Abstract: A splint device for the spinal immobilization of a patient. The splint includes a central support portion and two pairs of laterally extending flexible wings adapted to extend, respectively, about the head and about the body of a patient and the central support portion is formed integrally with the wings from a synthetic plastics material and is concave on one side. The concavity includes a plurality of stiffening ribs adapted to render the central support portion substantially inflexible. The central support portion may be formed in two parts joined together by a lockable hinge such that the angle of inclination of a head part of the splint to the body part thereof may be selectively adjusted between 0.degree. and 30.degree..

Abstract: The bone nail is provided with a tapered portion having a barbed denticulation and a conical head which has a conical shaped depression at the proximal end for receiving a centering cone of the setting and driving instrument. The instrument carries a movable sleeve at the distal end for engaging and holding the bone nail in alignment with the centering cone during implantation. The sleeve is movable relative to the distal end of the instrument so as to disengage from the conical head of the bone nail to permit removal of the instrument and subsequent replenishment of the instrument with a fresh bone nail. The sleeve includes an expandable distal section for engaging the conical head of the bone nail and a proximal expandable section for engaging about a conical surface of the instrument.

Abstract: A method for repairing a bone fracture with a compression screw assembly is provided. First and second non-resorbable compression members are positioned so that the head portion of the compression screw can protrude from the surface of the second non-resorbable compression member after further compression is effected by the normal healing process. At least the head portion of the screw is formed of a material that resorbs upon contact with body fluids.

Abstract: A modular femoral internal implant system for use in the treatment of femoral disorders resulting from injury, disease or congenital defect includes at least three interconnectable components: (1) an elongated epiphyseal/metaphyseal implant, (2) an intramedullary rod and (3) an angled side plate having an elongated plate portion adapted to be secured to the outer cortical wall and a hollow sleeve adapted to extend into the femur. The epiphyseal/metaphyseal implant can be connected to either the angled side plate or the intramedullary rod. The system may also include an elongated bone plate connectable to the angled side plate, one or more additional epiphyseal/metaphyseal implants of variable length, an additional angled side plate, a distal buttress plate connectable to the elongated bone plate, and a plurality of bone screws of a universal design. Preferably, many or all of the components of the system are made of an inert, resilient titanium-base alloy.

Abstract: A bandage useful, for instance, in medical applications includes a rupturable sheet or strip having encapsulated fluid (liquid or gas). The sheet or strip is disposed between the body portion to be bandaged and the outer surface of the bandage. The sheet or strip ruptues when a predetermined pressure is exceeded, thereby releasing the fluid for indicating that the bandage is applied too tightly. When the fluid is a liquid, such as a dye, the released liquid will stain the bandage. When the fluid is a gaseous substance, the release of the gas will be sensed. When a plurality of strips are used, one strip may contain a liquid and another one a gaseous substance, the strips rupturing at different predetermined pressures.

Abstract: Intermediate a first pressure reducing means (12, 15) reducing the pressure f a pressure source (10) to nearly the external pressure P.sub.A of the diving depth, and the respiratory mask (18) of the diver, there is a flexible first buffer container (16) whose internal pressure is slightly above the external pressure to ensure that a buffer volume of respiration gas is continuously available directly to the diver. A second buffer container (21) is mounted intermediate the respiratory mask (18) and a second pressure reducing means (26, 23) for waste air. The pressure maintained in the second buffer container is slightly below the external pressure P.sub.A so that a specific exhalation volume is permanently available to the diver. To avoid a direct blowing through the respiratory mask, a relief pressure valve (20) only opens responsive to the lung activity of the diver.

Abstract: An improved artificial ventilator is capable of selection or setting of any arbitrary pattern or waveform of the flow rate of inspiration gas. The flow rate of inspiration gas is controlled through an inspiration valve according to an input representative of a flow rate pattern of an inspiration gas with the aid of a micro-computer, whereby a desired flow pattern of inspiration gas is optionally set.

Abstract: A catheter for use in treating tumors is flexible and relatively small in diameter so that it can be inserted interstitially into the tumor mass. A conductor is provided about a length of the catheter and is electrically insulated except for a small length or small lengths thereof which are adapted to be received within the tumor volume. By connecting the conductor to a high frequency power source a heat producing current can be generated through the tumor tissue adjacent the exposed portions of the catheter to damage the tumor cells. One or more temperature sensing devices are included in the catheter and are located adjacent to the exposed conductor or conductors for monitoring the temperature of the adjacent tumor tissue. The signals from these devices, which are picked up from a connector at one end of the catheter, can then be used to control the current to the conductor or conductors so as to maintain the tumor volume at a constant and uniform desired temperature.

Abstract: Disclosed is a laser spot projector for use with a laser coagulation system in which a laser beam is radiated as a focussed spot into a portion selected to be thermally coagulated. A laser source produces a laser beam, and a focussing lens focusses the laser beam on the selected portion in the form of a focussed laser beam spot. A variator lens is displaceably arranged between the laser source and focussing lens for changing the magnification of the laser spot depending upon the displacement of the variator lens. The variator lens is selectably displaceable to two separate positions where the image point is conjugated with the object point with respect to the variator lens. This arrangement makes it possible to selectably provide two focussed laser beam spots each having a different spot diameter.

Abstract: A resectoscope comprising a sheath body having an elongated hollow sheath to be inserted into a urethra, a handle having a guide part for guiding an optical sighting tube and a slider sliding in the axial direction along the sheath body. An optical sighting tube for observation is inserted through the guide pipe of the handle and is inserted within the sheath. An electrode inserting hole is provided in the slider and opens on the front surface of the slider and an electrode device removably inserted and connected in the electrode inserting hole, is inserted within the sheath. The electrode has a tip electrode which projects out of and retracts into the sheath by means of the movement of the slider in the axial direction. A step is formed between the guide pipe and the electrode inserting hole on the front surface of the slider, the step having the step surface connecting the two surfaces forming the step.

Abstract: An expandable intraluminal vascular graft is expanded within a blood vessel by an angioplasty balloon associated with a catheter to dilate and expand the lumen of a blood vessel. The graft may be a wire mesh tube, having a biologically inert coating thereon.

Abstract: A cardiac pacer, which generates pacing pulses at a predetermined basic pacing rate, includes a device for sensing physical activity and for generating a control signal dependent thereon, a device for varying the predetermined basic pacing rate independent on the control signal and a device for forcing the pacing rate back to a lower rate if the pacing rate runs at or above a predetermined high rate for a predetermined time period.

Abstract: An interlock system for use with anesthesia equipment or other apparatus for monitoring a person's arterial blood pressure and the level of oxygen saturation in the person's blood and for providing respective blood pressure and oxygen saturation signals indicative thereof. The apparatus also comprises inflatable cuff means for disposition about the upper arm of the person to provide the blood pressure signal and a probe for securement on the finger of the person to provide the oxygen saturation signal. The apparatus further comprises alarm means coupled to the cuff means and to the probe means for providing a blood pressure alarm signal in the event that the monitored blood pressure signal deviates from a predetermined value and for providing an oxygen saturation signal in the event that the value of the monitored oxygen saturation signal deviates from a predetermined value.

Abstract: An optical fiber carries a light beam through a cardiovascular catheter and projects the beam into the patient's bloodstream. Two other fibers, spaced in a very carefully controlled configuration from the first, receive light scattered by corpuscles (and blood-vessel walls) and transmit this reflected light back through the catheter to respective detectors outside the patient's body. If preferred, two input fibers and a single output fiber--or other techniques for providing differential geometry--may be used instead. Electronic instrumentation finds the ratio of the two light fluxes, thus cancelling out unknown variables such as input light intensity and optical--connector attenuation. The known differential geometry between the two light paths permits calibration of the ratio measurement in terms of corpuscular concentration--i.e., hematocrit. Light at only one wavelength suffices for the measurement. Advanced forms of the invention correct for proximity of blood-vessel walls.

Abstract: A nuclear magnetic resonance tomography apparatus has coils for respectively generating fundamental and gradient magnetic fields in which an examination subject is disposed, and RF coil for displacing the nuclear spins of the examination subject from an equilibrium position, and direct galvanic connections to the examination subject for obtaining the nuclear magnetic resonance signals arising during relaxation of the excited nuclear spins. The examination subject thus becomes a part of the reception antenna or the feed line thereof, thus avoiding the use of an RF coil for acquiring such signals.

Abstract: During ultrasound checking of the results of lithotrity performed on biliary calculi, it is difficult to distinguish a calculus from crush. This problem is mitigated in accordance with the invention in that the ultrasound transducer (6) used for performing the ultrasound observation first receives a comparatively high electric power for a comparatively long period of time. As a result, the biliary calculus (4) or the crush is stirred up in the gallbladder (3); the size of the particles can be determined from the differences in behavior during settling in the gallbladder.

Abstract: A disposable blood pressure transducer system for use with a catheter with or without a catheter flush/flow valve. The transducer housing has both electrical and fluid connections, with the electrical connections being protected from contamination by fluid.

Abstract: An electronic blood pressure meter including a cuff, a pressure system for pressurizing and evacuating the cuff, a pressure sensor for detecting the pressure within the cuff, a pulse wave parameter extraction circuit and a blood pressure determining circuit. The pulse wave parameter extraction circuit extracts the maximum level difference in the pulse wave component of the cuff pressure over a certain time intervals and also provides pulse wave maximum and minimum values corresponding to the maximum and minimum values of the pulse wave components over each of the time intervals chosen. The electronic blood pressure meter may also include circuitry for finding maximum and minimum values on each of the higher and lower cuff pressure sides of the cuff and deriving blood pressure measuring readings therefrom.

Abstract: Such representations may include the average frequency value of electroencephalographic signals, the logarithm of the power of electromyographic signals, and eye movement indications from electrooculographic signals. Criteria for dividing the records of such representations in the system into stages of sleep can be set by a system operator reviewing these records based on accepted stage definition rules. In addition, transient events such as sleep spindles, etc., in these records can be selected therefrom by criteria set by the system operator also based on accepted rules therefor.

Abstract: An improved instrument for obtaining tissue samples for biopsies is adapted to permit accurate samples to be taken with one-hand. The instrument includes a housing which fits into the palm of the physician's hand and has a guide tube projecting from the forward end which the physician guides to a point from which a sample is required. A spring-loaded cannula is telescoped within the guide tube and a notched sampling stylet is telescoped within the cannula. The tips of the cannula and stylet project slightly from the distal end of the guide tube. An arming slide is provided which is moved forward by the physician's thumb, advancing the stylet into the tissue and cocking the spring-loaded cannula. The physician's thumb then operates a spring release trigger causing the cannula to snap forward, cutting the tissue sample in the stylet notch. The instrument is then withdrawn from the tissue.

Abstract: The device comprises a substantially cylindrical support member which carries or in part defines an inflatable cuff. The cuff extends for only a portion of the length of said support member. Means are provided for inflating the cuff with air and transmitting changes in pressure within the cuff to a display device such as a pressure gauge.

Abstract: An apparatus for accurately determining motion of a jaw without restricting its natural motion is disclosed. The apparatus comprises upper and lower jaw motion elements, at least two sensors and a phase detecting circuit. The sensors detect a phase of an alternating current induced within them.

Abstract: A tubular device for the treatment of hollow organs is flexibly arranged and comprises a coating of silver. This coating is connected to a current source via connecting wires. Particularly, the tubular device is used for the treatment of the esophagus, and by the irritation caused by the electric current it is to effect an inflammation of the esophagus wall and thus a thickening of the latter so as to reduce the danger of hemorraghes of varicose veins within the esophagus or to prevent the hemorraghes. The tubular device is expansible in order to secure a close abutment of the silver coating against the mucous membrane of the esophagus.

Abstract: An electrode (10) adapted for external heart stimulation, and a connector (52) therefor. The electrode includes a first conductive member (14) having a sheet-like configuration and an area resistivity of at least 0.003 ohm-cm.sup.2, and a second conductive member (16) having a sheet-like configuration, and having one surface in contact with the first conductive member and a second surface adapted to engage the patient's skin. Current is introduced at a centrally located portion of the first conductive member. The second conductive member has an area resistivity greater than the area resistivity of the first conductive member, such that the first conductive member acts as a distributor to distribute current density over the area of the electrode.

Abstract: One side of a running web of wrapping material of the tobacco processing industry is provided with adhesive by a nozzle which discharges a stream of minute droplets of liquid adhesive. The droplets are charged by a first electrode immediately after they issue from the orifice of the nozzle and the droplets of the stream are thereupon deflected relative to the running web by a pair of deflecting electrodes whose operation is controlled by an adjustable circuit so as to ensure that the application of adhesive can take place in accordance with variations of one or more parameters including the speed of the running web and/or the permeability of wrappers which are obtained from the adhesive-coated web.

Abstract: A disposable ashtray made of flame-resistant and/or fire-retardant treated paper comprising two substantically identical sheets bonded together along matching outer contours to define an inner space when said sheets are oppositely pulled. The upper section of both sheets are perforated and enclose at least one ply of an interposed smoke absorbing layer. The lower section of least one of the sheets has at least one mouth-like opening having an integral flapped tongue as a holding platform for an in-use cigarette. In addition, a holder stand for keeping the ashtray upright and stable at an expanded position.

Abstract: Novel tobacco compositions which, when subjected to an elevated temperature below the combustion temperature of the tobacco, liberates essentially pure nicotine. The invention also includes a method for liberating nicotine from the compositions and a device for carrying out the method.

Abstract: In one aspect, the invention provides a simple, readily manufacturable, low tar cigarette with individual puff deliveries similar to those obtained from conventional cigarettes which have a higher total smoke delivery such as a full flavor cigarette. The low tar cigarette includes a tobacco rod segment having a length of 53 mm. or less abutting a filter segment having an overall length of at least 31 mm. wherein the filter segment includes a synthetic fiber filter plug and provides a smoke delivery reduction of at least 55% and wherein the cigarette has an average puff count of 6.5 or less. In another aspect, the invention provides nonconventional smoking articles which have an elongated nonsmokable mouthend portion, i.e.

Abstract: Smoking articles, such as cigarettes and little cigars, having self-extinguishing properties when laid on a flat surface yet will not extinguish when held in the hand or placed in an ashtray, are disclosed. The tobacco filler composition of the smoking articles is modified by the addition thereto of a moisture stable alkali metal silicate, the preferred moisture stable alkali metal silicate being borate stabilized sodium silicate.

Abstract: This invention concerns cosmetic applicators for low-viscosity liquid cosmetics. In particular, it relates to an applicator surface consisting of a latex foam having a combined structure including closed cells and open cells. The structure has a porosity for the open cell portion increasing from the area adjacent the closed cells toward the other side of the latex foam applicator. The latex foam can be natural or acrylonitrile-butadiene latex foam.

Abstract: A dental floss applicator is especially designed to cooperate with a floss-loading device. It has a pair of resilient, juxtaposed, divergent prongs attached to a handle. Slots in the ends of the prongs enable the applicator to hold floss of the type having rigid nodules fixed to it at spaced-apart intervals. These intervals are somewhat shorter than the relaxed distance between the prongs, so that the prongs bear outwardly against a pair of nodules. A small outwardly-extending shoulder on the end of each prongs serves the purpose of: (1) Trapping a nodule of the floss, so that a span of the floss is firmly retained thereby; (2) Bearing against convergent surfaces of the loading device, by means of which the prongs are compressed toward each other for loading floss thereon; and (3) It is a device whereby the prongs are retained between the convergent surfaces of the loading device (these convergent surfaces have longitudinal, inwardly-extending lips or flanges under which the shoulders of the prongs slide).

Abstract: An improved dental flossing material and method of making the same is disclosed. The flossing material in the form of a tape is formed of expanded polytetrafluoroethylene (PTFE) folded longitudinally to form a pair of laminae defining a recess therebetween in which an abrasive or non-abrasive cleaning material is disposed. During the cleaning procedure, material flows from the free edges of the tape to become deposited upon the surfaces of the teeth and adjacent gingiva. Due to changes in light transmitting quality of the tape, a visual and reversible indication of prior use becomes apparent. In the manufacture of the tape, the PTFE, which is microporous, is coated on one surface thereof with a moist dentifrice which may be suitably thinned using a volatile vehicle.

Abstract: A dish or glass washer having a sump for retention of rinse water for use in the subsequent wash cycle is formed as two modular units having a low profile wash and rinse chamber to fit under a counter on a sink drainboard and a connected power and control unit with a sump depending into a sink to dump water into the sink.

Abstract: An automatic contact lens cleaner, generally shaped in an inverted U, comprises a battery holder, an electric motor, a speed reduction gear, an intermittent reversing gear using levers which engage a boss on the drive gear, and a pair of contact lens holders suspended from the reversing gear into a dish containing cleaning fluid. The bottom of the dish (one end of the U) is level with the bottom of the motor/battery-holder housing (the other end of the U), allowing the cleaner to rest upon any convenient supporting surface.

Abstract: This stick is designed to be a walking stick, a rescue tool, and a conversation piece. Primarily, it consists of a main body with a handle at one end and a hook is provided at the other end for engaging with a ground surface and hooking onto an article. The design further includes a cup portion for preventing the hook from sinking into soft ground, and a rope is wound on the main body and is releasable at one end when needed for rescue work, etc.

Abstract: A pressure relief valve having an external valve body substantially cylindrical, with a bore therethrough positioned atop the exterior of the pipe, an internal stem portion movable within the bore within the valve body, including a tip for extruding in through a bore in the wall of the pipe, a piston member housed within the internal movable valve body movable from a first position locking fluid flow up through the internal body and a second position allowing fluid to enter the internal body and enter a drain port, a spring member intermediate the upper portion of the valve head and the internal body for biasing the piston member in a normally closed fluid bloding position, means on the valve body for imparting force on the upper portion of the internal member for driving the lower tip portion through the wall of a particular type of fluid flow pipe, and insulation means for housing the external valve and for insulating the valve from direct contact with the fluid flow line.

Abstract: The invention relates to a hydrant comprising a trunk body in which novel valve means for opening the water main is positioned completely within the trunk body and wherein a novel assembly cap is required to activate the valve means.

Abstract: The tubular rotary body of a ball slide consists of components which transverse to its longitudinal axis bear on one another and are detachably connected with one another. The rotary body is preferably split in two in its axis of rotation plane. Reinforcement ribs screwed together in the joining plane and pivot pin flanges connected positively and nonpositively with the rotary body components ensure the coordination of said components. Splitting the rotary body circumvents hauling difficulties, without weakening the load capacity of the rotary slide.

Abstract: A non-turbulent fluid shut-off valve with a shrouded movable valve member outside the flow stream when in its open position.

Abstract: The disclosed gaseous fuel torch apparatus is adapted for use in cutting, welding, heating or other such operations involving the heating, cutting, or fusing of either metallic or non-metallic materials. The apparatus includes a fueling module for supplying gaseous fuel to a torch at an elevated pressure from a relatively low pressure gaseous fuel source, such as a natural gas supply system for example. The fueling module also preferably includes a selectively-operable alternate system for supplying such compressed gaseous fuel for other applications, including the recharging of one or more storage vessels for example. The fuelilng module includes features by which its gaseous fuel discharge pressure can be infinitely varied and preselectively adjusted within the capabilities of the fueling modules's compressor device.

Abstract: Aseptic constant flow valves to be used, for example, in the dairy industry should be readily washable and allow sterilization by means of conventional washing and sterilizing agents. A valve which fulfils these requirements comprises an operating chamber with inlet and outlet which is connected to the valve housing and therefore can be circulation-washed and sterilized together with the latter.

Abstract: A fluid pressure regulator, for controlling the pressure of fluid in accordance with the pressure of an air signal, is characterized by a housing having a chamber divided into fluid and air chambers by at least two flexible diaphragms. The fluid chamber has a valved inlet for connection with a supply of fluid at an elevated pressure, and an outlet. The air chamber has an inlet for receiving an air signal at a selected pressure. A valve is moved by flexure of the diaphragms to open and close the fluid inlet, so that the pressure of the air signal regulates the pressure of fluid in the fluid chamber and at its outlet. A space is defined between the diaphragms, and vents extend from the space to exterior of the housing. Should the diaphragm on the fluid compartment side rupture, fluid entering the space will flow through the vents and provide a visible indication of diaphragm failure, but the diaphragm on the air chamber side will prevent fluid from entering that chamber.

Abstract: A snap-on valve sleeve for a check valve designed to be rigidly and sealingly secured within the end of an elastomeric tube. The sleeve includes a plurality of inwardly disposed barb segments positioned in mating alignment with an annular protrusion positioned about the outer surface of the valve body. The annular protrusion comprises an upward rearwardly sloped surface and a flat step surface perpendicular to the outer surface of the valve body. The check valve is inserted into the end of the tube. The outer edge of the end of the tube slides over the step surface positioning the tube along a partial length of the valve body. The sleeve is positioned over the forward end of the valve body and forced along the length of the valve body until the barb segments ride up the upward rearwardly sloped surface and then snap over the sloped surface to compress and seal the tube between the valve body and sleeve.

Abstract: An apparatus for securing a generally flexible cable to one end of a generally flexible tubular pipe liner which has been impregnated with a thermosetting resin comprises a reinforcing member for reinforcing the liner end to distribute any tension exerted by the liner on the cable. A portion of the liner proximate the one end of the liner is flattened, with the interior liner surfaces interengaging to close the one end and to establish two generally flat liner end portion sides, the flattened liner end portion including a plurality of openings extending therethrough from side to side, the reinforcing member being secured to both sides of the flattened liner end portion. The reinforcing member includes a plurality of openings extending therethrough, the reinforcing member openings being in registry with the liner end portion openings. Fasteners extend through the registered openings in the liner end portion and in the reinforcing members for securing the reinforcing member to the liner end portion.

Abstract: In a circular loom having a machine frame, a lower and an upper running race arranged in said machine frame for guiding the shuttle, the running rollers of the shuttle are fitted between guiding surfaces of the upper and lower running race. To avoid contacting between the running rollers of the shuttle and the warp threads, the running races have thread guiding grooves crossing the guiding surfaces. The thread guiding grooves, in the running direction of the shuttle, are arranged to be inclined by an acute angle relative to the radial direction laid at the middle axis of the machine.

Abstract: A drive connection for reciprocating a connecting rod from an intermittently rotating drive shaft through an eccentric member to manipulate a harness frame of a textile loom from one shedding position to another, includes a drive ring fixed to the drive shaft and a pawl pivotably mounted on the eccentric member for movement into and out of engagement in opposed recesses in the drive ring during dwells in the intermittent shaft rotation to connect or disconnect the eccentric member and the drive ring. The pawl is biased toward engagement in the recesses with opposed shifting levers being provided for actuating selective disengagement of the pawl from the recesses. A pivotable blocking device enables alternate engagement of the switching levers into pawl disengaging position.

Abstract: A fabric for the sheet forming section of a papermaking machine comprising two layers of transverse threads and longitudinal threads interwoven with both layers of transverse threads. Both the paper side and the running side have a transverse structure, and the number of transverse threads in the upper layer is twice as high as that in the lower layer. The longitudinal threads interweave twice in each repeat with the upper layer and with the lower layer. Interweaving with the upper layer is effected one time with a transverse thread laying directly above a transverse wire of the lower layer and the other time with a transverse thread disposed between and above two transverse threads of the lower layer.

Abstract: In the present application there is disclosed an adapter for attachment to a hand-held power tool of the type having cutting means driven by the power tool. The adapter includes a baseplate having an opening through which the cutter may extend. Means for fixing the baseplate to the power tool a guide hingedly fixed to the baseplate and clamping means for holding the guide a predetermined distance from the cutter. The guide is sized to fit within a groove cut by the cutter and is provided with a straight edge adapted to ride in such a groove while a second groove is being cut so that box or finger joints may be made with the tool and adapter.

Abstract: A wood cutting knife is provided for producing wood chips or flakes. The knife includes a central cutting member, and two wing members positioned on opposite sides of the central cutting member. The height of the wing members determines the depth of cut of the cutting knife, including the central cutting member. Also provided is a wood processing machine for supporting such cutting knives which includes a plurality of anvil members configured to interact intimately with the cutting knives. Also provided is a breakaway feature between the cutting members and a supporting surface defined by the wood processing machine. The supporting surface is relatively smooth, and the cutting knives are mounted to the surface by weldments. If a cutting knife encounters unprocessable foreign material such as metal or rock, the knife breaks away from the supporting surface at the weldment connection, and severe damage to the supporting surface or machine is avoided.

Abstract: A method of slicing wood by moving a wooden workpiece on a linear path, and forcing one end against a blade directed longitudinally along the grain, applying pressure on both sides of the workpiece, on opposite sides of the blade by means of pressure pads, and, allowing the pressure pads to move relative to the blade, while maintaining equal spacing between themselves, so as to equalize the compressive force on both sides of the workpiece in the region of the blade, and an apparatus for carrying out the method.Also disclosed is a wood slicing blade with angled cutting edges, which is short and stiff, and a blade holder assembly arranged to tension the blade laterally.