A preload indicating washer assembly that operates in the elastic region for a rated compression is disclosed. Because it operates in the elastic region, the preload indicating washer assembly resumes its original shape when the compression is decreased or removed. The washer assembly elastically de
A preload indicating washer assembly that operates in the elastic region for a rated compression is disclosed. Because it operates in the elastic region, the preload indicating washer assembly resumes its original shape when the compression is decreased or removed. The washer assembly elastically deforms again to the same extent as its original deformation when the predetermined compression is restored. Thus the washer assembly will indicate the proper fastener preload when used for multiple loading cycles or in multiple locations.
대표청구항▼
What is claimed is: 1. An apparatus for use with a first member and for use in indicating a first compression of a predetermined value and a second compression of the predetermined value, said first member having a first member inner surface defining a first member aperture adapted to receive an el
What is claimed is: 1. An apparatus for use with a first member and for use in indicating a first compression of a predetermined value and a second compression of the predetermined value, said first member having a first member inner surface defining a first member aperture adapted to receive an elongated member, said first member further having a first member axial height, said apparatus comprising: a second member having a second member inner surface defining a second member aperture adapted to receive the elongated member, said second member further having a second member outer surface and a second member axial height that is greater than the first member axial height; wherein at least a portion of said second member is adapted to fit within the first member aperture so that at least a portion of the first member inner surface is adjacent to at least a portion of the second member outer surface when the second member is under no compression; wherein the first member is adapted for at least partial rotation around the elongated member and the second member when the at least a portion of the first member inner surface is adjacent to the at least a portion of the second member outer surface and when the second member is under no compression; wherein the second member is constructed of a material that is adapted to deform elastically when the second member is compressed by a force equal to the predetermined value, and wherein the apparatus reuseable for indicating the second compression of the predetermined value. 2. The apparatus of claim 1 wherein the second member is constructed of nitinol. 3. The apparatus of claim 1 wherein the first member further has a first member outer surface and a lug extending from the first member outer surface. 4. The apparatus of claim 1 wherein the apparatus is further for use with an actuator and wherein the first member further has a first member outer surface defining a bore adapted to receive the actuator. 5. The apparatus of claim 1 wherein the first member further has a first member outer surface having a plurality of knurls. 6. The apparatus of claim 1, wherein the apparatus is further for use with a third member defining a third member aperture and adapted to mate with the elongated member, and for use with a fourth member defining a fourth member aperture and adapted to mate with the elongated member, wherein the second member has a proximate side and a distal side, each of said proximate and distal sides connecting the second member inner surface with the second member outer surface, and wherein the third member is adapted to abut one of the second member proximate and distal sides and the fourth member is adapted to abut the other of the second member proximate and distal sides when the first and second members are mated with the elongated member, when the at least a portion of the first member inner surface is adjacent to the at least a portion of the second member outer surface, and when the second member is compressed by the force equal to the predetermined value. 7. An apparatus for use with a generally ring-shaped first member and for use in indicating a first compression of a predetermined value and a second compression of the predetermined value, said generally ring-shaped first member having a generally cylindrically-shaped first member inner surface defined by a first member inner diameter and being adapted to mate with an elongated member, said first member further having a first member axial height, said apparatus comprising: a generally ring-shaped second member having a generally cylindrically-shaped second member outer surface defined by a second member outer diameter that is less than the first member inner diameter when the second member is under no compression, said second member being adapted to mate with the elongated member and having a second member axial height that is greater than the first member axial height; wherein at least a portion of the first member inner surface is adapted to surround at least a portion of the second member outer surface when the second member is under no compression; wherein the first member is adapted for at least partial rotation around the elongated member and the second member when the at least a portion of the first member inner surface surrounds the at least a portion of the second member outer surface and when the second member is under no compression; wherein the second member is constructed of a material that is adapted to deform elastically when the second member is compressed by a force equal to the predetermined value, and wherein the apparatus reusable for indicating the second compression of the predetermined value. 8. The apparatus of claim 7 wherein the second member is constructed of nitinol. 9. The apparatus of claim 7 wherein the first member further has a first member outer surface and a lug extending from the first member outer surface. 10. The apparatus of claim 7 wherein the apparatus is further for use with an actuator and wherein the first member further has a first member outer surface defining a bore adapted to receive the actuator. 11. The apparatus of claim 7 wherein the first member further has a first member outer surface having a plurality of knurls. 12. The apparatus of claim 7, wherein the apparatus is further for use with a third member defining a third member aperture and adapted to mate with the elongated member, and for use with a fourth member defining a fourth member aperture and adapted to mate with the elongated member, wherein the second member has a second member inner surface, and wherein the second member further has a proximate side and a distal side, each of said proximate and distal sides connecting the second member inner surface with the second member outer surface, and wherein the third member is adapted to abut one of the second member proximate and distal sides and the fourth member is adapted to abut the other of the second member proximate and distal sides when the first and second members are mated with the elongated member, when the at least a portion of the first member inner surface is adjacent to the at least a portion of the second member outer surface, and when the second member is compressed by the force equal to the predetermined value. 13. The apparatus of claim 12 wherein the first and second members are rings, wherein the third and fourth members are washers, and wherein the elongated member is one of a bolt and an externally-threaded stud. 14. A method of applying a compression of a predetermined value using a generally ring-shaped first member having a generally cylindrically-shaped inner surface, and using a generally ring-shaped second member having a generally cylindrically-shaped outer surface, said second member being constructed of a material that is adapted to deform elastically but not plastically when compressed by a force equal to the predetermined value, the method comprising the steps of: mating the first and second members with an elongated member so that at least a portion of the first member inner surface surrounds at least a portion of the second member outer surface; applying a first compression on the second member, said first compression being of a first value that is less than the predetermined value; rotating the first member at least partially around the elongated member when the second member is under the first compression; and applying a second compression on the second member, said second compression being of the predetermined value, thereby causing an elastic but not plastic deformation of the second member; and applying a rotational force on the first member. 15. The method of claim 14 further comprising the steps of: reducing the second compression on the second member from the predetermined value to a second value; rotating the first member at least partially around the elongated member when the second member is under the second compression of the second value; and applying a third compression on the second member, said third compression being of the predetermined value, thereby causing an elastic deformation of the second member. 16. The method of claim 14 further comprising the steps of: removing the second compression from the second member; applying a third compression on the second member, said third compression being of a second value that is less than the predetermined value; rotating the first member at least partially around the elongated member when the second member is under the third compression; and applying a fourth compression on the second member, said fourth compression being of the predetermined value, thereby causing an elastic deformation of the second member. 17. The method of claim 14 wherein the second member is constructed of nitinol. 18. The method of claim 14 wherein the first and second members are rings and wherein the elongated member is one of a bolt and an externally-threaded stud. 19. An apparatus for use with a first member and for use in indicating a first compression of a predetermined value exerted on a surface and a second compression of the predetermined value exerted on the surface, said first member having a first member inner surface defining a first member aperture, wherein said first member is adapted to mate with an elongated member extending from the surface and to at least partially rotate around the elongated member, said apparatus comprising: means for repeatedly inhibiting the at least partial rotation of the first member around the elongated member when an amount of compression exerted on the surface is equal to the predetermined value, wherein said inhibiting means includes a second member adapted to mate with the elongated member and constructed of a material that is adapted to deform elastically when compressed by an amount equal to the predetermined value, and wherein the apparatus reusable for indicating the second compression of the predetermined value.
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이 특허에 인용된 특허 (3)
Trungold Emanuel H. (14B Broun Pl. Bronx NY 10475), Apparatus and method for measuring bolt tension in situ.
Boehringer John R. (427 Parkview Drive Wynnewood PA 19096) Lecky John (501 Shortridge Ave. Wynnewood PA 19096), Sealable activated charcoal gas sampler.
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