Crossbow Cable Slide for Balanced Auxiliary String Loading

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Solution Overview

Problem

The balance of modern compound crossbows is compromised due to uneven loading capacities of pulley assemblies and bow limb assemblies, leading to poor shooting accuracy, especially when the bowstring is pulled tightly, causing potential damage and hindrance in carrying and maneuvering.

Innovation Solution

A cable slide structure is introduced where two auxiliary strings are symmetrically fixed among the pulley assemblies and the cable slide, ensuring equal loading capacities and improved balance by connecting the auxiliary strings with the pulley assemblies and the cable slide, allowing the bowstring to be pulled tightly without damaging the crossbow's balance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Force

If the bow limb assembly extends laterally from two sides of the crossbow body to form a horizontal volume, then the crossbow obtains larger pulling force and higher arrow speed through eccentric pulleys, but the horizontal bow limb assembly hinders or restricts the user's movement and is difficult to carry

Engineering Contradiction:

Improvepulling forceVSAvoiduser movement

Core Design Contradiction:

ForceVSEase of operation

Solution Approach 1:

The patent positions the bow limb assembly within the contour of the crossbow body, nesting the lateral extending structure inside the overall device boundary. This allows the bow limb to maintain its horizontal configuration for generating pulling force while being contained within the crossbow's vertical profile, reducing obstruction to the user's body and movement.

Inventive Principle:

Principle #7Nested doll (Nesting)

2Ease of manufacture

If the two auxiliary strings are intersected and pass through the slot of the crossbow body with different heights, then the cable slide can accommodate the auxiliary strings, but the intersection of auxiliary strings is located beside the crossbow body causing damage of balance and poor shooting accuracy

Engineering Contradiction:

Improvecable slide configurationVSAvoidshooting accuracy

Core Design Contradiction:

Ease of manufactureVSManufacturing precision

Solution Approach 1:

The patent employs asymmetric height positioning of the two through orifices in the cable slide, with one orifice located higher than the other. This asymmetric configuration allows the auxiliary strings to pass through at different heights while maintaining proper tension and balance, preventing the strings from intersecting at a location that would compromise the crossbow's balance and shooting accuracy.

Inventive Principle:

Principle #4Asymmetry

3Ease of operation

If the cable slide has two through orifices located at different heights to accommodate auxiliary strings, then the auxiliary strings can be separated and formed to intersect beside the crossbow body, but this causes uneven loading capacities of pulley assemblies and bow limb assembly sides

Engineering Contradiction:

Improveauxiliary string arrangementVSAvoidcrossbow balance

Core Design Contradiction:

Ease of operationVSStability of the object's composition

Solution Approach 1:

The patent applies different vertical positions to the two through orifices in the cable slide, creating local quality variations in the string accommodation structure. By positioning one orifice higher than the other, the design allows each auxiliary string to have optimal tension and routing, ensuring equal loading capacities on both sides of the bow limb assembly while maintaining the crossbow's balance.

Inventive Principle:

Principle #3Local quality

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

This configuration enhances shooting accuracy by maintaining equal loading capacities across the pulley assemblies and bow limb assemblies, preventing damage and improving the crossbow's balance, allowing for smoother handling and operation.

Implementation Method 1

using a lever principle of the pulleys to pull the bow with heavier pulling force

Methodology Applied

Scientific EffectLever principle: Lever

Implementation Method 2

The eccentric pulleys are fixed on two ends of the bow limb assembly, and the bowstring is mounted on the eccentric pulleys and is received in a slot of the eccentric pulleys, such that using a lever principle of the pulleys to pull the bow with heavier pulling force

Methodology Applied

Scientific EffectPulley: Pulley

Data Source

PatentUS11686549B1Cable slide structure of crossbow

Publication Date: 2023.06.27 MAN KUNG ENTERPRISE CO LTD

AI summary

A cable slide structure of a crossbow, wherein the crossbow contains a crossbow body, a bow limb assembly, two pulley assemblies, a bowstring, two auxiliary strings, and a cable slide. The crossbow body includes a holder and a slot, and the bow limb assembly is fixed on the crossbow body. The two pulley assemblies are connected to two edges of the bow limb assembly, and two ends of the bowstring are connected with the two pulley assemblies. Each of the two auxiliary strings includes a first connection segment formed on a first end thereof, and each of the two auxiliary strings includes a second connection segment formed on a second end thereof. Two first connection segments of the two auxiliary strings are connected with the two pulley assemblies. The cable slide is slidably received in the slot and includes two opposite first fixing portions and two opposite second fixing portions.