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CROSS-REFERENCE TO RELATED APPLICATIONS 
       [0001]    This application claims priority from U.S. Provisional Patent Application No. 62/037,588 filed on Aug. 14, 2014. The entire disclosure of the prior application is considered to be part of the disclosure of the accompanying application and is hereby incorporated by reference. 
     
    
     BACKGROUND OF THE INVENTION 
       [0002]    1. Field of the Invention 
         [0003]    This invention concerns a towable apparatus on wheels for the sweeping of surfaces such as pavement and lawns; handling and transporting of materials such as waste, construction and landscaping components, earth, and the such; and the generation of electricity to supply electrically based power and landscaping tools such as saws, blowers, mowers, trimmers, drills, and the such. The apparatus includes a dust suppression system for use when sweeping; may be towed by a variety of vehicles such as gasoline powered trucks and cars, golf carts, and all-terrain vehicles (ATVs); and is adapted for use in small or confined areas. 
         [0004]    2. Description of the Related Art 
         [0005]    Maintenance workers responsible for maintaining the landscape or parking lots of homes with very large yards, churches, business parks, schools, city governments and other small to medium size facilities have a need for a multipurpose apparatus to transport tools, equipment, waste, trash, soil, fertilizers, construction materials, and such; sweep pathways, sidewalks, lawns, and parking lots of debris; and provide a source of electrical power in remote locations. These needs must be satisfied while keeping the apparatus small enough so that it may be easily maneuvered, lightweight so that it may be towed by maintenance carts or ATVs, and sufficiently silent so that it may be used about schools and business complexes without disturbing individuals. Currently a variety of specialized apparatus exists. 
         [0006]    One such apparatus is the street sweeper as disclosed in multiple US patents. These vehicles typically have four wheels and carries a main broom of cylindrical configuration which is located under the vehicle&#39;s carriage. The main broom extends across the width of the vehicle, and is powered so that it rotates to lift any debris present on the pavement being swept into the vehicle itself for disposal in an appropriate location at some subsequent time. The typical street sweeping vehicle also includes a pair of side brooms, known in the trade as gutter brooms, which are designed to gather material from the sides of the vehicle and propel it inwardly so that it comes under the control of the main broom and is lifted into the vehicle and disposed of. Although a street sweeper may cover large areas of pavement such as the parking lots of schools and business parks in a short amount of time they are expensive to purchase and maintain. In addition street sweepers are not designed to sweep sidewalks and paved pathways. The street sweeper is too specialize of an apparatus for maintenance workers to take with them to a job site. Maintenance workers are also in need of an apparatus that may store equipment or materials for easy transport or disposal. 
         [0007]    A number of specialized apparatuses for the easy transport of equipment or materials are disclosed as patents or in other publications. US Patent Publication 2005/0253445 titled “Self Propelled Trailer” discloses an embodiment of a towable trailer that may satisfy the aforementioned needs of maintenance workers. The Self Propelled Trailer contains a hopper with closed sides and a tailgate that may be used to store the materials that are to be transported or disposed of. The hopper is also mounted on a lift mechanism so that one end of the hopper may be raised into such a position so that any material contained within may, by simple gravitational forces, slide out of the hopper onto the ground. The Self Propelled Trailer, being also towable, may be easily transported from one job site to another and once at a job site the Self Propelled Trailer makes use of a small motor, gas or electrical, to allow a maintenance worker to maneuver the trailer to a position that may not otherwise be accessible to the vehicle towing the trailer. The motor also functions for tilting the hopper to such a height so that materials within the hopper may easily fall onto the ground. The use of a motor powered by a battery would make the Self Propelled Trailer “green” in that noise and air pollution are reduced or eliminated when maneuvering the trailer Although the Self Propelled Trailer facilitates the transport of landscape equipment, power tools, and materials within a job site it does not have the ability to sweep lawns, paved pathways, or parking lots of unwanted debris. The addition of a motor for maneuvering purposes does provide a benefit in that the Self Propelled Trailer may be moved from one location to another within a job site. However the size of the motor and the design of the steering mechanism makes this movement a slow and deliberate process thereby decreasing the effectiveness of the maintenance workers as they are not able to react to maintenance opportunities that present themselves about the job site. Furthermore the motor is dedicated to the operations of the Self Propelled Trailer requiring maintenance workers to carry with them a bulky and expensive power generator when operating electrically based power equipment. Finally the hopper, when disposing of any materials contained therein, may only dispose of the material on the ground requiring the maintenance worker to then lift the material into a dumpster. The Self Propelled Trailer is too specialize of an apparatus for maintenance workers to take with them to a job site. 
         [0008]    Maintenance workers are in need of a versatile apparatus that may be towed from job site to job site by a vehicle and within a job site by a maintenance cart or ATV. The apparatus must be able to act as a mobile sweeper to clean smaller parking lots found at schools and parks as well as sweeping pathways, lawns, and sidewalks to remove litter, debris, and plant waste. The apparatus must have a hopper to collect material both swept by the broom from the area below the apparatus as well as allowing material to be deposited into the hopper by maintenance workers from above the apparatus. The hopper must be designed so as to allow any material contained within the hopper to be deposited onto the ground or into a dumpster. Finally the apparatus must be designed so that the power source used to operate the broom and the hopper lift mechanism may be concurrently used by maintenance workers to supply electrical energy needed to operate any electrically based power tools. 
         [0009]    Known apparatuses do not meet all of the aforementioned needs required by maintenance workers whose responsibilities include the care and maintenance of parking lots, sidewalks, pathways, lawns, and other related landscaping needs at city parks, schools, business parks, golf courses and ranges, and office complexes. 
       BRIEF SUMMARY OF THE INVENTION 
       [0010]    The present invention to be disclosed herein is for a trailer that is battery powered and of such a weight that it may be towed by either a traditional gas powered vehicle, maintenance cart, or ATV. The trailer contains a main broom for sweeping the ground beneath as well as a gutter broom for moving debris from alongside the trailer so that the debris is subsequently brushed up by the main broom into the hopper. The hopper has both a lower and upper opening. The lower opening allows for debris swept up by the main broom to enter the hopper while the upper opening allows for maintenance workers to deposit a variety of material within the hopper for transport. The material may range from waste material such as litter, debris, plant trimmings, and unwanted soil to desired materials such as fertilizers, treated soils, construction goods, plants, and tools. The hopper is of such a design so that when tilted to dispose of material contained within the hopper, the material may be deposited into a structure enclosed by walls such as a dumpster or directly onto the ground itself. Finally the power source used to operate the brooms and lift the hopper may also be used to supply the electrical requirements of any electrically driven power tools such as blowers, trimmers, circular saws, and the such. 
         [0011]    The trailer of the present invention is of such a size and weight that it may be towed by virtually any street vehicle with a hitch from one job site to another. Once on a job site it may be towed from one area of the job site to another by a maintenance cart or ATV. The trailer of the present invention is of such a width that it may be easily maneuvered through narrow gates and passage areas. 
         [0012]    The main broom of the trailer of the present invention may be adjusted both in the speed of rotation and its distance from the surface of the ground below the trailer. The main broom may be adjusted to such a height that would be proper when towing the trailer from one work area to another. The main broom may also be adjusted to such a height and with such a rotational speed so that when the trailer is passed over delicate lawn areas leaves and other small lightweight debris may be picked up without damage to the lawn. The main broom may also be adjusted to such a height and with such a rotational speed so that when the trailer is passed over harder surfaces such as pavement or pathways larger debris such as rocks and other discarded items may be picked up. Furthermore the height and rotation speed may be varied at any point so as to provide the appropriate amount of force when cleaning a surface. Like the main broom, the gutter broom is also fully adjustable in terms of rotational speed and height from the surface to provide similar sweeping abilities as does the main broom. Additionally just as the main broom may be raised to a stowed position when not in use likewise the gutter broom may be raised to a stowed when not in use. 
         [0013]    The hopper of the trailer of the present invention contains two entrances that may be opened or closed independently of each other. One entrance allows material picked up by the main broom to enter the hopper and is located where the main broom meets the hopper. This entrance, or the entire hopper itself, may be embellished by a dust suppression system to reduce the amount of dust that may be expelled into the atmosphere by the action of the main broom. The second entrance is the top of the hopper and allows a maintenance worker to load the hopper with material that is to be transported elsewhere and deposited. Moreover the hopper is of such geometric shape and hinged to the trailer&#39;s frame in such a manner so that when tilted any material contained within the hopper may be deposited directly onto the ground or into a structure surrounded by walls such as a dumpster that is commonly found in city parks, schools, business parks, golf courses and ranges, and office complexes. The hopper is also lifted by an electrical actuator to such an angle so as to facilitate the removal of any material contained within the hopper. 
         [0014]    Finally the trailer of the present invention is environmentally friendly as it is powered by batteries. When operating as a sweeper the trailer is extremely quiet. This allows the trailer to sweep parking lots and pathways in noise sensitive areas such as schools and office complexes without disturbing the work being performed by students and employees. During breaks the trailer may be parked close to a power outlet for charging as the trailer contains the necessary electronics to convert alternating current (AC) power to direct current (DC) power to replenish the power stored within the batteries. Additionally the trailer is equipped with a DC to AC power converter so that the batteries may be used to power any of the many electrically based power tools and equipment currently available on the market. By using electrically based power tools maintenance workers may perform their duties with fewer disturbances to those about them than if they were to use gasoline based equipment. By having an AC power outlet maintenance workers may use the batteries within the trailer to charge batteries used with small power tools such as drills and saws or to power the tools themselves. 
         [0015]    Further areas of applicability of the present invention will become apparent from the detailed description provided hereinafter. It should be understood that the detailed description and specific examples, while indicating the preferred embodiment of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention. 
     
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         [0016]    The present invention will become more fully understood from the detailed description and accompanying drawings, wherein: 
           [0017]      FIG. 1  shows a front left perspective view of the trailer of the present invention with the hopper being covered and the gutter broom in it deployed position. 
           [0018]      FIG. 2  shows a front left perspective view of the trailer of the present invention with the hopper being uncovered and the gutter broom rotating in its deployed position. 
           [0019]      FIG. 3  shows a front left perspective view of the trailer of the present invention with the hopper being removed revealing the electronics installed in the trailer, location of the electrical motor, and the gutter broom rotating in its deployed position. 
           [0020]      FIG. 4  shows a front left perspective view of the trailer of the present invention with the hopper being uncovered and in its lifted position so that the opening in the hopper that allows debris caught by the main broom to pass into the hopper is visible as well as the gutter broom rotating in its deployed position. 
           [0021]      FIG. 5  shows a left side view of the trailer of the present invention with the hopper being in its lifted position and the gutter broom in its stowed position. 
           [0022]      FIG. 6  shows a left side cut away view of the trailer of the present invention with the hopper in its resting position and showing the rotation of the main broom and the passage of debris caught by the main broom through an opening in the hopper. 
           [0023]      FIG. 7  shows a perspective view of the rear right of the trailer of the present invention revealing the AC charging port for the batteries. 
           [0024]      FIG. 8  shows the rear of the trailer of the present invention with the main broom and the gutter broom both in their deployed position. 
           [0025]      FIG. 9  shows the dust suppression system present within the hopper that when activated will reduce the amount of dust that is able to escape from the hopper and into the atmosphere. 
           [0026]      FIG. 10  shows a flowchart identifying the steps in assembling the trailer of the present invention. 
       
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
       [0027]    The following description of the preferred embodiment(s) is merely exemplary in nature and is in no way intended to limit the invention, its application, or uses. 
         [0028]      FIG. 1  shows a front left perspective view of the trailer of the present invention hereafter to be called Green Sweep  10 . Green Sweep  10  is powered by a self-contained electrical source, is of such size and weight as to be easily maneuvered over a variety of terrain both flat and uneven as well as hard and soft, capable of transporting and disposing of a significant amount of material, and is designed to share its electrical power source with tools and equipment that require 120 volts of AC. Green Sweep  10 , being electrically powered, is environmentally friendly and extremely quiet. Tow vehicle  6  may be virtually any sort of vehicle as Green Sweep  10  is lightweight weighing at 1,950 pounds. In addition Green Sweep  10  is very maneuverable and able to move through tight spaces as it is about 107 inches in length and 66 inches in width. Green Sweep  10  may carry within hopper  14  up to 8,000 pounds of weight which will require that tow vehicle  6  have the appropriate towing capacity. Connecting tow vehicle  6  to Green Sweep  10  is ball hitch  26  mounted at the end of tow tongue  24 . Electrical connections between tow vehicle  6  and Green Sweep  10  control tail lights  62  so that Green Sweep  10  may be towed on public streets. Green Sweep  10  is built on frame  12  and rides on wheels  18 . Fenders  22  prevents mud and other debris thrown up by the rotation of wheels  18  from making contact with frame  12  or hopper  14  and thereby degrading the appearance of Green Sweep  10 . Above frame  12  is hopper  14  which is of such a geometric shape and is hinged high on frame  12  so as to allow material within hopper  14  to be deposited into a container with supporting walls, such as a dumpster, when hopper  14  is fully lifted. Hopper  14  does not have a permanent cover so that material may be deposited within hopper  14  by maintenance workers utilizing Green Sweep  10 . However hopper  14  may be covered by both front hopper cover  48  and rear hopper cover  49  or by a single cover that is a combination of front hopper cover  48  and read cover  49 . The cover may be of sturdy fabric or of a metallic source and front hopper cover  48  may be of one material while rear hopper cover  49  of another. In addition if a single metallic cover comprising of both front hopper cover  48  and rear hopper cover  49  is to be used then the single metallic cover may be hinged at the junction of front hopper cover  48  and rear hopper cover  49  so as to allow the portion covered by front hopper cover  48  to be opened or the portion covered by rear hopper cover  49  to be opened. As Green Sweep  10  does not create a vacuum within hopper  14  during sweeping operations it is not essential that front hopper cover  48  and rear hopper cover  49  be in place during sweeping operations or that front hopper cover  48  and rear hopper cover  49  provide a vacuum seal when fitted to hopper  14 . Attached to frame  12  by gutter broom arm  28  is gutter broom  34 . Gutter broom arm  28  may be lifted by gutter broom adjustment actuator  32  and move gutter brush  34  into a stowed position while Green Sweep  10  is not operating as a sweeper. When Green Sweep  10  is operating as a sweeper gutter broom arm  28  may be lowered by gutter broom adjustment actuator  32  and move gutter brush  34  into a deployed position. When deployed, gutter broom  34  rotates in such a direction so as to sweep debris found on the left side of Green Sweep  10  into the path of main broom  36 . Gutter broom  34  rotates under the power of gutter broom motor  30 . Side light  64  illuminates the area being brushed by gutter broom  34  so that the operator of Green Sweep  10  may verify that gutter broom  34  has been lowered sufficiently enough to provide the proper amount of brushing action to move debris onto the path of main broom  36 . Opposite of gutter broom  34  is motor cover/control unit  46 , a housing that covers main broom motor  44  and also contains switches and controls for the various actuators and power controls needed to operate Green Sweep  10 . Main broom adjustment actuator  78  controls the distance of main broom  36  from the surface. Main broom  36  may be lifted by main broom adjustment actuator  78  so as to move main broom  36  into a stowed position while Green Sweep  10  is not operating as a sweeper. When Green Sweep  10  is operating as a sweeper main broom  36  may be lowered by main broom adjustment actuator  32  so as to move main broom  36  into a deployed position. When deployed, main broom  36  rotates in a direction opposite to the movement of Green Sweep  10  so as to lift debris along its path through sweeper door  88  and into hopper  14 . Main broom  36  rotates under the power of main broom motor  44 . Green Sweep  10  contains inverter  58  so that DC electrical power stored in batteries  52  may be converted into AC power in order to operate any one of a wide variety of AC powered tools or equipment such as drills, saws, blowers, mowers, trimmers, and the such. Maintenance workers may access AC power by plugging the AC powered tool or equipment into retractable AC cord  80  and then activating inverter  58  by positioning control switch  84  to the “on” position. Once the AC powered tool or equipment is no longer needed the maintenance worker will unplug the AC powered tool or equipment from retractable AC cord  80  and then deactivate inverter  58  by positioning control switch  84  to the “off” position. 
         [0029]      FIG. 2  shows a front left perspective view of Green Sweep  10  with front hopper cover  48  and rear hopper cover  49  removed from hopper  14 . Hopper  14  is connected to frame  12  by hinge  50  both shown in  FIG. 5 . Hinge  50  is about 80 inches above the surface. When hopper  14  is at its maximum raised position the rear edge of hopper  14  is also about 80 inches above the surface. As common dumpsters have walls ranging from 48 to 60 inches in height, material in hopper  14  may be deposited directly into a dumpster. This design saves time and effort by the maintenance worker as they are not required to lift material out of hopper  14  and into a dumpster. 
         [0030]      FIG. 3  shows a front left perspective view of Green Sweep  10  with hopper  14  removed exposing additional components residing below hopper  14 . Hidden behind motor cover/control unit  46  is main broom motor  44  that is used to rotate main broom  36 . Motor cover/control unit  46  also provides access to switches used to raise and lower main broom  36 , gutter broom  34 , and hopper  14  as well as switches to turn on or off main broom motor  44  and gutter broom motor  30 . Also displayed on motor cover/control unit  46  is a meter showing the amount of electrical storage currently held by batteries  52 . Batteries  52 , located below hopper  14 , are preferably 24 volt lithium phosphate or lead acid but other similar types of batteries may be used depending upon need and technological advancement. Also exposed behind hopper  14  is battery charger  56 , motor controller  60 , inverter  58 , and AC cord reel  54 . Battery charger  56  converts AC current into DC current for use in recharging batteries  52  when Green Sweep  10  is connected to an AC power source. Motor controller  60  is used to control the rotational speed of main broom motor  44 . The rotational speed of main broom  36  may be lowered to accommodate sweeping lawns or other surfaces that are more delicate or where only light debris need to be swept. Increasing the rotational speed of main broom  36  is effective in sweeping heavier debris that may be found on paved surfaces such as parking lots. Inverter  58  is used to convert DC energy stored in batteries  52  into AC energy to operate various AC power tools and equipment that may be found on the market today. Examples of AC power tools that may be operated by connecting to Green Sweep  10  include but is not limited to drills, miter saws, table saws, circular saws, sanders, polishers, grinders, jointers, planers, metal shears, nailers, routers, and more. Examples of AC powered equipment that may be operated by connecting to Green Sweep  10  include but is not limited to trimmers, blowers, pole saws, edgers, chain saws, pressure washers, log splitters and more. AC cord reel  54  contains a length, preferably 50 feet, of electrical power cord that may be used to connect the various power tools and equipment to Green Sweep  10 . To support and isolate frame  12  from vibrations caused when Green Sweep  10  is maneuvered over uneven surfaces torsion spring axle  20  dampens such vibrations. Other spring systems such as leaf springs  20  shown in  FIG. 4  may also be used to dampen vibrations created when Green Sweep  10  passes over uneven surfaces. 
         [0031]      FIG. 4  shows a front left perspective view of Green Sweep  10  with hopper  14  in its maximum raised position. When hopper  14  is at its maximum raised position the rear edge of hopper  14  is about 80 inches above the surface. As common dumpsters have walls ranging from 48 to 60 inches in height, material in hopper  14  may be deposited directly into a dumpster. When operating as a sweeper the rotational movement of main broom  36  is controlled by motor controller  60 . The rotational movement must be of such speed that debris swept up by main broom  36  is thrown into hopper  14  through sweeper door  88 . When Green Sweep  10  is being used simply to transport material sweeper door  88  may be closed to prevent material within hopper  14  from escaping through sweeper door  88 . To raise and lower hopper  14  hydraulic actuator  16  may be activated by a switch located on motor cover/control unit  46 . To support and isolate frame  12  from vibrations caused when Green Sweep  10  is maneuvered over uneven surfaces leaf springs  20  are used to dampen such vibrations. Other spring systems such as torsion spring axle  20  shown in  FIG. 3  may also be used to dampen vibrations created when Green Sweep  10  passes over uneven surfaces. 
         [0032]      FIG. 5  shows a left side view of Green Sweep  10  with hopper  14  in its maximum raised position. When hopper  14  is at its maximum raised position the rear edge of hopper  14  is about 80 inches above the surface. As hopper  14  is raised by hydraulic actuator  16  hopper  14  will pivot about hinge  50  positioned high on frame  12 . Similar trailers with hoppers traditionally hinge the hopper low on the frame and position the actuator used to lift the hopper at the end opposite the hinge. This arrangement maximizes the lifting capabilities of the actuator while at the same time minimizing the amount of expansion required by the actuator in order to tilt the hopper to an angle where material contained within the hopper may be easily remove by gravitational forces. However if the hopper is hinged high on the frame, as is hopper  14 , then a traditionally placed actuator would have to expand to such a length that the structural integrity of the actuator may be compromised or that the actuator would be more costly. Green Sweep  10  places the actuator for hopper  14 , hydraulic actuator  16 , at the same end where hinge  50  is located. Such placement does limit the amount of weight that may be lifted but provides for two important advantages. First is that the amount of expansion required by hydraulic actuator  16  in order to tilt hopper  14  to an angle where material contained with hopper  14  may be easily removed by gravitational forces is minimized. Second is that the cost of hydraulic actuator is reduced as it may be smaller than a traditionally placed actuator. Additionally  FIG. 5  shows gutter broom  34  in its stowed position appropriate when gutter broom is not in use. Finally skid shoe  86  exists at both sides of main broom  36  and along the front of main broom  36  to increase the amount of debris that is caught by main broom  36  rotational movement and thrown into hopper  14  through sweeper door  88 . 
         [0033]      FIG. 6  shows a left side cut away view of Green Sweep  10  with hopper  14  in its resting position. In addition, the rotational movement of main broom  36  is shown. The rotational movement of main broom  36  is opposite of the rotational movement of wheels  18  when Green Sweep  10  is being used as a sweeper. This causes debris to be kicked up by main broom  36  rotational movement to pass through sweeper door  88  and into hopper  14 . Main broom motor  44  is connected to main broom  36  by drive belt  42  that loops about main broom motor  44  and drive shaft  38 . About main broom  36  is housing  40  that is used to guide debris kicked up by main broom  36  through sweeper door  88  and into hopper  14 . 
         [0034]      FIG. 7  shows a perspective view of the right rear of Green Sweep  10  revealing AC charging port  82  for batteries  52 . 
         [0035]      FIG. 8  shows the rear of Green Sweep  10  with main broom  36  and gutter broom  34  both in their deployed position for sweeping. Tail lights  62  are controlled by tow vehicle  6  when Green Sweep  10  is being towed. 
         [0036]      FIG. 9  shows the dust suppression system present within hopper  14  that when activated will reduce the amount of dust that is able to escape from hopper  14  and into the atmosphere. Such a system is useful to reduce the amount of dust produced by main broom  36  when Green Sweep  10  is functioning as a sweeper in a location where humans are close by. Whenever main broom  36  is turned on so will water pump  72  be turned on. Likewise when main broom  36  is turned off so will water pump  72  be turned off. When water pump  72  is turned on water will be drawn from tank  66  though hose  68  into water pump  72  and expelled through atomizers  70 . 
         [0037]      FIG. 10  shows a flowchart identifying the steps in assembling Green Sweep  10 . The procedure is straight forward and begins with step  102  to build frame  12 . Next is step  104  which is to fabricate all of the metal parts. Step  104  may be performed concurrently with step  102 . Next is step  106  where metal parts fabricated in step  104  and frame  12  is powder coated. Next is step  108  where hopper  14  is assembled. Next is step  110  where the parts fabricated in step  104  is installed onto frame  12  and hopper  14 . Next is step  112  where hopper  14  is installed onto frame  12 . Next is step  114  where torsion spring axle  20  and wheels  18  are installed onto frame  12 . Next is step  116  where mechanical and electrical parts, motors, and brooms are installed onto frame  12 . Next is step  118  where wiring harness and switches are installed. Next is step  120  where motors and brooms are tested and replaced if necessary. Next is step  122  where sweeper components are tested and replaced if necessary. Next is step  124  where lights and switches are tested and replaced if necessary. Finally is step  126  where safety decals are installed.

Summary:
Disclosed is a versatile trailer that may be towed from job site to job site by a vehicle and within a job site be towed by a maintenance cart. The trailer may function as a mobile sweeper to clean smaller parking lots found at schools and parks as well as sweep pathways, lawns, and sidewalks to remove litter, debris, and plant waste. The trailer contains a hopper to collect material both swept by the broom from the area below the trailer as it is towed as well as allowing material to be deposited into the hopper from above the trailer. The hopper is designed so as to allow any material contained within the hopper to be deposited onto the ground or into a dumpster. Finally the trailer is designed so that the electrical power source used to operate the broom and the hopper lift mechanism may be concurrently used by maintenance workers to supply electrical energy needed to operate any electrically based power tools and equipment.