Patent US3756321A successfully refreshed from Google Patents.
US3756321A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flush type sprinkler
Assignee: GRUNAU SPRINKLER MANUFACTURING COMPANY Inc A WIS CORP
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Filing: 1972-04-05
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Granted: 1973-09-04
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Expires: 1992-04-05
Abstract
Abstract A sprinkler is provided mounted flush in a ceiling and has an overlapping outer escutcheon plate releasably held in place by resilient upwardly extending members connected to the escutcheon plate by heat responsive elements. The escutcheon plate is normally secured in covering relation to the sprinkler which has a strut containing a heat responsive element with a different selected heat release temperature. Heat sensing fins in contact with the escutcheon plate are movable downwardly below the ceiling line to an exposed position upon release of the plate and thereby increase the sensitivity of the strut heat responsive element. Provisions are made for positioning of the sprinkler in the ceiling to insure proper liquid discharge and to protect the structure against ceiling tiles disrupting the distribution.
Inventors
- 👤 F Gloeckler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 06:20
CPC Classifications
A; A62; A62C; A62C37/00; A62C37/08; A62C37/09
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
143 words
A sprinkler for mounting in a ceiling comprising a body with a frame normally disposed above the lower face of the ceiling, said body having a fluid supply connection and a discharge bore, a valve plug normally closing said bore, a cross head member vertically slidably mounted with respect to said body and including a deflector plate for diverting water discharged from said discharge bore, means engaged with said member for retaining said valve plug in closed position including transversely collapsible first temperature sensitive means carried by said frame, cover means disposed on the lower face of the ceiling in covering relation to said frame, temperature sensitive releasable means for holding said cover means in position and including members normally urging said cover in an upward direction, and a member for positioning said sprinkler with respect to said lower face of said ceiling.
Claim 2
Dependent Claim
143 words
A sprinkler for mounting in a ceiling comprising a body with a frame normally disposed above the lower face of the ceiling, said body having a fluid supply connection and a discharge bore, a valve plug normally closing said bore, a cross head member vertically slidably mounted with respect to said body and including a deflector plate for diverting water discharged from said discharge bore, means engaged with said member for retaining said valve plug in closed position including transversely collapsible first temperature sensitive means carried by said frame, cover means disposed on the lower face of the ceiling in covering relation to said frame, temperature sensitive releasable means for holding said cover means in position and including members normally urging said cover in an upward direction, and a member for positioning said sprinkler with respect to said lower face of said ceiling.
Claim 3
Dependent Claim
24 words
A sprinkler as defined in claim 1 in which said last mentioned member is carried at a fixed position with respect to said body.
Claim 4
Dependent Claim
38 words
A sprinkler as defined in claim 1 in which said last mentioned member comprises a plate portion with downwardly extending portions and outwardly extending feet for location in a predetermined Relation to the lower face of the ceiling.
Claim 5
Dependent Claim
20 words
A sprinkler as defined in claim 3 in which said feet are engageable with the lower face of the ceiling.
Claim 6
Dependent Claim
19 words
A sprinkler as defined in claim 3 in which said cover means is in concealing relation to said feet.
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) | 1976-09-03 | 1977-03-05 | 1977-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-03 | 1981-03-05 | 1981-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-03 | 1985-03-05 | 1985-09-04 | $7700.00 | Window Closed / Lapsed |