JP2004357778A - Rocking chair - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rocking chair constantly smoothly starting the rocking operation of a seat part. <P>SOLUTION: This rocking chair is provided with a motor storage case 20 fixed to a base member and an eccentric pin receiving member 36 to be attached to the bottom face of a seat body. The eccentric pin 22 is driven by a motor so as to revolve around the rotation central shaft 23 of the motor. The eccentric pin receiving member 36 is provided with a guide groove 37 extending long in the direction of diagonally crossing with the rocking direction for movably receiving the eccentric pin 22. The eccentric pin 22 is so set as to constantly stand still in a position other than the rocking-direction upper limit or lower limit position by a tensile force of a spring 25. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a rocking chair, and more particularly to a rocking chair in which a seat body is rocked by an electric motor. Note that the term “chair” as used in the present specification includes a chair that can be switched between a chair-like form and a bed-like form, and a bed-only form.
[0002]
[Prior art]
The same applicant as the present application has disclosed, in Japanese Patent Application Laid-Open No. 7-100040, a chair provided with a seat portion which can swing with respect to a base portion having legs. This chair is particularly suitable for sitting an infant, and when the mother or the like pushes or pulls the seat by hand, the swinging motion of the seat starts.
[0003]
Although not particularly specified in Japanese Patent Application Laid-Open No. 7-100040, it is possible to swing the seat by an electric motor. Specifically, a combination of an eccentric pin driven to revolve by an electric motor and a guide groove for receiving the eccentric pin enables the seat to swing. In this case, typically, the eccentric pin is provided on the base portion, and the guide groove is provided on the seat portion.
[0004]
[Patent Document 1]
Japanese Patent Application Laid-Open No. Hei 7-100040
[Problems to be solved by the invention]
In the case of a rocking chair provided with an electric motor as described above, the eccentric pin stops at an arbitrary position when the electric motor is stopped. If the eccentric pin that revolves around the rotation axis of the electric motor stops at a position corresponding to the top dead center or a position corresponding to the bottom dead center of the oscillating motion, the following problem occurs. The position corresponding to the top dead center and the position corresponding to the bottom dead center can be rephrased as the upper limit position and the lower limit position of the eccentric pin in the swing direction.
[0006]
Even in the case of a rocking chair with an electric motor, the rocking motion may be performed by moving the seat by hand. In this case, a person pushes or pulls the seat in the swing direction. When the eccentric pin is at the upper limit position or the lower limit position in the swing direction, the pressing force or the pulling force applied from the hand acts to bring the eccentric pin linearly closer to the rotation axis of the electric motor. Therefore, even if a pushing force or a pulling force is applied to the seat portion, the seat portion may be locked and may not move.
[0007]
When the eccentric pin is driven by the electric motor, the eccentric pin at the upper limit position and the lower limit position is moved in a direction orthogonal to the swinging direction. Locking of the seat is unlikely to occur.
[0008]
SUMMARY OF THE INVENTION An object of the present invention is to provide a rocking chair capable of always starting a rocking motion of a seat smoothly.
[0009]
[Means for Solving the Problems]
A rocking chair according to the present invention has a base member, a seat body swingably supported by the base member, a motor fixed to the base member, and a revolving motion about a rotation axis of the motor. And an eccentric pin driven by an electric motor, and an eccentric pin receiving member having a guide groove extending long in a direction intersecting the swing direction for operably receiving the eccentric pin. The guide groove of the eccentric pin receiving member does not intersect at right angles to the swinging direction but extends obliquely.
[0010]
According to the rocking chair having the above configuration, since the guide groove extends so as to obliquely intersect the rocking direction, even when the eccentric pin is at the upper limit position or the lower limit position in the rocking direction, the seat is The lock state is unlikely to occur. That is, when the seat body is pushed or pulled in the swinging direction by hand, the wall of the guide groove applies a pressing force obliquely to the eccentric pin (a direction not parallel to the swinging direction). It is easy to move the eccentric pin laterally from the upper limit position or the lower limit position.
[0011]
Preferably, the oscillating chair biases the eccentric pin to stop at a position other than the upper and lower positions in order to prevent the eccentric pin from stopping at the upper and lower positions in the swing direction. And an urging means for performing the operation. If the eccentric pin is always located at a position other than the upper or lower position, even if the seat body is pushed or pulled in the swing direction by hand, move the eccentric pin linearly toward the rotation axis of the motor. Since no such force is generated, the seat body is not locked.
[0012]
In one embodiment, the urging means is an elastic means for elastically connecting the eccentric pin and the base member. Examples of the elastic means include a spring and rubber.
[0013]
In another embodiment, a rocking chair includes a base member, a seat body pivotally supported on the base member, a motor fixed to the base member, and a revolving motion about a rotation axis of the motor. An eccentric pin driven by an electric motor, an eccentric pin receiving member having a guide groove extending long in a direction intersecting with the swing direction for operably receiving the eccentric pin, and an eccentric pin having an upper limit of the swing direction. In order to prevent the eccentric pin from stopping at the position and the lower limit position, there is provided an urging means for urging the eccentric pin to stop at a position other than the upper and lower limit positions. In this embodiment, the guide groove of the eccentric pin receiving member does not necessarily need to extend so as to obliquely intersect the swing direction. Specifically, the guide groove may extend in a direction orthogonal to the swing direction. Even in this case, the eccentric pin is always stopped at a position other than the upper limit and the lower limit by the urging means, so that even if the seat body is moved by hand, the seat body is not locked.
[0014]
BEST MODE FOR CARRYING OUT THE INVENTION
1 to 9 show an embodiment of the present invention. Although the swinging chair shown is a chair for infants, the present invention is not limited to the chair for infants, and is applicable to a chair for adults.
[0015]
First, a basic configuration of the swingable chair 1 will be described with reference to FIG. The swingable chair 1 includes a base member 10 and a seat body 30 swingably supported by the base member 10. The swing direction of the seat body 30 is the front-back direction of the seat, that is, the direction indicated by the arrow A in FIG.
[0016]
The base member 10 includes a pair of columnar members 12 and a curved supporting member 13 fixed to each columnar member 12. Casters 11 are attached to both ends of each support member 13. In order to enable the height of the seat body 30 to be adjusted, each columnar member 12 includes two bar-shaped members configured to be extendable and contractible.
[0017]
The seat body 30 includes a seat 31 and a backrest 32 that can be reclined with respect to the seat 31. The seat body 30 can be switched between a chair-like form and a bed-like form. FIG. 1 shows a bed-like configuration, in which the backrest 32 is tilted down to a substantially horizontal state.
[0018]
FIG. 2 shows a mechanism for supporting the seat portion 31 of the seat body 30 from below. This support mechanism connects a pair of swing links 33 and 34 having a U-shape, two connecting members 35 connecting between the pair of swing links 33 and 34, and connecting between two connecting members 35. And an eccentric pin receiving member 36.
[0019]
The upper ends of the pair of swing links 33 and 34 are rotatably supported by side plates (not shown) fixed to the pair of columnar members 12 of the base member 10. Since the seat body 30 is supported from below by the support mechanism illustrated in FIG. 2, the seat body 30 can swing with respect to the base member 10.
[0020]
The eccentric pin receiving member 36 has a guide groove 37 that extends long in a direction intersecting with the swing direction in order to operably receive an eccentric pin 22 described later. The guide groove 37 does not intersect at right angles to the swinging direction but extends obliquely.
[0021]
FIG. 3 shows a pair of columnar members 12 of the base member 10. A beam member 14 is fixed between the pair of columnar members 12, and a case 20 containing an electric motor is fixed to the beam member 14. On the upper surface of the case 20, a disk 21 that is rotationally driven by an electric motor and an eccentric pin 22 provided on the disk 21 appear.
[0022]
FIG. 4 is a perspective view showing a case 20 having a built-in motor, and FIG. 5 is a plan view thereof. As shown in the drawing, the eccentric pin 22 is located away from the rotation center axis 23 of the electric motor, and revolves around the rotation center axis 23.
[0023]
5, the swing direction of the seat body 30 is indicated by an arrow A. In the illustrated embodiment, in order to prevent the eccentric pin 22 from stopping at the upper limit position and the lower limit position in the swinging direction, the biasing device urges the eccentric pin 22 to stop at a position other than the upper and lower positions. Means. The biasing means includes a connection plate 24 and a spring 25.
[0024]
One end of the connection plate 24 is rotatably connected to the eccentric pin 22. One end 25 b of the spring 25 is connected to the other end of the connection plate 24, and the other end 25 a is connected to the upper surface of the case 20. In the illustrated embodiment, the eccentric pin 22 is always stopped at a position intermediate between the upper limit position and the lower limit position in the swing direction by the biasing force of the spring 25. A line connecting the stationary eccentric pin 22 and the rotation center axis 23 of the electric motor is substantially orthogonal to the swing direction.
[0025]
FIG. 6 shows a state where the eccentric pin 22 is near the lower limit position in the swing direction. Even if the eccentric pin 22 attempts to stop at the lower limit position in the swinging direction due to the stoppage of the motor, the disk 21 rotates counterclockwise in FIG. Stop at the position shown.
[0026]
FIG. 7 shows a state where the eccentric pin receiving member 36 is located on the case 20. As described above, the case 20 is fixed to the base member 10, and the eccentric pin receiving member 36 is attached to the bottom surface of the seat body 30.
[0027]
As shown in the drawing, the eccentric pin 22 revolving is located in the guide groove 37 of the eccentric pin receiving member 36. The guide groove 37 extends longer than the diameter of the disk 21 in a direction intersecting with the swing direction so as to guide the movement of the eccentric pin 22 revolving around the rotation center axis 23. . As shown, the guide groove 37 does not intersect at right angles to the swinging direction but extends obliquely.
[0028]
As is apparent from a comparison of FIGS. 7 to 9, the eccentric pin 22 is located in the guide groove 37 of the eccentric pin receiving member 36, so that the eccentric pin 22 rotates with the electric motor and revolves. The eccentric pin receiving member 36 and, consequently, the seat body 30 swing back and forth.
[0029]
When the motor is stopped, the eccentric pin 22 returns to the position shown in FIG. 7, that is, a position other than the upper and lower limits in the swing direction, and stands still by the pulling force of the spring 25. In this state, when a person pushes or pulls the seat body 30 in the swinging direction by hand, the eccentric pin 22 pushed by the wall of the guide groove 37 of the eccentric pin receiving member 36 starts the revolving motion smoothly. The swing motion of the main body 30 can be started smoothly. In this way, by always stopping the eccentric pin 22 at a position other than the upper and lower limits of the swinging direction, even when the seat body is moved in the swinging direction by hand, the eccentric pin 22 can be rotated by the rotation center axis of the electric motor. Since there is no force for linearly approaching the seat 23, the seat body is not locked.
[0030]
In the illustrated embodiment, the guide groove 37 of the eccentric pin receiving member 36 extends so as to obliquely intersect the swing direction. However, as another embodiment, the guide groove 37 is orthogonal to the swing direction. It may be made to extend in the direction of the movement. Even in this case, if the eccentric pin 22 is stopped at a position other than the upper and lower positions by the urging means such as the spring 25, the seat body 30 can be prevented from being locked.
[0031]
In still another embodiment, the biasing means such as the spring 25 may be omitted. In this case, the guide groove 37 of the eccentric pin receiving member 36 must extend so as to obliquely cross the swing direction. In this embodiment, since the urging means such as the spring 25 is not provided, when the motor is stopped, the eccentric pin 22 may stop at the upper limit position or the lower limit position in the swing direction. Even in this case, when a force to move the seat body with respect to the swinging direction by hand is applied, the wall of the guide groove 37 extending obliquely with respect to the swinging direction is inclined (oscillated) with respect to the eccentric pin 22. Since the pressing force is applied in a direction (not parallel to the moving direction), it is easy to move the eccentric pin 22 laterally from the upper limit position or the lower limit position to start the revolving motion. Therefore, also in this embodiment, the locked state of the seat hardly occurs.
[0032]
The embodiment of the present invention has been described with reference to the drawings. However, the present invention is not limited to the illustrated embodiment or the above-described embodiment. Various modifications and variations can be made to the illustrated or described embodiment within the same or equivalent range as the invention.
[Brief description of the drawings]
FIG. 1 is a side view showing an example of a rocking chair to which an embodiment of the present invention is applied.
FIG. 2 is a perspective view showing a mechanism for supporting a seat body from below.
FIG. 3 is a view showing a motor storage case attached to a base member and components related thereto.
FIG. 4 is a perspective view showing a case accommodating the electric motor and elements related thereto.
FIG. 5 is a plan view showing a case accommodating the electric motor and elements related thereto.
FIG. 6 is a plan view showing a state where the eccentric pin 22 is near a lower limit position in the swing direction.
FIG. 7 is a plan view showing a state where the eccentric pin is located in a guide groove of the eccentric pin receiving member.
FIG. 8 is a plan view showing a state in which an eccentric pin located in a guide groove is near a lower limit position in a swing direction.
FIG. 9 is a plan view showing a state in which an eccentric pin located in a guide groove is near an upper limit position in a swing direction.
[Explanation of symbols]
Reference Signs List 10 base member, 11 caster, 12 columnar member, 13 support member, 14 beam member, 20 case, 21 disk, 22 eccentric pin, 23 rotation center axis, 24 connection plate, 25 spring, 30 seat body, 31 seat, 32 backrest part, 33 swing link, 34 swing link, 35 connecting member, 36 eccentric pin receiving member, 37 guide groove.

Claims (4)

A base member,
A seat body swingably supported by the base member,
An electric motor fixed to the base member,
An eccentric pin driven by the motor to revolve about the rotation axis of the motor;
An eccentric pin receiving member having a guide groove extending long in a direction intersecting the swing direction to operably receive the eccentric pin,
The swinging chair, wherein the guide groove of the eccentric pin receiving member does not intersect at right angles to the swinging direction but extends obliquely. In order to prevent the eccentric pin from stopping at the upper limit position and the lower limit position in the swing direction, an urging means for urging the eccentric pin to stop at a position other than the upper and lower limit positions is further provided. The rocking chair according to claim 1, comprising: The rocking chair according to claim 2, wherein the urging means is an elastic means for elastically connecting the eccentric pin and the base member. A base member,
A seat body swingably supported by the base member,
An electric motor fixed to the base member,
An eccentric pin driven by the motor to revolve about the rotation axis of the motor;
An eccentric pin receiving member having a guide groove extending long in a direction intersecting the swing direction to operably receive the eccentric pin;
Urging means for urging the eccentric pin to stop at a position other than the upper and lower positions in order to prevent the eccentric pin from stopping at the upper and lower positions in the swing direction. Equipped swinging chair.

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