US1048477A - Dust-collecting system. - Google Patents

Dust-collecting system. Download PDF

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US1048477A
US1048477A US1906322820A US1048477A US 1048477 A US1048477 A US 1048477A US 1906322820 A US1906322820 A US 1906322820A US 1048477 A US1048477 A US 1048477A
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valve
fan
leads
communication
lead
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William E Allington
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William E Allington
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65GTRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G51/00Conveying articles through pipes or tubes by fluid flow or pressure; Conveying articles over a flat surface, e.g. the base of a trough, by jets located in the surface
    • B65G51/02Directly conveying the articles, e.g. slips, sheets, stockings, containers or workpieces, by flowing gases
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10STECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S55/00Gas separation
    • Y10S55/18Work bench
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00Fluid handling
    • Y10T137/8593Systems
    • Y10T137/86493Multi-way valve unit
    • Y10T137/86815Multiple inlet with single outlet

Description

W. E. ALLINGT() N.

DUST COLLECTING SYSTEM.

APPLICATION FILED JUNE z2, 190s.

1,048,477., Patented Dec.3"1, 1912.

3 SHEETS-SHEET 1.

QM i @Q W. E. ALLINGTON.

DUST COLLECTING SYSTEM.

APPLICATION FILED 111111122, 190s.

1,048,477. Patented 11811.31, 1912.

3 SHEETS-SHEET 2.

W. E. ALLINGTON.

DUST COLLECTING SYSTEM.

APPLloATIoN YILBD JUNI; 22, 190s.

Patented Dec. 31, 1912.

3 SHEETS-SHEET 3 U7@ WM@ L UNITED STATES PATENT oFFIoE.

WILLIAM E. ALLING'roN, oFsAoINAw, MICHIGAN;

Specification of :'Letters Patent.

Patented, Dec. 31, 19.1.2.t

Application led June 22, '1906. Serial No. 322,820.

To all whom 'it may concer/n.:

as are used for example in keeping clean grain elevators and the like. t Heretofore it has been the practice 1n grain elevators to install a system for the collection of dust arising from the handling of ain, comprising-a number of leads ofl ipmg extending to differentareas of the uilding to be cleaned, (for instance to the different floors and galleries of the building,) to effect communication between such leads and a large trunk, of sufiicientcapacit-y as to handle the air ands material from substantially all of the different leads, and to install a fan and dust-collector of suitable capacity to handle the maximum quantity of air and material which may be supplied through the trunk. Such systems have been found in practice to be open to nu'nerous objections, the most obvious of which is the great size of the fan necessarily used andv the large expenditure of power or force necessary to drive the fan. It is true in such a dust collecting installation, that while all of the leads are necessary to secure l proper cleaning of the premises, the maximum load imposed upon the system under any normal condition is greatly less than the fan-capacity necessarily provided for such system, so that such a system is operated with greatI waste of power and lack of economy. Further I have found that such systems readily become clogged and useless, in greater or less degree, for there being open communication between all of the leads and the main trunk at all times,

' if any one lead starts to clog, the freer air supply from other leads causes thc fan to draw harder from such free leads, and thereby reduce the exhausting effect in the choked lead where it is most needed, so that theclogging becomes aggravated until it results in a practical disabling of that branch of the system, and in course of time the whole system is deleteriously adected so that the piping must be manually cleaned.

insurin One of the salient objects of my invention 1s to provide a system wherein the Vef- .fective work of cleaning an elevator or like plant may be accomplished by an installation involving a fan of much less capacity for any given size of plant than in the old system, and to provide means for a the operative association of the fan w1t only such lead as may be in practilcal operation at any given time, so that the full efficiency of the fan may be employed 1n the transportation of air and material through .the operating lead, thereby mini mlzing the chance of choking any one of the leads.

Another object of m invention is to provide simple means w ich may be readily operated from any part of the structure,

Yfor controlling the communication of the several leads with the fan, and to so arrange 'said devices that while, under normal conditions, communication is constantly afforded between the fan and that leadl wherevin activity is most nearly constant, such'communication may be interrupted and commun1cat1on effected between the fan and some other lead.

taken in conjunction'with the accompany' ing drawings, wherein:

Figure l is a diagrammatic elevation of a system embodying my invention, shown as applied to a grain elevator. Fig. 2 is a de- .tail View of the controlling cable connection with a movable trunk. Fig. 3 is a plan view, and, Fig. 4 a side elevation, each with parts broken away, of a preferred means for controlling communication between the fan and the piping leads. Fig. 5 is a detail in front elevation of the lock shown in Figs. 3 and 4, Figs. 6 and 7 are enlarged details of valves shown in Fig. l, and, Fig. 8 is an elevation with parts in section, of a modified embodiment of a part of my invention.

Throughout the drawings like numerals of reference refer always to like parts.

In Fig. l, I have illustrated the application of my invention to a grain elevatorr building, which comprises, as is usual in grain elevators, a machinery floor, a garner floor, a storage floor, and a distribution floor in the cupola of the building, a belt gallery, leading to the storage house, and the first i'loor, to and below which extend the ele Yended receptacles directly connected with the branch pipes 11, and lying at the Hoor level, so that dust may be swept from the floor, in cleaning, into the normally open mouthsof the sweeps, to be drawn in by the air current flowing-through the pipe and conveyed through the dust collection system. Of course the suction main 10 is,

of proper capacity yto handle the supply7 from all of the branches 11 thereon.

One or more leads 13, 13, 13b, are. provided, it being my preference to provide oneriser 13b for all of the suction mains 10 of the cupola, said riser being preferably of substantially the area or capacity of each of the suction mains 10; another lead, 13a connecting with the belt gallery, and a third lead 13 arranged to connect with the suc- `tion main 10 for the first floor, each of the last named leads being of substantially the same capacity as its suction main 10.

Other arrangements in detail may bviously be made to suit conditions of use, it being the general plan of my installation, however, to have each lead, or riser, only of suiicient capacity to take oii' t-he air supply from the one suction main 10, a lead being provided from each area so located, or arbitrarily divided, that in cleaning it will be treated as a unit.

Where, as in the cupola, more than one suction main 10 communicates with the riser, I arrange the uppermost main for open' communication with the riser and provide at the juncture -of each of the lower mains with the riser a suitable valve 14. As best illustrated in detail in Fig. 7, such a valve preferably comprises a valve proper 15, a weighted stem 16, normally holding the valve in position to close the distribution pipe from communication with the y riser, and movable to throw the valve to position, as shown in dotted lines in Fig. 7,

` to open the particular distribution pipe to the riser and cut 0E communication ofthe riser with the distribution pipe' normally opening thereto.

For convenience a cable 17, at one end attached to the operating lever 16, of the valve, may be run over a pulley 18 and arranged to be suitably secured, as by attachment to a hook 19, in position to hold, the valve to dotted line position shown in Fig. 7.

Fromv the rst floor branch pipes, piping connection is usually made as at 20, from each branch pipe 11, to an elevator boot, a

Vvalve 2l, as best shown in Fig. 6, being preferably provided to normally maintain open communication between the pipe 10' and the ipe 20, communicating with ythe elevator oot. The valve structure, 'shown in detail in Fig. 6, comprising preferably a valve proper 22, the lweighted handle 23,

an operating cord 24, whereby the valve may readilyvbe thrown to open position to cut 0H communication of the pipe 20 with the 'pipe 11, and open communication through said branch pi e 1l with the floor sweeps 12, on the first oor.

For the piping installation described I provide a fan suitably proportioned in 'capacity for any one of the leads or risers, and provide a valve arrangement by which said'fan is maintained normally in com-:f munlcation with the lead 13, so that ventifjmi lation is normally aorded for the elevator boots, and I further so provide the valve arrangement that it may be varied to effect communication between the fan and either of the leads 13a,13", but at the same time will interrupt the communication between the lead 13 and the fan. The preferred ar rangement for accomplishing this result is shown`in Figs. l to 5, wherein 25 indicates the fan, having its inlet connected, as by a trunk section 26, preferably of substantially the same capacity or sectional area as any one of the leads 13, 13a and13b,-with a grain trap 27, of construction to be hereafter more fully described. The Aintake of the t-rap is provided as at 28, with a socket member of a flexible piping connection, into which takes thejoint portion 29, of a trunksection valve-member 30, secured to a pivot 31, for lateral motion therewith, and adapted to be laterally moved by a lever 32, secured to said pivotpinrat its outer extremity the valve member 30 is operatively associated with an arc 33, into which debou'ch the mouths of the leads 13` 13a, 13", so that by movement to three lateral positions the valve 32 may be made to effect communication between any one of said leads, and the grain-trap and fan. A weight 34, se# cured to arcable 35, passing over a pulley 36, and connected with the free end of the valve, normally maintains the -valve in such position as to communicate with the lead 13, but for moving said' valve to either of its alternative positions, I provide a cable` Aso 'and the outlet trunk 26.

2:77 having branches 38 and 39 extending over suitable pulleys 40, for control respectively from the belt gallery and the various Hoors of the cupola.

It will be seen that either cable 39 or 38 may be pulled to swing the valve member laterally around to position to communicate with either of the leads 13a or 13". I also provide means for locking the valve in either of its adjusted positions, such means, for illustration, comprising a locking lever 41, provided' with a transverse arm 42, notched as at 43 for engagement with the operating lever 32 of the valve, and pivoted as at 44, upon 'a rod Whereon is mounted a do-uble grooved pulleyr wheel 45, over which take cables 46 and 47, extending to the diii'erent areas of the building where control is desirable, as over pulleys 48, the locking lever being preferably counterbalanced as at 49, and the parts being so relatively arranged that from any area of the building, where it may be desired, one of' the cables 46 or 47 may be operated, first to act through pulley 45 to lift the member 42 of the locking mechanism, thereby freeing the valve-operating lever 32, for movement to position the valve in any one of its alternative positions, and then to restore said lock to pcsition shown in Fig. 4, to cause engagement of its appropriate notch 43 with the valve operating lever, to hold it in its adjusted position against the pull' of the weight 34.

It will be understood that other locking 4.devices and operating devices might readily be substituted for those herein shown, but it will be understood that the essential features of my invention may be embodied even in the simple apparatus illustrated. The outlet of the fan 25 opens into a discharge pipe 50, preferably of only slightly greater capacity than any one of t-he leads 13, 13a or 13b and with the discharge pipe is connected a dust collector 5l, of any desired type. The grain trap, generally illustrated at 27, comprises vertical sides 52, and end walls 52', one of which is preferably inclined to narrow the lower or pocket portion of the trap, below the inlet trunk 28,

In the upper portion of the trap. in the area of most direct communication between the inlet 28 and the t outlet 26, I provide on each side a series of delectors 53, each tapering from its top to its bottom, and hinged as at 54, to the side wall of the casing. For each deflector an adjusting rod 55 is provided, passing through a suitable aperture in the side of the casing.

The operation of my improved system is as follows: Under normal conditions the valve 30, standing in theuposition shown in Fig. 3, effects communication between the fan and the lead communicating. w1th the first floor suction main and elevator boots, and the valve 2l stands in position to open communication of the elevator boots with the main.

Thus the fan normally draws air from the elevator boots through the pipes 20, 13 and valve 30 in the grain trap, and discharges the dust-laden air free from grain, through the delivery ipe 50 to the dust collector ,51. It will e understood that the fan and delivery pipe are properly j proportioned for this service, but are not of size large enough to handle the material and air from all of the main leads at once. If now it is desired to clean up the first floor, the floor is swept and the material gathered in piles in front of the sweeps 12, the valves 21 of the various branch pipes moved to position to close communication of pipes 20 with the pipe 11 and open communication between thesweeps 12 and the upper parts of the pipes 11, so that the air, after entering at the sweeps, passes the grain trap 27 and the fan 25, and is delivered through the delivery pipe 50 to dust collector 51 for the separation of the dust and free delivery of the air in the usual manner. i

In cleaning up tb'e building it is customary to have a cleaning crew who go through the building systematically, proceeding from Hoor to floor, so that it is unnecessary to have suction applied to the pipe 10 of more tbanone floor at a time. Now assuming that the cupola is to be cleaned, the crew, starting with the floor desired to berfirst cleaned, say the top floor, operate the cable 46 to raise thelocking-member 41, releasing the lever 32 for operation, then operate the cable 39 to cause the lever 32 to throw the valve member -30 into communication with the lead 13b, andrelease the lock-controlling rope 46 to permit the lock to return to position, so that its appropriate notch 43, engages the lever 32, and holds the valve in its adjusted position. Now suction is created through the leads 13b and the. upper, normally-open suction main 10, to the sweeps 12 on the machinery floor of the cupola, and after said machinery floor is cleaned the crew may proceed downward through the' several floors below, at each floor to be cleaned ,throwing the valve 14 to open communication between the suction pipe for that floor and the risers 13b, and at the same time to close off the normally-open lead to the upper floor. All the floors of the cupo-1a having been cleaned the locking device is released and the valve allowed to automatically return to normal position. lVhen the belt gallery is to be cleaned the same operation follows, save that the operating cable 38 is moved only to draw the valve 30 to mid position to communicate-with the lead 131. It will be understood that during the large portion of the timev when the building is not being cleaned the system stands always in normal condition, so that the fan acts to ventilate the elevator boots.

It will thus .be seen that when the dust from cleaning is not being handled the fan acts to draw air through one lead only, and that during the cleaning operation each of the various leads, extending to the different areas of the buildi'ngis in turn connected for communication with the fan, so that the action of the fanl is at lall times localized to create suction to some one lead, thereby pre venting the clogging heretofore referred to as of common occurrence inthe old style system, and enabling the installation of a relativelyfsmall fan, small trunking and delivery piping and small dust collectors.

In Fig. 8 the modified valve arrangement, as shown, provides a trunk 128, which opens to the grain trap in the usual manner, ,and the leads 113, 113a and 113b, corresponding with the leads 13, 13a and 13b in the other views. Eachof these leads is provided with a separate valve for opening or closing the communication with the trunk 128, and said trunk is properly proportioned for handling the air and material from only one lead at a time. I preferably provide in connection with the separate valves 114, 114a and 114b, of the several leads, means for insuring the closure of the normally-open lead 113, whenever either of the leads 1133, or 113b is opened by manipulation of its valve, and conversely for automatically opening communication between the .lead 113 and the trunk, when both the leads 113a and 113b are closed by their valves. To this end the several valves are connected by a series of cables to secure the desired results, in the embodiment shown each of thevalves indicated by the numeral 114 with or without exponents, being provided with a correspondingly distinguished operating lever 115, to which is connected an operating cord 116.

Pulleys 117, 117EL and 117" are provided with the several cords respectively, and, as an example, the desired result may be accomplished by lconnecting with the cord 116EL a cable 118, extending over pulleys 119 and 120, kfor connection with the cord 117a and also a cable 121 extending over pulley 122, for connection with cord 1161. Thus as either of the cords 116a or 116b is operated to open its corresponding valve 11421 or 114), the

. lever 115 or valve 114 is raised to cut oil' communication between the normally-open llead 113 and the trunk 128, andV conversely when the operating cord last operated lis released, to permit the restoration of valve 114a or 114b to normal closed position, the valve 114 is swung by its weight to normal wen or open position. Such a construction' lacks some of the advantages of the preferred form of construction, but it 'wilL obviouslyr operate in 'a measure to secure the benefit iny cident to the installation of myl improved system. The ain trap shown also acts with great eiciency -to prevent heavy dust from being deposited with the grain. The grain in transit through the trap dropsA in a curve into the pocket-and tends to carry with it heavy dust particles, but the deliectors 53, laterally restricting the direct air path froml inlet to outlet, force the air to sweep downward through the grain path, thereby freeing the grain from dust as it is 4falling into same conventionally, it will be understood ,I

that I do not limit my invention lto the spe ciiic construction of devices herein shown and described further t-han as specified in the claims, as it will be obvious that in the practice of the invention the details incident to the installation will vary widely to suit the requirements of the particular buildings through the exercise of mere mechanical skill.

Having thus described my invention, what I claim and desire to secure by Letters Pat,- ent, of the United States, is:

1. In a system of the character described, a fan, a plurality of leads, extending to different areas, means for eliecting communication between the fan and any selected lead, operating means therefor extending to and operable from any area to ellect communication between the lead from said area and the fan, a locking device for said valve, and

imeans operable from any areafor releasing said locking device. Y

2. In a system of the character described, a fan, leads extending to diiferent areas, each adapted to supply the fan to its normal ca* pacity, means for effecting communication between the fan and any selected lead, operating means therefor extending. to and op- .'erable from any area to effect communication between the lead for said area and the fan, a locking device operable from any area to maintain the valve in adjusted position, and means for automatically restoring the valve to connection with a predetermined lead whenever said locking means is released.

In testimony whereof I hereunto set my Y hand in the presence of two witnesses.

WILLIAM E. ALLINGTON.

In the presence of- GEO. T. MAY, J r.,

MARY F. ALLEN.

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Cited By (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2648295A (en) * 1950-07-29 1953-08-11 Nat Equip Corp Confectionery machine
US2675273A (en) * 1950-10-27 1954-04-13 Genevieve A Sanders Room vacuum cleaning system with baseboard ducts
US3129573A (en) * 1961-06-21 1964-04-21 Morpul Res Corp Hosiery delivery apparatus and method
US3131974A (en) * 1961-05-03 1964-05-05 Rudolph E Futer Air-lift conveying of solid objects
US3412531A (en) * 1966-03-15 1968-11-26 Schwab Louis Cleaning the air of circulating air systems
US3486309A (en) * 1965-11-17 1969-12-30 Parks Cramer Ltd Fiber waste disposal system for textile machines
US3490813A (en) * 1966-07-29 1970-01-20 Centralsug Ab Conveyance of material requiring hygienic disposal
US3546852A (en) * 1968-03-08 1970-12-15 Ltg Lufttechnische Gmbh Continuously operating filtering arrangement
US3627584A (en) * 1969-06-10 1971-12-14 Parks Cramer Ltd Method for pneumatically cleaning open-end spinning machines
US4285617A (en) * 1979-12-26 1981-08-25 Mark Gozion Duct and flop-gate construction and method of handling dust or other particulate material
US4753665A (en) * 1985-08-23 1988-06-28 James Fahey Method and apparatus for controlling the suction pressure in a dust collecting duct
US4784755A (en) * 1986-06-10 1988-11-15 Allied Millwrights, Inc. Dust control
US4787298A (en) * 1987-09-22 1988-11-29 Mobil Oil Corporation Method and apparatus to consolidate room and point exhaust with a single fan
US4947509A (en) * 1988-03-29 1990-08-14 Zinser Textilmashinen Gmbh Suction distribution apparatus for a spinning machine
US4977638A (en) * 1989-09-05 1990-12-18 Best Albert M Dust collection apparatus
US5012546A (en) * 1989-07-12 1991-05-07 Luwa Japan Limited Loom cleaning apparatus
US5499945A (en) * 1994-12-01 1996-03-19 Ferlin; Keith A. Ventilation apparatus providing air extraction adjacent selected workstations in a confined space
US5606767A (en) * 1995-05-19 1997-03-04 Crlenjak; Jack Vacuum operated dust and debris removal and collection system
US5893194A (en) * 1995-06-28 1999-04-13 Karmel; Israel Vacuum system
US6012199A (en) * 1998-01-07 2000-01-11 Litomisky; Petr Refuse vacuum system for machine shops
US6109837A (en) * 1995-06-01 2000-08-29 Snef Cote D'azur (S.A.) Pneumatic conveyor for small metallic pieces, particularly coins, for payment points
US6434784B1 (en) * 2000-12-19 2002-08-20 David A. Wisser Portable dust collection system for collection of wood floor sanding dust
US20040093682A1 (en) * 2002-11-19 2004-05-20 Ivan Litomisky Energy saving vacuum system for particle, mist, and fume collection
US7104734B2 (en) * 2001-04-16 2006-09-12 Hp Products, Inc. One-way pneumatic delivery system
US20090032126A1 (en) * 2007-07-06 2009-02-05 Kissel Jr Waldemar F Pneumatic System for Residential Use

Cited By (30)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2648295A (en) * 1950-07-29 1953-08-11 Nat Equip Corp Confectionery machine
US2675273A (en) * 1950-10-27 1954-04-13 Genevieve A Sanders Room vacuum cleaning system with baseboard ducts
US3131974A (en) * 1961-05-03 1964-05-05 Rudolph E Futer Air-lift conveying of solid objects
US3129573A (en) * 1961-06-21 1964-04-21 Morpul Res Corp Hosiery delivery apparatus and method
US3486309A (en) * 1965-11-17 1969-12-30 Parks Cramer Ltd Fiber waste disposal system for textile machines
US3412531A (en) * 1966-03-15 1968-11-26 Schwab Louis Cleaning the air of circulating air systems
US3490813A (en) * 1966-07-29 1970-01-20 Centralsug Ab Conveyance of material requiring hygienic disposal
US3546852A (en) * 1968-03-08 1970-12-15 Ltg Lufttechnische Gmbh Continuously operating filtering arrangement
US3627584A (en) * 1969-06-10 1971-12-14 Parks Cramer Ltd Method for pneumatically cleaning open-end spinning machines
US4285617A (en) * 1979-12-26 1981-08-25 Mark Gozion Duct and flop-gate construction and method of handling dust or other particulate material
US4753665A (en) * 1985-08-23 1988-06-28 James Fahey Method and apparatus for controlling the suction pressure in a dust collecting duct
US4820317A (en) * 1985-08-23 1989-04-11 James Fahey Method and apparatus for controlling the suction pressure in a dust collecting duct
US4784755A (en) * 1986-06-10 1988-11-15 Allied Millwrights, Inc. Dust control
US4787298A (en) * 1987-09-22 1988-11-29 Mobil Oil Corporation Method and apparatus to consolidate room and point exhaust with a single fan
US4947509A (en) * 1988-03-29 1990-08-14 Zinser Textilmashinen Gmbh Suction distribution apparatus for a spinning machine
US5012546A (en) * 1989-07-12 1991-05-07 Luwa Japan Limited Loom cleaning apparatus
US4977638A (en) * 1989-09-05 1990-12-18 Best Albert M Dust collection apparatus
US5499945A (en) * 1994-12-01 1996-03-19 Ferlin; Keith A. Ventilation apparatus providing air extraction adjacent selected workstations in a confined space
US5606767A (en) * 1995-05-19 1997-03-04 Crlenjak; Jack Vacuum operated dust and debris removal and collection system
US6109837A (en) * 1995-06-01 2000-08-29 Snef Cote D'azur (S.A.) Pneumatic conveyor for small metallic pieces, particularly coins, for payment points
US5893194A (en) * 1995-06-28 1999-04-13 Karmel; Israel Vacuum system
US6012199A (en) * 1998-01-07 2000-01-11 Litomisky; Petr Refuse vacuum system for machine shops
WO2000047100A1 (en) * 1998-01-07 2000-08-17 Petr Litomisky Refuse vacuum system for machine shops
US6434784B1 (en) * 2000-12-19 2002-08-20 David A. Wisser Portable dust collection system for collection of wood floor sanding dust
US7104734B2 (en) * 2001-04-16 2006-09-12 Hp Products, Inc. One-way pneumatic delivery system
US20040093682A1 (en) * 2002-11-19 2004-05-20 Ivan Litomisky Energy saving vacuum system for particle, mist, and fume collection
US7146677B2 (en) * 2002-11-19 2006-12-12 Ivan Litomisky Energy saving vacuum system for particle, mist, and fume collection
US20090032126A1 (en) * 2007-07-06 2009-02-05 Kissel Jr Waldemar F Pneumatic System for Residential Use
US8245724B2 (en) * 2007-07-06 2012-08-21 Wfk & Associates, Llc Pneumatic system for residential use
US8689820B2 (en) 2007-07-06 2014-04-08 Wfk & Associates, Llc Pneumatic system for residential use

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