Patents by Inventor Michael P. Burrell

Michael P. Burrell 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).

  • Self centering elevator cable safety brake
    Patent number: 5197571
    Abstract: An elevator cable safety brake is disclosed. The brake includes a first housing which is slidably mounted in a second housing. The first housing has an opening through which the elevator cables can pass. On one side of the elevator cables is located a first brake pad which is carried by the first housing. On the other side of the opening is located a second brake pad which is generally wedge shaped. The second brake pad is carried on a sled which is slidably housed within the first housing. The second brake pad may be moved between a free running position and a braking position. The wedge shaped second brake pad may be selectively released under certain trip conditions from the free running position to the braking position. Such conditions include the unintended overspeed operation of the elevator, a power failure, or the elevator commencing movement before the elevator doors are fully closed. A governor trips a trip lever effecting the release of the second wedge shaped brake pad.
    Type: Grant
    Filed: March 26, 1992
    Date of Patent: March 30, 1993
    Inventors: Michael P. Burrell, Ryszard J. Ambrozy
  • Self centering elevator cable safety brake
    Patent number: 5101937
    Abstract: An elevator cable safety brake is disclosed. The brake includes a first housing which is slidably mounted in a second housing. The first housing has an opening through which the elevator cables can pass. On one side of the elevator cables is located a first brake pad which is carried by the first housing. On the other side of the opening is located a second brake pad which is generally wedge shaped. The second brake pad is carried on a sled which is slidably housed within the first housing. The second brake pad may be moved between a free running position and a braking position. The wedge shaped second brake pad may be selectively released under certain trip conditions from the free running position to the braking position. Such conditions include the unintended overspeed operation of the elevator, a power failure, or the elevator commencing movement before the elevator doors are fully closed. A governor trips a trip lever effecting the release of the second wedge shaped brake pad.
    Type: Grant
    Filed: June 3, 1991
    Date of Patent: April 7, 1992
    Inventors: Michael P. Burrell, Ryszard J. Ambrozy
  • Joist
    Patent number: 4159604
    Abstract: The disclosure relates to the type of joist having an upper chord in the form of an inverted top-hat channel into which an insert is forced. The inner faces of the side walls of the channel converge towards one another at the top of the channel and the width of the bottom of the channel is greater than the width of the bottom of the insert.
    Type: Grant
    Filed: January 5, 1978
    Date of Patent: July 3, 1979
    Assignee: Anthes Equipment Limited
    Inventor: Michael P. Burrell