CA1213789A - Paddle with buoyancy - Google Patents
Paddle with buoyancyInfo
- Publication number
- CA1213789A CA1213789A CA000482398A CA482398A CA1213789A CA 1213789 A CA1213789 A CA 1213789A CA 000482398 A CA000482398 A CA 000482398A CA 482398 A CA482398 A CA 482398A CA 1213789 A CA1213789 A CA 1213789A
- Authority
- CA
- Canada
- Prior art keywords
- paddle
- buoyancy
- tubular
- compartments
- kayak
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63H—MARINE PROPULSION OR STEERING
- B63H16/00—Marine propulsion by muscle power
- B63H16/04—Oars; Sculls; Paddles; Poles
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- Ocean & Marine Engineering (AREA)
- Other Liquid Machine Or Engine Such As Wave Power Use (AREA)
Abstract
ABSTRACT
In a paddle for propelling kayak or small boat, it is known to have two buoyancy compartments, one at each end of the paddle, a tubular-shaped section connected to the outward end of each buoyancy compartment, and a common shaft connected to the inward ends of the two buoyancy compartments to form a double-ended paddle. This newly invented paddle is held with two hands in the same manner as the conventional paddle.
But the propulsion is produced by the horizontal resultant force of the buoyancy force and the water resistance when the paddle is pushed toward the back of the kayak.
In a paddle for propelling kayak or small boat, it is known to have two buoyancy compartments, one at each end of the paddle, a tubular-shaped section connected to the outward end of each buoyancy compartment, and a common shaft connected to the inward ends of the two buoyancy compartments to form a double-ended paddle. This newly invented paddle is held with two hands in the same manner as the conventional paddle.
But the propulsion is produced by the horizontal resultant force of the buoyancy force and the water resistance when the paddle is pushed toward the back of the kayak.
Description
~Z~37~9 SPECIFICATION
~ his invention relates to water sport apparatus and more particularly to a paddle for propelling kayak or small boat to move on water.
It is common to see a kaya~ capsize and roll in waterO
It is difficult for a kayaker to keep balance and steady on water because of the narrow shape of the kayak. ~he conventional double-ended flat blade paddle is inefficient when the blade is not perpendicular to the direction of stroke, or when the paddle is moved away from the vertical 10 positionO ~herefore, it is only used for short strokes.
It is an object of the present invention to provide a paddle with buoyancy -that can be used to propel a kayak more efficiently and in the same time keep balance and steady.
Another object of the present invention is to provide a 15 paddle with buoyancy that can be used as a life buoy in emergency.
Still a further object of the present invention is to provide a double-ended paddle with buoyancy that can be taken apart at the coupling and used as single-ended paddles.
Still addi-tional objects7 benefits, and advantages of this invention will become evident from a study of the following detailed description taken in conjunction with the accompanying drawing, in which:
~igure 1 is the general view of a double-ended paddle made ~5 in accordance with the present invention. The upper hal~ of ~igure 1 shows the exterior view and the lower half the interior view.
Figure 2 is an end view 1-1 of the said paddle shown in Figure 1.
~igure 3 is a cross sectional view taken along line 2-2 of Figure 1.
Referring now specifically to the drawing, a paddle with buoyancy made in accordance with the present invention is shown to include two water tight buoyancy compartments 1 35 having streamline paraboloidal exterior shape. The extension of the wall of the buoyancy compartment 1 beyond a closure plate 3 forms a tubular-shaped section 2. A series of vent holes 4 are located near the base of the tubular-shaped section. A shaft 5 connects the two buoyancy compartments 1 371~
to form a double~ended paddle. A coupling 6 is provided along shaft 5 and thus it can be ~aken apart to form two single-ended paddles.
The operation of this newly invented paddle with buoyancy ~ill now be readily understood. When the paddle is pushed backward into water in the power stroke, the tubular-shaped section 2 cuts into water immediately as air e~its through the vent holes 4 and thus, the paddle receives the ma~imum ~ater resistance on its projected area~ and in the same time 10 the buoyancy compartment 1 is kept submerged to produce the ma~imum buoyancy force. It is the resultant force of these two forces that propels the kayak forward. In return stroke7 when the paddle is pulled forward the buoyancy force raises the paddle out of water as air fills in the tubular~shaped 15 section 2 from the open end and vent holes 4 while the water exits.
~ he double-ended paddle can be taken apart at the coupling 6 and used as single-ended paddles The efficiency of a paddle depends on the projected area 20 and stroke length. The projected area of the newly invented paddle with buoyancy is constant and the stroke length can be as long as the arm can reach. ~lso, because of the shape of the inven-tive design the new paddle can be pushed into water in any direction to produce effective reaction.
25 ~herefore, this newly invented paddle with buoyancy is more efficient and easy to use than the conventional flat blade paddle. Also, during the power stroke the newly invented paddle with buoyancy supports its own dead weight and thus conserves the muscle energy of the operator.
It is thought from the foregoing description that the advantages and novel features of this invention will be readily apparent.
While this invention has been described with particular reference to the construction shown in the drawing and while 35 various changes may be made in the detail construction and in the combination and arrangement of several parts, it shall ~e understood that such changes fall within the spirit and scope of the present invention as defined by the appended claims.
~ his invention relates to water sport apparatus and more particularly to a paddle for propelling kayak or small boat to move on water.
It is common to see a kaya~ capsize and roll in waterO
It is difficult for a kayaker to keep balance and steady on water because of the narrow shape of the kayak. ~he conventional double-ended flat blade paddle is inefficient when the blade is not perpendicular to the direction of stroke, or when the paddle is moved away from the vertical 10 positionO ~herefore, it is only used for short strokes.
It is an object of the present invention to provide a paddle with buoyancy -that can be used to propel a kayak more efficiently and in the same time keep balance and steady.
Another object of the present invention is to provide a 15 paddle with buoyancy that can be used as a life buoy in emergency.
Still a further object of the present invention is to provide a double-ended paddle with buoyancy that can be taken apart at the coupling and used as single-ended paddles.
Still addi-tional objects7 benefits, and advantages of this invention will become evident from a study of the following detailed description taken in conjunction with the accompanying drawing, in which:
~igure 1 is the general view of a double-ended paddle made ~5 in accordance with the present invention. The upper hal~ of ~igure 1 shows the exterior view and the lower half the interior view.
Figure 2 is an end view 1-1 of the said paddle shown in Figure 1.
~igure 3 is a cross sectional view taken along line 2-2 of Figure 1.
Referring now specifically to the drawing, a paddle with buoyancy made in accordance with the present invention is shown to include two water tight buoyancy compartments 1 35 having streamline paraboloidal exterior shape. The extension of the wall of the buoyancy compartment 1 beyond a closure plate 3 forms a tubular-shaped section 2. A series of vent holes 4 are located near the base of the tubular-shaped section. A shaft 5 connects the two buoyancy compartments 1 371~
to form a double~ended paddle. A coupling 6 is provided along shaft 5 and thus it can be ~aken apart to form two single-ended paddles.
The operation of this newly invented paddle with buoyancy ~ill now be readily understood. When the paddle is pushed backward into water in the power stroke, the tubular-shaped section 2 cuts into water immediately as air e~its through the vent holes 4 and thus, the paddle receives the ma~imum ~ater resistance on its projected area~ and in the same time 10 the buoyancy compartment 1 is kept submerged to produce the ma~imum buoyancy force. It is the resultant force of these two forces that propels the kayak forward. In return stroke7 when the paddle is pulled forward the buoyancy force raises the paddle out of water as air fills in the tubular~shaped 15 section 2 from the open end and vent holes 4 while the water exits.
~ he double-ended paddle can be taken apart at the coupling 6 and used as single-ended paddles The efficiency of a paddle depends on the projected area 20 and stroke length. The projected area of the newly invented paddle with buoyancy is constant and the stroke length can be as long as the arm can reach. ~lso, because of the shape of the inven-tive design the new paddle can be pushed into water in any direction to produce effective reaction.
25 ~herefore, this newly invented paddle with buoyancy is more efficient and easy to use than the conventional flat blade paddle. Also, during the power stroke the newly invented paddle with buoyancy supports its own dead weight and thus conserves the muscle energy of the operator.
It is thought from the foregoing description that the advantages and novel features of this invention will be readily apparent.
While this invention has been described with particular reference to the construction shown in the drawing and while 35 various changes may be made in the detail construction and in the combination and arrangement of several parts, it shall ~e understood that such changes fall within the spirit and scope of the present invention as defined by the appended claims.
Claims (3)
1. A paddle with buoyancy comprising, in combination, two buoyancy compartments, a shaft with a coupling connecting the said buoyancy compartments, a tubular-shaped section with a series of vent holes connected to the outwart end of each buoyancy compartment.
2. A paddle with buoyancy as defined in claim 1, in which the buoyancy compartment is a water tight streamline shell with the larger end extended beyond a closure plate to form a tubular-shaped section, and with the smaller end connected to a common shaft.
3. A paddle with buoyancy as defined in claim 1 in which the shaft can be taken apart at the coupling.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CA000482398A CA1213789A (en) | 1985-05-27 | 1985-05-27 | Paddle with buoyancy |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CA000482398A CA1213789A (en) | 1985-05-27 | 1985-05-27 | Paddle with buoyancy |
Publications (1)
Publication Number | Publication Date |
---|---|
CA1213789A true CA1213789A (en) | 1986-11-12 |
Family
ID=4130554
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CA000482398A Expired CA1213789A (en) | 1985-05-27 | 1985-05-27 | Paddle with buoyancy |
Country Status (1)
Country | Link |
---|---|
CA (1) | CA1213789A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1998046482A1 (en) * | 1997-04-14 | 1998-10-22 | Chi Keung Leung | Improved fluid displacing blade |
CN104159817A (en) * | 2012-02-17 | 2014-11-19 | 戴卡特隆有限公司 | Multipurpose paddle |
-
1985
- 1985-05-27 CA CA000482398A patent/CA1213789A/en not_active Expired
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1998046482A1 (en) * | 1997-04-14 | 1998-10-22 | Chi Keung Leung | Improved fluid displacing blade |
US6354804B1 (en) | 1997-04-14 | 2002-03-12 | Chi Keung Leung | Fluid displacing blade |
EA002323B1 (en) * | 1997-04-14 | 2002-04-25 | Вортекс Резёрч Энд Девелопмент Корпорэйшен, Лимитед | Improved fluid displacing blade and rotodynamic machine |
CN104159817A (en) * | 2012-02-17 | 2014-11-19 | 戴卡特隆有限公司 | Multipurpose paddle |
CN104159817B (en) * | 2012-02-17 | 2016-08-24 | 戴卡特隆有限公司 | Multipurpose quant |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
MKEX | Expiry |