Marine propulsion – Oar or paddle – Articulated sectional oar or paddle
Patent
1999-02-01
2000-07-04
Sotelo, Jesus D.
Marine propulsion
Oar or paddle
Articulated sectional oar or paddle
B63H 1604
Patent
active
060830662
ABSTRACT:
A rowing apparatus which allows an oarsman to face forward while propelling a watercraft such as a canoe (20) forward when pulling on handles (32). The articulated apparatus includes two sheaves coupled by a pair of criss-crossing, adjustable cables enclosed within a housing (24). A detachable, obtuse-angle shaped handle (32) attaches to a handle lever (34), which attaches to an upper side of one of the sheaves. An under side of the other sheave attaches to an oar blade lever (38), which extends to an oar blade (40). Each sheave has an axle (120) supported at its extremities by housing (24) and a canopy (26). A canopy cover (28) encloses each canopy (26), fastens to each axle (120), and rotates with its respective lever (34) or (38). A pair of outriggers (30A) and (30B) pivotally support housing (24) at an outboard location and attach to a pair of thwarts (46) and (48). A pair of webbing straps (50) form an "X" brace between thwarts (46) and (48). Mounting pads (54), which attach with an adhesive to the upper surface of gunwales (22), accept anti-slip pins (56) projecting from the bottom side of thwarts (46) and (48). Counterbalance springs (182A) and (182B) compensate for imbalance of the design and overhang of blade (40). The arrangement of springs (182A) and (182B) provide a reduction of lifting pressure to blade (40) when in a submerged position. An oar blade float (42) attaches to an upper portion of blade (40), preventing it from dropping excessively below the water surface. Float (42) has a hinged attachment allowing it to drop to a lower position for reducing aerodynamic drag during the recovery stroke. A variation of an oar blade (shown in FIGS. 15a to 15d) includes a spring-loaded pivotal blade with a float which automatically feathers when removed from water. This variation includes a float with a surface for hydroplaning during the recovery stroke. Serving as a bumper, a triangular flaglike structure herein described as a pennant bumper (44), attaches to housing (24) and gunwale (22) forward of housing (24).
REFERENCES:
patent: 284984 (1883-09-01), Schunk
patent: 535584 (1895-03-01), Harbers
patent: 718156 (1903-01-01), Putman
patent: 788884 (1905-05-01), Buff
patent: 808720 (1906-01-01), Buff
patent: 1345860 (1920-07-01), Kohl
patent: 2033637 (1936-03-01), Kaiser
patent: 3857356 (1974-12-01), Jewett
patent: 5037339 (1991-08-01), Smith
Canoe & Kayak Magazine, Mar. 1997, p. 35 (canoe rowing attachment).
Paddler Magazine, Jul./Aug. 1998, p. 74 (raft oars).
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