Hollow Rung Patents (Class 182/228.6)
  • Patent number: 9555461
    Abstract: A method for connecting two components. The method includes heating a deformation region of at least one component part to provide complete heating. The at least one component part is plastically deformed after the complete heating of the deformation region.
    Type: Grant
    Filed: June 20, 2013
    Date of Patent: January 31, 2017
    Inventors: Andreas Dannheisig, Michael Hamers, Ludger M├╝hlenbrock, Volker Schmidt
  • Patent number: 8869939
    Abstract: An extension ladder comprises a plurality of ladder sections, connection kits and transverse step beams. Each ladder section is a hollow rail, which can be interconnected by telescoping with each other. A snap-fit mechanism is provided between the upper ladder section and the lower ladder section to make them not slip when the ladder is extended. The upper end of each ladder section is provided with a connection kit. The upper end of the connection kit is provided with a fixed protuberant pin, an inside thereof is provided with a locking mechanism which is provided with a turning key. An outside of the connection kit is covered by the transverse step beam. When the upper and lower connection kits are close to each other, the protuberant pin of the lower connection kit pushes the turning key so that the locking mechanism of the upper connection kit can be unlocked.
    Type: Grant
    Filed: September 25, 2008
    Date of Patent: October 28, 2014
    Inventors: Ching Yao Kuo, Norman William Liefke
  • Patent number: 8807281
    Abstract: A ladder rung plug is provided for preventing insect infestation of open ended ladder rungs, providing additional storage space, and selectively supporting items from the ladder. The plug assembly includes a ladder having a rung with an open end. A plug is provided having a first end, a second end, and a peripheral edge extending between the first end and the second end. The first end is insertable into the open end of the rung. Thus, the open end may be sealed by the plug. In an embodiment, a wall extends from the first end of the plug forming a storage compartment with an opening through the plug. A cap is selectively couplable to the plug to close the storage compartment.
    Type: Grant
    Filed: April 18, 2011
    Date of Patent: August 19, 2014
    Inventor: Lowell F. Hoffman
  • Patent number: 8668049
    Abstract: A ladder comprises two stiles and at least a step unit mounted between the two stiles. The step unit includes a hollow step, an inner sleeve and an outer sleeve. The inner sleeve is fit into the hollow step, at an end of which a position restriction portion is located to prevent the inner sleeve from moving out, and the outer sleeve is adapted to surround the end of the hollow step. Besides, a fastener is set, the fastening end of which is passed through the stile, the outer sleeve and fastened in the inner sleeve. The present technique solution has a high supporting strength and a high shear resistance.
    Type: Grant
    Filed: December 29, 2008
    Date of Patent: March 11, 2014
    Assignee: New-Tec Integration (Xiamen) Co., Ltd.
    Inventor: Luhao Leng
  • Patent number: 8622175
    Abstract: A ladder having several collapsible ladder sections (100), each comprising two hollow ladder bars (102, 103) arranged parallel to each other and interconnected by a rung (104), where each collapsible ladder section is telescopically inserted into a lower ladder section. Each ladder bar of a collapsible ladder section has a locking hole (111) and an extension (112) below the locking hole. Retaining mechanisms (106) are provided in the rungs for locking the collapsible ladder sections relative to one another, and the retaining mechanisms comprise a locking pin (108), which can engage a corresponding locking hole provided in the ladder bar of a ladder section positioned there above. At least part of the collapsible ladder sections have a non-locking slot or groove (101) formed in the extensions of the ladder bars, where the slot reaches from a distance below the ladder bar to the bottom of the ladder bar.
    Type: Grant
    Filed: November 20, 2009
    Date of Patent: January 7, 2014
    Assignee: Patentselskabet af 10. december 2010 ApS
    Inventor: Otto Martinus Nielsen
  • Patent number: 8225906
    Abstract: An extendable/retractable ladder assembly includes a first stile and a second stile and a plurality of rungs extending therebetween. Each stile may comprise a plurality of columns disposed in a nested arrangement for relative axial movement in a telescopic fashion. A connector assembly connects the rungs to respective columns in the first and second stiles. The ladder has improved manufacturability since connector assemblies may be assembled before connecting the rungs to respective columns. The standing surface of the rungs may be angled such that it is rotated towards horizontal when the ladder assembly is leaned against a wall. A latch assembly may be used to selectively lock relative axial movement between adjacent columns. The latch assembly includes a locking pin assembly comprised of a central post and an outer metal sleeve. An air damper may also be used to control airflow through the columns.
    Type: Grant
    Filed: August 22, 2008
    Date of Patent: July 24, 2012
    Assignee: Core Distribution, Inc.
    Inventors: Mitchell I. Kieffer, Allen A. Caldwell, Nathan L. Schlueter, Matthew J. Decker
  • Patent number: 8152187
    Abstract: A roll formed step rail for a vehicle comprises an elongated rail body having two opposing edges which define a longitudinal channel. The channel receives a pinch clamp which is wider than the channel and has a fastening hole and an alignment means. The rail body is lowered onto the mounting surface of a mounting bracket adapted for rigid connection to a vehicle. The mounting surface defines another fastening hole and another portion of the alignment means. A fastener draws the pinch clamp and the mounting surface toward opposite sides of the opposing edges of the rail body. Because the pinch clamp spans the width of the channel and is aligned properly relative to the mounting surface, the rail body is secured between the clamp and the mounting surface by the tightened fastener.
    Type: Grant
    Filed: May 23, 2011
    Date of Patent: April 10, 2012
    Assignee: Iron Cross Automotive, Inc.
    Inventor: Robert T. Crandall
  • Patent number: 8011475
    Abstract: An extension ladder, including multiple ladder sections, each including a pair of pin holes, a pair of columns, and a rung, including a pair of pins, a pair of springs, a gear, a pair of gear racks, and a pair of mounting rings, wherein the columns of adjacent ladder sections are fit with each other, diameters of the columns of the ladder sections increase from the top to the bottom, the pin holes are disposed on the columns, and operate to receive the pins, the pins are coaxial, the gear is disposed on a side wall of the rung and engaged with the gear rack, one end surface of the gear sticks out from the side wall of the rung, a key hole is disposed on the end surface of the gear, the mounting ring operates to fix the pin, and the spring is contacted with the pin.
    Type: Grant
    Filed: November 23, 2009
    Date of Patent: September 6, 2011
    Assignee: Tianjin Kelin Mold Technic Co., Ltd.
    Inventor: Kecheng Wang
  • Patent number: 7201255
    Abstract: A ladder structure for enhancing corrosion resistance is disclosed, which comprises a ladder including a pair of rails and a plurality of rungs extending between and mounted on the rails. At least one of the rails and at least one of the rungs of the ladder comprise substantially tubular elements each having an interior. A pair of the substantially tubular elements of the ladder are connected to each other and the interiors of the connected pair of substantially tubular elements are in fluid communication with each other. Also disclosed is a method of forming the ladder structure with enhanced corrosion resistance.
    Type: Grant
    Filed: January 23, 2004
    Date of Patent: April 10, 2007
    Inventor: Robert D. Kreikemeier
  • Patent number: 6591942
    Abstract: A process for manufacturing ladders comprises the following steps: arranging a plurality of rungs (2) of a material comprising a plurality of reinforcing fibers (2a) associated with a binding resin (2b) and each having at least one coupling portion (2c); arranging at least one primary upright length (3), preferably of a material comprising a plurality of reinforcing fibers (3a) associated with a binding resin (3b); mechanically linking the coupling portions (2c) of the rungs (2) to corresponding engagement regions (3c) of the primary upright length (3). The linking step involves bringing at least one of the binding resins (2b, 3b) to the fluid phase at least close to the engagement regions (3c) and/or the coupling portions (2c). The binding resins (2b, 3b) are thermoplastic polymeric materials and the step of bringing the binding resins (2b, 3b) to the fluid phase takes place by melting of the binding resins (2b, 3b).
    Type: Grant
    Filed: April 27, 2001
    Date of Patent: July 15, 2003
    Assignee: Top Glass S.p.A.
    Inventor: Alfonso Branca
  • Publication number: 20010017233
    Abstract: A ladder made of composite material comprises a plurality of rungs having an elongated body (19) provided with at least one connecting portion (3) adapted to engage an upright (4) of a ladder. Engagement means (5) locks the rung (2) to the upright (4); this means comprises a coupling element (6) made by co-moulding on the connecting portion (3) of the elongated body (19) or, alternatively, on the connecting seating (20) of the upright (4), a mechanical fastener (9) operatively acting in an installation housing (8) of the coupling element (6) and a locking element (10) adapted to prevent disengagement of the mechanical fastener (9).
    Type: Application
    Filed: February 22, 2001
    Publication date: August 30, 2001
    Applicant: GENEX S.r.I
    Inventor: Luca Panzeri
  • Patent number: 6220389
    Abstract: The pull-out sections of folding ladders must be locked on the guiding elements pertaining thereto for ladder use and should also be easily unlocked. A locking bolt used to fix the elements can be axially and manually moved inside a guide element against an adjustment spring to engage a hollow profile section of a rung on the pull-out sections. A lockable guide element with a bayonet fitting is included on the ladder element to enable easy locking and unlocking.
    Type: Grant
    Filed: August 2, 1999
    Date of Patent: April 24, 2001
    Assignee: Krause-Werk GmbH & Co. KG
    Inventor: Guenther Krause