Elevator Safety Brake Orthogonal Sliding Release
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Solution Overview
Problem
Existing safety brake devices for conveying means, such as elevator cars, require high forces to release the brake shoes from the rail after triggering, which can be cumbersome and inefficient.
Innovation Solution
A safety brake device with a braking element comprising a brake shoe and a base element that slide orthogonally relative to each other, using a sliding element with reduced friction surfaces and limiting elements to facilitate easier release, allowing the brake shoes to be detached from the rail with less force while maintaining effective braking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If brake shoes are pressed against the rail with high force to achieve effective braking, then braking effect is improved, but release force required increases significantly
Solution Approach 1:
The brake assembly is segmented into a brake shoe and a base element that can move independently relative to each other. The brake shoe remains stationary against the rail while the base element slides to accommodate release, separating the braking function from the release mechanism.
Solution Approach 2:
A sliding element with reduced friction surfaces is introduced as an intermediary between the brake shoe and base element. This sliding element acts as a mediator that allows easy relative movement during release while maintaining stable contact during braking operation.
2Reliability
If brake shoes are firmly clamped to the rail to prevent slippage during braking, then braking reliability is improved, but operational complexity increases
Solution Approach 1:
The brake assembly is divided into functionally independent components: a stationary brake shoe that ensures reliable contact with the rail, and a movable base element that handles the complexity of release operations. This segmentation allows each component to be optimized for its specific function.
Solution Approach 2:
The friction characteristics are changed by introducing a sliding element with reduced friction surfaces between the brake shoe and base element. This parameter change allows the system to maintain high friction for reliable braking while enabling low-friction movement for easy release.
3Reliability
If high force is applied to release brake shoes from the rail after activation, then brake reset is achieved, but time consumption increases
Solution Approach 1:
By segmenting the brake assembly into a stationary brake shoe and a movable base element, the release operation can be performed by simply moving the base element along the sliding surface, significantly reducing the time and force required for reset compared to moving the entire brake assembly.
Solution Approach 2:
The sliding element with reduced friction surfaces serves as a mediator that facilitates rapid and easy movement of the base element during release, minimizing the time and effort required to reset the brake system after activation.
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 enables the safety brake device to be released with significantly less force compared to traditional systems, improving operational efficiency and reducing the effort required to reset the brake after activation.
Implementation Method 1
A sliding element with reduced friction surfaces is introduced between the brake shoe and base element
Implementation Method 2
the brake element is pressed against the rail by a force acting orthogonally to the rail... the braking surface rests against the rail
Data Source
Figure 1~2
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Figure 6~8
AI summary
The invention relates to a progressive safety gear and a progressive safety method for conveying means, in particular for lift cars, having a load-bearing element, which can be fastened on the conveying means, and having at least one braking unit, which is intended to act on a rail arranged at a fixed location parallel to the conveying route. The invention also relates to such a braking unit comprising at least one braking jaw and at least one base element, wherein each braking jaw comprises at least one braking surface and is arranged such that, in the event of braking, it can butt against a rail by way of the braking surface, and wherein each braking jaw also has a surface ("sliding-10 surface-B") which is located opposite the braking surface and is oriented in particular parallel to the braking surface, and wherein each base element is designed to be connected to the progressive safety gear and the base element has a surface ("sliding surface-S") which is oriented in the direction of the braking surface of the braking jaw, and wherein sliding surface-B and sliding surface-S are oriented towards one another and make it possible for the at least one braking jaw and the at least one base element to slide along one another on a plane parallel to the at least one braking surface of the respective braking jaw.