Locking device for furniture, rotatable furniture and method for locking a rotatable furniture

A rotatable furniture, comprising:

• a pedestal;
• a useful section, in particular a seat;
• and
• a locking device comprising:
• an axle which is rotatable for adjusting the furniture and which has an engagement recess limited to a predetermined angular segment about the axle;
• a blocking element which is configured for rotational blocking of the axle by engaging in the engagement recess;
• a support bearing which is configured to support the blocking element in a fixed rotational manner about the axle;
• and
• an adjusting ring rotating about the axle, which has a contoured recess for radial adjustment of the blocking element within the support bearing upon rotation of the adjusting ring about the axle, wherein the blocking element is engageable in the engagement recess by the radial adjustment, so that the axle is lockable rotationally with the support bearing by means of the blocking element,
• wherein the locking device couples the pedestal and the useful section by means of the axle and the support bearing of the locking device, and
• wherein the useful section is rotatable about the axle and lockable in a predetermined orientation relative to the pedestal by means of the locking device.