Expanded-Diameter Hole Drilling with Visible Stopper Feedback
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Solution Overview
Problem
The formation of an expanded-diameter hole portion in existing hole drilling devices is not visually recognizable from the outside of the drilling object, making it difficult for workers to confirm completion of the drilling process.
Innovation Solution
A hole drilling device with a stopper that contacts the drilling object's surface, allowing visual confirmation of the expanded-diameter hole formation, featuring a cutter with cutting bits that protrude laterally from tapered surfaces and a shank with a rotation motor, enabling the formation of an expanded-diameter hole portion at the inner bottom of a mounting hole.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Difficulty of detecting and measuring
If a conventional hole drilling device is used to form an expanded-diameter hole portion, then the drilling function is achieved, but the completion of the expanded-diameter hole formation is not visually recognizable from the outside
Solution Approach 1:
The patent applies a visual indication mechanism where the stopper's position relative to the shaft provides visual feedback. When the stopper contacts the drilling object surface, it indicates the expanded-diameter hole formation is complete. This uses visual detection (color/position changes) rather than complex measurement systems.
Solution Approach 2:
The stopper acts as an intermediary element between the cutting bit and the operator. It translates the internal drilling process state into an externally visible signal, allowing the operator to detect completion without directly observing the hidden expanded-diameter hole formation.
2Manufacturing precision
If the cutting bit protrudes laterally from the tapered surface to form the expanded-diameter hole, then the expanded-diameter hole portion is formed, but the formation completion cannot be visually confirmed
Solution Approach 1:
The stopper provides visual feedback about the drilling process state. When the cutting bit has protruded sufficiently to form the complete expanded-diameter hole, the stopper contacts the surface, providing positive feedback that the manufacturing precision requirement has been met.
Solution Approach 2:
The stopper serves as a mediator that translates the precise positioning of the cutting bit (which forms the expanded-diameter hole) into an externally observable signal, allowing verification of manufacturing precision without direct measurement of the hole itself.
3Ease of operation
If the stopper is positioned to contact the drilling object surface for visual indication, then visual confirmation is achieved, but the device structure becomes more complex
Solution Approach 1:
The visual indication is achieved through simple positional changes of the stopper relative to the shaft, creating a visible signal without requiring complex indicators or additional systems.
Solution Approach 2:
The stopper's contact with the surface automatically provides the visual indication of completion. The device self-indicates its operational state through the mechanical positioning of the stopper, eliminating the need for external monitoring systems.
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 workers to visually verify the completion of the expanded-diameter hole formation from the outside, enhancing the efficiency of the drilling process by recognizing the stopper's contact with the drilling object's surface.
Implementation Method 1
a compression spring (5) provided between the shaft (2) and the shank (4), and biasing the shaft (2) in the forward direction and the shank (4) in the rearward direction
Implementation Method 2
tapered surfaces (25) formed on the inner side of the expanded-diameter guide block (22); two cutting bits (30) provided on the front end portion of the cutter (3) and laterally sliding on the respective tapered surfaces (25)
Data Source
Figure 1
Figure 2~3
Figure 4
AI summary
A hole drilling device (1) for forming an expanded-diameter hole portion at an inner bottom part of a mounting hole (9) includes: a shaft (2) including a contact surface (23) and a tapered surface (25), the contact surface (23) being formed on a front end portion of the shaft (2) and coming into contact with the inner bottom part of the mounting hole (9), the tapered surface (25) being formed on a side surface of the front end portion of the shaft (2) and expanding in diameter toward the contact surface (23); and a cutter (3) including a stopper (33) provided on a side surface of the cutter (3), the stopper (33) coming into contact with a surface of a drilling object (91), the cutter (3) including a cutting bit (30) formed on a front end portion of the cutter (3), the cutter (3) being fitted to the shaft (2) such that the cutter (3) is slidable in a forward-rearward direction, the cutting bit (30) contacting the tapered surface (25) and protruding laterally from the tapered surface (25) when the cutter (3) slides forward. The cutter (3) is movable between a first position and a second position. When the cutter (3) is in the first position, the contact surface (23) is in contact with the inner bottom part of the mounting hole (9), and the stopper (33) is away from the surface of the drilling object (91). When the cutter (3) is in the second position, the cutter (3) has been pushed in forward from the first position, the cutting bit (30) has protruded laterally from the tapered surface (25), and the stopper (33) is in contact with the surface of the drilling object (91).