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US Patent: RE4,019
Improvement in Curtain-Knobs
Patentee:
Calvin Z. Kroh - Tiffin, OH

USPTO Classifications:
24/694, 81/121.1

Tool Categories:
wrenches : auxiliary wrenches

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
R. J. Campbell
J. N. Campbell
E. R. Hays
H. C. Noble

Patent Dates:
Granted: Jun. 07, 1870

Reissue Information:
Reissue of 49,634 (Aug. 29, 1865)

Patent Pictures:
Calvin Z. Kroh reissue Pat. June 7, 1870
USPTO pdf tiff
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Description:
The improvement is a polygonal bearing surface between the knob and screw to allow the use of a "hollow screw-driver" or "bit-wrench" to install or remove the hardware. The "bit-wrench" is shown in the drawing.

This curtain knob is to fasten side-curtains on buggies, etc.

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