US3885618A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ventilation valve for closing a ventilation duct in a casting mold
Assignee: FONDAREX F HODLER & CIE SA AV DE COLLONGE 28 CH 1820 MONTREAUX A SWISS Corp
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Filing: 1973-06-25
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Granted: 1975-05-27
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Expires: 1993-06-25
Abstract
Abstract A ventilation valve for closing a ventilation duct in a casting mold, the valve comprising a valve cylinder; a valve piston slidingly received by the valve cylinder so as to be movable between an open and a closed position in a direction perpendicular with respect to said ventilation duct, said valve closing in the direction of the pressure exerted onto the surface of said piston which faces said ventilation duct, a displacement member which urges the piston into its open position when the mold is open; and means actuated by closure of the mold to move the displacement member away from the piston so that the piston can be brought to its closed position without being hindered by the displacement member load.
Inventors
- 👤 Fritz Hodler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:20
CPC Classifications
B; B22; B22D; B22D17/00; B22D17/14; Y; Y10; Y10S; Y10S425/00; Y10S425/812
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
125 words
A ventilation valve for closing a ventilation duct in a casting mold, the valve comprising a valve cylinder; a valve piston slidingly received by the valve cylinder so as to be movable between an open and a closed position in a direction perpendicular with respect to said ventilation duct, said valve closing in the direction of the pressure exerted by casting material onto the surface of said piston which faces said ventilation duct, a displacement member which urges the piston into its open position when the mold is open; and means actuated by closure of the mold to move the displacement member away from the piston so that the piston can be brought to its closed position without being hindered by the displacement member load.
Claim 2
Dependent Claim
125 words
A ventilation valve for closing a ventilation duct in a casting mold, the valve comprising a valve cylinder; a valve piston slidingly received by the valve cylinder so as to be movable between an open and a closed position in a direction perpendicular with respect to said ventilation duct, said valve closing in the direction of the pressure exerted by casting material onto the surface of said piston which faces said ventilation duct, a displacement member which urges the piston into its open position when the mold is open; and means actuated by closure of the mold to move the displacement member away from the piston so that the piston can be brought to its closed position without being hindered by the displacement member load.
Claim 3
Dependent Claim
22 words
A ventilation valve as claimed in claim 1, in which the displacement member is spring-loaded towards the direction of the valve piston.
Claim 4
Dependent Claim
60 words
A ventilation valve as claimed in claim 1, in which said means to Move the displacement member comprises at least one slidable member, one end of which bears against the displacement member and the other end of which projects from the valve body so as to be engageable with part of the mold during closure to move the displacement member.
Claim 5
Dependent Claim
38 words
A ventilation valve as claimed in claim 3, including a piston plate on the valve piston arranged to allow actuation of the piston by a hydraulic or pneumatic pressure medium, the slidable member passing slidably through the plate.
Claim 6
Dependent Claim
36 words
A ventilation valve as claimed in claim 4, in which the end of the slidable member which bears against the displacement member is provided with a stop interposed between the piston plate and the displacement member.
Claim 7
Dependent Claim
49 words
A ventilation valve as claimed in claim 1, in which the displacement member comprises a plate which is axially displaceable in the valve cylinder behind the valve piston, the plate supporting at the side remote from the valve piston a coaxial guide shaft which slides in a guiding bore.
Claim 8
Dependent Claim
31 words
A ventilation valve as claimed in claim 6, in which the guiding bore is a blind bore substantially deeper than the length of the piston stroke necessary to close the valve.
Claim 9
Dependent Claim
22 words
A ventilation valve as claimed in claim 1, in which the displacement member is urged towards the piston by a compression spring.
Claim 10
Dependent Claim
24 words
A ventilation valve as claimed in claim 8, in which the compression spring abuts against a bolt which is screwed into the valve cylinder.
Claim 11
Dependent Claim
39 words
A ventilation valve as claimed in claim 1, in which the valve piston is a plunger piston with a sealing piston head and, when housed in a valve cylinder without a valve seat, closes exclusively by means of plunging.
Claim 12
Dependent Claim
50 words
A ventilation valve as claimed in claim 10, in which upon closure of the valve piston with its sealing piston head enters the valve cylinder to such an extent that its front face, which is to be acted on by casting material is located just inside the valve cylinder bore.
Claim 13
Dependent Claim
27 words
A ventilation valve as claimed in claim 10, in which the front face of the piston head is inclined radially outwardly in opposition to the casting pressure.
Claim 14
Dependent Claim
20 words
A ventilation valve as claimed in claim 12, in which the front face of the piston head has curved recesses.
Claim 15
Dependent Claim
52 words
A ventilation valve as claimed in claim 12, in which the radially projecting part of the piston head is resiliently flexible so that it may be pressed against the wall of the valve cylinder by means of the pressure of the casting material acting on the front face of the piston head.
Claim 16
Dependent Claim
33 words
A ventilation valve as claimed in claim 10, in which the peripheral wall of the radially projecting part of the piston head tapers in the closure direction of the axis of the piston.
Claim 17
Dependent Claim
80 words
A ventilation valve as claimed in claim 1, in which the part of the mold lying opposite the valve has in the region of the plane of separation a recess which lies opposite the inlet aperture of the valve into which the ventilation duct discharges and which has a greater cross-section than the valve inlet aperture, so that this part of the mold, when the mold is closed does not press directly against the edge of the valve inlet aperture.
Claim 18
Dependent Claim
60 words
A ventilation valve as claimed in claim 2, in which said means to move the displacement member comprises at least one slidable member, one end of which bears against the displacement member and the other end of which projects from the valve body so as to be engageable with part of the mold during closure to move the displacement member.
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) | 1978-05-26 | 1978-11-25 | 1979-05-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-26 | 1982-11-25 | 1983-05-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-26 | 1986-11-25 | 1987-05-27 | $7700.00 | Window Closed / Lapsed |