JPS6036784B2 - dental treatment chair - Google Patents

Description

[Detailed description of the invention] The present invention relates to a chair used for dental treatment and the like.

In general, a dental treatment chair has a mechanism to raise and lower the seat on which the patient sits, a function to tilt the seat away, and a function to raise the backrest, or backboard, so that an appropriate treatment posture can be obtained depending on the affected area. is required.

In order to meet these requirements, hydraulic cylinder systems have conventionally been incorporated between the relationally offset seat, the seat supporting the seat, and the back plate. This kind of hydraulic actuation mechanism has the advantage of quiet operation and smooth movement, but it requires two energy systems: a hydraulic system that handles pressure oil, and an electric circuit system that continues to operate this hydraulic system. In many cases, it required a system and was difficult to maintain and manage. In such conventional dental treatment chairs, if the hydraulic piping system is damaged, the seat, etc. may fall rapidly and cause harm to the patient. This has fatal drawbacks, such as leakage and staining treatment rooms that are normally kept clean. In order to solve the above-mentioned conventional drawbacks, the present invention requires only commercial electricity to be used.
To propose a dental treatment chair in which the seat, etc. will not fall even if it breaks down, and the treatment room will not be contaminated by leakage of pressure oil or the like. The details of the embodiment of the dental treatment chair according to the present invention shown in the drawings will be explained below.
FIG. 1 is an overall view of a dental treatment chair according to the present invention, with a portion cut away, and a hem placket 3 covered with a blindfold 2 is fixed on a base 1. .

The bases of a pair of parallel links 4, 5 extending rearward are supported by shafts 6, 7 on the hem bracket 3. Further, at the tip of each of the parallel links 4 and 5, a pedestal 9 that constitutes a parallel movement mechanism 8 together with the parallel links 4 and 5 and the mounting bracket 3 is supported by fulcrum shafts 10 and 11. A seat elevating mechanism A whose details are shown in FIGS. 2, 3 and 4 is provided between the base 1 and the link 4.

This seat elevating mechanism A includes a reversible electric motor 12 mounted on the base 1, and a worm 15 is rotatably mounted in a casing 13 of the reversible electric motor 12 by bearings 14a and 14b shown in FIG. Supported. The worm 15 is connected to the output shaft 12a of the reversible electric motor 12 by a coupling 16. Further, as shown in FIG. 4, a rotating shaft 18 protruding from the casing 13 is supported by bearings 13a and 19b in a direction perpendicular to the shaft 17 supporting the worm 15. A worm wheel 20 meshing with 15 is keyed. A driving sprocket 21 is fixed to the outer end of the rotating shaft 18.
The chain 22 is hooked onto a driven sprocket 24 that is integral with a driving bevel gear 23 that is rotatably supported on the shaft 6. A fork-shaped swing bracket 25 is supported on the shaft 6 so as to be swingable about the shaft 6.
The swing bracket 25 supports a feed screw 26 extending in a direction perpendicular to the scale 6, and a driven bevel gear 27 that meshes with the driving bevel gear 23 is fixed to one end of the feed screw 26. . 'Also, a nut 29 is screwed into the threaded portion 28 of the feed screw 26.' The nut 2 is preferably of the type known as a ball nut.
9 is a support cylinder 30 that receives the tip of the feed screw 26;
is fixed to the tip of the A base portion of the support tube 30 is swingably supported by a support shaft 31 at an intermediate portion of the link 4. Since the seat elevating mechanism A has the above structure, the rotational motion of the reversible electric motor 12 is transmitted to the drive bevel gear 23 via the worm 15, worm wheel 20, drive sprocket 21, chain 22, and driven sprocket 24. is,
The feed screw 26 is rotated by the drive side bevel gear 27.

Therefore, as the feed screw 26 rotates, the nut 29
The meshing position of the pupils changes, the parallel links 4 and 5 are raised and raised about the shafts 7 and 6, and the pedestal 9 is moved up and down while maintaining its horizontal orientation. In this case, since the feed screw 26 is supported by the swing bracket 25 that can swing around the shaft 6, the driven bevel gear 27 moves on the circumference around the shaft 6. Therefore, movement transmission to the feed screw 26 will not become inaccurate due to the tilting of the parallel links 4, 5. On the other hand, on the pedestal 9 whose upper surface is horizontal, there is provided a seat frame 32 which can be tilted about the fulcrum shaft 10 and constitutes a part of the seat.

The seat frame 32 includes a mounting bracket 33 that is rotatably fitted to the fulcrum shaft 101, and the entire seat frame 32 has a "
A bracket 34 is fixed to the center of the top of the pedestal 9, and the bracket 34 and a portion of the seat frame 32 near the front end are provided with details. A seat tilting mechanism B shown in Figures 2-5, 6, and 7 is embedded.The seat tilting mechanism B includes a reversible electric motor 35 shown in Figures 6 and 7 fitted within the seat frame 32. Casing 36 of reversible electric motor 36
A worm shaft 38 rotatably supported by bearings 37a and 37b is located inside. The output shaft 35a of the reversible electric motor 35 is removed from the worm shaft 38 by a coupling 39. A wheel shaft 42 supporting a worm wheel 41 that meshes with a worm 40 on the worm shaft 38 is supported by bearings 43a and 43b in a direction perpendicular to the worm shaft 38. A feed screw 45 is installed on the wheel shaft 42 and extends through a window 44 (shown in the fifth figure) of the seat frame 32. Further, a nut 46 is screwed into the feed screw 45.
6 is fixed to a support node 48 that is swingably supported by a support shaft 47 on the bracket 34 . The casing 36 of the reversible electric motor 36 is swingably supported by a pin 49a on a support placket 49 installed within the seat frame 32. Note that the upper surface of the seat frame 32 is covered with a cushion seat 32a. Since the seat tilting mechanism B has the above structure, the rotational motion of the reversible electric motor 35 is transmitted to the feed screw 45 via the worm 40 and the worm wheel 41, and
The fixing position of the nut 46 is changed by the rotation of the nut 46.

Therefore, by changing the overall length of the support tube 48 and the feed screw 45, the seat frame 32 is fanned out about the axis 10, and the seat frame 32 is tilted. In this case, since the base of the support tube 48 is swingably supported by the placket 34 and the casing 36 of the reversible electric motor 35 is swingably supported by the support bracket 49, the seat tilting mechanism B is not forced by the tilt of the seat frame 32. It will never occur. On the other hand, a pair of backboard support arms 50a and 50b facing each other in the width direction are installed in a portion near the rear end of the seat frame 32, and these backboard support arms 5
A back plate 51 is supported by shafts 52a and 52b at the tips of 0a and 50b. Further, a backboard tilting mechanism C for moving the backboard 51 is embedded in the rear part of the seat frame 32. This back plate raising mechanism C is equipped with a reversible electric motor 53 having exactly the same structure as the reversible electric motor 35, and this electric motor 53
is swingably supported by a support pin 53b of a support bracket 53a installed in the seat frame 32.
A nut 56 fixed to a support tube 56 that receives the tip of the feed screw 54 is screwed into the feed screw 54 which is rotationally driven by the reversible electric motor 53 . A bearing 57 is fixed to the rear part of the seat frame 32, and the base of a link 59 is fixed to the connecting bag 58' which is rotatably supported by the bearing 57. The base of the bottle is connected to the bottle so that it can be rolled over. A link arm 61 is attached to the other end of the connecting shaft 58.
The base of the is fixed. A fulcrum shaft 62 is fixed to the side of the back plate 51, and an operating lever 62 is attached to this fulcrum shaft 62.
3 is supported so that it can rotate around this fulcrum shaft 62. The other end of this operating lever 63 has the link
The tip of the arm 61 is supported by a pin 64. Since the back plate raising mechanism C has the above-described structure, the rotational movement of the reversible electric motor 53 is transmitted to the feed screw 54, and by changing the overall length of the feed screw 54 and the support tube 55, the link 59 rotates the connecting wisteria 58. The back plate 51 is therefore fixed to the shaft 58, since the link arm 61 displaces the free end of the actuating lever 63.
2a and 52b are the center of trouble. Since the dental treatment chair according to the present invention has the above-described structure, a worm gear device is interposed between the electric motors of the seat elevator side A, the seat forehead tilting mechanism B, and the back plate elevating mechanism C and each feed screw. Therefore, there is no risk of excessive reverse load being applied to the electric motor.

Then, when the feed screw is stopped due to the stop of the electric motor, the seat frame 32 and the back plate 5 are moved by the worm gear device.
1 is immediately stopped, there is no need to incorporate a mechanical braking device or the like into the drive system. After all, according to the present invention,
The structure of the drive device is relatively simple, and there is no fear that the floor surface or the like will be soiled due to oil spills, etc., unlike in the case of a follower.
In conventional dental treatment chairs, if the hydraulic line breaks, the seat frame etc. may fall rapidly and cause harm to the patient, but according to the present invention, even if the electrical system fails,
Since the seat frame etc. are kept stationary at the current position by the self-restraint action of the worm gear, there are advantages such as safety.

[Brief explanation of the drawing]

FIG. 1 is an overall perspective view of the dental treatment chair according to the invention, partially cut away, and FIG. 2 is an enlarged cross-sectional view of the main parts of the same treatment chair.
Figure 3 is a cross-sectional view of the exposed motor, Figure 4 is W-N in Figure 3.
5 is an enlarged perspective view of the main parts of the treatment chair, FIG. 6 is a sectional view of another electric motor, and FIG. 7 is a sectional view taken along the skin line of FIG. 6. . A... Seat lifting mechanism, B... Seat forehead tilting mechanism, C... Back board mechanism, 1... Base, 8...・Parallel motion mechanism, 9...Pedestal, 3
2... Seat frame, 12, 35, 53...
・Reversible electric motor, 26, 45, 54...Feed screw, 2
9, 46, 56...Natsuto. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7

Claims (1)

[Claims] 1. A dental clinic comprising a pedestal that is supported to be able to rise and fall freely relative to the base by a parallel motion mechanism, a seat that is supported to be tiltable relative to the pedestal, and a backboard that is supported to be able to rise and fall relative to the seat. A reversible electric motor with a worm gear mechanism installed on a base, a bevel gear device driven by the motor at a rotation axis position of the parallel motion mechanism, and one end coupled to the bevel gear device and the other end. a seat lifting mechanism consisting of a feed screw/nut device rotatably supported;
a seat tilting mechanism comprising a feed screw/nut device whose both ends are rotatably supported between the base and the seat, and a reversible electric motor with a worm gear mechanism connected to one end of the device to operate the device; A feed screw/nut device whose one end is rotatably supported by the member for raising and lowering the backboard and the other end by the seat, and a reversible electric motor with a worm gear mechanism connected to the one end to operate the same. A dental treatment chair comprising a back plate tilting mechanism.