Movable or removable closures – Removable closure – With separable closure sections
Patent
1982-11-15
1985-05-21
Downey, Kenneth
Movable or removable closures
Removable closure
With separable closure sections
49505, E06B 332
Patent
active
045177678
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to a frame for a doorway for use in closing an underground mine passage and to a ventilation door assembly for use with the frame.
BACKGROUND ART
In, for example, coal mines it is usual for the mining operation to form a network of spaced apart passages such as shown schematically in FIG. 1.
Typically a first passageway 1 is utilized to provide ventilation to the active mining face and a second passageway 2 is utilized to provide a ventilation return path from the face.
Cross passages 3 communicating between the first and second passageway are closed in order to improve the ventilation flows, but the closure 4 must include a door or trapdoor 5 openable to permit a man to pass therethrough in the event of an emergency.
Mine passages are not of uniform dimension, nor of uniform cross-section, and in fact are liable to change in cross-section as time passes due to floor heave or roof pressure. Therefore each doorway frame is presently individually constructed at the desired location from timber. Each of two timber pillars is first cut to approximate size, next wedged upright in place between the roof and the floor, and then doorway frame members are constructed and mounted to the pillars and a suitable door supported therefrom. The space between the doorway frame and the surrounding passage wall is then bricked up, or otherwise sealed. Typically each such construction involves 2 men for a day.
In addition it is sometimes desired to provide partial closure of a passageway to balance the ventilation system.
In that event it has been usual to partially close the passage with brick walls leaving an opening which in turn is partially closed by a cladding material for example by fibro cement or timber loosely nailed to battons. The sheets are arranged to leave an unclad opening having an area determined by aerodynamic measurement to provide balanced ventilation.
Each shift, inspectors are required to pass through the passage. To do so they must remove the cladding sheets and do not always return them to the correct position. The ventilation openings are the subject of regulations and if adjustable must be locked by mine management.
DISCLOSURE OF THE INVENTION
The present invention provides a doorway frame suitable for installation in a mine passageway and which in preferred embodiments may be prefabricated and may be installed in a very much shorter time than previous doorway frames.
According to a first aspect the invention consists in a doorway frame for installation in a mine passage and comprising: clamped, and to each.
In preferred embodiments of the invention the doorway frame further comprises a substantially horizontal member connecting the lower end of one upright with that of the other.
Doorway frames according to the invention may be prefabricated and may be preassembled with or without a doorway hinged thereto or may be taken into the mine in kit form and assembled where required.
In a preferred embodiment, the doorway frame of the invention is provided with a door frame hinged thereto; each side of the door frame is provided with an upwardly extending "U" cross section channel of which the longitudinal opening of each faces the other, and the channels are adapted to receive modular slats or panels extending therebetween so that the slats or panels are stacked edge to edge and may be inserted or removed from the upper end of the channels to vary the area of the door frame which is clad thereby to adjust the unclad area which provides a ventilation passage.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will now be more particularly described by way of example only with reference to the accompanying drawings wherein:
FIG. 1 is a schematic representation of a mine passageway.
FIG. 2 shows in front elevation a first embodiment of a doorway frame according to the invention.
FIGS. 3, 4, 5 show in detail portions of the embodiment of FIG. 2.
FIG. 6 shows in plan view the embodiment of FIG. 2.
FIG. 7 shows in side elevation the embodiment of FIG. 2.
FIG. 8 show
REFERENCES:
patent: 1279879 (1918-09-01), Klingberg
patent: 1387059 (1921-08-01), McAllister
patent: 1442553 (1923-01-01), Wood
patent: 1741940 (1929-12-01), Jacobson
patent: 2316688 (1943-04-01), Haase
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