Patents by Inventor Edgar R. Engle

Edgar R. Engle has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Double switch safety system and signaling device for a trailer hitch coupling
    Patent number: 5159312
    Abstract: A trailer hitch alarm system having a double safety switch for a ball and socket coupling in combination with an alarm system to provide an alarm signal indication that the socket has become loose from the ball or that the ball has become loose from the towing vehicle frame.
    Type: Grant
    Filed: April 1, 1991
    Date of Patent: October 27, 1992
    Inventor: Edgar R. Engle
  • Trailer hitch signaling device
    Patent number: 4593264
    Abstract: A dual trailer hitch warning system for use with a ball and socket trailer hitch including an electrically operated alarm system for signaling a loose coupling of the socket member on the ball member. A switch is mounted within the ball member which energizes an alarm relay circuit when the ball switch operates due to a loose coupling to complete an alarm circuit between the automobile battery and the horn. The warning system also includes a tampering relay circuit adapted to provide an alarm signal if an attempt is made to disengage or short out the alarm circuit or if the socket and ball member are deliberately uncoupled.
    Type: Grant
    Filed: October 19, 1983
    Date of Patent: June 3, 1986
    Inventor: Edgar R. Engle