Hole-Drilling Device with Movable Sleeve and Cam Mechanism
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Solution Overview
Problem
Existing hole-drilling devices for expanding diameter holes in drilling objects like concrete are complex and require multiple components, including a cam, hammering transmission rods, and a fixed drill bit body that cannot be replaced, leading to increased manufacturing costs and reduced efficiency.
Innovation Solution
A simplified hole-drilling device with a movable sleeve, a replaceable drill bit body, and a cam mechanism that allows the expanded diameter hole forming member to move laterally from the drill bit body, reducing the number of components and enabling easy replacement of the drill bit body, while incorporating a dust collection system to manage debris.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional hole-drilling device with cam and hammering transmission rods is used, then the expanded diameter hole portion can be formed by cutting, but the device structure becomes complex and manufacturing costs increase
Solution Approach 1:
The patent removes the complex cam and hammering transmission rods from the device structure. Instead, it uses a simple movable sleeve that directly contacts the drilling object surface to trigger the expanded diameter hole portion forming member to protrude laterally, thereby achieving the cutting function with a much simpler structure
Solution Approach 2:
The drill bit body is designed as a replaceable component that can be detached from the main body. This segmentation allows the drill bit body to be replaced when worn, simplifying maintenance and reducing overall device complexity while maintaining the expanded diameter hole portion formation capability
2Device complexity
If the drill bit body is fixed to the base, then the device structure is simplified, but the drill bit body cannot be replaced when worn
Solution Approach 1:
The drill bit body is designed as a separate, replaceable component that can be detached from the main body through a locking member. This segmentation maintains relatively simple device structure while enabling easy replacement of the wear-prone drill bit body, thus resolving the contradiction between structural simplicity and repairability
3Manufacturing precision
If drilling is performed in concrete, then holes with expanded diameter hole portions can be formed, but dust scattering occurs and cleanup is required
Solution Approach 1:
The patent converts the harmful dust generated during drilling into a collectible material by incorporating a dust collection bag. The dust that would normally scatter and require cleanup is instead captured and stored in the dust collection bag, transforming a harmful byproduct into a manageable resource
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 simplifies the device structure, reduces manufacturing costs, allows for easy replacement of drill bit bodies, and improves the drilling process by minimizing dust scattering and post-drilling cleanup through efficient dust collection.
Implementation Method 1
a first urging unit that urges the sleeve forward relative to the body
Implementation Method 2
a second urging unit that urges the expanded diameter hole portion forming member rearward relative to the drill bit body
Implementation Method 3
forms an expanded diameter hole portion in the inner part of the drilled hole by cutting
Data Source
Figure 1
Figure 2A~2B
Figure 3A~3B
AI summary
Provided is a hole-drilling device for drilling a hole with an expanded diameter hole portion, the hole-drilling device realizing a simplified structure. One example of the hole-drilling device for drilling a hole with an expanded diameter hole portion according to the present invention includes: a body (1) including a shank; a sleeve (3) attached to the body such that the sleeve is movable in a front-rear direction; a compression spring (6), which urges the sleeve forward relative to the body; a drill bit body (4) configured such that a proximal end portion of the drill bit body is inserted in a bottomed insertion hole (11) of the body, the drill bit body being attached to the sleeve such that the drill bit body is movable in the front-rear direction; an expanded diameter hole portion forming member (5) attached to a side surface of the drill bit body and configured such that a cutting bit (5a) protrudes laterally from the drill bit body when the expanded diameter hole portion forming member moves forward on the side surface; a compression spring (7), which urges the expanded diameter hole portion forming member rearward relative to the drill bit body; and a cam (8), which is rotatably supported by the body and whose both ends are contacted by an inner wall of the sleeve and the expanded diameter hole portion forming member. The expanded diameter hole portion forming member is configured to move forward on the side surface of the drill bit body owing to rotation of the cam (8) when the body moves forward relative to the sleeve.