JPH0249656A - Medical chair - Google Patents

Abstract

PURPOSE: To provide a medical chair, which is easily manufactured with a low cost and is easily operated by making the backrest of the chair be controllable to be in at least three settings and when a setting comes lower than a horizontal plane, the backrest coincide with Trendelenburg's position. CONSTITUTION: A height controlling device of a seat 1, including a fluid operated cylinder 5, is connected to a base table part at one side and to a tetragonal link 6 at the other side and the same is installed inside the base table 3. The seat 1 has an angule αfrom a horizontal plane shown by a line drawn as X to X, and the seat declines downward toward a backrest 2, which is easily moved up and down as shown by arrow F1. The backrest 2 is connected by joints to the seat 1 so as to secure at least three basic positions, namely, an almost vertical, an almost horizontal and a declined downward positions from a horizontal plane. The backrest 2, especially, is controlled to be positioned within an arc of a specified circle shown by arrow F2 by a second fluid operated cylinder 8, so the backrest 2 is accurately controlled to be positioned at a prescribed position between a vertical limit position and a Trendelenburg's position which is under the horizontal plane.

Description

DETAILED DESCRIPTION OF THE INVENTION FIELD OF INDUSTRIAL APPLICATION The present invention relates generally to medical chairs, and in particular to dental chairs.

[Prior Art] In the technical field of medical instruments, especially dental instruments, chairs are used that can be adjusted to various desired postures in addition to the many postures adopted during normal treatment processes. , each of the above chairs is from Trendle Bark.
nburg) position, i.e. the position of the patient's feet is raised above the position of the patient's head, and a so-called reclining position can be adopted, which ensures smooth circulation of blood to the patient's head so that the brain is not starved of oxygen. .

Various current chairs are equipped with a function that can ensure a trendy lumberjack position consisting of a base, a seat held by the base, and a backrest that is indirectly connected to the seat. It has the basic adjustment functions of each of the above three members. The adjustment function of the seat is that it can be adjusted to a height that suits the height of the patient, and the adjustment function of the frontrest is that it can be adjusted to the height that suits the patient's body shape, and in dentistry, it can be adjusted to the height that suits the patient's head. Corresponding to the seat, it can be changed to the doctor's desired angle, and the adjustment function of both the seat and the backrest includes the ability to rotate and tilt it until it approximately corresponds to the trend-run-bark position.

Conventionally, the adjustment operations for the three members described above have been performed independently of each other. The various chairs are particularly for dental treatment and have the ability to easily manipulate the patient from a sitting position to a supine position when necessary during the treatment process. .

[Problems to be Solved by the Invention] However, most of the constituent members of the above-mentioned chairs, which are often operated independently, change the backrest to a reclining position, and the structure of conventional chairs is complicated. , and manufacturing costs are also high.

Furthermore, since the user must first confirm that the adjustment is correct, it is difficult to complete the adjustment quickly.

The present invention was made with attention to such problems,
To provide a chair that is easy to manufacture and operate and is inexpensive, having a function that allows the backrest to be reclined to a trend lumbering position.

[Means for Solving the Problem] In order to achieve the above object, a chair having a reclining function having the features described in the claims above includes a base part, a seat supported by the base part, The seat comprises a backrest that is indirectly connected to the seat, and the seat is tilted downwardly from the horizontal plane toward the frontrest and is adjustable in height. The front rest can be adjusted through at least three positions and corresponds to the trend lumbering position when in a position below the horizontal plane.

[Operation and Effects] The main advantage of the chair according to the invention appears as its ease of manufacture and operation.

[Embodiment] The chair of the present invention comprises a base part 3, a seat 1 supported by the base part, and a backrest 2 indirectly connected to the seat by a pivot 22.

The seat 1 is supported by the base 3 via a pair of parallelogram or quadrilateral links 6, and these links 6 are positioned on both sides of the base. The height adjustment means of the seat 1, including a fluid-actuated cylinder 5, are located inside the base part 3, connected to the base part on the -blade side and to a quadrilateral link 6 on the other side. The backrest 2 of the chair is integrally connected to a base 7 at its bottom end, and the base 7 is provided with a pivot portion 8a. This pivot portion 8a
One end of the second fluid actuating cylinder 8 is rotatably connected to the seat 1, and the other end is rotatably supported by a pivot portion 8b provided in the seat 1.

The seat 1 according to the invention has an inclination angle of α with respect to the horizontal plane indicated by the line X-X, and is inclined downward toward the backrest 2 of the chair, and its movement is indicated by the arrow F1. It can be easily raised and lowered. This means that the quadrilateral link 6 is configured such that when the seat 1 is moved up and down by the fluid-actuated cylinder 5, no rotation occurs in the vertical plane of the seat 1.

On the other hand, the backrest 2 is indirectly connected to the seat 1 in such a way that it can have at least three basic positions, the basic positions being approximately vertical, approximately horizontal, and finally a position inclined downward relative to the horizontal plane. be.

In particular, the backrest 2 is adjusted by manipulating the second fluid-actuated cylinder 8 within a constant arc indicated by the arrow F2, with the vertical limit position indicated by the solid line in FIG. 1 and the vertical limit indicated by the solid line in FIG. It can be precisely adjusted to a predetermined position between the trend run bark position below the horizontal plane.

In a preferred embodiment, the foot portion 7 and the fluid-operated cylinder 8 are configured such that, in the lower limit position, the backrest 2 maintains an inclination angle of α with respect to the horizontal plane. This inclination angle α
The backrest 2 is thus positioned in the same plane as the seat 1.

The angle of inclination α must be set such that the backrest 2 is inclined below the horizontal plane so that the patient's feet (or at least the knees) are higher than the height of the head. That is, this inclination angle α provides a lower limit position that coincides with the Totendornbark position.

The inclination of the seat 1 can be selected or changed by changing the angle of the support structure and/or by suitably adjusting the padding for the seat. For example, the thickness of the cushion member between the backrest 2 and the knees may be selectively increased.

The chair may also include a footrest 4 indirectly connected by a hinge 9 to the end of the seat 1 furthest from the backrest 2, and this footrest 4 can be adjusted at a desired angle relative to the seat 1. , can adopt a large number of stable positions. The angle of the footrest 4 can be adjusted steplessly or in stages (using a lifting function that allows the footrest 4 to be tightened and released), and the footrest 4 can be moved to the desired position via the hinge 9. can be selected.

According to such a chair, the sitting posture taken by the patient is such that the feet are lower than the knee height, but as mentioned above, if the backrest 2 is tilted downward from the horizontal plane, the patient's head is lower than the knee height. It is lower than the position of

The above chair is also extremely easy to implement and low cost.

Furthermore, while all important basic positions can be obtained, the number of cylinders to be manipulated is only two, and the attitude can be changed conveniently with one lever displaced in two mutually orthogonal directions. .

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of an embodiment of the chair, and FIG. 2 is a longitudinal sectional view thereof. l...seat, 2...backrest, 3...base Applicant's representative Patent attorney Takehiko Suzue

Claims (1)

[Claims] 1. A medical chair comprising at least one seat and a backrest, which are indirectly connected to each other and supported by a base, wherein the seat is arranged in a horizontal plane toward the backrest. It is tilted downwards and its height is adjustable only when in use, with the backrest in a normal trendlebark position, ranging from an almost upright position to a nearly horizontal position and even lower than the horizontal plane.
Trendelenburg) location. A medical chair, characterized in that it is indirectly coupled to the seat so as to ensure at least three reverse folding positions. 2. The chair of claim 1, wherein in the reverse folded position, the backrest is positioned generally flush with the seat forming a single reclining plane. 3. The chair according to claim 1, wherein the seat and backrest are padded, and the inclination angle of the seat with respect to a horizontal plane is determined or changed by selectively increasing or decreasing the thickness of the seat.