Chairs and seats – Headrest – Adjustable rectilinearly vertically
Patent
1997-09-30
1998-11-17
Nelson, Jr., Milton
Chairs and seats
Headrest
Adjustable rectilinearly vertically
297408, 297353, 2972841, A47C 736
Patent
active
058366512
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND
The invention relates to an adjustable cross-divided backrest for a vehicle seat.
German Patent No. 23704489 C1 describes a vehicle seat having a lower backrest cushion section which is swivel mounted on the seat cushion and which is adjoined by a height-adjustable upper backrest cushion section. In each edge area there is a toothed rod which meshes with a locally fixed gearwheel of a drive and is covered by a folding bellows.
This vehicle seat allows the height of the backrest to be adapted to the size of the user, but as the backrest height increases, so does the gap between the lower and upper backrest cushion sections. Support of the user's spinal column in this area is thereby lost.
Japanese Patent No. A 6-72200 describes a vehicle seat whose backrest consists of an outer frame-like part and an inner part connected to an adjustable seat cushion wherein this part is also connected to the outer frame-like part through longitudinal guides arranged at the sides. As the seat cushion is moved forwards, the inner backrest part is dragged along. At the same time, a transversely aligned gap is thereby formed in the backrest which leads to reduced support for the spinal column. At the top end of the outer frame-like backrest part there are guides for holding a separate head rest.
Japanese Patent No. B2 6-4044 discloses a three-membered backrest for a vehicle seat which consists of a lower backrest part mounted on the lower seat frame and an upper backrest part whose swivel axis is set in the upper area of the lower backrest part. The swivel axis of the head rest is in turn mounted in the upper area of the upper backrest part. Each of the three backrest parts can be adjusted independently of the others so that--within certain limits--the shape and position of the backrest can be designed in practically any form. Since however no height adjustment of the backrest or of the backrest parts is possible it is not possible to adapt to the different body sizes of the various users.
A vehicle seat for work vehicles is described in German Patent No. A1 38 24 730. It consists of a rigid frame on which the upholstered seat elements are mounted so that they can tilt but cannot be displaced. The backrest, which as a result of the rigid frame cannot be swivelled as a whole, consists substantially of two parts: an upper backrest part, and a lower lumbar support which is fixed on the frame in a rotary bearing on the seat cushion side and is supported with its free upper end on the upper backrest part. The padded elements of the upper backrest part are fixed on a U-rail which is divided into a double-armed lever by a bearing adjoining the frame at the back. With a downwardly directed swivel movement of the upper backrest part the lower lever arm of the U-rail presses against the supporting lumbar support so that it undergoes a forward displacement.
Apart from the fact that the backrest cannot be swivelled as a whole there is no height adjustment. For users whose back length does not agree ideally with the rigid swivel axis of the upper backrest part, the seat described can lead to an ergonomically incorrect posture of the user.
French Patent No. A1 2 561 182 describes a vehicle seat which has a three-part backrest whose parts are vertically adjustable overall and relative to each other. A lower backrest part represents the lumbar vertebra support, the middle backrest part the shoulder support, and the upper backrest part represents the head rest. Swivelling the three support parts relative to each other is not possible.
The vehicle seat described above can be adapted so an individual user to some extent, but no means are provided which would allow a change of angular position between the upper and middle backrest part. Thus adapting the support curve of the backrest to different or changing needs is not possible. This can lead to premature fatigue of the user.
U.S. Pat. No. 2,685,327 describes a two-part backrest for a vehicle seat with a lower backrest part which is swivel mounted on a lower seat frame and an upper
REFERENCES:
patent: 2685327 (1954-08-01), Pitman
patent: 4626028 (1986-12-01), Hatsutta et al.
patent: 5037158 (1991-08-01), Crawford
patent: 5058953 (1991-10-01), Takagi et al.
patent: 5222784 (1993-06-01), Hamelin
patent: 5370443 (1994-12-01), Maruyama
Pleiss Eberhard
Szerdahelyi Ferenc
Brose Fahrzeugteile GmbH & Co. KG Coburg
Jr. Milton Nelson
LandOfFree
Adjustable cross-divided backrest for vehicle seat does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Adjustable cross-divided backrest for vehicle seat, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Adjustable cross-divided backrest for vehicle seat will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-877697