JPH0822299B2 - Dental treatment 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 having a chair back and a chair leg which can be swung back and forth around a chair seat, and more particularly to a chair leg which is interlocked with the undulating motion of the chair back. The present invention relates to a dentistry chair to be undulated.

[0002]

2. Description of the Related Art Conventionally, in raising and lowering (standing-up and tilting) of a dental treatment chair, a chair back and chair legs are simultaneously changed to a swinging and raising and lowering movement by sliding on a screw rod using a drive source such as a motor and a cylinder. At the same time, it has been proposed to electrically control a separate motor to extend and contract the chair leg.
In addition, there is also proposed a chair which is provided with safety measures when it malfunctions or expands or contracts when the chair leg is expanded or contracted.

[0003]

However, according to these prior arts, various driving sources are used for performing the up-and-down movement of the chair back and the chair leg as well as the extension and contraction movement of the chair leg in the front-rear direction. Was selectively operated to raise and lower the dental treatment chair. However, in order to perform a smooth and continuous undulating operation, various detectors and a complicated structure such as an arithmetic control circuit and a control mechanism therefor are required.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and converts the undulating motion of the chair back into the undulating motion of the chair leg by using a mechanical transmission mechanism, and at the same time, converts the chair leg into the undulating motion. Is capable of retracting and retracting in a safe and reliable manner, that is, a chair back portion 2 and a chair leg portion 3 are provided at front and rear positions of the chair seat portion 1 mounted on the chair lifting portion 4, and the chair back portion 2 is driven. In the dental treatment chair configured to be undulated by the operation of the source 4 ', one end is pivotally attached to the base end portion of the chair back portion 2 that is slightly below the base rotation axis of the chair back portion 2, and the other end is a chair. A long rod 2e pivotally attached near the base of the leg 3 is provided, and the long rod 2e includes a cylinder portion 11 and a rod portion 12 slidably fitted in the cylinder portion 11 in the middle thereof. Dentistry characterized by having a connecting part consisting of Is 療椅Ko. In addition, in the above-mentioned invention, the long rod 2e includes the cylinder portion 11 and the rod portion 1.
It is preferable that the tension spring 7 is stretched between the two.

The dental treatment chair of the present invention will be described below with reference to FIGS. 1 to 3. In the dental treatment chair of the present invention, the chair back portion 2 is provided with a long rod swing shaft 2b and a chair seat portion 1.
By providing a long rod connecting shaft 3g on the chair, the up and down motion of the chair back 2 is swung by the long rod 2e that moves the swivel motion of the chair back swivel shaft 2a in the seat longitudinal direction. Instead of the undulating motion, the chair leg portion 3 can be undulated (vertical → horizontal). The long rod 2e is composed of a cylinder portion 11 having a hole bored in the middle thereof and a rod portion 12 into which the cylinder portion 11 is loosely fitted. When pinched, the rod portion 12 is extended to temporarily stop the standing motion of the chair leg portion 3 to ensure the safety of the operator. Also, by tensioning the tension spring 7 between the cylinder portion 11 and the rod portion 12 of the long rod 2e, the operator's foot or the like is caught while the chair leg portion 3 is standing (horizontal → vertical). After the standing motion of the chair leg part 3 is stopped and the patient's foot is removed, the standing force is continued by the restoring force of the tension spring 7 and the chair leg part 3 can be stably held.

The chair leg portion 3 is provided with a telescopic link pivot shaft 1c provided at a position different from the chair leg pivot shaft 1b of the chair seat portion 1, a telescopic link 3a 'pivotally supported thereby, and a pivot support thereof. A slide link 3b 'that slides on a slide link sliding portion 3g', and from the chair leg pivot shaft 1b and the telescopic link pivot shaft 1c generated by the up-and-down (vertical → horizontal) motion of the chair leg part 3 The pulling force or the pushing force is generated based on the difference in the locus position on the radius of, and the slide link 3b 'is expanded and contracted by the pulling force or the pushing force. The chair leg portion 3 includes slide step rails 3'c on both sides of the step 3'a and slide step portions 3'b that slide on the slide step rail 3'c, and the chair leg portion is connected to a retractable mechanism. The structure is such that the slide step 3'b of the portion 3 is projected and retracted. A lever mechanism 3d 'for changing the expansion and contraction operation of the slide link 3b' to an expansion and contraction operation in the opposite direction, and the lever bar 3d '.
The slide step swivel shaft 3f for transmitting the expansion and contraction motion of the chair to the slide step 3'b and the auxiliary links 3c ', 3e' for smoothing the bending motion between the links, and the chair leg portion 3 are undulated (vertical → Then, the slide link 3b first expands and contracts, and then the lever step of the lever bar 3d 'is changed to an extension motion in the opposite direction, so that the slide step 3'b is extended and retracted from the chair leg 3 (stored). → Stretching) It is made to appear and disappear. Another retracting mechanism is a slide rack 8 connected to the slide link 3b ', and a pinion 9 in which a small diameter pinion and a large diameter pinion are coaxially fixed.
The slide step rack 10 is configured so that the slide step 3'b can be smoothly and surely moved in and out of the chair leg portion 3 in association with the undulating motion of the chair back portion 2 as described above. Other retractable mechanisms are a wire 5 connected to the slide link 3b ', a movable pulley 6 fixed to the step 3'a and coaxially fixing a small-diameter pulley and a large-diameter pulley, and the step 3'a and slide step. It is composed of a tension spring 7 stretched between 3'b, and when the slide link 3b 'is extended, the slide step 3'b is extended forward instead of the expanding and extending operation in the opposite direction by the moving pulley 6. When the slide link 3b 'is contracted, the slide step 3'b is restored by the restoring force of the spring 7.
Is stored in the rear. The other retracting mechanism is composed of the wire 5 connected to the telescopic link swivel shaft 1c, the constant pulley 6'for guiding the wire 5, the movable pulley 6 and the tension spring 7 configured as described above, and the chair leg. Even when a surgeon's foot or the like is caught during the standing (horizontal → vertical) operation of the portion 3, the tension spring 7 is a direct drive source when the slide step 3′b of the chair leg portion 3 is stored. Therefore, the storage operation can be temporarily stopped to ensure the safety of the operator.

[0007]

The operation principle of the present invention will be described below with reference to FIGS. By providing the cylinder portion 11 and the rod 12 that slides inside the long rod 2e, the operator's foot or the like is caught during the standing (horizontal → vertical) operation of the chair leg portion 3 and the chair leg portion 3 of the chair leg portion 3 is Even when the standing motion is blocked, the rod 12 can be loosely fitted inside the cylinder 11 to suspend the chair leg portion 3. Also, the cylinder part 1
After removing the operator's foot or the like by stretching the tension spring 7 between the rod 1 and the rod portion 12, the restoring force of the tension spring 7 operates and the slide step 3'b can be returned to the stored state. The chair leg portion 3 can be stably held.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the dental treatment chair of the present invention will be specifically described below with reference to the drawings. FIG. 1 is an elevational view showing a tilted state of a dental treatment chair according to an embodiment of the present invention, FIG. 1 is a plan view of FIG. 1, and FIG. 2 is an elevational view showing a state in which the dental treatment chair of this example is being tilted. 2, FIG. 2 is a plan view of FIG. 2, FIG. 3 is an elevation view showing a standing state of the dental treatment chair of this example, FIG. 3 is a side view of FIG. 3, and FIG. 4 is a configuration of a long rod. FIG. 5 is a principle view for explaining the operation of the retracting mechanism using a lever on the chair leg, and FIG. 5 shows the operation of converting the slide link extending and retracting operation of FIG. 5 into the slide step retracting operation. FIG. 5 is a principle diagram showing the operation of converting the swinging motion of the chair leg portion of FIG. 5 into a slide link expanding / contracting motion, and FIG. 6 is a slide link (FIGS. 1 to 3).
A schematic diagram showing a stored state of a slide step of a chair leg when using a slide rack connected to, a pinion or the like,
FIG. 6 is a schematic view showing an expanded state of the slide step of FIG. 6, and FIG. 7 is a slide link (FIGS. 1 to 3).
FIG. 7) is a schematic view showing a stored state of a chair leg slide step when a wire and a movable pulley connected to FIG. 7 are used, FIG. 7 is a schematic view showing an extended state of the slide step of FIG. 7,
FIG. 8 is a schematic view showing a stored state of a chair leg slide step when a wire, a constant pulley, and a movable pulley connected to the telescopic link pivot of FIGS. 1 to 3 is used, and FIG. 8
It is a schematic diagram showing the extension state of the slide step of the figure.

In the figure, a dental treatment chair includes a chair seat portion 1 pivotably mounted on a chair lift swivel shaft 4a at an upper end of a chair lift part 4 of a base and a chair back swivel shaft 2 before and after the chair seat part 1.
a and chair leg rotation axis 1b, and chair back 2 and chair leg 3
The periphery of a skeletal portion that pivots so as to be freely rotatable is configured to be covered with an appropriate cushion material, a cover material, or the like. 1 to 3, the chair leg undulation and expansion / contraction mechanism of the present invention includes a long rod swivel shaft 2b disposed below and rearward of the chair back swivel shaft 2a, and the long rod swivel shaft 2b. And a long rod 2e connected to the long rod 2e to move in the longitudinal direction of the seat, and a movement in the longitudinal direction of the seat connected to the long rod 2e for swinging up and down about the chair leg swivel shaft 1b (vertical → A long rod connecting shaft 3g which is changed to a horizontal movement, and a telescopic link swivel shaft 1c provided on the lower rear chair seat part 1 different from the chair leg swivel shaft 1b and connected to the telescopic link swivel shaft 1c. The swinging up / down (vertical → horizontal) motion of the chair leg swivel shaft 1b is changed to a pulling (or pushing (horizontal → vertical)) motion based on the difference in the locus movement position from the eccentric shaft (1c) in the radial direction of swivel. The expansion / contraction link 3a ′ and the pulling (or pushing) operation of the expansion / contraction link 3a ′ are applied to the chair. Slide link sliding portion 3 secured to Part 3
Slide link 3b 'that slides g'and changes to expansion and contraction operation
And the slide link 3b 'through the auxiliary link 3c'.
Is connected to the slide link swivel shaft 3c and is in the opposite direction (when the chair leg portion 3 is vertically undulated, the chair leg portion 3 is
A lever lever 3d 'for pivotally supporting the lever lever pivot shaft 3d at an external branch point position for changing to a pivoting movement in the direction of pushing the lever), and the lever rod 3d'.
Slide step turning shaft 3f fixed to the slide step 3'b by being connected to the auxiliary link turning shaft 3e, and a bendable auxiliary link 3 pivotally supported at both ends of the lever rod 3d '.
e ', slide step rails 3'c arranged on both sides of the step 3'a of the chair leg 3, and slide step rails 3'c for sliding the slide step 3'b Has been done.

In FIG. 4, a long rod 2e is composed of a cylinder portion 11 having an inside bored therein, a rod 12 slidable therewith, and a tension spring 7 stretching both of them.
Even when a surgeon's foot or the like is caught in the midway of the swing leg (horizontal → vertical) motion of the chair leg portion 3, the long rod 12
Can slide inside the cylinder 11 to temporarily stop the chair leg portion 3 to ensure the safety of the operator, and if the operator's foot or the like is removed, the tension spring 7 restores the force. The slide step 3'b can return to the housed state and can be stably held. In FIG. 5, the undulation and extension / contraction mechanism of the chair leg portion 3 will be described. First, when the chair back portion 2 is raised or lowered (standing up and tilted), the long rod swivel shaft 2b swivels about the chair back swivel shaft 2a, and the long rod 2e connected to the long rod swivel shaft 2b becomes the seat length. Move in the hand direction. And a chair leg portion 3 connected to the long rod 2e
The long connecting shaft 3g is changed into a swinging undulation (vertical → horizontal) motion about the chair leg swinging shaft 1b pivoted on the chair seat 1, and the chair leg 3 is made horizontal. By undulating the chair back portion 2 in this manner, the chair leg portion 3 can be smoothly and reliably undulated by only the mechanical transmission mechanism that is interlocked with the chair back portion 2. In addition, as the chair leg portion 3 rises and falls (horizontally or vertically), the retractable link pivot shaft 1 of the chair seat portion 1 is moved.
c and the slide link 3b 'of the chair leg 3 has an extension link 3a' which connects the extension link connecting shaft 3a to the chair leg turning radius (the chair leg turning shaft 1b in the vertical state of the chair leg 3). By sliding on the distance between the expansion link connecting shafts 3a), the slide link 3b 'is moved by the turning radius of the chair leg and the difference in moving distance of the expansion link connecting shaft 3a on the radius. For example, a telescopic link swivel axis 3a 'is provided on the back side on the vertical bisector of the chair leg swivel radius (distance between the chair leg swivel axis 1b and the telescopic link connecting axis 3a in the vertical state of the chair leg 3). When it is provided, the moving distance becomes maximum, and when the leg elastic link 3a 'is provided at the midpoint of the chair leg turning radius, it becomes 1/2 times the chair leg turning radius.

Then, the lever pivot 3d is moved to the step 3 '.
Auxiliary links 3c 'are attached to both ends of the lever rod 3d' that is pivotally attached to a.
The slide step 3 ′ ′ is connected to the slide step 3′b via the slide link 3b ′ and the auxiliary link 3e ′, and the linear movement of the slide link 3b ′ is changed to the expansion / contraction operation in the opposite direction by the slide step 3 ′ ′. The'b can be extended (or stored) from the chair leg portion 3 and can be made to appear and disappear. As shown in another retracting mechanism of FIG. 6, the slide rack 8 is attached to the slide link 3b ′ (FIGS. 1 to 3).
And the teeth of the slide rack 8 are meshed with the small diameter pinion of the pinion 9 formed by integrally fixing the small diameter pinion and the large diameter pinion, and the large diameter pinion of the pinion 9 is fixed to the slide step 3'b. By engaging with the slide step rack 10 that has been formed, the expansion and contraction operation of the slide link 3b 'is performed.
The chair leg portion 3 can be extended or stored instead of the expansion / contraction operation in the opposite direction. As shown in FIG. 7, the retracting mechanism connects the slide link 3b 'of the chair leg 3 and the small diameter sheave shaft portion of the moving pulley 6 pivotally attached to the step 3'a, and the small diameter sheave shaft. And a separate wire 5 that connects the large-diameter pulley shaft portion coaxially fixed to the base portion and the base end portion of the slide step 3'b, and the tension stretched between the step 3'a and the slide step 3'b. It is composed of a spring 7. Then, when the chair leg portion 3 is undulated (vertical → horizontal), the slide link 3b ′ is stretched to pull the wire 5, and the movable pulley 6 is changed to pull in the opposite direction, whereby the tension spring 7 is pulled. The slide step 3'b of the chair leg portion 3 can be extended against the urging force of the chair leg portion 3, and when the chair leg portion 3 is undulated (horizontal → vertical), the slide link 3b 'contracts. The slide step 3′b can be stored in the chair leg portion 3 by relaxing the wire 5 and the restoring force of the tension spring 7, and the slide step 3′b of the chair leg portion can be stored by a simple mechanism. Can be infested.

As shown in FIG. 8, the retractable mechanism is replaced with the retractable link 3a ', the slide link 3b' and the slide link sliding portion 3g 'in FIG. 7, and the retractable link swivel shaft 1c of the chair seat portion 1 is replaced. And a wire 5 that connects the small-diameter pulley shaft portions of the moving pulley 6 and a constant pulley 6'provided at the tip of the step 3'a. As in the above (FIG. 4), the up-and-down motion of the chair leg portion 3 can be replaced with the extension / contraction motion of the slide step 3′b of the chair leg portion 3, and the chair leg portion 3 can be constructed with a simpler mechanism. The slide step 3'b can be made to appear and disappear. As described above, the dental treatment chair of the present invention uses a drive source such as one cylinder 4'for undulating the chair back 2 so that the chair back 2 can be lifted.
By raising and lowering, the chair leg portion 3 can be raised and lowered in conjunction with this, and by the raising and lowering operation of the chair leg portion 3, the slide step 3'b of the chair leg portion 3 can be smoothly and surely expanded and contracted to appear. be able to.

[0013]

As described in detail in the embodiments and the like, according to the present invention, if the back of the chair is raised and lowered by a driving source such as a cylinder, the patient is temporarily anxious by a combination of a series of simple mechanical transmission mechanisms. When the chair leg can be erected smoothly and easily without causing the chair leg to stand up (horizontal → vertical) and the operator's foot is caught in the middle of the chair leg's standing motion (horizontal → vertical), and the chair leg standing motion is blocked. However, the rod can be loosely fitted inside the cylinder to suspend the chair leg. Further, after removing the operator's foot or the like caught by tensioning the tension spring between the cylinder portion and the rod portion, the restoring force of the tension spring operates and the slide step can be returned to the stored state. The chair leg can be stably held.

[Brief description of drawings]

1 is an elevation view showing a tilted state of a dental treatment chair according to an embodiment of the present invention, is a plan view of FIG.

FIG. 2 is an elevational view showing a state in which the dental treatment chair of the present example is in the process of tilting, is a plan view of FIG.

FIG. 3 is an elevation view showing a standing state of the dental treatment chair of this example, is a side view of FIG.

FIG. 4 is a sectional view showing the structure of a long rod,

5 is a principle diagram illustrating the operation of a retracting mechanism using a lever on a chair leg, FIG. 5 is a principle diagram illustrating an operation of converting a slide link extending / contracting operation of FIG. 5 into a slide step retracting operation, and FIG. Principle diagram showing the operation of converting the swing motion of the chair leg into a slide link expansion / contraction motion,

6 is a schematic view showing a stored state of a slide step of a chair leg portion when using a slide rack, a pinion or the like connected to a slide link (FIGS. 1 to 3), and FIG.
Schematic diagram showing the extended state of the slide step of

7 is a schematic view showing a stored state of a chair leg slide step when a wire and a pulley connected to a slide link (FIGS. 1 to 3) are used, and FIG. 7 shows an extended state of the slide step of FIG. Schematic diagram,

FIG. 8 is a schematic diagram showing a stored state of a chair leg slide step when a wire, a constant pulley, and a pulley connected to the telescopic link pivot of FIGS. 1 to 3 is used; Schematic diagram showing the stretched state

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Chair seat part, 1a ... Chair seat part turning axis, 1b ... Chair leg part turning axis, 1c ... Telescopic link turning axis, 2 ... Chair back part, 2a
... Chair back swivel axis, 2b ... Long rod swivel axis, 2c ... Tilt rod swivel axis, 2e ... Long rod, 2f ... Tilt rod, 2g ... Crank, 2h ... Link, 3 ... Chair leg, 3a ... Telescopic link Connecting shaft, 3b ... Slide link turning shaft, 3c ... Auxiliary link turning shaft, 3d ... Lever rod turning shaft, 3e ... Auxiliary link turning shaft, 3f ... Slide step turning shaft, 3g ... Long rod connecting shaft 3'a ... Step 3'b ... slide step, 3'c
… Slide step rails, 3a ′… Expandable links, 3
b '... slide link, 3c' ... auxiliary link, 3d '...
Lever rod, 3e '... Auxiliary link, 3g' ... Guide (sliding link sliding part), 4 ... Chair lifting part 4 '... Cylinder, 4a ... Chair lifting part swivel axis, 4b ... Crank swivel shaft, 4d ... Link swivel shaft 5 ... Wire, 6 ...
Moving pulley, 6 '... constant pulley, 7 ... tension spring, 8 ... slide rack, 9 ... pinion, 10 ... slide step rack,
11 ... Cylinder part, 12 ... Rod part

Claims (1)

[Claims] 1. A chair seat part (1) attached on a chair lifting part (4).
In the dental treatment chair in which the chair back 2 and the chair leg 3 are provided at the front and rear positions of the chair, and the chair back 2 can be raised and lowered by the operation of the drive source 4 ', a position slightly below the base rotation axis of the chair back 2. One end is pivotally attached to the base end of the back part 2 of the chair,
The long rod 2 whose other end is pivotally attached near the base of the chair leg 3
e, and the long rod 2e has the cylinder part 1 in the middle thereof.
1. A dental treatment chair characterized in that it has a connecting portion consisting of 1 and a rod portion 12 slidably fitted in the cylinder portion 11.