Patent Application
20240123884
This application claims priority on German Patent Application No 10 2022 126 734.2 filed Oct. 13, 2022, the entire disclosure of which is incorporated herein by reference.
The invention relates to a function-adapted three-dimensional foam structure for use in a vehicle seat, a vehicle seat comprising such a foam structure, as well as a method of producing a function-adapted three-dimensional foam structure.
Foam structures for use in a vehicle seat are known in the prior art and are used to ensure a high sitting comfort. To this end, the composition and distribution of a foam structure must be chosen to be reversibly compressible within certain limits, i.e. when pressure is applied to the foam structure, the foam structure is reversibly compressible to a certain extent. This property of a foam can be quantified using the compressive strength of a foam. The compressive strength is generally indicated in Pa or kPa and states how much pressure must be applied to a foam to compress the foam by, for example, 65%, 40%, or 25% of the starting height. A higher compressive strength indicates a firmer foam. Seat components also should allow great freedom with regard to adjustability so that the seat components can provide a targeted adjustment to individual physical conditions.
Disadvantageously, the foam structures can be difficult to adjust to the variable positioning of the seat components. Thus, for example, in the case of a length adjustment of a seat middle web or a headrest of a vehicle seat with a foam structure, there necessarily occurs undesirable thinning or bulging of the foam structure, which in turn massively changes the compressive strength of the foam structure.
Therefore, a problem addressed by this invention is to at least partially remedy the disadvantages described above. In particular, a problem addressed by the invention is to provide a three-dimensional foam structure for a vehicle seat that offers a high user comfort while being simple and cost-efficient to produce.
Technical features that are disclosed herein regarding the foam structure also apply to the vehicle seat and the method of making the foam structure, and vice versa, so that reference is or can always be made mutually with respect to the disclosure regarding the individual aspects of the invention.
One aspect of the invention relates to a function-adapted three-dimensional foam structure for use in a vehicle seat. In some embodiments, the foam structure is made via a 3D printing method. The foam structure comprises first foam structure planes to ensure a constant compressive strength of the foam structure in two spatial directions x, y, and second foam structure planes to ensure a length variance of the foam structure in a spatial direction z. The spatial direction z is perpendicular to the spatial directions x and y, and the first foam structure planes and the second foam structure planes are formed and distributed within the foam structure such that the compressive strength of the foam structure is constant in the spatial directions x, y independent of the length-wise expansion of the foam structure in the spatial direction z.
By contrast to the known foam structures for use in a vehicle seat, this disclosure provides a combination of plural first foam structure planes to ensure a constant compressive strength and plural second foam structure planes to ensure a length variance, thereby providing a targeted adjustment of foam structure properties to desired comfort requirements of a vehicle seat. The arrangement disclosed herein achieves a high variability of the foam structure in one spatial direction, but a compressibility or compressive strength purposefully is kept constant in two other spatial directions. In one aspect of the invention addition, the function-adapted three-dimensional foam structure is produced via a 3D printing method.
The function-adapted, three-dimensional foam structure described herein can be used in vehicle seats of cars or trucks. However, it is also conceivable to use the three-dimensional foam structure in seats of other vehicles or stationary objects.
Functional adaptation can be understood in the context of the invention to mean a targeted adjustment of the structure to a desired function. In the context of the invention, a spring accumulator or a spring accumulator constant can be understood as the compressive strength. When using the foam structure of the invention in a vehicle seat, the spatial direction z can represent the spatial direction of an adjustment direction of the seat, and the spatial directions x and y are transverse or perpendicular to the adjustment direction. Thus, the foam structure can have a length-independent spring accumulator across or perpendicular to a direction of adjustment due to the arrangement of planes with a spring accumulator property in combination with the arrangement of planes with a length accumulator property. Thus, the foam structure disclosed herein enables an adaptive length change in the direction of adjustment without changing a spring accumulator unit and thus can prevent thinning or bulging in case of a length variation. It should be understood that a constant compressive strength can also be understood to mean minor deviations of the compressive strength of less than 10%, preferably less than 5%, in particular less than 1%. It will further be appreciated that the spatial directions x, y, z can be understood, as part of a consideration of a foam structure within a three-dimensional coordinate system, to be the negative spatial directions −x, −y, −z. Polymers such as quick-drying polymers or polymer resins or mixtures of different polymers or polymer resins are considered as materials for the production of the foam structures of the invention.
The first foam structure planes and the second foam structure planes may be present in the foam structure in an equal number or amount to achieve a particularly exact and targeted adjustable structure property. In some embodiments, the first foam structure planes and second foam structure planes are arranged to alternate with one another in the foam structure. An alternating distribution of the first and second foam structure planes allows for a distribution of force as homogeneously as possible with respect to a length variance and a compressive strength.
Sufficient length expandability of the foam structure can be achieved by having the first foam structure planes and second foam structure planes formed and distributed within the foam structure such that the length variance of the foam structure in the spatial direction z is at least 3 times, preferably at least 5 times, in particular at least 10 times the length variance of the foam structure in the spatial directions x or y.
Sufficient compressive strength of the foam structure may be achieved by having the first and second foam structure planes formed and distributed within the foam structure such that the compressive strength of the foam structure in the spatial directions x and y is at least 3 times, preferably at least 5 times, in particular at least 10 times the compressive strength of the foam structure in the spatial direction z.
A particularly homogeneously distributed compressive strength along the surface of a foam structure may be achieved by having the first foam structure planes and second foam structure planes formed and distributed within the foam structure such that the foam structure compressive strength varies perpendicular to the spatial direction z by less than 3%, preferably less than 2%, in particular less than 1%.
The invention also relates to a vehicle seat for use in a motor vehicle. The vehicle seat may comprise a seat structure for use in a motor vehicle with a seat middle web, side wings arranged to the left and to the right of the seat middle web, and a headrest arranged above the seat middle web. The vehicle seat has a function-adapted three-dimensional foam structure as described above. The vehicle seat thus has the same advantages as already extensively described with respect to the foam structure.
Increased user comfort of a vehicle seat can be achieved when the seat structure comprises an extended adjustment region. The extended adjustment region of the seat structure may comprise a length adjustability of the seat middle web and/or a height adjustability of the headrest and/or a tilt adjustability of the headrest.
The seat structure may have a height adjustability of at least 5 cm, preferably at least 10 cm, in particular at least 13 cm and/or a backrest reclinability of at least 5°, preferably at least 8°, in particular at least 11°.
A high user comfort can be provided if the seat structure has a distance override capability in the seat middle web and/or between the side wings and the headrest.
The invention also relates to a method for producing a function-adapted three-dimensional foam structure for use in a vehicle seat, such as the foam structure described above. The method comprises the steps of selecting a desired compressive strength and length variance of the foam structure along the spatial directions x, y, z; simulating a construction and composition of the foam structure from plural first foam structure planes to ensure a constant compressive strength of the foam structure in two spatial directions x, y and plural second foam structure planes to ensure a length variance of the foam structure in a spatial direction z; producing the foam structure based on the simulation. The method according to the invention thus has the same advantages as already described with respect to the foam structure and the vehicle seat.
The invention described herein provides a simple, fast, inexpensive, and purposefully adaptable product that can be produced by a 3D printing method.
Further advantages, features, and details of the invention arise from the following description, in which examples of the invention are described in detail with reference to the drawings. The features mentioned in the claims and in the description can be essential for the invention individually or in any combination.
The foam structure 2 of
The first foam structure planes 6 and the second foam structure planes 8 can be present in the foam structure 2 in the same number or amount and can be arranged to alternate with one another in the foam structure 2.
The first foam structure planes 6 and the second foam structure planes 8 can further be formed and distributed within the foam structure 2 such that the length variance of the foam structure 2 in the spatial direction z is at least 3 times, preferably at least 5 times, in particular at least 10 times the length variance of the foam structure 2 in the spatial directions x or y.
Likewise, the first foam structure planes 6 and the second foam structure planes 8 can be formed and distributed within the foam structure 2 such that the compressive strength of the foam structure 2 in the spatial directions x and y is at least 3 times, preferably at least 5 times, in particular at least 10 times the compressive strength of the foam structure 2 in the spatial direction z.
Furthermore, the first foam structure planes 6 and the second foam structure planes 8 can be formed and distributed within the foam structure 2 such that the compressive strength of the foam structure 2 perpendicular to the spatial direction z varies by less than 3%, preferably less than 2%, in particular less than 1%.
The production 300 of the foam structure 2 in the step 300 can be carried out via a 3D printing method.
The above explanation describes the invention solely in the context of examples. Of course, if technically useful, individual features of the embodiments can be combined freely with one another without departing the scope of the invention.
| Number | Date | Country | Kind |
|---|---|---|---|
| 10 2022 126 734.2 | Oct 2022 | DE | national |
