`
`«aK Patent Application ..GB «2035787 A
`
`
`
`(21) Application No 7938769
`(22) Dateoffiling
`8 Nov 1979
`(30) Priority data
`(31) 78/44154
`(32) 11 Nov 1978
`(33) United Kingdom (GB)
`(43) Application published
`25 Jun 1980
`(51) INT CL? A4L 5/18
`BO4B 5/04 9/00 //
`A47L 9/16
`(52) Domestic classification
`A4F 11A1 12D 12E 12H
`B2P 10B2A3 4 6X 8C
`F4X A2D A2G
`(56) Documentscited
`GB 1489478
`GB 1452435
`GB 1391373
`GB 1331064
`GB 1319454
`GB 1211930
`GB 767232
`GB 508512
`
`(58) Field of search
`A4F
`FAX
`
`(71) Applicants
`L & H Designs Limited
`64 High Street
`Tewkesbury
`Gloucestershire
`GL20 5BL
`Henry McKnight Merritt
`Westman House
`Westmancote
`Tewkesbury
`Gloucestershire
`(72) Inventor
`Henry McKnight Merritt
`(74) Agents
`S$ Jones-Robinson
`
`(54) Suction cleaning device
`
`(57) A hand-held suction cleaning
`device has a suction pipe (7) lead-
`ing to a cyclone separator (2) with
`an annular separator chamber(3)
`
`chable container(5).
`
`into which pipe (7) feeds tangenti-
`ally. The chamber(3) exhausts to
`atmosphere througha central ex-
`haust pipe (15) and an upper ex-
`haust chamber (19). Pistol-grip han-
`dle (1) has trigger control member
`(14) which operates air valve (13)
`controiling the air flow from inlet
`connection (12), which can be cou-
`pled to a compressed air supply, to
`nozzle (9) through pipe (10). Nozzle
`(9) is formed in the upper wall of
`pipe (7) adjacent the inlet end of
`the fatter, and it producesan air jet
`which discharges into pipe (7) to
`produce anair flow therealong to
`separator chamber(3) and a resul-
`tant suction at the inlet end of pipe
`(7). Solids picked up by this suction
`are transported in the air stream
`along pipe (7) and separate outin
`chamber(3) from which theyfall by
`gravity through funnel (4) into deta-
`
`VL8LGEOCAS)
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`GB 2035 787A 1
`
`SPECIFICATION
`
`Suction cleaning device
`
`An air blast nozzle may be provided which
`is operable to dislodge solid matter which is
`subsequently picked up by the suction of the
`device, for example to dislodge swarf from a
`70 blind hole or recess in a component. This air
`This invention relates to cleaning devices of
`the type which employ suction to pick up
`blast nozzle may be concentric with, or other-
`solid matter which is transported in an air
`wise positioned with respect to, a detachable
`flow to a bag or container in whichit collects
`suction nozzle of the device and said ON/OFF
`for disposal.
`air valve may simultaneously supply the air
`75 blast nozzle and the suction air jet. Alterna-
`Devices ofthis type are not, generally
`speaking, suitable for workshop use as they
`tively, the air blast nozzle may have its own
`do notsatisfactorily handle oily metal such as
`air supply controlled along with the suction air
`the swarf produced by machine tools. The
`jet by a two-position trigger control valve
`cleaning out of oily swarf from the T-slots of
`operable to supply the air jet, and thus apply
`80 suction, first, and then to apply both an air
`lathes, milling machines and thelike is a
`common workshop problem. This swarf nor-
`blast and suction should this be necessary.
`mally has to be dislodged and brushed out by
`A general-purpose suction cleaning device
`hand.
`designed with the problem of clearing out the
`The object of the invention is to provide a
`T-slots of machine tools particularly in mind is
`portable hand-held suction cleaning device
`85 illustrated, by way of example, together with a
`which is particularly suitable for workshop
`modification, in the accompanying drawings
`use, for example to clear out the T-slots of
`and will now be described with reference
`machine tool slides and tables.
`thereto. In the drawings:
`According to the invention a hand-held suc-
`Figure 7 is a plan view of the device;
`25
`tion cleaning device has a suction pipe lead-
`90=Figure 2is a suction-inlet end view, with a
`ing to a cyclone separator which exhausts to
`container of the device partly cut away;
`atmosphere and is disposed above a container
`Figure 3 is a sectional view on the line
`for solids which are in use picked up at an
`Itl-IIl in Fig. 1; and
`inlet end of the pipe and separated out in the
`Figure 4 is a fragmentary sectional view, on
`95 the samesection line, showing the modifica-
`separator, and an air inlet connection for
`tion.
`coupling to a compressed-air line and which
`supplies an air jet which discharges into the
`The hand-held device ilustrated in Figs. 1
`suction pipe to produce an air flow therealong
`to 3 has a stock 1 (shown partly cut awayin
`to the separator with resultant suction at the
`Fig. 3) which providesa pistol grip and to
`100 whichis attached a cyclone separator cham-
`inlet of the pipe.
`Preferably a detachable nozzle at the end of
`ber 3 disposed coaxially above a frusto-conical
`the suction pipe provides the suction inlet,
`discharge funnel 4. A detachable circular
`and this nozzle may be oneof a range of
`blow-moulded polythene container 5 has a
`interchangeable nozzles which are differently
`neck 5a which fits into a bottom skirt 2a of
`105 the separator 2, the funnel 4 projecting a
`shaped to suit a variety of applications. A
`device in accordance with the invention has in
`short distance down into the container 5.
`practice proved extremely useful for clearing
`A suction pipe 7 enters the cyclone cham-
`out machine tool T-slots, and for this purpose
`ber 3 tangentially at one side of the device,
`an elongated rectangular cross-section nozzle
`and an interchangeable inlet nozzle 8 (shown
`is most suitable.
`110 in broken lines) is a push fit on the end of the
`The device preferably has a piston-grip han-
`pipe 7. The inlet nozzle shown is of elongated
`dle with ON/OFFair valve controlling the air
`rectangular cross-section, which is particularly
`jet and operated by a conveniently situated
`suitable for clearing swarf out of T-slots. An
`trigger control member. A pre-settable needle
`air jet nozzle 9, formed by semi-piercing the
`valve may also be provided for adjustable
`115 upper wall of the tube 7 adjacentthe inlet
`throttling of the air flow to the jet, whereby to
`end thereof, discharges into the separator 2
`provide optimum performancefor picking up
`with the resultant production of a vacuum at
`different solid materials. The separator may
`the inlet nozzle 8.
`exhaust at the top and to the side away from
`The jet nozzle 9 is supplied by an air supply
`the operator, and the container is preferably
`120 pipe 10 leading from a valve block 11 at the
`readily detachable from the separator for emp-
`top of the stock 1. At the block 11 an inlet
`tying when full.
`connection 12 enables the pipe 10 to be
`A discharge funnel may be provided below
`connected to a compressed-air line through an
`the separator to discharge into the container,
`ON/OFF valve 13 housed in the block 11.
`and this funnel may have an end section with
`125 The valve 13 is normally OFF andis actuated,
`a lip for attachment of a polythene bag by
`to operate the device, by a trigger control
`member 14 mountedin the stock 1.
`meansof an elastic band in place of the
`container. This provides ready and safe dis-
`A tubular exhaust outlet pipe 15 mounted
`posal of contaminated material collected by
`centrally of the separator 2 projects upwardly
`the device.
`130 from and downwardly into the chamber 3 to a
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`GB2035787A “2
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`level below the port of entry 16 of the tube 7
`into the chamber 3. The exhaust pipe 15 has
`side outlets 17 at an upperfevel and is
`capped by a closure plate 18 which closes the
`top of the pipe 15 and surrounding exhaust
`chamber 19 which in turn discharges to atmo-
`sphere forwardly, and thus away from the
`operator holding the stock 1, through anair
`discharge aperture 20.
`The stock 1, separator 2, funnel 4 and tube
`7 are all provided by an integral die-casr body
`of aluminium or zinc based alloy. The casting
`is open at the top above the tube 7 and the
`separator chamber3, the casting being closed
`to form the tube by a closure plate 21 provid-
`ing said upper wall in which the jet nozzle 9 is
`formed. The supply pipe 10 to the nozzle 9
`passes through the space 22 within the die-
`cast body above the plate 21 as well as
`through the chamber 19, andit is encapsu-
`lated within the space 22, for example with
`an epoxy resin. The exhaust pipe 15 is pro-
`vided by a further die-cast moulding whichfits
`into the body and has an intermediate annular
`flange 23 which seals against the body
`through a gasket 24 to form the top of the
`cyclone separating chamber3.
`The neck 5a of the container 5 has a top lip
`5 b engagedby twospring clips, which are
`respectively fixed to the sides of the body and
`act to retain the container. This provides a
`quick-release attachment for the container 5,
`and the rim of the container neck 5a seals
`against a foam rubber sealing ring housed in
`a recess between the skirt 2a and the funnel
`4. The frusto-conical funnel 4 has a short
`cyclindrical extension at its lower end with a
`lip 4b to retain an elastic band which can be
`used to secure a disposable polythene bag to
`the funnel in lieu of the container 5. This
`simplifies the disposal of contaminated
`material which can be thrown away with the
`bag.
`The valve 13 comprises a simple poppet
`valve member 26 which is directly displacea-
`ble off its seating in the block 11 (which is
`shownsectioned in Fig. 3) by the trigger
`member 14 which is pivoted to the block 11.
`The valve member 26 is urged to the closed
`position, as shown, by a valve spring 27 an
`abutmentfor which is provided by a closure
`plug 28 screwedinto the block 11. This plug
`seals off an aperture through which the valve
`member 26 and the spring 27 are fitted.
`To use the device the operator actuates the
`trigger member 14, thus starting the air flow
`along the tube 7 into the cyclone chamber3.
`Swarf or other solid matter to be collected can
`then be picked up by the suction at the nozzle
`8, and transported by the air stream along the
`tube 7 to the chamber3. In that chamber a
`normal centrifugal cyclone separation occurs,
`the solid matter which is separated out falling |
`down the funnel 4 into the container 5 which
`can be detached and emptied when full, or
`
`|
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`into a disposable polythene bag fixed to the.
`extension 4a whenpreferred. Theair dis-
`charges to atmosphere from the chamber 3
`through the pipe 15 and chamber 19.
`70 As shownthepistol grip is offset to said
`one side of the central section line I/-1] and in
`line with the tube 7 to improve balance, and
`as a modification (not shown) the air jet 9
`may be positioned on the vertical centre line
`75 of the tube 7. As a further modification (again
`not shown)the air jet may be provided by a
`drilling, which may be divergent, in a con-
`necting piece mounted at the end of the tube
`7 and on to which the interchangeable nozzles
`80 such as8 fit.
`At the sides of the device the closure plate
`18 has projecting angled lugs 29 (see Fig. 2).
`These enable the device to be hung up out of
`the way whennot in use. The closure plate
`1
`85 18 is shownin ghost broken outline in Fig.
`to show how the pipe 10 passes through the
`chamber 19 to the valve block 11. The plate
`18 is held in place by two screws at 30, and
`it retains a spring 31 which holds the flange
`90 23 in sealing engagement with the gasket 24.
`The bottom end inlet of the exhaust pipe 15
`is positioned at the bottom of the cyclone
`separator chamber 3, and the exhaustdis-
`charge path through the exhaust chamber 19
`95 prevents any possibility of non-separated sol-
`ids being exhausted to atmosphere. Any solids
`which may enter the pipe 15 will collect in
`the chamber 19. Removal of the plate 18
`enables the chamber 19 to be cleaned out,
`100 and also the moulding 15, 23 to be removed
`for cleaning of the device as a whole and
`should the chamber 3 become clogged with
`swarf.
`In the modification of Fig. 4 the air supply
`105 pipe 10 supplies an air distribution block 40,
`which in turn supplies a forwardly directed air
`biast nozzle 41 as well as the suction air jet
`nozzle 9. The interchangeable inlet suction
`nozzle 8 is cut. away to allow the nozzle 41 to
`110 project within the cross-sectional area of the
`suction nozzle 8. Fig. 4 illustrates how the
`modified device is used to remove swarf from
`a blind hole 42 in a component 43. The
`device is positioned so that when the trigger-
`115 operated ON/OFF valve is actuated the air
`blast from the nozzle 41 dislodges the swarf
`in the bore 42, the dislodged swarf then
`being picked up by the suction nozzle 8 and
`transported along the suction pipe 7 to the
`120 cyclone chamber3.
`The device as modified in Fig. 4 also has a
`top cover 44 which replaces the closure plate
`18 of Figs. 1 to 3 and is in the form of a light
`pressing. This pressing has an indentation
`125 44a to assist the air flow and for location of
`the spring 31. The exhaust pipe 15 projects
`only a short distance upwardly into the ex-
`haust chamber 19, terminating well below the
`top cover 44 so that slotting of the pipe 15 is
`130 not now necessary.
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`GB2035 787A 3
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`CLAIMS
`1. A hand-held suction cleaning device
`having a suction pipe leading to a cyclone
`separator which exhausts to atmosphere and
`is disposed above a container for solids which
`are in use picked up at an inlet end of the
`pipe and separated out in the separator, and
`an air inlet connection for coupling to a com-
`pressed air line and which supplies an airjet
`which discharges into the suction pipe to
`produce an air flow therealong to the separa-
`tor with resultant suction at the inlet end of
`the pipe.
`2. A device according to claim 1, wherein
`a detachable nozzle at the inlet end of the
`pipe provides the suction inlet.
`3. A device according to claim 2, wherein
`said nozzle is one of a range of interchangea-
`ble nozzles differently shaped to suit a variety
`of applications.
`4. A device according to claim 2 or 3,
`wherein said nozzle, or one of said range
`thereof, is of elongated rectangular cross-sec-
`tion as suited to clearing out the T-slots of a
`slide or table of a machine tool.
`5. A device according to any one of the
`preceding claims, wherein a discharge funnel
`below the separator discharges into the con-
`tainer.
`6. A device according to claim 5, wherein
`said funnel has an end section with a lip to
`retain an elastic band by means of which a
`disposable polythene bag can be secured to
`the funnel in place of the container.
`7. A device according to any oneof the
`preceding claims, wherein the device has a
`pistol-grip handle, an ON/OFF air vaive to
`control the air jet and a trigger control mem-
`ber for operation of the air valve.
`8. A device according to any oneof the
`preceding claims, wherein a pre-settable nee-
`dle valve is provided for adjustable throttling
`of the air flow to said. air jet.
`9. A device according to any one of the
`preceding claims, wherein said separator has
`an annular chamberinto which the suction
`pipe feeds tangentially and which exhausts to
`atmosphere through an exhaust pipe posi-
`tioned centrally of the chamber, said exhaust
`pipe having an inlet at the bottom of the
`separator chamberand an outlet above the
`chamber.
`10. A device according to claim 9,
`wherein said exhaust pipe outlet discharges
`into an exhaust chamber disposed above the
`separator chamber and whichin turn dis-
`charges to atmosphere away from an operator
`whenholding the device.
`11. A device according to claim 9 or 10,
`wherein the separator chamberis formed
`within a main body moulding to which the
`container is detachably secured, and the ex-
`haust pipe is provided by a removable mould-
`ing which includes an intermediate flange
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`which forms the top wall of the separator
`chamber.
`12. A device according to claim 11,
`wherein the removable moulding is held in
`70 position within the body moulding by a top
`closure plate which provides the top of said
`exhaust chamber and is detachable for clean-
`ing the exhaust chamber and removal of the
`exhaust pipe moulding.
`13. A device according to any one of the
`preceding claims, wherein said air jet issues
`from a nozzle in the wall of the suction pipe
`adjacent the inlet end thereof.
`14. A device according to any one of the
`80 preceding claims, wherein an air blast nozzle
`of the device is positioned to produce an air
`blast operative to dislodge material to be
`picked up at the inlet end of the suction pipe.
`15. A device according to claims 7 and
`85 14, wherein said ON/OFF valve supplies both
`the suction air jet and the air blast nozzle.
`16. A hand-held suction cleaning device
`constructed and arranged substantially as
`herein particularly described with reference to
`90 andasillustrated in Figs.
`1 to 3 of the
`accompanying drawings, or modified as
`shownin Fig. 4 of the accompanying draw-
`ings.
`
`Printed for Her Majesty’s Stationery Office
`by Burgess & Son (Abingdon) Ltd.—1980
`Published at The Patent Office, 25 Southampton Buildings,
`London, WC2A 1AY, from which copies may be obtained.
`
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