Electric Nail Driver Wedge Friction Transmission
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Solution Overview
Problem
Existing electric nail drivers face challenges in achieving sufficient striking force without requiring high working accuracy, as they often necessitate complex mechanisms with multiple V-shaped grooves and projections that demand precise alignment for effective operation.
Innovation Solution
A driving tool design where a driver support base with a V-shaped transmitting portion is clamped between two drive wheels, generating a large friction force by wedging, allowing for efficient transmission of rotational force without the need for high accuracy, and ensuring consistent peripheral speeds to prevent slippage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If multiple V-shaped grooves and projections are provided to increase friction resistance, then striking force is improved, but manufacturing precision requirements increase
Solution Approach 1:
The invention divides the drive wheel into multiple independent V-shaped groove portions around its circumference, allowing each groove to independently engage with the driver. This segmentation enables the system to achieve sufficient friction resistance through the cumulative effect of multiple grooves without requiring each individual groove to be precisely aligned, thereby reducing manufacturing precision requirements while maintaining or enhancing striking force.
Solution Approach 2:
The invention combines multiple V-shaped groove portions on the drive wheel with a single corresponding V-shaped transmitting portion on the driver. By merging multiple contact points (grooves) with one transmitting surface, the system achieves increased friction resistance and striking force without requiring high precision alignment between individual grooves, as they collectively engage with the single transmitting portion.
2Force
If V-shaped grooves and projections are meshed to increase contact area, then striking force is improved, but device complexity increases
Solution Approach 1:
The invention extracts the essential function of increasing contact area by providing multiple V-shaped groove portions on the drive wheel that can independently engage with the driver. This simplifies the overall mechanism by eliminating the need for complex meshing systems with corresponding projections, while still achieving increased friction resistance and striking force through the cumulative engagement of multiple grooves.
Solution Approach 2:
Instead of providing multiple V-shaped projections on the driver that would need to mesh with multiple grooves (increasing complexity), the invention inverts the approach by providing multiple grooves on the drive wheel that engage with a single V-shaped transmitting portion on the driver. This inversion reduces device complexity while maintaining the benefit of increased contact area and friction resistance.
3Reliability
If peripheral speeds of drive wheels vary at different positions, then slippage occurs, but transmission reliability decreases
Solution Approach 1:
The invention applies local quality by ensuring that the V-shaped groove portions are positioned and dimensioned such that their contact points with the driver's transmitting portion all lie at the same radial distance from the drive wheel's rotational axis. This local uniformity in radial position ensures consistent peripheral speed across all contact points, preventing slippage and maintaining reliable force transmission despite the varied angular positions of the grooves.
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 achieves a larger striking force than previous technologies without requiring high working accuracy, ensuring reliable transmission of rotational force and preventing slippage, thus enhancing the efficiency and usability of the electric nail driver.
Implementation Method 1
a large friction force can be achieved by clamping the single transmitting portion having the V-shape in cross section between the pair of left and right drive wheels
Implementation Method 2
the transmitting portion having a V-shape in cross section wedges between the drive wheels by pressing the driver support base by the press member
Data Source
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AI summary
Although in a driving tool operating by an electric motor as a drive source, according to a background art, there has been provided a technology of engaging projected streaks having V-shapes in cross sections with a plurality of V grooves in order to achieve a high striking force by efficiently transmitting a rotational force of a drive wheel to a driver support base, high working accuracy is needed in that case, and therefore, according to the invention, it is enable to achieve a large striking force without need of high working accuracy. A driver support base (20) is provided with a transmitting portion (20b) having a V-shape in cross section, the driver support base (20) is pressed by a press member (41) to cause the transmitting portion (20b) to wedge between a pair of left and right drive wheels (30, 30), so that a friction force is increased to achieved a large drive force of the driver support base (20).