Pivotally Connected Ladders, Mutually Sustaining Patents (Class 182/104)
  • Patent number: 9663989
    Abstract: Elevated work platforms, as well as associated methods, are provided. In one particular embodiment, an elevated platform apparatus is provided comprising a first rail assembly having a pair of rails coupled with a plurality of rungs, a second rail assembly hingedly coupled with the first rail assembly, a platform configured to rest upon a portion of the first rail assembly and the second rails assembly and a cage associated with the platform. The cage may include at least one bar and at least one gate, the at least one gate being configured to swing in a first direction upon a user stepping on to the platform from the first rail assembly, and then swing back to a closed position after the user is standing on the platform. The at least one gate is also limited from being displaced in a second direction, opposite the first direction, beyond the closed position.
    Type: Grant
    Filed: January 23, 2013
    Date of Patent: May 30, 2017
    Assignee: Wing Enterprises, Inc.
    Inventors: N. Ryan Moss, Darius S. Penrod, Brian Russell, Sean Peterson, Gary Jonas
  • Patent number: 9151115
    Abstract: A stabilized ladder assembly stabilizes a ladder by providing support on both sides of the ladder. The assembly includes a ladder having a first front side rail, a second front side rail, a first support leg, a second support leg and a plurality of rungs coupled to and extending between the first and second front side rails. A pair of support bars is provided. One of the support bars is coupled to and extends between the first front side rail and the first support leg. One of the support bars is coupled to and extends between the second front side rail and the second support leg. A cross member is coupled to and extends between the support bars. A pair of base supports is provided and each is configured to contact a ground surface. Each of the base supports is coupled to and extends downwardly from the cross member.
    Type: Grant
    Filed: February 13, 2014
    Date of Patent: October 6, 2015
    Inventor: Michael Forte, Jr.
  • Patent number: 9097063
    Abstract: A climbing apparatus that rests on a surface includes a flip ladder that can move between a straight configuration and a stepladder configuration. The apparatus includes a tray having a plane attached to the flip ladder that moves with the flip ladder between the straight configuration where the tray plane is essentially parallel with the ladder in a stowed position and a stepladder configuration where the tray plane is essentially parallel with the surface in an open position. A method for climbing includes the steps of moving a flip ladder between a straight configuration and a stepladder configuration. There is the step of moving a tray having a plane attached to the flip ladder from a stowed position where the tray plane is essentially parallel with the ladder to an opened position where the tray plane is essentially parallel with the surface.
    Type: Grant
    Filed: March 8, 2013
    Date of Patent: August 4, 2015
    Assignee: Werner Co.
    Inventor: Thomas W. Parker
  • Publication number: 20150090531
    Abstract: An assembled ladder is formed by coupling a top ladder segment, a plurality of middle ladder segments, and a plurality of bottom ladder segments together. The bottom ladder segments include a ladder body, support frame assemblies, ancillary frames, adjustable support pads, and adjustable coupling members. The support frame assemblies are respectively set at two sides of the ladder body. The ancillary frames are mounted to the support frame assembly. The adjustable support pads are screwed to the ancillary frames. The adjustable coupling members have an end coupled to the support frame assemblies and are partially received in the receiving space. With the adjustable coupling members fixing the support frame assemblies, the ancillary frames are expanded. Through adjustment made with the adjustable support pads, the ladder can be set more stably to achieve safety and convenience of use.
    Type: Application
    Filed: September 27, 2013
    Publication date: April 2, 2015
    Inventor: PI-CHEN YANG
  • Publication number: 20150060201
    Abstract: A self leveling stepladder with a universal hinge joint providing many new advantages that traditional a-frame step ladders are not capable to deliver.
    Type: Application
    Filed: September 4, 2014
    Publication date: March 5, 2015
    Inventor: David J. Hume
  • Patent number: 8651259
    Abstract: A ladder bridge apparatus for use in connecting two ladder sections is disclosed herein. The ladder bridge apparatus, in its simplest form, includes an adjustable center stabilizer bar connecting outer rail bridge assemblies. The rail bridge assemblies are directly connected to the adjacent ladder sections. The ladder bridge apparatus can be utilized in conjunction with a material transport device to transport materials over the rails of a first ladder section and onto and across the ladder bridge apparatus to a second ladder section.
    Type: Grant
    Filed: July 12, 2013
    Date of Patent: February 18, 2014
    Inventor: Berle G. Blehm
  • Publication number: 20130186710
    Abstract: Elevated work platforms, as well as associated methods, are provided. In one particular embodiment, an elevated platform apparatus is provided comprising a first rail assembly having a pair of rails coupled with a plurality of rungs, a second rail assembly hingedly coupled with the first rail assembly, a platform configured to rest upon a portion of the first rail assembly and the second rails assembly and a cage associated with the platform. The cage may include at least one bar and at least one gate, the at least one gate being configured to swing in a first direction upon a user stepping on to the platform from the first rail assembly, and then swing back to a closed position after the user is standing on the platform. The at least one gate is also limited from being displaced in a second direction, opposite the first direction, beyond the closed position.
    Type: Application
    Filed: January 23, 2013
    Publication date: July 25, 2013
    Applicant: WING ENTERPRISES, INCORPORATED
    Inventor: Wing Enterprises, Incorporated
  • Publication number: 20090078503
    Abstract: A collapsible stepladder including a first and a second ladder leg, where the legs are hingedly connected to each other in one end, and each of the ladder legs includes several ladder sections. Each section includes two ladder bars arranged parallelly to each other and interconnected at one end by a rung to form a U-shaped ladder section. Furthermore, each ladder section is telescopically inserted into a lower ladder section to form a collapsible ladder including at least three ladder sections, where the stepladder is provided with release mechanisms on each of the ladder legs that can be operated from the same side of the stepladder.
    Type: Application
    Filed: February 6, 2007
    Publication date: March 26, 2009
    Applicant: TELESTEPS AB
    Inventor: Per-Olof Eriksson
  • Publication number: 20090000867
    Abstract: A ladder made by plastic material includes a first ladder unit which includes two side rails with a plurality of rungs integrally connected between the two side rails. A head step is integrally connected to two respective top ends of the two side rails. The first ladder unit includes an open first side and a closed second side. Each of the rungs includes a latitude rib and altitude ribs connected to an inner periphery of the open first side so as to define a plurality of chambers in the open first side of each rung, and each side rail includes two sidewalls and a plurality of latitude ribs connected between the two sidewalls so as to define chambers separated by the latitude ribs. Each rung has an anti-slip top surface. A second ladder unit can be pivotably connected to the first ladder unit at two respective head steps.
    Type: Application
    Filed: June 27, 2007
    Publication date: January 1, 2009
    Inventor: Chen Lu Wang
  • Publication number: 20080029339
    Abstract: A two-sided step ladder having at least one rung on one side of the ladder at a different height than any of the rungs on the other side of the ladder.
    Type: Application
    Filed: July 31, 2007
    Publication date: February 7, 2008
    Inventor: Edward H. Yewer
  • Patent number: 6913114
    Abstract: A roof ridge anchor assembly for attaching to and securing a ladder to the roof ridge of a building. One embodiment consists of a pair of devices attached to the rungs of a ladder to allow a ladder to be rolled up onto a roof, turned over and secured in position over the roof bridge.
    Type: Grant
    Filed: June 19, 2004
    Date of Patent: July 5, 2005
    Inventor: Berle G. Blehm
  • Patent number: 6474663
    Abstract: What is disclosed is a combined pair of ladders and transportation dolly device. The device includes a first framework having a first and a second end and a second framework having a first and a second extremity. The first extremity of the second framework is pivotally secured to the first end of the first framework about a first pivotal axis. A loading platform is provided for supporting a load. The platform has a first and a second edge. The platform is pivotally secured to the second end of the first framework about a second pivotal axis, the second axis being disposed between the first and the second edges of the platform. A tie bar has a first and second termination with the first termination being pivotally secured to the second edge of the platform about a third pivotal axis. The second termination of the platform is pivotally secured to the second framework about a fourth pivotal axis. The fourth pivotal axis is disposed between the first and the second extremities of the second framework.
    Type: Grant
    Filed: July 7, 2000
    Date of Patent: November 5, 2002
    Inventor: Jimmy J. Becker
  • Patent number: 6443261
    Abstract: A step stool includes a frame including a front leg and a rear leg movable relative to the front leg and a leg lock coupled to the frame and arranged to retain the rear leg in a fixed position relative to the front leg upon movement of the rear leg to an opened use position lying at an angle to the front leg. The leg lock includes a button receiver coupled to the front leg and a button supported for movement on the rear leg from a released position arranged to disengage the button receiver to allow relative movement of the front and rear legs and a locked position engaged to the button receiver to retain the rear leg in the fixed position.
    Type: Grant
    Filed: August 11, 2000
    Date of Patent: September 3, 2002
    Assignee: Cosco Management, Inc.
    Inventors: William R. Gibson, Enrique R. Giner
  • Patent number: 6079072
    Abstract: A frame assembly supports a work surface of either flexible material or of sections of foldable and unfoldable relatively rigid material all so that the frame assembly and material may either be unfoldable and rigidized or folded into a compact package. The flexible frame assembly includes a pair of spaced poles and a number of hinged sections aligned so that the poles and material can be folded in sections. The poles rotate to permit either a frame folded disposition or a frame rigidized disposition. Embodiments include stretchers, screens and enclosures. The rigid material assembly provides a collapsible and rigidizable space spanning structure formed with a number of hinged sections of center supports and plates hingedly connected together to be either folded into a relatively compact device or unfolded and hingedly positioned to form rigidized space spanning structures.
    Type: Grant
    Filed: June 1, 1995
    Date of Patent: June 27, 2000
    Assignee: Philip Furgang
    Inventor: Elli Katsiri
  • Patent number: 5722507
    Abstract: A platform stool is provided including a frame having a front leg and a rear leg. The front leg is pivotably coupled to the rear leg for movement about a leg pivot axis between an opened position and a closed position. The platform stool includes a multi-part platform including a front section pivotably coupled to the front leg and a rear section pivotably coupled to the rear leg, each of the front and rear sections having a top surface. A platform support linkage couples the front section to the rear section for movement about a platform pivot axis between a platform-forming position wherein the top surface of the front section and the top surface of the rear section are aligned in substantially coplanar relation to form a platform and a platform-collapsing position wherein the top surface of the front section faces away from the rear leg and the top surface of the rear section faces away from the front leg.
    Type: Grant
    Filed: January 11, 1996
    Date of Patent: March 3, 1998
    Assignee: Cosco, Inc.
    Inventor: James M. Kain
  • Patent number: 5715909
    Abstract: A stepladder is provided with a bracing shelf that acts both as a conventional pivoting shelf and a bracing mechanism preventing accidental closing of the stepladder when the shelf is in a bracing position. The shelf includes abutting members adapted to contact a step of the stepladder, and, optionally, a mechanism to lock the shelf in the bracing position.
    Type: Grant
    Filed: November 20, 1995
    Date of Patent: February 10, 1998
    Inventor: Gilles Gagnon
  • Patent number: 5685391
    Abstract: A connecting device (10) is adaptable to assemble one, two or three ladders (72, 74, 76) into a tripod structure. A body (12) of the connecting device has six rung receivers (28) affixed thereto and outwardly projecting therefrom in pairs, with each pair of receivers projecting at an angle to the other pairs and at an angle to the vertical. Where three ladders are not available, support members (140, 160) may be employed to form one or two of the tripod legs.
    Type: Grant
    Filed: May 30, 1996
    Date of Patent: November 11, 1997
    Inventor: James Gundlach
  • Patent number: 5577574
    Abstract: An adjustable stepladder comprising a front and rear leg assembly, each having a pair of parallel legs with coupling apertures at their upper ends and elastomeric stoppers at their lower ends, the leg assembly having a plurality of steps extending transversely between the legs with ends coupled to the legs at intermediate points along their lengths, each of the steps being fabricated with an elastomeric coating upon their upper surface, each of the legs being fabricated of a plurality of components with apertures and with the components coupled together in telescoping relationship with a locking pin positionable through alignable apertures in the areas of overlap and a spring interior thereof to hold the locking pin in a preset orientation, the areas of separation being provided beneath the lowermost step, above the uppermost step, and at regions between the steps; a coupling plate having a planar upper surface with an elastomeric sheet thereover with downwardly extending plates with apertures, the apertures
    Type: Grant
    Filed: November 15, 1994
    Date of Patent: November 26, 1996
    Inventor: Michael E. Joseph
  • Patent number: 4934485
    Abstract: A combination foldable ladder and hand truck is disclosed comprising a plurality of ladder sections joined at respective ends by hinges and having retractable transport wheels and a retractable support means. The device is functional as a step ladder as well as an extension ladder in an open position with the support means and transport wheels each in their retracted positions. The device is functional as a hand truck in a closed position with the support means in an extended forward position for supporting goods and the transport wheels in an extended downward position, for rolling.
    Type: Grant
    Filed: February 8, 1988
    Date of Patent: June 19, 1990
    Assignees: Robert Pease, Kenneth Feeser
    Inventor: Emerson J. Purkapile
  • Patent number: 4907675
    Abstract: This modular constructional element (14), which is of the type comprising at least two uprights between which at least one crosspiece extends, is such that each end of the uprights is screw-threaded and adapted to cooperate with a fixing ring (18, 19) for fixing the element (14) to an adjacent means (15).
    Type: Grant
    Filed: June 10, 1988
    Date of Patent: March 13, 1990
    Inventors: Gerard Saby, Frederic Lemercier
  • Patent number: 4834216
    Abstract: Foldable ladder structure and method of making the same wherein plastic material is injected and expanded in molds to form several parts of a foldable ladder which includes front and rear ladder sections that can be pivotally hinged at their upper portions, a collapsible shelf and spreader linkage to allow the sections to be relatively pivoted from collapsed face-to-face relation to erected position.
    Type: Grant
    Filed: January 15, 1987
    Date of Patent: May 30, 1989
    Assignee: Emerson Electric Co.
    Inventors: Claude R. Wallick, Jr., Thomas J. Schmitt
  • Patent number: 4478549
    Abstract: Foldable ramp for on and off loading all terrain/recreational vehicles from the rear of trucks, trailers, and vans. The ramp folds longitudinally to a width smaller than the wheelbase of the all terrain/recreational vehicles. When folded it may be slipped between the wheels of the all terrain/recreational vehicle for storage on the bed of the truck, trailer or van. When operational the ramp is engaged against the rear of the truck, trailer or van and allows the operator of the all terrain/recreational vehicle to either ride or push the vehicle onto or off of the truck, trailer, or van.
    Type: Grant
    Filed: May 20, 1983
    Date of Patent: October 23, 1984
    Inventors: Curtis Stelly, Elmer J. Arnaud
  • Patent number: 4371055
    Abstract: A combination step and extension ladder manufactured of composite material such as fiberglass is disclosed. The inner and outer side rails are molded fiberglass so that the fibers are angularly oriented with respect to the longitudinal axis of the respective side rail. Hinges are provided on each of the inner side rails of the ladder so that the ladder may be folded and unfolded from a step ladder configuration to a straight extension ladder configuration and vice versa. The inner side rails are telescopically mounted within channeled outer side rails so that the inner side rails can be extended to increase the height of the ladder in either configuration. The outer side rails have a foam strip molded into one side such that the ladder rungs between the outer side rails are supported by both the fiberglass and the foamstrip.
    Type: Grant
    Filed: November 7, 1980
    Date of Patent: February 1, 1983
    Assignee: Little Giant Industries, Inc.
    Inventors: Larry J. Ashton, Ronald R. Grimes
  • Patent number: 4295544
    Abstract: A stepladder comprises a pair of front legs pivotally attached to a forward platform and a pair of rear legs pivotally attached to a rear platform. The front platform and rear platform are hingedly attached to one another for movement between a coplanar position and a folded position. The front legs are releasably locked in a position perpendicular to the front platform. The rear legs are releasably locked to said rear platform at an angle of about 110.degree.. A support member is pivotally attached to the front legs to extend perpendicularly upwardly from the front platform.
    Type: Grant
    Filed: May 1, 1980
    Date of Patent: October 20, 1981
    Inventor: Donald J. Peterson
  • Patent number: 4244444
    Abstract: A walking stepladder has a pair of substantially identical ladder sides, relatively hinged at the top, each side having step rungs for ascent or descent of the ladder from either side. In walking the ladder, the user straddles the ladder top with his legs supported by opposed rungs at each side of the ladder, and shifts his body weight from side to side while concurrently retracting and extending the ladder sides to effect stepwise ladder movement to one side or the other. Releasable means is provided for limiting inward or retracting movement of the relatively hinged ladder sides to prevent ladder instability or collapsing while being walked.
    Type: Grant
    Filed: October 15, 1979
    Date of Patent: January 13, 1981
    Inventor: Giovanni N. Quaggiotto
  • Patent number: 4216844
    Abstract: A fitting for a joint for two ladder sections, which in all angle positions is adapted to lock automatically. This fitting includes a first and a second fitting part which are respectively connectable to the ends of two side pieces of a ladder section and are pivotable about a common axis. The first fitting part has associated therewith a locking unit or element movable parallel to the axis of the joint against the thrust of a return spring from a locking position into an unlocking position and vice versa, while in the second fitting part for each selectable angle position there is provided a bore for receiving the locking unit in its locking position. The locking unit is held by means of a locking mechanism first in its locked position and subsequently, after one fitting part has pivoted relative to the other fitting part, is held by arc sections between the bores of the second fitting part in its unlocked position.
    Type: Grant
    Filed: July 20, 1978
    Date of Patent: August 12, 1980
    Assignee: Zarges Leichtbau GmbH
    Inventor: Ulrich Klafs
  • Patent number: 4157742
    Abstract: Accommodation ladder having a first flight of steps of adjustable length with one end adapted for connection to a ship while its opposite end is pivotably mounted about a horizontal axis at a given level above the quayside. This flight of steps is also mounted for pivotal movement about a vertical axis passing between its opposite ends at a location substantially spaced from its horizontal pivotal axis. A second flight of steps is adapted for mounting at one end adjacent the quayside to pivot about the vertical axis and extends upwardly from this mounting to interconnect with the first flight of steps enabling joint pivoting with the latter about this axis.
    Type: Grant
    Filed: July 10, 1978
    Date of Patent: June 12, 1979
    Assignee: Marine Aluminum Aanensen & Co. A/S
    Inventor: Oscar Aanensen