Crossbow Cocking Rope Anchor Below Axis
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing crossbow cocking devices, especially those with rope anchors above the arrow/bolt axis, cause the bowstring to lift out of the desired shooting plane when the user applies force, leading to aborted cocking operations due to the resulting forces, particularly in smaller crossbows where the user leans farther over the crossbow.
Innovation Solution
A crossbow system with a rope anchor located below the shooting axis, allowing the cocking rope to engage the bowstring and be anchored to the stock, which maintains the bowstring in the desired plane during cocking, using a groove or protrusion for retention and multiple anchors for varying pull angles to accommodate different user positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the rope anchor is located at or above the arrow/bolt axis, then the cocking device can be simpler in structure, but the bowstring lifts out of the desired shooting plane causing cocking operation to fail
Solution Approach 1:
The patent inverts the conventional placement of the rope anchor from above or at the arrow axis to below the arrow axis. This inversion changes the direction of force application, allowing the cocking rope to pull the bowstring rearward without creating vertical forces that would lift the bowstring out of the shooting plane, thereby resolving the contradiction between simple structure and reliable operation
Solution Approach 2:
The patent changes the positional parameter of the rope anchor from above/at the arrow axis to below the arrow axis. This parameter change fundamentally alters the force vector geometry, enabling the cocking operation to succeed by preventing the bowstring from lifting while maintaining a relatively simple rope-based device structure
2Length of moving object
If the crossbow is reduced in size, then the overall length is smaller, but the user must lean farther over the crossbow causing forces that lift the bowstring out of plane
Solution Approach 1:
By inverting the rope anchor position to below the arrow axis, the patent enables smaller crossbows to be used successfully. The inverted anchor position creates a force geometry that remains stable even when the user leans farther over the compact crossbow, preventing the bowstring from lifting out of plane despite the changed user posture
3Adaptability or versatility
If the user leans farther over the crossbow, then accommodation of smaller crossbows is improved, but forces directed above the arrow axis lift the bowstring out of the shooting plane
Solution Approach 1:
The inverted rope anchor position below the arrow axis creates a force application geometry that is insensitive to user leaning position. Whether the user leans far over a small crossbow or maintains a standard posture, the anchor position ensures forces are applied in a way that maintains the bowstring in the shooting plane, thus accommodating various user positions without compromising reliability
Data Source
AI summary
In some embodiments, a crossbow system comprises a crossbow comprising a stock and a bow portion. The bow portion comprises a bowstring having a nocking point. The crossbow defines a shooting axis. The stock comprises a rope anchor located below the shooting axis. The crossbow system further comprises a cocking rope constructed and arranged to engage the bowstring and to be anchored to the rope anchor.