Composite string material
AssigneeHoyt Archery, Inc.
InventorsGideon S. Jolley, Chris Webster
Life of this patent
Estimating the term…
Abstract
A composite string such as a bowstring or cable used in archery bows and crossbows includes multiple types of strands or multiple types of materials in its strands. The different materials or strands have different properties such as stiffness, strength, abrasion resistance, or density. The string therefore has specialized properties such as different properties when subjected to different tensile loads or optimized durability. A serving material is also used to bind strands of material to the string for silencing, vibration dampening, improving durability, or providing additional rigidity to select portions of the string.
Claims32
A composite archery string, comprising:
- a plurality of generally longitudinal strands comprising at least a first strand and a second strand, the first strand having a first length, the second strand having a second length, the first length being different from the second length;
- wherein upon application of a first tensile load to the plurality of generally longitudinal strands, the first strand bears a first proportion of first tensile load relative to the second strand;
- wherein upon application of a second tensile load to the plurality of generally longitudinal strands, the first strand bears a second proportion of the second tensile load relative to the second strand, the second proportion being less than the first proportion, the second tensile load being greater than the first tensile load.
A composite archery string, comprising:
- a plurality of entwined strands comprising a first portion of strands, a second portion of strands, and a generally longitudinal axis, the first portion of strands and second portion of strands each extending substantially parallel to the generally longitudinal axis, the first and second portions of strands each having an equal helical twist rate per unit length along the longitudinal axis, the first portion of strands comprising a first length and a first material, the second portion of strands comprising a second length and a second material, the first length being different from the second length, the first material being different from the second material.
An archery bow, comprising:
- a riser;
- an upper limb and a lower limb, the upper and lower limbs being connected to the riser;
- an upper string contacting portion and a lower string contacting portion, the upper string contacting portion being positioned on the upper limb, the lower string contacting portion being positioned on the lower limb;
- a string extending from the upper limb to the lower limb, the string comprising a composite material having a first portion contacting the upper string contacting portion, a second portion contacting the lower string contacting portion, and a third portion extending between the first portion and the second portion;
- wherein the first portion of the composite material comprises a first density, the third portion of the composite material comprises a second density, and the first density is greater than the second density.
A composite archery string, comprising:
- a plurality of generally longitudinal strands, the plurality of generally longitudinal strands having a first density;
- a helically winding material positioned around the plurality of generally longitudinal strands, the helically winding material having a second density, the second density being greater than the first density.
Dependencies are inferred from the claim text.