Headrest device
First Claim
1. A headrest device, comprising:
- a fixed base being supported by a seatback;
a movable base disposed at a forward position relative to the fixed base;
at least one first link being rotatably supported by a connecting shaft provided between the movable base and the fixed base, the first link having a first end connected to the movable base and a second end connected to the fixed base;
at least one second link being supported by the connecting shaft so as to rotate relative to the first link, the second link having a first end connected to the movable base and a second end connected to the fixed base;
a connection portion including the first link and the second link and connecting the movable base and the fixed base to be relatively movable by a relative rotation between the first link and the second link;
a drive portion relatively rotating the first link and the second link in a direction so as to deploy the movable base away from the fixed base on the basis of a detected result by a rear-end collision detection means which is connected to the connection portion to detect and/or predict a vehicle rear-end collision;
at least one relative rotation restricting portion provided at a portion of the fixed base and/or the movable base; and
a biasing portion for biasing the first link away from the at least one relative rotation restricting portion,the at least one relative rotation restricting portion restricting a relative rotation between the first link and the second link about the connecting shaft when a load larger than a biasing force of the biasing portion is applied to the movable base upon the vehicle rear-end collision and when subsequent rearward movement of the movable base establishes an engagement thereof with the first link,the at least one relative rotation restricting portion allowing the relative rotation between the first link and the second link about the connecting shaft when the load applied to the movable base is smaller than the biasing force of the biasing portion and when the resulting disengagement of the movable base from the first link is established.
1 Assignment
0 Petitions
Accused Products
Abstract
A headrest device includes a fixed base, a movable base disposed forward relative to the fixed base, at least one first link being rotatably supported by a connecting shaft provided between the movable base and the fixed base, at least one second link being supported by the connecting shaft so as to rotate relative to the first link, a connection portion connecting the movable base and the fixed base to be relatively movable by a relative rotation between the first link and the second link, a drive portion relatively rotating the first link and the second link in a direction so as to deploy the movable base away from the fixed base on the basis of a detected result by a rear-end collision detection means, and at least one relative rotation restricting portion provided for restricting a relative rotation between the first link and the second link about the connecting shaft.
64 Citations
16 Claims
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1. A headrest device, comprising:
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a fixed base being supported by a seatback; a movable base disposed at a forward position relative to the fixed base; at least one first link being rotatably supported by a connecting shaft provided between the movable base and the fixed base, the first link having a first end connected to the movable base and a second end connected to the fixed base; at least one second link being supported by the connecting shaft so as to rotate relative to the first link, the second link having a first end connected to the movable base and a second end connected to the fixed base; a connection portion including the first link and the second link and connecting the movable base and the fixed base to be relatively movable by a relative rotation between the first link and the second link; a drive portion relatively rotating the first link and the second link in a direction so as to deploy the movable base away from the fixed base on the basis of a detected result by a rear-end collision detection means which is connected to the connection portion to detect and/or predict a vehicle rear-end collision; at least one relative rotation restricting portion provided at a portion of the fixed base and/or the movable base; and a biasing portion for biasing the first link away from the at least one relative rotation restricting portion, the at least one relative rotation restricting portion restricting a relative rotation between the first link and the second link about the connecting shaft when a load larger than a biasing force of the biasing portion is applied to the movable base upon the vehicle rear-end collision and when subsequent rearward movement of the movable base establishes an engagement thereof with the first link, the at least one relative rotation restricting portion allowing the relative rotation between the first link and the second link about the connecting shaft when the load applied to the movable base is smaller than the biasing force of the biasing portion and when the resulting disengagement of the movable base from the first link is established. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A headrest device, comprising:
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a fixed base supported by a seatback; a movable base disposed at a forward position relative to the fixed base; at least one first link being rotatably supported by a connecting shaft provided between the movable base and the fixed base, the first link having a first end connected to the movable base and a second end connected to the fixed base; at least one second link supported by the connecting shaft to rotate relative to the first link, the second link having a first end connected to the movable base and a second end connected to the fixed base; the first link and the second link connecting the movable base and the fixed base to be relatively movable by relative rotation between the first link and the second link; rear-end collision detection means for detecting and/or predicting a vehicle rear-end collision; a drive portion operatively connected to the connecting shaft to relatively rotate the first link and the second link to move the movable base away from the fixed base based on a result detected by the rear-end collision detection means; a first engaging portion provided on the first link; a second engaging portion provided on the movable base, the second engaging portion being engageable with the first engaging portion to restrict relative rotation between the first and second links; a spring applying a biasing force to the first link biasing the first and second engaging portions away from one another; the engagement of the first and second engaging portions restricting the relative rotation between the first link and the second link about the connecting shaft when a load larger than the biasing force of the spring is applied to the movable base upon the vehicle rear-end collision and when subsequent rearward movement of the movable base establishes engagement of the first and second engaging portions; and the first and second engaging portions being disengaged to allow the relative rotation between the first link and the second link about the connecting shaft when the load applied to the movable base is smaller than the biasing force of the spring and when the resulting disengagement of the first and second engaging portions is established. - View Dependent Claims (14, 15, 16)
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Specification