Patents by Inventor David E. Hirsch

David E. Hirsch 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: 5423730
    Abstract: A physical fitness training apparatus which may be readily installed in a door frame. The apparatus includes an extendable screw threaded support bar assembly (22) having rubber feet (28) at either end which may engage the sides of a door frame in an elevated position. Mounted on the support bar assembly are two radially outwardly extending eyes (52). A first pulley block (14) may be secured to one of the eyes (52) by a quick connector (60). A second pulley block (16) is provided and intermediate portions (74, 76) of a primary line (18) engage the sheaves (58) of each of the pulley blocks. The ends of the line are formed into eyes and one end (80) may be connected to the other radially outwardly extending eye (52) by means of another quick connector (60). A weight holder (12) is connected to an eye (56) on the second pulley block (16) by means of another quick connector (60). An engagement device is connected to the eye (78) on the other end of the line by another quick connector (60).
    Type: Grant
    Filed: April 10, 1992
    Date of Patent: June 13, 1995
    Inventor: David E. Hirsch
  • Patent number: 4974836
    Abstract: A resistance weight kit which may be readily installed in a door frame. The resistance weight kit includes an extendable screw threaded support bar assembly (22) having rubber feet (28) at either end which may engage the sides of a door frame in an elevated position. Mounted on the support bar assembly are two radiallly outwardly extending eyes (52). A first pulley block (14) may be secured to one of the eyes (52) by a quick connector (60). A second pulley block (16) is provided and intermediate portions (74, 76) of a primary rope (18) engage the sheaves (58) of each of the pulley blocks. The ends of the rope are formed into eyes and one end (80) may be connected to the other radially outwardly extending eye (52) by another quick connector (60). A weight holder (12) is connected to an eye (56) on the second pulley block (16) by another quick connector (60). An engagement device is connected to the eye (78 ) on the other end of the rope by another quick connector (60).
    Type: Grant
    Filed: April 19, 1989
    Date of Patent: December 4, 1990
    Inventor: David E. Hirsch