Abstract: A fume detector including a gas sensor having a heater element and a variable impedance element associated therewith whose impedance decreases in the presence of toxic gases or fumes, or a decrease of free oxygen in an atmosphere being monitored. A load resistor in series circuit with the gas sensor and a pair of series connected potentiometers in parallel circuit with the gas sensor and the load resistor form a Wheatstone bridge. A first voltage comparator connected to one of the potentiometers and a reference voltage provides a signal when the supply voltage decreases below a predetermined level. A second voltage comparator connected to the other potentiometer and a junction between the gas sensor and the load resistor provides a signal when the gas sensor fails in the open circuit condition. A third voltage comparator connected across the bridge provides a signal when a toxic gas condition exists.

Abstract: A housing for magnetic particle devices comprising first and second housing members adopted to be assembled in side-by-side axial relation, at least one of said housing members having an annular cavity formed extending inwardly on one side thereof adjacent to the other housing member, an annular tapered surface formed on the side of one of said housing members at an intermediate location radially of the annular cavity and a sidewardly extending annular flange formed on the other housing member for engaging the annular tapered surface to divide the annular cavity into inner and outer cavity portions when the first and second housing members are connected, the annular flange separating the cavity into separate portions on opposite sides thereof, and members connecting the first and second housing members together whereby the annular flange moves axially against and is deformed by engagement with the annular tapered surface to seal between the separate cavity portions.

Abstract: A tension control system for use with a device which includes at least one roll over or around which a web or strand of material passes, a tension responsive transducer associated with the roll, a reference tension selector, a drive unit for effecting movement of the web or strand over or around the roll, and a tension controller associated with a tension control roll, the tension controller responsive to the outputs of the transducer and of the reference tension selector for controlling the torque applied to the tension control roll in order to control tension on the web or strand, the improvements comprising a control circuit connected between the transducer and the tension controller including an error limiter circuit responsive to the outputs of the transducer and of the reference tension selector to produce an error signal, the control circuit having circuit elements responsive to the error signal and connected to vary the torque applied to the torque control roll in a manner to maintain the web or stran

Abstract: A control circuit for vending and other coin controlled devices including a first accumulator for accumulating the price of each vend, said accumulator having a first input where signals that represent each vend price are entered, a second input where signals for initiating a vend operation are entered, a third accumulator input, and an accumulator output, a pulse generator having an input connected to the third accumulator output, said pulse generator having an output operatively connected to the third accumulator input, said pulse generator producing outputs to enter into the accumulator whenever a vend operation is initiated and until the amount entered into the first accumulator equals the vend price also entered therein, a second accumulator having an input operatively connected to the output of the pulse generator and including means to accumulate the total of all vend prices entered in the first accumulator, and a readout device associated with the second accumulator where the running total being accum

Abstract: A precision honing device including a substantially tubular honing member having an outer work engaging surface, an axially tapered inner surface, a full length slit through the device along one side thereof, and a layer of a relatively hard wear resistance abrasive substance applied to the outer work engaging surface, the work engaging outer surface of the device having an axial taper formed by a first portion extending to adjacent one end that has a first rate of taper, a second portion extending to adjacent the first portion having a rate of taper that is less than the rate of taper of the first portion, and a third tapered portion extending from the second portion on the opposite side thereof from the first portion, the third portion being axially tapered at a reverse taper relative to the tapers of the first and second portions, the taper of the first portion causing a greater rate of stock removal during honing than the taper of the second portion.

Abstract: This invention relates to an automatic damper device for use in exhaust flues, such as flues of combustion devices such as furnaces and water heaters, devices such as air conditioners, and the like, to prevent undesirable loss of hot air or cold air out the flues during periods when no combustion is taking place. The damper has a rotatable damper plate held in normal open position which provides a desired fail safe in the open position assurance. The damper is also adapted to remain in the open position during periods of combustion in the furnace or water heater but otherwise be retained in the closed position to avoid the unnecessary loss of heated air or cooled air.

Abstract: A backflow preventer valve including a housing structure having inlet and outlet ports therethrough for attaching to system conduits, a chamber formed in the housing, a pair of spaced valve seats associated with one of the ports including an air space formed between the valve seats, and a movable valve assembly including a first member hingedly attached to the valve housing for movement in the chamber between a closed position adjacent to the valve seats and an open position angularly related to the closed position, and the valve assembly having a clapper portion defined by relatively movable inner and outer members, a flexible valve member including first and second portions and separate members for attaching the flexible valve member respectively to the inner and outer clapper members, the first portion of the flexible valve member being engageable with one of the pair of spaced valve seats in the closed position thereof and the second portion being engageable with the other of the pair of valve seats in th

Abstract: A knurling tool including an elongated body member having opposite ends and a bore extending therein from one end, the bore being spaced from and acutely angularly related to the axis of the body and extending in part through the side of the body, the bore having an enlarged portion intermediate the ends thereof, an elongated roller having an enlarged annular portion intermediate the ends thereof positioned in the body bore, with the enlarged roller portion being positioned in the enlarged bore portion, the enlarged roller portion being defined by an annular side surface angularly oriented relative to the axis thereof, and a pilot member cooperatively engageable with the body member and with the roller in position to trap and hold the roller in the bore.

Abstract: A control circuit for accurately controlling the duration of a welding operation.

Abstract: A Prefabricated Panel Module Construction for use in constructing walls and enclosures comprising a substantially rectangular frame assembly with a substantially flat rectangular sheet of sheathing material attached thereto. The frame assembly includes four side framing portions preferably of substantially uniform cross-section dimensions. The sheathing material has side edges defining a substantially rectangular shape and is attached to the framing portions of the frame assembly such that each of the framing portions is associated with a respective side edge of the sheathing material and such that the sheathing material projects beyond at least three sides of the frame assembly to form overhangs thereat and extends along the remaining fourth side framing portion of the frame assembly to at least partially overlap the framing portion along its length.

Abstract: A gaging head for the in process gaging of a surface such as a cylindrical surface while it is being honed, ground, or machined by a device which increases the diameter thereof, said head having a work engaging portion of a size and shape to accurately test measure the diameter of the surface, a portion for attaching it to a gaging device, and an adjustment feature for adjusting the work engaging portion to increase the preset accuracy thereof. The present invention also resides in a novel fixture for preadjusting the subject gaging heads.

Abstract: Improved guide means for supporting a rotatable member or mandrel during reciprocating motion thereof including a machine feed portion having a pair of guide rails spaced apart on a fixed support structure, a plurality of longitudinally spaced support members for supporting each of the guide rails at spaced locations therealong, each of which has an upwardly facing rail engaging surface defined by angularly related surface portions, a carriage structure having spaced rail engaging support members mounted for movement on the respective rails, and apparatus associated with the rail support members including mechanism adjustable to precisely align the support members with the respective rails.

Abstract: This invention relates to vehicle bumpers and more particularly to vehicle bumpers with frangible or resiliently collapsible parts which break-away or distort on impact to minimize the loss of control which often occurs when metal and other more usual types of bumpers bend on impact and puncture tires or produce undesirable braking action or become entangled with other parts of the vehicle. This invention is characterized by a vehicle bumper construction wherein at least a portion thereof is comprised of a frangible and collapsible or otherwise deformable end portion made of materials such as plastic impregnated fiber glass or rubberlike materials which extend in front of one or both of the vehicle wheels, which end portions may be attached to reduced length metal or wood bumpers and fracture and breakoff or distort on impact but do not bend into contact with other parts of the vehicle.

Abstract: The invention relates to a wallpaper applicator by means of which wallpaper can be fed on to a wall and adhered thereto with the assistance of one or more rollers rotatably mounted on the applicator. The applicator can be adapted to single-handed operation and can incorporate a water tank so that ready-pasted wallpaper can be soaked in the applicator immediately before being applied to a wall.

Abstract: A precision honing mandrel including a tubular honing member having a helical, straight or other shaped groove therethrough, a substantially cylindrical outer surface, a tapered inner surface, and a layer of a relatively hard wear resistant abrasive substance applied to the cylindrical outer surface, an arbor for mounting said honing member including a first arbor portion for mounting on a honing machine, and a tapered second arbor portion for receiving said honing member thereon, a guide member mounted on the opposite side of the honing member from the first arbor portion, said guide member having an end surface in abutment with one end of the honing member and a tapered inner surface for cooperating with the tapered arbor portion, a keyway formed in said tapered arbor portion and aligned slots in the honing member and in the guide member adjacent the abutting ends thereof, a key member positioned to cooperate with said aligned slots and with said keyway to prevent relative rotational movement between the ho

Abstract: An apparatus for gaging a workpiece surface during an enlarging operation thereon, said enlarging taking place by a working member which enters the work surface from one direction and by reciprocally moving the workpiece relative to the working member during said operation, said apparatus including a support structure with a gaging member thereon which is located to engage the workpiece opposite from the working member in position to be engaged by the workpiece adjacent to the workpiece surface during each cycle of reciprocal movement between the workpiece and the working member, said gaging member being of a size to be able to enter the workpiece surface only when the workpiece surface has been enlarged to some predetermined size, structure supporting the gaging member including a yieldable member on said support structure normally biasing said gaging member in a direction toward the workpiece, and mechanism for detecting movements of the gaging member relative to the support structure including a sensor ope

Abstract: An improved one piece cooking pan designed especially for use in baking pizza pies or like food products in a pre-heated oven, the pan having a substantially flat bottom portion with a plurality of perforations uniformly distributed over the entire extent thereof for directly exposing a substantial portion of the lower dough layer of a pizza pie or the like food product to the cooking heat of the oven. The perforations preferably have filleted upper edge portions and are uniformly distributed over the pan surface such that the ratio of the perforated surface area of the bottom portion of the cooking pan to the total surface area thereof is in the range from approximately 15 to 40 percent. The filleted upper edge portion of each perforation allows the heat to be distributed relatively more uniformly over the exposed areas of the product being cooked and avoids undesireable concentration of the cooking heat.

Abstract: A device for holding and supporting the mouth or open end of a flexible bag such as a plastic trash bag or the like in an open condition, which includes relatively rigid elongated members, one of which is pivotally connected to the other at an intermediate location, projections on the members in position to engage a bag adjacent to the mouth thereof to open the bag mouth, and a device connecting said elongated members operable to maintain the projections engaged with the mouth of the bag under tension to maintain the bag in an open condition. The invention is also characterized by being adjustable for use by left and right handed persons and by being constructed so that the bag can be made to extend in either opposite direction therefrom.

Abstract: An apparatus for detecting objects such as coins and the like and for generating signal responses that depend on the metal content or other characteristics of the object or coin, which apparatus includes a detector circuit including an oscillator device having a coil portion for producing a frequency change due to the presence of an object or coin in the field thereof, said detector circuit producing output responses to represent the presence of objects or coins having certain preselected characteristics, and other control circuits including a circuit portion responsive to the output responses of said detector circuit for inhibiting the operation of such control circuits. The present device may also include a coin handling apparatus which prevents return to a customer of an object or coin that has characteristics that are not acceptable for vending, change making, or other functions.

Abstract: An apparatus for measuring and monitoring the tension on a web or strand as it extends and/or moves over and around a roll including a support assembly for supporting at least one end of the roll, said support assembly including a bridge structure having spaced connected bridge portions aligned with the roll on opposite sides of the axis thereof, a mounting member attached to anchor one end of the bridge structure in fixed position, a diaphragm member attached to the opposite end of the bridge structure, a mounting structure for attaching the diaphragm member to the roll, at least two and preferably four strain sensitive gage members attached to one of said spaced connected bridge portions, and a bridge type electric circuit including circuit connections to said strain sensitivie gage members.