Abstract: A flashing structure for installation along a roof edge to aid in proper drainage of moisture run-off. The sheet metal flashing includes a planar body portion for installation under the shingles or other roof covering and extending from a free edge to a parallel drainage edge. The flashing is bent at the drainage edge to extend back under and away from the body portion in a continuous curve, preferably of constant radius, for about 180.degree.. The flashing is bent again at an angle of less than 90.degree. at the juncture of the curved portion and a flat portion which extends from the juncture edge to a drip edge where the material is bent back upon itself to provide a portion extending to a terminal edge.

Abstract: A method of formulating dairy cow rations based on the amounts of ruminally available protein (RAP) and carbohydrates (RAC) in the total daily ration, which includes both grain and forage components. Quantities necessary for determining RAP and RAC values are obtained from conventional chemical analysis and in situ techniques. Statistical analysis of experimentally obtained data showed optimized lactation response is obtained from a total daily ration containing RAP and RAC in the ranges of about 10.5-12.5% and 35.0-45.0%, respectively. Other important nutritional factors such as microbial synthesis and feed escape protein were also shown to be optimized by total daily rations containing RAP and RAC levels within or near the lactation optimization ranges.

Abstract: Apparatus for enhancing a message comprises an elongated housing defiing an open front for releasable positioning of a first message panhel having opaque and transparent portions constituting the message of one's choice. A stationary fluorescent light tube is positioned within said housing. A multi-colored, translucent tubular sleeve is positioned for rotation about said light tube such that light passes through said sleeve to emit a seemingly moving array of colored lights. A trough-shaped reflective panel is positioned behind the light and sleeve within the housing such that light impinged upon its reflective surface is reflected to impinge upon the message panel to thereby appear through the transparent portions of the message panel and visually enhance the message. A second message panel which is translucent and textured may be placed behind the first message panel to make the light appearing therethrough seem patterned.

Abstract: A security mailbox including an upper compartment for conventional and a lower compartment for secured deposit of mail. An interior partition includes a rear portion movable about a hinged connection to a fixed, front portion between a horizontal position, wherein the partition substantially entirely separates the upper and lower compartments, and a lowered position, wherein the movable portion extends into the lower compartment and permits mail deposited in conventionl fashion in the upper compartment to fall into the lower compartment from which it may be removed only by authorized persons through a normally locked door. the apparatus is characterized by the absence of any structure inside the housing which could interfere with normal deposit of mail, and by a lockable support permitting movement of the portion of the partition from its lowered to its horizontal position only by authorized persons.

Abstract: A boat anchor having a shank which is pivotally movable relative to the other elements is designed to provide three stop positions defining terminal positions of movement of the shank in each direction. A primary stop is provided by contact of a pin extending laterally through the shank with edge portions of the crown side, between which the shank is mounted. A secondary stop, operable upon failure of the primary stop, is provided by contact of the end of the shank adjacent the pin with inner surfaces of the crown heads. A tertiary stop, operable upon failure of the secondary stop, is provided by mutual contact of edge portions of the shank and crown heads.

Abstract: An otherwise conventional mine roof expansion anchor of the bail-type is provided with a tubular retainer member encircling the shell leaves and having an external cross-dimension significantly (e.g., at least 0.10") greater than the diameter of the drill hole in which the anchor is to be installed. Thus, as the anchor, supported on the end of a roof bolt, is advanced into the drill hole in the usual manner, the tubular element is pushed off the anchor by contact with the surface surrounding the drill hole, thereby eliminating the previously required manual removal of the retainer. The tubular retainer has the same cross-sectional configuration in all planes perpendicular to its central axis throughout its full length, preferably being formed as a plastic extrusion.

Abstract: A vane compressor includes a cylinder having a pair of side blocks. A communication passage is formed through at least one of the side blocks. The communication passage has one end thereof opening into a discharge pressure chamber, and another end thereof opening in a rotor side end face of the at least one of the side blocks at a location corresponding to the orbital path of an end of a back pressure chamber defined in each of vane slits having a vane slidably fitted therein. The communication passage is provided therein with a valve which opens the communication passage when the difference between pressure in the discharge pressure chamber and pressure in the back pressure chamber is below a predetermined value, and closes same when the difference in pressure is above the predetermined valve.

Abstract: An expansion shell assembly of the type including a pair of unitary expansion shell elements, each having two leaf members joined adjacent their lower ends by bridge portions with a bail fixedly attached at terminal ends to outer surfaces of the bridge portions to maintain the expansion shell elements in assembled relation. The bridge portions include a recessed area extending continuously between its upper and lower edges. The recessed areas are divided into two portions, with the lower portions substantially narrower than the upper portions, wherein terminal ends of the bail are secured. Opposing edges of the shell elements are in spaced, substantially parallel relation with the space therebetween free of any structure extending into such space over the full axial length of the shell elements. Relieved areas extend into the inner surfaces of the bridge portions to provide a clearance for the lower end of a tapered camming plug which is moved between the shell elements to effect radial expansion thereof.

Abstract: A variable capacity vane compressor has a first oil sump formed in a bottom of a discharge pressure chamber arranged at one side of a cylinder close to one side block, and a second oil sump formed in a bottom of a suction chamber arranged at another side of the cylinder close to the other side block. An oil passageway communicates between the first oil sump and the second oil sump. A control element is arranged in the other side block for rotation about its own axis in opposite directions to thereby vary the compression starting timing. A pressure chamber acts to apply control pressure created from discharge pressure from the cylinder to the control element for causing rotation of the control element. A seal member is fitted on the control element such that part of the seal member is located in the pressure chamber. A high pressure-introducing passageway is formed in the other side block and communicates with the second oil sump.

Abstract: An output circuit for a portable generator having a plurality of output windings provided separately from each other, and control winding provided separately from the output windings. A plurality of thyristor bridge circuits each having thyristors are connected respectively to the output windings. A superposing circuit superposes outputs from the thyristor bridge circuits one upon another to provide a first superposed output voltage. A rectifier circuit is connected to the control winding. The rectifier circuit is disposed such that its output voltage is superposed upon the first superposed output voltage to provide a second superposed output voltage. A control circuit is responsive to the second superposed output voltage for concurrently controlling voltages applied respectively to the gates of the thyristors of the thyristor bridge circuits to thereby maintain the first superposed output voltage at a constant value.

Abstract: A prestroke control device for a fuel injection pump includes at least one control sleeve slidably fitted on at least one plunger, a control rod engaging the control sleeve, the control rod extending perpendicularly to the plunger and rotatable about an axis thereof for varying an axial position of the control sleeve relative to the plunger to thereby control the prestroke of the plunger, and an actuator for rotatively driving the control rod about its own axis. A counterweight is movable in unison with rotation of the control rod for cancelling a rotating force generated by axial movement of the control sleeve and acting upon the control rod.

Abstract: A two-piece wall plate for use with a wall mounted receptacle, switch or other wiring device. A first, frame-like base plate is secured by screws to the mounting ears of the wiring device, and a second, frame-like cover plate is releasably connected to the base plate, in covering relation thereto. A bezel portion of the base plate closely surrounds the periphery of one or more wiring devices mounted in the usual way in a conventional wall box, and extends through a central opening in the cover plate. The cover plate is mounted on the base plate by a snap fit connection provided by elongated grooves in the outwardly facing side surface of the bezel which receive elongated ridges extending inwardly about the boundary of the central opening in the cover plate.

Abstract: An assembly and methods of installation thereof for supporting and stabilizing a rock structure adjacent a mine tunnel or other underground passageway. The assembly includes an elongated bolt, threaded from both ends for at least a portion of its length. A conventional, mechanical expansion anchor is threaded on one end of the bolt, within a drill hole in the rock structure, and a bearing plate, washer, jam nut and tensioning nut are carried on the other end, outside the drill hole. The tensioning nut is threaded into firm engagement with the jam nut to prevent further threaded advance of the tensioning nut a substantial distance from the termination of the threads. A torque applied to the tensioning nut thus rotates the bolt and expands the anchor shell into gripping engagement with the bore hole wall; torque producing an axial load on the jam nut in excess of its strength causes it to fracture or strip from threaded engagement with the bolt, permitting travel of the tensioning nut.

Abstract: A variable capacity vane compressor has a control element rotatable in response to the difference between suction pressure and control pressure for varying the compression starting timing and hence the capacity. A communication passage extends between the suction chamber and a high pressure chamber in which the control pressure is created. A spool valve opens and closes the communicating passage. An electromagnetic actuator generates an electromagnetic force to cause the spool valve to open the communication passage when energized. A control unit is arranged outside of the compressor and supplies the actuator with an external control signal for energizing the actuator.

Abstract: An envelope intended for use in both original and return mailings includes a removable and reuseable address label in one of the mail-to and return address locations on the front panel. Removal of the label creates a window, which may optionally be covered by a transparent liner, for viewing an address on a portion of the envelope contents placed behind the window. Removal of the label is facilitated by slit perforations forming portions which may easily be grasped for lifting and removing the label which has an adhesive on its rear surface for affixing it to the envelope in the mail-to or return address location opposite its original position. The envelope flap includes two adhesive-coated areas, separated by perforations, for individual use in the forward and return mailings.

Abstract: A security system includes a microcomputer with an auxiliary read-only memory and a key device including a similar read-only memory, each of the read-only memories containing corresponding pluralities of corresponding binary combination codes. Under the control of the microcomputer the codes are read and compared. If the combination and the sequence do not compare, the system will not unlock and an alarm will be generated. The read-only memories are of the programmable type, so that changes in the combinations and sequences can be accomplished easily. A plurality of visual indicators and an audible alarm provide the user and personnel in the secure area with information concerning the status of the system.