The basic design of this type of door includes from two to four vertical leaves attached overhead with a central shaft. The door leaves then pivot around a vertical axis within a partial cylindrical drum. The wings of the doors usually rotate in a counterclockwise direction. Revolving doors can operate manually or automatically. Manual styles require users to push the leaves as they move through the door to enter or exit.
Automatic doors are set in motion when someone approaches the door from inside or outside the building. Electronic sensors and motorized gear assemblies rotate the leaves without manual pushing and control the speed of rotation. Diagram showing the essential parts of a typical commercial revolving door. Applications for revolving doors often include healthcare facilities, universities , hotels, public buildings, retail spaces, financial institutions, residential complexes, and offices.
These types of doors are typically installed at the main entrance to facilitate traffic and provide easy access in and out of the building. For many structures, they are the most energy-efficient entrance solutions available. This type of door helps keep heated and air-conditioned air within the interior of the building, while preventing drafts from outside. These commercial standards are meant to help protect users from getting injured or trapped.
For example, ANSI mandates features such as motion detectors, entry point sensors, toe guard sensors, and contact safety edges. Revolving doors used as a means of egress in the event of an emergency are subject to International Building Code ANSI requires a swing or slide door to be installed on the same level, next to the revolving door.
The IBC and the NFPA state that at least one door must be available within 10 feet of a revolving door in case it malfunctions or gets stuck. Rotating doors cannot be relied upon as fire doors. Ceci uses a cable-operated system to vertically extend bars between the doors to prevent rotation thereof. The other patents describe other types of locks for a revolving door. Calandritti et al. Among the objects of the invention are to provide an improved lock for a revolving door of the selectively-activated, electrically-controlled type; to provide an improved lock of this type which can be installed on existing revolving doors with minimum modification or alteration to the door structure and which does not affect the door's operation when the lock is inoperative; to provide an improved lock of the foregoing type having a lock-release key operated by rotation of the door; to provide an improved lock of the foregoing type having a locking element which engages both sides of a door panel for increased, effective stopping of the door; and to provide an improved lock of the foregoing type having a spring-biased locking element restrained by a key released by rotation of the door.
These and other objects of the invention are attained in a lock particularly adapted, upon operation, to rotationally immobilize a revolving door, which includes a lock assembly activating rod controllably extensible into the path of the door by an electromagnetic coil. Movement of the rod by rotation of the door rotates a key into a release position permitting a spring-biased locking member to be forced onto the edge of the door, straddling both sides of the door to prevent its rotation.
The lock is reset by retracting the key rod and locking member into the assembly housing and rotating the key into position to restrain the locking member against the bias of its spring. Referring more particularly now to the drawings, FIGS. The revolving door assembly 10 includes a revolving door 12 having a plurality of individual doors or leaves 14, each supported along a vertical edge by a central, rotatable support 16, and selectively rotatable in one direction, such as the counterclockwise direction indicated by the arrow A.
The central support 16 is suitably anchored at its extremities, and bearings not shown are provided for ease of rotation of the door panels While the drawings illustrate the door 12 to have four, diametrically-disposed leaves or panels 14, any number of such leaves may be provided. The individual panels or leaves 14 of the revolving door 12 is preferably made of a transparent material, which may be impact- or shatter-resistant. The revolving door 12 rotates within a cylindrical envelop partly defined by two, fixed, vertically-extending, diametrically-opposed cylindrical sectors 18 which, preferably, are made of a transparent material such as glass or plastic.
If the revolving door assembly 10 provides entry and exit from a secured premise, the cylindrical sectors 18 may be made of an impact- or shatter-resistant material. The cylindrical envelop in which the revolving door 12 rotates is topped by a canopy or roof 20, which is partially shown in FIG.
A wall structure 22 extends from the sectors 18 to complete the revolving door installation 10, with the portions 22a of the wall closest to the cylindrical sectors being of a transparent material, if so desired. The security lock of the present invention, identified generally at 24, is mounted on the canopy 20 of the revolving door 12, adjacent to the outer radial edge thereof, so as to engage the outer radial edge of the door panel 14 disposed there beneath.
Referring now to FIGS. Disposed within the lock housing 26 is a locking element 30 which, in cross-section, resembles an inverted U. The downwardly-extending sides 32 of the locking element 30 pass through elongated slots or openings 34 extending through the base 28 and the roof or canopy 20 of the revolving door.
The locking element 30 includes a cross member or cross piece 36 interconnecting the sides 32, and is preferably integrally formed therewith. Attached to the cross piece 36, and extending through openings 38 provided in the upper surface of the lock housing 26, is an inverted U-shaped handle Fixed to the base 28 of the lock housing 26 is a lock holder 42 in the shape of a vertically-extending cylindrical rod having a smooth, contoured upper end surface 42a.
A circular bore 44 extends through the thickness of the cross piece 36 and is sized to permit the free passage of the lock holder 42 therethrough. The ends of a coil spring 46 are biased against the upper surface of the cross piece 36 and the inner surface of the upper wall of the lock housing 26, as shown in FIG.
A guide means 48, fixed to and movable with the locking element 30, extends coaxially above the bore 44, to permit unobstructed passage of the lock holder 42 upwardly through the interior of the coil spring 46 during operation of the security lock, as explained more fully below. The guide means 48 may be a hollow cylindrical tube having a height equal to the compressed length of spring As shown more particularly in FIGS.
Disposed adjacent to the locking element 30 is an electromagnetic coil 52 having a central, cylindrical bore 52a extending therethrough. Wires 54 connect the coil 52 to an electric source and a control switch, both of which are not shown.
A plunger 56 has a cylindrical shaft 58 which is slidably and rotatably received within the bore 52a of the electromagnetic coil The plunger 56 is provided with a laterally-extending tab portion 60 at the upper end of the shaft 58, and as shown in FIG.
A spring 64 is positioned around the shaft 58, and has its ends biased against the under surface of the tab portion 60 and the upper portion of the electromagnetic coil 52, to bias the plunger 56 upwardly, into the position shown in FIG. A key 66 is rotatably supported on the cross piece 36 of the locking element 30 by a pin 68 affixed thereto, such that the key is vertically movable with the locking element and is rotatable about the axis of the pin.
One end portion 66a of key 66, the left hand portion as viewed in FIGS. The other end of the key 66 is provided with a cylindrical boss 70 having a central bore extending vertically therethrough, the bore not being visible in the drawings.
Slidably received within the bore in the boss 70 is an elongated key rod 72 having its upper end 72a supported by the tab portion 60 and adapted for reciprocation within the elongated slot 62, the lower end portion 72b of the key rod being adapted to pass through aligned, elongated holes in the base 28 of the lock housing 26 and the canopy 20 of the revolving door As shown more fully in FIGS.
The upper end portion 72a of the key rod 72 may be provided with means, such as an enlarged head portion, which the key rod and the elongated slot 62 in the tab portion 60 of plunger When the lock 24 is in the set or non-operative condition, the locking element 30 is completely retracted within the lock housing 26, compressing the spring 46 between the interior of the top wall of the housing and the top surface of the cross piece 36, as shown more particularly in FIGS.
The locking element 30 is maintained in this condition by the interior portion 66a of the key 66 resting on the upper, contoured surface 42a of the key holder As shown in FIG. They meet the most exacting security requirements and offer optimum protection for the sensitive areas of a building.
The required safety levels are provided individually by the activation and authorisation from the straightforward authorisation of staff access by a card reader or code entry keyboard, to verification of identity by using biometric systems in the interior of the lock.
Anti-backtrack lanes guide the flow of arriving passengers at the air terminal, acting as a form of automatic access control that prevents returning to airside areas. SRD Vision is a security option for security revolving doors. It features an optical sensor integrated in the ceiling and a sensor control box. Automated access solutions for convenient, automated building access.
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