JPH0147184B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a dental light, and more particularly to a dental light whose light portion is automatically adjusted in position.

Conventional dental lights all have 1 to 3 stages.
It consists of a tiered arm, etc., and when changing from a standing position to a seated position (or vice versa), the light section attached to the end of the arm can be moved vertically or horizontally by hand to change the position.
The reality is that the direction was being adjusted.

According to the present invention, there is provided a dental light whose position is automatically adjusted according to the amount of inclination of the back frame of the treatment table so that the distance between the patient's oral cavity and the light section is always kept constant. provided.

The invention will be further explained with reference to the accompanying drawings:
In FIG. 1, there is shown a slide shaft support drive part 2 which is provided at the tip of a support stand, that is, a pole 1, and which is provided so as to be able to freely adjust its angle, a slide shaft 3 which is fitted into this, and a light part attached to the tip of the slide shaft support drive part 2. 4, its direction and position are first determined based on the patient's body shape and other factors prior to the examination.

Since the angle between the pole 1 and the slide shaft 3 is generally fixed in advance, the position of the light section can be changed by changing the amount of extension of the slide shaft 3 (in the direction of the arrow in the figure). Light part 4
The angle may be adjusted by connecting the slide shaft 3 with a ball joint 5, as will be described in detail later.

In this way, once the position of the light is set, the amount of backward movement of the oral cavity (indicated by the dotted line in the figure) can be detected, for example, even when changing from a standing position to a sitting position as shown in the example. By moving the slide shaft forward by a corresponding amount, the distance between the oral cavity and the light section can be kept constant. Note that the moving direction of the light section 4 as the slide shaft is extended is the extension line of movement of the oral cavity when the back frame is erected (or tilted) (considered to be a substantially straight line), as will be described later. It is preferable that the light portion substantially coincides with the direction of , so that the light portion is always in front of the oral cavity.

By the way, when changing from a standing position to a seated position, the back frame 6 is tilted to the position shown by the reference numeral 6', and the switch 7 provided on the side of the back frame 6 is actuated as shown in the illustrated example. Let's do it. Therefore, the slide shaft driving section is driven in conjunction with the switch, and the slide shaft is moved forward by an amount synchronized with the above-mentioned movement amount. In the illustrated example, the maximum tilt amount L of the back frame is approximately
Since the length is approximately 490 mm at 80 degrees, if the slide shaft is moved forward by the same distance, the distance between the light part and the oral cavity will be maintained constant. Note that the time required for tilting at this time is generally about 7 seconds.

Therefore, if the moving speed of the back frame when tilting and the feeding speed of the slide shaft are set to be the same in advance, the feeding amount can be controlled over time. In other words, the slide shaft only needs to be driven for about 7 seconds.

FIG. 2 shows an example of a shaft feeding mechanism, in which a rack gear 8 is provided at the rear end of the slide shaft, and a pinion gear 10 connected to a forward/reverse motor 9 meshes with this rack gear. The forward/reverse motor is energized to advance the slide shaft by an amount responsive to the above-mentioned amount of inclination. For example, if you use a gear with a motor rotation speed of 1400 RPM and a pitch of 3 mm, it will move 70 mm in 1 second, and therefore 490 mm in 7 seconds. In other words, in the case of adopting the above configuration, the aforementioned moving speed of the back frame and the feeding speed of the slide shaft when the back frame is raised and tilted are the same, so it is only necessary to use a common switch, and the response is improved. This is preferable because it also simplifies the configuration.

Since the detection of back frame movement amount, motor control, and other specific control mechanisms are already well known in the art, further explanation will be omitted for the sake of brevity.

FIG. 3 is an enlarged partial cross-sectional view of the tip of the slide shaft 3, which is a preferred embodiment of the present invention further equipped with an automatic fine-adjustment device that can automatically and remotely control the left, right, top, and bottom directions of the light section using only a switch. This shows that.

The drive cam 11 connected to the motor M is eccentric, and due to this eccentric movement, the ball bearing 5
The light section 4 supported by the can change its direction vertically and horizontally over the range shown by the arrow in the figure (crossing between the positions shown by the broken lines).
The motor M may be controlled by the aforementioned switch 7, in which case the operator can control the position of the back arm and the position and direction of the light section simply by operating the switch 7.

Thus, according to the present invention, when the back frame is raised or tilted, the position of the light section is always automatically adjusted in response to the amount of movement of the back frame. There is no need to adjust the direction and direction, and you can concentrate on treatment.

Furthermore, when a patient who comes to the hospital sits on or leaves the treatment table or gargles, there is no risk of the patient's head hitting the light section, and safety can be maintained.

[Brief explanation of drawings]

Fig. 1 is a schematic perspective view of a dental examination table explaining the mounting position of the dental light; Fig. 2 is a schematic perspective view showing the drive mechanism of the slide shaft drive unit; and Fig. 3 is a schematic perspective view of the slide shaft drive section. FIG. 3 is a partial cross-sectional view showing how the light section is attached to the section. DESCRIPTION OF SYMBOLS 1...Support stand, 2...Slide shaft support drive section, 3...Slide shaft, 4...Light section, 5...Ball joint, 6...Back frame, 7...Switch, 8...Rack gear,
9...Forward/reverse motor, 10...Pinion gear.

Claims (1)

[Claims] 1 Consists of a support stand, a freely retractable slide shaft held by the support stand, a slide shaft support drive section provided with an adjustable angle, and a light section provided at the tip of the slide shaft, and further includes a medical table. A dental device characterized by comprising a control mechanism for moving the light section back and forth by a distance corresponding to the movement distance of the back frame when the back frame is raised and tilted in response to the amount of inclination of the back frame. light.