AU594069B2 - A dead lock mechanism - Google Patents

Description

I

;ib FORM 10 594069 SPRUSON FERGUSON COMMONWEALTH OF AUSTRALIA andment rts da uInd Setidon 49.

T- r.l Class Int. Class Application Number: PATENTS ACT 1952 COMPLETE SPECIFICATION

(ORIGINAL)

FOR OFFICE USE: 6 0O7/ PH1708 Lodged: 30 July 1985 Accepted: Published: PA1'l T1i'F VIC E 8 1A 31..

V, ir-q-Oj 8 Priority: Related Art: t 9 44 Name of Applicant: Address of Applicant: Actual Inventor: Address for Service: DORIC PRODUCTS PTY. LTD.

Lot 9, Redfern Street, Wetherill Park, New South Wales 2164, Australia PERRY RAYMOND LONG Spruson Ferguson, Patent Attorneys, Level 33 St Martins Tower, 31 Market Street, Sydney, New South Wales, 2000, Australia Complete Specification for the invention entitled: A DEAD LOCK MECHANISM The following statement is a full description of this invention, including the best method of performing it known to ine/us 47W/ww kUbTX±AL iA APOUVCAT.$N ACCPTED AND AMENDMFtTS -2 The present invention relates to locks and more particularly to deadlocking mechanisms of locks.

In locks which employ a tongue which is pivotally mounted so as to pivot about an axis generally perpendicular to the plane of the door, it is a problem that the mechanism which causes pivotting of the tongue can be tamperi'd with to cause withdrawal of the tongue, without the use of a key.

It is the object of the present invention to overcome or substantially ameliorate the above disadvantages.

There is disclosed herein a~ lock mechanism comprising a body, a tongue pivotally supported by the body so as to be pivotally movable about an axis from an extended locking position to a retracted position generally located within the body, an operating lever pivotally mounted within the body and h1aving one end operatively associated with said tongue to cause plvotting thereof upon pivotting of said lever, said lever being mounted for pivotting movement about an axis spaced from but parallel to the first axis of said tongue, an operating member movably supported within said body and pivotally attached to the other end of said lever, said operating member being adapted to be moved by a lock cylinder to cause pivotting of said lever to move said tongue, and deadlock means to selectively prevent movement of said operating member to retract said tongue.

A preferred form of the present invention will now be described by way of example with reference to the accompanying drawings, wherein: Fig. 1 is a schematic perspective view of a lock; Fig. 2 is a schematic side elevation of the lock of Fig. 1 with the tongue thereof in a retracted position; and Fig. 3 is a schematic side elevation of the lock of Fig. 1 with the S tongue extended in a lock position.

In tlic accompanying drawings there is schematically depicted a lock 3 0 10 having a hollow body 11 which rotatably supports a tongue 12 which is movable from a non-locking position generally located within the body 11 (Fig. 2) to an extended locking position projecting from within the body 11 (Fig. 3).

The tongue 12 is supported by a shaft 13 and is provided with a hollow 14 defined between two end flanges JLH/3682W ~4 Signature of Declarant Brian Watkins TO: THE COMMISSIONER OF PATENTS forming part of the tongue 12. The flanges 15 are provided with slots 16 which extend generally radially from the shaft 13. Alro pivotally mounted in the body 11 is an operating lever 17 which is pivotally mounted by means of a shaft 18 intermedi-te the ends of the lever 17, with one end of the lever 17 having spigots 19 slidably engaged within the slots 16. The hollow 14 is dimensioned to enable movement of a portion of the lever 17 within the hollow 14. The other end of the lever 17 is pivotally attached by means of a yoke assembly, to one end of an operating member 20. The operating member is rotatably and slidably located within the body 11 by means of a pin 21 slidably passing through a slot 22 formed in the member 20. The member 20 is provided with two projections 23 and 24 which are engaged by the tongue of a cylinder lock 26. Preferably the lock 20 would be provided with a pair of cylinder locks 26, one on each side of the lock 10. The projections 23 and 24 are engaged by the tongue 25 to cause movement thereof to in turn cause pivotting of the lever 17. There is further provided a '2 Q, deadlatch mechanism in the form of a pivotted lever 27 mounted on the shaft 21, The lever 27 has a catch portion 28 which selectively engages the projection 23 to prevent movement of the operating member 20. Additionally, the lever 27 is engaged by the tongue 25 to disengage the lever 27 from the projection 23.

In operation of the abovedescribed lock 10, the tongue 12 is movable between the two positions previously described. This movement of the tongue 12 is caused by pivotting of the lever 17 via movement of the operating member 20. The operating member 20 is caused to move by engagement of the tongue 25 upon rotation of the cylinder lock 26 by means of a key.

In the extended position of Fig. 3, the tongue 12 cannot be retracted without operation of a key. That is, the lever 27 engages projection 23 to inhibit movement of the lever 17 by preventing movement of the member It should be appreciated that there is provided a spring 29 which biasses the lever 27 into engagement with the 377t/ww 3 projection 23.

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Claims (9)

1. A lock mechanism comprising a body, a tongue pivotally supported by the body so as to be pivotally movable about an axis from an extended locking position to a retracted position generally located within the body, an operating lever pivotally mounted within the body and having one end operatively associated with said tongue to cause pivotting thereof upon pivotting of said lever, said lever being mounted for pivotting movement about an axis spaced from but parallel to the first axis of said tongue, an operating member movably supported within said body and pivotally attached to the other end of said lever, said operating member being adapted to be moved by a lock cylinder to cause pivotting of said lever to move said tongue, and deadlock means to selectively prevent movement of :aid operating member to retract said tongue.

2. The lock mechanism of claim 1 wherein said operating lever is pivotted intermediate its ends.

3. The lock mechanism of claim 1 or 2, wherein said operating member is pivotally supported by said body so as to be rotatable about a predetermined axis.

4. The lock mechanism of claim 3, wherein said operating member is i' also movable in a direction normal to said predetermined axis to cause pivotting of said operating lever.

The lock mechanism of claim 4, wherein said operating member is movable within a first position wherein said tongue is in said extended •4 t position, and a second position wherein said tongue is generally located within said body, and said operating member has an abutment engaged by said deadlock means when said operating member is in the first position thereof.

6. The lock mechanism of claim 5, including a further abutment located on said operating member, said abutments being positioned to be engaged by said lock cylinder to cause movement of said operating member between the first and second positions thereof.

7. The lock mechanism of claim 6, wherein said deadlock means is a lever pivotally mounted on said body and having an engaging portion positioned to engage the abutment engaged by said deadlock means.

8. The lock mechanism of claim 7, wherein said engaging portion is engaged by said cylinder lock to release the abutment engaged by said deadlock means.

9. The lock mechanism of claim 8, wherein said abutments are ALNprojections and said engaging portion Is a catch, and said operating member r 3LH/6 2W _tC i -6- is slidably and pivotally supported by means of a pin fixed to said body and passing through a slot in said operating member. A lock mechanism substantially as hereinbefore described with reference to the accompanying drawings. DATED this TWENTY-SECOND day of NOVEMBER 1989 Doric Products Pty Ltd Patent Attorneys for the Applicant SPRUSON FERGUSON JLH/3682W