Abstract: Improved heat transfer surface for nucleate boiling is produced by metallizing a reticulated organic foam layer placed in contact with a tube or other heat transfer surface so as to form a reticulated metal surface layer which is integrally bonded to the heat transfer surface. The metallized foam layer is then at least partially pyrolyzed to form hollow metal strand portions. The boiling surface so produced is then modified to enhance its long term boiling stability by deforming the hollow strand portions to reduce their minimum internal diameter. In one manufacturing process, suitable small solid particles, which may or may not be permitted to remain in the finished product, are worked into the porous surface of the reticulated metal layer after which the layer is compacted so as to cause the particles to deform the hollow metal strand portions and thereby reduce their ability to carry liquid flow which could "flood out" vapor bubbles trapped in the tips of the hollow strands during a boiling operation.

Abstract: A device (10) for compressing a closure assembly (82) and an O-ring (80) within a control rod drive mechanism for a nuclear reactor in order to seal same. The device (10) applies a predetermined compressive force to the closure assembly (82) and O-ring (80) and has incorporated therein an angularly movable sleeve (18) which engages a lock nut (98) and threadably advances same within the control rod drive mechanism so as to engage the closure assembly (82) and apply the predetermined compressive force to assembly (82) and O-ring (80). After depressurization, lock nut (98) retains closure assembly (82) and O-ring (80) within the control rod drive mechanism by a predetermined residual compressive force.

Abstract: A tool is used to move the piston into the cylinder bore of a disc brake caliper housing having a support bracket with an opening disposed opposite the piston. The tool comprises a threaded shaft having a piston engaging member rotatably connected at one end of the shaft. A shaft rotating member is rigidly secured to the other end of the shaft. A brace member threadingly engages the shaft member at a location intermediate the two ends thereof. The brace member has a structural configuration to abut the inside surface of the support bracket of the caliper housing. The brace member also is effective to span the opening to position the shaft member within the opening so that the piston engaging member can be moved directly toward the piston. The piston engaging member is effective to exert a pressure against the opposing edges of the piston when the brace member abuts the inside surface of the support bracket.

Abstract: A tool for pulling a speed reduction unit from a drive shaft includes a puller plate that has outwardly extending flanges adapted to be placed in a groove formed in the internal surface of a tubular mounting sleeve of the reduction unit so that, when a threaded rod is threaded through the plate to extend into the sleeve and the inner end of the rod abuts the end of the drive shaft on which the tubular sleeve is mounted, continued threading of the rod into the mounting sleeve causes the plate to react against the wall of the groove and force the mounting sleeve and the reduction unit carried thereby off the drive shaft.

Abstract: A tensioned helical wire for use as a displacement sensor. The sensor made of high strength piano wire is attached at its ends to two anchors which in turn are attached to or are a part of the object or objects to be tested. In the preferred embodiment the sensor has straight ends which are attached to two small anchor blocks. These blocks are then attached to the test object. The displacement range and sensitivity of the sensor can be controlled by the initial geometry selected. If an initial tension applied is small, the sensor has a very large response range that is about fifty times that of a straight wire sensor. If a large initial tension is applied, the helical shape approaches that of a straight sensor and has a displacement range only a few times that of a straight wire sensor. If the sensor has a large displacement range, the sensitivity is much less than that of a straight wire sensor and if the sensor has a small range the sensitivity is comparable to that of the straight wire sensor.

Abstract: Die insert lock screws are formed for threaded engagement within corresponding threaded holes formed in a retainer having a socket within which a die part insert is positioned, with a portion of each of the screw heads normally overlapping the socket and fitted within a groove in the insert. The screw heads each are provided with a circumferentially elongated notch which can be aligned with the adjacent insert surface portion and retaining socket wall portion for disengaging the screw heads from their grooves for thereby unlocking the insert. Each notch is aligned lengthwise, generally perpendicularly to the socket wall so that maximum face to face area contact is provided between the bases of the screw heads and the retainer when the screw heads are tightened against the retainer for locking the insert.

Abstract: A method for producing stuffing for a spring-type mattress, including the steps of forming grooves on the whole circumference of edge portions of upper and lower mold members, fixing dense and sparse seats on flat surfaces of the upper and lower mold members, respectively, bending whole edge portions of both seats into the grooves, inserting and fixing elastic plates into the grooves, pouring a certain predetermined quantity of an undiluted solution of foaming plastics onto the flat surface of the lower mold member and tight contacting both mold member before forming the undiluted solution, horizontally and symmetrically cutting and dividing the stuffing into two parts, turning over the two parts and assembling them so as to cover a spring assembly thereonto thereby covering the two parts by an outer decorative member as a mattress unit.

Abstract: A method of mounting and dismounting hammers in a hammer mill in which the hammers are supported in rows on carrier bars, in which each such row of hammers is grasped, lifted and held, by means of a gripping and lifting device, in a position in which the carrier bar, on mounting of the hammers, may, in the unloaded state, be inserted in the row of hammers and connected to the rotor of the hammer mill in order thereafter to be loaded with the weight of the hammers. Moreover, on dismounting of the hammers, the carrier bar may, in the unloaded state, be withdrawn from the row of hammers which is thereafter lifted out of the hammer mill.

Abstract: A vacuum sizing apparatus is positioned downstream from an extruder along a path followed by a body of thermoplastics material as the body exudes in a heated, deformable state from the extruder. The apparatus includes structure defining an elongate sizing surface extending along the path of travel of the body. A multiplicity of vacuum channels are formed in the structure and open through the sizing surface for drawing outer wall portions of the body into conforming engagement with the sizing surface as the wall portions cool and rigidify while moving along the sizing surface. The structure includes a plurality of side-by-side structural segments, each of which defines a portion of the sizing surface, adjacent ones of which have mating side walls. The vacuum channels are of small cross section and are formed as grooves milled or ground in the side walls of the segments. A clamping system releasably clamps the segments together and permits their disassembly to provide access to the vacuum channels for cleaning.

Abstract: A method and apparatus is provided whereby a joint can be made on site between two flanged pipe ends by winding a ductile metal strip over the flanged ends so that lateral portions of the strip are deformed radially inwardly behind the flanges to entrap them together. The apparatus takes the form of a frame 10 rotatably supporting an annular member 11 which can be brought coaxially to surround the pipe ends. A ductile metal strip is drawn from a reel 17 on the frame and passes in succession between rollers 15 and the flanged pipe ends, the rollers 15 having a progressively more waisted profile so as to bring the strip progressively to a channel shape enclosing the pipe flanges. As the strip is wound spirally over the pipe ends masking 33 is removed from an adhesive ribbon whereby superimposed turns of the strip are bonded together.

Abstract: A method of making billets, whereby a composite billet is produced by continuous casting or rolling, which billet is star-shaped in cross section and has at least two ray members disposed symmetrically relative to the central longitudinal axis of the composite billet; the base of each star ray member of the composite billet at the place of its juncture with the central portion thereof is selected to be 0.72 to 2.3 of the ray member height, the other base being 0.5 to 1.

Abstract: A clamp is disclosed for use during connection of insulated wires into an electrical connector. The wires are collectively provided by an electrical cable which must be orientated by the clamp to project perpendicular to the connector when all the wires are connected.

Abstract: An automatic tool changer for transferring single tools and/or multiple spindle toolheads between a tool storage magazine and a horizontal spindle of a machine tool. A plurality of single tools and/or toolheads are stored in the tool storage magazine with their shanks in a vertical position. A first tool change arm transfers a selected tool or toolhead from the storage magazine to a tilt unit which tilts the shank of the tool or toolhead by 90.degree. from a vertical to a horizontal position parallel with the axis of the spindle. A second tool change arm removes the tools or toolheads from the tilt unit and spindle simultaneously, interchanges them, and inserts the interchanged tools or toolheads into the spindle and tilt unit. The tilt unit then tilts by 90.degree. back to the vertical position, and the first tool change arm returns the tool or toolhead in the tilt unit back to the tool storage magazine.

Abstract: A method of manufacturing devices in a semiconductor body 20 of a first conductivity type. An oxygen impervious masking medium 22 is placed on the body 20. Portions of the medium 22 are removed to define field areas 31 and field oxide is formed in the field areas. The surface of the silicon wafer 23 is thereafter masked to define gate areas 26 and electrical contact areas 30. The exposed medium is removed and the exposed body areas doped to form interconnect runs 28 and a source/drain region 29 of a second conductivity type. An oxide 48, 50 is formed over the doped interconnect runs and source/drain regions of the wafer. The masking medium covering the contact area 30 is removed and the contact area is doped to a second conductivity type. Finally conductors 60, 61 are positioned to provide the desired electrical connections.

Abstract: Integrated circuits in dice on a wafer are qualified by providing two sets of conductors connected to each die by fusible elements, biasing the dice using said conductors during exposure to a qualifying environment, testing the fusible elements, removing the conductors and testing the circuits. Where the environment is gamma radiation, the fusible elements are tested before annealing of radiation damage and the circuits are tested before and after annealing.

Abstract: Wafers of silicon semiconductor material are stacked, bonded and severed to form a plurality of semiconductor diodes. One or more capacitor bodies are physically and electrically joined with these diodes, either by means of the capacitor bodies themselves or by means of an intermediate lead frame structure, in order to facilitate the handling and processing of the assembly as a unit.

Abstract: A method for forming a gelled anode in which a powdered anode metal is mixed with means for maintaining a uniform mixture of the powdered metal and a gelling agent, the gelling agent is added, and the mixture is fed into an aqueous electrolyte in the cell whereupon a gel is formed in situ.

Abstract: A cut-clinch mechanism of compact structure operates on variably spaced leads of components after their insertion to clinch them directionally at an angle selectable between 90.degree. plus or minus 45.degree. to the line connecting the lead-receiving holes of a circuit board. The leads are clinched in parallel for optimum component stability, and their lengths are adjustable by shims. The movable one of each of two pairs of cutting knives pivots about an axis parallel to the board and has a configuration to wipe the cut lead thereagainst while exerting only small force tending to lift the board. For control purposes the presence of the component lead to be clinched is ascertained by the lead completing a circuit between the cooperating knives; and completion of its clinching by means of the movable knife.

Abstract: A commutator puller for electric motors, alternators, generators and the like has teeth means which hold the commutator while a plunger separates the armature from the commutator. Wire windings soldered to contacts on the commutator may be simultaneously loosened by dipping the commutator, including the winding connections, in a solder bath. While the solder is still molten, the armature is placed in the commutator puller. Power means push the plunger toward the armature. As the plunger moves, a spring associated with the plunger pushes an actuator into a plurality of teeth, forcing the teeth against the commutator to hold it firmly in place. As the plunger continues to move, it pushes the armature away from the commutator. Thus, the commutator contacts are disconnected from the armature windings before the solder hardens. When the power means are disabled, the plunger returns to its original position, relaxing the spring.

Abstract: A shielded cable comprises a flat electrical insulator having a plurality of parallel spaced-apart conductors. A pluraity of openings extend through the insulator to expose at least one conductor. The shield, which is formed from an electrically conductive coating, not only covers the exterior of the insulator but also enters the openings and is electrically connected to the conductor. Gaps are created in the electrically conductive coating so as to provide areas for interconnection by an insulation displacement connector which "mass-terminates" all of the conductors. The exposed one conductor, which is in contact through the openings with the electrically conductive coating, maintains the electrical continuity of the shield notwithstanding the gap formed therein.

Abstract: A connector-cable assembly in which a flat, multiple wire cable is secured in a connector body through a transverse, sharply angled rib, and the stripped wire ends are terminated into a plurality of plate members disposed in parallel planes and spaced longitudinally of the wires to provide mounting and working space. Each wire is terminated by being progressively urged and then forced into an open throated slot formed in one of the plate members. The slots are formed so that there is intimate, large area contact, and wedge resistance to linear pull-out. The plate members are plated for corrosion resistance and a heating step following mechanical connection causes melting or intermetallic diffusion. The rib not only provides strain relief, but also indexes the cable end for assembly and anchors the cable for partial stripping--the latter permitting simultaneous and convenient positioning of the wires.

Abstract: An insulated conductor is terminated in an insulation-opening portion of an electrical contact and the contact jaws are crimped over the conductor to secure the conductor therein. A tool includes a pair of cutting edges and crimping surfaces for cutting and folding over sections of the contact jaws as the tool presses an insulated conductor into an insulation-opening notch formed by the contact jaws. The tool includes a forward end having a surface for engaging and pressing the conductor into the notch, the surface acting against the conductor as a stop to limit the depth of cut of the cutting edges. The tool may also be used after conductor insertion by other techniques to perform the crimping operation. The side surfaces of the tool slidingly engage the cut edges of the contact jaws and prevent an inward movement of the jaws during cutting and crimping.

Abstract: In a safety razor the blade is retained in a manner to permit limited movement relative to the handle in the direction of its longitudinal axis. This is accomplished with blade elements of the type comprising a blade mounted in a cartridge by retaining the blade cartridge in its receptor for movement relative to the receptor. In other embodiments, the receptor is mounted on the handle in a manner to permit limited movement of the handle in the direction of the longitudinal axis of the receptor. The latter embodiment may be employed with any safety razor having its handle positioned in angular relationship to the receptor. To enhance the relative sliding movement, a lubricant may be applied between the moving parts.

Abstract: A shaving system including a handle and a blade assembly, the handle having first and second connecting portions extending from an end thereof, the blade assembly comprising a body portion having blade apparatus permanently fixed therein, a first blade assembly connecting portion pivotally engaged with the first handle connecting portion, and a second blade assembly connecting portion fixedly connected to the second handle connecting portion to facilitate dynamic change of shaving geometry during a shaving operation.

Abstract: A scoring device which produces a plurality of cuts with a single pass comprises a handle and a body portion containing a movable blade holding assembly consisting of a series of razor blades mounted on a shaft with spacer elements between them. By loosening a thumb screw on the shaft the assembly can be released from a retracted noncutting position and slid out from the body portion to expose a greater amount of the blade edge which will produce a deeper cut. The assembly is then locked at the desired extended position with the thumb screw. The blades can be easily and economically replaced to maintain a sharp cutting edge and the device can be used to score fish.

Abstract: A device for determining the annual solar exposure of a site which includes a wide angle viewer and a transparent screen having the paths of the sun at various times of year drawn on it, and with the viewer and screen fixed with respect to each other so that when one looks from north toward south through the viewer the paths of the sun at various times of the year are superimposed on the site being investigated.

Abstract: A tape measure includes a housing having an opening and a measuring tape coiled therein including a free end having a hook member attached thereto. The free end of the tape extends through the opening in the housing and a braking lever is pivotally mounted to the housing with its front end adjacent the opening in position to engage the hook member when the tape is in a retracted position. The front end of the lever is normally biased into engagement with the tape, at the housing opening, by a spring, thereby to prevent movement of the tape. A pivot member for absorbing the shock of impact when the hook member engages the front end of the lever during retraction of the tape includes a pivot pin for pivotally mounting the lever to the housing and a shock absorbing element of a deformable, resilient material adjacent the pivot pin for absorbing the shock.

Abstract: An inside dimension measuring gauge is disclosed having a spindle within a tubular body which actuates a plurality of contact pistons, the measurement being indicated by sensing the displacement of the spindle. A pair of opposed levers pivotally mounted to the tubular body are provided for axially displacing the spindle with respect to the tubular body upon manual application of a compressive force on the pair of levers. The pair of levers are connected to the axial spindle by a pair of movable links and are further provided with screws for regulating the permitted motion of the levers with respect to the tubular body.

Abstract: A probe for use in measuring apparatus has a base member including a two-dimensional seat for an intermediate member which, in turn, includes a two-dimensional seat for a stylus holder. The two seats face in opposite directions so that the stylus holder can be displaced from the seated position in either of two opposite directions.

Abstract: Portable apparatus for use in measuring vertical deviation of the surface of a rail from a reference plane. The measuring device includes a pair of guide beams and a hand-powered carriage which move along the beams. A sensor, which follows undulations resulting from rail wear, is mounted on the carriage and is coupled to the pen of a recorder.

Abstract: A terrestrial magnetism responsive device adapted to be worked using a north or south seeking magnet in both north and south headings, the device including a housing having a north or south seeking magnet therein. The magnet is suspended adjacent one pole by a sensitive spring to permit the magnet to be movable horizontally, when released, from a north pointing position or a south pointing position. Secured and balanced on the seeking or free end of the magnet is a soft iron rod, generally at ninety degrees to the magnet and having substantially the same diameter as the magnet. The rod is balanced along with the magnet so that the magnet and rod together will move horizontally. The housing is rotatable on a plate by which it is held and during operation is fixed on the plate to be moved horizontally in the direction of an area to be explored.

Abstract: Methods are disclosed for externally and conductively heating at least a portion of the sole of a ski boot and for convectively heating substantially the entire inner surface of the ski boot while the ski boot is firmly, but removably, clamped against a flat surface with the flat sole of the ski boot in extensive surface-to-surface contact therewith so as to permit drying of wet boots, warming of cold boots, and/or softening of the molded foam interiors of the boots, to render such boots more comfortable while maintaining the flat sole of the ski boot rigidly clamped in a flat planar condition to prevent warpage thereof. In a preferred form of the invention, methods are disclosed for externally and conductively heating at least a portion of the sole of each of a pair of ski boots removably carried by, and clamped to, a boot and shoe tree and for simultaneously convectively heating the inner surfaces of both ski boots.

Abstract: A control device for footwear, such as an athletic shoe, including a body having a base with relatively flat upper and lower surfaces and a wall extending upwardly around a heel portion to extend along both a medial and lateral portion to an end. The body is formed of plastic to be yieldable, but relatively sturdy for support of the foot in a neutral plane and control roll of the foot during a running cycle.

Abstract: A tap is strapped to the toe of ordinary street shoes for amateur type tap dancing and slipped over the fingers of those confined to wheelchairs for hand tapping. A thin body of hard material has spaced slots thru which a strap is passed which is fastened over the top of the toe of the shoe. The tap body is thinned on one surface between the slots and is thinned outboard of the slots on the other side to accomodate the thickness of the strap. The strap is preferably elastic and coated with a tacky material on the shoe side to retain it in place on the toe of the shoe.

Abstract: A method of removing snow by utilizing a conveyor unit configured to facilitate depositing of snow into a sewer system. The conveyor unit is fit on or within the manhole sewer openings from which the covers have been removed. The conveyor units comprise powered augers mounted within a snow receiving housing having hoppers from which snow is conveyed into the manhole openings. In a first version, the conveyor housing is directly received over the manhole opening, while in a second version, the hopper is offset from the manhole opening and snow is conveyed into the sewer system via a conduit extending from the hopper and into the manhole opening.

Abstract: A snow removal bar for the snow removal plate of a snow removal plow consists of a rubber or plastic element which is reinforced with steel plates on both sides thereof, and which has an upper edge mounted on the lower edge of the snow removal plate with screws. Only the lower area of the rubber or plastic element, which comes into contact with the road, is reinforced by the steel plates and the center area thereabove is reinforced by elastic reinforcements. The reinforcements are embedded in the rubber or plastic element and extend from the upper edge of the plastic or rubber element to the area between the steel plates.

Abstract: The snowblower of the present invention includes a novel housing structure having upwardly extending side cutter bars angling outwardly from the leading sides of the snowblower housing. Beneath the side cutter bars, the lower leading edges of the housing are angled upwardly and provided with pavement protecting skid shoes. The snowblower housing encloses rotatable snow blower fans provided with ice chopper bars which rotate with each fan and cut into the snow. Each snowblower fan is associated with a rotatable discharge spout which is mounted upon a turntable. A novel metallic and plastic bearing assembly is mounted upon the turntable to provide greaseless rotation of the discharge spout, and this bearing assembly is enclosed in a shielding unit to prevent snow and grit from reaching the turntable. All shafts within the snowblower which, through torque or tension, are subject to structural misalignment, are provided with floating oil seals to prevent shaft misalignment from rupturing the oil seal.

Abstract: An ironing mangle for pressing fabric includes a heating member or shoe which transfers heat to a fabric conveyed thereover. The heating member includes a concave surface which forms a substantially semi-cylindrical cut-out section over which the fabric is conveyed and at least one other surface over which the fabric is also conveyed for maximizing the heat transfer from the heating member to the fabric. The concave surface preferably includes two end edges which are arranged so that the angle between the plane connecting the end edges and a vertical plane passing through either of the end edges is in the range of 0.degree. to 30.degree.. The ironing mangle further includes a cylindrical pressing roller for applying pressure to the concave surface, in which the roller is adapted to rotate about its central axis in order to convey the fabric over the concave surface when applying pressure thereagainst.

Abstract: A display and book combination allows for a calendar combination which swings to give access to a phone or reference book. The display is foldable into a flat position for shipping and is easily set up by folding a support panel on a base panel from a flat to an upright position where it supports the book pages and a calendar display panel.

Abstract: A magnetic displaying device adapted for hanging on a wall including a displaying panel made of a hanging panel and a parallel disposed magnetic displaying panel between which is disposed a liquid containing magnetic particles. A translatable erasing magnet is arranged perpendicular to the downward direction of the device and coupled to a magnet lifting mechanism. The erasing magnet rests at either the upper or lower end of the panel and moves up and down through guiding means such as rails. A string or the like coupled to the lifting mechanism is pulled downwardly to move the erasing magnet.

Abstract: A plurality of generally rectangular frames (21) releasably hinged together and having display panels (36) mounted in display areas defined by the frames. Each frame is of tubular metal of rectangular cross section and includes a horizontal top frame member (19), having downturned end portions, and a U-shaped bottom frame member (21), having laterally spaced vertical tubular side frame portions with longitudinal slots. Connector pins (26) make sliding connection between the top frame member and the bottom frame member. Display panels in the display areas are formed with laterally projecting mounting tabs (37) that are received in the slots of the side frame members, and of the connection pins if necessary, to hold the panels in place.

Abstract: A firearm having interchangeable barrels and ammunition cylinders for changing the caliber of ammunition used therewith includes a plurality of ammunition cylinders and a plurality of barrels, each barrel being threadedly mountable on the firearm frame width each barrel including a longitudinal barrel extension for interfering with the mounting and revolution of the ammunition cylinders for ammunition having a larger caliber than that of the respective barrel, and the improvement therein includes alignment marks on the barrels and frame for alignment under the full threaded engagement of each barrel in the frame and forward sights on each of the barrels for cooperation with a rear sight on the frame to allow aiming of the firearm when the barrel is fully engaged in the frame thereby insuring that the weapon will only be used when a barrel is fully threadedly engaged in the frame and therefore that the longitudinal extension thereof will be operative to interfere with any ammunition cylinders intended for larg

Abstract: A support for an automatic weapon includes a sleeve axially coupled to a tubular part of the weapon and including a pair of diametrically opposed lateral wings as well as two folding rods pivotal on the wings. The rods are angularly displaceable from a parallel position to a perpendicular position.

Abstract: A rodent trap guard having a hollow housing receiving a trap, the housing having opposite open ends for rodent access and for trap insertion. The upper side of the housing having a trap viewing opening, the guard being of a strength for substantial protection of the trap from forklift collision.

Abstract: A trick rope toy having a stem (14) which has one end affixed to a continuous loop (12). The other end of stem (14) is affixed to a swiveled handle unit (16) which includes a handle (18) a cylindrical tube (20) and fastener (22). The user rotates the handle (18) in a circular motion causing loop (12) to rotate in horizontal plane. The stem (14) is of a more flexible material than the loop (12) and the stem (14) and loop (12) are joined in a lightweight connection so as not to disturb the over-all balance of the loop (12).

Abstract: An aerodynamic device having a concave-convex disk member with a rim and a substantially flat portion terminating in a downwardly curved portion adjacent the rim forming an upper convex surface with vanes on the disk to effect outward air flow in response to rotation of the device. A device with the disk having an air opening in the flat portion and a second disk member within the first disk member with the periphery of the second disk member adjacent and spaced from the rim with an air discharge aperture therebetween, said disk members having ribs therebetween for effecting air flow outwardly in response to rotation thereof for providing increased lift to the device.

Abstract: A simulated laser firing target sighting and missile firing and tracking system is incorporated in a hand-held simulated jet fighter plane model. The operator views by looking vertically downwardly a centrally oriented target sighting control screen that depicts the spatial region immediately in front of the jet fighter model plane. The model plane is further equipped with two stub wing mounted firing control handles serving as the operator control means and being mounted on either side of the plane's control panel. Operator finger pressure exerted on the left side control handle firing button results in a visual display of a clearly visible white lighted inverted V-shaped image pattern along with a central white illuminated circle simulating a laser beam being fired at an imaginary target located within a central target circle scribed on the ground glass screen.

Abstract: A security door system includes an actuator mechanism housed in a box-like, closed housing to minimize the possibility of tampering with the actuator mechanism such as would permit unlawful entry through the door. The actuator mechanism drives one or more, and illustratively two, bolts which extend horizontally across the door. One of the bolts enters a receiver in the jamb along the edge of the door opposite the hinged edge. The other bolt enters a receiver provided in the jamb along the hinged door edge. The security door system further includes a jamb and frame construction in which the jamb and surrounding frame cooperate to provide the bolt receivers. A metal reinforcing plate which is fixed to the frame by long wood screws, or the like, forms a wall of the receiver. This metal walled, deep receiver is less susceptible to damage by tampering, such as by springing the jamb or ramming against the door, than prior art security door systems.

Abstract: A rest apparatus for supporting a cylindrical portion of a workpiece to be machined. A pilot shaft is supported at the opposite ends thereof by a support head and provided with a piston portion to form a hydraulic cylinder with a cylinder bore of a rest housing so as to move the rest housing toward and away from the workpiece. The axis of the pilot shaft passes through or slightly above the axis of the workpiece. Rotation of the rest housing about the pilot shaft is prevented. A pair of rest shafts are slidably but nonrotatably received in the rest housing for horizontally and vertically supporting the workpiece by a pair of rest shoes. Feed apparatus is operatively connected to the pair of rest shafts to feed the pair of rest shoes toward the center of the workpiece.

Abstract: Method for the precision blocking of lens blanks by the adjustment of each such blank until it occupies a prescribed position where an alloy hub or "block" is removably affixed to the blank so that it can be properly gripped for finishing.