Connected screw threads

Details Connected screw threads Connected screw threads

1990-06-14

1991-10-01

Wilson, Neill R.

Expanded, threaded, driven, headed, tool-deformed, or locked-thr

Headed fastener element with nut, washer, securing means or cap

Headed bolt or screw with threads and complementary nut

411423, 411436, F16B 3500

Patent

active

050528718

ABSTRACT:
A modified "Acme" type of male and female thread combination has a single-start male thread (10) of machined steel and a single-start female thread (12) of cast nodular graphite iron. The crown (20) of the female thread (12) is machined but the flanks (22, 22) and root (24) are left un-machined. There is plenty of clearance left between the crown (14) of the male thread (10) and the root (24) of the female thread (12). This reduces cost and yet the screw threads are adequate for use in a trench-box strut. The feed per revolution is 20 mm.

REFERENCES:
patent: 3150535 (1964-09-01), De Valliere
patent: 3216272 (1965-11-01), Suchocki
patent: 3603174 (1971-09-01), Patchen et al.
patent: 4512698 (1985-04-01), Muad

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