Engineering:Higbee cut
From HandWiki
A Higbee cut is a specific cut added to a screw thread to produce a blunt start, instead of the sharp end of the unmodified screw thread. It is named for its inventor Clinton Higbee. The presence of a Higbee cut on both male and female threads eliminates the chance of cross threading. A blunt start thread possessing a Higbee cut is also known as a convoluted thread.[1]
Common Uses
Fire service
The Higbee cut is commonly used on fire hose couplings' threads.[2] The presence of the Higbee cut and the location of the start of the thread are often marked on couplings to assist with assembly.[3]
Thread gauges
Gauging used to inspect machine threads often includes a Higbee cut.[4]
History
Clinton Higbee invented and patented the blunt start thread in 1891.[5]
References
- ↑ ASME B1.7-2006, Screw Threads: Nomenclature, Definitions, and Letter Symbols, The American Society of Mechanical Engineers, 2006-11-17, ISBN 0791830152
- ↑ "The Higbee Thread". Fire Engineering Magazine 1895 16 (13). 1895-03-30. https://www.fireengineering.com/leadership/the-higbee-thread/. Retrieved 2021-03-04.
- ↑ Wildland Fire Hose Guide. United States Department of Agriculture: Forest Service. August 1995. p. 5.
- ↑ "Internal Threads". Quality Magazine. 2013-01-13. https://www.qualitymag.com/articles/90954-internal-threads. Retrieved 2021-03-04.
- ↑ "Screw bolt and nut" US patent 447775, issued 1891-03-10
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