Conveyors: power-driven – Conveyor or accessory therefor specialized to convey people – With means to control the operation of the section
Patent
1994-08-19
1995-08-22
Dayoan, D. Glenn
Conveyors: power-driven
Conveyor or accessory therefor specialized to convey people
With means to control the operation of the section
198338, B66B 2904
Patent
active
054431450
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a safety device at the run-in point of a circulating handrail of an escalator, a moving walkway, or a like moving passage, into a stationary wall.
In the region of the run-in point of the circulating handrail, escalators and moving walkways have a safety device that has shown that persons riding on an escalator, particularly children, hold the handrail until their hand reaches the run-in point of the handrail into the stationary wall. In such a case it can occur that the fingers are pulled into the gap located between the surface of the handrail and the run-in opening in the wall. Without certain safety measures, therefore, the danger exists of serious injuries.
To avoid such injuries, in DE-PS 2,054,640 a safety device is proposed which uses a plurality of plates pivotably disposed at the run-in points and structured in the manner of flaps. If the handrail is also still held by a person in the region of the run-in point, the touching of the plates by the fingers leads to their pivoting, by means of which the contact of a safety switch for shutting down the escalator is activated. To prevent mischievous spurious release of the safety device by means of an undesired activation of the plates, it is further provided in the known safety device to use respectively two pivotable plates disposed one behind the other with small spacing. In this instance the spacing between the handrail and the inside edge of the first plate is dimensioned to be so large that the fingers can extend into this gap without injury. Not until one of the two rear plates is touched is the common safety switch activated, and at the same time, the still-closed first plate is unlocked. This known safety device meets high requirements with respect to safety and protection against spurious releases; however, it is expensively composed of a number of parts. To transmit the pivoting movement of the plates onto the contact of the safety switch, activation means provided with a run-on edge are required whose adjustment must be undertaken exactly with respect to all of the plates, on the one hand, and with respect to the contact of the safety switch, on the other hand, in order to assure the desired function. Even slight deviations from the provided settings can lead to the front plate being unlocked too late, because of which injuries can occur.
SUMMARY OF THE INVENTION
The goal of the subject of the invention is the creation of a safety device for emergency stop of the drive when objects (fingers or the like) enter into the handrail run-in, in which case shutdown is intended to take place, even with a ruptured or slack handrail. The safety device should be simply designed and easily accessible.
This goal is achieved by means of an elastically deformable handrail run-in part in whose rear region a rod-shaped element which transmits the deformation of the handrail run-in part onto a limit switch is seated by means of connecting elements.
Advantageous modifications of the subject of the invention are to be taken from the dependent claims.
As a consequence of the elasticity of the handrail run-in in connection with the one rod which converts the buckling of the elastic part into a longitudinal movement, the downstream limit switch can already be activated in time, so that a danger for people can be excluded to the fullest extent. The same applies for objects that intentionally or unintentionally enter the handrail run-in and can possibly lead to damage of escalator components. To provide a delayed reaction time of the safety device with simple means, the course of movement of the rods is influenced by a mechanically prestressable prestressing device. This means that the limit switch is first activated with the occurrence of a force having a predetermined effect on the elastic region of the handrail run-in. With this measure it can be ensured that the escalator or the moving walkway is not subjected to emergency shutdown with each possible, unintended touching of the elastic handrail run-in.
The
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Dayoan D. Glenn
O&K Orenstein & Koppel AG
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