Patents by Inventor Lawrence H. C. Plumridge

Lawrence H. C. Plumridge 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).

  • Patent number: 4619453
    Abstract: An exercise device which includes a head structure; a weight member; an elongated flexible member attached at one end to the weight member and at the other end being attachable to a handle; and a support member attached to the suspension links and being adapted to guide the flexible member. The head attachment structure comprises two spaced engaging members, each of which is adapted to engage with connect the two spaced engaging members, and a pair of suspension links, each of which is connected at one end at one of the engaging members and which links are linked together. The combined length of the pair of links is greater than the length of the connection link. When the flexible member is pulled for lifting the weight member, a force is exerted via the attachment member on the pair of suspension links for urging the engaging member outwardly towards the vertical posts of a door frame to which the structure is fitted.
    Type: Grant
    Filed: November 1, 1984
    Date of Patent: October 28, 1986
    Inventor: Lawrence H. C. Plumridge