Archery recurve bow limb
a bow limb and archery technology, applied in bows/crossbows, white arms/cold weapons, weapons, etc., can solve the problems of limited elasticity of fibreglass and wood recurve bow limbs, moderate tensile strength, and disadvantages of bows when being used, stored or transported, so as to improve elasticity, strength and toughness, and improve the range of fibreglass.
Inactive Publication Date: 2011-10-20
ROBERTSON COLIN WILLIAM
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- Description
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- Application Information
AI Technical Summary
Benefits of technology
The patent describes a new type of bow made from heat treated carbon steel that has improved flexibility, strength, and toughness compared to traditional fibreglass and wood recurve bows. The carbon steel recurve limbs are shorter and have a greater curvature, which allows for more movement and flexibility. This design also reduces the overall length of the bow and makes it more compact for storage and use in limited space.
Problems solved by technology
Present archery recurve bows have long limbs typically made from fibreglass and wood which put such bows at a disadvantage when being used, stored or transported.
Fibreglass and wood recurve bow limbs have a limited range of elasticity, and moderate tensile strength due to the materials physical properties that are weaker than heat treated carbon steel.
Method used
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[0012]This invention involves the usage of heat treating by quench hardening and tempering carbon steel at various percent carbon content, thickness, and hardness to make new and improved archery recurve bow limbs that are strong, tough, and elastic. The steel carbon percent content in claim 1, is also known as medium and high carbon Spring steel and Tool steel, and ranges from 0.30% to 1.30%. The steel carbon percent content, the steel guage or thickness, and the Rockwell hardness “C” scale number, all must be used in proper combination to make a useful and effective carbon steel recurve bow limb.
[0013]The claims cover these requirements to make a wide range of recurve bow limbs that equate to archery draw weights from 30 to 60 pounds (see FIG. 2.), which covers most usage situations from target shooting to hunting game. The range of Rockwell hardness from HRc 35 to HRc 55 in claim 3, is the useful applied range of hardness for the carbon steel in claim 1, to cover the different si...
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Abstract
The making of carbon steel recurve bow limbs involves a number of procedures. Strips of annealed or softer carbon steel 18 to 20 inches long and 1.5 inches wide have a hole drilled at one end of each strip for attaching the limb to the bow, and grooves made at the other end for attaching the bowstring. After forming the limbs into the curvature shown in FIGS. 1. and 3. they are heated in a furnace for 45 minutes at about 1550 degrees F. and then quenched (cooled quickly) in oil which makes the steel hard and brittle. The hardened limbs are then reheated for two hours at about 700 degrees F. depending on the steel percent carbon content and then air cooled. This tempering makes the steel strong, tough, and elastic; the finished limbs act as cantilever springs when used on a bow. This is a new application of the art and science heat treating to make the limbs of very effective sporting recurve style archery bows.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS[0001]Not Applicable.STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPEMENT[0002]Not Applicable.REFERENCE TO SEQUENCE LISTING, A TABLE, OR A COMPUTER PROGRAM LISTING COMPACT DISC APPENDIX[0003]Not Applicable.BACKGROUND OF THE INVENTION[0004]This invention relates to the usage of heat treating of carbon steel to make new and improved archery recurve bow limbs. Present archery recurve bows have long limbs typically made from fibreglass and wood which put such bows at a disadvantage when being used, stored or transported. Fibreglass and wood recurve bow limbs have a limited range of elasticity, and moderate tensile strength due to the materials physical properties that are weaker than heat treated carbon steel. Recurve bows have two detachable or non detachable limbs connected at there ends by a bowstring that propels an archery arrow when drawn backwards. The term “recurve” is the common name of this archery bow type, and there is no ot...
Claims
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IPC IPC(8): F41B5/14
CPCF41B5/0005
Inventor ROBERTSON, COLIN WILLIAM
Owner ROBERTSON COLIN WILLIAM