Shooting bow with springback compensation

• US 5,630,405 A
• Filed: 04/28/1995
• Issued: 05/20/1997
• Est. Priority Date: 09/15/1993
• Status: Expired due to Fees

• Current Assignee: Sergei N. Nizov
• Original Assignee: Sergei N. Nizov
• Inventors: Nizov, Sergei N.
• Primary Examiner(s): Ricci, John A.
• Application Number:
  US08/428,104
• Time in Patent Office: 753 Days
• Field of Search: 124/25, 124/25.6
• US Class Current: 124/25
• CPC Class Codes: F41B 5/123 Compound crossbows

Abstract

A shooting bow is employed for shooting in sporting events and for shooting game. The shooting bow includes a main part, arms, convex in the direction of shooting, and pulleys, fastened to free tips of the arms. A bowstring passes via the pulleys, and a frame mounts the main part and a trigger mechanism. On the frame there are fastened a guide of a carriage, made up with a track, a groove for the bowstring and cutouts. The number of cutouts corresponds to the number of fletchings of an arrow. The arms are made so that the total impulse of the "arms-pulleys" and "arrow-carriage" systems, at each instant of arms straightening, approaches zero.

Claims

1. A shooting bow comprising:

a main part;

a frame on which the main part is mounted;

arms, mounted on the main part and convex in a direction of shooting;

pulleys disposed at tips of the arms;

a bowstring, made up from two end spans and one middle span, passing said pulleys and through a horizontal slotted hole in the frame; and

a trigger mechanism mounted on the frame;

characterized in that said shooting bow further comprises a carriage, arranged on said bowstring, and a carriage guide, said frame is manufactured with a frame slot and a horizontal slotted hole disposed in its forward part, said carriage is made up with a groove for said bowstring, the carriage guide is arranged in the frame slot, the carriage is movable along said carriage guide, and the profile of the pulleys satisfies a relationship Δ

S₁ =KxΔ

S₂, wherein;

Δ

S₁ is a displacement of a centre of mass M₁ to a position M₁ '"'"' of a system including said arms and said pulleys;

Δ

S₂ is a displacement of a centre of mass M₂ to a position M₂ '"'"' of a system including an arrow and said carriage; and

K is a constant for a specific shooting bow at each instant of straightening of the arms, which is determined from Δ

S₁ /Δ

S₂, the arms satisfying the condition, when a total impulse of said systems acting on the main part at a point of fixation of said systems, at each instant of straightening of the arms, approaches zero.

2. A shooting bow according to claim 1, characterized in that said groove for said bowstring is made up with exit holes, lower edges of which are disposed below an upper surface of a longitudinal track of the carriage.

3. A shooting bow according to claim 1, and further comprising a pulling cord, wherein end spans of said bowstring are bifurcated, a middle span of said bowstring is made with swellings, and said pulling cord is made with an elastic rope, secured to the frame and fixed to the tips of the arms.