Nail Gun Locking Block Relocates Friction Stress to Extend Service Life
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Solution Overview
Problem
Pneumatic nail guns experience premature locking failure due to high friction between the pawl and driving ram, leading to reduced service life, as the contact position is easily worn, necessitating frequent repairs or replacement of parts.
Innovation Solution
The design relocates the joint locking points with maximum friction stress to a position between a locking block and a stopper with a larger design space, utilizing a reciprocating locking block with first and second locking portions, and a return spring to minimize wear and maintain effective locking, thereby extending the service life of the nail gun.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the pawl is used to lock the driving ram directly, then the locking function is simple and reliable, but the friction between the pawl and driving ram causes rapid wear and locking failure
Solution Approach 1:
The patent introduces a stopper as an intermediary component between the pawl and the driving ram. The stopper engages with the driving ram first, preventing direct contact and friction between the pawl and the driving ram. This intermediary mechanism reduces wear on the driving ram while maintaining reliable locking functionality through the stopper-pawl interaction.
2Strength
If the recess for the pawl is designed deeply, then the locking engagement is stronger, but the friction increases and causes rapid wear of the contact position
Solution Approach 1:
The stopper serves as a mediator that engages with the driving ram at a position that provides sufficient locking strength without creating excessive friction. By positioning the stopper's engagement point optimally, the patent achieves strong locking while minimizing wear on the driving ram's contact surface.
Solution Approach 2:
The locking mechanism is segmented into distinct functional components: the stopper for engaging the driving ram, the pawl for maintaining the locked state, and the return spring for resetting. This segmentation allows each component to perform its specific function efficiently, with the stopper handling the high-friction engagement and the pawl handling the maintenance function.
3Duration of action of stationary object
If multiple joint locking points are designed, then the service life is prolonged through stress dispersion, but the device complexity increases
Solution Approach 1:
The stopper acts as a single intermediary component that provides multiple benefits: it engages the driving ram, prevents direct pawl-contact friction, and works with the return spring to enable reliable locking and unlocking. This single intermediary component achieves stress dispersion and extended service life without requiring multiple complex locking points.
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
This design significantly reduces wear on the driving arm during unlocking, preventing locking failure and allowing the nail gun to be used for a longer period without the need for frequent repairs or replacements, thus prolonging its service life.
Implementation Method 1
the locking block is capable of abutting against the driving arm under the action of a return spring
Data Source
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AI summary
The present invention provides a nail gun, which belongs to the field of mechanical technologies, and solves a problem of how to prolong a service life of the nail gun. The nail gun comprises a housing and a driving arm capable, the housing is provided with a locking block and a middle piece capable, the middle piece is arranged between the locking block and the driving arm, and the middle piece is respectively provided with a first locking portion and a second locking portion capable of being pawled in the driving arm; the locking block is capable of abutting against the first locking portion and preventing the middle piece from moving relative to the housing to keep the second locking portion pawled with the driving arm, or the locking block is capable of releasing blocking so that the second locking portion is capable of moving and disengaging from the driving arm.