Chairs and seats – Movable bottom – Movable independently of back
Patent
1997-08-06
1999-07-13
Cranmer, Laurie K.
Chairs and seats
Movable bottom
Movable independently of back
29734419, 29734418, A47C 102
Patent
active
059216280
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to a rocking stool having a seat portion, an intermediate portion and a base portion, wherein the intermediate portion is mounted tiltably and returnably on the base portion.
BACKGROUND OF THE INVENTION
A rocking stool of that kind is known from German Utility Model No. 75 31 129. That however involves less a stool than a working seat for workers who are obliged to stand at the working station. That working seat has a saddle seat which is adjustable in respect of height and which follows any movement of the person using the seat. A ball joint disposed above a plate base permits the rocking movement and a tension spring mechanism which is integrated in the plate base provides for automatic return into the neutral position. Adjustment in respect of height of the seat and a limited springing effect are afforded by way of a gas pressure spring which is integrated in the intermediate portion.
That working seat or rocking stool suffers from the disadvantage that it is only limitedly sprung on the longitudinal axis of the intermediate portion, by way of the gas pressure spring, and thus a swing movement about the longitudinal axis of the intermediate portion is not possible.
SUMMARY OF THE INVENTION
The object of the invention is so to develop a rocking stool that it permits actively dynamic seating thereon, that is to say which in addition to the rocking movement permits a swinging movement while performing normal sitting activity on the longitudinal axis of the intermediate portion in the deflected condition.
According to the invention that object is attained in that the intermediate portion comprises a central pillar and a spring structure and the central pillar and the spring structure are connected in series in the flow of force of the seat weight between the seat portion and the base portion and a bearing guide is provided between the central pillar and the spring structure.
The fact that the intermediate portion is in the form of a central pillar and a spring structure and the compact arrangement of the central pillar and the spring structure, as well as the provision of the bearing guide for the relative movement which occurs here between the central pillar and the spring structure make it possible, with the overall dimensions of a stool, to provide a springing movement on the longitudinal axis of the intermediate portion, such movement ensuring a comfortable active-dynamic swinging motion, over a long spring travel, while sitting on the stool.
Advantageously the central pillar and the spring structure are arranged concentrically, wherein here the spring structure has a dynamic and a static spring mounting, between which a spring is disposed. The bearing guide is desirably arranged between the central pillar and the static spring mounting.
Advantageously the central pillar is in the form of a spring pillar which is adjustable in respect of its length, such as for example a gas spring, and has at least one vertical guide track which co-operates with the bearing guide.
The bearing guide desirably includes a two-part bearing means which is arranged at a spacing in respect of height, with balls or rollers preferably being used as bearing elements.
In a particularly preferred embodiment the bearing elements are pressed under a spring loading against the guide track. When using bearing elements which are not subjected to a spring force, manufacturing inaccuracies are very severely perceptible in the rocking and swinging movement, and have a highly disturbing and troubling effect in terms of active-dynamic seating on the stool.
It is desirable to arrange at least two bearing elements on the guide track, for each bearing means.
In that arrangement the bearing elements are advantageously held in bearing element mountings, wherein the bearing element mountings press the bearing elements against the guide track by way of compression springs, or by way of an elastically deformable region, or by way of an elastically deformable projection. The compression springs or
REFERENCES:
patent: 4932719 (1990-06-01), Gonzalez Y. Rojas
patent: 5556170 (1996-09-01), Lai et al.
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