EP1138306A1 - Medical or dental chair and head rest for such a chair - Google Patents

Abstract

The treatment couch has a back-rest (4) and head-rest which is swivel-connected to the back-rest by a swivel arrangement (17) possessing a first linkage (24), and which is fixed in its swivel position by means of a fixture (19a). The fixture consists of a piston cylinder (34a) with two operating chambers and connected to the link-parts of the first linkage. The operating chambers are connected by a connecting pipe containing a valve opened and closed by a control.

Description

The invention relates to a medical or dental medicine Treatment chair or on a headrest for such a treatment chair the preamble of claim 1 or 2.

A treatment chair or a headrest of these types are described in DE 296 20 801 U1 described. In this known treatment chair or in this known Headrest is a swivel device in the form of a for adjusting the headrest Articulated quadrilateral provided, with an associated locking device for locking the swivel device is also present in the respective swivel position. The Locking device has a coupling in the area of the base joint of the Quadrilaterals on, with one between a coupling position and one Decoupling position movable coupling element for optional locking or Locking and releasing the joint. There is a manually movable one on the headrest Actuator for opening and / or closing the clutch provided by a cable is connected to the coupling. Furthermore, the clutch is one Locking device associated with a locking part that when opening the clutch locks unactuated actuator and releases when the actuator is actuated.

A treatment chair or a headrest is also known from EP 0 701 806 A1 at the beginning of the specified type. In this known embodiment, the Swivel device on a handlebar with two joints in its end areas, the through its base joint with a headrest holder of an associated backrest and carries the headrest in his second joint. The joints are one Locking device with a pneumatic piston cylinder with a working chamber assigned to clamp the joints. The piston cylinder is through the Pneumatic pressure of a hand pump can be activated and activated. For one Clamping the joints requires a considerable clamping tension, because in Functional operation of the headrest is subject to significant loads, mainly can be exercised by the patient and try to displace them. There are therefore considerable locking forces are required to hold the headrest in place secure the set position. Another disadvantage of this known design is that it requires extensive handling to the headrest in the desired position. Both are essential Operating hands required, with one operating hand closing the headrest is to be adjusted and positioned and with the other operating hand pneumatic pressure element is to be actuated.

A treatment chair or a headrest of the types specified at the outset is also in EP 0 673 633 A2. In this known embodiment, the Swivel device of the headrest formed by a so-called quadrilateral joint, the base joint connecting the swivel device to the backrest a coupling for locking the joint is assigned by the manual Open actuation of an actuating member mounted movably on the headrest is. The actuator in this known embodiment is a tiltable Part that can be tilted with the operating hand. The actuator is through a Cable connected to the clutch, so that the tilting movement to open the Coupling can be used.

The invention is based, with a treatment chair or a task Headrest of the types specified in the introduction to improve the support function. It should Manufacturing effort and / or the handling effort for adjusting and adjusting the headrest should be low. In addition, the headrest should be in its set position be stable so that the risk of unintentional adjustment is avoided or is reduced.

This object is solved by the features of claims 1 and 2, respectively. Beneficial Further developments of the invention are described in the associated subclaims.

In the embodiment according to the invention, a locking device comes with a Piston cylinder used, the corresponding joint in the set position blocked. Even when the headrest is subjected to greater loads, its positioning is important secured in the set position. A piston cylinder is particularly suitable, whose working chambers are filled with a liquid, especially oil, which due to low compressibility, the blocking of the piston cylinder and thus the Joint causes. To remove this lock, little effort is required especially a small manual operation, namely the opening of a valve in a connecting line connecting the working chambers. This Measure can be done with little effort, especially effort, and with perform a small movement so that the valve opens and closes is easy to handle. Piston cylinders of this type are in themselves known components that are available on the technical market and previously for other uses.

A further development of the invention makes it possible to adjust and adjust the Headrest also with little handling, and it also it is possible to adjust the headrest with one-hand operation and in the desired one Position. Here, the headrest can be preferably by a side Overlap of the handle part carrying the actuator and the actuator easy to handle and be guided in their adjustment movement. there is the actuator either by the thumb of the operating hand or with at least one opposite finger can be moved into its release position, especially insertable. In this grip position, the headrest is in the Operating hand at the same time a firm grip, which enables the headrest both around the first joint as well as around the second joint into the desired supporting position move. In this position, only one pressure relief or one is required Letting go of the actuator, the actuator due to its elastic restoring force is automatically moved into its locked position in which Joint is blocked. Another advantage of this design is that it is suitable for both right-handed and left-handed users.

It is possible to design the inventive design for the first joint and / or for to provide the second joint. If both joints have one according to the invention Piston cylinder is assigned, it is particularly advantageous to use one for both piston cylinders provide common actuator so that both joints by the actuation unlocked the actuator or locked when you release the actuator or blocked. In this embodiment, the headrest is special easy to use, because both can move simultaneously Joints optional support positions can be set with a manual movement can. In this context, it is also advantageous to use the actuator with one extending parallel to the plane of movement of the joints Form actuating surface that is so large that it is in any pivot position associated valve members can operate.

Furthermore, the configurations according to the invention are characterized by a simple, small and inexpensive to manufacture, which can be easily in the Allows adjustment device to be integrated and enables a safe function.

Fig. 1

einen erfindungsgemäßen Behandlungsstuhl in der Seitenansicht;

Fig. 2

eine Kopfstütze des Behandlungsstuhls in vergrößerter Darstellung in der Seitenansicht;

Fig. 3

die Kopfstütze in der Rückansicht;

Fig. 4

die Kopfstütze in der Draufsicht;

Fig. 5

die Kopfstütze in einer etwas vergrößerten Darstellung und in ihrer ausgeschwenkten Stützstellung;

Fig. 6

die Kopfstütze in perspektivischer Darstellung von hinten und schräg von oben;

Fig. 7

einen Kolbenzylinder für die Kopfstütze im axialen Schnitt, der sich in einer hydraulisch verriegelter Position seiner Kolbenstange befindet.

The invention and further advantages which can be achieved by means of preferred embodiments are explained in more detail below. It shows

Fig. 1

a treatment chair according to the invention in side view;

Fig. 2

a headrest of the treatment chair in an enlarged view in side view;

Fig. 3

the headrest in the rear view;

Fig. 4

the headrest in top view;

Fig. 5

the headrest in a somewhat enlarged representation and in its swung-out support position;

Fig. 6

the headrest in perspective from behind and diagonally from above;

Fig. 7

a piston cylinder for the headrest in axial section, which is in a hydraulically locked position of its piston rod.

The main parts of the medical or designated in its entirety with 1 dental treatment chair are in its vertical longitudinal median plane E. preferably position-adjustable seat part 2 with a legrest 3, a backrest 4, the at the rear end of the seat part 2 by a backrest joint 5 with a horizontal, extending transversely to the treatment chair 1 joint axis with the Seat part 2 is connected and by a first, not shown in detail Adjustment device around the hinge axis between an upright sitting position and an approximately horizontal lying position adjustable and in the respective adjustment position can be determined by a first locking device, a headrest 7 with a Base body 8, which by means of one or two in the longitudinal direction of the backrest 4th extending support rods 9 is adjustably mounted on the backrest 4. With 12 is one adjustable first support for treatment instruments 13, which mainly used by the dentist, and at 14 is an adjustable second carrier for Designated treatment instruments 15, mainly used by an assistant become.

The extending in the longitudinal direction of the backrest 3 support rods 9, the adjustably connected to the backrest 3 and by one indicated in Fig. 2 Detachable locking device 11 that can be overridden with a certain amount of force can be ascertained, form a headrest holder 16. The headrest 7 is on this by a pivoting device 17 in the vertical longitudinal center plane E of the Treatment chair 1 adjustable and in the respective swivel position by a held in its entirety by 19 designated second locking device, around the headrest 7 with a cushion arranged on its front or top 21 in a desired support position with respect to a patient's head adjust. A second adjusting device formed in this way is 22 in its entirety designated.

The pivoting device 17 has a link 23 which passes through at one end a first joint 24 with the headrest holder 16 in the longitudinal center plane E. is pivotally connected, and at its other end by a second joint 25 is connected to a joint part of the base body 8. The handlebar 23 is a so-called wide link, d. that is, it consists of two horizontal distances Handlebar webs 23a, which are preferably separated from one another by a preferably at the top or traverse 23b arranged at the lower edge to form a rigid handlebar component are stabilized, the ends of the link bars 23a projecting freely from the Extend truss 23b. The first joint 24 is in a base part 27, here in shape of an approximately cylindrical body, in which there is a joint recess 28 for the handlebar 23, the hinge axis 24a with an associated Eccentric pivot pin, here offset upwards, is arranged in the base part 27. in the Region of the end sections of the base part 27 formed by the joint recess 28 are z. B. secantial holes 29 arranged in the transverse distance of the support rod 9, in which are used and fixed by securing elements.

The headrest-side joint part of the second joint 25 is similar to a the handlebar 23 from two lateral base body webs 31a of an elongated base support 31 is formed, on which a base body shell 32 is fastened, which in the region of the second Joint 25 preferably a hollow box body 32a on the underside has integrally formed and carries the pad 21 on the top, which preferably is detachably clipped thereon. This can be done by one or more Push button connections are used, which are not shown for reasons of simplification.

The link webs 23a and the base body webs 31a point towards the formation of the second Joint 25 upward or downward angled web extensions 23c, 31c, which overlap one another and in whose area the second joint 25 is formed is, e.g. B. in that a hinge pin 25a the web extensions in one Articulated hole penetrated and fixed in it. To accommodate the second joint 25 the base body shell 32 has a recess 33 in the associated area, which extends to the front between lateral body webs 8b. This achieves a space-saving or low design, as is the case 2 shows in particular, in which the link 23 in the pivoted-in position between the body webs 8b are arranged at their height and the base body support 31 is itself is located relatively close above the handlebar 23.

The locking devices 19a, 19b assigned to the first and second joint 24, 25 are basically identical to each other, and they each have a piston cylinder 34a, 34b, the working chambers arranged on both sides of the piston 35 36, 37 are connected to one another by a connecting line 38 in which a selectively openable and closable valve 39 is arranged by a longitudinally movably guided valve lifter 41 can be opened and z. B. automatically due a spring force closes. 7 are the Connection line 38 and the valve 39 arranged in the piston 35, the Connecting line 38 opens out on both sides of the piston 35 and the Valve body of the valve 39 through the piston rod 42 in a longitudinal bore slidably mounted valve lifter 41 is displaceable in its open position. This takes place by inserting the valve tappet 41 against the elastic restoring force a return spring 41a which the valve lifter 41 in its shown in Fig. 7 Resets the open position in which its contact end 41b facing away from the valve 39 Piston rod 42 protrudes. The free end region of the piston rod 42 has Connecting element 42a in the form of an external thread. The opposite End of the cylinder 43 has a connecting element 42b, which e.g. in form of screwed joint eye with a transversely extending joint hole (Fig. 2) can be formed and is thus connected to a joint, which is still described becomes. In Fig. 7 the hinge eye is not shown for reasons of simplification. The Piston 35 has coaxially arranged on both sides and e.g. screwed into it Piston rod sections 42c, 42d, of which one piston rod section 42c has an axial through hole 42e in which the valve lifter 41 is axially displaceable is stored. A valve pin 41d bearing against the inner end of the valve lifter 41 a thickened valve body 41e is directed toward by the return spring 41a a valve seat 39a and biased on the valve lifter 41. The return spring 41a may be located in a blind hole 42f of the piston rod portion 42d. The Connection line 38 extends through the wall of one piston rod section 42c, through the valve seat, partly through the blind hole 43f and through the two-part wall of the other piston rod section 42b and thus connects at open valve 39, the two working chambers 36, 37 with each other Cross-sectional size is the same, since the piston rod sections 42c, 42d of are of the same cross-sectional size. The piston chamber 37 is through a in the hollow cylinder of the piston cylinder 34a, 34b delimited partition that the Piston rod section 42d penetrated sealed in a hole, being in a free chamber 34c arranged behind it can be immersed. When the valve lifter 41 around a few millimeters to the right in the position 41c shown in dashed lines (in FIG. 7) is moved, the valve 39 is open and the piston 35 can with the Piston rod sections 42c, 42d and with the valve lifter 41 optionally in both Directions are freely shifted, the liquid medium, e.g. Oil through which Valve opening overflows. When the valve lifter 41 is released, this closes Valve 39 automatically by the spring force. This allows the piston rod 42 in Block any stroke position against displacement, which the Detection or blocking of the first or second joint 24, 25 is effected.

The piston cylinders 34a, 34b are each pivotable with the two joint parts of the associated joint 24, 25 connected, the connecting points each one Distance or offset V1, V2 (Fig. 2) from the joint axis of the associated joint 24, 25 have. Due to this arrangement, the pivotal movement of the Handlebar 23 and / or the base body 8 of the associated piston cylinder depending on the slide the existing swivel direction in or out. However, this is only possible when the valve 39 is open. When the valve 39 is closed, the respective joint is 24, 25 blocked by the associated cylinder piston 34a, 34b. To unlock the The associated valve tappet 41 is articulated and opened by the valve 39 manual actuation of an actuator 45 moves, inserted here that the Valve 39 is opened. The actuator 45 is under an indirect or effective elastic restoring force directly on it, the z. B. by one on the Actuator 45 effective return spring is generated. Once the manual printing is withdrawn on the actuator 45 or the body attachment 8a is released, the actuator 45 moves automatically into his Starting position in which the automatically closing valve 39 is closed.

An actuator 45 can be assigned to each piston cylinder 34a, 34b. To simplify handling and also to enable one One-handed operation is advantageous if both piston cylinders 34a, 35a have a common one Assign actuator 45, when actuated, both valves 39 opened and both joints 24, 25 are unlocked. By letting go of the common Actuator 45, both joints 24, 25 are blocked automatically.

In the present embodiment, the piston cylinder 34a is a third Joint 46 connected to the base part 27, the third joint 46 with respect to the first joint 24 is offset transversely to the handlebar 23, so that the first, the second and the third joint 24, 25, 46 form the corners of an imaginary triangle. At the present embodiment, which can best be seen in FIG. 2, is the third Joint 46 is offset by the offset dimension V1 with respect to the first joint 24. The other or rear end of the piston cylinder 34a is through a fourth joint 47 connected to the handlebar 23, which is preferably integrated in the second joint 25. For this purpose, one is used with the associated end of the piston cylinder 34a, here with its Piston rod 42, connected, preferably screwed-on truss head 48, the by means of a transverse or two lateral hinge pin 49 the Push through the bar webs 23a and the base body web 31a to the outside, thereby simultaneously the second joint 25 and the fourth joint 47 are formed. Preferably is Formation of the second joint 25 of the links 23 and / or the base body supports 31 thighs directed towards one another angularly shaped. This will in pivoted state achieved a compact design, as it is in particular Fig. 2 can be seen. In the present embodiment, the Base body webs 31a with those extending transversely or obliquely downwards Web extensions 31c are angularly shaped.

In principle, the upper piston cylinder 34b is comparable with its rear end with respect to the second joint 25 by the offset dimension V2 Handlebar 23 connected. For this purpose, the link 23 is most clearly shown in FIG. 5 recognizable and angled upwardly projecting web extensions 23c Have hinge holes 51 in which a corresponding to the crosshead 48a Traverse head 48b by means of a continuous or two lateral bolts 52 is mounted, the crosshead 48b with the piston rod 42 of the piston cylinder 34b connected, in particular screwed. This is a fifth joint 53 for formed the piston cylinder 34b, which is offset transversely with respect to the second joint 25 is shifted up here by the dimension V2. The front end of the piston cylinder 34b is designed to be self-supporting in the present exemplary embodiment Base body shell 32 in a sixth joint 54 formed thereon in the Swivel plane pivotally mounted. The second, fifth and sixth joint 25, 53, 54 are also in the corners of an imaginary triangle.

Both piston cylinders 34a, 34b point backwards with their piston rods 42 arranged so that the valve lifters 41 are arranged close to each other and can preferably be done together by the actuator 45. Since the Direction of movement of the actuator 45 perpendicular to the pivot direction is directed, and the direction of movement of the valve lifter 41 lies in the pivot plane, there is a need for a conversion gear 55 between the actuator 45 and the or the valve tappets 41. Since the protruding from the piston rods 42 Contact ends 41b of the valve lifter 41 during pivoting To perform circular arc-shaped movements, a configuration of the Actuator 45 such that it is in every pivot position with the associated is preferably connected to both conversion gears 55. This is served by a on the actuator 45 arranged actuator plate 45a, the actuating surface extends parallel to the pivot plane or longitudinal center plane E. The actuator plate 45a is dimensioned so large that it is in any pivot position with the or Conversion gear 55 is in drive connection. In the present An exemplary embodiment is a conversion gear 55 for each piston cylinder 34a, 34b available, which can be moved in a guide by a transversely to the swivel plane Actuating bolt 56 formed, the end facing the actuator 45 on the actuating plate 45a rests and which has a curved or inclined surface 57, which is in contact with the contact end 41b so that when the Actuator 45 inward valve 39 is opened. The provision of the Actuating bolt 56 can be made by a spring, which by the actuating bolt 56 can also serve for the return movement of the actuator 45. As from Fig. 6 too can be seen, the actuating pin 56 is in on both sides of the associated Contacting 41b on the crosshead 48 arranged bearing walls 58 therein trained guide holes stored. To prevent rotation of the Actuating bolt 56 is one between it and one of the bearing walls 58 Protection against rotation is provided by the associated bearing wall 58 and one Slot in the actuating pin 56 is formed through the pin. The other Conversion gear 55 is designed accordingly.

The actuator 45 is in a guide 61 on the base body support 31 and / or the basic body shell 32 or attached parts of the same. In the present Exemplary embodiment is the guide 61 through two guide holes 62a, 62b in one Extension extension 23d of the handlebar 23 or the handlebar webs, which is extended to the rear 23a formed, the actuator 45 two inwardly projecting Guide rods 63a, 63b which engage in the guide holes 62a, 62b. For Guiding or further guiding can also have an opening edge 64 of an opening into which the actuator 45 can be inserted, see Fig. 6. Can serve as a return spring a tension spring 65 may be provided, which between an actuator 45 facing away bearing wall 58 and the associated actuating pin 56 and can be attached with their ends to these two parts.

If the extension lugs 31 are in the area of an adjacent one Actuating bolt 56 are located, a z. B. curved slot 60 in the Extension lugs 31d through which the associated end of the actuating bolt 56 can extend (Fig. 6).

On the one hand, it is horizontal over the body attachment 8a and the actuating member 45 Measured dimension a (Fig. 4) and on the other hand the average distance b of the Actuator 45 dimensioned from the back of the body attachment 8a only so large that the body approach 8a and the actuator 45 from below or from behind with the Operating hand can be gripped and the one indicated by arrow 66 Push-in movement of the actuator manually and easy to use can be carried out. One or more fingers practice the operating hand the opposite side of the body attachment 8a by the arrow 67 illustrated abutment force. The joints 24, 25 are in this actuation position unlocked, and the headrest 7 can with one and the same hand One-hand operation swiveled into the desired swivel position or support position become. Once the actuator 45 is released, it will return due to the elastic spring force automatically returns to its original position, the joints 24, 25 block automatically.

In particular, the handlebar 23 can be covered by trim parts 68 shown in FIG. 2 be disguised to avoid finger injuries and / or the appearance of the Improve headrest 7.

With 69 a leg integrally formed on the actuator is referred to the joint shell 32 engages on the outside and the associated edge of the Guide opening for the actuator 45 covered.

In order to facilitate handling even in difficult settings of the headrest 7, can z. B. strip-shaped handle parts 71 be arranged, which is attached to the base body 8 or the base body shell 32, can preferably be molded.

Finally, the following advantages are described.
An infinitely variable setting is achieved, with no mechanical locking.
Safe operation is possible.
A horizontal transition from the head cushion 21 to the backrest cushion (child treatment) can be set.
The head cushion 21 can be pushed directly onto the backrest cushion. Operation and setting can also be carried out under higher loads.
Simple assembly or disassembly is possible.

Claims (15)

Medical or dental medical treatment chair (1) with a backrest (4) and a headrest (7), the headrest (7) being pivotably connected to the backrest (4) by a swivel device (17) having a first joint (24) and by a locking device (19a) can be locked in the respective swivel position,
characterized in that the locking device (19a) has a piston cylinder (34a) with two working chambers (36, 37) which is connected to the joint parts of the first joint (24), that the working chambers (36, 37) by a connecting line (38 ) are connected to one another, in which a valve (39) is arranged, which can be opened and closed optionally, and that an actuating member (45) is provided for optionally opening and closing the valve (39). Headrest (7) for a medical or dental treatment chair (1) with a backrest (4), the headrest (7) being pivotally connected to the backrest (4) by a swivel device (17) having a first joint (24) and by a locking device (19a) can be locked in the respective swivel position,
characterized in that the locking device (19a) has a piston cylinder (34a) with two working chambers (36, 37) which is connected to the joint parts of the first joint (24), that the working chambers (36, 37) by a connecting line (38 ) are connected to one another, in which a valve (39) is arranged, which can be opened and closed optionally, and that an actuating member (45) is provided for optionally opening and closing the valve (39). Treatment chair or headrest according to claim 1 or 2,
characterized in that the actuating member (45) is arranged on one side of a handle part (8a) arranged on the headrest (7) and can be overlapped together with the handle part (8a) by the thumb and at least one finger of an operating hand and by manual pressure exerted against a restoring force is movable. Treatment chair or headrest according to one of the preceding claims,
characterized in that the pivoting device (17) has a second joint (25) which can be locked by a second locking device (19b) which can be released by an actuator (45), the second locking device (19b) preferably a piston cylinder (34b ) with two working chambers (36, 37) which is connected to the joint parts of the second joint (25), and wherein the working chambers (36, 37) are connected to one another by a connecting line (38) in which a valve (39) is arranged, which can be optionally opened and closed by the actuator (45). Treatment chair or headrest according to one of the preceding claims,
characterized in that the actuating member (45) is arranged on one longitudinal side with respect to the headrest (7). Treatment chair or headrest according to claim 5,
characterized in that a common actuator (45) is provided for both locking devices (19a, 19b). Treatment chair or headrest according to one of the preceding claims,
characterized in that the connecting line (38) extends through the piston (35) of the piston cylinder (34a, 35b). Treatment chair or headrest according to claim 7,
characterized in that the valve (39) is arranged in the piston (35) or in the piston rod (42) of the piston cylinder (34a, 34b). Treatment chair or headrest according to claim 8,
characterized in that a valve tappet (41) is guided in the piston rod (42) so as to be longitudinally displaceable. Treatment chair or headrest according to one of the preceding claims,
characterized in that the actuating member (45) is movable transversely to the longitudinal axis of the piston cylinder (34a, 34b) and a conversion gear (55) is provided between the actuating member (45) and the valve (39) which controls the movement of the actuating member (45) into a movement in the longitudinal direction of the piston cylinder (24a, 24b) of a valve tappet (41) for the valve (39). Treatment chair or headrest according to one of the preceding claims,
characterized in that the actuating member (45) has an actuating surface which preferably extends parallel to the pivoting plane and which is so large that in each pivoting position the valve or valves (39) or valve tappet (41) or conversion gearbox (s) 55) can operate. Treatment chair or headrest according to one of the preceding claims,
characterized in that the piston cylinder (34a, 35b) is pivotally connected to the joint parts of the associated joint (24, 25). Treatment chair or headrest according to one of the preceding claims,
characterized in that the first joint (24) and the second joint (25) are arranged at the ends of a link (23). Treatment chair or headrest according to claim 13,
characterized in that the second joint (25) is arranged on an angled leg (31c) of an associated joint part. Treatment chair or headrest according to one of the preceding claims,
characterized in that the handle part (8a) is arranged on the underside of the headrest (7).

Images