JPH0653133B2 - Dental treatment chair - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dental treatment chair having a chair back portion and a chair leg portion which can be swung forward and backward of a chair seat portion, and particularly relates to undulation of the chair back portion. The present invention relates to a dental treatment chair in which a chair seat part is tilted and a chair leg part is tilted in conjunction with.

(Prior Art) Conventionally, in the up-and-down motion of a dental treatment chair (standing up and tilting), a device for raising and lowering a chair seat portion to a height suitable for treatment, a device for raising and lowering a chair back portion, and a chair back portion. There is a need for a tilting device that tilts the chair seat portion in an inclined state to keep the patient's posture in a comfortable state.

For this reason, the conventional dental treatment chair is provided with a vertically moving device, a tilting device, and a back plate undulating device that can be operated independently of each other, and selects these to make the posture suitable for the treatment of the operator and the patient. To maintain a comfortable posture.

(Problems to be Solved by the Invention) However, in order to smoothly perform the up / down motion of the chair back, the up / down motion of the chair leg, and the vertical tilt motion of the chair seat leg, the above-mentioned various The independent incorporation of electromechanical devices not only complicates the structure of the treatment chair, but also increases the manufacturing cost, which is an obstacle to providing a convenient treatment chair.

Also, in order to obtain a comfortable posture for the patient, it is necessary to keep the height of the nose and knee of the patient horizontal, and tilt the chair seat to the extent that the back of the chair is tilted to raise the knee of the patient. Must. However, operating the various devices independently means raising and lowering the chair back, tilting the chair seat,
Not only does it make it difficult to smoothly raise and lower the chair legs, but the patient's comfortable posture is temporarily disrupted.

(Means for Solving Problems) The present invention has been made in view of the above problems,
It is designed to smoothly perform the tilting motion of the chair seat part 1 and the tilting motion of the chair leg part 3 in conjunction with the ups and downs of the chair back part 2, that is, (1) a chair pivotally mounted on the chair elevating part 4. In a dental treatment chair in which a back portion 2 and a chair leg portion 3 are provided in front and rear positions of a seat portion 1, and the chair back portion 2 is configured to be capable of being raised and lowered by the operation of a drive source 4 ', a chair back rotation axis 2 of the chair back portion 2 is provided.
A chair back is formed by providing a long rod 2e, one end of which is pivotally attached to the base end of the chair back portion 2 at a position slightly distant from a, and the other end of which is pivotally attached near the base of the chair leg portion 3. 2. A dental treatment chair in which the chair leg 3 is raised and lowered in conjunction with the ups and downs of the chair, and (2) Positioned in the front and rear position of the chair seat 1 pivotally mounted on the chair elevating part 4. The back 2 and the chair leg. In the dental treatment chair including the portion 3 and the chair back 2 which can be raised and lowered by the operation of the drive source 4 ', a base end of the chair back 2 at a lower portion of the chair back 2 slightly separated from the chair back rotation axis 2a. A tilt rod 2f having one end pivotally attached to the chair, a crank 2g having one end pivotally attached to the middle of the chair lift 4 and a link 2h having one end pivotally attached to the front lower frame of the chair seat 1 The other end of the rod 2f and the crank 2
A tilting device is provided that pivotally supports the other end of g and pivotally supports the other end of the link 2h in the middle of the crank 2g. The front of the chair seat tilts in conjunction with the ups and downs of the chair back 2. The dental treatment chair is characterized in that

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, by providing the long rod swivel shaft 2b on the chair back 2 and the long rod connecting shaft 3g on the chair leg 3, respectively, the swivel motion of the chair back swivel shaft 2a is seated. The chair leg 3 is turned up and down by converting it into a turning motion of the chair leg 3 through the long rod 2e that moves in the hand direction.

The long rod 2e is composed of a cylinder portion 6 and a rod portion 7 that slides inside the long rod 2e, and even if the operator's foot or the like is caught during the ups and downs of the chair leg portion 7, the rod portion 7e Can be extended to ensure patient safety. Further, by tensioning the tension spring 5 between the cylinder portion 6 and the rod portion 7 of the long rod 2e, the rod 12 is extended and the safety of the patient can be ensured and when the operator's foot is removed. By the restoring force of the tension spring 5, the chair leg portion 3 is continuously returned to the upright state to bring the chair leg portion 3 into the vertical state and the chair leg portion 3 can be stably held.

In the dental treatment chair of the present invention, the back side of the chair seat portion 1 is used as the lifting / lowering part turning shaft 4a on the chair lifting / lowering part 4 and the leg side thereof is seated via the crank 2g and the link 2h of the chair lifting / lowering part 4. The pivoting shaft 1a is pivotally attached to the tilting pivot shaft 1a, and the crank 2g is pivotally supported on the tilting rod pivot shaft 2c via a tilt rod 2f that moves in the seat longitudinal direction. When turning upright (upright → tilting), the crank 2g is swung through the tilt rod 2f, and this swiveling motion is swung by the link 2h. Instead of the circular motion of 1, the leg portion side of the chair seat 1 is tilted up and down.

(Operation) The operation principle of the dental treatment chair of the present invention will be described below with reference to FIG.

The up-and-down swivel motion of the chair back 2 around the swivel shaft 2a of the chair is converted into the swivel motion around the swivel shaft 1b of the chair leg 3 through the long rod 2e that moves in the seat longitudinal direction. By doing so, the chair leg 3 is swung up and down (vertical → horizontal)
Can be made.

By providing the cylinder portion 6 and the rod portion 7 that slides inside the long rod 2e in the middle of the long rod 2e, when the operator's foot is caught while the chair leg portion 3 is being tilted, the rod portion 7 Can be extended to ensure patient safety. In addition, the long rod 2e
After stretching the rod 7 by stretching the tension spring 5 between the cylinder portion 6 and the rod portion 7 and ensuring the safety of the operator, the chair leg portion is restored by the restoring force of the tension spring 5. It is possible to keep the chair leg portion 3 stable while raising and lowering the chair 3 continuously to be in a vertical state.

A crank 2g centered on a crank pivot 4b of the chair lift 4 via a tilt rod 2f that moves the chair back 2 around a tilt rod pivot 2c in the seat longitudinal direction.
This swinging motion is converted into an arcuate motion centering on the chair lifting / lowering unit swivel shaft 4a by a link 2h connecting the crank 2g and the chair seat swivel shaft 1a, and the leg of the chair seat 1 is converted into a circular motion. The part side can be tilted up and down.

As described above, in the dental treatment chair of the present invention, only the drive source such as one cylinder 4'and its mechanical transmission mechanism raises and lowers the chair back portion 2, tilts the chair seat portion 1 and raises the chair leg portion 3. The tilting motion can be performed smoothly and reliably, and the patient can be comforted even during a long-term treatment.

(Example) An example of the dental treatment chair of the present invention will be specifically described below with reference to the drawings.

FIG. 1 is an elevation view showing a tilted state of the dental treatment chair of the present invention, FIG. 1 is a plan view of FIG. 1, and FIG. 2 is an elevation view showing a state of the dental treatment chair of the present invention being tilted. FIG. 3 is an elevational view showing a standing state of the dental treatment chair of the present invention, FIG. 3 is a side view of FIG. 3, FIG. 4 is a sectional view showing a structure of a long rod, and FIG. 5 is a chair. It is a principle view explaining a tilt mechanism of a seat portion.

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, a chair back swivel shaft 2a before and after the chair seat part 1 and a chair. A chair back portion 2 and a chair leg portion 3 are respectively attached to the leg rotation axis 1b.
It is composed of a skeleton part that is pivoted, and an appropriate cushion material or cover material that covers the periphery thereof.

1 to 3, the dental treatment chair of the present invention is
A long rod swivel shaft 2b arranged rearward of the lower part of the chair back swivel shaft 2a, a long rod 2e pivotally supported by the long rod swivel shaft 2b and moving in the seat longitudinal direction, and the long rod. It is composed of a long rod connecting shaft 3g which is pivotally supported by 2e and which transforms the moving motion in the longitudinal direction of the seat part into a swinging undulating (vertical → horizontal) motion about the chair leg swinging shaft 1b.

The dental treatment chair of the present invention includes a drive cylinder 4'which is rotatably supported at the lower rear of the chair back rotation axis 2a of the chair back 2, and which raises and lowers the chair back 2 (standing-> tilting) and the chair back 2. A tilt rod swivel shaft 2c for converting the motion into an arcuate swivel motion centering on the chair back swivel shaft 2a, and a pivot shaft connected to the tilt rod swivel shaft 2c and a crank swivel shaft 4b in the middle of the chair elevating part 4 Crank 2g, link swivel shaft 4d axially mounted in the middle of the crank 2g, and link swivel shaft 4d
And a link 2h which is connected between the chair seat pivot shaft 1a and converts an arcuate movement of the link pivot shaft 4d into a vertical movement motion about the chair lift pivot shaft 4a.

Next, the raising and lowering mechanism of the chair leg portion 3 will be described. First, when the chair back 2 is raised and lowered (standing up and tilted), the long rod swivel shaft 2b swivels around the chair back swivel shaft 2a, and the long rod 2e pivotally supported by the long rod swivel shaft 2b becomes the seat length. The chair is moved in the hand direction, and the long rod connecting shaft 3g pivotally supported by the long rod 2e is changed to a swivel (vertical → horizontal) movement around the chair leg swivel shaft 1b of the chair leg portion 3 to change the chair. The leg portion 3 can be tilted up and down in a horizontal state.

In FIG. 4, by providing a cylinder portion 6 and a rod portion 7 that slides in the cylinder portion 6 in the middle of the long rod 2e, even when a surgeon's foot or the like is caught while the chair leg portion 3 is up and down, The rod portion 7 can be slid and extended to ensure patient safety. Further, by tensioning a tension spring 5 between the cylinder portion 6 and the rod portion 7 of the long rod 2e, the rod 1
After 2 slides and stretches to secure the operator's safety, the chair leg 3 is subsequently tilted (horizontal → vertical) by the restoring force of the tension spring 5 to return to the vertical state and stabilize. Can be held.

The tilt mechanism of the chair seat portion 1 will be described with reference to FIG. When the eccentric shaft of the chair back portion 2 is expanded and contracted by a driving source such as a cylinder 4'to raise and lower the chair back portion 2 (standing up and tilting), the tilt rod turning shaft 2c causes the chair back turning shaft 2a.
The chair lifting / lowering part 4 is rotated about the center of the chair, and the tilt rod 2f pivotally supported by the tilt rod turning shaft 2c is moved in the longitudinal direction of the seat.
The crank 2g pivoted on the crank turning shaft 4b of the above is turned. Then, by the link 2h that converts the swinging motion of the crank 2g into the vertical moving motion, the leg side of the chair seat 1 is replaced by the swing motion of the chair seat 1 about the chair lifting part swivel axis 4a. It can be tilted up and down.

At this time, the reduction relationship between the swivel angle of the chair back 2 (about π / 2) and the undulation angle of the chair seat is that the swivel angle of the chair back swivel shaft 2a, the crank swivel shaft 4b, and the chair lift swivel shaft 4a and the swivel angle. From the equivalence relation expressed by the product of the radii, it becomes as follows.

(Turning radius of chair back 2) × (Turning radius of internal division point 4d of crank 2g) / (Turning radius of crank 2g) ² × (Turning radius of chair seat 1) Thus, the dental treatment of the present invention As for the chair, the chair back 2 can be raised and lowered only by a drive source such as one cylinder 4'for raising and lowering the chair back 2 and its mechanical transmission mechanism, and the leg side of the chair seat 1 is moved up and down in conjunction with it. The chair leg 3 can be tilted and the chair leg 3 can be tilted up and down.

(Effects of the Invention) As described in detail in the embodiments and the like, the present invention provides a long rod turning shaft disposed rearward of a lower portion of a chair back turning shaft, and a seat portion longitudinally supported by the long rod turning shaft. Of the chair leg that moves in the direction and the movement of the seat in the longitudinal direction of the chair that is connected to the long rod is converted into a swinging undulation (vertical → horizontal) movement about the chair leg swing axis. By providing the long rod connecting shaft, it is possible to safely and reliably perform the undulating motion of the chair back and the up and down motion of the chair leg that is linked to the undulating motion of the chair only by the drive source such as one cylinder and the long rod.

In addition, a chair lifting / lowering unit pivoting axis that pivots on the back side of the chair seat, a tilt rod that changes the ups and downs of the chair back into movement in the seat longitudinal direction, and a crank that changes the movement of the tilt rod into up and down movements. Also, by providing a link pivotally supported at the internal division point and a chair seat pivoting shaft that is connected to the link and converts the tilt motion of the chair seat to the tilt motion of the chair seat. In other words, the dental treatment chair can be set smoothly and surely by using only one drive source and its mechanical transmission mechanism.

[Brief description of drawings]

FIG. 1 is an elevation view showing a tilted state of the dental treatment chair of the present invention, FIG. 1 is a plan view of FIG. 1, and FIG. 2 is an elevation view showing a state of the dental treatment chair of the present invention being tilted. FIG. 3 is an elevational view showing a standing state of the dental treatment chair of the present invention, FIG. 3 is a side view of FIG. 3, FIG. 4 is a sectional view showing a structure of a long rod, and FIG. 5 is a chair. It is a principle view explaining a tilt mechanism of a seat portion. 1 ... Chair seat part 1a ... Chair seat part pivot axis, 1b ... Chair leg part pivot axis, 2 ... Chair back part, 2a ... Chair back part pivot axis, 2b ... Long rod pivot axis, 2c ... … Tilt rod rotation axis, 2
e: long rod, 2f: tilt rod, 2g ... crank, 2h
…… Link, 3 …… Chair leg, 3g …… Long rod connecting shaft,
4 ... Chair lift part, 4 '... Cylinder, 4a ... Chair lift part pivot, 4b ... Crank pivot, 4c ... Crank connecting axis, 4d ... Link pivot, 5 ... Tension spring, 6
…… Cylinder part, 7 …… Rod part

Claims (4)

[Claims] 1. A chair back portion 2 and a chair leg portion 3 are provided at front and rear positions of a chair seat portion 1 pivotally mounted on a chair lift portion 4, and the chair back portion 2 is constructed so as to be able to be raised and lowered by the operation of a drive source 4 '. In the dental treatment chair described above, one end is pivotally attached to the base end portion of the chair back portion 2 at a lower portion of the chair back portion 2 which is slightly away from the chair back rotation axis 2a, and the other end is near the base portion of the chair leg portion 3. A dental treatment chair, characterized in that a long rod 2e pivotally attached is provided so that the chair leg 3 is raised and lowered in conjunction with the ups and downs of the chair back 2. 2. A long rod 2e has a cylinder portion 6 in the middle thereof.
The dental treatment chair according to claim 1, further comprising a connecting portion including a rod portion 7 slidably fitted in the cylinder portion 6. 3. A long rod 2e comprises a cylinder portion 6 and a rod portion 7.
The dental treatment chair according to claim 1 or 2, wherein the tension spring 5 is stretched between the two. 4. A back seat 2 and a chair leg portion 3 are provided at the front and rear positions of a chair seat portion 1 pivotally mounted on a chair elevating portion 4, and the chair back portion 2 can be raised and lowered by the operation of a drive source 4 '. In the dental treatment chair, the tilt rod 2f having one end pivotally attached to the base end portion of the chair back portion 2 at a position slightly separated from the chair back rotation axis 2a of the chair back portion 2 and one end in the middle portion of the chair lifting portion 4. Is provided with a crank 2g and a link 2h having one end pivotally attached to the front lower frame of the chair seat 1, and the other end of the tilt rod 2f and the other end of the crank 2g are pivotally supported. A dental treatment chair characterized in that a tilting device constituted by pivotally supporting the other end of the link 2h is provided midway, and the front of the chair seat is tilted in conjunction with the ups and downs of the chair back 2.