US Patent: 774,250
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| Repairable Attachment Plug
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Patentee:
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| Harvey Hubbell (exact or similar names) - Bridgeport, Fairfield County, CT |
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Patent Dates:
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| Applied: |
Feb. 26, 1903 |
| Granted: |
Nov. 08, 1904 |
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Patent Pictures:
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Joel Havens
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Description: |
| This patent was for the first electrical plug and socket and was the predecessor for all U.S. 120VAC plugs and wall sockets.
Abstract:
My invention has for its object to provide a separable attachment-plug in which the cost to of construction shall be reduced to the minimum and which shall do away with the possibility of arcing or sparking in making connection, so that electrical power in buildings may be utilized by persons having no electrical knowledge or skill in the use of tools in attaching lights, fans, motors, heating apparatus, surgical instruments, or any of the various appliances requiring the use of an electric current to fixtures in the circuit, the removable parts being interchangeable and one of said parts being connected to each light, group of lights, fan, or other appliance which it may be required to place in the circuit.
Claim:
A separable attachment-plug comprising an insulating -body having independent recesses, locking contact-springs in said recesses and independent guide-holes leading into said recesses, and a cap having contact-posts adapted to pass through the guide-holes and engage the locking contact-springs, the walls of said recesses and guide-holes closely surrounding the said contact-springs and extending beyond the ends thereof, whereby a connection can be established only upon the passage of the con tact-posts through the guide-holes and into the inner spaces constituting said recesses. |
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