Abstract:
A trailer for all terrain vehicles and/or snowmobiles for transporting injured persons from remote locations. Trailer has a frame of tubing, a main axle, spring and shock suspension, flotation type tires, IV pole with multiple mounting locations, carrier area for injured personnel transport, and accessory tube for attaching miscellaneous accessories.

Description:
BACKGROUND OF THE INVENTION 
   1. Field of the Invention 
   This invention relates generally to trailer apparatus and more particularly to an All Terrain Vehicle (ATV) or Snowmobile rescue trailer apparatus with extended versatility having transformation to fire suppression system, cargo carrier and other uses using rear accessory tube. 
   2. Description of Related Art 
   Various types of utility trailers have been developed for use with ATVs and snowmobiles depending on the task to be performed. ATV/snowmobile trailers differ from other types of trailers such as they may be towed by off road vehicles in that by their nature must be capable of a wide range of terrain; in many cases it is required to be towed over uncleared land. They are generally no wider than the towing ATV/snowmobile and must be tough enough to take substantial abuse while towing over uneven terrain. 
   Since ATVs/snowmobiles are commonly used for recreation, as well as work related tasks there have become more accidents that occur in areas that are inaccessible via a normal jeep, truck, tractor, etc. In the fire/rescue service there has been a greater use of all terrain vehicles (ATV&#39;s) and snowmobiles to access injured parties into areas not accessible by other means of transportation (e.g. forested, steep areas.) Many trailers pulled behind ATV&#39;s can access these areas but cannot be used for the safe transport of injured parties to awaiting medical services without extensive work to modify existing trailers or extra manpower to safely steady the injured party. 
   SUMMARY OF THE INVENTION 
   The invention is an ATV trailer which has a frame of steel tubing, round tube mounted in parallel for carrier area, a heavy duty main axle with a spring and shock suspension to which on each end is mounted wheels to traverse uneven terrain. The ATV trailer of the invention can be used to traverse uneven terrains while carrying an injured party to safety with minimal manpower, and can be used to aid in the fire service with other optional equipment. 

   
     BRIEF DESCRIPTION OF THE DRAWING 
       FIG. 1  shows a side view of the invention 
       FIG. 2  shows a top view of the invention 
       FIG. 3  shows a rear view of the invention 
       FIG. 4  shows a detail of the hitch assembly of the invention, taken from within the dashed circle denoted  4  in  FIG. 1   
       FIG. 5  shows a rear seat attachment for use with the invention 
       FIG. 6  shows a hose reel attachment for use with the invention 
       FIG. 7  shows the invention equipped with skis in place of wheels. 
   

   DETAILED DESCRIPTION OF THE INVENTION 
   The trailer ( 10 ) is constructed of structural shapes, which may be steel or aluminum or fiberglass etc. 
   As seen in  FIGS. 1 ,  2  and  7 , the trailer ( 10 ) has a main frame member ( 1 ) running from a hitch assembly ( 4 ) for connecting to an all-terrain vehicle or snowmobile or the like, which will be described in greater detail below, to the undercarriage assembly mounting point and accessories tube ( 8 ) at the rear of the trailer. The length of the main member ( 1 ) should be sufficient to support a standard Stokes basket or other stretcher or load. Sufficient extra length is preferably provided at the front end to keep the Stokes basket or other load back from the towing vehicle, to minimize the danger and nuisance of mud or stones or other material thrown up by the towing vehicle. 
   At least two parallel horizontal tube crossmembers ( 2 ) are mounted perpendicular to the main frame member ( 1 ), having turned-up ends ( 3 ) to support and restrain the trailer load. Preferably, the horizontal tube crossmembers ( 2 ) are sufficiently wide and spaced sufficiently far apart to contain a Stokes basket or other stretcher—approximately 28″ between uprights would accommodate most such devices. The crossmembers ( 2 ) should be spaced apart along the length of the frame ( 1 ) a sufficient distance to support the intended load—for Stokes baskets, a spacing of approximately 4 feet would be adequate. The crossmembers ( 2 ) and upright ( 3 ) arrangement allows mounting of additional load supports as desired—for example a tub or trough for holding loose material, or a platform with a tank and pump for back-country fire fighting, can easily be mounted to and removed from the trailer. Small rings ( 20 ), preferably at least a few on the uprights ( 3 ), allow places to anchor bungee cords or ratchet straps to anchor the trailer load. 
   Preferably, at least one vertical stop pole ( 5 ) is mounted to the main tube between the first horizontal tube ( 2 ) and the hitch assembly ( 4 ), to serve as a stop for the trailer load, and may serve as a place to mount IV pole for rescue use. 
   As seen in  FIG. 3 , the trailer ( 10 ) is supported by an undercarriage assembly having shock assemblies ( 6 ), an axle ( 17 ) and wheels ( 19 ). The axle ( 17 ) is crosswise under the frame ( 1 ), and the shock assemblies ( 6 ) are connected between the frame ( 1 ) and a mount adjacent the ends of the axle ( 17 ). The shock assemblies ( 6 ) are preferably of the kind having helper springs, as shown in the drawing, but may be of any other convenient kind. 
   A spring assembly ( 7 ), between the axle ( 17 ) and the main frame member ( 1 ), supports the trailer. It will be understood that while a coil spring ( 7 ) is shown, other types of resilient supports, such as leaf springs, air lift springs, or other types of springs known to the art, may be used. 
   A set of high flotation tires ( 9 ) are mounted on the wheels ( 19 ). Such tires ( 9 ) are not commonly used on trailers due to the aggressive tread. They have relatively soft rubber, and are not made for highway towing. The high flotation tires ( 9 ) along with the spring assembly ( 7 ) and shock assembly ( 6 ) improve ride and help prevent bogging in wet or heavy brush terrain. Diagonal undercarriage control arms ( 15 ) run from the axle ( 17 ) to the main member ( 1 ), and mount to the main member ( 1 ) with a pivot and pin ( 16 ). The control arms ( 15 ) steady the undercarriage assembly and prevent twisting of the axle ( 17 ). 
   As an optional feature, shown in  FIG. 7 , skis ( 21 ) may be mounted to the axle ( 17 ) in place of wheels ( 19 ) and tires ( 9 ), to allow the trailer to be used with snowmobiles on deeper snow than would be easy to traverse with the high-flotation tires. 
   The trailer is towable by the hitch assembly ( 4 ) coupled to the ATV by typical ball and hitch arrangement. However, other types of receivers and couplings, such as simple clevis and pin hitches, pintle hooks and rings, snowmobile couplings or other arrangements may be used. 
   As shown in the detail  FIG. 4 , the hitch assembly ( 4 ) for the trailer ( 10 ) preferably allows an interchange of hitch types, so as to be compatible with whatever emergency off-road vehicle might be available at any given time. The embodiment in  FIG. 4  shows a box tube receiver ( 12 ), of the general nature of the standard hitch receivers used to attach hitch balls to automobiles. A mounting tube ( 18 ) fits within the receiver ( 12 ), and is secured in place by a pin ( 13 ) running through the receiver ( 12 ) and mounting tube ( 13 ). The mounting tube ( 18 ) can be fitted with different types of hitches on each end—the embodiment shown in  FIG. 4  shows a ball-hitch receiver ( 14 ) on one end of the mounting tube ( 18 ), and a clevis-pin hitch ( 11 ) on the other. Alternatively, rings for pintle hooks, snowmobile couplings or other arrangements may be provided, as single hitch elements or in dual arrangements as shown in  FIG. 4 . 
   Another feature of the invention is best seen in  FIG. 3 , where we see a single tube ( 8 ) is mounted at the end of main frame ( 1 ) for accessories that may used with the trailer. Accessories may be attached through this tube and pinned in place by standard receiver pin. A hitch ball or clevis pin or the like may be mounted to this tube to allow two trailers to be pulled in tandem. 
   As shown in  FIG. 5 , rear seat ( 22 ) can be mounted through the rear accessory tube ( 8 ) via standard receiver style setup ( 23 ). This rear seat allows emergency personnel to attend to injured party during transport. It includes a seat ( 22 ) for sitting on, footrest ( 24 ) and seatbelt (not shown) for personnel safety. 
   As shown in  FIG. 6 , a hose roller ( 25 ) can also be mounted through the rear accessory tube ( 8 ) via standard receiver style setup ( 23 ). It is also mountable in any standard class III hitch on a pickup or the like for rolling hose not mounted to the trailer. Hose is placed between the two pins ( 26 ) that extend out from the faceplate ( 27 ) and is rolled up via the hand crank ( 28 ) on the rear. If used in conjunction with an aluminum tub (not shown) mounted to the trailer, personnel may haul rolled hose back to station for final cleanup. 
   Accordingly, it is to be understood that the embodiments of the invention herein described are merely illustrative of the application of the principles of the invention. Reference herein to details of the illustrated embodiments is not intended to limit the scope of the claims, which themselves recite those features regarded as essential to the invention.