Abstract: A fastening device for fastening at least one solar panel to an assembly rail which has a slot bordered by two parallel webs is disclosed. The fastening device includes a locking element with two locking hooks which can be inserted under elastic deformation of at least a part of the locking element into the slot, and which, when the locking element is relaxed, can then reach behind the webs of the assembly rail. The fastening device further includes at least one hold-down element for a solar panel which is connected with the locking element. At least one interlocking element is provided which can be inserted into an interlocked position between the two locking hooks, where the interlocking element prevents the two locking hooks from coming closer to each other.

Abstract: A support structure for solar panels, including at least one support post having a foot part to be anchored in the ground, a head part situated above the foot part to be connected to at least one solar panel, and a connector that joins the head part and the foot part. The connector has at least one clamping bracket that presses the head part against the foot part, whereby the clamping bracket consists of two bolts provided with a thread and of a connecting strut that joins the two bolts to each other, and whereby the two bolts pass through holes in the head part and through holes in the foot part.

Abstract: A connecting device for a frame structure made of support profiles and crossbars for the arrangement of solar panels, as well as a frame structure with a connecting device, is disclosed. The connecting device has a base element, a receptacle element, and a locking device by which the receptacle element can be fixed relative to the base element on the base element. The base element has a fastening section as well as a support section with a support side facing the receptacle element. The receptacle element has a receptacle for a crossbar of the frame structure as well as an application section with an application side facing the base element. The locking device has a clamping device as well as a bearing device. An application area and at least one depression area are provided between the clamping device and the bearing device.

Abstract: A profile arrangement (11) has two coaxially serially disposed sectional girders (12) and having a connecting element (16), the connecting element (16) having a value of its section modulus (Wy1) that differs maximally by 10% from the value of the corresponding section modulus (Wy2) of the sectional girders (12).