JPH09215550A - Chair - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a chair from turning over backward at the time of traveling the chair in two wheels in the case of moving the chair or the like by fitting casters to the lower ends of rear legs of the chair, and disposing stoppers in such a manner as to float the grounded surface a little from the floor surface. SOLUTION: In an ordinary working state, a chair is grounded on the floor surface F through the lower ends of casters 3 attached to the rear legs 2 and the lower ends 1a of the front legs 1, so that the chair is checked from oscillating forward and backward and from side to side. When a caring person grips a reclining backrest 6 or the like to tilt the chair backward about 10 deg. from the above stage, the lower ends 1a of the front legs 1 are floated from the floor surface F so that the load of the whole chair is supported only on the casters 3, and the chair is put in the state of being easily slid in the longitudinal direction by use of the casters 3. At this time, if the chair is tilted backward to excess, the grounded surfaces 7a of the stoppers 7 which are on standby in the rear of the casters 3 are grounded on the floor surface F so that the chairs can be inhibited from tilting backward more than that.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chair that is particularly suitable for elderly people, sick people, people with physical disabilities, and the like.

[0002]

2. Description of the Related Art As one type of chair, one having casters at the lower ends of legs is known. Since such a chair with casters slides on the floor surface with an extremely small resistance, it is extremely convenient when changing the posture or moving the chair, and is widely and commonly used in offices and homes. .

[0003]

By the way, it is important for a chair used by an elderly person, a sick person or the like to have a stable seated state during use. For this reason, if casters are attached to all of the legs, the slidability is too high and it tends to be unstable. In particular, when the chair is of the four-legged type instead of the leg-wing type, there is a possibility that the seated person may fall down simply by moving the center of gravity. On the other hand, in the position of a caregiver, casters are indispensable when bringing an old person or the like sitting on a chair close to a table or moving a place.

Therefore, in order to stabilize the seated state and secure the stool of the caregiver, it is considered as one means to provide casters on only one of the front leg or the rear leg. However, when the casters are attached to only one side, the form of moving the chair is two-wheel traveling. For this reason, it is indispensable to prevent the caregiver from falling while operating the caregiver and to consider the safety of the occupant while moving.

[0005]

In order to solve the above problems, the present invention provides a four-legged type chair only when casters and stoppers are provided on the rear legs and the chair is tilted backward more than necessary. The stopper is supposed to be grounded. And by adopting such casters and stoppers,
It is possible to prevent a fall to the rear during two-wheel traveling, and at the same time, effectively improve the stool of a caregiver and the sense of security of a seated person when traveling a long distance.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention is a chair comprising front legs and rear legs, in which casters are attached to the lower ends of the rear legs,
It is characterized in that a stopper is arranged at a position adjacent to the rear portion of the caster, with the ground contact surface slightly floating above the floor surface. In order to improve the usability when moving the chair, it is desirable to set the horizontal axis of the caster at a position that is offset forward from the center of the lower end of the rear leg.

With such a structure, the chair is
The caster attached to the rear leg and the lower end of the front leg can be stably grounded on the floor surface. Next, when the caregiver tilts the chair backward from this state, the lower end of the front leg floats above the floor surface, the entire load of the chair is supported by the casters of the rear leg, and the chair can easily slide in the front-back direction. It becomes a state. At this time, if the tilt exceeds a certain angle, the ground contact surface of the stopper waiting behind the casters of the rear legs will come into contact with the floor surface, and further tilting of the chair will be prohibited to ensure the fall. It will prevent it. And while being carried by a caregiver, etc. to the old people etc. seated in this chair,
The center of gravity can be stably supported by the seat and the backrest, and the user can take a relaxed and tilted posture. Therefore, compared to, for example, tilting the chair forward, it is possible to reduce the labor of the caregiver, especially when moving a long distance, and at the same time, provide a seated person with a mental and physical sense of stability. It is possible to raise it.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. The chair of this embodiment is, for example, a wooden chair, and as shown in FIGS. 1 to 3, the lower ends 1 of the left and right front legs 1 are
a is grounded directly to the floor surface F, and the lower ends 2a of the left and right rear legs 2 are grounded to the floor surface F via the caster mounting members 4.

The left and right front legs 1 and the rear legs 2 are assembled so as to stably support the load applied to the seat 5 and the backrest 6, and the lower end 1a of the front leg 1 is grounded to the floor surface F so that the seat 5 Is maintained in a substantially horizontal use posture, the lower end 2a of the rear leg 2 is set to a position slightly above the floor surface F as shown in FIGS. Then, the caster mounting member 4 having the casters 3 is attached to the lower ends 2a of the legs 2 thereafter.

The caster mounting member 4 has a block portion 4 attached to the rear leg 2 with its upper surface in close contact with the lower end 2a of the rear leg 2.
a and a caster shaft attachment portion 4b extending forward from the block portion 4a are integrally formed, and the caster 3 is attached to the caster shaft attachment portion 4b via a horizontal axis m. . That is, the horizontal axis m of the caster 3 is
As shown in FIG. 3, the lower end 3a of the caster 3 is set at a position that is displaced forward from the center P of the lower end 2a of the rear leg 2.
When the chair is in a normal use posture, a is grounded on the floor F together with the lower end 1a of the front leg 1.

In addition to the above construction, in this embodiment, the ground contact surface 7a is slightly floated from the floor surface F at the lower surface of the block portion 4a of the caster mounting member 4 and adjacent to the rear portion of the caster 3. The stopper 7 is attached in this state. Specifically, this stopper 7 is positioned substantially directly below the lower end 2a of the rear leg 2, and when the chair is in the normal use posture shown in FIGS. It is arranged so as to be inclined downward toward the front. When the chair rotates backward about 15 degrees with the lower end 3a of the caster 3 as a fulcrum, the ground contact surface 7a of the stopper 7 is set to contact the floor surface F as shown in FIG.

With such a structure, in the normal use state shown in FIGS. 1 to 3, the chair is placed through the lower end 3a of the caster 3 attached to the rear leg 2 and the lower end 1a of the front leg 1. Stablely ground to the floor surface F. That is, due to the friction between the lower end 1a of the front leg 1 and the floor surface F, the swinging of the chair in the front, rear, left and right is effectively suppressed. Next, when the caregiver turns to the back of the chair from this state and holds the backrest 6 and the like and tilts the chair backward by, for example, about 10 degrees, the lower end 1a of the front leg 1 is placed on the floor as shown in FIGS. 4 and 5. The chair floats from the surface F, and the load of the entire chair is supported only by the casters 3 of the rear legs 2, so that the chair can be easily slid back and forth using the casters 3. Therefore, it is possible for the caregiver to easily move the chair from room to room for a long distance while keeping this state. At this time, if the chair is tilted too far backward, the ground contact surface 7a of the stopper 7 standing by behind the caster 3 contacts the floor surface F as shown in FIG. Prohibit rearward leaning. For this reason, when the caregiver leans backward toward the chair in the use position, he or she tends to fall backward, or when the chair tilts too much for some time while moving for a long distance. The fall is surely prevented.

Therefore, when this chair is used in a nursing home or the like, compared with a type of chair in which casters are attached to all of the legs, the state of the elderly seated on the chair is remarkably stabilized and the daily life is greatly improved. It is possible to reduce physical and mental burdens in daily life. Moreover, compared to the case where casters are mounted on the front wheel side, the center of gravity of the elderly person should be kept at a lower level.
And the backrest 6 can be stably supported to take a relaxed posture, which can enhance the mental and physical stability especially when moving a long distance.
The caregiver's labor can be effectively reduced. Of course, when the chair suddenly turns when the chair is tilted backward, the stopper 7 contacts the floor surface F to prevent the chair from falling over, so that the caregiver can prevent an erroneous operation, and the safety in handling and the relief provided to the elderly and the like. The feeling can be further improved.

The specific structure and sectional shape of each part are as follows.
The present invention is not limited to the above embodiment. For example, in the above embodiment, the horizontal axis m of the caster 3 is set to the rear leg 2
Although it is set at a position deviated forward from the center portion P of the lower end 2a of the lower leg 2a, the horizontal axis n of the caster 103 is positioned substantially directly below the center portion Q of the lower end 102a of the rear leg 102 as shown in FIG. Alternatively, the stopper 107 may be positioned behind it. Even with this configuration, the chair can be easily moved in the normal tilted state shown in FIG. 8, and the stopper 107 can effectively function in the excessive tilted state shown in FIG. However, if configured as in the above-described embodiment, the lower end 3a of the caster 3, which is the center of rotation of the chair, comes closer to directly below the center of gravity of the entire chair, so that the caregiver can rotate the chair backward. Less power is required, and the usability of the caregiver can be more effectively improved within the range where stability during use is not impaired. Moreover, according to such a configuration, the caster attaching member 4 does not project rearward, so that it is possible to prevent a problem that the caregiver can take a foot at the same time. On the other hand, in the above-described embodiment, the stopper 7 is configured as a separate body from the caster mounting member 4, but by forming the stopper 107 together with the caster mounting member 104 into a resin as shown in FIGS. The number of parts and the number of production steps may be reduced.

Other configurations can be variously modified without departing from the spirit of the present invention.

[0016]

The present invention is embodied in the form described above and has the following effects. That is, the chair of the present invention is a four-legged type having front legs and rear legs, in which a caster is attached to the lower end of the rear leg, and when the chair is tilted backward to a position adjacent to the rear of the caster for a certain amount or more. A stopper that allows the grounding surface to be grounded to the floor surface is arranged. For this reason, in normal use, the casters of the rear legs and the front legs can be grounded on the floor surface to ensure a stable use state for the elderly, etc., and when moving the chair, tilt the chair backward. By supporting the load only on the casters of the rear legs, it becomes possible to effectively reduce the labor of the caregiver by utilizing the slidability of the casters. At that time, two wheels can be run even if the casters are attached only to the front legs, but by providing the casters on the rear legs, the operation from the back of the chair becomes easier, and the burden on the caregiver especially when moving long distances is increased. Not only is it remarkably reduced, but also for the elderly and the like, since the center of gravity can be stably supported by the seat and the backrest, the physical load is reduced and the sense of security is enhanced. In addition, if the chair leans backward too much, the stopper will come into contact with the floor surface, so that it is possible to prevent erroneous operation by the caregiver and to enhance safety in handling.

In addition to the above-mentioned structure, when the horizontal axis of the caster is set to a position deviated forward from the center of the lower end of the rear leg, the operating force required for the backward tilting motion of the chair is reduced. Therefore, it becomes possible to more effectively improve the usability of the caregiver within the range in which the stability during use is not impaired.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention.

FIG. 2 is a side view of the same.

FIG. 3 is an enlarged view showing a lower end of a rear leg of the embodiment.

FIG. 4 is a side view corresponding to FIG. 2 showing a state in which the chair is tilted rearward in the embodiment.

5 is an operation explanatory view corresponding to FIG. 3 showing a state of the lower end of the rear leg in the state of FIG. 4.

FIG. 6 is an operation explanatory view corresponding to FIG. 5 showing a state where the chair is further tilted backward from the states of FIGS. 4 and 5;

FIG. 7 is a diagram corresponding to FIG. 3 showing another embodiment of the present invention.

FIG. 8 is an operation explanatory view corresponding to FIG. 5 of the same embodiment.

FIG. 9 is an operation explanatory view corresponding to FIG. 6 of the same embodiment.

[Explanation of Codes] 1 ... Front leg 1a ... Lower end 2, 102 ... Rear leg 2a, 102a ... Lower end 3, 103 ... Caster 7, 107 ... Stopper 7a ... Ground plane F ... Floor surface m ... Horizontal axis P ... Bottom center part

Claims (2)

[Claims] 1. In a chair having front and rear legs, casters are attached to the lower ends of the rear legs, and stoppers are provided at a position adjacent to the rear of the casters, with the ground contact surface slightly above the floor surface. A chair characterized by being arranged. 2. The chair according to claim 1, wherein the horizontal axis of the caster is set at a position displaced to the front from the center of the lower end of the rear leg.