JPH07250871A - Dental treatment stand - Google Patents

Abstract

PURPOSE:To provide a dental treatment stand enhanced in safety, constituted so as to detect contact of a tray table, an arm or a medical treatment machinery with an obstacle in the course of a lowering operation to enable the falling operation of a legless chair and a back plate to stop. CONSTITUTION:A back plate 5 is connected to a legless chair 4 permitting a patient to sit down in a freely tiltable manner and the legless chair 4 and the back plate 5 are driven up and down by a lift cylinder 6 and the back plate 5 is tilted by a tilting cylinder 7. The base end part of an arm 10 is connected to the back plate 5 in a freely revolvable manner and a tray table 14 is supported at the free end part of the arm 10 in a freely revolvable manner and a first stop means 15 is provided to the rear surface of the tray table 14 and a second stop means 16 is provided to the base end part of the arm 10. When the tray table 14 or the arm 10 comes into contact with an obstacle to be pushed up, the lowering operation of at least one of or both of the lift cylinder 6 and the tilting cylinder 7 is stopped.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dental examination table, and more particularly, to an automatic stop mechanism for a dental examination table in which a tray table is provided on a back plate.

[0002]

2. Description of the Related Art The first prior art is, for example, Shoukaisho 60.
-97123 publication. In this prior art, the seat and the backboard are raised or lowered and the backboard is tilted with respect to the seat, and the rear end of the arm is in a horizontal state regardless of the tilted position of the backboard. There is disclosed a dental examination table which is rotatably provided around a vertical axis and in which a tray table is rotatably supported at a free end portion of the arm around a vertical axis.

In such prior art, when the seat and back plate are lowered or when the back plate is tilted downward, the arm or tray table comes into contact with an object such as the operator's leg or chair. However, since the structure for stopping the descending motion of the seat and the back plate and the tilting motion of the back plate downward is not provided, these descending motions cannot be stopped. Therefore, unless the surgeon or the assistant moves the back plate, the arm and the obstacle existing under the tray table, the descending motion continues,
There is a problem that safety is compromised.

The second prior art is, for example, Japanese Patent Laid-Open No. 59-59.
No. 181155. In this prior art, an auxiliary member is connected to a seat and / or a back plate in a dental examination table in which the seat and the back plate are raised or lowered and the back plate is tilted with respect to the seat chair. A switch means is provided between the member and the chair or between the auxiliary member and the back plate so that when an obstacle comes into contact with the seat and / or the back plate, A configuration for stopping the operation is disclosed.

In the second prior art as described above, the descending motion of the seat and the back plate can be stopped only when an obstacle comes into contact with the seat and the back plate. By the auxiliary member provided on the child and the back plate,
The configuration becomes complicated and large. Further, since the tray table is not provided on the back plate, even if an object comes into contact with the tray table or an arm that connects the tray table to the back plate, it is not possible to stop the descending motion of the seat and the back plate. Have the problem.

The third prior art is, for example, in Japanese Utility Model Publication No. 56-
No. 42217. In this prior art,
A unit main body provided on one side of the medical examination table is provided with a hanger that can be horizontally moved by an arm and is rotatable about a vertical axis and corresponds to the tray table of the present invention. This hanger is provided with a sensing member corresponding to the abutting member of the present invention and two micro switches for detecting the displacement of the sensing member, and when an obstacle comes into contact with the sensing member A, a seat chair And configured to stop the operation of the backboard.

In the third prior art as described above, since the hanger corresponding to the tray table of the present invention is provided not in the back plate but in the unit main body, the structure is different from that of the second prior art. Although it is possible to avoid complication and increase in size, it is not possible to detect the contact of the obstacle with the back plate and the seat chair, and the obstacle that hits the arm connecting the hanger and the unit body is hit. The contact cannot be detected either.

[0008]

In the above-mentioned three prior arts, the tray table shown in the first prior art is provided with the sensing member and the microswitch shown in the third prior art to form a chair and a chair. Although it is easily conceivable to detect the abutment of an obstacle accompanying the descending of the backboard and stop the descending motion of the seat and the backboard, the sensing member can detect the abutment of the obstacle. Is extremely small, and it is impossible to stop the lowering motion of the chair and backboard by detecting the contact of an obstacle with the arm and other medical equipment provided in association with the tray table. Have.

Accordingly, it is an object of the present invention to detect the abutting of obstacles to a tray table and other articles, such as arms and associated medical equipment, associated therewith, in a wide range, to seat chairs and / or backs. It is an object of the present invention to provide a dental examination table with improved safety capable of stopping the descending operation of the plate.

[0010]

SUMMARY OF THE INVENTION The present invention is directed to a seat chair on which a patient is seated, a back plate tiltably connected to the seat chair, and a lifting drive for lifting or lowering the seat chair and the back plate. Means and tilt drive means for tilting the back plate with respect to the seat chair,
The base end is connected to the back plate so as to be rotatable about the vertical axis in a horizontal state regardless of the tilted position of the back plate and to be angularly displaceable upward from the horizontal position in a plane including the vertical axis. Arm, a tray table rotatably supported on the free end of the arm about a vertical axis, and an elevating drive means when an object located below the tray table comes into contact with the tray table. And / or first stop means for stopping the descending operation of the tilting drive means, and a first stop means provided on the arm for stopping the descending operation of the elevating and lowering drive means and / or the tilting drive means when the arm is pushed upward. The dental examination table is characterized by including two stopping means.

Further, according to the present invention, the first stopping means is provided with a plate-shaped contact member which is suspended substantially parallel to the lower surface of the tray table and is spaced from the tray table by a distance between the contact member and the tray table. A first switching element that detects a change is included.

Further, the present invention is characterized in that a means for urging a spring in a direction of separating the contact member from the tray table is interposed between the contact member and the tray table.

Further, the present invention is characterized in that the abutting member is provided with a holder for holding medical equipment.

Further, according to the present invention, the second stop means includes a first hinge piece to which a second switching element is attached and which is rotatably connected to a back plate about a vertical axis, and a horizontal axis line to the first hinge piece. A second hinge piece that is rotatably connected around and to which the arm is fixed; and an operation piece that is fixed to the first hinge piece and is pressed by the second hinge piece,
And a second switching element for switching the on / off state by pressing the operating piece and releasing the pressed state.

Further, in the invention, in the first hinge piece,
It is characterized in that means for restricting the lower limit position of the second hinge piece is provided.

Still further, according to the present invention, a seat chair on which a patient sits, a back plate tiltably connected to the seat chair, an elevating drive means for raising or lowering the seat chair and the back plate, and a back. A tilting drive means for tilting the plate with respect to the seat; and a base end portion on the back plate, including the vertical axis so as to be rotatable about the vertical axis in a horizontal state regardless of the tilted position of the back plate. An arm connected so as to be angularly displaceable upward from a horizontal position in a plane, a tray table rotatably supported by a free end of the arm around a vertical axis, and a lower surface of the tray table with a space therebetween. It has a plate-shaped abutting member suspended in parallel and a switching element for detecting a change in the distance between the abutting member and the tray table. Drive means and / or A dental treatment table which comprises a stopping means for stopping the downward movement of the dynamic driving means.

The present invention also relates to a seat chair on which a patient sits,
A back plate tiltably connected to the seat, a lifting drive means for raising or lowering the seat and the back plate, and a back plate,
Inclination drive means for inclining with respect to the seat and a base end portion on the back plate, rotatably around the vertical axis in a horizontal state regardless of the tilt position of the back plate, and in a plane including the vertical axis. The arm is mounted on the arm so that it can be angularly displaced upward from a horizontal position, the tray table is supported by the free end of the arm so as to be rotatable about the vertical axis, and the arm is provided to be pushed upward. In this case, the dental examination table is characterized in that it includes stop means for stopping the lowering operation of the lifting drive means and / or the tilt drive means.

[0018]

According to the present invention, the back plate is tiltably connected to the seat chair on which the patient is seated, and these seat chair and back plate can be raised or lowered by the elevating drive means. Further, the back plate can be tilted with respect to the seat chair by tilting drive means. Therefore, the patient sitting on the chair should be treated by the surgeon with the upper body upright, that is, with the medical treatment position in an upright position, or with the upper body in a substantially horizontal position, that is, with the medical treatment position horizontal. You can

An arm is provided on the back plate. This arm is kept horizontal regardless of the tilting position of the back plate and is rotatable about the vertical axis. At any position around this vertical axis, the arm can move from a horizontal position within a plane including the vertical axis. Can be angularly displaced upward. Therefore, even when an obstacle comes into contact with the arm when the seat and the back plate are lowered by the lifting drive means or when the back plate is tilted downward by the tilt drive means, the arm is moved from the horizontal position. It can be retracted upwards. Such an arm may be composed of a single member or may be composed of a plurality of members.

A tray table is rotatably supported on the free end of the arm about a vertical axis. On the tray table, a tray on which medicines and various instruments necessary for medical treatment are mounted is placed.

A first stopping means is provided on the lower surface of such a tray table. When an object located below the tray table comes into contact with the first stopping means, the first stopping means stops the lowering operation of the lifting drive means and / or the tilting drive means. That is, when only the raising / lowering drive means is stopped, the back plate is kept in a constant tilting position, and the seat chair stops the lowering operation together with the back plate. Also, when only the tilt drive means is stopped, the tilting movement of the back plate to the lower side is stopped while the seat chair is kept in a constant lifting position,
Further, when both the raising and lowering drive means and the tilting drive means are stopped, the lowering operation of the seat is stopped together with the tilting operation of the back plate downward.

A second stopping means is provided on the arm. When the arm is pushed upward from the horizontal position, the second stop means is a lifting drive means or a tilt drive means,
Alternatively, the descending operations of both the lifting drive means and the tilt drive means are stopped. In this way, when the obstacle comes into contact with the descending tray table, the first stopping means can respond to stop the descending operation, and when the obstacle comes into contact with the descending arm. The second stopping means can respond to stop the descending operation. Therefore, even when the tray table and the arm are rotated around the vertical axis, when the tray table and the arm come into contact with the obstacle, the descending operation thereof can be stopped, and the safety is improved.

According to the invention, the first stopping means detects the change in the distance between the contact member arranged on the lower surface of the tray table and the tray table by the first switching element, and when the distance changes. , Stop the lowering operation of the elevation drive means and / or the tilt drive means. Since the abutting member is plate-shaped, it can be detected in a wide range below the tray table by one first switching element on each side, and the obstacle can be detected in a wide range in the entire movable range of the tray table or the arm. It is possible to stop the lowering operation of the elevation drive means and / or the tilt drive means by detecting contact with an object.

Further in accordance with the present invention, spring biasing means is provided between the contact member and the tray table. Even if an obstacle comes into contact with the contact member by the spring urging means and the contact member is displaced toward the tray table side, the contact member is reliably returned in the direction away from the tray table. It is possible to prevent malfunction such as the stop means remaining in the off state.

Furthermore, according to the present invention, the abutting member is provided with a holder for holding medical equipment. Even when an obstacle comes into contact with such a holder, the lowering operation of the elevation drive means and / or the tilt drive means can be stopped.

Further in accordance with the present invention, the second stop means is a first plate connected to the back plate so as to be rotatable about a vertical axis.
A second hinge piece is rotatably connected to the hinge piece about a horizontal axis, the second hinge piece is fixed to an arm, and a second switching element is attached to the first hinge piece. Therefore, when the descending arm contacts an obstacle and is pushed upward, the second hinge piece is angularly displaced with respect to the first hinge piece, and the actuating piece of the second switching element is pressed by the second hinge piece. The switching mode changes. Since the arm is connected to the back plate in this way, even if the arm is rotated about the vertical axis, there is no possibility that external force acts on the operating piece of the second switching element due to the rotation of the arm. (2) Damage to the switching element is prevented, and the upward movement of the arm is reliably detected regardless of the rotating position of the arm, and the lowering operation of the elevation drive means and / or the tilt drive means is stopped. Can be made.

Further in accordance with the present invention, the first hinge piece is provided with means for restricting the lower limit position of the second hinge piece.
Since the arm is fixed to the second hinge piece, the lower limit position of the arm can be restricted by the lower limit position restricting means, so that the arm and the tray table are rotatably positioned about the vertical axis at a desired height. You can do it.

Further, according to the present invention, a back plate is tiltably connected to the seat chair which is raised or lowered by the lifting drive means, and the back plate is tilted with respect to the seat chair by the tilt drive means. A base end portion of an arm is connected to the back plate so as to be rotatable about a vertical axis and angularly displaced upward from a horizontal position in a plane including the vertical axis. A tray table is supported on the free end of the arm so as to be rotatable about a vertical axis, and a contact member and a change in the distance between the contact member and the tray table are detected on the lower surface of the tray table. And a switching element. A seat chair by the lifting drive means and / or tilt drive means,
When an obstacle comes into contact with the abutting member while the back plate, the arm and the tray table are being lowered, the switching mode of the switching element is changed and the lowering operation of the elevating and lowering drive means and / or the tilting drive means is performed. Be stopped. Such stopping means can stop the descending operation when an obstacle comes into contact with the abutting member regardless of the position of the tray table. The descending motion of the chair and back plate can be stopped.

Further, according to the present invention, a back plate is tiltably connected to the seat chair which is raised or lowered by the lifting drive means, and the back plate is tilted with respect to the seat chair by the tilt drive means. . A base end portion of an arm is connected to the back plate so as to be rotatable about a vertical axis and to be angularly displaceable upward from a horizontal position in a plane including the vertical axis. At the free end of this arm, a tray table is rotatably supported around a vertical axis and a stop means is provided. When the obstacle comes into contact with the arm during the lowering operation of the seat and / or the back plate, the stopping means stops the lowering operation of the elevating drive means and / or the tilting drive means. Since such an arm is rotatable about the vertical axis, it is possible to detect the contact of an obstacle with the arm when descending in a wide range and stop the descending operation.

[0030]

1 is a side view showing a dental examination table 1 according to an embodiment of the present invention, FIG. 2 is a front view of the dental examination table 1 seen from the left side of FIG. 1, and FIG. FIG. 3 is a plan view of the dental examination table 1 viewed from above. The dental examination table 1 according to the present embodiment includes a seat 4 on which a patient 3 sits, a back plate 5 that is automatically or manually connected to the seat 4 so as to be tiltable in the directions of arrows A1 and A2, and automatically or A double-acting hydraulic cylinder 6 for raising and lowering, which is a raising and lowering driving means for manually raising the seat 4 and the back plate 5 in the arrow B1 direction or lowering them in the arrow B2 direction;
A tilting double-acting hydraulic cylinder 7 which is tilting driving means for tilting the back plate 5 in the arrow A1 and A2 directions with respect to the seat 4;
The base end portion 8 is rotatable about the vertical axis 9 in a horizontal state on the back plate 5 regardless of the tilting position of the back plate 5, and the arrow points upward from the horizontal position in a plane including the vertical axis 9. C1,
An arm 10 connected so as to be angularly displaceable in the C2 direction, a tray table 14 rotatably supported by a free end portion 11 of the arm 10 around a vertical axis 13, and a tray table 14.
First stopping means 15 which is provided on the lower surface of the tray table and stops the lowering operation of the double-acting hydraulic cylinder 6 for elevation and / or the double-acting hydraulic cylinder 7 for tilting when an object located below the tray table 14 comes into contact with the same. The second stop means 16 is provided on the arm 10 and stops the lowering operation of the double-acting hydraulic cylinder 6 for elevation and / or the double-acting hydraulic cylinder 7 for tilting when the arm 10 is pushed upward.

The patient 3 is sitting on the chair 4 with both legs raised, and is in a standing position leaning against the back plate 5 which is erected as shown by the phantom line 17 in FIG. Chair 19
By sitting on the floor and operating the foot pedal 20, the back plate 5 tilts from the state indicated by the imaginary line 17 in the direction of the arrow A1, and the patient 3 is in the horizontal treatment position in which the patient is lying sideways. The parietal midline of 3 is 1 in the plan view of FIG.
At the 2 o'clock position, the surgeon 18 performs the medical examination work at a position around 11 o'clock with the center line of the trunk substantially aligned with the working point of the patient 3, that is, the oral cavity. At this time, the tray table 14 is at the position shown by the phantom line 14a in FIG. 3 and FIG. 5, which will be described later, and is pulled in the direction of the arrow D1 to a distance where the medical instrument on the tray table 14 can be sufficiently reached. The patient 3 is treated in the closed state. In this case, the foot pedal 20 is operated so that the working point of the patient 3 is at a position that can be clearly recognized by the operator 18, and the tilting position of the back plate 5 in the arrow A1 and A2 directions and the seat 4 and the back plate. Adjust the ascending / descending position of arrow 5 in the directions of B1 and B2. Depending on the treatment site, the surgeon 18 moves to the position indicated by the phantom line 21 in FIG. 3 while keeping the patient 3 in the standing position, and the instrument 18 moves as indicated by the phantom line 14b in FIG. 3 and FIG. The tray table 14 is inverted around the vertical axis 13 in the direction of the arrow E2 so that 23 is on the front side, and the arm 10
At the same time, the medical care may be performed by pulling it in the direction of arrow D2. Also in this case, the operator 1 whose medical treatment site is the virtual line 21
The foot pedal 20 is operated so that the height of the patient 3 is adjusted so that the height can be clearly recognized from FIG.

Further, one kind or several kinds of heights of the seat 4 and the back plate 5 or angles of the back plate 5 are set in advance so that the treatment position of the patient 3 can be appropriately set according to the treatment site.
During the treatment work, the seat chair 4 and the back plate 5 can be automatically raised or lowered to a desired height set in advance or the back plate 5 can be tilted to a desired angle set in advance automatically by selection. A position control switch 100 can also be provided.

The automatic position control switch 100
Is, for example, a button switch, a touch sensor, or the like, and may be provided at an appropriate place in addition to the shoulder portion of the back plate 5, a tray arm, a foot controller, or the like, and may be provided as a switch independent of the treatment table. Good.

As described above, the tray table 14 can be used regardless of whether the patient 3 is in the standing position or the horizontal position.
It is necessary to draw the instrument 23 within a range within which the instrument 23 can be reached with certainty. However, at this time, the operator 18 adjusts the height of the patient 3 centering on the examination site of the patient 3, so that the operator 18 The arm 10 and the tray table 14 that have descended to the leg portions 24 of the above may come into contact with each other. As described above, when the leg 24 of the operator 18 as an object arranged below the arm 10 and the tray table 14 comes into contact with the arm 10 or the tray table 14 during the lowering operation, the first stopping means 15 described above is used. Alternatively, the second stopping means 16
Thus, the lowering operation of the lifting double-acting hydraulic cylinder 6 and / or the tilting double-acting hydraulic cylinder 7 can be stopped.

FIG. 4 shows the arm 10 and the tray table 1.
4 is a cross-sectional view of FIG. 4, and FIG. 5 is a plan view of the vicinity of the arm 10 and the tray table 14. The arm 10 includes a tilting shaft 26 from one side of the back plate 5 with respect to the seat 4 of the back plate 5.
(See FIG. 3) It is connected to a connecting shaft 25 that protrudes in the axial direction parallel to (see FIG. 3). The connecting shaft 25 is attached to the arrow marks A1, A2 of the back plate 5 by a link mechanism (not shown) built in the back plate 5.
Regardless of the tilting position in the direction, the tray table 14 is rotated with respect to the back plate 5 so that it is always horizontal.

At the free end of the connecting shaft 25, the base end 8 of the arm 10 is rotatable about the vertical axis 9 in the directions of arrows D1 and D2 by the first shaft 27 having the vertical axis 9. Be connected. The tray table 16 is connected to the free end 11 of the arm 10 by a second shaft 28 having a vertical axis 13 so as to be rotatable around the vertical axis 13 in the arrow E1 and E2 directions. The second shaft 28 is moved by the knob 29.
The free end portion 11 of the arm 10 can be positioned and fixed at any position in the vertical direction along the vertical axis 13.
The upper portion of the second shaft 28 is pivotally supported by the bearing 30, and the bearing 30 is fixed to the lower surface 31 of the tray table 14.

The tray table 14 includes an aluminum support plate 33 to which the bearing 30 is fixed, and a synthetic resin table body 34 mounted on and supported by the support plate 33.
And a tray 35 mounted on the table body 34, to which, for example, a filth holder, a medicine bottle holder, a gauze holder and the like are attached. Such a tray table 14
Is provided with the above-mentioned first stopping means 15.

FIG. 6 is a partial sectional view showing a mounting state of the first stopping means 15 and the tray table 14. The first stopping means 15 includes a plate-shaped aluminum contact member 36 suspended from the lower surface 31 of the tray table 14 in a substantially parallel manner with a gap L1 between the contact member 36 and the tray table 14. It includes a microswitch 37 which is a first switching element for detecting a change in the distance L1. The contact member 36 is suspended from the lower surface 31 of the tray table 14 by a plurality of (in this embodiment, 6) dampers 38. Further, the micro switch 37 is fixed to the lower end of the inverted L-shaped mounting member 39. Operating piece 40 of this micro switch 37
Is in contact with the upper surface 41 of the contact member 36. Therefore, when the contact member 36 is pushed upward from below in the direction of approaching the tray table 14, that is, the distance L1.
When is changed to a smaller value, the on / off state is switched. Such a change in the signal of the micro switch 37 is guided to a control device (not shown) via the lead wire 43, and stops the lowering operation of the lifting double-acting hydraulic cylinder 6 and / or the tilting double-acting hydraulic cylinder 7.

The damper 38 has one end in the axial direction fixed to the support plate 33 of the tray table 14 by a screw 44 and a piston rod 46 having an annular flange 45 formed at the other end in the axial direction, and an abutting member. The casing 48 having a bottomed right cylindrical shape fixed to the 36 by a screw 47, a compression coil spring 49 housed in the casing 48, and a spring biased by the compression coil spring 49 housed in the casing 48. An annular retaining piece 50 for retaining the flange 45 on the open end side of the casing 48.

By providing the damper 38 having such a structure, when the abutting member 36 descends and comes into contact with an obstacle, the impact can be mitigated, and
The contact member 36 can be reliably returned to the initial position forming the interval L1.

As shown clearly in FIG. 5, the contact member 36 as described above is provided in the area between the vertical axis 13 and the peripheral portion on the side where the instrument 23 is arranged, and the tray table 14 is provided. Is provided across both ends in the longitudinal direction (vertical direction in FIG. 5).

Referring again to FIG. 4, the abutting member 36 has a substantially U-shaped connector holder 51 and an instrument holder 5 which is a holder for holding medical equipment.
3 and 3 are provided so as to project below the contact member 36. A socket 55 is fixed to the connector holder 51, and a plug 56 that is connected to a tube 54 connected to each instrument 23 is detachably attached to the socket 55. A tube 57 is connected to the socket 55, and together with the lead wire 43, a flexible hose 58.
It is loaded inside and is connected to the back surface of the back plate 5.

FIG. 7 is an enlarged sectional view of the vicinity of the second stopping means 16, and FIG. 8 is an exploded perspective view of the second stopping means 16.
The second stopping means 16 has a first hinge piece 60 to which a microswitch 59, which is a second switching element, is attached and which is rotatably connected to the back plate 5 about the vertical axis 9.
A second hinge piece 63 rotatably connected to the first hinge piece 60 about a horizontal axis 61, and a first and second hinge piece 60, 63 rotatably connected about the horizontal axis 61. And a third shaft 64.

The first hinge piece 60 is formed in a generally stepped shape, and is arranged on the side of the connecting shaft 25.
5, a second portion 66 integrally formed on one side of the first portion 65, and a third portion 67 integrally connected to the second portion 66. In the first portion 65, the first shaft 27
One end of is inserted and locked by a taper pin (not shown). The first shaft 27 has a right cylindrical columnar shaft portion 68 and a flange portion 69 integrally formed between both ends in the axial direction of the shaft portion 68, and a synthetic resin is provided on the lower end portion side of the shaft portion 67. A thrust washer 70 made of steel is attached. With the thrust washer 70 attached, as clearly shown in FIG. 7, the thrust washer 70 is inserted into the insertion hole 73 formed in the receiving portion 71 of the connecting shaft 25, and protrudes downward from the insertion hole 73. A thrust washer 74 made of synthetic resin and a frustoconical disc spring 75 are attached to the lower end of the shaft 68, and then two nuts 76 and 77 are screwed on.

With this structure, the receiving portion 71 of the connecting shaft 25 is tightened with the nuts 76 and 77 so that the thrust washers 70 and 74 are interposed on both sides by the spring force of the disc spring 75. It is elastically clamped by the flange 69 and the disc spring 75. Therefore, the first hinge piece 60 connected to the first shaft 27 as described above.
Is a disc spring 75 upward along the vertical axis 9 of the first shaft 27.
Can be displaced against the spring force of. With such a configuration, even when the arm 10 is pushed upwards unnecessarily with a large force, the connecting shaft 25 and the back plate 5
It is possible to allow the arm 10 to be displaced upward by compressing and deforming the leaf spring 75 without exerting a large force on the arm 10.

A shaft hole 78 through which the third shaft 64 is inserted is formed in the second portion 66 of the first hinge piece 60.

In addition, a screw hole 79 is formed in the third portion 67 of the first hinge piece 60 so as to be substantially parallel to the insertion hole 75, and the screw hole 79 is for limiting the lower limit position of the second hinge piece 69. The adjusting bolt 80 is screwed. The end surface of the adjusting bolt 80 that protrudes upward from the screw hole 79 contacts the lower surface of the second hinge piece 63, and
Supports 3. The micro switch 59 is fixed to one side surface 83 of the third portion 67 by a screw or the like.

The second hinge piece 63 is a plate-shaped base portion 85 fixed to the arm 10 by a plurality of screws 84, and a shaft hole 86 formed integrally with the base portion 85, into which the third shaft 64 is inserted. A pair of bearing portions 8 in which 87 are respectively formed
8 and 89. There is a first gap between the bearings 88 and 89.
Fitting recess 90 into which the second portion 66 of the hinge piece 60 fits
Is formed. With the second portion 66 fitted in the fitting recess 90, each of the shaft holes 86, 87 and the second portion 66.
The shaft holes 78 communicate with each other on the same axis line, the third shaft 64 is inserted, and the first hinge piece 60 and the second hinge piece 63 are rotatably connected to each other.

One end of the pressing spring 93 in the longitudinal direction is fixed to the lower surface 81 of the second hinge piece 63 with a screw 91. The other end of the pressing spring 93 has a first hinge piece 66.
Elastically abuts the lower surface 94 of the third portion 67 of the. When the arm 10 is lifted upward, the pressing spring 93 causes the second hinge piece 63 to move against the first hinge piece 60.
4 is elastically urged in the direction of arrow F2 around the horizontal axis 61 to securely return the arm 10 to the horizontal position.

FIG. 9 is a block diagram for explaining a schematic structure for controlling the double-acting hydraulic cylinder 6 for raising and lowering and the double-acting hydraulic cylinder 7 for tilting. The above-mentioned two micro switches 37 and 59 are connected to the control means 95 realized by a CPU (central processing unit),
Each time the switching mode of each microswitch 37, 59 changes, the input signal to the control means 95 switches from low level to high level. When the input signal from at least one of the microswitches 37 or 59 becomes high level, the drive means 96, 97 cause the solenoid valves 98, 99 to operate.
The valve closing signal is simultaneously output to each double-acting hydraulic cylinder 6,7.
The supply direction of the pressure oil from the hydraulic pressure source 90 to the pressure source is switched. In this way, when at least one of the micro switches 37, 59 is switched from the low level to the high level, the lowering operation of the double-acting hydraulic cylinders 6, 7 is stopped.

As another embodiment of the present invention, the first stopping means 15 may be realized by a pressure sensitive sheet switch attached to the lower surface of the contact member 36.
Further, instead of the micro switch 37 of the first stopping means 15, an optical detection element such as a photo interrupter is attached to the mounting member 3.
9, a contact member 36 is provided with a shielding member that can be inserted into the optical path between the light emitting element and the light receiving element that form the photointerrupter, and an obstacle is brought into contact with the contact member 36. When pushed up, the light emitted from the light emitting element may be blocked to change the switching mode.

As described above, according to the present invention, the contact member 3
When an obstacle comes into contact with the armature 6, it is detected by the microswitch 37 which is the first switching element, and the arm 1
When an obstacle comes into contact with 0 and is pushed up, it is detected by the microswitch 59 which is the second switching element. Therefore, regardless of the rotational positions of the arm 10 and the tray table 14, the obstacle is generated when the two descend. It is possible to reliably detect the contact with the contact point, and it is possible to improve safety.

In the above embodiment, the first and second stopping means 15 and 16 are provided on the dental treatment table, but as another embodiment of the present invention, the first and second stopping means 15 and 16 are provided. Only one of them may be provided.

[0054]

According to the present invention, when the seat and the back plate are lowered or the back plate is tilted and lowered, when the object located below the tray table comes into contact with the first stop means, the first stop is performed. The means stops the lowering operation of the lifting drive means and / or the tilt drive means. That is, when only the raising / lowering drive means is stopped, the backrest is kept in a constant tilting position and the seat chair stops descending together with the backboard, and when only the tilting drive means is stopped, the seat chair is stopped. When the child is kept in a constant lifting position, the downward tilting operation of the back plate is stopped, and when both the lifting drive means and the tilting drive means are stopped, the descending operation of the seat chair is stopped, The downward tilting motion of the back plate stops.

A second stopping means is provided on the arm. When the arm is pushed upward from the horizontal position, the second stop means is a lifting drive means or a tilt drive means,
Alternatively, the descending operations of both the lifting drive means and the tilt drive means are stopped. In this way, when the obstacle comes into contact with the descending tray table, the first stopping means reacts to stop the descending operation, and when the obstacle comes into contact with the descending arm. The second stopping means can react to stop the lowering operation. Therefore, even when the tray table and the arm are rotated around the vertical axis, when the tray table and the arm are in contact with the obstacle, the descending operation thereof can be stopped, and the safety is improved.

Further, according to the present invention, the first stop means detects a change in the distance between the contact member arranged on the lower surface of the tray table and the tray table by the first switching element, and when the distance changes. , The lowering operation of the traveling drive means and / or the tilt drive means is stopped. Since the contact member is plate-shaped, the single first switching element can provide a wide detection area under the tray table, and the contact with the obstacle can be detected in the wide range to move up and down. And / or the lowering operation of the tilting drive means can be stopped.

Further, according to the present invention, spring urging means is provided between the contact member and the tray table. Even if an obstacle comes into contact with the abutting member by the spring biasing means and the abutting member is displaced toward the tray table side, the abutting member is reliably returned in the direction away from the tray table to prevent malfunction. be able to.

Further, according to the present invention, the abutting member is provided with a holder for holding medical equipment. Even when an obstacle comes into contact with such a holder, the lowering operation of the elevation drive means and / or the tilt drive means can be stopped.

Further, according to the invention, the second stopping means is a first plate connected to the back plate so as to be rotatable about a vertical axis.
A second hinge piece is rotatably connected to the hinge piece about a horizontal axis, the second hinge piece is fixed to an arm, and a second switching element is attached to the first hinge piece. Therefore, when the descending arm contacts an obstacle and is pushed upward, the second hinge piece is angularly displaced with respect to the first hinge piece, and the actuating piece of the second switching element is pressed by the second hinge piece. The switching mode changes. Since the arm is connected to the back plate in this way, even if the arm is rotated about the vertical axis, there is no possibility that external force acts on the operating piece of the second switching element due to the rotation of the arm. (2) Damage to the switching element is prevented, and the upward movement of the arm is reliably detected regardless of the rotating position of the arm, and the lowering operation of the elevation drive means and / or the tilt drive means is stopped. Can be made.

Furthermore, according to the present invention, the first hinge piece is provided with means for restricting the lower limit position of the second hinge piece.
Since the arm is fixed to the second hinge piece, the lower limit position of the arm can be restricted by the lower limit position restricting means, so that the arm and the tray table are rotatably positioned about the vertical axis at a desired height. You can do it.

Further, according to the present invention, the back plate is tiltably connected to the seat chair which is raised or lowered by the lifting drive means, and the back plate is tilted with respect to the seat chair by the tilt drive means. A base end portion of an arm is connected to the back plate so as to be rotatable about a vertical axis and angularly displaced upward from a horizontal position in a plane including the vertical axis. A tray table is rotatably supported around the vertical axis on the free end of the arm, and a contact member is detected on the lower surface of the tray table, and a change in the distance between the contact member and the tray table is detected. And a switching element. When an obstacle comes into contact with the contact member while the seat chair, the back plate, the arm and the tray table are being lowered by the lifting drive means and / or the tilt drive means, the switching mode of the switching element changes. Thus, the lowering operation of the lifting drive means and / or the tilt drive means is stopped. Such stopping means can stop the descending operation when the obstacle comes into contact with the abutting member regardless of the position of the tray table. The descending motion of the child and the back plate can be stopped.

Further, according to the present invention, the back plate is tiltably connected to the seat chair which is raised or lowered by the lifting drive means, and the back plate is tilted with respect to the seat chair by the tilt drive means. . A base end portion of an arm is connected to the back plate so as to be rotatable about a vertical axis and to be angularly displaceable upward from a horizontal position in a plane including the vertical axis. At the free end of this arm, a tray table is supported rotatably around a vertical axis and a stop means is provided.
When the obstacle comes into contact with the arm during the descending operation of the seat chair and / or the back plate by the stopping means, the descending operation of the elevating drive means and / or the tilting drive means is stopped. Since such an arm is rotatable about the vertical axis,
Detecting that an obstacle has come into contact with the arm over a wide range,
The lowering operation can be stopped.

[Brief description of drawings]

FIG. 1 is a side view showing a dental examination table 1 according to an embodiment of the present invention.

FIG. 2 is a front view of the dental examination table 1 as viewed from the left side of FIG.

FIG. 3 is a plan view of the dental examination table 1 viewed from above in FIG. 1.

FIG. 4 is a sectional view of an arm 10 and a tray table 14.

FIG. 5 is an enlarged plan view showing the vicinity of the arm 10 and the tray table 14.

FIG. 6 is a partial cross-sectional view showing a specific configuration of the first stopping means 15.

FIG. 7 is a partial cross-sectional view showing a specific configuration of the second stopping means 16.

FIG. 8 is an exploded perspective view of the second stopping means 16.

FIG. 9 is a block diagram showing a schematic configuration for controlling a double-acting hydraulic cylinder for lifting 6 and a double-acting hydraulic cylinder for tilting 7.

[Explanation of symbols]

 1 Dental Examination Table 3 Patient 4 Seat Chair 5 Back Plate 6 Double-acting Hydraulic Cylinder for Lifting 7 Double-acting Hydraulic Cylinder for Tilt 8 Base End 9, 13 Vertical Axis 10 Arm 11 Free End 14 Tray Table 15 First Stop Means 16 Second Stop Means 17, 21 Virtual Line 18 Operator 20 Foot Pedal 23 Instrument 24 Leg 25 Connection Shaft 27 First Shaft 28 Second Shaft 31 Lower Surface 36 Abutment Member 37, 59 Micro Switch 38 Damper 51 Connector Holder 53 Instrument holder 54,57 Tube 60 First hinge piece 61 Horizontal axis 63 Second hinge piece 64 Third axis 80 Adjustment bolt 95 Control means 96,97 Drive means 98,99 Solenoid valve

Claims (8)

[Claims] 1. A seat chair on which a patient sits, a back plate tiltably connected to the seat chair, an elevating and lowering drive means for raising or lowering the seat chair and the back plate, and a back plate as a seat. Inclination drive means for inclining with respect to the chair, and a base end portion on the back plate, which is rotatable about the vertical axis in a horizontal state regardless of the tilt position of the back plate and within a plane including the vertical axis. An arm that is angularly movable upward from a horizontal position, a tray table that is supported by the free end of the arm so as to be rotatable around a vertical axis, and that is provided below the tray table and is located below the tray table. A first stopping means for stopping the descending operation of the lifting drive means and / or the tilting drive means when the object to be touched contacts the arm, and the lifting drive means and / or Or of tilt drive means Dental treatment table which comprises a second stop means for stopping the descending operation. 2. The first stopping means detects a change in a distance between a plate-shaped contact member suspended on the lower surface of the tray table in a substantially parallel manner with a space therebetween, and a distance between the contact member and the tray table. The dental examination table according to claim 1, further comprising: 3. The dental treatment according to claim 2, wherein a means for urging a spring of the contact member in a direction separating from the tray table is interposed between the contact member and the tray table. Stand. 4. The dental examination table according to claim 2, wherein the abutting member is provided with a holder for holding medical equipment. 5. The second stopping means includes a first hinge piece to which a second switching element is attached and which is rotatably connected to a back plate about a vertical axis, and a first hinge piece that rotates about a horizontal axis. A second hinge piece that is movably connected and to which the arm is fixed; and an operating piece that is fixed to the first hinge piece and that is pressed by the second hinge piece. The dental examination table according to any one of claims 2 to 4, further comprising: a second switching element that switches an on / off state by releasing. 6. The dental examination table according to claim 5, wherein the first hinge piece is provided with means for restricting a lower limit position of the second hinge piece. 7. A seat chair on which a patient sits, a back plate tiltably connected to the seat chair, an elevating and lowering drive means for raising or lowering the seat chair and the back plate, and a back plate. Inclination drive means for inclining with respect to the chair, and a base end portion on the back plate, which is rotatable about the vertical axis in a horizontal state regardless of the tilt position of the back plate and within a plane including the vertical axis. An arm that is angularly displaceable upward from a horizontal position, a tray table that is supported by the free end of the arm so that it can rotate around a vertical axis, and a tray table that is suspended approximately parallel to the bottom surface of the tray table with a gap. Has a plate-shaped contact member and a switching element that detects a change in the distance between the contact member and the tray table, and by changing the on / off state of the switching element, the lifting drive means and / or Or under the tilt drive means A dental examination table comprising: stop means for stopping the descending operation. 8. A seat chair on which a patient sits, a back plate tiltably connected to the seat chair, an elevating and lowering drive means for raising or lowering the seat chair and the back plate, and a back plate. Inclination drive means for inclining with respect to the chair, and a base end portion on the back plate, which is rotatable about the vertical axis in a horizontal state regardless of the tilt position of the back plate and within a plane including the vertical axis. An arm that is angularly movable upward from a horizontal position, a tray table that is supported by the free end of the arm so as to be rotatable around a vertical axis, and that is provided on the arm, and this arm is pushed up. At this time, the dental examination table is characterized by including stop means for stopping the descending operation of the lifting drive means and / or the tilt drive means.