GB392940A - Improvements in loft ladders and the like - Google Patents

Improvements in loft ladders and the like

Info

Publication number
GB392940A
GB392940A GB32831/31A GB3283131A GB392940A GB 392940 A GB392940 A GB 392940A GB 32831/31 A GB32831/31 A GB 32831/31A GB 3283131 A GB3283131 A GB 3283131A GB 392940 A GB392940 A GB 392940A
Authority
GB
United Kingdom
Prior art keywords
ladder
loft
plug
secured
upper section
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
Application number
GB32831/31A
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.)
LOFT LADDERS Ltd
PERCY HAROLD GORHAM
Original Assignee
LOFT LADDERS Ltd
PERCY HAROLD GORHAM
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 LOFT LADDERS Ltd, PERCY HAROLD GORHAM filed Critical LOFT LADDERS Ltd
Priority to GB32831/31A priority Critical patent/GB392940A/en
Publication of GB392940A publication Critical patent/GB392940A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • E04F11/068Movable stairways, e.g. of loft ladders which may or may not be concealable or extensible collapsible, e.g. folding, telescopic telescopic

Abstract

392,940. Loft ladders. LOFT LADDERS, Ltd., Broadway Works, Bromley, Kent, and GORHAM, P. H., 5, King William Street, Greenwich, London. Nov. 26,1931, No. 32831. [Class 20 (ii).] Relates to counterbalancing means for loft ladders of the kind which are adapted to be raised and to be stored within the loft when not in use. According to the invention, the ladder is combined with a spring or a series of springs adapted for linear stress movements. The raising and lowering of the ladder may involve the movement of the ladder as a rigid whole, or the ladder may comprise a number of telescopic or sliding sections, or it may be of the lazytongs type. In the form shown, the ladder 1, Fig. 1, comprises two sliding sections, the upper section of which is connected to the loft floor by pivoted rods 3. A tube 5, Fig. 2, closed at one end by a plug 6 is arranged behind the ladder and to one side thereof and is connected to a tread 16 by an extension 15 of the plug. This tube houses a helical spring 8 which extends between the plug 6 and a movable plunger 9. A chain 7 is secured to the plunger and is led through the plug 6, around a pulley 12 and thence to an anchoring point 17 on the loft floor adjacent the loft opening 2. The pulley 12 is mounted upon a bracket 13 which is secured to the tube 5. In operation the spring is compressed by the pull on the chain 7 when the ladder is lowered and the gravity forces acting on the ladder are thereby counterbalanced. The side rails of the ladder are guided in known manner between rollers and flanged plates pivoted coaxially with the rollers. The loft opening 2 is closed by an automatically latched trap-door 4 which is connected to the upper section of the ladder. In a modification, two chains 7 are anchored one to each of the side rails of the upper section and are connected to linear springs in two tubes which are secured to the loft floor. The lower sliding section of the ladder is independently balanced by similar means, the tubes being secured to the side rails of the upper section and the chains being anchored to the lower section.
GB32831/31A 1931-11-26 1931-11-26 Improvements in loft ladders and the like Expired GB392940A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB32831/31A GB392940A (en) 1931-11-26 1931-11-26 Improvements in loft ladders and the like

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB32831/31A GB392940A (en) 1931-11-26 1931-11-26 Improvements in loft ladders and the like

Publications (1)

Publication Number Publication Date
GB392940A true GB392940A (en) 1933-05-26

Family

ID=10344642

Family Applications (1)

Application Number Title Priority Date Filing Date
GB32831/31A Expired GB392940A (en) 1931-11-26 1931-11-26 Improvements in loft ladders and the like

Country Status (1)

Country Link
GB (1) GB392940A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9422769B2 (en) 2013-11-08 2016-08-23 Embraer S.A. Force-balancing mechanisms especially useful for assisted lifting/lowering of aircraft stairs
CN107063023A (en) * 2016-07-29 2017-08-18 上海市建筑装饰工程集团有限公司 Three-dimensional lofting platform

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9422769B2 (en) 2013-11-08 2016-08-23 Embraer S.A. Force-balancing mechanisms especially useful for assisted lifting/lowering of aircraft stairs
CN107063023A (en) * 2016-07-29 2017-08-18 上海市建筑装饰工程集团有限公司 Three-dimensional lofting platform

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