Piece of seating furniture and fitting therefor

1. A piece of seating furniture comprising:

a base for setting up in a fixed position;

a seating element which is tiltable in relation to the base and having a seating surface and a carrying structure;

a leg support element which is movable in relation to the seating element and having a leg support surface and a carrying structure, the leg support element being connected to the seating element by a link gear, and the leg support element being movable between a storage position under the seating element and a use position in front of the seating element by the link gear; and

an electric motor below the seating surface, the electric motor acting on the link gear via a push rod;

wherein to connect the leg support element to the seating element, the link gear has at least one pivoting link which, during the transfer of the leg support element from the storage position into the use position, is arranged in part in a slot partially penetrating the leg support surface.

2. The piece of seating furniture as claimed in claim 1 , wherein

the electric motor is in the form of a linear motor with an extendable rotor, and the rotor is oriented in a main plane of extent of the seating element.

3. The piece of seating furniture as claimed in claim 1 , wherein

the piece of seating furniture has a backrest element with a backrest surface, said backrest element being attached to the base or to the seating element so as to be pivotable about a backrest axis.

4. The piece of seating furniture as claimed in claim 1 , wherein a movement of the seating element in relation to the base is coupled to a movement of the leg support element in relation to the seating element such that

in a first movement phase, the leg support element is transferred from the storage position into the use position, and

in a subsequent second movement phase, the seating element is tilted together with the leg support element in relation to the base while the leg support element remains in a fixed position with respect to the seating element.

5. The piece of seating furniture as claimed in claim 4 , wherein

in a position toward an end of the first movement phase and before a beginning of the second movement phase, the leg support element is oriented such a that the leg support surface drops forward.

6. The piece of seating furniture as claimed in claim 5 , wherein

in a position toward an end of the second movement phase, the leg support element is oriented such a that the leg support surface is oriented horizontally or drops rearward.

7. The piece of seating furniture as claimed in claim 1 , wherein

the link gear has at least one front pivoting link and a rear pivoting link which are each attached at one end to a seating-element-side connecting portion so as to be pivotable about first and second pivot axes differing from each other and are each attached at the other end to a leg-support-element-side connecting portion so as to be pivotable about third and fourth pivot axes differing from each other.

8. The piece of seating furniture as claimed in claim 7 , wherein

the seating-element-side connecting portion is formed by a part of the carrying structure of the seating element, the carrying structure of the seating element being provided in a fixed position with respect to the seating surface; and/or

the leg-support-element-side connecting portion is formed by a part of the carrying structure of the leg support element, the carrying structure of the leg support element being provided in a fixed position with respect to the leg support surface.

9. The piece of seating furniture as claimed in claim 7 , wherein

the push rod, via which the electric motor acts on the link gear, is connected to the link gear such that the push rod acts on the front pivoting link directly or via an additional push link, and the rear pivoting link is indirectly moved at the same time due to movement of the front pivoting link.

10. The piece of seating furniture as claimed in claim 9 , wherein

the push rod is guided displaceably on the carrying structure of the seating element, and

the additional push link is attached to the push rod so as to be pivotable about a first push link axis and the additional push link is attached to the front pivoting link so as to be pivotable about a second push link axis.

11. The piece of seating furniture as claimed in claim 10 , wherein

the push rod is guided by a slotted guide mechanism with a slotted guide track and a slotted guide slider which is movable along the slotted guide track.

12. The piece of seating furniture as claimed in claim 11 , wherein

the slotted guide track has a slotted guide track portion, the shaping of which is configured such that the first push link axis describes a circular path in relation to the carrying structure of the seating element and in relation to the second push link axis.

13. The piece of seating furniture as claimed in claim 7 , wherein

the link gear has a securing strut which is attached to the rear pivoting link so as to be pivotable about a fifth pivot axis and is attached to the front pivoting link so as to be pivotable about a sixth pivot axis,

a connecting line between the first and the third pivot axis encloses an angle of at least 15° with a connecting line between the first and the fifth pivot axis, and

a connecting line between the second and the fourth pivot axis encloses an angle of at least 15° with a connecting line between the second and the sixth pivot axis.

14. The piece of seating furniture as claimed in claim 13 , wherein

the securing strut is attached to the rear pivoting link or to the front pivoting link so as to be pivotable and displaceable to a limited extent such that the securing strut forces there to be a minimum distance between the fifth and the sixth pivot axis.

15. The piece of seating furniture as claimed in claim 1 , wherein

the base has a setting-up portion and a shiftable portion, and

a standing-up aid gear is provided between the setting-up portion, or an intermediate portion which is rotatable in relation thereto, and the shiftable portion, by which standing-up aid gear the shiftable portion is shiftable between a use position and a standing-up position, and

the standing-up aid gear has two gear links which extend rearward from the shiftable portion.

16. The piece of seating furniture as claimed in claim 15 , wherein

the two gear links extend from the setting-up portion or the intermediate portion obliquely upward in the use position of the shiftable portion and obliquely downward in the standing-up position.

17. The piece of seating furniture as claimed in claim 1 , further including

a tilting gear which can be driven by the electric motor for controlling a tilting movement of the seating element, and

the electric motor acts on the tilting gear and the link gear with a control member.

18. The piece of seating furniture as claimed in claim 17 , wherein:

the tilting gear is designed to bring about a shifting of the seating element in relation to the base during a movement of the control member from a starting position into an end position, and the tilting gear is furthermore designed such that, in at least one movement phase of the control member, a relative position of the seating element with respect to the base remains unchanged; and/or

the link gear is designed to bring about a shifting of the leg support element in relation to the seating element during a movement of the control member from a starting position into an end position, and the link gear is furthermore designed such that, in at least one movement phase of the control member, a relative position of the leg support element with respect to the seating element remains unchanged.

19. The piece of seating furniture as claimed in claim 17 , wherein

the tilting gear has a main axis which is fixed in position with respect to the seating element and with respect to the base and about which the seating element is tiltable in relation to the base, and

the tilting gear is assigned to the control member which can be pivoted about a first control member axis by the electric motor and on which a slotted guide slider is provided which, over the course of the pivoting of the control member, is movable along a slotted guide track such that the seating element is thereby tilted about the main axis.

20. The piece of seating furniture as claimed in claim 19 , wherein

the slotted guide track has a slotted guide track portion which has the shape of a circular portion with respect to the first control member axis.

21. The piece of seating furniture as claimed in claim 19 , wherein

the slotted guide track is provided on a slotted guide element, which is provided in a tilt-proof manner on the base, and

the first control member axis is provided in a fixed position with respect to the seating element.

22. The piece of seating furniture as claimed in claim 17 , wherein

the electric motor comprises a length-changeable linear motor which is coupled at one end to the carrying structure of the seating element so as to be pivotable about a first motor pivot axis and is coupled at a second end to the control member so as to be pivotable about a second motor pivot axis.

23. The piece of seating furniture as claimed in claim 22 , wherein the carrying structure of the seating element has two mutually parallel cheeks which are connected or penetrated by a pin which defines a main axis for tilting the seating element in relation to the base.

24. The piece of seating furniture as claimed in claim 23 , wherein the electric motor is arranged in an intermediate space between cheeks of the carrying structure of the seating element, or the electric motor is arranged excentrically and outside the intermediate space formed by the cheeks.

25. A fitting for a piece of seating furniture, the fitting comprising:

a base for setting up in a fixed position;

a carrying structure which is rigid for carrying a seating element of the piece of seating furniture;

a carrying structure which is rigid for carrying a leg support element of the piece of seating furniture, which leg support element is connected movably in relation to the carrying structure of the seating element,

the carrying structure of the leg support element being connected to the carrying structure of the seating element by a link gear, and the carrying structure of the leg support element is movable between a storage position under the carrying structure of the seating element and a use position in front of the carrying structure of the seating element by the link gear; and

an electric motor on the carrying structure of the seating element, the electric motor acting on the link gear via a push rod;

wherein to connect the carrying structure of the leg support element to the carrying structure of the seating element, the link gear has at least one pivoting link which, during transfer of the leg support element from the storage position into the use position, is arranged in part in a slot penetrating the carrying structure of the leg support element.