Torque limiting adjuster

A torque limiting adjuster for adjusting the position of an adjustable part of a lighting device, the torque limiting adjuster comprising

• a housing comprising a main opening and a first threaded portion;
• an output shaft partially housed inside the housing with a first end protruding from the main opening of the housing, the first end being engageable with the adjustable part;
• a driving gear;
• a driven gear comprising a gearing portion adapted to be engaged with the driving gear, the driven gear being configured to rotate until a predetermined limit position when being driven by the driving gear;
• a biasing element arranged to exert a biasing force onto the driving gear so as to engage the driving gear and the driven gear;
• wherein
• the output shaft further comprises a first linear guiding portion oriented in a main direction and a second threaded portion located between the first end of the output shaft and the first linear guiding portion and coupled with the first threaded portion of the housing;
• and
• the driven gear further comprises a second linear guiding portion slidably coupled with the first linear guiding portion, the second linear guiding portion being configured to transmit the rotation of the driven gear to the first linear guiding portion when the driven gear rotates driven by the driven gear;
• the coupling of the second threaded portion and the first threaded portion being configured to allow the output shaft to move linearly with respect to the housing when the output shaft rotates driven by the driven gear;
• the torque limiting adjuster being thereby configured to provide a linear movement of the output shaft with respect to the driven gear in the main direction when the driving gear is actuated;
• the torque limiting adjuster being arranged in such a way that when the driven gear is forced to rotate beyond the predetermined limit position, the driven gear exerts a reaction force on the driving gear that overcomes the biasing force.