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US Patent: 612,239
Machine for dressing metals or other materials
Patentees:
Carl L. Grohmann (exact or similar names) - Hartford, CT
Lewis E. Harper (exact or similar names) - Hartford, CT

USPTO Classifications:
451/123, 451/227, 451/237, 82/19

Tool Categories:
specialty machines : bicycle machinery
metalworking machines : grinders

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
Richard F. Dow
Henry Bissell

Patent Dates:
Applied: Nov. 04, 1897
Granted: Oct. 11, 1898

Patent Pictures:
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Description:
This is "an improved and efficient machine...for dressing or grinding articles of various shapes...being particularly adapted for finishing work of irregular form. Our improved machine includes as one of its features a plurality of superposed slides supported for movement in different directions and independent patterns coöperative with and acting against the respective slides, the patterns being constructed to cause the tool, preferably mounted on the upper slide, to travel through a path conforming to the outline of the work to be dressed, and this path may follow straight, curvilinear, or other lines, in accordance with the patterns employed...The tool-carriage comprehends a plurality of superposed, slides, which may be five in number...the tool...in the present case is a grinding device for dressing off the interiors of cups or boxes for containing the bearing-balls of bicycles..."

See patent 612,412 for more on co-inventor Carl L. Grohmann.

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