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1948-49 Theatre Catalog, 7th Edition, Page 419 (406)

1948-49 Theatre Catalog, 7th Edition
1948-49 Theatre Catalog
1948-49 Theatre Catalog, 7th Edition, Page 419
Page 419

1948-49 Theatre Catalog, 7th Edition, Page 419


a cooling system as well as a lubricating system carries away any heat that may be generated in any part of the projector mechanism. .

Brenkertfs positive method of continuous automatic lubrication provides each projector with the right kind of lubrication, at the right time and in the right place. This means longer lasting highquality performance, longer wearing of all parts, low maintenance cost. All rotating shafts are carefully designed so that oil cannot get into the mm compartment or soundhead. THE OIL IS KEPT IN, AND DIRT IS KEPT OUT. Thus, with the film kept clean and free from oil, the projected picture is clearer and the sound is free from distortion.

This method of lubrication is far superior to the more conventional hand oiled or pressure systems, where oil is forced into a hole and distributed over the surface of the bearing by a groove in the shaft. This groove conventionally does not extend the entire length of the bearing, since the oil would soon flow out the openend of the groove and the bearing would tend to run dry. Consequently, the ends of the bearing do not receive sufficient lubrication and, therefore, begin to wear. After wearing, oil leaks from the ends of the bearings into the film compartment. Consequently, manual oiling has the two disadvantages of greater wear in the bearings which soon results in more oil in the film coinpartment.

lniermiHeni and Gear Train

A second important point is the rugged heavy duty construction of the intermittent mechanism and the gear train. From earlier photographs you have had an opportunity to see how very substantial and durable is the complete gear train of any Brenkert projector.

In the Brenkert 60 projector all gears are of large diameter with a %" wide

gear face; the gear teeth are cut on an angle that will produce a minimum lateral thrust, reducing wear. Large diameter gears result in greater radial accuracy and, therefore, smoother and quieter operation. The wide gear face provides a greater contact area between meshing teeth, which results in a longer life for the gears. Steel gears are mated with phenolic gears wherever necessary to increase the life and reduce noise to a very low level. Large diameter, highgrade steel shafts and long bearings are used throughout, to maintain the original accuracy of gear alignment. The design features insure long life at low maintenance cost.

Figure 4 shows the standard Brenkert intermittent mechanism which is identically the same in both models of Brenkert projectors. High-quality bronze


bushings manufactured with absolute precision are used for both the intermittent star wheel and cam shafts. Bronze bushings can be manufactured much more accurately and will last at least four times longer than a cast iron bearing of the same length and bore. The design of the Brenkert 60 projector mechanism lends itself to the use of bronze bearings in the intermittent unit, because of the abundance of oil flowing continuously over all its parts, thoroughly lubricating them and maintaining them at a low temperature. Without this type of lubrication, bronze bushings are not practical in an intermittent because the heat generated and held by the oil confined in the intermittent case would result in excessive expansion of the bronze bushings, which in turn would result in rapid wear and bind-ups.


1948-49 Theatre Catalog, 7th Edition, Page 419