CN1003349B - dental chair - Google Patents

Abstract

A dental treatment table comprises a cushion, a tiltable backrest added on the cushion, and an operating mechanism of the tiltable backrest. And an instrument table capable of keeping horizontal lifting when the backrest is inclined, wherein the instrument table is connected to the backrest through a longitudinal shaft and a support shaft. And can rotate freely in the horizontal plane. With this structure, regardless of the inclination of the backrest, the dentist can be positioned to easily access the treatment instrument and face the instrument table.

Description

Dental chair

The invention relates to a dental chair.

It is well known that in dental treatment, it is necessary to adjust the movable dental chair and place various treatment tools, medicines and dental instrument tables at any time corresponding to the mouth position of a patient and the operation position of a dentist.

The instrument table can be a treatment table which is arranged on a dental chair and can axially slide relative to the chair back and move on a horizontal plane, and can also be a cross-arm type treatment table supported by a rod erected from the side surface of the dental chair or a cantilever extending from a wall.

Such dental chair-mounted treatment tables are limited to horizontal dental chairs and are apparently not structurally adapted to chairs in which the back rest is tiltable. In addition, the cross arm instrument table, while vertically adjustable, does not provide patient comfort because the arm rest is positioned above the patient's side of the chair, preventing the patient from getting on or off the dental chair.

The object of the present invention is to solve the above problems by a unique structure in which the instrument table can be moved vertically and rotated in a linked relationship with respect to a horizontal plane by tilting the backrest while being in a horizontal position.

Embodiments of the present invention are described in detail below with reference to the accompanying drawings.

FIG. 1 is an axial cross-sectional view of an embodiment of the present invention.

Fig. 2 is a plan view of the embodiment of fig. 1.

Fig. 3 and 4 are axial cross-sectional views of other embodiments of the present invention, respectively.

The dental chair a of the present invention comprises a seat a, a backrest b tiltably fixed to the seat a, and an operating means c for tilting the backrest b.

The dental chair a comprises an instrument table 1. The connecting rods 25, 25 are mounted in the instrument table 1 so as to be rotatable relative to the backrest b by means of thepins 23, so that the angle of incidence α with the axis of the connecting rod 25 remains constant at all times, even when the backrest is tilted, and the horizontalswivel arm 13 is connected to the connecting rod 25 by means of the longitudinal axis 11, and so that the instrument table 1 at one end of theswivel arm 13 can be swiveled in a horizontal plane about thesupport shaft 12. Thus, even when the backrest b is inclined, the instrument table 1 can be kept horizontal, so that an operator can take various dental tools on the instrument table at proper positions and always face the instrument table. In fig. 1, the lower end of the backrest b is connected to the frame a of the seat cushion a via a transverse shaft 21₁On the rear end.

Length l betweenpins 23 and 24₁Equal to the length between the transverse axis 21 and the pin 22, and two lengths l₁And l₃Are parallel. The substantially parallel linkage 2 comprises connectingrods 25 and 26, a frame a and a backrest b.

In fig. 2, a horizontal arm 27 extending from one side of the backrest b is fixed to the upward swinginglink 26 in the parallel link mechanism 2. A horizontally rotatableswivel arm 13 is connected by a horizontal shaft 11 to one end of the arm 27. Another horizontal rotating arm 14 with a horizontal instrument table is rotatably connected to one end of the rotatingarm 13 through the upright 12.

Also, as can be seen in FIG. 1The backrest b is composed of a piston rod C on a hydraulic cylinder C₁Is supported at one end. (means for operating the inclination of the backrest) A hydraulic cylinder C is installed on one side of the seat cushion a by means of a piston rod C₁The backrest b can be tilted about a transverse axis 21 when the cartridge C is extended and withdrawn.

Thus, when the operating mechanism C is operated and the parallel link mechanism 2 is operated, the backrest b can be tilted with respect to the seat cushion a. The incident angle α of the connecting rod 25 is kept constant while the instrument table 1 horizontally supported by the connecting rod 25 is kept horizontal, and the instrument table 1 horizontally supported by the connecting rod 25 can be raised or lowered while being always in a horizontal state.

The relationship of the up-down positions of the instrument table 1 and the headrest d depends on the position of the connecting rod 25 in the parallel linkage 2 and the incident angle of the backrest b. However, theinstrument stand 1 is installed by setting the connecting rod 25 as high as possible so that the instrument stand approaches the headrest d as close as possible when the backrest b is lifted, as long as it does not interfere with other components installed in the backrest b. The instrument table 1 may even be raised above the chair surface so that dental instruments and medications (not shown) can be placed thereon. On one side of the instrument table 1 there is also ahook 15 for hanging various instruments (not shown).

In the dental chair a described above, even if the backrest b is moved from the horizontal position to the raised position, or from the raised position to the horizontal position, respectively, the instrument table 1 is kept horizontal by the horizontal arm 27 fixed to the connecting rod 25 and thehorizontal rotation arm 13, because the angle of incidence α of the connecting rod 25 is always kept constant. Thus, when the backrest b is moved upward to the raised position, the instrument table 1 is automatically raised upward, and when the backrest b is moved to the horizontal position, the table 1 is automatically moved downward, which enables the instrument table 1 to maintain the position corresponding to the height of the headrest d.

In addition, the instrument table 1 is rotatable in a horizontal plane by means of the longitudinal axis 11 and the support shaft rest. Therefore, when the backrest b is swung down to make the patient receive treatment in the horizontal position, the patient keeps the horizontal posture, and the operator can conveniently place the instrument table at the hand-gathering place, or rotate the rotatingarm 13 or swing the horizontal arm 14 to push the instrument table 1 away. The effects described above are obtained even when the back b is raised so that the patient is in the upward position, the treatment is taken on the cushion a in a sitting position, the doctor is standing at an angle of 45 ° apart relative to the position of the patient from and in one position (e.g. 12 o ' clock, minute and hour positions-the doctor standing behind the patient's head) to (the doctor standing at the right of the patient, as in the case of the clock minute and hour positions at 9 o ' clock) or vice versa.

If the surgeon changes its operation position and posture to suit the posture of the patient to be inclined upward and downward depending on the treatment type, theinstrument stand 1 can always be supported at the same height with respect to the patient's mouth and can be easily put in a proper position with respect to the operator. In addition, the doctor can do this without any effort and without having to move his body and bend his knees, if necessary using tools on the instrument table, drugs and dental instruments suspended on thehooks 15. Thus, the doctor can improve the treatment efficiency and greatly reduce the fatigue.

Furthermore, because there is no conventional arm support above the patient, the apparatus table of the present invention has the additional advantage that the patient does not experience discomfort and is comfortable to treat.

Incidentally, at the pivot point of thesupport shaft 12 of therotary arm 13 and the horizontal rotary shaft 14, there is a handle 121 for fine adjustment of the up-down position of the instrument table 1.

Twoequal length links 201 and 202 are axially connected bypins 2011 and 2021, respectively. A link 203 of a length equal to the intercept betweenpins 2031 and 2032 is axially coupled bypins 2031 and 2032 to the lower ends oflinks 201 and 202, forming alink 202 and 203 and frame a under cushion a₁Theparallel link mechanism 200 is constructed. One end of the link 26 'is axially connected to the swing end of the link 25 by a pin 24, and the other end of the link 26' is axially connected to one ends of thelink 201 and the link 203 by apin 2031. In practice, a parallel linkage 2 'is formed in the backrest b, which is formed by the connecting rods 25, 26', 203 and the backrest b together. The link 203 connects the twoparallel linkages 2' and 200 to form the dualparallel linkage 20.

One side of the backrest b is provided with a groove 3. Frame a fixed on cushion a₁A transverse shaft 21 at the rear end is a sliding fit in the groove 3. Due to the combined control of the action of the control device C and the action of the double-link mechanism and the sliding of the transverse shaft 21 along the slot 3, the backrest b tilts relative to the seat cushion and keeps the instrument table 1 in a horizontal state.

A hydraulic cylinder C (an operating mechanism of a reclining backrest) is mounted on a lower portion of the seat cushion a, and a rod end C of the hydraulic cylinder C₁Axially connected tolinks 202 that constitute theparallel linkage mechanism 200. When piston rod C on hydraulic cylinder₁In operation, thedual link mechanism 20 tilts the seat back b in response to the transverse shaft 21 sliding in the slot 3.

Since the links 25 maintaining the instrument table 1 are not merely parallel₃Segment and at the same time it is fixed to the seat cushion a so that the angle of incidence of the link 25 is always constant when the backrest b is inclined.

In addition, as described above, the instrument table 1 horizontally supported by thehorizontal rotation arm 13, the horizontal rotation arm 14, the longitudinal shaft 11 and thesupport shaft 12 can move up and down, and also can freely rotate in a horizontal plane in a state of being kept horizontal even when the backrest is inclined.

In the first embodiment, since the backrest b is pivotally tilted about the lateral axis 21, the center of tilt on the seat (about the lateral axis 21) can be formed to prevent sudden sliding of the back with respect to the backrest b in a patient who is not sensitive to the tilt of the backrest b who is seated on the backrest b. In addition, when the patient sits on or rises from the seat cushion a, the lateral shaft 21 extending out of the seat cushion a is used as an armrest, which may be in the way.

The structure of the second embodiment is such that, externally, the hydraulic cylinder C is driven by the action of the twoparallel linkages 2' and 200, also called doubleparallel linkage 20, to slide the rear part of the seat cushion a along the slot 3. The seat itself has no center of inclination, and the lower end of the backrest b is raised as if it is lifted from the lower portion of the cushion a and when it is inclined downward, it is lowered as if it is lower than the cushion a. As a result, the sliding between the patient's back and the backrest b is compensated for by this tilting method. And no object protrudes from the surface of the seat cushion a. Thus, the second embodiment is functionally superior to the first embodiment as a treatment chair.

Furthermore, the slot 3 can be made as an arc-shaped slot with a curved center at one side of the chair, so that the backrest b can be easily tilted with the movement of the patient's back.

Fig. 4 is another embodiment of the present invention, but without the parallel linkage 2 of the first embodiment. The operating mechanism 4 differs in that the hydraulic cylinder connected to the connecting rod 25 is mounted in the lower part of the backrest b. The operating mechanism 4 makes the inclination of the operating mechanism C relative to the relatively tiltable backrest b on the connecting rod 25 constant. Accordingly, the hydraulic cylinder C moves in an interlocking relationship with the hydraulic cylinder as the reclining backrest b. And a hydraulic cylinder C₁The hydraulic cylinder is reciprocated. The instrument table 1, which is horizontally supported by the link 25 via thehorizontal rotation shaft 13, the longitudinal shaft 11 and thesupport shaft 12, is freely moved up and down and rotated in the horizontal plane while maintaining the horizontal state. Even when the backrest b is inclined, the instrument table is accordingly functionally equivalent in the same way to the other embodiments described and illustrated above.

Also, in the above described embodiment, the parallel link mechanisms 2 and 2', or the hydraulic cylinder 4, are assembled into the backrest b. These components can also be mounted on the side of the backrest b so that they operate in a similar manner. The operating mechanism C for tilting the backrest in the embodiment shown is a hydraulic ram, and commonly used operating mechanisms such as electric motors, shaft and cylinder combinations may be used.

As described above, in the present invention and dental chair, even if the doctor changes his treatment position and posture in accordance with the inclination of the backrest, the instrument table can be automatically moved not only to the height of the patient's mouth while keeping it horizontal, but also to a position convenient for the doctor to operate, with the result that the doctor can adapt to the treatment state of the inclination of the backrest without bending his knees or bending his body, and can more easily take out tools, medicines and various kinds of treatment instruments on the instrument table.

In this way, the doctor can treat the disease very smoothly and avoid fatigue. In addition, the patient can be treated comfortably without discomfort, and the dental chair is very practical and has the advantages of high efficiency and the like, as described above.

Claims (5)

1. A dental chair comprising a seat (a), a backrest (b) inserted obliquely into the seat (a), a headrest (d) and a drive means (c) for tilting the backrest (b), said dental chair being characterized in that: the chair also comprises an instrument table (1) connected to the backrest (b) adjacent to the headrest (d), the instrument table (1) is provided with a connecting rod (25) which can rotate in a vertical plane relative to a backrest (b), and fixed to the backrest (b) by means of a pin (23), said connecting rod (25) always maintaining a constant angle of incidence (a) with the axis of the connecting rod (25), even when the backrest (b) is inclined, so that by connecting the horizontal swivel arm (13) to the connecting rod (25) on the vertical axis (11), and the instrument table (1) at the end part of the rotating screw arm (13) can rotate around the supporting shaft (12) in the horizontal plane, therefore, even when the backrest (b) is inclined, the instrument table (1) is horizontally supported so that the operator can conveniently access various dental tools on the instrument table and is in a position relative to the instrument table.

2. The dental chair according to claim 1, wherein the lower end of said backrest is connected to the lower end of the chair frame by a transverse shaft, and a link 26 is rotatably connected to the swinging end of the link 25 by a pin 24, and the other end of the link 26 is axially supported by the frame rear end of the cushion by a pin 22, and the length between the pin 23 and the pin 24 is equal to the length between the transverse shaft 21 and the pin 23 and is kept horizontal, whereby a substantially parallel link mechanism [ 2 ] comprising the link 25, the frame and the backrest can be constructed in such a manner that the inclination of the backrest with respect to the cushion is accomplished by the operation of an operation mechanism for tilting the backrest together with the parallel link mechanism [ 2 ] for keeping the horizontal up-and-down movement of the instrument table.

3. The dental chair according to claim 1, wherein the links 201, 202 of equal length to each other are axially connected by pins 2011, 2021, respectively, and the link 203 of length equal to the distance between the pins 2011 and 2021 is confined between the links 201 and 202 and is axially connected by pins 2031 and 2032 to form a substantially parallel linkage 200 including the links 201, 202, 203 and the lower frame of the seat cushion, and one end of the link 261 is axially connected to the swing end of the link 25 by a pin 24, and the other end of the link 261 is connected to the lower end of the link 201 and one end of the link 203 by a pin axis 2031, thus forming a substantially parallel linkage 2 ' including the links 25, 26 ', 203 and the upper back of the seat back in such a manner that the links 2 ' and 200 parallel to each other are connected by the third rod 203 to form a double parallel linkage and a groove is formed on one side of the back, the back rest can be tilted relative to the seat cushion by slidably fixing a cross shaft fixed to a frame at the rear of the seat cushion in a groove, and the device can be raised and lowered while keeping the horizontal position under the control of an operating mechanism for tilting the back rest in cooperation with a double parallel link mechanism and the cross shaft acting relative to the groove.

4. The dental chair according to claim 1, wherein an operating mechanism connected to the lever mechanism 2 is installed in the seat cushion, said operating mechanism being adjusted so that it cooperates with the link mechanism 2 so that the angle of incidence on the link is constant.

5. The dental chair of claim 1, 2, 3 or 4 wherein the instrument table has hooks for hanging various dental instruments.

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