Measuring and testing – Speed – velocity – or acceleration – With means for retaining reading
Patent
1975-12-11
1976-11-23
Swisher, S. Clement
Measuring and testing
Speed, velocity, or acceleration
With means for retaining reading
92 98D, 177209, G01L 708
Patent
active
039929469
ABSTRACT:
A weighing apparatus comprises a plurality of hydraulic load cells each including a piston, a cylinder, and a flexible diaphragm of fluid impervious material sealed in the cylinder and overlying the piston to form a fluid pressure receiving chamber. The cylinders are interconnected in spaced coaxial relation on a main support frame. The pistons are similarly mounted on a floating frame which comprises a number of threaded rods which permits reciprocal piston movement relative to the cylinder and to the main frame. A force sensitive output signal generator is mounted in the main frame in operative relation to the interconnected pistons to receive forces from them when fluid pressure is received in any of the pressure receiving chambers. The pistons are adjustably clamped to the threaded by nuts so that the piston-cylinder spacing may be changed for calibration purposes. Accordingly, the amount of force exerted by any one piston on the output signal generator may be varied independently of the force exerted by any other piston. The cylinder of each load cell is formed with an undercut portion to permit the inner cylindrical wall to flex in the radial direction in response to fluid pressure received in the pressure receiving chamber to permit flexing which compensates for non-linearity of output response due to difference in acting area of the diaphragm at different relative positions of the piston and cylinder.
REFERENCES:
patent: 3254573 (1966-06-01), Prell
patent: 3338323 (1967-08-01), Swersey
Swisher S. Clement
The A. H. Emery Company
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