JPS6158189B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a safety device for dental, other medical, barber, etc. treatment tables. When an obstacle (such as the therapist's legs or a chair) comes into contact with the back of the seat or backboard and obstructs its movement, the seat or backboard automatically stops moving, or instead of the original movement, a small amplitude movement occurs. The device is designed to bring the machine into a holding state consisting of reciprocating motion.

A detailed explanation will be given below using a dental treatment table as an example. 1st
The dental treatment table T shown in Figs. It is carried out by manual button operation by the therapist. On the other hand, in the treatment table T shown in FIG. 10, the back plate 2 does not tilt, but only the seat 1 moves up and down. While the seat 1 and back board 2 continue to move on any treatment table T, the therapist's legs (particularly when the back board is laid down horizontally for diagnosis while supine, the doctor's legs may become unstable). Other unforeseen obstacles such as chairs may come into contact with the back of seat 1 or back board 2 and prevent their movement; However, if the human body is soft, such as the legs, the movement may progress and cause injury due to pinching.

The present invention has been made in view of the above, and is designed to operate the safety device as described above in conjunction with the above-mentioned lifting/lowering and tilting. In the figures, Fig. 1 is a side view showing an embodiment of the dental treatment table according to the first embodiment of the present invention, Fig. 2 is a plan view of the same, and Fig. 3 a and b are back plates. 4 is an enlarged side view of the main parts of the dental treatment table of the second embodiment, FIG. 4 is an enlarged side view of the main parts of the dental treatment table of the second embodiment, and FIG. 6 is the -
7 is a second example of the electric circuit diagram, FIG. 8 is a side view of the main part of the back plate of the dental treatment table of the third embodiment, and FIG. 9 is a sectional view taken along the line shown in FIG. The figure is a side view of the dental treatment table of the fourth embodiment, and FIG. 11 is a longitudinal sectional view of the main parts of the lifting mechanism of the same embodiment. As can be seen from the figure, the safety device of the present invention is applied to a treatment table T equipped with a seat 1 that can be raised and lowered and/or a back plate 2 that can be tilted. The safety device S is equipped with a safety device S that operates by connecting the seat 1 and/or the back plate 2 connected to the driving source P, and the safety device S operates when the seat 1 and/or the back plate 2 are connected to the driving source P, and when an obstacle hits the seat 1 and/or the back plate 2 during the movement process. an auxiliary member 3 connected to the seat 1 and/or back plate 2 so as to be able to temporarily move by a predetermined angle or distance relative to the seat 1 and/or back plate 2 when the movement is prevented by abutting; Auxiliary member 3 and the seat 1
and or between the back plate 2 and the auxiliary member 3
The switch means 4 detects that the auxiliary member 3 has moved by a predetermined angle or distance with respect to the seat 1 and/or the back plate 2 in a direction opposite to the direction in which its own weight is applied.

In the following four embodiments, the object member according to the invention is divided into a tilting back plate 2 and a rising/lowering seat 1, and the movement is stopped after a while after coming into contact with an obstacle (not shown). The difference between the embodiments lies in whether the system is placed in a standby state until the obstacle is removed or in a standby state until the obstacle is removed.

First, the safety device S of the first embodiment works in conjunction with the tilting of the back plate 2 and stops the tilting after contact is detected. That is, FIG. 3a shows the treatment table in its normal state, and FIG. 3b shows it in contact with an obstacle (not shown). In FIGS. 1 to 3 a and b, the backboard 2 is tiltable around a pivot 10 horizontally suspended at one end of the seat 1, and the tilting is caused by the side of the seat frame 11 of the seat 1. It is implemented by a hydraulic device P as a fixed driving source, and specifically, a crank 5 is attached to the tip of a hydraulic piston P1, and this crank 5
The other end is pivotally attached to the pivot 10, and is further provided with a cutout step 51 in the area within the thickness of the back plate 2, while both ends of the lower part of the back plate 2 are attached to the pivot 10 as shown in FIG.
As shown in FIGS. 1 and 3a and 3b, one end thereof is provided with a cutout step 21 corresponding to the step 51, and an end 2110 of the convex portion 211 forms the cutout step. It abuts against the edge 5120 of the recess 512 of 51 to support the weight of the back plate 2 on one side. A small gap 6 is provided between the side edge of the convex portion 211 and the side edge of the convex portion 511 of the notch step portion 51, and the micro switch 4 is fixed to the convex portion 211, and the operating rod 40 is fixed to the convex portion 211. is in contact with the side edge of the convex portion 511. From this configuration, if the piston P1 moves in the direction of the double arrow, the back plate 2 will tilt backwards (inverted),
Lean forward (stand up) by moving in the direction of the single arrow.
In this example, the auxiliary member 3 consists of the notch step 51 of the crank 5 and the back plate 2, which face each other with the above-mentioned small gap 6 between them.
It consists of a notch step portion 21. To explain the operation of this example, as shown in FIG. 3b, when the back plate 2 reaches a state in which an obstacle comes into contact with the back and prevents the back tilt while the back plate 2 is in the process of tilting backward, the back plate 2 will be in that state. However, due to the small gap 6, the crank 5 is allowed to rotate further backward from the position shown in the figure, and the small gap 6 is narrowed so that the side edges of the protrusion 511 and the side edges of the protrusion 211 are in contact with each other. Rotation stops at the point of contact. Therefore, if the operating rod 40 of the micro switch 4 is made to detect the rotation by this small rotation, and the detection signal is used to construct a circuit as shown in FIG. Stop. That is, in FIG. 4, S1 is a switch for starting rearward tilting, S2 is a limit switch for detecting the maximum backward tilting position, and S3 is a switch that rotates for a while after hitting an obstacle to confirm contact, that is, the above-mentioned switch. 4, R are backward tilt holding relays, contacts R1, R2, R
In conjunction with 3, when this is ON, contacts R1 and R
2. Close R3, and when it is off, turn off these contacts at the same time. R1 is hydraulic motor M ON,
The OFF contact and SV are backward tilting solenoid valves. In this circuit configuration, when switch S1 is turned on, relay R
In addition to self-holding by the hydraulic motor M
Turn ON, open the backward tilting solenoid valve SV, and turn the switch S1
Even if you release the button, the backward tilt will continue, but after the back plate 2 has rotated for a while after being stopped by the obstacle due to the above operation, the switch 4 will be turned OFF, so the contacts R1 and R2 will be turned off. , R3 are opened and the backward tilting stops. When the obstacle is removed, the back plate 2 tilts slightly backward due to its own weight, and the switch 4 returns to its original position by re-opening the small gap 6. When switch S1 is turned on again, backward tilting is started. Also, the seventh
With the circuit configuration as shown in the figure, the back plate 2 makes a small amplitude reciprocating movement (more precisely, a reciprocating tilting motion) and is in a standby state until the obstacle is removed. At this time, the micro switch 4 connects one of the two circuits to the operating rod 4.
This is a two-way switch that can be selected by switching 0. In Figure 7, SV
Reference numeral 1 denotes a forward tilting solenoid valve, which is connected in parallel with the backward tilting solenoid valve SV, and a switch 4 is used to selectively switch between the two with respect to the power supply. Others are 4th
Since it is similar to the circuit shown in the figure, the explanation will be omitted. When the switch 4 performs a switch operation during the remaining backward tilt by the above operation, the backward tilt solenoid valve SV in FIG. 7 closes, and the forward tilt solenoid valve SV1 opens instead, and the back plate 2 tilts forward. During the forward tilting process, the backward tilting solenoid valve SV opens again by the switch operation, and the forward tilting solenoid valve SV opens.
1 closes. Such forward and backward tilting is performed alternately and continuously over the small gap 6, and the robot is in a standby state. When the obstacle is removed, the back plate 2 tilts backward due to its own weight, and continues its original backward tilt by providing a small gap 6.

Two examples of safety circuits are shown above. Fourth
The safety circuits in Figures 1 and 5 are as follows:
Each of the embodiments shown in FIG. 8, FIG. 8, and FIG. 10 can be applied as appropriate.

The second embodiment similarly provides safety for tilting the back plate 2, but the detection method of the switch 4 is different. In FIG. 5 showing the second embodiment, the crank 5 does not have a cutout step 51, but instead a U-shaped cover plate 7 is arranged behind the back plate 2 over almost the entire length of the back plate 2. The lower end of the back plate 2 is pivotally connected to the pivot 10, and an inclined gap 71 that can gradually increase the gap toward the upper part of the back plate 2 is provided, and a spring spacer 72 is inserted into this inclined gap 71 so that the back plate 2 and cover plate 7
The inclined gap 71 is maintained between the two. The micro switch 44 is attached to the upper side surface of the back plate 2, and its operating rod 40 is brought into contact with the cover plate 7. The auxiliary member 3 having this configuration is composed of a cover plate 7 placed at the back of the back plate 2 with the above-mentioned inclined gap 71 in between. Even if the back of the cover plate 51 is currently prevented from tilting by an obstacle, the back plate 2 will tilt backward with respect to the cover plate 51 until the inclined gap 71 disappears. However, due to the tilting during this time, the operating rod 40 of the microswitch 4 operates, and this residual backward tilting is detected.

The third embodiment is a development of the second embodiment, and instead of detecting the obstacle over the entire length of the back plate 2, as shown in FIGS. 8 and 9, it detects the obstacle only on the upper half. The difference in structure from the second embodiment is that a new pivot 8 is provided at approximately the center of the height of the back plate 2, and the cover plate 51 is attached in the same manner as the pivot 10 in the previous example. It is a point. The operation of this example is basically the same as the previous example, so the explanation will be omitted, but in the case of the standby state circuit configuration of FIG. 7, the reciprocating tilting range is shortened, so the physical sensation and noise caused by vibration are reduced.

The fourth embodiment has a seat 1 [this seat 1 has a backboard 2]
This figure shows an example of a safety device related to the lifting and lowering of a vehicle. As shown in FIG. 11, the seat 1 is automatically raised and lowered by a ball screw 11 of a motor m installed in the base B of the treatment table T.
In this embodiment, a U-shaped outer frame 1 is provided on the outside of the seat 1.
2 is applied as an auxiliary member 3, and this outer frame 12 is loosely fitted to the base B with a vertical gap 14, and a spring spacer 13 is interposed between the outer frame 12 and the seat 1, and a gap 15 is provided between them. The seat 1 has a double structure that can be raised and lowered elastically with respect to the outer frame 12 by means of the spacer 13, and the micro switch 4 is installed in the gap 15, and the operating rod 40 is connected to the inner surface of the outer frame 12. Let it touch. Even if the lowering of the outer frame 12 is prevented by an obstacle during the lowering of the seat 1, the seat 1 is still lowered a little by the ball screw against the elasticity of the spacer 13 until it absorbs the gap 13. Ru. At this time, switch 4 is activated to detect the descent. By activating this detection signal by applying the aforementioned safety circuit, the descent can be stopped or put into a standby state. In the first to third embodiments, the tilting of the backboard and the drive source that controls the tilting of the backboard have been described, but even if the backboard does not tilt, the drive source that controls the elevation of the seat ( (not shown), the safety device on the back plate is activated.

The present invention has been described above with reference to four preferred embodiments, but the present invention includes mutual combinations, substitutions, additions, changes, and modifications that do not depart from the scope of the appended claims. For example, the concept of the present invention includes those using pressure-sensitive conductive rubber as the switch means, and treatment tables for other general medical treatments such as dentistry and barbers are also included in the concept of the present invention.

As understood from the description, when the movement of the seat or backboard is blocked by an unexpected obstacle, the movement automatically stops or the movement is removed until the obstacle is removed. Since it performs a standby exercise that is different from the exercise of

[Brief explanation of the drawing]

FIG. 1 is a side view showing an embodiment of the dental treatment table according to the first embodiment of the present invention, FIG. 2 is a plan view of the same, FIG. 3 is an enlarged side view of the main part of the back plate, and FIG. 4 5 is an enlarged side view of the main parts of the dental treatment table of the second embodiment, FIG. 6 is a cross-sectional view taken along the - line in FIG. 5, and FIG. 7 is a second example of the electric circuit. , FIG. 8 is a side view of the main part of the back plate of the dental treatment table of the third embodiment, FIG. 9 is a sectional view taken along the line of FIG. 8, and FIG. 10 is a side view of the dental treatment table of the fourth embodiment. FIG. 11 is a longitudinal sectional view of the main parts of the lifting mechanism of the same embodiment. Explanation of symbols, T...Treatment table, 1...Seat, 2...
... Back plate, S... Safety device, 3... Auxiliary member, 4...
…Switch means.

Claims (1)

[Scope of Claims] 1. In a treatment table T equipped with a seat 1 that can be raised and lowered and/or a back plate 2 that can be tilted, the treatment table T is linked with the raising and lowering of the seat 1 and/or the tilting of the back plate 2. The safety device S is equipped with a safety device S that operates when the seat 1 and/or the back plate 2 are connected to the drive source P, and when an obstacle comes into contact with the seat 1 and/or the back plate 2 during the movement process. an auxiliary member 3 connected to the seat 1 and/or the back plate 2 so as to be able to temporarily move by a predetermined angle or distance relative to the seat 1 and/or the seat 2 when the movement is blocked; 3 and the seat 1 and/or the backboard 2, and the auxiliary member 3 is located at a predetermined angle or distance with respect to the seat 1 and/or the backboard 2 on the opposite side to the direction in which the weight of the auxiliary member 3 is applied. A safety device for a treatment table comprising a switch means 4 for detecting movement. 2. The device according to claim 1, wherein the movement of the seat 1 and/or the backboard 2 is stopped by a detection signal from the switch means 4. 3. The device according to claim 1, wherein the detection signal from the switch means 4 brings the seat 1 and/or the back plate 2 into a holding state until an obstacle is removed by a reciprocating motion with a small amplitude.