GB453969A - Improvements relating to spring balanced loft ladders - Google Patents
Improvements relating to spring balanced loft laddersInfo
- Publication number
- GB453969A GB453969A GB1827235A GB1827235A GB453969A GB 453969 A GB453969 A GB 453969A GB 1827235 A GB1827235 A GB 1827235A GB 1827235 A GB1827235 A GB 1827235A GB 453969 A GB453969 A GB 453969A
- Authority
- GB
- United Kingdom
- Prior art keywords
- spring
- chain
- attached
- ladder
- loft
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Devices Affording Protection Of Roads Or Walls For Sound Insulation (AREA)
Abstract
453,969. Loft - ladders. LOFT LADDERS, Ltd., Broadway Works, Bromley, and GORHAM, P. H., 25, Degema Road, Chislehurst, both in Kent. June 26, 1935, No. 18272. Addition to 392,940. [Class 20 (ii)] A loft-ladder according to the parent Specification is now provided with reduction gearing between the counterbalancing spring and the chain or the like connected to the ladder so that a comparatively short spring may be employed. In the construction shown, the chain 4, connected at one end to the plunger 3 arranged behind the spring 1, is passed around a pulley 5 and attached to the block 6 of another pulley 7. The cord 8 which is connected to the ladder is entrained round the pulley 7 and anchored to a fixed point 9. This arrangement provides a direct 2 to 1 reduction gear ; other ratios may be obtained by increasing the number of pulleys. In a modification the chain 4 and cord 8 are attached to and entrained around different sized pulleys attached to a common shaft. The spring and reduction gear may alternatively be carried by the ladder the appropriate chain or cord being attached to some stationary point. Specification 453,968 also is referred to.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1827235A GB453969A (en) | 1935-06-26 | 1935-06-26 | Improvements relating to spring balanced loft ladders |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1827235A GB453969A (en) | 1935-06-26 | 1935-06-26 | Improvements relating to spring balanced loft ladders |
Publications (1)
Publication Number | Publication Date |
---|---|
GB453969A true GB453969A (en) | 1936-09-22 |
Family
ID=10109597
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1827235A Expired GB453969A (en) | 1935-06-26 | 1935-06-26 | Improvements relating to spring balanced loft ladders |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB453969A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1041674B (en) * | 1954-07-10 | 1958-10-23 | Aloys Hesselkamp Fa | Retractable attic stairs |
-
1935
- 1935-06-26 GB GB1827235A patent/GB453969A/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1041674B (en) * | 1954-07-10 | 1958-10-23 | Aloys Hesselkamp Fa | Retractable attic stairs |
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