GB392940A - Improvements in loft ladders and the like - Google Patents
Improvements in loft ladders and the likeInfo
- 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
Links
Classifications
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04F—FINISHING WORK ON BUILDINGS, e.g. STAIRS, FLOORS
- E04F11/00—Stairways, ramps, or like structures; Balustrades; Handrails
- E04F11/02—Stairways; Layouts thereof
- E04F11/04—Movable stairways, e.g. of loft ladders which may or may not be concealable or extensible
- E04F11/06—Movable stairways, e.g. of loft ladders which may or may not be concealable or extensible collapsible, e.g. folding, telescopic
- E04F11/068—Movable stairways, e.g. of loft ladders which may or may not be concealable or extensible collapsible, e.g. folding, telescopic telescopic
Landscapes
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Ladders (AREA)
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.
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)
| 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 |
-
1931
- 1931-11-26 GB GB32831/31A patent/GB392940A/en not_active Expired
Cited By (2)
| 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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