the preferred embodiments of the present invention were developed in the context of treating cattle in a feedlot , and will be described in that context ; however , this description should in no way be considered limiting as to other applications of such a mobile treatment facility , such as in the raising of hogs , sheep , dairy cattle and the like . [ 0028 ] fig2 shows a perspective view of the preferred arrangement for the mobile cattle hospital 20 . in particular , the base structure of the mobile cattle hospital is a gooseneck trailer 22 . while it may be possible to build a mobile cattle hospital on a commercially available gooseneck trailer , in the preferred embodiments the trailer 22 has a width ( w in the figure ) of 12 feet , significantly wider than commercial gooseneck trailers for highway use , but slightly less than the standard 16 feet width of the alley 16 ( fig1 ) of most commercial feedlots . working cattle using the mobile cattle hospital of the preferred embodiment preferably involves forcing cattle , in single file , into the snake or offset walkway 24 . the offset walkway 24 leads from the back of the trailer 22 to the squeeze chute 26 . the offset walkway 24 is curved in an “ s ” shape in order to ease the cattle &# 39 ; s progression . likewise , the offset walkway 24 has a substantially “ v ” shape with the smaller portion being near the floor of the trailer 22 and the larger portion being near the top . in the perspective view of fig2 the squeeze chute 26 is shown only in rough outline . as one of ordinary skill in the art is aware , a squeeze chute is a device whereby a single animal is confined , within a “ v ” shaped structure . once the single animal is confined , the v closes slightly to immobilize the animal , hence the term “ squeeze chute ”, so that treatment may be performed . some squeeze chutes also have the capability of rotating about a horizontal axis , especially to allow treatment of hooves and the like . any suitable squeeze chute may be used , but the preferred embodiment comprises a squeeze chute manufactured by c & amp ; s of sublette , kans . once the treatment is complete , the animal is allowed to leave the squeeze chute 26 , continuing in a forward direction . in the preferred embodiments , the animal may exit the mobile cattle hospital either to the left or the right , as viewed from the back of the trailer 22 facing forward , by selective positioning of the gates 28 , 30 and 32 . [ 0031 ] fig3 a shows one arrangement for the gates 28 , 30 and 32 whereby an animal leaving the chute 26 exits to the left of the trailer 22 . allowing cattle to depart the squeeze chute with the gates as shown in fig3 a makes a small holding pen 34 between the center gate 30 and the right - hand gate 32 . fig3 b shows yet another configuration of the gates 28 , 30 and 32 in which the animal leaving the squeeze chute 26 is allowed to exit to the right of the trailer 22 , and in this case a small holding pen 36 is created by the position of the gates 28 and 30 . these holding pens 34 , 36 allow , for example , holding cattle that need to be segregated because of illness and the like . referring again to fig2 the preferred embodiments allow access to the squeeze chute along both sides . in particular , on the left side 38 , access may be had to the squeeze chute 26 by walkway 40 . access to walkway 40 in the preferred embodiments is by way of gate 42 . while gate 42 is shown in front of the wheels 44 , the gate 42 may be equivalently placed at any location , or not included at all , and these variations would be within the contemplation of this invention . likewise , on the right side of the trailer 46 , a walkway 48 exists alongside the squeeze chute 26 . access to walkway 48 preferably takes place through gate 50 . again , however , one of ordinary skill in the art could devise many equivalent locations for the gate to access the walkway 48 , and all of these would be within the contemplation of this invention . generally speaking , the walkways 40 and 48 are isolated from the cattle by means of a plurality of fence - like panels ( not specifically numbered ) shown on the outer edge of the trailer 22 . preferably the mobile cattle hospital 20 has cabinet space 52 , in the preferred embodiments located at the back right - hand side of the trailer . this cabinet space 52 preferably houses a computer 60 and related accessories , and also acts as working space for the persons performing treatment on the animals as they move through the squeeze chute 26 . the mobile cattle hospital 29 of the preferred embodiment also comprises an electrical power - generator 62 , preferably placed on the tongue section 54 of the trailer 22 , which provides power for lights ( not shown ), the computer 60 and any other electrically operated devices , such as electric saws for de - homing operations . the preferred embodiments also comprise a sink 64 in the cabinet area 52 , along with corresponding water tanks for storage of water for use with the sink . moreover , many of the medicines given to cattle musts be refrigerated , and thus the mobile cattle hospital of the preferred embodiment also comprises a refrigerator 66 , preferably located beneath the cabinet 52 . as one of ordinary skill in the art is aware , cattle , and possibly other animals , tend to resist movement if that movement involves climbing or descending steep slopes . the mobile cattle hospital 20 is preferably situated proximate to the pen of interest by rolling on wheels 44 , which implies that the frame of the trailer 22 may be several inches or even feet off the ground to accommodate relocation . once in place , the frame of the trailer 22 is adapted to rest substantially on the ground , thus requiring the cattle only to climb a vertical distance of only a few inches to be on the working deck on the same plane as walkways 40 and 48 . [ 0035 ] fig4 a and 4b show an elevational side view of the mobile cattle hospital 20 of the preferred embodiments with the various components mounted on the trailer not shown for clarity of the figure . in particular , fig4 a shows the trailer 22 mechanically connected to a tractor 56 and having a height h above the ground . preferably , the mobile cattle hospital 20 is moved from place to place while in the raised configuration . likewise , fig4 b shows the trailer 22 sitting substantially on the surface of the ground 58 . referring somewhat simultaneously to fig2 and 4b , in the preferred embodiments , the cattle need merely traverse the relatively small vertical distance ( approximately twelve inches ) from the ground 58 to the horizontal plane that comprises the walkways 40 and 40 a , as well as the bottom of the offset walkway 24 . preferably , a ramp hinges to the back of the trailer 22 and extends outward , minimizing slope of the path traveled by the cattle . the ramp , as well as a series of panels for creation of a squeeze pen , are discussed more fully below . referring still generally to fig4 a and 4b , in the preferred embodiments the mobile cattle hospital 20 is moved from place to place by means of the tractor 56 . because in the preferred embodiments the trailer 22 sits substantially on the ground along its length , not only do the wheels 44 of the preferred embodiment selectively move up and down to raise and lower the trailer , but also the tractor 56 correspondingly raises and lowers the tongue 54 . raising and lowering the trailer of the preferred embodiments takes place by hydraulically operating the wheels 44 of the trailer 22 . [ 0037 ] fig5 a shows the preferred lifting structure for one set of wheels 44 . in particular , fig5 a shows the wheels 44 in their raised or retracted position . preferably , a hydraulic cylinder 80 acts to raise and lower the wheels on one side of the trailer . thus , in the preferred embodiments , there will be a hydraulic cylinder 80 associated with each set of wheels 44 . the hydraulic cylinder 80 mechanically connects to movable member 82 . movable member 82 comprises a substantially horizontal component , as well as two substantially vertical components 84 a , b , which mechanically couple to the wheels 44 . the wheels 44 are rotatably coupled to the movable member 82 . each of the substantially vertical portions 84 a , b of the movable member 82 are slidingly within the stationary structure 86 , which preferably connects to the frame 88 of the trailer 22 . fig5 b shows the preferred implementation with the wheels 44 in their down or extended orientation . preferably , cylinder 80 pulls the movable member 82 downward ( which then raises the trailer 22 upward ) such that the wheels 44 contact the ground 58 and raise the trailer . fig6 shows an exemplary hydraulic system setup to perform this raising and lowering operation in the preferred embodiments . in particular , a pump 100 preferably takes sections from a reservoir 90 . the pump feeds a valve system 102 , which then fluidly couples the hydraulic fluid , under pressure of the pump 100 , to the appropriate side of the cylinders 80 . the preferred arrangement is having the cylinders operate in parallel from a single source . as hydraulic fluid enters one side of the parallel operating sets of cylinders 80 , the fluid is allowed to exit the other side , through the valve system 102 , and is allowed to flow back to the reservoir 90 . lowering the trailer 22 of the preferred embodiment involves forcing fluid into the cylinders 80 such that the cylinders extend in length , again by forcing fluid into one side of the hydraulic cylinder while allowing fluid from the second side to return to the reservoir 90 . as depicted in fig4 a , b , preferably the trailer 22 mechanically couples to a tractor 56 for movement about the feed lot and placement proximate to a pen of cattle that need treatment . in the preferred embodiments , the reservoir 90 , hydraulic pump 100 and valving arrangement 102 are all an integral part of the tractor 56 ; however , it would be an operable system to have an independent reservoir 90 , pump 100 and valving system 102 mounted on the trailer such that raising and lowering could be accomplished without the aid of a tractor 56 , and thus moving the trailer 22 from location to location could be done with some other vehicle , such as a truck . the hydraulic pump 100 , in this circumstance , could be gasoline operated , operated from the alternating current generated by the preferred electrical generator 62 , or could operate from battery power . alternatively , the truck used to relocate the trailer could have a power - take - off ( pto ) unit capable of providing hydraulic fluid under pressure . as mentioned above , the mobile cattle hospital 20 of the preferred embodiment also has a ramp leading to the offset walkway 24 and a series of panels connected to the back of the trailer 22 for on - location creation of a squeeze pen . referring now to fig6 there is shown an overhead view of the relationship of the ramp that leads to the offset walkway 24 , as well as the various panels connected to the back of the trailer that form the mobile squeeze pen . in particular , fig6 shows ramp 100 . ramp 100 is preferably hinged to the back of the trailer 22 , and extends from a surface substantially parallel to the walkways 40 , 48 to ground level 58 ( not shown in fig6 ). in the preferred operation where the mobile cattle hospital 20 sits substantially on the ground across its entire length , the vertical distance traversed by the ramp 100 is preferably only twelve inches or less ( the vertical height of the frame of the trailer 22 ). however , in circumstances where the mobile cattle hospital 20 is operated in a working alley having a slope , it is possible that this distance could increase , but it is minimized by the fact that the trailer 22 sits substantially on the ground as described with respect to fig4 and 5 . preferably , the mobile cattle hospital 20 has a series of fence panels mechanically connected to the back of the trailer 22 . the overhead view of fig6 shows those various fence panels in their extended position . in particular , along one side a series of two individual straight panels 102 and 104 couple to the back of the trailer 22 . because it is envisioned that the mobile cattle hospital 20 of the preferred embodiments may not be operated on entirely flat surfaces , not only are these panels hinged to fold away from the trailer 22 , but are also hinged to allow up and down movement to accommodate the particular terrain . in particular , panel 102 hinges to the trailer 22 , and panel 104 hinges to the panel 102 . a short panel 106 preferably hinges to panel 104 , and provides stability for gate panel 108 . preferably , panel 108 is hinged to panels 104 and 106 such that it can swing through at least an arc of ninety degrees . on the other side of the ramp 100 , a third and fourth straight panel 110 , 111 preferably hinge to the trailer 22 . two curved panels 112 and 114 preferably hinge to each other and to panel 111 . short panel 116 is preferably hinged to panel 114 , panel 116 providing horizontal support for the squeeze pen . finally , panel 118 preferably hinges to panels 114 and 116 to direct the cattle into the squeeze pen portion of the panels . as indicated in fig6 panel or gate 108 preferably swings within the area partially bounded by panels 112 and 114 , such in this set up a squeeze pen area 120 is created within the area bounded by the panels 104 , 108 , 112 and 114 , with the cattle being forced up ramp 100 to the offset walkway 24 ( not shown in fig6 ). fig7 shows the various fence panels 102 - 118 in their folded configuration , which is the preferred setup when the trailer is being relocated from pen to pen . as can be seen in fig7 the various straight fence panels 102 , 104 and 110 fold up to be substantially parallel to the width of the trailer . short panel 111 folds to be substantially parallel to the length of the trailer with circular panels 112 and 114 folding in on themselves to be the outermost panels , straight panel 118 and short panel 116 folding within the setup to be substantially parallel to the remaining fence panels 102 , 104 and 110 . preferably , the curved fence panel 112 and curved fence panel 114 coupled by way of an arm 115 coupled substantially in the center of panel 112 and hinged to the end of the curved panel 114 . in this way , the two curved panels 112 and 114 hinge to be substantially coaxial in the folded position . fig7 shows the relationship of panels 112 , 114 and arm 115 in a partially folded configuration to show the relationship of these various components . thus , the preferred embodiments comprise all the necessary equipment to perform cattle treating operations proximate to the pen of cattle , rather than having to move those cattle significant distances for cattle treating operations . further , the trailer 22 of the preferred embodiments is adapted to sit on the ground during treating operations , thus minimizing the vertical distance that the animals must climb when entering or exiting the trailer 22 . additionally , the mobile cattle hospital 20 of the preferred embodiments comprises the series of fence panels which are used to create a mobile squeeze pen for forcing the cattle through the offset walkway 24 . the above discussion is meant to be illustrative of the principles and various embodiments of the present invention . numerous variations and modifications will become apparent to those skilled in the art once the above disclosure is fully appreciated . for example , the mechanism for raising the lowering the wheels 44 shown in fig5 a , b is the preferred embodiment ; however , one of ordinary skill in the art now understanding how the trailer 22 of the preferred embodiment raises and lowers could device many equivalent systems for performing this task , such as air filled bladders , air operated shocks , mechanical ( non - hydraulic ) means such as motor operated jacks , and the like . it is intended that the following claims be interpreted to embrace all such variations and modifications .
the specification discloses a mobile cattle hospital that is adapted to be located near a pen of cattle for treatment operations . a gooseneck trailer forms a platform upon which various gates , fence panels , a squeeze chute , a squeeze pen and supplies are located for the treatment , or working , operations . the trailer is further configured to selectively raise and lower , sitting on the ground during working operations to make easier the movement of the cattle on and off the trailer .