US Patent No. 10,437,217

IRRIGATION CONTROLLER WITH ROBUST GROUND PATH


Patent No. 10,437,217
Issue Date October 08, 2019
Title Irrigation Controller With Robust Ground Path
Inventorship Richard C. Stange, Oceanside, CA (US)
David M. Hurrle, Encinitas, CA (US)
Kok Huat Chong, San Diego, CA (US)
Assignee Hunter Industries, Inc., San Marcos, CA (US)

Claim of US Patent No. 10,437,217

1. An irrigation controller comprising:a housing;
a backplane mounted in the housing; and
at least one module removably mountable on the backplane, the at least one module including:
a circuit board having at least one conductor;
a top cover positioned on a first side of the circuit board, the top cover having a first aperture therethrough and a wall at least partially surrounding the first aperture, the wall having a first end and a second end between the first end and the circuit board;
at least one electrically conductive screw comprising a head portion and an elongate portion extending from the head portion, the at least one electrically conductive screw extending through the first aperture of the top cover and configured to secure the at least one module to the backplane and establish a first portion of a ground path from the head portion through the backplane when the at least one electrically conductive screw is tightened; and
a bushing extending completely through the first aperture in the top cover such that a first end of the bushing is positioned between the head portion of the at least one electrically conductive screw and the first end of the wall and a second end of the bushing is positioned between the at least one conductor and the first end of the wall;
wherein the bushing is configured to establish a second portion of the ground path from the at least one conductor on the circuit board to the head portion and inhibit compression of the top cover when the at least one electrically conductive screw is tightened,
wherein the at least one conductor is configured to shunt a power surge to the bushing so as to protect operational components of the at least one module.