US 11,929,220 B2
Dual coil electric heating element
Stacy Springer, Murfreesboro, TN (US); Dan Maxwell, Murfreesboro, TN (US); Zachary Newcomb, Louisville, KY (US); Shahid Ikram, Goshen, KY (US); and Mitch Taylor, Prospect, KY (US)
Assigned to Backer EHP Inc., Murfreesboro, TN (US); and Wako (USA) Inc., Louisville, KY (US)
Filed by Backer EHP Inc., Murfreesboro, TN (US); and Wako (USA) Inc., Louisville, KY (US)
Filed on Feb. 13, 2023, as Appl. No. 18/168,344.
Application 18/168,344 is a continuation of application No. 16/682,757, filed on Nov. 13, 2019, granted, now 11,581,156.
Application 16/682,757 is a continuation in part of application No. 29/697,023, filed on Jul. 3, 2019, granted, now D955168, issued on Jun. 21, 2022.
Prior Publication US 2023/0197380 A1, Jun. 22, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. H01H 37/54 (2006.01); H05B 1/02 (2006.01); H01H 37/70 (2006.01)
CPC H01H 37/5409 (2013.01) [H05B 1/0266 (2013.01); H01H 2037/705 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An electric heating element, comprising:
an electrically resistive inner heating element including an inner coiled heating portion and first and second cold legs extending from and underneath the inner coiled heating portion for connection to an electrical power source;
an electrically resistive outer heating element including an outer coiled heating portion positioned in a common plane with and around the inner coiled heating portion, the inner and outer coiled heating portions defining a working surface for receiving a cooking utensil thereon, the outer heating element including third and fourth cold legs extending from and underneath the outer coiled heating portion for connection to the electrical power source, wherein
the third cold leg is positioned adjacent to and directly above the first cold leg and the second cold leg is positioned between the third and fourth cold legs, and
the inner heating element is electrically wired in parallel with the outer heating element, wherein first and second conductors extending from the respective first and second cold legs are electrically joined with respective third and fourth electrical conductors extending from the respective third and fourth electrical conductors, wherein the third and fourth electrical conductors are configured for engaging with an appliance electrical receptacle having a single pair of electrical conductor receiving ports;
a medallion positioned below the working surface and inside the inner coiled heating portion; and
a switch positioned in electrical series along the second cold leg and in proximity to the medallion, the switch configured to selectively open and close an electrical circuit to turn off and on the inner coiled heating portion.