Title: Electric motor device and heat sink and method of assembling

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Claims: I claim:

1. In an electric motor device of the type comprising a housing of a thermoplastic material having air inlet and outlet portions; a shaft in said housing; axially aligned bearing means in said housing journalling said shaft; fan means mounted on said shaft for moving air through said housing between said inlet and outlet portions for cooling the interior of said housing; the improvement in which at least one of said bearing means includes an apertured metal bearing heat sink, said heat sink having a first set of apertures for the passage of cooling air, said heat sink also having a second set of apertures; and pin means integral with said housing extending through said second set of apertures for mounting said heat sink in a fixed location, said pin means including an enlarged portion thereof in engagement with the surface of said heat sink about said second set of apertures.

2. The structure as claimed in claim 1 in which said heat sink includes a bearing in which one end of the shaft is journaled.

3. The structure as claimed in claim 1 in which said bearing heat sink includes a central bearing sleeve integral with outwardly projecting relatively thin heat conducting webs and defining passages therebetween which extend in the direction of said sleeve whereby ambient air moves axially past said sleeve.

4. The structure as claimed in claim 1 including a collar integral with and surrounding said sleeve; said housing including an apertured web into which said collar is telescoped.

5. The structure as claimed in claim 4 including apertured ear portions at one end of said collar, said housing having an integral web including said pin means having integral thermoplastic orienting pins projecting through said apertured ear portions, said pins being melted in overlying relation onto said ear portions and integrating said heat sink element with the web as a permanently mounted unit thereon.

Other info:

Inventors: Grieb, Dale Christian (Baltimore, MD, US)

Application Number: 515366
Filing Date: 1974-10-16
Publication_date: 1976-05-25
Assignee: The Black and Decker Manufacturing Company (Towson, MD)
Primary Class(es): 310/90 310/50, 310/62, 384/321
Other Classes:
US Patent Ref:

3252020	May, 1966	Consoli	308/77.
3546502	Dec, 1970	Botefuhr	308/77.
3699825	Oct, 1972	Misuraca	310/47.
3706483	Dec, 1972	Irwin	308/77.
3824684	Jul, 1974	Wheeler	310/50.
3831048	Aug, 1974	Wagner	310/90.
3873862	Mar, 1975	Butler	310/50.

Other Refs:
Primary Examiner: Skudy, R.
Assistant Examiner:
Attorney: Murphy; Edward D., Slotnik; Joseph R., Bloom; Leonard