Safety grating for riser of a septic tank
AssigneeInfiltrator Water Technologies, LLC
InventorsGregory Trude, Paul R Holbrook
Life of this patent
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Abstract
A safety grating has an arch shape cross section and is useful within a riser having a frusto-conical shape wall which riser is attached to a septic tank or another structure. The grating comprises a hub and radially extending arms, one or more of which is rotatable relative to the hub length at a hinge joint, to decrease the size of the grating and enable installation of the grating by passing the grating a smaller end opening of a riser.
Claims17
A grating having a central lengthwise axis and an arch shape cross section in a plane within which said axis lies, for use within an upward-extending circular riser, comprising:
- a hub having a length lying along said central lengthwise axis;
- a multiplicity of arms, each arm having
- a length,
- a first end attached to the hub, and
- a second end that is a free end;
- wherein each arm extends radially outward from the hub;
- and,
- wherein at least one arm is in whole or part hinged for pivoting in a plane within which lies said central lengthwise axis.
Dependencies are inferred from the claim text.