JPH0220257B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present application relates to a dental treatment chair comprising a seat set on legs that can be raised up and down, and a backrest and a leg support that can be raised and lowered.

The applicant has previously proposed a dental treatment chair comprising a leg rest that extends forward from the lower leg rest to support the lower leg during sitting treatment with the patient in a nearly horizontal position (particularly According to this configuration, the treatment chair is changed from the horizontal position in the sitting treatment to the face-to-face treatment state in which the backrest and leg rests are placed in an upright position and the patient and doctor face each other. If, for some reason, the foot rest extending forward from the lower leg rest becomes unable to move during the transition process, the foot rest may come into contact with the floor as the lower limb rest moves in the standing direction. There was a risk of damage.

Therefore, the present application solves the above-mentioned inconveniences, and the embodiments of the present application will be described below in detail with reference to the drawings. Fig. 1 shows the entire dental treatment chair;
For example, the leg body is raised and lowered by a lifting mechanism 3 equipped with a belt pulley 2 rotated by a motor drive, and a seat 4 is installed horizontally at the upper end of the leg, and the upper surface is inclined forward on both sides of the seat 4. A pair of left and right side frames 5 are erected, and a backrest 6 is pivotably mounted between the upper rear ends of the side frames 5 via a pivot 7, and a front end of the seat 4 is A lower limb support part 8 is pivotally mounted via a pivot 9 so as to be freely up and down. An actuating portion a for raising and lowering the backrest portion 6 and the leg support portion 8 is provided on the lower surface of the seat 4, and the actuating portion a includes a pair of bearing members 10, 10 at the front and rear positions of the seat 4. A guide rod 11 is installed between the upper parts of the bearing members 10 and 10', and a threaded rod 12 is rotatably supported between the lower parts of the bearing members 10 and 10'. A belt pulley 13 rotated by an up-and-down operation motor (not shown) is pivotally attached to a protrusion protruding forward from the bearing member 10, and the upper part of the threaded rod 12 is slidably inserted into the guide rod 11. It is constructed by screwing together the lower part of the operating piece 14. Said screw rod 1
The other ends of curved lower limb receiving links 16, one end of which is pivotally connected to the lower surface of the lower limb receiving part 8, are respectively pivotally connected to the upper side of the actuating piece 14, which moves back and forth by the rotation of 2. The backrest part 6 and the leg rest part 8 are interlocked by the back and forth movement of the actuating piece 14, and when the back rest part 6 falls down from an upright state to a horizontal state, the leg rest part 8 falls down from a vertical state to a horizontal state. . 17 is the lower limb receiving part 8
When the lower limb resting part 8 lies down horizontally, the lower limb resting part 8 extends forward from the lower surface of the lower limb resting part 8, and when the lower limb resting part 8 stands up vertically, the lower limb A foot rest part that retracts to the lower surface of the leg rest part 8, and is formed from a plate slightly narrower than the width of the leg rest part 8. nut pieces 20 each screwed onto a long screw shaft 19 that is connected and supported by an attached slide motor 18 and extends forward;
A guide rod 22 is disposed which extends parallel to the screw shaft 19 at its left and right positions, and whose both ends are fixed to the front and rear ends of the footrest 17 via support pieces 21, respectively, and which prevent rotation of the screw shaft 19. As a result, the footrest portion 17 expands and contracts in the front-rear direction from the lower limb receiving portion 8. 23 is the pedestal 4
A bendable seat 24 provided continuously with the lower limb receiving portion 8 and the lower limb receiving portion 8 is a headrest. In addition, in the above, the motor for raising and lowering the lifting mechanism 3 and the motor for sliding 18 are driven simultaneously via a control circuit. Reference numeral A denotes a lifting/lowering stop mechanism for the dental treatment chair newly added in the present application, and the mechanism A is provided on the lower surface of the tip of the footrest 17 at the front edge of the footrest 17, as shown in FIG. a pressing lever 28 which is tiltably mounted via a butterfly plate 27 provided with a spring 26 so as to be received by a downwardly directed rib 25 and always maintain a vertical state, and whose lower end is curved rearward; Mounting piece 29 is placed so as to face the back of pressing lever 28.
The pressing lever 28 is installed via the spring 2.
6, the micro switch 30 is activated by being pressed by the pressing lever 28, and this micro switch 30 is connected to the drive circuit of the motor for raising and lowering the backrest 6 and the leg rest 8. has been done.

Therefore, when the seat 4 is lowered from the prone state of the chair in the seated treatment shown by the dashed line in FIG. Along with the operation of the receiving part 8 in the upright direction, the slide motor 1
8 operates and the footrest 17 is stored below the leg rest 8, but when the leg rest 8 moves in the standing direction, the footrest 17 is not stored due to a failure of the slide motor 18, etc. When the leg is extended from the leg rest 8, the lever 28 at the tip of the footrest 17
contacts the floor surface and tilts inward against the spring 26, thereby actuating the micro switch 30 and cutting off the chair control circuit including the drive circuit for the undulating motor. The movement of the lower limb receiver 8 in the lowering and standing directions stops.

Furthermore, in a non-treatment state in which the seat 4 is lowered, the backrest 6 is erected upward, and the leg support 8 is erected downward, the elevating mechanism 3 does not operate due to some kind of malfunction, and the slide Even when the motor 18 is activated, the microswitch 30 is activated via the lever 28 and the drive circuit for the slide motor 18 is cut off.

In the above embodiment, the actuating part a for raising and lowering the backrest part 6 and the leg rest part 8 was configured to move the actuating piece 14 back and forth by the rotation of the raising and lowering actuating motor, but the actuating piece 14 could be moved back and forth by using a hydraulic cylinder. Of course, it is also possible to have a structure in which it is moved back and forth.

As described above, according to the present application, if the footrest is not stored below the leg rest when the leg rest is operated in the standing direction due to some abnormality, the starting operation of the chair can be automatically stopped. It has the advantage of being safe to use.

[Brief explanation of drawings]

The drawings show an embodiment of the present application, and FIG. 1 is a partially cutaway side view of the entire body, and FIGS. 2A and 2B are partially enlarged side views of the footrest showing the stop mechanism. In the figure, 4 is the seat, 6 is the backrest, 8 is the leg rest, 1
7 is a footrest, 26 is a spring, 28 is a pressing lever, 3
0 is a micro switch, A is a undulating stop mechanism, and a is an undulating actuator.

Claims (1)

[Claims] 1 A lower leg holder is provided at the front end of the pedestal that can be raised and lowered,
This is configured so that it can be operated between a standing state and a prone state by an actuating part, and a footrest that moves in the front and back direction in conjunction with the standing operation of the leg rest is provided on the lower surface of the leg rest. a pressing lever that tilts against a spring when the front end of the footrest comes into contact with a floor surface or the like;
A dental treatment chair characterized in that it is equipped with a stop mechanism consisting of a switch that is activated by the tilting of the pressing lever and stops the operation of the operating section.