Patent Application
20050236796
1. Field of the Invention
This invention relates in general to vehicle suspension systems, and more particularly to suspension systems utilized on trailers and other similar vehicles.
2. Prior Art
There are many instances where it is desirable to lower a trailer or similar vehicle in contact with the ground, or to raise it to avoid contact with objects on the ground. Such lowering in many instances increases the ease in loading the trailer or for the addition or removal of a portion of the trailer. In other instances the lowering of the trailer increases its stability if there is a platform attached to the trailer that is to be raised. In being able to raise the trailer one can avoid damage to the trailer resulting from contact with objects on the ground.
There are lowering systems that place a substantial portion of the trailer in contact with the ground. Examples of such systems are illustrated in U.S. Pat. Nos. 5,308,213 and 6,113,130, as well as Swiss Patent 449436. It is also known to have separate suspension assemblies for each wheel that are united for disengagement from the vehicle chassis to permit the chassis to be lowered to the ground. Examples of such assemblies are illustrated in U.S. Pat. Nos. 3,788,675, 4,659,100, 5,474,416, 5,906,470 and 6,520,521. However, there remains a need for less complex and more inexpensive suspension systems that can be used to lower a trailer to the ground. There is also a need for a suspension system that permits both the lowering and the raising of the vehicle.
Therefore, one object of this invention is to provide an improved suspension system for lowering or raising a trailer or similar vehicle in relation to the ground
Another object of this invention is to provide an improved suspension assembly that is less expensive to construct and easy to operate
Still another object of this invention is to provide an improved suspension assembly that can operate independent of other suspension assemblies that may be utilized with the trailer or similar vehicle.
Other objects and advantages of this invention shall become apparent from the ensuing descriptions of the invention.
Accordingly, a suspension assembly is taught that comprises an elongated attachment member having first and second end sections, a leverage arm having first and second leverage arm end sections affixed to the attachment member having its second leverage arm end section extending in the direction of and at an angle to and in substantially the same plane as the first end section of the attachment member. The suspension assembly further comprising a wheel axle support bar. The bar is connected to and pivots about the second leverage arm end section. It further comprises a suspension member extending substantially perpendicularly from the support bar in a direction toward the chassis. The suspension member has a length sufficient to permit the suspension member to be affixed to the vehicle chassis and provide the desired suspension characteristics. In a preferred embodiment the suspension member will be constructed at least in part from an elastomeric composition. In another preferred embodiment the elongated attachment member and the leverage arm will be fixed to a wheel well. In still another preferred embodiment a wheel axle will extend substantially perpendicularly from the support bar and into the interior of the wheel well.
The accompanying drawings illustrate a preferred embodiment of this invention. However, it is to be understood that this embodiment is not intended to be exhaustive, nor limiting of the invention. They are but examples of some of the forms in which the invention may be practiced.
Without any intent to limit the scope of this invention, reference is made to the figures in describing the preferred embodiments of the invention.
For purposes of describing the invention vehicle means any moving device having a chassis supported on wheels. Examples of such vehicles include trailers, wagons and carts, whether self-propelled or propelled by another motorized vehicle, such as a car or truck.
Referring to
In one aspect of this invention the suspension assembly 11 is utilized to affix the wheel assembly 7 to the chassis 1. In a preferred embodiment each of the suspension assemblies 11 comprise an attachment member 12 having first and second end sections 13 and 14 respectively. The first end section 13 is attached to suspension member 15 in a manner to permit attachment member 12 to pivot about suspension member 15. The second end section 14 is provided with an opening 16 that is aligned to a corresponding opening 17 in the adjacent rail 2 or 3 to permit the second end section 14 to be affixed to the rail. A leverage arm 18 having first and second leverage arm end sections 19 and 20, respectively, to permit first leverage arm end section 19 to be fixed in position at an angle “A” relative to leverage arm 18 and in the same vertical plane as attachment member 12. The second leverage arm end section 20 extends a sufficient distance to permit the attachment of cables (not shown) or to be gripped to lift or lower attachment member 12. Suspension member 15 extends substantially perpendicularly to attachment member 12 in the direction of and is affixed to the adjacent rail 2 or 3. In a preferred embodiment suspension member 15 is constructed at least in part of elastomeric material. In a more preferred embodiment the material has a flexibility of approximate 60 to 90 durometers, most preferably an approximate 80 durometers. The selection of the material to be used and the length of suspension member 14 can vary depending on the suspension characteristics desired and the size and weight of the vehicle chassis and anticipated load the chassis is to carry.
Turning now to the
During normal use suspension assemblies 7 or 8 are fixed on their respective rails 2 and 3. This is achieved by bolting or otherwise securing second end section 14 to the adjacent rail. When it is desired to lower chassis 1 to the ground, nut 32 is unscrewed from bolt 33. If a cable is to be used to pull up on leverage arm 18, then the cable is attached to the second leverage arm end section 20 by attaching a conventional connecting member to an eyebolt or opening 35 in the second leverage arm end section 20. The cable is made taunt to take the load off of bolt 33 to permit its easy removal from opening 16. If it is desired to lower chassis 1 the cable is fed out to permit chassis 1 to be lowered. On the other hand if it is desired to raise chassis 1, the cable is cranked up to raise leverage arm 18 which then results in chassis 1 being raised.
Any type of conventional cable pulling system can be used. One example would include a pulley having a manual or motor driven cable reel mounted atop of a vertical post 34 extending vertically up from the chassis 1 or the tongue 36 that affixes the chassis to a car or truck.
There are of course other alternate embodiments which are obvious from the foregoing descriptions of the invention which are intended to be included within the scope of the invention as defined by the following claims.
