Reusable Safety Pin Mechanism for BB Grenade Launcher
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Solution Overview
Problem
Conventional BB bullet launchers, shaped as hand grenades, face the issue of the safety pin being irretrievable after use, necessitating a design improvement for reuse.
Innovation Solution
A hand grenade design featuring two half shells with spiral bullet storage, a pressurized air mechanism, a steel ball valve system, and a magnetically controlled air passage to facilitate BB bullet discharge and allow for the safety pin's return to its original position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a conventional safety pin design is used in a BB bullet launcher, then the device can be safely stored, but the safety pin cannot be returned to its original position after use
Solution Approach 1:
The safety pin mechanism is divided into separate functional components: a removable safety pin, a pull ring, and a reset mechanism. The safety pin can be detached and reattached, while the pull ring remains as a separate element that can be reused to activate the device again.
Solution Approach 2:
The safety pin is designed to be discarded (removed) after use and then recovered (reattached) to the same device for subsequent uses. The pull ring serves as a reusable component that remains with the device, allowing the user to pull it again to remove the safety pin for another activation cycle.
2Device complexity
If a simple safety pin design is used, then the device structure remains simple, but the safety pin cannot be reused after being pulled out
Solution Approach 1:
The pull ring serves multiple functions: it acts as a gripping element for removing the safety pin, and it also serves as a reset mechanism indicator. After the safety pin is removed, the pulled ring remains in place, and for the next use, the user simply pulls the ring again to remove a fresh safety pin, eliminating the need to manually reset other components.
3Ease of operation
If the safety pin is designed to be removable for reuse, then reusability is improved, but the risk of accidental discharge increases
Solution Approach 1:
The pull ring acts as an intermediary element between the user's hand and the safety pin. Instead of directly gripping and pulling the safety pin itself (which could cause accidental removal), the user pulls the ring, which then pulls the pin through a controlled motion. This intermediary mechanism reduces the risk of accidental discharge.
Solution Approach 2:
The safety pin is designed to protrude through the pull ring in a way that prevents accidental removal. The pin must be pulled with sufficient force in a specific direction to overcome the retention mechanism, creating a preliminary barrier against unintended activation. Only deliberate pulling of the ring will remove the pin.
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 efficient launching of BB bullets while allowing for the safety pin's retraction, enhancing usability and practicality by allowing multiple uses without the need for replacement.
Implementation Method 1
a magnet in a bottom of the hollow cylinder, a rod having a lower portion in the hollow cylinder to engage with the magnet
Implementation Method 2
the intermediate, hollow, cylindrical member is filled with pressurized air
Data Source
AI summary
A hand grenade for launching BB bullets includes two half shells each including a spiral bullet storage and one half shell further including a discharge opening; a hollow, cylindrical base including a bottom recess, an air passage communicating with one bullet storage, and a valve at an end of the air passage; a steel ball on the recess to block the valve; a pressing assembly including a disc urging against the steel ball, a hollow cylinder extending upward from the disc, a magnet in the hollow cylinder, and a rod partially in the hollow cylinder to engage with the magnet; a hollow, cylindrical member threadedly secured to the cylindrical base; a cup-shaped cap threadedly secured to the cylindrical member and including two opposite projections on an inner surface and a bottom through hole with the rod passing through; and a switch including two opposite protrusions under the projections respectively.