Run-off Securing Device Spindle Braking Mechanism
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Solution Overview
Problem
Existing run-off securing devices for hand power tools fail to effectively prevent clamping elements and tools from detaching from the spindle, especially during braking modes when electric power is interrupted, leading to coasting down and potential detachment.
Innovation Solution
A run-off securing device with a transmission unit that includes a motion changing unit to transform relative motion between its components, allowing for a braking mode that prevents detachment by generating a clamping force through a second relative motion, and is designed to be removable and compact, utilizing a stroke unit with ramp elements to maintain tool attachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the transmission unit is made removable to increase flexibility and adaptability, then the ease of operation and range of application are improved, but the reliability of preventing tool detachment during braking modes deteriorates
Solution Approach 1:
The transmission unit incorporates a motion changing unit that dynamically adapts its function based on operational mode. During normal operation, it transmits rotational motion, but during braking modes, it automatically engages a braking function to prevent tool detachment. This dynamic behavior resolves the contradiction by maintaining reliability during critical phases while preserving the removable design for flexibility.
2Reliability
If the transmission unit includes a motion changing unit to transform relative motion into braking action, then the reliability of preventing clamping element detachment is improved, but the device complexity increases
Solution Approach 1:
The motion changing unit merges the transmission function and braking function into a single integrated mechanism. The same relative motion between transmission elements that normally transmits power is converted into braking action during braking modes. This merging approach reduces overall device complexity compared to having separate transmission and braking systems, while still achieving reliable prevention of clamping element detachment.
3Ease of operation
If the first transmission element is movably mounted in the second transmission element to enable relative motion, then the ease of operation and adaptability are improved, but the stability of the connection during braking modes deteriorates
Solution Approach 1:
The movable mounting of the first transmission element in the second transmission element allows dynamic adjustment of the connection state. During normal operation, the relative motion capability enables easy operation and adaptability. During braking modes, the same movable connection stabilizes by converting the relative motion into controlled braking action, preventing tool detachment while maintaining operational flexibility.
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
The solution effectively prevents clamping nuts and tools from running off the spindle, ensuring tool attachment during braking modes and providing flexibility and a wide range of applications with a compact design.
Implementation Method 1
The motion changing unit (24a) is a stroke unit (26a), which is provided to move the first transmission element (20a) as a result of the first relative motion, in particular the rotation, relative to the second transmission element (22a), along an axial direction (28a)
Implementation Method 2
The clamping nut (62a) is provided to clamp the tool (14a) axially against the transmission unit (18a)
Data Source
AI summary
A run-off securing device, in particular a run-off securing device of a handheld power tool, is configured to avoid running off of a clamping element and/or a tool from a spindle. The device has at least one transmission unit, which is removably coupled to the spindle and has at least one first transmission element and at least one second transmission element. The at least one second transmission element is movable in relation to the at least one first transmission element. The transmission unit has at least one movement changing unit, which at least partially transforms a first relative movement between the at least one first transmission element and the at least one second transmission element into a second relative movement in a braking mode.