Patents by Inventor Duane K. Gehrke

Duane K. Gehrke 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: 5525114
    Abstract: An endless driven sprocket chain (10) includes inner links (24) which couple to outer links (26) through a resilient bushing (50). A pin (42) having a shaft (44) with a hexagonal cross sectional shape mates with a corresponding hole in outer link plates (32, 34). The shaft (44) also mates with a hexagonal cross sectional shaped hole in the bushing (50) through an metallic insert (56). The bushing is pressed into a metallic sleeve (58) which in turn is press fit into inner link plates (28, 30) at holes (36) therein. The hexagonal alignment of the holes (40) in the outer link plates (32, 34) with the corresponding hole (54) in bushing 50 defines a resting position where the inner links (24) reside at an oblique angle to the outer links (26). When the inner links (24) form a substantially straight line with the outer links (26) the bushing is deformed and imposes a force of the links (24, 26) that urges the links (24, 26) toward the resting position.
    Type: Grant
    Filed: October 13, 1994
    Date of Patent: June 11, 1996
    Inventor: Duane K. Gehrke