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0051] Please see Figures 1 to 3 This utility model provides a handrail flipping mechanism 100, including a seat 110, a rotating component 120, a positioning component 130, and a handrail 140.

[0052] The rotating member 120 and the positioning member 130 are mounted on the side of the base 110, with the positioning member 130 located in front of the rotating member 120. More specifically, the rotating member 120 is rotatably connected to the side of the base 110.

[0053] It should be noted that when a user is sitting on seat 110, the user's left and / or right sides are defined as the side, the user's front direction is defined as the front side, and the user's back direction is defined as the rear side.

[0054] The positioning member 130 is provided with a insertion hole 131. The armrest 140 has a first fixing part 141 and a second fixing part 142. The first fixing part 141 is fixed to the rotating member 120, and the second fixing part 142 is inserted into the insertion hole 131. The second fixing part 142 can disengage from the insertion hole 131, and the armrest 140 can be flipped backward relative to the seat 110 by the rotating member 120.

[0055] In this structure, when a user needs to enter the seat 110, the armrest 140 can be flipped backward relative to the seat 110 by the rotating member 120, so that the second fixing part 142 of the armrest 140 disengages from the insertion hole 131, providing the user with more spacious space; after the user enters the seat 110, the armrest 140 can be flipped forward relative to the seat 110 by the rotating member 120, so that the second fixing part 142 of the armrest 140 is inserted into the insertion hole 131.

[0056] Compared to the pin buckle fixing method, the insertion hole 131 can circumferentially limit the second fixing part 142, thereby firmly fixing the second fixing part 142 and preventing loosening due to elastic fatigue, thus providing stable support and protection for the user.

[0057] As an optional implementation, the first fixing part 141 can be fixed to the rotating part 120 by riveting. For example, a rivet can be used to pass through the first fixing part 141 and the rotating part 120 to fix them together. Of course, depending on the actual situation and specific requirements, other methods such as threaded connection, welding, key connection, interference fit, and bonding can be used to fix the first fixing part 141 to the rotating part 120. There are no restrictions on the fixing method.

[0058] Specifically, the rotating part 120 is provided with a fixing hole 121 corresponding to the first fixing part 141. The first fixing part 141 is inserted into the fixing hole 121. A rivet is used to pass through the rotating part 120 and the first fixing part 141, thereby fixing the first fixing part 141 to the rotating part 120.

[0059] As an optional implementation, armrests 140, rotating parts 120 and positioning parts 130 are connected to both opposite sides of the seat 110. Of course, depending on the actual situation and specific requirements, armrests 140, rotating parts 120 and positioning parts 130 can also be provided on only one side of the seat 110. There is no unique limitation here.

[0060] Specifically, in combination Figures 1 to 3 A first connecting member 150 is detachably connected to the side of the seat 110. A rotating member 120 is rotatably sleeved on the first connecting member 150, so that the armrest 140 can be rotatably connected to the seat 110 via the rotating member 120. A second connecting member 160 is detachably connected to the side of the seat 110. A positioning member 130 is sleeved on the second connecting member 160, so that the positioning member 130 is installed on the side of the seat 110.

[0061] Specifically, in combination Figures 3 to 6 The side of the base 110 is provided with a first mounting channel 111 and a second mounting channel 112. The fixed end of the first connector 150 is inserted into the first mounting channel 111, and the first connector 150 is locked in the first mounting channel 111 by a first locking member 151, thereby making the first connector 150 stably fixed to the side of the base 110. The fixed end of the second connector 160 is inserted into the second mounting channel 112, and the second connector 160 is locked in the second mounting channel 112 by a second locking member 161, thereby making the second connector 160 stably fixed to the side of the base 110.

[0062] As an optional implementation method, combined with Figure 3 , Figure 4 , Figure 5 and Figure 6The first locking member 151 elastically floats on the surface of the fixed end of the first connecting member 150. The base 110 is provided with a first positioning hole 1111, which communicates with the first mounting channel 111. The first locking member 151 is located in the first positioning hole 1111. By pressing the first locking member 151, the first locking member 151 can be disengaged from the first positioning hole 1111. With this structure, the first connecting member 150 can be quickly disassembled and assembled, which is convenient for user operation.

[0063] As an optional implementation method, combined with Figure 3 , Figure 4 , Figure 5 and Figure 7 The second locking member 161 elastically floats on the surface of the fixed end of the second connecting member 160. The base 110 is provided with a second positioning hole 1121, which communicates with the second mounting channel 112. The second locking member 161 is located in the second positioning hole 1121. By pressing the second locking member 161, it can be disengaged from the second positioning hole 1121. With this structure, the second connecting member 160 can be quickly disassembled and assembled, which is convenient for user operation.

[0064] Specifically, in combination Figure 3 and Figure 6 The first connector 150 is provided with a third locking member 152 on its periphery. The part of the rotating member 120 that is sleeved on the first connector 150 is provided with a limiting groove 122. The third locking member 152 is located in the limiting groove 122. The third locking member 152 and the limiting groove 122 cooperate to limit the flipping angle of the handrail 140.

[0065] Furthermore, the third locking member 152 elastically floats on the surface of the first connecting member 150. By pressing the third locking member 152, it can be disengaged from the limiting groove 122. According to the user's needs, the third locking member 152 can be pressed to disengage from the limiting groove 122, thereby removing the limitation on the flipping angle of the armrest 140 and achieving a larger flipping angle.

[0066] Specifically, in combination Figure 3 and Figure 7 The positioning member 130 is locked to the second connecting member 160 by the fourth locking member 162. The fourth locking member 162 elastically floats on the surface of the second connecting member 160. The portion of the positioning member 130 that is fitted onto the second connecting member 160 has a third positioning hole 132, and the fourth locking member 162 is located in the third positioning hole 132. By pressing the fourth locking member 162, the fourth locking member 162 can be disengaged from the third positioning hole 132. With this structure, quick assembly and disassembly between the positioning member 130 and the second connecting member 160 can be achieved, facilitating user operation.

[0067] Specifically, such as Figure 4As shown, the side of the seat 110 is provided with a first groove 113, which is located above the rotating member 120. With this structure, by reducing the thickness difference between the area corresponding to the first connecting member 150 and adjacent areas on the seat 110, the problem of uneven thickness in the area of ​​the seat 110 corresponding to the first connecting member 150 can be effectively avoided. If the thickness of this area is uneven, the area of ​​the seat 110 corresponding to the first connecting member 150 is prone to deformation during the thermal expansion and contraction manufacturing process.

[0068] Specifically, such as Figure 4 As shown, a second groove 114 is provided on the side of the seat 110, and the second groove 114 is located above the rotating member 120. This structure avoids excessive thickness in the area of ​​the seat 110 corresponding to the second connecting member 160, reduces the thickness difference between this area and adjacent areas, and prevents deformation of this area due to thermal expansion and contraction during the manufacturing process. By reducing the thickness difference between the area of ​​the seat 110 corresponding to the second connecting member 160 and adjacent areas, the problem of uneven thickness in the area of ​​the seat 110 corresponding to the second connecting member 160 can be effectively avoided. If the thickness of this area is uneven, the area of ​​the seat 110 corresponding to the second connecting member 160 is prone to deformation during the thermal expansion and contraction process.

[0069] Specifically, such as Figure 7 As shown, the bottom of the positioning member 130 is also provided with a through hole 133, which communicates with the insertion hole 131. In this structure, the through hole 133 can drain water and prevent water from accumulating in the insertion hole 131.

[0070] Please see Figure 8 and Figure 9 At the same time, combined Figures 1 to 7 This utility model also provides a shower chair, including the aforementioned armrest flipping mechanism 100, backrest 200, and support legs 300. The backrest 200 is detachably connected to the rear side of the seat body 110. The support legs 300 are detachably connected to the bottom of the seat body 110.

[0071] Specifically, in combination Figures 8 to 10The backrest 200 is connected to a fastener 210. The rear side of the seat 110 is provided with a third mounting channel 115. The fixed end of the fastener 210 is inserted into the third mounting channel 115. The fastener 210 is locked in the third mounting channel 115 by a fifth locking member 211. The fifth locking member 211 floats elastically on the surface of the fixed end of the fastener 210. The seat 110 is provided with a fourth positioning hole 1151 corresponding to the fifth locking member 211. The fourth positioning hole 1151 communicates with the third mounting channel 115. The fifth locking member 211 is located in the fourth positioning hole 1151. By pressing the fifth locking member 211, the fifth locking member 211 can be disengaged from the fourth positioning hole 1151.

[0072] Specifically, in combination Figure 8 , Figure 9 and Figure 11 The bottom of the base 110 is provided with a fourth mounting channel 116. The fixed end of the support foot 300 is inserted into the fourth mounting channel 116. The fixed end of the support foot 300 is locked in the fourth mounting channel 116 by a sixth locking member 310. The sixth locking member 310 elastically floats on the surface of the fixed end of the support foot 300. The base 110 is provided with a fifth positioning hole 1161 corresponding to the sixth locking member 310. The fifth positioning hole 1161 communicates with the fourth mounting channel 116. The sixth locking member 310 is located in the fifth positioning hole 1161. By pressing the sixth locking member 310, the sixth locking member 310 can be disengaged from the fifth positioning hole 1161.

[0073] It is worth mentioning that the rear side of the seat 110 is provided with a third groove and a fourth groove. The third groove is located above the third mounting channel 115, and the fourth groove is located above the fourth mounting channel 116. The third groove and the fourth groove can improve the thickness difference problem of the area of ​​the seat 110 corresponding to the fastener 210, and avoid deformation of the area of ​​the seat 110 corresponding to the fastener 210 during the production process.

[0074] Specifically, such as Figure 9 As shown, the shower chair also includes a foot pad 400, which is installed at the end of the support leg 300 away from the shower chair. The support leg 300 has a hollow cavity, and the bottom of the foot pad 400 has a drain hole 410 that communicates with the hollow cavity. This structure can prevent water from accumulating in the hollow cavity.

[0075] As an optional implementation, the first locking element 151 can be a spring ball, a snap ring ball, or a spring plate ball. Of course, depending on the actual situation and specific requirements, the first locking element 151 can also be other elastic elements, as long as the first locking element 151 has the function of elastic floating. Similarly, the second locking element 161, the third locking element 152, the fourth locking element 162, the fifth locking element 211, and the sixth locking element 310 can also be spring balls, snap ring balls, spring plate balls, or other elastic elements.

[0076] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A handrail flipping mechanism, characterized in that, include: seat body; A rotating component is rotatably connected to the side of the base body; A positioning component is located on the front side of the rotating component, the positioning component is installed on the side of the base body, and the positioning component is provided with a plug-in hole; as well as The armrest has a first fixing part and a second fixing part. The first fixing part is fixed to the rotating member, and the second fixing part is inserted into the insertion hole. The second fixing part can be disengaged from the insertion hole, and the armrest can be flipped backward relative to the seat body by the rotating member.

2. The armrest flipping mechanism as described in claim 1, characterized in that, The side of the base is detachably connected to a first connector, and the rotating component is rotatably sleeved on the outside of the first connector; The side of the base is detachably connected to a second connector, and the positioning member is sleeved on the outside of the second connector.

3. The armrest flipping mechanism as described in claim 2, characterized in that, The side of the base is provided with a first mounting channel and a second mounting channel; The fixed end of the first connector is inserted into the first mounting channel, and the first connector is locked in the first mounting channel by the first locking member; The fixed end of the second connector is inserted into the second mounting channel, and the second connector is locked in the second mounting channel by the second locking member.

4. The armrest flipping mechanism as described in claim 3, characterized in that, The first locking member floats elastically on the surface of the fixed end of the first connector. The base is provided with a first positioning hole, which communicates with the first mounting channel. The first locking member is located in the first positioning hole. By pressing the first locking member, the first locking member can be disengaged from the first positioning hole. The second locking member floats elastically on the surface of the fixed end of the second connector. The base is provided with a second positioning hole, which communicates with the second mounting channel. The second locking member is located in the second positioning hole. By pressing the second locking member, the second locking member can be disengaged from the second positioning hole.

5. The armrest flipping mechanism as described in claim 2, characterized in that, The first connecting member is provided with a third locking member, the rotating member is provided with a limiting groove, the third locking member is located in the limiting groove, and the third locking member and the limiting groove cooperate to limit the flipping angle of the handrail; The third locking member floats elastically on the surface of the first connecting member, and the third locking member can be disengaged from the limiting groove by pressing the third locking member; The positioning member is locked to the second connecting member by a fourth locking member. The fourth locking member is elastically floating on the surface of the second connecting member. The positioning member is provided with a third positioning hole, and the fourth locking member is located in the third positioning hole. By pressing the fourth locking member, the fourth locking member can be disengaged from the third positioning hole.

6. The armrest tilting mechanism as described in any one of claims 1-5, characterized in that, The side of the seat is provided with a first groove, which is located above the rotating component; and / or, The side of the base is provided with a second groove, which is located above the rotating component.

7. The armrest tilting mechanism as described in any one of claims 1-5, characterized in that, The positioning component is also provided with a through hole, which communicates with the insertion hole.

8. A bath chair, characterized in that, include: The armrest tilting mechanism as described in any one of claims 1-7; The backrest is detachably connected to the rear side of the seat body; as well as The support feet are detachably connected to the bottom of the base.

9. The shower chair as described in claim 8, characterized in that, The backrest is connected to a fixing member, and the rear side of the seat body is provided with a third mounting channel. The fixing end of the fixing member is inserted into the third mounting channel. The fixing member is locked in the third mounting channel by a fifth locking member, which elastically floats on the surface of the fixing member. The seat body is provided with a fourth positioning hole corresponding to the fifth locking member. The fourth positioning hole communicates with the third mounting channel, and the fifth locking member is located in the fourth positioning hole. Pressing the fifth locking member can disengage it from the fourth positioning hole; and / or The bottom of the base is provided with a fourth mounting channel. The fixed end of the support leg is inserted into the fourth mounting channel. The fixed end of the support leg is locked in the fourth mounting channel by a sixth locking member. The sixth locking member elastically floats on the surface of the fixed end of the support leg. The base is provided with a fifth positioning hole corresponding to the sixth locking member. The fifth positioning hole communicates with the fourth mounting channel. The sixth locking member is located in the fifth positioning hole. By pressing the sixth locking member, the sixth locking member can be disengaged from the fifth positioning hole.

10. The shower chair as described in claim 8, characterized in that, The support leg has a hollow cavity, and the shower chair also includes: A foot pad is installed at the end of the support leg away from the shower chair. The bottom of the foot pad has a drain hole that communicates with the hollow cavity.

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