Setting Tool Braking Element for Early Recoil Deceleration
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing nail setting devices experience excessive recoil due to mis-setting or over-energy conditions, which can be dangerous and lead to injuries, and current solutions for controlling recoil are either ineffective or lead to premature wear and damage to the device.
Innovation Solution
A working tool with a pressure sensor and pressure spring system that transitions from driving mode to braking mode upon lifting from the surface, utilizing a braking element to decelerate the recoil through direct contact with the working piston, reducing recoil energy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a nail that is too long is used or driven directly into a hard surface, then the embedment depth is maintained, but the piston is slowed down considerably and excessive recoil occurs
Solution Approach 1:
The braking element is positioned to engage with the piston before the piston completes its full stroke, applying a counteracting force that prevents excessive recoil. This preliminary braking action occurs during the piston's deceleration phase, stopping the harmful recoil motion before it can cause damage or injury.
Solution Approach 2:
The braking element acts as an intermediary between the piston and the tool housing, absorbing and dissipating the excess energy from the piston's motion. This intermediary component prevents the direct transmission of harmful recoil forces to the tool structure and user.
2Loss of energy
If an elastic ring is used to cushion the piston, then piston energy is dissipated, but the ring body wears excessively and can be damaged if wear goes undetected
Solution Approach 1:
The braking element is designed as a wear-resistant component that can withstand repeated contact with the piston. Unlike the elastic ring that degrades over time, the braking element maintains its structural integrity and braking capability throughout the tool's service life, eliminating the reliability concerns associated with wear detection.
3Reliability
If the piston collar diameter is increased to prevent premature damage to the elastic ring, then the ring body is protected, but the device weight increases
Solution Approach 1:
The braking function is extracted from the elastic ring system and implemented as a separate, dedicated braking element. This separation allows the piston collar to maintain its original, optimized dimensions without needing to be enlarged for protective purposes, thereby avoiding the weight penalty.
4Object-generated harmful factors
If a pressure sensor and pressure spring system is used to transition from driving mode to braking mode, then recoil is reduced, but the device complexity increases
Solution Approach 1:
The pressure sensor and pressure spring system automatically detects the piston's deceleration phase and triggers the braking element engagement without requiring external control signals or complex electronic systems. The system serves itself by using the inherent pressure changes during piston operation to activate the braking function at the appropriate moment.
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 solution effectively minimizes recoil energy by decelerating the tool early in its recoil movement, enhancing safety and reducing wear on the device components.
Implementation Method 1
a pressure spring wherein the pressure spring is connected to the pressure sensor such that the pressure spring is tensioned in the driving mode and at least partially relaxed in the braking mode
Implementation Method 2
a braking element for reducing recoil energy in the working tool wherein the braking element is contacted with the pressure device
Data Source
Figure 1
Figure 2
Figure 3a~3b
AI summary
The invention comprises a working tool for driving a fastening element into a substrate, comprising: - a working piston guide having a cavity, - a working piston, wherein the working piston is movably arranged in the working tool along a setting axis within the cavity of the working piston guide, - a pressure device for transitioning the working tool from a driving mode to a braking mode, comprising: - a pressure sensor, wherein the pressure sensor is in direct contact with the substrate in the driving mode, - a pressure spring, wherein the pressure spring is connected to the pressure sensor such that the pressure spring is tensioned in the driving mode and relaxed in the braking mode, so that the pressure sensor is movable in a setting direction of the working tool, - a braking element for reducing recoil energy in the working tool, wherein the braking element is contacted with the pressure device.