AU2015203068B2 - Security alert device - Google Patents

Abstract

A switch box (502) for installation in or on a structure in which an article moves between a locked position and an unlocked position, the switch box (502) including switch means (522) housed within the switch box (502); actuator means (524) associated with the 5 switch means (522); the actuator means (524) adapted for movement between a first position and a second position to indicate a locked position and an unlocked position of the article; wherein the location of the actuator means (524) is adjustable without dismantling the switch box (502). Sbo 508 s 2o so6 512? 5045b 50Y. 551s4 5lo

Description

EDITORAL NOTE 2015203068 There is no page 1. Description pages start on page 2.

SECURITY ALERT DEVICE Field of the Invention This invention relates to security alert devices and more particularly relates to security modules that can provide an alert on the status of an object that provides entry 5 into a secure area, for example a door or window. In particular it can indicate whether, for example, a door is in an open or closed position and whether a lock associated with the door is in a locked position or an unlocked position. This invention also relates to security device in which the location of an actuator and/or a switch within the device can be adjusted. 10 Background to the Invention Devices used to alert a user or personnel of a security firm, for example, of entry through a door or window have existed for some time. Other arrangements are used to detect the opening and closing of a door, through its locking system. These use switch boxes or micro-switch boxes that have a micro 15 switch activated, for example through an actuator, such as a plunger or lever, coming into contact with a bolt or latch of a lock that is positioned in a door, Movement of the plunger or lever triggers the micro-switch to send a signal or alarm to a remote station. The position of the micro-switch lever or plunger has to be set correctly so that it interacts or makes contact with the bolt of the door lock. This has to be done for each 20 different application of the micro-switch box as the tolerance for the alarm contacts is tight or stringent. In this case, the micro-switch box has to be dismantled to adjust and re-adjust the micro-switch and/or the plunger, or to remove a tamper alert device. The present invention seeks to ameliorate one or more of the above disadvantages by providing access to an actuator for adjustment of the actuator and/or switch without 25 having to pull apart or dismantle the entire switch box. 2 The above references to and descriptions of prior proposals or products are not intended to be, and are not to be construed as, statements or admissions of common general knowledge in the art. In this specification, including the claims, the directional terms "top", "bottom", 5 "side", "rear", "front", "upper", "lower" and the like will be used in the sense that these terms would have with reference to a switch box of the present invention as shown in the accompanying Figures. Summary of the Invention According to an aspect of the invention, there is provided a switch box for 10 installation in or on a structure in which an article moves between a locked position and an unlocked position, the switch box including: switch means housed within the switch box; actuator means associated with the switch means; said actuator means adapted for movement between a first position and a second position to indicate a locked position 15 and an unlocked position of the article; wherein the location of the actuator means is adjustable without dismantling the switch box. The switch box preferably includes a second compartment for housing said switch means and adjustment means connected to said second compartment for adjusting the 20 position of the actuator means. The switch box may further include a locking plate adapted to move between a first position in which the locking plate prevents access to said adjustment means and a second position that allows access to said adjustment means. 3 The switch box may be such that in order to move said locking plate to the second position, a tamper device or a part of a tamper device is required to be removed thereby activating an alarm. The locking plate may have a recess at one end for securing and preventing 5 movement of the adjustment means in the first position and a tail at a second end that protrudes into a space occupied by said tamper device or said part of a tamper device in said second position. The switch box may further include a first compartment for housing the tamper device and an end-of-line module. 10 The first compartment may be engaged with the second compartment through a first side of the first compartment and a first side of the second compartment. The first side of the second compartment can be slidable with respect to the first side of the first compartment through a tongue and groove arrangement. The adjustment means is preferably a fastening means and is connected to the 15 second compartment adjacent said first side of said second compartment. According to a further embodiment of the present invention, there is provided a switch box unit having the switch box according to the first aspect and a face plate attachable to said structure. A set-up plate may be used prior to attaching said face plate in order to enable adjustment of the adjustment means. 20 According to yet a further embodiment of the invention, theer is provided a method of installing a switch box in or on a structure in which an article moves between a locked position and an unlocked position, the method including: housing switch means within the switch box; 4 providing actuator means associated with the switch means; said actuator means adapted for movement between a first position and a second position to indicate a locked position and an unlocked position of the article; adjusting the location of the actuator means without dismantling the switch box. 5 In an embodiment of the invention there is provided a switch box for installation in or on a structure in which an article moves between a closed position and an open position relative to said structure, the switch box including: a front wall, a rear wall, a pair of sides walls, a top wall and bottom wall, said top wall and said bottom wall affixed to each of the front wall, rear wall and the pair of side to walls; a tamper apparatus positioned in the switch box and is able to be tested without dismantling the switch box. Preferably, the tamper apparatus is a tamper link device positioned across one of the walls of the switch box to detect tampering with said switch box, the tamper link is device including a link that is pail of an electrical circuit which is broken when the link is dislodged by said tampering upon which an alarm signal is triggered. In a further embodiment of the invention there is provided a switch box for installation in or on a structure in which an article moves between a locked position and an unlocked position, the switch box including: 20 a front wall, a rear wall, a pair of sides walls, a top wall and a bottom wall; switch means housed within the switch box, a switch actuator associated with the switch means; wherein said switch actuator moves between a first position and a second position to indicate the locked or unlocked position of the article and said switch means is 25 mounted adjacent an internal surface of at least one of said walls. 5 Brief Description of the Drawings Preferred embodiments of the invention will hereinafter be described, by way of example only with reference to the accompanying drawings in which: Figure 1A is a perspective view of a switch box for installation in a structure in 5 order to detect the state or condition of an article that moves between an open and a closed position and detect tampering to the switch box, the structure having a side wall partially cut away in order to show the internal components mounted within the box; Figure IB is a perspective view of an alternative switch box for affixing to a structure in order to detect the state or condition of an article that moves between an open to and a closed position and to detect tampering to the switch box; Figure 1C is a perspective view of a switch box for mounting to a structure together with an additional mounting box which is affixed to an article that moves between an open and closed position with respect to the switch box, the switch box also includes a component to detect tampering to the switch box; Is Figure 1 D is a perspective view of a switch box partially cut away in order to show internal components of the switch box according to a further embodiment of the invention; Figure lE is a part sectional view through the front of the switch box of Figure 1 D and showing an additional outer casing; 20 Figure IF is a diagram showing a tamper link device with a male component and a female component that when fitted together forms or closes an electrical circuit; Figure 1G is a block diagram of an electrical circuit which includes the tamper link device and a tamper switch device; Figure 1H is a perspective view of a switch box, partially cut away to show the 25 internal components, wherein an active tamper ring of a reed switch is mounted in an 6 aperture of a mounting block to detect removal of a reed switch from the aperture and thereby detect tampering with the switch box; Figure 1 J is a perspective view of the switch box shown in Figure 1 H with a reed switch fully assembled within the switch box. 5 Figure 2A is a cross-sectional side view of a switch box for installation in a structure in accordance with an embodiment of the invention, shown together with a cover plate that attaches to the switch box; Figure 2B is a perspective view of the switch box of Fig 2A with the side wall partially cut away; 10 Figure 2C is a further perspective view of the switch box of Fig. 2A showing the exposed switch actuator and tamper switch test points; Figure 2D is a perspective view of alternative shapes of a cover plate used in a region where a lock bolt or latch of an article, such as a lock, strikes a switch actuator associated with the switch box of Figure 2A; 15 Figure 3A is a side view of a portion of a switch box in which a switch is mounted within a bracket which is adjustable so that the position of the switch can be adjusted relative to the front wall of the switch box; Figure 3B is a plan view of the switch box of Figure 3A with one of the side walls removed to show the internal components of the switch box; 20 Figure 3C is a perspective view from above of the switch box of Figure 3B showing a separate facing plate that can be attached to the front wall of the switch box of Figure 3B; Figure 3D is a perspective view from above more clearly showing a bracket that is used to house or mount a switch within the switch box of Figure 3B; 25 Figure 3E is a perspective view from above showing the bracket in Figure 3D. 7 Figure 3F is a perspective view from above of an alternative bracket having an aperture in a web of the bracket; Figure 3G is a perspective view from above of a switch box formed in two parts, being an outer casing and a tray that fits within the casing, the tray containing the 5 components of the switch box; Figure 4A is a view of an alternative switch box with one of the side walls removed to show the internal components of the switch box, wherein an actuator block is used to enable a switch actuator to move between a first and second position to actuate a switch; 10 Figure 4B is a side view showing a plunger associated with the actuator block mounted to a shaft; Figure 4C is a side view of an alternative arrangement of the actuator block and plunger and how the actuator block actuates the micro-switch; Figure 5 is a perspective view from above of a further embodiment of a switch 15 box unit that enables adjustment of an actuator and/or switch means associated with the actuator without dismantling the switch box housing the actuator and switch means; Figures 6A to 6F respectively show a perspective view from above, a front view, a left side view, an underneath view, a rear view and a plan view of a compartment housed within the switch box shown in Figure 5; 20 Figure 7A to 7E respectively show a perspective view from above, a plan view, a front view, a right side view and an underneath view of a further compartment housed within the switch box shown in Figure 5; Figures 8A and 8B are respectively front views of a set-up or setting plate and a face plate adapted to be secured to the front of the switch box shown in Figure 5; 8 Figure 9 is a perspective view from above of a locking plate used to prevent access to adjustment means associated with the switch box of Figure 5; Figures lOA, JOB and 1OC are respectively front, side and underneath views of the switch box forming part of the switch box unit of Figure 5; and 5 Figures 1 ]A to lI D are respectively a plan view, a left side view, a front view and a perspective view form above of a protection cover for an end-of-line unit used and housed in the compartment shown in Figures 6A to 6F. Detailed Description of the Preferred Embodiments With reference to Figure TA there is shown a security module (100) in the form of 10 a switch box (102) attached at a front wall 170 to a mounting bracket or plate (104). The switch box (100) is to be installed in a structure, such as a door jamb or window frame, when an article, such as a door or window, moves between closed and open positions and/or locked and unlocked positions. The mounting plate 104 can also act as the front wall of the switch box. The switch box 100 has rear wall 171, top wall 172, bottom wall 15 173 and side walls 174, 175. Within box (102) there is mounted a switch means (106), which can be any one of a reed switch such as a Chubb triple reed switch, a Magnasphere TM switch or Hall Effect switch. The switch means 106 has one face protruding through the bracket (104) so that the face is flush with the external surface of the mounting plate (104). The plate 104, upon installation, will have a further face plate 20 connected flush against the plate 104. A push button or screw, or similar device, will be in contact with a tamper switch 108 to detect any removal of the face plate and to enable a technician to test the tamper switch 108. The switch means (106) may alternatively be fully enclosed within box (102). A tamper switch (108) is also affixed to the internal surface of plate (104) and also extends partially through the external surface of plate 25 (104). A tamper link device may also be fitted to the switch box 102. Each of the switch 9 means (106) and tamper switch (108) have leads (110, 112) respectively connected to a security module (114) which is otherwise known as an "end of line device" or an "end of line module". The module (114) includes electronic components so that upon detection by the tamper switch (108) of tampering to the module (100) or upon detection of a door 5 closing or opening by the switch means (106), a signal is sent through leads (110, 112) to the module (114) and thereafter an alert signal is sent to a remote location. The signals may be transmitted to the remote location from module (114) using fixed line or wireless communications. Other indications may be given to make a person aware of the changed conditions associated with the unit (100), such as a light or LED being illuminated. 10 The mounting plate (104) will generally sit flush within a frame or a wall or any other edge which is in close proximity to a door or window. A corresponding metal ferromagnetic element is fitted to the door or the area that is to be monitored so that when the element is in close proximity to the switch means or alarm monitor switch (106), particularly in the case of a reed switch or Magnasphere switch, a signal can be sent to 15 indicate the closed state of the door or window. When the element is apart or separated from the switch means (106), then a further signal can be transmitted to indicate that the door or window has been opened. Mounted in the plate (104) is a pair of test points (116) for the tamper switch (108), which can also be accessed through a face plate 105 attached to plate 104 (see 20 Figure IB). A test of the switch 108 can be made at button (117) by pressing it inwardly. Alternatively, a screw can be rotated to test the switch 108, which also protrudes through the face plate 105. Thus a technician does not have to pull the mounting plate (104), face plate 105 and box (102) away from its installation, in order to open the box 102 and thereafter test or repair the tamper switch (108) if found to be faulty. 10 Mounting apertures (118) are provided in the mounting plate (104) to enable fasteners to attach to a face plate and to attach the unit (100) to a frame, wall or floor, with the box (102) being recessed and out of view. The switch means (106) prevents a person prying open or gaining access to a door or window to which the box (102) is 5 attached, using for example a crowbar, without having being detected. Referring to Figure IB there is shown an alternative switch box 100 to that of Figure IA. It includes a breakable link, otherwise known as a tamper link device (121) or in the alternative a tamper link (121) and a tamper switch (119). The advantage of a breakable link over a micro-switch is that it is not a mechanical device that can break down and need replacing 10 or otherwise fail to indicate an alarm. The tamper link (121) is more clearly shown in Figure IF and comprises a male part (123) and a female part (125). The tamper link (121) is essentially part of an electrical circuit shown in Figure iG such that removal of the male part (123) of the tamper link (121) breaks the electrical circuit and thereby enables an alarm or signal to be sent to a remote location to indicate that the box (102) 15 has been tampered with or attempted to be tampered with including removal of a face plate such as plate (104). A pair of contacts (127) extend from the bottom of the female portion (125). When the legs (129, 131) of the male part of (123) of link (121) sit within corresponding connectors (117, 115) of the female portion, these legs (129, 131) are respectively in contact with the contacts (127) to form a closed circuit. Therefore, 20 removal of the male part (123) will disconnect the leg (129) from contact (127) and the leg (131) from contact (125) to thereby break the circuit. The male portion (123) may be attached to the plate (104) to detect removal or attempted removal of the face plate attached to box 102, or detect movement of the inner tray with respect to the outer casing, Thus, removal of the plate (104) or the tray will break or release the male portion 25 (123) from the female portion (125). 11 The switch box 100 can be in the form a "matchbox" whereby top wall 172 and bottom wall 173 are formed on a tray that slides in and out of an outer casing or shell. The outer casing or shell is made up of front wall 104 (and/or plate 105), rear wall 171 and side walls 174, 175. In order to pull apart the matchbox, that is, slide the tray out of 5 the shell, it is necessary to remove the male portion of the tamper link device 121 and a tamper screw (not shown) associated with tamper switch 119 securing the tray to the outer casing. More than one switch 106 can be used to detect entry with a double door or window. The switches, which can be triple reed or Magnasphere, would each be adjacent 10 a respective door/window and positioned on the frame and a corresponding magnet attached to a door or window adapted to be kept in close proximity to the switches to indicate a closed state. Generally, two triple reed switches are used to detect movement of the doors and one tamper switch is used to detect tampering with the switch box. The tamper link device 121 and tamper switch device (119) provide two lines of 15 defence against intrusion and are shown more clearly in Figure lB. They will be described in relation to Figures ID and 1 E. Referring to Figure IC there is shown a further example of a micro switch box (120) having a pair of side walls 133, 135), a front wall (137) and a rear wall (139), a top wall (141) and a bottom wall (142). Within the switch box (120) there is a switch (122) 20 (either reed or magnasphere), a tamper switch (124) and an end of line module (126). Each of the switch (122) and the tamper switch (124) are connected through leads to the alarm monitor switch which is the end of line module (126). The switch box (120) also includes an access point (128), which can be a screw (similar to (150), for the tamper switch (124) to enable tests or routine monitoring of the tamper switch by a technician. 25 The tamper switch and the screw can be regarded as tamper apparatus. In this manner 12 the switch box (120) does not need to be opened or pulled apart in order to have access to the tamper switch (124). The switch box (120) can be mounted to one part of a structure, such as a door jamb or window frame, which is adjacent an article, such as a door or window, which is 5 typically moved between a closed and open position. An additional mounting box (130) will be in close proximity to the switch box (120) when the article is in a closed position and magnetic means (132) located on the box (130) is in close proximity to the switch (122). The switch box 120 can therefore be mounted to a frame of a door or a window or 10 even on a surface such as a wall or the ground. Corresponding mounting box 130 can be affixed to an article that moves between an open and closed position, such as a window or a door. In this manner opening or closing of the article can be detected through the switch 122 with the signal being sent to the end of line module 126. In addition, tampering to the switch box (120) can be detected by the tamper switch (124), or 15 alternatively a tamper link device, and a signal sent to the end of line module (126). Referring to Figure ID there is shown a switch box 144 similar to box 120 shown in Figure IC. It includes a switch means 106, a security or end-of-line module 114, a tamper link 121 and a tamper switch I19, in the form of a micro-switch. The tamper switch 119 is optional and can be mounted adjacent an interior wall of the switch box 20 144. A tamper cover (146) is secured to a correspondingly shaped recess (148) by cover screws (150) and (152). The tamper cover 146 can be regarded as a face plate having the same function as face plate 105 in Figure 1B. The tamper link device 121 is positioned across or attached to the cover 146 and casing 147. The male portion (123) of the tamper link (121) is embedded in or connected to the cover (146) at an underneath face thereof. 25 When it is in the position shown in Figure lE, the electrical circuit of which the tamper 13 link (121) forms a pail, is in a closed configuration. If anyone was to tamper with the cover (146) by unscrewing the fasteners (150) (or 152), in particular screw 150, this would set off an alarm through tamper switch device 119 as the lever of the switch device would no longer be in contact with the screw 150. This provides a first alarm that 5 can be sent to a remote location. Then removal of screw 152 in order to remove the cover 146 would disengage the male pail (123) of link (121) from the female part (125) which is located within the mounting box (144) and thereby break the circuit and enable a further signal or alarm to be sent to a remote location through the end of line unit (114) to indicate that the box (144) has been tampered with. A further secondary line of 10 security is provided with the tamper link 121. The tamper switch 119 has a lever which is in contact with screw 150 in a set position. Any dislodgement, tampering or removal of screw 150 activates the tamper switch to send a signal to a remote location. Alternatively, the tamper switch can be used to contact, through its lever, screw 152. Thus, two independent alarms can be generated, one from link 121 and the other from a 15 tamper switch 119 (associated with screw 150 or 152). The outer casing (147) is secured to the box (144) through a mounting screw (149). Routine testing can be applied by a technician using the screws 150, 152 and/or 149 without opening up entirely the box (144). All that has to be done is adjust screws 150, 152 and remove the cover plate (146) via the screws (150) and (152) to test screw 149. 20 Shown in Figure 1G is an electrical circuit (160) which includes a tamper link (121) that shows separately a connection of the male part (123) to the female part (125) through connectors (117) and (115). The link (121) is connected in series with the tamper switch 119, and in this instance a micro switch 119, which in turn is connected in series with the security module or end of line module (114). This is connected through a 25 pair of cables to a remote computer monitoring facility (not shown). Thus, any break in 14 the switch (119) or in the link (121) will open the circuit and enable a signal to be sent by the security module (114) back to the remote computer to indicate that the switch box (144) or (120) has been tampered with. Referring to Figures 1H and 1J there is shown a further embodiment of a switch 5 box (160). As with the embodiment in Figure ID it discloses a tamper switch device (119) and a tamper link device (121). A triple reed switch (163) is used. Two of the reeds/contacts of the triple reed switch (163) are used to detect opening and closing of a door or window when the box (160), made from aluminium for example, is mounted adjacent the door or window. The third contact or third reed may be used as an active to tamper ring (164) which is mounted in an aperture through mounting block (162) inside box (160). The ring 164 is made from a suitable metal and is essentially a hollow cylinder or sleeve which houses the reed switch 163. Removal of the reed switch 163 will set off an alarm to a remote location. It is possible for the active tamper ring (164) to detect a stronger magnet than is generally used with the reed switch which can be used to 15 defeat the magnet associated with the reed switch. The active tamper ring (164) detects such a large magnetic field and is able to generate an alarm. This supplies a further line of protection against unauthorised entry or tampering of the box (160). The triple reed switch is not designed to mount externally of a door frame or window frame, however the embodiments of Figures 1H and IJ makes this possible. 20 With references to Figures 2A to 2D, there is shown an embodiment of a switch box (200) that houses a micro-switch (202), an alarm monitor switch (204) which can be a reed or Magnasphere switch, and a tamper switch (206). The micro-switch box (200) has a rear wall (208), top wall (210), bottom wall (212) and side walls (214, 216) as well as a front wall (218). The front wall 218 may have a recessed portion (220) formed by a 25 third front wall portion consisting of walls 252, 254 and 251, existing between first and 15 second front wall portions (219, 221) through which extends a micro-switch actuator, being a plunger (222), through a respective aperture (224), the plunger (222) being in contact or proximity to the micro-switch (202). Flanges (223) and (225) extend beyond front wall portions (219) and (221) respectively to assist in connecting the switch box 5 (200) to the cover plate (230). A biasing means (226) is connected between the rear wall (208) and the back of the micro-switch (202). The switch box 200 may have a tamper link device positioned therein and function in a similar way to those tamper link devices described in this description. The switch box 200 may also be formed as a "matchbox" arrangement as previously described. 10 The recessed portion (220) in the front wall (218) accommodates a cover box 228, for covering a bolt or latch of an associated door/window lock, which extends from an internal side of cover or strike plate (230) in the region of the recess (220). The box (228) has an aperture (232), shaped to conform to the particular latch bolt (234) used in the door lock with the bolt (234) adapted to protrude through the aperture (232) in order 15 to make contact with the plunger (222). A pair of apertures 236 in the cover plate (230) is aligned with test points (237) of the tamper switch (206) to enable easy testing of the switch through a probe or fork used by a technician. Button (239) also serves as a test point which can be pressed inwardly by a technician. 20 In operation, in a closed position bolt (234) protrudes through aperture (232) and makes contact with plunger (222) in order to compress the plunger 222 against the force supplied in the biasing means (spring) (226), by compressing the spring (226) and therefore moving the micro-switch (202). This can send a signal through wires (238) to a remote location to indicate that the door or a window is in a locked or closed state. Upon 25 retracting the bolt (234) and opening a door or a window, the plunger (222) moves 16 outwardly under the force of the spring (226) expanding back to its original state and therefore pushing the micro-switch external to recess (220). Thus the micro-switch plunger (222) extends even further outwardly of the face of the recessed portion (220). This outward movement of the micro-switch plunger (222) triggers the switch (202) to 5 send a signal over the wire (238) and through conduit (240) to a remote location to alert that the plunger (222) is no longer in contact with bolt (234) and therefore most likely the door has been opened. Given the range of movement of the plunger (222) there is no need to have to set the distance between the bolt (234) and the plunger (222) as is required in the prior art. 10 A switch (204), such as a reed switch or a Magnasphere switch, detects opening and closing of the door to which the bolt 234 is attached by detecting the present or non presence of a corresponding ferro-magnetic material in the door or window portion that houses the bolt (234). When this happens, the signal is generated and transmitted along wire (242) to a remote location. 15 A tamper switch (206) also triggers a signal when an attempt is made to tamper with the box (200) and this is sent over wire (244) through the conduit (240) to a remote location. A further sensor, in the form of tilt sensor (242) is provided as evidence of movement or tampering of box (200). This can for example use mercury as its medium, so that any change in the orientation or level of mercury activates the sensor to send a 20 signal over cable (246) to the remote location. The plunger (222) can have a weatherproof rubber covering, which is ideally ribbed, to seal against dust and water ingress to the micro-switch (202) and the micro switch box (200). To a certain extent dust and water can also be kept out or away from the box (200) by cover box (228) as it has a top side (248) and bottom side (250) that is 25 preferably adjacent to the respective sides (252, 254) of recess (220). 17 Shown in Figure 2D are two variations on the lock cover box (228). The upper figure denotes a lock cover box having aperture (232) which is circular to correspond with a circular bolt from the article (door, window) and the lower figure has a square or rectangular aperture (232) to correspond with a rectangular or square bolt 234 from the 5 door/window. Preferably the clearance is minimal between the outside surface of the bolt (234) and the inside surface of the aperture (232). With reference to Figure 3A there is shown a further embodiment of a microswitch box (300) having therein a microswitch (302). The microswitch (302) is positioned within an adjustment bracket (308) which in turn is connected to a front wall 10 (304) of the box (300) by a pair of first fastening devices (310) and (312), such as screws. A further second pair of fastening devices in the form of screws (314, 316) secure the microswitch (302) after adjustment against a bottom wall (303) of switch box (300). Adjusting the position of microswitch actuator (318), so that it is positioned at the correct distance relative to contact through a latch bolt of a lock, is performed through the 15 adjustment screws (310, 312) which enables the adjustment bracket (308) to move towards or away from the front wall (304). A pair of slots (not shown) formed in the bottom wall (303) allows movement of the screws (314, 316), which are loose prior to installation of box 300. One or more grooves or guiding elements may be required to be formed in the bottom wall 303 to ensure that the pair of screws 314, 316 do not become 20 misaligned. Once the initial adjustment is made, then the microswitch (302) can be secured to the microswitch box (300) through the screws (314, 316) if there is no gap. Referring to Figures 3B and 3C it is seen that microswitch (302) is positioned within adjustment bracket (308) and the actuator or plunger (318) protrudes through wall (309) through corresponding aperture (311). A recess or open space (319) is formed and 25 is set back from portions 337 and 339 of front wall (304) of the box (300), portions 337 18 and 339 are positioned either side of recess 319. The walls 309, 350 and 352 are regarded as forming part of the front wall 304. The recess (319) enables space for the latch bolt of the associated lock to contact the plunger (318). The fasteners (310, 312) respectively connect to a first leg (313) of adjustment bracket (308) through respective apertures (324, 5 322). Each of the apertures 322, 324 are threaded to provide a threading action which would move the adjustment bracket (308) forwards and backwards to the required distance from wall (304). Once the correct adjustment has been made in relation to the plunger (318) and its contact with the latch bolt, the fasteners (316, 314) are screwed tightly into corresponding apertures (321, 323) in web 317 of adjustment bracket 308 and 10 through the pair of slots (not shown) in bottom wall (303) to secure the position of the microswitch (302) to the base or bottom wall (303) of box (300). A gap can exist between the interior of the bottom wall 303 and the microswitch 302 through the use of appropriate screws 314, 316 that enable the microswitch 302 to be firmly affixed to the screws 314, 316 but not directly touching the bottom wall 303, allowing the micro-switch 15 302 to move backwards and forwards without requiring to undo screws 314, 316.. This enables adjustment of screws 310, 312 in order to set the required distance of the microswitch 302 from the front wall 304 without opening up the entire box 300. A rear leg (315) is connected to the front leg (313) of the adjustment bracket (308) through web (317). This is more clearly seen in Figure 3E. 20 In operation, upon detection of actuator (318) being pushed inwardly through contact with a latch bolt tongue, which indicates that the bolt is latched in a closed position, a signal is sent to the end of line unit or security module (326) through wiring (325) and then a further signal is sent through wiring 327 to a remote monitoring system connected to the other end of the wiring (327). Wiring (327) extends through a rear 25 aperture (329) through back wall (306). Alternatively an aperture may be formed in 19 bottom wall 305, particularly for a matchbox design of box 300 where an outer casing encloses an inner tray that slides within the outer casing. A further signal can be sent when it is detected that the latch bolt tongue is not in contact with the actuator (318) anymore to indicate that the bolt is unlatched and such a 5 signal can be sent through the end of line module (326) to a remote monitoring terminal. Also fitted within the box (300) is a tamper switch 328 connected through wiring (331) to the end of line module (326). The tamper switch (328) will detect opening or tampering of box (300), and in particular detect removal or attempted removal of face plate 341 through screw 332. It can be serviced or tested by a technician through a screw 10 (such as 332) or an indentation that can be depressed located on the outside of the face plate 341. Also included is a tamper link device (330) which can detect opening or tampering with the box (300) by breaking the circuit which is attached to the end of line unit through wiring (333). As seen in Figure 3C, an additional device in an alarm switch (335) is supplied, 15 which can be a reed switch or a Magnasphere switch, that can detect the open or closed state of a window or door for example as previously described. Also shown is face plate 341 detached from front wall 304. It has a corresponding aperture 343 that fits over recess 319 and mounting holes that align with mounting holes in the front wall for securing the face plate 341 to the front wall 304 by suitable fasteners such as screws. 20 Referring to Figure 3F there is shown an alternate adjustment bracket (308) which has an aperture (336) in the web (317). The microswitch (302) can be housed within the opening (336) and secured in position by respective peripheries of the web (317) around the opening (336). The screws (314, 316) are still required to tighten and secure the microswitch 302 from further movement. A gap can exist between the interior of the 25 bottom wall 303 and the microswitch 302 through the use of the screws 314, 316 that 20 enable the microswitch 302 to be firmly affixed to the screws 314, 316 but not directly touching the bottom wall 303. Alternatively a shell may be formed around the microswitch (302) to prevent it from moving within the box (300). Referring to Figure 3G, there is shown a switch box (300) that is formed in two 5 parts, similar to a matchbox, in that there is an outer casing (340) made up of wall 306, front wall portions 337, 339, top wall (301) and underneath wall (303). Sliding within the outer casing (340) is a tray (342) which includes end walls (305) and (307), side walls (354, 356), and walls (309, 350 and 352). Mounted on the tray (342) are all the various components internal to the box (300). This matchbox form of the switch box 300 cannot 10 be separated, that is the tray 342 cannot be separated from the outer casing 340, without removing a tamper screw associated with tamper switch 328, which secures the inner tray 342 to the outer casing 340, and removing the tamper link 330. In Figure 3D there is shown the tray (342) with the adjustment bracket (308) connected to the front wall (304) through the fasteners (310, 312). Each of the fasteners is 310, 312 have a respective biasing means, in the form of a spring, mounted thereon 344, 346, in order to provide back pressure so that the screws 310, 312 do not become undone and hold the screws 310, 312 in place. A circlip is needed on each shaft of a respective screw 310, 312 to keep the springs 344, 346 in place. With reference to Figure 4A , there is shown a plan view of the switch box (400) with the outer casing of top cover 20 removed. In Figure 4A the switch box (400) has a actuator block (408) connected to a shaft (409) which activates a microswitch (402) when pressure by a latch bolt of a lock bears against plunger (418) connected either directly to the block 408 or indirectly to the block (408). A biasing means, such as spring 412 is connected between the block (408) and back wall (406). The shaft (409) is mounted so that it does not contact the back wall 25 (406) and leaves a small gap which is allowed to enable the block (408) to move 21 backwardly to activate the microswitch (402). The shaft is connected to bracket (410) and held in position by nut (411). Stoppers (415, 416) prevent the block (408) from moving past the maximum distance allowable. The latch bolt protrudes within space (419) after closing the door or window, with the box (400) positioned in a door jamb or 5 window frame. The co-location of the door or window in the frame can be sensed by an alarm monitor switch (435) such as a reed switch or a Magnasphere switch. When the latch bolt makes contact with the plunger (418) it will push against the plunger (418) which in turn moves block (408) to depress lever (420) of the micro switch (402) and therefore activate the micro switch (402) to send a signal over cable (425) to an end of 10 line module (426). This in turn can send a signal over line (427) out through opening (429) in the back wall (406) to a remote terminal to indicate the latch is in a closed position. Upon unlatching or moving the bolt away from the plunger (418), a further signal is set through the above communication lines when the lever (420) is not touching the block (408) and therefore the bolt has been retracted. Again, opening of the door or 15 window can be sensed through the alarm switch (435). The block (408) moves against the spring 412 according to the pressure or lack of pressure applied by the bolt of the lock. A tamper switch (428) is also positioned behind the wall (404) and can have a protruding element such as a screw (432) touching a lever (436) associated with the 20 tamper switch (428). Removal of the screw (432) or tampering thereof will activate the tamper switch (428) to enable it to send a signal through line (431) to the end of line module (426) which in turn is sent to a remote terminal or monitoring station over link 427. A tamper link (430) is also positioned attached to the rear wall (406) such that separation of the back wall (406) from the remainder of the box (400) will lead to 25 separation of a male component of the tamper link (430) from the female component and 22 therefore activate a signal over link (433), either directly to the end of line module (426) or to the tamper switch (428). The switch box of Figure 4A is preferably a matchbox design so that what is shown in the Figure represents a tray that slides in and out of a casing. The casing has an aperture to fit over recess 419 and the top wall is 407 while the 5 bottom wall is 405. Removal of the tray will necessitate breaking the tamper link device 430 and a tamper screw 432 associated with tamper switch 428. Where the plunger (418) is adjustable to accommodate varying distances moved by the latch bolt, an arrangement is shown in Figure 4B. This shows a screw (421) which protrudes through the plunger (418), through block (408) and uses the internal io thread (423) in the shaft (409). A biasing means, such as spring (422) is positioned between the head of the screw (421) and wall (440) of the block (408), the spring 422 having a greater spring force (or k value) than spring 412. Wall 440 and side walls (442 and (444) define a recess or opening (446) within which the plunger (418) can move or be adjusted inwardly or outwardly of the block (408) to adjust for movement and solid 15 contact with a latch bolt. Adjustments in or out of the plunger (418) with respect to the block (408) is made available through screw (421) and by having a small pin inserted through hole (414) which can contact one of the walls of box (400) so that the shaft (409) does not rotate while performing that adjustment. Once adjustment of the plunger (418) has been made, contact by a latch bolt 20 tongue against the outer face (448) of plunger (418) will push the screw (421) and therefore the block (408) (and shaft (409) which then moves backwardly against the pressure provided by spring 412 and will contact lever (420) of microswitch (402) to activate a signal, previously described, to indicate that the latch bolt is engaged or in a locked position. As mentioned previously, the block (408) cannot move beyond the 25 stoppers (415, 416). When the latch bolt is disengaged from the plunger (418), the block 23 (408) moves outwardly under the action of the spring 412 to resume its normal position. This sends a signal via the microswitch (402), as the block (408) would no longer be in contact with the lever (420), to indicate that the latch bolt is no longer in the locked state. Referring to Figure 4C, a different arrangement to Figure 4C is presented with 5 regard to an activator block used to trigger a microswitch. A stop (462) is mounted within the confines of the box (400) separate to the microswitch (466) and associated lever 468. The microswitch is generally mounted onto the bottom wall of the box (400). A flat biasing means, like spring (464) is attached to a front facing surface of the stop bracket (462). A shaft (476) is connected to and extends through the stop bracket (462) 10 and provides support for a fastening means such as screw (472). The shaft (476) protrudes through activator block (460) and a further spring (474) is mounted around the outside of the screw (472) between the head of the screw (472) and an interior wall (478) of the actuator block (460). A plunger (470) has an aperture through which the screw (472) extends and plunger (470) is adjustable to account for variations in different latch 15 bolts that would contact the plunger (470). The plunger (470) moves within a recess (484) bounded by walls (482, 480 and 478), adjustable through screw 472. A further screw 475 enables adjustment of a gap between the actuator block 460 and stop bracket 462, it stops the block 460 from moving too far forward. Spring 464 keeps the block from putting pressure on or touching the microswitch 466 and lever 468 in a resting state. 20 As the latch bolt makes contact with the plunger (470), it is depressed inwardly within the recess (484) fractionally and at the same time through the screw (472) then connected to the actuator block (460). This forces the actuator block (460) to retract or push against the spring force (464) until the actuator block (460) comes into contact with lever (468). This activates a microswitch (466) to provide a signal to a remote location 25 that the latch bolt is in the locking state. The purpose of the spring (464) is to ensure that 24 the actuator block (460) moves only a limited distance towards the microswitch 466 and when the latch bolt is released to an unlocked state, the spring forces the actuator block (460) back to its original position away from lever (468). Detachment of the latch bolt or tongue from the adjustable plunger (470) can set off another signal to the remote location 5 to indicate that the tongue or the lock is in an unlatched state. It is to be noted that microswitch 466 is not attached to stop bracket 462 but is adjacent one of the side walls of box 400. Separate independent adjustment of the plunger can be made through rotation of the screw (472) inwardly or outwardly so that the plunger can be set to the correct 10 distance to adequately interact with the latch bolt. A pin is required to be inserted in hole 478 and abut against an internal surface of the box 400 so that the shaft 476 does not rotate when performing the adjustment. Referring to Figure 5 there is shown a switchbox unit 500 that can be installed in a structure, such as doorjamb, in which an article such as a door moves between a locked 15 position and an unlocked position. The unit 500 includes a housing or switch box 502 in which is positioned a second compartment 504 for housing a microswitch unit 522 and a first compartment 508 for housing an end of line unit 518 and a tamper device 516, more particularly a tamper fuse. A face plate 510 (shown cut away near switch actuator 524 for clarity) is connectable to the front portion or front face 1000 (Figure IOA) of the housing 20 502. The switch means or microswitch unit 522 has switch actuator 524 protruding through aperture 523 in the compartment 504. The position of the actuator 524 can be adjusted by movement backwards and forwards of the compartment 504 through adjustment means 512, such as in the form of a bolt. The bolt 512 can have a resilient means in the form of a spring located around its thread in addition to the thread of the 25 bolt being locatable in a suitable threaded end nut, which is not able to rotate and this is 25 located in aperture 719, referring to Figure 7C. There is relative movement between the compartments 504 and 508 whereby they have respective sides joined to one another, being sides 704 and 600 where a protruding portion or flange 708 of compartment 504 is slidable with respect to recess 602 formed in the side 600 of the compartment 508. 5 A locking plate 514 (Figure 9) has an opening 920 which fits securely around the head of bolt 512 to prevent any unwanted movement or tampering with the bolt 512. The locking plate 514 is shaped and positioned so that in order to gain access to the bolt 512, the tamper device 516 would have to be firstly removed and this would set off an alarm. The locking plate 514 is adapted for movement within recess or opening 609 formed by 10 ledge 620 and lip 628 in the front face 606 of the compartment 508 (referring to Figure 6A). A gap is optionally provided in the upright member 622 so that the tail 924 of the locking plate 514 can move through that gap into space 624 which had previously been filled by the tamper device 516. Adjustment of the position of the actuator 524 can then be performed manually by rotating the head of bolt 512 using a suitable tool. Thus any 15 authorised personnel may make this adjustment. The housing or switch box 502 has an aperture 1020 (see Figure 10B) through which compartments 504 and 508 can be inserted to reside inside the housing 502 and thereafter to affix compartment 508 to the box 502. Compartment 504 is kept in place and adapted for slidable movement with respect to compartment 508 by the affixing of 20 compartment 508 to the box 502. An engagement arrangement between side 704 of compartment 504 and side 600 of compartment 508, in particular a tongue and groove system, enables such relative movement between the compartments 504 and 508. Fastening means or adjustment means 512 is threaded and engages with a threaded end portion, typically a nut which is placed or positioned in face 714 adjacent side 704. Thus 25 any movement or rotation of the fastener 512 in one direction will move the compartment 26 504, and therefore actuator 524, away from the front face 1000 of the box 502 and therefore away from the face plate 510. Rotation of the adjustment means 512 in the opposite direction will bring the actuator 524 and the compartment 504 closer to the face plate 510 and the front face 1000 of the box 502. 5 Actuator 524 is designed to protrude through aperture 523 of compartment 504, and be contacted by a latch bolt of a lock that can protrude through aperture 1016 of the front side 1000 of box 502 as well as through aperture 808 of the face plate 510. The position of the actuator 524 can be adjusted to suit the position of the latch or lock bolt. The latch bolt associated with a lock that is affixed in an article, such as a door, is able to 10 contact the actuator or plunger 524 to indicate it is in a closed or locked position. When the latch bolt is released from contact with the actuator 524, the actuator 524 springs back towards the face plate 510 and this indicates an opening or unlocked position of the latch bolt of the article or door. Referring to Figures 6A to 6F there is shown various views of the second 15 compartment 508 which houses tamper device 516 and an end of line unit 518. The tamper device 516 may be formed as a male and female portion whereby removal of the male portion from the female portion enables lateral or transverse movement of the locking plate in order to gain access to the adjustment means 512 and also to secure the adjustment means 512 from tampering. 20 The compartment 508 has a front face 606, a rear face 608, a first side 600, second side 610 and bottom face 612. On the first side 600 there is a recess 602 or groove 602 defined between an upper and lower portion of the side 600. Aperture 604 is used for wires to protrude between compartment 508 and 504 in order to connect the microswitch device 522 to an end of line unit 518 as well as other devices. Front face 25 606 has a boss 607 to enable a space for the adjustment means 512 which protrudes 27 through aperture 616. A recess 609 is formed between the shelf 620 and lip 628 to provide space for slidable movement of locking plate 514. There also exists aperture 618, which is an elongate slot, to enable variable positioning of a fastener device, such as a bolt or screw, that protrudes through aperture 927 in locking plate 524. Aperture 927 is 5 preferably threaded or has a threaded nut to engage and hold the bolt or screw which, in part,secures the face plate 510 or setting plate 820 to the front of the switch box 502. Portion 622 can be cut out to make an aperture therethrough so that the tail 924 of the locking 514 can extend into the space 624 which is ordinarily taken up by the tamper device or part of the tamper device 516. Thus the locking plate 514 can move within the 10 recess 609 between a position in which it secures and prevents adjustment of the adjustment means 512 to another position where the tail extends into the space 624 to enable access to the adjustment means 512. A stop 526 exists against the inner face of side 610 and a protruding wall 614 defines the space 624 in order to accommodate and house the tamper device 516. Aperture 520 in wall or side 610 is used for wiring 15 purposes. An aperture 623 also exists in the bottom face 612 to enable access for wires to protrude therethrough to connect the various elements inside the compartment 508 or housing 502. Referring to Figures 7A to 7E there are various views of the second compartment 504 shown. In Figure 7A the compartment 504 has a front side 706, a rear side 702, a 20 first side 704 and a second side 700 as well as a base 710. Aperture 523 formed in the front wall 706 is used to allow the actuator or plunger 524 associated with microswitch unit 522 to protrude therethrough. Cutout 712 is so shaped to follow part of the shape of the head of the adjustment means 512. Apertures 716 and 722 extend through respective sides 700 and 704 to provide empty spaces and effectively a double-skin wall on each 25 side of the compartment 504. These spaces are formed by injection moulding as part of 28 the overall manufacture of compartment 504 and make a lighter construction. The double skin wall provides additional security so that a person cannot access easily gain access to the interior portion above base 710 where microswitch unit 522 resides. For example, a person may be able to open the outer wall 730, 732 with a screwdriver but not 5 the inner walls 734, 736. Side 704 is shortened to enable a cutout to be formed by faces 714 and 715 (see Figure 7B), to provide room for adjustment means 512. Attached to the outer side of side 704 is a tongue or a flange 708 which is designed to fit within the recess or groove 602 of compartment 508. Aperture 719 is preferably threaded which protrudes through the face 714 to receive the threaded portion of adjustment means 512. 10 Alternatively a nut may be secured in a fixed position in the face 714 into which the shaft of the adjustment means 512 can protrude and inter-engage with. Figure 7B shows two mounting points or securing means 724 and 726 for providing access to the interior part of the switch unit 522. Referring to Figure 8A, there is shown a set-up (or setting) plate 820 having short 15 sides 822, 826 and long sides 824 and 828. Apertures 832 and 838 enable fastening means to secure the set-up plate 820 to a structure such as a door jamb. The set-up plate 820 allows an authorised user to adjust the actuator 524 and therefore the position of the microswitch unit 522 due to differing dimensions, shape and size of face plates, such as 510. Aperture 834 can be aligned with aperture 1010 on the front face 1000 of switch 20 box 502 and therefore be secured to one another through suitable securing means, such as a bolt or screw. Aperture 836 is aligned with aperture 927 of locking plate 514, with aperture 927 either being threaded or terminating in a threaded nut, so that a suitable fastener can affix set-up plate 820 to the box 502. Any additional length in the fastener can extend through aperture or slot 1013 which also aligns with apertures 927 and 836 25 and slot 618. Opening 830 is wider than corresponding opening 808 in face plate 510 to 29 allow a user access to the head of adjustment means 512 while the set-up plate 820 affixes or secures the box 502 in the structure, such as a doorjamb or window frame. Thus, the set-up plate 820 can be affixed to face 1000 of box 502 and to the structure to then enable a user to adjust the adjustment means 512 to provide the correct contact 5 setting between a latch or lock bolt of a lock (that can move through apertures 830 and 1016) with the actuator means 524 associated with microswitch unit 522. The tamper device 516 would have to be removed initially to enable the locking plate 514 to be slid sideways in recess 609 so that tail 924 can extend into space 624 and therefore expose the head of adjustment means 512 for the user to access. The fastener extending through 10 aperture 836 is screwed into aperture or nut 927 of locking plate 514 and can have a distal end extending through slot 1013 and slot 618 of compartment 508. This secures the set-up plate 820 to the box 502. Once the correct adjustment is achieved, the set-up plate 820 is removed from the face 1000 of box 502, the locking plate 514 is slid across or within the recess 609 so that a recess 920 of the locking plate surrounds the head of 15 the adjustment means 512 or otherwise blocks access to the adjustment means 512. The face plate 510 is then attached to face 1000 and the locking plate 514 as described in the paragraph following the next paragraph. Referring to Figure 8B there is shown a face plate 510 which has apertures 800 and 806 to enable fastening means to secure the face plate 510 to a structure such as a 20 door jamb. Aperture 802 is aligned with aperture 1010 and a fastener inserted to secure part of the face plate 510 to the box 502. Aperture 804, on the other side of opening 808, is aligned with threaded aperture 927 (or terminating in a nut) on locking plate 514, to receive a fastener, such as a bolt, to attach face plate 510 to the locking plate 514 while it is in position such that the end of the locking plate having recess 920 prevents access to 25 or movement of adjustment means 512. Any extended distal portion of the fastener can 30 protrude through aperture 1013 of box 502 and aperture 618. Each of the openings 808 and 1016 are aligned to enable movement in and out thereof of a latch or lock bolt of a lock on a structure, such as a door, to enable contact with the actuator 524. Due to the size of opening 808, access to the adjustment means 512 is not possible when face plate 5 510 is connected to box or housing 502. Shown in Figure 9 is a perspective view of the locking plate 514. It is secured to the front wall 606 of compartment 508 and specifically within the recess 609 formed between the lip 628 and the shelf 620. It is secured within recess 609 and is only able to have a transverse movement between the two positions earlier described. At one end of 10 the locking plate is a recess 920 formed by internal edge 922 and legs 916 and 918. The recess 920 is designed to fit around the head of the adjustment means 512 in order to lock and prevent movement of the adjustment means 512 as is seen in Figure 5. Any other such means at this end of the locking plate 514 can be used to prevent movement and access to the adjustment means 512. At the other end of the locking plate is a tail 924 15 having end edge 928 and formed partly by the top edge 930 and underneath edge 934. When the locking plate 514 is moved to release and enable access to the adjustment means 512, the tail 924 extends into the space 624 with edge 926 abutting against face 619 and edge 934 adjacent to or abutting part of the top surface of the portion 626 of compartment 508. Aperture 927 is adapted to be threaded or have a nut so that a fastener 20 can inserted therein to secure the set-up plate 820 or face plate 510 to the locking plate 514, which resides within recess 609, as previously described. Shown in Figures IOA to 1OC is the front face 1000 of housing or box 502. It includes a flange portion 1008 which has aperture 1010 for alignment with aperture 800 on face plate 510. Aperture 1018 is designed to fit around the head of the adjustment 25 means 512 while aperture 1019 is designed to enable placement of the tamper device 516 31 therethrough. The box 502 has front face 1000, rear face 1002, sides faces 1006 and 1004, top face 1014 and bottom face 1012. The side 1004 has aperture 1020 for receiving both compartments 508 and 504. Referring to Figures 1 A to 1 ID there is shown an end of line protection cover 5 1100. It has rear wall 1102 and side wall 1104 with a base 1106. Cut out of the top of the side 1104 is a recess 1114 for receiving wires while a channel 1116 is formed between wall 1108 and an interior face of an angled abutment 1120. Side 1102 has an end part 1112 which extends along part of an opposite side to side 1104 while pillar 1110 is located on the same side but opposite the portion 1112. 10 In assembling the device 500, the compartment 504 is fitted to compartment 508 through the inter-engagement of the respective sides 600 and 704. These are then positioned inside the housing or box 502 and compartment 508 is affixed to the housing or box 502. Meanwhile the compartment 504 is free to slide forwards and backwards with respect to compartment 508. Prior to this, the locking plate 514 is positioned within 15 the recess 609 and the adjustment means 512 is put in position with the locking plate 514 placed over the adjustment means 512. The apparatus 500 can then be placed in a cavity in the doorjamb and adjustment of the actuator 524 can be made through the interaction of the latch bolt of the corresponding door. A set-tip plate 820 can also be used as previously described to enable correct adjustment of the actuator 524 with respect to the 20 latch bolt (with the locking plate in a position to enable clear access to the adjustment means 512). Once the correct adjustment has been made by movement of the adjustment means 512, which in turn moves the actuator 524, switch 522 and compartment 504 as previously described, then the locking plate 514 is slid into position so that it prevents access to the head of the adjustment means 512. The tamper device 516 can be inserted 25 into a corresponding female part or otherwise more appropriately wired to an alarm. 32 After removal of the set-up plate 820, the face plate 510 is then suitably secured to the box or housing 502 and to the door jamb frame using suitable fastening means through the apertures 800, 802, 804 and 806. In this arrangement the adjustment means is covered by the face plate 510 as is the tamper device 516. 5 With this unit as assembled it is not possible to adjust the adjustment means 512 and therefore the position of the actuator 524 without setting off an alarm through removal of part or all of the tamper device 516. In order to adjust the position of the actuator 524, and therefore provide access to the adjustment means 512, the face plate 510 is removed, then the tamper device 516 is removed, the locking plate 514 is slid 10 across to the open position so that access is available to the head of the adjustment means 512. The set-up plate 820 can then be used to make an adjustment to the adjustment means 512. This is all done without having to dismantle the switch box 502. 33

Claims (14)

1. A switch box for installation in or on a structure in which an article moves between a locked position and an unlocked position, the switch box including: 5 switch means housed within the switch box; actuator means associated with the switch means; said actuator means adapted for movement between a first position and a second position to indicate a locked position and an unlocked position of the article; adjustment means for adjusting the position of the actuator means; 10 wherein the location of the actuator means is adjustable without dismantling the switch box and unauthorised access to said adjustment means requires a tamper device or part thereof to be removed thereby activating an alarm.

2. A switch box according to claim 1 further including a second compartment for 15 housing said switch means and wherein said adjustment means is connected to said second compartment for adjusting the position of the actuator means.

3. A switch box according to claim 2 further including a locking plate adapted to move between a first closed position in which the locking plate prevents access to said 20 adjustment means and a second open position that allows access to said adjustment means.

4. A switch box according to claim 3 such that in order to move said locking plate to the second position, the tamper device or part thereof is required to be removed thereby 25 activating an alarm. 34

5. A switch box according to claim 3 or claim 4 wherein the locking plate has a recess at one end for securing and preventing movement of the adjustment means in the first position and a tail at a second end that protrudes into a space occupied by said tamper device or said part of a tamper device in said second position. 5

6. A switch box according to claim 5 further including a first compartment for housing said tamper device and an end-of-line module.

7. A switch box according to claim 6 wherein the first compartment is engaged with 10 the second compartment through a first side of the first compartment and a first side of the second compartment.

8. A switch box according to claim 7 wherein said first side of the second compartment is slidable with respect to the first side of the first compartment through a 15 tongue and groove arrangement.

9. A switch box according to claim 8 wherein said adjustment means is a fastening means and is connected to said second compartment adjacent said first side of said second compartment. 20

10. A switch box unit having the switch box of any one of the preceding claims and a face plate attachable to said structure.

11. A switch box unit according to claim 10 wherein a set-up plate is used prior to 25 attaching said face plate in order to enable adjustment of the adjustment means. 35

12. A method of installing a switch box in or on a structure in which an article moves between a locked position and an unlocked position, the method including: housing switch means within the switch box; 5 providing actuator means associated with the switch means; said actuator means adapted for movement between a first position and a second position to indicate a locked position and an unlocked position of the article; adjusting the location of the actuator means without dismantling the switch box; wherein unauthorised access to said adjusting step requires removal of a tamper 10 device or part thereof, said removal activating an alarm.

13. A method according to claim 12 further including the step of providing a locking plate adapted to move between a first closed position in which the locking plate prevents said adjusting step and a second open position that allows said adjusting step. 15

14. A method according to claim 13 wherein in order to move said locking plate to the second open position, the tamper device or part thereof is required to be removed. 36