US3888205A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Article having a sight glass and method of making the same
Assignee: Parker Hannifin Corp
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Filing: 1973-11-12
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Granted: 1975-06-10
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Expires: 1993-11-12
Abstract
Abstract An article comprising a metal member having a sight glass mounted therein. The metal member has a bore and a counterbore with an opening in between that is smaller in diameter than either whereby there is a transverse surface at each end of the opening. The sight glass is fused to the walls of the counterbore and opening but does not extend into the bore radially outwardly of the opening. The invention also embraces the method of fusing a sight glass into a metal part which comprises the steps of providing a metal part as described above, inserting a glass disk in the counterbore, applying heat to the parts that is high enough to simultaneously braze other metallic parts to the metal part and to soften the glass so that it will flow by gravity into fused contact with the wall of the counterbore and also flow into the bore but will be limited in its flow through the opening by cohesive forces in the glass that prevents the glass from flowing radially outwardly along the transverse surface between the bore and opening.
Inventors
- 👤 Julius M Vitticore
- 👤 David N Mooney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 21:16
CPC Classifications
C; C03; C03C; C03C27/00; C03C27/02
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
191 words
The method of fusing a glass disk to a metal part comprising the steps of providing the metal part with a bore, an opening and a counterbore, the opening being between and intersecting the bore and the counterbore and smaller in diameter than either so as to form a first transverse surface between the opening and the bore and a second transverse surface between the opening the counterbore, providing a glass disk having a diameter slightly smaller than the counterbore, placing the glass disk within the counterbore, supporting said part in a position with the counterbore above the opening, and subjecting the glass disk to heat sufficiently high to soften the glass so that it will flow downwardly by gravity into thE opening into engagement with the wall thereof and be limited in such downward flow by cohesive forces in the glass that substantially prevent the glass from flowing radially outwardly along said first transverse surface and whereby a portion of the softened glass disk will remain in the counterbore and gravity will cause it to flow radially outwardly into contact with the wall of said counterbore and become fused thereto.
Claim 2
Independent Claim
191 words
The method of fusing a glass disk to a metal part comprising the steps of providing the metal part with a bore, an opening and a counterbore, the opening being between and intersecting the bore and the counterbore and smaller in diameter than either so as to form a first transverse surface between the opening and the bore and a second transverse surface between the opening the counterbore, providing a glass disk having a diameter slightly smaller than the counterbore, placing the glass disk within the counterbore, supporting said part in a position with the counterbore above the opening, and subjecting the glass disk to heat sufficiently high to soften the glass so that it will flow downwardly by gravity into thE opening into engagement with the wall thereof and be limited in such downward flow by cohesive forces in the glass that substantially prevent the glass from flowing radially outwardly along said first transverse surface and whereby a portion of the softened glass disk will remain in the counterbore and gravity will cause it to flow radially outwardly into contact with the wall of said counterbore and become fused thereto.
Claim 3
Dependent Claim
16 words
The method of claim 1 in which said heat is of a temperature of about 2025*F.
Claim 4
Dependent Claim
41 words
The method of of claim 1 in which said second transverse surface makes an obtuse angle with the wall of said counterbore, said opening is about one-half the diameter of said counterbore, and the temperature of said heat is about 2025*F.
Claim 5
Dependent Claim
56 words
The method of claim 1 in which said metal part has another surface against which another metal article is received, and said another metal article is brazed to the metal part at said another surface by heat applied to said metal article and metallic part simultaneously with the application of heat for softening said glass disk.
Claim 6
Dependent Claim
49 words
The method of claim 4 in which said brazing is by means of a braze material that includes copper and said heat for softening the glass is from a source that also provides the heat for said brazing and is of a temperature sufficiently high to achieve said brazing.
Claim 7
Independent Claim
267 words
The method of fusing a glass disk to a metal part comprising the steps of providing the metal part with a bore, an opening, and a counterbore, the opening being between and intersecting the bore and counterbore and smaller in diameter than either so as to form a first transverse surface between the opening and the bore and a second transverse surface between the opening and the counterbore, said first transverse surface being at an angle of substantially 90* with the wall of the opening and the second transverse surface being substantially at an angle of 102* with the wall of the counterbore, the corner between the first transverse surface and the wall of the opening being sharp with a break of no more than about 0.005 inch, providing a glass disk having a diameter about 0.020 inch less than that of the counterbore, placing the glass disk in said counterbore adjacent said second transverse surface, supporting the part in a position with the counterbore above the opening, and subjecting the glass disk to a temperature of about 2025*F whereby the glass will be softened and a portion of the glass is caused by gravity to flow radially outwardly into fusing contact with the wall of the counterbore and form a meniscus thereagainst and another portion is caused by gravity to flow downwardly from said counterbore into said opening and into fusing contact with the wall thereof, and such softening being only to the extent that cohesive forces within the glass will prevent the glass from flowing around such corner into contact with said first transverse surface.
Claim 8
Independent Claim
267 words
The method of fusing a glass disk to a metal part comprising the steps of providing the metal part with a bore, an opening, and a counterbore, the opening being between and intersecting the bore and counterbore and smaller in diameter than either so as to form a first transverse surface between the opening and the bore and a second transverse surface between the opening and the counterbore, said first transverse surface being at an angle of substantially 90* with the wall of the opening and the second transverse surface being substantially at an angle of 102* with the wall of the counterbore, the corner between the first transverse surface and the wall of the opening being sharp with a break of no more than about 0.005 inch, providing a glass disk having a diameter about 0.020 inch less than that of the counterbore, placing the glass disk in said counterbore adjacent said second transverse surface, supporting the part in a position with the counterbore above the opening, and subjecting the glass disk to a temperature of about 2025*F whereby the glass will be softened and a portion of the glass is caused by gravity to flow radially outwardly into fusing contact with the wall of the counterbore and form a meniscus thereagainst and another portion is caused by gravity to flow downwardly from said counterbore into said opening and into fusing contact with the wall thereof, and such softening being only to the extent that cohesive forces within the glass will prevent the glass from flowing around such corner into contact with said first transverse surface.
Claim 9
Dependent Claim
190 words
An article of manufacture comprising a metal part having a bore, an opening, and a counterbore, the opening being between the bore and counterbore and smaller in diameter than either and being about one-half the diameter of the counterbore, a first transverse surface between the bore and opening having a radial width of at least 0.020 inch and intersecting the opening at a corner of substantially no more than 0.005 inch brake and making an angle with the wall of said opening of no more than about 90*, a second transverse surface between the opening and a circumferential wall of the counterbore and lying in a cone, and a glass disk in said counterbore and opening and fused to the circumferential walls thereof and to said second transverse surface, the disk extending to said first transverse surface but not appreciably radially overlapping the same, and said disk where fused to said counterbore circumferential wall having a meniscus also fused to said counterbore circumferential wall, the meniscus being on thE side of the disk remote from said opening and axially spaced from the end of the counterbore remote from the opening.
Claim 10
Dependent Claim
190 words
An article of manufacture comprising a metal part having a bore, an opening, and a counterbore, the opening being between the bore and counterbore and smaller in diameter than either and being about one-half the diameter of the counterbore, a first transverse surface between the bore and opening having a radial width of at least 0.020 inch and intersecting the opening at a corner of substantially no more than 0.005 inch brake and making an angle with the wall of said opening of no more than about 90*, a second transverse surface between the opening and a circumferential wall of the counterbore and lying in a cone, and a glass disk in said counterbore and opening and fused to the circumferential walls thereof and to said second transverse surface, the disk extending to said first transverse surface but not appreciably radially overlapping the same, and said disk where fused to said counterbore circumferential wall having a meniscus also fused to said counterbore circumferential wall, the meniscus being on thE side of the disk remote from said opening and axially spaced from the end of the counterbore remote from the opening.
Claim 11
Dependent Claim
51 words
The article of claim 7 in which said opening is in another metal part located within said counterbore, said counterbore has a bottom wall, said second transverse surface is an end face of said another metal part, and said another metal part has another end face engaging the counterbore bottom wall.
References Cited (Backward Citations)
US3347651A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-06-09 | 1978-12-09 | 1979-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-09 | 1982-12-09 | 1983-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-09 | 1986-12-09 | 1987-06-10 | $7700.00 | Window Closed / Lapsed |