Optical: systems and elements – Projection screen – Roll up screen
Patent
1996-12-24
1998-08-25
Malley, Daniel P.
Optical: systems and elements
Projection screen
Roll up screen
359443, G03B 2156
Patent
active
057988617
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to an information presentation device of the type comprising a sheet of material rolled onto a drum mounted on a base and a demountable pole intended to be raised up from this base for holding the sheet taut between the drum and a point on the pole at a distance from the base, such as its upper end.
The term sheet of material rolled on a drum is intended to designate both an information medium and a screen which allows writing.
The term demountable pole designates both a pole constituted by telescopic elements and a pole constituted by elements which can be assembled end to end.
SUMMARY OF THE INVENTION
A presentation device of this type is intended to be transported from one information presentation site to another.
Apart from the fact that it must be light and sturdy, that is, able to withstand the dangers of transport such as shock or being disassembled and reassembled repeatedly without breaking, a device of this type must also be practical, which means that its assembly and disassembly must constrain the operator to the smallest possible number of manipulations.
The object of the device of the invention is precisely to obtain a device which combines lightness and sturdiness, and is also practical.
To this end, the subject of the invention is an information presentation device of the type comprising a sheet of material rolled onto a drum supported at least indirectly by a base, and a demountable pole intended to be raised up from this base for holding the sheet taut between the drum and a point on the pole at a distance from the base, such as its upper end,
the drum being contained in a case, and on the one hand guided in rotation around its longitudinal axis relative to the base, and on the other hand elastically stressed by a means for this purpose, in a predetermined direction of rotation, so as to maintain the sheet in traction so that it can be rolled inside the case through a longitudinal slot which it passes through in order to be unrolled,
which sheet comprises, in addition to an edge called the lower edge which is secured at least indirectly to the drum, an opposite edge called the upper edge, along which extends a slender rigid piece like a rod which, being particularly rectilinear and having a predetermined cross-section, is intended to be connected to the pole at right angles, specifically at a point called the suspension point, so as to allow the sheet to be held taut between this point and the drum,
the pole itself being the demountable type, meaning that in the unassembled state, it comprises at least one element which has a length equal to a fraction of the height of the pole in the raised state,
this device being characterized in that: elements, which opening has a profile substantially greater than that of one pole element in a longitudinal plane, so as to allow the passage of such a pole element, and opening adjoins the slot for the passage of the sheet and that the slender rigid piece connected to the upper edge of this sheet, in the rolled position of the sheet, at least partially closes the opening of the housing means, thus preventing any unloading of the pole elements it contains.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention may be clearly understood with the aid of the description below, given as a non-limiting example, in reference to the appended drawings which represent:
FIGS. 1 through 3: views in perspective of a device in the process of being installed,
FIG. 4: a view in cross-section of a device according to the invention,
FIG. 5: a partially abbreviated view of a device according to the invention .
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
Refer now to the drawings, which show a device 1 for presenting information (not represented), of the type comprising a sheet 2 of material rolled onto a drum 3 supported at least indirectly by a base 4, and a demountable pole 5 intended to be raised up from this base 4 for holding the sheet 2 taut between the drum 3 and a point 5A on the p
REFERENCES:
patent: D366055 (1996-01-01), Matsunaga et al.
patent: 4169658 (1979-10-01), Brown
patent: 4416511 (1983-11-01), Weinberg
patent: 5274499 (1993-12-01), Shopp
patent: 5581401 (1996-12-01), Takamoto et al.
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