Door structure

Details Door structure Door structure

1999-02-09

2001-02-13

Stodola, Daniel P. (Department: 3634)

Movable or removable closures

Panel with closure feature

C293S147000

Reexamination Certificate

active

06185871

ABSTRACT:

BACKGROUND OF THE INVENTION
(a) Field of the Invention
The present invention relates to an improved door structure, especially to the improvements made on a structure of fireproof doors, entrance doors, emergency doors, and acoustical isolation doors. The improved door structure has better performances in protection against fires, smoke and acoustical penetration. It can give better security to prevent invasion.
(b) Description of the Prior Art
Conventional door structures adopt right corners on the periphery of door leaves and door frames. Such door structures are easier to be opened by inserting a tool into the gaps between a door leaf and its door frame to pry the door open. In addition, when external forces hit such a door structure, the door leaf and the door frame deform easier. Furthermore, if chain locks and do or hinges loosen due to destruction by external forces or rustiness, the door leaf of a conventional door structure will easily separate from the door frame and fall flat, which might produce casualties. Such possibilities must be eliminated, especially for children. Moreover a metal door will expand when heated. Thus when the house is on fire, the door leaf and the door frame will deform. The right corner design of conventional door structures makes the door leaf and the door frame stuck to each other easier. This may lead to the blockade of emergency exits. Besides, conventional door structures often allow gaps between the boundaries of a door leaf and a door frame to make opening easier and smooth. The gaps are detrimental to the effect of preventing smoke penetration. Conventional door structures are provided with lock means to join a door leaf with a door frame when door is closed to prevent thief's or stranger's invasion. The lock means should be preferably provided with features of preventing destruction by external forces. Conventional door structures usually have one single lock or latch. Such lock means are easier to be broken. As a result they can not provide better protection against the invasion.
SUMMARY OF THE INVENTION
The primary object of the invention is to provide a door structure in which one pair of the mated side surfaces of the door leaf and the door frame adopts a slant surface arrangement. When the door is closed, the other side surface of the door leaf abuts closely against a retaining plate of the door frame. Thus the door leaf and the door frame can press against each other. Furthermore, when someone tries to pry the door leaf, the slant mated surfaces of the door leaf and the frame will prevent the door from being opened. As a result, the door structure according to the invention has better security.
Another object of the invention is to provide a door structure that will not deform easily as it suffers impacts from external forces and contrarily will form closer joining between the door leaf and the door frame. Therefore the door structure according to the invention will not be broken easily.
Another object of the invention is to provide a door structure in which the gaps between the door leaf and the door frame can be minimized because the adjacent surfaces between them are slant. Thus the door structure according to the invention has excellent performances in protection against fire, and smoke and acoustical penetration.
Another object of the invention is to provide a door structure of which the retaining means have multiple locking effects. The door leaf of the inventive structure can be automatically locked at several places by the retaining mechanisms of the door frame. Thus the locking can not be easily destroyed by outside violence and the door provides better protection against outside invasion.


REFERENCES:
patent: 313742 (1885-03-01), Kintner
patent: 319121 (1885-06-01), Power
patent: 507922 (1893-10-01), Ohaver
patent: 524427 (1894-08-01), Vanvactor
patent: 534806 (1895-02-01), Stover
patent: 551250 (1895-12-01), Ballheim
patent: 564206 (1896-07-01), Loveland
patent: 1794887 (1931-03-01), Emler
patent: 1891073 (1932-12-01), Warner
patent: 3126051 (1964-03-01), Sussin
patent: 3977711 (1976-08-01), Lajcak
patent: 4348836 (1982-09-01), Dumenil et al.

Affiliated with

Also associated with

Rating

Door structure does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Door structure, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Door structure will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2582910