Elevator Safety Brake Parallelogram Guide Reset
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Solution Overview
Problem
Existing safety brakes for elevators lack a mechanism to ensure safe and efficient triggering and resetting, particularly in electronically triggered systems, where energy storage means require distinct resetting processes.
Innovation Solution
A safety brake system comprising a first braking element, a guide element, and an actuating element, where the guide element is movable between rest, braking initial, and braking positions, utilizing a parallelogram guide and linear bearing to ensure full surface contact with the rail for effective braking, and an actuating element that resets the system without additional energy supply.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the guide element is moved into the braking initial position to activate the safety brake, then the braking element can be pressed against the rail for effective braking, but the system requires additional energy supply for actuation
Solution Approach 1:
The braking element is designed to automatically return to its initial position after braking through the elastic recovery of the spring element. The spring stores energy during braking and automatically releases it to reset the mechanism, making the system self-servicing without requiring external energy input for resetting.
Solution Approach 2:
The safety brake operates in periodic cycles of activation and automatic reset. The actuating element moves the guide element to the braking position when needed, and the spring element automatically returns the system to its initial state, creating a periodic action pattern that reduces overall energy consumption.
2Speed
If the braking element touches the rail only at certain points during rotation, then the mechanism can rotate smoothly, but the braking effectiveness is reduced
Solution Approach 1:
The guide element is designed to be movable between different positions (rest position and braking initial position) rather than fixed. This dynamic positioning allows the braking element to achieve full surface contact with the rail when needed, transforming the system from a purely rotating mechanism to one that combines linear movement with rotation for optimal braking contact.
Solution Approach 2:
The guide element acts as an intermediary between the actuating element and the braking element. It translates the actuating movement into precise positioning of the braking element against the rail, ensuring full surface contact while maintaining the rotational capability of the braking mechanism.
3Reliability
If an additional activation element is provided to guarantee safe engagement, then the safety is improved, but the device complexity increases
Solution Approach 1:
The actuating element and guide element are functionally integrated in the parallelogram mechanism. The actuating element directly controls the guide element's movement between positions, combining the functions of activation and positioning into a unified mechanism that reduces overall system complexity while maintaining safety.
Solution Approach 2:
The parallelogram guide mechanism ensures that the guide element moves in a controlled manner between the rest position and braking initial position, maintaining proper alignment and engagement throughout the movement. This equipotential movement pattern guarantees safe engagement without requiring additional complex activation mechanisms.
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 system provides a safer and more efficient braking mechanism by ensuring full surface contact with the rail, absorbing large forces through the housing, and allowing easy release and resetting without additional energy, reducing wear and maintaining constant friction forces.
Implementation Method 1
Typically, the safety brake has a spring element which, when the safety brake is activated, presses the braking element into engagement with the rail
Implementation Method 2
a friction surface provided for this purpose is aligned substantially in parallel with the rail surface. Due to the contact and a relative movement between the rail and the braking element, a friction force develops between the braking element and the rail, the braking force moving the braking element further into the braking position.
Data Source
AI summary
A safety brake includes a first brake element, a first guide element, and an actuating element. The first brake element is mounted in a displaceable manner in a linear bearing on the first guide element. The first guide element can be moved between a rest position and a braking initial position. The actuating element is designed to move the first guide element from the rest position into the braking initial position, more particularly to activate the safety brake. The first brake element can carry out a braking movement from the braking initial position into a braking position. The braking movement returns the first guide element to the rest position. The first guide element is guided on a first parallelogram guide.