US 4,041,927 AGranted

Archery bow with pivoted bow limbs having rotational synchronizer and adjustable draw force mechanisms

OwnerRobert M. Van Houseinventor

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Abstract

An archery bow which uses a single adjustable load spring instead of the usual pair of flexible bow limbs as the resilient energy medium. Bow limbs which are relatively rigid are pivoted on the handle section and are coupled together and synchronized in travel rate and equalized in forces by a single synchronizing linkage. A single adjustable ratio changing mechanism is used to provide a high mid draw force and a low full draw force and include structure to change the draw distance at which these draw forces occur. These three features: a single adjustable spring, a single synchronizing mechanism and a single adjustable ratio changing mechanism make the bow highly efficient, easy to hold at full draw and readily adjustable for short or tall, weak or strong archers.

Claims13

Dependent claims

An archery bow comprising:

a generally elongate central handle member having a pair of opposed end portions,
a master bow limb pivotally attached to the central handle member adjacent one end portion thereof,
a slave bow limb pivotally attached to the central handle member adjacent the other end portion thereof,
only one single elongate tension means extending through the elongate central handle member and provided with a pair of opposed free end portions and having one free end portion secured to the master bow limb and having the other end portion secured to the slave bow limb for synchronizing pivotal movement of the limbs, the tension means extending between the master bow limb and the slave bow limb.
single spring means for exerting a force through one of said bow limbs in opposition to a drawing force on the bow limbs by a user,
means attaching the single spring means to the central handle member, for support thereby,
linkage means connecting the spring means only to the master bow limb, for operation therewith,
and a bow string connected to the limbs adjacent a portion thereof which is spaced from the central handle member.

5 more elements

Dependencies are inferred from the claim text.