Abstract: An apparatus for controlling the pressure of a gas in a gas line includes a source of liquefied gas maintained at a prearranged gas pressure, an evaporation-inducing device connected to the source of liquefied gas and to the gas line, and a self-actuating valve disposed in the feed line for releasing a gas stream from the source of liquefied gas upon a predetermined pressure in the gas line falling below a prearranged pressure in the source of the liquefied gas, less a pressure loss in the feed line, so that the pressure in the gas line is substantially maintained at the predetermined pressure.

Abstract: A small adhesive plastic insert and/or a magnetic insert, mounted in an arm bracelet, a finger ring, a wrist watch or other arm ornament and shaped to conform to the appearance of the bracelet, ring, watch or ornament, permits the wearer of the bracelet, watch or ornament to pick up small objects on flat surfaces without difficulty. The insert is shaped and colored to harmonize with the appearance of the bracelet, ring, watch or ornament. The insert is removably held, for example by a force fit, and may be replaced when dirty.

Abstract: A torque limiting overload coupling for use in connecting rotating and rotatable parts together, first and second connectors couple the drive shaft to another shaft, or flange or dial of a machine, such as an indexing machine, a series of bearings are seated intermediate the pair of connectors with an adapter cooperating with one of the connectors for providing a seating of the said bearing, as at one side, while a diaphragm type bearing seat cooperates with spring means for biasing against the bearings and furnishing their seating as against the other connector, and one or more pins interconnect between the first connector and the diaphragmed bearing seat for insuring the simultaneous rotation of both connectors, and their connecting shafts, flanges, or dials, as during normal operation of the designed machinery.

Abstract: A suspension for an automatic clothes washer tub which supports the clothes container, agitator and driving mechanism, comprises a combination skate and rocking support device, the machine frame supporting the device for horizontal movement and the device supporting the tub for rocking movements. Connection of the tub with the device is effected by means of oblique cooperating surfaces on the tub support structure and on the device in generally pyramidal orientation and providing substantial stability for the tub in normal operation of the machine. Biasing means between the tub and the frame normally biases the tub and the device toward an equilibrium position.

Abstract: A method and apparatus for reforming and straightening damaged bodies of vehicles whereby corrective forces are applied to the vehicle through one or more elongated force transmitting elements. A measuring bridge is coupled to the vehicle by means of a plurality of vertical elements. The vertical elements attached to datum points on undamaged portions of the vehicle are restrained from movement relative to the measuring bridge to properly orient it to the vehicle. In addition, vertical elements attached to datum points in damaged portions of a vehicle are supported on the bridge for movement in two perpendicular directions and a plane parallel to the vehicle and are extensible along their length to permit the vertical elements to follow the reforming of the vehicle during the application of force. The measuring bridge is supported by a plurality of air pressure cylinders to maintain proper orientation of the bridge with respect to the vehicle.

Abstract: A water-filled cylindrical tank is provided for explosive forming with improved means to damp ringing and to cushion shocks due to explosions within the tank. Damping is by means of an annular disc connected within the open top of the tank by rubber-in-shear mountings, and cushioning of the side wall of the tank is by means of a ring of vertical lengths of weighted hose.

Abstract: A transducer is disclosed for placing on top of a pile to indicate the force imposed on the pile by the hammer driving the pile. The transducer includes a body made of a material of a known modulus of elasticity. The body has first and second parallel surface areas on opposite sides thereof that face the pile and the hammer respectively. One of the surface areas comprises the co-planer surfaces of a plurality of spaced flexure elements that are spaced outwardly from the adjacent surface of the body. Each flexure element is connected to the body by supporting arms that are integrally connected to the flexure elements and the body to transmit the force imposed on the flexure elements to the body. Strain gauges mounted on the supporting arms measure the strain in the arms due to the force of the hammer from which the force imposed by the hammer on the pile can be determined.

Abstract: An automobile fuel gauge is used for an automobile wherein the operation of an electromagnetic fuel injection valve is controlled by a control signal supplied from an electronic fuel injection control system, thereby regulating an amount of fuel supplied to an engine cylinder. The fuel gauge includes a counter circuit for counting pulse signals included in the control signal and related to the opening of the electromagnetic fuel injection valve. The total length of time for which the electromagnetic fuel injection valve is opened is measured from the number of said central pulse signals issued, thereby determining the amount of fuel supplied to the engine cylinders through the electromagnetic fuel injection valve thus measuring the amount of consumed fuel.

Abstract: A test stand for an internal combustion engine testing system is disclosed. The test stand permits the engine to substantially freely vibrate such that engine imbalance can be measured. The test stand includes a cradle and a support assembly, having a housing and an inflatable bladder member. The bladder member supports the cradle during the testing operation.

Abstract: A marine pipe riser, through which wells may be drilled during offshore drilling operations, is provided with an instrumented section equipped with stress-measuring elements so that loads and stress on the pipe riser may be measured.

Abstract: During the analysis of sample oil from an oil bearing formation, drilling fluid oil filtrate invasion into a cored oil bearing subsurface formation is detected in a way that does not require the use of special chemicals or tracers. Significant oil filtrate invasion is detected by determining the relative quantities of the same two hydrocarbon materials in the formation oil, drilling oil, and sample oil. Preferably, each hydrocarbon material is one or more hydrocarbons selected from the group consisting of hydrocarbons with eight carbon atoms through hydrocarbons with thirty-five carbon atoms. The drilling oil may be topped crude oil or formation oil that has had most of the hydrocarbons with one carbon atom through six carbon atoms removed. Fuel oil may have been added to the topped oil.

Abstract: An ultrasonic anemometer wherein there is a fixed supporting framework, transmitter-receiver piezoelectric transducers spaced a predetermined distance apart and making known angles between them, a generator of ultrasonic waves to excite said transmitters, each receiver being connected to an impedance matching circuit, a phasemeter and display means, the phasemeters relating to the various receivers being connected to a computer.

Abstract: A clinical thermometer device includes a body with means for reading out temperature electrically or electronically and a probe body supporting a pair of thermo-couple wires which are thin and of themselves not self-supporting, with the thermo-couple junction exposed at an end of the probe body. The probe is oriented with respect to a plug receptacle to establish correct polarity, or wires on the probe and contacts in the plug establish correct polarity regardless of orientation.

Abstract: The problem encountered with filling sample bottles with the aid of a known device, that dangerous liquids can only be manipulated by using a branch line to a closed casing, has according to the invention be solved by placing an injection needle within a cap which is fixedly connected to the process portion and has an internal surface which corresponds with the external surface of the sample bottle, which cap preferably also has a slot so that a worker can see to which extent the bottle is filled.

Abstract: Apparatus for inspecting bottles to determine if the bottle opening is properly aligned with its base whereby the bottle can be safely handled in automatic processing equipment. The apparatus includes a horizontal platform for positioning a bottle thereupon in an upright position, a frame mounted over the platform, a pair of carriages slidably suspended from the frame so as to move along independent paths of travel that are parallel with the horizontal platform but angularly offset in reference to each other, a probe supported in one of the carriages that is receivable in the bottle opening in contact with the inner wall thereof and means to detect the displacement between carriages as the bottle is rotated upon the platform.

Abstract: A real-time display device or fast imager for ultrasonic echography comprises a first electroacoustic transducer array 2 for periodically and simultaneously emitting a multiplicity of parallel ultrasonic wave trains toward a body O to be examined and receives from it reflected ultrasonic wave trains which it converts into electrical echo signals. These signals are transmitted through respective amplifiers 4 to a second electroacoustic transducer array 3 or 30 which retransmits them in the form of regenerated ultrasonic waves to an acousto-optical converter including a transparent tank 5 which contains a piezo-optical liquid 6, serving as an acousto-optical interaction medium, wherein the regenerated waves are focused by one or two focalizing elements, i.e. acoustic lenses and/or mirrors or simply by an arcuate shape of the second transducer array 30.

Abstract: A diagnostic method and apparatus for ultrasound imaging utilizes Rayleigh backscatter of ultrasound waves directed to an object for creating an image of the object. The apparatus includes an ultrasonic generator for generating a pair of waves of slightly different frequencies which are directed through the object and, after their individual detection upon return from the interior of the object, the two signals representing the two frequencies are differentially amplified in order to emphasize the scattered waves returned from various regions of the object and minimize specular reflections, thereby characterizing the acoustical scattering properties of the interior of the object based upon regional scattering properties.

Abstract: A system and method for performing ultrasonic inspection of a length of test material with ultrasonic transducing means emitting a beam of ultrasonic energy from within sealed wheel means containing a coupling fluid therein and having a flexible cylindrical surface member transparent to the ultrasonic beam and arranged for rolling contact along the test material. The system and method are characterized by spaced leading and trailing wheel means arranged for rolling contact along the length of test material. Ultrasonic transducer means in each of the leading and trailing wheel means are oriented so that a beam of ultrasonic energy emitted from the transducer means in one wheel means will enter the test material, be reflected from the bottom surface thereof, and be directed to and received by the transducer mean in the other wheel means.

Abstract: A pressure monitoring system especially suitable for use with extra-corporeal circulation systems such as dialyzers, blood cell separators, oxygenators and the like, in which the internal system pressure must be monitored at one or more locations in the blood circuit, and appropriate warnings provided of pressure increases or decreases within defined limits. An initial pressure measuring cycle is provided and must be completed successfully before the main operating cycle of the overall system can begin. A pressure transducer provides signals to a digital closed-loop system which provides a suitable compensation during the initial or primary cycle and then holds that compensation value during the machine running cycle. Excursions of pressure beyond upper and lower limits of the stored reference or compensation value, in either direction, will cause the running cycle to terminate automatically.

Abstract: A pressure pickup for measuring the pressure in the intake manifold of an internal combustion engine. The pressure pickup comprises a part, movable in response to the manifold pressure, to which is coupled means for short-circuiting the magnetic flux lines of an electromagnet so that the change in flux lines is detected by the electromagnetic coil and measured by an induction evaluation circuit and thus indirectly measuring the manifold pressure.

Abstract: Improved bridge circuits are described for offsetting span errors, for making scale adjustments and for providing for a non-linear output.

Abstract: The invention contemplates an improved traction-drive transmission of the variety in which plural planet wheels are radially displaceable in orbital motion about an axially opposed pair of axially shiftable sun wheels and within an axially opposed pair of rotationally fixed reaction rings, said planet wheels having constant angular-contact with the wheels and rings of both pairs. An axially fixed pivotal reference between the sun wheels is used for linked connection of the sun wheels such that displacement of the respective sun wheels is always equal in magnitude but in opposite axial directions with respect to the axially fixed reference, thus assuring that the instantaneous radius of planet-wheel orbit between the sun wheel and reaction ring on one axial side of the fixed reference will at all times match the instantaneous radius of planet-wheel orbit between the sun wheel and reaction ring on the other axial side of the fixed reference.

Abstract: A power driven transmission assembly for an internal combustion engine, which assembly includes an endless V-belt that extends between a driving and a driven pulley. The driven pulley is subject to varying loads. The driving and driven pulleys each include first half portions which are transversely movable relative to the second half portions. By concurrently moving the second half portions relative to the first half portions, the effective pitch diameters of the driving and driven pulleys relative to the belt is varied for the transmission assembly to automatically deliver rotational power that in magnitude is related to a desired degree to the torque curve or torque capability of the prime mover with which the invention is associated. The effective pitch diameter ratio of the pulley system is changed by varying the pitch diameter of the driving pulley by power means.

Abstract: A chain drive includes a sprocket rotatable in a plane and comprising an even number of wide and narrow tapered teeth and a flexible chain comprising successive links having alternate wide and narrow tooth-engaging link openings, with tooth width and link-opening width being measured in a direction transverse to the plane of sprocket rotation. The arrangement ensures proper registration and engagement of the link opening of each oncoming link with a tooth of appropriate width despite displacement of the oncoming chain flight from the plane of sprocket rotation and thereby prevents disengagement of a loose chain from the sprocket or breakage of a tight chain by the sprocket.

Abstract: A gear wheel having a rim with a plurality of teeth around the periphery thereof, a hub within the rim, spokes connected between the rim and the hub, sound absorbing material filling the spaces between the spokes for silencing the noise caused by vibration of the gear wheel, and side plates attached to the rim, hub and spokes and completely covering the openings from the spaces between the spokes for confining the sound absorbing material in the spaces.

Abstract: A transmission having four forward gearsets and reverse gearing on one side of the forward gearsets. First and second shift members are mounted on the other side of the forward gearing for axial shifting movement to selectively engage the forward gearsets. A shift shaft having a shift lever is mounted transversely of the forward gearsets for axial selecting movement and rotary shifting movement. A reverse shift member is centrally pivotally mounted on the shift shaft, engages a guide to prevent axial movement, and has one end adjacent the other shift members and the other end shifting the reverse gearing.

Abstract: An automatic change-gear control device for use in an electromobile which incorporates a multi-stage change gear drive system. This automatic change gear control device selects and controls a gear ratio for an optimum ratio, depending on the running condition of a vehicle, and particularly provides a change-gear logic by detecting a load torque for every individual condition, in an attempt to improve the running performance of a vehicle at the time of acceleration or at the time of running on an upward slope.

Abstract: A universal tool includes a body with an opening adapted to interchangeably receive cassette-type work elements. Connected to the body is a handle containing clamping means for securing the work piece within the surfaces of the working elements of the cassette and a screw unit which preliminarily orients the working surfaces of the cassette elements in relation to the diameter or size of the work piece. The various cassettes can contain a screw driver, reamers, wrench, pipe flare, thread cutters and other functional working surfaces or jaws.

Abstract: A straight line shearing mechanism which includes a unique pneumatic control system to cause the operation of the shears. One feature involves the cushioning of the piston member of the pneumatic cylinder assembly on the return stroke. Another feature is the provision of an automatic retract to open the shears in the event that the shear blades do not complete their cutting stroke. Also, one blade of a set of shear blades may tilt in the event of excess tension between the blades. Additionally, one shear blade is pivotally adjustable about a pin member having an axis extending in the direction of travel of the blades. Further, the drop guides are horizontally adjustable relative to its associated shear blade in the direction of travel of the shear blade and also adjustable about a vertical axis.

Abstract: A punch and retainer assembly wherein the punch has a flattened surface at the upper end of the side wall thereof and a radially inwardly extending recess directly below the flattened side wall portion. The punch retainer includes a vertically movable latch adapted to engage within the recess on the shank of the punch and retain the punch within the retainer block. Means are provided for limiting vertical movement of the latch so that the punch can be inserted into the retainer only when the flattened surface thereof is aligned parallel with the pivot axis of the latch.

Abstract: An electronic musical instrument which has a key assignor or assignors of one or more channels for generating and temporarily storing key code corresponding to key depression and release, respectively, a memory for storing waveshape information such as inclination and amplitude variations of a required musical waveshape divided into a plurality of periods so as to read out the waveshape information corresponding to the key code, a plurality of tone source devices, each including waveshape generators of different sound ranges respectively corresponding to keyboard switches in the same channel of each key assignor, the tone source device reading out the waveshape information from the memory on a time divided basis to generate from the waveshape generators waveshapes of different frequencies based on the read out waveshape information, and means for simultaneously actuating the corresponding waveshape generators by the key code from the key assignor and coupler information.

Abstract: An envelope generator for use in an electronic instrument generates an envelope waveshape control voltage having separate attack, first decay and second decay sections. The control voltage representing each waveshape section is derived from a separate voltage divider network. The divider networks are connected in series, with separate voltages supplied to the ends and junctions thereof. These supplied voltages correspond to the initial, attack, sustain and final voltage levels of the generated control voltage. The output nodes of the separate divider networks are accessed at different clock rates.A scanning circuit sequentially enables consecutive pairs of gates associated with each divided voltage output node. These gates alternately are connected to separate first and second output lines which provide divided voltages from adjacent gate pairs to opposite ends of an interpolation circuit. This circuit interpolates the provided voltages to derive the envelope waveshape control voltage.

Abstract: A keyboard type electronic musical instrument which is provided with a keyboard having an arrangement of keys corresponding to an arrangement of letter names based on the scale of the equal temperament of 12 degrees, a sound signal generator for generating sound signals of frequencies defined for the letter names, first and second gate circuit means having gate circuits respectively supplied with the sound signals from the sound signal generator, a first mixer for mixing the outputs from the gate circuits of the first gate circuit means, a frequency multiplier circuit for frequency multiplying the output from the gate circuits of the second gate circuit means, and a second mixer for mixing the outputs from the frequency multiplier circuit and the first mixer. The sound signals supplied to the gate circuits of the second gate circuit means have higher or lower frequencies than the sound signals supplied to the corresponding gate circuits of the first gate circuit means.

Abstract: There is disclosed a method and apparatus for recording digital signals subsequent re-creation of a musical performance from the keyboard of an electronic player piano, wherein the notes are given a stretched effect before recording so as to eliminate the sharpness and mechanical sounding of such music during the re-creation of the performance.

Abstract: An armored wheeled vehicle is disclosed in which the front wheels are disposed within recessed wheel wells formed in the vehicle hull. The wheel wells are covered by means of spring biased fairing panels, disclosed by plates which are pivotally mounted on the sloping armored front deck of the vehicle hull and biased to a down position extending across the wheel well at the same angle of inclination as the deck surface to afford minimum vulnerability to weapons fire directed at the front area of the vehicle. The pivotal mounting accommodates the excursions of the front wheels created by suspension displacement on a bumpy road surface or cross country terrain contours by the tire contacting the fairing panels and forcing them open against the bias of the springs and being prepositioned upon movement of the wheel back within the wheel well to again present a minimum frontal area, disposed at the same inclination as the hull deck.

Abstract: A gas-sealing device for gas-operated firearms of the tubular-magazine type in which a pair of radially flexible piston-rings are provided for sealing the gases within the annular chamber between the gas cylinder and the magazine tube. Each piston-ring is provided with a gas-impingement surface so disposed that the pressure of the gases in the gas chamber against such impingement surfaces forces one of the rings outward into sealing engagement with the walls of the cylinder and the other inward into sealing engagement with the magazine tube.

Abstract: A pneumatic apparatus for the rotation of a valve rod having a box-design body with a cylindrical seat, on the inner wall of which there is disposed a static resilient gasket, shaped so as to convert the said cylindrical seat to an almost 8-shaped configuration. In this manner, the cylindrical seat is divided into two half-chambers communicating with each other and each of them communicating with the inside, through cross tubular lines.

Abstract: A valve actuator is capable of being mounted on a valve in alignment with a valve stem which can be moved to open and close the valve. The actuator includes a hydraulic cylinder and a piston slidably mounted within the cylinder. A piston rod is joined at a first side of the piston and extends outwardly of the cylinder toward the valve to be joined to the valve stem. A high pressure gas accumulator is mounted on the cylinder and includes a generally spherical shaped pressure wall which is intersected by the cylinder to locate an end of the cylinder within the accumulator to allow communication of the interior of the accumulator with a second side of the piston. Hydraulic oil acting on the first side of the piston opens the valve against high pressure gas within the accumulator and evacuation of the hydraulic oil allows the high pressure gas to act on the second side of the piston to rapidly close the valve.

Abstract: A plastic shopping bag is provided with an integral handle portion of wave configuration having a strip of reinforcement material therein of heavier gauge plastic than the remainder of the bag. The heavier gauge strip extends across the handle portion in spaced relation to the side edges of the bag.

Abstract: An improvement in a carton forming mechanism of the type wherein a mandrel is reciprocated through a die assembly to fold the side walls and tabs of an upwardly open carton assembly having perpendicular pairs of side walls. It is designed specifically for carton blanks having protruding tabs at the ends of both pairs of side walls, so that each side wall is overlapped by a bent tab when the carton is completed. The folding mechanism includes two opposed pairs of folding irons mounted about parallel spaced pivot axes. Each folding iron has an arcuate surface to fold a first carton wall relative to the bottom carton wall. It also includes a radial extension at the outermost edge of the arcuate surface for folding a first tab relative to the first wall. Radial spacing is provided on each folding iron between the arcuate surface and the shaft mounting it.

Abstract: A coffee brewer having a cup-shaped reservoir sized to hold a quantity of water sufficient to fill a cup of desired size. The coffee brewer also includes a coffee receptacle having a size to receive a charge of ground coffee sufficient to make one cup of brewed coffee of maximum desired strength. The reservoir and receptacle are shaped to telescopically receive one another in a snug-like engagement to securely and releasably attach the reservoir to the receptacle. The reservoir is provided with a plurality of apertures which permit the flow of heated water from the reservoir into the receptacle, while the receptacle is provided with a plurality of slits that permit the flow of brewed coffee from the receptacle into the cup in time relation to the flow of heated water from the reservoir into the receptacle. The receptacle includes an integral, radially extending flange that supports the coffee brewer on the upper edges of the cup.

Abstract: A device for use in separating solids and liquids in a mixture whicn includes an annular centrifugal drum having an annular peripheral perforated surface through which juice is adapted to be extracted from a mixture of solids and liquids within the drum by centrifugal force and a deflector means to deflect the juice extracted to a vessel and wherein a second collector means is provided with a portion extending into the drum to collect solid particles after the liquids have been separated from it and to conduct it exteriorly of the drum for collection and wherein a drive motor is provided and suitable belts for rotating the drum.

Abstract: An automatic bale wrapping assembly for a machine that forms round bales of windrowed crop material and includes a mobile main frame with a bale forming assembly operative to continue rotating a completed bale while a wrapping twine is wound thereon, and a pickup mechanism for supplying such material to the bale forming assembly. The bale wrapping assembly has an extendible and retractable elongated twine dispensing arm having a pair of sections longitudinally movable relative to each other from one of which extends a free end section of the wrapping twine. The dispensing arm is pivotally supported on the main frame for movement between an initial bale wrapping position and a final twine cutting position.

Abstract: An apparatus for forming elongated elements such as round bars, pipes and the like into a hexagonal bundle. Tiers containing appropriate numbers of elongated elements are deposited one upon the other in an assembly zone. The assembly zone is defined by a plurality of support surfaces, one of which is stationary, and the remainder of which are adjustable in relation to the stationary support surface in order to gradually impart a hexagonal cross section to the elements accumulating in the assembly zone. The completed assemblage of elements is then externally tied into a bundle in order to substantially retain the aforesaid hexagonal cross section after the bundle is removed from the assembly zone.

Abstract: A system for preventing the free fall of the platen of a vertical molding machine in the event of failure of the connection between the drive rod and the platen. A hydraulic network is employed to enable the movement of the platen. The network employs a counterbalancing circuit to permit raising the rod and platen and for preventing the gravitational fall of the rod and platen. The operation of this hydraulic circuit is controlled by valves which transfer the hydraulic fluid between the two ends of the respective cylinders, and a storage tank (to store the difference in volume between the rod end and cap end of the respective cylinders). With fluid flowing from the cap end of cylinders to the rod end of said cylinders, the platen may descend. With fluid remaining in the cylinders, the piston and platen cannot descend without the fluid being transferred back to the other end of said cylinder by operation of an electrically controlled valving arrangement.

Abstract: An improved cylindrical printing screen having aperatures located such that their geometric centers define an array of equilateral triangles each having one side which defines a 15 degree angle with respect to the circumferential direction, another side which defines a 15 degree angle with respect to the longitudinal direction and a third side which defines a 45 degrees angle with respect to both the circumferential and longitudinal directions of the cylinder is disclosed.

Abstract: A land mine comprises a mine body having at least a ground facing portion with a casing formed of a surface of revolution and having a multiplicity of projectile splinters arranged therearound in a pattern of enveloping tangents, the normals of which point each splinter to a definite target area to be covered. The mine includes an explosive in the casing which is effective upon explosion to catapult the splinters downwardly in a substantially conical distribution each at a predetermined angle depending on the mass of the splinters relative to the mass of the explosive and also depending on the angle of impact of the detonation produced by the explosion on the individual splinters.

Abstract: An inertial impact switch is provided having a housing which comprises two onductive sections electrically insulated from each other and a movable contact member engaging one section and held out of contact with the second section by means of a concentric insulating member. Interior radial "fingers" of the insulator bend in response to the spin forces of the projectile containing the switch. To provide for this sensitivity, the fingers of the insulator may have varying stiffness to provide deflection under differing spin conditions. The body of the switch may also be provided with a single grove bellows that is compressible under applied stress prior to use, moving the first section of the housing closer to the second section of the housing, thus reducing the gap between terminals.

Abstract: A rail-draft vehicle employs an ordinary tractor-like apparatus having conventional forwardly extending, boom apparatus and intermediate vehicle means interposed between the tractor-like apparatus and a conventional railroad car for coupling with and moving one or more of the latter along the rails. The boom apparatus is of the type having a pair of power operated, spaced, swingable tool supporting arms extendable to a position substantially forward of the tractor and have mounted thereon a pair of rail wheels which may be selectively lowered into engagement with the rails upon manipulation of the loader attachment, thereby eliminating the need for special rail wheel retracting mechanisms heretofore directly mounted on the tractor.

Abstract: A working table or desk having a grating for vertical storage of material in elongated form, such as rolled blueprints. The table has a vertically directed opening with grating forming rods extending thereacross to form spaces for inserting rolled documents for storage. A container is positioned below the opening on the floor to receive the lower ends of the material. The opening has vertical surfaces having spaced horizontally directed holes therein. Each hole on each surface is in alignment with an opposite hole in an opposite surface to receive the rods forming the grating. One of each pair of oppositely aligned holes is deeper than the other to receive a coil spring. Each rod is inserted into a deeper hole to be in abutment with the spring, the spring being compressed to permit the entry of the rod across the opening and when so compressed the other end of the rod is within the opening and in position to be forced into the opposite hole by the bias of the spring. The spring thus holds each rod in place.