CA1213789A

CA1213789A - Paddle with buoyancy

Info

Publication number: CA1213789A
Application number: CA000482398A
Authority: CA
Inventors: Ea-Lu Ting
Original assignee: TING EA LU
Current assignee: TING EA LU
Priority date: 1985-05-27
Filing date: 1985-05-27
Publication date: 1986-11-12

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.

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.

Claims

The embodiments of the invention in which an exclusive property or privilege is claimed are defined as follows:

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.