WO1991015651A1 - Collapsible ladder - Google Patents
Collapsible ladder Download PDFInfo
- Publication number
- WO1991015651A1 WO1991015651A1 PCT/GB1991/000565 GB9100565W WO9115651A1 WO 1991015651 A1 WO1991015651 A1 WO 1991015651A1 GB 9100565 W GB9100565 W GB 9100565W WO 9115651 A1 WO9115651 A1 WO 9115651A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- ladder
- stiles
- sections
- rung
- rungs
- Prior art date
Links
Classifications
-
- E—FIXED CONSTRUCTIONS
- E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
- E06C—LADDERS
- E06C1/00—Ladders in general
- E06C1/02—Ladders in general with rigid longitudinal member or members
- E06C1/04—Ladders for resting against objects, e.g. walls poles, trees
- E06C1/08—Ladders for resting against objects, e.g. walls poles, trees multi-part
- E06C1/12—Ladders for resting against objects, e.g. walls poles, trees multi-part extensible, e.g. telescopic
- E06C1/125—Ladders for resting against objects, e.g. walls poles, trees multi-part extensible, e.g. telescopic with tubular longitudinal members nested within each other
Definitions
- the present invention relates to a ladder which can be collapsed for ease of storage.
- the ladder can be used as a fire escape and is more convenient to use than a conventional fixed length ladder in numerous situations, not only because of the ease of storage but because it need only be extended to the length required.
- Some ladders have been variations of rope ladders or chain ladders. Such ladders have the problem of instability in that they tend to swing to and fro and from side to side, making them difficult to use by the very young, the elderly or the infirm.
- GB-2233022 describes a step ladder with telescopically collapsible stiles.
- the rungs of this ladder have on their under-side latch mechanisms including resiliently biased pins which engage in holes in the stiles to lock the stiles in an extended position.
- a cord connected to the pins is also engaged by a button centrally mounted on the rung. When the button is depressed, it pulls on the cords and retracts the pins from the holes in the stiles, to allow the sections to be collapsed into one another.
- GB-2110286 describes a ladder in which the stiles incorporate studs on resilient levers mounted externally on the stiles.
- An eccentric formed on the lower end of the stile sections is proposed for bringing about automatic release. When the uppermost section of the stiles is collapsed, then as it reaches its lowermost position, it releases the next lower section thereby enabling the ladder to be collapsed from the top downwards.
- the present invention seeks to provide a telescopically collapsible ladder having automatic latching mechanisms for retaining the ladder in its extended condition which can be readily released when the ladder is to be collapsed even while the ladder is resting on its base.
- a collapsible ladder comprising two stiles formed of telescopically collapsible sections, a plurality of rungs each mounted between two sections of the respective stiles, and latch mechanisms located in the rungs for automatically locking the sections of the stiles relative to one another when the sections are extended, wherein the latch mechanisms in each rung are arranged to release the sections of the stiles connected to the next higher rung when the rung is collapsed against the next lower rung.
- the latch mechanisms may comprise pins biased by springs towards holes or recesses in the stile sections and release levers for retracting the pins from the stiles when each rung is collapsed onto the rung beneath it.
- the ladder can be collapsed from the lowermost section upwards as opposed to the prior art proposal of collapsing the ladder from the top downwards.
- this design offers the advantage of being considerably safer to use in that risk of inadvertent collapse of the ladder in use is reduced by the fact that when the weight of a person is on the ladder the pin are under load and cannot easily be retracted.
- many of the disclosed telescopically collapsible ladders see for example US 3,653,463 have stiles of open section. Such a construction inevitably makes for a weaker structure and, in the preferred embodiment of the invention, the stiles are of a regular closed section, being preferably formed of circular tubing.
- the latch mechanisms not only the prevent the stiles from being collapsed into one another but are also exclusively relied upon to inhibit the sections from being pulled apart.
- each section of the stiles has a larger outer diameter at its lower end than the inner diameter at the top of the section in which it fits. Though this dictates the order in which the sections are assembled during manufacture, when the ladder is suspended from a bracket and used as a fire escape, engagement of the resiliently biased pins of the latch mechanism is not relied upon for the strength and integrity of the ladder.
- the ladder can safely be extended by simply hooking its top rung over a support bracket and letting the weight of the lower sections open the ladder up automatically. If the ladder does not extend fully under its own weight, then its safety is in no way impaired as it will extend further during use.
- Figure 1 is a view of a ladder of the invention in its extended condition
- Figure 2 schematically shows the ladder of Figure 1 in its collapsed condition
- Figure 3 is a section through a rung showing one form of latch mechanism for retaining the ladder in its extended condition
- Figure 4 is a section through a rung showing an alternative form of latch mechanism
- Figure 5 schematically shows the ladder in use when resting on its base
- Figure 6 shows the ladder when used as a fire escape and suspended from its top rung.
- Figure 1 shows an aluminium ladder formed of two stiles and rungs 11 extending between the stiles.
- the stiles are formed of telescopically collapsed sections 10 and each rung 11 is secured to two sections 10.
- the sections are of circular tubing and are prevented from being pulled apart by virtue of the fact that the sections are formed with stepped inner and outer surfaces and can only be axially moved relative to one another until the steps meet.
- the steps are formed of enlarged diameter portions at the lower ends of the sections and reduced diameter portions at their upper ends. The length of these portions dictates the minimum overlap between the sections when the ladder is extended and it is preferred that there should be between 5 cm and 10 cm of overlap to enable the ladder to withstand flexing.
- FIG. 2 shows a cross member 16 secured to the lowermost sections 10 of the stiles.
- the lowermost sections 10 now form with their respective rung 11 and the cross member 16 a rigid frame which ensures the rigidity of the entire ladder.
- Figure 6 shows the ladder in use as a fire escape.
- a window sill 27 in a wall 26 has a suspension bracket 17 mounted beneath it. The uppermost rung 11 is placed over the bracket 17 and the pin 14 is removed to allow the ladder to extend itself under its own weight.
- a stand-off bracket 18 hinged to the cross member 16 and having its movement limited by a chain 25 acts to maintain the ladder at an angle to the wall and thereby make it easier to use.
- the stiles are in tension and the maximum extension of the stiles is limited by the mutual abutment of the steps formed in the sections of the stiles. There is therefore strictly no need to lock the sections in their extended position but nevertheless the invention does provide latch mechanisms in the rungs for added security when the ladder is used as a fire escape and also to enable the ladder to be used while resting on its base plate.
- FIG. 5 The latter mode of use of the ladder is shown in Figure 5 and differs from its mode of use as a fire escape in that the stiles are in compression.
- the weight of a person on the ladder acts to collapse the ladder whereas in Figure 6 it acts to extend it.
- latch mechanisms it is essential for latch mechanisms to be provided if the ladder is to be used in this mode.
- a stand-off bracket 28 may be provided part way up the ladder to limit the extend of flexing of the ladder.
- the stand-off bracket may be permanently hinged to one of the rungs but it is preferred to provide a loose clip-on bracket which can be positioned as desired on any rung of the ladder to limit the flexing of the ladder.
- the latch mechanism comprises a retractable pin 30 which is biased by a spring 31 in the direction of the stiles.
- a hole 32 is formed in the sections 10 to line up with the pin 30 when the ladder is fully extended so that the pin 30 enters the hole 32 automatically and prevents the ladder from collapsing.
- the pins 30 of the lowermost rung are manually retracted to allow the rung to rise in the direction of the one above it.
- an upwardly projecting ramp 29 on the lower rung 11 engages a release lever 30a projecting from the pin 30 and retracts the pin 30 from the hole 32 against the action of the spring 30.
- the latch mechanism in Figure 4 is designed in the same way to come into effect automatically when the ladder is extended and to be self releasing if the ladder is collapsed from the based upwards.
- a bell crank release lever 23 pivoted on the rung about a pin 24 has its shorter arm pivoted to a pin 21 which passes through holes 19 and 20 in the sections 10 and in the rungs 11 to lock the stiles in the extended position.
- the bell crank lever 23 is biases anti-clockwise, as viewed, by a spring 22 acting between the lever 23 and the retractable pin 21.
- the lowermost rung is freed by raising the projecting arm of the bell crank lever 23 and as each rung approaches the rung above, it rotates the bell crank lever 23 clockwise, as viewed, and disengages the pin 21 from the holes 19 and 20.
- a ladder in accordance with the invention, one starts from the lowermost pair of sections and secures a rung 11 to their upper ends and the base plate 16 to their lower ends. The next smaller diameter sections 10 are then inserted from below into the lowermost sections and a rung is attached to them. The ladder is then built up to its full length by assembling one rung at a time to the projecting ends of the individual sections 10.
- the sections 10 have reduced diameter portion at their upper ends, as earlier stated, to provide interlock between the sections when the ladder is extended. These same reduced diameter portion may be used to receive the rungs. It is preferred that the rungs 11 be provided with holes which are an interference fit or a shrink fit (requiring the rungs to be heated or the stile sections cooled before assembly) over the ends of the sections 10 so that the forcing of. a rung over the sections not only secures the two to one another but also prevents the sections from splaying out under load. Such a method of manufacture makes for rapid and secure assembly. In use, the forces acting on the rung act to improve the grip of the rungs on the sections and no further means are necessary to retain the rungs on the sections of the stiles. However, if desired, self tapping screws or welding may be used for this purpose.
- the rungs may be formed, for example by casting, in one piece to define U-shaped channels on their under-side for receiving the latch mechanisms and end cups to fit over the stiles. It is alternatively possible, however, for the rungs to be assembled from a length of extruded aluminium fitted with preformed ends of plastics material or aluminium, which define the cups to fit over the stiles.
- Each latch mechanism preferably comprises a plastics block holding the pin, the release lever and the spring which is fitted within the channel defined by the under-side of the rung and held in position by a rivet, a bolt or rolled steel pin.
Landscapes
- Ladders (AREA)
- Steps, Ramps, And Handrails (AREA)
- Lock And Its Accessories (AREA)
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
BR919106325A BR9106325A (en) | 1990-04-10 | 1991-04-10 | RETRACTABLE HAND LADDER |
DE69120065T DE69120065T2 (en) | 1990-04-10 | 1991-04-10 | FOLDABLE LADDER |
EP91907537A EP0527766B1 (en) | 1990-04-10 | 1991-04-10 | Collapsible ladder |
CA002080135A CA2080135C (en) | 1990-04-10 | 1991-04-10 | Collapsible ladder |
GR960401957T GR3020598T3 (en) | 1990-04-10 | 1996-07-23 | Collapsible ladder |
Applications Claiming Priority (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB909008092A GB9008092D0 (en) | 1990-04-10 | 1990-04-10 | Tubular telescopic ladder |
GB9008092.0 | 1990-04-10 | ||
GB9010990.1 | 1990-05-16 | ||
GB9010990A GB2242925A (en) | 1990-04-10 | 1990-05-16 | Collapsible ladder |
GB909026295A GB9026295D0 (en) | 1990-04-10 | 1990-12-04 | Ladder |
GB9026295.7 | 1990-12-04 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1991015651A1 true WO1991015651A1 (en) | 1991-10-17 |
Family
ID=27265039
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/GB1991/000565 WO1991015651A1 (en) | 1990-04-10 | 1991-04-10 | Collapsible ladder |
Country Status (11)
Country | Link |
---|---|
EP (1) | EP0527766B1 (en) |
JP (1) | JP3117993B2 (en) |
AT (1) | ATE139006T1 (en) |
AU (1) | AU643520B2 (en) |
BR (1) | BR9106325A (en) |
CA (1) | CA2080135C (en) |
DE (1) | DE69120065T2 (en) |
DK (1) | DK0527766T3 (en) |
ES (1) | ES2089208T3 (en) |
GR (1) | GR3020598T3 (en) |
WO (1) | WO1991015651A1 (en) |
Cited By (25)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2263932A (en) * | 1992-02-01 | 1993-08-11 | Telesteps Limited | Loft ladder. |
DE4424839A1 (en) * | 1994-07-14 | 1996-01-18 | Mach Et Vertriebsgesellschaft | Collapsible ladder |
DE19501689A1 (en) * | 1995-01-20 | 1996-08-01 | Johann Brenner | Extending ladder with equally sized rungs |
GB2305956A (en) * | 1995-10-02 | 1997-04-23 | Gary Kuo | An extension ladder with telescopic legs |
US5738186A (en) * | 1994-03-01 | 1998-04-14 | Foxdale Developments Limited | Extensible ladder |
DE19653003C2 (en) * | 1996-12-19 | 1999-05-27 | Giesserei & Montage Gmbh | Collapsible ladder |
WO2002101189A1 (en) * | 2001-06-13 | 2002-12-19 | Telesteps Ab | Collapsible ladder |
US6505707B1 (en) * | 1998-09-03 | 2003-01-14 | Hurrican Graphics, Inc. | Combination tree stand, blind and equipment carrier |
EP1447520A3 (en) * | 2003-02-11 | 2005-05-11 | James Thomas Weston | Ladder Accessory |
WO2005100716A1 (en) * | 2004-04-16 | 2005-10-27 | Telesteps Ab | Loft ladder assembly |
WO2007057280A1 (en) * | 2005-11-18 | 2007-05-24 | Telesteps Ab | Collapsible platform |
DE102006015927A1 (en) * | 2006-04-05 | 2007-10-18 | Telemaster Montage & Aluguss Gmbh | Foldable ladder, has locking unit for detachable locking of ladder sections in pulled-apart condition, where locking unit for locking ladder with extension module is arranged in ladder stringer ends of ladder |
US20110240405A1 (en) * | 2006-07-27 | 2011-10-06 | Parker Thomas W | Tubular access ladder and method |
WO2012004333A1 (en) * | 2010-07-08 | 2012-01-12 | Telesteps Ab | An improved collapsible ladder |
CN101223332B (en) * | 2005-06-01 | 2012-03-21 | 泰利斯泰普斯股份公司 | Collapsible ladder with locking mechanism |
US8225906B2 (en) | 2008-08-22 | 2012-07-24 | Core Distribution, Inc. | Extendable/retractable ladder |
US8387753B2 (en) | 2006-06-30 | 2013-03-05 | Core Distribution, Inc. | Ergonomic extendable/retractable ladder |
US8622175B2 (en) | 2008-11-28 | 2014-01-07 | Patentselskabet Af 10. December 2010 Aps | Collapsible ladder |
CN104769206A (en) * | 2012-07-25 | 2015-07-08 | 泰利托尔康姆有限公司 | Telescopically collapsible fire escape ladder |
WO2016028147A2 (en) | 2014-08-18 | 2016-02-25 | Lampe Holding B.V. | Telescopic ladder assembly |
WO2018104843A1 (en) * | 2016-12-05 | 2018-06-14 | GWINNETT, Simon Paul | A collapsible ladder apparatus |
US10731413B2 (en) | 2014-12-02 | 2020-08-04 | Core Distribution, Inc. | Foldable ladder |
US10995547B2 (en) | 2016-02-29 | 2021-05-04 | Core Distribution, Inc. | Telescoping ladder with a cascading collapse mechanism |
US11174678B2 (en) | 2017-11-08 | 2021-11-16 | Core Distribution, Inc. | Locking assembly for a telescoping ladder |
US11795760B2 (en) | 2019-10-24 | 2023-10-24 | Core Distribution, Inc. | Ladder tripod assembly and system |
Families Citing this family (17)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2418702A (en) * | 2004-09-29 | 2006-04-05 | James Thomas Weston | Telescopic loft ladder |
EP1816313A1 (en) | 2006-02-07 | 2007-08-08 | Telesteps AB | Collapsible stepladder |
EP1843005B1 (en) * | 2006-04-06 | 2008-12-17 | Telesteps AB | Ladder with a locking mechanism |
WO2009057995A1 (en) | 2007-11-02 | 2009-05-07 | Lampe Holding B.V. | A telescopic ladder assembly |
CN201250602Y (en) | 2008-08-14 | 2009-06-03 | 王万兴 | Extension ladder |
DE202009007991U1 (en) | 2009-06-05 | 2010-10-28 | Ovibell Pflanzen, Deko Und Freizeit Gmbh & Co. Kg | Telescopic ladder |
EP2711496B1 (en) * | 2009-10-07 | 2016-06-08 | Lampe Holding B.V. | Portable ladder with a stand off device |
DE202011051394U1 (en) | 2011-02-02 | 2011-10-13 | Patentselskabet Af 10. December 2010 Aps | Collapsible ladder |
GB2497608B (en) * | 2012-05-14 | 2016-09-21 | Teletower Com Ltd | Telescopic loft ladder |
WO2014139940A1 (en) | 2013-03-11 | 2014-09-18 | Martinus Nielsen Aps | Collapsible ladder |
DE202014010305U1 (en) | 2013-08-09 | 2015-03-11 | Patentselskabet Af 10. December 2010 Aps | Collapsible ladder |
DE102014104039B4 (en) | 2014-03-24 | 2019-03-28 | Ergobionik Gmbh | stepladder |
CA3044940C (en) | 2015-11-28 | 2024-01-02 | Otto Martinus Nielsen | Collapsible ladder |
CN106602442B (en) * | 2016-12-22 | 2018-08-31 | 国网浙江省电力公司金华供电公司 | A kind of GW7 types disconnecting switch inspection platform |
JP6600887B2 (en) * | 2017-08-19 | 2019-11-06 | 特殊梯子製作所有限会社 | Extendable hanging ladder |
USD959024S1 (en) | 2020-12-04 | 2022-07-26 | Dorel Home Furnishings, Inc. | Tray for telescoping ladder |
SE2151545A1 (en) | 2021-12-16 | 2023-04-18 | Telesteps Ab | Collapsible step ladder and a connection bracket therefor |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR381897A (en) * | 1906-09-14 | 1908-01-23 | Johann Josef Hersche | Window sill convertible into a rescue ladder |
US1712942A (en) * | 1927-12-29 | 1929-05-14 | Hiram K Smith | Collapsible ladder |
US2542398A (en) * | 1945-07-28 | 1951-02-20 | Mary Crumpton Murray | Ladder |
US2827216A (en) * | 1955-05-25 | 1958-03-18 | Leonard B Napolitano | Telescopic step or rung ladders |
US3653463A (en) * | 1970-06-22 | 1972-04-04 | E T Hannan & Associates Inc | Collapsible ladder arrangement |
GB2110286A (en) * | 1981-05-08 | 1983-06-15 | Bier And Son I | Light and extensible ladder |
-
1991
- 1991-04-10 BR BR919106325A patent/BR9106325A/en not_active IP Right Cessation
- 1991-04-10 AU AU76652/91A patent/AU643520B2/en not_active Expired
- 1991-04-10 DK DK91907537.4T patent/DK0527766T3/en active
- 1991-04-10 ES ES91907537T patent/ES2089208T3/en not_active Expired - Lifetime
- 1991-04-10 DE DE69120065T patent/DE69120065T2/en not_active Expired - Lifetime
- 1991-04-10 CA CA002080135A patent/CA2080135C/en not_active Expired - Lifetime
- 1991-04-10 JP JP03506995A patent/JP3117993B2/en not_active Expired - Lifetime
- 1991-04-10 WO PCT/GB1991/000565 patent/WO1991015651A1/en active IP Right Grant
- 1991-04-10 EP EP91907537A patent/EP0527766B1/en not_active Expired - Lifetime
- 1991-04-10 AT AT91907537T patent/ATE139006T1/en not_active IP Right Cessation
-
1996
- 1996-07-23 GR GR960401957T patent/GR3020598T3/en unknown
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR381897A (en) * | 1906-09-14 | 1908-01-23 | Johann Josef Hersche | Window sill convertible into a rescue ladder |
US1712942A (en) * | 1927-12-29 | 1929-05-14 | Hiram K Smith | Collapsible ladder |
US2542398A (en) * | 1945-07-28 | 1951-02-20 | Mary Crumpton Murray | Ladder |
US2827216A (en) * | 1955-05-25 | 1958-03-18 | Leonard B Napolitano | Telescopic step or rung ladders |
US3653463A (en) * | 1970-06-22 | 1972-04-04 | E T Hannan & Associates Inc | Collapsible ladder arrangement |
GB2110286A (en) * | 1981-05-08 | 1983-06-15 | Bier And Son I | Light and extensible ladder |
Cited By (42)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2263932B (en) * | 1992-02-01 | 1995-06-28 | Telesteps Limited | Loft ladder |
GB2263932A (en) * | 1992-02-01 | 1993-08-11 | Telesteps Limited | Loft ladder. |
US5738186A (en) * | 1994-03-01 | 1998-04-14 | Foxdale Developments Limited | Extensible ladder |
DE4424839A1 (en) * | 1994-07-14 | 1996-01-18 | Mach Et Vertriebsgesellschaft | Collapsible ladder |
WO1996002727A1 (en) * | 1994-07-14 | 1996-02-01 | Mach Et Vertriebsgesellschaft Br Sabine Bolwin & Jürgen Hoppe | Telescopic ladder |
DE19501689C2 (en) * | 1995-01-20 | 1999-02-25 | Johann Brenner | Pull-out ladder |
DE19501689A1 (en) * | 1995-01-20 | 1996-08-01 | Johann Brenner | Extending ladder with equally sized rungs |
GB2305955A (en) * | 1995-10-02 | 1997-04-23 | Gary Kuo | An extension ladder with telescopic legs |
GB2305956A (en) * | 1995-10-02 | 1997-04-23 | Gary Kuo | An extension ladder with telescopic legs |
GB2305956B (en) * | 1995-10-02 | 1999-10-06 | Gary Kuo | An extension ladder with telescopic legs |
GB2305955B (en) * | 1995-10-02 | 1999-12-01 | Gary Kuo | An extension ladder with telescopic legs |
DE19653003C2 (en) * | 1996-12-19 | 1999-05-27 | Giesserei & Montage Gmbh | Collapsible ladder |
US6505707B1 (en) * | 1998-09-03 | 2003-01-14 | Hurrican Graphics, Inc. | Combination tree stand, blind and equipment carrier |
AU2002311256B2 (en) * | 2001-06-13 | 2006-09-07 | Telesteps Ab | Collapsible ladder |
WO2002101189A1 (en) * | 2001-06-13 | 2002-12-19 | Telesteps Ab | Collapsible ladder |
EP1447520A3 (en) * | 2003-02-11 | 2005-05-11 | James Thomas Weston | Ladder Accessory |
CN100447371C (en) * | 2004-04-16 | 2008-12-31 | 泰利斯泰普斯公司 | Loft ladder assembly |
WO2005100716A1 (en) * | 2004-04-16 | 2005-10-27 | Telesteps Ab | Loft ladder assembly |
AU2005233496B2 (en) * | 2004-04-16 | 2011-03-24 | Telesteps Ab | Loft ladder assembly |
CN101223332B (en) * | 2005-06-01 | 2012-03-21 | 泰利斯泰普斯股份公司 | Collapsible ladder with locking mechanism |
WO2007057280A1 (en) * | 2005-11-18 | 2007-05-24 | Telesteps Ab | Collapsible platform |
DE102006015927B4 (en) * | 2006-04-05 | 2008-04-24 | Telemaster Montage & Aluguss Gmbh | Collapsible ladder |
DE102006015927A1 (en) * | 2006-04-05 | 2007-10-18 | Telemaster Montage & Aluguss Gmbh | Foldable ladder, has locking unit for detachable locking of ladder sections in pulled-apart condition, where locking unit for locking ladder with extension module is arranged in ladder stringer ends of ladder |
US8387753B2 (en) | 2006-06-30 | 2013-03-05 | Core Distribution, Inc. | Ergonomic extendable/retractable ladder |
US20110240405A1 (en) * | 2006-07-27 | 2011-10-06 | Parker Thomas W | Tubular access ladder and method |
US8348015B2 (en) * | 2006-07-27 | 2013-01-08 | Werner Co. | Tubular access ladder and method |
US10053912B2 (en) | 2008-08-22 | 2018-08-21 | Core Distribution, Inc. | Extendable / retractable ladder |
US8225906B2 (en) | 2008-08-22 | 2012-07-24 | Core Distribution, Inc. | Extendable/retractable ladder |
US10753149B2 (en) | 2008-08-22 | 2020-08-25 | Core Distribution, Inc. | Extendable / retractable ladder |
US8622175B2 (en) | 2008-11-28 | 2014-01-07 | Patentselskabet Af 10. December 2010 Aps | Collapsible ladder |
WO2012004333A1 (en) * | 2010-07-08 | 2012-01-12 | Telesteps Ab | An improved collapsible ladder |
CN103025992B (en) * | 2010-07-08 | 2016-04-06 | 泰利斯泰普斯公司 | Improved extensible ladder |
CN103025992A (en) * | 2010-07-08 | 2013-04-03 | 泰利斯泰普斯公司 | An improved collapsible ladder |
CN104769206A (en) * | 2012-07-25 | 2015-07-08 | 泰利托尔康姆有限公司 | Telescopically collapsible fire escape ladder |
WO2016028147A2 (en) | 2014-08-18 | 2016-02-25 | Lampe Holding B.V. | Telescopic ladder assembly |
US10161184B2 (en) | 2014-08-18 | 2018-12-25 | Lampe Holding B.V. | Telescopic ladder assembly |
EP3581754A1 (en) | 2014-08-18 | 2019-12-18 | Lampe Holding B.V. | Telescopic ladder assembly |
US10731413B2 (en) | 2014-12-02 | 2020-08-04 | Core Distribution, Inc. | Foldable ladder |
US10995547B2 (en) | 2016-02-29 | 2021-05-04 | Core Distribution, Inc. | Telescoping ladder with a cascading collapse mechanism |
WO2018104843A1 (en) * | 2016-12-05 | 2018-06-14 | GWINNETT, Simon Paul | A collapsible ladder apparatus |
US11174678B2 (en) | 2017-11-08 | 2021-11-16 | Core Distribution, Inc. | Locking assembly for a telescoping ladder |
US11795760B2 (en) | 2019-10-24 | 2023-10-24 | Core Distribution, Inc. | Ladder tripod assembly and system |
Also Published As
Publication number | Publication date |
---|---|
GR3020598T3 (en) | 1996-10-31 |
CA2080135A1 (en) | 1991-10-11 |
ATE139006T1 (en) | 1996-06-15 |
DE69120065T2 (en) | 1996-10-02 |
EP0527766A1 (en) | 1993-02-24 |
JPH05508456A (en) | 1993-11-25 |
DE69120065D1 (en) | 1996-07-11 |
ES2089208T3 (en) | 1996-10-01 |
BR9106325A (en) | 1993-04-20 |
AU7665291A (en) | 1991-10-30 |
AU643520B2 (en) | 1993-11-18 |
JP3117993B2 (en) | 2000-12-18 |
CA2080135C (en) | 1999-10-19 |
EP0527766B1 (en) | 1996-06-05 |
DK0527766T3 (en) | 1996-06-24 |
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