Method for assembling an annular shear accelerometer

• US 4,941,243 A
• Filed: 07/28/1989
• Issued: 07/17/1990
• Est. Priority Date: 07/28/1989
• Status: Expired due to Fees

• Current Assignee: Endevco Corporation (Illinois Tool Works Inc.)
• Original Assignee: Alliedsignal Inc. (Honeywell International Inc.)
• Inventors: Cleveland, Lester G.
• Primary Examiner(s): Hall, Carl E.
• Application Number:
  US07/387,330
• Time in Patent Office: 354 Days
• Field of Search: 29/25.35, 310/357, 310/369, 310/333, 310/329
• US Class Current: 29/25.35
• CPC Class Codes: G01P 15/0915 of the shear mode type
• CPC Class Codes: Y10T 29/42 Piezoelectric device making

Abstract

In a method for use in assembling an annular shear accelerometer (10), a nested combination of an expandable force ring (14), a crystal (16), and a mass element (18) is formed, and the force ring (14) is wedge to exert radially tensile force thereon. The force ring (14) and mass element (18) thereby cooperate to exert radially compressive force on the crystal (16), thus effecting friction locks between the radially adjacent pairs of elements which make up the nested combination (14, 16, 18).

Claims

1. In the assembly of an annular shear accelerometer, a method comprising the steps of:

nesting at least an axially extending portion of an annular crystal in an annular mass element so that a radially outer surface of the crystal abuts a radially inner surface of the mass element;

nesting at least an axially extending portion of a radially expandable force ring in the crystal so that a radially outer surface of the ring abuts a radially inner surface of the crystal;

nesting at least an axially extending portion of a generally conical mounting post in the force ring so that a radially outer, generally conical surface of the post abuts a radially inner surface of the force ring; and

exerting force that tends to produce relative motion between the radially inner surface of the force ring and the radially outer surface of the post in a direction such that the ring is urged toward a lower base of the post, in response whereby the ring is urged to expand in radially outward directions, thereby radially compressing the crystal between the ring and the mass element.

2. A method as in claim 1 comprising the further step of captively securing the force ring, crystal and mass element to the post.

3. A method as in claim 2 wherein the exerting step is effected as a response to performance of the securing step.

4. A method as in claim 1 wherein the steps are performed in the order therein recited.

5. In the assembly of an annular shear accelerometer, a method comprising the steps of:

nesting at least an axially extending portion of an annular crystal in an annular mass element so that a radially outer surface of the crystal abuts a radially inner surface of the mass element;

nesting at least an axially extending portion of a radially expandable force ring in the crystal so that a radially outer surface of the ring abuts a radially inner surface of the crystal;

nesting at least an axially extending portion of a wedge member having a radially divergent outer surface in the force ring so that the divergent outer surface abuts a radially inner surface of the force ring; and

exerting force that tends to produce relative motion between the radially inner surface of the force ring and the divergent surface such that the ring is urged along the divergent surface in a direction of divergence, in response whereby the ring is urged to expand in radially outward directions, thereby radially compressing the crystal between the force ring and the mass element.