USRE51E - Improvement in check-bolts foffjpoor locks or latches - Google Patents

Description

UNITED STATES PATENT OFFICE.

ALBERT BINGHAM, OF BOSTON, MASSACHUSETTS.

IMPROVEMENT IN'CHECvK-BOLTS FOHALDOOR LOCKS OR LATCHES.

Specilication forming part of Letters Patent No. 2y-1Q, dared October 17, 1542; Reissue No. 5l. dated July 8, 1842i.

To all whom, if may concern.:

Beit known that I, ALBERT BINGHAM, of Boston, in the county of Suffolk and State of Massachusetts, have invented certain new and useful Improvements in Door-Locks or Spring- Bolts to be Applied to Doors and other Articles of Furniture; and I do hereby declare that the following specification of the same, taken in connection with the accompanying drawings thereof, forms a full and exact description of my said invention.

Figure 1 of the drawings above mentioned represents a view of the edge of that portion ot' a door on which the lock is usually applied, the same exhibiting the relative positions of my improved lock or spring-bolt and the stationary knobs or handles. Fig. 2 is a representation of a part of the inner side of the door. Fig. 3 is a similar view' of a similar part of the outer side. Fig-4 is a view of the interior ofthe inner knoband key-plates. Fig. 5 is a top view of the spring-bolt and its case as detached from the door; Fig. 6 is an Fig. 7 is an Fig. 8 is a side yelevation of the bolt as removed from its case.

A, Figs. l, 5, 6, 7, is what I denominate the spring-bolt# which is inserted in a suitable mortise formed in the door perpendicular to the edge thereof, and is confined in its requisite position by screws a. a, Fig. 1, passing through the face-plate b of the bolt-case B. This latch-bolt is pressed forward by means of a helical or other suitable spring, c, the front end of which bears against a shoulder, d, Fig. 8, of the bolt, while its rear end rests or abuts against a shoulder, e, Fig. 5, ofthe external case, B. Whenever thebolt is retracted, the distance through which it recedes is regulated by a stop or shoulder. f, Fig. 5, suitably formed on the boltcase, the shoulder d of the bolt being brought in contact with the said stop. The front end of the bolt, or that part thereof which projects beyond the face-plate, is beveled down, or formed angular, in a similar manner to spring-bolts in general, and when the door is closed this end of the bolt enters into the usual mortise or cavity formed in the door-case. The rear end or" the l bolt has a thumb or nger rod, C, passed a suitable distance-beyond the sides of the door and by the sides ofthe stationary knobs D E, as seen in`Fig. 1'. A suitable horizontal slot is formed through the door and in each knob-plate for the thumb-rod to move in, the

form of this slot being represented at g, Fig.`

4, and' by dotted lines in Figs. 2 and 3. The position of the spring-bolt and its case is also shown by dotted lines in Fig. 2. Both doorknobs are fixed or made stationary in their respective situations-that is to say, their sockets h t' are lirmly attached to circular plates k Z, as seen in Fig. l, these plates being conned to the door by screws m m m, Figs. 2,

3. The circular plate of the inner knob,V D, has a ange, n o p, Fig. 4, and o, Fig. 1, y

fulcruni, u, and has an arm, t, projecting fromY its side and its'top q, formed angular and resting and operating against one end of aspring, o, as seens in the drawings. A small knob orlhandle, w, extends from the opposite side of the bolt F, the same playing, when the bolt is moved to and fro, in aslot, x, formed through the upper part of the key-plate G. This keyplate is suitably arranged with one or more wards, y, to receive and sustain the key H, which is inserted into the same from a keyholeformed through the door from its oppolsite side. When the key is turned upward,l

but when the armt is depressed below the rod C the spring-bolt can be freely moved to and fro.

It hasbeen shown thatboth of the glass .vantages over others in common use.

spring-bolt.

knobs D E are immovable, while thev spring spring, so that the force required to throw it and check bolts are movable and are opera- When the inner-knob.

ted by other means. is grasped by the hand, it serves not only -to give a person a command over the door requisite to move it upon its hinges, but also as a fulcrum for the thumb to rest against while the forelinger presses back the spring bolt, and for the hand when the check bolt is 0perated by means of the small knob w. When the outer knob is taken hold of by the hand, the spring-bolt maybe retracted by the thumb acting against its rod C. Such knobs and fastenings applied to doors possess many ad- The immobility ofthe knobs prevents the difficulty so often experienced in other knobsviz., that of the knob working loose vin its socket by reason of the torsion strain to which it is generally subjected in order to move the Besides, the above arrangement of the knobs requires but very little cutting away of the door invorder to tit them. The springbolt not being required to overcome the friction of movable knobs, tumblers, and other parts usually connected therewith, may be operated by a very gentle and sensitive back whenever the door is closed may be eX- tremely light in comparison to that which is generally necessary. Here one bolt answers the double purpose of lock and latch, and the simplicity of the parts, and consequent diminution of friction in their operations, renders them very durable and not likely to get out of repair.

Having ,thus set forth my invention and the principles thereof by which it may be dis tinguished from others of like character, I shall now proceed toypoint out'what I claim therein.

The combination of the stationary knob with a cheek bolt moved by a key or knob, as described, the whole being arranged and operating substantially in the manner and for the purposes hereinbefore explained.

In testimony that the foregoing is a true description of my said invention and improvements I have hereto set my signature this'th day ot' March, in the year 1843.

ALBERT -BINGHAM- Vitnesses:

R. H. EDDY,` EZRA LINcoLN,-J r.

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