Hollingsworth’s Patent Model of a Wind Engine - 1878

Description:

This model was filed with the application to the U.S. Patent Office for Patent Number 204,044 issued to Joseph Hollingsworth of Jonesborough, Indiana, on May 21, 1878.

Mr. Hollingsworth claimed a new and valuable improvement in windmills. His windmill invention was for the type known as vertical wind-wheels, the shaft of which is mounted vertically.

He claimed as new his design for a shield covering a portion of the wind-wheel which operated as a governor mechanism. The wind-wheel consisted of two circular plates with a series of curved blades sandwiched between them. The blades are painted red and can be seen in the image of the model. A wind passing across the blades would cause the wheel to rotate. Hollingsworth added a curved shield (shown in blue in front of the blades) that covered approximately 70 degrees of the circumference of the wheel. The shield was mounted on a rectangular frame that could rotate independently around the vertical axis of the wind-wheel.

Attached rigidly to that frame at an angle of about 35 degrees was a two-bladed vane (shown at the top of the image as having one blue and one red blade). In light winds the vane would align with the wind and result in the shield covering half of the blades of the wind-wheel, exposing the ones open to the wind and thus maximizing the wheel’s speed. The speed governor mechanism was associated with the two-bladed vane. The blue colored blade in the image is fixed, whereas the red blade is hinged so that as wind speed increases it would fold back against the fixed blade. A spring connecting the two controlled the amount of wind that could fold the blades. As the blades folded, the shield was rotated to cover more of the face of the wind-wheel thus reducing its speed.

The patent model is constructed of wood and metal. All of the key features of the invention are illustrated by the model to include the wind-wheel, shield and governor mechanism. Diagrams showing the complete design can be found in the patent document online (www.USPTO.gov).

Date Made: 1878Patent Date: 1878-05-21

Inventor: Hollingsworth, Joseph

Location: Currently not on view

Associated Place: United States: Indiana, Jonesborough

Subject: Patent ModelsWind energy

Subject:

See more items in: Work and Industry: Mechanical and Civil Engineering, Engineering, Building, and Architecture, Patent Models

Exhibition:

Exhibition Location:

Data Source: National Museum of American History

Id Number: MC.325667Catalog Number: 325667Accession Number: 249602Patent Number: 204,044

Object Name: windmill, modelpatent model, engine, wind

Measurements: overall: 12 3/4 in x 6 7/8 in x 8 5/8 in; 32.385 cm x 17.4625 cm x 21.9075 cmoverall - from catalog card: 4 1/2 in x 4 in; x 11.43 cm x 10.16 cm

Guid: http://n2t.net/ark:/65665/ng49ca746a6-9741-704b-e053-15f76fa0b4fa

Record Id: nmah_846965

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