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.
|
489,811
|
Jan. 10, 1893
|
Traction Engine
|
Benjamin Holt |
Stockton, San Joaquin County, CA |
|
|
499,114
|
Jun. 06, 1893
|
Traction Engine
|
Benjamin Holt |
Stockton, San Joaquin County, CA |
Abstract:
My invention relates to improvements in io traction engines, and it consists in the attachment of a supplemental vertically adjustable frame, with supplemental traction wheels journaled therein exterior to the main frame and main traction wheels for the purpose of increasing the bearing surface on soft ground.
Claim:
In a traction engine, the main frame and bearing wheels upon which it is supported, in combination with supple mental frames hinged to the main frame and movable with relation thereto, and having supplemental wheels independently journaled therein whereby said wheels have a free vertical movement to conform to the irregularities of the ground surface, and means comprising a transverse connection below the main frame for connecting the supplemental frames with the main frame when the wheels of the latter sink into the surface whereby all the wheels act to support the mechanism. |
|
1,258,608
|
Mar. 05, 1918
|
Track-link construction
|
William Turnbull |
Stockton, CA |
The Holt Mfg. Co. originated the continuous-track tractor. Following a series of mergers and acquisitions, in 1925 changed their name to the Caterpillar Tractor Co. |