Razor Blade Housing Eccentric Cam Linear Motion Control
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Solution Overview
Problem
Conventional razor cartridges with reciprocating linear movement of the blade housing experience inconsistent shaving performance due to varying degrees of linear movement based on pivoting angle and suffer from momentum loss and noise due to interference between side walls and the eccentric cam head.
Innovation Solution
A razor assembly design featuring a guide housing, drive receiving member, and blade housing with a drive transmission member that allows the blade housing to move in a second direction perpendicular to the first direction, utilizing an eccentric cam body and cam head to maintain consistent linear motion and control assembly tolerance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the blade housing is fixedly connected to the drive receiving unit to enable reciprocating linear movement, then hair cutting efficiency is improved, but the degree of linear movement becomes inconsistent depending on the pivoting angle
Solution Approach 1:
The drive receiving unit is divided into an upper wall and a lower wall that can move relative to each other in the shaving direction, while the blade housing remains fixed to the cartridge body. This segmentation allows the drive receiving unit to accommodate variable movement ranges due to pivoting without affecting the blade housing's cutting performance.
Solution Approach 2:
The patent changes the movement parameter of the drive receiving unit (upper and lower walls) to adapt to different pivoting angles. The walls are designed to move along guide rails, allowing the amplitude of linear movement to vary with pivoting angle while maintaining consistent blade housing position relative to the skin.
2Strength
If the razor cartridge is designed with side walls in the drive receiving unit, then structural support is provided, but the side walls interfere with the movement of the eccentric cam head causing momentum loss and noise
Solution Approach 1:
The interfering side walls are removed from the drive receiving unit. Instead, guide rails are provided on the cartridge body to constrain the movement of the upper and lower walls. This extraction eliminates the interference between side walls and the eccentric cam head, preventing momentum loss and noise while maintaining structural support through the guide rail system.
3Length of moving object
If the eccentric cam head moves with large amplitude, then linear movement range is increased, but assembly tolerance control becomes difficult
Solution Approach 1:
Guide rails act as an intermediary between the eccentric cam head and the drive receiving unit. The guide rails constrain the movement of the upper and lower walls along a predetermined path, allowing large amplitude movement while maintaining precise assembly tolerance. The guide rails mediate the relationship between the cam head's rotational movement and the linear movement of the walls.
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
The design ensures consistent shaving performance by maintaining constant linear motion of the blade housing regardless of pivoting angle, minimizing momentum loss and noise, and improving hair cutting efficiency by reducing tugging and enhancing cutting speed.
Implementation Method 1
a drive transmission member configured to transmit a driving force to the drive receiving member... utilizing an eccentric cam body and cam head to maintain consistent linear motion
Data Source
AI summary
A razor assembly includes a guide housing; a drive receiving member disposed on one side of the guide housing and movable in a first direction with respect to the guide housing; a blade housing disposed on another side of the guide housing; at least one shaving blade disposed at the blade housing; a razor handle extending from the guide housing; and a drive transmission member configured to transmit a driving force to the drive receiving member. The blade housing is configured to be moved with respect to the guide housing in a second direction that is not parallel to the first direction in response to movement of the drive receiving member in the first direction. The drive receiving member is further configured to be moved in the first direction with respect to the guide housing by the driving force transmitted from the drive transmission member.