JPH0611544U - Chair - Google Patents

Abstract

(57) [Summary] [Purpose] The backrest can be horizontally moved relative to the seat in the front-rear direction so that the substantial depth from the front end of the seat to the backrest can be easily adjusted, and the height of the seat is increased. The height of the chair can be adjusted, the safety of the chair after adjustment is improved without relying solely on the fixing of fixing bolts, and the posture of the person sitting on the chair, such as a child, is kept normal. [Structure] Between a pair of L-shaped support frames 1 composed of a bottom frame 2 and a vertical frame 3, a seat part 4 having legs 4a formed at left and right front ends is arranged, and between the upper parts of the left and right vertical frames 3. A backrest portion 5 is formed on the upper portion, a seat portion supporting surface 3a is formed on the inner side surface of each vertical frame 3, and height adjusting plates 6 and 7 are attached to the lower surface of the bottom frame 2 and fixed to these connecting portions. A hole and a screw hole are provided, and a fixing bolt a is inserted and screwed into the fixing hole and the screw hole so that the seat portion 4 can be horizontally moved and adjusted with respect to the backrest portion 5, and the seat portion 4 can be adjusted in the height direction. It has an adjustable structure.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 In this invention, the seat portion can be horizontally moved in the front-rear direction with respect to the backrest portion, the substantial depth from the front end of the seat portion to the backrest portion can be easily adjusted, and the height of the chair can be adjusted. The present invention relates to a chair that keeps the posture of a person sitting on the chair, such as a child, normal.

[0002]

[Prior art]

 The height of the table used at home is made for adults, and there are some study desks with a lower height for school children, but there are few types, and the table and study desk are long-term. Because it is used, chairs are available on the market that can be adjusted in height so that young children can use it comfortably for many years as they grow up.

However, in the conventional chair whose height is adjustable, the height of only the seat portion or the height of the seat portion and the backrest portion is adjusted in the vertical direction, and the substantial depth of the seat portion is increased. Was constant.

Therefore, when a younger child sits down on such a chair, the distance between the front and rear of the seat portion is long for the child, so that the child cannot lean on the backrest in a normal posture. In addition, the child's posture deteriorates and the child's posture deteriorates, and as this is repeated many times, a bad posture becomes a habit. There is a problem that a bad posture is formed such as curling.

As a chair capable of solving such a problem, a "child's chair" (back of a child's chair) in which a backrest portion is horizontally moved in a front-rear direction so that a substantial depth of a seat portion can be adjusted. 48213) has been devised.

[0006]

[Problems to be Solved by the Invention] The above-mentioned "Children's Chair" (Shoko 63-48213) is constructed so that the seat portion and the backrest portion can be adjusted at the same time. When adjusting and fixing, since it relies on fixing the locking bolts inserted laterally from the side of the chair, if the locking bolts come loose or come off due to long-term use, or if they are broken under load, The seat may fall downward. In particular, if the stop bolt comes off or breaks when a child or the like is seated, the seated child or the like may be injured, which is a safety issue.

The present invention has been made in view of the above problems to solve the problems. The purpose of the invention is to move the backrest part horizontally with respect to the seat part in the front-back direction. You can freely adjust the substantial depth from the front end of the seat part to the backrest part, and you can adjust the height of the seat part, and you can adjust the height of the seat part without changing only the fixing bolts. It is to provide a chair that enhances safety and can maintain the normal posture of a person who sits in the chair, such as a child.

[0008]

[Means for Solving the Problems]

 In order to solve the above problems, the invention of claim 1 forms an L-shaped support frame 1 from a bottom frame 2 and a vertical frame 3 extending upward from the rear end of the bottom frame 2, and a pair of left and right frames is provided. Between the L-shaped support frames 1, the seat portions 4 each having legs 4a formed at the left and right ends of the front are arranged, and the backrest portion 5 is provided between the upper portions of the vertical frames 3 of the pair of left and right L-shaped support frames 1. A seat supporting surface 3a is formed on the inner side surface of each vertical frame 3 below the backrest 5 so as to project, and is stacked in the height direction on the lower surface of the bottom frame 2 of each L-shaped supporting frame 1. A plurality of height adjusting plates 6 and 7 are attached, a plurality of seat fixing holes 2a are formed in the lateral direction of the bottom frame 2 of each L-shaped support frame 1 in the left-right direction, and the vertical direction of each L-shaped support frame 1 is formed. A seat fixing hole 3b is formed in the left and right direction slightly above the seat supporting surface 3a on the side surface of the frame 3, and the left side is formed on the lower side surface of each leg 4a of the seat portion 4. A screw hole 4b is formed in the direction, a plurality of screw holes 4c are formed in the left and right sides of the rear portion of the seat portion 4 in the left-right direction, and the screw hole 4b is formed downward on the upper surface of the bottom frame 2 of each L-shaped support frame 1. A plurality of height fixing holes 2b are formed toward the bottom surface of the bottom frame 2 of the L-shaped support frame 1, and the height adjusting plate 6 is stacked in the height direction. A communicating hole 6a is formed at the corresponding position, and a screw hole 7a is formed in the lowermost height adjusting plate 7, and a fixing bolt a is inserted into each fixing hole, and its tip side is screwed into each screw hole. In addition, the seat portion 4 is configured to be horizontally movable in the front-rear direction with respect to the backrest portion 5, and the seat portion 4 is adjustable in the height direction.

Further, in the invention of claim 2, the L-shaped support frame 1 is constituted by the bottom frame 2 and the vertical frame 3 extending from the rear end of the bottom frame 2 to the upper part, and a pair of left and right L-shaped frames is formed. A seat portion 4 having legs 4a formed at the front left and right ends is arranged between the support frames 1, and a backrest portion 5 is formed between the upper portions of the vertical frames 3 of the pair of left and right L-shaped support frames 1, A seat supporting surface 3a is formed to project on the inner side surface of each vertical frame 3 below the backrest 5, and a plurality of heights are stacked on the lower surface of the bottom frame 2 of each L-shaped supporting frame 1 in the height direction. The bottom surface of the bottom frame 2 of the L-shaped support frame 1 has a plurality of height fixing holes 2b formed downward on the top surface of the bottom frame 2 of each L-shaped support frame 1. The height adjusting plate 6 stacked in the height direction is formed with the communication hole 6a at a position corresponding to the hole position of the height fixing hole 2b, and the height adjusting plate 7 of the lowermost stage is formed. Form a screw hole 7a, a fixing bolt a is inserted into each fixing hole, and the tip end side is screwed into each screw hole, and a dovetail groove fitting projection 3c is formed on the seat supporting surface 3a. Dovetail grooves 4e that fit with the groove fitting projections 3c are formed on the left and right sides of the rear bottom surface of the seat portion 4, respectively. Dovetail groove fitting projections 2d are formed on the upper side surfaces, and dovetail grooves 4d that fit with the dovetail groove fitting projections 2d are formed on the lower surfaces of the left and right legs 4a of the seat portion 4, respectively. A male screw 8 is arranged with its axis oriented in the front-rear direction, and the male screw 8 is rotatably held by a holding frame 9 supported between the left and right vertical frames 3 and is a forward / backward screw screwed with the male screw 8. A hole 11 is formed on the lower surface of the seat portion 4 to project, a manual handle 10 is attached to the rear end of the male screw 8, and a forward / backward female screw hole is screwed with the male screw 8. Universal horizontal movement adjusted in the longitudinal direction using a screw motion seat portion 4 with respect to the backrest portion 5, as well as shall such than configuration in which freely height direction adjusting a seat portion 4.

Further, in the invention of claim 3, the L-shaped support frame 1 is composed of the bottom frame 2 and the vertical frame 3 extending from the rear end of the bottom frame 2 to the upper part, and a pair of left and right L-shaped frames is formed. A seat portion 4 having legs 4a formed at the front left and right ends is disposed between the support frames 1, and a backrest portion 5 is formed between the upper portions of the vertical frames 3 of the pair of left and right L-shaped support frames 4, A seat supporting surface 3a is formed to project on the inner side surface of each vertical frame 3 below the backrest 5, and a plurality of heights are stacked on the lower surface of the bottom frame 2 of each L-shaped supporting frame 1 in the height direction. The bottom surface of the bottom frame 2 of the L-shaped support frame 1 has a plurality of height fixing holes 2b formed downward on the top surface of the bottom frame 2 of each L-shaped support frame 1. The height adjusting plate 6 stacked in the height direction is formed with the communication hole 6a at a position corresponding to the hole position of the height fixing hole 2b, and the height adjusting plate 7 of the lowermost stage is formed. Form a screw hole 7a, a fixing bolt a is inserted into each fixing hole, and the tip end side is screwed into each screw hole, and a dovetail groove fitting projection 3c is formed on the seat supporting surface 3a. Dovetail grooves 4e that fit with the groove fitting projections 3c are formed on the left and right sides of the rear bottom surface of the seat portion 4, respectively. Dovetail groove fitting projections 2d are formed on the upper side surfaces, and dovetail grooves 4d that fit with the dovetail groove fitting projections 2d are formed on the lower surfaces of the left and right legs 4a of the seat portion 4, respectively. A male screw 8 is arranged with its axis oriented in the front-rear direction, and the male screw 8 is rotatably held by a holding frame 9 supported between the left and right vertical frames 3 and is a forward / backward screw screwed with the male screw 8. A hole 11 is formed so as to project from the lower surface of the seat portion 4, and a male screw 8 is interlockingly connected to a motor 12 so as to be screwed with the male screw 8. Universal horizontal movement adjusted in the longitudinal direction relative to the backrest portion 5 a seat portion 4 by using the child motion, and which has the constitution that freely height direction adjusting a seat portion 4.

[0011]

[Action]

 The invention of claim 1 having the above-described structure operates as follows. In order to horizontally move the seat portion 4 in the front-rear direction with respect to the backrest portion 5, when the fixing bolt a fixing the seat portion 4 to the L-shaped support frame 1 is loosened and removed, the L-shaped support frame 1 The fixed state of the seat portion 4 that has been fixed to is released, and the seat portion 4 can be freely moved in the front-rear direction with respect to the L-shaped support frame 1. Then, after the seat portion 4 is moved back and forth by a desired length, a fixing bolt a is attached at a predetermined position to fix the seat portion 4 to the L-shaped support frame 1.

Further, the inventions of claims 2 and 3 operate as follows. In order to horizontally move the seat portion 4 in the front-rear direction with respect to the backrest portion 5, the male screw 8 which is arranged so that its axis is oriented in the front-rear direction and is rotatably held is rotated in a certain direction. The advancing / retreating screw hole 11 that is screwed with is screwed to move forward or backward along the male screw 8. The seat portion 4 in which the moving forward / backward screw hole 11 is fixed is moved integrally with the forward / backward screw hole 11 in the same direction, and the seat portion 4 is adjusted and moved forward and backward with respect to the backrest portion 5. be able to.

Further, the inventions of claims 1, 2 and 3 operate as follows. To adjust the height, loosen and remove the stop bolt a fixing the height adjusting plates 6 and 7 to the lower surface side of the bottom frame 2 of the L-shaped support frame 1. The height adjustment plates 6 and 7 that have been fixed to the bottom surface of the bottom frame 2 are released from the fixed state, and the height adjustment plates 6 with different plate thicknesses can be attached, or the height adjustment plates 6 can be newly installed. By adding the seat portion 4, the seat portion 4 can be freely adjusted in the height direction with respect to the floor surface. Then, after the seat portion 4 is vertically adjusted by a desired height, the fixing bolt a is attached at a predetermined position to fix the height adjusting plates 6 and 7 on the lower surface side of the bottom frame 2.

[0014]

【Example】

 Hereinafter, the present invention will be described more specifically on the basis of the embodiments shown in the drawings.

First Embodiment Here, FIG. 1 is a side view of a chair, FIG. 2 is a front view of the chair, FIG. 3 is a rear view of the chair, and FIG. 4 is a plan view of the chair.

In the figure, an L-shaped support frame 1 is composed of a bottom frame 2 and a vertical frame 3 extending upward from the rear end of the bottom frame 2. Two L-shaped support frames 1 are used and consist of a pair of left and right (two). The pair of left and right L-shaped support frames 1 are spaced apart from each other and arranged side by side, and the seat portion 4 is disposed therebetween.

The seat portion 4 is formed with legs 4a, 4a vertically extending downward at both left and right ends of a front portion thereof. One lower screw hole 4b is formed on the side surface of each leg 4a in the left-right direction. A plurality of upper screw holes 4c (seven in this embodiment) are formed in the left and right side surfaces of the rear portion of the seat portion 4 in the left-right direction.

Further, a backrest 5 is formed between the upper portions of the vertical frames 3 of the pair of left and right L-shaped support frames 1. The backrest portion 5 is formed of a thick plate material horizontally provided between the left and right vertical frames 3. The L-shaped support frame 1 holds a seat portion 4 and a backrest portion 5 to form a chair.

On the left and right vertical frames 3, seat supporting surfaces 3 a each having a flat surface are formed so as to protrude below the backrest 5 and on inner side surfaces facing each other. The left and right ends of the rear lower surface of the seat 4 are placed and supported on the surface of the seat supporting surface 3a, so that the seat 4 immediately drops even if the locking bolt a described later is removed or broken. In fact, safety is improved.

On the lower surface of the bottom frame 2 of each L-shaped support frame 1, a plurality of (two in this embodiment) height adjusting plates 6 and 7 stacked in the height direction are mounted. By mounting these height adjusting plates 6 and 7, the height of the chair can be adjusted and increased. Although these height adjusting plates 6 and 7 are fixed to the bottom frame 2 with fastening bolts as described later, since the height adjusting plates 6 and 7 are in a laminated state, even if the fastening bolts come off, the seat portion 4 is immediately removed. Is not lowered, and safety is improved.

On the side surface of each bottom frame 2 of the L-shaped support frame 1, a plurality of (seven in this embodiment) lower seat fixing holes 2a, 2a ... Penetrating in the left-right direction are formed. . Each of the lower seat fixing holes 2a, 2a ... Is formed so that the height position thereof corresponds to the lower screw hole 4b formed in the lower side surface of the leg 4a of the seat portion 4 in the left-right direction. ing. Further, a plurality of (two in this embodiment) height fixing holes 2b, 2b penetrating downward are formed on the upper surface of each bottom frame 2 of the L-shaped support frame 1.

On the side surface of each vertical frame 3 of the L-shaped support frame 1 and slightly above the seat support surface 3a, one upper seat fixing hole 3b penetrating in the left-right direction is formed. Has been done. The upper seat fixing holes 3b are formed so that their height positions correspond to the upper screw holes 4c formed on the left and right side surfaces of the rear portion of the seat portion 4, respectively.

On the upper surface of the height adjusting plate 6 laminated on the lower surface of each bottom frame 2 of the L-shaped support frame 1, the lower part is formed at a position corresponding to the hole positions of the above height fixing holes 2b, 2b. A communication hole 6a is formed so as to penetrate toward. Further, height adjusting screw holes 7a are formed on the upper surface of the height adjusting plate 7 located at the lowermost stage at positions corresponding to the hole positions of the height fixing holes 2b and the communicating holes 6a.

The fixing bolts a are inserted into the lower seat fixing holes 2a, the height fixing holes 2b, the upper seat fixing holes 3b, and the communication holes 6a, and the tip side of each of the inserted fixing bolts a is The lower screw holes 4b, the upper screw holes 4c of the seat 4 and the height adjusting screw holes 7a of the lowermost height adjusting plate 7 are screwed together to fix the members to each other.

Next, the operation based on the configuration of the first embodiment will be described below. In order to horizontally move the seat portion 4 in the front-back direction with respect to the backrest portion 5, first, the stop bolt a fixing the seat portion 4 to the L-shaped support frame 1 is loosened and removed.

To remove the fixing bolt a, the fixing bolt a is rotated and loosened, and then pulled out from the lower seat fixing hole 2a and the upper seat fixing hole 3b, respectively. By this pulling out, the seat portion 4 fixed to the L-shaped supporting frame 1 is released from the fixed state, and the seat portion 4 can be freely moved in the front-back direction with respect to the L-shaped supporting frame 1. Will be able to.

Then, after moving the seat portion 4 back and forth by a desired length, the set bolt a is inserted into the lower seat fixing hole 2a and the upper seat fixing hole 3b, and the tip side of the set bolt a is seated in the seat portion 4. The seat portion 4 is fixed to the L-shaped support frame 1 by being screwed into the lower screw hole 4b and the upper screw hole 4c.

Further, in order to adjust the height, first, the set bolt a fixing the height adjusting plates 6 and 7 to the lower surface side of the bottom frame 2 of the L-shaped support frame 1 is loosened and removed.

In order to remove the stop bolt a, the stop bolt a is rotated and loosened, and then pulled out from the height fixing holes 2b. By this pulling out, the fixed state of the height adjusting plates 6 and 7 fixed to the lower surface side of the bottom frame 2 of the L-shaped support frame 1 is released. After releasing, by installing the height adjustment plate 6 with different plate thickness or adding a new height adjustment plate 6, the seat part 4 can be freely adjusted in the height direction with respect to the floor surface. I will be able to let you.

After the seat portion 4 is vertically adjusted by a desired height, the fixing bolt a is inserted into the height fixing hole 2b of the bottom frame 2 and the communication hole 6a of the height adjusting plate 6, and the fixing bolt a is inserted. The tip end side of a is screwed into the height adjusting screw hole 7a of the height adjusting plate 7 in the lowermost stage, and the height adjusting plates 6 and 7 are fixed to the lower surface side of the bottom frame 2.

[Second Embodiment] Here, FIG. 5 is a side sectional view of the chair, FIG. 6 is a view taken along the line AA of FIG. 5, FIG. 7 is a front view of the chair, and FIG. 8 is a rear view of the chair. Is.

In the figure, the L-shaped support frame 1 is composed of a bottom frame 2 and a vertical frame 3 extending upward from the rear end of the bottom frame 2. Two L-shaped support frames 1 are used and consist of a pair of left and right (two). The pair of left and right L-shaped support frames 1 are spaced apart from each other and arranged side by side, and the seat portion 4 is disposed therebetween.

The seat portion 4 is formed with legs 4a, 4a extending vertically downward at the left and right ends of the front portion thereof. Lower dovetail grooves 4d are formed on the lower surface of each leg 4a in the front-rear direction. Upper dovetail grooves 4e are formed in the front-rear direction at the center of the left and right sides of the rear lower surface of the seat portion 4 that contact the seat portion support surface 3a.

A backrest portion 5 is formed between the upper portions of the vertical frames 3 of the pair of left and right L-shaped support frames 1. The backrest portion 5 is formed of a thick plate material horizontally provided between the left and right vertical frames 3. The L-shaped support frame 1 holds a seat portion 4 and a backrest portion 5 to form a chair.

On the left and right vertical frames 3, below the backrest portion 5, seat portion supporting surfaces 3a each having a flat surface are formed so as to project on inner side surfaces facing each other. An upper dovetail groove fitting projection 3c that fits into the upper dovetail groove 4e is formed in the front-rear direction at the center of the upper surface of each seat portion supporting surface 3a made of a flat surface. Since the left and right ends of the rear lower surface of the seat portion 4 are fitted and supported on the seat portion support surface 3a, the seat portion 4 does not drop and the safety is improved.

On the inner side surfaces of the bottom frame 2 of each L-shaped support frame 1 that face each other, protruding bottom pieces 2 c are formed so as to protrude from the lower portions thereof. A lower dovetail groove fitting projection 2d that fits in a lower dovetail groove 4d formed on the lower surface of the leg 4a of the seat portion 4 is formed in the front and rear direction on the front side upper surface of each of the overhanging bottom pieces 2c. ing.

A plurality of (two in this embodiment) height adjusting plates 6 and 7 stacked in the height direction are mounted on the lower surface side of each bottom frame 2. By mounting these height adjusting plates 6 and 7, the height of the chair can be adjusted to be higher. These height adjusting plates 6 and 7 are fixed to the bottom frame 2 with fastening bolts as will be described later, but since the height adjusting plates 6 and 7 are in a laminated state, even if the fastening bolts come off, the seat portion 4 is immediately removed. It does not fall and the safety is improved. On the upper surface of each bottom frame 2 of the L-shaped support frame 1, a plurality of (two in this embodiment) height fixing holes 2b, 2b penetrating downward are formed.

On the upper surface of the height adjusting plate 6 laminated on the lower surface side of each bottom frame 2 of the L-shaped support frame 1, the lower part is provided at a position corresponding to the hole position of the height fixing holes 2b, 2b. A communication hole 6a is formed so as to penetrate toward. Further, height adjusting screw holes 7a are formed on the upper surface of the lowermost height adjusting plate 7 at positions corresponding to the hole positions of the height fixing hole 2b and the communicating hole 6a.

The male screw 8 is arranged on the center side below the seat portion 4 with its axis facing forward and backward. A rear end of the male screw 8 is rotatably supported by a holding frame 9 which is laterally provided and supported between the left and right vertical frames 3. A manual handle 10 is attached to the rear end of the male screw 8, and when the manual handle 10 is turned, the male screw 8 also rotates.

An advancing / retreating screw hole 11 screwed with the male screw 8 is formed so as to project downward from the lower surface of the seat portion 4. The advancing / retreating screw hole 11 has a structure in which the male screw 8 is screwed to move in the front-rear direction. Since the advancing / retreating screw hole 11 is integrally formed on the lower surface of the seat portion 4, the seat portion 4 moves in the front-rear direction together with the advancing / retreating screw hole 11.

Next, the operation based on the configuration of the second embodiment will be described below. To move the seat portion 4 horizontally in the front-rear direction with respect to the backrest portion 5, the manual handle 10 is rotated in a predetermined direction, for example, clockwise.

When the manual handle 10 is rotated in a predetermined direction, the male screw 8 is integrally rotated in the same direction in conjunction with this rotation. An advancing / retreating screw hole 11 is screwed into the rotating male screw 8. The rotating male screw 8 is only rotatably held at the rear end side by the holding frame 9, and its movement in the front-rear direction is restricted.

For this reason, when the male screw 8 rotates, the advancing / retreating screw hole 11 screwed with the male screw 8 moves by screwing on the male screw 8. Since the moving forward / backward screw hole 11 is fixedly provided on the lower surface of the seat portion 4, when the forward / backward screw hole 11 moves, the seat portion 4 integrally moves horizontally in the same direction, for example, forward.

When it is desired to stop the forward horizontal movement of the seat portion 4, the turning of the manual handle 10 is stopped. Further, when it is desired to horizontally move the seat portion 4 rearward, if the manual handle 10 is rotated in the opposite direction, for example, counterclockwise, the backrest portion 2 horizontally moves rearward through an operation reverse to the above. .

The method of adjusting the height is the same as that of the first embodiment, so the description thereof will be omitted.

[Third Embodiment] FIG. 9 is a side sectional view of a chair.

The third embodiment is different from the second embodiment in that the motor 12 is attached to the rear end of the male screw 8 instead of the manual handle 10, and other configurations are the same as those in the second embodiment. Since it is the same as the example, the same reference numerals are given and the description thereof is omitted.

Next, the operation based on the configuration of the third embodiment will be described below. In order to move the backrest 5 horizontally with respect to the seat 4, the switch 12 is turned on and the motor 12 is rotated in a predetermined direction, for example, clockwise.

As the motor 12 rotates in a predetermined direction, the male screw 8 also integrally rotates in the same direction. An advancing / retreating screw hole 11 is screwed into the rotating male screw 8. The rotating male screw 8 is only rotatably held at the rear end side by the holding frame 9, and its movement in the front-rear direction is restricted.

For this reason, when the male screw 8 rotates, the advancing / retreating screw hole 11 screwed with the male screw 8 moves by screwing on the male screw 8. Since the moving forward / backward screw hole 11 is fixedly provided on the lower surface of the seat portion 4, when the forward / backward screw hole 11 moves, the seat portion 4 integrally moves horizontally in the same direction, for example, forward.

When it is desired to stop the forward horizontal movement of the seat portion 4, the switch of the motor 12 is stopped. In addition, if the seat portion 4 is to be horizontally moved backward, if the switch is switched and the motor 12 is rotated in the opposite direction, for example, in the counterclockwise direction, the seat portion 4 moves backward through the operation reverse to the above. To move horizontally.

The method of adjusting the height is the same as in the first and second embodiments, and therefore the description thereof is omitted.

The present invention is not limited to the above-mentioned embodiment, and it goes without saying that various modifications can be made without departing from the spirit of the present invention. For example, in the above embodiment, the case where the motor 12 is provided adjacent to the outside of the male screw 8 has been described, but the present invention is not limited to this. For example, the inside of the male screw 8 is hollow. The structure in which the motor 12 is embedded in the hollow, the one end of the rotation shaft of the motor 12 is projected to the outside from the end of the male screw 8, and the projecting one end is fixed to the holding frame 9. You may

[0054]

[Effect of device]

 As is clear from the above description, according to the chair according to the present invention, the seat portion can be horizontally moved in the front-rear direction with respect to the backrest portion, and the seat portion from the front end to the backrest portion can be freely moved. Substantial depth can be easily adjusted. In addition, the seat support surfaces are each formed to project, and the left and right ends of the rear lower surface of the seat are placed and supported on the seat support surfaces, so that the seat and the L-shaped support frame are fixed. Even if the stop bolts or the like come off or break, the seat does not immediately fall and safety is improved.

Further, by mounting the height adjusting plates having different plate thicknesses or adding a new height adjusting plate to adjust the height adjusting plates, the seat portion can be adjusted with respect to the floor surface. It can be adjusted freely in the height direction. In addition, since the height adjustment plates are in a stacked state, the seat does not immediately fall even if the locking bolt comes off or is broken, which improves safety. As a result, the posture of a person sitting on a chair, such as a child, can be maintained in a normal and safe manner, which is extremely useful in practice.

[Brief description of drawings]

FIG. 1 is a side view of a chair showing a first embodiment of the present invention.

FIG. 2 is a front view of the chair showing the first embodiment of the present invention.

FIG. 3 is a rear view of the chair according to the first embodiment of the present invention.

FIG. 4 is a plan view of the chair showing the first embodiment of the present invention.

FIG. 5 is a side sectional view of a chair showing a second embodiment of the present invention.

FIG. 6 is a view on arrow AA of FIG. 5 showing a second embodiment of the present invention.

FIG. 7 is a front view of a chair showing a second embodiment of the present invention.

FIG. 8 is a rear view of the chair according to the second embodiment of the present invention.

FIG. 9 is a side sectional view of a chair showing a third embodiment of the present invention.

[Explanation of symbols]

 1 L-shaped support frame 2 Bottom frame 2a Lower seat fixing hole 2b Height fixing hole 2c Overhanging bottom piece 2d Lower dovetail fitting protrusion 3 Vertical frame 3a Seat supporting surface 3b Upper seat fixing hole 3c Upper dovetail fitting protrusion 4 Seat 4a Leg 4b Lower screw hole 4c Upper screw hole 4d Lower dovetail groove 4e Upper dovetail groove 5 Backrest part 6 Height adjusting plate 6a Communication hole 7 Height adjusting plate 7a Height adjusting screw hole 8 Male screw 9 Holding frame 10 Manual Handle 11 Advance screw hole 12 Motor

Claims (3)

[Scope of utility model registration request] 1. An L-shaped support frame is composed of a bottom frame and a vertical frame extending upward from a rear end of the bottom frame, and a leg is provided at a front left and right end between a pair of left and right L-shaped support frames. And the seat portion formed on each of the left and right L-shaped support frames is formed between the upper portions of the vertical frames of the pair of left and right L-shaped support frames, and the seat portion supporting surface is provided on the inner side surface of each vertical frame below the backrest portion. Each of the L-shaped support frames is attached with a plurality of height adjusting plates that are stacked in the height direction on the bottom surface of the bottom frame of each L-shaped support frame, and is horizontally directed to the side surface of the bottom frame of each L-shaped support frame. To form a plurality of seat fixing holes, and on the side surface of the vertical frame of each L-shaped support frame, slightly above the seat portion support surface,
A seat fixing hole is formed in the left-right direction, a screw hole is formed in the left-right direction on the lower side surface of each leg of the seat part, and a plurality of screw holes are formed in the left-right direction on the left and right sides of the rear part of the seat part. A height adjusting plate formed by forming a plurality of height fixing holes downward on the upper surface of the bottom frame of each L-shaped support frame and stacking in the height direction on the lower surface of the bottom frame of the L-shaped support frame. In addition to forming a communication hole at a position corresponding to the hole position of the above height fixing hole, form a screw hole in the lowermost height adjusting plate, insert a stop bolt into each fixing hole, and insert the tip side of it. A chair characterized in that the seat portion is screwed into each screw hole so that the seat portion can be horizontally moved and adjusted with respect to the backrest portion in the front-rear direction and the seat portion can be adjusted in the height direction. 2. An L-shaped support frame is composed of a bottom frame and a vertical frame extending from a rear end of the bottom frame to an upper part thereof, and a leg is provided at a front left and right end between a pair of left and right L-shaped support frames. And the seat portion formed on each of the left and right L-shaped support frames is formed between the upper portions of the vertical frames of the pair of left and right L-shaped support frames, and the seat portion supporting surface is provided on the inner side surface of each vertical frame below the backrest portion. Each of the L-shaped support frames is provided with a plurality of height adjusting plates that are stacked in the height direction on the bottom surface of the bottom frame of each L-shaped support frame, and is directed downward on the top surface of the bottom frame of each L-shaped support frame. A plurality of height fixing holes are formed, and a communicating hole is formed at a position corresponding to the hole position of the height fixing hole in the height adjusting plate that is stacked in the height direction on the lower surface of the bottom frame of the L-shaped support frame. At the same time, screw holes are formed in the height adjusting plate at the bottom, and a fixing bolt is inserted into each fixing hole and the tip side is screwed into each screw hole. Groove fitting protrusions are formed, and dovetail grooves that fit with the dovetail groove fitting protrusions are formed on the left and right sides of the rear lower surface of the seat portion, respectively. Dovetail groove fitting projections are formed on the front side upper surface of the bottom piece, and dovetail grooves that fit with the dovetail groove fitting projections are formed on the lower surfaces of the left and right legs of the seat portion, respectively, and the shaft is provided below the seat portion. A male screw is arranged with the core oriented in the front-rear direction, and the male screw is rotatably held by a holding frame supported between left and right vertical frames, and an advancing / retreating screw hole for screwing with the male screw is provided on the lower surface of the seat portion. The seat part is formed projecting and the manual handle is attached to the rear end of the male screw, and the seat part can be horizontally moved and adjusted with respect to the backrest part by utilizing the screw movement of the forward and backward female screw hole that engages with the male screw. A chair whose parts are adjustable in the height direction. 3. An L-shaped support frame is composed of a bottom frame and a vertical frame extending upward from a rear end of the bottom frame, and a leg is provided at a front left and right end between a pair of left and right L-shaped support frames. And the seat portion formed on each of the left and right L-shaped support frames is formed between the upper portions of the vertical frames of the pair of left and right L-shaped support frames, and the seat portion supporting surface is provided on the inner side surface of each vertical frame below the backrest portion. Each of the L-shaped support frames is provided with a plurality of height adjusting plates that are stacked in the height direction on the bottom surface of the bottom frame of each L-shaped support frame, and is directed downward on the top surface of the bottom frame of each L-shaped support frame. A plurality of height fixing holes are formed, and a communicating hole is formed at a position corresponding to the hole position of the height fixing hole in the height adjusting plate that is stacked in the height direction on the lower surface of the bottom frame of the L-shaped support frame. At the same time, screw holes are formed in the height adjusting plate at the bottom, and a fixing bolt is inserted into each fixing hole and the tip side is screwed into each screw hole. Groove fitting protrusions are formed, and dovetail grooves that fit with the dovetail groove fitting protrusions are formed on the left and right sides of the rear lower surface of the seat portion, respectively. Dovetail groove fitting projections are formed on the front side upper surface of the bottom piece, and dovetail grooves that fit with the dovetail groove fitting projections are formed on the lower surfaces of the left and right legs of the seat portion, respectively, and the shaft is provided below the seat portion. A male screw is arranged with the core oriented in the front-rear direction, and the male screw is rotatably held by a holding frame supported between left and right vertical frames, and an advancing / retreating screw hole for screwing with the male screw is provided on the lower surface of the seat portion. The seat is projectingly formed, the male screw is linked to the motor, and the seat part can be horizontally moved in the longitudinal direction with respect to the backrest part by using the screw movement of the advancing / retreating female screw hole that engages with the male screw. A chair characterized by being adjustable in the height direction.