Bistable Ratchet Mechanism for Power-Failure Position Holding
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Solution Overview
Problem
Existing braking, clamping, and gripping devices require continuous energy supply to maintain end positions, and there is a need for a mechanism that can securely hold positions without continuous power, especially in case of power failures.
Innovation Solution
A bistable form straightening ratchet mechanism is implemented, using a carriage and coupling element supported by springs, which mechanically locks the movement of the working device in its end positions, allowing for stable holding without continuous energy input.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If continuous energy supply is used to maintain end positions, then the device can reliably hold positions, but energy consumption increases and the system requires continuous power
Solution Approach 1:
The locking mechanism uses spring elements that automatically engage with the output element at end positions without requiring continuous external energy supply. The spring-loaded detent mechanism self-locks the position mechanically, making the system self-sufficient for position maintenance.
Solution Approach 2:
The patent replaces continuous energy-based holding systems (electrical motors, electromagnetic actuators, or pneumatic/hydraulic pressure maintenance) with a mechanical locking system using spring elements and detent mechanisms that hold positions through pure mechanical means.
2Reliability
If continuous energy supply is used to maintain end positions, then the device can maintain control, but the system becomes vulnerable to power failures
Solution Approach 1:
The spring-loaded locking mechanism operates independently of external power sources, automatically engaging and disengaging based on the output element's position. This eliminates dependence on continuous power supply and ensures operation during power failures.
Solution Approach 2:
The locking mechanism is designed to automatically engage before power failure can cause uncontrolled movement. The spring elements are pre-loaded to ensure immediate locking capability, providing a safety buffer against power loss scenarios.
3Use of energy by moving object
If a locking mechanism is added to enable self-locking, then energy efficiency improves, but device complexity increases
Solution Approach 1:
The locking mechanism is integrated into the existing drive system structure. The coupling element connects the locking mechanism with the drive device, merging the locking function with the existing mechanical components rather than adding a completely separate system.
Solution Approach 2:
The slide component serves multiple functions: it acts as both a coupling element for the locking mechanism and a guide for the output element's movement. The spring elements provide both the locking force and the restoring force for movement between end positions.
4Stability of the object's composition
If a slide and coupling element are added for the locking mechanism, then position stability improves, but the number of components increases
Solution Approach 1:
The slide is designed to perform multiple functions simultaneously: it serves as the coupling element between the locking mechanism and drive device, provides guidance for the output element, and houses the spring elements. This consolidation reduces the number of separate components needed.
Solution Approach 2:
The coupling element is designed with a guide track that simultaneously provides mechanical coupling, positional guidance, and locking engagement features. This multi-functional design reduces component count while maintaining position stability.
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 mechanism enables secure holding of end positions in both powered and unpowered states, ensuring reliable operation and energy efficiency by utilizing a spring-loaded system for self-locking, reducing the need for continuous energy supply.
Implementation Method 1
The slide is supported on the housing in the direction of action of the output element by means of a spring element or a spring system
Implementation Method 2
The output element is spring-loaded against the slide in its direction of action
Data Source
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AI summary
The invention relates to a device in which a movably mounted output element has two end positions, wherein a latching mechanism is arranged between the output element and the driving device thereof, via which latching mechanism the output element can be brought by a lifting or pivoting movement during a first driving pulse out of the first into the second end position counter to a restoring force and via which, during a second driving pulse, the output element can be transferred from the second into the first end position by the restoring force. A device is developed by the present invention, the device, for example within a braking, clamping or gripping device, permitting two stable end positions in which the particular useful device is kept in the actuated or unactuated state without the supply of external power.