Section 106.—DOORS, MANHOLES AND COVERS.
[1927]. Application of a single crosshead and bolt to close two covers, as in a pump clack-box.
[1928]. Cone seated cover, with hand-lifting crossbar and recess.
[1929]. Crosshead and man- or mud-hole, as commonly used for boilers, &c.
[1930]. Cast-iron manhole and block; T-head bolts are generally used, but also eye-bolts, as in [No. 937].
[1931]. Wrought-iron plate lid, or cover for a tank.
[1932]. Wrought-iron dished cover, with hinged crossbar and T-screw used largely for gas retorts.
[1933]. Furnace door; hinged, with inside plate to protect the door from the heat.
[1934]. Manhole door with water seal, or packed recess to keep back gases, smell, &c.
[1935]. Screwed plug handhole.
[1936]. Wrought-iron boiler manhole cover, and block, a special manufacture.
[1937]. Type of sliding door; can be made airtight by planing the seatings.
Hinged doors are well-known. For hinging, see [Section 50]. For fastenings, see Locking Devices, [Section 49].
See also [Nos. 931], [937], [940], [962].
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