Patent US3822966A successfully refreshed from Google Patents.
US3822966A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic pump
Assignee: Owatonna Tool Co
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Filing: 1972-10-26
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Granted: 1974-07-09
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Expires: 1992-10-26
Abstract
Abstract A hydraulic hand pump having an integral reservoir associated with a body having a handle assembly for operating the piston member of the pump. The pump has relief valve structure mounted in the body and communicating with the reservoir with use of a part of the same flow path for supplying fluid to the pump piston and with a passage mounting both an intake valve and an outlet check valve. An outlet sure port and a release valve associated therewith has a return passage leading to reservoir.
Inventors
- 👤 Clocklin S Mc
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 14:28
CPC Classifications
B; B66; B66F; B66F3/00; B66F3/24; B66F3/25; B66F3/42
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
154 words
A hydraulic pump comprising, a pump body with an outwardly extending part, a reservoir tube assembly fitted onto said part, means defining a bore in said body and a movable piston therein for pumping hydraulic fluid in response to reciprocation of the piston, a pair of passages communicating with said bore and with a chamber in said body part open to the reservoir, said pair of passages being generally parallel and opening to an end of said chamber, an intake valve in one of said passages, a relief valve in the other passage, said relief valve including a spring and an adjustable seating member for said spring in said chamber, openings in said seating member permitting flow therethrough between the reservoir and said pair of passages, a filter screen spanning said seating member, means for holding the filter screen in position adjacent said seating member, a pump pressure port, and an outlet check valve.
Claim 2
Dependent Claim
154 words
A hydraulic pump comprising, a pump body with an outwardly extending part, a reservoir tube assembly fitted onto said part, means defining a bore in said body and a movable piston therein for pumping hydraulic fluid in response to reciprocation of the piston, a pair of passages communicating with said bore and with a chamber in said body part open to the reservoir, said pair of passages being generally parallel and opening to an end of said chamber, an intake valve in one of said passages, a relief valve in the other passage, said relief valve including a spring and an adjustable seating member for said spring in said chamber, openings in said seating member permitting flow therethrough between the reservoir and said pair of passages, a filter screen spanning said seating member, means for holding the filter screen in position adjacent said seating member, a pump pressure port, and an outlet check valve.
Claim 3
Dependent Claim
80 words
A hydraulic pump as defined in claim 1 wherein said one passage extends through said body with a pair of steps providing valve seats, said outlet check valve having a ball engaging one of said seats, said intake valve being formed of hexagonal stock with a recess therein, a first spring in said recess of the intake valve and engaging the ball to urge the intake valve to closed position and a second spring urging the ball against its seat.
Claim 4
Dependent Claim
77 words
A hydraulic pump as defined in claim 1, a release valve chamber in the body, a straight-line outlet passage connectiNg said pressure port, said one passage terminating in a seat for said release valve chamber, a release valve in the release valve chamber in communication with said pressure port, and a return passage in said body extending along a straight line from said release valve chamber through said outwardly extending body part to communicate with the reservoir.
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) | 1977-07-08 | 1978-01-07 | 1978-07-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-08 | 1982-01-07 | 1982-07-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-08 | 1986-01-07 | 1986-07-09 | $7700.00 | Window Closed / Lapsed |