JP3925022B2 - Chair - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a chair that lifts a footrest to a use posture and stores it in a non-use posture, and more specifically, safety when the footrest is stored in a non-use posture while having a mechanically simple configuration. This is related to the technology to increase
[0002]
[Prior art]
Conventionally, as shown in FIG. 6, a base portion 1 is provided with a seat portion 2, and a footrest 3 is swingably provided with respect to the seat portion 2 so as to be freely inserted and removed. In a chair configured to be able to be switched between a use posture and a non-use posture in which the footrest 3 is inserted with a drive telescopic unit 5 interposed therebetween, the footrest 3 is arranged according to the extension amount of the drive telescopic unit 5. It swings downward.
[0003]
[Problems to be solved by the invention]
By the way, in the configuration in which the footrest 3 descends and swings with the extension of the drive telescopic unit 5 in this way, for example, when a child enters the space below the seat portion 2 or there is something else. This causes a problem in safety and also damages the movable side link, the drive expansion / contraction unit, and the like.
[0004]
In preventing such a problem, for example, a current flowing in an electric motor that drives the drive expansion / contraction unit 5 is detected to electrically prevent the above problem.
[0005]
By the way, in such a structure, there existed a problem that an electrical structure became complicated and cost became high.
[0006]
The present invention has been made in view of such a problem, and provides a chair capable of enhancing safety when the footrest is stored in a non-use posture while having a mechanically simple configuration. Is an issue.
[0007]
[Means for Solving the Problems]
According to the first aspect, the base frame 1 is provided with the seat portion 2, and the footrest 3 is swingably provided with respect to the seat portion 2 so as to be freely inserted and removed, and is driven between the footrest 3 and the base frame 1. A chair configured to be able to be switched between a use posture and a non-use posture in which the footrest 3 is retracted with an expansion / contraction unit 5, and the footrest 3 can be freely rotated at a pivot fulcrum 4 in the seat portion 2. The buffer link 7 that pushes up the footrest 3 is pivotally connected around the fulcrum shaft 8 provided on the footrest 3 so as to be swingable. If a certain upward thrust force is applied to the footrest 3 that swings downward with the drive telescopic unit 5 interposed therebetween, the downward motion of the footrest 3 is stopped and the thrust force is released. constitutes a mechanical damping means 6 to continue the descent swing to the non-use position, the mounting foot pivot axis 8 of the buffer link 7 Characterized in that it is close to the pivot point 4 of the base 3.
[0008]
According to such a configuration, when the footrest 3 is stored, for example, when a child or another object enters the lower portion of the seat portion 2 and the footrest 3 receives a pushing force exceeding a certain level, the buffering means 6 Therefore, it is possible to prevent the footrest 3 from being further lowered and rotated, so that the safety can be improved, and the buffer means 6 is a mechanical means, which is compared with an electric means. It is easy to reduce the cost.
[0009]
Further, Oite to claim 1, which is characterized in that it is freely pivotally connected swinging about a fulcrum shaft 8 provided with foot rests 3 on the foot rests 3 and push up buffer link 7 It is. According to such a configuration, when the footrest 3 receives a pushing force exceeding a certain level when the footrest 3 is stored, the footrest 3 and the buffer link 7 on the drive telescopic unit 5 side are supported by the fulcrum shaft 8. The buffering means 6 can be constructed with a simple mechanical structure and cleanly in appearance.
[0010]
Furthermore, Oite to claim 1, the seat 2 foot rests 3 and freely pivotally connected pivoting at the pivot fulcrum 4, the buffer link 7 fulcrum shaft 8 rotation fulcrum 4 of the stand 3 feet of It is characterized by being close to. According to such a configuration, since the fulcrum shaft 8 of the buffer link 7 is close to the rotation fulcrum 4 of the footrest 3, the footrest is placed with a rotation amount substantially the same as the rotation amount of the buffer link 7. The table 3 can be rotated, the footrest 3 can be rotated with a large rotation angle with a small rotation amount of the buffer link 7, the rotation angle θ of the drive expansion / contraction unit 5 can be reduced, and the drive expansion / contraction The space for storing the unit 5 can be reduced.
[0011]
In this case, in the footrest 3 in the use posture, when securing the height H from the floor surface to about 170 mm or more, the pivot for connecting the drive telescopic unit 5 to the fulcrum shaft 8 and the buffer link 7 of the buffer link 7 is supported. It is preferable that the distance from the support connecting shaft 10 is 90 mm or less.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below. 1 is an explanatory view showing the operation of the buffer means, FIG. 2 is a side view showing the usage posture of the footrest, and FIG. 3 is a side view showing the non-use posture of the footrest.
[0013]
The chair A is provided with a seat 2 on a pipe base frame 1, and a footrest 3 is pivotally connected to a front end portion of the seat 2 so as to be pivotable around a pivot point 4. A drive telescopic unit 5 is interposed between the base frame 1 and the footrest 3 is configured to be switchable between a substantially horizontal use posture and a substantially vertical non-use posture.
[0014]
In the chair A having such a configuration, when the driving telescopic unit 5 is contracted and the footrest 3 is lowered and rotated, it is safe when, for example, a child or other object is in the lower portion of the seat portion 2. In the present invention, safety is achieved by avoiding the footrest 3 from descending. Details will be described below.
[0015]
The seat 2 is composed of a seat cushion 11 and a seat frame 12, the footrest 3 is composed of a footrest cushion 13 and a footrest frame 14, and the footrest frame 14 is pivoted to the seat frame 12. 4 is pivotally connected so as to be rotatable.
[0016]
The buffer link 7 is pivotally connected to a fulcrum shaft 8 provided on the footrest frame 14 so as to be swingable. A distal end portion of the drive expansion / contraction unit 5 is pivotally connected to the free end portion of the buffer link 7 by a pivot connection shaft 10. The other end of the drive telescopic unit 5 is pivotally connected to the seat frame 12 via a pin 20 and is fixed in position. Accordingly, the footrest frame 14 is pushed up at the tip end portion 7 a of the buffer link 7 by the extension of the drive expansion / contraction unit 5 to lift and rotate the footrest 3 around the rotation fulcrum 4.
[0017]
According to such a configuration, when the footrest 3 is retracted due to the contraction of the drive expansion / contraction unit 5, for example, a child or another object enters the lower portion of the seat portion 2, and the footrest 3 has a certain level of pushing force. When receiving, the buffer link 7 is pulled by the drive expansion / contraction unit 5 with respect to the footrest frame 14 and rotated around the fulcrum shaft 8 to allow the operation of the drive expansion / contraction unit 5. Since the footrest 3 remains in contact with the obstacle in the contracted state, the safety is improved. As described above, the configuration for buffering the downward rotation of the footrest 3 is collectively referred to as the buffer means 6, but this configuration can be changed. Thus, the buffer means 6 can be configured with a simple mechanical structure and a clean appearance.
[0018]
In this case, a winding spring 9 is wound around the fulcrum shaft 8 so that the buffer link 7 is urged to rotate toward the footrest frame 14, and the footrest 3 is obstructed when the footrest 3 is stored. The spring force is accumulated in the direction in which the winding spring 9 is wound when it receives a pushing force exceeding a certain level when it hits, and the downward rotation of the footrest 3 is performed when the obstacle is removed and when there is no obstacle. This is performed smoothly in combination with the weight of the footrest 3. The form in which the winding spring 9 is wound around the fulcrum shaft 8 can be variously changed.
[0019]
By the way, since the fulcrum shaft 8 of the buffer link 7 is brought close to the rotation fulcrum 4 of the footrest 3, the footrest 3 is rotated by a rotation amount substantially the same as the rotation amount of the buffer link 7. The footrest 3 can be rotated with a large rotation angle with a small rotation amount of the buffer link 7, the rotation angle θ of the drive expansion / contraction unit 5 can be small, and the space for storing the drive expansion / contraction unit 5 Can be made small, the thrust of the drive telescopic unit 5 can be made small, and the motor 15 can be miniaturized.
[0020]
In addition, the lower end portion 7a of the buffer link 7 pivotally connected to the footrest frame 14 by the fulcrum shaft 8 pushes the footrest 3 away from the rotation fulcrum 4, and thus the foot The mounting frame 14 is pushed up at a location away from the rotation fulcrum 4 so that the stroke of the drive expansion / contraction unit 5 can be reduced and the lifting load can be reduced.
[0021]
In this case, in the footrest 3 in the use posture, when securing the height H from the floor surface to about 170 mm or more, the pivot for connecting the drive telescopic unit 5 to the fulcrum shaft 8 and the buffer link 7 of the buffer link 7 is supported. It is preferable that the distance from the support connecting shaft 10 is 90 mm or less.
[0022]
4 and 5 show the drive telescopic unit 5, the worm shaft 17 is rotated by the rotation of the output shaft of the motor 15, the worm wheel 21 is rotated by the rotation of the worm shaft 17, and the feed screw shaft is rotated by the rotation of the worm wheel 21. 18 is rotated, and the feed screw shaft 18 is moved in and out of the fixed pipe 19. Such a configuration of the drive telescopic unit 5 can be changed.
[0023]
【The invention's effect】
According to another aspect of the present invention, the base frame is provided with a seat portion, and the footrest is swingably provided with respect to the seat portion so as to be freely inserted and removed, and a drive expansion / contraction unit is interposed between the footrest and the base frame. The chair can be switched between a use posture and a non-use posture in which the footrest is retracted , and the footrest is pivotally connected to the seat at a rotation fulcrum to push the footrest. The lifting link is pivotally connected around a fulcrum shaft provided on the footrest so as to swing, and the footrest swings downward with a drive telescopic unit interposed between the tip of the buffering link and the base frame. Constitutes a mechanical buffering means that stops the downward swinging of the footrest when the thrusting force exceeds a certain level, and continues the downward swinging to the non-use posture when the thrusting force is released , since the pivot axis of the buffer links are brought closer to the stand of the rotation fulcrum foot, footrests For example, when a child or other object enters the lower part of the seat and the footrest receives a pushing force exceeding a certain level, the cushioning means prevents the footrest from rotating further downward. Therefore, the safety can be improved, and the buffer means is a mechanical means, and has an advantage that the cost is easily reduced as compared with the electrical means.
[0024]
Further, Oite to claim 1, et whether you are about to swingably pivotally connected to pivot shafts provided with footrests in footrest to stand pushed up buffer link, footrest when the footrest storage When the platform receives a thrust force exceeding a certain level, the footrest and the buffering link on the side of the drive expansion / contraction unit swing around the fulcrum shaft to allow the operation of the drive expansion / contraction unit. With this configuration, there is an advantage that the buffer means can be configured with a clean appearance.
[0025]
Furthermore, Oite to claim 1, the seat of the stand foot rotatably and pivotally connected at the pivot fulcrum, or we have a fulcrum shaft of the buffer linked in close proximity to the stand of the rotation fulcrum foot, slow have in amount of rotation of the rotational amount substantially the same amount of shock link can rotate the stand legs, it is possible to rotate the stand foot with a large rotation angle with a small rotation amount of buffer link, drive There is an advantage that the rotation angle of the expansion / contraction unit can be reduced and the space for storing the drive expansion / contraction unit can be reduced.
[Brief description of the drawings]
FIG. 1 is an explanatory view showing the operation of a buffer means of the present invention.
FIG. 2 is a side view showing the usage posture of the footrest.
FIG. 3 is a side view showing a non-use posture of the footrest of the above.
FIG. 4 is a partially cutaway side view of the same drive extension unit.
FIGS. 5A and 5B show the drive extension / contraction unit, wherein FIG. 5A is a partially broken side view, FIG. 5B is a plan view, and FIG. 5C is a partially broken front view;
6A is a schematic side view of a non-use posture of a footrest, and FIG. 6B is a schematic side view of a use posture of a footrest.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Base frame 2 Seat part 3 Footrest 4 Rotation fulcrum 5 Drive expansion / contraction unit 6 Buffer means

Claims (2)

A base is provided on the base frame, and the footrest is swingably moved relative to the base so that it can be freely inserted and removed. A footrest base is used with a drive telescopic unit interposed between the footrest and the base frame. A chair configured to be switchable between a posture and a non-use posture for storing, wherein a footrest is pivotally connected to a seat at a pivotal fulcrum, and a buffer link for pushing up the footrest is placed on the foot. The footrest is pivotally connected around a fulcrum shaft provided on the base so that it can swing freely. When the lifting force is applied, it constitutes a mechanical shock absorber that stops the downward swing of the footrest and also continues the downward swing to the non-use posture when the thrust force is released. A chair characterized by being made close to the pivot point of the footrest . 2. The chair according to claim 1, wherein a distance between a fulcrum shaft of the buffer link and a pivot connecting shaft for pivotally connecting the drive expansion / contraction unit to the buffer link is 90 mm or less.

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