US5110085A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas venting device for foam mold
Assignee: Bridgestone Corp
•
Filing: 1989-11-16
•
Granted: 1992-05-05
•
Expires: 2009-11-16
Abstract
Abstract A gas venting device serves to automatically closing and opening vent holes of a foam mold so that air and reaction product gases are sufficiently exhausted and a foamed product is effectively prevented from extending through the vent holes. The gas venting device includes valves for closing and opening the vent holes, valve driving cylinders for driving the valves, a pilot operated two-position change-over valve, pressure tanks connected through the pilot operated two-position change-over valve to the valve driving cylinders, and mechanical change-over valves connected to the pilot operated two-position change-over valve for changing over it by dogs provided on a passage of the foam mold. The device further includes an air timer for delaying closing the vent holes by the valves.
Inventors
- 👤 Toshio Iwasawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:37
CPC Classifications
B; B29; B29C; B29C44/00; B29C44/34; B29C44/58; B29C44/588; B29C33/00; B29C33/10; Y; Y10; Y10S; Y10S425/00; Y10S425/812
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
157 words
A gas venting device for a foam mold defining therein a mold cavity and having an upper mold half formed with at least one vent hole therein, comprising: a valve for closing and opening said at least one vent hole of said foam mold; a valve driving cylinder for driving said at least one valve for closing and opening said at least one vent hole; a main change-over valve for controlling the valve driving cylinder; pressure accumulating means connected through the main change-over valve to the valve driving cylinder; change-over means connected to the main change-over valve for changing-over said main change-over valve by external inputs; timer means for actuating the main change-over valve with a variable delay time; and said gas venting device together with said foam mold being mounted on a trolley, said trolley movable through an oven, whereby said gas venting device is actuated as said trolley is moved by activating said change-over valve.
Claim 2
Dependent Claim
157 words
A gas venting device for a foam mold defining therein a mold cavity and having an upper mold half formed with at least one vent hole therein, comprising: a valve for closing and opening said at least one vent hole of said foam mold; a valve driving cylinder for driving said at least one valve for closing and opening said at least one vent hole; a main change-over valve for controlling the valve driving cylinder; pressure accumulating means connected through the main change-over valve to the valve driving cylinder; change-over means connected to the main change-over valve for changing-over said main change-over valve by external inputs; timer means for actuating the main change-over valve with a variable delay time; and said gas venting device together with said foam mold being mounted on a trolley, said trolley movable through an oven, whereby said gas venting device is actuated as said trolley is moved by activating said change-over valve.
Claim 3
Dependent Claim
49 words
A gas venting device as set forth in claim 1, wherein said main change-over valve is a pilot operated change-over valve, and the change-over means is a mechanical change-over valve connected to the pressure accumulating means for supplying pilot pressure into and exhausting from the pilot operated change-over valve.
Claim 4
Dependent Claim
27 words
A gas venting device as set forth in claim 1, wherein said pressure accumulating means comprises a cartridge type pressurized air tank attached to said foam mold.
Claim 5
Dependent Claim
31 words
A gas venting device as set forth in claim 1, wherein, said timer means comprises an air timer which is arranged between said valve driving cylinder and said main change-over valve.
Claim 6
Dependent Claim
51 words
A gas venting device as set forth in claim 4, wherein said air timer comprises a variable throttle, an accumulator and a change-over valve which are connected in series with each other, said change-over valve of the air timer being interposed between said valve driving cylinder and said main change-over valve.
References Cited (Backward Citations)
US2591839A
Cited
US2825306A
Cited
US3156255A
Cited
US3960059A
Cited
US4526085A
Cited
US4065094A
Cited
US4113415A
Cited
US4143851A
Cited
US4161135A
Cited
US4372193A
Cited
US4479914A
Cited
US4621496A
Cited
JPS60257211A
Cited
US4637587A
Cited
JPS61158412A
Cited
JPS62154908A
Cited
US4935191A
Cited
US4782886A
Cited
US4779667A
Cited
US4923666A
Cited
US4923666B1
Cited
US4787436A
Cited
US4923667A
Cited
JPH03109017A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-05-05 | 1995-11-04 | 1996-05-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-05-05 | 1999-11-04 | 2000-05-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-05-05 | 2003-11-04 | 2004-05-05 | $7700.00 | Window Closed / Lapsed |