Spoked Core Drill Support Assembly for Lower Weight and Deflection
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Solution Overview
Problem
Core drills used for drilling holes in hard materials like concrete and masonry are excessively heavy due to solid steel plates, making them difficult to handle, and lack easy access for clearing wedged material, leading to inefficiencies in operation.
Innovation Solution
A bolt-on drive assembly with a high-strength spoked reinforcer and disc configuration that reduces weight while maintaining structural integrity, featuring a removable fastener system and water stop disc to prevent fluid leakage, allowing for easier access to the drill chamber.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a solid steel plate is used to close the end of the core drill tube, then the structural strength and connection force are improved, but the weight of the core drill increases significantly
Solution Approach 1:
The solid steel plate is segmented into a spoked wheel structure with multiple radial spokes connecting the central hub to the outer rim. This segmentation maintains structural strength by distributing loads through multiple load-bearing elements while removing excess material from the non-load-bearing areas between spokes, significantly reducing the overall weight of the closed end assembly.
Solution Approach 2:
Instead of using a uniform solid plate throughout, the design applies material locally where needed - concentrating steel in the spokes, hub, and rim where structural strength is required, while leaving the areas between spokes hollow. This local quality approach optimizes the strength-to-weight ratio by placing material only in locations that contribute to load-bearing functions.
2Strength
If a solid steel plate is used to close the end of the core drill tube, then the connection strength is improved, but the deflection of the core drill increases
Solution Approach 1:
The spoked wheel structure segments the closed end into multiple rigid radial elements that resist bending moments more effectively than a solid plate of equivalent weight. The distribution of material along multiple radial spokes provides better resistance to deflection under load while maintaining connection strength at the hub and rim mounting points.
Solution Approach 2:
The design transitions from a two-dimensional solid plate to a three-dimensional spoked wheel structure with vertical height in the spokes. This adds a dimensional element that increases the moment of inertia and resistance to deflection without proportionally increasing weight, as the vertical dimension of the spokes provides structural rigidity.
3Ease of operation
If the closed end plate is made removable, then the ease of operation for clearing wedged material is improved, but the device complexity increases
Solution Approach 1:
The closed end assembly is segmented into separable components - the spoked wheel structure can be detached from the tube, allowing the cutting operator to remove the closed end plate and access the drill chamber interior. This segmentation enables easy clearing of wedged material while the modular design actually simplifies manufacturing and assembly compared to a monolithic solid plate.
Solution Approach 2:
The closed end transitions from a static permanent attachment to a dynamic removable component. The spoked wheel assembly can be attached or detached as needed, providing operational flexibility. This dynamic capability allows the system to adapt between two states: assembled for drilling operations and disassembled for maintenance and clearing operations.
Data Source
AI summary
A support assembly for a core drill which utilizes an improved high strength spoked reinforcer. The reinforcer may be removably mounted a core drill tube by fasteners. A drive connection is removably mounted and centrally located on an outer disc of a pair of discs. The drive connection is adapted to connect with a drive shaft to cause rotation of the tube. The assembly can also include a split in the disc when the high strength spoked reinforcer is not welded thereto, thereby providing a means of water control. The high strength spoked reinforcer can be a separate piece that is bolted to the disc or can be integrally formed as one piece therewith.