Rotatable piece of seating furniture

Abstract

A piece of seating furniture having a base and a seating unit, and a rotary mounting arrangement including a base-side bearing device and a seating-unit-side bearing device via which the seating unit is rotatable with respect to the base, and the rotary mounting arrangement has a switchable blocking device for blocking the rotatability of the bearing devices. The blocking device has two profiles including an inner profile attached to one of the two bearing devices in a rotationally fixed manner, and an outer profile attached to the other of the two bearing devices in a rotationally fixed manner. The outer profile and the inner profile are displaceable with respect to one another such that they are axially movable between an engaging relative position rotationally coupled in a form-fitting manner and a releasing relative position.

Claims

1. Piece of seating furniture comprising: a base; and a seating unit; wherein between the base and the seating unit provision is made of a rotary mounting means comprising a base-side bearing device and a seating-unit-side bearing device by means of which the seating unit is rotatable about a vertical axis relative to the base; wherein the rotary mounting means has a switchable blocking device by means of which rotatability of the bearing devices with respect to one another is blockable; wherein the blocking device is configured for form-fitting coupling of the bearing devices and has two profiles comprising an inner profile which is attached to a first one of the bearing devices in a rotationally fixed manner and an outer profile which is attached to a second one of the bearing devices in a rotationally fixed manner; wherein the outer profile and the inner profile are displaceable with respect to one another in a direction of the vertical axis such that the outer profile and the inner profile are axially movable between an engaging relative position rotationally coupled in a form-fitting manner and a releasing relative position; and wherein the piece of seating furniture has a stand-assistance function by way of which a seating surface can be raised, wherein the blocking device is operatively coupled to the stand-up assistance function such that when the stand-up assistance function is actuated, the blocking device takes up a blocked state in that application of force to a force-introduction surface is brought about or dispensed with by activation of the stand-up assistance function.

2. Piece of seating furniture according to claim 1, wherein: one of the profiles is provided on a switching carrier that is rotationally fixed relative to the seating unit or to the base, said switching carrier being displaceable in a manner guided in the direction of the vertical axis with respect to the seating unit or the base, respectively.

3. Piece of seating furniture according to claim 2, further comprising: a spring device which is configured to permanently subject the switching carrier to a force in a direction of a first end position; wherein the force-introduction surface is on the switching carrier or a part connected thereto, the switching carrier being able to be subjected to a force counter to the force of the spring device in a direction of a second end position by means of said force-introduction surface.

4. Piece of seating furniture according to claim 2, wherein: the piece of seating furniture has an operating lever for manual actuation, the blocking device being switchable by means of said operating lever by axial displacement of the switching carrier.

5. Piece of seating furniture according to claim 2, wherein: the outer profile is provided in a rotationally fixed manner relative to the seating-unit-side bearing device, wherein the switching carrier is provided in a rotationally fixed manner relative to the seating-unit-side bearing device; and the inner profile is provided in a rotationally fixed manner relative to the base-side bearing device.

6. Piece of seating furniture according to claim 1, wherein: the outer profile and the inner profile can be brought from the releasing relative position into the engaging relative position in a plurality of relative rotary positions, wherein the outer profile is configured as an internally toothed outer profile and the inner profile is configured as an externally toothed inner profile.

7. 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 is a rotary mounting means comprising a base-side bearing device and a seating-unit-side bearing device by means of which the seat portion is rotatable about a vertical axis with respect to the base portion; wherein the rotary mounting means is provided with a switchable blocking device by means of which rotatability of the bearing devices with respect to one another is blockable; wherein the blocking device is configured for form-fitting coupling of the bearing devices and has two profiles comprising an inner profile which is attached to a first one of the bearing devices in a rotationally fixed manner and an outer profile which is attached to a second one of the bearing devices in a rotationally fixed manner; wherein the outer profile and the inner profile are displaceable with respect to one another in a direction of the vertical axis such that the outer profile and the inner profile are axially movable between a rotationally coupled engaging relative position and a releasing relative position; and wherein the piece of seating furniture has a stand-up assistance function by way of which a seating surface can be raised, wherein the blocking device is operatively coupled to the stand-up assistance function such that when the stand-up assistance function is actuated, the blocking device takes up a blocked state in that application of force to a force-introduction surface is brought about or dispensed with by activation of the stand-up assistance function.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) Further aspects and advantages of the invention can be gathered from the claims and the following description of a preferred exemplary embodiment of the invention, said exemplary embodiment being explained with reference to the figures, in which:

(2) FIGS. 1a and 1b show a perspective view and a side view of a piece of seating furniture according to the invention in a use state,

(3) FIGS. 2a and 2b show a perspective view and a side view of the piece of seating furniture from FIGS. 1a and 1b in a raised state for easier standing up,

(4) FIGS. 3a and 3b show the rotary mounting means of the piece of seating furniture together with the blocking device in the use state,

(5) FIGS. 4a and 4b show the rotary mounting means of the piece of seating furniture together with the blocking device in the raised state of the piece of seating furniture, and

(6) FIG. 5 shows an exploded illustration of the rotary mounting means together with the blocking device.

DETAILED DESCRIPTION OF THE EXEMPLARY EMBODIMENTS

(7) FIG. 1a shows a piece of seating furniture according to the invention, wherein components that are subordinate in connection with the present invention are indicated merely by way of dashed lines.

(8) The piece of seating furniture has a base 20 for the purpose of positioning the piece of seating furniture. It also has a seating unit 10, which is arranged above the base 20 and provides a seating surface 12. The seating unit 10 is rotatable about a rotation axis 2 with respect to the base. To this end, it has a rotary mounting means 30 having a seat-side bearing device 32 and a base-side bearing device 34. Assigned to the rotary mounting means 30 is a blocking device 40, by way of which the rotatability of the seating unit 10 with respect to the base 20 can be prevented, as is explained further below.

(9) The particularity of the exemplary embodiment is in particular that the piece of seating furniture has a stand-up assistance function. This is explained by way of FIG. 2a. Provided on a lower fitting portion 20a, which also comprises the seating-unit-side bearing device 32, as will be described further below, are two links 22a, 22b which connect the segment 20a to a segment 24 on which the seating surface 12 is provided. By way of an electric motor, it is possible to introduce force into these links 22a, 22b, with the result that these are subjected to force such that the segment 24 together with the seating surface 12 is raised. This makes it easier for a person sitting on the piece of seating furniture to stand up.

(10) In particular in connection with such a functionality, the presence of the blocking device 40 is expedient, since, during standing up, i.e. in the state in FIGS. 2a and 2b, rotatability of the seating unit 10 about the axis 2 with respect to the base 20 is not desired.

(11) FIGS. 3a, 3b, 4a and 4b show how the blocking device 40 is configured and is operatively coupled to the stand-up assistance illustrated in FIGS. 2a and 2b.

(12) FIG. 3a shows a front view of the rotary mounting means 30 and the blocking device 40. FIG. 3b shows the components in a perspective view obliquely from below.

(13) Located on the seating-unit 12 side is said fitting element 20a, which has a cross member that connects two side plates, said cross member at the same time forming the seating-unit-side bearing device 32. Provided on the base 20 side, in a manner corresponding hereto, is the base-side bearing device 34 of the rotary mounting means 30.

(14) Furthermore, provided on the base 20 side is an externally toothed profile portion 50b, which is connected in a rotationally fixed manner to the base 20 and is thus not rotatable with respect to the latter. The column-like portion of the base 20, on which this toothing profile 50b is provided, is surrounded by a switching carrier 42. This switching carrier 42 is guided by means of two sliding segments 48 with respect to the cross member of the seating-element-side fitting segment 20a. Provided at the opposite ends of the sliding segments are approximately mushroom-like widenings, the top sides of which represent the force-introduction surfaces 46. These are subjected to a force from below by means of two spring devices 44 in the manner of helical springs. These spring devices 44 are supported by way of their downwardly directed ends on the cross member of the fitting segment 22a. As a result, as long as there is no further application of force at the force-introduction surfaces 44, the switching carrier 42 is pushed permanently upwards.

(15) However, in the state in FIGS. 3a and 3b, there is application of force at the force-introduction surfaces 46 in a manner which is not illustrated. This is caused, with reference to FIG. 2b, by portions on the fitting segment 24, in the present case by extensions 28 on a crossbar 26 of the fitting portion 24. The springs 44 are thus held in the compressed state in the state in FIGS. 3a and 3b. The switching carrier 42 is, as a result, in a bottom end position and an internally toothed outer profile 50a on the switching carrier 42 is consequently disengaged from the externally toothed inner profile 50b. Thus, in the state in FIGS. 3a and 3b, the blocking device 40 is not active. The seating unit 10 can be rotated with respect to the base 20.

(16) If the application of force at the force-introduction surfaces 46 is dispensed with, the state in FIGS. 4a and 4b is established. As a result of the discontinuation of the application of force, the force-introduction surfaces 46 are pushed upwards by the spring devices 44 and thus also pull the switching carrier 42 upwards. As a result, the internally toothed profile 50a of the latter comes into engagement with the base-side profile 50b that is not carried along in the vertical direction. On account of the large number of teeth, of which there are about 60, this engaging position can be achieved with at most minimal change in the relative rotary position of the seating unit 10 with respect to the base 20. In order to make it easier to establish the engaging state, each of the toothings or one of the toothings can be provided with teeth which have lead-in chamfers.

(17) The discontinuation of the application of force at the force-introduction surfaces 46 is brought about by the portions, previously acting thereon, on the extensions 28 being raised during the activation of the stand-up assistance function, in a manner that can be readily seen from FIG. 2b. Blocking thus arises inevitably from the activation of the stand-up assistance function.

(18) The most essential components, in the context of the invention, of the rotary mounting means 30 and in particular of the blocking device 40 are illustrated once again in an exploded illustration in FIG. 5.