Offset-Axis Swing Bridge for Compact Linear Oscillation Assembly
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Solution Overview
Problem
Existing swing bridges for converting rotary motion into oscillating motion in electrically driven devices, such as shavers, face challenges in assembly complexity, space requirements, and alignment of drive shafts, which complicates the integration with electric motors and cutter units.
Innovation Solution
A swing bridge design featuring an oscillating body with a slot and offset axes, where the slot is perpendicular to the plane and the drive shaft protrudes along a second axis, allowing for offset power transmission and simplified assembly, enabling linear oscillating motion while optimizing space usage within the device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the drive shafts are aligned in a common plane, then the swing bridge can convert rotary motion into linear oscillating motion, but the assembly becomes complex and requires precise alignment between the electric motor drive shaft and the swing bridge drive shaft
Solution Approach 1:
The patent introduces an offset between the first axis (through the slot) and the second axis (the drive shaft axis), breaking the symmetric common-plane alignment. This asymmetric offset arrangement allows the drive shafts to be non-collinear, simplifying assembly while maintaining motion conversion functionality through the offset mechanism
2Reliability
If the swing arms are designed to couple the oscillating body to the housing, then the oscillating body is constrained to move in one linear direction, but the swing arms become complicated to form and require plenty of space in the longitudinal direction
Solution Approach 1:
The patent transitions from a conventional swing arm design to a web structure where the web extends substantially perpendicular to the plane of the oscillating body. This dimensional change allows the coupling structure to extend in the thickness direction rather than the longitudinal direction, reducing longitudinal space requirements while maintaining motion constraint functionality
3Ease of manufacture
If an additional coupling comprising a slot is used to couple the swing bridge to the electric motor, then the swing bridge can be assembled, but the overall device complexity increases
Solution Approach 1:
The patent integrates the slot directly into the oscillating body itself, eliminating the need for a separate additional coupling component. The slot in the oscillating body directly receives and couples with the eccentrically rotatable drive pin, merging the coupling function into the existing oscillating body structure and reducing 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
This design simplifies the assembly process, reduces space requirements, and allows for efficient conversion of rotary motion into linear oscillating motion, enhancing the functionality and durability of electrically driven devices like shavers.
Implementation Method 1
The swing bridge comprises an oscillating body defining a plane, wherein the oscillating body comprises a slot arranged in the plane, and wherein a first axis extends through the slot perpendicular to the plane. The oscillating body comprises a drive shaft protruding perpendicular to the plane along a second axis, and at least one web extending at least substantially perpendicular to the plane.
Implementation Method 2
The first axis that extends through the slot perpendicular to the plane and the second axis are offset at least in one direction of the plane
Data Source
AI summary
The invention relates to a swing bridge for converting a rotary motion into an oscillating motion, especially into a linear oscillating motion, especially within an electrically driven device. The swing bridge comprises an oscillating body defining a plane. The oscillating body comprises a slot arranged in the plane, wherein a first axis extends through the slot perpendicular to the plane, and a drive shaft protruding perpendicular to the plane along a second axis.