Slidable Nested Single Rung Units Patents (Class 182/195)
  • Patent number: 9302719
    Abstract: An integrated stepgate and handle assembly includes a tailgate, a displaceable ladder carried on the tailgate, a displaceable handle carried on the tailgate and a latch. The latch connects the ladder and the handle whereby the handle is partially deployed with the ladder. This partial deployment of the handle prompts the operator to fully deploy and use the handle.
    Type: Grant
    Filed: October 10, 2014
    Date of Patent: April 5, 2016
    Assignee: Ford Global Technologies, LLC
    Inventors: Venkatesh Krishnan, Ravikumar Ranganathan, Brandon Buckhalt, Thomas M. Herline
  • Patent number: 8939256
    Abstract: There is provided a collapsible ladder having several collapsible ladder sections, where each or at least part of the ladder sections comprises two hollow ladder bars arranged parallel to each other and interconnected at an upper end by a rung, and 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 adjacent the lower end part of the ladder bar and an extension below the locking hole, and retaining mechanisms are provided in at least part of the rungs for locking the collapsible ladder sections relative to one another when the collapsible ladder sections are extended. Each of or part of the retaining mechanisms comprises a locking pin, which can be brought into an extended and locked position in order to engage a corresponding locking hole provided in the ladder bar of a ladder section positioned there above, and a release part for bringing the locking pin into a retracted and un-locked position.
    Type: Grant
    Filed: January 30, 2012
    Date of Patent: January 27, 2015
    Assignee: Patentselskabet af 10. december 2010 ApS
    Inventor: Otto Martinus Nielsen
  • 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: 8807278
    Abstract: A hunting stand apparatus includes a pair of posts each having a bottom end and a top end. Each of the posts is telescoping and includes a same number of a plurality of tubular members such that sets of tubular members are defined. Each of a plurality of rungs is attached to and extending between tubular members of each set. A plurality of locking members is provided for locking the sets in an extended position. A seat has a front edge pivotally coupled to an upper most one of the rungs. A pair of brackets is also provided. Brackets are attached to each of the posts. Each of a pair of supports is removably attached to and extends between one of the brackets and a back edge of the seat such that the seat is angled with respect to the posts.
    Type: Grant
    Filed: September 24, 2011
    Date of Patent: August 19, 2014
    Inventors: Kevin S. Galloway, David E. Johnson
  • Publication number: 20140190766
    Abstract: An access ladder includes a plurality of sections connected together to telescope between an extended position and a retracted position that has an increasing reactive force to counterbalance the weight of the sections as they extend. A method for accessing a room with a ladder connected to a ceiling including the steps of moving the ladder to a fully extended position subject to an increasingly active force to counterbalance the weight of the ladder as it extends. There is the step of retracting the ladder into a retracted position in the ceiling.
    Type: Application
    Filed: January 7, 2013
    Publication date: July 10, 2014
    Inventor: Thomas W. Parker
  • Patent number: 8708102
    Abstract: A ladder constructed for reaching an elevated surface or object and having a bow-shaped configuration so that the reach may extend further from the base on which the footing of the ladder rests, the ladder being configured to reach areas such as the roof of a vehicle.
    Type: Grant
    Filed: June 14, 2012
    Date of Patent: April 29, 2014
    Inventor: Larry Mickens
  • Patent number: 8695760
    Abstract: An attic ladder system includes an upper portion that can be extended above the attic floor and a lower portion that can be extended into a room below the attic. The upper portion can extend automatically into the attic upon extension of the lower portion, or may be operated independently of the lower section. Ladder extension can be telescopic or by unfolding of sections. Retraction of either or both ladder portions may include a pivoting capability to reduce vertical height when stored. A gap can be provided between lowest the rungs to avoid danger to a user's hands. Embodiments can be used to access the top of a vehicle roof from within the vehicle. Embodiments can support a user weighing up to 300 pounds. A gas spring can assist in lifting and stowing the lower portion. Pivot latches can secure the ladder in its stowed and deployed configurations.
    Type: Grant
    Filed: January 27, 2012
    Date of Patent: April 15, 2014
    Assignee: Appropriate Combined Technologies, LLC
    Inventor: Amos G Winter, IV
  • 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: 8387753
    Abstract: An extendable/retractable ladder assembly includes a first column and a second column, the first column nesting in the second column, and a first rung coupled to, and extending from the second column. A ladder assembly bracket includes a collar portion, which extends about the second column, and a rung portion, which extends from the collar portion into the first rung. The collar portion may be gripped by a hand of an operator in order to position a thumb of the hand in engagement with a button to retract a locking pin of a latch assembly mounted within the rung portion of the bracket.
    Type: Grant
    Filed: June 30, 2006
    Date of Patent: March 5, 2013
    Assignee: Core Distribution, Inc.
    Inventors: Mitchell I. Kieffer, Craig S. Aizman, Bruce A. Hillukka, Michael J. Kelly, Wayne A. Shakal
  • Patent number: 8348015
    Abstract: An access ladder includes a plurality of sections connected together to telescope between an extended position and a retracted position that has an increasing reactive force to counterbalance the weight of the sections as they extend. A method for accessing a room with a ladder connected to a ceiling including the steps of moving the ladder to a fully extended position subject to an increasingly active force to counterbalance the weight of the ladder as it extends. There is the step of retracting the ladder into a retracted position in the ceiling.
    Type: Grant
    Filed: June 14, 2011
    Date of Patent: January 8, 2013
    Assignee: Werner Co.
    Inventor: Thomas W. Parker
  • 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: 8215453
    Abstract: A ladder constructed for reaching an elevated surface or object and having a bow-shaped configuration so that the reach may extend further from the base on which the footing of the ladder rests, the ladder being configured to reach areas such as the roof of a vehicle.
    Type: Grant
    Filed: April 8, 2009
    Date of Patent: July 10, 2012
    Inventor: Larry Mickens
  • Patent number: 8104580
    Abstract: A locking mechanism for a collapsible ladder (1) comprising several ladder sections (5), each ladder section comprising two ladder bars (2, 3) arranged parallel to each other and interconnected at one end by a rung to form a U-shaped ladder section, and where each ladder section (5) is telescopically inserted into a lower ladder section to form a collapsible ladder (1), and where dampers (23) are provided at the lower end of the ladder bars (2, 3, and where the locking mechanism comprises retaining mechanisms (20, 41) provided on each ladder bar (2, 3), where a single pair of actuators of the locking mechanism can be arranged on any of the ladder sections (5) and still be able to collapse the entire ladder (1).
    Type: Grant
    Filed: May 29, 2006
    Date of Patent: January 31, 2012
    Assignee: Telesteps AB
    Inventor: Per-Olof Eriksson
  • Patent number: 8074767
    Abstract: An extensible, vehicle-mounted ladder with movable rungs is used to aid in raising and lowering in rescue operations. The ladder includes a rotatable base having storage space to hold extra rungs supporting the variable extended positions of the ladder. The ladder includes a plurality of ladder units or extensible booms. Each ladder unit includes four C-rails. A first ladder unit is attached to the rotatable base and the others extensible therefrom. The ladder includes rungs that slidably engage within two of the C-rails. A drive cable connects the rungs in a closed loop and is powered to enable rung rotation in a closed loop around the ladder units within the C-rails.
    Type: Grant
    Filed: August 8, 2010
    Date of Patent: December 13, 2011
    Inventor: Orville Douglas Denison
  • Patent number: 8074771
    Abstract: Safety ladders to provide egress from water to a dock or boat or the like are disclosed. Safety ladders in accordance with the present invention are mountable to a structure, upwardly collapsible to a first storage configuration, and downwardly extendible to a second climbing configuration.
    Type: Grant
    Filed: January 25, 2007
    Date of Patent: December 13, 2011
    Inventor: David A. Nickelson
  • Patent number: 8066099
    Abstract: The present invention discloses a retractable ladder which is a common climbing tool in daily life and engineering industry. The retractable ladder comprises a pedal operated unlock device, section-positioning lock devices and an accidental operation preventing device. The main components of the unlock device is disposed in the first ladder section and enclosure caps at upper ends of each ladder section, except for the uppermost ladder section, are provided with the lock devices and unlock nose spikes. The retractable ladder is changed from an extended state to a folded state simply by operating the unlock device with foot of the user so as to release the lock of the ladder. Consequently, the retractable ladder will automatically retract to descend all of the ladder sections from top to bottom in turn. When the ladder is changed from the folded state to the extended state, section-positioning pins are pulled out downwardly from the uppermost ladder section so as to lock the ladder sections.
    Type: Grant
    Filed: September 2, 2009
    Date of Patent: November 29, 2011
    Inventor: Yaoguang Liang
  • Patent number: 8056679
    Abstract: A retractable ladder includes telescoping rail sections each having left and right side rail members. Each side rail member has two aligned locking holes. A control device includes a shaft disposed rotatably between the side rail members of one of the rail sections, and two locking units each having a controlled piece fixed to and rotatable along with the shaft, two abutment plates, two locking pins, and two spring members biasing the abutment plates to abut respectively against two opposite sides of the controlled piece. The controlled piece is rotatable between a pushing position to push the locking pins to project outwardly from the locking holes in said one of the rail sections and engage respectively the locking holes in the adjacent rail section, and a non-pushing position, where the locking pins are permitted to extend inwardly so as to disengage from the locking holes in the adjacent rail section.
    Type: Grant
    Filed: August 11, 2009
    Date of Patent: November 15, 2011
    Inventor: Rong-Tai Hong
  • Publication number: 20110247897
    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: Application
    Filed: November 20, 2009
    Publication date: October 13, 2011
    Inventor: Otto Martinus Nielsen
  • Publication number: 20110240405
    Abstract: An access ladder includes a plurality of sections connected together to telescope between an extended position and a retracted position that has an increasing reactive force to counterbalance the weight of the sections as they extend. A method for accessing a room with a ladder connected to a ceiling including the steps of moving the ladder to a fully extended position subject to an increasingly active force to counterbalance the weight of the ladder as it extends. There is the step of retracting the ladder into a retracted position in the ceiling.
    Type: Application
    Filed: June 14, 2011
    Publication date: October 6, 2011
    Inventor: Thomas W. Parker
  • Patent number: 8028805
    Abstract: An access ladder for accessing a ceiling from a floor. The ladder comprises a plurality of sections which telescope open and closed, and from a bottom section each section telescopes open to positively lock to the section below it with plungers that lock and unlock each section in sequence as the sections open and close, respectively. A method for using an access ladder for accessing a ceiling from a floor.
    Type: Grant
    Filed: June 10, 2010
    Date of Patent: October 4, 2011
    Assignee: Werner Co.
    Inventor: Thomas W. Parker
  • 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
  • Publication number: 20110192679
    Abstract: An extension ladder (1) comprises a plurality of ladder sections (2), connection kits (3) and transverse step beams (5). Each ladder section is a hollow rail having different caliber, 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 extension ladder is extended. The upper end of each ladder section is provided with a connection kit transverse provided. The upper end of the connection kit is provided with a fixed protuberant pin (300), an inside thereof is provided with a locking mechanism (4b). The locking mechanism (4b) is provided with a turning key (440). An outside of the connection kit is covered by the transverse step beam.
    Type: Application
    Filed: September 25, 2008
    Publication date: August 11, 2011
    Inventors: Chingyao Kuo, Norman William Liefke
  • Patent number: 7967110
    Abstract: An access ladder includes a plurality of sections connected together to telescope between an extended position and a retracted position that has an increasing reactive force to counterbalance the weight of the sections as they extend. A method for accessing a room with a ladder connected to a ceiling including the steps of moving the ladder to a fully extended position subject to an increasingly active force to counterbalance the weight of the ladder as it extends. There is the step of retracting the ladder into a retracted position in the ceiling.
    Type: Grant
    Filed: July 27, 2006
    Date of Patent: June 28, 2011
    Assignee: Werner Co.
    Inventor: Thomas W. Parker
  • Publication number: 20100307870
    Abstract: A telescopic ladder having two mutually adjacent side rails and rungs disposed between the side rails, wherein the side rails include a plurality of substantially tubular, telescoping side rail portions and mutually adjacent side rail portions connected to one another by a rung wherein the side rail portions have a locking unit with which the side rail portions can be locked against the respectively next lower side rail portion in the extended setting.
    Type: Application
    Filed: June 4, 2010
    Publication date: December 9, 2010
    Inventor: Dirk Zimmerman
  • Publication number: 20100270106
    Abstract: A ladder is composed of a plurality of rung units and each unit includes two hollow tubes and a rung connected between the two hollow tubes. The hollow tubes of the rung units have gradually reduced outer diameters so that the hollow tubes can be telescopically received to form a compact size. The rung is connected to the two hollow tubes of each rung unit by two connectors and each connector includes two buttons which can be pushed in the direction perpendicular to the axis of the rung to release the interlock connection between the rung and the hollow tubes so as to easily collapse or extend the ladder.
    Type: Application
    Filed: March 24, 2010
    Publication date: October 28, 2010
    Inventor: MEI-HUA CHEN
  • Publication number: 20100258379
    Abstract: A ladder constructed for reaching an elevated surface or object and having a bow-shaped configuration so that the reach may extend further from the base on which the footing of the ladder rests, the ladder being configured to reach areas such as the roof of a vehicle.
    Type: Application
    Filed: April 8, 2009
    Publication date: October 14, 2010
    Inventor: Larry Mickens
  • Patent number: 7748498
    Abstract: An access ladder for accessing a ceiling from a floor. The ladder comprises a plurality of sections which telescope open and closed, and from a bottom section each section telescopes open to positively lock to the section below it with plungers that lock and unlock each section in sequence as the sections open and close, respectively.
    Type: Grant
    Filed: October 19, 2005
    Date of Patent: July 6, 2010
    Assignee: Werner Co.
    Inventor: Thomas W. Parker
  • Publication number: 20100133041
    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: Application
    Filed: November 23, 2009
    Publication date: June 3, 2010
    Inventor: Kecheng WANG
  • Publication number: 20100044155
    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: Application
    Filed: August 22, 2008
    Publication date: February 25, 2010
    Applicant: CORE DISTRIBUTION, INC.
    Inventors: Mitchell I. Kieffer, Allen A. Caldwell, Nathan L. Schlueter, Matthew J. Decker
  • Publication number: 20090050407
    Abstract: A locking mechanism for a collapsible ladder (1) comprising several ladder sections (5), each ladder section comprising two ladder bars (2, 3) arranged parallel to each other and interconnected at one end by a rung to form a U-shaped ladder section, and where each ladder section (5) is telescopically inserted into a lower ladder section to form a collapsible ladder (1), and where dampers (23) are provided at the lower end of the ladder bars (2, 3, and where the locking mechanism comprises retaining mechanisms (20, 41) provided on each ladder bar (2, 3), where a single pair of actuators of the locking mechanism can be arranged on any of the ladder sections (5) and still be able to collapse the entire ladder (1).
    Type: Application
    Filed: May 29, 2006
    Publication date: February 26, 2009
    Applicant: Telesteps AB
    Inventor: Per-Olof Eriksson
  • Publication number: 20080023269
    Abstract: An access ladder includes a plurality of sections connected together to telescope between an extended position and a retracted position that has an increasing reactive force to counterbalance the weight of the sections as they extend. A method for accessing a room with a ladder connected to a ceiling including the steps of moving the ladder to a fully extended position subject to an increasingly active force to counterbalance the weight of the ladder as it extends. There is the step of retracting the ladder into a retracted position in the ceiling.
    Type: Application
    Filed: July 27, 2006
    Publication date: January 31, 2008
    Inventor: Thomas W. Parker
  • Patent number: 7316293
    Abstract: An extension ladder with improved mechanism includes a plurality of ladder sections, connection kits, locking mechanism, and transverse step portions; wherein each ladder section is a hollow rung, and the caliber of the rung becomes smaller when it is in a higher location. The upper ladder section and lower ladder section can be interconnected and fit each other; said connection kits are horizontally provided in the upper end of said ladder section. The internal part of said connection kit is provided with a locking mechanism to snap-fit into the through hole of said ladder section to secure the extension between each ladder section. The outside of said locking mechanism is covered by the transverse step portion, by the improved locking mechanism, the extension ladder can be assembled easily and firmly for providing superior safety to people, even when an external force is applied.
    Type: Grant
    Filed: May 17, 2006
    Date of Patent: January 8, 2008
    Inventors: Kuo-Ching Yao, Norman William Liefke
  • Publication number: 20080000723
    Abstract: An extendable/retractable ladder assembly includes a first column and a second column, the first column nesting in the second column, and a first rung coupled to, and extending from the second column. A ladder assembly bracket includes a collar portion, which extends about the second column, and a rung portion, which extends from the collar portion into the first rung. The collar portion may be gripped by a hand of an operator in order to position a thumb of the hand in engagement with a button to retract a locking pin of a latch assembly mounted within the rung portion of the bracket.
    Type: Application
    Filed: June 30, 2006
    Publication date: January 3, 2008
    Inventors: Mitchell I. Kieffer, Craig S. Aizman, Bruce A. Hillukka, Michael J. Kelly, Wayne A. Shakal
  • Publication number: 20070267252
    Abstract: An extension ladder with improved mechanism includes a plurality of ladder sections, connection kits, locking mechanism, and transverse step portions; wherein each ladder section is a hollow rung, and the caliber of the rung becomes smaller when it is in a higher location. The upper ladder section and lower ladder section can be interconnected and fit each other; said connection kits are horizontally provided in the upper end of said ladder section. The internal part of said connection kit is provided with a locking mechanism to snap-fit into the through hole of said ladder section to secure the extension between each ladder section. The outside of said locking mechanism is covered by the transverse step portion, by the improved locking mechanism, the extension ladder can be assembled easily and firmly for providing superior safety to people, even when an external force is applied.
    Type: Application
    Filed: May 17, 2006
    Publication date: November 22, 2007
    Inventors: Kuo-Ching Yao, Norman William Liefke
  • Patent number: 7159693
    Abstract: A novel escape system comprised of a plurality of escape devices each which resemble a window shutter, are mounted on the outside of a building, adjacent the windows vertically above the next lower escape device. Since these take up no space inside of the building, and are aesthetically pleasing, they are less likely to be removed or overridden making them functional a greater percentage of the time. Each is comprised of a frame to hold a plurality of slats connected to a collapsible vertical connecting means a predetermined distance apart from the others. In its storage position, the slats are held in the frame in an angled position resembling louvers. When in the operational position, the slats are allowed to drop down out of the frame and extend down to the next lower escape device with the slats acting as steps of a ladder. The bottommost end of the escape device connects to the top of the next lower escape device to create a continuous escape system allowing egress from any floor to the ground.
    Type: Grant
    Filed: August 17, 2004
    Date of Patent: January 9, 2007
    Inventor: Mark D. Mettler
  • Patent number: 7048094
    Abstract: Extending ladders and associated manufacturing methods are disclosed. A ladder in accordance with an exemplary embodiment of the present invention comprises a plurality of rung units, each rung unit including a left column, a right column, and a rung extending between the left column and the right column. The ladder may include a first column assembly including a first column and a ring coupled to the first column proximate a distal end thereof, and a second column assembly including a second column and a sleeve coupled to the second column proximate a proximal end thereof. The second column being at least partially disposed within a lumen defined by an internal surface of the first column. The sleeve includes an external guiding surface for contacting the internal surface of the first column and the ring includes an internal guiding surface for contacting an exterior surface of the second column.
    Type: Grant
    Filed: February 18, 2005
    Date of Patent: May 23, 2006
    Assignees: Core Distribution, Inc., Urban Sporting Goods
    Inventors: Mitchell I. Kieffer, Wang Kuo Hua, Craig S. Aizman
  • Patent number: 6883645
    Abstract: Extending ladders and associated manufacturing methods are disclosed. A ladder in accordance with an exemplary embodiment of the present invention comprises a plurality of rung units, each rung unit including a left column, a right column, and a rung extending between the left column and the right column. The ladder may include a first column assembly including a first column and a ring coupled to the first column proximate a distal end thereof, and a second column assembly including a second column and a sleeve coupled to the second column proximate a proximal end thereof. The second column being at least partially disposed within a lumen defined by an internal surface of the first column. The sleeve includes an external guiding surface for contacting the internal surface of the first column and the ring includes an internal guiding surface for contacting an exterior surface of the second column.
    Type: Grant
    Filed: January 17, 2004
    Date of Patent: April 26, 2005
    Assignees: Core Distribution, Inc., Urban Sporting Goods
    Inventors: Mitchell I. Kieffer, Wang Kuo Hua, Craig S. Aizman
  • Patent number: 6880675
    Abstract: A ladder assembly includes two symmetric support stands pivotally connected with each other. Each of the two support stands includes a main frame, an upper frame, a lower frame, a top bar, a retraction control unit, and four fixing devices. Thus, height of the ladder assembly can be adjusted easily and conveniently, thereby facilitating the user operating the ladder assembly. In addition, the upper frame and the lower frame can be folded on the main frame, so as to reduce the volume the ladder assembly efficiently, thereby greatly facilitating storage and transportation of the ladder assembly.
    Type: Grant
    Filed: April 25, 2003
    Date of Patent: April 19, 2005
    Inventor: Kuo-Ching Huang
  • Publication number: 20040195043
    Abstract: The invention relates to a collapsible ladder (1) having hollow ladder bars (2, 3) and ladder pins (4). The bars are divided into sections, which are telescopically inserted into each other and which in pairs at their top are connected to each other via a ladder pin, ladder sections, positioned above each other, being formed. The ends of the ladder pins (4) each houses its retaining mechanism (6), which via a locking pin (8) is locked against the lower portion of a ladder section, positioned above, in a separated or in a activated position of two such sections, arranged after each other, and which is releasable in order to allow an insertion of said ladder section, positioned above.
    Type: Application
    Filed: December 11, 2003
    Publication date: October 7, 2004
    Inventor: Kjell Johansson
  • Publication number: 20040144596
    Abstract: Extending ladders and associated manufacturing methods are disclosed. A ladder in accordance with an exemplary embodiment of the present invention comprises a plurality of rung units, each rung unit including a left column, a right column, and a rung extending between the left column and the right column. The ladder may include a first column assembly including a first column and a ring coupled to the first column proximate a distal end thereof, and a second column assembly including a second column and a sleeve coupled to the second column proximate a proximal end thereof. The second column being at least partially disposed within a lumen defined by an internal surface of the first column. The sleeve includes an external guiding surface for contacting the internal surface of the first column and the ring includes an internal guiding surface for contacting an exterior surface of the second column.
    Type: Application
    Filed: January 17, 2004
    Publication date: July 29, 2004
    Inventors: Mitchell I. Kieffer, Wang Kuo Hua, Craig S. Aizman
  • Patent number: 6708800
    Abstract: Extending ladders and associated manufacturing methods are disclosed. A ladder in accordance with an exemplary embodiment of the present invention comprises a plurality of rung units, each rung unit including a left column, a right column, and a rung extending between the left column and the right column. The ladder may include a first column assembly including a first column and a ring coupled to the first column proximate a distal end thereof, and a second column assembly including a second column and a sleeve coupled to the second column proximate a proximal end thereof. The second column being at least partially disposed within a lumen defined by an internal surface of the first column. The sleeve includes an external guiding surface for contacting the internal surface of the first column and the ring includes an internal guiding surface for contacting an exterior surface of the second column.
    Type: Grant
    Filed: August 2, 2002
    Date of Patent: March 23, 2004
    Assignees: Core Distribution, Inc., Urban Sporting Goods
    Inventors: Mitchell I. Kieffer, Wang Kuo Hua, Craig S. Aizman
  • Publication number: 20040020718
    Abstract: Extending ladders and associated manufacturing methods are disclosed. A ladder in accordance with an exemplary embodiment of the present invention comprises a plurality of rung units, each rung unit including a left column, a right column, and a rung extending between the left column and the right column. The ladder may include a first column assembly including a first column and a ring coupled to the first column proximate a distal end thereof, and a second column assembly including a second column and a sleeve coupled to the second column proximate a proximal end thereof. The second column being at least partially disposed within a lumen defined by an internal surface of the first column. The sleeve includes an external guiding surface for contacting the internal surface of the first column and the ring includes an internal guiding surface for contacting an exterior surface of the second column.
    Type: Application
    Filed: August 2, 2002
    Publication date: February 5, 2004
    Inventors: Mitchell I. Kieffer, Wang Kuo Hua, Craig S. Aizman
  • Patent number: 6612782
    Abstract: A telescoping tube for supporting surrounding walls of a shaft during the rescue of a victim trapped at the bottom of the shaft. The tube has nesting interlocking successive sections, each successive section having a diameter smaller than the preceding section. Each section has a top edge and a bottom edge. A bottom rim oriented inward extends around the bottom edge perimeter of each section. A pair of top lips oriented outward extend outward from opposite quadrants of the perimeter of the top edge of each section. When the telescoping tube is extended downward, the top lips of the sections rest upon the bottom rim of the preceding sections. In order to collapse the tube, the sections are pulled upward into the preceding sections, thereby bringing the top lips of the sections into contact with the bottom rim of the preceding sections.
    Type: Grant
    Filed: April 12, 2002
    Date of Patent: September 2, 2003
    Inventor: James Tengan
  • Patent number: 6520291
    Abstract: The lookout, designed to lean against a substantially cylindrical and vertical support extending above the ground, comprises a ladder having at least one upright provided with a plurality of rungs spaced at a predetermined distance. The ladder is telescopic, so that it has a total useful length capable of being reduced. The lookout further comprises a platform borne at the upper end of the ladder and provided with means for being braced against the support.
    Type: Grant
    Filed: March 19, 2001
    Date of Patent: February 18, 2003
    Inventor: GĂ©rard Andrey
  • Patent number: 6505707
    Abstract: A combination tree stand, blind and equipment carrier having a platform to support a user thereon within a user enclosure, a top frame member defining an upward opening of the enclosure, and first and second hinge assemblies connecting the top frame to the platform to allow it to be moved between a collapsed position and a fully erect position. The first and second hinge assemblies are positioned to extend between rearward and forward portions of the platform and the top frame. The hinge assemblies fold inward toward each other to collapse the enclosure for carrying or use as an equipment carrier when wheels are added. A seat is pivotally connected to the first hinge assembly which also serves as a back for the seat. A shelf and a splash panel are pivotally connected to the second hinge assembly. The platform has an access opening for the user to enter the user enclosure, and an access door.
    Type: Grant
    Filed: September 3, 1999
    Date of Patent: January 14, 2003
    Assignee: Hurrican Graphics, Inc.
    Inventor: David Lee Berry
  • Patent number: 6345691
    Abstract: A Ladder Latch System for securing telescoping ladders in the retracted position is described. The latching system is a component of a telescoping ladder system, which has as its main components a plurality of telescoping ladder legs, a ladder-mounting bracket, and a latch-releasing mechanism. The latching system is mounted to the ladder-mounting bracket and secures the telescoping ladder legs, which are in turn released by the latch-release mechanism.
    Type: Grant
    Filed: October 5, 2000
    Date of Patent: February 12, 2002
    Assignee: Windline Inc.
    Inventor: Hans Ruiz
  • Publication number: 20010015304
    Abstract: There is disclosed a ladder with side supports or stiles of flexible textile material and spaced rung members enclosed in tubular sleeves whose opposed ends are secured to the stiles.
    Type: Application
    Filed: December 5, 2000
    Publication date: August 23, 2001
    Inventor: Anthony James Patrick Hobbs
  • Patent number: 6129179
    Abstract: A laterally extensible ladder comprises first and second uprights having a plurality of adjacent rung assemblies mounted therebetween. Each rung assembly includes a first hollow rung element that defines a rung axis and a second rung element received in the first rung element. The second rung element is movable along the rung axis for adjusting the length of the rung assembly, hence adjusting the width of the ladder. At least one rung assembly includes a structure for releasably holding the rung assemblies at a selected width configuration.
    Type: Grant
    Filed: September 10, 1999
    Date of Patent: October 10, 2000
    Inventors: William V. Rooney, Julie M. Rooney
  • Patent number: 6099233
    Abstract: A ramp, for loading the box of a pick-up truck, has a pair of stringers and slidable rungs joined by lengths of chain. The stringers may be telescopically stored in storage tubes located on the box floor. The chains that join the rungs limit their separation when the ramp is extended. The stringers are tethered to the storage tubes when deployed and the storage tubes are optionally tethered to the truck box.
    Type: Grant
    Filed: November 12, 1999
    Date of Patent: August 8, 2000
    Inventor: Sidney W. Craik
  • Patent number: 6073726
    Abstract: An adjustable step ladder having four fixed side rails which are wider apart at the bottom than at the top. The step ladder has a conventional series of steps along one side. At the bottom of each of the legs an adjustable leg is located so that the ladder can be positioned in a horizontal manner no matter how irregular the terrain upon which it stands. One or more adjustable steps are affixable to the extending legs and the adjustable steps are telescoping so that they may be made wider nearer the bottom. The result is a completely adjustable ladder which is stable because it is wider at the bottom and which may have steps which are level even though the length of the legs are uneven.
    Type: Grant
    Filed: November 16, 1998
    Date of Patent: June 13, 2000
    Inventor: James D. McCrystal