Automotive seatbelt take-up device
AssigneesSuncall Corporation, Kabushiki Kaisha Tokai Rika Denki Seisakusho
InventorsSadaaki Mitsuo, Masahito Wakahara, Norikazu Akamatsu, Kazuhiro Osaki
Life of this patent
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Abstract
An automotive seatbelt take-up device has a primary spiral spring biasing a take-up shaft in a seatbelt take-up direction. A spring clutch transfers rotation of the take-up shaft in a seatbelt drawing-out direction to a ring. A secondary spiral spring is capable of generating rotational biasing force on the take-up shaft in a direction opposite that of the primary spiral spring. Thus, the present invention provides an automotive seatbelt take-up device that can reduce both the drawing-out force and the take-up force of a seatbelt when the seatbelt is being worn.
Claims8
An automotive seatbelt take-up device comprising:
- a take-up shaft;
- a primary spiral spring biasing said take-up shaft in a take-up direction;
- and
- a balance spring capable of generating a rotational bias force in a direction opposite that of said primary spiral spring.
An automotive seatbelt take-up device comprising:
- a take-up shaft operatively connected to a seatbelt take-up shaft;
- a primary spiral spring fixed to said take-up shaft, biasing said take-up shaft in a take-up direction;
- a spring clutch, including a ring and a clutch spring, fitted to the outside of said take-up shaft, transferring rotation of said take-up shaft in a seatbelt drawing-out direction to said ring;
- a balance spring capable of generating a rotational bias force in a direction opposite to that of said primary spiral spring, one end of said balance spring being fixed to said ring;
- a ratchet wheel fixed to another end of said balance spring;
- and
- restricting means capable of restricting said ratchet wheel, thereby preventing rotation in said seatbelt take-up direction.
Dependencies are inferred from the claim text.