Toolholder Locking System With Interlocking Protrusion
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Solution Overview
Problem
Existing toolholders on milling drums and rotary mixers experience rotational movement-induced frictional wear and loosening due to inadequate locking mechanisms, leading to maintenance challenges and reduced component longevity.
Innovation Solution
A mounting block assembly with a flighting portion, mounting portion, and protrusion that interlock with a toolholder's prongs and recess, inhibiting rotational movement and reducing frictional wear, while allowing for easy servicing by providing wedge channels for tool insertion and leverage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional mounting structure without interlocking features is used, then the toolholder can be easily installed and removed, but the toolholder experiences rotational movement causing frictional wear and loosening
Solution Approach 1:
The mounting block is segmented into functional portions: a flighting portion for drum engagement, a mounting portion for toolholder reception, and a protrusion for rotational locking. The toolholder includes prongs that interface with the protrusion. This segmentation allows each component to perform its specific function while maintaining overall simplicity.
Solution Approach 2:
The protrusion from the mounting block nests into the recess formed between the prongs of the toolholder, creating an interlocking relationship. This nested configuration provides rotational inhibition without requiring complex external locking mechanisms, resolving the contradiction between reliability and device complexity.
2Reliability
If an interlocking mechanism with protrusion and recess is implemented, then rotational movement is inhibited reducing wear, but the assembly and servicing complexity increases
Solution Approach 1:
The interlocking protrusion and recess features are extracted as simple geometric elements from the mounting block and toolholder respectively. By making these features integral to the basic components rather than separate locking mechanisms, the design achieves rotational inhibition without adding complexity to assembly or servicing procedures.
Solution Approach 2:
The interlocking protrusion-recess configuration provides automatic rotational locking simply by inserting the toolholder into the mounting block. The geometry itself performs the locking function without requiring additional adjustment or complex assembly steps, maintaining ease of repair while improving component longevity.
3Object-affected harmful factors
If the toolholder is tightly secured to prevent rotation, then frictional wear is reduced, but the toolholder may interfere with servicing operations
Solution Approach 1:
The interlocking features (protrusion and recess) are localized to specific regions of the mounting block and toolholder, providing rotational inhibition only where needed. The rest of the toolholder remains accessible for servicing operations, resolving the contradiction between preventing frictional wear and maintaining servicing accessibility.
Data Source
AI summary
A mounting block assembly and method for assembling is disclosed. The mounting block assembly may comprise a mounting block and a toolholder. The mounting block may include a flighting portion, a mounting portion and a protrusion. The mounting portion defines a first bore that is configured to receive a toolholder. The toolholder includes a generally cylindrical sidewall that defines an axis and defines a second bore that is configured to receive a stem of a cutting bit. The sidewall includes a pair of radially outward extending prongs that define a first recess between the prongs. The first recess is configured to interlockably receive the protrusion when the toolholder is disposed in the mounting portion, wherein the interlocked configuration of the toolholder and the mounting block inhibit rotational movement of the toolholder about the axis.