Abstract: A delay circuit comprising a plurality of cascaded saturating circuit elements is provided. The delay circuit may be incorporated in such circuits as modulators and demodulators to provide signal delay.

Abstract: A delay circuit comprising a plurality of cascaded saturating circuit elements is provided. The delay circuit may be incorporated in such circuits as modulators and demodulators to provide signal delay.

Abstract: A delay circuit for providing signal delay within an acoustic imaging system is provided. Reflected acoustic signals are transformed into electrical signals and are used to reproduce images of objects. Delay lines along the electrical signal path are used to focus the images compensating for asynchronism of electrical signals caused by variations in the length of acoustic signal paths.

Abstract: A push frame assembly for a scraper bowl is provided with a tubular structural member extending between, and being rigidly fastened directly to, the side walls of the push frame. A push block and a spreader tube are, likewise, connected between the side walls to produce a relatively rigid frame assembly. In one form of the invention, the tubular structural member has a transverse sleeve therethrough through which an ejector cylinder passes, while in another form of the invention, the tubular structural member has provision for receiving a differential and has reinforced mounts on the one side thereof for connection of ejector cylinders thereto. A method of making a push frame assembly is provided wherein a pair of side walls are fastened directly to a tubular member with a spreader tube and a push block framework connected to the side walls to produce a stronger push frame assembly.

Abstract: A push frame assembly for a scraper bowl is provided with a tubular structural member extending between, and being rigidly fastened directly to, the side walls of the push frame. A push block and a spreader tube are, likewise, connected between the side walls to produce a relatively rigid frame assembly. In one form of the invention, the tubular structural member has a transverse sleeve therethrough through which an ejector cylinder passes, while in another form of the invention, the tubular structural member has provision for receiving a differential and has reinforced mounts on the one side thereof for connection of ejector cylinders thereto. A method of making a push frame assembly is provided wherein a pair of side walls are fastened directly to a tubular member with a spreader tube and a push block framework connected to the side walls to produce a stronger push frame assembly.

Abstract: A scraper comprises a bowl structure having an ejector assembly reciprocally mounted thereon for selectively discharging material forwardly of the bowl structure. In one embodiment of this invention, a guide rail assembly is secured interiorly on each sidewall of the bowl structure to engage a guide roller, rotatably mounted on the ejector, for guiding the same during its movements in the bowl. Each guide rail assembly comprises a cylindrical guide rod secured on a respective sidewall by a pair of locating rods disposed on either side of the guide rod and welded between the guide rod and the sidewall. The guide rod is secured to the sidewall of the bowl structure by placing a first linear portion thereof adjacent to the sidewall and then placing first linear portions of the locating rods on either side of the guide rod to space it from the sidewall at a first predetermined distance.