Abstract:
The disclosed embodiments relate to a drive-on leveling device that is adapted for single and tandem axle recreational trailers. It is placed beneath the trailer wheel that supports the weight of the vehicle, on the side that has the lower elevation. The leveling device&#39;s two-block assembly creates a level plane that is stationary. The incline block and chock block are each designed with tines that allow insertion into one another for quick leveling and chocking.

Description:
TECHNICAL FIELD 
     The disclosed embodiments relate to a drive-on leveling device that is adapted for single and tandem axle recreational trailers or vehicles. 
     BACKGROUND 
     Recreational trailers are frequently parked on sloping terrain comprised of dirt, gravel, sand or asphalt. Uneven ground results in one wheel of the trailer being lower than the opposite side. A level trailer is much more comfortable and usable with appliances, sink drains, tables, berthing, etc. 
     Today, as in the past, heavy and inconvenient hydraulic jacks are still used to level. Tall manual hydraulic bottle jacks are difficult to place under the trailer, and with unstable ground, tend to fall over. Even when the trailer is elevated with a jack, the wheels of the trailer need to be blocked with chocks to prevent movement. Because of constant movement of people within the trailer, there is also a tendency to cause jacks to fall. 
     SUMMARY 
     The purpose of the example embodiments is to provide an easier-to-use trailer leveling device made with blocks with opposing tines which create level height when placed together. The leveling device comes into use so as to create a flat level plane. 
     Another purpose of the device is to provide leveling at the same time as chocking of the wheel to prevent movement of the trailer. 
     Another purpose of the device is to simplify the leveling process with fewer steps of operation. 
     Another purpose of the device is to have a strong, lightweight, durable assembly block that can easily be transported. 
     Another purpose of the example embodiments is to use the incline block portion of the device to elevate the trailer tire while the tow vehicle is hitched to the trailer. Next, inserting the chock block behind the wheel on the ground completes the leveling process. 
     Another purpose of the device is to create a leveling block that requires no tools to operate. 
     Another purpose of the example embodiments is to prevent further movement of the trailer by creating a greater surface area on the bottom of the device. 
     Another purpose of the example embodiments is to provide a locking effect. Both blocks of the assembly use vertical tines and channels. When blocks are placed opposite each other and inserted together, they form a locking effect. The surfaces of the tines when exposed to the trailer weight create even pressure that is distributed over the ground, even if the ground surface is uneven. 
     Another purpose of the example embodiments is to allow slight movement in the tine assembly to create movement that conforms to subtle changes in ground surface irregularities. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       Embodiments illustrated by way of example and not limitation in the figures of the accompanying drawings, in which: 
         FIG. 1  illustrates an angle view of the incline block. 
         FIG. 2  illustrates a side view of the incline block. 
         FIG. 3  illustrates an angle view of the chock block. 
         FIG. 4  illustrates a side view of the chock block. 
         FIG. 5  illustrates the side view of the spacer block used with incline block. 
         FIG. 6  illustrates the top view of the spacer block used with the incline block. 
         FIG. 7  illustrates the side view of the spacer block used with the chock block. 
         FIG. 8  illustrates top view of the spacer block used with chock block. 
         FIG. 9  illustrates the side view of a wheel in the cradle of the trailer leveling device. 
     
    
    
     DETAILED DESCRIPTION 
     The disclosed embodiments relate to a drive-on leveling device that is adapted for single and tandem axle recreational trailers. However, it is understood that embodiments may be practiced without the specific details disclosed herein. In other instances, well-known processes, structures and techniques have not been shown in detail in order not to obscure the clarity of this description. Various embodiments are described below in connection with the figures provided herein. 
     Referring now to  FIGS. 1 through 9 , a leveling block assembly  8  uses a new concept which is different from prior leveling blocks for trailers. A combination of tines  24  with channels  26  between them are inserted, one into the other, of the opposing block. 
     Referring to  FIGS. 1 and 3 , the two-part leveling block assembly  8  consists of the tine incline block  10  and the tine chock block  12 . The tine incline block  10  and the tine chock block  12  are each comprised of a plurality of vertical blocks  14 . The vertical blocks  14  in the leveling device support the trailer weight much like a cattle guard or grate. 
     Referring again to  FIG. 1 , the incline block  10  is comprised of a plurality (e.g., three) of tine blocks  24  and a plurality (e.g., two) of spacer blocks  16  with a plurality (e.g., two) of one-centimeter (or other dimension) thick shims  18  positioned between the tine blocks  24  and the spacer blocks  16 . The shims  18  mirror the dimensions of the incline spacer blocks  16  and make entering of the tines  24  of the channels  26  of the opposing block easier. The incline block  10  has roughly a 15 degree incline  20  for the trailer wheel  22  to climb. It will be apparent to those of ordinary skill in the art that the incline angle of the incline block  10  can be a different angle and still be within the scope of the present disclosure. 
     In normal use, the incline block  10  can be positioned on the ground at a location where the user desires to lift or level a trailer or other wheeled apparatus. The user can drive or tow the trailer or other wheeled apparatus so that the wheels  22  of the trailer or other wheeled apparatus roll up the incline  20  of the incline block  10  to a desired height. When the wheel  22  is at the proper leveling height, the chock block  12  is inserted into the incline block  10 , interleaving the tines  24  and spaces  26  of the incline block  10  with the tines  24  and spaces  26  of the chock block  12  to lock and maintain the desired height of the wheel  22 . 
     Referring again to  FIG. 3 , the chock block  12  has a plurality (e.g., three) of tine blocks  24  and a plurality (e.g., two) spacer blocks  38 . A plurality (e.g., two) of shims  18  that mirror the dimensions of the spacer blocks  38  are placed into the chock block  12  assembly, positioned between the tine blocks  24  and the spacer blocks  16 . The spacer blocks  38  have a 15 degree down angle  40  (see  FIG. 7 ) to allow opposing tines  24  from the incline block  10  to insert completely into the spaces  26  of the chock block  12 . It will be apparent to those of ordinary skill in the art that the down angle  40  of the spacer blocks  38  can be a different angle and still be within the scope of the present disclosure. 
     The combination of the vertical blocks  14 , the spacer blocks  16 / 38 , and the shims  18  of the incline block  10  and the chock block  12  can be held together by at least one (e.g., two) lateral bolt, washers, and nuts  28 . In an example embodiment, the incline block  10  uses two ⅜″ bolts  30 , which are 6½″ in length. In an example embodiment, the chock block  12  uses two ⅜″ bolts  36 , which are 5½″ in length. In the example embodiment, all vertical blocks  14 , the spacer blocks  16 , and the shims  18  are drilled for assembly with ½″ holes. When the incline block  10  and the chock block  12  are assembled, they have enough clearance in the holes to allow slight movement of the tines  24 . This movement between the tines  24  allows slight adjustment of the incline block  10  and the chock block  12  to the irregular surface of the ground. Subtle movement between the incline block  10  and the chock block  12 , as assembled, creates a locking effect. This action helps cradle the trailer wheel  22  as shown in  FIG. 9 , thus preventing either loss of the level or movement of the wheel  22 . The leveling block assembly  8  works on asphalt, dirt, gravel, sandy ground, or any other type of even or uneven surface. The leveling block assembly  8  has a large surface area  34 , and a width at least as large as the width of wheel  22 , to transfer trailer weight to the ground. 
     In an example embodiment, the chock block  12  has an incline slope  32  of approximately 30 degrees, which keeps the wheel  22  from moving. In an example embodiment, the chock block  12  is about half the length of the incline block  10 . 
     In an example embodiment, the incline block  10  and the chock block  12  are fabricated from high density polyethylene plastic material (HDPE). The advantages of using this type of material are surprising strength, durability, and light weight construction. HDPE material is impervious to rain or pH of the soil conditions. In an example embodiment, the incline block  10  and the chock block  12  are fabricated from a material (e.g., an HDPE board) that is 1″ thick and 5½″ wide. In an example embodiment, the incline block  10  is 20″ in length, and the chock block  12  is 10″ in length. All hardware is steel, used in conjunction with washers and nylon insert nuts  28 . 
     The entire leveling block assembly  8  can be joined together with the lateral hardware bolts  30  and  36  and washers and nuts  28 . When tightening together each of the incline block  10  and the chock block  12  of the assembly  8 , the assembly should not be overly tightened. This slight slack allows both the vertical and horizontal movement of the tines  24 , which is beneficial for the leveling block assembly  8  so that the leveling block assembly  8  conforms to an uneven ground surface when the weight of the trailer wheel  22  is applied. When the vertical blocks  14  are placed together, their movement serves even more to lock the component parts of the leveling assembly block  8 . 
     The illustrations of embodiments described herein are intended to provide a general understanding of the structure of various embodiments, and they are not intended to serve as a complete description of all the elements and features of apparatus and systems that might make use of the structures described herein. Many other embodiments will be apparent to those of ordinary skill in the art upon reviewing the above description. Other embodiments may be utilized and derived therefrom, such that structural and logical substitutions and changes may be made without departing from the scope of this disclosure. The figures provided herein are merely representational and may not be drawn to scale. Certain proportions thereof may be exaggerated, while others may be minimized. Accordingly, the specification and drawings are to be regarded in an illustrative rather than a restrictive sense. 
     The description herein may include terms, such as “up”, “down”, “upper”, “lower”, “first”, “second”, “front”, “rear”, “top”, “bottom”, etc. that are used for descriptive purposes only and are not to be construed as limiting. The elements, materials, geometries, dimensions, and sequence of operations may all be varied to suit particular applications. Parts of some embodiments may be included in, or substituted for, those of other embodiments. While the foregoing examples of dimensions and ranges are considered typical, the various embodiments are not limited to such dimensions or ranges. 
     The Abstract is provided to comply with 37 C.F.R. §1.74(b) to allow the reader to quickly ascertain the nature and gist of the technical disclosure. The Abstract is submitted with the understanding that it will not be used to interpret or limit the scope or meaning of the claims. 
     In the foregoing Detailed Description, various features are grouped together in a single embodiment for the purpose of streamlining the disclosure. This method of disclosure is not to be interpreted as reflecting an intention that the claimed embodiments have more features than are expressly recited in each claim. Thus, the following claims are hereby incorporated into the Detailed Description, with each claim standing on its own as a separate embodiment. 
     Thus, a drive-on leveling device that is adapted for single and tandem axle recreational trailers is disclosed. While the present invention has been described in terms of several example embodiments, those of ordinary skill in the art can recognize that the present invention is not limited to the embodiments described, but can be practiced with modification and alteration within the spirit and scope of the appended claims. The description herein is thus to be regarded as illustrative instead of limiting.