Chairs and seats – Armrest – Adjustable to multiple use positions relative to bottom or back
Patent
1996-01-16
1996-11-05
Cranmer, Laurie K.
Chairs and seats
Armrest
Adjustable to multiple use positions relative to bottom or back
29741137, 29741136, 2481183, 24828931, A47C 754
Patent
active
055712746
DESCRIPTION:
BRIEF SUMMARY
This invention relates to an armrest device for a chair, especially an office chair, the device comprising a fastening element adapted to be fixed to the chair beside the seat thereof, as well as an armrest connected to the fastening element.
In a prior-art armrest device of this type, the armrest has a horizontal rear supporting bar, which is so connected to the fastening element as to be pivotable about a vertical axis, and a horizontal front supporting bar, which is movably connected to the rear supporting bar and carries a forearm rest, on which the user's forearm is to rest. The rear end of the front supporting bar is articulated to the front end of the rear supporting bar, so that the two supporting bars are pivotable in relation to one another about a vertical axis. The forearm rest, which is provided at the front end of the front supporting bar, is tiltable about an axis that extends transversely of the front supporting bar and pivotable about a vertical axis. One armrest device is to be mounted on each side of the chair.
This known armrest device has been developed for the specific purpose of eliminating the shoulder and back-of-the-head strains from which office employees spending most of their time in front of a typewriter, a word processor, a computer or the like often suffer and which, in many cases, cause severe pain. Although the known armrest device has proved successful in this respect, it is a somewhat complicated, and hence expensive, device. Furthermore, this device is disadvantageous by requiring a considerable operating space on the side of the chair where The armrest device is mounted.
There is, however, a simple and inexpensive armrest device which does not suffer from this drawback. Like The armrest device described in the foregoing, this other device comprises an armrest that has a horizontal rear supporting bar, which is so connected to the fastening element as to be rotatable about a vertical axis, and a horizontal front supporting bar, which is movably connected to the rear supporting bar and carries a forearm rest, on which the user's forearm is to rest. The two supporting bars are telescopically displaceable in relation to one another in order to form an armrest that can be lengthened and shortened as desired, for which reason this armrest device requires less space.
The object of the present invention is to improve the last-mentioned armrest device, such that it can be adjusted to meet the needs of different users, thus offering each particular user optimum working conditions in respect of strain.
According to the invention, this object is achieved by an armrest device for a chair, especially an office chair, said device comprising a fastening element, which is adapted to be fixed to the chair beside the seat thereof, and an armrest, which is connected to the fastening element and has a substantially vertical column so connected to the fastening element as to be rotatable about its longitudinal axis, a substantially horizontal rear supporting bar connected to the column, and a front supporting bar carrying a forearm rest, on which the user's forearm is to rest, and being telescopically displaceable in relation to the rear supporting bar in order to form an armrest that can be lengthened and shortened as desired, said device being characterised in that the rear supporting bar is so mounted on the column as to be pivotable about a substantially horizontal transverse axis, and that a spring means is adapted to maintain the rear supporting bar in an initial position as regards its pivotal movement about the horizontal transverse axis and to counteract, with an adjustable spring pressure, pivotal movement of the rear supporting bar from this initial position caused by a depression of the forearm rest, said spring means comprising a threaded rod which is articulated to the rear supporting bar and extends through a part fixedly connected to the column, a spring arranged on the rod between said part and an adjusting nut screwed on the rod for adjusting the pressure exerted by the sp
REFERENCES:
patent: 3929309 (1975-12-01), De Vore
patent: 5029941 (1991-07-01), Twisselmann
patent: 5143422 (1992-09-01), Althofer et al.
patent: 5407249 (1995-04-01), Bonutti
Cranmer Laurie K.
Ergonomiprodukter I Bodafors AB
LandOfFree
Arm-rest device for a chair does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Arm-rest device for a chair, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Arm-rest device for a chair will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2011554