EP0250646A2 - Device for lifting and lowering the head and the foot rest of a mattress support - Google Patents

Abstract

In the device (2), the swivel movement of the headrest (11) and the footrest (22) takes place by means of a motor via pairs (9 and 25) of swivel levers which may be connected to one another via drawbars (14). A device and a corresponding design of the fittings are to be provided which can optionally be used for accommodating a single motor or two motors, i.e. in the former case with automatic lifting of the footrest when the headrest is lifted and, in the latter case with separate lifting of headrest and footrest by means of two motors. Two swivel axles (5, 6) are provided which can be moved about a common axis (7) of rotation, a first swivel axle (5) having the swivel levers (9) for the headrest (11), hinge straps (12) for the drawbars (14) and an attachment fitting (15) for a driving pressure motor, and a second swivel axle (6) likewise having hinge straps (19) for the drawbars (14) in addition to an attachment fitting (15') for a further pressure motor, it being possible for said drawbars (14) to be fixed optionally on corresponding hinge straps (12, 19) of the two swivel axles (5, 6), said hinge straps being arranged closely adjacently in the position of use. <IMAGE>

Description

The invention is directed to a device for lifting and lowering the head and foot part of a bed frame by means of a motor, the pivoting movement of the head part and the foot part taking place via pairs of swivel levers which are optionally connected to one another via tie rods.

In a known bed frame by the applicant with the product name "Flexaform Deluxe", the head and foot sections can be raised by a common motor. The motor presses the head part into the swivel-up position via a lever linkage and presses on swivel arms to pivot up the foot part, the foot part being held in a substantially horizontal position via a parallel linkage. In a variant with a double motor, two different motors press the respective part, e.g. B. the head part, regardless of the other part, in the respective position. In principle, this requires a new fitting that adapts to the situation of the two motors. If a bed frame equipped with only one motor is to be converted into one that is equipped with the greater ease of use of two motors, comparatively complex conversion work is necessary.

The object of the invention is to provide a solution with which a device and a corresponding fitting design can be used to accommodate a single motor or two motors, i.e. in the first case, with automatic foot section lifting when the head section is raised, in the second case with different lifting using two motors for the head section and foot section.

This object is achieved according to the invention in that two swiveling axes which can be assigned about a common axis of rotation are provided, a first swiveling axis having the swiveling levers for the head part, link brackets for the tie rods and a fastening fitting for a driving pressure motor and a second swiveling axis in addition to a fastening fitting for a further pressure motor also has link plates for the tie rods, these tie rods optionally being able to be fixed to corresponding link plates of the two pivot axes arranged close to one another in the position of use.

This design of the device ensures that the same fitting can be used either for the single motor drive or the double motor drive. If the single motor drive is selected, each of the two tie rods will be on the link bracket of the first pivot axis strengthened, which is then equipped with a motor that acts on the corresponding mounting bracket. If the motor drives this first pivot axis around the axis of rotation, the head part is pivoted open; by dragging over the drawbars, the foot section is also lifted synchronously.

If two motors are used, the two tie rods for actuating the foot section are attached to the link plates on the second swivel axis. If the first swivel axis is now moved over the first motor, only the head part rises and falls, since there is no longer a mechanical connection to the swivel fitting of the foot part via the pull rods. The up and down pivoting of the foot section then takes place via the second motor, which rotates the second pivot axis around the common axis of rotation. This causes a movement of the two tie rods and thus a movement of the foot part.

Since the articulation points of the two respective articulation brackets can be arranged comparatively close to one another on the swivel axes on each side, the respective pull rod only has to be reassigned to a certain extent in order to be converted from one variant to the other variant. The fitting can be designed the same. Of course, the design can also be made so that the second pivot axis additionally by simple means can be attached to the bed frame if a twin engine design is desired. In principle, however, it can also be present in order to give the customer the option of converting a single-motor version into a two-motor version, if necessary, by self-construction.

The invention also provides that the two pivot axes are arranged on different sides of this axis of rotation relative to the common axis of rotation.

At this point it should be noted that the term "axis of rotation" does not mean a spatial-physical wave, but only the connecting line between the pivot fittings that enable pivoting on the frame and their common imaginary axis. By moving the swivel axes, the z. B. can be designed as square tubes, each on a different side of the imaginary axis of rotation, it is possible to design the further lever so that a rotational movement of the one element in the presence of the other element is not disturbed by the latter. This is particularly important for two-motor training, since one swivel mechanism must not interfere with the swivel movement of the other mechanism when it is actuated.

The invention also provides that the axis of rotation is outside an imaginary one defined by the two pivot axes Levels is arranged. This design also serves to design the swivel range of one swivel axis about the axis of rotation so that it does not interfere in the swivel range of the other swivel axis. At the same time, this design serves to optimize the introduction of forces when the motors are actuated, since short pivot lever arms relative to the axis of rotation are already achieved by the position of the pivot axes.

As already mentioned above, the device should in particular enable the conversion or retrofitting of appropriately equipped bed frames. A further embodiment of the invention takes this wish into account in that the articulation points for each pull rod are located on both pivot axes on a common axis and in each case close to one another.

In a further embodiment it is also provided that the articulation points of the two mounting fittings for the motor drives on swivel axes lie on a common axis, whereby it is achieved to create the same conditions here too, so that only one motor type, ie one motor with an overall length, is used can. This can then be used or exchanged as required, since the respective distances and articulation situations are completely the same.

In order to be able to run both motors in the same way and thus to simplify the overall storage and fitting design, the connecting rods between the swivel fitting for the head part and the swivel fitting for the foot part have to be expediently designed as pull rods in order to enable the conversion described in more detail here. In order to be able to optimally transmit the movement carried out by a pull rod to the swing-open mechanism of the foot part, the invention provides that the respective connection point of the pull rod coincides with one end of the pivot lever of the foot part, the common axis being guided in a slide rail.

In an embodiment, the invention provides that the slide rail is designed as a cross-sectionally C-shaped profile rail, in which a correspondingly profiled, inverted C-profile engages. This design is particularly simple. Of course, other sliding elements, such as sliding rollers, sliding blocks made of high-quality plastic or the like, can also be provided here.

It has proven particularly expedient here if the connecting bolt between the swivel lever and the pull rod is guided in an elongated hole. With this design it can be achieved that in the single-motor variant, the head part swings open to a certain extent first when the motor drive is actuated, without the foot part moving, since the se pivoting movement is initially suppressed by the movement of the connecting bolt in the slot. If the connecting bolt then comes to the end of the elongated hole, the pivoting movement of the foot part also begins, since the base point of the pivoting lever is now moved via the movement of the pull rod in the slide rail and the pivoting movement is thus initiated.

• Fig. 1 eine perspektivische Darstellung der Vorrichtung mit nur angedeutetem Bettrahmen,
• Fig. 2 einen Schnitt gemäß Linie II-II in Fig. 1,
• Fig. 3 die Position des Beschlages bei aufgeschwenktem Kopfteil in der Darstellung gemäß Fig. 2,
• Fig. 4 die Position des Beschlages bei aufgeschwenktem Fußteil der Zweimotoren-Variante in der Darstellung gemäß Fig. 2 bzw. Fig. 3,
• Fig. 5 eine Seitenansicht des Bettrahmens in vereinfachter Darstellung,
• Fig. 6 einen Schnitt gemäß Linie VI-VI in Fig. 5,
• Fig. 7 eine Detailansicht des Endes einer Zugstange sowie in
• Fig. 8 eine vergrößerte Detailansicht als Aufsicht gemäß Pfeil VIII in Fig. 6.

The invention is explained below with reference to the drawing, for example. This shows in

• 1 is a perspective view of the device with only indicated bed frame,
• 2 shows a section along line II-II in FIG. 1,
• 3 shows the position of the fitting with the head part swung open in the illustration according to FIG. 2,
• 4 shows the position of the fitting when the base part of the two-motor variant is swung open in the illustration according to FIG. 2 or FIG. 3,
• 5 is a side view of the bed frame in a simplified representation,
• 6 shows a section along line VI-VI in FIG. 5,
• Fig. 7 is a detailed view of the end of a tie rod and in
• 8 is an enlarged detail view as a top view according to arrow VIII in FIG. 6.

The device, generally designated 2, is attached to a bed frame, generally designated 1, of which only part is shown in FIG. 1.

The essential parts of this device 2 are shown in perspective in FIG. 1. There it consists of cross-sectionally essentially Z-shaped side plates 3, which are connected to one another via at least one cross-piece 4 and in which two pivot rods or axes 5 and 6 can be rotated in a possibly common bearing, not shown, around an axis of rotation 7 are rotatably mounted.

On the side plates 10 are further attached under cross-section substantially C-shaped slide rails 8.

The design of the pivot axes 5 and 6 is essential for the invention: the first pivot axis 5 assigns next on the edge of the pivot lever 9 with casters 10 for pivoting the head part designated 11 in FIG. 5. On the side opposite the swivel lever 9, articulation brackets 12 are attached to the swivel axis 5 as angle brackets in such a way that the articulation points 13 provided on the free ends for tie rods 14 are lower than the line of action of the axis of rotation 7

In addition to the two link brackets 12 for the tie rods 14, a mounting bracket 15 for a pressure motor, not shown, is also provided on the pivot axis 5, the pivot points 16 of this mounting bracket 15 in their line of action in turn lying below the line of action of the articulation points 13 of the link brackets 12, as this can be seen from Fig. 2.

The pivot axis 17 indicated in FIG. 1 connects the second pivot axis 6 to the pivot axis 5 in such a way that a common axis of rotation 7 is ensured by fastening to one another or to the side plates 3. In this case, each of the pivot axis 6 is supported by an edge-side angle bracket 18, which can be welded on the end face to the square tube forming the pivot axis 6 and at the same time has such a cut that it is integrally formed on its underside on the link brackets 19 for the pull rod which can also be alternatively fastened there 14 forms.

The hinge bracket 19 also has a hinge point 13 die for the respective tie rod 14, the hinge point 13ʹ of the hinge bracket 19 lying on the same line of action as the hinge point 13 on the hinge bracket 12. The assignment is made in such a way that these two points are relatively close to one another in space, in order to enable the pull rod 14 to be easily latched when converting from a single-motor drive to a double-motor drive.

To introduce the second motor, the pivot axis 6 is equipped with a mounting bracket 15ʹ, the pivot points 16ʹ of which lie on the same imaginary line as the pivot points 16 of the bracket 15 on the pivot axis 5th

The fixed fittings for fastening the two motors, which are indicated in FIG. 1 only by dashed lines, are designated 20 for the first motor and 20ʹ for the second motor. These are firmly attached to the crossbar 4, z. B. welded.

As shown in FIG. 5, the pivotable head part 11 is followed by a central part 21 which is fixedly attached to the bed frame 1 and which is followed by a two-part foot part, generally designated 22. This foot part consists of a swivel part 23 and a parallel part 24, which is held in the position shown in FIG. 5 by means of a parallel linkage, not shown, regardless of the height of the pivoting movement by means of a respective lateral pivot lever 25 which is rotatably attached to the pivot part 23 via a pivot point 26. The free end opposite the articulation point 26 and located below the pivot axis 25 of the pivot part 23 of the foot part 22, which is located below the pivot axis, is designated as the connection point with 28 and is essentially composed of a pivot 29 (FIG. 7) and a C designed as a sliding element 30 -Profile formed with the tie rod 14, which are arranged displaceably together in the slide rail 8.

As can be seen in particular from FIG. 8, the pull rod 14 has an elongated hole designated 31.

The mode of operation of the device is first described for the pivoting movement of the foot part 22: the pivoting is effected only by moving the pull rod 14 in FIG. 5 to the right into the raised position or into the lowered position by moving the pull rod 14 5 to the left.

This movement causes the articulation point 28 to be shifted to the left or to the right within the C-rail. Thereby the pivoting part 23 of the foot part 22 is raised or lowered via the articulation point 26. The parallel part 24 is held in the horizontal position shown by the parallel linkage, not shown.

For the implementation of this movement, it does not matter which means the pull rod 14 experiences its movements. However, if the pull rod 14 is connected to the link bracket 12 - this is the case if only one motor is provided - the exertion of a compressive force on the mounting bracket 15 on the pivot axis 5 causes the pivot lever 9 for the head part 11 to pivot about the axis of rotation 7 around.

In order to allow a certain advance of this pivoting-up movement of the head part 11 relative to the foot part 22, the pivot 29 is guided in the slot 31 mentioned above.

With reference to FIGS. 2-4, the movement of the pivot axes 5 and 6 is described in particular in the case of the double motor design:

FIG. 2 shows the lowered position of both the head part and the foot part, which is also shown in FIG. 1, only the area of the pivot axes 5 and 6 being shown in FIG. 2. Fig. 3 shows the actuation of the first motor on the link plates 15, the reference line of the numbers in Fig. 3 is shown in dashed lines, since they are covered there by the link plates 15ʹ.

During the pivoting movement, the pivot axis 5 rotates downward about the axis of rotation 7. Since a pull rod is not attached to the link bracket 12, the corresponding foot part remains in the lowered position during this pivoting movement.

Fig. 4 shows the possibility of swiveling a foot part with a double motor version and a lowered head part. In this case, the second motor pivots the second pivot axis 6 around the axis of rotation 7 by applying force to the mounting bracket 15ʹ. Thus, the link bracket 19, which is fixedly connected to the pivot axis 6, is pivoted, in the position shown in FIG. 4. If a pull rod 14 is now connected to the link bracket 19, which is only indicated in FIG. 4, it is moved to the right in FIG. 4 and thus drags the foot part into a raised position.

As can be seen in particular from FIGS. 3 and 4, the two pivot axes 5 and 6 can move independently of one another, an optimal introduction of force is achieved. Not least because one through the both pivot axes 5 and 6 imaginary level when the pivoting movement is initiated lies outside the axis of rotation 7.

Of course, the described embodiment of the invention can be modified in many ways without departing from the basic idea. In particular, the invention is not limited to the cross-sectional shape of the axes shown, nor to the special type of design of the levers. Modified designs can be provided here and the like. More.

Claims (8)

1. Device for lifting and lowering the head and foot part of a bed frame by means of a motor, the pivoting movement of the head part and the foot part taking place via pairs of swivel levers which may be connected to one another via tie rods,
characterized,
that two pivot axes (5, 6) movable about a common axis of rotation (7) are provided, with a first pivot axis (5) the pivot levers (9) for the head part (11), link plates (12) for the tie rods (14) and one Has mounting bracket (15) for a driving pressure motor and a second pivot axis (6) in addition to a mounting bracket (15ʹ) for another pressure motor also has link plates (14) for the tie rods (14), this tie rod (14) optionally on in the position of use Corresponding link plates (12 or 19) of the two pivot axes (5, 6) arranged close to one another can be fixed. 2. Device according to claim 1,
characterized,
that the two pivot axes (5,6) are arranged relative to the common axis of rotation (7) on different sides of this axis of rotation (7). 3. Device according to claim 2,
characterized,
that the axis of rotation (7) is arranged outside an imaginary plane defined by the two pivot axes (5, 6). 4. Device according to one of the preceding claims,
characterized,
that the pivot points (13,13,1) for each tie rod (14) on both pivot axes (5,6) on a common axis and close to each other. 5. Device according to one of the preceding claims,
characterized,
that the articulation points (16) of the two fastening fittings (15, 15ʹ) for the motor drives on both swivel axes (5, 6) lie on a common axis. 6. Device according to one of the preceding claims,
characterized,
that the respective connection point (28) of the pull rod (14) coincides with one end of the pivot lever (25) of the foot part (22), the common axis (29) being guided in a slide rail (8). 7. The device according to claim 6,
characterized,
that the slide rail (8) is designed as a cross-sectionally C-shaped profile rail into which a corresponding profiled, inverted C-profile (30) engages as a slide element. 8. Device according to one of the preceding claims,
characterized,
that the connecting bolt (29) between the pivot lever (25) and / or the link plate (12) and the pull rod (14) is guided in an elongated hole (31) to enable the head part (11) to advance in a synchronized single-motor swing-open mechanism.

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