HK1073679B - Improved lock for bi-directional doors - Google Patents

Description

Improved lock for two-way door

Technical Field

The present invention relates to locks. In particular, but not exclusively, it is applicable to double-acting revolving or sliding doors, including glass doors.

Background

The glass door is usually provided with pivots or sliders at the upper and lower ends and is mounted by means of connecting fittings. The door closing device may also be combined with upper and lower end pivots or sliders. Known ways of securing such doors are by means of manual or electromechanical locks. Such locks are installed either in the door or in an outer frame, which may be made of glass, wood or an alloy. In particular, electromechanical locks are preferred for upper mounting on the top of a door. However, the concealment of the electrical wiring is a problem due to the transparent glass doors and walls. For bottom mounting, it is common practice to mount a manually or electrically controlled lock on a connection fitting at the lower edge of the door. This typically includes hinge bolts, countersunk bolts, latches, or other vertical locking systems. One disadvantage of floor mounted locks is that dust tends to accumulate in the bolt or bolt slot on the floor, thereby interfering with the closing of the lock. It is also known that doors having locks mounted at both the upper and lower ends must be accurately positioned in a closed position along the centerline of the threshold before the lock is engaged. This is a problem for bi-directional or revolving doors that are not suitable for mounting mechanical door stops. The effect of the hydraulic closure means is also limited here because the door can "float" up to + -20 mm out of the centre position due to manufacturing tolerances, wear and wind loads on the closure mechanism etc.

It is therefore an object of the present invention to provide a lock for positioning and locking a two-way revolving or sliding door that improves upon the aforementioned drawbacks.

Disclosure of Invention

A lock for a bi-directional rotary or sliding door, said lock comprising at least two pins spaced apart by a distance greater than the thickness of said door and adapted for synchronous arcuate rotary movement about an axis between said at least two pins and longitudinal movement from retracted to extended positions, whereby when said lock is initially locked, said pins move from said retracted positions to said extended positions, an edge of said door, when in a position offset from the centre line of said threshold, is engaged by at least one of said pins to lock said door in a position fully on the centre line of said threshold.

Preferably the pins move longitudinally through spaced holes in a circular panel and housing which rotates about the shaft.

More preferably, the pin moves longitudinally along the panel and the housing as they rotate by engaging a ramped cam surface.

More preferably, the lock comprises a cylindrical housing adapted to be inserted into a casting box or casting cavity in a door sill below the centre line in the closed position of the door.

Drawings

The preferred embodiments of the present invention will now be described with reference to the following drawings:

figure 1 is a schematic perspective view in partial cross-section of an electromechanical lock according to the invention,

FIGS. 2 and 3 are perspective views of the lock with the housing omitted, as viewed from the bottom and from the top, and

figures 4-9 are plan and side views of the lock installed in the door sill.

Detailed Description

Referring first to fig. 1, the lock of this embodiment is adapted to be mounted on the floor of a double-swing or sliding glass door along the centre line of the threshold. The lock is preferably mounted at the furthest point from the hinge or pivot in the layout of the swing door. A panel 1 and a trim ring 2 surrounding it are completely flush with the threshold. A cylindrical lock housing 3 extends downwardly to engage a transverse pin 4 and is located in a pouring box 5 in the cavity of the threshold. The two pins 6, 7 are located in holes 8, 9 in the panels and are spaced apart by a distance greater than the thickness of the door, as will be described in more detail below. In this embodiment, the pins are spaced apart by a distance exactly as long as the diameter of the pitch circle.

As will be more apparent, as shown in figures 2 and 3, the pins 6, 7 also extend downwardly through a housing 10 beneath the panel and have ball bearings as the ends 6A, 7A which engage two 1/4 rounded surfaces 11, 12, the 1/4 rounded surfaces being the later mentioned cam bodies 13, 14. These cam bodies are in turn also fixed diagonally within the cylindrical housing 3 on a circuit board or printed circuit board 16. An electric motor 17 is located between the cam bodies and extends centrally upwardly and is likewise secured to the lock housing 3 by means of a flange 18 and a connecting bracket (not shown). The motor shaft is inserted into a splined hole in the housing 10, whereby the whole of the housing, the panel and the pin can be rotated by a rising and falling arc. Preferably, but not necessarily, the angle between the deadbolt housing 3 and the cam bodies 13, 14 is 90 degrees. The pin is raised or lowered by the guidance of the cam ramps 11, 12, depending on the direction of rotation of the pin. Although fig. 1 to 3 all represent the situation in which the pin is raised or fully latched at the top of the cam body, rotating the cover and the panel in the clockwise direction a, as shown in fig. 1 and 3, causes the pin to be guided by the descending arc in synchronism with the action of the spring and to return to the flush position with the panel. The reverse counterclockwise rotation in turn causes the pin to return to the extended state via the illustrated raised arc.

In fig. 4 and 5, the pins 6, 7 are opposite each other along the threshold centre line 18 and are in a position flush with the panel 1, so that the door 19 can be opened freely in both directions. When the door 19 is not in use, it is positioned generally between the pins 6, 7 as shown, this may be achieved by any suitable means, such as a hydraulic closure, and the lock does not have to be located completely above the centre line 18 when it is initially locked. In locking, the motor 17 drives the panel 1 in rotation in the direction shown in fig. 6, so that the pins 6, 7 are guided synchronously by the ascending arc to lock the two sides of the door 19. Since the pins 6, 7 are symmetrically arranged along the centre line 18, the door 19 will automatically be positioned completely on said centre line as shown in fig. 6, 7. A solenoid pin 20 is then inserted into a hole in the housing 10 to prevent reverse rotation from the locked position. The above steps are reversed to unlock the door. With the solenoid pin 20 unlocked, the motor 17 drives the housing 10 and the panel 1 to rotate in reverse, the pins 6, 7 being synchronously guided by their descending arcs to a position flush with the panel 1, thus releasing the locking of the door 19.

In the installation of a double-acting sliding door, as shown in fig. 8 and 9, the pins 6, 7 lock the doors 21, 22 with the aid of hooks 23, 24 or integral leaves with similar shape features.

Preferably, the operation of the solenoid pin 20 may be configured to be "locked after power-on" or "unlocked after power-on". The solenoid is controlled by a printed circuit board system.

Preferably, an unlocking method in an emergency state is also provided. Thereby, the cover 10 and the panel 1 can be rotated by pushing the door 19 until the pins 6, 7 are guided by their descending arcs to retract below the bottom edge of the door, thereby releasing the locking means.

The preferred place for mounting the lock is a circular cavity drilled into the door sill as far as possible from the door hinge or pivot (in the case of a revolving door) or in the normal lock mounting position (in the case of a sliding door) and the cylindrical lock housing 3 and the locating pin 4 are fixed therein by a pouring box 5. The electrical wiring is preferably embedded in the floor and routed into the bore cavity for connection to the lock assembly. Preferably, the lock assembly is connected to the wire and then placed in the housing 3. And then a fixing plate is used to connect the assembly and the shell into a whole.

The phase lock is important with respect to the orientation of the door. The maximum float of the door is preferably controlled to be about + -5 mm when the pin is raised. The descending arc of the pin is located on the same side as the door is locked when unlocking.

Preferably, the lock is compatible with most access control systems and has the additional features required by such systems. Preferably, although not necessarily, the voltage of the latch is between 12 and 14 volts. Upon receiving the lock command, the electronic device preferably waits until the door 19 or the doors 21, 22 are in proper proximity. This can be accomplished by using a magnet fixed to the edge of the door to align the hall effect in the panel, housing or case panel of the lock. After positive access to the door position, the motor 17 rotates the cover and panel to raise the pins 6, 7 to stop, position and secure the door. When the door is opened, the access control system signals the solenoid pin 20 to retract and once again drive the motor 17 to reverse the process.

It is therefore believed that the present invention, at least in this embodiment, provides a new and improved lock capable of central self-positioning for use with bi-directional revolving or sliding doors. It is to be understood, however, that the described embodiment is merely a generally preferred form of the invention and that various modifications may be made by those skilled in the art. For example, the shape of the lock housing, the arrangement of the face plate and cam body, the type of electronic device, and the mounting steps may be varied as desired.

Claims (10)

1. A lock for a double swing or slide door, the lock comprising at least two pins spaced apart by a distance greater than the thickness of the door and adapted for simultaneous arcuate rotational movement about an axis between the at least two pins and longitudinal movement between retracted and projecting positions, whereby, when the lock is in use and the at least two pins are moved from the retracted position to the projecting position, an edge of the door is engaged by at least one of the at least two pins when the door is in a position offset from a centre line of a threshold, so that the door is secured in position on the centre line of the threshold.

2. The lock of claim 1, wherein the at least two pins are moved longitudinally by engaging the inclined cam surface.

3. The lock of claim 2, wherein the at least two pins move longitudinally through spaced holes in a circular panel rotatable about the axis.

4. A lock as claimed in claim 3, wherein the cam surface is designed to: rotation of the panel in one direction corresponds to longitudinal movement of the at least two pins to the protruding position, and rotation of the panel in the opposite direction corresponds to longitudinal movement of the at least two pins to the retracted position.

5. The lock of claim 4, wherein an electric motor is mounted within the lock housing that rotates said face plate.

6. The lock of claim 4, wherein there is a solenoid pin extendable into said panel to secure said panel against rotation when said at least two pins are in said protruding position.

7. A lock as claimed in claim 5, wherein the housing is cylindrical and is shaped for mounting in a grout box or cavity located in the door sill.

8. The lock of claim 6, wherein the solenoid pin is configured to be energized to lock and to be energized to unlock.

9. The lock of claim 1, wherein the arcuate movement about the axis extends 90 degrees.

10. A bi-directional swinging or sliding door fitted with a lock according to claim 1.