Patent Publication Number: US-11041513-B1

Title: Hydraulic cylinder assembly

Description:
RULE 1.78(F)(1) DISCLOSURE 
     The Applicant has not submitted a related pending or patented non-provisional application within two months of the filing date of this present application. The invention is made by a single inventor, so there are no other inventors to be disclosed. This application is not under assignment to any other person or entity at this time. 
     This Application is a continuation-in-part of the following utility and design patent applications: 
     Ser. No. 15/954,393; filed on Apr. 16, 2018, currently pending; 
     Ser. No. 29/723,616; filed on Feb. 8, 2020, currently pending; and 
     Ser. No. 29/726,449; filed on Mar. 3, 2020, currently pending, and the Applicant claims the priority of each of the currently pending, above listed, patent applications. 
    
    
     BACKGROUND OF THE INVENTION 
     There is no research of development of this application which is federally sponsored. 
     FIELD OF THE INVENTION 
     The present invention relates to a Hydraulic Cylinder Assembly and more particularly pertains to an offset hydraulic pump and reservoir. 
     DESCRIPTION OF THE PRIOR ART 
     The use of electric hydraulic cylinders is known in the prior art. More specifically, electric hydraulic cylinders previously devised and utilized for the purpose of lifting purposes are known to consist basically of familiar, expected, and obvious structural configurations, notwithstanding the number of designs encompassed by the prior art which has been developed for the fulfillment of countless objectives and requirements. 
     While the prior art devices fulfill their respective, particular objectives and requirements, the prior art does not describe a Hydraulic Cylinder Assembly that utilizes an offset hydraulic pump and reservoir, as well as downwardly located and oriented pump fluid pickup ports, as is used in the current invention. 
     In this respect, the Hydraulic Cylinder Assembly, according to the present invention, substantially departs from the conventional concepts and designs of the prior art, and in doing so provides an apparatus primarily developed for the purpose of an offset hydraulic pump and reservoir. 
     Therefore, it can be appreciated that there exists a continuing need for a new and improved Hydraulic Cylinder Assembly which can be used for lifting which has an offset hydraulic pump and reservoir. In this regard, the present invention substantially fulfills this need. 
     SUMMARY OF THE INVENTION 
     In view of the foregoing disadvantages inherent in the known types of electric hydraulic cylinders now present in the prior art, the present invention provides an improved Hydraulic Cylinder Assembly. As such, the general purpose of the present invention, which will be described subsequently in greater detail, is to provide a new and improved Hydraulic Cylinder Assembly which has all the advantages of the prior art and none of the disadvantages. 
     In describing this invention, the word “coupled” is used. By “coupled” is meant that the article or structure referred to is joined, either directly, or indirectly, to another article or structure. By “indirectly joined” is meant that there may be an intervening article or structure imposed between the two articles which are “coupled”. “Directly joined” means that the two articles or structures are in contact with one another or are essentially continuous with one another. 
     By adjacent to a structure is meant that the location is near the identified structure. 
     To attain this, the present invention essentially comprises a A hydraulic cylinder assembly having a free-floating motor and pump is herein described. The hydraulic cylinder assembly has a free-floating motor and pump comprises several components, in combination 
     First there is a motor. The motor has a housing, with the housing having an upper extent and a lower extent. The motor housing has a pair of mounting bolt holes there through. The motor has an output shaft, with the output shaft having an upper end and a lower end. The lower end of the motor output shaft has a hexagonally shaped recess therein. 
     There is a power source which is operatively coupled to the motor. 
     There is a hydraulic fluid reservoir. The hydraulic fluid reservoir has a front wall, a rear wall, a right side wall, and a left side wall. The front wall is continuous with the right side wall and the left side wall. The rear wall is continuous with the left side wall and the right side wall. The walls collectively form a fluid holding volume therein. The right side wall has a fill plug opening, with the fill plug opening having an associated fill plug. 
     The hydraulic fluid reservoir has an open upper end with an upper flange. The upper flange of the hydraulic fluid reservoir has a pair of threaded motor mounting bolt holes there in. The upper flange of the hydraulic fluid reservoir has a pair of motor mounting bolts, which pass through the motor housing, and couple the motor to the upper flange of the hydraulic fluid reservoir. 
     The hydraulic fluid reservoir has an open lower end, with the lower end of the hydraulic fluid reservoir having a lower flange. The lower flange of the hydraulic fluid reservoir has four corners, with each of the four corners of the hydraulic fluid reservoir lower flange having an attachment bolt hole there through. Each hydraulic fluid reservoir lower flange bolt hole has an associated lower flange bolt. 
     There is a cylinder mounted reservoir base plate which has a generally rectilinear configuration. The cylinder mounted reservoir base plate has an upper surface and lower surface, with a thickness there between. The thickness of the cylinder mounter reservoir base plate forms a peripheral edge. The peripheral edge of the cylinder mounted reservoir base plate has a outward right side, an inward left side, a front side, and a rear side. The inward left side of the cylinder mounter reservoir base plate has a pair of threaded bolt holes there in, with a pair of associated cylinder mounting bolts. 
     The inward left side of the base plate has a pair of fluid path holes therein, being a first fluid path hole and a second fluid path hole. The first fluid path hole is continuous with a base plate first fluid path. The second fluid path hole is continuous with a base plate second fluid path. Each fluid path hole has an associated o ring. The inward left side of the base plate has a mounting stud protruding from a mounting stud hole in the base plate. The mounting stud has an associated o ring. The base plate has four threaded mounting bolt holes there through. The four threaded mounting bolt holes are sized to threadedly receive each of the four lower flange bolts. The base plate threaded mounting holes run from the upper surface of the reservoir base plate to the lower surface of the reservoir base plate. 
     The reservoir base plate has a flow regulator hole there through. The flow regulator hole runs through the reservoir base plate from the outward right side of the base plate to the inward left side of the base plate. The flow regulator hole commences at the outward right side of the base plate and has a partially threaded first internal dimension. The flow regulator hole also has a tapered section. The flow regulator hole has a second internal dimension, with the second internal dimension being less than the first internal dimension. 
     The taper of the flow regulator hole is continuous from the first internal dimension to the second internal dimension. The flow regulator hole runs through the base plate from the outward right side of the base plate to the inward left side of the base plate. The inward left side flow regulator hole has the second internal dimension. 
     The flow regulator hole of the reservoir base has an associated flow regulator. The flow regulator has a threaded outward end, with retention clip groove, having an associated retention clip. The flow regulator has a plurality of o ring grooves, with associated o rings. The flow regulator has a right outward end having a first external dimension with a thread. The first external dimension thread of the flow regulator being sized to mate with and be threadedly received within the right outward end thread of the flow regulator hole. The flow regulator has a middle section, with the middle section having an external diameter configured as a taper, with the taper of the middle section sized to fit within the taper internal dimension of the flow regulator hole. The flow regulator hole has an inward left end which has a second internal dimension. The second external dimension of the flow regulator is sized to fit within the second internal dimension of the flow regulator hole. The second external dimension of the flow regulator is less than the first external dimension of the flow regulator. 
     The base plate first fluid path runs from the upper surface of the base plate to the left inward surface of the base plate, thereby forming the first fluid path hole of the left inward surface end of the base plate, being the base plate first fluid path hole. The base plate first fluid path hole which is located on the left inward surface end of the base plate has an o ring groove with an associated o ring. The base plate second fluid path runs from the upper surface of the base plate to the left inward surface of the base plate, thereby forming the base plate second fluid path hole which is located on the left inward surface end of the base plate. The base plate second fluid path hole, which is located on the left inward surface end of the base plate, has an o ring groove with an associated o ring. The second fluid path meets and joins the flow regulator hole, which allows the regulation of fluid flow. 
     There is a fluid pump. The fluid pump has an upper component and a lower component. The upper component has an upper surface and a lower surface, with a thickness there between. The fluid pump upper component has a plurality of coupling bolt holes there through. The fluid pump upper component has a pair of gear shaft holes there through. 
     The lower surface of the fluid pump upper component has a pair of overlapping gear recesses. The gear recesses each have an intersecting portion. 
     The lower surface of the fluid pump upper component has a pair of fluid grooves. The fluid grooves of the fluid pump upper component lower surface connect to the intersection portion of the gear recesses of the fluid pump upper component lower surface and to the first fluid path pickup and delivery hole and the second fluid path pickup and delivery hole. 
     The fluid pump lower component has an upper surface and a lower surface, with a thickness there between. The thickness of the fluid pump lower component forms four side edges, being a right side edge, a left side edge, a forward edge, and a rearward edge. The fluid pump lower component forward edge and the fluid pump lower component rearward edge each have a communicating fluid shuttle valve hole there through. The fluid shuttle valve hole has a stepped configuration. The fluid shuttle valve hole has an associated fluid shuttle valve, with a pair of fluid shuttle valve hole end plugs. The fluid shuttle valve comprises a pair of opposed springs, a pair of opposed needle valves, a pair of opposed shuttle valve seats, and a centrally located shuttle. Each of the fluid shuttle valve hole end plugs has a slot therein. Each fluid shuttle valve hole end plug has an associated o ring. 
     The fluid pump lower component has a plurality of threaded coupling bolt holes there through. Each of the threaded coupling bolt holes of the fluid pump lower component have an associated coupling bolt. The fluid pump lower component has a pair of gear shaft holes there through. The lower surface of the fluid pump upper component has a plurality of base plate mounting bolt holes there through. 
     The fluid pump lower component has a pair of ball check valves comprising a ball seat and a ball, for permitting one way flow of fluid, at a time, through the pump. The check valves are located in the fluid pickup and delivery holes. This allows fluid to be drawn into the pump, or pressured from the reservoir into the pump, via the fluid pickup and delivery holes, with the check valves only permitting fluid to enter the pump when the fluid pressure within the reservoir is either greater than or equal to the pressure within the pump, so as to prevent cavitation on the feed side of the gear combination. When the pump pressure increases on one side of the pump gears, the check valve on that side of the pump is pressurized and forced closed. If, on the other side of the pump, the fluid is pulled away from the gears, and the pressure on that side of the gears is lower than the reservoir pressure, such as is present in cavitation, the check valve is pulled open, and fluid enters the pump from the reservoir through the fluid pickup and delivery holes. The check valves restrict fluid movement, but not air movement, as when the air is being bled from the fluid passageways. In this instance such as occurs during bleeding, air, which returns through the fluid paths is allowed to exit the pump through the fluid pickup holes. 
     The upper surface of the fluid pump lower component has a pair of lower component shuttle valve delivery fluid path holes there in, with each lower component shuttle valve delivery fluid path hole having an associated linear recess. Each of the lower component shuttle valve delivery fluid path holes is continuous with one of the pair of fluid pump lower component shuttle valve delivery fluid paths. The fluid pump lower component shuttle valve delivery fluid paths, being the lower component first shuttle valve delivery fluid path and the lower component second shuttle valve delivery fluid path, run from the lower component upper surface to the lower component lower surface and are downwardly directed into the shuttle valve hole, and shuttle valve. 
     The fluid path holes of the lower component upper surface communicate through the lower component first fluid path and the lower component second fluid path with the shuttle valve hole. The fluid pump lower component lower surface has a pair of fluid path holes, being a fluid pump lower component lower surface first fluid path hole and a fluid pump lower component lower surface second fluid path hole, with the fluid path holes of the fluid pump lower component lower surface communicating with the shuttle valve hole. 
     The fluid pump lower component lower surface fluid path holes are directed in a downward orientation, taking fluid from, and returning fluid to, the shuttle valve. Each of the fluid path holes of the fluid pump lower component lower surface have an associated o ring. 
     The fluid pump has a pair of rotatably interlocking pump gears. The pump gears each have a central shaft. The central shaft of each of the pump gears being rotatably contained with the gear shaft holes of the fluid pump upper component and the gear shaft holes of the fluid pump lower component. the fluid pump interlocking pump gears are each contained within one of the overlapping gear recesses of the lower surface of the fluid pump upper component. Each central shaft of the interlocking pump gears have a hexagonally configured shaft hole there through. The fluid pump has a hexagonally shaped drive shaft. The drive shaft couples one of the interlocking pump gears with the motor output shaft. 
     There is a hydraulic cylinder. The hydraulic cylinder has an upper end, with an open upper extent, and a closed lower end with a piston passageway bottom. The hydraulic cylinder open upper end has an internal thread. The hydraulic cylinder piston passageway is round and is continuous, running from the open upper extent of the hydraulic cylinder to the closed lower end bottom of the hydraulic cylinder. 
     The hydraulic cylinder piston passageway has an upper region. The closed lower end bottom of the hydraulic cylinder forms a solid cylinder base. The hydraulic cylinder has a piston passageway wall, with the wall having a length. The piston passageway wall of the hydraulic cylinder has an upper end fluid passageway there in. The upper end fluid passageway runs from a fluid passageway opening, which is located in the upper region of the hydraulic cylinder piston passageway, to the cylinder base of the hydraulic cylinder, thereby forming a cylinder base opening, where the upper end fluid passageway is operatively coupled to the first fluid path hole of the inward left side of the cylinder mounted reservoir base plate. 
     The piston passageway of the hydraulic cylinder has a lower end fluid passageway there in, with the lower end fluid passageway running from the bottom of the hydraulic cylinder piston passageway to the cylinder base of the hydraulic cylinder, where the lower end fluid passageway is operatively coupled to the second fluid path hole of the inward left side of the cylinder mounted reservoir base plate. The cylinder base has a single downwardly projected mounting tab with a bolt hole there through. The cylinder base has a pair of reservoir base plate mounting bolt holes which run there through, for coupling the hydraulic cylinder to the cylinder mounted reservoir base plate. The hydraulic cylinder reservoir base plate mounting bolt holes are sized to receive the cylinder mounting bolts. 
     The hydraulic cylinder has an end cap. The end cap has an aperture there through. The end cap has an external thread which is sized to be threadedly received by the internal thread of the hydraulic cylinder open upper end. The hydraulic cylinder has an associated ram shaft. The hydraulic cylinder ram shaft has a lower end with an associated piston coupled thereto. The hydraulic cylinder piston has an associated o ring. The ram shaft passes through the aperture of the end cap. The ram shaft has an upper end with a mounting hole there through. 
     There has thus been outlined, rather broadly, the more important features of the invention in order that the detailed description thereof that follows may be better understood and in order that the present contribution to the art may be better appreciated. There are, of course, additional features of the invention that will be described hereinafter and which will form the subject matter of the claims attached. 
     In this respect, before explaining at least one embodiment of the invention in detail, it is to be understood that the invention is not limited in its application to the details of construction and to the arrangements of the components set forth in the following description or illustrated in the drawings. The invention is capable of other embodiments and of being practiced and carried out in various ways. Also, it is to be understood that the phraseology and terminology employed herein are for the purpose of descriptions and should not be regarded as limiting. 
     As such, those skilled in the art will appreciate that the conception, upon which this disclosure is based, may readily be utilized as a basis for the designing of other structures, methods and systems for carrying out the several purposes of the present invention. 
     It is important, therefore, that the claims be regarded as including such equivalent constructions insofar as they do not depart from the spirit and scope of the present invention. 
     It is therefore an object of the present invention to provide a new and improved Hydraulic Cylinder Assembly which has all of the advantages of the prior art electric hydraulic cylinders and none of the disadvantages. 
     It is another object of the present invention to provide a new and improved Hydraulic Cylinder Assembly which may be easily and efficiently manufactured and marketed. 
     It is further object of the present invention to provide a new and improved Hydraulic Cylinder Assembly which is of durable and reliable constructions. 
     An even further object of the present invention is to provide a new and improved Hydraulic Cylinder Assembly which is susceptible of a low cost of manufacture with regard to both materials and labor, and which accordingly is then susceptible of low prices of sale to the consuming public, thereby making such Hydraulic Cylinder Assembly economically available to the buying public. 
     Even still another object of the present invention is to provide a Hydraulic Cylinder Assembly having an offset hydraulic pump and reservoir. 
     Lastly, it is an object of the present invention to provide a new and improved Hydraulic Cylinder Assembly having a free-floating motor and pump, comprising a motor, and a hydraulic fluid reservoir coupled to the motor. 
     There is a reservoir base plate having a pair of fluid path holes therein which run there through. The base plate has a mounting stud. There is an intermeshed gear fluid pump having a pair of downwardly directed inflow/outflow holes. The single mounting tab allows the easy placement or removal of the assembly into an operating location. 
     It should be understood that while the above-stated objects are goals which are sought to be achieved, such objects should not be construed as limiting or diminishing the scope of the claims herein made. 
     These together with other objects of the invention, along with the various features of novelty which characterize the invention, are pointed out with particularity in the claims annexed to and forming a part of this disclosure. For a better understanding of the invention, its operating advantages and the specific objects attained by its uses, reference should be had to the accompanying drawings and descriptive matter in which there is illustrated preferred embodiments of the invention. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The invention will be better understood and objects other than those set forth above will become apparent when consideration is given to the following detailed description thereof. Such description makes reference to the annexed drawings wherein: 
         FIG. 1  is front plan view of the Hydraulic Cylinder Assembly; 
         FIG. 2  is a rear plan view of the invention; 
         FIG. 3  is a left side plan view of the invention; 
         FIG. 4  is a right side plan view of the invention with the bolts holding the motor to the reservoir being shown in phantom; 
         FIG. 5  is a top plan view of the invention; 
         FIG. 6  is a bottom plan view of the invention; 
         FIG. 7  is a cut away view showing the internal components of the Hydraulic Cylinder Assembly; 
         FIG. 8  is an exploded view of the components of the invention; 
         FIG. 9  is a view taken along line  9 - 9  of  FIG. 8 ; 
         FIG. 9A  is a view taken along line  9 A- 9 A of  FIG. 8  with the fluid pathways and the shuttle valve hole being shown in phantom; 
         FIG. 10  is a view taken along line  10 - 10  of  FIG. 9A  with the bolt holes and threaded bolt holes for coupling the upper and lower pump components, being shown in phantom; 
         FIG. 11  is a view taken along line  11 - 11  of  FIG. 10  with the shuttle hole and fluid passageways being shown in phantom. Note the drill holes from the right side, which are plugged after connecting the fluid pathways; 
         FIG. 12  is a view taken along line  12 - 12  of  FIG. 11  with the fluid pathways being shown in phantom wherein the fluid leaves the area of the gears and is pushed downward into the shuttle valve hole; 
         FIG. 13  is a view taken along line  13 - 13  of  FIG. 8  with the fluid pathways of the hydraulic cylinder being shown in phantom, along with part of the base plate so as to show the continuous relationship of the fluid passageways through those elements of the assembly; 
         FIG. 14  is a cross section of the hydraulic cylinder; 
         FIG. 15  is a view taken along line  15 - 15  of  FIG. 11 ; 
         FIG. 16  is a view taken along line  16 - 16  of  FIG. 8  with the flow regulator hole and the fluid passageways, first and second fluid passageways being shown in phantom. Also shown in phantom are the bolt holes for coupling the cylinder to the base plate; 
         FIG. 17  is a perspective view of the base plate with fluid passageways and flow regulator hole being shown in phantom. 
     
    
    
     The same reference numerals refer to the same parts throughout the various Figures. 
     DESCRIPTION OF THE PREFERRED EMBODIMENT 
     With reference now to the drawings, and in particular to  FIG. 1  thereof, the preferred embodiment of the new and improved Hydraulic Cylinder Assembly embodying the principles and concepts of the present invention and generally designated by the reference numeral  10  will be described. 
     The present invention, the Hydraulic Cylinder Assembly  10  is comprised of a plurality of components. Such components in their broadest context include a motor, a reservoir, a fluid pump and a hydraulic cylinder. Such components are individually configured and correlated with respect to each other so as to attain the desired objective. 
     A hydraulic cylinder assembly having a free-floating motor and pump  10  is herein described. The hydraulic cylinder assembly having a free-floating motor and pump comprises several components, in combination 
     First there is a motor  12 . The motor has a housing  14 , with the housing having an upper extent  16  and a lower extent  18 . The motor housing has a pair of mounting bolt holes  20  there through. The motor has an output shaft  22 , with the output shaft having an upper end  24  and a lower end  26 . The lower end of the motor output shaft has a hexagonally shaped recess  28  therein. 
     There is a power source  30  which is operatively coupled to the motor. 
     There is a hydraulic fluid reservoir  32 . The hydraulic fluid reservoir has a front wall  34 , a rear wall  36 , a right side wall, and a left side wall  40 . The front wall is continuous with the right side wall and the left side wall. The rear wall is continuous with the left side wall and the right side wall. The walls collectively form a fluid holding volume  42  therein. The right side wall has a fill plug opening  44 , with the fill plug opening having an associated fill plug  46 . 
     The hydraulic fluid reservoir has an open upper end  48  with an upper flange  50 . The upper flange of the hydraulic fluid reservoir has a pair of threaded motor mounting bolt holes  52  there in. The upper flange of the hydraulic fluid reservoir has a pair of motor mounting bolts  54 , which pass through the motor housing, and couple the motor to the upper flange of the hydraulic fluid reservoir. 
     The hydraulic fluid reservoir has an open lower end  56 , with the lower end of the hydraulic fluid reservoir having a lower flange  58 . The lower flange of the hydraulic fluid reservoir has four corners  60 , with each of the four corners of the hydraulic fluid reservoir lower flange having an attachment bolt hole there through  62 . Each hydraulic fluid reservoir lower flange bolt hole has an associated lower flange bolt  64 . 
     There is a cylinder mounted reservoir base plate  66  which has a generally rectilinear configuration. The cylinder mounted reservoir base plate has an upper surface  68  and lower surface  70 , with a thickness there between. The thickness of the cylinder mounter reservoir base plate forms a peripheral edge  72 . The peripheral edge of the cylinder mounted reservoir base plate has a outward right side  74 , an inward left side  76 , a front side  78 , and a rear side  80 . The inward left side of the cylinder mounter reservoir base plate has a pair of threaded bolt holes  82  there in, with a pair of associated cylinder mounting bolts  84 . 
     The inward left side has a pair of fluid path holes therein, being a first fluid path hole  86  and a second fluid path hole  88 . Each fluid path hole has an associated o ring  90 . The inward left side of the base plate  66  has a mounting stud  92  protruding from a mounting stud hole in the base plate  66 . The mounting stud  92  has an associated o ring  94 . 
     The base plate  66  has four threaded mounting bolt holes  96  there through. The four threaded mounting bolt holes are sized to threadedly receive each of the four lower flange bolts. The base plate  66  threaded mounting holes  96  run from the upper surface of the reservoir base plate  68  to the lower surface of the reservoir base plate  70 . 
     The reservoir base plate  66  has a flow regulator hole  98  there through. The flow regulator hole  98  runs through the reservoir base plate from the outward right side of the base plate  74  to the inward left side of the base plate  76 . The flow regulator hole  98  commences at the outward right side of the base plate  74  and has a partially threaded first internal dimension  100 . The flow regulator hole  98  also has a tapered section  102 . The flow regulator hole  98  has a second internal dimension  104 , with the second internal dimension being less than the first internal dimension. 
     The tapered section  102  of the flow regulator hole is continuous from the first internal dimension to the second internal dimension. The flow regulator hole  98  runs through the base plate from the outward right side of the base plate  74  to the inward left side of the base plate  76 . The inward left side flow regulator hole has the second internal dimension. 
     The flow regulator hole  98  of the reservoir base has an associated flow regulator  104 . The flow regulator  104  has a threaded outward end  106  having a first external dimension, with a retention clip groove  108 , having an associated retention clip  110 . The flow regulator  104  has a plurality of o ring grooves  112 , with associated o rings  114 . The flow regulator has a right outward end  116 . The first external dimension thread of the flow regulator  104  being sized to mate with and be threadedly received within the right outward end thread of the flow regulator hole  98 . The flow regulator  104  has a middle section  118 , with the middle section having an external diameter configured as a taper, with the taper of the middle section sized to fit within the taper internal dimension of the flow regulator hole. The flow regulator hole  98  has an inward left end  120  which has a second internal dimension. The second external dimension of the flow regulator is sized to fit within the second internal dimension of the flow regulator hole. The second external dimension of the flow regulator is less than the first external dimension of the flow regulator. 
     The fluid reservoir base plate  66  has a pair of fluid path, being a first fluid path  122  and a second fluid path  124 . The first fluid path runs from the upper surface of the base plate to the left inward surface of the base plate, thereby forming the base plate first fluid path hole which is located on the left inward surface end  126  of the first fluid path. The first fluid path left inward surface end has an o ring groove with an associated o ring  90 . The second fluid path  124  runs from the upper surface of the base plate to the left inward surface of the base plate, thereby forming the base plate second fluid path hole  128  which is located on the left inward surface end of the second fluid path. The second fluid pathway left inward surface end has an o ring groove with an associated o ring  91 . The second fluid path meets and joins the flow regulator hole, which allows the regulation of fluid flow through the base plate. 
     There is a fluid pump  130 . The fluid pump has an upper component  132  and a lower component  134 . The upper component  132  has an upper surface  136  and a lower surface  138 , with a thickness  140  there between. The fluid pump upper component  132  has a plurality of coupling bolt holes  138  there through with associated upper component coupling bolts  139 . The fluid pump upper component has a pair of gear shaft holes  142  there through. The lower surface of the fluid pump upper component has a pair of overlapping gear recesses  144 . The gear recesses each have an intersecting portion  146 . 
     The lower surface  138  of the fluid pump upper component has a pair of fluid grooves  148 . The fluid grooves of the fluid pump upper component lower surface  138  connect to the intersection portion of the gear recesses  146  of the fluid pump upper component lower surface  138  and the first fluid path pickup and delivery hole  149  and the second fluid path pickup and delivery hole  151 . 
     The fluid pump lower component  134  has an upper surface  148  and a lower surface  150 , with a thickness  152  there between. The thickness of the fluid pump lower component forms four side edges, being a right side edge  154 , a left side edge  156 , a forward edge  158 , and a rearward edge  160 . The fluid pump lower component forward edge  158  and the fluid pump lower component rearward edge  160  each have a communicating fluid shuttle valve hole  162  there through. The fluid shuttle valve hole  162  has a stepped configuration. The fluid shuttle valve hole  162  has an associated fluid shuttle valve  164 , with a pair of fluid shuttle valve hole plugs  166 . The fluid shuttle valve comprises a pair of opposed springs, a pair of opposed needle valves, a pair of opposed shuttle valve seats, and a centrally located shuttle. Each of the fluid shuttle valve hole plugs has a slot  168  therein. Each fluid shuttle valve hole plug has an associated o ring. 
     The fluid pump lower component has a plurality of threaded coupling bolt holes  170  there through. Each of the threaded coupling bolt holes of the fluid pump lower component have an associated coupling bolt  172 . The fluid pump lower component has a pair of gear shaft holes  174  there through. The lower surface of the fluid pump upper component has a plurality of base plate mounting bolt holes  176  there through. 
     The fluid pump lower component has a pair of ball check valves  178  comprising a ball seat  180  and a ball  182 , for permitting one way flow of fluid through the pump. The check valves are located in fluid pickup and delivery holes  149  and  151 . This allows fluid to be drawn into the pump, or pressured from the reservoir into the pump, via the fluid pickup and delivery holes, with the check valves only permitting fluid to enter the pump when the fluid pressure within the reservoir is either greater than or equal to the pressure within the pump, so as to prevent cavitation on the feed side of the gear combination. When the pump pressure increases on one side of the pump gears, the check valve on that side of the pump is pressurized and forced closed. If, on the other side of the pump, the fluid is pulled away from the gears, and the pressure on that side of the gears is lower than the reservoir pressure, such as is present in cavitation, the check valve is pulled open, and fluid enters the pump from the reservoir. 
     The upper surface of the fluid pump lower component has a pair of lower component shuttle valve delivery fluid path holes  184  there in, with each lower component shuttle valve delivery fluid path hole having an associated linear recess  186 . Each of the lower component shuttle valve delivery fluid path holes is continuous with one of the pair of fluid pump lower component shuttle valve delivery fluid paths. The fluid pump lower component shuttle valve delivery fluid paths, being the lower component first shuttle valve delivery fluid path  187  and the lower component second shuttle valve delivery fluid path  189 , run from the lower component upper surface to the lower component lower surface and are downwardly directed into the shuttle valve hole  162 , and shuttle valve  164 . 
     The fluid path holes of the lower component upper surface  184  communicate through the lower component first fluid path  187  and the lower component second fluid path  189  with the shuttle valve hole  162 . The fluid pump lower component lower surface has a pair of fluid path holes, being a fluid pump lower component lower surface first fluid path hole and a  190  and a fluid pump lower component lower surface second fluid path hole  191 , with the fluid path holes of the fluid pump lower component lower surface communicating with the shuttle valve hole. 
     The fluid pump lower component lower surface fluid path holes  190  and  191  are directed in a downward orientation, taking fluid from, and returning fluid to, the shuttle valve  164 . Each of the fluid pathway holes of the fluid pump lower component lower surface have an associated o ring  192 . 
     The fluid pump has a pair of rotatably meshing pump gears  194 . The pump gears each have a central shaft  196 . The central shaft of each of the pump gears being rotatably contained with the gear shaft holes  142  of the fluid pump upper component and the gear shaft holes of the fluid pump lower component  198 . The fluid pump meshing pump gears are each contained within one of the overlapping gear recesses  144  of the lower surface of the fluid pump upper component. Each central shaft of the meshing pump gears have a hexagonally configured shaft hole  200  there through. The fluid pump has a hexagonally shaped drive shaft  202 . The drive shaft couples one of the meshing pump gears with the motor output shaft. 
     There is a hydraulic cylinder  204 . The hydraulic cylinder has an upper end  206 , with an open upper extent  208 , and a closed lower end  210  with a piston passageway  212  bottom  214 . The hydraulic cylinder open upper end  206  has an internal thread  216 . The hydraulic cylinder piston passageway  212  is round and is continuous, running from the open upper extent  208  of the hydraulic cylinder to the closed lower end bottom  214  of the hydraulic cylinder. 
     The hydraulic cylinder piston passageway  212  has an upper region  218 . The closed lower end bottom of the hydraulic cylinder being forms as a solid cylinder base  220 . The hydraulic cylinder has a piston passageway wall  222 , with the wall having a length. 
     The piston passageway wall of the hydraulic cylinder has an upper end fluid passageway  224  there in. The upper end fluid passageway runs from a fluid passageway opening  226 , which is located in the upper region of the hydraulic cylinder piston passageway, to the cylinder base of the hydraulic cylinder, thereby forming a cylinder base opening  228 , where the upper end fluid passageway is operatively coupled to the first fluid path hole  126  of the inward left side of the cylinder mounted reservoir base plate. 
     The piston passageway of the hydraulic cylinder has a lower end fluid passageway  230  there in, with the lower end fluid passageway running from the bottom of the hydraulic cylinder piston passageway to the cylinder base of the hydraulic cylinder, where the lower end fluid passageway is operatively coupled to the second fluid path hole  128  of the inward left side of the cylinder mounted reservoir base plate. The cylinder base has a single downwardly projected mounting tab  232  with a bolt hole  234  there through. The cylinder base has a pair of reservoir base plate mounting bolt holes  236  which run there through, for coupling the hydraulic cylinder to the cylinder mounted reservoir base plate  66 . The hydraulic cylinder reservoir base plate mounting bolt holes are sized to receive the cylinder mounting bolts. 
     The hydraulic cylinder has an end cap  238 . The end cap has a ram shaft aperture  240  there through. The end cap has an external thread  242  which is sized to be threadedly received by the internal thread of the hydraulic cylinder open upper end. The hydraulic cylinder has an associated ram shaft  244 . The hydraulic cylinder ram shaft has a lower end  246  with an associated piston  248  coupled thereto. The hydraulic cylinder piston has an associated o ring  250 . The ram shaft passes through the aperture of the end cap. The ram shaft has an upper end with a mounting hole  252  there through. 
     In operation a current is delivered to the motor, which turns the motor shaft, and, in turn, rotates the hexagonal shaft which couples the motor and the meshed gears, turning the gears inside of the pump. 
     The gears in meshed, so the turning of the drive gear in one direction, turns the other gear in an opposite direction. If the drive gear turns in a clockwise direction, the other gear turns in a counter clockwise direction. 
     In the case of a dry start-up, with the drive gear rotating in a counterclockwise direction, the gears move air in the pump through the upper component recess. This causes a negative pressure in the pump, and the hydraulic fluid is drawn up the first pick up hole  149  check valve  178  on the lower surface of the lower pump component. The fluid is drawn through the groove  148  of the upper component, lower surface, of the pump and into the gear recess. The gears then push the fluid in the direction of rotation and each gear delivers the fluid to the opposite side of the pump, causing the pressure to build on the opposite side, thereby causing the fluid to move down the second fluid path hole  189 . The fluid travels through second fluid path  189  to the shuttle valve, where the pressure building up on one side of the valve shifts the valve so that the fluid flow is determined to be in one direction. The fluid exits the shuttle valve hole  191  and the fluid enters the base, being directed through the second fluid path of the base, into the hydraulic cylinder, where the piston is either moved in an upward direction. 
     As the cylinder piston  248  moves upward, the air in the cylinder is compressed and then displaced. The compressed air moves through the opening in the upper portion of the cylinder wall  226  and into the first fluid path through the cylinder wall  224 , into the base plate first fluid path  122 . The pressurized air moves through the base plate to the lower surface of the lower component of the pump, where it enters the pump shuttle valve, which has been moved to allow fluid to enter the second fluid path. The shuttle valve allows the air to move through the valve and into the pump lower component first fluid path  187 , into the gear recess. The fluid being delivered into the gear recess pushes the air outward, toward the ball check valve, which allows air to move through the closed ball valve, into the reservoir, thereby bleeding the cylinder and pump of air. 
     When the system is bled of air, the returning fluid would not move through the check valve, but would be used to load the gear pump with fluid, essentially acting as a charging system for the fluid pump. 
     The non fluid pressurized fluid path allows fluid to return back through the cylinder fluid path, to the base and upward, into the shuttle valve, where it is directed upwards to the lower surface of the pump. The check valve in the pump allow the fluid in the pump to be equalized with the return fluid pressure in the pump. The returning fluid also helps load the pump gear with fluid, thereby enhancing the intermeshed gear pump efficiency. 
     As to the manner of usage and operation of the present invention, the same should be apparent from the above description. Accordingly, no further discussion relating to the manner of usage and operation will be provided. 
     With respect to the above description then, it is to be realized that the optimum dimensional relationships for the parts of the invention, to include variations in size, materials, shape, form, function and manner of operation, assembly and use, are deemed readily apparent and obvious to one skilled in the art, and all equivalent relationships to those illustrated in the drawings and described in the specification are intended to be encompassed by the present invention. 
     In use, the single mounting tab allows the hydraulic pump to be installed or removed without having to depressurize the pump, or compress the cylinder. In two mounting tab devices, the pump has to be lifted off of the mounting member to facilitate removal. With a single mounting tab, the pump can be simple pulled from the mount, without having to move the cylinder ram so as to allow upward or downward movement of the pump during removal. This provides an advantage in mounting situations where space is limited, and such movement might be not easily accomplished. The tab secures the pump in location and provides a direct line of force for the operation of the hydraulic cylinder. 
     Therefore, the foregoing is considered as illustrative only of the principles of the invention. Further, since numerous modifications and changes will readily occur to those skilled in the art, it is not desired to limit the invention to the exact construction and operation shown and described, and accordingly, all suitable modifications and equivalents may be resorted to, falling within the scope of the invention.