# US 7,744,400 B2 · Electrical cord locking connector > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 7,744,400 B2 - Document ID: US7744400B2 - Status: Granted - Kind: B2 - Application number: 12/156,244 - Filed: 2008-05-30 - Published: 2009-08-20 - Granted: 2010-06-29 - Earliest claimed: 2008-02-14 - Assignees: R C Design & Engineering Incorporated - Inventors: Richard A. Carmitchel - Web page: https://patentgrep.com/patent/US7744400B2 ## CPC - H01R 24/22: with additional earth or shield contacts - H01R 13/6275: {Latching arms not integral with the housing (H01R13/6276, H01R13/6277, H01R13/6278 take precedence)} - H01R 13/6392: {for extension cord} - H01R 13/652: with earth pin, blade or socket - H01R 24/30: with additional earth or shield contacts - H01R 2103/00: Two poles - H01R: ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS ## Abstract An electrical cord locking connector joins electrical cords in series and presents a streamlined profile that minimizes interference in restricted spaces through which the cords must be fed to service a job site. The connector joins the ends of successive cords utilizing the outwardly projecting shoulder provided on the female socket of one cord in cooperation with a latch member on the male end of the connecting cord to lock the two cords together. A cord provided with a female end terminating in a replacement cord cap is provided with a socket presenting a generally circular face and an outwardly projecting shoulder at the face for engaging a releasable latch member of a mating plug, thereby preventing separation of the plug and socket under force until the latch member is disengaged. ## Claims ### Claim 1 An electrical cord locking connector comprising: first and second electrical cords, each having a pair of current-carrying conductors and a grounding conductor, said first cord having an end provided with a plug having a pair of prongs connected to respective current-carrying conductors, and a third prong connected to the grounding conductor thereof, said second cord having an end provided with a socket presenting a face having at least three openings therein for receiving corresponding prongs of said first cord, said socket having an outwardly projecting shoulder adjacent said face engageable by said third prong for preventing improper mating of said prongs and openings if the prongs and openings are improperly aligned, and said plug having a releasable latch member projecting therefrom and engaging said shoulder when the plug and socket are properly mated to prevent separation of the plug and socket during use of the cords. ### Claim 2 (depends on 1) The connector as claimed in claim 1, wherein said latch member comprises a plate element having an opening therein for receiving said shoulder when the plug and socket are mated. ### Claim 3 (depends on 2) The connector as claimed in claim 2, wherein said plate element is composed of a resilient material permitting the element to flex as the plug and socket are mated to clear said shoulder until the opening registers therewith. ### Claim 4 (depends on 2) The connector as claimed in claim 2, wherein said plate element is elongated and flexible and has inner and outer end portions, said outer end portion having said opening therein, said inner end portion being secured to said plug, whereby the plate element is flexed as the cords are connected and shifts to a locking position receiving the shoulder when the opening registers with the shoulder. ### Claim 5 (depends on 2) The connector as claimed in claim 2, wherein said plate element has a generally T-shaped configuration and presents a head having said opening therein for receiving said shoulder, and a stem portion secured to said plug. ### Claim 6 (depends on 5) The connector as claimed in claim 5, further comprising a self-tapping screw securing said stem portion to said plug. ### Claim 7 (depends on 1) The connector as claimed in claim 1, wherein said latch member has a lip for engaging said shoulder when the plug and the socket are mated. ### Claim 8 (depends on 1) The connector as claimed in claim 1, wherein said socket has a generally circular face presenting said openings, said shoulder projecting outwardly from said face between two of said openings connected to respective current-carrying conductors and from a side of said socket opposite said grounding conductor. ### Claim 9 An electrical connector comprising: first and second electrical connecting devices, each having at least a pair of current-carrying conductors, said first device having an end provided with a plug having at least two prongs, said second device having an end provided with a socket having at least two openings therein for receiving corresponding prongs of said first device, said socket having a laterally outwardly projecting shoulder coextensive with said face for preventing improper mating of said prongs and openings, and said plug having a releasable latch member projecting therefrom and engaging said shoulder when the plug and socket are mated to prevent separation of the plug and socket during use. ### Claim 10 (depends on 9) The connector as claimed in claim 9, wherein said latch member comprises a plate element having an opening therein for receiving said shoulder when the plug and socket are mated. ### Claim 11 (depends on 10) The connector as claimed in claim 10, wherein said plate element is composed of a resilient material permitting the element to flex as the plug and socket are mated to clear said shoulder until the opening registers therewith. ### Claim 12 (depends on 10) The connector as claimed in claim 10, wherein said plate element is elongated and flexible and has inner and outer end portions, said outer end portion having said opening therein, said inner end portion being secured to said plug, whereby the plate element is flexed as the devices are connected and shifts to a locking position receiving the shoulder when the opening registers with the shoulder. ### Claim 13 (depends on 10) The connector as claimed in claim 10, wherein said plate element has a generally T-shaped configuration and presents a head having said opening therein for receiving said shoulder, and a stem portion secured to said plug. ### Claim 14 (depends on 13) The connector as claimed in claim 13, further comprising a self-tapping screw securing said stem portion to said plug. ### Claim 15 (depends on 9) The connector as claimed in claim 9, wherein said latch member has a lip for engaging said shoulder when the plug and the socket are mated. ### Claim 16 A replacement cord cap assembly comprising: first and second electrical connecting devices, each having at least a pair of current-carrying conductive elements and a grounding conductor, said first device having an end presenting a plug having first and second prongs connected with respective current-carrying elements thereof, and a third prong connected with said grounding conductor thereof, said second device having an end provided with a socket presenting a generally circular face and having at least three openings therein for receiving corresponding prongs of said first device, a pair of said openings being presented by respective current-carrying elements of said second device, said socket having a laterally outwardly projecting shoulder coextensive with said face adjacent said pair of openings, and said plug having a releasable latch member projecting therefrom and engaging said shoulder when the plug and socket are mated, thereby preventing separation of the plug and socket under force until the latch member is disengaged. ### Claim 17 (depends on 16) The replacement cord cap assembly as claimed in claim 16, wherein said latch member comprises a plate element having an opening therein for receiving said shoulder when the plug and socket are mated. ### Claim 18 (depends on 17) The replacement cord cap assembly as claimed in claim 17, wherein said plate element is composed of a resilient material permitting the element to flex as the plug and socket are mated to clear said shoulder until the opening registers therewith. ### Claim 19 An electrical cord locking connector comprising: first and second electrical cords, each having a pair of current-carrying conductors and a grounding conductor, said first cord having an end provided with a plug having at least three prongs, one of which is connected to the grounding conductor thereof, said second cord having an end provided with a socket having at least three openings therein for receiving corresponding prongs of said first cord, said socket having a generally circular face presenting said openings, and an outwardly projecting shoulder for preventing improper mating of said prongs and said openings, said plug having a releasable latch member projecting therefrom and engaging said shoulder when the plug and socket are properly mated to prevent separation of the plug and socket during use of the cords, and said shoulder projecting outwardly from said face between two of said openings connected to respective current-carrying conductors and from a side of said socket opposite said grounding connector.