Locking device for a roller blind

Locking device for a pre-tensioning arrangement of a roller blind or a Venetian blind, comprising a sleeve and a plug element adapted to be inserted into the sleeve, a locking member and a pin, wherein

• the sleeve on its inner circumferential surface comprises at least one recess;
• the plug element comprises a wall having a longitudinal and circumferential extension, and the wall defining a cavity adapted to receive the pin, and wherein the wall comprises a through-going opening, the opening being adapted to receive the locking member;
• the pin along its longitudinal extension comprises a locking portion and a releasing portion, and wherein the pin is movable inside and along the longitudinal extension of the cavity of the plug element between a locking position and a releasing position;
• in which locking position the locking portion of the pin longitudinally coincides with the through-going opening of the wall, whereby the locking member will engage the locking portion and be urged by the locking portion radially outwardly into the recess of the sleeve thereby preventing the plug element from being rotated in view of the sleeve, and
• in which releasing position the releasing portion of the pin longitudinally coincides with the through-going opening of the wall, whereby the locking member will engage the releasing portion of the pin and be allowed to move radially inwardly out of the recess of the sleeve, thereby allowing the plug element to be rotated in view of the sleeve.