Elastomeric String Suppressor for Crossbow Vibration Damping
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Solution Overview
Problem
Crossbows experience post-firing vibration of the bowstring, which is undesirable and needs to be minimized or eliminated.
Innovation Solution
A string suppressor for crossbows comprising an elastomeric pad with a string groove and cam groove, designed to engage with the crossbow riser and cam set, providing a clearance fit to absorb and reduce vibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the bowstring is discharged at high firing speeds, then the power and effectiveness of the crossbow is improved, but post-firing vibration of the bowstring increases
Solution Approach 1:
The elastomeric pad acts as an intermediary component between the bowstring and the crossbow structure. It absorbs and dampens the vibrational energy transmitted from the bowstring to the riser and cam system, thereby reducing post-firing vibration while allowing the bowstring to maintain its high-speed discharge capability
Solution Approach 2:
The elastomeric pad changes the physical parameters of the system by introducing a compliant, vibration-dampening material into the rigid mechanical system. This material parameter change allows energy absorption through elastic deformation, converting harmful vibrations into harmless thermal energy
2Stability of the object's composition
If the cam groove provides a clearance fit with the cam, then the string suppressor can effectively reduce vibration, but the precision of the fit between components is reduced
Solution Approach 1:
The elastomeric pad functions as a flexible element that can deform to accommodate the cam within the clearance groove. This flexibility allows the pad to maintain contact with the cam while absorbing vibrational energy, achieving vibration reduction without requiring precise tight tolerances between the cam and groove
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 string suppressor effectively minimizes post-firing vibration by engaging with the bowstring and cam system, reducing operational noise and stability issues.
Implementation Method 1
an elastomeric pad elongated along the first suppressor axis
Implementation Method 2
reduce, minimize or eliminate post-firing vibration
Data Source
AI summary
Provided is a string suppressor for a crossbow comprising a first suppressor axis; a first suppressor plane containing the first suppressor axis; an elastomeric pad elongated along the first suppressor axis to define a first pad end, and a second pad end opposite the first pad end along the first suppressor axis; wherein the first pad end has a feature adapted for engagement with a crossbow riser; and wherein the second pad end has a string groove formed therein, the string groove being coextensive with the first suppressor plane, and has a cam groove formed therein, the cam groove being coextensive with the first suppressor plane, the cam groove being wide enough to provide a clearance fit with an associated cam.