Manufacture of grease fittings and blanks therefor
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United States of America Patent
Stats
-
May 25, 1999
Grant Date -
N/A
app pub date -
Feb 15, 1996
filing date -
Feb 15, 1996
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A grease fitting is made by forming its outer shell in a series of cold forging steps to make a blank with the necessary thread blank at one end, a hexagonal center portion, and with a grease-fitting-mating nipple outline at the other end. Threads are rolled onto the thread blank, and the grease-gun-mating nipple is rolled to smooth and burnish its surface. The grease fitting is then successively drilled to make a hole of three different diameters to form the one-way valve ball seat and two ball spring clearance diameters. The ball and spring are inserted, and the end of the hole is formed over the end of the spring to capture the spring into place.
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