US19879A - of baltimore - Google Patents

Description

E. M. SHAW, OF BALTIMORE, MARYLAND.

LOCK. Y

Specification of Letters Patent No. 19,879, dated April 6, 1858.

To all whom it may concern:

Be it known that I, ERASMUS M. SHAw, of Baltimore, in the State of Maryland, have invented a new and Improved Lock; and I do hereby declare that the following is a full, clear7 and eXact description of the construction and operation of the saine, reference being had to the annexed drawings, making a part of this specification, in which- Figure l is a perspective view of the lock complete. Fig. 2 is a back elevation of the lock with the cover or boX plate removed. Fig. 3 is a back elevation of the lock with the plate (fw) removed. Fig. 4 is a vertical section through the center of the lock.77 Fig. 5, is an edge. or end elevation of the lock with the cover (fw) removed. Fig. 6 is a horizontal section of the lock without the cover w). The same letters of reference in the different figures denote the same parts of the lock. Fig. 7 is a side view of the key and Fig. 8 is a longitudinal and Fig. 9, is a cross section of the key.

(A, A, A)- is the main plate of the lock on to which are permanently fastened the small plates (b, b) pin (a) and spring which is bent in a form so as inclose between its arms the lower portions of the bolts (d, (l) which vibrate on pins (e, e)-which pins are fastened t0 the plate II is the hole in top portion of theplate (A) through which hole the notched stem (S) passes.

The Lipper portionsof the bolts (d, cZ,) are beveled or tapered so as to form a V space or wedge shaped-space between them when they are brought to the positions in which they are represented in the drawings. The bolts (d, d) are notched at (d cZ) for the reception of the wings of the lower portion of the stein They are also notched at (d2, cl2) for the purpose of allowing the bolts (CZ, CZ,) to be brought to a vertical position by the spring (c) before they Strike the pin (a) which serves as a stop for both the bolts (d, d) against which each of the bolts (d, d) is pressed by the spring (c) when they are not acted upon by the key.

(i, it) are holes in the bolts (d, c,) for the reception of pins (m, m) which are fastened on the narrow spring plates (p, p) the lower ends of which spring plates are at-v tached to the plate (r) which has a hollow stem (t) projecting from it which is the guide for the key. Portions of the plate (1") are turned in or bent at right angles to its main body so as to form flanges which lit against the plates b, b). are slots or mortises into which slots the screws (e, e) project or pass the screws being screwed iirm and tight in the plates b) while their points or ends work loosely in the slots (ow) of the flanges of the plate (r). These slots and screws are for the purpose of allowing a certain play or motion of the plate in a vertical direction so that the pins on the plate (r) can be brought opposite the holes (it, h) in the bolts or the hollow stein (Q) brought oppo' site the cavity or hollow formed by the In these flanges l rounded notches in the edges of the/bolts (CZ, This cavity is marked Fig. 10 is a side or edge view of the plate (r) and hollow stem (g) which is perinanently attached to it. (p, 79) are the spring plates attached to the plate (r) at their lower portions and having attached to them at the upper portions the pins which are shown in dotted lines. The cover or box plate (fw) is secured to the main plate (A) by four screws passing through slots in flanges on the cover and entering and screwing into lthe plate (A). The slots in the flanges (w) on the cover (w) are for -the purpose of allowing the cover (fw) to be moved in a vertical direction by the key when the key is moved upward or downward as occasion may require.

Figs. 7 8 and 9 of the key show how the end or working part is formed into feet or wedges with their apices outward from the body of the key. is a stem pointed at one end and having a small knob or handle at the other for the purpose of forcing it in and out of the hollow body of the key. That portion of the body of the key which is toward the feet or wedges (Z, 2,) is hollowed suiciently large forthe reception of the stem (g) which is on the plate (r) the other portion of the stein or body of the key is only hollowed large enough for the stem (7u) to pass through. The form of the double hooked, winged or barbed stem which is a counterpart for the upper parts of the bolts (d, al) before described is suiiiciently plain by inspection of the drawings without further description.

The operation of the lock is thus (I will take an instance where the lock is on a trunk). The lock being on the body of the trunk and the Stem (s) fastened to the iid of the trunk by means of the plate (S) and screws, the plate (S) being permanently fastened to the stem. Supposing the lock with regards to its parts to be in the position shown in the drawings and it is required to shut the trunk. The key must be put in the key hole (y) and on the stem (g) of the plate (r) and pressed into the lock till the end of the key strikes the plate The key is then to be turned one quarter of a revolution aboutits axis by which motion the ends of the feet or wedges on the key will be inserted between the beveled edges of the plates (29, 10) and the plate (r) by which operation the plates (p, p) are sepa rated at their upper portions from the plate (fr) and the pins (m) on the plates (p, 79) are consequently drawn out of the holes (7L, 7L) in the bolts (el, cl) when the key is to be moved downward till the screws (e, z) prevent the further descent of the plate (fr) then the stem of the key being opposite the cavity formed in the edges of the bolts (fl, (Z) is pushed in between them and separates them so as to allow the stem on the lid of the trunk to be inserted between them. Then the key is to be raised to its former position and turned back a quarter of a revolution about its aXis and withdrawn. The trunk is then locked and to unlock it the key must be inserted as before, turned a quarter of a revolution about its axis,V then pressed downward as far as it is allowed to go and the stem pressed in which will separate the bolts as before described and allow the stern on the lid of trunk to be withdrawn. The key may then be left in the lock till itis required to lock .it again or it may be withdrawn by-raising it (after the stem (7c) has been drawn out from between the bolt-s (cl, d)) as far as it is allowed to go, then turning the keyA a quarter of a revolution about its axis back to its original position and pulling it out of the lock. It must be observed that the stem (S) cannot enter its place between the bolts (0l, CZ) except by opening or separating the bolts as before described. The cover or box plate is moved upward or downward by the key when the key is moved. It may be remarked that the bolts cannot be separated till the plate (1') is moved downward so as to cover a narrower portion of the bolts than it does when it is up as far as it can be moved for when in that position it fits close to the bolts and prevents their separation. (B) is the hole in the plate (A) for the stem (S) to pass through.

What I claim as my invention and desire to secure by Letters Patent is- The plate (r), spring plates (19, p) pins (fw) and hollow stem (g) combined as herein described.

I ERASMUS' M. SHAW. Witnesses l THos. B. BARNARD, NEVILLE JOHNSON.

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