Door or protective hood locking control system as a safety device for machines
AssigneeElge Elektronik-Geratewerk GmbH & Co.
InventorGerhard Nesper
Life of this patent
Estimating the term…
Abstract
For a door or protective hood locking control system of a safety device with normal or excessive safety for machines, particularly machines carrying out rotational motions, a stoppage monitoring guard is disposed in the current circuit for the door locking mechanism that is operated by push-buttons. This stoppage monitoring guard is taken from a redundant, rotational motion signal evaluating system of the target installation of a rotational motion monitoring device, which is already present, and operates redundantly to monitor each axle with two rotational motion sensors so that a dedicated rotational motion sensing system can be dispensed with for the redundant operation of the door locking system.
Claims13
A door locking control apparatus for the safe operation of a machine having at least one rotational element, a door frame, and a door movable between a closed and an open position to provide access to said at least one rotational element, comprising:
- stop means for sensing stoppage in rotational motion of the rotational element, said stop means including at least two independent rotational motion sensors for generating respective stop signals when said rotational element has stopped;
- shut down means for selectively allowing and blocking driving energy to rotate the rotational element and responsive to said stop signals for blocking driving energy;
- and
- lock means connected with the door and door frame for locking and unlocking the door and responsive to said stop means signals for unlocking the door so that both said shut down means and said lock means are responsive to the same stop signals;
- said lock means including a door contact circuit and a second contact circuit operable manually by an operator, the second contact circuit including a locking mechanism corresponding to the lock means.
Dependencies are inferred from the claim text.