US Patent: 4,742,856 - Groove forming apparatus and method


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US Patent: 4,742,856

Groove forming apparatus and method

Patentees:

Kenneth L. Hehr (exact or similar names) - Ferndale, WA

Ronald J. Morgan (exact or similar names) - Bellingham, WA

USPTO Classifications:

144/136.95, 144/154.5, 144/353, 144/371, 144/84, 409/182

Tool Categories:

handheld power tools : handheld power tool accessories

woodworking machines : cutter head machines : routing machines

Assignees:

Thumbnail Co. - Bellingham, WA

Manufacturer:

Thumbnail Co. - Bellingham, WA

Thumbnail Co. - Cranbury, NJ

Nielsen & Bainbridge - Bridgeview, IL

Witnesses:

Unknown

Patent Dates:
Applied:	Jun. 26, 1987
Granted:	May 10, 1988

Patent Pictures:

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Google Patents
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Description:

This apparatus is intended for routing grooves in the mitered ends of picture frame members so that an H-shaped fastener can be used to hold the miter together. It was manufactured by the assignee firm; examples are marked with a sticker, "Thumbnail Ⓡ / Cranbury, NJ 08512 / TN 1000". In addition, the Thumbnail name and the patent number are cast in. We have also seen an example that appears to be later and is marked "Nielsen & Bainbridge" and "Thumbnailer".