US3881595A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Conveyor system for the intermittent forwarding of sand molds
Assignee: Equipment Merchants International (EMI) Inc
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Filing: 1972-12-26
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Granted: 1975-05-06
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Expires: 1992-12-26
Abstract
Abstract A conveyor for sand molds, wherein the molds are caused to move from the inlet end to the discharge end by forcing a mold onto the inlet end, thereby pushing a mold from the discharge end, once the conveyor is completely filled with molds. The conveyor is constructed of a plurality of stationary, spaced, longitudinal slats. Positioned intermediate some of the stationary slats are a plurality of movable slats. During operation, a lifting force is applied beneath the movable slats, which force is something less than that required to lift the string of molds off the upper surface of the stationary slats. This results in less force being necessary to move the mold string from the inlet end towards the outlet end of the conveyor, thus reducing the possibility of crushing or breaking the sand molds.
Inventors
- 👤 Vagn Deve
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 15:10
CPC Classifications
B; B22; B22D; B22D33/00; B22D33/005
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
253 words
A method of operating a conveyor for molds wherein molds are intermittently added to one end of the conveyor, and intermittently removed from the other end thereof, said conveyor having a plurality of stationary, parallel, spaced longitudinal members having flat upper surfaces which lie in a common horizontal plane, and a movable longitudinal means positioned in internesting relationship with the stationary members having a flat upper surface which in a first position lies in the same plane as the upper surfaces of the stationary members, and which in a second position lies beneath the plane of the upper surfaces of the stationary members, both the stationary longitudinal members and the movable longitudinal means extending substantially the entire length of the conveyor, comprising the steps of initially loading the conveyor with molds from one end to the other, applying a predetermined lifting force to the bottom of the movable means, which predetermined lifting force is greater than fifty percent of the weight of the load on the conveyor but less than the total weight of the load on the conveyor so that the molds are not lifted from the upper surfaces of the stationary members, sliding a new mold onto one end of the conveyor, while simultaneously maintaining the predetermined lifting force to the bottom of the lifting means, so that the movable means is moved along with the molds, and thereafter applying a force to move the movable means back to its original position, thereby forcing a mold from the other end thereof.
Claim 2
Independent Claim
253 words
A method of operating a conveyor for molds wherein molds are intermittently added to one end of the conveyor, and intermittently removed from the other end thereof, said conveyor having a plurality of stationary, parallel, spaced longitudinal members having flat upper surfaces which lie in a common horizontal plane, and a movable longitudinal means positioned in internesting relationship with the stationary members having a flat upper surface which in a first position lies in the same plane as the upper surfaces of the stationary members, and which in a second position lies beneath the plane of the upper surfaces of the stationary members, both the stationary longitudinal members and the movable longitudinal means extending substantially the entire length of the conveyor, comprising the steps of initially loading the conveyor with molds from one end to the other, applying a predetermined lifting force to the bottom of the movable means, which predetermined lifting force is greater than fifty percent of the weight of the load on the conveyor but less than the total weight of the load on the conveyor so that the molds are not lifted from the upper surfaces of the stationary members, sliding a new mold onto one end of the conveyor, while simultaneously maintaining the predetermined lifting force to the bottom of the lifting means, so that the movable means is moved along with the molds, and thereafter applying a force to move the movable means back to its original position, thereby forcing a mold from the other end thereof.
Claim 3
Dependent Claim
60 words
The method set forth in claim 1, including the further step of removing the predetermined force from the movable means after it has moved along with the molds, so that its upper surface drops below the plane of the upper surfaces of the stationary members, and thereafter applying said force to move the movable means back to its original position.
Claim 4
Dependent Claim
46 words
The method set forth in claim 1, including the step of applying a horizontal force to the movable means in a direction towards said other end of the conveyor, at the same time a new mold is being slid onto said one end of the conveyor.
References Cited (Backward Citations)
US3221870A
Cited
US3659701A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-05-05 | 1978-11-04 | 1979-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-05 | 1982-11-04 | 1983-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-05 | 1986-11-04 | 1987-05-06 | $7700.00 | Window Closed / Lapsed |