On Board Scale Devices

1. Field of the Invention

This invention relates to on board scale devices for weighing freight, that are of the type that are normally stored out of the way, and which can be raised into position to contact and weigh the freight.

2. Description of the Prior Art

An important consideration to shippers of freight, is the ability to be able to quickly and easily obtain the weights of various items being shipped, which information is particularly desirable for goods being shipped by air, due to loading restrictions and other considerations.

Much freight is palletized and characteristically picked up at a variety of customer locations, and then taken to an airport cargo area, or truck terminal where the pallets are assembled with other goods to form a load. Time and space considerations render impracticable providing each terminal area with scales, which would require the freight to be unloaded, weighed and then loaded again, which is one approach that has been used.

It is far more convenient to be able to weigh the freight on the pickup vehicle, and then provide the actual weight to the terminal personnel who are assembling the load.

The apparatus of my invention can weigh the freight on the pickup vehicle, and provide concurrent advantages not found in prior methods of freight weighing.

This invention relates to on board scale devices used in conjunction with a trailer, truck or other structure to obtain the weights of various freight items placed thereon, and includes one or more retractible pneumatic scale assemblies for weighing the freight.

The principal object of the invention is to provide on board scale devices that are capable of being stored out of the way until use.

A further object of the invention is to provide on board scale devices which permit of vehicular traffic thereon, in out of use position, without injury thereto.

A further object of the invention is to provide on board scale devices wherein the shock load on the device is minimized.

A further object of the invention is to provide on board scale devices which are simple and inexpensive to construct but sturdy and reliable in operation.

A further object of the invention is to provide on board scale devices which are suitable for weighing a wide variety of freight items.

Other objects and advantageous features of the invention will be apparent from the description and claims.

The nature and characteristic features of the invention will be more readily understood from the following description taken in connection with the accompanying drawings forming part hereof in which:

FIG. 1 is a top plan view, illustrating one embodiment of on board scale device of the invention, four being shown, in place in a vehicle;

FIG. 2 is a vertical sectional view, enlarged, of the scale device of FIG. 1, taken approximately on the line 2--2 of FIG. 1;

FIG. 3 is a vertical sectional view, enlarged, of the scale device of FIG. 1, taken approximately on the line 3--3 of FIG. 1, and showing the device in stored out of use position;

FIG. 4 is a view similar to FIG. 3 showing the scale device in condition to contact an item for weighing;

FIG. 5 is a top plan view similar to FIG. 1 but showing eight scale devices in place in a vehicle; and

FIG. 6 is a vertical sectional view similar to FIG. 4 but showing another embodiment of the on board scale device of the invention.

It should, of course, be understood that the description and drawings herein are illustrative merely and that various modifications and changes can be made in the structure disclosed without departing from the spirit of the invention.

Referring now more particularly to the drawings and FIGS. 1-4 thereof, a vehicle floor 10 of a vehicle (not shown) is illustrated in FIG. 1 which is generally a freight pickup vehicle and can be a truck, trailer or other structure, into which items are placed to be weighed and transported. The vehicle floor 10 as illustrated is of rectangular configuration and is shown as carrying four scale devices 15 of the invention in recesses 16 in floor 10. The devices 15 are of generally rectangular configuration and includes a lower upturned U-shaped channel 18, which rests on the bottom surface 19 of recess 16. A pneumatic lifting assembly 20 is provided which, in FIGS. 2-4, is shown as an airbag of well known type carried inside of and resting on the channel 18, with a second channel 21 engaged therewith, also of U-shape extending upwardly, and separated from the side walls 23 of channel 18 by guide and wear plates 24.

The airbag 20 is connected to a source of air under pressure (not shown) to selectively provide air for expansion of the airbag to be described.

The channel 21 has a downturned cover plate 22 thereon also of U-shape, which extends over the outside of channel 18 between it and vertical walls 27 of recess 16.

A load beam 25 is provided which extends along channel 21 with at least one load cell 26 engaged therewith, and which cell 26 is carried by a retainer plate 28 which is engaged with channel 21. The load cell 26 is of well known type, and preferably electronic, with leads (not shown) connected to a digital read out panel 35 to provide the vehicle operator with the weight of the item or items carried thereon.

Referring now more particularly to FIG. 5, another vehicle floor 100 is therein illustrated and which includes a plurality of devices 115, some eight in number being shown, which are carried in recesses 116 in floor 100. In all other respects, the devices 115 are as illustrated for FIGS. 2, 3, and 4, but for certain applications it may be desirable to utilize more than four devices and, in actuality, as many as are desired and can be accommodated may be used.

Referring now more particularly to FIG. 6, another embodiment of scale device 215 is therein illustrated, which is carried in a recess 216 of a vehicle floor 200. The device 215 is of generally rectangular configuration with a lower upturned U-shaped channel 218 which rests on the bottom surface 219 of recess 216. The channel 218 carries a load beam 225 thereon which extends therealong and has a load cell 226 carried therein by a retainer plate 227. The load cell 226 is of well known type and can be identical to load cell 26 previously described. The channel 218 on the outside thereof is provided with guide and wear plates 224, over which a cover plate 222 of U-shape extends downwardly into recess 216.

A pneumatic lifting assembly 220 is provided which can be an airbag as described for assembly 20 and is carried on top of load beam 225 between it and the cover plate 222.

The airbag 220 is connected to a source of air under pressure (not shown) for selective expansion as desired to lift the plate 222 into contact with the freight items (not shown) to be weighed.

The mode of operation will now be pointed out.

Referring to FIGS. 1-4, the airbag 20 is normally in deflated condition as shown in FIGS. 2 and 3 so that the scale device 15 is entirely below the floor 10. When a freight item such as a pallet (not shown) containing various freight items is picked up, and its weight required, it is placed on one or more scale devices 15. The airbag or bags 20 are inflated as shown in FIG. 4, to the desired predetermined pressure, and the channels 21 are elevated so that the tops 36 of the load cells 26 are engaged with the undersides 37 of cover plates 22, thereby transmitting the weight of the palletized freight to the load cell or cells 26. The weight of the freight item or items is displayed on panel 35 and may be recorded. The airbags 20, when in inflated condition, act as a cushion or shock absorber thereby providing protection to the scale devices 15 from impact loads. The airbags 20 are deflated, and the scale devices 15 are thereby retracted to a position below the floor 10 level, where they are protected until use is again required.

Referring to FIG. 6, the airbag 220 is shown in inflated condition for engagement of the freight items to be weighed. The airbag 220 would start in deflated condition like airbag 20 and, when inflated, lifts cover plate 222 to engage the freight item or items (not shown), and the weight would be transmitted to the load beam 225, and thereby to the load cell 226 where the weight is ascertained and transmitted to a read out panel (not shown) where it may be read by the operator. The airbag 220 can be deflated and cover plate 222 return to floor level as desired.

It will thus be seen that apparatus has been provided with which the objects of the invention are attained.