Patent US4978205A successfully refreshed from Google Patents.
US4099573A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sprinkler head
Assignee: Hitachi Ltd
•
Filing: 1976-12-20
•
Granted: 1978-07-11
•
Expires: 1996-12-20
Abstract
Abstract An improved sprinkler head for use in fire retarding systems including means for confirming the presence of water pressure at the sprinkler head. The confirming means includes a valve means provided in the sprinkler head and coupled to the water input of the sprinkler head and a pressure detection port provided in the sprinkler head coupled to the water input of the sprinkler head via the valve means whereby a pressure gauge may be connected to the port and the valve means opened so that the water pressure may be determined.
Inventors
- 👤 Tamotsu Sahara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 01:33
CPC Classifications
A; A62; A62C; A62C37/00; A62C37/50
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
177 words
A device for confirming water pressure in sprinkler heads of the type including two forking arms connected to a head pipe near the area of junction with a water delivery pipe at one end and coupled at the other end to a part that supports a heat-sensing component, comprising: a branch passageway connected with said head pipe of said sprinkler head which sprinkles water during a fire due to the activation of said heat-sensing component, said branch passageway being drilled through at least one of the two forking arms such that it communicates with said part that supports said heat-sensing component; a valve means which opens and closes the branch passageway by contact with, and separation from, said passageway; a restraining part which holds said valve in said passageway such that said valve is removed from the branch passageway when said restraint is loosened; and a pressure detection port provided in said restraining part and connected with said branch passageway when the branch passageway is opened by said valve, and to which pressure gauge may be connected.
Claim 2
Independent Claim
177 words
A device for confirming water pressure in sprinkler heads of the type including two forking arms connected to a head pipe near the area of junction with a water delivery pipe at one end and coupled at the other end to a part that supports a heat-sensing component, comprising: a branch passageway connected with said head pipe of said sprinkler head which sprinkles water during a fire due to the activation of said heat-sensing component, said branch passageway being drilled through at least one of the two forking arms such that it communicates with said part that supports said heat-sensing component; a valve means which opens and closes the branch passageway by contact with, and separation from, said passageway; a restraining part which holds said valve in said passageway such that said valve is removed from the branch passageway when said restraint is loosened; and a pressure detection port provided in said restraining part and connected with said branch passageway when the branch passageway is opened by said valve, and to which pressure gauge may be connected.
Claim 3
Dependent Claim
45 words
A device for confirming water pressure in sprinkler heads according to claim 1 wherein that portion of said branch passageway which comes into contact with said valve is tapered, and said valve is tapered such that said valve fits said taper of said branch passageway.
Claim 4
Dependent Claim
39 words
A device for confirming water pressure in sprinkler heads according to claim 1 wherein said restraining part is screw-connected to said sprinkler head, and said valve is pushed into the branch passageway by the tightening of said restraining part.
Claim 5
Dependent Claim
37 words
A device for confirming water pressure in sprinkler heads according to claim 1 further comprising a bolt screwed into the pressure detection port whereby said pressure detection port can be opened by removing said bolt whenever necessary.
Claim 6
Dependent Claim
25 words
A device for confirming water pressure in sprinkler heads according to claim 4 further comprising a purge vent drilled through the axis of said bolt.
Claim 7
Dependent Claim
53 words
A device for confirming water pressure in sprinkler heads according to claim 5 further comprising a bolt screwed into said purge vent whereby said branch passageway is connected with the atmosphere via said purge vent by removing said bolt from said purge vent when said valve has been removed from said branch passageway.
Claim 8
Dependent Claim
65 words
A device for confirming water pressure in sprinkler heads according to claim 1 wherein that portion of said branch passageway which comes into contact with said valve is tapered, said valve is tapered so that it fits said taper, and said restraining part is screw-connected to the sprinkler head whereby said valve is pushed into the branch passageway by the tightening of this screw connection.
Claim 9
Dependent Claim
64 words
A device for confirming water pressure in sprinkler heads according to claim 7 wherein said restraining part is in the form of a cap nut containing a hollow space which has female threads provided on an inside rim, said valve is installed upright in the center of said hollow space, and said pressure detection port is provided through a portion of the cap nut.
Claim 10
Dependent Claim
37 words
A device for confirming water pressure in sprinkler heads according to claim 8 further comprising a bolt screwed into the pressure detection port whereby said pressure detection port can be opened by removing said bolt whenever necessary.
Claim 11
Dependent Claim
25 words
A device for confirming water pressure in sprinkler heads according to claim 9 further comprising a purge vent drilled through the axis of said bolt.
Claim 12
Dependent Claim
53 words
A device for confirming water pressure in sprinkler heads according to claim 10 further comprising a bolt screwed into said purge vent whereby said branch passageway is connected with the atmosphere via the purge vent by removing said bolt from the purge vent when said valve has been removed from said branch passageway.
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) | 1981-07-10 | 1982-01-09 | 1982-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-07-10 | 1986-01-09 | 1986-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-07-10 | 1990-01-09 | 1990-07-11 | $7700.00 | Window Closed / Lapsed |