Autonomous pendulum mechanism for clockworks

For use with a clockwork of the type comprising a clockwork casing the front face of which has spindles thereon for the clock hands, a pendulum mechanism adapted to be attached as a completely assembled unit to said clockwork casing and operative independently of said clockwork, said pendulum mechanism comprising a generally vertical supporting plate adapted to be attached to said clockwork casing in overlying spaced relation to the front face of said casing, said supporting plate having a pivot bearing thereon which is located vertically above said spindles when said pendulum mechanism is attached to said clockwork casing, a pendulum arm having an upper end mounted for pivotal motion in said bearing, said arm depending vertically downward from said pivot bearing across the rear side of said supporting plate for swinging motion across the front face of said clockwork casing in the space between said supporting plate and the front face of said casing, said arm in the direction of its extension being of generally V-shape and comprising a first portion which extends across the front face of said clockwork casing downwardly from said pivot bearing at an angle to the line between said pivot bearing and said spindles into the region between said spindles and one side of the clockwork casing and a second portion which is angled in a direction opposite to that of said first portion and extends across the front face of said clockwork casing downwardly from said first portion, whereby the swinging motion of said first portion across the front face of said clockwork casing when said pendulum mechanism is attached to said clockwork casing occurs entirely in the said region between said spindles and said one side of said clockwork casing while the lower end of said second portion swings across the front face of said clockwork casing between points which are substantially equidistant from the opposite sides of said clockwork casing in the region below said spindles, and an electrical drive mechanism in said pendulum mechanism adjacent the lower end of said second portion for effecting swinging motion of said pendulum arm, said drive mechanism comprising a permanent magnet carried by one of said supporting plate and said second portion, and an electrically energizable coil carried by the other of said supporting plate and second portion.