Angle of rotation sensor, a linear displacement sensor, a door mount mechanism, and an electrical brush

A door mount mechanism for a smart lock system, said door mount mechanism being adapted to be mounted onto a door for rotating a thumb turn of a door lock which is mounted on the door, said door mount mechanism comprising:

• a casing having a door-mounting end that is adapted for abutting against the door, and defining a receiving space that is adapted for receiving the door lock, and that has an opening at said door-mounting end and adapted for extension of the door lock therethrough;
• a rotatable component coupled rotatably to said casing;
• an intermediate coupling connected co-rotatably to said rotatable component and adapted for driving rotation of the thumb turn of the door lock such that the thumb turn is co-rotatable with said rotatable component;
• and
• an angle of rotation sensor for measuring an angle of rotation of said rotatable component, the angle of rotation sensor including an electrically conductive band disposed onto said rotatable component for surrounding said rotatable component, and having two terminal ends which are spaced apart from each other and which are constantly and respectively applied with different voltages when said electrically conductive band rotates along with said rotatable component;
• two electrically conductive loops which are disposed onto said rotatable component for encircling said rotatable component, which are arranged in a manner that said electrically conductive band is sandwiched between said two electrically conductive loops, and which are connected electrically and respectively to said two terminal ends of said electrically conductive band;
• an electrical brush being in electrical contact with said electrically conductive band when said electrically conductive band rotates along with said rotatable component;
• and
• a voltage measuring device coupled to said electrical brush and measuring a divided voltage which is a voltage at a position of said electrically conductive band at which said electrical brush contacts, the angle of rotation of said rotatable component being associated with the divided voltage and the different voltages respectively applied to said two terminal ends of said electrically conductive band.