AU2004203232A1 - Security door escape lock - Google Patents

Description

Regulation 3.2

AUSTRALIA

Patents Act 1990 COMPLETE SPECIFICATION FOR A STANDARD PATENT

(ORIGINAL)

Name of Applicant: Actual Inventor(s): Address for Service: Invention Title: R.A.M. SECURITY LOCKSMITHS PTY. LTD.

RICHARD GREG PULEIO MICHAEL PULEIO DARREN MICHAEL PULEIO SANDERCOCK COWIE SUITE 8C, 50-54 ROBINSON STREET DANDENONG VIC 3175 SECURITY DOOR ESCAPE LOCK Details of Associated Provisional Application(s): No(s): Australian Provisional Application No. 2003903685 Filed: 16 h July, 2003 The following statement is a full description of this invention, including the best method of performing it known to us: -1- Fc2004-07-16,A:\503ramfile.wpd, I la- TITLE: SECURITY DOOR ESCAPE LOCK FIELD OF THE INVENTION This invention concerns security screen door locks.

BACKGROUND OF THE INVENTION Locks on security doors permit a householder to lock the door with a key on leaving the building. The lock usually has provision for the householder to cancel the lock so that they can open the security door from the inside and leave the building. Consequently, 2004-07-16AA:Or. cap. wpd, 1 such locks have a snib on the inside of the door which cancels the lock without the need to use a key. If the door has been locked from the outside, for example by a spouse leaving for work and the main door is closed by a deadlock, the occupants of the home are not able to leave the house, except through the windows.

If a fire occurs in the building during this period, the occupants are at risk. This invention addresses that problem.

SUMMARY OF THE INVENTION This invention provides a key operated security door lock which is capable of being locked by a key from outside the door and cancelled from inside the door by operation of the inside door handle.

Normally both handles work in unison being mounted on a common spindle. In this invention the spindle is split allowing the inside handle to turn independently. The outside handle is not connected to the bolt and cannot admit persons to the building by cancelling the bolt from the outside. The inside handle may retract the bolt against spring means which tends to advance the bolt.

The lock may have a slide which is operable by both the inside handle and the key, the slide being capable of unlocking the bolt.

The outside handle is incapable of operating the bolt.

The slide may have means to prevent the bolt from retracting and means to retract the bolt.

The means to prevent the bolt retracting may be a bolt arrester. The arrester is moved by the key locking action to obstruct the bolt and prevent it retracting until the key is reinserted and turned.

The means to retract the bolt itself may be a finger which engages the bolt and withdraws 2004-07. tI6,AASO0ramcap.wpd,2 it from the keeper.

BRIEF DESCRIPTION OF THE DRAWINGS Two embodiments of the invention are now described with reference to the accompanying drawings, in which:- Figure 1 is a perspective view of the lock fitted to a screen door.

Figure 2 is a diagrammatic side view of the lock mechanism of Figure 1 fitted to a security door.

Figure 3 is a perspective view of the lock mechanism with a bolt advanced to the lock position.

Figure 4 is a diagram of the lock mechanism of Figure 3 with the bolt retracted by rotation of the inside door handle.

Figure 5 is a diagram of the lock mechanisms of Figure 4 with the bolt advanced by operator of the key.

Figure 6 is a perspective view of a security door made of hollow aluminium extrusions prepared to receive the lock.

DETAILED DESCRIPTION WITH RESPECT TO THE DRAWINGS Referring now to Figures 1 and 2, a lock body 2 is covered by an inside cover plate 4 and an outside cover plate 6. Each of the plates has an aperture for a cylinder lock 8. The inside and outside plates each have a conventional hub assembly 10 or an inside handle 12 and an outside handle 14. Both assemblies support separate square section stub shafts 16, 18, which meet at the centre of the lock body. The inside plate has a pair of parallel guides (not shown) for apop-up indicator strip 20 bearing the word LOCKED. The strip is accessible to the lock mechanism through a window 22 in the lock body. The locking 2004-07-16.A:%500ram.cap.wpd,3 bar has a projection (not shown) which lifts the foot of the strip.

The lock body is a shallow rectangular tray 24 with a face 26 for screwing to a security door and an opposite wall 28. Corner posts 30 receive screws to attach the plates. Both plates have a lock cylinder aperture 32 to take the cylinder lock 8 and a handing window 22. Cam 36 extends from the cylinder barrel. Bolt 38 slides in and out of the lock body biassed by spring 40. Auxiliary bolt 42 overlies bolt 38 and operates conventionally, biassed by spring 44 to increase the extension of bolt 38 into the strike when the door closes.

Bolt 38 is spaced from wall 28 at all times. Bolt 38 has a recess 46 which accommodates the head of a drive lever 48 mounted on shaft 18 (see Figure The tail of the lever lowers locking bar 50 which is a slide fit between face 26 and wall 28. The nose 52 of the locking bar is intended to lie rearward of the bolt and the leg 54 of the bar has a notch 56 opposite the cam 36. The cam raises the slide to the lock position in Figure 4 and the drive lever lowers the locking bar by reacting against inclined block 58. Block 58 is screwed to a recess in the leg of the locking bar by removable screw 60. A duplicate drive lever 62 is mounted on stub shaft 16 and the block 58 is accessible through the window 22 to reverse the hand of the lock.

In use the security door is closed by handle 14 and locked using the key. Cam 36 raises the locking bar to the position shown in Figure 5 such that the nose prevents retraction of the bolt 38. Handle 14 is unconnected to the locking bar because the block 54 is actuated only by the inside handle 12. If the occupant of the building wishes to open the door, handle 12 is turned. The drive lever depresses the locking bar returning the cam to the position shown in Figure Referring now to Figure 5, this embodiment is intended to be retrofitted to the hollow aluminium style 70 of a security door. Slot 72 is cut in the door edge. The shank bore 74 and the keyhole 76 are drilled in the face of the style. The lock body is inserted in the slot 72 and the key assembly is inserted into the keyhole.

It is to be understood that the word "comprising" as used throughout the specification is 2004-07.16,A:\OOwn cap.wpd,4 to be interpreted in its inclusive form, ie. use of the word "comprising" does not exclude the addition of other elements.

It is to be understood that various modifications of and/or additions to the invention can be made without departing from the basic nature of the invention, these modifications and/or additions are therefore considered to fall within the scope of the invention.

2004-07-16,A: \OOm.

Claims (9)

1. A security door lock having an inside manually operable means and an outside manually operable means which turn independently, a key operable lock and coupling means connecting the handle operation and the lock operation, whereby when the door is subject to locking action from outside the door by use of a key, the door is capable of being unlocked from inside the door by turning the inside manually operable means.

2. A security door lock as claimed in Claim 1, wherein the key actuates a slide in one direction to obstruct bolt retraction and the inside handle actuates the slide in the opposite direction to remove the obstruction and allow bolt retraction.

3. A security door lock as claimed in Claim 2, wherein the slide has a bolt arrester which in the locked position lies in the path of the bolt.

4. A security door lock as claimed in Claims 1-3, wherein the inside handle turns a drive lever which activates the slide to move the bolt arrester out of the path of the bolt before the drive lever moves the bolt.

A security door lock as claimed in Claims 1-4, wherein the driver lever acts upon a ramp face of the slide in order to produce slide movement.

6. A security door lock as claimed in Claims 1-5, wherein the ramp face is part of a removable lock handing member which is relocatable to a position in the path of the drive lever of the opposite handle in order to reverse the hand of the lock.

7. A security door lock as claimed in Claim 1-6, wherein the lock is a cylinder lock and a spur projects from the lock and engages a notch in the slide as the key turns thereby causing the bolt arrester to obstruct the retraction of the bolt.

8. A security door lock as claimed in Claims 1-7, wherein the inside face of the lock has a cover plate with a visual indicator of the locked condition.

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9. A security door lock as claimed in Claim 8, wherein the indicator is a pop-up indicator normally concealed within the cover plate. A security door lock as claimed in Claim 9, wherein the lock is lockable from inside the door to which the lock is fitted by a turn knob. 11. A security door lock as claimed in any one of Claims 1-10, wherein an auxiliary bolt promotes the advance of the bolt. 12. A lock for a security door, lock with a lock housing, a main bolt movable between an extended position in which the bolt extends from the housing and engages the strike in a door style and a retracted position where it lies at least partially within the housing and is free of the strike, a slide member movable between a locking position where the slide member obstructs the retraction of the bolt and an unlocked position where the bolt is free to move to the retracted position, manually actuable means operable from one side of the housing to drive the slide to the unlocked position and key operated means operable from the opposite side of the housing to drive the slide to the locked position. 13. A security door lock substantially as herein described with reference to and as illustrated in Figures 1-4 or as modified by Figure Dated this 16 th day of July, 2004. SANDERCOCK COWIE PATENT ATTORNEYS FOR R.A.M. SECURITY LOCKSMITHS PTY. LTD. 2004 -07-16,A:\SOor cap.wp 7