Elevator Braking Roller with Elastic Pressure Body
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Solution Overview
Problem
Existing elevator braking systems are limited to emergency overspeed situations and cannot be easily controlled or released remotely, leading to unnecessary wear and inability to function in regular operations.
Innovation Solution
A bidirectional braking device using a floating caliper principle with a roller and pressure body design that allows for remote release and retraction, ensuring even friction and minimizing wear, enabling the device to function in both emergency and regular operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional safety brake device is used for emergency overspeed situations, then the braking function is reliable, but the device cannot be easily controlled or released remotely and causes unnecessary wear during regular operations
Solution Approach 1:
The pressure body is designed to be movable relative to the guide rail, transitioning between a first position for regular operations and a second position for emergency braking. This dynamic positioning enables remote control capability while maintaining reliable braking function when needed.
Solution Approach 2:
The braking device is designed to serve dual purposes: regular operational control and emergency overspeed braking. The pressure body can be positioned in a first position for regular operations and a second position for emergency braking, making the single device universally applicable for both normal and emergency conditions.
2Productivity
If the braking device is activated frequently for regular operations, then operational control is improved, but wear on the guide rail and braking components increases
Solution Approach 1:
The pressure body contacts the guide rail at different locations depending on its position. In the first position for regular operations, contact occurs at a location that minimizes wear, while in the second position for emergency braking, contact occurs at a different location optimized for braking effectiveness.
Solution Approach 2:
The pressure body dynamically transitions between positions based on operational needs. For regular operations, it remains in the first position with minimal contact to reduce wear. For emergency braking, it moves to the second position where full braking force is applied, thus wear only occurs when necessary.
3Reliability
If the pressure body is designed with elastic spring effect for automatic engagement, then the braking response is automatic and reliable, but the device complexity increases
Solution Approach 1:
The pressure body utilizes the elastic properties of the guide rail itself to achieve automatic engagement. When the roller contacts the guide rail during overspeed, the guide rail's elasticity automatically pushes the pressure body into the braking position without requiring separate spring mechanisms.
Solution Approach 2:
The guide rail serves as an intermediary element that mediates between the roller contact and pressure body engagement. The elastic deformation of the guide rail at the contact point automatically translates into the force needed to move the pressure body into the braking position, eliminating the need for complex spring 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 solution allows for safe and efficient braking in both directions, reduces wear on components, and enables remote control and release, ensuring the braking system can be used in normal operations without compromising its emergency functionality.
Implementation Method 1
a braking or catching device for an elevator car, which is guided in a shaft along vertical guide rails, the braking or catching device using a roller provided with a friction surface as a braking body, which rubs in an inclined is guided to the guide rail running, grooved gap, and is elastically pressed against the guide rail in order to develop a corresponding friction there
Implementation Method 2
the housing of the safety brake device (hereinafter: the pressure body) that is provided for assembly on the elevator car and supports the brake roller is designed here in such a way that it itself exerts a defined spring effect. When the brake is activated, the pressure body presses directly on the guide rail on one side and indirectly on the other side via the brake roller on the guide rail. The further the brake roller is pulled into its assigned groove along the direction of the stop, the more the pressure body is stretched elastically. The current braking forces are correspondingly higher.
Data Source
Figure 1~3
Figure 3b
Figure 4
AI summary
The invention relates to a braking or holding device for a lift cage which is guided in a shaft along vertical guiding rails (2). A roller (9) provided with a friction surface (12) on the envelope surface thereof is movably held, as a braking element, in a pressure body (19) of the braking device, held on the lift cage. The axis of the roller (9) extends normally to the longitudinal direction of the guiding rails (2). The roller is movably guided, by staggered shoulders (11), in a gap (20) of the pressure body, which extends parallel to the associated guiding rail (2), said gap (20) comprising a groove (21) for receiving the friction surface (12) of the roller (9). The distance between the groove (21) and the guiding rail (2) narrows towards one end of the groove, such that the friction surface (12) of the roller (9) lies on the guiding rail (2) in this position and in the groove (21) in position (41). Furthermore, in this position, the shoulders of the roll (9) lie on the gap (20) near the groove (21), in position (41), such that further displacement of the roller (9) is prevented. The gap (20) and the groove (21) extend from a recess (31) defining the inactive idle position, towards both sides, and the roller (9) is connected to an actuator which defines the inactive idle position of the roller and can be remote-controlled by a lift control system, said actuator being embodied in such a way that it subjects the roller to actuating forces oriented substantially perpendicularly to the guiding rail, and thus holds the roller (9) in the recess defining the inactive idle position thereof, as long as the braking or holding device remains passive, and as soon as the braking or holding device is active, the actuator is, in turn, controlled by the lift control system, moving the roller out of the idle position towards the guiding rail and bringing it into contact with same. The groove (21) and the gap (20) are formed, over the regions in which they exert a gripping or friction action on the shoulders (11) or the gripping surface (12) of the roller (9), in the activated state of the braking or holding device, in such a way that the roller (9), following the reversal of the direction of displacement of the lift cage, moves autonomously back into a position wherein it can be brought back into the inactive idle position thereof by the return forces of the actuator controlled by the lift control system, and the actuator is embodied in such a way that it brings the roller from this position into the recess defining the inactive idle position thereof, before the roller is pulled into the opposite groove or gap and thereby brakes in the opposite direction.