Abstract: A cushioning mechanism suitable for use with an office chair is disclosed. A seat frame is connected pivotally to the front of a support frame for swinging motion about the pivotal connection. The swinging motion of the seat frame is converted into the translation thereof by means of a link mechanism, and thus a cushioning member such as a coil spring incorporated in the support frame is compressed by the translation of the seat frame. Accordingly, even when the seat portion is made to swing by a large degree, the front of the seat portion is not greatly shifted in height, thereby enabling the user to sit in the chair comfortably.

Abstract: A composite metal/concrete floor system and method of installation. The system includes a novel decking profile; snap-in cover plates to provide longitudinal cells for three services; a lateral trench with sheet metal rails and bottom plates; and cooperating preset inserts. The deck and cover plate may be used as distribution cells suspended between the bar joists of a formed deck.

Abstract: A method and apparatus for measuring the voltage standing wave ratio on a radio frequency transmission line. The bandwidth of radio frequency signals over which the apparatus accurately operates is improved by the use of a filter to unload terminating resistors at low frequencies and by the use of an inductive element in the measuring circuit to compensate for phase lag induced by elements of the measuring circuit.

Abstract: A composite metal/concrete floor system and method of installation. The system includes a novel decking profile; snap-in cover plates to provide longitudinal cells for three services; a lateral trench with sheet metal rails and bottom plates; and cooperating preset inserts.

Abstract: A method and apparatus for managing an electronic radio telephone lock in which the electronic lock can be rendered operative or inoperative only by first entering a predetermined code so as to prevent unauthorized use as well as accidental or unauthorized locking, code changes, etc.

Abstract: A compressed single side band communication system and method in which the audio signal is compressed prior to pre-emphasis and thereafter summed with a pilot tone for further compression prior to transmission. Initially, only the pilot tone is transmitted at full rated power to aid in acquisition of the signal by the receiver. Thereafter, the transmitter ALC is disabled and the pilot tone is attenuated. The receiver adjusts the frequency characteristics of the pilot tone filter and phase lock loop filter in the detector as a function of lock-on. The delay after loss of lock-on in reverting to wide band pilot tone and wideband loop filters is varied as a function of signal strength. The pilot tone may be frequency modulated for tone coded squelch, with the modulating source being located in the return end of the phase lock loop filter. A unique filter is provided to insure acquisition of the pilot tone.

Abstract: A pneumatically operated reciprocating three-way valve having particular application to a double diaphragm pump. The valve is operative without a lubricating oil mist or the inefficiency resulting from air leakage between the valve piston and cylinder. Sticking and stalling of the valve piston are prevented by deformation of the cylinder under pressure to provide leakage of selected cavities within the valve. The pump also avoids the use of a deicer mist by an adjustable bleed of high pressure air to provide a two-step exhaust.

Abstract: In a method of opto-electronic inspection of a two-dimensional pattern on an object, especially a printed board, a micro-inspection is carried out by subjecting line-by-line scanned picture elements in pixel-by-pixel fashion to a sequence of picture operations for inspection of dimensions and spacings, and the respective result is compared with the corresponding scanned pixel. At the same time a macro-inspection is carried out by combining the scanned pixels to frames and by respective reduction thereof to a single characteristic picture information, whereupon a comparison is again performed, but this time with the corresponding picture information of a reference picture. In this way it is possible to perform a quick and fully automatic real-time inspection of two-dimensional patterns, for instance printed boards, both for minute and hardly visible defects and for macro-defects.

Abstract: A main beam for a ceiling grid suspension system with an improved connector and compression section. The connector is of the tongue and strap type, compact with improved resistance to bending. The compression section includes an interrupted and compressed bead, a creased web strap and a downward deflecting flange.

Abstract: A mobile telephone and method of dialing in which telephone numbers are stored in immediately adjacent memory locations and in which dialing is automatically and timely accomplished in a plurality of signalling formats.

Abstract: A grate bar has an elongated top wall, two longitudinally extending sidewalls, transversely extending front and rear walls, a bottom wall, and several longitudinally extending ribs at the underside of the top wall. The walls define an air heating chamber which receives fresh air from a first opening below the rar wall and discharges heated air by way of a second opening which is provided in one of the sidewalls close to the front wall. The ribs divide the chamber into several elongated channels and a compartment which is located immediately behind the front wall and communicates with the channels as well as with the second opening. At least one of the ribs which are nearest to the one sidewall is spaced apart from the bottom wall so that the channels which flank such rib can communicate with one another along the upper side of the bottom wall.

Abstract: A method and apparatus for providing aerated water to a tank used for the rearing of aquatic animals. Positioning of the intake posts and exit drains to establish one or more vollutes of water which substantially fill the tank provides a self-cleaning tank with reduced areas of inhabitability. The method and apparatus permits tanks to be lengthened without a need to add turbulence to the water. An improved method and apparatus for oxygenating water while maintaining nitrogen concentrations within acceptable limits is disclosed as well as a system for energy efficiently maintaining the temperature of the water in the tank.

Abstract: The pump, specifically, barrel pump, can be equipped with exchangeable impellers (8, 8'), which can be screwed onto the lower end of the drive shaft (9). One impeller (8) is designed as an axial impeller, while the other impeller (8') is designed as a radial impeller. The radial impeller needs as intake orifice (37), which is easily exchangeable inside the pump foot. So that both impellers can be installed into otherwise identical pumps, it is necessary to select a larger distance between the impeller and the guide wheel in the case of the radial impeller than in the case of the axial impeller and to furnish the guide wheel with commensurately longer guide blades, which have, at the connection with the forward curved section, a long straight area parallel to the axis. Furthermore, the transportation channel inside the guide wheel is narrowed at the beginning and widens in the course of the axial flowthrough.

Abstract: The disclosed apparatus is an electro-optical fingerprint copier.The apparatus uses a camera with one or more lenses to copy the impression made by the ridges on the tips of fingers and thumbs. These impressions are useful as a means for identification since no two persons have the same pattern of ridges.The apparatus also includes an automatic chart feeder, positioning and releaser, an automatic shutter control and lense system to position fingers. The features make possible the processing of an accurate fingerprint chart in a very short time.

Abstract: A novel vertical ball-check valve for a sanitary diaphragm pump with a unitary housing and valve seat, an elastomeric ball, preferably hollow to respond to low pump pressure, and a removable ball stop to permit removal of the ball for inspection and cleaning of the valve housing. The ball, passageway, and ball stop are sized relative to each other to provide space for solids which have passed through the valve seat to be discharged from the outlet end without stalling the valve. A method for total visual inspection of the ball-check valve without removing the check from the system is also disclosed.

Abstract: A gutter assembly with a leaf guard and soffit strip for attachment along a roof edge. Mounting brackets are provided for installing the assembly to rafters having variations in spacing, length, height, and parallelism, and for supporting one side of a soffit strip. The gutter, including its leaf guard and connectors, is integrally constructed as is both the soffit strip and its accompanying wall connector. The soffit strip is shaped to allow slidable insertion into and removal from the assembly. The leaf guard has numerous elongated aperatures with rearward facing depressions. Assemblies having combinations of these features are also disclosed as are methods of installation, the assemblies being adapted both for new construction with or without fascia and for replacing existing gutters.

Abstract: A wheel load indicator comprises a rectangular flat plate (1) of a light material having measuring properties. A series of recesses (4) forming webs (5) are provided along two lateral edges (6) of the plate (1). Strain gauges (12) are adhesively bonded to walls of bores (10) in the area of the webs (5) to determine the shearing stress under the load of a wheel (100) which has driven on the bending portion (3).

Abstract: Apparatus used for dimensional inspection of a pipe spool, and further for marking or cutting and finishing of the both ends by means of laying at least an end tangent horizontal and having each center of the cutting end section in a line which is parallel to a base frame.