AU656818B2 - Improvement to deadlocks - Google Patents

Description

AUSTRALIA

Patents Act 1990 COMPLETE SPECIFICATION FOR A STANDARD PATENT Name of Applicant: Actual Inventor: Address for Service: WHITCO PTY. LTD.

MERVYN GEORGE HARCOURT CULLEN CO., Patent Trade Mark Attorneys, 240 Queen Street, Brisbane, Qld. 4000, Australia.

Invention Title: IMPROVEMENT TO DEADLOCKS The following statement is a full description of this invention, including the best method of performing it known to us: 0* 0 00 0 S 0 2 THIS INVENTION relates to an improvement or modification to the deadlock of our earlier Australian Patent 611033.

The deadlock of our earlier Australian patent was one which could be bought as a separate unit and could be attached to an existing door to provide improved security. Of course, the door already possessed a door latch set and therefore the deadlock was an additional lock assembly to the door latch set. Usually, the deadlock was positioned on the door below the door latch set.

The deadlock of our earlier patent included a knob and a key cylinder positioned on the inside of the door, and only a key cylinder positioned on the outside of the door.

A key could be inserted into the key cylinder on the outside of the door and turned. When the key was turned, the go•O•• S lock bolt and auxiliary bolt were caused to retract. However, in our earlier patent, there was no provision to keep the bolt in the retracted position except by maintaining a turning force on the key.

Therefore, opening the door was a two handed affair with one hand required to open the existing door knob, and the other hand required to maintain a turning force on the key in ooeoo the deadlock. This was found to be generally inconvenient as 9 people holding shopping bags or the like could not open the 4 0"• door with one hand.

The deadlock of our earlier Australian patent did include a hold back lever 35 to retain the lock bolt in its retracted position; however, this lever was pushed down to a disengaged position upon insertion and turning of the key into 3 the key cylinder on the outside of the door.

The hold back lever was disengaged due to the second operating member 98. This member had a generally curved caming surface between notches 104 and 3.05. Rotation of the second operating member 98 in an anti-clockwise direction caused the caming surface to push down hold back lever 35 upon retraction of the lock bolt. There was therefore no ability for the hold back lever to hold back the lock bolt.

We have now improved or modified the design of our deadlock by removing the caming surface from second operating member 98. Thus, rotation of the second operating member in an anti-clockwise direction still causes the lock bolt to retract but this time the hold back lever 35 can be caused to 0O 0o engage the lock bolt in a hold back position.

:0 00 0 Thus, with our improvement or modification, a person can simply insert a key into the key cylinder on the outside of the door and turn the key to retract and hold back the lock 0S bolt. Thereafter, the person can remove the key and operate the existing door knob. Thus, the entire operation can now be done with one hand rather than two hands.

0.

The retracted lock bolt can be released to its extended position upon rotation of the internal knob in a manner which is disclosed in our earlier patent.

•ooeo 0 Figures 1 to 7 illustrate the deadlock of our 24.: earlier Australian Patent 611033 and shows the improvement or modification made to separate second operating member 98.

The same reference numerals have been used as with the earlier Australian patent and the earlier Australian patent is incorporated herein by suitable cross reference.

4 The second operating member 98 according to the improvement or modification does not include the generally circular caming surface between notches 104 and 105 as is present in our earlier Australian patent.

Furthermore, projection 101 has been modified to a pair of separate spigots 101.

When the deadlock is fitted to a door, a key cylinder is fitted to the outside of the door with the key cylinder finger extending into slot 103 of second operating member 98. Rotation of a key in the key cylinder causes corresponding rotation of the finger which in turn causes rotation of second operating member 98. Upon this rotation, the lock bolt is retracted in a manner already described in our Australian patent but this time hold back lever 35 does not engage with the caming surface of second operating member so-goo S* 98. Thus, when the lock bolt is retracted, and the lock component adopts the position as illustrated in Figure 7, the hold back lever 35 can now adopt its engaging position and hold back the lock bolt.

To extend the lock bolt, it is only necessary to rotate knob 20 on the inside of the door in the appropriate manner. Knob 20 can also be rotated to retract the bolt 2 to keep the bolt in the hold back position. Both the kob and the outside key can cause the bolt to be released and returned to its extended positions.

Various other changes or modifications may be made without departing from the spirit and scope of the claims.

Claims (2)

1. A deadlock as claimed in any one of claims 54 to 58 of Australian patent 611033, the improvement or modification being that upon sufficient rotation of the second operating member, the hold back lever engages with the main bolt in the hold back position.

2. A deadlock substantially as hereinbefore described with reference to the accompanying drawings. DATED this Twenty-sixt day of August 1994. WHITCO PTY LTD by their Patent Attorneys CULLEN CO o* S* 0* 6 ABSTRACT An improvement or modification to the deadlock of Australian Patent 611033 where the second operating member (98) is formed without a caming surface thereby allowing hold back lever (35) to engage with the retracted lock bolt. S- 49 go 0 V a Q o S. a