Finger-Mounted Mechanical Counter for Hands-Free Counting
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Solution Overview
Problem
Conventional mechanical counting devices are typically handheld, restricting the user's ability to perform other activities while counting, as they require the hand to be used for holding and operating the device.
Innovation Solution
A finger-mounted mechanical counter that allows users to wear the device on their finger, enabling counting through a dial rotation mechanism with annular wheels and pinion gears, allowing for independent digit incrementation and display of counts between 000 and 999.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the counter is designed as a handheld device with a housing held in the palm, then the counter can be operated reliably, but the user's ability to perform other activities with that hand is restricted
Solution Approach 1:
The counter is transitioned from a palm-held device to a finger-mounted device, changing the dimensional scale and mounting location. The housing is designed to fit over a finger rather than being held in the palm, allowing the hand to remain free for other activities while maintaining reliable operation through the finger-mounted configuration
Solution Approach 2:
The counter is divided into modular components including a housing, dial, annular wheels, and pinion gears that can be assembled and disassembled. The housing includes finger engagement features that segment the interaction between the device and user anatomy, allowing reliable operation while maintaining hand freedom
2Volume of moving object
If the counter is made compact to fit on a finger, then the user can wear it freely, but the internal mechanism space is limited
Solution Approach 1:
The annular wheels are nested within the housing in a concentric arrangement, with each wheel positioned inside the annular space defined by the housing walls. The pinion gears are positioned to engage with the annular wheels within the same compact volume, achieving a space-efficient nested configuration that fits the complex mechanism within a finger-sized housing
Solution Approach 2:
The annular wheels and gears utilize circular and curved geometries that efficiently pack the mechanical components within the compact housing. The curved paths of the pinion gears engaging with the annular wheels optimize space utilization while maintaining the required mechanical functionality for counting operations
Data Source
AI summary
The finger-mounted mechanical counter is a numerical counter that may be worn on the finger of a user. First, second and third wheels each have a set of indicia formed thereon, each set of indicia being a circumferentially arrayed set of integers, such as a continuous range from 0 to 9. The first, second and third wheels are rotatably mounted within a housing having corresponding first, second and third slots formed therein for display of the corresponding indicia. The housing defines a central passage which is adapted for receiving the finger of the user. After a full rotation of the first wheel, the second wheel is rotated by a single increment, and after full rotation of the second wheel, the third wheel is rotated by a single increment, allowing for consecutive counting from single digits to double digits to triple digits.