Optical: systems and elements – Projection screen
Reexamination Certificate
1999-10-15
2001-10-16
Mahoney, Christopher E. (Department: 2851)
Optical: systems and elements
Projection screen
C359S446000, C359S450000, C248S479000, C248S480000, C248S486000, C160S127000
Reexamination Certificate
active
06304377
ABSTRACT:
The invention relates to a wall and/or projection board according to the preamble of claim
1
.
So-called flip-chart wall boards, projection walls for the professional presentation of slides or films or the use of overhead projectors or in the form of white boards which are provided with grid elements and on which it is possible to write using felt-tip pens, and/or in the form of pinboards or so-called magnetic boards, are very popular, in particular for professional use. Apart from flip charts, which are often designed as separate stand elements, use is otherwise made of wall and/or projection boards which can be engaged in a horizontal rail fastened on the wall. The engagement can take place by means of hooks or, for example, also with the use of rollers, in order for it to be possible for the elements of the wall and/or projection boards to be displaced more easily.
Different wall or projection boards are required for the different application purposes. This is because the type of surface for wall boards upon which it is possible to write usually differs from that for so-called projection walls which are required for the presentation of slides or films or the use of overhead projectors. Instead of using two different wall boards for the different application purposes, it is thus also known, in principle, to use a wall-board element which has differently configured front and rear sides for the different application purposes. However, this requires such a wall-board element, depending on the application purpose, to be disengaged from the wall rail, rotated through 180° and then engaged again. Since this is laborious, such wall-board elements which can be used on both sides have not gained widespread acceptance.
The object of the present invention is thus to provide an improved wall and/or projection board which is better suited to the different application purposes.
The object is achieved according to the invention by the features specified in claim
1
. Advantageous configurations of the invention are specified in the subclaims.
The wall and/or projection board according to the invention usually has different types of surfaces on the front and rear sides, with the result that the wall panel can preferably be used for two different application purposes. If required, however, it is also possible for the front and rear sides to be of the same type, but such that both surfaces of the resulting wall and/or projection board can be used.
The solution according to the invention is distinguished, in particular, in that such a wall and/or projection board can easily be turned in a single movement, i.e. just with one hand.
The invention provides at least one engagement element which is engaged in an engagement rail, is arranged, for example, on the left-hand vertical border region of the wall-board element and is connected to the latter via a vertical pivot connection. By gripping the wall-board element, for example, on the opposite side, it is possible for the wall board to be disengaged from the wall rail there, for example by straightforward lifting, and for the wall panel then to be pivoted through 180° about the engagement element which remains engaged on the left-hand side in the horizontal engagement rail, until the originally right-hand side of the wall panel then comes to rest on the left-hand side in front of the wall and, by virtue of the 180°-rotation, the initially rear, concealed top side of the wall panel is now oriented toward the front.
If, on the two opposite sides, the engagement elements respectively provided there are connected to the wall-board element via a vertical pivot connection, then such a wall-board element may be rotated, as desired, through 180° in each case from left to right or from right to left in order to turn the board element. If, for example, a top side is provided with a special reflective coating, then this side may preferably be used for the presentation of slides or films or the use of an overhead projector, whereas the other, opposite top side for example may be configured as a top side upon which it is possible to write. One or both surfaces may also be configured in this case, with the use of metal elements, as magnetic boards.
A particularly preferred embodiment is achieved when the respectively vertical pivot spindle is formed by a vertical rod which is located both on the left and right of the actual wall-board element and on which the respective engagement element is fastened preferably in the top half of this retaining rod. This means that all that is required for turning the board is to grip the relevant vertically running rod and to disengage the associated engagement element from the horizontal rail by lifting, in order then to rotate the board through 180° in each case about the opposite vertical rod, which remains engaged in the engagement rail and forms a vertical pivot spindle. In other words, the respectively opposite retaining rod remains unpivoted during the pivoting operation, with the result that the actual wall-board element is pivoted relative to the vertical rod which does not rotate along with it in each case. It is also the case, however, that the vertical rod gripped by the hand maintains the same aligned position in relation to the wall during the pivoting operation, with the result that throughout the entire pivoting operation, from the disengagement of the associated engagement element until the latter is engaged again in the position in which the wall-board element has been rotated through 180°, said engagement element does not rotate relative to the pivoting operation of the board, in other words the engagement element always remains aligned in relation to the wall during this pivoting operation. The renewed engagement following completion of the pivoting of the wall-board element can thus be carried out without difficulty.
The engagement elements, which preferably comprise rollers, may be provided in the top region of the wall-board element, i.e. even above the top edge of the actual wall-board element, but may also be provided at a lower level. The rollers are preferably provided in a region between a central horizontal plane and the top edge region of the wall-board element. In particular in this case, the spacing between the vertical retaining rods, which form the pivot spindles relative to the actual wall-board element, and the border of the actual wall-board element is dimensioned to be of such a magnitude that, during the turning operation, the associated engagement element, preferably in the form of the abovementioned roller, can be pivoted through said gap.
REFERENCES:
patent: 2894576 (1959-07-01), Williams
patent: 4226037 (1980-10-01), Rodriguez
patent: 685913 A5 (1995-11-01), None
patent: 4437 113 A1 (1996-04-01), None
patent: 1.272.106 (1960-04-01), None
Cruz Magda
Mahoney Christopher E.
Nixon & Vanderhye
Werndl BüroMöbel AG
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