Eccentric Rod Mechanism for Compact Commodity Ejecting Device
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Solution Overview
Problem
Conventional daily commodity ejecting and retracting mechanisms, such as those using a rack and pinion, require a longer shaft tube dimension to accommodate the pinion, leading to a lack of compactness.
Innovation Solution
A mechanism with a rotatable operating portion and a rod portion that moves eccentrically within the shaft tube, allowing the daily commodity to protrude or retract without needing additional space at the rear end, utilizing a circular rotating knob and a biasing member to control the rod's movement, and incorporating a clip for compact design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a rack and pinion mechanism is used for ejecting and retracting the daily commodity, then the ejecting and retracting function is achieved, but the shaft tube dimension in the axial direction is elongated due to the need to accommodate the pinion protruding to the rear end side
Solution Approach 1:
Instead of having the rod portion rotate around a center line (conventional approach), the invention rotates the rod portion around an axis line that is eccentric from the center line. This inversion of the rotation axis position allows the rod portion to move within a compact space without protruding to the rear end side of the shaft tube, thereby reducing the shaft tube's axial dimension while maintaining the ejecting and retracting function.
Solution Approach 2:
The invention changes the dimensional arrangement by positioning the rotation axis of the rod portion eccentrically rather than concentrically. This dimensional shift allows the mechanism to achieve the same linear movement of the daily commodity while occupying less axial space, effectively transitioning from a conventional centralized rotation to an offset rotation that optimizes space utilization.
2Ease of operation
If the pinion is arranged to protrude to the rear end side of the shaft tube to engage with the rack, then the motion conversion from rotary to linear movement is achieved, but additional space must be secured at the rear end side of the operating portion
Solution Approach 1:
The invention inverts the conventional arrangement by placing the rotation axis of the rod portion eccentrically rather than having the pinion protrude to the rear end side. This allows the rod portion to achieve the necessary motion conversion while containing its movement within the shaft tube's axial boundaries, eliminating the need for additional rear end space.
Solution Approach 2:
The invention merges the functions of the operating portion and the rod portion into a more integrated structure. By having the rod portion rotate around an eccentric axis while being coupled to the operating portion, the mechanism achieves motion conversion without requiring separate space for the pinion to protrude, effectively combining the operational and transmission functions in a compact arrangement.
3Reliability
If a conventional rack and pinion structure is used, then the ejecting and retracting mechanism is established, but the overall device complexity increases due to multiple components
Solution Approach 1:
The invention extracts and eliminates the rack component from the conventional rack and pinion mechanism. By using a rod portion that rotates around an eccentric axis directly coupled to the operating portion, the mechanism achieves the same motion conversion function without requiring the rack, thereby reducing the number of components and simplifying the overall device structure while maintaining reliability.
Solution Approach 2:
The rod portion in the invention serves multiple functions: it acts as both the operating element and the motion conversion element. By rotating around an eccentric axis, it simultaneously converts rotary movement from the operating portion into linear movement for ejecting and retracting the daily commodity, eliminating the need for separate rack and pinion components and reducing 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
The mechanism allows for a more compact daily commodity ejecting and retracting device by eliminating the need for additional rear-end space, simplifying the structure, and ensuring stable operation with reduced parts, while maintaining the functionality of protruding and retracting the commodity.
Implementation Method 1
a rod portion which is coupled in one end portion thereof to the operating portion so as to be rotatable around a first axis line which is eccentric from the center line, and is coupled in the other end portion thereof to the daily commodity so as to be rotatable around a second axis line which is parallel to the first axis line
Data Source
AI summary
A mechanism of a daily commodity ejecting and retracting device includes an operating portion provided to rotate around a center line vertical to an axis line of a shaft tube in relation to the shaft tube between a first rotation position and a second rotation position. A rod portion is coupled within the shaft tube to rotate around a first axis line and is coupled to the daily commodity to rotate around a second axis line which is parallel to the first axis line. An eccentric position of the first axis line is set so that the daily commodity is immersed into the shaft tube via the rod portion when the operating portion is rotated to the first rotation position, and the daily commodity protrudes out of a leading end port of the shaft tube via the rod portion when the operating portion is rotated to the second rotation position.