Reciprocating Saw Wobble Plate Stroke Adjustment
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Solution Overview
Problem
Conventional reciprocating saws lack an efficient mechanism to adjust the stroke length of the spindle, limiting their versatility in cutting various materials and confined spaces.
Innovation Solution
A reciprocating saw design featuring a wobble plate and adjustment mechanism that allows the spindle to be reciprocated through different stroke lengths by varying the oblique angle of the wobble plate relative to the drive shaft, enabling both long and short cutting strokes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fixed stroke length mechanism is used, then the device structure is simple, but the adaptability to different cutting conditions is poor
Solution Approach 1:
The patent applies the dynamics principle by making the wobble plate angle adjustable rather than fixed. The adjustment mechanism allows the operator to change the wobble plate's angular position relative to the drive shaft, thereby dynamically changing the spindle's stroke length to adapt to different cutting conditions and material types.
Solution Approach 2:
The patent implements parameter changes by allowing the stroke length of the spindle to be varied through adjustment of the wobble plate angle. This changes the operational parameter of the reciprocating saw to match different cutting requirements, resolving the contradiction between fixed structure and adaptability.
2Adaptability or versatility
If a fixed oblique angle wobble plate is used, then the mechanism is simple, but the stroke length cannot be adjusted for different cutting needs
Solution Approach 1:
The wobble plate mechanism is made dynamic through the adjustment mechanism, which allows the plate's angular position to be changed during operation. This enables stroke length adjustment while maintaining the mechanical simplicity of the wobble plate design.
Solution Approach 2:
The adjustable wobble plate mechanism serves multiple functions: it maintains the simple mechanical advantage of a fixed-angle design while adding the capability to adjust stroke length for different cutting applications, making the mechanism universal for various cutting conditions.
3Productivity
If the wobble plate angle is increased for longer stroke, then cutting speed increases, but the saw cannot operate in confined spaces
Solution Approach 1:
The system allows dynamic adjustment of the wobble plate angle, enabling the operator to select between larger angles for high-speed cutting in open spaces and smaller angles for compact operation in confined spaces, thus resolving the contradiction between cutting speed and operational accessibility.
Solution Approach 2:
By changing the wobble plate angle parameter, the system can switch between different operational modes: larger angles provide longer strokes and higher productivity, while smaller angles provide shorter strokes for confined space operation, allowing optimization based on specific working conditions.
Data Source
AI summary
A reciprocating saw includes a motor and a drive shaft driven by the motor. The drive shaft defines a longitudinal axis. The reciprocating saw also includes a wobble plate coupled to the drive shaft. The wobble plate extends from the drive shaft at an oblique angle relative to the longitudinal axis. The reciprocating saw further includes a spindle coupled to and reciprocated by the wobble plate. The spindle has a stroke length. The reciprocating saw also includes an adjustment mechanism coupled to the wobble plate. The adjustment mechanism is operable to adjust the stroke length of the spindle.