US3854922A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Threshold mounted in a molten glass delivery apparatus
Assignee: PPG Industries Inc
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Filing: 1974-03-27
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Granted: 1974-12-17
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Expires: 1994-03-27
Abstract
Abstract An apparatus for mounting a threshold in communication with a glass forming chamber containing molten metal includes a supporting structure and tension members for drawing the threshold against both the supporting structure and the inlet end of a glass forming chamber. The apparatus may also include outboard compression members for urging side members or jambs inwardly against the threshold. The entire assembly is easily removable for repair or replacement, yet a glassmaking apparatus including it is not subject to loss of molten metal due to separation of the threshold from the forming chamber during use.
Inventors
- 👤 J Sensi
- 👤 G Wehner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 09:00
CPC Classifications
C; C03; C03B; C03B5/00; C03B5/16; C03B5/26; C03B5/265; C03B5/267; C03B18/00; C03B18/02; C03B18/04
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
185 words
In a glass forming apparatus comprising a chamber having an inlet end and an outlet end and including a bottom for containing a pool of molten metal, a top roof portion for enclosing a space extending above the pool of molten metal, a lift-off assembly in the outlet end of the glass forming chamber for removing a continuous sheet of glass from the chamber, means for sealing the enclosed chamber from the outside environment and means at the inlet end of the glass forming chamber for connecting the glass forming chamber to a glassmaking furnace for delivering molten glass therefrom to the glass forming chamber, the improvement comprising: a. an impervious structure connected to an impervious casing extending from the inlet end of the glass forming chamber beneath the bottom portion of the glass forming chamber; b. a threshold member resting on the impervious structure and disposed transversely across the inlet end of the glass forming chamber, wherein the threshold member extends above the level for molten metal; and c. means for urging the threshold member against the bottom portion of the glass forming chamber.
Claim 2
Dependent Claim
185 words
In a glass forming apparatus comprising a chamber having an inlet end and an outlet end and including a bottom for containing a pool of molten metal, a top roof portion for enclosing a space extending above the pool of molten metal, a lift-off assembly in the outlet end of the glass forming chamber for removing a continuous sheet of glass from the chamber, means for sealing the enclosed chamber from the outside environment and means at the inlet end of the glass forming chamber for connecting the glass forming chamber to a glassmaking furnace for delivering molten glass therefrom to the glass forming chamber, the improvement comprising: a. an impervious structure connected to an impervious casing extending from the inlet end of the glass forming chamber beneath the bottom portion of the glass forming chamber; b. a threshold member resting on the impervious structure and disposed transversely across the inlet end of the glass forming chamber, wherein the threshold member extends above the level for molten metal; and c. means for urging the threshold member against the bottom portion of the glass forming chamber.
Claim 3
Dependent Claim
51 words
The apparatus according to claim 1 wherein the means for urging the threshold member against the glass forming chamber comprises a rigid member extending transversely through the threshold member and, connected to the rigid member on each end of the threshold member, a force-applying arm fixedly mounted on a structural member.
Claim 4
Dependent Claim
29 words
The apparatus according to claim 2 wherein the force-applying arms are tension arms, each mounted on a structural member integral to structural support means of the glass forming chamber.
Claim 5
Dependent Claim
37 words
The apparatus according to claim 1 wherein the improvement further comprises side members, one at each end of the threshold member, and means for urging the side members against the bottom portion of the glass forming chamber.
Claim 6
Dependent Claim
63 words
The apparatus according to claim 4 wherein the means for urging the side members against the bottom portion of the glass forming chamber comprises a rigid member extending through the side members and transversely through the threshold member and, connected to the rigid member at each end beyond the end of the threshold member, a force-applying arm fixedly mounted on a structural member.
Claim 7
Dependent Claim
55 words
The apparatus according to claim 5 wherein two rigid members extend through the threshold member and through the side members, one engaging the threshold member and one engaging the side members, and wherein the force-applying arms are connected to both rigid members for urging the combination against the bottom portion of the glass forming chamber.
Claim 8
Dependent Claim
45 words
The apparatus according to claim 4 wherein each side member is shaped to engage an end and a portion of the top of the threshold member and wherein the apparatus further comprises means for urging the side members against the ends of the threshold member.
Claim 9
Dependent Claim
69 words
The apparatus according to claim 7 wherein the means for urging the side members against the ends of the threshold member comprises a tension member extending in substantial alignment with and beyond the ends of the threshold member and compression means connected to the tension member and engaged against a side member such that the side member is between the compression means and the end of the threshold block.
Claim 10
Dependent Claim
60 words
The apparatus according to claim 8 wherein the tension member comprises the threshold member support structure and a pair of vertically extending plates connected thereto, one at each end of the threshold member, and wherein the compression means comprises a compression spring positioned between one of the vertically extending plates of the tension member and the side member adjacent thereto.
Claim 11
Dependent Claim
63 words
The apparatus according to claim 9 wHerein two rigid members extend through the threshold member, through the side members and beyond the vertically extending plates of the tension member, one rigid member engaging the threshold member and one rigid member engaging the side members, and wherein a force-applying arm is connected to each of the two rigid members and to a structural member.
Claim 12
Dependent Claim
22 words
The apparatus according to claim 1 wherein the bottom of the glass forming chamber adjacent the threshold is a cast-in-place refractory material.
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) | 1977-12-16 | 1978-06-17 | 1978-12-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-16 | 1982-06-17 | 1982-12-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-16 | 1986-06-17 | 1986-12-17 | $7700.00 | Window Closed / Lapsed |