JP4361224B2 - Dental unit hose sagging prevention and pull-in biasing device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a hose sag prevention and retraction biasing device for a dental unit, and more specifically, so that the hose connected to the instrument of the dental unit can be smoothly pulled out and retracted while preventing sag. The present invention relates to a hose sagging prevention and pull-in urging device.
[0002]
[Prior art]
In the bracket table 54 of the conventional dental unit, when the instrument 51 is stored in the instrument holder 53 at the lower front part, the hose 52 connected to the instrument 51 hangs down as shown in FIG. Will come into contact with the floor surface 60. If the dentist is using the instrument 51 in this state, the hose 52 itself is dirty or scratched, and is unsanitary. .
[0003]
Further, when the instrument 51 is pulled out and used as shown in FIG. 8 and then the hose 52 is pulled back and stored in the instrument holder 53, the hose 52 is brought into contact with the floor surface. Hygienic problem that the dirty part slides on the supporting part of the instrument holder 53 and soils the part, and the operation that the hose 52 that hangs down cannot be stored smoothly due to contact with the floor surface. There is a problem of deterioration.
[0004]
For these reasons, recently, coil springs, springs, leaf springs, etc. have been used to increase the force to pull the hose backwards as it is pulled out. A dental unit constructed so as to be retracted is proposed (see JP-A-7-136223 and JP-A-7-299104).
[0005]
However, in the case of such a dental unit, when the dentist uses the instrument, there is always a force to pull the hose back, so the dentist resists the force to pull back. Therefore, there is a problem that it is difficult to perform detailed work.
[0006]
[Problems to be solved by the invention]
The present invention has been made in view of the above circumstances, and can smoothly perform pulling out and pulling in of a hose connected with an instrument while preventing the sagging, and has excellent hygiene and good operability. It is an object of the present invention to provide a hose sagging prevention and pull-in biasing device.
[0007]
[Means for Solving the Problems]
The hose sagging prevention and pull-in biasing device of the dental unit according to the first aspect of the invention is rotatably supported by a pivot shaft provided on the bracket table and is accommodated in an instrument holder in the dental unit. One end is supported at a fixed position on the bracket table, a hose arm that slidably supports a hose connected to the instrument, a spring-loaded arm that is pivotally supported together with the hose arm by a pivot shaft. The other end is slidably supported by the arm for spring application, and a biasing spring that applies a biasing force in the pull-in direction to the hose. The slurry at the other end position of the biasing spring with respect to the spring-engaging arm is rotated and interlocked with the rotation of the hose arm. By utilizing the change in the rotational torque acting on the hose due to the fluctuation of de position, it is characterized in that to perform the anti-sagging while adjusting the Kase force in the retraction direction of the hose.
[0008]
According to a second aspect of the present invention, in the hose sagging prevention and pull-in biasing device of the dental unit according to the first aspect, a spacer for regulating the slide position of the other end position of the biasing spring is provided on the spring-hanging arm. It is characterized by this.
[0009]
A third aspect of the present invention is the hose sagging prevention and pull-in biasing device of the dental unit according to the first or second aspect, wherein a plurality of hose arms and a spring hook for a plurality of hoses with respect to the rotating shaft are provided. The arm and the urging spring are connected in series, and the sag is prevented while adjusting the urging force in the pull-in direction of each of the plurality of hoses.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
[0011]
FIG. 1 is a plan view of a dental unit 1 including a hose sagging prevention and pull-in urging device of the present embodiment, and FIG. 2 is a front view of the dental unit 1.
[0012]
The dental unit 1 includes a treatment chair 2 for a patient, a bracket table (hereinafter simply referred to as “table”) 4 supported by a support arm 3 erected from the treatment chair 2, an illumination device 5, and the like. The hose sagging prevention and pull-in urging device 10 is incorporated into the table 4.
[0013]
One end of a plurality of instrument hoses (hereinafter simply referred to as “hose”) 11 is connected to the bottom 4 a of the table 4 via a terminal 14.
[0014]
A plurality of instruments 12 respectively connected to the other end of a plurality of instrument hoses 11 are provided at the lower part of the front end side of the table 4 (the head side of the patient lying on the treatment chair 2). An instrument holder 13 is provided for supporting each detachably housed.
[0015]
As shown in FIG. 3, the hose sagging prevention and pull-in urging device 10 has a rotating shaft 21 arranged in a direction perpendicular to the paper surface in FIG. 3 on the rear side of the connection position of the terminal 14 in the bottom 4 a of the table 4. A plurality of hose arms 22 are rotatably supported by the rotation shaft 21 in a continuous arrangement.
[0016]
A plurality of rollers (or rollers) 23 that slidably support the vicinity of the terminals 14 of the plurality of hoses 11 are attached to the protruding ends of the plurality of hose arms 22, respectively.
[0017]
Further, a spring-loaded arm 24 that rotates coaxially and in conjunction with the hose arm 22 is attached to the rotating shaft 21.
[0018]
One end of a biasing spring 26 is attached to a pin 25 provided at a fixed position behind the rotating shaft 21 in the bottom portion 4a of the table 4 and is attached to the outer periphery of the spring-loaded arm 24 so as to be slidable. The other end of the urging spring 26 is attached to the slide member 27, and the urging spring 26 is configured to always apply a pulling direction force P indicated by an arrow in FIG. .
[0019]
A structure including the hose arm 22, the spring application arm 24, the urging spring 26, and the slide member 27 is connected to the rotating shaft 21 corresponding to the plurality of hoses 11.
[0020]
Next, the operation of the hose sagging prevention and pull-in urging device according to the present embodiment will be described in detail with reference to FIGS. 4 and 5 by taking as an example the case where one hose 11 is pulled out and pulled.
[0021]
As shown in FIG. 4, the effective length of the biasing spring 26 in an unstretched state is C, and the distance from the center of the rotating shaft 21 to the point of application of the spring force of the biasing spring 26 in the spring application arm 24 is A. The distance to the center of the roller 23 attached to the hose arm 22 is B, the spring force of the biasing spring 26 at this time is Q, and the force to pull the hose 11 backward by the hose arm 22 and the roller 23 is Assuming P, this force P can be expressed by the equation P = Q × A / B.
[0022]
Next, as shown in FIG. 5, the dentist pulls out the hose 11 for treatment, and the hose arm 22 and the spring-loaded arm 24 rotate clockwise from the position of FIG. 4 as shown in FIG. A case will be considered in which the operating point of the spring force of the biasing spring 26 against the spring application arm 24 is slid from the position shown in FIG.
[0023]
At this time, the length of the extended biasing spring 26 is C ′, and the distance from the center of the rotating shaft 21 to the point of application of the spring force of the biasing spring 26 in the spring application arm 24 is A ′. The distance to the center of the attached roller 23 is B, the spring force of the biasing spring 26 at this time is Q ′, the force to pull the hose 11 backward by the hose arm 22 and the roller 23 is P ′, , R represents a circumferential component force about the center of the rotating shaft 21 at the point of application of the spring force Q ′ of the spring 26.
[0024]
In this case, the force P ′ = R × A ′ / B for pulling up the hose 11 backward by the hose arm 22 and the roller 23 can be expressed by the following formula.
[0025]
Therefore, an increase in the spring force due to the extension of the biasing spring 26 (ratio between the spring force Q of the biasing spring 26 and the circumferential component force R) and the point of action of the spring force of the biasing spring 26 on the spring application arm 24 are as follows. By appropriately setting the relationship between the action point distance ratio (A / B and A ′ / B ratio) associated with the slide, the forces P and P ′ for pulling the hose 11 backward can be set to a desired torque curve. Can be set to draw.
[0026]
As a result, the hose arm 22 is rotated in accordance with the change in the drawing position of the hose 11, and the biasing spring 26 is changed by the rotation of the spring-engaging arm 24 interlocked with the rotation of the hose arm 22. By changing the rotational torque in the pulling direction acting on the hose 11 by sliding the point of action of the spring force, the urging force in the pulling out and pulling direction of the hose is adjusted appropriately so that the operability of the dentist is good. However, it is possible to prevent the hose 11 from drooping.
[0027]
That is, the contact with the floor surface 20 of the hose 11 can be prevented to avoid unsanitary factors such as dirt, and the instrument 12 connected to the tip of the hose 11 can be easily stored in the instrument holder 13.
[0028]
FIG. 6 shows an example in which a spacer 28 for restricting the sliding position of the other end position of the biasing spring 26 is attached to a position in the vicinity of the rotating shaft 21 of the spring application arm 24.
[0029]
If comprised in this way, the sliding amount of the action point with respect to the arm 24 for springing of the urging | biasing spring 26 can be made less than the case shown in FIG. As the distance increases, the point of action of the rotational moment increases. Therefore, it becomes possible to make the pulling force acting on the hose 11 larger than the case shown in FIG. That is, when the hose 11 is pulled up, the pulling force increases, and when the instrument 12 is stored in the instrument holder 13, priority is given to the return of the hose 11, which facilitates the storing operation. It is possible to cope with the demands of dentists who want to increase
[0030]
【The invention's effect】
According to the present invention, the situation where the instrument hose comes into contact with the floor surface and becomes unsanitary is eliminated, and the hose is not pulled more than necessary during the treatment work, and the instrument is quickly stored when the instrument is stored. It is possible to pull up the ment hose and to provide a dental unit hose sag prevention and pull-in urging device with good operability.
[0031]
In addition, according to the present invention, it is possible to provide a dental unit hose sag prevention and pull-in urging device that can increase the pulling force when the hose is pulled up to increase the ease of return of the hose.
[0032]
Furthermore, according to the present invention, there is provided a dental unit hose sagging prevention and pull-in urging device capable of exerting the above-described effects even in a dental unit having a plurality of instruments with a plurality of hose configurations. Can be provided.
[Brief description of the drawings]
FIG. 1 is a plan view of a dental unit including a hose sagging prevention and retracting biasing device according to an embodiment of the present invention.
FIG. 2 is a front view of a dental unit including a hose sagging prevention and pull-in urging device according to the present embodiment.
FIG. 3 is a partially enlarged view showing a table, a hose, and a hose sagging prevention and pull-in urging device according to the present embodiment.
FIG. 4 is an operation explanatory diagram when the hose is pulled up by the hose sagging prevention and pull-in urging device according to the present embodiment.
FIG. 5 is an operation explanatory diagram when the hose is pulled out of the hose sagging prevention and pull-in urging device according to the present embodiment.
FIG. 6 is a partially enlarged view showing a state where a spacer is mounted on the spring-loaded arm of the present embodiment.
FIG. 7 is a schematic view showing a floor contact state of a hose in a conventional dental unit.
FIG. 8 is a schematic view showing a state in which a hose is pulled out from a table in a conventional dental unit.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Dental unit 2 Treatment chair 3 Support arm 4 Bracket table 4a Bottom part 5 Illuminating device 10 Energizing device 11 Hose 12 Instrument 13 Instrument holder 14 Terminal 20 Floor 21 Rotating shaft 22 Hose arm 23 Roller 24 Spring hook Arm 25 pin 26 bias spring 27 slide member 28 spacer

Claims (3)

A hose arm that is rotatably supported by a rotation shaft provided on the bracket table and slidably supports a hose connected to an instrument housed in an instrument holder in the dental unit;
A spring-loaded arm supported so as to be rotatable together with the hose arm by a rotating shaft;
One end is supported at a fixed position of the bracket table, the other end is slidably supported by the arm for spring application, and a biasing spring that applies a biasing force in the pulling direction to the hose,
The hose arm is rotated in accordance with the change in the hose pull-out position, and acts on the hose according to the change in the slide position of the other end position of the biasing spring with respect to the spring-engaging arm interlocked with the rotation of the hose arm. A hose sag prevention and retraction urging apparatus for a dental unit, wherein the hose sag is prevented while adjusting the urging force in the retraction direction of the hose by utilizing a change in rotational torque. 2. The dental unit hose sag prevention and pull-in urging device according to claim 1, wherein a spacer for restricting a sliding position of the other end position of the urging spring is provided on the spring application arm. A plurality of hose arms for a plurality of hoses, an arm for spring application, and a biasing spring are connected to the rotating shaft to prevent drooping while adjusting the biasing force in the pull-in direction of each of the plurality of hoses. The hose sagging prevention and pull-in urging device for a dental unit according to claim 1 or 2, characterized in that:

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