JP2004065952A - Chair backrest - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a chair backrest which is divided vertically in two and whose upper backrest (sub-backrest) can be inclined forward so that even the bent back of a patient can be supported and the chair can be suitably used for a long time of treatment. <P>SOLUTION: This chair backrest comprises a backrest 1 divided in two of a main backrest 12 and a sub-backrest 14 above the main backrest 12. The sub-backrest 14 can be inclined forward against the main backrest 12. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention is suitable for a chair, in particular, a dental chair, in which the backrest is divided into two parts, and the backrest is inclined forward toward the patient seated on the upper backrest, so that the elderly with a curved back. The present invention also relates to a backrest device for a chair, which is also suitable for:
[0002]
[Prior art]
The backrest of a conventional barber / beauty chair or dental chair is generally a single one, and has a configuration that allows it to fall down on a seat. Further, as some products, the backrest is divided into two parts in the vertical direction, and the upper backrest is raised or lowered depending on the sitting height of the seated person.
[0003]
[Problems to be solved by the invention]
By the way, in any of the above-mentioned backrests, when the back of an elderly person or the like is curved, for example, when a patient who is going to undergo dental treatment sits on a chair, the back may come into contact with the backrest. However, there is a problem that if the treatment time is prolonged, a feeling of fatigue is felt and the treatment is not suitable for a long treatment.
[0004]
The present invention has been made to solve the above-described problem, and its object is to divide the backrest into two parts in the vertical direction and to make the upper backrest (sub-backrest) tilt forward. An object of the present invention is to provide a backrest device for a chair that is suitable for a long-time treatment because the patient can support the back even if the patient has a curved back.
[0005]
[Means for Solving the Problems]
The backrest device in the chair according to the present invention achieves the above object, and the means of claim 1 divides the backrest into a main backrest and a sub backrest above the main backrest, Further, the sub backrest is configured to be able to lean forward with respect to the main backrest.
[0006]
According to a second aspect of the present invention, in the first aspect of the present invention, the sub backrest is configured to be vertically movable with respect to the main backrest. A wing piece is formed integrally on both sides of the main backrest and is bent obliquely forward to enclose both arms of the subject.
[0007]
According to a fourth aspect of the present invention, in the first and second aspects, a pillow is mounted on the upper portion of the sub backrest, and the fifth aspect is the pillow in the fourth aspect. Are mounted via a mechanism for enabling angle adjustment with respect to the sub-backrest.
[0008]
The means of claim 6 divides the backrest into a main backrest and a sub-backrest located above the main backrest, and the sub-backrest is fixed to a back side of the main backrest. The sub backrest is moved up and down by an actuator, and is displaced to a position in which the sub backrest is inclined forward by an angle actuator attached to a tip of the lifting actuator.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, a first embodiment of a backrest device in a chair according to the present invention will be described with reference to the drawings.
Reference numeral 1 denotes a backrest substrate, and a lower portion includes a support portion 11a for rotatably mounting to a seat (not shown) and a mounting portion 11b for mounting an actuator such as a hydraulic cylinder for raising and lowering the seat. The formed arm 11 is integrally formed.
[0010]
On both sides of the central piece 12 of the backrest substrate 1, wing pieces 13 for integrally wrapping both arms of a seated patient are integrally formed, and a notch formed above the central piece 12 of the backrest substrate 1 A sub-backrest 14 is rotatably attached to the portion about a shaft 14a on the lower end side as a fulcrum. The front sides of the main backrest 12 and the wing pieces 13 are covered with one cushion material (not shown), and the front faces of the sub backrests 14 are also covered with a cushion material (not shown).
[0011]
Reference numeral 2 denotes an elevating actuator such as a hydraulic cylinder whose one end (cylinder side) is pivotally supported by the arm 11. Reference numeral 3 denotes a main backrest 12 by a slide guide 12b fixed to a support member 12a on the back surface of the main backrest 12. On the other hand, it is a backrest column movably supported up and down, and is pivotally supported by a pin 31 attached to the upper end (piston side) of the elevation actuator 2 at the upper end of the backrest column 3. The supporting member 12a can serve as a guide rail for the backrest support column 3.
[0012]
Therefore, when hydraulic pressure is supplied to the lifting actuator 2, the backrest support column 3 supported by the piston of the lifting actuator 2 is guided by the slide guide 12 b and rises, and when the hydraulic pressure is released. It descends due to the spring force of the spring and its own weight.
[0013]
Reference numeral 4 denotes an angle actuator such as a hydraulic cylinder having one end (cylinder side) supported by the pin 31, and the other end (piston side) supported by a bracket 14 b fixed to the back side of the sub backrest 14. Have been. Accordingly, when hydraulic pressure is supplied to the angle actuator 4, the sub backrest 14 is tilted forward about the shaft 14a.
[0014]
A pillow 5 is provided with a pillow fixing bracket 52 attached to a pillow substrate 51 extended to a lower end of the pillow 5, and the pillow fixing bracket 52 is attached to a shaft 14c formed at an upper end of the sub backrest 14. It is rotatably supported. A pin 53 is pivotally supported by the pillow fixing bracket 52, and a link 6 is interposed between both sides of the pin 53 and the pin 31 of the back support column 3.
[0015]
With this configuration, when the angle actuator 4 is extended, the sub backrest 14 is in a forwardly inclined state as described above. In this forwardly inclined state, the pin 53 of the pillow fixing bracket 52 is connected via the link 6. Is pulled downward, the pillow fixing bracket 51 is rotated clockwise about the axis 14c, and as a result, the pillow 5 maintains a vertical state with respect to the floor surface, and the sub backrest 14 tilts forward. Even so, the pillow 5 is maintained in a state parallel to the main backrest 12.
[0016]
Reference numeral 54 denotes a pillow rotating shaft connecting the pillow substrate 51 and the pillow 5, and the pillow 5 can be rotated with respect to the pillow substrate 51 by loosening the pillow rotating shaft 54. Can be changed.
[0017]
Next, the operation will be described based on the above configuration.
1 and 2 show a state before the patient is seated. The sub backrest 14 is in a lowered position and is in a state parallel to the main backrest 12 of the backrest 1. In this state, in the case of a patient whose back is curved, such as an elderly person, it is necessary to adjust the sub backrest 14 to the curved back of the patient, so oil is supplied to the angle actuator 4.
[0018]
Then, as described above, the bracket 14b pivotally supported by the piston moves in a direction in which it is pushed up. At this time, the sub backrest 14 is pivotally supported on the lower side by the shaft 14a. As shown in FIG. 3 and FIG. Therefore, the back of the patient, particularly, a portion close to the shoulder comes into contact with the sub backrest 14, and the entire back of the patient is supported by the main backrest 12 and the subbackrest 14 of the backrest 1, and therefore, Patients do not suffer long-term treatment.
[0019]
Further, even if the sub backrest 14 is in the forwardly inclined posture, the pillow 5 is pulled downward by the pin 53 of the pillow fixing bracket 52 via the link 6, so that the pillow fixing bracket 51 rotates about the shaft 14c as a fulcrum. As a result, the pillow 5 maintains the vertical state with respect to the floor surface, and the pillow 5 maintains the parallel state with respect to the main backrest 12 even if the sub backrest 14 tilts forward. The patient is also brought into a more stable state because it is also supported in contact with the pillow 5.
[0020]
Note that, depending on the curved state of the patient's back, the head may be separated from the pillow 5 in a state where the sub backrest 14 is tilted forward, and the pillow 5 may be moved in the medical treatment position, that is, when treating the upper teeth. Since it is necessary to displace the pillow 5 in the upright direction when treating the lower teeth, and in such a case, the pillow rotating shaft 54 is loosened to rotate the pillow 5 with respect to the pillow substrate 51 in such a case. By moving the pillow 5 to change the angle of the pillow 5 with respect to the sub backrest 14, the patient's head can be brought into contact with the pillow 5 to perform treatment in a more stable state.
[0021]
Also, since the sitting height of the patient varies from person to person, the sub-backrest 14 may not fit on the patient's back in the case of a patient with a high sitting height. Oil is supplied to the lifting actuator 2 to raise and lower the backrest 14. Then, the column 3 moves up and down and the sub-backrest 14 moves up and down due to the extension of the piston of the lifting / lowering actuator 2, so that the upper back of the patient is adjusted to contact the subbackrest 14, and the backrest 1 is adjusted. The main backrest 12 and the sub backrest 14 are fitted to the patient's back, or the treatment can be easily performed (see FIG. 5).
[0022]
Next, a second embodiment will be described with reference to FIGS. Note that the same reference numerals as those in the above-described embodiment denote the same members, and a description thereof will be omitted.
In this embodiment, the elevating actuator 2 and the angle actuator 4 connected to the upper end of the elevating actuator 2 are housed in the column 3 and are fixed to the column 3 by pins 31. Are linked. The upper end (piston side) of the angle actuator 4 is fixed to the lower part on the back side of the sub backrest 4 via a connection fitting 14c.
[0023]
Further, a guide plate 14d having an upper end curved forward (to the left in FIG. 7) is attached to the upper portion of the sub backrest 4 so as to be able to be inserted and removed and fixed by a fixing bracket 14e. Further, the projecting piece 14d ₁ is fixed to the distal end side rear surface of the guide plate 14d.
[0024]
A U-shaped back plate 55 having a transverse cross section is attached to the back of the pillow 5. One end of one end of the back plate 55 is pivotally supported by the back plate 55 on both sides of the back plate 55. The other end of the link 55a is rotatably supported on a shaft 54a extended from the pillow rotation shaft 54 (not shown) described in the first embodiment. One end of a second link 55b is fixed to the shaft 54a, and the other end is supported by a third link 55c, one end of which is supported by the back plate 55.
[0025]
In the embodiment configured as described above, when the hydraulic pressure is not supplied to the lifting actuator 2 and the angle actuator 4, as shown in FIGS. The pillow 5 is at a position lowered to the upper end of the sub backrest 14 while being accommodated in the cutout portion of the back substrate 1. Incidentally, the pillow 5 attached to the guide plate 14d, a relationship between the first link 55a which is attached to the projecting piece 14d ₁ of the guide plate 14d, a state of tilted slightly backwards.
[0026]
In this state, when hydraulic pressure is supplied to the angle actuator 4, the sub backrest 14 is tilted forward with the shaft 14a as a fulcrum via the connection fitting 14c as shown in FIGS. When the sub backrest 14 is tilted forward, so inclined forwardly mounted and have guide plates 14d to a fixed bracket 14e, pillow 5 attached to protrusion 14d ₁ of the guide plate 14d guide The pillow 5 is displaced forward with the forward inclination of the plate 14d, and in this state, the head receiving surface of the pillow 5 is perpendicular to the floor surface.
[0027]
In the state of FIGS. 6 and 7 described above, when the hydraulic pressure is supplied only to the lifting actuator 2, the sub-backrest 14 simply rises and can be adjusted to the height of the patient. .
[0028]
When the hydraulic pressure is supplied to the elevation actuator 2 and the hydraulic pressure is also supplied to the angle actuator 4, as shown in FIGS. 10 and 11, the sub backrest 14 is lifted up by the same action as described above. Since the patient is displaced forward, even if the patient is in a state where the height of the patient is right and the back is curved, the height position and the forward leaning posture of the sub backrest 14 give the patient a long time. Treatment will not be painful.
[0029]
Note that, depending on the curved state of the patient's back, the head may be separated from the pillow 5 in a state where the sub backrest 14 is tilted forward, and the pillow 5 may be moved in the medical treatment position, that is, when treating the upper teeth. Since it is necessary to displace the pillow 5 in the upright direction when treating the lower teeth, and in such a case, by loosening the pillow rotating shaft 54 to make the shaft 54a free, The second link 55b fixed to the shaft 54a is rotatable, and the second link 54b is rotatable, so that the second link 54b is moved, for example, counterclockwise (in FIGS. 7, 9, and 11). , The third link 54c connected to the second link 54b is displaced in the direction in which the pillow 5 stands, so that the pillow 5 can be adjusted to the position of the patient's head. .
[0030]
In the first and second embodiments described above, the case of performing a treatment on a dental patient in the case of a dental chair has been described. However, it is needless to say that the present invention can be applied to other chairs, for example, a beauty and beauty chair. That is.
[0031]
【The invention's effect】
As described above, according to the present invention, the backrest is divided into the main backrest and the sub backrest above the main backrest, and the sub backrest can be tilted forward with respect to the main backrest. Even if a subject such as a patient whose back is curved such as an elderly person is seated, the entire back can be received by the backrest by tilting the sub backrest forward, and therefore, even in a long-time treatment. The subject does not feel tired.
[0032]
Further, since the sub backrest can be moved up and down with respect to the main backrest, the height of the entire backrest can be adjusted according to the sitting height of the subject. The back can be fitted.
[0033]
Also, by attaching the pillow to the sub backrest, the upper body of the subject can be received, so that the patient can receive the treatment in a relaxed state, and further, the angle between the pillow and the main backrest can be adjusted. By making it substantially constant, it is possible to sit naturally, and by attaching the pillow to the sub backrest via the pillow rotation axis, the pillow is angled with respect to the sub backrest and seated. The head of the subject can be more fitted, or can be displaced to the optimal medical care position.
[0034]
In addition, by forming integrally the wing pieces bent obliquely forward on both sides of the main backrest, both arms of the subject can be wrapped, and therefore, the back of the subject is curved. Even in such a case, there is an effect that the operation can be performed in a stable state.
[Brief description of the drawings]
FIG. 1 is a perspective view of a backrest device in a chair according to a first embodiment of the present invention as viewed from the back side.
FIG. 2 is a side view of the same.
FIG. 3 is a perspective view of a state where the sub backrest of FIG. 1 is tilted forward;
FIG. 4 is a side view of the same.
FIG. 5 is a side view showing a state where the sub backrest is tilted forward and raised.
FIG. 6 is a perspective view showing the second embodiment as viewed from the rear side.
FIG. 7 is a side view of the same.
FIG. 8 is a perspective view of a state where the sub backrest is tilted forward.
FIG. 9 is a side view of the same.
FIG. 10 is a perspective view of a state where the sub backrest is tilted forward and raised.
FIG. 11 is a side view of the same.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Backrest 12 Main backrest 14 Sub-backrest 2 Elevating actuator 3 Post 4 Angle actuator 5 Pillow 54 Pillow rotation shaft 6 Link

Claims (6)

A backrest in a chair, wherein the backrest is divided into a main backrest and a sub-backrest above the main backrest, and the sub-backrest can be tilted forward with respect to the main backrest. apparatus. The backrest device for a chair according to claim 1, wherein the sub backrest is movable vertically with respect to the main backrest. 2. The backrest device for a chair according to claim 1, wherein wings are formed integrally on both sides of the main backrest so as to bend obliquely forward and enclose both arms of the subject. 3. The backrest device for a chair according to claim 1, wherein a pillow is attached to an upper portion of the sub backrest. 5. The backrest device according to claim 4, wherein the pillow is attached to the sub-backrest via a mechanism for enabling an angle adjustment. The backrest is divided into a main backrest and a sub-backrest located above the main backrest, and the sub-backrest is moved up and down by a lifting / lowering actuator fixed to the back side of the main backrest, A backrest device, wherein the sub-backrest is displaced to a forwardly inclined position by an angle actuator attached to a tip of the lifting actuator.

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