US3639936A - Self-propelled floor scrubber - Google Patents

Self-propelled floor scrubber Download PDF

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Publication number
US3639936A
US3639936A US44168A US3639936DA US3639936A US 3639936 A US3639936 A US 3639936A US 44168 A US44168 A US 44168A US 3639936D A US3639936D A US 3639936DA US 3639936 A US3639936 A US 3639936A
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US
United States
Prior art keywords
subframe
squeegee
supporting
tractor body
brush
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US44168A
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English (en)
Inventor
Walter G Ashton
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
STAR IND Inc
Original Assignee
STAR IND Inc
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Filing date
Publication date
Application filed by STAR IND Inc filed Critical STAR IND Inc
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Publication of US3639936A publication Critical patent/US3639936A/en
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    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L11/00—Machines for cleaning floors, carpets, furniture, walls, or wall coverings
    • A47L11/40—Parts or details of machines not provided for in groups A47L11/02 - A47L11/38, or not restricted to one of these groups, e.g. handles, arrangements of switches, skirts, buffers, levers
    • A47L11/4052—Movement of the tools or the like perpendicular to the cleaning surface
    • A47L11/4055—Movement of the tools or the like perpendicular to the cleaning surface for lifting the tools to a non-working position
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L11/00—Machines for cleaning floors, carpets, furniture, walls, or wall coverings
    • A47L11/02—Floor surfacing or polishing machines
    • A47L11/10—Floor surfacing or polishing machines motor-driven
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L11/00—Machines for cleaning floors, carpets, furniture, walls, or wall coverings
    • A47L11/40—Parts or details of machines not provided for in groups A47L11/02 - A47L11/38, or not restricted to one of these groups, e.g. handles, arrangements of switches, skirts, buffers, levers
    • A47L11/4052—Movement of the tools or the like perpendicular to the cleaning surface
    • A47L11/4058—Movement of the tools or the like perpendicular to the cleaning surface for adjusting the height of the tool
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01H—STREET CLEANING; CLEANING OF PERMANENT WAYS; CLEANING BEACHES; DISPERSING OR PREVENTING FOG IN GENERAL CLEANING STREET OR RAILWAY FURNITURE OR TUNNEL WALLS
    • E01H1/00—Removing undesirable matter from roads or like surfaces, with or without moistening of the surface
    • E01H1/02—Brushing apparatus, e.g. with auxiliary instruments for mechanically loosening dirt

Definitions

  • a self-propelled floor scrubber which includes a tractor unit having an internal combustion engine which operates an alternator as an electrical power source and a pump for pressurizing the hydraulic system which in turn operates the hydraulic brush-rotating motors as well as a hydraulic drive motor for propulsion of the tractor unit.
  • the rotating brush assembly provides three circular flat-tothe-floor brushes arranged in a triangular pattern, and is pivotally connected to the under frame of the tractor unit and operatively connected to a movable piston of a hydraulic cylinder which functions to pivotally raise and lower the brush assembly.
  • the squeegee assembly consists of a parallelogram arrangement which, through the operation of a hydraulic cylinder, is pivotally associated so as to raise and lower the squeegee elements into and out of floor-engaging position.
  • the hydraulic system also includes an automatic bypass conduit arrangement whereby when the tractor unit is propelled in a reverse direction, the squeegee assembly will be automatically raised so as to prevent damage thereto and to permit continuing the scrubbing operation of the rotating brushes in either forward or reverse direction.
  • FIG. 1 illustrates a self-propelled floor scrubber unit
  • FIG. 2 is a perspective view of the squeegee subassembly
  • FIG. 3 is a perspective view of the brush subassembly
  • FIG. 4 is a perspective side view of the brush subassembly
  • FIG. 5 is a fragmentary detailed sectional view of a shockabsorbing connection associated with the squeegee subassembly
  • FIG. 6 is a schematic flow chart of the hydraulic system employed in the floor scrubber unit.
  • the self-propelled floor-scrubbing unit includes a plurality of rotatable floor brushes positioned forwardly and beneath the main frame portion of the tractor unit.
  • the floor scrubber includes a squeegee assembly which positions a first squeegee forwardly of the rear driving wheels of the tractor unit, and a second squeegee to the rear thereof.
  • the brush-supporting assemblies comprise a substantially T-shaped subframe 10, with the leg portion thereof comprising two spaced-apart members 11 and 12 formed to converge at their free ends to support a hydraulic brush-rotating motor 13 for the forward scrubbing brush.
  • the opposite ends of the members 11 and 12 are fixedly connected to the crossbar 14 of the T-shaped subframe which in turn at its extremities supports additional hydraulic brushrotating motors l5 and 16.
  • a connector plate 17 Extending between the spaced members 11 and 12 of the T- shaped subframe is a connector plate 17, the ends of which are connected as at 18 to each of the spaced members 11 and 12.
  • a concaved cambered beam 20 Mounted on the connector plate 17 by a loose connection 19, is a concaved cambered beam 20.
  • the beam 20 is of a length greater than the connecting plate 17 so as to extend beyond the ends thereof as well as beyond the spaced members 11 and 12.
  • cambered beam 20 Fixedly connected to the cambered beam 20 are a pair of supporting bars 21 and 22 which at their free ends provide a right-angled portion 23 and 24 which in turn terminates into leg portions 25 and 26 extending substantially parallel to their respective supporting bars 21 and 22 and which in turn are pivotally connected as at 27 to the under frame of the tractor unit as seen in FIG. 1.
  • connecting rods 28 and 29 At the ends of the cambered beam 20 and extending vertically therefrom are a pair of connecting rods 28 and 29.
  • the connecting rod 28 is in turn connected to an Lshaped link 30 which at a point 31 is likewise pivotally connected to the under frame of the tractor unit.
  • One end of the L-shaped link 30 has connected thereto as at 32, the exposed end of a piston 33 of a hydraulic cylinder 33'.
  • the rod 29 has its free end connected to a pivot bar 34 which is pivotally connected at a point 35 to the under frame of the tractor unit.
  • the supporting rods 28 and 29 are journaled through a pair of spring members 36 which have one end bearing against the cambered beam 20 and their opposite ends restrained by a looped end 37. These spring members 36 act as a shock-absorbing connection between the entire brush-supporting T- shaped subframe and the tractor unit.
  • the member 11 Depending from the supporting bars 21 and 22 are guide fingers 38 which bear against the inside surfaces of the spaced members 11 and 12, guiding the movement thereof upwardly as the assembly is pivotally actuated.
  • the member 11 also carries a guide 39 and bumper 40 which prevents over pivotal movement of the T-frame relative to the supporting bars 21 and 22.
  • the squeegee assembly 41 comprises a pair of parallelogram structures each of which includes an upper fixed supporting bar 42 and a parallel squeegee-supporting bar 43, connected to the supporting bar 42 by parallel side bars 44 and 45.
  • Each of the supporting bars 42 is connected to the underframe of the tractor unit so as to be stationary with respect thereto.
  • the connection of the side bars 45 to the supporting bars 42 includes a shaft 46 upon which is freely journaled by a U-shaped bracket 47, a hydraulic cylinder 48 having a piston 49, the free end of which by a U- shaped bracket 50 is connected to a second shaft 51 which extends between and forms a part of the pivotal connection between the opposite ends of the side bars 44 and the support bars 43.
  • the squeegee-supporting bars 43 are comprised of two bar members 52 and 53, with the bar 52 terminating at its point of pivotal connection of the side bars 45 thereto, as shown in FIG. 2.
  • the bar 52 extends forwardly beyond its pivotal connection to the side bar 44 and supports the forward squeegee-carrying bar 52'.
  • the bar 53 extends rearwardly beyond its pivotal connection to the side bar 45 and supports the squeegee-carrying bar 53'.
  • the two bars 52 and 53 are connected to the lower end of the side bars 45 by a nut and bolt arrangement 54 which extends through an elongated slot 55 formed in the bar 53 and through a close tolerance opening 56 in the end of the bar 52.
  • the end of the bar 52 provides a perpendicular rod 57 which is freely journaled through a flange 58 provided by the bar 53.
  • the bar 53 Over the rod 57 is a coil spring 59 which is compressed against the flange 58 by a retaining nut and washer 60.
  • the bar 53 has a loose connection to the end of the bar 52 as well as to the end of the side bar 45. This loose connection permits a floating shock-absorbing connection of the rear squeegee to its support to accommodate any unevenness in the floor surface being treated by the floor scrubber.
  • adjusting rods 61 that extend between shafts 46 and 51.
  • These adjusting rods 61 comprise telescoping elements (not shown) that have their opposite ends joumaled onto the shafts 46 and 51.
  • One of the telescoping elements is threaded and carries adjusting nuts 62 which by threadable adjustment determine the overall length of the rods 61.
  • FIG. 6 there is schematically shown a hydraulic fiow chart utilized in the floor-scrubbing unit.
  • the system includes a hydraulic pump 63, an engine-cooled heat exchange 64, and a large oil reservoir 65.
  • a flow divider 66 directs the hydraulic fluid to the tractor drive valve and the control valves for the brush and squeegee assemblies. As shown, the fluid from the flow divider is by the conduit 67 passed into the tractor drive valve 68, which in its forward drive position is connected by conduit 69 to the hydraulic tractor drive motor 70.
  • a return conduit 71 is connected to the relief valve 72 and back to the lines of conduit that terminate at the reservoir 65.
  • the tractor drive valve 68 When the tractor drive valve 68 is actuated so as to drive the unit in a reverse direction, the tractor drive valve 68 is connected by conduit 73 to the reverse flow direction of the tractor drive motor 70. If, however, in the reverse direction the squeegee cylinder 48 through its control valve lever 74 is operated so that the squeegee assembly is in a down position, the hydraulic fluid flowing through the tractor drive valve 68 and conduit 73 is permitted to pass through conduit 75 and directional check valve 76 into the cylinder 48 so as to expel the piston 49 thereof, raising the squeegee assembly before the tractor drive motor 70 moves the unit in a reverse direction.
  • the squeegee valve lever 74 is operated so as to open the squeegee valve contained in the valve control unit 77, the hydraulic fluid passes through conduit 78, through the relief valve 72, and into the squeegee cylinder 48, retracting the piston 49 thereof, which in effect lowers the squeegee assembly into its floor-engaging operative position.
  • the brush assembly valve lever 79 When the brush assembly valve lever 79 is actuated so as to lower the brush assembly, it will also function to actuate the hydraulic brush motors 13, and 16. This is accomplished by having the hydraulic fluid introduced into conduit 80 which is in series connection to the three brush motors l3, l5 and 16, conduit 81 which introduces fluid into the brush assembly cylinder 82, retracting its piston so that the brush assembly unit is lowered onto the floor, through a brush pressure relief valve 83, conduit 84, and back to the reservoir 65. When the brush control valve lever 79 is moved so as to raise the brush assembly, the hydraulic fluid is caused to pass through conduit 85 and into the brush assembly cylinder 82, expelling the piston thereof and pivotally raising the brush assembly out of operative position.
  • a self-propelled floor-scrubbing machine including a tractor-type wheeled hydraulically driven body, carrying scrubbing brush and squeegee assemblies, wherein the improvement comprises:
  • a pivotal support for said subframe including a pair of elongated supporting arms having one end pivotally connected to the tractor body and their opposite ends connected to a concaved cambered crossbeam,
  • a hydraulically operated pivoting link pivotally connected to the tractor body at a point removed from and in substantial horizontal alignment with the pivotal connection of said supporting arms of said pivotal support to the tractor body and to said shock-absorbing connections for raising and lowering said brush-supporting subframe relative to the tractor body, hydraulic means for pivoting said link relative to its connection to the tractor body for pivoting said supporting arms relative to their connection to the tractor body for raising and lowering said brush-supporting frame,
  • a squeegee subframe connected to the tractor body between certain wheels thereof, said squeegee subframe including a pair of four-bar mechanisms pivotally joined together in the form of a parallelogram with certain of said bars of each mechanism fixedly connected to the underside of the tractor body and certain other of said bars supporting squeegee elements, and
  • hydraulic means for pivotally collapsing and extending the parallelogram formed by said mechanisms to raise and lower said squeegee elements relative to the tractor body.
  • the floor-scrubbing machine defined by claim 1 including a hydraulic system having manually operated valves for controlling the direction of operation of all of said hydraulic means so as to raise or lower said brush-supporting subframe and said squeegee subframe, said system including a directional hydraulic bypass relative to the control valve for said squeegee subframe adapted to operate said squeegee subframe hydraulic means in one direction so as to raise said squeegee subframe when the scrubbing machine is hydraulically driven in a reverse direction.
  • a self-propelled floor-scrubbing machine as defined by claim 3 including a hydraulic system having manually operated valves for controlling the direction of operation of all of said hydraulic means so as to raise or lower said brush-supporting subframe and said squeegee subframe, said system including a directional hydraulic bypass relative to the control valve for said squeegee subframe, adapted to operate said squeegee subframe hydraulic means in one direction so as to raise said squeegee subframe when the scrubbing machine is hydraulically driven in a reverse direction.
  • a self-propelled floor-scrubbing machine as defined by claim 5 including a hydraulic system having manually operated valves for controlling the direction of operation of all of said hydraulic means so as to raise or lower said brush-supporting subframe and said squeegee subframe, and said system including a directional hydraulic bypass relative to the control valve for said squeegee subframe adapted to operate said squeegee subframe hydraulic means in one direction so as to raise said squeegee subframe when the scrubbing machine is hydraulically driven in a reverse direction.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Cleaning In General (AREA)
  • Soil Working Implements (AREA)
  • Vehicle Cleaning, Maintenance, Repair, Refitting, And Outriggers (AREA)
US44168A 1970-06-08 1970-06-08 Self-propelled floor scrubber Expired - Lifetime US3639936A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US4416870A 1970-06-08 1970-06-08

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Publication Number Publication Date
US3639936A true US3639936A (en) 1972-02-08

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US44168A Expired - Lifetime US3639936A (en) 1970-06-08 1970-06-08 Self-propelled floor scrubber

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US (1) US3639936A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
DE (1) DE2034813A1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
FR (1) FR2094097B1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
GB (1) GB1322240A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
NL (1) NL145753B (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
NO (1) NO128472B (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
SE (1) SE364866B (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3787916A (en) * 1971-08-13 1974-01-29 Daihatsu Motor Co Ltd Floor surface cleaning and dressing apparatus
US4009500A (en) * 1976-04-26 1977-03-01 Star Industries, Inc. Floor scrubbing apparatus
US4058082A (en) * 1976-06-25 1977-11-15 A/S Jotungruppen Submersible painting apparatus
US4457036A (en) * 1982-09-10 1984-07-03 Tennant Company Debris collecting mechanism
US5485653A (en) * 1994-04-25 1996-01-23 Windsor Industries, Inc. Floor cleaning apparatus
US6256827B1 (en) * 1999-08-10 2001-07-10 Roger P. Vanderlinden Utility type surface cleaning vehicle having improved gutter broom placement
US20060000491A1 (en) * 2004-07-02 2006-01-05 Crocker James P Stripe removal system
US20090242003A1 (en) * 2008-02-28 2009-10-01 Crocker James P Water Blasting Head With Through Feeding Hydraulic Motor
US20090241999A1 (en) * 2008-02-28 2009-10-01 Crocker James P Modular Stripe Removal System
US20100200514A1 (en) * 2009-01-26 2010-08-12 Crocker James P Water Treatment System For Surface Cleaning Apparatus
USD654234S1 (en) 2010-12-08 2012-02-14 Karcher North America, Inc. Vacuum bag
US8887340B2 (en) 2003-05-14 2014-11-18 Kärcher North America, Inc. Floor cleaning apparatus
US8966693B2 (en) 2009-08-05 2015-03-03 Karcher N. America, Inc. Method and apparatus for extended use of cleaning fluid in a floor cleaning machine
US9015887B1 (en) 2003-05-14 2015-04-28 Kärcher North America, Inc. Floor treatment apparatus
US9908068B2 (en) 2012-02-14 2018-03-06 Waterblasting, Llc Water and debris recovery system
USD907868S1 (en) 2019-01-24 2021-01-12 Karcher North America, Inc. Floor cleaner
US12070181B2 (en) 2017-05-04 2024-08-27 Alfred Kärcher SE & Co. KG Floor cleaning appliance and method for cleaning a floor surface

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2657769B1 (fr) * 1990-02-07 1994-07-29 Miroir 2000 Sarl Machine automotrice de traitement de surface au moyen d'agents liquides et de brosses rotatives.
DE4101489A1 (de) * 1990-02-20 1991-08-22 Josef Nusser Reinigungsmaschine

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3376597A (en) * 1966-02-02 1968-04-09 Boyd Clarence Floor scrubbing machine

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3436788A (en) * 1967-07-27 1969-04-08 Wayne Manufacturing Co Streetsweeper vacuum pickup head assembly

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3376597A (en) * 1966-02-02 1968-04-09 Boyd Clarence Floor scrubbing machine

Cited By (31)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3787916A (en) * 1971-08-13 1974-01-29 Daihatsu Motor Co Ltd Floor surface cleaning and dressing apparatus
US4009500A (en) * 1976-04-26 1977-03-01 Star Industries, Inc. Floor scrubbing apparatus
US4058082A (en) * 1976-06-25 1977-11-15 A/S Jotungruppen Submersible painting apparatus
US4457036A (en) * 1982-09-10 1984-07-03 Tennant Company Debris collecting mechanism
US5485653A (en) * 1994-04-25 1996-01-23 Windsor Industries, Inc. Floor cleaning apparatus
US5555596A (en) * 1994-04-25 1996-09-17 Windsor Industries, Inc. Floor cleaning apparatus
US5630246A (en) * 1994-04-25 1997-05-20 Windsor Industries, Inc. Floor cleaning apparatus with flap having wear indicator
US6256827B1 (en) * 1999-08-10 2001-07-10 Roger P. Vanderlinden Utility type surface cleaning vehicle having improved gutter broom placement
US9192276B2 (en) 2003-05-14 2015-11-24 Karcher North America, Inc. Floor cleaning apparatus
US9730566B2 (en) 2003-05-14 2017-08-15 Kärcher North America, Inc. Floor treatment apparatus
US10555657B2 (en) 2003-05-14 2020-02-11 Kärcher North America, Inc. Floor treatment apparatus
US9757005B2 (en) 2003-05-14 2017-09-12 Kärcher North America, Inc. Floor treatment apparatus
US9510721B2 (en) 2003-05-14 2016-12-06 Karcher North America, Inc. Floor cleaning apparatus
US9451861B2 (en) 2003-05-14 2016-09-27 Kärcher North America, Inc. Floor treatment apparatus
US9015887B1 (en) 2003-05-14 2015-04-28 Kärcher North America, Inc. Floor treatment apparatus
US8887340B2 (en) 2003-05-14 2014-11-18 Kärcher North America, Inc. Floor cleaning apparatus
US20080066781A1 (en) * 2004-07-02 2008-03-20 Crocker James P Stripe removal system
US7255116B2 (en) * 2004-07-02 2007-08-14 Crocker James P Stripe removal system
US20060000491A1 (en) * 2004-07-02 2006-01-05 Crocker James P Stripe removal system
US8357245B2 (en) 2004-07-02 2013-01-22 Crocker James P Stripe removal system
US20090241999A1 (en) * 2008-02-28 2009-10-01 Crocker James P Modular Stripe Removal System
US20090242003A1 (en) * 2008-02-28 2009-10-01 Crocker James P Water Blasting Head With Through Feeding Hydraulic Motor
US9180496B2 (en) 2008-02-28 2015-11-10 Waterblasting, Llc Water blasting head with through feeding hydraulic motor
US20100200514A1 (en) * 2009-01-26 2010-08-12 Crocker James P Water Treatment System For Surface Cleaning Apparatus
US8357292B2 (en) 2009-01-26 2013-01-22 Crocker James P Water treatment system for surface cleaning apparatus
US8966693B2 (en) 2009-08-05 2015-03-03 Karcher N. America, Inc. Method and apparatus for extended use of cleaning fluid in a floor cleaning machine
USD654234S1 (en) 2010-12-08 2012-02-14 Karcher North America, Inc. Vacuum bag
US9908068B2 (en) 2012-02-14 2018-03-06 Waterblasting, Llc Water and debris recovery system
US10265648B2 (en) 2012-02-14 2019-04-23 Waterblasting, Llc Water and debris recovery system
US12070181B2 (en) 2017-05-04 2024-08-27 Alfred Kärcher SE & Co. KG Floor cleaning appliance and method for cleaning a floor surface
USD907868S1 (en) 2019-01-24 2021-01-12 Karcher North America, Inc. Floor cleaner

Also Published As

Publication number Publication date
DE2034813A1 (de) 1971-12-16
NL7010151A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1971-12-10
NL145753B (nl) 1975-05-15
NO128472B (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1973-11-26
FR2094097A1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1972-02-04
SE364866B (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1974-03-11
FR2094097B1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1974-09-20
GB1322240A (en) 1973-07-04

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