GB611693A - Improvements in trap doors - Google Patents
Improvements in trap doorsInfo
- Publication number
- GB611693A GB611693A GB1371146A GB1371146A GB611693A GB 611693 A GB611693 A GB 611693A GB 1371146 A GB1371146 A GB 1371146A GB 1371146 A GB1371146 A GB 1371146A GB 611693 A GB611693 A GB 611693A
- Authority
- GB
- United Kingdom
- Prior art keywords
- cover
- frame
- counterbalanced
- pivoted
- angle iron
- 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
- E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
- E06B—FIXED OR MOVABLE CLOSURES FOR OPENINGS IN BUILDINGS, VEHICLES, FENCES OR LIKE ENCLOSURES IN GENERAL, e.g. DOORS, WINDOWS, BLINDS, GATES
- E06B5/00—Doors, windows, or like closures for special purposes; Border constructions therefor
- E06B5/01—Trap-doors
Landscapes
- Engineering & Computer Science (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Specific Sealing Or Ventilating Devices For Doors And Windows (AREA)
Abstract
611,693. Hatch covers. WRIGHT, E. H. May 6, 1946, No. 13711. [Class 113 (i)] [Also in Group X] In a counterbalanced hatch cover, a lever arm carrying a counterbalance is secured to the cover which is pivoted in its frame. In the form shown the cover comprises a rectangular angle iron frame supporting a wood filling which is strengthened by transverse steel plates and which may be provided with a ventilation grating 13. The cover is pivoted to the frame by hinge pins 15 about which it is counterbalanced by weights 17 adjusted on two angled lever arms 16 attached to the underside of the cover at the hinge position so that when the cover is swung up it will remain balanced in position. The frame is of tee and angle iron members which form a rebate for the cover. The front member may carry a roller which facilitates the use of hauling ropes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1371146A GB611693A (en) | 1946-05-06 | 1946-05-06 | Improvements in trap doors |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1371146A GB611693A (en) | 1946-05-06 | 1946-05-06 | Improvements in trap doors |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB611693A true GB611693A (en) | 1948-11-02 |
Family
ID=10027988
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1371146A Expired GB611693A (en) | 1946-05-06 | 1946-05-06 | Improvements in trap doors |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB611693A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR3014463A1 (en) * | 2015-01-30 | 2015-06-12 | Campenon Bernard Regions | DEVICE FOR AUTOMATICALLY OPENING / CLOSING A TRAPPER |
| US11339598B2 (en) | 2018-08-30 | 2022-05-24 | Caldwell Manufacturing Company North America, LLC | Window vent assist mechanism for vent window assembly |
-
1946
- 1946-05-06 GB GB1371146A patent/GB611693A/en not_active Expired
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR3014463A1 (en) * | 2015-01-30 | 2015-06-12 | Campenon Bernard Regions | DEVICE FOR AUTOMATICALLY OPENING / CLOSING A TRAPPER |
| EP3051049A1 (en) * | 2015-01-30 | 2016-08-03 | Campenon Bernard Regions | Device for automatic opening/closing of a door |
| US11339598B2 (en) | 2018-08-30 | 2022-05-24 | Caldwell Manufacturing Company North America, LLC | Window vent assist mechanism for vent window assembly |
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