GB611693A - Improvements in trap doors - Google Patents

Improvements in trap doors

Info

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
Application number
GB1371146A
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.)
EDGAR HILDER WRIGHT
Original Assignee
EDGAR HILDER WRIGHT
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 EDGAR HILDER WRIGHT filed Critical EDGAR HILDER WRIGHT
Priority to GB1371146A priority Critical patent/GB611693A/en
Publication of GB611693A publication Critical patent/GB611693A/en
Expired legal-status Critical Current

Links

Classifications

    • EFIXED CONSTRUCTIONS
    • E06DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
    • E06BFIXED OR MOVABLE CLOSURES FOR OPENINGS IN BUILDINGS, VEHICLES, FENCES OR LIKE ENCLOSURES IN GENERAL, e.g. DOORS, WINDOWS, BLINDS, GATES
    • E06B5/00Doors, windows, or like closures for special purposes; Border constructions therefor
    • E06B5/01Trap-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.
GB1371146A 1946-05-06 1946-05-06 Improvements in trap doors Expired GB611693A (en)

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)

* Cited by examiner, † Cited by third party
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

Cited By (3)

* Cited by examiner, † Cited by third party
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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