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Enclosed pop-up sprinklers with shielded impact arms

  • US 6,478,237 B2
  • Filed: 01/23/2001
  • Issued: 11/12/2002
  • Est. Priority Date: 08/02/1998
  • Status: Expired due to Fees
First Claim
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1. An enclosed pop-up sprinkler unit with delayed activation comprising:

  • an outer case formed with a fluid inlet that is in fluid communication with an interior region of the outer case;

    a rotatable closed-case turret assembly formed with a fluid outlet in communication with a central shaft having a lower end shaft portion extending into the interior region of the outer case, wherein the turret assembly includes a hinged impact arm formed with a serpentine path that redirects water flow ejected from the fluid outlet therethrough;

    an extendable riser sleeve supporting the rotatable turret assembly that is slidably positioned within at least a portion of the interior region of the outer case, wherein the riser sleeve includes a filter with at least one spring seat, and a filter valve seat formed along a top portion of the filter that may selectively disengage from the lower end shaft portion of the central shaft to permit the flow of fluid from the interior region of the case into the central shaft; and

    a delayed riser spring assembly having a primary riser spring positioned between the spring seat and the upper end portion of the outer case and a secondary riser spring positioned between the spring seat and a lower end portion of the riser sleeve, wherein the primary riser spring compresses when a fluid enters the interior region of the outer casing to move the riser sleeve in relatively upward direction, and wherein the secondary riser spring is pre-compressed with an initial compressive force that is overcome upon compression of the first riser spring to disengage the filter valve seat from the lower end shaft portion of the central shaft to permit the flow of fluid from within the interior region of the outer casing out through the fluid outlet.

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