Chairs and seats – Headrest – Adjustable rectilinearly vertically
Reexamination Certificate
1999-11-11
2001-04-17
Barfield, Anthony D. (Department: 3636)
Chairs and seats
Headrest
Adjustable rectilinearly vertically
C297S061000
Reexamination Certificate
active
06217117
ABSTRACT:
The invention concerns a coupling device for a telescopically adjustable object such as a head support or the like.
Head supports for example of vehicle seats are usually connected to the backrest of the vehicle seat, and are adjustable in respect of height, by means of a connecting element. Known head supports of that kind are normally adjustable in respect of height as desired in a heightwise range of the order of magnitude of between 60 and 100 mm. That is often not adequate in particular for very tall seat occupants.
The object of the present invention is to provide a coupling device of the kind set forth in the opening part of this specification, which permits increased telescopic displacement of the object.
In a coupling device of the kind set forth in the opening part of this specification, in accordance with the invention that object is attained in that the object has a first and a second body and that the coupling device is provided in such a way that the first body can move jointly with the second body along a first linear guide between a base position and a first extension position and from the first extension position the second body is only adjustable linearly in relation to the first body as far as a maximum position. In this case the coupling device according to the invention is of such a configuration that adjustment of the second body in relation to the first body from the first extension position is made possible automatically, that is to say without the actuation of a special actuating element, in order as desired to displace the second body to a maximum position. At the same time the first body is automatically retained in the first extension position.
In the case of the coupling device according to the invention the first linear guide can have at least one stationary first bar which at its distal end portion is provided with an opening defining the first extension position, and the first body can have a spring-loaded slider which forms the coupling device and which in the first extension position engages into the opening in the first bar. In this arrangement the first body can have at least one passage for linear guidance of an associated second bar of the second body and the second body can be provided at its distal end portion with an aperture for the slider. The said slider is therefore desirably provided transversely with respect to the first and the second bars and is displaceable in the first body transversely with respect to the first and the second bars in order to engage either into the opening at the distal end portion of the first bar or into the aperture at the distal end portion of the second bar.
The second bar can be provided at its distal end with an inclined surface and upon contraction of the object from the maximum position back into the first extension position the slider can be displaced with a contact portion against the inclined surface in such a way that the slider is released from the opening in the first bar and at the same time engages into the aperture in the second bar and connects the second body to the first body. That connection then therefore provides that, from the first extension position back to the base position, the second body is displaceable with the first body jointly back into the base position.
The coupling device according to the invention is of a simple configuration and has only a few individual parts, which is advantageous from assembly points of view.
REFERENCES:
patent: 3462193 (1969-08-01), Tamura
patent: 3813151 (1974-05-01), Cadiou
patent: 5110185 (1992-05-01), Schmutz
patent: 5836651 (1998-11-01), Szerdahelyi et al.
patent: 3039934 (1982-05-01), None
patent: 4219941 (1993-12-01), None
patent: 4306254 (1994-09-01), None
patent: 297 11 138 (1997-10-01), None
patent: 743224 (1996-11-01), None
Barfield Anthony D.
Grammer AG
Lillie Raymond J.
Olstein Elliot M.
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