Abstract: An adjustment device for adjusting the relative angular position of two elements pivotally connected to one another, in particular two elements connectable one to the cushion and the other to the back of a seat, the device including a case; first and second gears facing each other inside said case and having a different number of teeth; a ball-and-socket joint arranged centrally within said case to support said second gear in an inclined position relative to said first gear and in meshing contact therewith; first and second co-axial shafts pivotally mounted on said case, said first shaft being rigidly connected to said first gear; key means to prevent rotation of said second gear relative to said case; and transmission means arranged between said second gear and said second shaft to transform a rotation of the latter into a precession movement of said second gear about the center of said joint and in meshing contact with said first gear.

Abstract: A tape transport has two pinch rollers, either of which presses the tape against the capstan with which that pinch roller coacts in order to advance the tape in the desired direction. When power is off, neither pinch roller should press against its capstan. A retraction mechanism includes a spring acting in a direction to withdraw or retract whichever pinch roller would otherwise bear against its capstan when the power is off. However, when the power is on, the mechanism permits the pinch rollers to function in their usual manner.

Abstract: An optically scannable answer sheet booklet is comprised of a plurality of signatures which are folded to provide the various sheets or leaves of the booklet. The opposite sides of each sheet or leaf constitutes a page of the booklet and has printed thereon certain instructions or questions as well as so-called response areas or bubbles which are to be marked by the examinee. The various signatures are each printed with a sequence bar which collectively, if the correct number of signatures are properly inserted, form a recognizable pattern. If a signature is incorrectly inserted, duplicated or omitted, the pattern will be broken or will contain an extra sequence bar which apprises the inspector of faulty booklets.

Abstract: The applicator includes a plastic disc having a central hole therein. Integral with the disc and extending from the upper side thereof is a tubular handle, the bore of the handle being in alignment or registry with the hole in the plastic disc. By means of the handle the disc can be rotatively oscillated against the uppermost paper filter of a stack of such filters so as to induce electrostatic charges thereon with the consequence that the filter clings to the lower side of the disc. The disc is slightly smaller in diameter than the diameter of the paper filters to be transferred, and the peripheral diameter of the paper filters is slightly greater than the diameter of the coffee maker basket. In this way, when the plastic disc and the filter being electrostatically carried thereby is inserted into the coffee maker basket, the peripheral edge of the filter is deflected upwardly, the frictional engagement causing the filter to remain in the basket when the plastic disc is retracted.

Abstract: The grain drill includes a furrow opener, a forwardly disposed seed spout, a rearwardly disposed fertilizer spout, and a deflector plate positioned beneath the fertilizer spout so that a desired amount of the fertilizer discharged from the lower end of the fertilizer spout is deflected laterally. The deflector plate is adjustable forwardly and rearwardly with respect to the seed spout so that the amount of fertilizer flowing over the forward edge of the deflector plate can be controlled by the position of the forward edge of the deflector plate with respect to the seed spout.

Abstract: The animal litter comprises a cellulose litter material that contains a pheromone-like attractant substance which makes the litter attractive to animals seeking a place to defecate and/or urinate. The litter material is pelletized to give the litter a consistency comparable to that of fine gravel. The pellets formed from the litter material hydrate slowly but positively and are disposable in water. The density of the pellets is such that they retain their structural integrity on hydration. The pellets are formed from ground paper which has been moistened with sufficient water to hold the particles together but not so much as to cause the pellets to feel moist. An acid salt may either be added in the water or as a dry powder to the ground paper. This salt carried by the water in the pellets neutralizes the animal urine (and the ammonia-like compounds formed from it) while maintaining the pH of the litter at a level acceptable to the animals.

Abstract: The fence construction comprises any number of panels which include upper and lower angle members having vertical and horizontal flanges. A plurality of vertical rod members having straight shank portions and angled end portions are secured to the angle members by welding the angled end portions of the rod members to the vertical flanges and the shank portions to the edges of the horizontal flanges. Further included in the fence construction is any number of panel extenders which are releasably fastened to the ends of the panels, each extender comprising upper and lower strip members composed of horizontal portions and oblique portions twisted with respect to the horizontal portions, the oblique portions having threaded holes so that bolts can be threadedly carried therein and the free ends of the bolts bear against the upper and lower angle members to hold the extender in place.

Abstract: Integrable analog active filter suitable for MOS monolithic implementation. The filter utilizes only integrating amplifiers and ratioed capacitors thus being implementable in MOS technology and compatible for use in MOS digital systems. Filters of unlimited complexity and having arbitrary transfer functions can be implemented by the integrable analog active filter.

Abstract: The method for trimming printed circuit boards is provided with a beveled cutting edge having a number of nonuniformly or unevenly spaced notches formed therein.

Abstract: A guard casing encloses a substantial portion of the blade of a circular power saw. A cylindrical tube is carried by the casing for connection to a source of vacuum, the cylindrical tube having a slot extending longitudinally from one end thereof for accommodating therein a peripheral segment of the saw blade so that the sawdust produced by the blade is more efficiently collected. The cylindrical tube is adjustably mounted so that its slot can be appropriately positioned relative to the saw blade.

Abstract: A pair of side frames, formed of inverted U-shaped metal tubes and having horizontal brace members, are spaced apart and rigidly connected by crossed tubular members which pivotably engage the metal tubes of the side frame at their ends, one pair of tubular ends being detachable. An armrest pad is hingedly connected across the top of the side frames, such that the pad can be folded down and the side frames collapsed inwardly, after detachment of the crossed tubular members. One of the horizontal brace members supports a cylindrical holder for an oxygen bottle.

Abstract: A wind turbine drives the squirrel-cage rotor of a capacitively excited induction generator. The amount of excitation is controlled in accordance with the output voltage of the stator and hence the speed of the wind turbine. The generating system is capable of operating at high efficiency over a wide speed range, since the electrical output frequency is allowed to vary with the rotor speed. The electrical power supplied by the induction generator is used for heating purposes within a nearby building.

Abstract: A first adapter sleeve snaps onto an outside portion of the plug component of an electrical connector and a second adapter sleeve snaps over an outside portion of the coupling ring which is part of the receptacle component of the connector. The first adapter sleeve has formed therein a number of keyways having a particular angular spacing. In order for the components to be mated or coupled together, the second sleeve must have formed thereon a number of keys corresponding to the number of keyways formed in the first sleeve and also have the same angular spacing. In this way, a plurality of first and second adapter sleeves having different key and keyway patterns can be provided so as to prevent the mismating of otherwise identical connector components.

Abstract: The hand tool in the exemplary situation constitutes a plastic rake head and a readily removable wooden handle. To assure retention of the handle, a chordal groove or transverse notch is provided near one end thereof, and the sleeve or socket portion of the rake into which the end of the handle is inserted is provided with a latch mechanism which includes a resilient tongue on the free end of which is carried a dog biased into the groove or notch through an opening in the sleeve so as to releasably latch the handle to the rake head. To prevent twisting of the handle, the bore of the sleeve is formed with a longitudinal key and a keyway is formed in the end portion of the wooden handle.

Abstract: AC to DC converters used in high-voltage direct-current power transmission lines produce objectionable harmonics. The composite filter herein described is actively tuned for the eleventh and thirteenth harmonics in addition to providing a low impedance path for the higher order harmonics, thereby eliminating such undesired harmonics so that they will not be transmitted over power lines where they can cause telephone interference, undesired heating of electrical equipment and other difficulties.

Abstract: The trommel screen unit includes a screen panel of polyurethane having embedded therein a plurality of longitudinal and transverse fiberglass rods. Marginal portions of the polyurethane panel overlie and are bonded to a rectangular steel frame, the sides of the frame having longitudinally spaced notches which receive therein the end portions of the transverse rod.

Abstract: A metal frame includes top, bottom and side members, each member having an angular cross section. A sheet metal door of unitary construction is formed with a tubular portion at its upper end and a pair of spaced panels depending therefrom. A pair of plastic bushings are loosely received in the opposite ends of the tubular portion, the bushings having flanges that determine the small amount of clearance between the door and the sides of the frame. A rod extends through the bushings and through the flanges of the angled side members to determine the small amount of clearance between the frame and the top and bottom of the door. In this way, the door is free to swing inwardly and outwardly, thereby permitting a dog to readily enter or leave the doghouse.

Abstract: An answer document or form, on which the user darkens certain discrete response areas with a graphite or lead pencil to denote his selected choices or data entries, has a bias bar printed across one end with the same color ink used in printing the remainder of the document. When the document is read by the optical scanner, the light passing through the translucent paper also passes through the printed bias bar. Analog voltage signals are obtained from each of the photocells in the optical scanner and these signals are capacitively stored, then converted to digital values. The digital values are averaged and the individual digital values for each photocell are compared with the computed average to check for bad cells. If a poor photocell response persists for a predetermined number of answer documents, the entire scanning operation is stopped.

Abstract: The shutter mechanism includes a blade pivotally mounted intermediate its ends. Nearer one end of the blade is an opening through which the subject is viewed when focusing the camera and through which the picture itself is later taken as the blade swings from one side of the optical axis to the other. Nearer the other end of the blade is a permanent magnet which is cooperable with three electromagnets. Appropriate energization of the electromagnets effects the various blade movements.

Abstract: A detachable hydraulic coupler includes a male and female portion each including a valve which closes to prevent leakage when the coupler portions are detached. The valves do not directly contact each other when the coupler is closed, thereby simplifying the closing operation. The section of the female portion enclosing the male portion includes a series of locking balls slidable in apertures and which extend into a groove in the male portion to lock the coupler portions together. A slidable collar encircling the female portion normally holds the locking balls in locking position.