Tensioner for applying tension to force transmitting member
AssigneeNHK Spring Co., Ltd.
InventorsKazuo Ishii, Shigemasa Takahashi, Tanehira Amano, Takao Kobayashi, Kenjiro Kawanabe
Life of this patent
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Abstract
A tensioner comprises shaft members that mate with each other by means of thread portions. A first shaft member is rotatable with respect to a casing and is restrained from moving in its axial direction. A second shaft member, which is restrained from rotating with respect to the casing, is movable in its axial direction. A torsion spring applies torque in a first direction to the first shaft member. A torque switching member, which can switch frictional torque in association with the rotation of the first shaft member, is provided between the first shaft member and the casing.
Claims9
A tensioner comprising:
- a first shaft member rotatably inserted in a casing so as to be restrained from axial movement and having a first thread portion;
- a second shaft member having a second thread portion mating with said first thread portion, axially movable with respect to said casing, and restrained from rotation;
- a torsion spring for generating torque capable of rotating said first shaft member;
- and
- torque switching means for changing the turning torque of said first shaft member in accordance with the rotational angle of said first shaft member.
Dependencies are inferred from the claim text.