FABRICATED LATCH EYE ASSEMBLY FOR AN EXCAVATOR SHOVEL FIELD OF THE INVENTION [001] The present invention relates generally to earth movement equipment, particularly to latch eyes disposed on a shovel of an excavator. BACKGROUND TO THE INVENTION [002] Excavator shovels move between an open and a closed position hundreds of times per day. In operation, a latch is kept in a latch eye to keep the excavator shovel in the closed position, while the excavator may move to a dumping location, whereupon, to dump material from the excavator shovel, the latch is withdrawn from the latch eye so as to release the shovel to the open position. [003] To keep the shovel closed, the latch is extended into a keeping position, such that the latch is extended by a biasing force or gravity into the latch eye. The biasing force is overcome by an actuator to withdraw the latch from the latch eye to open the shovel. [004] Latches are not only actuated hundreds of times per day, they are also disposed in a floor of the excavator shovel, which is a high impact, high wear zone, such that they wear rapidly from repeated shovel impacts and bulk material repeatedly flowing into and out of the shovel. [005] Known latch eyes take the form of a unitary cast body. When they become worn, unitary cast bodies are repaired by first removing the cast bodies from the excavator shovel. Next, any worn regions are filled with weld material, and finally, the filled unitary cast bodies are placed back on the shovel. This process is expensive and time consuming. [006] Any reference to or discussion of any document, act or item of knowledge in this specification is included solely for the purpose of providing a context for the present invention. It is not suggested or represented that any of these matters or any combination thereof formed at the priority date part of the common general knowledge, or was known to be relevant to an attempt to solve any problem with which this specification is concerned. 1 [007] The present invention provides a new latch eye assembly for an excavator shovel. The invention also provides a new shovel including the new latch eye assembly. SUMMARY OF THE INVENTION [008] According to one aspect of the present invention there is provided a fabricated latch-end keeping eye assembly adapted to receive and keep a latch end, the fabricated latch-end keeping eye assembly including: a core body in the form of a steel plate made of a first type of steel, the core body including top and bottom surfaces, and a base core region and a head core region disposed adjacent the base region, the head core region including an aperture therethrough which is adapted to receive and keep a latch arm end, the core body configured to be mounted in a through section of a floor of the shovel; and an armour plate assembly made of a second type of steel plate, the armour plate assembly including a plurality of toughened armour plates fastened onto the head core region and base core regions of the core body, the plurality of toughened armour plates being disposed on the top surface and the bottom surface of the core body so as to sandwich the core therebetween. [009] Preferably the first type of steel is a steel having a hardness of between about 260 and 360 HB and the second type of steel steel has a surface hardness of between about 400 and 540 HB. [010] Preferably a rib of toughened armour plate is fastened onto a top surface of at least one base armour plate of a different shape to provide a stop. [011] Preferably the plurality of armour plates are disposed on opposite sides of the core plate body. [012] Preferably each one of the plurality of armour plates is fastened to the core by welding. [013] Preferably a nose armour plate is provided to inhibit wear on the nose of the head core region of the latch eye. [014] Preferably one base armour plate is provided and is in the form of a U-shaped plate, having a base and two elongate arms extending therefrom. 2 [015] The latch eye of preferred embodiments of the present invention employs a combination of different steels in order to facilitate its efficient operation in extreme conditions. [016] Advantageously, the armour plate assembly is quickly replaceable and each one of the plurality of armour plates are disposed in high wear areas so if the fabricated latch eye wears, it is not likely to require a change of the head plate body. 2a [017] Further advantageously, preferred embodiments of the latch eye assembly are designed to be of reduced weight and cost relative to cast latch eyes. This can be done by utilizing materials only where required to be utilised - such as in the rib, which can be narrower and without a ramp on either side so material usage reduced. [018] Advantageously, preferred embodiments of the present invention last longer than unitary cast latch eyes, and the armour plates are easy to replace. Armour plates and indeed the core can be thin for efficient use of materials - for example, the armour plates, which are more expensive than the core steel, can be thin so as to keep the more expensive materials to a minimum, while retaining the high wear performance desired. [019] In a further embodiment, the present invention provides a shovel for an excavator having a fabricated latch eye assembly according to the present invention. [020] According to another aspect of the present invention there is provided a shovel for an excavator, the shovel including: a core body made of a first type of steel plate, the core body including a base core region and a head core region disposed adjacent the base region, the head core region including an aperture therethrough which is adapted to receive a latch arm; and an armour plate assembly made of a second type of steel plate, the armour plate assembly including a plurality of toughened armour plates fastened onto the head core region and base core regions of the core body. [021] It is to be noted that, throughout the description and claims of this specification, the word 'comprise' and variations of the word, such as 'comprising' and 'comprises', is not intended to exclude other variants or additional components, integers or steps. Modifications and improvements to the invention will be readily apparent to those skilled in the art. Such modifications and improvements are intended to be within the scope of this invention. BRIEF DESCRIPTION OF THE DRAWINGS [022] To enable a clearer understanding the preferred embodiments of the invention will hereinafter be described with reference to the drawings and in those drawings: [023] Figure 1 is an isometric view of a floor of a shovel of an excavator, with a latch eye assembly shown disposed on the floor of the shovel; 3 [024] Figure 2 is an isometric view of a fabricated latch eye assembly of a preferred embodiment of the present invention; [025] Figure 3 is a rear elevation view of a shovel of an excavator, showing the location of a latch together with a fabricated latch eye assembly of a preferred embodiment of the present invention; [026] Figure 4 is an isometric view from above and one side of a known cast latch eye; [027] Figure 5 is an isometric underside view of the fabricated latch eye assembly shown in Figure 2; and [028] Figure 6 is a plan view from underneath of the fabricated latch eye assembly shown in Figure 2. DETAILED DESCRIPTION OF THE INVENTION [029] Referring to Figure 3 there is shown a shovel 6 of an excavator. The shovel 6 includes a door 3 which is shown in a closed position. The shovel 6 also includes a latch assembly 11 which is configured to secure the door 3 in the closed position and, when the latch assembly 11 is deactivated, allows the door to swing open (out of the page) under the force of gravity. [030] The latch assembly 11 in Figure 3 includes a drawbar 12 which has one end adapted for actuation by a power shovel operator and another end connected to a latch lever 4 which is movably disposed on the door 3. The latch lever 4 is typically coupled to a sliding latch bar 1 that is selectively engageable in a latch eye assembly 2 itself disposed on a floor 9 of the shovel 6. [031] Referring to Figure 4 there is shown a known cast latch eye 102 of the prior art. The cast latch eye 102 includes a cast unitary body 126 and further includes flanges 120 disposed at the sides of the unitary body 126. [032] The cast unitary body 126 includes a base region 125 and a head region 124. The base region 125 is generally in the form of a rectangular prism 127 extending between the flanges 120 and the head region 124 is in the form of a trapezoid 123 disposed on a top of the rectangular prism 127. A through aperture 122 extends through a middle portion of the head region 124 and is for receiving the latch bar 1. 4 [033] Various features are cast into the cast unitary body 126 including a rib 128 so as to form a ridge 129 on one side of the rectangular prism 127. The rib 128 acts as a deflector to deflect bulk material from flowing over the head portion 124 of the cast unitary body 126. [034] It can be seen that the cast unitary body 126 will wear on the rib 129, upper surface 141 and head 124. [035] Turning to the present invention, a preferred embodiment is shown in detail in Figures 2, 5 and 6, and is disposed, in use, in a shovel of an excavator which itself is depicted in Figures 1 and 3. Like numerals in the Figures denote like parts of the latch eyes, eg 2, 102. [036] Referring to Figures 2 and 3 a latch eye assembly 2 of a preferred embodiment of the present invention is adapted to be mounted in the floor region 9 of the shovel above described. [037] The latch eye assembly 2 includes a core body 7 which is made of high toughness steel having a surface hardness of 260 to 360 HB, so as to facilitate a long useful life and good mechanical resistance. The core body 7 includes a base core region 25 and a head core region 24. The base core region 25 is in the form of a rectangular prism 27 extending between core flanges 20 and the head region 24 is in the form of a trapezoid 23 disposed on a top of the rectangular prism 27. A through aperture 22 extends through a middle portion of the head region 24 and is for receiving the latch bar 1. [038] Furthermore, the latch eye assembly 2 includes an armour plate assembly 30 including a plurality of armour plates 8 being constructed from tempered steel having a surface hardness of between about 400 and 540 HB. [039] One of the plurality of armour plates 8 on the latch eye assembly is a nose plate 78. The nose plate is mounted on an upper region of the head core region 24, on a recessed portion of an upper surface. [040] One of the plurality of armour plates 8 includes an upper surface plate 58. The upper surface plate 58 is in the form of a rectangular base 55 and having two shoulder flanges 56 and 57 which extend onto an upper surface of the head core region 24 to protect much of the exposed upper surface of the core, while extending only partially onto the core flanges 20. 5 [041] One of the plurality of armour plates 8 includes a rib plate 28, which forms a ridge 29 in the form of a rectangular prism extending transversely across a middle section of the rectangular base 55 of the upper surface plate 58. The rib plate 28 is transversely positioned about the width of the head region 24 and adjacent the head region 24 since the rib plate 28 is intended to inhibit bulk material flow from the shovel over the head region 24 to reduce wear and to inhibit flow into aperture 22. [042] One of the plurality of armour plates 8 includes a base plate 48. The base plate 48 is in the form of a base 47 and two elongate arms 45, 46 extending therefrom. The base plate 48 is shaped so as to reduce cost of the relatively more expensive, hardened armour material plate 8 and to reduce wear on the head region 24 and the top portion of the body 25. [043] Each of the plates can be fastened to the core 7 by suitable fasteners including arc welding. In some embodiments other fastening such as for example recessed-head fasteners may be used. [044] A base ridge 79 is also welded onto the base of the latch eye assembly 2, constructed from the same material as the core 7. The base ridge is a triangular prism 80. In another embodiment the base ridge 79 is constructed from armour plate 8. [045] The latch eye assembly 2 includes similar features to the known latch eye 102 and indeed is an improved replacement. The latch eye assembly 2 is mounted in the shovel floor 9 and is disposed parallel with the shovel floor 9. [046] In operation, the door 3 is held in the closed position when an end of the latch bar 1 is within the aperture 22 of the head region 24 of the latch eye assembly 2. [047] The door 3 is caused to open by operating the drawbar assembly 12 which moves the latch lever 4 causing the latch bar 1 to withdraw from the aperture 22 in the latch eye assembly 2, whereby the door 3 will open under its own weight as well as the weight of material contained within the shovel 6. [048] Because of the proximity of the latch bar 1 to a fulcrum 5, the latch lever 4 provides significant mechanical leverage to slide and pull the latch bar 1, which can be under a high load. [049] The door 3 is closed by swinging the shovel 6 so as to cause the door 3 to swing towards the closed position and the end of the latch bar 1 reengages the aperture 22 of the head region 24 of the latch eye assembly 2. 6 [050] To hold the door 3 in the closed position, the latch bar 1 extends into aperture 22. [051] It will be appreciated by persons skilled in the art that numerous variations and/or modifications may be made to the invention as shown in the specific embodiments without departing from the spirit or scope of the invention as broadly described. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive. 7