Articulating Jig Saw Drive Assembly Alignment
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Solution Overview
Problem
Existing power saws, such as jig saws and reciprocating saws, require complex bearing assemblies to maintain the plunger in alignment with the drive axis, limiting the ability to pivot the plunger while maintaining alignment with the drive axis.
Innovation Solution
An articulating drive assembly that includes a pinion gear, bevel gear, and crank pin, allowing the plunger to pivot with respect to the drive axis while maintaining alignment, eliminating the need for multiple bearing assemblies by using a gear housing and articulating housing that supports the plunger for pivotal movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple bearing assemblies are used to maintain plunger alignment with the drive axis, then alignment reliability is improved, but device complexity increases
Solution Approach 1:
The patent extracts and eliminates the need for multiple bearing assemblies by redesigning the drive mechanism. The articulating housing with pivotable connection allows the plunger to maintain alignment with the drive axis through geometric constraints rather than multiple bearing components, thereby reducing device complexity while preserving alignment reliability
Solution Approach 2:
Instead of using multiple bearings to force the plunger into alignment, the invention inverts the approach by using a pivotable articulating housing that naturally maintains alignment through its geometric configuration. The plunger is allowed to pivot freely while the housing geometry ensures it remains aligned with the drive axis throughout the pivoting range
2Stability of the object's composition
If the plunger is fixed in alignment with the drive axis, then alignment stability is improved, but operational flexibility deteriorates
Solution Approach 1:
The patent applies dynamics by making the articulating housing pivotable rather than fixed. The plunger can dynamically adjust its orientation through pivoting motion while the housing geometry dynamically maintains alignment with the drive axis throughout the range of motion, enabling both stability and flexibility simultaneously
Solution Approach 2:
The articulating housing serves multiple functions: it allows the plunger to pivot for operational flexibility while simultaneously maintaining alignment with the drive axis for stability. This single component performs both functions that would traditionally require separate mechanisms
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
Enables the plunger to be oriented at various angles relative to the drive axis without compromising alignment, simplifying the drive assembly and reducing the complexity of bearing systems, thus enhancing operational flexibility and efficiency.
Implementation Method 1
A pinion gear is supported by the gear housing that is coupled to the output shaft for rotation about the drive axis. A bevel gear is supported by the gear housing for rotation about a bevel axis perpendicular to the drive axis, the bevel gear being meshingly engaged with the pinion gear in the gear housing portion.
Implementation Method 2
An articulating housing is pivotably supported by the gear housing for pivotal movement about the bevel axis.
Data Source
AI summary
A power tool includes a motor housing having a motor configured to rotate an output shaft about a drive axis and a gear housing defining a gear compartment. A pinion gear is supported by the gear housing that is coupled to the output shaft for rotation about the drive axis. A bevel gear is supported by the gear housing for rotation about a bevel axis and includes a geared portion that is meshingly engaged with the pinion gear. A crank pin extends from the same side of the bevel gear as the geared portion at a position offset from the bevel axis. An articulating housing is pivotably supported by the gear housing for pivotal movement about the bevel axis. A plunger member is supported by the articulating housing for reciprocating movement along a reciprocating axis. The plunger member includes a yoke end portion coupled to the crank pin.