Piece of seating furniture having a telescoping leg-rest element

Abstract

A piece of seating furniture having a seat part, a back part, a chassis, and an at least two-part leg rest pivotably. The parts of the leg rest can be slid relative to each other during the pivoting. A part of the leg rest is formed by a telescoping leg-rest element which is retracted when the leg rest is pivoted in and is extended, in order to increase the length of the leg rest, when the leg rest is pivoted out. A first articulated lever and a second articulated lever are articulated to the seat part, a third articulated lever and a fourth articulated lever are each connected to a fifth articulated lever. A coupling lever and a control lever are articulated to the first articulated lever and/or the second articulated lever and/or to the third articulated lever and/or the fourth articulated lever.

What is claimed is: 
     
         1 . A piece of seating furniture comprising:
 a seat part;   a back part;   a chassis; and   an at least two-part leg rest pivotally connected to the seat part and / or to the chassis,   wherein parts of the leg rest are adapted to slide relative to each other during a pivoting,   wherein the piece of seating furniture is adjustable between a sitting and a reclined position,   wherein, in the sitting position, the leg rest is essentially pivoted in below the seat part and in the reclined position, is pivoted out in front of the seat part such that the seat part is extended by the leg rest,   wherein a part of the leg rest is formed by a telescoping leg rest element, which is retracted when the leg rest is pivoted in and extended, in order to increase a length of the leg rest when the leg rest is pivoted out,   wherein, when the piece of seating furniture is in the sitting position, a first and / or a second articulated lever are / is articulated to the seat part and / or to the chassis and a longitudinal axis formed between the two end hinge points of at least one of the first and / or the second articulated levers is arranged at an angle to the seat part, an end hinge point of this articulated lever facing the seat part is positioned closer to a vertical plane spanned from the front edge of the piece of seating furniture than an end hinge point of said articulated lever facing away from the seat part,   wherein, when the piece of seating furniture is in the sitting position, a third and a fourth articulated lever have an orientation in which a longitudinal axis formed between the two end hinge points of at least one of the third and / or the fourth articulated levers is arranged at an angle to the seat part, an end hinge point of said articulated lever facing away from the seat part is positioned closer to a vertical plane spanned by the front edge of the piece of seating furniture than an end hinge point of said articulated lever facing the seat part,   wherein the third and fourth articulated levers, with their end hinge points facing the piece of seating furniture in the sitting position of the piece of seating furniture, are each connected to a fifth articulated lever,   wherein a coupling lever is articulated to the first and / or to the second articulated lever and / or to the third and / or to the fourth articulated lever, and   wherein a control lever is articulated to at least one of the first, the second, the third and the fourth articulated levers, and   wherein the fifth articulated lever is connected to the third and the fourth articulated lever and, with its free end, is articulated to the telescoping leg rest element.   
     
     
         2 . The piece of seating furniture according to  claim 1 , wherein during a subphase of the pivoting of the piece of seating furniture from the sitting to the reclined position, the coupling lever is lowered relative to the seat part, while all sections of the fifth articulated lever are substantially simultaneously raised relative to the coupling lever. 
     
     
         3 . The piece of seating furniture according to  claim 1 , wherein the first and the second articulated lever are hinged on the one hand to a front area of the seat part and on the other hand to the coupling lever, wherein the third and the fourth articulated lever are hinged to the coupling lever and to the fifth articulated lever, and wherein one of the third and / or the fourth articulated levers extends beyond its articulation point on the coupling lever and is articulatedly connected, at its free end, to a first end of the control lever, the second end of which is connected to a central area of one of the first and / or the second articulated levers. 
     
     
         4 . The piece of seating furniture according to  claim 1 , wherein the leg rest comprises one or more rails pivotally connected to the seat part, on which the telescoping leg rest element is disposed in a movable manner in the longitudinal direction of the rails, wherein at least one of the first and / or the second articulated levers is coupled to the telescoping leg rest element such that an adjustment of one of the first and / or the second articulated lever relative to the seat part causes a pivoting out or in of the leg rest relative to the seat part and a substantially simultaneous displacement of the telescoping leg rest element along the rails. 
     
     
         5 . The piece of seating furniture according to  claim 1 , wherein at least one of the first and / or the second articulated levers has a stop element which, during the pivoting movement of the leg rest, comes into contact with a stop surface of a seat part tab connected to the front part of the piece of seating furniture. 
     
     
         6 . The piece of seating furniture according to  claim 1 , wherein at least one linear actuator is provided for adjusting the seat part and the leg rest, wherein upon actuation, the linear actuator generates a linear stroke formed of at least one first and one second partial stroke, wherein the linear actuator, with a first partial stroke, causes a displacement of the seat part relative to the chassis as well as a substantially simultaneous tilt adjustment of the seat part, wherein during this first partial stroke of the linear actuator there is no pivoting out or in of the leg rest relative to the seat part, and wherein the linear actuator, with a second partial stroke, causes the leg rest to pivot out or in relative to the seat part as well as a simultaneous displacement of the telescoping leg rest element. 
     
     
         7 . The piece of seating furniture according to  claim 1 , wherein the linear actuator, with a partial stroke, only causes the leg rest to pivot out or in relative to the seat part without adjusting the seat part relative to the chassis and without adjusting the back part relative to the seat part. 
     
     
         8 . The piece of seating furniture according to  claim 1 , wherein the linear actuator is coupled with a first end to the chassis and with a second end to the first and / or the second articulated lever via a crossbar connected to the first or the second articulated lever. 
     
     
         9 . The piece of seating furniture according to  claim 1 , wherein the seat part, at least during a subphase of the adjustment of the piece of seating furniture from the sitting to the reclined position, is displaced forward relative to the chassis via a pivot guide, and wherein the pivot guide has a front and a rear handlebar lever, which form a four-bar linkage with the seat part and the chassis. 
     
     
         10 . The piece of seating furniture according to  claim 1 , wherein the adjustment movement of the seat part in the direction of the front edge of the piece of seating furniture is blocked by a chassis-side stop element. 
     
     
         11 . The piece of seating furniture according to  claim 1 , wherein the pivot guide is subjected to force via at least one tension spring, wherein the tension spring acts between the seat part and the chassis such that the tension spring shortens in the direction of the front edge of the piece of seating furniture during the adjustment movement of the seat part.