Linearizing mechanism for a vibrating beam force transducer

• US 4,446,394 A
• Filed: 09/14/1981
• Issued: 05/01/1984
• Est. Priority Date: 09/14/1981
• Status: Expired due to Fees

• Current Assignee: Singer Company (SVP Holdings Ltd.)
• Original Assignee: Singer Company (SVP Holdings Ltd.)
• Inventors: Albert, William C.
• Primary Examiner(s): Wong, Peter S.
• Application Number:
  US06/301,622
• Time in Patent Office: 960 Days
• Field of Search: 310/321, 310/323, 310/330, 310/338, 310/348, 310/15, 310/25, 310/367, 310/368, 310/370, 73/777, 73/778, 73/781, 73/DIG. 1, 73/DIG. 4
• US Class Current: 310/321
• CPC Class Codes: G01P 15/097 by vibratory elements

Abstract

A single beam force transducer is provided with integrally affixed isolation springs which are axially compliant and unbalanced in their spring rates so as to induce beam bending due to applied tension and compression. The amount of bending introduced due to applied tension will be of a precise magnitude so as to substantially cancel undesirable non-linear vibration effects.

Claims

1. A force transducer comprising a vibrating beam having a longitudinal axis and adapted to vibrate in a plane including the axis;

a supporting element secured to each end of the beam and extending in both directions tranversely of the axis;

a pair of end mounts;

axially complaint isolator spring means each having multiple sections of unbalanced spring rates and extending between each end mount and a corresponding support element for transmitting axial forces from the end mounts to the beam along the longitudinal axis thereof; and

a pair of parallel spaced isolator means connected between each respective support element and sections of a corresponding spring means;

whereby the unbalanced spring rates of the spring means induce precise beam bending due to applied vibrational forces thereby substantially cancelling undesirable non-linear effects.

2. The structure set forth in claim 1 wherein each spring means comprises:

a first section parallel to the beam and extending from a first end portion of a respective end mount;

a second section perpendicular to the first and articulating from the first section to a corresponding isolator mass;

a third section parallel spaced to the first section and extending between a second end portion of a respective end mount, the third section having a thickness different from that of the first section; and

a fourth section located in spaced co-linear relation to the second section and having a thickness different from that of the second section, the fourth section being perpendicular to the third section and articulating from the third section to a corresponding isolator means.

3. The structure set forth in claim 2 wherein the first and second sections have the same thickness.

4. The structure set forth in claim 2 wherein the third and fourth sections have the same thickness.

5. The structure set forth in claim 3 wherein the third and fourth sections have the same thickness.