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hinge, joint, hinges, centre, closure, placed and figure

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HINGING, a branch of joinery, which shows the art of hanging a board to the side of an aperture, so as to permit or exclude entrance at pleasure. The board which performs this oflice is called a closure. The placing of hinges depends entirely on the form of the joint, and as the motion of the closure is angular, and performed round a fixed line as an axis, the hinge must be so fixed that the motion may not he interrupted ; thus if the joint contain the surfaces of two cylinders, the convex one in motion upon the edge of the closure, sliding upon the concave one at rest on the fixed body, the motion of the closure must be performed on the axis of the cylinder, which axis must be the centre of the hinges; in this case the joint will be close, whether the aperture be shut or open. But if the joint be a plane surface, it must be considered upon what side of the aperture the motion is to be performed, as the hinge must be placed on the side of the closure where it revolves.

The hinge is made in two parts, movable in any angular direction, one upon the other.

The knuckle of the hinge is a portion contained under a cylindric surface, and is common to both the moving part and the other part at rest ; the cylinders are indented into each other, and made hollow to receive a concentric cylindric pin which passes through the hollow, and connects the moving Ini•ts together.

The axis of the cylindrical pin is called the axis of the hinge.

When two or more hinges are placed upon a closure, the axes of the hinges must be in the same straight line.

The straight line in which the axes of the hinges are placed is called the line of hinges.

The following are examples of the different cases.

The principle of hanging doors, shutters, or flaps, with hinges.

The centre of the hinge is generally put in the middle of the joint, as at A, Fig it re 1 ; hut in many cases there is a necessity for throwing back the flap to a certain distance from the joint ; in order to effect this, suppose the flap, when folded back, were required to be at a certain distance, as A B in Figure 2, from the joint ; divide A n in two equal parts at the point c, which will give the centre of the hinge ; the dotted lines B DE F, show the position when folded back.

.i.Vote.—The centre of the hinge must be placed a small degree beyond the surface of the closure, otherwise it will not 11111 freely back cm the jamb or partition.

It must also be observed, that the centre of the hinge must be on that side that the rebate is on, otherwise it will not open without the joint being constructed in a particular form, as will be afterwards shown.

Figure 3 shows the same thing opened to a right angle. To hang two yaps, so that when folded back, they shall be at a certain distance from each other.

This is easily accomplished by means of hinges having knees projecting to half that distance, as appears from Figure 4; this sort of hinges is used in hanging the doors of pews, in order to clear the moulding of the coping.

To make a rule joint for a window-shutter, or other fuldingjiaps.

Figure 5.—Let A he the place of the joint ; draw A c at right tingles to the flap, shutter, or door; take c, in the line A C, fur the centre of the hinge ; and the plain part A 11, as may he thought necessary ; on e, with a radius, c D, describe the arc a D ; then will A B D be the true joint.

Xote.—The knuckle of the hinge is always placed in the wood, because the farther it is inserted the more of the joint will be covered, when it is opened out to a right angle, as in Figure 6 ; hut if the centre of the hinge were placed the least without the thickness of the wood, it would show an open space, which would be a defect in workmanship.

To form the joints of styles, to be hung together, when the knuckle of the hinge is placed on the contrary side of the rebate.

Figure 7.—Let c be the centre of the hinge, Nt 1 the joint on the same side of the hinge ; xL the depth of the rebate in the middle of the thickness of the st? les, perpendicular to K M, and L F the joint on the other side, parallel to K nI ; bisect x L at it, join n c; on n c describe a semicircle, c 7 n, cutting K at at 1: through the points t and draw cutting F L at c ; then will FGIM be the true joint ; but if the rebate were made in the form of I,t K L F, neither of the styles could move round the joint or hinge.

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