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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2,885,901
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May. 12, 1959
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Machine Tool Feed Mechanism
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Arthur J. Firth |
, England |
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1,190,810
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May. 06, 1970
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Improvements in or Relating to Gear Systems Through Which a Shaft is Driven
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Arthur Jose Firth |
, England |
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3,765,259
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Oct. 16, 1973
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Forward and Reverse Drive Mechanism for a Machine Tool
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Arthur Jose Firth |
, England |
Abstract
Particularly for feeding the quill of a milling machine, a forward and reverse drive mechanism having a neutral (non-drive) position, including a gear on the drive shaft selectively engageable by one of two other gears disposed one on each side of the drive shaft gear, each other gear being carried by a lay shaft one or both of which drives a driven shaft and if only one lay shaft drives the driven shaft, that lay shaft is driven by the other lay shaft through an idler gear.
U.S. Patent Documents
1,834,716 December 1931 Kis
2,340,679 February 1944 Moore
2,426,299 August 1947 Dyer
3,621,730 November 1971 Jennings
Foreign Patent Documents
474,535 Jun 1951
1,041,190 Sep 1966 |