An underwater cleaning robot

Abstract

This invention provides an underwater cleaning robot comprising a main body, a suction motor, and a roller brush assembly. The main body has an internal cavity and a suction port at its bottom. The suction motor is located within the cavity and generates suction to draw external debris into the cavity through the suction port. The roller brush assembly includes a roller brush motor, a connector, and a roller brush. The roller brush motor is located within the cavity, and the connector is mounted on the main body. The connector is connected to the roller brush motor, and the roller brush is engaged with the connector. The roller brush is detachable from the connector. The roller brush motor drives the connector to rotate around its axis, which in turn drives the roller brush to rotate synchronously, pushing external debris towards the suction port. Because the roller brush is engaged with the connector and is detachable from it, maintenance or replacement of the roller brush is convenient; simply remove the roller brush from the connector.

Description

Technical Field

[0001] This invention relates to the field of cleaning technology, and in particular to an underwater cleaning robot. Background Technology

[0002] The existing underwater cleaning robot's roller brush is generally located at the front of the robot and is cylindrical. The roller brush contacts the ground and rotates around its own axis to roll up the debris near the robot's suction port. However, the existing roller brush is fixed at the front of the robot and is large in size, which makes it expensive and inconvenient to maintain and replace, resulting in high maintenance costs. Summary of the Invention

[0003] Therefore, the main objective of this invention is to provide an underwater cleaning robot that facilitates the maintenance and replacement of the roller brush.

[0004] To achieve the above objectives, the present invention provides an underwater cleaning robot, comprising:

[0005] The main body has an internal cavity, and a water inlet is provided at the bottom of the main body, which is connected to the cavity.

[0006] A suction motor, disposed within the receiving cavity, is used to generate suction force to draw external debris into the receiving cavity through the suction port; and

[0007] A roller brush assembly includes a roller brush motor, a connector, and a roller brush. The roller brush motor is disposed within the receiving cavity. The connector is disposed on the main body and partially extends from the bottom of the main body. The connector is connected to the roller brush motor. The roller brush is engaged with the end of the connector away from the roller brush motor, and the roller brush is detachable from the connector. The roller brush is positioned near the suction port. The roller brush motor drives the connector to rotate around the axis of the roller brush motor, thereby causing the connector to drive the roller brush to rotate synchronously, so that the roller brush pushes the external debris towards the suction port.

[0008] Preferably, the roller brush includes a rotating component and a brush strip, the brush strip being disposed on the outer periphery of the rotating component, the rotating component being engaged with the connecting component, and the rotating component being detachable from the connecting component.

[0009] Preferably, the number of brush strips is at least two, and the at least two brush strips are spaced apart on the outer periphery of the rotating member.

[0010] Preferably, the rotating component has a first through hole, and a first stop and a second stop are provided on the inner wall of the first through hole. The first stop and the second stop are located at different heights on the inner wall of the first through hole. The end of the rotating component facing the connecting component also has a first notch. The outer wall of the connecting component is provided with an annular retaining strip, which is made of plastic material. The outer wall of the connecting component is also provided with a protrusion. The rotating component is used to be sleeved on the connecting component, and the protrusion is accommodated in the first notch. The annular retaining strip can be held between the first stop and the second stop to realize the engagement of the rotating component with respect to the connecting component.

[0011] Preferably, the number of the first stop and the second stop is at least two.

[0012] Preferably, the outer diameter of the annular strip gradually decreases from the middle to both ends.

[0013] Preferably, a positioning member is provided at the bottom of the main body, and the positioning member has a second through hole that communicates with the receiving cavity. The connecting member includes a first connecting part and a second connecting part connected to each other. The outer diameter of the first connecting part is smaller than the inner diameter of the second through hole, and the outer diameter of the second connecting part is larger than the inner diameter of the second through hole. The annular retaining strip is located on the outer side wall of the first connecting part, and the protrusion is located on the outer side wall of the first connecting part. The outer diameter of the first connecting part plus the height of the protrusion in the radial direction of the first connecting part is greater than the inner diameter of the second through hole. The positioning member can be held between the protrusion and the second connecting part, thereby realizing the connection of the connecting member relative to the main body.

[0014] Preferably, a fixing member is connected to the roller brush motor, and the fixing member is splinedly connected to the connecting member, thereby realizing the connection between the roller brush motor and the connecting member.

[0015] Preferably, the main body includes an upper shell and a lower shell, which together form the receiving cavity. The water suction port is located at the bottom of the lower shell. The connector is disposed on the main body and extends partially from the bottom of the main body. The suction motor and the roller brush motor are both connected to the upper shell.

[0016] Preferably, the upper shell and the lower shell are detachably connected by a snap fastener.

[0017] The advantages of this invention are as follows: The underwater cleaning robot is placed in the pool to be cleaned. The roller brush motor and the suction motor are activated. The roller brush motor drives the connecting piece to rotate around its axis, which in turn drives the roller brush to rotate synchronously. This causes the roller brush to push the debris at the bottom of the pool towards the suction port. The suction motor generates suction force to draw the debris into the receiving cavity through the suction port, thus cleaning the debris in the pool. Because the roller brush and the connecting piece are interlocked and detachable, maintenance or replacement of the roller brush can be easily achieved by simply removing it from the connecting piece. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, 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 the present invention. For those skilled in the art, other drawings can be obtained based on the devices shown in these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the structure of an underwater cleaning robot according to one embodiment;

[0020] Figure 2 This is a schematic diagram of the structure of a roller brush assembly according to one embodiment;

[0021] Figure 3 This is a schematic diagram of the structure of a roller brush according to one embodiment;

[0022] Figure 4 This is a schematic diagram of the structure of a connector according to one embodiment;

[0023] Figure 5 This is a schematic diagram illustrating the engagement of a roller brush and a connector in one embodiment.

[0024] Figure 6 This is a schematic diagram illustrating the cooperation between the lower shell and the roller brush assembly in one embodiment;

[0025] Figure 7 for Figure 6 Enlarged view of point A;

[0026] Figure 8 A cross-sectional view of the lower shell and the roller brush assembly in one embodiment;

[0027] Figure 9 for Figure 8 Enlarged view of point B;

[0028] Figure 10 This is a schematic diagram illustrating the fit between a roller brush motor and a fixing component in one embodiment.

[0029] Figure 11This is a schematic diagram showing the engagement of the lower shell and the roller brush assembly at another angle in one embodiment.

[0030] The components are as follows: 100. Main body; 110. Upper shell; 120. Lower shell; 121. Inlet; 130. Receiving cavity; 140. Positioning component; 141. Second through hole; 142. Second notch; 150. First barrel-shaped structure; 160. Second barrel-shaped structure; 200. Sewage suction motor; 300. Roller brush assembly; 310. Roller brush motor; 320. Connector; 321. First connecting part; 3211. Annular retaining strip; 3212. Protrusion; 322. Second connecting part; 323. Internal spline; 330. Roller brush; 331. Rotating component; 3311. Mounting groove; 3312. First through hole; 3313. First stop block; 3314. Second stop block; 3315. First notch; 332. Brush strip; 400. Fixing component; 410. External spline; 500. Rotating wheel.

[0031] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0032] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0033] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of the components in a specific posture (as shown in the attached figure). If the specific posture changes, the directional indication will also change accordingly. Furthermore, the descriptions involving "first," "second," etc., in the present invention are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the term "and / or" throughout the text includes three solutions. Taking A and / or B as an example, it includes technical solution A, technical solution B, and a technical solution that simultaneously satisfies A and B. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by the present invention.

[0034] like Figure 1-2As shown, an underwater cleaning robot includes a main body 100, a suction motor 200, and a roller brush assembly 300. The main body 100 has an internal cavity 130, and a water inlet 121 is located at the bottom of the main body 100, communicating with the cavity 130. The suction motor 200 is disposed within the cavity 130 and generates suction to draw external debris into the cavity 130 through the water inlet 121. The roller brush assembly 300 includes a roller brush motor 310, a connector 320, and a roller brush 330. The roller brush assembly 300 is disposed within the cavity 130. Inside cavity 130, connector 320 is disposed on main body 100 and partially extends from bottom of main body 100. Connector 320 is connected to roller brush motor 310. Roller brush 330 is engaged with the end of connector 320 away from roller brush motor 310. Roller brush 330 is detachable from connector 320. Roller brush 330 is disposed near suction port 121. Roller brush motor 310 is used to drive connector 320 to rotate around axis of roller brush motor 310. In turn, connector 320 drives roller brush 330 to rotate synchronously so that roller brush 330 pushes external garbage toward suction port 121.

[0035] The underwater cleaning robot is placed in the pool to be cleaned, and the roller brush motor 310 and the suction motor 200 are started. The roller brush motor 310 drives the connector 320 to rotate around the axis of the roller brush motor 310. In turn, the connector 320 drives the roller brush 330 to rotate synchronously, so that the roller brush 330 pushes the garbage at the bottom of the pool toward the suction port 121. The suction motor 200 generates suction force to suck the garbage into the receiving cavity 130 through the suction port 121, thereby cleaning the garbage in the pool. Since the roller brush 330 of this application is snapped into the connector 320 and is detachable from the connector 320, when maintenance or replacement of the roller brush 330 is required, the roller brush 330 can be directly pulled off the connector 320, making the maintenance and replacement of the roller brush 330 very convenient.

[0036] In this embodiment, both the suction motor 200 and the roller brush motor 310 are waterproofed.

[0037] Further, refer to Figure 2 The roller brush 330 includes a rotating part 331 and a brush strip 332. The brush strip 332 is disposed on the outer periphery of the rotating part 331. The rotating part 331 is engaged with the connecting part 320, and the rotating part 331 is detachable from the connecting part 320. Specifically, the roller brush motor 310 drives the connecting part 320 and the rotating part 331 to rotate around the axis of the roller brush motor 310, thereby the rotating part 331 drives the brush strip 332 to rotate, so that the brush strip 332 pushes the garbage at the bottom of the pool toward the suction port 121.

[0038] Further, refer to Figure 3 The side wall of the rotating component 331 is provided with a mounting groove 3311, and the brush strip 332 is partially housed in the mounting groove 3311.

[0039] Further, refer to Figure 3 The number of brush strips 332 is at least two, and the at least two brush strips 332 are spaced apart on the outer periphery of the rotating member 331. Specifically, multiple brush strips 332 rotate around the axis of the roller brush motor 310 at the same time, which can more reliably drive external garbage to the vicinity of the suction port 121. Furthermore, the number of mounting slots 3311 is the same as that of brush strips 332, and the mounting slots 3311 correspond one-to-one with the brush strips 332. In this embodiment, the number of brush strips 332 is three.

[0040] Furthermore, brush strip 332 is made of plastic.

[0041] Further, refer to Figure 3-5 The rotating member 331 has a first through hole 3312. A first stop 3313 and a second stop 3314 are provided on the inner wall of the first through hole 3312. The first stop 3313 and the second stop 3314 are located at different heights on the inner wall of the first through hole 3312. The end of the rotating member 331 facing the connector 320 also has a first notch 3315. An annular retaining strip 3211 is provided on the outer wall of the connector 320. The annular retaining strip 3211 is made of plastic material. The outer wall of the connector 320 also has a protrusion 3212. The rotating member 331 is used to be sleeved on the connector 320, and the protrusion 3212 is accommodated in the first notch 3315. The annular retaining strip 3211 can be held between the first stop 3313 and the second stop 3314 to realize the engagement of the rotating member 331 with respect to the connector 320.

[0042] Specifically, the protrusion 3212 of the connector 320 is accommodated within the first notch 3315 of the rotating member 331 to prevent the rotating member 331 from rotating relative to the connector 320, thereby enabling the connector 320 to drive the rotating member 331 to rotate synchronously; the annular retaining strip 3211 of the connector 320 can be held between the first stop 3313 and the second stop 3314 of the rotating member 331, thereby limiting the axial movement of the rotating member 331 relative to the connector 320, thus ensuring that the rotating member 331 will not detach from the connector 320; furthermore, since the annular retaining strip 3211 is made of plastic material, when it is necessary to disassemble the roller brush 330, a more flexible material can be used. A large external force pulls the rotating component 331 to deform the annular retaining strip 3211, thereby pulling the rotating component 331 off the connecting component 320. Conversely, when the roller brush 330 needs to be installed, the rotating component 331 is aligned with the connecting component 320, and then a large external force is used to press the rotating component 331, causing the annular retaining strip 3211 to be pressed and deformed. This causes the first stop 3313 to pass over the annular retaining strip 3211, while the second stop 3314 does not pass over the annular retaining strip 3211. Thus, the annular retaining strip 3211 is held between the first stop 3313 and the second stop 3314, thereby realizing the installation of the rotating component 331 relative to the connecting component 320.

[0043] Further, refer to Figure 3 The number of first stop blocks 3313 and second stop blocks 3314 is at least two. At least two first stop blocks 3313 are spaced apart on the inner wall of the first through hole 3312 and are located at the same height on the inner wall of the first through hole 3312. At least two second stop blocks 3314 are spaced apart on the inner wall of the first through hole 3312 and are located at the same height on the inner wall of the first through hole 3312. Specifically, the annular retaining strip 3211 is held between at least two first stop blocks 3313 and at least two second stop blocks 3314, making the retaining of the annular retaining strip 3211 relative to the first stop blocks 3313 and the second stop blocks 3314 more reliable. This makes the axial fixation of the rotating member 331 relative to the connecting member 320 more reliable, thereby ensuring that the rotating member 331 will not detach from the connecting member 320.

[0044] Further, refer to Figure 4 There are two protrusions 3212 on the outer wall of the connector 320, and the two protrusions 3212 are arranged opposite to each other. There are two first notches 3315 on the rotating member 331, and the two first notches 3315 are arranged opposite to each other. The protrusions 3212 and the first notches 3315 correspond one to one. The two protrusions 3212 are housed in their respective first notches 3315, which can more reliably prevent the rotating member 331 from rotating relative to the connector 320, thereby more reliably ensuring that the connector 320 can drive the rotating member 331 to rotate synchronously.

[0045] Further, refer to Figure 4 The outer diameter of the annular retaining strip 3211 gradually decreases from the middle to both ends, thereby ensuring that when the roller brush 330 needs to be disassembled or installed, the annular retaining strip 3211 can be more easily held between the first stop block 3313 and the second stop block 3314.

[0046] Further, refer to Figure 4 and 6 -9. A positioning member 140 is provided at the bottom of the main body 100. The positioning member 140 has a second through hole 141, which communicates with the receiving cavity 130. The connector 320 includes a first connecting part 321 and a second connecting part 322 connected to each other. The outer diameter of the first connecting part 321 is smaller than the inner diameter of the second through hole 141, and the outer diameter of the second connecting part 322 is larger than the inner diameter of the second through hole 141. The annular retaining strip 3211 is located on the outer side wall of the first connecting part 321, and the protrusion 3212 is located on the outer side wall of the first connecting part 321. The outer diameter of the first connecting part 321 plus the height of the protrusion 3212 in the radial direction of the first connecting part 321 is greater than the inner diameter of the second through hole 141. The positioning member 140 can be held between the protrusion 3212 and the second connecting part 322, thereby realizing the connection between the connector 320 and the main body 100.

[0047] Further, refer to Figure 4 and Figure 7 The positioning member 140 has a second notch 142, which communicates with the second through hole 141. The second notch 142 is adapted to the protrusion 3212 of the connector 320. Specifically, after the roller brush 330 (or the rotating member 331 of the rotating member 331) is removed from the connector 320, the connector 320 is rotated so that the protrusion 3212 of the connector 320 is aligned with the second notch 142, and then the connector 320 is pressed so that the connector 320 can be removed from the positioning member 140. When there are two protrusions 3212 on the connector 320, the connector 320 is rotated so that the protrusion 3212 of the connector 320 is aligned with the second notch 142. One of the protrusions 3212 of the connector 320 is aligned with the second notch 142. Then, the connector 320 is pressed so that the first protrusion 3212 passes through the second notch 142. Then, the connector 320 is rotated so that the other protrusion 3212 of the connector 320 is aligned with the second notch 142. Then, the connector 320 is pressed so that the second protrusion 3212 passes through the second notch 142. This allows the connector 320 to be removed from the positioning member 140, making the maintenance and replacement of the connector 320 very convenient. When the connector 320 is damaged, only the connector 320 needs to be replaced.

[0048] Further, refer to Figure 1The number of roller brush assemblies 300 is at least two. At least two roller brush assemblies 300 can more reliably push external debris toward the vicinity of the suction port 121. In this embodiment, the number of positioning members 140 is the same as that of roller brush assemblies 300, and the positioning members 140 correspond one-to-one with the roller brush assemblies 300. The number of suction ports 121 is also the same as that of roller brush assemblies 300, and the suction ports 121 correspond one-to-one with the roller brush assemblies 300.

[0049] Further, refer to Figure 1 and Figure 10 A fixing part 400 is connected to the roller brush motor 310. The fixing part 400 is splinedly connected to the connecting part 320, thereby realizing the connection between the roller brush motor 310 and the connecting part 320.

[0050] Further, refer to Figure 2 , Figure 4 and Figure 10 The fastener 400 has an external spline 410, and the connector 320 has an internal spline 323. The external spline 410 is adapted to the internal spline 323, and the external spline 410 is housed within the internal spline 323 to achieve spline connection between the fastener 400 and the connector 320.

[0051] Further, refer to Figure 1 The main body 100 includes an upper shell 110 and a lower shell 120, which together form a receiving cavity 130. The suction port 121 is located at the bottom of the lower shell 120. The connector 320 is disposed on the lower shell 120 and extends partially from the bottom of the lower shell 120. The suction motor 200 and the roller brush motor 310 are both connected to the upper shell 110. Specifically, when the upper shell 110 is disassembled, the upper shell 110 can drive the suction motor 200 and the roller brush motor 310 to be disassembled together.

[0052] Furthermore, the upper shell 110 and the lower shell 120 are detachably connected by snap-fit. Specifically, the upper shell 110 and the lower shell 120 are connected by snap-fit, which makes disassembly convenient and facilitates the inspection and maintenance of the components inside the main body 100.

[0053] Further, refer to Figure 1 and Figure 11 The lower shell 120 is specifically recessed in the direction of the upper shell 110 to form a first barrel-shaped structure 150 with openings at both ends. The first barrel-shaped structure 150 is used to accommodate the suction motor 200. Specifically, when the upper shell 110 is fastened to the lower shell 120, the suction motor 200 connected to the upper shell 110 will be accommodated in the first barrel-shaped structure 150.

[0054] Further, refer to Figure 1 and Figure 11The lower shell 120 is specifically recessed towards the upper shell 110 to form a second barrel-shaped structure 160 with openings at both ends. The second barrel-shaped structure 160 is used to accommodate the roller brush motor 310. Specifically, when the upper shell 110 is fastened to the lower shell 120, the roller brush motor 310 connected to the upper shell 110 will be housed in the second barrel-shaped structure 160. In this embodiment, the number of second barrel-shaped structures 160 is the same as the number of roller brush assemblies 300, and the second barrel-shaped structure 160 corresponds one-to-one with the roller brush motor 310.

[0055] Furthermore, a filter screen is provided between the upper shell 110 and the lower shell 120, and a drain outlet is provided on the upper shell 110. Specifically, under the suction action of the suction motor 200, external garbage is sucked into the receiving cavity 130 through the suction port 121, and then filtered by the filter screen. Subsequently, the filtered liquid is discharged through the drain outlet, while the garbage and dirt blocked by the filter screen remain in the receiving cavity 130 between the lower shell 120 and the filter screen.

[0056] Further, refer to Figure 1 The main body 100 is provided with a rotating wheel 500 at its bottom. The rotating wheel 500 can drive the main body 100 to move, so that the underwater cleaning robot can clean different areas. Specifically, in this embodiment, after the filtered liquid is discharged through the drain outlet, it generates a force opposite to the direction of the drain outlet, thereby driving the rotating wheel 500 to rotate, so as to drive the main body 100 to move in the opposite direction to the direction of liquid discharge. In this embodiment, the rotating wheel 500 is located at the bottom of the lower shell 120.

[0057] Further, refer to Figure 1 There are two rotating wheels 500, which are spaced apart at the bottom of the lower shell 120.

[0058] The above are merely preferred embodiments of the present invention and do not limit the patent scope of the present invention. Any equivalent device transformations made based on the inventive concept of the present invention and the contents of the specification and drawings of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. An underwater cleaning robot, characterized in that, include: The main body has an internal cavity, and a water inlet is provided at the bottom of the main body, which is connected to the cavity. A suction motor is installed inside the receiving cavity. The suction motor is used to generate suction force to draw external garbage into the receiving cavity through the water inlet. and A roller brush assembly includes a roller brush motor, a connector, and a roller brush. The roller brush motor is disposed within the receiving cavity. The connector is disposed on the main body and partially extends from the bottom of the main body. The connector is connected to the roller brush motor. The roller brush is engaged with the end of the connector away from the roller brush motor, and the roller brush is detachable from the connector. The roller brush is positioned near the suction port. The roller brush motor drives the connector to rotate around the axis of the roller brush motor, thereby the connector drives the roller brush to rotate synchronously, so that the roller brush pushes the external debris toward the suction port. The roller brush includes a rotating component and a brush strip. The brush strip is disposed on the outer periphery of the rotating component. The rotating component is engaged with the connecting component, and the rotating component is detachable from the connecting component. The rotating component has a first through hole, and a first stop and a second stop are provided on the inner wall of the first through hole. The first stop and the second stop are located at different heights on the inner wall of the first through hole. The end of the rotating component facing the connecting component also has a first notch. The outer wall of the connecting component is provided with an annular retaining strip, which is made of plastic material. The outer wall of the connecting component is also provided with a protrusion. The rotating component is used to be sleeved on the connecting component, and the protrusion is accommodated in the first notch. The annular retaining strip can be held between the first stop and the second stop to realize the engagement of the rotating component with respect to the connecting component. The bottom of the main body is provided with a positioning member, which has a second through hole that communicates with the receiving cavity. The connector includes a first connecting part and a second connecting part connected to each other. The outer diameter of the first connecting part is smaller than the inner diameter of the second through hole, and the outer diameter of the second connecting part is larger than the inner diameter of the second through hole. The annular retaining strip is located on the outer side wall of the first connecting part, and the protrusion is located on the outer side wall of the first connecting part. The outer diameter of the first connecting part plus the height of the protrusion in the radial direction of the first connecting part is greater than the inner diameter of the second through hole. The positioning member can be held between the protrusion and the second connecting part, thereby realizing the connection of the connector relative to the main body. The number of brush strips is at least two, and the at least two brush strips are spaced apart on the outer periphery of the rotating member.

2. The underwater cleaning robot as described in claim 1, characterized in that, The number of the first stop and the second stop is at least two.

3. The underwater cleaning robot as described in claim 1, characterized in that, The outer diameter of the ring-shaped card gradually decreases from the middle to both ends.

4. The underwater cleaning robot as described in claim 1, characterized in that, A fixing component is connected to the roller brush motor, and the fixing component is splinedly connected to the connecting component, thereby realizing the connection between the roller brush motor and the connecting component.

5. The underwater cleaning robot as described in claim 1, characterized in that, The main body includes an upper shell and a lower shell, which together form the receiving cavity. The water inlet is located at the bottom of the lower shell. The connector is disposed on the main body and extends partially from the bottom of the main body. The suction motor and the roller brush motor are both connected to the upper shell.

6. The underwater cleaning robot as described in claim 5, characterized in that, The upper shell and the lower shell are detachably connected by snap fasteners.

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