Abstract: Provided is a calendar allowing a user to easily read the display for a particular day. A calendar 10 includes a day-display section displaying a day. The day-display section has a plurality of arc figures 28(1) to 28(5), each of which has an arc centered on a vertex of a polygon. The day is sequentially and continuously displayed along the plurality of arc figures.

Abstract: Provided is a chain-drive mechanism for bicycles having a simple configuration and low manufacturing, and capable of transmitting a driving force to a rear wheel when the crank arms rotate forward and reversely. The chain-drive mechanism for bicycle includes: an inner sprocket configured to integrally rotate with a crankshaft of a bicycle; and an outer sprocket disposed coaxially and in parallel with the inner sprocket to be rotatable relative to the crankshaft. An inner freewheel coaxially rotates with the rear wheel of the bicycle, and an outer freewheel is placed in parallel and coaxially with the inner freewheel. A chain runs on the inner sprocket, the outer sprocket, the inner freewheel and the outer freewheel so that the outer sprocket and the inner sprocket rotate in opposite directions and the outer freewheel and the inner freewheel rotate in opposite directions.

Abstract: Provided is a chain-drive mechanism for bicycles having a simple overall configuration and keeping the manufacturing cost down, and capable of transmitting a driving force to a rear wheel when the crank arms rotate forward as well as reversely. The chain-drive mechanism for bicycle includes: an inner sprocket 20 configured to integrally rotate with a crankshaft 12 of a bicycle; and an outer sprocket 24 disposed coaxially and in parallel with the inner sprocket 20 to be rotatable relative to the crankshaft 12. An inner freewheel 22 coaxially rotates with the rear wheel of the bicycle, and an outer freewheel 26 is placed in parallel and coaxially with the inner freewheel 22. A chain 28 runs on the inner sprocket 20, the outer sprocket 24, the inner freewheel 22 and the outer freewheel 26 so that the outer sprocket 24 and the inner sprocket 20 rotate in opposite directions and the outer freewheel 26 and the inner freewheel 22 rotate in opposite directions.

Abstract: The invention provides a simplified, light-weight, and an inexpensive suspension device which is capable of absorbing and mitigating shock and oscillation caused by projections and recesses on the road surface. To achieve the above object, the invention has embodied a suspension device 10 comprising the following: a main crank shaft 14 being rotatably supported by a shaft supporter 12 secured to a main body frame, a pair of crank arms 16 and 18 extending themselves substantially orthogonally from both ends of the main crank shaft 14 in the direction inverse from each other, and a pair of crank pins 24 and 26 being set projectively to edge portions of said crank arms 16 and 18 and housing wheels 20 and 22 by coupling therewith. Directions of a pair of crank arms 16 and 18 extending themselves in the inverse directions respectively form a predetermined angle by way of centering around the main crank shaft 14.