# US 5,349,507 A · Flashlight with pressure relief valve

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- Number: US 5,349,507 A
- Document ID: US5349507A
- Status: Granted
- Kind: A
- Application number: 08/164,556
- Filed: 1993-12-10
- Granted: 1994-09-20
- Earliest claimed: 1993-12-10
- Inventors: David H. Parker
- Web page: https://patentgrep.com/patent/US5349507A

## CPC

- F21V 31/00: Gas-tight or water-tight arrangements
- F21L 2/00: Systems of electric lighting devices (systems employing both electric and non-electric light sources or exchangeable light sources F21L27/00)
- F21V: FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21L: LIGHTING DEVICES OR SYSTEMS THEREOF, BEING PORTABLE OR SPECIALLY ADAPTED FOR TRANSPORTATION

## Abstract

Including of a pressure relief valve assembly in conjunction with the body of a watertight/airtight flashlight. The pressure relief valve is to function to dissipate a pressurized hydrogen gas within the body of the flashlight and expel such into the ambient. The hydrogen gas is created by normal operation of the flashlight.

## Claims

### Claim 1

In combination with the flashlight formed of a body having an enclosed internal compartment, said compartment being substantially airtight and watertight, said compartment adapted to contain at least one battery, said compartment having an access opening, a reflector housing mounted within said access opening, a light bulb mounted within said reflector housing, a lens cover enclosing said reflector housing and sealing in a fluid-tight manner with said body, the improvement comprising:
a pressure relief opening formed within said body, a pressure relief valve assembly mounted on said body in conjunction with said pressure relief opening, said pressure relief valve assembly to expel into the ambient pressurized gas accumulated within said internal compartment;
said pressure relief valve assembly being normally closed, said pressure relief valve assembly opens automatically upon sufficient gas pressure being accumulated within said internal compartment; and
said pressure relief valve assembly including a spring, said spring pressing against a sealing disc, said spring normally locating said sealing disc in the closed position closing said pressure relief opening, said sealing disc having a peripheral edge, said peripheral edge including at least one groove, whereby upon sufficient gas pressure being created within said internal compartment said sealing disc is unseated from its said seated position with gas being permitted to flow through said groove into the ambient.

### Claim 2 (depends on 1)

The combination as defined in claim 1 wherein: said spring means comprising a coil spring.