Portable Milling Spanner Mechanism for One-Handed Tool Clamping
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Solution Overview
Problem
Existing portable milling machines require complex operations and may incur damage from undesired lateral forces during tool clamping and unclamping, as they rely on locking pins that apply punctiform force.
Innovation Solution
A portable milling machine design where the spanner is connected to the housing for conjoint rotation, allowing the clamping nut to be easily engaged and disengaged by rotating the spindle, eliminating the need for locking pins and distributing force optimally through a spindle key and sleeves.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a locking pin is used to block the spindle during clamping and unclamping, then the clamping nut can be twisted off the tool holder, but undesired lateral forces may damage the spindle
Solution Approach 1:
The invention removes the locking pin mechanism entirely from the system. Instead of using a separate locking component to block the spindle, the patent integrates the blocking function directly into the spanner mechanism itself, which rotates together with the housing and automatically blocks the spindle during clamping operations without requiring additional blocking components
Solution Approach 2:
The invention combines multiple functions into the spanner mechanism: it serves as both the clamping tool (rotating the clamping nut) and the spindle blocking mechanism (rotating with the housing to prevent spindle rotation). This merging eliminates the need for separate locking pins and reduces the number of components while maintaining the blocking function
2Adaptability or versatility
If the spanner is rotatable relative to the housing, then the clamping nut can be disconnected, but the operation becomes more complex requiring separate blocking mechanisms
Solution Approach 1:
The spanner is designed to rotate together with the housing as a unified mechanism, merging the housing rotation function with the spanner positioning function. This eliminates the need for separate blocking mechanisms and simplifies the overall device structure while maintaining the ability to engage and disengage the clamping nut
3Ease of operation
If the spanner interlockingly surrounds the clamping nut, then the clamping nut can be rotated for clamping and unclamping, but the spanner must be precisely positioned
Solution Approach 1:
The spanner is designed with dynamic positioning capability, allowing it to be moved axially between engaged and disengaged positions relative to the spindle. This dynamic adjustment enables the spanner to automatically align with the clamping nut when needed while maintaining rotational freedom when disengaged, simplifying the positioning mechanism
Data Source
AI summary
Portable milling machine having a housing, a spindle and a clamping nut, which, as part of a tool holder, can be rotatably connected to the spindle and detached therefrom in order to clamp and unclamp a milling tool, and the portable milling machine having a spanner, which can be moved relative to the spindle axially between an engaged position and a disengaged position, the spanner interlockingly surrounding the clamping nut at least in portions in the circumferential direction in the engaged position and, when the spanner is in the disengaged position, the clamping nut being rotatable relative to the spanner, the spanner being connected to the housing of the portable milling machine for conjoint rotation such that, when the spanner is in the engaged position, the clamping nut can be connected to the spindle and detached therefrom by manually rotating the spindle.