Motor-vehicle headrest
A motor-vehicle headrest has a base fixable to a motor vehicle seat and a cushion support having a forwardly directed front face adapted to engage a head of a person in the seat. An upper link has a front end pivoted at an upper support axis on the support and a rear end pivoted at an upper base axis on the base, and a lower link having a front end pivoted at a lower support axis on the support offset downward from the upper support axis and a rear end pivoted at a lower base axis on the base offset downward from the upper base axis. The cushion is shiftable relative to the base between a rear position and a front position on pivoting of the links about the respective axes. A rigid brace is pivoted on the upper link between the upper axes and on the lower link between the lower axes.
1. A motor-vehicle headrest comprising:
a base fixable to a motor vehicle seat;
a cushion support adapted to carry a cushion having a forwardly directed front face adapted to engage a head of a person in the seat;
an upper link having a front end pivoted at an upper support axis on the cushion support and a rear end pivoted at an upper base axis on the base;
a lower link having a front end pivoted at a lower support axis on the cushion support offset downward from the upper support axis and a rear end pivoted at a lower base axis on the base offset downward from the upper base axis, the lower link forming with the base, cushion support, and upper link a parallelogrammatic linkage, the cushion support being shiftable relative to the base between a rear position and a front position on pivoting of the links about the respective axes; and
an upright plate on the base, extending vertically generally between the upper base axis and the lower base axis, and formed with a cutout through which the upper link can pivot.
2. The motor-vehicle headrest defined in claim 1 , further comprising:
a latch mechanism including a first latch member on one of the links and a second blocking element on the base formed with interengageable sawteeth for releasably holding the cushion support against movement relative to the base in at least one direction between the front position and the rear position such that on interengagement of the sawteeth the latch mechanism impedes movement of the cushion support only into the rear position.
3. The motor-vehicle headrest defined in claim 2 wherein the latch member is shiftable relative to the base between a blocking position engaging the one link and impeding rearward movement of the cushion support and a releasing position disengaged from the one link and not impeding rearward movement of the cushion support.
4. The motor-vehicle headrest defined in claim 3 wherein the one link is the upper link.
5. The motor-vehicle headrest defined in claim 4 wherein the latch member is a pawl pivotal on the lower base axis, the latch member and upper link being formed with interengaging sawteeth that, when engaged, block movement of the front link in a direction moving rearward.
6. The motor-vehicle headrest defined in claim 3 , further comprising
actuating means for shifting the latch member between the blocking position and the releasing position.
7. The motor-vehicle headrest defined in claim 6 wherein the actuating means includes an element coupled to the latch member for shifting the latch member between the blocking position and the releasing position.
8. The motor-vehicle headrest defined in claim 1 wherein the plate is of sheet metal.
9. The motor-vehicle headrest defined in claim 1 wherein there are two such upper links and the base is formed with a pair of axially spaced such cutouts through which the respective upper links can pivot.
10. The motor-vehicle headrest defined in claim 1 wherein the upper and lower links are made of plastic.