Illinois Tool Works Inc.

David C Boyer

William E Ruehl

Frank V Pliml, Jr

John A Bakker

John N Schavilje

Arthur J Danko

A differential pressure signal device employing an audible vibratory reed assembly having the property of being activated automatically upon being subjected to a predetermined energy level. The assembly is preferably all plastic and includes a unique rockable flapper valve that is automatically activated when the differential in pressure between two chambers reaches a predetermined level. The opening of said valve provides a large inrush of air that activates and operates the audible vibration of said reed until the differential in pressure is lowered below said predetermined level.

Differential pressure signal device

Screw anchor

Electric light socket

This invention relates to a two piece plastic idler pulley formed of identical portions including a hub, a web and a rim with identical fastening means on the two half portions which permit the two portions to be joined together as the idler pulley. The hub of the idler pulley has a through bore which is inversely tapered whereby the hub will flex when subjected to a workload and will capture the lubricant internally of the bore. The rim carries diverging means which extend radially and laterally outwardly from the rim to insure proper seating of power transmission means such as a belt. The diverging means also is capable of engaging the power transmission belt when it is inadvertently seated on the hub to move the belt into seated relationship on the rim for proper operation of the device.

Idler pulley

A plastic buckle adapted to adjustably secure extremities of a web-like material including a frame-like body portion, fastening means at one end of said body portion for fixedly securing the buckle to one extremity of said web-like material and means for adjusting the opposite extremity of said web-like material including at least two transverse parallel bars positioned adjacent the opposite end of said body portion. Said adjusting means including two transverse parallel bars providing edges spaced from one another on opposite sides of a plane a distance not greater than the predetermined thickness of the web and lying in spaced planes perpendicular to said first mentioned plane.

Buckle

Growing community of inventors

Chicago, IL, United States of America

David C Boyer