US3733783A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrostatic precipitator
Assignee: YORK-LUXAIRE Inc A CORP OF DE
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Filing: 1971-10-29
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Granted: 1973-05-22
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Expires: 1991-10-29
Abstract
Abstract A door latch and safety arrangement for an electrostatic precipitator is comprised of a spring contact to engage at least one of the plates of one polarity to thereby connect those plates to a first grounded terminal of a high voltage power supply when the door is in place and the latch is in the locked position. A test button is arranged so that when it is momentarily depressed and while the latch is locked, the spring contact is also moved towards the plates that are connected to the second terminal of the power supply and charged with the other polarity to thus produce an audible spark indicating the charged condition of the plates. When the latch is moved to the unlocked position, switch means connected therewith de-energizes the power supply. Moving the latch to the unlocked position also moves the spring means to simultaneously connect together precipitator plates of opposite charges and thus short circuit the collector cell and eliminate any residual charge therein.
Inventors
- 👤 I Burney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 00:55
CPC Classifications
B; B03; B03C; B03C3/00; B03C3/34; B03C3/72
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
171 words
A door latch and safety arrangement for an electrostatic precipitator cabinet enclosing a stack of precipitator plates alternate ones of which are oppositely charged, said arrangement coMprising, a door panel, a latching door handle mounted on said door and movable from a latching to a non-latching position, a power supply for charging said plates, means to connect said door panel to one terminal of said power supply when said door is in the latching position on said cabinet, spring contact means on said door adapted to contact at least one of said plates that is to be charged with the same polarity as the one terminal of said supply when said door is secured to the cabinet in the latching position, and means to move said spring contact means also into contact with at least one of the plates to be charged with the other polarity when said handle is moved out of the latching position while said door is still in place on the cabinet and in its latching position.
Claim 2
Dependent Claim
171 words
A door latch and safety arrangement for an electrostatic precipitator cabinet enclosing a stack of precipitator plates alternate ones of which are oppositely charged, said arrangement coMprising, a door panel, a latching door handle mounted on said door and movable from a latching to a non-latching position, a power supply for charging said plates, means to connect said door panel to one terminal of said power supply when said door is in the latching position on said cabinet, spring contact means on said door adapted to contact at least one of said plates that is to be charged with the same polarity as the one terminal of said supply when said door is secured to the cabinet in the latching position, and means to move said spring contact means also into contact with at least one of the plates to be charged with the other polarity when said handle is moved out of the latching position while said door is still in place on the cabinet and in its latching position.
Claim 3
Dependent Claim
100 words
The invention of claim 1, wherein said spring contact means on said door is adapted to contact at least one terminal of said power supply when the door is secured to the cabinet in a latching position, and additional means being also provided to be operable to move said spring contact means toward at least one of the plates to be charged with the other polarity while said door and door handle are still in place on the cabinet and in the latching position, said additional means, when operated, providing an audible indication that said precipitator plates are electrically charged.
Claim 4
Dependent Claim
60 words
The invention of claim 2, wherein the additional means to move said spring contact means toward at least one of the plates that is to be charged with the other polarity is a push button which engages said spring to move the spring toward said plates as the push button is depressed to thus cause an audible spark to occur.
Claim 5
Dependent Claim
30 words
The invention of claim 1, wherein switch means are provided for de-energizing said power supply when said door handle is first moved from the latching position towards the non-latching position.
Claim 6
Dependent Claim
30 words
The invention of claim 2 wherein switch means are provided for de-energizing said power supply when said door handle is first moved from the latching position towards the non-latching position.
Claim 7
Dependent Claim
30 words
The invention of claim 2 wherein switch means are provided for de-energizing said power supply when said door handle is first moved from the latching position towards the non-latching position.
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) | 1976-05-21 | 1976-11-20 | 1977-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-21 | 1980-11-20 | 1981-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-21 | 1984-11-20 | 1985-05-22 | $7700.00 | Window Closed / Lapsed |