This section is from the book "A Treatise On Architecture And Building Construction Vol3: Stair Building, Ornamental Ironwork, Roofing, Sheet-Metal Work, Electric-Light Wiring And Bellwork", by The Colliery Engineer Co.. Also available from Amazon: A Treatise On Architecture And Building Construction.
37. All the preceding examples of grille-work are suitable for use in elevator enclosures or any similar screen work, and their application to such work will now be considered. In Fig. 50 is shown an example of grille-work front for an elevator shaft. The shaft is formed by the main wall of the building in the rear, and fireproof partitions on the sides, the front only being of grille-work. An angle iron or a channel is usually set across the front of the well at each floor, as shown at a, Fig. 56 (c), the top of which is generally 4 inches below the level of the finished floor of the story above, although the location of these beams, being a matter that is determined in connection with the general structural framework of the building, varies materially in different structures. The enclosure work must, of course, be made to suit the positions of these beams on which it is supported, and the important point is their relation to the finished floor level. In fact, the principal measurements necessary to lay out the work are the width between the partitions, the distance from the finished floor to the top of the beams, the depth of the beams, and the height from floor to floor (which will generally be the same as from beam to beam). Having these points determined, the position of the cast-iron jambs shown at b in the plan (a) should be fixed. In this example the whole opening is surrounded with a cast-iron architrave c consisting of the jambs shown at b in the plan, over which is set the cornice d, standing independent and distinct from the partition. The jambs rest on top of the steel channel shown at e in the section (c), and are bolted to it at the bottom; while the top is run up and bolted to the bottom of the channel a, as the partition itself affords no support. The upper portion of the jamb is checked back from the point where the architrave is mitered, to the bottom of the beam above, in order to permit the cornice to pass in front of it, and to permit it to be enclosed in the partition. The top connections may be made by riveting to the head of the jamb a short piece of angle iron, to project each side of the jamb, as shown at (d); or, the top of the jamb may be cast with a flange or lug about 1/2 inch down from the top, as shown at (e). The half-inch clearance permits the jamb to be shortened a trifle if necessary, when fitted to its position.
The jambs being set perfectly plumb, the sill f is then put down, and, as will be seen in the section (c), the edge next to the floor is turned down about 1 1/2 inches, to form a flat surface for the woodwork to finish against. The angular grooves shown at k in the large detail of the sill, Fig. 57 (a), give a better foothold than if the surface were smooth; the deep groove a in the same detail is for the bottom guide of the sliding door to travel in, and is made ample in width, and closed in on each side with a strip of wrought iron b, to permit of adjustment in case the cast sill is not set true. The wrought-iron plates are also advantageous, inasmuch as they serve better to keep the door in its proper place and reduce the friction surface to the narrow edges of the strips only. As the side of the sill next the shaft is not deep enough to reach to the beam, upright ribs c are cast about 3 feet apart along the under side; and on one side of each of these ribs is riveted a piece of angle iron d, which is bolted to the beam. The cornice is a hollow casting, as shown at (b). It is open at the ends where the extensions of the side jambs pass behind it, and it is mitered at the corners where it joins and is bolted to the jambs and architrave with countersunk screw bolts. The cornice is secured to a bar with screw bolts, as shown at l, and the bar in turn is bolted at each end to the jamb.
38. In Fig. 58 is shown a plan and horizontal section of the front of the enclosure. The strap brackets a are of 2"x2" angle iron, and are so placed as to brace the opening laterally. They are bolted to the structural column with expansion bolts, and to the architrave with countersunk screw bolts. The webs b of the architrave are sufficiently thick to provide the tap or screw bolts securing the door stop a firm and sufficient hold. These stops are fitted with a rubber cushion c, which takes up the recoil and noise of the door when operated.
By referring to the elevation (b), Fig. 56, it will be observed that the grille-work is divided into two large panels, one being the door g, and the other a pivoted panel h. The frame of the door is composed of angle irons, as shown at d, Fig. 58, and the frame of the pivoted panel of flat bars, as shown at e. The pivots are secured to these bars with screw bolts, as shown at f in Fig. 57. On the sliding door is a bar shown at f, Fig. 58, to which the door is hinged. The bottom of this bar carries a guide, fitting in the groove of the track, and at the top secured to the angle iron g, Fig 57, which is a slight extension of the door frame. The door is held in place by the guide bolt i, and the panel by sliding bolts. The reason for this arrangement is to facilitate and make possible the entrance to the elevator of large pieces of furniture; in such a case, the whole front may be swung open by first drawing the sliding bolts in the pivoted panel, then drawing the guide bolts and pushing back the sliding door to its full extent Both sections are then swung open, the bar and the angle iron remaining attached to the hinges. When used under ordinary conditions, the sliding door is held in place and firmly attached to the hanger by the clips shown dotted at h.
39. The hanger consists primarily of a pair of wheels running on a track, from which the door is suspended. These wheels are both alike and are set about 12 inches from each end of the door, the position varying somewhat in different doors. Fig. 59 shows the principal features of this hanger, which is patented. The track a shown in the section (b), on which the wheels run, is fixed to the back of the transom at each end by cast-iron supporters b, shown in detail in Fig. 00, which should be set perfectly level. The track, with the wheels on it, is then put in position, and the bolts b' are loosely screwed through the slotted holes in the end. If it is found necessary to further adjust the track, the screws c are for that purpose, so that it can be easily set level; then the bolts b' are to be screwed up tight. On the arrangement of the sides which enclose the wheels depends the easy gliding motion. These sides e, Fig. 59, are punched out of solid steel. At the lower end there is a V-shaped hole f and across the center is a slot g reinforced by a steel strap h in which the axle of the wheel travels and revolves. The slot is an arc of a circle whose center is the lower angle of the V-shaped hole, and the door is suspended from the knife-edge bearings i resting in this V. When the door is at rest the wheel is in the position shown by the full lines, and as it is pushed along the sheaves gradually swing over to the position shown by the dotted lines, the center of the wheel always remaining over the point of suspension. This prevents any rubbing motion at any point, as the axle of the wheel is not bound in any way, but simply rolls in the slot, and it is evident that the friction at the point from which the door hangs is practically nothing. If it is found necessary to raise or lower the door itself, this may be done, after everything is in position, by turning the suspending bolts c, which are squared at the neck to afford a hold for a key or wrench.