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A convertible device for seating has a back; a seat, wheels for rolling the device, walls forming a receptacle for storing goods under the seat, the seat being turnable between a sitting position in which it is located substantially horizontally and covers the receptacle from above so that a person

A convertible device for seating has a back; a seat, wheels for rolling the device, walls forming a receptacle for storing goods under the seat, the seat being turnable between a sitting position in which it is located substantially horizontally and covers the receptacle from above so that a person can sit on the seat, and a loading position in which the seat is turned and located substantially vertically at a distance from back so that goods can be loaded into the receptacle.

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1. A convertible device for seating comprising a back; a seat; wheel means for rolling; wall means for forming a receptacle for storing goods under said seat, said seat being turnable between a sitting position in which it is located substantially horizontally and covers said receptacle from above s

1. A convertible device for seating comprising a back; a seat; wheel means for rolling; wall means for forming a receptacle for storing goods under said seat, said seat being turnable between a sitting position in which it is located substantially horizontally and covers said receptacle from above so that a person can sit on said seat, and a loading position in which said seat is turned and located substantially vertically at a horizontal distance from said back so that said back and said vertically located seat in said loading position form two horizontally spaced vertical guides for guiding the goods during loading into said receptacle from above; and additional chair means including at least an additional back located laterally relative to said back, and an additional seat located laterally relative to said seat, said additional seat and said additional back being folded toward one another and jointly turnable to be located behind said back. 2. A convertible device for seating as defined in claim 1, wherein said seat is turnable about a substantially horizontal axis which is spaced from said back. 3. A convertible device for seating as defined in claim 1, wherein said wheel means include two wheels. 4. A convertible device for seating as defined in claim 1, wherein said wheel means include four wheels. 5. A convertible device for seating as defined in claim 1; and further comprising a table plate which is formed by displacing said back. 6. A convertible device for seating as defined in claim 1, wherein said back is formed of a material which is displaceable so that when said additional seat and additional back is placed behind the seat, said additional back and said additional seat at least do not increase significantly a thickness of a back area. 7. A convertible device for seating as defined in claim 1, wherein said additional chair means also includes leg means and armrest means formed so that said leg means, armrest means and said additional seat are foldable to be located inside said back. 8. A convertible device for seating as defined in claim 1; said additional chair means comprising two additional chairs each having an additional back, an additional seat, additional legs and additional armrests, said additional seat, additional legs and additional armrests of each of said additional chairs being foldable to be located inside said additional back of each of said additional chairs, and both said additional chairs being foldable to be located inside said back. 9. A convertible device for sitting as defined in claim 1, wherein said additional chair means is foldable so that when said additional chair means is folded it has a width which does not exceed beyond a pipe of said additional back. 10. A convertible device for sitting as defined in claim 9, wherein said additional chair means is turnable by 180° and introducible into a rear part of the device without increasing dimensions of the device. 11. A convertible device for seating comprising a back; a seat; wheel means for rolling; wall means for forming a receptacle for storing goods under said seat, said seat being turnable between a sitting position in which it is located substantially horizontally and covers said receptacle from above so that a person can sit on said seat, and a loading position in which said seat is turned and located sustantially vertically at a horizontal distance from said back so that said back and said vertically located seat in said loading position form two horizontally spaced vertical guides for guiding the goods during loading into said receptacle from above and an additional back located laterally relative to said back, and additional seat located laterally relative to said seat, said additional seat and said additional back being folded toward one another and jointly turnable to be located behind said back; and further comprising a further back located laterally of said back at an opposite side of said additional back, and a furth er seat located laterally of said seat and at opposite side of said additional seat, said further back and said further seat being foldable toward one another and turnable to be located behind said back; two pairs of armrests associated with said back, an additional armrest associated with said seat, an additional armrest associated with said additional seat, and a further armrest associated with said further seat, all said armrests being also foldable to be located behind said back; and means forming a bed-like support and including a plate placeable on said first mentioned seat, said additional seat and said further seat. 12. A convertible device for seating as defined in claim 11, wherein said plate is composed of several members which are foldable over one another. 13. A convertible device for seating as defined in claim 11; and further comprising armrests which are movable between a supporting position in which they support arms of a user sitting on said seat and a withdrawn position in which they are withdrawn so as to allow said plate to be placed on said seats. 14. A convertible device for sitting as defined in claim 11, wherein said additional seat and said further seat are foldable so that in a folded position said additional seat and further seat have a width which does not exceed beyond a pipe of said additional back and said further back correspondingly. 15. A convertible device for sitting as defined in claim 14, wherein said additional back with said additional seat and said further back with said further seat are turnable by 180° and introduced into a rear part of the device without increasing dimensions of the device.