Patent US3721320A successfully refreshed from Google Patents.
US3721320A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Energy absorption apparatus
Assignee: Individual
•
Filing: 1972-08-26
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Granted: 1973-03-20
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Expires: 1992-08-26
Abstract
Abstract An energy absorption apparatus which includes a body having a cylindrical bore; a soft ductile metallic sleeve mounted in the cylindrical bore; a cylindrical shaft mounted in the sleeve and having an enlarged hard metallic mandrel portion which is capable of drawing through the soft metallic sleeve; and a annular die mounted in the cylindrical bore and having an internal diameter which is larger than the external diameter of the cylindrical portion of the shaft but less than the external diameter of the sleeve. Upon impact loading of the shaft the mandrel draws through the soft metallic sleeve and metal of the sleeve as extruded forward of the mandrel and through the die to absorb the shock energy.
Inventors
- 👤 J Hirsch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 05:20
CPC Classifications
B; B60; B60R; B60R19/00; B60R19/02; B60R19/24; B60R19/26; B60R19/36; F; F16; F16F; F16F7/00; F16F7/12; F16F7/125; B60R19/28; B60R19/285; B60R19/34
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
129 words
An energy absorption apparatus comprising: a body having a cylindrical bore; a soft ductile metallic sleeve slidably mounted in said cylindrical bore so as to be insertable therein or removable therefrom; a cylindrical shaft slidably mounted in the sleeve and having an enlarged hard metallic mandrel portion which is capable of drawing through the soft metallic sleeve; and an annular die mounted in the cylindrical bore and having an internal diameter which is larger than the external diameter of the cylindrical portion of the shaft but less than the external diameter of the sleeve; whereby upon impact loading of the shaft the mandrel draws through the soft metallic sleeve, and metal of the sleeve is extruded forward of the mandrel and through the die to absorb the shock energy
Claim 2
Dependent Claim
129 words
An energy absorption apparatus comprising: a body having a cylindrical bore; a soft ductile metallic sleeve slidably mounted in said cylindrical bore so as to be insertable therein or removable therefrom; a cylindrical shaft slidably mounted in the sleeve and having an enlarged hard metallic mandrel portion which is capable of drawing through the soft metallic sleeve; and an annular die mounted in the cylindrical bore and having an internal diameter which is larger than the external diameter of the cylindrical portion of the shaft but less than the external diameter of the sleeve; whereby upon impact loading of the shaft the mandrel draws through the soft metallic sleeve, and metal of the sleeve is extruded forward of the mandrel and through the die to absorb the shock energy
Claim 3
Dependent Claim
47 words
An apparatus as claimed in claim 1 including: said annular die being mounted adjacent an open end of the cylindrical bore; and one end of the sleeve being adjacent the die and the other end of the sleeve being adjacent the enlarged mandrel end of the shaft.
Claim 4
Dependent Claim
28 words
An apparatus as claimed in claim 1 including: said die and the mandrel portion of the shaft being constructed of steel and said sleeve being constructed of lead.
Claim 5
Dependent Claim
41 words
An apparatus as claimed in claim 1 including: said mandrel end being bulb shaped; said sleeve being internally tapered from a larger diameter to a smaller diameter away from the mandrel; and said annular die being curved across its internal surface.
Claim 6
Dependent Claim
47 words
An apparatus as claimed in claim 4 including: said annular die being mounted adjacent an open end of the cylindrical bore; and one end of the sleeve being adjustment the die and the other end of the sleeve being adjacent the enlarged mandrel end of the shaft.
Claim 7
Dependent Claim
27 words
An apparatus as claimed in claim 5 including: said die and bulb portion of the shaft being constructed of steel and said sleeve being constructed of lead.
Claim 8
Dependent Claim
19 words
An apparatus as claimed in claim 6 including: said die being threaded into the body within said cylindrical bore.
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) | 1976-03-19 | 1976-09-18 | 1977-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-19 | 1980-09-18 | 1981-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-19 | 1984-09-18 | 1985-03-20 | $7700.00 | Window Closed / Lapsed |