Asymmetric fastener recess and key

Patent metadata

Field	Value
Publication number	US-9970469-B2
Application number	US-201414503582-A
Country	US
Kind code	B2
Filing date	Oct 1, 2014
Priority date	Oct 1, 2013
Publication date	May 15, 2018
Grant date	May 15, 2018

Abstract

A fastening system including a pin member and a key for engaging the pin member. The pin member includes a shank portion and a recess formed within an end face of the shank portion. The recess includes a plurality of splines and recesses that form first and second bearing surfaces oriented at angles. The key includes a key head having a plurality of splines and grooves that form first and second bearing surfaces oriented at angles. The plurality of splines and recesses of the pin member and the plurality of splines and recesses of the key are adapted to communicate with each other when tightening and loosening the pin member.

First claim

What is claimed is:

1. A fastening system, comprising:
a pin member including an elongated shank portion having a first end, a second end opposite the first end, and an end face located at the second end and having a recess formed therein,
wherein the recess includes a plurality of splines extending axially and positioned circumferentially about a periphery thereof and extending inwardly, wherein each of the plurality of splines includes a first bearing surface and a second bearing surface,
wherein the recess includes a plurality of recesses extending axially and formed circumferentially about the periphery, each of the plurality of recesses being located between a corresponding pair of the plurality of splines,
wherein each of the first bearing surfaces of each of the plurality of splines of the recess is oriented at a first angle extending and measured from a radial line that extends from a center point along a longitudinal axis of the elongated shank portion of the pin member to a first point on such first bearing surface located proximate to a minor inner diameter of such spline of the pin member in a rotational direction towards the second bearing surface of such spline, the first angle being within a range of about 1° to about 5°,
wherein each of the second bearing surfaces of each of the plurality of splines is oriented at a second angle extending and measured from the radial line in a rotational direction opposite the first bearing surface of such spline towards such second bearing surface of such spline, wherein the second angle is greater than the first angle; and
a key including an elongated shaft having a first end and a second end opposite the first end of the elongated shaft, and a key head located at the second end of the elongated shaft,
wherein the key head includes a plurality of splines extending axially thereon, each of the plurality of splines of the key head having a first bearing surface and a second bearing surface, and wherein the key head includes a plurality of grooves extending axially thereon, each of the plurality of grooves being located between a corresponding pair of the plurality of splines of the key head,
wherein each of the first bearing surfaces of each of the plurality of splines of the key head is oriented at a third angle extending and measured from a radial line that extends from a center point along a longitudinal axis of the key to a first point on such first bearing surface of such spline of the key head located proximate to a major outer diameter of such spline of the key head in a rotational direction towards the second bearing surface of such spline of the key head, the third angle being within a range of about 1° to about 5°,
wherein each of the second bearing surfaces of each of the plurality of splines of the key head is oriented at a fourth angle extending and measured from the radial line of the key head in a rotational direction opposite the first bearing surface of such spline and towards such second bearing surface of such spline of the key head wherein the fourth angle is greater than the third angle, and
wherein the key head of the key is adapted to mate with the recess of the pin member such that each of the first bearing surfaces of each of the plurality of splines of the key head is sized and shaped to engage the first bearing surface of a corresponding one of the plurality of splines of the pin member, and each of the second bearing surfaces of each of the plurality of splines of the key head is sized and shaped to engage the second bearing surface of a corresponding one of the plurality of splines of the pin member.

2. The fastening system of claim 1 , wherein the plurality of splines of the pin member includes six of the splines and wherein the plurality of recesses of the pin member includes six of the recesses, and wherein the plurality of splines of the key includes six of the splines and the plurality of grooves of the key includes six of the grooves.

3. The fastening system of claim 1 , wherein the second angle and the fourth angle are each within a range of about 30° to about 35°.

4. The fastening system of claim 1 , wherein the plurality of splines of the pin member includes eight of the splines and wherein the plurality of recesses of the pin member includes eight of the recesses, and wherein the plurality of splines of the key includes eight of the splines and the plurality of grooves of the key includes eight of the grooves.

5. The fastening system of claim 1 , wherein the second angle and the fourth angle are each within a range of about 40″ to about 50°.

6. The fastening system of claim 1 , wherein a corresponding pair of the first bearing surface and the second bearing surface of each of the plurality of splines of the pin member are perpendicular to one another, and wherein a corresponding pair of the first bearing surface and the second bearing surface of each of the plurality of splines of the key are perpendicular to one another.

7. The fastening system of claim 1 , further comprising a nut, and wherein the elongated shank portion of the pin member includes a threaded portion located at the second end thereof and having a plurality of external threads, and wherein the nut is adapted to engage threadedly the threaded portion of the pin member.

8. The fastening system of claim 7 , wherein the nut includes a centrally-located bore that is sized and shaped to receive the key therethrough.

9. A fastening system, comprising:
a pin member including an elongated shank portion having a first end, a second end opposite the first end, and a head located at the first end and having a recess formed therein,
wherein the recess includes a plurality of splines extending axially and positioned circumferentially about a periphery thereof and extending inwardly, wherein each of the plurality of splines includes a first bearing surface and a second bearing surface,
wherein the recess includes a plurality of recesses extending axially and formed circumferentially about the periphery, each of the plurality of recesses being located between a corresponding pair of the plurality of splines,
wherein each of the first bearing surfaces of each of the plurality of splines of the recess is oriented at a first angle extending and measured from a radial line that extends from a center point along a longitudinal axis of the elongated shank portion of the pin member to a first point on such first bearing surface located proximate to a minor inner diameter of such spline of the pin member in a rotational direction towards the second bearing surface of such spline, the first angle being within a range of about 1° to about 5°,
wherein each of the second bearing surfaces of each of the plurality of splines is oriented at a second angle extending and measured from the radial line in a rotational direction opposite the first bearing surface of such spline and towards such second bearing surface of such spline wherein the second angle is greater than the first angle; and
a key including an elongated shaft having a first end, and a second end opposite the first end of the elongated shaft, and a key head located at the second end of the elongated shaft,
wherein the key head includes a plurality of splines extending axially thereon, each of the plurality of splines of the key head having a first bearing surface and a second bearing surface, and wherein the key head includes a plurality of grooves extending axially thereon, each of the plurality of grooves being located between a corresponding pair of the plurality of splines of the key head,
wherein each of the first bearing surfaces of each of the plurality of splines of the key head is oriented at a third angle extending and measured from a radia

Assignees

• Alcoa Inc
• Arconic Inc

Inventors

• Pinheiro Rodrigo
• Haylock Luke

Classifications

• F16B23/003 Primary

  star-shaped or multi-lobular, e.g. Torx-type, twelve-point star · CPC title

• F16B35/045

  for retention or rotation by a tool (specially shaped heads of bolts or screws for rotation by a tool F16B23/00) · CPC title

• F16B19/02 Primary

  Bolts or sleeves for positioning of machine parts, e.g. notched taper pins, fitting pins, sleeves, eccentric positioning rings · CPC title