JPH08164173A - Chair for medical treatment,especially for dental treatment - Google Patents

Abstract

PURPOSE: To achieve improvement the movement of the back of a patient with respect to the rotation of a back rest as much as possible, while improving compatibility with a patient different in physical constitution in a chair for medical or dental treatment. CONSTITUTION: A chair 1 for medical or dental treatment has a seat 2 adjustable as much as possible, an adjustable back rest 4 and preferably an adjustable heat indicating part 8. The back rest 4 is made turnable about a joint shaft 6a by a first adjustor 7 extended horizontally and side ways with respect to the chair 1 for treatment and can be fixed at each turning position. The back rest is also movable in the longitudinal direction by a back rest collector 13 to prevent changes in relative position between the back rest 4 and the back of the patient even while it is rotating. The collector 13 automatically adjusts the back rest 4 along with the movement thereof.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a medical or dental chair according to the preamble of claim 10.

[0002]

BACKGROUND OF THE INVENTION Such treatment chairs have to meet two main requirements. That is, on the one hand, to provide the patient sitting or lying in that chair with a comfortable sitting or lying position, and on the other hand, the arrangement of the patient's body and the person involved in the treatment, especially the doctor, The position is to ensure safe and comfortable treatment.

A dental chair of this kind referred to in the introduction is a German patent application DE 30 48 804 (DE).
-3048804 A1). Associated with this known treatment chair is a back length correction device for preventing relative displacement between the back and the patient's back when pivoting the back. Such a compensator is necessary for a treatment chair in which the joint axis of the back joint extending horizontally across the treatment chair does not coincide with the joint axis of the patient's pelvic joint. The articulation axis of the patient's pelvic joint is located a certain amount above the sitting or lying surface of the treatment chair when the joint axis is positioned approximately equal to the sitting surface.

[0004]

Dental chairs have already been proposed in which the back joint axis coincides with the axis of the patient's pelvic joint and therefore no corrector is required. However, such treatment chairs have a concave structure on at least one side near the patient's pelvis, which makes it more difficult and stable for the patient to get on and off the treatment chair. It affects sexuality.

German Patent Application Publication No. 3048 mentioned above
In 804 (DE-3048804A1), the correction device is formed in the backrest. The backrest is mounted so as to be freely movable in the longitudinal direction on the backrest carrier. The back carrier is provided as a positioning device and is preferably formed using a spring to position the back on the back carrier in its intermediate position. In such a configuration, the body support is firmly attached to the patient's back so that it automatically moves as the backrest pivots. That is, it is moved downwards by a downward swing of the backrest and upwards by an upward swing. Due to the adjustment of the positioning spring described above, the body support is pushed backwards and is automatically returned to its intermediate position by the spring after the patient leaves the chair. No backrest length adjustment device for adapting the couch to patients of different sizes is provided in this known couch. It is possible to manually move the body support from its intermediate position upwards or downwards. However, since this known configuration is not intended to adapt the backrest to patients of different physiques, the effective range of movement of the body support is not sufficient for movement to compensate for physique. is there.

German Patent No. 3611400 (DE-
3611400 C1) describes a device for adjusting a dental chair so that the initial back length can be adapted to patients of different sizes. However, this known arrangement does not provide a backrest length compensation for backrest rotation.

It is an object of the invention to improve the suitability of a medical or dental chair of the type described in the preamble of claim 1 for patients of different size, and
The goal is to improve the movement of the patient's back relative to the rotation of the backrest as much as possible.

[0008]

[Means and Actions for Solving the Problems]
This is achieved by the features of claim 1. In the medical or dental chair according to the invention according to claim 1, the body support corresponds to the back carrier during the pivoting of the backrest, so that it fits or approaches the back of the patient. , Automatically moved in or out. As a result, the patient's back does not have to move for the effect transmitted to the body support, which improves the comfort of the treatment chair. In this way, the patient's back does not have to perform any adjustment work. The body pointing unit is automatically moved to each corrected position or especially the initial position. As a result, before or even in the intervening backrest,
It allows the patient's back to be raised from the back and then laid down again without returning or repositioning the body support. Thereby, it becomes possible to adapt the length of the seating and body holding portion to different physiques while ensuring this correction.

According to the present invention, the backrest length adjusting device is constructed integrally with the compensating device, or the backrest length adjusting device together with the compensating device comprises a compensating device whose movement is compensated and a backrest. It is possible and advantageous to place them side by side. In the solution according to the invention according to claim 2, actuation and / or control of the correction of the backrest length is achieved by pivoting the backrest, depending on its pivoting movement and / or pivoting angle. In the first case, no special drive motor is needed for correction. This is because the turning force and the movement used to rotate the backrest are used to perform the correcting movement. In the second case, the control of the corrective action is greatly simplified, whereby the drive motor for performing the corrective action may or may not be included. An important advantage of this arrangement is that the trajectory of the pivotal movement is used to control the corrective action, so that certain predetermined control parameters or values can be omitted.

The invention further relates to a medical or dental chair according to the preamble of claim 10, wherein German Patent No. 3611400 (DE-3611400 C1).
The scope of the related art is defined by Claim 1
The solution according to the invention according to 0 allows a quick manual adjustment and adjustment of the backrest for patients of different size. Also in this configuration, the cost for this treatment chair is significantly reduced both in terms of manufacturing and control. This will reduce the manufacturing cost considerably. Moreover, this treatment chair is less susceptible to failure and saves energy.

The above-mentioned three solutions according to the invention can each be advantageously applied in combination with at least one of the other solutions. The dependent claims include features which serve to solve the problems posed by the invention, which make them easier to construct and handle and provide a functional arrangement for longer life. Thereby, an improvement for automatic adjustment of the correction action is also achieved.

[0012]

The invention and the advantages achieved thereby are described below with reference to preferred embodiments and drawings. 1 is a perspective view of a treatment chair, in particular a dental treatment chair according to the invention.

FIG. 2 is a partially sectioned front view of the back of the treatment chair. FIG. 3 shows III-III of FIG.
FIG. The main components of the medical or dental chair 1 shown generally at 1 are the seat 2, the backrest 4, the head support 8, preferably the left armrest 12, the backrest compensator 13, and the backrest length. It is the adjusting device 14. The seat 2 is preferably a one-piece, in particular extended and integrally formed with the leg support 3. Backrest 4
Is connected to the seat 2 at the rear end of the support 2 by means of a backrest joint 6 having a joint axis 6a extending horizontally in the treatment chair 1. Furthermore, the backrest can be moved around its joint axis 6a between an upright sitting position and a position lying substantially horizontally by means of a first adjusting device 7 and can be fixed in each adjusted position. . In the head support 8, its support 9 is movably mounted on the backrest 4 by means of one or two transport rods 11 which move in the longitudinal direction of the backrest 4. Preferably the left armrest 12 is
In this embodiment, it is a part of the first adjusting device 7. The backrest correction device 13 adapts the back of the patient to the rotation of the backrest 4. Then, it is preferably formed integrally with the backrest 4. The backrest length adjustment device 14 is also integrally formed with the backrest 4, the length of which makes it possible to adapt to patients of different physiques.

The treatment chair 1 described above, or its seat 2, is provided on a carrier 15, preferably
A further adjusting device 16 formed integrally with the carrier 15 makes it possible to pivot about a joint shaft that moves in the horizontal and lateral directions of the treatment chair 1, and
It can be fixed in each rotated position. Further, the treatment chair 1 is installed so that its height can be adjusted. A further adjusting device 17 is provided for this purpose. It has a pivoting lever 19 which acts between the chair base 18 and the carrier 15 and preferably connects the carrier 15 to the chair base 18.

The treatment chair 1 is a part of a treatment facility having treatment instrument support portions 21 and 22 which are known per se and a mouth washer 23. The first adjusting device 7 comprises a drive motor 24 provided in the seat 2 for rotating, lying down and raising the backrest 4. The drive motor is coupled to the rod-shaped armrest support 25 using a reduction gear, especially a toothed gear. The armrest support portion 25 is provided on the seat portion 2 so as to be rotatable around a rotation axis extending in the horizontal direction of the seat portion 2 in the horizontal direction, and further, at the other end thereof, Is also connected to the armrest 12 by a joint 26 having a joint axis extending horizontally and laterally. The armrest extends substantially parallel to the seating surface 27 and is connected at its rear end with the backrest 4 by means of a joint 28 which also has a pivot axis extending horizontally and laterally. . As the armrest support 25 is pivoted around by the drive motor 24, the backrest 4 is preferably approximately 70 with respect to the horizontal plane.
Adjustable between an upright sitting position of ° and a substantially horizontal lying position, and to a selected intermediate position. Then, it can be fixed at each rotated position. Both of the limit positions described above are shown in FIG.

The backrest 4 has a backrest carrying section 4a and a body supporting section 4b. The backrest transport section 4a is joined to the seat section 2 by a joint 6 so as to rotate. The body support 4b is adapted to be adjusted in the longitudinal direction of the backrest 4 by means of a guide 31 arranged between these two components.
You will be guided inside. The backrest 4 can then be positioned by the correction device 13 at each adjusted position. The guide 31 is formed by two guide rods 31a, the guide rods of which are fixedly connected at their ends to the body support 4b, preferably a bridge-shaped backrest. The guide recess 31b of the transport unit 4a is provided so as to be freely movable.

The correction device 13 includes a push-pull coupling section 32.
Have. One end of the push-pull joint 32 is
It is rotatably connected to the seat 2 in the vicinity of the joint 6, and the other end is connected to the body support 4b. The coupling part 32 is preferably a rod 3 whose length is adjustable.
3, the rod of which extends in the longitudinal direction of the backrest 4 and is connected to the seat 2. In this case, the joint part 2a is used, and the joint part is connected to the seat part 2 at a position spaced apart from the joint shaft 6a in the radial direction. The joint part is in this configuration a circular mounting pin, which in this case is located in the through mounting hole 4c of the backrest carrier 4 formed by the mounting arm 4d. Both mounting pins 2a can be fitted internally, or preferably externally, into a mounting hole 4c provided in the mounting arm 4d. In this configuration, the installation pin 2a is arranged inside the installation arm 2c extending above the seat 2. The coupling shaft 2d is arranged at a position eccentric to the joint shaft 6a, thereby forming an eccentric portion 2e, to which the push-pull coupling portion 32 is rotatably provided. In the present configuration, the coupling shaft 2d is located in the rear semi-circular portion 2f below the joint component 2a of the joint 6 that engages with the seat portion 2.

The rod 33 is adjustable in length by means of a connection, which is preferably threaded, and in the present arrangement has the necessary play for movement, the longitudinal length in the associated mounting arm 4d. It extends in an oriented through hole 34 and is pivotally connected to the lever at its end remote from the joint 6. The lever is in particular a two-armed lever 35, which extends laterally and almost horizontally inwardly. Then, it is provided at a joint 36 provided between the arms 35a and 35b of the two levers so as to be freely rotatable substantially parallel to the backrest 4. In this configuration, the joint 36 is formed by the joint plate 37. Joint plate 37
Is connected to the backrest transporting section 4a and the lever 35 so that the joint shaft extends in the direction traversing the backrest 4 with the joint 36a at one end and the joint 36b at the other end. As a result, the joint plate
Suitably, it extends upwards from the backrest carrier 4a and the lever 35 is located on the side of the backrest carrier 4a remote from the joint 6. The open end of the lever arm 35b on the side away from the rod 33 is connected to the body support portion 4b.
It is rotatably connected to one or two connecting parts 38. The lever 38 is thus movably connected to the backrest carrier 4a in a substantially horizontal manner.

As can be seen in particular from FIG. 3, when the backrest 4 pivots downwards, the rod 33 moves towards the head support 8. Because the backrest transport section 4a
However, this is because the upper rear four semi-circle portion approaches the coupling axis 2d (see FIG. 3). As a result, the lever 35
Is rotated so that the arm 35b of the lever inside thereof faces downward. Then, by this arm, the body support portion 4b is moved in the direction of the position corrected to be lower.
When the backrest 4 is rotated upward, the body support portion 4b is driven in the opposite direction and is displaced upward toward the upward correction position. The body support 4b is also positioned by the correction device 13 at these end positions and also at all intermediate positions. In other words, the body support portion 4b is held against the displacement of the guide 31. No special driving force is required for these compensating movements. The turning and pivoting movements of the backrest 4 are used exclusively for their drive and control. The corrected movement amount of the backrest 4 and the control amount thereof are between the body support portion 4b and the back of the patient when the backrest 4 rotates around the joint axis 6a which is arranged lower than the joint of the pelvis of the patient. No relative movements occur, or almost none. That is, with respect to the back, the backrest transport section 4a influences relative movement, and the body support section 4b
It does not contribute to its relative movement. Because, body support 4
This is because the relative movement of b is corrected.

The backrest length adjusting device 14 is arranged continuously with the backrest correcting device 13. And in this structure, it is arrange | positioned between the backrest correction apparatus 13 and the body support part 4b. Thereby, the length of the backrest, or the radial distance of the body support portion 4b from the joint shaft 6a,
It is allowed to be adjusted independently of the correction device 13 and fixed at each adjusted position. In this configuration, the backrest length adjustment device 14 forms a connection (connection part 38) between the correction device 13 and the body support part 4b.

The backrest length adjusting device 14 can adjust its length continuously or stepwise, and can be fixed at each adjusted position. In the arrangement according to FIG. 3, several adjustments, for example three steps, are provided. The backrest length adjusting device 14 has a connecting rod 38. The connecting rod 38 extends parallel to the guide 31 and preferably has a rectangular or thin cross section and preferably projects centrally from the backrest carrier 4a towards the head support 8, and It is held at this position by the mounting tool 41. In this configuration, the end of the connecting rod 38 that faces the joint 6 is the backrest transport unit 4.
It is connected to a so as to be movable in the axial direction. For example, 4
At 2, it is clamped or screwed. The vicinity of the end of the connecting rod 38 away from the joint passes through a correspondingly shaped guide hole 43 in the housing 44 of the backrest. The backrest housing 44 forms a body support portion 4b together with a cushion 45 mounted on the front side with respect to the back. The backrest housing 44 has a substantially flat carrier plate 44a and a pan-shaped housing 44b. A back cushion 45 is attached to the transport plate 44a. The edge of the housing 44b is placed facing the carrier plate 44a, and is mounted invisible on it. The guide hole 43 is arranged in a metal plate 46 extending laterally on the backrest 4. The metal plate projects from the rear inner wall 44c of the backrest housing 44 toward the transport plate 44a, and is preferably integrally formed with the rear inner wall 44c. To accommodate this adjustment, the connecting rod 38 has three latching holes 47 offset by one in the direction of adjustment. The pin-shaped latch mechanism 48 can be latched toward the latching hole. This latch mechanism is arranged on the latch connection 49. The latch connection 49
Is adjustable, preferably manually adjustable body support 4b
It is provided in. In this case, between the latched position (shown in FIG. 3) and the released position, the backrest housing 44
It is provided in.

In this configuration, the latch connection portion 49 can be manually moved from the rear side of the backrest 4. It is formed by a rotating part having a grip part 51. The grip portion 51 is arranged on the back side of the body support portion 4b, in this case, in the housing 44 of the backrest, particularly in the center portion. In order that the latch connection 49 does not unnecessarily project from the body support 4b, preferably at least partly, the body support 4b.
It is located submerged in the opening 52 in b, in this case the housing 44 of the backrest, preferably in the rear wall 44c. The latch connection 49 is preferably a flap-like component, approximately the size of a hand, and has a grip recess 53 that is pulled inward. A grip bar 54 is formed by the grip recess 53. The grip bar 54 is located at the end opposite the connection joint 55. The latch connection 49 is preferably arranged to substantially close the opening 52 in the rear wall 44c. Thereby, the grip bar 54 has a straight ring 56 like a recessed flange. In the latched position, the ring 56 withstands the outward force of the body support 4b. The outward pivotal movement of the latch connection 49 is limited by a bung, which is preferably inwardly located on the opposite side of the annulus 56, in this case preferably oblique. Is formed by the connection wall 54a. The pin-shaped latch mechanism 48 is integrally formed on the bottom surface 49a of the grip recess 53 near an end portion thereof away from the connection joint 55. The latch connection part 49 is pushed toward the latch position by a spring. In this configuration, a compression spring 58 is provided, which extends from the floor of the grip recess 53 or laterally from the latch member 48 away from the connection 55 and the associated housing wall, in this case. Is attached to the rear wall 44c. In this configuration, the latch connecting portion 49 is provided so as to be rotated by the connecting joint 55 having a horizontal rotating shaft. The connection joint 55 is provided at the lower edge portion of the latch connection 49.

In this configuration, the housing 44b, the latch connection 49, the back carrier 4a, and possibly the connecting rod 38 and the push-pull connection 32 are also:
Like the joint 6, it is made of plastic. Preferably, the body support 4b is biased by the force of a spring towards its push-in or push-out end position, which facilitates handling during adjustment. In the exemplary embodiment disclosed, according to FIG. 2, a tension spring is provided in the housing 44 of the backrest for the purpose of facilitating ergonomic handling (one-handed operation).
It is provided. And / or spring 6 for applying pressure
1 is provided for the purpose of weight correction. The spring is provided between the body support portion 4b and the backrest transport portion 4a. Then, consistent with FIG. 2, pressure is applied to the body support towards lower or higher positions. As further shown in FIG. 2, a recess 62 is provided near the upper end of the backrest carrier 4a for the purpose of making the structure more compact. In the vicinity of this recess, the latch connecting portion 49 may be located at least at the push-in position of the body supporting portion 4b.

The concave portion 63 penetrating in the lateral direction is formed by the body supporting portion 4.
It is formed at the center of the upper end of b. The head support 8 is pushed into this recess by the transport rod 11 in order to fit a body of small size. The transport rod 11 or the transport rail can be moved longitudinally in a guide in the housing 44 of the backrest and fixed in the desired position by a braking force which can be overcome or by a removable fixing device. can do. In this configuration, the recess 63 extends laterally through the back cushion 45 and the backrest housing 44, so that the upper housing wall 44d also forms a corresponding recess.

Finally, the following advantages, which are also achieved by the present invention, are highlighted. Although the maximum displacement of the head support portion 8 is made possible, the back portion is reliably supported. The arrangement according to the invention provides good head, shoulder and near-back support, especially for large persons and for small persons or children.

During the pivoting of the backrest 4, no or only a slight amount of the patient's sliding on the cushion results in a head indicator for the change between subsequent maxillary and mandibular treatments. No adjustment is required. Backrest 4
Has the following rotation range.

Seating of the patient: backrest about 70 ° to the horizontal Mandibular treatment: backrest about 45 ° to the horizontal treatment of the upper jaw: backrest about 5 ° to the horizontal The structure according to the present invention is an emergency first aid. It also allows a horizontal position (folded state) of the backrest 4 relative to the procedure.

The correcting movement is controlled substantially linearly in the positive direction with respect to the rotating mechanism of the backrest 4. The forward control is performed by an eccentric portion for converting the rotating or rotating movement of the backrest 4 into a longitudinal movement, that is, the push rod 33.
And a deflection or displacement transmission lever 45.

According to the arrangement according to the invention, only one common guide 31 is provided, which is used both for corrective movement and for adjusting the backrest length. Within the scope of the present invention, arranging the latch connection 49 inside an elastic flexible wall, such as the rear wall 44c, without locating the latch connection 49 operatively using the opening 52,
Elastic deformation of the wall or wall region may also be used to allow movement between the latched position and the position where the latch is released. The bending in and the bending out of the flexible wall can be achieved by pulling or pressing on the grip of the wall.

The present invention is not limited to the above-mentioned embodiments, but can be variously modified within the scope of the present invention.

[0031]

As described above, according to the present invention, while the backrest is being rotated, the body supporting portion conforms to the backrest carrying portion or approaches the back of the patient. So that it is automatically moved in or out. As a result, the patient's back does not have to move for the effect transmitted to the body support, which improves the comfort of the treatment chair. In this way, the patient's back does not have to perform any adjustment work. The body pointing unit is automatically moved to each corrected position or especially the initial position. As a result, before or even in the intervening backrest,
It allows the patient's back to be raised from the back and then laid down again without returning or repositioning the body support. Thereby, it becomes possible to adapt the length of the seating and body holding portion to different physiques while ensuring this correction.

The present invention also allows quick manual adjustment and adjustment of the backrest for patients of different sizes. Also, the cost for the treatment chair of the present invention is significantly reduced, both in terms of manufacturing and control. This will reduce the manufacturing cost considerably. Moreover, this treatment chair is less susceptible to failure and saves energy.

[Brief description of drawings]

FIG. 1 is a perspective view of a treatment chair, in particular a dental treatment chair according to the present invention.

FIG. 2 is a partially sectioned front view of the back of the treatment chair.

FIG. 3 is a sectional view taken along line III-III in FIG.

[Explanation of symbols]

 1 ... Dental treatment chair 2 ... Seat 3 ... Leg support 4 ... Backrest 8 ... Head support 12 ... Armrest 13 ... Backrest compensator 14 ... Backrest length adjuster

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Wilfried Habeck, Republic of Germany, Bibrache D-88400, Thuringienstraße 43 (72) Inventor Karl-Heinz Wrap Germany, Mittervibrache D-88441, Linden Strasse 33 (72) Inventor Andreas Spech, Schumaelhofen / Asmannschardt D-88433, Saint Michael Strasse 6 Germany

Claims (17)

[Claims] 1. A seat (2) which is adjustable as much as possible, an adjustable backrest (4) and a preferably adjustable head indicator (8), the backrest (4) being a treatment. A first adjusting device (7) extending horizontally and laterally to the chair (1) allows it to pivot about the joint shaft (6a) and fix it in each pivot position, so that the backrest (4) A chair for medical or dental treatment, which is longitudinally displaceable by a backrest compensator (13) for preventing a change in the relative position between the backrest (4) and the patient's back when pivoting. 1) The correction device is a correction device (13) that automatically adjusts the backrest (4) according to its movement, and is further integrated into the correction device. It is arranged continuously at the end, while holding the correction,
Characterized by having a backrest length adjusting device (14) for adjusting the length for adjusting according to the difference in the physical constitution of the patient and for fixing the backrest (4) in the adjusted position. Medical or dental chair. 2. A medical or dental chair according to claim 1, wherein the correction device (13) is controlled depending on the respective angular position of the backrest (4) and / or the backrest (4). ) A chair for medical or dental treatment characterized by being driven by an adjusting force during rotation. 3. A medical or dental chair (1) according to claim 1 or 2, wherein the backrest (4) is provided with a backrest carrying part (4a) and a joint shaft (6a). ) With a body support part (4b) provided so as to be movable in a substantially radial direction along the guide (31), the backrest carrying part (4a) is rotatably connected to the joint shaft. Characterized in that it is connected to the seat (2) by means of a joint (6) with (6a), and that the backrest carrier engages the compensator (13) at the body support (4b). A medical or dental chair. 4. A medical or dental chair according to any one of claims 1 to 3, wherein the correction device (13) is attached to the joint shaft (6a) near the joint (6). A medical department characterized by eccentrically having a push-pull coupling part (32) rotatably coupled to a seat part (2) or a joint part (2a) thereof by a rotation surface of a backrest (4) or Dental chair. 5. The chair for medical or dental treatment according to claim 4, wherein the push-pull coupling part (32) is in the body support part (4b).
In particular, it extends through a substantially radial through hole (34) in the backrest housing (44) and, more preferably, the arm (4d) of the backrest carrier (4a) mounted on the joint (6). ), Extending in the longitudinal direction through a medical or dental chair. 6. Medical or dental chair according to claim 4 or 5, characterized in that the push-pull connection has two arms, in particular a double arm lever (35). Treatment chair. 7. Medical or dental chair according to claim 4 or 6, characterized in that the push-pull connection (32) is adjustable and can be fixed in its length. Medical or dental chair. 8. The chair for medical or dental treatment according to any one of claims 1 to 7, wherein the backrest length adjusting device (14) is a correcting device (13).
And a body support portion (4b) are provided between the medical department and the dental treatment chair. 9. A chair for medical or dental treatment according to claim 1, wherein the backrest length adjusting device (14) has an effective length continuously or in stages. A medical or dental chair characterized in that it is formed by a mechanically adjusted mechanical coupling mechanism and is fixed at each adjusted position. 10. An adjustable seat (2), an adjustable backrest (4), and preferably an adjustable head indicator (8) as far as possible, the backrest (4) being a treatment. A first adjusting device (7) extending horizontally and laterally on the chair (1) is rotatable about the joint shaft (6a) and can be fixed at each rotating position, and its backrest is a backrest. It has a carrier part (4a) and a body support part (4b), the backrest carrier part is rotatably coupled to the seat part (2) by a joint shaft (6a), and the body support part (4b) is , Which is provided on the backrest transport section (4a) by the guide (31), is movable in the radial direction with respect to the joint shaft (6a), and is adjusted and fixed by the backrest length adjusting device (14). A medical or dental chair that is capable of It has a manually actuatable backrest length adjusting device (14) formed by a mechanical coupling mechanism between the lean carrier (4a) or the seat (2) and the body support (4b), The coupling mechanism can be adjusted by fixing its length by a clamping or latching device having a movable clamping or latch coupling (49), and the body support (4b) can be fixed on the backrest housing (4b). 44)
And a cushion (4
5) and an adjusting device (14) is provided in the housing of its backrest, and a clamping or latching connection (49) is provided with an opening (5
2) or by a passage in the backrest housing (44), or by push-pull utilizing the resilient wall (44c) of the backrest housing (44), from outside the housing. Featured medical or dental chair. 11. Medical or dental chair according to claim 10, wherein the coupling mechanism comprises a coupling rod (38) extending in the longitudinal direction of the guide (31), the rod comprising: The clamping part or the fixing part (49) connected to the body supporting part (4b) has a connecting rod (38) at a selected push-in or push-out position of the body supporting part (4b).
A medical or dental chair characterized by being able to be combined with. 12. A medical or dental chair according to claim 10 or 11, wherein the latching connection comprises the connecting rod (38) and a fixing part (4).
9), one of these two components being movable between a latching position and a release position,
Medical or dental chair, preferably characterized in that the force is applied in the direction of the latching position. 13. Medical or dental chair according to claim 10 or 12, wherein the backrest length adjusting device (14) is provided in a housing of the backrest (44), Medical or dental chair characterized in that it can be driven manually through the opening or through a grip (54) that penetrates the wall of its housing. 14. Medical or dental chair according to any of the preceding claims, wherein the clamping or latching connection (49) is at least partially in the opening of the housing (44) of the backrest. (5
2) A chair for medical or dental treatment, which is provided so as to be submerged therein, and is preferably provided so as to be rotatable. 15. Medical or dental chair according to any of the preceding claims, wherein the clamping or latching connection (49) is the wall (44c) behind the housing (44) of the backrest. Of the medical or dental treatment chair, which is preferably provided vertically near the central plane, and more preferably horizontally near the central plane. 16. A medical or dental chair according to any of the preceding claims, wherein the clamping or latching connection (49) is preferably provided by means of a joint at its lower end. Is a chair for medical or dental treatment, which is provided so as to be rotatable around a horizontal lateral axis. 17. Medical or dental chair according to claim 1, wherein the clamping or latching connection (49) is especially below the clamping or latching connection (49). A chair for medical or dental treatment, which has a grip portion in the shape of a grip bar that is formed by the protrusion to the inside of the side.