GB2552502A

GB2552502A - Deadlock slamlock combination

Info

Publication number: GB2552502A
Application number: GB1612887.8A
Authority: GB
Inventors: Campbell Timothy
Original assignee: Trellicor Pty Ltd
Current assignee: Trellicor Pty Ltd
Priority date: 2016-07-26
Filing date: 2016-07-26
Publication date: 2018-01-31
Anticipated expiration: 2036-07-26
Also published as: GB2552502B; GB201612887D0

Abstract

A locking mechanism for a security door, the locking mechanism comprising a draw bolt lock mechanism housed within the security door (see Fig 11) and operable either by means of a key operated mechanism, e.g. a cylinder lock 32, or activable by means of engagement with a latch 46 located on the stile of the doorframe. The latch may have an arm 48 terminating in a wedge shaped head 50. When the door is shut the head 50 engages with the edge of a hook 42 located inside the lock body and displaces it. This consequently moves a latch plate 36 and causes the two draw bolt retaining plates 14 16 to move towards each other (Fig 8-10) moving the draw bolts into the locked position. The key lock 32 may have a rotatable cam (34) which engages with a toothed disk 28 and also causes the latch plate 36 to move.

Description

(54) Title of the Invention: Deadlock slamlock combination

Abstract Title: Locking mechanism operated by a key lock or a latch (57) A locking mechanism for a security door, the locking mechanism comprising a draw bolt lock mechanism housed within the security door (see Fig 11) and operable either by means of a key operated mechanism, e.g. a cylinder lock 32, or activable by means of engagement with a latch 46 located on the stile of the doorframe. The latch may have an arm 48 terminating in a wedge shaped head 50. When the door is shut the head 50 engages with the edge of a hook 42 located inside the lock body and displaces it. This consequently moves a latch plate 36 and causes the two draw bolt retaining plates 14 16 to move towards each other (Fig 8-10) moving the draw bolts into the locked position. The key lock 32 may have a rotatable cam (34) which engages with a toothed disk 28 and also causes the latch plate 36 to move.

FIGURE 7

At least one drawing originally filed was informal and the print reproduced here is taken from a later filed formal copy.

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10 16

FIGURE 1 co co

FIGURE 3

FIGURE 4

FIGURE 5

FIGURE 6

26 40

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39 36 42

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10 16

DEADLOCK SLAMLOCK COMBINATION

Field of the invention

This invention relates to a locking mechanism and in particular a combination deadlock/slam lock locking mechanism.

Background to the invention

Doors, gates and shutters are only as effective against intruders as their locking mechanisms.

Draw -bolt locks are popular in security shutters and gates as they provide multiple locking points in the lock stile while using a single keyhole. This provides the advantage to the user of only needing one key to lock or unlock the security gate, saving time when under stress in an emergency, while the multiple locking points provide maximum protection against attempted break-ins.

Draw bolt locks are usually activated by a dead lock, which requires a key with which to lock the gate or door. Such a draw bolt locking mechanism activated by a deadlock is described in South African Patent ZA 1999/07158.

Recently however, Slam locks have become a popular security option, as they effectively allow the user to lock the door, gate or shutter with a single sliding action, without needing to use a key to lock the gate or door.

A slam lock comprises an automatic lock system whereby as the gate/door is closed the lock mechanism is triggered, locking the gate without requiring the use of a key, and creating an effective barrier between the user and a would be assailant. However, slam locks on their own are not always as secure as deadlocks.

It is an object of this invention to provide a locking mechanism that provides the benefits of a drawbolt in combination with a slam lock and deadlock system.

The term security door is to be understood to mean any door, gate or shutter.

Summary of the invention

In accordance with this invention there is provided a locking mechanism for a security door, the locking mechanism comprising a draw bolt lock mechanism housed within the security door and operable either by means of a key operated mechanism or activable by means of engagement with a latch located on the stile of the door.

There is further provided for the draw bolt lock mechanism to comprise a housing supporting at least one slidable draw bolt retaining plate and a latch plate, the latch plate being movable between a first position in which the latch plate prevents sliding movement of the draw bolt retaining plate and a second position in which the draw bolt retaining plate is free to slide;

wherein movement of the latch plate between the first and second positions may be effected either by rotation of the cam of a profile cylinder lock supported in the housing, or by engagement of the latch plate with the latch located on the stile.

There is also provided for the latch plate to comprise a substantially planar body, slidably located on a spindle in the housing such that an edge of the latch plate abuts the cam of the profile cylinder lock, and having an arm extending from the body for engagement with the latch.

There is further provided for the arm of the latch plate to comprise a bevelled hook and the leading end of the latch to be wedge shaped, with a notch located behind the wedge.

Communication between the slidable draw bolt retaining plate and the latch plate may be effected by a rotatable toothed disk locatable between the draw bolt retaining plate and the latch plate, the teeth of disk being configured to receive pins extending from the draw bolt retaining plate.

There is also provided for the latch plate to engage with at least one tooth on the toothed disk to prevent rotation thereof when the latch plate is in the first position and for the latch plate to be disengaged from the at least one tooth on the toothed disk to allow rotation of the disk, and subsequent movement of the draw bolt retaining plate, when the latch plate is in its second position.

The latch plate may be biased into engagement with one or more teeth of the disk, and the biasing means may comprise a spring.

In a preferred embodiment of the invention, there is provided a pair of draw bolt retaining plates, simultaneously slidable in the housing in opposite directions, both draw bolt retaining plates carrying pins engagable with teeth located on opposite sides of the toothed disk, for the draw bolt retaining plates to be biased towards one another, and for the biasing means to comprise a tension spring.

Brief Description of the Drawings

A preferred embodiment of the invention is described below by way of example only and with reference to the following drawings, in which;

Figure 1 is an exploded view of the lock mechanism of the invention

Figures 2 to 6 show elevations of the lock mechanism with the cam at different degrees of rotation

Figures 7 to 10 show elevations of the lock mechanism with the latch mechanism at different points of insertion

Figures 11a and 11b are perspective views of the lock mechanism showing the operation of the deadbolts from an unlocked position (figure 11a) to a locked position (figure 11b).

Detailed description with reference to the drawings

The draw bolt locking mechanism (10) is usually mounted in a sliding security gate or shutter (not shown).

Referring to figure 1, the configuration of the deadlock mechanism is described.

The mechanism (10) is housed within a housing (12) protected by a coverplate (13). A pair of draw bolt retainer plates (14) and (16) are slidably mounted in the housing, and biased towards one another by a tension spring (18). The ends of the retainer plates closest one another each terminate in an arm (20), (22) extending down opposite sides of the housing. Pins (24), (26) extend from the arms (20) (22).

A toothed disk (28) is rotatably supported on a spindle (30) in the housing (12) between the arms (20) (22) of the draw bolt retainer plates (14) (16). The teeth on the disk (28) engage the pins (24) (26). Referring to figures 11a and 11b, draw bolts (60) extend from the draw bolt retainer plates (14).

A cylinder lock (32) with a rotatable cam (34) is fitted in the housing, such that the cam (34) interacts with the toothed disk (28). The cylinder lock extends through both sides of the housing so that it may be operated by a key on either side of the door or shutter. In this example, the cylinder lock is a Euro Profile cylinder.

A latch plate (36) is fitted on the spindle (30) over the toothed disk (28), and includes a slot (37) to allow the latch plate to slide vertically in the housing. The lower ledge (38) of the latch plate abuts the cam (34) of the cylinder lock, a fork shaped protrusion (39) extends from the inner face of the latch plate, towards the toothed disk for trapping a tooth (40) of the disk (28) and preventing rotation of the disk. A spring (41) located about the spindle and connected to the latch plate (36), biases the latch plate (36) towards the toothed disk.

The operative upper end of the latch plate terminates in a hooked arm (42) facing an opening (44) in the housing (12).

A latch (46) is located in the receiving stile (not shown) of the sliding security door. The latch (46) comprises an arm (48) terminating in a wedge shaped head (50), with a notch (52) located behind the head (50).

Referring to figures 2 to 6, and illustrating use of the deadlock, rotation of the cam (34) in the cylinder lock (32) in a clockwise direction causes the cam (34) to contact the latch plate (36) and slide the latch plate upwards, releasing the tooth (40) of disk (28) to allow rotation of the disk (28). Further rotation of the cam (34) causes rotation of the toothed disk (28), which then acts on the pins (24) (26) on the retainer plates (14) (16), moving the plates towards each other, from their position in figure 2 to their position in figure 6. This in turn pulls the draw bolts inwards, into a locked condition as depicted in figure 11b

Referring to figure 4, and once rotation of the cam (34) is complete, the latch plate (36) is free to slide back down. The spring (41) pulls the latch plate back down so that the protrusion (39) engages with another tooth on the disk (28), preventing rotation of the disk and maintaining the locking mechanism in its locked state (figure 11b).

To reverse the operation, the cylinder is rotated in the opposite direction, causing rotation of the cam (34) and subsequently the toothed disk (28) in the opposite direction.

Referring to figures 7 to 10 and illustrating the use of the slam lock, when the latch plate (36) is in its rest position, a tooth (40) of the disk (28) is trapped between the forked protrusion (39) extending from the inner face of the latch plate. This prevents rotation of the disk, and in turn prevents the retainer plates (14) (16) and subsequently the draw bolts (60) from moving/ sliding towards one another, maintaining the draw bolt mechanism in an unlocked state (figure 7 and figure 11a).

Referring to figures 8 and 9, as the door is pulled into its closed position in the frame (62) (figure 11b), the latch (46) extends into an opening (44) in the housing (12), and moves into contact with the hooked arm (42) of the latch plate (36). As the wedge shaped head (50) of the latch (46) moves into contact with the hooked arm (42) of the latch plate (36), the wedge pushes the latch plate (36) upwards releasing the tooth (40) of disk (28) from protrusion (39) to allow rotation of the disk (28).

Referring to figure 9, tension spring (18) biases the draw bolt retainer plates (14) (16) toward each other, and because the toothed disk (28) is free to rotate, the retainer plates (14) (16), are able to move towards each other from their position in figure 7 to their position in figure 10, effectively drawing the bolts 60 together and into a locked state (figure 11b).

Referring to figure 10, as the latch (46) moves further into the housing, the hooked arm (42) of the latch plate (36) slides down behind the head (50) into the notch (52). The spring (41) biases the latch plate downwards, trapping a tooth (40) of the disk (28) between the protrusion (39) extending from the inner face of the latch plate, and preventing further rotation of the disk. This in turn prevents the retainer plates (14) (16) from being moved apart without the operation of a key in the cylinder profile to activate rotation the cam (34).

The invention therefore provides a combination deadlock and slam lock locking mechanism.

Claims

Claims: 1. A locking mechanism for a security door, the locking mechanism comprising a draw bolt lock mechanism housed within the security door in which the draw bolt lock mechanism is operable either by means of a key operated mechanism or activable by means of engagement with a latch located on the stile of the doorframe. 2. The locking mechanism as claimed in claim 1 in which the draw bolt lock mechanism comprises a housing supporting at least one slidable draw bolt retaining plate and a latch plate which is movable between a first position in which the latch plate prevents sliding movement of the draw bolt retaining plate and a second position in which the draw bolt retaining plate is free to slide. 3. The locking mechanism as claimed in claim 2 in which movement of the latch plate between the first and second positions is effected either by rotation of the cam of a profile cylinder lock supported in the housing, or by engagement of the latch plate with the latch located on the stile. 4. The locking mechanism as claimed in claim 3 in which the latch plate comprises a substantially planar body, slidably located on a spindle in the housing such that an edge of the latch plate abuts the cam of the profile cylinder lock, the planar body including an arm extending therefrom for engagement with the latch. 5. The locking mechanism as claimed in claim 4 in which the arm of the latch plate terminates in a bevelled hook. 6. The locking mechanism as claimed in any of claims 1 to 5 in which the leading end of the latch is wedge shaped, with a notch located behind the wedge. 7. The locking mechanism as claimed in any of claims 2 to 6 in which communication between the slidable draw bolt retaining plate and the latch plate is effected by a rotatable toothed disk locatable between the draw bolt retaining plate and the latch plate, the teeth of disk being configured to receive pins extending from the draw bolt retaining plate. 8. The locking mechanism as claimed in claim 7 in which the latch plate is engaged with at least one tooth on the toothed disk to prevent rotation thereof when the latch plate is in the first position, and the latch plate disengaged from the at least one tooth on the toothed disk to allow rotation of the disk, and subsequent movement of the draw bolt retaining plate, when the latch plate is in its second position. 9. The locking mechanism as claimed in either of claims 7 or 8 in which the latch plate is biased into engagement with one or more teeth of the disk by a biasing mechanism. 10. The locking mechanism as claimed in claim 9 in which the biasing mechanism is a spring. 11. The locking mechanism as claimed in any of claims 7 to 10 in which the draw bolt lock mechanism comprises a pair of draw bolt retaining plates, simultaneously slidable in the housing in opposite directions, both draw bolt retaining plates carrying pins engagable with teeth located on opposite sides of the toothed disk and the draw bolt retaining plates being biased towards one another by a tension spring. Amendments to the claims have been made as follows: Claims: 05 12 17

1. A locking mechanism for a security door, the locking mechanism comprising a draw bolt lock mechanism houseable within a portion of the security door, wherein the draw bolt lock mechanism comprises a housing supporting at least one slidable draw bolt retaining means connectable to a draw bolt, the retaining means being slidable between a locked and unlocked condition; and the draw bolt lock mechanism further comprising a controlling member for controlling the sliding movement of the draw bolt retaining means, the controlling member being movable between a first position in which the controlling member prevents the sliding movement of the draw bolt retaining means, and a second position in which the draw bolt retaining means is free to slide, and wherein movement of the controlling member between the first and second position is effected by the rotation of a cam member of a key operated mechanism which is supported in the housing, such that the draw bolt lock mechanism is operable by means of a key, and/or the movement of the controlling member from the first position to the second position is effected by means of engagement of a portion of the controlling member with a latch locatable on a stile of a frame supporting the door, such that the draw bolt lock mechanism is operable by means of the latch.

2. The locking mechanism as claimed in claim 1 or 2 in which the controlling member is a latch plate.

3. The locking mechanism as claimed in claim 1 in which the key operated mechanism includes a profile cylinder lock.

05 12 17

4. The locking mechanism as claimed in claim 2 or 3 in which the latch plate comprises a substantially planar body, slidably located on a spindle in the housing such that an edge of the latch plate abuts the cam of the profile cylinder lock, the planar body including an arm extending therefrom for engagement with the latch.

5. The locking mechanism as claimed in any one of claims 2 to 4 in which the arm of the latch plate terminates in a bevelled hook.

6. The locking mechanism as claimed in any one of claims 2 to 5 in which communication between the slidable draw bolt retaining plate and the latch plate is effected by a rotatable toothed disk locatable between the draw bolt retaining plate and the latch plate, the teeth of the disk being configured to receive pins extending from the draw bolt retaining plate.

7. The locking mechanism as claimed in claim 6 in which the latch plate is engaged with at least one tooth on the toothed disk to prevent rotation thereof when the latch plate is in the first position, and the latch plate is disengaged from the at least one tooth on the toothed disk to allow rotation of the disk, and subsequent movement of the draw bolt retaining plate, when the latch plate is in its second position.

8. The locking mechanism as claimed in either of claims 6 or 7 in which the latch plate is biased into engagement with one or more teeth of the disk by a biasing mechanism.

9. The locking mechanism as claimed in claim 8 in which the biasing mechanism is a spring.

05 12 17

10. The locking mechanism as claimed in any of claims 6 to 9 in which the draw bolt lock mechanism comprises a pair of draw bolt retaining plates, simultaneously slidable in the housing in opposite directions, both draw bolt retaining plates carrying pins engagable with teeth located on opposite sides of the toothed disk and the draw bolt retaining plates being biased towards one another by a tension spring.

11. The locking mechanism as claimed in any one of the preceding claims in which the leading end of the latch is wedge shaped, with a notch located behind the wedge.

12. A security door and frame arrangement, the arrangement including a security door, a security door frame, and a locking mechanism as claimed in any one of the preceding claims.

Intellectual

Property

Office

Application No: GB1612887.8 Examiner: Mr Philip Lawrence