JP3234182B2 - Dental care chair - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dental treatment chair, and more particularly, to a headrest in a dental treatment chair, and more particularly, to adjusting the height (tilt) of the headrest in treatment in a sleeping state. In this case, a sudden downward movement is prevented.

[0002]

2. Description of the Related Art FIG. 7 is a diagram showing the overall configuration of an example of a dental treatment unit to which the present invention is applied. In the drawing, reference numeral 10 denotes a dental treatment unit. It comprises a spittoon 3, a supply / discharge box 4, an instrument holder 5, a foot switch 6, an assistant instrument holder 7, and the like. The instrument holder 5 accommodates various instruments 8 used in dental treatment. As is well known, in performing dental treatment, a patient sits on a chair 1 and fixes his / her head on an abutment 9 to receive treatment. During the treatment, the operator moves the treatment chair 1 up and down, tilts down, tilts, etc., so that the patient can be treated in a posture that facilitates treatment.

In the dental treatment unit as described above,
At the time of treatment, the chair is turned down and the patient is treated while lying down. At this time, the lower part of the lower head 9 (the lower part in the raised state, that is, the part close to the patient's neck) is moved in the direction of the arrow. This makes it easier for the patient to open his mouth.

[0004]

As described above, in dental treatment, the patient is placed in a sleeping state, and the height (inclination) of the patient's neck is adjusted to thereby lower the backrest (backrest). (Closer to the patient) is moved up and down (back and forth when considered in the upright position) to make it easier for the patient to open his mouth, but when moving down (moving to lower the patient's crown), the lock When removed, it drops sharply due to the weight of the patient's head, giving the patient shock and fear. In addition, at this time, there is a problem that the lower part of the abutment table hits the neck of the patient and lifts the neck to compress the cervical spine of the patient.

In order to prevent the shock as described above, when the lock is released, the head is pressed down by hand so that the head does not drop suddenly. In particular, adjustment work was difficult for a weak doctor such as a female doctor.

[0006] The present invention has been made in view of the above circumstances, and particularly when adjusting the position of the patient's head during medical treatment in a sleeping state without pinching the patient's throat, Dental treatment with an abutment that can lower the position of the head (jaw) quietly with good operability without compressing the patient's cervical vertebra and without giving the patient's head a sudden movement. The purpose was to provide a chair.

[0007]

According to a first aspect of the present invention, there is provided a dental treatment apparatus which has a headrest and is capable of being turned upside down and performs dental treatment with the patient's head placed on the headrest when the head is lowered. A treatment chair, wherein the headrest is a headrest body on which a patient's head is placed, a headrest body support column for rotatably supporting lower lower sides of the headrest, and an upper back side of the support column and the headrest. And a piston / cylinder disposed between the headrest body and the piston / cylinder so as to rotate the headrest body below the headrest body. When the headrest body is rotated and the lower part of the headrest body is lifted, the neck of the patient enters the constricted portion and does not compress the cervical vertebra of the patient. Be configured to be obtained by it said.

According to a second aspect of the present invention, in the first aspect of the present invention, there is provided an air resistance element which has an air resistance when the piston is pushed into the cylinder and does not have an air resistance when the piston is pulled out. It is what it was.

According to a third aspect of the present invention, in the second aspect of the present invention, there is provided an air resistance element having an air resistance when the piston is pushed into the cylinder and not an air resistance when the piston is pulled out. It is what it was.

According to a fourth aspect of the present invention, in the third aspect of the invention, the air resistance element comprises a disk-shaped diaphragm disposed in the cylinder, and the diaphragm has at least one small diameter air resistance. It has a hole, and the diaphragm is provided in a large-diameter concave portion formed in the cylinder, and is movable in the axial direction of the cylinder within the concave portion.

According to a fifth aspect of the present invention, in any one of the first to fourth aspects of the present invention, the piston shaft has ratchet teeth along an axial direction, and the cylinder has a detent engaged with the ratchet teeth. A pawl is rotatably provided to lock movement of the piston shaft in a direction in which the piston shaft is inserted into the cylinder.

According to a sixth aspect of the present invention, in any one of the first to fourth aspects of the present invention, the cylinder has an inclined surface inclined in an insertion direction of the piston shaft and toward the piston shaft. A roller is inserted between the inclined surface and the piston shaft so as to be freely inserted and removed, and the roller locks the movement in the direction in which the piston shaft is inserted into the cylinder. It is what it was.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a schematic diagram showing a main part of an embodiment of an abutment used for a dental treatment chair according to the present invention.
FIG. 1A is a perspective view of an abutment according to the present invention from the back (rear) side, and FIG. 1B is a view of the abutment in a lying (inverted) state as viewed from the side. Reference numeral 11 denotes a headrest (ahead stand) body, 12 denotes an abutment stand support, and 13 denotes an abutment stand operating rod. Adjust the height position.

The lower part of the main body 11 is supported on both sides of the lower part by an abutment column 12 so as to be rotatable in the direction of arrow B.
In addition, one end of the upper portion of the back of the
Is connected to the column 12 by a piston / cylinder which is extendable and contractible in the direction of arrow C, and comprises a cylinder 14 fixed to the base and a piston 15 fixed at one end to the upper rear surface of the head base 11. Therefore, when moving the piston 15 in the arrow C ₁ direction shortening the length of the piston-cylinder, Yasuatamadai body 11 is rotated in the arrow B ₁ direction, to move the piston 15 in the arrow C ₂ direction piston the cylinder longer length, Yasuatamadai 11 moves in the arrow B ₂ direction.

FIG. 1B is a diagram for explaining the operation of the head rest body 11 in a state where the dental treatment chair is in a lying (sleeping) state. The solid line indicates that the head rest 11 is kept horizontal. In this state, the patient's head is kept substantially horizontal on the same plane as the torso. In this state, as described above, the piston to move the piston 15 in the arrow C ₁ direction
If the total length of the cylinder is shortened,
It turns around the point and becomes a state shown by a two-dot chain line in FIG. In the state shown by the two-dot chain line, the top of the patient is lowered and the neck (jaw) is raised, so that the patient can easily open his mouth.

As described above, in the present invention, the abutment main body 11 is rotated at the lower portion (a portion near the patient's neck) so that the patient can easily open his / her mouth. When the head table body 11 is rotated, the lower part of the head table body 11 hits the patient's neck and presses the patient's cervical spine, so that the patient may pinch the throat. An object of the present invention is to prevent such throat clogging of a patient. For this reason, as shown in FIG. Head body 11
Is tilted as shown by a two-dot chain line in FIG. 1 (B), the neck of the patient is inserted into the constricted portion 11a so that the patient's neck is not lifted, whereby the cervical spine of the patient is Not to squeeze.

FIG. 2 is an exploded perspective view of the abutment portion according to the present invention shown in FIG. 1. As shown in FIG. A pin 17 is inserted through a pin hole provided in the fixing member 16 and a pin hole provided in the upper end of the piston 15.
7 is fixed. The support 12 is provided with a cylinder support 19, and a pin 20 is inserted through a pin hole provided in the cylinder support 19 and a pin hole provided at a lower end of the cylinder 14. 20 is fixed.

Further, on both sides of the column 12, stupid holes 22 are provided, through which the head fixed shaft 23 is inserted. At the end of the fixed shaft 23, a male screw portion 23a is provided. After passing the male screw portion 23a through the stupid hole 22, a washer 24 is interposed, and
1 is screwed into female screw portions 25 provided on both sides of the base 1 and the head base fixing shaft 23 is fixed by a set screw 26, whereby the head base 11 is moved around the fixed shaft 23. It is rotatable. In addition, since the rotating shaft does not penetrate through the head base 11, the constricted portion 11a can be formed in the lower part of the head base 11.

FIG. 3 is an overall perspective view of the abutment portion according to the present invention as described above. In the drawing, portions having the same functions as those shown in FIGS. 1 and 2 are shown in FIGS. The same reference numerals as in the case of (1) are given. However, FIG. 3 shows a lock mechanism 30 described later, which is not shown in FIGS. 1 and 2. Here, as described above, the head 15 is moved by moving the piston 15 in the directions of arrows C ₁ and C ₂ ,
As described above, the piston 15 is rotated in the directions of arrows B ₁ and B ₂ around the abutment fixed shafts 23 provided on both sides of the abutment main body 11, and the piston 15 is moved to C ₁ (downward) moves in the direction) the patient rotates Ahn head rest main body 11 in the arrow B ₁ direction is in a state of easily opening the mouth.

FIG. 4 is a schematic diagram showing the essential parts for explaining the details of the piston 15 and the cylinder 14 described above.
(A) is an exploded perspective view of a piston / cylinder portion, and FIG.
FIG. 4B is an enlarged cross-sectional view of FIG. 4A when the part B is connected. First, the piston 15 has an O-ring 15 b at a lower end thereof.
The upper part has ratchet teeth 15a in the axial direction.
Further, the cylinder 14 is separated into 14a and 14b, the lower end of the cylinder 14a of a piston 15 is inserted through the male screw 14a ₁ is provided, in the side of the cylinder 14b which is fixed to the cylinder support 19 , The male screw 14a
₁ female screw 14b ₁ to be screwed is provided, it is 4
The connection is made as shown in an enlarged manner in FIG.

The cylinder 14a and 14b, as shown in FIG. 4 (B), when coupled, the interior, being adapted to the recess 14 ₀ of larger diameter is formed than the inner diameter of the cylinder, the recess 14 in _0, so that the disc-shaped diaphragm 27 is disposed. The diaphragm 27 is provided with a small-diameter hole 27a serving as air resistance.
Therefore, the previously arranged the disc 27 in the recess 14 ₀ of the cylinder 14, when depressing the piston 15 in the arrow C ₁ direction, the air in the cylinder 14a is air resistance 27a
Through the piston 15 due to its air resistance.
It is not rapidly lowered (C ₁ downward direction), moving slowly. However, when the piston 15 is moved upward, the diaphragm 27 floats upward and the diaphragm 27
Air flows through the gap between the inner wall of the recess 14 ₀ of the cylinder 14, the piston 15 can be moved easily without air resistance upward (C ₂ direction). The diaphragm 27 may be freely movable in the cylinder 14 as described above, but as shown in FIG.
One place may be loosely fixed by the set screw 28, and as shown by a chain line in the drawing, one point may be loosely fixed and turned.

FIG. 5 is a schematic diagram of the essential parts for explaining the details of the piston / cylinder lock mechanism 30. FIG. 5A is an external perspective view of the piston / cylinder part, and FIG.
(B) is a detailed enlarged view of the lock mechanism. As shown, the piston 15 is provided with ratchet teeth 15a in the axial direction, and the ratchet teeth 15a are engaged with the ratchet pawls 31. Has become. The ratchet teeth 15a and pawl 31, as shown in FIG. 5 (B), when moving the piston 15 in the arrow C ₂ (upward) is without any problem, but can move smoothly, C ₁
When moving in the direction (downward), the locking pawl 31 bites into the ratchet teeth 15a, is adapted to prevent downward movement of (C ₁ direction). That is, the lock mechanism 30
The above-mentioned pawls 31 and a spring 32 for constantly pressing the pawls 31 toward the ratchet teeth 15a, and engaging the pawls 31 with the ratchet teeth 15a or rotating the pawls 31 away from the ratchet teeth 15a. pin shaft 33, and consists of the support pillar 34 for mounting the pin shaft 33, when moving the piston 15 downwardly (C ₁ direction), the lock mechanism 30 in the direction of arrow D against the force of the spring 32 press, after detaching the pawl 31 from the ratchet teeth 15a, pushes down the piston 15 in the arrow C ₁ direction, at a predetermined position, again, by the action of the locking mechanism 30, holding the piston 15 in a predetermined position I am trying to do it.

FIGS. 6A and 6B are schematic views of a main part for explaining another embodiment of the lock mechanism 30. FIG. 6A is an exploded perspective view, and FIG. 6B is a sectional view of the main part after assembly. The lock mechanism 30 has a roller 35 at a tip end of a lever 31 rotatably around a roller shaft 36, and the cylinder 14
And 5 in the insertion direction (C ₁ direction) has an inclined surface 14 ₁ which is inclined toward the piston shaft 15, the roller 35 is interposed rotatably between the inclined surface 14 ₁ and the piston shaft 15 It is supposed to be. That is, the roller 35 is always
As shown, when the piston shaft 15 is interposed between the inclined surface 14 ₁ and the piston shaft 15 is moved in the arrow C ₁ direction, the roller 35 bites, the downward movement of the piston shaft 15 blocking and is, by pressing the locking mechanism 30 in the direction of arrow D, when the roller 35'll is disengaged from the inclined surface, it is possible to push down the piston shaft 15 downward (C ₁ direction). In addition, when raising upward, it can be pulled upward without operating any lock mechanism. Thus, according to this example, unlike the ratchet shown in FIG. 5, the position can be continuously adjusted.

As described above, in the dental treatment, the patient is placed in a lying state, and in this state, the piston 15 is depressed, and the head table main body 11 is rotated around the head table fixed axis to thereby move the head. Lower the top, push the jaw upwards,
The patient is easily opened. At this time, as described above, in order to push down the piston 15, the lock mechanism 30 must first be operated to release the lock of the piston 15, but at that time, Since the head of the patient rests on the head 11, when the lock is released, the weight of the head causes the piston 15 to drop suddenly, giving a shock to the patient or giving the patient anxiety.

[0025]

According to the present invention, an air resistance element (diaphragm with small holes) is provided in the cylinder to prevent the piston from descending rapidly due to the function of the air resistance element. I'm trying to do
The patient's head does not fall out and does not shock or anxious to the patient. Also, when releasing the lock, no sudden force is applied to the hand holding the head, so that even a weak female doctor can easily adjust.

Furthermore, since the center of rotation of the head table can be set as the center position of the patient's neck, the position of the head does not shift.
In addition, when the upper jaw treatment position is set, the portion of the lower end of the abutment where the neck comes into contact is narrowed, so that the neck is not pushed out and there is no fear of the throat getting clogged.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing a main part of an embodiment of an abutment used for a dental treatment chair according to the present invention.

FIG. 2 is an exploded perspective view of an abutment section shown in FIG. 1;

FIG. 3 is a perspective view of an abutment according to the present invention.

FIG. 4 is a schematic diagram of a main part for describing details of a piston and a cylinder part.

FIG. 5 is a schematic configuration diagram of a main part for describing a lock mechanism of a piston / cylinder unit.

FIG. 6 is a main part schematic configuration diagram for explaining another example of the lock mechanism of the piston / cylinder unit.

FIG. 7 is a diagram showing an example of a dental treatment chair to which the present invention is applied.

[Explanation of symbols]

9: Atodai, 11: Atodai body (headrest body),
11a: Ahead stand neck, 12: Ahead support, 13: Abutment operating rod, 14: Cylinder, 15: Piston, 25 ...
Air resistance element, 30 ... lock mechanism.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) A61G 15/00 A47C 7/38

Claims (6)

(57) [Claims] 1. A dental treatment chair having an abutment table and capable of being turned upside down and performing a dental treatment with a patient's head placed on the abutment table when falling down, wherein the abutment table is A headrest main body on which a patient's head is placed, a headrest main body support post rotatably supporting lower sides of the headrest, and a piston cylinder disposed between the support post and an upper backside of the headrest. And a dental treatment chair having the headrest body rotated below the headrest body by expanding and contracting the piston / cylinder,
The headrest body is configured such that the lower part is constricted upward, and when the headrest body is rotated and the lower part of the headrest body is lifted, the neck of the patient enters the constricted part and does not compress the cervical spine of the patient. A dental treatment chair characterized by being made. 2. The dental treatment chair according to claim 1, further comprising an air resistance element which becomes air resistance when the piston is pushed into the cylinder and does not become air resistance when the piston is pulled out. 3. The air resistance element comprises a disk-shaped diaphragm disposed in the cylinder, the diaphragm having at least one small diameter air resistance hole,
The dental treatment chair according to claim 2, wherein the diaphragm is disposed in a large-diameter recess formed in the cylinder, and is movable in the recess in the axial direction of the cylinder. 4. The dental treatment according to claim 3, wherein the diaphragm is attached to the cylinder at one point in a peripheral portion, and is rotatable around the attachment portion in the axial direction of the cylinder. Chair. 5. The piston shaft has ratchet teeth along the axial direction, and the cylinder has a detent pawl that engages with the ratchet teeth so as to be rotatable, and the piston shaft is inserted into the cylinder. The dental treatment chair according to any one of claims 1 to 4, wherein a movement in a direction to be performed is locked. 6. The cylinder has an inclined surface inclined in a direction of insertion of the piston shaft and toward the piston shaft, and is inserted between the inclined surface and the piston shaft so as to be detachable. The dental treatment chair according to any one of claims 1 to 4, further comprising a roller, wherein the roller locks movement of the piston shaft in a direction in which the piston shaft is inserted into the cylinder.