The invention relates to a drive for furniture for adjusting a first furniture part in relation to a second part.
Such drives are generally known and serve, for example, to adjust parts of seating furniture and/or loungers, such as lath grids for beds or of seats.
There are known drives for furniture that serve for adjusting the height and/or inclination of an upholstery element of a seat in relation to a base body of the seat, the upholstery element being configured as a seat part upon which a seat surface is formed. The known drive includes a scissor-like lifting rod, which is connected to a base body and supports the seat part. A drive operated by an electric motor is provided to adjust the lifting rod.
One disadvantage of this known drive for furniture is that it is complicated and therefore expensive to produce. Another disadvantage is that the known drive requires much space, especially beneath the seat part.
An object of the invention is to provide a drive for furniture for adjusting a first part of the furniture in relation to a second part of the furniture, which does not have the disadvantages of known drives, which is simple and cost-effective to produce, and which is configured to save space.
These and other objects are achieved by the teachings and embodiments of the invention set forth herein.
The basic concept of the teachings according to the invention is to provide a pivot shaft drive for adjusting the inclination of a first part, such as a seat part of a seat, in relation to a second part, such as a base body of the seat, and/or the distance of the first part to the second part. For this, there is provided according to the invention at least one pivot shaft, which is associated with a pivot drive and is pivotally mounted on the first part. According to the invention, there is furthermore provided at least one supporting element, which is mechanically linked to the pivot shaft and thanks to which the first pivot shaft supports itself on a supporting surface provided on the second part in such a way that the inclination of the first part in relation to the second part and/or the distance of the first part to the second part can be adjusted by swiveling the pivot shaft.
If the drive for furniture serves, for example, to adjust the inclination of a seat part in relation to a base body of a seat, then, because of the fact that the pivot shaft supports itself on the supporting surface by means of the supporting element or elements, the vertical distance of the pivot shaft from the supporting surface will change when the pivot shaft swivels so that the inclination of the seat part and its distance to the supporting surface are adjusted, thereby adjusting its height.
If according to the invention there is provided, for example, one single pivot shaft that is mounted on an end of the seat part while the other end can swivel around a stationary swiveling axis, then the inclination of the seat part in relation to the supporting surface and therefore in relation to the base body of the seat can be adjusted by means of the drive for furniture according to the invention. If, in contrast, the end of the seat part facing away from the pivot shaft is not mounted on a stationary swiveling axis, but movably mounted by means of a sliding block guide for example, then, by using an appropriate pivoting mechanism, it is possible to adjust not only the inclination but also the height of the seat part in relation to the base body by means of a single pivot shaft.
If, in particular and for example, at least two pivot shafts spaced apart from and parallel to each other are provided with one pivot drive associated with each, then both the height and inclination of the seat part can be adjusted by means of the pivot shafts.
The inventive drive for furniture is simple and cost-effective to produce and saves a significant amount of space. In particular, the drive according to the invention has a particularly small overall height in terms of the pivot shaft and its associated pivot drive.
The drive for furniture according to the invention is suitable for adjusting parts of any furniture, for adjusting parts of a lath grid in relation to each other, for example. The drive according to the invention is particularly good for adjusting parts of seating furniture, especially seats, in relation to each other.
It is basically sufficient according to the invention to provide a single pivot shaft to adjust the inclination of the first part in relation to the second part and/or the distance of the first part to the second part. In an extraordinarily advantageous further development of the teaching according to the invention, however, it is provided that another pivot shaft is provided, this other pivot shaft being spaced apart from and parallel to the pivot shaft and pivotally mounted on the first part and associated with a pivot drive, whereby at least one further supporting element mechanically linked to the other pivot shaft is provided, said supporting element supporting itself in such a way on a supporting surface provided on the second part that the inclination of the first part can be adjusted in relation to the second part and/or the distance of the first part from the second part can be adjusted by swiveling the other pivot shaft. This embodiment results in versatile adjusting options in a simple manner.
If the drive for furniture according to the invention serves, for example, to adjust a seat part of a seat, and if both pivot shafts have the same vertical distance from their respective supporting surface in a start position then, by swiveling the pivot shafts in such a way that the vertical distances of both pivot shafts from their respective supporting surfaces increase by the same amount, the distance of the seat part to the supporting surface, and therefore its height, is adjusted. Here the inclination of the seat part remains unchanged. If one of the pivot shafts is swiveled, thereby increasing or decreasing its vertical distance to its associating supporting surface, while the other pivot shaft is not swiveled, thereby keeping its vertical distance to its associated supporting surface the same, then the inclination of the seat part is adjusted. If, in contrast, the pivot shafts are swiveled in such a way that the vertical distance of both pivot shafts from their respective supporting surface is increased or decreased, then the inclination of the seat part is adjusted.
It is basically sufficient according to the invention to associate only one supporting element to the pivot shaft or other pivot shaft. In an advantageous further development, however, it is provided that at least two supporting elements, which are spaced apart from each other in the axial direction of the respective pivot shaft, are associated with the pivot shaft or at least one of the pivot shafts. This reduces or prevents a camber of the pivot shaft far away from the supporting elements. In the above embodiment, in which another pivot shaft is provided in addition to the pivot shaft, it is particularly advantageous to associate two supporting elements with each of the pivot shafts. In this embodiment, the first part supports itself on four points on the second part. If necessary in accordance with the respective requirements, it is also possible to provide more than two supporting elements per pivot shaft.
In an advantageous further development of the aforementioned embodiment, it is provided that the supporting elements associated with one pivot shaft are mounted on the axial ends of the pivot shaft. In this embodiment, the space between the supporting elements in the radial direction of the pivot shaft remains free, so that the drive saves a significant amount of space.
In another advantageous further development of the teaching according to the invention, it is provided that at least one of the supporting elements includes a journal in the vicinity of the end that is facing away from its associated pivot shaft, this journal guiding the respective supporting element on or into a guide provided on the second part. This embodiment results in a particularly simple construction, wherein it is particularly advantageous that the supporting surface can be mounted next to the respective pivot shaft in the axial direction. If, for example, the first part is a seat part and the second part is a base body of a seat, then the supporting surface associated with a supporting element can, for example, be provided in an armrest of a seat next to the respective pivot shaft in the axial direction, so that the space underneath the seat part remains free.
In advantageous further embodiments of the aforementioned embodiments, it is provided that the journal extends essentially parallel to the axial direction of the associated pivot shaft and/or that the guide is configured as a groove or slot.
In another further development of the embodiment with the journal, it is provided that the open end of the journal points away from the axial center of the associated pivot shaft. If two supporting elements are associated with one pivot shaft, for example, to adjust a seat part in relation to a base body of a seat, then in this embodiment the journals of the supporting elements will point away from each other, whereby the journals can be guided into guides, for example, which are provided in mutually facing surfaces of armrests of the base body. This embodiment results in a construction that saves a significant amount of space, because the space underneath the pivot shaft and therefore the space underneath the seat part is free of parts of the adjustment mechanism. Only the supporting elements project out of the seat part, and they indeed project at the axial ends of the pivot shaft. Since the supporting elements can thus be mounted in the vicinity of the armrests, for example, they will not be visibly perceived or will barely be perceived and not felt as disturbing.
The guide can basically have any shape corresponding to the desired kinematics, a curved shape for example. Advantageously, however, the guide runs essentially straight. This embodiment is particularly simple and therefore cost-efficient to produce.
In another further development of the invention with the guide, it is provided that the longitudinal axis of the guide runs essentially parallel to an imaginary connecting line between the pivot shaft and the other pivot shaft. This embodiment results in particularly simple kinematics.
The supporting element or elements can be configured in any suitable way. In one advantageous further development, it is provided that the supporting element or at least one of the supporting elements is configured as a lever, especially a pivoted lever.
According to the invention, the supporting element can be mechanically linked to the associated pivot shaft in any suitable way. For example, the supporting element can be connected to the associated pivot shaft by means of a toothed gearing, so that a swiveling of the pivot shaft corresponding to the transmission ratio of the gearing leads to a swiveling of the supporting element. To arrange the construction in a particularly simple and therefore cost-efficient manner, one advantageous further development provides that the supporting element or at least one of the supporting elements is connected to the associated pivot shaft in a nonrotatable fashion.
To further reduce the space requirement of the drive for furniture according to the invention, one advantageous further development provides that the supporting element or at least one of the supporting elements is configured flat in the axial direction of the associated pivot shaft.
A manual pivot drive can basically be provided as pivot drive. Advantageously, however, the pivot drive or at least one of the pivot drives is configured to be operated by an electric motor. In this embodiment, the adjustment of the first part in relation to the second part is configured to save strength and to be comfortable.
If more than one pivot shaft is provided according to the invention, then it is possible to provide a common pivot drive according to the invention to swivel the pivot shafts. One advantageous further development of the teaching according to the invention provides that the pivot shaft and the other pivot shaft are each associated with a separate pivot drive in such a way that the pivot shafts swivel independently of one another. In this embodiment, the controls of the pivot drives associated with the pivot shafts can be independent of one another. The control can also be a common control, however, so that predefined kinematics is achieved when adjusting the first part in relation to the second part, for example.
One further development of the embodiment with the pivot drive operated by an electric motor provides that the pivot drive or at least one of the pivot drives is configured as a linear drive comprising an output member moving along a linear axis of motion. These types of linear drives are available as simple and cost-efficient standard components and are suitable for applying large forces. These linear drives may further include other electromechanical drives, depending on the requirements and intended use.
One advantageous further development of the teaching according to the invention provides that the output member is a spindle nut of a spindle drive, the spindle nut being mounted mobile in the axial direction and secure from twisting on a threaded spindle that can be driven in rotation. These types of spindle drives are available as simple and cost-efficient standard components and are suitable for applying large forces.
In a kinematic reversal of the above embodiment, the output member can also be includes a threaded spindle, which is mounted mobile in the axial direction and secure from twisting and upon which there is mounted a stationary spindle nut that can be driven in rotation.
Advantageous means for converting a linear movement of the output member into a swivel movement of the respective pivot shaft are advantageously provided in the above embodiments.
To engineer the means for converting a linear movement of the output member into a swivel movement of the respective pivot shaft in a particularly simple, cost-effective and robust way, an advantageous further development provides that the means for converting a linear movement of the output member into a swivel movement of the respective pivot shaft include a crank-drive-like fitting arrangement, by means of which the output member has a drive connection with the respective pivot shaft.
In the above embodiment, the crank-drive-like fitting arrangement advantageously includes a control lever connected to the respective pivot shaft in a nonrotatable fashion, one end of a connecting-rod-like connecting element being eccentrically connected to the pivot shaft by means of this control lever and the other end being articulated connected to the output member.
Another particularly advantageous further embodiment of the teaching according to the invention provides that the furniture is a seating furniture, particularly a seat, that the first part includes an upholstery element, especially a seat part of the seating furniture, and that the second part includes at least one armrest arranged to the side of the upholstery element in the axial direction of the pivot shaft.
One advantageous further development of the abovementioned embodiment provides that the armrest or at least one of the armrests is configured planar and that the guide is provided in an area of the armrest facing the other armrest.
The invention will be described in more detail below based on the enclosed drawing which presents an exemplary embodiment of a drive for furniture according to the invention. All features described or presented in the drawing in themselves or in any combination form the subject matter of the invention, independently of their combination in the claims or their references back and independently of their wording and representation in the description and drawing, respectively.
Relative terms such as up, down, left, and right are for convenience only and are not intended to be limiting. The term furniture and piece of furniture are to be understood as being interchangeable.
The pivot shaft 20 is mechanically linked to a supporting element, in this exemplary embodiment the connection being provided by a pivoted lever 26, whose one end is connected to the pivot shaft 20 in a nonrotatable fashion and which includes a journal 28 in the vicinity of its end facing away from the pivot shaft 20, this journal guiding the pivoted lever 26 into a guide provided in the armrest 10 in a manner explained in more detail below. In this exemplary embodiment, the journal 28 extends essentially parallel to the axial direction of the associated pivot shaft 20, whereby the open end of the journal 28 points away from the axial center of the pivot shaft 20.
In
As evident in
An electromechanical pivot drive operated by an electric motor is provided to swivel the pivot shaft 20 and thereby the pivoted lever 26 and the other pivoted lever, this pivoted drive including a drive unit 29 with an electric motor 30 as drive motor, the drive shaft of which, not evident in
In this exemplary embodiment, element(s) according to the invention for converting a linear movement of the output member along the linear axis of motion into a swivel movement of pivot shaft 20 are provided, in this exemplary embodiment this element including a crank-drive-like arrangement 40 that provides a drive connection between the spindle nut 36 and its associated pivot shaft 20. In this exemplary embodiment, the crank-drive-like arrangement 40 includes a control lever 42 which is connected to the pivot shaft 20 in a nonrotatable fashion, one end of a connecting-rod-like connecting element 40 being eccentrically connected to the pivot shaft 20 by means of this control lever and the other end being connected articulated to the spindle nut 36 and eccentric to the pivot shaft 20.
In the exemplary embodiment illustrated in the drawing, the drive for furniture 18 includes another drive unit or further drive 29′, which is essentially constructed in the manner described above for the drive unit 29.
The components of the other drive unit 29′ are provided with reference signs that correspond to the reference signs of components of drive unit 29.
The other drive unit 29′ includes another pivot shaft 20′, which is pivotally mounted on the longitudinal bars 22, 24 of the seat part 4. Another pivoted lever 26′ is connected to the other pivot shaft 20, the end of the pivoted lever 26′ facing away from the pivot shaft 20′ including a journal 28′ by means of which the other pivot shaft 20′ supports itself on a supporting surface by means of the other pivoted lever 26′. The other drive unit 29′ includes a linear drive configured as a spindle drive and comprising a spindle drive, the spindle nut 36′ of which constitutes the output member of the linear drive and is mounted on a threaded spindle 34′, which can be driven in rotation and is connected in a nonrotatable manner to a worm wheel 32′, which engages the drive shaft of an electric motor 30′, said drive shaft being configured as a worm.
Power supply means, which are not illustrated in the drawing, are provided to supply power to the drive units 29, 29′ and control means, which are not illustrated in the drawing, are provided to control the drive units 29, 29′. In this exemplary embodiment, the control means are configured in such a way that the drive units 29, 29′ can be driven independently of each other.
Another supporting element in the form of another pivoted lever 46′, which is constructed as described above for pivoted lever 46′ on the basis of
The method of operation of the inventive drive for furniture will be described below in connection with FIGS. 4 to 7.
At the same time, the electric motor 30′ of drive unit 29′, which can be seen in
If the drive unit 29 and drive unit 29′ are driven synchronously, then the seat part is lowered out of the raised adjustment position depicted in
Another lifting of the seat part 4 into the raised position is accomplished by driving the drive unit 29, 29′ oppositely. During a synchronous drive of the drive units 29, 29′, the inclination of the seat part 4′ remains constant during the height adjustment.
If the inclination of the seat part 4 is to be adjusted in relation to the base body 6, this can be accomplished for example, by only driving the drive unit 29 while the drive unit 29′ remains stopped so that, proceeding from the adjustment position depicted in
The drive for furniture 18 according to the invention is simple and cost-effective in construction and robust. A special advantage is that only pivoted levers 26, 26′ and 46, 46′, which are very narrow in the axial direction of the pivot shafts 20, 20′, protrude toward the underside of the seat part 4. The pivoted levers 26, 26′ and 46, 46′ are located in the direct vicinity of armrests 6, 8 and will not be visibly perceived or will barely be perceived both in the raised position of seat part 4 depicted in
While this invention has been described as having a preferred configuration, it is understood that it is capable of further modifications, and uses and/or adaptations of the invention and following in general the principle of the invention and including such departures from the present disclosure as come within the known or customary practice in the art to which the invention pertains, and as may be applied to the central features hereinbefore set forth, and fall within the scope of the invention or limits of the claims appended hereto.
Number | Date | Country | Kind |
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103 01 326.1 | Jan 2003 | DE | national |
This application is a continuation of application no. PCT/EP2005/000302, filed Jan. 14, 2005, which is a continuation of application no. PCT/EP2004/000244, filed Jan. 15, 2004, and which claims priority of German application no. 103 01 326.1, filed Jan. 15, 2003, and each of which is incorporated herein by reference.
Number | Date | Country | |
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Parent | PCT/EP05/00302 | Jan 2005 | US |
Child | 11486068 | Jul 2006 | US |
Parent | PCT/EP04/00244 | Jan 2004 | US |
Child | PCT/EP05/00302 | Jan 2005 | US |