Abstract: An air flow reversal prevention door is mounted to a discharge opening of a ventilation fan. The door includes a frame member with a void in it to permit air flow to pass through the frame and is attached fixedly to a shaft which supports the door and is located between the door and a discharge opening of the ventilation fan. While the door is held open by air from the ventilation fan, the frame member is moved from the edge of the discharge opening toward the door and back and this enables the shaft to rotate because it is fixedly attached to the frame member and it causes the shaft to rotate with movement of the frame member. This causes the shaft to rotate through the entire range of motion of the door between its open position and its collapsed position. This tests the operation of the door without turning off the fan. Whenever the fan fails or is turned off the air flow ceases and the door collapses by gravity toward the discharge opening to prevent air reversal flow.

Abstract: An ornament for displaying a standard 35 mm slide mount including removable planar frame member to hold the transparency, a body member with integral device for attaching the ornament to a decorative string of lights, a reflector within the body member for reflecting light toward the 35 mm slide to be viewed, and a diffuser within the body member to diffuse the light directed toward the 35 mm slide to be viewed. The removable planar frame may be rectangular in shape to simulate a picture frame.

Abstract: A fluid connector assembly having a flexible austenitic annealed stainless steel 300 series corrugated convoluted tube. At least one end of the tube has a smooth end which is free of convoluted corrugations. The corrugated portion has a hardness range of 150 to 190 points Vickers and the smooth end of the tube has a range of hardness of 275 to 380 points Vickers. A metal compression nut is used in combination with a metal compression ring in a metal fitting the smooth end to couple. The metal fitting is capable of coupling the fluid connector to another connector.

Abstract: A resistor grid assembly has a continuous resistor weave with a plurality of generally parallel, plate-like electrical elements. U-shaped bends join two adjacent elements at adjacent ends. The U-shaped bends are located in a bottom group and a top group. There is a top electrical insulating member adjacent the U-shaped bends in the top group and spaced from the U-shaped bends. There is a bottom electrical insulating member adjacent the U-shaped bends in the bottom group. Stop U-shaped pins having a pair of legs with a pair of shoulders are supported by the bottom electrical insulating member. The legs of each stop U-shaped pin extends into a pair of holes in the bottom group of U-shaped pins and rest upon the shoulders which are spaced from the insulator. Wire U-shaped pins are supported by the top electrical insulating member. The wire U-shaped pins have legs inserted into holes in the U-shaped bends in the top group. The U-shaped bends in the top group are spaced from the top insulator.

Abstract: A connector assembly for delivering natural gas or propane from a fixed pipe having a shut-off valve to a moveable gas cooking appliance on casters is provided in which a swivel is coupled with a connector which in turn is coupled between the shut-off valve and the gas appliance. The swivel maintains its shape and physical characteristics at least up to 800.degree. F. temperature for at least ten minutes. The swivel has a first body member which has a first and second end. A nut is rotatably coupled to the first end of the first body member. The first body member is rotatable about a fixed first axis with respect to the nut which is coupled to the shut-off valve. The swivel has a second body member having a first and second end. The first end of the second body member is rotatably coupled to the second end of the first body member. The first end of the second body member is rotatable about a second axis which intersects the fixed first axis and is rotatable with respect to the fixed first axis.

Abstract: An apparatus is provided whereby a standard percussive-type downhole drill may be utilized in directional drilling. This eliminates the need for less efficient tri-cone type downhole motors in this application. A motor is provided directly on top of the hammer at the end of the drill string, which both rotates the hammer and allows the passage of compressed air to the hammer for its piston operation. A preferred embodiment of the motor is an air-driven turbine with a replaceable connecting subassembly to link the motor shaft to the hammer apparatus.

Abstract: In a transmission for driving the rolls of a rolling line having a number of rolling stands disposed one after another, a respective planetary transmission stage is provided at several output shaft (20) and forms the output rotational speed from a basic rotational speed and an additional rotational speed. The gear wheels (2,23) of the gear wheel transmission trains transmitting the basic and additional rotational speeds are mounted on stationary bearing bushes (3, 26) which project into the hub regions of the gear wheels (2, 23) and are secured in bores or on flange facings of the load-bearing walls (5, 6) of the transmission housing (1). Only one of the gear wheel transmision trains is disposed between the load-bearing walls of the transmision housing, while the other is disposed on the outside stands. This permits the transmission to be of lighter construction and allows greater gear ratios in the gear wheel transmission trains and a smaller distance between the output shafts (20).

Abstract: A resistor grid for diesel electric locomotives and the like has a rigid frame comprising outer metal side pieces and one or more pairs of inner metal side pieces spaced from each other, and columns of resistor ribbon fan-folded between each outer and outermost inner side piece, and between certain inner side pieces. Supporting means interengaging each fold of the ribbons are insulated from and carried on each side by a metal strip which rides on its adjoining side piece so as to accommodate expansion of the resistor ribbon. The ribbon is indented between folds to stiffen it and increase its span and may by provided with a support rod centered between its side pieces. The resistor grid is preferably positioned in forced air cooled resistor banks face-to-face with conventional narrow span grids, and improves the cooling of such conventional banks.

Abstract: A device for machining a plurality of rolls (4) which are mounted ready for use in a rolling stand (3) and form a common sizing pass (6) has at least one tool (5) which is disposed outside the sizing pass (6) for machining the working surfaces of the roll. In order that the shape and size of the sizing pass formed by the rolls is as accurate as possible, a measuring device (8) engages in the sizing pass (6), and a computer (10) compares its actual values with predetermined desired values, the resulting error signals being used to control the tool via servomotors (13, 14).

Abstract: A method and apparatus for transverse, preferably skew, rolling seamless tube blanks, is provided wherein said seamless tube blanks are rolled down by a mandrel rod lying in their longitudinal bore or are rolled onto a mandrel rod at the delivery end. During transverse rolling each tube blank is subjected to a predetermined, controllable torque exerted by the mandrel rod in order to eliminate substantially the formation of pockets in the region of the sizing pass during transverse rolling.

Abstract: A conventional video cassette comprises a tape transport mechanism (1) comprising two reels each with an internally splined tape drive hole, contained in a protective housing (2). The protective housing (2) of the cassette is provided with two circular access holes through which the tape drive holes of the reels can be accessed, and normally the reels themselves are pressed into firm contact with the underside of the cassette protective housing (2) by a leaf spring (3). The device (10) of the invention can be inserted into either of the internally splined tape drive holes and pushed downwardly with compression of the associated leaf spring (3) of the video cassette until the underside of the protective housing (2) is exposed. Thereafter detent members (15) engage beneath the protective housing (2), and the device can be removed from the tape drive hole only by an authorized person using a key (17).