Tacker Safety Device Ignition Spring Switch Activation
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Solution Overview
Problem
Conventional tacker safety devices face issues with fragile or deformed plastic extensions that fail to precisely activate the safety switch, especially when stapling thin objects, and lack index portions for accurate positioning, leading to potential damage and incorrect stapling.
Innovation Solution
A safety device with an ignition spring connected to the plastic tip of the rod, a U-shaped safety slide with index portions and a notch, and a recovery spring that absorbs impact to ensure precise activation of the safety switch and secure cable stapling, preventing damage and ensuring accurate positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a plastic extension is used to activate the safety switch, then the structure is simple and easy to manufacture, but the plastic extension becomes fragile or deformed after a period of time, failing to precisely activate the safety switch
Solution Approach 1:
The patent introduces an ignition spring as an intermediary component between the rod and the safety switch contact plate. The ignition spring replaces the direct contact mechanism of the plastic extension, serving as a mediator that reliably transmits the activation force to the safety switch while absorbing impacts during rod retraction, thereby resolving the reliability issue of the plastic extension.
Solution Approach 2:
The patent changes the material parameter from plastic to metal spring, fundamentally altering the mechanical properties of the activation component. The ignition spring provides elastic deformation capability and impact absorption, transforming the activation mechanism from a direct rigid contact to an elastic intermediary contact, thus improving reliability without sacrificing manufacturability.
2Measurement precision
If the rod displacement is limited for thin objects, then the stapling precision is improved, but the extension cannot move a sufficient distance to effectively activate the contact plate of the safety switch
Solution Approach 1:
The ignition spring acts as a mediator that amplifies the rod's limited displacement. When the rod moves a short distance for thin objects, the ignition spring compresses and stores elastic energy, then releases this energy to push the contact plate sufficiently to activate the safety switch, thus decoupling the rod displacement distance from the contact plate activation distance.
Solution Approach 2:
The ignition spring introduces dynamic elasticity to the system, allowing the activation mechanism to adapt to different object thicknesses. The spring's elastic deformation capability enables it to accumulate force over a short displacement and deliver a sufficient impulse to the contact plate, making the activation reliable regardless of the rod's limited movement distance.
3Speed
If the rod returns quickly after stapling, then the operation speed is improved, but the extension may hit the contact plate of the safety switch and even damage it
Solution Approach 1:
The ignition spring provides beforehand cushioning by positioning itself between the rod and the safety switch contact plate. During the rod's quick return, the compression spring absorbs the impact energy through elastic deformation, preventing the rod from directly hitting and damaging the contact plate, thus protecting the safety switch while maintaining fast operation speed.
Solution Approach 2:
The patent converts the harmful impact force during rod retraction into a beneficial elastic energy storage and release mechanism. The ignition spring uses the impact force to compress itself, storing elastic energy, then releases this energy to gently push the contact plate, transforming the potentially damaging direct impact into a controlled, cushioned activation that protects the safety switch.
4Device complexity
If no index portion is provided on the rod, then the device complexity is reduced, but the user cannot notice that the stapling position is not at the desired position
Solution Approach 1:
The patent uses visual index portions (such as colored marks or distinctive features) on the rod to indicate stapling position to the user. This visual feedback mechanism allows users to quickly identify whether the stapling position is correct without adding complex mechanical or electronic positioning systems, thus improving positioning accuracy while maintaining low device complexity.
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 ignition spring and recovery spring combination ensures reliable activation of the safety switch even for thin objects, while the index portions and notch provide accurate stapling positioning, preventing damage to the safety switch and ensuring secure cable stapling.
Implementation Method 1
An ignition spring is mounted to the plastic tip of the seat. A safety switch is located in the body and has a contact plate extending therefrom. The contact plate is pushed by the ignition spring to send a stapling signal when the rod is retracted back into the body.
Implementation Method 2
A recovery spring is mounted to the connection portion to provide a recovery force to the rod.
Data Source
AI summary
A safety device for tackers includes a safety slide slidably connected to the outlet of the tacker and the safety slide has a stop protruding from the inside thereof. The rod has one end contacts the stop and the other end of the rod has a plastic tip connected thereto. An ignition spring is connected between the plastic tip and a safety switch. A recovery spring is connected to another position of the rod to position the rod. The safety slide is slidably connected to grooves of the tacker. When the safety slide contacts against an object to be stapled, the rod is pushed by the stop and activates the ignition spring to activate the safety switch so as to reduce the impact of the rod and the safety switch.