Core Retaining Device for Concrete Drilling
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Solution Overview
Problem
Existing core drill bits often result in concrete cores falling and causing damage or injury during drilling, as they fail to effectively retain the core after separation from the material.
Innovation Solution
A core retaining device with a core attachment mechanism, a bearing, and a biasing arrangement that allows the drill bit to rotate while keeping the attachment mechanism static, using spools, cables, and a biasing mechanism to axially bias the core towards the distal portion of the drill bit, ensuring the core remains secured.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional core drill bit is used to drill a core from material, then the drilling operation can be completed, but the core may fall from the drill bit and cause damage or injury
Solution Approach 1:
The core attachment mechanism is pre-installed within the drill bit structure before drilling begins. The attachment mechanism includes pre-positioned arms and gripping elements that are ready to immediately secure the core upon its formation, preventing it from falling during or after the drilling operation
Solution Approach 2:
The core attachment mechanism acts as an intermediary device between the drill bit and the core. It includes intermediate components such as arms, gripping elements, and springs that mediate the interaction between the rotating drill bit and the extracted core, ensuring secure retention while allowing the drill bit to rotate freely
2Reliability
If the core attachment mechanism is made statically connected to the core, then the core can be securely retained, but the drill bit rotation may be restricted or impeded
Solution Approach 1:
The core attachment mechanism is segmented into multiple independent components including separate arms, gripping elements, and bearing assemblies. Each segment can move independently, allowing the drill bit to rotate freely while the attachment mechanism as a whole maintains static connection to the core through the bearing assembly
Solution Approach 2:
A bearing assembly serves as an intermediary between the rotating drill bit and the statically connected core attachment mechanism. The bearing allows relative rotation between the drill bit and the attachment mechanism, enabling the drill bit to rotate freely while the attachment mechanism remains stationary relative to the core
3Reliability
If a biasing arrangement is added to axially bias the core in the distal direction, then core retention is improved, but the device complexity increases
Solution Approach 1:
The biasing arrangement uses springs to create an axial force that counteracts gravitational force on the core. The springs are positioned to provide upward biasing force on the core, effectively counterbalancing the downward pull of gravity and preventing the core from falling during the drilling operation
Solution Approach 2:
The biasing arrangement incorporates spring elements that provide dynamic, adaptive force to the core retention system. The springs can compress and extend to accommodate variations in core size and weight, automatically adjusting the biasing force to maintain optimal retention without requiring complex mechanical adjustments
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 solution effectively prevents the concrete core from falling by maintaining it within the drill bit, enhancing safety and preventing damage, while allowing the drill bit to rotate freely, and includes additional features for safety backup and convenience during drilling.
Implementation Method 1
a bearing connected to the core attachment mechanism allowing the drill bit to rotate while the core attachment mechanism remains statically connected to the core
Implementation Method 2
a biasing arrangement operably connecting between the drill bit and the core via the bearing, axially biasing the core in the direction of the distal portion of the drill bit
Data Source
AI summary
A core retaining device is provided for use with a core drill bit, which is adapted to cut a core from a material such as concrete. The core retaining device includes a core attachment mechanism for releasably connecting the core retaining device to the core. A bearing is connected to the core attachment mechanism and allows the drill bit to rotate while the core attachment mechanism remains statically connected to the core. A biasing arrangement operably connects between the drill bit and the core via the bearing, and axially biases the core away from the material preventing the core from slipping from the drill bit. The core retaining device further includes at least one auxiliary safety feature such as extensions which extend laterally outward from the drill bit.