Movable or removable closures – Panel with closure feature – Modified to accommodate lock or latch
Reexamination Certificate
2001-03-26
2003-02-11
Redman, Jerry (Department: 3634)
Movable or removable closures
Panel with closure feature
Modified to accommodate lock or latch
C049S013000, C070S422000, C070SDIG004, C292SDIG006
Reexamination Certificate
active
06516569
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention generally relates to door terminals for use with doors, such as sliding doors, folding doors, pivot-hung doors, and automatic doors. As is generally well-known in the art of doors and door terminals, it is often desirable to equip the door with some type of lock or locking mechanism to prevent unauthorized opening of the door in order to restrict access to a room or other building structure. The most commonly used system is a simple lock and key system where only users having a key matching the particular lock may have access to the room. However, it is often desirable to modify, replace, or add to such a simple system if a greater degree of security is required, such as in an office or government facility. For examples, a lock and key system could be used in conjuction with a security card.
Although a lock and key system is often an effective means to restrict access, it is not invulnerable to tampering by an unauthorized person desiring access to the restricted space. To further increase security, the lock system often can be equipped with further protection to help prevent tampering. By substantially enclosing the lock system in a housing or casing, for example, it is possible to substantially secure the lock system so that unauthorized persons cannot physically access the lock system without causing great damage or exerting considerable energy to gain access. By increasing the number of obstacles one must overcome to gain access to the locking mechanism, the chances of unauthorized access are correspondingly reduced.
In addition to increasing the overall security to a lock system at a door, safety of building occupants must also be maintained without sacrificing heightened security. Therefore, it can become necessary to equip the door terminal with a safety mechanism that can permit a user to bypass the locking system simply and quickly in case of an emergency. In an emergency situation, such as a fire in the building, occupants must be able to exit quickly, so a lock system that requires special access measures may endanger occupants by not allowing them to exit through the door if they do not have the required key or code. The door lock system should therefore be equipped with an emergency button or similar device that would bypass the security lock and permit opening of the door.
This invention is further based on a door terminal, which door terminal presents a housing in which are arranged a profile cylinder with an associated electronic circuit board, an audible alarm transmitter and/or visual display means, an emergency pushbutton in connection with a switch block to release a locking device, a protection pane covering the emergency pushbutton and a stationary attached mounting plate at which the housing is detachably mounted and securable by means of a anti-sabotage contact.
This invention is also based on a door terminal with an emergency pushbutton. The door terminal has.a profile cylinder with an associatedelectronic circuit arrangement, an audible alarm transmitter and/or visual display means and an emergency pushbutton in connection with a switch block to release a locking device are located within a housing of the door terminal, whereby a protection pane arranged in a covering frame covers the emergency pushbutton.
2. Background of the Invention
Such door terminals are employed as compact equipment in emergency exits in access controlled environments. Such a door terminal has been launched under the designation “DORMA TLG”. Such a door terminal type is known from German patent 196 52 348 A1. A stationary mounted housing in the area of the door comprises a profile cylinder, which serves to acknowledge an alarm and to deactivate/activate the door security system. Furthermore, light emitting diodes are integrated into the housing to display the operating condition “locked/unlocked”. Moreover the housing comprises an audible alarm transmitter and an emergency pushbutton together with a forced-opening switch block. The housing, attached at a mounting base solidly fastened to the wall, is secured by means of an anti-sabotage contact. The emergency pushbutton is protected against accidental operation by a shatterproof protection hood made from plastic material. In the event of danger after a powerful stroke, the spacers of the a protection hood will brake after a powerful stroke, whereby simultaneously the emergency pushbutton will be pushed down. The door can then be opened almost without any resistance, whereby an audible alarm signal will be released.
The door terminal slides onto the mounting base fixed to the wall and is fastened on the underside to the mounting base. Due to this fastening arrangement, a concealed in-wall mounting, especially with already existing system housings, is very difficult or not possible at all, as the required mounting space is not available. Basically, the accessibility from the underside of the housing is not particularly advantageous with regard to the installer's position during installation. Another problem is that the electric subassemblies mounted in the terminal housing are wired with supply lines already existing on the construction site. For this reason, while executing installation work, the detached door terminal must be fixed or held with one hand, such that further operations can only be executed with the other hand. The existing anti-sabotage contact is arranged on a separate holding bracket and activated by means of the housing's underside attachment. In this case, it is disadvantageous that the attachment of the housing can be dismounted with commercially available tools. The surrounding border of the mounting base requires an adaptation to the housing shape of the terminal, such that for different housing variants a corresponding amount of different mounting bases must be produced.
A door terminal is also known from Federal Republic of Germany patent No. 196 52 348 C2. An emergency pushbutton, as well as visual and audible display means, an electronic circuit arrangement, and an access control insert are located within its housing. The access control insert has been exchangeably executed in a modular manner with the intention to realize different access controlled systems while maintaining the other components. The emergency pushbutton is also covered by means of a shatterproof protection hood.
Moreover Federal Republic of Germany patent U.S. Pat. No. 94 08 898 U1 published a danger warning system presenting audible as well as visual display means. An internally located emergency pushbutton is protected against accidental operation by means of a glass pane, which must be manually destroyed to trigger an alarm signal.
In Federal Republic of Germany patent No. 38 41 099 C2 a door guard is described, where the housing covering the pushbutton has to be pivoted sideways in order to reach the emergency pushbutton. A covering pane prevents an abusive operation of the housing, which pane however has to be destroyed in the event of danger.
The operation of the emergency push-buttons requests, for all terminals known from the aforementioned state of the art, the exchange of the then destroyed cover, which requires, as a result, a corresponding reserve supply expense for new covers and maintenance work resulting therefrom. On the operator side, the maintenance expenditure caused by abusive operation especially is not desired. When utilizing glass covers instead of plastic covers, the hindrance level against abuse is certainly increased, but the basic problem however, i.e. exchanging the destroyed covers, remains unchanged. Nevertheless, practical experience and diverse guidelines recommend a cover for the emergency pushbutton to protect the alarm systems from accidental operation as much as possible.
OBJECT OF THE INVENTION
One possible object of the invention is to develop a door terminal for use with doors, such as sliding doors, folding doors, pivot-hung doors, and automatic doors. Since it is often desirable to equip a door with some type
Dorma GmbH + Co. KG
Nils H. Ljungman & Associates
Redman Jerry
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