Quick-assembly chair toilet

Abstract

This utility model discloses a quick-assembly commode chair, belonging to the field of commode chair technology. It uses a first fastener to connect the connecting seat and the side frame, thereby fixing the two side frames to the connecting frame and preventing the side frames from shaking. Then, the backrest frame is installed on the back of the two side frames, and the seat board is installed on the top of the two side frames. Finally, the two footrests are installed on the front of the two side frames, completing the quick assembly of the commode chair. Since the side frames are fixed to the connecting seat of the connecting frame by the first fastener after unfolding, the side frames are prevented from shaking, making the structure of the commode chair more compact and improving the structural strength.

Description

Technical Field

[0001] This utility model relates to the field of toilet chair technology, and in particular to a quick-assembly toilet chair. Background Technology

[0002] Commode chairs primarily address the toileting needs of people with mobility issues and the elderly, and are commonly used assistive devices in home daily care and institutional care. Currently, commode chairs generally have a foldable seat frame. The seat and backrest can be detached from the seat frame, allowing the frame to be folded up. Folded seat frames, seat boards, and backrests take up less space, making them easy to store and transport. However, because the seat frame is foldable, it needs to be secured with the backrest and seat board when unfolded. This requires allowance for assembly between the backrest, seat board, and seat frame, resulting in a relatively loose structure and a tendency to wobble when assembled. Utility Model Content

[0003] This utility model aims to solve at least one of the technical problems existing in the prior art. To this end, this utility model proposes a quick-assembly commode chair. Since the side frame is fixed to the connecting seat of the connecting frame by the first fastener after unfolding, the side frame is prevented from shaking, making the structure of the commode chair more compact and improving its structural strength.

[0004] The quick-assembly toilet chair according to an embodiment of the present utility model includes:

[0005] Two side frames positioned opposite each other;

[0006] The connecting frame has connecting seats at both ends, and the two connecting seats are respectively hinged to the two side frames;

[0007] Two first fasteners, which detachably connect the side frame and the connecting seat respectively, thereby restricting the degree of freedom of rotation of the side frame relative to the connecting frame;

[0008] Seat plate, detachably connected to the top of the two side frames;

[0009] The backrest frame is detachably connected to the rear of the two side frames;

[0010] Two footrests, each of which is detachably connected to the front side of the side frame.

[0011] The quick-assembly commode chair according to the present invention has at least the following beneficial effects: the connecting seat and the side frame are connected by the first fastener, thereby fixing the two side frames to the connecting frame and preventing the side frames from shaking. Then, the backrest frame is installed on the back of the two side frames, the seat is installed on the top of the two side frames, and finally the two footrests are installed on the front of the two side frames, thus completing the quick assembly of the commode chair. Since the side frames are fixed to the connecting seat of the connecting frame by the first fastener after unfolding, the side frames are prevented from shaking, making the structure of the commode chair more compact and improving the structural strength.

[0012] According to some embodiments of the present invention, each of the side frames is provided with a hinge seat and a first screw hole on the side facing the connecting frame. The two hinge seats are respectively hinged to the two connecting seats. Each connecting seat is provided with a first connecting hole that runs through the left and right sides. The first fastener passes through the first connecting hole and can be detachably engaged with the first screw hole.

[0013] According to some embodiments of the present invention, the hinge seat is hinged to the rear side of the connecting seat, the first screw hole is located on the front side of the hinge seat, and when the connecting seat abuts against the side wall of the side frame, the position of the first connecting hole corresponds to the position of the first screw hole.

[0014] According to some embodiments of the present invention, each side frame is provided with a first insertion hole at the top, the first insertion hole being located behind the seat plate, and the backrest frame is provided with two first insertion tubes at the bottom, the two first insertion tubes being inserted into the two first insertion holes respectively.

[0015] According to some embodiments of the present invention, each of the first insertion holes has a through second screw hole on its side wall, and the quick-install toilet seat also includes two second fasteners, which respectively cooperate with the two second screw holes and abut against the outer walls of the two first insertion tubes.

[0016] According to some embodiments of the present invention, each side frame is provided with a second insertion hole at its top, the second insertion hole being located in front of the seat plate, and each footrest is provided with a second insertion tube, with two second insertion tubes respectively inserted into two second insertion holes.

[0017] According to some embodiments of the present invention, each of the side frames is provided with a support seat on its front side, each of the footrests is provided with an abutment seat, the rear side of the abutment seat is provided with an abutment groove, and the front wall of the abutment groove abuts against the front wall of the support seat.

[0018] According to some embodiments of the present invention, the top of the abutting groove is provided with an abutting block, the abutting block abuts against the top of the support base, and the rear side of the abutting block abuts against the front side of the side frame.

[0019] According to some embodiments of the present invention, the bottom of the seat is provided with a plurality of fasteners, and the plurality of fasteners are respectively snapped onto the top of the two side frames.

[0020] According to some embodiments of the present invention, each side frame is provided with two third insertion holes spaced apart at the bottom, and the quick-install commode chair also includes four casters, each caster is provided with a third insertion tube at the top, and the four third insertion tubes are respectively inserted into the four third insertion holes. Attached Figure Description

[0021] Figure 1 This is a structural schematic diagram of a quick-assembly toilet chair according to an embodiment of the present invention;

[0022] Figure 2 This is an exploded view of a quick-assembly toilet chair according to an embodiment of the present invention;

[0023] Figure 3 This is a structural schematic diagram of a quick-installation toilet chair according to an embodiment of the present invention from another angle;

[0024] Figure 4 This is an exploded view of another angle of a quick-assembly toilet chair according to an embodiment of the present invention.

[0025] Reference numerals: Side frame 100, hinge seat 110, first screw hole 120, first insertion hole 130, second screw hole 131, second insertion hole 140, support seat 150, third insertion hole 160, third connecting hole 161, crossbar 170, connecting frame 200, connecting seat 210, first connecting hole 211, first fastener 300, seat plate 400, fastener 410, backrest frame 500, first insertion tube 510, armrest 520, footrest 600, second... Insert tube 610, abutment seat 620, abutment groove 621, abutment block 630, arc groove 631, foot pedal 640, fourth insert tube 641, fourth pin hole 642, fourth insertion hole 650, fourth connecting hole 651, fourth fastener 660, fourth screw 661, fourth nut 662, second fastener 700, caster 800, third insert tube 810, third pin hole 811, third fastener 820, third screw 821, third nut 822. Detailed Implementation

[0026] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0027] In the description of this utility model, it should be understood that the terms front, back, up, down, axial, circumferential, etc., 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.

[0028] In the description of this utility model, "multiple" means two or more; "greater than," "less than," and "exceeding" are understood to exclude the stated number; "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly specifying the number of indicated technical features or their sequential relationship.

[0029] In the description of this utility model, it should be noted that terms such as "setting," "installing," and "connecting" 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.

[0030] The technical solution of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described below are some embodiments of this utility model, not all embodiments.

[0031] Reference Figures 1 to 4 As shown, this utility model provides a quick-installation toilet chair.

[0032] The quick-assembly commode chair includes two side frames 100, a connecting frame 200, two first fasteners 300, a seat 400, a backrest frame 500, a footrest 600, two second fasteners 700, four third fasteners 820, two fourth fasteners 660, and four casters 800.

[0033] Reference Figure 2 and Figure 4 As shown, the two side frames 100 are distributed symmetrically in a mirror image. The two side frames 100 are respectively set at the left and right ends of the connecting frame 200. Each side frame 100 includes a longitudinal tube arranged in the front-back direction, a connecting tube arranged in the front-back direction, a first vertical tube arranged in the up-down direction, and a second vertical tube arranged in the up-down direction. The longitudinal tube and the connecting tube are arranged vertically at intervals, and the second vertical tube and the first vertical tube are arranged front-back at intervals. The longitudinal tube, the first vertical tube, the second vertical tube, and the connecting tube are connected to form a rectangular frame structure. A horizontal bar 170 is provided near the second vertical bar of the longitudinal tube in the left-right direction. The horizontal bar 170 is set on the side wall of the longitudinal bar facing the other side frame 100. The length of the two horizontal bars 170 is less than the length of the connecting frame 200 in the left-right direction.

[0034] Each connecting pipe has a hinge seat 110 on its side wall facing the connecting frame 200. The hinge seat 110 is located near the second vertical pipe. Each connecting pipe also has a first screw hole 120 that runs through the left and right direction on its side wall facing the connecting frame 200. The first screw hole 120 is located in front of the hinge seat 110.

[0035] It is understandable that the first screw hole 120 may not penetrate the connecting pipe. The first screw hole 120 extends in the left and right direction. The purpose of setting a through first screw hole 120 is to increase the screw hole depth so as to improve the thread connection strength between the first screw hole 120 and the first fastener 300.

[0036] The top of the first vertical tube is provided with a first insertion hole 130, the bottom of the first vertical tube is provided with a third insertion hole 160, and the rear side wall of the first insertion hole 130 is provided with a second screw hole 131 that extends backward.

[0037] The top of the second vertical tube is provided with a second insertion hole 140, and the bottom of the second vertical tube is provided with a third insertion hole 160. Each third insertion hole 160 has a third connecting hole 161 that runs through the left and right directions on its left and right sidewalls. A support base 150 is provided on the front side of the second vertical tube. The front sidewall of the support base 150 is arc-shaped. The top of the support base 150 is provided with an upwardly protruding limiting block. A first clearance groove that runs through the left and right sides is left between the limiting block and the front side of the second vertical tube.

[0038] Reference Figure 2 and Figure 4 As shown, the connecting frame 200 includes a connecting rod and two connecting seats 210. The connecting rod is arranged in the left-right direction, and the two connecting seats 210 are arranged at the left and right ends of the connecting rod. The connecting seats 210 are arranged in the front-back direction. The rear end of the connecting seat 210 is provided with a hinge hole that runs through in the up-down direction. The connecting seat 210 is provided with a first connecting hole 211 that runs through in the left-right direction. The first connecting hole 211 is located in front of the connecting rod.

[0039] Two connecting seats 210 respectively cooperate with the connecting tubes of the two side frames 100. In this embodiment, each connecting tube has a hinge seat 110 with a hinge shaft that runs through the vertical direction. The hinge hole at the rear end of the connecting seat 210 cooperates with the hinge shaft of the hinge seat 110, so that the side frame 100 can rotate relative to the connecting seat 210 about the vertical axis. When viewed from a top view, the side frame 100 and the connecting frame 200 can rotate and fold behind the connecting frame 200. When the two side frames 100 are unfolded to the left and right sides of the connecting frame 200, the connecting tube of the side frame 100 abuts against the side wall of the connecting seat 210 facing outward, and the first connecting hole 211 of the connecting seat 210 is directly opposite the first screw hole 120 of the connecting tube.

[0040] Reference Figure 2 and Figure 4As shown, each first fastener 300 includes a first screw and a first knob. The first knob is connected to the head of the first screw, and the tail of the first screw passes through the first connecting hole 211 of the connecting seat 210 and is screwed into the first screw hole 120, so that the connecting seat 210 is fixed to the connecting tube of the connecting frame 200, preventing the side frame 100 from rotating relative to the connecting frame 200.

[0041] Reference Figure 2 and Figure 4 As shown, each caster 800 has a third insertion tube 810 arranged in the vertical direction at its top. The side wall of the third insertion tube 810 is provided with a plurality of third pin holes 811 that pass through in the horizontal direction. The plurality of third pin holes 811 are distributed vertically at intervals.

[0042] Four casters 800 are inserted into four third insertion holes 160 respectively through third insertion tubes 810, so that the three pin holes 811 of the four casters 800 are at the same height and are directly opposite the third connection holes 161 on the side wall of the third insertion holes 160. Each third fastener 820 includes a third screw 821 and a third nut 822. The third nut 822 is provided with a third knob on the outside. The third nut 822 is placed on the side of the side frame 100 facing the connecting frame 200. The third screw 821 is screwed into the third nut 822 after passing through the third connection hole 161 and the third pin hole 811. The shape of the third connection hole 161 matches the shape of the head of the third screw 821. The head of the third screw 821 is inserted into the third connection hole 161 so that the third connection hole 161 restricts the rotation of the third screw 821. After tightening with the third knob of the third nut 822, the casters 800 are fixed to the bottom of the side frame 100. In this embodiment, all four casters 800 are omnidirectional wheels.

[0043] Reference Figures 1 to 4 As shown, the seat plate 400 has a through hole in the middle of the seat plate 400, and the seat plate 400 is also provided with a cover plate. The shape of the cover plate matches the shape of the through hole. The cover plate is detachably installed on the through hole. The bottom of the seat plate 400 is provided with multiple fasteners 410. The multiple fasteners 410 are arranged around the through hole. The bottom of each fastener 410 is provided with a slot that runs horizontally. The slot is arc-shaped. The shape of the slot matches the shape of the longitudinal tube of the side frame 100 and the shape of the crossbar 170. At least one slot of the fastener 410 is engaged with the longitudinal tube of the side frame 100, and at least one slot of the fastener 410 is engaged with the crossbar 170 of the side frame 100.

[0044] Reference Figure 3 and Figure 4As shown, in this embodiment, there are eight fasteners 410, which are symmetrically distributed on the left and right sides of the seat plate 400. Taking the four fasteners 410 located on the left side as an example, two fasteners 410 are distributed at intervals on the left side of the seat plate 400 and their slots are connected in the front-to-back direction. These two fasteners 410 are engaged with the longitudinal tube of the side frame 100. The other two fasteners 410 are distributed at intervals on the front side and their slots are connected in the left-to-right direction. These two fasteners 410 are engaged with the crossbar 170 of the side frame 100.

[0045] When using the commode chair, the user needs to remove the cover from the recess hole, and then sit on the seat 400 to use the commode chair.

[0046] Reference Figures 1 to 4 As shown, the backrest frame 500 is arranged in the vertical direction and has a back panel extending in the vertical direction. Armrests 520 are respectively arranged on the left and right sides of the backrest frame 500. The armrests 520 are hinged to the backrest frame 500. A limiting seat is provided between the armrests 520 and the backrest frame 500. The limiting seat restricts the degree of freedom of rotation of the armrests 520. The limiting seat is provided with a first limiting block and a second limiting block. The first limiting block and the second limiting block restrict the angle of rotation of the armrests 520 around the axis extending in the left and right direction. When the armrests 520 rotate upward and abut against the first limiting block, the armrests 520 are parallel to the backrest frame 500. When the armrests 520 rotate downward and abut against the second limiting block, the armrests 520 are perpendicular to the backrest frame 500 and extend forward.

[0047] The bottom of the backrest frame 500 is provided with two first insertion tubes 510. The two first insertion tubes 510 are respectively inserted into the first insertion holes 130 of the two first vertical tubes. The second fastener 700 includes a second screw and a second knob. The second knob is connected to the head of the second screw. The second screw is engaged with the second screw hole 131 of the first vertical tube. After the second screw is screwed into the second screw hole 131, it abuts against the rear side wall of the first insertion tube 510, so that the first insertion tube 510 is fixed in the first insertion hole 130. Then, the two second fasteners 700 are engaged with the two second screw holes 131 and abut against the two first insertion tubes 510, so that the backrest frame 500 is connected to the two side frames 100.

[0048] The two footrests 600 are arranged in a mirror-symmetrical manner. Each footrest 600 includes a main body, a second insertion tube 610, an abutment seat 620, an abutment block 630, a foot pedal 640, a fourth insertion tube 641, and a fourth fastener 660.

[0049] The main body is formed by bending a round tube. From top to bottom, the main body is divided into a horizontal tube and an inclined tube. The horizontal tube is positioned along the front-to-back direction, and the inclined tube is positioned along the vertical direction. The inclined tube gradually slopes forward from top to bottom. The front end of the horizontal tube is integrally formed with the top end of the inclined tube. The rear end of the horizontal tube is connected to a second insertion tube 610, which is positioned along the vertical direction. A contact seat 620 is connected to the inclined tube and extends towards the rear of the inclined tube. A contact groove 621, positioned along the vertical direction, is provided on the rear side of the contact seat 620. Located below the second insertion tube 610, the abutment groove 621 is arc-shaped, and the shape of the abutment groove 621 matches the shape of the front side wall of the support base 150. The abutment block 630 is located above the abutment groove 621, and an arc-shaped groove 631 is provided on the rear side of the abutment block 630. The shape of the arc-shaped groove 631 matches the shape of the front side of the second vertical tube of the side frame 100. A downward protruding protrusion is provided at the bottom of the abutment block 630, and a second clearance groove that runs through the left and right is left between the protrusion and the front side wall of the abutment groove 621.

[0050] Insert the second insertion tube 610 into the second insertion hole 140 of the second vertical tube of the side frame 100. First, rotate the main body to make the abutment seat 620 and the support seat 150 misaligned. Then, rotate the main body to make the abutment seat 620 rotate towards the support seat 150, so that the abutment block 630 rotates above the support seat 150. Then, the protrusion is inserted into the first clearance groove at the top of the support seat 150, and the second clearance groove is used to avoid the limiting block at the top of the support seat 150. The front side wall of the abutment groove 621 abuts against the front side wall of the support seat 150 and the limiting block, and the front side wall of the protrusion abuts against the rear side wall of the limiting block, thereby preventing the foot pedal 600 from swaying back and forth relative to the side frame 100. The bottom of the abutment block 630 abuts against the top of the support seat 150 to support the foot pedal 600. After the user steps on the foot pedal 600, the amount of deformation of the foot pedal 600 downward is reduced.

[0051] The bottom end of the inclined tube is provided with a fourth insertion hole 650, and the side wall of the fourth insertion hole 650 is provided with a fourth connecting hole 651 that runs through the front and rear direction.

[0052] Each foot pedal 640 has an upwardly extending fourth insertion tube 641 hinged to its top. After the foot pedal 640 is rotated, it can close to the fourth insertion tube 641. An anti-rotation block is provided at the bottom of the foot pedal 640. The anti-rotation block limits the rotation angle of the foot pedal 640. When the anti-rotation block abuts against the fourth insertion tube 641, the foot pedal 640 is perpendicular to the fourth insertion tube 641.

[0053] The fourth insertion tube 641 is provided with multiple fourth pin holes 642 that extend in the front-to-back direction. The multiple fourth pin holes 642 are distributed at intervals in the vertical direction. The fourth insertion tube 641 is inserted into the fourth insertion hole 650 of the foot pedal frame 600, with any one of the fourth pin holes 642 aligned with the fourth connecting hole 651 of the fourth insertion hole 650. Each fourth fastener 660 includes a fourth screw 661 and a fourth nut 662. The fourth nut 662 is provided with a fourth knob on its outside. The fourth nut 662 is placed on the rear side of the inclined tube of the foot pedal frame 600. The fourth screw 661 is screwed into the fourth nut 662 after passing through the fourth connecting hole 651. The shape of the fourth connecting hole 651 matches the head shape of the fourth screw 661. The head of the fourth screw 661 is engaged in the fourth connecting hole 651 so that the fourth connecting hole 651 restricts the rotation of the fourth screw 661. After tightening with the fourth knob of the fourth nut 662, the foot pedal 640 is fixed to the bottom of the foot pedal frame 600.

[0054] Therefore, after the production of each component of the quick-assembly commode chair is completed, the two side frames 100 rotate to the rear of the connecting frame 200 to complete the folding. The two first fasteners 300, the two second fasteners 700, the four third fasteners 820, the seat 400, the backrest frame 500, the two footrests 600 and the four casters 800 can be placed separately so that the quick-assembly commode chair can be packaged and transported separately before assembly, saving storage space.

[0055] The assembly process for a quick-assembly toilet chair is as follows: (Refer to...) Figure 2 and Figure 4 As shown, first, unfold the two side frames 100 to the left and right sides of the connecting frame 200. Then, use the first fastener 300 to connect the connecting seat 210 and the side frame 100 together to fix the side frame 100. Next, insert the four casters 800 into the four third insertion holes 160 through the third insertion tubes 810 respectively, and fix the four casters 800 with the third fasteners 820. Then, insert the two first insertion tubes 510 of the backrest frame 500 into the first insertion holes 130 of the two side frames 100 respectively. In the process, the first insertion tube 510 is fixed with the second fastener 700, the two armrests 520 are rotated down into place, and the seat 400 is then snapped onto the top of the two side frames 100 using multiple fasteners 410. Each footrest 600 and foot pedal 640 are pre-assembled. Finally, the footrest 600 is inserted into the second insertion hole 140 of the side frame 100 using the second insertion tube 610, and the abutment seat 620 and support seat 150 are engaged in place. This completes the assembly of the quick-assembly toilet chair.

[0056] When the height of the commode chair needs to be adjusted to suit users of different heights, the third pin holes 811 of the third insertion tube 810 of the caster 800 at different heights can be aligned with the third connecting hole 161 of the side frame 100, and the adjusted caster 800 can be fixed with the third fastener 820. Then, the fourth pin holes 642 of the fourth insertion tube 641 of the foot pedal 640 at different positions can be aligned with the fourth connecting hole 651, and the adjusted foot pedal 640 can be fixed with the fourth fastener 660.

[0057] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. A quick-assembly commode chair, characterized in that, include: Two side frames positioned opposite each other; The connecting frame has connecting seats at both ends, and the two connecting seats are respectively hinged to the two side frames; Two first fasteners, which detachably connect the side frame and the connecting seat respectively, thereby restricting the degree of freedom of rotation of the side frame relative to the connecting frame; Seat plate, detachably connected to the top of the two side frames; The backrest frame is detachably connected to the rear of the two side frames; Two footrests, each of which is detachably connected to the front side of the side frame.

2. The quick-assembly commode chair according to claim 1, characterized in that, Each of the side frames is provided with a hinge seat and a first screw hole on the side facing the connecting frame. The two hinge seats are respectively hinged to the two connecting seats. Each connecting seat is provided with a first connecting hole that runs through the left and right sides. The first fastener passes through the first connecting hole and can be detachably engaged with the first screw hole.

3. The quick-assembly commode chair according to claim 2, characterized in that, The hinge seat is hinged to the rear side of the connecting seat, and the first screw hole is located on the front side of the hinge seat. When the connecting seat abuts against the side wall of the side frame, the position of the first connecting hole corresponds to the position of the first screw hole.

4. The quick-assembly commode chair according to claim 1, characterized in that, Each of the side frames has a first insertion hole at the top, which is located behind the seat plate. The backrest frame has two first insertion tubes at the bottom, which are respectively inserted into the two first insertion holes.

5. The quick-assembly commode chair according to claim 4, characterized in that, Each of the first insertion holes has a through second screw hole on its side wall. The quick-install toilet seat also includes two second fasteners, which respectively engage with the two second screw holes and abut against the outer walls of the two first insertion tubes.

6. The quick-assembly commode chair according to claim 1, characterized in that, Each of the side frames has a second insertion hole at the top, the second insertion hole being located in front of the seat plate, and each of the footrests has a second insertion tube, with two second insertion tubes respectively inserted into two second insertion holes.

7. The quick-assembly commode chair according to claim 6, characterized in that, Each of the side frames is provided with a support seat on its front side, and each of the footrests is provided with an abutment seat. The rear side of the abutment seat is provided with an abutment groove, and the front wall of the abutment groove abuts against the front wall of the support seat.

8. The quick-assembly commode chair according to claim 7, characterized in that, The top of the abutment groove is provided with an abutment block, which abuts against the top of the support base, and the rear side of the abutment block abuts against the front side of the side frame.

9. The quick-assembly commode chair according to claim 1, characterized in that, The bottom of the seat is provided with multiple fasteners, which are respectively snapped onto the top of the two side frames.

10. The quick-assembly commode chair according to claim 1, characterized in that, Each of the side frames has two third insertion holes spaced apart at the bottom. The quick-release commode chair also includes four casters. Each caster has a third insertion tube on its top, and the four third insertion tubes are respectively inserted into the four third insertion holes.

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