Patents by Inventor John Schaar

John Schaar 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: 4706965
    Abstract: An improved arrow system comprises an arrow shaft having first and second tubular end sections each having substantially parallel inner and outer surfaces, and an intermediate tubular section which is fixedly coupled between the first and second tubular end sections and having an inner diameter which is greatest at its ends and which decreases toward the longitudinal center of the intermediate section. An adjustable weight arrow point assembly co-operates with the first tubular end section while an adjustable weight self-aligning nock assembly co-operates with the second tubular end section.
    Type: Grant
    Filed: May 31, 1985
    Date of Patent: November 17, 1987
    Inventor: John Schaar
  • Patent number: 4669445
    Abstract: Limb/pulley torque in a compound bow is negated by providing a restoring force, as a result of the deflected bow when drawn, comprised of unequal components which balance the torsional force imparted to the bow end by the summation of forces applied by the cable. In accordance with one embodiment, the unequal components are achieved by employing unequal cross sectional areas in the material of the respective two sides about the longitudinal axis of the bow. In another embodiment, the pulley/cam structure and the tieoff element which support the cable are spaced at predetermined distances from the longitudinal axis of the bow to yield respective torque having equal magnitude and opposite direction.
    Type: Grant
    Filed: April 16, 1984
    Date of Patent: June 2, 1987
    Assignee: Grand Slam Archery, Ltd.
    Inventor: John Schaar
  • Patent number: 4607606
    Abstract: A bow mounted quiver includes a storage apparatus for releasably housing a plurality of arrows on one side of the bow and a counterweight mounted on an opposite side of the bow to compensate for the twisting torque produced by the weight of the storage apparatus and the arrows contained therein. Both the counterweight and the storage apparatus are secured to the bow by means of externally threaded shaft members. In a preferred embodiment, one counterweight threadably engages the external threads on the shaft member and is rotatable thereon so as to vary the torque produced thereby. That is, as arrows are removed from the quiver, the counterweight may be rotated clockwise so as to cause its movement toward the bow. As arrows are added to the quiver, the counterweight is rotated counter-clockwise increasing its distance from the bow and thereby increasing the torque produced thereby.
    Type: Grant
    Filed: August 26, 1983
    Date of Patent: August 26, 1986
    Assignee: Grand Slam Archery
    Inventor: John Schaar
  • Patent number: 4533146
    Abstract: An improved arrow system comprises an arrow shaft having first and second tubular end sections each having substantially parallel inner and outer surfaces, and an intermediate tubular section which is fixedly coupled between the first and second tubular end sections and having an inner diameter which is greatest at its ends and which decreases toward the longitudinal center of the intermediate section. An adjustable weight arrow point assembly co-operates with the first tubular end section while an adjustable weight self-aligning nock assembly co-operates with the second tubular end section. The coupling between the arrow point and shaft also provides for alignment of the former on the latter.
    Type: Grant
    Filed: May 12, 1983
    Date of Patent: August 6, 1985
    Inventor: John Schaar