Patent US4388942A successfully refreshed from Google Patents.
US4388942A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Nozzle flapper valve
Assignee: Tokyo Keiki Inc
•
Filing: 1981-01-16
•
Granted: 1983-06-21
•
Expires: 2001-01-16
Abstract
Abstract A nozzle flapper valve provided with a nozzle, fixed throttle and flapper, characterized in that the flapper is formed to be cylindrical and has the cylindrical peripheral surface positioned on the axis of the nozzle so as to simplify the flapper moving mechanism and to prevent the flapper clearance from being clogged with dust in the fluid.
Inventors
- 👤 Akio Mito
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:28
CPC Classifications
F; F15; F15C; F15C3/00; F15C3/10; F15C3/14; Y; Y10; Y10T; Y10T137/00; Y10T137/2278; Y10T137/2409
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
149 words
A nozzle flapper valve comprising: a cylindrical flapper (41) having a geometric center and a substantially cylindrical peripheral surface; a first rotary shaft (44) connected to said flapper at a location eccentric to said geometric center for movement of said flapper; rotating means connected to said first shaft for rotating said first shaft within a selected range; a lever (43) connected to said first shaft, said flapper rotatably mounted to said lever about a second shaft, (42) connected to said lever; a nozzle (22) having an axis intersecting said peripheral surface and spaced from said peripheral surface by a selected clearance (ΔX); and said shaft being positioned and said selected range being chosen so that said geometric center of said flapper is eccentric with said axis of said nozzle by a distance (ΔY) and said clearance (ΔX) is established between said nozzle and said peripheral surface of said flapper.
Claim 2
Dependent Claim
149 words
A nozzle flapper valve comprising: a cylindrical flapper (41) having a geometric center and a substantially cylindrical peripheral surface; a first rotary shaft (44) connected to said flapper at a location eccentric to said geometric center for movement of said flapper; rotating means connected to said first shaft for rotating said first shaft within a selected range; a lever (43) connected to said first shaft, said flapper rotatably mounted to said lever about a second shaft, (42) connected to said lever; a nozzle (22) having an axis intersecting said peripheral surface and spaced from said peripheral surface by a selected clearance (ΔX); and said shaft being positioned and said selected range being chosen so that said geometric center of said flapper is eccentric with said axis of said nozzle by a distance (ΔY) and said clearance (ΔX) is established between said nozzle and said peripheral surface of said flapper.
Claim 3
Dependent Claim
32 words
A nozzle flapper valve according to claim 1, wherein said nozzle opens in a plane, including a pad set associated with said nozzle and projecting beyond said plane toward said cylindrical flapper.
Claim 4
Dependent Claim
33 words
A nozzle flapper valve according to claim 1, wherein said rotating means comprises a stepping motor connected to said first rotary shaft for rotating said first rotary shaft and adjusting the selected clearance.
Claim 5
Dependent Claim
34 words
A nozzle flapper valve according to claim 3, including a spring connected to said flapper for biasing said flapper into a position to maintain a selected clearance when said stepping motor is not energized.
Claim 6
Dependent Claim
30 words
A nozzle flapper valve according to claim 1, wherein said cylindrical peripheral surface has at least portions which depart from a right cylinder to form an irregular peripheral flapper surface.
Claim 7
Dependent Claim
36 words
A nozzle flapper valve according to claim 1, wherein, said cylindrical flapper is rotatably mounted to one end of said lever about said geometric center, an opposite end of said lever connected to said rotary shaft.
Claim 8
Dependent Claim
34 words
A nozzle flapper valve according to claim 1, wherein said cylindrical flapper is rotatably mounted to one end of said lever and on said second shaft at a location eccentric to said geometric center.
Claim 9
Dependent Claim
22 words
A nozzle flapper valve according to claim 2, wherein said pad set entirely surrounds a periphery of said nozzle in said plane.
Claim 10
Dependent Claim
18 words
A nozzle flapper valve according to claim 2, wherein said pad set extends parallel to the nozzle axis.
Claim 11
Dependent Claim
154 words
A nozzle flapper valve according to claim 1, including: a main body (11) defining a bore (12); a piston (13) having said nozzle at an end thereof and movable in said bore; said main body defining a drain chamber (15) with a drain hole (15a) communicating therewith, said nozzle and said flapper disposed in said drain chamber; said bore having a length parallel to said nozzle axis which is longer than said piston along said nozzle axis; said nozzle forming a large area surface on one end of said piston, said piston connected to a piston rod at an opposite end from said nozzle, said piston rod forming a small area surface on an opposite end of said piston; said nozzle flapper valve including fluid communication means in communication with said large and small area surfaces of said piston having a fixed throttle (19) in a passage communicating said large and small area surfaces.
Claim 12
Dependent Claim
94 words
A nozzle flapper valve according to claim 10 including a supporting frame (26) secured to an outside of said main body (11), a stepping motor connected to said rotary shaft; a third shaft (27a) connected to said first shaft (44), a joint (25) connected to said third shaft, a stop pin (28) connected to said joint, a projection (26a) in said supporting frame (26) and a spring (31) connected between said projection and said stopping pin for moving said flapper into an original position after movement of said flapper out of its original position.
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) | 1986-06-20 | 1986-12-20 | 1987-06-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-06-20 | 1990-12-20 | 1991-06-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-06-20 | 1994-12-20 | 1995-06-21 | $7700.00 | Window Closed / Lapsed |