US3693274A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Clam shell excavator
Assignee: Individual
•
Filing: 1970-10-13
•
Granted: 1972-09-26
•
Expires: 1990-10-13
Abstract
Abstract A supporting frame cars a pair of pivoted arms which are movable toward and away from each other by fluid operators reacting between the arms nd the frame. A pair of complemental bucket members are pivoted to lower end of the respective arms for movement toward and away from each other independently of the pivotal movement of the arms. The bucket members are moved by fluid operators reacting between the arms and the bucket members. A suction pipe extends through the frame between the arms for picking up material loosened by the bucket members.
Inventors
- 👤 Ugo Piccagli
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 20:02
CPC Classifications
B; B66; B66C; B66C3/00; B66C3/14; B66C3/16; E; E02; E02F; E02F3/00; E02F3/04; E02F3/28; E02F3/36; E02F3/40; E02F3/413
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
181 words
A clam shell excavator, comprising in combination, a supporting frame having a central vertical axis, a pair of pivots provided on said frame adjacent to and at opposite sides of said central axis, a pair of downwardly tapered triangular arms having inner and outer upper corners and a lower corner, said arms being mounted by their inner upper corners on the respective pivots and extending downwardly from said frame, a first pair of fluid operators pivotally mounted within said frame at points remote from said central axis and outwardly beyond said pivots of said arms, said first pair of operators being connected to the outer upper corners of the arms for moving the latter toward and away from said central axis, a pair of complemental bucket members pivoted to the lower corners of the respective arms for movement of the bucket members toward and away from each other independently of the pivotal movement of said arms, and a second pair of fluid operators reacting between the pivots of said arms on said frame and said bucket members for moving the latter.
Claim 2
Dependent Claim
181 words
A clam shell excavator, comprising in combination, a supporting frame having a central vertical axis, a pair of pivots provided on said frame adjacent to and at opposite sides of said central axis, a pair of downwardly tapered triangular arms having inner and outer upper corners and a lower corner, said arms being mounted by their inner upper corners on the respective pivots and extending downwardly from said frame, a first pair of fluid operators pivotally mounted within said frame at points remote from said central axis and outwardly beyond said pivots of said arms, said first pair of operators being connected to the outer upper corners of the arms for moving the latter toward and away from said central axis, a pair of complemental bucket members pivoted to the lower corners of the respective arms for movement of the bucket members toward and away from each other independently of the pivotal movement of said arms, and a second pair of fluid operators reacting between the pivots of said arms on said frame and said bucket members for moving the latter.
Claim 3
Dependent Claim
33 words
The device as defined in claim 1 together with a suction pipe extending through and projecting below said frame between said arms for picking up material loosened by movement of said bucket members.
References Cited (Backward Citations)
US2889642A
Cited
FR1454963A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-09-26 | 1976-03-27 | 1976-09-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-26 | 1980-03-27 | 1980-09-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-26 | 1984-03-27 | 1984-09-26 | $7700.00 | Window Closed / Lapsed |