Section 50.—HINGES AND JOINTS.

[946]. The common double-leaf hinge.

[947]. Rising hinge, to cause the door to lift slightly as it opens, it will then close of itself without a spring.

[948]. Cup and ball hinge.

[949] & [950]. Pintle hinges.

[951] & [952]. Parchment or leather hinging for wood movements.

[953]. Dovetail joint, used on iron bedsteads, &c.; the circular dovetail is slightly tapered and fitted tight.

[954]. Hinge for a door, required to lay flat against the wall at either side when open.

[955]. Hinge pin for rocking levers on a knife edge.

[956]. Door spring hinge, to return the door always to its central position; the cams press against a roller attached to the springs.

[957]. Another method, with tension springs.

[958]. Rocking bearing or knife edge, used for weighing machines, &c.

[959]. Knuckle joint, halved together; the bolt secures the two parts together.

[960]. Door spring hinge with open springs and toggle movement.

[961]. Gate hinges, with double pintle at bottom to cause the gate to return to the central position without springs.

[962]. Link hinge, for a grid or trap door, to allow it to lie flat when opened.

[963]. Bayonet joint. A common device.

[964]. Double scarfed and joggled joint, for pump, rods, &c., with ferrules and keys to tighten up.

[965]. Universal joint. See Dr. Hooke’s Joint, [Nos. 33 and 34].

[966]. Knuckle jointed levers.

[967]. The common male and female or nipple and socket rod joint.

[968]. Multiple hinges, with one centre bolt, for long or heavy doors.

[969]. Scarfed rod or bar joint.

[970]. Another form of hinge, to effect the same object as [No. 954].