Abstract: Apparatus includes a first member and a second member. The first member includes a first surface and the second member includes a driven member. The second member is movable relative to said first member between a first position and a second position, wherein the driven member is closer to the first surface in the second position than in the first position. The second member includes an inlet, an outlet, and an enclosed pathway between the inlet and the outlet. A collector is movably coupled to the second member at the inlet and communicates with the inlet.

Abstract: A chip collecting apparatus for a tip dresser of the present invention has a sideways-mounted dresser main body and a chip pickup case mounted at the end of the dresser main body. Chips generated during dressing electrode tips are picked up in the case and discharged from the chip discharge port opened under the case into a chip collection vessel. A pair of opposite electrode tips held at the ends of a welding gun advances horizontally from the front. Since chip inserting surfaces of the chip pickup case, in which chip insertion ports for receiving the electrode tips are opened, are formed in a wedge shape extending from the front end to the rear end with respect to the advancing direction of the welding gun, the electrode tips can be smoothly guided to the chip insertion ports without unnecessarily increasing the space between the electrode tips.

Abstract: A wood planing machine includes a support carriage movably mounted on two sides of a mounting frame for supporting a cutting shaft. A motor housing and a shaving collecting member are disposed on the carriage. The collecting member confines a shaving passageway along the cutting shaft, and has an outlet port adjacent to one side. An air conduit is disposed for passage of introduced air into the shaving passageway from the other side to enhance entraining of wood shavings. An air stream deflecting member is disposed to deflect air stream to pass by the outlet port for onward movement to a blower.

Abstract: A wood planing machine includes a rotatable cutting member mounted on an upper end of a machine frame and driven by a first output shaft of a motor which is mounted on a lower end of the machine frame. A shaving collecting member confines a duct with an intake port disposed in the vicinity of the cutting member and an outlet port disposed adjacent to the lower end of the frame. A drive transmission member transmits the driving force of a second output shaft of the motor to a drive shaft of a blowing mechanism to rotate an impeller for drawing wood shavings from the shaving collecting member into the blowing mechanism and out of a discharge port.

Abstract: A finishing orbital sander (1) includes a main body (2) and a base (12) provided below the main body. Provided between the main body and the base are a plurality of foot assemblies (22). Each assembly in turn includes a cylindrical or columnar foot (23) made of aluminum and a pair of rubber O-rings (25) at both ends of the cylindrical foot. Each foot additionally includes reduced diameter sections (24) at both ends, where the O-rings are disposed. The reduced diameter sections (24) are fitted in the O-rings and placed in recessed seats (26) provided in opposing surfaces of the main body (2) and the base (12), thus elastically supporting the aluminum feet (23) in the axial direction thereof. The axial dimension of each reduced diameter section (24) is made no longer than the thickness (i.e., the axial dimension) of the O-ring (25), so that the tip end of the reduced diameter section does not exceed or project from the axial outermost end of the O-ring.

Abstract: A polishing plant including a polishing apparatus having a top ring for holding a workpiece and a turn table for polishing a surface of the workpiece held by the top ring. A cleaning apparatus has cleaning machines for cleaning the workpiece polished by the polishing apparatus. At least one drainage pipe connected to the polishing apparatus discharges a waste liquid from the polishing apparatus, and at least one drainage pipe connected to the cleaning apparatus discharges a waste liquid from the cleaning apparatus are provided as separate plural drainage pipe lines, depending on the type of waste liquid. By use of the polishing plant of the present invention, treatment of waste liquids can be efficiently conducted.

Abstract: A grinding device includes a grinding wheel member driven by an output shaft of a motor. A drive transmission member transmits the driving force of the output shaft to a rotating shaft to operate a blowing member when the motor is actuated. A dust collecting member is disposed in the vicinity of the grinding wheel member for collecting dust during a grinding operation. An elongated hollow member is disposed between the collecting member and the blowing member so as to draw dust from the collecting member to the blowing member.

Abstract: A workpiece such as a semiconductor wafer is polished by pressing the workpiece against a polishing surface under a predetermined pressure. A polished surface of the workpiece is processed by pressing the workpiece against a processing surface under a predetermined pressure while the processing surface makes circulatory translational motion along a predetermined path. The processing surface comprises a surface of a polishing cloth or a surface of an abrading plate, and the polished surface of the workpiece is further polished or cleaned.

Abstract: A polishing table 11 in the CMP apparatus 10 has a diameter smaller than the diameter of a polishing pad 12. The polishing pad 12 is disposed on the polishing table so as to cover the entire top surface of the polishing table 11. A space 13 is formed between outside of the outer peripheral surface of the polishing table 11 and under the outer peripheral bottom surface portion of the polishing pad 12 projecting outside from the edge of the polishing table 11. A trough 14 with an opening 14a on top thereof as a device for withdrawing the used slurry is disposed around the outer peripheral surface of the polishing table 11 so as to be located a part thereof in the space 13.

Abstract: The combination of at least a first base, a first machine tool assembly placed in an operative position on the at least first base, and a second machine tool assembly placed in an operative position on the at least first base above the first machine tool assembly.

Abstract: A pad sander skirt which flares out over the periphery of the sanding pad and which is coupled to a lower housing so that it swivels about the body of the sander. The skirt and lower housing can be selectively swivelled in a rotational manner to a position desired by the user. A further sander improvement disclosed relates to the protection of a user's hand. Palm-grip random orbit sanders are sometimes configured so that the sanding pad may begin spinning at high speed when the sander is lifted off of the work. To this end, the present application discloses a protective skirt which flares out over the periphery of the pad in a palm-grip random orbit sander. Also disclosed is an improved dust collection system comprising a filter housing formed of a rigid porous material for entrapping dust.

Abstract: A device for cutting a workpiece by means of a rotatingly driven tool bit has a suction hood surrounding the tool bit in annular manner with a through-opening for the tool bit to pass through. The suction hood forms a suction duct open to the tool bit which is limited by an outer wall. At least a part of the outer wall is curved in a perpendicular plane in the form of a parabola, and the focal point of the parabola lies beneath the workpiece engagement surface formed by the suction hood. Because of this parabola shape, chips thrown by the tool bit against the outer wall are reflected essentially parallel to the workpiece engagement surface and thus do not escape up through the through-opening.

Abstract: A pad sander skirt which flares out over the periphery of the sanding pad and which is coupled to a lower housing so that it swivels about the body of the sander. The skirt and lower housing can be selectively swivelled in a rotational manner to a position desired by the user. A further sander improvement disclosed relates to the protection of a user's hand. Palm-grip random orbit sanders are sometimes configured so that the sanding pad may begin spinning at high speed when the sander is lifted off of the work. To this end, the present application discloses a protective skirt which flares out over the periphery of the pad in a palm-grip random orbit sander. Also disclosed is an improved dust collection system comprising a filter housing formed of a rigid porous material for entrapping dust.

Abstract: A chain saw for aggregate material has a nozzle that provides a spray of water to that portion of the saw chain that is traveling between the guide bar and the drive sprocket. The flooding provided by the nozzle washes slurry off of the saw chain. A basin with inclined baffles is provided to collect the slurry carried by the saw chain into the housing. Apertures are provided in the basin for discharging the collected slurry.

Abstract: A method and apparatus for a dust collecting work station that utilizes a positive pressure air flow to entrap particulate material from within the work station. The dust collecting work station is especially suited for use by dental technicians, goldsmiths and jewelers. The work station can be economically manufactured, operated with typically available compressed air supply, and can be constructed to fit upon a table top. The dust collecting work station includes a collection base with a back shield that together enclose a work area. A positive pressure air flow is provided to the work area for removing particulate material by impacting the particulate with the positive pressure air flow. A filter media positioned proximately to the collection base entrains the particulate material that is knocked down by the positive pressure air flow. The positive pressure airflow can be supplied by a nozzle located proximate to the face of a user or supplied by a nozzle located proximate to the back shield.

Abstract: There is provided a structure for use in a power driven tool (1) for collecting dust generated by the operation of the tool. The structure includes: an outer housing; a commutation motor (5) disposed within the housing and including a main shaft (6) which has a tip end and a commutator (7) on the main shaft; a pair of brush assemblies (29) radially disposed around, and in contact with, the commutator of the motor; and a dust collecting fan (9) mounted on the main shaft of the commutation motor. The fan is disposed between the commutator and the outer housing. Also included are a dust intake passage (28) formed within the housing and having an intake (27) formed adjacent the location where dust is generated by the operation of the tool; a dust discharge passage (46) formed within the housing and having an outlet; and a dust chamber (43) formed substantially between the outer housing and the commutator for containing the dust collecting fan.

Abstract: A power cutter which comprises a main body provided with a motor, a work-cutting portion including a circular cutting blade to be rotated by the motor and a safety cover covering both sides of an edge portion of the cutting blade so as to form a dust-discharging passageway, a fan attached to the safety cover for sucking and removing dust generated during cutting operations through the dust-discharging passage, a barrier wall attached to the safety cover so as to intercept the dust-discharging passageway, and a main dust-sucking port and a supplementary dust-sucking port disposed respectively in front of and behind the barrier wall as viewed in the rotational direction of the cutting blade.

Abstract: A disc sander having a scroll type vane pump embodied in a shroud enclosing the back side of a sanding disc. The inlet ports of the pump are coupled by a manifold to a location adjacent to the front face of the sanding disc at a location where the sanding dust and debris are generated. A tortious serpentine path is provided about the periphery of the pump housing which reduces pump noise and increases pump efficiency. The fins of the vane pump are provided on the back side of the sanding disc.

Abstract: A mixture of water and glass beads is ejected to a root of a gear which has been cut to form gear teeth. The glass beads are oriented so as to be ejected to the root, and the glass beads and the water impart compressive stresses to the surface of the root and grind the surface of the root.

Abstract: A grinding wheel shield for a semiconductor wafer edge grinding machine formed with a flat upper surface having a central aperture therein for accommodating the grinding wheel shaft and motor of the grinding machine on which the shield is installed, an open keyway slot leading from the central aperture to an adjacent edge of the shield, a depending flange extending from at least a portion of the periphery of the upper surface, and at least one positioning member projecting from the depending flange, the shield being a unitary member machined from a single block of resilient polymeric material, and a sheet of resilient material disposed on top of the flat upper surface with an opening aligned with the central aperture of the shield and a slit extending from the opening over the keyway slot to the edge of the shield such that the sheet forms at least one flexible flap over the keyway slot.

Abstract: A compact catcher assembly (20) for an abrasive waterjet having a nozzle assembly (22) and a jewel orifice (not shown) for producing a high velocity fluid jet (26) to cut a workpiece within a small area in which to receive the catcher assembly, such as between the upper and lower flanges (28) and (30) of an I-beam (32). The catcher assembly includes a deflector block (42) having an upper surface (62) defining a perimeter, a lower surface (64), and a cylindrical side surface (60) vertically spacing the upper surface from the lower surface. The upper surface has a vertically extending first inlet port (68), while the side surface defines a first exhaust port (74) extending horizontally through the side surface. The deflector block includes an inlet channel (66) extending normally from said entry port to a predetermined distance within the deflector block to define a bottom surface (70) opposite the entry port.

Abstract: A sander includes a sander body, a motor held by the sander body, a pad operably connected to the motor so as to impart an orbital motion to the pad, a housing swivellably attached to the sander body, and bumped structure between the housing and the sander body. The bumped structure is constructed and arranged for imparting friction between the housing and the sander body to increase a force required to swivel the housing about the sander body. A groove having a wall is defined in at least one of the housing and the sander body, and the bumped structure includes a plurality of protuberances along the wall of the groove. The housing includes a dust exhaust channel attached to a filter housing, and the filter housing includes a rigid, porous material having a pore size effective for entrapping dust which enters the filter housing.

Abstract: A pad sander skirt which flares out over the periphery of the sanding pad and which is coupled to a lower housing so that it swivels about the body of the sander. The skirt and lower housing can be selectively swivelled in a rotational manner to a position desired by the user. A further sander improvement disclosed relates to the protection of a user's hand. Palm-grip random orbit sanders are sometimes configured so that the sanding pad may begin spinning at high speed when the sander is lifted off of the work. To this end, the present application discloses a protective skirt which flares out over the periphery of the pad in a palm-grip random orbit sander. Also disclosed is an improved dust collection system comprising a filter housing formed of a rigid porous material for entrapping dust.

Abstract: A dust collection nozzle (12) is provided through the upper blade guard 7 of a circular saw (1). The dust collection nozzle (12) includes a flared, horn-shaped dust capturing section (13) having a rectangular opening at the front end thereof, and a cylindrical dust outlet tube (14) connected to the rear end of the dust capturing section (13). Throughout cutting operations, the opening (16) remains directed toward the lower portion of the saw blade (8) so as to collect dust and other debris generated from a saw blade (8) rotatable attached to the upper blade guard. The dust collection nozzle (12) also includes a pair of dust guide plates (17, 18) formed on and extended from the opening (16). The dust guide plates (17, 18) extend in parallel to each other so as to interpose the saw blade (8) therebetween. Furthermore, provided to the right of the dust guide plate (18) is a flow straightening plate (19) extending in parallel to plates (17) and (18) from the upper to lower edges of the opening (16).

Abstract: A containment system for containing media and contaminants within an area adjacent a surface to be treated, comprising a barrier located proximate the surface and an elongate flexible member defining a perimeter of the area. An access port is provided in the barrier to allow application of a media to the surface, and an exhaust device is provided to create a negative pressure within the contaminant area and remove the media and/or contaminants from the area.

Abstract: A pad sander skirt which flares out over the periphery of the sanding pad and which is coupled to a lower housing so that it swivels about the body of the sander. The skirt and lower housing can be selectively swivelled in a rotational manner to a position desired by the user. A further sander improvement disclosed relates to the protection of a user's hand. Palm-grip random orbit sanders are sometimes configured so that the sanding pad may begin spinning at high speed when the sander is lifted off of the work. To this end, the present application discloses a protective skirt which flares out over the periphery of the pad in a palm-grip random orbit sander. Also disclosed is an improved dust collection system comprising a filter housing formed of a rigid porous material for entrapping dust.

Abstract: A polishing machine comprising a frame, an upper and a lower working wheel each having opposing working surfaces, at least one of the working wheels being rotatably supported by the frame and driven by driving means, with a plurality of runner wheels being located between the working surfaces of the upper and the lower working wheel, the runner wheels having aperatures for the accommodation of work pieces and a toothing at the circumference thereof, an outer and an inner circular row of equally spaced pins, the pins being retained by a respective pin ring, the toothing of the runner wheels engaging the outer and the inner row of pins for the forward and rotating movement of the runner wheels if at least one of the row of pins is rotated, second driving means for the rotating row of pins, a source for the supply of working fluid and/or rinsing fluid between the working surfaces, interception means on the outer and the inner side of the working wheels, with the outer of the interception means being formed by a

Abstract: A manually operated sander especially useful in sanding dry wallboard ceilings including a bottom surface below an abrasive sanding screen of metallic mesh interstices, consisting of a plurality of perforations of much greater predetermined size, and predeterminedly spaced between its defining edges to allow dust particles to fall within a collecting chamber of which it forms a part, to be thereafter disposed of by accessing a hatch formed within the chamber. A pair of flaps of unequal length within the chamber serve to reduce spillage of the dust collected when the housing is tilted in being carried about.

Abstract: An apparatus for removing excess material, such as spur bits or sprues, from workpieces, provided with a support surface having a guide channel therein for receiving excess material therein for guiding to a rotatably driven removal tool having a peripheral cutting or grinding segment submerged in a slot in the support surface and which is mounted for selective movements in parallel as well as normal to its rotational axis to allow adjustments to compensate for changes in the size or kind of tool as a result of wear or replacement. While not so limited in its application, the apparatus is of particular use for removing spur bits or sprues from workpieces.

Abstract: An abrasive, sanding and/or surface finishing apparatus designed to extend the useful life of abrasive material which employs a dual-platen arrangement having a particulate removal system designed to effectively remove particulate from the working area of the machine. Specifically, the particulate removal system is designed to remove particles from the surface of the work in the area of the gap created between the twin platens, with a secondary particulate removal system designed to remove material from the work following treatment by abrasive from both platens. The inlet port of the particulate removal system interposed between the platens is designed to occupy a substantial portion of the area within the gap zone between the platens. In addition to increasing the useful life of the abrasive, the particulate removal system reduces the release or discharge of dust into the ambient.

Abstract: A self-contained mobile painting and maintenance platform for recovery of steel grit blast media used in the pressurized cleaning of bridge structures prior to repainting. The painting and maintenance platform is positioned on vehicle with deck extensions that expand to form a large barrier free support and recovery surface and collection troughs to recover spent grit and shot via gravity collection chutes.

Abstract: A shielding device for shot blasting or shot peening chambers comprising a shot retention chamber, preferably with multiple interior compartments formed by divider walls, which retains a protective layer of shot to absorb the high energy impact of high velocity shot particles, the shot layer being retained by magnetic or electrically enhanced magnetic means such that the shot retention chamber can be mounted at any angle up to 90 degrees above or below horizontal.

Abstract: A motor is housed in a main body and a transmission gear of a series of three transmission gears is mounted to a motor shaft. The last of the series of transmission gears is mounted on one end of an elongated and distortable connection rod. A first bevel gear is attached to the other end of the connection rod. A second bevel gear, which in engagement with the first bevel gear, is attached to one end of a spindle. The spindle extends in a direction perpendicular to the direction in which the connection rod extends. A wheel shaped bit is attached to the other end of the spindle. Rotation of the motor is transmitted to the bit via the three transmission gears, the connection rod, the two bevel gears, and the spindle. To cut a workpiece, the rotating bit is repeatedly moved back and forth into the surface of the workpiece. A handle is attached to the main body and extends in a plane which contains an axis of the motor shaft.

Abstract: A self-contained mobile painting and maintenance platform for recovery of steel grit blast media used in the pressurized cleaning of bridge structures prior to repainting. The painting and maintenance platform is positioned on vehicle with deck extensions that expand to form a large barrier free support and recovery surface and collection troughs to recover spent grit and shot via independent auger systems within the troughs.

Abstract: An oscillating tool for sanding a surface has a body (12) defining an internal cavity (14) and a motor (20) located therein The motor has a motor shaft (22) oriented in parallel with the body. A crank (24) is affixed to the motor which has a crank pin (26) projecting therefrom. A lever arm (34) is pivotably affixed to the body for rotation about a pivot axis generally perpendicular to the motor shaft. The lever arm cooperates with the crank pin to cause the lever arm to cyclically pivot back and forth. A pad support (18) is adapted to receive a work member (19). The planar pad support is affixed to the lever arm at a location spaced apart from the pivot axis and oscillated therewith. The pad support has a substantially 90 degree forward corner (110) formed by a pair or facet edges and a pair of outwardly inclined straight side edges (116, 118).

Abstract: A shaft sanding device including a main housing. A motor is secured within the main housing. The motor is coupled with a power source. A drive roller is secured within the main housing. The drive roller has a drive arm extending outwardly therefrom to couple with the motor. A first idle roller is secured within the main housing opposed from the drive roller. In association with the first idle roller is a second idle roller having a resilient arm rotatably coupled therewith. The resilient arm is pivotally coupled to the main housing adjacent to the motor secured therein. The resilient arm biases the second idle roller away from the main housing. A sand paper belt is disposed around the drive roller, the first idle roller, and the second idle roller.

Abstract: Sanding accessory for a conventional belt sander or the like, enabling manually held workpieces to be sanded to a super-smooth finish without rounding off their edges. A workpiece held by hand sideways against a fence parallel to the direction of travel of the belt moves forward by belt friction to a crosswise face of the fence and is retained there as the fence reciprocates laterally across the belt and back, sanding the workpiece evenly and distributing the belt wear uniformly over substantially its entire abrasive surface.

Abstract: A grinding machine includes a casing with a top plate unit, two grinding units installed on the top plate unit, and a driving unit for activating the grinding units. The top plate unit has a dust inlet slot formed therethrough so as to permit dropping of dust from the corresponding grinding unit into the dust inlet slot. The casing has two side chambers communicated with the dust inlet slots, and a middle chamber which is located between the side chambers and which receives a filtering unit therein. A dust-collecting chamber is located in a bottom portion of the casing and is communicated with the side chambers and the middle chamber. An exhaust fan unit is disposed in the middle chamber and is located over the filtering unit to draw dust from the dust-collecting chamber in order to discharge the same from the casing.

Abstract: The invention is a workbench consisting of a top working surface containing a rows and columns of holes that allow dust and chips to fall and be drawn through where they land in a plenum below the surface. The top surface and the plenum are supported by a rectangular frame that includes four legs and a shelf between the plenum and the bottom of the legs. The shelf supports a doorless cabinet that includes areas for storing tools and supplies. The plenum slopes to a point containing an off center aperture which is connected through an adapter to a vacuum cleaner. The vacuum cleaner has a bifurcated input manifold with gate valves which allows the user to select between applying the vacuum to the plenum or applying the vacuum to a hose containing a vacuum cleaning tool where waste not entering the surface apertures will be removed from the top work surface.

Abstract: A self-contained mobile painting and maintenance platform for recovery of steel grit blast media used in the pressurized cleaning of bridge structures prior to repainting. The painting and maintenance platform is positioned on vehicle with deck extensions that expand to form a large barrier free support and recovery surface and collection troughs to recover spent grit and shot via independent auger systems within the troughs.

Abstract: Apparatus for supporting and containing a dental prosthesis during the micro-etching thereof is disclosed. The apparatus includes a framework, a holding mechanism carried by the framework for holding the prosthesis in a position which permits micro-etching, and a flexible hood, for example, a disposable plastic bag, which has an open end sized to slidably receive the framework into the hood while holding the prosthesis. The open end is sealable while the framework is so received, and the hood is transparent to permit viewing of the prosthesis within the hood. The hood is sliceable with a knife edge to provide a small slit which permits the tip of a micro-etching tool to extend into the hood. Alternately, the hood may be pre-slit for the same purpose.

Abstract: A pad sander skirt which flares out over the periphery of the sanding pad and which is coupled to a lower housing so that it swivels about the body of the sander. The skirt and lower housing can be selectively swivelled in a rotational manner to a position desired by the user. A further sander improvement disclosed relates to the protection of a user's hand. Palm-grip random orbit sanders are sometimes configured so that the sanding pad may begin spinning at high speed when the sander is lifted off of the work. To this end, the present application discloses a protective skirt which flares out over the periphery of the pad in a palm-grip random orbit sander. Also disclosed is an improved dust collection system comprising a filter housing formed of a rigid porous material for entrapping dust.

Abstract: The method and apparatus of removing metallic particles of magnetic material from coolant fluid used in a machining operation includes placing an assembly including elongated magnets (A) in elongated covers (B) constructed of a non-magnetic plastic with sealing and reinforcing members preventing direct attachment of metallic particles to the magnet facilitating removal of the particles when the assembly is removed from the coolant fluid.

Abstract: A portable planer for use by a user to cut chips or material from a workpiece is disclosed. The portable planer includes a chip deflector movably attached to a housing of the portable planer. The nozzle can be oriented with respect to the housing such that chips expelled from the portable planer are directed away from the user and downwardly toward a floor. Alternatively, the chip deflector can be reoriented with respect to the housing so that a collector bag or vacuum hose can be attached to the nozzle whereby chips are collected in an enclosed container rather than being freely blown. Ideally, the nozzle is swivelably attached to the housing to permit the selected positioning of the nozzle relative to the housing.

Abstract: A device for clearing material waste from telescopic plates of a cutting machine and includes an affixing element and a clearing rubber mounted to an underside of each telescopic plate. The affixing element has at least one groove to hold the clearing rubber which has a clearing edge and sliding surfaces. The clearing edge clears material waste from the upper surface of its adjacent plate, when the plates are retracted.

Abstract: A palm grip random orbital sanding machine having a housing and an electric motor disposed in the housing which drives an attached platen along a random orbital path. An exhaust fan disposed in an exhaust chamber produces an air flow from the vicinity of the platen out through an exhaust port. The housing has a pair of longitudinal slots provided on opposite sides thereof which removably receive the legs or side members of a U-shaped debris container. Each side member of the debris container has an entrance port coincident with the exhaust port of the exhaust chamber, and means for filtering the debris from the air flow exiting the side members. The commutator and brushes of the electric motor are disposed intermediate the longitudinal slots and the brushes are disposed parallel to the longitudinal axis of the sanding machine.

Abstract: The shield of this invention has a skirt that is tilted or slanted forward which, together with longer bristles, provides a substantial improvement in these type devices. Also provided in the shield of this invention is an adjustable, slanted clamp that can be adapted for connection to various size sanders. A baffle is also included within the shield to form a tunnel effect which enhances suctioning or vacuuming off of debris resulting from the sanding operation.

Abstract: A dust collection bag 1 for a power tool comprises a box-like container 10 which is separable into two parts 11, 12 along a plane of the box-like container and the interfitting portions 13, 14 of the two parts are rigid. One part 11 which is suitably a rigid plastics moulding has means 15 for connecting the container to the power tool outlet and the other part 12 has at least part of its wall surface formed of filter material 12a. The parts 11, 12 may be hinged together 16 and have connection means 17, 18 for releasably connecting them to close the container (FIG. 1).