Weighing scale

Claim 2

A weighing scale comprising, in combination, stationary frame means, movable load receiving means, transducer means for producing weight signals in accordance with movement of the load receiving means, check link means connecting the frame and load receiving means for movement of the load receiving means in a substantially vertical path, the check link means forming with the frame and load receiving means a plurality of parallelograms located in intersecting planes, and means for so adjusting the check link means to cancel errors caused by shifting loads upon the load receiving means parallel to each of said parallelograms that adjustments made to cancel errors caused by shifting loads parallel to any one parallelogram are independent of adjustments made to cancel errors caused by shifting loads parallel to any other parallelogram.

Claim 3

A weighing scale comprising, in combination, stationary frame means, movable load receiving means, transducer means for producing weight signals in accordanCe with movement of the load receiving means, check link means connecting the frame and load receiving means for movement of the load receiving means in a substantially rectilinear path, load in a first position upon the center of the load receiving means before adjustment causing a first weight signal to be produced, said load when shifted to a second position along a first line of direction away from the center of the load receiving means causing a second weight signal to be produced, and said load when shifted to a third position along a second line of direction perpendicular to said first line of direction away from the center of the load receiving means causing a third weight signal to be produced, the first signal not being equal to the second or third signal, and means for adjusting the check link means when said load is in said second and third positions to make the second and the third signals equal to the first signal, the adjustments made when the load is in said second and third positions being independent of each other.

Claim 4

A weighing scale comprising, in combination, stationary frame means, movable load receiving means, transducer means for producing weight signals in accordanCe with movement of the load receiving means, check link means connecting the frame and load receiving means for movement of the load receiving means in a substantially rectilinear path, load in a first position upon the center of the load receiving means before adjustment causing a first weight signal to be produced, said load when shifted to a second position along a first line of direction away from the center of the load receiving means causing a second weight signal to be produced, and said load when shifted to a third position along a second line of direction perpendicular to said first line of direction away from the center of the load receiving means causing a third weight signal to be produced, the first signal not being equal to the second or third signal, and means for adjusting the check link means when said load is in said second and third positions to make the second and the third signals equal to the first signal, the adjustments made when the load is in said second and third positions being independent of each other.

Claim 5

A weighing scale comprising, in combination, stationary frame means, movable load receiving means, transducer means for producing weight signals in accordance with movement of the load receiving means, check link means connecting the frame and load receiving means for movement of the load receiving means in a substantially rectilinear path, the weight signal being zero when no load is upon the load receiving means and the scale having a load shift error caused by load being repositioned on the load receiving means, and adjustment means for so canceling the load shift error that said weight signal remains zero when no load is upon the load receiving means.

Claim 6

A weighing scale comprising, in combination, stationary frame means, movable load receiving means, transducer means for producing weight signals in accordance with movement of the load receiving means, check link means connecting the frame and load receiving means for movement of the load receiving means in a substantially rectilinear path, the weight signal being zero when no load is upon the load receiving means and the scale having a load shift error caused by load being repositioned on the load receiving means, and adjustment means for so canceling the load shift error that said weight signal remains zero when no load is upon the load receiving means.

Claim 7

A weighing scale comprising, in combination, stationary frame means, movable load receiving means, transducer means for producing weight signals in accordance with movement of the load receiving means, check link means connecting the frame and load receiving means for movement of the load receiving means in a substantially vertical path, shifting loads before adjustment through the center of the load receiving means parallel to the check link means to a plurality of other locations upon the load receiving means causing a given load to produce different weight signals, and adjustment means for so making said load produce the same weight signals in all said locations that two independent load shift adjustments are provided, one for loads shifted in a first direction and one for loads shifted perpendicular to said first direction.

Claim 8

A weighing scale comprising, in combination, stationary frame means, movable load receiving means, transducer means for producing weight signals in accordance with movement of the load receiving means, check link means connecting the frame and load receiving means for movement of the load receiving means in a substantially vertical path, shifting loads before adjustment through the center of the load receiving means parallel to the check link means to a plurality of other locations upon the load receiving means causing a given load to produce different weight signals, and adjustment means for so making said load produce the same weight signals in all said locations that two independent load shift adjustments are provided, one for loads shifted in a first direction and one for loads shifted perpendicular to said first direction.

Claim 9

A weighing scale comprising, in combination, stationary frame means, movable load receiving means, transducer means for producing weight signals in accordance with movement of the load receiving means, check link means connecting the frame and load receiving means for movement of the load receiving means in a substantially vertical path, and means for adjusting the check link means to cancel errors caused by shifting loads upon the load receiving means, wherein the check link means forms with the frame and load receiving means a plurality of parallelograms located in intersecting planes and the means for adjusting includes means for rotating an adjustable check link means in each parallelogram about a point intermediate its ends to adjust parallelism of the sides of the parallelograms which are formed by check link means.

Claim 10

A weighing scale comprising, in combination, stationary frame means, movable load receiving means, transducer means for producing weight signals in accordance with movement of the load receiving means, check link means connecting the frame and load receiving means for movement of the load receiving means in a substantially vertical path, and means for adjusting the check link means to cancel errors caused by shifting loads upon the load receiving means, wherein the check link means forms with the frame and load receiving means a plurality of parallelograms located in intersecting planes and the means for adjusting includes means for rotating an adjustable check link means in each parallelogram about a point intermediate its ends to adjust parallelism of the sides of the parallelograms which are formed by check link means.

Claim 11

A weighing scale according to claim 5 wherein the means for adjusting includes for each adjustable check link means a pivot located midway between the ends of said check link means and screw means for tilting said check link means about said pivot.