Black Invention and Urban Transit Safety in Robert C. Dickenson’s Trolley Guard, 1919

Streetcar

Ephemera and pamphlets

Dickenson, Robert C. streetcar trolley guard blueprint, 1919, documents African American participation in early twentieth-century mechanical invention through a patented safety device for electric streetcar operation. Dickenson received U.S. Patent No. 1,314,130 for a trolley guard on August 26, 1919, placing this drawing within the patent system that governed authorship, mechanical innovation, and commercial claims to transportation technology. The blueprint documents patent-based engineering through a technical drawing with labeled components, revealing how an African American inventor translated a street railway safety problem into a manufacturable device, and providing primary-source evidence for the study of Black inventors, urban transit infrastructure, and industrial design after World War I.

Streetcar trolley guard blueprint. Robert C. Dickenson. Ohio, 1919. 28 x 16 inches. The drawing shows a trolley guard with precise white drafting lines on a deep blue ground, including labeled parts and annotations specifying materials and finishing instructions. Visible components include steel roller shaft, copper trolley, steel trolley holder, fork and bar pin, aluminum bracket, spring, and bolt. The patent described the device as using rollers mounted on opposite sides of a trolley wheel to engage the wheel flanges, indicating its intended role in keeping the trolley mechanism clear and protected during operation.

In 1920, Dickenson co-founded The Dickenson Trolley Guard Manufacturing Company with four partners and capitalization of $10,000, though no evidence supplied here confirms that the company manufactured the device. Provenance from the estate of his brother, jazz trombonist Vic Dickenson, adds a family association with African American cultural history while leaving the blueprint’s principal value in Black technical authorship and street railway safety. Minor edge wear and small central stain; drafting lines and annotations remain clear; very good. A visually detailed patent-era artifact documenting African American invention in early twentieth-century transportation technology.

Item #21603

Price: $450.00