Elevator Safety Gear Synchronizing Device
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Solution Overview
Problem
Existing elevator safety gear systems face challenges in synchronizing the triggering of safety gears, leading to uneven force application and potential asynchronous activation during braking.
Innovation Solution
The elevator system incorporates a synchronizing device with pivot levers that undergo a translatory movement in addition to rotational movement, allowing for central positioning above the clamping body's center of gravity, and an indirect connection between pivot levers for uniform force application.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pivot levers are connected directly to safety gears with fixed pivot axes, then the structure is simple, but synchronous triggering of safety gears cannot be achieved due to sag and angular offset
Solution Approach 1:
The patent applies the dynamics principle by making the pivot axes of the pivot levers movable rather than fixed. The pivot axes are guided to move along predetermined paths during the triggering process, allowing the pivot levers to maintain proper alignment and eliminate sag and angular offset. This dynamic adjustment ensures synchronous triggering of safety gears while managing the complexity through controlled movement rather than rigid fixed connections.
Solution Approach 2:
The patent uses guiding elements as intermediary components between the pivot levers and the fixed structure. These guiding elements constrain the pivot axes to move along specific paths, mediating between the need for synchronous triggering and the structural requirements. The guiding mechanism acts as a mediator that translates the triggering force into coordinated movement of multiple pivot levers, ensuring they remain synchronized without requiring direct complex interconnections.
2Ease of operation
If deflection pulleys and belts are positioned close to guide rails for smooth running, then ease of operation is improved, but space for synchronizing element is reduced
Solution Approach 1:
The patent resolves the space conflict by changing the dimensional arrangement of the synchronizing element. Instead of placing it in the limited horizontal space near the guide rails, the synchronizing element is positioned in a different spatial dimension or orientation, utilizing available space more efficiently. This allows the deflection pulleys to remain close to the guide rails for smooth operation while providing adequate space for the synchronizing mechanism to function properly.
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
This configuration enhances the stability and precision of the synchronizing device, ensuring synchronous and complete triggering of safety gears, reducing sag and angular offset, and minimizing wear.
Implementation Method 1
a translatory movement relative to its pivot axis is superimposed on the pivot levers (18) or their rotating movement
Implementation Method 2
the pivot lever (18) can be pivoted about at least one stationary pivot axis (21) on the car
Implementation Method 3
The brake actuation force is transmitted to the safety gears (3) via a synchronizing device (9) for synchronous triggering
Implementation Method 4
the detection of an impermissibly high speed and the subsequent necessary triggering of the safety gear is typically carried out with the aid of a so-called overspeed governor
Implementation Method 5
The deflection pulley of the overspeed governor 7 is connected to a centrifugal brake, which is set to brake the deflection pulley of the overspeed governor 7 above a predefined, impermissibly high speed
Data Source
Figure 1
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AI summary
Elevator (1) with a car (2) and at least two safety gears (3) mounted at a distance from one another on the car (2), as well as an overspeed governor with an activating element controlled by the overspeed governor which, in the event of overspeed, applies a brake actuating force preferably in the form of a tractive force, which is transmitted to the safety gears (3) via a synchronizing device (9) for synchronous triggering, the synchronizing device (9) having a pivot lever (18) for each safety gear (3) which is hinged on its one end side in an hinge area (20) on the clamping body (4) of the safety gear (3), and is connected on the other side via a synchronizing element (10) to another pivot lever (18) which is assigned to another safety gear (3), wherein a translatory movement is superimposed on the pivot levers (18) relative to their pivot axis (21), causing said hinge area (20) of the respective pivot lever (18) to perform a resultant movement which is translatory.