Gas Combustion Striking Machine Lock-Out Bar Mechanism
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Solution Overview
Problem
Conventional gas combustion type striking machines face issues with cam deformation due to heat and damage from dust or sand, and the space constraint around the trigger due to the lock-out bar, affecting the machine's height and usability.
Innovation Solution
A gas combustion type striking machine that eliminates the need for a cam by using a safety lever and a rotatably connected lock-out bar attached to the trigger, allowing effective use of the upper trigger space and improving weight balance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a cam is used to hold the movable sleeve, then the machine can maintain a closed combustion chamber, but the cam may be deformed by heat or damaged by dust/sand
Solution Approach 1:
The patent removes the cam component from the system entirely, replacing it with a lock-out bar that is rotatably connected to the trigger. This extraction eliminates the harmful effects of heat and dust on the cam while maintaining the necessary function of holding the movable sleeve in the upper position to form a closed combustion chamber.
Solution Approach 2:
The patent replaces the cam-based mechanical system with a trigger-based rotational locking mechanism. The lock-out bar, when rotated to a specific position, directly engages with the movable sleeve to hold it in place, substituting the cam's function with a simpler, more robust mechanical arrangement that is less susceptible to environmental damage.
2Reliability
If a cam is used to hold the movable sleeve, then the combustion chamber can be sealed, but the machine height increases due to the cam space
Solution Approach 1:
By removing the cam component, the patent eliminates the space required for cam operation and positioning. The trigger-based lock-out mechanism utilizes existing structural spaces more efficiently, thereby reducing the overall machine height while maintaining the combustion chamber sealing function.
Solution Approach 2:
The patent transitions from a vertical cam-based holding mechanism to a rotational lock-out bar mechanism that operates in a different dimensional space. This rotational mechanism allows for compact positioning that reduces the vertical dimension (height) of the machine while still achieving the same functional result of holding the movable sleeve.
3Length of stationary object
If the lock-out bar is connected to the trigger, then the cam space is saved and machine height is reduced, but the upper portion of the trigger becomes a dead space
Solution Approach 1:
The trigger is designed to serve multiple functions: it operates the lock-out bar to hold the movable sleeve, and its upper portion is simultaneously utilized to accommodate the switch mechanism. This multi-functional design eliminates the dead space issue by making the trigger structure serve dual purposes, improving both compactness and operational efficiency.
Solution Approach 2:
The patent merges the trigger mechanism with the switch mechanism by positioning the switch in the upper portion of the trigger. This consolidation combines two previously separate functional elements into a unified structure, eliminating wasted space and improving the overall ease of operation by reducing the number of separate components.
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 enhances the machine's compactness, reduces the risk of cam-related issues, and improves operational efficiency by simplifying the structure and reducing the number of parts, while maintaining effective nail driving performance.
Implementation Method 1
a piston is provided vertically slidably within a cylinder disposed within a body... Combustion gas existing within the combustion chamber is ignited and combusted explosively to thereby actuate a driver together with the piston
Implementation Method 2
The movable sleeve is energized downwardly by a spring in such a manner that it is normally situated at its lower position
Implementation Method 3
Combustion gas existing within the combustion chamber is ignited and combusted explosively to thereby actuate a driver together with the piston
Data Source
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AI summary
In a gas combustion type striking machine, a combustion chamber (7) is opened and closed by moving a movable sleeve (6) in a vertical direction. A safety lever (23) is attached to a trigger (10), and a switch (26) is switched by being pressed by a switch lever (25) arranged to be engageable with the safety lever (23). A hold member (43) which is engageable with the movable sleeve (6) is rotatably connected to the trigger (10). A shaft (100) supporting a base end (43B) of the hold member (23) positions between a shaft (24) supporting the switch lever (25) and a cylinder (4) in a right-left direction which is perpendicular to the vertical direction.