US4347743A
Expired / Lapsed
US
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Accelerometer mounting assembly
Assignee: Pile Dynamics Inc
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Filing: 1980-09-18
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Granted: 1982-09-07
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Expires: 2000-09-18
Abstract
Abstract An accelerometer assembly is disclosed which includes an accelerometer mounting block formed of a rigid material having a proportion of the modulus of elasticity to the density of less than 15,000,000 psi/lb/in 3 . The natural frequency of the mounting block is safely below the accelerometer's response frequency but higher than the frequency to be recorded so that the mounting block does not resonate with high frequency vibrations and cause quick saturation of the accelerometer amplifier or erratic signals. The preferred mounting block is formed of polycarbonate, which is non-metallic, rigid, and lightweight, and has a natural frequency sufficiently below that of the accelerometer.
Inventors
- 👤 Frank Rausche
- 👤 Garland E. Likins, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 18:40
CPC Classifications
G; G01; G01P; G01P15/00; G01P15/02; G01P15/08; G01P15/09; G01N; G01N2291/00; G01N2291/02; G01N2291/028; G01N2291/02827
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
69 words
An accelerometer assembly for attachment to a specimen to be monitored for acceleration which comprises: a mounting block capable of attachment to the specimen, the block formed of a rigid material, the proportion of the modulus of elasticity to the density of the material being less than 15,000,000 psi/lb/in 3 ; and an accelerometer mounted to the block, the accelerometer having a natural frequency of greater than 30,000 Hertz.
Claim 2
Dependent Claim
69 words
An accelerometer assembly for attachment to a specimen to be monitored for acceleration which comprises: a mounting block capable of attachment to the specimen, the block formed of a rigid material, the proportion of the modulus of elasticity to the density of the material being less than 15,000,000 psi/lb/in 3 ; and an accelerometer mounted to the block, the accelerometer having a natural frequency of greater than 30,000 Hertz.
Claim 3
Dependent Claim
15 words
An accelerometer assembly as defined in claim 1, wherein the mounting block material is non-metallic.
Claim 4
Dependent Claim
15 words
An accelerometer assembly as defined in claim 2, wherein the mounting block material is polycarbonate.
Claim 5
Dependent Claim
15 words
An accelerometer assembly as defined in claim 1, wherein the accelerometer is a piezoelectric accelerometer.
Claim 6
Dependent Claim
24 words
An accelerometer assembly as defined in claim 1, wherein the mounting block material has a density of less than 0.2 pounds per cubic inch.
Claim 7
Dependent Claim
26 words
An accelerometer assembly as defined in claim 1, wherein the mounting block material has a modulus of elasticity of greater than 100,000 pounds per square inch.
Claim 8
Dependent Claim
19 words
An accelerometer assembly as defined in claim 1, wherein the mounting block is between 0.5 and 3 inches long.
Claim 9
Dependent Claim
22 words
An accelerometer assembly as defined in claim 7, wherein the mounting block is between 0.25 and 2 inches wide on each side.
Claim 10
Dependent Claim
116 words
An accelerometer assembly for attachment to a specimen to be monitored for acceleration which comprises: a mounting block capable of attachment to the specimen, the block being between 0.5 and 3 inches long and between 0.25 and 2 inches wide on each side, the block formed of polycarbonate material, the proportion of the modulus of elasticity to the density of the material being less than 15,000,000 psi/lb/in 3 , the density of the material being less than 0.2 pounds per cubic inch, the modulus of elasticity of the material being greater than 100,000 pounds per square inch; and a piezoelectric accelerometer mounted to the block, the accelerometer having a natural frequency of greater than 30,000 Hertz.
Claim 11
Dependent Claim
116 words
An accelerometer assembly for attachment to a specimen to be monitored for acceleration which comprises: a mounting block capable of attachment to the specimen, the block being between 0.5 and 3 inches long and between 0.25 and 2 inches wide on each side, the block formed of polycarbonate material, the proportion of the modulus of elasticity to the density of the material being less than 15,000,000 psi/lb/in 3 , the density of the material being less than 0.2 pounds per cubic inch, the modulus of elasticity of the material being greater than 100,000 pounds per square inch; and a piezoelectric accelerometer mounted to the block, the accelerometer having a natural frequency of greater than 30,000 Hertz.
Claim 12
Dependent Claim
30 words
An accelerometer assembly as defined in claim 1 or 9, wherein the accelerometer has lead wires extending therefrom and the mounting block has clamp means for attaching the lead wires.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-09-06 | 1986-03-08 | 1986-09-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-09-06 | 1990-03-08 | 1990-09-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-09-06 | 1994-03-08 | 1994-09-07 | $7700.00 | Window Closed / Lapsed |