1993-12-09
1996-05-21
Trettel, Michael F.
Beds
Sofa bed
5 52, 5 532, 5 591, A47C 1704
Patent
active
055177069
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
This invention relates to a sofa-bed which can be changed between a bed-mode and a sofa-mode or used as a bed and a sofa.
DESCRIPTION OF THE PRIOR ART
Many types of sofa-bed have been sold.
In a typical sofa bed, its mattress is longitudinally divided into two half portions, and when the sofa bed is used as a sofa (sofa-mode), a back half portion of the mattress is raised to use as a backrest.
A well-known problem of said type of the sofa bed is so uncomfortable to sleep because when the users use it as the bed, the divided portion of the mattress causes a bump portion and it touches on the back of the users.
Further more although the softness (or the hardness) required for a sitting portion and the backrest portion are different in general, selection of the softness is impossible because said type of prior sofa bed needs same composing element to be used in both the sitting portion and the backrest.
Some sofa beds with a backrest only to use as a backrest are provided to resolve said problems (e.g. Japanese Utility Model Opening No.187654 of 1985, Japanese Utility Model Opening No.164010 of 1979 and Japanese Patent Opening No.109509 of 1990). In these sofa beds, their backrests are removed from their mattress portions to other portions when the backrests are not used.
The problems of these types of sofa bed are that their backrests are to be nuisances in not using them. The backrest of the sofa bed, for example, disclosed in Japanese Utility Model Opening No.187654 of 1985 is laid on the floor in front of the sofa bed when the sofa bed used as the bed, and so the backrest prevents the user from moving on the bed.
So the applicant disclosed the sofa-bed in Japanese Patent Opening No.359985 of 1992 which can be changed between a bed-mode and a sofa-mode or used both as a bed and a sofa. This sofa-bed has the excellent advantages that the sofa-bed is not only comfortable in using as a bed but also possible to locate its backrest on the position where the backrest is not to be an obstacle. But a mattress on a panel is partially covered with a part of each movable half backrest put away on both end boards in bed-mode, so the lying area is decreased by said covered portion and a large size mattress specially ordered is required to make up the decreased area.
Furthermore the applicant disclosed another sofa-bed in Japanese Patent Opening No.335647 of 1992 which can change its mode between a bed-mode and a sofa-mode. Also this sofa-bed has the excellent advantages that the sofa-bed is not only comfortable in using as a bed but also possible to locate its backrest on the position where the backrest is not to be an obstacle, but in using as a sofa there has been felt need for lying in relaxed posture like in couch.
Accordingly, it is an object of the present invention to provide a sofa-bed which is not only comfortable in using as a bed but also possible to locate its backrest on the position where the backrest is not to be an obstacle.
It is still more object of the present invention to provide a sofa-bed which uses its backrest usefully in a bed mode.
It is another object of the present invention to provide a sofa-bed which is able to have visual beauty obtained by using its backrest in a bed mode.
It is another object of the present invention to provide a sofa-bed which can easily change its mode between a bed mode and a sofa mode.
It is another object of the present invention to provide a sofa-bed which is changeable in its mode with ease between a bed mode and a sofa mode, and can be exactly adjusted in the angle of its backrest vertically or in the front and backward direction, and is protected from the break when excessive weight is loaded on the backrest.
It is another object of the present invention to provide a sofa-bed whose lying area is not decreased by put away the backrest when the backrest is not used and which keeps larger lying area.
It is another object of the present invention to provide a sofa-bed which is not only comfortable in using as a bed but also possible to lo
REFERENCES:
patent: 2610329 (1952-09-01), Strathaus
patent: 2645788 (1953-07-01), Knoll et al.
patent: 2679653 (1954-06-01), Blanke et al.
patent: 2710412 (1955-06-01), Bayer
patent: 2866496 (1958-12-01), Glass
patent: 3248742 (1966-05-01), Johnson
Kashima Hiroshi
Kashima Osamu
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