Extension Patents (Class 182/207)
  • Patent number: 4401185
    Abstract: The system for safety control utilizes an anchoring device including mounting structure at one end for mounting the device removably on a corner fitting of a container by engagement in any one of the several apertures of the corner fitting, and structure at the other end for supporting safety control equipment such as ladders, stages, lights, fire hoses, lifelines, and so forth.
    Type: Grant
    Filed: June 24, 1981
    Date of Patent: August 30, 1983
    Inventor: Vincent G. Grey
  • Patent number: 4376470
    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 foam strip.
    Type: Grant
    Filed: November 7, 1980
    Date of Patent: March 15, 1983
    Assignee: Little Giant Industries, Inc.
    Inventor: Larry J. Ashton
  • Patent number: 4355701
    Abstract: A ladder assembly includes a supporting bracket to pivotally mount one end of a ladder member; the ladder member comprises an elongated support member which suitably comprises a tubular pole, and a plurality of spaced apart rung members extending transversely of the support member to form rung members on opposite sides of the support member; the rung members are suitably tubular with grip sleeves over at least a portion of their outer surface to minimize hand and foot slippage. The ladder assembly may be particularly adapted for a marine vessel, access to hydropoles and escape from high buildings.
    Type: Grant
    Filed: August 18, 1980
    Date of Patent: October 26, 1982
    Inventor: Agnew W. Nicholson
  • Patent number: 4210224
    Abstract: A longitudinally variable ladder with at least two ladder parts which are displaceable relative to one another in their longitudinal direction, one part of which with its two struts forms a guide for the struts of the other part, which latter struts engage between the former struts, and the rungs, which are connected with the outer struts, lie on the front side of these struts, the rungs which are connected with the inner struts lying between the two planes which are defined by the front side and the rear side of these struts. The struts of all ladder parts have the same box profile, and the inner struts are guided between at least those two rungs of the outer struts which lie in the upper end section of these struts, from which upper end section the other ladder part is able to be pulled out, and guide rails, the guide rails being limited to the end section which carries the two rungs and in this end section at least indirectly engage on the rear side of the outer struts.
    Type: Grant
    Filed: January 5, 1979
    Date of Patent: July 1, 1980
    Inventors: Walter Kummerlin, Nikolaus A. Kummerlin
  • Patent number: 4161997
    Abstract: A self-storing step structure for vehicular mounting including a first step section, means for pivotally connecting the first step section to a vehicle for pivotation about a horizontal axis between an operative position and a stored position, an extensible step section slidably engaging said first step section, and means for adjustably interlocking said first step section with said extensible step section at a preselected relative location.
    Type: Grant
    Filed: March 2, 1977
    Date of Patent: July 24, 1979
    Inventor: Thomas W. Norman
  • 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
  • Patent number: 4102433
    Abstract: An extension roof ladder is disclosed having conventional extension ladder sections for use at the side of a building and connected thereto a flexible roof ladder section having a plurality of shorter subsections for use on the near side of a roof and one relatively longer rigid subsection hinged to the top shorter subsection for use on the far side of the roof.
    Type: Grant
    Filed: February 18, 1977
    Date of Patent: July 25, 1978
    Inventor: Leslie Van Valkenburgh
  • Patent number: 4100995
    Abstract: A telescopic set of steps comprises at least two frames, each of which consists of two parallel members forming stringboards, one end of one of the frames being pivoted to a fixed support for pivotal movement about a horizontal axis, and the other frame being slidable along the pivoted frame, means for varying the slope of the set of steps, a plurality of steps pivoted about respective axes parallel to the said horizontal axis and comprising a first group of steps mounted directly on the sliding frame, and a second group of steps, each of which has an axle mounted on a respective pair of supports which are slidable along a pair of slideways formed on respective stringboards of the pivoted frame, slideway extensions extending onto the fixed support to a distance at least equal to the length of the sliding frame, means for maintaining a constant spacing between the pivot axes of the steps, means for maintaining the steps parallel to one another, and means for setting the inclination of at least one step.
    Type: Grant
    Filed: February 14, 1977
    Date of Patent: July 18, 1978
    Inventor: Jacques Pradon
  • Patent number: 3948353
    Abstract: An extension ladder in which the extension part has a plurality of striated cut-out portions along the leaning edge to serve as hooks for hooking onto a gutter or top edge of a sidewall or roof of a building to prevent lateral or vertical sliding. A lining of rubber or similar material is preferably provided in the cut-out portion to provide an anti-skid surface to further prevent lateral sliding.
    Type: Grant
    Filed: March 20, 1974
    Date of Patent: April 6, 1976
    Inventor: John G. Lane
  • Patent number: 3948352
    Abstract: A extension ladder formed of interlocked top and bottom sections has ladder leveler means comprising a pair of sleeve members that slideably encompass the lower end of the bottom section siderails. A short flange on each sleeve member is captivated by a guide member carried on the inside of each lower siderail permitting the sleeve members to be securely retained in operative position on the bottom of the ladder without interference with the free sliding of the ladder top section along the bottom section.
    Type: Grant
    Filed: July 15, 1975
    Date of Patent: April 6, 1976
    Assignee: White Metal Rolling & Stamping Corporation
    Inventors: Clayton E. Larson, Edwin H. Lemp