Patents by Inventor Helmut Lieske

Helmut Lieske 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: 5439629
    Abstract: A method for the manufacture of pretensioned prestressed concrete sleepers wherein, the tensioning wires are taken directly from one or more rolls of wire and are introduced in a longitudinal feed into a tensioning frame, and the tensioning wires (5) are initially anchored at the end thereof located at the front in feed direction. The wires are tensioned by a tensioning device arranged outside of the tensioning frame and resting against the opposite end thereof, and the wires (5) are anchored at the tensioning device; only then are the wires severed by means of a severing device. In this manner, it is possible to combine in a single station the operating stages of cutting to length, introducing and tensioning the wires, which stages in the past were distributed over several manufacturing stations, so that the labor intensive and time consuming manipulation of wires which have been previously cut to length is eliminated.
    Type: Grant
    Filed: December 23, 1993
    Date of Patent: August 8, 1995
    Assignee: Dyckerhoff & Widmann Aktiengesellschaft
    Inventors: Joachim Heintz, Peter Auer, Helmut Lieske, Peter Plica
  • Patent number: 5135164
    Abstract: A prestressed concrete railroad tie having a tie body made up of two end members for supporting rail attachment parts and a central section extending between and interconnecting the end members and having a transverse cross-section smaller than the transverse section of the end members. Tendons are located in the tie body and extend in opposite directions from a common vertical or horizontal plane in the central section into the end members. At tie ends of the end members the tendons are anchored and are uniformly distributed across the transverse cross-section of the end members. With the tendons centered in the central member, a narrow central member is afforded. The tendons fan outwardly from the common plane in the central section into the end members providing wider or larger end members. This prestressed concrete tie arrangement affords only low changing bending moments in the central section or a positive course of bending moments across the length of the tie.
    Type: Grant
    Filed: September 7, 1990
    Date of Patent: August 4, 1992
    Assignee: Dyckerhoff & Widmann Aktiengesellschaft
    Inventors: Peter Auer, Josef Eisermann, Helmut Lieske, Gunther Leykauf, Peter Plica
  • Patent number: 4905896
    Abstract: A railroad railway for rail-mounted vehicles capable of high speed travel includes a track grating formed of rails and ties with the ties partially embedded in a poured-in-place steel reinforced concrete slab. The concrete slab is mounted on a continuous concrete substructure with a separating layer arranged between the slab and substructure. A single layer of steel reinforcement is located in the concrete slab spaced below the ties. The slab is dimensioned so that it serves only for plate-like stiffening of the track grating without any appreciable inherent bending resistance. The slab is secured against longitudinal and transverse displacement of the substructure, while the substructure is dimensioned to absorb bending moments developed in the longitudinal direction of the rails. The concrete slab is divided in the longitudinal direction by transversely extending expansion joints whereby sections of the slab can be replaced if damage occurs.
    Type: Grant
    Filed: October 25, 1988
    Date of Patent: March 6, 1990
    Assignee: Dyckerhoff & Widmann Aktiengesellschaft
    Inventors: Josef Eisenmann, Dieter Hilliges, Gunther Leykauf, Helmut Lieske, Herbert Schambeck, Werner Sievers
  • Patent number: 4489024
    Abstract: Prefabricated prestressed concrete members are formed on a stressing bed with a number of working stations arranged next to one another along the length of the bed. A frame froms the working stations and the frame is movable over the stressing bed. With a previously poured concrete member in one of the working stations, part of a form is placed in another working station and is filled with concrete. After the form part is completely filled and consolidated, a second form part is placed downwardly on the filled part completing the form. A lifting member on the frame which placed the second form part on the filled part is then moved to the station containing the previously poured member which is still within the form. The form is stripped from the concrete member and the frame is then moved along with the lifting member returning the stripped form to the working station where it is to be filled with concrete.
    Type: Grant
    Filed: July 20, 1981
    Date of Patent: December 18, 1984
    Assignee: Dyckerhoff & Widmann Aktiengesellschaft
    Inventors: Peter Auer, Fritz Kluge, Helmut Lieske, Host Wutzler
  • Patent number: 4105382
    Abstract: An apparatus for continuously producing finished prestressed concrete wires along a prestressing bed with a plurality of prestressing members which extend along the prestressing bed and which are arranged to pass through the concrete members when formed. The apparatus includes a scaffold which spans the prestressing bed in a gantry-like fashion and is supported for movement in a direction parallel to the bed. The scaffold extends over at least two adjacent stations along the prestressing bed for producing the finished prestressed concrete members. A number of vertically movable lower form members are carried on the scaffold for movement to a lowered position on the prestressing bed for receiving fresh concrete to form the concrete members. After the concrete members are formed and bonded the lower form member may be raised away from the finished concrete member.
    Type: Grant
    Filed: March 22, 1977
    Date of Patent: August 8, 1978
    Assignee: Dyckerhoff & Widmann Aktiengesellschaft
    Inventors: Peter Auer, Fritz Kluge, Helmut Lieske, Horst Wutzler