Patent US3791690A successfully refreshed from Google Patents.
US3791690A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gate operating system for concrete buckets
Assignee: Individual
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Filing: 1972-12-26
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Granted: 1974-02-12
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Expires: 1992-12-26
Abstract
Abstract A system for opening and closing the clamshell gates at the bottom of the hopper of a bucket for placing concrete makes use of a receiver tank for storing air under pressure and a pneumatic actuating cylinder. A main pressure line for air under pressure has one branch connected to the opening end of a pneumatic cylinder and another branch connected to the receiving tank. A pneumatic line from the tank is connected to the pneumatic cylinder at the closing end and a pilot valve in the last mentioned line is subject to control by a pilot pneumatic line fed from the main pressure line whereby to vent the closing end of the cylinder when the opening end is in operation.
Inventors
- 👤 L Garlinghouse
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:48
CPC Classifications
E; E04; E04G; E04G21/00; E04G21/02; E04G21/025
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
185 words
A pneumatic system for opening and closing clamshell gates of a concrete placing bucket comprising a receiving tank, a pneumatic cylinder having a chamber, a piston reciprocatably mounted in the chamber separating the chamber into an opening end and a closing end, and a piston rod on said piston adapted to be connected to the clamshell gates, an opening prEssure line for air under pressure from an external source, said opening pressure line having a branch connected to the opening end of the cylinder and a second branch connected to the tank, a closing pressure line connected between the tank and the closing end of the cylinder, a pilot valve in the closing pressure line and a pilot line connected between the opening pressure line and the pilot valve, said pilot valve having a first position exhausting air from the closing end of the cylinder when there is air pressure from an external source in the opening pressure line and a position passing air from the tank to the closing end of the cylinder when there is no air under pressure in the pilot line.
Claim 2
Dependent Claim
185 words
A pneumatic system for opening and closing clamshell gates of a concrete placing bucket comprising a receiving tank, a pneumatic cylinder having a chamber, a piston reciprocatably mounted in the chamber separating the chamber into an opening end and a closing end, and a piston rod on said piston adapted to be connected to the clamshell gates, an opening prEssure line for air under pressure from an external source, said opening pressure line having a branch connected to the opening end of the cylinder and a second branch connected to the tank, a closing pressure line connected between the tank and the closing end of the cylinder, a pilot valve in the closing pressure line and a pilot line connected between the opening pressure line and the pilot valve, said pilot valve having a first position exhausting air from the closing end of the cylinder when there is air pressure from an external source in the opening pressure line and a position passing air from the tank to the closing end of the cylinder when there is no air under pressure in the pilot line.
Claim 3
Dependent Claim
82 words
A pneumatic system as in claim 1 wherein said opening pressure line has a quick exhaust valve therein at a location between the connection of the pilot line to the opening pressure line and the connection to the cylinder, said quick release valve having a closed position when there is air under pressure from an external source in the opening pressure line and a release position when there is no air under pressure from an external source in the opening pressure line.
Claim 4
Dependent Claim
56 words
A system for opening and closing clamshell gates as in claim 1 wherein there is a check valve in the branch connected to the tank opening in a direction toward the tank and a check valve in the closing pressure line between the tank and the pilot valve opening in a direction toward the pilot valve.
Claim 5
Dependent Claim
30 words
A system for opening and closing clamshell gates as in claim 1 wherein there is a pressure regulator in the closing pressure line between the tank and the pilot valve.
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) | 1977-02-11 | 1977-08-13 | 1978-02-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-11 | 1981-08-13 | 1982-02-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-11 | 1985-08-13 | 1986-02-12 | $7700.00 | Window Closed / Lapsed |