US3786899A - Ladder - Google Patents
Ladder Download PDFInfo
- 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
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)
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 (de) |
BE (1) | BE771791A (de) |
CH (1) | CH505276A (de) |
DE (1) | DE2137963C3 (de) |
FR (1) | FR2105881A5 (de) |
NO (1) | NO131252C (de) |
Cited By (11)
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)
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)
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 |
-
1970
- 1970-08-27 CH CH1296470A patent/CH505276A/de not_active IP Right Cessation
-
1971
- 1971-07-29 DE DE2137963A patent/DE2137963C3/de not_active Expired
- 1971-08-18 FR FR7130089A patent/FR2105881A5/fr not_active Expired
- 1971-08-24 US US00174441A patent/US3786899A/en not_active Expired - Lifetime
- 1971-08-26 BE BE771791A patent/BE771791A/xx unknown
- 1971-08-26 NO NO3174/71A patent/NO131252C/no unknown
Patent Citations (4)
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)
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 |
---|---|
NO131252B (de) | 1975-01-20 |
DE2137963C3 (de) | 1979-07-26 |
FR2105881A5 (de) | 1972-04-28 |
DE2137963A1 (de) | 1972-03-02 |
DE2137963B2 (de) | 1978-11-23 |
BE771791A (fr) | 1971-12-31 |
CH505276A (de) | 1971-03-31 |
NO131252C (de) | 1975-04-30 |
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