Abstract: A personnel access door assembly of an opposing wing of a mine ventilation door. The personnel access door includes a frame including a top portion, a bottom portion, a first post portion and a second post portion, the top frame portion and the bottom frame portion coupled to respective top and bottom ends of the first post and second post portions. The personnel access door further includes sets of trolley wheels affixed to the top or bottom of the frame to engage a top rail or bottom rail affixed on the opposing wing.

Abstract: An apparatus for reinforcing a deadbolt lock comprising a pin, a door brace with an orifice for a deadbolt, a base plate with an orifice for engaging said pin with a base plate further being attached to the door brace, a turn knob attached and in rotational communication with a base plate. The turn knob further comprising an orifice for said pin and a deadbolt which can extend through the door brace. When the turn knob is rotated the pin can engage the door brace or base plate and prevent movement of the deadbolt through the door brace.

Abstract: A door apparatus includes a door, actuating mechanism, and tie rod mechanism, the actuating mechanism actuating the tie rod mechanism to impart a substantially translating motion to the door. The actuating mechanism can include a drive yoke coupled to the tie rod mechanism with a one-way coupling. The tie rod mechanism can include a primary tie rod coupled to a secondary tie rod coupled to a latch. In another aspect a door apparatus includes an actuator, a first door, a second door, a first linkage assembly coupling the actuator to the first door, and a second linkage assembly coupling the first door to the second door, the actuator configured to activate the first linkage assembly to move the first door, the first door imparting motion to the second linkage assembly to move the second door in a synchronous and opposite motion with respect to the motion of the first door.

Abstract: A vending machine includes a storage/display region, a dispensing chamber including a product access opening, and an anti-pilfer device that prevents unauthorized removal of products from the storage/display region through the product access opening. A delivery door is provided which can be shifted from a closed position to an open position to enable the removal of products from the dispensing chamber. The anti-pilfer device includes a plate coupled to a lower portion of the delivery door. When the delivery door is moved from the closed position, the anti-pilfer plate shifts, over a guide element, into a position that prevents products from being withdrawn from the storage/display area. Preferably, the storage/display region and dispensing chamber are separated by a product door, with the anti-pilfer plate preventing the product door from opening when the delivery door is shifted from the closed position.

Abstract: A vehicle liftgate has a counterbalance system comprising a first link pivotally connected to the vehicle body. A second link is pivotally connected to the first link at one end and to the liftgate at the opposite end. The counterbalance system includes a compression spring that is attached to the first link via a pulley. The compression spring stores energy when the liftgate is closed to assist in subsequent opening of the tailgate. The liftgate may be closed manually or with power assistance.

Abstract: A biparting transit vehicle door system operator. The operator includes a base for attachment to the mass transit vehicle and a motive power source connected to a transmission having an output power shaft. Such operator further includes a teeter plate having a shaft engaging portion for engaging the shaft. The shaft has a teeter plate engaging portion for engaging the operator teeter plate. A thrust bearing is in mechanical contact with a hub portion of the teeter plate and a spring is in mechanical contact with the thrust bearing to exert a first axial thrust thereon. The thrust bearing communicating the first axial thrust to the teeter plate so that the shaft engaging portion of the teeter plate engages the teeter plate engaging portion of the shaft. The operator includes a release member having mechanical contact with the hub portion of the teeter plate for exerting a second axial thrust on the teeter plate.

Abstract: An operator for a French casement window having an operating arm with a roller mounted at its end and pivotable to move in an arc between extended and retracted positions, and a channel member horizontally mountable on the inner side of one sash and confining the roller as the operating arm is moved between its extended and retracted positions to move one between open and closed positions, respectively. A bracket is on the inner side of the other sash adjacent its outer vertical side, and a drag link is pivotally connected on one end to the bracket and on the other end to the operating arm to move the other sash between open and closed positions synchronously with the first sash when the operating arm is moved between its extended and retracted positions, respectively.

Abstract: The invention relates to a means for locking an awning/vent type window wherein pear-shaped apertures are provided on the window frame that cooperate with pin means projecting from the vent. As the vent is drawn into a closed position, the pin means enters an enlarged portion of the pear shaped aperture and subsequent relative movement between the pin means and the pear shaped aperture brings about engagement of the pin means with the smallest portion of the pear shaped apertures.

Abstract: A mechanism to control opening/closing of a container door[s] is disclosed. The mechanism is generally located at one end of the container and utilizes a geometric arrangement of opposing fluid actuated cylinders, control members and pivot members to control movement of the doors. A control mechanism allows an operator to selectively open the doors simultaneously or independently. In the preferred embodiment, the control members are rigid members each attached at its top end to a respective door and at its bottom end to a respective pivot member rotatably mounted to the container. Distances between each of the control member bottom ends and a respective one of the rotatable mounts of the respective pivot member to the container for both control members are substantially equal.

Abstract: An access window for use in fast food establishments and other similar drive-thru business establishments is disclosed. The window broadly comprises an elastic operating mechanism, two planar window members and a segmented articulated push-bar operator which is pushed to open the access windows. The push-bar operator can be locked in the open position. Upon releasing and/or unlocking the operator push-bar assembly the access window returns to its closed position by means of a closer bias member. The access window also comprises a locked window bias member which absorbs the pushing action on the operator push-bar, in the event the access window is latched shut, without damaging the access window and further without damaging the operating mechanism.

Abstract: A door operating assembly for opening and closing vehicle doors at a constant door edge force includes a frame. A teeter lever assembly is pivotally mounted on the frame and is connected to a connecting rod assembly connecting the teeter lever assembly and the vehicle doors. A cylinder is mounted on the frame and includes a reciprocally mounted rod. The rod is reciprocated by pressurized air introduced into the cylinder. The rod is connected to the teeter lever assembly to rotate the teeter lever assembly. The teeter lever assembly includes a variable diameter cam. A spring for closing the doors is secured at a first end to the frame and at a second end to a flexible connection member. The flexible connection member connects the spring to the cam and wraps around the outer periphery of the cam upon door opening. The energy stored in the spring at full extension is used to close the doors.

Abstract: A door operator for opening and closing doors on transit vehicles and the like includes an actuator (50) secured to the transit vehicle (10). The actuator houses a worm drive and a reciprocating air cylinder (52) for imparting rectilinear motion to the worm drive. A door shaft (18) is coupled to a door (14) and mechanically coupled to the worm drive such that rectilinear motion of the system is transmitted by the worm drive into rotary motion to the drive shaft to open and close the door. A cam (90) is secured to the vehicle and adjacent to a cam follower (108) that is secured to the door shaft. The cam follower engages the cam during approximately the initial 80% motion during closing of the door and approximately the final 80% of the door opening. A recycling switch (200) for the door may be mounted in the vehicle adjacent to the cam in a position to be engaged upon engagement of the door with an object to recycle the door.

Abstract: A door construction for a vehicle, in particular a railway carriage, comprising a one-leaved or two-leaved door which through the intermediary of one or more brackets, secured to a rotatable, vertical shaft, can be opened or closed by rotating said shaft, and a drive means for rotating said rotatable shaft, which drive means acts through the intermediary of a linkage on a first arm secured to said rotatable shaft, and by means of which the door can be locked in the closed position. In the closed position of the door, the linkage can be locked in a single point according to the overcenter closing principle.

Abstract: A plug door for a vehicle, such as a railway carriage, is carried and driven by a swinging lever which has a sliding fulcrum mechanism the effect of which is to flatten the arc through which the door is carried. The edge of the door which trails in an opening movement is guided either by means of a relatively long pivot arm or by a curved or straight track. The alternative guide means give different trajectories to the leading edge of the door, the long pivot arm guide keeps the door closest to the side of the vehicle during opening. A duplicate swinging lever with sliding fulcrum mechanism as a guide for the trailing edge will move the door parallel to the side of the vehicle and the sliding fulcrums will substantially reduce the outward excursion. By mounting the driving swinging lever over-center, i.e. closer to the trailing edge of the door the plug action is provided for so that a closed door may be flush with the vehicle skin.

Abstract: An emergency release and rotary actuator including a cylinder containing compressed gas or ignitable chemical material, a pressure tube and electrically fired detonation means for releasing the gas into such pressure tube or igniting the chemical material to release the gaseous products of combustion there under pressure into such pressure tube, a piston within such pressure tube, the shaft of which extends outside the pressure tube and carries a lug which engages diverging slots in closely surrounding tubes, all except one of which is rotatable, and a shaft, gear, pulley, or arm attached to one or more of the rotatable concentric tubes. An electrical impulse from a sensing or manual switch causes a detonating force releasing gas or igniting the chemical to drive the piston, the shaft lug of which moves through the diverging slots to rotate at least one rotatable concentric tube to operate a latch, tighten a strap or position a panel or air bag.

Abstract: A Door Control designed especially for a service passage in a quick food establishment or the like, i.e., for serving customers on one side of a passage, say, in a cubicle, by an employee on the other side thereof. Essentially, such control mechanism comprises a device operable by an employee for opening a door or pair of doors normally closing a passage while business may be transacted through the passage such as placing or delivering an order, after which the door or pair of doors is automatically closed. My invention represents an improvement over that disclosed and claimed in my copending application Ser. No. 06/078,095, filed Sept. 24, 1979, now abandoned. In the instant case the doors are so controlled and actuated that, after opening, they are disposed on opposite sides and rearwardly of said passage, not extending substantially forwardly thereof.

Abstract: What is disclosed is a door opener for a bus and the like having a pair of doors pivotally mounted on each side of a door opening on respective door shafts characterized by respective door bell cranks connected with the door shaft so as to effect desired rotation thereof; a central bell crank journalled for pivotal movement for opening the doors; and a pair of respective linking arms connected respectively with the central bell crank and with respective door bell cranks, at least one of the linking arms including respective telescoping members and biasing means for maintaining a noise-abating force on the doors; motor and interconnection mechanism for effecting controlled pivotal rotation of the central bell crank for opening the doors and for closing the doors and a safety override for disengaging the motor to allow the doors to be opened manually in the event of an emergency. Also disclosed is the respective preferred embodiment.

Abstract: Obstacle sensing apparatus for a pivotal door has a drive for operating the door between open and closed positions. Linkage is provided between the pivotal column which supports the door for swinging movement and a platform pivotally mounted on a fixed adjacent structure. When an obstacle is encountered the reactive force pivots the platform through the linkage and activates switches which reverse the drive. Elastic blocks keep the platform centered except when an obstacle is encountered.

Abstract: A stadium cover includes a pair of complemental compartmented canopies which are filled with a gas such as helium and which are moored or anchored by two or more winches to enable selective manipulation of their position. The winches act through cable sets that interconnect the winches with the canopies, and pulley means are provided to furnish several points for mooring and moving forces used in the control of the canopies.