Chairs and seats – Bottom or back – Rigid or semirigid hollow shell
Patent
1997-01-03
1997-10-28
Brown, Peter R.
Chairs and seats
Bottom or back
Rigid or semirigid hollow shell
29745255, 403335, A47C 512
Patent
active
056810938
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a double shell supporting device of a plastic material for a back rest of a seat-group structure with an inner shell part adapted to be a, support of the back of a person sitting on the corresponding seat and an outer shell part destined to be a stiffening member.
Backrests of seat-group structures include generally a supporting device which can be designed as a plate or a frame. This plate or this frame, resp. can serve in case of simpler designs, e.g. garden chairs, for a direct contacting the back of the seated person, or can be, in case of e.g. upholstered chairs or seats of motor vehicles with a upholster, connected to a upholstering. The supporting device which can be made, as generally known, of metal or plastic material can include, furthermore, a cladding on the reverse side which may be merely a lacquer or also a decorative covering, for instance a textile product, or piece of a carpet, leather, etc. For back rest seats single-shell, ribbed supporting devices have become known which indeed may be manufactured at low costs, can, however, not meet the steadily increasing demands made for such group structures. Furthermore, shell parts made of two pressed parts of glass mat reinforced thermoplastic plastic material laminates welded afterwards together have become known as supporting structures. The two shell parts are, thereby, welded together along the edge areas which extend along both sides of the back rest and along its upper edge. While a supporting device which is formed of two shell parts which are welded together can absorb large forces without damage and in case of motor vehicles can also meet the higher demands in case of an accident, the production by means of a welding is costly and time consuming.
SUMMARY OF THE INVENTION
Object of the invention is to remedy the mentional drawbacks and to provide a double shell supporting device which is designed in a low cost manner and for a saving on assembly time.
The inventive double shell supporting device of the invention comprises plastic material for a backrest of a seat group structure with an inner shell part destined as a backrest for a person sitting on the corresponding seat, and an outer shell part acting as a stiffening member. The supporting device is further characterized in that the outer shell part is clampingly connected to the inner shell part by means of a form-locked snap-lock connection. The inner shell part includes a circumferential L-shaped portion which includes a first leg part and a second leg part. The outer shell part includes a circumferential L-shaped portion. In includes a third leg part and a fourth leg part. A first protrusion part projects from the first leg part. A second protrusion part projects from the second leg part. These two protrusion parts define a gap into which the fourth leg part of the L-shaped portion is set in a clamped manner. In order to assemble to snap-lock connection, the second leg part and the third leg art can be bent in a resilient manner. Thus, the fourth leg part is held form-locked in the L-shaped portion due to the elasticity of the glass-mat reinforced thermoplastic material laminate of which the inner shell part and the outer shell part are made. Therefore, no separation of the inner shell part can occur in case of an influence of forces. The assembling of the two shell arts is extremely simple, of low cost and needs little time.
BRIEF DESCRIPTION OF THE DRAWING
FIG. 1 depicts a horizontally extending section through the left portion of a backrest of a seat unit of the invention.
DETAILED DESCRIPTION
Hereinafter, the subject of the invention will be explained by example more in detail.
The single figure illustrates a horizontally extending section through the left portion of a back-rest of a seat group structure.
The back-rest of a seat group structure illustrated in the figure in a horizontal section includes an inner shell part 1 made of a glass-mat reinforced thermoplastic plastic material laminate (GMT). Accord
REFERENCES:
patent: 3482874 (1969-12-01), Henebry et al.
patent: 3992056 (1976-11-01), Koziatek et al.
patent: 4088367 (1978-05-01), Atkinson et al.
patent: 4813808 (1989-03-01), Gehrke
patent: 5013179 (1991-05-01), Rothmund
Brown Peter R.
Symalit AG
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