JPS5834140B2 - dental chair - Google Patents

Description

[Detailed description of the invention] This invention relates to a dental chair.

Dental chairs are of a reclining type because many treatments are performed in a supine position.

By the way, in many conventional dental chairs, the backrest portion simply undulates, but when the backrest portion undulates, the rotation locus follows a circular arc.

Therefore, when treatment is performed in an upright position and the patient's backrest is reclined to begin treatment in a supine position, the patient's head position moves significantly backwards.

Therefore, there are problems such as having to bring various treatment instruments close to the patient's head, and treating doctors having to shift their seats accordingly.Furthermore, cabinets must be installed so that the backrest does not interfere with the ups and downs of the patient. This resulted in a considerable waste of space.

This invention was made in view of the above-mentioned circumstances, and its purpose is to cause the seat to slide back and forth in conjunction with the up-and-down operation of the backrest, and to raise the front of the seat when sliding forward. To provide a dental chair in which the relative positions of the recumbent chair and a doctor are always at the optimal treatment position.

EMBODIMENT OF THE INVENTION Hereinafter, one embodiment of the dental chair according to the present invention will be described in detail based on the drawings.

The reference numeral 1 in the figure is a backrest portion, and the lower portion of the backrest portion 1 is connected to a seat portion 3 via a hinge fitting 2.

This seat part 3 has a long seat 3a so that the patient's leg can be placed on the seat 3a.

Further, a seat frame 3b integrated with the hinge metal fitting 2 is attached to the lower surface of the seat portion 3, and two link bars 4, front and rear, are attached to the left and right sides (only one is shown in the figure) of the seat frame 3b.
, 5 are rotatably attached at their respective upper end rotation parts 4a, 5a.

In both of these link bars 4 and 5, the front link bar 5 is formed to be slightly longer than the rear link bar 4.

Further, both of these linkers 4 and 5 are rotatably attached to the sides of the seat base 6 at their respective lower end rotation parts 4b and 5b, so that the backrest part 1 and the seat part 3 can slide (
It is configured as a reclining type.

Lower end rotating portions 4b of these link bars 4, 5.

5b are set to be located at approximately the same height as the horizontal level, as shown in the figure.

Furthermore, the upper end rotating portion 4 of the link pars 4 and 5 located in the front and rear
The distance between a and 5a is as shown in the figure.
The distance is set slightly smaller than the distance between 5b and 5b.

Further, one end of an armrest 7 is rotatably attached to one side (left) of the backrest portion 10, and the other end of this armrest 7 is rotatably attached to the upper end of a fixed frame 8 erected on the seat 6. is connected to.

Further, between the seat frame 3b and the seat 6, a link bar rotation mechanism is provided in which the rond end is rotatably fixed to the seat frame 3b side, and the cylinder tail is rotatably fixed on the seat 6. A hydraulic cylinder 9 and a spring 10, which constitute the same, are arranged in parallel.

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

Treatment in an upright state is performed with the backrest portion 1 held at the solid line position.

In this state, the seat portion 3 is moved as far as possible to the rear (in the direction of arrow B), so that the patient's sitting posture becomes a very natural sitting position.

By the way, the rearward movement of the seat portion 3 is carried out by the extension of the rod of the hydraulic cylinder 9, whereby the front and rear linkers 4, 5 are rotated to the solid line position.

On the other hand, as the hydraulic cylinder 9 expands, the spring 10 disposed in parallel thereto is stretched, and always acts to return the cylinders 4 and 5 to the imaginary line state in the figure.

In conjunction with this rearward movement of the seat 3, the backrest 1 connected to the rear end of the seat 3 is guided by the armrest 7, which rotates around the upper end of the fixed frame 8, and moves to stand up. wake up

Now, when the backrest part 1 is brought down from the upright position to the imaginary line position to perform treatment while lying on one's back, the operation of lowering the backrest part 1 shortens the hydraulic cylinder 90 rod and causes the spring to contract accordingly. This is done using 10 effects.

The links 4 and 5, which had been pushed backward (in the direction of arrow B) by the iron of the hydraulic cylinder 9, are moved forward (in the direction of arrow A) by the compressive force of the spring 10 that acts as the hydraulic cylinder 9 is released from extension. ) and rotate to the virtual position.

Therefore, the seat portion 3 supported by both linkers 4.degree. 5 and the backrest portion connected thereto slide forward (in the direction of arrow A) as shown by the imaginary line while falling down.

By the way, for this slide, the seat part 3 is supported by a short link part 4 (rear support) and a long link part 5 (front part support), and the lower end rotating part 4b of each link part 4, 5 , 5b are provided at approximately the same height as the horizontal level, so the portion supported by the long link par 5 is pushed upward as it slides.

Therefore, the leading end of the sheet 3a is rotated upward as shown by arrow A' in the figure.

As mentioned above, the back and forth sliding movement of the seat part 3 and the raising and lowering movement of the backrest part 1 are linked to each other, and the link part 4
, 5, as the seat 3 slides back and forth,
The hinge metal fitting 2 draws a locus forming a part of an ellipse, and the backrest portion 1 rotates around the hinge metal fitting 2 and the upper end of the fixed frame 8.

Therefore, the dental chair of the present invention controls the link parts 4 and 5 and the link parts 4, 5, and This can be done smoothly by interlocking the armrests 7 which have the following functions.

Note that the mounting position of the hydraulic cylinder and spring as the link bar rotation mechanism is not limited to the above embodiment, and the hydraulic cylinder may be placed in a position where the seat 3 can be driven rearward with respect to the seat 6, or The spring connects the seat 3 to the seat 6
It may be provided at a position where it can be biased forward against the body.

Since this invention has the above-described structure and operation, the positional change with respect to the seat base due to the rotation of the backrest during the raising and lowering operation is reduced, and therefore the position of the patient's head when lying down is different from that of the conventional one. The chair is much closer to the front compared to other dental chairs.

Therefore, for example, a cabinet or the like placed behind the chair can be placed in the forward position, close to the doctor.

Furthermore, since the patient's head position is closer to the center of the chair, the movement and rotation distance of various treatment devices can be reduced, allowing the doctor to perform treatment operations extremely smoothly.

Moreover, when moving toward the patient's side, the seat slides back and forth according to the ups and downs and is tilted up and down at a predetermined angle. Since the patient moves upward as shown in FIG.

The up-and-down movement of the backrest, the back-and-forth sliding movement of the seat, and the up-and-down movement of the seat tip required for a folded dental chair can be smoothly performed in conjunction with each other by the rotation of the linker.

In addition, since the overall structure is simple, it can be provided at an extremely low cost, and has many excellent effects.

[Brief explanation of drawings]

The figure is a side view for explaining the main part configuration and operating state of the dental chair according to the present invention. 1...Backrest part, 2...Hinge fitting, 3... Seat part, 3a... Seat, 3b
...Seat frame, 4...Short link par
4a...Top rotating part, 4b...Lower end rotating part, 5...Long link par 5a...
...Top rotating part, 5b...Lower end rotating part, 6...
...Seat, 7...Armrest, 8...
Fixed frame, 9/curve, I) y-kuber rotation mechanism, 1
0...Spring.

Claims (1)

[Claims] 1. A reclining dental chair with a backrest that can be raised and lowered is equipped with long link bars that are rotatably attached to the lower ends of the seat on the left and right sides of the front of the seat. A short link bar is rotatably attached at each lower end rotating portion, and each of the link bars is rotatably attached at each upper end rotating portion to a seat disposed above the seat; and the positions of the lower end rotation parts of the long link bar and the short link bar located in the front and rear are set to substantially the same height as the horizontal level, and The distance between the short link bar and the upper end rotating portion is set to be less than or equal to the distance between the lower end rotating portion, and a backrest portion is connected to the rear end portion of the seat portion so as to be rotatable in the front-rear direction, and the A dental chair characterized in that a fixed frame erected on a seat base and an intermediate portion of one side of the backrest are rotatably connected by an armrest.