If you find a patent number or patent date by this manufacturer that is not on this
list, please contact the Site Historian.
Key to Links for Patent Information
USPTO = U.S. Patent Office .
Images of the actual patent can be viewed on the U.S. Patent Office web site but
a special TIFF viewer must be installed with your browser in order properly work.
More information on how to configure your computer to view these patents can be
found at TIFF image Viewers
for Patent Images.
DATAMP = Directory of American Tool And
Machinery Patents . A sister site to VintageMachinery.org with information
on patents related to machinery and tools. A much easier user interface than the
USPTO's for finding information on machinery patents.
|
1,830,679
|
Nov. 03, 1931
|
Drill spindle
|
Charles F. Schenck |
Toledo, OH |
The assignee acquired drilling machine maker Demco Machine Tool Co. in the early 1930s; the spindle bearing arrangement in the patent was presumably used on the assignee's "Demco" brand drill presses. |
|
1,972,359
|
Sep. 04, 1934
|
Feed mechanism for tool-carrying spindles
|
Charles F. Schenck |
Toledo, OH |
The assignee acquired drilling machine maker Demco Machine Tool Co. in the early 1930s; the spindle speed mechanism in the patent was presumably used on the assignee's "Demco" brand drill presses. |
|
2,189,422
|
Feb. 06, 1940
|
Combined drilling and tapping machine
|
George W. Irwin |
Holland, OH |
The assignee acquired drilling machine maker Demco Machine Tool Co. in the early 1930s; the drilling machine in the patent was sold under the "Demco" brand. |
|
2,267,238
|
Dec. 23, 1941
|
Drill press driving mechanism
|
George W. Irwin |
Holland, OH |
The assignee acquired drilling machine maker Demco Machine Tool Co. in the early 1930s; the variable-speed mechanism in the patent was presumably used on the assignee's "Demco" brand drill presses. |