Abstract: A bandage for dressing a body wound, the bandage including a strip of tape having adhesive on one side thereof, a gauze pad adhered at its center, a foil envelop adhered at one end and containing antiseptic medication, the end of the envelop overlapping on top of the pad and being adhered to one end of a folded over, auxillary, second adhesive tape that covers when the auxillary second tape is pulled off the foil on the tape end causes the medication to automatically squeeze out upon the pad so to be instantly prepared for placing against the wound.

Abstract: The invention concerns a bandage having an applicator attached to the backing of the bandage and disposed to extend vertically from the top surface of the bandage to permit pressure to be applied downward against the backing or the centrally disposed absorbent pad of the bandage. Advantageously, a swab of impregnated absorbent material in a package is attached to the remote end of the applicator. The applicator can be one or more rigid strips of material attached to the bandage backing or a rigid, hollow tube dispose vertically over the central portion of the bandage.

Abstract: A disposable re-breathing apparatus for use with hyperventilating patients has a disposable, flexible polymer bag which attaches to a nose/mouth mask and an air control valve located between the mask and the disposable bag which adjusts the ratio of re-breathed air to fresh air through a fresh air inlet. The fresh air inlet has a check valve preventing exhaling air therethrough and a pressure relief valve may be provided to release re-breathed air when the polymer bag becomes filled.

Abstract: The assembly, through a plurality of shunts, allows blood circulation from the lower part of a patient's body and from the intestines to flow unimpeded to the heart, while isolating hepatic venous blood containing toxic agents from the general circulation and returning it to a heart-lung machine. As a result, the assembly can be used to perfuse the liver, of a patient which has become involved with cancer, with extremely high does of cancericidal chemotherapy agents, while at the same time avoiding the toxic effects of these agents on the patient's body as a whole.

Abstract: A flow regulating device provides continuous, regulated flow of a medical fluid, as well as intermittent, manually controlled larger flows of fluid to a catheter system. Such apparatus includes a control member having an inlet means adapted to be connected by tubing to a source of medical fluid and an outlet means adapted to be connected by tubing to a catheter. A flexible conduit defines at least a portion of a first passage between the inlet means and outlet means of the control member. Positioned in the flexible conduit is valve means adapted to open when the conduit is squeezed, thereby providing the larger, intermittent, manually controlled flow of fluid to the catheter system, and to automatically close when the conduit is released. A second passage in the control member connects the inlet and outlet means, and in combination with flow restriction means therein, provides the continuous, regulated flow of fluid to the catheter system.

Abstract: An intravenous catheter assembly for use in the administration of fluids to a patient includes a compressible, flexible hub having a bore therethrough. One end of the bore is adapted to receive a hollow tube such as an intravenous catheter so that fluid is flowable through the bore and the tube. A pair of generally oppositely extending wing sections is connected to the hub, at least one of the wings being hingedly connected to the hub to allow that wing to fold over the hub. On the hingedly connected wing is a pinching protuberance for contact with the hub when the wing is folded thereover whereby, in use, the folded wing urges the protuberance against the flexible hub causing it to collapse and occlude the bore and thereby restrict fluid from passing therethrough.

Abstract: A needle-inside, catheter placement assembly including a needle and a catheter unit comprising a catheter, winged catheter insertion means, flexible tubing and tube hub, wherein axial and rotational alignment of the needle and catheter unit are maintained by mechanically interlocked complementary means associated with the needle and lumen of the winged catheter insertion means. Means for removably connecting the proximal ends of the catheter unit and needle to stretch the flexible tubing tautly are also provided.

Abstract: A needle-inside, catheter placement assembly including a spliced, two-part needle and a catheter unit comprising a catheter, winged catheter insertion means, flexible tubing and tube hub, wherein axial and rotational alignment of the needle and catheter unit are maintained by mechanically interlocked complementary portions of the needle and lumen of the winged catheter insertion means.

Abstract: A pacifier for infants, having a nipple provided with a chamber, the wall of which has perforations. In use, the chamber is supplied with flavored sweets such as pellets of candy, of frozen fruit juices. When the nipple is then placed in the infant's mouth, saliva therein circulates through the perforations thereof and the resulting sweetened fluid flowing therethrough encourages the infant to retain the nipple in its mouth and not eject it.

Abstract: A self-powered device for dispensing a medicament is disclosed. The device comprises (1) a rigid housing defining an internal space, (2) a container in the housing formed of a stretched polymer and having a passageway connecting the container with the exterior of the device, (3) a medicament in the container, and (4) an expandable laminate surrounding the container position between the interior of the housing and the exterior of the container. The laminate comprises (a) a lamina of an absorbent material laminated to (b) a lamina of a swellable, hydrophilic polymer. In operation, when the device is in a biological fluid environment, fluid therefrom is imbibed by the laminate into the housing, causing the laminate to expand and exert pressure on the container, thereby shrinking the container to an unstretched state, which decreases its volume and concomitantly pumps medicament through the passageway at a controlled rate over time.

Abstract: A breath-actuated inhalation device for dispensing a powdered medicament from a powdered medicament-holding capsule, comprising an elongate housing having a passageway for the movement of air therethrough, one end of the housing being an output end adapted for insertion into a user's mouth or nasal passage, the passageway having an inlet end terminating in an emptying chamber at the output end of said housing, the cross-sectional area of the passageway being less than the cross-sectional area of the emptying chamber, and means associated with said housing for receiving a powdered medicament-holding capsule. A collar surrounds at least a portion of the periphery of the housing adjacent the emptying chamber and has at least one substantially flat surface with a notch therein, which allows a first, smaller part of a two-part capsule to fit therein but which is too small to allow the second, larger part of the capsule to fit therein.

Abstract: A device intended for flue gas passages includes a pivotable damper plate which is connected to a regulating device for automatic adjustment of the damper plate between a closed position and an open position in response to the operating condition of an installation connected to a flue gas passage. Adjustment is effected with regard to the economical operating position to prevailing outside wind conditions. An anemometric chamber with an associated diaphragm is arranged to be actuated by the gas pressure in the flue gas passage downstream of the damper plate and is connected to the damper plate in such a way that the degree of opening of the damper plate in the economical operation position is decreased for decreasing gas pressure in the flue gas passage.

Abstract: A disposable article comprises a translucent sheet of substantially water impervious material and a moisture absorbent pad associated with the sheet. Also, a visual indicator is located proximate the sheet, and a mask is located between the indicator and sheet, the mask characterized when dry as masking the visibility of the indicator through the sheet, and further characterized when wet as unmasking the visibility of the indicator.

Abstract: A patch-like web of material adapted to be placed over skin tumors for aiding a physician in making an optimum size and shape incision when surgically removing the tumor. The web of material is provided with an opening having a predetermined size which correlates with the size of the tumor. Also included are delineation provisions for providing a pattern which prescribes the optimum size and shape for the particular incision.

Abstract: A forceps constructed of a pair of interconnected members in which the fore end of the pair of members each include a plurality of elongated grooves. The elongated grooves of the members are to cooperate together to facilitate clamping onto a Laminaria tent for insertion into the uterine cervix of a human female. In the longitudinal direction the grooves are inwardly tapered. The upstanding sidewalls separating the grooves assure a positive lock onto a variety of diameters of Laminaria tents.

Abstract: A surgical instrument comprises two elongate members which are pivoted together intermediate their ends in crossing relationship, so as to define a major plane extending substantially perpendicular to the axis of pivotal movement of the members and in which the members move during relative pivotal movement thereof. Each member has at one end an operating portion which cooperates with the operating portion of the other member when the two operating portions are brought together by relative pivotal movement of the two members. Each member has at its opposite end an actuating key which can be urged towards the actuating key of the other member for bringing the operating portions into cooperating disposition. Each actuating key comprises a substantially rectangular plate which extends transversely to the major plane of the instrument whereby force can be applied to urge the actuating keys together.

Abstract: This disclosure relates to a clip for surgical purposes comprising a coil spring having at least one loop and a pair of crossing legs. The ends of the legs which extend beyond the crossing point are formed as clamping jaws. Because the portions of the legs adjoining the loop extend generally parallel to one another and the ends of the legs run side-by-side, and because a ring is provided at the crossing point for holding the legs together, the clip can be constructed with such small dimensions that it is particularly advantageously useful for neurosurgical purposes.

Abstract: A programmable digital atrio-ventricular pacer is provided whereby a single programming circuit is utilized for providing program control signals for control of separate ventricular and atrial pacing circuits. The atrial stimulus circuitry is controlled by a multiple bit control signal to cause derivation of atrial timing signals from the same clock signal as used for deriving ventricular stimulus pulses. A programmable digital multiplier is employed in combination with a counter to set the atrial escape interval independent of the timing of the ventricular stimulus pulses.

Abstract: An indentation tonometer is contained within a hand holdable housing below which extends a foot plate and a movable plunger. An optical encoder is disposed within the housing and has a ruled scale that is fixed relative to the foot plate and an adjacent ruled scale that is movable relative to the fixed scale. The movable scale engages an upper surface of the plunger and is elevated to a position corresponding to the position of the plunger relative to the foot plate as intraocular pressure is measured. Components for the optical encoder are arranged within the housing to produce a digital readout. The foot plate and plunger are preferably arranged in a subassembly that is vertically movable relative to the housing with suitable switches arranged for detecting when a reading is completed and for automatically calibrating the instrument on the test block.

Abstract: A method and improved apparatus for automatically locating the QRS portion of an electrocardiographic signal and for generating a corresponding synchronization pulse is disclosed. Properties associated with the QRS portion of an electrocardiographic signal are utilized in the implementation of an adaptive peak detector capable of accurately operating with electrocardiographic signals varying in amplitude or polarity. The adaptive peak detector is also capable of discriminating against signal components lying outside certain predetermined limits.

Abstract: This invention relates to a clinical wick catheter and to a technique for measuring tissue fluid pressure and also collecting tissue fluid by the catheter.A catheter tube has a wick positioned in one end which is drawn into place by a monofilament tether extending through the catheter tube. In use, a sheathed placement needle is first partially inserted beneath the skin and fascia of the subject patient; the needle is partially retracted into the sheath; the assembly is then further inserted into the muscle tissue of interest. The needle is then withdrawn and replaced by the catheter which is inserted, wick first, through the sheath until the wick resides in the tissue region of interest. Thereafter, the interstitial fluids soak into the wick and the pressure transmitted through the catheter via the medium of a saline solution which fills the catheter. The outer end of the catheter is connected to pressure (negative or positive) measuring equipment, such as a manometer.

Abstract: An adapter for use in accommodating a syringe with a reduced diameter open ended tip for use with a blood collecting needle so as to facilitate coupling of the syringe and needle and collecting of a sample of blood through the needle into the syringe. The adapter includes an elastomeric, pierceable, self-sealing member having a head portion and a body portion extending from one side of the head portion. A recess is located in the body portion conforming with the shape of the reduced tip of a syringe and is adapted to be mounted on the tip and close the open end thereof. A guide is on the head portion to assist in guiding the needle into alignment with the open end of the tip so that when the needle pierces the head portion it will extend through the open end of the tip into communication with the interior of the syringe to permit collection of a blood sample therein. The self-sealing head portion is adapted to reseal and close the open end of the reduced tip after the needle is removed therefrom.

Abstract: An improved tooth displacement measuring apparatus for measuring the displacement of a test tooth in response to particular applied forces. A zero value selector automatically adjusts the measured values of tooth displacement with respect to a reference calibration displacement defined by the displacement measured in response to a calibration force. The measured values of displacement corresponding to the particular applied forces are stored and selectively displayed.

Abstract: The rotor of an axial flow rotary separator carries a series of circumferentially spaced threshing bars which move in a threshing relationship with a cylindrical threshing grate as the rotor rotates and are characterized in having upstream and downstream portions, respectively providing greater and lesser grate clearances, the greater clearance of the upstream portion facilitating the entry of material into the threshing section of the separator.

Abstract: An improved apparatus and method for bulk curing tobacco in which the temperature conditions in the tobacco curing barn are automatically controlled by heating the air being circulated through the barn in a controlled manner to maintain a predetermined differential in the dry bulb temperature of the air entering and leaving the curing chamber.

Abstract: A process for constituting a large surface of natural tobacco, in particular for making cigar wrappers comprising the steps of:(a) stripping the biggest rib of natural tobacco leaves;(b) dividing each leaf into two half-leaves;(c) arranging the half-leaves in a plane in succession along a continuous row in such a manner that the rectilineal side of each half-leaf corresponding to the removed rib is orientated in a fixed direction, transverse to the longitudinal axis of the large surface of tobacco forming said row, that said half-leaves are adjoining each other, that the remaining ribs are in relief on the same side of the plane and have the same orientation;(d) covering with tobacco fragments the areas between the half-leaves where the tobacco is missing;(e) maintaining all the leaf fragments in their respective arrangement.

Abstract: A compact light-weight axial-flow type hair styling appliance incorporates improved bayonet mountings between respective body housing portions of the styler, and between the air outlet port of the styler and styling attachments which are removably affixable thereto. The styler-housing bayonet mounting includes a resilient arm extending from one of the bayonet mounting members which biases the mating bayonet mounting member in a rattle-free engagment. Additional detent-indent engagement between the respective bayonet mounting members locks the styling attachment in place on the styler housing until removal of same is accomplished by a quick twist in either direction of the attachment mounted to the housing.

Abstract: Disclosed is a hair styling brush in which the brush portion is axially rotated by finger motion of the operator grasping the handle. The operator actuates a trigger or abutment in the handle to rotate the brush while the handle remains stationary in his grasp as he draws the brush through the hair. Rectilinear movement of the abutment is translated into rotary motion of the brush by a rack and pinion transmission means located within the housing forming the implement handle.

Abstract: In curling the hair, strands of hair are wound round an apertured cylindrical roller and secured thereon until set. For securing the wound strands, an arm mounted on a slider within the roller is movable from an axial withdrawn position in which it is clear of the wound hair, to a holding position in which it overlies and holds the hair against the roller. The arm can be moved to a stored condition within the roller. A preferred embodiment has a spring-loaded clip operable by grasping handle portions between finger and thumb.

Abstract: A curling iron has a barrel and a hair-clamping arm pivotally mounted thereon for movement between an elevated position in which it projects angularly and forwardly relative to the barrel and a lowered hair-clamping position in which it is disposed alongside the barrel. A sleeve extends around the barrel and can be rotated and/or moved axially to cause movement of the hair-clamping arm into its elevated position against the action of a spring biassing that arm into its lowered position.

Abstract: A portable dressing table or vanity comprising a deformable base adapted to assume the contour of the user's lap or knee or on a table. Surmounting the base and secured thereto is a holder having a drawer, flanked by lidded boxes. A mirror mounted between the boxes is foldable into a cavity in the top of the holder. The vanity can be used while watching TV or by bedridden persons or while traveling.

Abstract: A holder for dental floss to be used in conjunction with a disposable cartridge on which the floss is mounted. The holder in one embodiment is an oblong handle having two spaced apart resilient substantially parallel legs which depend from a junction at one end of the handle. The one end of the handle has a bifurcated extension beyond the junction, and portions of the two legs are adjustably engaged with each other so that when the two legs are moved towards each other, the arms of the bifurcated end of the handle are stressed and spread apart from each other. An element including a length of dental floss is mounted on the bifurcated end of the handle so that when the arms are spread apart, the length of dental floss becomes rectilinear. The element typically is a cartridge having a U-shaped resilient frame. The length of dental floss extends between the opposed ends of the frame.

Abstract: An improved electroplating apparatus comprises a nonlinear array of treating tanks having a central rinse tank. A hoist motor is located on a fixed support structure above the rinse tank. A traversing guide engages a hoist cable to move the cable around the array of treating tanks. An insulating canopy surrounds the array to conserve waste heat given off by any heated treating tanks. A plurality of shower nozzles is located around the rinse tank for rinsing off any articles carried thereto by the hoist cable. The rinse water is heated by the waste heat conserved by the insulating canopy. The rinse discharge from the rinse tank can be conducted to a concentrating device for concentrating any contaminants contained in the rinse discharge.

Abstract: The specification discloses a liquid storage tank of the silo-type having spray cleaning apparatus for cleaning internal surfaces located in the lower portion of the tank and also cleanable venting and overflow conduits associated with the cleaning apparatus. The specification also describes a method for cleaning internal surfaces of the tank and its various conduits using spraying apparatus positioned at or near the bottom of the tank.

Abstract: In a tent of the type wherein a tent body or proper is suspended from tent poles to pitch the tent; a structure wherein a cord, tape or the like is placed along a ridgeline formed on the upper surface of the tent proper, or the like, wherein portions for mounting the cord, tape or the like and the tent proper are disposed at intervals, thereby to form loops, and wherein engaging portions such as hooks are formed on the tent proper between the adjacent mounting portions. Further, in a tent of the type wherein a tent proper is suspended from tent poles to pitch the tent; a structure wherein mounting portions and engaging portions are alternately formed on ridgelines on the upper surface of the tent proper, wherein a cord is inserted through the mounting portions lying on the identical ridgeline, wherein loops formed of the cord between the adjacent mounting portions are caused to stride a tent pole, and wherein the loops are engaged with the engaging portions.

Abstract: A collapsible dome-shaped frame for a tent or similar structure includes a polygonal top ring formed of alternating fixed and pivotal sections, with a foldable, arcuate leg or pole connected to each pivotal section. In the collapsed condition of the frame, the poles extend downwardly, substantially at a right angle to the plane of the top ring forming a barrel-shaped cage for carrying a tent and groundsheet. In order to open the frame, the poles and each pivotal section are rotated relative to the fixed sections of the top ring, so that the poles extend outwardly from the top ring in the same plane as such ring, and the pivotal sections are locked in the open position. The poles, which are formed of arcuate segments interconnected by self-locking hinges, are unfolded to the open position, in which they define the dome-shaped frame with the top ring.

Abstract: A sprinkling apparatus powered for movement along a row of spaced risers. It is guided along a path parallel to the risers without any physical guidance being provided in the spaces between them. A coupler engages each successive riser and selectively completes a hydraulic circuit between the riser and the sprinkling apparatus. Mechanical indexing and engagement of the coupler relative to the riser is used as a guide for modifying the direction of movement of the sprinkling apparatus in order to permit engagement of the next successive riser by the coupler. All functions of the sprinkling apparatus are automatically sequenced upon engagement of selected risers. Alternate risers can be skipped. Reversal of the sprinkling apparatus can be achieved by placement of stop mechanisms along the row of risers.

Abstract: A noise-reducing jet engine air inlet duct contoured to control air flow such that sound waves (noise) propagating upstream from the engine toward the entryway of the air inlet duct are refracted to the duct wall and/or engine inlet centerbody is disclosed. The inlet duct wall and/or engine inlet centerbody are contoured to establish a cross-sectional duct region having substantial airflow velocity gradients in a direction transverse to the direction of the airflow. Starting at the inlet duct entryway, the contoured duct region includes a parallel or diverging section followed by a rapidly contracting section before a final diffusion section extending to the engine. The velocity gradients created in the region of the contracting section refract the sound waves toward the wall and/or engine centerbody of the air inlet duct.

Abstract: An improvement to a priority valve which provides priority flow to a priority function, not only directly from a fluid power source, but also from an accumulator when the priority demand exceeds the output of the fluid power source. This priority flow valve also provides flow to one or more secondary functions when the priority flow requirements are satisfied or when the priority flow path is blocked.

Abstract: A hydraulic lock-out device for use with a hydraulic motor or jack that permits smooth operation of the piston and ram of the hydraulic motor during the working stroke and return stroke without surging or interruptions, and is operative to isolate the hydraulic motor from the fluid system when the ram is still and under load. A check valve associated with a first chamber of the device is operable to admit fluid under pressure to a first end of the hydraulic cylinder to move the piston from the first end toward the second end of the cylinder during a working stroke. A second valve associated with a second chamber of the device admits fluid to the second end of the cylinder for the return stroke of the piston and ram.

Abstract: A valve assembly for use in inflating a chamber which comprises two independent subchambers separated by a flexible wall utilizes a single fluid inlet with a valve member controlling communication to the subchambers. The valve member comprises two pivotable portions which move downstream to split the inlet flow to fill each subchamber independently.

Abstract: In an agricultural irrigation system comprising an elongate wheel line having an elongate, essentially rectilinear, central, water conveying conduit and a series of wheels keyed to and supporting such conduit; the inclusion in said irrigation system of a master or propulsion unit for advancing the line in a direction transverse to the orientation of the central conduit thereof and a series of torquing units or torque booster units mutually spaced along and coupled to said line for applying torque at a series of points remote from the master unit. Each unit may be provided with means for speeding up, slowing down, and stalling out such unit in accordance with requirements for changing the operating conditions of each unit in order to keep the wheel line essentially straight.

Abstract: A float actuated valve mechanism for automatically removing a predetermined amount of accumulated liquid condensate from a sump area of a gas pressurized drain trap or the like so as to regulate the level of liquid in such a sump area. A four-bar linkage between a float and a valve plug provides a non-linearly varying mechanical advantage throughout the movement of the float. In a closed position the valve plug mates with a rigid seating surface and an elastomeric seating surface to provide a wear-resistant seal.

Abstract: A valve connects the duct leading from a process pipe to a flow transmitter, pressure gauge or sampling analyzer. The valve stem of the valve is hollow and aligned with the duct through the connection to process fluid. A cleaning rod is telescoped within the hollow stem so that it may be forced through the duct to clean debris from the duct. Also the valve handle has capstan holes therein for mechanical advantage. Furthermore, a bonnet valve seat is used so that the bonnet packing may be removed while the equipment is pressurized.

Abstract: The housing of a pressure-relief valve has an inlet port forming an inlet valve seat, an outlet port, a valve chamber between the ports, and an abutment in the valve chamber. A valve body in this chamber has an inlet end engageable in the inlet valve seat and an outlet end, and is displaceable in the housing between a closed position with its inlet end seated in and blocking the inlet valve seat and an open position engaging the abutment and with its inlet end spaced from the inlet valve seat. A pilot piston in the valve chamber has a throughgoing passage opening at one end at the outlet port and forming at its opposite end an outlet valve seat engageable with the outlet end of the valve body. This piston is itself displaceable in the housing between an open position with its outlet valve seat spaced from the outlet end of the valve body in either position thereof and a closed position with its outlet valve seat engaging and blocked by the outlet end. A spring urges this piston into the closed position.

Abstract: An automatic emergency stop apparatus which prevents counter flow and counter fire of gas bodies. The apparatus comprises a check valve, a cut-off valve and a filter unit. The check valve is positioned in the gas inlet portion of a decomposable closed-type valve casing. The check valve is opened only by inflow gas pressure. The cut-off valve engages with a portion of a safety apparatus operated by counter pressures created during counter flow and counter fire conditions. The safety apparatus causes the cut-off valve to automatically stop the flow of gas upon the application of counter pressure. The cut-off valve is positioned in the apparatus gas outlet. The filter unit, which is adapted to buffer the counter pressures caused during the production of the counter fire and to remove carbon sludges, is interposed between the check and cut-off valves.

Abstract: A sealed type hydraulic reservoir including a casing for storing brake fluid therein, a cap member detachably mounted on the casing and an elastic diaphragm member dividing the casing into upper and lower chambers. The lower chamber is defined by the diaphragm member and the liquid surface, and the pressure in the lower chamber is always maintained at the level of atmospheric pressure by two check valves, one for allowing the air flow from the upper to the lower chamber when the pressure in the lower chamber drops below the atmospheric level and the other for allowing the air flow from the lower to upper chamber when the pressure in the lower chamber rises above the atmospheric level.

Abstract: A control valve is provided between a direction-changeover valve and an actuator in a fluid-pressure operating system. This control valve includes a body having an inlet and an outlet; a fluid passage interconnecting the inlet and the outlet; a valve body and a valve seat which are cooperative with each other to define a clearance therebetween and positioned within the fluid passage; a spring for resiliently urging the valve body toward a constrictive position to where a diminished clearance is defined between the valve body and the valve seat; and pressure responsive means for displacing the valve body in an opposite direction against the force applied by the spring thereby enlarging the clearance and bringing the valve body to its fully open position. An adjusting rod enabling adjustment of the first position of the valve body is provided, and a pilot piston operates under a pilot fluid pressure applied through a pilot port for forcing the valve body to its fully open position.

Abstract: An improved hydraulic coupler assembly of the type having a base plate which carries fixed and movable blocks. A spring biases the blocks away from one another with one end of the movable block received inside a bore of the fixed block. First and second nipple members are received inside the movable block with one of the nipple members being slidable therein. The other nipple member is releasably locked in the movable block by a plurality of locking balls engaged by a locking rib on the fixed block. A pivot lever member operates on both the slidably mounted nipple member and the movable block to first move the nipple members apart to stop the hydraulic flow therethrough and to then move the movable block towards the fixed block against the force of the spring to unlock the locking balls, whereby the removable nipple member may be easily uncoupled from the movable block. The lever member comprises a cam operative in a slot in the base plate and a pivot plate operable in a groove in the slidable nipple member.

Abstract: A control unit receiving fluid under pressure discharges the fluid in a pulsed manner to a receiver. The control unit has a rotatable sleeve accommodating an axially movable piston. The sleeve and piston have cooperating openings and grooves that control the pulsed flow of fluid from the control unit. The operating position of the piston responds to the pressure of the fluid on the piston and the relative angular orientation of the piston to the fluid discharge openings in the sleeve.