# US 9,435,435 B2 · Universal secondary safety system including a riser and screen

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- Number: US 9,435,435 B2
- Document ID: US9435435B2
- Status: Granted
- Kind: B2
- Application number: 14/532,441
- Filed: 2014-11-04
- Published: 2016-05-05
- Granted: 2016-09-06
- Earliest claimed: 2014-11-04
- Assignees: Polylok Corporation
- Applicants: Polylok, Inc.
- Inventors: Peter W. Gavin
- Web page: https://patentgrep.com/patent/US9435435B2

## CPC

- F16J 13/065: {the clamp comprising a ring encircling the flange}
- A62B 35/00: Safety belts or body harnesses; Similar equipment for limiting displacement of the human body, especially in case of sudden changes of motion (buckles A44B11/00; accessories for children's furniture A47D15/00; children's seats B60N2/24; safety belts or body harnesses for land vehicles B60R22/00; harnesses for parachutes B64D17/30; harnessing in aircraft B64D25/06; releasable fastenings F16B)
- E03F 5/00: Sewerage structures
- E03F 5/02: Manhole shafts or other inspection chambers (in general E02D29/12); Snow-filling openings; accessories (covers or frames for manholes or the like E02D29/14)
- E06B 2009/002: {Safety guards or gates}
- E06B 2009/015: {Mounting details}
- F16J: PISTONS {(specially adapted for dampers F16F9/32)}; CYLINDERS; SEALINGS
- A62B: DEVICES, APPARATUS OR METHODS FOR LIFE-SAVING (valves specially adapted for medical use A61M39/00; life-saving devices, apparatus or methods specially adapted for use in water B63C9/00; divers' equipment B63C11/00; specially adopted for use with aircraft, e.g. parachutes, ejector seats, {B64D17/00, B64D25/10}; rescue devices peculiar to mining E21F11/00)
- E03F: SEWERS; CESSPOOLS
- E06B: FIXED OR MOVABLE CLOSURES FOR OPENINGS IN BUILDINGS, VEHICLES, FENCES OR LIKE ENCLOSURES IN GENERAL, e.g. DOORS, WINDOWS, BLINDS, GATES (shades or blinds for greenhouses A01G9/22; curtains A47H; lids for car boots or bonnets B62D25/10; skylights E04B7/18; sunshades, awnings E04F10/00)

## Abstract

Systems for providing universally installable secondary safety systems for use, in one embodiment, with a riser for a septic tank are disclosed. In some embodiments, the system includes the following: a riser extending from a system of interest located underground, a retainer ring installed within said riser, and a safety screen to prevent access to the underground system and lower portions of the riser from above.

## Claims

### Claim 1

A septic tank riser safety system for preventing accidental entry to a riser joined with and extending away from a septic tank, comprising:
an expandable retainer ring including top and exterior side surfaces and first and second ends, said exterior side surface joined with interior walls of said riser;
a safety screen positioned on and joined with said top surface of said expandable retainer ring wherein said safety screen includes one or more holes sized to receive fasteners for fastening said safety screen to said top surface, said safety screen having an upper surface that is generally convex;
an adjustable ratchet mechanism included on said expandable retainer ring for increasing and decreasing a diameter of said expandable retainer ring and releasably joining said first and second ends; and
wherein said exterior side surface of said expandable retainer ring includes one or more pre-drilled holes sized to receive fasteners for fastening said expandable retainer ring to interior walls of a riser; and
wherein said adjustable ratchet mechanism allows the diameter of the retainer ring to increase by about at least about 1% to about 10%.