Patent ID: 6505798
Filing Date: 2003-01-14
Classification: F16M

Abstract:
A drag mechanism for a tripod head, said drag mechanism comprising:a cylindrical portion arranged in the tripod head; a circular-plate holder disposed at an end of said cylindrical portion; a pair of arc lever tumblers rotatably supported on said circular-plate holder, said arc lever tumblers being engagable with an inner surface of said cylindrical portion, wherein each of said arc lever tumblers has a first end and a second end, and each of said arc lever tumblers is rotatable about a rotation axis located at its first end, and the first ends of said arc lever tumblers are located close to each other; a rotator rotatably supported on said circular-plate holder, said rotator having an arc gear portion, wherein said rotator is rotatable about a rotation axis located between the second ends of said arc lever tumblers; a first linking device connecting the second end of one of said arc lever tumblers to said rotator; a second linking device connecting the second end of the other of said arc lever tumblers to said rotator; and a torque-adjusting shaft extending through a central portion of said circular-plate holder, said torque-adjusting shaft having a gear portion engaging said arc gear portion of said rotator, wherein said torque-adjusting shaft can be rotated by rotational operation of an adjusting knob rotatably mounted on a surface of the tripod head.