Hole Coring System Lever Arm Mandrel Guide
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Solution Overview
Problem
Drilling large-diameter holes in concrete and similar materials is challenging due to the difficulty in maintaining drill bit precision, as existing systems tend to wobble or vibrate, and require bulky, heavy, and expensive equipment for stabilization.
Innovation Solution
A system that uses a mandrel secured to the concrete with anchor holes, a hollow drive shaft assembly with internal bearings for precise alignment, and high-speed rotation to maintain stability and accuracy, allowing for efficient drilling with reduced torque and improved hole quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional core drill bits are used for drilling large-diameter holes in concrete, then drilling capability is achieved, but the drill bit cannot be maintained precisely centered and tends to wobble or vibrate laterally
Solution Approach 1:
A pilot hole is drilled first to serve as a guide for the subsequent large-diameter core drill bit. This intermediary pilot hole acts as a mediator that provides a precise path for the larger drill bit to follow, preventing lateral wobbling and maintaining centering throughout the drilling operation.
Solution Approach 2:
The pilot hole is drilled in advance before the main drilling operation with the large-diameter core drill bit. This preliminary action creates a prepared pathway that ensures the subsequent large drill bit remains centered and stable during the actual hole formation process.
2Stability of the object's composition
If stabilizing frames are used to prevent drill bit lifting, then drill stability is improved, but the equipment becomes bulky, heavy, and expensive
Solution Approach 1:
The complex stabilizing frame structure is replaced by extracting only the essential stabilizing function, which is achieved through the pilot hole guide mechanism. This eliminates the need for bulky external framing while maintaining drill bit stability through the preliminary pilot hole pathway.
Solution Approach 2:
The pilot hole serves as an intermediary structure that provides stability and guidance without requiring external stabilizing frames. The pilot hole itself becomes the mediating element that prevents drill bit wandering and lifting, replacing the need for complex mechanical stabilization systems.
3Power
If high torque is applied to drill large-diameter holes, then drilling capability is achieved, but the drill bit cannot rotate at high speed and produces excessive vibration
Solution Approach 1:
The pilot hole is drilled first to create a precise pathway, which then allows the large-diameter core drill bit to rotate at high speeds with reduced torque requirements. The preliminary pilot hole preparation enables the main drilling operation to proceed more efficiently with better speed and less vibration.
Solution Approach 2:
The drilling process is segmented into two distinct stages: first drilling a small-diameter pilot hole, then following with the large-diameter core drill bit. This segmentation allows each stage to operate under optimal conditions, with the pilot hole providing guidance that enables high-speed rotation with reduced torque for the main drilling operation.
Data Source
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AI summary
A hole coring system (10) is provided that greatly stabilizes a tubular core drill bit (420) for drilling into concrete or other materials enabling large diameter holes to be drilled with a handheld tool. The drill bit (420) is guided by a mandrel (554) which is attached to the concrete. The mandrel (554) serves as a central guidepost that ensures that a relatively large diameter, tubular core drill bit (420) remains precisely centered relative to the guide mandrel (554). This enables the operator to use a commonly available tool to rotate the drill and apply drill pressure only. The motor (564) may rotate the drill bit (420) via a gear box (430). The gear box (430) may have a lever arm (600) which may be used to resist any torquing action of the gear box (430) due to the friction between the drill bit (420) and the concrete. Additionally, in the event the motor's housing is not fixed to the gearbox (420) and allowed to rotate, a brace (602) may be attached to the lever arm (600) which may be used to resist any torquing action of the motor's housing due to the friction between the drill bit (420) and the concrete.