G - Physics – 04 – B
Patent
G - Physics
04
B
G04B 15/00 (2006.01)
Patent
CA 2117832
The present invention relates to a paper clock comprising inter alia a frame structure, a pendulum and an escapement and impulse mechanism which are all made of thin cardboard. This mechanism is composed of two elongated gravity arms that hang pivotally from the frame structure and of two coaxial integrally linked, weight-driven tripodal escape wheels that are adapted to abut against fingers fixed to the gravity arms. The pendulum oscillates between and is in alternate engagement by the bottom ends of the gravity arms to pivot the same and free the escape wheels to effect stepwise rotating movement and drive the hour and minute hands through a fraction of a turn on the clock dial of the paper clock. One of the gravity arms acts as an impulse producer and comprises a sand-filled reservoir for greater inertia. This impulse arm is raised by a spoke of the rotating escape wheels and strikes the pendulum rod when both are in their downward trajectory to give the pendulum rod the momentum it has lost during the last complete oscillation. The whole clock is made of paper, except for the shaft spindles which are made of metal and the weights in the weight, pendulum and gravity arm which is sand.
Landry Andre
Lesperance & Martineau
LandOfFree
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