US3786899A - Ladder - Google Patents

Ladder Download PDF

Info

Publication number
US3786899A
US3786899A US00174441A US3786899DA US3786899A US 3786899 A US3786899 A US 3786899A US 00174441 A US00174441 A US 00174441A US 3786899D A US3786899D A US 3786899DA US 3786899 A US3786899 A US 3786899A
Authority
US
United States
Prior art keywords
stringers
rungs
ladder
fastening elements
flank
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
US00174441A
Other languages
English (en)
Inventor
H Zenhausern
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
Application granted granted Critical
Publication of US3786899A publication Critical patent/US3786899A/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
    • E06C7/00—Component parts, supporting parts, or accessories
    • E06C7/18—Devices for preventing persons from falling
    • E06C7/181—Additional gripping devices, e.g. handrails
    • E06C7/182—Additional gripping devices, e.g. handrails situated at the top of the ladder
    • E—FIXED CONSTRUCTIONS
    • E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
    • E06C—LADDERS
    • E06C9/00—Ladders characterised by being permanently attached to fixed structures, e.g. fire escapes
    • E06C9/02—Ladders characterised by being permanently attached to fixed structures, e.g. fire escapes rigidly mounted
    • E—FIXED CONSTRUCTIONS
    • E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
    • E06C—LADDERS
    • E06C9/00—Ladders characterised by being permanently attached to fixed structures, e.g. fire escapes
    • E06C9/06—Ladders characterised by being permanently attached to fixed structures, e.g. fire escapes movably mounted
    • E06C9/08—Ladders characterised by being permanently attached to fixed structures, e.g. fire escapes movably mounted with rigid longitudinal members

Definitions

  • a ladder comprises two stringers, a plurality of rungs and fastening elements for fastening said ladder to structure, said fastening elements and said rungs being provided, at their ends with external toothing and the stringers carrying a plurality of shiftable and clampable connecting elements some of which are provided with a blind bores for receiving ends of said rungs and others of which are provided with bores for receiving ends of said fastening elements.
  • LADDER FIELD OF THE INVENTION This invention relates to ladders which can be attached to structures to facilitate climbing thereon.
  • the invention provides a ladder, for attachment to a structure, comprising a plurality of rungs, two stringers and fastening elements, said rungs and said fastening elements being provided at their ends with external toothing and said stringers carrying a number of shiftable and clampable connecting elements some of which elements are provided with at least one blind bore for receiving a free end of one of said rungs and others of which are provided with bores for receiving respective one ends of said fastening elements.
  • the ladder of the invention can be assembled in situ and be made up to a desired size and configuration as desired. It is stable and resistant to corrosion.
  • the stability of the ladder of the invention can be enhanced by the external toothing being formed by a number of circular barb-like ribs, which ribs have an inclined flank directed towards the end of the rungs or stringers and a flank extending perpendicularly to the axis of the rungs or stringers.
  • the rungs, stringers and fastening elements are in the form of steel tubes provided with a coating of polyethylene or aluminium.
  • the rungs, fastening elements or stringers can be made from aluminium tube provided for reinforcement, with internal radially directed webs or cross pieces which extend over their entire length.
  • the rungs and/or fastening elements can carry, on their ends, a respective pressed-in plastic pins or tenons provided with the external toothing.
  • the external toothing can be formed in the polyethylene coating or in an aluminium tube itself.
  • FIG. 1 is a perspective view of a preferred embodiment of ladder conforming to the invention and mounted in a shaft;
  • FIG. 2 is a cross-section through a junction of a rung with a stringer of the ladder of FIG. 1 showing a connecting element thereof;
  • FIG. 3 illustrates, partly in section, a fastening element of the ladder of FIG. 1.
  • the ladder of FIG. 1 comprises a number of rungs 1, two stringers 2 and four fastening elements 3.
  • a number of sleeve-like anchoring elements 5 each of which has a slightly frusto-conically tapered bore which corresponds, in diameter to the fastening elements 3.
  • These elements 5 can be cast integral, for example during construction of the shaft in accordance with a specific arrangement, in which case not-needed sleeves are sealed with a stopper 6 or the sleeves can be subsequently inserted into holes formed in the shaft. In this latter case the sleeves can be provided with barb-like external ribs 7, as shown in'FIG. 3.
  • the fastening elements 3 are fastened by means of connecting elements 10 to the stringers 2.
  • connecting elements 11 connect the rungs 1 to the stringers 2, and one embodiment of connecting element 11 is represented in section in FIG. 2. It possesses a blind bore 12 which is slightly frusto-conically tapered.
  • the bore 12 serves for receiving the one end of a rung 1.
  • Each of the rungs 1 is provided, at its ends, with barb-like toothing in the form of ribs 13 which ensure a secure fit in the bore 12 of the connecting element 11. It is advantageous to seal the hollow end of the rungs 1 in an air-tight and damp-proof manner with a stopper 14.
  • connecting elements 11 possess a continuous bore 15, which is likewise slightly frusto-conically tapered and which has a somewhat greater diameter than the stringer 2. They can thus be displaced, together with the rungs 1, along the stringers 2 to any desired position and can be fastened by means of frusto-conically shaped sleeves such as the sleeve 16 which is pressed into the bore 15. If required, the outer surface of the sleeve 16 and/or the inner surface of the conical bore 15 can additionally be provided with barb-like toothing in the form f ribs 17. if desired, connecting element 11 may have a clamp-like connector structure, as shown with respect to element 10, for cooperation with stringers 2.
  • FIG. 3 a second embodiment of a connecting element which may be used in place of connector or 1 1 is illustrated in which the ends of rungs 1 and fastening elements 3 are provided with a plurality of independent, circular barb-like flanges adapted to directly cooperate with the grooved frusto-conical bore of the connector.
  • the ladder of the invention With the ladder of the invention the possibility is provided of guaranteeing the negotiability of structures provided with it for years to come with great safety. There exists very little danger of breakage as a result of corrosive attacks, and also tearing-out or breakingaway of the fastening elements from the structure is highly unlikely. However, the possibility exists of dismantling the ladder undamaged, by means of suitable tools. Upon the erection of the ladder arrangement, no working with hammer and chisel nor any plaster work whatever is necessary, so that the erection can be effected in the shortest time by unskilled labour.
  • the ladder can have an upper extension for resting on part of a structure above it for extra support.
  • a ladder for attachment to a structure comprising a pair of parallel, spaced continuous stringers, each formed of a single, unbroken tubular element;
  • each of said first connecting means secured in spaced relation about one of said tubular stringers and defining a frusto-conical bore having a plurality of independent circular grooves each having a first flank perpendicular to the axis of said groove and a second flank inclined thereto;
  • each of said rungs having a plurality of independent, circular barb-like ribs formed thereon for establishing a permanent interconnection between said rungs and said stringers upon direct insertion of said rung ends into said first connecting means;
  • anchor means adapted to be permanently attached to the structure and defining a frusto-conical bore having a plurality of independent circular grooves each having a first flank perpendicular to the axis of said groove and a second flank inclined thereto;
  • each of said connecting means secured in spaced relation about one of said tubular stringers and defining a frusto-conical bore having a plurality of independent circular grooves each having a first flank perpendicular to the axis of said groove and a second flank inclined thereto;
  • each of said fastening elements having a plurality of independent, circular barb-like ribs formed thereon for establishing a permanent interconnection between said stringers and the structure upon direct insertion of said fastener element ends into said second connecting means and said anchor means.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Ladders (AREA)
US00174441A 1970-08-27 1971-08-24 Ladder Expired - Lifetime US3786899A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH1296470A CH505276A (de) 1970-08-27 1970-08-27 In einem Mauerwerk verankerte Steigeinrichtung

Publications (1)

Publication Number Publication Date
US3786899A true US3786899A (en) 1974-01-22

Family

ID=4388033

Family Applications (1)

Application Number Title Priority Date Filing Date
US00174441A Expired - Lifetime US3786899A (en) 1970-08-27 1971-08-24 Ladder

Country Status (6)

Country Link
US (1) US3786899A (enExample)
BE (1) BE771791A (enExample)
CH (1) CH505276A (enExample)
DE (1) DE2137963C3 (enExample)
FR (1) FR2105881A5 (enExample)
NO (1) NO131252C (enExample)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5282339A (en) * 1992-04-27 1994-02-01 Dabico Inc. Aircraft servicing pit with retractable ladder
US5743355A (en) * 1996-07-31 1998-04-28 Mcdonnell; Charles A. Retractable ladder
GB2380759A (en) * 2001-10-06 2003-04-16 Channel Covers Ltd A ladder mounting assembly for securing a ladder to a wall of an access chamber
US20070125602A1 (en) * 2001-03-09 2007-06-07 Gerard Marbach Ladder, in particular swimming-pool ladder
US7549256B1 (en) * 2006-04-10 2009-06-23 Watkins Donald J Modular window well and associated accessories
US8235174B1 (en) * 2009-09-24 2012-08-07 Pelini Mark F Jack plate ladder
US20120285771A1 (en) * 2010-01-13 2012-11-15 Hiram (Wa) Pty Ltd Ladderway system for underground raises
US8511430B1 (en) * 2009-09-24 2013-08-20 Mark F. Pelini Jack plate ladder lock with bushing
US20150107937A1 (en) * 2009-01-07 2015-04-23 Polygroup Macau Limited (Bvi) Pool ladder safety system
US10030352B2 (en) * 2013-07-22 2018-07-24 Ronald ARMSTRONG Manhole frame with one or more handholds
US20200199936A1 (en) * 2018-12-21 2020-06-25 Timothy Nakari Roof rack side ladder

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3430848A1 (de) * 1984-08-22 1986-03-06 Heinrich Urdorf Zürich Zenhäusern Steigbuegel fuer die befestigung in wandflaechen
FR2588912B1 (fr) * 1985-10-23 1988-05-13 Materiel Securite Urb Echelon de scellement et son procede de fixation
WO1988005775A1 (en) * 1987-01-30 1988-08-11 Sandoz-Erfindungen Verwaltungsgesellschaft M.B.H. Novel xanthine derivatives
DE20106892U1 (de) 2001-04-20 2001-06-28 Stahlbau Kurt Klatetzki GmbH & Co.KG, 58739 Wickede Schachteinstieg und Steigleiter
CN104727743B (zh) * 2015-03-10 2017-06-09 国家电网公司 一种爬梯

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US267031A (en) * 1882-11-07 spelmax
US438768A (en) * 1890-10-21 Lamp-bracket
US3443351A (en) * 1966-09-06 1969-05-13 Seibu Gomu Kagaku Kk Device for fitting fenders to structures and the like
US3453796A (en) * 1966-09-17 1969-07-08 Siegfried Gutmann Carrier for concrete castings

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US267031A (en) * 1882-11-07 spelmax
US438768A (en) * 1890-10-21 Lamp-bracket
US3443351A (en) * 1966-09-06 1969-05-13 Seibu Gomu Kagaku Kk Device for fitting fenders to structures and the like
US3453796A (en) * 1966-09-17 1969-07-08 Siegfried Gutmann Carrier for concrete castings

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5282339A (en) * 1992-04-27 1994-02-01 Dabico Inc. Aircraft servicing pit with retractable ladder
US5743355A (en) * 1996-07-31 1998-04-28 Mcdonnell; Charles A. Retractable ladder
US20070125602A1 (en) * 2001-03-09 2007-06-07 Gerard Marbach Ladder, in particular swimming-pool ladder
GB2380759A (en) * 2001-10-06 2003-04-16 Channel Covers Ltd A ladder mounting assembly for securing a ladder to a wall of an access chamber
US7549256B1 (en) * 2006-04-10 2009-06-23 Watkins Donald J Modular window well and associated accessories
US20150107937A1 (en) * 2009-01-07 2015-04-23 Polygroup Macau Limited (Bvi) Pool ladder safety system
US9394744B2 (en) * 2009-01-07 2016-07-19 Polygroup Macau Limited (Bvi) Pool ladder safety system
US8511430B1 (en) * 2009-09-24 2013-08-20 Mark F. Pelini Jack plate ladder lock with bushing
US8235174B1 (en) * 2009-09-24 2012-08-07 Pelini Mark F Jack plate ladder
US20120285771A1 (en) * 2010-01-13 2012-11-15 Hiram (Wa) Pty Ltd Ladderway system for underground raises
US9038775B2 (en) * 2010-01-13 2015-05-26 Hiram (Wa) Pty Ltd Ladderway system for underground raises
US10030352B2 (en) * 2013-07-22 2018-07-24 Ronald ARMSTRONG Manhole frame with one or more handholds
US10030350B2 (en) * 2013-07-22 2018-07-24 Ronald ARMSTRONG Manhole frame with one or more handholds
US10030351B2 (en) * 2013-07-22 2018-07-24 Ronald ARMSTRONG Manhole frame with one or more handholds
US20200199936A1 (en) * 2018-12-21 2020-06-25 Timothy Nakari Roof rack side ladder
US10927599B2 (en) * 2018-12-21 2021-02-23 Timothy Nakari Roof rack side ladder

Also Published As

Publication number Publication date
BE771791A (fr) 1971-12-31
CH505276A (de) 1971-03-31
FR2105881A5 (enExample) 1972-04-28
NO131252B (enExample) 1975-01-20
DE2137963C3 (de) 1979-07-26
DE2137963A1 (de) 1972-03-02
DE2137963B2 (de) 1978-11-23
NO131252C (enExample) 1975-04-30

Similar Documents

Publication Publication Date Title
US3786899A (en) Ladder
US7424792B1 (en) Positively retained cap for use on an encapsulated anchor of a post-tension anchor system
US5271199A (en) Post tensioning anchor system
US4869342A (en) Drive in manhole step
US3881572A (en) Tube connection, e. g. for a ladder
US20180238367A1 (en) Wedge Anchor Setting Tool and Method
US4302131A (en) Anchor elements
EP0006703B1 (en) Ground anchor, method of making a ground anchor and corrosion-proof sleeve for use in said method
US3481571A (en) Stabilizer for plumbing pipes
US4528791A (en) Anchorage for climbing irons in parts of concrete or the like
US6925769B2 (en) Concrete jar step insert
US1449236A (en) Method of providing anchorages
US20050076605A1 (en) Self-supporting framework modular structure
JP4440136B2 (ja) 手摺支柱の取付工法
US20040016598A1 (en) Scaffold ladder
KR102199131B1 (ko) 영구형 앵커
US4008550A (en) Device for setting sockets for swimming pool ladders
US776668A (en) Scaffold.
KR20090054515A (ko) 안전폭목
CN221481188U (zh) 一种装配式建筑铝型材
CN217924470U (zh) 一种具有防雷功能的装配式女儿墙结构
KR100224647B1 (ko) 유리온실 철구조물 h빔 연결부속
JP2641817B2 (ja) 木製バルコニー等用手摺柱基礎金具笠木上取付方法
KR20000074520A (ko) 건물외장용 석판 연결 고정구
KR0128809B1 (ko) 계단난간용지주구조물과이를이용한난간시공방법