US3872785A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dual pressure refuse compactor
Assignee: AMF Inc
•
Filing: 1972-11-13
•
Granted: 1975-03-25
•
Expires: 1992-11-13
Abstract
Abstract The shearing stroke is at high psi and then the pressure is reduced about one half to prevent overcompacting. Full pressure is restored on retracting stroke.
Inventors
- 👤 James D Elliott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 16:35
CPC Classifications
B; B30; B30B; B30B15/00; B30B15/08; B30B9/00; B30B9/30; B30B9/3003; B30B9/3057; Y; Y10; Y10T; Y10T83/00; Y10T83/869; Y10T83/8821; Y10T83/8827
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
85 words
A refuse compactor comprising a housing closed at one end by a door, a feed opening in said housing, a ram mounted for reciprocation in said housing, cooperating refuse shearing means on said ram housing, drive means to reciprocate said ram whereby said ram shears refuse at the start of its forward stroke and thereafter compacts the refuse during the remainder of its forward stroke, means for reducing the force driving said ram after said ram shears refuse whereby overcompacting of the refuse is prevented.
Claim 2
Dependent Claim
85 words
A refuse compactor comprising a housing closed at one end by a door, a feed opening in said housing, a ram mounted for reciprocation in said housing, cooperating refuse shearing means on said ram housing, drive means to reciprocate said ram whereby said ram shears refuse at the start of its forward stroke and thereafter compacts the refuse during the remainder of its forward stroke, means for reducing the force driving said ram after said ram shears refuse whereby overcompacting of the refuse is prevented.
Claim 3
Dependent Claim
20 words
In a refuse compactor as in claim 1, means for restoring full force to said ram during its reverse stroke.
Claim 4
Dependent Claim
91 words
In a refuse compactor as in claim 2, a hydraulic actuator for driving said ram, a hydraulic pump, a hydraulic circuit connecting said pump to said actuator for driving the same, said force reducing means comprising a pressure reducing valve, means responsive to the forward stroke position of said ram for connecting said pressure reducing valve in said circuit, and control means operative at the end of the forward stroke of said ram for disconnecting said pressure reducing valve from said circuit whereby full pressure is then restored to said actuator.
References Cited (Backward Citations)
US2095172A
Cited
US3229622A
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US3368478A
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US3580166A
Cited
US3621775A
Cited
US3613556A
Cited
US3687063A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-24 | 1978-09-23 | 1979-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-24 | 1982-09-23 | 1983-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-24 | 1986-09-23 | 1987-03-25 | $7700.00 | Window Closed / Lapsed |