Bit Holder Rear Aperture for Broken Bit Removal
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Solution Overview
Problem
Existing cutting bit holder assemblies do not facilitate easy removal and replacement of cutting bits, especially when they are bent or broken, due to limited access and structural constraints that prevent the bit from being easily dislodged without damaging the bit holder.
Innovation Solution
A cutting tool assembly with a bit holder design featuring a forward portion with an inclined front aperture and a rearward portion with a beveled surface and larger rear aperture, allowing the cutting bit to be accessed and removed in any direction, including through the rear aperture, which is larger than the bit's shank diameter to accommodate broken bits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a conventional bit holder structure is used, then the cutting bit is securely mounted during operation, but the cutting bit cannot be easily removed when broken or bent
Solution Approach 1:
The bit holder is segmented into multiple access points: a front aperture for normal operation and a rear aperture specifically for bit removal. This segmentation allows the holder to maintain secure mounting during operation while enabling easy removal when needed by accessing the rear aperture.
Solution Approach 2:
The invention extracts the bit removal function from the front aperture and creates a dedicated rear aperture for this purpose. The rear aperture is specifically designed to allow extraction of broken or bent bits that cannot be removed through the front aperture.
2Strength
If the bit holder structure is made robust to withstand large torques and loads, then the cutting bit is securely held, but access to the bit for removal becomes difficult
Solution Approach 1:
The invention adds a dimensional aspect to bit access by creating a rear aperture that provides access from a different spatial direction. This allows the bit holder to maintain robust construction for withstanding torques and loads while enabling easy bit removal through the rear aperture without compromising structural strength.
3Manufacturing precision
If the bit holder is designed with tight tolerances for precise bit mounting, then the cutting bit is securely retained, but broken bits cannot be removed due to space constraints
Solution Approach 1:
The bit holder is segmented into functional zones: the front aperture area maintains tight tolerances for precise bit mounting and retention, while the rear aperture area provides generous clearance specifically for removing broken bits. This segmentation allows both precise mounting and easy repair operations.
Solution Approach 2:
Different parts of the bit holder have different qualities: the front aperture region has tight tolerances and precise geometry for secure bit mounting, while the rear aperture region has larger dimensions and more generous clearances specifically designed to accommodate broken bit removal tools and operations.
Data Source
AI summary
A cutting tool assembly including a bit holder having a forward portion, a rearward portion, and a generally planar mounting surface between the forward and rearward portions. The forward portion defines a front aperture having an axis inclined relative to the mounting surface, and the rearward portion defines a rear aperture open to the front aperture. A cutting bit is mounted in the front aperture and includes a rearward end accessible through the rear aperture of the bit holder rearward portion.