发明授权
US3702191A Ball and raceway amusement device 失效
球和休闲娱乐设备

Ball and raceway amusement device
摘要:
AN AMUSEMENT DEVICE CONSISTING OF A PAN-LIKE PADDLE, CONCAVE ON ONE FACE AND CONVEX ON THE OTHER, PROVIDED WITH AN INTEGRAL RADIALLY EXTENDING HANDLE, BOTH FACES HAVING FORMED THEREON AN INCLINED SPIRAL RACEWAY EXTENDING FROM A POINT AT THE OUTER PERIPHERY THEREOF NEAR THE HANDLE AND TERMINATING IN A BALL-RECEIVING DEPRESSION AT THE CENTER. A BALL OF MARBLE IS CAUSED TO MOVE UP OR DOWN THE RACEWAYS BY PROPERLY TILTING THE PADDLE, GREATER SKILL BEING REQUIRED TO KEEP THE BALL ON THE RACEWAY ON THE CONVEX SIDE THAN ON THE CONCAVE SIDE.
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