JP2008295788A - Height adjustable chair - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To facilitate dental treatments by a doctor under a standing posture, and at the same time, to facilitate the getting on/off of a patient to/from the chair. <P>SOLUTION: This height adjustable chair has a first piston shaft 51, a first cylinder 53, a second piston shaft 61, and a second cylinder 63. The first piston shaft 51 extends upward from a fixed base section 40, and has a first piston 52 on the upper end. The first cylinder 53 vertically moves while liquid-tightly engaging with the first piston 52. The second piston shaft 61 extends downward from a seat section 13, and has a second piston 62 on the lower end. The second cylinder 63 vertically moves while liquid-tightly engaging with the second piston 62. The first cylinder and the second cylinder are connected integrally in parallel. Thus, the height position of the seat section 13 is made adjustable by vertically moving the first and second cylinders by adjusting the amounts of a liquid being fed into the first cylinder and the second cylinder. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a chair in which the height of the seat can be adjusted, and more specifically, by effectively using two pistons and cylinders in combination, the height of the seat can be reduced by one cylinder length. The present invention relates to a dental treatment chair that can be adjusted over a long stroke from a low position of one minute to a high position of two cylinder lengths.

  FIG. 3 is a schematic perspective view of an essential part for explaining an example of a conventional dental treatment chair. As is well known, the dental treatment chair includes a head base 11, a backrest 12, and a contour seat (seat portion) 13. , Leg rest 14, leg rest 15, etc., and the seat portion 10 on which the backrest 12 can be raised and lowered with respect to the contour seat 13 is mounted, and the seat portion 10 is moved up and down and tilted. The movable base 20 includes a fixed base 30 that supports the movable base 20 so as to be movable, and a base member 40 on which the fixed base 30 is placed.

  In the dental treatment, the patient sits on the seat 13 and is fixed with his head fixed on the cradle 11 for treatment. At the time of dental treatment, the surgeon (doctor) moves the seating portion 10 up and down, tilts, tilts, etc. to make the patient easy to treat and treat. For example, when adjusting the occlusion of a tooth, the doctor sits in a state where the patient is seated and performs dental treatment by directly looking at the oral position of the patient. In such a case, it is easy to see the oral position of the patient. In order to do so, I would like to bring the position of the seat 13 as high as possible. In addition, we want to make the lowest position as low as possible for getting on and off the patient.

  As described above, in a dental treatment chair having an ascending / descending function, the relationship between the lowest position and the highest position of the chair (seat) is a problem. Ascending / descending functions include a method using electric motor as power and a method using oil pressure as power. The method using hydraulic power as a power source is (1) quieter sound when descending, (2) smooth operation, (3) simple electric circuit, etc. There are benefits. However, when the hydraulic cylinder is mounted vertically, if the stroke is taken long, the entire length of the cylinder becomes long and the lowest position of the chair becomes high. On the other hand, if the lowest position is lowered, the overall length of the cylinder is shortened and the stroke is shortened.

  The present invention has been made in view of the above circumstances, and the vertical movement of the seat portion in the dental treatment chair is effectively operated by two pistons and cylinders to increase the overall vertical movement stroke. It is possible to make the ascending position higher and lower the lowering position, thereby facilitating the dental treatment in the standing position of the doctor without increasing the size of the elevating device and to the patient's treatment chair. It was made for the purpose of facilitating getting on and off.

  In order to solve the above-mentioned problems, the invention of claim 1 is characterized in that a first piston shaft extending upward from a fixed base portion and having a first piston at an upper end, and a liquid-tight engagement with the first piston. The first cylinder that moves up and down, the second piston shaft that extends downward from the seat and has the second piston at the lower end, and the second piston that moves up and down by liquid-tightly engaging the second piston. The first cylinder and the second cylinder are connected in parallel and integrally, and the amount of liquid supplied into the first cylinder and the second cylinder is adjusted. Thus, the height position of the seat portion can be adjusted by moving the first and second cylinders up and down.

  According to a second aspect of the present invention, in the first aspect of the invention, the first cylinder and the second cylinder have substantially the same length and substantially the same movement stroke.

  According to a third aspect of the present invention, in the first or second aspect of the present invention, a three-way valve is provided in each flow path for supplying liquid to the first cylinder and the second cylinder. The two cylinders can be moved up and down simultaneously or individually.

  It is possible to lower the seat position when the patient gets on and off the treatment chair, so it is easier for the patient to get on and off the treatment chair, and the seat when the doctor is standing and treating Since the position (oral position of the patient's mouth) can be made higher, the doctor can perform treatment more easily (in a more comfortable posture).

  The vertical movement of the seat in the dental treatment chair is effectively actuated by two pistons and cylinders to increase the overall vertical movement stroke, so that the dentist can stand in a standing position without increasing the size of the lifting device. The treatment can be facilitated and the patient can easily get on and off the treatment chair.

  FIG. 1 is a main part configuration diagram for explaining the raising and lowering operation of the treatment chair according to the present invention. FIG. 1 (A) is a conceptual diagram when the seat 13 of the treatment chair is raised to the highest position, FIG. B) is a conceptual diagram when in the middle position, FIG. 1 (C) is a conceptual diagram when in the lowest position, and in the figure, 51 extends upward from the lower fixing portion (for example, the base portion 40). A first piston shaft is erected, and a first piston 52 is integrally provided at an upper end of the first piston shaft 51, and the first piston 52 is placed in the first cylinder 53. When the liquid is press-fitted into the first cylinder chamber 54, the first cylinder 53 moves upward and enters the state shown in FIG. 1 (A). On the other hand, the seat portion 13 is provided with a second piston shaft 61 extending downward from the seat portion 13, and a second piston 62 is integrally provided at the lower portion of the second piston shaft. The second piston 62 is liquid-tightly engaged in the second cylinder 63. The second cylinder 62 is integrally connected in parallel with the first cylinder 63. Therefore, when liquid is press-fitted into the second cylinder chamber 64 of the second cylinder 63, the second cylinder 62 is 2 piston 62 is pushed up, and the state shown in FIG. In this state, that is, in a state where the liquid is pressed into the first cylinder 53 and the second cylinder 63 to the maximum, the seat portion 13 is at the highest position.

  In the state shown in FIG. 1A, for example, when the liquid in the first cylinder 53 is decreased, the first cylinder 53 is lowered as shown in FIG. The second cylinder 63 integrated with the cylinder 53 is also lowered together, so that the seat portion 13 is lowered, and the seat portion 13 can be maintained at an intermediate height position. In this case, by adjusting the amount of liquid drawn out from the cylinder chamber 54 of the cylinder 53, the height of the seat portion 13 is set to the height position shown in FIG. 1A and the height shown in FIG. It can be adjusted to any height position between the height positions.

  Further, as shown in FIG. 1C, when the liquid in the cylinder chamber 64 of the second cylinder 63 is reduced, the second piston 62 is lowered, and thus the seat portion 13 is lowered and the seat portion is lowered. 13 can be set to the lowest position. Also in this case, the height position of the seat portion 13 is shown in FIG. 1B and the height position shown in FIG. 1C by adjusting the amount of liquid drawn out from the second cylinder chamber 64. It can be adjusted to any height position between different height positions. In the above, for the sake of simplicity, the example in which the second piston / cylinder is operated after the first piston / cylinder is operated has been described. However, the second piston / cylinder is operated. It will be readily appreciated that the first piston / cylinder may be actuated afterwards, and that both may be actuated simultaneously. Furthermore, although the example in which the length of the first cylinder 53 is equal to the length of the second cylinder 63 has been described, it is not necessarily required to have the same length.

  FIG. 2 is a diagram for explaining a configuration example of a liquid (hydraulic) circuit that operates the piston / cylinder shown in FIG. 1, in which 70 is a hydraulic motor, 80 is a first three-way solenoid valve, and 81 is a first , 90 is a second three-way solenoid valve, 91 is a second flow valve, and 100 is an oil discharge tank. As described above, the first and second three-way solenoid valves 80 and 90 are simultaneously opened. Thus, the first and second pistons and cylinders can be operated simultaneously, and either one can be selectively operated. At that time, by changing the operating speeds of the respective pistons and cylinders by the flow valves 81 and 91, the speed at which the seat 13 is raised and lowered can be changed variously, and the seat surface can be easily adjusted in height. In addition, vibrations at start and stop can be reduced. Although there is a method that uses a servo valve in the flow rate control of the hydraulic circuit, according to the present invention, when using a three-way valve, the speed can be adjusted more finely when ascending / descending than when using a servo valve. Absent. However, there are advantages such as (1) no complicated electronic control is required and (2) a valve to be used is inexpensive and available. In addition, although the example which used the three-way solenoid valve and the flow valve for liquid amount control was demonstrated above, these are only demonstrated the preferable example, This invention is limited to the thing of these illustration examples. It is not done.

It is a principal part block diagram for demonstrating the raising / lowering operation | movement of the treatment chair by this invention. It is a figure for demonstrating the structural example of the liquid (hydraulic pressure) circuit which act | operates the piston cylinder shown in FIG. It is a principal part schematic perspective view for demonstrating an example of the conventional dental treatment chair.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 ... Yasudadai, 12 ... Backrest, 13 ... Contour seat (seat part), 14 ... Legrest, 15 ... Legrest, 20 ... Moving base part, 30 ... Fixed base part, 40 ... Base member, 51 ... 1st piston shaft, 52 ... 1st piston, 53 ... 1st cylinder, 54 ... 1st cylinder chamber, 61 ... 2nd piston shaft, 62 ... 2nd piston, 63 ... 2nd cylinder 64 ... second cylinder chamber, 70 ... hydraulic motor, 80 ... first three-way solenoid valve, 81 ... first flow valve, 90 ... second three-way solenoid valve, 91 ... second flow valve, 100: Oil drain tank.

Claims (3)

  A first piston shaft extending upward from the fixed base portion and having a first piston at the upper end, a first cylinder that moves up and down by liquid-tight engagement with the first piston, and a lower portion from the seat portion A second piston shaft having a second piston at the lower end and a second cylinder that moves up and down in liquid-tight engagement with the second piston, and the first cylinder and the second cylinder The two cylinders are connected in parallel and integrally, and the first and second cylinders are moved up and down by adjusting the amount of liquid supplied into the first cylinder and the second cylinder. By doing so, the height position of the seat portion can be adjusted, and the height adjustable chair.   The height-adjustable chair according to claim 1, wherein the first cylinder and the second cylinder have substantially the same length and substantially the same moving stroke.   A three-way valve is provided in each flow path for supplying liquid to the first cylinder and the second cylinder, and the first cylinder and the second cylinder can be moved up and down simultaneously or individually. The chair with adjustable height according to claim 1 or 2.

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