| 摘要 |
Apparatus for stretching sheets of synthetic material across rigid frames, such as those used in sunray captors, are disclosed. The apparatus includes at least one lateral U-shaped groove extending perpendicularly from the plane of an upstanding substantially planar rigid frame base, the U-shaped grooves including a pair of lateral arms with free ends and a central portion comprising the rigid frame base, the free ends converging towards each other to define a waist portion for the U-shaped groove, and first and second rigid rods disposed within the U-shaped groove and lockable therein, the first rigid rod including a pair of concave symmetrical surfaces on opposing portions thereof defining a waist portion, and a second rigid rod being substantially cylindrical and including a convex exterior surface whereby a sheet of synthetic material may be locked tightly in position within the U-shaped groove by passing at least partially around one of the rigid rods and then between those rods so that the sheet material is fixed in position between the convex exterior surface of the second rigid rod and one of the concave grooves defining the waist portion of the first rigid rod and between one of the rods and the converging free end of the lateral arm of the adjacent U-shaped groove. |
