Bathtub lift

Abstract

A bathtub lift (1) includes a floor plate (2), a seat plate (3) adjustable to vary the distance between the seat plate (3) and the floor plate (2), and a back plate (4) detachably arranged on the seat plate (3). The back plate (4) supports an adjustment device (5) driven by a drive (6) for adjusting the distance between the floor plate and the seat plate. A locking device (7) is configured to release the back plate (4). The back plate (4) is not arranged on the surface (8) of the seat plate (3) facing away from the floor plate (2), and a detaching of the floor plate (4) is only made possible in a floor-plate-side end position of the seat plate (3).

Claims

1. A bathtub lift, comprising: a floor plate, a seat plate adjustable to vary the distance between the seat plate and the floor plate, a back plate detachably arranged on the seat plate, a driven adjustment device, and a locking device for releasing the back plate, wherein the back plate supports the driven adjustment device for adjusting a distance between the floor plate and the seat plate with a drive, wherein the back plate is movable relative to the seat plate, wherein the locking device is arranged in a different location than a surface of the seat plate facing away from the floor plate, and wherein the back plate is only detachable while the seat plate is in an end position closest to the floor plate.

2. The bathtub lift according to claim 1, wherein the locking device comprises at least two positively locking components configured to be positively locked and released via the adjustment device.

3. The bathtub lift according to claim 2, wherein one of the positively locking components is a locking bolt arranged at the seat plate, and another one of the positively locking components is a passage opening arranged at the back plate for the locking bolt to be inserted, wherein the adjustment device varies a relative position of the at least two positively locking components to each other.

4. The bathtub lift according to claim 3, wherein the locking bolt is formed linearly movable parallel to the surface of the seat plate against a force.

5. The bathtub lift according to claim 1, wherein the seat plate and the back plate each have a respective curved sliding surface with a corresponding radius, wherein the sliding surface of the seat plate is longer than the sliding surface of the back plate.

6. The bathtub lift according to claim 1, wherein the seat plate comprises at least one stop for the back plate.

7. The bathtub lift according to claim 3, wherein the passage opening is arranged in an arm of the back plate.

8. The bathtub lift according to claim 7, wherein the arm comprises an upward sliding surface for actuating the locking bolt.

9. The bathtub lift according to claim 1, wherein the adjustment device comprises a pair of position-variable racks.

10. The bathtub lift according to claim 9, wherein the position-variable racks are supported on the floor plate in a guided manner.

11. The bathtub lift according to claim 10, wherein the back plate is adjustable relative to the seat plate at different angles between 90° and 150°.

12. A bathtub lift comprising: a floor plate, a seat plate having an adjustable distance to the floor plate, a back plate detachably arranged on the seat plate, a scissor system with scissor arms between the floor plate and the seat plate, and a driven adjustment device wherein the back plate supports the driven adjustment device for adjusting the distance between the floor plate and the seat plate, wherein the adjustment device comprises an electromotive drive with exactly one electric motor, wherein the adjustment device further comprises at least two position-variable racks, wherein a transmission operatively arranged between the drive and the at least two position-variable racks includes a plurality of toothed gears as gear drives and is configured to simultaneously drive the at least two position-variable racks synchronously wherein the scissor arms are movably guided in guides arranged on at least one of the floor plate and the seat plate, wherein the scissor arms include at least one pair of parallel scissor arms with identically orientated ends horizontally spaced apart from each other and connected to each other via a rotatably mounted shaft, wherein the guides are toothed racks and the shaft has toothed gears meshing with the toothed racks, and wherein the ends of the scissor arms are supported by the floor plate and are movably mounted on the floor plate while the toothed gears of the shaft are supported by the scissor arms and engage the toothed racks, but do not rest on the toothed racks.

13. The bathtub lift according to claim 12, wherein the at least two position-variable racks are arranged parallel to one another and equidistant to lateral edges of the back plate.

14. The bathtub lift according to claim 12, wherein the position-variable racks are supported on the floor plate.

15. The bathtub lift according to claim 14, wherein the floor plate has a region, that supports the position-variable racks in a guided manner, wherein the region is a recess, a groove, a stop or an indentation.

16. A bathtub lift, comprising: a floor plate, a seat plate having an adjustable distance to the floor plate, a back plate detachably arranged on the seat plate, a scissor system with scissor arms between the floor plate and the seat plate, and a driven adjustment device, wherein the back plate supports the driven adjustment device for adjusting the distance between the floor plate and the seat plate, wherein the adjustment device comprises an electromotive drive with exactly one electric motor, wherein the adjustment device further comprises at least two position-variable racks, wherein a transmission operatively arranged between the drive and the at least two position-variable racks includes a plurality of toothed gears as gear drives and is configured to simultaneously drive the at least two position-variable racks synchronously wherein the scissor arms are movably guided in guides arranged on at least one of the floor plate and the seat plate, wherein the scissor arms include at least one pair of parallel scissor arms with identically orientated ends horizontally spaced apart from each other and connected to each other via a rotatably mounted shaft, wherein the guides are toothed racks and the shaft has toothed gears meshing with the toothed racks, and further comprising a respective scroll wheel for each of the toothed gears, wherein the respective scroll wheel is connected to the shaft in a torque-proof manner, wherein the respective scroll wheel is configured to roll directly on the floor plate or in a guide groove in the floor plate.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) In the drawings,

(2) FIG. 1 shows a schematic view of a bathtub lift according to the present disclosure;

(3) FIGS. 2a, 2b, 2c, and 2d show a first embodiment of the present disclosure;

(4) FIG. 3 shows a rear view of the back plate with an adjustment device; and

(5) FIGS. 4a and 4b show an embodiment of a guide according to the present disclosure.

DETAILED DESCRIPTION OF THE DRAWINGS

(6) FIG. 1 shows a schematic view of a bathtub lift 1 according to the invention. The bathtub lift 1 essentially consists of a floor plate 2, which, in case of use, rests on the bathtub floor, or is spaced apart from it by means of feet, a seat plate 3 for a user, a scissor system 21 for the most stable force transmission from the used seat plate 3 to the floor plate 2, and a back plate 4, which supports a driven adjustment device 5. This adjustment device 5 is formed by a drive 6 either motorically, in particular, electromotively driven and causes a particularly vertical adjustment of the seat plate 3 relative to the floor plate 2. According to the invention, the adjustment device 5 either acts on the scissor system 21 or on the floor plate 2, in particular, on the floor plate 2 by means of a position- or length-variable body 16. By moving or extending the position- or length-variable bodies 16—for example, as a linear motor or a rack 17—along the double arrow, it varies the distance between floor plate 2 and the seat plate 3. In a retracted state of the position- or length-variable body 16, the seat plate 3 is in a position close to the floor plate; in extended state, it is in a position far away from the floor plate, wherein the position- or length-variable body 16 applies force onto the floor plate 2 in a contacting manner. For extending and retracting of the position- or length-variable body 16 in a more stable manner, a region 18 is provided in the floor plate 2, into which one end of the position- or length-variable body 16 engages and is therefore secured against slipping. The region 18 may be formed according to the invention as a recess, a groove, a stop or an indentation. According to the invention, the seat plate 3 is flat and ergonomically designed to the furthest extent possible on the upper side facing away from the floor plate 2—of the seating surface 8—so that both sitting as well as lying on the seat plate 3 is possible for the user without loss of comfort. According to the invention, no elevation is provided on this side, as it is provided in prior art for connection with the back plate 4. For this purpose, according to the invention, the back plate 4 is arranged on the seat plate 3 in a detachable manner and can be pivoted towards this.

(7) FIG. 2 shows a first embodiment of the invention in four sub-figures.

(8) In FIG. 2a, in schematic side view, a seat plate 3 with an articulated back plate 4 in two angular positions towards the seat plate 3 is shown. The surface 8 forms the seating surface, which is smooth, flat or ergonomically shaped. The locking device 7 can be recognized, which is arranged on the side in this exemplary embodiment so that the back plate 4 grips around the seat plate 3 with two arms 14. Although this arrangement is preferred, an arrangement of the locking device 7 inside or below the seat plate 3 would also be according to the invention. A locking bolt 9′ as positively locking part 9 and a passage opening 10′ as a positively locking part 10 can be recognized, which are each part of the locking device 7. This position is shown in FIG. 2b more precisely.

(9) In FIG. 2b, the coaxial arrangement of locking bolts 9′ and passage opening 10′ can be recognized. In this arrangement, the locking device 7 can be unlocked by pressing the locking bolt 9′ against a force in the direction of the seat plate 3, whereby the back plate 4 can be removed. The shown position corresponds to a position of the seat plate 3 that is the closest to the floor plate with a retracted rack, or with a rack in a position, in which it does not exert any more force onto to the floor plate.

(10) Two stops 13 as well as a curved sliding surface 11 of the seat plate 3 and a correspondingly curved sliding surface 12 of the back plate 4 can be recognized. A position of the back plate 4 is shown, in which this with the seat plate 3 encloses a maximum obtuse angle, in particular, 140°. The front stop 13 limits the lower limit of the angle, in particular, to 100°. With great advantage, the invention thus allows for a front stop 13 that increases the stability of the device. The back plate 4 with the seat plate 3 is connectable and detachable within this angular range. An assisting person therefore does not have to look for a certain angular position, thereby being of a great advantage, but rather an approximate angular position is sufficient to connect the two parts or to detach them from one another.

(11) FIG. 2c shows the locked position in a detailed view. This position is assumed automatically as soon as the adjustment device removes the seat plate 3 from the floor plate, i.e. having raised it. The seat plate 3 is pulled up from the back plate 4, which for its part, in turn, supports the adjustment device 5 provided with a drive 6, by means of which pressure is applied onto the floor plate via the extending rack 17 (see FIG. 1). According to the invention, the passage opening 10′ is designed with two axial sections with different radius, wherein the smaller radius is also greater than the radius of the locking bolt 9′. This results in a radial play of the locking bolt 9′ in the passage opening 10′ so that the back plate 4 can be lifted or removed from the seat plate 3 in general in proportion to this play. This can also be recognized by the distance between the two sliding surfaces 11, 12. In other words, a removal of the back plate 4 is only possible if the seat plate 3 is arranged as close as possible on the floor plate so a user is already in a bathtub and is secured by the bathtub walls. This also means that the seat plate 3 is pulled up to the locking bolt 9′, which are therefore dimensioned accordingly. FIG. 2d shows a partially sectioned rear view of the device according to the invention in the region of the connection of the back plate 4 and the seat plate 3.

(12) The radially stepped axial progression of the passage opening 10′ with a radially larger, outer and a radially smaller inner axial section can be recognized. Both sections are larger in diameter than the locking bolt 9′, which is, in turn, greater in diameter at its outer end than at its inner end. This embodiment of the passage opening 10′ allows for the locking bolt 9′ to be pressed and moved into a locked position, as is shown here. Furthermore, the locking bolt 9′ in the seat plate 3 received in a bore hole as well as a spring 23 can be recognized, in particular a spiral spring, which acts on the locking bolt 9′ shown and the locking bolt 9′ can be brought into its withdrawn release position against its force. Instead of the spring 23 shown, any other elastic body is also according to the invention, for example, an elastomer body.

(13) In an alternative embodiment (not shown), the locking bolt 9′ is designed to be central, in particular however, designed to be retractable at the push of a button. The retraction can be performed by an electric motor or also, for example, mechanically via an articulated rod or the like. This has the advantage that direct access to the locking device 7 located in the bathtub is not required; a reaching into the bath water by the assisting person is avoided, thereby being of a great advantage.

(14) An upward sliding surface 15 is arranged at the lower end of an arm 14 of the back plate 4, which upward sliding surface 15 causes a pressing in of the locking bolt 9′ in the case of coupling the back plate 4 to the seat plate 3 automatically. When inserting the back plate 4 from above, the locking bolt 9′ is pressed in through the upward sliding surface 15 and jumps back into a position locking both plates together as soon as the back plate 4 is pushed onto the seat plate 3 so that the passage opening 10′ is above the locking bolt 9′.

(15) A rack 17, a drive 6 as well as toothed gears 20 arranged in between are shown, which are used, on the one hand, as a transmission and, on the other hand, as a force transmission from the drive 6 to the rack 17. Being of a particularly great advantage, in this embodiment, two racks 17 are provided so that, due to their contact points spaced apart from each other on the floor plate near the feet, a particularly stable bathtub lift with maximum usage comfort results.

(16) FIG. 3 shows a schematic view of an adjustment device 5 according to the invention. The adjustment device 5 is arranged on a side of the back plate 4 facing the user so that a user can lean on the back plate 4 without obstructing the adjustment device 5 and having to suffer loss of comfort. The adjustment device 5 comprises two position- or length-variable bodies 16 and a drive 6. The drive 6 can be motorized, in particular, electromotively, or be a manual-drive system. The position- or length-variable bodies 16 are formed in the exemplary embodiment shown as racks 17, wherein the two racks 17 are equally formed in particular and are arranged in parallel to one another. For this purpose, these are arranged equidistantly to the outer sides of the back plates 4. By means of the drive 6, the bodies 16 can be varied in their position at least relative to the back plate 4. The racks 17 designed to be variably positionable via toothed gears 20 by means of the drive 6. For a uniform varying of position of both racks 17, a transmission 19 is provided, which interacts with the drive 6 and the racks 17 in the form of a plurality of toothed gears 20 in such a way that the one drive 6 drives the two racks 17 uniformly. This is solved in the exemplary embodiment shown in that the drive 6 drives a small toothed gear 20, which is effectively engages into a large toothed gear 20 in order to enable a particularly efficient force and speed transmission. A first toothed gear 20 is connected to the large toothed gear 20 in a torque-proof manner, in particular, manufactured as a single piece with it, which engages into one of the racks 17. A second toothed gear 20 engages into a first toothed gear 20, which rotates in an opposing manner towards the first toothed gear 20 and, in this way, the second rack 17 drives the first rack 17 to the same extent as the first toothed gear 20.

(17) The provision of two non-centered racks 17 instead of a single, central position- or length-variable body 16, in more difficult drive situations, has the advantage of a better distribution of the load arranged on the seat plate (not shown) onto the floor plate (also not shown) so that, on the one hand, the risk of a bending the floor plate—possibly up to the tub floor—is minimized and, on the other hand, the force application results closer to the tub-side feet of the floor plate. Simultaneously, the individual racks may have narrower dimensions than in the case of a single rack 17. Instead of the racks 17 shown in this exemplary embodiment, any other embodiment is also according to the invention that has two components adjustable to vary their effective length, for example, telescopic tubes, linear drives and the like.

(18) FIG. 4 respectively shows an embodiment of a guide 24 according to the invention. The first embodiment shown in FIG. 4a provides a groove formed within the floor plate 2 and/or seat plate 3, in which the guide 24 is arranged. In this embodiment, the guide 24 is designed as rack 27, in which a toothed gear 28 engages, which is connected to a shaft 26 rotatably mounted on the scissor arms 22 in a torque-proof manner. The shaft 26 is rotatably mounted, in particular, at the end 25 of the scissor arm 22. A scroll wheel 29 is also rigidly connected to the shaft 26, which roller is guided and/or rolls in a groove within the floor plate 2 and/or seat plate 3. Thereby, the toothed gear 28 and the scroll wheel 29 can be connected to each other. According to the invention, the load with the weight force of a user is always on the scroll wheel 29, while the toothed gear 28 only engages into the rack 27 to the extent that an orderly rolling and thereby an orderly shearing together and away of the scissor arms 22 is possible. For this purpose, the end 25 is fork-shaped so that the toothed gear 28 and the scroll wheel 29 can be arranged between the prongs of the fork-shaped end 25. With this advantageous embodiment, the stability of the bathtub lift according to the invention is again significantly increased since the scissor arms 22 are each guided in the racks 27 and can only be moved synchronously via the shaft 26. Simultaneously, the load transfer of the scissor arms 22 is carried out with advantage via the scroll wheel 29 or the groove in such a way that the stability is increased overall. Being of particular advantage, the invention provides this combination of a guide 24 and a toothed gear 28, and that being both in the floor as well as in the seat plate, thus at each end of the scissor arms 22 regardless of whether they point to the floor plate or seat plate.

(19) FIG. 4b shows an embodiment in which a guide groove 30 is provided in the floor plate 2 and/or seat plate 3, in which an end 25 of a scissor arm 22 is guided in a movable manner. The guide groove 30 is designed in such a way that the end 25 of the scissor arm 22 can only be shifted linearly at an axis. For this purpose, the floor plate 2 and/or seat plate 3 has/have a handle, at the protruding end of which the guide 24 is arranged in the form of a rack 27. In this rack 27, toothed gear 28 engages, which is arranged on a rotatable shaft 26 arranged on the scissor arms 22. Also, the guide 24 can be arranged directly on the floor plate 2 or the seat plate 3, meaning the floor plate 2 or seat plate 3 have no handle. In this case, according to the invention, all mentioned alternatives have in common that the toothed gear 28 is not loaded with the weight force of the user to the furthest extent possible, but together with the rack 27, is only used to guide 24 and thus to shear the scissor arms 22 together and apart.

(20) The following reference numerals are part of the description: 1 bathtub lift 2 floor plate 3 seat plate 4 back plate 5 adjustment device 6 drive 7 locking device 8 surface 9 positively locking part 9′ locking bolt 10 positively locking part 10′ passage opening 11 seat plate sliding surface 12 back plate sliding surface 13 stop 14 arm 15 upward sliding surface 16 position- or length-variable body 17 rack 18 region 19 transmission 20 toothed gear 21 scissor system 22 scissor arm 23 spring 24 guide 25 end 26 shaft 27 rack 28 toothed gear 29 scroll wheel 30 guide groove