The invention is a dual-axis force transmission mechanism that operates as an actuator for the valve of fluid dispensing devices. It comprises a rotating trigger member (101) that pivots as a force is applied by the operator. The transmission mechanism preferably includes a rack and pinion arrangement in which a pinion gear (108) located on the rotatable trigger member (101) intermeshes with a rack gear (107) located on the opposing force transmission frame. This mechanism inter-converts a force applied to the rotatable trigger (101) into a rectilinear force that is then transmitted to operate the fluid dispensing valve.