JPH08214984A - Chair - Google Patents

Abstract

PURPOSE: To provide a chair with improved maneuverability for the aged and the helper. CONSTITUTION: A front leg 1 and a rear leg 2 of this chair are in contact with the floor face F via adjusters 31 and 43. In a position in adjacency of the rear part of the adjuster 31 of the front leg 1, a caster 7 capable of grounding on the floor face F prior to the adjuster 31 selectively correspondingly to the adjusted position of the adjuster is installed.

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art As one type of chair, there is one having casters at the lower ends of its legs. Since such a chair with casters slides on the floor surface with extremely small resistance, it is extremely convenient when pulling the chair to sit, change the posture, move the chair, etc. It is widely and commonly used in offices and homes.

[0003]

By the way, as for chairs used in offices and the like, the type in which casters are attached to the lower ends of radially extending leg blades is increasing, whereas chairs used at home are Most of the traditional type has casters attached to the lower ends of the front and rear legs. In such a chair, it is easy to cause the chair to tilt in the front-rear direction based on the ground contact structure of the legs. Therefore, when the user moves the center of gravity in the seated state in the front-rear direction, after the front leg or the rear leg floats, the slidability of the casters causes damage and the center of gravity is directly above the front leg or the rear leg. There is a problem that the entire chair may suddenly turn to a position beyond the point, and that the chair and the user easily fall in the front-back direction. In particular, elderly people, sick people, people with disabilities, etc. can sit on a chair
Since there is a tendency to sit deeper or shallower than necessary on the chair, it is easy to apply a load to the position deviated from the center of the chair in the front-back direction, and the risk of the above-mentioned fall is much higher than that of a normal person. .

In order to avoid such a danger, it is conceivable to project a sled-shaped fall prevention member from the vicinity of the lower end of the front leg toward the front or from the vicinity of the lower end of the rear leg toward the rear. However, when such a configuration is adopted, it is dangerous for the user and caregiver to take a foot, and in addition, the fall prevention member collides with the heel of the user when the user pulls the chair. May be harmful.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a chair in which the risk of falling can be safely and effectively avoided without impairing the convenience of casters. .

[0006]

In order to achieve such an object, the present invention provides a chair, in which the front legs and the rear legs are grounded to the floor through the adjusters, at a position adjacent to the rear portion of the adjusters of the front legs. It is characterized in that a caster capable of being grounded selectively to the floor surface in preference to the adjuster in accordance with the adjuster adjustment position is attached.

[0007]

With this configuration, when the lower end of the adjuster for the front leg is raised to a position higher than the lower end of the caster, and the lower end of the adjuster for the rear leg is adjusted to the same height position as the lower end of the caster at that position, The chair is grounded on the floor via casters attached to the front legs and adjusters on the rear legs. Next, when the user applies a load to the position deviated from the center of the chair forward from this state, the frictional force between the lower end of the adjuster of the rear leg and the floor surface is reduced, and at least most of the load is applied to the front leg. Supported by the casters, the chair is ready to slide back and forth. At this time, the load deviation is large, and even if you try to induce more than necessary tilting,
The adjuster waiting in front of the casters of the front legs comes into contact with the floor to prevent further tilting of the chair forward,
It will surely prevent falls. This fall prevention angle can be adjusted by an adjuster. Also, since the rear legs of this chair are supported by the adjusters instead of the casters, the entire chair is supported against the load deviation to the rear of the chair until the center of gravity passes through the consideration point just above the rear legs. There is no fear of sudden rotation, and the risk of falls is much lower.

On the other hand, when the lower end of the adjuster of the front leg is hung to a position lower than the lower end of the caster, and the lower end of the adjuster of the rear leg is adjusted to the same height position as the lower end of the adjuster of the front leg at that position, the caster is lowered. Is lifted from the floor surface, and the chair is grounded to the floor surface via the front and rear adjusters, like a normal chair.

The above structure is useful for safety design because no special member for preventing falls is projected to the front of the front leg or the rear of the rear leg.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

The chair of this embodiment is, for example, made of wood, and the lower ends of the left and right front legs 1 and rear legs 2 are supported by adjusters 31 and 32, respectively, as shown in FIG.

The left and right front legs 1 and the left and right rear legs 2 are arranged at positions that can stably support the load applied to the seat 4 and the backrest 5, and are made of square wood. An insert nut (not shown) is embedded. And
Adjusters 31, 32 are screwed to these insert nuts so that they can be screwed forward and backward. Adjusters 31, 32
As shown in FIGS. 2 (A) and 2 (B), is a disk-shaped adjuster body 3a that can be grounded on the floor F, and a screw portion 3b protruding upward from the upper surface of the adjuster body 3a. The adjuster main body 3a also serves as a grip.

Further, this chair has an adjuster 3 of the front leg 1.
The caster 7 is attached to a position adjacent to the rear portion of the caster 1. The caster 7 is a channel material bracket 7a.
And a wheel 7c pivotally mounted on a lower end portion of the bracket 7a via a horizontal support shaft 7b. The vertical portion of the bracket 7a is stopped at a predetermined rear surface position of the front leg 1 by a screw 7d. I'm wearing it. Then, when the adjuster 31 of the front leg 1 is adjusted, the lower end 31a of the adjuster 31 is adjusted.
Can be selected from a position (see FIG. 3) retracted above the lower end 7e of the caster 7 and a position (see FIG. 5) in which the lower end 31a of the adjuster 31 hangs lower than the lower end 7e of the caster 7. I have to.

With this structure, the lower end 31a of the adjuster 31 of the front leg 1 is retracted above the lower end 7e of the caster 7, and the lower end 32a of the adjuster 32 of the rear leg 2 is the same as the lower end 7e of the caster 7 at that position. When the chair is adjusted to the height position, the chair has a lower end 7e of the caster 7 attached to the front leg 1 and an adjuster 32 of the rear leg 2 as shown in FIG.
To the floor surface F via the lower end 32a of Next, when the user shifts the center of gravity from this state and applies a load to the position deviated from the center of the chair to the front, the frictional force between the lower end 32a of the adjuster 32 of the rear leg 2 and the floor surface F. Or the adjuster 32 of the rear leg 2 is completely on the floor surface F.
Or at least most of the load is the front leg 1
Supported by the casters 7 of FIG. 4, the chair is in a state where it can easily slide in the front-rear direction, as shown by an imaginary line in FIG. Therefore, it is possible to extremely easily perform operations such as pulling the chair and changing the direction. At this time, if the load deviation is large and the chair tries to tilt more than necessary, as shown by the solid line in the figure, the adjuster 31 waiting in front of the caster 7 of the front leg 1 is on the floor. Touch F to prevent further forward tilting of the chair. Therefore, it is possible to reliably prevent the situation in which the user and the chair fall. The angle at which such a fall prevention effect occurs increases as the screwing amount of the adjuster 31 increases.
Further, since the rear legs 2 of the chair are supported by the adjusters 32 instead of the casters, even if the load on the back of the chair increases due to the user leaning on the backrest 5 significantly, There is no danger of the entire chair turning suddenly with the user until the center of gravity passes through the thought point right above the rear leg 2, so the risk of falling backwards is much lower. Can be set. Since the fall prevention function works without projecting a special member in front of the front leg 1 or behind the rear leg 2 as described above, the user is caught in the leg and falls, or the heel is injured. It is possible to surely prevent an unforeseen situation such as a situation.

On the other hand, as shown in FIG. 5, the lower end 31a of the adjuster 31 of the front leg 1 is hung to a position lower than the lower end 7e of the caster 7, and the lower end 32a of the adjuster 32 of the rear leg 2 is placed at that position. Lower end 31 of the adjuster 31
When adjusted to the same height position as a, the lower end 7e of the caster 7 floats above the floor surface F, and the chair is stably grounded to the floor surface F through the front and rear adjusters 31 and 32. Therefore, the chair can be used in the same manner as a normal chair with an adjuster.

As described above, compared with a chair in which all the legs are supported by the adjusters, the labor during use can be significantly reduced, and all the legs are supported by the casters. Compared with a chair, it is possible to reliably improve stability and safety during use.

The specific structure and sectional shape of each part are as follows.
The present invention is not limited to the embodiment described above, and various modifications can be made without departing from the spirit of the present invention. For example, although the present invention is applied to a wooden chair in the above-described embodiment, it is needless to say that the present invention can be applied to a steel chair.

[0018]

As described above, the chair of the present invention has the following features.
By adjusting the adjusters of the front legs and grounding the casters attached to the front legs and the adjusters of the rear legs to the ground,
It is possible to favorably achieve both a certain degree of slidability in the front-rear direction and a fall prevention function in the front-rear direction. Further, by adjusting the adjuster of the front leg and bringing the adjuster of the rear leg and the adjuster of the rear leg to contact the floor surface, it is possible to obtain a stable use condition just like a normal chair with an adjuster.

As described above, the chair according to the present invention has a small operating force, especially for the aged, sick, and physically handicapped, and is extremely convenient to be used with a sense of security. Also, it may be easy to operate.

[Brief description of drawings]

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

FIG. 2 is an enlarged perspective view of a main part of FIG.

FIG. 3 is a schematic side view showing one usage state of the same embodiment.

FIG. 4 is an operation explanatory view corresponding to FIG.

FIG. 5 is a side view corresponding to FIG. 3, showing another usage state of the embodiment.

[Explanation of symbols]

 1 ... front leg 2 ... rear leg 31 ... front adjuster 32 ... rear adjuster 7 ... caster F ... floor

Claims (1)

[Claims] 1. In a chair in which front and rear legs are grounded to the floor via an adjuster, the floor is selectively adjacent to the rear part of the adjuster of the front leg and selectively prioritized over the adjuster in accordance with the adjuster adjustment position. A chair characterized by attaching casters that can be grounded to the surface.