Abstract: A belt including a pair of opposite layers of sheet material and subdivided into a series of pockets for receiving pellets of shark-repulsive chemical. One of the pellets is untreated so as to dissolve in water relatively quickly, another of the pellets is impregnated with water soluble glue, another of the pellets is coated with the glue while a fourth of the pellets is coated with epoxy for preventing water application to the chemical of the pellet until the pellet is manually broken.

Abstract: A belt including a pair of opposite layers of sheet material and subdivided into a series of pockets for receiving pellets of shark-repulsive chemical. One of the pellets is untreated so as to dissolve in water relatively quickly, another of the pellets is impregnated with water soluble glue, another of the pellets is coated with the glue while a fourth of the pellets is coated with epoxy for preventing water application to the chemical of the pellet until the pellet is manually broken.

Abstract: An athletic exerciser comprising a fixed support post having a support pipe telescoped in and rotatable in the support post and supporting a pair of exercise swing arms from its upper end. The swing arms have downwardly depending arm portions connected at their ends by handlebars. A bench is supported at its rear end with respect to the support post by means of a vertical pivot rod extending into a corresponding tube portion carried by the post so that the bench can be swung sidewardly or can be removed completely from the post by lifting the pivot rod out of the tube portion.

Abstract: A suit for protecting the wearer against shark attack including a plurality of cells formed in the material of the suit which contain a shark-repulsive chemical. The material of which the suit is made includes an inner ply of strong filamentary fabric capable of resisting shark bite and an outer ply of relatively thin, frangible material, with the cells carrying the shark-repulsive chemical being formed between the two plies. Other chemicals alternately may be used in the cells for other purposes, such as for heating purposes on the interaction of two initially separated chemicals in the cells.

Abstract: An athletic exercising device comprising a handle mounted on swing arms pivotally mounted on a support tube that is vertically moveable on an upstanding standpipe and a spring loaded set pin for adjustably fixing the support tube in desired vertical positions on the standpipe. A piston-cylinder assembly is carried by the tube, and a closed hydraulic circuit is connected to the two ends of the cylinder. A piston rod is connected to the piston of the assembly and to the swing arms so that the arms and handle can be moved for exercising purposes against the action of the fluid acted on by the piston. The tube allows the assembly to be inverted on the standpipe and also to be rotated on the standpipe through 180 degrees for different exercises.

Abstract: A grand piano lift comprising a dolly on which the piano is placed and having a hydraulic cylinder fixed in vertical disposition to the dolly in the vicinity of each of the three legs of the piano. A piston is slidably disposed in each of the cylinders and has a piston rod extending from the piston fixed to a pedestal that contacts the floor or platform from which the piano is to be supported. An operator operated UP switch is electrically connected with a source of hydraulic fluid under pressure so that the operator can cause fluid to be applied to the cylinders from the source and so that the cylinders are effective to raise the dolly and piano. A similar DOWN switch causes this fluid to be drained from the cylinders to cause the piano to be lowered.

Abstract: A drumstick having a handle portion that is sanded to produce circumferentially extending sanding scratches and ridges for rendering the handle portion relatively non-slippable in the hand of the musician. The tapered portion of the drumstick on which the striking bead is formed or mounted and also the butt end of the stick having a coating of polyurethane to render them capable of taking drum or cymbal striking contact without damage and to seal these parts against moisture. The handle portion after sanding to produce the sanding scratches and ridges has a relatively thin coating of water repellent on it that will allow the musician to feel the sanding ridges while also sealing the handle portion against moisture.

Abstract: A concrete forms assembly for casting a concrete stair and comprising two tiers of panels of sheet material, each panel being channel shaped in cross section. Each tier of panels comprises a pair of opposite side panels and a front panel bridging ends of the side panels, and the side panels of the second tier are shorter than the side panels of the first tier so as to leave an exposed space to define a first or intermediate step of the stair. Clips are swingably disposed on the upper flange of each of the side panels in the lower tier to engage with the lower flanges of the front panel in the second tier, and hooks are carried by the upper flanges of each of the side panels for connecting the upper flanges of the front panels to the front panels in the respective tiers.

Abstract: A drumstick is made of initially flat fabric rolled upon itself repeatedly about a central axis. Material impregnating all of the resulting several layers of fabric and solidified holds the fabric tube together.

Abstract: A tray for a machine operative to sequentially pull jacketed flexible magnetic disks (which may be termed "diskettes") into a data transferring position in the machine from the tray. The tray has a few open top store grooves for a few diskettes desired to be individually used and has a magazine detachably mounted thereon which has a bottom and a top with a greater number of diskette store grooves in the bottom and top for a group of diskettes to be used together. The machine is operative to partially withdraw and to return to original positions diskettes from the open top store grooves or from the grooves in the magazine.

Abstract: A print ribbon driving mechanism including a switching bail swingingly mounted on a reciprocatively mounted support movable between two opposite spindles carrying print ribbon spools. The spindles have ratchet teeth, and the switching bail has a pair of opposite pawl surfaces for engaging the ratchet teeth as the support and bail are moved in opposite directions. A trigger lever is provided on each of the spindles which is responsive to the existence of ribbon on the associated spools so that the trigger lever drops into an operative position on depletion of the ribbon from the associated spool, and the switching bail is provided with two opposite camming surfaces adapted to engage the trigger levers in their operative dropped positions for swinging the switching bail into a position to engage the ratchet teeth of the spindle of the dropped trigger lever so as to wind ribbon onto this particular spool.

Abstract: A carriage assembly for holding a pair of opposite transducers in contact with the opposite sides of a flexible magnetic disk including a swing arm for carrying each of the transducers. E-shaped leaf springs support the swing arms with respect to a carriage using the two outer legs of each of the springs which are substantially flat and unstressed when the transducers are in contact with the disk. The central legs of the E-shaped springs are connected together so as to urge the swing arms and transducers together and allow the swing arms and transducers to be parted for the insertion of a disk into operative position. A gimbal spring and a loading spring support each of the transducers with respect to one of the swing arms. The gimbal springs, loading springs and E-shaped springs are balanced with respect to each other so as to hold the transducers in light data transferring contact with the disk.

Abstract: A drive machine for magnetic diskettes of the type including a flexible disk rotatably disposed in a jacket having aligned radial slots in the two thicknesses of the jacket. The machine includes a pair of transducers extending through one of the slots into contact with one side of the disk and a pair of backup pads effective on the other side of the disk respectively opposite the pair of transducers and swingably mounted by swing arms to the frame of the machine. A motor driven cam plate with a spiral groove and a follower therein are used for moving the transducers radially on the disk for registry with different magnetic tracks thereon, and the cam plate has a peripheral portion that moves the swing arms to disengage the pads from the disk at outermost magnetic tracks for the transducers. The disk is clamped between a rotatable drive spindle and a collet, and the collet is carried on a swing arm mounted on the frame.

Abstract: A printing machine comprising a flat, substantially horizontal, guide portion on which the document to be printed is initially placed, a curved guide portion connected with the horizontal guide portion across which the document may be pushed manually and a final vertical guide portion connected with the curved guide portion providing a vertical passage across which a print head traverses for the purpose of printing on the document as it moves upwardly through the vertical passage. Drive rolls are provided in the vertical passage just above the line of traverse of the head for first continuously pulling the document upwardly through the passage once it has been manually pushed to this point and then incrementing the document upwardly through the machine and in the vertical passage for each of the lines of print provided by the print head.

Abstract: A suspension for a magnetic transducer including a normally flat gimbal spring in the form of a figure eight, with a pair of tabs or ears at the sides of the eight by means of which the spring is mounted; and a folded backup spring having legs extending from a mounting side to the other side and then back again, with a depending leg and flange portion effective to provide pressure on the center of the gimbal spring and transducer so that the backup spring provides resilient backup force against translation of the transducer on its main axis and the gimbal spring provides resilience against transducer pitching and rolling.

Abstract: A servo system for centering a transducer over boundaries between adjacent servo tracks on a magnetic disk in which the servo tracks are each formed by alternate long and short magnetic segments, with the short segments in one track being centered with the long segments of adjacent tracks. The servo system includes a frequency doubler circuit for producing a uniform frequency square wave signal of double the fundamental frequency of the analog signal picked up by the transducer from the servo encoding, a filter connected with the transducer for producing an analog double frequency signal based on the analog signal from the transducer, a synchronous detector functioning as a multiplier for multiplying the double frequency square wave signal with the analog double frequency signal from the transducer, and a filter for averaging the resultant pulsating position error signal to provide a steady state position error signal for any particular position of the transducer over a pair of adjacent servo tracks.

Abstract: A magnetic head assembly for reading and/or writing a track of magnetic information on a moving magnetic medium and for erasing edge portions of the track. The head assembly comprises a central data transfer magnetic core including a pair of core portions providing a data transfer gap on an active face of the head assembly with a read/write coil on one of the core portions. The head assembly comprises also an erase core which includes a pair of erase core portions extending along and in contact with one of the write core portions, another pair of erase core portions respectively in alignment with the first named erase core portions and providing therewith erase gaps on the active face of the head assembly that extend transversely of the direction of movement of the magnetic medium on the active face and a core portion on which an erase coil is disposed bridging and between the last two mentioned erase core portions.

Abstract: An electrical counter including a pair of counter segments connected in cascade. Each of the counter segments has a capacity of two bits and counts in Gray code of 00, 01, 11, 10 and 00 on succeeding pulses to be counted which are applied onto the segment. The second segment includes an AND circuit which is satisfied when the count of the preceding segment is 10 so as to GATE the pulse supplied at that time on to the second segment so that the second segment has its value changed at the same time as the first segment has its value changed from 10 to 00.

Abstract: Stepper motor control circuitry including a phase locked loop circuit formed by a phase detector outputted to a filter and a voltage controlled triangular and square wave generator which has a frequency control input terminal connected to the output of the filter and which provides a square wave on an output thereof connected as an input to the phase detector. An oscillator drives the phase detector, and the outputs of the generator are connected as inputs to a pulse width modulated driver which has its outputs connected to the coils of the stepper motor. A differential amplifier is connected across one of the coils of the motor, and a balanced modulator synchronous detector or multiplier has two inputs one of which constitutes an output of the differential amplifier and the other of which is a connection to the square wave output of the generator.