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US Patent: 930,620
Combined breast-drill and valve-grinder
Patentee:
John R. Sandberg - Denver, CO

USPTO Classifications:
451/117, 74/112, 74/318, 74/320, 74/323, 74/423, 81/34

Tool Categories:
woodworking tools : hand drills : breast drills

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
G. Sargent Elliott
Adella M. Fowle

Patent Dates:
Applied: Aug. 21, 1908
Granted: Aug. 10, 1909

Patent Pictures:
Sandberg 930,620
USPTO pdf tiff
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Description:
John has designed a rather traditional style breast drill with a set of pawls. When one or the other of the pawls is engaged it gives the drill the reciprocal movement for valve grinding.

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