in which a torsion spring rotates a member around an axis arranged in the direction of the axis of the piston

Full Title

Closers or openers with braking devices, e.g. checks; Construction of pneumatic or liquid braking devices (construction of non-pneumatic or non-liquid braking devices E05F5/00; friction devices in hinges E05D11/08) > with liquid piston brakes (rotary type E05F3/14) > in which a torsion spring rotates a member around an axis arranged in the direction of the axis of the piston