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AssigneeHBM, Inc.
InventorsThomas W. Hansson, Randall K. Hopkins
Estimating the term…
A load to be measured is transmitted to a load cell, such as a compression load cell, through a double piston, single cylinder load transmitter that has a pressure chamber between two pistons in the single cylinder. One piston bears against the load. The other piston bears against the load cell to form a floating link between the load and the load cell when a sufficient pressure is introduced into said pressure chamber to prevent unwanted, off-center load application force components from adversely affecting any measured results. Preferably, at least one axially outwardly facing end surface of the piston bearing against the load cell has a curved end surface area. A rocker pin with a pressure controllable variable length may be formed by making both axially outwardly facing end surfaces curved. Several load transmitters may be arranged in parallel to transmit larger loads into a load cell.
A load measuring device comprising a load cell including a load application surface, at least one load transmitter positioned for introducing a load to said load application surface of said load cell, said at least one load transmitter comprising a hollow cylinder having a longitudinal central cylinder axis, a first piston in said hollow cylinder, a second piston in said hollow cylinder, a pressure chamber in said hollow cylinder between inner ends of said first and second pistons, a fluid inlet connected to said cylinder and leading into said pressure chamber for introducing a fluid under pressure into said pressure chamber to force said first and second pistons axially in opposite directions against said load application surface of said load cell and against a load respectively.
A method for introducing a load into a load cell, comprising the following steps:
A rocker pin for introducing a load into a load cell, comprising a hollow cylinder having a central longitudinal axis, a first piston in said hollow cylinder, a second piston in said hollow cylinder, a pressure chamber between said first and second pistons in said hollow cylinder, an inlet for introducing a fluid under pressure into said pressure chamber, said first piston having an axially outwardly facing first surface with a curved first surface area, said second piston having an axially outwardly facing second surface with a curved second surface area thereby forming said rocker pin.
Dependencies are inferred from the claim text.