Patents by Inventor David M. Hansen

David M. Hansen 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).

  • Press having a linkage mechanism connectable and disconnectable from a ram
    Patent number: 4393684
    Abstract: A press for assembling a fastener or the like to a plate or the like comprises a frame and an anvil assembly carried by said frame. A toggle mechanism assembly is carried by the frame and includes two toggle links. A ram is operatively connectable to the toggle links. A first pneumatic cylinder and piston assembly holds the ram in a raised position. A first pneumatic switch terminates the flow of pressurized air to the first pneumatic cylinder, thereby permitting the ram to drop by gravity. A second pneumatic switch is activated after a sufficient drop of said piston to energize a second pneumatic cylinder and piston assembly for extending and retracting said toggle links, and thereby forcefully lower the ram to install the fastener or the like to a plate or the like.
    Type: Grant
    Filed: February 12, 1981
    Date of Patent: July 19, 1983
    Assignee: Penn Engineering & Manufacturing Corp.
    Inventors: David M. Hansen, Richard B. Ernest