Spring devices – Fluid – Expansible-contractible chamber device
Patent
1992-02-10
1994-06-14
Larson, Lowell A.
Spring devices
Fluid
Expansible-contractible chamber device
29454, 72370, B21D 5112
Patent
active
053203313
ABSTRACT:
In a preferred embodiment, a method and apparatus for hydroforming thin-wall metal corrugated tubing which include first preforming the corrugated tubing in a conventional hydroforming operation of the type in which each convolution is formed separately. Semi-resilient spacers are then inserted between the sides of adjacent internal convolutions, while non-resilient washers are inserted between the sides of adjacent external convolutions. The corrugated tubing with the inserted spacers and washers is then highly compressed to the total thickness of the individual elements, with the spacers and washers controlling the radii formed at the crests and troughs of the convolutions. The resulting corrugated tubing has trough and crest radii on the order of 11/2 to 2 metal thicknesses, has an extension/compression ratio of 4 or greater, and can be compressed nearly flat. The sides of the convolutions are given a sine wave shape in cross-section to distribute stresses, so that they are not concentrated at the relatively sharp radii, and to eliminate noise when the corrugated tubing is flexed.
REFERENCES:
patent: 1983468 (1934-12-01), Knab
patent: 2044711 (1936-06-01), Mantle
patent: 2811173 (1957-10-01), Benson
patent: 3233632 (1966-02-01), Voitik
patent: 3277927 (1966-10-01), Schneider
patent: 4453304 (1984-06-01), Astill et al.
Crozier John H.
Larson Lowell A.
LandOfFree
Method and apparatus for forming corrugations in tubing and a co does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and apparatus for forming corrugations in tubing and a co, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for forming corrugations in tubing and a co will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1243024