Abstract: A fluid regulation system is provided comprising a source of a fluid, a tube in communication with the source for delivering the fluid from the source to a site, and a valve for controlling the rate of fluid flow from the source to the site. A remote control unit for controlling the valve is also provided to allow the user to adjust the rate of fluid flow from the source through the tube to the site. Typically, the system excludes any means for automatically adjusting the rate of fluid flow from the source through the tube to the site. The invention is particularly useful when the valve is out of the user's reach. Also provided is a method for delivering of a fluid to a site.

Abstract: A respiratory mask assembly for delivering breathable gas to a patient includes a frame and at least one locking clip. The frame has a main body and a side frame member provided on each lateral side of the main body, at least one of the side frame members including a locking clip receiver assembly. The at least one locking clip has a main body providing a front portion adapted to be removably coupled with the at least one locking clip receiver assembly and a rear portion adapted to be removably coupled to a headgear assembly. The rear portion includes a cross bar that forms an opening through which a strap of the headgear assembly can pass and be removably coupled with the cross bar, and the front portion includes at least one resiliently flexible spring arm that is flexible within the plane of the main body.

Abstract: A strap system is useable with an anesthesia/respiratory face mask having an axially extending gas port connector and a gasket member. The gas port connector has a first diameter, and the gasket member is engageable with and conformable to a face of a patient. The strap system includes a strap member having a first end portion, a second end portion and a middle portion, and a collar. The collar includes an axially extending portion having a second diameter. The strap system includes a strap having a first end portion, and a second end portion; the collar also includes a radially extending portion having at least a first and a second slot through which the first and second end portions, respectively of the strap can pass. The slots are sized for adjustably receiving and fixedly positioning the first and second end portions of the strap.

Abstract: A system to alleviate a symptom of chronic obstructive pulmonary disease in a lung of a patient by providing a ventilation bypass pathway which allows air to exit the lung via the bronchus or trachea. The system includes a conduit connected by an airway connection device to an artificial opening through a wall of a region of a trachea or bronchus external to the lung. The other end of the conduit is connected by a lung connection device to an opening through a visceral membrane of the lung. A flow-control device such as a filter or valve is connected to the conduit to allow exhalation via the conduit but control flow from the airway to the lung. The conduit creates a direct fluid communication between the lung of the patient and the airway of the patient which permits air to exit the lung and enter the airway via the conduit.

Abstract: A control hood for blindfolding a person, comprising, an elongated handle, a ring attached to the handle, where said ring includes at least one peripheral flange, and a pliant blindfolding hood for covering the head and upper neck of a person and having an opening with elastic perimetric edges in one end thereof, said edges adapted to be mounted on the ring around its perimeter.

Abstract: A method for creating a monkey model of spinal cord injury, which includes exposing the dura mater of the cervical cord of a monkey and applying a load on the dura mater; the thus-created monkey model of spinal cord injury; and a method for evaluating a therapeutic drug for spinal cord injury by use of this model. According to the present invention, it is possible to create a monkey which is close to the human and thus useful as a model of human spinal cord injury. This model enables proper evaluation of therapeutic effects of various drugs on spinal cord injury. Through use of this model, it has been confirmed for the first time that transplantation therapy of human neural stem cells is efficacious against spinal cord injury.

Abstract: A smoking device having an integrated lighter, a bowl for holding tobacco, and a duct for drawing smoke like a pipe. The device consists of a ignition switch located on the side of the pipe in natural proximity to the thumb, a piezo-electric ignition system, a flammable gas delivery system, a bowl for holding smoking material, and an aperature for drawing tobacco.

Abstract: A smokable rod for a smoking article, such as a cigarette, possesses a co-axial or concentric construction. The outer material that circumscribes the inner core in an annular fashion is composed of a tobacco material treated with a burn suppressing agent, and the outer material acts as a substrate for an aerosol forming material. A preferred aerosol forming material is glycerin. An outer paper wrapper circumscribes the length of the smokable rod, and another paper wrapping material also can circumscribe the inner core material. In use, one end of the smokable rod is lit, and the tobacco cut filler of the inner core burns to yield tobacco smoke. The outer material smolders, and hence thermal decomposition products of the outer tobacco material and volatilized aerosol forming material are produced.

Abstract: A hair extension system provides a skin weft of flexible material having hair like fibers uniformly displaced thereon. Micro rings are fixed to the skin weft and provide an anchoring feature for strands of human hair from a scalp to be secured thereto. The micro rings are deformable and include a flexible protectant so as to minimize damage to the strands of hair. The hair system may be reused by re-opening the micro rings and reinstalling the hair extension system to another location.

Abstract: A hair retaining clip including a first clip member, a second clip member, a hinge, an elastic member is disclosed. The first and second clip members each include a handle portion and a claw portion. The hinge is disposed between and pivotally connects the first and second clip members. An elastic member is disposed between and connects to the first and second clip members thereby biasing the claw portions of the respective first and second clip members together.

Abstract: A fluid ejection gun includes: a flexible ejection tube for ejecting a fluid, the fluid being supplied to the inside of the ejection tube, the fluid being ejected from the tip of the ejection tube; a guide disposed to surround the ejection tube and introduce the ejection tube along the inner surface of the guide, the ejection tube being moved by the fluid ejected from the tip of the ejection tube; a casing disposed to surround the guide, the casing having an opening section forward in the ejection direction of the fluid ejected from the tip of the ejection tube; and a suction unit provided to the casing for sucking the fluid ejected from the ejection tube.

Abstract: An aqueous tube cleaning system as described herein can be utilized to clean a plurality of tubes having different lengths. The system includes a tower assembly having a wash chamber that houses the tubes during the cleaning cycle. The tower assembly is held in a horizontal load/unload position for loading and unloading of the tubes. The system rotates the tower assembly into a vertical cleaning orientation to accommodate cleaning with cleaning and rinse solutions, which flow through and around the tubes using the force of gravity. After rinsing and draining, the tower assembly is rotated back to the horizontal position for unloading.

Abstract: An improved method and apparatus for flushing the residue from internal surfaces of cavities in, for example, turbine blades. In accordance with one aspect of the invention, provision is made for simultaneously flushing the internal cavities of a plurality of turbine blades, with each blade having a plurality of cavities therein.

Abstract: A spray arm for a dishwasher is provided, comprising a first portion having a first engaging surface extending about an outer surface periphery thereof, and a second portion having a second engaging surface extending about the outer surface thereof and complementarily configured with respect to the first engaging surface. The engaging surfaces form a laterally-extending, non-linear interface upon engagement such that the first and second portion outer surfaces are directed away from each other. The second portion also includes a flange extending about the outer surface, and disposed laterally outward of and spaced apart from the second engaging surface, to define a channel having a depth extending across the interface. A securing material is introduced into and substantially fills the channel, and extends across the interface and about the first portion outer surface periphery, to secure the first and second portions together. An associated method is also provided.

Abstract: The present invention relates generally to portable sun shades, and more particularly to those that are attachable to portable chairs. The sun shade invention includes a set of chair connectors that are “press fit” onto a frame member of a portable chair, and the chair connectors mechanically support the weight of the sun shade so that it maintains its position on the chair, without any other fasteners or locking hardware. The sun shade also includes a flexible support member along each side of its overall frame structure, which allows the sun shade to be positioned at various angles with respect to the horizontal plane. The sun shade further includes an adjustable width capability so that it can be mounted onto different models of portable chairs, of different widths.

Abstract: The technology of the present application provides a collapsible canopy shelter having reinforced eaves for additional structural integrity, as well as at least one collapsible ventilation flap in the canopy cover that is capable of moving between a closed position and an open position to ventilate air from beneath the canopy cover as desired. Further, the collapsible canopy shelter comprises a canopy frame with a robust, spring-loaded pull latch, allowing the user to quickly and easily assemble and collapse the shelter without risking injury.

Abstract: A hydrant backflow prevention system comprises a backflow prevention valve, operably coupleable to a hydrant to restrict passage of materials through the hydrant into a water supply feeding the hydrant. The backflow prevention valve is installable fluidly inline with the water supply at a location below which an upper dry barrel of the hydrant is coupled to a water delivery system. The backflow restriction valve is operable to substantially restrict backflow into the water supply when in a closed position, and allow flow of water through the hydrant when in the open position.

Abstract: “SINGLE SYSTEM FOR CONTROL OF HIGH OR LOW PRESSURE GASES FLOW RATE AND VALVE FOR CONTROL OF HIGH OR LOW PRESSURE GASES”, consists essentially in a system (S), which has active control of the movement of the valve (1) ram (P) solely by the concept of measurement of the flow rate and by the difference of pressure between the input and output of said valve (1), which, based on certain preconceived parameters, opens or closes the ram (P) so as to compensate the error between the actual and programmed flow rates.

Abstract: A shear valve employing a two-stage main poppet valve. The two-stage main poppet valve that can be opened with less force than normally required by prior art designs. For example, if there is pump pressure trapped on the upstream side of the two-stage main poppet valve and little or no pressure or atmospheric pressure on the downstream side, more force than can be provided may be required to open the two-stage main poppet valve to reset the shear valve after the two-stage main poppet valve is closed. The two-stage main poppet valve is designed to first begin to equalize pressure differential across the shear valve without opening a main poppet valve head from its seat inside the shear valve. Thereafter, the main poppet valve head can be opened with less force than otherwise would be required.

Abstract: The invention relates to a diversion which can be used under load conditions in a fluid distribution system without interrupting the fluid supply or installing a by pass. The diversions consists of a body that is formed by two complementary components including an upper component comprising openings which are oriented transversely to the direction of the pipe to be cut off, which are equipped with seals and which are designed such as to enable the insertion and passage of a cutting blade that is associated with an external guillotine. The aforementioned upper component comprises an inner collar or flange which can be coupled and secured to the pipe segment to be cut off, said collar or flange being joined to a threaded longitudinal element which extends externally and which is used to remove the cut-off pipe segment. The invention also includes elements for sealing the openings once the cutting operations have been performed and the guillotine has been removed.

Abstract: A drain valve for a vehicle compressed air system, which separates dirt, water, debris and other relatively heavy objects from a compressed air stream. The drain valve includes a sump with a tangential inlet. The tangential inlet creates a vortex within the sump that collects relatively heavy objects at the bottom of the sump and allows the compressed air to exit the drain valve through an outlet port located at the top of the drain valve. A pressure actuated valve and drain port allows for the water to be discharged from the drain valve while retaining the pneumatic signal.

Abstract: An insertable component that is embodied as a non-return element and/or as a through-flow regulator is provided which can be inserted into a gas or liquid line. The insertable component (1) includes a housing (2) formed of at least two housing parts (3, 4). A housing seal (5) is located between the housing parts (3, 4). The housing seal is joined as a single piece to an annular membrane (11), which is used as a closing body for the non-return element, and/or a regulating or throttle body. The insertable component includes a small number of individual parts and is characterized by a compact structure and low production costs.

Abstract: A leak detector pad comprising a circuit board having a bottom surface and a top surface, spaced first and second electrically conductive traces located on the bottom surface, and an electronic circuit mounted on the top surface. The circuit includes a first segment adapted to create an alternating current (AC) voltage waveform, a second segment adapted to apply the AC voltage waveform between the traces on the bottom surface of the circuit board, a third segment adapted to create a measure of a capacitance between the traces based upon an AC current flowing between the traces as a result of the AC voltage waveform, and a fourth segment adapted to create a direct current (DC) voltage alarm signal if the measure of capacitance provided by the third segment indicates the presence of fluid.

Abstract: A valve assembly may include a main housing and first and second electro-statically actuated valves. The main housing may define at least three chambers, with a first chamber configured to be coupled to a high pressure supply port, a second chamber configured to be coupled to an output port, and a third chamber configured to be coupled to a low pressure exhaust port. The first electro-statically actuated valve may be provided between the first and second chambers, and the first electro-statically actuated valve may allow or substantially block fluid communication between the first chamber and the second chamber responsive to a first electrical signal. The second electro-statically actuated valve may be provided between the second and third chambers, and the second electro-statically actuated valve may allow or substantially block fluid communication between the second chamber and the third chamber responsive to a second electrical signal. Related methods are also discussed.

Abstract: An occlusion valve with safety relief comprising a manifold block having an inlet and an outlet. A diaphragm connected to the manifold block and for being manually pressed to stop flow between the inlet and the outlet. A pressure relief valve internal to the manifold block and in fluid communication with downstream and upstream pressures and wherein when the diaphragm is pressed and downstream pressure exceeds a predetermined pressure the pressure relief valve opens allowing flow through the occlusion valve with safety relief.

Abstract: The present invention relates generally to fluid control valves and, more particularly, to a mixing valve for use within a faucet.

Abstract: The Invention relates to an upwardly and downwardly discharged faucet for comfortable use, comprising a main handle and a main valve body. The main valve body is provided with a diverting valve with dual ports. The diverting valve comprises a valve seat mounted on the main valve body. On the bottom side wall of the valve seat are disposed a left inlet and right inlet which are in communication with a main conduit, respectively. Within a chamber is disposed a diverting valve core, in which an upper water conduit and a lower water conduit are disposed. The upper water conduit is in adjustable communication with the right inlet; and the lower water conduit is in adjustable communication with the left inlet. The outlet of the lower water conduit is in communication with the bottom of the chamber. On the upper end of the diverting valve core is provided a rotary valve stem.

Abstract: A feeder terminal connected to the core wire of the feeder cable is installed in the storage chamber of the terminal storage box, and the feeder cable and the feeder terminal are gripped to be fixed between the terminal storage box and the lid such that the feeder socket is assembled. The feeder socket is inserted into the socket hole formed in the terminal cover to connect the feeder terminal to the power receiving terminal communicated with the electromagnetic operation unit.

Abstract: A user input device is provided for a hydraulic system that has a source of pressurized fluid and a tank. The user input device includes a body with a supply passage for receiving the pressurized fluid, a tank passage for connection to the tank, and a first chamber. A handle is pivotally attached to the body and operates one or more valves within the body. In a preferred embodiment, the handle can be pivoted independently about two orthogonal axis with separate pairs of valves operated by movement about each axis. In response to the position of the handle, each valve connects a separate chamber alternately to either the supply passage or the tank passage and different pressure sensor produces an electrical signal indicating a level of pressure in the chamber of each valve. Thus an electrical signal is produced from each valve to indicate motion of the handle.

Abstract: A user input device is provided for a hydraulic system that has a source of pressurized fluid and a tank. The user input device includes a body with a supply passage for receiving the pressurized fluid, a tank passage for connection to the tank, and a first chamber. A handle is pivotally attached to the body and operates one or more valves within the body. In a preferred embodiment, the handle can be pivoted independently about two orthogonal axis with separate pairs of valves operated by movement about each axis. In response to the position of the handle, each valve connects a separate chamber alternately to either the supply passage or the tank passage and different pressure sensor produces an electrical signal indicating a level of pressure in the chamber of each valve. Thus an electrical signal is produced from each valve to indicate motion of the handle.

Abstract: A faucet including a faucet head, a body and a magnetic coupling releasably coupling the faucet head to the faucet body.

Abstract: A diverter for arrangement in a pipe, a barrel or a tower, and including an even number (?4) of conical cavities arranged annularly, all of the conical cavities converging at the center of the diverter. The intersection point of the axial lines of the odd numbered conical cavities and the intersection point of the axial lines of the even numbered conical cavities are located at both sides of and symmetrical about the center of the diverter. As fluid flows through the diverter, the fluid material in the central fluid and edge zones interchange position and produce three-dimensionally intersecting flow. The diverter can efficiently improve the effects of heat and mass transfer, and can be widely used in static mixers, heat exchangers for fluid with high viscosity, temperature homogenizers of the exit of the screw extruder, high efficiency pipe reactors, and in the occasions of fluid-fluid extraction, solid-fluid extraction, etc.

Abstract: A method of inserting a cured in-place pipe from a cleanout includes positioning a lining along a portion of a length of a bladder, wherein the lining is frangibly connected to the bladder, inserting the bladder through the cleanout, to a position wherein the lining is within the pipe and does not block the pipe.

Abstract: A tube which includes: a tube body portion through which a fluid flows; a protector portion having an interior hollow space in which the tube body portion is provided, and an exterior wall defining the interior hollow space and having a flat outer surface; and a supporting portion supporting the tube body portion inside the hollow space in a position spaced from an inner surface of the hollow space. The supporting portion extends from the exterior wall of the protector portion in a direction substantially perpendicular to the flat outer surface of the exterior wall and across the hollow space to support the tube body portion at a middle portion thereof.

Abstract: Connecting ends on a hose piece comprising several metal layers, in particular a strip wound metal hose piece, are produced by fixing the overlapping metal layers of a hose of larger length or of an endless hose in the region of the point of separation through welding and subsequently cutting off the hose piece from the longer hose or the endless hose. For simple and inexpensive fixing of the metal layers in the region of the point of separation, a welding seam is generated which extends through at least part of the periphery of the hose or about its entire periphery, using roller seam welding. The hose piece can subsequently be separated along the welding seam obtained in this manner, e.g. along its central line, thereby ensuring permanent and reliable fixing of the metal layers in the region of the connecting end.

Abstract: A method and a clamping device for clamping a weft thread in a jet weaving machine are proposed. The weft thread strand runs through the beginning section (2.1) and the end section (2.2) of a mixing tube. The two sections between themselves form an engagement opening (8) and are connected with a first holding magnet (11) by a counter support (9). An actuator (6) in the form of an elastomeric bellows, which comprises a chamber (10), is located on the beginning section (2.1) of the mixing tube. The chamber (10) is connected to a valve (16) via a supply line (20) and is acted on variably with compressed air. By deformation of the actuator (6), a clamping element (7) connected thereto carries out a tilting movement between the counter support (9) and a contact stop part (19), which contains a second holding magnet (12). The holding magnets (11, 12) lead to an exact and reliable clamping of the weft thread (3).

Abstract: An automated medication preparation system for preparing a prescribed dosage of medication in a drug delivery device includes a plurality of stations for receiving, handling and processing the drug delivery device so that the prescribed dosage of medication is delivered to the drug delivery device and a transporting device that receives and holds more than one drug delivery device and moves the drug delivery devices in a controlled manner from one station to another station. The system is configured so that two or more separate drug delivery devices can be acted upon at the same time.

Abstract: This invention relates to a method for filling particulate material in vertical tubes (1) where the velocity of fall of the material (4) is reduced by having it glide down a rotating spiral duct (2) or by gliding down a rotating inner tube (5) with openings above the bottom (6) through which the material can fall out. The inner tube (5) is filled with the particulate material (4). After the material has fallen out of the spiral duct (2) or the inner tube (5), it can fall towards the tube's (1) wall during the drop onto the top layer of filled material.

Abstract: A product dispensing system includes a receptacle for storing a product, a fill column, and a refill dispenser. The fill column is in fluid communication with the receptacle and is configured for selective and alternative securement to a housing and the refill dispenser. The refill dispenser includes a container configured to transfer a product and a cap assembly extending adjacent to the container. The cap assembly has a fill position. Upon rotation of the cap assembly about the fill column, the cap assembly is moved into the fill position so that the product from the container can be transferred to the receptacle.

Abstract: A system and method for filling hydrodynamic bearings with fluid. The fluid filling system includes a vacuum vessel for receiving the hydrodynamic bearing therein, a pump hermetically connected to the vacuum vessel and exhausting air from the vacuum vessel to the outside, an ultrasonic generator for generating vibrations in the vacuum vessel, and a fluid dispenser for dripping the fluid into the hydrodynamic bearing. When air is exhausted from the vacuum vessel to the atmosphere by the pump, the hydrodynamic bearing is vibrated by the ultrasonic generator and air is exhausted from a micro-gap between the shaft and sleeve of the bearing the atmosphere.

Abstract: A tank (10) for storing a liquid with a device (11, 12) for feeding one or more substances thixotroping the liquid to the liquid in the tank (10) is characterised in that the device (11, 12) is designed so that it feeds the thixotroping substance or substances to the liquid in the tank (10) as a result of a signal from a signal transmitter, so that the liquid completely thixotropes, at least in a closed outer layer inside the tank (10) that cannot be penetrated by a residue of the liquid, not thixotroped if necessary. This ensures that by simple means the liquid present in the tank (10) is pretended from being discharged or from escaping under certain defined conditions, particularly in emergency situations.

Abstract: A device is disclosed which acts to contain the contaminated effluent of an operation such as a hydro-blasting operation. The device has flexible bag for containing the effluent. The bag has an opening interfacing with a vessel being fluid blasted, into which opening the blasting effluent is received. A drain port is positioned on the containment bag to gravity empty the effluent from the interior of the bag, and a vent appropriately located on the containment bag to relieve pressure in the interior space during use and emptying. A flange strap disposed secures the bag opening to the vessel, and a support means is arranged to suspend the containment bag in proper relationship with the vessel. An expansion mechanism can be used to hold the containment bag in an expanded condition to facilitate use of the bag to properly contain the effluent.

Abstract: A device for controlling the filling of a receptacle with liquid by a drink vending machine. The device includes visual marking device for marking the liquid fill level in the receptacle, a device for emitting a signal towards the receptacle, a device for receiving an incident signal and which receives the incident signal returning from the receptacle and a controlling device configured for commanding the stoppage of filling on the basis of a variation of the incident signal. The receiving device includes a series of photoelectric receivers and at least one variable which is a displacement of a light incident signal measured by the receivers.

Abstract: A device for feeding one or more substances thixotroping a liquid to a container for storing said liquid, is characterized in that the device comprises a tank containing thixotroping substances, a feeding means for transportation of the thixotroping substances from the tank into the container which contains the liquid, and a pressure generating means for generating a pressure gradients in the thixotroping substances within the feeding means which is directed from the tank to the container. By means of the device according to the invention thixotroping substances can be fed into fluid within the container, in order to prevent discharging and leakage respectively under certain defined circumstances.

Abstract: A filling valve is provided for filling containers such as beverage cans. The valve includes a tipless nozzle having ports oriented for directing flow. The nozzle includes a removable valve seat having a planar sealing surface. A spring actuated vent seal is provided for closing the vent tube. The valve stem has protrusions for centering the stem in the valve body. The filling valve has a bell forming a cavity between the bell and the valve body, and an aperture for directing cleaning fluid from within the bell to the cavity. The valve body has a duct for directing cleaning fluid from the cavity to an outlet.

Abstract: Petrol Pump Safety Nozzle is a device for petroleum fuel pumps consisting of a retractable sleeve attached to a nozzle. The sleeve moves upward when it engages the perimeter of a petroleum gasoline receptacle. The sleeve is connected to a trigger release to allow the trigger to move and dispense gasoline. To use the preferred embodiment of Petrol Pump Safety Nozzle, a user inserts the device into a petroleum gasoline receptacle opening causing the retractable sleeve to expose the nozzle and to actuate the sliding trigger release to permit the trigger to dispense gasoline. When this device is placed inside a standard diesel fuel receptacle opening, the width of the opening will prevent engagement with the retractable sleeve and fuel cannot be pumped.

Abstract: A liquid storage apparatus provides a safe and easy to use device for efficiently managing liquid reagents used in a variety of laboratory equipment. The liquid storage apparatus helps reduce the likelihood of accidental sticks to laboratory personnel, allows for flexibility of experimental design, and helps maximize the use of chemical regents to prevent waste. The apparatus includes a plurality of containers of liquid with a pierceable septum interface at each end. The apparatus also includes a lower array of needles with each of the lower needles in the lower array of needles arranged to penetrate the bottom pierceable septum of a different one of the containers. Each of the needles includes a passage so the liquid can flow out of the pierced container. The apparatus further includes an upper array of needles with each of the upper needles in the upper array of needles arranged to penetrate the top pierceable septum of a different one of the containers.

Abstract: A filling device for container filling machines including an exchangeable centering socket for a mouth of a container, a bayonet joint for mounting the centering socket to the filling device, and at least one permanent magnet for removably fixing the centering socket in a locked position.

Abstract: The label making apparatus of the invention comprises a guide plate 17 for guiding a raw sheet M in a predetermined feeding direction, an inspecting device 15 for inspecting a label L on a release liner S constituting the raw sheet M, a transfer device 25 for partially bypassing the feeding direction of the release liner to peel off a label from the release liner and temporarily sticking the non-defective label at a position on the release liner advanced toward the downstream side in the feeding direction by a predetermined distance, and a collecting device 22 for collecting a defective when a defective label is detected. The transfer device 25 adjusts the bypass length of the release liner so that a certain interval is kept between the non-defective label after a defective label is detected with respect to the preceding non-defective label.

Abstract: A tooling head for bi-directional tire cord application to an annular surface reciprocates in a forward and a reverse direction across the annular surface. The tooling head includes a housing; a nose block assembly coupled to the housing and reciprocating in an axial direction relative to the tooling head housing; a pair of cord engaging rollers mounted to a remote end of the nose block assembly and moving therewith in a forward and a reverse direction across the annular surface, the rollers positioning at least one cord against the annular surface in the forward and reverse directions; and a biasing element engaging against the nose block assembly for alternatively biasing the rollers against the annular surface.