Abstract: A handle assembly has a first handle with first and second end regions connected to and fixed relative to first and second mounts on a wall, respectively. A second handle extends longitudinally between third and fourth end regions, with the third end region connected to the first end region of the first handle. The first and second handles each have surfaces for grasping by a user. A position of the second grab bar is adjustable relative to the first grab bar by at least one of one of pivoting the second grab bar about the longitudinal axis of the first grab bar, pivoting the second grab bar about a horizontal axis adjacent to the first end region of the first grab bar, and sliding the second grab bar along the first grab bar. A method of installing the handle assembly is also provided.

Abstract: A needle screw fitted to a compressed fluid supply part that is provided on a nozzle main body of a dust removing device adjusts the jet flow rate of a first compressed fluid from a jet nozzle by adjusting the flow path area of a first fluid supply path. Meanwhile, the suction flow rate of a second compressed fluid to be discharged into a discharge flow path is adjusted by adjusting the flow path area of a second fluid supply path by turning a nozzle main body-side adjustment screw that is provided on the nozzle main body and a suction nozzle-side adjustment screw that is provided on a suction nozzle.

Abstract: The present invention provides for an ergonomic dust extraction extender tool to assist in ergonomically operating hand-held power tools while acting on an object or surface and furthermore allows for the collection of harmful dust being generated while a hand-held power tool is in use. Exemplary embodiments include a tool mounting assembly at the distal end of the tool, a handle at the proximate end of the tool, and an intermediate extent connected between the mounting assembly and the handle. Other aspects include the use of mounting assemblies for securing power tools to the extender tool, the handle at the proximate end of the tool being angularly offset from the connection portion, the incorporation of a dust collection mechanism at or about the mounting assembly, and a dust monitoring sensor for monitoring dust content and limits of certain dust content.

Abstract: An autonomous cleaning robot includes a controller configured to execute instructions to perform one or more operations. The one or more operations includes operating a drive system to move the cleaning robot in a forward drive direction along a first obstacle surface with a side surface of the cleaning robot facing the first obstacle surface, then operating the drive system to turn the cleaning robot such that the side surface of the cleaning robot faces a second obstacle surface, then operating the drive system to move the cleaning robot in a rearward drive direction along the second obstacle surface, and then operating the drive system to move the cleaning robot in the forward drive direction along the second obstacle surface.

Abstract: A vacuum cleaner including a suction inlet that provides entrance of a suction airflow, a suction source, a diffuser, a blower port, a duct, and a removable cap. The diffuser is in fluid communication with the suction source for diffusing the suction airflow and the diffuser includes a circumferential opening that surrounds the suction source such that the suction airflow travels through the opening into the diffuser. The duct is located downstream of the blower port with respect to the direction of the suction airflow and the duct includes an outlet. The cap is removably coupled to the blower port such that at least a portion of the suction airflow exhausts through the blower port when the cap is removed, and when the cap is coupled to the blower port the suction airflow is travels through the duct and exhausts through the outlet.

Abstract: A broom assembly including a hollow handle extending from a broom head to a vacuum assembly and defining a vacuum flow path. The broom head has a base bottom and groups of bristles and a flexible intake section are mounted within the base bottom. A vacuum assembly is secured to the hollow handle at the end opposite the broom head and the vacuum assembly includes a suction motor and a removable container. A vacuum flow path from the intake section through the hollow handle is subject to suction forces by the suction motor and particulates swept together by the bristles travel through the vacuum flow path and collect in the container.

Abstract: A dust collecting apparatus is provided. The dust collecting apparatus according to an embodiment includes a dust collecting case including a dust outlet to discharge collected dust, a cyclone member configured to rotate and move linearly in the dust collecting case to be detachable from and attachable to the dust collecting case, a discharge cover configured to rotate and move linearly together with the cyclone member, and detachable from and attachable to an upper part of the dust collecting case to open and close the dust outlet, and a sealing member having elasticity disposed between the dust collecting case and the discharge cover. The discharge cover rotates along a horizontal direction of the dust collecting case to detach from the upper part of the dust collecting case and form a space between the sealing member and the dust collecting case.

Abstract: A vacuum cleaner comprises a nozzle (N) for cleaning a surface, a suction tube (T) for receiving input air from the nozzle (N), a cyclone device having a cyclone (C) and a dirt container (DC) both oriented substantially perpendicular to the suction tube (T), a cyclone device input coupled to the suction tube (T) from which the input air is transported, following a spiral around a center, in a first direction substantially perpendicular to the suction tube (T) to reach a stage (V) at which dirt is separated from the input air to obtain cyclone output air, from which stage the cyclone output air is conveyed through a conduit in a second direction substantially perpendicular to the suction tube (T) and opposite to the first direction to arrive at a cyclone device output, a filter (F) for filtering the cyclone output air, and an airflow generator (A) for generating an airflow through the suction tube (T), the cyclone (C) and the filter (F), wherein when the nozzle (N) is touching the surface, the suction tube (T)

Abstract: A vacuum cleaner including a housing, a suction inlet, a suction source, a collector and a filtering unit. The housing includes a suction airflow through the housing. The suction source draws the suction airflow through the suction inlet. The collector receives debris separated from the suction airflow and is disposed between the suction inlet and the suction source. The filtering unit includes a filter, a retractable member, and a biasing member, where the retractable member is operable in directions towards and away from the filter for supplying momentary impact to the filter for providing agitations to rid the filter from debris. The biasing member urges the retractable member towards the filter.

Abstract: A vacuum cleaner comprises a cleaner main body configured to generate suction power; a suction unit configured to suck up dust and foreign substances by the suction power; a connection pipe configured to transfer the sucked dust and foreign substances; a connection unit comprising a connection pipe accommodator configured to accommodate an end portion of the connection pipe, a separation controller configured to separate the accommodated end portion of the connection pipe from the connection pipe accommodator, and a space configured to place the separation controller therein; and a power cable configured to supply electric power from the cleaner main body to the suction unit, and disposed to pass through the space in which the separation controller of the connection unit is provided.

Abstract: The present invention relates to a vacuum cleaner device (1) for operation on a floor area (F), comprising: a suction duct (7) and an actuator (9) arranged and configured to generate an underpressure in the suction duct (7) so that air is sucked into the suction duct (7), a temperature sensor (10) configured to sample an air temperature in the vicinity of the device (1), wherein said temperature sensor (10) is arranged in the suction duct (7) or adjacent an opening (6d) of the suction duct (7), and an analyzing unit (3) configured to detect a wet spot (W) on said floor area (F) using said sampled air temperature.

Abstract: The invention relates to a floor cleaning appliance which comprises at least one cleaning assembly for cleaning a floor surface and an optical detection device with which a floor type is determinable. In order to provide a floor cleaning appliance with which a reliable determination of the floor type is possible, it is proposed in accordance with the invention that the detection device is configured as or comprises a spectroscopic device with which the floor type is determinable on the basis of a spectrum of the floor surface recorded by reflection measurement. The invention also relates to a method for floor cleaning.

Abstract: A robotic surface cleaning device is provided, including a casing, a chassis, a set of wheels coupled to the chassis to drive the robotic surface cleaning device, a control system to instruct movement of the set of wheels, a battery to provide power to the robotic surface cleaning device, one or more sensors, a processor, rotating assembly, including a plate supported by a base of the casing, rotating mechanism to rotate the plate; and one or more cleaning apparatuses mounted to a first side of the plate.

Abstract: An orbital single-brush machine comprising a frame which rests on the floor and is provided with at least one movement handle; the frame being connected to a motor which is adapted to actuate with combined rotary and orbital motion a work tool that acts on the floor; the frame comprising a first substantially plate-shaped footing which is spaced apart from the floor, and a second substantially plate-shaped footing which supports the motor and is arranged below the first footing and is supported so that it can rotate freely by the first footing about an oscillation axis that is substantially parallel to the floor and substantially perpendicular to the advancement direction of the machine.

Abstract: To provide an electric cleaning apparatus including a vacuum cleaner that loads an appropriate amount of electrolyzed water and does not reduce convenience in terms of power consumption and lightness. An electric cleaning apparatus includes a vacuum cleaner and a station. The vacuum cleaner comprises: a first reservoir configured to store electrolyzed water; and a first cleaner configured to clean a surface to be cleaned by using the electrolyzed water supplied from the first reservoir. The station comprises: a second reservoir configured to store water; an electrolyzed-water generator that generates the electrolyzed water by electrolyzing the water; and a supply system configured to supply the first reservoir with the electrolyzed water generated with the electrolyzed-water generator when the vacuum cleaner is connected to the station.

Abstract: A surface cleaning apparatus is provided with a housing including a suction source and a plurality of base assemblies that can be operably coupled to the housing. The multiple base assemblies can include different base assemblies for cleaning multiple surface types. A fluid distributor, including a base distributor, can supply cleaning fluid for a surface to be cleaned from at least one of the plurality of base assemblies.

Abstract: A method of operating an autonomous cleaning robot is described. The method includes initiating a training run of the autonomous cleaning robot and receiving, at a mobile device, location data from the autonomous cleaning robot as the autonomous cleaning robot navigates an area. The method also includes presenting, on a display of the mobile device, a training map depicting portions of the area traversed by the autonomous cleaning robot during the training run and presenting, on the display of the mobile device, an interface configured to allow the training map to be stored or deleted. The method also includes initiating additional training runs to produce additional training maps and presenting a master map generated based on a plurality of stored training maps.

Abstract: A method of operating an autonomous cleaning robot is provided. The method includes receiving, at a handheld computing device, data representing a status of a debris collection bin of the autonomous cleaning robot, the status of the bin including a bin fullness reading. The method also includes receiving, at the handheld computing device, data representing a status of a filter bag of an evacuation station, the status of the filter bag including a bag fullness reading. The method also includes presenting, on a display of the handheld computing device, a first status indicator representing the bin fullness reading, and presenting, on the display of the handheld computing device, a second status indicator representing the bag fullness reading.

Abstract: In one embodiment, a user indicates one or more virtual zones on an area map on a user device for a particular robot. The zones are then transferred to the robot. The robot determines an optimum order for multiple zones and a path for navigating to the different zones.

Abstract: An evacuation station for collecting debris from a cleaning robot includes a controller configured to execute instructions to perform one or more operations. The one or more operations includes initiating an evacuation operation such that an air mover draws air containing debris from the cleaning robot, through an intake of the evacuation station, and through a canister of the evacuation station and such that a receptacle received by the evacuation station receives at least a portion of the debris drawn from the cleaning robot. The one or more operations includes ceasing the evacuation operation in response to a pressure value being within a range. The pressure value is determined based at least in part on data indicative of an air pressure, and the range is set based at least in part on a number of evacuation operations initiated before the evacuation operation.

Abstract: A rotary dewatering mop device comprises an outer casing, a barrel, a cleaning assembly and a holding assembly. The cleaning assembly is pulled upward through the holding assembly to be placed in the barrel and is moved upward and downward reciprocatically through a handheld rod to drive the barrel and the cleaning assembly to generate a centrifugal force of rotation, thereby achieving rapid dewatering.

Abstract: A cleaning device for removing marks from a surface includes a body of melamine foam sponge having a front side and a rear side opposed to the front side, and a holding layer secured to the rear side of the body of melamine foam sponge to prevent relative movement therebetween. The holding layer is preferably a cloth and more preferably natural or synthetic chamois which can be used to wipe and/or buff the surface after rubbing the body of melamine foam sponge on the surface to remove at least one surface mark. The body of melamine foam sponge can be pre-moistened with a liquid such as a disinfecting solution.

Abstract: The invention relates to a wetting device (1) for flat mops, wherein a mechanical elevator (5) contains a contact structure (6) and brackets (7a, 7b), wherein the brackets (7a, 7b) lift the transfer plate (4) away from the lower end (35), if the contact structure (6) is pressed towards the lower end (35). The invention also relates to a cleaning trolley (40) with said wetting device (1).

Abstract: A method for monitoring usage of a consumable in an appliance includes optically scanning a consumable container with a reader of a mobile computing device, establishing a volume of consumable within the consumable container based upon the optical scan of the consumable container by the reader, determining a volume of consumable dispensed in an appliance, and activating a low consumable alert in response to a difference between the established volume of consumable and the determined volume of dispensed consumable being less than a threshold volume.

Abstract: A system for dosing substances such as cleaning and/or care agents is disclosed. The system includes a dosing device, at least one energy source, a control unit, a sensor unit, and at least two cartridges for respectively accommodating at least one of the cleaning and/or care agents. The at least two cartridges are capable of being coupled to the dosing device.

Abstract: A dishwasher appliance includes a tub that defines a wash chamber. A door is mounted to the tub for selectively accessing the wash chamber of the tub. A vortex air dryer has four vents and a fan. The four vents are positioned and oriented for forming a vortex air flow in the wash chamber during operation of the fan.

Abstract: Disclosed are a rack for a dishwasher, a dishwasher having the same and a manufacturing method thereof. The rack for dishwasher includes a rack body that accommodates therein objects to be cleaned and is disposed within a washing space of the dishwasher, and a fluorine-combined layer formed by molecular binding of fluoride onto a surface of parts formed of a plastic member, enabling the wetting property on the surface of plastic member to be increased to enhance the wetting performance, and friction on the motion parts to be reduced.

Abstract: An endoscope includes an insertion portion having a light source portion configured to emit illuminating light therefrom when inserted into a body cavity. An imaging portion is configured to capture an image in the body cavity. A transmission portion configured to transmit the image captured by the imaging portion. A battery is configured to supply electric power needed for endoscopic observation. A power control portion is configured to selectively control a supply of electric power to all of the light source portion, the imaging portion, and the transmission portion in a standby mode in which power consumption is reduced compared with a normal operation mode in which a supply of electric power is performed from the battery to all of the light source portion, the imaging portion, and the transmission portion.

Abstract: The disclosed technology is directed to an endoscope having respective first and second operations, a movable member, respective support and friction members, a cam member and a click mechanism all of which are engaged with one another to operate the endoscope during an operation. First and second operation members are disposed in the endoscope and are rotationally operated around a predetermined axis to carry out operation of the endoscope. A movable member is disposed inside the first operation member and is movable between a first position and a second position. A cam member having a cam surface that is made with an inclination with respect to the predetermined axis and abuts against part of the movable member. A click mechanism holds the cam member at the first position or the second position.

Abstract: An image pickup apparatus includes: an optical unit including an incident surface and an emission surface, in which a plurality of optical members are arranged around an optical axis; a polygonal prism image pickup unit including a light receiving surface, a rear surface and a plurality of side faces, in which a plurality of elements including an image pickup device configured to photoelectrically convert light made incident from the optical unit and output an image pickup signal are laminated; and at least one guide, a front portion of which is fixed to the emission surface of the optical unit and a rear portion of which is provided with a plurality of contact surfaces that are respectively in contact with and fixed to the plurality of side faces of the image pickup unit.

Abstract: The disclosed technology is directed to an endoscope comprises an endoscope body defined by an insertion portion and an operating portion both of which are a hermetically sealed structure with a predetermined gas pressure maintained in the endoscope body. The operation portion includes a ventilation inlet attached thereto to deliver a gas into the endoscope body and to hold the gas at the predetermined gas pressure in the endoscope body. A measuring unit is configured to be mounted on a board disposed in the operating portion for measuring a gas pressure in the endoscope body. A controller is configured to acquire a value measured by the measuring unit and to determine whether or not there is a gas leakage from the endoscope body based on the acquired measured value.

Abstract: An endoscope includes an insertion portion, a raising base, an operation portion, a long member configured to cause the raising base to operate, a moving mechanism configured to allow the long member to be inserted through an inside, and move in an axial direction along the long member, a fixing tool that is attachable and detachable to and from the moving mechanism, and is configured to fix the moving mechanism and the long member by being attached to the moving mechanism, and an urging member that is disposed to contact the moving mechanism and the fixing tool, is set in a direction to separate the moving mechanism and the fixing tool from each other, is configured to push the moving mechanism by bringing the fixing tool close to the moving mechanism, and has an urging force with a strength that moves the moving mechanism to a predetermined position.

Abstract: The disclosed technology is directed to a puncture needle access system for introducing guide wire into an interior of a tubular organ. The puncture needle access system includes an endoscope having an insertion portion. An endoscopic puncture needle is configured to be engaged with the insertion portion and includes an elongated tubular sheath having a lumen that extends in a longitudinal direction through the elongated tubular sheath. A tubular needle tube is inserted movably in the longitudinal direction into the lumen of the elongated tubular sheath. The tubular needle tube includes an inclined cutting-edge face formed at a distal end. The elongated tubular sheath includes an inclined surface oriented toward a distal end of the sheath so that the inclined surface comes closer to the elongated tubular sheath. The distal end of the sheath is located on a proximal end side of the sheath relative to a distal end of the inclined surface.

Abstract: An imaging connector includes a proximal side and a distal side. The proximal side includes a light input opening and an image output opening. The distal side includes a light output opening and an image input opening. The imaging connector is operable to (i) transmit light from the light input opening to the light output opening, and (ii) transmit an image from the image input opening to the image output opening.

Abstract: The present invention relates to a coupling device for a medical instrument, such as an endoscope, comprising a base part and two cooperating engaging elements connected to the base part, wherein the cooperating engaging elements being movable between a clamping position and a receiving position, wherein each of the cooperating engaging elements being linearly translationally movable between the clamping position and the receiving position, and wherein the translations of the cooperating engaging elements are located on a coinciding line. The present invention further relates to a method for coupling the device according to the present invention with a medical instrument and use of the device according to the present invention, as well as to a kit-of-parts and an insert for use in the device according to the present invention.

Abstract: A hood for endoscope is attached to an endoscope that includes an insertion portion, a distal end portion, and a conduit, the hood for endoscope including a frame mounted to an outer circumference of a distal end portion, a discharge opening that communicatively connects an inner circumferential surface and an outer circumferential surface of the frame and is provided to be slanted to be oriented in a longitudinal axis direction, and a straightening plate with which a gas ejected from the discharge opening towards a front side in the longitudinal axis direction collides and which guides the gas from a flowing orientation of the gas in the longitudinal axis direction to the flowing orientation of the gas in a radial direction in such a manner that the gas is caused to pass through the discharge opening from an inside of the frame and flow towards an outside of the frame.

Abstract: Provided are a miniature endoscopic probe and a multi-photon endoscopy including the same.

Abstract: An optical system for rigid endoscope includes an objective optical system, an eyepiece optical system, and a relay optical system which is disposed between the objective optical system and the eyepiece optical system. The objective optical system includes in order from an object side, a first lens having a negative refractive power, a second lens having a positive refractive power, a third lens having a positive refractive power, and a fourth lens having a negative refractive power. The following conditional expressions (1) and (2) are satisfied: ?3<(RL1i+RL1o)/(RL1i?RL1o)<?1.3 ??(1) 30<vdL1 ??(2) where, RL1o denotes a radius of curvature of an object-side surface of the first lens, RL1i denotes a radius of curvature of an image-side surface of the first lens, and vdL1 denotes Abbe number for the first lens.

Abstract: There are provided a medical image processing device, an endoscope system, a diagnosis support device, and a medical service support device that can allow the observation of a medical image performed by a user not to be obstructed, allow a user not to miss a region of interest, and allow attention required during observation to be continued. An image acquisition unit acquires a medical image including a subject. A medical image is displayed in a first display region (A1) of a monitor. A bounding box, which is notification information, is superimposed and displayed on the medical image in the first display region (A1). In a case where the area of a region of interest is increased, or the like, the notification information is not displayed in the first display region (A1) and an icon, which is separate notification information, is displayed in a second display region (A2) of the monitor.

Abstract: The present invention may be embodied as a retrievable device capable of sensing one or more properties of an individual (e.g., chemical or physical parameters). In use, the retrievable device can continuously determine the chemical concentrations within the vaginal tract. An embodiment of the retrievable device comprises a first housing having a light source and an image capture device, a second housing removably connected to the first housing and having a sensor, and a fitting for retrieving the device. The sensor may be an analyte sensor configured to obtain at least one measurement of a concentration of an analyte in a fluid. The analyte sensor comprises a sensor substance in a sol-gel material so the sensor substance reversibly interacts with an analyte of interest. In addition, the retrievable device can be configured to determine different physical parameters and re-implanted.

Abstract: There is provided herein, an endoscope comprising an elongated shaft terminating with a tip section wherein said tip section comprises a permanent section connected to the elongated shaft and a removable section securely connectable to the permanent section, wherein the removable section comprises at least one capture device and at least one light source.

Abstract: An endoscope system includes a plurality of light sources which emits light having different wavelengths, a photodetector which is provided in each of the plurality of light sources, and which receives a part of the light of the plurality of light sources and obtains information on a light emitting quantity of the plurality of light sources, an image acquisition unit that acquires an image to be observed for each illumination light using at least first illumination light and second illumination light, composed of the light emitted from at least one of the plurality of light sources, and a control unit that makes a mutual image signal ratio constant in the plurality of images acquired by the image acquisition unit.

Abstract: It is enabled to more appropriately prevent thermal damage to an area irradiated with illumination light. An image acquisition system is provided including: a first light source unit that emits narrow band light having a peak intensity in a specific band; a second light source unit that emits wide band light having a band wider than the specific band; a generation unit that generates multiplexed light by using the narrow band light and the wide band light; an imaging unit that images an irradiation target of the multiplexed light; a prediction unit that performs prediction of a temperature of an area irradiated with the multiplexed light in the irradiation target; and a control unit that performs control of outputs of the narrow band light and the wide band light on the basis of the prediction.

Abstract: A system comprises a waveguide apparatus comprising a plurality of input waveguides, a multimode waveguide, and a guided-wave transition coupling the plurality of input waveguides to the multimode waveguide. The system further comprises at least one light source configured to excite in turn each of a plurality of the input waveguides, or each of a plurality of combinations of the input waveguides, thereby generating a plurality of different light patterns in turn at an output of the waveguide apparatus. The waveguide apparatus is configured to direct each of the plurality of different light patterns to a target region. The system further comprises at least one detector configured to detect light transmitted, reflected or emitted from the target region in response to each of the different light patterns, and to output signals representing the detected light.

Abstract: A method of inhibiting flow of a purging fluid from a device comprises positioning an imaging hood in proximity to a tissue region to be visualized. The imaging hood includes a distal membrane which defines a main aperture. The imaging hood and the distal membrane define an open area. The method also comprises introducing the purging fluid into a proximal portion of the open area. The proximal portion is bounded by a proximal membrane including a plurality of apertures. The method also comprises pressurizing the proximal membrane with the purging fluid to a partially extended state in which the purging fluid flows through the plurality of apertures and through the main aperture. The method also comprises pressurizing the proximal membrane with the purging fluid to a blocking extended state in which the proximal membrane obstructs the main aperture to block the flow of the purging fluid through the main aperture.

Abstract: An otoscope includes an instrument head, a tip element and an optical system. The instrument head has a distal insertion portion for insertion into an ear of a human or veterinary subject. The distal insertion portion has a distal opening. The tip element is releasably attached to the distal insertion portion. The tip element has a distal opening. The optical system is contained within the instrument head. The optical system includes a plurality of optical components. The optical system further comprises a viewing component for viewing of an image of a target of interest aligned along an optical axis disposed within said distal opening. The optical system is configured to provide a field of having a diameter equaling at least 7 mm at a distance of at least 15 mm from a distal opening of said attached tip element. The optical system is further configured to simultaneously provide a distance range of optimal focus having a range of at least 8 mm.

Abstract: Provided is an image capturing device for capturing an image of a target. The image capturing device includes: a tubular portion including an optical component and configured to receive light from the target; a housing including an electronic component configured to process the light received from the tubular portion; a cap covering at least a part of the tubular portion; and a blower mounted in the housing and configured to supply air to at least one of the cap and the optical component included in the tubular portion. The cap and the part of the tubular portion covered by the cap define an air-feeding path configured to pass the air supplied from the blower.

Abstract: The present disclosure relates to an image capturing device configured to capture an image of a target. The image capturing device includes a probe and a housing. The probe includes an optical component and is configured to receive light from the target. The housing includes electronic components each configured to process the light received from the probe. Moreover, the housing includes an air sending unit, and a controller configured to control driving of the air sending unit. The air sending unit is provided at a position above the electronic components in the housing when a user holds the housing during utilization of the image capturing device, and is configured to supply air to the optical component provided in the probe.

Abstract: An apparatus for a surgery that has a sleeve extending between a first end and a second end and defining a passage there through, a first band extending from the first end of the sleeve and connecting the sleeve to a light source, and at least one fiber optic filament defined at least partially in the first band and being incorporated into the sleeve, the fiber optic filament extending from the light source. The fiber optic filament extends from the light source to the second end of the sleeve to thereby direct light generated by the light source out of the second end.

Abstract: A speculum includes a first blade member and a second blade member. Each of the first and second blade members extend from a proximal end to a distal end. A speculum control includes a control nut threadingly engaged with a threaded shaft. Internal threads of the control nut are oversized relative external threads of the threaded shaft such that the control nut freely spins upon the threaded shaft.