| | Impulse sprinkler deflector spoon - Patent 4330087 |
 | | The water stream drives the deflector portion against the force of a biasing spring away from the water stream for impact with a portion of the sprinkler to partially rotate the sprinkler, whereupon the spring urges the deflector spoon back into engagement with the water stream for subsequent and successive reaction therewith. |
 | | The side and front walls of the spoon deflector portion are configured to form a relatively sharply curved, or deep-dished, upper deflector face extending over approximately the upper third of the deflector portion, and a correspondingly relatively sharply curved or deep-dished lower deflector face extending over approximately the lower third of the deflector portion. |
 | | These upper and lower deflector faces 52 and 54, respectively, occupy approximately one-third each of the vertical dimension of the deflector portion 46, and function to impact with the water stream to extract a relatively large magnitude of driving energy from the water stream by virtue of the relatively sharp change in stream direction. |
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