GB2413148A - Loft ladder assembly - Google Patents

Loft ladder assembly Download PDF

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Publication number
GB2413148A
GB2413148A GB0408475A GB0408475A GB2413148A GB 2413148 A GB2413148 A GB 2413148A GB 0408475 A GB0408475 A GB 0408475A GB 0408475 A GB0408475 A GB 0408475A GB 2413148 A GB2413148 A GB 2413148A
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GB
Grant status
Application
Patent type
Prior art keywords
ladder
carriage
loft
mounting bracket
assembly
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.)
Withdrawn
Application number
GB0408475A
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GB0408475D0 (en )
Inventor
Per-Olof Eriksson
Christer Johansson
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.)
TELESTEPS AB
Original Assignee
TELESTEPS AB
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

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Classifications

    • EFIXED CONSTRUCTIONS
    • E06DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
    • E06CLADDERS
    • E06C1/00Ladders in general
    • E06C1/02Ladders in general with rigid longitudinal member or members
    • E06C1/04Ladders for resting against objects, e.g. walls poles, trees
    • E06C1/08Ladders for resting against objects, e.g. walls poles, trees multi-part
    • E06C1/12Ladders for resting against objects, e.g. walls poles, trees multi-part extensible, e.g. telescopic
    • E06C1/125Ladders for resting against objects, e.g. walls poles, trees multi-part extensible, e.g. telescopic with tubular longitudinal members nested within each other
    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04FFINISHING WORK ON BUILDINGS, e.g. STAIRS, FLOORS
    • E04F11/00Stairways, ramps, or like structures; Balustrades; Handrails
    • E04F11/02Stairways; Layouts thereof
    • E04F11/04Movable stairways, e.g. of loft ladders which may or may not be concealable or extensible
    • E04F11/06Movable stairways, e.g. of loft ladders which may or may not be concealable or extensible collapsible, e.g. folding, telescopic
    • E04F11/062Movable stairways, e.g. of loft ladders which may or may not be concealable or extensible collapsible, e.g. folding, telescopic folding

Abstract

A loft ladder assembly (10) which comprises a telescopically collapsible ladder (12) and frame (14) for mounting the ladder (12) within a hatch opening. The frame (14) comprises mounting bracket (14a) to be secured in use to the hatch opening, to which bracket (14a) the uppermost section of the ladder (12) is pivotably connected, and carriage (14b) pivotably connected to the mounting bracket (14a) for supporting the wight of the ladder (12) in its stowage position and preventing it from extending unintentionally. The frame (14) may have hooks (22) for receiving lugs (24) projecting laterally from the lowermost section of the ladder (12). The carriage (14b) may be connected to the mounting bracket (14a) by at least one toggle spring (16a) urging the carriage into stowage position and away from the ladder respectively when collapsing or extending the ladder (12). The rungs can have locking pins with biassing springs which push the pins laterally into holes in the stiles of the ladder (12).

Description

LOFT LADDER ASSEMBLY

The present invention relates to a loft ladder assembly.

Hatch doors are commonly provided in a ceiling to allow access to the loft or roof space of a building. Loft ladders are also known which are stored in the roof space and which are deployed by being pulled down after the hatch door has lo been opened.

Conventional loft ladders are usually of the expendable type. By this it is meant that the ladder is formed of two (or sometimes three) ladder sections arranged in different planes, which can slide over one another and can be locked to each other in a stacked and in an extended position. Even after the sections have been stacked, they are longer than the hatch door. Consequently, to stow away the ladder, it has first to be raised into the loft and then pivoted for its lower end to be able to pass through the hatch. The stacked ladder is normally pivoted about an axis which is near its centre so that the ladder is nearly balanced. As a result, the ladder tends to stay in its horizontal position in the loft when the hatch door is opened and, to deploy it, a user must first pivot its lower end of the hatch and then releases its various catches manually to allow it to be extended to reach the floor.

Because such ladders are not very compact, even in their stacked condition, they have the disadvantage of taking up roof space. It is therefore preferable to form the ladder as a telescopically collapsible ladder where the stiles are formed of sections that collapse into one another, as described for example in EP 0527766. Such a ladder is more compact than an expendable ladder when it is collapsed and can be made sufficiently small to fit entirely within the hatch opening. r - 2 -

However, if the top rung of a telescopically collapsible ladder is pivoted on one side of the hatch opening, it will tend to drop and extend itself under the action of its own weight as soon as the hatch door is opened. This could cause injury to an unsuspecting user.

The present invention seeks therefore to provide a loft ladder assembly that can fit within a hatch opening without taking up loft space but can be deployed and stowed away lo simply and safely.

According to the present invention, there is provided a loft ladder assembly which comprises a telescopically collapsible ladder in combination with a frame for mounting IS the ladder within a hatch opening, the frame comprising a mounting bracket to be secured in use to the hatch opening, to which bracket the uppermost section of the ladder is pivotably connected, and a carriage pivotably connected to the mounting bracket for supporting the weight of the ladder in its stowage position and preventing the ladder from extending unintentionally.

To prevent the ladder from extending under the action of its own weight, the carriage may be provided with means for releasably engaging the lowermost section of the ladder.

The latter means may suitably comprise a pair of hooks for receiving lugs projecting laterally from the lowermost section of the ladder.

Preferably, the carriage is connected to the mounting bracket by means of at least one spring urging the carriage into the stowage position against the action of the weight of the ladder. Conveniently, each spring should be connected to the mounting bracket and the carriage in such a manner as to act as an over-centre toggle spring, so as to urge the carriage away from the ladder when the latter is deployed. - 3

The collapsible ladder is preferably constructed in the manner taught by EP 0527766. In particular, the ladder may have locking pins built into the rungs that are spring biases to move laterally outwards into holes formed in the stiles to lock the sections of the stiles together when the ladder is in its extended position, the locking pins for the next higher section of the ladder being retracted as the rung carrying the locking pins approaches the rung beneath it. When constructed in this manner, the ladder will open naturally from the top down when its lowermost section is released from the carriage and it will collapse in sequence from the lowermost section up as it is raised into its stowage position.

The invention will now be described further, by way of example, with reference to the accompanying drawings, in which: Fig. 1 is a perspective view of a loft ladder assembly of the present invention it its stowage position, Fig. 2 is a front view of the loft ladder assembly in Fig. 1 with the carriage lowered into a vertical position, Fig. 3 is a side view of a detail of the loft ladder assembly in the same position as shown in Fig. 2, and Fig. 4 is a view similar to that of Fig. 3 with the ladder in its deployed position.

The loft ladder assembly 10 shown in Figure 2 comprises a telescopically collapsible ladder 12 and a frame 14 for mounting the ladder in a hatch opening. The frame 14 is formed of a mounting bracket 14a and a carriage 14b pivotable relative to the mounting bracket 14a between a horizontal position shown in Fig. 1 and a vertical position shown in Figs. 2, 3 and 4. Two coil springs 16a and 16b act as toggle springs, as will be described below, to spring bias the carriage 14b into its two end positions. - 4

The ladder 12 is constructed in the same manner as a conventional telescopic ladder which is currently commercially available under the trademark Telesteps.

Whilst such a construction of the ladder is preferred, it is not fundamental to the present invention and it will not therefore be described in detail in the present context. For further details on the internal construction of the ladder 12, reference may be made to EP 0527766.

lo The Telesteps ladder is preferred because it collapses from the bottom upwards and not from the top downwards. In particular, the ladder has locking pins built into its rungs, which are spring biased to move laterally outwards into holes formed in the stiles in order to lock the sections of the stiles together when the ladder is in its extended position. As two rungs come together, the lower rungs presses on two levers 26 (see Fig. 4) which depend from the upper rung to cause the locking pins formed in the upper rung to be retracted from the stiles. This now allows the next higher section of the ladder to be collapsed and the process repeats until all the sections are collapsed from bottom upwards.

Each of the rungs of the ladder have two laterally projecting lugs 24 which engage in hooks 22 projecting from the carriage 14b. After the ladder has been fully collapsed, the lugs 24 lowermost rung can be lifted onto the hooks 22 and this prevents the ladder from extending under the action of its own weight.

The uppermost section of the ladder is pivoted relative to the mounting bracket 14a about pins 28 passing two limbs that project from the mounting bracket 14a. Similarly, the carriage 14b is pivoted about pins 18 passing through two short ears 30 that project from the mounting bracket 14a. - 5

The springs 16a and 16b are connected to bracket 14a and the carriage 14b in such a manner that as the carriage pivots downwards from the horizontal position shown in Fig. 1 to the vertical position shown in Fig. 2, it passes through an over centre position in which the ends of the spring and the pivot pins 18 lie in a straight line. In this position, the length of the spring is maximum and a force has to be applied to the carriage to move the carriage towards this position, as the position is approached in either direction. In other words, the springs 16a and 16b have a toggle action forcing the carriage 14b away from the over centre position. The carriage is thus stably held by the springs 16a and 16b in both the horizontal and the vertical position.

In use, the ladder assembly is fixed by securing the mounting bracket 14a by bolts or screws to the ceiling joists surrounding and defining the hatch opening. When the hatch door (not shown) is opened by being hinged or removed, the loft ladder assembly will be found in the hatch opening in its configuration shown in Fig. 1. In this state, the springs apply a moment to the carriage 14b which is slightly greater than the moment of the combined weights of the ladder 12 and the carriage 14b, so that the loft ladder assembly will remain in the hatch opening after the hatch door has been opened.

To deploy the ladder, the carriage 14b is pivoted downwards against the action of the springs 16a and 16b by pulling down on a strap 32. This operation does not require much effort because of the leverage afforded by the carriage 14b. The carriage is pivoted past the over centre position to the position shown in Figs. 2 and 3, from which it will be seen that the line of action of the springs 16a and 16b has moved to the opposite side of the pins 18 so that the carriage 14b will now remain stably in its vertical position without assistance from the weight of the ladder 12.

As can be seen from Figs. 2 and 3, when the ladder is stowed away, there remains a distance between its top two rungs. This allows the user to lift the entire ladder and thereby disengage the lugs 24 from the hooks 22. Once the weight of the ladder 12 is no longer supported by the hooks 22, it will extend naturally from the top down as can be seen from Fog. 4. This allows the user to pull the ladder 12 away from the carriage 14b and to extend until it reaches the ground and is inclined at a safe and comfortable angle.

To stow away the ladder, the above procedure is essentially reversed. First, after using the levers 26 to release the locking pins of the lowermost rung of the ladder, the lowermost section of the ladder is raised. As its rung reaches the next higher rungs, it will automatically release the locking pins of the next higher section to allow the entire ladder to be collapsed.

With all the sections of the ladder 12 collapsed against one another, the lugs 24 of the lowermost section can be raised onto the hooks 22 whereupon the weight of the ladder will be fully supported by the carriage 14b. While holding the strap 32, the carriage can now be pivoted towards its horizontal position and once it passes the over centre position the strap is used to restrain it so that it can be returned gently to its stowage position of Fig. 1.

The hatch door can then be replaced.

The person skilled in the art will appreciate that various modifications may be made to the described loft ladder assembly without departing from the scope of the invention as set out in the appended claims. For example, the carriage 14b may carry or be connected to the hatch door. Furthermore, in place of springs, one could use a catch to hold the carriage in its raised position. - 7

Claims (7)

1. A loft ladder assembly which comprises a telescopically collapsible ladder in combination with a frame for mounting the ladder within a hatch opening, the frame comprising a mounting bracket to be secured in use to the hatch opening, to which bracket the uppermost section of the ladder is pivotably connected, and a carriage pivotably connected to the mounting bracket for supporting the weight lo of the ladder in its stowage position and preventing the ladder from extending unintentionally.
2. A loft ladder assembly as claimed in claim 1, wherein, in order to prevent the ladder from extending under the action of its own weight, the carriage is provided with means for releasably engaging the lowermost section of the ladder.
3. A loft ladder assembly as claimed in claim 2, wherein the means for releasably engaging the lowermost section of the ladder comprise a pair of hooks for receiving lugs projecting laterally from the lowermost section of the ladder.
4. A loft ladder assembly as claimed in any preceding claim, wherein the carriage is connected to the mounting bracket by means of at least one spring urging the carriage into the stowage position against the action of the weight of the ladder.
5. A loft ladder assembly as claimed in claim 4, wherein each spring is connected to the mounting bracket and to the carriage in such a manner as to act as an over centre toggle spring, so as to urge the carriage away from the ladder when the latter is deployed. - 8 -
6. A loft ladder assembly as claimed in any preceding claim, wherein the ladder has locking pins built into the rungs, which pins are spring biases to move laterally outwards into holes formed in the stiles in order to lock the sections of the stiles together when the ladder is in its extended position, the locking pins for the next higher section of the ladder being retracted as the rung carrying the locking pins approaches the rung beneath it.
lo
7. A loft ladder assembly constructed and adapted to operate substantially as hereinbefore described with reference to and as illustrated in the accompanying drawings.
GB0408475A 2004-04-16 2004-04-16 Loft ladder assembly Withdrawn GB2413148A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB0408475A GB2413148A (en) 2004-04-16 2004-04-16 Loft ladder assembly

Applications Claiming Priority (12)

Application Number Priority Date Filing Date Title
GB0408475A GB2413148A (en) 2004-04-16 2004-04-16 Loft ladder assembly
PCT/SE2005/000550 WO2005100716A1 (en) 2004-04-16 2005-04-15 Loft ladder assembly
DK05733732T DK2102429T3 (en) 2004-04-16 2005-04-15 Ceiling Stig Unit
AT05733732T AT519000T (en) 2004-04-16 2005-04-15 Loft ladder assembly
AU2005233496A AU2005233496B2 (en) 2004-04-16 2005-04-15 Loft ladder assembly
JP2007508305A JP2007532809A (en) 2004-04-16 2005-04-15 Attic ladder assembly
US11578525 US20070234654A1 (en) 2004-04-16 2005-04-15 Loft Ladder Assembly
ES05733732T ES2370645T3 (en) 2004-04-16 2005-04-15 Loft ladder assembly.
NZ55032305A NZ550323A (en) 2004-04-16 2005-04-15 Loft ladder assembly with telescopic rungs and a pivoting frame to attach it to the loft entrance
CN 200580017275 CN100447371C (en) 2004-04-16 2005-04-15 Loft ladder assembly
CA 2562409 CA2562409C (en) 2004-04-16 2005-04-15 Loft ladder assembly
EP20050733732 EP2102429B1 (en) 2004-04-16 2005-04-15 Loft ladder assembly

Publications (2)

Publication Number Publication Date
GB0408475D0 true GB0408475D0 (en) 2004-05-19
GB2413148A true true GB2413148A (en) 2005-10-19

Family

ID=32320920

Family Applications (1)

Application Number Title Priority Date Filing Date
GB0408475A Withdrawn GB2413148A (en) 2004-04-16 2004-04-16 Loft ladder assembly

Country Status (9)

Country Link
US (1) US20070234654A1 (en)
EP (1) EP2102429B1 (en)
JP (1) JP2007532809A (en)
CN (1) CN100447371C (en)
CA (1) CA2562409C (en)
DK (1) DK2102429T3 (en)
ES (1) ES2370645T3 (en)
GB (1) GB2413148A (en)
WO (1) WO2005100716A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20110240405A1 (en) * 2006-07-27 2011-10-06 Parker Thomas W Tubular access ladder and method
US20140190766A1 (en) * 2006-07-27 2014-07-10 Thomas W. Parker Tubular access ladder and method

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008074795A1 (en) 2006-12-20 2008-06-26 Boehringer Ingelheim International Gmbh Sulfated benzimidazolone derivatives having mixed serotonine receptor affinity
US8555555B2 (en) * 2010-03-27 2013-10-15 Michael Cardwell Automatic retractable hatch guard
US8695760B2 (en) * 2011-01-28 2014-04-15 Appropriate Combined Technologies, Llc Telescoping pull-down attic ladder
CN102444247A (en) * 2011-09-13 2012-05-09 宁波市鄞州千峰机械科技有限公司 Gentle slope fluctuating stair special for classroom building
CN104746816A (en) * 2013-12-31 2015-07-01 德胜(苏州)洋楼有限公司 Concealed storage staircase for wooden house
US20150183308A1 (en) * 2014-01-02 2015-07-02 Gloria M. Buley Roof hatch system
GB2532423A (en) * 2014-11-18 2016-05-25 Andrew Beard Michael A cantilever mounted access device
GB2557286B (en) * 2016-12-05 2018-12-19 Vincent Cole Geoffrey A Collapsible Ladder Apparatus

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB496612A (en) * 1936-11-14 1938-12-02 Ursula Gleinser Improvements in collapsible loft stairs
GB1531084A (en) * 1975-02-14 1978-11-01 Monnerie G Loft ladders
GB2263932A (en) * 1992-02-01 1993-08-11 Telesteps Limited Loft ladder.
US5495915A (en) * 1990-04-10 1996-03-05 Charles A. McDonnell Collapsible ladder
AT400737B *
DE19717207C1 (en) * 1997-04-24 1998-12-10 Columbus Treppen Gmbh Extendible ladder for loft trap door

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US1823510A (en) * 1929-03-27 1931-09-15 Peters Extension ladder hook
US2907401A (en) * 1956-10-23 1959-10-06 Wagner Johann Folding stairs
US3051261A (en) * 1960-07-18 1962-08-28 Wel Bilt Products Company Adjustable stairs
US3169603A (en) * 1963-02-21 1965-02-16 Sr John J Amic Access ladder
US3490557A (en) * 1967-07-07 1970-01-20 Ralph J Auciello Adjustable ladder construction for fire escape platforms and the like
US3653463A (en) 1970-06-22 1972-04-04 E T Hannan & Associates Inc Collapsible ladder arrangement
US4180142A (en) * 1978-05-25 1979-12-25 Rocco Bruno, Jr Emergency escape openable skylight
EP0527766B1 (en) 1990-04-10 1996-06-05 Bertschi, Bruno Collapsible ladder
CN2571986Y (en) 2002-09-25 2003-09-10 王国华 Telescopic ladder

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT400737B *
GB496612A (en) * 1936-11-14 1938-12-02 Ursula Gleinser Improvements in collapsible loft stairs
GB1531084A (en) * 1975-02-14 1978-11-01 Monnerie G Loft ladders
US5495915A (en) * 1990-04-10 1996-03-05 Charles A. McDonnell Collapsible ladder
GB2263932A (en) * 1992-02-01 1993-08-11 Telesteps Limited Loft ladder.
DE19717207C1 (en) * 1997-04-24 1998-12-10 Columbus Treppen Gmbh Extendible ladder for loft trap door

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
US20140190766A1 (en) * 2006-07-27 2014-07-10 Thomas W. Parker Tubular access ladder and method
US9863187B2 (en) * 2006-07-27 2018-01-09 Werner Co. Tubular access ladder and method

Also Published As

Publication number Publication date Type
CN100447371C (en) 2008-12-31 grant
WO2005100716A1 (en) 2005-10-27 application
EP2102429B1 (en) 2011-08-03 grant
CN1997800A (en) 2007-07-11 application
CA2562409A1 (en) 2005-10-27 application
EP2102429A1 (en) 2009-09-23 application
US20070234654A1 (en) 2007-10-11 application
GB0408475D0 (en) 2004-05-19 application
DK2102429T3 (en) 2011-10-24 grant
CA2562409C (en) 2012-08-07 grant
ES2370645T3 (en) 2011-12-21 grant
JP2007532809A (en) 2007-11-15 application

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Legal Events

Date Code Title Description
COOA Change in applicant's name or ownership of the application

Owner name: TELESTEPS AB

Free format text: FORMER APPLICANT(S): ERIKSSON, PER-OLOF ;JOHANSSON, CHRISTER

WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)