Rotary Hammer Bit Removal Adapter With Reverse Impact
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Solution Overview
Problem
Rotary hammers often fail to provide a reverse rotation function, leading to tool bits becoming stuck in matrix materials like concrete, especially when encountering rebar, causing project delays and design modifications.
Innovation Solution
An adapter is used to connect a pneumatically, hydraulically, or electrically powered impact wrench to the splined shaft of a rotary hammer tool bit, allowing both forward and reverse rotational impact to dislodge stuck bits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If rotary hammer is used for drilling through concrete and masonry with hammering action, then drilling capability through tough materials is improved, but tool bit removal capability deteriorates when bit becomes stuck
Solution Approach 1:
The patent applies reverse rotation to the stuck tool bit to remove it from the matrix material. The impact wrench connected through the adapter delivers rotational impacts in the opposite direction (counter-clockwise) to loosen and extract the bit that became stuck during forward drilling operations.
Solution Approach 2:
The adapter serves as an intermediary device that connects the impact wrench to the rotary hammer tool bit with a splined shaft. It transmits the rotational impact forces from the impact wrench to the tool bit, enabling reverse rotation without modifying the rotary hammer itself.
2Productivity
If rotary hammer provides hammering action for penetrating matrix material, then drilling efficiency is improved, but reverse rotation functionality deteriorates
Solution Approach 1:
The impact wrench provides multi-functionality by delivering both forward and reverse rotational impacts. When connected through the adapter to a rotary hammer tool bit, it can both tighten/secure the bit in forward rotation and extract the bit in reverse rotation, making the system versatile for multiple operations.
Solution Approach 2:
The adapter acts as a universal intermediary that allows the impact wrench to interface with the splined shaft of rotary hammer tool bits. This enables the impact wrench to perform multiple functions including bit installation, securing, and removal through appropriate rotation directions.
3Strength
If tool bit intersects rebar during drilling, then anchoring capability is improved, but tool bit binding and sticking worsens
Solution Approach 1:
The patent prepares for potential bit sticking by having the reverse rotation capability ready before it becomes a problem. When the bit does become bound in rebar, the immediate application of reverse rotational impact through the adapter and impact wrench prevents the binding from becoming a permanent stuck condition, allowing for easy extraction.
Solution Approach 2:
When the tool bit becomes bound and stuck in the rebar-reinforced concrete, the solution is to apply reverse rotation (counter-clockwise) through the impact wrench to loosen and extract the bit. This inverse action breaks the binding between the bit and the rebar-concrete interface.
4Strength
If limited working space exists around stuck tool bit, then structural integrity is improved, but bit removal difficulty worsens
Solution Approach 1:
The removal system is segmented into separate functional components: the adapter that interfaces with the tool bit, the impact wrench that provides rotational force, and the extension handle that provides leverage. This segmentation allows each component to be optimized for its specific function while working together in confined spaces.
Solution Approach 2:
The extension handle assembly adds a dimensional element by extending the leverage arm perpendicular to the axis of the stuck bit. This allows the operator to apply rotational force in a direction that may be more accessible in limited working space, rather than being constrained to only axial forces.
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
Enables effective removal of stuck rotary hammer bits by applying significant torque in both directions, reducing project delays and costs associated with stuck bits.
Implementation Method 1
The impact wrench provides the user the ability to apply repeated forward and reverse rotational impact with substantial torque to the rotary hammer tool bit to break it free.
Implementation Method 2
The impact wrench provides the user the ability to apply repeated forward and reverse rotational impact with substantial torque to the rotary hammer tool bit
Data Source
AI summary
An adapter which allows an impact wrench to be coupled to a tool bit for a rotary hammer and thereby rotate the tool bit in either direction. The adapter has a shaft member having a proximate end and a distal end. The proximate end has a rear facing axial opening configured to receive an anvil from the impact wrench. The distal end of the shaft member is coupled with a chuck assembly which is configured to releasably engage a shank of the tool bit and thereby rotate the tool bit. The adapter has a sleeve member which encloses the shaft member and allows the shaft member to rotate within the sleeve member. A handle member may be attached to the sleeve member, wherein the handle member may be utilized to apply a pulling force to the adapter to assist in withdrawal of the tool bit from a foundation.