US 241998 A
Description (OCR text may contain errors)
W. H. KING.
Patented May 24, 1881..l
UNITED STATES PATENT OFFICE.
W. HASKELL KING, OF ATEIOL, MASSACHUSETTS.
B O LT SPECIFICATION forming part of Lettere Patent No. 241,998, desea Mey 24, 1881.
Application filed April 6,1881.
To all whom fitmay concern:
Be it known that I, W. HASKELL KING, a citizen of the United States, residing at Athol, in the county of Worcester and State of Massachusetts, have invented new and useful Imprcvem ents in Door-Bolts, of which the following is a specification.
The object of my invention is to simplify the construction of mortise door-bolts, to render them stron g and durable, and to lock the bolt in its positions of projection and retraction, so that it cannot be moved therefrom except by the use of a suitable key.
y In the accompanying drawings, Figure l is a view, in elevation,of myimproved door-bolt. Fig. 2 is a similar view, the front portion of the case being removed andthe boltprojected. Fig. 3 is a longitudinal section on the line w x of Fig. 1. Fig. 4 is an edge view of the crankdog detached. Fig. 5 is a view ofthe key and escutcheon.
The letter A denotes the case, made of two semi-cylindrical parts,o and a,the part a having secured to its front end an annular vfaceplate, aZ, behind which the front end of the'part c sets.
B designates the cylindrical holt, resting in the part a, and adapted to play longitudinally in the case. The rearportion,B/,of the boltis cut away on one side to about half the thickness of the front part, forming a flat front face, across and near therear end of which is formed a straight groove, b. Through the boltis formed parts of the case are placed together the hub d' of the crank-arm enters a correspondinglyshaped aperture-or hearing, d2, form ed through the wallet part c of said casing, so that a suitable key may he inserted in the socket di of the huh, which socket maybe squared, as shown,
or otherwise formed to embrace a corresponding' key and prevent said key from turning without also turning the hub. The socket is preferably closed at its inner end, and thus dust will be prevented from entering the case, as the hub and holt will fit snugly in their bearings. The center of the hub, in its bearing, stands above the center line of the casing and bolt, andthe crank-arm is of such length that it can perform a'little more than a half-revolution in the direction of the arrows, Fig. 2, and its crank-pin strikes the wall of the casing immediately after it rises above the centerline in its movement in both directions.
When the parts are secured in position, as shown in Fig. l, a key say,such as is shown in Fig. -has its squared tip inserted in the hub d', and by turning said key forward the crank-arm is thrown forward to the limit of its movement-thatis, with its crank-pin against the upper part of the casing and a little above its own dead-center line. This movement of the crank throws the bolt out, of course, the crank-pin playing in groove b. The crank-arm in this position acts asa dog to prevent theretraction of the bolt except by the turning of the key in the opposite direction, for it is obvious that any rearward pressure upon the bolt would tend only to revolve the crank in the same direction it followed in throwing the bolt out; but in this direction it cannot move farther, because its pin d is stopped by the wall of the case. By turning the key rearward the holt is retracted and the crank-arm carried to its rearward limit, as shown'in dotted lines, Fig. Z-that is, to a position the reverse of that shown in full lines-and its pin stopped by the upper wall of the case.
I have shown, simply for greater security, the crank-arm as making a little more than a half -revolution and rising a little above its dead-center line in projecting the bolt; but it is obvious that it' it were stopped directly upon its dead-center line, which coincides with the center line of the bolt, the bolt could not be pushed in or otherwise retracted than by akey. I do not, therefore, confine myself to moving the crank above its dead-center.
To give steadiness and smoothness of Inotion to the bolt, and to obviate rattling when the bolt is used on the door of vehicles,a bowspring, f,is arranged behindv the bolt, between it and the wall ot' the case, and presses the bolt forward snugly to `its bearings.
I am aware that cranks have been used to operate bolts, and I do not, broadly, claim the combination ot a crank and bolt operated thereby.
What I claim isl. Amortise door-boltcoinbinin g in its structure an inelosing-casin g, a sliding boltarranged therein, and provided at or near its rear end with a groove extending transversely across the bolt, and the crank-arm constructed to receive a key, and having a crank-pin arranged to playin the transverse groove across the bolt, and to make not less than ahalf-revolution between two points on opposite sides of its axis, and stops to limit the movement or" the crankpiu in both directions, substantially as described, whereby the crank serves both to operate and to dog the bolt, as setl forth.
2. A mortise door-bolt combining in its structure the inclosing-casing, the sliding bolt arranged therein, and having at or near its rear end a groove extending transversely across the bolt, and the crank-arm having on one side a crank-pin arranged to playin the groove across the bolt, and on its other side a hub passing 3o through a bearin gin the wall ofthe casing, and provided with a socket to receive a key, substantially as described.
In testimony whereofI have hereunto set my hand in the presence of two subscribing witnesses.
W. HASKELL KING.
JAMES L. NoRRIs, J. A. RUTHERFORD.