JP2007097749A - Dental treatment chair - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To make it possible for a seat to be lowered without reducing lowering speed when the weight of the seat is light, that is, when no person is seated thereon in the dental treatment chair which enables a seat part to be raised by using a hydraulic cylinder and to be lowered by its weight. <P>SOLUTION: The chair is provided with a cylinder 21 erected on the base part 20, a piston 22 moving up and down through the cylinder 21, and a seat part 10 mounted on the top part of the cylinder, and the seat part 10 is raised by applying pressure on the oil fluid in the cylinder 21, and is lowered by its weight. The chair has a sensor 70 for detecting the lowering speed of the seat part 10 and a drainage passage 40 for discharging an oil liquid from the cylinder 21, and the lowering speed is maintained as predetermined notwithstanding the load weight on the seat 10 by controlling the discharge of the oil fluid from the drainage passage 40 according to the signal by the sensor 70. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a dental treatment chair, more specifically, a dental treatment chair that rises due to the pressure of oil and descends due to its own weight. Even when it is light, the descent speed of the seat is set to a predetermined speed, and the descent speed at the time of trial operation at the time of manufacturing or repairing the chair is increased to facilitate the work.

  FIG. 2 is a main part configuration diagram for explaining an example of a dental treatment chair to which the present invention is applied. In the figure, 10 is a seat part of the dental treatment chair, and the seat part 10 is a bayonet. 11, a backrest 12, a contour seat 13, a legrest 14, a footrest 15, an elbow rest 16, and the like, and is attached to the base 20 so as to be movable up and down. Sit on the seat 13, fix the head to the cradle 11, and receive treatment with the elbow resting on the elbow rest 16. During the treatment, the surgeon moves the seat portion 10 up and down, tilts, tilts, etc., so that the patient can be treated easily.

  As shown schematically in FIG. 3, for example, a cylinder 21 is erected on the base portion 20, and, as is well known, a piston 22 is accommodated in the cylinder 21 so as to be movable up and down. The seat 10 is mounted on the piston shaft 23. A flow path 30 for press-fitting liquid into the cylinder 21 is communicated with the lower part of the cylinder 21, and the piston 22 is raised by press-fitting liquid into the cylinder 21 through the flow path 30, and as a result, The seat portion 10 is raised, and the seat portion 10 can be adjusted to a desired height. Therefore, the patient can be treated at a height that makes it easy to treat the patient.

  As described above, in a dental treatment chair in which a seat is moved up and down using a liquid (oil) pressure cylinder, conventionally, when the seat 10 is raised, the seat 10 is moved by press-fitting oil into the cylinder 21. The seat 10 is lowered, but when the seat 10 is lowered, it depends on the load (self-weight) of the seat 10, and during the dental treatment, the patient is on the seat 10, so the seat 10 The load was large, and therefore the seat 10 descended relatively smoothly, and there was no problem in dental treatment.

  However, when a test operation is performed at the time of production, repair, etc., there is no patient or the like on the seat portion 10, so the load on the seat portion 10 is small, and it takes time for the seat portion 10 to descend. It took a lot of time when performing a test operation at the time of repair or repair, and the working efficiency was poor and the usability was poor.

  The present invention has been made in view of the above circumstances, and is a dental treatment chair in which a seat is raised using a liquid (hydraulic) pressure cylinder and lowered by its own weight. Even when no person is sitting on the seat, the lowering speed of the seat is not reduced, in other words, when the patient is not sitting on the seat, it is lowered at a speed that is almost the same as when a person is sitting on the seat. The object of the present invention is to provide a dental treatment chair that can be made to operate.

  In order to solve the above problems, the invention of claim 1 has a cylinder erected on the base portion, a piston that moves up and down in the cylinder, and a seat portion that is attached to the upper portion of the piston. In a dental treatment chair in which pressure is applied to the oil in the cylinder to raise the seat, and the seat is lowered by its own weight, a sensor for detecting the lowering speed of the seat, and the cylinder A drainage flow path for draining the oil liquid inside, and controlling the drainage of the oil liquid from the drainage flow path according to the output signal of the sensor, regardless of the load of the seat This is characterized in that the descending speed of the seat portion is set to a predetermined speed.

  According to a second aspect of the present invention, in the first aspect of the invention, the drainage flow path has a flow rate adjustment valve, and the opening degree of the flow rate adjustment valve is controlled according to the output signal of the sensor. It is a feature.

  According to a third aspect of the present invention, in the first or second aspect of the present invention, a bypass flow path is provided in parallel with the drainage flow path, and the open / close valve provided in the bypass flow path is controlled to open / close by an output signal of the sensor. It is a feature that has been made to do.

  According to the present invention, in a dental treatment chair in which the seat is lowered by its own weight, even if the seat is light, that is, even if a patient is not sitting on the seat, the seat can be moved quickly (smoothly). Since it can be lowered, it is very easy and efficient to carry out work during test operation during production and repair.

  FIG. 1 is a schematic configuration diagram of an essential part for explaining an embodiment of a dental treatment chair according to the present invention. In the figure, 21 is a cylinder, 22 is a piston, and an upper part of the piston 22 is shown in FIG. As shown, a seat (schematically shown) 10 is attached, and the fluid in the fluid tank 50 is press-fitted into the cylinder 21 from the flow path 30 to raise the piston 22 and raise the seat 10. At the time of lowering, the oil liquid in the cylinder 21 is discharged into the oil liquid tank 50 through the drainage flow path 40 and the piston 22 (and hence the seat portion 10) is lowered.

  More specifically, the flow path 30 is provided with a pump 31, an on-off valve 32, a damper 33, etc., and the drainage flow path 40 is provided with an on-off valve 41, a flow rate adjusting valve 42, a damper 43, etc. When raising the seat 10, the valve 32 is opened, the pump 31 is driven, and the oil in the oil tank 50 is pressed into the cylinder 21 to raise the piston 22. When lowering the seat portion 10, the valve 41 is opened, so that the oil in the cylinder 21 is pushed by the weight of the seat portion 10, and the valve 41, the flow rate adjustment valve 42, the damper 43, etc. Then, the flow rate is adjusted (speed adjustment) by the flow rate valve 42 and returned to the oil tank 50.

  In FIG. 1, reference numeral 70 denotes a speed sensor added according to the present invention. The speed sensor 70 includes, for example, a light emitting / receiving sensor 71 fixed to the cylinder 21 on the base part 20 side, and the seat part on the seat part 10 side. 10 and a perforated plate 72 that moves up and down integrally. As is well known, the light emitting / receiving sensor 71 has a light emitting element on one leg 71a side and a light receiving element on the other leg 71b. The porous plate 72 is sandwiched between the light emitting side leg 71a and the light receiving side leg 71b, and provided on the porous plate 72 when the porous plate 72 moves up and down integrally with the seat portion 10. The moving speed of the seat portion 10 can be detected by counting the number per unit time that the formed holes 72c pass between the light emitting and receiving elements.

  The present invention includes the speed sensor 70 as described above. For example, the speed when the speed sensor 70 counts five times per second (assuming that five holes 72c of the perforated plate 72 have passed) is a normal speed. (Reference speed), if the actual descending speed is 4 counts per second, a signal to open the on-off valve 42 is sent to the on-off valve 42 to open the on-off valve 42, and the oil from the cylinder 21 Is increased, and the descending speed of the seat portion 10 is increased. In this way, even if the patient is light, such as an infant, the seat 10 can be lowered smoothly at a predetermined or desired speed, and dental treatment can be performed effectively.

  In the case of the illustrated example, the oil liquid discharge flow path from the cylinder 21 is only 40, but another second discharge flow path (bypass flow path) 80 is provided in parallel with the discharge flow path 40. A valve 81 is provided in the discharge channel (bypass channel 80). For example, when a person is not sitting on the seat 10, the valve 81 can be opened and rapidly lowered. In some cases, the descent does not necessarily have to be smooth, and a damper may or may not be provided in the flow path 80.

It is a principal part schematic block diagram for demonstrating one Example of the dental treatment chair by this invention. It is a whole schematic block diagram for demonstrating an example of the dental treatment chair with which this invention is applied. It is a principal part schematic block diagram for demonstrating an example of the up-and-down moving mechanism of the conventional dental treatment chair.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Seat part, 11 ... Antodai, 12 ... Backrest, 13 ... Contour seat, 14 ... Legrest, 15 ... Footrest, 16 ... Elbow rest, 20 ... Base part, 21 ... Cylinder, 22 ... Piston, 23 DESCRIPTION OF SYMBOLS ... Seat part support shaft, 30 ... Oil-liquid injection flow path, 31 ... Pump, 32 ... Valve, 32 ... Open / close valve, 33 ... Damper, 40 ... Oil-liquid discharge flow path, 41 ... Open / close valve, 42 ... Flow valve, 43 DESCRIPTION OF SYMBOLS ... Damper, 50 ... Oil tank, 70 ... Speed sensor, 71 ... Light emitting / receiving sensor, 71a ... Light emitting side leg, 71b ... Light receiving side leg, 72 ... Perforated plate, 72c ... Hole, 80 ... Bypass discharge flow path, 81 ... open / close valve.

Claims (3)

  A cylinder erected on the base, a piston that moves up and down in the cylinder, and a seat that is attached to an upper portion of the piston, and applies pressure to the oil in the cylinder to apply the seat A dental treatment chair that is lowered by its own weight, and has a sensor that detects a lowering speed of the seat and a drainage channel that discharges the oil in the cylinder. The discharge of the oil from the drainage flow path is controlled in accordance with the output signal of the sensor so that the lowering speed of the seat is set to a predetermined speed regardless of the load of the seat. Dental treatment chair characterized by.   The dental treatment chair according to claim 1, wherein the drainage flow path has a flow rate adjustment valve, and the opening degree of the flow rate adjustment valve is controlled according to an output signal of the sensor.   The bypass flow path is provided in parallel with the drainage flow path, and the on / off valve provided in the bypass flow path is controlled to open / close by an output signal of the sensor. Dental treatment chair.

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