Device for fixing insulating strips
AssigneeSFS Industrie Holding AG
InventorStefan Baumgartner
Life of this patent
Estimating the term…
Abstract
In a fastening element (1) for fastening insulating sheets and if necessary sealing sheets to a solid base there are provided a screw (5) and a large-surface washer (6), wherein the screw (5) has a drilling point (7), a screw shank (9) provided at least partly with a threaded region (8) as well as a screw head (10). The washer has a central hole (21) for introducing the screw shank. A tubular extension (20) aligned axially parallel to the screw shank (9) to be inserted adjoins the central hole (21) in the washer (6). Sections or parts of this extension (20) engage by plastic deformation in the threaded region (8) of the screw shank (9) to achieve preassembled retention of the washer (6) and screw (5).
Claims8
A fastening element for fastening insulating sheets or panels to a solid base, said element comprising a screw (5) and a large-surface metal washer (6), wherein the screw (5) has a drilling point, a screw shank provided with a thread at least over part of its length and a screw head, and the washer has a hole (21) for introducing the screw shank (9), wherein the washer (6) is preassembled at a distance from the screw head in a region of the screw shank (9) such that it is secured against inadvertent axial shifting and wherein a tubular extension (20) aligned axially parallel to the screw shank (9) to be inserted adjoins the central hole (21) in the washer (6), at least a portion of the extension (20) is plastically deformed into the threaded region (8) of the screw shank (9) by point-like or slot-like radial indentations (22) in order to retain the screw (5) in position in the washer (6).
A method for preassembly of a large-surface washer in a threaded region of a screw shank of a screw so as to secure against inadvertent axial shifting, comprising loosely introducing the screw (5) into a central hole (21) in the washer (6) until the washer (6) is disposed at a desired distance from the head (10) of the screw (5), and thereafter squeezing, radially inward in point-like or slot-like manner on a tubular extension (20) formed or inserted in a region of the central hole (21) of the washer (6) by local application of radial force to achieve plastic deformation of at least partial sections of the extension (20) toward the threaded region (8) of the screw shank (9).
Dependencies are inferred from the claim text.