Patent US3744684A successfully refreshed from Google Patents.
US3744684A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stopper holder for a casting ladle
Assignee: Sulzer AG
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Filing: 1971-10-27
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Granted: 1973-07-10
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Expires: 1991-10-27
Abstract
Abstract The holder uses two parallel links to control the lifting and lowering of the stopper. The lower link is longer so as to pivot with a longer pivot arm. This allows the stopper to move as straight as possible. Also, the actuating lever is connected over a toggle to the upper link so that a relatively great force is applied to lift the stopper initially with a small movement of the toggle. This allows fine metering of the casting stream.
Inventors
- 👤 J Heimgartner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 17:46
CPC Classifications
B; B22; B22D; B22D41/00; B22D41/14; B22D41/16; B22D41/20
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
114 words
A stopper holder for a casting ladle having a bottom outlet comprising: a holding column for securement relative to the ladle; a sleeve spaced from and parallel to said column for mounting a stopper rod therein; a pair of rocker links, each pivotally connected at one end to said column and at an opposite end to said sleeve, said links being vertically spaced from each other; a toggle lever linked to one of said rocker links; and an actuating lever linked to said toggle lever at one end thereof whereby upon downward movement of said actuating element said toggle lever pivots said one rocker link to lift said sleeve in a substantially vertical direction.
Claim 2
Dependent Claim
114 words
A stopper holder for a casting ladle having a bottom outlet comprising: a holding column for securement relative to the ladle; a sleeve spaced from and parallel to said column for mounting a stopper rod therein; a pair of rocker links, each pivotally connected at one end to said column and at an opposite end to said sleeve, said links being vertically spaced from each other; a toggle lever linked to one of said rocker links; and an actuating lever linked to said toggle lever at one end thereof whereby upon downward movement of said actuating element said toggle lever pivots said one rocker link to lift said sleeve in a substantially vertical direction.
Claim 3
Dependent Claim
88 words
A stopper holder as set forth in claim 1 wherein the upper rocker-link of said rocker links is of shorter length than the pivot arm (a) of the lower rocker-link of said rocker links to have a smaller pivot arm, whereby, assuming a short travel (h), of the stopper rod a ratio of distance h to pivot arm a of < or = 1:5, the lengths of said two pivot arms are inversely proportionally to their spacings from the lower edge of a stopper on said stopper rod.
Claim 4
Dependent Claim
35 words
A stopper holder as set forth in claim 1 which further includes a pulling means for biasing said actuating element in a closing direction and a stop for limiting a closing motion of said holder.
Claim 5
Dependent Claim
112 words
A stopper holder as set forth in claim 1 wherein said toggle lever is pivotally mounted on said rocker link at a first pivot point, an actuating lever is pivotally mounted on said column at a second pivot point and is pivotally connected to said toggle lever at said second pivot point, and said toggle lever has two parts pivotally connected at a third pivot point, said pivot points lying in a straight line with said stopper rod in a closed position and forming an angle of less than 180* which lies with said first pivot point as the vertex and which opens towards said rocker tube when said sleeve is lifted.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-09 | 1977-01-08 | 1977-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-09 | 1981-01-08 | 1981-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-09 | 1985-01-08 | 1985-07-10 | $7700.00 | Window Closed / Lapsed |