US3276542A - Self-propelled scaffold - Google Patents

Self-propelled scaffold Download PDF

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Publication number
US3276542A
US3276542A US465917A US46591765A US3276542A US 3276542 A US3276542 A US 3276542A US 465917 A US465917 A US 465917A US 46591765 A US46591765 A US 46591765A US 3276542 A US3276542 A US 3276542A
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US
United States
Prior art keywords
frame
scaffold
wheels
platform
steering column
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
US465917A
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English (en)
Inventor
Pommier Pierre
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.)
Macc Manufacture D Armes & Cyc
Macc Manufacture D'armes & Cycles De Chatellerault
Original Assignee
Macc Manufacture D Armes & Cyc
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Macc Manufacture D Armes & Cyc filed Critical Macc Manufacture D Armes & Cyc
Application granted granted Critical
Publication of US3276542A publication Critical patent/US3276542A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G1/00—Scaffolds primarily resting on the ground
    • E04G1/24—Scaffolds primarily resting on the ground comprising essentially special base constructions; comprising essentially special ground-engaging parts, e.g. inclined struts, wheels
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G1/00—Scaffolds primarily resting on the ground
    • E04G1/34—Scaffold constructions able to be folded in prismatic or flat parts or able to be turned down
    • E—FIXED CONSTRUCTIONS
    • E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
    • E06C—LADDERS
    • E06C7/00—Component parts, supporting parts, or accessories
    • E06C7/16—Platforms on, or for use on, ladders, e.g. liftable or lowerable platforms
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G1/00—Scaffolds primarily resting on the ground
    • E04G1/24—Scaffolds primarily resting on the ground comprising essentially special base constructions; comprising essentially special ground-engaging parts, e.g. inclined struts, wheels
    • E04G2001/242—Scaffolds movable on wheels or tracks
    • E04G2001/244—Scaffolds movable on wheels or tracks mechanically operated
    • E04G2001/246—Scaffolds movable on wheels or tracks mechanically operated human powered

Definitions

  • This invention relates to scaffolds for supporting a workman in an elevated position, and particularly to a scaffold which can be moved on the ground or another supporting surface by the workman while he is supported on the platform, such a scaffold being referred to herein as a self-propelled scaffold.
  • the scaffolds with which this invention is more particularly concerned are useful in the field of building construction where they may support workmen painting a ceiling or doing other work above the floor which requires displacement of the workers in a horizontal direction. Ladders and similar devices cannot safely be moved while supporting a person, and ordinary wheeled platforms require the services of a helper if the work is not to be interrupted for a relatively long period for each displacement of the platform.
  • the utility of the scaffolds of the invention is not limited to construction work, and they are used to good advantage in aircraft maintenance work.
  • the basic object of the invention is the provision of a platform that may be held at any desired height within a practical range, which is stable and permits a workman standing on the platform to move freely without danger of toppling the platform and its supporting framework, and which may be moved by the workman along the ground or other supporting surface without descending from the platform.
  • the scaffold of the invention therefore includes a platform which is supported in a normally horizontal position on a normally upright framework.
  • Two rear wheels are rotatably mounted on the framework which also carries a steering column angularly movable about a normally upright axis and capable of axial translatory movement on the framework.
  • Two front wheels are mounted on the column, and the several wheels are arranged for rotation in normally upright planes.
  • Handles accessible from the platform permit the steering column to be moved angularly about its axis, and an automatic brake is respectively associated with each front wheel selectively to arrest rotation of the associated front wheel in one direction.
  • the framework also carries two front legs and is equipped with a shifting device which permits the front legs and front wheels to be shifted between two positions.
  • the shifting device includes a linkage which operatively connects the front legs and front wheels, is movably mounted on the framework, and is accessible from the platform.
  • FIG. 1 shows a self-propelled scaffold of the invention in a perspective view, most elements of the scaffold being in their normal operative position;
  • FIG. 2 shows a shifting linkage of the scaffold of FIG. 1 and associated elements in a side-elevational sectional view on a larger scale
  • FIG. 3 shows a front wheel of the scaffold and a portion of the front axle in side elevation and partly in section on the scale of FIG. 2;
  • FIG. 4 shows the scaffold in the collapsed condition ready for transportation or storage, the view corresponding to that of FIG. 1.
  • the scaffold of the invention has a normally upright front frame 1 of elongated rectangular shape.
  • Each longitudinal upright frame member has a cylindrical tubular top portion 2 in which a lower portion 3 is slidably received.
  • the two portions are adjustably secured to each other by a locking pin 4 which passes through two diametrically opposite openings in the top portion 2 and through one of several corresponding, longitudinally spaced openings (not shown) in the lower portions 3.
  • Two fixed legs 5 extend downward from the lower transverse frame member 6 which connects the two lower portions 3.
  • Each longitudinal member of a rear frame 7 is attached to the upper transverse member 8 of the front frame by two pivots 10.
  • Each longitudinal member of the rear frame consists of an upper portion 11 and a lower portion 12 which are also secured in telescoping engagement by a locking pin 4.
  • the lower portions 12 are connected by a tubular transverse member 13 in which two axles 14 are slidably mounted.
  • Each axle carries a rear wheel 15, and may be fixed in the member 13 by a clamping screw 18.
  • Two transverse frame members 16, 17 fixedly connect the top portions 2 of the front frame 1 and the upper portions 11 of the rear frame 7 respectively on a common horizontal level below the pivots 10.
  • the front edge of a platform 19 is attached to the transverse member 16 by strong hinges 20 (FIG. 2). Hooks 21 on the rear edge of the platform engage the transverse member 17 in the operative position of the scaffold so as to secure the two frames 1, 7 to each other in fixed angular relationship.
  • the longitudinal members of the rear frame 7 are normally conformingly received in notches 22 in the rear edge of the platform 19.
  • Two short links 23 are hingedly secured near the center of the transverse frame member 16. They are respectively connected to the free ends of a U-shaped pedal 24 'by pivot pins 25, as is best seen in FIG. 2.
  • Similar sleeves 29, 30 are fixedly attached to the upper transverse member 8 and to the lower transverse member 6 of the front frame.
  • the upper tubular portion 31 of a steering column is journaled in the sleeves 28, 29, and the lower steering column portion 32 is journaled in the sleeve 30 and is telescopically received in the upper portion 31 with which it is adjustably connected by a locking pin 4.
  • the steering oolumn is rotatable and axially slidable in the bearing sleeves.
  • the sleeve 28 normally rests on a fixed collar 33 on the steering column portion 31.
  • the top of the steering column carries a cross bar 34 whose ends are equipped with handle grips 35.
  • a heavy casing 36 is fixedly attached to the bottom of the steering column and is slotted in a plane which includes the axis of the steering column.
  • the slot 37 in the casing 36 is downwardly and laterally open.
  • An axle 38 passes through the slot 37 and is pivotally attached to the casing 36 in the slot 37 by a pin 40.
  • the width of the slot 37 is only insignificantly greater than that of the axle 38, wherein the axle is capable of limited pivoting movement in a vertical plane on the pin 40, but cannot move horizontally relative to the steering column.
  • the ends of the axle 38 respectively carry two front wheels 41 on stationary shafts 39, as shown in detail in FIG. 3.
  • Each wheel has a rubber tread 42 and is equipped with a simple automatic brake which permits rolling movement of the wheel in one direction while preventing rota 3 tion in the opposite direction.
  • the brake consists of a hook member 43 which is pivotally attached to the axle 38 by a pin 44 and whose free hooked end 45 envelops the tread 42.
  • the axes of the shaft 39 and of the pin 44 are parallel, and spaced from each other, whereby the free end 45 engages the tread 42 and selectively arrests rotation of the wheel 41 in the direction of the arrow 46.
  • the scaffold is normally stored and transported in the collapsed condition shown in FIG. 4 in which the hooks 21 are disengaged from the transverse rear frame member 7, and the platform 19 is pivoted toward the lower portion of the front frame 1.
  • the front frame 1, rear frame 7, and steering column 31, 32 are reduced to their minimum height by telescoping movement of their longitudinal members, and the front and rear frames are moved close to each other about the pivots 10.
  • the scaffold is made ready for use in a few minutes by first pivoting the front and rear frames apart until the platform 19 can be hooked over the transverse rear frame member 17, thereby to secure the two frames in a fixed angular relationship.
  • the steering column and the several longitudinal frame members are next extended to the desired length, and secured in their extended positions by the locking pins 4.
  • the axles 14 and the rear wheels 15 are pulled out of the tubular member 13 as indicated in broken lines in FIG. 1 in order to broaden the base of the scaffold and to improve its stability under adverse conditions of loading.
  • the scaffold is then turned upright.
  • the vertical spacing of the platform 19 from the pivots 10 is the same regardless of the overall length of the upright scaffold members.
  • the parts of the rear frame members 11 nearest the pivots 10 are approximately horizontal in the normal operating position of the scaffold and form lateral guard rails for a workman standing on the platform 19.
  • the front end of the scaffold rests on the legs 5.
  • the front Wheels 41 may touch the floor but they merely support the Weight of the steering column 31, 32.
  • the bearing sleeve 28 and the collar 33 may be vertically spaced from each other in the working position of the scaffold, but this is not necessary nor actually desirable.
  • the workman standing on the platform 19 then oscillates the cross bar 34 in a horizontal plane through an angle which should be smaller than 90 if movement in an approximately straight forward path is desired.
  • the scaffold moves in arcuate steps, the left front wheel rolling forward and the right front wheel being arrested by its brake hook 43 while the handle grips 35 are moved clockwise, as viewed from above, and only the left wheel rolling and vice versa during counterclockwise movement of the handle grips 35.
  • the strokes of the cross bar 34 in one direction are made longer than those in the other direction
  • the scaffold may also be moved backward by oscillating the cross bar 34 after the steering column has been turned
  • the pivoting attachment of the front axle 38 to the steering column portion 32 by the pin 40 is essential to make the propelling and steering mechanism fully effective where the scaffold has to travel over small obstacles of the type unavoidable on a building site, or on the run ways of an airport, or over a building floor which is not perfectly flat.
  • a self-propelled scaffold comprising, incornbina-v tion:
  • shifting means for shifting said front wheels relative to said front legs between a first normal position in which said front and rear wheels are adapted to engage a supporting surface while said front legs are upwardly spaced from said surface, and a second norrnal position in which said front legs and rear wheels are adapted to engage said surface, 7 4
  • said shifting means including a shifting link age movably mounted on-said frame and acces sible from said platform, said linkage operatively connecting said front legs and said front wheels for movement relative to each other.
  • a self-propelled scaffold comprising, in combination:
  • said securing means including a platform member hingedly attached to the upper portion of said front frame, and
  • a steering column elongated in the direction of elongation of said front frame, said steering column being mounted on said frame for rotary movement about a'longitudinal axis and for axial translatory movement, and having an upper longitudinal portion and a lowerv portion;
  • pin means connecting said central portion of said front axle to the lower portion of said steering column for pivotal movement of said front axle on said column;
  • said switching means including a lever memher

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Mechanical Engineering (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Handcart (AREA)
  • Motorcycle And Bicycle Frame (AREA)
  • Tires In General (AREA)
  • Movable Scaffolding (AREA)
US465917A 1965-05-06 1965-06-22 Self-propelled scaffold Expired - Lifetime US3276542A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR16163A FR1442515A (fr) 1965-05-06 1965-05-06 Perfectionnements aux échafaudages roulants et tractables

Publications (1)

Publication Number Publication Date
US3276542A true US3276542A (en) 1966-10-04

Family

ID=8578199

Family Applications (1)

Application Number Title Priority Date Filing Date
US465917A Expired - Lifetime US3276542A (en) 1965-05-06 1965-06-22 Self-propelled scaffold

Country Status (8)

Country Link
US (1) US3276542A (xx)
CH (1) CH419551A (xx)
DE (2) DE1534912B1 (xx)
ES (1) ES315318A1 (xx)
FR (1) FR1442515A (xx)
GB (1) GB1123182A (xx)
IL (1) IL25590A (xx)
NL (1) NL6606124A (xx)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4690248A (en) * 1984-07-18 1987-09-01 Killeen Walter H Portable hoist
WO1996027729A2 (fr) * 1995-03-03 1996-09-12 Pierre Pommier Ensemble constitue, nacelle et plate-forme de travail en hauteur avec acces sur escamobile et le convertible esca 2000, echelle automobile a propulsion manuelle et entrainement multidirectionnel
US5722506A (en) * 1993-10-04 1998-03-03 Sanritsu Giken Kogyo Kabushiki-Kaisha Movable working platform
US20020125662A1 (en) * 2000-08-29 2002-09-12 Annop Magness Combination lifting, platform, handtruck, scaffold, floorjack and mechanic cleeper
US20070084668A1 (en) * 2005-10-13 2007-04-19 D.O.T. Patio & Home Apparatus and method for human powered movement of a scaffold structure
CN102635224A (zh) * 2012-03-22 2012-08-15 阳江市飞轮金属制品有限公司 人力驱动型铝移动平台
CN102635222A (zh) * 2012-03-22 2012-08-15 阳江市飞轮金属制品有限公司 有抬升装置的人力驱动型铝移动平台
US20130168185A1 (en) * 2012-01-02 2013-07-04 Wen-Hsiu Huang Movable Lift
US20140053665A1 (en) * 2012-08-22 2014-02-27 Brian Andrew Jutte Vechicle and method for tending to an elevated livestock cage
US9410374B2 (en) * 2013-09-03 2016-08-09 Robert Horton SHANKS Ladder lift
USD933715S1 (en) 2020-01-24 2021-10-19 Cruiser Products, Llc Agricultural vehicle with a fixed-height elevated platform
USD933716S1 (en) 2020-01-24 2021-10-19 Cruiser Products, Llc Agricultural vehicle with a variable-height elevated platform

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4442919A (en) * 1981-08-10 1984-04-17 Fulcher Rodney D Portable tower
GB2163206A (en) * 1984-07-27 1986-02-19 Ah Engineering Limited A foldable platform
GB2282631A (en) * 1993-10-05 1995-04-12 Glyndwr David Sparrow Decorating appliance
US9109396B2 (en) * 2012-08-24 2015-08-18 Ballymore Company, Inc. Ladder having narrow base
DE102020131268A1 (de) 2020-11-25 2022-05-25 Christoph Schuler Selbstfahrende Montagebühne

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2237688A (en) * 1939-09-13 1941-04-08 Lawrence E Eichel Tractionally operated ladder
US2923373A (en) * 1957-10-28 1960-02-02 Rol Away Truck Mfg Company Inc Extensible platform truck
US2989139A (en) * 1959-08-07 1961-06-20 Pantek Stanley Mobile stand

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1439388A (en) * 1921-06-06 1922-12-19 Benedict E Willett Stepladder
US2380160A (en) * 1943-06-29 1945-07-10 Robert W Fieroh Propelled and steered step stand
US2964122A (en) * 1958-01-07 1960-12-13 Up Right Inc Scaffold
DE1780015A1 (de) * 1968-07-23 1972-01-13 Daimler Benz Ag Waermetauscheranlage fuer Kraftfahrzeugheizungen

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2237688A (en) * 1939-09-13 1941-04-08 Lawrence E Eichel Tractionally operated ladder
US2923373A (en) * 1957-10-28 1960-02-02 Rol Away Truck Mfg Company Inc Extensible platform truck
US2989139A (en) * 1959-08-07 1961-06-20 Pantek Stanley Mobile stand

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4690248A (en) * 1984-07-18 1987-09-01 Killeen Walter H Portable hoist
US5722506A (en) * 1993-10-04 1998-03-03 Sanritsu Giken Kogyo Kabushiki-Kaisha Movable working platform
WO1996027729A2 (fr) * 1995-03-03 1996-09-12 Pierre Pommier Ensemble constitue, nacelle et plate-forme de travail en hauteur avec acces sur escamobile et le convertible esca 2000, echelle automobile a propulsion manuelle et entrainement multidirectionnel
WO1996027729A3 (fr) * 1995-03-03 1996-10-31 Pierre Pommier Ensemble constitue, nacelle et plate-forme de travail en hauteur avec acces sur escamobile et le convertible esca 2000, echelle automobile a propulsion manuelle et entrainement multidirectionnel
US20020125662A1 (en) * 2000-08-29 2002-09-12 Annop Magness Combination lifting, platform, handtruck, scaffold, floorjack and mechanic cleeper
US7188843B2 (en) * 2000-08-29 2007-03-13 Annop Magness Multiuse lifting and rolling platform
US20070084668A1 (en) * 2005-10-13 2007-04-19 D.O.T. Patio & Home Apparatus and method for human powered movement of a scaffold structure
US20130168185A1 (en) * 2012-01-02 2013-07-04 Wen-Hsiu Huang Movable Lift
CN102635222A (zh) * 2012-03-22 2012-08-15 阳江市飞轮金属制品有限公司 有抬升装置的人力驱动型铝移动平台
CN102635224A (zh) * 2012-03-22 2012-08-15 阳江市飞轮金属制品有限公司 人力驱动型铝移动平台
US20140053665A1 (en) * 2012-08-22 2014-02-27 Brian Andrew Jutte Vechicle and method for tending to an elevated livestock cage
US9574356B2 (en) * 2012-08-22 2017-02-21 Cruiser Products, Llc Vehicle and method for tending to an elevated livestock cage
US10602723B2 (en) 2012-08-22 2020-03-31 Cruiser Products, Llc Method of tending to livestock within a livestock confinement facility
US9410374B2 (en) * 2013-09-03 2016-08-09 Robert Horton SHANKS Ladder lift
USD933715S1 (en) 2020-01-24 2021-10-19 Cruiser Products, Llc Agricultural vehicle with a fixed-height elevated platform
USD933716S1 (en) 2020-01-24 2021-10-19 Cruiser Products, Llc Agricultural vehicle with a variable-height elevated platform

Also Published As

Publication number Publication date
ES315318A1 (es) 1966-03-16
DE1534912B1 (de) 1970-09-03
CH419551A (fr) 1966-08-31
FR1442515A (fr) 1966-06-17
NL6606124A (xx) 1966-11-07
IL25590A (en) 1970-01-29
GB1123182A (en) 1968-08-14
DE1924117U (de) 1965-09-23

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