GB2473662A

GB2473662A - Method and apparatus for inhibiting tampering with a lock

Info

Publication number: GB2473662A
Application number: GB0916541A
Authority: GB
Inventors: Peter Golik
Original assignee: AVANCO HARDWARE Ltd
Current assignee: AVANCO HARDWARE Ltd
Priority date: 2009-09-21
Filing date: 2009-09-21
Publication date: 2011-03-23
Also published as: GB0916541D0

Abstract

A method and apparatus for inhibiting tampering with a lock provides a means for inhibiting the removal of at least a part of a cylinder body 14 of a lock from a lock casing 22. The cylinder body 14 has a longitudinal axis A which extends in a direction which is substantially parallel to the direction of insertion of a key into the cylinder body 14. The method includes providing a guard 40 which extends around at least a part of the cylinder body 14, and providing an abutment member 36 connected to one only of the cylinder body 14 and the guard 40 such that movement of at least a part of the cylinder body 14 in a direction which is substantially parallel to the longitudinal axis A of the cylinder body 14 is inhibited by the abutment member by abutting an abutment surface 52a of the other one of the cylinder body 14 and the guard 40.

Description

Title: Method and apparatus for inhibiting tampering with a lock

Description of Invention

This invention relates to a method and apparatus for inhibiting tampering with a lock, in particular inhibiting tampering with cylinder locks.

"Cylinder" locks are known in the art Cylinder locks include a cylinder body which holds a rotatable plug. The cylinder body includes an upper part which has a substantially circular cross-section, and a lower part which extends generally radially outwardly from the upper part. The rotatable plug is moveable through 360° relative to the cylinder body by means of insertion of a key into the plug. When the plug is in the locked position, the plug is held in a substantially stationary, non-rotatable position relative to the upper part of the cylinder body by a series of movable tumblers which extend along a longitudinal axis of the cylinder body. The longitudinal axis of the cylinder body is substantially parallel with a direction of insertion of a key into the plug.

Insertion of a compatible key into the plug causes the tumblers to move into the correct configuration relative to the plug, to enable the plug to be rotated relative to the cylinder body.

The plug is connected to a cam which is rotatable with the plug about the longitudinal axis of the cylinder body. The cam includes a first part which has a substantially circular cross-section and which is coaxial with the plug, and an actuating projection which extends generally radially outwardly of the first part.

The cylinder body includes an opening in which the cam is positioned, the opening extending through the upper part of the cylinder body, and extending partially through the lower part of the cylinder body, so as to enable the cam to rotate relative to the body without the projection member impinging on the cylinder body.

The cylinder body is receivable in a lock casing, which in turn is receivable in a profile, such as a door. The cylinder body extends through an opening in the lock casing, and, in use, is positioned relative to the lock casing such that rotation of the plug causes rotation of the cam, such that movement of the actuating projection causes actuation of other mechanisms within the lock casing, for example latches and deadbolts.

The cylinder is held in position relative to the lock casing by a fixing, usually a screw, which extends through the lower part of the body, in a lateral direction which is substantially perpendicular to the longitudinal axis of the cylinder body. The cylinder body includes an aperture for receiving the fixing, usually directly beneath the opening for the cam, such that the fixing can extend through both the casing and the cylinder body. A particular type of known cylinder lock is a "Eurocylinder" or "Eurolock", A disadvantage of this type of lock is that the proximity of the opening for the cam and the aperture for receiving the fixing for attaching the cylinder body to the lock casing means that the cylinder body is significantly weakened in this area Tampering with the cylinder, by applying even a small torque, for example by means of a small hand tool, such as pliers, about the fixing which extends through the cylinder and the lock casing, can be sufficient to break the cylinder body in two in or near to this weakened area. Such a torque could be applied, for example in a direction which causes the cylinder body to "pitch", i.e. to pivot about the fixing, or in a direction which causes the cylinder to "roll", i.e. to rotate generally about a second longitudinal axis which is substantially parallel to the first longitudinal axis of the cylinder body. Once the cylinder body has been broken, it is simple to remove at least a part of the cylinder body from the casing, and hence from the profile. This permits access to the lock casing mechanisms, which can enable the latches and deadbolts, etc. to be moved to unlocked positions, enabling the profile, e.g. the door in which the lock casing is fitted, to be unlocked, and opened.

Even if a substantially linear force is applied to the cylinder body, for example by pulling the cylinder body in a direction which is substantially parallel to the longitudinal axis, the force can be sufficient to cause the cylinder to break.

An object of this invention is to overcome the above disadvantage.

According to a first aspect of the invention, there is provided a method of inhibiting tampering with a lock, including inhibiting the removal of at least a part of a cylinder body of a lock from a lock casing, the cylinder body having a longitudinal axis which extends in a direction which is substantially parallel to the direction of insertion of a key into the cylinder body, the method including providing a guard which extends around at least a part of the cylinder body, and providing an abutment member connected to one only of the cylinder body and the guard, such that movement of at least a part of the cylinder body in a direction which is substantially parallel to the longitudinal axis of the cylinder body is inhibited by the abutment member abutting an abutment surface of the other one of the cylinder body and the guard.

The guard strengthens the cylinder body against breakage. In the event that a force applied to the cylinder body is so great that it is possible to overcome the support of the guard and break the cylinder, the removal of at least a part of the cylinder body from the lock. casing is inhibited by engagement of the abutment surface against the abutment surface. Inhibiting removal of the cylinder body from the lock casing means that it is not possible for the inner mechanisms of the lock casing to be accessed by someone tampering with the lock from an external side of the lock casing (i.e. whilst the door is closed).

The method may include providing a two part guard, a first part for extending around the cylinder on a first side of the lock casing, and a second part for extending around the cylinder body on a second side of the lock casing, each part of the guard having an opening for receiving the cylinder body! and first and second fixing points for connecting the two parts of the guard together! the methoct including the steps of inserting a lock casing into a profile! and inserting the cylinder into the lock casing, , placing the first part of the guard around the cylinder body, on an outer side of the lock casing! placing the second part of the guard around the cylinder body on the opposite, rear side of the lock casing from the first part of the guard! and connecting the two parts of the guard together via the first and second fixing points.

The two parts of the guard may be connected together in a first position which, in use, is beneath the cylinder body, and in a second position which! in use, is above the cylinder body.

The method may include a step of connecting a cylinder body to the lock casing which precedes a step of placing the two parts of the guard around the cylinder body.

This provides the advantage that movement of the guard parts relative to the lock casing is inhibited or prevented. Connecting the two parts of the guard together at two positions reduces the chance of the two guard parts pulling apart in the event of a torque being applied to the cylinder body. Therefore the likelihood of the cylinder breaking is reduced. The abutment member provides a failsafe, such that in the event of a sufficient force being applied to break the cylinder body, removal of at least a part of the cylinder body from the lock casing is inhibited.

The method may include positioning the two parts of the guard such that each part of the guard abuts the lock casing. r

The method may include positioning the two parts of the guard such that they abut one another when connected together.

According to a second aspect of the invention, there is provided an anti-tamper apparatus for a cylinder lock having a cylinder body which has a longitudinal axis which extends in a direction which is substantially parallel to a direction of insertion of a key into the cylinder body, the apparatus including a guard for extending around at least a part of the cylinder body to inhibit deformation of the cylinder body, and an abutment member connectable to one only of the cylinder body and the guard, the other of the cylinder and the guard including an abutment surface such that abutment of the abutment member against the abutment surface inhibits movement of at least a part of the cylinder body relative to the guard in a direction substantially parallel to the longitudinal axis of the cylinder body.

The abutment member may be attached to the cylinder body, and preferably extends through the cylinder body. The advantage of attaching the abutment member to the cylinder body is that the cylinder body can be inserted through the lock casing, and hence the profile, before fitting the guard. Attaching a part of the guard to the cylinder body prior to insertion of the cylinder body into the lock casing and hence the profile is less advantageous because it is necessary to position the guard part sufficiently accurately that the cam member of the cylinder lock (as described above) aligns with the lock casing, and the guard part abuts the lock casing as closely as possible. Achieving this positional accuracy is awkward and time consuming, and may require the use of a jig, to ensure that the guard part is positioned correctly before installation of the cylinder body into the lock casing. Once the cylinder body is in place, the majority of the guard is preferably obscured by the profile. Therefore it is not possible to insert a fixing through the guard and the cylinder body, so as to connect the guard to the cylinder body, after the cylinder body has been correctly located hi the lock casing. The profile would prevent this method of assembly.

The abutment member may be receivable in a recess in the guard, an Inner surFace of the recess providing the abutment surFace. The recess enables the guard to abut the lock casing without impinging upon the abutment member.

The recess may be larger than the abutment member In a longitudinal direction, so as to pemift a smell amount of movement of the cylinder body relative to the guard in a direction which is substantially parallel to the longitudinal aS of the cylinder body. This is so as to permit some adjustment In the position of the cylinder body relative to the lock casing and the guard.

The guard may be provided in two parts, a first part for extending around the clnderonafirstsideofthelockcaeing,andasecondparte,jjng around the cylinder body on a second, opposite side of the lock casing.

In use, each part of the guard preferably abuts the lock casing.

in use, the two parts of the guard may abut one another.

According to a third aspect of the invention, them Is provided an anti-tamper lock, Including a cylinder body, a lock casing, and an anti-tamper apparatus according to the second aspect of the invention.

According to a fourth aspect of the invention, there is provided a door including an and-tamper lock according to the third aspect of the invention.

The Invention will now be described, by way of example only, with reference to the accompanying drawings, of which: FIGURE 1 is an illustrative view of a cylinder lock, known as a REurocyIinderfl lock; FIGURE 2A is a front perspective view of a first part of two-part guard for a cylinder lock; FIGURE 2B is a rear perspective view of a first part of two-part guard for a cylinder lock; FIGURE 2C is a front perspective view of a second part of a two part guard.

FIGURE 20 is a rear perspective view of a second part of a two part guard.

FIGURE 3 shows an exploded perspective view of an anti-tamper apparatus for a cylinder lock, in accordance with the invention, including a guard as shown in FIGURES 2A to 2D; FIGURE 4 is an illustrative perspective view of the anti-tamper apparatus of FIGURE 3 fitted to a cylinder lock; FIGURE 5A is an illustrative perspective view of a cylinder lock.nd a lock casing fitted to a door profile only part of which is shown; FIGURE SB shows a first guard part fitted to the cylinder lock and lock casing combination, the profile of FIGURE 5A is removed so as not to obscure the guard part; FIGURE SC is an illustrative perspective view, viewed from the same perspective as FIGURE 5A, showing a second guard part in position relative to the cylinder lock and the lock casing, the profile is not shown; FIGURE SD is an illustrative perspective view, from the same perspective as FIGURE S. showing the two guard parts connected together; the profile is not shown.

S FIGURE 6A is an illustrative view of an axis of rotation of a torque causing the cylinder body to "pitch", and FIGURE 5 is an illustrative view of an axis of rotation of a torque causing the cylinder body to roll".

Referring to the drawings, there is shown a anti-tamper apparatus 10 for a cylinder lock 12. The cylinder lock 12 is of known type, and includes a cylinder body 14 including an upper part 14a which has a substantially circular cross-section, and a lower part 14b which extends generally radially outwardly from the upper part 14a. The upper part 14a of the cylinder body 14 houses a rotatable plug 16. The rotatable plug 16 is moveable through 360" relative to the cylinder body 14 by means of insertion of a key into the plug 16. When the plug 16 is in the locked position, the plug 16 is held in a substantially stationary, non-rotatable position relative to the upper part 14a of the cylinder body 14 by a series of movable tumblers which extend along a longitudinal axis A of the cylinder body 14. The longitudinal axis A of the cylinder body 14 is substantially parallel with a direction of insertion of a key into the plug 16.

Insertion of a compatible key into the plug 16 causes the tumblers to move into the correct configuration relative to the plug 16, to enable the plug 16 to be rotated relative to the cylinder body 14.

The plug 16 is connected to a cam 18 which is rotatable with the plug 16 about the longitudinal axis A. The cam 18 includes a first part iSa which has a substantially circular cross-section and which is coaxial with the plug 16, and an actuating projection 18b which extends generally radially outwardly of the first part 18a. The cylinder body 14 includes an opening 20 in which the cam 18 is positioned. The opening 20 extends through the upper part 14a of the cylinder body 14, and partially through the lower part 14b of the cylinder body 14, so as to enable the cam 18 to rotate relative to the cylinder body 14 without the projection member 18b impinging on the lower part 14b of the cyfinder body 14.

The cylinder body 14 is receivable in a lock casing 22, which in turn is receivable in a profile such as a door, a part of which is shown at 24. The cylinder body 14 extends through an opening 26 in the lock casing 22, and, in use, is positioned relative to the lock casing 22 such that rotation of the plug 16 causes rotation of the cam 18, such that movement of the actuating projection 18b causes actuation of other mechanisms within the lock casing 22, for example a deadlock bar which in turn restricts movement of latches 28 and deadbolts 30.

The cylinder body 14 is held in position relative to the lock casing 22 by a fixing 32, in this example a screw, which extends through the lower part 14b of the cylinder body 14, in a lateral direction which is substantially perpendicular to the longitudinal axis A of the cylinder body 14 and the direction of insertion of the key. The cylinder body 14 includes an aperture 34 for receiving the fixing 32, directly beneath the opening 20 for the cam 18, such that the fixing 32 can extend through the lock casing 22 and the cylinder body 14. Such a cylinder lock 12 is known in the art as a "Eurocylinder" or "Eurolock".

26 The cylinder body 14 also includes an abutment member 36 which extends outwardly of the lower part I 4b of the cylinder body 14 in a lateral direction, i.e. in a direction which is substantially perpendicular to the longitudinal axis of the cylinder body 14. In this example, the abutment member 36 is a pin which extends through the lower part 14b of the cylinder body 14. The abutment member 36 is near to, but spaced in a longitudinal direction, from the opening for the cam 18.

The abutment member 36 is preferably manufactured from a high-strength material such as steel. In this example, the pin forming the abutment member 36 is inserted into an opening which extends through the lower part 14b of the cylinder body 14. The abutment member 36 is engaged with the cylinder body 14 by means of an interference fit. The abutment member 36 extends outwardly of the cylinder body 14 by approximately 3mm on each lateral side of the cylinder body 14.

The anti-tamper apparatus 10 includes a guard 40 for extending around and supporting the cylinder body 14, so as to strengthen the cylinder body 14, particularly in the region of the opening 20. The guard 40 includes a first part 40a, and a second part 40b, Each guard part 40a, 40b is substantialTy oval in cross-section and has an inner face 41 which, in use, abuts the lock casing 22, and an outer face 42. In this example, each guard part 40a, 40b s a zinc casting, although it will be appreciated that each guard part may be manufactured using any other suitable method, and from any other suitable material.

Each guard part 40a, 40b includes an opening 43 for receiving the cylinder body 14. Each opening 43 extends from the inner face 41 to the outer face 42 of the respective guard part. Each guard part 40a, 40b also includes a pair of fixing formations 44a, 44b for receMng a fixing 46a, 46b, for example a bolt, for connecting the two parts 40a, 40b of the guard 40 together. A first fixing formation 44a is positioned at or near a lower end of each guard part 40a, 40b, and a second fixing formation 44b is positioned at or near an upper end of each guard part 40a, 40b.

Each fixing formation 44a, 44b of the second guard part 40b includes a respective guide element 45a, 48b which extends from the inner face 41 of the guard part 40b and assists in aligning the respective fixing 46a, 4Gb with the fixing formations 44a, 44b of both guard parts 40a, 40b. The lock casing 22 includes an opening 50 for receiving the guide element 48b of the upper fixing formations 44b. Thus, the fixing 46b which connects the upper ends of the guard parts 40a, 40b extends through the lock casing 22.

The guide element 48a associated with the tower fixing formations 44a extends, in use, beneath the lock casing 22, such that at least a part of each guard part 40a, 40b abuts a part of the other guard part 40a, 40b, This increases the strength and rigidity of the guard 40.

The first guard pad 40a includes a recess 52 which extends from the inner face 41 of the guard part towards the outer face of the guard part 40a, but does not extend completely through the guard part 40a. The recess 52 extends laterally on each side of the opening 43, and is substantially square in cross section, although it will be appreciated that the recess 52 may be any shape as desired. The abutment member 36 is receivable in the recess 52.

The recess 52 has.an inner rear surface 52a which provides an abutment surface against which the abutment member 36 is permitted to abut, so as to inhibit movement of the cylinder body 14 relative to the guard part 40a in a direction which is substantially parallel to the longitudinal axis of the cylinder body, as will be described in more detail below.

The anti-tamper apparatus 10 is fitted as follows, and as shown in figures 5A -SD.

The lock casing 22 is inserted into the profile 24, in this example a door. The cylinder body 14 is inserted into the lock casing 22 and hence into the profile 24, through the opening 26. The cylinder body 14 is inserted into the lock casing 22 such that the abutment member 36 is positioned on a first side of the lock casing 22, The first side of the lock casing 22 is that which is positioned on what will be the external side of the profile 24. The cam opening and the cam 18 are aligned with the lock casing 22. The fixing 32 is inserted into the aperture 34, so as to fix the cylinder body 14 in position relative to the lock casing 22 and the profile 24.

The first guard part 40a is fitted to the cylinder body 14, by inserting the cylinder body 14 through the opening 43, and sliding the first guard part 40a along the cylinder body 14 until the first guard part 40a abuts the first, external side of the lock casing 22. The abutment member 36 sits inside the recess 52, ID so that the guard part 40a is permitted to abut the look casing 22 along the full length of the guard part 40a.

The second guard part 4Db is fitted to the cylinder body 14, by inserting the cylinder body 14 through the opening 43 of the second guard part 4Db, and sliding the second guard part 4Db along the cylinder body 14 until the second guard part 4Gb abuts a second, opposite, i.e. internal side of the lock casing 22. The upper guide element 48b of the second guard part 4Gb is inserted into the opening 50 from the second side of the lock casing 22. The lower guide element 48a extends beneath the lock casing, towards the first guard part 40a.

The guard parts 40a, 4Db may be attached to the cylinder body 14 in any order.

The guard parts 40a, 4Db are connected together by two fixings 46a, 46b each of which extends through a respective fixing formation 44a, 44b. The guard 40 is thus securely fixed to the cylinder and the lock casing 22. Owing to the fact that both parts 4Da, 4Db are able to abut the lock casing 22, the guard 40 supports the cylinder body 14 against moments applied to the cylinder body 14. The cylinder body 14 is thus strengthened by the guard 40. The fact that both parts 4Da, 4Db of the guard 4D abut the lock casing 22 means that torque which is hence transferred from the cylinder body 14 to the guard 40 and the lock casing 22 such that the cylinder body 14 is unlikely to "pitch" or "roll". The second, upper fixing 46b inhibits the two parts 40a, 4Db guard from separating from one another, and from being deformed as a result of a torque being applied thereto. Thus the second fixing 4Gb makes the guard 40 stronger and more reliable than a guard 40 having only one fixing. However, the second fixing 4Gb (and the corresponding opening 50 in the lock casing 22) could be omitted if desired, Another advantage of this arrangement is that the guard 40 extends beneath the lock casing, such the guard parts 40a, 40b abut one another. This also increases the strength and rigidity of the guard 40, and inhibits pitching and rolling of the guard 40, and inhibits separation of the guard parts 40a, 4Db from one another, particularly in an upper region, as a torque which would usually cause the guard parts 40a, 4Db to separate in an upper region would be inhibited from acting. The fact that the lower regions of the guard parts 40a, 4Db abut one another means that the lower regions of the guard parts 40a, 4Db cannot move closer together, and hence that a torque applied cannot move the upper regions further apart. It will be appreciated that if the second fixing 46b is omitted from the guard 40, it is advantageous for the size of the abutting regions of the guard parts 40a, 4Db to be increased, so as to increase the rigidity of the guard 40.

Handles (not shown) are fitted to the cylinder body 14, in the usual manner, the guard parts 40a, 4Db fitting inside and being obscured from view by conventional handles.

In use, the guard 40 acts to inhibit breakage of the cylinder body 14.

Additionally, in the event that the cylinder body 14 does break, the abutment member 36 inhibits movement of at least a part of the cylinder body 14 relative to the guard 40, and hence to the lock casing 22, in a direction which is parallel to the longitudinal axis A of the cylinder body 14.

In a first situation, a person attempts to tamper with the lock by applying a torque which would ordinarily cause the cylinder body 14 to "pitch", see figure GA. The guard 40 supports and strengthens the cylinder body 14, particularly in the region of the cam 18 and the opening 20. Thus the cylinder body 14 is inhibited from breaking. The fact that both parts 40a, 40b of the guard abut the lock casing 22 means that the cylinder body 14 is protected by transferring at least some of the torque away from the cylinder body 14 to the guard 40 and the lock casing 22.

In a second situation, a person attempts to tamper with the lock by applying a torque about an axis of rotation B parallel to the longitudinal axis A of the cylinder body 14, i.e. in a direction which would ordinarily cause the cylinder body to "roll", see figure 6B. Again, the guard 40 strengthens and supports the cylinder body 14, particularly in the region of the cam 18 and the opening 20.

In a third situation, a person attempts to tamper with the lock by applying a substantially linear force in a direction generally parallel to the longitudinal axis A of the cylinder body 14. Again, the guard 40 inhibits breakage of the cylinder body 14 by protecting the cylinder body 14 in the region of the cam 20 and the opening 20. The second guard part 40b abuts against the second side of the lock casing 22 and transfers at least some of the force applied to the cylinder body 14 away from the cylinder body to the combination of the guard 40 and the lock casing 22.

The abutment member 36 provides a failsafe, in that in the unlikely event of a torque being applied which is sufficient to overcome the guard 40 and to break the cylinder body 14, removal of at least a part of the cylinder body 14 from the guard 40 and hence the lock casing 22, is inhibited.

An advantage of the anti-tamper apparatus 10 is that the fixing 32 which connects the cylinder body 14 to the lock casing 22 is permitted to flex slightly before the abutment member 36 comes to rest against the abutment surface 52a. This means that some of the force applied can be absorbed by other parts of the lock, for example the lock casing 32. Also a small amount of deformation of the cylinder body 14 is permitted, the deformation being insufficient to break the cylinder body 14.

Simply fixing the guard 40 directly to the cylinder body 14, for example with a screw, would not inhibit breakage of the cylinder body 14 to the same extent as the present invention.

Considering the example of a person attempting to remove at least a part of the cylinder body 14 from the lock casing 22, by pulling the part of the broken cylinder body 14 which is closest to the first external side of the lock casing 22, outwardly of the lock casing 22, in a direction away from the second side of the lock casing 22. The abutment member 36 abuts the abutment surface 52a of the recess 52. Movement of the cylinder body 14 in a direction towards the first external side of the lock casing 22 and substantially parallel to the longitudinal axis A of the cylinder body 14 is thus inhibited.

If a person attempts to remove the cylinder body 14 by pushing the cylinder body inwardly relative to the lock casing, i.e. towards the second side of the lock casing 22, the abutment member 36 abuts the first side of the lock casing and thus movement of the cylinder body 14 in a direction towards the second side of the lock casing and substantially parallel to the longitudinal axis A of the cylinder body 14, is thus inhibited.

The anti-tamper apparatus 10 can be retro fitted to existing locks. It is necessary to modify the existing cylinder body, by adding the abutment member 36, and the guard 40, but it would not be necessary to replace the cylinder body 14 completely, thus avoiding the need to replace keys, etc. In alternative embodiments of the inventions, the abutment member 36 may be cast or machined as part of the cylinder body 14, rather than being added as an additional manufacturing step. Alternatively, the abutment member 36 could be a split pin, rather than a solid pin. The abutment member 36 could be engaged with the cylinder body 14 by means of a push fit, rather than an interference fit.

The abutment member 36 could alternatively be connected to at least one of the guard parts 40a, 40b, rather than to the cylinder body 14. A groove or recess would be provided in at least one of the sides of the lower part 14b of the cylinder body 14 to receive the abutment member 36. This arrangement is less advantageous than the embodiment described above, because fitting the guard to the cylinder is more awkward.

When used in this specification and claims, the terms "comprises" and "comprising" and variations thereof mean that the specified features, steps or integers are included. The terms are not to be interpreted to exclude the presence of other features, steps or components.

The features disclosed in the foregoing description, or the following claims, or the accompanying drawings, expressed in their specific forms or in terms of a means for performing the disclosed function, or a method or process for attaining the disclosed result, as appropriate, may, separately, or in any combination of such features, be utilised for realising the invention in diverse forms thereof,

Claims

CLAIMS1. A method of inhibiting tampering with a lock, including inhibiting the removal of at least a part of a cylinder body of a lock from a lock casing, the cylinder body having a longitudinal axis which extends in a direction which is substantially parallel to the direction of insertion of a key into the cylinder body, the method including providing a guard which extends around at least a part of the cylinder body, and providing an abutment member connected to one only of the cylinder body and the guard, such that movement of at least a part of the cylinder body in a direction which is substantially parallel to the longitudinal axis of the cylinder body is inhibited by the abutment member abutting an abutment surface of the other one of the cylinder body and the guard.
2. A method according to claim 1 including providing a two part guard, a first part for extending around the cylinder body on a first side of the lock casing, and a second part for extending around the cylinder body on a second side of the lock casing, each part of the guard having an opening for receiving the cylinder body, and first and second fixing points for connecting the two parts of the guard together, the method including the steps of inserting a lock casing into a profile, inserting the cylinder into the lock casing, and, placing the first pad of the guard around the cylinder body, on an outer side of the lock casing, placing the second part of the guard around the cylinder body on the opposite, rear side of the lock casing from the first part of the guard, and connecting the two parts of the guard together via the first and second fixing points.
3. A method according to claim 2 wherein the two parts of the guard are connected together in a first position which, in use, is beneath the cylinder body, and in a second position which, in use, is above the cylinder body.
4. A method according to claim 2 or claim 3 wherein a step of connecting cylinder body to the lock casing precedes a step of placing the two parts of the guard around the cylinder body.
5. A method according to any one of claims 2 to 4 including positioning the two parts of the guard such that each part of the guard abuts the lock casing.
6. A method according to any one of claims 2 to 5 including positioning the two parts of the guard such that they abut one another when connected together.
7. A method of inhibiting tampering with a lock substantially as described herein and/or as shown in the accompanying drawings.
8. An anti-tamper apparatus for a cylinder lock having a cylinder body which has a longitudinal axis which extends in a direction which is substantially parallel to a direction of insertion of a key into the cylinder body, the apparatus including a guard for extending around at. least a part of the cylinder body to inhibit deformation of the cylinder body, and an abutment member connectable to one only of the cylinder body and the guard, the other of the cylinder and the guard including an abutment surface such that abutment of the abutment member against the abutment surface inhibits movement of at least a part of the cylinder body relative to the guard in a direction substantially parallel to the longitudinal axis of the cylinder body.
9.. An anti-tamper apparatus according to claim 8 wherein the abutment member is attached to the cylinder body.
10. An anti-tamper apparatus according to claim 9 wherein the abutment member extends through the cylinder body.
11. An anti-tamper apparatus according to claim U or claim 10 wherein the abutment member is receivable in a recess in the guard, an inner surface of the recess providing the abutment surface.
12. An anti-tamper apparatus according to claim 11 wherein the recess is larger than the abutment member in a longitudinal direction, so as to permit a small amount of movement of the cylinder body relative to the guard in a direction which is substantially parallel to the longitudinal axis of the cylinder body.
13. An anti-tamper apparatus according to any one of claims 8 to 12 wherein the guard is provided in two parts, a first part for extending around the cylinder on a first side of the lock casing, and a second part for extending around the cylinder body on a second, opposite side of the lock casing.
14. An anti-tamper apparatus according to claim 13 wherein, in use, each part of the guard abuts the lock casing.
15. An anti-tamper apparatus according to claim 12 or claim 13 wherein, in use, the two parts of the guard abut one another.
16. An anti-tamper apparatus substantially as described herein and/or as shown in the accompanying drawings.
17. An anti-tamper lock, including a cylinder body, a lock casing and anti-tamper apparatus according to any one of claims 7 to 14.
18. An anti-tamper lock substantially as described herein and/or as shown in the accompanying drawings.
19. A door including an anti-tamper lock according to claim 15.
20. Any novel feature or navel combination of features substantially as described herein and/or as shown in the accompanying drawings.