Engineering:Higbee cut
From HandWiki
Short description: Cut in a screw thread
A Higbee cut is a specific modification added to the end of a screw thread to create a blunt start, replacing the sharp end typically found on unmodified threads. Named after its inventor Clinton Higbee, this feature reduces the risk of cross-threading when applied to both male and female threads. A blunt-start thread with a Higbee cut is also referred to as a convoluted thread.[1]
History
Clinton Higbee invented and patented the blunt start thread in 1891.[2]
Common uses
Fire service
The Higbee cut is commonly used on the threads of fire hose couplings.[3] The cut's presence and the thread's starting point are often marked on couplings to facilitate proper assembly.[4]
Thread gauges
Gauging used to inspect machine threads often includes a Higbee cut.[5]
References
- ↑ ASME B1.7-2006, Screw Threads: Nomenclature, Definitions, and Letter Symbols, The American Society of Mechanical Engineers, 2006-11-17, ISBN 0791830152
- ↑ "Screw bolt and nut" US patent 447775, issued 1891-03-10
- ↑ "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.
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