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Adjustable End Die.
Patent for improvements to adjustable end dies. These improvements allow convenient rethreading of bolts while it is engaged with an object.
Date:
February 8, 1921
Creator:
Wright, John G.
System:
The Portal to Texas History
Windmill.
Patent for an improved windmill which allows for the conversion of "a rotating motion into a reciprocatory motion" (line 15-16) which allows the windmill to be "manufactured and sold at a comparatively low rate" (line 41-43).
Date:
February 8, 1921
Creator:
Cryer, Henry M.
System:
The Portal to Texas History
Wheel Tread.
Patent for wheel treads designed for heavy vehicles. The metal shoes on the tread are to help enable the vehicle to go over both hard and soft surfaces.
Date:
February 8, 1921
Creator:
Ingram, Joseph D.
System:
The Portal to Texas History
Motor- Driven Tire- Pump
Patent for Motor-Driven Tire Pump. Motor tire pump that helps inflate tires.
Date:
February 8, 1921
Creator:
Guthrey Gordon N.
System:
The Portal to Texas History
Trolley Wheel
Patent for an improved trolley wheel that has an intermediate trolley wire groove and spiral replacing grooves arranged on opposite sides of the intermediate groove so as to automatically return the trolley wire to the intermediate groove.
Date:
February 8, 1921
Creator:
Horton, Walter F. & Larson, Raymond G.
System:
The Portal to Texas History