Topic
Paddle
About: Paddle is a research topic. Over the lifetime, 5649 publications have been published within this topic receiving 28389 citations.
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Patent•
14 Dec 2001
TL;DR: In this paper, an ergonomic weight support device for a seat has a flexible pressure plate attached to an extending paddle for lumbar support, which can be retracted to be flat, or from which the paddle can be extended to provide lumbal support.
Abstract: An ergonomic weight support device for a seat has a flexible pressure plate attached to an extending paddle for lumbar support. The paddle extends from a housing having a channel into which the paddle may be retracted for the lumbar support to be flat, or from which the paddle may be extended for lumbar support. The flexible pressure plate distributes lumbar supporting pressure across a greater area for comfort.
25 citations
TL;DR: In this article, a planing and skipping of a rectangular paddle on the surface of a shallow stream was studied, and it was concluded that the rise of water ahead of the paddle, in particular the way this varies over time, is responsible for causing the planing state to become unstable.
Abstract: Experiments are conducted to study the planing and skipping of a rectangular paddle on the surface of a shallow stream. The paddle is allowed to move freely up and down by attaching it to a pivoted arm. A steady planing state, in which the lift force from the water balances the weight on the paddle, is found to be stable for small stream velocities but to become unstable above a certain threshold velocity which depends upon the weight and the angle of attack. Above this threshold, the paddle oscillates in the water and can take off into a continual bouncing, or skipping, motion, with a well-defined amplitude and frequency. The transition is sometimes bistable so that both a steady planing state and a regular skipping state are possible for the same experimental parameters. Shallow-water theory is used to construct simple models that explain the qualitative features of the planing and skipping states in the experiments. It is found that a simple parameterisation of the lift force on the paddle proportional to the depth of entry is not sufficient to explain the observations, and it is concluded that the rise of water ahead of the paddle, in particular the way this varies over time, is responsible for causing the planing state to become unstable and for enabling a continual skipping state.
24 citations
Patent•
20 Dec 2001
TL;DR: In this article, a unitized back plate and lumbar support device for a seat including a back plate, a housing with a channel, which housing was fixedly attached to the back plate.
Abstract: A unitized back plate and lumbar support device for a seat including a back plate, a housing with a channel, which housing is fixedly attached to the back plate, and an extending paddle. The extending paddle has a free end with a pressure surface, the surface being a load bearing element proximal to a seat occupant, and the extending paddle has an encapsulated end in extendible communication with the channel in the housing. An actuator mediates travel of the extending paddle between a substantially retracted position and an extended position.
24 citations
TL;DR: Four paddle designs for a two‐compartment forced feeder were evaluated for their die‐filling performance in function of varying tableting speeds, eventually resulting in the selection of a feed frame design that is most robust and therefore will provide a uniform die-filling over a wide range of throughputs.
24 citations