JPS6125470Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to the improvement of a dental treatment chair.
The backrest portion is made movable in the front-rear direction, thereby improving alignment between the patient and the backrest portion when the backrest is raised and lowered.

Generally, in a dental treatment chair, etc., when the backrest is reclined, the fulcrum shifts between the fulcrum of the patient's upper body and the fulcrum of the chair itself.
The alignment between the patient and the chair deteriorated, and the patient had to tilt his backrest and then shift his body to align himself with the chair.

The present invention was made to solve the above-mentioned inconveniences, and in particular, the contour seat part and the backrest part are connected via a link mechanism configured such that the fulcrum thereof is on the underside of the chair. The link mechanism is driven by a drive means to simultaneously raise and lower the backrest and move it in the front and rear directions, thereby preventing the back from slipping due to the tilting of the backrest and moving the center of rotation of the tilting to the bottom of the chair. This is intended to improve safety by placing it on the side.

1 and 2 are schematic configuration diagrams of essential parts for explaining one embodiment of a dental treatment chair according to the present invention. In the figures, 1 is a contour seat, 2 is a backrest, and 3 is a drive means (cylinder). ), 4 indicates a link mechanism, and FIG. 1 shows the state when the backrest is raised, and FIG. 2 shows the state when the backrest is down. The driving means 3 is
The fixed part 3a is rotatably attached to the lower part of the contour sheet 1, and the movable part 3b is rotatably fixed to the H point of the link mechanism 4.
As shown in the figure, when the movable member 3b extends and the backrest collapses, the movable member 3b
degenerates. A member 1a is provided at the rear of the contour seat 1 and extends downward from the contour seat, and a member 2a is provided at the bottom of the backrest 2 and extends from the rear of the backrest, and the member 1a is linked in the direction of extension. The member 2a has fixing points A and B for pivotally fixing the mechanism 4, and the member 2a has a fixing point CF for pivotally fixing the link mechanism 4 in its extension direction. The link mechanism 4 includes a first link 4a pivotally fixed to the point A, a second link 4b pivotally fixed to the point B,
a third link 4 pivotally fixed to the point C;
c, and a fourth pivotably fixed to the point F.
The first link 4a has an extension portion 4a' extending downward. The link mechanism 4 is pivotably fixed to the points A to C and F as described above, and the tip of the first link 4a and the tip of the fourth link 4d are pivotably fixed at the point G. and the second
The tip of the link 4b and the tip of the third link 4c are pivotally connected at a point E, and further, the first link 4a and the third link 4c are pivotally fixed at an intersection D. and the first
As described above, the tip of the extension 4a' of the link 4a is pivotally connected to the movable member 3a of the cylinder 3 at the point H, and the distance between the pivot connection points is =, = ,=,=
It is composed of Therefore, if the virtual intersection of the extended line with the current extended line is I, then when the cylinder 3 drives the H point of the link mechanism 4, the C point of the backrest 2 moves in an arc shape with the virtual point I as the center. The robot moves in a circular motion around point C, changing from the upright state shown in FIG. 1 to the inverted state shown in FIG. 2. That is, when the backrest is folded down, the backrest moves forward at the same time as the backrest moves forward to maintain alignment between the patient and the chair. However, according to the present invention, the backrest rotates around the virtual point I, so the fulcrum is set at the top of the chair. (If the center of rotation is placed above the contour seat, the rotating parts will come out and cause interference, and safety is also not good.) can be prevented.

[Brief explanation of the drawing]

1 and 2 are schematic configuration diagrams of essential parts for explaining one embodiment of the present invention. FIG. 1 is a diagram when the backrest is raised, and FIG. 2 is a diagram when the backrest is collapsed. 1...contour sheet, 2...butt crest,
3... Drive means (cylinder).

Claims (1)

[Scope of utility model registration request] a contour seat part, a backrest part that can be raised and folded relative to the contour seat part, a link mechanism that connects the rear part of the contour seat part and a lower part of the backrest part, and a fixed part side that rotates to the lower part of the contour seat part. A dental treatment chair that is movably mounted and has a drive means whose movable shaft side is connected to the link mechanism, and that moves the movable member of the drive means back and forth to raise and lower the backrest, wherein the link mechanism is , two points (point A, point B) on the first member 1a extending downward at the rear of the contour sheet, and an extending direction on the second member 2a extending rearward at the lower part of the backrest. The first link mechanism is rotatably fixed at two points (point C, point F) on the first member, and the link mechanism is rotatably fixed at two points (point C, point F) on the first member, which is closer to the contour sheet. a link 4a, a second link 4b pivotally fixed to a point B on the first member farther from the contour sheet, and a point C on the second member closer to the backrest. A third link 4c is pivotally fixed to a point F on the second member, and a fourth link 4d is pivotably fixed to a point F on the second member,
The tips of the first link 4a and the fourth link 4d are pivotally connected (point G), and the tips of the second link 4b and the third link 4c are pivotably connected (point G). point E), and the first link and the third link are pivotally connected at the intersection, and the first link 4a is connected downward between the point D and the point G. It has an extension part 4a' that extends, and the tip part (point H) of the extension part 4a'
is pivotally connected to the tip of the movable member of the driving means, and the length of each point is =
, =, =, = A dental treatment chair.