Method for manufacturing bottom valve seat

Details Method for manufacturing bottom valve seat Method for manufacturing bottom valve seat

1976-09-10

1978-01-31

Larson, Lowell A.

Metal deforming

With cutting

By shearing tool-couple

72336, 291567A, B21D 5310

Patent

active

040708950

ABSTRACT:
A method for manufacturing a bottom valve seat for use in a hydraulic damper is provided including the steps of: punching out a circular blank from a flat plate of a given thickness to prepare a circular blank having given dimensions; drawing the blank into a cup-shaped work having a circumferential flange portion; forming a cylindrical wall in the cup-shaped work thus provided, with the wall having a given length; and pressing the central portion of a bottom portion of the cup-shaped work downwards or internally, thereby forming an annular flat portion along the circumferential edge of the bottom portion; cutting the flange portion into given dimensions; and punching a through hole in the flange portion. In this bottom valve seat, the flange portion has a flat surface and at least one oil passage is provided in the portion of the valve seat, which is opposite to the bottom portion.

REFERENCES:
patent: 2305064 (1942-12-01), Colwell, et al.
patent: 3057042 (1962-10-01), Lawson
patent: 3785029 (1974-01-01), McClellan et al.

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