Shortened Base Block for Milling Tool Access
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Solution Overview
Problem
Existing base blocks in road milling and mining machinery lack sufficient access for removing bits or bit holders, as the retaining force is primarily located near the top, limiting tool access and retention efficiency.
Innovation Solution
A shorter base block with a corresponding shorter base block bore, combined with a 1½ inch length bit holder shank, provides additional space at the rear for improved tool access and retention, utilizing a semi-cylindrical angular slot and reduced radius extension to enhance access and retention forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a longer base block is used to accommodate standard 2⅜ inch bit holders, then retention force is maintained, but tool access to the rear of the base block is limited
Solution Approach 1:
The base block is segmented into two functional zones: a shortened retention zone (1½ inches) that maintains retention force, and an extended access zone (up to ⅞ inch) that provides tool access. This segmentation allows the base block to simultaneously achieve both retention and accessibility functions without requiring full standard length.
Solution Approach 2:
The invention extends tool access in a dimensional direction perpendicular to the primary retention axis by creating a rear extension or access port. This allows tools to reach the rear of the base block from a different spatial dimension, solving the access problem without increasing the primary length dimension that would compromise retention.
2Ease of operation
If a shorter base block bore is used to provide rear access, then tool access is improved, but retention force may be reduced
Solution Approach 1:
The base block bore exhibits local quality variations: the front portion (1½ inches) is optimized for retention with precise dimensional tolerances and surface finish, while the rear portion provides extended access. This localized differentiation allows the bore to simultaneously maintain retention force in the critical zone while providing access in the extended zone.
Solution Approach 2:
The base block is pre-configured with the shortened bore dimensions and rear access features during manufacturing, eliminating the need for field modification. The preliminary preparation of the bore geometry ensures that both retention and access requirements are met before the bit holder is installed.
3Adaptability or versatility
If standard 2⅜ inch bit holders are used, then compatibility is maintained, but shank length prevents full utilization of shortened base block
Solution Approach 1:
The invention extracts only the essential retention function from the full-length bit holder-shank assembly. By providing a shortened bore that accommodates just the necessary portion of the shank (1½ inches), the design separates the retention function from the full shank length, allowing standard bit holders to be used while effectively utilizing the shortened base block for access purposes.
Data Source
AI summary
An improved base block is disclosed for use mainly in road milling equipment, but also capable of use in trenching equipment and mining equipment. The base mounting portion is shortened in length from such prior art base blocks and has a reduced length device receiving portion extending therefrom that includes a bore therethrough. Rearwardly of the device receiving portion, the base mounting portion includes a reduced diameter semi-bore or curved wall capable of engaging a portion of the shank side wall of a standard length bit/holder shank. Additionally, an angled slot adjacent the rear of the device receiving bore increases access to the rear to aid removal of a bit/holder therefrom.