Patent ID: 11898635
Assignee: DAIDO KOGYO CO., LTD.
Field: Mechanical elements (Mechanical engineering)
Classification: CPC F | IPC F

Claim 10:
11. The tensioner of claim 3, wherein:
the movable section is supported by the fixed section so as to be capable of sliding in a reciprocating direction orthogonal to a coil axis direction of the flat spiral spring;
the flat spiral spring is disposed adjacently with respect to the movable section in a spring-adjacency direction orthogonal to both the coil axis direction and the reciprocating direction, an outer-end portion of the flat spiral spring being anchored to the movable section, and an inner-end portion of the flat spiral spring being anchored to the fixed section;
taking a rotation direction in which the flat spiral spring is wound-up as a wind-up direction and a rotation direction in which the flat spiral spring unwinds as an unwind direction, the ring-shaped portion extends from the anchor portion in the wind-up direction; and
as viewed along the coil axis direction, the one-end portion of the ring-shaped portion is disposed in a range from a position at 0 degrees about a center of the ring-shaped portion to a position at 90 degrees in the unwind direction with respect to a virtual straight line extending in the spring-adjacency direction from the center of the ring-shaped portion toward the movable section.