Patents by Inventor David A. Lotarski

David A. Lotarski 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: 10228043
    Abstract: In one aspect, a vibratory tool is provided for driving a plurality of rivets out from bores of a guide block into an underlying conveyor belt. The tool has a body, a hydraulically operated main drive rod mounted to the body, and a driver aligned with the main drive rod and slidably mounted to the body. The driver has a plurality of elongated drive rod members for engaging and simultaneously driving multiple rivets out of the guide block bores. The driver has an intermediate impact surface for being impacted by the main drive rod impact end as the main drive rod impact end rapidly reciprocates between retracted and extended positions. The driver also has a rearwardly extending spacer wall for axially spacing the driver intermediate impact surface and the main drive rod impact end in the retracted position thereof by at least a predetermined axial distance sized for optimizing energy transfer from the main drive rod to the driver.
    Type: Grant
    Filed: March 27, 2015
    Date of Patent: March 12, 2019
    Assignee: Flexible Steel Lacing Company
    Inventors: Pan Yim Ng, David A. Lotarski, Ahmed Mohamed Nagib Mohamed Elmetwaly Elmekawy
  • Publication number: 20150273568
    Abstract: In one aspect, a vibratory tool is provided for driving a plurality of rivets out from bores of a guide block into an underlying conveyor belt. The tool has a body, a hydraulically operated main drive rod mounted to the body, and a driver aligned with the main drive rod and slidably mounted to the body. The driver has a plurality of elongated drive rod members for engaging and simultaneously driving multiple rivets out of the guide block bores. The driver has an intermediate impact surface for being impacted by the main drive rod impact end as the main drive rod impact end rapidly reciprocates between retracted and extended positions. The driver also has a rearwardly extending spacer wall for axially spacing the driver intermediate impact surface and the main drive rod impact end in the retracted position thereof by at least a predetermined axial distance sized for optimizing energy transfer from the main drive rod to the driver.
    Type: Application
    Filed: March 27, 2015
    Publication date: October 1, 2015
    Inventors: Pan Yim Ng, David A. Lotarski, Ahmed Mohamed Nagib Mohamed Elmetwaly Elmekawy
  • Patent number: 5852877
    Abstract: A belt skiving apparatus and method in which a free-standing blade-carrying carriage is employed which does not require a guiding base. The carriage has a pair of rollers defining a nip into which a belt end to be skived is passed. The rollers press together about the belt end to securely grip the belt. One of the rollers is toothed to provide a non-slip engagement with the surface of the belt and at least one of the rollers is driven, preferably manually, through a crank arm. Rotation of the rollers advances the carriage relative to the belt to advance the carriage across the width of the belt. As the carriage is advanced, the belt is passed through the rollers and through a cutting blade disposed adjacent the rollers. As the carriage is advanced along the width of the belt, the blade slices a thin strip of the upper portion of the belt adjacent its upper face from the remainder of the belt. The thin strip that is removed is the portion of the belt that was punctured by the teeth of the driving roller.
    Type: Grant
    Filed: July 23, 1996
    Date of Patent: December 29, 1998
    Assignee: Flexible Steel Lacing Company
    Inventors: David A. Lotarski, Joseph C. Vogrig
  • Patent number: 5771586
    Abstract: A belt skiving apparatus is provided having a free-standing blade-carrying carriage mounting a pair of rollers defining a nip into which a belt end to be skived is passed. The rollers press together about the belt end to securely grip the belt, with at least one of the rollers being driven, preferably manually, through a crank arm. Rotation of the rollers advances the carriage relative to the belt to advance the carriage across the width of the belt. As the carriage is advanced, the belt is passed through the rollers and through a cutting blade disposed adjacent the rollers, with the blade slicing a thin strip of the upper portion of the belt adjacent its upper face from the remainder of the belt. The rollers may be driven by a ratchet arm to move the carriage along the belt end. Preferably, two pairs of rollers are employed on the carriage, one forward and one rearward of the blade to cut the uncut portion remaining at the trailing side of the belt after the belt passes through the forward roller pair.
    Type: Grant
    Filed: June 6, 1995
    Date of Patent: June 30, 1998
    Assignee: Flexible Steel Lacing Company
    Inventors: David A. Lotarski, Joseph C. Vogrig