Paddle

About: Paddle is a research topic. Over the lifetime, 5649 publications have been published within this topic receiving 28389 citations.

Hog scraper paddle

Abstract: Disclosed is a hog scraper paddle for dehairing and polishing hog carcasses and the like, including a resiliently flexible paddle body having a substantially rectangular block shape, said body being made of an easy-to-clean, substantially non-porous thermoplastic material having a softening temperature endotherm peak greater than about 350° F. and a flexular modulus value between about 100 and 150,000 psi preferably either between about 100 and 6,000 or between about 30,000 and 150,000 psi. The paddle body may include a mounting means and openings therein for receiving the mounting means. At least one scraper blade may be attached to the paddle body for dehairing or polishing a carcass. Also disclosed is a method for making a hog scraper paddle of thermoplastic material by injection molding, compression molding, or blow molding. Post manufacturing treatments, such as annealing and heating are also disclosed.

HVAC assembly including temperature mixing valve

Abstract: A HVAC assembly includes a temperature mixing valve that comprises a shaft, an upper paddle, a lower paddle, and a yielding means. The upper paddle and the lower paddle attach to the shaft. The yielding means applies a force to keep the upper paddle sealed to prevent cold air in a cold air inlet from entering a mixing zone and the lower paddle moves away from a shared sealing boundary over a predetermined angle of rotation before the upper paddle initially moves to allow cold air to enter the mixing zone. Movement of the lower paddle away from the shared sealing boundary allows cold air to enter a hot air inlet and admix with hot air to mix in the mixing zone to produce non-stratified air.

Gutter cleaner tool

Abstract: A device is described for cleaning leaves and other debris from common house gutters, consisting of a pole handle, to each end of which is attached a simple tool consisting of two arms mounted at right angles to the handle and 180 degrees apart. On the end of each arm is a paddle shaped roughly like the bottom of the gutter. About six inches from the pole, one of the arms is offset some three inches toward the operator. The paddle attached to this arm is smaller in height than that attached to the other. In operation, the paddle on the straight arm pulls the leaves down the gutter until it reaches a cross-strut. The operator then rotates the handle 180 degrees permitting the offset arm and the smaller paddle to pull the leaves under the cross-strut. The operator then rotates the handle back to its original position so that it can insert the paddle of the straight arm into the gutter on the near side of the cross-strut but behind the pile of leaves, and repeats the procedure until all the debris has been brought to the operator and lifted from the gutter.

Animated game bird decoy

Abstract: The animated game bird decoy simulates wing movements of various species and creates the illusion of living waterfowl on water by disturbing the surface of the water. A wing/paddle constructed from a planar flexible material is mounted to a flexible stem situated beneath a stationary hollow decoy. An operating cord manipulated by a hunter is attached to the steam Alternately applying and releasing tension on the line causes movement of the flexible stem that imparts motion to the wing/paddle device. The oscillating movement of the wing/paddle device produces the illusion of a duck with beating wings on the surface of the water. The unit can be used in the absence of water, the hunter relying on the stationary decoy and the movement of the wings to attract waterfowl. The unit does not rely on motors or air movement, and activates only when the hunter applies and releases tension on the cord.

Mechanical Agitation and Alum Floc Formation

Abstract: Our forefathers gave to the water works profession a very useful and economical chemical in alum, which has proved to be indispensable in preparing water for the rapid sand filters. The importance of mixing the water after the application of alum to produce the most effective flocculating action is well recognized. During the past years, various methods of agitation have been used, namely, baffles, hydraulic jump, flocculator and mechanical agitator. For efficient control of the mixing basins, a standard method of laboratory tests with results than can be applied to plant operations, would be of great assistance to the water works engineer. During the past five years, the writer has been making both theoretical and practical studies on the mechanical agitation phase of alum treatment. Mechanical agitation used for alum floe formation with Lake Michigan water at Winnetka, 111., was started on June 19, 1928. The original water filtration plant of 3.0 m.g.d. capacity, had one mechanical agitation basin with 10 minutes nominal detention period. The mixer assembly consisted of a three H.P. varying speed, brush shifting single phase motor, a vertical drive speed reducer and a vertical drive paddle shaft with two paddles of 8.40 square feet total surface area or 350 cubic feet basin capacity per square foot of paddle surface area. The velocities at the outer ends of the paddles were variable, 2.4 maximum and 0.95 feet per second minimum, with power consumption of 18 at maximum speed and 12 kilowatt-hours per 24 hours at minimum speed. The plant extension, put into operation on February 14, 1932, has six mechanical agitation basins with a total combined detention period of 30 minutes at plant capacity of 6.0 m.g.d. The mixer assembly consists of a two H.P. 5-speed 3-phase motor, a horizontal drive speed reducer, one set of bevel gears and a vertical drive paddle shaft. At the time these basins were put into operation, each of the six agitators had one paddle with a total square foot surface area of