Metal working – Method of mechanical manufacture – Electrical device making
Patent
1989-02-22
1991-08-13
Echols, P. W.
Metal working
Method of mechanical manufacture
Electrical device making
29611, 29621, 57 18, 219549, H05B 300, G01R 2700
Patent
active
050384589
ABSTRACT:
A flexible elongated resistance heating element of improved uniformity and ease of termination has a continuous strip of resistance wire formed about a flexible elongated strand of insulating material in a generally helical pattern of nonuniform pitch with regions of increased pitch and correspondingly reduced turns density which regions experience little increase in temperature when the element is energized. The pitch of the helical resistance wire pattern varies as it approaches each of the ends of the element to provide a region of increased pitch followed by a region of decreased pitch at each end. Shorting wires may thereby be eliminated. An insulating coating surrounds the resistance wire and strand and electrical terminals are connected by crimping to the regions of decreased pitch of the resistance wire at the ends. The heating element may be bonded to a support member in a serpentine pattern with the cool end regions extending freely from the support member. Intermediate regions of increased pitch may be provided in portions of the heating element when it is desired to have those regions experience reduced heating. A method of fabricating such a heating element is also disclosed.
REFERENCES:
patent: 1600826 (1926-09-01), Langos
patent: 1855876 (1932-04-01), Barker
patent: 2053933 (1936-09-01), Abbott
patent: 2247869 (1941-07-01), Beers
patent: 3280452 (1966-10-01), Merritt
patent: 3493017 (1970-02-01), Govaery
patent: 3512350 (1970-05-01), Lukas
patent: 3724190 (1973-04-01), Balbatun et al.
Nimtz Steven M.
Wagoner Mervin W.
Echols P. W.
Heaters Engineering, Inc.
Rickert Roger M.
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