FIELD OF THE INVENTION
This invention relates generally to a ramp used with a trailer for hauling heavy equipment, and more specifically to a system for making that ramp easier to operate.
BACKGROUND OF THE INVENTION
Trailer ramps can be difficult to operate. It is necessary to open the ramp when equipment is mounted on the trailer, and when the equipment is properly in place it is then necessary to close the ramp. Some ramps come with springs that assist a user in closing the ramp. However, opening the ramps can still be difficult. Consequently, a means of reducing the force necessary for both closing and opening a trailer ramp is desired.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a mechanism which makes a trailer ramp easier to both open as well as close. It is an additional object of the present invention to do so in way that does not interfere with normal operation and use of the ramp. These and other objects and advantages of the invention will become readily apparent as the following description is read in conjunction with the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 shows a first embodiment of the present invention located within a trailer ramp;
FIGS. 2A, 2B, 2C show three positions of the present invention;
FIGS. 3 & 4 shows more detail of the embodiment shown in FIGS. 1 and 2;
FIG. 5 shows the relationship between axles of the embodiment shown in FIGS. 1-4;
FIG. 6 shows detail of the embodiment shown in FIGS. 1-5; and
FIG. 7 shows a latch used within the present invention.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
Before explaining the disclosed embodiment of the present invention in detail it is to be understood that the invention is not limited in its application to the details of the particular arrangement shown, since the invention is capable of other embodiments. Also, the terminology used herein is for the purpose of description and not of limitation.
Farm equipment is heavy, so that the trailers for hauling that farm equipment must be extremely durable. This includes the ramps which are used to drive or roll the equipment onto that trailer. However, because of the large forces applied to these ramps, these ramps can be very heavy. Although this heaviness is good for durability, it can make the ramps difficult to lift, move, open, and close.
To address these and other problems, a system 100 for use within a trailer ramp of a truck 104 is disclosed in FIG. 1. The system 100 enables the ramp 101 to be more easily operated. At times, such as but not limited to during opening, the ramp 101 can be very heavy to lift, so that significant force must be applied to the handle 105.
FIGS. 2A, 2B, 2C show the three main positions of operation of the ramp 101. FIG. 2A shows the ramp 101 in a closed position, and FIG. 2C shows the ramp 101 in its open position. FIG. 2B shows the ramp 101 in an intermediate position, although various details are omitted for clarity. The position shown in FIG. 2B is a type of “tipping point” of the ramp 101, where various forces within the system 100 are carefully managed.
FIGS. 3 & 4 show more detail about the system 100. As stated earlier, the ramp 101 is permanently but rotatably affixed to a truck 104. The system 100 has two axles, a near axle 108 and a far axle 124. Near and far are from the perspective of the truck 104. As shown in FIG. 3, a near spring 112 ise wrapped about the near axle 108 controls tension between the ramp 104 and the far axle 124, as illustrated by one outstretched end of the spring 112 touching the truck 104, while the other outstretched end touches the axle 124. Although only a single spring 112 is shown in FIG. 3 and other figures, this is but for exemplary purposes only, so that the present invention should not be considered as limited exclusively thereto. A plurality of near springs 112 could also be incorporated into the system 100 of the present invention.
Meanwhile, as shown in FIG. 4, a pair of far springs 120L and 120R are wrapped about the left and right portions of the far axle 124, and control tension between the ramp 101 and the truck 104.
A pair of cams 116L and 116R make adjustments to the rotation of the ramp 101 about the near and far axles 108, 124. When the ramp 101 is moving between its closed position (FIG. 2A) and the tipping point (FIG. 2B), it rotates about the near axle 108. At this time, the spring 112 is in effect, but the springs 120L and 120R are not active. While in the tipping point position (FIG. 2B), the ramp 101 rests upon both near and far axles 108, 124. When the ramp 101 moves between the tipping point (FIG. 2B) and its open position (FIG. 2C), it rotates about the far axle 124. At this time, the spring 112 is not in effect, but the springs 120L and 120R are active.
FIG. 5 shows an exemplary distance between the near (first) and far (second) axles 108, 124 respectively, which is labeled as d1-2. FIG. 5 also shows an exemplary distance between the truck 104 and the near (first) axle 108, which is labeled as dt-1. If the near (first) axle 108 is too far from the far (second) axle 124, that is, if d1-2is too large, the ramp 101 will tend to urge upward, and will not properly settle it place while closed. The ramp 101 will also be too hard to push down while closing. Meanwhile, if the near (first) axle 108 is too close to the far (second) axle 124, that is, if d1-2 is too small, the ramp 101 could jam, and potentially not close at all.
Similarly, if the near (first) axle 108 is too close to the body of the truck 104, that is, if dt-1 is too small, the tension force provided by spring 112 will be reduced, to that it could be almost as difficult to open the ramp 101. Meanwhile, if the near (first) axle 108 is too far from the body of the truck 104, it will interfere with the safe movement and operation of the ramp 100, and also interfere with or unbalance the effect of the springs 120L , 120R.
The spring 112 can be made from steel, although other materials are also contemplated within the spirit and scope of the present invention. The spring 112 is carefully calibrated to have a specific angle. If the angle is too small, the tension force and resulting lifting relief accorded by the spring 112 would be insufficient and thus would not help a person operate the ramp 101, so that it would still be necessary to apply hernia-level force to the handle 105. Meanwhile, if the angle of the spring 112 was too large, it would tend to always force the ramp 101 into a closed position, even when such an effect is not wanted by the user.
FIG. 6 shows more detail of the tipping point position of the ramp 101 first shown in FIG. 2B. FIG. 6 shows the function of the cams 116, although only the rightmost cam 116R is shown. From FIG. 6 it is apparent that the cams 116 are connected to both the near and far axles 108, 124.
Using the opening of the ramp 101 from its closed position in FIG. 2A as an example, it becomes apparent that the system 100 first rotates the ramp 101 about the near axle 108. During this time, the spring 112 affects the operation of the ramp 101, while the springs 120L and 120R are not active. The cams 116L,R assist in determining when that first rotation is complete. At the predetermined tipping point (FIGS. 2B, 6), the cams 116 transfer the rotary effect of the ramp 101 to the far axle 124. From there, rotation of the ramp 101 then continues until it reaches the position shown in FIG. 2C. During that time, the spring 112 does not affect the operation of the ramp 101, while the springs 120L and 120R are active.
The system 100 of the present invention assists in the smooth and easy operation of this rotation. Because all equipment involved in the process of using the ramp 101 is heavy, such as that used in agricultural equipment, the ramp 101 must bear a significant amount of weight. The loadbearing members of the ramp 101 thus weigh a significant amount, and once put into position must remain in that position. The downside of this is that the ramp 101 sometimes resists being moved from one position to another during opening and closing.
As demonstrated herein, the system 100 of the present invention provides a safety feature for users of the ramp 101. Otherwise, the ramp 101 could require an excessive amount of force to operate.
While the ramp 101 is in its closed position (FIG. 2A), its weight is compensated by the various springs within the system 100 of the present invention. Because of this, in its closed state, the ramp 101 has only minimal tension applied thereto. Accordingly, while driving, the ramp 100 can fly up, bounce, or go anywhere.
To address this problem, a latch 700 is shown in FIG. 7. However, although a latch is shown in FIG. 7, other securing mechanisms are also contemplated within the spirit and scope of the present invention.
It is anticipated that various changes may be made in the arrangement and operation of the system of the present invention without departing from the spirit and scope of the invention, as defined by the following claims.
Patent Application
20080178400
