JPS63305812A - Chair equipped with tiltable seat plate - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a chair with a tilting seat, and particularly to a chair that ensures smooth tilting of the seat.

(Prior Art) Various types of medical chairs and other chairs have been proposed, but some are equipped with a mechanism in which the seat plate tilts in conjunction with the raising and lowering of the back plate (so-called "tilt mechanism"). Proposed.

For example, the following have been proposed.

FIGS. 2(a) and 2(b) are both partially cutaway right side views showing such a conventional dental treatment chair, and FIG. (b) is a diagram showing a state in which the back plate is folded down.

This dental treatment chair includes a base 1 which has a built-in elevating mechanism that allows the entire chair to be raised and lowered downward by the driving force of a motor, hydraulic bomb, etc., and a base 1 that has a built-in elevating mechanism that raises and lowers the entire chair downward using a driving force such as a motor, a hydraulic bomb, etc.; There are a support base 3 attached to the seat plate 2 for supporting the seat plate 2, and a back plate 4 arranged at the rear of the seat plate 2 so as to be able to be raised and lowered.

Further, the side portion of the seat plate 2 is supported by a flange portion 3a formed at the rear end portion of the support base 3, and the support shaft 3b
It is pivoted so that it can rotate freely using the fulcrum.

Further, a sleeve piece 4a provided on the lower side of the back plate 4 and a bracket 2b fixed on the side of the seat plate 2 are rotatably connected by a support shaft 2c, and the back plate 4 is connected to the support shaft 2c. It is arranged to be able to be raised and lowered in the direction of arrow A about the shaft 2c.

Further, a first link piece 5 is provided, one end of which is pivotally connected to the lower side end of the back plate 4, and the other end of each link piece 5.6 is commonly pivotally connected to the shaft 7. There is. A roller 7a is provided at the end of the shaft 9, and this roller 7a is disposed so as to be movable on a pair of upper and lower guide strips 8 horizontally installed on the left and right sides of the upper part of the elevating body 1a. There is.

In addition, between the lower end of the back plate 4 and the elevating body la, there is a cylinder 9a and a movable rod 9b that expand and contract with pressurized fluid.
A telescopic actuating body 9 consisting of the following is provided, and both ends thereof are pivotally attached to a support shaft 10.11.

In the chair configured as described above, when the back plate 4 is now in the upright position as shown in FIG. as the first link piece 5 tilts counterclockwise.
is pushed forward.

As a result, the roller 7a rolls forward on the guide strip 8, and the second link piece 6 pushes up the seat plate 2 at the position of the shaft 2e while rotating counterclockwise. As a result, the same figure (
As shown in b), the seat plate 2 tilts forward and upward about the shaft 3b as a fulcrum.

In addition, returning the back plate of the chair from this state to the upright state (FIG. 2(a)) is achieved by extending the telescoping actuating body 9 and performing an action opposite to the above-mentioned action.

(Problems to be Solved by the Invention) However, in the conventional chair described above, when the seat plate is tilted, the flange portion 3a of the support base 3 and the support shaft 3b
Since excessive stress such as tensile force is applied to the parts, there are problems such as abrasion or twisting of the flange part 3a and the support shaft 3b, generation of noise such as squeaks, and smooth tilting of the seat plate cannot be ensured. There was a problem.

(Means for Solving the Problems) The present invention has been made in view of the above-mentioned points, and prevents excessive tensile force from being applied to the flange portion 3a and the support shaft 3b of the support base 3. To provide a chair equipped with a tilting seat plate that does not cause wear, twisting, squeaks, etc., and ensures smooth tilting operation of the seat plate.

That is, the present invention provides a chair including a support base and a tilting seat plate pivotally supported by the support base, which includes:
A long link piece having one end pivoted to the support stand or other fixed object and a roller being pivotally supported at the other end, and a link piece support that slidably supports the long link piece in the middle thereof. and a cam member, one end of the upper side of which is pivotally supported by the support base, a roller slidingly in contact with the back surface of the seat plate is pivotally supported at the other end of the upper side, and the cam member is connected to the support base. an eccentric cam member having a sliding surface on which the rollers of the link piece roll on the other end inclined downward from the shaft support, and the seat plate is moved by moving the link piece in the front and back direction. This is a chair equipped with a tilting seat plate, which is characterized by being tiltable.

(Function) Since the chair of the present invention is configured as described above, the eccentric cam member can be rotated by moving the long link piece back and forth, and the seat plate 2 can be pushed up substantially vertically by the roller 13d at one end. Stress such as excessive tensile force is not applied to the flange portion 3a and the support shaft 3b portion of the support base 3, so that the flange portion 3
No wear or twist occurs on the shaft 3a or the support shaft 3b.

(Example) Hereinafter, a dental chair, which is an example of a chair equipped with a tilting seat plate according to the present invention, will be described in detail based on the drawings.

Note that the same parts explained in FIG. 2 are designated by the same reference numerals.
The explanation will be omitted.

FIGS. 1(a) and 1(b) are both partially cutaway right side views showing a chair according to an embodiment of the present invention; FIG. FIG. 6 is a diagram showing a state in which the back plate is folded down.

The dental treatment chair according to the embodiment of the present invention is as shown in the figure, and includes a base 1 having a built-in elevating mechanism that raises and lowers the entire chair in the vertical direction by the driving force of a motor, a hydraulic pump, etc., and an elevating mechanism. A seat plate 2 is attached substantially horizontally to the upper part of the body 1a, a support stand 3 supports the seat plate 2, a back plate 4 is disposed at the rear of the seat plate 2 so that it can be raised and lowered, and one end is attached to the base plate 2. A long link piece 14 is pivotally attached to the lower end of the back plate 4 and has a roller 14a rotatably supported at the other end thereof, and a long link piece 14 is provided on the back side of the support base 3 and protrudes downward from the other end thereof. An elongated link piece support 15 consisting of an arm 15b on which a roller 15a is pivotally supported, and an eccentric cam member that makes the front part of the seat plate 2 tiltable in response to the movement of the link piece 14 in the front-rear direction. It consists of 13.

Further, an arm 16 is vertically disposed on the front back surface of the support base 3, and the distal end of the arm 16 supports one end of the cylinder 9a of the telescopic actuating body 9.

A vertical notch groove 1 is provided approximately at the front center of the support base 3 in the plane.
2 is provided, and one end of the eccentric cam member 13 is provided with a support shaft 13a at the inner rear end of the vertically long notched groove 12, as shown by the arrow B.
It is pivoted so that it can rotate freely in the direction. The eccentric cam member 13
is a triangular cam made of a thick metal plate formed into a substantially triangular shape, one end of the upper side of which is pivotally supported by the support base 3;
A roller 13d is pivotally supported at the other end of the upper side, and has another side that slopes downward from the support base 3.

A sliding surface 13c, on which a roller 14a rotatably supported by the tip of the long link piece 14 rolls, is formed on the above-mentioned side of the eccentric cam member 13 so as to curve inward. There is. Note that the curved shape of the sliding surface 13c is designed to be an appropriate shape in consideration of how the seat plate 2, which is linked to the raising and lowering of the back plate 4, is tilted over time.

Furthermore, an arm 15b is vertically disposed on the rear back surface of the support base 3, and a roller 15a is rotatably supported on the lower end of the arm 15b.
These arms 15b and rollers 15a constitute a link piece support 15.

The intermediate lower surface of the link 14 is slidably contacted and supported on the roller 15a.

Next, the operation of the dental treatment chair having the above configuration will be explained.

Now, when the back plate 4 is in the raised position as shown in FIG. 1(a), when the telescoping actuator 9 is shortened by pressurized fluid, the back plate 4 tilts counterclockwise about the shaft 2C as a fulcrum. At the same time, the long link piece 14 is pushed forward while sliding on the roller 15a at the lower end of the arm 15b.

As a result, the roller 14g is moved to the sliding surface 13c of the cam member 13.
The rollers 13d slide against the back surface of the seat plate 2, and without rolling, push up the cam member 13 counterclockwise using the support shaft 13a as a fulcrum. Push up clockwise.

As a result, the seat plate 2 tilts forward and upward about the shaft 3d as a fulcrum, as shown in FIG. 3(b).

In addition, when returning from this state to the state in which the back board of the chair is raised (FIG. 2(a)), the telescoping actuator 9 is extended,
The operation in reverse to the above may be performed.

(Effects of the Invention) As explained in detail above, the chair with the tilting seat plate according to the present invention is configured so that the seat plate can be easily tilted by combining the link piece and the eccentric cam member. Excessive stress will not be concentrated on the cylinder section and the support shaft section, and no wear or twist will occur in these sections.

Therefore, the seat plate can be tilted stably and smoothly, and the durability of the chair can be improved.

Furthermore, since the structure is simple and the number of parts can be further reduced, the manufacturing cost is advantageously low.

[Brief explanation of drawings]

FIGS. 1(a) and 1(b) are partially cutaway right side views showing a dental treatment chair according to an embodiment of the present invention; FIG. ) is a diagram showing a state in which the back plate is folded down. FIGS. 2(a) and 2(b) are partially cutaway right side views showing a conventional dental treatment chair; FIG. ) is a diagram showing a state in which the back plate is folded down.

Claims (2)

[Claims] (1) In a chair equipped with a support base and a tilting seat plate pivotally supported by the support base, one end of the seat plate is pivoted to the support base or other fixed object, and a roller is pivotally supported at the other end. a link piece support that slidably supports the elongated link piece at an intermediate portion thereof, and a cam member, one end of the upper side of which is pivotally supported on the support base, A roller that is in sliding contact with the back surface of the seat plate is pivotally supported at the other end of the upper side, and a roller of the link piece rolls on the other end that slopes downward from the shaft support with the support base. What is claimed is: 1. A chair with a tilting seat plate, characterized in that the seat plate is tilted by moving the link piece in a front-back direction, and an eccentric cam member having a surface formed thereon. (2) A tilting seat board according to claim 1, wherein the seat board is configured such that the seat board is tilted and returned in conjunction with the raising and lowering of the back board of the chair. Chair.