Classifications

• • A—HUMAN NECESSITIES
  • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
  • A47C—CHAIRS; SOFAS; BEDS
  • A47C7/00—Parts, details, or accessories of chairs or stools
  • A47C7/36—Supports for the head or the back
  • A47C7/38—Supports for the head or the back for the head, e.g. detachable
• • A—HUMAN NECESSITIES
  • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
  • A47C—CHAIRS; SOFAS; BEDS
  • A47C17/00—Sofas; Couches; Beds
  • A47C17/04—Seating furniture, e.g. sofas, couches, settees, or the like, with movable parts changeable to beds; Chair beds

Definitions

• a piece of seating furniture has a headrest that can be guided and displaced between a storage position and a use position.
• the headrest is preferably also padded.
• a preferably padded headrest body of the headrest has a flat shape with a substantially flat front headrest surface that is oriented substantially vertically in the use position of the headrest.
• the headrest surface of the headrest preferably has a minimum area of 40 cm x 25 cm.
• the thickness of a headrest body of the headrest is preferably less than 20 cm, in particular less than 15 cm.
• a headrest rod is preferably provided, which is attached to an inner frame of the headrest and firmly connects the headrest to a headrest support that is movable for the purpose of displacing the headrest.
• the headrest In the use position, the headrest is positioned above the backrest. In the stowed position, however, the headrest is lowered and located in a space behind the backrest.
• the guide mechanism has a design that allows for a shallow construction.
• the total depth of the guide mechanism including an associated mounting flange for attachment to a supporting structure and excluding the headrest itself and its headrest rods, is less than 50 cm in any phase of movement.
• the guide mechanism comprises a mounting flange for attachment to a supporting structure of the seating furniture.
• the mounting flange can, in particular, have a cheek configured as a sheet metal part or two such opposing cheeks that are attached, e.g., screwed, to the supporting structure of the seating furniture.
• the guide mechanism also includes a headrest support to which the headrest is attached and which is guided and movable relative to the mounting flange.
• At least one of the pivot arms is designed as a length-adjustable pivot arm.
• the proximal end and the distal end of this length-adjustable pivot arm can be displaced relative to one another along a movement path mechanically predetermined by the pivot arm itself.
• the first and third, or the second and fourth, pivot axes are at a maximum distance from one another.
• the first and third, or the second and fourth, pivot axes are at a minimum distance from one another.
• not just one of the pivot arms is variable in length, but both pivot arms.
• two control link guides are also provided corresponding to the two variable-length pivot arms, wherein each of the control link guides is assigned to one of the two variable-length pivot arms in such a way that the respective variable-length pivot arm is varied in length during pivoting relative to the mounting flange by the assigned control link guide, in particular, is initially shortened and then extended again.
• control links of the two control link guides preferably have an upwardly diverging course, so that link bodies arranged in the control links are further apart from each other in the horizontal direction in an upper end position than in a lower end position.
• Controlling the extension of at least one length-adjustable pivot arm allows the movement sequence to be controlled in such a way that the headrest is guided just past the backrest during transfer from the stowed position to the use position and is then shifted forward, whereby the headrest reaches the use position, in which it adjoins the contact surface of the backrest in an ergonomically advantageous manner.
• the control link which controls the change in length of an upper of the two pivot arms is shaped in such a way that the increase in length of this upper pivot arm in a final phase of the transfer movement is less than the change in length of the lower of the two pivot arms. This ensures that in the final phase of the movement the headrest support pivots forward, i.e. clockwise when viewed from the left onto the piece of seating furniture. This headrest support movement is desired in order to pivot the headrest forward into the use position towards the end of the movement.
• the guide mechanism is preferably designed in such a way, in particular by the shape of at least one control link of the at least one control link guide, that when the headrest is transferred from the stowed position to the use position, the following two movement phases are passed through successively:
• a first movement phase the headrest is raised from its stowed position.
• the headrest overcomes at least 80% of the vertical distance between the position of the headrest in the stowed position and the position of the headrest in the use position, and the headrest is not pivoted forward to any significant extent during this first phase. Instead, the headrest can even be pivoted backwards during this first phase, or not pivot at all. Pivoting forwards is also possible, but by a small angle of no more than 10°. This behavior allows the headrest to be guided past the backrest without colliding with the rear during the first movement phase.
• a second movement phase once the headrest has passed the backrest without collision, it is displaced vertically by a maximum of 20% of the vertical distance between the position of the headrest in the stowed position and the position of the headrest in the use position, with the headrest being pivoted forward by at least 15° during this second phase.
• the headrest assumes a position and orientation that is suitable for use, in particular with the headrest surface aligned vertically.
• this relatively strong pivoting movement of the headrest in the second movement phase can be achieved in particular by controlling the extension of the two pivot arms in such a way that in the second movement phase, the lower of the two pivot arms is extended to a greater extent than the upper of the two pivot arms by means of the associated control link.
• the described elements of the guide mechanism in particular the first and second pivot arms, have each been described in the singular. In practice, however, it is advantageous if at least some of the elements are provided in duplicate, namely on two end subassemblies of a furniture fitting, relative to the transverse direction of the furniture.
• the guide mechanism is formed by these two external subassemblies.
• Each of the subassemblies preferably has a fastening flange as well as two pivot arms and at least one control link guide, whereby the respective left- and right-hand pivot arms of both subassemblies always move together.
• At least one pivot arm on a first of the two subassemblies is preferably connected to the corresponding pivot arm on the second subassembly by a torsionally rigid connection, in particular by a torsion tube.
• a torsionally rigid connection in particular by a torsion tube.
• the connecting strut can preferably also be designed as a connecting tube.
• the headrest body can be permanently connected to the aforementioned rod. It is also possible to provide limited manual adjustment, allowing a user, for example, to pivot the headrest body slightly further forward to allow a comfortable reading position.
• Fig. 1 and 2 show a piece of seating furniture 10 according to the invention in the form of an armchair with a seat 14 and a backrest 16. Not shown in the figures is a leg rest that can be extended in front of the seat 14.
• a guide mechanism 100 is provided, the elements of which are determined by the Figs. 3 and 4 be explained first.
• the two control links through their respective paths, allow the specific pivot position of each pivot arm 130, 140 to be determined, and to what extent, in which pivot position of the respective pivot arm 130, 140 the distal arm segment should be extended. Since the distal arm segments 136, 146 are themselves pivotally connected to the headrest support 150, the control links of the control link guide 112, 114 indirectly determine the orientation of the headrest in which phase of extension.
• the condition of the Fig. 5A is the initial state with the headrest 20 retracted. In this state, the headrest 20 is located completely within the receiving space 18.
• the pivot arms 130, 140 are each pivoted downwards and fall backwards from the pivot axes 132A, 142A. Due to the respective shape of the control links of the control link guide 112, 114 and the link bodies 113, 115 arranged therein, the distal arm segments 136, 146 of both pivot arms 130, 140 are in their maximum extended state in order to place the headrest support 150 as far down as possible in the receiving space 18 in this state. Due to this arrangement, it is achieved that even a comparatively tall headrest body of the headrest 20 can be stored completely within the receiving space of the relatively flat piece of seating furniture 10.
• the push rod 164 of the linear actuator 160 is extended. As can be seen from the Fig. 5B As can be seen, this initially leads to the lower pivot arm 130 being pivoted clockwise. Due to the shape of the control link of the control link guide 112, the pivot arm 130 is also shortened at the same time.
• the screen 18A continues to be held open by the headrest 20, whereby it no longer rests against the top of the headrest body, but against its rear wall.

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• Health & Medical Sciences (AREA)
• General Health & Medical Sciences (AREA)
• Nursing (AREA)
• Chair Legs, Seat Parts, And Backrests (AREA)

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Family

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Family Applications (1)

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Citations (3)

• 2024
  • 2024-01-10 EP EP24151210.2A patent/EP4585104A1/fr not_active Withdrawn

Patent Citations (3)

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