Abstract:
The trolley includes a member which supports the shoe of a loaded rack. The member has a horizontal limb which extends beneath the shoe and first and second housings each having vertically adjustable casters. One of the housings is connected to the member while the other has a clamp for attaching the housing to the horizontal limb of the member. As the casters descend, the shoe rises with resulting raising of the foot from the floor on which the rack rests.

Description:
This application claims priority pursuant to 35 U.S.C. 119 based on Canadian application No. 2,645,261, filed Nov. 26, 2008, which application is incorporated herein by reference in its entirety. 
     FIELD OF THE INVENTION 
     This invention relates to trolleys for carrying loads and more particularly to a trolley that comes apart for mounting beneath a loaded rack and reassembles to form a conveyance for transporting the rack while it remains loaded from one location to another. 
     BACKGROUND OF THE INVENTION 
     Racks for holding or storing items can be extremely heavy when fully loaded. They are usually quite safe as long as they are not moved but if they are moved, they become unstable and susceptible to toppling over. If they do topple over, the items on the rack are usually damaged or soiled and the racks themselves are damaged beyond repair. Moreover, because the racks are so unstable when they are being moved, they may suddenly, without warning, fall and cause injury or even death to a person in the path of the falling rack. 
     To avoid the risk of a rack toppling over during transport, a rack is usually unloaded before it is moved. Unloading and then reloading a fully loaded rack is very time consuming. As well, items on the rack may be mixed up at this time and further time must be spent in checking the items as they are being placed back on the rack to ensure that the items are in their rightful place. 
     We have invented a trolley that is designed to carry a heavily loaded rack. There is no necessity to move any of the items on the rack before the trolley is attached or while the rack is moved on the trolley. As well, there is no possibility that any of the items on the rack may be mixed up as a result of the move since the items are not moved from the rack during the move. 
     SUMMARY OF THE INVENTION 
     Briefly, the trolley of my invention includes a member which supports the shoe of a rack. The shoe-supporting member has a horizontal limb which extends beneath the shoe and first and second housings each having vertically adjustable wheels or casters. One of the housings is connected to the shoe-supporting member while the other has a clamp for attachment to the horizontal limb of the shoe supporting member. As the wheels or casters descend, the shoe supporting-member rises with resulting raising of the foot from the floor on which the rack rests. The trolley will then be resting on the wheels or casters and the rack can be moved by pushing or pulling it. 
    
    
     
       DESCRIPTION OF THE DRAWINGS 
       The trolley of the invention is described with reference to the accompanying drawings in which: 
         FIG. 1  is a front elevation of a shoe-supporting member of the trolley in conjunction with the lower portion of a conventional rack for storing or holding objects; 
         FIG. 2  is a side elevation of the shoe-supporting member; 
         FIG. 3  is a plan view of both the shoe-supporting member; 
         FIG. 4  is an elevation of the shoe-supporting member in the process of being placed beneath the shoe of a rack; and 
         FIG. 5  is an elevation of the shoe-supporting member in which the first and second wheeled housings are interconnected. 
     
    
    
     DESCRIPTION OF PREFERRED EMBODIMENTS 
     With reference to  FIG. 1 , a shoe-supporting member of the trolley, generally  10 , is shown attached to the lower portion of a conventional rack generally  12 . The rack is composed of a pair of spaced apart uprights  14 , one of which being illustrated, to which a number of shelves  16  are removably attached. The lower end of each upright is attached to a shoe  18  which extends horizontally outward from opposite sides of the upright. Feet  20   a,b  are threadably attached to the shoe adjacent to its ends. 
     Each foot has a plate  22  which contacts a floor unless the rack is raised by the trolley of the invention in the manner described below. Extending upward from the plate is a threaded rod  24  which is attached to the shoe. As is conventional, when the rod is rotated, the level of the shoe either rises above a floor or descends toward the floor. 
     With reference to  FIGS. 1 ,  2  and  3 , the shoe-supporting member  10  has an L-shaped or angular member, generally  26  having a horizontal limb  30  and vertical limb  32 . As illustrated in the Figures, the horizontal limb is in the form of a solid plate. Attached to the vertical limb adjacent to each of its ends a first wheeled housing, generally  34 . The housing consists of a vertical plate  34   a  and an ear  34   b  to which a threaded vertically extending rod  36  is threadedly attached. A first caster or wheel  38  is attached to the lower end of each rod and is free to rotate and to swivel. A hexagonal nut  40  contacts the upper wall of each housing and is threadedly attached to the rod. Rotation of the nut causes the wheels or caster to rise and fall relative to the housing. 
     While the trolley of the invention can ride on either a simple wheel that does not swivel or a caster that does, a caster is preferred since a trolley equipped with castors is more easily turned than a trolley that is not. Henceforth the term “caster” will be used to describe the wheels on which the trolley of the invention rides but it is to be understood that the wheels can also be a simple wheels that do not swivel. 
     The L-shaped or angular member is slightly shorter than the distance between feet  20   a,b  so that wheeled housings  40  are adjacent to the two feet when connected to the shoe as described below. 
     A second wheeled housing, generally  50 , has a jaw, generally  52 , consisting of a pair of spaced apart upper and lower horizontal plates  52   a,b  attached to a vertical plate  54 . A bolt  56  serves to removably attach the second wheeled housing to the horizontal limb. In this connection, a threaded opening is formed in both the upper plate  52   a , and in the horizontal limb  30 . When the bolt is turned until it passes through both openings and into contact with the upper face of the lower plate  52   b , the two wheeled housings  34 ,  50  are interconnected. Further turning of the bolt causes horizontal limb  30  to rise in the manner described below. 
     As the horizontal limb rises it comes into contact with the lower face of the upper plate  52   a  with resulting clamping of the limb to the second wheeled housing  50 . Loosening of the bolt causes it to move out of the opening in the horizontal limb so that the second wheeled housing can be separated from the horizontal limb. 
     The second wheeled housing  50 , like the first wheeled housing has a vertical member  54  to which an ear  60  is attached. A threaded vertical rod  62  is threadably attached to the ear and a second caster  64  is attached to the lower end of the rod while a hexagonal nut  66  serves to adjust the elevation of caster  64  relative to the ear. 
     The operation of the trolley is described with reference to  FIGS. 3-5 . With reference first to  FIG. 4 , the trolley is attached to the rack by first inserting the horizontal limb  30  of the shoe-supporting member into the space between shoe  18  and a floor  70 . The two first wheeled housings  34  at opposite ends of the horizontal limb should then be adjacent to a separate foot  20  of the rack and the two wheeled housings should be between the feet of the rack. 
     The feet of conventional racks are usually spaced about 3 feet apart. The first wheeled housings must fit between the feet and should be about 2′-6″ apart. If the trolley of the invention is used to move racks in which the spacing between the feet is different from the conventional spacing, plates  34   a  of the housings should not be permanently attached to vertical limb  32  but should be bolted to it so that the spacing between the housings can be adjusted. 
     Two second wheeled housings  50  are then positioned adjacent to the first wheeled housings  34  as illustrated in  FIGS. 3 and 5  so that jaws  52  are adjacent to the forward edge of the horizontal limb  30  and each second wheeled housing is aligned with a separate first wheeled housing. 
     The next step is to raise the forward edge of the horizontal limb to the level of the space between the two plates  52   a,b . That step can be accomplished using a crowbar. The second castor housing is then advanced toward the first wheeled housing to move the forward edge of the horizontal limb into the space between the two plates. Bolt  56  is then tightened to clamp the two wheeled housings together. 
     Hexagonal nuts  40 ,  66  are then turned to lower first and second castors  38 ,  64 , respectively, until they contact the floor. They are further tighten to raise feet  20   a,b  of the rack off the floor as illustrated in  FIG. 1 . The weight of the rack is then borne by the four castors of the first and second wheeled housings. 
     The process is then repeated at the other end of the rack in order to raise the feet at that end off the floor. The rack is then wholly supported by two trolleys, one at each at each end of the rack. The rack is then ready to be transported to a new location. 
     It will be understood, of course, that modifications can be made in the structure of the trolley of the invention without departing from the scope of the invention as defined in the appended claims. For example, the shoe-supporting member can be attached to either the first or second wheeled housing, either permanently or temporarily, by means of bolts. The other wheeled housing can then be provided with a clamp so that both can be attached to the shoe-supporting member.