One piece screws for, and methods for making and using, blind side fasteners and systems with free spin feature
A fastener with a freely translatable collet body, which at least partially translates within an auxiliary structure, and further comprise a captive threaded screw for rotationally engaging with the collet body to transform rotational movement into translational movement through substantial arresting of collet body rotation by way of an anti-rotation means. The screw comprises a free-spin feature that functionally, but not physically, decouples a drive tool from the collet body.
1. A single sided fastener comprising:
an auxiliary structure including a housing, a proximal orifice positioned within the housing adjacent to a proximal end of the auxiliary structure, and an axially aligned bore positioned within the housing, where the axially aligned bore includes a first anti-rotation section having a non-circular cross section;
a collet body including a threaded portion and a second anti-rotation section mating with the first-anti-rotation section to prevent rotation between the collet body and the auxiliary structure while allowing axial translation between the collet body and the auxiliary structure, the second anti-rotation section having a non-circular cross-section, the collet body including a plurality of radially displaceable fingers with a plurality of workpiece gripping elements in exterior surfaces of the plurality of radially displaceable fingers;
a screw captively retained in the auxiliary structure and in a first configuration rotationally engaging with the threaded portion of the collet body to transform rotational movement thereof into axial translation of the collet body, wherein the screw includes a screw head with a drive tool interface receiving a rotary force imparted by a drive tool, a screw head flange positioned in the proximal orifice of the auxiliary structure, and a non-threaded portion axially positioned between a distal threaded portion of the screw and a proximal threaded portion of the screw, wherein when the screw is in a second configuration the non-threaded portion is aligned with the threaded portion of the collet body, the screw freely spins within the collet body, and wherein axial translation of the screw initiates interaction between the plurality of radially displaceable fingers and the distal threaded portion of the screw; and
a retaining ring positioned in the auxiliary structure axially retaining the screw head flange.
2. The single sided fastener of claim 1 , where the non-threaded portion of the screw has a smaller diameter than a diameter of the distal threaded portion of the screw.
3. The single sided fastener of claim 1 , where the collet body is captively retained in the auxiliary structure.
4. The single sided fastener of claim 1 , where the auxiliary structure includes a tool interface including facets designed to receive a tool.
5. The single sided fastener of claim 4 , where the auxiliary structure includes an exterior work piece contacting surface positioned below the tool interface.
6. The single sided fastener of claim 1 , where the first anti-rotation section and the second anti-rotation section include corresponding planar surfaces.
7. The single sided fastener of claim 6 , where the first anti-rotation section and the second anti-rotation section have hexagonal shapes.
8. The single sided fastener of claim 1 , where the distal threaded portion of the screw and the proximal threaded portion of the screw have equivalent diameters.
9. The single sided fastener of claim 1 , where the distal threaded portion of the screw extends to an end of the screw.
10. The single sided fastener of claim 1 , where when the non-threaded portion of the screw is aligned with the threaded portion of the collet body the distal threaded portion of the screw does not interact with the plurality of radially displaceable fingers.