KR102308822B1 - Chair for pelvic muscle exercise - Google Patents

Abstract

The present invention relates to a pelvic muscle floor exercise chair. In the present invention, a user fixes an upper body by relying on at least one of a first arm frame or a second arm frame, and a buttocks unit supported on a seat are eccentrically rotated in the horizontal direction. Therefore, muscles around a pelvis as well as organs inside an abdomen can be effectively stimulated. The pelvic muscle floor exercise chair of the present invention comprises: a frame assembly (100); a seat (200); a drive assembly (300); and a control assembly (400).

Description

Chair for pelvic muscle exercise

The present invention relates to a pelvic muscle exercise chair that rotates a user's pelvis in a horizontal direction.

In general, a chair is configured to include at least one or more poles, and a seat plate provided to sit on the top of the poles.

Office workers and patients are unable to exercise properly and have no choice but to sit on a chair for a long time. As a result, blood circulation is not performed properly, so there is a problem of stiffening of the back and pelvic muscles.

In order to relieve the stiffness of the muscles around the pelvis, chairs that allow stretching or other exercises to be performed are being developed.

Korean Patent Publication No. 10-2010-0020607 (hereinafter referred to as prior art) discloses a chair that rotates a seat cushion based on a column.

In the chair according to the prior art, since the armrest is fixed to the seat cushion, the entire body of the user is rotated when the seat cushion is rotated, thereby causing motion sickness in the user.

Korean Patent Publication No. 10-2010-0020607 Japanese Patent Application Laid-Open No. 2008-149029A

An object of the present invention is to provide a pelvic muscle exercise chair that rotates the user's pelvis in the horizontal direction.

An object of the present invention is to provide a pelvic muscle exercise chair capable of fixing the user's upper body and rotating only the lower body in which the pelvis is located.

An object of the present invention is to provide a pelvic muscle exercise chair capable of providing pelvic exercise when necessary while being used as a general chair.

The present invention is a frame assembly; a seat rotatably disposed on the frame assembly; a drive assembly connecting the frame assembly and the seat, and eccentrically rotating the seat in a horizontal direction; and a control assembly disposed on the frame assembly and configured to operate the drive assembly.

The frame assembly may include: a base frame supporting the load of the sheet; a leg assembly coupled to the base frame and extending downwardly supported on the ground; a first arm frame and a second arm frame coupled to the base frame, extending upward, and disposed on the side of the seat; and a back frame coupled to the base frame and extending upwardly disposed on the rear side of the seat.

It may further include; is disposed between the base frame and the seat, coupled to the bottom surface of the seat, the slide frame is arranged to be slidably movable in the front and rear direction with respect to the base frame.

The leg assembly may include: a first leg disposed on the front left side; a second leg disposed on the rear left; a third leg disposed on the front right; a fourth leg disposed on the rear right; a first bridge connecting lower ends of the first leg and the second leg; It may further include; a second bridge connecting the lower ends of the third leg and the fourth leg.

The sheet may include: a base sheet assembled to the slide frame and moved relative to the slide frame in a front-rear direction; It may include a; is disposed on the upper side of the base sheet, and rotates eccentrically with respect to the base sheet.

First, according to the present invention, since the user fixes the upper body by relying on at least one of the first arm frame or the second arm frame, and the hip supported on the seat rotates eccentrically in the horizontal direction, the muscles around the pelvis as well as the inside of the abdomen Organs also have the advantage of being able to receive effective stimulation.

Second, the present invention has the advantage of being able to effectively support the load of the eccentrically rotated rotating seat by disposing a friction reducing member between the base sheet and the rotating seat, and minimizing frictional resistance against eccentric rotation.

Third, the present invention has the advantage of being able to adjust the position according to the user's body shape because the seat can slide in the front and rear direction of the base frame.

Fourth, the present invention effectively supports the eccentric load or vibration generated when the lower body of the user sitting on the seat rotates eccentrically through the first leg assembly and the second leg assembly, and there is an advantage that can reduce the risk of safety accidents of the user. .

1 is a perspective view of a pelvic muscle exercise chair according to a first embodiment of the present invention.
FIG. 2 is a perspective view seen from the rear side of FIG. 1 ;
FIG. 3 is a front view of FIG. 1 ;
FIG. 4 is a right side view of FIG. 1 ;
FIG. 5 is an exploded perspective view of the drive assembly shown in FIG. 1 ;

Advantages and features of the present invention and methods of achieving them will become apparent with reference to the embodiments described below in detail in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but may be implemented in various different forms, and only these embodiments allow the disclosure of the present invention to be complete, and common knowledge in the art to which the present invention pertains It is provided to fully inform those who have the scope of the invention, and the present invention is only defined by the scope of the claims. Like reference numerals refer to like elements throughout.

1 is a perspective view of a pelvic muscle exercise chair according to a first embodiment of the present invention, FIG. 2 is a perspective view seen from the rear side of FIG. 1 , FIG. 3 is a front view of FIG. 1 , and FIG. 4 is a right side view of FIG. , and FIG. 5 is an exploded perspective view of the drive assembly shown in FIG. 1 .

The pelvic muscle exercise chair according to this embodiment connects the frame assembly 100, the seat 200 rotatably disposed on the frame assembly 100, and the frame assembly 100 and the seat 200, It includes a drive assembly 300 for rotating the seat 200 , and a control assembly 400 disposed on the frame assembly 100 and operating the drive assembly 300 .

A user may be seated on the seat 200 . The sheet 200 may be disposed in a generally horizontal direction. When viewed from a top view, the sheet 200 may be formed in a circular shape.

The seat 200 may be rotated by the drive assembly 300 . In this embodiment, the rotation of the seat 200 is an eccentric rotation. The seat 200 may be eccentrically rotated clockwise or counterclockwise regardless of the frame assembly 100 .

The sheet 200 may be eccentrically rotated in a clockwise direction for a predetermined time, and may be rotated eccentrically in a counterclockwise direction after a predetermined time. The seat 200 may reciprocate eccentrically by the drive assembly 300 .

A user may hold the frame assembly 100 or support the frame assembly 100 to fix the upper body, and the lower body may be eccentrically rotated while seated on the seat 200 .

That is, the chair for exercising the pelvic muscles according to the present embodiment has a feature that can separate the upper and lower body, fix the upper body, and rotate only the pelvis of the lower body in a clockwise or counterclockwise direction.

When the upper body is fixed and the pelvis of the lower body is rotated in the horizontal direction as in this embodiment, there is an advantage that not only the muscles around the pelvis but also the organs inside the abdomen can be effectively stimulated.

In particular, since the seat 200 is eccentrically rotated around the user's perineum, pelvic floor muscles, sphincters, etc. may be stimulated by eccentric horizontal rotation around the perineum. In addition, by the horizontal eccentric rotation of the seat 200, the internal organs of the spine and abdomen are also effectively stimulated while eccentrically rotated in the horizontal direction.

The pelvic muscle exercise chair according to this embodiment provides a structure capable of fixing or supporting the user's upper body, thereby effectively providing upper and lower body separation, and can perform eccentric reciprocating motion only around the pelvis of the target lower body in the horizontal direction. have.

The frame assembly 100 is coupled to a base frame 110, a leg assembly 120 coupled to the base frame 110, extended downward and supported on the ground, and the base frame 110, The first arm frame 130 and the second arm frame 140 extending upward and disposed on the side of the seat 200, coupled to the base frame 110, and extending upward to the seat 200 ) includes a back frame 150 disposed on the rear side, and a slide frame 160 disposed on the upper side of the base frame 110 and arranged to be slidably movable in the front and rear direction with respect to the base frame 110 . .

The base frame 110 is disposed to face the sheet 200 , is disposed below the sheet 200 , and may support a load of the sheet 200 .

In this embodiment, the base frame 110 is disposed below the slide frame 160 .

The slide frame 160 may be disposed on the upper side of the base frame 110 and fixed to the base frame 110 .

The slide frame 160 is disposed between the base frame 110 and the seat 200 , and may guide the slide movement of the seat 200 .

The slide frame 160 includes a first slide frame 161 disposed on the left side and a second slide frame 162 disposed on the right side.

The first slide frame 161 and the second slide frame 162 are spaced apart from each other in the left and right directions to form a spacing, and a rail (not shown) for sliding movement of the seat 200 is disposed between the spacing. can be

The leg assembly 120 includes a first leg 121 disposed on the front left side, a second leg 122 disposed on the rear left side, a third leg 123 disposed on the front right side, and disposed on the rear right side. a fourth leg 124, a first bridge 125 connecting the lower ends of the first leg 121 and the second leg 122, and the third leg 123 and the fourth leg 124 and a second bridge 126 connecting the lower ends of the .

The first leg 121 , the second leg 122 , the third leg 123 , and the fourth leg 124 are disposed in the vertical direction. The first bridge 125 and the second bridge 126 are arranged in a horizontal direction and supported on the ground.

The first leg 121 , the second leg 122 , and the first bridge 125 are integrally manufactured and disposed on the left side of the seat 200 . The first leg 121 , the second leg 122 , and the first bridge 125 are defined as a first leg assembly.

The third leg 123 , the fourth leg 124 , and the second bridge 126 are integrally manufactured and disposed on the right side of the seat 200 . The third leg 123 , the fourth leg 124 , and the second bridge 126 are defined as a second leg assembly.

The left and right intervals of the first bridge 125 and the second bridge 126 are formed to be longer than the left and right widths of the sheet 200 . The front and rear lengths of the first bridge 125 and the second bridge 126 are longer than the front and rear widths of the sheet 200 .

Since the seat 200 is eccentrically rotated while the user sits on the seat 200 , the first bridge 125 and the second bridge 126 are disposed outside the seat 200 to ensure the user's seating stability. to improve

Since the seat 200 is eccentrically rotated while the user sits on the seat 200 , the user's center of gravity is the first leg 121 , the second leg 122 , the fourth leg 124 and the third The cycle may be clockwise along the leg 123 or counterclockwise along the third leg 123 , the second leg 122 , the first leg 121 and the fourth leg 124 .

The entire lower surface of the first bridge 125 and the second bridge 126 is in close contact with the floor, thereby effectively distributing the user's center of gravity moving in the clockwise or counterclockwise direction.

When the user's upper body is supported or fixed to the frame assembly 100, and the user's lower body is eccentrically rotated, the leg assembly 120 supports it and the user's fall can prevent

The leg assembly 120 may be coupled to at least one of the base frame 110 and the slide frame 160 . In this embodiment, the leg assembly 120 is coupled to the base frame 110 and the slide frame 160 at the same time.

In this embodiment, the first leg 121 , the second leg 122 , the third leg 123 and the fourth leg 124 are respectively disposed on the upper end of the leg coupling portion 128 , and each leg coupling The part 128 is simultaneously coupled to the base frame 110 and the slide frame 160 .

The first arm frame 130 and the second arm frame 140 may be coupled to the base frame 110 . The first arm frame 130 and the second arm frame 140 may be coupled to the slide frame 140 .

In this embodiment, the first arm frame 130 and the second arm frame 140 are coupled to the slide frame 140 . Specifically, the first arm frame 130 is coupled to the first slide frame 161 , and the second arm frame 140 is coupled to the second slide frame 162 .

The first arm frame 130 and the second arm frame 140 are symmetrical with respect to the front and rear directions, and have the same structure.

The first arm frame 130 is coupled to the first slide frame 161, a first arm 132 extending to the left, and connected to the first arm 132, the first arm 132 ) and a second arm 134 formed to extend upwardly, and an armrest 136 disposed on the upper end of the second arm 134 .

The second arm frame 140 is coupled to the second slide frame 162 , a first arm 142 extending to the right, and connected to the first arm 142 , the first arm 142 . ) and a second arm 144 formed to extend upwardly, and an armrest 146 disposed on the upper end of the second arm 144 .

The first arm 142 is disposed below the seat 200 . The first arm 142 may be disposed between the third leg 123 and the fourth leg 124 .

The second arm 144 is formed to extend upwardly from the outer end of the first arm 142 . The upper end of the second arm 144 is disposed higher than the seat 200 .

The armrest 146 is disposed on the upper end of the second arm 144 .

The second arm 144 may be composed of a plurality of pieces capable of sliding movement so as to extend the length in the vertical direction. The height of the armrest 146 may be adjusted by adjusting the length of the second arm.

The control assembly 400 may be disposed on any one of the armrests 146 of the first arm frame 130 or the second arm frame 140 . In this embodiment, the control assembly 400 is disposed on the first arm frame 130 .

The first arm frame 130 or the second arm frame 140 are spaced apart from each other left and right so as not to interfere with the eccentric rotation of the seat 200 . placed within the width.

Since the seat 200 is rotated eccentrically, the load on one side of the user may be further increased to be concentrated on either the first arm frame 130 or the second arm frame 140 .

When the first arm frame 130 or the second arm frame 140 is out of the first bridge 125 or the second bridge 126, the user's expectation may be overturned to the left or right by the load. .

The back frame 150 includes a backbone 151 , 152 coupled to at least one of the base frame 110 and the slide frame 160 , and a back cushion 154 coupled to the backbone 151 , 152 . includes

The backbones 151 and 152 include two left and right frames, and are coupled to the rear end of the slide frame 160 and extend upward in this embodiment.

The backbone includes a first backbone 151 coupled to the rear end of the first slide frame 161 and extending upward, and a second backbone 152 coupled to the rear end of the second slide frame 162 and extending upwardly. ) is included.

The first backbone 151 and the second backbone 152 may further include a connect backbone 153 arranged to be spaced apart in the left and right directions, and connecting the first backbone 151 and the second backbone 152 to each other. have.

The first backbone 151 and the second backbone 152 are disposed within the left and right widths of the seat 200 . The interval between the first backbone 151 and the second backbone 152 may be the same as the left and right intervals between the first slide frame 161 and the second slide frame 162 .

The seat 200 is disposed between the first arm frame 130 , the second arm frame 140 and the back frame 150 , the first arm frame 130 , the second arm frame 140 , and It may be eccentrically rotated between the back frames 150 .

When viewed from the top view, the seat 200 may be rotated while forming a predetermined circular orbit between the first arm frame 130 , the second arm frame 140 , and the back frame 150 .

The seat 200 is assembled to the slide frame 160, the base sheet 210 is relatively moved in the front-rear direction with respect to the slide frame 160, is disposed above the base sheet 210, the base The rotation sheet 220 eccentrically rotated with respect to the seat 210, and the base sheet 210 and the rotation seat 220 are disposed on at least one of, and reduce the frictional force during eccentric rotation of the rotation sheet 220 It further includes a friction reducing member (230).

The base sheet 210 is disposed on the upper side of the slide frame 160, and may be slidably moved in the front-rear direction. The base sheet 210 may be made of a solid material.

When viewed from a top view, the base sheet 210 may be formed in a rectangular shape.

The base sheet 210 is disposed on the upper side of the first slide frame 161 and the second slide frame 162, and may be moved in the front-rear direction.

A locking structure for limiting the forward and backward movement of the base sheet 210 may be further disposed. A detent assembly (not shown, detent assembly) is disposed between the slide frames 161 and 162 and the base sheet 210, and the slide frames 161 and 162 and the base through the ball of the detent assembly. Interlocking of the sheets 210 may be formed.

The base sheet 210 may further include a rail 212 moving along the first slide frame 161 and the second slide frame 162 , and the rail 212 includes the first slide frame 161 . ) and the second slide frame 162 is disposed between.

The rotating sheet 220 may be assembled to the base sheet 210 through a seat shaft 221 , and may be eccentrically rotated with respect to the base sheet 210 .

An imaginary axis penetrating the seat axis 221 in the vertical direction is defined as a seat rotation center D.

The rotation sheet 220 and the base sheet 210 may be disposed to face each other.

The friction reducing member 230 may be disposed on the base sheet 210 and support the rotation sheet 220 . The friction reducing member 230 may be a bearing.

The friction reducing member 230 may protrude upward from the upper surface of the base sheet 210 to form a rolling resistance with the rotation sheet 220 .

When viewed from a top view, the rotating sheet 220 may be formed in a circular shape.

The base sheet 210 may further include a support portion 215 corresponding to the plane of the rotation sheet 220 , and the friction reducing member 230 may be disposed on the support portion 215 .

A plurality of the friction reducing members 230 may be radially disposed based on the geometric center of the base sheet 210 . When the friction reducing member 230 is disposed on the rotating seat 220, it may be pushed out of the base sheet 210 during the eccentric rotation process, and in this case, it may cause jamming with the base sheet 210 to cause malfunction or failure. this can be

When viewed from the top view, the geometric center of the rotating seat 220 and the seat axis 221 are displaced. The geometric center of the rotation sheet 220 may be the center of a circle.

A geometric center of the rotating sheet 220 is defined as a sheet plane center (C).

The sheet plane center (C) may be disposed in front or behind the seat rotation center (D), and in this embodiment, the sheet rotation center (D) is disposed in front of the sheet plane center (C).

Since a plurality of friction reducing members 230 are disposed on the radially outer side of the seat rotation center (D), even if the user's load is biased outside the seat rotation center (D), the rotation sheet 220 can be firmly supported. can

The seat shaft 221 is disposed to be spaced apart from the center of the circle in a radial direction outward. As the distance between the center of the circle and the seat shaft 221 increases, the eccentric radius of the seat 220 increases.

The drive assembly 300 includes a drive motor 310 , a drive pulley 320 rotated by the drive motor 310 , and a driven pulley 330 rotated by receiving the rotational force of the drive pulley 320 . and a belt 340 connecting the driving pulley 320 and the driven pulley 330 , and a seat shaft 221 connecting the driven pulley 330 and the rotating seat 220 .

In this embodiment, the drive assembly 300 transmits the rotational force to the seat 200 through the belt-pulley structure. Unlike the present embodiment, it is ok to transmit the rotational force to the seat 200 through a combination of gear-links.

The driving motor 310 is disposed on the base frame 110 . In the driving motor 310 , a motor shaft of the driving motor 310 is coupled to the driving pulley 320 , and rotates the driving pulley 320 .

The driving motor 310 is disposed to protrude downward from the base frame 110 . Since the driving motor 310 is disposed to protrude below the base frame 110 , the center of gravity of the chair can be formed further below.

The driving motor 310 is disposed on the rear side of the seat plane center (C).

The driven pulley 330 has a larger diameter than the driving pulley 320 , and is disposed on the same plane as the driving pulley 320 .

The seat shaft 221 passes through the base sheet 210 to couple the driven pulley 330 and the rotating seat 220 . A shaft hole 211 penetrating the base sheet 210 in the vertical direction is disposed, and the seat shaft 221 is disposed to penetrate the shaft hole 211 .

The seat rotation center D is formed on the seat shaft 221 .

Since the plurality of friction reducing members 230 support the edge of the rotating seat 220 , the load concentrated on the seat shaft 221 can be reduced.

The seat shaft 221 may be screwed to each of the driven pulley 330 and the rotating seat 220 .

A coupling portion 331 to which the seat shaft 221 is coupled is formed in the driven pulley 330 .

On the other hand, a heating wire is disposed on the rotating seat 220 of the seat 200, and the heating wire is operated to provide heat to the user's buttocks, thereby maximizing the exercise effect.

In addition, by further disposing a magnetic force generating member of a strong magnetic force near the seat rotation center (D) of the rotating seat 220, the user's perineum portion can be stimulated through magnetic force.

Meanwhile, although not shown, it may further include a fixing belt disposed on at least one of the first arm frame 130 , the second arm frame 140 , and the back frame 150 , and fixing the upper body of the user. have. The fixing belt is preferably disposed on the back frame 150 to bring the user's upper body into close contact with the back cushion 154 .

When the user's upper body is fixed through the fixing belt, the upper and lower body separation occurs more reliably, and the exercise effect of the user's muscles and organs around the pelvis can be further maximized.

Those of ordinary skill in the art to which the present invention pertains will understand that the present invention may be embodied in other specific forms without changing the technical spirit or essential features thereof. Therefore, it should be understood that the embodiments described above are illustrative in all respects and not restrictive. The scope of the present invention is indicated by the claims described below rather than the above detailed description, and all changes or modifications derived from the meaning and scope of the claims and their equivalent concepts are included in the scope of the present invention. should be interpreted

100: frame assembly 110: base frame
120: leg assembly 130: first arm frame
140: second arm frame 150: back frame
160: slide frame 200: sheet
210: base sheet 220: rotating seat
230: friction reducing member 300: drive assembly
310: drive motor 320: drive pulley
330: driven pulley 340: belt
400: control assembly

Claims (5)

frame assembly 100;
a seat 200 rotatably disposed on the frame assembly 100;
a drive assembly 300 connecting the frame assembly and the seat, and eccentrically rotating the seat in a horizontal direction;
and a control assembly 400 disposed on the frame assembly 100 and operating the drive assembly 300;
The frame assembly 100,
base frame 110; a leg assembly 120 coupled to the base frame 110 and extending downward to be supported on the ground; a first arm frame 130 and a second arm frame 140 coupled to the base frame 110, extending upward, and disposed on the side of the seat 200; a back frame 150 extending upward and disposed on the rear side of the seat 200; and a slide frame 160 disposed on the upper side of the base frame 110, assembled to be movable relative to the seat 200, and slidably disposed in the front-rear direction with respect to the base frame 110; and ,
The leg assembly 120,
a first leg 121 disposed on the front left; a second leg 122 disposed on the rear left; a third leg 123 disposed on the front right; a fourth leg 124 disposed on the rear right; a first bridge 125 connecting lower ends of the first leg 121 and the second leg 122; a second bridge 126 connecting lower ends of the third leg 123 and the fourth leg 124; a left leg coupling portion 138 to which upper ends of the first leg 121 and the second leg 122 are coupled; and a right leg coupling portion 128 to which the upper ends of the third leg 123 and the fourth leg 124 are coupled.
The first arm frame 130,
a first arm 132 coupled to the slide frame 160 and extending to the left; a second arm (134) connected to the first arm (132) and extending upwardly from the first arm (132); an armrest (136) disposed on the upper end of the second arm (134);
The second arm frame 140,
a first arm 142 coupled to the slide frame 160 and extending to the right; a second arm (144) connected to the first arm (142) and extending upwardly from the first arm (142); an armrest (146) disposed on the upper end of the second arm (144);
The backbone 150 is
a first backbone 151 coupled to the rear end of the slide frame 160 and extending upwardly; a second backbone 152 coupled to the rear end of the slide frame 160, spaced apart from the first backbone 151 in the left and right directions, and extending upwardly; a connect backbone 153 connecting the first backbone 151 and the second backbone 152; and a back cushion 154 coupled to the first backbone 151 and the second backbone 152;
The slide frame 160 is
a first slide frame 161 disposed on the left side, disposed between the base frame 110 and the base sheet 210, to which the first arm frame 130 is coupled;
It is disposed on the right side, is spaced apart from the first slide frame 161 in the left and right directions, is disposed between the base frame 110 and the base sheet 210, and the second arm frame 140 is coupled. a second slide frame 162;
a rail disposed between the first slide frame 161 and the second slide frame 162 and sliding the seat 200;
The sheet 200 is
a base sheet 210 assembled on the upper side of the first slide frame 161 and the second slide frame 162 and relatively moved in the front-rear direction along the rail; a rotation sheet 220 disposed on the base sheet 210 and eccentrically rotated with respect to the base sheet 210; A friction reducing member 230 disposed on at least one of the base sheet 210 and the rotating seat 220, and reducing the frictional force during eccentric rotation of the rotating seat 220;
The first backbone 151 is coupled to the rear end of the first slide frame 161, and the second backbone 152 is coupled to the rear end of the second slide frame 162,
The first arm 132 of the first arm frame 130 is coupled to the left side of the first slide frame 161 , and the first arm 142 of the second arm frame 140 is connected to the second coupled to the right side of the slide frame 162,
The upper ends of the first leg 121 and the second leg 122 are coupled to the left side of the left leg coupling part 138, and the base frame 110 and the right side of the left leg coupling part 138 are coupled to each other. The left side of the first slide frame is combined,
The upper ends of the third leg 123 and the fourth leg 124 are coupled to the right side of the right leg coupling part 128, and the base frame 110 and the left side of the right leg coupling part 128 are coupled to each other. The right side of the first slide frame is combined,
A plurality of the friction reducing members 230 are disposed, and the plurality of friction reducing members 230 protrude upward from the upper surface of the base sheet 210 to form rolling resistance with the rotating sheet 220, A plurality of the friction reducing members 230 are radially disposed with respect to the center of the sheet plane (C) of the rotating seat 220,
Further comprising a detent assembly disposed between the first slide frame 161 and the base sheet 210 and between the second slide frame 162 and the base sheet 210,
When the sheet 200 is moved in the front-rear direction, the first slide frame 161 and the base sheet 210 are interlocked with each other through the ball of the detent assembly, and the second slide frame 162 . And a pelvic muscle exercise chair to form a mutual engagement of the base sheet (210).
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