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BACKGROUND OF THE INVENTION 
     The present invention relates in general to motor vehicle repair and servicing systems, and in particular to a multi-level motor vehicle repair system that can be shipped as components and assembled on site without major building modification. The system includes integration of a parts storage and a parts delivery method to the work area so that parts storage is no longer a remote and separate function. 
     There is an increasing need for more efficient use of manpower and building area due to economic pressure to reduce operating costs of motor vehicle repair facilities. Economies gained by combining work operations at the vehicle repair lift and work bay have been documented by the development of other multi-level service applications which require building modification to accomplish a complete and proper installation. For example, some servicing systems require a full-depth pit, 6 or 7 feet in depth, within which the service worker stands to change oil, lubricate the automobile or perform other services at the underside of the vehicle. Others require half-depth pits which are used in conjunction with a ramp and lift system which elevate the vehicle an amount sufficient to allow work on the vehicle from in the pit. 
     As examples of previous vehicle servicing systems, see U.S. Pat. Nos. 5,054,580, 5,033,489, 4,724,875, 4,618,029, 4,284,173, 4,188,985, 3,942,297, 3,756,419, 3,599,382, 3,552,521, 2,898,641, 2,009,384, 1,722,818, 1,357,022, 835,059. 
     Other examples of automotive servicing systems, permitting a worker to service the vehicle from below and from other positions, include a metal framework designed to be positioned in a basement, below a vehicle-supporting floor, produced by Unilube Systems, Ltd. of Arlington, Tex.; and a half-pit vehicle lift servicing system marketed under the name Autop by Stammhaus Franz Hörnstein GmbH and Co. Kg of Heilbronn, Germany. 
     Prior vehicle servicing apparatus and systems have not provided a conveniently used three-level or four-level servicing facility which is on-site erected from individual transported components into a facility which is placed on a floor, not requiring a basement or pit, with the vehicle or vehicles supported on an upper level which is a part of the erected structure. The prior art also failed to provide for convenient location of parts and servicing equipment at a lowermost level at which a number of service personnel are located and can get convenient access to the parts and equipment. 
     SUMMARY OF THE INVENTION 
     The present invention is directed to a multi-level motor vehicle service system for simultaneous repair processes by several technicians at a single location. The system is designed as a kit of parts with components that are pre-manufactured and then shipped to the site for assembly, erection, and installation. Objects of the invention are accomplished by assembling the various component parts on site into a freestanding, self-supporting, and fully functioning unit having four major levels where work processes are performed. The vehicle to be repaired is delivered to the individual work station by an operator driving the vehicle, workers manually pushing a disabled vehicle, manually operated power assist in contact with the vehicle, an unmanned remote controlled power transfer system, or any combination thereof. 
     Metal structural elements provide a framework that may be connected together at the site without welds and with bolted or other methods of connection that provide major structural integrity of the system. Other system components are attached to the structure such as stairs for moving between levels, floors for work platforms, movable work steps, areas for tool trays, special tool storage, computer terminals, technicians&#39; lockers, technicians&#39; tool storage, testing equipment, waste fluid collection equipment and fluid replacement equipment, lighting, electrical service, compressed air and other utilities. 
     In one preferred embodiment the system allows for two or more complete assemblies to be joined horizontally and stacked vertically utilizing previously underutilized building volume by providing additional work levels without major building modification. 
     The preferred system has four levels which can be identified from top to bottom as first to fourth level or level A to level D. The top level (first level or level A) is the level on which the vehicle sits and provides for the following tasks to be performed: Change engine oil and filter. Replace fuel filter. Service cooling system. Replace spark plugs. Inspect spark plug wires. Inspect air cleaner and intake system. Replace air filter and crankcase ventilation filters. Check throttle body mounting bolt torque and linkage. Inspect engine accessory drive belt. Inspect exhaust gas re-circulation system. Check engine timing and distributor. Inspect brake system and brake fluid level. Check windshield washer fluid level. Check hydraulic clutch fluid level. Check power steering fluid level. Check transmission fluid level. Inspect electronic vacuum regular valve. Inspect evaporative control system. Inspect shields and under hood insulation. Inspect thermostatically controlled engine cooling fan. Inspect CDRV system. Inspect exhaust pressure regulator valve. Inspect windshield wiper blades. Inspect instruments. Inspect alarms. Inspect window controls. Inspect air conditioning and heating. Inspect automatic mirrors. Inspect sun roof mechanism. Inspect seat belts and airbags. Inspect all exterior and interior lights. 
     From the B level (second or upper intermediate level), the following may be done: Check tire inflation and rotate wheels. Inspect brakes. Inspect fuel tank, cap, and lines. Check door looks, lubricate key lock cylinders. Lubricate body/suspension. Check starter switch. Check brake transmission shift interlock. Check steering column lock. Check parking brake and automatic transmission park mechanism. Inspect steering, suspension, and front drive axle boots and seals. Repack front wheel bearings. 
     From the C or third level (lower intermediate level), a worker can: Change engine oil and filter. Lubricate chassis. Lubricate body. Service cooling system. Service transmission or transaxle. Perform service on rear axle. Inspect fuel tank, cap, and lines. Inspect hydraulic clutch system. Lubricate clutch fork ball stud. Inspect steering, suspension, and front wheel driver axle boots and seals. Inspect exhaust system. Inspect shields. Inspect brake system. Check for oil leaks. 
     At the fourth level, which is the bottom or D level, a floor on which the apparatus rests, the facility provides for: Fast moving parts storage. Engine component repair. Engine component assembly. Transmission repair. Transmission component assembly. Suspension repair. Wheel bearing repair. Brake lathe. Parts cleaning. Core refinishing. Electrical component diagnostics and repair. 
     Repair technicians move between levels via a series of stairs. Stairs and rails are component parts of the apparatus and system. The stairs are attached to structural members and can act as bracing members. 
     The vehicle can be elevated so that its tires are several inches above level A by vehicle jacks that are integral to level A. When the vehicle is raised, the technician on level B performs repairs that require the wheel assemblies to spin free or be removed while all the other areas of the vehicle remain accessible for other tasks. 
     An opening in the floor system of level A directly below the vehicle allows a technician operating on level C access to the vehicle undercarriage without moving the vehicle or raising it above level A. Fold out or sliding steps and platforms from the sides of level A allow the technician to access the vehicle interior and engine compartment from level B when needed. Replacement fluids for maintenance and repair are dispensed from either side and near the engine compartment. At level A, and accessed from level C, is a fluid collection tray that moves on rollers or pivots the length of the opening in level A. 
     On level A, in front of the vehicle, there is a removable panel which allows heavy vehicle components (including the engine) to be lowered to level D for disassembly and repair. 
     Stacked at one end of the multi-level service system bay is a work center for level A and one for level D. These are comprised of a modular furniture system that includes tool storage units, personal storage units, reference library, testing equipment, computer terminal, parts storage, dumbwaiter, and work bench. 
     Below the floor panel of level C and supported on level D is a tool and parts storage system comprised of shelves, drawers, and specialty tool storage. Adjacent on level D is a parts storage system including adjustable shelves and bins attached to the system structure. Also accessed from level D are modular work benches. 
    
    
     It is among the objects of the invention to improve over prior vehicle servicing systems, with a completely modular apparatus, quickly and easily site-erectable, which is essentially free-standing on a building floor and providing multiple work levels for the mechanics or other service persons, including the top level on which the vehicle rests. These and other objects, advantages and features of the invention will be apparent from the following description of a preferred embodiment, considered along with the accompanying drawings. 
     DESCRIPTION OF THE DRAWINGS 
     FIG. 1 is an elevational view in section showing an embodiment of a multi level vehicle servicing facility according to the invention, including multiple units of a modular apparatus within the facility. 
     FIG. 2 is a plan view, somewhat schematic, showing the upper level of the facility. 
     FIG. 3 is an elevation view in section, taken from a direction at right angles to that of FIG. 1, generally along the line  3 — 3  in FIG. 2, showing the facility. 
     FIG. 3A is an elevation view similar to FIG. 3, omitting the building and only showing two service units. 
     FIG. 4 is a view similar to FIG. 1, but showing a facility in a building having a basement. 
     FIG. 5 is a view in perspective showing one unit of the vehicle servicing apparatus, made up of assembled components, and which can form one of the units shown in the facilities of FIGS. 1-4. 
     FIG. 5A is a schematic plan view showing relationship of four different levels of the apparatus and system of the invention. 
     FIG. 6 is a perspective view showing a facility, or a portion of a facility, using side-by-side and stacked units of the type generally shown in FIG.  5 . 
     FIG. 7 is an elevation view in section, similar to FIG. 1 but showing a stacked facility, two units in height. 
     FIG. 8 is an exploded perspective view indicating components of a modular, field-erectable unit. 
     FIG. 8A is an enlarged perspective view showing a cabinet/work station also shown in FIG. 3A,  5  and  8 . 
     FIG. 9 is a perspective, exploded view showing some of the components in greater detail. 
     FIG. 10 is an exploded, perspective view showing some floor components of a unit. 
     FIG. 11 is an exploded view showing level A floor platforms. 
     FIGS. 12-15 are diagrammatic perspective views indicating several arrangements in which the surfacing units can be arranged side-by-side and stacked in a vehicle servicing facility. 
     FIGS. 16A-16D are schematic representations in plan and sectional elevation, comparing the system of the invention to a conventional shop layout. 
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     FIG. 1 shows in cross section an automotive servicing facility  10 , preferably housed within a building  12  having a floor  14 , walls  16  and a roof  18 . Several cars  20  are shown within the facility, positioned on a first level  22 , sometimes referred to as the A level of the facility. As seen in FIGS. 1 and 3 of the drawings (FIG. 3 being a sectional view at right angles to FIG.  1 ), the facility  10  includes a series of field-erectable automotive servicing apparatus or units  24 , which are free-standing on the building floor  14 , these units  24  each comprising a framework with platforms, the units providing the first work level  22  on which the vehicles are located, rather than a floor of the building providing this level. Preferably the units  24  are not connected to the building walls, but minor, non-load-bearing connections can be made as desired. Thus, the building is basically unmodified to establish the vehicle servicing facility  10 , and as seen below, if and when the facility is to be removed and the building used for other purposes, this is easily accomplished without leaving unwanted building modifications. 
     In FIG. 1 an aisle or corridor floor  26  is shown supported between a series of multi level servicing units  24 , each row of such units being adjacent to a wall  16 . A row of four of such units is shown in the orthogonal sectional view of FIG.  3 . FIG.  2  shows in plan view an example of an upper or A level of a facility  10  having rows of four such units  24  on each side of the building, with a vehicle entry or aisle floor  26  between them. The cars  20  are brought to the A level  22 , which in this form of the system is elevated above the ground floor of the building and the ground  28  outside, by an appropriate ramp or lift arrangement, not shown in FIGS. 1-3. FIG. 1 also shows a storage unit  29  on the building floor (D level), under the elevated floor  26 . This represents equipment or storage for parts or tools. 
     In FIG. 3 the units  24  are seen side-by-side in the building, connected together to form a part of the free-standing servicing facility. FIG. 3A shows several units side-by-side with cabinets generally indicated at  27  (also seen in FIG.  1 ), on the A level and near the front of the car. The building is not shown in FIG.  3 A. 
     A single unit  24  is shown in FIG.  5 . Some of the units are opposite-hand from the units shown in FIG. 5, and from one another, as seen, for example, at left and right sides of FIG.  3 . This relates primarily to details regarding location of stairs and access platforms, and the units  24  may be made in such a way that they can be erected for either configuration. 
     The A level or first level  22  is the level on which the car resides and on which services are performed on the engine as well as on other components of the vehicle discussed above. It may be about 8½ to 9 feet (about 260-280 cm) above the floor  14 . Below the A level  22  is a second level or B level  30 , approximately 2 feet (65-70 cm) below the A level. As shown in FIGS. 1 and 3, a worker  32  can stand on the B level  30  to work on tires, brakes, etc. as listed above. The B level comprises a pair of walkways  30  at either side of the vehicle  20 . The vehicle  20  is positioned at a vehicle location defined by A level support platforms  34  and  36 , which may be relatively narrow strips as shown in FIGS. 2 and 3. Fold-out or slide-out platforms  37 , capable of sliding longitudinally along the vehicle for desired positioning, preferably are included at the outer edges of the support platforms  34  and  36  as seen in FIG.  2  and also FIG.  5 . These can be similar to those included in the Autop system referenced above. The B level platforms  30  are positioned to left and right and beneath the A level platforms  34 ,  36 , providing work areas on either side of the vehicle particularly as shown in FIG.  3 . FIG. 5 also reveals one of these level B platforms  30  clearly. 
     The next level down is the third level or level C, shown at  38  in the drawings. At the C level an automotive servicing person  40  is able conveniently to work on the underside of the car, for the tasks listed above. This C level is about 3 feet (approx. 90 cm) below the B level, and is substantially centered at the vehicle location, directly below the vehicle  20  and an access opening  42  below the vehicle and between the left and right vehicle support platforms  34 ,  36 . 
     The floor  14  of the building provides a fourth or D level as shown in the drawings. At this level, as shown in FIGS. 1,  3  and  5 , service personnel can conveniently access tools, parts and equipment, located in shelves  44 , drawers  46  and cabinets  48  which form components of the modularly assembled servicing unit or apparatus  24 . Equipment and machinery for performing various operations on automotive components are also located at the D level, to be accessed from the floor of the building, conveniently for multiple vehicle servicing units  24 . 
     FIG. 4 shows a facility  10   a  similar to that of FIGS. 1-3, but in a building  12   a  which has a basement  50 . In this case the units  24  rest on the building&#39;s basement floor  14   a  as shown, with the A level  22  located at or near the ground level  52  outside the building. 
     FIG. 5A shows schematically the four work levels A-D or  22 ,  30 ,  38  and  14 , in plan view and as they relate to each other, helping to show the relationship of the levels as in FIG.  5 . 
     FIGS. 6 and 7 show stacking of the units  24 . Both drawings are somewhat schematic, with FIG. 6 showing a facility  54  with units  24  assembled side-by-side and stacked two tiers high. As can be seen from the drawing, this requires inclusion of an additional floor  56 , supported on main vertical frame members  58  and  60  at back and front, and horizontal edge beams  62  and  64 . 
     In FIG. 7 a facility  66  is shown in elevation, generally similar to what is shown in FIG. 1 but in a taller building  12   c , accommodating the units  24  two tiers high. As indicated, the upper units  24  include a floor  56  as in FIG. 6, and in this arrangement a floor section  26   a  is suspended between rows of the units  24  to provide a continuing floor at the level of the floor  56 , serving as a D level or fourth, lower most level for the upper tier  68 . An additional such suspended floor section  26   c  is shown at the A or upper level of the upper tier  68 , this platform being for entry and manipulation of cars to be put on the upper tier units  24 . Storage units  29  are also shown at both tiers, and these are similar to what is shown in FIG.  1 . The ground is shown at  28  for an above-ground floor, but indicated alternatively at  52  for a building with a basement. 
     FIGS. 8-11 show components and details of construction for the modular units  24  such as shown in FIGS. 5 and 6. In FIG. 8 are shown a collection of components which make up a unit as in FIG.  5 . These include a pair of U-shaped frames  70 , a series of vertical and horizontal structural components  72  and  74 , platforms  30   a  and  30   b  which make up the B level walkways  30 , a C-level platform  38 , with a structural perimeter  38   a , a landing  76  which is positioned between stair steps in FIG. 5, narrow vehicle platforms  34  and  36  for the A level, additional A level platforms  78  and  80 , left and right vehicle lifts  82 , stair and rail components  84 ,  86 ,  88 ,  90 ,  92 ,  94  and  96 , cabinets  98 ,  100 ,  104 ,  106  and  108 , and shelf components  110  which can be secured to the vertical frame members  72  for tool and parts storage for the worker on the C level. FIG. 8A shows the cabinet  98  larger, revealing a testing monitor  98   a , tool storage board  98   b , tool drawers  98   c , rolling tool case  98   d , etc., all within reach of a technician working on a car&#39;s engine. An item  102  shown between the upper and lower cabinets  100 ,  104  is a dumbwaiter for movement between the A and D levels, accessible from cabinet doors  109  (see also FIG.  5 ). The sliding platforms  37  for level A are also shown in FIG.  8 . Essentially all of these components can be seen in their respective assembled positions in FIG.  5 . The shelves  110  are connected to vertical structural members  72  framing the C-level platform, in any appropriate manner. 
     FIGS. 5 and 8 show that the platform component  80 , which is adjacent to tool and parts cabinetry  98  and  100  and located for access to the front end of the car, has a removable panel  80   a . This is for lowering parts, including components as large as an engine, down through level A and past levels B and C to the D level, i.e. the floor  14 , for machining, servicing, etc. This can be accomplished for heavy components using a ceiling hoist (not shown) secured to the roof/ceiling  18  as in FIGS. 1-4. For smaller parts the dumbwaiter  102  is used. 
     Several of the major components are shown larger in FIGS. 9,  10  and  11 . FIG. 9 shows the U-shaped structural frames  70 , as well as all the vertical and horizontal structural components  72  and  74  of the modular unit, in larger scale. The figure should be reviewed in combination with FIG.  5  and sometimes FIGS. 1-3, as well as FIG.  8 . FIG. 9 shows that the unit comprises in large part a framework  112  formed of the vertical and horizontal structural members  72  and  74 . These members, preferably of steel, are as large and deep in cross section as needed for the weight to be carried. The vertical members  72 , as well as the frames  70 , comprise floor-bearing members, and they may or may not have added or formed floor-bearing “feet”  118  at bottom ends. In the case of stacking of the service units, the U-shaped structure  70  will generally be larger at the lower level. Also, as can be seen from FIGS. 6 and 3, for example, the U-shaped structural member  70  can be replaced with different members when the servicing units are assembled side-by-side. FIG. 6 shows, at the lower level, main structural uprights  115  and a beam  116  spanning between the uprights, with other vertical structural members  72  supporting the beam  116  between its ends. These main structural members  70 ,  115  and  116  can be replaced or configured as needed for the size and arrangement of the facility being assembled. 
     FIG. 9 shows one preferred structural assembly for a unit  24  of the system, in a partly assembled frame  112 . The frame is shown without the decking or platform components  80 ,  34 ,  36 ,  78 ,  30 ,  38 , etc. Those are shown primarily in FIGS. 10 and 11, which should be considered in conjunction with FIG.  9  and FIG.  5 . 
     As shown in FIG. 9, the vertical structural components  72  preferably have some form of pad or foot  118  at the lower end of each such member, for bearing against the building floor. As seen in FIGS. 5 and 9, the upper or A level is supported at the deeper or wall end of the unit by beams  70   a  and  74   a , with the work platform  80 , on which the cabinets  98  and  100  are located, spanning between those horizontal beams. Additional horizontal beams or joists can span between the beams  74   a  and  70   a  if needed, depending on the strength of the platform  80  and its spanning distance. 
     The narrow platforms  34  and  36  on which the car rests, defining the vehicle location, are supported in this embodiment by horizontal beams  74   b  running in the longitudinal direction relative to the vehicle location, and these extend between the transverse beam  74   a , at the location of vertical members  72   a , and a pair of opposite-end vertical members  72   b  as shown. Additional vertical column members  72   b , for intermediate support of the vehicle area of level A, can be provided, on both sides of the vehicle location, as shown. The longitudinal beams  74   b  are rigidly attached to the tops of all of these vertical members  72   b , and they are of sufficient size such that cantilevered brackets or joist members  74   c  can be used to extend in both transverse directions, in opposed transverse directions from the two beams  74   b , as shown, to provide adequate support for the vehicle tracks or narrow platforms  34 ,  36  (FIGS.  5  and  11 ). 
     For level B, a series of horizontal joists  74   d  extend as shown, between vertical members. These vertical members include legs  72   c  positioned at left and right sides of the frame. FIG. 9 shows several such joists  74   d  supported in this way, for supporting the B-level platform  30  shown in FIG.  10 . 
     At the left side of the assembly shown in FIG. 9, the remaining platform of the B level is supported. As shown in FIG. 10, this left side platform  30   b  is of greater length than the right platform  30  because of different stair arrangements, with the stair steps  94  located in this area. The platform  30   b  rests on joists  74   d  similar to those on the right side, but with an end joist  74   e  supporting the end of the platform, that joist being connected to a column  72   b  which, together with a similar column  72   b , may be affixed to and support the U-shaped frame  70  in the assembly, as shown in FIG. 5, although FIG. 9 shows a beam  74   h  extending across the end of the unit, connected to two columns  72   b  and a column  72   d , and which may be connected to the U-shaped frame  70 . Other beam arrangements can be used for different facility configurations, in lieu of the frame  70 . The left end of the joist  74   e  shown in FIG. 9 can be framed into the U-shaped member  70  or it can have its own column support  72   e.    
     The C level of the servicing unit, indicated as a platform  38  in FIG.  10  and FIG. 5, is supported by lower horizontal framing members or joists  74   f  (longitudinal) and  74   g  (transverse). These are shown connected to the upright columns  72   a  and  72   b  in FIG.  9 . 
     A column  72   f  is shown in FIG. 9 for support of a stair landing  76  and stair  88  shown in FIG. 5, the landing also seen in FIG.  10 . As shown in FIG. 5, the landing  76  is also supported by the U-shaped frame  70 , columns  72   d  and  72   b.    
     The on-site connection of structural components in the kit of parts which comprises the invention is an important feature. It is important that these connections be non-permanent, in that they are assembled and are capable of dismantling, e.g. using tools. The precise type of dismantlable connections is not important, but only that the connections be made on site, in a modular and efficient manner, with the connections capable of later disassembly. Thus, welding should not be used. Bolts may be used, with nuts or threaded apertures, as removable fasteners for erecting the system. Other examples are keyed, wedge type inserts, tapered pins, or pinned tube-in-socket, pinned mortise and tenon, or other types of connectors. 
     FIG. 11 shows the vehicle jacks  82  for the A level. These are shown exploded along with the A level platforms  34 ,  36  and  80 . As indicated, these jacks, which are preferably hydraulic or screw type jacks capable of raising the vehicle a few inches, are seated into openings  82   a  in the car supporting tracks or platforms  34 ,  36 . Those platforms  34 ,  36  can be integral as shown in FIG.  11 . 
     FIGS. 12-14 are schematic diagrams showing blocks representing the modular vehicle servicing units  24 . These are different arrangements within which facilities can be assembled, and it should be understood that any width can be achieved, even though widths of only two units are shown in these figures. 
     FIG. 12 shows a simple side-by-side arrangement, which is similar to the lower half of the facility shown in FIG.  6 . FIG. 13 shows the arrangement of FIG.  6 . Again, the number of units can be considerably more than two in the width direction. The A level is shown at A in these diagrams. 
     FIG. 14 indicates a facility as in FIG. 12 but with the side-by-side units doubled across an aisle or corridor, with an elevated corridor platform shown at  26 , equivalent to the corridor platform  26  shown in FIG.  1 . FIG. 15 shows a similar arrangement, but with the units stacked two tiers high as in FIG.  13 . Ingress and egress for cars can be by any of several means—in a building with a basement (FIG.  4 ), by ground-level access; otherwise by ramps, side-hill entrance at A level, or a lift. 
     FIGS. 16A-16D show a comparison of a conventional automotive workshop and the multi-level service system of the invention, with system layouts and employee access to equipment, tools and parts compared. All views are schematic, with the plan and elevational section views of FIGS. 16A and 16B representing prior art. These views, along with the table below, demonstrate that a shop with 15 work stalls in a conventional system is comparable to a shop with only 6 stalls in the multi-level system of the invention. In the conventional shop  120 , the 15 work stalls  122  are arrayed on opposite sides of a central service drive  124 , in the conventional manner. A parts desk or parts issue center is located at  126 , and parts are stored at  128 . This is remote from the work stalls in most cases. The conventional shop  120  has equipment, tools and mechanical support, such as machinery for surfacing brakes or working on engines, at a single location  130 . The dashed lines  132 ,  134  show the average walking distance required for a service worker to obtain parts and to use the equipment at  130 . 
     FIGS. 16C and 16D, depicting the system of the invention, show the convenient locating of parts in cabinets  128   a  on the D level or lowest level, located close to the six multi-level servicing units  24  and under the center aisle or drive between the two sides of the facility as shown. The equipment, tools and mechanical support are located also on the D or lowest level in the system of the invention, such as at  130   a  as shown in FIG. 16C, in this case near the center two work stalls  24 . A dashed line  132   a  in FIG. 16C indicates the short walking distance of a technician to secure parts, with very little walking distance also required for access to equipment and tools. The dashed outlines  136  in FIG. 16D indicate portions of the conventional building which are not needed for the system of the invention. 
     The table below shows an example comparison between a conventional workshop and a multi-level service system of the invention, with indication of savings in ground area required and total building volume, as well as approximate average walking distance and time required per work order and for obtaining parts. These figures are approximate, but indicate the very significant increase in efficiency afforded by the multi-level service system of the invention. 
     
       
         
               
             
               
               
               
             
           
               
                   
               
               
                 CONVENTIONAL WORK SHOP VS. MULTI-LEVEL 
               
               
                 SERVICE SYSTEM 
               
             
          
           
               
                   
                 Multi-level Service 
                 Difference/ 
               
               
                 Conventional Work Shop 
                 System 
                 Saving 
               
               
                   
               
               
                 EXAMPLE: 15 TECHNICIAN 
                   
                   
               
               
                 SERVICE OPERATION 
               
               
                 15 Work stalls w/1 
                 6 Work stalls w/2.5 
               
               
                 technician per stall = 15 
                 technicians per stall = 
               
               
                 technicians 
                 15 technicians 
               
               
                 125 SF of parts/ 
                 125 SF of parts/ 
               
               
                 conventional work stall = 
                 conventional work 
               
               
                 1875 SF 
                 stall = 1875 SF 
               
               
                 GROUND AREA (footprint) 
               
               
                 9026 SF 
                 2880 SF 
                 6147 SF 
               
               
                   
                   
                 Or 68% 
               
               
                 VOLUME (enclosed space) 
               
               
                 7056 SF × 20 = 141,120 Cu FT 
                 2880 SF × 20 = 
               
               
                   
                 57,600 Cu FT 
               
               
                 1971 SF × 12 = 24,020 Cu FT 
               
               
                 Total = 165,140 Cu FT 
                   
                 107,540 Cu Ft 
               
               
                   
                   
                 Or 65% 
               
               
                 TECHNICIAN TIME 
               
               
                 Walking distance 
                 40 FT per work order 
                 6:1 
               
               
                 240 FT per work order 
               
               
                 Parts issuing time 
                 5 min. 
                 2:1 
               
               
                 10 min. 
               
               
                   
               
             
          
         
       
     
     The above described preferred embodiments are intended to illustrate the principles of the invention, but not to limit its scope. Other embodiments and variations to this preferred embodiment will be apparent to those skilled in the art and may be made without departing from the spirit and scope of the invention.

Summary:
A multi-level vehicle servicing system includes site-erectable units each with four levels, to facilitate vehicle repairs by several technicians at the same time. Each unit includes vertical structural members, horizontal supports, flooring, tool storage, parts storage, panels, stairs, ladders, ramps, lifting mechanisms to raise the vehicle off its wheels, and mechanisms to facilitate removal of heavy repair components to other levels below. Lighting, power, compressed air, fluid delivery and extraction, and fire suppression systems are integrated in the system of components. The system is erected on a conventional building floor and is free-standing, independent of the building structure itself. The modular apparatus is installed without major modifications to an existing building of appropriate size and structural compatibility. Several of the four-level units can be stacked and any number may be combined in any horizontal configuration.