Patents by Inventor Hans J. Drewitz

Hans J. Drewitz 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).

  • Articulated vehicle selectively driven at two axles from two power sources
    Patent number: 4762191
    Abstract: A vehicle, more especially in the form of an articulated omnibus, has a hybrid drive system comprising an IC engine and an electric motor, whose power is transmitted not only to an axle driven by the IC engine but in addition to a further drive axle in order to extend the working life of the transmission axles.
    Type: Grant
    Filed: June 4, 1986
    Date of Patent: August 9, 1988
    Assignee: MAN Nutzfahrzeuge GmbH
    Inventors: Faust Hagin, Hans J. Drewitz
  • Hydrostatic drive
    Patent number: 4716730
    Abstract: In a hydrostatic drive one hydrostatic machine (2 and 4) is adapted for absorbing the sustained braking power or energy. The transmission is furthermore provided with a cooler (9) whose two sides are respectively connected via a threshold pressure valve (7 and 8) with one of two branch ducts (3 and 5) which connect the said hydrostatic machine with a second such machine adapted to act as a drive. The pressure threshold valve is made up of a pressure limiting and check valve.
    Type: Grant
    Filed: March 10, 1986
    Date of Patent: January 5, 1988
    Assignee: M A N Nutzfahrzeuge GmbH
    Inventors: Faust Hagin, Stefan Martini, Hans J. Drewitz
  • Pipe connection
    Patent number: 4647084
    Abstract: The invention relates to a fluid tight pipe connection having an intermediate ring between the two pipe ends. By making the two surfaces of the ring complementary to the pipe end faces the ring may be displaced in relation to one pipe end and may be moved pivotally in relation to the other pipe end to enable the connection to allow for angular misalignment and parallel offset of the pipe axes while still maintaining a sealing joint.
    Type: Grant
    Filed: March 12, 1986
    Date of Patent: March 3, 1987
    Assignee: M.A.N. Maschinenfabrik Augsburg-Nurnberg AG
    Inventors: Faust Hagin, Stefan Martini, Hans J. Drewitz
  • Multiple-link articulated bus
    Patent number: 4473127
    Abstract: A bus having at least three pivotally-connected vehicle members, one of which has two axles spaced from each other, one of these axles being a steering axle. Each of the other vehicle members has a single axle. An engine in the tail vehicle member drives all the live axles through a train of articulated shafts.
    Type: Grant
    Filed: August 13, 1982
    Date of Patent: September 25, 1984
    Assignee: Man Maschinenfabrik Augsburg-Nurnberg AG
    Inventors: Hagin Faust, Hans J. Drewitz
  • Articulated bus
    Patent number: 4469187
    Abstract: Articulated bus having a two-axle leading car and a single-axle trailing car. The leading car has a driving axle which is driven alternatively by an internal-combustion engine arranged in the trailing car and an electric motor arranged in the leading car.
    Type: Grant
    Filed: August 13, 1982
    Date of Patent: September 4, 1984
    Assignee: M.A.N. Maschinenfabrik Augsburg-Nurnberg AG
    Inventors: Faust Hagin, Hans J. Drewitz
  • Power divider gearbox with a planetary differential gear drive
    Patent number: 4446756
    Abstract: A power divider gearbox including a planetary differential gear drive, comprising dual planetary gears which mesh with two sun gears having different diameters and with an internal ring gear, wherein the planetary differential gear drive divides the incoming power input transmitted to the power divider gearbox through an input shaft into a mechanical branch and into a hydraulic branch (displacement machine) and in which the last-mentioned branch is connected to the internal ring gear of the planetary differential gear drive.
    Type: Grant
    Filed: December 10, 1980
    Date of Patent: May 8, 1984
    Assignee: Maschinenfabrik Augsburg-Nurnberg Aktiengesellschaft
    Inventors: Faust Hagin, Hans J. Drewitz