Tool Holder Shank Ring Nut Coupling Without Radial Dowels
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Solution Overview
Problem
Existing solutions for stabilizing tool holder shanks on ring nuts are prone to accidental detachment due to vibrations, leading to safety hazards and machine damage, as dowels can loosen and escape during machining.
Innovation Solution
The device uses elastic pins housed inside the ring nut to securely connect the tool holder shank, employing a bayonet-type coupling and additional blind holes for permanent fixation, eliminating the need for radial dowels and ensuring the shank remains axially stable.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If radial dowels are used to connect the tool holder shank to the ring nut, then the shank can be stabilized for rotation, but the dowels may loosen and escape due to vibrations and centrifugal force, causing safety hazards
Solution Approach 1:
The harmful radial dowels that protrude from the ring nut are completely removed from the system. Instead, the patent uses internal keyways and keys housed within the ring nut structure, eliminating the projection hazard while maintaining the stabilization function.
Solution Approach 2:
The connection elements (keys and keyways) are nested within the ring nut structure rather than protruding outward. The keys are housed inside the ring nut body, creating a compact internal arrangement that prevents detachment hazards while maintaining connection reliability.
2Ease of operation
If radial dowels are inserted into the ring nut, then the shank can rotate freely, but the dowels are subjected to centrifugal force and may unscrew progressively, causing machine damage
Solution Approach 1:
Instead of inserting connection elements radially outward from the ring nut, the patent inverts the arrangement by creating internal keyways within the ring nut that receive keys from the shank. This reverses the force direction, allowing the structure to better withstand centrifugal forces during rotation.
Solution Approach 2:
The connection system combines multiple elements (shank, ring nut, keys, keyways) into a composite structure where the keys fit into keyways, creating a unified assembly that resists centrifugal force and vibration more effectively than simple radial dowels.
3Ease of manufacture
If traditional half-rings with grease are used to block the shank, then the half-rings remain in position, but additional dowels are needed for secure attachment, increasing device complexity
Solution Approach 1:
The patent merges the positioning function (previously done by grease on half-rings) with the securing function (previously done by dowels) into a single integrated key-and-keyway system. This eliminates the need for separate grease application and dowel insertion steps, reducing overall complexity.
Solution Approach 2:
The key-and-keyway system performs multiple functions simultaneously: it positions the half-rings, secures the shank to the ring nut, and allows for free rotation. This multi-functional design replaces the need for separate grease-based positioning and dowel-based securing systems.
Data Source
AI summary
A device for the controlled stabilization of tool holder shanks on the respective ring nut, the tool holder shanks, motorized or non-motorized, being predisposed for ER or other type fixing. The device comprises a ring nut and a tool holder shank of a truncated conical shape provided externally with a groove in which means connecting the ring nut to the tool holder are arranged inside the ring nut. The connecting means consist of an annular body formed of at least two shaped half-rings that define opposite protrusions projecting outwardly and centrally to form a shaped prominence having an arched-convex outer profile; on each of the shaped prominences a recess is made predisposed to house respective elastic pins, by means of which the shaped half-rings are firmly connected inside the ring nut blind holes.