EP3157388B1 - Rotatable piece of seating furniture - Google Patents

Description

The invention relates to a seat piece of furniture with a base and a seat unit, wherein between the base and the seat unit a rotary bearing comprising a base-side bearing means and a seating unit side bearing means is provided by means of which the seat unit is rotatable about a vertical axis relative to the base. In this case, the rotary bearing on a switchable blocking device, by means of which the rotational mobility of the storage facilities is mutually blocked.

The invention also relates to a fitting for such a piece of seating furniture.

Generic seating furniture pieces are known from the prior art. These are seat furniture pieces whose seat unit is basically rotatable relative to a base, wherein the base can be both a foot provided for stationary installation and a base portion provided with rollers. The latter is well known in particular office seating furniture. The rotational mobility of the seat unit allows the seated person to rotate the seat unit without twisting the base, thus assuming a seated position with a changed orientation.

The pivot bearing, which is provided for this purpose between the base and the seat unit, is provided in the case of generic seating furniture pieces with a blocking device that the base and the seat unit in a given relative rotational position coupled to each other so that a rotational movement is no longer possible or strong is difficult.

The aforementioned blockability is particularly useful if it is a piece of seating furniture with a stand-up. Such a stand-up aid makes it possible to raise the seat unit in particular by an electric motor, so that getting up from the piece of seating furniture is facilitated. In the phase of getting up a rotational movement of the seat unit is generally not desired. The blocking prevents when rising, that it comes to falls due to the rotational movement of the seat unit.

Known designs for creating a switchable blocking device are comparatively expensive. For example, it has been proposed to provide such a blocking device by means of an additional electric motor which can displace a locking member into a position in which it positively couples the seat unit and the base to one another.

In this and other known solutions, however, it is always a disadvantage to note that these are accompanied by rather expensive additional components and in some cases do not provide the desired reliability.

From the post-published DE 102014204401 A1 is a generic piece of seating furniture known, in which a frictional connection is realized via a coil spring which can be contracted and contracted in the circumferential direction and expanded. This solution leads to the desired functionality, but is sometimes difficult to handle during assembly, since the expansion of the spring during assembly can cause difficulties.

Furthermore, generic seating furniture pieces have become known in which a plan serration is provided as a plan-trained locking on coming into abutment locking discs for locking the rotational movement of the storage facilities.

A piece of seating furniture according to the preamble of claim 1 is made CN 102 529 756 A and GB 2 430 009 A known.

TASK AND SOLUTION

The object of the invention is to develop a generic piece of seating furniture or a fitting for such a piece of seating furniture to the effect that the switchable blocking device is inexpensive and reliable and ensures easy mounting.

According to the invention, a piece of seating furniture according to claim 1 and a fitting for a piece of seating furniture according to claim 8 is proposed. The dependent claims define advantageous or preferred embodiments of the invention.

According to the invention, the blocking device is designed for the positive coupling of the bearing devices. It has two profiles for this purpose, which are interspersed in each case for positive coupling with each other, so that one of the profiles forms an inner profile, which is surrounded in this inserted relative position of the outer profile. The inner profile and the outer profile are each rotatably connected to one of the two storage facilities, so that they are rotatably coupled in a state in which they are non-rotatably coupled to each other, the two storage facilities and thus also the base and the seat unit.

For the purpose of producing this rotary coupling by case, the outer profile and the inner profile are mutually displaceable in the direction of the vertical axis, so that they are thereby axially movable between a form-fitting rotationally coupled engagement relative position and a release relative position.

In a seating piece of furniture according to the invention is thus provided that the axial relative movement of an inner inner profile and an outer outer profile allows the change between a rotationally coupled and a released position. The profiles have in each case with respect to their extent in the vertical direction over a constant and deviating from the circular cross-section, wherein the inner cross section of the outer profile and the outer cross section of the inner profile are adapted to each other such that they are in engagement prevent a rotational movement.

The design with profiles is also advantageous because this allows an unanspruchsvolles coupling. Unlike, for example, in a Hirth toothing, the rotary coupling is not only achieved in a defined axial end position, but is always given when the profiles are in engagement with each other.

The coordinated concrete outer contour of the inner profile and inner contour of the outer profile can be realized in many ways. Preferably, they are matched to one another such that the rotationally coupled engagement relative position is possible not only in a certain or a few rotational positions of the seat unit to the base, but in a variety of relative positions, preferably in at least 30 different relative positions. Such a multiplicity of possible engagement relative positions can be realized particularly advantageously by a spur toothing. Therefore, in a preferred embodiment, the outer profile is formed as an inner toothed outer profile and / or the inner profile as an externally toothed inner profile.

For the purpose of taking place in the vertical direction of relative movement of the outer profile and the inner profile for the purpose of producing the engagement relative position and the release relative position, a switch carrier is preferably provided, on which the inner profile or the outer profile is attached. This switch carrier is permanently rotatably provided on the seat unit or the base, but in particular with respect to the seat unit, but displaceable in the vertical direction relative to the seat unit or the base, in particular by means of a sliding guide acting in the vertical direction.

By such a configuration, the switching operation between the engaging relative position and the release relative position can be carried out by the switch carrier relative to the component to which it is associated, in particular with respect to the seat unit, guided vertically and thereby engaged or disengaged from the other Profile arrives.

In order to make the displacement of the switch carrier particularly simple, a spring device is preferably provided, by means of which the switch carrier is permanently subjected to a force in the direction of a first end position. For the purpose of movement in the opposite direction, a force introduction surface on the switch carrier or on the associated part is provided, by means of which the switch carrier can be subjected to a force against the force of the spring device in the direction of an opposite second end position.

In this case, one of the end positions, preferably the first end position of the shift carrier, which may be formed by a stop or the like, preferably provided such that in this end position, the outer profile and the inner profile are arranged in the rotationally coupled engagement relative position. The spring device thus causes in such an embodiment that the elimination of an introduction of force to the force introduction surface produces the rotationally coupled state of the profiles, while for releasing the profiles and to achieve the release relative position, a force on the force application surface is required.

However, it is also an embodiment possible and depending on the configuration of the seat piece of furniture expedient in which it requires a force on the force introduction surface to produce the rotationally coupled state, while the spring device automatically causes displacement of such a force displacement of the profiles in the release relative position , According to the invention, the piece of seating furniture has a stand-up assistance function by means of which a seat surface on the seat unit can be raised. In this case, the blocking device is operatively coupled with this stand-up so that it occupies its blocked state upon actuation of the stand-up aid function, so get the profiles in the rotationally coupled engagement relative position. This can be achieved in particular by activating the stand-up aid function, which causes or eliminates the application of force to the force introduction surface. It is particularly advantageous if an actuating portion on the seat unit is spaced by activating the Aufstehhilfe function of the force introduction surface on the switch carrier and therefore this allows the displacement due to the application of force by the spring means in the direction of the first end position.

Alternatively or additionally, it can be provided that the piece of seating furniture has an operating lever for manual actuation, by means of which the blocking device can be switched, in particular by an axial displacement of the switching carrier. Thus, regardless of a possibly existing Aufstehhilfe function, a locking of the seat unit relative to the base in a desired rotational position.

The invention also relates to a fitting for a piece of seating furniture which has the fitting-specific features according to the above-described seat piece of furniture and optionally the aspects described as optional.

BRIEF DESCRIPTION OF THE DRAWINGS

Fig. 1a und 1b

ein erfindungsgemäßes Sitzmöbelstück in perspektivischer Ansicht und Seitenansicht in einem Nutzzustand,

Fig. 2a und 2b

das Sitzmöbelstück der Fig. 1a und 1b in perspektivischer Ansicht und Seitenansicht in einem angehobenen Zustand zum erleichterten Aufstehen,

Fig. 3a und 3b

die Drehlagerung des Sitzmöbelstücks mitsamt Blockiereinrichtung im Nutzzustand,

Fig. 4a und 4b

die Drehlagerung des Sitzmöbelstücks mitsamt Blockiereinrichtung bei angehobenem Zustand des Sitzmöbelstücks, und

Fig. 5

die Drehlagerung mitsamt Blockiereinrichtung in einer Explosionsdarstellung.

Further aspects and advantages of the invention will become apparent from the claims and the following description of a preferred embodiment of the invention, which is explained with reference to the figures. Hereby show:

Fig. 1a and 1b

an inventive piece of seating furniture in a perspective view and side view in a working condition,

Fig. 2a and 2b

the piece of furniture of the Fig. 1a and 1b in a perspective view and side view in a raised state to facilitate getting up,

Fig. 3a and 3b

the pivot bearing of the piece of seating furniture together with blocking device in the working condition,

Fig. 4a and 4b

the pivot bearing of the seat piece of furniture together with blocking device in the raised state of the seat piece of furniture, and

Fig. 5

the pivot bearing and blocking device in an exploded view.

DETAILED DESCRIPTION OF THE EMBODIMENTS

Fig. 1a shows a seat piece of furniture according to the invention, wherein in the context of the present invention subordinate components are only indicated by dashed lines.

The seating furniture has a base 20 for the purpose of setting up the seating furniture. It also has a seating unit 10 which is disposed above the base 20 and provides a seating surface 12. The seat unit 10 is rotatable relative to the base about a rotation axis 2. For this purpose, it has a rotary bearing 30 with a seat-side bearing means 32 and a base-side bearing means 34. The pivot bearing 30 is associated with a blocking device 40, through which the rotation of the seat unit 10 relative to the base 20 can be prevented, as explained below.

The peculiarity of the embodiment lies in particular in the fact that the piece of seating furniture has a stand-up assistance function. This is based on the Fig. 2a explained. At a lower fitting portion 20a, which also includes the seat unit side bearing means 32 in the manner described below, two tabs 22a, 22b are provided which connect the segment 20a with a segment 24, on which the seat surface 12 is provided. By means of an electric motor, it is possible to bring about an introduction of force into these lugs 22a, 22b, whereby they are subjected to force in such a way that the segment 24 together with the seating surface 12 is lifted. A person sitting on the seat piece of furniture is thereby facilitated getting up.

In particular, in connection with such functionality, the presence of the blocking device 40 is expedient, since during rising, so in the state of Fig. 2a and 2b , a rotational mobility of the seat unit 10 relative to the base 20 about the axis 2 is not desired.

The Fig. 3a, 3b, 4a and 4b can be seen how blocking device 40 is designed and with the in the Fig. 2a and 2b clarified stand-up is operatively coupled.

Fig. 3a shows the pivot bearing 30 and the blocking device 40 in a front view. Fig. 3b shows the components in a perspective from diagonally below.

On the side of the seat unit 12 is the designated fitting segment 20a, which has a cross member connecting two lateral cheeks, which simultaneously forms the seating unit side storage device 32. On the side of the base 20 corresponding to the base-side support means 34 of the pivot bearing 30 is provided.

Furthermore, an externally toothed profile section 50b is provided on the side of the base 20, which is rotatably connected to the base 20 and is thus not rotatable relative to this. The columnar portion of the base 20, on which this tooth profile 50b is provided, is surrounded by a switch carrier 42. This switch carrier 42 is guided by means of two sliding segments 48 relative to the cross member of the seat member side fitting segment 20a. At the opposite ends of the sliding segments mushroom-like widening are provided, the upper sides of the force introduction surfaces 46 represent. These are subjected to force from below by means of two spring means 44 in the manner of coil springs. These spring devices 44 are supported with their downwardly facing end on the cross member of the fitting segment 22a. As a result, unless further force is applied to the force introduction surfaces 44, the switch carrier 42 is pressed permanently upwards.

In the state of Fig. 3a and 3b However, there is a force application to the force introduction surfaces 46 in a manner not shown. This will be referred to Fig. 2b caused by sections on the fitting segment 24, in this case by boom 28 on a cross-beam 26 of the fitting portion 24. The springs 44 are thus in the state of Fig. 3a and 3b held in the compressed state. The switch carrier 42 is characterized in a lower end position and an internally toothed outer profile 50a on the switch carrier 42 is consequently out of engagement with the externally toothed inner profile 50b. In the state of Fig. 3a and 3b the blocking device 40 is thus not active. The seat unit 10 can be rotated relative to the base 20.

If the application of force to the force introduction surfaces 46 is omitted, then the condition of the Fig. 4a and 4b one. By eliminating the application of force, the force introduction surfaces 46 are pressed by the spring means 44 upwards and thus also pull the switch carrier 42 upwards. Its internal toothed profile 50a thereby comes into engagement with the base-side profile 50b, which is not moved along in the vertical direction. Due to the large number of teeth of about 60 teeth, this engagement position can be achieved with minimal change in the relative rotational position of the seat unit 10 relative to the base 20 at most. In order to facilitate the production of the engaged state, the teeth can be provided in each case or one of the teeth with teeth, which have bevels.

The elimination of the application of force to the force introduction surfaces 46 is caused by the fact that the previously acting on sections on the arms 28 in the Fig. 2b well removable manner in the wake of activation of the stand-up function have been raised. The blocking thus necessarily results from the activation of the stand-up assistance function.

The most essential in the invention context components of the pivot bearing 30 and in particular the blocking device 40 are in an exploded view in Fig. 5 shown again.

Claims (8)

1. Piece of seating furniture comprising:

   a base (20); and

   a seating unit (10);

   wherein

   - between the base and the seating unit a rotary bearing (30) comprising a base-side bearing device (34) and a seating-unit-side bearing device (32) is provided, by means of which the seating unit (10) is rotatable about a vertical axis (2) relative to the base (20);

   - the rotary bearing (30) has a switchable blocking device (40) by means of which rotatability of the bearing devices (32, 34) with respect to one another is blockable;

   - the blocking device (40) is configured for form-fitting coupling of the bearing devices and for this purpose has two profiles (50a, 50b) comprising an inner profile (50b), which is attached to one of the bearing devices (32, 34) in a rotationally fixed manner, and an outer profile (50a) which is attached to the other one of the bearing devices (32, 34) in a rotationally fixed manner; and

   - the outer profile (50a) and the inner profile (50b) are displaceable with respect to one another in a direction of the vertical axis such that they are axially movable between an engaging relative position rotationally coupled in a form-fitting manner and a releasing relative position;

   characterized in that

   the piece of seating furniture has a stand-assistance function by way of which a seating surface (12) can be raised, wherein the blocking device (40) is operatively coupled to the stand-up assistance function such that when the stand-up assistance function is actuated, the blocking device takes up its blocked state.
2. Piece of seating furniture according to claim 1,
   characterized in that
   one of the profiles (50a) is provided on a switching carrier (42) that is rotationally fixed relative to the seating unit (10) or to the base (20), said switching carrier being displaceable in a manner guided in the direction of the vertical axis (2) with respect to the seating unit (10) or the base (20), respectively.
3. Piece of seating furniture according to claim 2,
   characterized in that

   - a spring device (44) is provided, by means of which the switching carrier (42) is subjected to a force in a direction of a first end position; and

   - a force-introduction surface (46) is provided on the switching carrier (42) or a part connected thereto, by means of which the switching carrier (42) is able to be subjected to a force counter to the force of the spring device (44) in a direction of a second end position.
4. Piece of seating furniture according to any one of claims 1 to 3,
   characterized in that
   the outer profile (50a) and the inner profile (50b) can be brought from the axial releasing relative position into the axial engaging relative position in a plurality of relative rotary positions, wherein for this purpose preferably the outer profile (50a) is configured as an internally toothed outer profile and the inner profile (50b) is configured as an externally toothed inner profile.
5. Piece of seating furniture according to any one of the preceding claims,
   characterized in that
   the blocking device (40) is operatively coupled to the stand-up assistance function such that when the stand-up assistance function is actuated, the blocking device takes up its blocked state by means of bringing about or dispensing with an application of force to the force-introduction surface (46) by activation of the stand-up assistance function.
6. Piece of seating furniture according to any one of the preceding claims,
   characterized in that
   the piece of seating furniture has an operating lever for manual actuation, the blocking device being switchable by means of said operating lever, in particular by an axial displacement of the switching carrier.
7. Piece of seating furniture according to any one of the preceding claims,
   characterized in that

   - the outer profile (50a) is provided in a rotationally fixed manner relative to the seating-unit-side bearing device (32), wherein in particular the switching carrier (42) is provided in a rotationally fixed manner relative to the seating-unit-side bearing device (32); and

   - the inner profile (50b) is provided in a rotationally fixed manner relative to the base-side bearing device (34).
8. Fitting for a piece of seating furniture, comprising:

   - a base portion for attaching to a base of the piece of seating furniture; and
   a seat portion for attaching to a seating unit of the piece of seating furniture;
   wherein

   - between the base portion and the seat portion provision a rotary bearing comprising a base-side bearing device (34) and a seating-unit-side bearing device (32) is provided, by means of which the seat portion is rotatable about a vertical axis (2) with respect to the base portion;

   - the rotary bearing (30) is provided with a switchable blocking device (40) by means of which rotatability of the bearing devices (32, 34) with respect to one another is blockable;

   - the blocking device (40) is configured for form-fitting coupling of the bearing devices (32, 34) and for this purpose has two profiles (50a, 50b) comprising an inner profile (50b), which is attached to one of the bearing devices (32, 34) in a rotationally fixed manner, and an outer profile (50a) which is attached to the other one of the bearing devices (32, 34) in a rotationally fixed manner; and

   - the outer profile (50a) and the inner profile (50b) are displaceable with respect to one another in a direction of the vertical axis such that they are axially movable between a rotationally coupled engaging relative position and a releasing relative position,

   characterized in that
   the piece of seating furniture has a stand-up assistance function, wherein the blocking device (40) is operatively coupled to the stand-up assistance function such that when the stand-up assistance function is actuated, the blocking device takes up its blocked state.

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