JPH0696Y2 - Treader in treatment device - Google Patents

Description

Description: TECHNICAL FIELD The present application relates to a pedal in a medical or dental treatment device in which a voltage is regulated by a pedal pressure.

2. Description of the Related Art Conventionally, for example, in a dental handpiece having a built-in micromotor, a treadle that adjusts a voltage supplied to the micromotor is used in order to change the rotation speed of the micromotor. When gripping a piece and cutting a tooth, depress the pedal of the treadle with your foot,
The voltage supplied to the micromotor is adjusted according to the degree of the pedaling pressure, and the voltage adjustment was performed exclusively by a slide resistor.

The problem to be solved by the invention is that, according to the conventional stepping device using a slide resistor, heating is likely to occur and damage due to abrasion is apt to occur, size is increased, and voltage adjustment cannot be accurately obtained. There was such a defect.

Means for Solving the Problems Therefore, the present application is to improve the above-mentioned defects of the conventional one by using a pressure-sensitive resistance element, and a pressure-sensitive resistance element and a pressure-resisting piece are provided between the base and the pedal. The resistance change according to the degree of pedaling pressure of the pedal is input to the voltage adjusting circuit via the.

Action However, when the pedal is depressed against the elastic piece, a compressive force acts on the pressure-sensitive element via the elastic force of the elastic piece, and the resistance value changes correspondingly. Adjustments are made.

EXAMPLE An example of the present application will be described in detail with reference to the drawings below. FIG. 1 shows a block diagram of a dental treatment apparatus. (1) is a water source, (2) is a power source, and (3) is a water supply. With a solenoid valve connected to the source (1),
Its output is connected to the water circuit of a dental handpiece (4) containing a DC micromotor. (5) is the power supply
A voltage adjusting circuit having a rectifying circuit and the like connected to (2), the output end of which is connected to the energizing circuit of the dental handpiece (4). (6) is a stepping device, and the voltage adjusting circuit (5) is adjusted according to the stepping degree.

As shown in FIG. 2, the foot pedal (6) has a plate-shaped foot pedal (11) pivotably attached (12) to the tip of a heavy plate-shaped base 10 that does not move easily. At the same time, between the base (10) and the foot pedal (11), a pressure-sensitive resistance element (13) whose resistance changes corresponding to a change in pressure, and a repulsion part (1
4), and the pressure-sensitive resistance element is a voltage adjustment circuit (5).
The output from the voltage adjusting circuit (5) is supplied to the solenoid valve (3) by the resistance change caused by the element (13).

Then, when the foot pedal (11) is depressed against the oppressing piece (14), a compressive force acts on the pressure-sensitive resistance element (13) via the elastic force of the oppressing piece (14). The resistance value changes correspondingly, and the voltage adjustment circuit (5) is adjusted by the resistance value.

Therefore, the voltage supplied to the micromotor of the dental handpiece (4) is changed corresponding to the stepping pressure of the foot pedal (11), the number of circuits is also changed, and the voltage adjustment circuit (5) is also changed.
The solenoid valve (3) also operates along with the operation of (1), water is supplied from the water source (1) into the dental handpiece, and this becomes mist from the nozzle at the tip of the handpiece, cutting the tooth. Directed to the department.

FIG. 3 shows a treadle (6) in another embodiment,
This treadle (6) is formed in a cap-like shape in a base (15) of a heavy bottomed cylinder having an annular rib (15) 'on the inner circumference of the upper opening, and the annular shape is formed on the lower outer circumference. A foot pedal (16) having an annular engaging piece (16) 'that engages with the rib (15)' is fitted slidably in the vertical direction, and the base (15) and the foot pedal (16) are A pressure-sensitive resistance element (13) and an opening / closing valve (17) having a restoring elastic piece instead of the solenoid valve (3) shown in FIG. 1 are interposed between the foot valve and the foot pedal (16).
Between the engaging piece (16) 'and the bottom surface of the base (14), an elastic pressure spring (18) is supplementarily interposed, and its action is the same as that of the first embodiment. It is the same. In the figure
(13) 'is a lead wire, and (17)' is a movable rod.

Effect of the Invention Since the present application is constructed as described above, there is no fear of heating or wear, and it is highly durable, has a simple structure and is effective for downsizing, and is elastic. Since the parts are interposed, there is an advantage that accurate voltage adjustment can be obtained and the treading operation can be performed smoothly.

[Brief description of drawings]

The drawings show an embodiment of the present application. FIG. 1 is a block diagram of a dental treatment apparatus, FIG. 2 is a side view of a treadle, and FIG. 3 is a sectional view of a treadle in another embodiment. In the figure, (10) and (15) are bases, (11) and (16) are foot pedals, (13) is a pressure sensitive resistance element, (14) is an elastic piece, and (17) is an on-off valve.

Claims (1)

[Scope of utility model registration request] 1. A treading device in a therapeutic apparatus, wherein a pressure sensitive resistance element and a pressure-resisting portion are interposed between a base and a pedal, and a resistance change depending on a treading degree of the pedal is input to a voltage adjusting circuit.