Title: Carbon brush assembly

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Claims: Having thus described the invention, what is claimed as new and desired to be secured by Letters patent is

1. An electrical brush assembly comprising:

a brush of electrically conductive material having a mounting projection; and

a helical compression spring attached to said brush,

said spring comprising a single, spiralled strand of material formed into a first longitudinal series of outer turns of one diameter which defines an elongated cylindrical space within said turns extending from one end of said first series to the opposite end thereof,

said strand further being formed into a second series of inner turns smaller in diameter than said outer turns which securely receives said projection inside said cylindrical space at all times, whether the spring is compressed or uncompressed,

said inner turns of the single strand being integrally joined to the outer turns, being disposed wholly within said space, and extending from said one end of the first series toward the opposite end thereof.

2. An electrical brush assembly as claimed in claim 1, wherein said outer turns spiral in one axial direction and said inner turns spiral in the opposite axial direction.

3. An electrical brush assembly as claimed in claim 1, wherein said spring is constructed from an electrically conductive material.

4. An electrical brush assembly as claimed in claim 1, wherein said inner turns are closely spaced about said projection.

5. An electrical brush assembly as claimed in claim 1, wherein said projection has an outermost end, said series of inner turns having a transversely extending mounting leg lying against said end of the projection.

6. An electrical brush assembly as claimed in claim 1, wherein said projection and said turns are concentric with one another.

Other info:

Inventors: Dupuis, Maurice Victor (Raytown, MO, US)
Hohman, Frederick William (Spring Lake, MI, US)

Application Number: 419651
Filing Date: 1973-11-28
Publication_date: 1976-07-20
Assignee:
Primary Class(es): 310/245
Other Classes:
US Patent Ref:

1933628	Nov, 1933	Kitto	310/247.
2045293	Jun, 1936	Carlson	310/245.
2428250	Sep, 1947	Thomas	310/248.
2430279	Nov, 1947	Duryee	310/247.
2454909	Nov, 1948	Bylund	310/247.
2477352	Jul, 1949	Stark	310/247.
2482921	Sep, 1949	Malchus	310/247.
2536958	Jan, 1951	Rudat	310/247.
2748302	May, 1956	Boeckel	310/247.
2813208	Nov, 1957	Ritter	310/247.
2870355	Jan, 1959	Rohrbach	310/247.
2889530	Jun, 1959	Straub	310/247.
2987639	Jun, 1961	Bayless	310/247.
2991379	Jul, 1961	Van Dam	310/247.
3431446	Mar, 1969	Petersen	310/247.

Other Refs: 834,902

May, 1960	UK

Primary Examiner: Skudy, R.
Assistant Examiner:
Attorney: Schmidt, Johnson, Hovey & Williams