US3677216A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rowing device
Assignee: Individual
•
Filing: 1970-07-29
•
Granted: 1972-07-18
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Expires: 1990-07-29
Abstract
Abstract An oar is provided with a pivotal paddle blade for selffeathering action on the return stroke without lifting the paddle blade out of the water. When two such cars are used in conventional oarlocks, the boat is rowed by merely moving the oar handles horizontally back and forth without the customary lowering of the handles on the return strokes. A boat may be propelled by a single on of such oars having a ball on the shaft of the oar to support the oar for pivotal movement in a vertical plane. The oar may thus be mounted on a transom bracket or on a pedestal housing in the bottom of the boat. By rotating the oar about its own axis to different positions, simple back and forth oscillation of the oar in different vertical planes will propel the boat backward, forward, sideways or in a turning movement, as desired.
Inventors
- 👤 Arthur J Gentemann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 13:12
CPC Classifications
B; B63; B63H; B63H16/00; B63H16/04
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
128 words
An oar comprising a shaft, said shaft comprising a pair of telescoping tubes and means securing said tubes together selectively in extended and retracted positions, a selffeathering paddle blade mounted for swinging movement on a transverse pivot pin in one end of said shaft, a coil spring on said pin arranged to urge said paddle blade into a position approximately parallel with said shaft, a handgrip on the opposite end of said shaft having finger grooves on one side and a smooth palm rest on its opposite side whereby the handgrip is directional for determining the orientation of said paddle blade, and a bearing element on an intermediate portion of said shaft supporting said shaft for rotation of the shaft on its axIs by rotation of said handgrip.
Claim 2
Dependent Claim
128 words
An oar comprising a shaft, said shaft comprising a pair of telescoping tubes and means securing said tubes together selectively in extended and retracted positions, a selffeathering paddle blade mounted for swinging movement on a transverse pivot pin in one end of said shaft, a coil spring on said pin arranged to urge said paddle blade into a position approximately parallel with said shaft, a handgrip on the opposite end of said shaft having finger grooves on one side and a smooth palm rest on its opposite side whereby the handgrip is directional for determining the orientation of said paddle blade, and a bearing element on an intermediate portion of said shaft supporting said shaft for rotation of the shaft on its axIs by rotation of said handgrip.
Claim 3
Dependent Claim
16 words
An oar as defined in claim 1, said bearing element being adapted to fit an oarlock.
Claim 4
Dependent Claim
15 words
An oar as defined in claim 1, said bearing element having a spherical bearing surface.
Claim 5
Dependent Claim
38 words
An oar as defined in claim 3 including a supporting fulcrum having a spherical bearing surface arranged to engage said bearing element and support said oar for rotative movements and back and forth movements in a vertical plane.
Claim 6
Dependent Claim
18 words
An oar as defined in claim 4, said supporting fulcrum being mounted in outboard position on a boat.
Claim 7
Dependent Claim
39 words
An oar as defined in claim 4, said supporting fulcrum being mounted on a pedestal housing on the bottom of a boat and said oar extending through an opening in the bottom of the boat enclosed by said housing.
Claim 8
Dependent Claim
24 words
An oar as defined in claim 4, said supporting fulcrum comprising a horizontal plate having a slot for insertion and removal of the oar.
Claim 9
Dependent Claim
27 words
An oar as defined in claim 4, said bearing element on said shaft comprising a ball and said supporting fulcrum comprising a spherical socket containing said ball.
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) | 1975-07-18 | 1976-01-17 | 1976-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-18 | 1980-01-17 | 1980-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-18 | 1984-01-17 | 1984-07-18 | $7700.00 | Window Closed / Lapsed |