WO2021079110A1

WO2021079110A1 - Terminal block mounting

Info

Publication number: WO2021079110A1
Application number: PCT/GB2020/052645
Authority: WO
Inventors: Clym Brown; Peter Alexander
Original assignee: Texecom Limited
Priority date: 2019-10-23
Filing date: 2020-10-21
Publication date: 2021-04-29
Also published as: GB201915329D0; GB2589305B; GB2589305A9; GB2589305A

Abstract

A security device, such as a passive infra-red motion detector (1) is provided with a terminal block (16). The terminal block (16) is movably mounted by means of first clips (21) and second clips (22), such that it can be rotated between a use position and a set-up position.

Description

Terminal Block Mounting

Technical Field of the Invention

The present invention relates to terminal blocks, in particular the mounting of terminal blocks in security devices, in particular in sensors and especially in passive infra-red motion detectors (known in the art as PIRs, which stands for Passive Infrared Receivers).

Background to the Invention

Passive infra-red motion detectors are security devices used in alarm systems to detect movement, which can be indicative of an intruder, and relay a corresponding signal to a control panel, so as to trigger an alarm, for example.

Passive infra-red motion detectors for use in alarm systems are typically of two- part design, with a housing having a front section and a rear section. The rear section is attached to a wall or ceiling and the front section is removable from the rear section, e.g. for set-up or servicing.

Battery powered wireless passive infra-red motion detectors are known, which can be installed without wiring the detector to the power and/or the control panel. However, this invention is primarily concerned with wired passive infra-red motion detectors, which are typically provided with a terminal block, arranged in the rear part, normally near the top, with openings facing upwards to receive wires and screws facing outward (i.e. towards the front section when assembled) to fix each wire in position.

In this arrangement, exemplified for example by the Texecom (RTM) Premier Elite range of PIRs, a sufficient gap must be provided between the upwardly facing openings and the top of the rear section of the housing to allow a cable to be threaded into the housing above the openings and the wires manipulated into position in their respective openings.

Leaving a large gap is a waste of valuable space, whereas with a small gap, installation can be very difficult.

The present invention seeks to overcome or at least ameliorate one or more problems with the prior art and/or to provide an improved security device. Summary of the Invention

According to a first aspect of the invention, there is provided a security device comprising a terminal block; wherein the terminal block is moveably mounted to the security device. Moveably mounting the terminal block to the security device allows the angle of the block to the device to be adjusted (without removing it).

The terminal block may be mounted for movement between a set-up position and a use position.

The terminal block may be arranged at a different angle in the set-up position from that of the use position.

The terminal block may be rotatably mounted. It may, therefore, be rotatable between the set-up position and the use position.

Such an arrangement, in which the terminal block can be moved whilst mounted, means that it can be put in a position which is easy for set-up for setting up (e.g. with openings for wires facing outwards to a degree), meaning a smaller gap is required for the installer to manipulate the wires into position, but once set-up, the block can be moved to a use-position in which it takes up less room (and in which the connections between the wires and the terminal block may be less exposed and hence less likely to be inadvertently disconnected). The terminal block may be rotatably mounted by means of clips. In particular, the terminal block may be mounted by one or more, for example a pair of, first clips, and one or more, for example a pair of, second clips. The first clip(s) may be more firmly attached to the terminal block than the second clip(s). The terminal block may, therefore, be mounted so as to unclip from the second clip(s) and remain clipped in by the first clip(s) whilst rotating, e.g. from the use position to the set-up position.

The clips, e.g. the first clip(s) and optionally the second clip(s) may each comprise mounts extending from the device and provided with one or more tooth to grip the terminal block. The mount(s) of the first clip(s) may be stiffer than the mount(s) of the second clip(s), so as to be more resistant to flexing and unclipping. The tooth or teeth of the first clip(s) may be provided with a larger main contact surface than the tooth or teeth of the second clip(s), so as to be more resistant to unclipping.

The tooth or teeth of the second clip may be provided with a tapered main contact surface to allow unclipping more readily from one end (distal from the first clip) to encourage rotation. The tooth or teeth of the first clip(s) may be provided with a secondary contact surface arranged at an angle to the main contact surface, to provide a stop against excess rotation.

Whilst these distinctions between the first clip(s) and the second clip(s) are preferable, it is considered acceptable for the first and second clip(s) to be identical, since those skilled in the art could easily unclip only the second clip(s), even if both first and second clip(s) are equally resistant to unclipping and moreover, in practice, the devices could be sold with the terminal blocks in the set-up position and simply rotated into the use position after set-up, in which case an installer would not have to work out how to unclip only the second clip(s).

The device may be provided with one or more, for example a pair of, guides, for example resilient guides, e.g. guides arranged to co-operate with the first and second clip(s) to prevent movement (e.g. lateral movement) of the terminal block. Any or all of the first and second clips and the guide may be arranged laterally of the terminal block.

The device may be provided with a first stop to stop longitudinal movement of the terminal block in a first direction. The first stop may provide a fulcrum around which the terminal block rotates. In particular the first stop may be arranged below the terminal block, with respect to the intended orientation of the housing in use, to stop movement of the terminal block downward with respect to the housing. The device may be provided with a second stop to stop longitudinal movement of the terminal block in a second direction, which may be opposite to the first direction. In particular the second stop may be arranged above the terminal block, in the use position, to stop movement of the terminal block upward with respect to the housing.

The terminal block may be mounted to a housing of the device. The terminal block may be mounted to a rear section of the housing of the device.

The housing (and/or the rear section of the housing) may have a top and a bottom (with the top intended to be mounted above the bottom in use).

The housing (and/or the rear section of the housing may have one or more raised edges. In particular, the housing (and/or the rear section of the housing) may have a raised edge at the top.

The terminal block may comprise a plurality of openings for receiving wires. The openings may face the top of the housing in the use position. In particular, the openings may face a raised edge (for example the raised edge at the top of the rear section of the housing) in the use position. The openings may be 2cm or less, 1cm or less, .075cm or less, or 0.5cm or less from the edge that they face. These dimensions allow better use of space, so that a more compact device can be produced.

The openings may face outward in the set-up position, e.g. they may be moveable to an angle of for example at least 20 degrees, at least 30 degrees or at least 45 degrees from the top, in the set-up position. This can allow the openings to be accessed easily for set-up, despite a small gap between the openings and the edge that they face in the use-position.

The terminal block may comprise fasters, such as screw fasteners associated with the openings to fix the wires in the terminal block. The fasteners may be arranged orthogonal to the openings, i.e. they may face outwards perpendicular to the top and bottom in the use position.

The terminal block may comprise a connector for connection to a corresponding connector attached to the electronics of the device (which may include a sensor, e.g. an infra-red sensor and/or a signal processor and/or a transmitter/receiver/transceiver/relay). The corresponding connector and the electronics of the device (which may include a sensor, e.g. an infra-red sensor and/or a signal processor and/or a transmitter/receiver/transceiver/relay) may be provided on a front section of the housing of the device. The connector may face the bottom of the housing in the use position and may face inward (i.e. towards a wall to which the housing is mounted) in the set-up position. For example, the connector may comprise an opening which faces the bottom of the housing in the use position, such that a corresponding connector attached to electronics of the device in a front section of the housing can be slid into the connector of the terminal block as the front section is connected to the rear section by a sliding fastening.

Alternatively, the connector may face outward in the use position and may face outward and downward (in the same direction as the fasteners) in the set-up position. For example the connector may comprise an opening which faces perpendicular to the top and bottom (and sides) in the use position, such that a corresponding connector attached to electronics of the device in a front section of the housing can be pushed into the connector of the terminal block as the front section is connected to the rear section by a clamshell fastening (in which the front section is pivoted onto the rear section from a mounting point, for example at the top).

The security device may be a sensor. The security device may be a passive infra-red motion detector. Alternatively, it could for example be any electronic security device that requires cable wiring - for example, other types of sensor; a communicator; a network expander; a power supply; or control and indicating equipment.

According to a second aspect of the invention there is provided a method of installing a security device according to the first aspect of the invention (optionally including any optional features), the method comprising the step of connecting wires of a cable to the terminal block in a set-up position, then moving the terminal block to a use position.

The method may comprise the step of clamping the wires in the set-up position, or the wires may be connected loosely, then clamped after moving the terminal block to the use position.

The positions may be relative to a housing. The method may comprise rotating the terminal block between the positions. The method may comprise attaching the housing to a wall or ceiling.

Detailed Description of the Invention In order that the invention may be more clearly understood one or more embodiments thereof will now be described, by way of example only, with reference to the accompanying drawings, of which:

Figure 1 shows a front-perspective view of a passive infra-red motion detector according to the invention;

Figure 2 shows a plan view of the inside of two halves the passive infra-red motion detector of figure 1 in its open state, looking from front to rear at the back section and from rear to front at the front section;

Figure 3 shows a side-perspective view of the inside of the rear section of the passive infra-red motion detector of figures 1-2 in the region of the terminal block, which is in its use configuration;

Figure 4 shows a side-perspective view of the inside of the rear section of the passive infra-red motion detector of figures 1-3 in the region of the terminal block, which is in its set-up configuration; Figure 5 shows a close-up perspective view of the inside of the rear section of the passive infra-red motion detector of figures 1-4 in the region of the clips for the terminal block, which is in its set-up configuration;

Figure 6 shows a top-perspective view of the inside of the rear section of the passive infra-red motion detector of figures 1-5 in the region of the terminal block, which is in its set-up configuration;

Figure 7 shows a close-up side-perspective view of the inside of the rear section of the passive infra-red motion detector of figures 1-6 in the region of the clips for terminal block, with the terminal block removed; and

Figure 8 shows a close-up plan view of the inside of the rear section of the passive infra-red motion detector of figures 1-7 in the region of the clips for the terminal block, with the terminal block removed.

Referring to the figures and in particular figure 1, a security device in the form of a wired passive infra-red motion detector (hereafter a “PIR”) 1 is illustrated. The PIR 1 is of two-part construction formed from a housing having a front section 2 and a rear section 3 (both e.g. injection moulded from plastics material). The PIR 1 comprises a lens 4 facing forward from the front of the front section 2 of the housing, behind which known, and therefore not shown, electronics, including an infra-red sensor, a signal processor a transceiver are located.

As shown in figure 2, a casing 5 is provided internally, i.e. at the rear of the front section 2 of the housing, encasing the electronics. Certain parts of the electronics extend through the casing so as to be accessible when the housing is open, such as adjusters 6, 7, and, from the top of the casing, extending upwards, a connector 8.

In this embodiment, the front and rear sections 2, 3 of the housing are both of generally rectangular tray-shaped form, with raised edges at both the long sides and shorter ends. The PIR 1 is intended, normally, to be mounted with its long sides vertical, a top end at the top and a bottom end at the bottom - in the orientation shown in figure 2. Various holes (or regions in which an installer can form holes) 18 are provided through the rear section 3, so that it can be attached to a wall by conventional means (e.g. screw fasteners extending from the interior of the housing through the rear section 3 into the wall). However, it is to be understood that this generally rectangular form is not essential and that the PIR 1 could work in other orientations.

The raised edges of the front section 2 abut the raised edges of the rear section 3 when assembled, defining a cavity within. To connect the front section 2 to the rear section 3, the front section is provided with two tabs 9 extending upwardly in-use into the cavity from the rim of the edge at the bottom end; the two tabs 9 are arranged to co operate with, a pair of corresponding apertures 12 (visible in figure 6) in projections 10, which extend forward/outward in-use, the tabs 9 extending up through the apertures in the projections 10, in use.

Similarly, the rim of the edge at the top end of the rear section 3 is provided with two tabs 11, which extend downward in-use, into the cavity. These tabs 11 co operate in a similar fashion with apertures 13 provided in projections 14, which extend rearward in-use. In consequence, the two sections 2, 3 of the housing can be attached together by a sliding connection, with the front section 2 placed slightly out of registration with the rear section 3, below it, then slid up into registration with the rear section 3; the projections 9 of the front section 2 entering the apertures 12 of the rear section, and the projections 11 of the rear section entering the apertures 13 of the front section. A latch 15 provided at the bottom of the rear section 3 and accessible by a screwdriver or the like from below the PIR 1 can be closed to maintain the closed state of the PIR 1 once the front and rear sections 2, 3 are attached together and opened to allow the sections 2, 3 to be slid apart for access.

A terminal block 16 is mounted in the rear section 3, near its top end. In view of the sliding connection of this embodiment, the terminal block 16 is provided with a connector having an opening 17, which in a use-configuration faces downward, so as to receive the upwardly extending connector 8 of the front section 2, when the two sections are slid into attachment. Accordingly, detaching the front section 2 from the rear section 3 disconnects the electronics from the terminal block 16. Since in use the terminal block will be wired to a control panel (not shown) of an alarm system, this disconnection can be detected from a loss of signal and appropriate action can be taken e.g. the alarm may be triggered or a fault signal emitted to indicate apparent tampering with the PIR 1.

The terminal block 16 comprises a series of (in this case seven) screws 19 arranged laterally across the terminal block 16 and facing perpendicular to the connector 17, i.e. forwards/outwards towards an installer in the use-configuration of figures 2 and 3.

A corresponding series of (seven) wire-receiving openings 20, best seen in figure 6 extend laterally across the terminal block, extending upwards in the use- configuration of figures 2 and 3, with their openings diametrically opposite the connector opening 17 of the terminal block 16 and perpendicular to the screws 19, which, as is conventional, are operable to clamp wires (not shown) in respective openings 20.

The terminal block 16 is of so-called “euro-block” construction and is an off- the shelf component.

As alluded to above, the terminal block 16 has a use configuration, or use- position, shown in figures 2 and 3, in which (with the PIR 1 mounted top-up) the connector opening 17 faces downward, the wire receiving openings 20 face upward and the screws 19 face forward (with their heads towards an installer).

However, the terminal block 16 is moveably mounted and can thus be moved between its use position and a set-up position (or set-up configuration), as shown in figures 4-6. The terminal block 16 is rotatable between these positions, owing to the manner in which it is mounted to the device 1.

The set-up position is a position in which the terminal block 16 is arranged to make connection of wires to the wire-receiving openings 20 easier.

As can be seen from figures 2 and 3, in the use-position there is a relatively small gap between the top of the terminal block 16, where the openings are located and the inside of the raised edge at the top of the rear section 3 of the housing which faces the openings 20, the gap being less than about 1cm and in the order of 0.5cm.

To wire in the PIR 1, an installer needs to thread a cable (not shown) through a hole in the rear section, ideally through a central top hole 20, or possibly one of the top holes 18 intended for attaching the connector to the wall, if that is more convenient. Then, the wires (not shown) of the cable (not shown) need to be attached to the respective wire-receiving openings for their relevant function (e.g. Ov, 12v, 2x alarm wires, 2x tamper wires). This could be very difficult with the terminal block in the use- position of figures 2-3.

Thus, for set-up, the terminal block 16 is placed in the set-up position shown in figures 4-6.

The mounting apparatus for the terminal block 16 is shown in the absence of the terminal block in figure 8. With particular reference to figure 8, the mounting apparatus of this embodiment includes a first stop, or bottom- stop 23, which is a short projection, projecting forward from the flat surface of the tray-like rear section 3 of the housing and extending laterally across the rear section 3, arranged to stop the terminal block 16 from sliding downwards with respect to the housing and act as a fulcrum about which the terminal block 16 can rotate.

The mounting apparatus further comprises a pair of laterally spaced opposing first clips 21 and a pair of laterally spaced opposing second clips 22. The first and second clips 21, 22 project forward from the flat surface of the tray-like rear section 3 of the housing and are arranged such that the first clips 21 are slightly closer to the top of the rear section than the bottom-stop 23, and the second clips 22 are closer still to the top; thus, as shown in figures 2-6, both clips extend alongside the lateral sides of the terminal block 16 and clip onto its foremost surface.

The first clips 21 are formed so as to be more firmly attached to the terminal block 16 than the second clips 22, such that the terminal block 16 can unclip from the second clips 22 and rotate about the bottom stop 23 from the use position to the set-up position, whilst held by the first clips 21.

The first clips 21 and the second clips 22 each comprise mounts 21a, 22a extending outwards/forwards from the flat surface of the tray-like rear section 3 of the housing, with each mount 21a, 22a provided with a tooth 21b, 22b at its end to grip the terminal block 16.

The mounts of the first clips 21 are stiff er than the mounts of the second clips 22, so as to be more resistant to flexing and unclipping (for example, they can be made thicker than the mounts of the second clips 22 or made of a different material - in general, the housing and the mounts are formed of suitable plastics materials).

As best seen in figure 7, the teeth 21b, 22b have a main contact surface 21c, 22c, which extends perpendicular to the length of the mount, so as to hold the terminal mount 16 against outward movement (i.e. towards the front of the mounted PIR) when the terminal block is in the use position of figures 2 and 3. The first clips 21 may be provided with a larger main contact surface 21c than the teeth of the second clips 22, so as to be more resistant to unclipping, for example, although not shown, the main contact surface 21c of the first teeth 21b can be deeper, extending over a greater area of the terminal block 16.

Again, although not visible from the figures, the teeth 22b of the second clip can have a tapered main contact surface 22c, to allow unclipping more readily from one end (distal from the first clip) to encourage rotation.

The teeth 21a of the first clips 21 are provided with a secondary contact surface 22d arranged at an angle to the main contact surface 21c, to provide a stop against excess rotation. The secondary contact surface 2 Id is at approximately 45 degrees to the main contact surface 21c angled upward and outward from the bottom-stop 23.

In this embodiment, the second clip 22 also has an angled secondary contact surface 22d, but this serves no particular function other than reducing the size of the main contact surface 22c, making it easier to unclip.

The teeth 21a, 22b are generally wedge-shaped, each tapering away from the main contact surface to a tip the distal ends of the clips 21, 22, so as to define a wider gap at their distal ends than at the main contact surface 21c, 22c. They are formed of a resilient material, and in consequence, the terminal block 16 can be clipped into position beneath the main contact surfaces 21c, 22c, simply by pushing it towards the generally flat surface of the rear section, which causes the mounts to bend laterally apart, then once the terminal block has passed the main contact surfaces, to return (or resile) to their original position clipping the terminal block 16 in place.

The PIR 1 is also provided with a pair of resilient guides 24; these, like the clips 21,22 are arranged laterally of the terminal block 16 so as to co-operate with the first and second clips 21, 22 to prevent lateral movement or twisting of the terminal block 16.

Finally, with downward motion restricted by the bottom-stop 23 and lateral motion in either direction restricted by the clips 21, 22 and the guides 24, any further longitudinal movement in the plane (e.g. upward in-use) is restricted by a second stop, or “top-stop” 25 and two comer-stops 26, all projecting out from the generally flat surface of the rear section 3 to stop movement of the terminal block 16 upward with respect to the housing. Of course, when the terminal block 16 is in its use position motion towards the flat surface of the rear section 3 is prevented by that surface itself, and outward, or “forward” movement, away from the rear, towards the front of the PIR 1 is restricted by the main contact surfaces 21c, 22c of the clips 21, 22.

In use, an installer locates the location where the PIR 1 is to be installed, typically the comer of a room, to which a cable with all the necessary wires has been run from a security alarm control panel (not shown). If the PIR 1 has been supplied with the front section 2 and rear section 3 attached, the installer detaches the front section 2 from the rear section 3 of the housing of the PIR 1 and selects which apertures 18 that are to be used to mount the PIR 1, then marks the wall (not shown) and introduces suitable fastenings into the wall (e.g. wall plugs), optionally first drilling holes in line with the marks. The cable (not shown) is then threaded through the central top hole 20 and the ends of the wires (not shown) are exposed. Then, screws (not shown) are introduced through the selected holes 18 to attach the rear section 3 of the housing to the wall. At this point, the PIR may have been supplied to the installer with the terminal block 16 in the set-up position of figures 4-6, in which the top of the terminal block 16, on which the openings 20 are formed has been rotated away from flat surface of the rear section 3, so that the openings are spaced further from that surface and face outward (forward) by about 45 degrees.

If, on the other hand, the PIR was supplied with the terminal block 16 in the use-position of figures 2-3, he/she can grip the sides of the terminal block 16 near its top (beyond the clips 21, 22) and pull the top away from the flat surface of the rear section 3. This will overcome the resistance provided by the second clips 22 (or if necessary they can be urged apart from one another), such that the block is only held by the first clips 21, which hold it in place near the bottom as it rotates about the bottom stop 23 to adopt the set-up position of figures 4-6, in which the top of the terminal block 16, on which the openings 20 are formed has been rotated away from flat surface of the rear section 3, so that the openings are spaced further from that surface and face outward (forward) by about 45 degrees. The secondary contact surface 21d of the teeth 21b of the first clips 21 stops further rotation.

In practice, the PIR 1 is likely to be shipped in the use-position, because this allows the whole device to be connected, whereas with the rotatable terminal block 16 in the set-up position, its connector opening 17 is tilted backwards, so the corresponding connector 8 of the front section 2 cannot be introduced into it and the front section 2 cannot be slid into connection with the rear section 3.

With the terminal block 16 in the set-up position of figures 4-6, the installer then connects the exposed ends of the wires (not shown) to the respective openings 20 of the terminal block 16 in the known fashion. This is facilitated by the fact that the openings face forward to an extent, and are not obstructed by the raised top edge of the rear section 3.

Once the wires (not shown) are all connected and the clamping screws 19 tightened (or prior to tightening the clamping screws 19 if preferred), the terminal block

16 is gently pushed backwards near its top, so that it rotates about a lateral axis defined by the bottom stop 23 back into alignment with the rear section 3 (if not yet tightened, the clamping screws 19 are then tightened). This brings the connector opening 17 into position facing downward ready to accept the connector 8 of the front section. Having made any necessary adjustments/settings using the adjusters 6, 7 on the front section 2, the front section 2 is then located with its rear facing the front of the rear section 3 and disposed slightly out of registration with the rear section, downwards thereof, the slid upwards such that the connector 8 of the front section 2 enters the connector opening

17 of the rear section 3 and respective projections 9, 11 enter respective apertures 12, 13, until the front section and rear section are in registration, as shown in figure 1. The latch 15 is then turned to maintain the closed state.

It will be appreciated that this method allows for less space to be wasted between the top of the terminal block 16 and the top edge of the rear section of the housing. Of course, it may be noted that the terminal block 16 sticks out further in its set-up position than the use position, but that the cavity inside the housing only needs to be big enough to accommodate it in the use position, so it can be of a more slimline, less obtrusive design, which is desirable both from the point of view of aesthetics/interior design and in terms of minimising the visibility of aspects of the alarm system to make it more difficult for would-be intruders to identify the location of the detectors.

The one or more embodiments are described above by way of example only. Many variations are possible without departing from the scope of protection afforded by the appended claims.

Claims

1. A security device comprising a terminal block; wherein the terminal block is moveably mounted to the security device.

2. A security device according to claim 1 wherein the angle of the terminal block to the device to be adjusted without removing it.

3. A security device according to any preceding claim wherein the terminal block is mounted for movement between a set-up position and a use position.

4. A security device according to claim 3 wherein the terminal block is arranged at a different angle in the set-up position from that of the use position.

5. A security device according to any preceding claim wherein the terminal block is rotatably mounted.

6. A security device according to claim 5 when dependent on claim 4 wherein the terminal block is rotatable between the set-up position and the use position.

7. A security device according to any preceding claim wherein the terminal block can be moved whilst mounted to a position for set-up, with openings for wires facing outwards to a degree, and once set-up, the block can be moved to a use- position in which it takes up less room and in which the connections between the wires and the terminal block are less exposed.

8. A security device according to claim 5 or any claim dependent thereon wherein the terminal block is rotatably mounted by means of clips.

9. A security device according to claim 8 wherein the terminal block is mounted by one or more first clips, and one or more second clips.

10. A security device according to claim 9 wherein the terminal block is mounted by a pair of first clips and a pair of second clips.

11. A security device according to claim 9 or 10 wherein one or more or each first clip is more firmly attached to the terminal block than one or more or each second clip; and wherein the terminal block is mounted so as to unclip from one or more or each second clip and remain clipped in by one or more or each first clip whilst rotating.

12. A security device according to any of claims 9-11 wherein one or more or each first clip and one or more or each second clip comprise mounts extending from the device and provided with one or more tooth to grip the terminal block.

13. A security device according to claim 12 wherein the mounts of the one or more or each first clip is stiffer than the mount of one or more or each second clip, so as to be more resistant to flexing and unclipping; and/or the tooth of one or more or each first clip is provided with a larger main contact surface than the tooth of one or more or each second clip, so as to be more resistant to unclipping.

14. A security device according to claim 12 or 13 wherein the tooth of one or more or each second clip is provided with a tapered main contact surface to allow unclipping more readily from an end distal from the first clip to encourage rotation.

15. A security device according to any of claims 12 to 14 wherein the tooth of one or more or each first clip is provided with a secondary contact surface arranged at an angle to the main contact surface, to provide a stop against excess rotation.

16. A security device according to any of claims 8-15 further comprising a pair of resilient guides to prevent lateral movement of the terminal block.

17. A security device according to any of claims 8-16 wherein any or all of the first clips, and second clips and the guide, where present, are arranged laterally of the terminal block.

18. A security device according to claim 17 further comprising a first stop to stop longitudinal movement of the terminal block and provide a fulcrum around which the terminal block rotates; and a second stop to stop longitudinal movement of the terminal block in the opposite direction.

19. A security device according to claim 3 or any of claims 4-18 when dependent thereon wherein the terminal block is mounted to a rear section of the housing of the device; the rear section of the housing having a top and a bottom with the top intended to be mounted above the bottom in use; and the rear section of the housing having a raised edge at the top; wherein the terminal block comprises a plurality of openings for receiving wires, the openings facing the raised edge at the top of the rear section of the housing in the use position.

20. A security device according to claim 19 wherein the openings are 1cm or less, from the edge that they face.

21. A security device according to claim 19 or 20 wherein the openings face outward in the set-up position and are moveable to an angle of at least 20 degrees from the top, in the set-up position.

22. A security device according to any of claims 19-21 wherein the terminal block comprises fasteners associated with the openings to fix the wires in the terminal block; the fasteners arranged orthogonal to the openings; and wherein the terminal block comprises a connector for connection to a corresponding connector attached to electronics of the device provided on a front section of the housing of the device; the electronics including a sensor, a signal processor, and at least one of a transmitter, a receiver, a relay or a transceiver.

23. A security device according to claim 22 wherein the connector faces the bottom of the housing in the use position and faces inward in the set-up position.

24. A security device according to any preceding claim which is a passive infra-red motion detector.

25. A method of installing a security device according to claim 3 or any of claims 4-24 when dependant thereon; the method comprising the step of connecting wires of a cable to the terminal block in the set-up position, then moving the terminal block to the use position.