Toolholder Secondary Retention System for Controlled Removal
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Solution Overview
Problem
Existing toolholder support systems lack a secondary retention mechanism to control the toolholder once it is released from the primary retention system, leading to uncontrolled falling, especially with heavy toolholders, which requires operators to use both hands for deactivation and support.
Innovation Solution
A secondary retention system within the toolholder support member featuring a retention bore with a biasing element that urges a retention member to protrude through the bore wall, engaging the toolholder's perforation surface to prevent uncontrolled release, allowing controlled removal by requiring a specific extraction force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a primary retention system with locking balls is used to secure the toolholder, then the toolholder is securely held during operation, but once released the toolholder may freely fall and requires operator support
Solution Approach 1:
The retention system is divided into two independent subsystems: a primary retention system (locking balls in perforations) for secure operation, and a secondary retention system (retention member in retention bore) for controlled removal. This segmentation allows each subsystem to perform its specific function without interfering with the other, resolving the contradiction between secure retention and controlled removal.
Solution Approach 2:
The secondary retention member is pre-positioned to engage the toolholder shank before the primary retention system is activated. This preliminary action ensures that when the primary retention releases the toolholder, the secondary retention is already in place to guide controlled removal, preventing uncontrolled falling.
2Strength
If the toolholder is made heavy for durability, then it is more robust, but it requires two hands to support during removal
Solution Approach 1:
The secondary retention member acts as an intermediary between the heavy toolholder and the operator. It provides a controlled interface for removal, allowing the operator to manipulate the retention member rather than directly supporting the heavy toolholder, thus making handling easier while maintaining toolholder robustness.
3Reliability
If the retention member protrudes deeply through the bore wall, then retention is stronger, but extraction force required becomes excessive
Solution Approach 1:
The retention member protrudes partially through the bore wall - enough to provide reliable retention of the toolholder, but not so much that excessive force is required for extraction. This partial action optimizes the balance between retention strength and ease of removal, avoiding the extremes of insufficient retention or excessive extraction force.
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 controlled removal of the toolholder by ensuring it remains restrained until the operator applies sufficient force to overcome the biasing force, reducing the risk of uncontrolled falls and allowing for easier handling of heavy toolholders.
Implementation Method 1
a biasing element within the biasing bore urging the retention member toward the opening of the receiving bore wall
Data Source
AI summary
A toolholder support member for retaining the shank of a toolholder has a bore to accept the toolholder shank. A retention member extends through the bore wall to engage a perforation extending through the shank or indentation within the shank, thereby retaining the shank within the receiving bore. The retention member is biased to provide resistance for insertion or extraction of the shank within the receiving bore. Furthermore, the retention bore is angled relative to the longitudinal axis of the receiving bore so that the force required to insert the toolholder within the receiving bore is minimized, while the force required to extract the toolholder from the receiving bore is maximized.