Portable Bow Press Pulley Axle Attachment
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Solution Overview
Problem
Existing bow press technologies for compound bows fail to effectively manage torsional forces and torque, often risking limb damage due to off-center force application, and are not portable or user-friendly for field maintenance.
Innovation Solution
A portable bow press comprising three separable, lightweight pieces: a loop assembly attaching directly to the pulley, a steel cable connection element with S-hooks for secure attachment, and a method to apply tension directly to the pulley axle without coupling to the bowstring, allowing for easy maintenance and minimizing torque on the limbs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a portable bow press attaches directly to the bowstring or limbs, then it can provide tension relief for maintenance, but it applies off-center forces that increase torque and risk limb damage
Solution Approach 1:
The patent introduces an intermediary attachment mechanism that connects to the pulley axle rather than directly to the bowstring or limbs. This intermediary point (the pulley axle) allows force application that is centered on the bow's rotational axis, eliminating off-center forces and torque while still providing the necessary tension relief for maintenance operations.
Solution Approach 2:
The bow press is divided into separable components including a press body, an attachment mechanism with S-hooks, and a cable system. This segmentation allows the device to be portable and easily applied to different bows while maintaining proper force application through the pulley axle connection point.
2Reliability
If a traditional vice bow press is used, then it can provide stable tension relief, but it is too large and heavy for field use
Solution Approach 1:
The bow press is designed as a separable device with multiple components that can be easily assembled and disassembled. The press body, attachment mechanism, and cable system can be stored separately and quickly deployed in the field, providing stable tension relief without the bulk of a traditional vice press.
Solution Approach 2:
The attachment mechanism uses movable S-hooks that can be easily engaged and disengaged from the pulley axle, allowing rapid setup and teardown in field conditions while maintaining stable force application during use.
3Object-affected harmful factors
If the bow press applies force to the pulley axle, then it maintains proper torque and reduces limb damage risk, but it requires precise attachment to the pulley
Solution Approach 1:
The pulley axle serves as an intermediary connection point that is inherently centered on the bow's rotational axis. By attaching to this pre-existing feature rather than requiring precise alignment of external reference points, the system automatically ensures proper torque management while simplifying the attachment process.
Solution Approach 2:
The attachment mechanism leverages the existing pulley axle structure to provide self-aligning force application. The S-hooks engage with the axle in a way that automatically centers the force application, eliminating the need for external alignment procedures or precision measurement.
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
The solution provides a stable, portable, and user-friendly bow press that effectively manages torsional forces, reduces the risk of limb damage, and allows for easy maintenance of compound bows in the field, maintaining tension as if the bowstring were drawn.
Implementation Method 1
The connection element is adapted to have a length that is less than the length of the free bowstring at brace height... maintaining tension as if the bowstring were drawn
Implementation Method 2
The first piece is a loop assembly that has a pin, bolt, or other mechanism to attach directly to a pulley... The axle is applied through first mounting anchor element 15 and the washers 4 and 5 and mounting anchor 15′ and are placed onto bolt shaft 23
Implementation Method 3
Two washer elements 4 and 5, preferably a hard polycarbonate material, rest between mounting anchors 15 and 15′ and slidably engage on axle 11
Data Source
AI summary
A portable bow press made of three distinct and separable parts. The first two parts contain loop assemblies made of steel wire formed into a U-shaped loop with the two ends connected via a bolt. The third part is a connection cable with S-hooks on either end that hook into the loop elements. The bolts in the loop assemblies are applied through tooling holes in pulleys on the limbs of a compound archery bow. The bow press is applied once the loop assemblies are in place. The limbs can be forced inward by drawing the bowstring creating enough slack for the connection cable to be hooked on either end to the loops. When the bowstring is released, the limbs are held by tension in the cable and loops to a point where they are closer than at brace height. When the bow press is applied, the bowstring is loose and maintenance can be applied to the bow, before disengaging the bow press.