Page 144 - CITS - ED - Mechanical

ENGINEERING DRAWING - CITS

Rag bolt (Fig 3): It is in the shape of a rectangular pyramid with round shank on the tapered end. The corners
are formed into rags or grooved, forming small projections. These are placed in the foundation cavity in position
as above and molten lead or sulphur is poured around it. When the molten lead sulphur/lead solidified, the bolts
are held firmly. The machines are placed in position and nuts are fixed. By melting the lead or burning sulphur
the bolt can be removed.
Lewis Foundation bolt (Fig 4): It is a rectangular shank bolt with one side taper. A gib head key is placed on the
other side of taper as in earlier type and concrete is put around. It is aligned. The foundation bolt can be easily
withdrawn by removing the gib head key first and then the bolt.
Cotter bolt (Fig 5): It has a rectangular slot through which a double headed cotter is placed. A cast iron washer
rests above the cotter. Through a hand hole, connecting the cavity in the concrete the bolt is pulled down and
lifting the cotter, the cotter is placed in position.

Fig 3 Fig 4

Fig 5

131
CITS :Engineering Drawing (Mechanical) - Exercise 8