This invention relates to vehicle levelers and more particularly to a vehicle leveler having multiple surface angles as well as safety features, including an integrated lighting system.
A variety of truck levelers have been devised to adjust the height of different trailers to properly match the deck of the trailer to the height of the dock. By aligning the height of the trailer and the dock the loading and unloading of cargo is facilitated.
One such device is seen in U.S. Pat. No. 4,624,446 to Gould which discloses a reinforced platform pivotally mounted to the ground at one end and includes a support assembly having hydraulic cylinders. In operation the rear wheels of a truck trailer are backed onto the platform and then the non-mounted end of the platform is lifted by the hydraulic cylinders until the deck of the trailer is equal to the height of the dock.
A similar device is shown in U.S. Pat. No. 4,765,792 to Cherry, et al. which also discloses a pivotally-mounted and hydraulically-raised platform. In addition to the disclosure of Gould, the device includes mounting the hydraulics inwardly from the non-mounted end of the platform and an aperture in the non-mounted end of the platform to accommodate a truck restraining device.
Another design is disclosed in U.S. Pat. No. 6,368,043 to Leum, et al. which teaches a low-profile truck leveler. In this design a low-profile leveler is enabled through the use of a raised rear beam and two lateral beams that extend above the upper surface of the platform. In addition, a central beam adds further to the strength and rigidity of the leveler.
Vehicle levelers of the prior art typically have certain disadvantages. The majority of vehicle levelers have ramp surfaces which are not highly adjustable. This is a distinct disadvantage when vehicles are being loaded or unloaded with cargo. Levelers of the prior art are also not able to accommodate all types of vehicles. This is yet another disadvantage.
Some levelers of the prior art have certain shortcomings and disadvantages to which this device is drawn. Specifically, it would be advantageous to have a vehicle leveler which is highly adjustable and can elevate both the rear and front axles of a vehicle at the same time so as to minimize the slope of the internal floor of the vehicle and thereby allow safer loading and unloading of cargo. It would also be advantageous to have a vehicle leveler which has enhanced safety features such as an adjacent elevated walkway for vehicle operators as well as integrated lights on the vehicle leveler.
In summary, there are problems and shortcomings in the prior art vehicle levelers and it is to these needs that this device is drawn.
It is an object of this invention to provide a vehicle leveler which is highly adjustable and can elevate both the rear and front axles of a vehicle at the same time so as to minimize the slope of the internal floor of the vehicle or trailer.
Another object of this invention is to provide a vehicle leveler which has improved safety during loading and unloading of cargo from a vehicle which is on the leveler.
Yet another object of this invention is to provide a safe walkway surface so as to give the vehicle driver a wide walk surface to assist them as they step into and out of a vehicle as well as when they walk around adjacent trailers.
Another object of this invention is to provide a safety light system which is integrated into the vehicle leveler and controlled by a sensor near the door.
These and other objects of the invention will be apparent from the following descriptions and from the drawings.
The preferred embodiment of the invention includes a vehicle leveler for use with a driveway which includes a first portion having a leading edge and a trailing edge. The trailing edge is disposed further from the driveway than the leading edge and forms a ramp section. The first portion has a flat section adjacent the trailing edge and the flat section is disposed about parallel with the substantially flat driveway. The second portion also includes an extension portion which extends from the trailing edge of the second portion toward the rear of the leveler and includes a substantially flat section disposed about parallel with the substantially flat driveway. The first portion and second portion are each unitary structures which are separate from each other until they are removably attached together by a connection apparatus. It is highly preferable that the vehicle leveler includes opposing side portions which extend the length of and contact the second portion and extension portion, the opposing side portions having a top surface which forms a walkway.
In highly preferred applications, two or more vehicle levelers can be installed adjacent to each other and an extended walkway surface can be removably installed between each vehicle leveler to form a large surface for a vehicle driver to use. It is preferable that the extended walkway surface and top surface form a large walkway for a vehicle driver. In some preferred embodiments each vehicle leveler has two, opposing top surfaces which each form a separate walkway. The walkway can extend the complete length of the top surface in some preferred embodiments or it can only extend a portion of the length of the top surface.
Preferably, the walkway and extended walkway surface include metal grating for a safe contact surface for a vehicle driver walking on the walkway or extended walkway surface.
The first portion and second portion are each preferably unitary structures which are separate from each other until they are removably attached together by a connection apparatus. It is highly preferred that the second portion including the extension portion can be moved between a lowered position and a raised position to accommodate varying dock heights for loading and unloading of cargo from vehicles. It is also preferable that the ramp section can be of varying lengths and heights to accommodate a single, rear axle vehicle as well as a large trailer.
Highly-preferred embodiments include at least one light on the opposing side portions. The at least one light is controlled by a sensor adjacent to a door and the sensor is preferably a proximity sensor.
Highly preferred embodiments also include that the door is a loading dock door and when the door is in an open position the at least one light is a first color and when the door is in a closed position the at least one light is a second, different color. Preferably, the sensor automatically changes the color of the at least one light between two different colors (which could be red or green or any other color) depending on if the door is in the open position or the closed position.
Preferably, the at least one light consists of multiple lights which are installed along a length of each opposing side portion. Each opposing side portion has an inside wall surface and an outside wall surface and preferably the multiple lights are installed along the inside wall surface. In other preferred embodiments, the at least one light is installed along the outside wall surface. It is preferable that multiple lights are installed along the outside wall surface. The at least one light along the outside wall surface is preferably a white light but can be any color light which illuminates the walkway for a user.
Highly-preferred embodiments include at least one light on the opposing side portions, the light(s) is controlled by at least one sensor which can sense when the vehicle leveler is in a lowered position and which changes the color of the light(s) when both the vehicle leveler is in a lowered position and the adjacent dock door is closed. Preferably, a proximity sensor senses both when the vehicle leveler is in the lowered position and the dock door is closed. Highly preferred embodiments include the at least one light being located on the inside surface of the opposing side portions and/or the at least one light being located on the outside surface of the opposing side portions.
The drawings illustrate preferred embodiments including the above-noted characteristics and features of the device. The device will be readily understood from the descriptions and drawings. In the drawings:
and
A preferred embodiment of the present invention is shown in
First portion 12 has a ramp section 20 which is inclined upwards and a flat section 22 adjacent ramp section 20. First portion 12 includes a leading edge 14 and a trailing edge 16. Trailing edge 16 is disposed further from driveway 18 than leading edge 14. Trailing edge 16 is part of flat section 22. Flat section 22 is disposed about parallel with substantially flat driveway 18.
Second portion 24 also includes an extension portion 30 as can be seen in
The drawings illustrate that second portion 24 including extension portion 30 can be moved between a lowered position 36 as seen in
Depending on the length of the vehicle, leveler 10 can be customized in a variety of ways including that extension portion 30 can consist of multiple extension portions which are identical and which are removably attached together so as to accommodate a vehicle which has a longer length.
Leveler 10 can be manufactured so that ramp section 20 can be of varying lengths and heights to accommodate a single, rear axle vehicle as well as a large trailer.
A lifting system is also incorporated into leveler 10 in the form of hydraulic lifts 48 which contact driveway 18 as seen in
Leveler 10 may also include wheel guides 54 shown in
The relationship between first portion 12 and driveway 18 as well as second portion 24 and driveway 18 can also be defined in terms of angles as shown in
In operation, a vehicle (including sometimes a large trailer) is backed up to leveler 10 to put the rear wheels onto first portion 12, specifically ramp section 20. The wheels and trailer are therefore elevated from driveway 18 as they are backed up onto ramp section 20. As the vehicle is further backed onto leveler 10 the rear wheels pass onto second portion 24 or decline section 56 and begin to be lowered back toward driveway 18. As the rear wheels continue to be backed up, they contact extension portion 30 and at this point, depending on the length and size of the trailer or vehicle, the rear of the trailer or vehicle may now be in contact with loading dock wall 46. Depending on the length of the vehicle or trailer, the front wheels may either be in contact with first portion 12 as can be seen in
As seen best in
When door 88 is in an open position 90 as seen in
In certain embodiments, at least one light 84 are multiple lights installed along a length of each opposing side portion 58. Each opposing side portion 58 has an inside wall surface 94 and an outside wall surface 96 as can be best seen in
Multiple sets of photoelectric sensors 86 can be used and placed at varying locations adjacent vehicle leveler 10. Photoelectric sensors 86 are mounted onto a building wall 76 as seen in
Photoelectric sensors 86 can operate independently of the power supply for the vehicle leveler, which allows photoelectric sensors 86 the ability to stop the lowering or raising of vehicle leveler 10 by stopping a supply of power to a motor.
A powered wheel chock 102 which has sensors to identify when wheel chock 102 is in place against the wheel of a vehicle is also included and shown in
The power supply has a current draw which is lower than a current draw from a power supply unit with an AC motor. The battery powers a 12 volt direct current power system which requires a large amount of power for a short period of time. The battery can be charged over a period of time with a lower power requirement from the building, thereby allowing use of a 120 volt 15 amp circuit to power a dock door.
A wide variety of materials are available for the various parts discussed and illustrated herein. Although the device has been described in conjunction with specific embodiments thereof, it is evident that many alternatives, modifications and variations will be apparent to those skilled in the art. Accordingly, it is intended to embrace all such alternatives, modifications and variations that fall within the spirit and broad scope of the appended claims.
This application is a continuation-in-part of patent application Ser. No. 17/550,870, filed on Dec. 14, 2021, which is a continuation-in-part of patent application Ser. No. 17/468,882, filed on Sep. 8, 2021, which is a continuation-in-part of patent application Ser. No. 17/355,160, filed on Jun. 22, 2021, which is a continuation-in-part of patent application Ser. No. 17/340,670, filed on Jun. 7, 2021, which is a continuation-in-part of patent application Ser. No. 17/322,889, filed on May 17, 2021, which is a continuation-in-part of patent application Ser. No. 17/174,301, filed on Feb. 11, 2021, which is a continuation-in-part of patent application Ser. No. 17/026,642, filed on Sep. 21, 2020, which is a continuation-in-part of patent application Ser. No. 16/376,910 filed on Apr. 5, 2019, issued on Oct. 27, 2020 as U.S. Pat. No. 10,815,103. Such prior applications are incorporated by reference herein in their entirety.
Number | Date | Country | |
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Parent | 17550870 | Dec 2021 | US |
Child | 17590056 | US | |
Parent | 17468882 | Sep 2021 | US |
Child | 17550870 | US | |
Parent | 17355160 | Jun 2021 | US |
Child | 17468882 | US | |
Parent | 17340670 | Jun 2021 | US |
Child | 17355160 | US | |
Parent | 17322889 | May 2021 | US |
Child | 17340670 | US | |
Parent | 17174301 | Feb 2021 | US |
Child | 17322889 | US | |
Parent | 17026642 | Sep 2020 | US |
Child | 17174301 | US | |
Parent | 16376910 | Apr 2019 | US |
Child | 17026642 | US |