US2827216A - Telescopic step or rung ladders - Google Patents

Telescopic step or rung ladders Download PDF

Info

Publication number
US2827216A
US2827216A US511074A US51107455A US2827216A US 2827216 A US2827216 A US 2827216A US 511074 A US511074 A US 511074A US 51107455 A US51107455 A US 51107455A US 2827216 A US2827216 A US 2827216A
Authority
US
United States
Prior art keywords
ladder
sections
rung
rungs
stiles
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US511074A
Inventor
Leonard B Napolitano
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to US511074A priority Critical patent/US2827216A/en
Application granted granted Critical
Publication of US2827216A publication Critical patent/US2827216A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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
    • 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
    • E06C1/14—Ladders capable of standing by themselves
    • E06C1/16—Ladders capable of standing by themselves with hinged struts which rest on the ground
    • E06C1/20—Ladders capable of standing by themselves with hinged struts which rest on the ground with supporting struts formed as poles
    • E06C1/22—Ladders capable of standing by themselves with hinged struts which rest on the ground with supporting struts formed as poles with extensible, e.g. telescopic, ladder parts or struts

Definitions

  • ELESCOPIC STEP 0R RUNG LADDERS Filed may 25. 1955 2 sheets-sheet 2 m 4 9 a U D .nll- IP l nln .4 I l
  • This invention relates to ladders, and, more particularly, to telescopic step or rung ladders.
  • An object of my invention is to provide a ladder which may be readily reduced in length to permit easy and economic storage in a limited space.
  • Another object of my invention is to provide a sturdy, relatively light weight, ladder which has telescopic stiles permitting easy collapsing of the ladder into a compact unit.
  • Still another object of my invention is to provide a lightweight, relatively economic, strong, easily collapsible ladder of the step or rung type.
  • a more specific object of my invention is to provide a self-supporting ladder wherein the uprights or stiles are in sections which can be readily telescoped or extended from each other and locked by means of interlocking means in the interconnecting rung members.
  • Fig. l is a side View of a step ladder in extended or operable position and forming one embodiment of my invention
  • FIG. 2 is 'a front view of Fig. l, showing the sections of the ladder;
  • Fig. 3 is a front view of the ladder shown in Fig. 2 but in collapsed or compacted position;
  • Fig. 4 is a sectional, enlarged view taken on line 4 4 of Fig. 2;
  • Fig. 5 is a sectional enlarged view taken on line 5-5 of Fig. 2 showing the section locking means in engaging position.
  • Fig. 6 is a section showing the disengagement of the locking means before the collapsing action of the ladder
  • Fig. 7 is a front view of an open or an extended rung ladder, forming another embodiment of my invention.
  • Fig. 8 is a side view of Fig. 7;
  • Fig. 9 is a front view of the ladder shown in Fig. 7, but in collapsed or compacted condition;
  • Fig. l0 is a detail taken on line 10-10 of Fig. 8 showing the positive action of the locking means in the rung;
  • Fig. 11 is a sectional detail similar to Fig. 10, but showing the locking means in the rung in disengaged position.
  • the ladder 15 as shown in Figs. 1 to 3, inclusive, is a step ladder and consists of two relatively movable and collapsible parts 16 and 17, respectively, and which are of relatively similar construction, but are shown in mirror image relationship. Said two sections are each connected at their upper end to a at top or shelf member 13 by means of pivoted members or hinges 19 and 20.
  • Part 17 has a pair of opposed vertical Stiles 22 and 23, each consisting of a plurality of telescopic sections 24, 25, 26, 27 and 28, the number thereof depending upon the desired length of the ladder.
  • said sections for purposes of illustration, are shown as rectangularly shaped, although I am not limited to such shape.
  • Each section has at its ends connecting with the next succeeding section an upper slot or opening 29 and a lower slot or opening 30.
  • Such slots or openings as shown may be of rectangular or other suitable shape and extend outwardly lof the stile to permit the passage and lodging therein of a cross bar 31 which extends through each of said rungs 32 as shown.
  • Said bar 31 in each rung interconnects the sections of said stiles 22 and 23, preferably at the location where the sections when extended for their respective slots or openings are in engageable alignment.
  • the rungs will usually correspond with the number of sections so as to facilitate collapsing of the ladder or telescoping of the respective sections in each stile.
  • each rung 32 there is provided with the cross bar 31 one or more coil spring members 33 which are fixed at one end to the underside of each rung 32 and at the other end to the cross bar 31, said cross bar being preferably cylindrical in shape to facilitate easy movement of the same into the slots or openings 29 and 30 of the different sections.
  • Each of said bars 31 is provided with at least one bar member 34 which is xed to the bar 31 and extends through an opening 34a from the underside wall of each rung between the stiles.
  • Each rung 32 is furthermore provided with lateraly disposed end slots or openings 35 and 36 at the opposite ends thereof, so that when the stiles 16 and 17 are to be brought together in vertical arrangement, preparatory to collapsing the ladder, the protruding bar 34 will come into contact with the rear face 37 of each opposed rungs 37a on stile 17 so as to force the iiat bar 34 inwardly against the action of springs 33 thereby releasing the cross bar 31 from locking engagement with the upper and lower rung sections, whereupon said sections Will automatically collapse into the lowermost section 28 so as to form a compact unit 38, as shown in Fig. 3.
  • a rung ladder 39 preferably of tubular construction which has a pair of stiles 40 and 41, each consisting of upwardly extending sections 42, 43, 44 and 45, and downwardly extending sections 46, 47, 48 and 49, protruding from the central sections 50 and 51, respectively, which central sections have interconnecting fixed rungs 52, 53 and 54.
  • the number of upwardly and downwardly extending sections may be varied depending on the desired length of the ladder.
  • Said central portions 50 and 51 are of the greatest outside diameter and are intended to support the upwardly extending and downwardly extending telescopic sections above indicated.
  • Each of said sections 42, 43, 44, 45, 46, 47, 48 and 49 is provided at their upper and lower ends with an inner opening or slot 55 as shown, which openings are adapted to come into alignment with the opening of the next successive upper or lower section as the case may be.
  • each of the sections Interconnecting each of the sections is a series of rungs 56 fixed to each opposed section, and ,through which extend a pair of bars 57 and 58 normally kept and spread apart, as shown in Fig. Vl0by means of a tensionfspring member 59, whereby the ends of said bars extend throughV the openings or slots 55 into the section.
  • said rungs are in the present instance shown as cylindrical and entertain Vthe bars 57v and 58;
  • Each of said bars 57 and 58 has a protruding pin 60 ⁇ extending outwardly of theY rungft56 through slots 61 in each rung.
  • the interlocking .engagingV and disengaging means are spring operableon releasable.
  • the interlocking Vmeans provided in each rung act as stops for the sections affording Sufficient rigidity and sturdiness to the ladder to accommodate thefperson of more than average weight.
  • I furthermore show-the component parts of the ladder as eitherrrrectangular or: cylindrical'in shape; However, I amV not limited to suchshape but may useV any otherV shape inV the formationtofl the Y Y dierent parts of the ladder.
  • Y YSaid ladder is'maderof'relatively light weight metal, such as aluminum, or aluminum alloys, which will aiord sufficient sturdiness ori strength YVto cope with the usual weights of usersl of the ladder.
  • Arcollapsible 'step ladder comprising a plurality ofY stiles, Veachy having a multiplicity of telescopicV sections, and a plurality "of rungs interconnecting the Stiles, each rung having'dispose'd underneath the step portion releasable locking means. extending acrossA the rung for each of the sections, said locking means having protruding means adapted when a pair of said stilestare brought together in closed position to contact the opposed rungs thereon and automatically release the locking means thereon to. permit telescoping of the. sections.. t

Landscapes

  • Ladders (AREA)

Description

March 18, 1958 B, NAPOLITANO 2,827,216
TELESCOPIC STEP OR RUNG LDDERS` Filed May 25. 1955 2 Shee'lzs-Sheei'I 1 LEONARD a. NAPOLITAN ATTORNEY March 18, 1958 1 9. NAPoLla-ANO 2,327,216
ELESCOPIC STEP 0R RUNG LADDERS Filed may 25. 1955 2 sheets-sheet 2 m 4 9 a U D .nll- IP l nln .4 I l ||.|1| J i. im W vw .a .m` 5. J.\ J f uw J 6 6 5 4 9 5. 4 6 5 1 5 5 9 5 4 4 4 4 3 4 m 5 4 4 4 4 f L r f 1e 5 67 6 6 6 n .hw .w 5 u M 5 5 5 n.- .4 4 L 1 4 4 4 4 m w 4 4 4 ATTORNEY United States Patent F TELESCOPIC STEP R RUNG LADDERS Leonard B. Napolitano, Brooklyn, N. Y.
Application May 25, 1955, Serial No. 511,074
2 Claims. (Cl. 228-39) This invention relates to ladders, and, more particularly, to telescopic step or rung ladders.
An object of my invention is to provide a ladder which may be readily reduced in length to permit easy and economic storage in a limited space.
Another object of my invention is to provide a sturdy, relatively light weight, ladder which has telescopic stiles permitting easy collapsing of the ladder into a compact unit.
Still another object of my invention is to provide a lightweight, relatively economic, strong, easily collapsible ladder of the step or rung type.
A more specific object of my invention is to provide a self-supporting ladder wherein the uprights or stiles are in sections which can be readily telescoped or extended from each other and locked by means of interlocking means in the interconnecting rung members.
Other objects and advantageous features of my invention will become apparent from the following detailed description taken in conjunctionV with the accompanying drawings, wherein: l
l Fig. l is a side View of a step ladder in extended or operable position and forming one embodiment of my invention;V
' Fig. 2 is 'a front view of Fig. l, showing the sections of the ladder;
Fig. 3 is a front view of the ladder shown in Fig. 2 but in collapsed or compacted position;
Fig. 4 is a sectional, enlarged view taken on line 4 4 of Fig. 2;
Fig. 5 is a sectional enlarged view taken on line 5-5 of Fig. 2 showing the section locking means in engaging position.
Fig. 6 is a section showing the disengagement of the locking means before the collapsing action of the ladder;
Fig. 7 is a front view of an open or an extended rung ladder, forming another embodiment of my invention;
Fig. 8 is a side view of Fig. 7;
Fig. 9 is a front view of the ladder shown in Fig. 7, but in collapsed or compacted condition;
Fig. l0 is a detail taken on line 10-10 of Fig. 8 showing the positive action of the locking means in the rung; and
Fig. 11 is a sectional detail similar to Fig. 10, but showing the locking means in the rung in disengaged position.
Referring now to the drawings wherein like parts refer to like parts throughout, it will be noted that I show in Figs. 1 6, a step ladder, whereas in Figs. 8 to l1, I show a collapsible rung-type of ladder. Both of said ladders embody my invention.
The ladder 15 as shown in Figs. 1 to 3, inclusive, is a step ladder and consists of two relatively movable and collapsible parts 16 and 17, respectively, and which are of relatively similar construction, but are shown in mirror image relationship. Said two sections are each connected at their upper end to a at top or shelf member 13 by means of pivoted members or hinges 19 and 20.
2,827,216 Patented Mar. 18, 1958 riice be considered as the front of the ladder while the section 16 may be considered as the rear of the ladder. Furthermore, part 17 willbe described and will apply also to part 16. Parts 16 and 17 are held in relatively spaced position by means of a link or chain stay or the like 21.
Part 17, as shown, has a pair of opposed vertical Stiles 22 and 23, each consisting of a plurality of telescopic sections 24, 25, 26, 27 and 28, the number thereof depending upon the desired length of the ladder. VIt is to be noted that said sections, for purposes of illustration, are shown as rectangularly shaped, although I am not limited to such shape. Each section has at its ends connecting with the next succeeding section an upper slot or opening 29 and a lower slot or opening 30. Such slots or openings as shown may be of rectangular or other suitable shape and extend outwardly lof the stile to permit the passage and lodging therein of a cross bar 31 which extends through each of said rungs 32 as shown. Said bar 31 in each rung interconnects the sections of said stiles 22 and 23, preferably at the location where the sections when extended for their respective slots or openings are in engageable alignment. As noted, the rungs will usually correspond with the number of sections so as to facilitate collapsing of the ladder or telescoping of the respective sections in each stile.
With respect to rungs 32, it will be noted that there is provided with the cross bar 31 one or more coil spring members 33 which are fixed at one end to the underside of each rung 32 and at the other end to the cross bar 31, said cross bar being preferably cylindrical in shape to facilitate easy movement of the same into the slots or openings 29 and 30 of the different sections. Each of said bars 31 is provided with at least one bar member 34 which is xed to the bar 31 and extends through an opening 34a from the underside wall of each rung between the stiles. Each rung 32 is furthermore provided with lateraly disposed end slots or openings 35 and 36 at the opposite ends thereof, so that when the stiles 16 and 17 are to be brought together in vertical arrangement, preparatory to collapsing the ladder, the protruding bar 34 will come into contact with the rear face 37 of each opposed rungs 37a on stile 17 so as to force the iiat bar 34 inwardly against the action of springs 33 thereby releasing the cross bar 31 from locking engagement with the upper and lower rung sections, whereupon said sections Will automatically collapse into the lowermost section 28 so as to form a compact unit 38, as shown in Fig. 3. The sections in the stiles 16 will also collapse, because the bar 34 pressing against the rear face 37 of the rungs 37a will push the rungs to the left of stile 16, in Fig. l. Such compact unit can then be readily stored; for instance, in a closet or other small space.
In Figs. 7 to 11, inclusive, I show a rung ladder 39 preferably of tubular construction which has a pair of stiles 40 and 41, each consisting of upwardly extending sections 42, 43, 44 and 45, and downwardly extending sections 46, 47, 48 and 49, protruding from the central sections 50 and 51, respectively, which central sections have interconnecting fixed rungs 52, 53 and 54. The number of upwardly and downwardly extending sections may be varied depending on the desired length of the ladder.
Said central portions 50 and 51, as shown, are of the greatest outside diameter and are intended to support the upwardly extending and downwardly extending telescopic sections above indicated. Each of said sections 42, 43, 44, 45, 46, 47, 48 and 49, is provided at their upper and lower ends with an inner opening or slot 55 as shown, which openings are adapted to come into alignment with the opening of the next successive upper or lower section as the case may be.
Interconnecting each of the sections isa series of rungs 56 fixed to each opposed section, and ,through which extend a pair of bars 57 and 58 normally kept and spread apart, as shown in Fig. Vl0by means ofa tensionfspring member 59, whereby the ends of said bars extend throughV the openings or slots 55 into the section. VIt will be noted Y that said rungs are in the present instance shown as cylindrical and entertain Vthe bars 57v and 58; Each of said bars 57 and 58 has a protruding pin 60 `extending outwardly of theY rungft56 through slots 61 in each rung.
In the event it is desired to collapse the ladder to a condition shown in Fig. 9, the operator of `t-he ladder Vhoused in each of the cross members or rungs. Alstnin accordance with my invention the interlocking .engagingV and disengaging means are spring operableon releasable. The interlocking Vmeans provided in each rung act as stops for the sections affording Sufficient rigidity and sturdiness to the ladder to accommodate thefperson of more than average weight. I furthermore show-the component parts of the ladder as eitherrrrectangular or: cylindrical'in shape; However, I amV not limited to suchshape but may useV any otherV shape inV the formationtofl the Y Y dierent parts of the ladder.Y YSaid ladderis'maderof'relatively light weight metal, such as aluminum, or aluminum alloys, which will aiord sufficient sturdiness ori strength YVto cope with the usual weights of usersl of the ladder.
InY accordance with my invention the sections Vin case of Vdanlage can berreadily replaced. Y Y i Byrmy invention it will be further noted` that I mayV reduce the normal size of therladder'to aboutone-'third Vits original lengthso as to facilitate easy'- and. economic storage when the ladder is not in use. f A ladder ot the type described andillustrated herein can be'easily col.
lapsed or extended tosuitrthe needs of the user.
While preferred embodiments of my invention have been described and illustrated, it is to be understood that modifications as to form, arrangement of parts, and use of materials, may be Ymade without departing from the spirit and scope of my invention as claimed herein.
I claim:
1. Arcollapsible 'step ladder, comprising a plurality ofY stiles, Veachy having a multiplicity of telescopicV sections, and a plurality "of rungs interconnecting the Stiles, each rung having'dispose'd underneath the step portion releasable locking means. extending acrossA the rung for each of the sections, said locking means having protruding means adapted when a pair of said stilestare brought together in closed position to contact the opposed rungs thereon and automatically release the locking means thereon to. permit telescoping of the. sections.. t
2. An extensible step. ladder comprisinga pair of collapsible laddereinhingead connection with each other, each ladder `having a pair of spaced telescopic'stile section, each section containingk a cross rung at Vthe, upper portion thereof, each stile section having a' lateral slot therein at the rung portion so thatwhen the sections'are extended and each successive end comes into contactl with each` other, the respective slots arein relative alignment, said rung members. having tensionedV movable locking bar means adapted to-slidelinto said openings` andhold the sections in extended position Vin the ladder-,and means in connection with the vbar` means adaptedwhenthe ladders are' brought togetheri to. release the rlocking means and permit the sect-ionsvtofbe collapsed'. Y
References; Cited the le of this; .patent Y UNITED sTArEs PATENTSV Y Crumpton Feb. 20,' 19,51l
US511074A 1955-05-25 1955-05-25 Telescopic step or rung ladders Expired - Lifetime US2827216A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US511074A US2827216A (en) 1955-05-25 1955-05-25 Telescopic step or rung ladders

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US511074A US2827216A (en) 1955-05-25 1955-05-25 Telescopic step or rung ladders

Publications (1)

Publication Number Publication Date
US2827216A true US2827216A (en) 1958-03-18

Family

ID=24033362

Family Applications (1)

Application Number Title Priority Date Filing Date
US511074A Expired - Lifetime US2827216A (en) 1955-05-25 1955-05-25 Telescopic step or rung ladders

Country Status (1)

Country Link
US (1) US2827216A (en)

Cited By (38)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2899009A (en) * 1958-08-25 1959-08-11 Roth Milton Folding step ladder
US2923373A (en) * 1957-10-28 1960-02-02 Rol Away Truck Mfg Company Inc Extensible platform truck
US4989692A (en) * 1989-06-16 1991-02-05 Min Liaw S Multi-purpose extendable and retractable ladder
WO1991015651A1 (en) * 1990-04-10 1991-10-17 Safescape Limited Collapsible ladder
US5062499A (en) * 1990-10-10 1991-11-05 Tu Ching Chuan Side rails fastening mechanism for telescopic aluminum step ladders
WO1993002271A1 (en) * 1991-07-18 1993-02-04 Foxdale Limited Extensible ladder
WO1995008689A1 (en) * 1993-09-24 1995-03-30 Luis Blanco Gris New arrangement of steps applicable to dismountable stairs
EP0657614A1 (en) * 1993-12-09 1995-06-14 Fook Khean Wong Convertible ladder assembly
FR2715967A1 (en) * 1994-02-04 1995-08-11 Sgb Services Plc Ladder lock.
US5495915A (en) * 1990-04-10 1996-03-05 Charles A. McDonnell Collapsible ladder
USD388520S (en) * 1996-05-07 1997-12-30 Hercules Products, Inc. Adjustable swimming pool ladder
US5704448A (en) * 1995-07-17 1998-01-06 Jenkins, Jr.; Joseph Robert Modular ladder system
US5738186A (en) * 1994-03-01 1998-04-14 Foxdale Developments Limited Extensible ladder
US5752580A (en) * 1994-03-17 1998-05-19 Jenkins, Jr.; Joseph Robert Modular ladder system
WO1999051848A1 (en) * 1998-04-04 1999-10-14 Eriksson, Per-Olof Collapsible stepladder
US20030221910A1 (en) * 2002-05-30 2003-12-04 Kuo-Ching Huang Multifunctional adjustable ladder assembly
US20040195043A1 (en) * 2001-06-13 2004-10-07 Kjell Johansson Collapsible ladder
US20090078503A1 (en) * 2006-02-07 2009-03-26 Telesteps Ab Collapsible Platform
US20090229918A1 (en) * 2008-03-07 2009-09-17 Wing Enterprises, Inc. Ladders, ladder components and related methods
EP2157276A2 (en) 2008-08-22 2010-02-24 Core Distribution Inc. Extendable and retractable ladder
US20110036666A1 (en) * 2009-08-11 2011-02-17 Rong-Tai Hong Retractable Ladder
US20110240405A1 (en) * 2006-07-27 2011-10-06 Parker Thomas W Tubular access ladder and method
US20120193167A1 (en) * 2011-01-28 2012-08-02 Appropriate Combined Technologies, Llc Telescoping pull-down attic ladder
US20140224585A1 (en) * 2013-02-13 2014-08-14 Wing Enterprises, Incorporated Ladders and related methods
US9016434B2 (en) 2011-02-22 2015-04-28 Wing Enterprises, Inc. Ladders, ladder components and related methods
DE102014104039A1 (en) * 2014-03-24 2015-09-24 Ergobionik Gmbh stepladder
US9416591B2 (en) 2014-12-02 2016-08-16 Core Distribution, Inc. Telescoping ladder with stabilizers
US9580959B2 (en) * 2014-12-02 2017-02-28 Core Distribution, Inc. Foldable ladder
US9863187B2 (en) * 2006-07-27 2018-01-09 Werner Co. Tubular access ladder and method
US10066437B2 (en) * 2016-07-20 2018-09-04 The Boeing Company Staggered step trestle ladder
US10233692B2 (en) * 2014-12-02 2019-03-19 Core Distribution, Inc. Foldable ladder
US10487576B2 (en) 2016-03-04 2019-11-26 Wing Enterprises, Incorporated Adjustment mechanisms, ladders incorporating same and related methods
US20210123302A1 (en) * 2019-10-24 2021-04-29 Core Distribution, Inc. Ladder tripod assembly and system
US11174678B2 (en) 2017-11-08 2021-11-16 Core Distribution, Inc. Locking assembly for a telescoping ladder
US20220025702A1 (en) * 2020-07-23 2022-01-27 Casey Armand Hebert Ladder assembly
USD975317S1 (en) * 2022-09-23 2023-01-10 Yongkang EMJ Industrial & Trade Co., Ltd Ladder
NL2029224B1 (en) 2021-09-22 2023-03-29 Lampe Holding Bv Portable ladder with a stand off device
EP3227517B1 (en) * 2014-12-02 2023-09-27 Core Distribution, Inc. Telescoping ladder

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8987A (en) * 1852-06-01 Fire-escape laddee
US1576625A (en) * 1925-01-14 1926-03-16 Blodgett Arthur Waldron Stepladder
US1712942A (en) * 1927-12-29 1929-05-14 Hiram K Smith Collapsible ladder
US2021494A (en) * 1935-04-30 1935-11-19 Zeman Paul Folding ladder
US2194856A (en) * 1938-04-22 1940-03-26 Kostuk Alexander Ladder
US2542398A (en) * 1945-07-28 1951-02-20 Mary Crumpton Murray Ladder

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8987A (en) * 1852-06-01 Fire-escape laddee
US1576625A (en) * 1925-01-14 1926-03-16 Blodgett Arthur Waldron Stepladder
US1712942A (en) * 1927-12-29 1929-05-14 Hiram K Smith Collapsible ladder
US2021494A (en) * 1935-04-30 1935-11-19 Zeman Paul Folding ladder
US2194856A (en) * 1938-04-22 1940-03-26 Kostuk Alexander Ladder
US2542398A (en) * 1945-07-28 1951-02-20 Mary Crumpton Murray Ladder

Cited By (61)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2923373A (en) * 1957-10-28 1960-02-02 Rol Away Truck Mfg Company Inc Extensible platform truck
US2899009A (en) * 1958-08-25 1959-08-11 Roth Milton Folding step ladder
US4989692A (en) * 1989-06-16 1991-02-05 Min Liaw S Multi-purpose extendable and retractable ladder
US5495915A (en) * 1990-04-10 1996-03-05 Charles A. McDonnell Collapsible ladder
WO1991015651A1 (en) * 1990-04-10 1991-10-17 Safescape Limited Collapsible ladder
US5062499A (en) * 1990-10-10 1991-11-05 Tu Ching Chuan Side rails fastening mechanism for telescopic aluminum step ladders
WO1993002271A1 (en) * 1991-07-18 1993-02-04 Foxdale Limited Extensible ladder
WO1995008689A1 (en) * 1993-09-24 1995-03-30 Luis Blanco Gris New arrangement of steps applicable to dismountable stairs
EP0657614A1 (en) * 1993-12-09 1995-06-14 Fook Khean Wong Convertible ladder assembly
FR2715967A1 (en) * 1994-02-04 1995-08-11 Sgb Services Plc Ladder lock.
US5738186A (en) * 1994-03-01 1998-04-14 Foxdale Developments Limited Extensible ladder
US5752580A (en) * 1994-03-17 1998-05-19 Jenkins, Jr.; Joseph Robert Modular ladder system
US5704448A (en) * 1995-07-17 1998-01-06 Jenkins, Jr.; Joseph Robert Modular ladder system
USD388520S (en) * 1996-05-07 1997-12-30 Hercules Products, Inc. Adjustable swimming pool ladder
WO1999051848A1 (en) * 1998-04-04 1999-10-14 Eriksson, Per-Olof Collapsible stepladder
US20040195043A1 (en) * 2001-06-13 2004-10-07 Kjell Johansson Collapsible ladder
US20030221910A1 (en) * 2002-05-30 2003-12-04 Kuo-Ching Huang Multifunctional adjustable ladder assembly
US6880675B2 (en) * 2002-05-30 2005-04-19 Kuo-Ching Huang Multifunctional adjustable ladder assembly
US20090078503A1 (en) * 2006-02-07 2009-03-26 Telesteps Ab Collapsible Platform
US20110240405A1 (en) * 2006-07-27 2011-10-06 Parker Thomas W Tubular access ladder and method
US9863187B2 (en) * 2006-07-27 2018-01-09 Werner Co. Tubular access ladder and method
US8348015B2 (en) * 2006-07-27 2013-01-08 Werner Co. Tubular access ladder and method
US11788351B2 (en) 2008-03-07 2023-10-17 Little Giant Ladder Systems, Llc Ladders, ladder components and related methods
US9163455B2 (en) 2008-03-07 2015-10-20 Wing Enterprises, Inc. Ladders, ladder components and related methods
US9784033B2 (en) 2008-03-07 2017-10-10 Wing Enterprises, Incorporated Ladders, ladder components and related methods
US8186481B2 (en) 2008-03-07 2012-05-29 Wing Enterprises, Inc. Ladders, ladder components and related methods
US10767416B2 (en) 2008-03-07 2020-09-08 Wing Enterprises, Incorporated Ladders, ladder components and related methods
US20090229918A1 (en) * 2008-03-07 2009-09-17 Wing Enterprises, Inc. Ladders, ladder components and related methods
US12352107B2 (en) 2008-03-07 2025-07-08 Little Giant Ladder Systems, Llc Ladders, ladder components and related methods
US12359508B2 (en) 2008-03-07 2025-07-15 Little Giant Ladder Systems, Llc Ladders, ladder components and related methods
US10753149B2 (en) 2008-08-22 2020-08-25 Core Distribution, Inc. Extendable / retractable ladder
US10053912B2 (en) 2008-08-22 2018-08-21 Core Distribution, Inc. Extendable / retractable ladder
EP2157276A3 (en) * 2008-08-22 2012-05-16 Core Distribution Inc. Extendable and retractable ladder
EP2157276A2 (en) 2008-08-22 2010-02-24 Core Distribution Inc. Extendable and retractable ladder
US20110036666A1 (en) * 2009-08-11 2011-02-17 Rong-Tai Hong Retractable Ladder
US8056679B2 (en) * 2009-08-11 2011-11-15 Rong-Tai Hong Retractable ladder
US8695760B2 (en) * 2011-01-28 2014-04-15 Appropriate Combined Technologies, Llc Telescoping pull-down attic ladder
US20120193167A1 (en) * 2011-01-28 2012-08-02 Appropriate Combined Technologies, Llc Telescoping pull-down attic ladder
US10501990B2 (en) 2011-02-22 2019-12-10 Wing Enterprises, Incorporated Ladders, ladder components and related methods
US11846137B2 (en) 2011-02-22 2023-12-19 Little Giant Ladder Systems, Llc Ladders, ladder components and related methods
US9016434B2 (en) 2011-02-22 2015-04-28 Wing Enterprises, Inc. Ladders, ladder components and related methods
US9422767B2 (en) * 2013-02-13 2016-08-23 Wing Enterprises, Inc. Ladders and related methods
US20140224585A1 (en) * 2013-02-13 2014-08-14 Wing Enterprises, Incorporated Ladders and related methods
DE102014104039B4 (en) 2014-03-24 2019-03-28 Ergobionik Gmbh stepladder
DE102014104039A1 (en) * 2014-03-24 2015-09-24 Ergobionik Gmbh stepladder
US9580959B2 (en) * 2014-12-02 2017-02-28 Core Distribution, Inc. Foldable ladder
US10731413B2 (en) * 2014-12-02 2020-08-04 Core Distribution, Inc. Foldable ladder
US9416591B2 (en) 2014-12-02 2016-08-16 Core Distribution, Inc. Telescoping ladder with stabilizers
EP3227517B1 (en) * 2014-12-02 2023-09-27 Core Distribution, Inc. Telescoping ladder
US20190093428A1 (en) * 2014-12-02 2019-03-28 Core Distribution, Inc. Foldable ladder
US10233692B2 (en) * 2014-12-02 2019-03-19 Core Distribution, Inc. Foldable ladder
US10487576B2 (en) 2016-03-04 2019-11-26 Wing Enterprises, Incorporated Adjustment mechanisms, ladders incorporating same and related methods
US11421475B2 (en) 2016-03-04 2022-08-23 Little Giant Ladder Systems, Llc Adjustment mechanisms, ladders incorporating same and related methods
US10066437B2 (en) * 2016-07-20 2018-09-04 The Boeing Company Staggered step trestle ladder
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
US20210123302A1 (en) * 2019-10-24 2021-04-29 Core Distribution, Inc. Ladder tripod assembly and system
US20220025702A1 (en) * 2020-07-23 2022-01-27 Casey Armand Hebert Ladder assembly
WO2023046760A1 (en) 2021-09-22 2023-03-30 Lampe Holding B.V. Portable ladder with a stand off device
NL2029224B1 (en) 2021-09-22 2023-03-29 Lampe Holding Bv Portable ladder with a stand off device
USD975317S1 (en) * 2022-09-23 2023-01-10 Yongkang EMJ Industrial & Trade Co., Ltd Ladder

Similar Documents

Publication Publication Date Title
US2827216A (en) Telescopic step or rung ladders
US5495915A (en) Collapsible ladder
US3858684A (en) Telescoping ladder
CA2080135C (en) Collapsible ladder
US4457391A (en) Fold-up ladder
EP0135666B1 (en) Convertible fold-up ladder
US4119177A (en) Collapsible ladder
US20090078503A1 (en) Collapsible Platform
US4004393A (en) Adjustable heighth shoring
US3451506A (en) Collapsible ladder
EP0125338A2 (en) Ladder having a plurality of modules
US3269485A (en) Convertible ladder
EP0657614A1 (en) Convertible ladder assembly
US3263773A (en) Inclined collapsible ladder
US3946834A (en) Self storing fire escape ladder
GB2110286A (en) Light and extensible ladder
US4926964A (en) Step/extension ladder
US3208553A (en) Folding ladder
US5685394A (en) Automatic blockading system device for ladders or folding portable stepladder in transversal sense
US3073414A (en) Collapsible ladder
EP2877667B1 (en) Telescopically collapsible fire escape ladder
US3722621A (en) Ladder bench
WO1993002271A1 (en) Extensible ladder
CA1259291A (en) Escape ladder assembly
KR0162705B1 (en) Retractable ladder