trade to that class of hinge which fixes upon the face ox the door, etc., and that is in two parts —that is, the axis 01 pivot upon which the hinge works is made, and is attached separately to the post or frame, and the band or strap, after securing to the door, is lifted upon the pivot. There are two distinct types—viz. single and double straps, and several varieties of each.
The Hook and Eye Hinge. Figs. 9 and qa, is a common form of single strap hinge used for stable doors, etc., having to swing clear of obstacles at the bottom. It will reverse and the door can be readily lifted off the hook or pivot. Made in wrought-iron in sizes from 18 in. to 36 in., increasing 2 in. The one shown is drilled for bolts, but they can be obtained countersunk for screws.
The "Park Gate" or "Colllnge" Hinge. Figs. 10 and 11, is a typical double strap and spur hinge, used, as the name implies, for large entrance gates to gardens and parks. The hinge shown is the top one, and is for a right-handdiung gate ; the lower hinge has no strap, merely a spur, and may work upon a centre pivot as at top, or, as is more usual, upon two pivots placed side by side about 3 in. apart to throw the gate up as it opens, to clear the rise in the roadway.
Collinge is the name of the inventor. The hinges are to be obtained from 2 ft. to 6 ft. long and to suit any thickness of gate.
The Egg and Cup Hinge Figs. 12 and 13, is a single strap, and is used for coach house and similar "close" doors. The strap is fitted with a ball or egg-shaped bearing, ground to fit a Cup attached to the hanging plate. It ;s also provided with a cover or hood, which protects the bearings from dirt. Different shaped cup-holders are used upon wood, stone and brick piers. Fig. 13 shows the shape for a wood post and Fig. 14 for a stone pier. The one used in brickwork is forked, with the ends turned up and down.
The Cross Garnet, Fig. 15. known also as a T hinge is a common form of strap for light doors and gates. It is made in malleable and wroughtiron in sizes from 6 in. to 24 in. long. The form of joint shown in Fig. 15a is called a water joint.
The Floor Spring Hinge Figs. 17 to 19, is, so far as its hinging property is concerned, merely a pivot hinge, but the lower pivot in this instance is connected to a shoe which carries the door, and to helical spring or springs (according to the make) contained in a metal box concealed in the floor The object of the springs is to cause the door to close automatically. The shoe is usually arranged to swing both ways, and for that reason it is frequently called a swing-door hinge. The sizes vary with different makers, but the dimensions shown are average.
The top or visible plate is of brass, also the shoe, the remaining parts being of steel. As the doors must be fitted into the shoe, then into the opening exactly, the top pivot requires insertion after the door is in position.
The usual arrangement is shown in Fig. 18, where the plate A is fixed into the head of the door ; the plate B into the frame with the lever concealed in its thickness.
When the door is in position, the screw shown on the right hand is turned up, carrying the other end of the level down when the pin enters the socket and fixes the door. With thin or high doors it is necessary to have a hinge in the middle, to prevent their casting ; the usual form is shown in Fig. IQ.
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