Abstract: A locking mechanism for a door, such as the door of a transformer enclosure, includes a rotatable threaded locking member secured to the door. The locking member is spring biased outwardly, and stationary engagement structure is provided for engaging the threaded locking member when the door attains a predetermined position as the door approaches its closed position. The engagement structure includes a pair of spaced apart engagement members, which are preferably threaded so as to engage the threads of the threaded member as the door is moved toward its closed position. The threaded locking member can than be pushed inwardly, and the engagement members are biased to provide a ratcheting mechanism to prevent the threaded locking member from being withdrawn from between the engagement members.

Abstract: An exhaust hood includes a collection chamber with a converging inlet passageway which directs the rising fume laden air downwardly toward a reverse turning area from which a baffled cleansing chamber extends upwardly. The collection chamber has a large top air capture pocket above the inlet passageway. The cleansing chamber includes alternating baffles on the opposite walls and generally a V-shaped in cross section with a smooth apex. The baffles define a generally serpentine for a mechanical cleansing path. The air cleansing nozzles permit periodic washing of the cleansing chamber surfaces. A common wall between the inlet passageway and cleansing chamber is pivotally mounted for access to the chamber. A water bath may form the bottom wall of the turning area. The stream angularly engages the bath with bath effective agitation, atomization and turbulence for mixing and removal of foreign matter from the air which then turns and moves through the cleansing chamber.

Abstract: A self-contained induction air supply unit is provided for an exhaust hood having an exhaust fan drawing of freeze laden air through an angled filter. The supply unit includes a supply chamber with a bottom stream forming slot having a curved bottom wall for turning air through the slot and into the exhaust hood. An air deflector includes an adjustable support coupled to the curved bottom wall to vary the angular orientation of the stream to permit changing the angle of the induction air stream for proper engagement with the filter and simultaneously change the curved bottom wall. The deflector in one form includes a single plate having a curved portion abutting the underside of the curved bottom wall and an outer planar portion. In another structure the curved bottom slot wall is flexibly mounted. A deflector plate is pivotally mounted beneath the outer end of flexibly mounted wall and projects outwardly thereof.

Abstract: A guide for flexible power lines connecting a power supply to a moving device includes a plurality of similar rectangular tubular duct elements mounted with adjacent elements telescoped into each other and pivotally connected to form a beam support in the linear direction and a curved support between the beam supports. Each element is a cast element of a suitable metal or other material having relatively heavy walls. The side walls include offset planar wall interconnected by transverse interior stop walls which are angularly oriented and shaped. The stop walls and the outer side wall end edges of the adjacent element are similarly shaped with first and second opposed wall portions. The first wall portion of the side walls abutt in the beam position and the second wall portions are spaced by the maximum pivotal movement.