초록 ▼

The invention relates to a threaded fastener. In particular, the invention relates to a threaded fastener such as a nut or a bolt. In an embodiment of the invention, a threaded fastener in the form of a nut (10) is disclosed. The nut comprises a main body portion (12); a lip portion (14) extending f

The invention relates to a threaded fastener. In particular, the invention relates to a threaded fastener such as a nut or a bolt. In an embodiment of the invention, a threaded fastener in the form of a nut (10) is disclosed. The nut comprises a main body portion (12); a lip portion (14) extending from the main body portion; and a recess (16) formed in the main body portion adjacent the lip portion. The recess is shaped to receive at least part of the deformable lip portion when a mating torque is applied to the fastener causing the deformable lip portion to deform. In this fashion, when the fastener is used to clamp two or more components together, such as flanges (20, 22) on adjacent pipe sections, the lip portion encounters a surface of the component that the fastener is being used to clamp against. As the fastener is torqued-up to a desired level, to provide a determined mating force, the lip portion is deformed into the recess in the main body portion.

대표청구항 ▼

1. A threaded fastener comprising: a main body portion;a deformable lip portion extending from the main body portion, the lip portion having radially outer and radially inner surfaces, wherein at least part of both the outer and inner surfaces is inclined relative to a longitudinal axis of the faste

1. A threaded fastener comprising: a main body portion;a deformable lip portion extending from the main body portion, the lip portion having radially outer and radially inner surfaces, wherein at least part of both the outer and inner surfaces is inclined relative to a longitudinal axis of the fastener; anda recess formed in the main body portion adjacent the lip portion, the recess shaped to receive at least part of the deformable lip portion when a mating torque is applied to the fastener causing the deformable lip portion to deform;wherein at least part of the inner surface of the lip portion is disposed parallel to the longitudinal axis of the fastener, and wherein a fold line is defined at a junction between the part of the inner surface disposed parallel to the fastener longitudinal axis and a part of the inner surface disposed inclined to the fastener longitudinal axis; andwherein parts of the main body portion located radially outwardly of the lip portion, relative to a longitudinal axis of the fastener, define at least one ramp connected to the lip portions, the at least one ramp being inclined relative to the longitudinal axis. 2. A fastener as claimed in claim 1, wherein the lip portion deforms into the recess on application of a determined mating force, the mating force determined by the mating torque applied to the fastener. 3. A fastener as claimed in claim 1, wherein the fastener is a nut having a threaded bore extending therethrough. 4. A fastener as claimed in claim 1, wherein the fastener is a bolt having a threaded shaft. 5. A fastener as claimed in claim 1, wherein the lip portion has an inclined surface, and wherein at least part of the lip portion surface is inclined towards a longitudinal axis of the fastener, such that the lip portion is encouraged to deform radially inwardly, relative to the longitudinal axis, when the fastener is torqued-up. 6. A fastener as claimed in claim 1, wherein the recess is provided radially inwardly of the lip portion. 7. A fastener as claimed in claim 1, wherein the lip portion is generally annular and extends in an unbroken ring around the fastener. 8. A fastener as claimed in claim 1, wherein the lip portion comprises a plurality of lip portion segments which together define the lip portion. 9. A fastener as claimed in claim 8, wherein the lip portion segments are located in abutment such that adjacent circumferential faces of the lip portions are in abutment. 10. A fastener as claimed in claim 1, wherein parts of the main body portion located radially outwardly of the lip portion, relative to a longitudinal axis of the fastener, define a plurality of ramps connected to the lip portions, the plurality of ramps being inclined relative to the longitudinal axis. 11. A fastener as claimed in claim 10, wherein the ramps are substantially inclined at 45° to the longitudinal axis. 12. A fastener as claimed in claim 11, wherein the ramps have arcuate surfaces. 13. A fastener as claimed in claim 1, wherein the lip portion is deformable from an extended position in which the lip portion extends from a surface of the main body portion, and a deformed position in which the lip portion is entirely received within the recess.