Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Externally threaded fastener element – e.g. – bolt – screw – etc. – Thread or shank structure
Patent
1979-08-22
1981-04-07
Britts, Ramon S.
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
Externally threaded fastener element, e.g., bolt, screw, etc.
Thread or shank structure
10152T, 411386, F16B 2500
Patent
active
042598893
ABSTRACT:
An improved thread tapping form is used to form an internal thread convolution in a member. The thread tapping form includes a plurality of projections which are disposed on a shank having a circular cross sectional configuration. Each of the thread forming projections includes a leading section which parts the material of the member to initiate formation of the flanks of the internal thread convolution. A side section of each thread forming projection presses against the flanks of the internal thread convolution to further form the flanks. A trailing section of each projection supports the side and leading sections of the projection.
REFERENCES:
patent: 1309232 (1919-07-01), Ahond
patent: 2183243 (1939-12-01), Meersteiner
patent: 3426642 (1969-02-01), Phipard, Jr.
patent: 4069730 (1978-01-01), Gutshall
Britts Ramon S.
The Lamson & Sessions Co.
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