Patent US3741560A successfully refreshed from Google Patents.
US3741560A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dampened shock absorbing bumper
Assignee: Motors Liquidation Co
•
Filing: 1971-09-01
•
Granted: 1973-06-26
•
Expires: 1991-09-01
Abstract
Abstract An impact energy absorbing device includes a cylinder, a generally cup-shaped friction shoe slidable in the cylinder, a ram received in one end of the cylinder and having a bulletshaped nose which is slidably received in the cup-shaped friction shoe, an elastomeric material filling a space between the bulletshaped nose and the friction shoe, and spring means acting between the friction shoe and the other end of the cylinder to yieldably resist telescoping movement of the ram and friction shoe into the cylinder upon application of impact force thereto so that the friction shoe is radially expanded against the cylinder by radial displacement of the elastomeric material.
Inventors
- 👤 A Schaller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:57
CPC Classifications
B; B60; B60R; B60R19/00; B60R19/02; B60R19/24; B60R19/26; B60R19/30
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
167 words
An energy absorber comprising: a tubular member; a generally cup-shaped friction shoe slidable in the tubular member and radially expandible to frictionally engage the walls thereof; a ram slidably guided in the tubular member and having a bulletnosed end slidably received in the cup-shaped friction shoe, the ram being telescopable within the tubular member when subjected to impact forces; a spreader of relatively incompressible material of low elastic modulus filling the space between the ram and the cup-shaped friction shoe; and spring means acting between the friction shoe member and the other end of the tubular member and yieldably resisting movement of the friction shoe into the tubular member when impact force telescopes the ram into the tubular member whereby the bullet-nosed end of the ram radially cams the spreader against the cup-shaped friction shoe member and also axially compresses the spreader causing radial displacement thereof to force the friction shoe member against the cylinder whereby telescoping movement of the ram into the tubular member is impeded.
Claim 2
Dependent Claim
167 words
An energy absorber comprising: a tubular member; a generally cup-shaped friction shoe slidable in the tubular member and radially expandible to frictionally engage the walls thereof; a ram slidably guided in the tubular member and having a bulletnosed end slidably received in the cup-shaped friction shoe, the ram being telescopable within the tubular member when subjected to impact forces; a spreader of relatively incompressible material of low elastic modulus filling the space between the ram and the cup-shaped friction shoe; and spring means acting between the friction shoe member and the other end of the tubular member and yieldably resisting movement of the friction shoe into the tubular member when impact force telescopes the ram into the tubular member whereby the bullet-nosed end of the ram radially cams the spreader against the cup-shaped friction shoe member and also axially compresses the spreader causing radial displacement thereof to force the friction shoe member against the cylinder whereby telescoping movement of the ram into the tubular member is impeded.
Claim 3
Dependent Claim
159 words
An energy absorber comprising: a cylinder; a generally cup-shaped friction shoe slidable in the cylinder, the walls thereof being slit at circumferential intervals to permit radial expansion into frictional engagement with the cylinder; a ram slidably guided in the cylinder and having a bullet-nosed end slidably received in the cup-shaped friction shoe, the ram being telescopable within the cylinder when subjected to impact forces; an elastomeric spreader filling the space between the ram and the cup-shaped friction shoe; and spring means acting between the friction shoe and the other end of the cylinder and yieldably resisting movement of the friction shoe into the cylinder when impact force telescopes the ram into the cylinder whereby the bullet-nosed end cams the spreader radially outward against the walls of the friction shoe and also axially compresses the spreader causing further radial displacement thereof to load the friction shoe against the cylinder and thereby impede telescoping movement between the cylinder and the ram.
Claim 4
Dependent Claim
159 words
An energy absorber comprising: a cylinder; a generally cup-shaped friction shoe slidable in the cylinder, the walls thereof being slit at circumferential intervals to permit radial expansion into frictional engagement with the cylinder; a ram slidably guided in the cylinder and having a bullet-nosed end slidably received in the cup-shaped friction shoe, the ram being telescopable within the cylinder when subjected to impact forces; an elastomeric spreader filling the space between the ram and the cup-shaped friction shoe; and spring means acting between the friction shoe and the other end of the cylinder and yieldably resisting movement of the friction shoe into the cylinder when impact force telescopes the ram into the cylinder whereby the bullet-nosed end cams the spreader radially outward against the walls of the friction shoe and also axially compresses the spreader causing further radial displacement thereof to load the friction shoe against the cylinder and thereby impede telescoping movement between the cylinder and the ram.
Claim 5
Dependent Claim
151 words
An energy absorber comprising: a cylinder; a generally cup-shaped friction shoe slidable in the cylinder and having walls frictionally engageable with the walls of the cylinder; a ram slidably guided in the cylinder and having a bullet-nosed end slidably received in the cup-shaped friction shoe, the ram being telescopablE within the cylinder when subjected to impact forces; an elastomeric spreader filling the space between the ram and the cup-shaped friction shoe; and microcellular foam filling the space between the friction shoe and the other end of the cylinder and yieldably resisting movement of the friction shoe into the cylinder when impact force telescopes the ram into the cylinder whereby the bullet-nosed end cams the spreader radially outward against the friction shoe and also axially compresses the spreader causing further radial displacement thereof to load the friction shoe against the cylinder and thereby impede telescoping movement between the cylinder and the ram.
Claim 6
Dependent Claim
151 words
An energy absorber comprising: a cylinder; a generally cup-shaped friction shoe slidable in the cylinder and having walls frictionally engageable with the walls of the cylinder; a ram slidably guided in the cylinder and having a bullet-nosed end slidably received in the cup-shaped friction shoe, the ram being telescopablE within the cylinder when subjected to impact forces; an elastomeric spreader filling the space between the ram and the cup-shaped friction shoe; and microcellular foam filling the space between the friction shoe and the other end of the cylinder and yieldably resisting movement of the friction shoe into the cylinder when impact force telescopes the ram into the cylinder whereby the bullet-nosed end cams the spreader radially outward against the friction shoe and also axially compresses the spreader causing further radial displacement thereof to load the friction shoe against the cylinder and thereby impede telescoping movement between the cylinder and the ram.
References Cited (Backward Citations)
US996207A
Cited
US1648394A
Cited
US2917265A
Cited
US3053526A
Cited
US3140080A
Cited
US3379317A
Cited
US3379319A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-06-25 | 1976-12-25 | 1977-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-25 | 1980-12-25 | 1981-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-25 | 1984-12-25 | 1985-06-26 | $7700.00 | Window Closed / Lapsed |