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US 12,644,483 B2Granted
Multi-piece fastener comprising a tapered threaded portion and method of fastening
AssigneeHowmet Aerospace Inc.
InventorsJustin S. Branch, Robert B. Wilcox
Life of this patent
Estimating the term…
Abstract
A fastener comprising a pin and a collar. The pin comprising a shank comprising a tapered lock groove thread profile; and a head portion configured to receive a torque. The collar configured to be deformed onto and secured to the shank, wherein the collar comprises an external surface configured to receive a torque such that the collar can be removed from the shank after deformation.
Claims20
A lockbolt fastener comprising:
- a fastening collar comprising
- a first collar end,
- a second collar end,
- an inner collar surface extending from the first collar end to the second collar end and defining a collar cavity, and
- an external collar surface comprising a first surface region configured to receive a torque and a second surface region adjacent to the first surface region, wherein the second surface region comprises a substantially cylindrical shape;
- and
- a pin configured to be at least partially received by the collar cavity, the pin comprising
- a first pin end,
- a second pin end comprising a head portion, and
- a shank extending intermediate the first pin end and the second pin end, wherein the shank comprises
- a pull region, and
- a tapered threaded portion intermediate the pull region and the second pin end, wherein a diameter of the tapered threaded portion decreases in a direction towards the first pin end, and wherein the inner collar surface is configured to be deformed onto the tapered threaded portion and secured to the shank, and wherein the tapered threaded portion includes a continuous thread such that the fastening collar is configured to be removed from the shank after deformation by applying a torque to the first surface region of the external collar surface.
9 more elements
A method for fastening, the method comprising:
- inserting a first pin end of a multi-piece fastener into a bore in a structure, the multi-piece fastener comprising
- a fastening collar comprising
- a first collar end,
- a second collar end,
- an inner collar surface extending from the first collar end to the second collar end and defining a collar cavity, and
- an external collar surface comprising a first surface region and a second surface region adjacent to the first surface region, wherein the second surface region comprises a substantially cylindrical shape, and
- a pin configured to be at least partially received by the collar cavity, the pin comprising
- the first pin end,
- a second pin end comprising a head portion, and
- a shank extending intermediate the first pin end and the second pin end, wherein the shank comprises a pull region, and a tapered threaded portion intermediate the pull region and the second pin end, wherein a diameter of the tapered threaded portion decreases in a direction towards the first pin end, wherein the tapered portion includes a continuous thread;
- deforming the inner collar surface onto the tapered threaded portion thereby securing the pin to the fastening collar, and
- subsequent to deforming the inner collar surface, removing the fastening collar from the pin by applying a torque to the external collar surface.
9 more elements
Dependencies are inferred from the claim text.