Abstract: A polishing machine includes a body. A driving motor is installed in the body. The driving motor has an eccentric shaft mounted at a bottom of the motor, and a polishing wheel connector mounted under the eccentric shaft. A dust shield is mounted on the body and outside the driving motor. Multiple brake units are mounted at a bottom of the dust shield. A polishing wheel is mounted under the dust shield and fastened on the polishing wheel connector by a threaded pin formed at a center of the polishing wheel. The polishing wheel is in contact with the multiple brake units.

Abstract: An insulation system comprising: a supply of material having discrete elements; an applicator assembly for installation of the material having discrete elements to a surface; and a scrubber for finishing the face of the material, the scrubber including: (a) a vacuum conduit; (b) a blade assembly attached to the vacuum conduit; (c) a drive for the blade assembly; and (d) a vacuum substantially adjacent the face of the material during finishing. In the one embodiment, the system comprises a transporter system downstream of the supply of material having discrete elements for delivery of the material to the applicator assembly. Also, in one embodiment, the blade assembly comprises an axis of rotation perpendicular to the face of the material during finishing.

Abstract: A grinding machine with a dust collector includes a driving portion, a transmitting portion, a dust-collecting tube, a fender, an air intake connector and a grinding wheel. The dust produced by the rotation of the grinding wheel is sucked by the dust-collecting tube having an inner tube. The inner tube is interconnected with an exhaust vent of the driving portion and the dust-discharging opening. An outlet of the inner tube is parallel to an airflow passage of the dust-discharging opening, such that when an exhaust gas is discharged from the inner tube, a siphon effect is produced at the airflow passage of the dust-collecting tube to suck and collect the dusts produced by the grinding wheel.

Abstract: An auxiliary dust collection system can be interposed between a sander or other dust producing tool and a vacuum source, e.g., shop vacuum. This auxiliary system has a cyclonic separator connected by a flexible hose to the tool and by another hose to the vacuum source. The cone of the separator is mounted onto the lid of a drum into which the dust precipitates. For a tool that has its own blower, the vacuum source can be omitted, and the air leaving the outlet duct of the separator can be filtered and returned to the ambient. A drop in silencer formed of a sleeve or tube of acoustic foam can be positioned into the inlet side of a filter cartridge following a cyclonic separator. The silencer absorbs a significant fraction of the process noise.

Abstract: A vacuum-assisted pole sander includes a sanding means attached at the end of the main pole, which in turn is supported in its middle section by a support pole. Both the support pole and the main pole are hollow and adjustable in length. The vacuum is transmitted from the sanding means of the device through the main pole to the vacuum connector in the supporting pole such that a vacuum can be attached on to ensure dust removal during operation. The combination of the support pole and the main pole is designed in such a way that the entire device is supported on the floor of the building under construction while allowing the operator to move it easily back and forth to achieve sanding of the ceiling. The support pole has a non-slip cap on its lower end and an angle connector on the other end.

Abstract: A power tool with a dust collection function has a motor, a dust collection fan, and a cover member. The dust collection fan is driven by the motor for collecting a dust. The cover member covers the dust collection fan. The cover member provides an air passage surrounding the dust collection fan in a circumferential direction of the dust collection fan. The cover member is configured and arranged to provide a lower pressure section and another section in the air passage when the dust collection fan rotates. The lower pressure section provides a lower static pressure than the another section. Accordingly, the power tool ensures highly efficiency for collecting a dust particle.

Abstract: A method for dry finishing of a floor surface consisting of concrete, stone, marble, terrazzo, densite or other hard materials is disclosed. The method comprises finishing of the floor surface using a cutting, grinding and/or polishing tool. In the method, a vapor or aerosol is applied to the floor surface and/or the tool in connection with said dry finishing. An apparatus and a set of parts for carrying out the method are also disclosed.

Abstract: A radial arm saw is adapted with a safety top configured with cutting box enclosure that contains and collects substantially all of the sawdust generated during use. A dust collection system is in fluid communication with the cutting box for removing the sawdust contained therein. Spring biased push blocks function to hold the work piece in place during the sawing process while maintaining the user's hands safely away from the saw blade. A laser alignment device projects a beam within the cutting box along the cutting plane. A control panel is provided to allow use by authorized users upon entry of an authorization code.

Abstract: A pavement cutting and vacuum system is provided that includes a transport vehicle having a holding tank carried thereby; a pavement surface cutting machine having a blade for cutting a pavement surface during a cutting operation; and a vacuum system including a vacuum head connected to the cutting machine and a vacuum hose connecting the vacuum head to the holding tank, such that cuttings created during the cutting operation are transported from the vacuum head to the holding tank by the vacuum system.

Abstract: In a cutting apparatus having a circular blade with a dust discharging unit for, during cutting, discharging chips (dust) within a dust cover covering the circular blade, a pulley is fixed to an output shaft of a power source, and a flat belt for transmitting power to the dust discharging unit is engaged with the pulley. The pulley and the flat belt are covered with an inner cover within the dust cover. The inner cover has a through hole for allowing the output shaft to protrude the inner cover therethrough with a seal made of felt to prevent dust from entering the inside of the inner cover. A surface touching member is provided around an opening edge of the dust cover movable along an axial direction of the output shaft by spring-loading, which automatically reduces the gap between the dust cover and the object to prevent dust from being scattered.

Abstract: A cover device for partially covering a disc-shaped working tool includes a bearing member (22) forming a receiving space (54) for receiving the shielding member (10) of the working tool and having an inner surface (24) against which an outer surface of the shielding member (10) lies when received in the receiving space (54), and a pivot member (48) supported on the bearing member (22) for a pivotal movement about a pivot axis (S1) between a locking position in which the receiving space (54) is limited at both ends in tangential and axial directions and is at least partially limited outwardly in a radial direction, and an open position in-which the receiving space (54) is open in at least one of the axial direction and the tangential direction.

Abstract: A table saw having a horizontal worktable, an open bottom base below the worktable enclosing a rotating blade that cuts wood objects on the worktable surface, and a stand for supporting the base from the floor. The table saw further including a sawdust collector for removable attachment to the base. The sawdust collector including a flexible catch bag with an opening at its top to receive the sawdust, a connection at the bottom for attachment to a vacuum device, and a zipper at the bottom for batch-wise collection and continuous discharge of sawdust. The outer peripheral edge of the top opening has a fastening structure, such as VELCRO, that permits the sawdust collector to be removably attached to a corresponding fastening structure of the table saw.

Abstract: Embodiments of a conditioning head for in-situ conditioning and/or cleaning a processing pad of a CMP, ECMP, or other processing system are provided. In one embodiment, the conditioning head includes a brush disposed in a central cavity. A cleaning fluid is provided through the central cavity of the conditioning head to a processing pad. The brush spins and moves laterally across the surface of the processing pad. The cleaning solution dispensed through the conditioning head dissolves by-products of the processing operation while the brush gently wipes the processing pad. A lip of the conditioning head retains the cleaning fluid and cleaning waste, thereby minimizing contamination of the area outside of the conditioning head. The cleaning waste is removed from the processing pad via passages formed near the outer periphery of the conditioning head.

Abstract: A cutting machine includes a bottom collecting tray, a cutting blade overhanging on a cutting table and having a cutting area defined at an outer circumferential portion thereof when the cutting blade cuts the work piece, and an environment control arrangement. The environment control arrangement includes an end collecting tray, which is upwardly extended from the bottom collecting tray, having a collecting chamber for collecting residual particles of the work piece while the cutting blade cuts the work piece, wherein the end collecting tray must be upwardly extended to a position above the cutting area of the cutting blade, and a suction source having a sucking inlet provided at a lower portion of the end collecting tray for collecting the residual particles within the collecting chamber by means of sucking effect.

Abstract: The present invention describes a plate comprising a mono-block body through which a plurality of holes pass, and a deflector that covers at least the external part of the upper surface of said mono-block body. The mono-block body is made up of a rigid support sunk into a flexible body and provided with a holed peripheral part. Said deflector partially or completely covers said peripheral part of the rigid support and presents in the second case a plurality of slits for the passage of the dust sucked through said holes.

Abstract: A grinding machine includes an abrasive element rotatably mounted on a support frame and coupled to a drive, a blower casing including a surrounding wall which confines a blower chamber and which extends beyond and which is spaced apart radially from a rim of the abrasive element to define a surrounding intake passage therebetween, a dust discharge port disposed downstream of the intake passage, communicated with the blower chamber and, and offset from an axis of the abrasive element, and an impeller disposed in the blower chamber and coaxial with the abrasive element such that dust generated as a result of a grinding operation of the abrasive element is entrained in an air stream drawn into the blower chamber through the surrounding intake passage and subsequently out of the discharge port by virtue of rotation of the impeller.

Abstract: A dual position sharpening device can be set up so that the abrasive wheel is either vertical or horizontal. A guard retains cooling water in either position.

Abstract: A pneumatic buffing machine including a housing having an internal chamber in which a pneumatically driven motor set is mounted. The motor set includes an eccentric block for driving a grinding disc. A skirt shade is screwed under a bottom of the housing by means of outer thread and inner thread. The skirt shade has a large diameter section and a small diameter section. The skirt shade is formed with a central through hole. The eccentric block of the motor set is passed through the through hole and accommodated in the large diameter section. A shoulder section is formed between the large diameter section and the small diameter section and adjacent to the outer thread of the small diameter section. A top end of the small diameter section serves as a stopper section.

Abstract: The present invention refers to a motorized tool with suction and dust collection capacity. The tool comprises: means for extracting dust suitable for producing a flow of air; means for collecting dust having a first duct for the entrance of the air, that can be connected separately to said tool, and at least one second duct for the air, connected to the outside environment; said means for collecting dust include a filtering element positioned between said first duct and said second duct. Said filtering element defines an internal space and an external space surrounding said internal space, one of which is in communication with said first duct and the other is in communication with said second duct.

Abstract: A floor sanding vacuum is designed to be used in conjunction with floor sanding machines to provide a near dust free process for sanding floors. A displacement blower is driven by a gasoline or electric motor which creates a high vacuum that draws air through the sanding machine via a flexible hose connected to a cyclone separator where the sanding debris drops into an integral hopper. After the cyclone, the air is drawn through an air filter to the blower where the cleaned air is discharged through either an optional integral silencer built into the base of the vacuum or a commercially available silencer for noise reduction.

Abstract: A joint compound sanding device (10) comprises a hand held housing (12) and a bottom plate (66) coupled to the hand held housing (12). The bottom plate (66) includes a plurality of dust collection apertures (74) extending through the bottom plate (66) between a vacuum manifold (64) and a bottom surface (76). A plurality of dust collection channels (78) are formed in the bottom surface (76) defining mesas (80) there between. The mesas support a porous joint compound sanding screen (54). A motor is coupled to hand held housing (12) and includes a rotating shaft coupled and rotating to a dust collection fan (30) such that air is drawn through a porous joint compound sanding screen (54), through the channels (78), through the dust collection apertures (74) into the vacuum manifold (64) and through the fan inlet (32) and expelling the air into an exhaust manifold (34).

Abstract: Abrasive discs for use with orbital sanders having dust extractor systems are provided in which the discs have an annular perforated zone intermediate between the center and the circumference of the disc in a location corresponding to the location of dust extractor ports in the cooperating backup pad.

Abstract: Drywall sanding apparatus employing a spring tensioned frame surround about its sanding component to capture substantially all generated dust within a collecting bag secured with said frame, to be thereafter emptied.

Abstract: A grinding disc structure including an integrally formed main disc adapted to a dust-sucking cover body of a grinder. The main disc has multiple through holes nearly in parallel to an axis of the main disc. The main disc is further formed with multiple internal passages which are horizontally formed in the main disc corresponding to the through holes and nearly perpendicular to the axis of the main disc. The passages are tangential to the through holes. Two ends of each passage respectively communicate with the through hole and outer side around the main disc. The main disc has a complete bottom face to which a grinding layer can be fully adhered.

Abstract: A circular saw includes a worktable, a blade supporting unit pivotally mounted to the worktable, a saw blade shaft mounted rotatably on the supporting unit and driven by a motor to rotate a saw blade, a driving shaft mounted rotatably on the supporting unit, and a dust collecting member confining a dust passageway which has an intake port in the vicinity of the saw blade, and an outlet port for passage of wood dust. A blower casing is disposed outwardly of the supporting unit, and defines an accommodation chamber disposed downstream of the outlet port and receiving a driving end of the driving shaft. An impeller is mounted on the driving end and is rotatable so as to draw wood dust from the dust passageway into the accommodation chamber and out through a discharge port.

Abstract: A floor machine comprising a motor, a body, and a dust collection system. The dust collection system comprises a skirt, which is coupled to the floor machine and forms a cavity over the body and a floor treatment pad. The skirt includes an air channel device secured to a bottom edge of the skirt. The air channel device encircles the floor treatment pad and comprises a multiplicity of slots between a floor and the skirt. Jointly, the skirt and air channel device confine particles within the cavity. A vacuum for sucking the particles from the cavity creates high velocity air flow through the air channel device. Negative pressure within the cavity prevents particles from escaping. The particles are removed from the cavity through a vacuum tube into the vacuum.

Abstract: A grinding machine includes a driving unit, a grinding wheel unit, an abrasive belt unit and a dust-collecting device. The dust-collecting device includes a dust-discharging unit and a dust-guiding unit. The dust-discharging unit includes a dust-collecting seat disposed fixedly on a side cover of the grinding wheel unit, and a suction fan assembly disposed within the dust-collecting seat. The dust-guiding unit includes a conduit communicated with a dust-receiving chamber in the grinding wheel unit and an accommodating chamber in the abrasive belt unit. The grinding wheel unit, the abrasive belt unit and the suction fan assembly are driven by the driving unit. Dust is induced by the suction fan assembly to move from the dust-receiving chamber and the accommodating chamber into the dust-collecting seat.

Abstract: A sander device includes a platform having an orifice, a chamber and one or more apertures formed in an outer surface and communicating with the chamber. A rotatable sander member is extended through the orifice of the platform, for being driven to abrade or polish or sand objects, and to generate sand dusts. The aperture of the platform is arranged to allow the sand dusts to be drawn or vacuumed into the chamber via the aperture of the platform. A base has a bracket for rotatably supporting the sander member. A plate may be secured to the platform and has an opening aligned with the orifice of the platform, for receiving the sander member.

Abstract: A radial arm saw is adapted with a safety top configured with cutting box enclosure that contains and collects substantially all of the sawdust generated during use. A dust collection system is in fluid communication with the cutting box for removing the sawdust contained therein. Spring biased push blocks function to hold the work piece in place during the sawing process while maintaining the user's hands safely away from the saw blade. A laser alignment device projects a beam within the cutting box along the cutting plane. A control panel is provided to allow use by authorized users upon entry of an authorization code.

Abstract: A power tool with a housing (12) and a tool (18, 22) located thereon such that it is capable of being driven in a rotating and/or oscillating manner, the tool being operable as directed using vacuum flow, in particular using a vacuum cleaner. The power tool is made particularly powerful by the fact that a radial turbine wheel (34) with forward-guiding and rearward-guiding vane rows (44, 48) functions as the drive.

Abstract: A method and apparatus for sizing window coverings slidably extendable from a bay into an aisle of a retail outlet. The method includes the steps of locating the center of the window covering relative to a cutting station utilizing a half scale for removing a portion of the window covering from each of its ends.

Abstract: A manual sander vacuum attachment, providing edge sanding and multiple positioning capabilities, having a lower sanding backer plate member, which carries a soft sanding pad and secures the sandpaper sheet, and an upper housing portion, having a generally horizontal platform with two vertically-extending stanchion supporting a handle therebetween, with a vacuum fitting for connection to a hose for a vacuum air source, and a peripheral skirt surrounding the backer plate member, whereby all vacuum air flow of sanded debris travels about periphery of sander backing plate up into interior of the housing portion.

Abstract: A surface finishing device includes a surface finishing drum having opposing ends and a chamber therebetween, an elongate fixture having a handled proximal extremity and an opposing distal extremity, and a support element, which is carried by the distal extremity and extends through one of the ends of the surface finishing drum into the chamber. An electric motor is disposed in the chamber and is carried by the support element. A drive shaft is also disposed in the chamber and couples the motor to the other of the ends of the surface finishing drum.

Abstract: A belt sander (2) comprising a housing (4) and having a lower sanding surface (40) and an upper sanding surface (42) opposite the first sanding is disclosed. The sander has a larger rear roller (32) driven by a motor (22), a front roller (34) of smaller diameter than the rear roller, and an endless sanding belt (38). A guard (48) is pivotable between a lowered position preventing access to the upper sanding surface and a raised position allowing access to the upper sanding surface. A handle (12) on the housing is pivotable between a first handle position adjacent the upper sanding surface and at least one second handle position further from the upper sanding surface than the first handle position.

Abstract: Dust and debris resulting from the sawing or cutting of concrete masonry units, blocks, bricks, tiles and other masonry products is collected via a three point dust and debris collection system. A movable work supporting table for cooperation with a masonry saw has a grated surface, a vacuum chamber below the grated surface acting as one collection point or area, a heavy debris collection chamber below and in communication with the table vacuum chamber acting as another collection point or area, and a shroud or hood assembly extending rearwardly from the table adapted to extend about the sides and rear of the saw blade and including a vacuum chamber acting as a primary collection point or area. The system is highly effective in achieving dust capture.

Abstract: A concrete engraver apparatus including a carrier for use with a hand-held engraver. The hand-held engraver is detachably mounted to the carrier. The carrier has wheels and a handle attached to an enclosure. The enclosure includes a vacuum mount for attaching a vacuum tube to evacuate loosened particles from the enclosure during operation of the hand-held engraver.

Abstract: A sanding tool 10 includes a block 11 mounting an abrasive member 50, and a shroud 12 which extends around the block and includes a channel 20 which is configured to receive abraded dust. The abrasive member is configured to project beyond an outer edge regions 16 of the shroud 12. The shroud further includes an outlet 21 which is connected to a source of suction, and at least one inlet 22 which is formed as an interruption in the edge regions 16 of the shroud 12. In use, when the sander is located on a planar surface, and suction is applied to the outlet, air is able to be drawn into the channel over the edge region of the peripheral wall and the inlet is configured to introduce a draft through said channel to facilitate clearing of abraded dust from the channel to the outlet.

Abstract: A pneumatic sanding machine includes a body, a pneumatic motor assembly mounted in the body and a control valve detachably mounted in the body to change the path of compressed air that actuates the sanding machine. The control valve includes a first portion selectively closing one of different air passages in the body at a time, a second portion and a neck portion interconnecting the first portion with the second portion. Thus, a dust bag or a vacuum cleaner can be connected to the sanding machine to collect dust or sanding debris so that the sanding machine provides three different ways of dust collection, one of which is not to deal with the powder, the second is to collect the powder into a dust bag, and the third is to vacuum the powder into a vacuum cleaner.

Abstract: A cutting machine includes a bottom collecting tray, a cutting blade overhanging on a cutting table and having a cutting area defined at an outer circumferential portion thereof when the cutting blade cuts the work piece, and an environment control arrangement. The environment control arrangement includes an end collecting tray, which is upwardly extended from the bottom collecting tray, having a collecting chamber for collecting residual particles of the work piece while the cutting blade cuts the work piece, wherein the end collecting tray must be upwardly extended to a position above the cutting area of the cutting blade, and a suction source having a sucking inlet provided at a lower portion of the end collecting tray for collecting the residual particles within the collecting chamber by means of sucking effect.

Abstract: A highly accurate, long-life grindstone for shaping a gear and a method of fabricating the grindstone, without depending on the accuracy of form of a base metal and without using a special grinding machine or a special lapping machine, are disclosed. A super-abrasive layer (29) of a predetermined thickness is fixedly attached on the outer periphery of a body portion (24) of the base metal (23) formed in a cylinder solid. The super-abrasive layer (29) is metal-bonded, and has the outer periphery thereof formed with a toothed portion (31) in the shape of the teeth of an external gear by electric discharge machining.

Abstract: For a power saw, a dust-capturing device having a hollow capture member with openings on each end wherein one end captures dust and the other end discharges the dust into an attached external vacuum device; a support member securable to, and translatable on, the capture member; and a mounting member pivotably attached to the support member at one end and adapted to adjustably secure the capture member to the power saw at the other end.

Abstract: A vacuum cleaner attachment and method of use thereof provides an effective cleaning system for fungi and the like. A vacuum paddle extension enables the attachment to travel into narrow cracks and crevices where fungus may grow and by use of an abrasive and porous pad dislodges such fungus or fungi. When attached to a vacuum system, such as a HEPA (High Efficiency Particulate Air-Filtered) vacuum system, the debris and particulate matter generated by the abrasive process is drawn into the vacuum attachment and into the vacuum system where it is removed from the air which is then expelled by the vacuum system. Better cleaning of surfaces afflicted with fungi, molds, and the like is then achieved in a manner that is safer and more effective.

Abstract: The systems for reducing dust emissions include a dust catch. In some cases, the dust catch includes an inlet and a discharger. The inlet can be arranged so that it surrounds an abrasive surface of an abrasion device, such as a sander. Dust generated by the abrasion surface can be captured in the inlet and discharged by the discharger. In various cases, the inlet is associated with a skirt including a dust screen. The methods can include attaching a dust catch to an abrasion device such that an inlet of the dust catch encompasses at least a portion of an outer perimeter of an abrasion surface associated with an abrasion device. The abrasion device can then be operated and at least a portion of dust generated by operating the abrasion device is captured by the dust catch.

Abstract: A machine (10) for performing a working operation such as cutting on a workpiece. The machine (10) has a tool (19) for performing the working operation and a drive motor (13) operable to drive the tool. The drive motor (13) has an exhaust (17) through which an exhaust fluid is discharged during operation. Means (51) are provided for delivering a dust suppression fluid such as water into the vicinity of the tool (19) for suppressing dust generated thereby. A shroud (31) is disposed about the tool (19) for containing dust and the dust suppression fluid, and an extraction line (61) communicates with the shroud (71) for extracting dust and dust suppression fluid contained thereby, as well as air within the shroud. The extraction line (61) further communicates with the exhaust (17) of the drive motor (13) for receiving the exhaust fluid discharging therefrom, the exhaust fluid mixing with the air strength flowing from the shroud.

Abstract: A hand power tool (10), in particular with integrated dust removal, that comprises a housing (12) on which a dust tube (22) is mounted that is capable of being interconnected with a dust box (24) by means of its dust inlet connection piece (26), whereby a side wall (27) of the dust box (24) has through holes (25) that are reached over by a filter in dust-tight fashion, becomes less expensive and more environmentally friendly by the fact that the filter (30, 31, 32, 33, 34, 35, 36, 37, 38, 300) is formed by a flat sheet composed of a fine-pored material, the surface area of which is increased by means of certain structures.

Abstract: A dust abatement vacuum hood, provided for a flush-cutting concrete saw, includes a rigid shell that is preferably either vacuum formed or injection molded from a tough polymeric material that may be reinforced with structural fibers. Alternatively, the vacuum hood may be stamped or cast from a durable metal. The vacuum hood is equipped with a vacuum port to which one end of a vacuum hose may be attached. The opposite end of the vacuum hose is attached to a vacuum cleaner system. The vacuum hood has a spring-mounted attachment bracket that can be bolted directly to the concrete saw. As the blade of the concrete saw rotates, pulverized concrete is discharged into a chamber opening of the vacuum hood. Internally, the vacuum hood is shaped so that the pulverized concrete is directed toward the vacuum port, from where it is directed to the vacuum cleaner system.

Abstract: The invention is in a vacuum driven sander that is appropriate for drywall sanding, that utilizes a vacuum flow pulled therethrough to drive a turbine that includes an adjustable lock mounting through a bearing assembly to an eccentric to turn the eccentric that is connected to oscillate a sanding pad that mounts a section of sanding material, and that vacuum air flow also provides for removing sanded particles off from the sanded surface that are transported through the sander and a connected pipe or hose into a catchment container.

Abstract: The dust removal device comprises a fan (18), a dust collection receptacle (24), and a suction passage (28). The dust collection receptacle (24) equipped with a dust filter (26) is located in the path of air flow (34, 36) between the suction passage (28) and the fan (18). The dust is therefore filtered out of the air stream before it reaches the fan, which prevents dust-induced wear. It is also possible to use the same fan for engine cooling as well as dust removal.

Abstract: A structure for a polishing machine of an optical disk, which comprises a motor, a turntable unit integrated with a housing, at least two polishing wheel positioned on a cover which can cover up the housing, and a timer. When the cover is closed, the polishing wheel can polish the optical disk. The primary objective of this invention is to provide a structure for a polishing machine with a precise polishing effect and higher automation to increase the quality of polishing. The secondary objective of the present invention is to provide a structure for a polishing machine which is simplified in structure, miniaturize in volume and is easily stored and used.

Abstract: A dust and chip removal device for sanding hand power tools has a storage container securable to a hand power tool, a transport channel via which dust and chips are directed into the storage container, a retaining element preventing the dust and chips from flowing back out of the storage container, the retaining element having at least one passage, an elastic element which has a holding force closing the at least one passage, the passage being openable automatically against the holding force at starting at a certain delivery pressure, while the elastic element automatically closes the passage below a certain delivery pressure, and a channel having cross-sectional area which tapers toward the passage.

Abstract: A process for the fractional production of alkyltin oxides which comprises the steps of:subjecting a mono-, di- or trialkyltin halide to continuous hydrolysis at a temperature between 30.degree. to 100.degree. C. for a period of 10 minutes to 3 hours by the use of a 1% to 50% aqueous solution of a basic substance, thereby forming in the hydrolysis reaction mixture a dialkyltin oxide having an average particle diameter of 10 .mu.m or more, provided that where an intended alkyltin oxide is solid, the continuous hydrolysis is performed in the presence of an organic solvent slightly soluble in water and having a boiling point as measured under ordinary pressure of 150.degree. C. or lower and a specific gravity of 1.1 or smaller;allowing the resulting reaction mixture to stand, thereby to form three phases composed of an organic phase, an aqueous phase, and a phase consisting substantially of the dialkyltin oxide and having a specific gravity 0.