Source: https://patents.google.com/patent/US7375277B1/en
Timestamp: 2018-10-20 18:25:41
Document Index: 395493681

Matched Legal Cases: ['art 26', 'art 28', 'art 26', 'art 28', 'art 26', 'arts 26', 'arts 26', 'art 52', 'art 58', 'art 52', 'arts 88', 'art 88', 'art 90', 'art 92', 'art 96']

US7375277B1 - Double flanged bushings and installation methods - Google Patents
Double flanged bushings and installation methods Download PDF
US7375277B1
US7375277B1 US09603857 US60385700A US7375277B1 US 7375277 B1 US7375277 B1 US 7375277B1 US 09603857 US09603857 US 09603857 US 60385700 A US60385700 A US 60385700A US 7375277 B1 US7375277 B1 US 7375277B1
US09603857
Jude H. Restis
Mark R. Weiss
It is known to secure a bushing within an opening in a structural wall by positioning the bushing-within the opening, holding it in place, and then forcing an expansion mandrel through the bushing to radially expand the bushing into an interference fit with the opening.
U.S. Pat. Nos. 3,835,688 and 3,949;535, and the other above-identified patents should be carefully considered for the purpose of putting the present invention into proper prospective relative to the prior art.
FIG. 5 is a view like FIGS. 2–4 showing a fourth two flanged bushing that is a part of the present invention;
FIG. 15 is a view like FIGS. 12–14, but showing a bushing of the type shown by FIG. 5;
FIGS. 2, 6–8 and 12 disclose a first embodiment of the double flanged bushings of the present invention. This bushing 25 is composed of a first bushing part 26 and a second bushing part 28. Bushing part 26 comprises a tubular section 30 and a radial flange section 32. Flange section 32 is connected to one end of the tubular section 30. Tubular section 26 extends axially and radial flange section 32 extends radially. Bushing part 28 is a radial member 34 that includes a center opening 36. Preferably, but not necessarily, the radial length of member 34 substantially equals the radial length of flange section 32 measured from the outside diameter of the tubular section 30.
FIGS. 6–8 show the bushing 28 in the process of being installed into the opening 38 in a work member 40, shown in the form of a structural wall 40. The tubular section 30 of bushing part 26 has an outside diameter substantially corresponding to the diameter of opening 38. Tubular section 30 has a length that is slightly longer than the length of the opening 38, so as to provide it with an end portion 42 that projects axially outwardly from the second wall 44 of the member 40 when the flange 32 is against the first wall 46 of the member 40. The opening 36 in member 34 has a diameter substantially corresponding to the outside diameter of end part tubular section 30. End portion 42 has a length substantially corresponding to the thickness of the member 34.
FIG. 8 shows the mandrel M fully retracted within the nose piece 14 of the puller 12. The end portion 25 of the mandrel M has been moved entirely through the tubular section 30. As a result, the puller 12 and mandrel M are freely movable away from the installed bushing 26, 28. FIG. 8 shows an axial space 48 starting to form between side surface 44 of member 40 and end surface 16 of nose piece 14. It further shows the bushing parts 26,28 installed within the opening 18. The installed bushing parts 26, 28, are also shown in FIG. 12, with the puller 12 having been moved away from the work member 40.
The opening 38 is formed and prepared in the manner described above. Primer may be applied to the inside of the opening 38. Sealant may be applied to the inside surfaces of the flanges 56, 62 of the bushing 50. The bushing 50 is installed in the following manner. The tubular section 54 of bushing part 52 is inserted into the opening 38 in the work member 40, from the first side of the work member 40. It is then pushed axially inwardly until the inner surface of flange section 56 contacts the side surface 46 on the work member 40. Then, the tubular section 60 of the bushing part 58 is installed into the opening in bushing section 54, from the second side of the work member. It is moved inwardly until the inner surface of flange section 62 contacts the sidewall 44 of work member 40. Next, as shown by FIG. 9, the mandrel M and puller 12 are used to radially and circumferentially expand the two tubular sections 54, 60. The mandrel M is installed in the manner described above in connection with FIGS. 6–8 and a lubricant is used between it and the bushing 50. It is then pulled axially into the puller 12 so as to move its enlarged end portion 24 axially through tubular section 60, as shown in FIG. 9. As it moves, the mandrel head 24 radially and circumferentially expands both tubular section 60 and tubular section 54. This expansion makes a tight interference fit between tubular section 54 and the sidewall of opening 38 and makes a tight interference fit of tubular section 60 within tubular section 54. This connects tubular portion 54 to the sidewall of opening 38 and connects tubular portion 60 to tubular portion 54. As can be seen from FIG. 9, movement of the mandrel M through the tubular section 54 applies a drag force on the bushing part 52 that pulls the flange section 56 into tight contact with the wall 46 of work member 40. The end surface 16 of nose piece 14 is pressed by reaction forces tightly against flange section 62, moving flange section 62 into tight engagement with sidewall 44 of work member 40.
FIGS. 5, 8 and 15 show a fourth embodiment of the bushing. This bushing 86 is composed of two bushing parts 88, 90, which are preferably identical in construction. Bushing part 88 has a tubular section 92 and a radial flange section 94 that is connected to one end of the tubular section 92. Bushing part 90 has a tubular section 96 and a radial flange section 98 that is connected to one end of the tubular section 96. The outside diameters of the tubular sections 92, 98 substantially conform to the diameter of the opening 38 in the work member 40. The tubular sections 92, 96 are both shorter than the opening 38 but, preferably, their combined lengths substantially equal the length of the opening 38 (FIG. 15). The tubular sections 92, 96 may have concentric end portions that form a lap joint where they meet. End part 92′ concentrically surrounds end part 96′.
The illustrated embodiments are only examples of; the present invention and, therefore, are non-limitive. It is to be understood that many changes in the particular structure, materials and features of the invention may be made without departing from the spirit and scope of the invention. Therefore, it is my intention that my patent rights not be limited by the particular embodiments illustrated and described herein, but rather determined by the following claims, interpreted according to accepted doctrines of claim interpretation, including use of the doctrine of equivalents and reversal of parts.
1. A dual bushing installation comprising:
an outer metal bushing comprising a first body having a first end, an opposite end, and prior to installation, the outer metal bushing includes a single radial flange, the first end and the opposite end connected by a circumferentially seamless outer surface having an outer circumference and a circumferentially seamless inner surface having an inner circumference, the circumferentially seamless inner surface adjacent a first opening that extends through the first body, the single radial flange of the outer bushing proximate the first end of the outer metal bushing;
an inner metal bushing comprising a second body having a first end, a second end, and prior to installation, the inner metal bushing includes a single radial flange, the first end and the second end connected by a circumferentially seamless outer surface having an outer circumference and a circumferentially seamless inner surface having an inner circumference, the circumferentially seamless inner surface of the inner bushing adjacent a second opening that extends through the second body, the single radial flange of the inner bushing proximate the second end of the inner metal bushing;
wherein the outer circumference of the inner metal bushing substantially conforms with the inner circumference of the outer metal bushing such that the inner metal bushing is closely received by the first opening of the outer metal bushing; and
wherein the inner metal bushing is rotationally and translationally fixed relative to the outer metal bushing because of a sufficient radial displacement initiated at the circumferentially seamless inner surface of the inner bushing, which provides a substantially equal, outwardly radial displacement throughout nearly all of a longitudinal length of the circumferentially seamless outer surface of the inner metal bushing and nearly all of a longitudinal length of the circumferentially seamless inner surface of the outer metal bushing such that substantially uniform stresses are provided along the longitudinal lengths of the inner bushing and the outer bushing.
2. The installation of claim 1 wherein the circumferences are diameters.
3. The installation of claim 1 wherein the dual-bushing installation kit is received in an opening of a structural work member.
4. The installation of claim 1 wherein the amount of radial displacement achieved at the circumferentially seamless outer surface of the outer metal bushing is dependent, in part, on the modulus of elasticity and the ultimate strength of the first and second metal bushings.
5. The installation of claim 1 wherein the first body and the second body are cylindrical and concentric with respect to one another.
6. The installation of claim 1, further comprising:
a solid metal structural wall having an opening extending between the single radial flange of the outer metal bushing and the single radial flange of the inner metal bushing, the entire circumferentially seamless outer surface of the outer metal bushing contacts all of a longitudinal length of a surface of the opening of the structural wall.
7. The installation of claim 1 wherein the inner circumference of the inner metal bushing is uniform along all of a longitudinal length of the circumferentially seamless inner surface of the inner metal bushing.
8. The installation of claim 1 wherein the entire circumferentially seamless inner surface of the inner metal bushing defines a passageway having a uniform axial cross-section throughout all of a longitudinal length of the circumferentially seamless inner surface of the inner metal bushing.
9. A dual bushing installation kit comprising:
a first metal bushing comprising a first body having first and second ends, the first and second ends connected by a first outer surface having a first outer circumference and a first inner surface having a first inner circumference, the first inner surface surrounding a first opening that extends through the first body;
a second metal bushing defined by a second body having first and second ends, the first and second ends connected by a second outer surface having a second outer circumference and a second inner surface having a second inner circumference, the second inner surface surrounding a second opening that extends through the second body;
wherein the second outer circumference dimensioned to be substantially conforming with the first inner circumference such that the second bushing is closely receivable by the first opening of the first bushing;
wherein sufficient radial displacement initiated at the second inner surface of the second body results in substantially equal displacement of both the second outer circumference and the first inner circumference in an outwardly radial direction; and
wherein the first body and the second body are elliptical, the first inner surface of the first bushing having a first elliptical profile that substantially conforms to a second elliptical profile defined by the second outer surface of the second bushing.
10. A radially, cold-expandable, dual bushing assembly comprising:
an outer metal bushing comprising a first body having a first end, an opposite end, and prior to installation, the outer metal bushing includes only one radial flange, the first end and the opposite end connected by a first circumferentially seamless outer surface and a first circumferentially seamless inner surface, the first circumferentially seamless inner surface adjacent a first opening that extends through the first body, the only one radial flange of the outer bushing proximate the first end of the outer metal bushing;
an inner metal bushing comprising a second body having a first end, a second end, and prior to installation, the inner metal bushing includes only one radial flange, the first end and the second end connected by a second circumferentially seamless outer surface and a second circumferentially seamless inner surface, the second circumferentially seamless inner surface adjacent an opening that extends through the second body, the only one radial flange of the inner bushing proximate the second end of the inner metal bushing;
wherein the second circumferentially seamless outer surface of the inner metal bushing is received in and substantially conforms with the first circumferentially seamless inner surface of the outer metal bushing;
wherein the inner and outer bushings are radially expanded by a like amount because of the second circumferentially seamless inner surface of the second body being radially displaced; and
wherein compressive stresses are developed in the inner metal bushing, the outer metal bushing, and in an area of a work member that receives the outer metal bushing because of the second circumferentially seamless inner surface of the second body being radially displaced, the compressive stresses being sufficient to increase the fatigue life of the work member.
11. The assembly of claim 10 wherein an amount of radial displacement of the second circumferentially seamless outer surface of the second metal bushing depends, in part, on the modulus of elasticity and the ultimate strength of the first and second metal bushings.
12. The assembly of claim 10 wherein the first body and the second body are cylindrical and concentric with respect to one another.
13. The assembly of claim 10 wherein the compressive stresses are substantial uniform along nearly all of a longitudinal length of the inner bushing and nearly all of a longitudinal length of the outer bushing.
14. A radially, cold-expandable, dual bushing assembly comprising:
a first, non-expanded, metal bushing defined by a first body having first and second ends, the first and second ends connected by a first outer surface and a first inner surface, the first inner surface surrounding a first opening that extends through the first body;
a second, non-expanded, metal bushing defined by a second body having first and second ends, the first and second ends connected by a second outer surface and a second inner surface, the second inner surface surrounding an opening that extends through the second body;
wherein the bushings in their non-expanded state provide for the second outer circumference dimensioned to be substantially conforming with the first inner circumference such that the second bushing is closely insertable into the first opening of the first bushing;
wherein the non-expanded bushing assembly is capable of substantially equal displacement of both the second outer circumference and the first inner circumference in an outwardly radial direction when a radial displacement is initiated at the second inner surface of the second body;
wherein compressive stresses are developed in the first bushing and compressive stresses are further developed in an area of a work member that is contiguous with and substantially surrounding the first bushing when the radial displacement is initiated at the second inner surface of the second body, the compressive stresses being sufficient to increase the fatigue life of the work member; and
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Owner name: FATIGUE TECHNOLOGY INC., WASHINGTON
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:SKINNER, WILLIAM A.;RESTIS, JUDE H.;WEISS, MARK;REEL/FRAME:011090/0089