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US Patent: 3,874,810
Drill guide
Patentee:
William D. Russell (exact or similar names) - Chula Vista, CA

USPTO Classifications:
408/110, 408/14, 408/99, D08/70

Tool Categories:
metalworking machines : drilling and boring

Assignees:
Portalign Tool Co. - San Diego, CA

Manufacturer:
Portalign Tool Co. - San Diego, CA

Witnesses:
Unknown

Patent Dates:
Applied: Jun. 21, 1973
Granted: Apr. 01, 1975

Patent Pictures:
USPTO (New site tip)
Google Patents
Report data errors or omissions to steward Jeff Joslin
Description:
The USPTO patent summary describes it as "A rugged, versatile drill guide of simple design for positioning a drill bit relative to varied workpiece configurations." The Portalign drill guide was manufactured for many years and was sold under Sears' Craftsman brand as their "Portalign precision drill guide". The originals are no longer made but imitations are still readily available, though of variable quality.

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