Patents by Inventor Gerhard Kempf

Gerhard Kempf 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: 6467250
    Abstract: A method for the manufacture of an elastic twisted yarn has at least one outer yarn wound or twisted around an expanded, elastic core yarn. In a first process step the outer yarn is wound around the core yarn with a winding speed providing less than the nominal twist of the finished twisted yarn. The thus formed intermediate yarn is wound up and then twisted in the same direction of rotation in a second process step. In the first process step the outer yarn is wound with the help of a double-pot spindle at a winding rate providing a twist of above 50% of the nominal twist without forming a balloon around the core yarn, and the second process step is carried out on a double-twist spindle.
    Type: Grant
    Filed: April 18, 2001
    Date of Patent: October 22, 2002
    Assignee: Hamel AG
    Inventor: Gerhard Kempf
  • Publication number: 20010032449
    Abstract: The invention relates to a method for the manufacture of an elastic twisted yarn, whereby at least one outer yarn is wound around an expanded, elastic core yarn and in a first process step the outer yarn is wound around the core yarn with a winding speed which is less than the nominal speed of the finished twisted yarn, the thus formed intermediate yarn is wound up, and the in-between yarn is twisted in the same direction of rotation in a second process step. In the first process step the outer yarn is wound with the help of a double-pot spindle and at a winding rate of above 50% of the nominal speed without a balloon around the core yarn, and the second process step is carried out on a double-twist spindle.
    Type: Application
    Filed: April 18, 2001
    Publication date: October 25, 2001
    Inventor: Gerhard Kempf
  • Patent number: 4693069
    Abstract: A heat-insulating jacket extends around each rotating can of a doubling machine. Half way up the height of the can envelope surface, an extraction line for extracting the air heated by friction as the can rotates extends into the interior between the jacket and the can. The end-face boundaries of the rotating can and/or top and bottom closure members of the jacket are such that the pressures of the air drawn into the jacket are at least substantially equal at the top and at the bottom.
    Type: Grant
    Filed: September 3, 1986
    Date of Patent: September 15, 1987
    Assignees: Sulzer Brothers Ltd., Carl Hamel Spinn-& Zwirnmaschine AG
    Inventors: Christian Imhof, Gerhard Kempf
  • Patent number: 4276739
    Abstract: A multiply effect yarn is wound up from a plurality of strands on a yarn-winding body that is rotated at a variable predetermined speed. Each of the strands is fed via a respective strand-feed element to the yarn-winding body. The feed rate of each of these strand-feed elements can be individually varied, and is established as a function of the rotation rate of the yarn-winding body to maintain a predetermined proportionality between the various speeds. The drive for each strand-feed element comprises a separate pair of variable-speed motors set to operate at different speeds and operated by forward and backward counters so that either the one motor or the other motor of each drive is connected to the respective feed element which can also be connected to a brake, if desired. The various speed rates can rapidly be adjusted, in accordance with the overall drive rate for the yarn-winding body, even during production of the multiply effect yarn.
    Type: Grant
    Filed: November 14, 1979
    Date of Patent: July 7, 1981
    Assignee: Evolution SA
    Inventors: Gerhard Kempf, Albert Kunz
  • Patent number: 4075445
    Abstract: A filament supplied to a textile machine is held under tension by a thread mounted on a weighted or otherwise biased lever which trips a switch to arrest the machine upon rupture of the filament. In normal operation, the lever is held against a stop by the tension of the thread supplemented by the force of a magnet whose attraction diminishes rapidly over the swing range of the lever, the biasing force slightly exceeding the magnetic force in the normal lever position to prevent oscillations in response to minor fluctuations in filament tension but to initiate a rapid cutoff in the event of a break.
    Type: Grant
    Filed: April 14, 1976
    Date of Patent: February 21, 1978
    Assignee: Evolution SA
    Inventor: Gerhard Kempf