Abstract: A device to detachably connect two, e.g., plate-shaped subassemblies, includes a control element with a projecting retaining portion which can be inserted into aligned openings of the subassemblies and with a head portion to be braced against the first subassembly. The projecting retaining portion has at least one lateral first recess to receive and engage with at lest one locking element of a holding element. The locking element yields flexibly and resiliently when inserting the control element into the holding element. The holding element also has expanding elements to brace against a rear side of the second subassembly. Both the control element and the holding element can be inserted individually in succession or together from a front side of the first subassembly into the aligned openings. The holding element with the expanding elements can be inserted into the openings.

Abstract: A fastener for joining together two components includes a closure pin permanently securable to a first component and a receptacle disposed on the far side of a second component. The closure pin has a head section adapted for support in an outer side of the first component and a shank section extending through a hole in the first component and a hole in the second component aligned with the hole in the first component and having a thread mating with an internal thread in a fastening section of the receptacle. The peripheral surface of the closure pin has a radial taper zone with a stop face radially extended on the opposite side from the head section and formed by a rim stop. The stop face engages with a safety element to prevent complete extraction of the closure pin from the hole in the first component. The safety element is disposed in a groove open to the hole in the first component.

Abstract: A fastener apparatus for joining together a plurality of plates, including an internally-threaded pin adapted to be guided through aligned openings in the plates and a generally cup-shaped accommodating element that can be tightened with the pin via a threaded bolt mounted centrally therein. The accommodating element carries one or more springs for yieldably resisting entry of the pin and further carries two locking washers accommodated on the threaded bolt, for preventing an unintended loosening of the pin out of its tightened position. The locking washer that faces the pin is rotatably guided and axially displacable up to an external stop of the accommodating element, and the locking washer that faces away from the pin is rotation-fast but guided in displacable fashion within the accommodating element, axially against yielding bias of the spring.