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US 4,509,865 AGranted
Electromagnetically-induced rocking clock
OwnerKuo-Chin Chuinventor
Life of this patent
Estimating the term…
Abstract
An electromagnetically-induced rocking clock includes a pendulum-adjustment means having an adjustable weight pivotedly formed on a casing movably fixed on a pendulum so that the weight can be moved either rightward or leftward and the casing can be vertically moved up and down to adjust the gravity center of the pendulum to obtain the selective swinging angle, speed or amplitude of the pendulum.
Claims2
An electromagnetically-induced rocking clock having a pendulum-adjustment means which comprises:
- a casing adjustably fixed on said pendulum and being formed with an arcuated hole thereon;
- an adjustable weight pivotedly fixed on said casing;
- a transversely adjusting screw passing through said arcuated hole formed on said casing and being fastened by nut 31 to definitely fix said weight on a specific point on said casing so that said screw and said weight can be moved either rightward or leftward to obtain a sharply vertical pendulum;
- and
- two longitudinally adjusting screws, formed on said casing, each adjusting screw being formed with an extension engaged with a vertical lengthy groove formed on said pendulum so that said casing may be vertically adjustably fixed on said pendulum by fixing a nut on each said longitudinally adjusting screw so as to adjust the gravity center and the arm of force of said pendulum.
2 more elements
An electromagnetically-induced rocking clock having an impact-prevention means which comprises:
- a pair of permanent magnets formed on the inner perimeter of outer swinging casing and a pair of permanent magnets corresponding formed on the outer perimeter of inner clock, each permanent magnet formed on inner clock being located approaching to utmost swinging point of each said permanent magnet formed on outer swinging casing and the magnetic pole of said magnet formed on the inner clock being the same as that of said magnet formed on the outer casing for producing repulsive force whenever facing each other so as to prevent collision therebetween.
Dependencies are inferred from the claim text.