Source: {"pile_set_name": "USPTO Backgrounds"}

Securing arrangements are known in prior art. For example, a screw terminal is known from DE 296 21 267 U1 in which the head of the screw is covered up by a housing cover, up to the screwdriver opening. Shaped ribs are provided which are axially distributed over the perimeter on the housing cover, which are a very short distance from one another, less than the diameter of the screw head. When screwing the terminal screw in, the ribs are deformed and abraded in this prior art. Due to the elasticity of the ribs, the screw is received partially countersunk into the cover housing.
It is a disadvantage in this prior art, though, that the ribs extending in the longitudinal direction of the screw to the housing cover have to be manufactured to correspond exactly to the screws to be used, in order to guarantee a secure operation. The tolerances to be met are dimensioned very narrowly, since the ribs, on the one hand, have to enable the screw to be screwed in without ruining the housing cover by overscrewing, while on the other hand, the screw has to be held securely after insertion.
This leads to the need to hold to the measurements exactly and causes high manufacturing expense and consequently higher production costs.
A series terminal is known from DE 30 28 958 C2, in which the terminal screw can be disposed sunk into a shaft of a body. In the shaft, a section is provided which allows elastic deformation when screwing in the screw and when painting over the head. After painting over the section, the section only partially deforms back again, so that the section executed serves as a locking device.
Also, in this arrangement known from prior art, very close coordination of the structural dimensions and the observance of very close manufacturing tolerances is required to reliably prevent ruining the component when screwing and to prevent loss of the screw inserted.
Furthermore, devices are known from prior art in which a rib is provided running around the shaft receiving the screw, which exhibits an open inside diameter smaller than the large outside diameter of the head of the screw. If a screw is inserted into such a shaft and goes past the ring-shaped rib, then it is received countersunk in the shaft. Also, for a functioning solution, this requires, however, precise coordination of the manufacturing tolerances, since with automated screw assembly, the screw shanks can be torn off otherwise, if the turning force exceeds the strength of the component when pressing on the head of the screw. Such a system works with slower assembly by hand or also when holding precisely to the tolerances, which in turn causes considerable manufacturing engineering expense and consequently higher costs.