US3817346A - Mobile scaffolding - Google Patents

Mobile scaffolding Download PDF

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Publication number
US3817346A
US3817346A US00282157A US28215772A US3817346A US 3817346 A US3817346 A US 3817346A US 00282157 A US00282157 A US 00282157A US 28215772 A US28215772 A US 28215772A US 3817346 A US3817346 A US 3817346A
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Prior art keywords
scaffolding
base
screw
motor
platform
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US00282157A
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English (en)
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D Wehmeyer
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Individual
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Individual
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Priority to US00282157A priority Critical patent/US3817346A/en
Priority to AU59011/73A priority patent/AU5901173A/en
Priority to IT28008/73A priority patent/IT993736B/it
Priority to JP48093246A priority patent/JPS49124801A/ja
Priority to DE19732342062 priority patent/DE2342062A1/de
Priority to FR7330286A priority patent/FR2197397A5/fr
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    • 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
    • E04G1/18—Scaffolds primarily resting on the ground adjustable in height
    • E04G1/22—Scaffolds having a platform on an extensible substructure, e.g. of telescopic type or with lazy-tongs mechanism
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
    • B66F11/00—Lifting devices specially adapted for particular uses not otherwise provided for
    • B66F11/04—Lifting devices specially adapted for particular uses not otherwise provided for for movable platforms or cabins, e.g. on vehicles, permitting workmen to place themselves in any desired position for carrying out required operations
    • B66F11/042—Lifting devices specially adapted for particular uses not otherwise provided for for movable platforms or cabins, e.g. on vehicles, permitting workmen to place themselves in any desired position for carrying out required operations actuated by lazy-tongs mechanisms or articulated levers
    • 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

Definitions

  • ABSTRACT There is disclosed a mobile scaffolding which is powered by self contained electrical storage batteries.
  • the electric drive is mechanically linked to the lift mechanism of the scaffolding by mechanical means comprising screw means and a mating nut means interconnected by rolling means to provide a high efficiency coupling.
  • the lift mechanism employs very compact spring means which is biased to extend the lift mechanism from its contracted position to provide a force that supplements the electric drive when the mechanism has the most unfavorable lever moment for ex tension of the scaffolding.
  • the unit has a self contained power means for mobility and a self contained directional control means with remote control means whereby the entire unit can be controlled from the scaffolding platform with a single lever that actuates the lift, drive and steering motors.
  • the construction industry particularly that of tilt up wall construction employs scaffolding to a large extent for installation of ceilings and overhead utility facilities.
  • This construction is used largely for warehouse and industrial building construction.
  • the foundation and floor are generally poured concrete and the walls are formed as concrete panels which are cast on the floor and are then tilted upright and secured in place. These walls can be from about 8 to 30 feet in height.
  • An extremely efficient mechanical drive means for use in the lift unit is a screw with mating screw engagement means having rolling contact with the screw.
  • the screw means can be combined with electric motive power means in a highly efficient, portable or mobile scaffolding unit having a minimum collapsed height and maximum extended height.
  • Such a mechanical drive mechansim can be used with a portable scaffolding device provided that compact resilient means are provided to bias against the platform or any of the members of the extendible assembly linking the platform to the base when the platform is in its retracted position.
  • the compact resilient means comprises at least one massive compression spring which is coaxially placed about the lift screw so that it is compressed when the platform is collapsed and is operative to release its stored force to supplement the lift power means when the platform is extended.
  • the mobile scaffolding of this invention comprises: a base, wheels carried thereon, electric power means linked to at least one of the wheels to provide mobility to the base, directional control means to pivot at least one of the wheels and provide steering of the base, a platform, an extendible assembly mechanically interconnecting said platform and base and comprising at least one pair of arm members joined together in a pivotable connection at an intermediate point of their length, platform attachment means securing a pair of free ends of the extendible assembly to the platform and base attachment means securing the free ends of the opposite end of the assembly to the base, while permitting the sliding engagement of at least one of either or both of said pairs of free ends with its respective platform or base, lift means operatively attached to at least one end of the extendible assembly comprising screw means transversely positioned to the direction of extension of the assembly, screw engagement means cooperative therewith, electrical lift motor means, interconnecting means linking said motor in rotational driving connection to one of said screw and screw engaging means to one of said pair of free ends whereby rotational movement of said motor effects extension and retraction
  • the scaffolding has remote control means carried on the platform to control the actuation of the lift mechanism and the movement of the unit about the building.
  • the entire operation of the unit can be controlled by a single hand control that actuates switches in the respective circuits for the drive power means, the directional control power means or the lift motor means.
  • FIG. 1 illustrates the mobile scaffolding unit in its most extended position
  • FIG. 2 is a plan view of the base of the unit;
  • FIG. 3 is a sectional view along the line 3-3 of FIG. 2;
  • FIG. 4 illustrates the slidable connection of the extendible assembly
  • FIG. 5 illustrates the electrical circuit of the unit
  • FIGS. 6 and 7 illustrate the hand control of the unit.
  • the mobile scaffolding unit comprises a base 10, a platform 20 and an extendible assembly 30 mechanically interlinking the platform and the base.
  • Base 10 has a protective cover 12 with sidewalls.
  • the unit has a pair of rear wheels 14 and a pair of forward wheels 16.
  • the rear of base 10 is covered by a plurality of cover plates 18.
  • the forward pair of wheels 16 are steerable and are mounted on base 10 with means permitting their axes to be turned to the right or left of the base.
  • the platform 20 has a floor 21 with a protective railing 22 about its periphery and an open section for access at its rear end. If desired, the railing can fold away from the platform or a gate can be furnished for the open section.
  • the platform preferably carries a control console or pedestal 9 which supports an instrument and control box 24 for operation of the unit.
  • the extendible assembly 30 comprises at least one and, preferably, two pairs of arm members 31, 32, 33 and 34 which are pivotably interconnected at points intermediate their lengths, at hubs 35 and 36. For maximum stability, these pairs of arm members are duplicated at each side of the scaffolding unit and are identified by common numbers.
  • Each assembly has one pair of its free ends, e.g., the upper ends of arm members 31 and 32, attached to the platform and, at its opposite end, has the free ends of its arm members, e.g., the lower ends of arm members 33 and 34 attached to the base 10.
  • the attachment means at the front of the base can be bracket members 37 which are supported on the frame of the base. A similar pair of bracket members can be provided on the forward edge of the undersurface of platform 20.
  • the extendible assemblies 30 are vertically extendible and, accordingly, at least one of each pair of free ends of the assemblies is attached to either the base or platform by means permitting its sliding engagement therewith. While the free ends of both arm members 31 and 32 can slidably attach to the platform and the free ends of both arm members 33 and 34 can slidably attach to the base, it is preferred that only one of each of these pairs be slidably attached to its respective base or platform. This is shown in FIG. 1 where the lower end of the arm members 33 of each of the assemblies is slidably attached to the base 10. The ends of these members are secured to curved flange plates 38 and 37 which extend through grooves 40 and 41 and into the housing of base 10. The upper ends of members 32 bear rollers which are free to move in channels on the underside of the platform. The remaining member of each pair of free ends is secured to its respective platform or base by brackets.
  • All the power and drive mechanisms for the unit can be contained within the housing of base 10, including the electrical energy storage means, motive power means for propulsion of the unit, its directional control and extension of the platform.
  • FIGS. 2 and 3 illustrate the construction and assembly of base 10.
  • the base is formed by a pair of longitudinal beams 50 and 51 that run the length of the base. These can be formed of sheet metal welded to provide an upright, open channel.
  • Two transverse beams are provided; 52 at the front of and 53 intermediate the lengths of the longitudinal beams.
  • a sheet 67 also extends transversely across the base a short distance behind beam 52 and has an offset pocket 68 at the midline of base 10.
  • the front of base is covered by plate 54 while the rear portion is covered by plates 18 which extend between beams 50 and 51.
  • the plates have a short lip that overhangs the inside wall of these beams to hold them in place.
  • a narrow plate, 55 is secured over the channel and provides open slots 40 and 41 along each beam.
  • Cover plate 54 extends to about 12 inches of both edges of the unit.
  • the remainder of the top comprises a hinged cover 56 at each side of the unit as shown in FIG. 1. Beneath the hinged cover are compartments for the control circuit components 57, battery charger 74 and the electrical batteries 129 which are placed six at each side.
  • the longitudinal beams have apertures near their rear ends and support outboard brackets 58 in line with the apertures.
  • the rear axles 59 extend through the apertures and through a bearing support carried by bracket 58.
  • a conventional differential 60 is supported on the midline of the base 10 with its axles extending to universal joints 61 that connect to axles 59. Other means such as flexible couplings can also be used in lieu of the universal joints.
  • the power drive to the differential comprises electric motor 62, a conventional direct current motor of suitable voltage, e.g., 6 to 42 volts, that is linked by sprockets and chain 63 to the differential input shaft.
  • the forward wheels 16 are mounted on axles having upright spindles that are journaled at 64 by a sleeve carried at the outboard end of beam 52.
  • a trailing arm 65 projects from the wheel spindle and is pivotably secured to a tie rod 66.
  • the inboard end of rod 66 is secured to shaft 72 by a ball joint coupling 73.
  • the steering motor and its mechanical linkage are mounted at the front center of base 10.
  • the motor 10 fits into the pocket or housing 68 in transverse sheet 67 and is supported by bracket 69 that is carried by beam 52.
  • the shaft of motor 70 is connected to gear box 71.
  • Shaft 72 projects through gear box 71 and has a mid section bearing screw threads which engage a mating nut in gear box 71.
  • the nut is secured to a pinion gear that is meshed with a worm gear which is connected to the motor shaft so that rotation of the motor effects side to side movement of rod 66.
  • the lift assembly comprises two pairs of interconnected arms at each side of the unit.
  • the arms are preferably formed by welding together the edges of two channels to form a hollow beam having the illustrated shape.
  • the lower ends of arms 34 are pivotably secured on base 10 by brackets 37 which are secured to the forward ends of the longitudinal beams 50 and 51.
  • the lower end of arm 33 is secured to plates 38 and 39 which project into base 10 and are mounted therein in sliding engagement with wheels such as 75 that are contained within channel beams 50 and S1 and that roll on the inside bottom of these channel beams.
  • FIG. 4 illustrates the construction of the lower end of the arms 33.
  • Plates 38 and 39 are secured, preferably by welding to the opposite sides of the arms 33.
  • the plates are bored at 76 and collar 77 is fltted into each bore.
  • the collar has an annular flange 78 which fits against the outer side of the plate and can be secured thereto by welding or other suitable means.
  • a bronze bushing 79 is placed within collar 77.
  • Mounted between the plates 38 and 39 is cylindrical block 80. This block has trunions 81 at each end and a central bore 82 to accomodate shaft 83. The bosses 81 fit in bearing relationship to bushing 79.
  • Bore 85 is tapped transversely through block 80 and set screw 84 is provided to lock shaft 83 in the block after assembly of the elements.
  • the wheels 75 are similarly carried on shaft 83 with a bushing.
  • Block 80 is bored at 86 and and the end of shaft 87 is threaded into one end of clevis 64 which is free to pivot with its opposite end having a bore for shaft 83.
  • Each of the shafts 87 bears screw means, threads 88, as shown in FIGS. 2 and 3 for the right side shaft. These shafts lie within the channel beams 50 or 51.
  • Each shaft 87 projects through a gear housing 89 and a flange plate 99 which extends across the channel directly forward of gear housing 88.
  • the end of shaft 87 which is opposite block 80 projects into tubular member 90 and bears a collar 91 that is secured thereto by threads, welding or the like.
  • Tubular member 90 has an end plate which is bored to receive shaft 87 in a sliding fit and which serves as a stop to collar 91.
  • the opposite end of member 90 is open and bears annular collar 92 about its outer periphery.
  • Resilient means comprising compression spring 93 is mounted about member 90 and is biased between flange 99 and collar 92. The retraction of the extendible assembly into the position shown in FIG. 3 compresses resilient springs 93.
  • the springs are selected so that the dead weight of the platform and extendible assembly is sufficient to compress the springs, thereby insuring that in the event of failure of the lift motor, the unit can still be retracted.
  • the gear housings 89 comprise conventional units wherein screw threads 88 engage in rolling contact at a nut that is driven by a worm gear on shaft 98. While other gear drives could be used, the drive with rolling contact is preferred for its high efficiency.
  • a commercially available gear drive that can be used for this is a ball screw .Iactuator described in US. Pat. No. 3,178,958 and manufactured by the Duff-Norton Company, North Carolina.
  • the nut of this unit, which is driven by screw threads on shaft 98 has a helical race for ball bearings to provide a recirculating, rolling contact with the threads on shaft 98. This gear drive is preferred for its high efficiency.
  • Other gear drives e.g., a direct worm gear be used, if desired.
  • the shafts 98 are coupled through flexible couplings 100 to shaft 101 that is mechanically linked by chain 103 to electric motor 102.
  • the outboard end of shaft 98 extends through gear housing 89 and bears brake means 104.
  • Any conventional brake means can be used, preferably the brake has a solenoid which is biased to lock the brake and is unlocked by the application of a direct current voltage to the solenoid coil.
  • the brake should also have manual means for its release and at least one of shafts 98 is extended, as shown, so that a crank can be attached to the shaft to permit manual lowering of the lift platform.
  • Resilient spring means 93 are effective throughout 1 the initial movement of the arms of the extendible assemblies from their positions shown in FIG. 3.
  • the springs should be compressed against the assembly during translation of the arms through an are from their compressed position, shown in FIG. 3. to an angle of about 45, preferably about 40 to the axis of the screw shaft 87.
  • the arms in the embodiment shown in FIG. 3 have an angle to this axis when in the compressed position of about 7. Consequently, the springs are under compression when the arms are at an inclined angle to the axis of shafts 87 of from 7 to 40.
  • Other embodi' ments can have varied minimum angles of inclination from 2 to about however, with most embodiments, the maximum angle of about 45, for compression of the springs would be applicable.
  • the resilient spring means are coaxial with the screw means to form a very compact power unit. Placement of these compression springs in the indicated position avoids expanding the structure to any significant degree and insures a minimum collapsed height to the unit.
  • shafts 87 are moved forward in their channels 50 and 51.
  • the position of the forward end of these shafts is shown by the broken lines in FIGS. 2 and 3.
  • the forward ends project past flanges 105 which are transversely positioned in the channels and which have a central bore through which the shafts project.
  • the unit has a lift capacity of 2,000 pounds with a lift motor of 3.25 horsepower, a drive motor of 2.25 horsepower and a steering motor of 0.5 horsepower, all at 36 volts.
  • the unit has twelve six volt batteries and has a useful work period of 10 hours continuous use between recharging cycles. This is sufficient for about 5 days of normal use.
  • the extendible height of the scaffolding platform 20 above the floor surface is 20 feet and the collapsed or retracted height is 4.5 feet.
  • the unit has a maximum ground speed of 7 miles per hour and a minimum lift time of from 30 to 40 seconds at the rated capacity load of 2,000 pounds.
  • the entire unit can be controlled with a single hand lever which is mounted in a control box 24.
  • the control box is illustrated in FIG. 6 and the control circuit for the unit, including that of the control box, is shown by FIG. 5.
  • the circuit of the control box is shown at the left of FIG. 5 within the box defined by the broken lines.
  • the control box 24 has a hinged cover panel 152 that supports a key switch 154 and a manual four pole, double throw selector switch 156. The two throw positions of this switch are identified as Lift and Drive on FIG. 5.
  • the cover is slotted at 158 and a T-bar handle 160 protrudes through this slot.
  • the handle has a threaded shaft 162 that is turned into a tapped bore of tube 164.
  • the latter tube is slidably mounted in a larger diameter tube 166, the base of which bears journal 168 that is mounted on and secured to shaft 170.
  • Shaft 170 is the shaft extension from the accelerator master switch, not shown.
  • the shaft has a segment gear mounted on it that drives a pinion gear which in turn rotates the wiper of potentiometer 174, shown in FIG. 5.
  • the shaft also bears cams which move the levers of each of switches 176 and 178 also shown in FIG. 5.
  • the cams of switch 176 are actuated.
  • this will close the contacts to the up relay of the contactor panel 132 or the forward relay of contactor panel 133.
  • the handle is pulled back in slot 158, it pivots shaft 170 and actuates the cam of switch 178. Again, depending upon the position of selector switch 156, this either closes the contacts of the down relay of panel 132 or the. contacts of the reverse relay of panel 133.
  • the operation of these relays will be described in greater deail hereinafter.
  • a compression spring is in tube 166 and seats against journal 168.
  • the spring is biased against the lower end of tube 164 and this tube is retained in tube 166 by pin 180 that extends from a transverse bore in tube 164 outwardly and into an inverted T- groove 182.
  • the spring urges the handle assembly of tube 164 and handle 160 upwardly so that pin 180 seats in the upright leg of groove 182, thereby locking the handle assembly against rotation about its axis.
  • the upper end of tube 164 bears a bracket 184 to which are secured two normally open microswitches 186 and 188. These switches have spring arms which support rollers 190 and 192 that bear against the side of the control box 150. A view of the bracket and switches appears in FlG. 7. As the handle 160 is rotated clockwise about its axis, the switch lever of switch 188 is moved into contact with its spring arm and is depressed against this arm sufficiently to close its contacts. Switch 188 actuates the relays of the steering motor 124 to cause the motor to turn the forward wheels towards the right. Switch 186 actuates other relays to reverse the current through motor 124 and turn the wheels to the left.
  • the steering motor 70 and its normally open relays 190, 191, 192 and 193 are shown at the upper right of FIG. 5.
  • the positive lead 130 is connected to the coils of the relays and to the contacts of relay 193 and 190 while negative lead 140 is connected to the contacts of relays 191 and 192.
  • switch 186 is closed by clockwise rotation of handle 160 and when selector switch 156 is in the Drive position, thecoils of relays 192 and 193 are grounded to the negative lead 140 through normally closed left limit switch 194.
  • the limit switch is mounted on the unit near gear box 71 so that when the wheels have turned the maximum degree the contacts of this switch are opened by engagement with the left end of shaft 72 or by left tie rod 66.
  • Closing of the contacts of relays 192 and 193 permits current to flow from lead 130 through the relay contacts, the windings of motor 70 to negative lead 140.
  • the contacts of limit switch 194 will be forced open, breaking the circuit to the relay coils.
  • Closing of the contacts of microswitch 188 by counterclockwise movement of handle 160 will close the contacts of relays 190 and 191 and cause current to flow through relay 190, the windings of motor 70 in an opposite direction than previously described, the contacts of relay 191 and through limit switch 195 whichch will open when the wheels have turned the maximum degree to the right.
  • the control circuits for the lift and drive motors are based on commercially available circuit components which have silicon controlled rectifiers, SCRs. Each motor control circuit employs a silicon controlled rectifier panel, a contactor pane] and a pulse monitoring trip card. Both motors are controlled with a single accelerator master switch, which as previously mentioned is actuated by handle 160.
  • the silicon controlled rectifier circuit employs a SCR to provide a pulsed input to the motor contacts at a frequency of 50 to 300 times per second.
  • the duration of the closed motor contact period is a fixed value determined by the rate of charge of a fixed capacitor in the silicon controlled rectifier panel while the duration of the open motor contact period is variable and is determined by the rate of charge of a capacitor which isin series with a potentiometer in the accelerator master control circuit.
  • the wiper of the potentiometer is mechanically linked to the accelerator control so that the resistance can be varied; high resistance limiting the current flow to charge the turn-on capacitor and thereby limiting the frequency of on cycles to the motor and low resistance, conversely, increasing the number of on cycles and increasing the duration of the on time to the motor.
  • the potentiometer previously mentioned, is shown at 174 in FIG. 5.
  • the motors operate on the average voltage supplied to them.
  • a low frequency of on cycles is the same as a steady state low voltage so that the motors turn slowly and their speed increase with increasing frequency of on cycles, i.e., increasing average voltage.
  • Some refinements of the circuit include placing a diode across the motor terminals so that induced current can flow through the motor windings during the off cycles, greatly increasing the efficiency of the motor operation.
  • the components for the lift and drive motor control circuits are available from the General Electric Company and are described in detail in the General Electric publication RKE-lS 1, Static Control for Electric Vehicles. These components are illustrated in FIG. 5 in the integrated circuit for the scaffolding unit.
  • the lift motor is shown at 102 and the drive motor at 62.
  • the armature contacts of these motors are shown at 119 and 121 and 123 and 125 for motors 102 and 62 respectively.
  • the field or stator contacts are and 116 and 117 and 118.
  • the terminals of the armatures and fields of the motors are connected through magnetic contactor panels 132 and 133. These panels each have three relays, two of which are opposite acting double throw relays and are identified as D and U on panel 132 and R and F on panel 133. The connections to the switch contacts of these relays are shown while the relay actuating coils are omitted to simplify the drawing.
  • the positive lead 130 from batteries 129 is connected, through circuit breaker 131, to an armature contact of each motor, 119 and 123.
  • the other armature contact of the lift motor 102 is connected to the normally open switch terminals of down relay D and up relay U in the magnetic contactor panel 132.
  • the armature contact of motor 62 is similarly connected to the normally open terminals of the reverse relay R and the forward relay F of the magnetic contactor panel 133.
  • One of the stator contacts of each motor, 115 and 117 is connected to the switch pole terminal of the up relay U and the forward relay F of its respective panel 132 or 133.
  • the opposite stator contacts 116 and 118 are connected to the switch pole terminal of the down relay D and reverse relay R of their respective panels 132 and 133.
  • the normally closed terminals of the relays are commonly connected to terminal T2 of their respective SCR control circuit.
  • the circuit through the motor and its contactor panel is described herein with regard to lift motor 102.
  • the current flows from positive lead through the armature of the motor, the closed contacts of the up relay U, to stator contacts 115, through the field of the motor 102 to line 181 through the normally closed contacts of the down relay D to contact T2 of the SCR panel and, in a controlled pulsing, through SCR panel to the negative contact of the panel.
  • the up and down relay switches are reversed, the current flows through the armature, through the down relay D to stator contact 116, through the field of motor 102 in an opposite direction to that previously described to line 181 through the normally closed contacts of the up relay U.
  • the actuating coils for the relays of the magnetic contactor panels are not shown, however, the connecting leads to these coils are shown in FIG. as line 110 from terminal 8 and line 111 from terminal 6 of terminal connector'strip 134 which lead to the coils of the down relay D and up relay U, respectively.
  • the opposite terminals of the relay coils have a common lead 112 which extends to terminal 13A of the terminal connector strip 134.
  • the selector switch 156 connects switches 176 and 178 into the control circuit for the drive motor 62. With the selector switch in the lift position, closing of switch 176 by moving lever 160 forward will permit current to flow from the positive lead 130, through lead 113 and the lift up limit switch 198 to contact 6 of the terminal connector strip 134. This contact is connected to the coil of the up relay U, the opposite terminal of which is connected to terminal 13A of terminal connector strip 134. Lead 115 connects 13A to contact 5 of thesafety card 136. Contact 5 of this card is internally connected to the negative terminal 1 by a safety circuit which disconnects the internal connection in the event that excessive voltage appears across terminals 2 and 3 of the card. Terminals 4 and 6 of the card are connected to the positive lead and are connected to an internal circuit which requires that the external circuit to terminal 5 be opened to reset the card in the event that the internal connection is opened by an overload condition.
  • the limit switches for the lift motor 102 are located on the unit so that the up limit switch 198 is opened when the assembly is fully extended and the down limit switch 197 is opened when the assembly is fully retracted.
  • a mobile scaffolding machine having:
  • an extendible assembly mechanically interlinking said platform and base and comprising at least one pair of arm members joined together in a pivotable connection at an intermediate point of their length;
  • platform attachment means securing a pair of free ends of said extendible assembly to said platform
  • said attachment means including longitudinal channel means carried on each of said platform and base and wheeled means engaged therein and carried by at least one of each of the pairs of free ends of said assembly to permit its sliding engagement with its respective platform or base;
  • lift means operatively attached to at least one end of said extendible assembly comprising screw means positioned transversely to the direction of extension of said assembly, screw engagement means cooperative therewith, electric lift motor means, interconnecting means linking said motor in rotational driving relationship to one of said screw and screw engagement means and means securing at least one of said pair of free ends at said one end of said extendible assembly to at least one of said screw and screw engagement means whereby rotational movement of said motor effects the extension and retraction of said assembly;
  • resilient means comprising compression coil spring means carried on said scaffolding coaxially with said screw means to engage said extendible assembly between its retracted position and a partially extended position having said arm members at an angle no greater than about 45 degrees to the horizontal and to urge extension of said assembly from said retracted position to said partially extended position whereby the force stored in said resilient means by retraction of said assembly is available for supplementing the force of said motor means through the positions of said assembly having the most disadvantageous lever moments to said screw means.
  • said base carries: electric power means, means linking said power means to at least one of said wheels to drive said scaffolding, directional control power means, means linking said control power means to at leat one of said wheels to steer said scaffolding, and a source of electrical energy with connector means to said electric power means.
  • said extendible assembly comprises two assemblies of arms located at each side thereof.
  • each of the extendible assemblies of arms comprises four arms pivotably interconnected.
  • each of said platform and base attachment means includes a set of fixed brackets at one end of said scaffolding.
  • said screw means comprises at least one screw rod longitudinally carried by said base with one end thereof secured to said one end of said extendible assembly and the opposite end thereof extending to said interconnecting means, the latter comprising a rotating nut drive member engaged by said screw rod in a thread drive housing.
  • a mobile scaffolding machine comprising:
  • each of said channel means having a pivot fixture located at one end thereof;
  • a first screw rod having one end connected to one of said dolly means and extending coasially therefrom in its associated channel means toward its pivot fixture;
  • a second screw rod having one end connected to the other of said dolly means and extending coaxially therefrom in its associated channel means toward its pivot fixture;
  • first thread drive housing fixedly mounted intermediately of one of said channel means and having a rotating nut drive member engaging the threads of said first screw rod;
  • a second thread drive housing fixedly mounted intermediately of the other of said channel means and having a rotating nut drive member engaging the threads of said second screw rod;
  • the manually controlled device includes a lever means which includes a reversing switch and a potentiometer whereby advancing the lever from a neu tral position in one direction will cause the motor to drive clockwise at a rate proportional to the displacement of said lever from a neutral position and the advance of said lever from said neutral position in the other direction will cause said motor to rotate in a counter-clockwise manner proportional to the distance said lever is moved from said neutral position.

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  • Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Architecture (AREA)
  • Mechanical Engineering (AREA)
  • Civil Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Handcart (AREA)
  • Movable Scaffolding (AREA)
US00282157A 1972-08-21 1972-08-21 Mobile scaffolding Expired - Lifetime US3817346A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
US00282157A US3817346A (en) 1972-08-21 1972-08-21 Mobile scaffolding
AU59011/73A AU5901173A (en) 1972-08-21 1973-08-08 Mobile scaffolding
IT28008/73A IT993736B (it) 1972-08-21 1973-08-20 Impalcatura mobile e a quota regolabile in un ampio intervallo
JP48093246A JPS49124801A (enrdf_load_stackoverflow) 1972-08-21 1973-08-20
DE19732342062 DE2342062A1 (de) 1972-08-21 1973-08-20 Verfahrbare arbeitsbuehne
FR7330286A FR2197397A5 (enrdf_load_stackoverflow) 1972-08-21 1973-08-21

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DE (1) DE2342062A1 (enrdf_load_stackoverflow)
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US4546852A (en) * 1984-02-07 1985-10-15 Fruehauf Corporation Adjustable service platform apparatus for a gantry crane
US4620608A (en) * 1985-10-24 1986-11-04 Builders Equipment And Tool Manufacturing Company Rolling scaffolding base
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US5403607A (en) * 1987-02-17 1995-04-04 American Harvest, Inc. Method for rapidly cooking food
US5466912A (en) * 1993-04-13 1995-11-14 American Harvest, Inc. Convection oven
EP0785168A2 (en) 1996-01-18 1997-07-23 JLG Industries, Inc. Drive system for vertical mast personnel lift
US6039148A (en) * 1998-12-24 2000-03-21 Riegel; James M. Mechanized scaffold
US6044927A (en) * 1998-09-23 2000-04-04 Zefer Operations, Inc. Work platform lift machine with scissor lift mechanism employing telescopable electro-mechanical based lift actuation arrangement
US6050365A (en) * 1997-04-22 2000-04-18 Zefer Operations, Inc. Scissors-type work platform lift machine with electro-mechanical based lift actuation arrangement
US6174124B1 (en) * 1996-10-04 2001-01-16 Crown Equipment Corporation Load trays for personnel carrying vehicles
FR2836465A1 (fr) * 2002-02-28 2003-08-29 Pinguely Haulotte Nacelle elevatrice, et procede d'assemblage au moyen d'une telle nacelle
US6651775B2 (en) * 2000-07-31 2003-11-25 Frederick N. Bassett, Jr. Low level scaffold with ballscrew drive
WO2003074143A3 (de) * 2002-03-05 2003-11-27 Wittenstein Ag Verfahren zum gestalten eines bühnenbildes und bühnenelement
US20030230450A1 (en) * 2002-04-18 2003-12-18 Robert Imberi Self propelled scaffolding
GB2391254A (en) * 2002-07-30 2004-02-04 Emyr Wyn Jones Platform Lift
WO2005068346A1 (en) * 2004-01-10 2005-07-28 Wolfe Designs Limited Access tower
US20060180403A1 (en) * 2005-01-07 2006-08-17 Hanlon Mark T Screw scissor lift
US20070102242A1 (en) * 2005-11-04 2007-05-10 Sky Climber, Llc Powered controlled acceleration suspension work platform hoist system
US20070262567A1 (en) * 2006-05-12 2007-11-15 Dulond Tool & Engineering, Inc. Band cart storage system and method
US20080099282A1 (en) * 2006-10-30 2008-05-01 Caterpillar Inc. Powered access device
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US8434592B1 (en) * 2010-11-09 2013-05-07 Telpro, Inc. Mobile tower drive system
US20130153336A1 (en) * 2011-12-14 2013-06-20 Lili Wu Personnel lift vehicle
US20130186708A1 (en) * 2011-12-14 2013-07-25 Lili Wu Personnel lift vehicle
US8657074B2 (en) 2005-11-04 2014-02-25 Sky Climber, Llc Suspension work platform hoist system with tilt control
US20140053665A1 (en) * 2012-08-22 2014-02-27 Brian Andrew Jutte Vechicle and method for tending to an elevated livestock cage
US20150027808A1 (en) * 2013-07-23 2015-01-29 Paul D. Baillargeon Warning and message delivery and logging system utilizable in a fall arresting and prevention device and method of same
US8944217B2 (en) 2005-11-04 2015-02-03 Sky Climber, Llc Suspension work platform hoist system with communication system
USD730614S1 (en) 2013-11-26 2015-05-26 Big Lift, Llc. Personnel lift vehicle
CN111734102A (zh) * 2020-08-03 2020-10-02 烟台虹月电子商务有限公司 一种适用于脚手架的支撑装置
WO2020205156A1 (en) * 2019-04-05 2020-10-08 Oshkosh Corporation Electric boom
WO2020205164A1 (en) * 2019-04-05 2020-10-08 Oshkosh Corporation Scissor lift descent control systems and methods
WO2020205161A1 (en) * 2019-04-05 2020-10-08 Oshkosh Corporation Fully-electric scissor lift
US10810851B2 (en) 2011-02-09 2020-10-20 Terex SD, Inc. Warning and message delivery and logging system utilizable in the monitoring of fall arresting and prevention devices and method of same
WO2020257492A1 (en) * 2019-06-19 2020-12-24 Oshkosh Corporation Spring systems for lifting aerial work platforms
US20210076557A1 (en) * 2019-09-18 2021-03-18 Cruiser Products, Llc Vehicle for tending to agriculture and related methods
EP3687932A4 (en) * 2017-09-29 2021-06-23 SafeWorks, LLC DC POWERED WINCH SYSTEM
US11045047B2 (en) 2017-11-10 2021-06-29 Ron's Enterprises, Inc. Variable capacity oven
US11065777B2 (en) * 2018-10-17 2021-07-20 Alexander Homsky Slicing machine
CN113479828A (zh) * 2021-07-01 2021-10-08 广州新科宇航科技有限公司 一种用于320飞机维修用的升降装置
USD933715S1 (en) 2020-01-24 2021-10-19 Cruiser Products, Llc Agricultural vehicle with a fixed-height elevated platform
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CN114341049A (zh) * 2019-07-26 2022-04-12 奥克斯工业股份有限公司 用于高空作业平台的电动旋转致动器
US20220314694A1 (en) * 2021-03-31 2022-10-06 Kenneth Bell Easy Wheel Mount
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JPS6426459U (enrdf_load_stackoverflow) * 1987-08-05 1989-02-15
JPH0428988Y2 (enrdf_load_stackoverflow) * 1987-08-06 1992-07-14
JPH027293U (enrdf_load_stackoverflow) * 1988-06-24 1990-01-18
JPH08428Y2 (ja) * 1992-03-31 1996-01-10 高砂熱学工業株式会社 高所作業用昇降足場台
DE19927310C2 (de) 1999-06-15 2002-12-05 Liftlux Potain Gmbh Arbeitsbühne
FR2901295B1 (fr) * 2006-05-17 2009-07-10 Christian Jean Bassani Plate-forme individuelle de travail a relevement et deplacement motorisee
CN105253827A (zh) * 2015-11-03 2016-01-20 太仓联洲机械设备有限公司 一种气动三维升降操作平台

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Cited By (89)

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Publication number Priority date Publication date Assignee Title
US4258825A (en) * 1978-05-18 1981-03-31 Collins Pat L Powered manlift cart
US4546852A (en) * 1984-02-07 1985-10-15 Fruehauf Corporation Adjustable service platform apparatus for a gantry crane
US4620608A (en) * 1985-10-24 1986-11-04 Builders Equipment And Tool Manufacturing Company Rolling scaffolding base
US5165328A (en) * 1987-02-17 1992-11-24 Alternative Pioneering Systems, Inc. Expandable countertop oven
US5403607A (en) * 1987-02-17 1995-04-04 American Harvest, Inc. Method for rapidly cooking food
US5484621A (en) 1987-02-17 1996-01-16 American Harvest, Inc. Method for rapidly cooking food
US5513558A (en) * 1987-02-17 1996-05-07 American Harvest, Inc. Rapid cooking device
US5466912A (en) * 1993-04-13 1995-11-14 American Harvest, Inc. Convection oven
AU715810B2 (en) * 1996-01-18 2000-02-10 Jlg Industries, Inc. Drive system for vertical mast personnel lift
US5740887A (en) * 1996-01-18 1998-04-21 Jlg Industries, Inc. Drive system for vertical mast personnel lift
EP0785168A2 (en) 1996-01-18 1997-07-23 JLG Industries, Inc. Drive system for vertical mast personnel lift
US6174124B1 (en) * 1996-10-04 2001-01-16 Crown Equipment Corporation Load trays for personnel carrying vehicles
US6050365A (en) * 1997-04-22 2000-04-18 Zefer Operations, Inc. Scissors-type work platform lift machine with electro-mechanical based lift actuation arrangement
US6044927A (en) * 1998-09-23 2000-04-04 Zefer Operations, Inc. Work platform lift machine with scissor lift mechanism employing telescopable electro-mechanical based lift actuation arrangement
US6039148A (en) * 1998-12-24 2000-03-21 Riegel; James M. Mechanized scaffold
US6651775B2 (en) * 2000-07-31 2003-11-25 Frederick N. Bassett, Jr. Low level scaffold with ballscrew drive
FR2836465A1 (fr) * 2002-02-28 2003-08-29 Pinguely Haulotte Nacelle elevatrice, et procede d'assemblage au moyen d'une telle nacelle
EP1340708A1 (fr) * 2002-02-28 2003-09-03 Pinguely-Haulotte Nacelle élévatrice, et procédé d'assemblage au moyen d'une telle nacelle
WO2003074143A3 (de) * 2002-03-05 2003-11-27 Wittenstein Ag Verfahren zum gestalten eines bühnenbildes und bühnenelement
US6880672B2 (en) * 2002-04-18 2005-04-19 Robert Imberi Self propelled scaffolding
US20030230450A1 (en) * 2002-04-18 2003-12-18 Robert Imberi Self propelled scaffolding
GB2391254A (en) * 2002-07-30 2004-02-04 Emyr Wyn Jones Platform Lift
US20080105497A1 (en) * 2004-01-10 2008-05-08 Wolfe Designs Limited AccessTower
WO2005068346A1 (en) * 2004-01-10 2005-07-28 Wolfe Designs Limited Access tower
US20060180403A1 (en) * 2005-01-07 2006-08-17 Hanlon Mark T Screw scissor lift
US8657074B2 (en) 2005-11-04 2014-02-25 Sky Climber, Llc Suspension work platform hoist system with tilt control
US10961725B2 (en) 2005-11-04 2021-03-30 Sky Climber, Llc Suspension work platform hoist system
US9982443B2 (en) 2005-11-04 2018-05-29 Sky Climber Llc Suspension work platform hoist system with communication and diagnostic system
US8733509B2 (en) 2005-11-04 2014-05-27 Sky Climber Llc Multiple input voltage hoist system
US7631730B2 (en) * 2005-11-04 2009-12-15 Sky Climber, Llc Powered controlled acceleration suspension work platform hoist system
AU2006312312B2 (en) * 2005-11-04 2011-01-20 Sky Climber Llc Powered controlled acceleration suspension work platform hoist system
US9647596B2 (en) 2005-11-04 2017-05-09 Sky Climber Llc Motor control system having a reactive power reducing input power system
US20070102242A1 (en) * 2005-11-04 2007-05-10 Sky Climber, Llc Powered controlled acceleration suspension work platform hoist system
US8944217B2 (en) 2005-11-04 2015-02-03 Sky Climber, Llc Suspension work platform hoist system with communication system
US8590921B2 (en) * 2006-05-12 2013-11-26 Dulond Tool & Engineering, Inc. Band cart storage system and method
US20070262567A1 (en) * 2006-05-12 2007-11-15 Dulond Tool & Engineering, Inc. Band cart storage system and method
US20080099282A1 (en) * 2006-10-30 2008-05-01 Caterpillar Inc. Powered access device
US8011474B2 (en) 2006-10-30 2011-09-06 Caterpillar Inc. Powered access device
US8257008B2 (en) * 2007-03-19 2012-09-04 Walgreen Co. Warehouse loader
US20080232942A1 (en) * 2007-03-19 2008-09-25 Walgreen Co. Warehouse loader
US8434592B1 (en) * 2010-11-09 2013-05-07 Telpro, Inc. Mobile tower drive system
US12394294B2 (en) 2011-02-09 2025-08-19 O.E.M Controls, Inc. Warning and message delivery and logging system utilizable in the monitoring of fall arresting and prevention devices and method of same
US10810851B2 (en) 2011-02-09 2020-10-20 Terex SD, Inc. Warning and message delivery and logging system utilizable in the monitoring of fall arresting and prevention devices and method of same
US9440830B2 (en) * 2011-12-14 2016-09-13 Big Lift, Llc Personnel lift vehicle
US10214402B2 (en) * 2011-12-14 2019-02-26 Big Lift, Llc Personnel lift vehicle
US11420858B2 (en) * 2011-12-14 2022-08-23 Big Lift, Llc Personnel lift vehicle
US20130186708A1 (en) * 2011-12-14 2013-07-25 Lili Wu Personnel lift vehicle
US20130153336A1 (en) * 2011-12-14 2013-06-20 Lili Wu Personnel lift vehicle
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
US20200187460A1 (en) * 2012-08-22 2020-06-18 Cruiser Products, Llc Vehicle and method of tending to an elevated agriculture
US20140053665A1 (en) * 2012-08-22 2014-02-27 Brian Andrew Jutte Vechicle and method for tending to an elevated livestock cage
US20190092613A1 (en) * 2013-07-23 2019-03-28 O.E.M. Controls, Inc. Warning and message delivery and logging system utilizable in a fall arresting and prevention device and method of same
US10138102B2 (en) * 2013-07-23 2018-11-27 Viki V. Walbridge Warning and message delivery and logging system utilizable in a fall arresting and prevention device and method of same
US20150027808A1 (en) * 2013-07-23 2015-01-29 Paul D. Baillargeon Warning and message delivery and logging system utilizable in a fall arresting and prevention device and method of same
USD730614S1 (en) 2013-11-26 2015-05-26 Big Lift, Llc. Personnel lift vehicle
EP3687932A4 (en) * 2017-09-29 2021-06-23 SafeWorks, LLC DC POWERED WINCH SYSTEM
US11045047B2 (en) 2017-11-10 2021-06-29 Ron's Enterprises, Inc. Variable capacity oven
US11065777B2 (en) * 2018-10-17 2021-07-20 Alexander Homsky Slicing machine
US11820631B2 (en) 2019-04-05 2023-11-21 Oshkosh Corporation Actuator failure detection and scissor lift load sensing systems and methods
US11787679B2 (en) 2019-04-05 2023-10-17 Oshkosh Corporation Scissor lift descent control systems and methods
US12391525B2 (en) 2019-04-05 2025-08-19 Oshkosh Corporation Electric boom
US12391530B2 (en) 2019-04-05 2025-08-19 Oshkosh Corporation Actuator failure detection and scissor lift loadsensing systems and methods
WO2020205161A1 (en) * 2019-04-05 2020-10-08 Oshkosh Corporation Fully-electric scissor lift
US12371312B2 (en) 2019-04-05 2025-07-29 Oshkosh Corporation Scissor lift descent control systems and methods
US12134428B2 (en) * 2019-04-05 2024-11-05 Oshkosh Corporation Lift steering systems and methods
US12054372B2 (en) 2019-04-05 2024-08-06 Oshkosh Corporation Scissor lift with electric actuator
US11148922B2 (en) * 2019-04-05 2021-10-19 Oshkosh Corporation Actuator failure detection systems and methods
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US11492239B2 (en) 2019-04-05 2022-11-08 Oshkosh Corporation Electric boom
CN113939472B (zh) * 2019-04-05 2024-03-19 奥斯克什公司 电动吊杆
CN113924266B (zh) * 2019-04-05 2023-12-15 奥斯克什公司 剪式升降机下降控制系统和方法
US11802031B2 (en) 2019-04-05 2023-10-31 Oshkosh Corporation Electric boom
WO2020205156A1 (en) * 2019-04-05 2020-10-08 Oshkosh Corporation Electric boom
WO2020257492A1 (en) * 2019-06-19 2020-12-24 Oshkosh Corporation Spring systems for lifting aerial work platforms
CN114341049B (zh) * 2019-07-26 2023-10-20 奥克斯工业股份有限公司 用于高空作业平台的电动旋转致动器
CN114341049A (zh) * 2019-07-26 2022-04-12 奥克斯工业股份有限公司 用于高空作业平台的电动旋转致动器
US20210076557A1 (en) * 2019-09-18 2021-03-18 Cruiser Products, Llc Vehicle for tending to agriculture and related methods
USD933716S1 (en) 2020-01-24 2021-10-19 Cruiser Products, Llc Agricultural vehicle with a variable-height elevated platform
USD933715S1 (en) 2020-01-24 2021-10-19 Cruiser Products, Llc Agricultural vehicle with a fixed-height elevated platform
CN111734102B (zh) * 2020-08-03 2020-12-01 泰州市万达轮业制造有限公司 一种适用于脚手架的支撑装置
CN111734102A (zh) * 2020-08-03 2020-10-02 烟台虹月电子商务有限公司 一种适用于脚手架的支撑装置
US20220314694A1 (en) * 2021-03-31 2022-10-06 Kenneth Bell Easy Wheel Mount
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Publication number Publication date
AU5901173A (en) 1975-02-13
IT993736B (it) 1975-09-30
JPS49124801A (enrdf_load_stackoverflow) 1974-11-29
DE2342062A1 (de) 1974-03-07
FR2197397A5 (enrdf_load_stackoverflow) 1974-03-22

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