JP3222312B2 - Treatment chair - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a treatment chair, and more particularly to a treatment chair used in dental treatment and the like.

[0002]

2. Description of the Related Art In general, in a dental treatment chair or the like, when a backrest is tilted, the fulcrum generated between the upper body of the patient and the fulcrum of the chair itself deteriorates the consistency between the patient and the chair. After the patient has defeated the backrest,
I needed to shift my body to match the chair.

[0003] Fig. 3 is a schematic view of a main part for explaining an example of a conventional dental treatment chair. In the figure, 1 is a contour sheet, 2 is a chassis for the contour sheet 1, 3 is a backrest, and 4 is a backrest. Atodai, 5 is contour sheet 1 chassis 2
The moving block 6 is attached to the moving block 5
, A pulley 7 for rotating the screw bar 5, a connecting arm 8 for connecting the backrest 3 and the moving block 5, a rotating shaft 9 and a moving shaft 5. Is provided with a female screw that is screwed into the screw rod 6. Therefore, when the screw rod 6 is rotated, the block 5 moves in the direction of the arrow A, and accordingly, the backrest 3 rotates around the rotation shaft 9. To fall in the direction of arrow B. That is, when the block 5 is moved to the right, the backrest 3 is in a lying (sleeping) state, and when the block 5 is moved to the left, it is in an upright state. In the illustrated example, a pulley is used to rotate the screw rod 6, but any known means such as rotation through a gear mechanism may be used instead.

[0004]

In the prior art, when the backrest falls down, a doctor chair, a cabinet, a doctor's thigh, or the like is placed behind the backrest 3 or the abutment 4. Pinching, breaking these,
Alternatively, there has been a problem that the user is injured, and furthermore, it is pinched and cannot be removed. The present invention has been made in view of the above circumstances, and particularly when the backrest is down, when an obstacle is sandwiched on the back surface of the backrest, the backrest is stopped, and the backrest is moved. The purpose is to be able to manually return to a certain extent, or to automatically return the backrest by a predetermined amount, or to raise the contour sheet by a predetermined amount so that obstacles can be removed. It is.

[0005]

Means for Solving the Problems The present invention, in order to achieve the above object, a co centers seat, and backrest capable raisably respect to the contour seat, a movable block mounted on said contour seat A connecting arm for connecting the moving block and the backrest, and a treatment chair for transmitting the movement of the moving block to the backrest via the connecting arm to raise and lower the backrest, The connecting arm is loosely connected to the moving block, and detects displacement of the connecting arm when the connecting arm is displaced from a predetermined position when the backrest is tilted .
Has a displacement sensor that, when having a long hole in the connecting arm
Both have a shaft penetrating the elongated hole in the moving block,
In normal times, the shaft engages one end of the slot,
At this time, the connecting arm moves and moves to the other end of the slot.
The connecting arm and the moving block so that the shaft is engaged.
And the lock arm are loosely connected, and
A displacement sensor for detecting the movement, and a long hole of the connecting arm;
From the engagement with one end of the slot
In an intermediate position before changing to engagement with the other end,
The movement of the backrest is determined by the output signal of the displacement sensor.
It is characterized by being stopped .

[0006]

When a backrest falls down and an obstacle is sandwiched between the back side of the backrest and the floor, the backrest is stopped from falling and the backrest can be moved upward. Thus, the obstacle can be removed.

[0007]

FIG. 1 is a schematic side view of an essential part for explaining an embodiment of a treatment chair according to the present invention. In FIG. 1, parts having the same functions as those of the prior art shown in FIG. The same reference numerals as in the case of (1) are given. As described above, the backrest 3 is turned around the shaft 9 in the direction of arrow B by moving the moving block 5 in the direction of arrow A.
When there is an obstacle 10 such as a doctor chair, a cabinet, or a doctor's foot behind the backrest 3 when it falls down, these hit the back of the backrest 3 and move them to the back of the backrest and the floor. There was a danger of being pinched between the surface and breaking, or being pinched by the doctor's thigh and causing injury.

The present invention has been made in order to solve such a problem. In particular, when the backrest 3 falls down and hits the obstacle 10 as described above, the backrest falling operation is performed. Stop and allow the backrest 3 to be manually moved slightly upward, or automatically return the backrest by a predetermined amount, or
(The entire seat of the treatment chair) is raised by a predetermined amount.

FIG. 2 is an enlarged view showing details of the moving block 5 shown in FIG. 1. In the present invention, the moving block 5 and the connecting arm 8 are connected to a pin shaft 5a fixed to the moving block 5. It is connected by a long hole 8a provided at the end of the connecting arm 8, and is usually connected in a state shown by a solid line in FIG. That is, the pin shaft 5a and the long hole 8a
Due to the weight of the backrest 3, the connection arm 8 is connected to the rightmost position, that is, the left end of the elongated hole 8a is engaged with the pin shaft 5a. Therefore, at normal times, FIG.
In this manner, desired operations such as raising and lowering of the backrest and vertical movement of the contour sheet can be performed in exactly the same manner as in the prior art shown in FIG.

When the backrest falls down and the back surface of the backrest 3 hits the obstacle 10 or the like, the backrest 3 is temporarily stopped at that position by the action of the elongated hole 8a, and is connected during that time. The arm 8 moves to the position shown by the chain line in the direction of arrow C in FIG. 2, and the pin shaft 5a engages with the right end of the long hole 8a.

In FIG. 2, reference numeral 11 denotes a reflection type optical sensor which detects the position of the end face 8b of the connecting arm 8 by the optical sensor 11, and the end face 8b shows an abnormal state from a solid line position indicating a normal use state. When the change to the chain line position is detected, the tilting operation of the backrest 3 is stopped. At this time, if the tilting operation of the backrest 3 is stopped before the slot 8a reaches the chain line position, the backrest 3 can be manually returned to the starting direction by an amount corresponding to the remaining distance. , Can remove obstacles.

As described above, the backrest 3 is stopped before the right end of the elongated hole of the connecting arm is engaged with the shaft 5a, or is stopped by engaging with the shaft 5a. After stopping, if the backrest 3 is automatically returned to the starting direction by a predetermined amount or the contour sheet 1 is lifted upward, the obstacle 10 is not broken,
Even if the obstacle 10 is caught between the back surface of the backrest 3 and the floor, it can be easily removed. That is, the end face 8b of the connecting arms 8, the normal operation is in the solid line position, but are separated by a distance L ₁ from the light sensor 11, abnormality, i.e. the dashed line position when the backrest 3 hits the obstacle 10 move, thus leaving a distance L ₂ from the light sensor 11. This change in distance is detected by the optical sensor 11, and as described above, the tilting operation of the backrest 3 is stopped, and the backrest 3 is automatically returned to the starting direction by a predetermined amount, or the contour sheet is automatically moved by a predetermined amount. To raise. In the illustrated embodiment, an example has been described in which the movement of the connection arm 8 is detected by a reflection-type optical sensor. However, the present invention is not limited to the illustrated embodiment.
It can be easily understood that a detector other than the optical sensor may be used.

[0013]

As is apparent from the above description, according to the present invention, in a treatment chair for dental treatment or the like, when the backrest falls down, even if the back of the backrest hits an obstacle, the backrest is automatically turned on. Stop, and after stopping, you can manually release it slightly upwards, or return the backrest automatically, or raise the contour seat upwards, so that the backrest There is no worry that obstacles will be pinched and destroyed or become inaccessible.

[Brief description of the drawings]

FIG. 1 is a side view of an essential part for explaining an embodiment of a treatment chair according to the present invention.

FIG. 2 is a detailed enlarged view of a moving block unit shown in FIG.

FIG. 3 is a main part side view for explaining an example of a conventional treatment chair.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Contour seat, 2 ... Chassis, 3 ... Backrest, 4 ... Ahead stand, 5 ... Moving block, 6 ... Screw bar, 7 ...
Pulley, 8 ... connecting rod, 9 ... pin shaft, 10 ... obstacle,
11 ... Optical sensor.

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) A61G 15/00

Claims (1)

(57) [Claims] 1. A contour seat, comprising: a backrest which can be turned upside down with respect to the contour seat; a moving block attached to the contour seat; and a connecting arm which connects the moving block and the backrest. Then, in the treatment chair for transmitting the movement of the moving block to the backrest via the connecting arm to raise and lower the backrest, the connecting arm is loosely connected to the moving block, and the backrest is tilted. Detecting the displacement of the connecting arm when the connecting arm is displaced from a predetermined position .
Has a displacement sensor that, when having a long hole in the connecting arm
Both have a shaft penetrating the elongated hole in the moving block,
In normal times, the shaft engages one end of the slot,
At this time, the connecting arm moves and moves to the other end of the slot.
The connecting arm and the moving block so that the shaft is engaged.
And the lock arm are loosely connected, and
A displacement sensor for detecting the movement, and a long hole of the connecting arm;
From the engagement with one end of the slot
In an intermediate position before changing to engagement with the other end,
The movement of the backrest is determined by the output signal of the displacement sensor.
A treatment chair characterized by being stopped.