Patent US3597960A successfully refreshed from Google Patents.
US3597960A
Expired / Lapsed
US
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High intensity mechanical shock testing machine
Assignee: Northrop Grumman Space and Mission Systems Corp
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Filing: 1969-02-14
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Granted: 1971-08-10
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Expires: 1989-02-14
Abstract
Abstract A mechanical shock testing machine for shock testing an object with high intensity forces over a wide frequency spectrum. The machine includes a test platform connected to a rigid support by a pair of columns having a predetermined mechanical resonance. These columns provide a restraining force. The shock is applied by exerting a large force on an extruded piece of metal having a predetermined yield point and having a reduced central portion defining a rupture area. By applying sufficient force to the extruded metal piece until it breaks, a predetermined force of short duration is applied to the test platform. The platform now vibrates in accordance with the mechanical resonance of the system. The system may be damped by applying a damping force to the platform. The invention herein described was made in the course of or under a contract or subcontract thereunder with the Department of the Air Force.
Inventors
- 👤 John M Otera
- 👤 James R Dowling
- 👤 Rudolph V Mendoza
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 19:34
CPC Classifications
G; G01; G01N; G01N3/00; G01N3/30
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
94 words
A mechanical shock testing machine for subjecting an object to high forces over a wide frequency spectrum comprising: a. a rigid support; b. a test platform for shock testing the object; c. an element having a predetermined mechanical resonance for connecting said test platform to said rigid support and providing a restraining force; d. means connectable to said platform for imparting a predetermined force of short duration to said test platform; and e. adjustable means acting on said platform for frictionally damping mechanical vibrations of said platform imparted thereto by said means for imparting.
Claim 2
Dependent Claim
94 words
A mechanical shock testing machine for subjecting an object to high forces over a wide frequency spectrum comprising: a. a rigid support; b. a test platform for shock testing the object; c. an element having a predetermined mechanical resonance for connecting said test platform to said rigid support and providing a restraining force; d. means connectable to said platform for imparting a predetermined force of short duration to said test platform; and e. adjustable means acting on said platform for frictionally damping mechanical vibrations of said platform imparted thereto by said means for imparting.
Claim 3
Dependent Claim
65 words
A testing machine as defined in claim 1 wherein said means for imparting a predetermined force includes an elongated member having a predetermined yield point, one portion of said member being connected to said test platform, and means connected to another portion of said member for exerting sufficient force on said member to break it, thereby to impart a predetermined force on said test platform.
Claim 4
Dependent Claim
42 words
A testing machine as defined in claim 1 wherein said element consists of at least one column having a reduced center portion for providing a predetermined mechanical frequency response to the system consisting of said test platform, said column and the object.
Claim 5
Dependent Claim
37 words
A testing machine as defined in claim 1 wherein said adjustable means consists of a pair of hydraulic jacks capable of exerting an adjustable friction force on said test platform to provide a predetermined amount of damping.
Claim 6
Dependent Claim
173 words
A mechanical shock testing machine for subjecting an object to a high force over a predetermined wide frequency spectrum comprising: a. a rigid support; b. a test platform for shock testing the object; c. an element having a predetermined mechanical resonance for permanently connecting said test platform to said rigid support and providing a restraining force; d. an elongated member having an upper and a lower portion and a reduced cross section there between and providing a predetermined yield point; E. means secured to said test platform for rigidly gripping the upper portion of said elongated member; f. further means for rigidly gripping the lower portion of said elongated member; g. means connected to said further means for exerting a predetermined force on said elongated member until said member breaks, thereby imparting a predetermined shock force of short duration to said platform and thereafter causing mechanical vibration of said test platform; and h. additional means connected between said rigid support and said platform for exerting a predetermined frictional damping force on said platform.
Claim 7
Dependent Claim
173 words
A mechanical shock testing machine for subjecting an object to a high force over a predetermined wide frequency spectrum comprising: a. a rigid support; b. a test platform for shock testing the object; c. an element having a predetermined mechanical resonance for permanently connecting said test platform to said rigid support and providing a restraining force; d. an elongated member having an upper and a lower portion and a reduced cross section there between and providing a predetermined yield point; E. means secured to said test platform for rigidly gripping the upper portion of said elongated member; f. further means for rigidly gripping the lower portion of said elongated member; g. means connected to said further means for exerting a predetermined force on said elongated member until said member breaks, thereby imparting a predetermined shock force of short duration to said platform and thereafter causing mechanical vibration of said test platform; and h. additional means connected between said rigid support and said platform for exerting a predetermined frictional damping force on said platform.
Claim 8
Dependent Claim
29 words
A testing machine as defined in claim 5 wherein said means connected to said further means includes a hydraulic jack connected between said rigid support and said further means.
Claim 9
Dependent Claim
18 words
A testing machine as defined in claim 5 wherein said damping means includes a pair of hydraulic jacks.
Claim 10
Dependent Claim
56 words
A testing machine as defined in claim 5 wherein said elongated member consists of an extruded metal having a predetermined yield point and having a central portion of reduced cross section along the entire length thereof which defines the rupture area, whereby the force exerted on said platform is determined by the length of said member.
Claim 11
Dependent Claim
56 words
A testing machine as defined in claim 5 wherein said element consists of a pair of columns between said rigid support and said test platform, each of said columns having a reduced central portion for providing a predetermined mechanical resonant spectrum of the system consisting of said platform, said columns and the object to be tested.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-08-09 | 1975-02-08 | 1975-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-09 | 1979-02-08 | 1979-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-09 | 1983-02-08 | 1983-08-10 | $7700.00 | Window Closed / Lapsed |