Adjustable Crossbow Stock With Locking Insert Mechanism
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Solution Overview
Problem
Conventional crossbows are bulky and difficult to store or carry, and their constant stock length is not suitable for all users, as evidenced by the compact crossbow's length still being a problem for some users.
Innovation Solution
An adjustable stock assembly comprising a fore-end stock, a butt stock, and a lock, where the butt stock is movably connected to the fore-end stock through a chamber and slot system, allowing for adjustable length by using an insert and lever mechanism to secure the butt stock in various positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the crossbow is made compact to reduce size for easier storage and carrying, then the overall size is reduced, but the stock length becomes unsuitable for some users
Solution Approach 1:
The stock is divided into a fore-end stock and a separate butt stock that can be adjusted relative to each other. The butt stock can be moved to different positions and locked in place using a lock mechanism, allowing the stock length to be customized while maintaining a compact overall design when not in use.
Solution Approach 2:
The stock assembly transitions from a fixed, static design to a dynamic, adjustable configuration. The butt stock can be moved along the fore-end stock and secured at multiple positions, enabling the crossbow to adapt to different user preferences while maintaining compact storage capability.
2Ease of manufacture
If the stock length is made constant to simplify the design, then the manufacturing is easier, but the crossbow is not suitable for all users
Solution Approach 1:
The stock is segmented into adjustable components (fore-end stock and butt stock) that can be independently positioned and locked, providing customization capability while maintaining relatively simple manufacturing processes for each individual component.
3Adaptability or versatility
If the crossbow is made bulky to accommodate a longer stock for all users, then the adaptability is improved, but the crossbow becomes troublesome to store or carry
Solution Approach 1:
The stock assembly uses a dynamic adjustment mechanism where the butt stock can be repositioned and locked at different locations along the fore-end stock. This allows the crossbow to provide extended stock length when needed while maintaining a compact form factor for storage and carrying when the adjustment is not required.
Data Source
AI summary
A stock assembly of a crossbow includes a fore-end stock, a butt stock, and a lock. The fore-end stock includes a slot in a lateral face and a chamber in a rear face. The slot is in communication with the chamber. The butt stock includes an insert movably inserted in the chamber, a shoulder contact portion formed at an end of the insert out of the chamber, and recesses in a lateral face of the insert. The lock is pivotally connected to the fore-end stock and insertable in a selected one of the recesses through the slot.