Vibration isolator and shock absorber device

• US 4,630,809 A
• Filed: 05/13/1985
• Issued: 12/23/1986
• Est. Priority Date: 05/13/1985
• Status: Expired due to Fees

• Current Assignee: Baker Hughes Incorporated (Baker Hughes Company)
• Original Assignee: Teleco Oilfield Services, Inc. (Baker Hughes Company)
• Inventors: Duckworth, Allen
• Primary Examiner(s): Reger, Duane A.
• Application Number:
  US06/732,928
• Time in Patent Office: 589 Days
• Field of Search: 188/268, 267/63 A, 267/125, 267/141, 267/141.1, 267/141.2, 267/141.3, 267/141.7, 267/153
• US Class Current: 267/141.1
• CPC Class Codes: E21B 17/07 Telescoping joints for varying drill string lengths; Shock absorbers
• CPC Class Codes: E21B 47/017 Protecting measuring instruments
• CPC Class Codes: E21B 47/18 through the well fluid , e.g. mud pressure pulse telemetry
• CPC Class Codes: F16F 1/3814 characterised by adaptations to counter axial forces F16F1/393 takes precedence

Abstract

A vibration isolator and shock absorber device is presented wherein elastomeric vibration isolation elements interact with reaction elements to form differential springs, i.e., springs in which the deflection and load characteristics change with load. In the present invention, the load characteristics change from shear at low loading to compression at high loading, with a smooth transition between shear and compression.

Claims

1. A vibration isolator and shock absorber device having a longitudinal axis and including:

a plurality of ring elements in an array, each of said ring elements having an outer ring, an inner ring, and elastomeric material extending between and adhered to said rings, said inner and outer rings being substantially parallel to said longitudinal axis;

means for connecting said outer rings to an outer support member;

means for connecting said inner rings to an inner support member;

at least one reaction element positioned between an adjacent pair of said ring elements, said reaction element extending from one of said inner or outer rings into a space between the elastomeric materials of said pair of adjacent ring elements, said reaction element having reaction surfaces facing the adjacent surfaces of each of said adjacent elastomeric materials; and

at least one of said reaction surfaces and surface of the elastomeric material adjacent thereto being differently contoured.

2. The vibration isolator and shock absorber device of claim 1 wherein:

said one reaction surface and the surface of the elastomeric element adjacent thereto are contoured to define a differential spacing therebetween in the unloaded state.

3. The vibration isolator and shock absorber device of claim 1 including:

means to vent said space between the elastic materials of said pair of ring elements.

4. The vibration isolator and shock absorber device of claim 1 wherein:

a reaction element is positioned between each adjacent pair of ring elements.

5. The vibration isolator and shock absorber device of claim 4 wherein:

said one reaction surface of each reaction element has an increasing area of contact with each adjacent pair of ring elements with correspondingly increasing load.

6. The vibration isolator and shock absorber device of claim 1 wherein:

at least one of said reaction surfaces and adjacent surfaces of said adjacent elastomeric materials be curved.

7. A vibration isolator and shock absorber device including:

a plurality of ring elements in an array, each of said ring elements having an outer ring, an inner ring, and elastomeric material extending between and adhered to said rings;

means for connecting said outer rings to an outer support member;

means for connecting said inner rings to an inner support member;

at least one reaction element positioned between an adjacent pair of said ring elements, said reaction element extending from one of said inner or outer rings into a space between the elastomeric materials of said pair of adjacent ring elements, said reaction element having reaction surfaces facing the adjacent surfaces of each of said adjacent elastomeric materials; and

at least one of said reaction surfaces and surface of the elastomeric material adjacent thereto being differently contoured wherein said one reaction surface and the surface of the elastomeric element adjacent thereto are contoured to define a differential spacing therebetween in the unloaded state.

8. A vibration isolator and shock absorber device including:

a plurality of ring elements in an array, each of said ring elements having an outer ring, an inner ring, and elastomeric material extending between and adhered to said rings;

means for connecting said outer rings to an outer support member;

means for connecting said inner rings to an inner support member;

at least one reaction element positioned between an adjacent pair of said ring elements, said reaction element extending from one of said inner or outer rings into a space between elastomeric materials of said pair of adjacent ring elements, said reaction element having reaction surfaces facing the adjacent surfaces of each of said adjacent elastomeric materials wherein a reaction element is positioned between each adjacent pair of ring elements; and

at least one of said reaction surfaces and surface of the elastomeric material adjacent thereto being differently contoured wherein said one reaction surface of each reaction element has an increasing area of contact with each adjacent pair of ring elements with correspondingly increasing load.