US3749205A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Metal shearing energy absorber
Assignee: Individual
•
Filing: 1971-12-28
•
Granted: 1973-07-31
•
Expires: 1991-12-28
Abstract
Abstract A metal shearing energy absorber is disclosed comprising a flat thin strip of metal which is pulled through a slot in a cutter member of a metal, harder than the metal of the strip. The slot''s length, in the direction perpendicular to the pull direction, is less than the strip''s width so that as the strip is pulled through the slot, its edges are sheared off, thereby absorbing some of the pulling energy. In one embodiment the cutter member is a flat plate of steel, while in another embodiment the cutter member is U-shaped, with the slot at its base.
Inventors
- 👤 J Fletcher
- 👤 R Fay
- 👤 E Wittrock
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 14:21
CPC Classifications
F; F16; F16F; F16F7/00; F16F7/12; F16F7/127
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
143 words
A metal shearing energy absorber comprising: a single flat metal plate defining first and second opposite flat sides and a slot of preselected length and width which extends through said plate from said first side to said second side; and an elongated strip of a material softer than said plate and of a thickness not greater than the width of said slot, said strip having a width, except at a leading end thereof, which is greater than the slot length, with the leading end strip width being not more than the slot length, whereby when said leading end passes through said slot and is pulled away from said plate, the strip width is reduced at both ends thereof to equal said slot length, with the ends beyond the reduced width being sheared off by said plate, as said strip is being pulled therethrough.
Claim 2
Dependent Claim
143 words
A metal shearing energy absorber comprising: a single flat metal plate defining first and second opposite flat sides and a slot of preselected length and width which extends through said plate from said first side to said second side; and an elongated strip of a material softer than said plate and of a thickness not greater than the width of said slot, said strip having a width, except at a leading end thereof, which is greater than the slot length, with the leading end strip width being not more than the slot length, whereby when said leading end passes through said slot and is pulled away from said plate, the strip width is reduced at both ends thereof to equal said slot length, with the ends beyond the reduced width being sheared off by said plate, as said strip is being pulled therethrough.
Claim 3
Dependent Claim
31 words
The arrangEment as recited in claim 1 wherein said slot is slanted between said first and second sides in the direction in which said strip is pulled away from the slot.
Claim 4
Dependent Claim
157 words
A metal shearing energy absorber comprising: a U-shaped metal member defining first and second spaced apart flat walls and a base therebetween and a rectangularly shaped slot of a preselected width and length, extending through said base with the width of said slot extending in a direction perpendicular to said spaced apart walls; an elongated rectangularly shaped strip of a material softer than said member, the strip thickness being not more than the width of said slot and the strip width being greater than the slot length, except for a leading end of said strip which extends out of said member through said slot, whereby when the strip leading end is pulled away from said member, the strip width is reduced at both ends thereof to equal the slot length, with both ends of the strip beyond the slot length being sheared off by said member and tending to curl up between its opposite spaced apart walls.
Claim 5
Dependent Claim
157 words
A metal shearing energy absorber comprising: a U-shaped metal member defining first and second spaced apart flat walls and a base therebetween and a rectangularly shaped slot of a preselected width and length, extending through said base with the width of said slot extending in a direction perpendicular to said spaced apart walls; an elongated rectangularly shaped strip of a material softer than said member, the strip thickness being not more than the width of said slot and the strip width being greater than the slot length, except for a leading end of said strip which extends out of said member through said slot, whereby when the strip leading end is pulled away from said member, the strip width is reduced at both ends thereof to equal the slot length, with both ends of the strip beyond the slot length being sheared off by said member and tending to curl up between its opposite spaced apart walls.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-30 | 1977-01-29 | 1977-07-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-30 | 1981-01-29 | 1981-07-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-30 | 1985-01-29 | 1985-07-31 | $7700.00 | Window Closed / Lapsed |