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.
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190,223,982
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Jun. 04, 1903
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Improvement in chucks
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Lars Axel Nilsson |
, Sweden |
This is the "Grönkvist chuck", which was manufactured by the assignee and also by the Grönkvist Drill Chuck Co. of Jersey City, NJ. The Gronkvist chuck allowed bit changes without stopping the drill. See also US patent 848,566. |
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848,566
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Mar. 26, 1907
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Boring-chuck
|
Lars Axel Nilsson |
, Sweden |
This is the "Gronkvist chuck", which was manufactured by the Grönkvist Drill Chuck Co. of Jersey City, NJ. The Gronkvist chuck allowed bit changes without stopping the drill.
In 2020 we saw an offshore-manufactured stud extractor that used the same design principle: a trio of steel dowel pins held in slots in a cylindrical sleeve, all fitting within an outer casing, with ramps on the inside of the outer casing to force the pins against the workpiece as the workpiece rotates relative to the outer sleeve. |