Abstract: A wing section equipped rod weeder implement is provided wherein the implement includes a center section and a pair of opposite side wing sections which may be swung upwardly to retracted positions for moving along roadways or through narrow fence openings. The center section rod weeder shaft is driven by a reversible variable speed hydraulic motor and the opposite ends of the center section rod weeder shaft include universal joints removably supported therefrom for selective reversed mounting on the center section rod weeder shaft ends and each universal joint defines a swivelly supported inwardly tapering threaded socket. The adjacent ends of the wing section rod weeder shafts include tapered threaded male ends removably threaded within the sockets. The threaded connections are of the non-jamming type wherein they may be readily unthreaded.

Abstract: A work vehicle with a rolling-control mechanism, having a ground-engaging implement to be connected via a three-point link mechanism adapted to be free to effect adjustment with respect to the connection positions, has a sensor to detect slanting of the vehicle body. It also has electrical circuitry for correcting the control gain based on the detection results thereof, in response to the adjustment of the implement-attaching width and of the connection positions of three-point link mechanism. It may further be provided with a sensor and a control mechanism for effecting the control to minimize errors as are particular to using, as the rolling-control mechanism, torsional displacement in the three-point link mechanism.

Abstract: An adjustable width plow having its diagonal frame pivoted to a forecarriage unit at a point such that pivotal adjustment of the frame relative to the forecarriage results in both a variation in the cutting width and a transverse displacement in the proper amount of the first plow bottom in the appropriate direction.

Abstract: A portable sod cutting machine having a light weight tubular frame and a split cutting knife to reduce vibration. The split cutting knife includes two horizontal undercutting blades facing each other and substantially touching each other, and two side cutting blades one extending upwardly from each side of each undercutting blade. The undercutting knives are reciprocated oppositely by a common drive shaft having eccentric stub shafts connected to crank arms which are connected to the cutting knives. Swinging handles are hingedly connected to the rear of the machine and swing between a normal rearwardly extending operating position and a storage position in which the handles project forwardly one on each side of the frame.

Abstract: A tennis racket frame, having a heart piece bridging opposite sides of the frame, is provided at the opposite sides of the frame with members interfitting with the tubular heart piece and bolted to the frame members.

Abstract: The toy construction set includes a plurality of blocks and at least one base plate. Each of the blocks has one or more axially shiftable and rotatable coupling cams mounted therein which can be projected from the bottom of the block to effect vertical attachment with another block or with the base plate, using a suitable hand tool to do so. The preferred base plate contains a number of appropriately located coupling cams so that it can be attached either above or below a number of blocks.

Abstract: A device for separating clods and stones from the soil includes a frame adapted to be drawn or carried across the land and one or more elements carried by the frame for raising the surface layer of material from the land and passing it to a first conveyor having apertures therethrough to permit material on the conveyor to pass through the conveyor and to be returned to the land, there being disposed above the conveyor a surface adapted to bear against material on the conveyor so as to crush and/or abrade material on the conveyor and thereby reduce its particle size to permit it to pass through the apertures. The first conveyor is adapted to discharge particles of material retained thereon to a device for returning those particles to the land on either or both sides of the device. The surface and/or the first conveyor are adapted to move apart from one another to permit the passage therebetween of resistent material.

Abstract: A crack and crevice weeder device for cleaning undesirable growth from cracks or crevices in sidewalks and expansion joints between sidewalk and street. A V-shaped cutting head is attached to an end of an U-shaped steel rod and a triangular-shaped scraper is attached to a point on the U-shaped rod. The U-shaped rod is fixed to a long handle which enables an operator, while standing, to remove undesirable growth from cracks, crevices or expansion joints by pulling the weeder towards him while simultaneously applying a downward pressure.

Abstract: A blade cross slope sensor includes a first T-member having a stem mounted on the drawbar of a road grader for rotation about a first axis parallel to the axis about which the blade rotates and being coupled to the blade for rotation through the same angle. A yoke is pivotal on the arms of the T-member and a second T-member is pivotal on the yoke about a second axis perpendicular to the first axis. A scissors assembly has a first portion mounted on the grader main frame for pivotal movement about a third axis parallel to the direction that the grader travels and a second portion coupled to the first portion for pivotal movement about a fourth axis parallel to the third axis. The second scissors portion is also pivotally connected to the arms of the second T-member which defines the true cross slope of the blade.

Abstract: A crossbow has a prod in two parts, each of which is pivotally connected with the stock so that the prod parts can lie alongside the stock when the bow is not in use. When the bow is prepared for use, the prod parts are clamped in operative positions by a mechanism which includes a handle and which provides a substantial mechanical advantage to the operator.

Abstract: A rotary tiller apparatus includes a main support frame having a first member that is pivotal in a generally vertical direction and a second member that is pivotally attached to the first member and pivots in a generally horizontal direction. The rotary tiller apparatus is pivotally mounted on a vehicle, such as a tractor for removing weeds and the like between plants planted in rows. A first hydraulic cylinder is provided to pivot the first support member in the generally vertical direction. The first hydraulic cylinder is attached to the first support member at one end and to the tractor at the other end. A second hydraulic cylinder is positioned to pivotally move the second support member with one end of the second hydraulic cylinder being attached to the second support member and the other end of the hydraulic cylinder being attached to the first support member.

Abstract: The present invention provides the swimmer and or diver with protection against a shark. A probe held by the user can be deliberately armed before use. When armed the probe has protruding from its front end a dart. The dart is provided with a trigger restrained from operating by a trigger washer. When the dart is plunged into the shark's body it penetrates the skin and enters the body. The trigger washer no longer restrains the trigger which then allows a gas from a cartridge to enter the shark's body cavity. The gas bloats the shark's body causing the shark to rise in the water having lost the ability to maneuver.

Abstract: Air gun apparatus for firing missiles 11 including a gun and a replaceable cartridge assembly. The cartridge assembly includes a casing having a detachable hollow nose, a pressure cylinder slidably located in the casing, and a valve mechanism normally biased by a valve spring in the cylinder to close a gas discharge path from the interior of the cylinder to the hollow nose via a removable hollow valve abutment member. The valve mechanism is openable by forcible movement of the cylinder towards the hollow nose. The gun includes a seating at a breech end of a barrel, a breech, and a breech block assembly. A firing spring acts on an inertia member which is releasable by a trigger mechanism.

Abstract: In a self-propelled ballast cleaning machine which comprises a ballast excavating chain having an output, a hydraulic drive for moving the ballast excavating chain, a ballast screening and storing device arranged to receive the excavated ballast from the output for separating the excavated ballast into waste and cleaned ballast and for storing the cleaned ballast, and a hydraulic vibrating drive for imparting vibrations to the ballast screening and storing device, a control arrangement operates the hydraulic drives, the control arrangement including a control element having an input and an output, the input of the control element being connected to the chain moving drive and the output of the control element being connected to the vibrating drive for changing the frequency of the vibrations imparted to the ballast screening and storing device analogously to a respective setting of the control element for storing the ballast in the device.

Abstract: A blow dart game comprises a tube having an abutment therein for abutting against a dart which is inserted into the tube, thereby preventing the dart from coming out of the tube and being ingested or swallowed by a user. The abutment may be provided directly on the tube, or on a mouthpiece which is connected to the tube at one end of the tube. The darts have suction cups at the front ends thereof and a seal for providing a substantial air seal against the inner surface of the tube. The dart further has a shock absorbing section at the forward portion thereof to enhance its adherence to non-flat and/or non-perpendicular target surfaces. An impact member is provided in some of the darts to improve adherence to the target surface.

Abstract: A blade control device comprises a change-over switch for providing light receiving position deviation signal sent out from a light receiving device into a light receiving device control system as a command value, and a device for measuring the change in the height of the light receiving device, whereby a topographic survey is conducted based on the height change of the light receiving device.The blade control device may further be provided with a second change-over switch for providing the command value outputted from a manual command value setter during a manual operation into the light receiving device control system, whereby returning the blade to a previous position is carried out in accordance with the operation of the second change-over switch.

Abstract: An apparatus for a tractor having a rear and front implement attachment mechanism. Each such mechanism has a hydraulic power lift which acts on it. The power lifts have in common a regulator and control device with a changeover valve. By activating this changeover valve, selectively one of the power lifts can be regulated in conformity with the provided adjustment features, such as the actual values of the position, of the cylinder pressure, etc., while at the same time the other power lift is connected with a control member for random influence of this last-mentioned power lift.

Abstract: A seated-operator type tractor has a vehicle proper (1), equipped rearwardly thereof with a link mechanism (6) and a scraper (9) for ground-leveling. The vehicle (1) is further provided with: a position-controlling mechanism (34) for controlling up-and-down position of the scraper (9); an automatic control mechanism for maintaining the scraper (9) in its left-and-right horizontal posture, by a sensor (50) therefor; a controlling valve (24) for controlling blade-angle adjustment of the scraper (9); and a manual switch (47) disposed near at hand of the seated operator, for shifting over the vehicle (24).

Abstract: A recreational device for producing the thrill of a free fall on the users, which includes a housing, a shock absorbing cushion throughout the bottom of the housing, and an inwardly extending peripheral deck on the top of the housing. The deck has an area sufficient to accommodate a predetermined number of persons and arranged to provide a launching platform for allowing persons to jump into the housing. A plurality of elastic bands have their two opposite ends fixedly attached to the interior surfaces of the side walls of the housing, each individual elastic band extending in a horizontal position throughout its length across the housing.

Abstract: In a mobile ballast cleaning machine comprising a frame, an arrangement for excavating the ballast and for conveying the excavated ballast, a first vibratory and vertically adjustable ballast screening installation mounted on the frame and having an inlet to receive the conveyed ballast from an output of the ballast excavating and conveying arrangement and to separate the ballast into a cleaned ballast component and a waste component, and conveyors for redistributing the cleaned ballast component and for removing the waste component: a further ballast screening installation mounted on the frame, separate drives for vibrating and for vertically adjusting the further ballast screening installation, and a remote-controllable conveyor arranged selectively to receive the ballast from the ballast excavating and conveying arrangement output and to deliver it to an inlet of the further ballast screening installation.