Webbing take-up device
AssigneeKabushiki Kaisha Tokai Rika Denki Seisakusho
InventorsKazuhiro Yamada, Akira Sumiyashiki
Life of this patent
Estimating the term…
Abstract
In a webbing take-up device, a cut-out portion is formed in a close-off portion that closes off a pawl housing groove from a side opposite a spool body side. For this reason, the close-off portion is not formed in a position facing ratchet teeth which is at from a second ratchet tooth from a take-up direction side to the other side. Due to this, even if a head portion of a lock pawl, particularly a take-up direction side portion of the head portion, is displaced in such a way as to move away from the spool body, the head portion does not come into contact with the close-off portion or, even if the head portion comes into contact with the close-off portion, a force with which the head portion presses the close-off portion becomes smaller.
Claims5
A webbing take-up device, comprising:
- a frame at which is formed a ratchet hole having inner ratchet teeth;
- a spool that has a spool body that takes up a webbing by rotating in a take-up direction;
- a lock pawl that is provided at a lateral side of the spool body in an axial direction of the spool and that has a head portion at which are formed a plurality of outer ratchet teeth corresponding to the ratchet teeth of the ratchet hole and a tail portion that extends from a pull-out direction side of the head portion;
- a lock base that is formed at the spool at the lateral side of the spool body in the axial direction and at which is formed a pawl housing groove that houses the lock pawl inside the pawl housing groove and opens at a head portion side at an outer peripheral portion of the lock base;
- a sensor mechanism that, by being actuated, causes the lock pawl to move in a lock direction so that the ratchet teeth of the head portion mesh with the ratchet teeth of the ratchet hole to thereby regulate rotation of the spool in the pull-out direction;
- and
- a close-off portion that closes off the pawl housing groove from a side of the lock base opposite to the spool body side,
- an abut surface that is set at an inside surface of the pawl housing groove that abuts a portion of a side surface of the lock pawl, which portion is further than a middle portion in the axial direction toward the spool body side, in a state in which the ratchet teeth of the lock pawl are meshed with the ratchet teeth of the ratchet hole, that imparts a rotational force of the spool in the pull-out direction to the lock pawl, and that receives a reaction force corresponding to the rotational force;
- and
- a recessed portion that is formed between the abut surface and the close-off portion and that is formed in a recessed shape that opens inward in an open width direction of the pawl housing groove, the recessed portion having a curved surface that is curved so as to open inward in the open width direction of the pawl housing groove.
Dependencies are inferred from the claim text.