GB2216944A - Cylinder lock fittings - Google Patents

Abstract

A fitting assembly for a cylinder lock (5) mounted on a lock housing (6) comprises two mutually separate sections, namely a body (2) having an escutcheon or an end plate (2a) and two parts (2b) which extend along the cylinder lock, these parts having a circular-sector profile for instance, and a flanged barrel (3) which surrounds the body. The body is secured to the housing (6) by means of screws (7). If an attempt is made to break away the fitting or its anchorage by force with the aid of a suitable tool, the outwardly located barrel (3) will rotate relative to the body (2), therewith rendering the attempt ineffective. The barrel also offers protection against drilling of the lock in an attempt to force an entry. <IMAGE>

Description

Cylinder lock fittings Tbe present invention relates to a fitting for a cylinder lock of the kind wbicb is mounted on a lock mechanism bou- sing in, for instance, a door and which projects outwardly from the door, and which fitting assembly includes a body that has an end plate or surface, preferably a circular end plate or surface, which partially covers the part of the lock that protrudes outwardly from the door and which incorporates a bole tbrougb wbich a key can be inserted into a key slot in the lock plug and which body bas an inner profile wbicb conforms to the outer profile of the lock and has parts whicb extend along said outer profile and which body is secured to the door, either directly or indirectly, by means of screws which pass through the lock housing.

A cylinder lock fitting assembly of this kind is made of a bard material, sucb as steel for instance, and is intended to serve two purposes, i.e. to provide an aesthetic attachment on the outside of the door and also to protect the lock against forced entry through a locked door by attacking the lock mechanism with the aid of a drill, pipe wrencb, pliers or similar tool.

SE-B-7416187-8 (GKN-Stenman) teacbes a lock fitting assembly of this kind. This known fitting is in the form of a frustoconical metal body which is mounted on a door, either directly or via a spacing ring, and is secured with the aid of screws which extend from the inside of the door.

This type of fitting only embraces that part of the cylinder lock whicb protrudes on the outside of the door, and consequently it is possible to attack the lock, for instance, with the aid of a drill, by drilling obliquely inwards towards the lock from one side of the fitting.

Although the conical sbape of the fitting makes it difficult to grip the fitting with a pipe wrencb or like tool, it is nevertheless still possible to grip the fitting with sucb a tool and - by applying a powerful force - to rip the fitting loose from its screws. Once baving removed the fitting, it is a relatively simple matter to force open or to drill the lock.

SE-B-426 722 (GKN-Stenman AB) teaches a reinforced cylinder lock fitting assembly which comprises two frusto-conical parts, each of wbicb is fitted on a respective side of a door and wbicb are interconnected by a plurality of strong and powerful screws. Tbe screw beads can only be reached from one side, by a person who possesses a key which fits the lock. To tbis end, the key is turned to a given angle in the lock, e.g. to a 10 o'clock position, at which a cover plate which covers the screw beads can be removed so as to provide access to the screw heads.

The large number of powerful screws used in conjunction with this type of fitting make it extremely difficult to force the fitting. However, even though the fitting and the screws may conceivably resist the force exerted by a powerful wrencb, tbere is a serious danger that the actual door itself will be broken in the attempt, in which case neitber the fitting nor the lock will serve to prevent entry through the door.

US-A-3,965,910 (McCurdy) teaches a fitting assembly of the kind set forth in the preamble of claim 1 of this specification.

Should an attempt be made to force the fitting assembly with the intent to break the screws, all that will be achieved is that the outwardly located part of the fitting will rotate freely in relation to the body screwed to the door, therewith making the attempt ineffective.

Tbis type of fitting, however, also suffers some of the aforesaid drawbacks.

Similar drawbacks are also encountered with other types of known cylinder lock fittings of the aforesaid kind or like kinds, e.g. the fittings described in US-A-3,751,953 (Newman) or US-A-4,708,007 (Stoia).

A prime object of the present invention is to provide a cylinder lock fitting assembly of the aforesaid kind which is difficult or impossible to force with a pipe wrench or like tool and which will also provide satisfactory protection against drilling of the lock.

Anotber object of the invention is to provide a cylinder lock fitting assembly of the aforesaid kind which has a decorative and attractive outer appearance and which can be readily manufactured.

These and other objects are fulfilled with a fitting assembly of the aforesaid kind which, in accordance with the invention, is characterized mainly in that the barrel has integral therewith a flange which includes an annular abutment which accommodates the end plate of the body, and in that part of the barrel extends into the recess in the door.

This renders forcing of the actual body practically impossible, since the only part of the body wbicb can be seen from the outside is the aforesaid end surface, wbicb is preferably round and which is accommodated in the barrel and therewith practically unreachable with a tool.

In order to facilitate mutual rotation between the two parts, the body parts which extend along the outer profile of the cylinder lock will preferably include surfaces of circular-cylindrical configuration and will have a radius which corresponds to the inner radius of the barrel.

By corresponds to" is meant a radius which is somewhat smaller than the inner radius of the barrel, i.e. such as to enable the aforesaid rotation between the two parts to take place.

Tbe inventive fitting assembly can be used irrespective of the configuration of the cylinder lock concerned. Tbe only essential criterion is that the aforesaid inner surfaces of the body are adapted to the outer profile of the lock used.

Wben a round cylinder lock is used, the body parts wbicb extend along the lock will thus have a round configuration.

In tbis case, the relevant part of the body may consist of a single continuous part provided with a recess which receives a corresponding part of the cylinder lock.

Witb cylinder locks which have the above or similar configurations, the relevant parts of the body will have a corresponding shape and tbey may comprise separate parts of, e.g., part-spberical cross-section, which project from the circular-cylindrical end part or plate of the body.

Tbis will apply, for instance, wben the cylinder lock bas an elongated configuration with substantially flat side surfaces.

Because the lock is normally fastened to the lock bousing, the sbape of the axially extending parts of the body need not necessarily conform exactly with the configuration of the cylindrical lock, and a given degree of variation can be allowed in this respect. By the expression '1parts which are adapted to the outer profile of the cylinder lock" is meant primarily that said parts will not encroacb on the space in wbicb the lock is accommodated. Tbe parts will normally extend closely adjacent to or preferably contiguous with the lock, although this is not an absolute requirement.

Expressed differently a given standard form of said body parts may correspond to different types of cylinder lock of varying configurations.

Tbe only essential criterion is that the body is anchored, which is achieved primarily by the screws tbreaded through the lock bousing. Tbe cylinder lock may also contribute optionally in anchoring the body and holding it in position.

Another important factor in this connection is that the cylinder lock and the fitting assembly, including said body and the outer flanged barrel, can be accommodated within the space provided by the standard size recess normally formed in a door for the purpose intended here.

In the case of an inventive lock fitting assembly, the body connects naturally with the barrel, so that an observer from witbout will obtain the impression that the fitting is a bomogenous lock component, despite the barrel being rotatable relative to the body, in accordance with the invention.

Tbe outwardly located part of the barrel flange will preferably have a frusto-conical shape. This imparts a decorative appearance to the fitting wbile making it difficult to grip the fitting with pliers or some like tool.

In accordance with a preferred embodiment, the end plate of the body, which forms the escutcheon of the fitting, has formed therein a circular recess in wbicb a slotted wasber is rotatably fitted, this wasber forming a separate component.

Such a wasber will render it difficult to drill open the lock, by attacking the plug thereof.

The invention will now be described in more detail with reference to exemplifying embodiments thereof illustrated in the accompanying drawings, in which Figure 1 is a perspective view of an inventive fitting assembly secured to a door; Figure 2 is a cross-sectional view of a door and illustrates the construction of an inventive fitting assembly and the manner in which the assembly is secured with the aid of conventional ancillaries on the otber side of the door; Figure 3 is a perspective view which illustrates the components of an inventive fitting assembly; and Figure 4 is a horizontal sectional view of a door and illustrates an inventive cylinder lock fitting assembly wbicb is secured to the door with the aid of a knob on the other side of the door.

Tbe cylinder lock fitting assembly illustrated in Figures 1-3 and identified generally by the reference numeral 1, is intended to cover and to protect a cylinder lock 5 wbich is mounted on a lock bousing 6 in a door 8. Tbe door 8 is provided with standard recesses 8a, 8b for the lock bousing and cylinder lock respectively. Located on the otber side of the lock housing is a recess 8c for a furtber cylinder lock 12 which bas a fitting 13 of conventional configuration fitted externally thereof.

Tbe inventive fitting assembly 1 bas tbree main parts, namely a body 2 with an escutcbeon or end plate 2a and two parts 2b of circular-segment cross-section, a barrel 3 which comprises a sleeve or sbell 3a and a flange 3b, and a wasber or cover plate 4 wbich is provided with a key slot 4a and which is intended to be accommodated for rotation in a circular recess in the escutcbeon or end plate 2a of the body 2. The recess is referenced 2f.

As shown in Figure 2, the body 2 is accommodated in the outwardly located flanged barrel 3. Tbe barrel flange 3b is provided to tbis end with a circular abutment 3c for seating the escutcheon or end plate 2a.

Projecting from the end plate 2a are two body parts 2b of circular-sector cross-section, the distance between said body parts corresponding to the width or tbickness of the cylinder lock 5.

In the case of the illustrated embodiment, the lock has planar side surfaces and consequently the opposing surfaces 2c of the body parts 2b will also be planar and will be adapted to lie against the lock.

Tbe outer surfaces of the body parts 2b form parts of circular-cylindrical surfaces wbicb have a radius corresponding to the inner radius of the barrel 3 fitted thereon.

The body 2 is secured by two screws 7 which are threaded through the lock bousing and enter screw-tbreaded holes 2e in respective circular-segment sbaped parts 2b.

Wben the screws 7 are tigbtened, the body 2 will be pressed against the door, wherewith the barrel 3 will also be pressed against the door and is beld firmly by frictional engagement of the flange 3b with the door.

If an attempt is made to break the fitting or its attacbment witbin the door by force and therewith grip the barrel flange 3b with a tool, the barrel will solely rotate on the body 2 without any undue force being applied to the anchoring screws 7. Consequently, an attack of this nature will be quite ineffective.

In the case of the alternative embodiment illustrated in Figure 4, the cylinder lock fitting 1 bas the same configuration as the fitting described above with reference to Figures 1-3. Tbe fitting of tbis embodiment is also secured with the aid of screws 7, altbougb in tbis instance the screws extend from an escutcbeon or like plate 15 belonging to a conventional twist grip or knob 15 on the otber side of the door 8. Tbe cylinder lock 5 of tbis particular embodiment is secured by two screws 17 tbreaded througb the lock housing 6.

In the case of tbis embodiment, the fitting 1 does not lie directly against the door, but against a so-called elongated escutcbeon 19 mounted on the outside of the door. A knob plate 20 is fitted to the inside of the door.

Tbe aforesaid two parts 2b of the body 2 are given a shape which corresponds to the configuration of the cylinder lock used in different cases. For example, if a circular-cylindrical lock is used, the two body parts 2b will consist of a single coherent part which presents a circular recess for accommodation of the lock.

An oval shaped cylinder lock can also be embraced by a single, continuous part having a correspondingly shaped recess or aperture.

The lengtb of the part or parts 2b can vary. In certain instances it may be judicious for the body parts 2b to extend rigbt up to the lock housing, i.e. have substantially the same lengtb as the housing.

However, the part or parts 2b are preferably slightly sborter tban the lock bousing. Tbis affords greater flexibility when fitting the lock, not least since door thicknesses vary. It is tberefore possible to use a fitting of standard dimensions with doors wbicb vary greatly in widtb.

Although not shown, the body 2 can be secured with the aid of furtber screws threaded through the lock housing.

Claims (9)

1. A fitting assembly for a cylinder lock of the kind wbicb is mounted on a lock bousing (6) in, for instance, a door (8) and wbicb protrudes from said door, and wbicb fitting (1) includes a body (2) that has an end plate (2a), preferably a circular end plate which partially covers from the outside the part of the cylinder lock protruding tbrougb a recess (8b) in the door and enables a key to be inserted in a key slot in the plug (5a) of the lock, by virtue of an opening (liy) in the fitting (1), and wbicb body (2) bas inner parts (2b) wbicb are adapted to the outer profile of the lock and extend therealong, and which body (2) is secured to the door, eitber directly or indirectly, by means of screws (7) passing through the lock bousing (6), and wbicb fitting (1) furtber includes a barrel (3) which embraces the body (2) at least partially and which is held pressed by said body in a direction towards the door (8) and will rotate relative to said body if manipulated by a tool, cbaracterized in that the barrel (3) has formed integrally therewith a flange (3b) which includes an annular abutment (3c) for accommodating the end plate (2a) of the body (2); and in that a part (3a) of the barrel (3) enters the recess (8b) in the door (8).

2. A fitting according to Claim 1, characterized in that said part (3a) of the barrel extends substantially as far into the recess (8b) as the body (2).

3. A fitting according to Claim 1 or Claim 2, cbaracterized in that the outwardly located parts of the body parts (2b) wbicb extend along the outer profile of the cylinder lock bousing (5) present parts of circular-cylindrical surfaces (2d) having a radius which corresponds to the inner radius of the barrel part (3a) entering the door recess (8b).

4. A fitting according to Claim 3, characterized in that said body parts (2b) wbicb extend along said bousing bave a circular-sector cross-section.

5. A fitting according to any of Claims 1-4, characterized in that the outer part of the barrel flange (3b) bas a frusto-conical sbape.

6. A fitting according to any of Claims 1-5, characterized in that the end plate (2a) of the body (2) bas a circular recess (2f) for rotatably accommodating a slotted washer or plate, wbicb is a separate part.

7. A fitting for a cylinder lock, substantially as hereinbefore described with reference to, and as shown in, Figures 1 to 3 of the accompanying drawings.

8. A fitting for a cylinder lock, substantially as hereinbefore described with reference to, and as shown in, Figure 4 of the accompanying drawings.

9. Any novel feature or combination of features described herein.