# US 4,397,224 A · Sheet metal attachment system and method for installation of mine brattices

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- Number: US 4,397,224 A
- Document ID: US4397224A
- Status: Granted
- Kind: A
- Application number: 06/234,865
- Filed: 1981-02-13
- Granted: 1983-08-09
- Earliest claimed: 1981-02-13
- Assignees: Hilliard-Lyons Patent Management, Inc.
- Inventors: Kenneth G. Walker
- Web page: https://patentgrep.com/patent/US4397224A

## CPC

- E21F 17/103: Dams, e.g. for ventilation
- Y10T 29/49833: Punching, piercing or reaming part by surface of second part
- Y10T 29/49948: Multipart cooperating fastener [e.g., bolt and nut]
- Y10T 403/7123: Traversed by connector
- E21F: SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A sheet metal attachment system and method for the installation of underground mine brattices of the type in which a gas impervious barrier of malleable sheet metal is retained on a peripheral framework of slotted beams. The fastening system involves pre-mounting a plurality of bolts projecting from one face of the framework as piercing pins so that the sheet metal may be initially applied by forcing it over the pins. The pierced sheet metal is then drawn against the framework by a multi-apertured washer plate and barrier mounting nut threaded onto the bolts.

## Claims

### Claim 1

In the installation of a mine brattice having a gas impervious barrier of malleable sheet metal adapted to be deformed into sealing contact about the peripheral inner surfaces of a mine tunnel, and means to support said barrier including a peripheral framework of slotted beams, a method of securing said sheet metal barrier to said framework of slotted beams comprising the steps of:
premounting a plurality of threaded bolts to said slotted beams by drawing bolt mounting nuts along the length of the bolts and against said slotted beams so that the threaded shanks of the bolts project from one side of the framework;
placing the sheet metal adjacent the side of the framework of slotted beams from which the threaded shanks of the bolts project;
forcing the sheet metal over the projecting bolt shanks causing the sheet metal to be pierced by each bolt shank;
placing an apertured washer plate over the bolt shanks projecting through the pierced sheet; and,
threading a barrier retaining nut on each of the bolt shanks projecting through said washer plates thereby drawing said washer plate against the sheet and the slotted beams forcing the sheet against the bolt mounting nuts causing the sheet to be deformed by the bolt mounting nuts into the washer plate apertures and seized between said bolt mounting nuts and the periphery of the washer plate apertures.