A bollard that supports a door with a top bearing, middle bearing and bottom bearing with the middle and bottom bearing offset from the bollard and a rigid structure molded in the door.

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.

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.

There is provided a door mechanism comprising a door and a door closure mechanism for moving the door between a first, open, position and second, closed position. The door closure mechanism comprises a drive motor coupled to a drive screw, the drive screw having a first, right handed thread portion and a second, left handed thread portion, a first drive nut threadedly engaged with the first thread portion, a second drive nut threadedly engaged with the second thread portion, a first drive linkage pivotally coupled to the first drive nut at one end and to the door at a second, opposed end, and a second drive linkage pivotally coupled to the second drive nut at one end and to the door at a second, opposed end.

A single-hung tilt-to-clean window frame of otherwise standard configuration is furnished with a non-sliding upper sash and a vertically sliding lower sash with each sash having typical tilt-to-clean hardware. When the lower sash is opened and adjusted up/down, insect screen (331) attached to the bottom of the lower sash is dispensed from a self-storing roller unit (330) hidden inside the window sill, automatically filling the ventilation aperture. Thus, vision-restricting screening is out of sight until actually required. Also, the cold wind, muggy air or precipitation that can hinder cleaning operations are blocked by an impervious membrane (334) stretched over the window's opening, before cleaning begins, by way of a handle (343) attached to cables (340) pulling a rod (336) moving a tube (335) placed behind a fold in the membrane.

A bollard that supports a door with a top bearing, middle bearing and bottom bearing with the middle and bottom bearing offset from the bollard and a rigid structure molded in the door.

A garage door carrier system carries an overhead garage door between a closed position blocking entry of a vehicle into a garage, and an open position allowing entry of the vehicle into the garage. The garage door is in rolling engagement with a track that guides the garage door. A lever, rotating about a pivot, has a counterweight at a first end and is rotatably connected to the garage door at a second opposite load end. The counterweight provides in-force at the first end that translates as out-force at the load end as the lever rotates about the pivot to carry the garage door between the closed position and the open position.

A garage door carrier system carries an overhead garage door between a closed position blocking entry of a vehicle into a garage, and an open position allowing entry of the vehicle into the garage. The garage door is in rolling engagement with a track that guides the garage door. A lever, rotating about a pivot, has a counterweight at a first end and is rotatably connected to the garage door at a second opposite load end. The counterweight provides in-force at the first end that translates as out-force at the load end as the lever rotates about the pivot to carry the garage door between the closed position and the open position.

A hinge for a cover of an image forming apparatus has a hinge housing to be movably positioned into an opening in a body of the image forming apparatus, a hinge cam to couple to the cover and to pivotably couple to the hinge housing to support pivoting of the cover.

A hinge for a cover of an image forming apparatus has a hinge housing to be movably positioned into an opening in a body of the image forming apparatus, a hinge cam to couple to the cover and to pivotably couple to the hinge housing to support pivoting of the cover.