Electric heating – Heating devices – Combined with diverse-type art device
Patent
1990-11-13
1993-03-23
Bartis, Anthony
Electric heating
Heating devices
Combined with diverse-type art device
1231425E, 123549, 219200, 219201, 219206, 219523, 219544, 411395, 411411, H05B 340, F02N 1702, F16B 2300, F02M 3112
Patent
active
051966735
ABSTRACT:
A preheat device for preheating an internal combustion aircraft engine having an air intake pipe connected to a cylinder head by threaded mounting bolts is configured as a replacement bolt with a zinc - plated body having a bolt head and threaded shank. The body is made of steel heat treated to grade 8 hardness and tempered at apprximately 1,050 degrees F. and had an axial bore open at the head and extending toward and into the shank. An electric heating element surrounded by a stainless steel sheath is positioned in the bore. The shank has a thread with a flat root to provide a wall thickness approximately 0.060 inch. Each cylinder of the engine is provided with a preheat device in place of a mounting bolt and the preheat devices are connected to each other by a wiring harness connectable to an external power source. When energized the heating element of each preheat device generates heat that in transferred through the screw threads to the cylinder head of the engine cylinder.
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