9001. Hibbard, H. D. May 15. Safes; locks, permutation.-The bodies of the safe and of the door are each cast in one piece of manganese steel, and are then hardened by slow heating to a red heat and rapid cooling. For the heat treatment to be successful, the casting must not be unduly thick, but at the same time it is necessary that the surfaces of contact between the door and safe should be of considerable extent. To provide for this, the door is formed with a flange L on the inner side, as shown in Fig. 2, or with a flange on the outer side, or with both flanges. The safe has an outward swell or flange N and an inward flange 15. The annular groove 6 reduces the metal, which would otherwise be too thick at this part, and also serves as a recess for the bolts G. The edge of the door and the aperture in the body are tapered, as shown, and shoulders 25, 26 are formed on them some distance behind the bolts. The bolts G, Fig. 8, are pivoted by pins 19 to the wheel I operated by the worm M. The worm M is rotated through the bevel-wheels 16, 18 by a handle placed on the spindle P, Fig. 3. The wheel 18 is loose on the worm spindle, and is connected therewith by the clutch W. The clutch W is operated by the bolt of a combination lock Q, so that the worm M cannot be rotated until the combination has been set. The back-plate 7 is attached to the door by screw pins K engaging in blocks L of iron or steel cast into the door, the material from which the door is made being too hard to bore and tap. Should a burglar succeed in inserting explosive into the door and in blowing off the plate 7, the wheel I would be carried away with it, the pins 19 having no heads. The bolts G would then still remain in position with their ends abutting against the flange 9 on the back of the door. The surfaces of the safe and door are fitted by working with emery wheels. The bearing-surfaces for the bolts G are prepared by the same mears, the door being specially shaped to allow these parts to be reached by the emery wheels. The door is supported on a hinge device consisting of a frame C and two hinge-pins D, E. Adjustment is effected by the screw H at the top and the wedge 0 at the bottom. The hinge pin E carries an eccentric wheel F or two wheels, one at each end, which bear against the face of the safe and force the door open when the pin E is turned by the handle V. The door is fully opened by the handle U, the tail end of which limits the extent of its movement around the pin E.