Abstract: Disclosed is a temperature control device of a refrigerating apparatus and a method thereof, in which an operation rate of a compressor installed in the refrigerating apparatus is calculated and the compressor is controlled on the basis of the calculated operation rate of the compressor, thereby not needing to install outside air temperature detecting sensor and a damper and accurately controlling temperature of the refrigerating apparatus. To this end, there is provided a method for controlling temperature of a freezing chamber and a chilling chamber of the refrigerating apparatus having a compressor and a heat generating lamp, the method comprising the steps of: calculating an operation rate of the compressor installed in the refrigerating apparatus; and controlling an operation of the compressor on the basis of the calculated compressor operation rate.

Abstract: Disclosed is an indoor unit in an air conditioner of which components are arranged symmetrically so as to enable a compact design. The present invention includes a case having an intake port and a blow outlet, a blower installed inside a central part of the case along a length direction of the case, a heat exchanger installed between the intake port and blower so as to heat-exchange a room air which is sucked in, a fan motor coupled with one side of the blower so as to drive the blower, and a pipe part installed at a space opposite to the fan motor centering around the blower and connected between the heat exchanger an outdoor unit so that an operational fluid circulates through the pipe part.

Abstract: A closed circuit cooling tower for evaporative fluid cooler applications such as water-cooled residential and commercial air conditioning, geothermal cooling supplementation, and process cooling applications. Corrugated metal tubes are used for heat transfer to permit mechanical de-fouling, such as flexing the tubes. The cooling tower may operate at high dissolved solids, or gray water may be used in order to reduce water consumption. The cooling tower is lightweight and modular to permit retrofitting of existing rooftop air conditioning systems so that efficient evaporative cooling may be used to lower energy costs.

Abstract: A chilling apparatus (1) for chilling drinking vessels (44) comprising a liquid gas reservoir (3) in fluid communication with a chilling nozzle (4) under the control of a valve (41) controlled by a control unit (6), so that the drinking vessel may be chilled by a metered quantity of liquid gas vapourising from the chilling nozzle. The reservoir is provided with a vent (36) to prevent a buildup of vapourised liquid gas in the pipework and/or reservoir.

Abstract: A heat transfer engine having cooling and heating modes of reversible operation, in which heat can be effectively transferred within diverse user environments for cooling, heating and dehumidification applications. The heat transfer engine of the present invention includes a rotor structure which is rotatably supported within a stator structure. The stator has primary and secondary heat exchanging chambers in thermal isolation from each other. The rotor has primary and secondary heat transferring portions within which a closed fluid flow circuit is embodied. The closed fluid flow circuit within the rotor has a spiraled fluid-return passageway extending along its rotary shaft, and is charged with a refrigerant which is automatically circulated between the primary and secondary heat transferring portions of the rotor when the rotor is rotated within an optimized angular velocity range under the control of a temperature-responsive system controller.

Abstract: The present invention provides an accumulator 21 for evaporating and condensing a refrigerant in a pressure vessel 22 thereof to control pressure or the like in a closed-loop type controlled unit. The accumulator comprises liquid-phase refrigerant holding means 23 for holding the refrigerant in liquid phase, heating means 25 for heating and evaporating the refrigerant in liquid-phase, cooling means 24 for cooling and condensing the refrigerant in vapor-phase, and a connection port 28 in fluid communication with the controlled unit. The liquid-phase refrigerant holding means 23 includes a vane 32 made of a material capable of absorbing the refrigerant in liquid phase, and the end 35 of the vane 32 has a shape in contact with the inner surface of the pressure vessel 22.

Abstract: A gemstone arrangement is provided which includes a pair of individual pear shaped stones abutting one another along a connecting facet to form a heart shape.

Abstract: The invention relates to a method for producing glass panes of any desired contour from sheet glass, comprising the following steps: scribing scribe lines into a least one face of the sheet glass along the contour down to a depth T glass pane?, using a cutting device, and positioning the glass pane on a support. The inventive method is further characterized in that a defined force F is applied to the sheet glass so that it breaks along the scribe lines, said break extending through the entire thickness of the sheet glass.

Abstract: A method of making a glass ornament with a colorful cracked internal portion mainly fires a pure and transparent raw material as well as a colorful raw material to soften at 1500-1600° C. and at 600-700° C. respectively for different lengths of time; then the fired and softened colorful raw material is cut into small chunks to be wrapped inside the transparent raw material so as to form natural cracks through physical changes between the softness and the hardness; the cracked product is then shaped into molds; after being kept warm for about 5-6 minutes, a transparent ornament with colorful cracked internal portion is accomplished.

Abstract: A method and apparatus are taught for molding glass lens elements from glass preforms. A glass preform is placed on a first mold surface of a first mold element which resides in a first sleeve segment. The temperature of the glass preform, the first mold element, the first sleeve segment, a second mold element, and a second sleeve segment are elevated to at least the glass transition temperature of the glass preform, the second mold element residing in the second sleeve segment. The second mold element and second sleeve segment are moved toward the first mold element and first sleeve segment to form a mold cavity, the mold cavity including a lens chamber and an annular channel projecting from the lens chamber. The glass preform is compressed in the mold cavity to form a glass lens element with the excess glass from the glass preform flowing into the annular channel.

Abstract: Suction feeders of this type are used in the processing of glass and have a heatable feed line (1) consisting of noble metal. Said feed line is embedded in a heat-insulated manner in a housing (4a) with a refractory material (3a). Said housing has a connecting flange (5) for connection to a molten glass supply device and an exit flange (6) for operational engagement with a suction ball (7) which removes the gob from the feed line (1). According to the invention, the material (3a, 4a) surrounding the feed line (1) is configured in such a way in terms of the construction and/or substance that a negative pressure can be produced on the outer periphery of the feed line (1), so that the mechanical compression of the feed line (1) is minimised and air bubbles are not drawn up.

Abstract: A method for manufacturing an optical fiber, the method including the steps of: providing a substrate tube; depositing high purity silica-based cladding layers on the inside of the tube; depositing a germanium-free core comprising a glass including silica, and oxides of Al, La, Er, and Tm; collapsing the substrate tube to form a preform; and drawing the preform to yield an optical fiber.

Abstract: A method for manufacturing an optical fiber, the method including the steps of providing a substrate tube; depositing a boron-free cladding layer; depositing a core comprising a glass including silica, and oxides of Al, Ge, Er, and Tm; collapsing the substrate tube to form a preform; and drawing the preform to yield optical fiber.

Abstract: An optical fiber preform having a low core noncircularity and eccentricity for producing an optical fiber having an improved polarization mode dispersion, a method for producing the preform, and an optical fiber produced from the preform. The optical fiber preform is produced by the following steps. Diameter-reduced portions 11a and 11b are formed in the vicinity of the ends of the glass pipe 11. A glass rod 12 is inserted into the glass pipe 11. The glass rod 12 is fixed to the glass pipe 11 at the diameter-reduced portion 11a. The glass pipe 11 and the glass rod 12 are heat-unified from the diameter-reduced portion 11b forward to the diameter-reduced portion 11a. The optical fiber preform has a core noncircularity of at most 1.5%. The optical fiber has a polarization mode dispersion of at most 0.15 ps/km1/2 at a wavelength of 1,550 nm.

Abstract: A fiber-forming bushing comprises a tip plate and a lateral support. The tip plate comprises at least two tip sections and the section spacing between the tip sections. The lateral support extends laterally along the section spacing.

Abstract: A sock of double layer knit construction formed on a circular knitting machine, including a tubular inner layer and a tubular outer layer surrounding the inner layer. The inner layer and the outer layer are connected together during the knitting thereof at spaced locations by a yarn extending between the layers. The connecting yarn is knit predominately in one of the layers and is knit into the other layer for connecting purposes only. The connecting yam is knit into the other layer as tuck stitch loops.

Abstract: A clothes washing machine is provided with an improved detergent dispenser which can use either liquid or powder detergent for both the prewash and wash cycles of the machine. The dispenser includes a base for receiving the prewash detergent. A tray having a powder detergent cup and a fabric softener cup is positioned within the base. A liquid detergent cup is removably nested within the powder detergent cup. The liquid detergent cup includes a siphon which drains into the powder detergent cup, which in turn drains into the base of the dispenser. The softener cup includes a siphon which drains into the base of the dispenser. The base includes an outlet drain through which the detergent and fabric softener drain for introduction into the tub of the washing machine.

Abstract: Dual chamber apparatus including a body providing a first chamber containing liquid, a closure closing the first chamber and a second chamber containing a body of material including a portion extending out of the second chamber, upon the closure being removed and the liquid being discharged from the first chamber the body of material for engaging and reacting with the liquid. The apparatus may be embodied as spot remover apparatus with the liquid being liquid spot remover and with the body of material being absorbent material for absorbing the liquid spot remover upon being discharged and removing a spot. Process of manufacturing such apparatus.

Abstract: A security device (10) for books comprising a receptor (20) adapted to fit behind the spine of a book, a connector flap (30) adapted to be secured to the receptor and to locate between and parallel with the pages of the book, and means (50) to lock the connector flap (30) to the receptor (20) to entrap the book.

Abstract: A zipper locking device comprises a zipper, a zipper slider, and a locking member. The zipper slider and the locking member each have loops formed thereon. The locking member is attached to an article adjacent an end of the zipper and is configured such that one of the loops can be passed at least partially through the other of the loops in a manner such that a lock can then be used to secure the loops together. With the loops secured together, the zipper slider becomes locked to the locking member and the zipper cannot be opened.

Abstract: A bicycle lock attached to a beverage container holder securable to a bicycle frame is provided. The lock is attached to the bottom of the bottle holder in order to position the lock in an easily accessible and out of the way location on a bicycle frame. The lock includes an extendible cable which can be encircled about the bicycle frame and an immovable object and reengaged with the lock to ensure that the bicycle cannot be stolen.

Abstract: A door lock set includes: an outer lock held in an outer trim plate on an outside surface of a door, a latch device for locking the door on a door frame, an inner reinforced retaining member fastened with the outer lock and retained on an inside surface of the door, an outer reinforced retaining member fastened with the inner reinforced retaining member across the door, an inner trim plate having an inner knob or handle rotatably or pivotally held on the inner trim plate fastened to the inner reinforced retaining member and retained on an inside surface of the door; and the outer lock fastened to the inner reinforced retaining member for retaining the outer trim plate on the outside surface of the door for providing a door lock set easily assembled but difficultly damaged.

Abstract: Slow-release fertilizer is produced by composting animal manure with a magnesium-rich compound The temperature of this mixture is maintained at 20-30° C. and the pH is maintained between 7-10. Urease is added to the mixture. Next, the mixture is inoculated with bacteria of the species Bacillus sphaericus, Bacillus globisporus, or Bacillus fusiformis. The mixture is then allowed to incubate for about 14 days to form magnesium ammonium phosphate. Optionally, phosphatase, an enzyme promoting the formation of phosphate from phosphorus-rich organic compounds, is added with the urease enzyme to increase the yield of magnesium-ammonium phosphate.

Abstract: The present invention is directed to new compositions of matter comprising the reaction products of a carboxylic acid and a urea having the formula 1

Abstract: The use of inorganic or organic polyacids for the treatment of inorganic fertilizers, in particular the use of the polyacids as a mixture with at least one nitrification inhibitor for the treatment of inorganic fertilizers; the use of selected pyrazole derivatives as nitrification inhibitor in inorganic fertilizers and also as stabilizers of liquid manure or liquid fertilizer formulations, as well as the corresponding treated inorganic fertilizers per se; and novel pyrazole derivatives which can be used as nitrification inhibitors in inorganic fertilizers and also as stabilizers of liquid manure or liquid fertilizer formulations are described.

Abstract: This invention relates to an apparatus that is a portable sheet metal apparatus generally for bending sheet metal and more particularly to an apparatus for forming a gutter guard assembly ready to be installed between the outer lip of a rain gutter and a first row of shingles on a shingled roof. Said apparatus comprising a first bending member having a cylindrical bar, a second bending member hinged to the first bending member to provide a means for bending the sheet metal, said second bending member having an angled portion, leg portions, and at least one handle member, wherein pulling the handle member forward and downward provides the application of both pressing and releasing forces against a work piece sheet metal as it is bent between said cylindrical bar of the first bending member and the angled portion of the second bending member.

Abstract: In a forming press, a blank is pressed formed into a press-formed workpiece by means of an upper die and a lower die, while a peripheral edge portion of the blank is clamped by means of a die and a blank holder insert of the forming press. Subsequently, a central portion of the press-formed workpiece is partially held by means of the upper die and the lower die so as to draw a peripheral portion of the press-formed workpiece away from the central portion thereof, thereby removing strain from the press-formed workpiece.

Abstract: The self-calibrating carbon monoxide detector and method of the present invention utilize the gas for which the detector was designed to detect as the calibration gas. Specifically, a carbon monoxide gas generator is included in the detector assembly, and is controlled to produce a known amount of CO. The sensor response to the quantity of CO generated is monitored, and the calibration thereof adjusted as necessary. The operation of the gas generator is also monitored, and any failures are flagged for user attention. The gas generator specifically suppresses the generation of hydrogen through the materials used in its construction. Temperature effects may also be compensated either through control of the gas generation control parameters or compensation of the sensor output in view of the generator temperature effects.

Abstract: A system (10) and method is provided for calibrating a tire pressure monitoring system using an EM transmitter (14). The present invention includes a first pressure sensor coupled to a wheel of an automotive vehicle (12). The EM pressure transmitter (14) is coupled to the pressure sensor (32). The transmitter (14) has a serial number associated therewith. An EM calibration device has a transmitting range. The EM transmitter device has an actuator. When the actuator is activated, a calibration signal (34) is transmitted within the transmitting range. The calibration signal causes the EM pressure transmitter (32) to transmit a serial number. A controller (16) is EM coupled to the pressure transmitter. The controller (16) receives the serial number and associates the serial number with a tire location of the vehicle.

Abstract: A plurality of multi-parameter monitoring tool assemblies are connectable over a communications network and are further in communication with a central controller. Each of the tool assemblies is configured to interconnect with one or more sensor head components which may be employable in the monitoring of water quality. According to the system described herein, the central controller may periodically communicate with one or more of the tool assemblies connected in the communications network and extract, process, and display information as to the configuration and operation of one or more tool assemblies.

Abstract: A system for measuring oil condition in large engines includes a bypass valve that is installed in a lubrication system along a fluid line between an oil pan and an engine. The bypass valve communicates with a measurement chamber and when energized by a control module, the bypass valve diverts oil from the lubrication system to the measurement chamber. An oil condition sensor is disposed within the measurement chamber and is used to determine the condition of the oil that is diverted to the chamber. After the condition of the oil is determined, the bypass valve is energized to release the oil from the measurement chamber back into the lubrication system.

Abstract: A device (10) serves to measure the injection quantity of injection systems (16), in particular for motor vehicles, and in particular in production testing. The device (10) includes a measuring chamber (14), and a coupling device by which at least one injection system (16) can be coupled to the measuring chamber (14) in pressureproof fashion. The device (10) further includes a piston (26), which is held displaceably in a guide device (18) and regionally defines the measuring chamber (14). Finally, a sensor (50) is also provided, which upon an injection by the injection system (16) detects a displacement of the piston (26). To increase the measurement precision, it is proposed that the piston (26) be at least essentially closed and be hollow in its interior.

Abstract: A meter for a motor vehicle includes a meter case 4 for protecting components of the meter which are incorporated therein, and a front cover 9 composed of a prism which is a part of a convex lens and provided in front of the meter case 4. A dial plate 5 of the meter has an outer contour in a substantially elliptical shape so that a virtual image of the dial plate as seen through the front cover 9 may look like a substantially perfect circle. Since the virtual image of the dial plate 5 is expanded in a vertical direction due to magnification inherent in the prism 9, the dial plate 5 formed in a substantially elliptical shape will be deformed into a substantially perfect circle in sight.

Abstract: A tire condition sensor unit (e.g., 18A) is for use within a tire condition communication system (10). The sensor unit (e.g., 18A) is for association with a tire (e.g., 14A) of a vehicle (12) and, via a method, communicates a tire condition to a vehicle-based unit (28). A sensor (58) senses the tire condition. Radio frequency transmit circuitry and an antenna (68 and 22) transmit a radio frequency signal (e.g., 24A) that indicates the sensed tire condition. In one aspect, a low frequency antenna and a signal detector (48 and 52) receive a low frequency initiation signal that causes transmission of the radio frequency signal indicative of the sensed tire condition. In another aspect, the radio frequency signal is also indicative of a fixed identification.

Abstract: A wheel bearing for measuring the contact forces between tire and road. The forces which act between the road and the tire in a vehicle are to be recorded under all driving situations including operation of the brake. This information about the currently acting forces is used by vehicle operation control systems and for optimizing the braking process. For this purpose, first sensors are arranged on the stationary part of the wheel bearing in order to measure the forces acting in the wheel bearing. In addition, the currently acting braking forces are continuously determined by means of the second sensors, which are arranged on support members 6 for the disk-brake caliper. During unbraked travel, conclusions can be drawn directly on the forces acting between the road and the tire from the measurement results from the firt sensors.

Abstract: Methods and apparatus for isolator pad assemblies used in formation testing equipment. The pad comprises a primarily metallic pad member and a retractable resilient sealing member. The resilient sealing member is maintained in a retracted, protected position until extended to seal against the wellbore. When extended the metallic pad pushes into the mudcake until a raised ring of material on the surface of the pad contacts the formation. Once the pad is in place, the resilient sealing member, which is molded to an extending metal sleeve, is extended and contacts the mudcake to form a primary seal. With the primary and secondary seals energized, a fluid sample can be collected from the formation without contamination from wellbore fluids.

Abstract: A device for recording the fill level of a liquid inside a container in which an elongated, flexible tubular electrical contact element is arranged, one end area of which is provided with connections at which an electrical signal can be measured. Electrically conductive coatings are disposed on the inner surface of the contact element and facing towards one another, which coatings may be brought into contact with one another by means of a contact producing acquisition element which is disposed on the outside and is movable relative to the flexible contact element.

Abstract: A highly sensitive accelerometer for determining the acceleration of a structure includes a mass within a housing suspended by opposing support members. The support members are alternately wound around a pair of fixed mandrels and the mass in a push pull arrangement. At least a portion of one of the support members comprises a transducer capable measuring the displacement of the mass within the housing. An embodiment of the invention employs optical fiber coils as support members for use in interferometric sensing processes. Arrays of such interferometer based accelerometers maybe multiplexed using WDM or similar methods.

Abstract: Ultrasonic testing techniques may involve the measurement of ultrasonic waves from the tested part. These waves may reflect from surfaces of various layers within the part. Further, these waves may reflect from faults, defects, voids, fractures, and others. As such, the measured ultrasonic wave is a complex mix of these reflections. One method for detecting flaws, defects, and others may be to express the signal in terms of a set of basis functions. These functions may be summed to produce the measured signal. Further, basis functions may be chosen such that a select set of the basis functions characterize the fault and/or defect. In one exemplary embodiment, the coefficients associated with the basis function may be non-zero when a defect is present. As such, a defect may be detected quickly and automatically.

Abstract: A pressure sensor having a radially tensioned diaphragm for measuring fluid pressure. The pressure sensor includes a first generally concave metal body member and a second generally concave metal body member, and a radially tensioned flexible metal diaphragm disposed therebetween that is tensioned by heating the sensor. The first and second body members are formed from a material having a coefficient of thermal expansion in the range of approximately 0.0000056 inch/inch/° F. to 0.0000064 inch/inch/° F. The diaphragm is formed from a precipitation hardening metal material having a coefficient of thermal expansion of approximately 0.0000060 inch/inch/° F. The first body member and the second body member are formed from a ferromagnetic metal material such that the first and second body members shield the diaphragm from magnetic fields which may otherwise cause movement of the diaphragm.

Abstract: The test device for determining the friction and prestress values of screwed connections consists of a transportable device having a central support plate (1), whereby shearing force sensors and axial force sensors (7, 8, 11) are arranged on both sides of said plate. The sensors are screwed between an application plate (2) and a torque receptor plate (3) and can be replaced or provided with adapters (4, 5). The sensors (7, 8, 11) can be extension sensors or piezoelectric sensors. The amplifiers of the piezoelectric sensors can be miniaturized in such a way that they can also be placed in the central support plate (1). During tightening, the following values are determined: total torque Mtot, head friction torque MK, thread friction torque MG, prestress force Fz, to obtain the following values: thread friction value &mgr;G and head friction value &mgr;K.

Abstract: This invention relates to a method and apparatus for surveying the geometry of tunnels comprising measuring the position of a tunnel surface relative to an absolute three-dimensional coordinate system, using at least one reflectorless distance sensor mounted for orientation in three dimensions and calculating a deviation from a predefined geometry for the surface and displaying said deviation in real time.

Abstract: A method of unobtrusive evaluation of structural material integrity without requiring physical contact for referencing integrity values, comprising: directing an impact source at said structural material; obtaining signal information from the structural material by optical reflectometry; and, processing the signal information to determine physical properties of the structural material.

Abstract: A flow sensing venturi system includes a venturi body and a manifold mounted thereto. The manifold is thermally isolated from the venturi body. A multiple of sensor ports are formed into the manifold which support each individual sensor and provide communication between the sensor and one or more passageways. The passageways communicate with a single high-pressure and a single low-pressure sense line. The high and low pressure sense line tap respective high and low pressure areas within the venturi body. The sensor is individually screwed into the manifold to provide an airtight connection for two independent sensor input ports. Replacement of individual sensors is thereby greatly simplified.

Abstract: Apparatus for measuring or detecting one or more parameters of a gas, such as compressed air, in a line through which the gas is flowing by a sensing portion of an elongated wand which is axially inserted through piping attached to the line and advanced into the line radially thereof. The apparatus of the present invention, and the method of its use, avoid the problem of the wand being forcibly ejected from the piping upon removal thereof by providing an element having a diameter larger than the passageway in the packing gland through which the wand is inserted. The element is attached to an elongated tubing portion of the wand after insertion of the distal end of the tubing through the packing gland. The element may be one end of the probe containing the sensing elements, a plug closing the distal end of the tubing, or an additional, larger diameter of the section of tubing.

Abstract: A method and appartus for measuring volumetric flow through a duct without knowing the viscosity of the fluid is provided. A dual rotor turbine volumetric flow meter is operably connected to a duct having fluid flowing therethrough. The dual rotor turbine has a temperature gauge, a first rotor and a second rotor with at least one of said first rotor and said second rotor having a non-linear response to fluid flow. The dual rotor turbine volumetric flow meter is calibrated by deriving a Roshko/Strouhal number curve therefor. During measurement, a first rotor frequency and a second rotor frequency are determined. The second rotor frequency is divided by the first rotor frequency to derive a frequency ratio which is then used to calculate a combined Roshko number. A combined Strouhal number is derived by using the combined Roshko number in conjunction with the Roshko/Strouhal number curve. The volumetric flow rate is calculated using the combined Strouhal number.

Abstract: A device for measuring an angle and/or the torque acting on a rotatable body is proposed according to the invention, whereby the rotational angle is detected by means of magnetic or optical sensors. In particular, in a preferred exemplary embodiment, two devices (7, 8) are proposed, each of which comprises two optically readable code tracks. The two code tracks (1a, 1b or 2a, 2b) on one device (7 or 8) are similar in design and are offset in relation to each other, so that associated sensors (4) output a digital signal. The rotational angle is calculated based on the lag between the two digital signals. In a further embodiment it is provided that a torsion element (5) having a known torsional stiffness is situated between the two devices (7, 8). Torque transferred by the rotatable body (3) can also be calculated therefore from the angular difference of the two devices 7, 8. The device is used preferably in the steering axle of a motor vehicle.

Abstract: A method of sorting mail according to the invention includes the steps of receiving a plurality of first mail pieces of unknown origin in a first apparatus for bulk processing of the mail pieces, processing the mail pieces in the first apparatus by one of testing the mail pieces to determine if a potentially dangerous microorganism is present, sterilizing the mail pieces to destroy microorganisms on mail pieces, or both, and then if no contamination is detected or if sterilization is carried out, combining first the mail pieces at a later stage of postal processing with second mail pieces from senders identified as having a lesser risk of contamination than the first mail pieces of unknown origin. The invention further provides mail contaminant detection and sterilization systems suitable for use in such a method.

Abstract: A land mine probe includes a handle and a first shaft extending from the handle and terminating at a tip. In one embodiment, the probe includes a second shaft extending from the handle and terminating at a second tip. In another embodiment, the shaft includes a plurality of segments releasably attached to one another and releasably attached to the handle. In yet another embodiment, the probe includes a sound amplification device. In still another embodiment, the probe includes a device for emitting light in a direction towards the tip.

Abstract: A noise reduction structure is provided for use with a meshing gear assembly, such as in a power take-off unit for selectively providing power to one or more rotatably driven accessories. The meshing gear assembly includes meshing input and output gears that are supported within a housing and are rotatably driven during use. A helical coil wrap spring extends about and is frictionally engaged with a portion of the output gear. A first end of the wrap spring extends outwardly therefrom to form a control tang that extends adjacent to an abutment surface provided on the housing of the power take-off unit. As a result, the wrap spring is prevented from rotating relative to the housing as the output gear is rotatably driven.