Elevating Table Vibration Lock via Brake Wheel and Stop Block
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Solution Overview
Problem
Conventional carpentry elevating devices experience precision issues due to vibration-induced displacement of the elevating board, affecting the accuracy of cutting depth.
Innovation Solution
An elevating device with a brake wheel and stop block mechanism, utilizing an eccentric axle and torsion spring to securely lock the chain wheels and threaded members, preventing rotation during vibration and allowing precise positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the elevating device uses threaded members and chain wheels to adjust the height of the cutting tool, then the elevation position can be changed, but vibration from the electric shaper causes rotation of the threaded members and displacement of the elevating board, affecting cutting depth precision
Solution Approach 1:
The brake wheel is preliminarily positioned to engage with the chain wheel, creating a pre-existing blocking force that prevents vibration-induced rotation. The stop block with eccentric axle is preliminarily arranged to contact the brake wheel, establishing a preliminary constraint system that counteracts harmful vibrations before they can cause displacement.
Solution Approach 2:
The brake wheel acts as an intermediary component between the chain wheel and the stop block. It transfers the blocking force from the stop block to the chain wheel, preventing direct contact and allowing for a more effective vibration resistance mechanism. The eccentric axle serves as another intermediary, converting rotational motion into linear blocking motion.
2Manufacturing precision
If a blocking mechanism is added to prevent vibration-induced rotation, then cutting depth precision is improved, but the device complexity increases with additional components like brake wheel, stop block, and eccentric axle
Solution Approach 1:
The brake wheel is merged with the chain wheel assembly, sharing the same mounting structure and operating in close proximity. The stop block and eccentric axle are combined into a single integrated blocking unit that works together as one system. This merging reduces the number of separate components and simplifies the overall structure while maintaining precision.
Solution Approach 2:
The brake wheel serves multiple functions: it acts as a blocking element to prevent rotation, a transmission element to transfer force, and a positioning element to maintain the elevating board at the desired height. The eccentric axle provides both the blocking motion and the mechanical advantage needed to overcome vibration forces. This multi-functionality reduces the need for additional specialized components.
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 ensures the elevating table remains firmly positioned at the adjusted height, preventing unintended movement due to vibration, thus maintaining precise cutting depth accuracy.
Implementation Method 1
A torsion spring is mounted on the eccentric axle and has two legs having an angle therebetween. The two legs are respectively hooked to two stop pins, wherein one of the stop pins is connected to the stop block and the other one of the stop pin is affixed to the underside of the elevating table, so that the stop block is biased by the resilient pushing force of the torsion spring
Implementation Method 2
The stop block has an end connected with a longitudinal eccentric axle which has a top portion rotatably connected to the elevating table and an eccentric portion formed at a lower end of the eccentric axle. When the eccentric axle rotates an angle in one direction, the stop block is driven to contact against the brake wheel
Data Source
AI summary
A blocking arrangement for preventing the elevating table from moving includes a platform with four threaded stems extending downwardly from the underside of the platform. Each threaded stem has a threaded member and a chain wheel screwed thereon. A chain is trained about the four chain wheels so as to drive the chain wheels and the threaded members to elevate the elevating table. A brake wheel is securely mounted to the chain wheel of one of the threaded stems. The blocking arrangement includes a stop block which is movably connected beneath the elevating table so as to be in contact with the brake wheel to set the predetermined height of the elevating table to prevent any movement due to vibration.