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US 8,944,038 B2Granted
Crossbow riser
AssigneeHunter's Manufacturing Co., Inc.
InventorsRichard L. Bednar, Richard W. Gardner, Michael J. Shaffer
Life of this patent
Estimating the term…
Abstract
Provided is a crossbow riser that may comprise a plurality of cells defined by walls. The walls may consist essentially of a material wherein the yield tensile strength at 0.2% strain is greater than 780 MPa, and either the specific strength is greater than 200 kN·m/kg, or the density is less than 6.0 g/cc. The cells may collectively define a first volume. The walls may collectively define a second volume. The ratio of the first volume to the second volume may be greater than 1.5.
Claims20
A crossbow riser comprising:
- a plurality of cells defined by walls wherein,
- said walls consisting essentially of a material wherein the
- yield tensile strength at 0.2% strain is greater than 780 MPa, and either
- the specific strength is greater than 200 kNm/kg, or
- the density is less than 6.0 g/cc;
- and said cells collectively define a first volume, said walls collectively define a second volume, and the ratio of said first volume to said second volume is greater than 1.5.
3 more elements
A crossbow comprising:
- a bowstring movable between a cocked position and an uncocked position, said cocked position defining an operational plane;
- and
- a riser comprising a planar upper surface substantially parallel to said operational plane and a planar lower surface;
- and
- a set of one or more cells defined by a set of one or more walls, each of said one or more cells being in communication with both said upper surface and said lower surface, each of said set of one or more cells and said one or more walls having a cross-sectional area defined by a sectional plane parallel to said upper surface that is substantially constant along a dimension normal to said upper surface, and wherein the ratio of the area of the set of one or more cells to the area of the set of one or more walls is greater than 2.0.
2 more elements
A crossbow comprising:
- a main beam;
- a riser comprising:
- (1) a connection portion that connects said riser to said main beam;
- (2) a first limb holder;
- (3) a second limb holder;
- and, (4) one or more through holes configured to create a bulk density of less than 4.5 g/cc for said riser;
- and,
- a bow comprising:
- (1) a first limb comprising a first end supported to said first limb holder and a second end;
- (2) a second limb comprising a first end supported to said second limb holder and a second end;
- and, (3) a bowstring that is:
- (a) operatively received by said second ends of said first and second limbs;
- and, (b) moveable between an uncocked position and a cocked position to propel an associated arrow away from said crossbow.
10 more elements
Dependencies are inferred from the claim text.