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
editClinton Higbee invented and patented the blunt start thread in 1891.[2]
Common uses
editFire service
editThe 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
editGauging used to inspect machine threads often includes a Higbee cut.[5]
References
edit- ^ ASME B1.7-2006, Screw Threads: Nomenclature, Definitions, and Letter Symbols, The American Society of Mechanical Engineers, 2006-11-17, ISBN 0791830152
- ^ US 447775, Clinton A. Higbee, "Screw bolt and nut", issued 1891-03-10
- ^ "The Higbee Thread". Fire Engineering Magazine. Vol. 1895 16, no. 13. 1895-03-30. Archived from the original on 2021-03-05. Retrieved 2021-03-04.
- ^ Wildland Fire Hose Guide. United States Department of Agriculture: Forest Service. August 1995. p. 5.
{{cite book}}: CS1 maint: publisher ___location (link) - ^ "Internal Threads". Quality Magazine. 2013-01-13. Archived from the original on 2020-11-30. Retrieved 2021-03-04.