Abrégé

A latch assembly for a door having a door body mounted on a door frame includes a retainer movable between a latching position and a non-latching position and configured, in the latching position, to retain the door body in a closed position, and to permit the door body to move with respect to the door frame in the non-latching position to an open position. An actuator is selectively moveable to change the retainer from the latching position to a non-latching position. A linkage is configured to move the retainer in a latching direction toward the latching position and in an unlatching direction toward the non-latching position responsive to actuation of the actuator. A crank is operatively connected to the actuator and linkage and configured to move the retainer toward the latching position as the retainer approaches the latching position.

Classes IPC  ?

• E05C 3/00 - Dispositifs d'immobilisation avec pênes se déplaçant de façon pivotante ou rotative
• E05C 3/16 - Dispositifs d'immobilisation avec pênes se déplaçant de façon pivotante ou rotative avec action d'une clenche avec poignée de manœuvre ou organe équivalent se déplaçant autrement que rigidement avec la clenche
• E05C 9/10 - Mécanismes actionnant les barres
• E05C 9/18 - Parties constitutives des moyens d'immobilisation de fermeture ou des moyens fixes de retenue pour les extrémités de barres
• E21F 1/10 - Portes d'aérage

Abrégé

A latch assembly for a door having a door body mounted on a door frame includes a retainer movable between a latching position and a non-latching position and configured, in the latching position, to retain the door body in a closed position, and to permit the door body to move with respect to the door frame in the non-latching position to an open position. An actuator is selectively moveable to change the retainer from the latching position to a non-latching position. A linkage is configured to move the retainer in a latching direction toward the latching position and in an unlatching direction toward the non-latching position responsive to actuation of the actuator. A crank is operatively connected to the actuator and linkage and configured to move the retainer toward the latching position as the retainer approaches the latching position.

Classes IPC  ?

• E05C 3/00 - Dispositifs d'immobilisation avec pênes se déplaçant de façon pivotante ou rotative
• E05C 3/16 - Dispositifs d'immobilisation avec pênes se déplaçant de façon pivotante ou rotative avec action d'une clenche avec poignée de manœuvre ou organe équivalent se déplaçant autrement que rigidement avec la clenche
• E05C 9/18 - Parties constitutives des moyens d'immobilisation de fermeture ou des moyens fixes de retenue pour les extrémités de barres
• E21F 1/10 - Portes d'aérage

Abrégé

A jack for installing a mine stopping panel includes an extendible post and a press for extending the extendible post. The press can have a lever movable between an actuated position and a non-actuated position and operative to extend the post as it moves toward the actuated position and retract the post as it moves toward the non-actuated position. A yieldable biaser yields when the post is extended to extend the mine stopping panel and the mine stopping panel engages a mine surface with sufficient force to crush a stopping seal and anchor the stopping panel. The press can comprise an over-center toggle linkage.

Classes IPC  ?

• B66F 3/00 - Dispositifs, p. ex. crics, adaptés pour lever des charges d'un mouvement continu
• E21F 17/103 - Barrages, p. ex. pour ventilation

Abrégé

A mine stopping and associated components and methods. The stopping can include one or more columns or other vertical supports and a plurality of elongate panels extending horizontally.

Classes IPC  ?

• E21F 1/14 - Cloisons d'aérageSas à air
• E21F 17/103 - Barrages, p. ex. pour ventilation

Abrégé

A mine stopping panel for installation between opposing first and second mine surfaces of a mine passage includes a panel member. The panel member has a channel shape and a web, side flanges at opposite sides of the web, an upper end, and a lower end. An end cap is attached to the panel member adjacent one of the upper and lower ends of the panel member in a position between the side flanges of the panel member adjacent an inside surface of the web of the panel member. The end cap defines a cavity for receiving an injectable foam material and an injection inlet for injecting said foam material into the first cavity. In a method of the invention and injectable foam material is injected into the cavity through the injection inlet during a process of sealing the mine passage.

Classes IPC  ?

• E21F 1/14 - Cloisons d'aérageSas à air
• E21F 17/103 - Barrages, p. ex. pour ventilation

Abrégé

A mine door system which includes a mine door having a door leaf, and a door-moving mechanism that articulates between a first configuration in which the mechanism applies a relatively smaller door-moving force to the door leaf and moves it at a first speed and a second configuration in which the mechanism applies a larger door-moving force to the door leaf and moves it at a second speed less than the first speed.

Classes IPC  ?

• E05F 15/616 - Mécanismes pour battants mus par une force motrice utilisant des actionneurs électriques utilisant des électromoteurs rotatifs pour battants pivotants manœuvrés par mécanismes "pousser-tirer"
• E21F 1/12 - Dispositifs d'ouverture automatique des portes d'aérage
• E05F 15/63 - Mécanismes pour battants mus par une force motrice utilisant des actionneurs électriques utilisant des électromoteurs rotatifs pour battants pivotants manœuvrés par bras pivotants
• E21F 1/10 - Portes d'aérage
• E06B 3/36 - Aménagements des battants caractérisés par le genre de mouvementAménagements des battants modèles dans les ouverturesCaractéristiques des battants ou châssis ayant trait uniquement au genre de mouvement du battant pour un seul genre de mouvement avec un axe de rotation vertical unique sur l'un des côtés de l'ouverture, ou tournant dans l'ouverture

Abrégé

A mine door system which includes a mine door having a door leaf, and a door-moving mechanism that articulates between a first configuration in which the mechanism applies a relatively smaller door-moving force to the door leaf and moves it at a first speed and a second configuration in which the mechanism applies a larger door-moving force to the door leaf and moves it at a second speed less than the first speed.

Classes IPC  ?

• E05F 15/53 - Mécanismes pour battants mus par une force motrice utilisant des actionneurs à pression de fluide pour battants pivotants
• E05F 15/611 - Mécanismes pour battants mus par une force motrice utilisant des actionneurs électriques utilisant des électromoteurs rotatifs pour battants pivotants
• E06B 5/10 - Portes, fenêtres ou fermetures analogues à buts particuliersStructures de cadrage à leur effet pour protection contre les raids aériens ou autres actes de guerrePortes, fenêtres ou fermetures analogues à buts particuliersStructures de cadrage à leur effet pour d'autres buts de protection
• E21F 1/10 - Portes d'aérage
• E21F 1/14 - Cloisons d'aérageSas à air

Abrégé

A reinforced lightweight mine door for installation in a mine passageway. The mine door includes a generally rectangular sheet metal door panel having four sides and four corners, and a reinforcing structure projecting from a face of the door panel. The reinforcing structure has a central section and a plurality of channel sections extending from the central section toward respective sides or corners of the door panel. A mine door including at least one hinge arrangement having unique reversibility features is also disclosed.

Classes IPC  ?

• E06B 5/10 - Portes, fenêtres ou fermetures analogues à buts particuliersStructures de cadrage à leur effet pour protection contre les raids aériens ou autres actes de guerrePortes, fenêtres ou fermetures analogues à buts particuliersStructures de cadrage à leur effet pour d'autres buts de protection
• E06B 5/14 - Portes ou autres fermetures à l'épreuve des gazAdaptation des constructions fixes à cet effet
• E21F 1/10 - Portes d'aérage

Abrégé

A reinforced lightweight mine door for installation in a mine passageway. The mine door includes a generally rectangular sheet metal door panel having four sides and four corners, and a reinforcing structure projecting from a face of the door panel. The reinforcing structure has a central section and a plurality of channel sections extending from the central section toward respective sides or corners of the door panel. A mine door including at least one hinge arrangement having unique reversibility features is also disclosed.

Classes IPC  ?

• E06B 3/00 - Châssis mobiles de fenêtres, battants de portes ou éléments analogues pour fermer les ouverturesPose des fermetures fixes ou mobiles, p. ex. des fenêtresCaractéristiques des châssis extérieurs fixes relatives au montage des châssis des battants
• E21F 1/10 - Portes d'aérage
• E06B 5/10 - Portes, fenêtres ou fermetures analogues à buts particuliersStructures de cadrage à leur effet pour protection contre les raids aériens ou autres actes de guerrePortes, fenêtres ou fermetures analogues à buts particuliersStructures de cadrage à leur effet pour d'autres buts de protection
• E06B 3/12 - Structures dépendant de l'emploi de matériaux spécifiés en métal

Abrégé

A mine stopping panel is disclosed. The panel includes first and second channel-shaped panel members having a telescoping sliding fit one inside the other. An elongate end cap is fitted in the first panel member. One or more louver connections between the first panel member and the end cap hold the end cap against movement relative to the first panel member when an extending force is applied to the end cap tending to telescopically extend the first panel member relative to the second panel member.

Classes IPC  ?

• E21F 1/14 - Cloisons d'aérageSas à air
• E21F 1/10 - Portes d'aérage

Abrégé

A mine ventilation structure is disclosed. The structure comprises a deck including a plurality of elongate sheet metal panels. Each panel is generally of inverted channel shape in transverse cross-section, having a top web and first and second sides extending down from the top web. The panels are connected by tongue-and-groove connections between adjacent sides of adjacent panels. A mine ventilation deck panel of desired construction is also disclosed.

Classes IPC  ?

• E04F 11/16 - Surfaces de marchesMoyens de protection des bords ou des angles de marches
• E21F 1/14 - Cloisons d'aérageSas à air
• E21F 1/16 - Couvercles de puits
• E21F 1/04 - Conduites d'air

Abrégé

A mine ventilation structure is disclosed. The structure comprises a deck including a plurality of elongate sheet metal panels. Each panel is generally of inverted channel shape in transverse cross-section, having a top web and first and second sides extending down from the top web. The panels are connected by tongue-and-groove connections between adjacent sides of adjacent panels. A mine ventilation deck panel of desired construction is also disclosed.

Classes IPC  ?

• E21D 11/14 - Revêtement principalement avec du métal
• E21F 1/00 - Ventilation des mines ou tunnelsDistribution des courants de ventilation
• E21F 1/16 - Couvercles de puits

Abrégé

A mine stopping panel and method of making it are disclosed. In one embodiment, the panel includes first and second channel-shaped panel members having a telescoping sliding fit one inside the other. An elongate end cap fitted in the first panel member. One or more connections between the first panel member and the end cap hold the end cap against movement relative to the first panel member when an extending force is applied to the end cap tending to telescopically extend the first panel member relative to the second panel member. At least one device on the end cap is configured for engagement with the first panel member to resist telescopic movement of the first end cap relative to the first panel member when a contracting force is applied to the first end cap. Other improved mechanisms for resisting contracting forces are disclosed.

Classes IPC  ?

• E21F 1/08 - Dispositifs de ventilation relatifs aux conduits d'air, p. ex. agencements de montage des ventilateurs
• E21F 1/14 - Cloisons d'aérageSas à air

Abrégé

A mine stopping panel and method of making it are disclosed. In one embodiment, the panel includes first and second channel-shaped panel members having a telescoping sliding fit one inside the other. An elongate end cap fitted in the first panel member. One or more connections between the first panel member and the end cap hold the end cap against movement relative to the first panel member when an extending force is applied to the end cap tending to telescopically extend the first panel member relative to the second panel member. At least one device on the end cap is configured for engagement with the first panel member to resist telescopic movement of the first end cap relative to the first panel member when a contracting force is applied to the first end cap. Other improved mechanisms for resisting contracting forces are disclosed.

Classes IPC  ?

• E21F 17/103 - Barrages, p. ex. pour ventilation

Abrégé

A conveyor belt box check for installation in a mine is disclosed. The box check includes first and second generally parallel spaced-apart walls extending across a mine passage. Each of the walls has a conveyor belt aperture sized for receiving the conveyor. In some embodiments, access doors are provided in the first and second walls, and a partition extends between the first and second walls for separating the access doors from the conveyor belt apertures and for forming an air lock between the walls. A method of installing the box check is also disclosed.

Classes IPC  ?

• B65G 21/08 - Toits de protection ou arceaux de support du toit
• E21F 17/00 - Procédés ou dispositifs destinés à être utilisés dans les mines ou tunnels, non couverts ailleurs

Abrégé

A conveyor belt box check for installation in a mine is disclosed. The box check includes first and second generally parallel spaced-apart walls extending across a mine passage. Each of the walls has a conveyor belt aperture sized for receiving the conveyor. In some embodiments, access doors are provided in the first and second walls, and a partition extends between the first and second walls for separating the access doors from the conveyor belt apertures and for forming an air lock between the walls. A method of installing the box check is also disclosed.

Classes IPC  ?

• E21F 1/00 - Ventilation des mines ou tunnelsDistribution des courants de ventilation
• E21F 13/08 - Convoyeurs mobiles ou autres dispositifs de transport d'un point du front de taille à un autre

Abrégé

A mine stopping panel is disclosed. The panel includes first and second channel-shaped panel members having a telescoping sliding fit one inside the other. An end cap is fitted in the first panel member. One or more louver connections between the first panel member and the end cap hold the end cap against movement relative to the first panel member when an extending force is applied to the end cap tending to telescopically extend the first panel member relative to the second panel member.

Classes IPC  ?

• E21F 1/14 - Cloisons d'aérageSas à air

Abrégé

A mine stopping panel is disclosed. The panel includes first and second channel-shaped panel members having a telescoping sliding fit one inside the other. An elongate end cap is fitted in the first panel member. One or more louver connections between the first panel member and the end cap hold the end cap against movement relative to the first panel member when an extending force is applied to the end cap tending to telescopically extend the first panel member relative to the second panel member.

Classes IPC  ?

• E21F 17/103 - Barrages, p. ex. pour ventilation

Abrégé

Controlling energy usage of a building. At least one temperature sensor monitors temperature within a zone of a building. A processor determines an off-peak temperature target as a function of a duration of an off-peak operating state of the monitored zone and a desired temperature within the monitored zone during a subsequent peak operating state of the monitored zone. A controller receives the determined off-peak temperature target and is responsive to the received off-peak temperature target to control the temperature within the monitored zone of the building during the off-peak operating state. Other aspects of the invention are directed to computer-readable media for controlling energy usage of a building as described.

Classes IPC  ?

• F24D 19/10 - Aménagements ou montage des dispositifs de commande ou de sécurité

Abrégé

A high-strength anchor system for anchoring a support to mine strata is disclosed. The system includes an anchor plate and a connecting member on the anchor plate for connection of the support to the anchor plate. Anchor bolts extend through bolt holes in the anchor plate into bore holes in the mine strata. Load-spreading devices extend from respective bolt holes in the anchor plate into the bore holes. The load-spreading devices have outside diameters larger than outside diameters of the anchor bolts for spreading shear loads exerted on the anchor bolts over larger areas of the mine strata. A method of installing such a system and a safe room bulkhead using such a system are also disclosed.

Classes IPC  ?

• E21D 11/15 - Plaques de revêtementGarnissages, c.-à-d. revêtements conçus pour retenir les matériaux de la formation ou pour transmettre la charge aux éléments de support principaux
• E21D 21/00 - Boulons d'ancrage pour la protection du toit, de la sole ou du revêtement des puits
• E21F 11/00 - Dispositifs de sauvetage ou autres dispositifs de sécurité, p. ex. refuges ou itinéraires d'échappement

Abrégé

A high-strength anchor system for anchoring a support to mine strata is disclosed. The system includes an anchor plate and a connecting member on the anchor plate for connection of the support to the anchor plate. Anchor bolts extend through bolt holes in the anchor plate into bore holes in the mine strata. Load-spreading devices extend from respective bolt holes in the anchor plate into the bore holes. The load-spreading devices have outside diameters larger than outside diameters of the anchor bolts for spreading shear loads exerted on the anchor bolts over larger areas of the mine strata. A method of installing such a system and a safe room bulkhead using such a system are also disclosed.

Classes IPC  ?

• E02D 29/00 - Ouvrages souterrains ou sous l'eauMurs de soutènement
• E21D 21/00 - Boulons d'ancrage pour la protection du toit, de la sole ou du revêtement des puits

Abrégé

A mine door system comprising at least one mine door leaf hinged at one side thereof to a door frame defining an entry. The system includes an articulated door-moving mechanism that articulates between a first configuration in which the mechanism applies a relatively small door-moving force to the door leaf to move the door leaf at a first speed and a second configuration in which the mechanism applies a larger door-moving force to the door leaf to move the door leaf at a second speed less than the first speed. A related method is also disclosed.

Classes IPC  ?

• E05F 15/12 - pour battants pivotants

Abrégé

A mine door system comprising at least one mine door leaf hinged at one side to a door frame defining an entry. The system includes an articulated door-moving mechanism that articulates between a first configuration in which the mechanism applies a relatively small door-moving force to the door leaf to move it at a first speed and a second configuration in which the mechanism applies a larger door--moving force to the door leaf to move it at a second speed less than the first speed. A related method is also disclosed.

Classes IPC  ?

• E05F 15/00 - Mécanismes pour battants mus par une force motrice
• E05F 15/611 - Mécanismes pour battants mus par une force motrice utilisant des actionneurs électriques utilisant des électromoteurs rotatifs pour battants pivotants
• E21F 17/00 - Procédés ou dispositifs destinés à être utilisés dans les mines ou tunnels, non couverts ailleurs

Abrégé

A method of opening a mine door leaf installed in a mine passageway having a high pressure zone and a low pressure zone. The method includes the steps of operating a variable-throw crank mechanism in a first configuration having a first crank length to apply a first force to the mine door leaf to move at a first speed, operating the variable-throw crank mechanism in a second configuration having a second crank length less than the first crank length to apply a second force greater than the first force to the mine door leaf to move at a second speed slower than the first speed, and using a resistance pressure associated with the high and low pressure zones in the mine passageway to convert the variable-throw crank mechanism from the first configuration to the second configuration.

Classes IPC  ?

• E05F 15/00 - Mécanismes pour battants mus par une force motrice
• E05F 15/611 - Mécanismes pour battants mus par une force motrice utilisant des actionneurs électriques utilisant des électromoteurs rotatifs pour battants pivotants
• E21F 17/00 - Procédés ou dispositifs destinés à être utilisés dans les mines ou tunnels, non couverts ailleurs

Abrégé

A mine ventilation and bridge structure incorporating a bridge feature enabling a mine vehicle to cross over the structure. The structure comprises a pair of generally parallel and spaced-apart side walls defining opposing side walls and a plurality of elongate deck panels extending between the side walls. At least one deck panel of the plurality of deck panels is a reinforced bridge deck panel constructed to support the weight of a vehicle crossing over the mine ventilation and bridge structure.

Classes IPC  ?

• E01D 6/00 - Ponts du type en treillis
• E01D 1/00 - Ponts en général
• B63C 11/10 - Vêtements rigides
• E21F 3/00 - Refroidissement ou séchage de l'air

Abrégé

A hydraulic system has a hydraulic actuator for moving a door leaf of a door installation between open and closed positions thereof. A reservoir has a volume for containing a hydraulic fluid. A fluid circuit provides fluid communication between the hydraulic actuator and the reservoir. The system also has a pump for pumping hydraulic fluid from the reservoir into the fluid circuit to operate the actuator. A fluid circuit flushing system of the hydraulic system operates to flush a volume of hydraulic fluid from the fluid circuit back to the reservoir without moving any door leaves of the door installation. The hydraulic system may be part of a mine door installation installed in a mine passageway and having at least one door leaf. The hydraulic actuator is connected to the door leaf for driving movement of the door leaf between its open and closed positions.

Classes IPC  ?

• E05F 15/00 - Mécanismes pour battants mus par une force motrice
• E21D 9/06 - Exécution en utilisant un bouclier de percement

Abrégé

A mine refuge for use in a mine includes a chamber having an interior space sized and shaped for occupancy by at least one person. An oxygen supply is installed in the chamber for supplying oxygen to the chamber. A mask is operatively connected to the oxygen supply and is adapted for donning by the person to supply oxygen to the person. In some embodiments, an air supply in addition to the oxygen supply is provided.

Classes IPC  ?

• E21F 11/00 - Dispositifs de sauvetage ou autres dispositifs de sécurité, p. ex. refuges ou itinéraires d'échappement

Abrégé

A mine refuge for use in a mine includes a chamber sized and shaped for occupancy by at least one miner. An oxygen supply is adapted to be installed in the chamber for supplying oxygen to the chamber. A carbon dioxide reduction system is adapted to be installed in the chamber for reducing carbon dioxide in the chamber. The carbon dioxide reduction system is operable in the mine without an electrical power source.

Classes IPC  ?

• E21F 11/00 - Dispositifs de sauvetage ou autres dispositifs de sécurité, p. ex. refuges ou itinéraires d'échappement

Abrégé

A mine refuge for use in a mine includes a chamber sized and shaped for occupancy by at least one miner and adapted to be substantially sealed. An oxygen supply is installed in the chamber for supplying oxygen to the chamber. A breathable air supply is installed in the chamber for supplying a steady flow of breathable air and for positively pressurizing the chamber to inhibit entry of contaminated mine air into the chamber.

Classes IPC  ?

• E21F 11/00 - Dispositifs de sauvetage ou autres dispositifs de sécurité, p. ex. refuges ou itinéraires d'échappement

Abrégé

A mine door system for closing a mine doorway comprises a door hinged adjacent the doorway for swinging relative to the stopping between a closed position and an open position swung outwardly away from the stopping. A keeper is mounted in fixed position relative to the doorway. The system further comprises a trigger-actuated latch mechanism including a detent engageable with the keeper for latching the door in its closed position and a trigger operably connected to the detent in a latched position. The mechanism is constructed and configured so that actuation of the trigger causes the detent to move from a latched position in which the detent engages the keeper for latching the door closed to an unlatched position in which the detent is disengaged from the keeper for allowing the door to be opened.

Classes IPC  ?

• E05B 63/20 - Serrures à caractéristiques structurales particulières avec dispositions indépendantes du mécanisme de verrouillage pour maintenir le pêne en position de retrait mises hors fonction automatiquement quand le battant est fermé
• E05C 3/06 - Dispositifs d'immobilisation avec pênes se déplaçant de façon pivotante ou rotative sans action d'une clenche avec poignée de manœuvre ou organe équivalent se déplaçant autrement que rigidement avec le pêne
• E05C 3/14 - Dispositifs d'immobilisation avec pênes se déplaçant de façon pivotante ou rotative avec action d'une clenche avec poignée de manœuvre ou organe équivalent fixé rigidement à la clenche
• E05C 3/16 - Dispositifs d'immobilisation avec pênes se déplaçant de façon pivotante ou rotative avec action d'une clenche avec poignée de manœuvre ou organe équivalent se déplaçant autrement que rigidement avec la clenche
• E06B 5/14 - Portes ou autres fermetures à l'épreuve des gazAdaptation des constructions fixes à cet effet
• E21F 1/10 - Portes d'aérage
• E21F 17/12 - Portes de barrage

Abrégé

A mine door system for closing a mine doorway comprises a door hinged adjacent the doorway for swinging relative to the stopping between a closed position and an open position swung outwardly away from the stopping. A keeper is mounted in fixed position relative to the doorway. The system further comprises a trigger-actuated latch mechanism including a detent engageable with the keeper for latching the door in its closed position and a trigger operably connected to the detent in a latched position. The mechanism is constructed and configured so that actuation of the trigger causes the detent to move from a latched position in which the detent engages the keeper for latching the door closed to an unlatched position in which the detent is disengaged from the keeper for allowing the door to be opened.

Classes IPC  ?

• E05B 63/20 - Serrures à caractéristiques structurales particulières avec dispositions indépendantes du mécanisme de verrouillage pour maintenir le pêne en position de retrait mises hors fonction automatiquement quand le battant est fermé

Abrégé

A panel system for making mine ventilation structures. The panel system comprises a plurality of elongate metal panels having flanges along sides thereof configured for overlapping one another when the panels are placed in side-by-side relation. When the panels are secured together they form a unitary load-bearing structure. Related methods and equipment for installing the panels are also disclosed.

Classes IPC  ?

• E21D 9/14 - Tracé des tunnels ou des galeriesParticularités de construction des tunnels ou des galeries, non prévues ailleurs, p. ex. têtes, atténuation de la lumière du jour aux entrées de tunnels
• E21F 1/14 - Cloisons d'aérageSas à air
• E21F 17/103 - Barrages, p. ex. pour ventilation

Abrégé

A panel system for making mine ventilation structures. The panel system comprises a plurality of elongate metal panels having flanges along sides thereof configured for overlapping one another when the panels are placed in side-by- side relation. When the panels are secured together they form a unitary load-bearing structure. Related methods and equipment for installing the panels are also disclosed.

Classes IPC  ?

• E04B 1/343 - Structures caractérisées par des parties mobiles, séparables ou repliables, p. ex. pour le transport
• E21D 9/14 - Tracé des tunnels ou des galeriesParticularités de construction des tunnels ou des galeries, non prévues ailleurs, p. ex. têtes, atténuation de la lumière du jour aux entrées de tunnels
• E21F 1/14 - Cloisons d'aérageSas à air
• E21F 17/103 - Barrages, p. ex. pour ventilation

Abrégé

A mine door of the present invention is adaptedfor installation in a mine passageway and includes a doorunit adapted for swinging between a closed position and anopen position. The door unit may be mounted in a frame, anda stopping wall may surround the frame. When closed, thedoor unit is subject to a differential in air pressureinvolving higher pressure on one of the faces of the doorunit than on the other of the faces of the door unit. Thedoor unit has a man doorway closed by a man door. The doorunit, the frame, or the stopping has a pressure reliefopening therein for passage of air therethrough fromadjacent the one of the faces of the door unit to adjacentthe other of the faces to more nearly equalize the pressureon the faces and thereby facilitate opening the door unit.The pressure relief opening is smaller than the man doorway.

Classes IPC  ?

• E21F 1/10 - Portes d'aérage
• E21F 1/12 - Dispositifs d'ouverture automatique des portes d'aérage