Crossbow Bolt Shock-Absorbing Mechanism
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Solution Overview
Problem
It is difficult to safely release the stored energy of a drawn crossbow without risking damage to the crossbow or injury to the archer, as existing mechanical aids do not allow for controlled 'un-drawing' or 'de-cocking', and shooting a conventional bolt without a target can result in loss or damage.
Innovation Solution
A shock-absorbing bolt with a viscoelastic mechanism or fluid-based system that dissipates kinetic energy through viscoelastic, viscous, or frictional forces, featuring a heavier and more rigid shaft, a forward flange with a larger transverse area, and a tapered tip to reduce penetration and recoil upon impact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a conventional bolt is shot to release stored energy, then the energy is dissipated, but the bolt is lost or damaged upon striking an obstruction
Solution Approach 1:
The patent incorporates a shock-absorbing mechanism within the bolt structure that activates upon impact. This mechanism includes a shock-absorbing element (such as a spring, elastomer, or fluid damper) positioned to absorb and dissipate the kinetic energy of the bolt before it can cause damage to the bolt itself or surrounding objects, thereby protecting the bolt's integrity while still releasing the stored energy
Solution Approach 2:
The shock-absorbing mechanism acts as an intermediary between the bolt's kinetic energy and the target or obstruction. Instead of the bolt directly transferring all its energy to the target (which would cause damage), the shock-absorbing mechanism mediates this energy transfer by absorbing and gradually dissipating it, allowing the bolt to release energy safely without suffering damage itself
2Ease of operation
If mechanical aids are used to draw the crossbow, then drawing becomes easier, but controlled un-drawing or de-cocking is not enabled
Solution Approach 1:
The patent designs the mechanical aid system with dynamic characteristics that allow it to function in both forward (drawing) and reverse (de-cocking) directions. The mechanism includes movable components such as cranks, pulleys, or levers that can be operated bidirectionally, enabling the user to both draw the crossbow with assistance and safely control the release of stored energy in reverse, thus providing both ease of operation and adaptability
3Object-affected harmful factors
If the bolt is shot into a safe area, then energy is released safely, but the bolt is lost due to long range or damage upon striking
Solution Approach 1:
The shock-absorbing mechanism is pre-installed in the bolt to cushion against impact damage before the bolt can be lost or severely damaged. This allows the bolt to be used for safe energy release while maintaining its integrity for potential reuse, reducing both harm and material loss
4Productivity
If a lighter bolt is used, then the crossbow operates more efficiently, but the bolt penetrates deeper and causes more damage upon impact
Solution Approach 1:
The shock-absorbing mechanism compensates for the increased penetration and impact effects of lighter bolts by providing cushioning upon impact. This allows the use of lighter, more efficient bolts while mitigating the harmful effects of their deeper penetration and greater impact force through the integrated shock-absorbing elements
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
Enables safe release of stored energy by dissipating kinetic energy upon impact, reducing the risk of damage or injury, and allowing repeated use without significant damage to the bolt or target.
Implementation Method 1
The shock-absorbing mechanism can include a viscoelastic member and at least one movable member. Acceleration or deceleration of the bolt results in movement of the movable member that deforms the viscoelastic member, thereby dissipating at least a portion of the kinetic energy of the bolt.
Implementation Method 2
the shock-absorbing mechanism can include a hollow cylinder, a piston reciprocally movable within the cylinder and dividing the cylinder into first and second chambers, a fluid in the first and second chambers, and one or more channels or orifices arranged to permit restricted fluid flow between the first and second chambers. Acceleration or deceleration of the bolt results in movement of the piston within the cylinder and concomitant viscous flow of the fluid between the first and second chambers through the one or more channels or orifices, thereby dissipating at least a portion of the kinetic energy of the bolt.
Implementation Method 3
The shock-absorbing mechanism is arranged so that, upon acceleration or deceleration of the bolt, kinetic energy of the bolt is dissipated by viscoelastic, viscous, or frictional forces within the bolt.
Data Source
AI summary
A shock-absorbing bolt for a crossbow comprises a shaft, a forward flange, and a shock-absorbing mechanism coupled to the shaft or the forward flange. The forward flange is coupled to a forward end of the shaft and has a forward surface with a transverse area that is greater than about three times larger than a transverse area of the shaft. A tapered tip can be attached to and protrude from the forward surface of the forward flange. The shock-absorbing mechanism is arranged so that, upon acceleration or deceleration of the bolt, kinetic energy of the bolt is dissipated by viscoelastic, viscous, or frictional forces within the bolt.