JP2007044449A - Kitchen chair - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a kitchen chair excellent in terms of universal design which makes it possible to comfortably perform various kinds of work such as cooking and dishwashing in a kitchen. <P>SOLUTION: The kitchen chair 1 is provided with a sitting part 20, leg parts 40 connected to the sitting part 20 and casters 100 with wheels provided on the lower end of the leg parts 40. The kitchen chair 1 is provided with rotation suppressing parts 115 and 135 for suppressing the rotation of the wheels 130 when a person to sit on the sitting part 20 is not seated, and the suppression of the rotation of the wheels by the rotation suppressing parts 115 and 135 is gradually canceled during the sitting action of the person to sit on a seat surface. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a kitchen chair that can be used in cooking and washing operations in a kitchen.

  In recent years, so-called system kitchens are often provided in kitchens. Such a system kitchen needs to have a storage space and be equipped with a sink for washing water, and moreover, the user frequently uses cooking equipment such as a surrounding gas range, oven, and microwave oven during cooking work. In general, the kitchen counter itself has a certain height in order to adopt a structure that enables kitchen work in a standing posture. In addition, with the recent increase in average height of Japanese people, the height of the kitchen counter itself has increased to, for example, about 850 mm.

  It is difficult for elderly people to cook and wash for a long time while standing by a kitchen counter that has a certain height, so the seat height is high and you sit on a part of the seat surface. However, there are cases where a kitchen chair is used that can ensure a posture that is not much different from a standing posture. However, if such a kitchen chair is seated at a fixed position on the kitchen floor, it will be forcibly bent when using peripheral cooking equipment such as a gas range, oven, and microwave oven around the kitchen counter during cooking. Or stretch your hand and put a burden on your body. In addition to this, there is a possibility that the kitchen chair may be tilted forcibly and fall down together with the chair.

  On the other hand, in order to increase the convenience of chairs used for office desks and study desks with low table heights rather than as chairs for kitchens, a structure having casters at the lower ends of the legs of such chairs is known. (For example, see Patent Document 1 and Patent Document 2).

  The caster for a chair described in Patent Document 1 includes a support yoke, a storage cylinder provided on one side of the support yoke, a receiving hole that penetrates a part of the support yoke, and a connecting pin that penetrates the receiving hole. The wheel provided through is provided. A braking member protrudes from the vicinity of the receiving hole, and this braking member is always pressed against the wheel peripheral surface of the wheel to always apply a pressing force to the peripheral surface of the wheel axle. As a result, the rotational force of the caster itself is weakened to prevent the chair from inadvertently moving backward.

On the other hand, the caster for a chair described in Patent Document 2 includes a frame in which an upper wall and a side wall are connected, a slider that can be moved up and down along the side wall, a spring that biases the upper wall and the slider in a separating direction, and a slider. On the other hand, it is provided with wheels that can rotate through a horizontal shaft. In addition, a gear portion is formed inside the wheel, and a claw is engaged with the gear portion when the slider approaches the frame. And by such a structure, a chair can be easily moved by making a wheel rotatable in the state where the person is not sitting. On the other hand, when a person sits down, the frame descends against the pressing force of the spring, the claw engages with the gear portion and the rotation of the wheel is locked, and the chair cannot be moved when sitting.
JP-A-10-81105 (page 2-3, FIG. 1) JP-A-9-315104 (2 pages, FIG. 1)

  As described above, the height of the seat surface of the kitchen chair is high, and the center of gravity becomes high when a person sits down. Therefore, when a so-called always-half-braking caster as described in Patent Document 1 is applied to a kitchen chair, the rotation suppression force is always applied even when the seated person sits on the chair. On the other hand, in addition to cooking, in order to put in and out cooking utensils and use a heating cooker and a sink, there is a case of moving parallel to the kitchen counter while sitting on a chair. However, if the chair is moved while sitting on a kitchen chair in order to use peripheral cooking devices such as a refrigerator, an oven, and a microwave oven, the chair may tilt and the seated person may fall. In addition, for example, while making tempura clothes, the hands are dirty, and the chair cannot be moved freely by pushing the kitchen counter with hands.

  In addition, the kitchen floor is generally flooring and is slippery, and the floor is often slippery due to the floor getting wet due to dishwashing or the like. Therefore, in a kitchen chair provided with a so-called always-half-braking caster as described in Patent Document 1, the caster can easily slide on the kitchen floor in a half-braking state before sitting on the chair. Therefore, when a seated person sits down on a kitchen chair with a high seating surface, the weight of the seated person acts diagonally with respect to the seating surface, and the kitchen chair slips on the kitchen floor during the seating operation. There is also a risk that the seated person may fall due to slipping.

  On the other hand, a chair provided with a caster as described in Patent Document 2 can move freely on the floor when a person is not sitting, but cannot easily move on the floor when a person sits. Therefore, if such a chair sits on the chair once, it will be able to perform its function when used in combination with, for example, a study desk or office desk, which requires work in a constant posture for a long time. When used as a chair, when the occupant sits on the kitchen chair as described above, the occupant may fall down due to the kitchen chair sliding or slipping on the kitchen floor during the sitting operation. In addition, the chair cannot be moved freely in order to use peripheral cooking equipment such as an oven or a microwave oven while sitting on the chair, and the kitchen chair suddenly moves on the kitchen floor when trying to move the chair forcibly. There is also a risk that the seated person may fall down.

  An object of the present invention is a kitchen chair that is excellent in terms of universal design that can comfortably prepare various dishes such as cooking and dishwashing in a kitchen. The object is to provide a kitchen chair that gradually reduces the restraining force.

In order to solve the above-described problems, the kitchen chair according to the present invention is:
A kitchen chair having a seating surface, a leg connected to the seating surface, and a wheeled caster provided on the leg,
The caster includes a caster main body, a caster mounting portion that is attached to a leg of the kitchen chair, a slider that can slide in a predetermined amount along the caster main body in the direction of the caster mounting portion, and is attached to the slider via an axle. A wheel, a caster body, a rotation restraining portion that is attached to the wheel and selectively restrains the rotation of the wheel, and is interposed between the caster body and the slider, and the slider is separated from the caster mounting portion. An elastic member that biases in the direction of
The rotation suppressing portion includes a stopper receiving protrusion formed on the side surface of the wheel at a predetermined interval in the circumferential direction, and a convex stopper formed on the caster body.
When the seated person is not seated, the stopper receiving projection interferes with the stopper to prevent the wheel from rotating, and when the seated person sits, the stopper receiving projection does not interfere with the stopper. The rotation restraining force exerted on the wheel by the rotation restraining portion is gradually reduced by allowing the stopper to get over the stopper receiving projection during the seating operation of the seated person. It is said.

  Before the seated person sits on the seat, the rotation of the caster wheel is suppressed, and this rotation control is released according to the seating motion of the seated person sitting on the seating surface. The kitchen chair does not move suddenly due to rotation or sliding on the kitchen floor, so you can sit in comfort. In addition, since the rotation of the casters is released after sitting, the seated person can freely move on the kitchen floor via the casters. Therefore, it is necessary to stand up from the kitchen chair each time when using peripheral cooking equipment such as a microwave oven or oven in addition to cooking work on the kitchen counter, dishwashing work in the sink, cooking work in the gas range. Disappear. That is, a series of operations associated with cooking can be performed while sitting on a kitchen chair, and these series of operations can be performed without placing a burden on the waist, legs, arms, and the like. Moreover, since it can sit down in comfort, the chair for kitchens can be used safely, even when standing and sitting frequently from a chair.

Moreover, the kitchen chair according to claim 2 of the present invention is the kitchen chair according to claim 1,
The stopper receiving protrusion is formed to be fixed to the wheel, and the stopper includes a roller that can rotate in accordance with the rotation direction of the wheel.

  By making the stopper a rotatable roller, the stopper gradually gets over the stopper receiving projection during the seating movement of the seated person, and the rotation restraining force exerted on the wheel by the rotation restraining part is gradually reduced. Can do.

Moreover, the kitchen chair according to claim 3 of the present invention is the kitchen chair according to claim 1 or 2,
The stopper receiving protrusion is made of a roller that can be rotated in accordance with the rotation direction of the wheel, and the stopper is made of a convex body that is fixed to the caster body.

  By making the stopper receiving protrusion a rotatable roller, the stopper gradually gets over the stopper receiving protrusion during the seating operation of the seated person, and the rotation suppressing portion gradually exerts the rotation suppressing force exerted on the wheel. Can be reduced.

The kitchen chair according to claim 4 of the present invention is the kitchen chair according to claim 1,
The stopper receiving protrusion is composed of a roller that can be rotated in accordance with the rotational direction of the wheel, and the stopper is also composed of a roller that can be rotated in accordance with the rotational direction of the wheel.

  By making the stopper and the stopper receiving protrusion a rotatable roller, the stopper gradually gets over the stopper receiving protrusion during the seating operation of the seated person, and the rotation suppressing force exerted on the wheel by the rotation suppressing part. Can be gradually reduced.

Moreover, the kitchen chair according to claim 5 of the present invention is
A kitchen chair having a seating surface, a leg connected to the seating surface, and a wheeled caster provided on the leg,
The caster includes a caster main body, a caster mounting portion that is attached to a leg of the kitchen chair, a slider that can slide in a predetermined amount along the caster main body in the direction of the caster mounting portion, and is attached to the slider via an axle. A wheel, a caster body, a rotation restraining portion that is attached to the wheel and selectively restrains the rotation of the wheel, and is interposed between the caster body and the slider, and the slider is separated from the caster mounting portion. An elastic member that biases in the direction of
The rotation suppression portion is a rotation suppression groove formed on a side surface of the wheel over the entire circumference in the circumferential direction, and an elastic body in which an uneven portion is continuously formed on a groove outer peripheral wall surface facing the axle of the rotation suppression groove. A rotation-suppressing groove formed on the caster body, and a convex stopper that selectively engages with the rotation-suppressing groove,
When the seated person is not seated, the stopper is fitted in the recess of the rotation restraining groove to prevent the wheel from rotating, and when the seated person is seated, the uneven part of the rotation restraining groove does not interfere with the stopper. The rotation suppression force that the rotation suppression unit exerts on the wheel gradually decreases by allowing the wheel to rotate and getting over the stopper while the convex portion of the rotation suppression groove is deformed during the seating operation of the seated person. It is characterized by doing.

  This configuration also has the same effect as that of the first aspect. In other words, before the seated person sits down on the seating surface, the rotation of the caster wheel is suppressed, and this rotational restraint is released according to the seating motion of the seated person sitting on the seating surface. The kitchen chair does not move suddenly due to wheel rotation or sliding on the kitchen floor, so you can sit down with confidence. In addition, since the rotation of the casters is released after sitting, the seated person can freely move on the kitchen floor via the casters. Therefore, it is necessary to stand up from the kitchen chair each time when using peripheral cooking equipment such as a microwave oven or oven in addition to cooking work on the kitchen counter, dishwashing work in the sink, cooking work in the gas range. Disappear. That is, a series of operations associated with cooking can be performed while sitting on a kitchen chair, and these series of operations can be performed without placing a burden on the waist, legs, arms, and the like. Moreover, since it can sit down in comfort, the chair for kitchens can be used safely, even when standing and sitting frequently from a chair.

  In particular, during the sitting movement of the seated person, the stopper gradually gets over with the convex part of the rotation suppression groove made of an elastic body deformed, and the rotation suppression force exerted on the wheel by the rotation suppression part gradually decreases. Can do.

The kitchen chair according to claim 6 of the present invention is the kitchen chair according to claim 5,
The stopper is composed of a roller that can rotate in accordance with the direction of rotation of the wheel.

  By making the stopper a rotatable roller, the stopper gradually gets over the convex part of the rotation suppression groove during the sitting movement of the seated person, and the rotation suppression force exerted on the wheel by the rotation suppression part is gradually reduced. Can do.

A kitchen chair according to claim 7 of the present invention is
A kitchen chair having a seating surface, a leg connected to the seating surface, and a wheeled caster provided on the leg,
The caster includes a caster main body, a caster mounting portion that is attached to a leg of the kitchen chair, a slider that can slide in a predetermined amount along the caster main body in the direction of the caster mounting portion, and is attached to the slider via an axle. A wheel, a caster body, a rotation restraining portion that is attached to the wheel and selectively restrains the rotation of the wheel, and is interposed between the caster body and the slider, and the slider is separated from the caster mounting portion. An elastic member that biases in the direction of
The rotation suppression groove is a rotation suppression groove formed on the side surface of the wheel over the entire circumference in the circumferential direction, and a rotation suppression groove in which uneven portions are continuously formed on a groove outer peripheral wall surface around the axle of the rotation suppression groove. And formed of a convex stopper that is formed on the caster body and selectively engages with the rotation suppression groove,
When the seated person is not seated, the stopper is fitted in the recess of the rotation restraining groove to prevent the wheel from rotating, and when the seated person is seated, the uneven part of the rotation restraining groove does not interfere with the stopper. The rotation restraining force exerted on the wheel by the rotation restraining portion gradually decreases when the wheel is rotatable and the stopper gets over the convex portion of the rotation restraining groove during the seating operation of the seated person. Yes.

  Even with this configuration, the same effects as in the first and fifth aspects can be obtained. In other words, before the seated person sits down on the seating surface, the rotation of the caster wheel is suppressed, and this rotational restraint is released according to the seating motion of the seated person sitting on the seating surface. The kitchen chair does not move suddenly due to wheel rotation or sliding on the kitchen floor, so you can sit down with confidence. In addition, since the rotation of the casters is released after sitting, the seated person can freely move on the kitchen floor via the casters. Therefore, it is necessary to stand up from the kitchen chair each time when using peripheral cooking equipment such as a microwave oven or oven in addition to cooking work on the kitchen counter, dishwashing work in the sink, cooking work in the gas range. Disappear. That is, a series of operations associated with cooking can be performed while sitting on a kitchen chair, and these series of operations can be performed without placing a burden on the waist, legs, arms, and the like. Moreover, since it can sit down in comfort, the chair for kitchens can be used safely, even when standing and sitting frequently from a chair.

The kitchen chair according to claim 8 of the present invention is the kitchen chair according to claim 7,
The stopper is composed of a roller that can rotate in accordance with the direction of rotation of the wheel.

  By making the stopper a rotatable roller, the stopper gradually gets over the stopper receiving projection during the seating movement of the seated person, and the rotation restraining force exerted on the wheel by the rotation restraining part is gradually reduced. Can do.

The kitchen chair according to claim 9 of the present invention is
A kitchen chair having a seating surface, a leg connected to the seating surface, and a wheeled caster provided on the leg,
The caster includes a caster main body, a caster mounting portion that is attached to a leg of the kitchen chair, a slider that can slide in a predetermined amount along the caster main body in the direction of the caster mounting portion, and is attached to the slider via an axle. A wheel, a caster body, a rotation restraining portion that is attached to the wheel and selectively restrains the rotation of the wheel, and is interposed between the caster body and the slider, and the slider is separated from the caster mounting portion. An elastic member that biases in the direction of
The rotation suppression portion is a rotation suppression groove formed on the side surface of the wheel over the entire circumference in the circumferential direction. The rotation suppression groove has a concavo-convex portion formed continuously on the outer circumferential wall surface of the rotation suppression groove. A plate-shaped stopper formed on the main body, and having a circular arc in accordance with the formation direction of the rotation suppression groove and a portion of which is selectively engaged with the rotation suppression groove,
When a seated person is not seated, a part of the stopper is engaged with the recess of the rotation restraining groove in a deformed state to prevent the wheel from rotating, and when the seated person is seated, the uneven part of the rotation restraining groove serves as the stopper. Rotation that the rotation suppression unit exerts on the wheel by allowing the wheel to rotate without interference and overcoming the convex portion of the rotation suppression groove while recovering the deformed state of the stopper during the seating operation of the seated person It is characterized by a gradual decrease in restraining power.

  Even with this configuration, the same effects as those of the first, fifth, and seventh aspects can be obtained. In other words, before the seated person sits down on the seating surface, the rotation of the caster wheel is suppressed, and this rotational restraint is released according to the seating motion of the seated person sitting on the seating surface. The kitchen chair does not move suddenly due to wheel rotation or sliding on the kitchen floor, so you can sit down with confidence. In addition, since the rotation of the casters is released after sitting, the seated person can freely move on the kitchen floor via the casters. Therefore, it is necessary to stand up from the kitchen chair each time when using peripheral cooking equipment such as a microwave oven or oven in addition to cooking work on the kitchen counter, dishwashing work in the sink, cooking work in the gas range. Disappear. That is, a series of operations associated with cooking can be performed while sitting on a kitchen chair, and these series of operations can be performed without placing a burden on the waist, legs, arms, and the like. Moreover, since it can sit down in comfort, the chair for kitchens can be used safely, even when standing and sitting frequently from a chair.

  In particular, during the seating operation of the seated person, while the deformed state of the stopper recovers, it gradually gets over the convex part of the rotation suppression groove, so that the rotation suppression force exerted on the wheel by the rotation suppression part can be gradually decreased. .

Moreover, the kitchen chair according to claim 10 of the present invention is the kitchen chair according to any one of claims 1 to 9,
The rotation suppression force exerted on the wheel by the rotation suppression unit becomes a maximum value before the seating of the seated person on the seat surface, decreases during the seating operation, and becomes zero or the minimum value after sitting. Yes.

  The rotation restraining force changes in this way with the sitting movement on the kitchen chair, so that the kitchen chair keeps a fixed position on the kitchen floor before the seated person sits on the kitchen chair, and after sitting The seated person can freely move the kitchen chair on the kitchen floor via the casters.

Moreover, the kitchen chair according to claim 11 of the present invention is the kitchen chair according to any one of claims 1 to 10,
A total sum of urging forces acting on the slider by the elastic member is approximately equal to or less than a total value of 196N plus the weight of the chair.

  When the sum of the urging forces of the elastic bodies acting on the slider becomes such a value, for example, even when a seated person with a comparatively light weight, such as a body weight of about 40 kg, sits on the kitchen chair, the rotation suppression unit suppresses the rotation of the wheel. Can be reliably released, and the action of the kitchen chair according to the present invention can be exhibited.

Moreover, the kitchen chair according to claim 12 of the present invention is the kitchen chair according to any one of claims 1 to 11,
The seat has a height of about 600 mm.

  By using the kitchen chair of such a height, it is possible to sit on the kitchen chair in a posture close to standing on the kitchen floor, and in addition to the above-mentioned action specific to the present invention, It becomes easy to perform a series of operations associated with dishwashing.

  According to the present invention, it is an excellent kitchen chair from the viewpoint of universal design that can comfortably prepare various dishes in the kitchen, such as cooking and dishwashing, and the wheel rotates during the seating operation of the seated person. A kitchen chair that gradually reduces the restraining force can be provided.

  Hereinafter, the kitchen chair according to the first embodiment of the present invention will be described. The kitchen chair 1 according to the first embodiment of the present invention is suitably used for a system kitchen SK having a certain height as shown in FIG. The system kitchen SK has a kitchen counter KC and a wall cabinet provided on the kitchen wall (not shown). The kitchen counter KC has a knee space at the bottom and a large number of storage spaces with drawers.

  In addition, a sink for dishwashing, a counter space for preparing ingredients for cooking, and a gas stove for cooking are provided above the kitchen counter KC.

  On the other hand, the wall cabinet includes, for example, a microwave oven, a range hood, and various storage spaces. Although not shown here, peripheral cooking devices such as an oven are also arranged around the kitchen counter KC.

  The height of the kitchen counter KC has a certain height of, for example, 850 mm as described in the prior art. The kitchen chair 1 according to the first embodiment of the present invention used for the system kitchen SK having such a height will be described below in detail with reference to the drawings.

  The kitchen chair 1 according to the first embodiment of the present invention includes, as shown in FIG. 2, a seat 20 that is a circular seat surface, a support 30 that supports the seat so that the height can be adjusted, and a support Five leg portions 40 extending radially at the lower end of the portion 30, a ring-shaped footrest portion 50 coupled to the upper end portion of each leg portion 40 to connect the end portions of the leg portions, A caster 100 provided on the lower side of the end portion is provided.

  The seating portion 20 is provided with a backrest portion 21 having a simple structure that can be folded toward the seating surface. Moreover, the seating part 20 is provided with a cushioning material having an appropriate hardness and a non-slipable skin covering the cushioning material so as to facilitate kitchen work.

  Further, a gas spring is built into the support column 30 and a height adjusting lever (not shown) that allows the height of the seat surface to be adjusted using the gas pressure of the gas spring at the lower portion of the seating portion 20. ). The kitchen chair 1 is placed in the knee space of the kitchen counter KC shown in FIG. 1 while the backrest 21 is tilted and the height of the seat surface of the kitchen chair 1 is lowered by holding the height adjusting lever. Can be accommodated.

  Next, the caster 100 provided in the kitchen chair 1 will be described. Each caster 100 has an equivalent configuration. Moreover, the description of the up-down direction, the left-right direction, the horizontal direction, and the vertical direction in the following description is a direction based on a state in which the kitchen chair 1 provided with such casters 100 is normally placed on the kitchen floor.

  Here, FIG. 3 is a cross-sectional view of the caster when the kitchen chair according to the first embodiment shown in FIG. 4 is a side view of the caster 100 shown in FIG. 5 is a cross-sectional view of the caster 100 when the kitchen chair shown in FIG. 2 is seated, cut along the axle 140 in the vertical direction. FIG. 6 is a side view of the caster shown in FIG.

  The caster 100 is a twin-wheel caster as shown in FIGS. 3 to 6, and includes a caster main body 110, a caster mounting portion 120 protruding from the upper surface of the caster main body 110, and wheels 130 provided on both side surfaces of the caster main body 110. It includes an axle 140 for connecting the wheels 130, a slider 150 provided on the axle 140, and a spring 160 accommodated in the caster body.

  The caster body 110 is made of a resin excellent in strength and moldability, such as nylon, and has a rectangular parallelepiped block shape as shown in FIGS. 3 and 5. In the vicinity of one end portion of the upper surface of the caster body, the caster 100 is made of a metal such as stainless steel (SUS) or iron that is connected to the leg portion 40 (see FIG. 2) while being rotatable in the horizontal direction. A shaft-shaped caster mounting portion 120 is provided in a state in which a part thereof is inserted into the caster main body 110. In addition, the caster main body 110 is formed with an odd-shaped rectangular slider accommodating portion 110a (see FIGS. 3 and 5) having four corners as viewed in a horizontal section.

  A convex spring support portion (not shown) that supports the spring 160 extends downward from the upper end surface 110b of the slider accommodating portion 110a.

  Further, on both side surfaces of the caster body 110 provided with the wheels 130, as shown in part in FIGS. 4 and 6, elongated hole-shaped axle through holes 113 having the vertical direction as a longitudinal direction are formed. The axle through hole 113 serves to regulate the movement amount of the slider 150 in the caster body by regulating the movement amount of the axle 140 in the caster body longitudinal direction. Further, as shown in FIGS. 3 and 5, a rotating roller (stopper) 115 that can rotate relative to the wheel via the rotating roller mounting portion 114 is rotatably provided above the opening of the axle through hole 113. ing. Although not shown in detail here, the rotating roller mounting portion 114 is fixed to the slider 150 with a fastener such as a screw, and a fitting rib is formed in the circumferential direction of the cylindrical protrusion. In addition, the rotation roller 115 is formed with a fitting groove that fits into the fitting rib so that the rotation roller 115 does not fall out of the rotation roller mounting portion 114. Further, the rotating roller mounting portion 114 and the rotating roller 115 are made of, for example, POM (polyacetal) having excellent moldability and sliding property and sufficient strength.

  The axle 140 is made of a shaft made of a metal such as stainless steel (SUS) or iron, for example. As shown in FIGS. 3 and 5, a slider 150 that can rotate relative to the axle 140 is provided at the center in the longitudinal direction. The wheels 130 are provided at both ends of the wheel 130 so as to be rotatable relative to the axle 140.

  The wheel 130 is made of, for example, a synthetic resin such as nylon, and the outer peripheral direction outer side thereof is covered with urethane rubber over the entire circumference in order to eliminate slippage between the kitchen floor and the wheel 130. Further, on the inner side surface of the wheel 130, that is, the surface facing the caster main body, a cylindrical stopper receiving protrusion 135 is formed to protrude at predetermined intervals in the circumferential direction over the entire inner periphery. The interval between the adjacent stopper receiving protrusions is such that the peripheral surface of the rotating roller 115 is sandwiched between the stopper receiving protrusions 135 when the seated person is not seated on the chair and the rotating roller 115 is adjacent to the stopper. The spacing is such that it hardly moves between the receiving protrusions (see FIG. 4). That is, as can be seen from these drawings, the rotation roller 115 and the stopper receiving protrusion 135 constitute a rotation suppressing portion, and the rotation roller 115 is engaged between the adjacent stopper receiving protrusions, whereby the wheel 130 is obtained. Is designed to suppress the rotation of the.

  The slider 150 is made of, for example, a resin such as nylon. As shown in FIGS. 3 and 5, the slider 150 has a rectangular parallelepiped shape and extends upward from four corners on the upper surface of the slider body through which the axle 140 passes. A slider guide (not shown) is provided. The slider guide slides along the guide accommodating portions formed at the four corners when viewed in the horizontal section of the slider accommodating portion 110a of the caster body 110, and moves the slider 150 smoothly in the vertical direction within the caster body. Playing a role.

  As shown in FIGS. 3 and 5, one end of the spring 160 is fitted to the upper surface convex portion (not shown) of the slider accommodating portion 110 a and the other end is pressed against the upper surface of the slider body. The slider guide is accommodated in the four corners of the slider accommodating portion 110a as described above, so that the spring 160 and the slider guide do not interfere when the slider 150 moves in the caster body.

  The spring 160 presses the axle 140 against the lower end of the long hole of the axle through hole 113 when the seated person is not seated on the kitchen chair 1, and causes the rotating roller 115 of the caster body 110 to adjoin the stopper receiving protrusion of the wheel 130. It has a biasing force that engages between them.

  Specifically, for example, in the case of the kitchen chair 1 provided with five casters 100, the total sum of the urging forces acting on the five sliders 150 is substantially equal to the value obtained by adding approximately 100N of the chair weight to approximately 196N. Or less.

  Accordingly, when a person is not sitting on the kitchen chair 1, the rotating roller 115 of the caster body 110 is engaged between adjacent stopper receiving protrusions located above the wheels 130 by the biasing force of the spring 160. The kitchen chair 1 is prevented from moving on the kitchen floor via the casters 100.

  When a person sits on the kitchen chair 1, the spring 160 is gradually compressed by the weight of the seated person according to the sitting operation, and the slider 150 and the axle 140 move relative to the slider accommodating portion 110 a in the caster body upward. It is designed to move.

  FIG. 44 is a diagram showing the angle of the thigh during seating movement and the load acting on the seat surface vertical downward of the kitchen chair 1. During such sitting operation, the load acting below the seat surface of the kitchen chair gradually increases in accordance with the seating movement of the seated person. Therefore, as shown in FIG. The sandwiched rotating roller 115 gradually comes out from between the protrusions and slowly moves over one stopper receiving protrusion 135 and moves between adjacent stopper receiving protrusions. As a result, the rotation suppression force of the wheel 130 is continuously reduced without being released at a time as the chair user sits.

  FIG. 45 is an explanatory diagram showing a change in rotation suppression force from before the seating through the seating operation to after the seating. In the first embodiment, as described above, as shown by the one-dot chain line (a) or the solid line (b) in the same figure, the rotation suppression force continuously decreases over at least the first half of the seating operation or throughout the seating operation. As shown in (c), the rotation restraining force is not released suddenly.

  Then, when fully seated on the kitchen chair 1, the rotating roller 115 does not come into contact with the stopper receiving projection 135 of the wheel 130 as shown in FIGS. Can rotate freely without obstructing rotation.

  Then, it confirms in detail about the actual usage method and effect | action of the kitchen chair 1 which has such a structure. First, the kitchen chair 1 accommodated in the knee space of the kitchen counter KC is pulled out to a position where the kitchen work can be easily performed as shown in FIG. And while raising the backrest part 21 (refer FIG. 2) of the chair 1 for kitchens, the height adjustment lever is held and the seat surface of the kitchen chair 1 is height-adjusted, for example to about 600 mm in height. Even when the kitchen chair 1 is pulled out from the knee space of the kitchen counter KC, the chair user presses the seat surface of the kitchen chair 1 to some extent by hand, so that the wheel rotation suppression force is reduced as in the seating operation described later. Therefore, it is possible to move the kitchen chair 1 while gradually rotating the wheel 130 of the caster 100 by pushing the seating surface by hand.

  As described above, after adjusting the seat surface of the kitchen chair 1 so that the seat surface is about 600 mm high and the chair user can maintain a posture close to the state of standing near the kitchen counter, sit. In the caster 100 of the kitchen chair 1 before sitting down, as shown in FIG. 4, the rotating roller 115 is sandwiched between the stopper receiving protrusions of the wheel 130, so that the wheel 130 of the caster 100 hardly rotates. ing. As a result, for example, even if the seating person takes a seating motion such that the seater sits on the front half of the seating surface and the buttocks of the seating person exerts a force obliquely against the seating surface, the kitchen chair 1 suddenly moves on the kitchen floor. Never slip out. The kitchen floor is generally made of flooring or wet due to dishwashing work, for example, so that it is generally easy to slip. However, the kitchen chair 1 according to the present embodiment has a seat on the seat. Since the wheel 130 of the caster 100 is still constrained from rotating at the moment of contacting, the kitchen chair 1 can be prevented from escaping at the moment of sitting.

  Subsequently, when the buttocks in contact with the seating surface are further pressed against the seating surface and fully seated on the kitchen chair 1, the spring 160 accommodated in the caster body is compressed in accordance with the seating operation, and the slider 150 is moved into the caster body. It starts to move relatively toward the upper surface of the slider accommodating portion. During the movement of the slider 150, the slider guide does not interfere with the spring 160 as described above. In addition, since the four elongated slider guides extending from the four corners of the upper surface of the slider main body move along the guide accommodating portions of the caster main body 110, the slider 150 is set within the slider accommodating portion of the caster main body 110. The slider 150 moves smoothly relative to the caster main body without any trouble.

  In this way, in a state where the slider 150 is slightly moved relative to the slider accommodating portion 110a in the caster body, the rotating roller 115 is slightly separated from between the stopper receiving protrusions by the cam action, and one stopper receiving protruding portion. It is easy to move between adjacent stopper receiving protrusions over the 135. That is, as shown in the dashed line (a) or solid line (b) in FIG. 45, the rotation suppression force continuously decreases at least in the first half of the seating operation or throughout the seating operation, and the rotation is suppressed as shown by the dotted line (c). Power is never released suddenly. As described above, since the rotation roller 115 is used as the rotation suppressing portion, the braking force acting on the caster 100 gradually decreases, and the risk is reduced. Accordingly, the seated person can detect that the wheel 130 of the caster 100 of the kitchen chair 1 gradually starts moving during the sitting operation. As a result, the rotation restraining force is suddenly released during the sitting operation on the kitchen chair 1 and the kitchen chair 1 can be prevented from suddenly moving, and the seated person can sit on the kitchen chair 1 with peace of mind. be able to.

  Subsequently, when the seated person further presses the buttocks and completely sits on the kitchen chair 1, the axle 140 reaches the upper end of the long hole of the axle through hole 113 provided in the caster body 110 as shown in FIGS. 5 and 6. As a result, the relative movement of the slider 150 toward the upper side in the slider accommodating portion in the caster body with respect to the caster body 110 stops.

  When the rotating roller 115 reaches the state shown in FIGS. 5 and 6, the rotating roller 115 no longer engages between the stopper receiving protrusions, and the wheel 130 can freely rotate. . As a result, the seated person can freely move on the kitchen floor together with the kitchen chair, for example, using his / her feet while sitting on the kitchen chair 1. This makes it possible to take various kitchen work such as taking out other dishes put in the oven while preparing the dishes and putting other dishes in the microwave without standing up from the chair 1 for kitchen. Can be done.

  In the present embodiment, the total sum of the urging forces that the five springs 160 act on the five sliders 150 is substantially equal to or less than the total value obtained by adding approximately 100 N of the chair weight to approximately 196 N. Even when a seated person having a relatively light weight of about 40 kg sits on the kitchen chair 1, the rotation suppression of the wheel 130 can be reliably released.

  Further, in the kitchen chair 1 described above, since the rotation suppressing portion including the rotation roller 115 and the stopper receiving protrusion 135 is formed inside the wheel 130, it is difficult for dust to clog the rotation suppressing portion during use of the chair. In addition, the clothes of the chair user are not sandwiched between the rotation suppressing portions.

  After performing kitchen work using such a kitchen chair 1, the chair user descends from the kitchen chair 1, collapses the backrest portion 21, holds the height adjustment lever, and lifts the height of the kitchen chair 1. The kitchen chair 1 is accommodated in the knee space of the kitchen counter KC while the wheel 130 of the caster 100 is gradually rotated while the seat surface is held by hand, and the kitchen work is finished.

  Subsequently, two modified examples of the kitchen chair according to the above-described embodiment will be described. In addition, about the structure similar to the kitchen chair 1 concerning 1st Embodiment mentioned above regarding this modification, a corresponding code | symbol is attached | subjected and detailed description is abbreviate | omitted.

  Here, FIG. 7 is a cross-sectional view of the caster 101 of the kitchen chair according to the first modified example cut in the vertical direction along the axle 140 when not seated. FIG. 8 is a side view of the caster 101 shown in FIG. FIG. 9 is a cross-sectional view of the caster 101 of the kitchen chair according to this modified example cut along the axle 140 in the vertical direction when seated. FIG. 10 is a side view of the caster 101 shown in FIG. FIG. 11 is a perspective view of the wheel 131 provided in the caster 101 shown in FIGS. FIG. 12 is a vertical sectional view including the central axis of the wheel 131 shown in FIG.

  As shown in FIGS. 7 and 9, a first modification of the kitchen chair includes a roller 137 whose stopper receiving protrusion can rotate in accordance with the rotation direction of the wheel, and a roller support that supports the roller 137. 136. On the other hand, a stopper that interferes with the stopper receiving protrusion and prevents the wheel 131 from rotating is formed on the caster body 111 as a cylindrical stopper 116. Thus, even if the stopper receiving protrusion is provided with the rotatable roller 137, the stopper 116 gradually gets over the roller 137 of the stopper receiving protrusion during the seating operation of the seated person by the cam action of the roller 137. Thus, the rotation suppression force exerted on the wheel 131 by the rotation suppression unit (the stopper 116 and the roller 137) can be gradually reduced (refer to FIG. 8 and FIG. 10 in comparison).

  Then, the 2nd modification of this kitchen chair is demonstrated. Here, FIG. 13 is a cross-sectional view in which the caster 102 of the kitchen chair according to the second modification is cut in the vertical direction along the axle 140 when not seated. FIG. 14 is a side view of the caster 102 shown in FIG. FIG. 15 is a cross-sectional view of the caster 102 of the kitchen chair according to this modification, taken along the axle 140 in the vertical direction when seated. FIG. 16 is a side view of the caster 102 shown in FIG. FIG. 17 is a perspective view of the wheel 132 provided in the caster 102 shown in FIGS. 18 is a vertical sectional view including the central axis of the wheel 132 shown in FIG.

  As shown in these drawings, in the second modification, the stopper receiving protrusion is composed of a roller 139 that can rotate in accordance with the rotational direction of the wheel and a roller support portion 138 that supports the roller 139, and the stopper also has a stopper. It comprises a roller 118 that can rotate in accordance with the direction of rotation of the wheel and a roller support portion 117 that supports the roller 118.

  By providing rotatable rollers 118 and 139 on the stopper and the stopper receiving protrusion, respectively, the stopper gradually moves the stopper receiving protrusion during the seating operation of the seated person by the mutual cam action of these rollers 118 and 139. As a result, the rotation suppression force exerted on the wheel by the rotation suppression unit can be gradually reduced.

  Then, the kitchen chair concerning the 2nd Embodiment of this invention is demonstrated. Since the structure of the kitchen chair according to the second embodiment is the same as the structure of the kitchen chair 1 according to the first embodiment except for the caster 200, only the structure of the caster 200 is shown. This will be described with reference to the drawings. Further, regarding the caster 200, the same structure as the caster 100 of the first embodiment is denoted by the corresponding reference numeral, and detailed description thereof is omitted. Moreover, since the material of each component also corresponds to the caster 100 according to the first embodiment, a part of the description is omitted.

  A caster 200 for a kitchen chair according to a second embodiment of the present invention includes a caster body 210, a caster mounting portion 220 provided so as to penetrate the caster body 210, and a caster body, as shown in FIGS. Wheels 230 provided on both side surfaces of 210, an axle 240 connecting the wheels 230, a slider 250 provided on the axle 240, and a spring 260 accommodated in the caster body.

  The caster main body 210 is made of the same material as that of the first embodiment and has the same configuration. Moreover, the axle through-hole 213 similar to 1st Embodiment is formed in the both sides | surfaces with which the wheel 230 of the caster main body 210 is provided (refer FIG.20, FIG.21 and FIG.23). Further, similarly to the first embodiment, a rotating roller 215 that can rotate relative to the wheel via a rotating roller mounting portion 214 is rotatably provided above the opening of the axle through hole 213. The axle 240 is made of the same material as that of the first embodiment and has the same configuration.

  The wheel 230 is made of, for example, a synthetic resin such as nylon, and the outer peripheral direction outer side is covered with nylon or urethane rubber over the entire circumference in order to eliminate slippage between the kitchen floor and the wheel 230. Further, on the inner side surface of the wheel 230, that is, the surface facing the caster body, there is a rotation suppression groove 235 made of a material having excellent elasticity such as an elastomer or rubber different from the outer peripheral surface of the wheel 230 over the entire inner periphery. Is formed. In addition, the wheel outer side and the wheel inner side which are different from each other are integrally formed by two-color molding or fitting. Moreover, as shown in FIG. 20, the uneven | corrugated | grooved part is continuously formed in the outer peripheral wall of the rotation suppression groove | channel 235 over the perimeter. Then, the rotation of the wheel 230 is suppressed by the above-described rotation roller 215 engaging with the recess 235a of the uneven portion.

  The slider 250 is made of the same material as that of the first embodiment and has the same configuration. The spring 260 is made of the same material as that of the first embodiment and has the same configuration. The spring 260 presses the axle 240 against the lower end of the long hole of the axle through hole 213 when the seated person is not seated on the kitchen chair, and causes the rotation roller 215 of the caster body 210 to be recessed in the rotation suppression groove 235 of the wheel 230. It has a biasing force to engage with 235a.

  Specifically, for example, in the case of a kitchen chair provided with five casters 200, the sum of the urging forces acting on the five sliders 150 is approximately 196 N, as in the first embodiment. It is almost equal to or less than the value obtained by adding 100N.

  Accordingly, when the person is not sitting on the kitchen chair, the rotating roller 215 of the caster body 210 is engaged with the concave portion 235 a positioned above the rotation suppression groove 235 of the wheel 230 by the biasing force of the spring 260. This prevents the kitchen chair from moving on the kitchen floor via the casters 200 (see FIG. 20).

  Further, when a person sits on the kitchen chair, the spring 260 is gradually compressed by the weight of the seated person in accordance with the sitting operation, and the slider 250 and the axle 240 are relatively moved upward with respect to the slider accommodating portion 210a in the caster body. To move to.

  Also in this embodiment, as can be seen from FIG. 44 showing the angle of the thigh during seating movement and the load acting vertically below the seating surface of the kitchen chair, during such a sitting operation, Since the load acting below the seat surface of the kitchen chair gradually increases in accordance with the seating movement, the rotating roller 215 engaged with the recess 235a of the rotation suppressing groove 235 as shown in FIG. 20 is shown in FIG. In addition, the convex portion 235 b of the rotation suppressing groove having elasticity is deformed so as to be compressed in the direction in which the rotating roller 215 travels. When the protrusion 235b is deformed, the height of the protrusion 235b when the rotation roller 215 gets over is lowered, so that the rotation roller 215 gradually comes out of the recess 235a of the rotation suppression groove 235, and the protrusion 235b is slowly moved. It gets over and moves to the adjacent recess 235a. As a result, as shown in FIG. 45, the rotation restraining force is continuously reduced without being released at a time as the chair user sits.

  Also in the second embodiment, as shown in the one-dot chain line (a) or solid line (b) in FIG. 45, the rotation suppression force continuously decreases over at least the first half of the seating operation or throughout the seating operation. As shown in (c), the rotation restraining force is not released suddenly.

  Then, when completely sitting on the kitchen chair, as shown in FIG. 23, the rotation roller 215 does not come into contact with the convex portion 235b of the rotation suppression groove 235 of the wheel 230. In this state, the wheel 230 is moved by the rotation roller 215. It can rotate freely without hindering rotation.

  Even with the kitchen chair having such a configuration, the same effect as the kitchen chair of the first embodiment is exhibited. Hereinafter, this action will be reconfirmed in detail. As shown in FIG. 20, the caster 200 of the kitchen chair before the seated person sits has the rotation roller 215 engaged with the recess 235a of the rotation suppression groove 235 of the wheel 130 so that the wheel 230 of the caster 200 does not rotate. It has become. This makes it possible for the kitchen chair to suddenly move on the kitchen floor even when the seated person takes a seating action such as sitting on the front half of the seating surface and the buttocks of the seated person exerts an oblique force on the seating surface. There is no sliding out. The kitchen floor is generally made of flooring or wet due to dishwashing work, etc., so it is generally easy to slip, but the kitchen chair according to the second embodiment is used by a seated person. Since the wheel 230 of the caster 200 is still restrained from rotating at the moment of contacting the buttocks, the kitchen chair can be prevented from escaping at the moment of sitting.

  Subsequently, when the buttocks that are in contact with the seating surface are further pressed against the seating surface and sat sufficiently on the kitchen chair, the spring 260 accommodated in the caster body is compressed in accordance with the seating operation, and the slider 250 is moved into the caster body. It starts to move relatively toward the upper surface of the slider accommodating portion. During the movement of the slider 250, the slider guide (not shown) does not interfere with the spring 260 as described above. Further, the four elongated slider guides extending from the four corners of the upper surface of the slider 250 are moved along the slider accommodating portions 210a of the caster body 210, so that the slider 250 is moved within the slider accommodating portion of the caster body 210. The slider 250 moves relatively smoothly in the caster main body without being pushed.

  In this way, in a state where the slider 250 moves slightly relative to the slider accommodating portion 210a in the caster body, the rotating roller 215 shown in FIG. 20 is slightly separated from the bottom surface of the recess of the rotation suppressing groove 235, as shown in FIG. Then, it is easy to move over to the adjacent concave portion 235a over the deformation while deforming the horizontal convex portion 235b. That is, as shown in the dashed line (a) or solid line (b) in FIG. 45, the rotation suppression force continuously decreases at least in the first half of the seating operation or throughout the seating operation, and the rotation is suppressed as shown by the dotted line (c). Power is never released suddenly. As described above, since the rotation suppressing portion is composed of the rotating roller 215 and the elastic rotation suppressing groove 235, the braking force acting on the caster 200 gradually decreases, and the risk is reduced. Accordingly, the seated person can detect that the wheel 230 of the caster 200 of the kitchen chair gradually starts moving during the sitting operation. As a result, the rotation restraining force is suddenly released during the sitting operation on the kitchen chair, so that the kitchen chair can be prevented from suddenly moving, and the seated person can sit on the kitchen chair with peace of mind. .

  When the rotating roller 215 reaches the state shown in FIG. 23, the rotating roller 215 no longer engages with the concavo-convex portion of the rotation suppressing groove 235, and the wheel 230 can freely rotate. As a result, the seated person can freely move on the kitchen floor together with the kitchen chair, for example, using the feet of the seated person while sitting on the kitchen chair. This makes it possible to perform various kitchen tasks such as taking out other dishes placed in the oven while preparing the dishes and putting other dishes in the microwave oven while sitting without standing up from the kitchen chair. Is possible.

  Also in this second embodiment, the total sum of the urging forces that the five springs 260 act on the five sliders 250 is approximately equal to or less than the total value of approximately 196N plus the chair weight of approximately 100N. Therefore, for example, even when a seated person with a relatively light weight of about 40 kg is seated on a kitchen chair, the rotation suppression of the wheel 230 can be reliably released.

  Moreover, since the rotation suppression part is formed in the inner side of the wheel 230, the kitchen chair mentioned above does not clog garbage in the rotation suppression part during the use of the chair, and the clothes of the chair user are in this rotation suppression part. There is no such thing as being caught.

  The stopper of the caster for the kitchen chair according to the second embodiment described above is not necessarily required to be the rotating roller 215 as long as the rotation suppressing groove 235 is made of a deformable elastic body. Even if it has a cylindrical protrusion, the same effect can be obtained.

  Then, the kitchen chair concerning the 3rd Embodiment of this invention is demonstrated. Since the structure of the kitchen chair according to the third embodiment is the same as the structure of the kitchen chair according to the first embodiment except for the caster 300, only the structure of the caster 300 is illustrated. Based on Further, regarding the caster 300, the same structure as the caster 100 of the first embodiment is denoted by the corresponding reference numerals, and detailed description thereof is omitted. Moreover, since the material of each component also corresponds to the caster 100 according to the first embodiment, the description thereof is omitted.

  Here, FIG. 25 is a cross-sectional view of the caster 300 provided in the kitchen chair according to the third embodiment of the present invention cut in the vertical direction along the axle 340 when not seated. FIG. 26 is a side view of the caster 300 shown in FIG. FIG. 27 is a cross-sectional view of the caster 300 provided in the kitchen chair according to the third embodiment, cut in the vertical direction along the axle 340 when seated. FIG. 28 is a side view of the caster 300 shown in FIG. FIG. 29 is a perspective view of wheels provided in the caster 300 shown in FIGS.

  A caster 300 for a kitchen chair according to a third embodiment of the present invention includes a caster body 310, a caster mounting portion 320 provided so as to penetrate the caster body 310, and a caster body, as shown in FIGS. A wheel 330 provided on both side surfaces of 310, an axle 340 connecting the wheels 330, a slider 350 provided on the axle 340, and a spring 360 housed in the caster body.

  The caster body 310 is made of the same material as that of the first embodiment and has the same configuration. However, as a difference from the first embodiment, the wheels 330 are arranged below the axle 340 on the side surface of the caster body. A cylindrical stopper 315 is formed so as to project toward the inner surface of the projection.

  The axle 340 is made of the same material as that of the first embodiment and has the same configuration. The wheel 330 is made of, for example, a synthetic resin such as nylon, and the outer circumferential direction outer side thereof is covered with urethane rubber over the entire circumference in order to eliminate slippage between the kitchen floor and the wheel 330. In addition, a rotation suppression groove 335 is formed on the inner side surface of the wheel 330, that is, the surface facing the caster body, over the entire inner periphery. In addition, as shown in FIGS. 26 and 28, uneven portions are alternately and continuously formed on the outer peripheral wall around the axle of the rotation suppression groove 335 as shown in FIGS. The rotation of the wheel 330 is suppressed by engaging the stopper 315 described above with the concave portion 335a of the concave and convex portion.

The slider 350 is made of the same material as that of the first embodiment and has the same configuration. The spring 360 is made of the same material as that of the first embodiment and has the same configuration. Note that the spring 360 moves the axle 340 to the axle when a seated person is not sitting on the kitchen chair. It has a biasing force that presses against the lower end of the long hole of the through-hole 313 and presses the stopper 315 of the caster body 310 against the recess 335a of the rotation suppression groove 335 of the wheel 330 from below.

  Specifically, for example, in the case of a kitchen chair provided with five casters 300, the sum of the urging forces acting on the five sliders 350 is approximately 196 N, as in the first embodiment. It is almost equal to or less than the value obtained by adding 100N. Accordingly, when the person is not sitting on the kitchen chair, the stopper 315 is engaged with the recess 335 a located above the rotation suppression groove 335 of the wheel 330 by the biasing force of the spring 360. The kitchen chair does not move on the kitchen floor via the caster 300.

  In addition, when a person sits on the kitchen chair, the spring 360 is gradually compressed by the weight of the seated person in accordance with the sitting operation, and the slider 350 and the axle 330 are relatively moved upward with respect to the slider accommodating portion 310a in the caster body. To move to.

  As can be seen from FIG. 44, which shows the angle of the thigh during seating movement and the load acting vertically below the seating surface of the kitchen chair, during such a sitting operation, the kitchen moves according to the seating movement of the seated person. Since the load acting below the seat surface of the chair is gradually increased, the stopper 315 engaged with the recess 335a of the rotation suppression groove 335 gradually comes out of the recess 335a of the rotation suppression groove 335 as shown in FIG. And move over the convex portion 335b to the adjacent concave portion 335a. As a result, as shown in FIG. 45, the rotation restraining force is continuously reduced without being released at a time as the chair user sits.

  As can be seen from the explanatory diagram of FIG. 45, in the present embodiment, as described above, the rotation suppression force is at least in the first half of the seating operation or the entire seating operation as shown by the alternate long and short dash line (a) or solid line (b) in the drawing. As shown by the dotted line (c), the rotation suppression force is not suddenly released.

  Then, when completely sitting on the kitchen chair 1, the stopper 315 does not come into contact with the convex portion 335 b of the rotation suppression groove 335 of the wheel 330 as shown in FIG. 28, and the wheel 330 is rotated by the stopper 315 in this state. It will be able to rotate freely without hindering.

  Even with the kitchen chair having such a configuration, the same effect as the kitchen chair of the first embodiment is exhibited. Hereinafter, this action will be reconfirmed in detail. As shown in FIG. 26, the caster 300 of the kitchen chair before the seated person sits has the stopper 315 engaged with the recess 335a of the rotation suppression groove 335 of the wheel 330 so that the wheel 330 of the caster 300 does not rotate. It has become. This makes it possible for the kitchen chair to suddenly move on the kitchen floor even when the seated person takes a seating action such as sitting on the front half of the seating surface and the buttocks of the seated person exerts an oblique force on the seating surface. There is no sliding out. The kitchen floor is generally made of flooring or wet by dishwashing work, for example, so it is generally easy to slip. However, the kitchen chair according to the third embodiment has a seating surface for the seated person. Since the wheel 330 of the caster 300 is still constrained from rotating at the moment of contacting the buttocks, the kitchen chair can be prevented from escaping at the moment of sitting.

  Subsequently, when the buttocks that are in contact with the seating surface are further pressed against the seating surface and sat sufficiently on the kitchen chair, the spring 360 accommodated in the caster body is compressed in accordance with the seating operation, and the slider 350 is moved into the caster body. It starts to move relatively toward the upper surface of the slider accommodating portion.

  Thus, in a state in which the slider 350 is slightly moved relative to the slider accommodating portion 310a in the caster body, the stopper 315 shown in FIG. 26 is slightly separated from the bottom surface of the concave portion of the rotation suppressing groove 335, and the lateral convex portion 335b is removed. It is easy to get over and move to the adjacent recess 335a. That is, as shown in the dashed line (a) or solid line (b) in FIG. 45, the rotation suppression force continuously decreases at least in the first half of the seating operation or throughout the seating operation, and the rotation is suppressed as shown by the dotted line (c). Power is never released suddenly. Thus, since the rotation suppression part is comprised from the stopper 315 and the rotation suppression groove | channel 335, the braking force which acts on the caster 300 will fall gradually, and danger will reduce. Thus, the seated person can detect that the wheel 330 of the caster 300 of the kitchen chair gradually starts moving during the sitting operation. As a result, the rotation restraining force is suddenly released during the sitting operation on the kitchen chair, so that the kitchen chair can be prevented from suddenly moving, and the seated person can sit on the kitchen chair with peace of mind. .

  When the stopper 315 reaches the state as shown in FIG. 28, the stopper 315 no longer engages with the concavo-convex portion of the rotation suppressing groove 335, and the wheel 330 can freely rotate. As a result, the seated person can freely move on the kitchen floor together with the kitchen chair, for example, using the feet of the seated person while sitting on the kitchen chair. This makes it possible to perform various kitchen tasks such as taking out other dishes placed in the oven while preparing the dishes and putting other dishes in the microwave oven while sitting without standing up from the kitchen chair. Is possible.

  Also in this third embodiment, the total urging force of the five springs 160 acting on the five sliders 350 is approximately equal to or less than the total value of approximately 196N plus the chair weight of approximately 100N. Therefore, for example, even when a seated person with a relatively light weight of about 40 kg is seated on a kitchen chair, the rotation suppression of the wheel 130 can be reliably released.

  Further, the above-described kitchen chair also has a rotation suppression portion (rotation suppression groove 335 and stopper 315) formed inside the wheel 330, so that it is difficult for the garbage to clog the rotation suppression portion during use of the chair, and the chair is used. The person's clothes are not caught between the rotation restraining portions.

  Then, the modification of the kitchen chair concerning 3rd Embodiment mentioned above is demonstrated. In addition, about the structure similar to the kitchen chair concerning 3rd Embodiment mentioned above regarding this modification, a corresponding code | symbol is attached | subjected and detailed description is abbreviate | omitted.

  Here, FIG. 30 is a cross-sectional view of the caster 301 provided in the kitchen chair according to the modification of the third embodiment, cut in the vertical direction along the axle 340 when not seated. FIG. 31 is a side view of the caster shown in FIG. FIG. 32 is a cross-sectional view of a caster 301 provided in a kitchen chair according to a modification of the third embodiment, cut in the vertical direction along the axle 340 when seated. FIG. 33 is a side view of the caster 301 shown in FIG. FIG. 34 is a partially enlarged view showing the periphery of the caster body 311, the axle 340, and the rotating roller 317 in FIG. 33.

  As shown in FIG. 30, the kitchen chair has a rotation roller 317 that can be rotated in accordance with the rotation direction of the wheel 331 and a roller support member 316 that supports the rotation roller 317 instead of the stopper 315. Yes. Thus, by providing the rotatable roller 317 instead of the stopper 315, the rotating roller 317 gradually gets over the convex portion 336b of the rotation suppression groove 336 during the seating operation of the seated person by the cam action of the rotating roller 317. Thus, the rotation suppression force exerted on the wheel 331 by the rotation suppression unit (the rotation suppression groove 336 and the rotation roller 317) can be gradually reduced.

  Then, the kitchen chair concerning the 4th Embodiment of this invention is demonstrated. The structure of the kitchen chair according to the fourth embodiment is the same as the structure of the kitchen chair according to the above-described embodiment except for the caster 400, and therefore only the structure of the caster 400 is shown in the drawing. This will be explained based on. Further, regarding the caster 400, the same structure as the caster 100 of the first embodiment is denoted by the corresponding reference numerals, and detailed description thereof is omitted. Moreover, since the material of each component also corresponds to the caster 100 according to the first embodiment, the description thereof is omitted.

  Here, FIG. 35 is a cross-sectional view of the caster 400 provided in the kitchen chair according to the fourth embodiment of the present invention cut in the vertical direction along the axle 440 when not seated. FIG. 36 is a side view of the caster 400 shown in FIG. FIG. 37 is an enlarged view around the stopper shown in FIG. FIG. 38 is a side view showing the caster 400 provided in the kitchen chair according to the fourth embodiment during the seating operation. FIG. 39 is an enlarged view around the stopper shown in FIG. FIG. 40 is a cross-sectional view of the caster 400 provided in the kitchen chair according to the fourth embodiment, cut in the vertical direction along the axle 440 when seated on the kitchen chair. FIG. 41 is a side view of the caster 400 shown in FIG. FIG. 42 is an enlarged view around the stopper shown in FIG.

  A caster 400 for a kitchen chair according to the fourth embodiment of the present invention includes a caster body 410, a caster mounting portion 420 provided so as to penetrate the caster body 410, and the caster body 410. A wheel 430 provided on both side surfaces, an axle 440 connecting the wheels 430, a slider 450 provided on the axle 440, and a spring 460 accommodated in the caster body.

  The caster body 410 is made of the same material as that of the first embodiment and has the same configuration. However, the caster body 410 is different from the first embodiment in that rotation is suppressed above the opening of the axle through hole 413. A plate-like stopper 415 is formed in which an arc is formed in accordance with the forming direction of the groove 435 and a part thereof is selectively engaged with the recess 435a of the rotation suppressing groove 435.

  The axle 440 is made of the same material as that of the first embodiment and has the same configuration. The wheel 430 is made of, for example, a synthetic resin such as nylon, and the outer periphery side thereof is covered with urethane rubber over the entire circumference in order to eliminate slippage between the kitchen floor and the wheel 430. In addition, a rotation suppression groove 435 is formed on the inner side surface of the wheel 430, that is, the surface facing the caster body, over the entire inner periphery. Moreover, as shown in FIG. 36, the uneven | corrugated | grooved part is continuously formed in the outer peripheral wall of this rotation suppression groove | channel 435 over the perimeter. When the seat occupant is not seated, a part of the arc-shaped stopper 415 is fitted in the recess 435a of the rotation restraint groove 435 in a deformed state to prevent the wheel 430 from rotating, and when the seat occupant is seated, the rotation restraint groove 435 The uneven part makes the wheel 430 rotatable without interfering with the stopper 415. In addition, during the seating operation of the seated person, the rotation restraining portion composed of the stopper 415 and the rotation restraining groove 435 is prevented from exerting on the wheel 430 by overcoming the convex portion 435b of the rotation restraining groove 435 while the deformed state of the stopper 415 is recovered. The force gradually decreases, and the rotation of the wheel 430 is suppressed.

  The slider 450 is made of the same material as that of the first embodiment and has the same configuration. The spring 460 is made of the same material as that of the first embodiment and has the same configuration. The spring 460 presses the axle 440 against the lower end of the long hole of the axle through hole 413 when the seated person is not seated on the kitchen chair, and the stopper 415 of the caster body 410 is recessed in the rotation restraining groove 435 of the wheel 430. It has an urging force that can be fitted while being deformed.

  Specifically, for example, in the case of a kitchen chair provided with five casters 400, the sum of the urging forces acting on the five sliders 450 is about 196 N, as in the first embodiment. It is almost equal to or less than the value obtained by adding 100N. As a result, when the person is not sitting on the kitchen chair, the stopper 415 is deformed by the biasing force of the spring 460 so that a part of the stopper 415 of the caster body 410 is deformed into the recess 435a located above the rotation suppression groove 435 of the wheel 430. By fitting it as it is, the kitchen chair does not move on the kitchen floor via the casters 400.

  In addition, when a person sits on the kitchen chair, the spring 460 is gradually compressed by the weight of the seated person according to the sitting operation, and the slider 450 and the axle 430 are relatively moved upward with respect to the slider accommodating portion 410a in the caster body. To move to.

  As can be seen from FIG. 44, which shows the angle of the thigh during seating movement and the load acting vertically below the seating surface of the kitchen chair, during such a sitting operation, the kitchen moves according to the seating movement of the seated person. Since the load acting below the seat surface of the chair is gradually increased, the deformation of the stopper 415 engaged with the recess 435a of the rotation suppressing groove 435 as shown in FIGS. 36 and 37 is shown in FIGS. While recovering to the convex portion 435b of the rotation suppression groove 435, it gradually gets out of the concave portion 435a of the rotation suppression groove 435 and slowly gets over the convex portion 435b and moves to the adjacent concave portion 435a. As a result, as shown in FIG. 45, the rotation restraining force is continuously reduced without being released at a time as the chair user sits.

  That is, as shown in FIG. 45, also in this embodiment, as described above, as shown in the dashed line (a) or solid line (b) in FIG. It continuously decreases and the rotation suppression force is not released suddenly as shown by the dotted line (c).

  Then, when sitting completely on the kitchen chair, the stopper 415 does not come into contact with the convex portion 435b of the rotation suppression groove 435 of the wheel 430 as shown in FIG. 41 and FIG. Can rotate freely without obstructing rotation.

  Even with the kitchen chair having such a configuration, the same effect as the kitchen chair of the first embodiment is exhibited. That is, in the caster 400 of the kitchen chair before the seated person sits down, the stopper 415 is engaged with the recess 435a of the rotation suppression groove 435 of the wheel 430 as shown in FIGS. Does not rotate. This makes it possible for the kitchen chair to suddenly move on the kitchen floor even when the seated person takes a seating action such as sitting on the front half of the seating surface and the buttocks of the seated person exerts an oblique force on the seating surface. There is no sliding out. The kitchen floor is generally made of flooring or wet due to dishwashing work, etc., so it is generally easy to slip, but the kitchen chair according to this embodiment has a butt on the seat. At the moment of contact, the wheel 430 of the caster 400 is still constrained from rotating and cannot move, so that the kitchen chair can be prevented from escaping at the moment of sitting.

  Subsequently, when the buttocks that are in contact with the seating surface are further pressed against the seating surface and sat sufficiently on the kitchen chair, the spring 460 accommodated in the caster body is compressed in accordance with the seating operation, and the slider 450 is moved into the caster body. It starts to move relatively toward the upper surface of the slider accommodating portion.

  Thus, in a state in which the slider 450 is slightly moved relative to the slider accommodating portion 410a in the caster main body, the stopper 415 shown in FIGS. 36 and 37 is pressed against the recess 435a of the rotation suppressing groove 435 and deformed. As shown in FIGS. 38 and 39, the deformation is recovered from the state, and it is easy to move over the adjacent convex portion 435b to the adjacent concave portion 435a. That is, as shown in the dashed line (a) or solid line (b) in FIG. 45, the rotation suppression force continuously decreases at least in the first half of the seating operation or throughout the seating operation, and the rotation is suppressed as shown by the dotted line (c). Power is never released suddenly. Thus, since the rotation suppression part is comprised by the stopper 415 and the rotation suppression groove 435, the brake force which acts on the caster 400 will fall gradually, and danger will reduce. Accordingly, the seated person can detect that the wheel 430 of the caster 400 of the kitchen chair gradually starts moving during the sitting operation. As a result, the rotation restraining force is suddenly released during the sitting operation on the kitchen chair, so that the kitchen chair can be prevented from suddenly moving, and the seated person can sit on the kitchen chair with peace of mind. .

  Then, when the stopper 415 reaches the state as shown in FIG. 38, the stopper 415 no longer engages with the concavo-convex portion of the rotation suppression groove 435, and the wheel 430 can freely rotate. As a result, the seated person can freely move on the kitchen floor together with the kitchen chair, for example, using his / her feet while sitting on the kitchen chair 1. As a result, various kitchen tasks such as taking out other dishes placed in the oven while preparing the dishes and putting other dishes in the microwave oven are performed in a sitting posture without standing up from the kitchen chair 1. It becomes possible.

  In the fourth embodiment, the sum of the urging forces applied to the five sliders 450 by the five springs 460 is substantially equal to or less than the total value obtained by adding approximately 100 N of the chair weight to approximately 196 N. Therefore, for example, even when a seated person having a relatively light weight of about 40 kg sits on a kitchen chair, the rotation suppression of the wheel 430 can be reliably released.

  Moreover, since the rotation suppression part (the rotation suppression groove | channel 435 and the stopper 415) is formed inside the wheel 430, the kitchen chair mentioned above does not clog garbage in the rotation suppression part during the use of the chair, and the chair is used. The person's clothes are not caught between the rotation restraining portions.

  Although the kitchen chair described above can adjust the height of its seating surface, it is not always necessary to provide a height adjustment mechanism in this way, and the height of the seating surface is fixed to about 600 mm. May be.

  In addition, it is possible to exhibit the same effect even if the stopper receiving protrusion 135 of the first embodiment is formed on the wheel instead of the rotation suppression groove 435 described above in the present embodiment.

    FIG. 43 shows a modification of the fourth embodiment. This modification is the same as the fourth embodiment except that the width of the rotation suppression groove 435 (symbol W in FIG. 43) and the thickness of the stopper 415 (symbol T in FIG. 43) are adjusted to be seated on the kitchen chair. The degree to which the release of the rotation suppression force during operation is gradually performed is adjusted. That is, compared with the fourth embodiment (FIG. 41), the width W of the rotation suppression groove 435 in this modification is reduced to reduce the engagement amount of the stopper 415, and the thickness T of the stopper 415 is increased. By increasing the rigidity of the stopper 415 and reducing the deformation amount, the degree of brake release is accelerated. Therefore, by appropriately adjusting the width of the rotation suppression groove 435 (symbol W in FIG. 43) and the thickness of the stopper 415 (symbol T in FIG. 43) as described above, the startability during the seating operation is improved. For example, even when the seated person puts an extremely biased weight on the seating part, the brake can be gradually released depending on the purpose, such as being able to use without disturbing the mobility of the chair The degree can be adjusted.

  Subsequently, specific operational effects of the kitchen chair according to each of the embodiments described above and the modifications thereof will be confirmed using a comparison table shown in FIG. The comparison table shown in the figure shows a chair that does not have casters, a chair that has casters and is always movable, a chair that has casters but does not sit on the seat, and a wheel that rotates the caster wheel only. It is the comparison table which compared the chair for kitchens concerning the embodiment mentioned above and its modification as an example of an invention, and made the chair which always had bad movement of the wheel of a caster as a comparative example.

  In addition, the caster of patent document 1 demonstrated by the prior art is equivalent to the caster of the chair where the motion of a caster always becomes a half-braking state, and the motion of the wheel of the caster mentioned above is always bad. Moreover, the caster described in Patent Document 2 corresponds to a caster of a chair in which a wheel of the caster rotates only when the caster is provided but is not seated on a seating surface.

  From the comparison between the product of the present invention shown in FIG. 46 and a chair having another configuration, the product of the present invention does not move when sitting, and the chair moves after sitting, so it has become flooring. It can be seen from the left column of the comparison table that the kitchen floor according to the present invention is most easily seated when the kitchen chair according to the present invention is provided on a kitchen floor having special circumstances that are often wet due to dishwashing work or the like.

  In addition, in the case of kitchen work, after sitting down like a chair for an office desk or a chair for a study desk, it does not remain on the chair for a long time, and in addition to cooking work such as preparing ingredients and gas range In addition, since it is necessary to perform various operations such as putting in and out dishes in an oven or a microwave oven, the present invention product that can perform these series of kitchen operations while sitting on a kitchen chair is particularly suitable as a kitchen chair. It can be seen from the right column of the comparison table that it is functionally suitable.

It is the perspective view which showed the system kitchen in which the kitchen chair concerning the 1st Embodiment thru | or 4th Embodiment and these modifications of this invention are used, and the kitchen chair concerning 1st Embodiment. It is a perspective view of the kitchen chair concerning the 1st Embodiment of the present invention. It is sectional drawing which cut | disconnected the caster with which the chair for kitchens concerning 1st Embodiment shown in FIG. 2 was equipped in the perpendicular direction along the axle shaft at the time of non-seating. It is a side view of the caster shown in FIG. It is sectional drawing which cut | disconnected the caster at the time of seating of the kitchen chair shown in FIG. 2 along the axle | axis axis | shaft in the perpendicular direction. It is a side view of the caster shown in FIG. It is sectional drawing which cut | disconnected the vertical direction of the modification of the caster at the time of the non-sitting to the kitchen chair shown in FIG. It is a side view of the caster shown in FIG. It is sectional drawing which cut | disconnected the caster concerning the modification of the kitchen chair shown in FIG. 3 in the perpendicular direction along the axle shaft at the time of seating. FIG. 10 is a side view of the caster shown in FIG. 9. It is a perspective view of the wheel with which the caster shown in Drawing 7 thru / or Drawing 10 was equipped. FIG. 12 is a vertical sectional view including the center axis of the wheel shown in FIG. 11. It is sectional drawing which cut | disconnected the caster of the further modification of the kitchen chair shown in FIG. 3 along the axle shaft at the time of non-seating. It is a side view of the caster shown in FIG. It is sectional drawing which cut | disconnected the caster of the further modification of the kitchen chair shown in FIG. 3 along the axle shaft at the time of sitting. It is a side view of the caster shown in FIG. FIG. 17 is a perspective view of a wheel provided in the caster shown in FIGS. 13 to 16. FIG. 18 is a vertical sectional view including the center axis of the wheel shown in FIG. 17. It is sectional drawing which cut | disconnected the caster with which the kitchen chair concerning the 2nd Embodiment of this invention was equipped in the vertical direction along the axle shaft at the time of non-seating. It is a side view of the caster shown in FIG. FIG. 20 is a side view of the caster during the seating operation illustrated in FIG. 19. FIG. 20 is a cross-sectional view of the caster shown in FIG. 19 cut in the vertical direction along the axle when seated. It is a side view of the caster shown in FIG. FIG. 24 is a vertical sectional view including the center axis of the wheel shown in FIGS. 19 to 23. It is sectional drawing which cut | disconnected the caster with which the kitchen chair concerning the 3rd Embodiment of this invention was equipped in the vertical direction along the axle shaft at the time of non-seating. It is a side view of the caster shown in FIG. It is sectional drawing which cut | disconnected the caster with which the chair for kitchens concerning the 3rd Embodiment of this invention was equipped in the vertical direction along the axle shaft at the time of seating. It is a side view of the caster shown in FIG. It is a perspective view of the wheel with which the caster shown in FIG. 25 thru | or 28 was equipped. It is sectional drawing cut | disconnected in the perpendicular direction along the axle shaft at the time of non-sitting in the modification of the caster with which the kitchen chair concerning the 3rd Embodiment of this invention is equipped. It is a side view of the caster shown in FIG. It is sectional drawing cut | disconnected in the perpendicular direction along the axle shaft at the time of seating in the modification of the caster with which the kitchen chair concerning the 3rd Embodiment of this invention is equipped. It is a side view of the caster shown in FIG. It is a partially expanded view which shows the caster main body of FIG. 33, a stopper, and the periphery of an axle. It is sectional drawing which cut | disconnected the caster with which the kitchen chair concerning the 4th Embodiment of this invention was equipped with the vertical direction along the axle shaft at the time of non-seating. It is a side view of the caster shown in FIG. FIG. 37 is an enlarged view around the stopper shown in FIG. 36. It is the side view which showed the caster with which the kitchen chair concerning the 4th Embodiment of this invention is equipped during seating operation | movement. FIG. 39 is an enlarged view around the stopper shown in FIG. 38. It is sectional drawing which cut | disconnected the caster with which the kitchen chair concerning the 4th Embodiment of this invention was equipped along the axle shaft at the time of seating. It is a side view of the caster shown in FIG. FIG. 42 is an enlarged view around a stopper shown in FIG. 41. It is a modification of the 4th Embodiment of this invention. It is the figure which showed the bending angle of a seated person's thigh, the load concerning the seat surface of a kitchen chair, and the escape force of a chair. It is the figure which showed the change of the rotation inhibitory force from before a seating through a seating operation to after a seating. It is the evaluation comparison table which compared the invention which is a chair for kitchens concerning the embodiment of the present invention and its modification, the chair without a caster, the chair with a caster, and the chair provided with the caster always bad.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Kitchen chair 20 Seating part 21 Backrest part 30 Supporting part 40 Leg part 50 Footrest part 100,101,102,200,300,301,400 Caster 110,111,112,210,310,311,410 Caster main body 110a , 210a, 310a, 410a Slider accommodating portion 110b Upper end surface 113, 213, 313, 413 Axle through hole 114, 214 Rotating roller mounting portion 115, 215 Rotating roller 116 Stopper 117 Roller supporting portion 118 Roller 120, 220, 320, 420 Caster Attachment part 130,131,132,230,330,331,430 Wheel 135 Stopper receiving protrusion 136,138 Roller support part 137,139 Roller 235,335,336,435 Rotation suppression groove 235a, 33 a, 336a, 435a recess 235b, 335b, 336b, 435b projecting portions 140, 240, 340, 440 the axle 150,250,350,450 slider 160, 260, 360, 460 spring 315 and 415 stop 316 roller support member 317 rotating roller

Claims (12)

A kitchen chair having a seating surface, a leg connected to the seating surface, and a wheeled caster provided on the leg,
The caster includes a caster main body, a caster mounting portion that is attached to a leg of the kitchen chair, a slider that can slide in a predetermined amount along the caster main body in the direction of the caster mounting portion, and is attached to the slider via an axle. A wheel, a caster body, a rotation restraining portion that is attached to the wheel and selectively restrains the rotation of the wheel, and is interposed between the caster body and the slider, and the slider is separated from the caster mounting portion. An elastic member that biases in the direction of
The rotation suppressing portion includes a stopper receiving protrusion formed on the side surface of the wheel at a predetermined interval in the circumferential direction, and a convex stopper formed on the caster body.
When the seated person is not seated, the stopper receiving projection interferes with the stopper to prevent the wheel from rotating, and when the seated person sits, the stopper receiving projection does not interfere with the stopper. The rotation restraining force exerted on the wheel by the rotation restraining portion is gradually reduced by allowing the stopper to get over the stopper receiving projection during the seating operation of the seated person. A kitchen chair.   2. The kitchen chair according to claim 1, wherein the stopper receiving protrusion is formed to be fixed to the wheel, and the stopper includes a roller that can rotate in accordance with a rotation direction of the wheel.   2. The stopper receiving protrusion includes a roller that can rotate in accordance with a rotation direction of the wheel, and the stopper includes a convex body that is fixed to the caster body. The kitchen chair listed.   The said stopper receiving protrusion is composed of a roller that can rotate in accordance with the rotational direction of the wheel, and the stopper is also composed of a roller that can be rotated in accordance with the rotational direction of the wheel. Kitchen chairs. A kitchen chair having a seating surface, a leg connected to the seating surface, and a wheeled caster provided on the leg,
The caster includes a caster main body, a caster mounting portion that is attached to a leg of the kitchen chair, a slider that can slide in a predetermined amount along the caster main body in the direction of the caster mounting portion, and is attached to the slider via an axle. A wheel, a caster body, a rotation restraining portion that is attached to the wheel and selectively restrains the rotation of the wheel, and is interposed between the caster body and the slider, and the slider is separated from the caster mounting portion. An elastic member that biases in the direction of
The rotation suppression portion is a rotation suppression groove formed on a side surface of the wheel over the entire circumference in the circumferential direction, and an elastic body in which an uneven portion is continuously formed on a groove outer peripheral wall surface facing the axle of the rotation suppression groove. A rotation-suppressing groove formed on the caster body, and a convex stopper that selectively engages with the rotation-suppressing groove,
When the seated person is not seated, the stopper is fitted in the recess of the rotation restraining groove to prevent the wheel from rotating, and when the seated person is seated, the uneven part of the rotation restraining groove does not interfere with the stopper. The rotation suppression force that the rotation suppression unit exerts on the wheel gradually decreases by allowing the wheel to rotate and getting over the stopper while the convex portion of the rotation suppression groove is deformed during the seating operation of the seated person. A kitchen chair characterized by   The kitchen chair according to claim 5, wherein the stopper includes a roller that can rotate in accordance with a rotation direction of the wheel. A kitchen chair having a seating surface, a leg connected to the seating surface, and a wheeled caster provided on the leg,
The caster includes a caster main body, a caster mounting portion that is attached to a leg of the kitchen chair, a slider that can slide in a predetermined amount along the caster main body in the direction of the caster mounting portion, and is attached to the slider via an axle. A wheel, a caster body, a rotation restraining portion that is attached to the wheel and selectively restrains the rotation of the wheel, and is interposed between the caster body and the slider, and the slider is separated from the caster mounting portion. An elastic member that biases in the direction of
The rotation suppression groove is a rotation suppression groove formed on the side surface of the wheel over the entire circumference in the circumferential direction, and a rotation suppression groove in which uneven portions are continuously formed on a groove outer peripheral wall surface around the axle of the rotation suppression groove. And formed of a convex stopper that is formed on the caster body and selectively engages with the rotation suppression groove,
When the seated person is not seated, the stopper is fitted in the recess of the rotation restraining groove to prevent the wheel from rotating, and when the seated person is seated, the uneven part of the rotation restraining groove does not interfere with the stopper. The rotation restraining force exerted on the wheel by the rotation restraining portion is gradually reduced by making the wheel rotatable and the stopper overcoming the convex portion of the rotation restraining groove during the seating operation of the seated person. Kitchen chair to do.   The kitchen chair according to claim 7, wherein the stopper includes a roller that is rotatable in accordance with a rotation direction of the wheel. A kitchen chair having a seating surface, a leg connected to the seating surface, and a wheeled caster provided on the leg,
The caster includes a caster main body, a caster mounting portion that is attached to a leg of the kitchen chair, a slider that can slide in a predetermined amount along the caster main body in the direction of the caster mounting portion, and is attached to the slider via an axle. A wheel, a caster body, a rotation restraining portion that is attached to the wheel and selectively restrains the rotation of the wheel, and is interposed between the caster body and the slider, and the slider is separated from the caster mounting portion. An elastic member that biases in the direction of
The rotation suppression portion is a rotation suppression groove formed on the side surface of the wheel over the entire circumference in the circumferential direction. The rotation suppression groove has a concavo-convex portion formed continuously on the outer circumferential wall surface of the rotation suppression groove. A plate-shaped stopper formed on the main body, and having a circular arc in accordance with the formation direction of the rotation suppression groove and a portion of which is selectively engaged with the rotation suppression groove,
When the seated person is not seated, a part of the stopper is engaged with the recess of the rotation restraining groove in a deformed state to prevent the wheel from rotating, and when the seated person is seated, the uneven part of the rotation restraining groove is the stopper. The rotation restraining portion exerts an influence on the wheel by allowing the wheel to rotate without interfering with the wheel and overcoming the convex portion of the rotation restraining groove while recovering the deformed state of the stopper during the seating operation of the seated person. A kitchen chair characterized by a gradual decrease in rotation restraining force.   The rotation suppression force exerted on the wheel by the rotation suppression unit becomes a maximum value before the seated person sits on the seat surface, decreases during the seating operation, and becomes zero or the minimum value after sitting. The kitchen chair according to any one of claims 1 to 9.   11. The sum total of the urging | biasing force which the said elastic member acts on the said slider is substantially equal to or less than the total value which added the weight of the said chair to 196N, The any one of Claim 1 thru | or 10 characterized by the above-mentioned. Kitchen chair as described in. The kitchen chair according to any one of claims 1 to 11, wherein the height of the seating surface is about 600 mm.

Images