PATENT DOCUMENT

Abstract:
A jobsite communications center including a communications module including an electrical power source, at least one speaker and at least one antenna and a toolbox-like housing for enclosing the communications module and having a handle and first and second connection assemblies, the first connection assembly enabling readily-disconnectable and reconnectable stacking interconnection of the communications center with tool boxes, the second connection assembly enabling readily-disconnectable and reconnectable mounting of the communication center on a toolbox-carrying cart in a manner similar to connection of toolboxes thereto.

Full Description:
REFERENCE TO RELATED PATENTS 
       [0001]    Reference is hereby made to U.S. Pat. No. 8,567,796, entitled Rolling Container Assembly with Adjustable Storage Units, the description of which is hereby incorporated by reference. 
         [0002]    This application is a continuation-in-part of U.S. patent application Ser. No. 14/480,113, entitled “ROLLING CONTAINER ASSEMBLY WITH ADJUSTABLE STORAGE UNITS” and filed Sep. 8, 2014, the contents of which are hereby incorporated by reference herein and priority of which is hereby claimed. 
     
    
     FIELD OF THE INVENTION 
       [0003]    The present invention relates generally to stackable and/or rollable storage and toolbox systems and to a job site communications center which is stackable and/or otherwise usable therewith. 
       BACKGROUND OF THE INVENTION 
       [0004]    Various types of stackable and rollable storage and toolbox systems are known. Audio play systems, commonly known as “boom boxes” are also known. 
       SUMMARY OF THE INVENTION 
       [0005]    The present invention seeks to provide an improved job site communications center which is suitable for use with stackable and/or rollable storage and/or toolbox systems and to stackable and/or rollable storage and/or toolbox systems including a job site communication center which is stackable or rollable therewith. 
         [0006]    The present invention also relates to a rugged sound system and a housing for a sound system, which are adapted for use in demanding environments, such as, for example, jobsites or building sites. Jobsite sound systems or radios are at high risk of being dropped, or of having heavy items such as tools or workpieces dropped onto them. Additionally, jobsite sound systems have to perform well in the open air and in large interior spaces. 
         [0007]    One aim of the present invention is to provide high quality sound performance in a jobsite communication center. Another aim of the present invention is to improve the overall impact resistance of a housing for a jobsite communication center while also providing high quality sound performance. It should be understood that although the invention will be described with reference to a jobsite communication center and a housing for a jobsite communication center, the sound system of the present invention and the sound system housing of the present invention may be suitable for use with or to house other devices, for example a sound system which does not include a radio receiver, or a computer system with or without speakers, or another device which it is desirable to take to a jobsite but which requires rugged protection. 
         [0008]    Another aim of an embodiment of the present invention is to integrate the jobsite sound system as an element of an integrated tool storage and transport system, such as the TSTAK® and Tough System™ tool storage and transport systems, which are currently manufactured and sold by assignee and/or its affiliates. 
         [0009]    A further aim of an embodiment of the present invention is to integrate into the jobsite sound system, which may include the features described hereinabove, a WIFI system which enables communication, via the sound system, with and between workers at various locations, who may not be in a line of sight or shouting distance of each other. Mobile devices of workers may communicate with the WIFI system among themselves as well as with entities remote from the jobsite. A foreman or team leader may employ the WIFI system to manage the work of members of a work team. 
         [0010]    An additional aim of an embodiment of the present invention is to integrate into a jobsite sound system, which may include the features described hereinabove, an Internet of Things (TOT) module, which enables remote monitoring of functioning of tools and activity of workers. Such monitoring may include, for example, proper functioning of tools, duty cycle of tool usage, tool wear and charge status. 
         [0011]    There is thus provided in accordance with a preferred embodiment of the present invention a jobsite communications center including a communications module including an electrical power source, at least one speaker and at least one antenna and a toolbox-like housing for enclosing the communications module and having a handle and first and second connection functionalities, the first connection functionality enabling readily-disconnectable and reconnectable stacking interconnection of the communications center with tool boxes, the second connection functionality enabling readily-disconnectable and reconnectable mounting of the communication center on a toolbox-carrying cart in a manner similar to connection of toolboxes thereto. 
         [0012]    There is also provided in accordance with another preferred embodiment of the present invention a jobsite communications center including a communications module including an electrical power source, at least one speaker and at least one antenna, the communications module including two-way wireless communication functionality and a housing enclosing the communications module and having a handle, the antenna being embedded in the handle. 
         [0013]    There is further provided in accordance with yet another preferred embodiment of the present invention a jobsite communications center including a communications module including an electrical power source, at least one speaker and at least one antenna, the communications module including two-way wireless communication functionality and a toolbox-like housing for enclosing the communications module and having a handle, the antenna being embedded in the housing. 
         [0014]    There is even further provided in accordance with still another preferred embodiment of the present invention a jobsite communications center including a communications module including an electrical power source, at least one speaker and at least one antenna and a housing for enclosing the communications module and having a handle, and connection elements enabling the housing to be removably attached to and transported together with toolboxes. 
         [0015]    Preferably, the housing includes a toolbox-like housing. 
         [0016]    In accordance with a preferred embodiment of the present invention the at least one antenna is located in a portion of the housing. Preferably, at least one of the at least one antenna is located in the handle. 
         [0017]    In accordance with a preferred embodiment of the present invention the first connection functionality includes a pair of manually actuable clamps for selectable attachment of the housing to a toolbox stacked thereabove. Additionally or alternatively, the second connection functionality includes a pair of bracket receiving side portions for selectable attachment of the housing to the toolbox-carrying cart. Additionally, the second connection functionality also includes a pair of resilient engagement elements operative to engage a corresponding pair of brackets forming part of the housing to the toolbox-carrying cart. 
         [0018]    In accordance with a preferred embodiment of the present invention the second connection functionality enables the jobsite communications center to be mounted onto the toolbox-carrying cart interchangeably with a toolbox. Additionally or alternatively, the second connection functionality enables the jobsite communications center to be mounted onto the toolbox-carrying cart in additional to at least one toolbox. 
         [0019]    Preferably, the first connection functionality includes a pair of connection elements for selectable attachment of the housing to a toolbox stacked therebelow, which toolbox has a pair of manually actuable latches for connecting to the connection elements. 
         [0020]    In accordance with a preferred embodiment of the present invention the communications module includes a radio receiver. Additionally or alternatively, the communications module includes a WI-FI hotspot module. Additionally or alternatively, the communications module includes a wireless router. 
         [0021]    Preferably, the communications module includes a BLUETOOTH® module. Additionally or alternatively, the communications module includes a video communication module. Additionally, the video communication module provides video communication both to and from a jobsite to a remote location. Additionally or alternatively, the video communication module provides audio-video communication both to and from a jobsite via at least one smartphone. 
         [0022]    In accordance with a preferred embodiment of the present invention the communications module includes a projector operative to project an image onto a region of a jobsite. Additionally or alternatively, the communications module includes a camera for imaging a region of a jobsite and a wireless communication module for transmitting an image from the camera to a remote location. 
         [0023]    Preferably, the communications module includes an image overlay module for overlaying an image taken at a jobsite with another image and an image comparison module for indicating differences between the image taken at a jobsite and the another image. 
         [0024]    In accordance with a preferred embodiment of the present invention the communications module includes a holographic lens module. Additionally or alternatively, the communications module includes a lighting module. Additionally, the lighting module includes at least one of ambient light and directable lighting. 
         [0025]    Preferably, the jobsite communications center also includes at least one of an oxygen source, a compressor, a welder and a dust extractor. Additionally or alternatively, the jobsite communications center also includes at least one of a refrigerated compartment and a microwave oven. 
         [0026]    In accordance with a preferred embodiment of the present invention the jobsite communications center also includes at least one of an intrusion alarm module and a tampering alarm module. Additionally, the at least one of an intrusion alarm module and a tampering alarm module has at least one of a wireless remote reporting module and a management module. 
         [0027]    Preferably, the communications module includes a visually sensible display. Additionally or alternatively, the communications module interfaces with a smart phone. 
         [0028]    In accordance with a preferred embodiment of the present invention the communications module includes a remotely controllable 360 degree camera. Preferably, the communications module includes a printer. Additionally or alternatively, the communications module includes an augmented-reality module. 
         [0029]    In accordance with a preferred embodiment of the present invention the communications module includes an intercom module. Additionally, the intercom module is operative to enable intercom communications among multiple smartphones via the communications module. 
         [0030]    Preferably, the communications module includes a 3D printer to enable on-site fabrication of elements based on data received via the communications module. Additionally or alternatively, the communications module includes a 3D scanner. 
         [0031]    In accordance with a preferred embodiment of the present invention the communications module includes a tool tracking module. Additionally or alternatively, the communications module includes a tool use monitoring module. 
         [0032]    Preferably, the communications module includes a tool wear monitoring module. Additionally or alternatively, the communications module includes a tool battery charge state tracking module. 
         [0033]    In accordance with a preferred embodiment of the present invention the communications module includes an environmental hazard sensing module. Additionally, the environmental hazard sensing module includes sensors for at least one of fire, smoke, dangerous chemicals, biohazards, weather hazards and earthquakes. 
         [0034]    Preferably, the communication module includes at least one sensor interface. 
         [0035]    In accordance with a preferred embodiment of the present invention the jobsite communications center also including a wireless battery charging module. Preferably, the communication module includes a calendar module including an active reminder module. 
         [0036]    In accordance with a preferred embodiment of the present invention the at least one speaker is wirelessly connected to the jobsite communication center. Additionally or alternatively, the communication module includes a message transmission module. 
         [0037]    Preferably, the communication module includes a wireless remote communicator enabling it to communicate with a wireless remote communicator in another jobsite communication center located remotely therefrom. Additionally or alternatively, the communication module includes a communicator enabling it to communicate with and via the cloud. 
         [0038]    In accordance with a preferred embodiment of the present invention the housing includes a main shell and at least one side panel, and the at least one side panel partially overlaps an area of the main shell and each of the at least one side panel includes a plate and at least one bumper, the plate being relatively rigid and the bumper being relatively resilient, and the plate is connected to the main shell in the area of overlap and the bumper protrudes beyond one or more planar surfaces of the housing. Additionally, the main shell includes a top shell and a bottom shell. Preferably, at least one of the bumpers is overmolded onto the corresponding plate. 
         [0039]    In accordance with a preferred embodiment of the present invention the overmolding process is carried out as a two step process after the molding of the plate in the same injection molding machine. Alternatively, the overmolding process is carried out as a separate process on a batch of pre-made plates in a different machine. 
         [0040]    In accordance with a preferred embodiment of the present invention the housing has six main faces in a substantially cuboid arrangement. Additionally, the at least one side panel includes two side panels, the two side panels partially overlapping areas of the main shell which are located on opposite main faces of the housing. Alternatively, the at least one side panel includes more than two side panels. 
         [0041]    In accordance with a preferred embodiment of the present invention the at least one side panel is connected to the main shell via the plate. 
         [0042]    In accordance with a preferred embodiment of the present invention the plate is connected to the main shell in the area of overlap by one or more screws, each screw passing through a screw hole in the plate. Preferably, the screw holes in the plate are each provided with a resilient gasket. Additionally, the resilient gaskets are overmolded onto the corresponding plate. Preferably, the resilient gaskets are overmolded in the same molding shot as the resilient bumper on the same plate. 
         [0043]    In accordance with a preferred embodiment of the present invention each side panel includes one bumper. Alternatively, at least one of the at least one side panels includes two or more separate bumpers. Additionally, the two or more separate bumpers may be provided at different positions. 
         [0044]    Preferably, the handle is attached to the main shell, and the handle includes a recess adapted to contain the at least one antenna. 
         [0045]    In accordance with a preferred embodiment of the present invention the housing includes an enclosure adapted to contain the at least one antenna, the enclosure being located between one of the one or more plates and the main shell in the area of overlap. 
         [0046]    In accordance with a preferred embodiment of the present invention the housing provides accommodation for a sound system including at least one sound input means, up to six speakers and means for powering the speakers and the housing also includes cover means for each speaker located therein. Additionally or alternatively, the housing is integratable into a storage system by means of adaptation to be stackable or adaptation to be supported on a storage rack. Additionally, the sound input means is a radio receiver. 
         [0047]    Preferably, the housing includes one or more latches, one or more latch receiving structures, and one or more rack attachment structures. In accordance with a preferred embodiment of the present invention the jobsite communications center includes a rear attachment point for securing to a rack. 
         [0048]    In accordance with a preferred embodiment of the present invention the jobsite communications center also includes sound system electronics located within the housing and WIFI electronics coupled to the sound system electronics and located within the housing. Additionally, the jobsite communications center also includes Internet of Things (JOT) electronics for communication with IOT components of tools via the WIFI electronics. Additionally or alternatively, the WIFI electronics enables communication with a monitoring site remote from the sound system. 
         [0049]    In accordance with a preferred embodiment of the present invention the housing includes a sound system including at least six speakers housed therein, at least one of the at least six speakers is an active subwoofer and at least one of the at least six speakers is a passive subwoofer. 
         [0050]    Preferably, the housing includes a top face, a bottom face opposite to the top face and at least one side face, the housing having a central axis passing through the centre point of the top face and the centre point of the bottom face. Additionally, a central axis of the active subwoofer and a central axis of the passive subwoofer are parallel to each other. Additionally, both the active subwoofer and the passive subwoofer face the bottom surface of the housing and the central axis of the active subwoofer and the passive subwoofer are parallel to the central axis of the housing. 
         [0051]    In accordance with a preferred embodiment of the present invention the subwoofers face downwards. 
         [0052]    Preferably, the jobsite communications center is supported on a surface. Additionally, the surface is a floor surface. Alternatively, the jobsite communications center is suspended above a floor surface by support means. 
         [0053]    In accordance with a preferred embodiment of the present invention a speaker cover is attached to the outside of the housing, the speaker cover including a first convex region facing the housing, the first convex region having a central axis collinear with the central axis of the active subwoofer, and a second convex region facing the housing, the second convex region having a central axis collinear with the central axis of the passive subwoofer, the speaker cover further including at least one grill region. 
         [0054]    In accordance with a preferred embodiment of the present invention at least four of the at least six speakers include tweeter units. Preferably, four of the at least six speakers are tweeter units. Additionally or alternatively, each of the tweeter units are located near the top face of the housing. Additionally or alternatively, each of the tweeter units are adjacent to the top face of the housing. 
         [0055]    Preferably, the central axis of each tweeter unit is at a diverging angle to the central axis of the housing. It is appreciated that this arrangement may help to project sound from the speaker units evenly over a wide area, to improve overall sound distribution. 
         [0056]    In accordance with a preferred embodiment of the present invention the housing includes at least one external handle suitable for carrying the sound system, the at least one external handle being located on one of the at least one side faces of the housing. Additionally or alternatively, the housing includes connection means to permit the housing to be mounted onto a rack or dolly. 
         [0057]    Preferably, the housing includes a range of attachment points for support means. Additionally, the support means are wall-mounted. Alternatively, the support means are portable. 
         [0058]    In accordance with a preferred embodiment of the present invention the housing includes a portable housing. 
         [0059]    In accordance with a preferred embodiment of the present invention the jobsite communications center also includes a cover assembly including a pair of latch assemblies. Additionally, each of the latch assemblies includes two slidable latch elements and a spring urging the latch elements towards a locked orientation. Additionally or alternatively, the cover assembly includes a water-resistant seal, the water-resistant seal acting as a spring to urge the cover assembly into an open orientation when it is unlatched. 
         [0060]    There is also provided in accordance with another preferred embodiment of the present invention a toolbox system including at least one toolbox having a footprint and a jobsite communications center having a footprint at least similar to the footprint of the at least one toolbox, the at least one toolbox and the jobsite communication center having mutual attachment elements enabling the jobsite communications center and the at least one toolbox to be removably attached to each other and transported together. 
         [0061]    There is yet further provided in accordance with still another preferred embodiment of the present invention a toolbox system including a toolbox cart, at least one toolbox having a footprint and a jobsite communications center having a footprint at least similar to the footprint of the at least one toolbox, the toolbox cart, the at least one toolbox and the jobsite communication center having mutual attachment elements enabling the jobsite communications center and the at least one toolbox to be removably attached to the cart and transported together. 
         [0062]    Preferably, the jobsite communications center includes a housing, the housing including a main shell and at least one side panel, the at least one side panel partially overlapping an area of the main shell, each of the at least one side panels including a plate and at least one bumper, the plate being relatively rigid and the bumper being relatively resilient and the plate is connected to the main shell in the area of overlap and the bumper protrudes beyond one or more planar surfaces of the housing. Preferably, at least one of the bumpers is overmolded onto the corresponding plate. 
         [0063]    In accordance with a preferred embodiment of the present invention the housing has six main faces in a substantially cuboid arrangement. Additionally, the at least one side panel includes two side panels, the two side panels partially overlapping areas of the main shell which are located on opposite main faces of the housing. Alternatively, the at least one side panel includes more than two side panels. 
         [0064]    In accordance with a preferred embodiment of the present invention the plate is connected to the main shell in the area of overlap by one or more screws, each screw passing through a screw hole in the plate. Preferably, the screw holes in the plate are each provided with a resilient gasket. Additionally, the resilient gaskets are overmolded onto the corresponding plate. 
         [0065]    In accordance with a preferred embodiment of the present invention each side panel includes one bumper. Alternatively, at least one of the at least one side panels includes two or more separate bumpers. 
         [0066]    Preferably, the housing includes a handle attached to the main shell; and the handle includes a hollow adapted to contain at least one antenna. Additionally or alternatively, the housing includes an enclosure for at least one antenna, the enclosure being located in-between one of the one or more plates and the main shell in the area of overlap. 
         [0067]    In accordance with a preferred embodiment of the present invention the housing provides accommodation for a sound system including at least one sound input means, up to six speakers and means for powering the speakers and the housing also includes cover means for each speaker located therein. Additionally or alternatively, the housing is integratable into a storage system by means of adaptation to be stackable or adaptation to be supported on a storage rack. 
         [0068]    Preferably, the housing includes one or more latches, one or more latch receiving structures, and one or more rack attachment structures. In accordance with a preferred embodiment of the present invention the jobsite communications center includes a rear attachment point for securing to a rack. 
         [0069]    In accordance with a preferred embodiment of the present invention the toolbox system also includes sound system electronics located within the housing and WIFI electronics coupled to the sound system electronics and located within the housing. Additionally, the toolbox system also includes Internet Of Things (IOT) electronics for communication with IOT components of tools via the WIFI electronics. Additionally or alternatively, the WIFI electronics enables communication with a monitoring site remote from the sound system. 
         [0070]    In accordance with a preferred embodiment of the present invention the housing includes a sound system including at least six speakers housed therein, at least one of the at least six speakers is an active subwoofer and at least one of the at least six speakers is a passive subwoofer. 
         [0071]    Preferably, the housing includes a top face, a bottom face opposite to the top face and at least one side face, the housing having a central axis passing through the centre point of the top face and the centre point of the bottom face. Additionally, a central axis of the active subwoofer and a central axis of the passive subwoofer are parallel to each other. Additionally, both the active subwoofer and the passive subwoofer face the bottom surface of the housing and the central axis of the active subwoofer and the passive subwoofer are parallel to the central axis of the housing. 
         [0072]    In accordance with a preferred embodiment of the present invention a speaker cover is attached to the outside of the housing, the speaker cover including a first convex region facing the housing, the first convex region having a central axis collinear with the central axis of the active subwoofer, and a second convex region facing the housing, the second convex region having a central axis collinear with the central axis of the passive subwoofer, the speaker cover further including at least one grill region. 
         [0073]    In accordance with a preferred embodiment of the present invention at least four of the at least six speakers include tweeter units. Preferably, four of the at least six speakers are tweeter units. Additionally or alternatively, each of the tweeter units are located near the top face of the housing. Additionally or alternatively, each of the tweeter units are adjacent to the top face of the housing. 
         [0074]    Preferably, the central axis of each tweeter unit is at a diverging angle to the central axis of the housing. 
         [0075]    In accordance with a preferred embodiment of the present invention the housing includes at least one external handle suitable for carrying the sound system, the at least one external handle being located on one of the at least one side faces of the housing. Additionally or alternatively, the housing includes connection means to permit the housing to be mounted onto a rack. 
         [0076]    In accordance with a preferred embodiment of the present invention the housing includes a portable housing. 
         [0077]    In accordance with a preferred embodiment of the present invention the jobsite communications center includes a cover assembly including a pair of latch assemblies. Additionally, each of the latch assemblies includes two slidable latch elements and a spring urging the latch elements towards a locked orientation. Additionally or alternatively, the cover assembly includes a water-resistant seal, the water-resistant seal acting as a spring to urge the cover assembly into an open orientation when it is unlatched. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0078]    The present invention will be understood and appreciated more fully from the following detailed description, taken in conjunction with the drawings in which: 
           [0079]      FIGS. 1A, 1B, 1C, 1D, 1E, 1F, 1G and 1H  are respective simplified front/top view pictorial; back/top view pictorial, front/bottom view pictorial, back/bottom view pictorial, top planar view, bottom planar view, right side planar view and left side planar view illustrations of a job site communications center constructed and operative in accordance with a preferred embodiment of the present invention; 
           [0080]      FIG. 2  is a simplified exploded view illustration of the job site communications center of  FIGS. 1A-1H ; 
           [0081]      FIGS. 3A, 3B, 3C, 3D, 3E, 3F, 3G and 3H  are respective simplified front/top view pictorial; back/top view pictorial, front/bottom view pictorial, back/bottom view pictorial, top planar view, bottom planar view, right side planar view and left side planar view illustrations of a main assembly, forming part of the communications center of  FIGS. 1A-2 ; 
           [0082]      FIG. 4  is a simplified exploded view illustration of the main assembly of  FIGS. 3A-3H ; 
           [0083]      FIGS. 5A, 5B, 5C, 5D, 5E, 5F, 5G and 5H  are respective simplified front/top view pictorial; back/top view pictorial, front/bottom view pictorial, back/bottom view pictorial, top planar view, bottom planar view, right side planar view and left side planar view illustrations of a main assembly housing element, forming part of the main assembly of  FIGS. 3A-4 ; 
           [0084]      FIGS. 6A, 6B, 6C, 6D, 6E, 6F, 6G and 6H  are respective simplified front/top view pictorial; back/top view pictorial, front/bottom view pictorial, back/bottom view pictorial, top planar view, bottom planar view, right side planar view and left side planar view illustrations of a base element, forming part of the job site communications center of  FIGS. 1A-2 ; 
           [0085]      FIGS. 7A, 7B, 7C, 7D, 7E, 7F, 7G and 7H  are respective simplified front/top view pictorial; back/top view pictorial, front/bottom view pictorial, back/bottom view pictorial, top planar view, bottom planar view, right side planar view and left side planar view illustrations of a bottom element, forming part of the job site communications center of  FIGS. 1A-2 ; 
           [0086]      FIGS. 8A, 8B, 8C, 8D, 8E, 8F, 8G and 8H  are respective simplified front/top view pictorial; back/top view pictorial, front/bottom view pictorial, back/bottom view pictorial, top planar view, bottom planar view, right side planar view and left side planar view illustrations of a right side bracket engaging element, forming part of the job site communications center of  FIGS. 1A-2 ; 
           [0087]      FIGS. 9A, 9B, 9C, 9D, 9E, 9F, 9G and 9H  are respective simplified front/top view pictorial; back/top view pictorial, front/bottom view pictorial, back/bottom view pictorial, top planar view, bottom planar view, right side planar view and left side planar view illustrations of a right side bumper, forming part of the job site communications center of  FIGS. 1A-2 ; 
           [0088]      FIGS. 10A, 10B, 10C, 10D, 10E, 10F, 10G and 10H  are respective simplified front/top view pictorial; back/top view pictorial, front/bottom view pictorial, back/bottom view pictorial, top planar view, bottom planar view, right side planar view and left side planar view illustrations of a left side bracket engaging element, forming part of the job site communications center of  FIGS. 1A-2 ; 
           [0089]      FIGS. 11A, 11B, 11C, 11D, 11E, 11F, 11G and 11H  are respective simplified front/top view pictorial; back/top view pictorial, front/bottom view pictorial, back/bottom view pictorial, top planar view, bottom planar view, right side planar view and left side planar view illustrations of a left side bumper, forming part of the job site communications center of  FIGS. 1A-2 ; 
           [0090]      FIGS. 12A, 12B, 12C, 12D, 12E, 12F, 12G and 12H  are respective simplified front/top view pictorial; back/top view pictorial, front/bottom view pictorial, back/bottom view pictorial, top planar view, bottom planar view, right side planar view and left side planar view illustrations of a latchable pivotable top cover assembly, forming part of the job site communications center of  FIGS. 1A-2 ; 
           [0091]      FIGS. 13A, 13B, 13C, 13D, 13E, 13F, 13G and 13H  are respective simplified front/top view pictorial; back/top view pictorial, front/bottom view pictorial, back/bottom view pictorial, top planar view, bottom planar view, right side planar view and left side planar view exploded view illustrations of the latchable pivotable top cover assembly of  FIGS. 12A-12H ; 
           [0092]      FIGS. 14A, 14B, 14C, 14D, 14E, 14F, 14G and 14H  are respective simplified front/top view pictorial; back/top view pictorial, front/bottom view pictorial, back/bottom view pictorial, top planar view, bottom planar view, right side planar view and left side planar view illustrations of a battery charging receptacle, forming part of the job site communications center of  FIGS. 1A-2 ; 
           [0093]      FIGS. 15A, 15B, 15C, 15D, 15E, 15F, 15G and 15H  are respective simplified front/top view pictorial; back/top view pictorial, front/bottom view pictorial, back/bottom view pictorial, top planar view, bottom planar view, right side planar view and left side planar view illustrations of a latchable, pivotable battery charging receptacle cover, forming part of the job site communications center of  FIGS. 1A-2 ; 
           [0094]      FIGS. 16A, 16B, 16C, 16D, 16E, 16F, 16G, 16H and 161  are respective simplified front/top view pictorial; back/top view pictorial, front/bottom view pictorial, back/bottom view pictorial, top planar view, bottom planar view, right side planar view, left side planar view and sectional illustrations of a handle and antenna assembly, forming part of the job site communications center of  FIGS. 1A-2 ,  FIG. 16I  being taken along lines I-I in  FIG. 16H ; 
           [0095]      FIGS. 17A, 17B, 17C and 17D  are respective simplified front/top view pictorial; side-facing sectional, rearward-facing sectional and top planar view illustrations of the latchable pivotable top cover assembly of  FIGS. 12A-12H  in a cover-raised operative orientation,  FIGS. 17B and 17C  being taken along lines B-B and C-C in  FIG. 17D ; 
           [0096]      FIGS. 18A, 18B, 18C and 18D  are respective simplified front/top view pictorial; side-facing sectional, rearward-facing sectional and top planar view illustrations of the latchable pivotable top cover assembly of  FIGS. 12A-12H  in a cover partially-lowered, unlatched operative orientation,  FIGS. 18B and 18C  being taken along lines B-B and C-C in  FIG. 18D ; 
           [0097]      FIGS. 19A, 19B, 19C and 19D  are respective simplified front/top view pictorial; side-facing sectional, rearward-facing sectional and top planar view illustrations of the latchable pivotable top cover assembly of  FIGS. 12A-12H  in a cover-lowered, latched operative orientation,  FIGS. 19B and 19C  being taken along lines B-B and C-C in  FIG. 19D ; 
           [0098]      FIGS. 20A, 20B, 20C and 20D  are respective simplified front/top view pictorial; side-facing sectional, rearward-facing sectional and top planar view illustrations of the latchable pivotable top cover assembly of  FIGS. 12A-12H  in a cover-lowered, unlatched operative orientation,  FIGS. 20B and 20C  being taken along lines B-B and C-C in  FIG. 20D ; 
           [0099]      FIGS. 21A, 21B, 21C and 21D  are simplified pictorial illustrations illustrating stages in mounting of the job site communications center of  FIGS. 1A-20D  onto a rollable container carrier; 
           [0100]      FIGS. 22A and 22B  are simplified pictorial illustrations illustrating stages in stackable and lockable mounting of the job site communications center of  FIGS. 1A-20D  onto a tool box in accordance with one embodiment of the present invention; 
           [0101]      FIGS. 23A, 23B and 23C  are simplified pictorial illustrations illustrating stages in stackable and lockable mounting of a tool box onto the job site communications center of  FIGS. 1A-20D  in accordance with one embodiment of the present invention; 
           [0102]      FIGS. 24A and 24B  are simplified pictorial illustrations illustrating stages in stackable and lockable mounting of a job site communications center onto a tool box in accordance with another embodiment of the present invention; 
           [0103]      FIGS. 25A, 25B and 25C  are simplified pictorial illustrations illustrating stages in stackable and lockable mounting of a tool box onto a job site communications center in accordance with another embodiment of the present invention; 
           [0104]      FIGS. 26A and 26B  are simplified sectional illustrations of the flow of sound from two sub-woofers and out through grills in the job site communications center in accordance with one embodiment of the present invention, taken along lines XXVIA-XXVIA and XXVIB-XXVIB in  FIG. 1E , respectively; 
           [0105]      FIG. 27  is a simplified block diagram illustrating various selectable features of the job site communications center of any of  FIGS. 1A-39 ; 
           [0106]      FIG. 28  is a simplified pictorial illustration of the operation of the communication center of any of  FIGS. 1A-26B  in a calendar reminder mode of operation; 
           [0107]      FIG. 29  is a simplified pictorial illustration of the operation of the communication center of any of  FIGS. 1A-26B  in a WIFI hotspot mode of operation; 
           [0108]      FIG. 30  is a simplified pictorial illustration of the operation of the communication center of any of  FIGS. 1A-26B  in an intercom mode of operation; 
           [0109]      FIG. 31  is a simplified pictorial illustration of the operation of the communication center of any of  FIGS. 1A-26B  in a tool monitoring mode of operation; 
           [0110]      FIG. 32  is a simplified pictorial illustration of the operation of the communication center of any of  FIGS. 1A-26B  in a wireless recharging mode of operation; 
           [0111]      FIG. 33  is a simplified pictorial illustration of the operation of the communication center of any of  FIGS. 1A-26B  in a two-way video communication mode of operation; 
           [0112]      FIG. 34  is a simplified pictorial illustration of the operation of the communication center of any of  FIGS. 1A-26B  in a video projection mode of operation; 
           [0113]      FIG. 35  is a simplified pictorial illustration of the operation of the communication center of any of  FIGS. 1A-26B  in a 3D printing mode of operation; 
           [0114]      FIG. 36  is a simplified pictorial illustration of the operation of the communication center of any of  FIGS. 1A-26B  in a hazard sensing mode of operation; 
           [0115]      FIG. 37  is a simplified pictorial illustration of the operation of the communication center of any of  FIGS. 1A-26B  in an illumination mode of operation; 
           [0116]      FIG. 38  is a simplified pictorial illustration of the operation of the communication center of any of  FIGS. 1A-26B  in an alarm mode of operation; and 
           [0117]      FIG. 39  is a simplified pictorial illustration of the operation of the communication center of any of  FIGS. 1A-26B  in a mode of communication between communication centers. 
       
    
    
     DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS 
       [0118]    Reference is now made to  FIGS. 1A, 1B, 1C, 1D, 1E, 1F, 1G and 1H , which are respective simplified front/top view pictorial; back/top view pictorial, front/bottom view pictorial, back/bottom view pictorial, top planar view, bottom planar view, right side planar view and left side planar view illustrations of a job site communications center constructed and operative in accordance with a preferred embodiment of the present invention, and to  FIG. 2 , which is a simplified exploded view illustration of the job site communications center of  FIGS. 1A-1H . 
         [0119]    As seen in  FIGS. 1A-2 , the job site communications center of a preferred embodiment of the present invention includes a top shell, such as a main assembly  100 , a bottom shell, such as a base element  110 , and a bottom cover, such as a bottom element  120 . The job site communications center also preferably includes respective right and left side panels, each side panel including a plate, such as right and left side bracket engaging elements  122  and  124 , which are mounted onto respective right and left sides of the main assembly  100 , in the sense of  FIG. 1A , and a bumper, such as a right side bumper  126  and a left side bumper  128 , which are mounted over the peripheral edges of respective right side bracket engaging element  122  and left side bracket engaging element  124 . 
         [0120]    The right and left side panels are preferably attached to main assembly  100  with multiple screws onto side sections thereof. The side sections of the main assembly  100  may be reinforced compared to the other regions thereof, for example, by one or more ribs perpendicular to the external surface. Main assembly  100  preferably includes a grid of ribs perpendicular to the external surface, to provide a region which is resistant to deformation or crushing if the region is subjected to sudden impacts or heavy loading. 
         [0121]    The top shell, bottom shell and bottom cover are made from any suitable rigid material, preferably plastic, such as ABS. Right side bumper  126  and left side bumper  128  are preferably formed of a resilient, impact-absorbing, material, such as an elastomer or rubber. The top shell, bottom shell and bottom cover are preferably formed by injection molding, and right side bumper  126  and left side bumper  128  are preferably formed of a thermoplastic elastomer to allow them to be formed on and attached to right and left side bracket engaging elements  122  and  124  in an overmolding process. It is appreciated that fire resistant materials may be used for some or all parts of the job site communications center. 
         [0122]    A sound system of the job site communication center preferably includes an active sub-woofer  130  and a passive sub-woofer  132 , which are preferably mounted onto base element  110  and are protected from below by bottom element  120 . A battery charging assembly  134  is also preferably mounted onto base element  110 . A back mounting bracket  136  is mounted onto main assembly  100 . 
         [0123]    Reference is now made to  FIGS. 3A, 3B, 3C, 3D, 3E, 3F, 3G and 3H , which are respective simplified front/top view pictorial; back/top view pictorial, front/bottom view pictorial, back/bottom view pictorial, top planar view, bottom planar view, right side planar view and left side planar view illustrations of main assembly  100 , forming part of the communications center of  FIGS. 1A-2 , and to  FIG. 4 , which is a simplified exploded view illustration of the main assembly  100  of  FIGS. 3A-3H . 
         [0124]    As seen in  FIGS. 3A-4 , the main assembly  100  preferably comprises a main assembly housing element  150 , a user interface and electronics subassembly  160 , a latchable pivotable top cover assembly  170  and an antenna and handle assembly  180  including an antenna  181 . The sound system of the job site communication center preferably also includes four speakers, preferably waterproof, such as tweeters  182 , which are mounted onto main assembly housing element  150  and are protected by corresponding tweeter covers  184 , which are also mounted onto main assembly housing element  150 . A side antenna  186  is preferably mounted onto a side of main assembly housing element  150 . Main assembly  100  also preferably includes a pivotably mounted battery charging assembly cover element  188 . 
         [0125]    It is appreciated that the number of speakers and placement thereof may differ from that shown, for example, there may be a larger or smaller number of small speakers near the top, and there may be only one sub-woofer cone. For example, there may be two, three, five or six small speakers, or there may be a total of two small, two medium-sized and one or two large speakers. 
         [0126]    It is further appreciated that main assembly housing element  150  is preferably waterproofed to avoid damage to the job site communication center due to rain or other fluid contacting the housing element  150 . The speakers may have waterproof cones and all of the housing compartments, including each speaker compartment, may be individually sealed with rubber seals. User interface and electronics subassembly  160  provides a user interface for operation of the sound system. Preferably, user interface and electronics subassembly  160  is waterproofed to prevent water damage. 
         [0127]    A pair of latch assemblies  190  are mounted on latch assembly mounting surfaces  192  on right and left sides of main assembly housing element  150 . Latch assemblies  190  are preferably known latch assemblies employed in the known TOUGH SYSTEM™ tool box carrier, commercially available under the DEWALT® brand from the Stanley Black &amp; Decker. 
         [0128]    Reference is now made to  FIGS. 5A, 5B, 5C, 5D, 5E, 5F, 5G and 5H , which are respective simplified front/top view pictorial; back/top view pictorial, front/bottom view pictorial, back/bottom view pictorial, top planar view, bottom planar view, right side planar view and left side planar view illustrations of main assembly housing element  150 , forming part of the main assembly  100  of  FIGS. 3A-4 . 
         [0129]    As seen in  FIGS. 5A-5H , main assembly housing element  150  preferably comprises an integral element preferably formed of plastic by injection molding. The main assembly housing element  150  is generally rectangular and preferably includes at a front and top facing portion thereof, in the sense of  FIG. 5A , a control panel portion  200  for receiving user interface and electronics subassembly  160  ( FIG. 4 ) and including a socket  202  for a flat panel display (not shown), a main button socket  204  and various push button sockets  206  on both sides thereof. Disposed on opposite sides of the control panel portion  200  are tweeter housing portions  208 , each having a socket  210  for receiving and mounting of a tweeter  182  and a frame  212  for receiving and mounting of a tweeter cover  184 . 
         [0130]    The main assembly housing element  150  also preferably includes at a top and rear facing portion thereof, in the sense of  FIG. 5A , a battery charger assembly receiving portion  220  for receiving and mounting of battery charging assembly  134  ( FIGS. 1A-2H ) and a frame  222  for receiving battery charger assembly cover portion  188  ( FIG. 4 ). Battery charging assembly cover element  188  ( FIG. 4 ) is pivotably and sealably mounted over battery charger assembly receiving portion  220 . Preferably, two latch recesses  224  are provided in main housing element  150  for engagement with battery charging assembly cover element  188 . 
         [0131]    The main assembly housing element  150  also preferably includes, at a top facing portion thereof, in the sense of  FIG. 5A , a pair of side-by-side enclosures  230 , which are both selectably accessible via latchable pivotable top cover assembly  170  ( FIG. 4 ), which preferably provides a water-tight seal for enclosures  230  via a peripheral sealing rib  232  formed on main assembly housing element  150 . Rearwardly of enclosures  230  there are provided a plurality of mutually axially spaced intermediate hinge elements  234 . Forwardly of enclosures  230 , there are preferably provided recesses  236  for retaining latch assemblies. 
         [0132]    Enclosures  230  preferably include a storage cavity  238 , which can be used to store an AC power adaptor, provided with the job site communications center, when the adaptor is not in use, and a media compartment  239 , including one or more of a media device charging socket and an auxiliary input socket for the media device to interface with the sound system. Storage cavity  238  may also store various other elements useful in embodiments of the invention described hereinbelow with reference to  FIGS. 27-39 . 
         [0133]    Extending outwardly and downwardly from each of side portions of main assembly housing element  150 , in the sense of  FIG. 5A , is a latch engagement portion  240 , which preferably comprises a pair of side supports  242 , each extending outwardly from a lower side portion of main assembly housing element  150 , which are joined by an elongate portion  244  having formed therein a plurality of side by side separated latch engagement apertures  246 . 
         [0134]    Formed on a forward-facing surface of main assembly housing element  150  are a pair of mutually spaced intermediate handle attachment sockets  248  and formed on respective side-facing surfaces of main assembly housing element  150  are a pair of end handle attachment sockets  250 , at least one of which includes an antenna connection socket  252 . 
         [0135]    Reference is now made to  FIGS. 6A, 6B, 6C, 6D, 6E, 6F, 6G and 6H , which are respective simplified front/top view pictorial; back/top view pictorial, front/bottom view pictorial, back/bottom view pictorial, top planar view, bottom planar view, right side planar view and left side planar view illustrations of base element  110 , forming part of the job site communications center of  FIGS. 1A-2 . 
         [0136]    As seen in  FIGS. 6A-6H , the base element  110  comprises a generally planar top surface  300 , preferably having a grid of reinforcing elements and a centrally disposed, rearward recess  302  for accommodating battery charging assembly  134  ( FIG. 2 ). Disposed on opposite sides of recess  302  are a socket  304  for accommodating active sub-woofer  130  ( FIG. 2 ) and a socket  306  for accommodating passive sub-woofer  132  ( FIG. 2 ). 
         [0137]    Depending from generally planar top surface  300  at the sides of base element  110 , there are provided depending side portions  310 , each of which is preferably provided with a bifurcated latch mounting portion  312 . 
         [0138]    On the underside of base element  110  at a forward facing portion thereof there is provided a generally planar bottom surface  314  having a plurality of screw attachment protrusions  316 . Underlying each of side portions  310  there are provided a pair of leg portions  318  and a generally planar screw attachment portion  320 . 
         [0139]    Reference is now made to  FIGS. 7A, 7B, 7C, 7D, 7E, 7F, 7G and 7H , which are respective simplified front/top view pictorial; back/top view pictorial, front/bottom view pictorial, back/bottom view pictorial, top planar view, bottom planar view, right side planar view and left side planar view illustrations of bottom element  120 , forming part of the job site communications center of  FIGS. 1A-2 . 
         [0140]    As seen in  FIGS. 7A-7H , bottom element  120  includes a generally planar top facing surface  350 , having formed therein a pair of slightly convex (in the sense of  FIG. 2 ) round domes  352  and  354 , arranged to generally underlie sub-woofers  130  and  132 , respectively. Bottom element  120  also includes an upwardly-inclined, forward facing grill  356  and a bifurcated upwardly-inclined rearward facing grill  358 . 
         [0141]    It is appreciated that domes  352  and  354  redirect the sound output from sub-woofers  130  and  132  through forward facing grill  356  and rearward facing grill  358 . 
         [0142]    During use, the job site communications center may be supported on a surface, and the redirection of the sub-woofer output towards the front and back thereof prevents the sound quality being impaired or affected by the surface onto which the job site communications center is supported. 
         [0143]    Reference is now made to  FIGS. 8A, 8B, 8C, 8D, 8E, 8F, 8G and 8H , which are respective simplified front/top view pictorial; back/top view pictorial, front/bottom view pictorial, back/bottom view pictorial, top planar view, bottom planar view, right side planar view and left side planar view illustrations of right side bracket engaging element  122 , forming part of the job site communications center of  FIGS. 1A-2 . 
         [0144]    As seen in  FIGS. 8A-8H , right side bracket engaging element  122  preferably comprises a unitary element, preferably formed of plastic, and includes a generally flat surface  360  for receiving a mounting bracket of a rollable container carrier, preferably a wheeled tool box carrier, such as a TOUGH SYSTEM™ tool box carrier, commercially available under the DEWALT® brand from Stanley Black &amp; Decker. Surrounding surface  360  is a partially peripheral bumper mounting protrusion  362  having a closed forward-facing end  364  and an open rearward-facing end  366 . Protrusion  362  includes a top central recess  368  and a bottom central recess  370 . Respective inner facing walls  372  and  374  of recesses  368  and  370  help define, together with generally flat surface  360 , a bracket insertion guide path for enabling ready mounting and dismounting of the job site communications center of  FIGS. 1A-2  onto mounting brackets of the wheeled tool box carrier, as is described hereinbelow with reference to  FIGS. 21A-21D . 
         [0145]    Reference is now made to  FIGS. 9A, 9B, 9C, 9D, 9E, 9F, 9G and 9H , which are respective simplified front/top view pictorial; back/top view pictorial, front/bottom view pictorial, back/bottom view pictorial, top planar view, bottom planar view, right side planar view and left side planar view illustrations of right side bumper  126 , forming part of the job site communications center of  FIGS. 1A-2 . 
         [0146]    As seen in  FIGS. 9A-9H , right side bumper  126  preferably comprises a unitary element, preferably formed of a resilient, impact-absorbing, material, such as an elastomer or rubber, and includes a cut-out generally flat mounting surface  380  which serves for mounting the bumper  126  onto the right side of the main assembly housing element  150  and in protective relationship on the outside of right side bracket engaging element  122 . 
         [0147]    In the illustrated embodiment, mounting surface  380  is preferably retained between a right end of the main assembly housing element  150  and an inner facing surface of right side bracket engaging element  122 , while a resilient, shock absorbing, partial peripheral bumper protrusion  382 , integrally formed with mounting surface  380 , is mounted onto partially peripheral bumper mounting protrusion  362  of right side bracket engaging element  122  and protrudes outwardly to the right, as well as to the top, bottom, front and rear thereof, thereby providing impact protection for the job site communications center of  FIGS. 1A-2  at the right end thereof. It is seen that partially peripheral bumper protrusion  382  has a closed forward-facing end  384  mounted over closed forward-facing end  364  of partially peripheral bumper mounting protrusion  362  of right side bracket engaging element  122  and an open rearward-facing end  386 , mounted over open rearward-facing end  366  of partially peripheral bumper mounting protrusion  362  of right side bracket engaging element  122 . 
         [0148]    It is a particular feature of bumper  126  that there is provided a resilient downwardly extending curved engagement lip  388  at a lower surface  390  of an upper portion  392  of partially peripheral bumper protrusion  382  adjacent open rearward facing end  386 . 
         [0149]    Reference is now made to  FIGS. 10A, 10B, 10C, 10D, 10E, 10F, 10G and 10H , which are respective simplified front/top view pictorial; back/top view pictorial, front/bottom view pictorial, back/bottom view pictorial, top planar view, bottom planar view, right side planar view and left side planar view illustrations of left side bracket engaging element  124 , forming part of the job site communications center of  FIGS. 1A-2 . Left side bracket engaging element  124  is preferably a mirror image of right side bracket engaging element  122  and is otherwise identical thereto. 
         [0150]    Accordingly, as seen in  FIGS. 10A-10H , left side bracket engaging element  124  preferably comprises a unitary element, preferably formed of plastic, and includes a generally flat surface  460  for receiving a mounting bracket of a rollable container carrier, preferably a wheeled tool box carrier, such as a TOUGH SYSTEM™ tool box carrier, commercially available under the DEWALT® brand from Stanley Black &amp; Decker. Surrounding surface  460  is a partially peripheral bumper mounting protrusion  462  having a closed forward-facing end  464  and an open rearward-facing end  466 . Protrusion  462  includes a top central recess  468  and a bottom central recess  470 . Respective inner facing walls  472  and  474  of recesses  468  and  470  help define, together with generally flat surface  460 , a bracket insertion guide path for enabling ready mounting and dismounting of the job site communications center of  FIGS. 1A-2  onto mounting brackets of the wheeled tool box carrier, as is described hereinbelow with reference to  FIGS. 21A-21D . 
         [0151]    Reference is now made to  FIGS. 11A, 11B, 11C, 11D, 11E, 11F, 11G and 11H , which are respective simplified front/top view pictorial; back/top view pictorial, front/bottom view pictorial, back/bottom view pictorial, top planar view, bottom planar view, right side planar view and left side planar view illustrations of left side bumper  128 , forming part of the job site communications center of  FIGS. 1A-2 . Left side bumper  128  is preferably a mirror image of right side bumper  126  and is otherwise identical thereto. 
         [0152]    Accordingly, as seen in  FIGS. 11A-11H , left side bumper  128  preferably comprises a unitary element, preferably formed of a resilient, impact-absorbing, material, such as an elastomer or rubber, and includes a cut-out generally flat mounting surface  480  which serves for mounting the bumper  128  onto the left side of the main assembly housing element  150  and in protective relationship on the outside of left side bracket engaging element  124 . 
         [0153]    In the illustrated embodiment, mounting surface  480  is preferably retained between a left end of the main assembly housing element  150  and an inner facing surface of left side bracket engaging element  124 , while a resilient, shock absorbing, partial peripheral bumper protrusion  482 , integrally formed with mounting surface  480 , is mounted onto partially peripheral bumper mounting protrusion  462  of left side bracket engaging element  124  and protrudes outwardly to the left, as well as to the top, bottom front and rear thereof, thereby providing impact protection for the job site communications center of  FIGS. 1A-2  at the left end thereof. It is seen that partially peripheral bumper protrusion  482  has a closed forward-facing end  484  mounted over closed forward-facing end  464  of partially peripheral bumper mounting protrusion  462  of left side bracket engaging element  124  and an open rearward-facing end  486 , mounted over open rearward-facing end  466  of partially peripheral bumper mounting protrusion  462  of left side bracket engaging element  124 . 
         [0154]    It is a particular feature of bumper  128  that there is provided a resilient downwardly extending curved engagement lip  488  at a lower surface  490  of an upper portion  492  of partially peripheral bumper protrusion  482  adjacent open rearward facing end  486 . 
         [0155]    It is appreciated that right side bumper  126  and left side bumper  128  protrude from the edges of the right side bracket engaging element  122  and left side bracket engaging element  124 , respectively, and when the right and left side panels are attached to the main assembly  100 , bumpers  126  and  128  protrude beyond the main surfaces of main assembly  100 . Bumpers  126  and  128  may have cavities defined by partially peripheral bumper protrusion  382  as shown in  FIGS. 9A-9H and 11A-11H , or alternatively the bumper may be partially hollow or may be a solid piece of resilient material. If the jobsite communications center is dropped or heavy equipment is dropped onto it, bumpers  126  and  128  act to absorb shocks and prevent the main structure from being damaged or crushed. 
         [0156]    A corner impact will deform bumper  126  or  128  extending therefrom. Some of the force from the impact will be dissipated by deformation of the resilient bumper  126  or  128  and some will be transferred to the bracket engaging element  122  or  124  to which bumper  126  or  128  is attached. As shown in  FIGS. 8A-8H and 10A-10H , bracket engaging elements  122  and  124  each have a number of screw holes with which bracket engaging elements  122  and  124  can be attached to main assembly  100 . These screw holes can be provided with resilient gaskets. Such gaskets can allow any impact forces to be dissipated without damaging main assembly  100  and bracket engaging elements  122  and  124  where they are in contact with the screws. 
         [0157]    In the embodiment shown in the figures, bracket engaging elements  122  and  124  hold the job site communications center together. Base element  110  is preferably connected to main assembly  100  using screws. A left and a right side panel are then attached to the left and right sides of the main assembly  100 , respectively. Bracket engaging elements  122  and  124  are not attached to base element  110  by screws, but an edge of the bracket engaging elements  122  and  124  overlaps base element  110 , which ensures that base element  110  is held tightly in position by even if the screws connecting base element  110  to main assembly  100  were removed or any connecting parts were snapped. 
         [0158]    Alternatively, bracket engaging elements  122  and  124  may be attached to base element  110  as well as to main assembly  100  using screws, or the job site communications center may have a different arrangement. Preferably, all of the screw connections between bracket engaging elements  122  and  124  and the job site communications center are provided with resilient gaskets. 
         [0159]    The edges of the job site communications center which are not directly protected by bumpers  126  and  128  are chamfered, in order to reduce the likelihood of an impact crushing part of an edge, since the chamfered edges do not protrude as far as the edges would otherwise. The tweeter covers  184  also have a central molded divot to improve crush-resistance. Tweeter covers  184  may also be slightly set back from the main surfaces of the job site communications center, as shown in  FIGS. 1A-1H and 3A-3H , which may make them less vulnerable to impacts and main assembly  100  may also be slightly shaped to provide extra acoustic amplification and direction. 
         [0160]    Reference is now made to  FIGS. 12A, 12B, 12C, 12D, 12E, 12F, 12G and 12H , which are respective simplified front/top view pictorial; back/top view pictorial, front/bottom view pictorial, back/bottom view pictorial, top planar view, bottom planar view, right side planar view and left side planar view illustrations of latchable pivotable top cover assembly  170 , forming part of the job site communications center of  FIGS. 1A-2 , and to  FIGS. 13A, 13B, 13C, 13D, 13E, 13F, 13G and 13H , which are respective simplified front/top view pictorial; back/top view pictorial, front/bottom view pictorial, back/bottom view pictorial, top planar view, bottom planar view, right side planar view and left side planar view simplified exploded view illustrations of the latchable pivotable top cover assembly of  FIGS. 12A-12H . Reference is also made to  FIGS. 17A-20D , which illustrate various stages in the closing, latching and unlatching of the top cover. 
         [0161]    As seen in  FIGS. 12A-13H , the latchable pivotable top cover assembly  170  preferably comprises a generally planar cover portion  500  having a generally rectangular shape, defining a central forward facing cut out  502 . At a forward-facing edge of cover portion  500 , in the sense of  FIG. 12A , there are preferably provided two pairs of mutually spaced, depending latch fingers  504 , each having a forward facing tooth  506 . 
         [0162]    At a rearward-facing edge of cover portion  500 , in the sense of  FIG. 12A , there are preferably provided a pair of corner hinge elements  508  and a pair of mutually spaced intermediate hinge elements  510 , all mutually axially spaced from each other and receiving a pair of coaxial pivot axles  512 , which also extend through corresponding mutually axially spaced hinge elements  234 , formed on main assembly housing element  150  ( FIGS. 5A-5H ). 
         [0163]    As seen particularly in  FIG. 13C , an underside surface of cover portion  500  is formed with a peripheral recess  520 , which accommodates a water-resistant seal  522 . Water-resistant seal  522  cooperates with peripheral sealing rib  232  ( FIGS. 5A-5H ) to provide a water-tight seal for containers  230  ( FIGS. 5A-5H ). Water-resistant seal  522  also serves as a spring, which urges the latchable pivotable top cover assembly  170  into an open orientation when it is unlatched. 
         [0164]    The latchable pivotable top cover assembly  170  preferably also comprises a pair of identical latch assemblies  530 , which are fixed to recesses  236  in main assembly housing element  150 , each of which includes a latch assembly housing  532 , a pair of finger engageable slidable latch elements  534  and a compression spring  536 , which urges the latch elements  534  towards a mutually axially separated operative orientation, as seen in  FIGS. 12A-12H . 
         [0165]    As seen particularly in  FIG. 13G , each of latch elements  534  includes a finger-engageable recessed top surface  538  and a rearwardly and downwardly-facing latch engagement shoulder  539  arranged to be lockingly engaged by a forward-facing tooth  506  of a latch engaging finger  504  of cover portion  500 . 
         [0166]    The latch assembly housings  532  are each generally rectangular and define a pair of axially spaced access windows  540  for finger engagement with latch elements  534 . As seen partially well in  FIG. 12A , the latch elements  534  are normally in mutually spaced arrangement, under the urging of springs  536 . In this arrangement, when cover portion  500  is pivoted into its fully closed position, as seen in  FIGS. 12A-12H and 19A-19D , forward-facing teeth  506  of latch engaging fingers  504  of cover portion  500  are caused to lockingly engage downwardly-facing latch engagement shoulders  539  of latch elements  534 , thereby locking the cover portion  500  in a sealed closed orientation with respect to enclosures  230  ( FIGS. 5A-5H ). This engagement can be seen particularly well in  FIGS. 12G and 12H . 
         [0167]    Unlocking of the cover portion  500  from its sealed closed orientation is achieved, as seen in  FIGS. 20A-20D , by generally simultaneous finger engagement with both latch elements  534  of each latch assembly  530 , each latch assembly  530  being engaged by a separate hand of a user, and by axial displacement of the latch elements  534  against the urgings of springs  536  towards each other, thus sliding downwardly-facing latch engagement shoulders  539  out of locking engagement with corresponding forward facing teeth  506  of latch engaging fingers  504  of cover portion  500  and allowing cover portion  500  to pivot upward about axle  512 . 
         [0168]    Reference is now made to  FIGS. 14A, 14B, 14C, 14D, 14E, 14F, 14G and 14H , which are respective simplified front/top view pictorial; back/top view pictorial, front/bottom view pictorial, back/bottom view pictorial, top planar view, bottom planar view, right side planar view and left side planar view illustrations of battery charging assembly  134 , forming part of the job site communications center of  FIGS. 1A-2  and being located in recess  220  in main assembly housing element  150  ( FIGS. 5A-5H ). 
         [0169]    As seen in  FIGS. 14A-14F , the battery charging assembly  134  is formed define a battery receiving socket  550  configured to receive a rechargeable battery pack (not shown) and having a plurality of electrical connection pins  552  at a base  554  of socket  550 . 
         [0170]    Reference is now made to  FIGS. 15A, 15B, 15C, 15D, 15E, 15F, 15G and 15H , which are respective simplified front/top view pictorial; back/top view pictorial, front/bottom view pictorial, back/bottom view pictorial, top planar view, bottom planar view, right side planar view and left side planar view illustrations of latchable, pivotable battery charging receptacle cover  188  ( FIG. 4 ), forming part of the job site communications center of  FIGS. 1A-2 . 
         [0171]    As seen in  FIGS. 15A-15H , at a rearward-facing edge of cover  188 , in the sense of  FIG. 15A , there are preferably provided a pair of mutually spaced hinge elements  560 , and receiving pivot axles  512 , which also extend through corresponding mutually axially spaced hinge elements  234  formed on main assembly housing element  150  ( FIGS. 5A-5H ). It is thus appreciated that both the cover  188  and the cover assembly  170  pivot about the same axis, preferably about coaxial axles  512 . 
         [0172]    Cover  188  also preferably includes a pair of slidable, spring loaded side latch assemblies  562 , which selectably engage latch recesses  224  formed on frame  222 . 
         [0173]    Reference is now made to  FIGS. 16A, 16B, 16C, 16D, 16E, 16F, 16G, 16H and 161 , which are respective simplified front/top view pictorial; back/top view pictorial, front/bottom view pictorial, back/bottom view pictorial, top planar view, bottom planar view, right side planar view, left side planar view and sectional illustrations of handle and antenna assembly  180 , forming part of the job site communications center of  FIGS. 1A-2 ,  FIG. 16I  being taken along lines I-I in  FIG. 16H . 
         [0174]    As seem in  FIG. 16A , the handle and antenna assembly  180  includes a generally hollow handle element  580  defining a pair of end attachment protrusions  582 , each of which fits into a corresponding socket formed on a forward-facing surface of main assembly housing element  150 , and a pair of intermediate attachment protrusions  584 , each of which fits into a corresponding socket formed on a forward-facing surface of main assembly housing element  150 . A hand grip portion  586  is preferably molded over a central portion of generally hollow handle element  580 . 
         [0175]    Antenna  181  ( FIG. 4 ) preferably extends through a hollow portion  588  of handle element  580  and also extends through an antenna connection passageway  590  into antenna connection socket  252  of the main assembly housing element  150 . 
         [0176]    It is appreciated that the job site communications center may include additional handles. Additionally, generally hollow handle element  580  may form a hollow front bumper bar, which further protects the front of the job site communications center, including speakers, grills and any nearby elements of the user interface from frontal impacts, while minimizing weight of the jobsite communications center and material required. Alternatively, an additional solid front bumper bar may be provided. 
         [0177]    It is appreciated that all connections for antenna  181  are contained within main assembly  100 , and the user cannot access or adjust antenna  181 . As seen in  FIG. 4 , antenna  186  may also be provided at a side of main assembly  100 , positioned inside a channel in main assembly  100  between ribs of a reinforced side section thereof, such that antenna  186  is covered by the side panel when it is attached to the main assembly  100 . These arrangements provide increased protection for antennas  181  and  186  and the connections thereof to the sound system, which improves the durability of the sound system. 
         [0178]    It is appreciated that job site communications center may include various radio receivers, for example, FM, AM, DAB and other versions of digital radio broadcast. Additionally, the sound system of job site communications center may include Bluetooth® capabilities and may have one or more auxiliary inputs, in order to allow media from other devices to be played through the sound system. The sound system may have one or more user accessible compartments within the main shell, which can be sealed in order to protect devices contained in the compartments. The device interface ports can be provided within the compartments, and USB chargers to recharge mobile telephones or other devices may also be provided within the compartments. Thereby, the whole assembly of the sound system, mobile telephone or other device, and linking cables, can be protected from water or dust ingress and from impacts, and the whole assembly can also easily be moved to another work location with a minimum of disturbance of the assembly. 
         [0179]    The job site communications center may be operated by a battery, or may be plugged into a power supply using a transformer supplied with the job site communications center. When plugged in, the job site communications center may be arranged to recharge the battery. Advantageously, the sound system of job site communications center may be powered by batteries intended for use with power tools, which will typically be available on a jobsite, and which can provide suitable power for the application and are convenient to use when the job site communications center is not close to a source of mains power. 
         [0180]    Reference is now made to  FIGS. 21A, 21B and 21C , which are simplified pictorial illustrations illustrating stages in stackable and lockable mounting of a tool box onto the job site center of  FIGS. 1A-20D  in accordance with one embodiment of the present invention. 
         [0181]      FIG. 21A  shows initial partial sliding engagement of the job site communications center of  FIGS. 1A-20D  with the right one of a pair of known mounting brackets  600  of a known TOUGH SYSTEM™ tool box carrier  602 , commercially available under the DEWALT® brand from the Stanley Black &amp; Decker. The enlargement shows a known socket  604  forming part of each of brackets  600  which surrounds a screw head  606 , also forming part of each of brackets  600 . The enlargement also shows resilient downwardly extending curved engagement lip  388  ( FIG. 9D ) at a lower surface  390  of an upper portion  392  of partially peripheral bumper protrusion  382  adjacent open rearward facing end  386 . At this stage engagement lip  388  does not engage socket  604 . 
         [0182]      FIG. 21B  shows further partial sliding engagement of the job site communications center of  FIGS. 1A-20D  with the right one of a pair of known mounting brackets  600  of the known TOUGH SYSTEM™ tool box carrier. The enlargement shows resilient downwardly extending curved engagement lip  388  ( FIG. 9D ) approaching socket  604  of bracket  600  which surrounds screw head  606 . At this stage engagement lip  388  does not yet engage socket  604 . 
         [0183]      FIG. 21C  shows full retained engagement of the job site communications center of  FIGS. 1A-20D  with the right one of a pair of known mounting brackets  600  of the known TOUGH SYSTEM™ tool box carrier. Enlargement A shows resilient downwardly extending curved engagement lip  388  ( FIG. 9D ) engaging socket  604  of bracket  600  and partially surrounding screw head  606 . This engagement retains but does not lock the job site communications center of  FIGS. 1A-20D  onto the TOUGH SYSTEM™ tool box carrier  602 . Enlargement B shows a rotatable locking element  610  of the TOUGH SYSTEM™ tool box carrier  602  out of locking engagement with back mounting bracket  136  ( FIGS. 1A-2 ) of the job site communications center  100 . 
         [0184]      FIG. 21D  shows full locked engagement of the job site communications center of  FIGS. 1A-20D  with the right one of a pair of known mounting brackets  600  of the known TOUGH SYSTEM™ tool box carrier  602 . As seen in Enlargement A of  FIG. 21C , resilient downwardly extending curved engagement lip  388  ( FIG. 9D ) engages socket  604  of bracket  600  and partially surrounding screw head  606 . This engagement retains but does not lock the job site communications center of  FIGS. 1A-20D  onto the TOUGH SYSTEM™ tool box carrier  602 . The enlargement shown in  FIG. 21D  shows rotatable locking element  610  of the TOUGH SYSTEM™ tool box carrier  602  in locking engagement with back mounting bracket  136  ( FIGS. 1A-2 ) of the job site communications center  100 . A padlock (not shown) may be inserted into an aperture  612  of rotatable locking element  610  for preventing unauthorized unlocking and removal of the job site communications center from the tool box carrier  602 . 
         [0185]    Reference is now made to  FIGS. 22A and 22B , which are simplified pictorial illustrations illustrating stages in stackable and lockable mounting of the job site communications center of  FIGS. 1A-20D  onto a tool box in accordance with one embodiment of the present invention. 
         [0186]      FIG. 22A  shows a job site communications center as shown in  FIGS. 1-20D , herein designated by reference number  615 , located above a conventional tool box  620 , forming part of the TOUGH SYSTEM™, wherein latches  622  of the conventional tool box are in an open operative orientation. 
         [0187]      FIG. 22B  shows the job site communications center  615  stacked and latched onto and above conventional tool box  620 , forming part of the TOUGH SYSTEM®, wherein latches  622  of the conventional tool box are in latching engagement with latch engagement portion  240  ( FIGS. 5A-5H ) of the job site communications center  615 . 
         [0188]    Reference is now made to  FIGS. 23A, 23B and 23C , which are simplified pictorial illustrations illustrating stages in stackable and lockable mounting of a tool box onto the job site communications center of  FIGS. 1A-20D  in accordance with one embodiment of the present invention. 
         [0189]      FIG. 23A  shows the job site communications center  615 , wherein latch assemblies  190  ( FIGS. 1A-5H ) of the job site communications center  615  are in an open operative orientation. 
         [0190]      FIG. 23B  shows a conventional tool box  620 , forming part of the TOUGH SYSTEM™, about to be stacked onto the job site communications center  615 , wherein latch assemblies  190  ( FIGS. 1A-5H ) of the job site communications center  615  are in an open operative orientation. 
         [0191]      FIG. 23C  shows the conventional tool box  620  stacked and latched onto and above job site communications center  615  wherein latch assemblies  190  of the job site communications center  615  are in latching engagement with corresponding latch engagement portion  624  ( FIG. 23B ) of the conventional tool box  620 . 
         [0192]    Reference is now made to  FIGS. 24A and 24B , which are simplified pictorial illustrations illustrating stages in stackable and lockable mounting of another job site communications center onto a tool box in accordance with another embodiment of the present invention. 
         [0193]      FIG. 24A  shows a job site communications center  630 , having at least some of the functionality of the job site communication center of  FIGS. 1A-20D , located above a conventional tool box  632 , forming part of the TSTAK® SYSTEM, wherein latches  634  of the conventional tool box  632  are in an open operative orientation. 
         [0194]      FIG. 24B  shows the job site communications center  630  stacked and latched onto and above conventional tool box  632 , wherein latches  634  of the conventional tool box  632  are in latching engagement with latch engagement portions  636  ( FIG. 24A ) of the job site communications center  630 , which may be similar to latch engagement portions  240  ( FIGS. 5A-5H ) of the job site communications center shown in  FIGS. 1A-20D . 
         [0195]    Reference is now made to  FIGS. 25A, 25B and 25C , which are simplified pictorial illustrations illustrating stages in stackable and lockable mounting of a known tool box  632  onto the job site communications center  630  in accordance with one embodiment of the present invention. 
         [0196]      FIG. 25A  shows the job site communications center  630 , wherein latch assemblies  640 , which may be similar to latch assemblies  190  ( FIGS. 1A-5H ) of the job site communications center  100 , are in an open operative orientation. 
         [0197]      FIG. 25B  shows a conventional tool box  632  about to be stacked onto the job site communications center  630 , wherein latch assemblies  640  of the job site communications center  630  are in an open operative orientation. 
         [0198]      FIG. 25C  shows the conventional tool box  632  stacked and latched onto and above job site communications center  630  wherein latch assemblies  640  of the job site communications center  630  are in latching engagement with corresponding latch engagement portion  636  of the conventional tool box  632 . 
         [0199]    It is appreciated that the jobsite communications center of  FIGS. 1A-161  may be used in a standalone mode, such as, for example on a floor or other flat support surface. Alternatively, it can be placed on a stationary rack or a movable rack, such as seen in  FIGS. 21A-21D . The side panels of  FIGS. 8A-11H  include rack attachment structures in the form of a slot that is horizontal when the jobsite communications center is in normal use, shaped to be slidably engageable with horizontal bracket arms of a storage rack system or dolly of the appropriate width. The outer face of respective right and left side bracket engaging elements  122  and  124  is flat and respective right and left side bumpers  126  and  128  extend linearly horizontally and have a gap at the rear such that the jobsite communications center may be slid and rested onto a bracket arm at that point. Parts of the resilient bumpers  126  and  128  may be in contact with the bracket arms, in order to increase the friction holding the sound system onto the bracket arms when the dolly is moved. In particular, there may be one or more dimples in one part which engage with corresponding raised portions of the other part, wherein preferably the dimples are provided on the resilient bumpers  126  and  128  and the raised portions are provided on the bracket arms. As shown in  FIG. 2 , back mounting bracket  136  may be provided at the rear of the jobsite communications center, which may be used to lock the radio onto the rack or dolly to hold it securely, as seen in  FIG. 21D . 
         [0200]    Alternatively, the jobsite communications center  FIGS. 1A-161  may be placed in a stack with other items, such as, for example, as seen in  FIGS. 22A-23C , DEWALT® Tough System™ storage boxes, or anything else of a suitable size and shape. Latch assemblies  190  ( FIG. 4 ) may, for example, be used to latch onto a case or second job site communications center placed on top of the first job communications center, and latch engagement portion  240  ( FIGS. 5A-5H ) may accept latches from a case or second job site communications center placed below. It is appreciated that the number and location of latch assemblies  190  and latch engagement portion  240  may vary. 
         [0201]    It is appreciated that for any jobsite sound system, the highest risk of being dropped is when it is being carried across a jobsite from a van or car to get to the worksite, or when it is being carried between two worksites. A worker typically has to take a number of tools or items to each worksite, and may carry these in one or more toolboxes. A worker will typically carry as many items together as possible, in order to minimize the number of trips between positions before starting work. This can result in a jobsite sound system being carried while being balanced on top of another item, which increases the risk of being dropped. Thus, the integration of a jobsite sound system into a storage system, as seen in  FIGS. 21A-25C , where it is latched onto a toolbox so both are carried together, or where it is latched into a movable storage rack, reduces the overall risk of damage to the jobsite sound system and makes it easier for the user to move items between locations on the jobsite. 
         [0202]    Reference is now made to  FIGS. 26A and 26B , which are simplified sectional illustrations of the flow of sound from sub-woofers  132  and  130 , respectively, and out through grills in the job site communications center in accordance with one embodiment of the present invention, taken along lines XXVIA-XXVIA and XXVIB-XXVIB in  FIG. 1E , respectively. 
         [0203]    As indicated by the arrows in  FIGS. 26A and 26B , sound from respective sub-woofers  132  and  130  ( FIG. 2 ) passes over bottom element  120  and more specifically over generally planar top facing surface  350 , having formed therein a pair of slightly convex (in the sense of  FIG. 2 ) round domes  354  and  352 , arranged to generally underlie sub-woofers  132  and  130 , respectively, and out through upwardly-inclined, forward facing grill  356  and a bifurcated upwardly-inclined rearward facing grill  358 .  FIG. 26B  also shows the sound from tweeters  182 . 
         [0204]    Reference is now made to  FIG. 27 , which is a simplified block diagram illustrating various selectable features of the job site communications center of any of  FIGS. 1A-26B . As seen in  FIG. 27 , the job site communications center of any of  FIGS. 1A-26B , preferably includes a central processor  700 , which forms part of the user interface and electronics subassembly  160  ( FIGS. 1A-2 ). Central processor  700  is preferably powered by a power supply  702  which may receive mains power or have an external or internal battery (not shown). A user interface  704 , such as a radio control panel, and preferably including a multi-functional user interface control may be wirelessly coupled to the central processor  700  or hard wired thereto. 
         [0205]    The central processor  700 , preferably associated with a memory  706 , preferably controls and powers the operation of one and preferably more than one and most preferably all of the following modules, some of which are described hereinbelow with reference to  FIGS. 28-39 : 
         [0206]    A battery charging module  710 , employing battery charging assembly  134  ( FIG. 2 ); 
         [0207]    An internet communications module  720 , such as a WIFI hot-spot; 
         [0208]    A Bluetooth® communications module  730 ; 
         [0209]    A hazard sensing module  740 , which may sense hazards, such as noxious gases, excessive temperature and earthquakes; 
         [0210]    An intercom module  750  which may employ smartphones or alternatively dedicated intercom units; 
         [0211]    A one-way or two-way video communications module  760 , which may employ the internet communications module  720  and/or the Bluetooth communications module; 
         [0212]    A tampering alarm module  770 ; 
         [0213]    A tool monitoring module  780 , which may monitor tool wear, overheating, battery status and duty cycle; 
         [0214]    A wireless recharging module  790  for wirelessly recharging tool batteries; 
         [0215]    A video projection module  800  for projecting received video images onto a job site surface; 
         [0216]    An illumination module  820  for providing ambient and directed illumination at a job site; 
         [0217]    A 3D printing module  830  and 
         [0218]    A communication module  840  between multiple disparately located job site communication centers. 
         [0219]    Reference is now made to  FIG. 28 , which is a simplified pictorial illustration of the operation of the communication center of any of  FIGS. 1A-27  in a calendar reminder mode of operation. As seen in  FIG. 28 , the internet communications module  720  ( FIG. 27 ) of the job site communications center  100  of any of  FIGS. 1A-27  preferably includes a reminder module. Reminders may be sent to various persons in communication with the communication center in various ways, such as via smartphones  920 , tablets  922  or intercom units  924 . The reminders may be stored at the job site in memory  706 , forming part of the job site communications center and associated with processor  700  or alternatively in a memory forming part of a remote server  926 , accessible via the Internet or any other communications medium. 
         [0220]    Reference is now made to  FIG. 29 , which is a simplified pictorial illustration of the operation of the communication center of any of  FIGS. 1A-26B  in a WIFI hotspot mode of operation. As seen in  FIG. 29 , the internet communications module  720  ( FIG. 27 ) of the job site communications center  100  of any of  FIG. 1A  preferably provides broadband internet communications via the internet for computers  930 , smartphones  932 , tablets  936  and any other devices having an Internet of Things (TOT) module at the job site. 
         [0221]    Reference is now made to  FIG. 30 , which is a simplified pictorial illustration of the operation of the job site communication center of any of  FIGS. 1A-27  in an intercom mode of operation employing intercom module  730  ( FIG. 27 ). As seen in  FIG. 30 , intercom module  730  enables point to point and multipoint communications between people at the job site via smartphones  940  and/or intercom specific communicators  942 . 
         [0222]    Reference is now made to  FIG. 31 , which is a simplified pictorial illustration of the operation of the job site communications center of any of  FIGS. 1A-27  in a tool monitoring mode of operation employing tool monitoring module  780 . Tool monitoring module  780  may be employed with various tools, such as drills and saws and any other devices having an Internet of Things (TOT) module  946 , at the job site. Tool monitoring module  780  may monitor various tool parameters, such as duty cycle, hours of operation, tool wear, cutting implement wear and removal of tools from the propinquity of the job site communications center and may employ TOT modules  946  embedded in or attached to various tools. 
         [0223]    Reference is now made to  FIG. 32 , which is a simplified pictorial illustration of the operation of the communication center of any of  FIGS. 1A-27  in a wireless recharging mode of operation, employing wireless recharging module  790  ( FIG. 27 ). The wireless recharging may be based on induction or on any other available technology and may employ a known inductive charger  948 . 
         [0224]    Reference is now made to  FIG. 33 , which is a simplified pictorial illustration of the operation of the communication center of any of  FIGS. 1A-27  in a one way or two-way video communication mode of operation, employing one-way or two-way video communications module  760  ( FIG. 27 ). This module may employ internet communications module  720  and/or Bluetooth communications module  730  and enables still or moving images  950  from the job site to be communicated via a job site camera  951 , or a camera module forming part of jobsite communications center, to remotely-located users and also enables still or moving images  952  from a remote location to be viewed at a job site, such as on display  953 . In the illustrated embodiment shown in  FIG. 33 , images  950  of a structure under construction taken with job site camera  951  are transmitted to a remote location, where a user is able to annotate them and provided annotated images  952  to workers at the job site for viewing on display  953 . 
         [0225]    Reference is now made to  FIG. 34 , which is a simplified pictorial illustration of the operation of the communication center of any of  FIGS. 1A-27  in a video projection mode of operation, preferably employing video projection module  800  ( FIG. 27 ). As seen figuratively in  FIG. 34 , this enables architectural drawings to be overlaid by projection, using a conventional computer controlled projector  954  onto existing structures  956  at the job site. The projected content may be stored in memory  706  ( FIG. 27 ) of the job site communication center or received via the internet from a remote location. 
         [0226]    Reference is now made to  FIG. 35 , which is a simplified pictorial illustration of the operation of the communication center of any of  FIGS. 1A-27  in a 3D printing mode of operation, employing 3D printing module  830  ( FIG. 27 ). This module enables models and tools, such as drill bits, to be fabricated at the job site by a 3D-printer  958  from computerized instructions received from a remotely located server. 
         [0227]    Reference is now made to  FIG. 36 , which is a simplified pictorial illustration of the operation of the communication center of any of  FIGS. 1A-27  in a hazard sensing mode of operation, preferably employing hazard sensing module  740  ( FIG. 27 ). Hazard sensing module  740 , which is suitable for various types of job sites, such as in a mine, can include gas sensors  960 , such as methane sensors, carbon monoxide sensors, bio-sensors, which sense the presence of dangerous bio-organisms, vibrations, which could indicate earthquakes or other dangerous events, excessive noise or dangerous levels of illumination. The outputs of gas sensors  960  may be provided to processor  700  ( FIG. 27 ) and may trigger any suitable alarm, such as an audio alarm  962 , a visually sensible alarm  964 , a tactile alarm  966  or a combination thereof. Processor  700  ( FIG. 27 ) may also provide remote alerts, via the internet to remote sites, such as a project management site. 
         [0228]    Reference is now made to  FIG. 37 , which is a simplified pictorial illustration of the operation of the communication center of any of  FIGS. 1A-27  in an illumination mode of operation, preferably employing illumination module  820  ( FIG. 27 ). Illumination module  820 , which is suitable for various types of job sites, such as in a mine, can include various types of illuminators, such as large space illuminating lamps  970  and directable lamps  978 , including, for example LED illuminators and laser illuminators. 
         [0229]    Reference is now made to  FIG. 38 , which is a simplified pictorial illustration of the operation of the communication center of any of  FIGS. 1A-27  in a tampering alarm mode of operation, preferably employing tampering alarm module  770  ( FIG. 27 ). Tampering alarm module  770  may employ various types of sensors, such as vibration sensors  980 , case-open switch sensors  982 , propinquity sensors  984  and movement sensors  986 , which sensors may output to processor  700  ( FIG. 27 ). Processor  700  preferably provides a sensor output thresholding function to avoid false alarms and proves an output to such as an audio alarm  992  a visually sensible alarm  994 , a tactile alarm  996  or a combination thereof. Processor  700  ( FIG. 27 ) may also provide remote alerts, via the internet to remote sites, such as a project management site, indicating intrusion into a protected space in which the communication center is located or tampering with the communication center, toolboxes or tools. 
         [0230]    Reference is now made to  FIG. 39 , which is a simplified pictorial illustration of the operation of the communication center of any of  FIGS. 1A-27  in a mode of communication between communication centers, preferably employing communication module  840  ( FIG. 27 ) which enables communication between multiple disparately located job site communication centers. In this way, a network of job site communication centers  998  at disparate locations in a large job site can be effectively created and employed for coordinating activities and sharing information. 
         [0231]    It will be appreciated by persons skilled in the art that the present invention is not limited by what has been particularly claimed and includes both combinations and subcombinations of features described and shown hereinabove as well as modifications thereof which are not in the prior art.