Fastener Driver Jack Assembly for Stable Torsion Transmission
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Solution Overview
Problem
Existing nailers suffer from low transmission efficiency, unreliable transmission, and unreasonable product size due to various jacking mechanisms, such as rack-and-pinion-like jacking and gear cam jacking.
Innovation Solution
A fastener driver with a housing, driving mechanism, emission mechanism, and guide members that utilize convex arc-shaped protruding portions and cylindrical protruding shafts for stable torsion output, reducing friction and shock, and a support frame between guide members to avoid interference and increase nailing force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional jacking mechanisms (rack-and-pinion, gear cam, lead screw) are used, then the nailer can achieve basic nailing function, but transmission efficiency is low and transmission reliability is poor
Solution Approach 1:
The patent employs a convex arc-shaped protruding portion on the jack assembly that engages with a cylindrical protruding shaft on the support frame. This curved surface contact design ensures continuous smooth transmission of torsion from the driving mechanism to the emission mechanism, eliminating the discontinuous engagement and impact loads characteristic of traditional rack-and-pinion or gear cam mechanisms. The arc-shaped contact surface distributes transmission forces evenly, improving both transmission efficiency and reliability.
Solution Approach 2:
The patent introduces a jack assembly with convex arc-shaped protruding portions as an intermediary transmission element between the driving mechanism and the emission mechanism. This intermediary component translates rotational torsion into linear motion of the piston through smooth engagement with the cylindrical protruding shafts, avoiding the direct mechanical engagement of traditional jacking mechanisms and thereby improving transmission smoothness and reliability.
2Volume of moving object
If compact design is pursued, then product size is reduced, but transmission stability and shock reduction are compromised
Solution Approach 1:
The convex arc-shaped protruding portion creates a continuous curved contact surface with the cylindrical protruding shaft, transforming discrete impact loads into continuous smooth forces. This curved engagement geometry maintains transmission stability while allowing for a more compact overall design compared to traditional mechanisms that require larger clearance and more robust components to handle impact loads.
Solution Approach 2:
The patent employs multiple pairs of protruding shafts and protruding portions that engage sequentially during the transmission cycle. This dynamic multi-point engagement ensures continuous stable transmission throughout the motion cycle, distributing loads over time and space, which maintains transmission stability in a compact configuration without requiring oversized single-point engagement components.
3Force
If multiple pairs of protruding shafts and protruding portions are used, then nailing force is enhanced, but device complexity increases
Solution Approach 1:
The patent divides the transmission force generation into multiple independent pairs of protruding shafts and protruding portions. Each pair acts as an independent force-generating element, and their combined effect produces enhanced nailing force. This segmentation allows the complex force multiplication function to be achieved through simple, modular repeated elements rather than a single complex mechanism.
Solution Approach 2:
The patent combines multiple pairs of protruding shafts and protruding portions into a single integrated jack assembly structure. The support frame with multiple cylindrical shafts and the jack assembly with multiple arc-shaped portions work together as a unified transmission system, merging the function of multiple force-generating elements into one cohesive component set that enhances nailing force without proportionally increasing overall 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
Ensures stable and efficient torque transmission, reduces product shock, prolongs service life, and enhances nailing force without increasing the product's size or cost, providing a comfortable user experience.
Implementation Method 1
the protruding portions and the protruding shafts cooperate with each other to transmit torsion output by the driving mechanism to the emission mechanism. Due to convex arc shapes of the protruding portions, acting forces received by the protruding portions and the protruding shafts in a relative motion process of the protruding portions and the protruding shafts is always in an arc and cylindrical surface contact state.
Data Source
AI summary
A fastener driver including a housing, a driving mechanism located in the housing, an emission mechanism, a first guide member and second guide members is provided. The emission mechanism includes a piston, a driver firing pin attached to the piston, a bias mechanism and a jack assembly. The bias mechanism is provided with a first end portion supported in the piston and a second end portion supported by a head portion. The jack assembly is operated by the driving mechanism to enable the piston and the driver firing pin to move from the second position to the first position against a bias force of the bias mechanism. The first guide member movably supports the piston. The second guide members movably support a support frame. The second guide members are positioned between the first guide member and the jack, and disposed in parallel to the first guide member.