Card – picture – or sign exhibiting – Signs – With raising or lowering means
Reexamination Certificate
2001-09-28
2003-07-15
Green, Brian K. (Department: 3611)
Card, picture, or sign exhibiting
Signs
With raising or lowering means
C040S617000
Reexamination Certificate
active
06591528
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a suspension device for a sheet-shaped information medium, such as a poster or the like, for attachment to a wall or another surface, comprising an upper and a lower bar to which the information medium can be fastened, whereby the upper bar is connected to a cord system having pulleys, for raising and lowering relatively to elements attached to the wall or the like.
Such suspension devices can be used for all types of sheet-shaped information media, such as posters, and are in particular used for advertising posters. The devices permit a simple putting up and replacement of the posters, as an alternative to pasting on walls and the like. In order to be put up a poster can be fastened to the upper bar while this has been brought to a lowered position by use of the cord system, whereupon the poster and the bars are raised by use of the cord system. The lower bar will due to its own weight keep the poster stretched during raising, and at the end of the raising the lower bar can be hooked into lower elements attached to the wall, whereby the poster is kept stretched vertically in a suspended condition. The elements attached to the wall are presupposed to be able to hold the bars in such a mutual vertical distance that when the upper bar is fully raised and abuts the upper elements, the lower bar abuts the lower elements, whereby the poster is mainly kept stretched in the vertical direction. It is possible to mount springs, in or on the elements or in or on the bars, in order to compensate for a possible difference between the length of the actual poster being used and the length which the poster was intended to have, whereby the poster is stretched despite of this difference in length.
PRIOR ART
A cord system for such a suspension device appears from WO 99/48077, and comprises a single cord which is fastened to an upper element attached to the wall and which runs below two pulleys journalled in the upper bar in the vicinity of the ends thereof, and runs above a third pulley journalled in an upper element attached to the wall, and depends from this third pulley in order to be manipulated for raising and lowering.
Thus, the manipulation takes place by means of the single cord only. During raising the poster may take a slanting position, which is of no importance, because the upper bar will finally abut the two upper wall elements and take a horizontal position. What may occur during raising is that one end of the upper bar abuts one of the upper wall elements before the other end abuts the other wall element, i.e. that the bar is hanging obliquely, but continued pulling of the cord will pull the bar up until it has entered both of the upper wall elements and thus is horizontal. Upon raising of the poster the cord is fastened in a suitable manner.
When such a suspension device is to be used for posters having a large horizontal dimension, for instance several meters, the problem occurs that the upper bar must have a large bending stiffness and consequently has a large cross section, whereby it is heavy, in order not to flex. The result is that raising of the bars will require a large force, and the cord and the wall elements will have to withstand a large load. Flexing may cause that the poster buckles.
SUMMARY OF THE INVENTION
This problem is solved by the present invention. According to the invention the device comprises at least one additional wall element having a pulley for the cord, and the upper bar comprises at least two additional pulleys, whereby the cord runs via the additional wall element or elements. More than one additional wall element can be provided, and a corresponding number of pulleys can be provided in the wall elements and the upper bar. Thereby, the upper bar is suspended by the cord at least in three regions, and the bar will not flex even when it is of a large length.
REFERENCES:
patent: 2591494 (1952-04-01), Asachika
patent: 2910121 (1959-10-01), Stern et al.
patent: 3120895 (1964-02-01), Mahana et al.
patent: 3673720 (1972-07-01), Thornton
patent: 5471774 (1995-12-01), Hoyt et al.
patent: 5471775 (1995-12-01), Hoyt et al.
patent: 5941001 (1999-08-01), Dietrich et al.
patent: 6055754 (2000-05-01), Melhuus
patent: WO 99/48077 (1999-09-01), None
Bacon & Thomas PLLC
Ellingsen Birgitte
LandOfFree
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