The rigid blade may include a reinforcing rib positioned thereon.

In order to improve strength and rigidity without increasing sheet thickness, a method for easily forming a rib as a reinforcing material in press moldings and a press molding having a reinforcing rib are provided.

Fiber bundles (3) are provided in the reinforcement rib (2) and extend lengthwise therein.

Each stiffening rib is formed so as to substantially match a contour of the associated reflector.

A reinforcement rib (25) which extends close to the ends of the switching shaft is provided on the outside of the switching shaft (11).

Further, a reinforcing rib is installed to connect the projection to the other portion than the projection of the side wall, the reinforcing rib increasing the mechanical strength of the projection.

A woven-belt reinforcing rib (3) is compounded on the surface of at least one layer of spherocolloid (2).

The reinforcing rib (3) is composed of split ribs arranged in the longitudinal direction with gaps (30) in between.

At least one area on each stiffening rib is suitable for accommodating a polymer-based adhesive for bonding the rib to a side of the associated reflector facing away from the sun.

Maximum load per shelf: without reinforcement RIB – according to the RAL standard: 75 kg

The number, cross-sectional shape (shape of drawing), depth, width, etc. of the reinforcement ribs are optimally adjusted.

Maximum load per shelf: without use of reinforcement bar – according to the RAL standard: 155 kg.

A section between each reinforcement rib is formed flat.

Each reflector has a stiffening rib (60a) associated therewith and is attached thereto on a side facing away from the sun.

The compartment and/or stiffening rib consists of a fold in the body portion and is disposed within the body portion.