Floating barrel nut assembly and related methods

Abstract

A floating barrel nut may be used to retain a nut in a seat of a segmented cylindrical slug. In one embodiment, the barrel nut according to this disclosure may comprise: a nut with a threaded shaft and a flange that is chamfered on its lower end; a cylindrical slug that has been segmented along a plane that is parallel to the cylindrical axis, said slug having a head and a foot; two pins; wherein said nut is configured to float between the head and foot of the slug; wherein said shaft features an indentation on opposite sides thereof; and, wherein said pins are attached to the head and foot of the slug and sit in the indentations of the shaft. In another embodiment the pins are bent around the shaft.

Claims

1. A method of fastening two items comprising the steps of: obtaining a barrel nut comprising a nut with a threaded shaft where the nut is floatably seated in a seat of a slug between a head of the slug and a foot of the slug, said nut further comprising a base with a flange, said slug featuring at least one pin connected between said head and foot of the slug, and wherein said at least one pin operates to floatably retain said nut in the seat by said at least one pin being positioned over the flange; and, placing the barrel nut in a hole of a first one of said two items so that a threaded shaft of the barrel nut is positioned: (a) transverse to an axis of said hole of the first one of said two items; and, (b) aligned with a access hole in a second one of said two items.

2. The method of claim 1 wherein the barrel nut unit further comprises: the flange featuring at least one chamfer.

3. The method of claim 2 wherein said at least one pin is a plurality of pins and wherein said plurality of pins are bowed.

4. The method of claim 3 wherein said nut features an indentation.

5. The method of claim 2 wherein said nut features an indentation.

6. The method of claim 5 wherein said indentation is located proximate to a meeting of the base of said nut and said flange.

7. The method of claim 2 wherein said flange features two chamfers.

8. The method of claim 2 wherein said at least one pin is connected at the head and foot of said slugs and at corresponding pin holes along a periphery of said head and foot.

9. The method of claim 8 wherein a distance from the periphery and an axis of said pin holes is within the range of 0.057 inch to 0.0967 inch.

10. A method of fastening two items comprising the steps of: obtaining a barrel nut assembly comprising: a nut with a cylindrical shaft, said nut being floatably seated in a slug; said nut further comprising indentations on opposite sides of the shaft; and, a plurality of pins that are connected to opposites ends of the slug so that (a) said nut is retained while floatably seated in said slug and (b) a portion of said pins is positioned near said indentations; and, placing the barrel nut assembly in a hole of a first one of said two items so that the cylindrical shaft of the barrel nut is positioned: (a) transverse to an axis of said hole of the first one of said two items; and, (b) aligned with a access hole in a second one of said two items.

11. The method of claim 10 wherein said plurality of pins are bowed.

12. The method of claim 10 wherein said nut further comprises a chamfered flange at a base of the shaft.

13. The method of claim 12 wherein the base has opposite sides and said flange is defined by the two chamfers being on opposite sides of the base.

14. A method of fastening two items comprising the steps of: obtaining a barrel nut assembly comprising: a nut with a cylindrical bore and a base, said nut seated in a slug; said nut further comprising a flange at said base; at least two pins connecting opposite ends of said slug; and said pins being fixed in apertures located along an outer periphery of each of the opposite ends of said slug; and, placing the barrel nut assembly in a hole of a first one of said two items so that the cylindrical shaft of the barrel nut is positioned: (a) transverse to an axis of said hole of the first one of said two items; and, (b) aligned with a access hole in a second one of said two items.

15. The method of claim 14 wherein a distance from a center point of the apertures located along said outer periphery to an edge of the slug end of the barrel nut assembly is in the range of 0.057 inch to 0.0967 inch.

16. The method of claim 14 wherein the flange of the barrel nut assembly features a chamfer.

17. The method of claim 14 further comprising two indentations in opposite sides of the nut.

18. The method of claim 17 wherein the nut transversely floats between said pins located in an indentation.

19. The method of claim 18 wherein said pins are bowed.

20. The method of claim 14 wherein said pins are bowed.

Description

BRIEF DESCRIPTION OF THE FIGURES

(1) Other objectives of the disclosure will become apparent to those skilled in the art once the invention has been shown and described. The manner in which these objectives and other desirable characteristics can be obtained is explained in the following description and attached figures in which:

(2) FIG. 1 is a perspective view of a barrel nut assembly;

(3) FIG. 2 is a left side view of the barrel nut assembly of FIG. 1;

(4) FIG. 3 is a right side view of the barrel nut assembly of FIG. 1;

(5) FIG. 4 is a front side view of the barrel nut assembly of FIG. 1;

(6) FIG. 5 is a back side view of the barrel nut assembly of FIG. 1;

(7) FIG. 6 is top view of the barrel nut assembly of FIG. 1;

(8) FIG. 7 is a bottom view of the barrel nut assembly of FIG. 1;

(9) FIG. 8 is an exploded view of the barrel nut assembly of FIG. 1;

(10) FIG. 9 is cross-section view of the barrel nut assembly of FIG. 1; and,

(11) FIGS. 10A and 10B are respectively front and back views of a NAS577 barrel nut assembly.

(12) FIGS. 11A and 11B illustrate dimensions of the components of the barrel nut assembly of FIG. 1.

(13) FIG. 12 is a top view of an alternative embodiment of the barrel nut assembly of FIG. 1.

(14) It is to be noted, however, that the appended figures illustrate only typical embodiments of this invention and are therefore not to be considered limiting of its scope, for the invention may admit to other equally effective embodiments that will be appreciated by those reasonably skilled in the relevant arts. Also, figures are not necessarily made to scale but are representative.

DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS

(15) Disclosed generally is a floating barrel nut assembly with improved means for retaining a nut in a seat of a segmented cylindrical slug and related methods. In a preferred embodiment, a barrel nut according to this disclosure has a floating nut with a shaft and chamfered flange that is retained in a seat of a segmented cylindrical slug by pins that are attached at opposite ends of the seat whereby the pins are provided over the flange and around the shaft of the floating nut. The more specific aspects of this disclosure are described with reference to the attached FIGS. 1 through 9.

(16) FIGS. 1 through 9 are respectively, a perspective view, a left side view, a right side view, a front side view, a back side view, a top view, an exploded view, and a cross-section view of a barrel nut assembly 100. As shown in the drawings, the barrel nut assembly 100 features: a slug 110; a floating nut 120; and pins 130. The floating nut 120 is preferably configured to sit in the slug 110 so that it is retained thereby the pins 130.

(17) The slug 110 is depicted in FIGS. 1 through 9. Referring to FIG. 8, the slug 110 is generally shaped like cylinder that is segmented by a plane that is parallel to the axis of the cylinder. Still referring to FIG. 8, the slug 110 features a cut-out forming a head 111, foot 112, and seat 113. As discussed further below and alluded to in FIG. 8, a floating nut 120 may preferably be seated in the seat 113 of the slug 110 between the head 111 and foot 112.

(18) The floating nut 120 is shown in FIGS. 1 through 9. As best seen in FIGS. 8 and 9, the floating nut 120 is defined by a shaft 121 and a flange 122. As shown in FIGS. 8 and 9 the shaft is generally cylindrical with (1) a threaded bore 123 disposed therethrough and (2) indentations 124 on opposite sides thereof. Still referring to FIGS. 8 and 9, the flange 122 is suitably four sided, wherein two sides 126, 127 thereof extend past the sides of the shaft 121 beneath the indentations 124. Preferably, as shown in FIG. 9, said extended sides 126, 127 are chamfered so that the flange 122 does not extend beyond the profile of the slug 110. It should be noted that, a preferable chamfer angle may be any angle that is oblique to the bottom surface of the nut wherein the flange 122 does not extend beyond the outside diameter of the slug 110 during its most most extreme transverse (side-to-side) float.

(19) The pins are shown in FIGS. 1 through 6, 8, and 9. As best seen in FIGS. 1, 6, and 8, the pins 130 are attached to the head 111 and foot 112 of the slug 110 by insertion through bores provided thereto. As best seen in FIG. 9, the pins 130 are preferably positioned (1) over the extended sides 126, 127 of the flange 122 and (2) adjacent said indentations 124. Although depicted as straight cylindrical pins 130, in an alternate embodiment of a barrel nut, the pins 130 may be bowed around the shaft 121 to increase the floating capabilities of the nut 120 (See FIG. 12). Although the indentations are shown on the shaft, in an alternate embodiment, the indentations may suitably be provided to the pins 130 so that the shaft is retained within the indentations of the pins.

(20) A preferable mode of construction may suitably be: (1) machine the slug 110 with at least a seat 113 that is situated between a head 111 and foot 112; (2) machine a nut 120 with at least a chamfered flange 122 and shaft 121; (3) obtain two pins; (4) locate the nut 120 on the seat 123 of the slug 110 between the head 111 and foot 112 so that the extended and chamfered sides 126, 127 of the flange 120 extend transverse to the length of the slug 110; and (5) affix the pins on the side of the slug 110 between the head 111 and foot 112 so that the pins 130 extend over the extended sides 126,127 of the nut's 120 flange 122. In an alternate embodiment of the barrel nut 100, wherein increased float (e.g., additional clearance between the nut 120 and the pins 130) is desired, such increase in float can be accomplished by any one or more of the following additional steps: (a) grind, machine or form a corresponding indentation 124 into each side of the shaft 121 of the nut 120 (or alternatively into the two pins 130) whereby additional distance is created between the relative edge of the pins 130 and the shaft 121 of the slug 110); or (b) bow or bend the pins outwardly away from the haft 121 of the nut 120. Said optional or additional steps may also be employed whenever the structural stability of the barrel nut 100 requires placement of the pins 130 at a location on the slug 110 that is more toward the seated nut 120 than the outer side of the slug 110.

(21) FIGS. 11A and 11B illustrate the following dimensions

(22) A: 0.5400.010 inch;

(23) B: 0.1050.010 inch (NAS requires greater than or equal to 0.0625 inch);

(24) C: 0.7500.010 inch;

(25) D: 0.68250.001 inch (diameter);

(26) E: 0.1560.005 inch;

(27) F: 0.1450.003 inch;

(28) G: 0.4150.005 inch;

(29) H: 0.4110.005 inch;

(30) I: 0.1450.003 inch (center of the pin 130 hole to the seat 113);

(31) J: 0.0630.001 inch (diameter);

(32) K: within the range of 0.0620.005 inch to 0.0967 inch (center of the pin 130 hole to the outermost periphery or outer diameter of the slug 110);

(33) L: within the range of 0.5550.001 inch to 0.5 inch;

(34) M: 0.5000.010 inch;

(35) N: 0.6200.010 inch;

(36) O: 0.5210.010 inch;

(37) P: 0.1000.003 inch;

(38) Q: 0.355+0.010/0.005 inch;

(39) R: crimp direction (for additional float); and,

(40) S: 0.37524 UNJF3B (Per AS8879) through hole, minor diameter 0.33440.3417 T/C minor 0.3390.003 inch.

(41) Those of skill in the art may know materials which are suitable for use in constructing barrel nuts according to the principles of this disclosure. Per NAS standards, alloy steel and Iconel may preferably be used for aerospace applications.

(42) It should be noted that the above description and recited embodiments or examples are of illustrative importance only. In other words, the descriptions of the present disclosure should not be construed as limiting of the subject matter in this application. Additional modifications may become apparent to one skilled in the art after reading this disclosure.