Doweling Cart Pivot Mechanism for Aligned Concrete Slab Drilling
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Solution Overview
Problem
Drilling rebar or dowel holes in concrete slabs is difficult due to awkward body positions, difficulty in generating necessary force, and challenges in maintaining drill bit alignment, which leads to inefficiency and safety hazards.
Innovation Solution
A rebar hole doweling cart that pivotally holds a hammer drill near the ground, using a leveraged pushing force to maintain drill bit alignment and direction, allowing workers to stand while drilling, and accommodating different slab heights.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If workers kneel or lay down on the ground to drill holes, then they can access the drilling position, but their body position becomes awkward and unsafe
Solution Approach 1:
The cart serves as an intermediary device between the worker and the drilling task. It provides a stable platform that positions the drill bit at the correct height and angle, allowing the worker to stand upright while performing the drilling operation through the handle mechanism.
Solution Approach 2:
The invention changes the working dimension by elevating the drilling interface from ground level to a height accessible by a standing worker. The cart's height and angle adjustment mechanisms enable drilling at various elevations, transforming the vertical dimension of the working space.
2Productivity
If workers apply manual force to the drill, then they can drill holes, but they experience fatigue and difficulty generating sufficient force
Solution Approach 1:
The cart's nose plate engages with the ground to provide a counterbalancing reaction force. When the worker pushes the handle forward, the nose plate resists movement by engaging the ground surface, creating a leveraged mechanical advantage that multiplies the worker's input force and reduces fatigue.
Solution Approach 2:
The cart incorporates dynamic elements including the pivoting nose plate that adapts to ground conditions, and the handle mechanism that allows workers to apply force in a natural pushing motion. The system transitions between static (nose plate engaged) and dynamic (handle movement) states to optimize force application.
3Manufacturing precision
If the drill bit is held manually, then workers can position it, but maintaining alignment with the hole is difficult
Solution Approach 1:
The cart pre-positions the drill bit at the correct height and angle relative to the drilling surface before the actual drilling begins. The mounting assembly and nose plate geometry are designed to establish the proper drill bit orientation in advance, eliminating the need for continuous manual alignment adjustments during drilling.
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
Enhances drilling efficiency and safety by enabling workers to stand, generating sufficient force to cut through concrete, and maintaining drill bit alignment, reducing fatigue and injury risks.
Implementation Method 1
the nose plate is pivotally joined to the drill mounting assembly via a hinge to define a pivot point. As the worker strokes the handle forward, the nose plate rotates about the pivot point and into engagement with the ground to form a second pivot location
Implementation Method 2
the front end of the nose plate rotates about a first pivot location and into engagement with the ground to form a second pivot location. The cart allows a worker to remain standing and use the weight of their body to drill rebar or dowel holes
Implementation Method 3
The cart allows a worker to remain standing and use the weight of their body to drill rebar or dowel holes in concrete slabs near ground level
Implementation Method 4
hammer drill near the ground, taps the rebar hole to place the drill bit in a set aimed direction
Data Source
AI summary
The present application pertains to a rebar hole doweling cart to construct or repair sidewalks, driveways, roadways, curbs, floors and the like. The cart has a frame with wheels, an elongated upwardly extending riser with a handle, and a nose piece that pivotally supports a drill mounting assembly near the ground. The mounting assembly holds an electric hammer drill and its bit in an aimed direction. The cart is rolled forward to tap a hole in a concrete slab and place the bit in a set aimed direction. The cart handle is then pushed forward with the nose piece in gripping engagement with the ground to advance the drill bit forward to form the rebar hole in the slab. During this forward handle rotation, the drill mounting assembly simultaneously counter-rotates (pitch pivotal movement) relative to the nose piece to substantially maintain the drill bit in its set aimed direction.