Illumination – Light modifier – Reflector
Patent
1991-06-03
1993-11-23
Cole, Richard R.
Illumination
Light modifier
Reflector
362347, F21V 1102
Patent
active
052649997
DESCRIPTION:
BRIEF SUMMARY
The invention concerns a light screen with curved outside reflectors and perpendicular cross lamellas with roughly V-shaped cross-section, each of which is inserted into the outside reflectors through corresponding cut-outs, whereby the walls of the cross lamella feature bracket edges on the top which are arranged on the inside of the outside reflectors.
Such a light screen is already known from DE 30 05 762 C2. In this known light screen the cross lamella features a cross slot whereby for the purpose of attaching the cross lamella to the outside reflector the bottom of each cut-out of the outside reflectors is inserted into a cross slot of a cross lamella.
As a result, in this light screen the cross lamella had to be suspended in the outside reflector in the form of a circular motion in order to mount both parts in the right position, i.e. to bring the cross lamella into the outside reflector for locking. To this effect, the cross slot of the cross lamella was first introduced into the cut-out of the outside reflector and then the cross lamella was rotated with a circular motion onto the outside reflector whereby the outside reflector featured projections which locked in locking slot at the cross lamella.
As a result, mounting of the cross lamella to the corresponding outside reflectors could only be done at great effort, and could not be done by machine.
Task of the present invention is to effect an attachment between a cross lamella and an outside reflector of a light screen which can be done by machine and in a simple manner.
According to the present invention, a light screen is provided which comprises a pair of spaced outer reflectors and a plurality of cross lamellas extending transversely between the outer reflectors. The outer reflectors have aligned pairs of openings and the lamellas have projecting ends which are designed to project through the aligned openings at opposite ends of each lamella. Each lamella is of V-shaped cross-section and the openings in the reflectors are of substantially matching V-shape. Each lamella comprises a pair of flaps joined together at the lower end of the lamella to form the V-shape. The flaps are cut away at their upper and lower edges at opposite ends of each lamella to form a stepped region for bearing against the inner surface of the respective reflector when the projecting ends extend through the respective openings. The projecting ends of each flap include an outward projection for resting against the outer surface of the reflector when the projecting ends extend through the openings, and an inwardly bent portion forming a wedge-shaped surface at the outermost end of the lamella.
This new type of attachment makes it possible for the very first time to drive the cross lamella in the direction of its longitudinal axis straight into the cut-out of the perpendicular outside reflector thus effecting a self-activated locking of the cross lamella in the cut-out of the outside reflector. A swinging motion as required by the known light screens for driving the cross lamella is no longer necessary in accordance with the invention. As a result, a simple mounting of such cross lamellas by machine in outside reflectors is now possible.
The making of the outward projections is particularly simple. It is also very simple to punch out the stepped regions thus producing an inexpensive slide-in part without cumbersome deformation. An outward projection or ridge can be made by chamfering the material of the cross lamella and forming an outwardly deformed edge protruding from the plane of the cross lamella. It is also possible to make such a by forming a crease.
In the preferred embodiment the front-side edges of the cross lamella are bent inwardly to form wedge-like surfaces which are tapered and preferably curved at their outermost edges, the surfaces facing outwardly in the longitudinal direction of the cross lamella.
Bending of the front-side edges of the cross lamella can be accomplished in a simple manner resulting in a simple centric drive into the cut-out of the outer re
REFERENCES:
patent: 4268897 (1981-05-01), Schierwagen et al.
patent: 4888668 (1989-12-01), Roll
patent: 5029059 (1991-07-01), Grimm
Cole Richard R.
Heyman L.
Zumtobel AG
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