Card – picture – or sign exhibiting – Changing exhibitor – Shiftable display item or item support
Patent
1988-06-15
1990-11-20
Brittain, James R.
Card, picture, or sign exhibiting
Changing exhibitor
Shiftable display item or item support
40513, G03B 2302
Patent
active
049708139
DESCRIPTION:
BRIEF SUMMARY
The invention concerns a picture changer, as described and illustrated in the prior patent applications mentioned below: PCT/EP85/00608, PCT/EP85/00615.
The forces that have to be applied when separating an individual picture can be quite considerable, and because the individual parts of the picture changer cannot be manufactured or assembled without tolerance variations, the separating devices are held in active engagement by biassing springs. This spring bias ultimately acts between the housing frame part and the slider member frame part, increases the friction, and necessitates complicated measures to avoid wear and tear.
The invention is based on the problem of constructing a picture changer of this kind in such a manner that it acts easily, and can be manufactured economically with few individual parts.
The solution according to the invention will become apparent from the independent patent claims.
The first aspect of this invention relates to the fact that the separating force for detaching the individual picture from the remainder of the pile is applied only over a slight partial path of the slider member, namely at the start of the slider member withdrawal.
A further aspect of the invention relates to the fact that, over the further path of the slider member, the remainder of the pile is held at a distance from the picture through-gap of the separating device by a special deformation of the separated picture.
A further aspect of the invention relates to a novel combination of the separating means and a device which enables the change-over function to be interrupted.
A further aspect of the invention concerns the construction of retaining systems which hold the individual picture securely in one frame part and safeguard it against becoming twisted.
A first such system comprises a special embodiment of a system of pressure springs such that a part of the same simultaneously forms a part of such a retaining system. A second retaining system comprises stop members integrally moulded on one of the frame parts, the sheet being presented to these stop members in such a manner that it is unable to slip off them. A third retaining system comprises an element which is arranged in the first frame part, is provided with teeth and which can be displaced in the direction of movement of the frame parts between an active and an inactive position.
Finally, a further aspect of the invention concerns a modified construction of the separating means, in which a spring bias between the separating elements defining a through-gap is not absolutely necessary.
Examples of embodiments of the subject of the invention are described in detail hereinafter with reference to the accompanying drawings.
FIG. 1 shows a longitudinal section through a picture changer according to the invention after the start of the rearranging operation,
FIG. 2 shows a perspective view of a component of the changer,
FIG. 3 is a section analogous to FIG. 1, but in the closed position of the changer,
FIG. 4 is a cross-section through the changer of FIG. 1 in the region of the separator bar,
FIG. 5 shows a later phase of the rearranging operation in a view analogous to FIG. 1,
FIG. 6 shows an analogous following phase,
FIG. 7 is a plan view onto one of the two symmetrically arranged springs, shown pressed down flat,
FIG. 8 shows, in a view similar to FIG. 4, a section in the separator region in the position of the frame parts shown in FIG. 6,
FIG. 9 shows, schematically, and exaggeratedly, the effect of the picture deformation shown in FIG. 8,
FIG. 10 shows, in a view similar to FIG. 1, the relative position of the components when the removal element is actuated,
FIG. 11 shows schematically a variation of the retaining system for the individual sheet,
FIG. 12 shows schematically a further modification of this system,
FIG. 13 shows in partial cross-section the retaining functional elements of a further embodiment,
FIG. 14 shows, in a view similar to FIG. 13, the functional elements in a different operating position,
FIG. 15 shows one of the elements in a
REFERENCES:
patent: 4259802 (1981-04-01), Ackeret
patent: 4376348 (1983-03-01), Ackeret
patent: 4801016 (1989-01-01), Irrgeher
Brittain James R.
Jackson Robert R.
Licinvest AG
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