This section is from the "Architectural Iron And Steel, And Its Application In The Construction Of Buildings" book, by WM. H. Birkmire.. Also see Amazon: Architectural Iron And Steel, And Its Application In The Construction Of Buildings.
The enclosure front represented in the annexed engraving is not a design of any particular merit, but is given here to illustrate the combination and construction.
The transom rail over the doors is made of a wrought-iron angle (I) and faced with a cast-iron moulding. A smaller wrought-iron angle (F) is secured on the larger, with one leg planed to serve as a track for the sheaves of sliding door, and extends across the entire front. The sheaves are anti-friction and arranged into a hanger or welded bar, formed with an open groove as shown at H; the pin in the sheave runs back and forth, travelling the full length each time the door is opened or shut.
The hangers are secured to top of door as shown in section of track.
The bottom of door is prevented from falling out by the pin A projecting into the grooved saddle.
The saddle extends across the entire front and down over the channel on inside of enclosure as shown at B.
To give a neat appearance to the face of channel, rosettes (E) or mouldings are generally employed. The moulding C is made to extend below ceiling to receive the plastering.
These fronts are often used as entrance doors to shafts where it is desired to carry goods from one story to another, some passenger elevators having an auxiliary compartment for freight. The entire front is hung on heavy pin hinges, in such a manner that when the sliding door is back of the stationary panel, and bolts loosened from end of transom, the front may be swung out.
The doors of front should be set plumb over each other in the different stories, as the door in elevator car takes the same position at each story as it rises and falls.
Of the many methods of constructing an enclosure for elevators, that of the angle-iron frame requires the least room and is the simplest in erection. The frame is filled in with porous terra-cotta blocks 4 inches thick. The corner angles, of 3" X 4" X 3/8", extend to the lower floor level, resting on a base plate of cast iron, a small foundation being prepared for the same. If the stories are not too high, a connection need only be made at every other story. For these connections wrought-iron plates 1/4 inch to 3/8 inch thick are used. (See connection C. For connection above roof where upright angles discontinue, see connection B, G.) At each floor level a horizontal angle is placed which receives the uprights of door and also the cast-iron saddle. The uprights or jambs should be 3" X 3" X 3/8" angle, with 3" X 4" X3/8" at head: the head angle to have the 4-inch leg down to receive the 4-inch block. The distance between head of door and the next story will require a good-sized panel of terra-cotta blocks; therefore a larger angle is needed.
The connections of door jambs should have counter-sunk bolt heads on door side as shown at detail D, that door opening may be perfectly free.
To prepare the jambs for the door a wrought-iron eye is riveted as shown in plan, with proper projection for the wooden casing. The pin or strap hinge is secured to door and works in this eye. To stiffen the jambs and prevent any vibration caused by the continual closing and swinging of doors, a flat bar 2 1/2" X 1/2" is placed between jamb and corner angle, half way in height (see connection E) The doors are made of wood and covered with sheet iron No. 16 to No. 20 gauge. The strength of the angles to support the superstructure need not be taken into consideration: those adopted will be found sufficiently strong for the requirements. Angles of 3" X 4" were selected for practical reasons; the fire-proof blocks being 4 inches thick, a 4-inch angle is required.
By reference to side elevation it will be seen that an angle extends vertically against wall. The terra-cotta blocks require side supports on each story at that point; out these are frequently omitted when the mason leaves vertical openings, the width of terra-cotta blocks by 18 inches in height, every 4 or 5 feet apart in the height of enclosure.
The cross-pieces on side elevation extend into and bear on the wall, to carry each panel as shown.
Most if not all enclosures extend several feet above the roof, with a large skylight for ventilation and light. Although the car seldom extends to roof, the sheaves for the gearing of car should extend above the roof line to give ample height for the proper working of the car at top story.
The sides of the enclosure above the roof should be covered with crimped or plain sheet iron No. 16 gauge.
When the iron frame of enclosure extends above level of roof it is called-a bulkhead. Similar bulkheads are placed over stairs, dumb-waiters, and light-shafts.