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US Patent: 2,413,068
Diaphragm chuck
Patentee: Roger S. Pyne (exact or similar names) - Longmeadow, MA USPTO Classifications: 279/141, 279/156, 279/2.05, 279/2.11, 451/398 Tool Categories: metalworking machines : grinders : cylindrical grinders Assignees: Van Norman Co. - Springfield, MA Manufacturer: Van Norman Co. - Springfield, MA Witnesses: Unknown	Patent Dates: Applied: Feb. 14, 1945 Granted: Dec. 24, 1946 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Jeff Joslin Vintage Machinery entry for Van Norman Machine Tool Co.
Description: This chuck was primarily intended for holding ball-bearing inner races during grinding.

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