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Adjustable headrest with safety lock

IP.com Disclosure Number: IPCOM000225187D
Publication Date: 2013-Jan-29
Document File: 8 page(s) / 903K

Publishing Venue

The IP.com Prior Art Database

Abstract

The present invention relates to adjustable head rest assemblies, i.e. head rest assemblies including a head rest that is displaceable in one or more directions relative to a back rest of a vehicle seat onto which the head rest is adapted to be attached. A problem present in this field is that an extreme acceleration of the vehicle, such as in a crash situation may come to displace the head rest, e.g., by releasing a locking mechanism utilized to retain the head rest in a certain position. The present invention sets out to address this problem.

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The present invention relates to adjustable head rest assemblies, i.e. head rest assemblies including a head rest that is displaceable in one or more directions relative to a back rest of a vehicle seat onto which the head rest is adapted to be attached.

A problem present in this field is that an extreme acceleration of the vehicle, such as in a crash situation may come to displace the head rest, e.g., by releasing a locking mechanism utilized to retain the head rest in a certain position. The present invention sets out to address this problem.

In a preferred embodiment, the adjustable head rest assembly is a so called foldable head rest assembly, where the head rest is orbitable relative to the back rest between at least a folded position and an in-use position. In the folded position, the head rest is placed in a position wherein it does not obscure the line of sight for the driver and/or facilitates folding of the vehicle seat, such that the seat can be stowed away to increase, the space available for, e.g. storage of luggage. In the in-use position, the head rest is in a position to support the head of an occupant of the seat. It is to be appreciated that the present invention has its application in any adjustable head rest assembly where an extreme acceleration may come to cause the head rest to be displaced.

The preferred embodiment comprises a bracket to be attached to the back rest, an armature pivotally mounted in the bracket, a head rest carried by the armature, a locking mechanism mounted in the bracket for releaseably locking the armature in a position corresponding to the in-use position of the head rest, the locking mechanism including a lock member spring biased into engagement with the armature for and a release mechanism for moving the locking member, mechanism and an actuator in the form of a Bowden-type cable for moving the release mechanism.

The bracket includes a front wall, a top wall, two side walls and a center wall presenting a stop surface. The function of this stop surface will be elaborated later. The side walls typically includes a first right side wall, a second right side wall spaced from the first right side wall, a first left side wall and a second left side wall spaced from the second left side wall. The bracket includes two sets of aligned apertures for pivotally receiving the armature and the locking mechanism, respectively. These apertures are formed in the side walls.

The armature includes two legs connected to each other at a first end by a cross rod. The head rest is attached to the legs approximate this first end and the cross rod is disposed in the head rest. On the second end of the two legs, each leg includes a slot which extends from the second end and a distance along the longitudinal axis of the leg. Metal plates are disposed in these slots and fixed to the legs by e.g. welding. The metal plates are both curved to form essentially the letter J.

The metal plates each include a hole th...