Abstract: The several machine functions required to feed, cut, and insert insulating wedges into armature slots are accomplished with the use of a single drive motor that drives a control cam and a Scotch yoke mechanism. The machine is of simple construction and capable of high speed operation. By minor modification, the same machine can be used for feeding, cutting and inserting armature cell insulating liners.The machine includes an improved armature index mechanism especially adapted for high speed indexing in which the index pawl enters succeeding armature slots while traveling at zero velocity in the direction of its indexing movement.

Abstract: In one embodiment, a relatively thin layer of polysilicon is deposited on an underlying region to which spaced-apart electrical contacts are to be made through a subsequently formed relatively thick insulating layer. The polysilicon is selectively masked by a patterned silicon nitride layer in the regions where contact windows are to be formed. The unmasked polysilicon is then converted to a relatively thick insulating layer in an oxidizing step. Thereafter the silicon nitride portions are removed and the remaining polysilicon is utilized to provide conductive regions in the defined windows. In another embodiment, a relatively thick layer of polysilicon is selectively masked and partially converted to silicon dioxide to define both the insulating layer and the conductive regions. In still another embodiment, a relatively thin layer of polysilicon is patterned and then entirely converted to silicon dioxide to form an insulating layer having windows defined therein.

Abstract: The ultra-miniaturized, active solid-state devices and circuitries have unique material bodies having signal-translating regions attached thereto for active signal translation. These regions, comprising melt-grown, or simulated melt-grown, metallurgical compounds including oxides, eutectics, and intermetallics, are of controlled compositions, concentration profiles, and electronic or other optoelectromagnetic properties. In some devices, the microstructure of the compounds comprises a plurality of microscopically thin, regularly-shaped and uniformly-spaced bodies of one phase material dispersed in a matrix of another phase material. The electronic conductivity of the bodies is substantially different from that of the matrix, and the bodies all terminate at microscopic distance from the pn junction (or other interfacial rectifying barrier region), so as to confine the signal current carriers to flow mainly in only one of the phases. This achieves carriers microstreaming or microbranching effects.

Abstract: A process for the manufacture of a light energy converter involves forming of a plurality of photovoltaic sources wherein first bodies of a first conductivity type semiconductor material each has a surface layer of a second conductivity type material and second bodies of said second conductivity type semiconductor material each has a surface layer of said first conductivity type material. The first and second bodies are intermingled in a one level layer in an insulating support. A conductive layer is applied to interconnect the first conductivity type material of all said first bodies with the second conductivity type material of all said second bodies. An electrolyte may wet such sources where, upon exposure to light, the sources cause a current to flow in the electrolyte producing an electrochemical reaction.

Abstract: A method of mounting a potentiometer (pot) on a plate, wherein a hollow cylindrical housing appendage of the pot is positioned through a hole in the plate to the other side thereof. The rotatable shaft of the pot then projects to the said other plate side through the appendage. A washer, a jam nut and a seal nut are positioned around the appendage. A compound is then potted in contact with and around the pot housing sealing it to the plate, and around the shaft. The housing on its side of the plate is larger than the hole. However, the shaft is not primed and is therefore rotatable after potting. The plate is primed on both sides prior to potting.

Abstract: An enclosure for an electrochemical device, especially useful for electrochemical cells having an internal pressure above ambient, wherein the enclosure is formed in accordance with techniques based upon aerosol container filling procedures.

Abstract: A method for producing a light conductor structure having a pair of light conductors embedded in a substrate of an electro-optical material and having an electrode arranged between the light conductors, which structure is particularly adapted to be used as an electrically controllable coupler, characterized by providing a substrate, applying electrodes to the desired surface area of the substrate, and then producing the light conductors by doping the substrate utilizing the electrodes as a doping mask.

Abstract: Apparatus and method for fabricating a multi-wire harness assembly are disclosed. The harness consists of a multi-contact electrical connector with a plurality of wires of diverse lengths attached thereto. The free ends of the wires have been differentially stripped for the application of electrical terminals. The fabrication apparatus consists of spaced wire insertion and stripping stations. Wire lengthening blades, located between the wire insertion and stripping stations, pull wires through wire stripping blades to differentially remove the insulation from one end.

Abstract: An apparatus and method for butt splicing a pair of insulated electrical conductors by crimping an open-sided sleeve thereon. The apparatus comprises a frame, a wire cutter, a pair of laterally acting crimping jaws, a wire tensioning assembly, a sleeve feed assembly, a sleeve ejector, and a power cylinder, all of which are operably interconnected for sequential splicing operation. A connector sleeve is initially severed from a continuous chain thereof and is automatically positioned in each of the crimping jaw sets by the sleeve feed assembly. A pair of matching wires is then selected and pulled taut in a side-by-side manner, between the opposing side walls of each of the sleeves.

Abstract: An interconnector for installation in an opening in a wall to provide at least one electrical connection through said wall, and a method for making same. The interconnector comprises a one piece tubular metal shell, at least one conductor within said shell, and two spaced apart glass sealing members supporting said conductors within said shell. The shell includes at least one port allowing access to the space interior of said shell and between said sealing members. The method for making the interconnector includes the steps of supporting one of the sealing members with a layer of inert flowable material, and subsequently removing the material through the port.

Abstract: The present invention relates to current sources and, in particular, to a method for sealing current sources, preferably of a cylindrical shape, with an alkali electrolyte and to devices for carrying same into effect.The method can be realized by a device, comprising a rolling die, a hold-down member adapted to position the plane of the cell cover end face perpendicular to the cell axis and to press said cover towards the cell's central support, a footstep for positioning said cell support during sealing. According to the invention, said footstep is made as a cylindrical socket with a ring projection, or has a shape similar to that of the supporting part of the cell being rolled. The rolling die comprises at least one cone-shaped section and is provided with a stop adapted to limit the motion of the hold-down member into the die.

Abstract: The present invention relates to portable, semiautomatic apparatus for aligning and removing solid state multicontact electrical circuit devices, e.g. DIP (dual-in-line package) chips from printed circuit panels or boards so as to prepare the board for new or replacement chip insertion and soldering.

Abstract: A three-position pneumatic tool having a toggle trigger for actuating a control rod which in turn controls a pair of pneumatic check-valves. Three interconnected, tandemly arranged piston assemblies are operatively associated with an air pressure source at one end while also being operatively associated with a work assembly at the other end. The trigger is spring-biased to a location wherein the tool is in a neutral workpiece engaging position. Actuation of the trigger in one direction will open one of the pneumatic valves whereupon air pressure acts upon the upper surface of one of the pistons so as to lower or retract the tool to a workpiece insertion position. Release of the trigger permits the tool to attain the workpiece engaged or neutral position. Rotation of the trigger in the opposite direction permits the other pneumatic valve to open whereupon air pressure acts upon the lower surfaces of all the pistons so as to raise and actuate the tool to the operating position.

Abstract: A vegetation cutter and method employing a revolving flexible non-metallic line as a cutting member is provided with means for mechanically feeding out additional line to replace lengths broken during operation of the cutter. A rotatable spool is provided for storing extra line in a coiled configuration, with the unwound portion being extended from the rotatable head of the cutter to an exit aperture at its periphery. A control mechanism provides for moving angularly the spool an incremental distance within the rotating head to feed out an increment of line only when desired. Means secure the spool in the head to prevent inadvertent unreeling of cutting line.

Abstract: A frankfurter coring apparatus for coring the center out of a frankfurter is provided with a handle connected to an annular cutting blade and to a straight edge cutting blade. A pair of frankfurter guides guide a frankfurter to the annular cutting blade centered thereon, while the straight edge cutting blade cuts an incision through the frankfurter to the annular cutting blade. The frankfurter core and cored frankfurter are guided on both sides of the blades.

Abstract: A sealable edged aperture is produced in a can top by a generally triangular shaped cutting element which severs a flap-like portion from the can top. The cutting element also includes a wedging structure for folding a portion of the severed flap into abutting relationship with the underside of the can top to provide a discrete seal edge on the aperture. The cutting element is carried on a lever arm which is pivotally attached to a manually grippable element positioned adjacent the can sidewall. A bridging element is also provided at the pivot point to support the opener in the can.

Abstract: An Adjustable Dental Bridge Firing Stand that is adjustable to hold all sizes, shapes and types of dental bridge frameworks; which need to be moved, placed in and held in a dental porcelain oven, or to be held during the various stages of firing the applied porcelain to complete a finished dental bridge.

Abstract: A hydraulic-pneumatic control device characterized by a narrow elongated supply strip having a plurality of channels extending parallel to a longitudinal axis of the strip, a plurality of separate groups of openings spaced along the strip with each group having an opening in communication with each channel, a connecting block having a plurality of separate passages mounted on the strip with the passages in communication with the channels and a control block for each of the dental apparatuses whose agents are being regulated. Each of the control blocks is mounted on the separate group of openings of the supply strip for receiving agents from the channels therein and each block has pneumatically actuated valves for regulating the flow of the agent therethrough.

Abstract: The present invention relates to a wheel for measuring distance for a ski, comprising drive means mounted for rotation at one end of an arm, the other end of this arm being mounted pivotally on an axle parallel to the axis of rotation of the wheel and carried by a first portion of a bracket; this first portion being connected to a second portion adapted to be fixed on the rear end of a ski in such a manner that the axis of rotation of the wheel will be perpendicular to the longitudinal axis of said ski; the wheel drives a counter and the arm is subjected to the action of a spring tending to pivot it about its axis so as to apply the wheel to the ground.

Abstract: A kit is provided for the fabrication of a custom fit garment. The outline of the individual patterns for the pieces forming the garment are preprinted in spaced relation on one or more lengths of fabric. In turn the pieces form a finished garment when joined according to the instructions provided. The patterns are sized for nominal dimensions with alterations capable of being made in the length and width of the garment by adding or subtracting as much as two inches at each seam. The alterations are preplanned by comparing actual measurements of the wearer with the known finished dimensions of a nominal size garment and properly adjusting the dimensions accordingly. Surplus material provided allows repair of the finished garment or the addition of accessories. This custom fit alteration method can also be applied to the common paper pattern style of garment making.

Abstract: An engraving machine is disclosed for engraving articles in a manner which automatically causes relative rotation between an engraving tool and the article support means as a function of the width of a digit (letter of alphabet or numeral) to be engraved so that digits may be engraved on the article with uniform space between digits regardless of the width of the digit.

Abstract: Apparatus for gauging the thickness of moving laminar material comprising a gauging nip defined by a first roller of rigid material disposed on a fixed axis and a second roller biassed towards the first roller, the periphery of the second roller being rigid and adapted for movement away from the first roller, means for conveying the material through the nip and proximity detector means radially spaced from the periphery of the second roller and so positioned that the space formed therebetween is reduced upon the passage of material through the nip, the detector means being adapted to generate a material-thickness-indicative signal proportional to the displacement of the periphery of the second roller.

Abstract: The checking fixture includes a pair of opposed gaging fingers drivingly interengaged so as to be moved together to engage a workpiece, with a simplified arrangement for manipulating the position of both the gaging fingers with a single control knob, insuring a uniformly applied gaging pressure for urging the gaging fingers into contact with the workpiece while compensating for eccentric location of the workpiece in the gage. Rotation of a control knob assembly in one direction causes opening of the upper and lower gaging fingers, the assembly allowing a "stay-open" positioning of the gaging fingers in any adjusted open position.

Abstract: The present invention relates to a hole gauge for measuring the inner diameter of a hole, which gauge comprises an axially movable spindle; a pair of tapered surfaces movable together with said spindle; a pair of contact points radially movable with respect to said spindle, guided by said pair of tapered surfaces; and a support arm for said pair of contact points, the outer surfaces of said contact points and said support arm being movable in parallel radially of said spindle.

Abstract: An adapter for a pin-anvil micrometer, such as used to measure wall thicknesses of small tubing. The jaws of pin micrometers can normally hold a pin of 1/16" minimum diameter while flexing approximately 0.001" and can therefore be used to measure, for example, wall thicknesses of tubing having a 1/16" diameter bore. The range adapter is an anvil extender that snugly fits over the micrometer jaws and extends the effective jaw length to near the spindle center line. Anvil pins of approximately 0.015" may then be used without flexing and the micrometer can then accurately measure distances from 1/64" holes or slots.

Abstract: A probe for measuring coordinate positions on an object by sensing a displacement of the stylus which contacts the object. The probe is responsive to forces which result from the contact between the object and the stylus to indicate coordinate positions of the object. The probe includes a replaceable stylus having a shank portion defining an axis, with a transversely-extending portion extending from the shank portion for sensing forces exerted by objects in the axial direction away from the probe, while the stylus shank portion is responsive to forces in the radial and axial (toward the probe) directions. The probe is thus responsive to forces exerted on the stylus in any direction.

Abstract: A parallelizing gauge in a wedge error correction head for the parallel adjustment of a substrate plate to the plane of a light exposing mask, with a means being provided for introducing and removing substrate plates and masks into and/or out of the intermediate space between the light source and the substrate support. At least three foil segments are provided, each being distributed over the circumference of the wedge error correction head and extending radially inwardly, and each being controllably movable in a radial direction.

Abstract: An adjustable buttonhole sewing guide includes a template preferably in the form of a thin, flexible fabric having rectangular holes therethrough for guiding a seamstress in sewing buttonholes in garments. The holes are in predetermined sizes, orientation, and spacing. Portions of the guide also have appropriately shaped corresponding guide edges which can be separated from the template and used as overlays on the template to adjust the size of the holes for sewing buttonholes of desired size. The template and overlay can be temporarily attached together to maintain the desired size of the holes in the guide and placed upon the fabric onto which the buttonholes are to be sewn.

Abstract: A sighting device is provided for a bow in which a sight is supported on a mount and the mount is mounted on a toothed rack. The mount has a worm gear thereon which meshes with the teeth of the rack to allow vertical adjustment of the mount and thus the sight with respect to the rack in order to adjust for altitude. The rack includes a standard scale thereon and a space for individualized markings of altitude gradations. Preferably, the rack is attached to a horizontal support having a slot extending therein. A bolt fits through the slot in the horizontal support and is screwed to a cradle secured to the bow in order to mount the sighting device on the bow.

Abstract: An adjustable crosshair sight for archery bows comprises a frame in which a plurlity of horizontal wires are mounted in parallel spaced relation such that the vertical distance between adjacent wires can be varied. A vertical wire is mounted in the frame bisecting the horizontal wires, thereby forming a series of vertically spaced crosshairs within the frame. The horizontal wires provide a series of range references to the archer while the vertical wire provides a windage reference. The frame is movably mounted on the bow such that the crosshairs are in the line of sight of the archer when he is in position to shoot and the horizontal distance between the frame and the bow can be adjusted, thereby varying the distance between the vertical wire and the bow and providing a sideways or windage adjustment in the sight.

Abstract: The specification discloses a paint spray booth adapted to provide radiant heat to an object in preparing the object for painting. The booth chamber includes a structure for housing a vehicle or other objects to be painted with tubing fixed in surface contact with the sides of the structure. A system for circulating a heated fluid, such as water, through the tubes is provided to thereby heat the walls of the structure. The heated fluid is circulated through the tubing being heated by a boiler unit and driven by a standard pump acting in conjunction with a thermostat and the boiler. The tubing in the walls is insulated to direct radiant heat into the structure whereby the object to be painted is heated and kept at an optimum drying temperature.

Abstract: A boot drying apparatus utilizes a hollow plenum chamber having a lowermost open mouth portion for resting upon a hot air discharge grill disposed in the surface of a floor of a room. The chamber supports a number of upright extending tubes, each having a snout-like portion pointed in one direction. Each of the tubes has a plurality of openings disposed along the length thereof as well as an additional opening being located at the end of the snout. A rod is carried by such that the rod is slidably affixed to the tube having the uppermost end thereof extending outwardly from the tube and having the lowermost end thereof formed into a lowermost leg of an L-shaped portion of the rod to which a plate is affixed. The plate is slidably located adjacent an opening in the plenum chamber as are a plurality of curved plates located and affixed to the rod adjacent the vertical leg portion thereof within the length of the tube.

Abstract: A tobacco bulk curing barn construction including a furnace section and a plurality of portable barn sections each having imperforate side walls and top wall that form substantially complete exterior walls and roof of an integral transverse section of a composite curing part of the barn construction. Flanges and sealing gaskets are provided along edges of each section to provide sealing engagement of adjacent sections in a series row formation. A screen is secured across one end of the barn section to define with the side walls a full section open curing space for receiving tobacco filled in bulk therein when the section is disposed flat on the screened end. A pair of open frames is mounted between the side walls for movement from open positions after an initial amount of tobacco has been filled into position on top of the leaves to limit the amount of compression which can subsequently be applied to the initial tobacco by virture of the subsequent full loading of leaves into the curing space.

Abstract: An apparatus for providing an adjustable aperture used in the practice of simulated artifical intraocular lens insertion comprising; a flexible diaphragm with a circular aperture therethrough, a cylindrical diaphragm mount for supporting the diaphragm, a diaphragm control member within the mount, and means for moving the control member against the diaphragm, thereby stretching the diaphragm and expanding the size of the circular diaphragm aperture. The size of the aperture is increased or reduced in order to simulate the pupil of the eye in various stages of dilation. The flexible diaphragm member is used to simulate the iris, so that an artificial intraocular lens may be inserted through the circular aperture and mounted on the flexible diaphragm member, thereby simulating the mounting of such a lens to the iris of the human eye.

Abstract: In a preferred embodiment a fire control combat simulator contains a real time record of stabilization error experienced by the line-of-sight of the fire control combat system being simulated such as a stablized gun on the hull of a tank. A number of methods of making a real time record of stabilization error are disclosed.

Abstract: Improved footwear comprising a flexible cover component for a human foot including a sole portion, an upper portion integrally related with the sole portion including a toe section for defining a cavity adapted to receive a human foot, a pair of side sections extended rearwardly from the toe section, a heel tab integrally related to the rearward section of the sole portion and extended upwardly therefrom for confining the heel of the foot, and a flexible binder component for securing the cover component about the foot including a strap united with the heel tab and adapted to be united with the toe section employing Velcro fasteners and the like.

Abstract: A shovel tooth for an earth-moving shovel includes a tooth holder having a hollow shell-like portion fixedly attached to the inner surface of a shovel blade, the shell having an end web extending along the edge of the blade and a projecting portion attached to the end web and extending beyond the blade edge. A tooth cap has a hollow interior dimensioned to receive and frictionally engage the projecting portion, the projecting portion and the tooth cap having aligned opening to receive a fastener such as a bolt. The projecting portion and the interior cavity of the tooth cap are symmetrical about a longitudinal axis of the projecting portion so that the cap can be removed and replaced in either of two positions separated by 180.degree. of cap rotation. The shell and the tooth cap are provided with reinforcing webs which are substantially aligned with each other in the assembled condition. The projecting portion and the cap cavity taper from the end web to the tip of the projecting portion.

Abstract: A quick change frame for pictures comprising frame moldings and corner joints for detachable connection of the latter together. The frame moldings are in the form of hollow rails with at least one opening arranged on each side in a frame molding side wall enclosing the cavity. The corner joints comprise angle pieces with the shape and size of the cross-section of angle arms corresponding to the frame moldings. On the angle arms there is at least one male detent part extending out of a plane of these arms. When the angle arm has been inserted into the cavity of the respective hollow rail the male detent part releasably snaps into the respective opening provided in the side wall.

Abstract: Two sheet elements are secured together along selected lines to form a pocket to adaptable to receive a document for machine processing.

Abstract: A readout cassette comprises a preferably two-part plastic casing in which two coil shafts are rotatably mounted. The coil shafts serve to receive a thin paper web or the like printed on at least one side. The web is unwrappable manually by means of a rotary knob or through the intermediary of an electric drive from one coil shaft to the other and vice versa in opposite directions behind two readout panels. The readout panels consist of a highly transparent plastic material and cover viewing apertures provided on the front and rear sides of the casing.

Abstract: A manually adjustable indicating device such as a wall or desk calendar, a price board or the like includes a housing structure having a central flat base plate with overturned side edges defining a storage cavity on each side of the base plate together with support plate means slidable into the housing structure between a pair of spaced guides formed along the side edges of the flat base plate and a plurality of spaced apart flanged ribs formed on the support plate so as to receive the edges of a self-coiling tape and thereby to hold that portion of the tape which is adjacent the support plate means in flat face contacting relation therewith and so as to allow the coiled ends of each tape to occupy the storage cavities on each side of the base plate, each tape having visually observable indicia thereon which may be changed by simple manual finger touch whereby the portion of the tape which is exposed is moved and whereby one end of the tape is uncoiled and the other end is coiled.

Abstract: An overhead sign having polyhedral sections tapered vertically in opposite directions, the lower section comprising downwardly converging translucent panels having picture transparencies backlighted by concentrated light from overhead fluorescent room lights while upwardly converging decorative opaque panels overhang the upper edges of the translucent panels to minimize front lighting and perceptively brighten the pictures viewed by customers as well as minimizing shadows on the display counters below the sign.

Abstract: The invention provides a safety device for firearms wherein a key operated lock actuates a locking pin to lock the firing mechanism. The locking pin is controlled by a rack and pinion gearing linkage which moves the locking pin to alternately engage or disengage a trigger seat.

Abstract: A metallic cartridge plug corresponding in dimensions to cartridges used in a firearm and having a screw disposed through an opening in its closed end is insertable within the firing chamber of the firearm and is free to rotate therein about its longitudinal axis. The threaded end of a telescoping rod is inserted through the barrel of the firearm and threaded into the screw disposed on the cartridge plug. A cap having a diameter substantially in excess of the bore diameter of the firearm is affixed to the outer end of the telescoping rod, such that the telescoping rod can be telescoped to bring the cap flush against the muzzle end of the barrel. The telescoping rod can not be unthreaded from the cartridge plug without simultaneously pulling and turning the cap affixed to the telescoping rod.

Abstract: A device for "setting" a hook in the mouth of a fish when the fish pulls at the bait on the hook, the invention is attached to spaced ends of a fishing line between the user and the hook. The present device comprises a shaft member which carries a tension spring along its length and which has a trip arm pivotally attached to its lower end. The tension spring releasably engages the trip arm along its length and holds the trip arm under tension at right angles to the shaft member. A relatively short length of fishing line is tied to a lower portion of the tension spring and is threaded through the trip arm. A relatively long length of fishing line is tied to the upper end of the shaft member and extends to a fishing pole or rod or a trotline. A fish pulling on a baited hook tied to the free end of the relatively short length of fishing line causes the trip arm to be pulled into alignment with the shaft member, thereby releasing the tensioned spring from engagement with the trip arm.

Abstract: A cover for a fishing line holding reel has a receptacle arrangeable around the handle of a fishing pole on which the reel is mounted so as to cover the reel as well as the handle of the pole. The receptacle is retained on the handle of the pole by a fastener formed from a flexible, elastic element slidably mounted on the receptacle so as to close-up an opening of the receptacle, with the element being looped through itself and terminating in a hook which removably engages an eye of the pole in order to hold the receptacle on the handle of the pole.

Abstract: A fishing lure intended primarily for luring game fish comprises a simulated worm having the leading portion of the shank of a fishhook passing therethrough, the trailing portion of the fishhook being adapted for engaging the simulated worm, Texas style, and having a thin, bendable vane member secured to the shank of the fishhook with the outer surface of the vane member having a white, resilient coating, the inner surface of the vane member being shiny, and the leading end of the vane member having a pointed shape.

Abstract: An instructive amusement device for young children that embodies the concept of a puzzle for enhancing the child's intellectual and motor skills by requiring correct assembly of puzzle pieces, and also to stimulate learning about wheeled vehicles that the child can be expected to see in the world around him. The device includes a wheeled wagon on which is supported a vertically oriented rectangular frame having a pocket for receiving and retaining in edgewise juxtaposition a plurality of puzzle pieces each in the form of a flat elongated strip having a length substantially equal to the length dimension of the frame. The puzzle pieces each have fragmentary pictorial representations on each of its two flat surfaces which, when the puzzle pieces are juxtaposed edgewise in the frame in correct order and with correct longitudinal orientation, create on the two opposite surfaces of the assembled puzzle pieces complete pictorial representations of two different views of the body portion of a wheeled vehicle.

Abstract: A poseable figure simulating a human-being comprises a body whose lower end is open to receive a leg assembly articulated for movement relative to the body fore and aft, side-to-side and also about the axis of a longitudinal stem which carries the head and makes snap fitting engagement with the leg assembly. A resilient bias acts between the body and leg assembly both to take up clearances and to provide a degree of frictional restraint to hold the parts in desired relative positions.

Abstract: An assembly kit has a plate element having an undercut groove which extends from one edge of the plate element and is open at one face of the latter, and a bore communicating with the undercut groove. The assembly kit also includes an axle element having a pin-shaped portion insertable in the bore of the plate element, a holding portion insertable in the undercut groove of the plate element, and a shaft portion. The holding portion of the axle element has a non-circular cross-section mating with the cross-section of the undercut groove of the plate element and is provided with projecting connecting means for connecting the holding portion with another structural element of the kit. The above connecting means may be formed as an undercut projection extending outwardly beyond the one face of the plate element when the axle element is inserted in the latter. A plurality of such undercut grooves and bores may be provided in the plate element.