Telescopic Rod Rack and Pinion Positioning
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Solution Overview
Problem
Existing telescopic rods in the renovation and remodeling tool industry often experience issues with the expansion block and limit button becoming stuck or damaged, leading to a shortened service life and impaired functionality.
Innovation Solution
A multi-functional telescopic device with a three-layered structure featuring a front hand grip cylinder, middle hand grip cylinder, and rear cylinder, utilizing a rack and teeth structure mechanism with a wire rope transmission system for stepless displacement and bi-directional telescoping, allowing for secure positioning and length adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If expansion block and limit button mechanisms are used for telescopic rod positioning, then the structure remains simple, but the components become stuck or damaged during use, shortening service life
Solution Approach 1:
The patent replaces the traditional expansion block and limit button mechanical system with a rack and pinion gear mechanism. The pinion gear engages with the rack on the telescopic rod to provide precise positioning and locking, eliminating the sticking and damage issues associated with the old mechanical components while maintaining structural simplicity.
Solution Approach 2:
The patent introduces a wire rope as an intermediary element that connects the driving force to the telescopic rod. This wire rope transmission system allows for smooth, controlled extension and retraction without the direct mechanical contact that causes sticking and damage in traditional expansion block systems.
2Ease of operation
If traditional expansion block mechanisms are used, then the device structure remains simple, but the components become damaged, affecting functionality
Solution Approach 1:
The patent substitutes the problematic expansion block mechanism with a rack and pinion gear system that provides more reliable engagement and disengagement. The gear teeth on the rack interact with the pinion gear to ensure smooth operation and prevent the sticking and damage that plagues traditional expansion blocks, thereby improving both ease of operation and durability.
3Adaptability or versatility
If fixed-length telescopic devices are used, then the structure is simple, but the adaptability to different length requirements is limited
Solution Approach 1:
The patent transforms the fixed-length telescopic device into a dynamic, adjustable-length system using a rack and pinion mechanism. The rack is cut at an angle and works with the pinion gear to allow continuous length adjustment, enabling the device to adapt to various length requirements while maintaining a relatively simple overall structure.
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 device achieves stepless extension and retraction with secure positioning, enhancing the durability and usability of telescopic rods by preventing sticking and damage, and allowing for wide application in various tools requiring length adjustment.
Implementation Method 1
an innermost layer which comprises an extensible tube 8 provided inside the front hand grip cylinder element 1 and the middle hand grip cylinder element 2 capable of extending outside the front hand grip cylinder element 1 and comprising a threaded connecting head 5 at the front end 101, and a rack 7 at a top side thereof, wherein the front hand grip cylinder element 1 comprises a button 6 having a teeth structure arranged for engaging with the rack of the extensible tube 8
Implementation Method 2
a sliding movement of the extensible tube 8 for length extension or length shortening is driven through a movement of the middle hand grip cylinder element 2 by a transmission arrangement. The transmission arrangement comprises a position sleeve 13 fixedly connected inside the tail fastener 4; a drive plate 11 positioned inside the rear cylinder element 3, a left transmission guiding half cylinder member 10 and a right transmission guiding half cylinder member 22 at the innermost layer supported by the middle layer fixed sleeve element 9; a positioning sliding block 12 provided at the left transmission guiding half cylinder member 10 and the right transmission guiding half cylinder member 22 inside the front hand grip cylinder element 1; and a wire rope 18 having one end connecting to the drive plate 11 through the sliding block 12 and another end connecting to the wire rope fastening sleeve 14
Data Source
AI summary
A multi-functional telescopic device which includes a front hand grip cylinder element at a front end with a button, a middle hand grip cylinder element at a middle, a rear cylinder element at a tail end opposite to the front end, and a tail fastener; a middle layer fixed sleeve element connecting communicating with the middle hand grip cylinder element for sliding movement; an extensible tube comprising a threaded connecting head at a front end arranged for connecting to a tool head and a rack at a top side thereof, and is capable of sliding movement for length extension or length shortening initiated by a movement of the middle hand grip cylinder element, wherein the button is arranged for engaging with the rack at a fixed-length state and for disengaging with the rack at a length adjustment state.