Chairs and seats – Collapsible chair; i.e. – relatively folding bottom – back,... – Relatively collapsible bottom – front legs – and integral back...
Patent
1997-06-12
1998-07-21
Cranmer, Laurie K.
Chairs and seats
Collapsible chair; i.e., relatively folding bottom, back,...
Relatively collapsible bottom, front legs, and integral back...
297 58, 297 48, 297 50, A47C 400
Patent
active
057825289
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention regards a folding chair equipped with an improved opening and closing mechanism.
It is well known that all types of folding chairs on the present the same problems: in order to open or close them, the user is obliged to use both hands. One hand holds the chair, usually by the back, while the other rotates the seat up or down, according to whether the chair is to be opened or closed.
Moreover chairs on the market, in addition to requiring both hands to open or close, oblige the user to bend down. This can be bothersome, particularly for the elderly.
A drawback that current folding chairs present is the tendency to overturn or close when subjected to eccentric loading of the seat. It is well known that it is dangerous to stand on the seat of a chair of this kind.
A further disadvantage is formed by the fact that when a folding chair is set up on an uneven surface or when one of its legs rests on a higher point of an uneven floor, the user assumes an uncomfortable and unstable position.
The FR-A-1 238 791 document discloses a folding chair where the rear element of the frame consists of a tube "U" shaped. In the interior of each parallel part of said tube slides a stick in a telescopic manner, so the chair can be easily folded.
SUMMARY OF THE INVENTION
The aim of this invention is to overcome the above mentioned problems. One aim in particular is to realise a perfected folding chair which requires the use of only one hand to open and close.
Another aim is that closing and opening the chair comes about automatically when the chair is respectively lifted or put down.
A further aim is to create a chair with a seat which remains stable when loaded eccentrically, and which maintains its stability even when mounted on an uneven surface.
The above objectives are reached through the realisation of a folding chair, the main features of which are according to claim 1.
In a preferred embodiment of the invention, the elements which connect the struts and cross-bars, as well as the end-pins of the chair back together, are modular, being composed of pairs of identical symmetrical half-shells, through which the struts and cross-bars pass or terminate when the said half-shells are bolted together.
Advantageously, the chair of the invention results more manageable than other types of folding chair.
BRIEF DESCRIPTION OF THE DRAWINGS
Further scope of applicability of the present invention will become apparent from the detailed description given hereinafter. However, it should be understood that the detailed description and specific example, while indicating a preferred embodiment of the invention, are given by way of illustration only, since various changes and modifications within the spirit and scope of the invention will become apparent to those skilled in the art from this detailed description and from the drawings, wherein:
FIG. 1 The chair is shown in axonometric projection.
FIG. 2 There is an axonometric detail of the coupling which connects the seat of the invention to the rear cross-bar.
FIG. 3 Is an exploded view of the elements which connect the struts to the back of the chair.
FIG. 4 Is an axonometric projection of the elements shown in FIG. 3 when assembled.
FIG. 5 Is an exploded view of the elements which connect a strut of the chair to its relative cross-bar.
FIG. 6 Is an axonometric projection of the elements shown in FIG. 5 when assembled.
FIG. 7 Is a side projection of the seat in its open position.
FIG. 8 and 9 show the chair as it closes automatically when lifted.
FIG. 10 Shows the position that the chair assumes when opened on an uneven surface.
DESCRIPTION OF THE INVENTION
As can be seen in FIG.1, the folding chair of the invention is made up of a pair of front struts 2 and a pair of rear struts 3 serving as legs, which support the seat 5 and back 6 forming the chair. Of particular note, is that the back 6 is supported at its edges by connectors 7 which link it to the front and rear struts respectively 2 and 3 at their point of convergence, whereas the se
REFERENCES:
patent: 2757715 (1956-08-01), Hendrickson
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